Rear-driven telescopic table device

Abstract

A rear-driven telescopic table apparatus, comprising: a base; the fixed tabletop part is arranged at the rear end of the base; the telescopic table top part comprises at least two groups of movable tables, the fixed table top part and the multiple groups of movable tables are arranged in a stepped state, and the movable tables can slide in the length direction of the base and are accommodated below the fixed table top part; the rear driving device comprises a rear driving mounting frame, a driving part, a winding drum mechanism and a driving chain group, and the rear driving mounting frame is arranged at the rear end of the base; the winding drum mechanism is rotationally mounted on the rear-drive mounting frame; the driving part is used for driving the winding drum mechanism to rotate; one end of the driving chain group is wound on the winding drum mechanism, and the other end is connected to the farthest movable table; and the control unit is used for regulating and controlling the running state of the rear driving device. According to the scheme, rotary motion of the winding drum mechanism can be converted into linear motion of the driving chain set, so that the multiple movable tables are driven to be pushed out and retracted, space is saved, rapid and stable power output is provided, and retracting and unfolding of the telescopic table are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grand event grandstand structure, and particularly relates to a rear drive telescopic stand device. BACKGROUND

[0002] Large telescopic stands are usually used in sports events, concerts and other public gathering occasions. These grandstands need to have stability and safety, and adapt to different site and activity requirements. In large event sites, telescopic stands are widely used, and need to have the ability of quick arrangement, adjustment and withdrawal, and can be adjusted in length, height or size according to actual requirements to adapt to different site and activity requirements. It is usually composed of multiple telescopic parts, which can be telescoped or contracted when needed. Large telescopic stands have a wide range of applications in many fields, such as bridge construction, entertainment industry and sports events.

[0003] The existing traditional telescopic stand adopts front drive trolley unit for driving, which not only occupies more space, limits the design flexibility of the grandstand, but also has complex maintenance and high operation cost, and has insufficient stability on uneven ground, is easy to deviate, and the front structure needs to increase counterweight, resulting in uneven weight distribution of the driving unit front and back, so that the overall telescopic stand device is not stable enough. CONTENT OF THE INVENTION

[0004] The present application provides a rear drive telescopic stand device for improving the stability and operation efficiency of the telescopic stand device as a whole.

[0005] According to the present application, a rear drive telescopic stand device is provided in one embodiment, comprising:

[0006] A base is arranged on the installation plane of the telescopic stand device;

[0007] A fixed platform part is arranged at the rear end of the base and is relatively fixed with the base;

[0008] A telescopic platform part comprises at least two groups of movable platforms, the fixed platform part and the groups of movable platforms are arranged in a stepped state, and the movable platforms can slide along the length direction of the base and be accommodated below the fixed platform part;

[0009] A rear drive device comprises a rear drive mounting frame, a driving part, a winding drum mechanism and a driving chain set, the rear drive mounting frame is arranged at the rear end of the base and is relatively fixed with the fixed platform part; the winding drum mechanism is rotatably installed on the rear drive mounting frame, and the driving part is used to drive the winding drum mechanism to rotate; one end of the driving chain set is wound on the winding drum mechanism, and the other end of the driving chain set is connected to the farthest movable platform, so as to convert the rotary motion of the winding drum mechanism into the linear motion of the driving chain set;

[0010] and a control unit for regulating the operating state of the rear driving device.

[0011] In another embodiment, the winding mechanism comprises a driving shaft, long rod plates and two winding side plates, the driving shaft is arranged through the two winding side plates, the long rod plates are connected to the two winding side plates respectively at two ends, the long rod plates are provided with at least two, and the long rod plates are symmetrically distributed about the driving shaft, so that the driving chain group is wound outside the long rod plates.

[0012] In another embodiment, the driving chain group comprises a plurality of driving chain links connected in sequence, and the driving chain links are arranged as rigid chains, and any driving chain link is used for clamping between two adjacent long rod plates.

[0013] In another embodiment, the driving chain links are respectively provided with first and second hinge parts at two ends, and the first and second hinge parts are connected through a hinge shaft.

[0014] In another embodiment, the bottom of the driving chain link is provided with a caster, and the rotation axis of the caster is horizontal and perpendicular to the length direction of the driving chain link.

[0015] In another embodiment, the driving chain group is spirally wound on the winding mechanism, and the length direction of the driving chain group is arranged at a non-zero angle with the length direction of the base.

[0016] In another embodiment, the driving chain link is provided with a pushing part, and the long rod plate is provided with a clamping groove matched with the clamping position of the pushing part, so that the long rod plate pushes the driving chain link to expand or wind.

[0017] In another embodiment, the rear driving device further comprises a driving sprocket, a driven sprocket and a sprocket chain, the driving sprocket is coaxially installed on the output shaft of the driving member, the driven sprocket is coaxially installed on the driving shaft, the sprocket chain is engaged with the driving sprocket and the driven sprocket for synchronous transmission, and the diameter of the driven sprocket is greater than that of the driving sprocket.

[0018] In another embodiment, the movable table comprises a telescopic platform, a platform support frame, a walking wheel frame and a supporting wheel frame installed on the platform support frame, the platform support frame is used for supporting the telescopic platform, and the walking wheel frame and the supporting wheel frame are both provided with rollers; the walking wheel frame is arranged below the telescopic platform and is used for walking on the ground, and the supporting wheel frame is arranged above the telescopic platform and is used for walking on the upper movable table.

[0019] In another embodiment, when the device is retracted, the walking wheel frame of the proximal movable platform of the base is in the retraction path of the platform support frame of the distal movable platform, so that the distal movable platform drives the proximal movable platform to retract; when the device is deployed, the telescopic platform of the proximal movable platform of the base is in the deployment path of the platform support frame of the distal movable platform, so that the distal movable platform drives the proximal movable platform to deploy.

[0020] According to the rear-driven telescopic platform device of the above embodiment, the rear drive device drives the winding drum mechanism to rotate through the driving member, converts the rotary motion of the winding drum mechanism into the linear motion of the drive chain set, and drives the multiple movable platforms to retract and deploy; the rear drive device does not occupy the space of the telescopic platform at the front end and further saves space through the winding design; the multiple movable platforms are retracted from the front end to the rear end through the drive chain set, providing fast and stable power output, which is beneficial to the overall retraction and deployment of the telescopic platform device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the rear-driven telescopic platform device in the deployed state.

[0022] Figure 2 It is a schematic diagram of the overall structure of the rear-driven telescopic platform device in the retracted state.

[0023] Figure 3 It is a schematic diagram of the overall structure of the rear drive device in one embodiment.

[0024] Figure 4 It is a schematic diagram of the structure of the winding drum mechanism in another embodiment.

[0025] Figure 5 It is a sectional view of the winding drum mechanism in another embodiment.

[0026] Figure 6 It is a top view of the rear drive device in another embodiment.

[0027] Figure 7 It is a schematic diagram of the structure of the drive chain link in another embodiment.

[0028] Figure 8 It is a side view of the rear-driven telescopic platform device in another embodiment.

[0029] REFERENCE NUMERALS:

[0030] 1, base;

[0031] 2, fixed platform part; 21, fixed platform;

[0032] 3, telescopic table top part; 31, movable table; 311, telescopic platform; 312, platform support frame; 3121, support rod; 3122, trigger rod; 313, walking wheel frame; 314, support wheel frame; 315, roller; 316, baffle;

[0033] 4, rear drive device; 41, rear drive mounting frame; 42, drive piece; 421, rotating motor; 422, motor reducer; 43, winding drum mechanism; 431, transmission rotating shaft; 432, long rod plate; 433, winding drum side plate; 434, rotating shaft shaft seat; 435, clamping groove; 44, drive chain set; 441, drive chain link; 442, first hinged part; 443, second hinged part; 444, castor; 445, pushing part; 45, driving sprocket; 46, driven sprocket; 47, sprocket chain; 48, drive mounting frame. DETAILED DESCRIPTION

[0034] The application will be described in further detail below with specific embodiments in conjunction with the accompanying drawings. In different embodiments, similar elements are denoted by associated similar element reference numbers. In the following embodiments, many details are described in order to make the application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the application are not shown or described in the specification in order to avoid the core part of the application being overwhelmed by too much description, and it is not necessary for those skilled in the art to describe these related operations in detail according to the description in the specification and the general technical knowledge in the art.

[0035] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing one embodiment, and do not mean that the composition and / or order is necessary.

[0036] In this paper, the serial numbers of components, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. Unless otherwise specified, "connection" and "coupling" in this application include direct and indirect connections (couplings).

[0037] Large retractable stands are usually composed of multiple retractable parts, which can be retracted or contracted when needed. The existing conventional retractable stands are driven by front drive trolley units, which not only occupy more space, limit the design flexibility of the stand, but also have complex maintenance, high operating cost, insufficient stability on uneven ground, easy deviation, and need to increase counterweight for the front structure, resulting in uneven weight distribution of the drive unit front and back, making the overall retractable stand equipment unstable.

[0038] The application discloses a rear drive retractable stand equipment, which enhances the load-bearing capacity and stability of the stand through rigid chain design, and improves operation efficiency through fast response rotating motor 421 drive.

[0039] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a rear drive retractable stand equipment, comprising: a base 1 arranged on the installation plane of the retractable stand equipment; a fixed deck part 2 arranged at the rear end of the base 1 and kept relatively fixed with the base 1; a retractable deck part 3 comprising at least two groups of movable decks 31, the fixed deck part 2 and the groups of movable decks 31 are arranged in a stepped state, and the movable decks 31 can slide along the length direction of the base 1 and be accommodated below the fixed deck part 2; a rear drive device 4 comprising a rear drive mounting frame 41, a drive member 42, a winding drum mechanism 43 and a drive chain set 44, the rear drive mounting frame 41 is arranged at the rear end of the base 1 and kept relatively fixed with the fixed deck part 2; the winding drum mechanism 43 is rotatably installed on the rear drive mounting frame 41, the drive member 42 is used to drive the winding drum mechanism 43 to rotate; one end of the drive chain set 44 is wound on the winding drum mechanism 43, and the other end of the drive chain set 44 is connected to the farthest movable deck 31, so as to convert the rotary motion of the winding drum mechanism 43 into the linear motion of the drive chain set 44; and a control unit for regulating the operating state of the rear drive device 4.

[0040] In the embodiment, the rear drive device 4 drives the winding drum mechanism 43 to rotate through the drive member 42, converts the rotary motion of the winding drum mechanism 43 into the linear motion of the drive chain set 44, and drives the multiple movable decks 31 to push out and retract; it does not occupy the space of the retractable stand at the front end and further saves space through winding design; the multiple movable decks 31 are retracted from the front end to the rear end through the drive chain set 44, providing fast and stable power output, so that the overall retracting and unfolding of the retractable stand equipment is more stable and efficient.

[0041] Specifically, please refer to Figure 3 and Figure 4, the winding drum mechanism 43 comprises a transmission rotating shaft 431, a long rod metal plate 432 and two winding drum side plates 433, the rear drive mounting frame 41 is provided as a square frame, a rotating shaft shaft seat 434 is fixed on the rear drive mounting frame 41, and the transmission rotating shaft 431 is horizontal and perpendicular to the stretching direction of the device; the transmission rotating shaft 431 penetrates through the two winding drum side plates 433, and the transmission rotating shaft 431 is rotationally connected to the rear drive mounting frame 41 through the rotating shaft shaft seat 434 at both ends; the two winding drum side plates 433 are parallel, and the long rod metal plate 432 is connected to the two winding drum side plates 433 at both ends, the long rod metal plate 432 is provided with at least two, and the plurality of long rod metal plates 432 are symmetrically distributed about the transmission rotating shaft 431, so that the drive chain set 44 is wound outside the plurality of long rod metal plates 432.

[0042] In the embodiment, please refer to Figure 4 and Figure 5 , the long rod metal plate 432 is provided with four, the four long rod metal plates 432 are symmetrically distributed in a square shape about the transmission rotating shaft 431, that is, the four long rod metal plates 432 are on the same circumferential edge; the winding drum side plate 433 can adopt a steel plate, the center is provided with a hole for mounting and fixing the transmission rotating shaft 431, the rotating shaft shaft seat 434 can adopt a tapered roller bearing to connect and fix the transmission rotating shaft 431, and the rotating shaft shaft seat 434 can be filled with lithium-based lubricating grease to reduce the rotating resistance.

[0043] Further, please refer to Figure 4 , the rear drive device 4 further comprises a driving sprocket 45, a driven sprocket 46 and a sprocket chain 47, the driving mounting frame 48 is fixed on the upper end of the rear drive support frame through screw and nut cooperation, and the driving mounting frame 48 is used for mounting and fixing the driving member 42; in the embodiment, the driving member 42 comprises a rotating motor 421 and a motor reducer 422, the output shaft of the rotating motor 421 is coaxially connected to the input shaft of the motor reducer 422; the driving sprocket 45 is coaxially installed on the output shaft of the motor reducer 422, the driven sprocket 46 is coaxially installed on the transmission rotating shaft 431, the sprocket chain 47 is sleeved and engaged with the driving sprocket 45 and the driven sprocket 46 for synchronous transmission, and the diameter of the driven sprocket 46 is greater than that of the driving sprocket 45.

[0044] In the embodiment, the shaft hole cooperation can adopt welding fixation or key connection and the like, such as the connection between the driven sprocket 46 and the transmission rotating shaft 431, the coaxial connection can adopt a shaft coupling, such as the connection between the rotating motor 421 and the motor reducer 422.

[0045] Further, please refer to Figure 6 and Figure 7, the driving chain group 44 is spirally arranged on the winding drum mechanism 43, and the length direction of the driving chain group 44 is arranged at a non-zero angle with the length direction of the base 1. The length direction of the base 1 is the telescopic direction of the telescopic table, the driving chain group 44 includes a plurality of driving chain links 441 which are sequentially hinged, and the driving chain links 441 are arranged as rigid chains. The rear end driving chain link 441 is fixed on any long rod plate 432 through welding or bolt-nut cooperation, and the front end driving chain link 441 is used for connecting the movable table 31. When the driving chain link 441 is wound, any driving chain link 441 is clamped between the adjacent two long rod plates 432, and the adjacent driving chain links 441 are bent at 90 degrees to ensure that the winding is compact and the stress is uniform.

[0046] Please refer to Figure 4 , Figure 5 and Figure 7 , the first hinge part 442 and the second hinge part 443 are arranged at the two ends of the driving chain link 441 respectively, the first hinge part 442 and the second hinge part 443 are connected through a hinge shaft to realize the connection between the driving chain links 441, and the plurality of driving chain links 441 are arranged on the winding drum mechanism 43 through the hinge. The first hinge part 442 is arranged at the front end of the driving chain link 441, and the second hinge part 443 is arranged at the rear end of the driving chain link 441.

[0047] Please refer to Figure 5 and Figure 7 , in the embodiment, the free front end of the driving chain link 441 is retracted or unfolded from the side of the winding drum mechanism 43 close to the ground. In the embodiment, the driving chain link 441 adopts a channel steel, which has low cost. The notch of the driving chain link 441 is arranged downward and a caster 444 is arranged in the notch. The caster 444 reduces the friction of the base 1 and ensures that the pushing force is efficiently transmitted to the movable table 31. The rotating shaft of the caster 444 is horizontal and perpendicular to the length direction of the driving chain link 441. The number of the casters 444 can be designed and adjusted according to the length of the driving chain link 441 and the use scene.

[0048] Please refer to Figure 5 and Figure 7 , the rear end of the driving chain link 441 is provided with a pushing part 445, and the long rod plate 432 is provided with a clamping groove 435 matched with the clamping part 445 to make the long rod plate 432 push the driving chain link 441 to unfold or wind. Specifically, in the embodiment, the pushing part 445 is arranged as an L-shaped, and the cross section of the long rod plate 432 is also arranged as an L-shaped to form the corresponding clamping groove 435, and both can be formed by cutting angle steel. One side of the pushing part 445 is welded and fixed on the upper end of the driving chain link 441, and the other vertical side of the pushing part 445 is vertically erected relative to the driving chain. In the process of retracting or unfolding the driving chain link 441, the panel of the pushing part 445 which is vertically erected is pushed through the clamping groove 435 of the angle steel to realize the smooth pushing out and retracting of the driving chain link 441.

[0049] In this embodiment, the telescopic stand device is driven by a rotating motor 421, which can increase the output torque through a motor reducer 422 and a chain wheel and chain 47 mechanism. The driving chain set 44 is pushed out by the drum mechanism 43, which requires force to be transmitted by the rotating motor 421 to the motor reducer 422 for the first reduction, and then to the chain wheel and chain 47 mechanism for the second reduction, and finally to the driving chain set 44. When the telescopic stand is unfolded, the rear drive drum rotates forward (in this embodiment, the specific design can be based on the application environment), and the long lever sheet metal 432 of the drum mechanism 43 sequentially pushes the abutting part 445 on any driving chain link 441 and pushes it out; when the telescopic stand is retracted, the rear drive drum reverses, and the long lever sheet metal 432 of the drum mechanism 43 sequentially pushes the abutting part 445 on any driving chain link 441 and retracts it.

[0050] The technical solution of the present application: through the rigid chain design, the bearing capacity and stability of the stand are enhanced, the safe use under various site conditions is ensured, the operation efficiency is improved, the telescopic stand is quickly unfolded and retracted through the quick response of the rotating motor 421, the maintenance cost is reduced, the complex activity driving installation is reduced, and the maintenance complexity and cost are reduced; the space utilization is optimized, the site space is maximized, and the activity demand of different scales and layouts is adapted.

[0051] Further, please refer to Figure 1 , Figure 2 and Figure 8 , the fixed table part 2 includes at least one set of fixed tables 21 arranged in a stepped structure, the bottom 1 is fixed to the telescopic stand device installation plane, and can be fixed to the ground or set a bottom plate and connected with the telescopic stand device as a whole. The upper end of the bottom 1 is set as a corresponding stepped structure according to the structure, number and stepped height of the fixed tables 21, and is supported and fixed at the lower end of the fixed tables 21.

[0052] Further, please refer to Figure 2 and Figure 8 , the movable table 31 includes a telescopic platform 311, a platform support frame 312, a walking wheel frame 313 and a support wheel frame 314 installed on the platform support frame 312, the platform support frame 312 is used to support the telescopic platform 311, and the walking wheel frame 313 and the support wheel frame 314 are provided with rollers 315; the walking wheel frame 313 is arranged below the telescopic platform 311 and is used to walk along the ground, and the support wheel frame 314 is arranged above the telescopic platform 311 and is used to walk along the upper movable table 31.

[0053] Please refer to Figure 1 , Figure 2 and Figure 8, the platform support frame 312 includes a support rod 3121 at the lower end of the telescopic platform 311 and a trigger rod 3122 at the upper end of the telescopic platform 311, the trigger rod 3122 is horizontal and perpendicular to the retracting direction of the telescopic platform, specifically, the trigger rod 3122 is arranged at the rear end of the telescopic platform 311, the front end of the telescopic platform 311 is bent downward to form a baffle 316, and the baffle 316 of the upper telescopic platform 311 overlaps the trigger rod 3122 of the lower telescopic platform 311 in the height direction. When the device is unfolded, the telescopic platform 311 of the proximal movable table 31 of the base 1 is in the unfolding path of the platform support frame 312 of the distal movable table 31, and the most distal movable table 31 of the base 1 is the lowest layer, when it is unfolded, the trigger rod 3122 of the telescopic platform 311 drives the baffle 316 of the telescopic platform 311 of the next higher layer to continue to unfold, realizing the mechanical linkage of “pushing far, pushing in the middle, and pushing near”, without the need for additional driving devices.

[0054] Please refer to Figure 1 , Figure 2 and Figure 8 , the walking wheel frame 313 is fixed on the trigger rod 3122, the walking wheel frame 313 of the upper telescopic platform 311 overlaps the trigger rod 3122 of the lower telescopic platform 311 in the height direction, the most distal movable table 31 of the base 1 is the lowest layer, and the driving chain group 44 is connected to the walking wheel frame 313 of the most distal movable table 31; when the device is retracted, the walking wheel frame 313 of the proximal movable table 31 of the base 1 is in the retracting path of the platform support frame 312 of the distal movable table 31, that is, when it is retracted, the most distal walking wheel frame 313 and the trigger rod 3122 drive the walking wheel frame 313 of the telescopic platform 311 of the next higher layer to continue to retract, realizing the mechanical linkage of “pushing far, pushing in the middle, and pushing near”, and stacking all telescopic tables under the fixed table surface part 2.

[0055] In this embodiment, the rear driving device 4 is modularly designed, and the rear driving support frame is detachably installed at the rear end of the base 1 by bolts.

[0056] Further, the control unit comprises an encoder arranged on the output shaft of the rotating motor 421, for feeding the rotating speed and position signals to the control unit in real time, forming a closed-loop control; in other embodiments, the control unit can also increase remote control, overload protection, emergency stop and other functions, the overload protection function can be realized and controlled by the torque limiter and the clutch device, when the moving resistance of the telescopic table top exceeds the preset threshold, the power transmission is automatically cut off. The emergency stop function can be realized by the remote control device, the emergency button and the brake module, in the embodiment of the application, two emergency buttons can be arranged, and the exposed parts of the remote control device and the surface of the base 1 are arranged respectively, the brake module is connected with the driving part 42, double protection, the operator can stop the adjusting device at the device placement position or the remote control position, after the emergency button is triggered, the output shaft of the rotating motor 421 is immediately locked by the brake module, the emergency stop is realized, and the specific design can be designed according to the actual situation, which is not described here.

[0057] The above application of specific examples is used to describe the utility model, which is only used to help understand the utility model, and does not limit the utility model. For the skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A retractable stage apparatus driven in the rear, characterized by, The utility model relates to a telescopic table device, including: a base (1) arranged on a telescopic table device installation plane; a fixed table top (2) arranged at the rear end of the base (1) and kept relatively fixed with the base (1); a telescopic table top (3) including at least two groups of movable tables (31), the fixed table top (2) and the groups of movable tables (31) are arranged in a stepped state, and the movable tables (31) can slide along the length direction of the base (1) and be accommodated below the fixed table top (2); a rear drive device (4) including a rear drive mounting frame (41), a driving member (42), a winding drum mechanism (43) and a driving chain set (44), the rear drive mounting frame (41) is arranged at the rear end of the base (1) and kept relatively fixed with the fixed table top (2); the winding drum mechanism (43) is rotatably arranged on the rear drive mounting frame (41), the driving member (42) is used to drive the winding drum mechanism (43) to rotate; one end of the driving chain set (44) is arranged on the winding drum mechanism (43), and the other end of the driving chain set (44) is connected to the farthest movable table (31), so that the rotary motion of the winding drum mechanism (43) is converted into the linear motion of the driving chain set (44); and a control unit for regulating the operating state of the rear drive device (4).

2. The retractable stage apparatus of claim 1, wherein, The winding drum mechanism (43) includes a transmission shaft (431), a long rod plate (432) and two winding drum side plates (433), the transmission shaft (431) passes through the two winding drum side plates (433), the long rod plate (432) is connected to the two winding drum side plates (433) at both ends respectively, there are at least two long rod plates (432), and the long rod plates (432) are symmetrically distributed about the transmission shaft (431), so that the driving chain set (44) is wound outside the long rod plates (432).

3. The retractable stage apparatus of claim 2, wherein, The driving chain set (44) includes a plurality of driving chain links (441) connected in sequence, and the driving chain links (441) are arranged as rigid chains, any driving chain link (441) is used for clamping between two adjacent long rod plates (432).

4. The retractable stage apparatus of claim 3, wherein, The driving chain link (441) is provided with a first hinge part (442) and a second hinge part (443) at both ends respectively, and the first hinge part (442) and the second hinge part (443) are connected through a hinge shaft.

5. The retractable stage apparatus of claim 4, wherein, The bottom of the driving chain link (441) is provided with a trundle (444), and the rotating shaft of the trundle (444) is horizontal and perpendicular to the length direction of the driving chain link (441).

6. The retractable stage apparatus of claim 3, wherein, The driving chain set (44) is spirally wound on the winding drum mechanism (43), and the length direction of the driving chain set (44) is arranged at a non-zero angle with the length direction of the base (1).

7. The retractable stage apparatus of claim 3, wherein, The driving chain link (441) is provided with a pushing part (445), and the long rod plate (432) is provided with a clamping groove (435) matched with the pushing part (445) to make the long rod plate (432) push the driving chain link (441) to expand or wind.

8. The retractable stage apparatus of claim 2, wherein, The rear drive device (4) further comprises a driving sprocket (45), a driven sprocket (46) and a sprocket chain (47), the driving sprocket (45) is coaxially installed on the output shaft of the driving member (42), the driven sprocket (46) is coaxially installed on the transmission rotating shaft (431), the sprocket chain (47) is engaged with the driving sprocket (45) and the driven sprocket (46) for synchronous transmission, and the diameter of the driven sprocket (46) is greater than that of the driving sprocket (45).

9. The retractable stage apparatus of claim 2, wherein, The movable platform (31) comprises a telescopic platform (311), a platform support frame (312), a walking wheel frame (313) and a supporting wheel frame (314) installed on the platform support frame (312), the platform support frame (312) is used for supporting the telescopic platform (311), the walking wheel frame (313) and the supporting wheel frame (314) are both provided with rollers (315), the walking wheel frame (313) is arranged below the telescopic platform (311) and is used for walking along the installation plane of the telescopic platform device, and the supporting wheel frame (314) is arranged above the telescopic platform (311) and is used for walking along the movable platform (31) on the upper layer.

10. The retractable stage apparatus of claim 9, wherein, When the device is retracted, the walking wheel frame (313) of the proximal movable platform (31) of the base (1) is on the retraction path of the platform support frame (312) of the distal movable platform (31), so that the distal movable platform (31) drives the proximal movable platform (31) to retract; when the device is deployed, the telescopic platform (311) of the proximal movable platform (31) of the base (1) is on the deployment path of the platform support frame (312) of the distal movable platform (31), so that the distal movable platform (31) drives the proximal movable platform (31) to deploy.

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