People-electricity double-control steering hydraulic system of electric wheel dumper

Abstract

The utility model relates to the technical field of steering hydraulic control, in particular to a man-electric double-control steering hydraulic system of an electric wheel dumper. A first electric proportional coil and a second electric proportional coil of the electric proportional reversing valve are respectively connected with a controller, the controller is connected with an electronic steering gear, and the electronic steering gear is connected with a steering wheel through a steering column; the electric proportional reversing valve is respectively connected with the hydraulic oil tank, the conversion valve group and the balance valve; the hydraulic oil tank is connected with the conversion valve group sequentially through the oil suction filter, the hydraulic pump and the high-pressure filter; the steering valve group is connected with a steering energy accumulator and is connected with a pressure sensor through a pressure measuring pipeline; the balance valve is connected with a steering oil cylinder through a shunting block; the steering oil cylinder is connected with a steering wheel through a steering axle mechanism; wherein the steering axle mechanism is provided with a steering angle sensor, and the steering wheel is provided with a vehicle speed sensor; the controller controls the pressure sensor, the rotation angle sensor and the vehicle speed sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of steering hydraulic control, in particular to a human-electric dual-control steering hydraulic system for an electric wheel dump truck. Background Art

[0002] Off-road electric wheel mining dump trucks are mainly composed of diesel engines, generators, electric wheels, electronic control systems, hydraulic systems, frames, suspensions, and carriages. The hydraulic system is divided into several parts, such as steering, lifting, and braking. The steering hydraulic system is an important part of the vehicle. At present, the steering hydraulic system of mining dump trucks generally consists of hydraulic oil tanks, hydraulic pumps, filters, steering valve blocks, accumulators, steering gears, flow amplifiers, steering cylinders, hydraulic pipelines, etc. The steering system is required to be safe, reliable, and comfortable to operate. The steering hydraulic system of electric wheel dump trucks should also be equipped with an emergency steering device.

[0003] With the development of technology and the current requirements of safety and personnel, unmanned driving has become the development direction. At present, the steering system for manned and unmanned driving generally adopts a hydraulic steering gear with an integrated electric proportional valve. This steering system has high cost, long delivery time, and technical barriers. In addition, since it is an integrated device, if a part is damaged, the entire integrated component must be replaced, and the repair and replacement technology is complex and the maintenance cost is high.

[0004] Therefore, there is an urgent need for a human-electric dual-control steering hydraulic system to solve the problems of high replacement cost and complex maintenance technology caused by the hydraulic steering gear using an integrated electric proportional valve. Utility Model Content

[0005] The purpose of the utility model is to provide a human-electric dual-control steering hydraulic system for an electric wheel dump truck in response to the defects existing in the above-mentioned prior art. Compared with the hydraulic steering gear with integrated electric proportional valve in the prior art, an electro-hydraulic proportional reversing valve (electric proportional reversing valve) and an electronic steering gear are used instead, and hydraulic components such as the hydraulic steering gear and the flow amplifier are eliminated, so that the hydraulic system of the whole machine is simpler and more reliable, the risk of leakage is reduced, the hydraulic pulsation and the noise in the cab are greatly reduced, the system has a longer service life and high reliability, is convenient for maintenance, reduces maintenance costs, and is safe and reliable in structure.

[0006] The utility model provides a human-electric dual-control steering hydraulic system for an electric wheel dump truck, the system comprising: an electric proportional reversing valve; a first electric proportional coil and a second electric proportional coil of the electric proportional reversing valve are respectively connected to a controller, the controller is connected to an electronic steering gear, and the electronic steering gear is connected to a steering wheel through a steering column; the electric proportional reversing valve is respectively connected to a hydraulic oil tank, a steering valve group and a balancing valve; the hydraulic oil tank is connected to the steering valve group via an oil suction filter, a hydraulic pump and a high-pressure filter in sequence; the steering valve group is connected to a steering accumulator, and is connected to a pressure sensor via a pressure measuring pipeline; the balancing valve is connected to a steering cylinder via a diverter block, and the steering cylinder is connected to a steering wheel via a steering axle mechanism; wherein the steering axle mechanism is provided with a rotation angle sensor, and the steering wheel is provided with a vehicle speed sensor; the controller controls the pressure sensor, the rotation angle sensor and the vehicle speed sensor respectively.

[0007] Furthermore, the electric proportional reversing valve is provided with an oil return port and an oil inlet port, and the steering valve group is provided with an oil supply port; the oil return port of the electric proportional reversing valve is connected to the hydraulic oil tank, and the oil inlet port is connected to the oil supply port of the steering valve group.

[0008] Furthermore, the electric proportional reversing valve is also provided with a first oil outlet and a second oil outlet; the balancing valve includes a first balancing valve and a second balancing valve; the first balancing valve and the second balancing valve are both provided with an oil inlet; the first oil outlet of the electric proportional reversing valve is connected to the oil inlet of the first balancing valve, and the second oil outlet is connected to the oil inlet of the second balancing valve.

[0009] Furthermore, the hydraulic pump is provided with an oil suction port and an oil outlet, the high-pressure filter is provided with an oil inlet and an oil outlet, and the steering valve group is also provided with an oil inlet; the hydraulic oil tank is connected to the oil suction filter, the oil suction filter is connected to the oil suction port of the hydraulic pump, the oil outlet of the hydraulic pump is connected to the oil inlet of the high-pressure filter, and the oil outlet of the high-pressure filter is connected to the oil inlet of the steering valve group.

[0010] Furthermore, the steering valve group is also provided with a first filling port of the steering accumulator, a second filling port of the steering accumulator, a pressure relief port and a pressure measuring port; the steering accumulator includes a first accumulator and a second accumulator; the first filling port of the steering accumulator on the steering valve group is connected to the first accumulator, the second filling port of the steering accumulator is connected to the second accumulator, the pressure relief port is connected to the hydraulic oil tank, and the pressure measuring port is connected to the pressure sensor through a pressure measuring pipeline.

[0011] Furthermore, the steering cylinder includes a first steering cylinder and a second steering cylinder; the first balancing valve and the second balancing valve are also provided with an oil outlet; the oil outlet of the first balancing valve is connected to the rodless chamber of the first steering cylinder and the rod chamber of the second steering cylinder; the oil outlet of the second balancing valve is connected to the rod chamber of the first steering cylinder and the rodless chamber of the second steering cylinder.

[0012] Furthermore, in the steering valve group, a pressure relief solenoid valve is also provided on the pipeline between the oil supply port and the pressure relief port.

[0013] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It shows the overall structural schematic diagram of a human-electric dual-control steering hydraulic system of an electric wheel dump truck of the utility model;

[0015] Figure 2 The schematic diagram of the partial structure of the steering wheel 1, the electronic steering gear 2, the controller 3 and the electric proportional reversing valve 4 of the human-electric dual-control steering hydraulic system of an electric wheel dump truck of the utility model is shown;

[0016] Figure 3 A partial structural schematic diagram of a balance valve 12 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck according to the utility model is shown;

[0017] Figure 4 It shows a partial structural schematic diagram of a hydraulic oil tank 5, an oil suction filter 6, a hydraulic pump 7 and a high-pressure filter 8 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck of the utility model;

[0018] Figure 5 It shows a partial structural schematic diagram of a steering valve group 9, a steering accumulator 10 and a pressure sensor 11 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck of the utility model;

[0019] Figure 6 A partial structural schematic diagram of a steering angle sensor 13, a vehicle speed sensor 14, a steering cylinder 15, a steering wheel 16 and a diverter block 17 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck according to the utility model is shown.

[0020] Figure numerals: 1-steering wheel, 2-electronic steering gear, 3-controller, 4-electric proportional reversing valve, SV1-first electric proportional coil, SV2-second electric proportional coil, 5-hydraulic oil tank, 6-oil suction filter, 7-hydraulic pump, 8-high pressure filter, 9-steering valve group, 9.1-pressure release solenoid valve, 10-steering accumulator, 10.1-first accumulator, 10.2-second accumulator, 11-pressure sensor, 12-balancing valve, 12.1-first balancing valve, 12.2-second balancing valve, 13-angle sensor, 14-vehicle speed sensor, 15-steering cylinder, 15.1-first steering cylinder, 15.2-second steering cylinder, 16-steering wheel, 17-diverter block;

[0021] Steering valve group: P3-oil inlet, ACC1-steering accumulator first filling port, ACC2-steering accumulator second filling port, T1-pressure relief port, TSA-pressure measuring port, STR-oil supply port;

[0022] Electric proportional reversing valve: P4-oil inlet, T2-oil return port, A2-first oil outlet, B1-second oil outlet;

[0023] The first balancing valve: A3-oil inlet, B2-oil outlet;

[0024] Second balancing valve: A4-oil inlet, B3-oil outlet;

[0025] Hydraulic pump: S-suction port, P1-outlet port;

[0026] High pressure filter: P2-oil inlet, A1-oil outlet. DETAILED DESCRIPTION

[0027] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0028] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] refer to Figure 1 According to a preferred embodiment of the utility model, a human-electric dual-control steering hydraulic system of an electric wheel dump truck will be described in detail below.

[0031] Figure 1 This is a schematic diagram of the overall structure of a human-electric dual-control steering hydraulic system for an electric wheel dump truck of the utility model. Figure 2 The schematic diagram of the partial structure of the steering wheel 1, the electronic steering gear 2, the controller 3 and the electric proportional reversing valve 4 of the human-electric dual-control steering hydraulic system of the electric wheel dump truck of the utility model is shown as follows: Figure 1 and Figure 2The utility model comprises: an electric proportional reversing valve 4; a first electric proportional coil SV1 and a second electric proportional coil SV2 of the electric proportional reversing valve 4 are respectively connected to a controller 3, the controller 3 is connected to an electronic steering gear 2, and the electronic steering gear 2 is connected to a steering wheel 1 through a steering column; the electric proportional reversing valve 4 is respectively connected to a hydraulic oil tank 5, a steering valve group 9 and a balancing valve 12; the hydraulic oil tank 5 is connected to the steering valve group 9 via an oil suction filter 6, a hydraulic pump 7 and a high-pressure filter 8 in sequence; the steering valve group 9 is connected to a steering accumulator 10, and is connected to a pressure sensor 11 through a pressure measuring pipeline; the balancing valve 12 is connected to a steering cylinder 15 through a diverter block, and the steering cylinder 15 is connected to a steering wheel 16 through a steering axle mechanism; wherein the steering axle mechanism is provided with a rotation angle sensor 13, and the steering wheel 16 is provided with a vehicle speed sensor 14; the controller 3 controls the pressure sensor 11, the rotation angle sensor 13 and the vehicle speed sensor 14 respectively.

[0032] Specifically, the electric proportional reversing valve 4 is provided with an oil return port T2 and an oil inlet port P4, and the steering valve group 9 is provided with an oil supply port STR; the oil return port T2 of the electric proportional reversing valve 4 is connected to the hydraulic oil tank 5, and the oil inlet port P4 is connected to the oil supply port STR of the steering valve group 9.

[0033] Figure 3 FIG. 1 is a partial structural diagram of a balance valve 12 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck according to the utility model. Figure 3 As shown, the electric proportional reversing valve 4 is also provided with a first oil outlet A2 and a second oil outlet B1; the balancing valve 12 includes a first balancing valve 12.1 and a second balancing valve 12.2; the first balancing valve 12.1 is provided with an oil inlet A3; the second balancing valve 12.2 is provided with an oil inlet A4; the first oil outlet A2 of the electric proportional reversing valve 4 is connected to the oil inlet A3 of the first balancing valve 12.1, and the second oil outlet 1 is connected to the oil inlet A4 of the second balancing valve 12.2.

[0034] Figure 4 The schematic diagram of the partial structure of the hydraulic oil tank 5, the oil suction filter 6, the hydraulic pump 7 and the high-pressure filter 8 of the electric wheel dump truck human-electric dual-control steering hydraulic system of the utility model is shown as follows: Figure 4 As shown, the hydraulic pump 7 is provided with an oil suction port S and an oil outlet port P1, the high-pressure filter 8 is provided with an oil inlet port P2 and an oil outlet port A1, and the steering valve group 9 is also provided with an oil inlet port P3; the hydraulic oil tank 5 is connected to the oil suction filter 6, the oil suction filter 6 is connected to the oil suction port S of the hydraulic pump 7, the oil outlet port P1 of the hydraulic pump 7 is connected to the oil inlet port P2 of the high-pressure filter 8, and the oil outlet port A1 of the high-pressure filter 8 is connected to the oil inlet port P3 of the steering valve group 9.

[0035] Figure 5 FIG. 1 is a partial structural diagram of a steering valve group 9, a steering accumulator 10 and a pressure sensor 11 of a human-electric dual-control steering hydraulic system of an electric wheel dump truck according to the utility model. Figure 5As shown, the steering valve group 9 is also provided with a first steering accumulator filling port ACC1, a second steering accumulator filling port ACC2, a pressure relief port T1 and a pressure measuring port TSA; the steering accumulator 10 includes a first accumulator 10.1 and a second accumulator 10.2; the first steering accumulator filling port ACC1 on the steering valve group 9 is connected to the first accumulator 10.1, the second steering accumulator filling port ACC2 is connected to the second accumulator 10.2, the pressure relief port T1 is connected to the hydraulic oil tank 5, and the pressure measuring port TSA is connected to the pressure sensor 11 through a pressure measuring pipeline.

[0036] Figure 6 The schematic diagram of the partial structure of the steering angle sensor 13, the vehicle speed sensor 14, the steering cylinder 15, the steering wheel 16 and the diverter block 17 of the electric wheel dump truck human-electric dual control steering hydraulic system of the utility model is shown as follows: Figure 6 As shown, the steering cylinder 15 includes a first steering cylinder 15.1 and a second steering cylinder 15.2; the first balancing valve 12.1 is also provided with an oil outlet B2, and the second balancing valve 12.2 is also provided with an oil outlet B3; the oil outlet B2 of the first balancing valve 12.1 is connected to the rodless chamber of the first steering cylinder 15.1 and the rod chamber of the second steering cylinder 15.2; the oil outlet B3 of the second balancing valve 12.2 is connected to the rod chamber of the first steering cylinder 15.1 and the rodless chamber of the second steering cylinder 15.2.

[0037] In one embodiment, in the steering valve assembly 9, a pressure relief solenoid valve 9.1 is further provided on the pipeline between the oil supply port STR and the pressure relief port T1.

[0038] In one embodiment of the present application, when the controller 3 receives an unmanned driving signal from the vehicle control system, it switches to the unmanned driving mode, and outputs a corresponding steering electrical signal to the electric proportional reversing valve 4 based on the steering angle sent by the vehicle control system and the vehicle speed signal from the vehicle speed sensor 14; the electric proportional reversing valve 4 receives the electrical signal, and uses the first electric proportional coil SV1 or the second electric proportional coil SV2 to control the valve opening size according to the electrical signal, outputs the corresponding flow of pressure oil, pushes the steering cylinder 15 through the balancing valve 12, and the steering cylinder 15 drives the steering wheel 16 to steer; the steering angle sensor 13 provided in the steering axle mechanism detects the wheel steering angle in real time and feeds back to the controller 3. When the steering angle sent is reached, the controller 3 controls the electric proportional reversing valve 4 to return to the center position, and the electric proportional reversing valve 4 stops outputting pressure oil to complete the steering action.

[0039] Furthermore, when the driver turns the steering wheel 1, the electronic steering gear 2 is driven to rotate, and the electronic steering gear 2 sends a corresponding electrical signal to the controller 3 according to the driver's turning angle. The controller 3 switches to the manual driving mode, and outputs a corresponding steering electrical signal to the electric proportional reversing valve 4 according to the driver's steering torque combined with the vehicle speed signal of the vehicle speed sensor 14; the electric proportional reversing valve 4 receives the electrical signal, and uses the first electric proportional coil SV1 or the second electric proportional coil SV2 to control the valve opening size according to the electrical signal, outputs the corresponding flow of pressure oil, and pushes the steering cylinder 15 through the balance valve 12, and the steering cylinder 15 drives the steering wheel 16 to steer; the steering angle sensor 13 arranged in the steering axle mechanism detects the wheel steering angle in real time and feeds it back to the controller 3. When the sent steering angle is reached, the controller 3 controls the electric proportional reversing valve 4 to return to the middle position, and the electric proportional reversing valve 4 stops outputting pressure oil to complete the steering action.

[0040] In one embodiment of the present application, when the steering pump of the vehicle is damaged or the engine stops unexpectedly, the steering accumulator 10 pushes the pressure oil to flow into the steering cylinder 15, providing power for the steering hydraulic system to complete the steering requirements in an emergency state; when the vehicle stops, the pressure relief solenoid valve 9.1 is energized to open a channel to allow the oil in the steering accumulator 10 to flow back to the hydraulic oil tank 5 through the channel, thereby releasing the pressure of the steering accumulator 10.

[0041] It should be noted that the terms "first, second" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0042] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A human-electric dual-control steering hydraulic system for an electric wheel dump truck, characterized in that: include: Electric proportional reversing valve (4); The first electric proportional coil (SV1) and the second electric proportional coil (SV2) of the electric proportional reversing valve (4) are respectively connected to the controller (3), the controller is connected to the electronic steering gear (2), and the electronic steering gear (2) is connected to the steering wheel (1) through the steering column; the electric proportional reversing valve (4) is respectively connected to the hydraulic oil tank (5), the steering valve group (9) and the balance valve (12); the hydraulic oil tank (5) is connected to the steering valve group (9) via the oil suction filter (6), the hydraulic pump (7) and the high-pressure filter (8) in sequence; the steering valve group (9) is connected to the steering accumulator (10) and is connected to the pressure sensor (11) via the pressure measuring pipeline; the balance valve (12) is connected to the steering cylinder (15) via the diverter block (17), and the steering cylinder (15) is connected to the steering wheel (16) via the steering bridge mechanism; Wherein, the steering axle mechanism is provided with a steering angle sensor (13), and the steering wheel (16) is provided with a vehicle speed sensor (14); The controller (3) controls the pressure sensor (11), the rotation angle sensor (13) and the vehicle speed sensor (14) respectively.

2. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 1, characterized in that: The electric proportional reversing valve (4) is provided with an oil return port (T2) and an oil inlet port (P4), and the steering valve group (9) is provided with an oil supply port (STR); The oil return port (T2) of the electric proportional reversing valve (4) is connected to the hydraulic oil tank (5), and the oil inlet port (P4) is connected to the oil supply port (STR) of the steering valve group (9).

3. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 2, characterized in that: The electric proportional reversing valve (4) is also provided with a first oil outlet (A2) and a second oil outlet (B1); The balancing valve (12) comprises a first balancing valve (12.1) and a second balancing valve (12.2); the first balancing valve (12.1) and the second balancing valve (12.2) are both provided with an oil inlet; The first oil outlet (A2) of the electric proportional reversing valve (4) is connected to the oil inlet (A3) of the first balancing valve (12.1), and the second oil outlet (B1) is connected to the oil inlet (A4) of the second balancing valve (12.2).

4. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 2, characterized in that: The hydraulic pump (7) is provided with an oil suction port (S) and an oil outlet port (P1), the high-pressure filter (8) is provided with an oil inlet port (P2) and an oil outlet port (A1), and the steering valve group (9) is also provided with an oil inlet port (P3); The hydraulic oil tank (5) is connected to the oil suction filter (6), the oil suction filter (6) is connected to the oil suction port (S) of the hydraulic pump (7), the oil outlet (P1) of the hydraulic pump (7) is connected to the oil inlet (P2) of the high-pressure filter (8), and the oil outlet (A1) of the high-pressure filter (8) is connected to the oil inlet (P3) of the steering valve group (9).

5. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 4, characterized in that: The steering valve assembly (9) is also provided with a first steering accumulator filling port (ACC1), a second steering accumulator filling port (ACC2), a pressure relief port (T1) and a pressure measuring port (TSA); the steering accumulator (10) comprises a first accumulator (10.1) and a second accumulator (10.2); The first filling port (ACC1) of the steering accumulator on the steering valve group (9) is connected to the first accumulator (10.1), the second filling port (ACC2) of the steering accumulator is connected to the second accumulator (10.2), the pressure relief port (T1) is connected to the hydraulic oil tank (5), and the pressure measuring port (TSA) is connected to the pressure sensor (11) through a pressure measuring pipeline.

6. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 3, characterized in that: The steering cylinder (15) comprises a first steering cylinder (15.1) and a second steering cylinder (15.2); The first balancing valve (12.1) and the second balancing valve (12.2) are also provided with oil outlets; The oil outlet (B2) of the first balancing valve (12.1) is connected to the rodless chamber of the first steering oil cylinder (15.1) and the rod chamber of the second steering oil cylinder (15.2); The oil outlet (B3) of the second balancing valve (12.2) is connected to the rod chamber of the first steering oil cylinder (15.1) and the rodless chamber of the second steering oil cylinder (15.2).

7. The electric and human dual-control steering hydraulic system for an electric wheel dump truck as claimed in claim 1, characterized in that: Also includes: In the steering valve group (9), a pressure relief solenoid valve (9.1) is also arranged on the pipeline between the oil supply port (STR) and the pressure relief port (T1).

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