CN111318970B

CN111318970B - Novel plastics case surface dull polish of additive preparation device

Info

Publication number: CN111318970B
Application number: CN202010354467.1A
Authority: CN
Inventors: 林媚媚
Original assignee: Yuanlu New Material Technology Jiangsu Co Ltd
Current assignee: Yuanlu new material technology (Jiangsu) Co., Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-11-13
Anticipated expiration: 2040-04-29
Also published as: CN111318970A

Abstract

The invention discloses a novel plastic box surface grinding device prepared by additives, which comprises a base, wherein a rotating disc is rotatably arranged on the top surface of the base, four article placing cavities arranged in an annular array are formed in the rotating disc, the article placing cavities vertically penetrate through the rotating disc, the diameter of an upper opening of each article placing cavity is larger than that of a lower opening of each article placing cavity, plastic boxes are placed in the article placing cavities, and a support is fixedly arranged on the top surface of the base.

Description

Novel plastics case surface dull polish of additive preparation device

Technical Field

The invention relates to the technical field of surface treatment, in particular to a plastic box surface grinding device prepared from a novel additive.

Background

Along with the continuous improvement of social standard of living, people's use more and more to plastic products, traditional plastic material is also replaced by novel plastics gradually, there are many plastics that prepare through novel additive in the life, these plastic products generally can carry out dull polish processing with its surface for pleasing to the eye or other reasons between the use, traditional dull polish device generally is with plastic products, put it neatly through the manual work, then hold through anchor clamps, place it in a space again, then use sand blaster, dull polish processing, it is more time-consuming and laboursome to use the manual work, and the recovery of grit is more troublesome, therefore it is necessary to design a dull polish device that can retrieve the grit automatically, and can automatic feeding.

Disclosure of Invention

The invention aims to provide a novel plastic box surface sanding device prepared from an additive, which is used for overcoming the defects in the prior art.

The plastic box surface grinding device prepared from the novel additive comprises a base, wherein a rotating disc is rotatably arranged on the top surface of the base, four storage cavities arranged in an annular array are formed in the rotating disc, the storage cavities vertically penetrate through the rotating disc, the diameter of an upper opening of each storage cavity is larger than that of a lower opening of each storage cavity, plastic boxes are stored in the storage cavities, a support column is fixedly arranged on the top surface of the base, a cross beam is fixedly arranged at the top end of each support column, a lifting plate capable of moving up and down is arranged at the bottom of each cross beam, a fixed block is fixedly arranged on the bottom surface of each lifting plate, a cylindrical cover is fixedly arranged on the bottom surface of each fixed block and used for covering the plastic boxes in the storage cavities and sealing the top parts of the storage cavities, a vertically extending spline shaft is rotatably arranged in each lifting plate, and the top ends of the spline shafts are rotatably matched with the cross, the bottom surface of the lifting plate is rotatably provided with a spline sleeve, the spline sleeve is positioned on the right side of the fixed block and is connected with the spline shaft in a matched manner, the bottom of the spline sleeve is fixedly provided with a rotating plate, the bottom of the rotating plate is provided with a clamping plate for clamping a plastic box, the right side of the base is rotatably provided with a transmission belt wheel, the periphery of the transmission belt wheel is wound with a transmission belt, the transmission belt is used for conveying the plastic box, a gravel cavity is formed in the base, the top wall of the gravel cavity is provided with a material return opening, the material return opening can communicate the leftmost placing cavity with the gravel cavity, so that gravel sprayed out of the cylinder cover can enter the gravel cavity through the material return opening, a screw rod is rotatably arranged in the gravel cavity and is used for preventing the gravel from being stacked on the right half part in the gravel cavity, and the rotation of the transmission belt wheel and the rotation of the screw, the rotation of the spline shaft and the rotation of the rotating disc are both driven by a rotating motor.

Further technical scheme, it switches the chamber to have seted up in the base, it is equipped with the switching slider to switch the intracavity slip, the rotating electrical machines sets firmly in the switching slider, the equal power connection in both ends has outer tooth piece about the rotating electrical machines, it is equipped with the cross axle all to rotate on the wall body of the left and right sides in chamber to switch, two the cross axle is close to each other one side end all sets firmly interior tooth piece, outer tooth piece can insert in the interior tooth piece, and then drive the interior tooth piece rotates, two one side end that the cross axle kept away from each other all sets firmly power bevel gear, the electromagnet mechanism has set firmly on the right wall in chamber switches, switch the slider with it has the spring to install the spring between the left side wall body in chamber to switch.

In a further technical scheme, the main motor is positioned at the lower side of the gravel cavity, the right end of the main motor is connected with a power belt wheel in a power mode, a driven belt wheel is fixedly arranged on the periphery of the right extending part of the screw rod, the driven belt wheel is connected with the power belt wheel through a transmission belt, a first bevel gear is fixedly arranged at the right end of the screw rod, a second bevel gear is arranged at the rear side of the first bevel gear in a meshing and rotating manner, the second bevel gear is in power connection with the rear end of the transmission belt wheel through a belt, the power belt wheel can drive the screw rod to rotate through the work of the main motor, thereby allowing gravel to be transported from the right part of the gravel cavity to the left side of the gravel cavity, preventing packing, and the second bevel gear can drive the transmission belt wheel to rotate, so that the plastic box is conveyed leftwards by the conveying belt.

According to the technical scheme, a rotating shaft is fixedly arranged on the bottom surface of the rotating disc, a driven bevel gear is fixedly arranged at the bottom end of the rotating shaft and meshed with the power bevel gear on the left side, and a rotating bevel gear is fixedly arranged at the bottom end of the spline shaft and meshed with the power bevel gear on the right side.

A further technical scheme, the sandblaster has set firmly on the top surface of crossbeam, the left side intercommunication of sandblaster is equipped with violently the pipe, be equipped with the standpipe that upwards extends in the grit chamber, the standpipe with violently manage between through the hose intercommunication, the lower extreme of sandblaster has set firmly the abrasive tube, the slide pipe has set firmly on the lifter plate, the top part of slide pipe inserts in the abrasive tube, and with the abrasive tube slides the intercommunication, the bottom of slide pipe with the sandblaster intercommunication, through the work of sandblaster can make the grit of grit intracavity gets into in the cylinder cover to make the grit polish the surface of plastic box, the grit can get back to by the feed back mouth again simultaneously the grit intracavity.

According to the technical scheme, two bilaterally symmetrical slide guiding barrels are fixedly arranged on the cross beam, two bilaterally symmetrical slide guiding columns are fixedly arranged on the top surface of the lifting plate and are inserted into the slide guiding barrels and are connected with the slide guiding barrels in a sliding fit mode, a lifting motor is fixedly arranged on the top surface of the cross beam, a lifting wheel is dynamically connected to the right end of the lifting motor, a pull wire is wound on the lifting wheel, the bottom end of the pull wire is fixed with the top surface of the lifting plate, and the lifting wheel pulls the pull wire through the working of the lifting motor, so that the lifting plate can slide up and down

According to the technical scheme, a sliding groove is formed in the bottom surface of the rotating plate, two thread blocks which are bilaterally symmetrical are arranged in the sliding groove in a sliding mode, a clamping motor is fixedly embedded in the right side end wall of the sliding groove, the left end of the clamping motor is in power connection with a screw shaft, the thread rotating directions of the left part and the right part of the screw shaft are opposite, the screw shaft is in threaded fit connection with the thread blocks, two fixing rods which are bilaterally symmetrical are fixedly arranged on the bottom surface of the rotating plate, clamping rods are hinged to the lower ends of the fixing rods, the clamping plates are fixed to the corresponding clamping rods, and the clamping rods are hinged to the corresponding thread blocks through linkage rods.

The invention has the beneficial effects that: the gravel of the invention can fall back into the gravel cavity again through the feed back hole to finish the automatic collection operation of the gravel, thereby saving the step of manual recovery, in addition, the feeding of the invention is realized by automatically clamping the clamping plate and matching with the rotation of the rotating plate, so that the plastic box can fall into the storage cavity on the rotating plate, then the next material is fed by the automatic rotation of the rotating disc, thereby achieving the purpose of automatic feeding, greatly saving labor and time, and after one plastic box is ground, the automatic grinding device can automatically perform the grinding operation of the next plastic box through the automatic rotation of the rotating disc, does not need manpower to switch completely, greatly improves the automation degree of equipment, is very suitable for production line operation, shortens the time, improves the efficiency, and is relatively simple in structure, very convenient to operate and convenient to popularize and use.

Drawings

FIG. 1 is a schematic view of the internal structure of a plastic box surface sanding device made with the novel additive of the present invention;

FIG. 2 is an enlarged schematic view of the present invention at the rotating plate;

FIG. 3 is an enlarged partial schematic view of A of FIG. 1 in accordance with the present invention;

fig. 4 is a partially enlarged view of B of fig. 1 according to the present invention.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent, the following detailed description of the invention, taken in conjunction with the examples, should be understood that the following text is only intended to describe one or more specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, and as used herein, the terms up, down, left, and right are not limited to their strict geometric definitions, but rather include tolerances for reasonable and inconsistent machining or human error, the following detailed description of the specific features of the plastic box surface sanding device made with the novel additive:

referring to fig. 1 to 4, the plastic box surface grinding device for preparing a novel additive according to the embodiment of the present invention includes a base 10, a rotating disk 35 is rotatably disposed on the top surface of the base 10, four object placing cavities 29 arranged in an annular array are disposed on the rotating disk 35, the object placing cavities 29 vertically penetrate through the rotating disk 35, the diameter of the upper opening of the object placing cavities 29 is larger than the diameter of the lower opening, the plastic box 30 is disposed in the object placing cavities 29, a support column 20 is fixedly disposed on the top surface of the base 10, a cross beam 25 is fixedly disposed at the top end of the support column 20, a lifting plate 21 capable of moving up and down is disposed at the bottom of the cross beam 25, a fixing block 28 is fixedly disposed on the bottom surface of the lifting plate 21, a cylindrical cover 27 is fixedly disposed on the bottom surface of the fixing block 28, the cylindrical cover 27 is used for covering the plastic box 30 in the object placing cavities 29 and sealing the top of the object, the utility model discloses a gravel box, including lifter plate 21, integral key shaft 26, crossbeam 25 running fit, spline shaft 26, spline housing 32, fixed block 28, spline housing 32's bottom has set firmly rotor plate 31, rotor plate 31's bottom is equipped with the splint 43 that is used for centre gripping plastic box 30, the right side of base 10 rotates and is equipped with driving pulley 33, the winding has conveyer belt 34 in driving pulley 33's the periphery, conveyer belt 34 is used for transporting plastic box 30, grit chamber 12 has been seted up in the base 10, feed back mouth 13 has been seted up on the roof of grit chamber 12, feed back mouth 13 can communicate leftmost put thing chamber 29 with grit chamber 12, makes the grit of cover 27 spun can get into grit chamber 12 through feed back mouth 13, the internal rotation of grit chamber 12 is equipped with hob 11, hob 11 is used for preventing the grit from piling up the right half in grit chamber 12, the rotation of driving pulley 33 with the rotation of hob 11 is driven by main motor 44, the rotation of integral key shaft 26, with the rotation of rotary disk 35 is driven by rotating electrical machines 60.

Beneficially or exemplarily, a switching cavity 57 is formed in the base 10, a switching slider 58 is slidably disposed in the switching cavity 57, the rotating motor 60 is fixedly disposed in the switching slider 58, outer toothed blocks 55 are respectively and dynamically connected to left and right ends of the rotating motor 60, lateral shafts 54 are respectively and rotatably disposed on left and right side walls of the switching cavity 57, inner toothed blocks 53 are respectively and fixedly disposed at ends of two lateral shafts 54 close to each other, the outer toothed blocks 55 can be inserted into the inner toothed blocks 53 to further drive the inner toothed blocks 53 to rotate, power bevel gears 51 are respectively and fixedly disposed at ends of two lateral shafts 54 far from each other, an electromagnet mechanism 59 is fixedly disposed on a right wall of the switching cavity 57, a spring 56 having a spring 56 is disposed between the switching slider 58 and a left side wall of the switching cavity 57, and the switching slider 58 can be pushed leftward by operation of the electromagnet mechanism 59, the left outer block 55 is engaged with the left inner block 53.

Advantageously or exemplarily, the main motor 44 is located at the lower side of the gravel cavity 12, a power pulley 45 is power-connected to the right end of the main motor 44, a driven pulley 47 is fixedly arranged on the outer periphery of the right-side extension of the screw rod 11, the driven pulley 47 is connected with the power pulley 45 through a transmission belt 46, a first bevel gear 48 is fixedly arranged at the right end of the screw rod 11, a second bevel gear 49 is arranged on the rear side of the first bevel gear 48 in a meshing rotation manner, the second bevel gear 49 is power-connected with the rear end of the transmission pulley 33 through a belt, the power pulley 45 can be driven to rotate the screw rod 11 by the operation of the main motor 44, gravel can be conveyed to the left side of the gravel cavity 12 from the right part in the gravel cavity 12, accumulation is prevented, and the transmission pulley 33 can be driven to rotate by the second bevel gear 49, thereby causing the conveyor 34 to carry the plastic box 30 to the left.

Advantageously or exemplarily, a rotating shaft 52 is fixedly arranged on the bottom surface of the rotating disc 35, a driven bevel gear 50 is fixedly arranged at the bottom end of the rotating shaft 52, the driven bevel gear 50 is engaged with the power bevel gear 51 on the left side, and a rotating bevel gear 62 is fixedly arranged at the bottom end of the spline shaft 26, and the rotating bevel gear 62 is engaged with the power bevel gear 51 on the right side.

Beneficially or exemplarily, a sand blower 17 is fixedly arranged on the top surface of the cross beam 25, a horizontal pipe 16 is arranged in the left communication of the sand blower 17, a vertical pipe 14 extending upwards is arranged in the sand chamber 12, the vertical pipe 14 is communicated with the horizontal pipe 16 through a hose 15, a sand blasting pipe 18 is fixedly arranged at the lower end of the sand blower 17, a sliding pipe 19 is fixedly arranged on the lifting plate 21, the top part of the sliding pipe 19 is inserted into the sand blasting pipe 18 and is in sliding communication with the sand blasting pipe 18, the bottom end of the sliding pipe 19 is communicated with the sand blower 17, and through the operation of the sand blower 17, the sand in the sand chamber 12 can enter the cylinder cover 27 and can be ground on the outer surface of the plastic box 30, and meanwhile, the sand can be returned to the sand chamber 12 through a material return port 13.

Beneficially or exemplarily, two bilaterally symmetrical slide guiding barrels 24 are fixedly arranged on the cross beam 25, two bilaterally symmetrical slide guiding posts 23 are fixedly arranged on the top surface of the lifting plate 21, the slide guiding posts 23 are inserted into the slide guiding barrels 24 and are in sliding fit connection with the slide guiding barrels, a lifting motor 70 is fixedly arranged on the top surface of the cross beam 25, a lifting wheel 71 is dynamically connected to the right end of the lifting motor 70, a pulling wire 22 is wound on the lifting wheel 71, the bottom end of the pulling wire 22 is fixed to the top surface of the lifting plate 21, and the lifting wheel 71 pulls the pulling wire 22 through the operation of the lifting motor 70, so that the lifting plate 21 can slide up and down

Beneficially or exemplarily, a sliding groove 38 is formed in the bottom surface of the rotating plate 31, two bilaterally symmetrical screw blocks 36 are slidably disposed in the sliding groove 38, a clamping motor 39 is fixedly embedded in the right side end wall of the sliding groove 38, a screw shaft 37 is dynamically connected to the left end of the clamping motor 39, the screw directions of the left and right portions of the screw shaft 37 are opposite, the screw shaft 37 is in threaded fit connection with the screw blocks 36, two bilaterally symmetrical fixing rods 40 are fixedly disposed on the bottom surface of the rotating plate 31, the lower ends of the fixing rods 40 are respectively hinged with a clamping rod 41, the clamping plate 43 is fixed to the corresponding clamping rod 41, the two clamping rods 41 are hinged to the corresponding screw blocks 36 through a linkage rod 42, and the clamping motor 39 operates to enable the clamping plate 43 to clamp the plastic box 30.

In the initial state, the lifting plate 21 is in the most upward state, the switching slider 58 is in the most rightward state, the right outer tooth 55 meshes with the right inner tooth 53, and the clamp plate 43 on the rotating plate 31 is positioned on the right side of the spline shaft 26.

When the plastic box is used, firstly, the main motor 44 is controlled to work, the power belt pulley 45 drives the driven belt pulley 47 to rotate, the screw rod 11 drives the first bevel gear 48 to rotate, the second bevel gear 49 drives the driving belt pulley 33 to rotate, the conveying belt 34 conveys the plastic box 30, then the lifting motor 70 is controlled to work, the lifting wheel 71 is rotated, the lifting plate 21 moves downwards, the clamping motor 39 is controlled to work, the screw shaft 37 drives the two threaded blocks 36 to approach each other, the clamping plate 43 clamps the plastic box 30, then the rotating motor 60 is controlled to work, the outer toothed block 55 drives the inner toothed block 53 on the right side to rotate, the rotating bevel gear 62 drives the spline shaft 26 to rotate, the spline shaft 26 drives the spline sleeve 32 to rotate, the rotating plate 31 is rotated, the plastic box 30 clamped by the clamping plate 43 is positioned on the storage cavity 29 on the right side, and then the clamping motor 39 is controlled to rotate reversely, the two screw blocks 36 are separated from each other, the clamping plate 43 is loosened, the plastic box 30 is placed on the placing cavity 29, the lifting motor 70 is controlled to work, the lifting plate 21 is moved upwards, then the rotating motor 60 is controlled to rotate reversely, the spline shaft 26 drives the rotating plate 31 to swing to an initial state, the second plastic box 30 is ready to be clamped, at this time, the electromagnet mechanism 59 is controlled to work, the switching slider 58 is pushed leftwards, the left outer tooth block 55 is meshed with the left inner tooth block 53, at this time, the rotating motor 60 is controlled to work, the left transverse shaft 54 is driven to rotate, the left power bevel gear 51 drives the driven bevel gear 50 to rotate, the rotating shaft 52 is driven to rotate, the rotating disk 35 is rotated ninety degrees, the next placing cavity 29 is rotated to the leftmost side, the next clamping operation is ready to be carried out, then the electromagnet mechanism 59 is controlled to be deenergized, the switching slider 58 is returned to the initial state to perform the next clamping and feeding operation;

after the loading is finished, the lifting plate 21 is controlled to move downwards, the cylinder cover 27 is covered on the plastic box 30 on the left side, then the sand blaster 17 is controlled to work, the gravel in the gravel cavity 12 is sprayed to the plastic box 30 to perform the sanding operation, then the lifting plate 21 is moved upwards, the rotating disc 35 is rotated, the plastic box 30 on the next storage cavity 29 is rotated to the left side, and then the cylinder cover 27 is covered to perform the sanding operation on the next side.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Claims

1. The utility model provides a plastics case surface dull polish of novel additive preparation device, includes the base, its characterized in that: the top surface of the base is rotatably provided with a rotating disk, the rotating disk is provided with four storage cavities arranged in an annular array, the storage cavities vertically penetrate through the rotating disk, the diameter of an opening at the upper side of each storage cavity is larger than that of an opening at the lower side of each storage cavity, the storage cavities are used for containing plastic boxes, a support column is fixedly arranged on the top surface of the base, a cross beam is fixedly arranged at the top end of each support column, the bottom of each cross beam is provided with a lifting plate capable of moving up and down, a fixed block is fixedly arranged on the bottom surface of each lifting plate, a cylindrical cover is fixedly arranged on the bottom surface of each fixed block and used for covering the plastic boxes in the storage cavities and sealing the top of the storage cavities, a spline shaft extending up and down is rotatably arranged in each lifting plate, the top end of the spline shaft is rotatably matched with the cross beams, a spline sleeve is rotatably arranged on the, the spline housing is in spline fit connection with the spline shaft, a rotating plate is fixedly arranged at the bottom end of the spline housing, the bottom of the rotating plate is provided with a clamping plate for clamping a plastic box, the right side of the base is rotatably provided with a driving belt wheel, a conveyor belt is wound on the periphery of the transmission belt wheel and used for conveying the plastic box, a gravel cavity is formed in the base, a feed back port is formed in the top wall of the gravel cavity and can communicate the leftmost accommodating cavity with the gravel cavity, so that gravel sprayed out of the cylinder cover can enter the gravel cavity through the feed back port, the screw rod is arranged in the gravel cavity in a rotating way and is used for preventing gravel from being accumulated on the right half part in the gravel cavity, the rotation of the transmission belt wheel and the rotation of the spiral rod are both driven by a main motor, and the rotation of the spline shaft and the rotation of the rotating disc are both driven by a rotating motor.

2. A novel additive-made plastic box surface sanding device as defined in claim 1, wherein: it switches the chamber to have seted up in the base, it is equipped with the switching slider to switch the intracavity slip, the rotating electrical machines sets firmly in the switching slider, the equal power connection in both ends has outer tooth piece about the rotating electrical machines, it is equipped with the cross axle all to rotate on the left and right sides wall body in chamber to switch, two one side end that the cross axle is close to each other all has set firmly interior tooth piece, outer tooth piece can insert in the internal tooth piece, and then drive the internal tooth piece rotates, two one side end that the cross axle kept away from each other all has set firmly power bevel gear, the electromagnet mechanism has set firmly on the right wall in chamber switches, switch the slider with install the spring between the left side wall body in chamber.

3. A novel additive-made plastic box surface sanding device as defined in claim 2, wherein: the utility model discloses a plastic box, including screw rod, main motor, driven pulley, power belt pulley, screw rod, power belt pulley, first bevel gear's rear side meshing rotation is equipped with second bevel gear, second bevel gear with the rear end of power belt pulley is connected through belt power, through the work of main motor can make power belt pulley beats the screw rod rotates, and then makes the gravel can by the right part in the gravel intracavity is transported the left side in gravel chamber prevents to pile up, and can pass through second bevel gear drives the power belt pulley rotates, and then makes the conveyer belt transports the plastic box left.

4. A novel additive-made plastic box surface sanding device as defined in claim 3 wherein: the bottom surface of the rotating disc is fixedly provided with a rotating shaft, the bottom end of the rotating shaft is fixedly provided with a driven bevel gear, the driven bevel gear is meshed with the power bevel gear on the left side, the bottom end of the spline shaft is fixedly provided with a rotating bevel gear, and the rotating bevel gear is meshed with the power bevel gear on the right side.

5. A novel additive-made plastic box surface sanding device as defined in claim 4 wherein: the utility model discloses a sand blasting machine, including crossbeam, riser, spout pipe, riser cover, sand blasting machine's left side intercommunication is equipped with violently the pipe, be equipped with the standpipe that upwards extends in the grit chamber, the standpipe with through the hose intercommunication between violently the pipe, the lower extreme of sand blasting machine has set firmly the blowing pipe, the slide pipe has set firmly on the lifter plate, the top part of slide pipe inserts in the blowing pipe, and with the blowing pipe slides the intercommunication, the bottom of slide pipe with the sand blasting machine intercommunication, through the work of sand blasting machine can make the grit in the grit chamber gets into in the cylinder cover to make the grit polish the surface of plastic box, the grit can get back to by the feed back again simultaneously the grit.

6. A novel additive-made plastic box surface sanding device as defined in claim 5 wherein: the lifting device is characterized in that two bilaterally symmetrical guide sliding cylinders are fixedly arranged on the cross beam, two bilaterally symmetrical guide sliding columns are fixedly arranged on the top surface of the lifting plate and are inserted into the guide sliding cylinders and are connected with the guide sliding cylinders in a sliding fit mode, a lifting motor is fixedly arranged on the top surface of the cross beam, the right end of the lifting motor is dynamically connected with a lifting wheel, a pull wire is wound on the lifting wheel, the bottom end of the pull wire is fixed with the top surface of the lifting plate, and the lifting wheel pulls the pull wire through the work of the lifting motor, so that the lifting plate can slide up and down.

7. A novel additive-made plastic box surface sanding device as defined in claim 6 wherein: the improved structure of the screw comprises a rotating plate and is characterized in that a sliding groove is formed in the bottom surface of the rotating plate, two thread blocks which are bilaterally symmetrical are arranged in the sliding groove in a sliding mode, a clamping motor is fixedly embedded in the right side end wall of the sliding groove, the left end of the clamping motor is in power connection with a screw shaft, the thread directions of the left portion and the right portion of the screw shaft are opposite, the screw shaft is in threaded fit connection with the thread blocks, two fixing rods which are bilaterally symmetrical are fixedly arranged on the bottom surface of the rotating plate, clamping rods are hinged to the lower ends of the fixing rods, clamping plates are fixed to the clamping rods and correspond to the clamping rods, and the clamping rods are hinged.