WO2018039874A1 - Device for protecting thread of petroleum pipe - Google Patents

Abstract

A device for protecting a thread of a petroleum pipe is provided with an arc-shaped surface attached to a pipe member to be protected, and comprises a radially-centered seal portion (3) and a main body portion (1) surrounding the seal portion (3). The main body portion (1) radially comprises a side wall portion (1-1) and a push-against portion (1-2) that are adjacent and separated by an extension of the arc-shaped surface. The side wall portion (1-1) comprises the arc-shaped surface; and the push-against portion (1-2) is disposed in a radial cantilever manner on the same side where the arc-shaped surface of the side wall portion (1-1) is located. The device can overcome defects in the prior art, has a simple structure, is convenient to prepare, has low cost and a light weight, has a good protection effect on an external thread of an end portion and the opening of the end portion, and has far greater strength than that in the technical solution in the prior art under the condition of the same weight and the same manufacturing cost.

Description

Oil pipe thread protection device Technical field

The invention relates to the field of end thread protection devices for petroleum pipelines, in particular to a petroleum pipe thread protection device.

Background technique

The oil pipeline will process the internal thread at the end of the pipe according to the needs. According to the position of the thread processing, the end part of the oil pipeline is the male end and the female end. In the process of oil pipeline transportation, the thread tends to be impacted. It is deformed by extrusion, which makes it difficult to dock the pipe in actual use, and even if it is barely connected, there is a problem that the sealing property is deteriorated, which seriously affects the normal use of the pipe. In order to avoid the difficulty of docking during the actual use of the pipe due to the threading and end damage of the pipe, it is necessary to protect the thread of the pipe and the port of the pipe. In the prior art, a protective device is usually disposed at the end of the pipe, and the protective device prevents the thread deformation of the pipe end and the pipe port from being damaged. The structure adopted in the prior art has an excessive weight under the premise of meeting the protection requirements. The problems of excessive cost and large volume make the transportation cost and its own manufacturing cost too high.

At present, the mainstream protection device on the market adopts an outer steel inner plastic structure, that is, an outer steel sleeve structure is added on the basis of the plastic structure, as shown in FIG. 16 and FIG. Patent No. CN201020512717 and CN201110163331 are two kinds of protection structures for the outer end of the outer steel and the female end of the outer steel. The design comprises a steel shell and a threaded tubular plastic layer, the shape of the thread is engaged with the protected thread, and the steel sleeve is partially recessed by a small impact port on the steel sleeve between the steel sleeve and the plastic layer. Plastic fitting. With this structure, the length of the steel sleeve is basically the same as that of the plastic. The advantage of this structural design is that the steel sleeve provides the most important structural strength and withstands external impacts; the plastic provides flexibility to prevent impact damage to the steel pipe threads. However, in order to manufacture such a protective device, a large amount of material is required, requiring both steel and plastic. And if material recovery is required, it is necessary to separate the steel sleeve and the plastic, and it is necessary to provide a lot of labor processing costs. Therefore, on the basis of the outer steel plastic protection ring, there is another plastic protection ring on the market, that is, the whole structure is made of flexible materials such as plastic, as shown in patents CN201020049858 and CN200320125773. It generally has a threaded guard segment that engages the thread of the steel tube and a tip end structure for providing a cushioning. Compared with the outer steel inner plastic protector, the strength of the whole plastic structure is reduced under the same size. Therefore, in order to pass the test standard of the petroleum industry pipe thread protector specified by API 5CT, it is necessary to strengthen the plastic structure. To increase the corresponding size. Patent CN99809095 provides a good example of local optimization of the all-plastic structure. The patent greatly improves the height and cross-sectional area of the top cushioning structure on the basis of ensuring sufficient strength of the threaded meshing portion, thereby effectively improving the overall efficiency. The impact strength of the plastic protector. The invention is further improved under the design idea of the patent CN99809095, and the structure of the end buffer portion is optimized through mechanical analysis, so that better mechanical dispersion performance can be achieved under the impact of the top end of the protector. At the same time, saving manufacturing materials.

Summary of the invention

In view of the deficiencies of the prior art, the present invention provides a petroleum pipe thread protection device, which can overcome the prior art The insufficiency of the technique is simple in structure, convenient in manufacture, low in cost, light in weight, good in shielding effect on the external thread and the port of the end, and the strength of the invention is much greater than the existing technology in the case of the same weight and manufacturing cost. Program.

The technical solution of the present invention is to provide a petroleum pipe thread protection device having an arcuate surface that fits a pipe member to be protected, comprising a radially centered sealing portion and a body portion surrounding the sealing portion, the body The portion includes adjacent sidewall portions and abutting portions defined by the curved surface extension in a radial direction, the side wall portion including the curved surface, and the abutting portion is radially cantilevered on the side a side of the wall that is the same as the curved surface;

The center portions of the side walls, the abutting portion, and the radial portion of the sealing portion coincide;

The main body portion 1 includes a connecting portion and a protective portion in the axial direction;

The sidewall portion extends to the connecting portion, the axial dimension of the sealing portion 2 is smaller than the axial dimension of the abutting portion, and the axial dimension of the abutting portion is less than or equal to the protective segment;

The side wall portion, the abutting portion and the sealing portion have a flush top plane.

Thereby, the respective portions constituting the main body portion include the side wall portion of the radially constituting member, the abutting portion, the connecting portion of the sealing portion and the axially constituting member, and the protective portion are all fixed by one injection molding, and simultaneously The invention further ensures that the planes of the side wall portion, the abutting portion and the sealing portion at the end portion of the sealing portion coincide with each other on the basis of the above structure, so that the end portion plane of the main body portion 1 constitutes a continuous and large area. The force receiving surface, when the invention receives the impact, the plane can disperse the impact force to the maximum extent in the first time, wherein the connecting section is used to connect the pipe port while protecting the connecting structure of the pipe material, such as the thread structure.

At the same time, the connecting section and the protective section are in use, because they are in a fixed relationship, so that they are structurally strong and can transmit impact force to each other, so that the present impact of the impact force is faster, and the effective impact actually received by the pipe port is reduced; The connecting section is threadedly connected to the pipe so that the thread of the pipe can be effectively protected; the Applicant has also found that when the planes of the side wall portion, the abutting portion and the end portion of the sealing portion on the side of the protection portion coincide, the first time can be maximized. Dispersing the impact force, which causes a hollow structure to be formed in the protection section due to the position of the sealing portion being raised relative to the prior art, and the hollow structure is only required to fit the end of the planar structure to actually receive the maximum axial force. The limit can be almost the same as the solid structure, and the production cost can be drastically reduced.

As a preferred aspect of the present invention, a side of the side wall portion extending to the connecting portion is provided with a threaded structure for connecting and protecting a steel pipe thread, and the threaded structure and the abutting portion are disposed on the side wall The same side of the department.

Therefore, in a plurality of connection manners, the present invention particularly preferably provides that the threaded structure is provided for the purpose of protecting the pipe end thread, since the convex portion of the pipe end thread itself is very weak, and if the pipe end thread is deformed when subjected to an impact, The pitch will be changed. This deformation makes the connection of the pipe in actual use very difficult, and the threaded structure of the connecting section and the pipe end thread are well protected against the pipe end thread, and the thread is subjected to the impact process. The impact force is transmitted from the threaded structure of the connecting section to the main body portion for dispersion, so that the damage of the thread is also minimized.

In a preferred aspect of the invention, the abutting portion is provided inside the side wall portion, and the sealing portion is provided inside the abutting portion.

Thus, the protective structure is defined for the male end structure of the threaded peripheral.

Preferably, in the present invention, the abutting portion is provided outside the side wall portion, and the sealing portion is provided inside the side wall portion.

Thereby, the protective structure is defined for fitting the female end structure provided in the thread.

As a preferred aspect of the present invention, the end portion of the protection section is provided with a tool engagement structure recessed toward the connecting section.

Therefore, the tool mating structure is mainly used for quickly disassembling the present invention with a special tool, and the present invention is configured to match the side wall portion, the abutting portion and the plane of the sealing portion at the end portion of the protecting portion. The normal function of the function is preferably a concave forming method to set the tool fitting structure. If other methods are used to realize the tool fitting structure, such as a convex type, the force diffusion is uneven when subjected to an impact, resulting in a convex type tool. The joint between the mating structure and the main body portion is excessively stressed, causing the joint to break.

As a preferred aspect of the invention, the tool engagement structure has a depressed depth that is less than the axial length of the abutting portion.

Therefore, since the tool mating structure is depressed, the impact force acts on the port of the tool mating structure to cause deformation of the structure, and the closed bottom structure of the tool mating structure can play a certain offset effect, and this offset effect The magnitude of the force is determined by the sag depth of the tool mating structure, so this depth is preferred.

As a preferred aspect of the invention, the tool engagement structure has a depression depth that is less than 2/3 of the axial length of the abutment portion.

Thus, it is concluded by the applicant's extensive theoretical calculation that it is best to control the maximum extent of the sag depth below this value.

As a preferred aspect of the present invention, the protection section includes a first portion, a second portion, and a third portion that are sequentially disposed in an axial direction, and a side of the first portion is curved, and the second portion is The radial cross-sectional area is incremental or constant from the first portion toward the third portion, and the third portion is coupled to the connecting portion.

Therefore, different parts of the protection section are specially set for the purpose, wherein the side of the first part is arranged in an arc shape, which is very beneficial for the demolding of the mold, and can also exert a certain force guiding effect. The second and third portions can lengthen the conduction length of the force to further slow the force acting directly on the tube end.

As a preferred embodiment of the present invention, the tool mating structure includes a fixing hole, and the fixing hole is symmetrically disposed on both sides of the diameter of the end surface of the protection section.

In a preferred embodiment of the present invention, the tool cooperates with the structural package fixing groove, and the end faces of the protection segments are parallel in diameter and pass through the fixing grooves.

As a preferred embodiment of the present invention, the tool mating structure includes a fixing hole and a fixing groove, and the diameter of the end surface of the protection section Parallelly and through the fixing groove, the fixing holes are symmetrically disposed on both sides of the fixing groove.

As a preferred aspect of the invention, at least one side of the side wall of the tool mating structure is coupled to the side wall of the guard segment.

As a result, the tool mating structure is more stable when the tool is engaged.

As a preferred aspect of the invention, the tool mating structure includes a cross counterbore.

Therefore, the tool fitting structure can correspond to the hook type lifting method, and the depth of the cross counterbore is determined according to the size of the hook, and the setting makes the application surface of the invention more extensive.

As a preferred aspect of the invention, the thickness of the first portion and the second portion is less than the axial length of the abutting portion and greater than the depth of the tool mating structure.

As a preferred aspect of the invention, the axial length of the closure portion is greater than or equal to the thickness of the first portion and less than or equal to the depth of the tool engagement structure.

Thus, due to the presence of the sealing portion, at a 45° oblique impact, the force that would otherwise propagate in the axial direction can be partially shared to the plane where the sealing portion is located, and the forces in the plane of the sealing portion ultimately It will spread to the edge of the end face of the seal and then propagate along the axial direction of other angles. Therefore, the mechanical dispersion effect is very obvious. For the 90° axial impact, the same reason, if there is no sealing part, the force will propagate axially at two 180 degree opposite points, and with the sealing part, the propagation sharing can be carried out over the entire surface.

Preferably, in the present invention, the first portion and the sealing portion are both solid structures.

Thereby, the first portion is made stronger, because the first portion acts as the first force receiving portion when the tool is moved or subjected to an impact, so it is necessary to strengthen the firmness of the portion.

As a preferred aspect of the present invention, there is further provided a metal casing, the metal casing being wrapped outside the body portion, and an interference fit between the metal casing and the body portion.

Therefore, when it is a male end protector, it is equal to or longer than the length of the protection section. When it is used as a female end protector, it is necessarily less than or equal to the length of the protection section due to size limitation. Preferably, the length must be greater than or equal to the protection section. 1/2 of the length. For special transportation needs and more severe transportation conditions, if the metal housing is added outside the main body portion, the advantages of further strengthening the structural strength and the impact resistance can be achieved, but the present invention is different from other similar fields in designing the present invention. It does not rely on the metal casing to achieve the main purpose of impact resistance, and the metal casing is a further optimization function to assist the buffer. The interference fit is close to the plastic and steel sleeve in all directions compared with the traditional undercut fixing method, which increases the friction contact area, thus eliminating the relative movement between the metal shell and the main body portion, which is greatly reduced. The possibility of loosening the metal casing is small. On the other hand, the choice of the fixing method also increases the consumption of the force and force transmission, disperses more quickly, and utilizes the strength of the metal itself to complete the deformation reduction force directly. The impact force, and at the same time, the main body of the plastic can share the impact force for the first time, instead of the existing method of directly offsetting the relative hardness of the metal hardness, so the tube end protection effect is better.

The invention has the following beneficial effects:

The invention has the advantages of effectively resisting the impact force in all directions, effectively protecting the pipe thread, and being light in weight, low in cost and convenient in manufacture.

DRAWINGS

1 is a side cross-sectional structural view showing a first embodiment of the present invention;

2 is a side cross-sectional structural view showing a second embodiment of the present invention;

Figure 3 is a perspective view showing the oblique force of the end portion according to the first embodiment of the present invention;

Figure 4 is a perspective view showing the oblique stress of the end portion of the second embodiment of the present invention;

Figure 5 is a diagram showing the force analysis of the end plane of the present invention;

6 is a schematic structural view of a first embodiment of a tool mating structure of the present invention;

Figure 7 is a schematic structural view of a second embodiment of the tool mating structure of the present invention;

Figure 8 is a schematic structural view of a third embodiment of the tool mating structure of the present invention;

9 is a schematic structural view of a fourth embodiment of the tool mating structure of the present invention;

10 is a schematic structural view of a fifth embodiment of the tool mating structure of the present invention;

11 is a schematic structural view of a sixth embodiment of the tool mating structure of the present invention;

12 is a schematic structural view of a seventh embodiment of the tool mating structure of the present invention;

Figure 13 is a perspective view of the three-dimensional force analysis of the end portion of the present invention;

Figure 14 is a force analysis diagram of the prior art when subjected to a vertical impact;

Figure 15 is a force analysis diagram of the present invention when subjected to a vertical impact;

Figure 16 is a schematic view showing the structure employed in the prior art;

Figure 17 is a schematic view showing the structure employed in the prior art;

18 is a schematic structural view of an eighth embodiment of the tool mating structure of the present invention;

In the figure, 1-body part; 1-1-side wall part; 1-2-compartment part; 3-sealing part; 1a-connection section; 1b-protection section; 1b-1-first part; 1b-2- Second part; 1b-3-third part; 1-4-tool fit structure; 1-4-1-fixed hole; 1-4-2-fixed groove; 1-4-3-cross counterbore; Metal housing.

detailed description

The invention will be further described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the first novel embodiment of the present invention includes a main body portion 1 and a sealing portion 3 which is divided into a side wall portion 1-1 in the radial direction and is disposed inside the side wall portion 1-1. The opposing portion 1-2 and the sealing portion 3 are provided inside the opposing portion 1-2. This embodiment is primarily applied to externally threaded tubular members.

The center of the radial cross section of the side wall portion 1-1, the abutting portion 1-2, and the sealing portion 3 are overlapped; the main body portion 1 is divided into the connecting portion 1a and the protective portion 1b in the axial direction. The side wall portion 1-1 extends to the connecting portion 1a, and the sealing portion 3 and the abutting portion 1-2 do not exceed the protective portion 1b. side The planes of the wall portion 1-1, the abutting portion 1-2, and the end portion of the sealing portion 3 on the side of the protective portion 1b are overlapped. A threaded structure for connecting and protecting the steel pipe thread is provided inside the side wall portion 1-1 extending to the connecting portion 1a, and the screw structure and the abutting portion 1-2 are disposed on the same side of the side wall portion 1-1. The side of the abutting portion 1-2 contacting the end of the nozzle is a flat surface, and the receiving groove can be disposed on the plane to match the thickness of the tube wall to further enhance the fixing effect, and at the same time, the nozzle wall can be better protected. The end portion of the protective portion 1b is provided with a tool fitting structure 1-4 formed to be recessed toward the connecting portion 1a.

The protection section 1b includes a first portion 1b-1, a second portion 1b-2, and a third portion 1b-3 which are sequentially disposed in the axial direction. The side of the first portion 1b-1 is curved, and the second portion 1b- The radial cross-sectional area of 2 is incremented or maintained by the first portion 1b-1 toward the third portion 1b-3, and the third portion 1b-3 is connected to the connecting portion 1a. The first portion 1b-1 and the sealing portion 3 have a solid structure.

In the first embodiment of the present invention, if the end portion is impacted by an external force, if it is a vertical impact force, the side wall portion 1-1, the abutting portion 1-2, and the sealing portion 3 of the present invention are located on the side of the protection portion 1b. The planes at which the ends are located are all coincident. As shown in FIG. 14, in the prior art, when the impact force in the vertical direction is received, the force is concentrated on the convex annular wall, and the area of the annular wall is limited, and the component force effect is limited, such as As shown in FIG. 15, when the impact force in the vertical direction is applied, the force is dispersed to the maximum extent by the plane of the end portion, that is, the area of the present invention subjected to the impact force is multiplied relative to the prior art. Therefore, the pressure generated by it becomes small, and the protection effect is better than the prior art.

As shown in Fig. 3 and Fig. 13, in the case of the external impact force in Fig. 3, when the A force acts obliquely on the end, when the A force reaches the end, it is decomposed into a diffused A- along the end plane. 2 force, an A-3 force transmitted along the extending direction of the side wall portion 1-1 and an A-1 force conducted in the original direction, and the A-1 force is finally decomposed again, wherein the vertical direction force is along the opposite portion 1-2 conduction, and the fitting part of the abutting portion 1-2 is a nozzle, and the nozzle has a stronger bearing capacity against the impact from the front than the other parts of the tube, and the force is decomposed multiple times. After the force, the force is limited in size, so there is almost no damage to the end of the nozzle, and its structural damage is also very small, and the decomposition of the A-2 force is shown in Figure 5, in Figure 5 The B force is the A-2 force. It can be seen from Fig. 5 that the B force spreads rapidly in all directions of the end plane when reaching the end side, and the vector relationship of the force is from the original direction of the B force to the two sides. The shorter the vector is the weakening of the force, and the structure of the plane itself makes the effect of the force offset very significant, so it is almost impossible for the sealing part 3. Any damage is caused. Since the main body portion 1 itself is completed by one injection molding, the high transmission efficiency of the force in each component does not cause excessive damage to the local point.

As shown in FIG. 2, the second novel embodiment of the present application includes a main body portion 1 and a sealing portion 3 which is divided into a side wall portion 1-1 in the radial direction and is disposed at the side wall portion 1-1. The outer opposing portion 1-2 and the sealing portion 3 are provided inside the side wall portion 1-1. This embodiment is primarily applied to internally threaded tubular members.

The center of the radial cross section of the side wall portion 1-1, the abutting portion 1-2, and the sealing portion 3 are overlapped; the main body portion 1 is divided into the connecting portion 1a and the protective portion 1b in the axial direction. The side wall portion 1-1 extends to the connecting portion 1a, and the sealing portion 3 and the abutting portion 1-2 do not exceed the protective portion 1b. The planes of the side wall portion 1-1, the abutting portion 1-2, and the end portion of the sealing portion 3 on the side of the protective portion 1b are all overlapped. A thread structure for connecting and protecting the steel pipe thread is provided inside the side wall portion 1-1 extending to the connecting portion 1a, and the thread structure and the abutting portion 1-2 It is disposed on the same side of the side wall portion 1-1. The side of the abutting portion 1-2 contacting the end of the nozzle is a flat surface, and the receiving groove can be disposed on the plane to match the thickness of the tube wall to further enhance the fixing effect, and at the same time, the nozzle wall can be better protected. The end portion of the protective portion 1b is provided with a tool fitting structure 1-4 formed to be recessed toward the connecting portion 1a.

The protection section 1b includes a first portion 1b-1, a second portion 1b-2, and a third portion 1b-3 which are sequentially disposed in the axial direction. The side of the first portion 1b-1 is curved, and the second portion 1b- The radial cross-sectional area of 2 is incremented or maintained by the first portion 1b-1 toward the third portion 1b-3, and the third portion 1b-3 is connected to the connecting portion 1a. The first portion 1b-1 and the sealing portion 3 have a solid structure.

In the second embodiment of the present invention, if the end portion is impacted by an external force, if it is a vertical impact force, the side wall portion 1-1, the abutting portion 1-2, and the sealing portion 3 of the present invention are located on the side of the protection portion 1b. The planes at which the ends are located are all coincident. As shown in FIG. 14, in the prior art, when the impact force in the vertical direction is received, the force is concentrated on the convex annular wall, and the area of the annular wall is limited, and the component force effect is limited, such as As shown in FIG. 15, when the impact force in the vertical direction is applied, the force is dispersed to the maximum extent by the plane of the end portion, that is, the area of the present invention subjected to the impact force is multiplied relative to the prior art. Therefore, the pressure generated by it becomes small, and the protection effect is better than the prior art.

As shown in FIG. 4 and FIG. 13, in the case of the external impact force in FIG. 4, when the A force acts obliquely on the end, when the A force reaches the end, it is decomposed into a diffused A along the end plane. -2 force, an A-3 force conducted along the extending direction of the abutting portion 1-2 and an A-1 force conducted in the original direction, and the A-1 force is finally resolved again, wherein the vertical force is along the side wall The portion 1-1 is conducted, and the side wall portion 1-1 has the longest axial length in the three radial components, and the force digestion is the most thorough, so that the force acting on the thread is very small, and the protection is The thread, and its structural damage is also very small, and the decomposition of the A-2 force is shown in Figure 5. In Figure 5, the B force is the A-2 force. From Figure 5, the B force is reaching the end. When the side faces are fast, they are scattered to all directions of the end plane, and the vector relationship of the force is that the vector is shortened by the original direction of the B force to the two sides, and the force is weakened, and the plane itself has a significant effect on the force offset. Therefore, it is almost impossible to cause any damage to the sealing portion 3, since the main body portion 1 itself is completed by one injection molding, and the force is in each part. The transfer efficiency is high without causing localized excessive force point and cause damage.

In the embodiment of the tool mating structure 1-4 of the present invention, the sag depth of the tool mating structure 1-4 is less than 2/3 of the axial length of the abutting portion 1-2. The thickness of the first portion 1b-1 and the second portion 1b-2 is smaller than the axial length of the abutting portion 1-2 and greater than the depth of the tool fitting structure 1-4. The axial length of the sealing portion 3 is greater than or equal to the thickness of the first portion 1b-1 and less than or equal to the depth of the tool fitting structure 1-4. At least one side of the side wall of the tool mating structure 1-4 is connected to the side wall of the protection section 1b.

As shown in FIG. 6 , in the first embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a fixing hole 1-4-1, and the fixing hole 1-4-1 is symmetrically disposed on the end surface of the protective segment 1b. side.

As shown in FIG. 7, in the second embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a fixing groove 1-4-2, and the end surface of the protecting portion 1b has a diameter parallel to and passes through the fixing groove 1-4-2.

As shown in FIG. 8, in the third embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a fixing hole 1-4-1. And the fixing groove 1-4-2, the end surface diameter of the protection segment 1b is parallel and passes through the fixing groove 1-4-2, and the fixing holes 1-4-1 are symmetrically disposed on both sides of the fixing groove 1-4-2.

As shown in FIG. 9, in the fourth embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a cross counterbore 1-4-3, a fixing hole 1-4-1, and a fixing hole 1-4-1. Symmetrically disposed on both sides of the end face diameter of the protection section 1b, the center of the cross counterbore 1-4-3 is aligned with the center of the radial section of the main body portion 1, and since the cross counterbore 1-4-3 is mainly applied to the hoisting structure, The slotted depth of the cross counterbore 1-4-3 may exceed the connecting section 1a to ensure the entry of the hook, and the side wall of the cross counterbore 1-4-3 is not connected to the side wall of the guard section 1b.

As shown in FIG. 10, in the fifth embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a cross counterbore 1-4-3, a fixing slot 1-4-2, and the end faces of the guard segment 1b are parallel in diameter and Through the fixing groove 1-4-2, and the fixing groove 1-4-2 passes through a slotted symmetrical center line of the cross counterbore 1-4-3, the center of the cross counterbore 1-4-3 and the diameter of the main body portion 1 Aligned to the center of the section, and since the cross counterbore 1-4-3 is mainly applied to the hoisting structure, the slotted depth of the Phillips 1-4-3 can exceed the connecting section 1a to ensure the entry of the hook, the counter sinking hole The side walls of 1-4-3 are not connected to the side walls of the protection section 1b.

As shown in FIG. 11, in the sixth embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a cross counterbore 1-4-3, a fixing hole 1-4-1, and a fixing slot 1-4-2. The end faces of the protection segments 1b are parallel in diameter and pass through the fixing slots 1-4-2. The fixing holes 1-4-1 are symmetrically disposed on both sides of the fixing slots 1-4-2, and the fixing slots 1-4-2 pass through the countersinks. a slotted symmetrical center line of 1-4-3, the center of the cross counterbore 1-4-3 is aligned with the center of the radial section of the main body portion 1, and since the cross countersunk hole 1-4-3 is mainly applied to the hoisting structure, Therefore, the slotted depth of the cross counterbore 1-4-3 may exceed the connecting section 1a to ensure the entry of the hook, and the side wall of the cross counterbore 1-4-3 is not connected to the side wall of the protection section 1b.

As shown in FIG. 12, in the seventh embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a cross counterbore 1-4-3, a center of the cross counterbore 1-4-3 and the main body portion 1. The center of the radial section is aligned, and since the cross counterbore 1-4-3 is mainly applied to the hoisting structure, the slotted depth of the Phillips 1-4-3 can exceed the connecting section 1a to ensure the entry of the hook, the cross sink The side walls of the holes 1-4-3 are not connected to the side walls of the protection section 1b.

As shown in FIG. 18, in the eighth embodiment of the tool mating structure of the present invention, the tool mating structure 1-4 includes a cross counterbore 1-4-3, a fixing hole 1-4-1, and a fixing slot 1-4-2. The end faces of the protection segments 1b are parallel in diameter and pass through the fixing grooves 1-4-2. The fixing holes 1-4-1 are symmetrically disposed on both sides of the fixing grooves 1-4-2, and the center line and the cross of the fixing grooves 1-4-2 One slotted symmetrical center line of the hole 1-4-3 is at an angle of 45°, and the center of the cross counterbore 1-4-3 is aligned with the center of the radial section of the main body portion 1, and due to the cross countersunk hole 1-4-3 Mainly used in the lifting structure, so the slotted depth of the cross counterbore 1-4-3 can exceed the connecting section 1a to ensure the entry of the hook, the side wall of the cross counterbore 1-4-3 does not overlap the side wall of the protection section 1b connection.

The embodiments described above are only intended to describe the preferred embodiments of the invention, and are not intended to limit the scope of the invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the scope of the present invention. The technical content claimed in the present invention has been fully claimed. Remember It is included in the claims.

Claims (16)

An oil pipe thread protection device characterized by having an arcuate surface that fits a pipe member to be protected, comprising a radially centered sealing portion (3) and a body portion surrounding the sealing portion (3) ( 1) the main body portion (1) includes adjacent side wall portions (1-1) and abutting portions (1-2) which are distinguished by the curved surface extension in the radial direction, the side wall portion ( 1-1) comprising the curved surface, the abutting portion (1-2) is radially cantilevered on the same side of the side wall portion (1-1) as the curved surface; The center portions of the radial cross sections of the side wall portion (1-1), the abutting portion (1-2), and the sealing portion (3) are coincident; The main body portion 1 includes a connecting portion (1a) and a protective portion (1b) in the axial direction; The side wall portion (1-1) extends to the connecting portion (1a), and the sealing portion 2 has an axial dimension smaller than an axial dimension of the abutting portion (1-2), and the abutting portion (1-2) The axial dimension is less than or equal to the protection segment (1b); The side wall portion (1-1), the abutting portion (1-2), and the sealing portion (3) have a flush top plane. A petroleum pipe thread protection device according to claim 1, characterized in that one side of the side wall portion (1-1) extending to the connecting portion (1a) is provided for connecting and protecting the steel pipe thread The threaded structure, and the threaded structure and the abutting portion (1-2) are disposed on the same side of the side wall portion (1-1). A petroleum pipe thread protection device according to claim 2, wherein said abutting portion (1-2) is disposed inside said side wall portion (1-1), said sealing portion (3) It is disposed inside the opposite portion (1-2). A petroleum pipe thread protection device according to claim 2, wherein said abutting portion (1-2) is disposed outside said side wall portion (1-1), said sealing portion ( 3) is disposed inside the side wall portion (1-1). A petroleum pipe thread protection device according to claim 1, characterized in that: the end portion of the protection section (1b) is provided with a tool fitting structure formed by recessing in the direction of the connecting section (1a) (1) 4). A petroleum pipe thread protection device according to claim 5, wherein the tool fitting structure (1-4) has a depression depth smaller than 2/3 of the axial length of the abutting portion (1-2) . A petroleum pipe thread protection device according to claim 1, wherein said protection section (1b) comprises a first portion (1b-1) and a second portion (1b-) which are sequentially disposed in the axial direction. 2) and the third portion (1b-3), the side of the first portion (1b-1) is curved, and the radial portion of the second portion (1b-2) The cross-sectional area is incremented or remains unchanged from the first portion (1b-1) toward the third portion (1b-3), the third portion (1b-3) and the connecting portion (1a) Connected. A petroleum pipe thread protection device according to claim 5, wherein said tool fitting structure (1-4) comprises a fixing hole (1-4-1), said fixing hole (1-4) -1) Symmetrically placed on both sides of the end face diameter of the protection section (1b). A petroleum pipe thread protection device according to claim 5, wherein said tool fitting structure (1-4) comprises a fixing groove (1-4-2), and said protective segment (1b) has a diameter of an end face. Parallel and through the fixing groove (1-4-2). A petroleum pipe thread protection device according to claim 5, wherein said tool fitting structure (1-4) comprises a fixing hole (1-4-1) and a fixing groove (1-4-2) The protective segment (1b) has end face diameters parallel to each other and passes through the fixing groove (1-4-2), and the fixing hole (1-4-1) is symmetrically disposed in the fixing groove (1-4-2) ) Both sides. A petroleum pipe thread protection device according to claim 8 or 9 or 10, characterized in that at least one side of the side wall of the tool fitting structure (1-4) and the side wall of the protection section (1b) connection. A petroleum pipe thread protection device according to claim 8 or 9 or 10, wherein the tool fitting structure (1-4) comprises a cross counterbore (1-4-3). A petroleum pipe thread protection device according to claim 7, wherein said first portion (1b-1) and said second portion (1b-2) have a thickness smaller than said opposite portion The axial length of (1-2) is greater than the depth of the tool mating structure (1-4). A petroleum pipe thread protection device according to claim 7, characterized in that the axial length of the sealing portion (3) is greater than or equal to the thickness of the first portion (1b-1) and less than or equal to the tool Fit the depth of the structure (1-4). A petroleum pipe thread protection device according to claim 7, wherein the first portion (1b-1) and the sealing portion (3) are both solid structures. A petroleum pipe thread protection device according to claim 1 or 3 or 4 or 5, further comprising a metal casing, said metal casing being wrapped outside said main body portion (1), and An interference fit between the metal housing and the body portion (1).

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