Two-degree-of-freedom and rotational motion control platform for stage performance

Abstract

The invention discloses a two-degree-of-freedom and rotational motion control platform for stage performance, and relates to the technical field of aluminum bar rolling. The device comprises a supporting table, a lamplight assembly is fixedly connected to the position, close to one side, of the top end of the supporting table, an inner groove is formed in the position, close to the center, of the interior of the supporting table, a control assembly is arranged at the position, located in the inner groove, of the top end of the supporting table, the lamplight assembly comprises two base columns, and the bottom ends of the base columns are fixedly connected with the top end of the supporting table; a top plate is fixedly connected between the top ends of the two base columns, flash lamps are symmetrically and fixedly connected to the positions, close to the two sides, of the bottom end of the top plate, toothed plates are symmetrically and fixedly connected to the centers of the two side ends of the inner groove, and the control assembly comprises a supporting plate. According to the lifting device for the stage, a motor is operated, then under the mutual cooperation of a transmission shaft, two sets of second synchronous wheels, a second synchronous belt, two lead screws, a top column and a mounting box, a supporting plate and a control assembly below the supporting plate are driven to ascend, and then lifting operation of the whole stage can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stage device, in particular to a two-degree-of-freedom plus rotation motion control platform for stage performance. BACKGROUND

[0002] On the existing stage, sound or video information collection along a certain trajectory is required many times, such as image shooting around the stage. In this case, the cameraman holds the camera to shoot on the stage. This shooting method makes the shooting effect unstable, and cannot well realize the reproduction of the picture and the combination effect of the sound image. To solve the above problems, the present application provides a two-degree-of-freedom plus rotation motion control platform for stage performance. SUMMARY

[0003] In order to solve the problem that the cameraman needs to hold the camera to shoot on the stage when the stage is rotating, the shooting method requires a high level of cameraman, and the shooting effect is unstable. The purpose of the present application is to provide a two-degree-of-freedom plus rotation motion control platform for stage performance.

[0004] To solve the above technical problems, the present application adopts the following technical scheme: a two-degree-of-freedom plus rotation motion control platform for stage performance, comprising a support table, a light assembly is fixedly connected to the top end of the support table near one side, an inner groove is formed in the inner part of the support table near the center, and a control assembly is arranged on the top end of the support table at the inner groove.

[0005] Preferably, the light assembly comprises two base columns, the base columns are fixedly connected to the top end of the support table, a top plate is fixedly connected between the top ends of the two base columns, flashlights are symmetrically fixedly connected to the bottom end of the top plate near the two sides, and tooth plates are symmetrically fixedly connected to the center of the two sides of the inner groove.

[0006] Preferably, the control assembly comprises a support plate, the support plate is in sliding contact with the inner groove, the diameter of the support plate is the same as that of the inner groove, a placing groove is symmetrically formed in the inner part of the support plate near the center, column grooves are symmetrically formed in the two side ends of the support plate, and guide grooves are symmetrically formed in the inner part of the support plate near one side.

[0007] Preferably, a rotating table is rotatably connected in the placing groove, a sliding column is slidably connected in the guide groove, and a camera is detachably connected to the top end of the sliding column.

[0008] Preferably, the bottom end of the support plate is symmetrically and fixedly connected with a connecting frame near the center, the bottom end of the rotating table is fixedly connected with a connecting shaft one, and the bottom end of the connecting shaft one is rotationally connected with the top end of the connecting frame, one end of the connecting frame away from the base column is fixedly connected with a support plate at the center, the top end of the support plate is fixedly connected with a rear connecting plate three near the connecting shaft one, the top end of the support plate is fixedly connected with a connecting plate four near the connecting plate three, the outer circle of the connecting shaft one is fixedly connected with a bevel gear one near the connecting frame, one end of the connecting plate three rotationally connected with a bevel gear two is near the bevel gear one, and the bevel gear two is engaged with the bevel gear one.

[0009] Preferably, the bottom end of the support plate is symmetrically and fixedly connected with a connecting plate one near the toothed plate, one end of the connecting plate one rotationally connected with a rotating wheel is near the toothed plate, and the rotating wheel is engaged with the toothed plate, one end of the connecting plate one away from the rotating wheel and one end of the connecting plate four away from the bevel gear one are symmetrically and rotationally connected with a synchronous wheel one, and the two synchronous wheel ones are transmissionally connected with a synchronous belt one.

[0010] Preferably, the inner wall of the connecting plate one is rotationally connected with a connecting shaft two, one end of the connecting shaft two is fixedly connected with the rotating wheel by penetrating the connecting plate one, the other end of the connecting shaft two is fixedly connected with one of the synchronous wheel ones by penetrating the connecting plate one, the connecting plate four and the connecting plate three are rotationally connected with a connecting shaft three, one end of the connecting shaft three is fixedly connected with the bevel gear two by penetrating the connecting plate three, and the other end of the connecting shaft three is fixedly connected with the other synchronous wheel one by penetrating the connecting plate four.

[0011] Preferably, one end of the synchronous wheel one away from the connecting shaft three is fixedly connected with a half-face bevel gear, the inner wall of the support plate is rotationally connected with a connecting shaft four, the outer circle of the connecting shaft four is symmetrically and fixedly connected with a bevel gear three near the half-face bevel gear, and the two bevel gears three are engaged with the half-face bevel gear, the top end of the connecting shaft four is fixedly connected with a connecting plate five by penetrating the support plate, and the top end of the connecting plate five is fixedly connected with the bottom end of the slide column.

[0012] Preferably, the bottom end of the inner groove is fixedly connected with a motor at the center, the bottom end of the inner groove is fixedly connected with a mounting column near the motor, the bottom end of the mounting column is rotationally connected with a transmission shaft at the center, and the output end of the motor is fixedly connected with the transmission shaft.

[0013] Preferably, the bottom end of the inner groove is fixedly connected with a mounting box symmetrically at both sides away from the toothed plate, the bottom end of the mounting box is rotationally connected with a lead screw at the center of the inner wall, the mounting box is slidingly connected with a top column inside, and the top column is fixedly connected with the support plate, the top column is screwedly and rotationally connected with the lead screw, the outer circle of the lead screw and the outer circle of the transmission shaft are fixedly connected with a synchronous wheel two, and the two synchronous wheel twos are transmissionally connected with a synchronous belt two.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1. In this invention, by running a motor, and then through the cooperation between the transmission shaft, two sets of synchronous pulleys, synchronous belts, two lead screws, top column, and mounting box, the support plate and the control components below the support plate are driven to rise, thereby realizing the lifting and lowering operation of the entire stage;

[0016] 2. In this invention, after the turntable rotates, the turntable located in the placement slot rotates due to the mutual cooperation between the connecting plate one, the connecting shaft two, the synchronous wheel one, the synchronous belt one, the connecting plate four, the connecting plate three, the connecting shaft three, the bevel gear two, and the bevel gear one, thereby enabling the performer standing on the turntable to rotate.

[0017] 3. In this invention, when the first synchronous wheel rotates, the interaction between the half-face bevel gear, the two bevel gears, the connecting shaft, the connecting plate, the support plate, the sliding column, and the guide groove solves the problem that when the stage is rotating, the cameraman needs to hold the camera on the stage to shoot. This shooting method requires a high level of skill from the cameraman and the shooting effect is unstable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the present invention from another perspective.

[0021] Figure 3 This is a schematic diagram of the inner groove structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the support plate structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the mounting column structure of the present invention.

[0024] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0025] Figure 7 For the present invention Figure 3 Enlarged structural diagram at point B.

[0026] Figure 8 For the present invention Figure 5Enlarged structural diagram at point C.

[0027] In the diagram: 1. Support platform; 102. Toothed plate; 103. Inner groove; 2. Lighting assembly; 201. Base column; 202. Top plate; 203. Flash light; 3. Control assembly; 301. Support plate; 302. Mounting column; 303. Placement groove; 304. Guide groove; 305. Connecting frame; 306. Connecting shaft one; 307. Bevel gear one; 308. Bevel gear two; 309. Rotary wheel; 310. Connecting plate one; 311. Connecting shaft two; 313. Connecting plate three; 314. 315. Connecting Shaft 3; 316. Connecting Plate 4; 317. Synchronous Pulley 1; 318. Synchronous Belt 1; 319. Half-face Bevel Gear; 320. Support Plate; 321. Bevel Gear 3; 322. Connecting Shaft 4; 323. Connecting Plate 5; 324. Sliding Column; 325. Camera; 326. Motor; 327. Drive Shaft; 328. Synchronous Pulley 2; 329. Synchronous Belt 2; 330. Mounting Box; 331. Top Column; 332. Lead Screw; 333. Column Groove; 334. Turntable. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example: Figures 1-8 As shown, the present invention provides a technical solution: a two-degree-of-freedom plus rotational motion control platform for stage performances, including a support platform 1. The support platform 1 is set to support and fix two base columns 201 above. A lighting assembly 2 is fixedly connected to one side of the top of the support platform 1. The lighting assembly 2 is set so that the two sets of flashlights 203 in the lighting assembly 2 can follow the rotation of the turntable 333 to achieve angular shift, so that the light can always shine on the performer. An inner groove 103 is opened near the center inside the support platform 1. The inner groove 103 is opened to facilitate the installation of internal control components 3 and other devices. The control component 3 is installed at the top of the support platform 1 at the inner groove 103.

[0030] The lighting assembly 2 includes two base columns 201, with the bottom of the base columns 201 fixedly connected to the top of the support platform 1. A top plate 202 is fixedly connected between the tops of the two base columns 201. Flash lamps 203 are symmetrically fixedly connected to the bottom of the top plate 202 near both sides. Toothed plates 102 are symmetrically fixedly connected to the center of both sides of the inner groove 103.

[0031] By adopting the technical scheme, the two groups of flashlights 203 arranged at the bottom end of the top plate 202 can track and flash according to the position of the performer, and the toothed plate 102 is arranged to drive the rotating wheel 309 to rotate, and when the rotating wheel 309 moves to the toothed plate 102, the rotating wheel 309 can rotate under the meshing action.

[0032] The control assembly 3 comprises a support plate 301 in sliding contact with the inner groove 103, the diameter of the support plate 301 is the same as that of the inner groove 103, symmetrically arranged placing grooves 303 are arranged inside the support plate 301 close to the center, symmetrically arranged column grooves 332 are arranged at the two side ends of the support plate 301, and symmetrically arranged guide grooves 304 are arranged inside the support plate 301 close to one side.

[0033] The two placing grooves 303 are arranged to place two rotating tables 333, the diameter of the rotating table 333 is the same as that of the placing groove 303, the column groove 332 is arranged to prevent the support plate 301 from interfering with the normal work of the toothed plate 102 when the support plate 301 rises, and the toothed plate 102 is matched with the column groove 332, and the diameter of the guide groove 304 is matched with that of the slide column 323.

[0034] The rotating table 333 is rotatably connected in the placing groove 303, and the slide column 323 is slidably connected in the guide groove 304.

[0035] The slide column 323 can slide in the guide groove 304 matched with the slide column 323 to drive the camera 324 to deviate in angle, and the camera 324 and the slide column 323 are detachably arranged at the top end, so that the camera 324 can be conveniently maintained and other devices to be installed can be replaced.

[0036] The support plate 301 is fixedly connected with a connecting frame 305 symmetrically arranged at the bottom end close to the center, the rotating table 333 is fixedly connected with a connecting shaft one 306 at the bottom end, the connecting shaft one 306 is rotatably connected with the connecting frame 305 at the bottom end, the connecting frame 305 is fixedly connected with a support plate 319 at the end away from the base column 201 and at the center, the support plate 319 is fixedly connected with a third connecting plate 313 at the top end close to the connecting shaft one 306, the support plate 319 is fixedly connected with a fourth connecting plate 315 at the top end close to the third connecting plate 313, the connecting shaft one 306 is fixedly connected with a bevel gear one 307 at the outer circle and close to the connecting frame 305, the third connecting plate 313 is rotatably connected with a bevel gear two 308 at one end close to the bevel gear one 307, and the bevel gear two 308 is meshed with the bevel gear one 307.

[0037] By adopting the above technical scheme, when the connecting shaft three 314 rotates, the bevel gear two 308 fixedly connected thereto will rotate, so that the bevel gear one 307 connected in meshing drives the connecting shaft one 306 to rotate, the fixedly connected support plate 319 is arranged to support the connecting plate four 315, the connecting plate three 313 and the two bevel gear threes 320, thereby stabilizing the operation of the whole device.

[0038] The connecting plate one 310 is symmetrically fixedly connected to the bottom end of the support plate 301 close to the tooth plate 102, one end of the connecting plate one 310 close to the tooth plate 102 is rotatably connected with the rotating wheel 309, the rotating wheel 309 is in meshing connection with the tooth plate 102, one end of the connecting plate one 310 away from the rotating wheel 309 and one end of the connecting plate four 315 away from the bevel gear one 307 are symmetrically rotatably connected with the synchronous wheel one 316, and the two synchronous wheel ones 316 are in transmission connection with the synchronous belt one 317.

[0039] By adopting the above technical scheme, the rotating wheel 309 rotates under the action of the tooth plate 102, so that the fixedly connected connecting shaft two 311 rotates, and the fixedly connected synchronous wheel one 316 rotates.

[0040] The connecting shaft two 311 is rotatably connected between the inner walls of the connecting plate one 310, one end of the connecting shaft two 311 penetrates through the connecting plate one 310 and is fixedly connected with the rotating wheel 309, the other end of the connecting shaft two 311 penetrates through the connecting plate one 310 and is fixedly connected with one of the synchronous wheel ones 316, the connecting plate four 315 and the connecting plate three 313 are rotatably connected with the connecting shaft three 314, one end of the connecting shaft three 314 penetrates through the connecting plate three 313 and is fixedly connected with the bevel gear two 308, and the other end of the connecting shaft three 314 penetrates through the connecting plate four 315 and is fixedly connected with the other synchronous wheel one 316.

[0041] By adopting the above technical scheme, one of the synchronous wheel ones 316 rotates, and then under the action of the synchronous belt one 317, the other synchronous wheel one 316 drives the connecting shaft three 314 to rotate.

[0042] One end of the synchronous wheel one 316 away from the connecting shaft three 314 is fixedly connected with the half-face bevel gear 318, the connecting shaft four 321 is rotatably connected between the inner walls of the support plate 319, the outer circle of the connecting shaft four 321 and close to the half-face bevel gear 318 are symmetrically fixedly connected with the bevel gear three 320, and the two bevel gear threes 320 are in meshing connection with the half-face bevel gear 318, the connecting plate five 322 is fixedly connected to the top end of the connecting shaft four 321 and penetrates through the support plate 319, and the top end of the connecting plate five 322 is fixedly connected with the bottom end of the sliding column 323.

[0043] When the synchronous wheel one 316 rotates, the half-face bevel gear 318 fixedly connected therewith rotates, and then the two bevel gears three 320 are cooperated to drive the connecting plate five 322 to move back and forth in the guide groove 304, and the camera 324 is driven to move back and forth in the guide groove 304.

[0044] The motor 325 is fixedly connected at the center of the bottom end of the inner groove 103, the mounting column 302 is fixedly connected at the bottom end of the inner groove 103 close to the motor 325, the transmission shaft 326 is rotatably connected at the center of the bottom end of the mounting column 302, and the output end of the motor 325 is fixedly connected with the transmission shaft 326.

[0045] When the motor 325 is operated, the transmission shaft 326 fixedly connected therewith rotates.

[0046] The mounting box 329 is symmetrically fixedly connected at the two side ends of the bottom end of the inner groove 103 away from the tooth plate 102, the screw rod 331 is rotatably connected at the center of the inner wall of the bottom end of the mounting box 329, the top column 330 is slidably connected in the mounting box 329, the top column 330 is fixedly connected with the support plate 301, the top column 330 is threadedly rotatably connected with the screw rod 331, the synchronous wheel two 327 is fixedly connected with the outer circle of the transmission shaft 326 and the outer circle of the screw rod 331, and the synchronous belt two 328 is drivingly connected between the two synchronous wheel two 327.

[0047] When the transmission shaft 326 rotates, the two screw rods 331 are driven to rotate under the action of the two groups of synchronous wheel two 327 and the synchronous belt two 328, so that the two top columns 330 threadedly rotatably connected therewith are synchronously lifted under the action of the mounting box 329, and the support plate 301 fixedly connected therewith is lifted, and the threads of the two screw rods 331 are in the same direction.

[0048] Working principle: when the present application is used, the performer can stand above the two rotating tables 333, the motor 325 is operated to drive the transmission shaft 326 fixedly connected therewith to rotate, the two screw rods 331 are driven to rotate under the action of the two groups of synchronous wheel two 327 and the synchronous belt two 328, so that the two top columns 330 threadedly rotatably connected therewith are moved upward under the action of the two mounting boxes 329, the support plate 301 fixedly connected therewith and the control assembly 3 below the support plate 301 are driven to lift, and the lifting operation of the whole stage can be realized.

[0049] When the rotating wheel 309 rotates at the side end of the connecting plate 310 under the action of the two toothed plates 102, the fixedly connected connecting shaft 311 rotates, then under the action of the two synchronous wheels 316 and the synchronous belt 317, the connecting shaft 314 rotatingly connected between the connecting plate 315 and the connecting plate 313 rotates, so that the bevel gear 308 at the side end of the connecting plate 313 rotates, then under the action of the meshing bevel gear 307, the fixedly connected connecting shaft 306 rotates, so that the rotating table 333 in the placing groove 303 rotates, thereby the performer standing on the rotating table 333 rotates;

[0050] When the synchronous wheel 316 rotates, the fixedly connected half-face bevel gear 318 rotates, then under the mutual cooperation of the two bevel gears 320, the fixedly connected connecting shaft 321 of the bevel gear 320 rotates, so that the fixedly connected connecting plate 322 of the connecting shaft 321 rotates above the support plate 319, so that the fixedly connected slide column 323 of the connecting plate 322 slides in the guide groove 304, thereby the fixedly connected camera 324 follows the rotation of the rotating table 333 to offset the angle, thereby solving the problem that when the stage rotates, the cameraman needs to hold the camera to shoot on the stage, this shooting method has high requirements for the cameraman, and the shooting effect is unstable.

[0051] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A two-degree-of-freedom plus rotational motion control platform for stage performances, comprising a support platform (1), characterized in that: A light assembly (2) is fixedly connected to the top of the support platform (1) near one side. An inner groove (103) is opened inside the support platform (1) near the center. A control assembly (3) is provided at the top of the support platform (1) in the inner groove (103).

2. The two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 1, characterized in that, The lighting assembly (2) includes two base columns (201), and the bottom of the base columns (201) is fixedly connected to the top of the support platform (1). A top plate (202) is fixedly connected between the tops of the two base columns (201). Flash lamps (203) are symmetrically fixedly connected to the bottom of the top plate (202) near both sides. Toothed plates (102) are symmetrically fixedly connected to the center of both sides of the inner groove (103).

3. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 2, characterized in that, The control component (3) includes a support plate (301), and the support plate (301) slides in contact with the inner groove (103). The diameter of the support plate (301) is the same as the diameter of the inner groove (103). The support plate (301) has symmetrical placement grooves (303) near the center inside. The support plate (301) has symmetrical column grooves (332) at the center of both ends. The support plate (301) has symmetrical guide grooves (304) near one side inside.

4. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 3, characterized in that, A turntable (333) is rotatably connected inside the placement slot (303), and a sliding column (323) is slidably connected inside the guide slot (304). A camera (324) is detachably connected to the top of the sliding column (323).

5. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 4, characterized in that, A connecting frame (305) is symmetrically fixedly connected to the bottom end of the support plate (301) near the center. A connecting shaft (306) is fixedly connected to the bottom end of the turntable (333), and the bottom end of the connecting shaft (306) is rotatably connected to the top end of the connecting frame (305). A support plate (319) is fixedly connected to the end of the connecting frame (305) away from the base column (201) and at its center. The top end of the support plate (319) is fixedly connected to the connecting shaft (306) near the top end of the connecting frame (305). Then, connecting plate three (313) is connected to connecting plate four (315) at the top of the support plate (319) near connecting plate three (313). Connecting shaft one (306) is connected to bevel gear one (307) at the outer ring near connecting frame (305). Connecting plate three (313) is rotatably connected to bevel gear two (308) at the end near bevel gear one (307), and bevel gear two (308) meshes with bevel gear one (307).

6. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 5, characterized in that, A connecting plate (310) is symmetrically fixedly connected to the bottom end of the support plate (301) near the toothed plate (102). A rotating wheel (309) is rotatably connected to the end of the connecting plate (310) near the toothed plate (102), and the rotating wheel (309) meshes with the toothed plate (102). A synchronous pulley (316) is symmetrically rotatably connected to the end of the connecting plate (310) away from the rotating wheel (309) and the end of the connecting plate (315) away from the bevel gear (307). A synchronous belt (317) is connected between the two synchronous pulleys (316).

7. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 6, characterized in that, A second connecting shaft (311) is rotatably connected between the inner walls of the first connecting plate (310). One end of the second connecting shaft (311) passes through the first connecting plate (310) and is fixedly connected to the rotating wheel (309). The other end of the second connecting shaft (311) passes through the first connecting plate (310) and is fixedly connected to one of the synchronous pulleys (316). A third connecting shaft (314) is rotatably connected between the fourth connecting plate (315) and the third connecting plate (313). One end of the third connecting shaft (314) passes through the third connecting plate (313) and is fixedly connected to the second bevel gear (308). The other end of the third connecting shaft (314) passes through the fourth connecting plate (315) and is fixedly connected to another synchronous pulley (316).

8. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 7, characterized in that, One of the synchronous pulleys (316) is fixedly connected to a half-face bevel gear (318) at the end away from the connecting shaft (314). The inner wall of the support plate (319) is rotatably connected to the connecting shaft (4) (321). The outer ring of the connecting shaft (4) (321) and near the half-face bevel gear (318) are symmetrically fixedly connected to the bevel gear (320), and both bevel gears (320) mesh with the half-face bevel gear (318). The top of the connecting shaft (4) (321) passes through the support plate (319) and is fixedly connected to the connecting plate (5) (322), and the top of the connecting plate (5) (322) is fixedly connected to the bottom of the sliding column (323).

9. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 1, characterized in that, A motor (325) is fixedly connected to the center of the bottom end of the inner groove (103). A mounting column (302) is fixedly connected to the bottom end of the inner groove (103) near the motor (325). A transmission shaft (326) is rotatably connected to the center of the bottom end of the mounting column (302). The output end of the motor (325) is fixedly connected to the transmission shaft (326).

10. A two-degree-of-freedom plus rotational motion control platform for stage performances as described in claim 9, characterized in that, The bottom of the inner groove (103) is symmetrically fixedly connected to the two ends away from the toothed plate (102) on both sides. A lead screw (331) is rotatably connected to the center of the inner wall of the bottom of the mounting box (329). A top column (330) is slidably connected inside the mounting box (329), and the top column (330) is fixedly connected to the support plate (301). The top column (330) is threadedly rotatably connected to the lead screw (331). The outer ring of the lead screw (331) and the outer ring of the transmission shaft (326) are both fixedly connected to the second synchronous pulley (327). The two second synchronous pulleys (327) are connected by a second synchronous belt (328).

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