阅读说明：本技术 一种微调型自动补偿式缓冲器 (Fine adjustment type automatic compensation type buffer ) 是由 王东东 于 2021-10-12 设计创作，主要内容包括：本申请提供了一种微调型自动补偿式缓冲器,包括活塞杆、缓冲腔和蓄压腔,所述缓冲腔与所述蓄压腔连通,所述活塞杆的一端伸入所述缓冲腔内,所述活塞杆在受到撞击时将所述缓冲腔内的液压油推入所述蓄压腔中,所述活塞杆内开设有连通所述缓冲腔和蓄压腔的补偿通道,所述补偿通道内设置有补偿组件,所述补偿组件被配置为能够根据所述缓冲腔内的压力调节所述补偿通道的开闭。本申请通过设置补偿组件,能够在外界条件发生变化时,自动打开缓冲腔与蓄压腔之间的补偿通道,实现自动补偿功能。通过将补充组件和补充通道设置于活塞杆内,能够减少对原有缓冲器结构的改动,并减小整体体积。(The application provides a fine setting type automatic compensation formula buffer, including piston rod, cushion chamber and pressure accumulation chamber, the cushion chamber with pressure accumulation chamber intercommunication, the one end of piston rod stretches into in the cushion chamber, the piston rod will when receiving the striking hydraulic oil in the cushion chamber pushes in the pressure accumulation chamber, set up the intercommunication in the piston rod the compensation passageway in cushion chamber and pressure accumulation chamber, be provided with compensation assembly in the compensation passageway, compensation assembly is configured to can be according to pressure regulation in the cushion chamber the switching of compensation passageway. This application can be when external condition changes, and the automatic compensation function is realized to the compensation passageway between automatic opening cushion chamber and the pressure accumulation chamber through setting up compensation assembly. Through set up supplementary subassembly and supplementary passageway in the piston rod, can reduce the change to original buffer structure to reduce whole volume.)

1. The utility model provides a fine setting type automatic compensation formula buffer, includes piston rod, cushion chamber and pressure accumulation chamber, the cushion chamber with pressure accumulation chamber intercommunication, the one end of piston rod stretches into in the cushion chamber, the piston rod will when receiving the striking hydraulic oil in the cushion chamber pushes in the pressure accumulation chamber, a serial communication port, set up the intercommunication in the piston rod the compensation passageway in cushion chamber and pressure accumulation chamber, be provided with compensation assembly in the compensation passageway, compensation assembly is configured to can be according to pressure regulation in the cushion chamber the switching of compensation passageway.

2. The trimming type self-compensating buffer of claim 1, wherein: the compensation subassembly includes moving part and pretension piece, the moving part set up in the compensation passageway, the pretension piece set up in the moving part is kept away from one side of cushion chamber, the pretension piece give the moving part provides the pretightning force.

3. The trimming type automatic compensation buffer according to claim 2, wherein: the preload pieces are disc spring groups.

4. The trimming type automatic compensation buffer according to claim 2, wherein: an adjusting ejector rod is arranged in the piston rod, one end of the adjusting ejector rod is abutted to the pre-tightening piece, the other end of the adjusting ejector rod is connected with an adjusting knob, and the adjusting knob is arranged at the end of the piston rod.

5. The trimming type automatic compensation buffer according to claim 2, wherein: the piston rod stretches into one of buffer chamber is served and is connected with the piston, set up piston oil drain hole on the tip lateral wall of buffer chamber.

6. The trimming type automatic compensation buffer according to claim 5, wherein: the compensation channel comprises an axial hole formed along the axial direction of the piston rod and a lateral hole formed in the side wall of the piston rod, and the lateral hole is formed in the rear of the piston.

7. The trimming type automatic compensation buffer according to claim 5, wherein: the buffer cavity is internally provided with a return spring, the piston is embedded with a spring guide pillar, and the axle center of the spring guide pillar is provided with a through hole.

8. The trimming type self-compensating buffer according to claim 7, wherein: a first sealing ring is arranged between the spring guide post and the piston.

9. The trimming type self-compensating buffer according to claim 7, wherein: the movable piece is a cone valve, the cone valve comprises a cone end, the cone end is inserted into the through hole, and the cone valve further comprises a contact surface, and the contact surface abuts against the pre-tightening piece.

10. The trimming type self-compensating buffer of claim 9, wherein: an annular groove is formed in the outer peripheral side of the conical valve, and a second sealing ring is arranged in the annular groove.

Technical Field

The invention relates to a buffer technology, in particular to a fine adjustment type automatic compensation buffer.

Background

The hydraulic buffer is divided into an adjustable type and a fixed type, the adjustable type is provided with a rotary knob, and the size of the sectional area of the discharged oil can be changed when the rotary knob is rotated, so that the buffering effect is changed. The fixed type does not have an adjusting knob, the oil discharge sectional areas of the internal oil discharge hole and the piston and the inner cylinder are fixed, and three effects are usually made for customers to select, for example, effect 1 corresponds to high speed, effect 2 corresponds to medium speed, and effect 3 corresponds to low speed. When the condition of a client is changed into high-speed collision, the currently used medium-speed or low-speed buffer rebounds after the stroke is incomplete, and the buffering effect is poor, because the displacement of the medium-speed or low-speed oil discharge hole is smaller than that of the high-speed buffer, when the speed is higher, the internal hydraulic oil cannot be discharged in time, the internal pressure suddenly rises, and the rebound is caused. If the adjustable oil buffer is selected to bounce when the stroke is not finished, the adjusting knob needs to be adjusted down, so that the area of the adjusted oil groove is increased. No matter the customer selects the fixed type or the adjustable type, when the external condition changes, the fixed type needs to be reselected, and the adjustable type needs to be readjusted, so that the automatic compensation adjustment cannot be realized.

In order to realize automatic compensation, the prior patent CN201721567301.8 of the applicant proposes an oil pressure buffer chamber, which is designed with a two-stage buffer assembly, wherein the two-stage buffer assembly can realize automatic overflow compensation effect, but the compensation structure occupies part of the original buffer chamber, and in order to ensure enough space of the buffer chamber, the whole buffer needs to be made longer or larger. In addition, this compensation structure needs to carry out structural adjustment to original inner casing, and the transformation cost is higher.

Disclosure of Invention

The invention aims to provide a fine adjustment type automatic compensation type buffer, which does not need to be adjusted or reselected when external conditions change within a certain range, and can automatically change an oil discharge section so as to improve the buffer effect.

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to one aspect of the invention, a fine-tuning type automatic compensation type buffer is provided, and the buffer comprises a piston rod, a buffer cavity and a pressure accumulation cavity, wherein the buffer cavity is communicated with the pressure accumulation cavity, one end of the piston rod extends into the buffer cavity, the piston rod pushes hydraulic oil in the buffer cavity into the pressure accumulation cavity when being impacted, a compensation channel communicated with the buffer cavity and the pressure accumulation cavity is formed in the piston rod, a compensation assembly is arranged in the compensation channel, and the compensation assembly is configured to be capable of adjusting the compensation channel to be opened or closed according to pressure in the buffer cavity.

In an embodiment, the compensation assembly comprises a movable member and a preload member, the movable member is disposed in the compensation channel, the preload member is disposed on a side of the movable member away from the buffer cavity, and the preload member provides a preload force to the movable member.

In one embodiment, the preload member is a disc spring pack.

In one embodiment, an adjusting ejector rod is arranged in the piston rod, one end of the adjusting ejector rod is abutted to the pre-tightening piece, the other end of the adjusting ejector rod is connected with an adjusting knob, and the adjusting knob is arranged at the end part of the piston rod.

In one embodiment, one end of the piston rod, which extends into the buffer cavity, is connected with a piston, and a piston oil discharge hole is formed in the side wall of the end part of the buffer cavity.

In one embodiment, the compensation passage includes an axial hole formed along the axial direction of the piston rod and a lateral hole formed in the side wall of the piston rod, and the lateral hole is formed behind the piston.

In one embodiment, a return spring is disposed in the buffer cavity, a spring guide post is embedded in the piston, and a through hole is formed in the axis of the spring guide post.

In one embodiment, a first sealing ring is arranged between the spring guide post and the piston.

In one embodiment, the movable member is a cone valve, the cone valve includes a tapered end, the tapered end is inserted into the through hole, and the cone valve further includes a contact surface, and the contact surface abuts against the preload member.

In one embodiment, an annular groove is formed on the outer peripheral side of the conical valve, and a second sealing ring is arranged in the annular groove.

The embodiment of the invention has the beneficial effects that: through setting up compensation assembly, can open the compensation passageway between cushion chamber and the pressure accumulation chamber automatically when external conditions changes, realize the automatic compensation function. Through set up supplementary subassembly and supplementary passageway in the piston rod, can reduce the change to original buffer structure to reduce whole volume.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.

FIG. 1 is a schematic cross-sectional view of a conventional oil pressure buffer chamber;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of the area D in FIG. 2;

FIG. 4 is an enlarged partial view of the end of the piston rod;

wherein: 11-a silencing sleeve; 12-a collided head; 13-a gasket; 14-a piston rod; 15-a bearing; 16-a piston; 17-a spring; 18-an inner tube; 19-an outer tube; 10-rear cover; 21-a piston rod; 21 a-axial bore; 21 b-lateral holes; 22-disc spring set; 23-adjusting the ejector rod; 24-an adjustment knob; 25-stop screw; 26-a piston; 27-an inner tube; 27 a-oil drain hole; 27 b-piston drain hole; 28-a return spring; 29-spring guide post; 29 a-a through hole; 30-a cone valve; 30 a-a tapered end; 30 b-contact surface; 30 c-a ring groove; 31-a first sealing ring; 32-a second seal ring; 33-outer tube.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.

A conventional bumper structure is generally shown in fig. 1, and includes a striker 12, a piston rod 14, a piston 16, an inner tube 18, and an outer tube 19, wherein one end of the piston rod 14 is connected to the striker 12, and the other end is connected to the piston 16. A buffer cavity A is arranged in the inner pipe 18, a pressure accumulation cavity B is arranged in the outer pipe 19, an overflow channel C is formed between the inner pipe 18 and the outer pipe 19, and an oil discharge hole is formed in the side wall of the inner pipe 18, so that the buffer cavity A is communicated with the pressure accumulation cavity B. The piston 16 is arranged in the buffer cavity A, and the tail part of the buffer cavity A is provided with the rear cover 10. The front end of the outer tube 19 is provided with a washer 13 and a bearing 15. A spring 18 is also disposed in the cushioning chamber a of the partial damper. When the head 12 is impacted, the piston rod 14 pushes the piston 16 to move to the left in fig. 1, the hydraulic oil in the buffer chamber a is pushed into the pressure storage chamber B through the oil discharge hole, the pressure storage chamber B stores pressure usually through pressure storage cotton or an oil bag, and the flow and pressure storage contraction of the hydraulic oil through the oil discharge hole realize the buffer function. Because there is no channel with changeable section size, when the external condition changes, the problem of bad buffering effect is easy to occur.

As shown in fig. 2, the present embodiment provides a trimming type automatic compensation buffer, the main structure of which is the same as that of the existing buffer, and the buffer is improved in that a compensation channel for communicating a buffer chamber a and a pressure accumulation chamber B is formed in a piston rod 21, a compensation assembly is disposed in the compensation channel, and the compensation assembly is configured to adjust the opening and closing of the compensation channel according to the pressure in the buffer chamber a. Through setting up the compensation subassembly, can open the compensation passageway between cushion chamber A and the pressure accumulation chamber B automatically when external conditions change (for example when high-speed striking), realize the automatic compensation function. Compared with a compensation structure arranged in the buffer cavity A in the prior art, the buffer cavity A fully utilizes the space inside the piston rod 21 by arranging the compensation structure in the piston rod 21, and the whole volume of the buffer cannot be increased.

The compensating assembly needs to be able to deform or displace to open the supplemental channel when subjected to a pressure greater than a threshold. For example, the compensating element may be a rubber element that deforms under pressure. When the pressure in the buffer cavity is low, the rubber part blocks the compensation channel, and when the pressure is increased, the rubber part deforms to open the compensation channel. The other form of the compensation assembly can comprise a movable member and a preload member, wherein the movable member is arranged in the compensation channel, and the preload member is arranged on one side of the movable member, which is far away from the buffer cavity, and provides a preload force for the movable member. For example, the movable member may be a piston, and the preload member may be a spring, wherein when the pressure in the buffer chamber is low, the spring abuts against the piston to block the compensation passage, and when the pressure is increased, the spring is compressed, and the piston moves to open the compensation passage.

In order to provide a large preload in a small space, the disk spring assembly 22 is used as a preload element in this embodiment, since the space in the piston rod is small. The disc spring assembly 22 includes at least one disc spring, and a plurality of disc springs may be connected in series for better effect.

In a possible embodiment, an adjusting structure can be further provided to adjust the pretension force, and thus the trigger pressure value of the compensating structure. The adjusting structure comprises an adjusting ejector rod 23 arranged in the piston rod, one end of the adjusting ejector rod 23 and the disc spring group 22 abut against the other end of the adjusting ejector rod 23 and are connected with an adjusting knob 24, and the adjusting knob 24 is arranged at the end part of the piston rod 21. By screwing the adjusting knob 24, the position of the adjusting tappet 23 can be adjusted so that it abuts the disc spring assembly 22 more or less tightly. A set screw 25 may be further provided at a side of the adjustment knob 24 to fix the adjustment knob 24.

Referring to fig. 3 and 4, the buffer is connected with a piston 26 at one end of the piston rod 21 extending into the buffer cavity a, and a piston oil drain hole 27b is formed in the side wall of the end portion of the buffer cavity a. When the piston 26 presses the hydraulic oil in the cushion chamber a, the hydraulic oil is mainly discharged from the oil discharge hole 27a, and a part of the hydraulic oil also flows out from the gap between the piston 26 and the inner tube 27. Thus, in a possible embodiment, the supplementary channel can communicate with the piston oil drain hole 27b, and the supplementary channel comprises an axial hole 21a opening in the axial direction of the piston rod 21 and a lateral hole 21b opening in the side wall of the piston rod, wherein the lateral hole 21b opens behind the piston 26. When the piston 26 is pushed into the left side of the cushion chamber a, the lateral hole 21b also moves into the cushion chamber a, forming a passage communicating with the piston drain hole 27 b. Through utilizing current piston oil drain hole 27b, need not additionally to inner tube 27 trompil again to this buffer only needs to reform transform the structure on the piston rod 21, has reduced the transformation cost.

In order to enable the automatic return of the piston rod 21, in a possible embodiment a return spring 28 is provided in the buffer chamber a, while a spring guide 29 is embedded in the piston 26 to fix the position of the spring 28. A through hole 29a is opened at the axial center of the spring guide post 29 to communicate the cushion chamber a with the compensation passage in the piston rod 21.

Suitably, the movable member may be a conical valve 30, the conical valve 30 being configured as shown in fig. 4 and including a conical end 30a, the conical end 30a being insertable into the through hole 29a to achieve a blocking effect. The conical valve 30 further comprises a contact surface 30b, which contact surface 30b abuts against the pretension element for transmitting the pretension.

In a possible embodiment, a first sealing ring 31 is provided between the spring guide 29 and the piston 26, an annular groove 30c is provided on the outer circumferential side of the conical valve 30, and a second sealing ring 32 is provided in the annular groove 30c, so that the hydraulic oil can be prevented from leaking out of the piston interior 21 along the adjustment jack 23.

The working process of the buffer is briefly described as follows:

when the collided head receives low-speed collision, the piston rod 21 pushes the piston 26 to extrude the buffer cavity A, hydraulic oil is discharged into the pressure accumulation cavity B through the overflow channel C, and the through hole 29a is blocked by the whole conical valve 30 because the internal pressure generated by the buffer cavity A is smaller than the pretightening force of the disc spring group 22. When the collided head receives high-speed collision, the pressure in the buffer cavity A rises rapidly, the thrust generated by the internal pressure is larger than the pretightening force generated by the disc spring group 22, the conical valve 30 is separated from the spring guide post 29, the compensation channel is opened, hydraulic oil flows into the buffer cavity A from the lateral hole 21b and flows into the overflow channel C through the piston oil discharge hole 27b, and the hydraulic oil can be discharged in time due to the fact that the oil discharge cross section is increased, so that rebound cannot occur, and automatic compensation is achieved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.