Lifting device

Abstract

The utility model discloses a lifting device which comprises a first winding and unwinding mechanism, a second winding and unwinding mechanism and a belt mechanism, and the first winding and unwinding mechanism comprises a first shaft and a first wheel arranged on the first shaft. The second retracting and releasing mechanism comprises a second shaft, a second wheel arranged on the second shaft and a driving assembly. The driving assembly comprises an elastic piece used for elastically driving the second wheel to rotate. The belt mechanism comprises a belt, one end of the belt is wound on the second wheel, the other end of the belt is wound around the first wheel and then connected with the lifting part, when the first wheel drives the belt to lift the lifting part, the elastic part drives the second wheel to wind the lifted belt, and when the first wheel drives the belt to descend the lifting part, the second wheel overcomes the elasticity of the elastic part through the belt to release the belt. According to the lifting device, the two different winding and unwinding mechanisms are arranged, one winding and unwinding mechanism is used for lifting the belt, the other winding and unwinding mechanism is used for winding / unwinding the belt, and the two winding and unwinding mechanisms are matched so that the lifting piece can stably ascend and descend at a constant speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of semiconductor processing equipment, especially to a lifting device. BACKGROUND

[0002] In the processing of semiconductor, the wafer box loaded with semiconductor is carried by automatic material handling system. The automatic material handling system (AMHS) is mainly composed of working track, overhead travelling crane (OHT) and control system. The overhead travelling crane can travel along the working track and accurately carry the wafer box to the destination such as process machine table under the control of the control system. When the overhead travelling crane is installed on the working track, the overhead travelling crane needs to be installed on the lifting track first, and then the lifting device is used to lift the lifting track and the overhead travelling crane on the lifting track. When the lifting track is lifted to the same height as the working track of the overhead travelling crane and the connection is completed, the overhead travelling crane enters the working track from the lifting track. In this process, how to stably and reliably lift the lifting track and the overhead travelling crane on the lifting track is a problem to be solved urgently. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the utility model discloses a lifting device, two different winding and unwinding mechanisms are arranged, one of the winding and unwinding mechanisms is used for lifting the belt, and the other winding and unwinding mechanism is used for winding / unwinding the belt, and the two winding and unwinding mechanisms cooperate to enable the lifting piece to be lifted uniformly and stably.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme of a lifting device, which comprises:

[0005] The first winding and unwinding mechanism comprises a first shaft and a first wheel arranged on the first shaft;

[0006] The second winding and unwinding mechanism comprises a second shaft, a second wheel arranged on the second shaft and a driving assembly, the driving assembly comprises an elastic member for elastically driving the second wheel to rotate;

[0007] The belt mechanism comprises a belt wound on the second wheel at one end and connected with the lifting piece after winding around the first wheel, when the first wheel drives the belt to lift the lifting piece, the elastic member drives the second wheel to wind the lifted belt, and when the first wheel drives the belt to lower the lifting piece, the second wheel releases the belt through the belt to overcome the elastic force of the elastic member.

[0008] Further, the driving assembly has two, and the two driving assemblies are respectively located at two ends of the second shaft.

[0009] Further, the second wheel and the belt are one-to-one corresponding multiple, and the multiple second wheels are arranged on the second shaft in the axial direction.

[0010] Further, the second shaft has multiple, and the multiple second shafts are arranged in the axial direction, and one or more second wheels are arranged on each second shaft.

[0011] Further, the sensor corresponding to the second shaft is further included, and the sensor is used for detecting whether the belt between the first wheel and the second wheel is sagged.

[0012] Further, the first take-up mechanism further includes a first driving member and a worm gear transmission assembly, and the first driving member drives the first wheel to rotate through the worm gear transmission assembly.

[0013] Further, the elastic member is a coil spring or a torsion spring.

[0014] Further, the driving assembly further includes a housing, the elastic member is a coil spring, the coil spring is located in the housing, one end of the second shaft is inserted into the housing and is rotationally connected with the housing, an outer ring end of the coil spring is fixedly connected with the housing, and an inner ring end of the coil spring is fixed with the second shaft.

[0015] Further, the housing includes a box body and a cover, the box body and the cover define a closed cavity for placing the coil spring, a first hole for the second shaft to pass through is formed in a box bottom of the box body, and a second hole for the outer ring end of the coil spring to pass through is formed in a box wall of the box body.

[0016] Further, the belt mechanism further includes a third wheel located between the first wheel and the second wheel, and the belt passes through between the first wheel and the third wheel, and the third wheel is used for limiting the belt from being separated from the first wheel. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a perspective view of a lifting device according to an embodiment of the present application;

[0018] Figure 2 Fig. 2 is a top view of the lifting device according to the embodiment of the present application;

[0019] Figure 3 Fig. 3 is a perspective view of a driving assembly separated from a cover according to the embodiment of the present application;

[0020] Figure 4 Fig. 4 is another perspective view of the lifting device according to the embodiment of the present application;

[0021] Figure 5 Fig. 5 is a perspective view of a second take-up mechanism according to another embodiment of the present application.

[0022] In the drawings:

[0023] 1, a first take-up mechanism;

[0024] 11, a first shaft; 12, a first wheel; 13, a first driving member; 14, a worm gear transmission assembly;

[0025] 2, a second take-up mechanism;

[0026] 21. Second shaft; 22. Second wheel; 23. Drive assembly; 231. Coil spring; 2311. Inner ring end; 2312. Outer ring end; 232. Housing; 2321. Box body; 23211. First hole; 23212. Second hole; 2322. Cover; 233. Pressure block; 234. Mounting base;

[0027] 3. With mechanism;

[0028] 31. With; 32. Third round; 33. Fourth round; 34. Fifth round;

[0029] 4. Testing mechanism; 41. Sensor; 42. Connecting plate. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0031] Lifting devices typically include a winding and unwinding mechanism and a belt. The belt connects the winding and unwinding mechanism and the lifting component. The winding and unwinding mechanism is used to wind / release the belt to lift / lower the lifting component.

[0032] Existing technology uses only one winding / unwinding mechanism, which simultaneously winds / unwinds the belt and raises / lowers the lifting component. This mechanism typically includes a drive unit (such as a motor) and a rotating shaft. One end of the belt is fixed to this shaft. When the motor drives the shaft to rotate at a fixed speed, it winds / unwinds the belt, thereby raising / lowering the lifting component. As the belt diameter increases during winding, the lifting component is raised faster and faster; conversely, as the belt diameter decreases during unwinding, the lifting component descends slower and slower. Therefore, when the motor winds / unwinds the belt at a fixed speed, the lifting component cannot move at a uniform speed, resulting in an unstable state. Simultaneously, the belt is subjected to the impact of forces caused by speed changes, accelerating belt damage and affecting its service life.

[0033] Therefore, this utility model proposes a lifting device, see attached figure. Figure 1 Appendix Figure 2 and attached Figure 4 As shown, it includes a first retracting mechanism, a second retracting mechanism, and a belt mechanism.

[0034] The belt mechanism comprises a belt, the first take-up and pay-off mechanism comprises a first shaft and a first wheel arranged on the first shaft, the first shaft is rotatable along its own axis and drives the belt to move through the first wheel during rotation. The second take-up and pay-off mechanism comprises a second shaft, a second wheel arranged on the second shaft and a driving assembly, the second shaft is parallel to the first shaft and rotatable along its own axis, and the driving assembly comprises an elastic member for elastically driving the second wheel to rotate. One end of the belt is wound on the second wheel and the other end is connected to the lifting member after passing through the first wheel, and the belt can drive the lifting member to lift during movement. When the first wheel drives the belt to lift the lifting member, the elastic member drives the second wheel to wind the lifted belt; when the first wheel drives the belt to lower the lifting member, the second wheel releases the belt by overcoming the elastic force of the elastic member through the belt.

[0035] In the embodiment, two different take-up and pay-off mechanisms are provided, and the lifting action of the belt and the winding / release action of the belt are performed separately. The first wheel of the first take-up and pay-off mechanism provides power for the movement of the belt to lift or lower the belt, and the first wheel only drives the belt and does not wind the belt, so the diameter of the belt on the first wheel does not change, and when the first shaft rotates at a constant speed, the lifting member lifted or lowered by the belt through the first wheel is also at a constant speed. The elastic member has a preloaded elastic force that can provide a force to the second shaft to rotate in the direction of winding the belt in real time, and this elastic force rotates the second shaft and the second wheel to wind the lifted belt, so that the belt does not sag and interfere with other components. When the first wheel drives the belt to lower the lifting member, the second wheel can overcome the elasticity of the elastic member to release the belt wound thereon in real time through the pulling of the belt, so that the belt is not easily torn.

[0036] The first wheel of the first take-up and pay-off mechanism can precisely control the lifting or lowering stroke of the belt through uniform rotation, thereby facilitating precise control of the lifting distance of the lifting member. The second wheel of the second take-up and pay-off mechanism winds the belt passing through the first wheel when the first wheel lifts the belt; when the first wheel lowers the belt, the force exerted on the belt by the first wheel is opposite to the force exerted on the belt by the elastic member through the second wheel, and the second wheel can release the belt by overcoming the elastic force of the elastic member, thereby meeting the requirement of uniform lifting of the lifting member.

[0037] The lifting member comprises a lifting track, and the lifting track carries the hoist to lift at a constant speed, so that the hoist is not easy to sway on the lifting track and is in a stable state, and the hoist is not easy to fall, thereby improving the safety of the lifting member during lifting.

[0038] When the lifting member is lifted, the first shaft rotates at a constant speed under the drive of the first driving member, the first wheel installed on the first shaft rotates accordingly, and the belt is lifted, at the same time, the elastic member, due to the pre-tightening, always applies a force to the second shaft in the direction of winding, and the second wheel winds the belt lifted by the first wheel. When the lifting member is lowered, the first shaft rotates in the opposite direction at a constant speed under the drive of the first driving member, the first wheel installed on the first shaft rotates accordingly, and the belt is pulled down at a constant speed, at this time, the second wheel can overcome the elastic force of the elastic member to gradually release the belt wound thereon, and the elastic member gradually stores energy in this process until the lifting member is lowered to the predetermined position, the force applied to the belt by the elastic force is always insufficient to wind the belt in this process, and the second wheel remains in the state of releasing the belt.

[0039] In one embodiment, referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 5 , the driving assembly has two, and the two driving assemblies are located at the two ends of the second shaft. At this time, one second shaft is provided with a force in the direction of winding by the two driving assemblies, and the two driving assemblies can provide redundancy protection relative to one driving assembly.

[0040] When only one driving assembly is provided, the driving assembly fails and cannot wind, and the belt between the first wheel and the second wheel will sag, at this time, the first wheel may not be able to well contact the belt, and thus cannot drive the belt to move, and the lifting member connected to the belt has the risk of falling. In the present embodiment, two driving assemblies are provided, when one driving assembly fails, the other driving assembly can still be used to provide a force in the direction of winding for the second shaft, so that the belt between the first wheel and the second wheel is tensioned, at this time, the belt is not easy to be loosened on the first wheel, and sudden falling of the lifting member is avoided.

[0041] In one embodiment, the belt is a toothed belt, and the first wheel is a gear at this time, the toothed belt and the gear are engaged, and the toothed belt is driven to move. The cooperation structure of the toothed belt and the gear can reduce the slippage between the belt and the first wheel, and the first wheel can more stably and uniformly drive the belt to move, so that the lifting of the lifting member is more stable and safe.

[0042] Referring to the accompanying drawings Figure 2 , the first winding and unwinding mechanism includes a first driving member, which can be a motor, and the first driving member is used to drive the first shaft to rotate.

[0043] In one embodiment, the first winding and unwinding mechanism further comprises a worm gear transmission assembly, the first driving member drives the first wheel to rotate through the worm gear transmission assembly. The worm gear transmission assembly has a self-locking function, at this time when the power is abnormally cut off, the first driving member is in a power-off state, the first driving member cannot actively provide tension to the belt, but because the worm gear transmission assembly has a self-locking function, the first shaft can be locked and fixed, and the belt is stationary on the first wheel, and the lifting member connected with the belt will not fall, which can avoid the lifting member from falling due to its own weight.

[0044] At the same time, the elastic member always provides a force to the second shaft to rotate in the direction of winding the belt, and the elastic member is always in a force storage state during use. Therefore, during installation of the lifting device, the elastic member needs to be preloaded with an elastic force. At this time, the added worm gear transmission assembly can lock the first shaft, so that the first shaft and the first wheel thereon are fixed and the belt is locked, thereby keeping the elastic member in a preloaded state and achieving installation of the lifting device.

[0045] Referring to FIG. 1, Figure 4 As shown in the drawings, the belt mechanism further comprises a third wheel located between the first wheel and the second wheel, the belt passes between the first wheel and the third wheel, and the third wheel is used to limit the belt from separating from the first wheel. The third wheel is a driven member and can rotate along its own axis under the drive of the belt. The third wheel and the first wheel are correspondingly arranged and parallel. Through the arrangement of the third wheel, the belt can be prevented from separating from the first wheel, and the belt can be wrapped around the first wheel.

[0046] The driving assembly may have problems, causing the belt lifted by the first wheel to not be wound in time, and the belt between the first wheel and the second wheel may be loose at this time. If there is no third wheel, the belt near the second wheel on the first wheel may separate from the first wheel, and the included angle between the first wheel and the belt is reduced. If the belt is a toothed belt, only a few teeth may be engaged, the stress of the teeth is large, and the service life is short. If the belt is not a toothed belt, the contact area of the belt is reduced after being lifted by the first wheel through friction, and the maximum friction between the first wheel and the belt is also reduced, which may cause the first wheel to slip and cause the first wheel to be unable to uniformly lift the lifting member through the belt. Therefore, in this embodiment, the third wheel is added, the third wheel and the first wheel are correspondingly arranged, and the belt passes between the first wheel and the third wheel and is fixed to the second wheel. Even if the belt between the first wheel and the third wheel is loose, the third wheel will limit the position of the belt, so that the belt is always in contact with the first wheel, and the belt and the first wheel are prevented from separating. Therefore, the first wheel can always drive the belt to move to uniformly lift the lifting member.

[0047] Referring to FIG. 1, Figure 4 As shown in the drawings, the belt mechanism further comprises a fourth wheel and a fifth wheel, both of which are correspondingly arranged with the first wheel and parallel to the first wheel.

[0048] The fourth wheel is located on the side of the first wheel away from the second wheel and below the first wheel. The belt is wound on the second wheel after passing through the first wheel and the fourth wheel. The fourth wheel makes the angle of the belt on the first wheel larger, so that the belt can engage more teeth of the first wheel when the first wheel drives the belt through gear engagement, thereby reducing the alternating force on the single tooth of the belt and prolonging the service life of the belt. Or when the first wheel drives the belt through friction, the contact area between the first wheel and the belt is larger, and the friction between them is larger, which facilitates the transmission of the first wheel to the belt.

[0049] The fifth wheel is used for the turning of the belt. As shown in the accompanying drawings, the fifth wheel is located in front of the first wheel and directly above the lifting member. The horizontal belt on the first wheel can be guided by the fifth wheel and then connected to the lifting member in the vertical direction. Figure 4

[0050] In order to improve the stability of the lifting member, a plurality of belts are usually provided, which are connected to the lifting member and simultaneously lift the lifting member. At this time, the second wheel and the first wheel are each one-to-one corresponding to the plurality of belts, and each belt is wound on the corresponding second wheel. The plurality of second wheels are spaced apart along the axial direction of the second shaft and arranged on the second shaft.

[0051] Exemplarily, as shown in the accompanying drawings, four belts are provided, and four second wheels are also provided. Figure 1

[0052] The second shaft can be one, and the plurality of second wheels are fixed on the second shaft, but at this time all the belts are wound by the two drive assemblies.

[0053] In order to improve safety, the second shaft has a plurality of second shafts, and the plurality of second shafts are spaced apart along the axial direction thereof, and each second shaft is provided with one or more second wheels. Different belts can be wound / unwound by the second wheels on different second shafts. Even if the drive assemblies at both ends of a second shaft are abnormal and cannot normally wind the belt, other second shafts can still complete the winding / unwinding of the belt. At this time, even if the belt between the abnormal drive assembly and the corresponding first wheel sags to cause the belt and the corresponding first wheel to not be in good contact, so that this first wheel cannot limit the position of the corresponding belt, other second shafts can still normally wind the belt, that is, there is still a belt that is limited in position by the corresponding first wheel, and the lifting member is not easy to fall, thereby improving safety.

[0054] Exemplarily, as shown in the accompanying drawings, four belts are provided, and two second shafts are provided, and each second shaft is provided with two second wheels. At this time, one second shaft is used for winding / unwinding two belts. Figure 2 Figure 5 As shown in the accompanying drawings, one second wheel can be fixed on one second shaft.

[0055] ​​​The lifting device comprises a mounting plate (not shown in the figure) fixed to the roof. The mounting plate is used to connect various components of the lifting device, and the lifting device can be hoisted as a whole.

[0056] In one embodiment, the elastic member is a coil spring, which comprises an inner end and an outer end. The inner end is fixed to the second shaft to rotate synchronously with the second shaft, and the outer end is fixed. When the second shaft rotates, the coil spring can be charged through the inner end.

[0057] Referring to the accompanying Figure 3 As shown, the drive assembly further comprises a housing, the coil spring is located in the housing, one end of the second shaft is inserted into the housing and is rotatably connected to the housing, the outer end of the coil spring is fixedly connected to the housing, and the inner end of the coil spring is fixed to the second shaft. The housing is fixed to the mounting plate, and the housing is fixed. Therefore, the outer end is fixed, and the inner end can move with the rotation of the second shaft to achieve the energy storage of the coil spring. The coil spring is arranged in the housing, which can effectively protect the coil spring and facilitate the installation of the coil spring.

[0058] The housing comprises a box body and a cover, and the box body and the cover define a closed cavity for placing the coil spring. The box bottom of the box body is provided with a first hole for the second shaft end to pass through, and the box wall of the box body is provided with a second hole for the outer end of the coil spring to pass through. On the one hand, the closed cavity can prevent the coil spring from jumping out of the housing, and on the other hand, the open structure is easy to accumulate dust, and the coil spring winding action is easy to pop out the dust and pollute the wafer factory with high cleanliness requirements.

[0059] The second hole is open to one side of the opening of the box wall, which facilitates the entry and exit of the outer end of the coil spring. The second shaft is provided with a fixing groove along its own axis from its end face, and the inner end is inserted into the fixing groove from the opening of the fixing groove and fixed to the second shaft by a locking member (such as a bolt). The box body is detachably connected with a mounting seat and a pressing block. The box body is fixedly connected with the mounting plate through the mounting seat, and the pressing block presses the outer end on the box body to realize the fixation of the box body and the outer end. When the coil spring needs to be replaced, the pressing block is removed to release the fixation of the outer end and the housing, and then the locking member is unscrewed. At this time, the coil spring, the second shaft and the box body are no longer fixed, and the coil spring can be taken out from the opening of the box body.

[0060] In one embodiment, the elastic member is a torsion spring, one end of the torsion spring is fixed to the second shaft, and the other end is fixed to the housing. At this time, when the second shaft rotates, the torsion spring can also be charged, and the torsion spring can also be charged when the second shaft rotates to release the belt, and the second shaft can be driven to rotate to wind the belt.

[0061] Referring to the accompanying Figure 1 As shown, the lifting device further comprises a detection mechanism, which comprises a sensor corresponding to the second shaft. The sensor is used to detect whether the belt between the first wheel and the second wheel is sagging.

[0062] The elasticity of the elastic member may weaken over time, which causes the lifting member to not reach the top end when being lifted, and the elastic member to not have the elasticity to rotate the second shaft. At this time, the belt between the first wheel and the second wheel cannot be wound on the second wheel, causing the belt to sag between the first wheel and the second wheel. The sagging belt may interfere with other components. The sensor can detect the sagging belt and send a signal when the belt between the first wheel and the second wheel sags, reminding the user to replace the elastic member. The sensor corresponds to the second shaft, that is, whether the elasticity of the elastic member of the driving assembly at both ends of the second shaft meets the winding requirement.

[0063] For example, the sensor is an optical proximity sensor. When the elasticity of the elastic member is not weakened, the belt between the first wheel and the second wheel does not sag, and the light of the optical proximity sensor is not blocked at this time. When the elasticity of the elastic member is weakened, the belt between the first wheel and the second wheel sags, specifically below the third wheel, and the light of the optical proximity sensor is blocked. The optical proximity sensor outputs an electrical signal after receiving the reflected light signal, and the controller determines that the elasticity of the elastic member is insufficient after receiving the electrical signal.

[0064] The sensor is fixed on the connecting plate, and the connecting plate is fixed with the mounting plate.

[0065] In one embodiment, a mounting method of the lifting device is also disclosed, which is used to mount the above-mentioned lifting device and realize the butt joint of the lifting track of the lifting member and the fixed track in the air. The mounting method comprises an elastic member pre-tightening mounting step and a lifting member mounting step.

[0066] The elastic member pre-tightening mounting step realizes the pre-tightening mounting of the elastic member, and specifically comprises:

[0067] S1, fixing the outer ring end of the elastic member to the housing, connecting the inner ring end of the elastic member to the second shaft, and setting the second shaft to a free state.

[0068] The free state of the second shaft is that the elastic member releases energy, and the second shaft rotates under the action of the elasticity of the elastic member until the inner ring end of the elastic member no longer rotates. At this time, the elastic member has no power storage and is also in a free state.

[0069] S2, winding one end of the belt on the second wheel and fixing the one end of the belt to the second wheel, and disconnecting the other end of the belt from the lifting member (suspended).

[0070] The direction in which the belt is wound on the second wheel is opposite to the direction in which the inner ring end of the elastic member releases energy and rotates, that is, opposite to the direction in which the second shaft winds the belt. The length of the belt wound on the second wheel is not less than the lifting height of the lifting member from the bottom end to the top end, so that the elastic member continues to store power when the lifting member descends.

[0071] S3. Rotate the second axis a predetermined number of times in the opposite direction to the rotation of the inner ring end of the elastic element, which is the direction in which energy is released.

[0072] In this step, the elastic element is pre-tensioned by rotating the second shaft, ensuring that it retains its elasticity even when the lifting member is raised to the top. Pre-loading the elastic element prevents it from becoming too elastic over time, which could cause the belt to fail to wind up in the second pass when the lifting member is about to be raised to the top.

[0073] The number of laps is set manually and should not be too large; the number of laps is generally one to two laps.

[0074] S4. Pass the other end of the belt around the first wheel and lock the first wheel on the first shaft through the worm gear transmission assembly.

[0075] At this time, because the first winding and unwinding mechanism includes a worm gear transmission assembly, which has a self-locking function, it can keep the first shaft stationary when the first driving component is working, thereby locking the belt and maintaining the preloaded elastic force of the elastic component.

[0076] Through steps S1-S4, the elastic element is pre-tightened. During this process, the belt is not connected to the lifting component and therefore will not be pulled by the weight of the lifting component, making the belt less prone to damage. Furthermore, these steps can be performed at a low position, facilitating operation.

[0077] The installation steps for the lifting component are used to connect the lifting component to the belt and to lift the component, and specifically include:

[0078] S5. Raise the suspension lifting device to the predetermined height position.

[0079] After step S5, the mounting plate of the lifting device reaches the specified installation height, which is the working height. The lifting device will then lift the lifting component at this height.

[0080] S6. The first driving component drives the first shaft to rotate, causing the suspended end of the belt on the first wheel to gradually descend until the suspended end of the belt descends to a height suitable for installing the lifting component.

[0081] In this process, the first wheel drives the second wheel to overcome the elastic force of the elastic element and rotate in the direction of the release belt, so that the wound belt on the second wheel is released.

[0082] S7. Secure the lifting components and the suspended ends of the belt.

[0083] S8. The first driving component drives the first shaft to rotate, causing the first wheel to lift until the lifting component is lifted to a predetermined height.

[0084] During this process, the second shaft rotates under the action of the elastic element and the belt is lifted by the second wheel.

[0085] The elastic member pre-tightening installation step in the installation method based on the lifting device in this embodiment can be performed at a low position, which is convenient for operation, and the belt is not pulled by the gravity of the lifting member during this process. The lifting member installation step is performed when the lifting device has reached the set height, at which time the belt is fixed with the lifting member, and the lifting member is lifted by the first wheel, and the lifted belt is wound by the second wheel. During this process, the first wheel only drives the belt and does not wind the belt, the diameter of the belt on the first wheel does not change, and the lifting member lifted by the belt through the first wheel is also uniform, so that the lifting member can be stably and uniformly lifted to the set height. The belt is not subjected to the impact of force when the speed changes during this process, and is not easy to be damaged, thereby improving the service life of the belt. The elastic force of the elastic member rotates the second wheel in real time to wind the lifted belt, and the belt will not be sagged and interfere with other components.

[0086] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A lifting device, characterized by: The utility model relates to a lifting device, comprising: a first winding and unwinding mechanism comprising a first shaft and a first wheel arranged on the first shaft; a second winding and unwinding mechanism comprising a second shaft, a second wheel arranged on the second shaft and a driving assembly, the driving assembly comprising an elastic member for elastically driving the second wheel to rotate; a belt mechanism comprising a belt wound on the second wheel at one end and connected with a lifting member after winding around the first wheel, when the first wheel drives the belt to lift the lifting member, the elastic member drives the second wheel to wind the belt being lifted, when the first wheel drives the belt to lower the lifting member, the second wheel releases the belt through the belt against the elastic force of the elastic member.

2. The lift device of claim 1, wherein: The driving assembly has two, and the two driving assemblies are respectively located at two ends of the second shaft.

3. The lift device of claim 2, wherein: The second wheel and the belt are one-to-one corresponding, and a plurality of second wheels are arranged on the second shaft in an axial direction.

4. The lift device of claim 3, wherein: The second shaft has a plurality of second shafts arranged in an axial direction, and one or more second wheels are arranged on each second shaft.

5. The lifting device according to any one of claims 1-4, characterized in that: The utility model further comprises a sensor corresponding to the second shaft, the sensor being used for detecting whether the belt between the first wheel and the second wheel is sagging.

6. The lift device of claim 1, wherein: The first winding and unwinding mechanism further comprises a first driving member and a worm gear transmission assembly, and the first driving member drives the first wheel to rotate through the worm gear transmission assembly.

7. The lift device of claim 1, wherein: The elastic member is a coil spring or a torsion spring.

8. The lift device of claim 1, wherein: The driving assembly further comprises a housing, the elastic member is a coil spring, the coil spring is located in the housing, one end of the second shaft is inserted into the housing and is rotationally connected with the housing, an outer ring end of the coil spring is fixedly connected with the housing, and an inner ring end of the coil spring is fixed with the second shaft.

9. The lift device of claim 8, wherein: The housing comprises a box body and a cover, the box body and the cover define a closed cavity for placing the coil spring, a box bottom of the box body is provided with a first hole for the second shaft to pass through, and a box wall of the box body is provided with a second hole for the outer ring end of the coil spring to pass through.

10. The lift device of claim 1, wherein: The belt mechanism further comprises a third wheel between the first wheel and the second wheel, the belt passes between the first wheel and the third wheel, and the third wheel is used for limiting the belt from being separated from the first wheel.

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