Electric lifting forklift portal frame with counter weight

Abstract

The utility model relates to the technical field of forklifts, and particularly discloses an electric lifting forklift portal frame with a counter weight, 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 utility model belongs to the technical field of fork truck, concretely relates to a fork truck portal with counterweight electric lifting. BACKGROUND

[0002] With the development of the logistics industry, fork trucks are diversified, and various types of fork trucks are emerging in endlessly, but fundamentally, the fork truck with high lifting still adopts a hydraulic system as a lifting power system and a hydraulic cylinder as a lifting actuator.

[0003] In the fork truck portal system with steel wire rope semi-free lifting and motor driving inclination disclosed in the Chinese patent with the announcement number CN105110254A, the fork truck includes a fork 1, a fork frame 2, a fork frame roller 3, an outer portal 4, an inner portal 11, a lower hinge base 12, a portal roller 15 and a side roller 19, wherein the fork and the fork frame roller are installed on the fork frame, the fork frame roller is placed in the C-shaped slide of the inner portal, the portal roller is installed on the outer portal and placed in the L-shaped slide of the inner portal, the side roller is located in the inner portal roller shaft, and the portal is bolted to the lower hinge base.

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

[0005] When the above device is used, the power for lifting the goods on the fork is completely provided by the motor, and a large amount of power cost needs to be consumed during the lifting of the goods, therefore, the application provides the fork truck portal with counterweight electric lifting, which is internally provided with a movable counterweight, the movable counterweight is lowered when the inner portal and the fork head are lifted, the potential energy of the movable counterweight at the high position is converted into the kinetic energy of the lifting of the fork head and finally converted into the potential energy of the fork head at the high position, the power output of the motor is reduced, energy is saved, and the energy required for the lifting of the movable counterweight comes from the lowering of the fork head, without additional energy input, thereby reducing the power input. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing the fork truck portal with counterweight electric lifting to solve the problems in the above background technology.

[0007] To achieve the above purpose, the utility model provides the following technical scheme, a fork truck portal with counterweight electric lifting, which comprises a vehicle body and a fork head, the vehicle body is provided with a power driving unit;

[0008] The vehicle body is fixedly provided with an outer portal, the inner portal is up and down rollable with a first rolling way in the outer portal through a roller, and the fork head is up and down rollable with a second rolling way of the inner portal through a roller;

[0009] The power driving unit is connected with a lifting unit, the lifting unit comprises a winding drum, the winding drum is connected with the power driving unit, a steel wire rope is wound on the winding drum, the other end of the steel wire rope passes through a guide sheave and is connected with a thimble in an inner gantry, and the other end of the steel wire rope is connected with the thimble in the inner gantry.

[0010] The steel wire rope is connected with a movable counterweight.

[0011] Preferably, the power driving unit comprises a motor and a speed reducer, the speed reducer is fixedly installed on the vehicle body, and the motor is connected with the speed reducer.

[0012] Preferably, one end of an output shaft of the motor is connected with the speed reducer through a spline, the other end of the output shaft of the motor is connected with a brake through the spline, and the output shaft of the motor is connected with the brake.

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

[0014] Preferably, the inner gantry sprocket is connected with a lifting plate chain.

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

[0016] Preferably, two winding drums are arranged, and the two winding drums are connected with two output shafts of the speed reducer respectively.

[0017] Preferably, the movable counterweight is connected with a T-shaped guide rail in a sliding mode.

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

[0019] Preferably, a pull wire hanger is arranged on the outer gantry, a pull wire encoder is arranged on the fork head, and a pull wire head of the pull wire encoder is fixed on the pull wire hanger.

[0020] Compared with the prior art, the utility model has the advantages of:

[0021] Firstly, the utility model adds a movable counterweight at the outer gantry, when the fork head is at a low position, the overall center of gravity of the vehicle is low, the movable counterweight is at a high position, and the influence on the stability of the vehicle is small, when the fork head is at a high position, the movable counterweight is at a low position, and the overall center of gravity of the vehicle is improved, which is beneficial to the stability of the vehicle at a high position. The setting of the movable counterweight is that when the inner gantry and the fork head are lifted, the movable counterweight is lowered, the potential energy at a high position is converted into kinetic energy of lifting of the fork head and is finally converted into potential energy of the fork head at a high position, the electric energy output of the motor is reduced, energy is saved, the energy required for lifting of the movable counterweight comes from lowering of the fork head, no additional energy is input, energy input is reduced, and the output power required during lifting of the fork head by the motor is also reduced correspondingly.

[0022] Second, the utility model discloses the pull -in line hanger is set up on the outer door frame, and the pull -in line hanger connects the pull -in line encoder, and the line that the pull -in line encoder is rolled up can be released with the movement of the inner door frame and prong head, and the pull -in line encoder can read the length of the line release in it, and the distance of prong head movement is judged according to the reading of the pull -in line encoder, so that the actual moving height of prong head whole body is judged. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is the structural schematic diagram of the utility model for the structure of the electric lift fork truck door frame with counterweight when not lifting.

[0024] Fig. 2 It is the structural schematic diagram of the utility model for the structure of the electric lift fork truck door frame with counterweight when lifting.

[0025] Fig. 3 It is the split view of the utility model for the electric lift fork truck door frame with counterweight.

[0026] In the drawing: 1, vehicle body;11, motor;12, speed reducer;14, brake;16, winding drum;2, outer door frame;21, outer door frame lifting chain hole;25, steel wire rope;26, guide pulley;27, T-shaped guide rail;28, movable counterweight;29, pull-in line hanger;3, inner door frame;31, thimble;32, inner door frame chain wheel;33, lifting plate type chain;4, prong head;41, prong head lifting chain hole;42, pull-in line encoder. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0028] Referring to Figs. 1-3 A kind of electric lift fork truck door frame with counterweight, including vehicle body 1, prong head 4, vehicle body 1 is installed with electric drive unit, and electric drive unit includes motor 11, speed reducer 12, speed reducer 12 is fixedly installed on vehicle body 1, motor 11 is connected with speed reducer 12, specifically, the output shaft of motor 11 one end is connected with speed reducer 12 spline, and the other end is connected with brake 14 spline;

[0029] The output shaft of motor 11 is connected with brake 14, and brake 14 can lock the output shaft of motor 11 when being opened;

[0030] The outer door frame 2 is fixedly installed on the vehicle body 1, the inner door frame 3 is up and down rollable through a roller and a first rolling track in the outer door frame 2, and the fork head 4 is up and down rollable through a roller and a second rolling track in the inner door frame 3.

[0031] The power driving unit is connected with the lifting unit, and the power driving unit drives the inner door frame 3 and the fork head 4 to rise through the lifting unit. The falling of the inner door frame 3 and the fork head 4 is driven by their own gravity.

[0032] The lifting unit can also adopt the following structure. The lifting unit comprises two winding drums 16, the winding drums 16 are connected with the output shafts of the speed reducers 12, the winding drums 16 are provided in pairs, and the two winding drums 16 are connected with the two output shafts of the speed reducers 12 respectively. Steel wires 25 are wound on the winding drums 16, and the other ends of the steel wires 25 are wound around a guide pulley 26 and connected with the inner door frame 3. Specifically, the other ends of the steel wires 25 are connected with the eyelets 31 in the inner door frame 3. The power driving unit drives the winding drums 16 to rotate, so that the steel wires 25 are wound on the outside of the winding drums 16 or are loosened. The steel wires 25 connected with the winding drums 16 are wound on the winding drums 16, so that the inner door frame 3 and the fork head 4 can be pulled to move upwards. When the steel wires 25 are loosened, 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 with the steel wires 25 in series, the movable counterweight 28 is connected with a T-shaped guide rail 27 in a sliding mode, and the T-shaped guide rail 27 is arranged on the outer door frame 2. The movable counterweight 28 is arranged at the outer door frame 2. When the fork head 4 is at a low position, the overall gravity center of the vehicle is low, and the movable counterweight 28 is at a high position, so that the influence on the stability of the vehicle is small. When the fork head 4 is at a high position, the movable counterweight 28 is at a low position, so that the overall gravity center of the vehicle is improved, and the stability of the vehicle at the high position is improved. The arrangement of the movable counterweight 28 is that when the inner door frame 3 and the fork head 4 rise, the movable counterweight 28 falls, the potential energy of the high position of the movable counterweight 28 is converted into kinetic energy of the rising of the fork head 4, and is finally converted into potential energy of the high position of the fork head 4. The energy output of the motor 11 is reduced, and the energy is saved. The energy required by the rising of the movable counterweight 28 is obtained from the falling of the fork head 4, and no additional energy is input. The energy input is reduced. At the same time, the arrangement of the movable counterweight 28 is that the output power required by the motor 11 to drive the fork head 4 to move upwards is also reduced correspondingly.

[0034] More specifically, a pull wire hanger 29 is arranged on the outer door frame 2, a pull wire encoder 42 is arranged on the fork head 4, and the pull wire head of the pull wire encoder 42 is fixed on the pull wire hanger 29. The pull wire hanger 29 is arranged on the outer door frame 2, and the pull wire hanger 29 is connected with the pull wire encoder 42. The wire wound in the pull wire encoder 42 can be unwound with the movement of the inner door frame 3 and the fork head 4. The pull wire encoder 42 can read the length of the wire unwound in it, and the distance of the movement of the fork head 4 can be judged according to the reading of the pull wire encoder 42, so that the moving height of the fork head 4 as a whole can be judged.

[0035] The fork head 4 is provided with a fork head lifting chain hole 41, the outer mast 2 is provided with an outer mast lifting chain hole 21, the inner mast 3 is equipped with an inner mast sprocket 32, and the lifting plate chain 33 is connected to the inner mast sprocket 32, with one end fixed at the outer mast lifting chain hole 21 and the other end fixed at the fork head lifting chain hole 41.

[0036] When it is necessary to move the fork head 4 upward, the motor 11 in the electric drive unit drives the drum 16 to rotate in the forward direction, winding the steel wire rope 25. The steel wire rope 25 pulls the inner mast 3 and the fork head 4 upward. During the upward process, the fork head 4 is lifted at twice the speed of the inner mast 3 through components such as the inner mast sprocket 32 ​​and the lifting plate chain 33, and finally the fork head 4 is raised to the designated height.

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

[0038] The fork head 4 can be a three-way fork head 4, which can be changed in direction as needed, and is suitable for material handling in narrow roads in factory areas and warehouses.

[0039] Working principle:

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

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

[0042] The outer mast 2 is equipped with a movable counterweight 28. When the inner mast 3 and fork 4 rise, the movable counterweight 28 descends. Its potential energy at a high position is converted into the kinetic energy for the fork 4 to rise and ultimately into the potential energy for the fork 4 to be at a high position. This reduces the electrical energy output of the motor 11 and saves energy. The energy required for the movable counterweight 28 to rise comes from the descent of the fork 4. There is no additional energy input, which reduces energy input. At the same time, with the movable counterweight 28, the output power required by the motor 11 to drive the fork 4 to move upward is also reduced accordingly.

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

Claims

1. A counterweight electric lifting forklift mast, comprising a body (1) and forks (4), characterized in that, An electric drive unit is installed on the vehicle body (1); An outer mast (2) is fixedly installed on the vehicle body (1). The inner mast (3) can roll up and down with the first roller in the outer mast (2) through rollers. The fork head (4) can roll up and down with the second roller in the inner mast (3) through rollers. The electric drive unit is connected to the lifting unit, which includes a drum (16) connected to the electric drive unit. A wire rope (25) is wound on the drum (16). The other end of the wire rope (25) passes around the guide pulley (26) and is connected to the inner gantry (3). The other end of the wire rope (25) is connected to the collar (31) in the inner gantry (3). A movable counterweight (28) is connected in series on the wire rope (25).

2. The electric lifting forklift mast with counterweight according to claim 1, characterized in that, The electric drive unit includes a motor (11) and a reducer (12). The reducer (12) is fixedly installed on the vehicle body (1), and the motor (11) is connected to the reducer (12).

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

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

5. A counterweight electric lifting forklift mast according to claim 4, characterized in that, The inner gantry sprocket (32) is connected to the lifting plate chain (33).

6. The electric lifting 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 gantry, and the other end is fixed at the lifting chain hole (41) of the fork head.

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

8. The electric lifting 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. A counterweight electric lifting forklift mast according to claim 8, characterized in that, The T-shaped guide rail (27) is installed on the outer gantry (2).

10. A counterweight electric lifting forklift mast according to claim 1, characterized in that, The outer gantry (2) is provided with a pull wire bracket (29), and the fork head (4) is provided with a pull wire encoder (42). The pull wire head of the pull wire encoder (42) is fixed on the pull wire bracket (29).

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