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Safety lifting device of dump truck

A lifting device and vehicle technology, which is applied to fluid pressure actuating devices, vehicles with tilt bearing motion, fluid pressure actuating system safety, etc., to achieve the effects of simple operation and reduced production costs

Inactive Publication Date: 2018-04-13
陈连娣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a safety lifting device for dump vehicles, which improves the design of the gear pump control valve and uses a two-way return spring to make the lifting device lift the dump vehicle During the lifting or lowering operation, once the external control force disappears, it will automatically return to the neutral stop state, thus effectively avoiding the potential safety hazard of loss of control during the lifting or lowering process

Method used

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  • Safety lifting device of dump truck
  • Safety lifting device of dump truck
  • Safety lifting device of dump truck

Examples

Experimental program
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Effect test

Embodiment 1

[0023] see Figure 1 ~ Figure 4 , a safety lifting device for a dump vehicle, including a gear pump 1 that supplies high-pressure oil, a control valve 2 that controls the oil output state of the gear pump 1, and an oil cylinder (not shown in the figure) that pushes the bucket of the dump truck up and down. The pump body 11 of the gear pump 1 is provided with an oil inlet 112 and an oil outlet 113 . When the gear pump 1 works, the oil inlet 112 sucks oil from the oil tank into the pump chamber 111 to generate high-pressure oil, which is output from the oil outlet 113 to the oil cylinder. see Figure 4 , Figure 5 and Figure 6 , the control valve 2 includes a valve body provided with a valve hole 21, a check valve 23 arranged at the oil outlet 113, a valve stem 22 slidingly connected in the valve hole, a return spring 27, a first stop 241 and For the second limit 242 , the valve rod 22 is provided with a first acting end surface 261 and a second acting end surface 262 actin...

Embodiment 2

[0027] This embodiment also uses pressure gas as the external force source, except for the piston 25, the return spring 27, the first limit 241, the second limit 242, the first acting end surface 261 and the second acting end surface 262 in the control part structure of the control valve. Except that the structure setting is different, all the other are identical with embodiment one.

[0028] see Figure 9 , in this embodiment, the first limit 241 and the second limit 242 are far away from the valve body 11 , and the piston 25 is arranged on the valve stem 22 close to the valve body 11 . The first stop 241 is a shoulder of the cylinder 24 , and the second stop 242 is an end surface of the inner sleeve 32 of the end cap. The return spring 27 is disposed between the first limiting position 241 and the second limiting position 242 through the first spring seat 28 and the second spring seat 29 . The first active end surface 261 is an end surface of a top sleeve 26 disposed betwe...

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PUM

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Abstract

The invention discloses a safety lifting device for a dump vehicle, which comprises a gear pump, a control valve and an oil cylinder; the control valve comprises a valve body provided with a valve hole, a valve stem slidably arranged in the valve hole, a one-way Valve and a return spring; the valve stem can be selectively in the first position to make the device in the lifting state, the second position to make the device in the neutral state and the device in the lowering state under the action of external force Switch between the third position; the two-way return setting of the return spring makes the valve stem return to the second position when the external force disappears. Through the improved design of the gear pump control valve, and through a two-way return spring, the lifting device automatically returns to the neutral stop state when the external force disappears, effectively solving the safety hazard of the device being out of control during the lifting or lowering process.

Description

technical field [0001] The invention relates to a dump truck hydraulic lifting device, in particular to a dump truck hydraulic lifting device with a safety structure. Background technique [0002] At present, there are two types of hydraulic control systems used on dump trucks: pneumatic control and manual control. At present, in the manual control hydraulic system on the market, a manual four-way rotary valve is used to control the lifting or lowering of the lifting cylinder. There is no safety protection device in the entire hydraulic system, and there are potential safety hazards in use. This hidden danger is mainly reflected in that when the external force for manipulating the control valve disappears, the lifting device is out of control. This hidden danger also exists in the existing lifting device that adopts pneumatic control. For example, the Chinese invention patent application whose publication number is CN102996551A discloses a reversing control valve for dump ...

Claims

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Application Information

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IPC IPC(8): B60P1/16F15B13/02F15B20/00
CPCB60P1/16F15B13/021F15B20/00
Inventor 洪语婕郑舒杰陈连娣
Owner 陈连娣