CN209667193U - A kind of electric-controlled hydraulic steering valve group based on satellite navigation - Google Patents

Abstract

The utility model provides an electronically controlled hydraulic steering valve group based on satellite navigation. The valve group includes a proportional valve, a diverter valve, an overflow valve, a first shuttle valve, and a second shuttle valve. The two inlets of the first shuttle valve are respectively Connect the two outlets of the proportional valve, the outlet of the first shuttle valve is connected to an inlet of the second shuttle valve, the diverter valve adopts a three-way pressure compensator, and its remote control port is connected with the outlet of the second shuttle valve and the overflow valve; the valve group Ports A and B of the proportional valve are respectively connected to the two oil outlets of the proportional valve, port P is connected to the oil inlet port of the proportional valve and the diverter valve, port T is connected to the oil return port of the proportional valve and the diverter valve, and port EF is connected to the oil outlet of the diverter valve. The LS1 port is connected to another inlet of the second shuttle valve, and the LS2 port is connected to the outlet of the second shuttle valve. This valve group can be compatible with the full hydraulic steering gear, not only can be matched with the quantitative steering hydraulic system, but also can realize the matching of the variable steering hydraulic system; it can sense the driver's manual intervention in the steering, and send a signal to the automatic steering controller, Eliminate automatic control state.

Description

An electronically controlled hydraulic steering valve group based on satellite navigation

technical field

The utility model mainly relates to the field of hydraulic technology, in particular to an electronically controlled hydraulic steering valve group based on satellite navigation.

Background technique

At present, in the field of high-horsepower tractors, the steering system adopts a full-hydraulic steering gear, which is driven by the steering wheel. In the quantitative hydraulic system, the steering pump outputs hydraulic oil, and the hydraulic oil enters the steering cylinder through the steering gear to control the front of the tractor. The steering angle of the wheels. In the load-sensing variable hydraulic system, hydraulic oil is supplied to the steering gear through the load-sensing pump.

Satellite precise navigation of agricultural machinery requires that in the autonomous driving state, the steering cylinder is controlled by the electro-hydraulic steering valve group to achieve precise proportional control; when the driver is driving manually, the steering cylinder is controlled by the full hydraulic steering gear. Therefore, it is basically required that the electronically controlled hydraulic steering valve group is compatible with the original full hydraulic steering gear, which can not only meet the installation requirements of the variable system, but also meet the requirements of the quantitative system. However, in the prior art, there is no mature technology that can fully meet the above requirements.

Utility model content

In order to solve the deficiencies of the current technology, this utility model combines the existing technology and starts from practical application to provide an electronically controlled hydraulic steering valve group based on satellite navigation. This valve group can realize compatibility with the full hydraulic steering The matching of the quantitative steering hydraulic system can also realize the matching of the variable steering hydraulic system; it can sense the driver's manual intervention in steering and send a signal to the automatic steering controller to eliminate the automatic control state.

The technical scheme of the utility model is as follows:

An electronically controlled hydraulic steering valve group based on satellite navigation. The valve group includes a proportional valve, a diverter valve, an overflow valve, a first shuttle valve, and a second shuttle valve. The two inlets of the first shuttle valve are respectively connected to the ports of the proportional valve. Two outlets, the outlet of the first shuttle valve is connected to an inlet of the second shuttle valve, the diverter valve adopts a three-way pressure compensator, and its remote control port is connected to the outlet of the second shuttle valve and the overflow valve; the valve group is set to A and B , P, T, EF, LS1, and LS2 are 7 connecting oil ports, among which, A and B ports are respectively connected to the two oil outlet ports of the proportional valve, P port is connected to the proportional valve and the oil inlet port of the diverter valve, and T port is connected to The oil return port of the proportional valve and the overflow valve, the EF port is connected to the oil outlet of the diverter valve, the LS1 port is connected to the other inlet of the second shuttle valve, and the LS2 port is connected to the outlet of the second shuttle valve.

The EF port is provided with a first pressure switch for detecting the pressure of the port, and the LS1 port is provided with a second pressure switch for detecting the pressure of the port.

A first one-way valve is provided on the passage connecting the port A to the proportional valve, and a second one-way valve is provided on the passage connecting the port B to the proportional valve.

The proportional valve is a three-position four-way proportional valve.

The beneficial effects of the utility model:

The utility model provides an electronically controlled steering valve group for autonomous driving of tractors suitable for satellite navigation. The electronically controlled steering valve group is not only suitable for quantitative full hydraulic steering gear, but also suitable for load sensitive variable type full hydraulic steering gear. Wide compatibility; the electronically controlled steering valve group can detect the working state of the full hydraulic steering gear by setting the pressure switch, which is convenient for automatic control of the autonomous driving system; the electronically controlled valve group can ensure that the working pressure of the oil pump is only lower than that of the steering cylinder The working pressure is higher than that of a spring, and the setting pressure of a spring is about 0.7 bar, which reduces heat generation and realizes energy saving.

Description of drawings

Figure 1 is a schematic diagram of the electronically controlled hydraulic steering valve group.

Figure 2 is a connection diagram compatible with the quantitative full hydraulic steering gear.

Figure 3 is a connection diagram compatible with the load-sensitive full hydraulic steering gear.

Labels shown in the accompanying drawings:

1. Proportional valve; 2. Diverter valve; 3. Relief valve; 4. Second shuttle valve; 5. First shuttle valve; 6. First one-way valve; 7. Second one-way valve; 8. First Pressure switch; 9. Second pressure switch; 10. Full hydraulic steering gear; 11. Steering priority valve; 12. Steering oil cylinder; 13. Electric control steering valve group.

Detailed ways

The utility model will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. In addition, it should be understood that those skilled in the art may make various changes or modifications to the utility model after reading the content taught by the utility model, and these equivalent forms also fall within the scope defined in the application.

As shown in Figure 1, it is the electronically controlled hydraulic proportional valve group structure of the utility model. This valve group is designed with composite sensitive technology, and consists of a three-position four-way proportional valve 1, a diverter valve 2, an overflow valve 3, and a first shuttle valve. 5. The second shuttle valve 4, the first one-way valve 6, the second one-way valve 7, the first pressure switch 8, and the second pressure switch 9; the valve group is equipped with 7 connecting oil ports, respectively: A port, B port The P port is used to connect the steering cylinder, the P port is used to connect the steering pump oil outlet, and the T port is used to connect the tractor steering cylinder; in the quantitative system, LS1 and LS2 are plugged with screw plugs, and the EF port is connected to the steering gear inlet of the tractor. Oil port, in the variable system, the EF port is plugged with a plug, LS1 is connected to the full hydraulic steering gear LS, and LS2 is connected to the normal variable pump LS port.

Basic principle: The hydraulic oil enters the valve group from the P port, and the three-position four-way proportional valve 1 is used to realize the variable proportional control of the A port and the B port. 6. Under the action of the second one-way valve 7, the hydraulic oil in the oil cylinder will not flow into the electronically controlled steering valve in reverse. This technology uses a three-way pressure compensator as the diverter valve 2. First, its remote control port is connected to the second shuttle valve 4 through a damping hole. The first shuttle valve 5 and the second shuttle valve 4 act on the diverter after selecting the highest pressure of the load The remote control port of valve 2, the oil inlet port of diverter valve 2 is connected with the oil inlet port of proportional valve 1, so when proportional valve 1 is energized to work, the pressure difference between the oil inlet port and oil outlet port is equal to the pressure of the diverter valve spring, basically Keeping the same, the flow rate of proportional valve 1 is only related to the size of the opening, and has nothing to do with the change of the load pressure. Second, in the quantitative system, the diverter valve 2 diverts the excess flow to other circuits.

The electronically controlled steering valve group is provided with a first pressure switch 8 and a second pressure switch 9 to respectively detect the pressure at the EF port and the pressure at the LS1 port. In the quantitative system, the EF port is connected to the oil inlet port of the full hydraulic steering gear. When the steering wheel is manually operated, the EF port is in a high pressure state, and the first pressure switch 8 has a high voltage electrical signal output; in the load sensitive variable system, the LS1 port is connected to the steering gear LS. When the steering wheel is manually operated, LS1 presents a high-voltage state, and the second pressure switch 9 has a high-voltage electrical signal output. When the first pressure switch 8 or the second pressure switch 9 has a high-pressure signal output, the navigation controller is notified, and the output is controlled to de-energize the electronically controlled steering valve group.

Embodiment 1: As shown in Figure 2, it is a compatible connection system between the valve group and the quantitative full hydraulic steering gear. , B are connected to ports A and B of the steering cylinder 12 through the tee, the EF port of the electronically controlled steering valve group 13 is connected to the P port of the full hydraulic steering gear 10, and the oil outlet of the oil pump is connected to the port of the electronically controlled steering valve group 13. P port connection, the oil return port T of the electronically controlled steering valve group 13 and the oil return port T of the full hydraulic steering gear 10 are connected in parallel through a tee and then returned to the oil tank, and the LS1 and LS2 oil ports of the electronically controlled steering valve group 13 are blocked with plugs .

When the satellite navigation autonomous driving system is in the state of automatic driving, the driver does not operate the steering wheel. At this time, the full hydraulic steering gear 10 is in the neutral state, the P port and the T port are connected, and the full hydraulic steering gear 10 is in the unloaded state. Ports A and B are in cut-off state. At this time, the satellite navigation autonomous driving system outputs instructions, and the electronically controlled steering valve group 13 is energized, and the electronically controlled steering valve group 13 controls the steering cylinder 12, and the full hydraulic steering gear 10 does not work; when the driver manually operates the steering wheel, the fully hydraulic steering The steering gear 10 is in the left or right position, the P port is in a high pressure state, the first pressure switch 8 of the electronically controlled steering valve group 13 detects that the EF port is in a high pressure state, and the controller of the satellite navigation autonomous driving system detects that the first pressure switch 8 The high-pressure state signal automatically cancels the control of the electronically controlled steering valve group 13, and the system is out of the automatic driving state. Port B is in the cut-off state, and at this time, the full hydraulic steering gear 10 controls the action of the steering cylinder 12 .

Embodiment 2: As shown in Figure 3, it is a system compatible with the utility model and the load-sensitive full hydraulic steering gear. In this system, the oil ports A and B of the electric control steering valve group 13, the A and B oil ports of the full hydraulic steering gear 10 are connected with the A and B oil ports of the steering cylinder 12 through a tee, and the oil ports of the electric control steering valve group 13 are The P port is connected to the P port of the full hydraulic steering gear 10 through a three-way connection with the CF port of the steering priority valve 11, and the oil return port T of the electronically controlled steering valve group 13 is connected in parallel with the oil return port T of the full hydraulic steering gear 10 through a three-way connection. Back to the oil tank, the LS1 port of the electronically controlled steering valve group 13 is connected to the LS port of the full hydraulic steering gear 10, the LS2 of the electronically controlled steering valve group 13 is connected to the LS port of the steering priority valve 11, and the EF port of the electronically controlled steering valve group 13 is connected to the oil tank. The mouth was blocked with a silk plug.

When the satellite navigation autonomous driving system is in the automatic driving state and the driver does not operate the steering wheel, the load-sensitive full hydraulic steering gear 10 is in the neutral state, its A and B ports are cut off, and the P and T ports are in a high-resistance state. The hydraulic oil flow rate of the full hydraulic steering gear 10 is close to zero. At this time, the satellite navigation autonomous driving system outputs instructions, and the electronically controlled steering valve group 13 is energized, and the electronically controlled steering valve group 13 controls the steering cylinder 12. When the steering wheel is in the left or right position, the hydraulic oil passes through the EF port of the steering priority valve 11 to other hydraulic oil circuits; when the driver manually operates the steering wheel, the full hydraulic steering gear 10 is in the left or right position, and the P port is in a high pressure state. The second pressure switch 9 of 13 detects that the LS1 port is in a high-pressure state, and the controller of the satellite navigation autonomous driving system detects the high-pressure state signal of the first pressure switch 8, automatically cancels the control of the electronically controlled steering valve, and the system is out of the automatic driving state. Under the action of the first one-way valve 6 and the second one-way valve 7, the ports A and B of the electronically controlled steering valve are in the cut-off state. At this time, the full hydraulic steering gear 13 controls the action of the steering cylinder 12.

Claims (4)

1. An electronically controlled hydraulic steering valve group based on satellite navigation, characterized in that: the valve group includes a proportional valve, a diverter valve, an overflow valve, a first shuttle valve, a second shuttle valve, two of the first shuttle valve The inlets are respectively connected to two outlets of the proportional valve, the outlet of the first shuttle valve is connected to an inlet of the second shuttle valve, the diverter valve adopts a three-way pressure compensator, and its remote control port is connected to the outlet of the second shuttle valve and the overflow valve; The valve group is equipped with 7 connection ports of A, B, P, T, EF, LS1 and LS2, among which, A and B ports are respectively connected to the two oil outlet ports of the proportional valve, and P port is connected to the inlet port of the proportional valve and the diverter valve. The oil port, the T port is connected to the oil return port of the proportional valve and the relief valve, the EF port is connected to the oil outlet of the diverter valve, the LS1 port is connected to the other inlet of the second shuttle valve, and the LS2 port is connected to the outlet of the second shuttle valve. 2. An electronically controlled hydraulic steering valve group based on satellite navigation according to claim 1, characterized in that: said EF port is provided with a first pressure switch for detecting the pressure of the port, and said LS1 port is There is a second pressure switch for detecting the pressure of the port. 3. An electronically controlled hydraulic steering valve group based on satellite navigation as claimed in claim 1, wherein a first check valve is provided on the channel connecting the port A to the proportional valve, and the port B is connected to the proportional valve. The channel connected to the proportional valve is provided with a second one-way valve. 4. The electronically controlled hydraulic steering valve group based on satellite navigation according to claim 1, wherein the proportional valve is a three-position four-way proportional valve.