Speed reducing mechanism of electric chain hoist

Abstract

The utility model relates to a speed reducing mechanism of an electric chain hoist. The lifting device comprises a box body 11, a lifting motor 12, an output shaft 8, a guide chain wheel 9, a lifting chain 10 and a speed reduction device, the lifting chain 10 is connected with the guide chain wheel 9, the speed reduction device comprises a small gear 1 and a large gear 2 which are meshed with each other, the small gear 1 is connected with the lifting motor 12 through a connecting assembly 13, a connecting shaft 3 is arranged on the large gear 2, and the large gear 2 is connected with the lifting motor 12. An eccentric wheel 4 with a rolling bearing is arranged on the connecting shaft 3, a balance wheel 5 is arranged outside the eccentric wheel 4 with the rolling bearing, a balance wheel supporting roller pin 7 meshed with the balance wheel 5 is arranged outside the balance wheel 5, one end of the output shaft 8 is connected with the balance wheel 5, and the guide chain wheel 9 is arranged on the output shaft 8.

Description

Technical Field

[0001] The utility model relates to an electric hoist, in particular to a speed reducing mechanism of an electric chain hoist. Background Art

[0002] The current electric chain hoist reduction mechanism mainly has the following structures:

[0003] The first structure: the reduction transmission is realized by meshing several pairs of gears. This structure will cause the volume and weight of the hoist box to be large due to the limitation of the gear meshing characteristics. This structure basically needs 3 or 4 pairs of gears to mesh in order to achieve a reduction function greater than 1:100. This results in the disadvantages of a complex gear box structure, large volume, and heavy weight, which cannot meet the needs of many occasions with relatively small space requirements.

[0004] The second structure: using a planetary gear reducer or a cycloidal pinwheel planetary reducer to achieve reduction transmission. The characteristic of this structure is that the input motor shaft is concentric with the output shaft of the planetary reducer and the axis of the brake. Since the guide sprocket of the electric chain hoist is installed on the output shaft, and the lifting chain driven by the guide sprocket is a unilateral force structure of the guide sprocket, the electric chain hoist of this structure has a large eccentricity when it is unloaded and hoisting a load, making it difficult to arrange the hanging point or upper hook of the electric chain hoist in a relatively balanced position. Often when it is unloaded, the electric chain hoist tilts at a large angle, causing the lifting chain to rub against the guide chain plate when it moves up and down when it is unloaded;

[0005] For example: The utility model with application number 93247004.1 discloses an electric chain hoist, whose main structure includes a motor, a reducer, and a hoist chain mechanism. The frame of the hoist chain mechanism is assembled into an integral body with the housing of the cycloidal pinwheel planetary reducer and the disc brake motor, and the volume is reduced compared with the traditional hand chain hoist; but due to the use of the structure of the cycloidal pinwheel planetary reducer, the five-tooth long shaft in the hoist chain mechanism serves as the output shaft of the cycloidal pinwheel planetary reducer, so that the entire output is a single-axis output, and the chain of the hoist chain mechanism is connected to the five-tooth long shaft, i.e., the output shaft, through a sprocket. This means that the installation position of the lifting chain must accommodate the position of the lifting center during lifting to ensure the lifting effect, which results in the lifting chain center of gravity shifting when the lifting chain moves up and down under no-load conditions, and it is easy to rub the chain guide plate. Summary of the invention

[0006] The utility model aims to overcome the defects in the prior art and provide an electric chain hoist speed reduction mechanism which has a simple structure, a large speed ratio, a small size, a light weight and can prevent the lifting chain from rubbing against the chain guide plate when the lifting chain is running up and down when unloaded.

[0007] The utility model is implemented as follows: an electric chain hoist reduction mechanism comprises a housing 11, a lifting motor 12, an output shaft 8, a guide sprocket 9, a lifting chain 10 and a reduction device, wherein the lifting chain 10 is connected to the guide sprocket 9, the reduction device comprises a pinion 1 and a large gear 2 meshing with each other, the pinion 1 is connected to the lifting motor 12 through a connecting assembly 13, a connecting shaft 3 is provided on the large gear 2, an eccentric wheel 4 with a rolling bearing is provided on the connecting shaft 3, a balance wheel 5 is provided outside the eccentric wheel 4 with a rolling bearing, a balance wheel 5 is provided outside the balance wheel 5, a balance wheel support roller 7 meshing with the balance wheel 5 is provided outside the balance wheel 5, one end of the output shaft 8 is connected to the balance wheel 5, and the guide sprocket 9 is arranged on the output shaft 8.

[0008] The speed ratio between the small gear 1 and the large gear 2 is 1:2 to 1:5.

[0009] The connecting assembly 13 is provided with a brake 14 .

[0010] The speed ratio of the eccentric wheel 4 with rolling bearing is 1:30 to 1:90.

[0011] Two balance wheels 5 are arranged side by side, and a spacer sleeve 6 is provided between the two balance wheels 5 .

[0012] The axes of the output shaft of the lifting motor 12, the connecting assembly 13, the small gear 1 and the brake 14 coincide with each other to form a first transmission chain, and the first transmission chain is located as a whole on the upper part of the box body 11; the axes of the large gear 2, the connecting shaft 3 and the output shaft 8 coincide with each other to form a second transmission chain, and the second transmission chain is located below the first transmission chain; the axes of the first transmission chain and the second transmission chain are parallel to each other.

[0013] The beneficial effects of the utility model are as follows: firstly, the first transmission section with a speed ratio range of 1:2 to 1:5 is realized by meshing a pair of gears of a small gear and a large gear, and then the second transmission section with a speed ratio range of 1:30 to 1:90 is obtained by connecting the connecting shaft of the large gear with the eccentric wheel 4 with rolling bearings, the balance wheel 5 and the balance wheel supporting needle roller 7, and finally a speed reduction function with a speed ratio greater than 1:100 is obtained after two speed reductions. The utility model makes full use of the parallel output of the first transmission chain and the large speed reduction ratio of the second transmission chain, so that the utility model overcomes the shortcomings of the traditional large speed ratio electric chain hoist speed reduction mechanism, and has the comprehensive advantages of simple structure, large speed ratio, small size and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the exploded structure of the speed reducer of the utility model.

[0016] Figure 3 It is a schematic diagram of the structure of the side surface of the balance wheel supporting the roller needle in the box body of the utility model.

[0017] Among them: 1. small gear; 2. large gear; 3. connecting shaft; 4. eccentric wheel with rolling bearing; 5. balance wheel; 6. spacer; 7. balance wheel supporting needle roller 7; 8. output shaft; 9. guide sprocket; 10. lifting chain; 11. box body; 12. lifting motor; 13. connecting assembly; 14. brake. DETAILED DESCRIPTION

[0018] according to Figures 1 to 3 The utility model is an electric chain hoist reduction mechanism, comprising a box 11, a lifting motor 12, an output shaft 8, a guide sprocket 9, a lifting chain 10 and a reduction device, wherein the lifting chain 10 is connected to the guide sprocket 9, and the reduction device comprises a pinion 1 and a large gear 2 that mesh with each other, the pinion 1 is connected to the lifting motor 12 through a connecting assembly 13, a connecting shaft 3 is provided on the large gear 2, an eccentric wheel 4 with a rolling bearing is provided on the connecting shaft 3, a balance wheel 5 is provided outside the eccentric wheel 4 with a rolling bearing, a balance wheel 5 is provided outside the balance wheel 5, and a balance wheel support needle 7 meshing with the balance wheel 5 is provided outside the balance wheel 5, one end of the output shaft 8 is connected to the balance wheel 5, two balance wheels 5 are arranged side by side, and a spacer 6 is provided between the two balance wheels 5.

[0019] The guide sprocket 9 is arranged on the output shaft 8. The pinion 1 is driven by the lifting motor 12 through the connecting assembly 13 and transmits torque through mutual meshing with the large gear 2. The large gear 2 is connected to the eccentric wheel 4 with rolling bearings through the connecting shaft 3 to transmit torque.

[0020] The speed ratio of the pinion 1 and the gear 2 is 1:2 to 1:5. The speed ratio of the eccentric wheel 4 with rolling bearing is 1:30 to 1:90.

[0021] The eccentric wheel 4 with rolling bearing drives the balance wheel 5 to rotate to achieve a speed reduction with a speed ratio ranging from 1:30 to 1:90.

[0022] The balance wheel 5 drives the output shaft 8 and the guide sprocket 9 installed on the output shaft 8 to transmit torque by meshing with the balance wheel supporting needle roller 7.

[0023] The connecting assembly 13 is provided with a brake 14 ; the pinion 1 is braked by the brake 14 on the connecting assembly 13 to realize the braking of the electric chain hoist of the utility model.

[0024] The axes of the output shaft of the lifting motor 12, the connecting assembly 13, the small gear 1 and the brake 14 overlap to form a first transmission chain, and the first transmission chain is located in the upper part of the box 11 as a whole; the axes of the large gear 2, the connecting shaft 3 and the output shaft 8 overlap to form a second transmission chain, and the second transmission chain is located below the first transmission chain. The axis of the first transmission chain is parallel to the axis of the second transmission chain. The weight of the parts in the first transmission chain can be used as a balancing weight when arranging the upper hanging point or upper hook of the electric chain hoist of the utility model, so that the electric chain hoist has a smaller tilt angle when it is unloaded, thereby avoiding the displacement of the center of gravity of the lifting chain 10 and preventing the lifting chain 10 from rubbing against the chain guide plate.

Claims

1. An electric chain hoist speed reduction mechanism, comprising a housing (11), a lifting motor (12), an output shaft (8), a guide sprocket (9), a lifting chain (10) and a speed reduction device, wherein the lifting chain (10) is connected to the guide sprocket (9), and is characterized in that: The reduction device comprises a small gear (1) and a large gear (2) meshing with each other, the small gear (1) being connected to the lifting motor (12) via a connecting assembly (13), the large gear (2) being provided with a connecting shaft (3), the connecting shaft (3) being provided with an eccentric wheel (4) with a rolling bearing, the eccentric wheel (4) with a rolling bearing being provided with a balance wheel (5) on the outside, the balance wheel (5) being provided with a balance wheel support needle (7) meshing with the balance wheel (5), one end of the output shaft (8) being connected to the balance wheel (5), and the guide chain wheel (9) being provided on the output shaft (8).

2. The electric chain hoist speed reduction mechanism according to claim 1, characterized in that: The speed ratio between the small gear (1) and the large gear (2) is 1:2 to 1:

5.

3. The electric chain hoist speed reduction mechanism according to claim 1, characterized in that: A brake (14) is provided on the connecting assembly (13).

4. The electric chain hoist speed reduction mechanism according to claim 1, characterized in that: The speed ratio of the eccentric wheel (4) with rolling bearing is 1:30 to 1:

90.

5. The electric chain hoist speed reduction mechanism according to claim 1, characterized in that: Two balance wheels (5) are arranged side by side, and a spacer (6) is provided between the two balance wheels (5).

6. The electric chain hoist speed reduction mechanism according to claim 1, characterized in that: The axes of the output shaft of the lifting motor (12), the connecting assembly (13), the small gear (1) and the brake (14) coincide with each other to form a first transmission chain, and the first transmission chain is located as a whole on the upper part of the box (11); the axes of the large gear (2), the connecting shaft (3) and the output shaft (8) coincide with each other to form a second transmission chain, and the second transmission chain is located below the first transmission chain; the axes of the first transmission chain and the second transmission chain are parallel to each other.

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