CN-122014714-A - High-pressure-resistant piston type hydraulic cylinder with multistage buffering structure

CN122014714ACN 122014714 ACN122014714 ACN 122014714ACN-122014714-A

Abstract

The invention discloses a high-pressure-resistant piston type hydraulic cylinder with a multistage buffering structure, which relates to the technical field of hydraulic cylinders and comprises a cylinder body, a piston rod, a piston, a rotating sleeve, a buffering cavity, an oil outlet gap, a guiding buffering groove and a matching part. According to the invention, the oil is extruded through the rotary sleeve inserted into the buffer cavity, the oil is discharged from the oil outlet gap to form a first-stage hydraulic damping, then the linear motion of the piston rod is converted into the rotary motion of the rotary sleeve through the motion of the rolling part in the spiral buffer groove, a second-stage mechanical damping is formed through the rotary resistance, and finally, in the line Cheng Moduan, the opening degree of the oil outlet gap is regulated through the floating part, the back pressure is further increased, and a third-stage buffering is formed.

Inventors

YAN YUEHONG
SHA HONGBO
FENG HUI
ZHAO YUANZHANG
Ju Honglei
LI DEHUA

Assignees

河南科兴液压科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. The utility model provides a high pressure resistant piston hydraulic cylinder with multistage buffer structure, includes cylinder body (1) and slide set up in piston rod (2) in cylinder body (1), the one end of piston rod (2) is connected with piston (5), its characterized in that, the one end that piston rod (2) stretches into cylinder body (1) coaxial coupling has rotatable swivel boot (6), the bottom of cylinder body (1) is equipped with buffer boot (8); A buffer cavity for inserting the rotary sleeve (6) is formed in the buffer sleeve (8), a plurality of oil outlet gaps (9) communicated with the buffer cavity are formed in the side wall of the buffer sleeve (8) along the axial array, and guide buffer grooves are formed in the inner wall of the buffer cavity; The rotary sleeve (6) is provided with a matching part, when the rotary sleeve (6) is inserted into the buffer cavity, the matching part is matched with the guide buffer groove, and the rotary sleeve (6) can be driven to rotate under the guidance of the guide buffer groove so as to form resistance buffer for the axial movement of the piston rod (2).
2. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 1, wherein an installation sleeve (11) is arranged at one end of the piston rod (2) extending into the cylinder body (1), the rotary sleeve (6) is rotatably sleeved outside the installation sleeve (11) through a bearing, and an abutting block (15) is arranged on the inner wall of the rotary sleeve (6); An arc groove (13) is formed in the outer wall of the mounting sleeve (11), the abutting block (15) stretches into the arc groove (13), a spring (14) is arranged in the arc groove (13), and the spring (14) elastically abuts against the abutting block (15) to provide a reset force for the rotation of the rotating sleeve (6).
3. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 1, wherein the matching part is a rolling part (4) rotatably arranged at the end part of the rotary sleeve (6), and the guide buffering groove comprises a straight section buffering groove (16) and a spiral buffering groove (17) which are communicated with each other; the rolling part (4) can slide into the straight section buffer groove (16) and then slide into the spiral buffer groove (17), and the rolling part (4) drives the rotary sleeve (6) to rotate when sliding in the spiral buffer groove (17).
4. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 3, wherein the rolling part (4) is a sphere, a spherical clamping groove is formed in one end, far away from the piston (5), of the rotary sleeve (6), the rolling part (4) is rotationally embedded in the spherical clamping groove, and the cross section diameters of the straight section buffering groove (16) and the spiral buffering groove (17) are matched with the sphere diameter of the rolling part (4).
5. A high-pressure-resistant piston type hydraulic cylinder with a multistage buffering structure according to claim 3, wherein the straight section buffering groove (16) is located on one side, close to the buffering cavity opening, of the spiral buffering groove (17), and an arc chamfer is arranged at one end, far away from the spiral buffering groove (17), of the straight section buffering groove (16).
6. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 1, wherein a floating adjusting mechanism for adjusting the opening degree of the oil outlet gap (9) is arranged in the buffering sleeve (8).
7. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 6, wherein the floating adjusting mechanism comprises a sliding part (22) and a floating part (18), and an installation cavity is formed at one end of the buffering sleeve (8) far away from the buffering cavity; The sliding part (22) is arranged in the mounting cavity in a sliding mode, the floating part (18) is connected to one side, facing the buffer cavity, of the sliding part (22), an adjusting groove (20) corresponding to the oil outlet gap (9) is formed in the periphery of the floating part (18), and the overlapping area of the adjusting groove (20) and the oil outlet gap (9) can be changed when the floating part (18) slides under pressure.
8. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 7, wherein a plurality of hollowed grooves (19) are formed in the end face of one side of the floating part (18) facing the buffering cavity, and the hollowed grooves (19) are respectively communicated with the buffering cavity and the adjusting groove (20).
9. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 7, wherein a return spring (23) is arranged in the installation cavity, the return spring (23) elastically abuts against one side, far away from the floating part (18), of the sliding part (22), a clamping block (21) is arranged on the periphery of the sliding part (22), and a clamping groove (25) for sliding of the clamping block (21) is formed in the inner wall of the installation cavity.
10. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 7, wherein a mounting sleeve (11) is arranged at one end of the piston rod (2) extending into the cylinder body (1), and the mounting sleeve (11) can be abutted with the floating part (18) along with the movement of the piston rod (2) so as to push the floating part (18) to move, so that the opening degree of the oil outlet gap (9) is reduced.

Description

High-pressure-resistant piston type hydraulic cylinder with multistage buffering structure Technical Field The invention relates to the technical field of hydraulic cylinders, in particular to a high-pressure-resistant piston type hydraulic cylinder with a multistage buffering structure. Background The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The device has simple structure and reliable operation. When it is used to realize reciprocating motion, it can eliminate speed reducer, and has no transmission clearance and smooth motion, so that it can be widely used in hydraulic systems of various machines. In the prior art, hydraulic cylinders for lifting heavy objects are generally provided with a buffer mechanism in the cylinder body to bear axial load. When the weight is lowered, the piston rod is retracted to the tail section, the buffer plunger is inserted into the buffer hole, and back pressure is generated by reducing the sectional area of the oil return channel, so that the piston is forced to be decelerated, and mechanical buffer is realized. However, the above-mentioned structure has a problem in that the buffer plunger is easily worn out due to frequent friction and impact between the buffer plunger and the buffer hole during long-term use. Once the plunger wears, the fit clearance between the plunger and the buffer hole increases, resulting in an increased amount of oil leakage and a consequent reduction in back pressure. This will directly result in a significant reduction of the cushioning effect of the end section of the piston rod, which is prone to impact noise and even damage to the device. Therefore, there is a need for a hydraulic ram structure that compensates for wear clearances or has a redundant cushioning function. Disclosure of Invention The invention aims to provide a high-pressure-resistant piston type hydraulic cylinder with a multistage buffering structure, so as to solve the problems in the prior art. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure comprises a cylinder body and a piston rod arranged in the cylinder body in a sliding mode, wherein one end of the piston rod is connected with a piston, one end of the piston rod extending into the cylinder body is coaxially connected with a rotatable rotating sleeve, and the bottom of the cylinder body is provided with a buffering sleeve; A buffer cavity for the rotary sleeve to be inserted is formed in the buffer sleeve, a plurality of oil outlet gaps communicated with the buffer cavity are formed in the side wall of the buffer sleeve along the axial direction in an array manner, and a guide buffer groove is formed in the inner wall of the buffer cavity; The rotary sleeve is provided with a matching part, when the rotary sleeve is inserted into the buffer cavity, the matching part is matched with the guide buffer groove, and the rotary sleeve can be driven to rotate under the guidance of the guide buffer groove so as to form resistance buffer for the axial movement of the piston rod. Further, a mounting sleeve is arranged at one end of the piston rod extending into the cylinder body, the rotating sleeve is rotatably sleeved outside the mounting sleeve through a bearing, and an abutting block is arranged on the inner wall of the rotating sleeve; The outer wall of the installation sleeve is provided with an arc-shaped groove, the abutting block stretches into the arc-shaped groove, a spring is arranged in the arc-shaped groove, and the spring elastically abuts against the abutting block to provide reset force for the rotation of the rotation sleeve. Further, the matching part is a rolling part rotatably arranged at the end part of the rotary sleeve, and the guide buffer groove comprises a straight section buffer groove and a spiral buffer groove which are communicated with each other; The rolling part can slide into the straight section buffer groove and then slide into the spiral buffer groove, and the rolling part drives the rotary sleeve to rotate when sliding in the spiral buffer groove. Further, the rolling part is a sphere, a spherical clamping groove is formed in one end, far away from the piston, of the rotary sleeve, the rolling part is rotationally embedded in the spherical clamping groove, and the diameters of the sections of the straight section buffer groove and the spiral buffer groove are matched with the spherical diameter of the rolling part. Further, the straight section buffer groove is located on one side, close to the opening of the buffer cavity, of the spiral buffer groove, and an arc chamfer is arranged at one end, far away from the spiral buffer groove, of the straight section buffer groove. 6. The high-pressure-resistant piston type hydraulic cylinder with the multistage buffering structure according to claim 1, wherein a floating adjusting mecha