RU169972U1 - Device for pneumoabrasive treatment of the inner and outer surfaces of tube blanks - Google Patents

Abstract

The utility model relates to the machining of deep holes in pipe billets, in particular to the processing of pipe billets by a pneumatic abrasive medium. It can be used in the process of grinding the outer and inner surfaces of long pipes. The technical result is achieved by using a device for pneumatic abrasive treatment of the inner and outer surfaces of pipe blanks containing a reservoir for the working medium, a pressure pipe installed on the base of the composite left and right flanges from coaxially placed outer and inner sleeves equipped with centering recesses for basing tube blanks, and an intermediate sleeve, sleep zhennoy collet for locking a screw, consisting of dvutelnogo body made in the form of the outer and inner tubes with the outer and inner spirals coaxially arranged one inside the other with a gap communicating with the pressure pipe. The auger is equipped with nozzles located between the turns of the spirals and on their inclined planes for separate supply of abrasive and compressed air. The technical result is an increase in productivity and quality of processing.

Description

The utility model relates to the machining of deep holes in pipe billets, in particular to the processing of pipe billets by a pneumatic abrasive medium. It can be used in the process of grinding the outer and inner surfaces of long pipes.

A device for jet-abrasive treatment of bodies of revolution, comprising a cylindrical element for implementing the Coanda effect, a working chamber with a mounting place for a rotating workpiece, in the lower part of which a flat feed nozzle is mounted, on the opposite wall of the cylindrical element there is a pipe for feeding into the feed stream under the action of its own weight of the return abrasive (Pat. RU 11128, IPC B24C 3/22, publ. 16.09.1999).

The disadvantage of this device is the inability to combine the processing of external and internal surfaces, which reduces its performance.

Another disadvantage of the installation is the impossibility of using it in a known manner for simultaneously supplying intersecting streams of air jets and portions of dry abrasive and the impossibility of reflecting a mixed pneumoabrasive stream when it moves in the gap between the pipes and the formation of turbulence of the stream between the turns of the screw when combined processing of the external and internal surfaces of several coaxially installed pipe blanks. The lack of such a possibility for a known device, even in the case of its improvement and integration into known devices, reduces its performance.

A known installation for blasting the inner surface of pipe billets, containing a storage-consumable unit, consisting of two separately located bins, inkjet devices inside the bins and the piping system of the working fluid with the nozzles of the jet devices brought to the side surfaces, with the workpieces sequentially attached to them, and pipelines of the working fluid connected to the internal cavity of the opposite hopper (Pat. RU 2274540, IPC V24C 3/16, publ. 04/20/2006).

The disadvantage of the installation is the impossibility of using it in a known manner to supply the flow of abrasive at the right angle when moving it with compressed air in the gap between the pipes and the formation of directional movement without swirling the flow while combining the processing of the external and internal surfaces of several coaxially installed tube blanks. The lack of such a possibility in a known device reduces its performance.

A known automatic device for waterjet waterjet processing of the external and internal surfaces of parts that are bodies of revolution, made in the form of several isolated processing chambers with a bar conveyor with U-shaped grips passing through them, equipped with a set of nozzles, a reservoir for the pulp, fixing and clamping elements, allowing simultaneously install and process several parts (A.S. SU 180109, IPC V24S 3/12, publ. 11/28/1966).

The disadvantage of the installation is the impossibility of its use in a known way to reflect the flow of hydroabrasive fluid when it moves in the gap between the pipes and the formation of turbulence of the stream when combining processing of the outer and inner surfaces of several coaxially installed tube blanks.

Another disadvantage of this device is the inability to ensure turbulence in the flow of an abrasive medium transported under air pressure over considerable distances (up to 12 m). The absence of such a possibility in a known device reduces its technological capabilities.

A device for treating the inner surface of pipes containing a nozzle nozzle, elements for supplying a working substance and an energy carrier and a flow swirl made in the form of a sleeve with conical and curved sections on its outer surface, equipped with an axial mounting rod, a flange, elements for supplying a working substance and an input element energy carrier, while on the inner surface of the nozzle nozzle is made expanding towards the exit curved section (Pat. RU 2108903, IPC V24C 5/04, V24C 3/16, publ. 04/20/1998).

The disadvantage of this device is the impossibility of combining the processing of external and internal surfaces, which reduces its productivity, as well as the difficulty of creating a deviation of the supply stream along the entire length of the chamber and the complexity of the acceleration channel if it is necessary to process extended surfaces, such as long pipes. Since long pipes, for example pipes according to GOST 8731, 23270, GOST R 53383, can have a length of up to 9 m, when processing them, it is necessary to have a sufficiently long chamber for movement processing the outer and inner surfaces of the abrasive medium to create a swirling flow and move it under various corners to the processed surface.

The disadvantage of the installation is the impossibility of its use in a known way to reflect the flow of hydroabrasive fluid when it moves in the gap between the pipes and the formation of turbulence of the stream when combining processing of the outer and inner surfaces of several coaxially installed tube blanks. The lack of such technological capabilities of the known device, in case of its integration into known devices, reduces its technological capabilities.

A device is known for hydroabrasive treatment of the inner and outer surfaces of pipe billets, comprising a reservoir for a hydroabrasive medium, pressure and drain pipelines mounted on the base of the left and right flanges with mirrored centering recesses for basing pipe billets and through holes of cylindrical shape, made with the possibility of fixing between them tube blanks of different diameters, mounted coaxially one in another (Pat. RU 152429, IPC V24C 3/02, V24C 9/00, publ. 05.27.2015).

The disadvantage of the installation is the use of a hydroabrasive medium containing water, which is unacceptable for the treatment of pipes to be coated with polymers and other protective substances.

In addition, a simple replacement in the known device of a hydroabrasive fluid (working medium) with an air mixture is not economically feasible, because To achieve satisfactory performance, you will have to create too large parameters for the speed of abrasive particles and air pressure. The lack of these features in this device reduces its economic and technological capabilities.

The closest structurally is a device for hydroabrasive treatment of the inner and outer surfaces of pipe billets, containing a reservoir for the working medium, a pressure pipe and left and right flanges mounted on the base, made of coaxially placed outer, intermediate and inner bushings equipped with clamping collets and centering recesses for basing and fixing tube blanks and spiral augers mounted coaxially, equipped with rotation mechanisms with the possibility of reverse of the normal movement installed between the pipe blanks and coaxially with them a hollow spiral screw with an internal spiral made of elastic material with protrusions on the external and internal spirals, equipped with abrasive elements (Pat. RU 159213, IPC V24C 3/02, V24C 9/00, publ. 02/10/2016).

The disadvantage of this device is the use of waterjet media: since the residual moisture interferes with further coating on the surface of the pipe blanks, the surface obtained after processing must be subjected to additional drying.

The objective of the technical solution is to develop a new high-performance device for dry processing of the inner and outer surfaces of pipe billets

The technical result is to increase the productivity and quality of processing of the inner and outer surfaces of the tube blanks.

The technical result is achieved when using a device for pneumatic abrasive treatment of the inner and outer surfaces of pipe billets, containing a reservoir for the working medium, a pressure pipe, composite left and right flanges made of coaxially placed outer, inner and intermediate bushings and installed on the base, a screw with a housing and external and internal spirals, made with the possibility of installation between the tube blanks coaxially with them, and rotation mechanisms made with the possibility of reversal In this case, the external movement of the screw, while the outer and inner bushings are made with centering recesses for the base of the tube blanks, and the intermediate sleeve contains clamping collets for fixing the screw, while the screw housing is made two-piece in the form of an outer pipe and an inner pipe coaxially mounted one into another with a gap communicating with the pressure pipe, while the outer and inner spirals of the screw contain nozzles located on their inclined planes, and the outer pipe and

the inner pipe of the screw housing contains radial nozzles located between the turns of the said outer and inner spirals, and in the outer and inner pipes of the screw housing there are closed screw channels communicated with the nozzles of the screw spirals and with the reservoir for the working medium.

The essence of the technical solution lies in the direction of the working medium at the right angle to the surface to be treated by creating a mechanism for air distribution and distribution of dry abrasive material along the entire length of the surfaces to be treated by separately supplying the abrasive and compressed air to the desired point of contact with the surface to be treated and mixing them near the surface to be treated with air-abrasive processing of the outer and inner cylindrical surfaces of coaxially installed long pipe blanks. This increases the productivity and quality of surface treatment of pipe billets. In addition, mixing the jets of compressed and abrasive material outside the nozzle is preferable, since the passage of the already combined jets through the nozzle, as a rule, leads to its rapid wear.

The auger of the device consists of a two-body housing, external and internal spirals. The screw housing consists of an outer and an inner pipe coaxially mounted one into the other with a gap. In this case, the external spiral of the screw is located on the external pipe of the screw housing, and the internal spiral of the screw is located on the internal pipe of the screw housing. Both pipes are equipped with radial nozzles located between the coils of the spirals and facing the respective machined surfaces of the pipe blanks, and the gap between the pipes of the auger housing communicates with a pressure pipe supplying an air stream under pressure, which provides compressed air.

In addition, on the counter surfaces of the outer and inner pipes of the screw housing, closed screw channels are made for supplying dry abrasive, and the inclined planes of the internal and external spirals of the screw are provided with nozzles. Closed screw channels communicate with the reservoir for the working environment and with the nozzles of the spirals of the screw, which ensures the supply of abrasive to the treated surfaces.

Thus, during pneumatic abrasive treatment of tube billets, the separate supply of abrasive and compressed air directly to the point of contact with the surface being treated as a result of mixing them near the surface to be processed allows for efficient air distribution and distribution of dry abrasive material over the entire length of the surfaces to be treated, which in turn leads to an increase in productivity and the quality of processing of the inner and outer surfaces of the tube blanks.

In FIG. 1 shows a longitudinal section of a device for pneumoabrasive processing of the inner and outer surfaces of tube blanks. In FIG. 2 shows a longitudinal section of the screw.

A device for pneumatic abrasive treatment of the inner and outer surfaces of tube billets consists of a base 1 and a composite left flange 2 and a composite right flange 3 mounted on it, each of which consists of an outer 4, intermediate 5 and 6 inner bushings mounted coaxially in one another respectively. On the outer 4 and inner 6 bushings of the left 2 and right 3 flanges, centering recesses 7 are made for basing the tube stocks 8 (tube stock with a smaller diameter), 9 (tube stock with a larger diameter). In each centering recess 7 of the outer 4 and inner 6 bushings of the left flange 2, at least three spring-loaded crackers 10 are evenly spaced around the circumference.

The intermediate sleeves 5 of the left 2 and right flanges 3 are equipped with clamping collets 11 for clamping and rotating the screw, the two-body housing of which is made in the form of an outer pipe 12 and an inner pipe 13, coaxially mounted one into the other with a gap 14. The outer pipe 12 of the screw housing is provided with an external spiral 15, and the inner pipe 13 of the screw housing is provided with an internal spiral 16. The gap 14 between the pipes 12 and 13 of the screw housing communicates with a pressure air pipe (not shown in FIG.), Using a compressor to supply an air stream under pressure. The outer pipe 12 and the inner pipe 13 of the screw housing are provided with radial nozzles 17 located between the turns of the outer 15 and the inner 16 of the spirals and facing the respective machined surfaces of the pipe blanks. The nozzles 17 communicate with a gap 14 through the holes 18 in the outer 12 and inner 13 pipes of the screw housing.

The outer 15 and inner 16 spirals are equipped with nozzles 19 located on their inclined planes. On the counter surfaces of the outer 12 and inner 13 pipes of the screw housing, closed screw channels 20 are made, communicating with the nozzles 19 of the screw spirals and with the reservoir 21 for the working medium. Nozzles 19 communicate with closed screw channels 20 through additional intermediate channels (not shown in FIG.), Which are performed in screw spirals or inserted into hollow spirals.

Closed screw channels 20 are formed from screw grooves made on the counter surfaces of the outer 12 and inner 13 pipes of the screw housing, closed with a durable elastic material.

The nozzles 19 of the screw spirals are located at an angle to the inclined planes of the spirals, ensuring the convergence and mixing of the abrasive and compressed air from the radial nozzles 17 at the desired contact point on the work surface.

In the outer 4 and inner 6 bushings of the left flange 2, through holes 22 are made, communicating through a pipe 23 with a reservoir 21 for the working medium.

On the left flange 2 and the right flange 3 are installed mechanisms of rotation of the auger with reversible electric motors 24.

The device operates as follows.

Before the start of pneumatic abrasive treatment, the left flange 2 and the right flange 3 are separated by a length exceeding the maximum length of the pipe blanks 8 and 9, as well as the length of the screw housing, which is assumed to be equal to the length of the pipe blanks.

At the same time, pipe blanks 8 and 9 are based in centering recesses 7, and the screw housing is located in collets 11 of the right flange 3. Next, a pipe clamp drive (not shown) is turned on, while the left flange 2 is shifted to the length of the pipe blanks 8 and 9. Crackers 10 under the action of springs fix tube blanks.

After that include electric motors 24, starting the mechanisms of rotation of the screw. In the process of rotation of the outer 12 and inner 13 pipes of the auger body, the abrasive and air are supplied simultaneously under pressure.

When the compressor is turned on, air under pressure is supplied through the pressure pipe to the gap 14, from where, through the holes 18 and the radial nozzles 17, respectively, to the machined surfaces of the pipe blanks 8 and 9. The abrasive is fed to the machined surfaces of the pipe blanks 8 and 9 from the reservoir using the corresponding compressor through screw channels 20 and nozzles 19 on the spirals of the screw. The flow of abrasive and air under pressure are mixed near the surface to be treated and are processed at the point of contact with the surface to be treated.

As a result of rotation of the outer 12 and inner 13 pipes of the screw housing, the mechanical effect of abrasive particles mixed with the air flow on the machined surfaces of the pipe blanks 8 and 9 is carried out uniformly and throughout their length.

Next, the air flow in the mixture with the abrasive is removed through the through holes 22.

At the end of the pneumoabrasive surface treatment, the abrasive and air supply compressors, and the electric motors 24 turn off and remove the processed tube blanks 8 and 9.

Next, the processing process is repeated with new pipe blanks.

Processing parameters: abrasive material electrocorundum 24 A grain size M20; M40; M63; 8; 10; K = 20%; p _n * = 0.1 ... 0.5 MPa; L = 50 ... 150 mm; α = 15 ... 90 °; T = 0 ... 300 s.

The abrasive treatment of tube blanks installed coaxially in one package is carried out simultaneously by a multi-nozzle twin-screw screw (the screw housing consists of an outer pipe 12 with an external spiral 15 and an inner pipe 13 with an internal spiral 16) so that the abrasive mass has the ability to be fed to the surface under air pressure by joint supply of abrasive and compressed air through nozzles to the desired contact point near the surface being machined and at the right angle to the machined outer and inner pipe surfaces blanks 8 and 9, respectively, which allows the principle of dry (anhydrous) cleaning.

In addition, the separate supply of abrasive and compressed air allows for wall sliding of the abrasive, i.e. treat using compressed air jets flooded with abrasive slurry, which improves the quality of processing.

Thus, the proposed device for pneumatic abrasive treatment of the inner and outer surfaces of tube blanks with a dry abrasive under the influence of jets of a mixed mixture distributed over the machined surfaces formed at the point of contact with the said surfaces provides an increase in device productivity and the quality of machining the outer and inner surfaces of tube blanks when the screw rotates .

Claims (1)

A device for pneumatic abrasive treatment of the inner and outer surfaces of pipe billets, containing a reservoir for the working medium, a pressure pipe, composite left and right flanges made of coaxially placed outer, inner and intermediate bushings and installed on the base, a screw with a housing and outer and inner spirals, made with the possibility of installation between the pipe blanks coaxially with them, and rotation mechanisms made with the possibility of reverse movement of the screw, while the outer and inner the sleeves are made with centering recesses for basing the tubular workpieces, and the intermediate sleeve contains clamping collets for fixing the screw, characterized in that the screw body is made double in the form of an outer pipe and an inner pipe coaxially mounted one into the other with a gap communicating with the pressure pipe, the outer and inner spirals of the screw contain nozzles located on their inclined planes, and the outer tube and inner pipe of the screw housing contain radial nozzles located between the turns of the aforementioned utyh outer and inner coils, in which the outer and inner tubes auger housing made closed helical channels communicated with the screw spirals, nozzles with a reservoir for the working medium.

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