阅读说明：本技术 一种旋转伸缩电动餐桌 (Rotary telescopic electric dining table ) 是由 王玉昌 于 2020-06-30 设计创作，主要内容包括：本发明涉及智能家居技术领域,尤其涉及一种旋转伸缩电动餐桌,包括桌脚,所述桌脚的顶部设置有可向外延展桌面边沿或向内收纳桌面边沿的桌面活动架,所述桌脚的内部设置有用于驱动桌面活动架旋转与升降的动力机构。本发明通过旋转伸缩动作来调节桌面大小,实现方桌与圆桌之间的切换使用,操作简单方便,占用空间小,满足不同使用需求。(The invention relates to the technical field of intelligent home furnishing, in particular to a rotary telescopic electric dining table which comprises table legs, wherein the tops of the table legs are provided with table top movable frames capable of extending the edges of a table top outwards or accommodating the edges of the table top inwards, and power mechanisms used for driving the table top movable frames to rotate and lift are arranged inside the table legs. The size of the table top is adjusted through rotary telescopic action, switching use between the square table and the round table is achieved, operation is simple and convenient, occupied space is small, and different use requirements are met.)

1. The utility model provides a rotatory electronic dining table that stretches out and draws back, includes the table foot, its characterized in that: the top of table foot is provided with the desktop adjustable shelf that can outwards extend desktop border or inwards accomodate the desktop border, the inside of table foot is provided with the power unit that is used for driving the desktop adjustable shelf rotation and goes up and down.

2. A rotary telescopic electric dining table as claimed in claim 1, wherein: the power mechanism comprises a cam driving component and a motor assembly in driving connection with the cam driving component, the cam driving component comprises a cam sleeve, a spiral groove is formed in the outer wall of the cam sleeve, a guide sleeve is arranged at the top of the cam sleeve, an oblique guide groove is formed in the outer side wall of the guide sleeve, a clutch and a lifting piece connected with the clutch are arranged in the cam sleeve, the clutch is provided with a cam block in sliding connection with the spiral groove, and the lifting piece is provided with a guide rod in sliding connection with the oblique guide groove.

3. A rotary telescopic electric dining table as claimed in claim 2, wherein: the range of the inclination angle of the inclined guide groove is 30-80 degrees.

4. A rotary telescopic electric dining table as claimed in claim 2, wherein: the clutch comprises an inner sleeve, the cam block is arranged outside the inner sleeve, a connecting shaft sleeve is arranged at the bottom of the inner sleeve, an inner threaded hole is formed in the middle of the upper connecting shaft sleeve, a first friction gasket is arranged at the top of the upper connecting shaft sleeve, a second friction gasket is arranged at the bottom of the inner sleeve, a spring is arranged in the inner sleeve, a pre-tightening screw is arranged in the spring, the upper connecting shaft sleeve is in threaded connection with the pre-tightening screw through the inner threaded hole, an inserting block is arranged at the top of the inner sleeve, and the inserting block is inserted into the lifting piece.

5. The dining table as claimed in claim 4, wherein the table further comprises: go up the connecting axle sleeve and evenly be provided with the first locating piece of a plurality of, first constant head tank with first locating piece joint is seted up to first friction gasket, the inner skleeve evenly is provided with a plurality of second locating piece, second friction gasket sets up the second constant head tank with second locating piece joint.

6. The dining table as claimed in claim 4, wherein the table further comprises: the motor assembly comprises a driving motor, the output end of the driving motor is in driving connection with a gear box, the gear box comprises a lower shell, the lower shell is provided with a first worm and a power output shaft, the first worm is connected with an output shaft of the driving motor, the first worm and the power output shaft are both vertically arranged with the lower shell, a second worm is horizontally arranged in the lower shell, one end of the second worm is provided with a first worm wheel, the first worm wheel is meshed with the first worm, the bottom of the power output shaft is connected with a second worm wheel, the second worm wheel is meshed with the second worm, and the top of the power output shaft is connected with a sun wheel.

7. A rotary telescopic electric dining table as claimed in claim 6, wherein: be provided with planetary drive portion between motor assembly and the cam drive subassembly, planetary drive portion includes the mount pad, the middle part of mount pad has cup jointed down the connecting axle sleeve, connecting axle sleeve and last connecting axle sleeve connection down, the bottom of mount pad is provided with the last casing with lower shell coupling, it is provided with the planet carrier to go up the casing, the bottom of connecting axle sleeve is provided with a plurality of mounting hole down, and a plurality of mounting hole is triangle-shaped and arranges the distribution, the axis of rotation has been installed to the mounting hole, axis of rotation connection has the planet wheel, sun gear and planet wheel meshing, planet wheel and planet carrier meshing.

8. A rotary telescopic electric dining table as claimed in claim 2, wherein: the desktop movable frame comprises a cross-shaped support frame, a first support plate and a second support plate are arranged on two sides of the cross-shaped support frame in parallel, a first guide rail and a second guide rail are respectively arranged outside the first support plate and the second support plate, the middle of the cross-shaped support frame is connected with a cam sleeve, an assembly seat connected with the main desktop is arranged at the top of the cross-shaped support frame, and a connecting shaft is connected between the assembly seat and the cross-shaped support frame.

9. A rotary telescopic electric dining table as claimed in claim 8, wherein: the bottom of cross supporting rack is provided with rotates the seat, the junction between rotation seat and the cam piece is provided with the mounting screw, the both sides of rotating the seat are provided with first power arm and second power arm respectively, first power arm and second power arm are connected with first transmission arm and second transmission arm respectively, first transmission arm and second transmission arm are connected with first expansion bracket and second expansion bracket respectively, first expansion bracket is provided with the first slider with first guide rail sliding connection, the second expansion bracket is provided with the second slider with second guide rail sliding connection.

Technical Field

The invention relates to the technical field of smart homes, in particular to a rotary telescopic electric dining table.

Background

When having a dinner at ordinary times at present family, generally be not more than five people, only need a traditional dining table can, but when having a dinner with family and friends of family in a year, because traditional dining table all can not adjust the desktop size, consequently can't satisfy the user demand that many people had a dinner simultaneously, can only purchase the major diameter table separately, install the table additional and place on the dining table, take off after having a dinner and place alone again, this kind of table will occupy living space when not using, be not convenient for accomodate, even there is the place to lay, also can influence the aesthetic property and the clean and tidy nature that indoor arrangement set up, or purchase a large tracts of land round table again, both waste money and money, occupy the very big volume space in living room, consequently, need one kind can freely adjust the desktop size wanting urgently, occupation space is little, satisfy the dining table of different user demands.

Disclosure of Invention

The invention aims to provide a rotary telescopic electric dining table, which is simple and convenient to operate, occupies small space and meets different use requirements, wherein the size of a table top is adjusted through rotary telescopic action, the switching use between a square table and a round table is realized, and the rotary telescopic electric dining table is simple and convenient to operate.

In order to achieve the purpose, the rotary telescopic electric dining table comprises table legs, wherein the top of each table leg is provided with a table top movable frame capable of extending the edge of a table top outwards or accommodating the edge of the table top inwards, and a power mechanism for driving the table top movable frame to rotate and lift is arranged inside each table leg.

Preferably, the power mechanism comprises a cam driving component and a motor assembly in driving connection with the cam driving component, the cam driving component comprises a cam sleeve, a spiral groove is formed in the outer wall of the cam sleeve, a guide sleeve is arranged at the top of the cam sleeve, an oblique guide groove is formed in the outer side wall of the guide sleeve, a clutch and a lifting piece connected with the clutch are arranged in the cam sleeve, the clutch is provided with a cam block in sliding connection with the spiral groove, and the lifting piece is provided with a guide rod in sliding connection with the oblique guide groove.

Preferably, the inclined angle of the inclined guide groove ranges from 30 degrees to 80 degrees.

Preferably, the clutch includes the inner skleeve, the cam piece sets up in the outside of inner skleeve, the bottom of inner skleeve is provided with connecting axle sleeve, the middle part of going up connecting axle sleeve is provided with the internal thread hole, the top of going up connecting axle sleeve is provided with first friction gasket, the bottom of inner skleeve is provided with second friction gasket, be provided with the spring in the inner skleeve, be provided with the pretension screw in the spring, go up connecting axle sleeve and pass through internal thread hole and pretension screw threaded connection, the top of inner skleeve is provided with the grafting piece, the grafting piece is pegged graft with the lift piece.

Preferably, go up the connecting axle sleeve and evenly be provided with the first locating piece of a plurality of, first constant head tank with first locating piece joint is seted up to first friction gasket, the inner skleeve evenly is provided with a plurality of second locating piece, second friction gasket sets up the second constant head tank with second locating piece joint.

Preferably, the motor assembly includes driving motor, driving motor's output drive is connected with the gear box, the gear box includes lower casing, lower casing is provided with first worm and power output shaft, first worm and driving motor's output shaft, first worm, power output shaft all set up with lower casing is perpendicular, the internal level of inferior valve is provided with the second worm, the one end of second worm is provided with first worm wheel, first worm wheel and first worm meshing, power output shaft's bottom is connected with the second worm wheel, the second worm wheel meshes with the second worm, power output shaft's top is connected with the sun gear.

Preferably, be provided with planetary drive portion between motor assembly and the cam drive subassembly, planetary drive portion includes the mount pad, the middle part of mount pad has cup jointed down the connecting axle sleeve, connecting axle sleeve and last connecting axle sleeve connection down, the bottom of mount pad is provided with the last casing with lower shell coupling, it is provided with the planet carrier to go up the casing, the bottom of connecting axle sleeve is provided with a plurality of mounting hole down, and a plurality of mounting hole is the triangle-shaped range and distributes, the axis of rotation has been installed to the mounting hole, axis of rotation connection has the planet wheel, sun gear and planet wheel meshing, planet wheel and planet carrier meshing.

Preferably, the desktop movable frame comprises a cross-shaped support frame, a first support plate and a second support plate are arranged on two sides of the cross-shaped support frame in parallel, a first guide rail and a second guide rail are respectively arranged outside the first support plate and the second support plate, the middle of the cross-shaped support frame is connected with the cam sleeve, an assembly seat connected with the main desktop is arranged at the top of the cross-shaped support frame, and a connecting shaft is connected between the assembly seat and the cross-shaped support frame.

Preferably, the bottom of the cross-shaped support frame is provided with a rotating base, a connecting part between the rotating base and the cam block is provided with a mounting screw, two sides of the rotating base are respectively provided with a first power arm and a second power arm, the first power arm and the second power arm are respectively connected with a first transmission arm and a second transmission arm, the first transmission arm and the second transmission arm are respectively connected with a first expansion bracket and a second expansion bracket, the first expansion bracket is provided with a first sliding block connected with the first guide rail in a sliding manner, and the second expansion bracket is provided with a second sliding block connected with the second guide rail in a sliding manner.

The invention has the beneficial effects that: the utility model provides a rotatory electronic dining table that stretches out and draws back, includes the table foot, the top of table foot is provided with the desktop adjustable shelf that can outwards extend the desktop border or inwards accomodate the desktop border, the inside of table foot is provided with and is used for driving the rotatory power unit with the lift of desktop adjustable shelf.

During the use, the table foot is fixed place steadily on ground, installs and does rotation action and lift action at the inside power unit drive desktop adjustable shelf of table foot, and the desktop adjustable shelf passes through inner structure's cooperation transmission, and then orders about the desktop adjustable shelf outwards to extend the desktop border at rotatory in-process that rises to and inwards accomodate the desktop border at the rotatory in-process that descends, realize the form transform between square table and the round table. The size of the table top is adjusted through rotary telescopic action, switching use between the square table and the round table is achieved, operation is simple and convenient, occupied space is small, and different use requirements are met.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the movable frame of the desktop of the present invention.

Fig. 3 is a schematic bottom view of the movable frame of the desktop of the present invention.

Fig. 4 is a schematic structural diagram of the power mechanism of the present invention.

Fig. 5 is an exploded view of the cam driving assembly of the present invention.

FIG. 6 is an exploded view of the clutch of the present invention.

FIG. 7 is another schematic perspective exploded view of the clutch of the present invention.

Fig. 8 is a schematic structural view of the motor assembly of the present invention.

Fig. 9 is a schematic structural view of the planetary transmission part of the present invention.

Fig. 10 is an exploded view of the planetary gear of the present invention.

The reference numerals include:

1-Table leg

2-table top movable frame 21-cross supporting frame 22-first supporting plate

23-second bearing plate 24-first guide 25-second guide

26-assembly seat 27-connecting shaft 28-rotating seat

281-first power arm 282-second power arm 283-first drive arm

284-second transmission arm 285-first expansion bracket 286-second expansion bracket

287-first slider 288-second slider 29-mounting screw

3-Power mechanism

31-cam drive assembly 311-cam sleeve 312-spiral groove

313-guide sleeve 314-oblique guide groove 315-clutch

3151 inner sleeve 31511 and secondary positioning block

3152 upper connecting shaft sleeve 31521 and first positioning block

3153 internal thread hole 3154, first friction pad 31541, and first positioning groove

3155 second friction pad 31551 second positioning groove

3156 spring 3157 pretightening screw 3158 plug-in block

316-lifting member 317-cam block 318-guide rod

32-motor assembly 321-driving motor 322-gear box

3221-lower shell 3222-first worm 3223-power output shaft

3224 second worm 3225, first worm wheel 3226, second worm wheel

3227-Sun gear

33-planetary transmission part 331-mounting seat 332-lower connecting shaft sleeve

3321 mounting hole 3322 rotating shaft 3323 planet wheel

333-upper case 334-planet carrier.

Detailed Description

The present invention is described in detail below with reference to the attached drawings.

As shown in fig. 1 to 10, the rotary telescopic electric dining table of the present invention includes table legs 1, wherein a table top movable frame 2 capable of extending the edge of the table top outwards or accommodating the edge of the table top inwards is disposed at the top of the table legs 1, and a power mechanism 3 for driving the table top movable frame 2 to rotate and lift is disposed inside the table legs 1.

During the use, table foot 1 is fixed steadily to be placed on ground, installs and is doing rotation action and lift action at 1 inside power unit 3 drive desktop adjustable shelf 2 of table foot, and desktop adjustable shelf 2 is through inner structure's cooperation transmission, and then orders about desktop adjustable shelf 2 outwards to extend the desktop border at the rotatory in-process that rises to and accomodate the desktop border at the rotatory in-process that descends inwards, realize the form transform between square table and the round table. The size of the table top is adjusted through rotary telescopic action, switching use between the square table and the round table is achieved, operation is simple and convenient, occupied space is small, and different use requirements are met.

As shown in fig. 1, 4 and 5, the power mechanism 3 of this embodiment includes a cam driving component 31 and a motor assembly 32 drivingly connected to the cam driving component 31, where the cam driving component 31 includes a cam sleeve 311, an outer wall of the cam sleeve 311 is provided with a spiral groove 312, a top of the cam sleeve 311 is provided with a guide sleeve 313, an outer side wall of the guide sleeve 313 is provided with an oblique guide groove 314, the cam sleeve 311 is provided with a clutch 315 and a lifting member 316 connected to the clutch 315, the clutch 315 is provided with a cam block 317 slidably connected to the spiral groove 312, and the lifting member 316 is provided with a guide rod 318 slidably connected to the oblique guide groove 314. Specifically, the cam sleeve 311 is kept stationary, the clutch 315 is assembled with the table top movable frame 2 through the cam block 317, the motor assembly 32 drives the cam driving assembly 31 to rotate through the planetary transmission part 33, and then the clutch 315 is driven to rotate, the clutch 315 drives the table top moving frame 2 to rotate through the cam block 317 on one hand, the clutch 315 also drives the lifting member 316 to rotate synchronously to generate torque on the other hand, the lifting member 316 rotates and ascends or rotates and descends along two anti-symmetrically arranged inclined guide slots 314 arranged on the outer side wall of the guide sleeve 313 through the guide rod 318, accordingly, an upward pulling force or a downward pushing force is generated on the clutch 315, and finally, the purpose that the cam driving assembly 31 drives the table top movable frame 2 to rotate and lift is achieved by driving the clutch 315 to rotate spirally and lift up and down along the spiral groove 312.

As shown in fig. 4 and 5, the inclined guide groove 314 of the present embodiment has an inclination angle ranging from 30 degrees to 80 degrees. Specifically, the range of the inclination angle of the inclined guide groove 314 is 30-80 degrees, which is beneficial to decomposing the total rotating power into a climbing component force or a descending component force along the inclined guide groove 314, and further correspondingly generating an upward pulling force or a downward pushing force on the clutch 315, and finally realizing that the clutch 315 drives the cam block 317 to perform spiral rotation and up-and-down lifting actions along the spiral groove 312, so that the motor assembly 32 is in driving connection with the table top movable frame 2 through the cam block 317 of the cam driving component 31, and further drives the table top movable frame 2 to perform rotation and lifting actions.

As shown in fig. 5, 6 and 7, the clutch 315 of this embodiment includes an inner sleeve 3151, the cam block 317 is disposed outside the inner sleeve 3151, an upper connecting sleeve 3152 is disposed at the bottom of the inner sleeve 3151, an internal threaded hole 3153 is disposed in the middle of the upper connecting sleeve 3152, a first friction washer 3154 is disposed at the top of the upper connecting sleeve 3152, a second friction washer 3155 is disposed at the bottom of the inner sleeve 3151, a spring 3156 is disposed in the inner sleeve 3151, a pre-tightening screw 3157 is disposed in the spring 3156, the upper connecting sleeve 3152 is in threaded connection with the pre-tightening screw 3157 through the internal threaded hole 3153, an insertion block 3158 is disposed at the top of the inner sleeve 3151, and the insertion block 3158 is inserted into the lifting member 316. Specifically, the motor assembly 32 drives the cam driving assembly 31 to rotate through the planetary transmission portion 33, and further drives the table top moving frame 2 to rotate and lift through the cam driving assembly 31, the inner sleeve 3151 drives the cam block 317 to move to the maximum moving position of the spiral groove 312 to contact and abut against, so that the clutch 315 cannot continue to rotate, but the motor assembly 32 still rotates and drives the upper connecting shaft sleeve 3152 to continue to rotate, the upper connecting shaft sleeve 3152 and the second friction pad 3155 of the inner sleeve 3151 rub against each other through the first friction pad 3154 to rotate, so as to limit the torque transmitted by the transmission system in a slipping manner, when the control system monitors that the driving power of the motor assembly 32 gradually increases, the overload operation of the motor assembly 32 is stopped, the mechanical structure is prevented from being damaged due to excessive operation, good working safety is ensured, the pretension adjusting screw 3157 is screwed into the height position of the internal thread hole 3153 of the upper connecting shaft sleeve 3152, and then through the pretightening screw 3157 pressfitting spring 3156 and adjust the pretightening force of spring 3156, improve buffering damping performance, also can further adjust the contact laminating degree between first friction gasket 3154 and the second friction gasket 3155 simultaneously, it is convenient effective to adjust.

As shown in fig. 6 and 7, the upper coupling sleeve 3152 of this embodiment is uniformly provided with a plurality of first positioning blocks 31521, the first friction pad 3154 is provided with a first positioning groove 31541 engaged with the first positioning block 31521, the inner sleeve 3151 is uniformly provided with a plurality of second positioning blocks 31511, and the second friction pad 3155 is provided with a second positioning groove 31551 engaged with the second positioning block 31511. Specifically, the upper connecting shaft sleeve 3152 is provided with three first positioning blocks 31521 distributed in a triangular shape, the first friction gasket 3154 is correspondingly connected with the three first positioning blocks 31521 in a clamping manner through three first positioning grooves 31541, the inner sleeve 3151 is provided with three second positioning blocks 31511 distributed in a triangular shape, the second friction gasket 3155 is correspondingly connected with the three second positioning blocks 31511 in a clamping manner through three second positioning grooves 31551, and therefore the first friction gasket 3154 is stably connected to the upper connecting shaft sleeve 3152, and the second friction gasket 3155 is stably connected to the inner sleeve 3151.

As shown in fig. 4 and 8, the motor assembly 32 of this embodiment includes a driving motor 321, an output end of the driving motor 321 is drivingly connected with a gear box 322, the gear box 322 includes a lower housing 3221, the lower housing 3221 is provided with a first worm 3222 and a power output shaft 3223, the first worm 3222 is connected with an output shaft of the driving motor 321, both the first worm 3222 and the power output shaft 3223 are vertically arranged with the lower housing 3221, a second worm 3224 is horizontally arranged in the lower housing 3221, one end of the second worm 3224 is provided with a first worm wheel 3225, the first worm wheel 3225 is engaged with the first worm 3222, a second worm wheel 3226 is connected to a bottom of the power output shaft 3223, the second worm wheel 3226 is engaged with the second worm 3224, and a sun wheel 3227 is connected to a top of the power output shaft 3223. Specifically, the output shaft of the driving motor 321 drives the first worm 3222 to rotate, the first worm 3222 is engaged with the first worm wheel 3225, so as to drive the first worm wheel 3225 to rotate, the first worm wheel 3225 is connected with the second worm 3224, so as to drive the second worm 3224 to rotate, the second worm wheel 3224 is engaged with the second worm wheel 3226, so as to drive the second worm wheel 3226 to rotate, the second worm wheel 3226 is connected with the power output shaft 3223, so as to drive the sun wheel 3227 to rotate through the power output shaft 3223, the rotating sun wheel 3227 is engaged with the three planet wheels 3323 for transmission, the structure is compact, and the mechanical transmission efficiency is high.

As shown in fig. 4, 9 and 10, a planetary transmission portion 33 is disposed between the motor assembly 32 and the cam driving assembly 31 of the present embodiment, the planetary transmission portion 33 includes an installation base 331, a lower connection shaft sleeve 332 is sleeved in the middle of the installation base 331, the lower connection shaft sleeve 332 is connected to an upper connection shaft sleeve 3152, an upper housing 333 connected to a lower housing 3221 is disposed at the bottom of the installation base 331, the upper housing 333 is provided with a planet carrier 334, a plurality of installation holes 3321 are disposed at the bottom of the lower connection shaft sleeve 332, the installation holes 3321 are distributed in a triangular arrangement, a rotation shaft 3322 is installed in the installation holes 3321, the rotation shaft 3322 is connected to a planet wheel 3323, the sun wheel 3227 is engaged with the planet wheel 3323, and the planet wheel 3323 is engaged with the planet carrier 334. Specifically, the motor assembly 32 is in transmission connection with the cam driving assembly 31 through the planetary transmission portion 33, the driving motor 321 drives the sun gear 3227 to rotate through the gear box 322, the three planet gears 3323 are correspondingly inserted into the three mounting holes 3321 through the three rotating shafts 3322, so that the three planet gears 3323 are arranged and distributed at the bottom of the lower connecting shaft sleeve 332 in a triangular shape, on one hand, the three planet gears 3323 are meshed with the outer surface of the sun gear 3227 and rotate around the sun gear 3227, on the other hand, the three planet gears 3323 are meshed with the inner surface of the planet carrier 334 and rotate circumferentially along the planet carrier 334, so that the three planet gears 3323 are in high-efficiency transmission between the sun gear 3227 and the planet carrier 334, the structure is compact, the transmission efficiency is high, the lower connecting shaft sleeve 332 is driven to rotate by the three planet gears 3323, and because the lower connecting shaft sleeve 332 is inserted into the upper connecting shaft sleeve 3152, and then drive cam drive assembly 31 and do rotation and lift action, compact structure, the connection is stable.

As shown in fig. 1, 2 and 3, the table top movable frame 2 of the present embodiment includes a cross support frame 21, a first support plate 22 and a second support plate 23 are disposed in parallel on both sides of the cross support frame 21, a first guide rail 24 and a second guide rail 25 are respectively disposed outside the first support plate 22 and the second support plate 23, a middle portion of the cross support frame 21 is connected to a cam sleeve 311, a mounting seat 26 connected to the main table top is disposed on a top portion of the cross support frame 21, and a connecting shaft 27 is connected between the mounting seat 26 and the cross support frame 21. Specifically, a first support plate 22 and a second support plate 23 are arranged on two sides of the cross support frame 21 in parallel, a first guide rail 24 and a second guide rail 25 are respectively arranged on outer side walls of the first support plate 22 and the second support plate 23, the cam driving assembly 31 is arranged in the middle of the cross support frame 21, the assembling seat 26 is connected with the main table panel, and the assembling seat 26 is connected with the cross support frame 21 through a plurality of connecting shafts 27.

As shown in fig. 1, 2 and 3, a rotating base 28 is disposed at the bottom of the cross support frame 21 of the present embodiment, a mounting screw 29 is disposed at a connection portion between the rotating base 28 and the cam block 317, a first power arm 281 and a second power arm 282 are disposed at two sides of the rotating base 28, the first power arm 281 and the second power arm 282 are connected to a first transmission arm 283 and a second transmission arm 284, the first transmission arm 283 and the second transmission arm 284 are connected to a first telescopic frame 285 and a second telescopic frame 286, the first telescopic frame 285 is provided with a first slider 287 slidably connected to the first guide rail 24, and the second telescopic frame 286 is provided with a second slider 288 slidably connected to the second guide rail 25. Specifically, the rotating base 28 is connected with the cam block 317 through the mounting screw 29, so as to achieve assembly connection between the cross support 21 and the cam driving assembly 31, the motor assembly 32 drives the table top moving frame 2 to rotate through the cam driving assembly 31, the rotating base 28 drives the first power arm 281 and the second power arm 282 to rotate, the first power arm 281 and the second power arm 282 respectively push the first expansion bracket 285 and the second expansion bracket 286 to horizontally move through the first driving arm 283 and the second driving arm 284, the first expansion bracket 285 slides along the first guide rail 24 through the first slider 287, the second expansion bracket 286 slides along the second guide rail 25 through the second slider 288, so as to achieve the purpose of extending the table top edge outwards or accommodating the table top edge inwards of the table top moving frame 2, and the operation is continuous, and the movement is stable and rapid.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.