Hydraulic supporting device for telescopic cantilever of heading machine and gap adjusting method

Abstract

The invention relates to the technical field of coal mine underground roadway tunneling, in particular to a hydraulic supporting device for a telescopic cantilever of a tunneling machine and a gap adjusting method. Comprising a plurality of supporting assemblies arranged between a telescopic cylinder and a fixed cylinder, the supporting assemblies are arranged in the circumferential direction of the surface of the fixed cylinder, each supporting assembly comprises a cover plate, a movable oil cylinder, a piston, a sliding block and a limiting plate, the cover plates are fixedly arranged on the outer surface of the fixed cylinder, and the movable oil cylinders are in threaded connection with the cover plates; an oil cavity communicated with the oil injection port is formed in the movable oil cylinder, a piston is slidably arranged in the oil cavity, a sliding block is arranged at the end, away from the movable oil cylinder, of the piston in a contact mode, and the sliding block is slidably arranged between the limiting plates at the two ends of the cover plate. The hydraulic supporting device can be used for heavy-load cantilever type tunneling equipment, cantilever vibration is effectively restrained through the hydraulic supporting device, and the stability of the tunneling equipment is remarkably enhanced; the guide gap can be timely adjusted according to working conditions, and the service life of tunneling equipment is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of underground tunnel excavation in coal mines, and in particular to a hydraulic support device for a telescopic cantilever of a tunneling machine and a gap adjustment method. Background Art

[0002] The cutting process of the boom roadheader mainly includes two working modes: feeding and cutting and swing cutting. When feeding and cutting, the boom telescopic mechanism is controlled by a hydraulic cylinder to complete the telescopic movement of the cutting mechanism. The common telescopic mechanism is mainly composed of a telescopic cylinder, a fixed cylinder and a hydraulic system. A slider and a flat key are installed between the telescopic cylinder and the fixed cylinder to complete the guidance and limit of the telescopic movement.

[0003] The geological conditions in tunnel construction are constantly changing, especially when cutting hard rocks, the cutting mechanism of the boring machine will withstand complex and variable loads and produce violent vibrations. Since the cantilever telescopic mechanism has always withstands large cutting torque and vibration, the slider and flat keys are prone to wear, shortening the working life of the telescopic mechanism, thereby reducing the operating reliability of the boring machine. The guide gap of the guide slider of the telescopic mechanism of the tunneling machine is controlled by the initial machine tool processing size, and the guide gap has an important influence on the working stability of the telescopic mechanism. Summary of the invention

[0004] In order to solve the technical problems that the guide gap of the telescopic mechanism of the tunnel boring machine cannot be dynamically adjusted during the cutting process, resulting in excessive guide gap, severe vibration of the tunnel boring machine cantilever, low reliability, and great maintenance difficulty, the present invention provides a hydraulic support device and a gap adjustment method for the telescopic cantilever of the tunnel boring machine.

[0005] The present invention provides a hydraulic support device for a telescopic boom of a tunnel boring machine, comprising: a plurality of support components arranged between a telescopic cylinder and a fixed cylinder, the support components being arranged along the circumference of the surface of the fixed cylinder, the support components providing a force for pressing along the inner surface of the fixed cylinder toward the outer surface of the telescopic cylinder to limit the relative movement between the telescopic cylinder and the fixed cylinder;

[0006] The support assembly includes a cover plate, a movable oil cylinder, a piston, a slider and a limiting plate. The cover plate is fixedly arranged on the outer surface of the fixed cylinder. The movable oil cylinder is threaded to the cover plate. A piston is slided in the oil cavity. The piston penetrates the bottom of the oil cylinder. The piston moves away from the movable oil cylinder and contacts a slider. The slider presses the piston through the oil in the oil cavity to reduce the guiding gap between the slider and the telescopic cylinder. Both ends of the cover plate are fixedly arranged between the limiting plates at both ends of the cover plate. The limiting plate limits the slider perpendicular to the two ends of the movement direction.

[0007] Optionally, an oil filling port is provided at one end of the movable oil cylinder close to the outer surface of the fixed cylinder, an oil chamber connected to the oil filling port is provided in the movable oil cylinder, and the piston is tightly fitted to the inner wall of the movable oil cylinder.

[0008] Optionally, an oiling nozzle is provided on the side of the cover plate close to the limit plate, a lubrication hose is fixedly connected to the oiling nozzle close to the slider, a lubrication oil circuit is provided inside the slider, the lubrication hose is connected to the lubrication oil circuit, an oil outlet is provided at the end of the lubrication oil circuit, a plurality of oil grooves are provided on the surface of the oil circuit slider close to the telescopic cylinder, and the oil outlet is connected to the oil grooves.

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

[0010] Optionally, the oil groove includes a plurality of first oil grooves arranged along the first direction and a plurality of second oil grooves arranged along the second direction, and the first oil grooves and the second oil grooves are interconnected and arranged vertically;

[0011] The lubricating oil circuit includes a plurality of long lubricating oil circuits and short lubricating oil circuits arranged along a first direction.

[0012] Optionally, the movable oil cylinder includes a cylinder body and a fixed part on the top of the cylinder body, a thread is provided on the outer surface of the cylinder body, the diameter of the fixed part is larger than the diameter of the cylinder body, the diameter of the fixed part is larger than the diameter of the cylinder body, the fixed part is connected to the cover plate bolts through a number of axially arranged movable bolts, and 10 movable bolts are provided.

[0013] A gap adjustment method, based on a hydraulic support device of a telescopic cantilever of a tunnel boring machine, comprises the following steps:

[0014] S1: During the assembly of the boom of the roadheader, the telescopic cylinder and the fixed cylinder are installed, and the support assembly is installed on the fixed cylinder;

[0015] S2: Preset a guide gap between the slider and the telescopic cylinder, and use a wrench to tighten the movable cylinder clockwise until there is no contact gap between the movable cylinder, the slider and the telescopic cylinder;

[0016] S3: Use a wrench to loosen the movable cylinder counterclockwise until the preset guide clearance between the slider and the telescopic cylinder is obtained;

[0017] S4: Use a wrench to tighten all the movable bolts of the movable cylinder to complete the self-locking of the guide gap;

[0018] S5: After the tunnel boring machine has been working for a period of time, the telescopic cylinder of the tunnel boring machine is completely retracted into the fixed cylinder, the boom is operated to descend, the cutting head falls on the ground of the tunnel, and the motor is powered off and stopped;

[0019] S6: Use a wrench to loosen the mounting bolts of the movable oil cylinder, and then rotate the movable oil cylinder clockwise to tighten it, and repeat steps S3 and S4 until the required guide clearance preset value is obtained;

[0020] S7: Use a wrench to tighten all the mounting bolts of the movable cylinder to complete the adjustment of the guide clearance and self-locking.

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

[0022] Optionally, the minimum axial rotation angle of the movable cylinder is 36°, and the axial movement distance of the movable cylinder for one axial rotation is 1 pitch; the minimum axial movement distance of the movable cylinder is one-tenth of the pitch, and the minimum adjustment value of the gap between the movable cylinder and the cover plate is one-tenth of the pitch.

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

[0024] When the tunneling machine feeds the groove operation, the telescopic cylinder of the cutting structure extends to the working position, and the high-pressure hydraulic oil enters the movable oil cylinder through the hydraulic oil port. The pressure oil pushes the piston downward, and the pressure is loaded on the slider. The slider squeezes the telescopic cylinder, and the guide gap is reduced, thereby realizing the clamping effect of the hydraulic support device on the telescopic mechanism. By applying a hydraulic support device and a clearance adjustment method for telescopic cantilevers of the boring machine provided by the present invention, dynamic adjustment of the gap of the telescopic mechanism of the heavy-duty cantilever-type boring machine can be completed, effectively suppressing the cantilever vibration phenomenon during operation of the boring machine, and improving the working reliability of the boring equipment. The slider in the hydraulic support device can be quickly replaced without decomposing the telescopic mechanism, which significantly improves the maintenance efficiency of the excavation equipment. A reasonable lubricating structure design can reduce friction and wear of the telescopic mechanism and improve the working efficiency of the tunneling equipment. By rotating the movable oil cylinder, the guide clearance is adjusted to effectively extend the working life of the excavation equipment. The minimum distance of the axial movement of the movable oil cylinder is one tenth of the pitch, that is, the minimum adjustment value of the guide clearance is one tenth of the pitch. Ensure that the telescopic mechanism can slide smoothly, so that the tunneling machine can work efficiently and stably. Moreover, the coarse thread of the movable oil cylinder is used to adjust the guide clearance, which has the advantages of simple structure, convenient operation and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

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

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

[0030] Figure 4 It is a structural cross-sectional view of the hydraulic support device of the present invention; Figure 5 It is a schematic diagram of the slider structure of the present invention.

[0031] Among them, 1. telescopic cylinder; 2. fixing cylinder; 3. support assembly; 4. cover plate; 5. installation bolts; 6. movable oil cylinder; 7. movable bolts; 8. oil injection port; 9. oil injection nozzle; 10. limit plate; 11. piston; 12. guide belt; 13. seal; 14. slider; 15. lubricating hose; 16. lubricating oil passage; 17. oil outlet; 18. oil storage tank; 181. first oil groove; 182. second oil groove; 19. cylinder block; 20. fixing part. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] Reference Figures 1 to 5As shown in this embodiment, the hydraulic support device for a telescopic cantilever of a boring machine, including several groups of support components 3 arranged between the telescopic cylinder 1 and the fixing cylinder 2. The support component 3 is arranged along the surface of the fixing cylinder 2 circumferentially. The support component 3 provides a force to squeeze along the inner surface of the fixing cylinder 2 to the outer surface of the telescopic cylinder 1 to limit the relative movement between the telescopic cylinder 1 and the fixing cylinder 2. The support component 3 includes a cover plate 4, a movable oil cylinder 6, a piston 11, a slider 14 and a limiting plate 10, and the cover plate 4 is fixedly arranged on the fixing cylinder 2. On the outer surface, the movable oil cylinder 6 is threadedly connected to the cover plate 4. A piston 11 is slided in the oil cavity, and the piston 11 penetrates the bottom of the oil cylinder. The piston 11 moves to contact a slider 14 at one end away from the movable oil cylinder 6. The slider 14 presses the piston 11 through the oil in the oil cavity to reduce the guiding gap between the slider 14 and the telescopic cylinder 1. The two ends of the cover plate 4 are fixedly arranged between the slider 10. The slider 14 is slidally arranged between the limit plate 10 at both ends of the cover plate 4. The limit plate 10 limits the slider 14 perpendicular to the two ends of the movement direction.

[0035] On the basis of the above embodiment, in a preferred embodiment, an oil filling port 8 is opened at one end of the movable oil cylinder 6 close to the outer surface of the fixed cylinder 2, an oil chamber connected to the oil filling port 8 is opened in the movable oil cylinder 6, and the piston 11 is tightly fitted to the inner wall of the movable oil cylinder 6.

[0036] The fixed cylinder 2 is a square cylinder, and two groups of support components 3 are provided on the outer surface of each side wall of the fixed cylinder 2 , and each group of support components 3 is provided with three movable cylinders 6 .

[0037] When the tunneling machine feeds the groove operation, the telescopic cylinder 1 of the cutting structure extends to the working position, and the high-pressure hydraulic oil enters the movable oil cylinder 6 through the hydraulic oil port 8. The pressure oil pushes the piston 11 downward movement, and the slider 14 squeezes the telescopic cylinder 1, reducing the guide gap until the hydraulic system pressure reaches a certain value P1P1 is debugged according to the on-site effect, thereby realizing the clamping effect of the hydraulic support device 3 on the telescopic cylinder 1. After the cutting operation is completed, the hydraulic system pressure relief reaches a certain value P2 according to the on-site effect, the pressure of the piston 11 decreases, the guide gap between the slider 14 and the telescopic cylinder 1 increases, and the telescopic cylinder 1 retreats to the inside of the fixed cylinder 2.

[0038] Based on the above-mentioned embodiment, in a preferred embodiment, an oil injection nozzle 9 is provided on one side of the cover plate 4 near the limit plate 10 , and a lubricating hose 15 is fixedly connected to the side of the oil injection nozzle 9 near the slider 14 . The lubricating hose 15 has a certain degree of telescopicity , a lubricating oil passage 16 is opened inside the slider 14 , a lubricating hose 15 is in communication with the lubricating oil passage 16 , an oil outlet 17 is provided at the end of the lubricating oil passage 16 , and a number of oil storage grooves 18 are opened on the surface of the oil passage slider 14 near the telescopic cylinder 1 , and the oil outlet 17 is in communication with the oil storage groove 18 . The lubricating grease passes through the oil injection nozzle 9, passes through the lubricating hose 15, the lubricating oil passage 16 and the oil outlet 17, and enters the oil storage tank 18, thereby achieving efficient lubrication of the contact surface of the slider 14 and the telescopic cylinder 1.

[0039] Further, the oil storage tank 18 includes several first oil grooves 181 arranged in the first direction and several second oil grooves 182 arranged in the second direction. The first oil groove 181 and the second oil groove 182 are interconnected and arranged vertically. The lubricating oil passage 16 includes two long lubricating oil passages and two short lubricating oil passages arranged in the first direction. The oil outlets of the two long lubricating oil passages and two short lubricating oil passages are both located at the end of the oil passage near the center of the slider 14 . Use a butter gun to fill the lubricating oil passage 16 of the slider 14 through the oil injection 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 oil storage tank 18 connected vertically and horizontally, for storing lubricating grease and wear chips, further reducing wear on the contact surface.

[0040] On the basis of the above embodiment, in a preferred embodiment, the movable oil cylinder 6 includes a cylinder body 19 and a fixing part 20 at the top of the cylinder body 19, a thread is provided on the outside of the cylinder body 19, the diameter of the fixing part 20 is larger than the diameter of the cylinder body 19, and the fixing part 20 is bolted to the cover plate 4 through movable bolts 7, and 10 movable bolts 7 are provided.

[0041] The present invention also provides a gap adjustment method, based on a hydraulic support device of a telescopic cantilever of a tunnel boring machine, comprising the following steps:

[0042] S1: During the assembly of the boom of the roadheader, the telescopic cylinder 1 and the fixed cylinder 2 are installed, and the support assembly 3 is installed on the fixed cylinder 2;

[0043] S2: Preset a guide gap between the slider 14 and the telescopic cylinder 1, and use a wrench to tighten the movable cylinder 6 clockwise until there is no contact gap between the movable cylinder 6, the slider 14 and the telescopic cylinder 1;

[0044] S3: Use a wrench to loosen the movable oil cylinder 6 in a counterclockwise direction until the preset guide clearance between the slider 14 and the telescopic cylinder 1 is obtained;

[0045] S4: Use a wrench to tighten all the movable bolts 7 of the movable oil cylinder 6 to complete the self-locking of the guide gap;

[0046] S5: After the tunnel boring machine has worked for a period of time, the telescopic cylinder 1 of the tunnel boring machine is completely retracted into the fixed cylinder 2, the boom is operated to descend, the cutting head falls on the ground of the tunnel, and the motor is powered off and stopped;

[0047] S6: Use a wrench to loosen the mounting bolts of the movable oil cylinder 6, and then rotate the movable oil cylinder 6 clockwise to tighten it, and repeat steps S3 and S4 until the required preset guide clearance value is obtained;

[0048] S7: Use a wrench to tighten all the movable bolts 7 installed on the movable oil cylinder 6 to complete the adjustment of the guide clearance and self-locking.

[0049] Specifically, when the movable oil cylinder 6 is not started to inject oil, the guide gap between the slider 14 and the telescopic cylinder 1 is d1, that is, the movable range of the slider 14 is d1, the gap between the movable oil cylinder 6 and the slider 14 is d2, and the gap between the movable oil cylinder 6 and the cover plate 4 is d3, and d1 = d2 = d3. The angle between two adjacent movable bolts 7 is 36°, that is, the minimum rotation angle of the movable oil cylinder 6 after rotation is 36°.

[0050] Specifically, the adjustment distance is: the axial movement distance of the movable oil cylinder 6 for one axial rotation is 1 pitch; the minimum axial movement distance of the movable oil cylinder 6 is one tenth of the pitch, and the minimum adjustment value of the gap d3 is one tenth of the pitch.

[0051] When the boring machine works for a long time, the telescopic mechanism is frequently operated, and the guide clearance has been adjusted many times, and the slider 14 is seriously worn, so the slider 14 needs to be replaced. The telescopic cylinders 1 of the tunneling machine are all returned to the fixed cylinder 2, the cantilever is lowered, the cutting head is placed on the ground of the tunnel, and the motor is powered off and the machine is shut down. Use a wrench to remove the cover mounting bolt 5 and remove the hydraulic support device 3 as a whole. Then, the baffle plate 10 and the lubrication hose 15 are removed, the slider 14 is taken out from the end of the hydraulic support device 3 , the new slider is returned to the hydraulic support device 3 , and the hydraulic support device 3 is returned to the fixed cylinder 2 of the telescopic mechanism. Finally, adjust the guide gap and lock it, and complete the lubricating grease filling.

[0052] The present invention can be used for heavy-load cantilever tunneling equipment. The hydraulic support device effectively suppresses the vibration of the cantilever and significantly enhances the stability of the tunneling equipment. The guide gap can be adjusted in time according to the working conditions, effectively extending the working life of the tunneling equipment. The slider can be easily replaced and repaired, effectively improving work efficiency.

[0053] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] The above are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to these embodiments herein, but will be in accordance with the widest range consistent with the principles and novel features of the invention herein.

Claims

1. A hydraulic support device for a telescopic boom of a tunnel boring machine, characterized in that: include: A plurality of groups of support assemblies (3) are arranged between the telescopic cylinder (1) and the fixed cylinder (2), the support assemblies (3) are arranged along the circumference of the surface of the fixed cylinder (2), and the support assemblies (3) provide a force for pressing 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) comprises a cover plate (4), a movable oil cylinder (6), a piston (11), a slider (14) and a limit plate (10); the cover plate (4) is fixedly arranged on the outer surface of the fixed cylinder (2); the movable oil cylinder (6) is threadedly connected to the cover plate (4); a piston (11) is slidably arranged in an oil chamber; one end of the piston (11) away from the movable oil cylinder (6) is movably contacted with the slider (14); the piston (11) is pressurized by the oil in the oil chamber to reduce the guide gap between the slider (14) and the telescopic cylinder (1); the limit plates (10) are fixedly arranged at both ends of the cover plate (4); the slider (14) is slidably arranged between the limit plates (10) at both ends of the cover plate (4); and the limit plates (10) limit the two ends of the slider (14) perpendicular to the movement direction.

2. The hydraulic support device for the telescopic boom of a tunnel boring machine according to claim 1, characterized in that: An oil filling port (8) is provided at one end of the movable oil cylinder (6) close to the outer surface of the fixed cylinder (2), an oil chamber connected to the oil filling port (8) is provided in the movable oil cylinder (6), and the piston (11) is tightly fitted to the inner wall of the movable oil cylinder (6).

3. The hydraulic support device for the telescopic boom of a tunnel boring machine according to claim 1, characterized in that: A lubrication nozzle (9) is provided on one side of the cover plate (4) close to the limit plate (10); a lubrication hose (15) is connected to the lubrication nozzle (9) on one side close to the slider (14); a lubrication oil path (16) is provided inside the slider (14); the lubrication hose (15) is connected to the lubrication oil path (16); an oil outlet (17) is provided at the end of the lubrication oil path (16); a plurality of oil storage grooves (18) are provided on the surface of the oil path slider (14) on one side close to the telescopic cylinder (1); and the oil outlet (17) is connected to the oil storage grooves (18).

4. The hydraulic support device for the telescopic boom of a tunnel boring machine according to claim 1, characterized in that: The fixed cylinder (2) is a square cylinder, and the outer surface of each side wall of the fixed cylinder (2) is provided with two groups of support components (3), and each group of support components (3) is provided with three movable oil cylinders (6).

5. The hydraulic support device for the telescopic boom of a tunnel boring machine according to claim 2, characterized in that: The oil storage groove (18) comprises a plurality of first oil grooves (181) arranged along a first direction and a plurality of second oil grooves (182) arranged along a second direction, wherein the first oil grooves (181) and the second oil grooves (182) are interconnected and arranged vertically; The lubricating oil circuit (16) comprises a plurality of long lubricating oil circuits and short lubricating oil circuits arranged along a first direction.

6. The hydraulic support device for the telescopic boom of a tunnel boring machine according to claim 1, characterized in that: The movable oil cylinder (6) comprises a cylinder body (19) and a fixing portion (20) at the top of the cylinder body (19); the outer surface of the cylinder body (19) is provided with threads; the diameter of the fixing portion (20) is larger than the diameter of the cylinder body (19); the fixing portion (20) is bolted to the cover plate (4) via a plurality of movable bolts (7) arranged axially; and 10 movable bolts (7) are provided.

7. A gap adjustment method, based on the hydraulic support device of the telescopic cantilever of a tunnel boring machine according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: During the assembly of the boom of the tunnel boring machine, the telescopic cylinder (1) and the fixed cylinder (2) are installed, and the support assembly (3) is installed on the fixed cylinder (2); S2: A guide gap is preset between the slider (14) and the telescopic cylinder (1), and the movable oil cylinder (6) is rotated clockwise and tightened using a wrench until there is no contact gap between the movable oil cylinder (6), the slider (14) and the telescopic cylinder (1); S3: Use a wrench to loosen the movable oil cylinder (6) by rotating it counterclockwise until the preset guide clearance 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 oil cylinder (6) to complete the self-locking of the guide gap; S5: After the tunnel boring machine has been working for a period of time, the tunnel boring machine telescopic cylinder (1) is completely retracted into the fixed cylinder (2), the boom is operated to descend, the cutting head falls on the tunnel ground, and the motor is powered off and stopped; S6: Use a wrench to loosen the mounting bolts of the movable oil cylinder (6), then rotate the movable oil cylinder (6) clockwise to tighten it, and repeat steps S3 and S4 until the desired preset guide clearance value is obtained; S7: Use a wrench to tighten all the movable bolts (7) installed on the movable oil cylinder (6) to complete the adjustment of the guide clearance and self-locking.

8. The gap adjustment method according to claim 7, characterized in that: The guide gap between the slider (14) and the telescopic cylinder (1) is d1, the gap between the movable oil cylinder (6) and the slider (14) is d2, the gap between the movable oil cylinder (6) and the cover plate (4) is d3, and d1=d2=d3.

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

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