Automatic lining dragging device of lining oil pipe

Abstract

The utility model relates to the field of oil exploitation equipment, and discloses an automatic lining dragging device for a lining oil pipe, which comprises a lining pulling-out mechanism, a lower base, an upper base, a machine body frame, a pneumatic control mechanism, a chain transmission mechanism and a steel wire rope transmission mechanism, the pneumatic control mechanism comprises two lining pushing air cylinders, a pushing seat air cylinder, a lifting air cylinder, a first electromagnetic valve, a second electromagnetic valve, an air pipeline and a remote controller; the chain transmission mechanism comprises a motor and a chain which is driven by the motor and moves in a one-way closed-loop mode. The steel wire rope transmission mechanism comprises a motor and a steel wire rope which is driven by the motor and can move in a bidirectional closed-loop mode. According to the utility model, the mechanical line production of pulling out and slipping of the lining of the lining oil pipe is fully realized, and the automatic operation level is greatly improved; manpower is further saved, and the working efficiency is remarkably improved; and the safe operation is better guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of oil production equipment, in particular to an automatic lining pulling device for an inner-lined oil pipe. Background Art

[0002] Wear and corrosion are important causes of damage to metal pipes in the oil industry. As the oil field output fluid gradually enters the medium and high water content period, the corrosion problem of metal pipes becomes more and more prominent, seriously affecting the safety of oil production. In order to solve this technical problem, lined oil pipes came into being. The so-called lined oil pipe is a layer of ultra-high molecular weight polyethylene lined inside the ordinary steel oil pipe, so that the liner and the oil pipe are close together to form a "pipe in a pipe" structure. Lined oil pipes can significantly reduce the wear of the sucker rod and the inner wall of the oil pipe, improve the corrosion resistance of the inside of the oil pipe, and greatly reduce downhole failures. The performance of the lined pipe deteriorates after long-term use. In order to ensure the excellent performance of the lined oil pipe, it is necessary to pull out the waste liner from the oil pipe and then replace it with a new liner.

[0003] The liner extraction device used in production was initially bulky and needed to be hammered to operate in place, which was time-consuming and labor-intensive, inconvenient to use, troublesome to disassemble and replace, and unsafe. Later, the patent with announcement number CN219854350U disclosed "a liner extraction device for lined oil pipes", which has the advantages of being light and flexible, simple to operate, time-saving and labor-saving, easy to replace, and safe to use. However, in practice, it was found that after the liner extraction device was installed in place, the liner was pulled out under the drive of the winch. After each liner of the lined oil pipe was pulled out, it needed to be manually installed again for repeated operations, and the level of automated operation and work efficiency were not ideal. Utility Model Content

[0004] In order to overcome the defects of the prior art, the utility model provides an automatic lining pulling device for a lined oil pipe, and its technical solution is as follows:

[0005] An automatic lining pulling device for a lined oil pipe comprises a lining extraction mechanism, wherein a base handle is connected to a main shaft, and threads are arranged at the upper and lower ends of the main shaft, and a supporting member, a bearing member, an expansion member, a diagonal support member and a fastener are sequentially mounted on the main shaft from bottom to top; the supporting member is a hollow structure with a convex cross section; the bearing member is a retaining ring, and a cross section of one end of the main shaft is an inverted concave cross section; the expansion member comprises an expansion plate, a spring, a pin shaft and a mounting block, and the three parts of the expansion plate are sequentially arranged from bottom to top as an arc-shaped vertical body, an arc-shaped horizontal body, an arc-shaped groove and an arc-shaped long plate, a pin hole is arranged in the middle of the arc-shaped vertical body, a spring is installed in the arc-shaped groove, and a barbed corrugation is arranged on the outer side of the arc-shaped long plate, and the expansion plate is hinged with the mounting block through the pin shaft. The diagonal brace is a conical piece; the fastener is a fastening nut; the device also includes a lower base, an upper base, a machine frame, a pneumatic control mechanism, a chain transmission mechanism and a wire rope transmission mechanism; a cross bar is provided on the outer side of the lower base, and a roller that rolls along the top of the machine frame is provided at the end of the cross bar; a vertical first mounting plate is provided on the front side of the lower base, a first mounting hole is provided in the middle of the first mounting plate, and a retaining ring sleeved on the main shaft is fixed in the first mounting hole, and two parallel guide rails in the front and rear directions are provided on the lower base; slots that cooperate with the guide rails are provided on both sides of the upper base, a vertical second mounting plate is provided on the front side of the upper base, and a second mounting hole is provided in the middle of the second mounting plate. The rear end of the handle is fixed in the second mounting hole, and a mounting bracket is provided on the upper base; a fixing plate is provided at the front end of the body frame, and a placement hole for placing the end of the lining oil pipe is provided on the upper part of the fixing plate, and the placement hole is aligned front and back with the first mounting hole; the pneumatic control mechanism includes a cylinder, a solenoid valve and an air pipeline, the cylinder is connected to the solenoid valve through the air pipeline, the cylinder includes two push cylinders, a push seat cylinder and a lifting cylinder, the two push cylinders are installed on both sides of the first mounting plate and are symmetrical to the first mounting hole, the piston rods of the two push cylinders pass through the first mounting plate and a push plate mounted on a retaining ring is fixed at the front end of the piston rod, and the cylinder barrel of the push seat cylinder is fixed to the lower base The front end of the piston rod is fixed to the upper base, the upper part of the lifting cylinder is hinged with a support arm, and the lower part is hinged with a rocker arm through the end of the piston rod. The lower part of the support arm is fixed to the upper base, and the middle part is fixed to the inclined baffle in the middle of the mounting bracket. The base of the rocker arm is hinged to the lower part of the mounting bracket, and a hook is provided on the top of the rocker arm; the chain transmission mechanism is arranged in the body frame, which includes a motor and a chain driven by it for unidirectional closed-loop motion. The gap between two adjacent connecting pins on the chain allows the hook to move freely in and out; the wire rope transmission mechanism includes a motor and a wire rope driven by it for bidirectional closed-loop motion. The wire rope is installed on the side of the body frame and connected to the lower base through a pull plate.

[0006] Furthermore, the pneumatic control mechanism has two solenoid valves, namely a first solenoid valve and a second solenoid valve, both of which are installed on the upper part of a third mounting plate arranged on the lower base, the air inlet P of the first solenoid valve and the second solenoid valve are connected to the air source through a three-way joint and an air pipeline, the air outlet A of the first solenoid valve is respectively connected to the air hole A of the two push cylinders through a three-way joint and an air pipeline, the air outlet B of the first solenoid valve is respectively connected to the air hole B of the two push cylinders through a three-way joint and an air pipeline, the air outlet A of the second solenoid valve is respectively connected to the air hole A of the push seat cylinder and the air hole A of the lifting cylinder through a three-way joint and an air pipeline, and the air outlet B of the second solenoid valve is respectively connected to the air hole B of the push seat cylinder and the air hole B of the lifting cylinder through a three-way joint and an air pipeline.

[0007] Furthermore, the pneumatic control mechanism also includes a remote controller, which controls the power-on and power-off states of the first solenoid valve and the second solenoid valve respectively.

[0008] Furthermore, the device also includes a limiting mechanism, which includes a fixed block, a moving block and a limiting bolt. The fixed block is longitudinally parallel to the moving block, the fixed block is located behind the moving block, the fixed block is welded to the lower base, and the moving block is welded to the upper base. The moving block is provided with a threaded hole that matches the rod of the limiting bolt.

[0009] Furthermore, the device also includes a number of sliding lining mechanisms, which include a sliding lining cylinder and a sliding lining bracket. The sliding lining cylinder is installed on the side of the body frame. The sliding lining bracket includes an inner rod, an outer rod and a connecting rod. The inner rod is inserted into the outer rod and can rotate. A triangle is fixed on the upper part of the inner rod. The top surface of the triangle is an inclined surface from top to bottom. The base of the connecting rod is fixed to the lower part of the inner rod. The top of the connecting rod is hinged to the top of the piston rod of the sliding lining cylinder. The outer rod is fixed to the side of the body frame through a cross brace.

[0010] Furthermore, the retaining ring is fixed in the first mounting hole in the following manner: a pit is set on the upper top surface of the retaining ring, a vertical threaded hole is set above the corresponding pit of the first mounting plate, a fastening bolt is screwed into the threaded hole, and the lower end of the rod of the fastening bolt is inserted into the pit.

[0011] Furthermore, the fasteners are two superimposed fastening nuts.

[0012] Furthermore, two of the card slots are arranged on each side of the upper base.

[0013] Furthermore, two rollers are arranged on each side of the lower base.

[0014] Compared with the prior art, the utility model mainly has the following advantages:

[0015] 1. Fully realize the mechanical flow operation of lining extraction and lining slipping of lined oil pipes, greatly improving the level of automated operation.

[0016] 2. Further save labor and significantly improve work efficiency.

[0017] 3.Safe operation is more guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure layout of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection relationship of the pneumatic control mechanism of the utility model;

[0020] Figure 3 This is a schematic diagram of the layout of the sliding lining mechanism of the utility model;

[0021] In the figure: 1-lined oil pipe, 2-fixed plate, 3-lined, 4-fastening nut, 5-conical member, 6-arc groove, 7-spring, 8-arc vertical body, 9-pin shaft, 10-push lining plate, 11-first mounting plate, 12-fastening bolt, 13-pit, 14-push lining cylinder, 15-second mounting plate, 16-first solenoid valve, 17-second solenoid valve, 18-third mounting plate, 19-mounting bracket, 20-support arm, 21-lifting cylinder, 22-rocker arm, 23-hook, 24-spindle, 25-arc long plate, 26-barbed corrugation, 27-arc horizontal body, 28-retaining ring, 29-base Handle, 30-push seat cylinder, 31-oblique baffle, 32-wire rope, 33-body frame, 34-first mounting hole, 35-roller, 36-pull plate, 37-second mounting hole, 38-guide rail, 39-lower base, 40-moving block, 41-fixed block, 42-limiting bolt, 43-slot, 44-chain, 45-connecting pin, 46-cross bar, 47-placement hole, 48-supporting piece, 49-upper base, 50-tee joint, 51-air pipeline, 52-cross brace, 53-triangle, 54-inner rod, 55-outer rod, 56-connecting rod, 57-sliding lining cylinder piston rod, 58-sliding lining cylinder. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in conjunction with the embodiments and drawings. Example 1

[0023] See also Figure 1 , Figure 2 and Figure 3An automatic lining pulling device for a lined oil pipe comprises a lining extraction mechanism, wherein a base handle 29 is connected to a main shaft 24, and threads are arranged at the upper and lower ends of the main shaft 24. The main shaft 24 is provided with a supporting member 48, a bearing member, an expansion member, a diagonal support member and a fastener in sequence from bottom to top; the supporting member 48 is a hollow structure with a convex cross section; the bearing member is a retaining ring 28, and one end of the supporting member is a concave cross section; the expansion member comprises an expansion plate, a spring 7, a pin shaft 9 and a mounting block (not shown), and the three parts of the expansion plate are, from bottom to top, an arc-shaped vertical body 8, an arc-shaped horizontal body 27, an arc-shaped groove 6 and an arc-shaped long plate 25, a pin hole is arranged in the middle of the arc-shaped vertical body 8, a spring 7 is installed in the arc-shaped groove 6, and a barbed corrugation 26 is arranged on the outer side of the arc-shaped long plate 25, and the expansion plate is provided with a pin hole. The shaft 9 is hinged with the mounting block; the diagonal support is a conical member 5; the fastener is a fastening nut 4; the device also includes a lower base 39, an upper base 49, a body frame 33, a pneumatic control mechanism, a chain transmission mechanism and a wire rope transmission mechanism; a cross bar 46 is provided on the outer side of the lower base 39, and a roller 35 rolling along the top of the body frame 33 is provided at the end of the cross bar 46; a vertical first mounting plate 11 is provided on the front side of the lower base 39, and a first mounting hole 34 is provided in the middle of the first mounting plate 11, and a retaining ring 28 mounted on the main shaft 24 is fixed in the first mounting hole 34, and two parallel guide rails 38 in the front and rear directions are provided on the lower base 39; slots 43 cooperating with the guide rails 38 are provided on both sides of the upper base 49, and a vertical A second mounting plate 15 is provided with a second mounting hole 37 in the middle of the second mounting plate 15, the rear end of the base handle 29 is fixed in the second mounting hole 37, and a mounting bracket 19 is provided on the upper base 49; a fixing plate 2 is provided at the front end of the body frame 33, and a placement hole 47 for placing the end of the lining oil pipe 1 is provided on the upper part of the fixing plate 2, and the placement hole 47 is aligned with the first mounting hole 34 front and back; the pneumatic control mechanism includes a cylinder, a solenoid valve and an air pipeline 51, the cylinder is connected to the solenoid valve through the air pipeline 51, the cylinder includes two push cylinders 14, a push seat cylinder 30 and a lifting cylinder 21, the two push cylinders 14 are installed on both sides of the first mounting plate 11 and are symmetrical to the first mounting hole 34, and the piston rods of the two push cylinders 14 pass through the first mounting plate 11 and a push lining plate 10 sleeved on a retaining ring 28 is fixed at the front end of the piston rod, the cylinder barrel of the push seat cylinder 30 is fixed to the lower base 39, the front end of the piston rod is fixed to the upper base 49, the upper part of the lifting cylinder 21 is hinged with a support arm 20, and the lower part is hinged with a rocker arm 22 through the end of the piston rod, the lower part of the support arm 20 is fixed to the upper base 49, and the middle part is fixed to the inclined baffle 31 in the middle of the mounting bracket 19, the base of the rocker arm 22 is hinged to the lower part of the mounting bracket 19, and the top of the rocker arm 22 is provided with a hook 23; the chain transmission mechanism is arranged in the body frame 33, which includes a motor (not shown) and a chain 44 of unidirectional closed-loop motion driven by it, and the gap between two adjacent connecting pins 45 on the chain 44 allows the hook 23 to move freely in and out;The wire rope transmission mechanism includes a motor (not shown) and a wire rope 32 driven by the motor and capable of bidirectional closed-loop motion. The wire rope 32 is mounted on the side of the machine frame 33 and connected to the lower base 39 through a pull plate 36. Example 2

[0024] See also Figure 1 , Figure 2 and Figure 3 An automatic lining pulling device for an inner-lined oil pipe, based on the technical solution described in Example 1, the pneumatic control mechanism has two solenoid valves, namely a first solenoid valve 16 and a second solenoid valve 17, both of which are installed on the upper part of a third mounting plate 18 provided on the lower base 39, the air inlet holes P of the first solenoid valve 16 and the second solenoid valve 17 are connected to the air source through a three-way joint 50 and an air pipeline 51, and the air outlet hole A of the first solenoid valve 16 is connected to the air source through a three-way joint 50 and an air pipeline 51. The air holes A of the two push-line cylinders 14 and the air outlet B of the first solenoid valve 16 are respectively connected to the air holes B of the two push-line cylinders 14 through a three-way joint 50 and an air pipeline 51, the air outlet A of the second solenoid valve 17 is respectively connected to the air holes A of the push-line cylinder 30 and the air holes A of the lifting cylinder 21 through a three-way joint 50 and an air pipeline 51, and the air outlet B of the second solenoid valve 17 is respectively connected to the air holes B of the push-line cylinder 30 and the air holes B of the lifting cylinder 21 through a three-way joint 50 and an air pipeline 51. For convenient operation, the power-on and power-off states of the first solenoid valve 16 and the second solenoid valve 17 are respectively controlled by a remote controller, thereby controlling the extension and retraction of the piston rods of each cylinder. Example 3

[0025] See also Figure 1 , Figure 2 and Figure 3 An automatic lining pulling device for a lined oil pipe, based on the technical solution described in Example 1, further comprises a limiting mechanism, which comprises a fixed block 41, a moving block 40 and a limiting bolt 42, the fixed block 41 is longitudinally parallel to the moving block 40, the fixed block 41 is located behind the moving block 40, the fixed block 41 is welded to the lower base 39, the moving block 40 is welded to the upper base 49, and the moving block 40 is provided with a threaded hole that matches the rod of the limiting bolt 42. Example 4

[0026] See also Figure 1 , Figure 2 and Figure 3An automatic lining pulling device for a lined oil pipe, based on the technical solution described in Example 1, further comprises a plurality of sliding lining mechanisms, including a sliding lining cylinder 58 and a sliding lining bracket, wherein the sliding lining cylinder 58 is mounted on the side of a machine frame 33, and the sliding lining bracket comprises an inner rod 54, an outer rod 55 and a connecting rod 56, wherein the inner rod 54 is sleeved inside the outer rod 55 and can rotate, a triangular body 53 is fixed on the upper part of the inner rod 54, and the top surface of the triangular body 53 is an inclined surface from top to bottom, the base of the connecting rod 56 is fixed to the lower part of the inner rod 54, the top of the connecting rod 56 is hinged to the top of the piston rod of the sliding lining cylinder 58, and the outer rod 55 is fixed to the side of the machine frame 33 through a cross brace 52. Example 5

[0027] See also Figure 1 , Figure 2 and Figure 3 An automatic lining pulling device for a lined oil pipe, based on the technical solution described in Example 1, the retaining ring 28 is fixed in the first mounting hole 34 in the following manner: a pit 13 is provided on the upper top surface of the retaining ring 28, a vertical threaded hole is provided above the first mounting plate 11 corresponding to the pit 13, a fastening bolt 4 is screwed into the threaded hole, and the lower end of the rod of the fastening bolt 4 is inserted into the pit 13. Example 6

[0028] See also Figure 1 , Figure 2 and Figure 3 An automatic lining pulling device for an inner-lined oil pipe, based on the technical solution described in Example 1, wherein the fastener is two superimposed fastening nuts 4 to enhance the anti-loosening effect; two clamping grooves 43 are provided on both sides of an upper base 49 to ensure the balance of the upper base 49 when it moves; two rollers 35 are provided on both sides of a lower base 39 to ensure the stability of the lower base 39 when it runs.

[0029] In order to enable those skilled in the art to better understand the present invention, the basic working principle of the present invention is briefly described as follows:

[0030] Install the automatic lining pulling device of the lining oil pipe in place. The lining oil pipe 1 can be transported to the fixed plate 2 by using existing roller rolling transmission equipment, and the end of the lining oil pipe 1 is placed in the placement hole 47; start the motor of the wire rope transmission mechanism, and driven by the positive movement of the wire rope 32, the lower base 39 moves forward along the body frame 33 through the roller 35, and the fastening nut 4, the cone 5 and the arc-shaped long plate 25 of the lining extraction mechanism enter the inner cavity of the lining oil pipe 1 in turn; use the remote control to control the second solenoid valve 17 to make it in the power-on state, and the push seat cylinder 30 and the lifting cylinder 21 are activated. The plug rod extends, the upper base 49 retreats, the main shaft 24 retreats, and the conical member 5 also retreats with the main shaft 24. During the retreat process, the inclined surface of the conical member 5 gradually opens the arc-shaped long plate 25, and the barbed corrugations 26 on the arc-shaped long plate 25 gradually grasp the inner wall of the liner 3. At the same time, the rocker arm 22 sinks, and the hook 23 hooks a connecting pin 45 on the chain 44 downward; the motor of the wire rope transmission mechanism is turned off, and the motor of the wire rope transmission mechanism is started. Driven by the chain 44 (the wire rope moves in the opposite direction at this time, which plays a safety auxiliary role) Assisted by the action of the roller 35, the lower base 39 moves backward along the machine frame 33, and the liner 3 is gradually pulled out of the liner oil pipe 1; during the process of pulling out the liner, under the action of the sliding liner cylinder 58, the connecting rod 56 drives the inner rod 54 to rotate, so that the inclined surface of the triangle 53 rotates to the bottom of the liner 3; after the liner 3 is completely pulled out, the second solenoid valve 17 is controlled by the remote control to be in a power-off state, the piston rods of the push seat cylinder 30 and the lifting cylinder 21 are retracted, the upper base 49 moves forward, the main shaft 24 moves forward accordingly, and the cone 5 also moves with the main shaft 24 moves forward, during which the inclined surface of the conical member 5 gradually separates from the arc-shaped long plate 25, and the barbed corrugations 26 on the arc-shaped long plate 25 gradually loosen the inner wall of the lining 3. At the same time, the rocker arm 22 is lifted, and the hook 23 is separated from the connecting pin 45; the first solenoid valve 16 is controlled by a remote control to be in an energized state, the piston rods of the two pushing cylinders 14 are extended, and the pushing plate 10 moves forward, so that the end of the lining 3 is completely removed from the lining extraction mechanism, and the lining 3 slides down to the site along the inclined surface of the triangle 53 of each sliding lining mechanism. In order to more flexibly control the distance that the upper base 49 moves relative to the lower base 39, on the one hand, the distance that the upper base 49 moves backward is controlled by the length of the rod of the limiting bolt 42 extending out of the threaded hole, thereby controlling the tension of the arc-shaped long plate 25; on the other hand, the distance that the upper base 49 moves forward is limited by the length of the convex shape of the supporting member 48, thereby preventing the risk of the upper base 49 moving away from the lower base 39 due to excessive forward movement.

Claims

1. An automatic lining pulling device for a lined oil pipe comprises a lining extraction mechanism, a base handle of which is connected to a main shaft, the upper and lower ends of the main shaft are provided with threads, and the main shaft is sequentially covered with a supporting member, a bearing member, an expansion member, a diagonal support member and a fastener from bottom to top; the supporting member is a hollow structure with a convex cross section; the bearing member is a retaining ring, one end of which has an inverted concave cross section; the expansion member comprises an expansion plate, a spring, a pin shaft and a mounting block, and the three parts of the expansion plate are sequentially, from bottom to top, an arc-shaped vertical body, an arc-shaped horizontal body, an arc-shaped groove and an arc-shaped long plate, a pin hole is provided in the middle of the arc-shaped vertical body, a spring is installed in the arc-shaped groove, and a barbed corrugation is provided on the outer side of the arc-shaped long plate, and the expansion plate is hinged to the mounting block through a pin shaft; the diagonal support member is a conical member; the fastener is a fastening nut; it is characterized in that The cam is provided with a plurality of guide rails, each of which is provided with a plurality of guide rails, and the plurality of guide rails are provided with a plurality of guide rails that are parallel to the top of the cam. A push cylinder, a push seat cylinder and a lifting cylinder, the two push cylinders are installed on both sides of the first mounting plate and symmetrically to the first mounting hole, the piston rods of the two push cylinders pass through the first mounting plate and a push plate mounted on the retaining ring is fixed at the front end of the piston rod, the cylinder barrel of the push seat cylinder is fixed to the lower base, and the front end of the piston rod is fixed to the upper base, the lifting cylinder is hinged with a support arm at the top and a rocker arm is hinged at the bottom through the end of the piston rod, the lower part of the support arm is fixed to the upper base, and the middle part is fixed to the inclined baffle in the middle of the mounting bracket, the base of the rocker arm is hinged to the lower part of the mounting bracket, and a hook is provided on the top of the rocker arm; the chain transmission mechanism is arranged in the body frame, which includes a motor and a chain driven by it for unidirectional closed-loop motion, and the gap between two adjacent connecting pins on the chain allows the hook to move freely in and out; the wire rope transmission mechanism includes a motor and a wire rope driven by it for bidirectional closed-loop motion, the wire rope is installed on the side of the body frame and connected to the lower base through a pull plate.

2. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The pneumatic control mechanism is provided with two solenoid valves, namely a first solenoid valve and a second solenoid valve, both of which are installed on the upper part of a third mounting plate arranged on the lower base, the air inlet P of the first solenoid valve and the second solenoid valve are connected to the air source through a three-way joint and an air pipeline, the air outlet A of the first solenoid valve is respectively connected to the air hole A of the two push cylinders through a three-way joint and an air pipeline, the air outlet B of the first solenoid valve is respectively connected to the air hole B of the two push cylinders through a three-way joint and an air pipeline, the air outlet A of the second solenoid valve is respectively connected to the air hole A of the push seat cylinder and the air hole A of the lifting cylinder through a three-way joint and an air pipeline, and the air outlet B of the second solenoid valve is respectively connected to the air hole B of the push seat cylinder and the air hole B of the lifting cylinder through a three-way joint and an air pipeline.

3. The automatic lining pulling device for the lined oil pipe according to claim 2, characterized in that: The pneumatic control mechanism also includes a remote controller, which controls the power-on and power-off states of the first solenoid valve and the second solenoid valve respectively.

4. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The device also includes a limiting mechanism, which includes a fixed block, a moving block and a limiting bolt. The fixed block is longitudinally parallel to the moving block, the fixed block is located behind the moving block, the fixed block is welded to the lower base, the moving block is welded to the upper base, and the moving block is provided with a threaded hole that matches the rod of the limiting bolt.

5. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The device also includes a plurality of sliding lining mechanisms, which include a sliding lining cylinder and a sliding lining bracket. The sliding lining cylinder is installed on the side of the body frame. The sliding lining bracket includes an inner rod, an outer rod and a connecting rod. The inner rod is inserted into the outer rod and can rotate. A triangle is fixed on the upper part of the inner rod. The top surface of the triangle is an inclined surface from top to bottom. The base of the connecting rod is fixed to the lower part of the inner rod. The top of the connecting rod is hinged to the top of the piston rod of the sliding lining cylinder. The outer rod is fixed to the side of the body frame through a cross brace.

6. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The retaining ring is fixed in the first mounting hole in the following manner: a pit is provided on the upper top surface of the retaining ring, a vertical threaded hole is provided above the corresponding pit of the first mounting plate, a fastening bolt is screwed into the threaded hole, and the lower end of the rod of the fastening bolt is inserted into the pit.

7. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The fasteners are two superimposed fastening nuts.

8. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The card slots are respectively provided with two on both sides of the upper base.

9. The automatic lining pulling device for the lined oil pipe according to claim 1, characterized in that: The rollers are respectively arranged with two on both sides of the lower base.

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