Heavy hydraulic buffer with adjustable damping

Abstract

The invention provides a damping-adjustable heavy hydraulic buffer which comprises an oil tank, the oil tank is communicated with a first cavity through a first main oil pipe, and the oil tank is communicated with a second cavity through a second main oil pipe; the cylinder body is provided with a branch oil pipe, one end of the branch oil pipe is communicated with the first cavity, the other end of the branch oil pipe is communicated with the second cavity, and a first damping plug is arranged in the branch oil pipe. A piston oil pipe is arranged in the piston, and a second damping plug is arranged in the piston oil pipe. Damping of the hydraulic buffer is rapidly and accurately adjusted by replacing the first damping plug in the branch oil pipe; by replacing the second damping plug in the piston oil pipe, the damping range of the hydraulic buffer is expanded, and the cost for redesigning and producing the piston is reduced; and meanwhile, the first damping plug and the second damping plug are inmovable parts, so that the equipment reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of machinery, and more particularly to hydraulic dampers, especially a heavy-duty hydraulic damper with adjustable damping. Background Technology

[0002] In existing technologies, the adjustable damping design used in hydraulic buffers utilizes movable adjusting parts. By changing the movement of these parts, the cross-section of the oil flow changes, thus altering the damping magnitude on the liquid oil and adjusting the buffer's cushioning effect. However, this type of structure has poor reliability under heavy-duty, high-pressure conditions, and the adjusting parts are difficult and costly to manufacture, and the damping cannot be precisely adjusted.

[0003] In addition, the existing hydraulic buffers have a small damping adjustment range and poor component interchangeability. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable damping heavy-duty hydraulic buffer, which aims to solve the technical problems of poor reliability, low damping adjustment accuracy and high cost in the prior art.

[0005] This invention enables rapid and precise adjustment of the damping of the hydraulic buffer by replacing the first damping plug in the branch oil pipe; by replacing the second damping plug in the piston oil pipe, the damping range of the hydraulic buffer is expanded, reducing the cost of redesigning and manufacturing the piston; at the same time, since both the first and second damping plugs are immovable parts, the reliability of the equipment is improved.

[0006] An adjustable damping heavy-duty hydraulic shock absorber includes a cylinder body, a piston disposed within the cylinder body, a first chamber formed between the piston's plug and the top of the cylinder body, and a second chamber formed between the piston's plug and the bottom of the cylinder body. The shock absorber is characterized by: including an oil tank, the oil tank being connected to the first chamber via a first main oil pipe, and the oil tank being connected to the second chamber via a second main oil pipe; a first bottom groove is provided at the bottom of the second chamber, the bottom end of the first bottom groove being connected to the second main oil pipe, and the first bottom groove being connected to the first... An oil outlet is provided at the connection of the two main oil pipes, and a ball plug is provided on the oil outlet. An anti-disengagement baffle is provided on the wall of the first bottom groove, and the anti-disengagement baffle is located above the ball plug. A second bottom groove is also provided at the bottom of the second chamber, and a return spring is provided in the second bottom groove. The top end of the return spring is connected to the bottom end of the piston. A branch oil pipe is provided on one side of the cylinder body. One end of the branch oil pipe is connected to the first chamber, and the other end of the branch oil pipe is connected to the second chamber. A first damping plug is provided in the branch oil pipe.

[0007] Furthermore, a piston oil pipe is provided inside the piston, one end of which is connected to the bottom surface of the piston, and the other end of which is connected to the side surface of the piston to form a side hole. A second damping plug is provided inside the piston oil pipe.

[0008] Furthermore, the piston head is provided with a first annular groove, a guide band is provided in the first annular groove, and a guide groove is provided on the inner wall of the cylinder, the guide groove and the guide band being slidably connected.

[0009] Furthermore, the piston head is provided with a second annular groove, and a Gladwell ring is provided in the second annular groove.

[0010] Furthermore, the material of the Gladley ring is polytetrafluoroethylene.

[0011] Furthermore, the cylinder body is provided with a pressure detection hole, which communicates with the second chamber, and a plug is provided inside the pressure detection hole.

[0012] Beneficial effects

[0013] Compared with existing technologies, the effects of this invention are positive and obvious:

[0014] 1. The damping magnitude can be quickly and precisely adjusted by using a replaceable first damping plug.

[0015] 2. The damping magnitude can be further adjusted by using a replaceable second damping plug, thereby increasing the adaptability of the damping range without changing the piston model and reducing piston design and manufacturing costs.

[0016] 3. By coordinating the main oil pipe, branch oil pipe and piston oil pipe, a damping and slow-descent effect is achieved through a fixed pipeline structure, reducing processing costs and improving equipment reliability.

[0017] 4. The piston contacts the cylinder through a Glyd ring made of polytetrafluoroethylene, thereby improving the sealing effect and reducing the coefficient of friction.

[0018] 5. Improve the stability of piston movement by using guide belts and guide grooves.

[0019] 6. The ball plug achieves unidirectional flow, and the structure is simple and durable.

[0020] 7. The piston is driven to return to its original position by the elastic force of the return spring, thus achieving the effect of lifting and resetting the piston.

[0021] 8. The pressure testing port facilitates the use of pressure testing tools to test the pressure inside the cylinder. Attached Figure Description

[0022] Figure 1 Schematic diagram of the embodiment.

[0023] Figure 2 A top-view cross-sectional view of the second chamber in the embodiment.

[0024] Figure 3 A schematic diagram of the piston structure in the embodiment.

[0025] Figure 4 A cross-sectional view of the piston in the embodiment.

[0026] In the diagram: 1 Piston; 101 Side Hole; 102 First Annular Groove; 103 Second Annular Groove; 104 Piston Oil Pipe; 105 Second Damping Plug; 2 Cylinder Block; 201 Pressure Detection Hole; 202 First Bottom Groove; 203 Second Bottom Groove; 204 Guide Groove; 3 Oil Tank; 301 First Main Oil Pipe; 302 Second Main Oil Pipe; 303 Oil Outlet; 4 Ball Plug; 5 Anti-detachment Baffle; 6 Branch Oil Pipe; 601 Block; 7 First Damping Plug; 8 Return Spring; 9 Glyd Ring; 10 Sealing Ring; 11 Guide Strip; 12 First Chamber; 13 Second Chamber. Detailed Implementation

[0027] The following embodiments will further illustrate the present invention, but are not intended to limit the invention.

[0028] like Figures 1 to 4 As shown, this embodiment provides an adjustable damping heavy-duty hydraulic shock absorber, including a cylinder body 2 with an upper opening. A piston 1 is disposed inside the cylinder body 2, with the piston rod passing through the opening and connecting to the outside. The piston head is disposed inside the cylinder body 2, forming a first chamber 12 between the piston head and the top of the cylinder body 2, and a second chamber 13 between the piston head and the bottom of the cylinder body 2. Hydraulic oil is disposed in the first chamber 12 and the second chamber 13. A sealing ring 10 is provided on the inner ring of the opening of the cylinder body 2 to improve the sealing performance of the cylinder body 2. This piston and cylinder connection is a commonly used connection method for shock absorbers, which should be understood by those skilled in the art, and will not be described in detail here.

[0029] An oil tank 3 is provided on the outside of the cylinder body 2. The oil tank 3 is filled with hydraulic oil, which can be replenished through the filling port (not shown in the figure) on the top of the oil tank 3. The upper part of the oil tank 3 is connected to the first chamber 12 through the first main oil pipe 301, and the lower part of the oil tank 3 is connected to the second chamber 13 through the second main oil pipe 302. The hydraulic oil in the oil tank 3 is transported to the second chamber 13 through the oil outlet 303, and the hydraulic oil in the first chamber 12 is transported to the oil tank 3 through the first main oil pipe 301, so as to realize the hydraulic oil circulation effect between the cylinder body 2 and the oil tank 3.

[0030] At the bottom of the second chamber 13, a first bottom groove 202 is formed on the inner wall of the cylinder 2. The first bottom groove 202 is a cylindrical groove with its axis perpendicular to the bottom surface of the cylinder 2. The bottom end of the first bottom groove 202 is connected to the second main oil pipe 302. An oil outlet 303 is provided at the connection between the first bottom groove 202 and the second main oil pipe 302. A ball plug 4 is provided on the oil outlet 303. The ball plug 4 fits against the oil outlet 303 to block the oil outlet 303. The diameter of the ball plug 4 is larger than the diameter of the oil outlet 303 but smaller than the diameter of the first bottom groove 202. The diameter of the groove 202 allows the ball plug 4 to move up and down within the groove of the first bottom groove 202 while blocking the oil outlet 303; an anti-detachment baffle 5 is provided on the groove wall of the first bottom groove 202, and the anti-detachment baffle 5 is located above the ball plug 4 to prevent the ball plug 4 from detaching from the first bottom groove 202; when the second main oil pipe 302 supplies oil to the second chamber 13, the ball plug 4 is pushed up, thereby opening the oil outlet 303; when the second main oil pipe 302 stops supplying oil to the second chamber 13, the ball plug 4 falls down, thereby closing the oil outlet 303, thus achieving the effect of a one-way valve.

[0031] At the bottom of the second chamber 13, four second bottom grooves 203 are also provided on the inner wall of the cylinder 2. The second bottom grooves 203 are cylindrical grooves with their axes perpendicular to the bottom surface of the cylinder 2. Each second bottom groove 203 is provided with a return spring 8. The top of the return spring 8 is connected to the bottom of the piston 1. The return spring 8 pushes the piston 1 upward through its elastic force, thereby achieving the effect of lifting and resetting the piston 1.

[0032] A branch oil pipe 6 is provided on one side of the cylinder body 2. One end of the branch oil pipe 6 is connected to the first chamber 12, and the other end of the branch oil pipe 6 is connected to the second chamber 13. When the piston 1 is pressed down, the hydraulic oil in the second chamber 13 is squeezed into the first chamber 12 through the branch oil pipe 6. The lower part of the branch oil pipe 6 is threadedly connected to a first damping plug 7. The first damping plug 7 is provided with an overflow hole. The diameter of the overflow hole determines the flow cross section of the oil circuit. By replacing the first damping plug 7 with a different overflow hole diameter, the damping of the liquid oil can be changed, thereby adjusting the buffering effect of the buffer. A through hole connecting to the outside of the cylinder body 2 is provided next to the first damping plug 7. A plug 601 is threadedly connected to the through hole. An auxiliary blind hole (not shown in the figure) is provided on the side of the first damping plug 7 near the through hole. After opening the plug 601, the first damping plug 7 can be removed from the through hole by connecting it to the auxiliary blind hole (not shown in the figure) with a disassembly tool and rotating it, thus achieving the effect of quickly replacing the first damping plug 7.

[0033] A piston oil pipe 104 is provided inside the piston 1. One end of the piston oil pipe 104 is connected to the bottom of the piston 1 to form a bottom hole, which is connected to the second chamber 13. The other end of the piston oil pipe 104 is connected to the side of the piston 1 to form a side hole 101, which is connected to the first chamber 12. When the piston 1 is pressed down, the hydraulic oil in the second chamber 13 is squeezed into the first chamber 12 through the piston oil pipe 104. A second damping plug 105 is provided at the bottom hole of the piston oil pipe 104. An overflow hole is also provided on the second damping plug 105. By replacing the second damping plug 105 with different overflow hole diameters, the damping size can be further adjusted, thereby further adjusting the buffering effect of the buffer.

[0034] In practical use, the damping range can be coarsely adjusted by replacing the second damping plug 105, and further finely adjusted by replacing the first damping plug 7. Replacing the second damping plug 105 for coarse adjustment allows for adaptation to different equipment without replacing the piston 1, thus reducing redesign and manufacturing costs. Replacing the first damping plug 7 for fine adjustment allows for quick and precise adjustment of the damping magnitude during use.

[0035] Meanwhile, since both the first damping plug 7 and the second damping plug 105 are non-movable parts, compared with the hydraulic devices in the prior art that use moving parts to adjust damping, this embodiment improves the reliability of the equipment, makes it robust and durable, and has a lower cost.

[0036] The piston 1 has two first annular grooves 102 on its plug head. Each of the two first annular grooves 102 has a guide band 11. The outer surface of the guide band 11 has a vertical guide strip. The inner wall of the cylinder 2 has a vertical guide groove 204. The guide groove 204 and the guide band 11 are slidably connected to each other, thereby preventing the piston 1 from rotating in the cylinder 2 and improving the stability of the piston 1 during movement.

[0037] The piston 1 has a second annular groove 103 on its plug head, which is located between two first annular grooves 102. A polytetrafluoroethylene (PTFE) glyd ring 9 is installed in the second annular groove 103. The piston 1 contacts the cylinder 2 through the PTFE glyd ring 9, thereby improving the sealing effect and reducing the friction coefficient. PTFE can also work normally under high pressure, further improving reliability.

[0038] The cylinder body 2 is provided with a pressure detection hole 201, which is a through hole connecting the second chamber 13 to the outside. The pressure detection hole 201 is internally threaded with a plug.

[0039] The working principle of this embodiment:

[0040] When piston 1 is pressed down, the hydraulic oil in the second chamber 13 is squeezed into the first chamber 12 through the branch oil pipe 6, and at the same time, the first damping effect is achieved through the first damping plug 7 in the branch oil pipe 6; the hydraulic oil in the second chamber 13 is also squeezed into the first chamber 12 through the piston oil pipe 104, and at the same time, the second damping effect is achieved through the second damping plug 105 in the piston oil pipe 104; the ball plug 4 blocks the oil outlet 303 601 due to gravity and the pressure of the hydraulic oil, preventing the hydraulic oil in the second chamber 13 from being transported to the oil tank 3 through the second main oil pipe 302.

[0041] The depressed piston 1 is lifted and reset by the return spring 8.

[0042] When piston 1 is lifted, the hydraulic oil in the first chamber 12 is transported to the oil tank 3 through the first main oil pipe 301, the ball plug 4 is lifted by the oil pressure, and the hydraulic oil in the oil tank 3 is transported to the second chamber 13 through the second main oil pipe 302, thereby realizing the rapid lifting and reset of piston 1.

[0043] When the damping of the buffer needs to be adjusted, remove the plug 601 on the branch oil pipe 6, use a disassembly tool to remove the first damping plug 7, and replace the first damping plug 7 with one of different overflow hole diameters, thereby achieving the effect of quickly adjusting the damping size.

[0044] When the equipment or weight to which the buffer is applicable changes significantly, requiring a large adjustment of the damping, the second damping plug 105 on piston 1 is replaced to further adjust the damping and expand the applicable range.

[0045] When it is necessary to detect the pressure in cylinder 2, remove the plug on the pressure detection hole 201, install and connect the pressure detector to the pressure detection hole 201, and detect the pressure in cylinder 2.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heavy-duty hydraulic shock absorber with adjustable damping, comprising a cylinder (2) and a piston (1) disposed within the cylinder (2), characterized in that: The piston (1) has a first chamber (12) between its plug head and the top of the cylinder (2), and a second chamber (13) between its plug head and the bottom of the cylinder (2). It includes an oil tank (3), which is connected to a first chamber (12) via a first main oil pipe (301) and to a second chamber (13) via a second main oil pipe (302); The bottom of the second chamber (13) is provided with a first bottom groove (202), the bottom end of the first bottom groove (202) is connected to the second main oil pipe (302), an oil outlet hole (303) is provided at the connection between the first bottom groove (202) and the second main oil pipe (302), a ball plug (4) is provided on the oil outlet hole (303), and an anti-detachment baffle (5) is provided on the groove wall of the first bottom groove (202), the anti-detachment baffle (5) is located above the ball plug (4); The bottom of the second chamber (13) is also provided with a second bottom groove (203), and a reset spring (8) is provided in the second bottom groove (203). The top end of the reset spring (8) is connected to the bottom end of the piston (1). A branch oil pipe (6) is provided on one side of the cylinder body (2). One end of the branch oil pipe (6) is connected to the first chamber (12), and the other end of the branch oil pipe (6) is connected to the second chamber (13). A first damping plug (7) is provided inside the branch oil pipe (6).

2. The heavy-duty adjustable damping hydraulic buffer according to claim 1, characterized in that: A piston oil pipe (104) is provided inside the piston (1). One end of the piston oil pipe (104) is connected to the bottom surface of the piston (1) to form a bottom hole, and the other end of the piston oil pipe (104) is connected to the side surface of the piston (1) to form a side hole (101). A second damping plug (105) is provided inside the piston oil pipe (104).

3. The heavy-duty adjustable damping hydraulic buffer according to claim 1, characterized in that: The piston (1) has a first annular groove (102) on its plug head, and a guide band (11) is provided in the first annular groove (102). The cylinder body (2) has a guide groove (204) on its inner wall, and the guide groove (204) is slidably connected to the guide band (11).

4. The heavy-duty adjustable damping hydraulic buffer according to claim 1, characterized in that: The piston (1) has a second annular groove (103) on its plug head, and a Gladley ring (9) is provided in the second annular groove (103).

5. The heavy-duty adjustable damping hydraulic buffer according to claim 4, characterized in that: The material of the Gladius ring (9) is polytetrafluoroethylene.

6. The heavy-duty adjustable damping hydraulic buffer according to claim 1, characterized in that: The cylinder (2) is provided with a pressure detection hole (201), which is connected to the second chamber (13), and a plug is provided inside the pressure detection hole (201).

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