Hydraulic cylinder bumper

Abstract

The application provides a hydraulic cylinder buffer, which comprises a cylinder barrel, a piston and a cylinder cover, a buffer assembly is arranged between the piston, the cylinder barrel and the cylinder cover, the buffer assembly and the cylinder barrel and the cylinder cover form a first cavity, a throttling cavity is arranged on the cylinder cover, the throttling cavity is communicated with the first cavity, a second cavity is formed in the buffer assembly, the buffer assembly is provided with a flow guide groove, and the first cavity and the second cavity are communicated through the flow guide groove. By arranging the buffer assembly between the cylinder cover and the piston, liquid oil enters the buffer assembly, direct contact with the piston is avoided, and the service life and stability of the equipment are improved. In addition, the liquid oil flows in the throttling cavity, the first cavity and the second cavity, and the buffer assembly serves as a primary buffering action, namely, the application adopts double buffering actions, effectively reduces the impact and vibration of the hydraulic cylinder during the working process, and improves the stability and service life of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic buffer structure, in particular to a hydraulic cylinder buffer. BACKGROUND

[0002] When the hydraulic cylinder moves at high speed with heavy components to the end of the stroke, violent mechanical impact often occurs. In addition, the hydraulic pipeline water hammer phenomenon often occurs due to the sudden stop of the piston movement, thereby generating a great impact and noise. Such mechanical impact not only affects the working performance of the mechanical equipment, but also damages the hydraulic cylinder and other elements of the hydraulic system, which is very harmful. The buffer is a device arranged in the hydraulic cylinder to prevent or reduce such impact, which can play a buffering protection role to a certain extent.

[0003] The prior art usually uses the piston or the cylinder to block part of the oil between the piston and the cylinder cover when moving to the end of the stroke, forcing it to squeeze out from the small hole or gap to generate a large resistance, so that the working component is braked and the movement speed is gradually slowed down, thereby avoiding the mutual impact of the piston and the cylinder cover. In the prior art, the buffer effect can only be achieved by the flow of oil from the gap between the piston and the cylinder cover. Once the oil leaks, the buffer effect may be reduced. Moreover, when the working load of the hydraulic cylinder is large or the movement speed is fast, the resistance generated by the oil through the small hole or gap is not enough to completely offset the impact and vibration, which leads to the inability to effectively reduce the impact and vibration of the hydraulic cylinder during the working process. SUMMARY

[0004] Therefore, the present application aims to provide a hydraulic cylinder buffer to solve the problem that the buffer effect may be reduced once the oil leaks in the prior art, and the resistance generated by the oil through the small hole or gap is not enough to completely offset the impact and vibration when the working load of the hydraulic cylinder is large or the movement speed is fast, which leads to the inability to effectively reduce the impact and vibration of the hydraulic cylinder during the working process.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A hydraulic cylinder buffer, comprising a cylinder cover, a cylinder barrel and a piston, wherein a buffer is arranged between the piston, the hydraulic cylinder and the cylinder cover, a first cavity is formed between the buffer assembly and the cylinder cover and the cylinder barrel, a throttling cavity is arranged on the cylinder cover and communicates with the first cavity, a second cavity is formed in the buffer assembly, the buffer assembly is provided with a flow guide groove, and the first cavity and the second cavity communicate through the flow guide groove.

[0007] The setting avoids direct contact of the liquid oil with the piston by arranging the buffer assembly between the cylinder cover and the piston, improves the service life and stability of the equipment, and in addition, the liquid oil flows in the throttle chamber, the first cavity and the second cavity, as a first buffering action, the buffer assembly is as a first buffering action, that is, the double buffering action is adopted, effectively reduces the impact and vibration of the hydraulic cylinder in the working process, and improves the stability and service life of the equipment.

[0008] Further, the buffer assembly comprises a shell, a gland, a pressure head and an elastic piece, the shell is in close contact with the cylinder barrel, the shell is connected with the gland, the pressure head is in sliding connection with the gland, the second cavity is formed between the pressure head, the gland and the shell, and the elastic piece is located in the second cavity.

[0009] Further, the flow guide groove is arranged on the pressure head.

[0010] Further, the shell is provided with an internal thread, the gland is provided with an external thread, and the shell and the gland are connected through the threads.

[0011] The setting not only makes the connection of the buffer assembly more stable, but also simplifies the installation structure.

[0012] Further, the shell is provided with a first groove, the pressure head is provided with a second groove, and the end of the elastic piece is located in the first groove and the second groove.

[0013] Further, the depth of the second groove is greater than that of the first groove.

[0014] Further, the elastic piece is a spring.

[0015] Further, the buffer assembly is provided with a sealing piece, and the sealing piece is in close contact with the cylinder barrel.

[0016] The setting avoids the influence of the gravity load on the sealing structure on the piston by arranging the sealing piece on the buffer assembly, improves the uniformity of wear and service life of the sealing piece.

[0017] Further, the end of the buffer assembly in contact with the cylinder cover is a spherical surface, and the end of the cylinder cover in contact with the buffer assembly is a flat surface.

[0018] Further, the end of the piston in contact with the buffer assembly is a spherical surface, and the end of the buffer assembly 3 in contact with the piston is a flat surface.

[0019] In the setting, the contact ends of the piston and the buffer assembly and the buffer assembly and the cylinder cover adopt the design of spherical surface and flat surface, reduce the manufacturing precision and the influence of eccentric load, and make the load conditions of the piston, the buffer assembly, the cylinder cover and other parts better.

[0020] Compared with the prior art, the hydraulic cylinder buffer has the following advantages:

[0021] (1) The buffer assembly is arranged between the cylinder cover and the piston, liquid oil enters the buffer assembly, avoids direct contact with the piston, improves the service life and stability of the equipment, and the liquid oil flows in the throttle cavity, the first cavity and the second cavity, as a first buffering action, the buffer assembly is as a first buffering action, that is, the present application adopts double buffering action, effectively reduces the impact and vibration of the hydraulic cylinder in the working process, and improves the stability and service life of the equipment;

[0022] (2) The elastic member is located in the second cavity, when subjected to external impact force or pressure, the elastic member can absorb and disperse these forces, thereby protecting the connected parts from damage or reducing the damage degree; the sliding connection between the pressure head and the pressure cover allows certain relative movement, so that the pressure head can adaptively move according to the change of external pressure, thereby more effectively absorbing and dispersing the impact. In addition, by adjusting the relative position between the pressure head and the pressure cover, the compression degree of the elastic member is changed, thereby affecting the size of the buffer force. In addition, the shell, the pressure cover, the pressure head, the elastic member and the sealing member are integrated in a compact assembly, which not only simplifies the overall structure of the system, but also improves its maintainability and reliability. This design makes installation, replacement and maintenance easier, while also reducing the complexity and cost of the system;

[0023] (3) The present application adopts spherical and planar design for the contact end of the piston with the buffer assembly and the buffer assembly with the cylinder cover, which reduces the manufacturing precision and eccentric load influence, so that the piston, buffer assembly, cylinder cover and other parts are better under load conditions;

[0024] (4) The buffer assembly of the present application adopts independent buffer structure design, has the characteristics of reliable sealing, adjustable resistance value, excellent buffering effect, etc., can effectively reduce the impact load and noise of the hydraulic cylinder, and prolong the service life of the hydraulic cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural schematic view of the hydraulic cylinder buffer of the present application;

[0026] Fig. 2 is a structural schematic view of the buffer of the present application.

[0027] REFERENCE SIGNS:

[0028] 1-cylinder, 2-piston, 201-vent, 3-buffer assembly, 301-housing, 3011-first groove, 3012-small hole, 302-seal, 303-pressing cap, 304-elastic member, 305-pressing head, 3051-second groove, 306-flow guide groove, 4-cylinder cover, 401-throttle chamber, 5-throttle valve, 6-first cavity, 7-second cavity. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] As shown in Figs. 1-2 The present application relates to a hydraulic cylinder buffer, which can be placed horizontally or vertically, comprising a cylinder 1, a piston 2 and a cylinder cover 4, a buffer assembly 3 is arranged between the cylinder 1, the piston 2 and the cylinder cover 4, the buffer assembly 3 and the cylinder 1, the cylinder cover 4 form a first cavity 6, the cylinder cover 4 is provided with a throttle chamber 401, the throttle chamber 401 communicates with the first cavity 6, the buffer assembly 3 forms a second cavity 7, the buffer assembly 3 is provided with a flow guide groove 306, the first cavity 6 and the second cavity 7 are communicated through the flow guide groove 306.

[0031] In this embodiment, by arranging a buffer assembly between the cylinder cover and the piston, the hydraulic oil enters the inside of the buffer assembly, avoiding direct contact with the piston, improving the service life and stability of the equipment, in addition, the hydraulic oil flows in the throttle chamber, the first cavity and the second cavity, as a first buffering action, the buffer assembly as a first buffering action, that is, the present application adopts double buffering action, effectively reduces the impact and vibration of the hydraulic cylinder in the working process, improves the stability and service life of the equipment.

[0032] Specifically, the cylinder cover 4 is provided with a throttle valve 5, the throttle valve 5 is connected with the throttle chamber 401, which is convenient for controlling the flow of oil in the throttle chamber.

[0033] Specifically, the buffer assembly 3 is provided with a seal 302, which is in close contact with the cylinder 1.

[0034] In this embodiment, by arranging a seal on the buffer assembly, the influence of gravity load on the sealing structure on the piston is avoided, and the uniformity of wear and service life of the seal is improved.

[0035] More specifically, the buffer assembly is provided with an annular groove, and the sealing member is a rubber ring located in the groove. The rubber ring is correspondingly arranged in the groove, and a plurality of rubber rings are preferably provided, and two rubber rings are preferably provided. Two sealing channels in this arrangement can reduce the risk of hydraulic cylinder leakage.

[0036] Specifically, the end of the piston 2 in contact with the buffer assembly 3 is a spherical surface, and the end of the buffer assembly 3 in contact with the piston is a flat surface.

[0037] Specifically, the end of the buffer assembly 3 in contact with the cylinder cover 4 is a spherical surface, and the end of the cylinder cover 4 in contact with the buffer assembly 3 is a flat surface.

[0038] In this embodiment, the end of the piston in contact with the buffer assembly and the end of the buffer assembly in contact with the cylinder cover are designed with a spherical surface and a flat surface, which reduces the manufacturing precision and the influence of eccentric load, and makes the load conditions of the piston, the buffer assembly, the cylinder cover and other parts better.

[0039] Specifically, the buffer assembly 3 includes a housing 301, a gland 303, a pressure head 305, and an elastic member 304. The sealing member 302 is arranged on the housing 301, the housing 301 is in close contact with the cylinder barrel 1, the housing 301 is connected with the gland 303, the pressure head 305 is in sliding connection with the gland 303, a second cavity 7 is formed between the pressure head 305, the gland 303 and the housing 301, and the elastic member 304 is located in the second cavity 7. One end of the elastic member is in contact with the housing, and the other end is in contact with the pressure head.

[0040] In this embodiment, when subjected to external impact force or pressure, the elastic member located in the second cavity can absorb and disperse these forces, thereby protecting the connected parts from damage or reducing the damage process. The resistance size can be adjusted by adjusting the parameters of the elastic member. The sliding connection between the pressure head and the gland allows a certain relative movement, so that the pressure head can adaptively move according to the change of external pressure, thereby more effectively absorbing and dispersing the impact. In addition, by adjusting the relative position between the pressure head and the gland to change the compression degree of the elastic member, the size of the buffer force is affected. In addition, the housing, the gland, the pressure head, the elastic member and the sealing member are integrated in a compact assembly, which not only simplifies the overall structure of the system, but also improves its maintainability and reliability. This design makes installation, replacement and maintenance easier, while also reducing the complexity and cost of the system.

[0041] Specifically, the flow guide groove 306 is arranged on the pressure head. The outer contour of the pressure head is a stepped structure, and the flow guide groove 306 is preferably arranged along the outer contour of the pressure head. A plurality of flow guide grooves can be provided, and two flow guide grooves are preferably provided, which are symmetrically arranged about the axial line of the pressure head.

[0042] In the embodiment, the flow guide groove has a stepped structure, and the oil in the oil cavity can enter and exit through the flow guide groove, and the oil flow resistance is made larger through reasonable structure design of the flow guide groove, so that the impact and vibration of the hydraulic cylinder during operation are effectively reduced, and the stability and service life of the equipment are improved.

[0043] Specifically, the shell 301 is provided with an internal thread, and the gland 303 is provided with an external thread, and the shell 301 and the gland 303 are connected through the threads.

[0044] In the embodiment, the arrangement not only makes the connection of the buffer assembly more stable, but also simplifies the mounting structure.

[0045] Specifically, the shell 301 is provided with a first groove 3011, the pressing head 305 is provided with a second groove 3051, and the end of the elastic member 304 is located in the first groove 3011 and the second groove 3051.

[0046] Specifically, the depth of the second groove 3051 is greater than the depth of the first groove 3011.

[0047] In the embodiment, the arrangement improves the stability of the elastic member and effectively buffers.

[0048] Specifically, the elastic member 304 is a spring.

[0049] Specifically, the piston 2 is provided with the same vent groove 201.

[0050] In the embodiment, the arrangement of the vent groove avoids the formation of a piston effect between the piston and the cylinder barrel.

[0051] Specifically, the shell is provided with a small hole 3012, which facilitates the mounting of the shell 301 on the cylinder barrel 1.

[0052] The hydraulic cylinder buffer in the embodiment is particularly suitable for large-specification hydraulic cylinders and has high application value; the working principle is that the buffer assembly is built-in in the cylinder barrel, and the left and right ends are in contact with the cylinder cover and the piston, respectively; during operation, the oil at one end (the high-pressure side) flows into the throttle chamber and the first cavity in sequence through the throttle valve, pushes the (high-pressure side) buffer assembly to move linearly, and the high-pressure side buffer assembly drives the piston and the buffer assembly at the other end (the low-pressure side) to move linearly in sequence. The high-pressure side buffer assembly plays a buffering role when starting, and the low-pressure side buffer assembly plays a buffering role when stopping. Conversely, the same is true.

[0053] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A hydraulic cylinder buffer, characterized in that, The system includes a cylinder (1), a piston (2), and a cylinder head (4). A buffer assembly (3) is provided between the piston (2), cylinder (1), and cylinder head (4). A first cavity (6) is formed between the buffer assembly (3), the cylinder (1), and the cylinder head (4). A throttling cavity (401) is provided on the cylinder head (4), and the throttling cavity (401) is connected to the first cavity (6). A second cavity (7) is formed inside the buffer assembly (3). A guide groove (306) is provided on the buffer assembly (3). The first cavity (6) and the second cavity (7) are connected through the guide groove (306). The buffer assembly (3) includes a housing (301), a pressure cap (303), a pressure head (305), and an elastic element (304). The housing (301) is in close contact with the cylinder (1). The housing (301) is connected to the pressure cap (303). The pressure head (305) is connected to the pressure cap (304). The cover (303) is slidably connected, and a second cavity (7) is formed between the pressure head (305), the pressure cover (303), and the housing (301). The elastic element (304) is located in the second cavity (7). The outer contour of the pressure head (305) is a stepped structure, and the guide groove (306) is set along the outer contour of the pressure head (305). The housing (301) is provided with a first groove (3011), and the pressure head (305) is provided with a second groove (3051). The end of the elastic element (304) is located in the first groove (3011) and the second groove (3051). The end of the piston (2) that contacts the buffer assembly (3) is spherical, and the end of the buffer assembly (3) that contacts the piston (2) is flat. The end of the buffer assembly (3) that contacts the cylinder head (4) is spherical, and the end of the cylinder head (4) that contacts the buffer assembly (3) is flat.

2. A hydraulic cylinder buffer according to claim 1, characterized in that, The flow guide groove (306) is disposed on the pressure head (305).

3. A hydraulic cylinder buffer according to claim 1, characterized in that, The housing (301) is provided with an internal thread, and the pressure cap (303) is provided with an external thread. The housing (301) and the pressure cap (303) are connected by threads.

4. A hydraulic cylinder buffer according to claim 1, characterized in that, The depth of the second groove (3051) is greater than the depth of the first groove (3011).

5. A hydraulic cylinder buffer according to claim 1, characterized in that, The elastic element (304) is a spring.

6. A hydraulic cylinder buffer according to claim 1, characterized in that, The buffer assembly (3) is provided with a seal (302), which is in close contact with the cylinder (1).

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