Double-hook electric hoist
By using a drive motor to drive the first chain and sprocket transmission to achieve synchronous movement of the second chain, the problems of high cost and large space occupation of double-hook electric hoists are solved, achieving the effect of low cost and small space occupation, and improving hoisting stability and chain service life.
Patent Information
- Application Number
- CN202520553535.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Existing double-hook electric hoists, due to their use of dual drive sprockets, are costly and space-consuming, making it difficult to meet the requirements of low cost and small space occupation.
The first chain is driven by a drive motor, and the second chain moves synchronously through sprocket transmission, reducing the cost of parts. The sprockets are arranged in the same plane, and guide sprockets and counterweights are added to ensure the chain is taut.
It reduces production costs, minimizes space occupation, and improves hoisting stability and chain lifespan, while avoiding recycling problems caused by chain slack.
Smart Images
Figure CN223792831U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric hoist technology, and in particular to a double-hook electric hoist. Background Technology
[0002] Electric hoists are a type of special lifting equipment, characterized by their small size, light weight, simple operation, and ease of use, and are widely used in the lifting field.
[0003] Because single-hook electric hoists are prone to tilting and swaying when lifting heavy objects, double-hook electric hoists have a significant advantage in lifting stability. Currently, most known double-hook electric hoists use the principle of lifting heavy objects at different points with two chains. However, both chains need to provide power, which requires the purchase of a special drive motor with dual drive sprockets. This motor is expensive, and the dual drive sprockets are generally arranged axially, and the two chains also need to be arranged in the same way as the dual drive sprockets, which increases the space occupied by the electric hoist along the motor axis.
[0004] Therefore, there is an urgent need for a low-cost, space-saving double-hook electric hoist. Utility Model Content
[0005] The purpose of this utility model is to provide a double-hook electric hoist to solve the problems existing in the prior art. The drive motor only drives the first chain to move, and the movement of the second chain relies on the transmission between the sprockets, which can reduce production costs. At the same time, the sprockets can be arranged in the same plane, reducing space occupation.
[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a double-hook electric hoist, including a drive motor, a first sprocket, a transmission sprocket, a second sprocket, a first chain, and a second chain. The drive motor is driven by the first sprocket and the first chain. The first chain is driven by the transmission sprocket. The transmission sprocket is synchronously driven by the second sprocket through a transmission mechanism. The second sprocket is driven by the second chain. The first sprocket, the transmission sprocket, and the second sprocket are located on the same plane. Hooks are provided at the ends of both the first chain and the second chain. The hooks of the first chain and the second chain are located on the same horizontal plane.
[0007] Preferably, the transmission mechanism includes a first gear and a second gear, the transmission sprocket is connected to the first gear, the second sprocket is connected to the second gear, and the first gear and the second gear mesh.
[0008] Preferably, the transmission sprocket is located below the drive motor, the first chain extends through a guide sprocket to the side of the second chain away from the drive motor, and the guide sprocket is located above the side of the transmission sprocket away from the drive motor.
[0009] Preferably, a counterweight is provided on the first chain, and the counterweight is located between the guide sprocket and the hook of the first chain.
[0010] Preferably, the double-hook electric hoist further includes a limit switch mechanism for limiting the maximum upward position of the first chain. The limit switch mechanism is located on the upward path of the counterweight, and both the limit switch mechanism and the drive motor are electrically connected to the control system.
[0011] Preferably, a spring is provided above the counterweight, and the counterweight abuts against the limit switch mechanism through the spring.
[0012] Preferably, the limit switch mechanism includes a rotating shaft, a cam, a limit switch, a limit rod, and a moving block. Limit rods are provided on both sides of the first chain. The moving block is slidably disposed on the limit rod along the length direction of the limit rod. A through hole for the first chain to move is provided in the middle of the moving block. The moving block is located on the movement path of the counterweight. The same side ends of the two limit rods are fixedly connected to the rotating shaft. The rotating shaft is connected to the cam. The push rod of the limit switch is located on the movement path of the protrusion of the cam.
[0013] Preferably, the double-hook electric hoist further includes a first chain bag and a second chain bag for holding the first chain and the second chain, respectively.
[0014] Preferably, both the first chain and the second chain are provided with guide members along their movement paths to guide the movement.
[0015] Preferably, the double-hook electric hoist also includes an outer shell for protection, and the top of the outer shell is provided with a mounting hole.
[0016] The present invention achieves the following main technical effects compared to the prior art:
[0017] Based on the use of a drive motor to drive the first chain, only an additional transmission sprocket, transmission mechanism, and second sprocket are needed. Compared with a special drive motor that uses dual drive sprockets, adding components can effectively reduce production costs. At the same time, the first sprocket, transmission sprocket, and second sprocket can be set on the same plane, effectively reducing the space occupied by the overall electric hoist.
[0018] The other solutions of this utility model achieve the following technical effects compared to the prior art:
[0019] The counterweight provides gravity to the lifting end of the first chain, ensuring that the chain remains taut during the recovery process when no heavy load is being lifted, preventing the chain from becoming clumped and unable to be recovered due to slack.
[0020] The spring can protect the limit switch mechanism and prevent the counterweight from directly and rigidly contacting the limit switch mechanism, which could cause damage. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of the double-hook electric hoist in the embodiment of this utility model;
[0023] Figure 2 This is a schematic diagram of the internal structure of the double-hook electric hoist in an embodiment of this utility model;
[0024] Figure 3 This is a front view of the internal structure of the double-hook electric hoist in an embodiment of this utility model;
[0025] Figure 4 This is a rear view of the double-hook electric hoist with its protective cover concealed in an embodiment of the present invention.
[0026] Figure 5 This is a cross-sectional view of the counterweight block in an embodiment of this utility model;
[0027] Figure 6 This is an enlarged view of the limit switch structure in an embodiment of this utility model;
[0028] Figure 7 This is a schematic diagram illustrating the motion coordination between the cam and the limit switch inside the housing in an embodiment of this utility model.
[0029] The components include: 1. Drive motor; 2. First sprocket; 3. Second sprocket; 4. First chain; 5. Second chain; 6. Transmission sprocket; 7. First gear; 8. Second gear; 9. Hook; 10. Guide sprocket; 11. Counterweight; 12. Spring; 13. Semicircular locking block; 14. Limit switch mechanism; 15. Rotating shaft; 16. Cam; 17. Limit switch; 18. Limit rod; 19. Moving block; 20. Through hole; 21. Inclined baffle; 22. Box body; 23. First chain bag; 24. Second chain bag; 25. Guide component; 26. Outer shell; 27. Mounting hole; 28. Protective cover. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] The purpose of this utility model is to provide a double-hook electric hoist to solve the problems existing in the prior art. The drive motor only drives the first chain to move, and the movement of the second chain relies on the transmission between the sprockets, which can reduce production costs. At the same time, the sprockets can be arranged in the same plane, reducing space occupation.
[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] Please refer to the following: Figures 1 to 7As shown, a double-hook electric hoist is provided, including a drive motor 1, a first sprocket 2, a transmission sprocket 6, a second sprocket 3, a first chain 4, and a second chain 5. The first sprocket 2 is connected to the output shaft of the drive motor 1 through a reduction mechanism. The first chain 4 is mounted on the first sprocket 2. The drive motor 1 is driven by the first chain 4 through the first sprocket 2. The transmission sprocket 6 is positioned on the movement path of the first chain 4, and the first chain 4 is driven by the transmission sprocket 6. The transmission sprocket 6 is synchronously driven by the second sprocket 3 through a transmission mechanism. The second sprocket 3 is driven by the second chain 5. Based on the drive motor 1 driving the first chain 4, only additional... Synchronous movement of the second chain 5 can be achieved by adding low-cost components such as the transmission sprocket 6, the transmission mechanism, and the second sprocket 3. Compared with a special drive motor using dual drive sprockets, adding components can effectively reduce production costs. At the same time, setting the first sprocket 2, the transmission sprocket 6, and the second sprocket 3 on the same plane can effectively reduce the space occupied by the electric hoist compared with the electric hoist using dual drive sprockets. Hooks 9 are provided at the ends of the first chain 4 and the second chain 5. The hooks 9 of the first chain 4 and the second chain 5 are located on the same horizontal plane, which is used to lift the heavy object from two points and ensure the stability of the heavy object during the lifting process.
[0034] In this embodiment, the transmission mechanism includes a first gear 7 and a second gear 8. The transmission sprocket 6 is connected to the first gear 7, and the second sprocket 3 is connected to the second gear 8. The first gear 7 and the second gear 8 mesh to achieve transmission. In other embodiments, belt drive, chain drive, or other methods can also be used to achieve synchronous transmission between the transmission sprocket 6 and the second sprocket 3.
[0035] Since the heavy object needs to be lifted from two points, meaning that one of the first chain 4 and the second chain 5 needs to be longer, in this embodiment, the first chain 4, which is directly driven by the drive motor 1, is selected as the longer chain. The first chain 4 extends to the side of the second chain 5 away from the drive motor 1 through the guide sprocket 10. A shorter chain can be used to match the driven second sprocket 3, so as to reduce the influence of the chain's weight on the transmission mechanism between the second sprocket 3 and the first sprocket 2 and improve its service life. At the same time, the transmission sprocket 6 is set below the drive motor 1 (either directly below or to the side below), and the guide sprocket 10 is set above the side of the transmission sprocket 6 away from the drive motor 1. This increases the contact length between the chain and the first sprocket 2 and the transmission sprocket 6, thereby improving the transmission effect.
[0036] In this embodiment, two horizontally arranged guide sprockets 10 are provided above the side of the transmission sprocket 6; in other embodiments, other numbers (including one) of guide sprockets 10 may be provided above the side of the transmission sprocket 6. When the number of guide sprockets 10 is greater than one, the multiple guide sprockets 10 are arranged sequentially in the horizontal direction. The increase in the number of guide sprockets 10 can correspondingly extend the distance between the hook 9 of the first chain 4 and the hook 9 of the second chain 5.
[0037] Since the guide sprocket 10 is located above and to the side of the drive sprocket 6, the chain is prone to slippage and clumping due to gravity during retrieval. Therefore, a counterweight 11 is provided on the first chain 4. The counterweight 11 is located between the guide sprocket 10 and the hook 9 of the first chain 4. When multiple guide sprockets 10 are provided, the counterweight 11 is located between the guide sprocket 10 furthest from the drive motor 1 and the hook 9 of the first chain 4. By providing the counterweight 11, gravity can be provided to the lifting end of the first chain 4, ensuring that the chain is taut during retrieval without a load, and preventing the chain from clumping and becoming unrecoverable due to slack.
[0038] In this embodiment, the counterweight 11 is detachably mounted on the first chain 4, allowing for position adjustment. Specifically, the counterweight 11 has a central hole in its center for the first chain 4 to pass through. Two semi-circular locking blocks 13 are respectively positioned on either side of the first chain 4 and connected by bolts. As the bolts are tightened, the pressure between the semi-circular locking blocks 13 and the first chain 4 increases, thus securing the semi-circular locking blocks 13 onto the first chain 4. The bottom of the counterweight 11 has a groove that matches the shape of the connected semi-circular locking blocks 13. The two semi-circular locking blocks 13 are embedded in the groove, thereby supporting the chain. The counterweight 11 is supported. The specific disassembly and assembly steps are as follows: During the installation of the counterweight 11, before installing the hook 9, the counterweight 11 should be inserted into the first chain 4, and then the two semi-circular clips 13 and the hook 9 should be connected. After the two semi-circular clips 13 are connected, they can be directly embedded into the groove at the bottom of the counterweight 11. When disassembling the counterweight 11, the hook 9 should be removed first, and the two semi-circular clips 13 should be removed from the counterweight 11. After they are removed, the two semi-circular clips 13 should be disassembled, and finally the counterweight 11 can be taken out along the first chain 4. In other embodiments, the counterweight 11 can also be integrally formed on the first chain 4 during the production process.
[0039] The double-hook electric hoist in this embodiment also includes a limit switch mechanism 14, which is used to limit the maximum rising position of the first chain 4. The limit switch mechanism 14 is located on the rising path of the counterweight 11. The limit switch mechanism 14 and the drive motor 1 are both electrically connected to the control system. When the counterweight 11 moves to the limit switch mechanism 14, the control system controls the drive motor 1 to stop to prevent the chain from being over-retracted.
[0040] A spring 12 is provided above the counterweight 11. The counterweight 11 abuts against the limit switch mechanism 14 through the spring 12. The spring 12 can protect the limit switch mechanism 14 and prevent the counterweight 11 from directly and rigidly contacting the limit switch mechanism 14, which would cause damage to it.
[0041] In this embodiment, the limit switch mechanism 14 includes a rotating shaft 15, a cam 16, a limit switch 17, a limit rod 18, and a moving block 19. Limit rods 18 are provided on both sides of the first chain 4. The moving block 19 is slidably mounted on the limit rod 18 along its length. A through hole 20 for the first chain 4 to move is provided in the middle of the moving block 19. The through hole 20 is a cross-shaped through hole that matches the first chain 4. The moving block 19 is located on the movement path of the counterweight 11 (when the counterweight 11 is equipped with a spring 12, the moving block 19 is located on the movement path of the spring 12). On the moving path), the same side ends of the two limit rods 18 are fixedly connected to the rotating shaft 15. The rotating shaft 15 is rotatably mounted on the outer shell 26 of the electric hoist. The rotating shaft 15 is connected to the cam 16. The push rod of the limit switch 17 is located on the moving path of the protrusion of the cam 16. The limiting principle is as follows: after the counterweight 11 or the spring 12 rises and abuts against the moving block 19, the limit rod 18 will rotate around the rotating shaft 15, thereby using the rotating shaft 15 to drive the cam 16 to move, and then using the protrusion of the cam 16 to move to the push rod to push the push rod of the limit switch 17.
[0042] Alternatively, a slanted baffle 21 can be set between the push rod and the cam 16. The slanted baffle 21 is connected to the main body of the limit switch 17 through a torsion spring. In the initial state, the slanted baffle 21 does not contact the push rod. When the cam 16 moves, its protrusion squeezes the slanted baffle 21, thereby pushing the push rod. The slanted baffle 21 can protect the push rod.
[0043] Cam 16 and limit switch 17 can be separately installed in housing 22 to improve the protection of limit switch 17.
[0044] In other embodiments, the travel switch 17 can also be directly used as the limit switch mechanism 14 and directly set on the movement path of the counterweight 11 or the spring 12.
[0045] Based on the aforementioned limiting principle and corresponding structure, a block structure can also be set on the first chain 4 on the feeding side of the drive motor 1. A spring 12 can also be set on the block structure, and a limit switch mechanism 14 can also be set on the feeding side of the drive motor 1 to limit the maximum descent position of the first chain 4.
[0046] The double-hook electric hoist also includes a first chain bag 23 and a second chain bag 24 for holding the first chain 4 and the second chain 5 respectively, so as to collect the first chain 4 and the second chain 5 separately and prevent them from getting tangled or knotted when collected in the same chain bag.
[0047] To ensure the stable movement of the first chain 4 and the second chain 5, guide members 25 are provided on the movement paths of the first chain 4 and the second chain 5 to guide the movement of the chains. The guide members 25 can be rotating wheel-shaped structures or fixed block structures with arc-shaped surfaces, etc., which are designed to restrict and guide the chains from the side. The arc-shaped surfaces of the block structures are provided corresponding to the chains.
[0048] Specifically, in this embodiment, guide members 25 are provided on both sides of the transmission sprocket 6, both sides of the second sprocket 3, the side of the guide sprocket 10, and below the first chain 4 between the two guide sprockets 10. In other embodiments, any number of guide members 25 can be provided in other locations.
[0049] The double-hook electric hoist also includes an outer shell 26 for protection. In this embodiment, the outer shell 26 includes two parallel flat plates to protect the middle sprocket, chain, and guide 25 from both sides. The top of the outer shell 26 is provided with mounting holes 27, which can be used to position the electric hoist. Multiple mounting holes 27 can be provided and evenly distributed on the top of the outer shell 26.
[0050] In this embodiment, the drive motor 1, the first chain bag 23, the second chain bag 24, the transmission sprocket 6, the second sprocket 3, the guide sprocket 10, the guide member 25, and the limit switch mechanism 14 are all mounted on the outer shell 26. The transmission mechanism is located outside the outer shell 26 and is protected by a protective cover 28.
[0051] In actual use, the two hooks 9 of the first chain 4 and the second chain 5 are respectively hoisted onto two points of the heavy object. The drive motor 1 is started. The drive motor 1 drives the first chain 4 to rise. At the same time, the second sprocket 3 receives the power transmitted by the transmission sprocket 6 and drives the second chain 5 to rise, so as to realize the synchronous movement of the first chain 4 and the second chain 5.
[0052] Any adaptive changes made according to actual needs are within the protection scope of this utility model.
[0053] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0054] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A double-hook electric hoist, characterized in that, The double-hook electric hoist comprises a driving motor, a first sprocket, a transmission sprocket, a second sprocket, a first chain and a second chain, the driving motor is in transmission connection with the first sprocket through the first sprocket, the first sprocket is in transmission connection with the transmission sprocket, the transmission sprocket is in synchronous transmission with the second sprocket through a transmission mechanism, the second sprocket is in transmission connection with the second chain, the first sprocket, the transmission sprocket and the second sprocket are located on the same plane, the first chain and the second chain are both provided with hooks at the ends, and the hooks of the first chain and the second chain are located on the same horizontal plane.
2. Double hook electric hoist according to claim 1, characterized in that The transmission mechanism comprises a first gear and a second gear, the transmission sprocket is connected with the first gear, the second sprocket is connected with the second gear, and the first gear is in meshing connection with the second gear.
3. The double-hook electric hoist according to claim 1, characterized in that, The transmission sprocket is located below the driving motor, the first chain extends to the side of the second chain away from the driving motor through a guide sprocket, and the guide sprocket is located above the side of the transmission sprocket away from the driving motor.
4. A double hook electric hoist according to claim 3, characterised in that, A counterweight is arranged on the first chain and located between the guide sprocket and the hook of the first chain.
5. A double hook electric hoist according to claim 4, characterised in that, The double-hook electric hoist further comprises a limit switch mechanism for limiting the maximum lifting position of the first chain, the limit switch mechanism is located on the lifting path of the counterweight, and the limit switch mechanism and the driving motor are both in electrical connection with a control system.
6. A double hook electric hoist according to claim 5, characterised in that, A spring is arranged above the counterweight, and the counterweight abuts against the limit switch mechanism through the spring.
7. A double hook electric hoist according to claim 5, characterized in that, The limit switch mechanism comprises a rotating shaft, a cam, a travel switch, a limiting rod and a moving block, the limiting rods are arranged on both sides of the first chain, the moving block is slidably arranged on the limiting rods in the length direction of the limiting rods, the moving block is provided with a through hole for the movement of the first chain in the middle part, the moving block is located on the movement path of the counterweight, the same side ends of the two limiting rods are fixedly connected with the rotating shaft, the rotating shaft is connected with the cam, and the push rod of the travel switch is located on the movement path of the protruding part of the cam.
8. The double-hook electric hoist according to claim 1, characterized in that, The double-hook electric hoist further comprises a first chain bag and a second chain bag for containing the first chain and the second chain respectively.
9. The double-hook electric hoist according to claim 1, characterized in that, The movement paths of the first chain and the second chain are both provided with guide members for guiding the movement.
10. The double-hook electric hoist according to claim 1, characterized in that, The double-hook electric hoist further comprises an outer shell for protection, and the outer shell is provided with a mounting hole at the top.