Lifting mechanism for electric forklift

Abstract

The utility model discloses a lifting mechanism for an electric forklift, which relates to the technical field of electric forklifts and comprises a case fixedly connected to an electric forklift body, a fork plate is connected to the case through a lifting structure, and the lifting structure comprises two lead screws, two threaded blocks, a servo driving component and a damping component. The servo driving assembly comprises a motor support, a servo motor, a transmission shaft, two worms and two worm wheels. Through the self-locking performance after the worm and the worm gear are meshed, the output bearing of the servo motor can be prevented from being damaged due to large reverse torque, the failure rate of the lifting mechanism is reduced, and the operation stability of the lifting mechanism is improved; through the arrangement of the damping assembly, when the lifting mechanism of the electric forklift lifts goods, vibration can be effectively reduced, the stability of the goods is improved, the safety of workers in the operation process is improved, damage to the forklift structure is reduced, and the service life of the forklift is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric forklifts, in particular to a lifting mechanism for electric forklifts. Background Art

[0002] After searching, the patent with application number 202122611968.6 discloses a lifting mechanism for a small electric forklift, which includes a mounting box, two connecting frames, a fork plate and a lifting assembly. The patent starts the motor, the output shaft of the motor rotates to drive the connecting shaft to rotate, the connecting shaft rotates to drive the second bevel gear to rotate, the second bevel gear rotates to drive the first bevel gear to rotate, the first bevel gear rotates to drive the reciprocating screw to rotate, and the reciprocating screw rotates to drive the lifting plate to perform lifting and lowering movements. However, the prior art still has the following problems:

[0003] First, the bevel gear is used for transmission, and its self-locking performance is poor, which will cause the output shaft of the motor to be damaged by a large reverse torque during the lifting process of the fork plate, thereby increasing the failure rate of the lifting mechanism and reducing the stability of the lifting mechanism;

[0004] Secondly, electric forklifts will generate vibrations when lifting goods, which will reduce the stability of the goods, reduce the safety of workers during operation, and easily cause certain damage to the forklift, reducing the service life of the forklift. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a lifting mechanism for an electric forklift. In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lifting mechanism for an electric forklift, comprising a chassis fixedly connected to the electric forklift body, a fork plate connected to the chassis via a lifting structure, and the lifting structure comprising two lead screws rotatably mounted in the chassis, two threaded blocks screwed in turn to the two lead screws, a servo drive assembly and a shock absorbing assembly;

[0007] The servo drive assembly includes a motor bracket welded to the upper outer wall of one side of the chassis, a servo motor fixedly installed on the outer wall of the motor bracket, a transmission shaft rotatably installed in the chassis, two worms fixedly mounted on the transmission shaft, and two worm wheels fixedly mounted on the upper parts of the two lead screws in turn, and the two worms are respectively meshed with the two worm wheels.

[0008] Preferably, two limiting slides are provided on one side of the chassis, and two threaded blocks are slidably connected to the two limiting slides respectively.

[0009] Preferably, the output shaft of the servo motor passes through the motor bracket and is coaxially connected to one end of the transmission shaft through a coupling.

[0010] Preferably, the shock absorbing assembly includes a same support frame welded to the side walls of the two threaded blocks, a connecting frame fixedly connected to the fork plate, two dampers installed between the support frame and the connecting frame, and two shock absorbing vertical springs sequentially mounted on the two dampers.

[0011] Preferably, the shock absorbing assembly also includes a mounting groove opened at the top of the support frame, a guide transverse axis fixed in the mounting groove, two guide blocks, two linkage oblique rods symmetrically hinged at the top of the two guide blocks, and a shock absorbing transverse spring sleeved on the guide transverse axis.

[0012] Preferably, the top ends of the two linked oblique rods are hinged to the bottom of the connecting frame, and the two ends of the shock-absorbing transverse spring are respectively fixed to the outer walls of the two guide blocks on opposite sides.

[0013] Preferably, guide holes are formed on the two guide blocks, and inner walls of the two guide holes are slidably connected to the outer wall of the guide transverse axis.

[0014] The beneficial effects of the utility model are:

[0015] 1. The lifting structure designed by the utility model drives the two worms on the transmission shaft to rotate forward and backward through the servo motor, and then the two worm wheels meshing with the two worms control the two lead screws to rotate forward and backward. Under the limit of the two limit slideways, the two threaded blocks control the fork plate to perform lifting and lowering movements. In this way, the self-locking performance after the worm and the worm wheel meshing can prevent the output shaft of the servo motor from being damaged by a large reverse torque, thereby reducing the failure rate of the lifting mechanism and improving the stability of the lifting mechanism.

[0016] 2. Through the provision of the shock-absorbing assembly, the lifting mechanism of the electric forklift can effectively reduce vibration when lifting goods, improve the stability of the goods, improve the safety of workers during operation, reduce damage to the forklift structure, and extend the service life of the forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model after the top and one side of the chassis are cut off;

[0018] Figure 2 For this utility model Figure 1 A schematic diagram of the three-dimensional enlarged structure of part A;

[0019] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the chassis in the utility model;

[0021] Figure 5It is a three-dimensional enlarged structural schematic diagram of the shock absorbing component in the utility model.

[0022] In the figure: 1. Electric forklift body; 2. Chassis; 3. Fork plate; 4. Lead screw; 5. Threaded block; 6. Motor bracket; 7. Servo motor; 8. Transmission shaft; 9. Worm; 10. Worm wheel; 11. Limit slideway; 12. Support frame; 13. Connecting frame; 14. Damper; 15. Shock-absorbing vertical spring; 16. Guide horizontal axis; 17. Guide block; 18. Linkage diagonal rod; 19. Shock-absorbing horizontal spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Example 1, reference Figure 1-4 A lifting mechanism for an electric forklift includes a chassis 2 fixedly connected to an electric forklift body 1, a fork plate 3 is connected to the chassis 2 through a lifting structure, and the lifting structure includes:

[0025] Two lead screws 4 and two thread blocks 5: the two lead screws 4 are rotatably mounted in the chassis 2, and the two thread blocks 5 are screwed onto the two lead screws 4 in sequence;

[0026] Servo drive assembly: it includes a motor bracket 6 welded to the upper outer wall of one side of the chassis 2, a servo motor 7 fixedly mounted on the outer wall of the motor bracket 6, a transmission shaft 8 rotatably mounted in the chassis 2, two worms 9 fixedly sleeved on the transmission shaft 8, and two worm wheels 10 fixedly sleeved on the upper parts of the two lead screws 4 in sequence, and the two worms 9 are respectively meshed with the two worm wheels 10;

[0027] Furthermore, two limiting slideways 11 are provided on one side of the chassis 2, and the two threaded blocks 5 are respectively slidably connected with the two limiting slideways 11, which can ensure that the two threadedly connected threaded blocks 5 make linear motion, and the output shaft of the servo motor 7 passes through the motor bracket 6 and is coaxially connected with one end of the transmission shaft 8 through a coupling, which can ensure that the servo motor 7 drives the transmission shaft 8 to rotate;

[0028] In the specific implementation of this embodiment: the two worm gears 9 on the transmission shaft 8 are driven by the servo motor 7 to rotate forward and reversely, and then the two worm wheels 10 engaged with the two worm gears 9 will control the two lead screws 4 to rotate forward and reversely. Under the limitation of the two limiting slides 11, the two threaded blocks 5 will control the fork plate 3 to perform lifting and lowering movements. In this way, the self-locking performance after the engagement of the worm gear 9 and the worm wheel 10 can prevent the output shaft of the servo motor 7 from being damaged by a large reverse torque, thereby reducing the failure rate of the lifting mechanism and improving the stability of the lifting mechanism operation.

[0029] Example 2, reference Figure 3-5 This embodiment is optimized on the basis of the first embodiment, specifically: the lifting structure further includes a shock absorbing component, and the shock absorbing component includes:

[0030] Support frame 12 and connecting frame 13: the support frame 12 is welded to the side walls of the two threaded blocks 5, and the connecting frame 13 is fixedly connected to the fork plate 3;

[0031] Two dampers 14 and two shock-absorbing vertical springs 15: The two dampers 14 are installed between the support frame 12 and the connecting frame 13, and the two shock-absorbing vertical springs 15 are sequentially sleeved on the two dampers 14;

[0032] Mounting slot and guide transverse shaft 16: The mounting slot is provided at the top of the support frame 12, and the guide transverse shaft 16 is fixed in the mounting slot;

[0033] Two guide blocks 17: guide holes are formed on the two guide blocks 17, and the inner walls of the two guide holes are slidably connected to the outer wall of the guide horizontal shaft 16;

[0034] Two linkage oblique rods 18: The two linkage oblique rods 18 are symmetrically hinged to the tops of the two guide blocks 17, and the tops of the two linkage oblique rods 18 are hinged to the bottom of the connecting frame 13;

[0035] Shock-absorbing transverse spring 19: The shock-absorbing transverse spring 19 is sleeved on the guide transverse shaft 16, and the two ends of the shock-absorbing transverse spring 19 are respectively fixed on the outer walls of the two guide blocks 17 on opposite sides;

[0036] In the implementation of this embodiment: when vibration occurs on the fork plate 3, the connecting frame 13 will be caused to move, and then the two shock-absorbing vertical springs 15 on the two dampers 14 will be elastically deformed, and then the two linked inclined rods 18 will control the two guide blocks 17 to slide on the guide transverse axis 16, which will cause the shock-absorbing transverse spring 19 to be elastically deformed. In this way, the lifting mechanism of the electric forklift can effectively reduce vibration when lifting goods, improve the stability of the goods, improve the safety of workers during operation, reduce damage to the forklift structure, and extend the service life of the forklift.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lifting mechanism for an electric forklift, comprising a chassis (2) fixedly connected to an electric forklift body (1), characterized in that: The chassis (2) is connected to a fork plate (3) via a lifting structure, and the lifting structure comprises two lead screws (4) rotatably mounted in the chassis (2), two threaded blocks (5) sequentially screwed to the two lead screws (4), a servo drive assembly and a shock absorbing assembly; The servo drive assembly comprises a motor bracket (6) welded to the upper outer wall of one side of a chassis (2), a servo motor (7) fixedly mounted on the outer wall of the motor bracket (6), a transmission shaft (8) rotatably mounted in the chassis (2), two worms (9) fixedly mounted on the transmission shaft (8), and two worm wheels (10) fixedly mounted on the upper parts of two lead screws (4) in sequence, and the two worms (9) are respectively meshed with the two worm wheels (10).

2. The lifting mechanism for an electric forklift according to claim 1, characterized in that: Two limiting slideways (11) are provided on one side of the chassis (2), and the two threaded blocks (5) are respectively slidably connected to the two limiting slideways (11).

3. The lifting mechanism for an electric forklift according to claim 1, characterized in that: The output shaft of the servo motor (7) passes through the motor bracket (6) and is coaxially connected to one end of the transmission shaft (8) through a coupling.

4. The lifting mechanism for an electric forklift according to claim 1, characterized in that: The shock absorbing assembly comprises a common support frame (12) welded to the side walls of two threaded blocks (5), a connecting frame (13) fixedly connected to the fork plate (3), two dampers (14) installed between the support frame (12) and the connecting frame (13), and two shock absorbing vertical springs (15) sequentially sleeved on the two dampers (14).

5. The lifting mechanism for an electric forklift according to claim 1, characterized in that: The shock absorbing assembly also includes a mounting groove opened at the top of the support frame (12), a guide transverse shaft (16) fixed in the mounting groove, two guide blocks (17), two linkage oblique rods (18) symmetrically hinged to the tops of the two guide blocks (17), and a shock absorbing transverse spring (19) sleeved on the guide transverse shaft (16).

6. The lifting mechanism for an electric forklift according to claim 5, characterized in that: The top ends of the two linkage oblique rods (18) are hinged to the bottom of the connecting frame (13), and the two ends of the shock-absorbing transverse spring (19) are respectively fixed to the outer walls of the two guide blocks (17) on opposite sides.

7. The lifting mechanism for an electric forklift according to claim 5, characterized in that: The two guide blocks (17) are each provided with a guide hole, and the inner walls of the two guide holes are slidably connected to the outer wall of the guide transverse shaft (16).

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