Initial support force, overpressure led warning large flow safety valve

Abstract

The invention discloses an initial supporting force and supervoltage LED caution mass flow safety valve. A connector and an end cover are in threaded connection with one end of a valve shell in sequence; a switch base, a first spring base, a second spring base, a threaded pipe and a pressure adjusting screw are arranged in the valve shell, and a circuit board is arranged in the connector; a piston base for three piston rods is arranged in a valve element; three spring rods sleeved with mold springs are arranged on the first spring base, switches K1, K2 and K3 are arranged on switch bases, and the switches K1, K2 and K3 and the spring rods correspond to the piston rods respectively and are approximately located on one axis; the circuit board is provided with a battery, a first LED lamp and a second LED lamp, and all switch bases are fixed to the first spring base through adjusting springs and adjusting screws and are connected with the circuit board through sheathed lines. The initial supporting force and supervoltage LED caution mass flow safety valve has the function that an alarm is given when the force is lower than the initial supporting force and the pressure of a piston cavity of a cylinder excesses the standard pressure, and the undervoltage and overvoltage voltage numerical values can be adjusted according to requirements; the service life of a hydraulic support can be prolonged, the production cost can be saved, the production efficiency can be improved, and the safe underground working face can be guaranteed.

Description

technical field [0001] The invention relates to a warning device, in particular to a safety valve of a coal mine hydraulic support. Background technique [0002] The safety valve is one of the control and overload protection elements of the coal mine hydraulic support. It is used to control the actual resistance of the tooling and make it not exceed the allowable value, so that the support has shrinkability and constant resistance. Its performance directly affects the strength and strength of the support. The safety factor affects the performance of the support capacity, affects the load capacity and self-weight ratio of the support, and affects the safety of miners. [0003] If the support is lower than the rated initial support force or works between the lower working resistance, it will lead to the following consequences: the roof will break away from the layer prematurely, causing the coal wall slabs and ends to rise, and then expand to the roof beam, making the The sur...

AI Technical Summary

Problems solved by technology

[0003] If the support is lower than the rated initial support force or works between the lower working resistance, it will lead to the following consequences: the roof will break away from the layer prematurely, causing the coal wall slabs and ends to rise, and then expand to the roof beam, making the The surrounding rock system of the bracket is out of balance; or, the bracket cannot be cut at the ideal position behind the bracket. During the deflection and deformation of the roof, the bracket only serves as a supporting point, thereby prolonging the breaking length of the old roof beam and making the work The step distance and slump height of the old roof cycle increase, which eventually leads to strong large-area periodic pressure, and even vicious accidents such as chipping, crushing, and crushing of supports.

[0004] In actual work, the initial support force is greatly affected by human factors, which not only makes the working resistance level low after the actual initial support force, but also makes the support work resistance of each support on the working face inconsistent, or even has a large difference

Images