CN212959358U

CN212959358U - Hydraulic cylinder

Info

Publication number: CN212959358U
Application number: CN202021868869.5U
Authority: CN
Inventors: 满梦
Original assignee: Xuzhou Daman Hydraulic Machinery Co Ltd
Current assignee: Xuzhou Daman Hydraulic Machinery Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-04-13
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a hydraulic cylinder, including cylinder, set up first oilhole and second oilhole at cylinder lateral wall both ends, slidable mounting first piston in the cylinder, set up first piston rod in first piston, slidable mounting second piston in first piston, set up the one end of keeping away from first oilhole on the second piston and the second piston rod and the heat abstractor of circumference evenly arranging on the cylinder outer wall of slidable mounting in first piston rod. The utility model can prolong the stroke of the hydraulic cylinder by arranging the second piston rod in the first piston rod, and increase the stroke of the hydraulic cylinder under the condition of a certain length of the cylinder barrel; the extension spring and the compression spring are arranged, so that the second piston rod can be conveniently retracted; through set up a plurality of heat abstractor at the cylinder surface, heat transfer through the heat pipe in the heat abstractor can effectively improve pneumatic cylinder radiating efficiency, guarantees at the operating temperature of pneumatic cylinder, increase of service life.

Description

Hydraulic cylinder

Technical Field

The utility model relates to a hydraulic cylinder belongs to pneumatic cylinder technical field.

Background

The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating 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. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device. The damping device and the exhaust device are determined according to specific application occasions, and other devices are necessary.

The pneumatic cylinder has the short problem of stroke in the use to the pneumatic cylinder is inside piston round trip movement production heat, and the leakproofness of pneumatic cylinder can be damaged in the overheated pneumatic cylinder, influences the life of pneumatic cylinder.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides a hydraulic cylinder, which can prolong the stroke of the hydraulic cylinder by arranging a second piston rod in a first piston rod, and increase the stroke of the hydraulic cylinder under the condition of a certain length of a cylinder barrel; the extension spring and the compression spring are arranged, so that the second piston rod can be conveniently retracted; through set up a plurality of heat abstractor at the cylinder surface, heat transfer through the heat pipe in the heat abstractor can effectively improve pneumatic cylinder radiating efficiency, guarantees at the operating temperature of pneumatic cylinder, increase of service life.

In order to achieve the purpose, the hydraulic cylinder comprises a cylinder barrel, a first oil hole and a second oil hole which are arranged at two ends of the side wall of the cylinder barrel, a first piston which is arranged in the cylinder barrel in a sliding way, a first piston rod which is arranged at one end of the first piston far away from the first oil hole, a second piston which is arranged in the first piston in a sliding way, a second piston rod which is arranged at one end of the second piston far away from the first oil hole and is arranged in the first piston rod in a sliding way, and a heat dissipation device which is uniformly arranged on the outer wall of the cylinder barrel in the circumferential direction, wherein a plurality of sealing rings are arranged on the outer wall of the first piston, the first piston rod penetrates through a guide sleeve at one end of the cylinder barrel and a cylinder cover, a through hole is radially arranged at the circle center of the first piston and the first piston rod, the second piston is connected with the inner wall of the through hole in a sliding way, a, the heat dissipation device comprises T-shaped heat dissipation fins and U-shaped heat pipes installed in the heat dissipation fins, wherein a plurality of through grooves are formed in the heat dissipation fins, and the heat dissipation fins are fixed on the outer wall of the cylinder barrel through fixing rings penetrating through the through grooves.

Preferably, one end of the first piston rod, which is far away from the first piston, is provided with a sealing ring.

Preferably, a threaded hole is formed in one end, far away from the first oil hole, of the second piston rod, and a screw rod is installed in the threaded hole.

Preferably, a plurality of radially extending grooves are uniformly arranged on the outer wall of the cylinder barrel in the circumferential direction, and the T-shaped bottoms of the radiating fins are clamped in the grooves.

Preferably, heat-conducting silicone grease is smeared between the T-shaped bottom of the heat dissipation fin and the outer wall of the cylinder barrel.

Preferably, the outer wall of the heat dissipation fin is provided with a plurality of heat dissipation grooves.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the second piston rod is arranged in the first piston rod, so that the stroke of the hydraulic cylinder can be prolonged, and the stroke of the hydraulic cylinder is increased under the condition that the length of the cylinder barrel is fixed;

2. the extension spring and the compression spring are arranged, so that the second piston rod can be conveniently retracted;

3. through set up a plurality of heat abstractor at the cylinder surface, heat transfer through the heat pipe in the heat abstractor can effectively improve pneumatic cylinder radiating efficiency, guarantees at the operating temperature of pneumatic cylinder, increase of service life.

Drawings

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

FIG. 2 is a schematic structural view of the cylinder barrel of the present invention;

fig. 3 is a cross-sectional view of the present invention;

fig. 4 is a schematic structural diagram of the heat dissipation device of the present invention.

In the figure: 1. the heat pipe cooling device comprises a cylinder barrel, 2, a first oil hole, 3, a second oil hole, 4, a first piston rod, 5, a second piston rod, 6, a screw rod, 7, a heat dissipation device, 7-1, heat dissipation fins, 7-2, a heat pipe, 8, a fixing ring, 9, a first piston, 10, a second piston, 11, an extension spring, 12 and a compression spring.

Detailed Description

The technical solutions in the implementation of the present invention will be clear from the following description and accompanying drawings, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 4, a hydraulic cylinder provided in an embodiment of the present invention includes a cylinder barrel 1, a first oil hole 2 and a second oil hole 3 disposed at two ends of a side wall of the cylinder barrel 1, a first piston 9 slidably mounted in the cylinder barrel 1, a first piston rod 4 disposed at an end of the first piston 9 far from the first oil hole 2, a second piston 10 slidably mounted in the first piston 9, a second piston rod 5 disposed at an end of the second piston 10 far from the first oil hole 2 and slidably mounted in the first piston rod 4, and a heat dissipation device 7 uniformly circumferentially disposed on an outer wall of the cylinder barrel 1, wherein a plurality of sealing rings are disposed on the outer wall of the first piston 9, the first piston rod 4 passes through a guide sleeve and a cylinder cover at one end of the cylinder barrel 1, a through hole is radially disposed at a center of the first piston 9 and the first piston rod 4, the second piston 10 is slidably connected to an inner wall of the through hole, the outer wall of the second piston 10 is provided with a plurality of sealing rings, an extension spring 11 is arranged between one end of the second piston 10 close to the first oil hole 2 and the bottom wall of the cylinder barrel 1, a compression spring 12 is arranged between one end of the second piston 10 far away from the first oil hole 2 and the inner wall of one end of the first piston rod 4 far away from the first oil hole 2, the second piston rod 5 penetrates through the compression spring 12, the heat dissipation device 7 comprises a T-shaped heat dissipation fin 7-1 and a U-shaped heat pipe 7-2 installed in the heat dissipation fin 7-1, the heat dissipation fin 7-1 is provided with a plurality of through grooves, and the heat dissipation fin 7-1 is fixed on the outer wall of the cylinder barrel 1 through a fixing ring 8 penetrating through the through grooves.

Preferably, the end of the first piston rod 4 remote from the first piston 9 is provided with a sealing ring. The sealing performance is enhanced.

Preferably, a threaded hole is opened at one end of the second piston rod 5 away from the first oil hole 2, and a screw 6 is installed in the threaded hole. The length of the second piston rod 5 is prolonged, so that the novel piston rod is suitable for more application ranges.

Preferably, a plurality of radially extending grooves are uniformly arranged on the outer wall of the cylinder barrel 1 in the circumferential direction, and the T-shaped bottoms of the heat dissipation fins 7-1 are clamped in the grooves. The contact area is increased, and the heat conduction effect is improved.

Preferably, heat-conducting silicone grease is coated between the T-shaped bottom of the heat dissipation fin 7-1 and the outer wall of the cylinder barrel 1. The heat conduction effect is enhanced.

Preferably, the outer wall of the heat dissipation fin 7-1 is provided with a plurality of heat dissipation grooves. The heat dissipation effect is enhanced.

The working process is as follows: hydraulic oil enters the cylinder barrel 1 from the first oil hole 2, the hydraulic oil is discharged from the second oil hole 3, the first piston 9 is pushed to move towards the second oil hole 3, meanwhile, the second piston 10 is pushed to move in the same direction, the first piston rod 4 is pushed out of the cylinder barrel 1, and the second piston rod 5 is pushed out of the first piston rod. When hydraulic oil enters from the second oil hole 3 and is discharged from the first oil hole 2, the hydraulic oil pushes the first piston 9 to move towards the first oil hole 2, the first oil hole 2 simultaneously pumps out the hydraulic oil under the pushing of the hydraulic oil, and the second piston rod 5 retracts into the first piston rod 4 under the action of the extension spring 11 and the compression spring 12. The heat generated in the cylinder barrel 1 is conducted to the radiating fins 7-1 through the heat pipe 7-2 and then conducted to the air.

To sum up, the utility model can extend the stroke of the hydraulic cylinder by arranging the second piston rod 5 in the first piston rod 4, and the stroke of the hydraulic cylinder is increased under the condition that the length of the cylinder barrel 1 is fixed; by providing the extension spring 11 and the compression spring 12, the retraction of the second piston rod 5 can be facilitated; through set up a plurality of heat abstractor 7 at cylinder 1 surface, heat pipe through the heat abstractor 7 is interior conducts heat, can effectively improve pneumatic cylinder radiating efficiency, guarantees at the operating temperature of pneumatic cylinder, increase of service life.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.

Claims

1. A hydraulic cylinder is characterized by comprising a cylinder barrel (1), a first oil hole (2) and a second oil hole (3) which are arranged at two ends of the side wall of the cylinder barrel (1), a first piston (9) which is slidably arranged in the cylinder barrel (1), a first piston rod (4) which is arranged at one end of the first piston (9) far away from the first oil hole (2), a second piston (10) which is slidably arranged in the first piston (9), a second piston rod (5) which is arranged at one end of the second piston (10) far away from the first oil hole (2) and is slidably arranged in the first piston rod (4), and heat dissipation devices (7) which are uniformly arranged on the outer wall of the cylinder barrel (1) in the circumferential direction, wherein a plurality of sealing rings are arranged on the outer wall of the first piston (9), the first piston rod (4) penetrates through a guide sleeve and a cylinder cover at one end of the cylinder barrel (1), and through holes are radially formed in the circle centers of the first piston (9) and the first piston, the second piston (10) is connected with the inner wall of the through hole in a sliding way, a plurality of sealing rings are arranged on the outer wall of the second piston (10), an extension spring (11) is arranged between one end of the second piston (10) close to the first oil hole (2) and the bottom wall of the cylinder barrel (1), a compression spring (12) is arranged between one end of the second piston (10) far away from the first oil hole (2) and the inner wall of one end of the first piston rod (4) far away from the first oil hole (2), the second piston rod (5) penetrates through the compression spring (12), the heat dissipation device (7) comprises T-shaped heat dissipation fins (7-1) and U-shaped heat pipes (7-2) arranged in the heat dissipation fins (7-1), the heat dissipation fins (7-1) are provided with a plurality of through grooves, and the heat dissipation fins (7-1) are fixed on the outer wall of the cylinder barrel (1) through fixing rings (8) penetrating through the through grooves.

2. A hydraulic cylinder according to claim 1, characterized in that the end of the first piston rod (4) remote from the first piston (9) is provided with a sealing ring.

3. A hydraulic cylinder according to claim 1, characterized in that the end of the second piston rod (5) remote from the first oil bore (2) is threaded and a threaded rod (6) is mounted in the threaded bore.

4. A hydraulic cylinder according to claim 1, characterized in that a plurality of radially extending grooves are evenly arranged in the circumferential direction on the outer wall of the cylinder barrel (1), and the T-shaped bottoms of the heat dissipating fins (7-1) are engaged in the grooves.

5. A hydraulic cylinder according to claim 4, characterized in that a heat-conducting silicone grease is applied between the T-shaped bottom of the heat sink fins (7-1) and the outer wall of the cylinder tube (1).

6. A hydraulic cylinder according to claim 1, characterized in that the outer wall of the heat sink fins (7-1) is provided with a plurality of heat sink grooves.