Electric lifting forklift portal frame with counter weight

Abstract

The invention relates to the technical field of forklifts, and particularly discloses an electric lifting forklift gantry with a counterweight, which comprises a forklift body and a fork head, and an electric driving unit is mounted on the forklift body; an outer door frame is fixedly mounted on the vehicle body, an inner door frame can roll up and down through a roller and a first roller path in the outer door frame, and a fork head can roll up and down through a roller and a second roller path of the inner door frame; and the electric driving unit is connected with the lifting unit. The movable balance weight is arranged in the lifting device, when the inner portal and the fork head ascend, the movable balance weight descends, the potential energy of the high position of the movable balance weight is converted into the kinetic energy of lifting of the fork head and finally converted into the potential energy of the fork head at the high position, electric energy output of the motor is reduced, energy is saved, and the energy needed by ascending of the movable balance weight comes from descending of the fork head; extra energy input is avoided, energy input is reduced, and meanwhile, the output power needed in the process that the motor drives the fork head to move upwards is correspondingly reduced due to the arrangement of the movable balance weight.

Description

Technical Field

[0001] The invention belongs to the technical field of forklifts, and in particular relates to a mast of an electric lifting forklift with a counterweight. Background Art

[0002] With the development of the logistics industry, forklifts have become more diversified, and various types of forklifts have emerged one after another. However, fundamentally, forklifts with high-position lifting still use hydraulic systems as lifting power systems and hydraulic cylinders as lifting actuators.

[0003] In the Chinese patented wire rope semi-free lifting and motor-driven tilting forklift mast system with announcement number CN105110254A, there is disclosed a cargo fork 1, a fork frame 2, a fork frame roller 3, an outer mast 4, an inner mast 11, a lower hinge seat 12, a mast roller 15 and a side roller 19, wherein the cargo fork and the fork frame roller are installed on the fork frame, the fork frame roller is placed in the C-shaped slideway of the inner mast, the mast roller is installed on the outer mast and placed in the L-shaped slideway of the inner mast; the side roller is located in the roller shaft of the inner mast, and the mast is bolted to the lower hinge seat.

[0004] The above device has the following problems during use:

[0005] When the above device is in use, the power for the fork and the goods on it to rise is completely provided by the motor. During the lifting process of the goods, the electricity cost required is relatively high. Therefore, the present application proposes an electric lifting forklift mast with a counterweight, in which a movable counterweight is arranged inside. When the inner mast and forkhead rise, the movable counterweight descends, and the potential energy of the movable counterweight at a high position is converted into kinetic energy for the lifting of the forkhead and finally into the potential energy of the forkhead at a high position, reducing the electric energy output of the motor and saving energy. The energy required for the rising of the movable counterweight comes from the descending of the forkhead. There is no additional energy input, thereby reducing the amount of electricity input. Summary of the invention

[0006] The object of the present invention is to provide a mast of an electric lifting forklift with a counterweight to solve the problems raised by the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a mast of an electric lifting forklift with a counterweight, comprising a body and a fork head, wherein an electric drive unit is installed on the body;

[0008] An outer mast is fixedly mounted on the vehicle body, the inner mast can roll up and down through rollers and a first roller track in the outer mast, and the fork can roll up and down through rollers and a second roller track in the inner mast;

[0009] The electric drive unit is connected to the lifting unit, and the lifting unit includes a drum, which is connected to the electric drive unit, and a steel wire rope is wound on the drum, and the other end of the steel wire rope passes over the guide pulley and is connected to the inner mast, and the other end of the steel wire rope is connected to the ring in the inner mast;

[0010] A movable counterweight is serially connected to the steel wire rope.

[0011] Preferably, the electric drive unit includes a motor and a reducer, the reducer is fixedly mounted on the vehicle body, and the motor is connected to the reducer.

[0012] Preferably, one end of the output shaft of the motor is spline-connected to the reducer, and the other end is spline-connected to the brake, and the output shaft of the motor is connected to the brake.

[0013] Preferably, the fork is provided with a fork lifting chain hole, the outer mast is provided with an outer mast lifting chain hole, and the inner mast is installed with an inner mast sprocket.

[0014] Preferably, the inner mast sprocket is connected to a lifting plate chain.

[0015] Preferably, one end of the lifting plate chain is fixed at the lifting chain hole of the outer door frame, and the other end is fixed at the lifting chain hole of the fork.

[0016] Preferably, two reels are provided, and the two reels are respectively connected to two output shafts of the reducer.

[0017] Preferably, the movable counterweight is slidably connected to the T-shaped guide rail.

[0018] Preferably, the T-shaped guide rail is arranged on the outer door frame.

[0019] Preferably, a wire draw hanger is provided on the outer door frame, a wire draw encoder is provided on the fork head, and the wire draw head of the wire draw encoder is fixed on the wire draw hanger.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention adds a movable counterweight at the outer mast. When the fork is in a low position, the vehicle's comprehensive center of gravity is low, and the movable counterweight is in a high position, which has little effect on the stability of the vehicle. When the fork is in a high position, the movable counterweight is in a low position, which improves the vehicle's comprehensive center of gravity and is beneficial to the stability of high-position stacking of the vehicle. In addition, the movable counterweight is set up, when the inner mast and fork rise, the movable counterweight drops, and its high-position potential energy is converted into the kinetic energy of the fork lifting and finally converted into the potential energy of the fork in a high position, reducing the electric energy output of the motor and saving energy. The energy required for the movable counterweight to rise comes from the fork falling, without additional energy input, reducing energy input. At the same time, the setting of the movable counterweight reduces the output power required for the motor to drive the fork to move up.

[0022] 2. The present invention sets a wire hanger on the outer door frame, and the wire hanger is connected to a wire encoder. The wire wound in the wire encoder can be released as the inner door frame and the fork head move. The wire encoder can read the length of the released wire, and judge the distance the fork head moves according to the reading of the wire encoder, thereby judging the actual moving height of the fork head as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the electric lift forklift with counterweight of the present invention when the mast is not raised.

[0024] Figure 2 It is a schematic structural diagram of the mast of the electric lift forklift with counterweight of the present invention when it is lifted.

[0025] Figure 3 The disassembled diagram of the mast of the electric lift forklift with counterweight of the present invention.

[0026] In the figure: 1. Car body; 11. Motor; 12. Reducer; 14. Brake; 16. Drum; 2. Outer door frame; 21. Lifting chain hole of outer door frame; 25. Wire rope; 26. Guide pulley; 27. T-type guide rail; 28. Movable counterweight; 29. ​​Cable hanger; 3. Inner door frame; 31. Ring; 32. Inner door frame sprocket; 33. Lifting plate chain; 4. Fork; 41. Fork lifting chain hole; 42. Cable encoder. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Reference Figure 1-Figure 3 A mast of an electric lifting forklift with a counterweight comprises a body 1 and a fork head 4. An electric drive unit is mounted on the body 1. The electric drive unit comprises a motor 11 and a reducer 12. The reducer 12 is fixedly mounted on the body 1. The motor 11 is connected to the reducer 12. Specifically, one end of the output shaft of the motor 11 is spline-connected to the reducer 12, and the other end is spline-connected to the brake 14.

[0029] The output shaft of the motor 11 is connected to the brake 14. When the brake 14 is turned on, the output shaft of the motor 11 can be locked.

[0030] An outer mast 2 is fixedly mounted on the vehicle body 1, an inner mast 3 can roll up and down through rollers and a first roller track in the outer mast 2, and a fork head 4 can roll up and down through rollers and a second roller track in the inner mast 3;

[0031] The electric drive unit is connected to the lifting unit, and the electric drive unit drives the inner mast 3 and the fork 4 to rise through the lifting unit. The falling of the inner mast 3 and the fork 4 is driven by their own gravity.

[0032] The lifting unit can also adopt the following structure, the lifting unit includes a drum 16, the drum 16 is connected to the output shaft of the reducer 12, two drums 16 are provided, and the two drums 16 are respectively connected to the two output shafts of the reducer 12, a wire rope 25 is wound around the drum 16, and the other end of the wire rope 25 passes around the guide pulley 26 to connect to the inner door frame 3, specifically, the other end of the wire rope 25 is connected to the ring 31 in the inner door frame 3, the electric drive unit drives the drum 16 to rotate, and then the wire rope 25 is wound around the outside of the drum 16 or it is loosened, and the wire rope 25 connected to the drum 16 is wound thereon, and the wire rope 25 can pull the inner door frame 3 and the fork head 4 to move upward, and the wire rope 25 is loosened, and the inner door frame 3 and the fork head 4 fall under the action of their own gravity.

[0033] Specifically, a movable counterweight 28 is connected in series to the steel wire 25, and the movable counterweight 28 is slidably connected to the T-shaped guide rail 27, and the T-shaped guide rail 27 is arranged on the outer mast 2. The movable counterweight 28 is added to the outer mast 2, and when the fork 4 is in a low position, the vehicle's comprehensive center of gravity is low, and the movable counterweight 28 is in a high position, which has little effect on the stability of the vehicle. When the fork 4 is in a high position, the movable counterweight 28 is in a low position, which improves the vehicle's comprehensive center of gravity and is beneficial to the stability of high-position stacking of the vehicle. In addition, due to the setting of the movable counterweight 28, when the inner mast 3 and the fork head 4 rise, the movable counterweight 28 descends, and its high-position potential energy is converted into kinetic energy of the fork head 4 rising and finally into potential energy of the fork head 4 at a high position, reducing the power output of the motor 11 and saving energy. The energy required for the rising of the movable counterweight 28 comes from the descending of the fork head 4, without additional energy input, reducing energy input. At the same time, due to the setting of the movable counterweight 28, the output power required by the motor 11 to drive the fork head 4 to move upward is also reduced accordingly.

[0034] More specifically, a wire hanger 29 is provided on the outer door frame 2, and a wire encoder 42 is provided on the fork head 4, and the wire head of the wire encoder 42 is fixed on the wire hanger 29. The wire hanger 29 is provided on the outer door frame 2, and the wire hanger 29 is connected to the wire encoder 42. The wire wound in the wire encoder 42 can be released as the inner door frame 3 and the fork head 4 move. The wire encoder 42 can read the length of the wire released therein, and the distance moved by the fork head 4 is judged according to the reading of the wire encoder 42, thereby judging the overall moving height of the fork head 4.

[0035] A fork lifting chain hole 41 is provided on the fork 4, an outer mast lifting chain hole 21 is provided on the outer mast 2, an inner mast sprocket 32 ​​is installed on the inner mast 3, and a lifting plate chain 33 is connected to the inner mast sprocket 32, one end of which is fixed at the outer mast lifting chain hole 21, and the other end is fixed at the fork lifting chain hole 41.

[0036] When the fork head 4 needs to be moved upward, the motor 11 in the electric drive unit drives the drum 16 to rotate forward, winding the wire rope 25, and the wire rope 25 pulls the inner mast 3 and the fork head 4 upward. During the rising process, the inner mast sprocket 32, the lifting plate chain 33 and other components drive the fork head 4 to be lifted at twice the speed of the inner mast 3, and finally the fork head 4 is raised to a specified height.

[0037] When the motor 11 in the electric drive unit rotates in the opposite direction according to the instruction, the inner mast 3 and the fork head 4 descend under the action of their own weight.

[0038] The fork head 4 can be a three-way fork head 4, which can change the direction of the fork head 4 as needed, and is suitable for the material handling work at narrow roads in factories and warehouses.

[0039] Working principle:

[0040] The motor 11 is connected to the reducer 12 and fixed on the body 1 of the forklift. The output shafts on both sides of the reducer 12 are connected to drums 16, and a wire rope 25 is wound around the drum 16. The other end of the wire rope 25 passes over the guide pulley 26 and is connected to the inner mast 3. The lifting plate chain 33 crosses the inner mast sprocket 32 ​​on the inner mast 3, and the two ends are respectively connected to the outer mast 2 and the fork head 4.

[0041] After the motor 11 is powered on and started, the speed is reduced and the torque is amplified through the speed reducer 12, which drives the driving drum 16 to rotate. The drum 16 reels the wire rope 25 or releases the wire rope 25. When the wire rope 25 moves, it can pull the inner mast 3 connected to it to lift. During the lifting process of the inner mast 3, the inner mast sprocket 32 ​​inside it acts as a movable pulley. Under the pulling of the lifting plate chain 33, the fork head 4 is lifted at twice the speed of the inner mast 3. When descending, it is achieved by reversing the motor 11. The lifting and lowering are all controlled by the motor 11, and the speed is stable and reliable and easy to adjust. At the same time, a brake 14 is arranged at the end of the motor 11, which can stop reliably at any lifting and lowering position.

[0042] A movable counterweight 28 is arranged inside the outer mast 2. When the inner mast 3 and the fork head 4 rise, the movable counterweight 28 descends, and its potential energy at a high position is converted into kinetic energy of the fork head 4 lifting and finally into potential energy of the fork head 4 at a high position, thereby reducing the electric energy output of the motor 11 and saving energy. The energy required for the rising of the movable counterweight 28 comes from the descending of the fork head 4, without additional energy input, thereby reducing energy input. At the same time, due to the setting of the movable counterweight 28, the output power required for the motor 11 to drive the fork head 4 to move upward is also reduced accordingly.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mast of an electric lift forklift with a counterweight, comprising a body (1) and a fork head (4), characterized in that: An electric drive unit is installed on the vehicle body (1); An outer door frame (2) is fixedly mounted on the vehicle body (1); an inner door frame (3) can roll up and down via rollers and a first roller track in the outer door frame (2); and a fork head (4) can roll up and down via rollers and a second roller track in the inner door frame (3); The electric drive unit is connected to the lifting unit, and the lifting unit comprises a drum (16), the drum (16) is connected to the electric drive unit, a steel wire rope (25) is wound around the drum (16), the other end of the steel wire rope (25) is passed around a guide pulley (26) and connected to the inner door frame (3), and the other end of the steel wire rope (25) is connected to a ring (31) in the inner door frame (3); A movable counterweight (28) is serially connected to the steel wire rope (25).

2. The electric lift forklift gantry with counterweight according to claim 1, characterized in that: The electric drive unit comprises a motor (11) and a reducer (12); the reducer (12) is fixedly mounted on the vehicle body (1), and the motor (11) is connected to the reducer (12).

3. The electric lift forklift gantry with counterweight according to claim 2, characterized in that: One end of the output shaft of the motor (11) is spline-connected to the reducer (12), and the other end is spline-connected to the brake (14). The output shaft of the motor (11) is connected to the brake (14).

4. The electric lift forklift gantry with counterweight according to claim 1, characterized in that: The fork (4) is provided with a fork lifting chain hole (41), the outer door frame (2) is provided with an outer door frame lifting chain hole (21), and the inner door frame (3) is installed with an inner door frame sprocket (32).

5. The electric lift forklift mast with counterweight according to claim 4, characterized in that: The inner door frame sprocket (32) is connected to the lifting plate chain (33).

6. The electric lift forklift mast with counterweight according to claim 5, characterized in that: One end of the lifting plate chain (33) is fixed at the lifting chain hole (21) of the outer door frame, and the other end is fixed at the lifting chain hole (41) of the fork.

7. The electric lift forklift gantry with counterweight according to claim 1, characterized in that: Two reels (16) are provided, and the two reels (16) are respectively connected to the two output shafts of the reducer (12).

8. The electric lift forklift mast with counterweight according to claim 1, characterized in that: The movable counterweight (28) is slidably connected to the T-shaped guide rail (27).

9. The electric lift forklift mast with counterweight according to claim 8, characterized in that: The T-shaped guide rail (27) is arranged on the outer door frame (2).

10. The electric lift forklift mast with counterweight according to claim 1, characterized in that: A wire pull hanger (29) is arranged on the outer door frame (2), a wire pull encoder (42) is arranged on the fork head (4), and a wire pull head of the wire pull encoder (42) is fixed on the wire pull hanger (29).

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