Catwalk with trolley and well repair device

Abstract

The application discloses a catwalk with a trolley and a well repairing device, and relates to the technical field of oil drilling and well repairing device, the catwalk comprises a rack, a lifting seat with a rear end hinged to the rear end of the rack, a cylinder I hinged between the rack and the lifting seat, a gear meshing type double-claw linkage pipe grabbing mechanism rotatably installed on the rack, a sliding seat slidably installed on the lifting seat, and a rear limiting type trolley slidably installed on the sliding seat, the sliding seat is a chain driven type sliding seat, and front and rear stoppers matched with the rear limiting type trolley are fixed on the chain of the sliding seat, and a length measuring limiting mechanism matched with the rear limiting type trolley is slidably installed on the front end of the rack. The application greatly improves the followability of the rear limiting type trolley and the pipe rod, and automatically and accurately realizes length measuring and limiting of the pipe rod, and finally greatly improves the overall operation efficiency and operation safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling and workover rig, in particular to a catwalk with a trolley and a workover rig. BACKGROUND

[0002] In recent years, as a kind of full-automatic or semi-automatic equipment capable of completing the reciprocating transmission of tubing and other pipe rods between the wellhead and the discharge rack, the automatic catwalk is widely used in pipe rod lifting and lowering operation. However, in the process of lifting and lowering the pipe rod, the pipe rod thread directly slides in the catwalk in the traditional automatic catwalk, which is prone to damage in the sliding process. At the same time, in order to put the pipe rod into the catwalk for transportation, the catwalk needs to switch between left and right working conditions, resulting in low efficiency of pipe rod lifting and lowering operation, and it is difficult to avoid the knocking of the pipe rod in the process of falling into the catwalk, which is prone to wear and tear, and the noise is also large. In addition, the length of each pipe rod needs to be measured during the pipe rod lowering process, and the traditional automatic catwalk cannot realize the measurement of the length of the pipe rod, and the length is usually measured by manual tape measure, which has low measurement efficiency and general accuracy, further affecting the operation efficiency and safety of the pipe rod lifting and lowering operation.

[0003] However, Chinese patent CN111894493A discloses a catwalk provided with a trolley, which discloses a pipe lifting mechanism provided with a rack, a rotary lifting drive, a connecting rod, a rotary lifting slide, a trolley, a pipe lifting drive and a sliding block drive. The pipe rod is placed in the trolley and slides in the rotary lifting slide together with the trolley, which avoids the wear and tear of the pipe rod thread caused by the direct sliding of the pipe rod thread in the rotary lifting slide, thereby effectively protecting the pipe rod thread. The pipe rod is clamped and transported into the trolley for transportation by the pipe lifting mechanism, so that the trolley does not need to switch between left and right working conditions, and the problem of knocking of the pipe rod in the process of falling into the rotary lifting slide is reduced, thereby reducing the noise.

[0004] Although the rack, the rotary lifting drive, the connecting rod, the rotary lifting slide, the trolley, the pipe lifting drive and the pipe lifting mechanism are cooperatively arranged in the prior art to protect the pipe rod thread to a certain extent, and to reduce the problem of knocking of the pipe rod in the process of falling into the rotary lifting slide to a certain extent, the prior art still has the problem of being unable to measure the length of the pipe rod automatically and accurately, and the overall operation efficiency and safety are still general. In addition, the trolley in the prior art is directly connected with the power, which cannot ensure that the trolley follows the pipe rod well, and there is a risk of disconnection between the pipe rod and the trolley, further affecting the operation safety and stability.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. SUMMARY

[0006] The present application aims to provide a catwalk with a trolley and a well repairing device to solve the technical problems of the current catwalk with a trolley, which cannot automatically and accurately measure the length of the pipe rod while protecting the pipe rod thread, reducing the need for left-right working condition switching of the trolley and the inevitable bumping of the pipe rod when falling into the catwalk, so that the overall work efficiency and work safety are still general, and the trolley cannot ensure good follow-up with the pipe rod, which may cause the pipe rod to separate from the trolley, further affecting the work safety and stability.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A catwalk with a trolley, comprising a rack, a lifting seat hingedly connected to the rear end of the rack, a gas cylinder I hingedly connected between the rack and the lifting seat, a gear meshing double-claw linkage pipe grabbing mechanism rotatably installed on the rack, a sliding seat slidably installed on the lifting seat, and a rear limiting trolley slidably installed on the sliding seat, wherein the sliding seat is a chain driven sliding seat, and a front stop block and a rear stop block matched with the rear limiting trolley are fixed on the chain of the sliding seat, and a length measuring limiting mechanism matched with the rear limiting trolley is slidably installed on the front end of the rack;

[0009] Further, the catwalk further comprises a gas cylinder II and a balance bar assembly, the bottom of the lifting seat has a D-shaped buckle, the cylinder body of the gas cylinder I is hingedly connected to the rack, the piston rod end of the gas cylinder I is connected to the buckle body of the D-shaped buckle, the balance bar assembly comprises a balance bar and a roller seat, the roller seat is located inside the lifting seat and has a moving roller III and an ear plate II on the top and the bottom respectively, one end of the balance bar is hingedly connected to the rack, the other end of the balance bar is hingedly connected to the ear plate II, the moving roller III is rollingly arranged inside the lifting seat, the sliding seat comprises a main base and a chain driving mechanism, the bottom of the main base has an ear plate I and a moving roller II, the cylinder body of the gas cylinder II is hingedly connected to the inner rear end of the lifting seat, the piston rod end of the gas cylinder II is hingedly connected to the ear plate I, and the moving roller II is rollingly arranged inside the lifting seat;

[0010] Further, the chain drive mechanism comprises chain wheels symmetrically installed on the main base, chains sleeved on the two chain wheels, and drive motors for driving the chain wheels to rotate, the rear limiting type trolley comprises a top, a support part with two open ends and in a semicircular groove shape, and a semicircular baffle integrally connected with the support part and used for sealing the rear end of the support part, support leg assemblies are fixed at the outer sides of the four corners of the support part, the support leg assemblies comprise support legs in an inverted L-shaped structure, and moving rollers I and limiting rollers installed at the lower ends of the support legs and matched with the chains, the double-claw linkage pipe grabbing mechanism comprises a pipe grabbing assembly and a turnover driving assembly for driving the pipe grabbing assembly to turn over, the turnover driving assembly comprises a cylinder III, a rack, and a driven gear engaged with the rack, the cylinder III is hinged to the bottom of the side surface of the rack, the rack is coaxially fixed to the end of the piston rod of the cylinder III, the top of the rack is rotatably arranged along the axis and supports a driven pipe parallel to the rack, the driven pipe is coaxially fixed to the gear shaft of the driven gear, the pipe grabbing assembly comprises a cylinder IV, a pipe grabbing base, and a driving claw and a driven claw simultaneously hinged to the pipe grabbing base, the pipe grabbing base is fixed to the driven pipe, the cylinder IV is hinged to the pipe grabbing base, the end of the piston rod of the cylinder IV is hinged to the driving claw, the shafts of the driving claw and the driven claw are fixed with transmission gears and the two transmission gears are engaged, the length limiting mechanism comprises a limiting seat slidably arranged at the front end of the rack and parallel to the length direction of the rack, a baffle seat is hingedly arranged upward at the end of the limiting seat away from the rack, a transverse shaft is vertically inserted into the baffle seat, a baffle is arranged between the rack and the baffle seat and parallel to the baffle seat, the transverse shaft is fixed to the side of the baffle opposite to the baffle seat and the outer side of the transverse shaft is sleeved with springs matched with the baffle, an upper connecting rod is hingedly arranged on the baffle seat, the upper connecting rod is below the baffle and the other end of the upper connecting rod is hingedly connected with the limiting seat, and a lower connecting rod is detachably hingedly arranged between the bottom of the end of the limiting seat away from the rack and the front end of the rack.

[0011] In addition to the above technical solutions, there is a well repair device with the catwalk with the self-contained trolley.

[0012] Compared with the prior art, the well repair device has the following advantages:

[0013] 1. The application is characterized in that the rear end of the lifting seat is hinged to the rear end of the frame, and the cylinder I is directly hinged between the frame and the lifting seat, so that the lifting seat can be stably lifted relative to the frame. On the lifting seat, a chain-driven sliding seat is slidably mounted, a rear-limiting trolley is slidably mounted on the sliding seat, and a front stop and a rear stop cooperating with the rear-limiting trolley are fixed on the chain of the sliding seat. On the basis that the sliding seat can advance or retreat on the lifting seat, the rear-limiting trolley is indirectly driven by the sliding seat through the cooperation of the chain, the front stop and the rear stop. The rear-limiting trolley can be well followed by the pipe rod, greatly improving the followability of the rear-limiting trolley and the pipe rod. At the same time, through the cooperation of the rear-limiting trolley and the length-limiting mechanism, the front and rear limiting of the pipe rod during the lowering process is realized. At this time, a conventional displacement sensor or other displacement detection equipment can be installed on the rear-limiting trolley. The displacement of the rear-limiting trolley is automatically detected by the displacement detection equipment, so that the length of the pipe rod can be accurately calculated. The overall work efficiency and work safety are greatly improved. After the front end of the pipe rod is limited by the length-limiting mechanism each time, it is transported to the wellhead by a set distance, which ensures that the distance from the front end of the pipe rod to the wellhead is the same each time, thereby facilitating the clamping of the pipe rod by the subsequent lifting clamp, further improving the work efficiency and work safety. In addition, the double-claw linkage pipe grabbing mechanism is set as a gear meshing type, which effectively improves the safety and stability of pipe grabbing, thereby further ensuring the overall work safety and stability.

[0014] 2. The length-limiting mechanism in the application comprises a limiting seat, a baffle seat, a baffle, a horizontal shaft, a spring, an upper connecting rod and a lower connecting rod. A conventional contact sensor or other sensing equipment can be installed between the baffle and the baffle seat. When the baffle is pushed forward by the pipe rod, it can move towards the baffle seat, thereby compressing the spring to a preset state to trigger the sensing equipment. The sensing equipment sends a sensing signal, the pipe column is limited by the length-limiting mechanism, the control system of the catwalk receives the signal, and the length of the pipe column is obtained by the displacement detection equipment. The length-limiting process of the length-limiting mechanism is accurate and fast, effectively ensuring the overall work efficiency and work safety.

[0015] 3. The pipe grabbing assembly of the double-claw linkage pipe grabbing mechanism in the application comprises a cylinder IV, a pipe grabbing seat, a driving claw and a driven claw. In the application, transmission gears are fixed on the outer sides of the shafts of the driving claw and the driven claw. The transmission gears on the driving claw and the driven claw under the action of the cylinder IV are meshed with each other, so that the driving claw and the driven claw are opened and closed, thereby effectively improving the firmness and stability of the pipe grabbing assembly and the entire double-claw linkage pipe grabbing mechanism during pipe grabbing, and further ensuring the overall work safety and stability.

[0016] 4. The balance bar assembly in the application comprises a balance bar and a roller seat, the top and bottom of the roller seat are respectively provided with a moving roller III and an ear plate II, one end of the balance bar is hinged to a rack, the other end of the balance bar is hinged to the ear plate II, the moving roller III is rolling arranged in the inner part of the lifting seat in a matching manner, the sliding installation of the balance bar on the lifting seat is realized, thereby cooperating with the cylinder I hinged between the rack and the lifting seat, the stability and safety of the lifting seat during lifting are greatly improved, thereby ensuring the overall operation safety and stability;

[0017] 5. The rear limiting type trolley in the application is composed of a top part, a support part with two open ends and in a semicircular groove shape, a semicircular baffle integrally connected with the support part and used for blocking the rear end of the support part, and four groups of support leg assemblies respectively fixed at the four corners of the outer side of the support part, the support leg assembly comprises a support leg in an inverted L-shaped structure, and a moving roller I and a limiting roller installed at the lower end of the support leg and matched with the chain, which realizes the stable movement in the conveying direction of the chain by matching the moving roller I and the limiting roller, and limits the overall operation safety and stability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The working principle of the application is shown Figure 1 ;

[0019] Figure 2 The working principle of the application is shown Figure 2 ;

[0020] Figure 3 The working principle of the chain driving mechanism of the application is shown

[0021] Figure 4 The working principle of the length measuring and limiting mechanism of the application is shown

[0022] Figure 5 The structure of the rear limiting type trolley of the application is shown

[0023] Figure 6 The structure of the pipe grabbing assembly of the application is shown

[0024] Figure 7 The structure of the overturning driving assembly of the application is shown

[0025] Figure 8 The working principle of the balance bar assembly of the application is shown

[0026] Figure 9 The connection structure of the lifting seat and the sliding seat of the application is shown

[0027] In the figure: 1, frame, 2, cylinder I, 3, lifting seat, 4, sliding seat, 41, main base, 411, ear plate I, 412, moving roller II, 42, chain wheel, 43, chain, 44, front stopper, 45, rear stopper, 46, driving motor, 5, rear limit type trolley, 51, support part, 52, semicircular baffle, 53, support leg, 54, moving roller I, 55, limit roller, 6, cylinder II, 7, cylinder III, 8, rack, 9, driven gear, 10, driven pipe, 11, cylinder IV, 12, pipe grabbing seat, 13, driving claw, 14, driven claw, 15, transmission gear, 16, limit seat, 17, baffle seat, 18, baffle, 19, horizontal shaft, 20, spring, 21, upper connecting rod, 22, lower connecting rod, 23, balance bar, 24, roller seat, 25, moving roller III, 26, ear plate II, 27, D type buckle. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely in combination with the drawings.

[0029] Example 1

[0030] Please refer to Figures 1-9It shows a catwalk with a trolley, including frame 1, cylinder I 2, lifting seat 3, sliding seat 4, rear limiting trolley 5, cylinder II 6, balance bar assembly and double claw linkage pipe grabbing mechanism (the basic structure such as the control system on the existing catwalk is not specifically described here, but the function implementation should not be limited thereby), the frame 1 is a three-dimensional frame structure, and the front end of the frame 1 is provided with a limiting seat 16 which can slide forward and backward, the limiting seat 16 is parallel to the length direction of the frame 1 and the end of the limiting seat 16 away from the frame 1 is upwardly hinged with a baffle seat 17, the frame 1 and the baffle seat 17 are provided with a baffle 18 parallel to the baffle seat 17, two horizontal shafts 19 symmetrically upward and downward are vertically inserted into the baffle seat 17, both of the horizontal shafts 19 are fixed to the side of the baffle 18 opposite to the baffle seat 17 and the outer side of both of the horizontal shafts 19 is sleeved with a spring 20 matched with the baffle 18, the baffle 18 is provided with an upper connecting rod 21 below, the upper connecting rod 21 is hinged between the limiting seat 16 and the baffle seat 17, the bottom of the end of the limiting seat 16 away from the frame 1 and the front end of the frame 1 are detachably hinged with a lower connecting rod 22, the rear end of the lifting seat 3 is hinged to the rear end of the frame 1 and the bottom of the lifting seat 3 has a D-shaped buckle 27, the cylinder body of the cylinder I 2 is hinged to the frame 1, the end of the piston rod of the cylinder I 2 is connected to the buckle of the D-shaped buckle 27, the sliding seat 4 includes a main body base 41, a chain wheel 42, a chain 43, a front stop block 44, a rear stop block 45 and a driving motor 46, the bottom of the main body base 41 has an ear plate I 411 and a moving roller II 412, the cylinder body of the cylinder II 6 is hinged to the inner rear end of the lifting seat 3, the end of the piston rod of the cylinder II 6 is hinged to the ear plate I 411, the moving roller II 412 is rollingly arranged in the inner part of the lifting seat 3, the chain wheel 42 is provided with two and symmetrically installed in the inner part of the main body base 41, the front and rear ends of the chain 43 are sleeved with two chain wheels 42 respectively, the chain wheel 42 at the rear end is coaxially and drivingly connected with the driving motor 46, the front stop block 44 and the rear stop block 45 are fixed on the chain 43 at the same time, the balance bar assembly includes a balance bar 23 and a roller seat 24, the top and bottom of the roller seat 24 are respectively provided with a moving roller III 25 and an ear plate II 26, one end of the balance bar 23 is hinged to the frame 1, the other end of the balance bar 23 is hinged to the ear plate II 26, the moving roller III 25 is also rollingly arranged in the inner part of the lifting seat 3;

[0031] Further, the rear limiting trolley 5 is composed of a supporting part 51, a semicircular baffle 52 and four supporting leg assemblies, the supporting part 51 is semicircular and has openings at the top and the front and rear ends, the semicircular baffle 52 is integrally connected to the rear end of the supporting part 51 and is vertically arranged relative to the length direction of the supporting part 51, the four supporting leg assemblies are respectively fixed to the four corners of the outer side of the supporting part 51 and each includes a supporting leg 53, a moving roller I 54 and a limiting roller 55 matched with the chain 43, the supporting leg 53 is in inverted L-shaped structure, the moving roller I 54 and the limiting roller 55 are installed at the lower end of the supporting leg 53;

[0032] Further, the double-claw linkage pipe grabbing mechanism is composed of a turnover driving assembly and a plurality of pipe grabbing assemblies. The turnover driving assembly comprises a cylinder III 7, a rack 8, a driven gear 9 and a driven pipe 10. The pipe grabbing assembly comprises a cylinder IV 11, a pipe grabbing seat 12, a driving claw 13 and a driven claw 14. The cylinder body of the cylinder III 7 is hinged to the bottom of the side of the rack 1. The rack 8 is coaxially fixed to the end of the piston rod of the cylinder III 7 and is in meshing connection with the driven gear 9. The gear shaft of the driven gear 9 and the driven pipe 10 are coaxially fixed. The driven pipe 10 is parallelly arranged on the top of the rack 1 and can rotate along the axis (a support seat can be arranged between the rack 1 and the driven pipe 10). The pipe grabbing seat 12 is suspendedly fixed to the driven pipe 10. The cylinder body of the cylinder IV 11 and the driving claw 13 and the driven claw 14 are hinged to the pipe grabbing seat 12. The end of the piston rod of the cylinder IV 11 is hinged to the driving claw 13. The outer sides of the shafts of the driving claw 13 and the driven claw 14 are fixed with transmission gears 15 and the two transmission gears 15 are in meshing cooperation.

[0033] The working flow and principle of the present application are as follows:

[0034] Pipe rod operation: first, the lifting seat 3 is lifted to the required position by the cylinder I 2, and the main base 41 of the sliding seat 4 is pushed forward to the required position together with the whole sliding seat 4 by the cylinder II 6; then, the driving motor 46 drives the chain 43 to circulate forward, the rear stop block 45 moves forward, the rear stop block 45 pushes the semicircular baffle 52 of the rear limiting type trolley 5, and the whole rear limiting type trolley 5 moves to the front end of the sliding seat 4 (the rear stop block 45 and the front stop block 44 on the chain 43 also have the function of limiting protection during the whole operation process), when the pipe column (not shown) is pressed on the rear limiting type trolley 5, the chain 43 circulates backward to drive the rear stop block 45 to move backward quickly, so that the rear limiting type trolley 5 and the pipe column can follow (when the pipe column is pushed from the wellhead to the rear end of the catwalk, the pipe column pushes the semicircular baffle 52 of the rear limiting type trolley 5 to make the rear limiting type trolley 5 retreat synchronously); then, when the pipe column moves to the coaxial position of the sliding seat 4, the sliding seat 4 is retreated to the last position by the cylinder II 6, the lifting seat 3 is lowered to the lowest position by the cylinder I 2, the cylinder III 7 pushes the rack 8 to make the driven gear 9 rotate, thereby driving the driven pipe 10 to rotate, and driving the pipe grabbing seat 12 and the whole pipe grabbing assembly to turn over to the pipe grabbing position; at this time, the cylinder IV 11 drives the driving claw 13 to rotate, and under the meshing action of the two transmission gears 15, the driven claw 14 is rotated to grab the pipe rod; finally, the cylinder III 7 pushes the rack 8 to make the driven gear 9 rotate, thereby driving the driven pipe 10 to rotate, and driving the pipe grabbing seat 12 and the whole pipe grabbing assembly to turn over to the reset position; at this time, the cylinder IV 11 drives the driving claw 13 to rotate, and under the meshing action of the two transmission gears 15, the driven claw 14 is rotated to release the pipe rod.

[0035] Lower pipe rod operation: first, the cylinder III 7 push rack 8, make driven gear 9 rotation, thus driving driven pipe 10 rotation, in turn drive pipe seat 12 and even the whole pipe grab assembly turnover to meet the pipe rod, after the cylinder IV 11 drive driving claw 13 rotation, under the meshing effect of two transmission gear 15, in turn drive driven claw 14 rotation, thus grab pipe rod; then, the cylinder III 7 push rack 8, make driven gear 9 rotation, thus driving driven pipe 10 rotation, in turn drive pipe seat 12 and even the whole pipe grab assembly turnover to slide 4, at this time, the cylinder IV 11 again drive driving claw 13 rotation, under the meshing effect of two transmission gear 15, in turn drive driven claw 14 rotation, thus release pipe rod; then, the cylinder III 7 again push rack 8, make driven gear 9 rotation, thus driving driven pipe 10 rotation, in turn drive pipe seat 12 and even the whole pipe grab assembly to reset position; finally, the rear limiting type trolley 5 use its own semicircular baffle 52 forward push pipe rod, when the pipe rod's coupling meets the baffle 18, the rear limiting type trolley 5 stop pushing pipe (in this process, the drive motor 46 drive chain 43 forward circulation, drive rear block 45 forward, the rear block 45 push the semicircular baffle 52 of rear limiting type trolley 5, in turn make the whole rear limiting type trolley 5 forward movement), at the same time, the cylinder I 2 will lift seat 3 to the required position, and the cylinder II 6 will slide seat 4's main base 41 and even the whole slide seat 4 forward push to the required position, after the pipe rod is taken away, the cylinder II 6 drive slide seat 4 retreat to the last, the cylinder I 2 will lift seat 3 to the lowest position.

[0036] In addition, the baffle 18 on the two horizontal shaft 19 between the installation of proximity sensor (normal proximity sensor and other conventional equipment of the function and structure are well known in the art, connection setting is also well known, so here is not much explained, in the drawings also not shown in detail), on the rear limiting type trolley 5 installation displacement sensor (normal displacement sensor and other conventional equipment of the function and structure are well known in the art, connection setting is also well known, so here is not much explained, in the drawings also not shown in detail), when the lower pipe rod operation, baffle 18 by the pipe rod forward thrust, will move to the direction of baffle seat 17, thus compression spring 20 to the preset state trigger proximity sensor (when the push force disappears, due to the reset action of spring, baffle 18 back to the original position), the proximity sensor sends a signal, the pipe column is limited by baffle 18, catwalk control system receives signal, through displacement sensor, the moving distance of rear limiting type trolley 5 is automatically detected, thus accurately obtain the length of the pipe rod.

[0037] Example 2:

[0038] Please see Figures 1-9As another object of the present application, there is provided a well repair work device in which the catwalk with the trolley is provided, and thus the well repair work device can obtain any of the advantageous effects of the catwalk with the trolley described above, which will not be described again.

Claims

1. A catwalk with a built-in trolley, comprising a frame and a lifting seat hinged to the rear end of the frame, characterized in that, It also includes cylinder I hinged between the frame and the lifting seat, a gear-engaged double-claw linkage pipe gripping mechanism rotatably mounted on the frame, a slide mounted on the lifting seat that can slide back and forth, and a rear limit trolley mounted on the slide that can slide back and forth. The slide is a chain-driven slide with a front stop and a rear stop fixed on its chain to cooperate with the rear limit trolley. The front end of the frame is slidably mounted with a length measuring and limiting mechanism that cooperates with the rear limit trolley. The slide includes its main body base and a chain drive mechanism. The chain drive mechanism includes sprockets symmetrically mounted on the main body base, a chain fitted on both sprockets, and a drive motor for driving the sprockets to rotate. The rear limiting trolley includes a support part with openings at the top and both ends and a semi-circular trench shape, and a semi-circular baffle integrally connected to the support part and used to seal the rear end of the support part. Support leg assemblies are fixed at the four outer corners of the support part. The support leg assembly includes a support leg with an inverted L-shaped structure, and a moving roller I and a limiting roller installed at the lower end of the support leg and cooperating with the chain. The dual-claw linkage pipe gripping mechanism includes a pipe gripping assembly and a flipping drive assembly for driving the pipe gripping assembly to flip. The flipping drive assembly includes a cylinder III, a rack, and a driven gear meshing with the rack. The cylinder body of the cylinder III is hinged to the bottom side of the frame. The rack is coaxially fixed to the end of the piston rod of the cylinder III. A driven tube parallel to the frame is rotatably mounted on the top of the frame along the axis. The driven tube is coaxially fixed to the gear shaft of the driven gear. The pipe gripping assembly includes a cylinder IV, a pipe gripping seat, and an active claw and a driven claw that are simultaneously hinged to the pipe gripping seat. The pipe gripping seat is fixed to the driven pipe. The cylinder body of the cylinder IV is hinged to the pipe gripping seat. The piston rod end of the cylinder IV is hinged to the active claw. The outer side of the shafts of the active claw and the driven claw are both fixed with transmission gears, and the two transmission gears mesh with each other. The length measuring and limiting mechanism includes a limiting seat that is slidably disposed at the front end of the frame and parallel to the length direction of the frame. A baffle seat is hinged upward at the end of the limiting seat away from the frame. A horizontal shaft is vertically inserted through the baffle seat. A baffle is provided between the frame and the baffle seat, and the baffle is parallel to the baffle seat. The horizontal shaft is fixed to the side of the baffle facing the baffle seat, and a spring that cooperates with the baffle is fitted on its outer side. An upper connecting rod is also hinged to the baffle seat. The upper connecting rod is located below the baffle, and its other end is hinged to the limiting seat. A lower connecting rod is detachably hinged between the bottom of the limiting seat away from the frame and the bottom of the front end of the frame.

2. The catwalk with a built-in trolley according to claim 1, characterized in that, The cat walkway also includes cylinder II. The bottom of the main body base has ear plate I and moving roller II. The cylinder body of cylinder II is hinged to the rear end of the inside of the lifting seat. The piston rod end of cylinder II is hinged to ear plate I. The moving roller II is rotatably disposed inside the lifting seat.

3. A catwalk with a built-in trolley according to claim 1, characterized in that, It also includes a balance bar assembly, which includes a balance bar and a roller seat. The roller seat is located inside the lifting seat and has a movable roller III and an ear plate II at its top and bottom, respectively. One end of the balance bar is hinged to the frame, and the other end of the balance bar is hinged to the ear plate II. The movable roller III is rotatably disposed inside the lifting seat.

4. A catwalk with a built-in trolley according to claim 1, characterized in that, The bottom of the lifting seat has a D-shaped buckle, the cylinder body of cylinder I is hinged to the frame, and the end of the piston rod of cylinder I is connected to the buckle body of the D-shaped buckle.

5. A well workover device, characterized in that, Including a catwalk with a built-in trolley as described in any one of claims 1-4.

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