CN214837482U

CN214837482U - Rear buffer hydraulic cylinder

Info

Publication number: CN214837482U
Application number: CN202120676282.2U
Authority: CN
Inventors: 王军
Original assignee: Anhui Fuqi Hydraulic Technology Co ltd
Current assignee: Anhui Fuqi Hydraulic Technology Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-11-23
Anticipated expiration: 2031-04-01

Abstract

The utility model provides a back damping hydraulic cylinder, including cylinder body and piston rod. The piston rod is positioned in the cylinder body, one end of the cylinder body is provided with a guide sleeve, and the piston rod is sleeved on the guide sleeve in a sliding manner; a dust ring is arranged at the sliding sleeve joint of the piston rod and the guide sleeve, and a U-shaped sealing ring I is arranged on the side of the dust ring; a steel back bearing is arranged at the contact part of the cylinder body and the piston rod, and the contact part of the steel back bearing and the guide sleeve is sealed by an O-shaped sealing ring; the rear buffer hydraulic cylinder further comprises a piston assembly, the piston assembly is arranged inside the cylinder body, a support ring is sleeved between the piston assembly and the cylinder body, and the support ring and the cylinder body are sealed and fixed through a U-shaped sealing ring II. The piston assembly is designed in the hydraulic cylinder, the piston assembly forms a corresponding piston buffer cavity, the piston rod is inserted into the corresponding piston buffer cavity, and when the piston rod moves in a return stroke, hydraulic oil in the piston buffer cavity is compressed and flows back through an oil duct with a smaller cross section area, so that hydraulic damping is formed on the piston rod piece, and a good buffering effect is achieved.

Description

Rear buffer hydraulic cylinder

Technical Field

The utility model belongs to the technical field of hydraulic equipment, specifically be a back buffering pneumatic cylinder.

Background

In the case of hydraulic cylinders, in particular double-acting hydraulic cylinders, the speed is generally high during the return stroke under the condition of rapid operation, so that a damping device is required to be arranged at the stroke end. However, the damping effect at the end of the stroke is not always satisfactory due to the restriction of the internal space of the hydraulic cylinder. Especially, when the hydraulic cylinder drives a load with large mass, the kinetic energy is overlarge, so that the phenomenon of violent impact among the piston, the cylinder bottom and the guide sleeve can be generated at the tail end of the stroke, and the normal service life and the precision of the hydraulic cylinder are greatly influenced.

SUMMERY OF THE UTILITY MODEL

Problem to current technical scheme existence, the utility model aims at providing a back cushion hydraulic cylinder.

In order to achieve the above object, the utility model provides a following technical scheme:

a damping cylinder, comprising:

a cylinder body;

a piston rod;

the piston rod is positioned in the cylinder body, one end of the cylinder body is provided with a guide sleeve, and the piston rod is sleeved on the guide sleeve in a sliding manner; a dust ring is arranged at the sliding sleeve joint of the piston rod and the guide sleeve, and a U-shaped sealing ring I is arranged on the side of the dust ring; a steel back bearing is arranged at the contact part of the cylinder body and the piston rod, and the contact part of the steel back bearing and the guide sleeve is sealed by an O-shaped sealing ring;

the rear buffer hydraulic cylinder also comprises a piston assembly, the piston assembly is arranged in the cylinder body, and a spring is wound on the piston assembly; and a support ring is sleeved between the piston assembly and the cylinder body, and the support ring and the cylinder body are sealed and fixed through a U-shaped seal ring II.

As a further improvement of the scheme, a separation blade is arranged at the contact part of the first U-shaped sealing ring and the piston rod.

As a further improvement of the scheme, separation blades are arranged at the fixed sealing positions of the U-shaped sealing ring II and the piston assembly.

As a further improvement of the scheme, the piston rod and the piston assembly are fixed in the cylinder body through a pin in an integrated mode.

As a further improvement of the scheme, the cylinder body is a hollow cylinder, and the inner diameter of the base circle of the cylinder body is 45 mm.

As a further improvement of the present solution, the diameter of the piston rod is 36 mm.

As a further improvement of the scheme, the cylinder body surface is sprayed with matt gray PANTONE432 acrylic polyurethane enamel, and the glossiness is 40%.

As a further improvement of this aspect, the entire rear cushion hydraulic cylinder is 1400 mm.

Compared with the prior art, the beneficial effects of the utility model are that: the piston assembly is arranged at the bottom of the cylinder body, the structure is simple, the buffering effect can be achieved, and the large weight burden can not be brought to the hydraulic cylinder; by combining the U-shaped sealing ring and the O-shaped sealing ring, in the moving process of the hydraulic cylinder, the pressure applied to the U-shaped sealing ring is further transmitted to the O-shaped sealing ring, and the O-shaped sealing ring converts the maximum pressure point to the edge of the sealing ring, so that good sealing is realized; through setting up the dirt proof boot, can avoid the problem of the sealed failure that produces because of the dust gets into along with the motion of piston rod.

The rear end of the hydraulic cylinder is provided with the piston assembly, the piston assembly forms a piston buffer cavity, so that in the return stroke moving process of the piston rod piece, the piston rod can be inserted into the corresponding piston buffer cavity to cut off the oil in the piston buffer cavity once, and when the piston rod continues to move in the return stroke, the hydraulic oil in the piston buffer cavity is compressed and flows back through the oil duct with the smaller cross section area, so that hydraulic damping is formed on the piston rod piece, and a good buffering effect is achieved.

Drawings

The present invention will be further explained with reference to the accompanying drawings.

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

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1 according to the present invention;

fig. 3 is an enlarged schematic view of the structure at B in fig. 1 according to the present invention.

The figure is marked with: 1-a dustproof ring, 2-a U-shaped seal ring I, 3-a guide sleeve, 4-an O-shaped seal ring, 5-a steel back bearing, 6-a cylinder body, 7-a piston rod, 8-a steel wire retainer ring, 9-a piston assembly, 10-a support ring, 11-a U-shaped seal ring II and 12-a pin.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the rear cushion hydraulic cylinder of the present embodiment includes a cylinder body 6 and a piston rod 7;

the piston rod 7 is positioned in the cylinder body 6, one end of the cylinder body 6 is provided with the guide sleeve 3, and the piston rod 7 is sleeved on the guide sleeve 3 in a sliding manner; a dust ring 1 is arranged at the sliding sleeve joint of the piston rod 7 and the guide sleeve 3, and a U-shaped sealing ring I2 is arranged on the side of the dust ring 1; a steel back bearing 5 is arranged at the contact part of the cylinder body 6 and the piston rod 7, and the contact part of the steel back bearing 5 and the guide sleeve 3 is sealed by an O-shaped sealing ring 4;

the rear buffer hydraulic cylinder also comprises a piston assembly 9, the piston assembly 9 is arranged in the cylinder body 6, and a spring is wound on the piston assembly 9; a support ring 10 is sleeved between the piston assembly 9 and the cylinder body 6, and the support ring 10 and the cylinder body 6 are sealed and fixed through a U-shaped sealing ring II 11.

In some embodiments, further, a stop piece is arranged at the contact part of the first U-shaped sealing ring 2 and the piston rod 7. And the fixed sealing parts of the U-shaped sealing ring II 11 and the piston assembly 9 are provided with baffle plates, and the piston rod 7 and the piston assembly 9 are integrally fixed in the cylinder body 6 through a pin 12.

Specifically, the cylinder body 6 is a hollow cylinder, and the inner diameter of the bottom circle of the cylinder body is 45 mm. The diameter of the piston rod 7 is 36 mm. The surface of the cylinder body 6 is sprayed with matt gray PANTONE432 acrylic polyurethane enamel with the glossiness of 40 percent. The overall length of the rear buffer hydraulic cylinder is 1400 mm.

During specific work, the guide sleeve 3 is sleeved outside the cylinder body 6, and the dust ring 1 and the U-shaped sealing ring I2 are arranged between the guide sleeve 3 and the cylinder body 6. Sealing the contact part through a U-shaped sealing ring I2; a steel back bearing 5 is arranged at the joint of the piston rod 7 and the cylinder body 6; by combining the U-shaped sealing ring and the O-shaped sealing ring, in the moving process of the hydraulic cylinder, the pressure applied to the U-shaped sealing ring is further transmitted to the O-shaped sealing ring, and the O-shaped sealing ring converts the maximum pressure point to the edge of the sealing ring, so that good sealing is realized; through setting up the dirt proof boot, can avoid the problem of the sealed failure that produces because of the dust gets into along with the motion of piston rod.

Through set up piston assembly 9 at the rear end of cylinder body 6, piston assembly 9 surrounds the spring all around, through set up piston assembly 9 in the cavity of cylinder body 6 rear end, piston assembly 9 forms corresponding piston cushion chamber, the piston rod can insert in the corresponding piston cushion chamber, once damps to the fluid formation in the piston cushion chamber, when the piston rod continues the return stroke to remove, hydraulic oil in the piston cushion chamber is compressed and flows back via the oil duct that the cross-sectional area is littleer to form hydraulic damping to the piston member, reach good buffering effect.

The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or scope of the invention as defined in the accompanying claims.

Claims

1. A damping cylinder, comprising:

a cylinder body (6);

a piston rod (7);

the piston rod (7) is positioned in the cylinder body (6), one end of the cylinder body (6) is provided with a guide sleeve (3), and the piston rod (7) is sleeved on the guide sleeve (3) in a sliding manner; a dust ring (1) is arranged at the sliding sleeve joint of the piston rod (7) and the guide sleeve (3), and a U-shaped sealing ring I (2) is arranged on the side of the dust ring (1); a steel back bearing (5) is arranged at the contact part of the cylinder body (6) and the piston rod (7), and the contact part of the steel back bearing (5) and the guide sleeve (3) is sealed by an O-shaped sealing ring (4);

the rear buffer hydraulic cylinder also comprises a piston assembly (9), the piston assembly (9) is arranged in the cylinder body (6), and a spring is wound on the piston assembly (9); a support ring (10) is sleeved between the piston assembly (9) and the cylinder body (6), and the support ring (10) and the cylinder body (6) are sealed and fixed through a U-shaped seal ring II (11).

2. A damping cylinder according to claim 1, characterized in that the contact part between the first U-shaped seal ring (2) and the piston rod (7) is provided with a baffle.

3. The damping cylinder according to claim 1, wherein a stop piece is arranged at the fixed sealing part of the second U-shaped sealing ring (11) and the piston assembly (9).

4. A rear damping cylinder according to claim 1, characterized in that the piston rod (7) and the piston assembly (9) are fixed in the cylinder body (6) in one piece by means of a pin (12).

5. The post-damping hydraulic cylinder according to claim 1, wherein the cylinder body (6) is a hollow cylinder having a base circle inner diameter of 45 mm.

6. A post-damping cylinder according to claim 1, characterized in that said piston rod (7) has a diameter of 36 mm.

7. A rear cushion hydraulic cylinder according to claim 1, wherein the surface of the cylinder body (6) is coated with matt grey PANTONE432 acrylic urethane enamel with a gloss of 40%.

8. The back cushion hydraulic cylinder according to claim 1, wherein the overall length of the back cushion hydraulic cylinder is 1400 mm.