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Intelligent speed-limiting cut-off valve

A technology of intelligent speed limit and cut-off valve, applied in the hydraulic field, can solve the problems of severe load shock, noise, hydraulic system impact, etc., and achieve the effect of smooth braking performance

Inactive Publication Date: 2019-01-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing speed-limiting cut-off valves all adopt the principle of mechanical-hydraulic feedback. When the speed-limiting cut-off valve cuts off the oil circuit, the load often has a relatively large movement speed, which causes severe vibration of the load and causes shock and noise in the hydraulic system.

Method used

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Examples

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Embodiment Construction

[0015] by figure 2 A typical hydraulic elevator system is given as an example. In the actual application process, the intelligent speed-limiting cut-off valve involved in the present invention is installed on the plunger cylinder 12. The intelligent speed-limited cut-off valve includes: 1. 1. Hydraulic valve body, 2. Hydraulic spool, 3. Proportional electromagnetic Iron, 4. Return spring, 5. Pressure sensor before the valve, 6. Pressure sensor after the valve, 7. Speed ​​limit cut-off controller.

[0016] When the elevator descends due to accidental overspeed, the speed limit cut-off controller 7 calculates the flow q of the speed limit cut-off valve x Exceeded the set value q m , the spool action of the speed-limiting cut-off valve is triggered immediately, and the spool action is divided into two stages: the first stage is pressure control, that is, the control target at this time is to detect the pre-valve pressure and control the pre-valve pressure to a set value , thi...

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Abstract

The invention relates to an intelligent speed-limiting cut-off valve. The intelligent speed-limiting cut-off valve mainly comprises a hydraulic valve core, a valve body, a return spring, a proportional electromagnet, a valve front pressure sensor, a valve rear pressure sensor, a speed-limiting cut-off controller and other parts. The valve uses the valve front pressure, valve rear pressure and a proportional electromagnet control signal to calculate and measure the flow rate of a valve port. When the flow rate exceeds a set value, the speed-limiting cut-off controller quickly and stably closesthe valve port and cuts off an oil path through two control modes of pressure control and flow control successively. The intelligent speed-limiting cut-off valve can be applied to occasions such as engineering machinery, hydraulic elevators and hydraulic lifting platforms and can prevent accidents such as overspeed falling caused by pipeline rupture of vertical loads.

Description

technical field [0001] The invention relates to a speed-limiting cut-off valve applied to construction machinery, hydraulic elevators, hydraulic lifting platforms, etc., and belongs to the field of hydraulic technology. Background technique [0002] Due to its large power-to-weight ratio, hydraulic transmission is easy to realize stepless speed regulation and precise control, and the movement is stable. It is widely used in logistics, transportation, marine, construction and other fields. In the actual application process, it is very common to realize vertical load lifting and lowering, such as excavators, cranes, hydraulic elevators, offshore platforms, etc. In these occasions, in order to prevent the load from over-speed falling due to pipeline rupture and loose joints, a speed-limiting cut-off valve must be installed. When the speed limit cut-off valve detects that the flow through it exceeds a certain value, it will automatically cut off the oil circuit to achieve safe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B20/00F15B13/01B66B5/04
Inventor 程敏韩泽南
Owner CHONGQING UNIV
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