CN210308368U - Glaze spraying displacement rotary table and combined glaze spraying rotary table - Google Patents

Abstract

The application provides a glaze spraying revolving stage and combination formula glaze spraying revolving stage that shifts relates to body transfer device technical field. The glaze spraying displacement turntable comprises a base, a rotating frame and a positioning structure. The rotating frame can rotate relative to the base through the displacement power device. The positioning structure comprises a positioning part, a positioning hole and a driving part, the positioning part is arranged on the base, the positioning hole is arranged on the rotating frame, and the driving part can enable the positioning part to be inserted into or withdrawn from the positioning hole. The glaze spraying displacement rotary table can realize the rotary displacement and the positioning of the green body on the rotary table, has simple integral structure, and has lower cost and high practicability compared with the common technology. The combined glaze spraying rotary table can also effectively solve the prior technical problem by using the glaze spraying deflection rotary table.

Description

Glaze spraying displacement rotary table and combined glaze spraying rotary table

Technical Field

The application relates to the technical field of blank transfer devices, in particular to a glaze spraying deflection rotary table and a combined glaze spraying rotary table.

Background

The existing glazing equipment (such as 'a robot automatic sleeve-applying equipment-CN 105399451B') generally comprises a closed dust-removing room, an external shaft, an inverted roller chain conveying line, a glazing robot, a glaze slurry supply device, an image recognition device, a product transfer machine and a PLC (programmable logic controller), wherein the side roller chain conveying line and the product transfer machine can convey and transfer blanks, and the glazing robot and the glaze slurry supply device can finish automatic glaze spraying.

In the existing glazing equipment, in the process of conveying an object (blank) to be glazed into a glazing area and conveying the object out of the glazing area, a used conveying device has a complex structure and higher cost.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a glaze spraying deflection rotary table which can improve the technical problem.

Another objective of the present application is to provide a combined glaze spraying turntable, which includes the above glaze spraying displacement turntable, and can solve the problems of complex equipment structure and high cost in the green body transferring process.

The embodiment of the application is realized as follows:

an embodiment of the application provides a glaze spraying revolving stage that shifts, includes: the device comprises a base, a rotating frame and a positioning structure; the rotary frame can rotate relative to the base through a displacement power device, and is provided with a first working position for receiving the green body and a second working position for delivering the green body, the displacement power device comprises a first servo motor, a synchronous belt and a worm gear speed reducer, the first servo motor is arranged on the base, the worm gear speed reducer is arranged on the base, the output end of the first servo motor is in transmission connection with the worm gear speed reducer through the synchronous belt, and the output end of the worm gear speed reducer is in transmission connection with the rotary frame; the positioning structure is used for positioning the rotating frame at a first working position or a second working position, the positioning structure comprises a positioning piece, a positioning hole and a driving piece, the positioning piece is arranged on the base, the positioning hole is arranged in the rotating frame, the driving piece is used for driving the positioning piece to move so that the positioning piece is inserted into or withdrawn from the positioning hole, the positioning piece comprises a main body part and a guide part, the guide part is formed at one end of the main body part and faces away from the direction of the main body part, the positioning hole is matched with the main body part, and the guide part is used for guiding the main body part to be inserted into the positioning hole.

Through using first servo motor, hold-in range and worm gear speed reducer machine to form the power device that shifts to with this drive revolving rack rotation, can simplify drive arrangement's structure and reduce cost, the simple structure's that cooperation setting element, locating hole and driving piece formed location structure, make the location of revolving rack also can reach required precision requirement, and need not to be equipped with the complicated, the higher positioner of cost of structure. The problems of complex structure and high cost of the existing transfer device are integrally and effectively improved.

In addition, the glaze spraying displacement turntable provided by the embodiment of the application can also have the following additional technical characteristics:

in an alternative embodiment of the present application, the turret includes a turret body and a sleeve, the sleeve is fixed to the turret body, and the positioning hole is a central hole of the sleeve.

The positioning hole is provided by applying the simple sleeve, the cost of the part is lower, the structure is simple, and the maintenance is convenient.

In an alternative embodiment of the present application, the driving member is a positioning cylinder, and the main body portion is connected to an output end of the positioning cylinder.

The positioning cylinder has lower cost and stable working effect, and is convenient to connect with the main body part.

In an alternative embodiment of the present application, the positioning member is a guide shaft, and the inlet of the sleeve has a round chamfer.

The guide when fixing a position through the form of guiding axle, its simple structure and reliable is assisted with the round chamfer design of telescopic entrance for during the direction, the guiding axle gets into the sleeve more smoothly, can accomplish the location work well.

In an optional embodiment of the application, the middle position of the rotating frame is connected with the output end of the worm gear speed reducer, and the rotating frame comprises a plurality of bearing stations for bearing the green bodies.

By arranging the carrying stations at the two ends of the rotating frame, when one carrying station is located at the first working position, the other carrying station can be located at the second working position. When the shifting power device drives the rotating frame to transfer the green bodies, the two bearing stations can be simultaneously positioned at two working positions, so that the green bodies can be received and the other green body can be delivered, and the transfer efficiency of the green bodies is improved.

In an optional embodiment of the present application, the glaze spraying deflection turntable further includes a base shield, the base shield is connected to the rotating frame, and the base shield is covered outside the base.

Through setting up the base guard shield, can make power device and the location structure that shifts obtain certain protection, make them have longer life, reduce maintenance, change number of times, and then reduce the equipment cost in the production.

The embodiment of the application provides a modular glaze spraying revolving stage, including lift revolving stage and above-mentioned arbitrary the glaze spraying revolving stage that shifts, the glaze spraying revolving stage that shifts the revolving stage including bearing the station, bear the station including dodging the space, when bearing the station and being in second operating position, the lift revolving stage is located dodge the space below, the lift revolving stage can stretch into dodge space and jacking bear the base body on the station.

Through using foretell glaze spraying revolving stage that shifts, the whole work that the body was transferred to combination formula glaze spraying revolving stage can normally go on to holistic cost obtains corresponding reduction, and the structure is also simpler for prior art, easily overhauls the maintenance.

In the optional embodiment of this application, bear the station and include two and bear the arm, bear the station when being in the second operating position, two bear and form between the arm dodge the space, the lift revolving stage is in two on the horizontal direction bear between the arm, when lift revolving stage jacking body and rotation body, not by bear the arm and interfere.

Through the size design of the lifting rotary table, the lifting rotary table can work normally and is not influenced by the bearing arm.

In the optional embodiment of this application, the lift revolving stage includes lift supporting seat, lift seat, brace table and lift power component, lift power component includes lift cylinder, second servo motor and speed reducer, the lift cylinder set up in the lift supporting seat just with lift seat transmission is connected, second servo motor with the speed reducer all set up in the lift seat, the brace table with the speed reducer transmission is connected.

Through the lift power component who uses lift cylinder, second servo motor and speed reducer to constitute, the lift of lift seat can be realized to the structure is simple relatively, and job stabilization, and then make the lift of brace table also more steady.

In the optional embodiment of this application, the lift revolving stage still includes first protection casing, second protection casing and third protection casing, first protection casing cover is located the peripheral position of liter commentaries on classics supporting seat, the second protection casing connect in the periphery of lift seat and with first protection casing forms labyrinth, the third protection casing connect in the periphery of brace table and with the second protection casing forms labyrinth.

Through the mutual seal structure that forms of first protection casing, second protection casing and third protection casing, the lift revolving stage when the cooperation glaze spraying robot carries out the glaze spraying operation, and internals can obtain better protection, avoids during a large amount of glazes of glaze spraying in-process enters into lift power component, and the guarantee body can normally be gone up and down or rotate.

The beneficial effects of the utility model include:

the glaze spraying displacement rotary table forms a displacement power device by using the first servo motor, the synchronous belt and the worm gear speed reducer, and drives the rotary table to rotate, so that the structure of the driving device can be simplified, the cost is reduced, a positioning structure with a simple structure formed by a positioning piece, a positioning hole and a driving piece is matched, the positioning of the rotary table can meet the requirement on required precision, and the rotary table is not required to be provided with a positioning device with a complex structure and higher cost. The problems of complex structure and high cost of the existing transfer device are integrally and effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is an isometric view of a glaze spraying indexing turntable provided in embodiment 1 of the present application;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

fig. 4 is a partially enlarged view of a portion a of fig. 3;

fig. 5 is an isometric view of a combined glaze spraying turntable provided in example 2 of the present application;

FIG. 6 is an isometric view of the elevating turntable of FIG. 5;

fig. 7 is a cross-sectional view of fig. 6.

Icon: 100-glaze spraying shifting rotary table; 10-a base; 21-a turret body; 22-a sleeve; 23-a carrier station; 231-a carrying arm; 30-a positioning structure; 31-a positioning element; 312-a body portion; 314-a guide; 32-positioning holes; 33-a drive member; 41-a first servomotor; 42-a synchronous belt; 43-worm gear reducer; 50-a base shield; 1000-combined glaze spraying rotary table; 200-lifting the rotary table; 210-lifting and rotating the supporting seat; 220-a lifting seat; 230-a support table; 241-a lifting cylinder; 242-a second servomotor; 243-speed reducer; 251-a first protective cover; 252-a second shield; 253-third prevention cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is noted that the terms "first", "second", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1

Referring to fig. 1 to 3, the embodiment provides a glaze spraying shifting turntable 100, including:

a base 10;

the blank conveying device comprises a rotating frame, the rotating frame can rotate relative to a base 10 through a displacement power device, and the rotating frame is provided with a first working position for receiving a blank and a second working position for delivering the blank, the displacement power device comprises a first servo motor 41, a synchronous belt 42 and a worm and gear speed reducer 43 (shown in figure 2), the first servo motor 41 is arranged on the base 10, the worm and gear speed reducer 43 is arranged on the base 10, the output end of the first servo motor 41 is in transmission connection with the worm and gear speed reducer 43 through the synchronous belt 42, and the output end of the worm and gear speed reducer 43 is in transmission connection with the rotating frame;

the positioning structure 30, the positioning structure 30 is used for positioning the rotating rack at the first working position or the second working position, the positioning structure 30 includes a positioning member 31, a positioning hole 32 and a driving member 33 (as shown in fig. 3), the positioning member 31 is disposed on the base 10, the positioning hole 32 is disposed on the rotating rack, the driving member 33 is used for driving the positioning member 31 to move so as to insert or withdraw the positioning member 31 into or from the positioning hole 32, the positioning member 31 includes a main body portion 312 and a guiding portion 314, the guiding portion 314 is formed at one end of the main body portion 312 and is tapered towards a direction away from the main body portion 312, the positioning hole 32 is adapted to the main body portion 312, and.

It should be noted that, in fig. 2, the outer base shield 50 is partially removed for illustrating the shifting power device, but it should be understood that, in the normal state, the base shield 50 is completely covered in the circumferential direction of the base 10 without a large area of vacancy.

The turntable that shifts usually adopts cam divider structure and accurate speed reducer structure, and its structure is complicated, and when its repeated positioning accuracy that shifts does not reach the standard, need carry out the whole change of part level to holistic cam divider structure and accurate speed reducer structure usually, and need the producer professional engineer to maintain. These complicated and precise structures are not convenient for daily maintenance, but also have higher purchase cost, and the cost generated when the maintenance and replacement conditions are met is not very high. This application forms the power device that shifts through using first servo motor 41, hold-in range 42 and worm gear speed reducer 43 to with this drive revolving rack rotation, can simplify drive arrangement's structure and reduce cost, the simple structure's that cooperation setting element 31, locating hole 32 and driving piece 33 formed location structure 30 for the location of revolving rack also can reach required precision, and need not to be equipped with the complicated, the higher positioner of cost of structure. The problems of complex structure and high cost of the existing transfer device are integrally and effectively improved.

Specifically, in the present embodiment, the turret includes a turret body 21 and a sleeve 22, the sleeve 22 is fixed to the turret body 21, and the positioning hole 32 is a central hole of the sleeve 22. By using a simple sleeve 22 to provide the locating hole 32, the cost of the components is low, and the structure is simple and easy to maintain. The positioning member 31 is a guide shaft, and the inlet of the sleeve 22 has a rounded chamfer (see fig. 4). The guide when fixing a position through the form of guiding axle, its simple structure and reliable is assisted with the round chamfer design of sleeve 22's entrance for during the direction, the guiding axle gets into sleeve 22 more smoothly, can accomplish the location work well.

Furthermore, the middle position of the rotating frame is connected with the output end of the worm gear speed reducer 43, and the rotating frame comprises a plurality of bearing stations 23 for bearing the green bodies. In the present embodiment, the number of the carrying stations is two, and each carrying station 23 includes two carrying arms 231. By arranging the carrier stations 23 at both ends of the turret, one carrier station 23 will be in the first working position and the other carrier station 23 will be in the second working position. When the shifting power device drives the rotating frame to transfer the green bodies, the two bearing stations 23 can be simultaneously positioned at two working positions, so that the green bodies can be received and the other green body can be delivered, and the transfer efficiency of the green bodies is improved.

Because there are two carrying stations 23, in order to position the two carrying stations 23 normally, two sleeves 22 symmetrical in the direction of 180 ° of the rotating frame are provided on the rotating frame in this embodiment. In detail, for the convenience of description, the two carrying stations 23 are respectively named as a first station and a second station, and when the first station is in the first working position, the second station is in the second working position, and at this time, the guide shaft can be kept inserted into one of the sleeves 22, so that the first station can receive the green body to be sprayed with glaze. After the receiving is finished, the guide shaft is separated from the sleeve 22 under the driving of the driving piece 33, and the rotating frame rotates under the driving of the displacement power device, so that the first station rotates to the second working position, and the second station rotates to the first working position. The drive member 33 then drives the guide shaft up again and inserts the other sleeve 22 so that the station one and station two holding positions are unchanged. It will be appreciated that when there are a plurality of carrier stations, for example three, four, etc., each carrier station has a sleeve 22 associated therewith to effect positioning.

The driving member 33 used in this embodiment is a positioning cylinder, and the main body 312 is connected to an output end of the positioning cylinder. The positioning cylinder has lower cost and stable working effect, and is convenient to be connected with the main body part 312. In addition to the air cylinder, it is conceivable that devices such as oil cylinders, electric cylinders, etc., which can be used for linear drive, can also be used for driving the guide shaft.

By alternately positioning the first station and the second station, the green bodies can be received and delivered more efficiently, and the processing efficiency is improved.

It is envisaged that there may be a plurality of sleeves 22, the arrangement of the plurality of sleeves 22 on the turret body 21 being in a circumferential array, such that the loading stations 23 may be positioned at different angles to accommodate non-symmetrical positions of the first working position for receiving blanks and the second working position for delivering blanks.

It is envisaged that where there is only one carrier station 23, the number and arrangement of the sleeves 22 may be the same as described above.

Optionally, the glaze spraying displacement turntable 100 further comprises a base shield 50, the base shield 50 is connected to the rotating stand, and the base shield 50 covers the outside of the base 10. By arranging the base shield 50, the power device and the positioning structure 30 which are displaced can be protected to a certain extent, so that the power device and the positioning structure have longer service life, the maintenance and replacement times are reduced, and the equipment cost in production is further reduced.

Example 2

Referring to fig. 5 to 7, the present embodiment provides a combined glaze spraying turntable 1000, including a lifting turntable 200 and the glaze spraying displacement turntable 100 in embodiment 1, where a rotating frame of the glaze spraying displacement turntable 100 includes a bearing station 23, the bearing station 23 includes an avoidance space, and when the bearing station 23 is at the second working position, the lifting turntable 200 is located below the avoidance space, and the lifting turntable 200 can extend into the avoidance space and lift up a green body on the bearing station 23.

Here, the structure of the glaze spraying displacement turntable 100 can be understood in conjunction with fig. 1 to 4 in embodiment 1.

By using the glaze spraying displacement turntable 100, the whole work of transferring the green body by the combined glaze spraying turntable 1000 can be normally carried out, the whole cost is correspondingly reduced, and the structure is simpler compared with the prior art and is easy to overhaul and maintain. The bearing station comprises two bearing arms 231, when the bearing station 23 is located at the second working position, an avoiding space is formed between the two bearing arms 231, the lifting rotary table 200 is located between the two bearing arms 231 in the horizontal direction, and when the lifting rotary table 200 jacks up the blank and rotates the blank, the blank is not interfered by the bearing arms 231. That is, the lift support base 210, the lift base 220, the support base 230 and the lift power assembly are all horizontally disposed between the two support arms 231. The diameter of the circular support platform 230 is smaller than the gap between the two support arms 231, and after the support platform 230 is lifted, the height of the bottom of the support platform is higher than the height of the top surface of the support arms 231. The three support bars on the support platform 230 in fig. 6 are parallel to the bearing arm during the lifting or lowering process, so that the blank is lifted by the lifting turntable 200 and the blank is rotated without interference of the bearing arm 231. This application is through the size design to the lift revolving stage for the lift revolving stage can normally work, does not receive the influence of bearing the arm.

It is contemplated that the bearing arms 231 may not be a completely straight arm structure, but only that a gap of two bearing arms 231 is ensured sufficient to accommodate the lifting turntable 200 in a horizontal direction. Alternatively, the support station 23 may not include arm structures, but rather a plate structure with openings sufficient to accommodate the support table 230 and the support bars therethrough.

Specifically, referring to fig. 7, in the present embodiment, the lifting turntable 200 includes a lifting support base 210, a lifting base 220, a support base 230 and a lifting power assembly, the lifting power assembly includes a lifting cylinder 241, a second servo motor 242 and a speed reducer 243, the lifting cylinder 241 is disposed on the lifting support base 210 and is in transmission connection with the lifting base 220, the second servo motor 242 is in transmission connection with the speed reducer 243, both the second servo motor 242 and the speed reducer 243 are disposed on the lifting base 220, and the support base 230 is in transmission connection with the speed reducer 243. Through the lifting power assembly formed by the lifting cylinder 241, the second servo motor 242 and the reducer 243, the lifting of the lifting seat 220 can be realized, the structure is relatively simple, the work is stable, and the lifting of the support platform 230 is more stable.

Further, considering that the lifting turntable 200 is also sprayed with glaze in a glaze spraying environment, the lifting turntable 200 of the present embodiment further includes a first protection cover 251, a second protection cover 252 and a third protection cover 253, the first protection cover 251 is covered on the outer periphery of the lifting support base 210, the second protection cover 252 is connected to the outer periphery of the lifting support base 220 and forms a labyrinth with the first protection cover 251, and the third protection cover 253 is connected to the outer periphery of the support base 230 and forms a labyrinth with the second protection cover 252. Through the mutual seal structure that forms of first protection casing 251, second protection casing 252 and third protection casing 253, when lifting turntable 200 carries out the glaze spraying operation in cooperation glaze spraying robot, the internals can obtain better protection, avoids a large amount of glazes of glaze spraying in-process to enter into the power component that goes up and down, and the guarantee body can normally be gone up and down or rotate.

The combined glaze spraying rotary table 1000 of the embodiment can realize the in-and-out displacement transportation of the blank only by the cooperation of the lifting rotary table 200 and the glaze spraying displacement rotary table 100 in the embodiment 1, and can complete the glaze spraying work of the product by cooperating with a glaze spraying robot. Compared with the common technology, the whole structure is simpler, the cost is lower, the later maintenance cost is lower, and the existing technical problems are effectively improved.

To sum up, the glaze spraying displacement turntable 100 of the present application can realize the rotation displacement of the green body on the rotating frame through the speed reduction and reinforcement of the first servo motor 41, the synchronous belt 42 and the worm gear reducer 43. And realize the flexible of guiding axle through the location cylinder for the guiding axle can insert or deviate from sleeve 22, makes the revolving rack can be pinpointed or can be driven rotatory, and overall structure is simple, and the cost is cheaper than general technique, and is very practical. The combined glaze spraying rotary table 1000 can also effectively solve the existing technical problems by using the glaze spraying displacement rotary table 100.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A glaze spraying shift rotary table is characterized by comprising:

a base;

the rotary frame can rotate relative to the base through a displacement power device, and is provided with a first working position for receiving the green body and a second working position for delivering the green body;

the positioning structure is used for positioning the rotating frame at a first working position or a second working position, the positioning structure comprises a positioning piece, a positioning hole and a driving piece, the positioning piece is arranged on the base, the positioning hole is arranged in the rotating frame, the driving piece is used for driving the positioning piece to move so that the positioning piece is inserted into or withdrawn from the positioning hole, the positioning piece comprises a main body part and a guide part, the guide part is formed at one end of the main body part and towards the direction reducing of the main body part, the positioning hole is matched with the main body part, and the guide part is used for guiding the main body part to be inserted into the positioning hole.

2. The glaze spraying indexing turntable of claim 1, wherein the rotating stand comprises a rotating stand body and a sleeve, the sleeve is fixed on the rotating stand body, and the positioning hole is a central hole of the sleeve.

3. The glaze spraying shifting rotary table according to claim 2, wherein the driving member is a positioning cylinder, and the main body part is connected with an output end of the positioning cylinder.

4. The glaze spraying shifting rotary table according to claim 2, wherein the positioning member is a guide shaft, and the inlet of the sleeve has a round chamfer.

5. The glaze spraying shifting rotary table according to claim 1, wherein the middle position of the rotary table is connected with the output end of the worm gear reducer, and the rotary table comprises a plurality of bearing stations for bearing the green bodies.

6. The glaze spraying shifting rotary table according to claim 1, further comprising a base shield, wherein the base shield is connected with the rotary frame, and the base shield is covered outside the base.

7. A combined glaze spraying rotary table is characterized by comprising a lifting rotary table and the glaze spraying shifting rotary table according to any one of claims 1 to 6, wherein the rotary frame of the glaze spraying shifting rotary table comprises a bearing station, the bearing station comprises an avoiding space, when the bearing station is located at a second working position, the lifting rotary table is located below the avoiding space, and the lifting rotary table can stretch into the avoiding space and lift up a green body on the bearing station.

8. The combined glaze spraying rotary table of claim 7, wherein the carrying station includes two carrying arms, the carrying arm forms the avoiding space therebetween when the carrying station is in the second working position, the lifting rotary table is horizontally disposed between the two carrying arms, and the lifting rotary table is not interfered by the carrying arms when the lifting rotary table lifts and rotates the green body.

9. The combined glaze spraying rotary table of claim 7, wherein the lifting rotary table comprises a lifting support base, a lifting base, a support base and a lifting power assembly, the lifting power assembly comprises a lifting cylinder, a second servo motor and a speed reducer, the lifting cylinder is arranged on the lifting support base and is in transmission connection with the lifting base, the second servo motor is in transmission connection with the speed reducer, the second servo motor and the speed reducer are both arranged on the lifting base, and the support base is in transmission connection with the speed reducer.

10. The combined type glaze spraying rotary table of claim 9, wherein the lifting rotary table further comprises a first protection cover, a second protection cover and a third protection cover, the first protection cover is disposed at a position of the periphery of the lifting support base, the second protection cover is connected to the periphery of the lifting support base and forms a labyrinth seal with the first protection cover, and the third protection cover is connected to the periphery of the support base and forms a labyrinth seal with the second protection cover.

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