CN113175459A

CN113175459A - Hydraulic cylinder variable throttling rear buffering device

Info

Publication number: CN113175459A
Application number: CN202110291161.0A
Authority: CN
Inventors: 班明; 王宏斌; 李咏昕; 曹晶; 廖春光; 啜占军; 张亚楠; 杨喆; 王慧海; 张鑫
Original assignee: Xuanhua Iron and Steel Group Co Ltd
Current assignee: Xuanhua Iron and Steel Group Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-07-27

Abstract

The invention relates to a hydraulic cylinder variable throttling rear buffer device, belonging to the technical field of hydraulics. The technical scheme is as follows: the fixed seat (1) is a cylindrical shape matching the cylinder barrel (8), the center of the fixed seat (1) is provided with a center hole matching the telescopic plunger (3), and the There are a plurality of fixing bolt holes (c) connected with the rodless cavity of the hydraulic cylinder in the circumferential direction, the fixing seat (1) is connected with the rear end cover (7) through a plurality of fixing screws (6), and the telescopic plunger ( 3) A cavity capable of accommodating the spring (2) is provided between the rear end cover (7), and the spring (2) is arranged in the cavity between the telescopic plunger (3) and the rear end cover (7), and the spring (2) is telescopic The plunger (3) can extend into the rodless cavity of the hydraulic cylinder through the central hole of the fixing seat (1) under the action of the spring (2). The beneficial effects of the invention are: strong adaptability, stable and reliable buffering function, reducing internal damage of the hydraulic cylinder, and prolonging the service life of the hydraulic cylinder.

Description

Hydraulic cylinder variable throttling rear buffering device

Technical Field

The invention relates to a variable throttling rear buffer device of a hydraulic cylinder, and belongs to the technical field of hydraulic pressure.

Background

The hydraulic cylinder is a hydraulic actuator for converting hydraulic energy into mechanical energy to make linear reciprocating motion (or swinging motion). In the process of realizing reciprocating motion, due to the fact that the piston inside the hydraulic cylinder collides with the end part of the rear cavity of the hydraulic cylinder under the action of other forces such as external force, gravity and the like, after the hydraulic cylinder is used for a period of time, the piston collides with the contact surface of the end part of the rear cavity of the hydraulic cylinder to be damaged to form falling metal particles, oil is polluted, the inner wall of the cylinder barrel is scratched and the cylinder barrel is damaged and sealed to generate internal leakage, the whole hydraulic cylinder cannot be repaired when the hydraulic cylinder is serious, and the whole cylinder is scrapped.

Although the buffer structure is designed in the part of hydraulic cylinders, in actual use, because the operating conditions such as the operating speed, the installation form and the load size of the hydraulic cylinders are different, the hydraulic cylinders adopt a single internal structure buffer form, the buffer effect is not ideal, and especially under the working environment with more frequent metallurgical heavy-load actions, the reliability of the buffer structure of the hydraulic cylinders is a very important key link.

Disclosure of Invention

The invention aims to provide a variable-throttling rear buffer device of a hydraulic cylinder, which has strong adaptability and stable and reliable buffer function, reduces the internal damage of the hydraulic cylinder, prolongs the service life of the hydraulic cylinder, reduces the maintenance cost and solves the problems in the background technology.

The technical scheme of the invention is as follows:

a variable throttling rear buffering device of a hydraulic cylinder comprises a fixed seat, a spring, a telescopic plunger, a fixing screw, a rear end cover, a cylinder barrel and a fixing bolt hole, wherein the fixed seat is in a cylindrical shape matched with the cylinder barrel; the telescopic plunger is in a stepped cylindrical shape and is arranged in a central hole of the fixed seat; the fixing base is connected with the rear end cover through a plurality of fixing screws, a cavity capable of containing a spring is arranged between the telescopic plunger and the rear end cover, the spring is arranged in the cavity between the telescopic plunger and the rear end cover, and the telescopic plunger can stretch into a rodless cavity of the hydraulic cylinder through a center hole of the fixing base under the action of the spring.

The fixing seat is provided with an annular oil groove communicated with the fixing bolt hole, and the rear end cover is provided with a rodless cavity oil port communicated with the annular oil groove.

And a throttling hole communicated with a cavity between the telescopic plunger and the rear end cover is radially arranged on the fixed seat, and a throttling screw is arranged on the throttling hole.

And the throttling hole communicated with the cavity between the telescopic plunger and the rear end cover in the radial direction of the fixing seat is over against the rodless cavity oil port on the rear end cover.

And a sealing ring is arranged between the fixed seat and the telescopic plunger.

And the telescopic plunger is provided with a groove matched with the sealing ring.

And four fixing bolt holes communicated with the rodless cavity of the hydraulic cylinder in the circumferential direction of the fixing seat are uniformly distributed.

The invention has the beneficial effects that: the invention has no negative effect on the normal extension movement of the hydraulic cylinder, only generates damping action when the hydraulic cylinder moves to the bottom short stroke interval in a return stroke, realizes terminal buffering by throttling oil return through the throttling screw with the throttling hole in the radial direction of the fixed seat in the buffering device, reduces the bad impact of the piston of the hydraulic cylinder on the bottom end cover of the hydraulic cylinder, realizes the adjustability of the throttling speed by adjusting the throttling screw with the throttling hole in the radial direction of the fixed seat, and can be detached and replaced after the throttling screw is detached and connected with the rodless cavity oil pipe joint of the hydraulic cylinder on line, thereby realizing the adjustment of the buffering time on line according to requirements.

The invention better solves the problems caused by the impact of the return motion terminal of the hydraulic cylinder, and has the advantages of simple structure, reliable operation, online adjustment and the like. Particularly, in the hydraulic lifting action of the hydraulic stepping cooling bed of the continuous casting machine, the hydraulic cylinder moves once in 24 seconds and works for 24 hours, the steel billet and other dead weight loads act, the return stroke impact of the hydraulic cylinder is large, the frequency is high, the internal impact damage of the hydraulic cylinder is frequent, the application effect is obvious, and the method is worthy of popularization and application.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic view of the installation of the present invention;

FIG. 4 is a schematic drawing of the hydraulic cylinder extending;

FIG. 5 is a schematic view of the retraction of the hydraulic cylinder;

in the figure: fixing base 1, spring 2, flexible plunger 3, sealing washer 4, throttle screw 5, set screw 6, rear end cap 7, cylinder 8, piston 9, rodless chamber hydraulic fluid port a, annular oil groove b, fixing bolt hole c.

Detailed Description

The invention is further illustrated by way of example in the following with reference to the accompanying drawings.

Referring to the attached drawings 1-5, the variable throttling rear buffering device of the hydraulic cylinder comprises a fixed seat 1, a spring 2, a telescopic plunger 3, a fixing screw 6, a rear end cover 7, a cylinder barrel 8 and a fixing bolt hole c, wherein the fixed seat 1 is cylindrical and matched with the cylinder barrel 8, a central hole matched with the telescopic plunger 3 is formed in the center of the fixed seat 1, and a plurality of fixing bolt holes c communicated with a rodless cavity of the hydraulic cylinder are formed in the circumferential direction of the fixed seat 1; the telescopic plunger 3 is in a stepped cylindrical shape, and the telescopic plunger 3 is arranged in a central hole of the fixed seat 1; fixing base 1 is connected with rear end cap 7 through a plurality of set screw 6, is equipped with the cavity that can hold spring 2 between flexible plunger 3 and the rear end cap 7, and spring 2 sets up in the cavity between flexible plunger 3 and rear end cap 7, and flexible plunger 3 can stretch into the rodless intracavity of pneumatic cylinder through the centre bore of fixing base 1 under the effect of spring 2.

In this embodiment, referring to fig. 1, 2 and 3, the telescopic plunger 3 is provided with a sealing groove matched with the sealing ring 4, and four fixing bolt holes c communicated with the rodless cavity of the hydraulic cylinder in the circumferential direction of the fixing seat 1 are uniformly arranged.

The fixed seat 1 is provided with an annular oil groove b communicated with the four fixing bolt holes c, the rear end cover 7 is provided with a rodless cavity oil port a communicated with the annular oil groove b, the fixed seat 1 is radially provided with a throttling hole communicated with a cavity between the telescopic plunger 3 and the rear end cover 7, the throttling hole is over against the rodless cavity oil port a on the rear end cover 7, and a throttling screw 5 is arranged on the throttling hole.

Referring to fig. 3, the specific installation process is as follows: sealing washer 4 is installed in the sealed recess of 3 surfaces of flexible plunger to insert the centre bore of fixing base 1, spring 2 installs in the cavity between flexible plunger 3 and rear end cap 7, buffer inner chamber promptly, and throttle screw 5 installs in the throttle hole on fixing base 1 right side, and throttle screw 5 position is just to the rodless chamber hydraulic fluid port a of rear end cap 7, and fixes buffer through four set screw 6.

Referring to the attached drawing 4, when the hydraulic cylinder is extended, pressure oil enters from an oil port a of a rodless cavity of the hydraulic cylinder, the oil enters the rodless cavity of the hydraulic cylinder through an annular oil supply groove b at the lower part of a fixing seat 1 of the buffer device and four fixing bolt holes c communicated with the annular oil groove b, a piston 9 of the hydraulic cylinder is pushed to be extended, meanwhile, the pressure oil enters an inner cavity of the buffer device through a throttling hole of a throttling screw 5, and the pressure oil and a spring 2 jointly act on a telescopic plunger 3 to extend the telescopic plunger.

Referring to the attached drawing 5, when the hydraulic cylinder does the return stroke action, pressure oil has the oil feed from the hydraulic cylinder pole chamber hydraulic fluid port, hydraulic cylinder rodless chamber fluid passes through four fixing bolt holes c in fixing base 1, the oil return is realized to annular oil feed groove b and the hydraulic cylinder rodless chamber hydraulic fluid port a of fixing base 1 lower part, when hydraulic cylinder piston 9 return stroke, the impact pressure who produces when contacting buffer telescopic plunger 3, make spring 2 and the fluid of buffer telescopic plunger 3 compression buffer inner chamber, the fluid of compressed fluid is through installing the screw 5 throttle oil return of taking the orifice in 1 right flank of buffer fixing base, excrete from hydraulic cylinder rodless chamber hydraulic fluid port a in the lump, because the orifice effect can realize the throttle deceleration, thereby realize the buffering of hydraulic cylinder return stroke motion.

Claims

1. A hydraulic cylinder variable throttling rear buffer device, characterized in that it comprises a fixed seat (1), a spring (2), a telescopic plunger (3), a fixing screw (6), a rear end cover (7), a cylinder The cylinder (8) and the fixing bolt hole (c), the fixing seat (1) is a cylindrical shape that matches the cylinder (8), and the center of the fixing seat (1) is provided with a telescopic plunger (3) that matches The center hole of the fixing seat (1) is provided with a plurality of fixing bolt holes (c) connected with the rodless cavity of the hydraulic cylinder in the circumferential direction; the telescopic plunger (3) is a stepped cylindrical shape, and the telescopic plunger ( 3) Set in the center hole of the fixing seat (1); the fixing seat (1) is connected with the rear end cover (7) through a plurality of fixing screws (6), and the telescopic plunger (3) and the rear end cover (7) A cavity capable of accommodating the spring (2) is arranged therebetween, the spring (2) is arranged in the cavity between the telescopic plunger (3) and the rear end cover (7), and the telescopic plunger (3) can 2), it extends into the rodless cavity of the hydraulic cylinder through the central hole of the fixed seat (1).

2 . The variable throttle rear buffer device for a hydraulic cylinder according to claim 1 , wherein the fixed seat ( 1 ) is provided with an annular oil groove (b) that communicates with the fixed bolt holes (c), 2 . The rear end cover (7) is provided with a rodless cavity oil port (a) that communicates with the annular oil groove (b).

3. A hydraulic cylinder variable throttling rear buffer device according to claim 2, characterized in that: the radial direction of the fixed seat (1) is provided with a telescopic plunger (3) and a rear end cover (7) A throttle hole communicated with the cavities between them, and a throttle screw (5) is arranged on the throttle hole.

4. A hydraulic cylinder variable throttling rear buffer device according to claim 3, characterized in that: the radial direction between the fixed seat (1) and the telescopic plunger (3) and the rear end cover (7) The orifice that communicates with the cavities is facing the rodless chamber oil port (a) on the rear end cover (7).

5. A hydraulic cylinder variable throttle rear buffer device according to claim 1, characterized in that a sealing ring (4) is provided between the fixed seat (1) and the telescopic plunger (3).

6 . The variable throttle rear buffer device of a hydraulic cylinder according to claim 1 , wherein the telescopic plunger ( 3 ) is provided with a groove which is matched with the sealing ring ( 4 ). 7 .

7 . The variable throttle rear buffer device for a hydraulic cylinder according to claim 1 , wherein the fixing bolt hole (c) communicating with the rodless cavity of the hydraulic cylinder in the circumferential direction of the fixing seat (1) is: 7 . Four evenly arranged.