A logic controller, hydraulic steering system and movable platform

Abstract

The application provides a logic controller, a hydraulic steering system and a movable platform, which comprises a first shuttle valve, a second shuttle valve and a third shuttle valve. One end of the first shuttle valve is used for connecting a work device control signal port of the movable platform, and the other end of the first shuttle valve is used for connecting a farm implement control signal port. One end of the second shuttle valve is used for connecting a signal port of a manual steering gear, and the other end of the second shuttle valve is used for connecting a signal port of an automatic steering gear. The signal port of the first shuttle valve and the signal port of the second shuttle valve are respectively connected to two ends of the third shuttle valve. The signal port of the third shuttle valve is used for connecting a signal port of a load-sensitive variable pump. The load-sensitive variable pump can adjust the oil output in real time according to the change of the hydraulic feedback signal, can supply oil according to demand, and can achieve the purpose of energy saving. By adjusting the flow size of the oil output, the steering response speed of the tractor can be improved, the operation experience of the user can be ensured, and the production efficiency can be improved.

Claims

1. A hydraulic steering system, characterized in that, The hydraulic steering system includes a manual steering gear, an automatic steering gear, a load-sensitive variable pump, and a logic controller, wherein the logic controller includes a first shuttle valve, a second shuttle valve, and a third shuttle valve; One end of the first shuttle valve is used to connect to the working device control signal port of the movable platform, and the other end of the first shuttle valve is used to connect to the agricultural machinery control signal port. One end of the second shuttle valve is connected to the signal port of the manual steering gear, and the other end of the second shuttle valve is connected to the signal port of the automatic steering gear. The signal ports of the first shuttle valve and the second shuttle valve are respectively connected to the two ends of the third shuttle valve, and the signal port of the third shuttle valve is connected to the signal port of the load-sensitive variable pump. The first oil outlet of the manual steering gear is used to connect with the left steering oil chamber of the movable platform, the second oil outlet of the manual steering gear is used to connect with the right steering oil chamber of the movable platform, the third oil outlet of the automatic steering gear is used to connect with the left steering oil chamber, and the fourth oil outlet of the automatic steering gear is used to connect with the right steering oil chamber. The load-sensitive variable pump is used to adjust the output flow rate according to the hydraulic feedback signal from its signal port to supply oil to the manual steering gear and the automatic steering gear; The hydraulic steering system also includes a steering priority valve, and the signal port of the second shuttle valve is also connected to the signal port of the steering priority valve; The suction port of the load-sensitive variable pump is connected to the hydraulic oil tank, and the discharge port of the load-sensitive variable pump is connected to the inlet of the steering priority valve. The steering priority valve's steering outlet is connected to the inlet of the manual steering gear and the inlet of the automatic steering gear, respectively, and the working outlet of the steering priority valve is connected to the main oil supply circuit of the working device and the main oil supply circuit of the agricultural machinery, respectively. The steering priority valve is used to adjust the oil supply ratio between the steering outlet and the working outlet based on the hydraulic feedback signal from its signal port.

2. The hydraulic steering system as described in claim 1, characterized in that, The logic controller also includes a pressure stabilizing valve, and the signal port of the second shuttle valve is also connected to one end of the pressure stabilizing valve.

3. The hydraulic steering system as described in claim 1, characterized in that, The return ports of the manual steering gear and the automatic steering gear are connected to the return ports of the hydraulic oil tank.

4. A mobile platform, characterized in that, The movable platform includes the hydraulic steering system as described in any one of claims 1-3.

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