A double-layer telescopic lifting platform

Abstract

The application discloses a double-layer telescopic lifting platform and belongs to the technical field of stage structures. The double-layer telescopic lifting platform comprises an upper layer platform, a lower layer platform and a jacking mechanism. The upper layer platform is provided with an upper platform surface and a plurality of stand columns. The bottom of the upper platform surface is fixedly connected with the top of the plurality of stand columns. The stand columns are connected with the first end of a chain at the position close to the bottom. The lower layer platform is provided with a lower platform surface and a plurality of fixing frames. The number of the fixing frames is the same as that of the stand columns. The fixing frames are fixed to the lower platform surface. The fixing frames are fixed with sprockets. The chain is engaged with the sprockets. The jacking mechanism is arranged below the lower platform surface and comprises a rigid chain and a power piece which are in transmission connection. The fixed position of the second end of the chain in the vertical direction is lower than that of the sprocket. The power piece drives the rigid chain to jack up the lower layer platform. The chain and the sprocket are matched to drive the upper layer platform to ascend relative to the lower layer platform. The jacking mechanism can meet the lifting requirement in a short lifting stroke, and the required depth of a foundation pit can be reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of stage structure, and relates to a double-layer telescopic lifting stage. BACKGROUND

[0002] With the continuous prosperity and development of China's economy, more and more people enrich their cultural and entertainment life through artistic evening parties, concerts, dramas, etc. Performers on the stage show dances, sing songs, perform dramas, magic, play music, etc. for the audience. The stage for carrying and transporting performers and props can be a single-layer stage or a double-layer lifting stage. Among them, the three-dimensional structure of the double-layer lifting stage can break the space structure of the stage in the same plane, and the construction of the multi-dimensional space stage can create infinite possibilities for performance.

[0003] In the related art, the double-layer lifting stage has an upper and lower stage surface as a whole, that is, the distance between the upper and lower stage surfaces with height difference in the lifting process of the lifting stage is fixed, and when arranging the stage, sufficient foundation pit depth and large height jacking are required to realize it. How to completely lift the double-layer lifting stage within a limited height range and reduce the cost of the stage has been an important standard with good application prospect in actual stage engineering. SUMMARY

[0004] To solve the above problems, the present application provides a double-layer telescopic lifting stage, which comprises: an upper stage provided with an upper stage surface and a plurality of columns, the bottom of the upper stage surface is fixedly connected with the top of the plurality of columns, and the column is connected with the first end of the chain at the position close to the bottom; a lower stage provided with a lower stage surface and a plurality of fixing frames, the number of fixing frames is the same as the number of columns, the fixing frame is fixed to the lower stage surface, the fixing frame is fixed with a sprocket, and the chain is engaged with the sprocket; a jacking mechanism arranged below the lower stage surface, comprising a rigid chain and a power member in transmission connection; the fixed position of the second end of the chain in the vertical direction is lower than the sprocket, the power member drives the rigid chain to jack up the lower stage, and the chain and the sprocket cooperate to drive the upper stage to rise relative to the lower stage.

[0005] Preferably, the double-layer telescopic lifting stage further comprises a first sliding rail vertically fixed in the foundation pit, and the edge of the lower stage is fixed with a first sliding block, and the first sliding block is slidingly connected with the first sliding rail; the second end and the jacking mechanism are respectively fixed to the bottom of the foundation pit.

[0006] In any of the above schemes, preferably, in the vertical direction, the maximum height difference between the first end and the sprocket is greater than or equal to the maximum stroke of the jacking mechanism jacking up the lower stage.

[0007] In any of the above schemes, preferably, the column is slidingly connected with the lower stage surface.

[0008] In any of the above schemes, preferably, the column is detachably connected with a positioning block, and the positioning block is detachably connected with the first end.

[0009] In any of the above solutions, preferably, the stand is provided with a second sliding block, the fixing frame is provided with a second sliding rail, the second sliding block is buckled to the second sliding rail and reciprocally moves along the second sliding rail in the vertical direction.

[0010] In any of the above solutions, preferably, the second sliding block comprises a U-shaped connecting piece and a fixing lug protruding from the bottom of the U-shaped connecting piece, the U-shaped connecting piece and the fixing lug are integrally formed; parallel two sides of the U-shaped connecting piece are provided with fixing holes, the fixing frame is provided with an oblong hole, the two fixing holes are arranged on two sides of the oblong hole and movably connect the U-shaped connecting piece and the fixing frame through a pin shaft; the fixing lug is detachably connected to the stand.

[0011] In any of the above solutions, preferably, the top end of the fixing frame is detachably fixed with two bearing seats, the bearing seats are rotatably connected with sprockets, and the maximum distance between the edges of the two sprockets is greater than the width of the fixing frame.

[0012] In any of the above solutions, preferably, the second end is connected with a fixing member, the fixing member comprises a limiting nut, a threaded rod and a positioning seat, wherein the limiting nut is fixedly connected to the second end, the threaded rod is movably connected with the limiting nut; the positioning seat is provided with an integrally formed adjusting block and a positioning support, the adjusting block is provided with a threaded hole, the upper and lower sides of the adjusting block are provided with locking nuts, the threaded rod is threadedly connected with the adjusting block and locked through the locking nuts, and the positioning support is fixed to the bottom of the foundation pit.

[0013] In any of the above solutions, preferably, the double-layer telescopic lifting platform is further provided with a base, the base is fixed to the bottom of the foundation pit, and the positioning support and the rigid chain are detachably fixed to the same base.

[0014] Through the above design, the present application can at least achieve the following beneficial effects:

[0015] The double-layer telescopic lifting platform of the present application fixes the sprocket on the lower layer platform, the sprocket is engaged with the chain, the first end of the chain is connected to the upper layer platform, the second end of the chain is fixed, the lower layer platform is jacked up through the jacking mechanism, the sprocket is lifted to drive the upper layer platform to be lifted, the length of the chain is fixed, so that the upper layer platform is lifted relative to the foundation pit at the same time as being lifted relative to the lower layer platform, the lifting stroke of the jacking mechanism is reduced, the required depth of the foundation pit is reduced, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an embodiment of the double-layer telescopic lifting platform of the present application;

[0017] Figure 2 is a structural schematic diagram of another embodiment of the double-layer telescopic lifting platform of the present application;

[0018] Figure 3 is a principle schematic diagram of the double-layer telescopic lifting platform of the present application;

[0019] Figure 4 is a partial structural schematic view of another embodiment of the double-layer telescopic lifting platform of the present application;

[0020] Figure 5 is a partial structural schematic view of another embodiment of the double-layer telescopic lifting platform of the present application;

[0021] Figure 6 is a partial structural schematic view of another embodiment of the double-layer telescopic lifting platform of the present application;

[0022] Figure 7 is a partial structural schematic view of another embodiment of the double-layer telescopic lifting platform of the present application;

[0023] Explanation of reference numerals in the drawings:

[0024] 1 - upper layer platform; 11 - upper platform surface; 12 - stand; 121 - second sliding block; 122 - positioning block; 2 - chain; 21 - first end; 22 - second end; 3 - lower layer platform; 31 - lower platform surface; 32 - fixed frame; 321 - second sliding rail; 322 - bearing seat; 4 - chain wheel; 5 - rigid chain; 6 - power member; 7 - first sliding rail; 8 - foundation pit; 9 - first sliding block; 10 - fixing member; 101 - limiting nut; 102 - threaded rod; 103 - positioning seat; 1031 - adjusting block; 1032 - positioning support; 1033 - locking nut; 20 - base. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will make further detailed description to the embodiments of the present application in combination with the drawings.

[0026] In addition, in the description of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and does not require the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, can be fixed connection, can also be detachable connection; can be directly connected, can also be indirectly connected through intermediate parts, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0027] In the related art, the double-layer lifting platform suitable for the stage, the upper and lower platform surfaces are a whole with a fixed relative position, and the distance between the upper and lower platform surfaces is always fixed during the lifting process of the lifting platform. Therefore, sufficient foundation pit depth is required to realize the lifting effect of the stage.

[0028] The embodiment of the present application aims to solve the defects of fixed distance between the upper and lower table surfaces and large required foundation pit depth in the above related technology, and provides a double-layer telescopic lifting table. Figure 1 is a structural schematic diagram of an embodiment of the double-layer telescopic lifting table of the present application; Figure 2 is a structural schematic diagram of another embodiment of the double-layer telescopic lifting table of the present application; Figure 3 is a principle schematic diagram of the double-layer telescopic lifting table of the present application; Figure 4 is a partial structural schematic diagram of still another embodiment of the double-layer telescopic lifting table of the present application; Figure 5 is a partial structural schematic diagram of yet another embodiment of the double-layer telescopic lifting table of the present application; Figure 6 is a partial structural schematic diagram of still another embodiment of the double-layer telescopic lifting table of the present application; Figure 7 is a partial structural schematic diagram of another embodiment of the double-layer telescopic lifting table of the present application. Among them, Figure 1 is a state before the jacking mechanism jacks up the lower table 3, Figure 2 is a state of the jacking mechanism jacking up the lower table 3. As Figures 1 to 7 shown, the double-layer telescopic lifting table of the present embodiment can include an upper table 1, a chain 2, a lower table 3, a sprocket 4 and a jacking mechanism. Among them, the upper table 1 can be provided with an upper table surface 11 and a plurality of columns 12, the bottom of the upper table surface 11 is fixedly connected with the top of the plurality of columns 12, and the columns 12 are connected with the first end 21 of the chain 2 at the position close to the bottom. The lower table 3 can be provided with a lower table surface 31 and a plurality of fixing frames 32, the lower table surface 31 is located below the upper table surface 11, the number of fixing frames 32 is the same as that of the columns 12, and there is a gap between the fixing frames 32 and the columns 12, the fixing frames 32 are fixed to the lower table surface 31, the fixing frames 32 are fixed with the sprocket 4, and the chain 2 is engaged with the sprocket 4. The jacking mechanism can be placed below the lower table surface 31 and include a rigid chain 5 and a power member 6 connected in transmission. The fixed position of the second end 22 of the chain 2 in the vertical direction can be lower than the sprocket 4, the power member 6 drives the rigid chain 5 to jack up the lower table 3, and the chain 2 cooperates with the sprocket 4 to drive the upper table 1 to rise relative to the lower table 3.

[0029] As Figure 3 shown, only the principle of lifting the upper table of the double-layer telescopic lifting table of the present embodiment is described, and the structure of the double-layer telescopic lifting table of the present embodiment is not limited. In the present embodiment, the sprocket 4 moves synchronously with the lower table 3. During the process of the jacking mechanism lifting the lower table 3, the sprocket 4 rises synchronously with the lower table 3, and since the second end 22 of the chain 2 is fixed, the sprocket 4 rotates in the clockwise direction as Figure 3 shown during the rising process, at the same time, the sprocket 4 gradually approaches the first end 21 of the chain 2, so that the first end 21 of the chain 2 rises relative to the lower table 3.

[0030] The sprocket 4 is fixed relative to the lower stage 3, and the height of the lower stage 3 is equal to the height of the sprocket 4, i.e. H1. The first end 21 of the chain 2 drives the upper stage 1 to rise, and the length of the chain 2 does not change in this process. The second end 22 of the chain 2 is fixed around the sprocket 4, so the height of the first end 21 of the chain 2 is twice the height of the sprocket 4, i.e. H2. That is, the height of the lower stage 3 is H1 under the action of the jacking mechanism, and the height of the upper stage 1 relative to the lower stage 3 is H1.

[0031] Further, in the vertical direction, the maximum height difference between the first end 21 and the sprocket 4 is greater than or equal to the maximum stroke of the jacking mechanism jacking the lower stage 3. When the upper stage 1 is lifted to the maximum stroke, the height of the first end 21 in the vertical direction is always lower than the height of the sprocket 4, avoiding the insufficient spacing between the first end 21 and the sprocket 4 affecting the height of the upper stage 1 and the lower stage 3 during the jacking of the lower stage 3 by the jacking mechanism.

[0032] The sprocket 4 can be rotatably connected to the top end of the fixed frame 32, and the fixed frame 32 can be fixed to the edge of the lower stage 31 and protrude from the lower stage 31 to avoid affecting the performance of the performer on the lower stage 31. The chain 2 is engaged with the sprocket 4, and the first end 21 of the chain 2 can be connected to the column 12, and the second end 22 of the chain 2 can be fixed to a position below the height of the sprocket 4 in the vertical direction, which can be the bottom of the foundation pit 8. Further preferably, a section of the chain 2 between the first end 21 and the sprocket 4 is parallel to a section of the chain 2 between the second end 22 and the sprocket 4, which reduces the interference of the chain 2 with other structures and improves the lifting efficiency of the lower stage 1. That is, if the two straight lines of the above-mentioned two sections of the chain 2 are intersected, the height H2 of the upper stage 1 lifted is less than twice the height H1 of the lower stage 3 lifted.

[0033] The fixed frame 32 can not only be used to fix the sprocket 4, but also cooperate with the column 12 to make the upper stage 1 move back and forth along the fixed frame 32 in the vertical direction during the lifting / descending process relative to the lower stage 3, avoiding the horizontal deviation of the fixed frame 32 and affecting the stability of the upper stage 1 and / or the lower stage 3. After the jacking mechanism stops jacking the lower stage 3, the upper stage 1 and the lower stage 3 begin to descend under the action of gravity, and the spacing between the upper stage 1 and the lower stage 3 is reduced from H1, until the jacking force disappears completely, and the spacing between the upper stage 1 and the lower stage 3 reaches the minimum value, i.e. returns to the initial state as shown in Figure 1 .

[0034] The fixed frame 32 and the column 12 can be one-to-one correspondence, wherein the number of sprocket wheels 4 fixed on the fixed frame 32 can be multiple, and the number of chains 2 used is equal to the number of sprocket wheels 4, and the number of first ends 21 fixed near the bottom of the column 12 is equal to the number of sprocket wheels 4. In another example, each column 12 can correspond to multiple fixed frames 32, and each fixed frame 32 is fixed with a sprocket wheel 4, and the number of chains 2 is equal to the number of fixed frames 32. In another example, each fixed frame 32 can correspond to multiple columns 12, and multiple sprocket wheels 4 can be arranged on the same fixed frame 32, and the number of chains 2 is equal to the number of columns 12. The number of fixed frames 32 and columns 12 can also be set by other combinations, which will not be enumerated one by one in this application.

[0035] The jacking mechanism for directly jacking the lower stage 3 can be a combination of a rigid chain 5 and a power element 6, wherein the rigid chain 5 is a linear actuator that can stably and quietly convey excess load. There is no direct contact between metal and metal, and it is stable, precise and noiseless, and can be used for moving stage scenery elements, elevators, lifting stages, etc. The rigid chain 5 can transmit thrust like a jack, which can greatly save installation space or reduce the requirement for installation space. The power element 6 in the embodiment can be a motor, and the transmission shaft of the motor can be detachably connected to the rigid chain 5. The motor is connected to a three-phase power supply, and the jacking of the lower stage 3 and the operation of canceling the jacking of the lower stage 3 are realized by forward and reverse rotation, thereby realizing the adjustment of the relative height between the upper stage 1 and the lower stage 3. Further, the power element 6 can be a servo motor, which operates very stably and avoids vibration affecting the performance of the performer.

[0036] The double-layer telescopic lifting stage of the embodiment sets a fixed frame 32 on the lower platform 31, so that the lower platform 31 and the fixed frame 32 move relatively and synchronously, the fixed frame 32 is rotationally connected to the sprocket wheel 4, the first end 21 of the chain 2 is fixed at a position near the bottom of the column 12 of the upper stage 1, and the second end 22 of the chain 2 is fixed relative to the foundation pit 8. During the jacking of the lower stage 3 by the jacking mechanism, the sprocket wheel 4 can be used as a moving pulley, the first end 21 of the chain 2 is a free end, and the second end 22 of the chain 2 is a fixed end. According to the principle of “moving pulley”, the power arm is equal to twice the resistance arm, and the height of the free end rising is twice the height of the sprocket wheel 4 rising. At the same time, the lifting stroke of the rigid chain 5 is also twice that of the upper stage 1, so that half of the stroke of the rigid chain 5 can be saved. In this process, the height of the upper stage 1 rising relative to the lower stage 3 is the same as the height of the lower stage 3 rising relative to the foundation pit 8. That is, the depth of the foundation pit 8 required by using the double-layer telescopic lifting stage of the embodiment can be 1 / 2 of the relative fixed double-layer lifting stage in the related art. The use of the double-layer telescopic lifting stage of the embodiment can reduce the depth of the required foundation pit 8, reduce the cost of stage design, and be more economical.

[0037] Further, in some embodiments, the double-layer telescopic lifting platform further comprises a first sliding rail 7 vertically fixed in the foundation pit 8, and a first sliding block 9 fixed at the edge of the lower platform 3 and slidingly connected with the first sliding rail 7. The second end 22 and the jacking mechanism are respectively fixed at the bottom of the foundation pit 8. As shown in Figure 1 、 Figure 2 and Figure 4 , the lower platform 3 can reciprocate along the vertical direction by cooperation of the first sliding block 9 and the first sliding rail 7. Through the above design, the contact area between the side surface of the lower platform 3 and the side wall of the foundation pit 8 can be reduced, thereby reducing the friction between the lower platform 3 and the foundation pit 8 during the lifting of the lower platform 3. In addition, the first sliding block 9 and the first sliding rail 7 can limit the rotation of the lower platform 3, so that the lower platform 3 can only reciprocate along the vertical direction.

[0038] As shown in Figure 1 、 Figure 2 and Figure 5 , in some embodiments, a positioning block 122 can be detachably connected to the stand column 12, and the positioning block 122 can be detachably connected to the first end 21. The stand column 12 can be slidingly connected with the lower platform 31. Specifically, the stand column 12 can be provided with a second sliding block 121, and the fixing frame 32 can be provided with a second sliding rail 321. The second sliding block 121 can be buckled to the second sliding rail 321 and reciprocate along the second sliding rail 321 in the vertical direction. In the present embodiment, the positioning block 122 can be detachably fixed to the stand column 12, that is, the position of the first end 21 of the chain 2 on the stand column 12 can be adjusted according to the length of the chain 2, the maximum lifting height, and other factors, thereby improving the flexibility of the double-layer telescopic lifting platform using the present embodiment.

[0039] In some embodiments, the second sliding block 121 can include a U-shaped connector and a fixing lug protruding from the bottom of the U-shaped connector, wherein the U-shaped connector can be integrally formed with the fixing lug. Parallel sides of the U-shaped connector are provided with fixing holes, and the fixing frame 32 is provided with an oblong hole. The two fixing holes are arranged on both sides of the oblong hole and are movably connected with the U-shaped connector and the fixing frame 32 through a pin shaft. The fixing lug is detachably connected with the stand column 12. The pin shaft passes through the oblong hole and the fixing hole to slidingly connect the second sliding block 121 with the fixing frame 32. The second sliding block 121 can reciprocate along the length direction of the oblong hole, which does not affect the relative movement between the fixing frame 32 and the stand column 12 in the vertical direction, and also can keep the connection between the fixing frame 32 and the stand column 12 through the pin shaft to avoid the disconnection of the fixing frame 32 and the stand column 12.

[0040] In some embodiments, as shown in Figure 1 、 Figure 2 and Figure 6As shown, the top end of the fixing frame 32 is detachably fixed with two bearing seats 322, the bearing seats 322 are rotationally connected with the sprocket wheels 4, and the maximum distance between the edges of the two sprocket wheels 4 is greater than the width of the fixing frame 32. Through the above design, the contact between the chain 2 and the fixing frame 32 during the jacking of the upper layer platform 1 and the lower layer platform 3 can be avoided, and the movement of the chain 2 in the vertical direction is not interfered.

[0041] In some embodiments, as shown in Figure 1 、 Figure 2 and Figure 7 , a fixing piece 10 can be connected to the second end 22 of the chain 2, which can include a limiting nut 101, a threaded rod 102 and a positioning seat 103, wherein the limiting nut 101 is fixedly connected to the second end 22, and the threaded rod 102 is movably connected with the limiting nut 101; the positioning seat 103 is provided with an integrally formed adjusting block 1031 and a positioning support 1032, the adjusting block 1031 is provided with a threaded hole, and the upper and lower sides of the adjusting block 1031 are provided with locking nuts 1033, the threaded rod 102 is threadedly connected with the adjusting block 1031 and locked by the locking nuts 1033, and the positioning support 1032 is fixed to the bottom of the foundation pit 8. In use, the first end 21 of the chain 2 can be fixed to the stand 12 first, and then the distance between the limiting nut 101 and the positioning seat 102 can be adjusted by the threaded rod 102, so as to adjust the tension of the chain 2, and avoid that the chain 2 is too loose to be separated from the sprocket wheel 4, thereby affecting the lifting effect of the upper layer platform 1.

[0042] In some embodiments, the double-layer telescopic lifting platform can further be provided with a base 20, which can be fixed to the bottom of the foundation pit 8, and the positioning support 1032 and the rigid chain 5 can be fixed to the same base 20 through detachable connection. When the jacking mechanism jacks up the lower layer platform 3, the downward force is transmitted to the base 20, the upward force of the second end 22 of the chain 2 is transmitted to the base through the fixing piece 10, the positioning support 1032 and the rigid chain 5 are fixed to the same base 20, part of the force can be balanced, and the tension mechanism for fixing the positioning support 1032 at the bottom of the foundation pit 8 is avoided to prevent the positioning support 1032 from being pulled up.

[0043] From the technical common sense, the present application can be realized through other embodiments without departing from the essential characteristics or necessary features. Therefore, the above disclosed embodiments are only examples, and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. A double-layer telescopic lifting platform, characterized in that, include: The upper platform (1) is provided with an upper platform (11) and multiple columns (12). The bottom of the upper platform (11) is fixedly connected to the top of the multiple columns (12). The first end (21) of the chain (2) is connected to the column (12) near the bottom of the column (12). The lower platform (3) is provided with a lower platform (31) and multiple fixing frames (32). The number of fixing frames (32) is the same as the number of columns (12). The fixing frames (32) are fixed to the lower platform (31). The fixing frames (32) are fixed with sprockets (4). The chain (2) meshes with the sprockets (4). The lifting mechanism is located below the lower platform (31) and includes a rigid chain (5) and a power component (6) for transmission connection. The second end (22) of the chain (2) is fixed in a vertical direction below the sprocket (4). The power component (6) drives the rigid chain (5) to lift the lower platform (3). The chain (2) and the sprocket (4) work together to drive the upper platform (1) to rise relative to the lower platform (3). The lifting stroke of the rigid chain (5) is twice the lifting stroke of the upper platform (1); The double-layer telescopic lifting platform also includes a first slide rail (7), which is vertically fixed in the pit (8). The edge of the lower platform (3) is fixed with a first slider (9), which is slidably connected to the first slide rail (7). The second end (22) and the lifting mechanism are respectively fixed to the bottom of the pit (8); In the vertical direction, the maximum height difference between the first end (21) and the sprocket (4) is greater than or equal to the maximum stroke of the lifting mechanism in lifting the lower platform (3); The height to which the lower platform (3) rises under the action of the lifting mechanism is equal to the height to which the upper platform (1) rises relative to the lower platform (3); The second end (22) is connected to a fixing member (10), which includes a limiting nut (101), a threaded rod (102) and a positioning seat (103). The limiting nut (101) is fixedly connected to the second end (22), and the threaded rod (102) is movably connected to the limiting nut (101). The positioning seat (103) is provided with an integrally formed adjusting block (1031) and positioning bracket (1032). The adjusting block (1031) has a threaded hole. Locking nuts (1033) are arranged on the upper and lower sides of the adjusting block (1031). The threaded rod (102) is threaded to the adjusting block (1031) and locked by the locking nuts (1033). The positioning bracket (1032) is fixed to the bottom of the pit (8).

2. The double-layer telescopic lifting platform according to claim 1, characterized in that, The column (12) is slidably connected to the lower platform (31).

3. The double-layer telescopic lifting platform according to claim 2, characterized in that, The column (12) is provided with a second slider (121), and the fixing frame (32) is provided with a second slide rail (321). The second slider (121) engages with the second slide rail (321) and moves back and forth along the second slide rail (321) in the vertical direction.

4. The double-layer telescopic lifting platform according to claim 3, characterized in that, The second slider (121) includes a U-shaped connector and a fixing lug protruding from the bottom of the U-shaped connector, wherein the U-shaped connector and the fixing lug are integrally formed; The U-shaped connector has corresponding fixing holes on its parallel two sides, and the fixing frame (32) has an elongated hole. The two fixing holes are located on both sides of the elongated hole and are movably connected to the U-shaped connector and the fixing frame (32) with a pin. The fixed ear piece is detachably connected to the column (12).

5. The double-layer telescopic lifting platform according to claim 4, characterized in that, The column (12) is detachably connected to a positioning block (122), and the positioning block (122) is detachably connected to the first end (21).

6. The double-layer telescopic lifting platform according to claim 4, characterized in that, The top of the fixed frame (32) is detachably fixed with two bearing seats (322), and the bearing seats (322) are rotatably connected to the sprockets (4). The maximum distance between the edges of the two sprockets (4) is greater than the width of the fixed frame (32).

7. The double-layer telescopic lifting platform according to claim 1, characterized in that, The double-layer telescopic lifting platform is also provided with a base (20), which is fixed to the bottom of the pit (8). The positioning bracket (1032) and the rigid chain (5) are detachably fixed to the same base (20).

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