A drum telescopic oil cylinder for a rock drill

Abstract

This utility model relates to the field of hydraulic cylinder technology, specifically to a telescopic cylinder for a roadheader, comprising a cylinder body with a cavity inside. A piston rod is disposed within the cavity, with its end extending out of the cylinder body. A spacer block with several through holes is located at the bottom of the cavity. A piston is disposed at the bottom of the piston rod and is slidably connected to the inner wall of the cylinder body. A piston seal is also provided on the outer wall of the piston. A limiting sleeve is provided at the top of the piston and is fitted onto the piston rod. A guide sleeve is provided at the end of the cylinder body, through which the piston rod passes. This utility model effectively prevents deformation of the telescopic cylinder and improves the stability and reliability of cylinder operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a drum telescopic cylinder for a tunneling and anchoring machine. Background Technology

[0002] The core function of the roller telescopic cylinder is to achieve multi-stage telescopic movement driven by high-pressure hydraulic oil. However, under long-term dynamic load, impact vibration and temperature change conditions, the cylinder body is prone to deformation, leading to fatigue cracking or seal failure, which seriously affects the safety and service life of the equipment.

[0003] Existing anti-deformation technologies mainly include reinforcing rib design or pre-tightening structure, which places higher demands on the assembly precision of the hydraulic cylinder, thereby increasing the cost of the hydraulic cylinder. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a drum telescopic cylinder for a tunneling and anchoring machine, which effectively prevents deformation of the telescopic cylinder and improves the stability and reliability of cylinder operation.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a telescopic cylinder for a tunneling and anchoring machine, comprising a cylinder body, a cavity inside the cylinder body, a piston rod inside the cavity, the end of the piston rod extending out of the cylinder body, a spacer block at the bottom of the cavity, a plurality of through holes on the spacer block, a piston at the bottom of the piston rod, the piston being slidably connected to the inner wall of the cylinder body, a piston seal on the outer wall of the piston, a limiting sleeve at the top of the piston, the limiting sleeve being fitted onto the piston rod, a guide sleeve at the end of the cylinder body, and the piston rod passing through the guide sleeve.

[0006] As a further embodiment of this utility model: the piston is fixedly connected to the bottom of the piston rod by screws, and a first sealing ring is provided between the piston and the piston rod.

[0007] As a further improvement of this utility model, the diameter of the limiting sleeve is smaller than the diameter of the piston.

[0008] As a further improvement of this utility model: a second sealing ring is provided at the connection between the guide sleeve and the inner wall of the cylinder, and a relaxation piece is provided at the connection between the guide sleeve and the outer side of the cylinder.

[0009] As a further improvement of this utility model: the inner wall of the guide sleeve is provided with a guide ring and a third sealing ring, and the inner wall of the guide sleeve is also provided with a dustproof ring.

[0010] As a further embodiment of this utility model: the cavity includes a first cavity, a second cavity and a third cavity, a first oil port is provided on the side of the first cavity, a second oil port is provided on the side of the third cavity, and both the first oil port and the second oil port are connected to an oil pipe.

[0011] As a further embodiment of this utility model: a valve block is provided on the outer wall of the cylinder body, and a first cartridge valve and a second cartridge valve are provided on the valve block. The first cartridge valve is connected to the oil pipe and controls the amount of oil entering and exiting the first oil port; the second cartridge valve is connected to the oil pipe and controls the amount of oil entering and exiting the second oil port.

[0012] As a further improvement of this utility model, the oil pipe is provided with a protective cover.

[0013] As a further embodiment of this utility model: a pin hole is provided at the end of the piston rod, a pin is inserted into the pin hole, and an extension head is connected to the piston rod through the pin.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention effectively prevents deformation of the hydraulic cylinder due to impact and vibration during the extension and retraction process by adding a spacer block and a limiting sleeve inside the cylinder, thereby avoiding problems such as cylinder fatigue cracking and sealing failure, improving the stability and reliability of cylinder operation, and extending the service life of the cylinder. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the drum telescopic hydraulic cylinder for a roadheader according to the present invention;

[0017] Figure 2 This is a top view of the drum telescopic hydraulic cylinder for a roadheader according to the present invention;

[0018] In the diagram: 1. Cylinder block; 2. Cavity; 3. Piston rod; 4. Spacer block; 5. Through hole; 6. Piston; 7. Piston seal; 8. Limiting sleeve; 9. Guide sleeve; 10. Screw; 11. First sealing ring; 12. Second sealing ring; 13. Releasing plate; 14. Guide ring; 15. Third sealing ring; 16. Dustproof ring; 17. First cavity; 18. Second cavity; 19. Third cavity; 20. First oil port; 21. Second oil port; 22. Oil pipe; 23. Valve block; 24. First cartridge valve; 25. Second cartridge valve; 26. Protective cover; 27. Pin hole; 28. Pin shaft; 29. ​​Extension head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] refer to Figures 1 to 2 A telescopic cylinder for a tunneling and anchoring machine includes a cylinder body 1, a cavity 2 inside the cylinder body 1, a piston rod 3 inside the cavity 2, the end of the piston rod 3 extending out of the cylinder body 1, a spacer block 4 at the bottom of the cavity 2, a plurality of through holes 5 on the spacer block 4, a piston 6 at the bottom of the piston rod 3, the piston 6 being slidably connected to the inner wall of the cylinder body 1, a piston seal 7 on the outer wall of the piston 6, a limiting sleeve 8 at the top of the piston 6, the limiting sleeve 8 being fitted onto the piston rod 3, and a guide sleeve 9 at the end of the cylinder body 1, through which the piston rod 3 passes.

[0021] The piston 6 is fixedly connected to the bottom of the piston rod 3 by screws 10, and a first sealing ring 11 is provided between the piston 6 and the piston rod 3.

[0022] The diameter of the limiting sleeve 8 is smaller than the diameter of the piston 6.

[0023] A second sealing ring 12 is provided at the connection between the guide sleeve 9 and the inner wall of the cylinder body 1, and a relaxation piece 13 is provided at the connection between the guide sleeve 9 and the outer side of the cylinder body 1.

[0024] The inner wall of the guide sleeve 9 is provided with a guide ring 14 and a third sealing ring 15, and the inner wall of the guide sleeve 9 is also provided with a dustproof ring 16.

[0025] Cavity 2 includes a first cavity 17, a second cavity 18 and a third cavity 19. A first oil port 20 is provided on the side of the first cavity 17, and a second oil port 21 is provided on the side of the third cavity 19. Both the first oil port 20 and the second oil port 21 are connected to the oil pipe 22.

[0026] A valve block 23 is provided on the outer wall of the cylinder 1. A first cartridge valve 24 and a second cartridge valve 25 are provided on the valve block 23. The first cartridge valve 24 is connected to the oil pipe 22 and controls the oil flow rate of the first oil port 20. The second cartridge valve 25 is connected to the oil pipe 22 and controls the oil flow rate of the second oil port 21.

[0027] The oil pipe 22 is equipped with a protective cover 26.

[0028] The piston rod 3 has a pin hole 27 at its end, and a pin 28 is inserted into the pin hole 27. The piston rod 3 is connected to an extension head 29 through the pin 28.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A drum telescopic cylinder for a roadheader, comprising a cylinder body (1), wherein a cavity (2) is provided inside the cylinder body (1), and a piston rod (3) is provided inside the cavity (2), the end of the piston rod (3) extending out of the cylinder body (1), characterized in that: The cavity (2) has a spacer block (4) at the bottom, and several through holes (5) are provided on the spacer block (4). The piston rod (3) has a piston (6) at the bottom, and the piston (6) is slidably connected to the inner wall of the cylinder (1). The piston (6) also has a piston seal (7) on the outer wall of the piston (6). The piston (6) has a limiting sleeve (8) at the top, and the limiting sleeve (8) is fitted on the piston rod (3). The cylinder (1) has a guide sleeve (9) at the end, and the piston rod (3) passes through the guide sleeve (9).

2. The drum telescopic cylinder for a roadheader according to claim 1, characterized in that: The piston (6) is fixedly connected to the bottom of the piston rod (3) by screws (10), and a first sealing ring (11) is provided between the piston (6) and the piston rod (3).

3. The drum telescopic cylinder for a roadheader according to claim 2, characterized in that: The diameter of the limiting sleeve (8) is smaller than the diameter of the piston (6).

4. The drum telescopic cylinder for a roadheader according to claim 3, characterized in that: A second sealing ring (12) is provided at the connection between the guide sleeve (9) and the inner wall of the cylinder (1), and a relaxation piece (13) is provided at the connection between the guide sleeve (9) and the outer side of the cylinder (1).

5. The drum telescopic cylinder for a roadheader according to claim 4, characterized in that: The inner wall of the guide sleeve (9) is provided with a guide ring (14) and a third sealing ring (15), and the inner wall of the guide sleeve (9) is also provided with a dustproof ring (16).

6. The drum telescopic cylinder for a roadheader according to claim 5, characterized in that: The cavity (2) includes a first cavity (17), a second cavity (18) and a third cavity (19). The first cavity (17) has a first oil port (20) on its side, and the third cavity (19) has a second oil port (21) on its side. Both the first oil port (20) and the second oil port (21) are connected to the oil pipe (22).

7. The drum telescopic cylinder for a roadheader according to claim 6, characterized in that: The cylinder body (1) is provided with a valve block (23) on its outer wall. The valve block (23) is provided with a first cartridge valve (24) and a second cartridge valve (25). The first cartridge valve (24) is connected to the oil pipe (22) and controls the amount of oil entering and exiting the first oil port (20). The second cartridge valve (25) is connected to the oil pipe (22) and controls the amount of oil entering and exiting the second oil port (21).

8. The drum telescopic cylinder for a roadheader according to claim 7, characterized in that: The oil pipe (22) is equipped with a protective cover (26).

9. The drum telescopic cylinder for a roadheader according to claim 8, characterized in that: The piston rod (3) has a pin hole (27) at its end, and a pin (28) is inserted into the pin hole (27). The piston rod (3) is connected to an extension head (29) through the pin (28).

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