Shuttle valve, shuttle valve driving type device, winding drum brake cylinder control loop and crane

Abstract

The invention relates to a shuttle valve which comprises a valve rod type valve core (11), when the output end of the shuttle valve is communicated with one of a first input end and a second input end; and one end face of the valve core and an inner wall surface, which is corresponding to one end of a valve cavity form an end face seal, and the periphery surface of the valve core (11) and an inner periphery surface of the valve cavity corresponding to one section form a cylindrical surface sealing, and an output end and the other one of the first input end and the second input end are mutually closed through the end face seal and the cylindrical surface seal. In addition, the invention also provides a shuttle valve driving type device comprising the shuttle valve, a winding drum brake cylinder control loop and a crane. The shuttle valve provided by the invention adopts a unique valve rod type valve core, the double seal is formed in a shuttle valve working process through an end face seal and the cylindrical surface seal, and the shuttle valve is capable of effectively working in a hydraulic system with relatively higher oil pressure; and the shuttle valve can effectively receive impaction and is not easy to transform, the service performance is reliable, the sealing property is relatively better, and the service life of the products is observably prolonged.

Description

technical field [0001] The present invention relates to a hydraulic control valve, in particular to a shuttle valve. Further, the present invention also relates to a shuttle valve-driven device integrated with the shuttle valve. In addition, the invention also relates to a drum brake cylinder control circuit and a crane. Background technique [0002] With the development of hydraulic technology, the oil pressure in the hydraulic system is getting higher and higher, but the increase in oil pressure also puts forward higher requirements on the pressure-bearing performance of the relevant valves in the hydraulic system. [0003] The shuttle valve is mainly used to realize the pressure selection function in the hydraulic system, which includes two input ports and one output port. When the oil pressure of the hydraulic oil input by the two input ports is different or only one input port has oil pressure, Through the movement of the shuttle valve spool, the input port with highe...

AI Technical Summary

Problems solved by technology

However, when the pressures at the input ports a and b are relatively high (such as above 40MPa), this kind of impact will put forward higher requirements on the materials used for the shuttle valve sleeve 9x and the steel ball 10x. If the materials cannot be improved accordingly, this The design structure will greatly reduce its service life

[0015] to combine figure 2 , when the input port a or b enters the oil, the valve stem 8 will move to the left, and the positioning of the left side of the valve stem 8 will be realized through the contact of the gasket 7 with the right end surface of the screw sleeve 3, if the input port a, b enters the oil When the pressure is very high (such as above 40MPa), the gasket 7 will have a strong impact on the right end surface of the screw sleeve 3. On the one hand, this impact will easily deform the gasket 7 and the right end surface of the screw sleeve 3. It is easy to loosen the threaded connection between the screw sleeve 3 and the valve body 6

[0016] Combining the above content, it can be concluded that the prior art mainly has two disadvantages: first, the existing structure of the above-mentioned steel ball shuttle valve is not suitable for working conditions with relatively high pressure (such as above 40MPa). It will seriously reduce the service life of the steel ball shuttle valve, resulting in unreliable performance and poor sealing; second: when the control pressure (such as above 40MPa) is high, it is easy to make the valve stem 8 move in place when the reversing is in place. A strong rigid impact occurs between the limit parts or limit structures of the rod 8, such as in figure 2 Among them, the right end surface of the gasket 7 and the screw sleeve 3 is used as the limiting structure for the valve stem 8 to move to the left (of course, the limiting structure or the limiting member for the reversing movement of the valve stem 8 is not limited to figure 2 The specific form shown in ), at this time, the gasket 7 and the right end surface of the screw sleeve 3 will be strongly impacted and easily deformed and damaged. produce loose

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