Heavy duty hydraulic shock absorbers with adjustable damping

Abstract

The utility model provides a heavy-duty hydraulic buffer with adjustable damping, including an oil tank, the oil tank is connected to a first chamber through a first main oil pipe, and the oil tank is connected to a second chamber through a second main oil pipe; a cylinder body is provided with a branch oil pipe, 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, and a first damping plug is provided in the branch oil pipe. A piston oil pipe is provided in the piston, and a second damping plug is provided in the piston oil pipe. The utility model can quickly and accurately adjust 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, and the cost of redesigning and producing the piston is reduced; at the same time, since the first damping plug and the second damping plug are both immovable parts, the reliability of the equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a hydraulic buffer, in particular to a heavy hydraulic buffer with adjustable damping. Background Art

[0002] In the prior art, the design scheme of adjustable damping used in hydraulic buffers is to use movable adjustment parts to change the flow cross section of the oil circuit through the movement of the parts, thereby changing the damping size of the liquid oil, thereby adjusting the buffering effect of the buffer. However, this type of structure has poor reliability under heavy and high pressure conditions, and the adjustment parts are difficult to process, the cost is high, and the damping cannot be accurately adjusted.

[0003] In addition, the damping adjustment range of the existing hydraulic buffer is small and the interchangeability of parts is poor. Utility Model Content

[0004] The utility model aims to provide a heavy-duty hydraulic buffer with adjustable damping, which is intended to solve the technical problems of poor reliability, low damping adjustment accuracy and high cost in the prior art.

[0005] The utility model can quickly and accurately adjust the damping of the hydraulic buffer by replacing the first damping plug in the branch oil pipe; expand the damping range of the hydraulic buffer by replacing the second damping plug in the piston oil pipe, and reduce the cost of redesigning and producing the piston; at the same time, because the first damping plug and the second damping plug are both immovable parts, the reliability of the equipment is improved.

[0006] A heavy-duty hydraulic buffer with adjustable damping, comprising a cylinder body, the cylinder body being provided with a piston, a first chamber being formed between the plug head of the piston and the top of the cylinder body, and a second chamber being formed between the plug head of the piston and the bottom of the cylinder body, characterized in that: the buffer comprises an oil tank, the oil tank is connected to the first chamber through a first main oil pipe, the oil tank is connected to the second chamber through 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 is connected to the second main oil pipe, the first bottom groove is connected to the second main oil pipe, An oil outlet hole is provided at the connection of the main oil pipe, and a ball plug is provided on the oil outlet hole. An anti-slip baffle is provided on the groove wall of the first bottom groove, and the anti-slip 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, and the top 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, and a first damping plug is provided in the branch oil pipe.

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

[0008] Furthermore, a first annular groove is arranged on the plug head of the piston, a guide belt is arranged in the first annular groove, a guide groove is arranged on the inner wall of the cylinder body, and the guide groove is slidably connected to the guide belt.

[0009] Furthermore, a second annular groove is arranged on the plug head of the piston, and a Gly ring is arranged in the second annular groove.

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

[0011] Furthermore, a pressure detection hole is provided on the cylinder body, the pressure detection hole is communicated with the second chamber, and a hole plug is provided in the pressure detection hole. Beneficial Effects

[0012] Compared with the prior art, the utility model has positive and obvious effects:

[0013] The effect of quickly and accurately adjusting the damping size is achieved by using the replaceable first damping plug.

[0014] The damping size can be further adjusted through a replaceable second damping plug, thereby increasing the adaptive damping range without changing the piston model and reducing the piston design and processing costs.

[0015] Through the coordination of the main oil pipe, the branch oil pipe and the piston oil pipe, the damping and slow-descent effect is achieved through a fixed pipeline structure, which reduces processing costs and improves equipment reliability.

[0016] The piston contacts the cylinder body through a Gly ring made of polytetrafluoroethylene, thereby improving the sealing effect and reducing the friction coefficient.

[0017] The guide strips and guide grooves improve the stability of the piston during movement.

[0018] The one-way flow effect is achieved through the ball plug, and the structure is simple and durable.

[0019] The piston is reset by the elastic force of the reset spring, achieving the piston lifting and reset effect.

[0020] The pressure detection hole is convenient for using a pressure detection tool to detect the pressure in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 .Schematic diagram of the structure of the embodiment.

[0022] Figure 2.Schematic diagram of a cross-sectional top view of the second chamber in the embodiment.

[0023] Figure 3 .Schematic diagram of the structure of the piston in the embodiment.

[0024] Figure 4 .Schematic diagram of the cross-sectional structure of the piston in the embodiment.

[0025] In the figure: 1 piston; 101 side hole; 102 first ring groove; 103 second ring groove; 104 piston oil pipe; 105 second damping plug; 2 cylinder body; 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 hole; 4 ball plug; 5 anti-drop baffle; 6 branch oil pipe; 601 blockage; 7 first damping plug; 8 return spring; 9 grid ring; 10 sealing ring; 11 guide belt; 12 first chamber; 13 second chamber. DETAILED DESCRIPTION

[0026] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0027] like Figures 1 to 4 As shown, this embodiment provides a heavy-duty hydraulic buffer with adjustable damping, including a cylinder body 2, the cylinder body 2 is provided with an upper opening, a piston 1 is provided in the cylinder body 2, the plug rod of the piston 1 passes through the opening of the cylinder body 2 and is connected to the outside, the plug head of the piston 1 is provided in the cylinder body 2, a first chamber 12 is formed between the plug head of the piston 1 and the top of the cylinder body 2, a second chamber 13 is formed between the plug head of the piston 1 and the bottom of the cylinder body 2, and hydraulic oil is provided in the first chamber 12 and the second chamber 13; the inner ring of the opening of the cylinder body 2 is provided with a sealing ring 10 to improve the sealing performance of the cylinder body 2. This connection form between the piston and the cylinder body is a commonly used connection form for buffers, and those skilled in the art should understand that the details will not be repeated here.

[0028] An oil tank 3 is provided outside the cylinder body 2, and hydraulic oil is provided in the oil tank 3. The hydraulic oil in the oil tank can be supplemented 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 with the first chamber 12 through the first main oil pipe 301, and the lower part of the oil tank 3 is connected with 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 hole 303, and the hydraulic oil in the first chamber 12 is transported to the oil tank 3 through the first main oil pipe 301, thereby realizing the hydraulic oil circulation effect between the cylinder body 2 and the oil tank 3.

[0029] At the bottom of the second chamber 13, a first bottom groove 202 is opened on the inner wall of the cylinder body 2. The first bottom groove 202 is a cylindrical groove body. The axis of the first bottom groove 202 is a cylindrical groove body perpendicular to the bottom surface of the cylinder body 2. 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. The ball plug 4 fits with the oil outlet hole 303 to achieve the effect of blocking the oil outlet hole 303. The diameter of the ball plug 4 is larger than the diameter of the oil outlet hole 303 but smaller than the diameter of the first bottom groove 202. The diameter of the groove 202 is large enough to allow the ball plug 4 to move up and down in the groove of the first bottom groove 202 while blocking the oil outlet hole 303; an anti-slip baffle 5 is provided on the groove wall of the first bottom groove 202, and the anti-slip baffle 5 is located above the ball plug 4, so as to prevent the ball plug 4 from slipping out of the first bottom groove 202; when the second main oil pipe 302 delivers oil to the second chamber 13, the ball plug 4 is lifted up, thereby opening the oil outlet hole 303; when the second main oil pipe 302 stops delivering oil to the second chamber 13, the ball plug 4 falls down, thereby closing the oil outlet hole 303, thereby achieving a one-way valve effect.

[0030] At the bottom of the second chamber 13, four second bottom grooves 203 are provided on the inner wall of the cylinder body 2. The second bottom grooves 203 are cylindrical groove bodies, and the axes of the second bottom grooves 203 are cylindrical groove bodies perpendicular to the bottom surface of the cylinder body 2. A return spring 8 is provided in each second bottom groove 203, and the top ends of the return springs 8 are connected to the bottom of the piston 1. The return springs 8 push the depressed piston 1 upward through elastic force, thereby achieving the effect of lifting and resetting the piston 1.

[0031] 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; a first damping plug 7 is threadedly connected to the lower part of the branch oil pipe 6, and an overflow hole is provided on the first damping plug 7. The aperture of the overflow hole determines the liquid flow cross-section of the oil circuit. By replacing the first damping plug 7 with different overflow hole apertures, the damping size of the liquid oil can be changed, thereby adjusting the buffering effect of the buffer; a through hole connected to the outside of the cylinder body 2 is provided next to the first damping plug 7, and 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 close to the through hole. After opening the plug 601, the first damping plug 7 can be taken out from the through hole by connecting it to the auxiliary blind hole (not shown in the figure) through a disassembly tool and rotating it, thereby achieving the effect of quickly replacing the first damping plug 7.

[0032] A piston oil pipe 104 is arranged in the piston 1, one end of the piston oil pipe 104 is connected with the bottom of the piston 1 to form a bottom hole, the bottom hole is connected with the second chamber 13, the other end of the piston oil pipe 104 is connected with the side of the piston 1 to form a side hole 101, the side hole 101 is connected with the first chamber 12; when the piston 1 is pressed downward, 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 arranged at the bottom hole of the piston oil pipe 104, and an overflow hole is also arranged on the second damping plug 105, and the damping size can be further adjusted by replacing the second damping plug 105 with different overflow hole diameters, thereby further adjusting the buffering effect of the buffer.

[0033] In actual use, the coarse adjustment of the damping range can be achieved by replacing the second damping plug 105, and the further fine adjustment of the damping range can be achieved by replacing the first damping plug 7. The coarse adjustment of the damping range by replacing the second damping plug 105 can adapt to different equipment without replacing the piston 1 parts, thereby reducing the cost of redesign and production; the fine adjustment of the damping range by replacing the first damping plug 7 can quickly and accurately adjust the damping size during use.

[0034] At the same time, since the first damping plug 7 and the second damping plug 105 are both immovable parts, compared with the hydraulic device in the prior art that uses movable parts to adjust the damping, this embodiment improves the reliability of the equipment, is sturdier and more durable, and has a lower cost.

[0035] Two first annular grooves 102 are arranged on the plug head of the piston 1, and a guide belt 11 is arranged in each of the two first annular grooves 102. The outer surface of the guide belt 11 is provided with a vertical guide strip, and the inner wall of the cylinder body 2 is provided with a vertical guide groove 204. The guide groove 204 and the guide belt 11 are slidably connected with each other, so as to prevent the piston 1 from rotating in the cylinder body 2 and improve the stability of the piston 1 during movement.

[0036] A second annular groove 103 is provided on the plug head of the piston 1, and the second annular groove 103 is provided between the two first annular grooves 102. A Gly ring 9 made of polytetrafluoroethylene is provided in the second annular groove 103. The piston 1 contacts with the cylinder body 2 through the Gly ring 9 made of polytetrafluoroethylene, thereby improving the sealing effect and reducing the friction coefficient. Polytetrafluoroethylene can also work normally under high pressure environment, further improving the reliability.

[0037] A pressure detection hole 201 is provided on the cylinder body 2 . The pressure detection hole 201 is a through hole connecting the second chamber 13 with the outside. A hole plug is connected to the inner thread of the pressure detection hole 201 .

[0038] The working principle of this embodiment:

[0039] When the piston 1 is pressed downward, the hydraulic oil in the second chamber 13 is squeezed into the first chamber 12 through the branch oil pipe 6, and 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 the second damping effect is achieved through the second damping plug 105 in the piston oil pipe 104; the ball plunger 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.

[0040] The piston 1 pressed downward is lifted and reset by the return spring 8 .

[0041] When the 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 plunger 4 is lifted up 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 resetting of the piston 1.

[0042] 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 a different overflow hole diameter, thereby achieving the effect of quickly adjusting the damping size.

[0043] When the equipment or weight to which the buffer is applied changes significantly, resulting in the need for significant adjustment of the damping, the second damping plug 105 on the piston 1 is replaced to further adjust the damping and expand the scope of application.

[0044] When it is necessary to detect the pressure in the cylinder body 2 , the hole plug on the pressure detection hole 201 is removed, and the pressure detector is installed and connected to the pressure detection hole 201 to detect the pressure in the cylinder body 2 .

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heavy-duty hydraulic buffer with adjustable damping, comprising a cylinder (2), wherein a piston (1) is arranged in the cylinder (2), characterized in that: A first chamber (12) is formed between the plug of the piston (1) and the top of the cylinder (2), and a second chamber (13) is formed between the plug of the piston (1) and the bottom of the cylinder (2); It comprises an oil tank (3), wherein the oil tank (3) is connected to the first chamber (12) via a first main oil pipe (301), and the oil tank (3) is connected to the second chamber (13) via a second main oil pipe (302); A first bottom groove (202) is provided at the bottom of the second chamber (13); the bottom end of the first bottom groove (202) is in communication with 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); an anti-slipping baffle (5) is provided on the groove wall of the first bottom groove (202); the anti-slipping baffle (5) is located above the ball plug (4); A second bottom groove (203) is also provided at the bottom of the second chamber (13), a return spring (8) is provided in the second bottom groove (203), and the top end of the return 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 in communication with the first chamber (12); the other end of the branch oil pipe (6) is in communication with the second chamber (13); a first damping plug (7) is provided in the branch oil pipe (6).

2. A heavy-duty hydraulic buffer with adjustable damping according to claim 1, characterized in that: A piston oil pipe (104) is arranged in 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), and a second damping plug (105) is arranged in the piston oil pipe (104).

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

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

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

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

Images