A hydraulic support device and gap adjustment method for a retractable boom of a heading machine

Abstract

The present application relates to the technical field of coal mine underground roadway tunneling, and particularly relates to a hydraulic support device and a gap adjustment method for a telescopic cantilever of a tunneling machine. The hydraulic support device comprises a plurality of groups of support assemblies arranged between a telescopic cylinder and a fixed cylinder, the support assemblies are arranged circumferentially along the surface of the fixed cylinder, and the support assembly comprises a cover plate, a movable oil cylinder, a piston, a sliding block and a limiting plate. The cover plate is fixedly arranged on the outer surface of the fixed cylinder, the movable oil cylinder is threadedly connected with the cover plate, an oil inlet is formed in the end of the movable oil cylinder close to the outer surface of the fixed cylinder, an oil cavity is formed in the movable oil cylinder and communicates with the oil inlet, the piston is slidably arranged in the oil cavity, the sliding block is arranged in contact with the end of the piston away from the movable oil cylinder, and the sliding block is slidably arranged between the limiting plates arranged at the two ends of the cover plate. The present application can be used for heavy-load cantilever-type tunneling equipment, the hydraulic support device effectively suppresses cantilever vibration and significantly enhances the stability of the tunneling equipment, and the guide gap can be adjusted in time according to the working conditions, thereby effectively prolonging the service life of the tunneling equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine underground roadway tunneling, and particularly relates to a hydraulic support device and a gap adjustment method for a telescopic cantilever of a tunneling machine. BACKGROUND

[0002] The cutting process of the cantilever type tunneling machine mainly includes two working modes of feed slotting and swing cutting. When the feed slotting is performed, the telescopic mechanism of the cantilever is controlled by the hydraulic cylinder to complete the telescopic movement of the cutting mechanism. The common telescopic mechanism mainly comprises a telescopic cylinder, a fixed cylinder and a hydraulic system, and a sliding block and a key are arranged between the telescopic cylinder and the fixed cylinder to complete the guiding and limiting of the telescopic movement.

[0003] In the roadway construction, the geological conditions are constantly changing, especially when hard rock is cut, the cutting mechanism of the tunneling machine will bear complex and variable loads and generate severe vibration. Due to the fact that the telescopic mechanism of the cantilever always bears a large cutting torque and vibration, the sliding block and the key are prone to wear, which shortens the service life of the telescopic mechanism and reduces the operation reliability of the tunneling machine. The guiding gap of the guiding sliding block of the telescopic mechanism is controlled by the initial machine tool processing size, and the guiding gap has an important influence on the working stability of the telescopic mechanism. SUMMARY

[0004] In order to solve the technical problems that the guiding gap of the telescopic mechanism cannot be dynamically adjusted during the cutting process of the tunneling machine, the guiding gap is too large, the cantilever of the tunneling machine vibrates severely, the reliability is low and the maintenance is difficult, the present application provides a hydraulic support device and a gap adjustment method for a telescopic cantilever of a tunneling machine.

[0005] The present application provides a hydraulic support device for a telescopic cantilever of a tunneling machine, comprising: a plurality of groups of support assemblies arranged between the telescopic cylinder and the fixed cylinder, the support assemblies being arranged circumferentially along the surface of the fixed cylinder, the support assemblies providing a force for extruding along the inner surface of the fixed cylinder to the outer surface of the telescopic cylinder to limit the relative movement between the telescopic cylinder and the fixed cylinder.

[0006] The support assembly comprises a cover plate, a movable oil cylinder, a piston, a sliding block and a limiting plate, the cover plate is fixedly arranged on the outer surface of the fixed cylinder, the movable oil cylinder is threadedly connected with the cover plate, the piston is slidably arranged in the oil cavity, the piston penetrates through the bottom of the oil cylinder, the end of the piston away from the movable oil cylinder is movably connected with the sliding block, the sliding block is pressurized by the oil in the oil cavity to reduce the guiding gap between the sliding block and the telescopic cylinder, the two ends of the cover plate are fixedly provided with the limiting plates, the sliding block is slidably arranged between the limiting plates at the two ends of the cover plate, and the limiting plates limit the two ends of the sliding block perpendicular to the movement direction.

[0007] Optionally, an oil inlet is formed at one end of the movable oil cylinder close to the outer surface of the fixed cylinder, an oil cavity is formed in the movable oil cylinder and communicates with the oil inlet, and the piston is tightly attached to the inner wall of the movable oil cylinder.

[0008] Optionally, the cover plate is provided with an oil injection nozzle near one side of the limiting plate, the oil injection nozzle is fixedly connected with a lubricating hose near one side of the sliding block, the sliding block is internally provided with a lubricating oil path, the lubricating hose is in communication with the lubricating oil path, the lubricating oil path is provided with an oil outlet at an end portion, and the surface of the oil path sliding block near one side of the telescopic cylinder is provided with a plurality of oil grooves in communication with the oil outlet.

[0009] Optionally, the fixed cylinder is a square cylinder, and each side wall of the fixed cylinder is provided with two groups of support assemblies, and each group of support assemblies is provided with three movable oil cylinders.

[0010] Optionally, the oil groove comprises a plurality of first oil grooves arranged along a first direction and a plurality of second oil grooves arranged along a second direction, and the first oil grooves and the second oil grooves are in communication and arranged vertically.

[0011] The lubricating oil path comprises a plurality of long lubricating oil paths and short lubricating oil paths arranged along a first direction.

[0012] Optionally, the movable oil cylinder comprises a cylinder body and a fixed portion at the top of the cylinder body, the outer surface of the cylinder body is provided with threads, the diameter of the fixed portion is greater than the diameter of the cylinder body, the fixed portion is bolted to the cover plate through a plurality of movable bolts arranged in an axial direction, and the movable bolts are provided with 10.

[0013] A gap adjustment method based on a hydraulic support device of a telescopic boom of a heading machine, comprising the following steps:

[0014] S1: during the assembly process of the heading machine boom, the installation of the telescopic cylinder and the fixed cylinder is completed, and the support assembly is installed on the fixed cylinder;

[0015] S2: a guide gap between the sliding block and the telescopic cylinder is preset, and a wrench is used to rotate and tighten the movable oil cylinder in a clockwise direction until there is no contact gap between the movable oil cylinder, the sliding block and the telescopic cylinder;

[0016] S3: a wrench is used to rotate and loosen the movable oil cylinder in a counterclockwise direction until the preset value of the guide gap between the sliding block and the telescopic cylinder is obtained;

[0017] S4: the movable bolts of the movable oil cylinder are all tightened using a wrench, and the self-locking of the guide gap is completed;

[0018] S5: after the heading machine works for a period of time, the telescopic cylinder of the heading machine is fully retracted into the fixed cylinder, the boom is lowered, the cutting head is placed on the ground of the roadway, and the motor is powered off and stopped;

[0019] S6: the installation bolts of the movable oil cylinder are loosened using a wrench, and then the movable oil cylinder is rotated and tightened in a clockwise direction, steps S3 and S4 are repeated until the required preset value of the guide gap is obtained;

[0020] S7: using wrench to tighten all the movable oil cylinder mounting bolts, completing the adjustment of the guide clearance and self-locking.

[0021] Optionally, the guide clearance between the slider and the telescopic cylinder is d1, the clearance between the movable oil cylinder and the slider is d2, the clearance between the oil cylinder and the cover plate is d3, and d1=d2=d3.

[0022] Optionally, the minimum angle of axial rotation of the movable oil cylinder is 36°, the axial movement distance of one rotation of the movable oil cylinder is one pitch, the minimum axial movement distance of the movable oil cylinder is one tenth of the pitch, and the minimum adjustment value of the clearance between the movable oil cylinder and the cover plate is one tenth of the pitch.

[0023] Compared with the prior art, the technical scheme provided by the embodiment of the present application has the following beneficial effects:

[0024] When the heading machine feeds the slotting operation, the telescopic cylinder of the cutting structure extends to the working position, the high-pressure hydraulic oil enters the movable oil cylinder through the hydraulic oil port, the pressure oil drives the piston to move downward, the pressure is loaded on the slider, the slider extrudes the telescopic cylinder, and the guide clearance is reduced, so that the clamping action of the hydraulic support device on the telescoping mechanism is realized. By applying the hydraulic support device and the gap adjustment method of the telescoping boom of the heading machine provided by the present application, the dynamic adjustment of the gap of the telescoping mechanism of the heavy-load telescoping heading machine can be completed, the telescoping boom vibration phenomenon during the operation of the heading machine is effectively inhibited, and the working reliability of the heading equipment is improved. The slider in the hydraulic support device can be quickly replaced without disassembling the telescoping mechanism, and the maintenance efficiency of the heading equipment is significantly improved. The reasonable lubrication structure design can reduce the friction and wear of the telescoping mechanism and improve the working efficiency of the heading equipment. The guide clearance is adjusted by rotating the movable oil cylinder, the working life of the heading equipment is effectively prolonged, the minimum axial movement distance of the movable oil cylinder is one tenth of the pitch, and the minimum adjustment value of the guide clearance is one tenth of the pitch. The telescoping mechanism can smoothly slide, so that the heading machine can work efficiently and stably. Moreover, the coarse thread of the movable oil cylinder is used for adjusting the guide clearance, the structure is simple, the operation is convenient, and the precision is high. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1This is a schematic diagram of the telescopic mechanism of the present invention;

[0028] Figure 2 This is a schematic diagram of the guide clearance of the telescopic mechanism of the present invention;

[0029] Figure 3 This is a schematic diagram of the hydraulic support device of the present invention;

[0030] Figure 4 This is a cross-sectional view of the hydraulic support device of the present invention;

[0031] Figure 5 This is a schematic diagram of the slider structure of the present invention.

[0032] The components include: 1. Telescopic cylinder; 2. Fixed cylinder; 3. Support assembly; 4. Cover plate; 5. Mounting bolt; 6. Movable cylinder; 7. Movable bolt; 8. Oil inlet; 9. Oil nozzle; 10. Limiting plate; 11. Piston; 12. Guide belt; 13. Seal; 14. Slider; 15. Lubricating hose; 16. Lubricating oil passage; 17. Oil outlet; 18. Oil reservoir; 181. First oil reservoir; 182. Second oil reservoir; 19. Cylinder body; 20. Fixing part. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0035] Reference Figures 1 to 5As shown, this embodiment provides a hydraulic support device for a tunneling machine telescopic boom, including several sets of support components 3 disposed between a telescopic cylinder 1 and a fixed cylinder 2. The support components 3 are arranged circumferentially along the surface of the fixed cylinder 2. The support components 3 provide a force that presses against the outer surface of the telescopic cylinder 1 along the inner surface of the fixed cylinder 2 to limit the relative movement between the telescopic cylinder 1 and the fixed cylinder 2. The support components 3 include a cover plate 4, a movable cylinder 6, a piston 11, a slider 14, and a limiting plate 10. The cover plate 4 is fixedly disposed on the outer surface of the fixed cylinder 2. The movable cylinder 6 is threadedly connected to the cover plate 4. The piston 11 is slidably disposed in the oil chamber. The piston 11 passes through the bottom of the cylinder. The end of the piston 11 away from the movable cylinder 6 is in contact with the slider 14. The slider 14 pressurizes the piston 11 through the oil in the oil chamber, thereby reducing the guide gap between the slider 14 and the telescopic cylinder 1. Limiting plates 10 are fixedly disposed at both ends of the cover plate 4. The slider 14 is slidably disposed between the limiting plates 10 at both ends of the cover plate 4. The limiting plates 10 limit the slider 14 at both ends perpendicular to the direction of movement.

[0036] Based on the above embodiments, in a preferred embodiment, the movable cylinder 6 has an oil inlet 8 at one end near the outer surface of the fixed cylinder 2, and an oil cavity communicating with the oil inlet 8 is provided inside the movable cylinder 6, and the piston 11 is tightly fitted with the inner wall of the movable cylinder 6.

[0037] Among them, the fixed cylinder 2 is a square cylinder, and two sets of support components 3 are provided on the outer surface of each side wall of the fixed cylinder 2. Each set of support components 3 is provided with three movable oil cylinders 6.

[0038] When the tunneling machine is feeding and cutting, the telescopic cylinder 1 of the cutting structure extends to the working position. High-pressure hydraulic oil enters the movable cylinder 6 through the hydraulic port 8. The pressure oil pushes the piston 11 downward, which in turn causes the slider 14 to squeeze the telescopic cylinder 1, reducing the guide clearance. This continues until the hydraulic system pressure reaches a certain value P1 (adjusted according to the on-site effect), thus achieving the clamping effect of the hydraulic support device 3 on the telescopic cylinder 1. After the cutting operation ends, the hydraulic system is depressurized to a certain value P2 (adjusted according to the on-site effect). The pressure on the piston 11 decreases, the guide clearance between the slider 14 and the telescopic cylinder 1 increases, and the telescopic cylinder 1 retracts into the fixed cylinder 2.

[0039] Based on the above embodiments, in a preferred embodiment, an oil injection nozzle 9 is provided on the side of the cover plate 4 near the limiting plate 10. A lubrication hose 15 is fixedly connected to the side of the oil injection nozzle 9 near the slider 14. The lubrication hose 15 has a certain degree of elasticity. A lubrication oil passage 16 is opened inside the slider 14. The lubrication hose 15 is connected to the lubrication oil passage 16. An oil outlet 17 is provided at the end of the lubrication oil passage 16. Several oil storage grooves 18 are opened on the surface of the slider 14 near the telescopic cylinder 1. The oil outlet 17 is connected to the oil storage grooves 18. The lubricating grease enters the oil storage grooves 18 through the oil injection nozzle 9, the lubrication hose 15, the lubrication oil passage 16, and the oil outlet 17, thereby achieving efficient lubrication of the contact surface between the slider 14 and the telescopic cylinder 1.

[0040] Furthermore, the oil storage tank 18 includes a plurality of first oil tanks 181 arranged along a first direction and a plurality of second oil tanks 182 arranged along a second direction. The first oil tanks 181 and the second oil tanks 182 are interconnected and arranged perpendicularly. The lubrication oil passage 16 includes a plurality of two long lubrication oil passages and two short lubrication oil passages arranged along the first direction. The oil outlets of the two long lubrication oil passages and the two short lubrication oil passages are all located at one end of the oil passage near the center of the slider 14. Using a grease gun, lubricating grease is added to the lubrication oil passage 16 in the slider 14 through the grease nozzle 9. The grease will enter the friction contact interface through the four oil outlets 17 on the surface of the slider 14, effectively reducing the friction between the slider 14 and the telescopic cylinder 1. At the same time, the contact surface of the slider 14 is distributed with longitudinally and transversely connected oil storage tanks 18 for storing lubricating grease and wear debris, further reducing the wear of the contact surface.

[0041] Based on the above embodiments, in a preferred embodiment, the movable cylinder 6 includes a cylinder body 19 and a fixing part 20 on the top of the cylinder body 19. The cylinder body 19 is provided with threads on the outside. The diameter of the fixing part 20 is larger than the diameter of the cylinder body 19. The fixing part 20 is bolted to the cover plate 4 by movable bolts 7. Ten movable bolts 7 are provided.

[0042] The present invention also provides a gap adjustment method based on the hydraulic support device of the telescopic boom of a tunneling machine, comprising the following steps:

[0043] S1: During the assembly of the tunneling machine cantilever, the telescopic cylinder 1 and the fixed cylinder 2 are installed, and the support assembly 3 is installed on the fixed cylinder 2.

[0044] S2: Preset a guide gap between slider 14 and telescopic cylinder 1. Use a wrench to rotate the movable cylinder 6 clockwise and tighten it until there is no contact gap between the movable cylinder 6, slider 14 and telescopic cylinder 1.

[0045] S3: Use a wrench to rotate the movable cylinder 6 counterclockwise until the preset guide clearance value between the slider 14 and the telescopic cylinder 1 is obtained;

[0046] S4: Use a wrench to tighten all the movable bolts 7 of the movable cylinder 6 to complete the self-locking of the guide clearance;

[0047] S5: After the tunneling machine has been working for a period of time, the tunneling machine telescopic cylinder 1 is fully retracted into the fixed cylinder 2, the boom is lowered, the cutting head is placed on the roadway ground, and the motor is powered off and the machine is stopped.

[0048] S6: Use a wrench to loosen the mounting bolts of the movable cylinder 6, then rotate the movable cylinder 6 clockwise to tighten it. Repeat steps S3 and S4 until the desired guide clearance preset value is obtained.

[0049] S7: Use a wrench to tighten all the movable bolts 7 installed on the movable cylinder 6 to complete the adjustment of the guide clearance and self-locking.

[0050] Specifically, when the movable cylinder 6 is not activated for oil injection, the guide gap between the slider 14 and the telescopic cylinder 1 is d1, meaning the range of motion of the slider 14 is d1. The gap between the movable cylinder 6 and the slider 14 is d2, and the gap between the movable cylinder 6 and the cover plate 4 is d3, where d1 = d2 = d3. The angle between two adjacent movable bolts 7 is 36°, meaning the minimum rotation angle of the fixed connection after the movable cylinder 6 rotates is 36°.

[0051] Specifically, the adjustment distances are as follows: the axial movement distance of one revolution of the movable cylinder 6 is one pitch; the minimum axial movement distance of the movable cylinder 6 is one-tenth of a pitch; and the minimum adjustment value of the clearance d3 is one-tenth of a pitch.

[0052] After prolonged operation and frequent operation of the telescopic mechanism, the guide clearance has been adjusted multiple times, resulting in severe wear of slider 14, necessitating replacement. The telescopic cylinder 1 of the tunneling machine is fully retracted into the fixed cylinder 2. The boom is lowered, and the cutting head is placed on the roadway floor. The motor is then powered off and the machine is stopped. Using a wrench, the cover plate mounting bolts 5 are removed, and the hydraulic support device 3 is completely removed. Then, the baffle 10 and lubrication hose 15 are removed, and slider 14 is taken out from the end of the hydraulic support device 3. A new slider is reinstalled into the hydraulic support device 3, and then the hydraulic support device 3 is reinstalled onto the fixed cylinder 2 of the telescopic mechanism. Finally, the guide clearance is adjusted and self-locking is performed, and lubricating grease is added.

[0053] This invention can be used in heavy-duty cantilever tunneling equipment. The hydraulic support device effectively suppresses cantilever vibration and significantly enhances the stability of the tunneling equipment. The guide clearance can be adjusted in a timely manner according to the working conditions, effectively extending the working life of the tunneling equipment. The slider is easy to replace and maintain, effectively improving work efficiency.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0055] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A hydraulic support device for a tunneling machine telescopic boom, characterized in that, include: Several sets of support components (3) are provided between the telescopic cylinder (1) and the fixed cylinder (2). The support components (3) are arranged circumferentially along the surface of the fixed cylinder (2). The support components (3) provide a force that presses against the outer surface of the telescopic cylinder (1) along the inner surface of the fixed cylinder (2) to limit the relative movement between the telescopic cylinder (1) and the fixed cylinder (2). The support assembly (3) includes a cover plate (4), a movable cylinder (6), a piston (11), a slider (14), and a limiting plate (10). The cover plate (4) is fixedly mounted on the outer surface of the fixed cylinder (2). The movable cylinder (6) is threadedly connected to the cover plate (4). The piston (11) is slidably mounted in the oil chamber. The end of the piston (11) away from the movable cylinder (6) is in contact with the slider (14). The oil in the oil chamber pressurizes the piston (11) to reduce the guide gap between the slider (14) and the telescopic cylinder (1). Limiting plates (10) are fixedly mounted at both ends of the cover plate (4). The slider (14) is slidably mounted between the limiting plates (10) at both ends of the cover plate (4). The limiting plates (10) limit the slider (14) at both ends perpendicular to the direction of movement. Position; an oil inlet (8) is provided at one end of the movable cylinder (6) near the outer surface of the fixed cylinder (2), and an oil chamber connected to the oil inlet (8) is provided inside the movable cylinder (6), and the piston (11) is tightly fitted to the inner wall of the movable cylinder (6); an oil inlet (9) is provided on the side of the cover plate (4) near the limit plate (10), and a lubricating hose (15) is connected to the side of the oil inlet (9) near the slider (14), and a lubricating oil passage (16) is provided inside the slider (14), and the lubricating hose (15) is connected to the lubricating oil passage (16), and an oil outlet (17) is provided at the end of the lubricating oil passage (16). Several oil storage grooves (18) are provided on the surface of the oil passage slider (14) near the telescopic cylinder (1), and the oil outlet (17) is connected to the oil storage grooves (18).

2. The hydraulic support device for the telescopic boom of a tunneling machine according to claim 1, characterized in that, The fixed cylinder (2) is a square cylinder. Two sets of support components (3) are provided on the outer surface of each side wall of the fixed cylinder (2). Each set of support components (3) is provided with three movable oil cylinders (6).

3. The hydraulic support device for the telescopic boom of a tunneling machine according to claim 1, characterized in that, The oil storage tank (18) includes a plurality of first oil tanks (181) arranged along a first direction and a plurality of second oil tanks (182) arranged along a second direction. The first oil tanks (181) and the second oil tanks (182) are interconnected and arranged perpendicularly. The lubrication path (16) includes several long lubrication paths and short lubrication paths arranged along the first direction.

4. The hydraulic support device for the telescopic boom of a tunneling machine according to claim 1, characterized in that, The movable cylinder (6) includes a cylinder body (19) and a fixed part (20) on the top of the cylinder body (19). The outer surface of the cylinder body (19) is provided with threads. The diameter of the fixed part (20) is larger than the diameter of the cylinder body (19). The fixed part (20) is bolted to the cover plate (4) by a number of movable bolts (7) arranged axially. There are 10 movable bolts (7).

5. A gap adjustment method, based on the hydraulic support device of the tunneling machine telescopic cantilever as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: During the assembly of the tunneling machine cantilever, the telescopic cylinder (1) and the fixed cylinder (2) are installed, and the support assembly (3) is installed on the fixed cylinder (2); S2: Preset a guide gap between the slider (14) and the telescopic cylinder (1), and use a wrench to rotate the movable cylinder (6) clockwise until there is no contact gap between the movable cylinder (6), the slider (14) and the telescopic cylinder (1); S3: Use a wrench to rotate the movable cylinder (6) counterclockwise to loosen it until the preset guide gap between the slider (14) and the telescopic cylinder (1) is obtained; S4: Use a wrench to tighten all the movable bolts (7) of the movable cylinder (6) to complete the self-locking of the guide clearance; S5: After the tunneling machine has been working for a period of time, the tunneling machine telescopic cylinder (1) is completely retracted into the fixed cylinder (2), the boom is lowered, the cutting head is placed on the roadway ground, and the motor is powered off and the machine is stopped. S6: Use a wrench to loosen the mounting bolts of the movable cylinder (6), then rotate the movable cylinder (6) clockwise to tighten it. Repeat steps S3 and S4 until the desired guide clearance preset value is obtained. S7: Use a wrench to tighten all the movable bolts (7) installed on the movable cylinder (6) to complete the adjustment of the guide clearance and self-locking.

6. The gap adjustment method according to claim 5, characterized in that, The guide gap between the slider (14) and the telescopic cylinder (1) is d1, the gap between the movable cylinder (6) and the slider (14) is d2, and the gap between the movable cylinder (6) and the cover plate (4) is d3, and d1=d2=d3.

7. The gap adjustment method according to claim 5, characterized in that, The minimum axial rotation angle of the movable cylinder (6) is 36°, and the axial movement distance of one rotation of the movable cylinder (6) is 1 pitch; the minimum axial movement distance of the movable cylinder (6) is one-tenth of the pitch, and the minimum adjustment value of the gap between the movable cylinder (6) and the cover plate (4) is one-tenth of the pitch.

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