CN212584210U - Synchronous telescopic transmission device - Google Patents

Abstract

The utility model relates to a synchronous telescopic transmission device. It includes the base, the carousel, rotation center pin and two at least sliders, the carousel rotates and locates on the base, slider rectilinear sliding sets up on the base, be equipped with on the carousel and be the spiral helicine drive structure in plane, be equipped with follower structure on the slider, it is connected with the carousel transmission to rotate the center pin, drive structure and follower structure sliding fit, it rotates to rotate center pin drive carousel, drive structure drives follower structure and slides along the straight line, thereby it stretches out or contracts toward the base inward simultaneously toward the base simultaneously to drive the slider. The utility model discloses synchronous flexible transmission passes through forward rotation or reverse rotation carousel, and drive structure on the carousel drives a plurality of sliders and slides outward toward the base in or simultaneously toward the base simultaneously to make in the synchronous retraction base of a plurality of sliders or stretch out the base in step, a plurality of sliders can drive a plurality of parts synchronization action, consequently the utility model discloses control is very convenient, simple structure, with low costs, simple to operate.

Description

Synchronous telescopic transmission device

Technical Field

The utility model relates to a mechanical transmission's technical field, in particular to synchronous flexible transmission.

Background

The existing furniture (electric heating table, chair, folding dining table, etc.), medical apparatus (folding sickbed, medical detection apparatus, etc.), office equipment, teaching equipment, etc. are all provided with a plurality of stressed components and a plurality of power devices, the components are independently driven by the independent power devices, and finally the synchronous action of the components is controlled by a control system, for example, the size-variable round dining table utilizes a plurality of independent air rods to drive a plurality of sector plates to be folded or unfolded on the round dining table, but the above structure has the problems of high cost, poor synchronism, complex installation, etc. Further improvements are therefore needed in the existing power plants.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can drive a plurality of parts synchronization action, control convenient synchronous telescopic transmission.

The purpose of the utility model is realized like this:

the utility model provides a synchronous flexible transmission, includes base, carousel, rotation center pin and two at least sliders, the carousel rotates and locates on the base, slider rectilinear sliding sets up on the base, be equipped with on the carousel and be the spiral helicine drive structure in plane, be equipped with driven structure on the slider, it is connected with the carousel transmission to rotate the center pin, drive structure and driven structure sliding fit rotate the center pin drive carousel, and drive structure drives driven structure and slides along the straight line to it stretches out or contracts toward the base inward simultaneously toward the base simultaneously to drive the slider.

The utility model can be further improved as follows.

The drive structure is the drive arc wall, the driven structure is driven arch, the unsmooth cooperation of drive arc wall and driven arch, when the carousel forward (anticlockwise) rotates, the drive arc wall drives driven arch and slider straight line slip in the base, when driven arch slides to the inner of drive arc wall, driven arch and slider stop to slide inwards, carousel stall, the slider retracts in the base, on the contrary, when the carousel is reverse (clockwise) to rotate, the drive arc wall drives driven arch and slider straight line slip outside the base, when driven arch slides to the outer end of drive arc wall, driven arch and slider stop to slide outwards, carousel stall, the base is stretched out to the slider.

Of course, the drive structure also can be the drive arc arch, the driven structure correspondence is driven recess, drive arc arch and the unsmooth cooperation of driven recess, for example, the bottom surface of carousel is located to above-mentioned drive arc arch, and driven recess sets up the recess and constitutes on driven arch on original slider, drive arc arch inserts in the driven recess, unsmooth cooperation about realizing, and drive arc arch and driven recess also are sliding fit, when carousel forward rotation or antiport, drive arc arch drives the slider and simultaneously toward the outer rectilinear slip of base or the rectilinear slip toward the base in simultaneously, thereby realize that the drive slider stretches out or retracts in the base.

The driving structure is in a constant-speed spiral shape, an equiangular spiral shape or a Fibonacci spiral shape. The driving structure with the three spiral shapes can drive the driven structure to slide along a straight line, so that the sliding block is driven to simultaneously extend out of the base or simultaneously retract in the base.

The slider is located on the base along the radial slip of carousel to make slider and carousel structural design reasonable, slider and carousel motion are smooth and easy.

The base is equipped with the guide rail groove along the radial of carousel, the slider slides and locates on the guide rail groove to be located the below of carousel, the outer end in guide rail groove is opened, in the driven arch upwards stretches into the drive arc wall, thereby makes the slider slip more stable, moreover the utility model has the advantages of reasonable design.

The driving structure takes the center of the turntable as a spiral center, the inner end of the planar spiral driving structure tends to the center of the turntable, and the outer end of the planar spiral driving structure tends to the periphery of the turntable.

The turntable is provided with at least two driving structures at annular intervals, the base is provided with at least two sliding blocks at annular intervals, the driving structures are concentrically arranged, and the spiral directions of the driving structures are the same, so that the sliding blocks synchronously extend out or contract synchronously.

The bottom of base is equipped with the motor, the motor shaft and the transmission of rotation center pin of motor are connected, the motor can just reverse rotation, motor drive carousel forward rotates or reverse rotation to make the carousel rotate along counter-clockwise or clockwise, thereby realize that the drive slider contracts in to the base or stretches out outward to the base.

The top of base is equipped with the top cap, the carousel is located the top cap, be equipped with planetary reduction mechanism between carousel and the top cap, planetary reduction mechanism includes ring gear, sun gear and two at least planetary gear, the inside wall of top cap is located to the ring gear, sun gear is the rotation center pin, sun gear locates the center of carousel, planetary gear rotates and sets up on the carousel and is located between sun gear and the ring gear, planetary gear all meshes with the ring gear, sun gear simultaneously with planetary gear meshes, motor drive sun gear rotates. After the rotational speed of motor passed through planetary reduction mechanism, speed declined, thereby made the utility model discloses can drive the box that generates heat and expand or fold slowly.

The turntable is horizontally rotated and arranged on the top surface of the base, the top surface of the base is provided with a central connecting ring, the turntable is provided with a central yielding hole corresponding to the central connecting ring, and the turntable is sleeved on the central connecting ring through the central yielding hole.

The rotating central shaft, the rotating disc and the inner gear ring are coaxially arranged, so that the rotating disc can rotate coaxially with the rotating central shaft and the inner gear ring and can rotate stably.

And a first travel switch and a second travel switch are respectively arranged at the starting point and the end point of the rotation path of the turntable. When the turntable rotates to the starting point and the end point of the rotating path, the travel switch sends a signal to the motor, the motor stops rotating, and the sliding block extends out of or retracts into the base, so that the heating box is completely folded or unfolded.

Of course, the first and second travel switches may be provided at the start and end points of the slide path of the slider, respectively.

The utility model has the advantages as follows:

the utility model discloses synchronous flexible transmission passes through forward rotation or reverse rotation carousel, and drive structure on the carousel drives a plurality of sliders and slides outward toward the base in or simultaneously toward the base simultaneously to make in the synchronous retraction base of a plurality of sliders or stretch out the base in step, a plurality of sliders can drive a plurality of parts synchronization action, consequently the utility model discloses control is very convenient, simple structure, with low costs, simple to operate.

Drawings

Fig. 1 is a schematic structural view of the electric heating table of the first embodiment (the heating box is in a folded state).

Fig. 2 is a schematic structural view of the heating box of the electric heating table of the first embodiment in an unfolded state.

Fig. 3 is a schematic structural view of the heat generating device (with the mounting plate omitted) of the first embodiment in an expanded state.

Fig. 4 is a schematic structural view of the heat generating device (with the mounting plate omitted) of the first embodiment in a folded state.

Fig. 5 is a top view of fig. 3.

Fig. 6 is a top view of fig. 4.

Fig. 7 is a cross-sectional view taken at a-a in fig. 5.

Fig. 8 is a sectional view at B-B in fig. 5.

Fig. 9 is a cross-sectional view at C-C in fig. 6.

Fig. 10 is a cross-sectional view taken at D-D in fig. 6.

Fig. 11 is a schematic structural view of the synchronous telescopic transmission of the present invention in an extended state.

Fig. 12 is a schematic structural view of the synchronous telescopic transmission device of the present invention in a contracted state.

Fig. 13 is a plan view of the synchronous telescopic transmission of the present invention.

Fig. 14 is a cross-sectional view at E-E in fig. 13.

Fig. 15 is a sectional view of the synchronous telescopic transmission of the present invention in a contracted state.

Fig. 16 is a side view of the synchronous telescopic drive of the present invention in an extended state.

Fig. 17 is a sectional view at G-G in fig. 16 (the synchronous telescopic transmission is in an extended state).

FIG. 18 is a cross-sectional view of the synchronous telescoping drive of FIG. 17 in a retracted state.

Fig. 19 is a sectional view at F-F in fig. 16.

Fig. 20 is an exploded schematic view of the synchronous telescopic transmission of the present invention.

Fig. 21 is an exploded view from another angle.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

First embodiment, as shown in fig. 1 to 21, an electric heating table comprises a panel 81, a bottom plate 83, a controller (not shown in the figure) and four legs 82, wherein the panel 81 is located above the bottom plate 83, the top ends of the four legs 82 are connected with the bottom of the panel 81, the bottom ends of the four legs 82 are connected with the bottom plate 83, and the controller is arranged on the panel 81. The bottom of panel 81 is equipped with the device 9 that generates heat, the device 9 that generates heat includes mounting panel 911, installation frame 91, four box 90 and synchronous telescopic transmission 1 that generate heat, mounting panel 911 fixed connection is in the top of four table legs to be located the below of panel 81, the bottom surface of mounting panel 911 is located to installation frame 91, of course, installation frame 91 also can direct fixed connection in the bottom of panel 81 (omit mounting panel 911).

The heating box 90 rotates along the vertical direction and locates on the installation frame 91, be equipped with the heat-generating body on the box 90 that generates heat, synchronous telescopic transmission 1 is located on the installation frame 91, synchronous telescopic transmission 1 includes base 10, top cap 2, rotation center pin, carousel 4, motor 3 and four sliders 6, base 10 is located on the installation frame 91, the top surface of base 10 is located to top cap 2, carousel 4 level is rotated and is located on base 10, carousel 4 is located top cap 2, four sliders 6 annular equal intervals set up on base 10, four sliders 6 rectilinear sliding sets up on base 10, it is the spiral helicine drive structure 41 in plane to correspond slider 6 annular equal interval on carousel 4, be equipped with driven structure 61 on slider 6, be equipped with connecting rod 95 between the outer end of slider 6 and the box 90 that generates heat, 951, the both ends of connecting rod 95, 951 respectively with slider 6, generate heat box 90 and rotate and be connected, drive structure 41 and follower 61 sliding fit, motor 3 locates the bottom surface of base 10 to be connected with the transmission of rotation center pin, motor 3's motor shaft and rotation center pin transmission are connected, motor 3 drive carousel 4 rotates, drive structure 41 drives follower 61 and slides along the straight line, thereby it stretches out simultaneously toward base 10 to drive four sliders 6, so that generate heat box 90 upwards overturn and fold, perhaps drive four sliders 6 and contract toward base 10 simultaneously, so that generate heat box 90 overturn downwards and expand. Therefore, the utility model discloses a synchronous flexible transmission can drive a plurality of parts and do the action in step, consequently the utility model discloses a synchronous flexible transmission also can use on other devices, realizes different functions, for example, is used for driving a plurality of lifting slide blocks to go up and down in step or is used for driving a plurality of telescopic links to stretch out and draw back in step.

Of course the utility model discloses also can omit the motor, directly set up the handle on the base, the handle is connected with the rotation center pin transmission, and the user stretches out or contracts simultaneously when also can realizing a plurality of sliders through handle manual drive carousel forward or antiport.

As a more specific technical solution of the present invention.

Of course, the utility model discloses can increase or reduce the quantity of slider 6 and drive structure 41, for example, according to the actual conditions of the box 90 that generates heat the utility model discloses also can set up two sliders 6 in the symmetry on base 10 to promote two box 90 that generate heat respectively and fold or expand. Furthermore, the utility model discloses also can design a spiral helicine drive structure 41 in plane on carousel 4, the equidistant setting on the base of 6 annular of four sliders, and the driven structure 61 of four sliders 6 all is located this drive structure 41 to realize that four sliders 6 of a drive structure 41 drive slide simultaneously.

Drive structure 41 is the drive arc wall, driven structure 61 is driven arch, drive arc wall and the unsmooth cooperation of driven arch, when carousel 4 forward rotation (anticlockwise rotates), the drive arc wall drives driven arch and slider 6 and simultaneously toward base 10 in the rectilinear slip, when driven arch slides to the inner of drive arc wall, driven arch and slider 6 stop to slide inwards, carousel 4 stall, slider 6 retracts in base 10, on the contrary, when carousel 4 antiport (rotate along the clockwise), the drive arc wall drives driven arch and slider 6 and simultaneously toward the outer rectilinear slip of base 10, when driven arch slides to the outer end of drive arc wall, driven arch and slider 6 stop to slide outwards, carousel 4 stall, slider 6 stretches out base 10.

The driving arc-shaped groove is in a constant-speed spiral shape, an equiangular spiral shape or a Fibonacci spiral shape. The driving arc-shaped grooves in the three spiral shapes can drive the driven protrusions to slide along a straight line, so that the sliding block 6 is driven to simultaneously extend out of the base 10 or simultaneously retract into the base 10.

Four sliders 6 are located on base 10 along the radial slip of carousel 4 to make slider 6 and carousel 4 structural design reasonable, slider 6 and carousel 4 motion are smooth and easy.

The base 10 is equipped with four guide rail grooves 13 along the radial of carousel 4, four sliders 6 slide and locate on corresponding guide rail groove 13 to be located the below of carousel 4, four guide rail grooves 13's outer end is opened, from the protruding drive arc wall that upwards stretches into of follow in to make slider 6 slide more stably, four sliders 6 stretch out the guide rail groove simultaneously or retract the guide rail inslot simultaneously.

The four driving arc-shaped grooves take the center of the rotary table 4 as a spiral center, the inner ends of the driving arc-shaped grooves tend to the center of the rotary table 4, and the outer ends of the driving arc-shaped grooves tend to the periphery of the rotary table 4.

The four driving arc-shaped grooves are concentrically arranged, and the spiral directions of the four driving arc-shaped grooves are the same, so that the sliding blocks 6 synchronously extend out or contract.

The motor shaft of motor is connected with the transmission of rotation center pin, motor 3 can just reverse rotation, motor 3 drive carousel 4 forward rotation or reverse rotation to make carousel 4 rotate along anticlockwise or clockwise, thereby realize driving slider 6 to contract in base 10 or stretch out to base 10 outward.

The horizontal rotation of carousel 4 is located on the top surface of base 10, the top surface of base 10 is equipped with central clamping ring 14, carousel 4 corresponds central clamping ring 14 and is equipped with the center hole 43 of stepping down, carousel 4 is located on central clamping ring 14 through the center hole 43 cover of stepping down, the bottom of central clamping ring 14 is located to the motor. The periphery of the rotating disc is provided with a stroke collision block 44.

The rotation central shaft, the turntable 4 and the inner gear ring are coaxially arranged, so that the turntable 4 can rotate coaxially with the rotation central shaft and the inner gear ring and can rotate stably.

The starting point and the end point of the rotating path of the rotating disc 4 are respectively provided with a first travel switch 7 and a second travel switch 71. When the stroke collision block 44 of the rotary disc 4 rotates to the starting point and the end point of the rotating path and the stroke collision block 44 collides with the stroke switch, the stroke switch sends a signal to the motor 3, the motor 3 stops rotating, and the sliding block 6 extends out of or retracts into the base 10, so that the heating box 90 is completely folded or unfolded.

Of course, the first and second stroke switches 7 and 71 may be provided at the start and end points of the slide path of the slider, respectively.

A planetary reduction mechanism 5 is arranged between the turntable 4 and the top cover 2, the planetary reduction mechanism 5 comprises an inner gear ring 21, a sun gear 31 and at least two planetary gears 52, the inner gear ring 21 is arranged on the inner side wall of the top cover 2 along the circumferential direction of the top cover, the sun gear 31 is the central rotating shaft, the sun gear is arranged at the center of the turntable, the planetary gears 52 are rotatably arranged on the upper surface of the turntable 4 and are positioned between the sun gear and the inner gear ring, the planetary gears 52 are all meshed with the inner gear ring 21, the sun gear is simultaneously meshed with the planetary gears, the motor drives the sun gear 31 to rotate, the sun gear 31 is simultaneously meshed with the planetary gears 52, the sun gear 31 drives the two planetary gears 52 to rotate, the two planetary gears 52 drive the turntable 4 to rotate to realize speed reduction, and the rotating speed of the motor passes through the, the speed descends, thereby making the utility model discloses can drive the box that generates heat and expand or fold slowly.

The top cap 2 is fixed on the base 10 through a plurality of screws (not shown in the figure), the peripheral annular interval of top cap 2 is equipped with a plurality of connection screw hole posts 22, is equipped with screw 23 on the connection screw hole post 22, the periphery of base 10 corresponds and connects screw hole post 22 annular interval and is equipped with a plurality of through-holes 12, a plurality of screws upwards pass through-hole 12 on the base 10 to with the connection screw hole post 22 threaded connection of top cap 2, the periphery of base 10 corresponds through-hole 12 annular interval and is equipped with a plurality of location arc 11, location arc 11 is located by through-hole 12, it supports and leans on location arc 11 to connect screw hole post 22, a plurality of location arc 11 wrap the lateral wall of a plurality of connection screw hole posts to realize the top cap of fixing a position in advance, make screw 23 align with through-hole 12, thereby make things convenient for workman's assembly.

As a more detailed technical solution of the present invention.

The top of the heating box 90 is rotatably connected to the mounting frame 91.

The top of the heating box 90 is provided with a lever structure 96, the outer ends of the connecting rods 95 and 951 are rotatably connected with one end of the lever structure 96, and the other end of the lever structure 96 is connected with the heating box 90.

The heating box 90 is rotatably disposed on the mounting frame 91 through a horizontal rotating shaft 97, and the horizontal rotating shaft 97 is disposed on the lever structure 96.

The installation frame 91 is equipped with folding space 99 of stepping down corresponding to the box 90 that generates heat to generate heat the box 90 and can upwards overturn the back, installation frame 91 does not produce the interference to the rotation of generating heat box 90, and the box 90 that generates heat can fold in folding space 99 of stepping down.

The heating box 90 includes a casing 98, a heating body 93 and a heat reflection cover 92, a heat radiation hole 94 is arranged on the front surface of the casing 98, the heat reflection cover 92 is arranged in the casing 98, the heating body 93 is positioned in the heat reflection cover 92, and the top of the casing 98 is rotatably connected on the installation frame 91. The utility model discloses the during operation, the front of box 90 that generates heat is towards the user, and heat-generating body 93 generates heat and produces the heat, and the heat reflects louvre 94 out by the bowl, and of course, the heat of heat-generating body 93 also can be transmitted out through the mode of heat-conduction, convection current to the realization is for the user heating.

The utility model discloses a theory of operation is:

when a user sits around the electric heating table and starts the electric heating table to heat, a controller of the electric heating table starts a motor 3, the motor 3 drives a sun gear 31 to rotate in a forward direction (rotate in an anticlockwise direction), the sun gear 31 drives two planet gears 52 to rotate, one planet gear 52 rotates in the anticlockwise direction, the other planet gear 52 rotates in a clockwise direction, the two planet gears 52 drive a turntable 4 to rotate in the forward direction (rotate in the anticlockwise direction), four driving arc-shaped grooves on the turntable 4 respectively drive four driven protrusions, four connecting rods 95, 951 and four sliders 6 to linearly slide towards the inside of a base 10 along the radial direction of the turntable, the four sliders 6 pull the connecting rods 95, 951 inwards, the sliders 6 pull the top of a heating box 90 through the connecting rods 95, 951, so that the heating box cannot be rapidly turned downwards, the bottom of the heating box 90 is pulled by the connecting rods, slowly overturn downwards and expand, when the piece 44 is met to the stroke of carousel when second travel switch 71, second travel switch 71 sends a signal and gives motor 3 and controller, motor 3 stops rotatoryly, driven arch and slider 6 stop to slide inwards, carousel 4 stall, slider 6 retraction base 10 is interior, driven arch slides to the inner of drive arc wall, box 90 that generates heat is vertical form, the front of box 90 that generates heat is towards the user, afterwards, the heat-generating body 93 that the controller control generated heat in the box 90 generates heat, the heat that heat-generating body 93 produced gives out louvre 94, thereby realize giving user's heating.

On the contrary, when the user closes the electric heating table, the controller controls the heating unit 93 to stop working, the controller restarts the motor 3, the motor 3 drives the sun gear 31 and the two planetary gears 52 to rotate, the rotation directions of the two planetary gears 52 are still opposite, the two planetary gears 52 drive the turntable 4 to rotate in reverse (clockwise), the four driving arc-shaped grooves on the turntable 4 drive the four driven protrusions, the four connecting rods 95, 951 and the four sliding blocks 6 to linearly slide outwards the base 10 along the radial direction of the turntable, the four sliding blocks 6 push the four connecting rods 95, 951 outwards, the sliding blocks 6 push the top of the heating box 90 through the connecting rods 95, 951, so that the bottom of the heating box 90 slowly overturns upwards, when the stroke of the turntable touches the position of the first stroke switch 7, the first stroke switch 7 sends a signal to the motor 3 and the controller, the motor 3 stops rotating, and the driven protrusions, Four connecting rods 95, 951 and four sliders 6 stop sliding outwards, the driven protrusion slides to the outer end of the driving arc-shaped groove, the turntable 4 stops rotating, the sliders 6 extend out of the base 10, and the connecting rods 95 and 951 push against the top of the heating box, so that the bottom of the heating box cannot be turned downwards due to gravity, and the heating box 90 is folded in the folding abdicating space 99.

Of course, the utility model discloses a motor can drive the box that generates heat and stop rotating at its arbitrary position of rotation angle within range to realize the control and generate heat the angle of box 90 upsets, finally realize the utility model discloses can both heat the heating at arbitrary angle.

The second embodiment is similar to the first embodiment, and the only difference is that: the drive structure of synchronous telescopic transmission in the second embodiment is that the drive arc is protruding, the drive arc arch is the plane heliciform, driven structure 61 correspondence is driven recess, the protruding and driven recess unsmooth cooperation of drive arc, the drive arc of this embodiment is the bottom surface of locating carousel 4, and driven recess is set up middle recess and constitutes at the protruding top of driven on slider 6 in the first embodiment, the protruding middle recess that inserts down of drive arc, unsmooth cooperation about the realization, and the protruding and middle recess of drive arc also is sliding fit, when carousel 4 forward rotation or counter-rotation, the protruding drive arc drives polylith slider 6 and slides towards base interior straight line simultaneously or towards base 10 outer straight line simultaneously, thereby realize that drive polylith slider 6 retracts into base 10 simultaneously or stretches out the base simultaneously.

Claims (10)

1. The utility model provides a synchronous flexible transmission, includes base, carousel, rotation center pin and two at least sliders, the carousel rotates and locates on the base, slider rectilinear sliding sets up on the base, be equipped with on the carousel and be the spiral helicine drive structure in plane, be equipped with driven structure on the slider, it is connected with the carousel transmission to rotate the center pin, drive structure and driven structure sliding fit rotate the center pin drive carousel, and drive structure drives driven structure and slides along the straight line to it stretches out or contracts toward the base inward simultaneously toward the base simultaneously to drive the slider.

2. The synchronous telescoping drive of claim 1, wherein the driving structure is a driving arcuate slot and the driven structure is a driven projection, the driving arcuate slot and the driven projection being in concave-convex engagement.

3. The synchronous telescoping drive of claim 1, wherein the drive feature is a drive arcuate projection and the driven feature is a driven recess, the drive arcuate projection and driven recess being in a male-female engagement.

4. A synchronous telescopic drive as claimed in claim 2 or 3, wherein the drive formation is in the form of a constant velocity helix or equiangular helix or a fibonacci helix.

5. The synchronous telescopic transmission device as claimed in claim 4, wherein the sliding block is slidably provided on the base in a radial direction of the turntable.

6. The synchronous telescopic transmission device as claimed in claim 5, wherein at least two driving structures are arranged on the rotary plate at intervals, at least two sliding blocks are arranged on the base at intervals, the driving structures are all concentrically arranged, and the spiral directions of the driving structures are the same.

7. The synchronous telescopic driving device as claimed in claim 6, wherein a motor is provided at the bottom of the base, a motor shaft of the motor is in transmission connection with the rotating central shaft, and the motor drives the turntable to rotate.

8. The synchronous telescopic driving device as claimed in claim 2, wherein the base is provided with a guide rail groove along a radial direction of the turntable, the slider is slidably disposed on the guide rail groove and located below the turntable, an outer end of the guide rail groove is open, and the driven protrusion extends upward into the driving arc-shaped groove.

9. The synchronous telescopic transmission device according to claim 7, wherein a top cover is provided on the top of the base, the rotary table is located in the top cover, a planetary reduction mechanism is provided between the rotary table and the top cover, the planetary reduction mechanism includes an inner gear ring, a sun gear and at least two planetary gears, the inner gear ring is provided on the inner side wall of the top cover, the sun gear is the central axis of rotation, the sun gear is provided at the center of the rotary table, the planetary gears are rotatably provided on the rotary table and located between the sun gear and the inner gear ring, the planetary gears are all engaged with the inner gear ring, the sun gear is simultaneously engaged with the planetary gears, and the motor drives the sun gear to rotate.

10. A synchronous telescopic drive as claimed in claim 1, wherein a first travel switch and a second travel switch are provided in the path of rotation of said rotary plate.

Images