Mechanical lifting platform with accelerated speed

Abstract

The utility model discloses a mechanical lifting platform with acceleration. The mechanical lifting platform comprises a platform body and a driving system, the table body is arranged above the driving system; the driving system comprises a motor speed reducer, a rigid coupling, a secondary speed reducer, a universal coupling and an acceleration and deceleration eccentric wheel assembly; the output end of the motor speed reducer is connected with two secondary speed reducers through two rigid couplings respectively, the two rigid couplings are longitudinally and symmetrically arranged, the output ends of the secondary speed reducers are connected with two acceleration and deceleration eccentric wheel assemblies through two universal couplings respectively, and the two universal couplings connected to the same secondary speed reducer are symmetrically arranged. The two acceleration and deceleration eccentric wheel assemblies connected to the same second-stage speed reducer are symmetrically arranged and are the same in rotating direction, and the eccentric wheel assemblies connected to different second-stage speed reducers are opposite in rotating direction. The acceleration and deceleration eccentric wheel assembly is fixedly connected with the table body. The lifting platform has the advantages that the problems of sudden start and stop, unstable lifting and large start and stop torque and static load torque of the lifting platform are solved, and the transmission efficiency and reliability of the lifting platform are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stage performance mechanical equipment, in particular to a lifting platform with mechanical acceleration. Background Art

[0002] Stage performance is an important form of cultural art. With the continuous upgrading of cultural consumption and the rapid development of the cultural and entertainment industry, the requirements of the audience for stage performance are constantly increasing, and the requirements of actors and equipment users for the quality of stage equipment are also getting higher and higher. As an important part of stage equipment, the lifting platform needs to be kept stable during the lifting process to avoid unnecessary shaking and bumping for the actors and ensure that the actors can perform smoothly on the stage.

[0003] At present, most lifting platforms adopt control means such as adding frequency converters and encoders to ensure the stable operation of the lifting platform; because there is acceleration during the start-up and stop processes of using frequency converters, the starting and braking torques are increased, which causes damage to drive transmission parts such as motor reducers and reduces their service life; and because the static load borne by the lifting platform is greater than the dynamic load, as a stage surface performance type, the static load torque of the equipment is large, and a brake needs to be added to solve the problem of large static load torque; at the same time, due to the increase in equipment on the transmission and drive paths, not only does the cost of the lifting platform increase significantly, but also the transmission efficiency and reliability of the lifting platform are reduced. Content of the Utility Model

[0004] The purpose of the utility model is to provide a lifting platform with mechanical acceleration, so as to solve the foregoing problems existing in the prior art.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A lifting platform with mechanical acceleration includes a platform body and a drive system; the platform body is horizontally arranged above the drive system; the drive system includes a motor reducer, a rigid coupling, a secondary reducer, a universal coupling and an acceleration and deceleration eccentric wheel assembly; the output end of the motor reducer is respectively connected with two secondary reducers through two rigid couplings, and the two rigid couplings are longitudinally symmetrically arranged. The output end of the secondary reducer is respectively connected with two acceleration and deceleration eccentric wheel assemblies through two universal couplings. The two universal couplings connected to the same secondary reducer are horizontally symmetrically arranged. The two acceleration and deceleration eccentric wheel assemblies connected to the same secondary reducer are symmetrically arranged and have the same rotation direction, and the eccentric wheel assemblies connected to different secondary reducers have opposite rotation directions; the acceleration and deceleration eccentric wheel assemblies are all fixedly connected to the lower side of the platform body to drive the platform body to lift.

[0007] Preferably, the acceleration and deceleration eccentric wheel assembly includes a driving eccentric wheel, a driving wheel support, a driven wheel and a connecting seat; the center of the driving eccentric wheel does not coincide with the rotation center, the rotation center of the driving eccentric wheel is connected to the driving wheel support through a pedestal bearing, a spacer sleeve is arranged between the pedestal bearing and the driving eccentric wheel, the center of the driven wheel is rotationally connected to the connecting seat, the connecting seat is fixedly connected to the lower surface of the table body, and the driving eccentric wheel meshes with the driven wheel.

[0008] Preferably, the lifting table further includes a support assembly, and the support assembly includes a support seat, a support rod and an adjusting bolt; the lower end of the support rod extends into the support seat through the upper end of the support seat, and the upper end of the support rod extends vertically towards the direction close to the table body; an adjusting hole communicated with the inside thereof is arranged on the outer wall of the support seat, threads are arranged in the adjusting hole, and one end of the adjusting bolt extends into the adjusting hole and meshes with the internal threads; the extending end of the adjusting bolt contacts or is away from the support rod to lock the support rod at the corresponding position of the support seat or move up and down in the support seat.

[0009] Preferably, the lifting table further includes a guide cylinder assembly, and at least one guide cylinder assembly is arranged between two adjacent acceleration and deceleration driving eccentric wheel assemblies; the guide cylinder assembly includes a fixed seat and a telescopic rod arranged on the fixed seat, and the telescopic end of the telescopic rod is fixedly connected to the lower surface of the table body.

[0010] Preferably, the lifting table further includes a limit switch system, and the limit switch system is used to control the lifting stroke of the table body.

[0011] Preferably, the limit switch system includes a switch assembly and a bumper iron assembly.

[0012] The beneficial effects of the present utility model are as follows: 1. Utilize the mechanical properties of the transmission structural members themselves with acceleration and deceleration to solve the problems of rapid start and stop, unstable lifting, large starting and stopping torques and static load torques of the lifting table, and improve the transmission efficiency and reliability of the lifting table. 2. Use the change in the distance between the rotation center and the driven wheel itself during the rotation of the eccentric wheel, which has the mechanical properties of acceleration and deceleration, to achieve the purpose of slow start and stop of the lifting table, and reduce the starting and braking torques of the driving transmission members. When the lifting table is at the highest position and bears a static load, most or even all of the load is transmitted to the fixed base through the transmission structural members, reducing the static load torque borne by the driving transmission members; due to the reduction of components on the transmission path, energy loss is reduced, and the components of the control system are fewer, improving the transmission efficiency and reliability of the lifting table. Description of the Drawings

[0013] Figure 1 is the top view of the lifting table with acceleration and deceleration of the machine in the embodiment of the present utility model;

[0014] Figure 2It is the front view of the lifting table with acceleration and deceleration in the embodiment of the present utility model;

[0015] Figure 3 It is the top view of the drive system in the embodiment of the present utility model;

[0016] Figure 4 It is the right view of the drive system in the embodiment of the present utility model;

[0017] Figure 5 It is the structural diagram of the acceleration and deceleration eccentric wheel assembly in the embodiment of the present utility model;

[0018] Figure 6 It is the state diagram of the lowest and highest positions of the lifting table with acceleration and deceleration in the embodiment of the present utility model.

[0019] In the figure: 1. Table body; 2. Drive system; 21. Motor reducer; 22. Rigid coupling; 23. Secondary reducer; 24. Universal coupling; 25. Acceleration and deceleration eccentric wheel assembly; 251. Pillow block bearing; 252. Sleeve; 253. Active eccentric wheel; 254. Active wheel support; 255. Driven wheel; 256. Connecting seat; 3. Limit switch system; 4. Support assembly; 5. Guide cylinder assembly. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] As Figure 1 and Figure 2 shown, in this embodiment, a lifting table with acceleration in a machine is provided, including a table body 1 and a drive system 2; the table body 1 is horizontally arranged above the drive system 2; the drive system 2 includes a motor reducer 21, a rigid coupling 22, a secondary reducer 23, a universal coupling 24 and an acceleration and deceleration eccentric wheel assembly 25; the output ends of the motor reducer 21 are respectively connected with two secondary reducers 23 through two rigid couplings 22, and the two rigid couplings 22 are longitudinally symmetrically arranged. The output ends of the secondary reducers 23 are respectively connected with two acceleration and deceleration eccentric wheel assemblies 25 through two universal couplings 24. The two universal couplings 24 connected to the same secondary reducer 23 are horizontally symmetrically arranged. The two acceleration and deceleration eccentric wheel assemblies 25 connected to the same secondary reducer 23 are symmetrically arranged and have the same rotation direction, and the eccentric wheel assemblies 25 connected to different secondary reducers 23 have opposite rotation directions; the acceleration and deceleration eccentric wheel assembly 25 is fixedly connected to the lower side of the table body 1 to drive the table body 1 to lift.

[0022] See attachedFigure 1 There are four acceleration and deceleration eccentric wheel assemblies 25, which are respectively located at the four corners of the lower side of the table body 1. The four acceleration and deceleration eccentric wheels are symmetrically arranged in pairs and rotate in opposite directions. The motor reducer 21 drives the rigid coupling 22 to rotate to transmit the driving force to the secondary reducer 23. Through the secondary reducer 23, the rotational speed is reduced but the driving torque is increased. Via the universal coupling 24, the eccentric wheel of the acceleration and deceleration eccentric wheel assembly 25 is driven to rotate, driving the driven wheel 255 to perform a lifting motion; the driven wheel 255 is connected to the table body 1, and then the lifting table completes the lifting action.

[0023] In this embodiment, as Figures 3 to 5 shown, the acceleration and deceleration eccentric wheel assembly 25 includes a driving eccentric wheel 253, a driving wheel support 254, a driven wheel 255 and a connecting seat 256; the center of the driving eccentric wheel 253 does not coincide with the rotation center, and the rotation center of the driving eccentric wheel 253 is connected to the driving wheel support 254 through a pedestal bearing 251. A spacer sleeve 252 is arranged between the pedestal bearing 251 and the driving eccentric wheel 253. The center of the driven wheel 255 is rotatably connected to the connecting seat 256, and the connecting seat 256 is fixedly connected to the lower surface of the table body 1. The driving eccentric wheel 253 meshes with the driven wheel 255.

[0024] The driving eccentric wheel 253 converts the rotational motion into the linear motion of the driven wheel 255. Without adding a conversion mechanism, the purpose of the slow start and slow stop of the lifting table can be achieved, and the starting and braking torques of the driving transmission parts are reduced. During the rotation of the driving eccentric wheel 253, its center performs a circular motion around the rotation center, and the distance between the center of the driven wheel 255 and the center of the driving eccentric wheel 253 is constantly changing, and the distance between the table body 1 and the ground also changes accordingly.

[0025] In this embodiment, as Figure 6 shown, when the center of the driving eccentric wheel 253 moves to the directly below of the rotation center, the table body 1 descends to the lowest point. The distance between the rotation center of the driving eccentric wheel 253 and the contact point of the driven wheel 255 is the shortest. When the angular velocity of the motor reducer 21 is fixed, at this time, the linear velocity of the driving eccentric wheel 253 is the smallest, the starting speed is low, and the lifting table starts smoothly. At this time, the load of the lifting table is transmitted to the driving eccentric wheel 253 through the driven wheel 255, and no torque is generated through the rotation center, and the driving torque is small.

[0026] During the lifting process, the driving eccentric wheel 253 rotates around the rotation center, and the driven wheel 255 connected to the table body 1 rises and falls along the smooth curve of the driving eccentric wheel 253, and the lifting is continuous and stable.

[0027] When the center of the driving eccentric wheel 253 moves to directly above the rotation center, the table body 1 rises to the highest point. The curve of the eccentric wheel is smooth, and the lifting speed of the lifting table is very small. Under the control of the limit switch system 3, the motor reducer 21 stops rotating, and the lifting table slowly stops. At this time, the lever arm of the load on the lifting table from the rotation center is small, the braking torque is small, a static load is applied to the surface of the lifting table, and the static load torque is also small.

[0028] In this embodiment, a set of pedestal bearings 251 are arranged on each side of the driving eccentric wheel 253 and are installed on the driving wheel support 254, which can ensure the smooth and stable rotation of the driving eccentric wheel 253.

[0029] In this embodiment, the lifting table further includes a support assembly 4. The support assembly 4 includes a support base, a support rod, and an adjustment bolt; the lower end of the support rod extends into the support base through the upper end of the support base, and the upper end of the support rod extends vertically towards the direction close to the table body 1; an adjustment hole communicating with its interior is arranged on the outer wall of the support base, threads are arranged in the adjustment hole, and one end of the adjustment bolt extends into the adjustment hole and meshes with the internal threads; the extending end of the adjustment bolt contacts or moves away from the support rod to lock the support rod at the corresponding position of the support base or move up and down in the support base.

[0030] By adjusting the contact position between the adjustment bolt and the support rod, the support rod can be locked at the corresponding position of the support base to realize the adjustment of the extending length of the support rod. When the table body 1 descends to the lowest position, the upper end of the support rod contacts the table body 1, thereby bearing part of the static load of the lifting table.

[0031] In this embodiment, the lifting table further includes a guide cylinder assembly 5. At least one guide cylinder assembly 5 is arranged between two adjacent acceleration and deceleration driving eccentric wheel 253 assemblies; the guide cylinder assembly 5 includes a fixed seat and a telescopic rod arranged on the fixed seat, and the telescopic end of the telescopic rod is fixedly connected to the lower surface of the table body 1. The guide cylinder assembly 5 expands and contracts as the table body 1 rises and falls. On the one hand, it bears the lateral load of the table body 1, and on the other hand, it restricts the planar displacement of the table body 1.

[0032] The installation position and quantity of the guide cylinder assembly 5 can be selected according to actual situations to better meet actual needs. As shown in the figure, a guide cylinder assembly 5 is arranged between two adjacent acceleration and deceleration eccentric wheel assemblies 25 in the direction parallel to the rigid coupling 22.

[0033] In this embodiment, the lifting table further includes a limit switch system 3. The limit switch system 3 is used to control the lifting stroke of the table body 1. Specifically: the limit switch system 3 includes a switch assembly and a bumper assembly, and the bumper assembly restricts the lifting stroke of the control table 1 by touching the upper and lower switch assemblies.

[0034] By adopting the above technical solutions disclosed by the present utility model, the following beneficial effects are obtained:

[0035] The present utility model provides a lifting table with acceleration and deceleration functions. By utilizing the mechanical properties of the transmission structural components themselves, which have acceleration and deceleration capabilities, problems such as sudden start and stop, unstable lifting, large starting and stopping torques, and large static load torques of the lifting table are solved, and the transmission efficiency and reliability of the lifting table are improved. The distance between the rotation center and the driven wheel itself changes during the rotation of the eccentric wheel, which has the mechanical properties of acceleration and deceleration, achieving the purpose of slow start and stop of the lifting table and reducing the starting and braking torques of the drive transmission components. When the lifting table is at the highest position and bears the static load, most or even all of the load is transmitted to the fixed base through the transmission structural components, reducing the static load torque borne by the drive transmission components; due to the reduction of components in the transmission path, energy loss is reduced, and the number of components in the control system is small, improving the transmission efficiency and reliability of the lifting table.

[0036] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A mechanical lifting platform having acceleration, characterized in that: It includes a platform and a driving system; the platform is horizontally arranged above the driving system; the driving system includes a motor reducer, a rigid coupling, a secondary reducer, a universal coupling and an acceleration / deceleration eccentric wheel assembly; the output end of the motor reducer is respectively connected to two secondary reducers via two rigid couplings, the two rigid couplings are longitudinally symmetrically arranged, the output end of the secondary reducer is respectively connected to two acceleration / deceleration eccentric wheel assemblies via two universal couplings, the two universal couplings connected to the same secondary reducer are laterally symmetrically arranged, the two acceleration / deceleration eccentric wheel assemblies connected to the same secondary reducer are symmetrically arranged and have the same direction of rotation, and the eccentric wheel assemblies connected to different secondary reducers have opposite directions of rotation; the acceleration / deceleration eccentric wheel assemblies are all fixedly connected to the lower side of the platform to drive the platform to rise and fall.

2. The mechanical lifting platform with acceleration according to claim 1, characterized in that: The acceleration and deceleration eccentric wheel assembly includes an active eccentric wheel, an active wheel support, a driven wheel and a connecting seat; the center of the active eccentric wheel does not coincide with the rotation center, the rotation center of the active eccentric wheel is connected to the active wheel support via a seat bearing, a spacer sleeve is provided between the seat bearing and the active eccentric wheel, the center of the driven wheel is rotatably connected to the connecting seat, the connecting seat is fixedly connected to the lower surface of the platform, and the active eccentric wheel is meshed with the driven wheel.

3. The mechanical lifting platform with acceleration according to claim 1, characterized in that: The lifting platform also includes a support assembly, which includes a support seat, a support rod and an adjusting bolt; the lower end of the support rod extends into the support seat through the upper end of the support seat, and the upper end of the support rod extends vertically toward the platform body; an adjustment hole connected to the interior of the support seat is provided on the outer wall of the support seat, and a thread is provided in the adjustment hole, and one end of the adjusting bolt extends into the adjustment hole and engages with the thread inside the hole; the extending end of the adjusting bolt contacts or moves away from the support rod, so that the support rod is locked in the corresponding position of the support seat or moves up and down in the support seat.

4. The mechanical lifting platform with acceleration according to claim 1, characterized in that: The lifting platform also includes a guide cylinder assembly, and at least one guide cylinder assembly is arranged between two adjacent acceleration and deceleration active eccentric wheel assemblies; the guide cylinder assembly includes a fixed seat and a telescopic rod arranged on the fixed seat, and the telescopic end of the telescopic rod is fixedly connected to the lower surface of the platform body.

5. The mechanical lifting platform with acceleration according to any one of claims 1 to 4, characterized in that: The lifting platform also includes a limit switch system, which is used to control the lifting stroke of the platform body.

6. The mechanical lifting platform with acceleration according to claim 5, characterized in that: The limit switch system comprises a switch component and an iron contact component.

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