Hydraulic cylinder buffer

Abstract

The invention provides a hydraulic cylinder buffer which comprises a cylinder barrel, a piston and a cylinder cover, a buffer assembly is arranged among the piston, the cylinder barrel and the cylinder cover, a first cavity is formed among the buffer assembly, the cylinder barrel and the cylinder cover, a throttling cavity is formed in the cylinder cover, the throttling cavity is communicated with the first cavity, a second cavity is formed in the buffer assembly, and the first cavity is communicated with the second cavity. 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. The buffering assembly is arranged between the cylinder cover and the piston, liquid oil enters the buffering assembly and is prevented from making direct contact with the piston, the service life of equipment is prolonged, the stability of the equipment is improved, in addition, the liquid oil flows in the throttling cavity, the first cavity and the second cavity and serves as a primary buffering effect, the buffering assembly serves as a primary buffering effect, and the service life of the equipment is prolonged. The double buffering effect is adopted, impact and vibration of the hydraulic cylinder in the working process are effectively reduced, the stability of equipment is improved, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic buffer device structures, and in particular to a hydraulic cylinder buffer. Background Art

[0002] When the hydraulic cylinder moves at high speed with heavy parts to the end of the stroke, violent mechanical collision often occurs. In addition, the sudden stop of the piston often causes water hammer in the hydraulic pipeline, which produces great impact and noise. This mechanical impact not only affects the working performance of mechanical equipment, but also damages the hydraulic cylinder and other components of the hydraulic system, which is very harmful. The buffer is a device set in the hydraulic cylinder to prevent or reduce this impact, which can play a buffering and protective role to a certain extent.

[0003] The prior art usually uses the piston or cylinder to seal part of the oil between the piston and the cylinder head when it moves 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 parts are braked and the movement speed is gradually slowed down to avoid the collision between the piston and the cylinder head. In the prior art, the buffering effect can only be achieved by the oil flowing through the gap between the piston and the cylinder head. Once the oil leaks, the buffering effect may be reduced. Moreover, when the hydraulic cylinder has a large workload or a fast movement speed, the resistance generated by the oil passing through the small hole or gap is not enough to completely offset the impact and vibration, resulting in the inability to effectively reduce the impact and vibration of the hydraulic cylinder during operation. Summary of the invention

[0004] In view of this, the present invention aims to propose a hydraulic cylinder buffer to solve the problem that the buffering effect can only be achieved by the flow of oil through the gap between the piston and the cylinder head in the prior art, and once the oil leaks, the buffering effect may be reduced, and when the hydraulic cylinder has a large workload or a fast movement speed, the resistance generated by the oil passing through the small holes or gaps is not enough to completely offset the impact and vibration, resulting in the inability to effectively reduce the impact and vibration of the hydraulic cylinder during operation.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A hydraulic cylinder buffer comprises a cylinder head, a cylinder barrel and a piston, wherein a buffer is arranged between the piston, the hydraulic cylinder and the cylinder head, a first cavity is formed between the buffer assembly and the cylinder head and the cylinder barrel, a throttling cavity is arranged on the cylinder head, and the throttling cavity is communicated with the first cavity, a second cavity is formed in the buffer assembly, and the buffer assembly is provided with a guide groove, and the first cavity and the second cavity are communicated through the guide groove.

[0007] The arrangement arranges a buffer assembly between the cylinder cover and the piston, and the liquid oil enters the interior of the buffer assembly to avoid direct contact with the piston, thereby improving the service life and stability of the equipment. In addition, the liquid oil flows in the throttling chamber, the first cavity, and the second cavity as a primary buffer, and the buffer assembly serves as a primary buffer, that is, the present invention adopts a double buffering effect, which effectively reduces the impact and vibration of the hydraulic cylinder during operation and improves the stability and service life of the equipment.

[0008] Furthermore, the buffer assembly includes a shell, a pressure cover, a pressure head, and an elastic member. The shell is in close contact with the cylinder barrel, the shell is connected to the pressure cover, the pressure head is slidably connected to the pressure cover, a second cavity is formed between the pressure head, the pressure cover, and the shell, and the elastic member is located in the second cavity.

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

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

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

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

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

[0014] Furthermore, the elastic member is a spring.

[0015] Furthermore, a sealing member is provided on the buffer assembly, and the sealing member is in close contact with the cylinder barrel.

[0016] This arrangement avoids the influence of gravity load on the sealing structure on the piston by arranging a sealing member on the buffer assembly, thereby improving the wear uniformity and service life of the sealing member.

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

[0018] Furthermore, one end of the piston that contacts the buffer component is a spherical surface, and one end of the buffer component 3 that contacts the piston is a flat surface.

[0019] In this arrangement, the contact end between the piston and the buffer assembly, as well as the buffer assembly and the cylinder head adopt a spherical and flat design, which reduces the manufacturing accuracy and the influence of eccentric loads, and improves the loading conditions of parts such as the piston, the buffer assembly, and the cylinder head.

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

[0021] (1) The present invention sets a buffer assembly between the cylinder cover and the piston, and the liquid oil enters the buffer assembly to avoid direct contact with the piston, thereby improving the service life and stability of the equipment. In addition, the liquid oil flows in the throttling chamber, the first cavity, and the second cavity, which acts as a primary buffer. The buffer assembly acts as a primary buffer, that is, the present invention adopts a double buffering effect, which effectively reduces the impact and vibration of the hydraulic cylinder during operation, thereby improving the stability and service life of the equipment;

[0022] (2) The present invention locates the elastic member in the second cavity. When subjected to external impact force or pressure, the elastic member can absorb and disperse these forces, thereby protecting the components connected thereto from damage or reducing the degree of damage. The sliding connection between the pressure head and the pressure cover allows a certain relative movement, so that the pressure head can move adaptively according to the change in external pressure, thereby more effectively absorbing and dispersing the impact. In addition, the compression degree of the elastic member is changed by adjusting the relative position between the pressure head and the pressure cover, thereby affecting the magnitude of the buffering force. In addition, the shell, pressure cover, pressure head, elastic member and seal are integrated into a compact assembly. The buffer assembly 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 invention adopts spherical and flat designs for the contact ends of the piston and the buffer assembly, and for the buffer assembly and the cylinder head, to reduce the manufacturing precision and the influence of the eccentric load, so that the loading conditions of the piston, the buffer assembly, the cylinder head and other parts are better;

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

[0025] Figure 1 It is a structural schematic diagram of the hydraulic cylinder buffer of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the buffer of the present invention.

[0027] Description of reference numerals:

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

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0030] like Figures 1-2 As shown, the present invention relates to a hydraulic cylinder buffer, which can be placed horizontally or vertically, and includes a cylinder barrel 1, a piston 2, and a cylinder head 4. A buffer component 3 is arranged between the cylinder barrel 1, the piston 2, and the cylinder head 4. A first cavity 6 is formed between the buffer component 3 and the cylinder barrel 1 and the cylinder head 4. A throttling cavity 401 is arranged on the cylinder head 4, and the throttling cavity 401 is communicated with the first cavity 6. A second cavity 7 is formed in the buffer component 3, and the buffer component 3 is provided with a guide groove 306. The first cavity 6 and the second cavity 7 are communicated through the guide groove 306.

[0031] In this embodiment, a buffer assembly is provided between the cylinder cover and the piston, and the liquid oil enters the interior of the buffer assembly to avoid direct contact with the piston, thereby improving the service life and stability of the equipment. In addition, the liquid oil flows in the throttling chamber, the first cavity, and the second cavity as a primary buffer, and the buffer assembly serves as a primary buffer. That is, the present invention adopts a double buffering effect, which effectively reduces the impact and vibration of the hydraulic cylinder during operation and improves the stability and service life of the equipment.

[0032] Specifically, a throttle valve 5 is provided on the cylinder head 4, and the throttle valve 5 is connected to the throttle chamber 401 to facilitate controlling the flow of oil in the throttle chamber.

[0033] Specifically, a seal 302 is provided on the buffer assembly 3 , and the seal 302 is in close contact with the cylinder barrel 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 wear uniformity and service life of the seal are improved.

[0035] More specifically, the buffer assembly is provided with an annular groove, the sealing member is a rubber ring, the rubber ring is located in the groove, the rubber ring is arranged corresponding to the groove, a plurality of rubber rings are provided, preferably two rubber rings are provided. In this arrangement, two seals can reduce the risk of internal leakage of the hydraulic cylinder.

[0036] Specifically, one end of the piston 2 that contacts the buffer assembly 3 is a spherical surface, and one end of the buffer assembly 3 that contacts the piston is a flat surface.

[0037] Specifically, one end of the buffer component 3 that contacts the cylinder head 4 is a spherical surface, and one end of the cylinder head 4 that contacts the buffer component 3 is a flat surface.

[0038] In this embodiment, the contact end of the piston and the buffer assembly, as well as the buffer assembly and the cylinder head adopt a spherical and flat design to reduce manufacturing accuracy and the influence of eccentric loads, so that the loading conditions of parts such as the piston, buffer assembly, and cylinder head are better.

[0039] Specifically, the buffer assembly 3 includes a shell 301, a pressure cover 303, a pressure head 305, and an elastic member 304. The sealing member 302 is arranged on the shell 301. The shell 301 is in close contact with the cylinder 1. The shell 301 is connected to the pressure cover 303. The pressure head 305 is slidably connected to the pressure cover 303. A second cavity 7 is formed between the pressure head 305, the pressure cover 303, and the shell 301. The elastic member 304 is located in the second cavity 7, and one end of the elastic member is in contact with the shell, and the other end is in contact with the pressure head.

[0040] In this embodiment, 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 components connected thereto from damage or reducing the damage process, and the resistance size can be adjusted by adjusting the elastic member parameters; the sliding connection between the pressure head and the pressure cover allows a certain relative movement, so that the pressure head can be adaptively moved according to the change of external pressure, thereby more effectively absorbing and dispersing the impact. In addition, the compression degree of the elastic member is changed by adjusting the relative position between the pressure head and the pressure cover, thereby affecting the size of the buffering force. In addition, the housing, pressure cover, pressure head, elastic member and seal 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 guide groove 306 is arranged on the pressure head. The outer contour of the pressure head is a step structure. Preferably, the guide groove 306 is arranged along the outer contour of the pressure head. Multiple guide grooves can be arranged. Preferably, two guide grooves are arranged symmetrically about the axial line of the pressure head.

[0042] In this embodiment, the guide groove has a step structure, and the oil in the oil chamber can enter and discharge through the guide groove. Through the reasonable structural design of the guide groove, the oil flow resistance is increased, which effectively reduces the impact and vibration of the hydraulic cylinder during operation, and improves the stability and service life of the equipment.

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

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

[0045] Specifically, the housing 301 is provided with a first groove 3011 , the pressing head 305 is provided with a second groove 3051 , and the ends of the elastic member 304 are 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 this embodiment, this arrangement improves the stability of the elastic member and effectively performs buffering.

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

[0049] Specifically, a ventilation groove 201 is provided on the piston 2 .

[0050] In this embodiment, the ventilation groove is provided to prevent the piston and the cylinder from forming a piston effect.

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

[0052] The hydraulic cylinder buffer in this embodiment is particularly suitable for large-size hydraulic cylinders and has high application value. Its working principle is as follows: the buffer component is built into the cylinder barrel, and the left and right ends are in contact with the cylinder head and the piston respectively. When working, the oil at one end (high-pressure side) flows into the throttling chamber and the first chamber in turn through the throttle valve, pushing the (high-pressure side) buffer component to move linearly, and the high-pressure side buffer component drives the piston and the buffer component at the other end (low-pressure side) to move linearly in turn. The high-pressure side buffer component plays a buffering role when starting, and the low-pressure side buffer component plays a buffering role when stopping. Vice versa.

[0053] Although the present invention is disclosed as above, the present invention 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 invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A hydraulic cylinder buffer, characterized in that: The invention comprises a cylinder (1), a piston (2) and a cylinder head (4); a buffer assembly (3) is arranged between the piston (2), the cylinder (1) and the 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 arranged on the cylinder head (4); the throttling cavity (401) is communicated with the first cavity (6); a second cavity (7) is formed in the buffer assembly (3); the buffer assembly (3) is provided with a guide groove (306); the first cavity (6) and the second cavity (7) are communicated through the guide groove (306).

2. A hydraulic cylinder buffer according to claim 1, characterized in that: The buffer assembly (3) comprises a shell (301), a pressure cover (303), a pressure head (305), and an elastic member (304); the shell (301) is in close contact with the cylinder barrel (1); the shell (301) is connected to the pressure cover (303); the pressure head (305) is slidably connected to the pressure cover (303); a second cavity (7) is formed between the pressure head (305), the pressure cover (303), and the shell (301); and the elastic member (304) is located in the second cavity (7).

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

4. A hydraulic cylinder buffer according to claim 2, characterized in that: The housing (301) is provided with an internal thread, the gland (303) is provided with an external thread, and the housing (301) and the gland (303) are connected via threads.

5. A hydraulic cylinder buffer according to claim 2, characterized in that: The housing (301) is provided with a first groove (3011), the pressure 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).

6. A hydraulic cylinder buffer according to claim 5, characterized in that: The depth of the second groove (3051) is greater than the depth of the first groove (3011).

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

8. The hydraulic cylinder buffer according to claim 1, characterized in that: The buffer assembly (3) is provided with a sealing member (302), and the sealing member (302) is in close contact with the cylinder barrel (1).

9. The hydraulic cylinder buffer according to claim 1, characterized in that: The end of the piston (2) that contacts the buffer component (3) is a spherical surface, and the end of the buffer component (3) that contacts the piston (2) is a flat surface.

10. The hydraulic cylinder buffer according to claim 1, characterized in that: One end of the buffer component (3) that contacts the cylinder head (4) is a spherical surface, and one end of the cylinder head (4) that contacts the buffer component (3) is a flat surface.

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