Safe electric hoist

Abstract

The utility model discloses a safety type electric hoist which comprises a driving motor and a chain wheel, the driving motor comprises a motor shaft, the motor shaft is hollow and is provided with an output shaft in a penetrating mode, and one end of the motor shaft and one end of the output shaft are provided with a clutch for connecting and transmitting the motor shaft and the output shaft. The clutch is arranged between the output shaft and the motor shaft, and the output shaft can be stopped by the aid of the brake, so that in the hoisting process, even if the friction position of the clutch fails due to the fact that the temperature of the clutch is too high, the clutch can be stopped by the brake, and the friction position of the clutch can be stopped. And at the moment, the output shaft can still be stopped by means of the brake, so that the chain wheel is stopped, the risk that heavy objects in the air accidentally fall off is avoided, and the use safety is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric hoist field especially is related to a safe electric hoist. BACKGROUND

[0002] Electric hoist is a kind of special hoisting equipment, is installed on headstock gear, gantry crane, electric hoist has small volume, light weight, simple operation, easy to use etc., is used in industrial and mining enterprises, warehouse, wharf etc.

[0003] When the electric hoist mainly includes drive motor and sprocket box etc., drive motor output power is driven to the sprocket rotation in sprocket box, the sprocket rotation is rolled up chain and realizes the hoisting of heavy object, currently, in order to prevent the overload condition of electric hoist, clutch is usually set on sprocket, the output end of clutch is connected with sprocket, the input end of clutch is connected with the output shaft of drive motor, when encountering heavy overload, clutch disconnects the transmission of drive motor and sprocket, at this moment, heavy cannot be lifted, and reduce the security risk generated by hoisting heavy overload.

[0004] But in actual use, there is no overload of heavy being lifted, due to the friction of clutch of electric hoist being used for a long time, the temperature is too high to exist failure, at this moment, the heavy in the air exists the security risk of accidental falling, and further improvement is needed. UTILITY MODEL CONTENTS

[0005] In order to further improve safety, the application provides a safe electric hoist.

[0006] The application provides a safe electric hoist, adopts the following technical scheme:

[0007] A safe electric hoist, including drive motor and sprocket, the drive motor includes motor shaft, the motor shaft is hollow and is provided with output shaft, the motor shaft and the one end of output shaft are provided with clutch connecting both transmission, the output shaft is provided with brake away from the one end of clutch and the end is transmission connection with sprocket.

[0008] Optionally, the output shaft and the sprocket are provided with the reducer connecting both.

[0009] Optionally, the output shaft includes motor output shaft and primary tooth shaft, the one end of primary tooth shaft is keyed with motor output shaft, and the sprocket is provided with through hole for primary tooth shaft to pass through.

[0010] Optionally, the clutch comprises a driving disc, a driven disc and a spring, the driving disc is connected to the motor shaft, the driven disc is axially slidably connected to the output shaft, the driven disc is circumferentially linked with the output shaft, the spring drives the driven disc to abut against the driving disc, and the output shaft is threadedly connected with a adjusting nut abutting against the spring.

[0011] Optionally, the output shaft is axially slidably connected with a secondary disc, the secondary disc is located between the driven disc and the driving disc, one side of the secondary disc abuts against the driving disc, and the other side of the secondary disc abuts against the driven disc, and the two sides of the secondary disc are provided with friction plates.

[0012] Optionally, the driving disc is fixedly provided with a cooling fan, the cooling fan is detachably connected with the driving disc, and the cooling fan is externally provided with a fan cover.

[0013] Optionally, the reducer comprises a gear box and an internal transmission gear, the output shaft has a worm part, the transmission gear comprises a double gear and a secondary driven gear, the double gear has a first gear meshing with the worm part, and the secondary driven gear is arranged on a chain wheel, and the double gear has a second gear meshing with the secondary driven gear.

[0014] Optionally, the spring is a butterfly spring.

[0015] Optionally, the cooling fan extends with a connecting column, the connecting column has a plurality of columns around the circumference, the connecting column is hollow and provided with a screw, and the screw is connected and fixed with the driving disc.

[0016] Optionally, the chain wheel is externally provided with a chain wheel box, the driving motor comprises a motor shell, the motor shell is fixed with the chain wheel box through a screw, the top of the chain wheel box is provided with a lifting part, and the lifting part is provided with a lifting hole.

[0017] In summary, the present application comprises at least one of the following beneficial technical effects:

[0018] 1. By arranging the clutch between the output shaft and the motor shaft, the output shaft can be stopped by the brake, so that even if the clutch fails due to excessive temperature during lifting, the brake can still be used to stop the output shaft to stop the chain wheel, avoiding the risk of accidental falling of the heavy object in the air, effectively improving the safety of use.

[0019] 2. The output shaft adopts the axial combination connection mode of the motor output shaft and the primary tooth shaft, which effectively reduces the overall strength of the output shaft, is more convenient for separate processing and manufacturing, reduces the manufacturing difficulty and improves the production efficiency.

[0020] 3. The cooling fan is directly fixed to the drive disc of the motor shaft. Even if the clutch slips and fails under overload hoisting conditions, the cooling fan will always be in a rotating state, keeping the electric hoist in a good heat dissipation state and having efficient heat dissipation performance.

[0021] 4. By utilizing the design of the auxiliary disc, the contact area at the clutch friction point is effectively increased, thereby improving the transmission stability at the friction point. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of Example 1.

[0023] Figure 2 This is a cross-sectional view of Example 1.

[0024] Figure 3 This is a diagram of the internal structure of the reducer in Example 1.

[0025] Figure 4 This is a cross-sectional view of Example 2.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Drive motor; 2. Sprocket box; 3. Reducer; 4. Sprocket; 5. Motor housing; 6. Stator; 7. Rotor; 8. Motor shaft; 9. Motor output shaft; 10. Primary gear shaft; 11. Clutch; 12. Through hole; 13. Brake; 14. Driving disc; 15. Driven disc; 16. Disc spring; 17. Friction plate; 18. Adjusting nut; 19. Cooling fan; 20. Fan cover; 21. Connecting column; 22. Gearbox; 23. Double gear; 24. Secondary driven gear; 25. First gear; 26. Second gear; 27. Worm gear; 28. Heat sink; 29. ​​Lifting part; 30. Lifting hole; 31. Auxiliary disc. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] Example 1

[0030] A type of safety electric hoist, such as Figure 1 and Figure 2As shown, including driving motor 1, sprocket box 2 and reducer 3, the sprocket box 2 is rotatably connected with sprocket 4, the driving motor 1 includes motor shell 5, stator 6, rotor 7 and motor shaft 8, the motor shaft 8 is hollow and is provided with an output shaft matched therewith, the output shaft includes motor output shaft 9 and primary tooth shaft 10, the output shaft 9 of the driving motor 1 is located in the motor shaft 8, the primary tooth shaft 10 is coaxially arranged with the motor output shaft 9, one end of the primary tooth shaft 10 is splined with the motor output shaft 9 to realize transmission, one end of the motor shaft 8 is connected with one end of the motor output shaft 9 through the clutch 11 to realize transmission, one end of the primary tooth shaft 10 away from the motor output shaft 9 is connected with the input end of the reducer 3, the sprocket 4 is provided with a through hole 12 for the primary tooth shaft 10 to pass through, the output end of the reducer 3 is connected with the sprocket 4, and the brake 13 is arranged at the end of the primary tooth shaft 10 to brake it, the brake 13 is an electromagnetic brake in the embodiment, the motor shaft 8 rotates after the driving motor 1 is started and drives the motor output shaft 9 and the primary tooth shaft 10 through the clutch 11, the primary tooth shaft 10 rotates and finally drives the sprocket 4 to rotate after being decelerated by the reducer 3, and the chain on the sprocket 4 can realize lifting of the heavy object, when the weight of the heavy object is overloaded, the clutch 11 slips at the friction position to disconnect the transmission, at this time, the driving motor 1 idles and cannot lift the heavy object, achieving the purpose of anti-overload lifting.

[0031] By arranging the clutch 11 between the output shaft and the motor shaft 8, the output shaft can be stopped by the brake 13, so that when the clutch 11 fails due to high temperature during lifting, the brake 13 can still stop the output shaft to stop the sprocket 4, avoiding the risk of accidental falling of the heavy object in the air, effectively improving the safety of use, in addition, the motor output shaft 9 is arranged in the motor shaft 8, and the primary tooth shaft 10 is arranged in the sprocket 4, effectively improving the compactness of the overall structure, making the electric hoist smaller in size.

[0032] Moreover, the output shaft adopts the axial combination connection mode of the motor output shaft 9 and the primary tooth shaft 10, effectively reducing the overall strength of the output shaft, facilitating separate processing and manufacturing, reducing manufacturing difficulty and improving production efficiency.

[0033] As Figure 1 and Figure 2As shown, the clutch 11 includes a driving disc 14, a driven disc 15 and a spring, the driving disc 14 is fixedly connected on the motor shaft 8, the driven disc 15 is circumferentially linked with the motor output shaft 9, the driven disc 15 is axially slidingly connected on the motor output shaft 9, the spring is a butterfly spring 16 and drives the driven disc 15 to always abut against the driving disc 14, the side of the driven disc 15 towards the driving disc 14 is provided with a friction plate 17, the power transmission is realized by the abutment of the friction plate 17 and the driving disc 14, the design of the friction plate 17 can improve the wear resistance of the abutment place, improve the service life of the clutch 11, in addition, an adjusting nut 18 is threadedly connected on the end of the motor output shaft 9, the adjusting nut 18 abuts against one end of the butterfly spring 16, the other end of the butterfly spring 16 abuts against the driven disc 15, the adjustment of the spring force of the butterfly spring 16 can be realized by rotating the adjusting nut 18, thereby realizing the adjustment of the overload weight of the electric hoist during hoisting, having better practicability.

[0034] As shown in Figure 1 and Figure 2 , a cooling fan 19 is fixedly arranged on the driving disc 14, the cooling fan 19 is detachably connected with the driving disc 14, the outside of the cooling fan 19 is provided with a fan cover 20 for covering and shielding, the fan cover 20 shields and protects the internal cooling fan 19, the fan cover 20 is detachably connected with the motor housing 5 of the driving motor 1 through screws, the cooling fan 19 has connecting columns 21, the connecting columns 21 are uniformly distributed around the circumference, the connecting columns 21 are hollow inside and pass through screws, the detachable connection is realized by the connection and fixation of the screws and the driving disc 14, the cooling fan 19 is directly fixedly connected on the driving disc 14 of the motor shaft 8, even in the case of overload hoisting environment and clutch 11 slipping failure, the cooling fan 19 is always in the rotating working state, the electric hoist is always in good heat dissipation state, having high heat dissipation performance.

[0035] As shown in Figure 2 and Figure 3 , the speed reducer 3 includes a gear box 22 and internal transmission gears, the transmission gears include a double gear 23 and a secondary driven gear 24, the double gear 23 is rotatably connected in the gear box 22 and includes a first gear 25 and a second gear 26, the primary gear shaft 10 has a worm portion 27 meshing with the first gear 25, the primary gear shaft 10 realizes primary speed reduction through the first gear 25 and the worm portion 27 when rotating, the secondary driven gear 24 is keyed connected on the sprocket 4, the second gear 26 meshes with the secondary driven gear 24, the outer diameter of the secondary driven gear 24 is larger than that of the second gear 26, so that secondary speed reduction can be realized at the secondary driven gear 24 during power transmission, achieving better speed reduction effect, in addition, the meshing of the worm portion 27 and the first gear 25 also plays a certain reverse effect, better preventing the heavy object from falling accidentally during hoisting.

[0036] AsFigure 1 and Figure 3 As shown, heat sinks 28 are distributed on the outside of the motor housing 5 of the drive motor 1. One side of the motor housing 5 is connected and fixed to the fan cover 20, and the other side is connected and fixed to the sprocket box 2. The side of the sprocket box 2 away from the motor housing 5 is connected and fixed to the gear box 22, realizing the sequential modularization of the structure. The motor housing 5, fan cover 20, sprocket box 2 and gear box 22 are detachably connected to each other, which facilitates subsequent disassembly, assembly and maintenance. In addition, there is a lifting part 29 on the top of the sprocket box 2. Two lifting parts 29 are distributed at intervals. Lifting holes 30 are opened on the lifting parts 29. The design of the lifting parts 29 facilitates the overall lifting and transportation of the electric hoist.

[0037] In addition, bearings are provided at the ends of the motor shaft 8, the motor output shaft 9, and the first-stage gear shaft 10. The bearings support the motor shaft and effectively improve the smoothness of its rotation and reduce the frictional resistance during rotation.

[0038] Example 2

[0039] A type of safety electric hoist, such as Figure 4 As shown, the main difference between this embodiment and Embodiment 1 lies in the different structure of the clutch 11. In this embodiment, a secondary disc 31 is provided between the driving disc 14 and the driven disc 15. Friction plates 17 are provided on both sides of the secondary disc 31 to abut against the driving disc 14 and the driven disc 15 respectively, thus realizing the structure of double friction plates 17, achieving better static friction performance, effectively increasing the contact area at the friction point of the clutch 11, and improving the transmission stability at the friction point.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety electric hoist comprising a drive motor (1) and a sprocket wheel (4), characterized in that: The driving motor (1) comprises a motor shaft (8), the motor shaft (8) is hollow and provided with an output shaft, the motor shaft (8) is provided with a clutch (11) connecting the two at one end of the output shaft, and the end of the output shaft away from the clutch (11) is provided with a brake (13) and is in transmission connection with a chain wheel (4).

2. A safety electric hoist according to claim 1, characterized in that: The output shaft and the chain wheel (4) are provided with a reducer (3) connecting the two.

3. A safety electric hoist according to claim 2, characterized in that: The output shaft comprises a motor output shaft (9) and a primary tooth shaft (10), one end of the primary tooth shaft (10) is in key connection with the motor output shaft (9), and the chain wheel (4) is provided with a through hole (12) for the primary tooth shaft (10) to pass through.

4. The safety electric hoist according to claim 1, characterized in that: The clutch (11) comprises a driving disc (14), a driven disc (15) and a spring, the driving disc (14) is connected to the motor shaft (8), the driven disc (15) is axially slidably connected to the output shaft, the driven disc (15) is in circumferential linkage with the output shaft, the spring drives the driven disc (15) to abut against the driving disc (14), and the output shaft end is threadedly connected with an adjusting nut (18) abutting against the spring.

5. A safety electric hoist according to claim 4, characterized in that: The output shaft is axially slidably connected with a secondary disc (31), the secondary disc (31) is located between the driven disc (15) and the driving disc (14), one side of the secondary disc (31) abuts against the driving disc (14), the other side abuts against the driven disc (15), and the two sides of the secondary disc (31) are provided with friction plates (17).

6. A safety electric hoist according to claim 4, characterized in that: The driving disc (14) is fixedly provided with a cooling fan (19), the cooling fan (19) is detachably connected with the driving disc (14), and the cooling fan (19) is externally provided with a fan cover (20).

7. A safety electric hoist according to claim 2, characterized in that: The reducer (3) comprises a gear box (22) and internal transmission gears, the output shaft has a worm part (27), the transmission gears comprise a double gear (23), a secondary driven gear (24), the double gear (23) has a first gear (25) meshing with the worm part (27), the secondary driven gear (24) is arranged on the chain wheel (4), and the double gear (23) has a second gear (26) meshing with the secondary driven gear (24).

8. A safety electric hoist according to claim 4, characterized in that: The spring is a butterfly spring (16).

9. A safety electric hoist according to claim 6, characterized in that: The cooling fan (19) extends with a connecting column (21), the connecting column (21) has a plurality of columns around the circumference, the connecting column (21) is hollow and provided with a screw, and the screw is connected and fixed with the driving disc (14).

10. The safety electric hoist according to claim 1, characterized in that: The chain wheel (4) is externally provided with a chain wheel box (2), the driving motor (1) comprises a motor shell (5), the motor shell (5) is fixed with the chain wheel box (2) through a screw, and the top of the chain wheel box (2) is provided with a hoisting part (29), and the hoisting part (29) is provided with a hoisting hole (30).

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