An anti-tipping mechanism for a stage lift

Abstract

The present invention relates to the field of stage elevators, and specifically to an anti-tipping mechanism for a stage elevator, which includes: a limit mechanism arranged on the base. After the power assembly stops driving, the limit mechanism is used to limit the two rigid chains on the other side that move freely; two sets of chains are provided, and the tops of the two sets of chains are connected to both ends of the bottom of the stage board. A placement groove is arranged on the base, and an avoidance groove for the chains to pass through is arranged at the top of the placement groove; and an anti-tipping mechanism is arranged on the base to limit the movement of the chains, and the power input of the anti-tipping mechanism comes from the limit mechanism. In the present invention, the movement of the left rigid chain no longer needs to be driven by a set of motors, reducing the overall weight and also the cost. Moreover, the motor drive structures on the right also all use short shafts, which not only reduces the requirements for the shafts but also improves the service life. By providing the chains and the anti-tipping mechanism for restricting the position of the chains, further means for preventing tipping are provided.

Description

Technical Field

[0001] The present invention relates to the field of stage elevators, and particularly to an anti-tipping mechanism for a stage elevator. Background Art

[0002] A stage elevator is a height-adjustable mechanical device specifically designed for stage performances. It can flexibly change the height of the stage according to the needs of the performance, providing a convenient performance platform for actors.

[0003] Chinese Patent with Publication No. CN102322158B discloses a rigid-chain lifting stage. By driving the movement of the rigid chain in the chain joint in the lifting device through a driving device, the rigid chain is transformed from a horizontal state to a vertical state or from a vertical state to a horizontal state, and the rigid chain converts the horizontal rotation power into lifting force, thereby completing the lifting action of the stage platform. The structure is simple, the stage can be lifted more smoothly, safely and reliably, the cost is low, the equipment is easy to install, and it meets the needs of various stage lifts.

[0004] However, the above-disclosed solution has the following deficiencies: There are two rigid chains on each of the left and right sides, all driven by a reduction motor in the middle, which requires the cooperation of various long shafts and gears. For a stage that is several meters or even more than ten meters long, the required long shaft size is large, and the requirements for the long shaft are very high. The longer the shaft, the easier it is to bend and deform. In order to avoid using long shafts, there is another way in the prior art, which is to set two motors to drive the rigid chains on the left and right sides respectively. For a stage, the required motor power is very large, and the two large motors seriously increase the overall weight, increase the cost, and the power structure increases, and the subsequent maintenance work intensity also increases. Summary of the Invention

[0005] The object of the present invention is to propose an anti-tipping mechanism for a stage elevator in view of the problems in the background art that the rigid chains on both sides require long shafts or two motors to drive, resulting in an increase in failure rate, cost and maintenance difficulty.

[0006] The technical solution of the present invention: An anti-tipping mechanism for a stage elevator includes a base. Two rigid-chain driving devices are arranged on both transverse sides of the base. Annular guide rails are horizontally arranged on the rigid-chain driving devices. Rigid chains are slidably arranged on the annular guide rails in a matching manner. A stage board is arranged at the top of the four rigid chains. The two rigid chains at one end of the base are driven by a power assembly. Scissor supports are arranged on both longitudinal sides of the base and the stage board; further included are:

[0007] A limiting mechanism is arranged on the base. After the power assembly stops driving, the limiting mechanism is used to limit the two rigid chains on the other side that can move freely, so that the positions of the rigid chains are fixed;

[0008] There are two sets of chains. The tops of the two sets of chains are connected to both ends of the bottom of the stage board. A placement groove is provided on the base, and an avoidance groove for the chain to pass through is provided at the top of the placement groove;

[0009] And an anti-tipping mechanism is provided on the base to limit the movement of the chain. The power input of the anti-tipping mechanism comes from the limit mechanism.

[0010] Preferably, the power assembly includes a speed reducer and a motor provided on the base. The output shaft of the motor is connected to the input of the speed reducer. The speed reducer has two outputs, and the two outputs of the speed reducer drive two rigid chain drive devices to work respectively, thereby driving the rigid chain to move along the annular guide rail.

[0011] Preferably, the scissor support frame includes a plurality of support plates that are rotatably connected to each other. The scissor support frame can contract and extend in the vertical direction to change the height. Fixed blocks and slide rails are provided at the bottom of the stage board and the top of the base respectively. Sliders are slidably arranged on the slide rails. The bottom and the two free ends of the top of the scissor support frame are respectively rotatably connected to the fixed blocks and the sliders.

[0012] Preferably, the limit mechanism includes a rotating shaft connected to the input shaft of the rigid chain drive device through a coupling, a ratchet provided on the rotating shaft, a sliding frame slidably arranged on the base, a pawl provided on the sliding frame, and a telescopic assembly for driving the sliding frame to move horizontally.

[0013] Preferably, the telescopic assembly includes a pulling frame connected to the sliding frame and a telescopic device for driving the pulling frame to move horizontally.

[0014] Preferably, the anti-tipping mechanism includes fixing plates provided on the inner walls of the two placement grooves and close to the chains, support blocks located on both sides of the chains respectively with respect to the fixing plates, and a plurality of limiting rods provided on the support blocks; the plurality of limiting rods are used to limit the up and down movement of the chains, and a follower assembly for synchronously driving the two support blocks to move horizontally is provided on the base.

[0015] Preferably, the follower assembly includes a guide rod connected to the right support block, a connecting plate connected to the guide rod and the left support block at the same time, and a connecting frame connecting the connecting plate and the sliding frame at the same time.

[0016] Preferably, four limiting rods are provided. The four limiting rods are divided into two groups up and down. Each group includes two. The two groups of limiting rods are respectively located on the upper and lower sides of a section of the chain, and the distance between one group of limiting rods is less than the maximum width of the chain.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] Four rigid chains form four-point stable support for the stage board. The movement of the left rigid chain no longer requires a set of motors to drive, reducing the overall weight and cost. Moreover, the motor drive structures on the right all use short shafts instead of long shafts, which not only reduces the requirements for the shafts but also improves the service life.

[0019] By setting the chain and the anti-tipping mechanism for restricting the position of the chain, the tension of the left chain can prevent the stage board from tilting downward to the right, and the tension of the right chain can prevent the stage board from tilting downward to the left, further providing means of anti-tilting and improving the safety of the stage board during use. Brief Description of the Drawings

[0020] Figure 1 Stereogram of an embodiment of the present invention;

[0021] Figure 2 is Figure 1 Schematic diagram from another perspective;

[0022] Figure 3 is Figure 1 Structural schematic diagram after removing the stage board;

[0023] Figure 4 Structural schematic diagram of the limiting mechanism;

[0024] Figure 5 Structure of the anti-tipping mechanism;

[0025] Figure 6 is Figure 5 Enlarged schematic diagram at position A in

[0026] Reference numerals: 1, base; 2, annular guide rail; 3, rigid chain drive device; 4, rigid chain; 5, speed reducer; 6, motor; 7, stage board; 8, scissor support; 9, slide rail; 10, slider; 11, fixed block; 12, coupling; 13, rotating shaft; 14, ratchet; 15, pawl; 16, rotating rod; 17, sliding frame; 18, spring; 19, pulling frame; 20, telescopic device; 21, chain box; 22, chain; 23, avoidance groove; 24, fixing plate; 25, limiting rod; 26, support block; 27, guide rod; 28, connecting plate; 29, connecting frame; 30, weight reduction groove. Detailed Description of the Embodiment

[0027] Embodiment 1, as shown in Figure 1 - Figure 2As shown in the figure, a stage lift anti-tipping mechanism proposed by the present invention includes a base 1. Two rigid chain drive devices 3 are provided on both lateral sides of the base 1. An annular guide rail 2 is horizontally arranged on each of the rigid chain drive devices 3. A rigid chain 4 is slidably arranged on the annular guide rail 2 in a matching manner. A stage board 7 is arranged at the top of the four rigid chains 4. Two of the rigid chains 4 at one end of the base 1 are driven by a power assembly. Scissor supports 8 are arranged on both longitudinal sides of the base 1 and the stage board 7. The power assembly includes a speed reducer 5 and a motor 6 arranged on the base 1. The output shaft of the motor 6 is connected to the input of the speed reducer 5. The speed reducer 5 has two outputs. The two outputs of the speed reducer 5 respectively drive the two rigid chain drive devices 3 to work, thereby driving the rigid chain 4 to move along the annular guide rail 2. The rigid chain drive device 3 includes a housing and a driving wheel. The shaft of the driving wheel is rotatably arranged on the housing of the rigid chain drive device 3. The driving wheel meshes with the rigid chain. The shaft of the driving wheel is connected to the output of the speed reducer. The rotation of the driving wheel drives the rigid chain 4 to move along the annular guide rail 2. When the rigid chain 4 is in a vertically upward state, it is in a rigid support state and can bear a lot of pressure in the vertical direction, thereby providing stable support for the stage board 7. When the stage board 7 descends, the rigid chain 4 continuously winds around the annular guide rail 2. The scissor support 8 includes a plurality of support plates that are rotatably connected to each other. The scissor support 8 can contract and extend in the vertical direction to change its height. Fixed blocks 11 and slide rails 9 are arranged at the bottom of the stage board 7 and the top of the base 1 respectively. Sliders 10 are slidably arranged on the slide rails 9 in a matching manner. The bottom and the two free ends at the top of the scissor support 8 are respectively rotatably connected to the fixed block 11 and the slider 10. During the ascending process of the stage board 7, the scissor support 8 continuously rises. The upper and lower movable ends of the scissor support 8 respectively drive the slider 10 to approach the fixed block 11. On the contrary, during the descending process of the stage board 7, the scissor support 8 continuously descends and folds up. The upper and lower movable ends of the scissor support 8 respectively drive the slider 10 to move away from the fixed block 11. It further includes:

[0028] A limiting mechanism is arranged on the base 1. During the movement of the two rigid chains 4 at one end driven by the power assembly, the two rigid chains 4 on the other side of the base 1 move freely with the lifting and lowering of the stage board 7. After the power assembly stops driving, the limiting mechanism is used to limit the two freely moving rigid chains 4 on the other side, so that the position of the rigid chain 4 is fixed. Through the setting of the limiting mechanism, the setting of a large motor can be reduced, which helps to reduce the weight of the entire equipment and reduce costs.

[0029] Two sets of chains 22 are provided. The tops of the two sets of chains 22 are connected to both ends of the bottom of the stage board 7. A placement groove is arranged on the base 1. An avoidance groove 23 for the chains 22 to pass through is arranged at the top of the placement groove. A chain box 21 is arranged in the placement groove. The bottoms of the chains 22 are received in the chain box 21. In order to improve the stability of the bottoms of the chains 22, the bottoms of the chains 22 can be fixed to the bottom inner wall of the chain box 21.

[0030] The anti-tipping mechanism is arranged on the base 1 and used to limit the movement of the chain 22. The power input of the anti-tipping mechanism comes from the limit mechanism. Specifically, when the stage board 7 rises to the required height, the limit mechanism works to fix the positions of the two groups of rigid chains 4, forming four-point support for the bottom of the stage board 7. At the same time, the work of the limit mechanism drives the anti-tipping mechanism to work and fix the chain 22. After the chain 22 is tightened, it can play an anti-tipping role. For example, when the stage board 7 tilts to the left, the right chain 22 will be tightened to hold the stage board 7 so that it cannot tilt to the left. On the contrary, when the stage board 7 tilts to the right, the left chain 22 will be tightened to hold the stage board 7 so that it cannot tilt to the right.

[0031] And the control system is arranged on the base 1. The control system is connected to the power component and the limit mechanism in a controlled manner.

[0032] Embodiment 2, as Figure 3 - Figure 4 shown, an anti-tipping mechanism of a stage lift proposed by the present invention. Compared with Embodiment 1, the structure of the limit mechanism is introduced in detail in this embodiment.

[0033] The limit mechanism includes a rotating shaft 13 connected to the input shaft of the rigid chain driving device 3 through a coupling 12, a ratchet 14 arranged on the rotating shaft 13, a sliding frame 17 slidably arranged horizontally on the base 1, a pawl 15 arranged on the sliding frame 17, and a telescopic component for driving the sliding frame 17 to move horizontally. The pawl 15 cooperates with the ratchet 14. After the pawl 15 catches the ratchet 14, the ratchet 14 can no longer rotate counterclockwise, but can still rotate clockwise. The inability to rotate counterclockwise can limit the descent of the stage board 7, and this side can also provide stable support for the stage board 7. Specifically, a rotating rod 16 is rotatably arranged on the sliding frame 17, the pawl 15 is arranged on the rotating rod 16, and a spring 18 is arranged between the pawl 15 and the sliding frame 17. The spring 18 is used to improve the stability of the pawl 15 within a certain rotation range.

[0034] Further, the telescopic component includes a pulling frame 19 connected to the sliding frame 17 and a telescopic device 20 for driving the pulling frame 19 to move horizontally. The control system is connected to the telescopic device 20 in a controlled manner. A strip-shaped groove for the rotating shaft 13 to pass through horizontally is arranged on the pulling frame 19. The telescopic device 20 is arranged on the base 1, and the telescopic end of the telescopic device 20 is connected to the pulling frame 19. The telescopic device 20 is a cylinder or a hydraulic cylinder. In order to further reduce the complexity of the structure, the telescopic device 20 can be set as an electric push rod. At the same time, an elastic plugging structure is arranged on the base 1. When the pulling frame 19 is pulled to make the pawl 15 catch the ratchet 14, the elastic plugging structure catches the pulling frame 19 to limit the reverse movement of the pulling frame 19, thereby reducing the requirements for the telescopic device 20. In this case, the telescopic device 20 only needs to simply provide a tensile force and does not need to maintain a large static limiting force.

[0035] Embodiment 3. As shown in Figure 5 and Figure 6 shown, an anti-tipping mechanism for a stage lift proposed by the present invention. Compared with Embodiment 2, the structure of the anti-tipping mechanism is introduced in detail in this embodiment.

[0036] The anti-tipping mechanism includes fixing plates 24 arranged on the inner walls of two placement grooves and close to the chain 22, support blocks 26 located on both sides of the chain 22 with respect to the fixing plates 24, and a plurality of limiting rods 25 arranged on the support blocks 26; the plurality of limiting rods 25 are used to limit the up and down movement of the chain 22, and a follower assembly for synchronously driving the two support blocks 26 to move horizontally is arranged on the base 1.

[0037] Furthermore, the follower assembly includes a guide rod 27 connected to the right support block 26, a connecting plate 28 connected to both the guide rod 27 and the left support block 26, and a connecting frame 29 connecting the connecting plate 28 and the sliding frame 17; a guide hole for the guide rod 27 to pass through is arranged on the base 1, a weight-reducing groove 30 is arranged on the base 1, the guide hole horizontally penetrates through the weight-reducing groove 30, and the arrangement of the weight-reducing groove 30 can not only reduce the weight of the base 1, but also facilitate the machining of the guide hole.

[0038] Furthermore, four limiting rods 25 are arranged. The four limiting rods 25 are divided into two groups up and down, and each group includes two. The two groups of limiting rods 25 are respectively located on the upper and lower sides of a section of the chain 22. The distance between one group of limiting rods 25 is less than the maximum width of the chain 22. The length of a section of the rigid chain 4 is equal to the length of a section of the chain 22, or the length of a section of the rigid chain 4 is an integer multiple of the length of a section of the chain 22. The limiting effect of the limiting rods 25 includes two ways. One is that the four limiting rods 25 move to respectively clamp the upper and lower sides of a section of the chain 22. The other is that the chain 22 undergoes a certain angle of torsion. At this time, after the limiting rods 25 move, one of the limiting rods 25 in the upper and lower groups will insert into two adjacent sections of the chain 22 of a section of the chain 22, and the fixing of the chain 22 can also be completed. Of course, in the above two fixing structures, there is a certain amount of movement in the limit of the limiting rods 25 on the chain 22, which can avoid the limiting rods 25 directly pressing on the main body of the chain 22 and can also provide a relief means for manufacturing errors.

[0039] In summary, when the stage board 7 needs to be lifted or lowered, the telescopic device 20 first extends to release the restriction of the pawl 15 on the ratchet wheel 14. At the same time, the limit rod 25 releases the restriction on the chain 22. Then, the motor 6 and the speed reducer 5 drive the two rigid chain drive devices 3 to act, so that the two rigid chains 4 on the right side move actively to drive the lifting and lowering of the stage board 7. When the stage board 7 is lifted or lowered, it drives the two rigid chains 4 on the left side to move synchronously. In addition, the two scissor supports 8 on the longitudinal sides are lifted and lowered synchronously to maintain the stability of the stage board 7 during the lifting and lowering process. When the stage board 7 is adjusted to the required height, the motor 6 stops working, and then the telescopic device 20 contracts. The ratchet wheel 14 is restricted by the pawl 15 and cannot rotate counterclockwise. Therefore, the rigid chain 4 on the left side cannot contract downward and wind around the annular guide rail 2, that is, the rigid chain 4 on the left side can also provide stable support for the stage board 7. The four rigid chains 4 form four-point stable support for the stage board 7. The movement of the rigid chain 4 on the left side no longer needs to be driven by a group of motors, reducing the overall weight and cost. Moreover, the motor drive structure on the right side also uses short shafts instead of long shafts, which not only reduces the requirements for the shafts but also improves the service life. At the same time, the contraction of the telescopic device 20 will also drive the limit rod 25 to move to the right. The limit rod 25 fixes the chain 22 so that the chain 22 can no longer be lifted or lowered. The tension of the chain 22 on the left side can prevent the stage board 7 from tilting to the lower right, and the tension of the chain 22 on the right side can prevent the stage board 7 from tilting to the lower left, further providing an anti-tilting means.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to this. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A stage lift anti-tipping mechanism, comprising a base (1), two rigid chain drive devices (3) are arranged on both lateral sides of the base (1), annular guide rails (2) are arranged on the rigid chain drive devices (3) in the lateral direction, rigid chains (4) are arranged on the annular guide rails (2) for sliding cooperation, a stage board (7) is arranged on the top of the four rigid chains (4), two rigid chains (4) at one end of the base (1) are driven by a power assembly, and scissor-type support frames (8) are arranged on both longitudinal sides of the base (1) and the stage board (7); characterized in that: Also includes: A limiting mechanism is arranged on the base (1), and after the power assembly stops driving, the limiting mechanism is used to limit the two rigid chains (4) on the other side of the free movement, so that the position of the rigid chains (4) is fixed; Chains (22) are provided in two groups, the tops of the two groups of chains (22) are connected to the two ends of the bottom of the stage board (7), a placement groove is provided on the base (1), and an avoidance groove (23) is provided on the top of the placement groove for the chains (22) to pass through; and an anti-dumping mechanism, which is arranged on the base (1) and is used to limit the movement of the chain (22), wherein the power input of the anti-dumping mechanism is derived from the limiting mechanism; The limiting mechanism comprises a rotating shaft (13) connected to an input shaft of a rigid chain driving device (3) via a coupling (12), a ratchet (14) arranged on the rotating shaft (13), a sliding frame (17) slidably arranged on a base (1), a ratchet pawl (15) arranged on the sliding frame (17), and a telescopic component for driving the sliding frame (17) to move laterally.

2. The anti-dumping mechanism for stage lift according to claim 1, characterized in that: The power assembly comprises a reducer (5) and a motor (6) arranged on a base (1); an output shaft of the motor (6) is connected to an input of the reducer (5); the reducer (5) has two outputs; the two outputs of the reducer (5) respectively drive two rigid chain drive devices (3) to work, thereby driving the rigid chain (4) to move along the annular guide rail (2).

3. The anti-dumping mechanism for stage lift according to claim 1, characterized in that: The scissor-type support frame (8) comprises a plurality of support plates rotatably connected to each other. The scissor-type support frame (8) can shrink and stretch in the vertical direction to change its height. A fixed block (11) and a slide rail (9) are arranged at the bottom of the stage board (7) and the top of the base (1). A slide block (10) is arranged on the slide rail (9) to slide in cooperation with the slide rail. The two free ends at the bottom and the top of the scissor-type support frame (8) are rotatably connected to the fixed block (11) and the slide rail (10) respectively.

4. The anti-dumping mechanism for stage lift according to claim 1, characterized in that: The telescopic assembly comprises a pulling frame (19) connected to the sliding frame (17), and a telescopic device (20) for driving the pulling frame (19) to move laterally.

5. The anti-dumping mechanism for stage lift according to claim 1, characterized in that: The anti-dumping mechanism comprises a fixing plate (24) arranged on the inner walls of the two placement grooves and close to the chain (22), a supporting block (26) located on both sides of the chain (22) together with the fixing plate (24), and a plurality of limiting rods (25) arranged on the supporting block (26); the plurality of limiting rods (25) are used to limit the upward and downward movement of the chain (22), and a follower assembly is arranged on the base (1) for synchronously driving the two supporting blocks (26) to move horizontally.

6. The anti-dumping mechanism for stage lift according to claim 5, characterized in that: The follower assembly comprises a guide rod (27) connected to the right support block (26), a connecting plate (28) connected to the guide rod (27) and the left support block (26), and a connecting frame (29) connected to the connecting plate (28) and the sliding frame (17).

7. The anti-dumping mechanism for a stage lift according to claim 5, characterized in that: Four limit rods (25) are provided, and the four limit rods (25) are divided into two groups, each group including two limit rods. The two groups of limit rods (25) are respectively located at the upper and lower sides of a chain (22), and the distance between the limit rods (25) in one group is less than the maximum width of the chain (22).

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