A left-middle-right multi-layer orchestra pool lifting platform based on a flexible rack driving device

Abstract

The utility model provides a left and right multilayer orchestra pit lifting platform based on flexible rack driving device relates to stage equipment technical field, and the device includes support frame, left and right three layers independent lifting platform, flexible rack lifting device, vertical guide device, drive motor assembly, platform steel structure and electrical control system. The flexible rack lifting device is by modular flexible rack, drive gear, back wheel, gear meshing box and rack storage box composition, and the flexible rack one end rigid connection platform steel structure, the other end is fixed in support frame, realizes 2.4m stroke lifting. The lifting platform is driven by independent speed reducer, and according to sensor feedback signal, the controller system controls single layer independent operation or three layers linkage operation. The device solves the problem of rigid rack wear and hydraulic oil leakage, and the depth of foundation pit is only 1.5m, and long stroke accurate transmission is realized through modular rack structure, so that the demand of stage expansion, audience seat expansion and orchestra conversion is met.

Description

Technical Field

[0001] This utility model relates to the field of stage equipment technology, and more specifically, to a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device. Background Technology

[0002] In modern large-scale performance venues, orchestra pit lifts are key equipment for adjusting the height and layout of the orchestra pit. They enable the switching of the orchestra pit platform with the stage plane, the first row of seats in the auditorium, the performance platform, and the seating area, providing diverse spaces for orchestral performances and choral performances. Currently, traditional orchestra pit lifts mainly use rigid rack and pinion drives or hydraulic drives. Rigid rack and pinion drives, due to limitations in geometric characteristics and material mechanical properties, are difficult to adapt to complex stage space layouts and multi-layer coordinated lifting requirements. Their transmission flexibility is insufficient, and positioning accuracy deviations are significant, especially in irregular layouts where nonlinear errors in motion transmission are difficult to control. At the same time, the meshing parts of the rack and pinion are subjected to alternating stress for a long time, which easily leads to wear on the gear teeth and transmission jamming, seriously affecting the stability and service life of the equipment. Hydraulic drive systems have high maintenance costs, are prone to oil leaks that pollute the environment, and have slow response speeds, failing to meet the demands of rapid lifting performances. Existing orchestra pit lifts lack effective linkage and independent control mechanisms in multi-layer layouts (left, center, right), making them difficult to adapt to diverse performance scenarios. In addition, rack and pinion drives are only suitable for short-stroke lifting platforms and require a deeper pit; chain drives require the sprockets to be arranged at a high position, which is easily exposed to the audience's line of sight and affects the viewing experience.

[0003] Therefore, there is an urgent need to develop a new type of orchestra pit lifting platform to solve problems such as insufficient transmission flexibility, low control precision, high maintenance cost, poor spatial adaptability and lack of multi-layer collaborative control, while achieving compatibility between shallow pits and large stroke. Utility Model Content

[0004] To address the aforementioned technical problems, a multi-level orchestra pit lifting platform based on a flexible rack and pinion drive device is provided. This invention employs a flexible rack and pinion drive device, integrating a vertical guide device and electrical linkage control to achieve large-stroke lifting in shallow pits and independent / linkage control.

[0005] To achieve the above objectives, this utility model provides a left-middle-right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, comprising: a support frame, a left-layer orchestra pit lifting platform, a middle-layer orchestra pit lifting platform, a right-layer orchestra pit lifting platform, a flexible rack and pinion lifting device, a vertical guide device, a drive motor assembly, a platform steel structure, a stage wooden floor, and an electrical control system. The support frame is equipped with a vertical guide device. The left orchestra pit lifting platform, the middle orchestra pit lifting platform and the right orchestra pit lifting platform are slidably connected to the vertical guide rail of the vertical guide device through guide sliders. The steel structure of the left, middle, and right orchestra pit lifting platforms is connected to the drive motor assembly via a flexible rack and pinion lifting device. The flexible rack and pinion lifting device includes a flexible rack, a drive gear, a back wheel, a gear meshing box, a rack storage box, a transmission mechanism, and a reduction motor. The output shaft of the reduction motor is connected to the drive gear via the transmission mechanism. The drive gear meshes with the flexible rack. One end of the flexible rack is fixed to the support frame, and the other end is rigidly connected to the steel structure of the platform. The surfaces of the left orchestra pit lifting platform, the middle orchestra pit lifting platform and the right orchestra pit lifting platform are covered with stage wood flooring. The electrical control system includes a controller system, a sensor group, an operation panel, and an output module, which are used to independently or in conjunction with other systems to control the lifting of the three-layer lifting platform.

[0006] Furthermore, the flexible rack is a symmetrically arranged U-shaped cross-section structure, which is assembled from 20 rack blocks through connecting plates, connecting pins and connecting bolts.

[0007] Furthermore, in the electrical control system: The sensor group includes a displacement sensor, a pressure sensor, and a velocity sensor; The controller system controls the operation of the drive motor assembly based on the feedback signals from the sensor group, thereby achieving independent or coordinated control of the left orchestra pit lifting platform, the middle orchestra pit lifting platform, and the right orchestra pit lifting platform. The operation panel is equipped with independent control buttons and a linkage mode button, and supports inputting target height, speed and direction commands.

[0008] Furthermore, it also includes safety devices, which include a load sensor, a position sensor, a limit switch, and an anti-shear protection device, electrically connected to the controller system to achieve overload protection and limit position detection.

[0009] Furthermore, the steel structure of the platform adopts a steel truss and a solid web beam.

[0010] Furthermore, the stage wood flooring, including wood joists, plywood, and Oregon pine veneer panels, is rigidly connected to the stage steel structure via elastic pads.

[0011] Furthermore, the vertical guide device includes a vertical track and a guide slider, which restricts the lifting platform to move only in the vertical direction.

[0012] Furthermore, the edges of the left, middle, and right orchestra pit lifting platforms are all equipped with orchestra pit lifting railings, and the surfaces are covered with anti-slip and wear-resistant materials.

[0013] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model provides a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device. By adopting a modular flexible rack and pinion lifting device, and using U-shaped cross-section rack blocks for segmented support, it achieves large-stroke lifting, avoids the problem of wear and jamming of rigid racks, and improves transmission accuracy and equipment life.

[0014] 2. This utility model provides a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device. Through independent drive motor components combined with an electrical control system, it realizes independent control and linkage operation of the left, middle and right three-layer lifting platforms, meeting the needs of diverse performance scenarios such as stage expansion, audience seating expansion, and band performance.

[0015] 3. This utility model provides a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device. The modular structure of the lifting platform facilitates disassembly and maintenance. Combined with the anti-slip and wear-resistant layer of the stage wooden floor and the edge orchestra pit lifting railings, personnel safety is ensured. The safety device avoids operational accidents through real-time overload detection and limit protection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 2 This is a front view of a flexible rack and pinion lifting device for a left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 3 This is a three-dimensional structural diagram of a flexible rack and pinion lifting device for a left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 4 This is an installation diagram of a flexible rack and pinion lifting device for a left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 5 This is a schematic diagram of the structure of a multi-layered orchestra pit lifting platform stage wooden floor based on a flexible rack and pinion drive device, as described in this utility model. Figure 6 This is a schematic diagram of the steel structure of the left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 7This is a schematic diagram of a flexible rack structure for a left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack drive device, as described in this utility model. Figure 8 This is a schematic diagram of the electrical control system for a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model. Figure 9 This is a three-dimensional schematic diagram of the overall structure of the left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device described in this utility model; Figure 10 This is a schematic diagram of the first mode of a left-middle-right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device according to this utility model; Figure 11 This is a schematic diagram of the second mode of a left-center-right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device according to this utility model; Figure 12 This is a schematic diagram of the third mode of a multi-layered orchestra pit lifting platform based on a flexible rack and pinion drive device, as described in this utility model.

[0018] In the diagram: 1. Left orchestra pit lifting platform; 2. Middle orchestra pit lifting platform; 3. Right orchestra pit lifting platform; 4. Support frame; 5. Flexible rack and pinion lifting device; 51. Flexible rack; 52. Drive gear; 53. Back wheel; 54. Gearbox; 55. Rack storage box; 56. Transmission mechanism; 57. Gear motor; 6. Vertical guide device; 7. Drive motor assembly; 8. Stage steel structure; 81. Steel truss; 82. Solid web beam; 9. Stage wooden floor; 91. Wooden joists; 92. High-quality plywood; 93. Oregon pine veneer panel; 94. Elastic pad; 10. Electrical control system; 101. Controller system; 102. Sensor group; 103. Operation panel; 104. Output module; 11. Safety device; 12. Main stage; 13. Orchestra pit lifting railing; 14. Stage; 15. Audience seating; 16. Foundation pit; 17. Orchestra. Detailed Implementation

[0019] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0026] like Figures 1 to 12 As shown, this utility model provides a left, middle and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device, including: a support frame 4, a left orchestra pit lifting platform 1, a middle orchestra pit lifting platform 2, a right orchestra pit lifting platform 3, a flexible rack and pinion lifting device 5, a vertical guide device 6, a drive motor assembly 7, a platform steel structure 8, a stage wooden floor 9 and an electrical control system 10. like Figure 1 As shown, the support frame 4 is made of high-strength metal material and is equipped with a vertical guide device 6 inside. The vertical guide device 6 includes a vertical rail and a guide slider. The left orchestra pit lifting platform 1, the middle orchestra pit lifting platform 2 and the right orchestra pit lifting platform 3 are slidably connected to the vertical guide rail of the vertical guide device 6 through the guide slider, so as to ensure that the movement is only in the vertical direction during the lifting process. The steel structure 8 of the left orchestra pit lifting platform 1, the middle orchestra pit lifting platform 2, and the right orchestra pit lifting platform 3 are all connected to the drive motor assembly 7 via a flexible rack and pinion lifting device 5, such as... Figure 2 and Figure 3As shown, the flexible rack lifting device 5 includes a flexible rack 51, a drive gear 52, a back wheel 53, a gear meshing box 54, a rack storage box 55, a transmission mechanism 56, and a reduction motor 57. The drive gear 52 meshes with the flexible rack 51 through the gear meshing box 54. The output shaft of the reduction motor 57 drives the gear 52 to rotate through the transmission mechanism 56. The back wheel 53 assists the flexible rack 51 in running. The rack storage box 55 stores the rack portion that does not participate in the transmission. One end of the flexible rack 51 is fixed to the support frame 4, and the other end is rigidly connected to the platform steel structure 8. The flexible rack 51 is a symmetrically arranged U-shaped cross-section structure, which is assembled from 20 rack blocks through connecting plates, connecting pins and connecting bolts. When the lifting platform is at its lowest position, the height of the load-bearing rack is 565mm, and the remaining rack blocks are stored in the rack storage box 55. When the lifting platform is at its highest position, the height of the load-bearing rack is 2965mm, the stroke is 2400mm, the length of a single rack block is 175.93mm, and the U-shaped cross-section dimensions are 115mm×150mm×10mm.

[0027] like Figure 5 As shown, the surfaces of the left orchestra pit lifting platform 1, the middle orchestra pit lifting platform 2 and the right orchestra pit lifting platform 3 are covered with stage wood flooring 9. The stage wood flooring 9 consists of three layers: the bottom layer is wood joists 91, the middle layer is high-quality plywood 92, and the top layer is Oregon pine veneer panel 93. It is rigidly connected to the steel structure 8 of the orchestra pit lifting platform surface through elastic pads 94. The electrical control system 10 includes a controller system 101, a sensor group 102, an operation panel 103, and an output module 104, which are used to independently or in conjunction with the lifting of the three-layer lifting platform.

[0028] Furthermore, such as Figure 8 As shown, in the electrical control system 10: The sensor group 102 includes a displacement sensor, a pressure sensor, and a speed sensor. The displacement sensor is installed on the surface of the lifting platform, the pressure sensor is located at the connection between the support frame 4 and the platform, and the speed sensor is installed on the output shaft of the geared motor 57. It can monitor the position, load, and motor speed of the lifting platform in real time, improve positioning accuracy, and increase response speed. The controller system 101 uses a high-performance microprocessor to control the operation of the drive motor assembly 7 according to the feedback signal of the sensor group 102, so as to realize independent or linkage control of the left orchestra pit lift 1, the middle orchestra pit lift 2 and the right orchestra pit lift 3, and the independent control and linkage mode switching to meet the needs of rapid adjustment of the performance scene. The operation panel 103 is equipped with independent control buttons and linkage mode buttons, and supports inputting target height, speed and direction commands.

[0029] Furthermore, it also includes a safety device 11, which includes a load sensor, a position sensor, a limit switch, and an anti-shear protection device. It is electrically connected to the controller system 101 to realize overload protection and limit position detection. The multi-level protection mechanism reduces the failure rate and ensures the safe operation of the lifting platform. The controller system 101 receives and processes sensor signals in real time and stops the machine in a short time in an emergency.

[0030] Furthermore, such as Figure 6 As shown, the platform steel structure 8 adopts a steel truss 81 and a solid web beam 82, and the design static load of the platform steel structure 8 is 5kN / m. 2 The dynamic load is 2.5 kN / m. 2 In terms of stiffness design, static load should be used as the design load for calculation. When subjected to static load, the maximum allowable deflection of the platform steel structure 8 shall not exceed 1 / 750 of the platform beam span, and the calculated deflection shall not exceed 15mm. The stress distribution of the steel truss 81 and the solid web beam 82 is optimized to reduce vibration transmission and improve the stability of the lifting platform.

[0031] Furthermore, the edges of the left orchestra pit lifting platform 1, the middle orchestra pit lifting platform 2, and the right orchestra pit lifting platform 3 are all equipped with orchestra pit lifting railings 13, the surfaces of which are covered with anti-slip and wear-resistant materials, and the railing height is ≥1.1m to prevent people from falling; the friction coefficient of the anti-slip material is ≥0.6 to reduce the risk of slipping.

[0032] Furthermore, by raising and lowering the left orchestra pit lift 1, the middle orchestra pit lift 2, and the right orchestra pit lift 3, three practical usage modes can be expanded, such as... Figure 10 As shown, the first mode expands the stage area by raising the lift platform to the same height as the main stage 12, thereby increasing the usable stage area; as... Figure 11 As shown, the second mode increases the number of spectators by raising the platform to the same height as the audience seating area; for example... Figure 12 As shown, the third mode is to form an orchestra pit, which involves lowering the platform below the audience seating height. The height can be freely set according to the actual situation to form an orchestra pit for the band to use.

[0033] The working process of this utility model: The supporting frame 4 serves as the basic structure, and its interior is equipped with a vertical guide device 6, a vertical track, and guide sliders. The left orchestra pit lifting platform 1, the middle orchestra pit lifting platform 2, and the right orchestra pit lifting platform 3 are slidably connected to the vertical track via guide sliders, ensuring that the movement during lifting is only in the vertical direction. The flexible rack and pinion lifting device 5 is assembled from 20 flexible racks 51 with symmetrical U-shaped cross sections via connecting plates, connecting pins, and bolts. One end of the rack is rigidly connected to the base of the supporting frame 4 via a gear meshing box 54, and the other end is rigidly connected to the platform steel structure 8. The output shaft of the geared motor 57 drives the drive gear 52 to rotate via a transmission mechanism 56. The drive gear 52 meshes with the flexible racks 51, and the back wheel 53 assists the flexible racks 51 to run smoothly. The rack storage box 55 stores the rack parts that are not involved in the transmission. In the electrical control system 10, the controller system 101 monitors the position, load pressure, and motor speed of the lifting platform in real time through displacement sensors, pressure sensors, and speed sensors. After inputting the target height, speed, and direction commands into the operation panel 103, the controller controls the drive motor assembly 7 to operate based on the sensor feedback data, realizing independent control or linkage operation of the three-layer lifting platform. The load sensor, limit switch, and anti-shear protection device in the safety device 11 are electrically connected to the controller. When an overload is detected or the limit position is reached, the controller immediately triggers the reduction motor 57 to stop, ensuring operational safety. The platform steel structure 8 adopts a steel truss 81 or solid web beam 82 structure, with three layers of stage wood flooring 9 laid on the surface and rigidly connected by elastic pads 94. The edges are equipped with orchestra pit lifting railings 13 and anti-slip and wear-resistant materials to ensure personnel safety and usability. The entire system achieves efficient, stable, and multi-scenario collaborative operation of the left, middle, and right orchestra pit lifting platforms through the flexible transmission of the flexible rack 51, the precise positioning of the vertical guide device 6, and the intelligent adjustment of the electrical control system 10.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-layered orchestra pit lifting platform based on a flexible rack and pinion drive device, characterized in that, include: Left orchestra pit lifting platform (1), middle orchestra pit lifting platform (2), right orchestra pit lifting platform (3), support frame (4), flexible rack and pinion lifting device (5), vertical guide device (6), drive motor assembly (7), platform steel structure (8), stage wooden floor (9), electrical control system (10) and safety device (11). The support frame (4) is equipped with a vertical guide device (6). The left orchestra pit lifting platform (1), the middle orchestra pit lifting platform (2) and the right orchestra pit lifting platform (3) are slidably connected to the vertical guide rail of the vertical guide device (6) through guide sliders. The steel structure (8) of the left orchestra pit lifting platform (1), the middle orchestra pit lifting platform (2) and the right orchestra pit lifting platform (3) are all connected to the drive motor assembly (7) through a flexible rack lifting device (5). The flexible rack lifting device (5) includes a flexible rack (51), a drive gear (52), a back wheel (53), a gear meshing box (54), a rack storage box (55), a transmission mechanism (56) and a reduction motor (57). The output shaft of the reduction motor (57) is connected to the drive gear (52) through the transmission mechanism (56). The drive gear (52) meshes with the flexible rack (51). One end of the flexible rack (51) is fixed to the support frame (4), and the other end is rigidly connected to the steel structure (8) of the platform. The flexible rack (51) is a symmetrically arranged U-shaped cross-section structure, which is assembled from 20 rack blocks by connecting plates, connecting pins and connecting bolts; The surfaces of the left orchestra pit lift (1), the middle orchestra pit lift (2) and the right orchestra pit lift (3) are covered with stage wood flooring (9). The vertical guide device (6) includes a vertical track and a guide slider, which restricts the left orchestra pit lift (1), the middle orchestra pit lift (2) and the right orchestra pit lift (3) to move only in the vertical direction; The electrical control system (10) includes a controller system (101), a sensor group (102), an operation panel (103), and an output module (104), which are used to independently or in conjunction with the lifting of the three-layer lifting platform. The safety device (11) includes a load sensor, a position sensor, a limit switch and an anti-shear protection device, which are electrically connected to the controller system (101) to achieve overload protection and limit position detection.

2. The left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device according to claim 1, characterized in that, In the electrical control system (10): The sensor group (102) includes a displacement sensor, a pressure sensor, and a velocity sensor; The controller system (101) controls the operation of the drive motor assembly (7) according to the feedback signal of the sensor group (102), so as to realize the independent or linkage control of the left orchestra pit lifting platform (1), the middle orchestra pit lifting platform (2) and the right orchestra pit lifting platform (3). The operation panel (103) is equipped with independent control buttons and linkage mode buttons, and supports input of target height, speed and direction commands.

3. The left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device according to claim 1, characterized in that, The steel structure of the platform (8) adopts a steel truss (81) and a solid web beam (82).

4. The left, middle, and right multi-layer orchestra pit lifting platform based on a flexible rack and pinion drive device according to claim 1, characterized in that, The stage wood flooring (9), including wood joists (91), plywood and Oregon pine veneer panels (93), is rigidly connected to the tabletop steel structure (8) via elastic pads (94).

5. A multi-layered orchestra pit lifting platform based on a flexible rack and pinion drive device according to claim 1, characterized in that, The edges of the left orchestra pit lifting platform (1), the middle orchestra pit lifting platform (2) and the right orchestra pit lifting platform (3) are all equipped with orchestra pit lifting railings (13), and the surfaces are covered with anti-slip and wear-resistant materials.

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