Electric handcart

1. An electric handcart, comprising: a main body, a power supply device mounted on the main body, a motive power device and a control device, the power supply device and the control device being separately connected to the motive power device

wherein the main body comprises a frame on which the power supply device, the motive power device and the control device are mounted, and multiple wheels which carry the frame,

wherein the motive power device comprises a driving device, a transmission device connected to the driving device, a clutch device connected to the transmission device, and a braking device; the wheels are separately connected to the transmission device and the braking device, and the control device is separately connected to the driving device and the braking device, and

wherein the braking device comprises a brake/clutch motor, a cam, a brake line, a braking part, and a brake disk which acts on at least one of the wheels; an output shaft of the brake/clutch motor is connected to the cam, the cam is connected to the braking part via the brake line, and the clutch device is connected to the cam.

2. The electric handcart as claimed in claim 1 , wherein the clutch device comprises a clutch control rod, a clutch driving lever and a clutch body; one end of the clutch control rod is connected to the cam , the other end of the clutch control rod is connected to one end of the clutch driving lever, the other end of the clutch driving lever is connected to the clutch body, and the clutch body is connected to the transmission device.

3. The electric handcart as claimed in claim 1 , wherein the transmission device is a differential transmission device.

4. The electric handcart as claimed in claim 3 , wherein the differential transmission device comprises a first-stage transmission gear connected to a drive motor in the driving device, a second-stage transmission gear meshed with the first-stage transmission gear, a first rotation shaft with the second-stage transmission gear mounted on one end thereof, a second rotation shaft with one end connected to the other end of the first rotation shaft via the clutch device, a third-stage transmission gear mounted on the other end of the second rotation shaft, a fourth-stage transmission gear meshed with the third-stage transmission gear, and a drive shaft on which the fourth-stage transmission gear is mounted; wherein the wheels are mounted on two ends of the drive shaft respectively.

5. The electric handcart as claimed in claim 4 , wherein the transmission ratio of the differential transmission device is 1:3.

6. The electric handcart as claimed in claim 3 , wherein the transmission ratio of the differential transmission device is 1:3.

7. The electric handcart as claimed in claim 1 , wherein the power supply device comprises an upper housing and a lower housing; the lower housing is mounted on the main body in a fixed manner, and the upper housing is detachably connected to the lower housing.

8. The electric handcart as claimed in claim 7 , wherein a sealing ring is provided between the lower housing and the upper housing.

9. The electric handcart as claimed in claim 1 , wherein the control device comprises a controller for controlling the motive power device, and a switch device connected to the controller.

10. The electric handcart as claimed in claim 9 , wherein the switch device comprises: a power supply membrane switch for controlling the switching of a power supply of the electric handcart on or off, a brake switch, a motor adjustment switch for adjusting motor operation when the power supply is switched on, a direction adjustment membrane switch for controlling the advance or retreat of the electric handcart, and a speed adjustment membrane switch for adjusting the movement speed of the electric handcart.

11. The electric handcart as claimed in claim 10 , wherein a handle is provided on the main body, and the switch device is arranged on the handle.

12. The electric handcart as claimed in claim 11 , wherein the power supply membrane switch is arranged on an end face of a first end of the handle, the brake switch is arranged on an inner side of the first end, the motor adjustment switch is arranged on an inner side of a second end of the handle, and the direction adjustment membrane switch and the speed adjustment membrane switch are arranged on an end face of the second end.

13. The electric handcart as claimed in claim 1 , wherein the electric handcart can switch between three operating modes, the three operating modes comprising a freewheel mode, an electrically powered mode, and a braking mode.

14. The electric handcart as claimed in claim 1 , wherein the electric handcart is alternatable between a folded state and an extended state.

15. An electric handcart, comprising:

a main body, a power supply device mounted on the main body, a motive power device and a control device, wherein the main body comprises a frame on which the power supply device, the motive power device and the control device are mounted, and multiple wheels which carry the frame,

wherein the motive power device comprises a driving device and a braking device, and the power supply device is separately connected to the driving device and the braking device, and

wherein the power supply device supplies electrical energy to the driving device and the braking device.

16. The electric handcart as claimed in claim 15 , wherein the control device comprises a controller and a switch device connected to the controller, and wherein the driving device and the braking device can be activated by the switch device and the controller.

17. The electric handcart as claimed in claim 15 , wherein the electric handcart can switch between three operating modes, the three operating modes comprising a freewheel mode, an electrically powered mode, and a braking mode.

18. The electric handcart as claimed in claim 15 , wherein the electric handcart is alternatable between a folded state and an extended state.

19. The electric handcart as claimed in claim 15 , wherein the braking device comprises a brake/clutch motor, a cam, a brake line, a braking part, and a brake disk which acts on at least one of the wheels; an output shaft of the brake/clutch motor is connected to the cam, the cam is connected to the braking part via the brake line, and the clutch device is connected to the cam.