CN220081829U

CN220081829U - Hydraulic cylinder

Info

Publication number: CN220081829U
Application number: CN202320646151.9U
Authority: CN
Inventors: 舒平国; 钟义海; 李朝; 毛朝忠
Original assignee: Ningbo Zhongtian Haide Hydraulic Co ltd
Current assignee: Ningbo Zhongtian Haide Hydraulic Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-11-24
Anticipated expiration: 2033-03-29

Abstract

The utility model relates to a hydraulic cylinder, which comprises a cylinder body and a piston rod, wherein a nipple joint is fixed at one end of the cylinder body, a guide sleeve is arranged at the other end of the cylinder body, the piston rod is positioned in the cylinder body, a piston is arranged at one end of the piston rod, the piston is positioned at the nipple joint end, and the other end of the piston rod is inserted into the guide sleeve; the center of one end of the piston is provided with a one-way valve component, the one-way valve component faces the nipple joint, an oil duct is arranged in the nipple joint, an opening at one end of the oil duct faces the one-way valve component, and an opening at the other end of the oil duct is positioned on the side surface of the nipple joint and is used for being connected with an external oil pipe for installation, and the side surface is in an inclined surface shape; the utility model has the advantages of buffer function and convenient installation between the external oil pipe and the nipple joint.

Description

Hydraulic cylinder

Technical Field

The utility model belongs to the technical field of hydraulic cylinders, and particularly relates to a hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). When it is used to realize reciprocating motion, it can eliminate speed reducer, and has no transmission clearance and smooth motion, so that it can be widely used in hydraulic systems of various machines. However, with the continuous improvement of the use requirement of the hydraulic industry on the oil cylinder, the buffer function of the oil cylinder in the actual use process, the connection structure between the external oil pipe and the oil nozzle joint, the interface where the oil nozzle joint is connected with the external oil pipe, and the circumferential surface of the oil cylinder are flush, so that in a relatively narrow installation environment, the distributed interface is very inconvenient to operate when being installed with the external oil pipe.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the hydraulic cylinder which has a buffering function and is convenient to install between an external oil pipe and a nipple joint.

The hydraulic oil cylinder comprises a cylinder body and a piston rod, wherein a nipple joint is fixed at one end of the cylinder body, a guide sleeve is arranged at the other end of the cylinder body, the piston rod is positioned in the cylinder body, a piston is arranged at one end of the piston rod, the piston is positioned at the nipple joint end, and the other end of the piston rod is inserted into the guide sleeve; the one-way valve assembly is installed at the center of one end of the piston, the one-way valve assembly faces the nipple joint, an oil duct is arranged in the nipple joint, an opening at one end of the oil duct faces the one-way valve assembly, an opening at the other end of the oil duct is located on the side face of the nipple joint and used for being connected with an external oil pipe for installation, and the side face is in an inclined plane shape.

The beneficial effects of the utility model are as follows: compared with the prior art, by arranging the one-way valve assembly, part of hydraulic oil can slowly flow into the oil duct through the one-way valve assembly in the resetting process of the piston rod, and the buffering performance is better; and meanwhile, the oil duct opening is in an inclined plane shape, so that the oil duct opening is convenient to be connected with an external oil pipe for installation in a relatively narrow installation environment.

Preferably, an annular oil return groove is formed in the inner wall of the cylinder body, and the oil return groove is located on the guide sleeve side; in the resetting process of the piston rod, when pressure is applied between the cylinder body and the piston rod through hydraulic oil, the piston rod can play a further role in buffering through the oil return groove.

Preferably, the oil return grooves are provided with at least three circles, and the adjacent oil return grooves are spirally distributed; this results in a better cushioning effect.

Preferably, the check valve assembly comprises a check valve and a limiting unit, the check valve is positioned in a mounting groove arranged in the center of one end of the piston, the limiting unit is arranged at one end of the mounting groove and limits and fixes the check valve in the mounting groove, the limiting unit comprises a baffle plate and a check ring, the baffle plate is abutted against one end of the check valve, the check ring is clamped in a clamping groove arranged in the mounting groove, and the check ring is abutted against the baffle plate; through the arrangement of the structure, the installation and the disassembly of the one-way valve assembly are more convenient, and convenience is brought to the later maintenance.

Preferably, the one-way valve comprises a first valve body, a second valve body and a valve core, wherein the first valve body is fixed with the second valve body in a threaded connection mode, and through holes for hydraulic oil to circulate are formed in the axial centers of the first valve body and the second valve body; the valve core is arranged in a cavity formed by the first valve body and the second valve body, and the shaft core of the valve core and the hole core of the through hole are positioned on the same straight line; a return spring is arranged between the tail end of the valve core and one end of the second valve body, and the head end of the valve core is abutted against one end of the first valve body through the return spring; the check valve with the structure is very convenient to assemble, and the buffer property of the hydraulic oil in the backflow process is better through the arrangement of the reset spring, so that the phenomenon that the valve core is suddenly opened can not occur.

Preferably, a first groove is formed in the inner circumferential wall of the first valve body, a first sealing ring is installed in the first groove, and the first sealing ring is in contact with the head end side wall of the valve core; thus, the valve core and the first valve body have better sealing performance when being closed.

Preferably, a second groove is formed in the peripheral wall of the second valve body, a second sealing ring is installed in the second groove, and the second sealing ring is in contact with the groove wall of the mounting groove; thus, the sealing performance between the second valve body and the mounting groove is better.

Preferably, the oil passage comprises a first oil passage and a second oil passage, wherein the first oil passage and the second oil passage are distributed in an included angle shape and are communicated with each other, the first oil passage is arranged along the central line of the nipple, an opening of the first oil passage faces the one-way valve assembly, and an opening of the second oil passage is positioned on the side surface of the nipple; the hydraulic oil in the oil duct is buffered through the oil duct distributed in an included angle shape.

Drawings

Fig. 1 is a schematic view of a front sectional structure of the present utility model.

Fig. 2 is an enlarged schematic view of the structure at a in fig. 1.

The reference numerals in the drawings are respectively: 1. a cylinder; 2. a piston rod; 3. a nipple joint; 4. a guide sleeve; 5. a piston; 6. a one-way valve assembly; 7. an oil passage; 11. an oil return groove; 31. a side surface; 51. a mounting groove; 61. a one-way valve; 62. a limit unit; 51-1, a clamping groove; 61-1, a first valve body; 61-2, a second valve body; 61-3, valve core; 61-4, through holes; 61-5, cavity; 61-6, a return spring; 61-7, a first sealing ring; 61-8, a second sealing ring; 62-1, a baffle; 62-2, check rings; 71. a first oil passage; 72. and a second oil passage.

Detailed Description

The utility model will be described in detail below with reference to the attached drawings: as shown in figures 1 and 2, the utility model comprises a cylinder body 1 and a piston rod 2, wherein one end of the cylinder body 1 is fixed with a nipple joint 3 in a welding mode, the other end of the cylinder body 1 is provided with a guide sleeve 4, the piston rod 2 is positioned in the cylinder body 1, one end of the piston rod 2 is provided with a piston 5, the piston 5 is positioned at the nipple joint 3, and the other end of the piston rod 2 is inserted into the guide sleeve 4; the one-way valve assembly 6 is installed in the center of one end of the piston 5, the one-way valve assembly 6 faces the nipple 3, the oil duct 7 is arranged in the nipple 3, the opening of one end of the oil duct 7 faces the one-way valve assembly 6, the opening of the other end of the oil duct 7 is located on the side face 31 of the nipple 3 and used for being connected with an external oil pipe for installation, and the side face 31 of the nipple 3 with the opening is in an inclined plane shape.

An annular oil return groove 11 is formed in the inner wall of the cylinder body 1, and the oil return groove 11 is positioned on the side of the guide sleeve 4; the oil return grooves 11 are provided with at least three circles, and the adjacent oil return grooves 11 are spirally distributed.

The check valve assembly 6 comprises a check valve 61 and a limiting unit 62, the check valve 61 is positioned in a mounting groove 51 arranged in the center of one end of the piston 5, the limiting unit 62 is arranged on one end of the mounting groove 51 and limits and fixes the check valve 61 in the mounting groove 51, the limiting unit 62 comprises a baffle plate 62-1 and a baffle plate 62-2, the baffle plate 62-1 is abutted against one end of the check valve 61, the baffle plate 62-2 is clamped in a clamping groove 51-1 arranged in the mounting groove 51, and the baffle plate 62-2 is abutted against the baffle plate 62-1; the one-way valve 61 comprises a first valve body 61-1, a second valve body 61-2 and a valve core 61-3, wherein the first valve body 61-1 is fixed with the second valve body 61-2 in a threaded connection mode, and through holes 61-4 for hydraulic oil to circulate are formed in the axial centers of the first valve body 61-1 and the second valve body 61-2; the valve core 61-3 is arranged in a cavity 61-5 formed by the first valve body 61-1 and the second valve body 61-2, and the shaft core of the valve core 61-3 and the hole core of the through hole 61-4 are positioned on the same straight line; a return spring 61-6 is installed between the tail end of the valve core 61-3 and one end of the second valve body 61-2, and the head end of the valve core 61-3 is abutted against one end of the first valve body 61-1 by the return spring 61-6.

The inner circumferential wall of the first valve body 61-1 is provided with a first groove, a first sealing ring 61-7 is arranged in the first groove, and the first sealing ring 61-7 is contacted with the head end side wall of the valve core 61-3; the outer circumferential wall of the second valve body 61-2 is provided with a second groove, a second sealing ring 61-8 is installed in the second groove, and the second sealing ring 61-8 is contacted with the groove wall of the installation groove 51.

The oil duct 7 includes a first oil duct 71 and a second oil duct 72, the first oil duct 71 and the second oil duct 72 are distributed in an angle shape and are communicated with each other, the first oil duct 71 is arranged along the center line of the nipple 3, the opening of the first oil duct 71 faces the check valve assembly 6, and the opening of the second oil duct 72 is located on the side 31 of the nipple 3.

The working principle of the utility model is as follows: the opening of the second oil duct 71 is connected with an external oil pipe, hydraulic oil with pressure is introduced into the oil duct 7 through the second oil duct 71 and flows into the end face of the piston 5 through the first oil duct 71, at the moment, the head end of the valve core 61-3 is in contact with one end of the first valve body 61-1, so that the hydraulic oil pushes the piston 5 and the piston rod 2 to axially move, the extension movement of the hydraulic oil cylinder is realized, when the piston rod 2 needs to be reset, the hydraulic oil with pressure is introduced between the cylinder body 1 and the piston rod 2, part of the hydraulic oil flows into the oil duct 7 through the one-way valve assembly 6, at the moment, the head end of the valve core 61-3 is not in contact with one end of the first valve body 61-1, and the reset spring 61-6 is in a compressed state, so that the buffering effect is realized.

The present utility model is not limited to the above embodiments, and any modification of the structural design provided by the present utility model, regardless of any changes in shape or material composition, should be considered as being within the scope of the present utility model.

Claims

1. The utility model provides a hydraulic cylinder, includes cylinder body (1) and piston rod (2), its characterized in that: one end of the cylinder body (1) is fixed with a nipple joint (3), the other end of the cylinder body is provided with a guide sleeve (4), the piston rod (2) is positioned in the cylinder body (1), one end of the piston rod (2) is provided with a piston (5), the piston (5) is positioned at the nipple joint (3), and the other end of the piston rod (2) is inserted into the guide sleeve (4); one end center department of piston (5) installs check valve subassembly (6), just check valve subassembly (6) orientation in glib joint (3), be equipped with oil duct (7) in glib joint (3), the opening of oil duct (7) one end orientation in check valve subassembly (6), the opening of oil duct (7) other end is located on glib joint (3) side (31) and be used for being connected with outside oil pipe and install, just side (31) are the inclined plane form.

2. The hydraulic ram of claim 1, wherein: an annular oil return groove (11) is formed in the inner wall of the cylinder body (1), and the oil return groove (11) is located on the side of the guide sleeve (4).

3. The hydraulic ram of claim 2, wherein: the oil return grooves (11) are provided with at least three circles, and the adjacent oil return grooves (11) are spirally distributed.

4. The hydraulic ram of claim 1, wherein: the check valve assembly (6) comprises a check valve (61) and a limiting unit (62), the check valve (61) is located in a mounting groove (51) formed in the center of one end of the piston (5), the limiting unit (62) is installed on one end of the mounting groove (51) and limits and fixes the check valve (61) in the mounting groove (51), the limiting unit (62) comprises a baffle plate (62-1) and a check ring (62-2), the baffle plate (62-1) is abutted against one end of the check valve (61), the check ring (62-2) is clamped in a clamping groove (51-1) formed in the mounting groove (51), and the check ring (62-2) is abutted against the baffle plate (62-1).

5. The hydraulic ram of claim 4, wherein: the one-way valve (61) comprises a first valve body (61-1), a second valve body (61-2) and a valve core (61-3), wherein the first valve body (61-1) is fixed with the second valve body (61-2) in a threaded connection mode, and through holes (61-4) for hydraulic oil to circulate are formed in the axial centers of the first valve body (61-1) and the second valve body (61-2); the valve core (61-3) is arranged in a cavity (61-5) formed by the first valve body (61-1) and the second valve body (61-2), and the shaft core of the valve core (61-3) and the hole core of the through hole (61-4) are positioned on the same straight line; a return spring (61-6) is arranged between the tail end of the valve core (61-3) and one end of the second valve body (61-2), and the head end of the valve core (61-3) is abutted against one end of the first valve body (61-1) through the return spring (61-6).

6. The hydraulic ram of claim 5, wherein: the inner circumferential wall of the first valve body (61-1) is provided with a first groove, a first sealing ring (61-7) is arranged in the first groove, and the first sealing ring (61-7) is contacted with the head end side wall of the valve core (61-3).

7. The hydraulic ram of claim 5, wherein: the outer circumferential wall of the second valve body (61-2) is provided with a second groove, a second sealing ring (61-8) is installed in the second groove, and the second sealing ring (61-8) is in contact with the groove wall of the installation groove (51).

8. The hydraulic ram of claim 1, wherein: the oil duct (7) comprises a first oil duct (71) and a second oil duct (72), wherein the first oil duct (71) and the second oil duct (72) are distributed in an included angle shape and are communicated with each other, the first oil duct (71) is arranged along the central line of the oil nozzle joint (3), the opening of the first oil duct (71) faces the one-way valve assembly (6), and the opening of the second oil duct (72) is positioned on the side surface (31) of the oil nozzle joint (3).