Multi-power-source electric transmission mining rigid vehicle driving system

Abstract

The invention relates to the technical field of mining rigid vehicles, in particular to a multi-power-source electric transmission mining rigid vehicle driving system. Comprising a first generator and a second generator which are arranged in a redundant mode, the input end of the first generator is connected with a first engine, the input end of the second generator is connected with a second engine, and the output ends of the first generator and the second generator are connected with a drive control unit. The first rectifier and the second rectifier are connected with the output end of the first generator, the third rectifier and the fourth rectifier are connected with the output end of the second generator, and the output ends of the first rectifier, the second rectifier, the third rectifier and the fourth rectifier are connected in parallel and then connected with a traction motor through a plurality of parallel main inverters. The system is applied to the mining rigid vehicle, the traction motor drives the tires of the rigid vehicle to run through the drive axle, and the power system is high in redundancy, continuous in power output, long in service life and suitable for being used in the field of the mining rigid vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of mining rigid vehicles, and in particular to a driving system of a mining rigid vehicle with multiple power sources and electric transmission. Background Art

[0002] Chinese patent document CN106794772A discloses an electric drive system for mining haul trucks: each electric wheel motor is powered by only one inverter, and when the inverter fails, the electric wheel cannot operate, and the main circuit is rectified by the main rectifier, and the auxiliary circuit is rectified by the auxiliary rectifier. When the auxiliary circuit fails, even if the main circuit works normally, the whole vehicle cannot operate normally due to the lack of cooling and other auxiliary electrical appliances. Overall, the system redundancy is poor. The driving system of a mining rigid vehicle is generally used on a rigid vehicle. The working environment of a rigid vehicle is complex, and the probability of failure of each component is high. Therefore, it is crucial to improve the redundancy of the drive system. The high system redundancy allows the rigid vehicle to operate safely even under complex working conditions. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a mining rigid vehicle driving system with high redundancy.

[0004] In view of the deficiencies in the prior art, the technical solution adopted by the present invention to solve the technical problems is: a multi-power source electric transmission mining rigid vehicle drive system, including redundantly arranged generator 1 and generator 2, the input end of generator 1 is connected to engine 1, the input end of generator 2 is connected to engine 2, the output ends of generator 1 and generator 2 are connected to a drive control unit, the drive control unit includes rectifier 1, rectifier 2, rectifier 3 and rectifier 4, rectifier 1 and rectifier 2 are connected to the output end of generator 1, rectifier 3 and rectifier 4 are connected to the output end of generator 2, and the output ends of rectifier 1, rectifier 2, rectifier 3 and rectifier 4 are connected in parallel and then connected to a traction motor via a plurality of parallel main inverters.

[0005] Preferably, the multiple parallel main inverters include main inverter one, main inverter two, and main inverter three.

[0006] Preferably, the drive control unit also includes auxiliary inverter 1 and auxiliary inverter 2, auxiliary inverter 1 and auxiliary inverter 2 are connected in parallel at the DC end of rectifier 1 to rectifier 4, the output end of auxiliary inverter 1 is connected to the hydraulic motor, and the output end of auxiliary inverter 2 is connected to the cooling fan.

[0007] Preferably, the drive control unit further includes a chopper, which is connected in parallel to the DC ends of rectifiers 1 to 4, and the output end of the chopper is connected to a braking resistor.

[0008] Preferably, the driving control unit further includes a step-down module DCDC, the step-down module DCDC is connected in parallel to the DC ends of rectifiers 1 to 4, and the output end of the step-down module DCDC is connected to low-voltage electrical appliance 1 and low-voltage electrical appliance 2.

[0009] A dual-power source electric drive rigid vehicle comprises a generator 1, a generator 2, a drive control unit, a traction motor, and a brake resistor. The input end of the generator 1 is connected to the engine 1, the input end of the generator 2 is connected to the engine 2, the output ends of the generator 1 and the generator 2 are connected to the drive control unit, the rectifier 1 and the rectifier 2 inside the drive control unit are connected to the output end of the generator 1, the rectifier 3 and the rectifier 4 are connected to the output end of the generator 2, the rectifier 1 and the rectifier 2, the rectifier 3 and the rectifier 4 are connected in parallel on the DC side and provide stable AC power to the traction motor through three main inverters, the traction motor is connected to the drive bridge through a transmission shaft, the drive bridge drives the tires of the rigid vehicle to run, and the chopper of the drive control unit is connected to the brake resistor.

[0010] The beneficial effects of the present invention are as follows: 1. High utilization rate of the power system: when the vehicle requires a large power, the two engines work together. When the vehicle requires a small power, only one engine generates electricity, and the engine can work in a high-efficiency range; the other engine can not work or can maintain the speed through reverse drag of the generator, but no fuel injection, saving energy.

[0011] 2. Strong system redundancy: When the engine of a single-power source rigid vehicle fails, the entire vehicle cannot be used; when one power system of a multi-power source fails, the other power system can still be driven normally. The electricity generated by a generator is rectified by multiple rectifiers. When a single rectifier fails, the generator can still be used with limited power. A traction motor is powered by multiple inverters. When a single inverter fails, the traction motor can still be used with limited power.

[0012] 3. Long service life: The engine of a single power source rigid vehicle must continue to provide power when the vehicle is running. Multiple power sources can switch engines in turn when they meet the use needs.

[0013] 4. Continuous power output: Single traction motor direct drive without shifting, power output is uninterrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the system of the present invention;

[0015] Figure 2 Schematic diagram of a rigid vehicle using the system of the present invention.

[0016] Figure 3 It is the principle diagram involved in the present invention.

[0017] Explanation of the reference numerals: 1. Engine 1; 2. Engine 2; 3. Generator 1; 4. Generator 2; 5. Drive control unit; 51. Rectifier 1; 52. Rectifier 2; 53. Rectifier 3; 54. Rectifier 4; 55. Main inverter 1; 56. Main inverter 2; 57. Main inverter 3; 58. Auxiliary inverter 1; 59. Auxiliary inverter 2; 6. Traction motor; 7. Step-down module DCDC; 71. Low-voltage electrical appliance 1; 72. Low-voltage electrical appliance 2; 8. Chopper; 81. Braking resistor; 9. Hydraulic motor; 10. Cooling fan; 11. Drive axle. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0019] As shown in the figure, a multi-power source electric drive mining rigid vehicle driving system includes an engine 1 and an engine 2, the rear end of the engine 1 is connected to a generator 3, the rear end of the engine 2 is connected to a generator 4, the AC power generated by the generator 3 is rectified by a rectifier 1 51 and a rectifier 2 52 connected in parallel, and the AC power generated by the generator 24 is rectified by a rectifier 3 53 and a rectifier 4 54 connected in parallel. The four rectifiers at the rear ends of the generator 1 3 and the generator 2 4 are connected in parallel at the DC end to provide current to three main inverters, which are respectively a main inverter 1 55, a main inverter 2 56, and a main inverter 3 57. The main inverter 1 55, the main inverter 2 56, and the main inverter 3 57 are connected in parallel and convert the DC power into AC power to supply the traction motor 6. The drive control unit 5 also includes an auxiliary inverter 1 58 and an auxiliary inverter 2 59 to supply power to the AC auxiliary electrical appliances, which include a hydraulic motor 9 and a cooling fan 10. The drive control unit 5 supplies direct current to low-voltage electrical appliances through the step-down module DCDC7, and the low-voltage electrical appliances include low-voltage electrical appliances one 71 and low-voltage electrical appliances two 72; the drive control unit 5 also includes a chopper 8, and the chopper 8 is connected to an external braking resistor 81. The auxiliary inverter one 58, the auxiliary inverter two 59, the step-down module DCDC7 and the chopper 8 are all connected in parallel with the DC output terminals of the rectifier one 51 to the rectifier four 54. When the system of the present invention brakes, the AC power generated by the traction motor 6 is inverted into DC power by the main inverter, and then converted into heat energy consumption through the braking resistor 81 after passing through the chopper 8. Since the vehicle has multiple engines as power sources, when one engine fails, the other engine can still be driven normally, and the whole vehicle can be used with limited power. The electricity generated by a generator is rectified by multiple rectifiers. When a single rectifier fails, the generator can still be used with limited power. The traction motor 6 is powered by a plurality of main inverters. When a single main inverter fails, the traction motor 6 can still be used with limited power. It can be seen that the system redundancy of the present invention is relatively strong.

[0020] A dual-power source electric drive rigid vehicle, hereinafter referred to as a rigid vehicle, comprises a multi-power source electric drive mining rigid vehicle drive system of the present invention. Figure 2As shown, the electric drive part of the rigid vehicle includes a generator 1 3, a generator 2 4, a drive control unit 5, a traction motor 6, and a brake resistor 81. Rectifier 1 51 and rectifier 2 52 inside the drive control unit 5 are connected to the output end of the generator 1 3, rectifier 3 53 and rectifier 4 54 are connected to the output end of the generator 2 4, rectifier 1 51 and rectifier 2 52, rectifier 3 53 and rectifier 4 54 are connected in parallel on the DC side and provide stable AC power to the traction motor 6 through three main inverters. The electric drive of the rigid vehicle adopts an AC-DC-AC circuit. During traction, the three-phase AC voltage generated by the engine driving the generator is first rectified into a DC voltage by a rectifier, and then inverted into a VVVF voltage by the main inverter to drive the traction motor 6 to work. The traction motor 6 is connected to the drive axle 11 through a transmission shaft, and the drive axle 11 drives the rigid vehicle tires to run; during braking, the three-phase AC voltage generated by the traction motor 6 is rectified into a DC voltage by the main inverter, and then connected to the brake resistor 81 through a chopper 8, and the excess energy is consumed by the brake resistor 81. The power source of the whole machine is the engine driving the generator to generate electricity. Generator 13 corresponds to engine 1, and generator 24 corresponds to engine 22. It has strong redundancy and does not contain a power battery, which can be applied to extremely cold conditions. Due to the limitation of the wheel hub size, small-tonnage rigid vehicles are not suitable for wheel-side motor drive (small size and complex design structure). This solution is driven by a single traction motor 6 during traction. The motor is not limited by the wheel hub size and is more suitable for small-tonnage rigid vehicles.

[0021] like Figure 3 As shown, the horizontal axis is the engine speed, and the vertical axis is the engine torque; the power output of the engine P = n*T / 9550, where n (unit rpm) is the engine speed, T (unit Nm) is the engine torque, and P (unit kW) is the power output of the engine. Assuming that the power demand at the wheel end is the same, whether one engine or two engines are used to provide power, the output power P must be achieved. Assuming that the engine speed n is the same, if one engine is used to generate the required power, then P = n*T1 / 9550*y1, where y1 is the energy conversion efficiency corresponding to the engine speed n; T1 is the torque at the speed n. If the two engines work at the same time, the power of each engine P = 2*P1 = 2*n*T2 / 9550*y2, where y2 is the energy conversion efficiency corresponding to the output power of a single engine P1 and the speed n; T2 is the torque at the speed n. As shown Figure 3As shown in , the conversion efficiency of the engine changes with the distribution area of ​​the speed and torque. We expect that the conversion efficiency of the engine can be optimized regardless of the working condition. In actual operation, T1*y1=2*T2*y2. From the figure, it can be seen that the engine energy conversion efficiency y1>y2, then T1<2*T2, that is, the torque output when a single engine is running is less than the output torque of the dual engines to achieve the same wheel-end output power, and the single engine has higher operating efficiency and is more fuel-efficient. Combined with the redundant setting of the dual-power source electric drive rigid vehicle of the present invention, when the power demand is not high, such as no-load, flat road and other working conditions, only one engine is used to provide energy source for the whole vehicle; when the power demand is large, such as climbing, loading and other working conditions, two engines can be used to work together; no fuel consumption can be achieved in downhill and other road conditions. The specific implementation method is as follows: the traction motor 6 generates electricity, and the generated electric energy is rectified and inverted to be shared with the generator. The generator drives the engine as an electric motor, and the engine does not spray oil to achieve no fuel consumption.

Claims

1. A multi-power source electric drive mining rigid vehicle driving system, characterized by: The invention comprises a redundantly arranged generator 1 (3) and a generator 2 (4), wherein the input end of the generator 1 (3) is connected to the engine 1 (1), the input end of the generator 2 (4) is connected to the engine 2 (2), the output ends of the generator 1 (3) and the generator 2 (4) are connected to a drive control unit (5), the drive control unit (5) comprises a rectifier 1 (51), a rectifier 2 (52), a rectifier 3 (53) and a rectifier 4 (54), the rectifier 1 (51) and the rectifier 2 (52) are connected to the output end of the generator 1 (3), the rectifier 3 (53) and the rectifier 4 (54) are connected to the output end of the generator 2 (4), and the output ends of the rectifier 1 (51), the rectifier 2 (52), the rectifier 3 (53) and the rectifier 4 (54) are connected in parallel and then connected to a traction motor (6) via a plurality of parallel main inverters.

2. A multi-power source electric drive mining rigid vehicle driving system as claimed in claim 1, characterized in that: The multiple parallel main inverters include main inverter one (55), main inverter two (56), and main inverter three (57).

3. A multi-power source electric drive mining rigid vehicle driving system as claimed in claim 2, characterized in that: The drive control unit (5) further comprises an auxiliary inverter 1 (58) and an auxiliary inverter 2 (59), wherein the auxiliary inverter 1 (58) and the auxiliary inverter 2 (59) are connected in parallel to the DC end of the rectifier 1 (51) to the rectifier 4 (54), the output end of the auxiliary inverter 1 (58) is connected to the hydraulic motor (9), and the output end of the auxiliary inverter 2 (59) is connected to the cooling fan (10).

4. A multi-power source electric drive mining rigid vehicle driving system as claimed in claim 3, characterized in that: The drive control unit (5) also includes a chopper (8), which is connected in parallel to the DC ends of rectifiers 1 (51) to 4 (54), and the output end of the chopper (8) is connected to a braking resistor (81).

5. A multi-power source electric drive mining rigid vehicle driving system as claimed in claim 4, characterized in that: The drive control unit (5) further comprises a voltage reduction module DCDC (7), the voltage reduction module DCDC (7) being connected in parallel to the DC ends of rectifiers 1 (51) to rectifier 4 (54), and the output end of the voltage reduction module DCDC (7) being connected to low-voltage electrical appliance 1 (71) and low-voltage electrical appliance 2 (72).

6. A dual-power source electrically driven rigid vehicle, characterized in that: The invention comprises a generator 1 (3), a generator 2 (4), a drive control unit (5), a traction motor (6), and a brake resistor (81). The input end of the generator 1 (3) is connected to the engine 1 (1), the input end of the generator 2 (4) is connected to the engine 2 (2), the output ends of the generator 1 (3) and the generator 2 (4) are connected to the drive control unit (5), the rectifier 1 (51) and the rectifier 2 (52) inside the drive control unit (5) are connected to the output end of the generator 1 (3), the rectifier 3 (53) and the rectifier 4 (54) are connected to the output end of the generator 2 (4), the rectifier 1 (51) and the rectifier 2 (52), the rectifier 3 (53) and the rectifier 4 (54) are connected in parallel on the DC side and provide stable AC power to the traction motor (6) through three main inverters, the traction motor (6) is connected to the drive bridge (11) through a transmission shaft, the drive bridge (11) drives the rigid vehicle tire to run, and the chopper (8) of the drive control unit (5) is connected to the brake resistor (81).

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