Unloading valve, combination valve comprising unloading valve and combination valve type buffer oil cylinder

A technology of unloading valve and combination valve, applied in the field of hydraulic oil cylinder and hydraulic valve, can solve the problems of difficulty in throttle control, low buffer quality, large mechanical impact and impact, avoid power consumption and system heating, and improve buffer effect. , The effect of protecting the hydraulic system

Inactive Publication Date: 2021-01-08
QINGDAO ACME INNOVATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an unloading valve, a combination valve including the unloading valve, and a combined valve type buffer oil cylinder, so as to solve the problem of the large mechanical collision impact caused by the piston movement of the hydraulic cylinder in the prior art, resulting in oil leakage from the oil cylinder. , Cylinder head falling off, cylinder bottom cracking, piston loosening and

Method used

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  • Unloading valve, combination valve comprising unloading valve and combination valve type buffer oil cylinder
  • Unloading valve, combination valve comprising unloading valve and combination valve type buffer oil cylinder
  • Unloading valve, combination valve comprising unloading valve and combination valve type buffer oil cylinder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0046]Example 1

[0047]Such asFigure 1-4 As shown, an unloading valve, a combination valve containing the unloading valve, and a combination valve buffer cylinder. The unloading valve is used in conjunction with the cylinder to realize the unloading and buffering function of the cylinder, including a valve body, a valve core 10, and a return valve. The position spring 16, the valve body is provided with a valve hole 12, the valve core is fitted in the valve hole, and the drive cavity 11 of the valve core and the spring cavity 14 of the valve core are formed at both ends of the valve hole. The return spring is set in the spring In the cavity, one end is compressed and pressed against the bottom of the spring cavity, and the other end is compressed and pressed against one end of the valve core. Under the thrust of the return spring, the other end of the valve core is pressed against the bottom of the drive chamber; The core is also provided with a damping hole 15 and an unloading groove...

Example Embodiment

[0053]Example 2:

[0054]Such asFigure 5 ,Figure 6 As shown, a combined valve type buffer cylinder is provided with a combined valve only in the cylinder chamber at one end of the cylinder bottom, and the combined valve is integrated on the cylinder bottom to realize buffering of the cylinder at one end of the cylinder bottom.Figure 5 versusFigure 6 The structure is similar, only the position of the unloading valve is different. Compared with embodiment 1, the main difference is: the valve hole of the unloading valve and the buffer chamber of the throttle valve are both set on the bottom of the cylinder, and the buffer plug of the throttle valve is set at the center of the bottom of the piston rod. Similar to Embodiment 1, it will not be repeated here.

Example Embodiment

[0055]Example 3:

[0056]Such asFigure 7 As shown, a combined valve type buffer oil cylinder is provided with combination valves at both ends of the oil cylinder, which can realize buffering when the piston at either end of the oil cylinder approaches the end of the stroke of the oil cylinder. This embodiment is a composite structure of embodiment 1 and embodiment 2, which can realize the bidirectional buffer function of the oil cylinder. During the working process of the oil cylinder, when the piston approaches the end of the stroke of one end of the oil cylinder, only the combination valve provided at this end is activated to play a buffer function. The function principle is similar to the foregoing, and will not be repeated here.

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Abstract

The invention relates to the field of hydraulic oil cylinders, in particular to an unloading valve, a combination valve comprising the unloading valve and a combination valve type buffer oil cylinder.The unloading valve comprises a valve body, a valve element and a return spring. The valve element is further provided with a damping hole and an unloading groove. The combination valve comprises theunloading valve and a throttling valve. The throttling valve comprises a buffer plug and a buffer cavity. A piston rod assembly of the combination valve type buffer oil cylinder is installed in a cylinder body. The cylinder body comprises a cylinder head flange, a cylinder bottom and a cylinder barrel. The piston rod assembly comprises a guide sleeve, a piston and a piston rod. The combination valve is arranged on the guide sleeve and/or the cylinder bottom. According to the unloading valve, the combination valve comprising the unloading valve and the combination valve type buffer oil cylinder disclosed by the technical scheme, the unloading function of an oil inlet cavity is added, the buffer effect is outstanding, and the buffer pressure is reduced; and meanwhile, a system is in an unloading state in a buffer stage, energy losses and the heating of the system are reduced, pressure impact caused by buffer on the system is avoided, the reliability of the system is improved, and the difficulty of performance matching and installing and debugging of an original buffer valve is lowered.

Description

technical field [0001] The invention relates to the field of hydraulic oil cylinders and hydraulic valves, in particular to an unloading valve, a combined valve including the unloading valve, and a combined valve type buffer oil cylinder. Background technique [0002] The hydraulic cylinder is the key executive component of the hydraulic system of construction machinery, which provides power for the working mechanism of construction machinery and completes various operation cycles, such as shoveling operations of loaders and excavation operations of excavators. The oil cylinders of construction machinery are generally medium and high pressure heavy-duty oil cylinders. The working pressure is relatively high, and the inertia of the reciprocating parts of the oil cylinder is also relatively large. Oil, cylinder head falling off, cylinder bottom cracking, piston loosening and other failures occur, and at the same time, it also brings a large hydraulic shock, causing hydraulic s...

Claims

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Application Information

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IPC IPC(8): F15B15/14F15B15/20F15B15/22F16K17/04
CPCF15B15/1423F15B15/202F15B15/227F16K17/04
Inventor 朱德伟荣晓瑜
Owner QINGDAO ACME INNOVATION TECH CO LTD
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