Hydrostatic support cylinder with damping mechanism

Abstract

This utility model relates to a hydrostatic support cylinder with a buffer mechanism, comprising a cylinder body with an oil chamber for oil flow. A base plate and a cover plate are connected to both sides of the cylinder body. A guide sleeve is also provided on each side of the cylinder body, and two oil ports communicating with the oil chamber are provided on each side of the cylinder body. A certain gap is left between the oil ports and the adjacent guide sleeves, and a buffer zone is defined as the area of ​​the oil chamber within this gap. A piston rod, which cooperates with the cylinder body, is placed in the oil chamber of the cylinder body, and a piston is also mounted on the piston rod and placed in the oil chamber. A buffer mechanism is provided on the outer wall of the cylinder body, including a buffer seat and a control valve. Two buffer oil passages, corresponding one-to-one with the oil ports, are opened on the buffer seat, and a buffer regulating valve is installed on the buffer seat at the buffer oil passages. The cylinder of this utility model, by forming a buffer zone between the oil ports and the guide sleeves, cooperates with the piston's movement, preventing the piston from rapidly impacting the guide sleeves and causing damage to the cylinder.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder, and more particularly to a hydrostatic support hydraulic cylinder with a buffer mechanism. Background Technology

[0002] Currently, hydrostatic support cylinders are highly integrated hydraulic actuators composed of a cylinder barrel, guide sleeve, and piston rod. The extension and retraction of the cylinder are controlled by the switching of a servo valve. However, because hydrostatic support cylinders are often used in high-speed applications, with speeds frequently exceeding 2.5 m / s, if the servo valve malfunctions, causing the piston to rapidly impact the guide sleeve, the impact force is extremely large and can easily damage the guide sleeve. Therefore, a buffer mechanism is needed to prevent the piston rod from directly impacting the guide sleeve.

[0003] Although traditional hydrostatic support cylinders have a buffer distance, they lack a buffer mechanism, which can easily lead to cylinder collision. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a hydrostatic support cylinder with a buffer mechanism, which can reduce the speed of the piston and avoid impact on the guide sleeve even when the control valve is out of control.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a hydrostatic support cylinder with a buffer mechanism, the innovation of which is: including

[0006] A cylinder body has an oil chamber for oil flow. A bottom plate and a cover plate are connected to both sides of the cylinder body. A guide sleeve is also provided on the bottom plate and the cover plate on both sides of the cylinder body. Two oil ports connected to the oil chamber are also provided on both sides of the cylinder body, and the two oil ports are each other's inlet / outlet ports. A certain gap is left between the oil port and the adjacent guide sleeve, and a buffer zone is defined for the oil chamber within the gap.

[0007] A piston rod that cooperates with a cylinder body is placed in the oil chamber of the cylinder body, and the two sides of the piston rod extend from the two sides of the cylinder body respectively. At the same time, through holes are opened on the bottom plate, cover plate and guide sleeve to allow the piston rod to pass through and move. A piston is also installed on the piston rod and placed in the oil chamber, and the piston reciprocates between the two oil ports.

[0008] A buffer mechanism is provided on the outer wall of the cylinder body. The buffer mechanism includes a buffer seat and a control valve installed on the outer wall of the buffer seat. Two buffer oil passages are opened on the buffer seat and are connected to the oil ports. A buffer regulating valve is also installed on the buffer seat at the location of the buffer oil passages.

[0009] Furthermore, the buffer regulating valve includes a combined valve body, which includes a first valve body, a second valve body, and a third valve body distributed sequentially from the inside to the outside. The first valve body, the second valve body, and the third valve body are all hollow tube structures with openings at both ends. The first valve body and the second valve body are both installed on the same side of the third valve body. A valve stem is installed in the first valve body, and one side of the first valve body is sealed by a lock nut. The other side of the third valve body is an inlet and outlet port, which is the first inlet and outlet port, thereby forming a one-way flow channel in the combined valve body. A one-way valve is also provided at the first inlet and outlet port. Another inlet and outlet port connected to the flow channel is also opened on the outer wall of the third valve body, which is the second inlet and outlet port. The lock nut extends into the first valve body, and a groove for the valve stem to extend into is also opened on one side of the lock nut. A throttling valve is also provided on the side of the valve stem away from the lock nut.

[0010] When the hydraulic cylinder retracts, the one-way valve closes, and the oil flows from the first inlet / outlet to the second inlet / outlet after passing through the throttle valve, thus achieving the slow retraction of the hydraulic cylinder.

[0011] When the cylinder extends, the oil does not pass through the throttle valve, but flows directly from the second inlet / outlet to the first inlet / outlet through the check valve, thus achieving rapid extension of the cylinder.

[0012] Furthermore, the horizontal length of the buffer is less than the horizontal length of the piston.

[0013] The advantages of this utility model are as follows: The oil cylinder in this utility model cooperates with the piston's movement by forming a buffer zone between the oil port and the guide sleeve, thereby throttling the oil, limiting the minimum buffer speed of the oil cylinder, and preventing the piston from rapidly impacting the guide sleeve, which would damage the oil cylinder.

[0014] The design of the buffer regulating valve uses a combination of a throttle valve and a check valve to adjust the speed of the piston within the buffer zone, thus slowing down the piston's entry into the buffer zone and speeding up its exit from the buffer zone.

[0015] The horizontal length of the buffer zone is designed to be less than the horizontal length of the piston in order to prevent the piston from moving directly beyond the oil port when it reaches the end position, thus preventing it from returning and affecting the smooth operation of the subsequent oil cylinder. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hydrostatic support cylinder with a buffer mechanism according to the present invention.

[0017] Figure 2 This is a side view of the hydrostatic support cylinder with a buffer mechanism according to this utility model.

[0018] Figure 3 for Figure 2AA sectional view.

[0019] Figure 4 This is a schematic diagram of the buffer regulating valve in this utility model. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] like Figures 1-4 The illustrated hydrostatic support cylinder with a buffer mechanism includes...

[0022] A cylinder body 1 is cylindrical in shape and has an oil chamber for oil flow inside. A base plate 12 and a cover plate 11 are connected to both sides of the cylinder body 1. Both the base plate 12 and the cover plate 11 are disc structures, and the size of the base plate 12 is larger than that of the cover plate 11. The base plate 12 and the cover plate 11 are fixed to the cylinder body 1 by several screws. A guide sleeve 13 is also provided on both sides of the cylinder body 1 at the base plate 12 and the cover plate 11 respectively. Several annular sealing rings are also provided between the outer wall of the guide sleeve 13 and the inner wall of the cylinder body 1. Two oil ports 14 connected to the oil chamber are also provided on both sides of the cylinder body 1, and the two oil ports 14 are the inlet and outlet of each other. A certain gap is left between the oil port 14 and the adjacent guide sleeve 13, and the area of ​​the oil chamber in the gap is defined as a buffer zone 15.

[0023] A piston rod 2 is fitted to the cylinder 1. The piston rod 2 is placed in the oil chamber of the cylinder 1, and the two sides of the piston rod 2 extend from the two sides of the cylinder 1 respectively. At the same time, through holes are opened on the bottom plate 12, the cover plate 11 and the guide sleeve 13 to allow the piston rod 2 to pass through and move. A piston 21 is also installed on the piston rod 2 and placed in the oil chamber. The piston 21 moves back and forth between the two oil ports 14 with the piston rod 2. The piston 21 is cylindrical and the outer wall of the piston 21 is in close contact with the inner wall of the cylinder 1. Several annular grooves are also provided on the outer circumference of the piston 21. Each groove and the inner wall of the cylinder 1 cooperate to form a flow channel for the flow of oil.

[0024] The horizontal length of the buffer zone 15 is less than the horizontal length of the piston 21. The reason for designing the horizontal length of the buffer zone 15 to be less than the horizontal length of the piston 21 is to prevent the piston 21 from directly exceeding the oil port 14 when it moves to the end position of the oil chamber, thus preventing it from returning to its original position and affecting the smooth operation of the subsequent oil cylinder.

[0025] A buffer mechanism is provided on the outer wall of the cylinder body 1. The buffer mechanism includes a buffer seat 3 and a control valve 4 installed on the outer wall of the buffer seat 3. Two buffer oil passages 31 are opened on the buffer seat 3 and are connected to the oil port 14 in a one-to-one correspondence. The two buffer oil passages 31 are connected to the oil port 14. A buffer regulating valve 5 is also installed on the buffer seat 3 at the buffer oil passages 31.

[0026] like Figure 4 As shown in the schematic diagram, the buffer regulating valve 5 includes a combined valve body, which comprises a first valve body 53, a second valve body 52, and a third valve body 51 arranged sequentially from the inside out. Each of the three valve bodies is a hollow tube structure with openings at both ends. The inner walls of the first valve body 53, second valve body 52, and third valve body 51 are in close contact with each other, and the first valve body 53 and second valve body 52 are both installed on the same side of the third valve body 51. A valve stem 57 is installed inside the first valve body 53, and one side of the first valve body 53 is sealed by a lock nut 58. The other side of the third valve body 51 is open. The inlet and outlet are designated as the first inlet and outlet port 59, thereby forming a one-way flow channel within the combined valve body. A one-way valve 55 is also provided at the first inlet and outlet port 59. Another inlet and outlet port connected to the flow channel is also provided on the outer wall of the third valve body 51. This inlet and outlet port is the second inlet and outlet port 54. The lock nut 58 extends into the first valve body 53, and a groove for the valve stem 57 to extend and move is provided on one side of the lock nut 58. A throttle valve 56 is also provided on the side of the valve stem 57 away from the lock nut 58, and the throttle valve 56 is located at the second inlet and outlet port 54 and is connected to the second inlet and outlet port 54.

[0027] When the hydraulic cylinder retracts, the one-way valve 55 closes, and the oil flows from the first inlet / outlet 59 through the throttle valve 56 to the second inlet / outlet 54, and then flows into the buffer oil passage 31 from the second inlet / outlet 54, thus realizing the slow retraction of the hydraulic cylinder.

[0028] When the hydraulic cylinder extends, the hydraulic fluid bypasses the throttle valve 56 and flows directly from the second inlet / outlet 54 through the check valve 55 to the first inlet / outlet 59, and then flows from the first inlet / outlet 59 into the outlet 14, achieving rapid extension of the hydraulic cylinder. Regarding the design of the buffer regulating valve, the cooperation between the throttle valve 56 and the check valve 55 allows for adjustment of the speed of the piston 21 within the buffer zone 15, slowing down the speed at which the piston 21 enters the buffer zone 15 and speeding up the speed at which it leaves the buffer zone 15.

[0029] During operation, after piston 21 enters buffer zone 15, piston 21 first covers oil port 14. Then, the oil in buffer zone 15 can only flow out of the cylinder through two oil paths. One oil path flows out from the gap between piston 21 and cylinder 1 to oil port 14. The gap between piston 21 and cylinder 1 is generally 0.02mm. This gap can greatly reduce the speed of piston rod 2 in buffer zone 15 and avoid cylinder collision. The second oil path enters the first inlet / outlet oil port 59 through the interface of buffer regulating valve 5. The throttle port of buffer regulating valve 5 can be adjusted from 0-6mm, which can be adjusted according to the speed of the cylinder entering buffer zone 15. The speed of piston 21 entering buffer zone 15 is also completely controllable.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hydrostatic support cylinder with a buffer mechanism, characterized in that: include A cylinder body has an oil chamber for oil flow. A bottom plate and a cover plate are connected to both sides of the cylinder body. A guide sleeve is also provided on the bottom plate and the cover plate on both sides of the cylinder body. Two oil ports connected to the oil chamber are also provided on both sides of the cylinder body, and the two oil ports are each other's inlet / outlet ports. A certain gap is left between the oil port and the adjacent guide sleeve, and a buffer zone is defined for the oil chamber within the gap. A piston rod that cooperates with a cylinder body is placed in the oil chamber of the cylinder body, and the two sides of the piston rod extend from the two sides of the cylinder body respectively. At the same time, through holes are opened on the bottom plate, cover plate and guide sleeve to allow the piston rod to pass through and move. A piston is also installed on the piston rod and placed in the oil chamber, and the piston reciprocates between the two oil ports. A buffer mechanism is provided on the outer wall of the cylinder body. The buffer mechanism includes a buffer seat and a control valve installed on the outer wall of the buffer seat. Two buffer oil passages are opened on the buffer seat and are connected to the oil ports. A buffer regulating valve is also installed on the buffer seat at the location of the buffer oil passages.

2. The hydrostatic support cylinder with a buffer mechanism according to claim 1, characterized in that: The buffer regulating valve includes a combined valve body, which comprises a first valve body, a second valve body, and a third valve body arranged sequentially from the inside out. The first valve body, the second valve body, and the third valve body are all hollow tube structures with openings at both ends. The first valve body and the second valve body are both installed on the same side of the third valve body. A valve stem is installed in the first valve body, and one side of the first valve body is sealed by a lock nut. The other side of the third valve body is an inlet and outlet port, which is the first inlet and outlet port, thereby forming a one-way flow channel in the combined valve body. A one-way valve is also provided at the first inlet and outlet port. Another inlet and outlet port connected to the flow channel is also opened on the outer wall of the third valve body, which is the second inlet and outlet port. The lock nut extends into the first valve body, and a groove for the valve stem to extend into is opened on one side of the lock nut. A throttling valve is also provided on the side of the valve stem away from the lock nut. When the hydraulic cylinder retracts, the one-way valve closes, and the oil flows from the first inlet / outlet to the second inlet / outlet after passing through the throttle valve, thus achieving the slow retraction of the hydraulic cylinder. When the cylinder extends, the oil does not pass through the throttle valve, but flows directly from the second inlet / outlet to the first inlet / outlet through the check valve, thus achieving rapid extension of the cylinder.

3. The hydrostatic support cylinder with a buffer mechanism according to claim 1, characterized in that: The horizontal length of the buffer is less than the horizontal length of the piston.

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