CN219932933U - Wear-resistant piston - Google Patents

Abstract

The utility model belongs to the technical field of cylinder pistons, in particular to a wear-resistant piston, which comprises a shell of a cylinder and a telescopic rod, wherein one end of the telescopic rod stretches into the shell, a piston assembly is sleeved at the end part of the telescopic rod stretching into the shell, the piston assembly comprises a main body and balls, the main body is of an annular structure, an annular groove is formed in the outer side wall of the main body, a storage annular groove is formed in the inner side wall of the main body, through holes are formed in the side wall of the storage annular groove, and a plurality of through holes are communicated with the storage annular groove and the annular groove; through setting up annular groove, sealed grease and ball, through ball and the inside wall direct contact in the casing, and utilize the roll of ball to reduce the friction of piston and casing inside wall, utilize the clearance that sealed grease sealed annular groove and casing are constituteed simultaneously, avoid gaseous contact surface that passes piston and casing, make the cylinder work steadily, avoid causing main part and casing wearing and tearing to influence the result of use of cylinder because of living main part and casing direct sliding contact.

Description

Wear-resistant piston

Technical Field

The utility model relates to the technical field of cylinder pistons, in particular to a wear-resistant piston.

Background

The cylinder guides the piston to make linear reciprocating motion in the cylinder, and is widely applied in the mechanical field, the pneumatic actuator converts the pressure energy of compressed gas into mechanical energy in pneumatic transmission, the cylinder has two types of reciprocating linear motion and reciprocating swing, and the reciprocating linear motion cylinder can be divided into a single-acting cylinder and a double-acting cylinder.

The cylinder comprises a cylinder barrel, an end cover, a piston rod, a sealing piece and the like, the piston is arranged at the end part of the piston rod, the end part of the piston rod stretches into the cylinder barrel, the piston is in sealing and movable contact with the side wall of the cylinder barrel, the cylinder is connected with an air compressor during operation, the air compressor controls the quantity of air at two sides of the piston in the cylinder barrel, and then the pressure at two sides of the piston is changed, so that the piston is forced to linearly move in the cylinder barrel.

After the air cylinder works for a long time, the side wall of the piston is worn due to sliding contact with the side wall of the cylinder barrel, so that a gap exists between the piston and the side wall of the cylinder barrel, when the air compressor charges air to one side of the piston in the cylinder barrel, the air passes through the gap to circulate to the other side of the piston due to poor tightness of the piston and the cylinder barrel, and the piston cannot travel according to a preset length, so that the use effect of the air cylinder is affected; accordingly, a wear resistant piston is proposed to address the above-mentioned problems.

Disclosure of Invention

In order to overcome the defects in the prior art, after the air cylinder works for a long time, the piston rubs with the side wall of the cylinder barrel to generate pores, so that the using effect of the air cylinder is affected.

The technical scheme adopted for solving the technical problems is as follows: the utility model discloses a wear-resistant piston, which comprises a shell of a cylinder and a telescopic rod, wherein one end of the telescopic rod stretches into the shell, a piston assembly is sleeved at the end part of the telescopic rod stretching into the shell, the piston assembly comprises a main body and balls, the main body is of an annular structure, an annular groove is formed in the outer side wall of the main body, a storage annular groove is formed in the inner side wall of the main body, through holes are formed in the side wall of the storage annular groove, a plurality of through holes are communicated with the storage annular groove and the annular groove, sealing grease is arranged in the storage annular groove and the annular groove, a plurality of balls are embedded and mounted on the side wall of the annular groove, the main body is sleeved on the telescopic rod, the balls are in contact with the inner side wall of the shell, and the sealing grease fills a space formed by the annular groove and the shell; the rolling ball is in direct contact with the inner side wall of the shell, friction between the piston and the inner side wall of the shell is reduced by rolling of the rolling ball, and meanwhile, a gap formed by the annular groove and the shell is sealed by sealing grease, so that gas is prevented from passing through a contact surface between the piston and the shell, the cylinder is enabled to work stably, and the influence on the using effect of the cylinder due to abrasion of the main body and the shell caused by direct sliding contact between the movable main body and the shell is avoided; the arrangement of the through holes is convenient for providing a channel for the circulation of the sealing grease so that the sealing grease in the storage ring groove circulates into the annular groove under the action of pressure.

Preferably, the side wall of the annular groove is provided with embedded grooves, a plurality of embedded grooves are opposite to the balls one by one, and the balls are arranged at the embedded grooves.

Preferably, the edges of the two end surfaces of the main body are provided with chamfer structures, and the end wall of the annular groove is in line contact with the side wall of the shell; the arrangement of the end part of the annular groove in line contact with the shell is convenient for the main body to scrape off the sealing grease adhered to the side wall of the shell while moving, and meanwhile, the sealing grease forms a thin oil film on the side wall of the shell, so that the friction force between the end part of the annular groove and the shell is reduced, and meanwhile, the loss of the sealing grease is reduced.

Preferably, two thread structures are symmetrically arranged at one end of the side wall of the telescopic rod, and the two thread structures are positioned at two sides of the piston assembly.

Preferably, a connecting mechanism is arranged at the position of the thread structure and comprises an extrusion pipe body, a spring and an internal thread pipe, wherein the extrusion pipe body and the internal thread pipe are respectively arranged at two ends of the spring, and the internal thread pipe is in threaded connection with the telescopic rod; the arrangement of the spring is convenient for utilizing the self to be in a compression state, and when the sealing grease in the annular groove is reduced and the pressure is reduced, the spring stretches for a certain distance, so that the extruded pipe body stretches into the storage annular groove again.

Preferably, the inner side wall of the extrusion pipe body is in sealing fit with the outer side wall of the telescopic rod, the outer side wall of the extrusion pipe body is in sealing fit with the inner side wall of the main body, and the two end parts of the extrusion pipe bodies are inserted into the storage ring grooves.

The utility model has the advantages that:

1. according to the utility model, the annular groove, the sealing grease and the ball are arranged, the ball is in direct contact with the inner side wall of the shell, the friction between the piston and the inner side wall of the shell is reduced by utilizing the rolling of the ball, and meanwhile, the gap formed by the annular groove and the shell is sealed by utilizing the sealing grease, so that the gas is prevented from passing through the contact surface of the piston and the shell, the cylinder is enabled to work stably, and the influence on the use effect of the cylinder due to the abrasion of the main body and the shell caused by the direct sliding contact of the movable main body and the shell is avoided;

2. according to the utility model, the connecting mechanism is arranged, the extrusion pipe body stretches into the storage ring groove under the action of the spring, and the sealing grease extruding the storage ring groove is conveyed into the annular groove, so that the space formed by the annular groove and the shell is always filled with the sealing grease.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic overall structure of a first embodiment;

FIG. 2 is a schematic diagram of a piston assembly according to the first embodiment;

FIG. 3 is a schematic main structure of the first embodiment;

fig. 4 is a schematic view of a telescopic rod structure according to a second embodiment;

fig. 5 is a schematic view of an extruded tube and a body of the second embodiment.

In the figure: 1. a housing; 2. a telescopic rod; 21. a thread structure; 22. a connecting mechanism; 23. extruding the tube body; 24. a spring; 25. an internally threaded tube; 3. a piston assembly; 31. a main body; 311. an annular groove; 312. embedding grooves; 313. a storage ring groove; 314. a through hole; 32. and (3) rolling balls.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1-3, a wear-resistant piston comprises a shell 1 of a cylinder and a telescopic rod 2, wherein one end of the telescopic rod 2 stretches into the shell 1, a piston assembly 3 is sleeved at the end part of the telescopic rod 2 stretching into the shell 1, the piston assembly 3 comprises a main body 31 and balls 32, the main body 31 is of an annular structure, an annular groove 311 is formed in the outer side wall of the main body 31, a storage annular groove 313 is formed in the inner side wall of the main body 31, an embedded groove 312 is formed in the side wall of the annular groove 311, through holes 314 are formed in the side wall of the storage annular groove 313, the through holes 314 are communicated with the storage annular groove 313 and the annular groove 311, sealing grease is arranged in the storage annular groove 313 and the annular groove 311, the embedded grooves 312 are in one-to-one correspondence with the balls 32, the balls 32 are arranged at the embedded groove 312, the main body 31 is sleeved on the telescopic rod 2, the balls 32 are in contact with the inner side wall of the shell 1, the sealing grease fills the space formed by the annular groove 311 and the shell 1, the edges of the two end faces of the main body 31 are of the chamfer structures, and the end walls of the annular groove 311 are in line contact with the side wall of the shell 1; the through holes 314 are arranged to provide a passage for the circulation of the sealing grease so that the sealing grease in the storage ring groove 313 circulates into the annular groove 311 under the pressure; the arrangement of the end of the annular groove 311 in line contact with the housing 1 facilitates the main body 31 to scrape off the sealing grease adhering to the side wall of the housing 1 while moving, and simultaneously enables the sealing grease to form a thin oil film on the side wall of the housing 1, thereby reducing the friction between the end of the annular groove 311 and the housing 1 and reducing the loss of the sealing grease.

The cylinder guides the piston to carry out the cylinder metal part of straight reciprocating motion in the cylinder, the cylinder is widely used in the mechanical field, the piston is made up of cylinder barrel, end cap, piston rod and seal, etc., the piston is installed in end of the piston rod, the end of the piston rod stretches into cylinder barrel, and the piston is in sealed movable contact with sidewall of the cylinder barrel, the cylinder is connected with air compressor while working, the air compressor controls the quantity of gas of both sides of piston in the cylinder barrel, and then change the pressure of both sides of piston, force the piston to make the rectilinear movement in the cylinder barrel, after the cylinder works for a long time, the sidewall of the piston is worn out because of sliding contact with sidewall of the cylinder barrel, there is a gap between the piston and sidewall of the cylinder barrel, when the air compressor inflates to a certain side of piston in the cylinder barrel, because the piston and cylinder barrel are poor in tightness, the piston can't travel according to the predetermined length, influence the use effect of the cylinder; through the arrangement of the annular groove 311, the sealing grease and the ball 32, the ball 32 is in direct contact with the inner side wall of the shell 1, the friction between the piston and the inner side wall of the shell 1 is reduced by the rolling of the ball 32, and meanwhile, the gap formed by the annular groove 311 and the shell 1 is sealed by the sealing grease, so that gas is prevented from passing through the contact surface of the piston and the shell 1, the cylinder is enabled to work stably, and the influence on the use effect of the cylinder due to abrasion of the main body 31 and the shell 1 caused by the direct sliding contact of the movable main body 31 and the shell 1 is avoided; when in installation; firstly, the ball 32 is embedded and installed in the embedded groove 312, a large amount of sealing grease is filled into the storage ring groove 313, then, the main body 31 is sleeved on the telescopic rod 2, then, the main body 31 and the end part of the telescopic rod 2 extend into the shell 1, when the main body 31 moves to the end part of the shell 1 and the annular groove 311 is still exposed, the sealing grease is filled into the annular groove 311, after the sealing grease is filled, the main body 31 is immersed into the shell 1, meanwhile, the ball 32 is in rolling contact with the shell 1, the sealing grease fills the holes formed by the annular groove 311 and the shell 1, and when the main body 31 moves under the action of pressure, the ball 32 rolls, so that the friction force between the main body 31 and the shell 1 is reduced, and excessive abrasion of the main body 31 is avoided.

Example two

Referring to fig. 4 and 5, in a first comparative example, as another embodiment of the present utility model, two screw structures 21 are symmetrically disposed at one end of a side wall of a telescopic rod 2, the two screw structures 21 are located at two sides of a piston assembly 3, a connecting mechanism 22 is disposed at a position of the screw structures 21, the connecting mechanism 22 comprises an extrusion tube body 23, a spring 24 and an internal screw tube 25, the extrusion tube body 23 and the internal screw tube 25 are respectively installed at two ends of the spring 24, the internal screw tube 25 is in screw connection with the telescopic rod 2, an inner side wall of the extrusion tube body 23 is in sealing fit with an outer side wall of the telescopic rod 2, an outer side wall of the extrusion tube body 23 is in sealing fit with an inner side wall of a main body 31, and ends of the two extrusion tube bodies 23 are inserted into a storage ring groove 313; the extrusion pipe body 23 is arranged so as to extend into the storage ring groove 313, and gradually extends into the storage ring groove 313 under the action of external force to apply pressure to the sealing grease, so that the sealing grease in the storage ring groove 313 is conveyed into the annular groove 311; the spring 24 is provided so as to be in a compressed state by itself, and when the sealing grease in the annular groove 311 is reduced and the pressure is reduced, the spring 24 is extended by a distance so that the squeeze tube 23 is pushed further into the storage ring groove 313.

By arranging the connecting mechanism 22, the extrusion pipe body 23 stretches into the storage ring groove 313 under the action of the spring 24, and sealing grease extruding the storage ring groove 313 is conveyed into the annular groove 311, so that the space formed by the annular groove 311 and the shell 1 is always filled with the sealing grease; when the telescopic rod 2 is sleeved with the main body 31, acting force is applied to the internal thread pipe 25 to enable the internal thread pipe to rotate, the extrusion pipe body 23 is forced to extend into the main body 31, sealing grease in the storage ring groove 313 is extruded to enable the sealing grease to flow to the through hole 314, when the pressure of the sealing grease in the annular groove 311 is reduced, the spring 24 applies acting force to the extrusion pipe body 23 to enable the sealing grease in the storage ring groove 313 to flow to the annular groove 311 to enable the annular groove 311 to be filled with the sealing grease when the pressure of the sealing grease in the annular groove 311 is reduced.

Working principle: after the air cylinder works for a long time, the side wall of the piston is worn due to sliding contact with the side wall of the cylinder barrel, so that a gap exists between the piston and the side wall of the cylinder barrel, and when the air compressor charges air to one side of the piston in the cylinder barrel, the piston cannot travel according to a preset length due to poor tightness of the piston and the cylinder barrel, so that the using effect of the air cylinder is affected; firstly, the ball 32 is embedded in the embedded groove 312, a large amount of sealing grease is filled into the storage ring groove 313, then, the main body 31 is sleeved on the telescopic rod 2, after the main body 31 is sleeved on the telescopic rod 2, acting force is applied to the internal thread tube 25 to enable the internal thread tube 25 to rotate, the extrusion tube 23 is forced to extend into the main body 31, the sealing grease in the storage ring groove 313 is extruded, the sealing grease flows to the through hole 314, then, the ends of the main body 31 and the telescopic rod 2 extend into the shell 1, when the main body 31 moves to the end of the shell 1 and the annular groove 311 is still exposed, the sealing grease is filled into the annular groove 311, after the sealing grease is filled, the main body 31 is immersed into the shell 1, meanwhile, the ball 32 is in rolling contact with the shell 1, and the sealing grease fills the holes formed by the annular groove 311 and the shell 1, when the main body 31 moves under the action of pressure, the ball 32 rolls, friction force between the main body 31 and the shell 1 is reduced, the sealing grease in the annular groove 313 is prevented from being excessively worn, and when the sealing grease in the annular groove 311 reduces the pressure, the sealing grease in the annular groove 311 is excessively reduced, the sealing grease is filled into the annular groove 311, and the sealing grease is fully filled into the annular groove 311.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims (6)

1. The utility model provides a wearability piston, includes casing (1) and telescopic link (2) of cylinder, telescopic link (2) one end stretches into in casing (1), its characterized in that: the telescopic rod (2) stretches into end cover in casing (1) and is equipped with piston assembly (3), piston assembly (3) are including main part (31) and ball (32), main part (31) set up to annular structure, annular groove (311) have been seted up to main part (31) lateral wall and annular groove (313) have been seted up to the inside wall, through-hole (314) have been seted up to the lateral wall of annular groove (313), a plurality of through-hole (314) communicate with each other with annular groove (313) and annular groove (311), be provided with sealed grease in annular groove (313) and annular groove (311), a plurality of ball (32) are inlayed and are installed on the lateral wall of annular groove (311), main part (31) cover is established on telescopic rod (2), ball (32) contact with casing (1) inside wall, sealed grease fills the space that annular groove (311) and casing (1) are constituteed.

2. A wear resistant piston in accordance with claim 1 wherein: the side wall of the annular groove (311) is provided with embedded grooves (312), a plurality of embedded grooves (312) are opposite to the balls (32) one by one, and the balls (32) are arranged at the embedded grooves (312).

3. A wear resistant piston in accordance with claim 2 wherein: the edges of the two end faces of the main body (31) are respectively provided with a chamfer structure, and the end wall of the annular groove (311) is in line contact with the side wall of the shell (1).

4. A wear resistant piston in accordance with claim 3 wherein: two thread structures (21) are symmetrically arranged at one end of the side wall of the telescopic rod (2), and the two thread structures (21) are located at two sides of the piston assembly (3).

5. A wear resistant piston in accordance with claim 4 wherein: the connecting mechanism (22) is arranged at the position of the threaded structure (21), the connecting mechanism (22) comprises an extrusion pipe body (23), a spring (24) and an internal threaded pipe (25), the extrusion pipe body (23) and the internal threaded pipe (25) are respectively arranged at two ends of the spring (24), and the internal threaded pipe (25) is in threaded connection with the telescopic rod (2).

6. A wear resistant piston in accordance with claim 5 wherein: the inner side wall of the extrusion pipe body (23) is in sealing fit with the outer side wall of the telescopic rod (2), the outer side wall of the extrusion pipe body (23) is in sealing fit with the inner side wall of the main body (31), and the end parts of the two extrusion pipe bodies (23) are inserted into the storage ring grooves (313).