Double-anchor hydraulic telescopic tractor

Abstract

A hydraulic telescopic traction device with internal and external double anchoring includes a front external anchoring mechanism, a rear external anchoring mechanism, a serrated support plate, an internal anchoring mechanism, and a telescopic mechanism. The front external anchoring mechanism is used to fix the traction device to the wellbore and provides stable support during movement to prevent slippage. The rear external anchoring mechanism is also used to fix the traction device to the wellbore and provide stable support during movement to prevent slippage. The internal anchoring mechanism is used to clamp the central tube. The serrated support plate increases the friction between the anchoring mechanism and the wellbore, preventing slippage during movement and providing greater traction force. The telescopic mechanism coordinates with the movement of the front and rear external anchoring mechanisms to control the forward and backward movement of the traction device. This invention can achieve the purpose of transporting logging instruments to designated locations for operation, featuring high traction force, strong downhole adaptability, and high obstacle-crossing ability; overcoming the difficulty of long-distance transportation of logging instruments.

Description

Technical Field

[0001] This invention belongs to the field of downhole tools technology in oil and gas fields, and specifically relates to a hydraulic telescopic traction device with internal and external double anchoring. Background Technology

[0002] Horizontal wells and extended reach wells are important well types for oil and gas extraction, requiring regular inspection and maintenance to improve oil and gas recovery rates. This often necessitates transporting logging instruments to designated locations for operations. However, due to the production logging process in highly deviated wells and the increased horizontal sections in horizontal wells, logging instruments cannot reach designated working points by their own weight.

[0003] Traditional cobalt rod transfer can transport instruments to any location, but the process of lifting and lowering the cobalt rod can damage the instruments and cables. Tubing and coiled tubing transfers face problems such as cable damage, limited horizontal section transfer, and excessive costs when dealing with horizontal wells with large reach. Furthermore, the extension of the horizontal section can cause the coiled tubing to buckle, which limits the working length of the horizontal section.

[0004] In the prior art, a traction device with publication number CN104343404A has the problems of insufficient traction force and slow traction speed. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a hydraulic telescopic traction device with internal and external double anchoring, which can achieve the purpose of transporting logging instruments to a designated location for operation, and has the characteristics of large traction force, strong downhole adaptability and high obstacle crossing ability; thus overcoming the problem of difficulty in long-distance transportation of logging instruments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A hydraulic telescopic traction device with internal and external double anchoring includes a front external anchoring mechanism, a rear external anchoring mechanism, a serrated support plate, an internal anchoring mechanism, and a telescopic mechanism.

[0008] The front outer anchoring mechanism is used to fix the traction device and the well wall, and to provide fixed support during movement to prevent slippage.

[0009] The rear external anchoring mechanism is used to fix the traction device and the well wall, and to provide fixed support during movement to prevent slippage.

[0010] The inner anchoring mechanism is used to clamp the central tube;

[0011] The serrated support plate is used to increase the friction between the anchoring mechanism and the well wall, to prevent slippage during movement and to provide greater traction.

[0012] The telescopic mechanism is used to coordinate with the movement of the front outer anchoring mechanism and the rear outer anchoring mechanism to control the forward and backward movement of the traction device.

[0013] The front outer anchoring mechanism, rear outer anchoring mechanism, inner anchoring mechanism, and telescopic mechanism are sequentially connected by threads to form the entire traction device; the telescopic mechanism and control system are used to complete the traction action;

[0014] The control system is used to control the reversing valve to control the inlet and outlet of the hydraulic cylinder, thereby controlling the opening and closing of the front and rear outer anchoring mechanisms to clamp the pipe wall, and controlling the opening and closing of the anchor claws of the inner anchoring mechanism to complete the clamping of the central pipe.

[0015] The front outer anchoring mechanism includes a front anchoring mechanism hydraulic cylinder body 1, which is fixed to the inside of the front outer anchoring mechanism housing 2 by rivets.

[0016] The base of the hydraulic cylinder body 1 of the front anchoring mechanism and the front end of the outer shell 2 of the front outer anchoring mechanism are fastened together by bolts. The piston rod of the hydraulic cylinder piston 3 with external threads, located inside the hydraulic cylinder body 1 of the front anchoring mechanism, is connected to the threaded side of the anchoring mechanism support frame 4 with internal threads by threads. The unthreaded side of the anchoring mechanism support frame 4 with internal threads is connected to the connecting rod of the front anchoring mechanism connecting rod frame 5 by pins. The front anchoring mechanism connecting rod 5, the front anchoring mechanism connecting rod 7 and the curved sawtooth support plate 6 are connected by pins. The front anchoring mechanism connecting rod 7 is connected to the unthreaded side of the anchoring mechanism support frame 5 with internal threads by pins. The rear end of the outer shell 2 of the front outer anchoring mechanism and the anchoring mechanism support frame 8 with internal threads are fastened together by bolts.

[0017] The front anchoring mechanism connecting rod frame 5 and the front anchoring mechanism connecting rod 7 are symmetrically connected to the lower part of the curved sawtooth support plate 6 by pins. This arrangement allows for more stable control of the contact and separation between the curved sawtooth support plate 6 and the well wall, thereby achieving the effect of smooth operation of the traction device.

[0018] The rear outer anchoring mechanism includes a hydraulic cylinder body 22. The base of the hydraulic cylinder body 22 and the rear end of the outer shell 23 of the rear outer anchoring mechanism are fastened together by bolts. The threaded side of the hydraulic cylinder piston 21 with external threads, located inside the hydraulic cylinder body 22, is threadedly connected to the threaded side of the anchoring mechanism support frame 20 with internal threads. The unthreaded side of the anchoring mechanism support frame 16 with internal threads is connected to the connecting rod of the anchoring mechanism linkage frame 19 by pins. The anchoring mechanism linkage 19, the anchoring mechanism linkage 17, and the sawtooth support plate 18 are connected by pins. The anchoring mechanism linkage 17 is connected to the unthreaded side of the anchoring mechanism support frame 16 with internal threads by pins. The side of the outer shell 23 of the front outer anchoring mechanism near the linkage frame 19 and the anchoring mechanism support frame 20 with internal threads are fastened together by bolts.

[0019] The anchoring mechanism connecting rod 17 and the front anchoring mechanism connecting rod 19 are symmetrically connected to the lower part of the curved sawtooth support plate 18 by pins. This arrangement allows for more stable control of the contact and separation between the curved sawtooth support plate 18 and the well wall, thereby achieving the effect of smooth operation of the traction device.

[0020] The inner anchoring mechanism includes a hydraulic cylinder body 9. The base of the hydraulic cylinder body 9 and the inner anchoring mechanism housing 10 with a rectangular groove are fastened together by bolts on the side near the front outer anchoring mechanism. The inner anchor claw 12 located inside the inner anchoring mechanism housing 10 with a rectangular groove is engaged with the piston 11 with a dovetail groove and the inner anchoring mechanism housing 10 with a rectangular groove. The inner anchor claw 12 slides left and right along the direction of the central tube 13 located at the center of the traction device and penetrating the entire traction device in the piston 11 with a dovetail groove and the inner anchoring mechanism housing 10 with a rectangular groove. The inner anchor claw 12 can complete the tightening process of the central tube 13.

[0021] The anchoring mechanism support frame 8 and the hydraulic cylinder body 9 are located between the front outer anchoring mechanism and the inner anchoring mechanism.

[0022] The inner anchor claw 12 is a wedge-shaped three-claw structure. The inner anchor claw 12 is located between the inner anchoring mechanism housing 10 with a rectangular sliding groove and the piston 11 with a dovetail sliding groove. It is used to ensure that the inner anchor claw 12 does not deviate during operation. The three-claw design allows the inner anchor claw 12 to clamp the central tube 13 more firmly.

[0023] The telescopic mechanism includes a telescopic cylinder piston 14. The threaded side of the telescopic cylinder piston 14 is connected to the inner anchoring mechanism housing 10 with a rectangular slide groove via threads. The base of the telescopic cylinder body 15 is connected to the left end of the rear outer anchoring mechanism housing 23 via threads.

[0024] The piston rod length of the telescopic cylinder piston 14 and the cavity length of the telescopic cylinder body 15 are longer than those of the hydraulic cylinders of the front and rear outer anchoring mechanisms. This design can increase the single traction distance of the traction device, and its position is located in the middle of the traction device. This design is conducive to the traction device being more stable during the traction process.

[0025] The serrated support plate is powered by a hydraulic system, which includes an electric motor 27. The electric motor 27 controls the hydraulic pump 26 to draw hydraulic oil from the oil tank 24. The hydraulic oil flows through the oil filter 15 and the check valve 30 to the Y-type three-position four-way solenoid valve 31, Y-type three-position four-way solenoid valve 32, Y-type three-position four-way solenoid valve 34 and O-type three-position four-way solenoid valve 33.

[0026] The Y-type three-position four-way solenoid directional valve 31 controls the clamping and loosening of the front outer anchoring mechanism on the well wall by controlling the hydraulic cylinder 35; the Y-type three-position four-way solenoid directional valve 32 controls the clamping and loosening of the inner anchoring mechanism on the central tube by controlling the hydraulic cylinder 36; the O-type three-position four-way solenoid directional valve 33 controls the movement of the main telescopic mechanism by controlling the hydraulic cylinder 37; and the Y-type three-position four-way solenoid directional valve 34 controls the clamping and loosening of the rear outer anchoring mechanism on the well wall by controlling the hydraulic cylinder 38. The accumulator 29 serves as an auxiliary energy source to compensate for the time consumed by the start and stop of the motor 27, thereby accelerating the traction speed.

[0027] The beneficial effects of this invention are:

[0028] This invention enables the delivery of logging instruments to designated locations for operation, featuring high traction force, strong downhole adaptability, and high obstacle-crossing capability; it overcomes the difficulty of long-distance delivery of logging instruments.

[0029] This internal and external double-anchored traction device has a simple structure and novel design. During operation, it uses hydraulic power and controls the front and rear serrated support plates to adhere to the well wall through the hydraulic pressure provided by the control system, which can provide a large traction force.

[0030] This invention provides bidirectional traction. The use of a three-position four-way electromagnetic directional valve simplifies the hydraulic circuit. At the same time, the addition of an accumulator compensates for the slow start and stop of the motor, speeds up the traction, and greatly simplifies the structure of the traction device, making it adaptable to various downhole structures.

[0031] The hydraulic cylinder piston of this invention features three dovetail grooves arranged in a 120° circumference at one end. Correspondingly, the outer shell and piston rod have three guide grooves also arranged in a 120° circumference. Three inner anchor claws are positioned in the gap between the dovetail groove at the piston rod end and the guide grooves on the outer shell. The gap between the grooves restricts the freedom of the inner anchor claws, preventing positional displacement and ensuring they clamp the central tube only along its direction. The clamping plate is designed as a long, serrated curved surface. The curved surface increases the base area with the well wall, thus increasing friction. The serrations prevent slippage due to the uneven surface of the well wall. When encountering obstacles, the anchor claws retract to adapt to changes in the well diameter, significantly improving the obstacle-crossing ability of the traction device. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the front external anchoring structure.

[0034] Figure 3 This is a schematic diagram of the internal anchoring structure.

[0035] Figure 4 A schematic diagram of the main telescopic structure.

[0036] Figure 5 This is a schematic diagram of the rear external anchoring structure.

[0037] Figure 6 This is a schematic diagram of the external clamping plate structure.

[0038] Figure 7 This is a schematic diagram of the front and rear anchor claw structures.

[0039] Figure 8 This is a schematic diagram of the internal anchoring structure.

[0040] Figure 9 This is a schematic diagram of the inner anchor claw structure.

[0041] Figure 10 This is a schematic diagram illustrating the principle of motion.

[0042] Figure 11 This is a control diagram for the liquid inlet and outlet of the liquid cylinder. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings.

[0044] Reference Figure 1 As shown, a hydraulic telescopic coiled tubing traction device with internal and external double anchoring consists of four parts: a front external anchoring mechanism, a rear external anchoring mechanism, an internal anchoring mechanism, and a telescopic mechanism.

[0045] Reference Figure 2 As shown, the front external anchoring mechanism comprises eight parts: a hydraulic cylinder body 1, a front anchoring mechanism housing 2, a hydraulic cylinder piston 3, a front anchoring mechanism support frame 4, a front anchoring mechanism connecting rod 5, a front anchoring mechanism connecting rod 7, a curved sawtooth support plate 6, and the front anchoring mechanism support frame 4. The left end of the hydraulic cylinder body 1 is connected to the front anchoring mechanism housing 2 by bolts. The front anchoring mechanism connecting rods 5 and 7 are connected to the curved sawtooth support plate 6 by pins. The left end of the front anchoring mechanism support frame 4 is threaded to the right end of the hydraulic cylinder piston 3. The front anchoring mechanism support frame 4 can extend or retract as the hydraulic cylinder piston 3 slides left and right along the central tube 13 of the hydraulic cylinder body 1, providing support. The curved surface design of the serrated support plate 6 allows the support plate to fit more tightly against the well wall. The serrated design can prevent the support plate from not fitting tightly against the well wall due to damage to the well wall. The anchoring mechanism connecting rods 5 and 7 are symmetrically connected to the bottom of the curved serrated support plate 6 by pins, which can make the process of the curved serrated support plate 6 approaching the well wall more stable.

[0046] Reference Figure 3 As shown, the inner anchoring mechanism comprises five parts: a hydraulic cylinder body 9, a housing 10 with a rectangular slide groove, an inner anchor claw 12, a piston 11 with a dovetail slide groove, and a central tube 13.

[0047] The hydraulic cylinder body 9 and the housing 10 with a rectangular slide groove are fastened together by bolts and connected to the front outer anchoring mechanism by bolts. The inner anchor claw 12, the housing 10 with a rectangular slide groove, and the piston 11 with a dovetail slide groove are interlocked. The piston 11 with the dovetail slide groove drives the inner anchor claw 12 to move left and right along the slide groove of the rectangular slide groove housing 10 in the direction of the central tube 13 to clamp the central tube. The right end of the housing 10 with a rectangular slide groove is connected to the right end of the piston 14 of the main telescopic mechanism by threads. The inner anchor claw 12, located between the housing 10 with a rectangular slide groove and the piston 11 with a dovetail slide groove, restricts the movement of the inner anchor claw 12 to ensure that it only moves upward in the direction of the central tube 13 through the channel formed between the two. The surface of the inner anchor claw 12 is also designed with a curved sawtooth shape to clamp the central tube 13 more securely.

[0048] Reference Figure 4 As shown, the main telescopic mechanism includes a telescopic cylinder piston 14 and a telescopic cylinder body 15. The left end of the telescopic cylinder piston 14 and the right end of the telescopic cylinder body 15 are respectively connected by threads to the right end of the inner anchoring mechanism's outer shell 10 with a rectangular sliding groove and the support frame 16 of the rear anchoring mechanism. The telescopic cylinder piston 14 and the telescopic cylinder body 15 are used to complete the traction work of the traction device. Compared with other piston cylinders, their structural design has a larger volume, which can increase the working stroke of the telescopic cylinder piston 14, thereby increasing the single traction distance of the traction device.

[0049] Reference Figure 5As shown, the rear anchoring mechanism comprises eight parts: a hydraulic cylinder body 22, a rear anchoring mechanism housing 23, a hydraulic cylinder piston 21, an anchoring mechanism support frame 16, an anchoring mechanism support frame 20, an anchoring mechanism connecting rod 17, an anchoring mechanism connecting rod 19, and a curved sawtooth support plate 18. The right end of the hydraulic cylinder body 22 is connected to the rear anchoring mechanism housing 23 by bolts. The left end of the support frame 16 is connected to the main telescopic cylinder body 15 by threads. The right end of the support frame 16 is connected to the connecting rod 17 by a pin. The left end of the support frame 20 is connected to the connecting rod 19 by a pin. The right end of the support frame 20 is connected to the hydraulic cylinder piston 21 by threads. The connecting rods 17 and 19 are connected to the sawtooth support plate 18 by pins. The connecting rod 19 can control the opening and closing of the rear anchoring mechanism by moving the hydraulic cylinder piston 21 left and right along the central tube 13, thus providing support.

[0050] Reference Figure 6 As shown, the curved sawtooth support plate has a 60° trapezoidal tooth on its surface, which can closely fit the pipe wall to generate greater friction and thus improve the traction force of the traction device.

[0051] Reference Figure 7 As shown, the front and rear anchor claws serve to grip and prevent slippage during movement.

[0052] Reference Figure 8 As shown in the schematic diagram of the internal anchoring mechanism, the design of the dovetail groove and slider can improve the clamping force on the central tube, thereby improving the traction capacity of the traction device.

[0053] Reference Figure 9 As shown in the schematic diagram, the inner anchor claw is designed with a serrated curved surface structure, which can increase the friction between the inner anchor claw and the central tube.

[0054] Reference Figure 11 As shown in the schematic diagram of the hydraulic system, the electric motor 27 controls the hydraulic pump 26 to draw hydraulic oil from the oil tank 24. The hydraulic oil flows through the oil filter 15 and the check valve 30 to the Y-type three-position four-way solenoid valves 31, 32, 34, and 33. The Y-type three-position four-way solenoid valve 31 controls the clamping and loosening of the front outer anchoring mechanism on the well wall by controlling the hydraulic cylinder 35; the Y-type three-position four-way solenoid valve 32 controls the clamping and loosening of the inner anchoring mechanism on the central tube by controlling the hydraulic cylinder 36; the O-type three-position four-way solenoid valve 33 controls the movement of the main telescopic mechanism by controlling the hydraulic cylinder 37; and the Y-type three-position four-way solenoid valve 34 controls the clamping and loosening of the rear outer anchoring mechanism on the well wall by controlling the hydraulic cylinder 38. The accumulator 29 serves as an auxiliary energy source to compensate for the time consumed by the motor starting and stopping, thereby accelerating the traction speed.

[0055] Working principle of the invention:

[0056] Reference Figure 10 As shown in Figure (1), the hydraulic cylinder body 9 of the inner anchoring mechanism has an oil inlet at port f and an oil outlet at port e. The piston 11 with a dovetail groove pushes the inner anchoring claw 12 located between the inner anchoring mechanism housing 10 with a rectangular groove and the piston 11 with a dovetail groove under the action of hydraulic oil, clamping the central tube 13. The traction robot is in the initial state. Figure (2) The hydraulic cylinder body 22 of the rear anchoring mechanism has an oil inlet at port a and an oil outlet at port b. The hydraulic cylinder piston 21 pushes the anchoring mechanism connecting rod frame 19, causing the anchoring mechanism connecting rod 17 to open and push against the sawtooth support plate 18 to act on the well wall and clamp the well wall. Figure (3) The main telescopic cylinder body 15 has an oil inlet at port c and an oil outlet at port d. The telescopic cylinder piston 14 pushes the anchoring mechanism and the front anchoring mechanism in the central tube to move forward. Figure (4) The hydraulic cylinder body of the front anchoring mechanism has oil inlet at port 1h and oil outlet at port g. The hydraulic cylinder piston 3 pushes the anchoring mechanism connecting rod frame 4, which drives the anchoring mechanism connecting rod 5 to open and push against the sawtooth support plate 6 to clamp the well wall. Figure (5) The hydraulic cylinder body of the rear anchoring mechanism has oil inlet at port 22b and oil outlet at port a. The hydraulic cylinder piston 21 pulls the anchoring mechanism connecting rod frame 19, which drives the anchoring mechanism connecting rod 17 to separate the sawtooth support plate from the well wall. The rear anchoring mechanism is in a relaxed state. Figure (6) The main telescopic cylinder body has oil inlet at port 15d and oil outlet at port c. The hydraulic system pushes the main telescopic cylinder body forward. In Figure (7), the hydraulic cylinder body 22a of the rear anchoring mechanism receives oil and discharges oil through port b. The hydraulic cylinder piston 21 pushes the anchoring mechanism connecting rod frame 19, causing the anchoring mechanism connecting rod 17 to open and push against the sawtooth support plate 18 to clamp the well wall. The hydraulic cylinder body 1h of the front anchoring mechanism receives oil and discharges oil through port g. The hydraulic cylinder piston pulls the anchoring mechanism connecting rod frame 4, causing the anchoring mechanism connecting rod 5 to separate the sawtooth support plate 6 from the well wall, with the front end in a relaxed state. This achieves the traction function and completes one traction cycle.

Claims

1. A hydraulic telescopic traction device with internal and external double anchoring, characterized in that, It includes a front external anchoring mechanism, a rear external anchoring mechanism, a serrated support plate, an internal anchoring mechanism, and a telescopic mechanism; The front outer anchoring mechanism is used to fix the traction device and the well wall, and to provide fixed support during movement to prevent slippage. The rear external anchoring mechanism is used to fix the traction device and the well wall, and to provide fixed support during movement to prevent slippage. The inner anchoring mechanism is used to clamp the central tube; The serrated support plate is used to increase the friction between the anchoring mechanism and the well wall, to prevent slippage during movement and to provide greater traction. The telescopic mechanism is used to coordinate with the movement of the front outer anchoring mechanism and the rear outer anchoring mechanism to control the forward and backward movement of the traction device; The rear external anchoring mechanism includes a hydraulic cylinder body (22) of the rear external anchoring mechanism. The base of the hydraulic cylinder body (22) and the rear end of the outer shell (23) of the rear external anchoring mechanism are fastened together by bolts. The threaded side of the hydraulic cylinder piston (21) with external threads located inside the hydraulic cylinder body (22) of the rear external anchoring mechanism is connected to the threaded side of the anchoring mechanism support frame (20) with internal threads by threads. The anchoring mechanism support frame (16) with internal threads is... The unthreaded side of the anchoring mechanism link frame (19) is connected to the link of the anchoring mechanism link frame (19) by a pin. The anchoring mechanism link frame (19), the anchoring mechanism link (17) and the sawtooth support plate (18) are connected by pins. The anchoring mechanism link (17) is connected to the unthreaded side of the anchoring mechanism support frame (16) with internal threads by a pin. The side of the rear outer anchoring mechanism housing (23) near the link frame (19) and the anchoring mechanism support frame (20) with internal threads are fastened together by bolts. The anchoring mechanism connecting rod (17) and the anchoring mechanism connecting rod frame (19) are symmetrically connected to the bottom of the curved sawtooth support plate (18) by pins; The serrated support plate is powered by a hydraulic system, which includes an electric motor (27). The electric motor (27) controls the hydraulic pump (26) to draw hydraulic oil from the oil tank (24). The hydraulic oil flows through the oil filter and the check valve (30) to the Y-type three-position four-way solenoid valve one (31), the Y-type three-position four-way solenoid valve two (32), the Y-type three-position four-way solenoid valve three (34) and the O-type three-position four-way solenoid valve four (33). The Y-type three-position four-way solenoid valve one (31) controls the clamping and loosening of the front outer anchoring mechanism on the well wall by controlling the hydraulic cylinder one (35); the Y-type three-position four-way solenoid valve two (32) controls the clamping and loosening of the inner anchoring mechanism on the central tube by controlling the hydraulic cylinder two (36); the O-type three-position four-way solenoid valve four (33) controls the movement of the telescopic mechanism by controlling the hydraulic cylinder three (37); the Y-type three-position four-way solenoid valve three (34) controls the clamping and loosening of the rear outer anchoring mechanism on the well wall by controlling the hydraulic cylinder four (38); the accumulator (29) serves as an auxiliary energy source to compensate for the time consumed by the start and stop of the motor (27), thereby accelerating the traction speed; The curved sawtooth support plate has a 60° trapezoidal tooth on its surface, which can fit tightly against the pipe wall to generate greater friction and thus improve the traction force of the traction device. The inner anchoring mechanism includes a hydraulic cylinder body (9), the base of the hydraulic cylinder body (9) and the inner anchoring mechanism housing (10) with a rectangular groove are fastened together by bolts on the side near the front outer anchoring mechanism. The inner anchor claw (12) located inside the inner anchoring mechanism housing (10) with a rectangular groove is connected to the piston (11) with a dovetail groove and the inner anchoring mechanism housing (10) with a rectangular groove. The inner anchor claw (12) slides left and right along the direction of the central tube (13) located at the center of the traction device and penetrating the entire traction device, and the inner anchor claw (12) can complete the clamping process of the central tube (13).

2. The hydraulic telescopic traction device with internal and external double anchoring according to claim 1, characterized in that, The front outer anchoring mechanism, rear outer anchoring mechanism, inner anchoring mechanism, and telescopic mechanism are sequentially connected by threads to form the entire traction device; the telescopic mechanism and control system are used to complete the traction action; The control system is used to control the reversing valve to control the inlet and outlet of the hydraulic cylinder, thereby controlling the opening and closing of the front and rear outer anchoring mechanisms to clamp the pipe wall, and controlling the opening and closing of the anchor claws of the inner anchoring mechanism to complete the clamping of the central pipe.

3. The hydraulic telescopic traction device with internal and external double anchoring according to claim 1, characterized in that, The front outer anchoring mechanism includes a front anchoring mechanism hydraulic cylinder body (1), which is fixed to the inside of the front outer anchoring mechanism housing (2) by rivets; The base of the hydraulic cylinder body (1) of the front anchoring mechanism and the front end of the outer shell (2) of the front anchoring mechanism are fastened together by bolts. The piston rod of the hydraulic cylinder piston (3) with external threads is located inside the hydraulic cylinder body (1) of the front anchoring mechanism and the threaded side of the anchoring mechanism support frame (4) with internal threads is connected by threads. The unthreaded side of the anchoring mechanism support frame (4) with internal threads is connected to the connecting rod of the front anchoring mechanism connecting rod frame (5) by pins. The front anchoring mechanism connecting rod frame (5), the front anchoring mechanism connecting rod (7) and the curved sawtooth support plate (6) are connected by pins. The front anchoring mechanism connecting rod (7) is connected to the unthreaded side of the anchoring mechanism support frame (4) with internal threads by pins. The rear end of the outer shell (2) of the front anchoring mechanism and the anchoring mechanism support frame (8) with internal threads are fastened together by bolts.

4. The hydraulic telescopic traction device with internal and external double anchoring according to claim 3, characterized in that, The front anchoring mechanism link frame (5) and the front anchoring mechanism link (7) are symmetrically connected to the bottom of the curved sawtooth support plate (6) by pins.

5. The hydraulic telescopic traction device with internal and external double anchoring according to claim 1, characterized in that, The anchoring mechanism support frame (8) and the hydraulic cylinder body (9) are located between the front outer anchoring mechanism and the inner anchoring mechanism; The inner anchor claw (12) is a wedge-shaped three-claw structure. The inner anchor claw (12) is located between the inner anchoring mechanism housing (10) with a rectangular groove and the piston (11) with a dovetail groove. It is used to ensure that the inner anchor claw (12) does not deviate during operation. The three-claw design allows the inner anchor claw (12) to clamp the central tube (13) more firmly.

6. The hydraulic telescopic traction device with internal and external double anchoring according to claim 1, characterized in that, The telescopic mechanism includes a telescopic cylinder piston (14), the threaded side of which is connected to the inner anchoring mechanism housing (10) with a rectangular groove by means of threads, and the base of the telescopic cylinder body (15) is connected to the left end of the rear outer anchoring mechanism housing (23) by means of threads.

Images