The hydraulic tilting mechanism of the vehicle

 

(57) Abstract:

The invention relates to hydraulic tipping platform and steering heavy-duty dump trucks (trucks with capacity from 30 to 180 tons and more). The purpose of the invention is the improvement of road safety of the vehicle through reliable and rapid lowering of the platform in case of failure of the hydraulic tilting mechanism. The joint contains hydraulic cylinders, and lowering the platform, three-position spool dispenser, pumps, solenoid valve with electromagnets 7 and 8, power steering, two-position valve, oil tank. The electrical circuit controlling the combined hydraulic actuator includes an electromagnet 7 lowering the platform, the electromagnet 8 rise, the diodes 12, the button 13 15 control switch 14 of the drive control, the relay 17 with the normally closed contacts 18 and coil 19, the position sensor platform with the key 20, the electrical capacity 21, a diode 22. 1 C. p. F.-ly, 2 Il.

The invention relates to a hydraulic tilting mechanisms dump vehicles with electric systemsto through reliable and rapid lowering of the platform in case of failure of the hydraulic tilting mechanism and by reducing the off time of the power steering.

In Fig. 1 shows a diagram of a combined hydraulic tipping mechanism and steering of the vehicle; Fig. 2, the electrical control circuit of the United hydraulic drive vehicle with electric transmission.

The hydraulic actuator includes a hydraulic cylinder 1 lifting and lowering the platform, three-position spool dispenser 2, 3-5 pumps, solenoid valve 6 with the electromagnets 7 and 8, 9 steering steering, two-position valve 10 and the oil tank 11.

The electrical circuit controlling the combined hydraulic actuator includes an electromagnet 7 lowering the platform, the electromagnet 8 of the lifting platform, the diodes 12, buttons 13-15 control switch 16 controls the drive of the truck, the relay 17 with the normally closed contacts 18 and coil 19, the position sensor platform with the key 20, the capacitance 21 and the diode 22.

Pumps 3 and 4 pipelines through a three-position spool dispenser 2 is connected with the rod and piston cavities of the cylinders 1 and with drain-off valve 10. The pump 5 piping is connected via a two-position distributor 10 with electromagnitism distributor 6. The last pipeline is connected with the end surfaces of the three-position valve 2 and with the sink.

The solenoid 8 solenoid valve 6 that controls the lifting body, through the control button 15, the contact 18 of the relay 17 is connected to the automotive electrical system of the vehicle. The solenoid 7 solenoid valve 6 that controls the lowering of the body, and the coil 19 of the relay 17 via button 13 control connected to the automotive electrical system of the vehicle, and through the switch 16 to control the drive of the truck, the diodes 22, the control button 14, the position sensor platform with the key 20 with control wiring and movement of the truck.

The hydraulic actuator operates as follows.

When driving the truck with lowered platform switch 16 applies a voltage to one of the diodes 22. The electromagnets 7 and 8 are de-energized, as the button 15 is open and the voltage from the switch 16 of the drive control and the diode 22 to the solenoid lowering of the platform 7 is not available as open key position sensor platform 20.

The working fluid from the pump 5 is supplied to the electromagnetic valve 6 and through the dip dispenser 10 to hydrocele Bolotnikova dispenser 2 pipework is supplied on the drain in the oil tank 11.

"Regular" mode of the lifting platform when the vehicle is stationary: the voltage on the electromagnet 8 of the lifting platform moves through the pressed button 15 and the normally closed contacts 18 of relay 17.

The electromagnet 8 moves the spool of the electromagnetic valve 6 in the leftmost position. Pipework from the pumps 3 and 4 is supplied to the piston cylinder cavity 1. Upon reaching in the pressure line of a certain pressure off the dispenser 10 is moved to its rightmost position. Pipework from the pump 5 is disconnected from the power steering 9 steering and connects to the pressure hydroline lifting platform. The lifting speed of the platform increases. The pipework from the rod ends of the cylinders 1 of the lifting and lowering of the platform is displaced by draining the oil tank 11. When you release the button 15, the electromagnet 8 is de-energized. The valve electrohydraulic valve 6 takes the middle position, the pressure oil from the left end of the cavity of the valve of the three-position valve 2 drops and the valve occupies the middle position. The piston cylinder chamber 1 is locked, locking the platform in the raised condition. The position sensor Pule: voltage on the electromagnet lowering of the platform 7 is fed through a pressed button 13. Relay 17 opens the contacts 18 and eliminates the electromagnet 8. The switch 16 is open.

The electromagnet 7 moves the spool of the electromagnetic valve 6 is in its rightmost position. Pipework from the pump 5 is supplied to the right end of the cavity of the three-position valve 2 and shifts its spool to the left. The rod end of the cylinders 1 of the lifting and lowering of the platform are connected by pumps 3 and 4, and the piston with the sink. Is forced lowering of the platform.

The movement of the truck with a raised platform. Buttons 13 and 15 are open. The switch 16 of the electric drive dump truck is included. The dump truck is moving forward (at one position of the switch 16 controls) or back (in a different position). The position sensor platform includes (closes) the switch 20 and the voltage from the switch 16 controls the drive of the truck through the diodes 22 button 14 is supplied to the electromagnet 7 lowering of the platform.

The capacitance 21 is charged to the supply voltage on-Board network. The platform begins to descend. As soon as the platform is lowered, the position sensor platform with the key 20 closes the power circuit elektromagnitnykh 14, which breaks the circuit of the electromagnet 7, the lowering of the platform.

The position sensor platform 20 disconnects the power supply circuit of the electromagnet 7, when between the platform and the frame of the truck is a certain gap. In order to relieve the hydraulic cylinders 7 and lower the platform completely on the frame, the electromagnet 7 is connected in parallel electrical capacity 21. After the interruption of the supply circuit of the electromagnet 7 electric capacity 21 supports it for some time, the voltage sufficient to hold the electromagnet 7 in vtyanuta condition. During this time the platform is fully manages to fall on the frame of the truck.

The movement of the truck when, for whatever reason, the platform begins to rise, for example, due to the inclusion of the button 15. When lifting platform position sensor platform connects the electromagnet 7 to the control switch actuator 16, and the switch 19 turns off the electromagnet 8 platform. As a result, the platform is lowered. As soon as the platform is lowered, the position sensor platform turns off the electromagnet 7, and the switch 19 connects the electromagnet 8. The platform begins to rise and fall to some small value. As to the electromagnet 7 stumps activate the electromagnet 8, as a result, the off time of the power steering is small and has virtually no effect on the handling of the truck when turning on the platform to rise.

The diodes 12 "cut" EMF-inductance arising from the shutdown of the electromagnets 7 and 8 and protects the contacts from the electrical erosion.

Thus, the proposed solution enables lowering of the platform during movement of the truck when the fault combined hydraulic actuator, causing spontaneous lifting platform, and reduces the off time of the power steering, which reduces the possibility of an emergency.

1. The HYDRAULIC TILTING MECHANISM of the VEHICLE containing the hydraulic cylinders raise and lower the platform, in communication with the pump and the oil tank on / off valve controlled by a solenoid valve with electric control system, containing the position sensor platform with managed key connecting the electromagnet lowering the platform with the switch drive control of the vehicle through the diodes, characterized in that the hydraulic drive is equipped with a relay, charlotina to the electromagnet lowering of the platform.

2. The hydraulic drive under item 1, characterized in that parallel to the electromagnet lowering platform connected electrical capacity.

 

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