CN217462725U

CN217462725U - High-pressure unloading structure of hydraulic cylinder

Info

Publication number: CN217462725U
Application number: CN202221382643.3U
Authority: CN
Inventors: 江明正; 吴李; 蔡烈树
Original assignee: Anqing Zhengbin Building Material Machinery Manufacturing Co ltd
Current assignee: Anqing Zhengbin Building Material Machinery Manufacturing Co ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-09-20
Anticipated expiration: 2032-06-02

Abstract

The utility model relates to a pneumatic cylinder technical field especially relates to a high pressure off-load structure of pneumatic cylinder, including hydraulic cylinder body, the internal piston assembly that is provided with of pneumatic cylinder, piston assembly with hydraulic cylinder body sliding connection, piston assembly includes the piston body, the piston body cup joints inside the hydraulic cylinder body, just the piston body with hydraulic cylinder body sliding connection, the top surface fixedly connected with piston rod body of piston body. According to the high-pressure unloading structure of the hydraulic cylinder, the first oil duct and the second oil duct are arranged, the second oil duct is located above the first oil duct, when the pushing part is moved by external force, the pushing part is moved to the position of the first oil duct at first to enable two ends of the first oil duct to be communicated, then the pushing part is moved to the position of the second oil duct to enable two ends of the second oil duct to be communicated, so that gradual unloading is achieved, damage to a hydraulic cylinder body due to instant unloading is avoided, and the service life of the hydraulic cylinder body is prolonged.

Description

High-pressure unloading structure of hydraulic cylinder

Technical Field

The utility model relates to a pneumatic cylinder technical field especially relates to a high pressure off-load structure of pneumatic cylinder.

Background

The hydraulic oil cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and does linear reciprocating motion or swinging motion, when the hydraulic oil cylinder is used for realizing reciprocating motion, a speed reducer can be omitted, no transmission gap exists, and the motion is stable, so that the hydraulic oil cylinder is widely applied to hydraulic systems of various machines, and the output force of the hydraulic oil cylinder is in direct proportion to the effective area of a piston and the pressure difference between the two sides of the piston; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device, and the unloading structure has the functions of reducing power loss, reducing system heating and prolonging the service life of a hydraulic pump and a motor.

At present, a high-pressure unloading structure of a hydraulic cylinder on the market is usually opened instantly, so that impact load is reduced rapidly, but the rapid unloading can cause the pressure in the hydraulic cylinder to change rapidly instantly, so that impact is caused on a hydraulic cylinder body, and the service life of the hydraulic cylinder body is influenced.

SUMMERY OF THE UTILITY MODEL

Based on the high pressure off-load structure technical problem of current pneumatic cylinder, the utility model provides a high pressure off-load structure of pneumatic cylinder of gradual off-load.

The utility model provides a high pressure unloading structure of hydraulic cylinder, including the hydraulic cylinder body, be provided with the piston assembly in the pneumatic cylinder body, the piston assembly with hydraulic cylinder body sliding connection, the piston assembly includes the piston body, the piston body cup joints in the hydraulic cylinder body, and the piston body with hydraulic cylinder body sliding connection, the top surface of piston body fixedly connected with the piston rod body, the piston rod body upwards extends to the outside of hydraulic cylinder body, the bottom surface of piston body is provided with the off-load recess, be provided with the promotion part in the off-load recess, the promotion part with the off-load recess sliding connection, be provided with first oil duct on the inner wall of off-load recess, first oil duct extends to the top surface of piston body, be provided with the second oil duct above the first oil duct, the second oil duct with first oil duct parallel arrangement, and the second oil passage extends to the top surface of the piston body.

Preferably, the number of the first oil passages is multiple, the multiple first oil passages are uniformly arranged along the circumferential direction of the inner wall of the unloading groove, and the number of the second oil passages is the same as that of the first oil passages.

Through the technical scheme, the first oil duct is unloaded firstly, and then the second oil duct is unloaded, so that gradual unloading is realized, the hydraulic cylinder body is prevented from being impacted by high pressure instantly, and the service life of the hydraulic cylinder body is prolonged.

Preferably, the first oil passage is of an L-shaped structure, the first oil passage extends horizontally and transversely in the piston body, and then changes direction to extend towards the top surface of the piston body, and the second oil passage is of the same structure as the first oil passage.

Through the technical scheme, the first oil channel and the second oil channel which are arranged in parallel gradually unload, so that the pressure difference during unloading is reduced.

Preferably, the pushing component comprises a first connecting portion, a blocking portion is fixedly connected to the bottom of the first connecting portion, a driving portion is fixedly connected to the bottom of the blocking portion, and the driving portion extends to the bottom of the unloading groove.

Through above-mentioned technical scheme, the shutoff portion carries out the shutoff with first oil duct and second oil duct, avoids first oil duct and second oil duct oil feed.

Preferably, a second connecting portion is arranged in the unloading groove, the first connecting portion is of a boss structure, the second connecting portion is of a recessed structure, the first connecting portion is accommodated in the second connecting portion, and the first connecting portion is in sliding connection with the second connecting portion.

Through the technical scheme, the first connecting part is accommodated in the second connecting part, and the first connecting part is connected with the second connecting part in a sliding manner, so that the pushing part can move up and down along the unloading groove.

Preferably, a spring is arranged at the top of the first connecting part, and the top of the spring is abutted to the unloading groove.

Through above-mentioned technical scheme, the spring sets up the position between first connecting portion and the off-load recess, and the elasticity through the spring will promote the part and reset, avoids first oil duct and second oil duct to open when not the off-load.

Preferably, it is characterized in that: the driving part is provided with at least one inclined surface, and the inclined surface faces the first oil channel direction.

Through above-mentioned technical scheme, the inclined plane is convenient for and first oil duct and second oil duct between produce the clearance, the hydraulic oil of being convenient for gets into first oil duct and second oil duct.

The utility model provides a beneficial effect does:

1. by arranging the first oil duct and the second oil duct, the second oil duct is positioned above the first oil duct, when the pushing component is moved by external force, the pushing component is firstly moved to the position of the first oil duct to enable the two ends of the first oil duct to be communicated, and then the pushing component is moved to the position of the second oil duct to enable the two ends of the second oil duct to be communicated, so that gradual unloading is realized, damage to a hydraulic cylinder body caused by instant unloading is avoided, and the service life of the hydraulic cylinder body is prolonged.

2. Through setting up the pushing component, the pushing component includes first connecting portion, the bottom fixedly connected with shutoff portion of first connecting portion, the bottom fixedly connected with drive division of shutoff portion, and the shutoff portion is located first oil duct and second oil duct position, and shutoff portion and off-load recess inner wall in close contact with to prevent first oil duct and second oil duct both ends intercommunication when non-off-load state, improve the availability factor of hydraulic cylinder.

Drawings

Fig. 1 is an axial view of a high pressure unloading structure of a hydraulic cylinder provided by the present invention;

fig. 2 is a schematic structural view of a piston assembly of a high pressure unloading structure of a hydraulic cylinder according to the present invention;

fig. 3 is a sectional view of a piston assembly of a high pressure unloading structure of a hydraulic cylinder according to the present invention;

fig. 4 is an enlarged schematic view of the utility model at a in fig. 3;

fig. 5 is a schematic structural view of a pushing component of a high-pressure unloading structure of a hydraulic cylinder.

In the figure: 1. a hydraulic cylinder block; 2. a piston assembly; 201. a piston body; 2011. an unloading groove; 2012. a first oil passage; 2013. a second oil passage; 2014. a second connecting portion; 202. a piston rod body; 3. a pushing member; 301. a first connection portion; 302. a plugging section; 303. a drive section.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-5, a high-pressure unloading structure of a hydraulic cylinder comprises a hydraulic cylinder body 1 and a piston assembly 2, wherein the hydraulic cylinder body 1 is a hollow circular columnar structure, the piston assembly 2 is connected inside the hydraulic cylinder body 1 in a vertical sliding manner, the hollow structure of the hydraulic cylinder body 1 is used for containing hydraulic oil, and the piston assembly 2 is moved up and down in a reciprocating manner under the action of the hydraulic oil pressure.

Hydraulic cylinder body 1 is the metal material, and hydraulic cylinder body 1 has the diapire and centers on the lateral wall that the diapire upwards extends, and the top relative with the diapire is open structure, and piston assembly 2 gets into hydraulic cylinder body 1 through open position inside, and open position is provided with the end cover, and the end cover will open the position and seal, avoids hydraulic oil to reveal, influences the result of use.

The piston assembly 2 comprises a piston body 201, the piston body 201 is a circular columnar structure, the outer diameter of the piston body 201 is matched with the size of a hollow structure in the hydraulic cylinder body 1, the piston body 201 is sleeved in the hydraulic cylinder body 1, the piston has a top surface, a bottom surface and a side surface connected between the top surface and the bottom surface, the side surface of the piston body 201 is in close contact with the inner wall of the hydraulic cylinder body, the hollow structure of the hydraulic cylinder body 1 is divided into two relatively independent chambers by the piston body 201, a piston rod body 202 is fixedly connected to the top surface of the piston body 201, the piston rod body 202 is a circular columnar structure, the piston rod body 202 extends upwards to the outer side of the hydraulic cylinder body 1, the piston rod body 202 is used for connecting external equipment so as to drive the external equipment, an unloading groove 2011 is arranged on the bottom surface of the piston body 201, and a first oil duct 2012 extends to the top surface of the piston body 201, first oil duct 2012 communicates the chambers at two ends of piston body 201, there is pushing component 3 in unloading groove 2011, first oil duct 2012 is provided on the side wall of unloading groove 2011, pushing component 3 is located first oil duct 2012 position, in the initial state, pushing component 3 blocks first oil duct 2012, avoid the chamber at two ends of piston body 201 to communicate, when needs are unloaded, pushing component 3 moves and makes first oil duct 2012 expose, thereby make the chamber at two ends of piston body 201 communicate, and thus make the both ends load the same.

First oil duct 2012 is an L-shaped structure, one end of first oil duct 2012 is disposed on the inner wall of unloading groove 2011, the other end of first oil duct 2012 is disposed on the top surface of piston body 201, and first oil duct 2012 extends horizontally and laterally inside piston body 201, and then changes direction to extend toward the top surface of piston body 201, so as to avoid opening the port of first oil duct 2012 by the pressure of hydraulic oil.

The number of the first oil channels 2012 is multiple, and the multiple first oil channels 2012 are uniformly arranged along the circumferential direction of the inner wall of the unloading groove 2011, so as to accelerate the unloading speed, and it can be understood that the number of the first oil channels 2012 can be set according to actual use requirements.

A second oil duct 2013 is further arranged above the first oil duct 2012, the second oil duct 2013 is arranged in parallel with the first oil duct 2012, and the second oil duct 2013 and the first oil duct 2012 are identical in structure, so that the two ends of the first oil duct 2012 are communicated when the pushing component 3 moves, the two ends of the second oil duct 2013 are communicated, oil pressures at the two ends of the piston body 201 are gradually balanced, instantaneous unloading is avoided, damage to the hydraulic cylinder 1 is avoided, and the service life is prolonged.

The pushing component 3 is of an annular structure, the pushing component 3 is accommodated in the unloading groove 2011, the pushing component 3 is in sliding connection with the unloading groove 2011, the pushing component 3 comprises a first connecting portion 301, a second connecting portion 2014 is arranged in the unloading groove 2011, the first connecting portion 301 is of a boss structure, the second connecting portion 2014 is of a recessed structure, the first connecting portion 301 is accommodated in the second connecting portion 2014, the first connecting portion 301 is in sliding connection with the second connecting portion 2014, and the first connecting portion 301 is matched with the second connecting portion 2014 to enable the pushing component 3 to be in sliding connection with the unloading groove 2011; the bottom of the first connecting portion 301 is fixedly connected with a blocking portion 302, the blocking portion 302 is located at the opening positions of the first oil passage 2012 and the second oil passage 2013, and the blocking portion 302 is in close contact with the inner wall of the unloading groove 2011 and is used for blocking the first oil passage 2012 and the second oil passage 2013; the bottom of the blocking portion 302 is fixedly connected with a driving portion 303, the driving portion 303 extends to the bottom of the unloading groove 2011, and the driving portion 303 is used for contacting with the inner wall of the hydraulic cylinder 1, so that the pushing member 3 is driven to move along the unloading groove 2011.

At least one inclined surface is arranged on the driving portion 303, the inclined surface faces the direction of the first oil duct 2012, in an initial state, the driving portion 303 is located at the bottom of the unloading groove 2011 and moves into the unloading groove 2011 after external force is applied, and a gap is formed between the inclined surface and the first oil duct 2012 and between the inclined surface and the second oil duct 2013, so that the two ends of the first oil duct 2012 are communicated with the two ends of the second oil duct 2013, the cavities at the two ends of the piston body 201 are communicated, and unloading operation is achieved.

The top of first connecting portion 301 is provided with the spring, and the top and the unloading recess 2011 of spring closely offset, and the spring is used for the drive to promote the part 3 and resumes initial condition, and the quantity of spring is a plurality of, and a plurality of springs evenly set up along first connecting portion 301 circumference.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a high pressure off-load structure of pneumatic cylinder, includes hydraulic cylinder body (1), be provided with piston assembly (2) in hydraulic cylinder body (1), piston assembly (2) with hydraulic cylinder body (1) sliding connection, its characterized in that: the piston assembly (2) comprises a piston body (201), the piston body (201) is sleeved inside the hydraulic cylinder body (1), the piston body (201) is connected with the hydraulic cylinder body (1) in a sliding manner, a piston rod body (202) is fixedly connected to the top surface of the piston body (201), the piston rod body (202) upwards extends to the outside of the hydraulic cylinder body (1), an unloading groove (2011) is formed in the bottom surface of the piston body (201), a pushing part (3) is arranged in the unloading groove (2011), the pushing part (3) is connected with the unloading groove (2011) in a sliding manner, a first oil duct (2012) is arranged on the inner wall of the unloading groove (2011), the first oil duct (2012) extends to the top surface of the piston body (201), and a second oil duct (2013) is arranged above the first oil duct (2012), the second oil passage (2013) is arranged in parallel with the first oil passage (2012), and the second oil passage (2013) extends to the top surface of the piston body (201).

2. The high pressure unloading structure of a hydraulic cylinder according to claim 1, wherein: the number of the first oil channels (2012) is a plurality of, and a plurality of the first oil channels (2012) are evenly arranged along the circumference of the inner wall of the unloading groove (2011), and the number of the second oil channels (2013) is the same as that of the first oil channels (2012).

3. The high pressure unloading structure of a hydraulic cylinder according to claim 2, wherein: the first oil channel (2012) is in an L-shaped structure, the first oil channel (2012) horizontally and transversely extends in the piston body (201) and then changes direction to extend towards the top surface of the piston body (201), and the second oil channel (2013) is the same as the first oil channel (2012) in structure.

4. The high pressure unloading structure of a hydraulic cylinder according to claim 1, wherein: the pushing component (3) comprises a first connecting portion (301), the bottom of the first connecting portion (301) is fixedly connected with a blocking portion (302), the bottom of the blocking portion (302) is fixedly connected with a driving portion (303), and the driving portion (303) extends to the bottom of the unloading groove (2011).

5. The high pressure unloading structure of a hydraulic cylinder according to claim 4, wherein: be provided with second connecting portion (2014) in unloading recess (2011), first connecting portion (301) are boss structure, second connecting portion (2014) are sunk structure, first connecting portion (301) holding is in second connecting portion (2014), just first connecting portion (301) with second connecting portion (2014) sliding connection.

6. The high pressure unloading structure of the hydraulic cylinder according to claim 5, characterized in that: the top of the first connecting portion (301) is provided with a spring, and the top of the spring is abutted to the unloading groove (2011).

7. The high pressure unloading structure of a hydraulic cylinder according to claim 4, wherein: the driving portion (303) has at least one inclined surface facing the first oil passage (2012).