CN111022417A

CN111022417A - Buffering hydraulic cylinder

Info

Publication number: CN111022417A
Application number: CN201911072181.8A
Authority: CN
Inventors: 刘莉华
Original assignee: Yangzhou Zhuorei Hydraulic Equipment Technology Co Ltd
Current assignee: Yangzhou Zhuorei Hydraulic Equipment Technology Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-04-17

Abstract

The invention relates to the technical field of hydraulic equipment, in particular to a buffer hydraulic cylinder. The adjustable one-way throttle valve comprises a cylinder barrel, wherein an end cover and a base are respectively installed at two ends of the cylinder barrel, a piston and a guide sleeve are sleeved on a piston rod in the cylinder barrel, the cylinder barrel comprises a first cylinder barrel and a second cylinder barrel, the piston and the guide sleeve are respectively matched with the first cylinder barrel and the second cylinder barrel in a sealing mode, a first buffer spring is fixed in a buffer cavity of the base, the free end of the first buffer spring is fixedly connected with the tail end of the piston rod, a second buffer spring is fixed in an annular hole in the top of the left end of the second cylinder barrel, the free end of the second buffer spring is fixedly connected with a buffer plate, the free end of a third buffer spring on the right side of the end cover is fixedly connected with the piston and sleeved outside the piston rod, and an adjustable one-way. Through the combined action of the spring and the throttle, the running speed of the piston is reduced before the piston runs to a dead point, the piston is reset, and the reliability of equipment is improved.

Description

Buffering hydraulic cylinder

Technical Field

The invention relates to the technical field of hydraulic equipment, in particular to a buffer hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion. It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems.

In the prior art, when the hydraulic cylinder moves to a stroke terminal at a high speed, violent mechanical collision often occurs, the cylinder body is broken seriously, the mechanical impact is generated, the working performance of mechanical equipment is influenced, other elements of the hydraulic cylinder and a hydraulic system are damaged, great danger is realized, and the service life of the equipment is greatly shortened in long-time work.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a self-resetting buffer hydraulic cylinder.

The invention is realized by the following technical scheme:

a buffer hydraulic cylinder comprises a cylinder barrel, wherein an end cover and a base are respectively installed at the left end and the right end of the cylinder barrel, a piston rod is arranged in the cylinder barrel, a piston and a guide sleeve are sleeved on the piston rod, the cylinder barrel comprises a first cylinder barrel and a second cylinder barrel, the piston is in sealing fit with the first cylinder barrel, the guide sleeve is in sealing fit with the second cylinder barrel, a buffer cavity is formed in the middle of the base, a first buffer spring is fixed in the buffer cavity, the free end of the first buffer spring is fixedly connected with the tail end of the piston rod, the top of the left end of the second cylinder barrel is provided with an annular hole, a second buffer spring is fixed in the annular hole, the free end of the second buffer spring is fixedly connected with a buffer plate, a third buffer spring is fixed at the right end of the end cover, the free end of the third buffer spring is fixedly connected with the piston, and the, open on the end cover and have first orifice, second cylinder left end top is opened has the second orifice, through first adjustable throttle valve pipe connection between first orifice and the second orifice, parallelly connected there is first check valve between the first adjustable throttle valve, it has the third orifice to open on the base, through second adjustable throttle valve pipe connection between first orifice and the third orifice, second adjustable throttle valve both ends are parallelly connected there is the second check valve.

And two ends of the bottom of the cylinder barrel are respectively connected with a supplementary oil inlet duct.

The right end of the piston is provided with an arc-shaped groove.

An arc-shaped bulge is arranged in the buffer cavity.

The left end of the piston rod is sleeved with a sheath, and the sheath consists of a wear-resistant rubber layer and an elastic rubber layer.

The buffer plate is of an annular plate-shaped structure and is correspondingly matched with the annular hole.

The invention has the beneficial effects that:

1. the movement of the piston is buffered through the combined action of the first buffer spring, the second buffer spring and the throttling, so that the running speed of the piston is reduced before the piston runs to a dead point, the impact noise in running is reduced, the equipment failure caused by mechanical impact is avoided, the reliability of the equipment is improved, and the service life of the equipment is prolonged;

2. the piston rod is reset through the rebounding of the first buffer spring and the second buffer spring and the retraction of the third buffer spring, and the third buffer spring also has a buffer effect on the end cover;

3. the flow rate of the hydraulic oil between the third throttling hole and the first throttling hole can be adjusted through the first adjustable throttling valve, and the flow rate of the hydraulic oil between the second throttling hole and the first throttling hole can be adjusted through the second adjustable throttling valve, so that the operation speed of each stage of the piston rod can be adjusted.

Drawings

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

In the figure: 1. the cylinder, 2, the end cover, 3, the base, 4, the piston rod, 5, the piston, 6, the uide bushing, 7, first cylinder, 8, the second cylinder, 9, the cushion chamber, 10, first buffer spring, 11, the annular space, 12, the second buffer spring, 13, the buffer board, 14, the third buffer spring, 15, first orifice, 16, the second orifice, 17, the third orifice, 18, the second adjustable throttle valve, 19, the second check valve, 20, the sheath, 21, make-up oil inlet duct, 22, the first adjustable throttle valve, 23, first check valve.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

referring to fig. 1, a buffering pneumatic cylinder, including cylinder 1, end cover 2 and base 3 are installed respectively at both ends about cylinder 1, are equipped with piston rod 4, its characterized in that in cylinder 1: the piston rod 4 is sleeved with a piston 5 and a guide sleeve 6, the cylinder barrel 1 comprises a first cylinder barrel 7 and a second cylinder barrel 8, the piston 5 is in sealing fit with the first cylinder barrel 7, the guide sleeve 5 is in sealing fit with the second cylinder barrel 8, the middle part of the base 3 is provided with a buffer chamber 9, a first buffer spring 10 is fixed in the buffer chamber 9, the free end of the first buffer spring 10 is fixedly connected with the tail end of the piston rod 4, the top part of the left end of the second cylinder barrel 8 is provided with an annular hole 11, a second buffer spring 12 is fixed in the annular hole 11, the free end of the second buffer spring 12 is fixedly connected with a buffer plate 13, the right end of the end cover 2 is fixed with a third buffer spring 14, the free end of the third buffer spring 14 is fixedly connected with the piston 5, the third buffer spring 14 is sleeved outside the piston rod 4, the end cover 2 is provided with a first orifice 15, the top part of the left end of the second cylinder barrel 8 is provided with a second orifice 16, the first orifice 15, a first check valve 23 is connected in parallel between the first adjustable throttle valves 22, a third throttling hole 17 is formed in the base 3, the first throttling hole 15 and the third throttling hole 17 are connected through a second adjustable throttle valve 18 through a pipeline, and second check valves 19 are connected in parallel at two ends of the second adjustable throttle valve 18.

Two ends of the bottom of the cylinder barrel 1 are respectively connected with a supplementary oil inlet duct 21.

The right end of the piston 5 is provided with an arc-shaped groove, so that the contact area between the piston 5 and hydraulic oil at the right end of the piston is increased, the running resistance of the piston 5 is increased when the piston rod 4 is subjected to external force, and meanwhile, the piston 5 impacts the hydraulic oil at the right end, so that the hydraulic oil at the right end of the piston 5 moves towards the first throttling hole 15 through the second throttling hole 16.

The inside arc arch that is equipped with of cushion chamber 9 can transmit the impact force dispersion that the cushion chamber 9 bottom received to the outside, avoids cushion chamber 9 bottom impaired.

The left end of the piston rod 4 is sleeved with a sheath 20, and the sheath 20 consists of a wear-resistant rubber layer and an elastic rubber layer and plays a role in protecting the piston rod.

The buffer plate 13 is of an annular plate-shaped structure, the buffer plate 13 is correspondingly matched with the annular hole 11, and the buffer plate 13 can move in the hydraulic cylinder 1.

When the piston rod moves to the bottom of the cylinder under the action of external force, the first buffer spring has a buffer effect on the piston rod, the third buffer spring has a stretching effect on the piston rod, and hydraulic oil flows to the first throttle hole from the second throttle hole to buffer the movement of the piston;

when the guide sleeve on the piston rod enters the second cylinder barrel, the first buffer spring has a buffer effect on the piston rod, the third buffer spring has a stretching effect on the piston rod, and hydraulic oil flows to the first throttle hole from the second throttle hole and the third throttle hole respectively to buffer the movement of the piston;

when the piston rod moves to the buffer plate, the first buffer spring has a buffer effect on the piston rod, the third buffer spring has a stretching effect on the piston rod, hydraulic oil flows to the first throttle hole through the second throttle hole and the third throttle hole respectively to buffer the movement of the piston, and the buffer plate and the second buffer spring have a buffer effect on the piston rod;

then, the piston rod moves reversely under the rebounding action of the first buffer spring and the second buffer spring and the stretching action of the third buffer spring, hydraulic oil flows from the first throttle hole to the second throttle hole and the third throttle hole respectively, and the third spring can prevent the piston from impacting the end cover.

Claims

1. The utility model provides a buffering hydraulic cylinder, includes cylinder (1), end cover (2) and base (3) are installed respectively to both ends about cylinder (1), be equipped with piston rod (4), its characterized in that in cylinder (1): the piston rod (4) is sleeved with a piston (5) and a guide sleeve (6), the cylinder (1) comprises a first cylinder (7) and a second cylinder (8), the piston (5) is in sealing fit with the first cylinder (7), the guide sleeve (5) is in sealing fit with the second cylinder (8), the middle of the base (3) is provided with a buffer cavity (9), a first buffer spring (10) is fixed in the buffer cavity (9), the free end of the first buffer spring (10) is fixedly connected with the tail end of the piston rod (4), the top of the left end of the second cylinder (8) is provided with an annular hole (11), a second buffer spring (12) is fixed in the annular hole (11), the free end of the second buffer spring (12) is fixedly connected with a buffer plate (13), the right end of the end cover (2) is fixed with a third buffer spring (14), and the free end of the third buffer spring (14) is fixedly connected with the piston (5), third buffer spring (14) suit in the piston rod (4) outside, it has first orifice (15) to open on end cover (2), second cylinder (8) left end top is opened and is had second orifice (16), through first adjustable throttle valve (22) pipe connection between first orifice (15) and second orifice (16), parallelly connected have first check valve (23) between first adjustable throttle valve (22), it has third orifice (17) to open on base (3), through second adjustable throttle valve (18) pipe connection between first orifice (15) and third orifice (17), second adjustable throttle valve (18) both ends parallelly connected have second check valve (19).

2. A damping cylinder according to claim 1, characterized in that: and two ends of the bottom of the cylinder barrel (1) are respectively connected with a supplementary oil inlet duct (21).

3. A damping cylinder according to claim 1, characterized in that: the right end of the piston (5) is provided with an arc-shaped groove.

4. A damping cylinder according to claim 1, characterized in that: an arc-shaped bulge is arranged in the buffer cavity (9).

5. A damping cylinder according to claim 1, characterized in that: the left end of the piston rod (4) is sleeved with a sheath (20), and the sheath (20) consists of a wear-resistant rubber layer and an elastic rubber layer.

6. A damping cylinder according to claim 1, characterized in that: the buffer plate (13) is of an annular plate-shaped structure, and the buffer plate (13) is correspondingly matched with the annular hole (11).