Motor-driven crawler excavator and working method thereof

Abstract

The invention relates to the technical field of large excavating equipment, and discloses a motor-driven crawler excavator and a working method thereof.The motor-driven crawler excavator comprises a supporting plate, the bottom of the supporting plate is rotationally connected with a rotating disc, the bottom of the rotating disc is fixedly connected with a crawler belt, and the middle of the top of the supporting plate is fixedly connected with a console; a grabbing mechanism is arranged at the top of the supporting plate, an air supply mechanism is arranged at the top of the supporting plate, and a range extender is fixedly connected to the top of the supporting plate. According to the motor-driven crawler excavator and the working method thereof, the range extender combines an engine power generation mode and a battery power supply mode. In some construction sites with imperfect electric power infrastructures, a traditional electric excavator may face the difficult problem of charging, and even under the condition that no external power source exists, the extended-range excavator can maintain work through power generation of an engine, and dependence on single electric power supply is avoided.

Description

Technical Field

[0001] This invention relates to the field of large excavation equipment technology, specifically to an electric motor-driven tracked excavator and its working method. Background Technology

[0002] Excavators primarily excavate soil, coal, silt, and pre-loosened soil and rock. In recent years, excavators have seen relatively rapid development in the construction machinery industry, becoming one of the most important pieces of machinery in engineering projects. The three most important parameters for an excavator are: operating weight (mass), engine power, and bucket capacity.

[0003] Patent announcement CN 206681050 U discloses an excavator designed to solve the problem of inefficiency caused by lifting the bucket after crushing. The key technical points are: an excavator including a bucket with teeth at the front end, a chamber between adjacent teeth, and a crushing component that can extend or retract within the chamber. The crushing component includes a crushing rod and a drive device for driving the crushing rod. In this excavator, the crushing component can retract into the bucket after crushing, improving work efficiency.

[0004] The applicant believes that the excavator has the following disadvantages: its battery capacity is limited, its continuous working time is short, and frequent charging will affect the construction progress and reduce work efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an electric motor-driven tracked excavator and its working method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a motor-driven tracked excavator, comprising a support plate, a rotating turntable rotatably connected to the bottom of the support plate, a track fixedly connected to the bottom of the rotating turntable, a control panel fixedly connected to the middle of the top of the support plate, a gripping mechanism and an air supply mechanism provided on the top of the support plate, a range extender fixedly connected to the top of the support plate, protective plates fixedly connected to both sides of the top of the support plate, a seat cushion fixedly connected to the top of the support plate, and a sunshade fixedly connected to the back of the seat cushion;

[0007] The gripping mechanism includes a mounting plate, which is fixedly connected to the top of a support plate. A support base is fixedly connected to the top of the mounting plate. A large arm is rotatably connected inside the support base. A first placement frame is fixedly connected to the bottom of the large arm. A third cylinder is rotatably connected inside the first placement frame. A second placement frame is rotatably connected to the bottom of the third cylinder. The second placement frame is fixedly connected to the left side of the support base.

[0008] Preferably, a forearm is rotatably connected to the left side of the boom, a second cylinder is rotatably connected to the top of the forearm, and a second fixed frame is rotatably connected to the right side of the second cylinder. The second fixed frame is fixedly connected to the top of the boom, and the second cylinder is connected to the forearm through the second fixed frame (fixed to the top of the boom). Its extension and retraction can drive the forearm to rotate relative to the boom around the hinge point, accurately adjusting the elevation or depression angle of the forearm, thereby adapting to the needs of different digging depths and working radii, and enhancing the flexibility and accuracy of digging operations.

[0009] Preferably, an arc-shaped plate is rotatably connected to the surface of the forearm, a second support shaft is rotatably connected inside the arc-shaped plate, a support arm is rotatably connected to the surface of the second support shaft, a support frame is rotatably connected to the side of the support arm away from the second support shaft, and a grab bucket is rotatably connected inside the support frame. The support arm and the support frame serve as a connecting structure to transmit the movement of the arc-shaped plate to the grab bucket, enabling the grab bucket to rotate flexibly around the axis and open and close.

[0010] Preferably, a first cylinder is rotatably connected to the surface of the second support shaft, and a first fixed frame is rotatably connected to the top of the first cylinder. The first fixed frame is fixedly connected to the surface of the forearm. One end of the first cylinder is rotatably connected to the second support shaft, and the other end is connected to the forearm through the first fixed frame. Its extension and retraction can directly drive the movement of the second support shaft, the arc plate, and the connected support arm and support frame, ultimately controlling the opening and closing angle and rotation amplitude of the grab bucket. It is the core power transmission component for the grab bucket to realize the "grab-close-unload" action, ensuring that the grab bucket action is precise and controllable.

[0011] Preferably, the air supply mechanism includes a placement seat, which is fixedly connected to the top of the support plate. A first motor is fixedly connected to the bottom of the placement seat, and a threaded rod is fixedly connected to the top of the first motor. A connecting frame is rotatably connected to the top of the threaded rod, and the connecting frame is fixedly connected to the top of the support plate.

[0012] Preferably, the threaded rod surface is threadedly connected to a mounting base, the top of the mounting base is fixedly connected to a horizontal plate, the top of the horizontal plate is fixedly connected to a horizontal plate, and the top of the horizontal plate is fixedly connected to a fan. The fan is mounted on the mounting base via the horizontal plate, and its height can be adjusted by the mounting base. It can deliver air to the operator or work area in a targeted manner, thereby cooling, blowing away dust, optimizing the working environment, and improving work comfort.

[0013] Preferably, a guide rod is slidably connected inside the mounting base. The guide rod is fixedly connected to the top of the placement base and slidably connected to the mounting base. When the threaded rod drives the mounting base to move up and down, the guide rod can restrict the circumferential rotation of the mounting base, ensuring that the mounting base and the fan rise and fall stably along a straight line, avoiding deviation or shaking caused by the rotation of the threaded rod, and ensuring the stability and reliability of the air supply mechanism.

[0014] Another technical problem to be solved by the present invention is to provide a working method for a motor-driven tracked excavator, so as to solve the problems mentioned in the background art above;

[0015] To achieve the above objectives, the present invention provides the following technical solution: A method for operating a motor-driven tracked excavator includes the following steps:

[0016] Step 1:

[0017] Power supply:

[0018] When the engine starts, it drives the generator to generate electricity. The electricity is directly supplied to the electric motor and stored in the battery pack, creating a continuous and flexible power supply system that can meet the power needs of different working conditions in excavation operations.

[0019] The electrical energy output from the battery pack or generator is transmitted to the electric motor, which converts the electrical energy into mechanical energy to power the drive device (such as the power source of the hydraulic system that drives the boom and forearm), replacing the traditional pure hydraulic or fuel direct drive mode and optimizing energy utilization.

[0020] Step Two:

[0021] Basic support and overall motion drive:

[0022] The mounting plate and support base form the bottom support, providing a stable foundation for the entire working device. The third cylinder can drive the first placement frame and other components, and in conjunction with the linkage of the boom and forearm, realize the lifting and extending movements of the working device in the vertical plane, and adjust the spatial position of the excavation operation;

[0023] Step 3:

[0024] The coordination between the upper arm and forearm:

[0025] The electric motor drives the hydraulic components (second cylinder, first cylinder, etc.). The extension and retraction of the second cylinder drives the boom to rotate around the hinge point and adjust the elevation angle. The extension and retraction of the first cylinder drives the forearm to swing relative to the boom. Combined with the range extender power supply to stabilize the power output, the hydraulic system pressure is kept stable and the grab bucket's working radius and height are precisely and coordinated to adapt to different digging depths and range requirements.

[0026] Step Four:

[0027] Grab bucket excavation and unloading:

[0028] The electric motor powers the hydraulic / electric actuators of the grab bucket linkage structure (first support shaft, support frame, arc plate, etc.). When the first cylinder actuates, it drives the arc plate, support frame, etc., causing the grab bucket to rotate and open / close around the shaft. During excavation, electric energy drives the grab bucket to open and insert into the material, then closes to grab it; during unloading, the grab bucket rotates and opens to unload the material. Components such as the support arm and second support shaft work together, relying on a range extender power supply to continuously and stably supply power, ensuring flexible rotation and support of the grab bucket connection parts, improving the accuracy and stability of the grab bucket's movements, and adapting to various excavation angles and force requirements.

[0029] Compared with the prior art, the present invention provides an electric motor-driven tracked excavator and its working method, which has the following beneficial effects:

[0030] 1. This motor-driven tracked excavator and its working method: When the battery power of the range-extended excavator is insufficient, the engine in the range extender can generate electricity in time to supplement the power, extending the continuous working time of the equipment. Taking a large-scale earthmoving excavation project as an example, a traditional electric excavator may need to be charged every 2-3 hours, while a range-extended excavator can work continuously for 6-8 hours, reducing charging waiting time and improving construction efficiency.

[0031] 2. This motor-driven tracked excavator and its operating method utilize a range extender that combines engine power generation and battery power supply. In construction sites with inadequate power infrastructure, traditional electric excavators may face charging difficulties, while range-extended excavators can maintain operation even without an external power source, relying on engine power generation to eliminate dependence on a single power supply. For example, when constructing roads in remote mountainous areas, range-extended excavators can operate normally, while traditional electric excavators may be forced to stop working due to charging difficulties.

[0032] 3. The tracked excavator driven by the motor and its working method: the fan is mounted on the mounting base via a horizontal plate. Its height can be adjusted by the mounting base. It can deliver air to the operator or work area in a targeted manner, which can cool down, blow away dust, optimize the operating environment, and improve the comfort of operation. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the overall structure of the present invention from an oblique angle.

[0036] Figure 3 This is a partial structural diagram of the present invention;

[0037] Figure 4 This is a front view of the overall structure of the present invention;

[0038] Figure 5 This is a schematic diagram of the gripping mechanism of the present invention;

[0039] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0040] Figure 7 This is a schematic diagram of the air supply mechanism of the present invention.

[0041] In the diagram: 1. Support plate; 2. Grabbing mechanism; 21. Grab bucket; 22. First support shaft; 23. Support frame; 24. Arc plate; 25. First cylinder; 26. First fixed frame; 27. Second cylinder; 28. Forearm; 29. ​​Boom; 201. First placement frame; 202. Third cylinder; 203. Second placement frame; 204. Mounting plate; 205. Support seat; 206. Second fixed frame; 207. Support arm; 208. Second support shaft; 3. Air supply mechanism; 31. Placement seat; 32. Threaded rod; 33. First motor; 34. Connecting frame; 35. Guide rod; 36. Mounting seat; 37. Second motor; 38. Fan; 39. Horizontal plate; 4. Range extender; 5. Control panel; 6. Track; 7. Protective plate; 8. Seat cushion; 9. Sun visor. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention provides a technical solution:

[0044] Example 1:

[0045] Combination Figure 1-4 to Figure 5-6A tracked excavator driven by an electric motor includes a support plate 1, a rotating turntable rotatably connected to the bottom of the support plate 1, a track 6 fixedly connected to the bottom of the rotating turntable, a control panel 5 fixedly connected to the middle of the top of the support plate 1, a gripping mechanism 2 and an air supply mechanism 3 on the top of the support plate 1, a range extender 4 fixedly connected to the top of the support plate 1, protective plates 7 fixedly connected to both sides of the top of the support plate 1, a seat 8 fixedly connected to the top of the support plate 1, and a sunshade 9 fixedly connected to the back of the seat 8.

[0046] The gripping mechanism 2 includes a mounting plate 204, which is fixedly connected to the top of the support plate 1. A support base 205 is fixedly connected to the top of the mounting plate 204. A large arm 29 is rotatably connected inside the support base 205. A first placement frame 201 is fixedly connected to the bottom of the large arm 29. A third cylinder 202 is rotatably connected inside the first placement frame 201. A second placement frame 203 is rotatably connected to the bottom of the third cylinder 202. The second placement frame 203 is fixedly connected to the left side of the support base 205.

[0047] Furthermore, a forearm 28 is rotatably connected to the left side of the boom 29, and a second cylinder 27 is rotatably connected to the top of the forearm 28. A second fixed frame 206 is rotatably connected to the right side of the second cylinder 27. The second fixed frame 206 is fixedly connected to the top of the boom 29. The second cylinder 27 is connected to the forearm 28 through the second fixed frame 206 (fixed to the top of the boom 29). Its extension and retraction can drive the forearm 28 to rotate relative to the boom 29 around the hinge point, precisely adjusting the elevation or depression angle of the forearm 28, thereby adapting to the needs of different digging depths and working radii, and enhancing the flexibility and accuracy of digging operations.

[0048] Furthermore, an arc-shaped plate 24 is rotatably connected to the surface of the forearm 28, and a second support shaft 208 is rotatably connected inside the arc-shaped plate 24. A support arm 207 is rotatably connected to the surface of the second support shaft 208, and a support frame 23 is rotatably connected to the side of the support arm 207 away from the second support shaft 208. A grab bucket 21 is rotatably connected inside the support frame 23. The support arm 207 and the support frame 23 serve as a connecting structure to transmit the movement of the arc-shaped plate 24 to the grab bucket 21, enabling the grab bucket 21 to rotate flexibly around the axis and open and close.

[0049] Furthermore, a first cylinder 25 is rotatably connected to the surface of the second support shaft 208, and a first fixed frame 26 is rotatably connected to the top of the first cylinder 25. The first fixed frame 26 is fixedly connected to the surface of the forearm 28. One end of the first cylinder 25 is rotatably connected to the second support shaft 208, and the other end is connected to the forearm 28 through the first fixed frame 26. Its extension and retraction can directly drive the second support shaft 208, the arc plate 24, and the connected support arm 207 and support frame 23 to move, ultimately controlling the opening and closing angle and rotation amplitude of the grab bucket 21. It is the core power transmission component for the grab bucket 21 to realize the "grab-close-unload" action, ensuring that the action of the grab bucket 21 is precise and controllable.

[0050] Example 2:

[0051] See Figure 7 Furthermore, based on Embodiment 1, the air supply mechanism 3 further includes a placement seat 31, which is fixedly connected to the top of the support plate 1. A first motor 33 is fixedly connected to the bottom of the placement seat 31, and a threaded rod 32 is fixedly connected to the top of the first motor 33. A connecting frame 34 is rotatably connected to the top of the threaded rod 32, and the connecting frame 34 is fixedly connected to the top of the support plate 1.

[0052] Furthermore, a mounting base 36 is threadedly connected to the surface of the threaded rod 32. A horizontal plate 39 is fixedly connected to the top of the mounting base 36. A fan 38 is fixedly connected to the top of the horizontal plate 39. The fan 38 is mounted on the mounting base 36 via the horizontal plate 39. Its height can be adjusted by the mounting base 36. It can deliver air to the operator or work area in a targeted manner, thereby cooling and blowing away dust, optimizing the working environment and improving work comfort.

[0053] Furthermore, a guide rod 35 is slidably connected inside the mounting base 36. The guide rod 35 is fixedly connected to the top of the placement base 31 and slidably connected to the mounting base 36. When the threaded rod 32 drives the mounting base 36 to move up and down, the guide rod 35 can restrict the circumferential rotation of the mounting base 36, ensuring that the mounting base 36 and the fan 38 rise and fall stably along a straight line, avoiding deviation or shaking caused by the rotation of the threaded rod 32, and ensuring the stability and reliability of the operation of the air supply mechanism 3.

[0054] To achieve the above objectives, the present invention provides the following technical solution: A method for operating a motor-driven tracked excavator includes the following steps:

[0055] Step 1:

[0056] Power supply:

[0057] When the engine starts, it drives the generator to generate electricity. The electricity is directly supplied to the electric motor and stored in the battery pack, creating a continuous and flexible power supply system that can meet the power needs of different working conditions in excavation operations.

[0058] The electrical energy output from the battery pack or generator is transmitted to the electric motor, which converts the electrical energy into mechanical energy to power the drive device (such as the hydraulic system power source that drives the boom 29 and forearm 28), replacing the traditional pure hydraulic or fuel direct drive mode and optimizing energy utilization.

[0059] Step Two:

[0060] Basic support and overall motion drive:

[0061] Mounting plate 204 and support base 205 form the bottom support, providing a stable foundation for the entire working device. The third cylinder 202 can drive the first placement frame 201 and other components, and in conjunction with the linkage of the boom 29 and the forearm 28, realize the lifting and extending movements of the working device in the vertical plane, and adjust the spatial position of the excavation operation;

[0062] Step 3:

[0063] Linkage between upper arm 29 and forearm 28:

[0064] The electric motor drives the hydraulic components (second cylinder 27, first cylinder 25, etc.). The extension and retraction of the second cylinder 27 drives the boom 29 to rotate around the hinge point to adjust the elevation angle. The extension and retraction of the first cylinder 25 drives the forearm 28 to swing relative to the boom 29. Combined with the range extender power supply to stabilize the power output, the hydraulic system pressure is kept stable, and the working radius and height of the grab bucket 21 are precisely and collaboratively adjusted to adapt to different digging depths and range requirements.

[0065] Step Four:

[0066] Excavation and unloading of grab bucket 21:

[0067] The electric motor powers the hydraulic / electric actuators of the grab bucket 21's linkage structure (first support shaft 22, support frame 23, arc plate 24, etc.). When the first cylinder 25 actuates, it drives the arc plate 24, support frame 23, etc., causing the grab bucket 21 to rotate and open / close around its axis. During excavation, the electric energy drives the grab bucket 21 to open and insert material, then closes to grab it; during unloading, the grab bucket 21 rotates and opens to unload material. Components such as the support arm and second support shaft 208 work together, relying on a range-extended power supply to continuously and stably supply power, ensuring flexible rotation and support of the grab bucket 21's connecting parts, improving the accuracy and stability of the grab bucket 21's movements, and adapting to various excavation angles and force requirements.

[0068] The working principle of this excavator:

[0069] With the range-extended mobile power station as the power core, it provides stable power to the excavating working device (including components such as boom 29, forearm 28, grab bucket 21, etc.). The engine, generator, battery pack, and electric motor form the power transmission link. The support base 205 and mounting plate 204 ensure the stability of the device foundation. Each cylinder and articulated structure works together to realize the operation.

[0070] Power supply:

[0071] When the engine starts, it drives the generator to generate electricity. The electricity is directly supplied to the electric motor and stored in the battery pack, creating a continuous and flexible power supply system that can meet the power needs of different working conditions in excavation operations.

[0072] The electrical energy output from the battery pack or generator is transmitted to the electric motor, which converts the electrical energy into mechanical energy to power the drive device (such as the hydraulic system power source that drives the boom 29 and forearm 28), replacing the traditional pure hydraulic or fuel direct drive mode and optimizing energy utilization.

[0073] Basic support and overall motion drive:

[0074] Mounting plate 204 and support base 205 form the bottom support, providing a stable foundation for the entire working device. The third cylinder 202 can drive the first placement frame 201 and other components, and in conjunction with the linkage of the boom 29 and the forearm 28, realize the lifting and extending movements of the working device in the vertical plane, and adjust the spatial position of the excavation operation;

[0075] Linkage between upper arm 29 and forearm 28:

[0076] The electric motor drives the hydraulic components (second cylinder 27, first cylinder 25, etc.). The extension and retraction of the second cylinder 27 drives the boom 29 to rotate around the hinge point to adjust the elevation angle. The extension and retraction of the first cylinder 25 drives the forearm 28 to swing relative to the boom 29. Combined with the range extender power supply to stabilize the power output, the hydraulic system pressure is kept stable, and the working radius and height of the grab bucket 21 are precisely and collaboratively adjusted to adapt to different digging depths and range requirements.

[0077] Excavation and unloading of grab bucket 21:

[0078] The electric motor powers the hydraulic / electric actuators of the grab bucket 21's linkage structure (first support shaft 22, support frame 23, arc plate 24, etc.). When the first cylinder 25 actuates, it drives the arc plate 24, support frame 23, etc., causing the grab bucket 21 to rotate and open / close around the axis. During excavation, electric energy drives the grab bucket 21 to open and insert material, then closes to grab it; during unloading, the grab bucket 21 rotates and opens to unload material. Components such as the support arm and second support shaft 208 work together, relying on a range-extended power supply to continuously and stably supply power, ensuring flexible rotation and support of the grab bucket 21's connecting parts, improving the accuracy and stability of the grab bucket 21's movements, and adapting to various excavation angles and force requirements.

[0079] When air supply is needed in hot weather, the first motor 33 is started, which drives the threaded rod 32 to rotate and the mounting base 36 to move up and down. This allows for accurate air supply according to the height of the staff. After the height is adjusted, the second motor 37 is started, which drives the fan 38 to rotate, thus achieving the purpose of air supply.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A motor-driven tracked excavator, comprising a support plate (1), characterized in that: The bottom of the support plate (1) is rotatably connected to a rotating turntable, the bottom of the rotating turntable is fixedly connected to a track (6), the top middle of the support plate (1) is fixedly connected to a control panel (5), the top of the support plate (1) is provided with a gripping mechanism (2), the top of the support plate (1) is provided with an air supply mechanism (3), the top of the support plate (1) is fixedly connected to a range extender (4), the top two sides of the support plate (1) are fixedly connected to protective plates (7), the top of the support plate (1) is fixedly connected to a seat cushion (8), and the back of the seat cushion (8) is fixedly connected to a sunshade (9). The gripping mechanism (2) includes a mounting plate (204), which is fixedly connected to the top of the support plate (1). A support base (205) is fixedly connected to the top of the mounting plate (204). A large arm (29) is rotatably connected inside the support base (205). A first placement frame (201) is fixedly connected to the bottom of the large arm (29). A third cylinder (202) is rotatably connected inside the first placement frame (201). A second placement frame (203) is rotatably connected to the bottom of the third cylinder (202). The second placement frame (203) is fixedly connected to the left side of the support base (205).

2. The electric motor-driven tracked excavator according to claim 1, characterized in that: The upper arm (29) is rotatably connected to the lower arm (28) on the left side, and the top of the lower arm (28) is rotatably connected to the second cylinder (27). The right side of the second cylinder (27) is rotatably connected to the second fixing frame (206), and the second fixing frame (206) is fixedly connected to the top of the upper arm (29).

3. The electric motor-driven tracked excavator according to claim 1, characterized in that: An arc-shaped plate (24) is rotatably connected to the surface of the forearm (28), and a second support shaft (208) is rotatably connected inside the arc-shaped plate (24). A support arm (207) is rotatably connected to the surface of the second support shaft (208), and a support frame (23) is rotatably connected to the side of the support arm (207) away from the second support shaft (208). A grab bucket (21) is rotatably connected inside the support frame (23).

4. A motor-driven tracked excavator according to claim 3, characterized in that: The second support shaft (208) is rotatably connected to the surface of the first cylinder (25), and the top of the first cylinder (25) is rotatably connected to the first fixing frame (26), which is fixedly connected to the surface of the forearm (28).

5. A motor-driven tracked excavator according to claim 1, characterized in that: The air supply mechanism (3) includes a placement seat (31), which is fixedly connected to the top of the support plate (1). A first motor (33) is fixedly connected to the bottom of the placement seat (31), and a threaded rod (32) is fixedly connected to the top of the first motor (33). A connecting frame (34) is rotatably connected to the top of the threaded rod (32), and the connecting frame (34) is fixedly connected to the top of the support plate (1).

6. A motor-driven tracked excavator according to claim 5, characterized in that: The threaded rod (32) is threadedly connected to a mounting base (36), and a horizontal plate (39) is fixedly connected to the top of the mounting base (36). A fan (38) is fixedly connected to the top of the horizontal plate (39).

7. A motor-driven tracked excavator according to claim 6, characterized in that: A guide rod (35) is slidably connected inside the mounting base (36), and the guide rod (35) is fixedly connected to the top of the placement base (31).

8. A method for operating a motor-driven tracked excavator, applied to a motor-driven tracked (6) excavator as described in any one of claims 1-7, comprising the following steps: Step 1: Power supply: When the engine starts, it drives the generator to generate electricity. The electricity is directly supplied to the electric motor and stored in the battery pack, creating a continuous and flexible power supply system that can meet the power needs of different working conditions in excavation operations. The electrical energy output from the battery pack or generator is transmitted to the electric motor, which converts the electrical energy into mechanical energy to provide power for the hydraulic system power source of the boom (29) and forearm (28) movement, replacing the traditional pure hydraulic or fuel direct drive mode and optimizing energy utilization; Step Two: Basic support and overall motion drive: The mounting plate (204) and support base (205) form the bottom support, providing a stable foundation for the entire working device. The third cylinder (202) can drive the first placement frame (201) component, and in conjunction with the linkage of the boom (29) and the forearm (28), realize the lifting and extending actions of the working device in the vertical plane, and adjust the spatial position of the excavation operation. Step 3: Linkage between the upper arm (29) and forearm (28): The electric motor drives the hydraulic components, the second cylinder (27) and the first cylinder (25). The second cylinder (27) extends and retracts to drive the boom (29) to rotate around the hinge point and adjust the elevation angle. The first cylinder (25) extends and retracts to drive the forearm (28) to swing relative to the boom (29). Combined with the range extender power supply to stabilize the power output, the hydraulic system pressure is stabilized, and the working radius and height of the grab bucket (21) are precisely coordinated to adapt to different digging depths and range requirements. Step Four: Excavation and unloading of the grab bucket (21): The electric motor is linked to the grab bucket (21). The hydraulic / electric actuators of the first support shaft (22), support frame (23), and arc plate (24) provide power. When the first cylinder (25) is activated, it drives the arc plate (24) and support frame (23), causing the grab bucket (21) to rotate and open around the axis. During excavation, the electric energy drives the grab bucket (21) to open and insert the material, and then close to grab it. During unloading, the grab bucket (21) rotates and opens to unload the material. The support arm (207) and second support shaft (208) cooperate to continuously and stably supply electric power with the range extender, ensuring that the connection part of the grab bucket (21) can rotate flexibly and support, improving the accuracy and stability of the grab bucket (21) and adapting to various excavation angle and force requirements.

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