Link bolt capable of maintaining stable internal hydraulic pressure

Abstract

The invention discloses a link bolt capable of maintaining stable internal hydraulic pressure. The link bolt comprises a bolt head (1) and a screw (2), wherein a central passage (3) is formed in the screw (2); the wall of the screw (2) is provided with a transverse passage (4) communicated with the central passage (3); the link bolt also comprises an overflow valve; an overflow valve mounting passage (5) which is communicated with the central passage (3) is formed in the bolt head; the overflow valve comprises a gland bush (6), a valve core I (7), an adjusting nut (8), an adjusting rod (9), apiston type spring seat (10), a pressure adjusting piston (11), a spring I (12) and a spring II (13); the bolt is provided with an oil return hole (18) in the lateral direction; and the gland bush (6) and the bolt head are provided with oil discharge holes (19). By using the link bolt, the hydraulic pressure in the link bolt can be maintained constant; the hydraulic pressure is stabilized by the cooperative action of the overflow valve and the link bolt; and the link bolt has the advantages of convenient installation and low failure rate.

Description

technical field [0001] The invention relates to the field of bolts, in particular to a hinged bolt capable of maintaining internal hydraulic stability. 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. In the process of use in these fields, hinged bolts only play a hinge role and will not change the hydraulic pressure inside the hydraulic system. The system produces voltage stabilization and unloading. Therefore, it is usually necessary to install relief valves, check valves and other related components on the oil circuit to maintain the stability and safety of the hydraulic system. [0003] The existing hinged bolts are only used as joints in the hydrauli...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the overflow valve and the hinged bolts are separated. If the hydraulic pressure on the oil circuit needs to be kept constant, an additional overflow valve needs to be installed. Due to the limited space for assembly, installing an additional overflow valve is not only difficult for installation and parts assembly. It brings difficulties, adds 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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