CN218021776U

CN218021776U - Portable electric drive boosting vehicle

Info

Publication number: CN218021776U
Application number: CN202221840853.2U
Authority: CN
Inventors: 朱昱康; 雷继平
Original assignee: Zhejiang Brother Guidepost Paint Co ltd
Current assignee: Zhejiang Brother Guidepost Paint Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-12-13
Anticipated expiration: 2032-07-18

Abstract

The utility model discloses a portable electric drive boosting car, it includes the chassis, be equipped with the drum rear axle of stopping on the chassis, the drum rear axle of stopping can be dismantled with the chassis and be connected, drum rear axle both ends of stopping all are equipped with the wheel, the chassis is located between two wheels, the wheel can be dismantled with the drum rear axle of stopping and be connected, drum rear axle side-mounting has the motor, the output and the drum rear axle of stopping of motor can be dismantled and be connected, the drum rear axle of stopping includes the install bin, the motor is connected in the one end of install bin, be equipped with the differential package in the other end of install bin, the output and the differential package of motor are connected, the left and right sides of the install bin other end all is equipped with the bridge pipe, the bridge pipe can be dismantled with the chassis and be connected, the one end and the install bin connection of bridge pipe, the other end of bridge pipe is connected with the drum piece of stopping, be equipped with the pivot in the bridge pipe, pivot rotates with the bridge pipe to be connected, pivot one end is connected with the output of motor through the differential package, the center of drum piece of stopping and wheel can be dismantled to the pivot other end. The beneficial effects of the utility model are that: the air is not easy to be polluted.

Description

Portable electric drive boosting vehicle

Technical Field

The utility model belongs to the technical field of the relevant technique of boosting car and specifically relates to indicate a portable electricity drives boosting car.

Background

The cart aid is a conveying tool which is very convenient to use, and is widely applied to places needing goods shipment, such as factories, workshops, warehouses, dry lands, meadows, playgrounds and the like due to the compact structure.

Chinese patent publication is CN207292050U, and the announcement date of authorizing is 2018 year 05 month 01, discloses a shallow, including the frame, the frame right side is fixed with the propulsion pipe that two slopes set up, and the welding has fastening pipe between two propulsion pipes, frame department is fixed with the direction subassembly, frame right side bottom middle part has still welded the gasoline engine fixing base, gasoline engine fixing base department is fixed with the gasoline engine, the shallow still includes a power component, gasoline engine output shaft end is connected with the separation and reunion band pulley.

It can be known from the above patent that in the prior art, gasoline combustion is mainly used, and although time and labor are saved compared with manual boosting, the gasoline combustion is very easy to pollute air, and the cost is high along with the sharp rise of the gasoline price.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the use of boosting car among the prior art and very easily cause the not enough of pollution to the air, provide a portable electricity that is difficult for causing the pollution to the air and driven boosting car.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a portable electric drive boosting car, it includes the chassis, be equipped with the drum rear axle of stopping on the chassis, the drum rear axle of stopping can be dismantled with the chassis and be connected, the both ends of drum rear axle of stopping all are equipped with the wheel, the chassis is located between two wheels, the wheel can be dismantled with the drum rear axle of stopping and be connected, the side-mounting of drum rear axle has the motor, the output of motor can be dismantled with the drum rear axle of stopping and be connected, the drum rear axle of stopping includes the install bin, the motor is connected in the one end of install bin, be equipped with the differential package in the other end of install bin, the output and the differential package of motor are connected, the left and right sides of the install bin other end all is equipped with the bridge pipe, the bridge pipe can be dismantled with the chassis and be connected, the one end and the install bin connection of bridge pipe, the other end of bridge pipe is connected with the drum piece of stopping, be equipped with the pivot in the bridge pipe, the pivot rotates with the bridge pipe to be connected, the one end of differential pivot is connected with the output of motor through the center of stopping with the wheel can be dismantled.

Be equipped with the drum rear axle of stopping on the chassis, the drum rear axle of stopping can be dismantled with the chassis and be connected, the both ends of drum rear axle of stopping all are equipped with the wheel, the chassis is located between two wheels, the wheel can be dismantled with the drum rear axle of stopping and be connected, the side-mounting of drum rear axle of stopping has the motor, the output of motor can be dismantled with the drum rear axle of stopping and be connected, the drum rear axle of stopping includes the install bin, the motor is connected in the one end of install bin, be equipped with the differential package in the other end of install bin, the output and the differential package of motor are connected, the left and right sides of the install bin other end all is equipped with the bridge pipe, the bridge pipe can be dismantled with the chassis and be connected, the one end and the install bin of bridge pipe are connected, the other end of bridge pipe is connected with the drum piece of stopping, be equipped with the pivot in the bridge pipe, the pivot rotates with the bridge pipe to be connected, the one end of pivot is passed through the differential package and is connected with the output of motor, the other end of pivot can be dismantled through the center of stopping piece and wheel and be connected. The motor drives the wheels to rotate through the drum brake rear axle, and replaces gasoline to burn, so that the aim of preventing air from being polluted easily is fulfilled, the environment is protected, oiling is not needed, and the cost is saved; the motor is connected with one end of the installation box through the shell, so that the motor is favorably fixed, and meanwhile, the motor is positioned in the installation box, so that a certain protection effect on the motor is achieved, and the safety is favorably realized; the motor drives the rotating shafts on the left side and the right side of the mounting box to rotate through the differential belt, and the two wheels are driven to rotate through the rotating shafts at the same time so as to ensure the power transmission of the two wheels under various operating conditions.

Preferably, the drum piece of stopping includes that brake disc and drum stop the pot, one side of brake disc is connected with the other end of bridge pipe, the drum is stopped the pot and is located the corresponding opposite side of brake disc, the center that the other end of pivot runs through the brake disc is stopped the pot with the drum and can be dismantled the connection, one side that the drum was stopped the pot is located the brake disc, the drum is stopped the corresponding opposite side of pot and can be dismantled the connection with the center of wheel. Under the normal driving state, under the drive of motor, when the pivot was stopped the pot through the drum and is driven the wheel rotation, because the brake disc is installed on the bridge pipe, so the pot of stopping of drum produced rotatoryly for the brake disc during needs were stopped the wheel, the driver controlled the inside brake block of brake disc for the brake block produced the friction with the edge of the pot of stopping of drum, thereby reduce the rotational speed of wheel gradually, realize the brake speed reduction of wheel with this, convenient operation, high efficiency is swift.

Preferably, be equipped with the brake axle on the chassis, the brake axle rotates with the chassis to be connected, the brake axle is located the side of drum rear axle of stopping and is parallel to each other with the pivot, the both ends of brake axle all are equipped with brake pull rod assembly, brake pull rod assembly's one end can be dismantled with the brake axle and be connected, brake pull rod assembly's the other end can be dismantled with the brake disc and be connected. The driver controls the brake shaft to rotate by a certain angle so as to drive one end of the brake pull rod assembly to rotate, and the other end of the brake pull rod assembly drives the brake pad in the brake disc to move, so that the brake pad and the edge of the drum brake pot generate friction, and the drum brake pot is convenient to operate, efficient and rapid.

As preferred, brake pull rod subassembly includes shifting block and brake connecting rod, shifting block and brake axle mutually perpendicular, the one end of shifting block can be dismantled with the tip of brake axle and be connected, the other end of shifting block can be dismantled with the one end of brake connecting rod and be connected, the other end of brake connecting rod is equipped with the rocking arm, the one end and the brake connecting rod of rocking arm rotate to be connected, the other end and the brake disc of rocking arm can be dismantled and be connected, the shifting block can be dismantled one of being connected with the brake connecting rod and serve and be equipped with a plurality of mounting hole, and the length direction of shifting block is followed to a plurality of mounting hole distributes, be equipped with the bolt that matches with the mounting hole on the brake connecting rod, the brake connecting rod passes through bolt and one of them mounting hole matches mutually and can dismantle with the shifting block and be connected. The mounting holes are convenient for a driver to adjust the tightness of the brake according to actual requirements, and the practicability is improved.

Preferably, two installation blocks are arranged on the underframe and are respectively positioned on the left side and the right side of the differential bag, one side of each installation block is connected with the underframe, a U-shaped rod is arranged on the other side corresponding to the installation blocks, the open end of each U-shaped rod is detachably connected with the installation blocks and forms a positioning opening matched with the corresponding bridge pipe, and the bridge pipe is detachably installed in the corresponding positioning opening. The bridge pipe is detachably connected to the mounting block through the U-shaped rod and then is fixed by screwing the bolt, so that the bridge pipe is simple in structure and convenient to assemble.

Preferably, the bridge pipe includes protection tube one and protection tube two, the one end of protection tube one can be dismantled with the side of install bin and be connected or fixed connection, form the clearance between the other end of protection tube one and the one end of protection tube two, the other end of protection tube two is stopped the piece with the drum and is connected, protection tube one can be dismantled with the chassis and be connected, protection tube two and chassis horizontal sliding connection, the pivot is extending structure, the both ends of pivot are located protection tube one respectively and protection tube two is interior. The second protection tube is connected with the underframe in a left-right sliding mode, and the rotating shaft stretches synchronously, so that the wheel distance between the two wheels can be changed while the wheels rotate, and different actual requirements can be met; for example, in general, when the goods are stacked too high, the vehicle body is easy to roll over, and the stability of the vehicle body can be improved by increasing the wheel track; meanwhile, when the vehicle body needs to pass through a narrow distance, the distance between the two wheels can be shortened by reducing the wheel track, so that the passing property is favorably improved; a gap is formed between the other end of the first protection tube and one end of the second protection tube, so that an operation space is provided for the expansion of the rotating shaft and the left-right sliding of the second protection tube and the underframe.

Preferably, the pivot includes the spline housing and rather than assorted integral key shaft, the spline housing is located protection tube one, the integral key shaft is located protection tube two, the one end of spline housing is passed through the differential package and is connected with the output of motor, the other end of spline housing and the one end side-to-side sliding connection of integral key shaft, the other end of integral key shaft is stopped a piece and can be dismantled with the center of wheel through the drum and be connected. The spline sleeve and the spline shaft are matched to form the rotating shaft, so that power transmission is facilitated, free extension and retraction of the rotating shaft can be realized, and the change of the wheel track is facilitated.

Preferably, the underframe is provided with two supporting blocks which are respectively in one-to-one correspondence with the two protection tubes on the left side and the right side of the installation box, one side of each supporting block is fixedly connected with the underframe, the other side corresponding to the supporting block is provided with a dovetail chute, the two protection tubes on the left side and the right side of the installation box are respectively fixed with a sliding block which is matched with the dovetail chutes on the corresponding supporting block one by one, and the two protection tubes are connected to the underframe in a left-and-right sliding mode through the sliding blocks in a matching way with the corresponding dovetail chutes. The slide block is matched with the dovetail sliding groove, so that the bearing capacity is improved favorably when the second protection tube drives the wheels to slide left and right to adjust the wheel track.

As preferred, be equipped with on the chassis and control rotatory lead screw motor, a left side dextrorotation lead screw motor is located the side of differential package, it is connected to control rotatory lead screw motor and can dismantle with the center of chassis, be equipped with levogyration lead screw and dextrorotation lead screw on the dextrorotation lead screw motor of a left side respectively, levogyration lead screw and dextrorotation lead screw all are parallel to each other with the pivot, all be fixed with the connecting block on two protection tubes of the install bin left and right sides, levogyration lead screw motor can dismantle through levogyration lead screw and the connecting block on two protection tubes in install bin left side and be connected, levogyration lead screw motor can dismantle through dextrorotation lead screw and the connecting block on two protection tubes in install bin right side protection tubes and be connected. The same principle that the steering wheel is easier to rotate during the running process of the automobile than when the automobile stops is adopted, and in order to facilitate the adjustment of the wheel track, the adjustment of the wheel track is preferably performed during the running process of the boosting vehicle; when the wheel track needs to be changed, a driver controls the left-handed screw rod motor and the right-handed screw rod motor to simultaneously drive the left-handed screw rod and the right-handed screw rod to rotate, so that the wheel track between the two wheels can be synchronously increased or reduced, the gravity center of the push-aid cart is kept unchanged, and safe driving is facilitated.

The utility model has the advantages that: the purpose of not easily causing pollution to air is achieved, environmental protection is facilitated, oiling is not needed, and cost is saved; the motor is positioned in the installation box, plays a certain role in protecting the motor and is beneficial to safety; the operation is convenient, efficient and quick; the driver can adjust the tightness of the brake according to the actual demand, which is beneficial to improving the practicability; the structure is simple, and the assembly is convenient; the wheel track between the two wheels can be changed while the wheels rotate, so that different actual requirements can be met, and the stability and the trafficability of the vehicle body can be improved; the slide block is matched with the dovetail sliding groove, so that the wheel track is adjusted by driving the wheels to slide left and right through the second protection tube, and the bearing capacity is improved; the wheel track between the two wheels can be synchronously increased or reduced, so that the gravity center of the boosting cart is kept unchanged, and safe driving is facilitated.

Drawings

Fig. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a bottom view of FIG. 2;

FIG. 4 is a second schematic structural view of the present invention;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a top view of FIG. 6;

fig. 8 is a sectional view of B-B in fig. 7.

In the figure: 1. the brake device comprises a base frame, 2 parts of a drum brake rear axle, 3 parts of wheels, 4 parts of motors, 5 parts of an installation box, 6 parts of a differential package, 7 parts of an axle tube, 8 parts of a drum brake piece, 9 parts of a rotating shaft, 10 parts of a brake disc, 11 parts of a drum brake pot, 12 parts of a brake shaft, 13 parts of a brake pull rod assembly, 14 parts of a shifting block, 15 parts of a brake connecting rod, 16 parts of a rocker arm, 17 parts of an installation hole, 18 parts of a bolt, 19 parts of an installation block, 20 parts of a U-shaped rod, 21 parts of a positioning hole, 22 parts of a protection tube I, 23 parts of a protection tube II, 24 parts of a gap, 25 parts of a spline sleeve, 26 parts of a spline shaft, 27 parts of a support block, 28 parts of a dovetail chute, 29 parts of a sliding block, 30 parts of left and right rotary screw rod motors, 31 parts of left rotary screw rods, 32 parts of right rotary screw rods and 33 parts of connecting blocks.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment as shown in fig. 1, fig. 2, fig. 3 and fig. 4, a portable electric drive boosting vehicle comprises a chassis 1, a drum brake rear axle 2 is arranged on the chassis 1, the drum brake rear axle 2 is detachably connected with the chassis 1, wheels 3 are arranged at two ends of the drum brake rear axle 2, the chassis 1 is located between the two wheels 3, the wheels 3 are detachably connected with the drum brake rear axle 2, a motor 4 is arranged on the side surface of the drum brake rear axle 2, the output end of the motor 4 is detachably connected with the drum brake rear axle 2, the drum brake rear axle 2 comprises an installation box 5, the motor 4 is connected in one end of the installation box 5, a differential bag 6 is arranged in the other end of the installation box 5, the output end of the motor 4 is connected with the differential bag 6, bridge pipes 7 are arranged on the left and right sides of the other end of the installation box 5, the bridge pipes 7 are detachably connected with the chassis 1, one end of the bridge pipes 7 is connected with the installation box 5, the other end of the bridge pipes 7 is connected with a drum brake piece 8, a rotating shaft 9 is arranged in the bridge pipe 7, the rotating shaft is rotatably connected with the other end of the motor 4 through the center of the wheel brake piece 8.

As shown in fig. 1, the drum brake piece 8 includes a brake disc 10 and a drum brake pot 11, one side of the brake disc 10 is connected with the other end of the bridge tube 7, the drum brake pot 11 is located at the other side corresponding to the brake disc 10, the other end of the rotating shaft 9 penetrates through the center of the brake disc 10 and is detachably connected with the drum brake pot 11, one side of the drum brake pot 11 is located in the brake disc 10, and the other side corresponding to the drum brake pot 11 is detachably connected with the center of the wheel 3.

As shown in fig. 1, 2 and 3, a brake shaft 12 is arranged on the chassis 1, the brake shaft 12 is rotatably connected with the chassis 1, the brake shaft 12 is located on the side surface of the drum brake rear axle 2 and is parallel to the rotating shaft 9, two ends of the brake shaft 12 are respectively provided with a brake pull rod assembly 13, one end of each brake pull rod assembly 13 is detachably connected with the brake shaft 12, and the other end of each brake pull rod assembly 13 is detachably connected with the brake disc 10.

As shown in fig. 1, 2 and 3, the brake pull rod assembly 13 includes a shifting block 14 and a brake connecting rod 15, the shifting block 14 is perpendicular to the brake shaft 12, one end of the shifting block 14 is detachably connected to an end of the brake shaft 12, the other end of the shifting block 14 is detachably connected to one end of the brake connecting rod 15, the other end of the brake connecting rod 15 is provided with a rocker arm 16, one end of the rocker arm 16 is rotatably connected to the brake connecting rod 15, the other end of the rocker arm 16 is detachably connected to the brake disc 10, one end of the shifting block 14 detachably connected to the brake connecting rod 15 is provided with a plurality of mounting holes 17, the plurality of mounting holes 17 are distributed along the length direction of the shifting block 14, the brake connecting rod 15 is provided with bolts 18 matched with the mounting holes 17, and the brake connecting rod 15 is detachably connected to the shifting block 14 through the bolts 18 and one of the mounting holes 17.

As shown in fig. 1, 2, 3 and 4, two mounting blocks 19 are arranged on the chassis 1, the two mounting blocks 19 are respectively located at the left side and the right side of the differential package 6, one side of the mounting block 19 is connected with the chassis 1, the other side corresponding to the mounting block 19 is provided with a U-shaped rod 20, the open end of the U-shaped rod 20 is detachably connected with the mounting block 19 and forms a positioning opening 21 matched with the corresponding bridge pipe 7, and the bridge pipe 7 is detachably mounted in the corresponding positioning opening 21.

As shown in fig. 4, 5 and 7, the bridge pipe 7 includes a first protection pipe 22 and a second protection pipe 23, one end of the first protection pipe 22 is detachably connected or fixedly connected with the side surface of the installation box 5, a gap 24 is formed between the other end of the first protection pipe 22 and one end of the second protection pipe 23, the other end of the second protection pipe 23 is connected with the drum brake 8, the first protection pipe 22 is detachably connected with the underframe 1, the second protection pipe 23 is connected with the underframe 1 in a left-right sliding manner, the rotating shaft 9 is of a telescopic structure, and two ends of the rotating shaft 9 are respectively located in the first protection pipe 22 and the second protection pipe 23.

As shown in fig. 4, 5 and 7, the rotating shaft 9 includes a spline housing 25 and a spline shaft 26 matched with the spline housing 25, the spline housing 25 is located in the first protection tube 22, the spline shaft 26 is located in the second protection tube 23, one end of the spline housing 25 is connected with the output end of the motor 4 through the differential case 6, the other end of the spline housing 25 is connected with one end of the spline shaft 26 in a left-right sliding manner, and the other end of the spline shaft 26 is detachably connected with the center of the wheel 3 through the drum brake 8.

As shown in fig. 4, 5, 6, 7 and 8, two supporting blocks 27 corresponding to the two protection tubes 23 on the left and right sides of the installation box 5 one by one are arranged on the chassis 1, one side of each supporting block 27 is fixedly connected with the chassis 1, the other side corresponding to the supporting block 27 is provided with a dovetail sliding groove 28, the two protection tubes 23 on the left and right sides of the installation box 5 are both fixed with sliding blocks 29 matched with the dovetail sliding grooves 28 on the corresponding supporting blocks 27 one by one, and the two protection tubes 23 are connected to the chassis 1 in a sliding manner from left to right through the sliding blocks 29 and the corresponding dovetail sliding grooves 28.

As shown in fig. 4, 5, 6 and 7, a left-right rotating screw rod 32 motor 30 is arranged on the chassis 1, the left-right rotating screw rod 32 motor 30 is positioned on the side surface of the differential package 6, the left-right rotating screw rod 32 motor 30 is detachably connected with the center of the chassis 1, a left-right rotating screw rod 31 and a right-right rotating screw rod 32 are respectively arranged on the left-right rotating screw rod 32 motor 30, the left-right rotating screw rod 31 and the right-right rotating screw rod 32 are both parallel to the rotating shaft 9, connecting blocks 33 are fixed on the two protection pipes 23 on the left side and the right side of the installation box 5, the left-right rotating screw rod 32 motor 30 is detachably connected with the connecting blocks 33 on the two protection pipes 23 on the left side of the installation box 5 through the left-right rotating screw rod 31, and the left-right rotating screw rod 32 motor 30 is detachably connected with the connecting blocks 33 on the two protection pipes 23 on the right side of the installation box 5 through the right-right rotating screw rod 32.

Under the normal driving state, under the drive of motor 4, when pivot 9 drives wheel 3 rotation through drum pot 11 of stopping, because brake disc 10 installs on bridge tube 7, so drum pot 11 of stopping produces rotatoryly for brake disc 10 at this time, when needs are stopped to wheel 3, the driver controls the rotatory certain angle of brake axle 12, it is rotatory to drive the one end of brake pull rod subassembly 13, and the other end through brake pull rod subassembly 13 drives the brake block action in the brake disc 10, make the brake block produce the friction with the edge of drum pot 11 of stopping, thereby reduce the rotational speed of wheel 3 gradually, thereby realize the brake speed reduction of wheel 3, and convenient for operation, high efficiency is swift.

Under the normal condition, when goods are stacked too high, the vehicle body is easy to turn over, and the stability of the vehicle body can be improved by increasing the wheel track; meanwhile, when the vehicle body needs to pass through at a narrow distance, the distance between the two wheels 3 can be shortened by reducing the wheel track, and the passing performance is favorably improved. Based on this, the bridge tube 7 is further changed and designed into a structure formed by the first protection tube 22 and the second protection tube 23, the second protection tube 23 is connected to the underframe 1 in a left-right sliding mode through the sliding block 29 and the dovetail sliding groove 28 in a matched mode, meanwhile, the rotating shaft 9 is changed and designed into a structure formed by the spline sleeve 25 and the spline shaft 26 in a matched mode, power transmission is facilitated, and free stretching and retracting of the rotating shaft 9 can be achieved. In order to facilitate the adjustment of the track width, it is generally preferable that the adjustment of the track width is performed during the traveling of the booster vehicle, in the same principle that it is easier to turn the steering wheel during the traveling of the vehicle than when the vehicle is stopped.

Claims

1. The utility model provides a portable electric drive boosting car, characterized by, includes chassis (1), be equipped with drum rear axle (2) of stopping on chassis (1), drum rear axle (2) of stopping can be dismantled with chassis (1) and be connected, the both ends of drum rear axle (2) of stopping all are equipped with wheel (3), chassis (1) are located between two wheel (3), wheel (3) can be dismantled with drum rear axle (2) of stopping and be connected, the side-mounting of drum rear axle (2) has motor (4), the output of motor (4) can be dismantled with drum rear axle (2) and be connected, drum rear axle (2) of stopping includes install bin (5), motor (4) are connected in the one end of install bin (5), be equipped with differential package (6) in the other end of install bin (5), the output and the differential package (6) of motor (4) are connected, the left and right sides of the install bin (5) other end all is equipped with bridge tube (7), bridge tube (7) can be dismantled with the one end of chassis (1) and be connected with the pivot (7), the other end of stopping is connected with axle tube (9), pivot (7) and rotation shaft (9), the one end of pivot (9) is passed through differential package (6) and is connected with the output of motor (4), the other end of pivot (9) is stopped piece (8) through the drum and can be dismantled with the center of wheel (3) and be connected.

2. The portable electric drive boosting vehicle as claimed in claim 1, wherein the drum brake member (8) comprises a brake disc (10) and a drum brake pot (11), one side of the brake disc (10) is connected with the other end of the bridge tube (7), the drum brake pot (11) is located on the other side corresponding to the brake disc (10), the other end of the rotating shaft (9) penetrates through the center of the brake disc (10) to be detachably connected with the drum brake pot (11), one side of the drum brake pot (11) is located in the brake disc (10), and the other side corresponding to the drum brake pot (11) is detachably connected with the center of the wheel (3).

3. The portable electric-drive boosting vehicle as claimed in claim 2, wherein a brake shaft (12) is arranged on the chassis (1), the brake shaft (12) is rotatably connected with the chassis (1), the brake shaft (12) is arranged on the side surface of the drum brake rear axle (2) and is parallel to the rotating shaft (9), brake pull rod assemblies (13) are arranged at two ends of the brake shaft (12), one end of each brake pull rod assembly (13) is detachably connected with the brake shaft (12), and the other end of each brake pull rod assembly (13) is detachably connected with the brake disc (10).

4. A portable electric drive assist cart according to claim 3, wherein said brake lever assembly (13) comprises a shift block (14) and a brake link (15), said shift block (14) is perpendicular to said brake shaft (12), one end of said shift block (14) is detachably connected to the end of said brake shaft (12), the other end of said shift block (14) is detachably connected to one end of said brake link (15), said other end of said brake link (15) is provided with a rocker arm (16), one end of said rocker arm (16) is rotatably connected to said brake link (15), the other end of said rocker arm (16) is detachably connected to said brake disc (10), one end of said shift block (14) detachably connected to said brake link (15) is provided with a plurality of mounting holes (17), said plurality of mounting holes (17) are distributed along the length direction of said shift block (14), said brake link (15) is provided with a bolt (18) matching said mounting holes (17), said brake link (15) is detachably connected to said shift block (14) through said bolt (18) and one of said mounting holes (17).

5. The portable electric-driven boosting vehicle as claimed in claim 1, wherein two mounting blocks (19) are provided on the chassis (1), the two mounting blocks (19) are respectively located at the left and right sides of the differential bag (6), one side of the mounting block (19) is connected with the chassis (1), a U-shaped rod (20) is provided at the other side corresponding to the mounting block (19), the open end of the U-shaped rod (20) is detachably connected with the mounting block (19) and forms a positioning opening (21) matched with the corresponding bridge pipe (7), and the bridge pipe (7) is detachably mounted in the corresponding positioning opening (21).

6. A portable electric drive assist cart according to claim 1 or 2 or 3 or 4 or 5, wherein the bridge tube (7) comprises a first protection tube (22) and a second protection tube (23), one end of the first protection tube (22) is detachably or fixedly connected with the side surface of the mounting box (5), a gap (24) is formed between the other end of the first protection tube (22) and one end of the second protection tube (23), the other end of the second protection tube (23) is connected with the drum brake member (8), the first protection tube (22) is detachably connected with the chassis (1), the second protection tube (23) is connected with the chassis (1) in a left-right sliding manner, the rotating shaft (9) is of a telescopic structure, and the two ends of the rotating shaft (9) are respectively located in the first protection tube (22) and in the second protection tube (23).

7. A portable electric drive boosting vehicle according to claim 6, wherein the rotating shaft (9) comprises a spline housing (25) and a spline shaft (26) matched with the spline housing, the spline housing (25) is positioned in a first protection tube (22), the spline shaft (26) is positioned in a second protection tube (23), one end of the spline housing (25) is connected with the output end of the motor (4) through a differential speed bag (6), the other end of the spline housing (25) is connected with one end of the spline shaft (26) in a left-right sliding manner, and the other end of the spline shaft (26) is detachably connected with the center of the wheel (3) through a drum brake (8).

8. The portable electric drive boosting vehicle as claimed in claim 6, wherein two supporting blocks (27) corresponding to the two protection tubes (23) on the left side and the right side of the installation box (5) one by one are arranged on the chassis (1), one side of each supporting block (27) is fixedly connected with the chassis (1), dovetail sliding grooves (28) are formed in the other side corresponding to the supporting blocks (27), sliding blocks (29) matched with the dovetail sliding grooves (28) on the corresponding supporting blocks (27) one by one are fixed on the two protection tubes (23) on the left side and the right side of the installation box (5), and the two protection tubes (23) are connected to the chassis (1) in a sliding mode in a left-right mode through the sliding blocks (29) and the corresponding dovetail sliding grooves (28) in a matching mode.

9. The portable electric drive boosting vehicle as claimed in claim 6, wherein a left right-handed screw motor (30) is arranged on the chassis (1), the left right-handed screw motor (30) is positioned on the side of the differential package (6), the left right-handed screw motor (30) is detachably connected with the center of the chassis (1), a left-handed screw (31) and a right-handed screw (32) are respectively arranged on the left right-handed screw motor (30), the left-handed screw (31) and the right-handed screw (32) are parallel to each other with the rotating shaft (9), a connecting block (33) is fixed on the two protection tubes (23) on the left and right sides of the installation box (5), the left right-handed screw motor (30) is detachably connected with the connecting block (33) on the two protection tubes (23) on the left side of the installation box (5) through the left-handed screw (31), and the left-handed screw motor (30) is detachably connected with the connecting block (33) on the two protection tubes (23) on the right side of the installation box (5) through the right-handed screw (32).