Tubular heat exchanger tube box disassembling and assembling tool

Abstract

The utility model belongs to the field of chemical equipment, and relates to a tubular heat exchanger tube box dismounting tool, which comprises a track and a movable workbench mounted on the track, the surface of the workbench is vertically and fixedly connected with a mounting rack, and a bearing claw mechanism is mounted on the mounting rack; the bearing claw mechanism comprises a lifting frame, the lifting frame is slidably connected to the front side of the mounting frame, two bearing claws are mounted on the front side of the lifting frame, a plurality of tube box supporting seats are slidably connected to each bearing claw, and first fixing seats are fixedly connected to the tube box supporting seats. The two ends of the first safety rope are fixed to the first fixing bases on the two bearing claws respectively. A safe, efficient and convenient dismounting and mounting environment is provided for dismounting and remounting the end socket and the tube box flange.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical equipment relates to a pipe heat exchanger pipe box dismounting frock. BACKGROUND

[0002] The current pipe heat exchanger head dismounting operation mainly relies on crane or hand chain block to hoist integrally to carry out bolt dismounting, but the influence of the friction and the collision between the head and the heat exchanger pipe box on the flange gasket is often ignored in this process.In addition, due to the lack of attention to the control of the equipment gravity, the equipment may tip over due to unstable gravity when dismounting, causing safety hazards.Meanwhile, it is difficult to accurately control the position and angle when using the crane to butt joint the flange and the pipeline, and the operation is inconvenient.Therefore, there is a need to improve the pipe heat exchanger head dismounting operation mode to provide a safe, efficient and convenient dismounting and mounting environment for the head and the pipe box flange. SUMMARY

[0003] The utility model discloses a pipe heat exchanger pipe box dismounting frock, and the utility model discloses a safe, efficient, convenient dismounting, mounting environment is provided for the head and the pipe box flange of dismounting and mounting.

[0004] The utility model discloses a pipe heat exchanger pipe box dismounting frock, and the utility model discloses a safe, efficient, convenient dismounting, mounting environment is provided for the head and the pipe box flange of dismounting and mounting.

[0005] The load bearing claw mechanism includes a lifting frame, the lifting frame is slidably connected to the front side of the mounting frame, and two load bearing claws are installed on the front side of the lifting frame, a plurality of pipe box support seats are slidably connected to each load bearing claw, a first fixing seat is fixed to the pipe box support seat, and the two ends of a first safety rope are fixed to the first fixing seats on the two load bearing claws.

[0006] The utility model discloses a pipe heat exchanger pipe box dismounting frock, and the utility model discloses a safe, efficient, convenient dismounting, mounting environment is provided for the head and the pipe box flange of dismounting and mounting.

[0007] Further, the front end of the rail is provided with a clamping mechanism, the clamping mechanism includes a sliding rail and a sliding block installed on the sliding rail, and the top end of the sliding block is hinged with a hydraulic clamp for fixing the shell flange of the pipe heat exchanger.

[0008] Further, the front end of the rail is provided with a clamping mechanism, the clamping mechanism includes a sliding rail and a sliding block installed on the sliding rail, and the top end of the sliding block is hinged with a hydraulic clamp for fixing the shell flange of the pipe heat exchanger.

[0009] Further, the inner wall of the mounting frame is longitudinally provided with a sliding groove, the sidewall of the lifting frame is provided with a pulley mechanism, and the pulley mechanism is slidably connected in the sliding groove.

[0010] The pulley mechanism comprises a first pulley plate and a second pulley plate, the first pulley plate and the second pulley plate are vertically fixed on the side wall of the lifting frame, and the first pulley plate and the second pulley plate are close to the two sides of the mounting frame.

[0011] A first pulley is mounted on the surface of the first pulley plate, and a second pulley is mounted on the surface of the second pulley plate, the first pulley plate slides along the side wall of the mounting frame, and the second pulley plate slides along the sliding groove.

[0012] Further, a first guide plate is vertically arranged on the upper surface of the lifting frame along the longitudinal direction, a guide block is slidably mounted on the first guide plate, a second guide plate is vertically arranged on the bottom surface of the lifting frame along the longitudinal direction, and a guide wheel is slidably mounted on the second guide plate, and the guide block and the guide wheel are fixedly mounted on the rear side wall of the load bearing claw.

[0013] Further, a locking mechanism is arranged at the top end of the first guide plate, the locking mechanism comprises a limiting groove uniformly arranged at the top end of the first guide plate, a channel is vertically arranged in the guide block, when the guide block is locked, the bottom end of the channel is located above the guide groove and communicates with the guide groove, a positioning pin is arranged in the channel, and the bottom end of the positioning pin is inserted into the limiting groove.

[0014] Further, the hydraulic driving mechanism comprises a hydraulic oil tank, the hydraulic oil tank is connected with the first hydraulic cylinder through a pipeline, an installation table is arranged on the workbench, the first hydraulic cylinder is arranged on the top of the installation table, a driving rod is horizontally fixed at the top end of the hydraulic rod of the first hydraulic cylinder, first gears are arranged at the two ends of the driving rod, the gears are engaged with a driving chain, one end of the driving chain is fixed on the surface of the workbench, and the other end is fixed on the side wall of the lifting frame.

[0015] Further, the hydraulic driving mechanism further comprises a second hydraulic cylinder, the hydraulic oil tank is connected with the second hydraulic cylinder through a pipeline, a cavity is arranged at the front end of the track, the second hydraulic cylinder is arranged in the cavity, and the hydraulic rod of the second hydraulic cylinder is fixedly connected with a sliding block.

[0016] Further, the hydraulic driving mechanism further comprises two hydraulic motors, the hydraulic oil tank is connected with the hydraulic motors through a pipeline, the hydraulic motors are arranged at the top corners of the workbench, the output shafts of the hydraulic motors are fixedly connected with second gears, a rack is arranged on the inner edge of the track, and the rack is connected with the second gears in a meshing mode.

[0017] The beneficial effects of the utility model lie in:

[0018] 1. This utility model uses a pipe box support to support the end cap. The first fixed seat is pre-installed with a first safety rope, which can fix the end cap on the pipe box support. This avoids equipment tipping accidents caused by the weight difference between the end cap and the pipe box flange during the disassembly process, and at the same time provides convenience for removing the screws on the flange.

[0019] 2. This utility model uses hydraulic equipment when reinstalling flanges. Under the action of the hydraulic drive mechanism, the load-bearing claws accurately connect the end cap and the pipe box bundle flange, which solves the problem of excessive difficulty in traditional crane flange reinstallation operations and greatly reduces operating costs.

[0020] 3. Compared with crane hoist lifting, this utility model greatly simplifies mechanical equipment and saves time and costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a partial front view of the present invention;

[0024] Figure 3 This is a schematic diagram of the clamping mechanism of this utility model;

[0025] Figure 4 This is a schematic diagram of the load-bearing claw mechanism of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the hydraulic motor of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the first hydraulic cylinder of this utility model;

[0028] Figure 7 This is a cross-sectional view of the guide block of this utility model;

[0029] In the figure, 1, track, 2, workbench, 3, support wheel, 4, mounting frame, 5, load pawl mechanism, 51, lifting frame, 52, load pawl, 53, tube box support seat, 54, first fixing seat, 55, first safety rope, 561, first pulley plate, 562, second pulley plate, 563, first pulley, 564, second pulley, 6, clamping mechanism, 61, sliding rail, 62, sliding block, 63, hydraulic clamp, 64, second fixing seat, 65, second safety rope, 7, first guide plate, 8, second guide plate, 9, guide block, 10, guide wheel, 11, positioning pin, 12, hydraulic drive mechanism, 121, hydraulic oil tank, 122, first hydraulic cylinder, 123, second hydraulic cylinder, 124, hydraulic motor, 125, mounting table, 126, drive rod, 127, first gear, 128, drive chain, 129, second gear, 1210, rack, 13, limiting groove, 14, channel. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0031] The drawings in the utility model will be combined below Figure 1 to the drawings in the utility model will be combined below Figure 7 and specific embodiments, the utility model is discussed in detail:

[0032] A tube heat exchanger tube box dismounting tool, referring to Figure 1 , 2 , including track 1 and the workbench 2 moving on the track 1, the workbench 2 is considered as front to the heat exchanger head moving direction, and vice versa. The surface of the workbench 2 is vertically fixed with mounting frame 4, and the mounting frame 4 is a rectangular frame. The load pawl mechanism 5 is installed on the mounting frame 4. The track 1 is fixed with a hanging bracket, and the top end of the hanging bracket is provided with an ear. The crane lifts the hanging bracket to move the whole tool to the work site.

[0033] The load pawl mechanism 5 includes lifting frame 51, and the lifting frame 51 is an X-shaped frame. The lifting frame 51 is slidingly connected to the front side of the mounting frame 4. Two load pawls 52 are installed on the front side of the lifting frame 51. The load pawl 52 is an L-shaped plate body. A plurality of tube box support seats 53 are slidingly connected to each load pawl 52. The contact surface of the tube box support seat 53 and the heat exchanger head or the pipeline is a curved surface, which is more fitted to the head and the tube box flange. The rear side of the tube box support seat 53 is fixed with a first fixing seat 54, and the two ends of the first safety rope 55 are fixed on the first fixing seat 54 of the two load pawls 52.

[0034] Pipe box support seat 53 supports the head and pipe box flange, the first fixed seat 54 is preloaded with the first safety rope 55, which can fix the pipe box flange and the head on the pipe box support seat 53, so that the workers avoid the equipment tipping accident caused by the weight difference between the head and the pipe box flange during disassembly, and provide convenience for disassembling the screws on the flange.

[0035] Reference Figure 3 The inner wall of the mounting rack 4 is longitudinally provided with a sliding groove, and the side wall of the lifting frame 51 is provided with a pulley mechanism 56 which is slidingly connected in the sliding groove.

[0036] The pulley mechanism 56 includes a first pulley plate 561 and a second pulley plate 562, which are vertically fixed to the side wall of the lifting frame 51, and the first pulley plate 561 and the second pulley plate 562 are close to the two sides of the mounting rack 4, and the pulley mechanism 56 allows the lifting frame 51 to slide up and down along the mounting rack 4.

[0037] The first pulley plate 561 is provided with a first pulley 563 on the surface, and the second pulley plate 562 is provided with a second pulley 564 on the surface, and the first pulley 563 is close to the side wall of the mounting rack 4 and slides, and the second pulley plate 562 is close to the inner wall of the sliding groove and slides.

[0038] The pipe heat exchanger pipe box dismounting tool is driven by a hydraulic drive mechanism 12, which includes a hydraulic oil tank 121, which is arranged on the table top of the workbench 2, and the inside of the hydraulic oil tank 121 is filled with hydraulic oil.

[0039] Reference Figure 4 The front end of the track 1 is provided with a clamping mechanism 6, which includes a sliding rail 61 and a sliding block 62 sliding on the sliding rail 61, and the sliding rail 61 is fixed to the front end of the track 1, and the top end of the sliding block 62 is hinged with a hydraulic clamp 63 for fixing the shell flange of the pipe heat exchanger, and the hydraulic cylinder of the hydraulic clamp 63 is communicated with the hydraulic oil tank 121.

[0040] The front end of the sliding rail 61 is fixed with a second fixed seat 64, and the two ends of the second safety rope 65 are fixed on the second fixed seat 64 at the front end of the two sliding rails 61, and the second safety rope 65 is preloaded on the second fixed seat 64, and the hydraulic clamp 63 fixes the entire pipe heat exchanger head, and the head and the pipe box are moved by the regulation of the hydraulic drive mechanism 12. After reaching the predetermined position, the head and the pipe box flange are fixed by the second safety rope 65, and then the workers can disassemble.

[0041] The hydraulic drive mechanism 12 further comprises a second hydraulic cylinder 123, the hydraulic oil tank 121 is connected to the second hydraulic cylinder 123 through two pipes, one pipe is used for the hydraulic oil tank 121 to deliver hydraulic oil to the second hydraulic cylinder 123, and the other pipe is used for recovering hydraulic oil from the second hydraulic cylinder 123 to the hydraulic oil tank 121, the front end of the track 1 is provided with a cavity, and the second hydraulic cylinder 123 is installed in the cavity, and the hydraulic rod of the second hydraulic cylinder 123 is fixedly connected with the sliding block 62.

[0042] When the pipe for delivering hydraulic oil is opened, the hydraulic oil enters the second hydraulic cylinder 123, and the hydraulic rod of the second hydraulic cylinder 123 pushes the sliding block 62 to move forward; when the pipe for recovering hydraulic oil is opened, the hydraulic rod of the second hydraulic cylinder 123 drives the sliding block 62 to move backward. The position of the sliding block 62 is adjusted by the second hydraulic cylinder 123, so that the position of the hydraulic clamp 63 is adjusted.

[0043] Reference Figure 5 The hydraulic drive mechanism 12 further comprises two hydraulic motors 124, the hydraulic oil tank 121 is connected to the hydraulic motor 124 through two pipes, one pipe is used for the hydraulic oil tank 121 to deliver hydraulic oil to the hydraulic motor 124, and the other pipe is used for recovering hydraulic oil from the hydraulic motor 124 to the hydraulic oil tank 121, the two hydraulic motors 124 are respectively installed at two top corners of the rear end of the workbench 2, the output shaft of the hydraulic motor 124 is fixedly connected with a second gear 129, and the inner edge of the track 1 is provided with a rack 1210, and the rack 1210 is in meshing connection with the second gear 129.

[0044] When the pipe for delivering hydraulic oil is opened, the hydraulic oil enters the hydraulic motor 124, the output shaft of the hydraulic motor 124 rotates, the second gear 129 moves forward along the rack 1210, and the workbench 2 moves forward; when the pipe for recovering hydraulic oil is opened, the second gear 129 moves backward along the rack 1210, and the workbench 2 moves backward.

[0045] Reference Figure 6 The hydraulic oil tank 121 is connected to the first hydraulic cylinder 122 through two pipes, one pipe is used for the hydraulic oil tank 121 to deliver hydraulic oil to the first hydraulic cylinder 122, and the other pipe is used for recovering hydraulic oil from the first hydraulic cylinder 122 to the hydraulic oil tank 121, the workbench 2 is provided with a mounting table 125, the first hydraulic cylinder 122 is installed at the top of the mounting table 125, the top end of the hydraulic rod of the first hydraulic cylinder 122 is fixedly connected with a driving rod 126, the driving rod 126 and the hydraulic rod are in T-shaped structure, the two ends of the driving rod 126 are rotatably connected with a first gear 127, the gear 127 is in meshing connection with a driving chain 128, one end of the driving chain 128 is fixedly connected to the surface of the workbench 2 vertically downward, and the other end of the driving chain 128 is fixedly connected to the side wall of the lifting frame 51 vertically downward.

[0046] When the pipeline for conveying hydraulic oil is opened, the hydraulic oil tank 121 conveys hydraulic oil to the first hydraulic cylinder 122, the hydraulic rod of the first hydraulic cylinder 122 and the driving rod 126 fixed at the top end of the hydraulic rod are lifted together, the first gear 127 starts to rotate, and the movable chain 128 pulls the lifting frame 51 to ascend, and vice versa, the lifting frame 51 descends.

[0047] The two working processes can realize the forward movement, backward movement and up-down movement of the load claws, so that the head and the tube box are stably and accurately butt-jointed with the tube bundle flange, the problem of too large operation difficulty in the traditional crane flange reassembly operation is solved, and the operation cost is greatly reduced.

[0048] Reference Figure 7 The upper surface of the lifting frame 51 is vertically provided with a first guide plate 7 along the longitudinal direction, the bottom end of a guide block 9 is provided with a limiting groove matched with the first guide plate 7, the guide block 9 is fixedly installed on the rear side wall of the load claw 52, the top end of the first guide plate 7 is inserted into the limiting groove, the guide block 9 slides along the first guide plate 7, and the first guide plate 7 and the guide block 9 form a guide structure for limiting the sliding of the load claw 52 along the lifting frame 51.

[0049] The bottom surface of the lifting frame 51 is vertically provided with a second guide plate 8 along the longitudinal direction and a guide wheel 10 installed on the second guide plate 8 and sliding along the second guide plate 8, the guide wheel 10 is fixedly installed on the rear side wall of the load claw 52, and the second guide plate 8 and the guide wheel 10 form another guide structure for also limiting the sliding of the load claw 52 along the lifting frame 51.

[0050] The two load claws 52 slide along the lifting frame 51, the two load claws 52 slide inwards to reduce the distance between the two load claws 52, and the two load claws 52 slide outwards to increase the distance between the two load claws 52.

[0051] The top end of the first guide plate 7 is provided with a locking mechanism, the locking mechanism comprises limiting grooves 13 uniformly arranged at the top end of the first guide plate 7, the guide block 9 is vertically provided with a channel 14, when the position of the guide block 9 is locked, the bottom end of the channel 14 is located directly above the limiting grooves 13 and communicates with the limiting grooves 13, a positioning pin 11 is arranged in the channel 14, the positioning pin 11 is inserted into the channel 14, the bottom end of the positioning pin 11 is inserted into the limiting grooves 13, and the position of the load claw 52 on the lifting frame 51 is fixed.

[0052] The working process of the pipe heat exchanger tube box dismounting tool provided by the utility model mainly includes the following steps:

[0053] The crane is used to move the whole tool to the working position through the lifting lugs at the top end of the lifting frame.

[0054] The position of the slider 62 on the slide rail 61 is adjusted by the second hydraulic cylinder 123 in the hydraulic drive mechanism 12, so as to adjust the position of the hydraulic clamp 63, so that the whole tube heat exchanger tube side flange can be fixed.

[0055] The head and the tube side flange are further fixed by the second safety rope 65, so as to ensure that the head does not fall due to inconsistent weight or external force during disassembly.

[0056] The hydraulic motor 124 in the hydraulic drive mechanism 12 is used to drive the workbench 2 to move forward on the track 1, so as to shorten the distance between the head and the tube side flange, until the two are in contact, and then the worker can perform the installation work; or the worker disassembles the screws on the flange, and the hydraulic motor 124 drives the workbench 2 to move backward on the track 1, so as to pull apart the distance between the two, and complete the disassembly of the head.

[0057] The first hydraulic cylinder 122 in the hydraulic drive mechanism 12 is used to drive the lifting frame 51 to rise or fall. The top end of the hydraulic rod of the first hydraulic cylinder 122 is connected with the drive chain 128 through the drive rod 126 and the first gear 127, and the other end of the drive chain 128 is fixed on the side wall of the lifting frame 51, so as to realize the up and down movement of the lifting frame 51.

[0058] According to the need, the distance between the two load claws 52 is adjusted by the guide structure composed of the first guide plate 7 and the guide block 9, and the second guide plate 8 and the guide wheel 10, so as to adapt to the head and the tube side of different sizes.

[0059] After the adjustment is completed, the positioning pin 11 is used to fix the guide block 9 in the limiting groove of the first guide plate 7, so as to fix the position of the load claw 52.

[0060] The tube side support seat 53 on the load claw 52 is used to support the head and the tube side flange, and the tube side flange and the head are further fixed on the tube side support seat 53 by the first safety rope 55, so as to ensure that the head does not fall due to inconsistent weight or external force during disassembly.

[0061] After the disassembly is completed, the various mechanisms are operated in the reverse order, so as to restore the tooling to the initial state, and prepare for the next operation or move to other work sites.

[0062] The above describes the utility model by means of specific embodiments, but it should be understood that the specific description here should not be understood as the limitation of the essence and scope of the utility model, and various modifications made by the ordinary skilled in the art after reading the above embodiments belong to the scope protected by the utility model.

Claims

1. A tube bundle dismounting tool for a tube heat exchanger, characterized in that, The utility model provides a kind of pipe heat exchanger, including track (1) and the workbench (2) installed on the track (1) movement, the surface of the workbench (2) is vertically fixed with mounting bracket (4), and the mounting bracket (4) is installed with load claw mechanism (5); The load claw mechanism (5) includes lifting frame (51), the lifting frame (51) is slidably connected in the front side of the mounting bracket (4), two load claws (52) are installed in the front side of lifting frame (51), and a plurality of pipe box support seats (53) are slidably connected on each load claw (52), the first fixed seat (54) is fixed on the pipe box support seat (53), and the two ends of the first safety rope (55) are respectively fixed on the first fixed seat (54) on two load claws (52).

2. The tube bundle dismounting tool for a tubular heat exchanger according to claim 1, characterized in that The front end of the track (1) is provided with a clamping mechanism (6), the clamping mechanism (6) includes a slide rail (61) and a sliding block (62) installed on the slide rail (61), and the top end of the sliding block (62) is hinged with a hydraulic clamp (63) for fixing the shell flange of the pipe heat exchanger.

3. The tube bundle dismounting tool for a tubular heat exchanger according to claim 2, characterized in that The front end of the slide rail (61) is fixed with a second fixed seat (64), and the two ends of the second safety rope (65) are respectively fixed on the second fixed seat (64) at the front end of the two slide rails (61).

4. The tube bundle dismounting tool according to claim 3, characterized in that The inner wall of the mounting bracket (4) is longitudinally provided with a sliding groove, and the side wall of the lifting frame (51) is provided with a pulley mechanism (56) slidably connected in the sliding groove. The pulley mechanism (56) includes a first pulley plate (561) and a second pulley plate (562), the first pulley plate (561) and the second pulley plate (562) are vertically fixed on the side wall of the lifting frame (51), and the first pulley plate (561) and the second pulley plate (562) are closely installed on both sides of the mounting bracket (4). A first pulley (563) is installed on the surface of the first pulley plate (561), a second pulley (564) is installed on the surface of the second pulley plate (562), the first pulley (563) slides closely on the side wall of the mounting bracket (4), and the second pulley plate (562) slides closely on the inner wall of the sliding groove.

5. The tube bundle dismounting tool according to claim 4, characterized in that The upper surface of the lifting frame (51) is longitudinally and vertically provided with a first guide plate (7) and a guide block (9) slidably installed on the first guide plate (7), and the bottom surface of the lifting frame (51) is longitudinally and vertically provided with a second guide plate (8) and a guide wheel (10) slidably installed on the second guide plate (8), and the guide block (9) and the guide wheel (10) are fixedly installed on the rear side wall of the load claw (52).

6. The tube bundle dismounting tool according to claim 5, characterized in that The top end of the first guide plate (7) is provided with a locking mechanism, the locking mechanism includes a limiting groove (13) uniformly provided on the top end of the first guide plate (7), the guide block (9) is vertically provided with a channel (14), when the position of the guide block (9) is locked, the bottom end of the channel (14) is located directly above and communicates with the limiting groove (13), the channel (14) is provided with a positioning pin (11), the positioning pin (11) is inserted into the channel (14), and the bottom end of the positioning pin (11) is inserted into the limiting groove (13).

7. The tube bundle dismounting tool according to claim 4, characterized in that Also include a hydraulic drive mechanism (12), the hydraulic drive mechanism (12) comprising a hydraulic tank (121), the hydraulic tank (121) is communicated with the first hydraulic cylinder (122) by pipeline, the workbench is provided with mounting table (125), the first hydraulic cylinder (122) is installed on the top of mounting table (125), the top end of the hydraulic rod of first hydraulic cylinder (122) is horizontally fixed with drive rod (126), both ends of the drive rod (126) are rotatably connected with first gear (127), the first gear (127) is engaged with drive chain (128), one end of the drive chain (128) is fixed on the surface of workbench (2), the other end is fixed on the side wall of lifting frame (51).

8. The tube bundle dismounting tool according to claim 7, characterized in that The hydraulic drive mechanism (12) further comprises a second hydraulic cylinder (123), the hydraulic tank (121) is communicated with the second hydraulic cylinder (123) by pipeline, the front end of the track (1) is provided with a cavity, the second hydraulic cylinder (123) is installed in the cavity, the hydraulic rod of second hydraulic cylinder (123) is fixedly connected with the sliding block (62).

9. The tube bundle dismounting tool according to claim 7, characterized in that The hydraulic drive mechanism (12) further comprises two hydraulic motors (124), the hydraulic tank (121) is communicated with the hydraulic motor (124) by pipeline, the hydraulic motor (124) is installed at the top corner of workbench (2), the output shaft of hydraulic motor (124) is fixedly connected with second gear (129), the inner edge of track (1) is provided with rack (1210), the rack (1210) is connected with the second gear (129) in meshing.

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