CN219975008U

CN219975008U - Variable-speed buffer hydraulic cylinder

Info

Publication number: CN219975008U
Application number: CN202321385365.1U
Authority: CN
Inventors: 陈晨; 施春花
Original assignee: Changzhou Li'an Hydraulic Equipment Co ltd
Current assignee: Changzhou Li'an Hydraulic Equipment Co ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2023-11-07
Anticipated expiration: 2033-06-02

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a speed-changing buffer hydraulic cylinder which comprises a cylinder barrel, a front cylinder cover and a rear cylinder cover, wherein a piston and a piston rod are arranged in the cylinder barrel, one end of the piston rod penetrates through the front cylinder cover and extends out of the cylinder barrel, a first oil port is formed in the rear cylinder cover, a second oil port is formed in the side wall of the cylinder barrel and close to the front cylinder cover, the piston rod comprises an outer rod body and an inner rod body, a drawing port which is axially distributed is formed in one end of the outer rod body, one end of the inner rod body is fixedly connected with the piston, and the other end of the inner rod body is inserted into the drawing port and sleeved with a piston sheet. The piston rod comprises the outer rod body and the inner rod body, and when hydraulic oil enters the cylinder barrel from the first oil port and the third oil port respectively, the ejection speed of the piston rod is different, so that the piston rod can be suitable for different application occasions.

Description

Variable-speed buffer hydraulic cylinder

Technical Field

The utility model relates to the technical field of hydraulic cylinders, in particular to a variable-speed buffer hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion. The hydraulic system is simple in structure and reliable in operation, and is widely applied to hydraulic systems of various machines.

The traditional hydraulic cylinder comprises a cylinder barrel, a front cylinder cover, a rear cylinder cover, a piston rod, a sealing mechanism and other structures, and a plurality of oil ports are formed in the cylinder barrel or the cylinder cover, and the reciprocating motion of the piston rod is realized through oil inlet and outlet of the oil ports. However, when hydraulic oil enters the cylinder at a constant speed, the ejection speed of the piston rod of the traditional hydraulic cylinder is constant, if the ejection speed of the piston rod needs to be increased, the pumping speed of the hydraulic oil needs to be increased, so that the power of the hydraulic system tends to be increased, which is not beneficial to energy conservation.

In the prior art, the utility model patent with publication number of CN208364520U provides a simple adjustable speed-changing oil cylinder, which specifically comprises a cylinder barrel, a front end cover, a rear end cover, a piston rod and other structures, wherein the front end cover and the rear end cover are respectively provided with two oil ports. According to the technical scheme, the number of the oil inlets is changed to change the ejection speed of the piston rod, and although the ejection speed of the piston rod can be improved, the pumping speed of hydraulic oil is required to be increased, namely, the power of a hydraulic system is improved, and the energy consumption is increased.

Disclosure of Invention

The utility model aims to provide a speed-changing buffer hydraulic cylinder which is used for solving the problems in the background technology.

The utility model is realized by the following technical scheme:

the utility model provides a variable speed buffering hydraulic cylinder, includes cylinder, preceding cylinder cap and back cylinder cap, the inside of cylinder is equipped with piston and piston rod, the one end of piston rod passes preceding cylinder cap and stretches out to the outside of cylinder, be equipped with first hydraulic fluid port on the back cylinder cap, the position department that just is close to preceding cylinder cap on the lateral wall of cylinder is equipped with the second hydraulic fluid port, the piston rod includes outer body of rod and interior body of rod, the outer body of rod is located the inside one end of cylinder and has offered the pull mouth that distributes along the axial, the one end and the piston fixed connection of interior body of rod, the other end of interior body of rod inserts in the pull mouth and the cover is equipped with the piston piece; the side wall of the cylinder barrel and the position close to the rear cylinder cover are provided with a third oil port, the inner rod body is further provided with an oil supply channel, the piston is provided with an oil inlet communicated with the oil supply channel, and when the piston is abutted to the inner end of the rear cylinder cover, the oil inlet is communicated with the third oil port.

Optionally, the fixed cover of one end of outer body of rod towards the back cylinder cap is equipped with annular flange, the outside of outer body of rod still overlaps and is equipped with reset spring, reset spring's both ends respectively with annular flange and the inner butt of preceding cylinder cap, under the natural state, reset spring is in compression state.

Optionally, sealing rings are sleeved on the front side and the rear side of the outer part of the piston, and the oil inlet is positioned between the two sealing rings.

Optionally, the one end coaxial coupling that the outer body of rod stretches out to the cylinder outside has the sliding sleeve, the inside activity of sliding sleeve is inserted and is equipped with the displacement post, the one end of displacement post stretches out to outside the sliding sleeve and be equipped with the go-between.

Optionally, the outside cover of displacement post is equipped with buffer spring, buffer spring's both ends respectively with the outer terminal surface of sliding sleeve and go-between butt, under the natural state, buffer spring is compression state.

Compared with the prior art, the utility model provides a speed-changing buffer hydraulic cylinder, which comprises the following components

The beneficial effects are that:

1. when hydraulic oil enters the cylinder barrel from the first oil port and the third oil port respectively, the ejection speed of the piston rod is different, so that the piston rod can be suitable for different application occasions;

2. the front end of the piston rod is also provided with the sliding sleeve and the displacement column, and the displacement column is elastically connected in the sliding sleeve through the buffer spring, so that the piston rod can play a role in buffering, and rigid collision with external functions is avoided.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of a piston rod according to the present utility model;

fig. 3 is an enlarged schematic view of fig. 1 at a.

In the figure: 100. a cylinder; 101. a front cylinder cover; 102. a rear cylinder cover; 103. a first oil port; 104. a second oil port; 105. a third oil port; 200. a piston; 201. an oil inlet; 202. a seal ring; 300. a piston rod; 301. an outer rod body; 302. an inner rod body; 303. a drawing port; 304. a piston plate; 305. an oil supply passage; 306. an annular flange; 307. a sliding sleeve; 308. a displacement column; 309. a connecting ring; 400. a return spring; 500. and a buffer spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples: referring to fig. 1-3, a variable speed buffer hydraulic cylinder comprises a cylinder barrel 100, a front cylinder cover 101 and a rear cylinder cover 102, wherein a piston 200 and a piston rod 300 are arranged in the cylinder barrel 100, one end of the piston rod 300 passes through the front cylinder cover 101 and extends out of the cylinder barrel 100, a first oil port 103 is arranged on the rear cylinder cover 102, a second oil port 104 is arranged on the side wall of the cylinder barrel 100 and near the front cylinder cover 101, the piston rod 300 comprises an outer rod body 301 and an inner rod body 302, a drawing port 303 which is axially distributed is formed in one end of the outer rod body 301 in the cylinder barrel 100, one end of the inner rod body 302 is fixedly connected with the piston 200, and the other end of the inner rod body 302 is inserted into the drawing port 303 and sleeved with a piston sheet 304; specifically, the drawing port 303 and the outer rod 301 are coaxially disposed, and the inner rod 302 is movably inserted into the drawing port 303, so that the outer rod 301 and the inner rod 302 can slide relatively.

Further, a third oil port 105 is arranged on the side wall of the cylinder barrel 100 and near the rear cylinder cover 102, an oil supply channel 305 is further arranged on the inner rod body 302, an oil inlet 201 communicated with the oil supply channel 305 is arranged on the piston 200, and when the piston 200 is abutted against the inner end of the rear cylinder cover 102, the oil inlet 201 is communicated with the third oil port 105; one end of the oil supply channel 305 is flush with the free end of the inner rod body 302, and the inner rod body 302 is fixed to penetrate the piston 200, when the oil inlet 201 and the third oil port 105 are aligned and communicated, the oil can be shared into the drawing port 303 through the third oil port 105, so that the outer rod body 301 is pushed out, and because the inner space of the drawing port 303 is narrow, when hydraulic oil enters the interior of the drawing port 303 at a constant speed, the outer rod body 301 can be pushed out quickly.

In addition, an annular flange 306 is fixedly sleeved at one end of the outer rod body 301 facing the rear cylinder cover 102, a return spring 400 is sleeved outside the outer rod body 301, two ends of the return spring 400 are respectively abutted with the annular flange 306 and the inner end of the front cylinder cover 101, and the return spring 400 is in a compressed state in a natural state; since the return spring 400 is in a compressed state, the return spring 400 always has an inward pushing force on the outer rod 301, and when the third oil port 105 stops oil supply and opens a valve in the oil supply system, the outer rod 301 can be pushed back to the original position due to the pushing force of the return spring 400. Moreover, the sealing rings 202 are sleeved on the front side and the rear side of the outer portion of the piston 200, and the oil inlet 201 is located between the two sealing rings 202, so that the oil inlet 201 can be communicated with the outside only when being aligned and communicated with the third oil port 105, and in other states, the oil inlet 201 is not in contact with the outside.

It should be noted that, one end of the outer rod 301 extending to the outside of the cylinder barrel 100 is coaxially connected with a sliding sleeve 307, a displacement column 308 is movably inserted in the sliding sleeve 307, one end of the displacement column 308 extends to the outside of the sliding sleeve 307 and is provided with a connecting ring 309, a buffer spring 500 is sleeved outside the displacement column 308, two ends of the buffer spring 500 are respectively abutted with the outer end face of the sliding sleeve 307 and the connecting ring 309, and in a natural state, the buffer spring 500 is in a compressed state; as shown in fig. 2, the displacement column 308 is elastically connected in the sliding sleeve 307, so that when the connecting ring 309 collides with external foreign matter, the connecting ring 309 can be prevented from rigidly colliding with the external foreign matter due to the buffer spring 500.

In summary, in the conventional usage state, the third oil port 105 is in a closed state, and at this time, only the first oil port 103 and the second oil port 104 are in a working state, and when the piston rod 300 needs to be extended, the first oil port 103 is used for oil feeding, and the second oil port 104 is used for oil discharging; when the piston rod 300 needs to be retracted, the second oil port 104 is used for oil feeding, and the first oil port 103 is used for oil discharging; when the extension speed of the piston rod 300 needs to be increased, the piston 200 is first retracted to be abutted against the rear cylinder cover 102, at this time, the third oil port 105 is communicated with the oil inlet 201, and oil is supplied by the third oil port 105, so that hydraulic oil enters the drawing port 303 to rapidly push out the outer rod body 301; when the third oil port 105 stops oil supply and a valve in the oil supply system is opened, the outer rod 301 can be automatically reset under the action of the reset spring 400.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a variable speed buffering hydraulic cylinder, includes cylinder (100), preceding cylinder cap (101) and back cylinder cap (102), the inside of cylinder (100) is equipped with piston (200) and piston rod (300), the one end of piston rod (300) passes preceding cylinder cap (101) and stretches out to the outside of cylinder (100), be equipped with first hydraulic fluid port (103) on back cylinder cap (102), be equipped with second hydraulic fluid port (104) on the lateral wall of cylinder (100) and be close to the position department of preceding cylinder cap (101), its characterized in that:

the piston rod (300) comprises an outer rod body (301) and an inner rod body (302), wherein one end of the outer rod body (301) positioned in the cylinder barrel (100) is provided with a drawing port (303) distributed along the axial direction, one end of the inner rod body (302) is fixedly connected with the piston (200), and the other end of the inner rod body (302) is inserted into the drawing port (303) and sleeved with a piston sheet (304);

the side wall of the cylinder barrel (100) is provided with a third oil port (105) at a position close to the rear cylinder cover (102), an oil supply channel (305) is further formed in the inner rod body (302), an oil inlet (201) communicated with the oil supply channel (305) is formed in the piston (200), and when the piston (200) is in butt joint with the inner end of the rear cylinder cover (102), the oil inlet (201) is communicated with the third oil port (105).

2. The shift shock absorber hydraulic cylinder as defined in claim 1, wherein: the outer rod body (301) is fixedly sleeved with an annular flange (306) towards one end of the rear cylinder cover (102), a reset spring (400) is sleeved outside the outer rod body (301), two ends of the reset spring (400) are respectively abutted with the annular flange (306) and the inner end of the front cylinder cover (101), and in a natural state, the reset spring (400) is in a compressed state.

3. The shift shock absorber hydraulic cylinder as defined in claim 1, wherein: sealing rings (202) are sleeved on the front side and the rear side of the outer portion of the piston (200), and the oil inlet (201) is located between the two sealing rings (202).

4. The shift shock absorber hydraulic cylinder as defined in claim 1, wherein: one end of the outer rod body (301) extending out of the cylinder barrel (100) is coaxially connected with a sliding sleeve (307), a displacement column (308) is movably inserted in the sliding sleeve (307), and one end of the displacement column (308) extends out of the sliding sleeve (307) and is provided with a connecting ring (309).

5. The shift shock absorber hydraulic cylinder as defined in claim 4, wherein: the outside cover of displacement post (308) is equipped with buffer spring (500), buffer spring (500) both ends respectively with the outer terminal surface of sliding sleeve (307) and go-between (309) butt, in the natural state, buffer spring (500) are compressed state.