Lifting platform

Abstract

A lifting platform comprises a base through frame; the first lifting platform is movably mounted on the base through frame in a lifting manner in the vertical direction; the first driving device comprises a first driving part and a first transmission assembly, and the first driving part drives the first lifting table to ascend and descend through the first transmission assembly; the second lifting table is slidably mounted above the first lifting table in the vertical direction; the second driving device comprises a second screw rod, a second rotating nut and a second motor which are vertically fixed on the bottom surface of the second lifting platform; the second motor is fixedly arranged on the first lifting table, is in transmission connection with an inner ring of the second rotating nut through a second transmission assembly and drives the second lifting table to be close to or away from the first lifting table. By means of the scheme, the minimum total installation height of the whole lifting platform in the vertical direction is effectively reduced, it is guaranteed that the lifting platform can be used on the occasion with the low-height space, and the problem that in the related technology, the total installation height of the lifting platform is large, and consequently adaptability is poor is solved.

Description

Technical Field

[0001] This application relates to the field of transportation equipment technology, specifically to a lifting platform. Background Technology

[0002] As an important vertical transportation device, lifting platforms are widely used in industrial production lines, warehousing and logistics, theaters, parking lots, and various building facilities to achieve vertical displacement and docking of goods or personnel in confined spaces. With the increasing scarcity of land resources and the ever-increasing demands for space utilization efficiency, how to achieve stable, high-load lifting operations in situations with extremely limited vertical space (such as low-rise factories, renovations of existing buildings, and underground spaces) has become one of the key problems that urgently need to be solved in this field.

[0003] Currently, most mainstream lifting platforms on the market adopt traditional electromechanical drive structures, which typically consist of a motor (or hydraulic device), a transmission system, a load-bearing mover (such as a platform or car), and fixed bearing seats at both ends of the travel stroke. The total vertical installation height (or "envelope height") of this type of lifting platform is usually the sum of its effective travel stroke, the motor's own height, the mover thickness, and the installation space of the bearing seats at both ends. This means that during installation, the minimum space required in its travel direction (i.e., the height direction) must be greater than its designed lifting stroke.

[0004] Given the aforementioned structural characteristics, traditional lifting platforms, when applied in situations where vertical space is already limited, often require excavating a pit to partially or completely submerge the equipment below ground level to compensate for the spatial difference in order to ensure that the total installation height exceeds the effective stroke. This method not only increases the complexity and cost of civil construction and damages the original ground structure, but is also difficult to implement in existing locations where underground excavation is not feasible. Besides traditional solutions, there is also the scissor lift mechanism, which consists of multiple sets of intersecting scissor arms hinged together by pins. While this can reduce the vertical space occupied by the drive structure to some extent, thus compressing the total installation height of the lifting platform, significant cumulative errors occur at the top platform due to manufacturing tolerances of each scissor arm and assembly clearances at the hinge points. This leads to a deviation between the theoretically calculated height and the actual height. Furthermore, it is difficult to precisely adjust the platform to the operator's required height during height changes. Therefore, it can be seen that existing lifting platforms suffer from poor adaptability to different scenarios and low operational accuracy, requiring further improvement. Summary of the Invention

[0005] This application provides a lifting platform that can solve the problem that traditional lifting platforms in the prior art are difficult to use in situations where there is insufficient height space.

[0006] This application provides a lifting platform, which adopts the following technical solution:

[0007] The lifting platform includes:

[0008] Base frame;

[0009] The first lifting platform is located inside the base frame and is vertically and movably installed on the base frame.

[0010] A first driving device includes a first driving part and a first transmission assembly. The first transmission assembly is drivingly connected to the first lifting platform and the first lifting platform. The first driving part drives the first lifting platform to rise and fall through the first transmission assembly.

[0011] The second lifting platform is slidably installed above the first lifting platform in a vertical direction;

[0012] The second driving device includes a second lead screw, a second rotating nut, and a second motor, which are fixed vertically to the bottom surface of the second lifting platform. The outer ring of the second rotating nut is fixedly installed on the first lifting platform. The second lead screw passes through the first lifting platform and is threadedly engaged with the inner ring of the second rotating nut. The second motor is fixedly installed on the first lifting platform and is connected to the inner ring of the second rotating nut via a second transmission assembly. The motor drives the inner ring of the second rotating nut to rotate, thereby moving the second lifting platform closer to or away from the first lifting platform.

[0013] In one embodiment, the first lifting platform is slidably mounted vertically on the base frame;

[0014] The first driving unit includes a first lead screw arranged vertically, a first rotating nut threaded onto the first lead screw, and a first motor. The bottom end of the first lead screw is fixedly connected to the base frame, and the first lead screw and the second lead screw are staggered on the horizontal plane. The outer ring of the first rotating nut is fixedly connected to the first lifting platform. The first motor is fixedly mounted on the first lifting platform and is connected to the inner ring of the first rotating nut through a first transmission assembly, so as to drive the first lifting platform to rise and fall along the first lead screw by driving the inner ring of the first rotating nut to rotate.

[0015] In one embodiment, the first driving unit includes two sets of the first lead screws and the first rotating nut, and / or, the second driving device includes two sets of the first lead screws and the second rotating nut, and...

[0016] The first transmission assembly includes a first transmission belt, which is wound around the inner rings of the two first rotating nuts and the output end of the first motor, thus drivingly connecting the three together to achieve a transmission connection between the first motor and the two first rotating nuts; and / or,

[0017] The second transmission assembly includes a second transmission belt, which is wound around the inner rings of the two second rotating nuts and the output end of the second motor to drive and connect the three, thereby realizing the transmission connection between the second motor and the two second rotating nuts.

[0018] In one embodiment, the vertical center sections of the first lifting platform and the second lifting platform coincide, multiple sets of the first lead screws and multiple sets of the second lead screws are arranged at intervals within the same vertical center section, and the first rotating nut and the second rotating nut are installed at different heights on the first lifting platform.

[0019] In one embodiment, the first motor and the second motor are positioned opposite each other on both sides of the first lifting platform, and their installation positions are symmetrical relative to the vertical mounting surface.

[0020] In one embodiment, a plurality of first guide rods arranged vertically are fixed on the base frame, and a first linear bearing that is slidably sleeved with the first guide rods is fixed on the first lifting platform.

[0021] The second lifting platform is fixedly provided with a plurality of second guide rods arranged vertically, and the first lifting platform is provided with a second linear bearing that is slidably sleeved with the second guide rods.

[0022] In one embodiment, each of the first lead screws is provided with a first guide rod on both sides and they are symmetrical to each other, and the four first guide rods are distributed at the four corner points of the first rectangular area in the horizontal plane;

[0023] Each second lead screw has a second guide rod on both sides, which are symmetrical to each other. The four second guide rods are distributed at the four corner points of the second rectangular area in the horizontal plane. The second rectangular area and the first rectangular area share the same central axis, and the area of ​​the first rectangular area is larger than that of the second rectangular area.

[0024] In one embodiment, a protective cover is provided around the top periphery of the second lifting platform and the bottom of the base frame, the protective cover being extendable in the vertical direction.

[0025] In one embodiment, both the base frame and the first lifting platform are equipped with grating rulers. The two grating rulers are used to detect the first relative height of the first lifting platform relative to the base frame and the second relative height of the second lifting platform relative to the first lifting platform, respectively.

[0026] In one embodiment, a control device is also included, which is electrically connected to the grating ruler and the first drive component and the second drive component, and is used to send an operation signal to one or both of the first drive component and the second drive component.

[0027] The beneficial effects of the technical solutions provided in this application include:

[0028] The lifting platform provided in this application divides the overall stroke of the lifting platform into two segments by sequentially arranging a first lifting platform and a second lifting platform that can move vertically on the base frame. For the second stroke corresponding to the second lifting platform, since the second drive device used adopts a screw-driven structure of a second lead screw, a second rotating nut, and a second motor, and the second lead screw passes downward through the first lifting platform in the vertical direction, the structure for realizing the second stroke does not occupy any additional fixed space in the vertical height. Instead, it can reuse the space below the first lifting platform, achieving a larger stroke of the second lifting platform at a smaller installation height. This effectively reduces the minimum total installation height of the overall lifting platform in the vertical direction, ensuring that the lifting platform can be used in situations with low-height spaces. This effectively solves the problem of poor adaptability to installation and use caused by the large total installation height of traditional lifting platforms in related technologies.

[0029] Furthermore, since the height control of the second lifting platform is achieved through a lead screw drive structure, specifically by driving the second lead screw to lift and lower through the relative rotation angle between the second lead screw and the second rotating nut, the structural errors between them are relatively small. Therefore, the accumulated error during the lifting process will be significantly reduced compared to existing technologies. At the same time, in terms of control accuracy, only start-stop control or output angle control of the second motor is needed to effectively control the height position of the second lifting platform. The control process is simpler and more accurate, solving the problem of low height control accuracy of lifting platforms in related technologies. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the lifting platform of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the first and second lifting platforms in one embodiment of the lifting platform of this application;

[0032] Figure 3This is a schematic diagram of the structure of the first drive device and the second drive device in one embodiment of the lifting platform of this application;

[0033] Figure 4 This is a schematic diagram showing the arrangement of the first and second rotating nuts in one embodiment of the lifting platform of this application;

[0034] Figure 5 This is a side view of an embodiment of the lifting platform of this application;

[0035] Figure 6 for Figure 5 Cross-sectional view of line AA;

[0036] Figure label:

[0037] 1. Base frame; 10. First guide rod; 100. First linear bearing; 2. First lifting platform; 20. Platform; 21. First mounting bracket; 22. Second mounting bracket; 30. First lead screw; 31. First rotating nut; 32. First motor; 33. First transmission belt; 34. First synchronous pulley; 4. Second lifting platform; 40. Top plate; 41. Second guide rod; 410. Second shaft bearing; 50. Second lead screw; 51. Second rotating nut; 52. Second motor; 53. Second transmission belt; 54. Second synchronous pulley; 6. Grating ruler. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0039] When traditional lifting platforms are used in situations where vertical space is limited, in order to ensure that the total installation height exceeds the effective travel, it is often necessary to excavate a pit to partially or completely submerge the equipment below ground level to compensate for the spatial difference. This method not only increases the complexity and cost of civil construction and damages the original ground structure, but is also difficult to implement in existing sites where underground excavation is not feasible. Besides traditional solutions, there is also the scissor lift mechanism, which consists of multiple sets of intersecting scissor arms hinged together by pins. While this can reduce the vertical space occupied by the drive structure to some extent, thus compressing the total installation height of the lifting platform, errors such as manufacturing tolerances of each scissor arm and assembly clearances at the hinge points accumulate significantly at the top platform due to the progressive transmission and superposition of errors across multiple booms. This leads to a deviation between the theoretically calculated height and the actual height. Furthermore, it is difficult to precisely adjust the platform to the operator's desired height during height changes. Therefore, it can be seen that existing lifting platforms suffer from poor adaptability to different scenarios and low operational accuracy, requiring further improvement.

[0040] To address the aforementioned issues, the lifting platform provided in this application divides the overall travel of the lifting platform into two segments by sequentially arranging a first lifting platform and a second lifting platform that can move vertically on the base frame. For the second segment of travel corresponding to the second lifting platform, since the second drive device uses a screw-driven structure consisting of a second lead screw, a second rotating nut, and a second motor, and the second lead screw passes vertically downward through the first lifting platform, the structure for realizing the second travel does not further occupy fixed space in the vertical height. Instead, it can reuse the space below the first lifting platform, achieving a larger travel of the second lifting platform at a smaller installation height. This effectively reduces the overall minimum vertical installation height of the lifting platform. The height ensures that this lifting platform can be used in situations with low ceiling height, effectively solving the problem of poor adaptability in installation and use caused by the large total installation height of traditional lifting platforms in related technologies. In addition, since the height control of the second lifting platform is achieved through a screw drive structure, specifically by driving the second screw to lift by the relative rotation angle between the second screw and the second rotating nut, the structural errors between them are small. Therefore, the accumulated error during the lifting process will be significantly reduced compared with existing technologies. At the same time, in terms of control accuracy, only the start-stop control or output angle control of the second motor is needed to effectively control the height position of the second lifting platform. The control process is simpler and more accurate, solving the problem of low height control accuracy of lifting platforms in related technologies.

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0042] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of the lifting platform of this application. The lifting platform includes a base frame 1, a first lifting platform 2, a first drive unit, a second lifting platform 4, and a second drive device. The base frame 1 serves as the bottom foundation for the overall lifting platform, providing a basis for the subsequent installation of the first lifting platform 2 and the second lifting platform 4. The first lifting platform 2 and the second lifting platform 4 are installed sequentially from bottom to top on the base frame 1. The first lifting platform 2 is raised and lowered on the base frame 1 via the first drive unit, and the second lifting platform 4 is raised and lowered on the first lifting platform 2 via the second drive device. Ultimately, the overall stroke of this lifting platform is determined by the combination of the first stroke of the first lifting platform 2 and the second stroke of the second lifting platform 4.

[0043] Specifically, different drive installation structures can be adopted for the first drive unit. However, it is understood that since this application divides the total stroke into the first lifting platform 2 and the second lifting platform 4, the first stroke corresponding to the first lifting platform 2 is relatively small. Therefore, even if the first drive unit needs to occupy a fixed space in the vertical installation height of the overall lifting platform, the actual height occupied is relatively small.

[0044] Reference Figure 2-4 As for the second driving device, this application specifically includes a second lead screw 50, a second rotating nut 51, and a second motor 52, which are vertically fixed to the bottom surface of the second lifting platform 4 (see...). Figure 6The second rotating nut 51 has an inner ring and an outer ring that are rotatably engaged. When the second lead screw 50 passes through the first lifting platform 2, the second rotating nut 51 is sleeved on it. The inner ring of the second rotating nut 51 is threadedly engaged with the second lead screw 50, while the outer ring end face of the second rotating nut 51 is attached to and fixedly connected to the first lifting platform 2. At the same time, a second synchronous pulley 54, coaxially mounted and sleeved on the second lead screw 50, is fixedly connected to the inner ring end face of the second rotating nut 51 by bolts. The synchronous pulley and the second lead screw 50 are in sliding contact or not in contact, and the second synchronous pulley 54 rotates synchronously with the inner ring. The second motor 52 is fixedly mounted on the first lifting platform 2 and is connected to the second synchronous wheel 54 through the second transmission assembly, so as to synchronously drive the inner ring of the second synchronous wheel 54 and the second rotating nut 51. Since the second lifting platform 4 is slidably mounted on the first lifting platform 2 in the vertical direction, after driving the inner ring of the second rotating nut 51 to rotate, the second lifting platform 4 can be driven to move closer to or away from the first lifting platform 2. In this process, since the second lead screw and the second lifting platform 4 are raised and lowered synchronously in the vertical direction, the second lead screw 50 can further utilize the space below the first lifting platform 2 when it is raised and lowered, effectively reducing the structural installation space required for the second lifting platform 4 to be raised and lowered in the vertical direction.

[0045] Furthermore, for the second motor 52, in order to ensure that the second lifting platform 4 has better height control accuracy in the vertical direction, the second motor 52 in this embodiment is preferably a servo motor whose output angle can be set and controlled, so that the output angle of the second motor 52 can be actively adjusted as needed, and converted into the height of the second lifting platform 4 in the vertical direction through the relative rotation of the second lead screw 50 and the second rotating nut 51, thus ensuring the vertical position accuracy of the second lifting platform 4.

[0046] Furthermore, referring to Figure 2-3In some embodiments, to further ensure that the first drive unit driving the first lifting platform 2 increases the total installation height of the lifting platform, the first drive unit adopts the same screw drive structure as the second drive device to realize the lifting of the first lifting platform 2. That is, the first drive unit includes a first screw 30 arranged vertically, a first rotating nut 31 with its inner ring threaded on the first screw 30, and a first motor 32. The bottom end of the first screw 30 is fixedly connected to the base frame 1, and to avoid the second screw 50 passing through the first lifting platform 2 from interfering with the first screw 30, this application specifically arranges the first screw 30 and the second screw 50 in a staggered manner on the horizontal plane. The installation form of the outer ring and inner ring of the first rotating nut 31 is the same as that of the second rotating nut 51, so that its outer ring is fixedly connected to the first lifting platform 2, and the inner ring is connected to the first motor 32 through a coaxially bolted first synchronous pulley 34. The first motor 32 is also fixedly mounted on the first lifting platform 2. Finally, by driving the inner ring of the first rotating nut 31 of the first synchronous wheel 34 to rotate, the first lifting platform 2 is driven to rise and fall along the first lead screw 30. Since the first lead screw 30 remains in a fixed position when the first lifting platform 2 is raised and lowered, the first lead screw 30, which needs to occupy a fixed height, can utilize the space above the first lifting platform 2 during relative movement. Furthermore, due to the staggered arrangement of the first lead screw 30 and the second lead screw 50, the two can be kept separate from each other, thus effectively reducing the vertical structural installation height required for the first lifting platform 2 and the second lifting platform 4 to achieve raising and lowering.

[0047] Furthermore, in some embodiments, reference is made to... Figure 2-3 The first driving unit includes two sets of first lead screws 30 and first rotating nuts 31, and / or the second driving device includes two sets of first lead screws 30 and second rotating nuts 51. In this embodiment, preferably, both the first driving device and the second driving device include two sets of nut-lead screw structures. To ensure that the first lifting platform 2 and the second lifting platform 4 can rise and fall stably under the drive of the two sets of nut-lead screw structures, the first transmission assembly and the second transmission assembly are respectively used to synchronously drive the corresponding two sets of nut-lead screw structures.

[0048] Specifically, the first conventional component includes a first transmission belt 33, which is wound around the inner rings of the two first rotating nuts 31 and the output end of the first motor 32, thus drivingly connecting the first motor 32 to the two first rotating nuts 31. The second transmission component includes a second transmission belt 53, which is wound around the inner rings of the two second rotating nuts 51 and the output end of the second motor 52, thus drivingly connecting the second motor 52 to the two second rotating nuts 51.

[0049] This configuration allows for the simultaneous driving of multiple first lead screws 30 and multiple second lead screws 50 to the first lifting platform 2 and the second lifting platform 4 using a single drive unit. This reduces costs while ensuring more stable lifting of the first lifting platform 2 and the second lifting platform 4.

[0050] Furthermore, in some embodiments, reference is made to Figure 2-3 The vertical center sections of the first lifting platform 2 and the second lifting platform 4 coincide, and multiple sets of the first lead screws 30 and multiple sets of the second lead screws 50 are arranged at intervals within the same vertical center section. The first rotating nut 31 and the second rotating nut 51 are installed at different heights on the first lifting platform 2.

[0051] Specifically, the first lifting platform 2 includes a frame 20, two first mounting brackets 21, and two second mounting brackets 22. The two first mounting brackets 21 are symmetrically mounted at both ends of the bottom of the frame 20 and are respectively used for connection to first rotating nuts 31. That is, two first lead screws 30 are set at both ends of the bottom of the first lifting platform 2 through the first rotating nuts 31, and the line connecting the two is within the vertical center section of the first lifting platform 2. The two second mounting brackets 22 are spaced apart and mounted on the top of the frame 20, located inside the two first mounting brackets 21 and arranged symmetrically. Two second rotating nuts 51 are connected to the two second mounting brackets 22. That is, two second lead screws 50 are set on the top of the first lifting platform 2 through the second rotating nuts 51 and are located between the two first lead screws 30, so that the first lead screws 30 and the second lead screws 50 are in the same vertical plane.

[0052] This arrangement, with the first rotating nut 31 and the second rotating nut 51 vertically staggered, ensures that the first and second conveyor belts can extend horizontally, preventing positional conflicts between the two sets of conveyor belts. Ultimately, through this scheme, the drive structures of the first lifting platform 2 and the second lifting platform 4 are roughly located on the central cross-section of the overall device and symmetrically arranged, thereby ensuring the stability of the overall structure and effectively improving space utilization.

[0053] Furthermore, referring to Figure 5-6 In some embodiments, the first motor 32 and the second motor 52 are positioned opposite each other on the first lifting platform 2, and their installation positions are symmetrical relative to the vertical mounting surface.

[0054] Specifically, mounting points for fixing the first motor 32 and the second motor 52 are respectively provided on both sides of the platform 20, and the horizontal positions of the two mounting points are symmetrical about the platform 20. To ensure that the first transmission belt 33 and the second transmission belt 53 can horizontally transmit power to the first rotating nut 31 and the second rotating nut 51, which are vertically misaligned, the mounting points are vertically positioned between the first rotating nut 31 and the second rotating nut 51. The two mounting points are vertically misaligned and mutually reinforcing, so that the first motor 32 and the second motor 52 are installed inverted relative to each other. This allows the installation positions of the first motor 32 and the second motor 52 to more easily form a transmission connection with the first transmission belt 33 and the second transmission belt 53, while ensuring that the first motor 32 and the second motor 52 do not occupy excessive vertical space, thus reducing the overall installation height of the lifting platform.

[0055] Furthermore, referring to Figure 2-3 In some embodiments, in order to ensure that the first lifting platform 2 and the second lifting platform 4 can be smoothly slidably in the vertical direction and to guide and limit the screw drive structure connected to them, a plurality of first guide rods 10 arranged vertically are fixed on the base frame 1, and a first linear bearing 100 that is slidably sleeved with the first guide rod 10 is fixed on the first lifting platform 2; a plurality of second guide rods 41 arranged vertically are fixed on the second lifting platform 4, and a second linear bearing that is slidably sleeved with the second guide rod 41 is provided on the first lifting platform 2.

[0056] Specifically, refer to Figure 3 or Figure 6 Each first lead screw 30 has a first guide rod 10 on both sides, and they are symmetrical to each other. The two sets of first lead screws 30 and their respective first guide rods 10 are symmetrical to each other. Each second lead screw 50 has a second guide rod 41 on both sides, and they are symmetrical to each other. The two sets of second lead screws 50 and their respective second guide rods 41 are symmetrical to each other. This arrangement ensures that the first guide rods 10 and first lead screws 30 form a first rectangular area at the bottom of the first lifting platform 2, and the second guide rods 41 and second lead screws 50 form a second rectangular area at the top of the first lifting platform 2. The first rectangular area and the second rectangular area are concentric, and the first rectangular area is larger than the second rectangular area.

[0057] This configuration allows the first guide rod 10 and the first lead screw 30, which are used to install and support the first lifting platform 2 at the bottom, to provide multi-point support for the first lifting platform 2, the second lifting platform 4 above, and other structures from the outermost side. During installation, the second lifting platform 4 above is installed and supported from the inside through the second guide rod 41 and the second lead screw 50, ensuring that the overall structure can be carried out more stably. Furthermore, when the second lifting platform 4 is raised or lowered relative to the first lifting platform 2, the related structures are more compact, avoiding encroachment on external space or conflict with external structures.

[0058] Furthermore, in some embodiments, a protective cover (not shown in the figure) is provided around the top periphery of the second lifting platform 4 and the bottom of the base frame 1, and the protective cover is telescopically arranged in the vertical direction.

[0059] Specifically, refer to Figure 2-3 The second lifting platform 4 has a top plate 40, which is rectangular and has the same area as the top outer edge of the base frame 1. The top plate 40 is directly above the base frame 1, so that when the first lifting platform 2 and the second lifting platform 4 cooperate to descend, the top plate 40 can be moved down to the top of the base frame 1. The inner edge of the top of the protective cover is fixedly connected to the periphery of the top plate 40, and the inner edge of the bottom is fixedly connected to the outer bottom wall of the base frame 1. The protective cover is a retractable accordion cover, which allows the cover to extend and retract when the second lifting platform 4 rises, and to automatically compress and fold when it descends, ensuring that the base frame 1 and the structure below the top plate 40 are always covered by the protective cover, protecting the internal structure or preventing external personnel or objects from entering the interior.

[0060] Furthermore, referring to Figure 2 In some embodiments, both the base frame 1 and the first lifting platform 2 are provided with grating rulers 6. The two grating rulers 6 are used to detect the first relative height of the first lifting platform 2 relative to the base frame 1 and the second relative height of the second lifting platform 4 relative to the first lifting platform 2, respectively.

[0061] Specifically, the optical signal sensors in the grating ruler 6 are vertically arranged on both sides of the first lifting platform 2, pointing to the bottom surface of the base frame 1 and the bottom surface of the second lifting platform 4, respectively, to identify and detect the height position of the first lifting platform 2 relative to the base frame 1 and the height position of the second lifting platform 4 relative to the first lifting platform 2, ensuring that operators can perform lifting operations more accurately and quickly when actually using the lifting platform.

[0062] In addition, to ensure that the lifting control of the first lifting platform 2 and the second lifting platform 4 can be completed more effectively, quickly and accurately, the lifting platform also includes a control device (not shown in the figure). The control device is electrically connected to the grating ruler 6 and the first drive component and the second drive component, and is used to send a running signal to one or both of the first drive component and the second drive component.

[0063] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0064] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A lifting platform, characterized in that It includes: Base frame; The first lifting platform is vertically installed in the base frame and vertically moves on the base frame; The first driving device includes a first driving part and a first transmission assembly, the first transmission assembly is in transmission connection with the first lifting platform and the first lifting platform, and the first driving part drives the first lifting platform to move up and down through the first transmission assembly; The second lifting platform is vertically installed on the first lifting platform; The second driving device includes a second screw rod, a second rotating nut and a second motor, the outer ring of the second rotating nut is fixedly installed on the first lifting platform, the second screw rod passes through the first lifting platform and is in screw connection with the inner ring of the second rotating nut, and the second motor is fixedly arranged on the first lifting platform and is in transmission connection with the inner ring of the second rotating nut through a second transmission assembly, so that the second lifting platform is driven to move close to or away from the first lifting platform by driving the inner ring of the second rotating nut to rotate.

2. The lift platform of claim 1, wherein, The first lifting platform is vertically installed on the base frame; The first driving part includes a first screw rod, a first rotating nut and a first motor, the bottom end of the first screw rod is fixedly connected with the base frame, the first screw rod and the second screw rod are arranged in a staggered mode in a horizontal plane, the outer ring of the first rotating nut is fixedly connected with the first lifting platform, and the first motor is fixedly arranged on the first lifting platform and is in transmission connection with the inner ring of the first rotating nut through a first transmission assembly, so that the first lifting platform is driven to move up and down along the first screw rod by driving the inner ring of the first rotating nut to rotate.

3. The lift platform of claim 2, wherein, The first driving part includes two groups of the first screw rod and the first rotating nut, and / or the second driving device includes two groups of the first screw rod and the second rotating nut, and The first transmission assembly includes a first transmission belt, the first transmission belt is arranged between the inner rings of the two first rotating nuts and the output end of the first motor and is in transmission connection with the three, so that the first motor and the two first rotating nuts are in transmission connection; and / or The second transmission assembly includes a second transmission belt, the second transmission belt is arranged between the inner rings of the two second rotating nuts and the output end of the second motor and is in transmission connection with the three, so that the second motor and the two second rotating nuts are in transmission connection.

4. The lift platform of claim 3, wherein, The vertical central sections of the first lifting platform and the second lifting platform coincide, a plurality of groups of the first screw rod and a plurality of groups of the second screw rod are arranged in the same vertical central section, and the first rotating nut and the second rotating nut are installed at different heights on the first lifting platform.

5. The lift platform of claim 4, wherein, The first motor and the second motor are arranged on the two sides of the first lifting platform, and the installation positions of the two are symmetrical relative to the vertical installation surface.

6. The lift platform of claim 3, wherein, A plurality of first guide rods are fixedly arranged on the base frame in a vertical mode, and a first linear bearing is fixedly arranged on the first lifting platform and is in sliding sleeve connection with the first guide rods; The second lifting platform is fixed with a plurality of second guide rods arranged vertically, and the first lifting platform is provided with second linear bearings which are in sliding sleeve connection with the second guide rods.

7. The lift platform of claim 6, wherein, Each of the first lead screws is provided with a first guide rod on each side and symmetrically with each other, and the two groups of first lead screws and the first guide rods on their two sides are symmetrically arranged with each other. Each of the second lead screws is provided with a second guide rod on each side and symmetrically with each other, and the two groups of second lead screws and the second guide rods on their two sides are symmetrically arranged with each other.

8. The lift platform of claim 1, wherein, A shroud is arranged around the periphery of the top surface of the second lifting platform and the bottom of the base frame, and the shroud is arranged in an extending and retracting manner in the vertical direction.

9. The lift platform of claim 1, wherein, The base frame and the first lifting platform are both provided with grating rulers, and the two grating rulers are respectively used for detecting a first relative height of the first lifting platform relative to the base frame and a second relative height of the second lifting platform relative to the first lifting platform.

10. The lift platform of claim 9, wherein, The control device is in electrical signal connection with the grating rulers and the first driving assembly and the second driving assembly, and is used for sending an operation signal to one or both of the first driving assembly and the second driving assembly.

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