Anti-dumping mechanism for stage lift

Abstract

The present invention relates to the field of stage lifts, and specifically to an anti-dumping mechanism for stage lifts, which includes: a limiting mechanism, which is arranged on a base, and after the power assembly stops driving, the limiting mechanism is used to limit the two rigid chains on the other side that are free to move; two groups of chains, the tops of the two groups of chains are connected to the two 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 on the top of the placement groove; and an anti-dumping mechanism, which is arranged on the base and is used to limit the movement of the chains, and the power input of the anti-dumping mechanism comes from the limiting mechanism. In the present invention, the movement of the rigid chain on the left side does not need to be driven by a set of motors, which reduces the overall weight and also reduces the cost, and the motor drive structure on the right side also uses short shafts, which not only reduces the requirements for the shafts, but also increases the service life. By providing chains and an anti-dumping mechanism for limiting the position of the chains, anti-tilting means are further provided.

Description

Technical Field

[0001] The invention relates to the field of stage lifts, and in particular to an anti-dumping mechanism for a stage lift. Background Art

[0002] The stage lift is a height-adjustable mechanical device specially designed for stage performances. It can flexibly change the height of the stage according to the needs of the performance and provide a convenient performance platform for the actors.

[0003] The Chinese patent with the announcement number CN102322158B discloses a rigid chain lifting stage, which drives the rigid chain in the lifting device to move in the chain joint through the driving device, so that the rigid chain is transformed from a horizontal state to a vertical state or from a vertical state to a horizontal state, so that the rigid chain converts the horizontal rotation power into a lifting force, thereby completing the lifting action of the stage surface. The structure is simple, which can make the stage lifting more stable and smooth, safe and reliable, low cost, easy to install, and suitable for various stage lifting needs.

[0004] However, the above-mentioned publicly disclosed scheme has the following shortcomings: two rigid chains on each side are all driven by the reduction motor in the middle, and various long shafts and gears need to be coordinated. For a stage that is several meters or even more than ten meters long, the required long shaft size is relatively 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 to move respectively. For the stage, the required motor power is very large. The two large motors seriously increase the overall weight and cost. In addition, the power structure increases, and the intensity of subsequent maintenance work also increases. Summary of the invention

[0005] The purpose of the present invention is to propose an anti-dumping mechanism for a stage lift to address the problems in the background technology that rigid chains on both sides require long shafts or two motors to drive, which increases the failure rate, cost and maintenance difficulty.

[0006] The technical solution of the present invention is: a stage lift anti-dumping mechanism, comprising a base, two rigid chain driving devices are arranged on both lateral sides of the base, annular guide rails are arranged on the rigid chain driving devices, rigid chains are arranged on the annular guide rails for sliding, a stage board is arranged on the top of the four rigid chains, two rigid chains at one end of the base are driven by a power assembly, and scissor-type support frames are arranged on both longitudinal sides of the base and the stage board; and also includes: The 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 of the free movement so that the position of the rigid chains is fixed; Chains are provided in two groups, the tops of the two groups of chains are connected to the two ends of the bottom of the stage board, a placement groove is provided on the base, and an avoidance groove for the chains to pass through is provided on the top of the placement groove; And an anti-dumping mechanism is arranged on the base and is used to limit the movement of the chain. The power input of the anti-dumping mechanism comes from the limiting mechanism.

[0007] Preferably, the power assembly includes a reducer and a motor arranged on a base, the output shaft of the motor is connected to the input of the reducer, the reducer has two outputs, and the two outputs of the reducer respectively drive two rigid chain drive devices to work, thereby driving the rigid chain to move along the annular guide rail.

[0008] Preferably, the scissor-type support frame includes a plurality of support plates rotatably connected to each other, the scissor-type support frame can shrink and stretch in the vertical direction to change the height, fixed blocks and slide rails are arranged at the bottom of the stage panel and the top of the base, and sliders are arranged on the slide rails for sliding cooperation, and the two free ends at the bottom and top of the scissor-type support frame are rotatably connected to the fixed blocks and the sliders respectively.

[0009] Preferably, the limiting mechanism includes a rotating shaft connected to the input shaft of the rigid chain driving device through a coupling, a ratchet arranged on the rotating shaft, a sliding frame slidably arranged on the base, a pawl arranged on the sliding frame, and a telescopic component that drives the sliding frame to move laterally.

[0010] Preferably, the telescopic assembly includes a pulling frame connected to the sliding frame, and a telescopic device that drives the pulling frame to move laterally.

[0011] Preferably, the anti-dumping mechanism includes a fixed plate arranged on the inner walls of the two placement grooves and close to the chain, support blocks located on both sides of the chain with the fixed plate, and multiple limit rods arranged on the support blocks; the multiple limit rods are used to limit the up and down movement of the chain, and a follow-up component is arranged on the base to synchronously drive the two support blocks to move horizontally.

[0012] Preferably, the follower assembly includes a guide rod connected to the right support block, a connecting plate connected to both the guide rod and the left support block, and a connecting frame connected to both the connecting plate and the sliding frame.

[0013] Preferably, four limit rods are provided, and the four limit rods are divided into two groups up and down, each group includes two limit rods, and the two groups of limit rods are respectively located on the upper and lower sides of a chain section, and the distance between the limit rods in one group is less than the maximum width of the chain.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: Four rigid chains form four-point stable support for the stage board. The movement of the left rigid chain does not need to be driven by a set of motors, which reduces the overall weight and cost. In addition, the motor drive structure on the right side uses short shafts instead of long shafts, which reduces the requirements for the shafts and increases the service life. By providing a chain and an anti-tipping mechanism for limiting the position of the chain, tightening the chain on the left side can prevent the stage board from tilting to the lower right, and tightening the chain on the right side can prevent the stage board from tilting to the lower left, further providing an anti-tilting measure and improving the safety of the stage board during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram from another perspective; Figure 3 for Figure 1 The schematic diagram of the structure after removing the stage board; Figure 4 It is a schematic diagram of the limit mechanism structure; Figure 5 The structure of the anti-dumping mechanism; Figure 6 for Figure 5 A is an enlarged schematic diagram.

[0016] : 1. base; 2. annular guide rail; 3. rigid chain drive device; 4. rigid chain; 5. reducer; 6. motor; 7. stage board; 8. scissor-type support frame; 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. fixed plate; 25. limit rod; 26. support block; 27. guide rod; 28. connecting plate; 29. ​​connecting frame; 30. weight reduction groove. DETAILED DESCRIPTION

[0017] Embodiment 1, as Figure 1-Figure 2As shown, an anti-dumping mechanism for a stage lift proposed by the present invention comprises 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, 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, scissor-type support frames 8 are arranged on both longitudinal sides of the base 1 and the stage board 7, the power assembly comprises a 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 reducer 5, the reducer 5 has two outputs, and the two outputs of the 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 comprises a shell and a driving wheel, the shaft of the driving wheel is rotatably arranged on the shell of the rigid chain drive device 3, the driving wheel is meshed with the rigid chain, the shaft of the driving wheel is connected to the output of the reducer, and the rotation of the driving wheel is driven by the rigid chain. The dynamic rigid chain 4 moves along the annular guide rail 2. The rigid chain 4 is in a rigid support state when it is vertically upward, and can withstand 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 is continuously wrapped around the annular guide rail 2; the scissor-type support frame 8 includes a plurality of support plates rotatably connected to each other, and the scissor-type support frame 8 can shrink and stretch in the vertical direction to change the 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 slider 10 is arranged on the slide rail 9 to cooperate with sliding. The two free ends at the bottom and top of the scissor-type support frame 8 are rotatably connected to the fixed block 11 and the slider 10 respectively; during the rising process of the stage board 7, the scissor-type support frame 8 is continuously raised, and the upper and lower movable ends of the scissor-type support frame 8 respectively drive the slider 10 close to the fixed block 11. Conversely, during the descending process of the stage board 7, the scissor-type support frame 8 is continuously lowered and retracted, and the upper and lower movable ends of the scissor-type support frame 8 respectively drive the slider 10 away from the fixed block 11; it also includes: The limiting mechanism is arranged on the base 1. When the two rigid chains 4 at one end are driven by the power assembly to move, the two rigid chains 4 on the other side of the base 1 can 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 rigid chains 4 on the other side that are free to move, so that the position of the rigid chains 4 is fixed. By setting the limiting mechanism, the setting of a group of large motors can be reduced, which helps to reduce the weight of the entire equipment and reduce the cost. 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 for the chains 22 to pass through is provided on the top of the placement groove, a chain box 21 is provided in the placement groove, and the bottom of the chain 22 is stored in the chain box 21. In order to improve the stability of the bottom of the chain 22, the bottom of the chain 22 can be fixed on the bottom inner wall of the chain box 21; The anti-dumping mechanism is arranged on the base 1 and is used to limit the movement of the chain 22. The power input of the anti-dumping mechanism comes from the limiting mechanism. Specifically, when the stage board 7 rises to the required height, the limiting mechanism works to fix the positions of the two sets of rigid chains 4, forming a four-point support for the bottom of the stage board 7. At the same time, the work of the limiting mechanism drives the anti-dumping mechanism to work to fix the chain 22. After the chain 22 is tightened, it can play an anti-dumping role. For example, when the stage board 7 tilts to the left, the chain 22 on the right will tighten and pull the stage board 7 to prevent it from tilting to the left. On the contrary, when the stage board 7 tilts to the right, the chain 22 on the left will tighten and pull the stage board 7 to prevent it from tilting to the right. And a control system is arranged on the base 1, and the control system is controlled and connected with the power component and the limit mechanism.

[0018] Embodiment 2, as Figure 3-Figure 4 As shown, the present invention proposes an anti-dumping mechanism for a stage lift. Compared with the first embodiment, this embodiment introduces the structure of the limiting mechanism in detail.

[0019] The limiting 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 arranged on the base 1 for transverse sliding, a pawl 15 arranged on the sliding frame 17, and a telescopic component for driving the sliding frame 17 to move transversely; the pawl 15 cooperates with the ratchet 14, and after the pawl 15 grabs 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, and the spring 18 is used to improve the stability of the pawl 15 within a certain rotation range.

[0020] Furthermore, the telescopic assembly includes a pulling frame 19 connected to the sliding frame 17, and a telescopic device 20 that drives the pulling frame 19 to move horizontally; the control system is control-connected to the telescopic device 20, and the pulling frame 19 is provided with a horizontal strip groove for the rotating shaft 13 to pass through, and 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, and an elastic plug-in structure is set on the base 1. When the pulling frame 19 is pulled to make the pawl 15 clamp the ratchet 14, the elastic plug-in structure clamps the pulling frame 19, and the reverse movement of the pulling frame 19 is limited by the elastic plug-in structure, thereby reducing the requirements of the telescopic device 20. In this case, the telescopic device 20 only needs to provide a tensile force, and does not need to maintain a large static limiting force.

[0021] Embodiment three, as Figure 5 and Figure 6 As shown, the present invention proposes an anti-dumping mechanism for a stage lift. Compared with the second embodiment, this embodiment introduces the structure of the anti-dumping mechanism in detail.

[0022] The anti-dumping mechanism includes a fixing plate 24 arranged on the inner walls of the two placement grooves and close to the chain 22, a support block 26 located on both sides of the chain 22 with the fixing plate 24, and a plurality of limit rods 25 arranged on the support block 26; the plurality of limit rods 25 are used to limit the up and down movement of the chain 22, and a follower component is arranged on the base 1 to synchronously drive the two support blocks 26 to move horizontally.

[0023] Furthermore, the follower assembly includes 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 simultaneously connecting the connecting plate 28 and the sliding frame 17; a guide hole for the guide rod 27 to pass through is provided on the base 1, and a weight-reducing groove 30 is provided on the base 1, and the guide hole passes through the weight-reducing groove 30 horizontally. The setting of the weight-reducing groove 30 can not only reduce the weight of the base 1, but also facilitate the processing of the guide hole.

[0024] Furthermore, four limit rods 25 are provided, and the four limit rods 25 are divided into two groups up and down, each group includes two, and the two groups of limit rods 25 are respectively located on the upper and lower sides of a chain section 22, and the distance between a group of limit rods 25 is less than the maximum width of the chain 22. The length of a rigid chain 4 is equal to the length of a rigid chain 4, or the length of a rigid chain 4 is an integer multiple of a chain section 22. The limiting effect of the limit rod 25 includes two modes. One is that the four limit rods 25 move to respectively clamp the upper and lower sides of a chain section 22, and the chain 22 is twisted at a certain angle. At this time, after the limit rod 25 moves, one of the limit rods 25 in the upper and lower groups will be inserted into the two upper and lower adjacent chain sections 22 of a chain 22, which can also complete the fixation of the chain 22. Of course, in the above two fixing structures, there is a little activity in the limit rod 25 to limit the chain 22, which can avoid the limit rod 25 directly pressing on the chain 22 body, and can also provide a little relief for manufacturing errors.

[0025] In summary, when the stage panel 7 needs to be raised or lowered, the telescopic device 20 is first extended to release the restriction of the ratchet 15 on the ratchet 14, and at the same time the limit rod 25 releases the restriction on the chain 22, and then the two rigid chain driving devices 3 are driven by the motor 6 and the reducer 5 to operate, so that the two rigid chains 4 on the right side actively move to drive the stage panel 7 to rise and fall. When the stage panel 7 is raised or lowered, the two rigid chains 4 on the left side are driven to move synchronously. In addition, the two scissor-type support frames 8 on the longitudinal sides are raised or lowered synchronously to maintain the stability of the stage panel 7 during the lifting process. When the stage board 7 is adjusted to the required height, the motor 6 stops working, and then the telescopic device 20 contracts, and the ratchet 14 is restricted by the pawl 15. The ratchet 14 cannot rotate counterclockwise, so that the rigid chain 4 on the left cannot contract downward and wrap around the annular guide rail 2, that is, the rigid chain 4 on the left can also provide stable support for the stage board 7. The four rigid chains 4 form a four-point stable support for the stage board 7. The movement of the rigid chain 4 on the left does not need to be driven by a set of motors, which reduces the overall weight and reduces the cost. The motor drive structure on the right also uses short shafts instead of long shafts, which reduces the requirements for the shafts and increases the service life. At the same time, the contraction of the telescopic device 20 will also drive the limit rod 25 to move rightward. The limit rod 25 fixes the chain 22 so that the chain 22 can no longer be raised or lowered. The tension of the chain 22 on the left can prevent the stage board 7 from tilting to the lower right, and the tension of the chain 22 on the right can prevent the stage board 7 from tilting to the lower left, further providing an anti-tilt measure.

[0026] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

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 comes from the limiting mechanism.

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 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.

5. The anti-dumping mechanism for stage lift according to claim 4, 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.

6. The anti-dumping mechanism for stage lift according to claim 4, 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.

7. The anti-dumping mechanism for a stage lift according to claim 6, 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).

8. The anti-dumping mechanism for a stage lift according to claim 6, 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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