An electric overhead contact line maintenance ladder truck

Abstract

This invention discloses an electric overhead contact line maintenance ladder truck, comprising a ladder truck chassis, a detachable ladder frame, and a work platform. The ladder truck chassis is fixedly equipped with a drive battery pack, a transmission system, a wheel set, and an anti-tipping gripper. The detachable ladder frame can be divided into upper, middle, and lower parts, and a tensioning wheel is rotatably connected to each of the three parts. The advantages of this invention are: compared with existing technologies, the design of this electric overhead contact line maintenance ladder truck allows for electric control of the ladder truck's movement, greatly improving the efficiency of the maintenance work. It also eliminates the need for personnel to provide safety protection below the ladder truck, saving labor costs for enterprises. The anti-tipping device design ensures that the ladder truck will not tip over during operation, improving the safety performance of the ladder truck and guaranteeing the safety of maintenance personnel. The detachable ladder frame design facilitates the daily transportation of the ladder truck.

Description

Technical Field

[0001] This invention belongs to the technical field of overhead contact line maintenance ladders for electrified railways, specifically an electric overhead contact line maintenance ladder. Background Technology

[0002] With the rapid development of China's railway transportation, the mileage of electrified railways and high-speed passenger dedicated lines has greatly increased, and the workload of overhead contact line inspection and maintenance has increased accordingly. This means that my country's overhead contact line maintenance will face enormous challenges, requiring high work efficiency and safety in daily overhead contact line maintenance work.

[0003] The main problems with the existing technology are as follows:

[0004] 1. When the manual maintenance ladder is in operation, it requires 4-6 people to push the ladder, which results in high labor costs; the ladder structure is mainly a whole connection, the ladder frame cannot be disassembled, it occupies a large area and is not easy to transport; the ladder chassis and ladder frame are generally made of steel, which is heavy and not easy to work with and move.

[0005] Second, the possibility of manual ladder carts tipping over during operation is increasing, especially during overhead contact line maintenance in windy weather, particularly in strong winds. Ladder carts moving normally along the tracks or parked on the tracks for maintenance are subject to strong lateral wind impacts, greatly increasing the risk of tipping over. Furthermore, when workers climb onto the work platform using the detachable ladder, uneven pressure on the ladder cart chassis below can easily cause the platform to sway, leading to panic and potentially causing the ladder cart to tip over. When the ladder cart travels to a curve in the railway, where the two sides of the rail are at different heights, the tilt of the maintenance platform is very severe, which may also cause the ladder cart to tip over. All of these situations pose dangers to workers, affect work efficiency, and result in significant economic losses. Summary of the Invention

[0006] The purpose of this invention is to provide an electric overhead contact line maintenance ladder to solve the above-mentioned problems, which solves the problems of existing manual ladders being heavy, difficult to work and move, and prone to tipping over in windy weather.

[0007] To address the above problems, the present invention provides a technical solution:

[0008] An electric overhead contact line maintenance ladder truck includes a ladder truck chassis, a detachable ladder frame, and a work platform. A drive battery pack, a transmission system, a wheel set, and an anti-tipping gripper are fixedly mounted on the ladder truck chassis. The detachable ladder frame is divided into upper, middle, and lower sections, and a tensioning wheel is rotatably connected to each of the three sections. Two tensioning ropes are wound around several tensioning wheels. Both tensioning ropes are bundles of nylon fibers, and one end of each tensioning rope is fixedly connected to the anti-tipping gripper. The two tensioning ropes are located away from the anti-tipping gripper. One end of each of the two rope reels is fixedly connected to a rope reel. A rotating drum is fixedly connected to the sidewall of each of the two rope reels facing each other. A first bearing seat is fixedly connected between the two rope reels and the rotating drum. The two first bearing seats are fixedly connected to the upper surface of the work platform. An operating handle is fixedly connected to the center of the outer sidewall of the rotating drum. The upper end of the operating handle abuts against the top of the work platform. A pawl is fixedly installed at the top of the work platform. A ratchet is fixedly sleeved on one of the rope reels corresponding to the pawl. The pawl and the ratchet engage.

[0009] Preferably, the ladder truck chassis includes two longitudinal beams, which are fixedly connected to the lower end of the detachable ladder frame. Several transverse beams are fixedly connected to the side walls of the two longitudinal beams on opposite sides, and a short longitudinal beam is fixedly connected to the two transverse beams.

[0010] Preferably, the detachable ladder frame includes several sub-ladder frames, four of which are fixedly connected in a matrix to the upper surface of two longitudinal beams. Each of the sub-ladder frames is fixedly connected with a two-phase conduit. A threaded fastener is fixedly connected to the connection between the sub-ladder frames. Each pair of adjacent sub-ladder frames is engaged by a threaded fastener. An inclined tie rod is fixedly connected to the opposite side of the wall of each pair of corresponding sub-ladder frames. Four three-phase conduits are fixedly sleeved at the top of the four sub-ladder frames. The tops of the four three-phase conduits are jointly fixedly sleeved at the lower end of the work platform.

[0011] Preferably, the transmission system includes a splined shaft, one end of which is fixedly connected to the output end of the drive battery pack. The end of the splined shaft away from the drive battery pack is fixedly connected to a connecting shaft. The end of the connecting shaft away from the splined shaft is fixedly connected to a gear commutator. A second bearing housing is fixedly connected to the lower surface of the gear commutator. The second bearing housing is fixedly connected to the center of the upper surface of one of the transverse beams. The output end of the gear commutator is symmetrically connected to two couplings. The gear commutator is fixedly connected to two drive shafts respectively through the two couplings.

[0012] Preferably, the anti-overturning gripper includes four baffles, which are respectively fixedly connected to the sidewalls of two longitudinal beams on opposite sides. Two movable pins are rotatably connected between the opposing inner sidewalls of the baffles near their lower ends via bearings. A contoured gripper claw is fixedly sleeved on each of the two movable pins. Two fixed shaft pins are provided on the upper inner sidewalls of the baffles corresponding to the two contoured gripper claws, and these two fixed shaft pins are respectively engaged with the corresponding contoured gripper claw. A piston rod is fixedly connected to one of the contoured gripper claws. The upper end of the piston rod penetrates the upper surface of the baffle and extends upwards beyond the baffle, and is fixedly connected to the tension rope. The anti-overturning gripper is made of Q235 steel.

[0013] Preferably, four connecting supports are fixedly connected in a matrix on the sidewalls of the two longitudinal beams on the side away from each other. A driven wheel bracket is fixedly connected to the upper surface of each of the four connecting supports. A wheel set is fixedly connected to one end of each of the four driven wheel brackets. Two of the driven wheel brackets are fixedly connected to two corresponding drive shafts respectively.

[0014] Preferably, each of the four driven wheel brackets includes a fixed shaft bracket. The four fixed shaft brackets are respectively fixedly connected to the upper surface of the four connecting supports. Each of the four fixed shaft brackets has a bearing fixedly sleeved inside. Each of the four bearings has a fixed shaft fixedly sleeved inside. One end of each of the two fixed shafts is fixedly connected to two corresponding drive shafts. The other end of each of the four fixed shafts is fixedly connected to a sleeve. The end of each of the four sleeves away from the fixed shaft is threaded with four anti-loosening nuts. Each of the four sleeves is fixedly installed to the corresponding wheel assembly through the four anti-loosening nuts.

[0015] Preferably, the drive battery pack is fixedly installed on the upper surface of the short longitudinal beam. The drive battery pack is a lithium battery with the parameter setting of SDA10-4850 / 48V50AH. A DC brushed motor is fixedly installed at the output end of the drive battery pack. The output end of the DC brushed motor is fixedly connected to the end of the spline shaft near the DC brushed motor.

[0016] The beneficial effects of this invention are as follows: The design of an electric overhead contact line maintenance ladder cart, compared with existing technologies, enables electric control of the ladder cart's movement, greatly improving the efficiency of overhead contact line maintenance work. Simultaneously, it eliminates the need for personnel to provide safety protection below the ladder cart, saving labor costs for enterprises. The anti-tipping device design ensures that the ladder cart will not tip over during operation, improving the safety performance of the ladder cart and guaranteeing the safety of maintenance personnel. The detachable ladder frame design facilitates the daily transportation of the ladder cart. Attached Figure Description

[0017] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a front view of an electric overhead contact line maintenance ladder truck according to the present invention;

[0019] Figure 2 This is a side view of an electric overhead contact line maintenance ladder vehicle according to the present invention;

[0020] Figure 3 This is a bottom view of the chassis structure of an electric overhead contact line maintenance ladder truck according to the present invention;

[0021] Figure 4 This is a structural diagram of the operating system of an anti-tipping device for an electric overhead contact line maintenance ladder truck according to the present invention;

[0022] Figure 5 This is a structural diagram of the anti-tipping device rail-grabbing system for an electric overhead contact line maintenance ladder vehicle according to the present invention;

[0023] Figure 6 This is a structural diagram of a detachable ladder frame for an electric overhead contact line maintenance ladder vehicle according to the present invention;

[0024] Figure 7 This is a structural diagram of the driven wheel bracket of an electric overhead contact line maintenance ladder trolley according to the present invention.

[0025] In the diagram: 1. Ladder chassis; 1.1. Longitudinal beam; 1.2. Short longitudinal beam; 1.3. Transverse beam; 2. Detachable ladder frame; 2.1. Sub-ladder frame; 2.2. Threaded fastener; 2.3. Diagonal tie rod; 3. Working platform; 4. Drive battery pack; 5. Transmission system; 5.1. Splined shaft; 5.2. Connecting shaft; 5.3. Gear commutator; 5.4. Drive shaft; 5.5. Second bearing housing; 5.6. Coupling; 6. Wheel set; 7. Anti-tipping gripper; 7.1. Piston rod; 7 7.2. Baffle; 7.3. Fixed shaft pin; 7.4. Movable shaft pin; 7.5. Contour rail gripper; 8. Rope reel; 9. First bearing seat; 10. Ratchet; 11. Tensioning rope; 12. Operating handle; 13. Three-phase pipe; 14. Tensioning wheel; 15. Two-phase pipe; 16. Connecting support; 17. Rotating drum; 18. Pawl; 19. Driven wheel bracket; 19.1. Fixed shaft bracket; 19.2. Fixed shaft; 19.3. Bearing; 19.4. Sleeve; 19.5. Anti-loosening nut. Detailed Implementation

[0026] like Figure 1-7 As shown, the specific implementation adopts the following technical solution:

[0027] An electric overhead contact line maintenance ladder truck includes a ladder truck chassis 1, a detachable ladder frame 2, and a work platform 3. A drive battery pack 4, a transmission system 5, a wheel set 6, and an anti-tipping gripper 7 are fixedly mounted on the ladder truck chassis 1. The detachable ladder frame 2 can be divided into upper, middle, and lower parts, and a tensioning wheel 14 is rotatably connected to each of the three parts. Two tensioning ropes 11 are wound around several tensioning wheels 14. Both tensioning ropes 11 are bundles of nylon fibers, and one end of each tensioning rope 11 is fixedly connected to the anti-tipping gripper 7. The two tensioning ropes 11 are located away from the anti-tipping gripper 7. A rope reel 8 is fixedly connected to one end of each of the two rope reels 8. A rotating drum 17 is fixedly connected to the side wall of the two rope reels 8 facing each other. A first bearing seat 9 is fixedly connected between the two rope reels 8 and the rotating drum 17. The two first bearing seats 9 are fixedly connected to the upper surface of the work platform 3. An operating handle 21 is fixedly connected to the center of the outer side wall of the rotating drum 17. The upper end of the operating handle 21 abuts against the top of the work platform 3. A pawl 18 is fixedly installed at the top of the work platform 3. A ratchet 10 is fixedly sleeved on one of the rope reels 8 corresponding to the pawl 18. The pawl 18 and the ratchet 10 mesh.

[0028] The ladder chassis 1 includes two longitudinal beams 1.1, which are fixedly connected to the lower end of the detachable ladder frame 2. Several transverse beams 1.3 are fixedly connected to the side walls of the two longitudinal beams 1.1 facing each other, and a short longitudinal beam 1.2 is fixedly connected to the two transverse beams 1.3.

[0029] The detachable ladder frame 2 includes several sub-ladder frames 2.1, of which four sub-ladder frames 2.1 are fixedly connected in a matrix to the upper surface of two longitudinal beams 1.1. The sub-ladder frames 2.1 are all fixedly connected by two-phase pipes 15. A threaded fastener 2.2 is fixedly connected at the connection between the sub-ladder frames 2.1. Every two adjacent sub-ladder frames 2.1 are engaged by the threaded fastener 2.2. An inclined tie rod 2.3 is fixedly connected to the wall of every two corresponding sub-ladder frames 2.1 on the opposite side. Four three-phase pipes 13 are fixedly sleeved at the top of the four sub-ladder frames 2.1. The tops of the four three-phase pipes 13 are fixedly sleeved at the lower end of the work platform 3.

[0030] The transmission system 5 includes a splined shaft 5.1, one end of which is fixedly connected to the output end of the drive battery pack 4. The end of the splined shaft 5.1 away from the drive battery pack 4 is fixedly connected to a connecting shaft 5.2. The end of the connecting shaft 5.2 away from the splined shaft 5.1 is fixedly connected to a gear commutator 5.3. A second bearing seat 5.5 is fixedly connected to the lower surface of the gear commutator 5.3. The second bearing seat 5.5 is fixedly connected to the center of the upper surface of one of the transverse beams 1.3. The output end of the gear commutator 5.3 is symmetrically connected to two couplings 5.6. The gear commutator 5.3 is fixedly connected to two drive shafts 5.4 through the two couplings 5.6 respectively.

[0031] The anti-overturning gripper 7 includes four baffles 7.2, which are fixedly connected to the side walls of the two longitudinal beams 1.1 on opposite sides. Two movable pins 7.4 are rotatably connected between the inner side walls of the baffles 7.2 near the lower end via bearings. A contoured gripper 7.5 is fixedly sleeved on each of the two movable pins 7.4. Two fixed shaft pins 7.3 are provided on the inner side wall of the baffle 5.1 corresponding to the two contoured gripper 7.5. The two fixed shaft pins 7.3 are respectively engaged with the corresponding contoured gripper 7.5. A piston rod 7.1 is fixedly connected to one of the contoured gripper 7.5. The upper end of the piston rod 7.1 penetrates the upper surface of the baffle 7.2 and extends upward to the outside of the baffle 7.2, and is fixedly connected to the tension rope 11. The anti-overturning gripper 7 is made of Q235 steel.

[0032] Among them, four connecting supports 16 are fixedly connected in a matrix on the sidewall of the two longitudinal beams 1.1 on the side away from each other. A driven wheel bracket 19 is fixedly connected to the upper surface of each of the four connecting supports 16. A wheel set 6 is fixedly connected to one end of each of the four driven wheel brackets 19. Two of the driven wheel brackets 19 are fixedly connected to two corresponding drive shafts 5.4 respectively.

[0033] Each of the four driven wheel brackets 19 includes a fixed shaft bracket 19.1. The four fixed shaft brackets 19.1 are fixedly connected to the upper surface of the four connecting supports 16. Each of the four fixed shaft brackets 19.1 has a bearing 19.3 fixedly sleeved inside, and each of the four bearings 19.3 has a fixed shaft 19.2 fixedly sleeved inside. One end of two of the fixed shafts 19.2 is fixedly connected to two corresponding drive shafts 5.4. The other end of each of the four fixed shafts 19.2 is fixedly connected to a sleeve 19.4. The end of each of the four sleeves 19.4 away from the fixed shaft 19.2 is threaded with four anti-loosening nuts 19.5. Each of the four sleeves 19.4 is fixedly installed to the corresponding wheel set 6 by the four anti-loosening nuts 19.5.

[0034] Among them, the drive battery pack 4 is fixedly installed on the upper surface of the short longitudinal beam 1.2. The drive battery pack 4 is a lithium battery with the parameter determination model SDA10-4850 / 48V50AH. A DC brushed motor is fixedly installed at the output end of the drive battery pack 4. The output end of the DC brushed motor is fixedly connected to the end of the spline shaft 5.1 near the DC brushed motor.

[0035] The invention relates to an electric overhead contact line maintenance ladder trolley. During use, a drive battery pack 4 provides power to a DC brushed motor. The DC brushed motor drives a connecting shaft 5.2 to rotate via a splined shaft 5.1. The connecting shaft 5.2 drives two drive shafts 5.4 to rotate synchronously via a gear commutator 5.3. The drive shafts 5.4 drive a wheel set 6 to rotate via a driven wheel bracket 19. The wheel set 6 then rolls on the railway track, moving the ladder trolley. When the desired position is reached, the rotating drum 17 can be rotated via the operating handle 12. The rotating drum 17 drives a rope reel 8 to rotate, which in turn retracts and winds the tension rope 11 onto the reel, tauting the section of the tension rope 11 outside the reel 8. Wheel 14 stabilizes the detachable ladder frame 2 as a whole. At the same time, when the tension rope 11 is taut, it pulls the piston rod 7.1 upward. The piston rod 7.1 pulls the contoured rail gripper 7.5 upward, causing the two contoured rail grippers 7.5 to move towards each other, thereby clamping and fixing the railway rail. After stabilizing and positioning the frame, the ratchet 18 is pressed down to engage with the ratchet wheel 10, which can prevent the rotating drum 17 and the rope disc 8 from rotating, thus preventing the frame from becoming loose and moving at will. Since the frame is spliced ​​together by the sub-ladder frame 1.1 and the two-phase pipe 15 and installed and fixed by the threaded fastener 2.2, and its structure is stabilized and supported by the diagonal tie rod 1.3, it can be disassembled when not in use or during movement for easy transport.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An electric catenary maintenance trolley, characterized in that The utility model relates to a detachable ladder frame (2) and working platform (3) are connected, and the detachable ladder frame (2) can be divided into upper, middle and lower three parts, and the connecting place between the three parts of detachable ladder frame (2) is rotatably connected with a tension pulley (14), and a plurality of tension pulleys (14) are commonly wound with two tension ropes (11), two tension ropes (11) are all the nylon fiber tow of several nylon fiber filaments, one end of two tension ropes (11) is fixedly connected with the anti-overturning grab (7), and the end away from the anti-overturning grab (7) of two tension ropes (11) is fixedly connected with a rope disc (8), two rope discs (8) are commonly fixedly connected with a rotating drum (17) on the side wall of the opposite side, a first bearing seat (9) is fixedly connected between two rope discs (8) and rotating drum (17), two first bearing seats (9) are fixedly connected on the upper surface of working platform (3), the center of the outer side wall of rotating drum (17) is fixedly connected with an operating handle (12), the upper end rod wall of operating handle (12) is abutted with the top end of working platform (3), the top end of working platform (3) is fixedly installed with a ratchet pawl (18), and a ratchet wheel (10) is fixedly sleeved on one of the rope discs (8) corresponding to the ratchet pawl (18), and the ratchet pawl (18) is engaged with the ratchet wheel (10); The utility model relates to a detachable ladder frame (2) and working platform (3) are connected, and the detachable ladder frame (2) can be divided into upper, middle and lower three parts, and the connecting place between the three parts of detachable ladder frame (2) is rotatably connected with a tension pulley (14), and a plurality of tension pulleys (14) are commonly wound with two tension ropes (11), two tension ropes (11) are all the nylon fiber tow of several nylon fiber filaments, one end of two tension ropes (11) is fixedly connected with the anti-overturning grab (7), and the end away from the anti-overturning grab (7) of two tension ropes (11) is fixedly connected with a rope disc (8), two rope discs (8) are commonly fixedly connected with a rotating drum (17) on the side wall of the opposite side, a first bearing seat (9) is fixedly connected between two rope discs (8) and rotating drum (17), two first bearing seats (9) are fixedly connected on the upper surface of working platform (3), the center of the outer side wall of rotating drum (17) is fixedly connected with an operating handle (12), the upper end rod wall of operating handle (12) is abutted with the top end of working platform (3), the top end of working platform (3) is fixedly installed with a ratchet pawl (18), and a ratchet wheel (10) is fixedly sleeved on one of the rope discs (8) corresponding to the ratchet pawl (18), and the ratchet pawl (18) is engaged with the ratchet wheel (10); The anti-overturning grab (7) includes four baffles (7.2), the four baffles (7.2) are fixedly connected on the side walls on the sides away from the two longitudinal beams (1.1) respectively, the baffles (7.2) are rotatably connected with two movable bolts (7.4) between the facing inner side walls close to the lower ends through bearings, the movable bolts (7.4) are fixedly sleeved with a profiled rail claw (7.5) on the upper ends of the baffles (7.2) corresponding to the two profiled rail claws (7.5), two fixed shaft pins (7.3) are arranged on the inner side walls of the upper ends of the baffles (7.2) corresponding to the two profiled rail claws (7.5), the fixed shaft pins (7.3) are respectively clamped with the corresponding profiled rail claws (7.5), one of the profiled rail claws (7.5) is fixedly connected with a piston rod (7.1), the upper end of the piston rod (7.1) penetrates the upper surface of the baffle (7.2) and extends upwards to the outside of the baffle (7.2), and is fixedly connected with the tensioning rope (11); and the anti-overturning grab (7) is made of Q235 steel.

2. The electric catenary maintenance trolley according to claim 1, characterized in that: The ladder car chassis (1) includes two longitudinal beams (1.1), the two longitudinal beams (1.1) are fixedly connected at the lower ends of the detachable ladder frame (2), and the side walls on one side of the two longitudinal beams (1.1) are fixedly connected with a plurality of transverse beams (1.3) together, wherein the two transverse beams (1.3) are fixedly connected with a short longitudinal beam (1.2) together.

3. The electric catenary maintenance trolley according to claim 1, characterized in that: The detachable ladder frame (2) includes a plurality of sub-ladder frames (2.1), wherein four of the sub-ladder frames (2.1) are fixedly connected on the upper surfaces of the two longitudinal beams (1.1) in a matrix shape, the plurality of sub-ladder frames (2.1) are fixedly connected with the two-phase pipe (15), the connection portions between the plurality of sub-ladder frames (2.1) are fixedly connected with a threaded fastener (2.2), every two adjacent sub-ladder frames (2.1) are clamped with the threaded fastener (2.2), and every two corresponding sub-ladder frames (2.1) are fixedly connected with a diagonal pull rod (2.3) on the side walls on one side thereof in an inclined manner, wherein the top ends of the four sub-ladder frames (2.1) are fixedly sleeved with four three-phase pipes (13), and the top ends of the four three-phase pipes (13) are fixedly sleeved at the lower end of the working platform (3).

4. The electric catenary maintenance trolley according to claim 1, characterized in that: The lower surface of the gear reverser (5.3) is fixedly connected with a second bearing seat (5.5), and the second bearing seat (5.5) is fixedly connected at the center of the upper surface of one of the transverse beams (1.3).

5. The electric catenary maintenance trolley according to claim 2, characterized in that: The side walls on the sides away from the two longitudinal beams (1.1) are fixedly connected with four connecting supports (16) in a matrix shape, the upper surfaces of the four connecting supports (16) are fixedly connected with a driven wheel support (19), one end of each of the four driven wheel supports (19) is fixedly connected with a wheel set (6), and two of the driven wheel supports (19) are fixedly connected with two corresponding drive shafts (5.4) respectively.

6. An electric catenary maintenance trolley according to claim 5, characterized in that: Four said driven wheel supports (19) each include a fixed shaft support (19.1), four said fixed shaft supports (19.1) are fixedly connected on the upper surface of four connecting supports (16), the inside of four said fixed shaft supports (19.1) is fixedly sleeved with a bearing (19.3), the inside of four said bearings (19.3) is fixedly sleeved with a fixed shaft (19.2), one end of two said fixed shafts (19.2) is fixedly connected with two corresponding drive shafts (5.4) respectively, the other end of four said fixed shafts (19.2) is fixedly connected with a sleeve (19.4), the end away from the fixed shaft (19.2) of four said sleeves (19.4) is screw-connected with four lock nuts (19.5), four said sleeves (19.4) are fixedly installed with corresponding wheel sets (6) through four lock nuts (19.5) respectively.

7. The electric catenary maintenance trolley according to claim 1, characterized in that: The drive battery pack (4) is fixedly installed on the upper surface of the short longitudinal beam (1.2), the drive battery pack (4) is a lithium battery with parameters and model set as SDA10-4850 / 48V50AH, a DC brush motor is fixedly installed at the output end of the drive battery pack (4), and the output end of the DC brush motor is fixedly connected to one end of the spline shaft (5.1) close to the DC brush motor.

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