Lithium ion storage battery hydraulic excavator for coal mine

Abstract

The invention discloses a lithium ion storage battery hydraulic excavator for a coal mine. The lithium ion storage battery hydraulic excavator aims at solving the problem that an existing electric hydraulic excavator is inconvenient to use, maintain, move for a long distance and transfer. Comprising a working device, a rotary driving device, a chassis walking device, a slewing mechanism, a control mechanism, a lithium ion power supply, a battery management unit, a vehicle-mounted control unit, a switched reluctance speed regulating motor, a hydraulic system, a cooling system and an upper frame. The upper frame is fixedly connected with the chassis walking device through a slewing support of the slewing mechanism, a positioning pin and a bolt; the working device bracket is rotatably connected with the outer ring of the rotary driving device; and the inner ring of the rotary driving device is fixedly connected with the frame deflection bracket of the upper frame. An external cable is not needed, a charging pile is used for direct charging, and professional electricians are not needed; walking and operation only need to be independently operated by a single person, auxiliary personnel are not needed, use, maintenance, long-distance movement and transition are convenient, and the comprehensive operation cost is low.

Description

Technical Field

[0001] The invention relates to the application and development of new energy explosion-proof lithium-ion battery technology, and specifically to a new type of hydraulic excavator for coal mines which adopts new energy explosion-proof lithium-ion battery as a power source. Background Art

[0002] The explosion-proof electric hydraulic excavator for coal mines is mainly used for excavation and repair operations in flammable and explosive working environments and special working conditions such as vertical shafts, inclined shafts, and horizontal lanes in coal mines and non-coal mines, meeting multiple functions such as excavation, rock loading, crushing, bottoming, wall expansion, cleaning, cutting, and transportation. The working principle is to start the motor through an external three-phase 660V (1140V) power supply to convert electrical energy into mechanical energy. The motor drives the hydraulic pump to generate pressure oil, and the pressure oil controls the action of the actuator through the distribution valve to realize the excavation, rotation, and walking functions of the excavator.

[0003] The main problems and disadvantages of the existing electric hydraulic tunnel boring machines are: first, an external power supply is required; second, wiring requires professional electricians; third, the operating distance is short, and one power connection can only be used for a short distance (generally within 100 meters); fourth, when walking and working, auxiliary personnel are required to drag the cables behind the machine body to prevent the high-voltage cables from being entangled and crushed, which may cause danger.

[0004] Due to the above problems and shortcomings, the labor operating cost of using the existing electric hydraulic oil excavator is high, and it is inconvenient to use, maintain, move long distances and transfer. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a lithium-ion battery hydraulic excavator for coal mines, which does not require an external cable, can be charged directly using a charging pile, and does not require a professional electrician; walking and operation only require one person to operate independently, without the need for auxiliary personnel, and is easy to use, maintain, move long distances and transfer, with low overall operating costs.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A lithium-ion battery hydraulic excavator for coal mines, comprising a working device, a rotary drive device, a chassis traveling device, a slewing mechanism, a control mechanism, a lithium-ion power supply, a battery management unit, an on-board control unit, a switched reluctance speed regulating motor, a hydraulic system, a cooling system and an upper frame; The upper frame is composed of an upper platform, a frame tilt bracket, a frame, an armrest frame, a motor mounting seat, a seat, a driving canopy and an outer hood; the upper frame is fixedly connected to the chassis running device through a slewing support of a slewing mechanism, a positioning pin and a bolt; The working device comprises a bucket, a dipper rod, a boom, a working cylinder and a bracket; the working device bracket and the outer ring of the rotary drive device are rotatably connected; The inner ring of the rotary drive device is fixedly connected to the frame yaw bracket of the upper frame; The chassis running gear and the inner ring of the slewing bearing of the slewing mechanism are fixedly connected; The outer ring of the slewing support of the slewing mechanism and the upper platform of the upper frame are rotatably connected; The operating mechanism and the upper frame are fixedly connected; The lithium-ion power source is detachably mounted on the upper platform of the upper frame; the battery management unit is built into the sealed explosion-proof housing of the lithium-ion power source; The on-board control unit is fixedly connected to the upper frame frame; the stopper of the switched reluctance speed regulating motor is positioned at the upper frame motor mounting seat, and is splined with a coupling and a plunger pump; the hydraulic system is fixedly connected to the upper frame, the chassis running device and the working device; the cooling system is fixedly connected to the upper platform and the frame of the upper frame.

[0007] Furthermore, the rotary drive device has the dual functions of ±90° horizontal rotation and ±25° vertical swing; the rotary drive device is composed of a rotary reducer, a drive swing bracket, an upper lubricating bushing, an upper cross-hinged half shaft, a lower lubricating bushing, a lower cross-hinged half shaft, a swing cylinder and a connecting pipeline; The rotary reducer is connected to the driving yaw bracket through bolts, and the driving yaw bracket is connected to the yaw cylinder through upper and lower cross-hinged half-axes, and the upper and lower cross-hinged half-axes are respectively provided with upper and lower lubricating bushings; the connecting pipeline is connected to the distribution valve, and the connecting pipeline is used to provide pressure oil to the rotary reducer and the yaw cylinder.

[0008] Furthermore, the slewing mechanism is composed of a hydraulic motor reducer, a slewing support, a brake and a lubrication system, and the slewing mechanism is fixedly connected to the upper platform of the upper frame by bolts and locating pins.

[0009] Furthermore, the battery management unit includes a BMS battery management system, a control module, a display module, a wireless communication module, and an information collection module; the BMS battery management system is connected to the wireless communication module and the display module respectively through communication interfaces, the output end of the information collection module is connected to the input end of the BMS battery management system, the output end of the BMS battery management system is connected to the input end of the control module, and the control module is respectively connected to the power battery pack and the vehicle-mounted control unit.

[0010] Furthermore, the hydraulic system includes a plunger pump, a distribution valve, an oil source valve, a central swivel joint and a hydraulic oil tank. The plunger pump is connected to the motor mounting seat and the motor output shaft respectively through bolts and a coupling; the hydraulic system is equipped with a pressure sensor and connected to the vehicle-mounted control unit.

[0011] Furthermore, the cooling system includes two independent subsystems, water cooling and oil cooling; the water cooling system is composed of a water pump motor, a switched reluctance motor cooling water channel, a water cooling radiator, an expansion water tank and a water cooling connecting pipeline; the oil cooling system is composed of a fan gear pump, a fan motor, an oil cooling radiator and an oil cooling connecting pipeline, the fan gear pump is directly connected in series to the hydraulic system plunger pump, the plunger pump and the fan gear pump work in a coaxial linkage to provide pressure and flow for the fan motor, drive the fan to rotate, and realize air suction and heat dissipation; The water-cooled radiator and the oil-cooled radiator adopt a parallel combination structure and share a cooling fan to form an integrated oil-water dual-cooling radiator; The cooling system is equipped with a temperature sensor and is connected to the vehicle-mounted control unit.

[0012] The beneficial effects of the present invention are as follows: 1. The present invention uses lithium-ion batteries as power sources, does not require external power cables, uses charging piles for direct charging, and does not require professional electricians. A fast charger is used in conjunction with the vehicle, and a full charge takes only 2 hours. Since the machine uses an on-board control unit with multiple input / output interfaces and information management and computing capabilities, and is equipped with a hydraulic system pressure sensor and a cooling system temperature sensor, the whole vehicle is intelligently managed and optimized to achieve energy saving and overheating and overload protection of the hydraulic system, thereby ensuring the power, economy, reliability and safety of the whole vehicle.

[0013] 2. The present invention only requires one person to walk and operate independently, without the need for auxiliary personnel. It is easy to use, maintain, move long distances and transfer, and the charging price is cheap (the charging price during off-peak and valley periods is only about 0.3 yuan / kWh), and the overall operating cost is low.

[0014] 3. Since the machine adopts a flexible connection combination structure with rotation and swing functions between its working device and the upper frame, it can simultaneously complete compound relative movements such as ±90° horizontal rotation along the axis of the rotating drive device and ±25° vertical swing along the cross-hinged axis, realizing flexible connection and multi-angle operation without dead ends, significantly enhancing the functionality, adaptability and flexibility in complex working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the structure of a lithium-ion battery hydraulic excavator for coal mines in a disassembled state according to the present invention; Figure 2 A schematic diagram of the external structure of a lithium-ion battery hydraulic excavator for coal mines of the present invention; Figure 3 A front view of a lithium-ion battery hydraulic excavator for coal mines according to the present invention; Figure 4 A top view of a lithium-ion battery hydraulic excavator for coal mines of the present invention; Figure 5 A side view of a lithium-ion battery hydraulic excavator for coal mining of the present invention; Figure 6 A front view of a lithium-ion battery hydraulic excavator for coal mines of the present invention; Figure 7 It is a rear view of a lithium-ion battery hydraulic excavator for coal mines of the present invention; Figure 8 It is a side view of the other side of a lithium-ion battery hydraulic excavator for coal mines of the present invention; Fig. 9 A schematic diagram of a heat dissipation system (an integrated oil-water dual-cooling radiator) selected for a lithium-ion battery hydraulic excavator for coal mines according to the present invention; Fig.10 This is a schematic diagram of a flexible connection combination structure with rotation and swing functions selected for a lithium-ion battery hydraulic excavator for coal mines of the present invention.

[0017] Fig.11 The present invention is a structural schematic diagram of an upper frame of a lithium-ion battery hydraulic excavator for coal mines.

[0018] Among them, the accompanying drawings are marked as: working device 1, rotating drive device 2, chassis walking device 3, slewing mechanism 4, operating mechanism 5, lithium-ion power supply 6, battery management unit 7, on-board control unit 8, switched reluctance speed control motor 9, hydraulic system 10, cooling system 11, upper frame 12, frame yaw bracket 13, bracket 14, lower lubricating bushing 15, lower cross-articulated half shaft 16, yaw cylinder 17, upper lubricating bushing 18, upper cross-intersecting half shaft 19, upper platform 20, driving yaw bracket 21, frame 22, handrail frame 23, motor mounting seat 24, seat 25, driving canopy 26, outer hood 27, water pump motor 28, switched reluctance motor cooling water channel 29, water-cooled radiator 30, expansion water tank 31, water-cooled connecting pipeline 32, fan gear pump 33, fan motor 34, oil-cooled radiator 35, oil-cooled connecting pipeline 36. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 like Figure 1-Figure 11 As shown, a lithium-ion battery hydraulic excavator for coal mines includes a working device 1, a rotary drive device 2, a chassis walking device 3, a slewing mechanism 4, a control mechanism 5, a lithium-ion power supply 6, a battery management unit 7, an on-board control unit 8, a switched reluctance speed regulating motor 9, a hydraulic system 10, a cooling system 11 and an upper frame 12; The working device 1 is mainly composed of a bucket, a dipper rod, a boom, a working cylinder and a bracket 14. The main body is welded with a Q355B high-strength thin plate box structure, which makes the overall tensile and bending strength high and light, so as to ensure that it can work normally under various complex working conditions in the underground tunnel, and ensure its durability and safety. The working device 1 and the rotary drive device 2 are fixedly connected by the bracket 14 and bolts.

[0021] The rotary drive device 2 is composed of a rotary reducer, a driving yaw bracket 21, an upper lubricating bushing 18, an upper cross-hinged half shaft, a lower lubricating bushing 15, a lower cross-hinged half shaft 16, a yaw cylinder 17 and a connecting pipeline. The rotary reducer is connected to the driving yaw bracket 21 by bolts, and the driving yaw bracket 21 is connected to the yaw cylinder 17 by a hinge pin. The connecting pipeline is connected to the distribution valve to provide pressure oil to the rotary reducer and the yaw cylinder 17. The rotary drive device 2 has the dual functions of ±90° horizontal rotation and ±25° vertical swing. The rotary reducer adopts the heavy-duty worm gear transmission structure of Huafang, USA, and adopts double enveloping annular surface technology. It can withstand axial force, radial force and tipping moment at the same time and has a strong bearing capacity. The rotary drive device 2 is connected to the upper frame 12 through the yaw bracket 14, the upper and lower hinge pins and bolts.

[0022] The chassis travel device 3 is composed of a crawler frame, crawler tracks, guide wheels, supporting wheels, drag chain plates, driving wheels, travel motor reducers, tensioning devices, push shovel cylinders and push shovels, and is fixedly connected to the upper frame 12 through a slewing support, positioning pins and bolts; The slewing mechanism 4 is composed of a hydraulic motor reducer, a slewing support, a brake and a lubrication system, and is fixedly connected to the upper platform 20 of the upper frame 12 by bolts and locating pins; it can simultaneously withstand large axial loads, radial loads and tipping moments, ensuring that the entire vehicle can operate stably, efficiently and safely.

[0023] The operating mechanism 5 adopts hydraulic pilot control, human-machine integrated structure layout, and adopts safety locking rod control switch and travel limit device. The operating mechanism 5 is connected with the upper frame 12 by bolts.

[0024] The lithium-ion power source 6 is mainly composed of single cells connected in series, with a rated output voltage of 320V, a rated output current of 230A, a cycle life of ≥1500 times, an operating temperature range of -20°C to +75°C, and has protection functions such as overcharge, over-discharge, short circuit, charge and discharge overcurrent, output short circuit, overheating, low temperature charging prohibition, and severe over-discharge charging prohibition. The lithium-ion power source 6 is fixedly connected to the upper platform 20 of the upper frame 12 by positioning blocks and bolts.

[0025] The battery management unit 7 monitors the status of each cell of the battery pack, and has basic functions such as total voltage acquisition, cell voltage acquisition, temperature acquisition, current acquisition, insulation monitoring, fan control, heating control, etc. It also has functions such as equalization circuit, capacity management, charging management, and power distribution management. The most prominent feature is the development of an integrated vehicle control function, which realizes accessory control and vehicle driving according to the energy status of the vehicle and the driver's intention. It includes a BMS battery management system, a control module, a display module, a wireless communication module, and an information collection module. The BMS battery management system is connected to the wireless communication module and the display module respectively through a communication interface, the output end of the information collection module is connected to the input end of the BMS battery management system, the output end of the BMS battery management system is connected to the input end of the control module, and the control module is connected to the power supply battery pack and the vehicle control unit 8 respectively. The control module communicates with the acquisition module at high speed through the CAN bus interface. The control module dynamically formulates a battery management strategy through real-time acquisition and analysis of battery pack data, controls the power supply to work in a suitable working condition through thermal management, active balancing management, charging management, discharge management, boundary management and other means, and exchanges information with the mine intrinsically safe display instrument, switched reluctance speed control motor 9 and charging pile. The battery management unit 7 and the lithium-ion power supply 6 are integrated in a closed explosion-proof box.

[0026] The on-board control unit 8 is the core functional component of the vehicle control system. It has an input voltage of DC 24V and is equipped with a variety of input / output interfaces and a main control box with information management and computing capabilities to jointly realize the control of the entire vehicle. The on-board control unit 8 is responsible for coordinating and controlling the various subsystems of the vehicle, collecting and processing the data of various components of the vehicle, and providing corresponding control instructions according to the vehicle status and user operations. The on-board control unit 8 is connected to the upper frame 12 frame 22 through the mounting bracket with bolts. The power input / output interface of the on-board control unit 8 is externally connected to electrical components such as methane circuit breakers, locomotive lights, sound and light signal devices, and control buttons.

[0027] The switch reluctance speed regulating motor 9 is used as a power source, with a rated input voltage of DC320V, a rated input current of DC52A, and a rated speed of 1500r / min. The power selection depends on the rated power of the lithium-ion power supply 6. Its control mode is torque control, which can be quickly and smoothly converted during operation and run in four quadrants. The control source is the control bus (CAN) and the control panel, which is used in conjunction with the vehicle controller with CAN communication to provide source power for the vehicle hydraulic system 10, complete the speed control functions such as starting, acceleration, deceleration, and braking of the vehicle, and has protection functions such as overvoltage, undervoltage, overcurrent, overload, stall, short circuit, overspeed, controller overheating, motor winding overheating, motor position sensor error, CAN communication interruption, current sensor error, parameter setting error, etc., and the protection parameters are adjustable. The switch reluctance speed regulating motor 9 is directly fixed to the bottom plate of the upper frame 12 with bolts.

[0028] The hydraulic system 10 adopts load-sensitive technology and modular design, and can accurately provide pressure and flow that match the load. The hydraulic system 10 is mainly composed of a plunger pump, a distribution valve, an oil source valve, a central rotary joint and a hydraulic oil tank. The plunger pump is connected to the motor mounting seat 24 and the motor output shaft through bolts and couplings. The hydraulic system 10 is equipped with a pressure sensor and connected to the vehicle control unit 8; The cooling system 11 includes two systems: water cooling and oil cooling. The water cooling system consists of a water pump motor 28, a switched reluctance motor cooling water channel 29, a water cooling radiator 30, an expansion water tank 31 and a water cooling connecting pipe 32; the oil cooling system consists of a fan gear pump 33, a fan motor 34, an oil cooling radiator 35 and an oil cooling connecting pipe 36. The fan gear pump 33 is directly connected in series to the plunger pump of the hydraulic system 10. The plunger pump and the fan gear pump 33 work coaxially to provide pressure and flow for the fan motor 34, drive the fan to rotate, and realize air suction and heat dissipation. The water cooling radiator 30 and the oil cooling radiator 35 adopt a parallel combination structure, share a cooling fan, and form an integrated oil-water dual cooling radiator; the cooling system 11 is equipped with a temperature sensor and connected to the vehicle control unit 8.

[0029] The upper frame 12 is composed of an upper platform 20, a frame yaw bracket 13, a frame 22, an armrest frame 23, a motor mounting seat 24, a seat 25, a cab 26 and an outer hood 27; the upper frame 12 is fixedly connected to the chassis running device 3 through a slewing support, a locating pin and bolts.

[0030] How it works The working principle of the lithium-ion battery hydraulic excavator for coal mines is mainly to drive the flameproof switched reluctance speed regulating motor 9 for mining through the electric energy of the explosion-proof lithium-ion battery. The motor drives the hydraulic pump to generate pressure and flow, and then drives the cylinder, motor and other actuators through the distribution valve to realize various functions and actions. When the excavator needs to move, the switched reluctance speed regulating motor 9 drives the hydraulic travel motor to rotate through the hydraulic pump, and then drives the mechanical transmission mechanism such as sprocket and chain to complete the walking task. When performing excavation, bulldozing, grabbing and other operations, the switched reluctance speed regulating motor 9 drives the cylinder and working mechanism through the hydraulic pump to complete the related operations.

[0031] The vehicle control unit 8 selected by the present invention serves as the management center of the vehicle control system, is responsible for coordinating and controlling the various subsystems of the vehicle, collecting and processing data of various components of the vehicle, and providing corresponding control instructions according to the vehicle status and user operations.

[0032] The speed of the low-speed motor is adjusted by installing a pressure sensor on the main valve of the machine to sense and transmit the pressure signal of the vehicle under no-load state (the rated speed of the motor under load state is 1500r / min, the rated pressure of the hydraulic system 10 is 25MPa, and the pressure and signal current range of the pressure sensor is 0-25MPa / 4-20mA). When the pressure of the hydraulic system 10 is ≤3MPa under no-load state, the linear signal current is transmitted to the on-board control unit 8, and a control signal with a target speed of 50% of the rated speed (1500r / min×50%=750r / min) is sent to the switched reluctance speed control motor 9 through the control bus. The signal sending process is realized by the Simulink simulation program, and the motor controller responds to the control instruction to achieve the target speed to achieve the purpose of saving power consumption. If the target speed is higher or lower than 50%, too small or too large a speed adjustment range will indeed waste power, because the speed adjustment range directly affects the output power of the motor and the battery power consumption rate.

[0033] By adding a temperature sensor to the cooling system 11, the hydraulic oil temperature under the working state of the whole vehicle can be obtained in real time. Then the on-board control unit 8 sends a control signal with a target speed of 0 (shutdown) to the motor through the control bus. The motor controller responds to the control instruction to achieve the target speed, so as to realize overheating and overload protection of the hydraulic system 10.

[0034] The cooling system 11 selected by the present invention includes two independent subsystems, water cooling and oil cooling. The water cooling radiator 30 and the oil cooling radiator 35 adopt a parallel combination structure and share a cooling fan to form an integrated oil-water dual cooling radiator. The whole vehicle starts to work and stops when it is shut down, without the need for separate switch operation. The water cooling system consists of an explosion-proof water pump motor 28, a switching reluctance motor cooling water channel 29, a water cooling radiator 30, an expansion water tank 31 and a water cooling connecting pipe 32. The coolant circulates in and out of the water cooling radiator 30 under the suction and discharge action of the water pump motor 28; the oil cooling system consists of a fan gear pump 33, a fan motor 34, an oil cooling radiator 35 and an oil cooling connecting pipe 36. The fan gear pump 33 is directly connected in series to the main pump, and the main pump and the fan gear pump 33 work in a coaxial linkage to provide pressure and flow for the fan motor 34, drive the fan to rotate, and realize air suction and heat dissipation. The cooling system 11 has a simple and compact structure, low cost, and convenient maintenance.

[0035] A flexible connection combination structure with rotation and swing functions located between the working device 1 and the upper frame 12. The working device 1, the rotary drive device 2 and the upper frame 12 can simultaneously complete compound relative movements such as ±90° horizontal rotation along the axis of the rotary drive device 2 and ±25° vertical swing along the cross-hinged axis through the organic combination of the upper cross-hinged half-shaft, the lower cross-hinged half-shaft 16, the lubricating bushing, the yaw cylinder 17, the yaw bracket 14 and the rotary reducer, thereby realizing flexible connection and multi-angle operation without dead angles, and enhancing functionality, adaptability and flexibility in complex working environments.

[0036] This machine uses lithium-ion batteries as power sources, does not require external power cables, uses charging piles to charge directly, and does not require professional electricians. It is equipped with a fast charger, and it only takes 2 hours to fully charge. Since the machine uses an on-board control unit 8 with multiple input / output interfaces and information management and computing capabilities, and is equipped with a hydraulic system 10 pressure sensor and a cooling system 11 temperature sensor, the entire vehicle is intelligently managed and optimized to save energy and protect the hydraulic system 10 from overheating and overload, thereby ensuring the power, economy, reliability and safety of the entire vehicle. Taking the DXBL73600 lithium-ion power supply 6 as an example, according to the conventional calculation formula, the theoretical working time of the motor (h) = lithium-ion power supply 6 power (Wh) / {motor rated power (W) × motor power factor (usually 0.9)} = 73600 / (15000 × 0.9) ≈ 5.5h. After the above technical solution is used to intelligently manage and optimize the whole vehicle, the actual working time of the motor under continuous load can reach 8.5h, and the power saving rate can reach more than 50% {power saving rate = (actual working time - theoretical working time) / theoretical working time × 100% = (8.5-5.5) / 5.5 × 100% ≈ 55%}, with significant energy saving effect. If calculated based on the average driving speed of 2.0km / h, the continuous walking distance of the machine can reach 17km. The machine only needs one person to operate independently for walking and operation, without the need for auxiliary personnel. It is easy to use, maintain, move long distances and transfer, and the charging price is cheap (the charging price during off-peak and valley periods is only about 0.3 yuan / kWh), and the comprehensive operating cost is low.

[0037] Since this machine adopts a flexible connection combination structure with rotation and swing functions between its working device 1 and the upper frame 12, it can simultaneously complete compound relative movements such as horizontal rotation of ±90° along the axis of the rotating drive device 2 and vertical swing of ±25° along the cross-hinged axis, thereby realizing flexible connection and multi-angle operation without dead ends, and significantly enhancing the functionality, adaptability and flexibility in complex working environments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A lithium-ion battery hydraulic excavator for coal mines, characterized in that: It includes working device, rotary drive device, chassis running device, slewing mechanism, operating mechanism, lithium-ion power supply, battery management unit, on-board control unit, switched reluctance speed regulating motor, hydraulic system, cooling system and upper frame; The upper frame is composed of an upper platform, a frame tilt bracket, a frame, an armrest frame, a motor mounting seat, a seat, a driving canopy and an outer hood; the upper frame is fixedly connected to the chassis running device through a slewing support of a slewing mechanism, a positioning pin and a bolt; The working device comprises a bucket, a dipper rod, a boom, a working cylinder and a bracket; the working device bracket and the outer ring of the rotary drive device are rotatably connected; The inner ring of the rotary drive device is fixedly connected to the frame yaw bracket of the upper frame; The chassis running gear and the inner ring of the slewing bearing of the slewing mechanism are fixedly connected; The outer ring of the slewing support of the slewing mechanism and the upper platform of the upper frame are rotatably connected; The operating mechanism and the upper frame are fixedly connected; The lithium-ion power source is detachably mounted on the upper platform of the upper frame; the battery management unit is built into the sealed explosion-proof housing of the lithium-ion power source; The on-board control unit is fixedly connected to the upper frame frame; the stopper of the switched reluctance speed regulating motor is positioned at the upper frame motor mounting seat, and is splined with a coupling and a plunger pump; the hydraulic system is fixedly connected to the upper frame, the chassis running device and the working device; the cooling system is fixedly connected to the upper platform and the frame of the upper frame.

2. A lithium-ion battery hydraulic excavator for coal mines according to claim 1, characterized in that: The rotary drive device has the dual functions of ±90° horizontal rotation and ±25° vertical swing; the rotary drive device is composed of a rotary reducer, a drive swing bracket, an upper lubricating bushing, an upper cross-hinged half shaft, a lower lubricating bushing, a lower cross-hinged half shaft, a swing cylinder and connecting pipelines; The rotary reducer is connected to the driving yaw bracket through bolts, and the driving yaw bracket is connected to the yaw cylinder through upper and lower cross-hinged half-axes, and the upper and lower cross-hinged half-axes are respectively provided with upper and lower lubricating bushings; the connecting pipeline is connected to the distribution valve, and the connecting pipeline is used to provide pressure oil to the rotary reducer and the yaw cylinder.

3. A lithium-ion battery hydraulic excavator for coal mines according to claim 1 or 2, characterized in that: The slewing mechanism is composed of a hydraulic motor reducer, a slewing support, a brake and a lubrication system. The slewing mechanism is fixedly connected to the upper platform of the upper frame through bolts and positioning pins.

4. A lithium-ion battery hydraulic excavator for coal mines according to claim 3, characterized in that: The battery management unit includes a BMS battery management system, a control module, a display module, a wireless communication module, and an information collection module; the BMS battery management system is connected to the wireless communication module and the display module respectively through communication interfaces, the output end of the information collection module is connected to the input end of the BMS battery management system, the output end of the BMS battery management system is connected to the input end of the control module, and the control module is respectively connected to the power supply battery pack and the vehicle-mounted control unit.

5. A lithium-ion battery hydraulic excavator for coal mines according to claim 4, characterized in that: The hydraulic system includes a plunger pump, a distribution valve, an oil source valve, a central rotary joint and a hydraulic oil tank. The plunger pump is connected to the motor mounting seat and the motor output shaft respectively through bolts and a coupling; the hydraulic system is equipped with a pressure sensor and connected to the vehicle-mounted control unit.

6. A lithium-ion battery hydraulic excavator for coal mines according to claim 5, characterized in that: The cooling system includes two independent subsystems, water cooling and oil cooling; the water cooling system is composed of a water pump motor, a switched reluctance motor cooling water channel, a water cooling radiator, an expansion water tank and a water cooling connecting pipeline; the oil cooling system is composed of a fan gear pump, a fan motor, an oil cooling radiator and an oil cooling connecting pipeline. The fan gear pump is directly connected in series to the hydraulic system plunger pump. The plunger pump and the fan gear pump work in a coaxial linkage to provide pressure and flow for the fan motor, drive the fan to rotate, and realize air suction and heat dissipation; The water-cooled radiator and the oil-cooled radiator adopt a parallel combination structure and share a cooling fan to form an integrated oil-water dual-cooling radiator; The cooling system is equipped with a temperature sensor and is connected to the vehicle-mounted control unit.

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