Linkage control system of lifting mechanism and walking mechanism of dumper

Abstract

A linkage control system of a lifting mechanism and a walking mechanism of a dumper comprises a first manual reversing valve, a lifting oil cylinder, a gear selecting operating valve, a forward gear clutch, a reverse gear clutch, a hydraulic pump and an oil tank; an executing port A and an executing port B of the first manual reversing valve communicate with a rodless cavity and a rod cavity of the lifting oil cylinder correspondingly; an executing port A and an executing port B of the gear selecting operating valve communicate with the forward gear clutch and the reverse gear clutch correspondingly; a second manual reversing valve is further included; an oil inlet P of the second manual reversing valve communicates with the hydraulic pump; a first oil outlet A of the second manual reversing valve communicates with an oil inlet P of the gear selecting operating valve; and a second oil outlet B of the second manual reversing valve communicates with an oil inlet P of the first manual reversing valve. The linkage control system of the lifting mechanism and the walking mechanism of the dumper can achieve that a piston rod of the lifting oil cylinder cannot stretch out any more when self-discharging operation is performed and a driver cannot engage a forward gear or a reverse gear and starts driving, and after the driver engages the forward gear or the retreat gear and starts driving.

Description

technical field [0001] The invention relates to a dump truck, in particular to a linkage control system of a lifting mechanism and a running mechanism of the dump truck. Background technique [0002] The running mechanism of the dump truck of the prior art is as figure 2 As shown, it includes a gear selection operation valve 60, a forward gear clutch 61, a reverse gear clutch 62, a hydraulic pump 63 and a fuel tank 65, a joystick 60-1 included in the gear selection operation valve 60, an oil inlet of the hydraulic pump 63 and a fuel tank 65 The oil inlet port P of the gear selection operation valve 60 is connected with the oil outlet port of the hydraulic pump 63, the execution port A of the gear selection operation valve 60 is connected with the forward gear clutch 61, and the execution port B port of the gear selection operation valve 60 It communicates with the reverse gear clutch 62, and the joystick 60-1 of the gear selection operating valve 60 is connected with the ge...

AI Technical Summary

Problems solved by technology

[0004] When the dump truck is performing self-unloading operations, the driver should not put forward gear or reverse gear and start driving. This is because the cabin of the dump truck is still in the lifting state. Start driving, accidents are prone to occur when the dump truck passes through a place with a low height

After the driver puts forward gear or reverse gear and starts driving, the piston rod of the lifting cylinder 51 should no longer be stretched out. , accidents are prone to occur when the dump truck passes through a place with a low height

[0005] Linkage control cannot be realized between the running mechanism and the lifting mechanism of the dump truck in the prior art. When the dump truck is performing dump operation, the driver can still put forward gear or reverse gear and start driving. At this time, the compartment of the dump truck It is still in the lifting state, and it is easy to cause accidents when the dump truck passes through a place with a low height

When the driver puts forward gear or reverse gear and starts driving, if the driver accidentally touches the first manual reversing valve 50, and makes the oil inlet P of the first manual reversing valve 50 communicate with the execution port A , the pressure oil in the hydraulic pump 63 will enter the rodless chamber of the lifting cylinder 51 through the first manual reversing valve 50, and the piston rod of the lifting cylinder 51 will stretch out to drive the cabin of the dump truck to lift, that is, when the driver The piston rod of the lifting cylinder 51 can still be stretched out when the forward gear or the reverse gear is engaged and the vehicle starts to drive, thereby driving the cabin of the dump truck to be lifted, so accidents are likely to occur when the dump truck passes through a place with a lower height

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