CN213235612U

CN213235612U - Oil cylinder buffer mechanism

Info

Publication number: CN213235612U
Application number: CN202022222312.0U
Authority: CN
Inventors: 宋西华; 李志红; 刘强强; 段忠全; 童文强; 杨民正; 孔园园; 李世年
Original assignee: Bengbu Yeli Machinery Co ltd
Current assignee: Bengbu Yeli Machinery Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-05-18
Anticipated expiration: 2030-09-30

Abstract

An oil cylinder buffer mechanism comprises a piston, a buffer sleeve and a spring; a buffer cavity with a circular cross section is arranged at the rear side of the piston, and the rear side of the buffer cavity is open; the cushion collar includes first portion and second portion, first position in the cushion chamber and with cushion chamber sliding fit, second portion ranging back surpasss the piston rear side, be equipped with the perforation of lining up the cushion collar in the cushion collar, the perforation is by the degressive first hole of diameter in proper order, the second hole, the third hole constitutes, the cushion collar corresponds second hole department and is equipped with the throttle aperture that runs through the cushion collar, the downthehole case that is equipped with of second, the case is the cylinder, the case front side is sealed, the rear side is uncovered, case and second hole sliding fit, the case front side is equipped with the cone head and is conical surface sealed with second hole rear side, the case axial is equipped with radially runs through the inside and outside through-hole of case, the cushion chamber is located to the spring, the spring front side links to each other with the cushion chamber bottom, the spring rear side supports with first hole rear. The mechanism has the advantages of good buffering effect, simple structure, reliable performance and low cost.

Description

Oil cylinder buffer mechanism

Technical Field

The utility model relates to a hydro-cylinder buffer gear.

Background

The piston cylinder has an obvious impact phenomenon when extending and retracting to the tail end, resulting in poor stability of the cylinder. The existing solutions are of two types, namely two buffer sleeves are respectively assembled on a cylinder bottom and a piston, and a buffer effect is achieved by utilizing a gap between the two buffer sleeves. In addition, the traditional oil cylinder buffering needs to install buffering sleeves on the cylinder bottom and the piston respectively, high coaxiality requirements exist between the cylinder bottom and the piston, welding structures are purchased on the cylinder bottom, and coaxiality is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a hydro-cylinder buffer gear is provided, its buffering effect is good, simple structure, dependable performance, with low costs.

In order to solve the technical problem, the utility model provides an oil cylinder buffer mechanism, which comprises a piston, a buffer sleeve and a spring;

the side of the piston, which is far away from the cylinder bottom in the axial direction, in the oil cylinder is the front side, and the side, which is close to the cylinder bottom, is the back side, the back side of the piston is provided with a buffer cavity with a circular cross section, and the back side of the buffer cavity is open;

the buffer sleeve comprises a first portion and a second portion which are coaxially arranged in the front and the back and are cylindrical, the diameter of the first portion is larger than that of the second portion, the first portion is located in the buffer cavity and is in sliding fit with the buffer cavity, the second portion extends backwards and exceeds the rear side of the piston, a through hole which penetrates through the buffer sleeve along the axial direction is arranged in the buffer sleeve, the through hole is formed by a first hole, a second hole and a third hole which are sequentially communicated from front to back and are coaxial, the diameters of the first hole, the second hole and the third hole are sequentially reduced, a conical surface transition section is arranged between the second hole and the third hole, a throttling small hole which penetrates through the buffer sleeve along the radial direction is arranged at the position of the buffer sleeve corresponding to the second hole, a valve core is arranged in the axial direction of the first hole and is arranged in the axial direction of the second hole, the front side of the valve core is sealed, the rear side of the valve core is open, the length of the valve core along, the front side of the valve core is provided with a conical head, the conical head and a conical surface transition section are sealed in a conical surface manner, and the valve core is axially provided with a through hole which radially penetrates through the inside and the outside of the valve core;

the spring is arranged in the buffer cavity along the axial direction of the piston, the front side of the spring is connected with the bottom of the buffer cavity, and the rear side of the spring is abutted against the rear side of the first hole.

For the sake of simple explanation, the following is the present mechanism for a cylinder cushioning mechanism of the present invention.

The using state of the mechanism is as follows: when the piston moves backwards to the tail end, the buffer sleeve can firstly contact the end face of the oil cylinder, then the buffer cavity between the buffer sleeve and the piston can be pressurized, hydraulic oil in the buffer cavity can sequentially pass through the first hole and the second hole to enter the valve core, then the hydraulic oil passes through the through hole of the valve core and flows out of the throttling small hole in the buffer sleeve to enter the cylinder barrel, according to analysis and test, the throttling small hole with the proper size is selected, the effect of piston deceleration is achieved, then the oil cylinder can decelerate stably when the tail end, and the shaking of the oil cylinder is reduced. When the oil pressure drives the piston to move forwards, hydraulic oil enters the buffer sleeve from the third hole, pushes the valve core forwards to open the conical surface seal and enter the buffer cavity, and meanwhile, the spring rebounds to assist the buffer sleeve to reset. When the piston moves backwards again, the hydraulic oil pushes the valve core backwards, the conical head of the valve core and the conical surface transition section form conical surface sealing again, and when the piston moves backwards to the tail end, the buffer mechanism acts on the piston again, so that the reciprocating operation is carried out.

The advantages of the mechanism are that: the mechanism has the advantages of good buffering effect, simple structure, reliable performance and low cost, and in addition, because the buffering pressure of the mechanism is only between the piston and the buffering sleeve, the mechanism has no influence on other parts of the oil cylinder, particularly sealing elements and welding lines, the performance of the oil cylinder can be indirectly improved, and the service life of the oil cylinder can be indirectly prolonged.

In order to achieve better use effect of the mechanism, the preferable scheme is as follows:

preferably, an annular step is formed at the joint of the first part and the second part, a retaining ring extending inwards is arranged at the position, corresponding to the annular step, in the buffer cavity, and the rear side of the annular step is abutted against the retaining ring.

The retaining ring can prevent the buffer sleeve from slipping from the rear side of the buffer cavity.

Preferably, the joint of the first hole and the second hole is in step transition, a gasket matched with the first hole is arranged on the rear side in the first hole, and the rear side of the spring abuts against the gasket.

The gasket can increase the radial width of the step at the joint of the first hole and the second hole, the contact area of the gasket and the spring is increased, and the contact is more stable.

Drawings

Fig. 1 is a schematic structural view of the present mechanism.

Detailed Description

Referring to fig. 1, an oil cylinder buffer mechanism comprises a piston 1, a buffer sleeve 2 and a spring 3;

the side, far away from the cylinder bottom, of the piston 1 in the oil cylinder along the axial direction is front, the side, close to the cylinder bottom, is rear, a buffer cavity 11 with a circular cross section is arranged on the rear side of the piston 1, and the rear side of the buffer cavity 11 is open;

buffer sleeve 2 is including around coaxial arrangement and be columniform first portion 21 and second portion 22, the diameter of first portion 21 is greater than the diameter of second portion 22, first portion 21 be located cushion chamber 11 and with cushion chamber 11 sliding fit, second portion 22 extends backward and surpasss piston 1 rear side, first portion 21 and second portion 22 join the department and form an annular step, correspond annular step department on the cushion chamber 11 internal position and be equipped with retaining ring 12 of inside extension, annular step rear side and retaining ring 12 counterbalance. The buffer sleeve 2 is internally provided with a through hole which penetrates through the buffer sleeve 2 along the axial direction, the through hole is composed of a first hole 23, a second hole 24 and a third hole 25 which are sequentially communicated from front to back and are coaxial, the first hole 23, the diameters of the second hole 24 and the third hole 25 are sequentially reduced, a conical surface transition section 26 is arranged between the second hole 24 and the third hole 25, a throttling small hole 241 which penetrates through the buffer sleeve 2 along the radial direction is arranged at the position, corresponding to the second hole 24, of the buffer sleeve 2, a valve core 4 is arranged in the second hole 24, the valve core 4 is a cylinder body which is arranged along the axial direction of the first hole 23, the front side of the valve core 4 is sealed, the rear side of the valve core 4 is open, the length of the valve core 4 along the axial direction is smaller than that of the second hole 24 along the axial direction, the valve core 4 is in sliding fit with the second hole 24, a conical head 42 is arranged on the front side of the valve core 4, the conical head 42 and the conical surface transition section 26 are in;

the spring 3 is arranged in the buffer cavity 11 along the axial direction of the piston 1, the front side of the spring 3 is connected with the bottom of the buffer cavity 11, the joint of the first hole 23 and the second hole 24 is in step transition, the back side in the first hole 23 is provided with a gasket 231 matched with the first hole 23, and the back side of the spring 3 is abutted against the gasket 231.

The using state of the mechanism is as follows: when the piston 1 moves backwards to the tail end, the buffer sleeve 2 can firstly contact the end face of the oil cylinder, then the buffer cavity 11 between the buffer sleeve 2 and the piston 1 can bear pressure, hydraulic oil in the buffer cavity 11 can sequentially pass through the first hole 23 and the second hole 24 to enter the valve core 4, then the hydraulic oil flows out of the through hole 41 of the valve core 4 through the throttling small hole 241 on the buffer sleeve 2 to enter the cylinder barrel, according to analysis and test, the throttling small hole 241 with the proper size is selected, the speed reduction effect of the piston 1 is achieved, then the oil cylinder can stably reduce the speed at the tail end, and the shaking of the oil cylinder is reduced. When the piston 1 is driven by oil pressure to move forwards, hydraulic oil enters the buffer sleeve 2 from the third hole 25, pushes the valve core 4 forwards to open the conical surface seal, enters the buffer cavity 11, and meanwhile, the spring 3 rebounds to assist the buffer sleeve 2 to reset. When the piston 1 moves backwards again, the hydraulic oil pushes the valve core 4 backwards, the conical head 42 of the valve core 4 and the conical transition section 26 form a conical surface seal again, and when the piston 1 moves backwards to the tail end, the buffer mechanism acts on the piston 1 again, and the process is repeated.

The advantages of the mechanism are that: the mechanism has the advantages of good buffering effect, simple structure, reliable performance and low cost, and in addition, because the buffering pressure of the mechanism is only between the piston 1 and the buffer sleeve 2, the mechanism has no influence on other parts of the oil cylinder, especially sealing elements and welding lines, and can indirectly improve the performance of the oil cylinder and prolong the service life of the oil cylinder.

The retainer ring 12 can prevent the buffer sleeve 2 from sliding off from the rear side of the buffer cavity 11.

The washer 231 may increase the radial width of the step at the junction of the first hole 23 and the second hole 24, and the contact area with the spring 3 is increased, and the contact is more stable.

Claims

1. The utility model provides an hydro-cylinder buffer gear which characterized in that: comprises a piston, a buffer sleeve and a spring;

2. The cylinder cushion mechanism of claim 1, wherein: the joint of the first part and the second part forms an annular step, a retaining ring extending inwards is arranged at the position corresponding to the annular step in the buffer cavity, and the rear side of the annular step is abutted against the retaining ring.

3. The cylinder cushion mechanism of claim 1, wherein: the joint of the first hole and the second hole is in step transition, a gasket matched with the first hole is arranged on the rear side in the first hole, and the rear side of the spring is abutted against the gasket.