A remote control loader hydraulic system and a remote control loader

Abstract

This invention discloses a hydraulic system and a remote-controlled loader in the field of remote-controlled loader technology. The hydraulic system includes a gear pump, a steering control valve, a steering gear, and a steering cylinder. The outlet of the gear pump is connected to the P port of the steering control valve, and the P1 port of the steering control valve is connected to the P port of the steering gear. The R and L ports of the steering control valve are respectively connected to the steering cylinder. The R and L ports of the steering gear are also connected to the steering cylinder. The steering control valve is equipped with a steering lever and a steering button. The steering button is used to switch the working mode of the remote-controlled loader to manual mode or electric control mode, and the steering lever is used to control the steering of the remote-controlled loader in electric control mode. The steering control valve and the hydraulic system of the remote-controlled loader described in this invention have the characteristics of simple structure, flexible control, low manufacturing and use cost, and suitability for the electrification and large-scale application of loader steering systems.

Description

Technical Field

[0001] This invention belongs to the field of remote control loader technology, specifically relating to a hydraulic system for a remote control loader and a remote control loader. Background Technology

[0002] Due to the extremely harsh working environment, and out of concern for safety, the government has mandated that all mining underground loaders must be equipped with wirelessly remote-controlled vehicles for underground operations. However, the steering control system of current remote-controlled loaders is relatively expensive, hindering their large-scale adoption. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a remote-controlled loader hydraulic system and a remote-controlled loader, which features a simple structure, flexible control, low manufacturing and operating costs, and suitability for the electrification of loader steering systems and large-scale application.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, a hydraulic system for a remote-controlled loader is provided, comprising a gear pump, a steering control valve, a steering gear, and a steering cylinder; the outlet of the gear pump is connected to the P port of the steering control valve, and the P1 port of the steering control valve is connected to the P port of the steering gear; the R and L ports of the steering control valve are respectively connected to the steering cylinder; the R and L ports of the steering gear are respectively connected to the steering cylinder; the steering control valve is equipped with a steering lever and a steering button, the steering button being used to switch the operating mode of the remote-controlled loader to manual mode or electric control mode, and the steering lever being used to control the remote-controlled loader to steer in electric control mode.

[0006] Further, the steering control valve includes a control valve, an electro-proportional directional valve, a solenoid switching valve, and a relief valve; the oil inlet of the control valve and the P port of the electro-proportional directional valve are respectively connected to the P port of the steering control valve; the oil outlet of the control valve is respectively connected to the P1 port and the M port of the steering control valve; the LS port of the electro-proportional directional valve is respectively connected to the control terminal X2 of the control valve and the oil inlet of the relief valve; the working oil port of the electro-proportional directional valve is connected to the oil inlet of the solenoid switching valve; the oil outlet of the solenoid switching valve is connected to the R port and the L port of the steering control valve; the electric steering handle is electrically connected to the solenoids WA2 and WA1 of the electro-proportional directional valve, and the steering button is electrically connected to the solenoid WA3 of the solenoid switching valve.

[0007] Furthermore, in manual mode, without operating the steering lever and steering button, the solenoids WA1 and WA2 of the electro-proportional directional valve and the solenoid WA3 of the solenoid switching valve are not energized. The electro-proportional directional valve is in the neutral O-type function, and there is no oil pressure signal at the LS port of the electro-proportional directional valve. The oil pressure from the gear pump acts on the X1 end of the control valve. Compared with the oil pressure signal and spring force acting on the X2 end of the control valve at the LS port, the oil pressure increases, overcoming the spring force at the X2 end of the control valve. The valve core moves to the right, and the P port of the steering control valve connects with the P1 port. At this time, when the steering wheel of the steering gear is operated, hydraulic oil enters the steering cylinder through the L port or R port of the steering gear to achieve steering.

[0008] Further, press the steering button to enter the electronic control mode. In the electronic control mode, the solenoid WA3 of the solenoid switching valve is energized. When turning left, push the steering lever to the L position, the solenoid WA2 of the solenoid switching valve is energized, and the hydraulic oil output by the gear pump enters the steering cylinder through the electro-proportional directional valve and the solenoid switching valve to achieve left turn; conversely, push the steering lever to the R position to achieve right turn. At this time, the control valve is disconnected under the action of the oil pressure at both ends of the control valve X1 and X2 and the spring force at the end of the control valve X2, and the P port and P1 port of the steering control valve are not connected.

[0009] Furthermore, the method for setting the spring force at the X2 end of the control valve is as follows: In the electronic control mode, ΔP = P0 - LS0, and the spring force F at the X2 end of the control valve is greater than ΔP; where P0 is the outlet hydraulic oil pressure of the gear pump; and LS0 is the hydraulic oil pressure at the LS port of the electro-proportional directional valve.

[0010] Furthermore, the electro-proportional directional valve achieves proportional control of valve core opening by controlling the magnitude of the current, which is used to control the steering speed.

[0011] Furthermore, the M port of the steering control valve is connected to a pressure switch, and the pressure switch is electrically connected to the electromagnet WA3 of the electromagnetic switching valve, and the electro-proportional directional valve's electromagnets WA2 and WA1, respectively.

[0012] Furthermore, the electro-proportional directional valve is a three-position five-way solenoid directional valve.

[0013] Furthermore, the electromagnetic switching valve is a two-position four-way electromagnetic valve.

[0014] In a second aspect, a remote-controlled loader is provided, the remote-controlled loader being equipped with the remote-controlled loader hydraulic system described in the first aspect.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention replaces the priority valve in the traditional loader steering system with a steering control valve, thereby realizing the electrification of the loader steering system on the basis of the original steering mode; it has the characteristics of simple structure, flexible control, low manufacturing and use cost, and is suitable for the electrification and large-scale promotion and application of loader steering systems. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hydraulic system of a remote-controlled loader provided in an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A schematic diagram of the steering control valve.

[0018] In the diagram: 1. Gear pump; 2. Steering control valve; 3. Steering gear; 4. Steering cylinder; 5. Control valve; 6. Electro-proportional directional valve; 7. Solenoid switching valve; 8. Relief valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] Example 1:

[0021] like Figure 1 , Figure 2 As shown, a hydraulic system for a remote-controlled loader includes a gear pump 1, a steering control valve 2, a steering gear 3, and a steering cylinder 4. The outlet of the gear pump 1 is connected to the P port of the steering control valve 2, and the P1 port of the steering control valve 2 is connected to the P port of the steering gear 3. The R and L ports of the steering control valve 2 are respectively connected to the steering cylinder 4. The R and L ports of the steering gear 3 are respectively connected to the steering cylinder 4. The steering control valve 2 is equipped with a steering lever and a steering button. The steering button is used to switch the working mode of the remote-controlled loader to manual mode or electric control mode, and the steering lever is used to control the remote-controlled loader to steer in electric control mode.

[0022] The steering control valve 2 includes a control valve 5, an electro-proportional directional valve 6, a solenoid switching valve 7, a relief valve 8, a P port for connecting to the hydraulic oil supply line (the hydraulic oil supply line connects to the outlet of gear pump 1), an M port for connecting to the pressure switch, an auxiliary oil port P1, a T port for connecting to the hydraulic oil tank, and R and L ports for connecting to the steering cylinder 4. The control valve 5 is a two-position two-way directional valve, with its two control chambers connected to the outlet of the control valve 5 and the LS port of the electro-proportional directional valve 6, respectively. The electro-proportional directional valve 6 is a three-position five-way solenoid directional valve, including the LS port in addition to the P, T, A, and B ports, with a neutral position function of type O. The solenoid switching valve 7 is a two-position four-way solenoid valve, including the A, B, L, and R ports. The relief valve 8 is connected to the LS port of the electro-proportional directional valve 6.

[0023] The electric steering lever is electrically connected to the solenoids WA2 and WA1 of the electric proportional directional valve 6, and the steering button is electrically connected to the solenoid WA3 of the solenoid switching valve 7.

[0024] The steering lever is a single-position three-position lever (LOR). The L position energizes electromagnet WA2, the R position energizes electromagnet WA1, and the O position de-energizes both electromagnets WA1 and WA2. The steering buttons are two-position buttons (SO). When the S position button is pressed, electromagnet WA3 is energized; when the O position button is reset, electromagnet WA3 is de-energized.

[0025] The oil inlet of control valve 5 and the P port of electro-proportional directional valve 6 are connected to the P port of steering control valve 2, respectively; the oil outlet of control valve 5 is connected to the P1 port and M port of steering control valve 2, respectively; the LS port of electro-proportional directional valve 6 is connected to the X2 end of control valve 5 and the oil inlet of relief valve 8, respectively; the working oil port of electro-proportional directional valve 6 is connected to the oil inlet of solenoid switching valve 7; the oil outlet of solenoid switching valve 7 is connected to the R port and L port of steering control valve 2; the T port of electro-proportional directional valve 6 and the T port of relief valve 8 are connected to the T port of steering control valve 2, respectively.

[0026] The M port of the steering control valve 2 is connected to a pressure switch, which is electrically connected to the control terminal WA3 of the solenoid switching valve 7 and the control terminals WA2 and WA1 of the electro-proportional directional valve 6, respectively.

[0027] The relief valve 8 is connected to the LS port of the electro-proportional directional valve 6. The electro-proportional directional valve 6 is a three-position five-way solenoid directional valve, which includes the LS port in addition to the P, T, A, and B ports. The solenoid switching valve 7 is a two-position four-way solenoid valve, which includes the A, B, L, and R ports.

[0028] The remote-controlled loader hydraulic system described in this embodiment includes two steering control modes: manual mode and electronic control mode. The two steering modes can be interlocked.

[0029] In manual mode, hydraulic steering is manually controlled by manipulating the steering wheel of steering gear 3. At this time, the electro-proportional directional valve 6 is in the neutral position, and the oil pressure from gear pump 1 acts on the X1 end of control valve 5, causing the valve core to move to the right. Oil from the gear pump flows through control valve 5 from port P1 to port P of steering gear 3. Steering gear 3 is in the neutral position and the oil flows from P to T. When the steering wheel of steering gear 3 is turned left, oil from port P1 of control valve 5 flows from port P to port L of steering gear 3, entering steering cylinder 4 to achieve left steering. When the steering wheel of steering gear 3 is turned right, oil from port P1 of control valve 5 flows from port P to port R of steering gear 3, entering steering cylinder 4 to achieve right steering. Simultaneously, the pressure switch, upon detecting the steering pressure signal at port P1 of control valve 5, automatically cuts off the current signals to the electromagnets WA1, WA2, and WA3 of electro-proportional directional valve 6 to prevent accidental operation of the electronic steering system during manual steering.

[0030] When remote control steering is required downhole, pressing the steering button energizes the WA3 electromagnet, activating the electronic control mode. To turn left, push the steering lever to the L position, energizing the WA2 electromagnet. Oil from gear pump 1 flows through the P port to the L port of steering control valve 2 into steering cylinder 4, achieving a left turn. To turn right, push the steering lever to the R position, energizing the WA1 electromagnet. Oil from gear pump 1 flows through the P port to the R port of steering control valve 2 into steering cylinder 4, achieving a right turn. During steering, the electro-proportional directional valve 6 introduces oil pressure from port P to port LS into the X2 terminal of control valve 5, causing the valve core to move to the left, thereby cutting off the oil flow from port P to port P1 of steering control valve 2, preventing manual steering during electronic steering.

[0031] The method for setting the spring force at the X2 end of the control valve is as follows: In electronic control mode, ΔP = P0 - LS0, and the spring force F at the X2 end of the control valve is greater than ΔP; where P0 is the outlet hydraulic oil pressure of the gear pump; and LS0 is the hydraulic oil pressure at the LS port of the electro-proportional directional valve. This setting ensures that the P port of steering control valve 2 is not connected to the P1 port of steering control valve 2.

[0032] The electro-proportional directional valve 6 can control the proportional opening of the valve core by controlling the magnitude of the current, thereby controlling the steering speed and achieving the same effect as controlling the steering speed by operating the steering wheel.

[0033] The electric steering mode is also equipped with a safety protection function to prevent accidental contact with the steering lever. The steering control valve 2 is equipped with an electromagnetic switching valve 7. When the steering button is pressed, the WA3 electromagnet of the electromagnetic switching valve 7 is energized, and the electromagnetic switching valve 7 is in the on position, so that electric steering can be realized.

[0034] Example 2:

[0035] Based on the remote-controlled loader hydraulic system described in Embodiment 1, this embodiment provides a remote-controlled loader equipped with the remote-controlled loader hydraulic system described in Embodiment 1.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic system for a remote-controlled loader, characterized in that, Includes a gear pump (1), a steering control valve (2), a steering gear (3), and a steering cylinder (4); The oil outlet of the gear pump (1) is connected to the P port of the steering control valve (2), and the P1 port of the steering control valve (2) is connected to the P port of the steering gear (3); the R port and L port of the steering control valve (2) are connected to the steering cylinder (4) respectively; the R port and L port of the steering gear (3) are connected to the steering cylinder (4) respectively. The steering control valve (2) is equipped with a steering electric handle and a steering button. The steering button is used to switch the working mode of the remote loader to manual mode or electric control mode. The steering electric handle is used to control the remote loader to steer in electric control mode. The steering control valve (2) includes a control valve (5), an electro-proportional directional valve (6), a solenoid switching valve (7), and a relief valve (8). The oil inlet of the control valve (5) and the P port of the electro-proportional directional valve (6) are respectively connected to the P port of the steering control valve (2); the oil outlet of the control valve (5) is respectively connected to the P1 port and the M port of the steering control valve (2); the LS port of the electro-proportional directional valve (6) is respectively connected to the control terminal X2 of the control valve (5) and the oil inlet of the relief valve (8); the working oil port of the electro-proportional directional valve (6) is connected to the oil inlet of the solenoid switching valve (7); the oil outlet of the solenoid switching valve (7) is connected to the R port and the L port of the steering control valve (2); The electric steering handle is electrically connected to the electromagnets WA2 and WA1 of the electric proportional directional valve (6), and the steering button is electrically connected to the electromagnet WA3 of the electromagnetic switching valve (7). In manual mode, without operating the steering lever and steering button, the electro-proportional directional valve (6) electro-coil WA1 and WA2 and the electro-coil switching valve (7) electro-coil WA3 are not energized. The electro-proportional directional valve (6) is in the neutral O-type function. There is no oil pressure signal at the LS port of the electro-proportional directional valve (6). The oil pressure from the gear pump (1) acts on the X1 end of the control valve (5). Compared with the oil pressure signal and spring force at the LS port of the X2 end of the control valve (5), the oil pressure increases to overcome the spring force at the X2 end of the control valve (5). The valve core moves to the right, and the P port of the steering control valve (2) connects with the P1 port. At this time, when the steering wheel of the steering gear (3) is operated, the hydraulic oil enters the steering cylinder (4) through the L port or R port of the steering gear (3) to achieve steering.

2. The remote-controlled loader hydraulic system according to claim 1, characterized in that, Press the steering button to enter the electronic control mode. In the electronic control mode, the electromagnet WA3 of the electromagnetic switching valve (7) is energized. When turning left, push the steering handle to the L position, the electromagnet WA2 of the electromagnetic switching valve (7) is energized, and the hydraulic oil output by the gear pump (1) enters the steering cylinder (4) through the electro-proportional directional valve (6) and the electromagnetic switching valve (7) to achieve left turn; conversely, push the steering handle to the R position to achieve right turn; at this time, the control valve (5) is disconnected under the action of the oil pressure at both ends of the control valve (5) X1 and X2 and the spring force at the end of the control valve (5), and the P port and P1 port of the steering control valve (2) are not connected.

3. The remote-controlled loader hydraulic system according to claim 1 or 2, characterized in that, The method for setting the spring force at the X2 end of the control valve (5) is as follows: In the electronic control mode, △P=P0-LS0, and the spring force F at the X2 end of the control valve (5) is greater than △P; Wherein, P0 is the outlet hydraulic oil pressure of the gear pump (1); LS0 is the hydraulic oil pressure at the LS port of the electro-proportional directional valve (6).

4. The remote-controlled loader hydraulic system according to claim 1, characterized in that, The electro-proportional directional valve (6) controls the valve core opening proportionally by controlling the magnitude of the current, and is used to control the steering speed.

5. The remote-controlled loader hydraulic system according to claim 1, characterized in that, The M port of the steering control valve (2) is connected to a pressure switch, and the pressure switch is electrically connected to the electromagnet WA3 of the electromagnetic switching valve (7), the electromagnets WA2 and WA1 of the electro-proportional directional valve (6), respectively.

6. The remote-controlled loader hydraulic system according to claim 1, characterized in that, The electro-proportional directional valve (6) is a three-position five-way solenoid directional valve.

7. The remote-controlled loader hydraulic system according to claim 1, characterized in that, The electromagnetic switching valve (7) is a two-position four-way electromagnetic valve.

8. A remote-controlled loader, characterized in that, The remote-controlled loader is equipped with the remote-controlled loader hydraulic system as described in any one of claims 1 to 7.

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