TWI515134B - Wheelbarrow with height adjustable tray - Google Patents

Description

Trolley with lifting tray

The present invention relates to a cart, and more particularly to a cart having a lift tray.

In the field of mechanical product manufacturing, it is often necessary to transport heavy workpieces and place them on cabinets with a certain height, such as molds. Due to the heavy weight of the workpiece, it is inconvenient for the worker to manually carry the workpiece to the cabinet. The prior art mainly uses a forklift to carry the workpiece. However, the use of a forklift requires a high level of skill for the worker, which is prone to errors and damage to the workpiece. And the size of the forklift is so large that it cannot be used in many situations.

In view of this, it is necessary to provide a trolley for the worker to place the workpiece in a cabinet having a certain height.

The invention provides a trolley with a lifting tray, the trolley comprises a support frame and a tray, the bottom of the support frame is fixed with a caster for placing or carrying a workpiece, the tray is slidably disposed on the support frame, the trolley A drive mechanism and a transmission mechanism are also provided for transmitting movement of the drive mechanism to drive the tray to slide relative to the support frame.

By using the trolley to carry the workpiece, the above problems can be effectively solved, and thus it is convenient for the worker to use.

1‧‧‧Trolley

10‧‧‧Support frame

11‧‧‧ top

12‧‧‧ bottom

13‧‧‧ Vertical rod

14‧‧‧ Positioning rod

15‧‧‧ fixed pulley

16‧‧‧ casters

17‧‧‧Chute

18‧‧‧Pushing rod

20‧‧‧Tray

21‧‧‧ first link

22‧‧‧second connecting rod

23‧‧‧ Third Link

24‧‧‧fourth link

25‧‧‧ horizontal board

26‧‧‧Support rod

27‧‧‧Baffle

28‧‧‧ Bearing

29‧‧‧ Positioning block

30‧‧‧Drive mechanism

31‧‧‧Electric motor

311‧‧‧ Subject

312‧‧‧First pulley

313‧‧‧handle

314‧‧‧Control switch

32‧‧‧Inverter

40‧‧‧Transmission mechanism

41‧‧‧ screw

411‧‧‧ Rod

412‧‧‧Second pulley

413‧‧‧wheels

42‧‧‧ lifting plate

421‧‧‧ bushing

423‧‧‧ nuts

43‧‧‧Connecting rope

1 is a perspective view of a cart having a lift tray in accordance with a preferred embodiment of the present invention.

Figure 2 is a perspective view of another opposite perspective view of the cart of Figure 1.

Figure 3 is a perspective view of the trolley support frame of Figure 1.

Figure 4 is a perspective view of the trolley tray of Figure 1.

Figure 5 is a perspective view of the trolley screw of Figure 1.

Referring to FIG. 1 and FIG. 2 together, the trolley 1 includes a support frame 10, a tray 20, a driving mechanism 30 and a transmission mechanism 40. The tray 20 is slidably disposed on the support frame 10 for placing a workpiece. The driving mechanism 30 and the transmission mechanism 40 are respectively used for driving and positioning the tray 20, thereby conveniently placing the workpiece on the cabinet having a certain height.

Referring to FIG. 3, the support frame 10 includes a top portion 11, a bottom portion 12, and four vertical rods 13 and two positioning rods 14 therebetween. Two fixed pulleys 15 are arranged side by side on the two sides of the top portion 11, and four casters 16 are arranged on the bottom portion 12. The four vertical rods 13 and the two positioning rods 14 are parallel to each other and form a square receiving space. The four vertical rods 13 are oppositely opened with a sliding groove 17 extending along the longitudinal direction thereof. The support frame 10 further includes a push rod 18 fixed to the vertical rod 13 for facilitating the user to push the support frame 10 to slide.

Referring to FIG. 4, the tray 20 has a rectangular plate shape, and the tray 20 is composed of a first link 21, a second link 22, a third link 23, and a fourth link 24 which are fixedly connected in sequence. The first link 21 is parallel to the third link 23, and the second link 22 is parallel to the fourth link 24. A horizontal plate 25 and a plurality of supports are further disposed between the first link 21 and the third link 23 Rod 26. The support rod 26 is used to support or place the workpiece. The first link 21, the second link 22, and the third link 23 are provided with a convex baffle 27 for preventing the workpiece from slipping out of the tray 20. The tray 20 is slidably disposed between the four vertical rods 13 described above, and the chutes 17 of each of the vertical rods 13 are provided with two side-by-side bearings 28. The two bearings 28 are snapped into the above-described chute 17, so that the tray 20 can smoothly slide along the chute 17. A positioning block 29 is detachably fixed to an end of the first link 21 and the third link 23 adjacent to the second link 24, and the positioning block 29 is substantially L-shaped. As shown in the figure, the positioning block 29 on the right side can prevent the workpiece from slipping out of the fourth link 24, and the positioning block 29 on the left side cannot prevent the workpiece from slipping out from the fourth link 24.

1 and 2, the drive mechanism 30 includes a motor 31 and a frequency converter 32 that are fixed to the support frame 10. The motor 31 includes a main body 311, a first pulley 312, a control switch 314, and a handle 313. The handle 313 can control the rotation of the first pulley 312 for manual trimming and power failure. The control switch 314 is used to control the rotational output of the first pulley 312 on the motor 31, including its direction of rotation, torque and rotational speed. The frequency converter 32 is coupled to the motor 31 for effecting variable speed rotation of the motor 31.

Referring to FIG. 5 together, the transmission mechanism 40 includes a screw 41, a lifting plate 42 and two connecting wires 43. The screw 41 includes a rod portion 411 and a second pulley 412 that are fixed to each other. The second pulley 412 is rotatably coupled to the first pulley 312 by a belt 413. In the present embodiment, the radius of the second pulley 412 is larger than the radius of the first pulley 312. The lifting plate 42 includes a sleeve 421 for the two positioning rods 14 of the support frame 10 to pass therethrough. The lifting plate 42 further includes a nut 423 embedded therein for the screw 41 to pass therethrough. The screw 41 and the nut 423 constitute a ball screw. group. Thereby, the lift plate 42 can slide along the positioning rod 14 and the screw 41 when the screw 41 rotates. One end of the connecting cord 43 is fixed to The other end of the horizontal plate 25 of the tray 20 is passed around the two fixed pulleys 15 and fixed to the lifting plate 42.

After the assembly is completed, the tray 20 is located between the four vertical rods 13 of the above-described support frame 10. When the motor 31 is operated to drive the screw 41 to rotate, the lifting plate 42 can slide along the two positioning rods 14 and the screw 41, thereby driving the tray 20 to move up and down. Thus, the cart 1 can facilitate the worker to place the workpiece on a cabinet having a certain height.

1‧‧‧Trolley

10‧‧‧Support frame

11‧‧‧ top

13‧‧‧ Vertical rod

14‧‧‧ Positioning rod

15‧‧‧ fixed pulley

17‧‧‧Chute

20‧‧‧Tray

30‧‧‧Drive mechanism

31‧‧‧Electric motor

32‧‧‧Inverter

40‧‧‧Transmission mechanism

41‧‧‧ screw

42‧‧‧ lifting plate

43‧‧‧Connecting rope

Claims (9)

A trolley with a lifting tray, the trolley comprising a support frame and a tray, the bottom of the support frame is fixed with a caster for placing or carrying a workpiece, the improvement is that the tray is slidably disposed on the support frame, Two fixed pulleys are arranged side by side on the top sides of the support frame, and the trolley further includes a driving mechanism and a transmission mechanism for transmitting the movement of the driving mechanism to drive the tray to slide relative to the support frame. The driving mechanism includes an electric motor, the electric motor includes a main body, and the transmission mechanism includes a screw, a lifting plate and two connecting ropes. The screw is connected to the electric motor and can be rotated by the electric motor. When the screw rotates, The lifting plate can slide along the screw, the connecting rope is fixed at one end to the horizontal plate, and the other end is fixed to the lifting plate after bypassing the two fixed pulleys. The handcart according to claim 1, wherein: the support frame comprises a top portion, a bottom portion and four vertical rods between the top portion and the bottom portion, and the tray slidably sets the four vertical rods between. The trolley of claim 2, wherein: the bracket is composed of a first link, a second link, a third link and a fourth link which are fixedly connected in sequence, the first link and the first link A plurality of parallel support rods are rotatably coupled between the third links. The trolley of claim 3, wherein: the vertical rods are oppositely disposed with sliding slots extending along the length of the vertical rod, and the trays are correspondingly provided with bearings that are snapped into the sliding slots. The trolley of claim 3, wherein: the first link and the third link are respectively detachably fixed with an L-shaped positioning block near the end of the second link, and the positioning block is used for blocking The workpiece slides out of the fourth link. The trolley of claim 1, wherein: the drive mechanism further comprises a frequency converter The frequency converter is used to realize the variable speed rotation of the motor. The handcart according to claim 1, wherein the motor comprises a first pulley, the screw comprises a second pulley and a wheel, and the second pulley is rotatably coupled to the first pulley by the belt . The trolley of claim 7, wherein the motor further comprises a control switch for controlling a rotational output of the first pulley on the motor, including a first pulley rotation direction, a torque and a rotation speed. . The handcart according to claim 7, wherein the motor further comprises a handle capable of controlling the rotation of the first pulley for manual fine adjustment of the motor and use in the event of power failure.