Link bolt with unloading overflow valve

Abstract

The invention discloses a link bolt with an unloading overflow valve, which is formed by additionally arranging an unloading overflow valve on the prior link bolt. The function of unloading overflow valve is integrated with the function of the link bolt. An outlet of a cross passage is communicated with a hydraulic system, and when the liquid pressure of the hydraulic system is larger than the threshold value of the overflow valve, liquid enters a passage I to exert pressure to a control piston, then the control piston pushes a cone valve open so as to enable liquid in the link bolt to enter a cavity through a passage II, liquid in the cavity enters an oil return hole through an oil drain hole, an adjusting spring can move up along a mounting passage because the pressure between a gland and the adjusting spring is reduced, and the liquid in the link bolt can enter an oil tank through the oil return hole to realize the unloading overflow when a high-pressure passage ascends to the oil return hole. By cooperating the unloading overflow valve and the link bolt, the liquid pressure can be stabilized, and the unloading effect can be realized. The link bolt with the unloading overflow valve has obvious effect, convenient installation and low failure rate.

Description

technical field [0001] The invention relates to the field of bolts, in particular to a hinged bolt with an unloading overflow valve. Background technique [0002] The hinged bolts in the prior art generally include a bolt head and a screw rod. A central channel is provided in the screw rod, and a transverse channel is provided on the wall of the screw rod to communicate with the central channel. Hinged bolts are widely used, mainly used on oil roads, such as oil block, oil pump inlet and outlet, etc. The outlet of the transverse passage is generally connected with the hydraulic system, and in the process of use in these fields, the hinged bolt only acts as a hinge and does not change the hydraulic pressure. The liquid pressure inside the system, of course, will not have a stabilizing and unloading effect on the system. Therefore, it is usually necessary to install relief valves, check valves and other related components on the oil circuit to maintain the stability and safet...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the unloading overflow valve and the hinged bolt are separated. If it is necessary to keep the hydraulic pressure on the oil circuit constant, an additional unloading overflow valve needs to be installed. Due to the limited space for assembly, installing an additional overflow valve not only gives Installation and parts assembly have brought difficulties, added parts, the process is relatively troublesome, and the failure rate is also high, which is not conducive to maintenance and brings inconvenience to the use of the device

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