CN211052166U - On-Line Controlled Cooling Device for Small and Medium Diameter Hot-Rolled Seamless Steel Tubes - Google Patents

Abstract

An on-line control cooling device for small and medium-diameter hot-rolled seamless steel pipes, comprising multiple sets of cooling devices arranged between conveying roller tables and composed of a plurality of annular jet cooling devices, each annular jet cooling device passing through a tilting mechanism Connected to the main frame of the equipment, the inlet of the cooling device has a restraint guide mechanism composed of restraint rollers, and the upper and lower positions of the restraint guide mechanism and the size of the restraint guide hole can be adjusted. The device can correct the bending of the steel pipe through the restraint and guide mechanism, so that the steel pipe can pass through the cooling devices smoothly in sequence to ensure the smooth production; the steel pipe is cooled axially and the annular jet is concentric during the cooling process, so that the steel pipe is cooled evenly; it can meet the requirements of different diameter steel pipes. On-line cooling has a wide range of applications; when the steel pipe does not need on-line cooling, the tilting mechanism can be used to make the cooling device leave the transport roller table to avoid the high temperature steel pipe from baking the annular jet cooling device.

Description

On-Line Controlled Cooling Device for Small and Medium Diameter Hot-Rolled Seamless Steel Tubes

technical field

The utility model relates to the production technology of hot-rolled seamless steel pipes, in particular to an on-line control cooling device for hot-rolled seamless steel pipes of medium and small diameters.

Background technique

In the production of seamless steel pipes, controlled cooling of seamless steel pipes is an important technological means related to the microstructure and properties of steel. Seamless steel tube cooling is divided into offline cooling and online controlled cooling. Offline cooling is gradually being replaced by on-line controlled cooling due to higher process energy costs and lower efficiency.

The patent specification with the patent number of ZL201610933168.7 discloses an annular jet cooling device for controlled cooling of hot-rolled seamless steel pipes. The inner surface of the annular jet cooling device (as shown in Figure 1) has nozzles evenly arranged in the circumferential direction, The jet direction of the nozzle faces the forward or reverse direction of the running direction of the steel pipe, and the included angle with the axial direction of the steel pipe is 50-80°. The annular jet cooling device has a water inlet. The regulating valve group is used to adjust the flow and pressure of the spray water. When the device is used for controlled cooling of seamless steel pipes, according to cooling needs, multiple annular jet cooling devices can be arranged on the steel pipe running roller table to realize online controlled cooling of seamless steel pipes, and the cooling effect is relatively good. According to its patent specification, the cooling device is suitable for online control cooling of large-diameter seamless steel pipes with an outer diameter of 200mm to 460mm and a wall thickness of 10mm to 60mm. On-line cooling of 200mm small and medium-diameter seamless steel pipes will encounter the following technical problems:

The length of small and medium-diameter seamless steel pipes can often reach several tens of meters. During the production process, the steel pipe will have a certain degree of curvature after passing through the tension reducer. In the subsequent online cooling, it cannot be guaranteed that it is concentric with the annular jet cooling device, and the cooling is uniform. At the same time, due to the small outer diameter of the steel pipe and the thin thickness specification, it is more sensitive to temperature fluctuations, and uneven cooling, in turn, can easily lead to increased bending of the steel pipe, and even lead to unsmooth production. conduct. Therefore, it is not feasible to use this annular jet cooling device for online control cooling of small and medium-diameter seamless steel pipes. To use this annular jet cooling device for online control cooling of small-diameter seamless steel pipes, it is necessary to solve the problem of small and medium-diameter seamless steel pipes. Bending problems during online cooling of steel pipes.

The Chinese patent specification with application number 201410786324.2 discloses a steel pipe cooling device. The device is provided with a plurality of water spray cooling parts in a cooling water tank, and the inner cylinder of the water spray part has a plurality of water spray holes, which are sprayed out from the water spray holes. The cooling water cools the steel pipe. A steel pipe guide part is arranged at the front and rear of the cooling water tank, and the steel pipe guide part is formed by connecting a straight pipe and a tapered expansion pipe. If this guiding mechanism is used in conjunction with the above-mentioned annular jet cooling device to conduct on-line control cooling of small and medium-diameter seamless steel pipes, there are two technical problems: First, the steel pipe guiding mechanism has a simple structure, and the steel pipe passes through it, which cannot ensure that the steel pipe is in the During the cooling process, it is concentric with the annular jet cooling device, so the uniformity of cooling cannot be guaranteed; the second is that the small and medium-diameter seamless steel pipes have a certain degree of curvature after passing through the tension reducer, which cannot ensure smooth passage through the guiding mechanism. Affect the continuous operation of the entire steel pipe production line.

Utility model content

In view of the above problems existing in the prior art, the present utility model provides an on-line control cooling device and method for small and medium-diameter hot-rolled seamless steel pipes, so as to solve the problem of using the above-mentioned annular jet cooling device for on-line control cooling of small-diameter seamless steel pipes. the bending problem of the steel pipe.

The on-line control cooling device for small and medium-diameter hot-rolled seamless steel pipes provided by the utility model includes multiple sets of cooling devices arranged on the conveying roller table at the outlet of the tension reducer. The cooling process requirements are determined) composed of an annular jet cooling device, which is connected by a tipping mechanism (used to move the cooling device away from the cooling position in the conveyor roller table area when the control cooling process is not required in the production process of seamless steel pipes) On the main frame of the equipment; the inlet of each group of cooling devices is provided with a restraint guide mechanism; the restraint guide mechanism includes two restraint rollers A or Three constraining rollers B; the constraining roller is driven and rotatable by the transmission device, and its rotational speed matches the running speed of the steel pipe (to ensure the smooth running of the steel pipe cooling process). The transmission device is composed of a servo motor, a coupling and a connecting shaft. The servo motor passes through The coupling and connecting shaft are connected with the (active) restraint roller; the restraint roller is driven by a lifting mechanism driven by a hydraulic motor to rotate, and the size and upper and lower position of the hole pattern of the restraint guide mechanism can be adjusted to match the hole pattern with the diameter of the steel pipe. The axial direction is concentric with the annular jet cooling device.

The tilting mechanism is composed of a turning head, a rotary joint, a bracket and a hydraulic system; the bracket is fixed on the main frame of the equipment, the rotary joint is installed on the bracket, the turning head is fixedly connected with the rotary joint, and the rotary joint is connected to the annular joint through the water distribution pipe. The jet cooling device is fixedly connected. When the control cooling process is not required in the production process of the seamless steel pipe, the hydraulic system drives the turning head to rotate, and the annular jet cooling device is driven to rotate through the rotary joint, leaving the cooling position in the steel pipe transport roller table area; it needs to be used When the cooling process is controlled, the annular jet cooling device is reversed and returned to the cooling position on the conveying roller table.

The method for on-line controlled cooling of small and medium-diameter hot-rolled seamless steel pipes with the above-mentioned on-line controlled cooling device includes the following steps:

1) Turn the annular jet cooling device of the cooling device to the cooling position of the steel pipe transport roller table through the tilting mechanism; make the center line of the annular jet cooling device consistent with the center line of the hole pattern of the tension reducer;

2) According to the outer diameter of the steel pipe, adjust the transport roller table to the height suitable for the steel pipe, and adjust the restraint roller of the restraint guide mechanism, so that the size of the restraint guide hole formed by the restraint roller matches the outer diameter of the steel pipe, and the appearance of the restraint roller and the steel pipe is matched. The surfaces are tangent; the upper and lower positions of the restraint guide mechanism are adjusted by the lifting device, so that the restraint guide hole type and the annular jet cooling device are kept concentric; the speed of the restraint roller is adjusted by the transmission device to keep it consistent with the speed of the roller table;

3) According to the steel pipe rolling process, set the flow rate and pressure of the water sprayed by a single annular jet cooling device, and calculate the opening number of the corresponding cooling device;

4) Make the steel pipe production line run, and after the steel pipe is tension-reduced, it will pass through the transport roller table to realize on-line control cooling through the restraint guide mechanism and cooling device;

5) After the cooling process is completed, if the production process does not need to use the controlled cooling process, use the tilting mechanism to turn up the cooling device, leave the transport roller table, and switch to the air-cooling process for production.

The beneficial effects of the present utility model are:

1. In the present utility model, a restraint guide mechanism formed by a restraint roller is added before and after each group of cooling devices formed by an annular jet cooling device, and the size and upper and lower positions of the restraint guide hole formed by the restraint roller can be adjusted, so that the bending of the steel pipe can be adjusted. It is corrected, so that the steel pipe can pass through the cooling device smoothly in order to ensure the smooth progress of production;

2. The utility model can keep the steel pipe axially concentric with the annular jet cooling device during the cooling process through the restraining and guiding mechanism, so that the steel pipe can be cooled uniformly and meet the technological requirements of small and medium-diameter seamless steel pipes for cooling uniformity.

3. In the restraint guide mechanism of the present invention, the size of the restraint guide hole can be adjusted according to the diameter of the steel pipe, so as to adapt to the restraint guide cooling of the steel pipe with different diameters, and has a wide application range.

4. The annular jet cooling device used in the utility model adopts the jet impact cooling method, which can improve the cooling rate and cooling uniformity; through the diverting water collection pipe and the regulating valve group, the process parameters such as the water spray flow rate and pressure of the annular jet cooling device can be adjusted. Flexible regulation enables precise control of the temperature during the on-line cooling process of seamless steel pipes, which further improves the cooling effect and product quality.

5. When the production process does not need to use the controlled cooling process, the utility model can use the tilting mechanism to make the cooling device leave the transport roller table, so as to avoid the adverse effect of the annular jet cooling device caused by the high temperature steel pipe baking.

Description of drawings

Fig. 1 is the schematic diagram of the existing annular jet cooling device;

2 is a schematic diagram of the layout of the seamless steel pipe on-line controlled cooling process in Embodiment 1 of the utility model;

Fig. 3 is the schematic diagram of the restraint roller of different diameter seamless steel pipe restraint guide mechanism in the utility model embodiment 1, wherein Fig. 3 (a) is the working state diagram of the restraint roller when used for larger diameter seamless steel pipe, Fig. 3 (a) b) is the working state diagram of the restraining roller when it is used for small diameter seamless steel pipe;

Fig. 4 is the schematic diagram of the restraint roller of the different diameter seamless steel pipe restraint guide mechanism in the utility model embodiment 2, wherein Fig. 4 (a) is the working state diagram of the restraint roller when used for larger diameter seamless steel pipe, Fig. 4 ( b) is the working state diagram of the restraining roller when it is used for small diameter seamless steel pipe;

FIG. 5 is a schematic structural diagram of a restraining roller transmission device;

Fig. 6 is the structural representation of the tipping mechanism in Fig. 1;

7 is a schematic diagram of the layout of the on-line control cooling process of the seamless steel pipe according to Embodiment 2 of the present invention;

8 is a schematic diagram of the layout of the on-line control cooling process of the seamless steel pipe according to the third embodiment of the present invention.

Explanation of symbols in the figure: 1. Tension reducer, 2. Conveying roller table, 3. Circular jet cooling device, 4. Constraint guide mechanism, 401, (two-roller restraint) restraint roller A, 402, (three-roller restraint) ) Constraining rod B, 5, seamless steel pipe, 6, lifting device, 7, transmission device, 701, servo motor, 702, coupling, 703, connecting shaft, 8, tilting mechanism, 801, turning head, 802 rotation Joint, 803, bracket, 9, water distribution pipe, 10, main frame of equipment.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

The following examples are on-line cooling of the seamless steel pipe with a material of 20# and a specification of 141.3×12.9mm after stretching.

Example 1

In this embodiment, the on-line control cooling process layout of the seamless steel pipe 5 is shown in FIG. 2 . Two of the twenty-four annular jet cooling devices 3 are divided into twelve pairs (each pair is fixedly connected into one), and the twelve pairs are divided into twelve pairs. Three pairs of annular jet cooling devices are divided into four groups, which are respectively arranged on the transport roller table 2 at the outlet of the tension reducer 1. Each group of cooling devices is arranged with a restraint guide mechanism 4 at the inlet and outlet, a total of five Constraint guide mechanism. The annular jet cooling device of each group of cooling devices is connected to the equipment main body frame 10 through the tilting mechanism 8 .

The annular jet cooling device 3 (which is the prior art) is shown in Figure 1, and its inner surface is arranged with four rows of high-density nozzles uniformly and orderly arranged along the circumferential direction, and the jet direction of the nozzle jet direction is towards the positive direction of the running direction of the steel pipe. In the direction or reverse direction, the outer surface of the spray ring is provided with a water inlet (not shown). The flow rate and pressure are adjusted, the water pressure adjustment range is 0.2～0.8MPa, and the water volume adjustment range is 20～110m ³ /h.

As shown in Figures 3(a) and 3(b), the restraint guide mechanism of this embodiment includes two restraint rollers A401 distributed in a circular array along the axial centerline of the steel pipe; the restraint rollers are driven by the transmission device 7 to rotate, Its rotational speed matches the running speed of the steel pipe to ensure the smooth progress of the cooling process of the steel pipe. As shown in Figure 5, the transmission device of the restraining roller is composed of a servo motor 701, a coupling 702 and a connecting shaft 703. The servo motor is connected to the active restraining roller through the coupling and the connecting shaft; the restraining roller is driven by a hydraulic motor to rotate. The elevating mechanism (6) is driven to adjust the size and upper and lower positions of the steel pipe restraint guide hole pattern, so that the hole pattern matches the diameter of the steel pipe and corrects the bending of the steel pipe.

As shown in FIG. 6 , the tilting mechanism 8 of each group of cooling devices is composed of a tilting head 801, a rotary joint 802, a bracket 803 and a hydraulic system (not shown); the bracket is fixed on the main frame 10 of the equipment, and the rotary joint is installed on the On the bracket, the turning head is fixedly connected with the rotary joint, and the rotary joint is fixedly connected with the annular jet cooling device through the water distribution pipe 9 . When the seamless steel pipe production process does not need to use the controlled cooling process, the hydraulic system drives the turning head to rotate, and the turning head drives the annular jet cooling device to rotate through the rotary joint and the water distribution pipe, leaving the cooling position on the transport roller table; it is necessary to use the controlled cooling process. At the same time, the annular jet cooling device is reversed and returned to the cooling position in the area of the steel pipe transport roller table.

Use the above equipment to conduct on-line controlled cooling of steel pipes, follow the steps below:

Step 1: Control the tilting mechanism to turn the annular jet cooling device to the cooling position of the steel pipe transport roller table, so that the center line of the annular jet cooling device is consistent with the center line of the tension reducer;

Step 2: According to the outer diameter of the steel pipe, adjust the transport roller table to the set height, and adjust the hole pattern of the restraint guide mechanism to match the outer diameter of the steel pipe, so that the hole pattern of the restraint mechanism, the hole pattern of the tension reducer and the annular jet cooling device are in line with each other. The center line remains the same;

Step 2: According to the outer diameter of the steel pipe, adjust the transport roller table to a height suitable for the steel pipe, adjust the restraint roller of the restraint guide mechanism, so that the size of the restraint guide hole formed by the restraint roller matches the outer diameter of the steel pipe, and the size of the restraint roller and the steel pipe is matched. The outer surface is tangent; the upper and lower positions of the restraint guide mechanism are adjusted by the lifting device, so that the restraint guide hole pattern and the annular jet cooling device are kept concentric; the speed of the restraint roller is adjusted by the transmission device to keep it consistent with the speed of the roller table;

Step 3: According to the steel pipe rolling process, set the cooling water flow rate of a single annular jet cooling device to 80m ³ /h and the cooling water pressure to 0.45MPa, and calculate the opening number of the corresponding cooling device;

Step 4: Control the temperature of the steel pipe at 680°C, and after the steel pipe is reduced in diameter by tension, it is cooled on-line through the restraint guide mechanism and cooling device through the transport roller table;

Step 5: After the cooling process is completed, if the production process does not need to use the controlled cooling process, use the tilting mechanism to turn up the cooling device, leave the transport roller table, and switch to the air cooling process production.

Example 2

In this embodiment, as shown in FIG. 7 , the on-line control cooling process of the seamless steel pipe is arranged as follows: two twenty-four annular jet cooling devices 3 are divided into twelve pairs (each pair is fixedly connected into one), and the twelve For the annular jet cooling device, three pairs are divided into two groups, and two pairs are one group and four groups, which are respectively arranged in the area of the transport roller table 2 at the exit of the tension reducer 1, at the entrance and exit of each group of cooling devices. A restraint guide mechanism 4 is arranged respectively, and there are six restraint guide mechanisms in total. The annular jet cooling device of each group of cooling devices is connected to the equipment main body frame 10 through the tilting mechanism 8 .

The online control cooling process equipment and the online control cooling steps used in this embodiment are the same as those in Embodiment 1. The only difference is that the restraining guide mechanism restraining roller is shown in Fig. 4, consisting of three circular arrays distributed along the axial centerline of the steel pipe. Constraining roller B402 is composed; the adjustment range of water spray water pressure of the annular jet cooling device is 0.2～0.8MPa, and the adjustment range of water volume is 20～110m ³ /h.

Example 3

In this embodiment, as shown in FIG. 8 , the on-line control cooling process of the seamless steel pipe is arranged as follows: two twenty-four annular jet cooling devices 3 are divided into twelve pairs (each pair is fixedly connected into one), and the twelve The annular jet cooling devices are divided into six groups according to two pairs, which are respectively arranged in the area of the transport roller table 2 at the outlet of the tension reducer 1, and a constraint guiding mechanism 4 is arranged at the inlet and outlet of each group of cooling devices. Seven restraint guide mechanisms. The annular jet cooling device of each group of cooling devices is connected to the equipment main body frame 10 through the tilting mechanism 8 .

The online control cooling process equipment and the online control cooling steps used in this example are the same as those in Example 1; the only difference is that the adjustment range of the water spray water pressure of the annular jet cooling device is 0.2-0.8MPa, and the adjustment range of the water volume is 20-110m ³ /h.

In this embodiment, the number ratio of the restraint guide mechanism and the annular jet cooling device is increased in the low temperature cooling zone which is more sensitive to the bending of the steel pipe, which is beneficial to the homogenization of the steel pipe and the smoothing of the cooling production process.

Claims (2)

1. An online control cooling device for medium and small-caliber hot-rolled seamless steel pipes is characterized by comprising a plurality of groups of cooling devices arranged on a conveying roller way (2) at the outlet of a tension reducing mill (1), wherein each group of cooling devices is composed of a plurality of annular jet cooling devices (3), and the annular jet cooling devices (3) are connected to an equipment main body frame (10) through a tilting mechanism (8); the inlet of each group of cooling devices is provided with a constraint guide mechanism (4); the restraining and guiding mechanism (4) comprises two restraining rollers A (401) or three restraining rollers B (402) which are used for forming a steel pipe restraining and guiding hole type and are distributed in a circumferential array along the axial center line of the steel pipe; the restraint roller is driven to rotate by a transmission device (7), the rotating speed of the restraint roller is matched with the running speed of the steel pipe, the transmission device is composed of a servo motor (701), a coupler (702) and a connecting shaft (703), and the servo motor is connected with the restraint roller through the coupler and the connecting shaft; the constraint roller is driven by a lifting mechanism (6) driven by a hydraulic motor to rotate, and the size and the up-down position of the hole pattern of the constraint guide mechanism can be adjusted, so that the hole pattern is matched with the diameter of the steel pipe, and the axial direction of the constraint roller is concentric with the annular jet flow cooling device.

2. The on-line control cooling device for the medium and small diameter hot rolled seamless steel pipe according to claim 1, characterized in that the tilting mechanism (8) is composed of a turning head (801), a swivel joint (802), a bracket (803) and a hydraulic system; the support is fixed on the main body frame of the equipment, the rotary joint is arranged on the support, the turnover head is fixedly connected with the rotary joint, the rotary joint is fixedly connected with the annular jet cooling device through a water distribution pipe (9), when the cooling control process is not needed in the production process of the seamless steel pipe, the hydraulic system drives the turnover head to rotate, and the turnover head drives the annular jet cooling device to rotate through the rotary joint and the water distribution pipe and leaves a cooling position on a transport roller way; when the control cooling process is needed, the annular jet flow cooling device is reversed to return to a cooling position on the conveying roller way.

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