Hydraulic support withdrawing device

Abstract

The utility model discloses a hydraulic support withdrawing device which comprises a direction adjusting platform located at a moving-in end and a main platform located at a moving-out end. The direction adjusting platform is provided with a plurality of guide rollers which are distributed in an arc shape in the direction from the moving-in end to the main platform. And a first traction group and a second traction group are respectively arranged on the direction adjusting platform and the main platform. The utility model relates to the technical field of coal mine production, can realize traction, direction adjustment and truck loading of a bracket to be withdrawn at one time, eliminates the defects of short direction adjustment distance and small rotation angle when the bracket to be withdrawn is withdrawn, and realizes perfect combination with a bracket carrier or a forklift. According to the withdrawing device, only one chain hanging worker, one equipment operator and two hydraulic support workers are needed, more than six workers are reduced, the hydraulic support can be pulled out, adjusted in direction and rotated by 90 degrees to be straightened only through three times of chain hanging in the working process, application of traditional withdrawing tools such as a winch, a single body and a manual crane is omitted, and the safety risk of operators is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mine production, specifically to a hydraulic support withdrawing device. BACKGROUND

[0002] The removal of hydraulic support equipment of fully mechanized coal mining face is an indispensable link in the process of coal mining. In the process of coal production, hydraulic support, as the main equipment for supporting the roof of the working face, plays a crucial role. However, the removal of hydraulic support occupies a dominant position in the removal of the entire working face equipment in terms of workload and difficulty.

[0003] In the prior art, there are many deficiencies in the removal method of hydraulic support. For example, the patent for invention with publication number CN112761697A only relies on the device to complete the withdrawal of the to-be-withdrawn support to the coal wall side, and cannot complete the turning and subsequent forward pushing adjustment action. This makes it still necessary to use other equipment or methods to complete the turning and forward pushing of the hydraulic support in the actual operation process, reducing the removal efficiency.

[0004] Again, the utility model patent with authorized publication number CN217599919U can complete the withdrawal, turning and forward pushing of the hydraulic support for loading operation, but cannot realize the full removal of the hydraulic support and still needs other equipment to assist in completing part of the removal work.

[0005] In addition, the technology with authorized publication number CN221347003U also has limitations and can only complete the withdrawal of the hydraulic support, but cannot realize full removal. The patent for invention with publication number CN117759308A is mainly used for the installation of the along-hill support and cannot be used for withdrawal, and does not have the turning function.

[0006] In summary, the prior art solutions have the following problems in the removal of hydraulic support: first, they cannot rely on a set of device to complete all actions of the removal of hydraulic support at one time; second, they cannot completely eliminate the use of winch and steel wire rope for turning and dragging operation, resulting in a large safety hazard in the construction process. UTILITY MODEL CONTENT

[0007] In view of the deficiencies of the prior art, the utility model provides a hydraulic support withdrawing device, which solves the problems of the prior art that the existing hydraulic support withdrawing device cannot complete the removal of hydraulic support at one time and has a large safety hazard in the construction process.

[0008] To achieve the above object, the utility model discloses a hydraulic support withdrawing device, including a plurality of to be removed support and the withdrawing device of arranging along the direction of to be removed support, the withdrawing device includes the direction adjusting platform of moving into end and the main platform of moving out end, be provided with a plurality of guide rollers of arc line shape distribution along the direction of moving into end to main platform on the direction adjusting platform,

[0009] First traction group and second traction group are respectively arranged on the direction adjusting platform and main platform,

[0010] The first traction group includes the pull frame mechanism, the pull frame mechanism includes pull frame oil cylinder and first pull chain, and the pull frame oil cylinder drives the first pull chain to retract and displace, and the to-be-withdrawn support is pulled to the direction adjusting platform along the entering end and is guided preliminarily,

[0011] The second traction group includes right cantilever oil cylinder and left cantilever oil cylinder and two second pull chains, and the output end and bottom end of the right cantilever oil cylinder and left cantilever oil cylinder are respectively provided with second guide sprocket and chain storage sprocket, one end of the two second pull chains is fixed on the chain storage sprocket, and the other end is a hooking end and is lapped on the guide sprocket,

[0012] When the hooking end of the second pull chain on the right cantilever oil cylinder is hooked on the to-be-withdrawn support, the right cantilever oil cylinder promotes the to-be-withdrawn support to be guided on the direction adjusting platform in the second step, and when the hooking end of the pull chain on the right cantilever oil cylinder and left cantilever oil cylinder is hooked on the to-be-withdrawn support, the right cantilever oil cylinder and left cantilever oil cylinder promote the to-be-withdrawn support to be removed from the moving out end,

[0013] Preferably, the pull frame mechanism further includes a pull frame body, the pull frame oil cylinder is arranged in the pull frame body, the pull frame oil cylinder includes pull frame oil cylinder one and pull frame oil cylinder two, one end of the first pull chain is fixed on the output end of the pull frame oil cylinder one, the output end of the pull frame oil cylinder two is provided with a first guide sprocket, and the first pull chain is lapped on the first guide sprocket.

[0014] Preferably, a slide is arranged on the pull frame body in the advancing direction of the pull frame oil cylinder one and pull frame oil cylinder two, the output end of the pull frame oil cylinder two is fixed with a sliding block, the sliding block is slidably connected on the slide, and the first guide sprocket is rotatably connected on the sliding block.

[0015] Preferably, the guide roller includes:

[0016] A fixed seat is fixed on the direction adjusting platform,

[0017] A link pin shaft is inserted into and fixed in the fixed seat at one end and extends out of the fixed seat at the other end,

[0018] A rotating sleeve is rotatably connected on the link pin shaft.

[0019] Preferably, the outer edge of the direction adjusting platform is provided with a deflection adjusting oil cylinder close to one side of the main platform, and the fixed end of the deflection adjusting oil cylinder is hinged to the direction adjusting platform.

[0020] Preferably, an upper rack inclined platform fixed to the direction adjusting platform is arranged at the moving-in end of the withdrawing device.

[0021] Preferably, a lower rack inclined platform fixed to the main platform is arranged at the moving-out end of the withdrawing device.

[0022] Preferably, a shield support is arranged on the side of the direction adjusting platform away from the main platform, the front end of the shield support is provided with a shield support pushing oil cylinder, the output end of the shield support pushing oil cylinder is fixed to one end of a pushing cross beam, and the other end of the pushing cross beam is connected to the direction adjusting platform through a striding connecting mechanism.

[0023] Preferably, the striding connecting mechanism comprises:

[0024] a striding oil cylinder fixed to the direction adjusting platform;

[0025] a striding square box fixed to the output end of the striding oil cylinder;

[0026] a connecting square box fixed to the striding square box.

[0027] Preferably, a cavity is opened in the bottom of the direction adjusting platform, and the striding oil cylinder is fixed in the cavity.

[0028] The hydraulic support withdrawing device provided by the utility model has the advantages that compared with the prior art, the withdrawing device can realize the traction, direction adjusting and loading of the support to be withdrawn at one time, eliminates the defects of short direction adjusting distance and small rotating angle during the withdrawing of the support to be withdrawn, and realizes perfect combination with the support carrier or the scraper.

[0029] The shield support is used in cooperation to reduce the withdrawing empty roof area, solve the problem of the roof pressure in the triangular area, and ensure the safety of the working face. With the withdrawing device, the personnel configuration is optimized. At least 10 persons, including the winch driver, the hook worker, the hydraulic support worker, the single support worker and the like, are required in the original withdrawing process. Only one chain hanging worker and one equipment operator, two hydraulic support workers are required in the withdrawing device, and more than 6 workers are reduced. The hydraulic support is pulled out, adjusted in direction, rotated by 90° and straightened through three times of chain hanging during work, and is further pushed to the ground and then carried away by the support carrier. The application of the winch, the single support and the manual crane and the like is avoided, and the safety risk of the operating personnel is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a three-dimensional structure schematic view of the withdrawing device.

[0031] Figure 2 Positioning diagram for the device is set for the device of the utility model;

[0032] Figure 3 Explosive structure diagram for the device is set for the device of the utility model;

[0033] Figure 4 Structure diagram for the device is set for the device of the utility model;

[0034] Figure 5 Structure diagram for the device is set for the device of the utility model;

[0035] Figure 6 Structure diagram for the device is set for the device of the utility model;

[0036] Figure 7 Structure diagram for the device is set for the device of the utility model.

[0037] Explanation of reference numerals in the drawing

[0038] 1, push beam, 2, step connection mechanism, 21, connecting square box, 22, step square box, 23, step oil cylinder, 3, direction adjusting platform, 4, upper frame inclined platform, 5, pull frame mechanism, 51, pull frame oil cylinder one, 52, pull frame oil cylinder two, 53, first pull chain, 54, first guide sprocket, 55, sliding block, 56, slide, 57, pull frame body, 6, guide roller, 61, rotating sleeve, 62, link pin shaft, 63, fixed seat, 7, main platform, 8, lower frame inclined platform, 9, support to be withdrawn, 10, shield support, 101, shield support push oil cylinder, 11, connecting seat, 12, deviation adjusting oil cylinder, 13, right cantilever oil cylinder, 14, left cantilever oil cylinder, 15, second pull chain, 16, chain storage sprocket, 17, second guide sprocket. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. As long as the effects of the utility model can be achieved, various changes can be made to the implementation solutions.

[0040] By the personnel in the art, the parts in the case are connected in sequence, and the specific connection and operation sequence should be referred to the following working principle. The detailed connection means is the known technology in the art, and the following mainly introduces the working principle and process.

[0041] Reference Figures 1-7 A hydraulic support withdrawing device of the embodiment is described.

[0042] As Figure 2As shown, the device comprises a plurality of support frames 9 to be removed and a withdrawing device arranged along the arrangement direction of the support frames 9. In a preferred embodiment, the withdrawing device comprises a deflection platform 3 at the moving-in end and a main platform 7 at the moving-out end. Figure 2 As shown, the deflection platform 3 and the main platform 7 are assembled into one body and arranged along the arrangement direction of the support frames 9 to be removed, for transferring and guiding the support frames 9 to be removed on the old bank side.

[0043] As shown in Figure 1 , Figure 2 and Figure 3 , a plurality of guide rollers 6 are arranged on the deflection platform 3 in an arc shape along the direction from the moving-in end to the main platform 7. The deflection platform 3 and the main platform 7 are respectively provided with a first traction group and a second traction group. The support frames 9 to be removed are pulled onto the deflection platform 3 and the main platform 7 by the traction cooperation of the first traction group and the second traction group, and then guided and moved out.

[0044] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 6 , specifically, the first traction group of the embodiment comprises a pull frame mechanism 5, which comprises a pull frame oil cylinder and a first pull displacement chain 53. The pull frame oil cylinder drives the first pull displacement chain 53 to retract and displace, and pulls the support frames 9 to be removed onto the deflection platform 3 and preliminarily guides them to the moving-out end direction.

[0045] The pull frame mechanism 5 further comprises a pull frame frame body 57, and the pull frame oil cylinder is arranged on the pull frame frame body 57. The pull frame oil cylinder comprises a pull frame oil cylinder one 51 and a pull frame oil cylinder two 52, which are arranged side by side. One end of the first pull displacement chain 53 is fixed on the output end of the pull frame oil cylinder one 51, and the output end of the pull frame oil cylinder two 52 is provided with a first guide sprocket 54, and the first pull displacement chain 53 is lapped on the first guide sprocket 54.

[0046] A slide 56 is arranged on the pull frame frame body 57 along the advancing direction of the pull frame oil cylinder one 51 and the pull frame oil cylinder two 52. The output end of the pull frame oil cylinder two 52 is fixed with a sliding block 55, which is slidingly connected to the slide 56. The first guide sprocket 54 is rotatably connected to the sliding block 55.

[0047] The pull frame oil cylinder one 51 is in an extended state in the initial state, and in the working state, the pull frame oil cylinder one 51 retracts to pull the first pull displacement chain 53 to retract. After the pull frame oil cylinder one 51 retracts to the maximum stroke, the pull frame oil cylinder two 52 extends to work, pushing the sliding block 55 to drive the first guide sprocket 54 to move forward on the slide 56, further making the first pull displacement chain 53 pull the support frames 9 to be removed onto the deflection platform 3, and making the first pull displacement chain 53 deviate to the direction of the main platform 7, so that the side wall surface of the support frames 9 to be removed is fitted on the guide rollers 6.

[0048] Specifically, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 7 , the second traction group of the embodiment includes right cantilever oil cylinder 13 and left cantilever oil cylinder 14 and two second pull chains 15, the output end and the bottom end of the right cantilever oil cylinder 13 and the left cantilever oil cylinder 14 are respectively provided with a second guide sprocket 17 and a chain storage sprocket 16, one end of the two second pull chains 15 is wound and fixed on the chain storage sprocket 16, and the other end is a hooking end, which is lapped on the guide sprocket 17.

[0049] Wherein, when the hooking end of the second pull chain 15 on the right cantilever oil cylinder 13 hooks on the support to be withdrawn 9, the right cantilever oil cylinder 13 promotes the second step guiding of the support to be withdrawn 9 on the direction adjusting platform 3; when the hooking end of the pull chain 15 on the right cantilever oil cylinder 13 and the left cantilever oil cylinder 14 both hooks on the support to be withdrawn 9, the right cantilever oil cylinder 13 and the left cantilever oil cylinder 14 promote the support to be withdrawn 9 to be moved out from the moving-out end.

[0050] As shown in Figure 5 , the guide roller 6 includes a rotating sleeve 61, a link pin shaft 62 and a fixed seat 63. The fixed seat 63 is fixed on the direction adjusting platform 3; the link pin shaft 62 extends into and is fixed in the fixed seat 63 at one end, and extends out of the fixed seat 63 at the other end; the rotating sleeve 61 is rotationally connected on the link pin shaft 62. When the support to be withdrawn 9 is guided in the first step and the second step on the direction adjusting platform 3, it contacts on the rotating sleeve 61, and the rotating sleeve 61 assists the guiding of the support to be withdrawn 9 when the rotating sleeve 61 rotates due to the rotational connection on the link pin shaft 62.

[0051] As shown in Figure 1 , Figure 2 and Figure 3 , the side of the outer edge of the direction adjusting platform 3 close to the main platform 7 is provided with a deflection oil cylinder 12, and the fixed end of the deflection oil cylinder 12 is hinged on the direction adjusting platform 3. When the position of the direction adjusting platform 3 and the main platform 7 deviates during the transfer of the support to be withdrawn 9, the output end of the deflection oil cylinder 12 is fixed on a fixed object, and when the deflection oil cylinder 12 promotes the work, the whole withdrawal device is pushed away from the support to be withdrawn 9, so as to reset the withdrawal device.

[0052] As shown in Figure 1 , Figure 2 and Figure 3 , the moving-in end of the withdrawal device is provided with an upper rack inclined platform 4 fixed on the direction adjusting platform 3, and the upper rack inclined platform 4 is arranged to face the support to be withdrawn 9. The moving-out end of the withdrawal device is provided with a lower rack inclined platform 8 fixed on the main platform 7. As shown in Figure 1 and Figure 3 , the upper rack inclined platform 4 assists the support to be withdrawn 9 to enter the direction adjusting platform 3 along the direction adjusting platform 3, and the lower rack inclined platform 8 assists the support to be withdrawn 9 to move out on the main platform 7.

[0053] As Figure 1 , Figure 2 and Figure 3 shown, in another embodiment, the steering platform 3 is provided with a shield support 10 away from one side of the main platform 7, the front end of the shield support 10 is provided with a shield support push cylinder 101, the output end of the shield support push cylinder 101 is fixed on one end of the push beam 1, the other end of the push beam 1 is connected with the steering platform 3 through the step connection mechanism 2.

[0054] As Figure 5 shown, the step connection mechanism 2 includes a connection square box 21, a step square box 22 and a step cylinder 23. The connection square box 21 is fixed on the step square box 22; the step square box 22 is fixed on the output end of the step cylinder 23; the step cylinder 23 is fixed on the steering platform 3, further, the steering platform 3 is provided with a cavity at the bottom, and the step cylinder 23 is fixed in the cavity.

[0055] After the withdrawal device pulls and migrates away one support to be removed 9, the withdrawal device is driven to displace through the advancing work of the shield support push cylinder 101 and the advancing work of the step cylinder 23, so that the step distance is greater than the width distance of one support to be removed 9, and the withdrawal device performs the second pulling and migration.

[0056] Working mode:

[0057] Preparation, when starting to withdraw, the withdrawal device is arranged on the front side of the arrangement direction of the support to be removed 9, and enough safety distance is ensured between the withdrawal device and the support to be removed 9 and the coal wall side. The output end (piston rod) of the pull support cylinder one 51 of the pull support mechanism 5 is in the extended state, and the output end (piston rod) of the pull support cylinder two 52 is in the retracted state.

[0058] Pulling out work, the push cylinder of the support to be removed 9 itself is extended, the first pull and migration chain 53 is hooked on the push cylinder of the support to be removed 9, and the other end of the first pull and migration chain 53 is connected to the pull support cylinder one 51. The push cylinder of the support to be removed 9 itself is retracted, and the support to be removed 9 advances one step distance on the coal wall side, and then the pull support cylinder one 51 is retracted, so that the first pull and migration chain 53 pulls the support to be removed 9 to pull out the support to be removed 9 from the original position, and the moving process is moved into the steering platform 3 through the upper support inclined platform 4.

[0059] When the steering work is performed, the pull frame oil cylinder 1 51 is retracted to the limit, the pull frame oil cylinder 2 52 piston rod is extended, the slider 55 is moved forward along the slide 56, the first guide sprocket on the slider 55 is moved forward, and the first pull chain 53 pulls the support to be removed 9 to the steering platform 6. In this process, the first pull chain 53 and the support to be removed 9 form an angle, so that the connection end of the support to be removed 9 is inclined to the main platform 7, and in the process of moving forward, the support to be removed 9 is in contact with the guide roller 6 and rotates under the guidance of the guide roller 6, and the preliminary steering is completed. When the piston rod of the pull frame oil cylinder 2 52 is extended to the limit, the first pull chain 53 is removed, and the second pull chain 15 at the front end of the right cantilever oil cylinder 13 is connected with the support to be removed 9. The right cantilever oil cylinder 13 is extended, the support to be removed 9 is further moved forward and rotated to the main platform 7, and the final steering is completed after being pulled to the main platform 7.

[0060] The front pushing work is performed, the right cantilever oil cylinder 13 is retracted, the second pull chain 15 at the front end of the right cantilever oil cylinder 13 and the left cantilever oil cylinder 14 is hung on the left and right sides of the support to be removed 9, the oil cylinders of the left cantilever 73 and the right cantilever 72 are simultaneously extended, the support to be removed 9 is pushed forward on the main platform 7 and finally falls to the ground through the lower inclined platform 8.

[0061] The step work is performed: after the support to be removed 9 falls to the ground, the support to be removed 9 is transported away by the support carrier or the shovel plate vehicle, the shield support pushing oil cylinder 101 of the shield support 10 arranged at the rear of the withdrawing device is extended, the withdrawing device is pushed forward, the piston rod of the step oil cylinder 23 is extended to continue to push the withdrawing device, and through the cooperation of the shield support pushing oil cylinder 101 and the step oil cylinder 23, the withdrawing device is moved forward by the width of the support to be removed 9, so that the next support to be removed 9 to be pulled corresponds to the upper inclined platform 4. The working steps of the withdrawing work and the step work are repeated, and finally the pulling work of all the supports to be removed 9 is completed.

[0062] In the process of pulling the support to be removed 9, the position of the withdrawing device may be deviated, at this time, the output end of the deviation adjusting oil cylinder 12 is fixed on a fixed object, and when the deviation adjusting oil cylinder 12 is pushed, the withdrawing device is pushed away from the support to be removed 9, so that the withdrawing device is reset.

[0063] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A hydraulic support retraction device, characterised in that: The device comprises a plurality of to-be-withdrawn supports (9) and a withdrawing device arranged along the arrangement direction of the to-be-withdrawn supports (9), the withdrawing device comprises a deflection platform (3) at the moving-in end and a main platform (7) at the moving-out end; a plurality of guide rollers (6) are arranged on the deflection platform (3) in an arc line shape along the direction from the moving-in end to the main platform (7); The deflection platform (3) and the main platform (7) are respectively provided with a first traction group and a second traction group; The first traction group comprises a pull frame mechanism (5), the pull frame mechanism (5) comprises a pull frame oil cylinder and a first pull displacement chain (53), the pull frame oil cylinder drives the first pull displacement chain (53) to retract and displace, and drags the to-be-withdrawn support (9) to the deflection platform (3) along the entering end and performs preliminary guiding; The second traction group comprises a right cantilever oil cylinder (13), a left cantilever oil cylinder (14) and two second pull displacement chains (15), the output end and the bottom end of the right cantilever oil cylinder (13) and the left cantilever oil cylinder (14) are respectively provided with a second guide sprocket (17) and a chain storage sprocket (16), one end of the two second pull displacement chains (15) is fixed on the chain storage sprocket (16), and the other end is a hooking end and is lapped on the guide sprocket (17); When the hooking end of the second pull displacement chain (15) on the right cantilever oil cylinder (13) is hooked on the to-be-withdrawn support (9), the right cantilever oil cylinder (13) promotes the to-be-withdrawn support (9) to be guided on the deflection platform (3) for the second step; when the hooking ends of the pull displacement chains (15) on the right cantilever oil cylinder (13) and the left cantilever oil cylinder (14) are hooked on the to-be-withdrawn support (9), the right cantilever oil cylinder (13) and the left cantilever oil cylinder (14) promote the to-be-withdrawn support (9) to be moved out of the moving-out end.

2. The hydraulic support retracting device according to claim 1, characterized in that: The pull frame mechanism (5) further comprises a pull frame frame body (57), the pull frame oil cylinder is arranged on the pull frame frame body (57), the pull frame oil cylinder comprises a pull frame oil cylinder one (51) and a pull frame oil cylinder two (52), one end of the first pull displacement chain (53) is fixed on the output end of the pull frame oil cylinder one (51), the output end of the pull frame oil cylinder two (52) is provided with a first guide sprocket (54), and the first pull displacement chain (53) is lapped on the first guide sprocket (54).

3. The hydraulic support retraction device according to claim 2, characterized in that: A slide (56) is arranged on the pull frame frame body (57) along the advancing direction of the pull frame oil cylinder one (51) and the pull frame oil cylinder two (52), the output end of the pull frame oil cylinder two (52) is fixed with a sliding block (55), the sliding block (55) is slidingly connected on the slide (56), and the first guide sprocket (54) is rotationally connected on the sliding block (55).

4. The hydraulic support retracting device according to claim 1, characterized in that: The guide roller (6) comprises: A fixed seat (63) is fixed on the deflection platform (3); A link pin shaft (62) is inserted into and fixed in the fixed seat (63) at one end and extends out of the fixed seat (63) at the other end; A rotating sleeve (61) is rotationally connected on the link pin shaft (62).

5. The hydraulic support retracting device according to claim 1, characterized in that: A deflection oil cylinder (12) is arranged on the side of the outer edge of the deflection platform (3) close to the main platform (7), and the fixed end of the deflection oil cylinder (12) is hingedly connected on the deflection platform (3).

6. The hydraulic support retraction device according to claim 1, characterized in that: The moving-in end of the withdrawing device is provided with an upper rack inclined platform (4) fixed on the direction adjusting platform (3).

7. The hydraulic support retraction device according to claim 1, characterized in that: The moving-out end of the withdrawing device is provided with a lower rack inclined platform (8) fixed on the main platform (7).

8. The hydraulic support retraction device according to claim 1, characterized in that: The side of the direction adjusting platform (3) away from the main platform (7) is provided with a shelter support (10), the front end of the shelter support (10) is provided with a shelter support pushing oil cylinder (101), the output end of the shelter support pushing oil cylinder (101) is fixed on one end of a pushing cross beam (1), the other end of the pushing cross beam (1) is connected with the direction adjusting platform (3) through a step connection mechanism (2).

9. The hydraulic support retraction device according to claim 8, characterized in that: The step connection mechanism (2) comprises: a step oil cylinder (23) fixed on the direction adjusting platform (3); a step square box (22) fixed on the output end of the step oil cylinder (23); a connecting square box (21) fixed on the step square box (22).

10. The hydraulic support retraction device according to claim 9, characterized in that: The bottom of the direction adjusting platform (3) is provided with a cavity, and the step oil cylinder (23) is fixed in the cavity.

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