Automatic piece taking device of 3D printer

Abstract

The utility model provides an automatic piece taking device of a 3D printer, which comprises a working table, an automatic piece taking mechanism and an automatic printing mechanism are arranged on the working table, the automatic piece taking mechanism is arranged on one side of the upper part of the working table, the automatic printing mechanism is arranged on the other side of the working table, and the automatic piece taking mechanism comprises a vertical lifting assembly and a horizontal moving assembly. A material taking stirring frame is arranged at the upper part of the horizontal moving assembly; according to the 3D printer, automatic pick-up operation of objects printed by the automatic printing mechanism can be achieved through the automatic pick-up mechanism, and the problems that after printing of an existing 3D printer is completed, finished products in the existing 3D printer are usually manually taken away through hands or tools, manual actions still exist in the whole process, intelligence is not enough, and the production efficiency is high are solved. The problems that due to errors or negligence, taken-out articles or used tools fall off, and the 3D printer is damaged are solved, the time for stopping the machine to take out the articles is greatly shortened, and the machine is more intelligent, more convenient and more labor-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic piece-picking equipment, in particular to an automatic piece-picking device for a 3D printer. Background Art

[0002] 3D printing is a production technology that uses molten materials to stack products on a hot bed. The existing hot bed and 3D printer are fixed together. After printing, the bottom of the product is bonded to the hot bed and needs to be separated manually using a scraper. The scraper has a certain thickness and width, and it is easy to damage the bottom during the separation process. Moreover, the 3D printer cannot work before the product is completely taken out and removed, which delays a lot of production time.

[0003] With current 3D printers, after printing is completed, the finished product inside is often removed manually using hands or tools. The entire process still involves manual actions and is not intelligent enough. Sometimes, due to mistakes or negligence, the removed objects or used tools fall, causing damage to the 3D printer. Utility Model Content

[0004] In view of this, the utility model provides an automatic pickup device for a 3D printer, which can realize the automatic pickup operation of the items printed by the automatic printing mechanism through the automatic pickup mechanism, solving the problem that after the current 3D printer is printed, the finished product inside is often taken out manually by hand or tools, and the whole process still involves manual actions, which is not intelligent enough. Sometimes due to mistakes or negligence, the taken out items or the used tools fall, causing damage to the 3D printer. The device greatly reduces the time of stopping to pick up items, and is more intelligent, convenient and labor-saving.

[0005] In order to solve the above technical problems, the utility model provides a 3D printer automatic pickup device, including a workbench, on which an automatic pickup mechanism and an automatic printing mechanism are arranged.

[0006] Among them, the automatic pick-up mechanism is arranged on one side of the upper part of the workbench, and is used to automatically move the printed items and take them out to the collection basket pre-placed on the workbench;

[0007] The automatic printing mechanism is arranged on the other side of the workbench to realize the printing operation on the object to be printed located directly below it;

[0008] The automatic pickup mechanism includes a vertical lifting component arranged on one side of the upper working part and a horizontal moving component arranged on the vertical lifting component. The upper part of the horizontal moving component is provided with a material picking and shifting frame for automatically removing the printed objects. The utility model can realize the automatic pickup operation of the objects printed by the automatic printing mechanism through the automatic pickup mechanism, which solves the problem that the current 3D printers often use hands or tools to manually remove the finished products after printing, and the whole process still involves manual actions, which is not intelligent enough. Sometimes due to mistakes or negligence, the taken out objects or the used tools fall, causing damage to the 3D printer. The utility model greatly reduces the time of stopping to pick up objects, and is more intelligent, convenient and labor-saving.

[0009] There are two vertical lifting assemblies, which are respectively located at the front and rear sides of one end of the upper end of the workbench, each vertical lifting assembly includes two first sliding rods arranged at intervals on the workbench, each first sliding rod is provided with a first sliding block, a first driving motor is arranged between the two first sliding rods, a first screw is arranged at the end of the output shaft of the first driving motor, the end of the first screw is threadedly connected with a first threaded block, the first screw passes through the first threaded block, and the first threaded block is arranged on the outside of the horizontal moving assembly. The utility model can drive the first screw to rotate by rotating the output shaft of the first driving motor. Due to the threaded connection between the first threaded block and the first screw, the limiting effect of the horizontal moving assembly on the first threaded block and the first sliding block, and the guiding effect of the first sliding rod on the first sliding block, the rotation of the first screw will drive the first threaded block to move along the first sliding rod with the horizontal moving assembly and the first sliding block, thereby realizing the height adjustment operation of the horizontal moving assembly.

[0010] The horizontal moving assembly includes guide rails respectively arranged on the front and rear sides of the upper part of the workbench, two guide blocks are slidably arranged on each guide rail, a connecting shaft is arranged between the guide blocks in the two guide rails on the same straight line, a driven pulley is arranged on the connecting shaft on one side, a servo motor is arranged on the workbench, a driving pulley is arranged on the output shaft of the servo motor, a driving belt is arranged between the driving pulley and the driven pulley, a transmission pulley is arranged on the inner side of each guide block, a transmission belt is arranged between the transmission pulleys on the two guide blocks in the same guide rail on the same side, an adjuster for adjusting the tension of the adjuster is arranged in the transmission belt on one side, and a tensioner is arranged on the transmission belt on the other side. The pallet has a slide plate which is slidably arranged on the pallet and is located between two guide rails. The material picking and toggling frame is arranged on the slide plate. The utility model can drive the active pulley to rotate by rotating the output shaft of the driving motor. In addition, the driving action of the driving belt between the active pulley and the driven pulley causes the rotation of the active pulley to rotate with the driven pulley and the connecting shaft. The rotation of the connecting shaft can drive the conveyor belt, the pallet on the upper part of the conveyor belt, the slide plate on the upper part of the pallet and the material picking and toggling frame to move horizontally, thereby realizing the horizontal movement and vertical lifting of the material picking and toggling frame, which is convenient for automatically moving and removing the printed items, and is more labor-saving, convenient and efficient.

[0011] The automatic printing mechanism includes a first linear slide arranged at the other end of the upper part of the workbench, the lower part of the slider of the first linear slide is arranged together with the shell of the printer, the lower part of the slide rail of the first linear slide is provided with a second linear slide, the upper part of the slider of the second linear slide is fixedly arranged together with the lower part of the slide rail of the first linear slide, the lower part of the slide rail of the second linear slide is provided with a support plate, there are two second linear slides, and support plates are respectively arranged on the front and rear sides between the lower parts of the slide rails of the two second linear slides, and the lower part of each support plate is provided with a lifting platform for adjusting the height of the second linear slide and the first linear slide, the first linear slide and the second linear slide are both linear slides driven by a screw motor in the prior art, the driving action of the motor of the first linear slide can move the printer horizontally, and the driving action of the motor of the second linear slide can drive the printer to perform vertical movement printing operations, which is more convenient and efficient.

[0012] The lifting platform includes second sliding bars respectively arranged on the front and rear sides of the other end of the upper part of the workbench, a second sliding block is slidably arranged on the outer side of each second sliding bar, a placing plate is arranged between the two second sliding bars, a second threaded block is arranged on the outer side of the placing plate and between the two second sliding bars, a second screw is connected to the inner thread of the second threaded block, and a second driving motor is arranged on the upper part of the second screw. The utility model can drive the second screw to rotate by the rotation of the output shaft of the second driving motor; due to the threaded connection between the second threaded block and the second screw, the limiting effect of the horizontal moving assembly on the second threaded block and the second sliding block, and the guiding effect of the second sliding bar on the second sliding block, the rotation of the second screw will drive the second threaded block to move with the placing plate along the first sliding bar, thereby realizing the height adjustment operation of the object to be printed on the placing plate, and the operation is more convenient.

[0013] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0014] 1. The utility model can realize the automatic retrieval operation of the items printed by the automatic printing mechanism through the automatic retrieval mechanism, which solves the problem that after the current 3D printer is printed, the finished product inside is often taken out manually by hand or tools. The whole process still involves manual actions and is not intelligent enough. Sometimes due to mistakes or negligence, the taken out items or the tools used fall, causing damage to the 3D printer. The utility model greatly reduces the downtime time for retrieval, which is more intelligent, convenient and labor-saving.

[0015] 2. The utility model can drive the first screw to rotate by rotating the output shaft of the first driving motor. Due to the threaded connection between the first threaded block and the first screw, the limiting effect of the horizontal moving component on the first threaded block and the first slider, and the guiding effect of the first slider on the first slider, the rotation of the first screw will drive the first threaded block to move along the first slider with the horizontal moving component and the first slider, thereby realizing the height adjustment operation of the horizontal moving component.

[0016] 3. The utility model can drive the driving pulley to rotate by rotating the output shaft of the driving motor. In addition, due to the driving effect of the driving belt between the driving pulley and the driven pulley, the rotation of the driving pulley will drive the driven pulley and the connecting shaft to rotate together. The rotation of the connecting shaft can drive the conveyor belt, the card plate on the upper part of the conveyor belt, the slide plate on the upper part of the card plate, and the material picking and shifting frame to move horizontally, thereby realizing the horizontal movement and vertical lifting of the material picking and shifting frame, which is convenient for automatically shifting and removing the printed objects, and is more labor-saving, convenient and efficient.

[0017] 4. The utility model can drive the second screw to rotate by rotating the output shaft of the second driving motor. Due to the threaded connection between the second threaded block and the second screw, the limiting effect of the horizontal moving component on the second threaded block and the second slider, and the guiding effect of the second slider on the second slider, the rotation of the second screw will drive the second threaded block to move along the first slider with the placement plate, thereby realizing the height adjustment operation of the object to be printed on the placement plate, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the automatic pick-up device for a 3D printer of the utility model;

[0019] Figure 2 This is an enlarged view of point A of the utility model;

[0020] Figure 3 It is an enlarged view of point B of the present utility model.

[0021] Description of reference numerals: 100, workbench; 200, automatic pick-up mechanism; 210, vertical lifting assembly; 211, first slide bar; 212, first slide block; 213, first driving motor; 214, first screw rod; 215, first threaded block; 220, horizontal moving assembly; 221, guide rail; 222, guide block; 223, connecting shaft; 224, driven pulley; 225, servo motor; 226, driving pulley; 227 , driving belt; 228, transmission belt; 229, regulator; 230, card plate; 231, slide plate; 300, material picking and moving frame; 400, automatic printing mechanism; 410, first linear slide; 420, second linear slide; 430, support plate; 440, lifting platform; 441, second slide bar; 442, second slide block; 443, placement plate; 444, second threaded block; 445, second screw rod; 446, second driving motor. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the following will be combined with the appended drawings of the embodiment of the utility model. Figure 1-3 , the technical scheme of the embodiment of the utility model is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] like Figure 1-3 As shown: This embodiment provides a 3D printer automatic pickup device, including a workbench 100, on which an automatic pickup mechanism 200 and an automatic printing mechanism 400 are arranged.

[0024] The automatic pickup mechanism 200 is disposed on one side of the upper portion of the workbench 100 and is used to automatically move the printed items and remove them to a collection basket pre-placed on the workbench 100;

[0025] The automatic printing mechanism 400 is arranged on the other side of the workbench 100, and cooperates to realize the printing operation on the to-be-printed object located directly below it;

[0026] The automatic pickup mechanism 200 includes a vertical lifting component 210 arranged on one side of the upper working part and a horizontal moving component 220 arranged on the vertical lifting component 210. The upper part of the horizontal moving component 220 is provided with a material picking and shifting frame 300 for automatically removing the printed items. The utility model can realize the automatic pickup operation of the items printed by the automatic printing mechanism 400 through the automatic pickup mechanism 200, which solves the current 3D printer. After printing, the finished products inside are often removed manually by hand or tools. The whole process still involves manual actions and is not intelligent enough. Sometimes due to mistakes or negligence, the removed items or the tools used fall, causing damage to the 3D printer. The utility model greatly reduces the time of downtime for picking up items, and is more intelligent, convenient and labor-saving.

[0027] According to one embodiment of the utility model, Figure 1-3 As shown, there are two vertical lifting assemblies 210, which are respectively located at the front and rear sides of one end of the upper part of the workbench 100, each vertical lifting assembly 210 includes two first sliding bars 211 arranged at intervals on the workbench 100, each first sliding bar 211 is provided with a first sliding block 212, a first driving motor 213 is provided between the two first sliding bars 211, a first screw rod 214 is provided at the end of the output shaft of the first driving motor 213, a first threaded block 215 is threadedly connected to the end of the first screw rod 214, the first screw rod 214 passes through the first threaded block 215, and the first threaded block 215 is provided at the horizontal displacement. On the outside of the moving component 220, the utility model can drive the first screw 214 to rotate by rotating the output shaft of the first driving motor 213. Due to the threaded connection between the first threaded block 215 and the first screw 214, the limiting effect of the horizontal moving component 220 on the first threaded block 215 and the first slider 212, and the guiding effect of the first slider 211 on the first slider 212, the rotation of the first screw 214 will drive the first threaded block 215 to move with the horizontal moving component 220 and the first slider 212 along the first slider 211, thereby realizing the height adjustment operation of the horizontal moving component 220.

[0028] According to another embodiment of the present invention, Figure 1 and Figure 2As shown, the horizontal moving assembly 220 includes guide rails 221 respectively arranged on the front and rear sides of the upper part of the workbench 100, two guide blocks 222 are slidably arranged on each guide rail 221, a connecting shaft 223 is arranged between the guide blocks 222 in the two guide rails 221 on the same straight line, a driven pulley 224 is arranged on the connecting shaft 223 on one side, a servo motor 225 is arranged on the workbench 100, a driving pulley 226 is arranged on the output shaft of the servo motor 225, a driving belt 227 is arranged between the driving pulley 226 and the driven pulley 224, a transmission pulley is arranged on the inner side of each guide block 222, a transmission belt 228 is arranged between the transmission pulleys on the two guide blocks 222 in the same guide rail 221 on the same side, an adjuster 229 is arranged in the transmission belt 228 on one side, and the transmission belt 228 on the other side is tensioned by an adjuster 229. A card plate 230 is provided on 228, and a slide plate 231 is slidably provided on the card plate 230 and located between the two guide rails 221. The material picking and toggling frame 300 is arranged on the slide plate 231. The utility model can drive the active pulley 226 to rotate together by the output shaft of the servo motor 225, and coupled with the driving effect of the driving belt 227 between the active pulley 226 and the driven pulley 224, the rotation of the active pulley 226 will drive the driven pulley 224 and the connecting shaft 223 to rotate together, and the rotation of the connecting shaft 223 can drive the conveyor belt 228 and the card plate 230 on the conveyor belt 228 and the slide plate 231 on the card plate 230 and the material picking and toggling frame 300 to move horizontally, thereby realizing the horizontal movement and vertical lifting operation of the material picking and toggling frame 300, which is convenient for realizing the automatic toggling and removing operation of the printed objects more labor-saving, convenient and efficient.

[0029] According to another embodiment of the present invention, Figure 1 and Figure 3As shown, the automatic printing mechanism 400 includes a first linear slide 410 arranged at the other end of the upper part of the workbench 100, the lower part of the slider of the first linear slide 410 is arranged together with the housing of the printer, the lower part of the slide rail of the first linear slide 410 is provided with a second linear slide 420, the upper part of the slider of the second linear slide 420 is fixedly arranged together with the lower part of the slide rail of the first linear slide 410, the lower part of the slide rail of the second linear slide 420 is provided with a support plate 430, there are two second linear slides 420, and the lower parts of the slide rails of the two second linear slides 420 are spaced apart. Support plates 430 are respectively provided on the front and rear sides, and a lifting platform 440 for adjusting the height of the second linear slide 420 and the first linear slide 410 is provided at the lower part of each support plate 430. The first linear slide 410 and the second linear slide 420 are both linear slides driven by screw motors in the prior art. The printer can be moved horizontally by the driving action of the motor of the first linear slide 410, and the printer can be moved vertically by the driving action of the motor of the second linear slide 420, which is more convenient and efficient.

[0030] The lifting platform 440 includes second slide bars 441 respectively arranged at the front and rear sides of the other end of the upper part of the workbench 100, and a second slider 442 is slidably arranged on the outer side of each second slide bar 441, and a placement plate 443 is arranged between the two second sliders 442, and a second threaded block 444 is arranged on the outer side of the placement plate 443 and between the two second sliders 442, and a second screw rod 445 is connected to the inner thread of the second threaded block 444, and a second drive motor 446 is arranged on the upper part of the second screw rod 445. The utility model can be driven by the second drive motor The rotation of the output shaft of 446 drives the second screw 445 to rotate. Due to the threaded connection between the second threaded block 444 and the second screw 445, the limiting effect of the horizontal moving component 220 on the second threaded block 444 and the second slider 442, and the guiding effect of the second slider 441 on the second slider 442, the rotation of the second screw 445 will drive the second threaded block 444 to move along the first slider 211 with the placement plate 443, thereby realizing the height adjustment operation of the object to be printed on the placement plate 443, and the operation is more convenient.

[0031] The use of the utility model:

[0032] First of all, it should be made clear that the automatic pickup device involved in the utility model is mainly used for the automatic pickup operation of items printed by a 3D printer. The utility model takes the printing operation of the printer as an example to explain its use method in detail.

[0033] When it is necessary to print an object, the object to be printed is first placed on the placement plate 443 (the placement plate 443 has a certain viscosity), and then the first linear slide 410 and the second linear slide 420 are started to move with the printer to move in the plane to realize the printing operation on the object to be printed placed on the placement plate 443.

[0034] After the printing is completed, the output shaft of the first driving motor 213 is started to rotate, and the rotation of the output shaft of the first driving motor 213 drives the first screw rod 214 to rotate. Due to the threaded connection between the first threaded block 215 and the first screw rod 214, the limiting effect of the horizontal moving component 220 on the first threaded block 215 and the first slider 212, and the guiding effect of the first slide bar 211 on the first slider 212, the rotation of the first screw rod 214 will drive the first threaded block 215 to move along the first slide bar 211 with the horizontal moving component 220 and the material picking and shifting frame 300 to a suitable height from the printer (the height of the material picking and shifting frame 300 here is preferably a non-interference height between the top of the object on the placement plate 443 and the bottom of the print head of the printer), and then the output shaft of the servo motor 225 is started to rotate to drive the active pulley 226 to rotate together, and coupled with the driving effect of the driving belt 227 between the active pulley 226 and the driven pulley 224, the rotation of the active pulley 226 will drive the driven pulley 224 to rotate. The driven pulley 224 and the connecting shaft 223 rotate together, and the rotation of the connecting shaft 223 can drive the conveyor belt 228, the card plate 230 on the conveyor belt 228, the slide plate 231 on the card plate 230 and the material picking and shifting frame 300 to move horizontally. The rotation of the first screw rod 214 will drive the first threaded block 215 to move with the horizontal moving component 220 and the material picking and shifting frame 300 along the first slide bar 211 to a suitable height from the printer (until the material picking and shifting frame 300 moves to a position directly above where the printed object can be pushed down), and then the output shaft of the first drive motor 213 is started to rotate in the reverse direction to drive the material picking and shifting frame 300 to move downward to a height where the printed object can be pushed down, and then the output shaft of the servo motor 225 is started to rotate in the reverse direction until the printed objects on the placement plate 443 are pushed to slide into the collection basket pre-placed on the workbench 100 and located between the horizontal moving components 220.

[0035] The utility model can realize the automatic pickup operation of the items printed by the automatic printing mechanism 400 through the automatic pickup mechanism 200, which solves the problem that the current 3D printer, after printing, often uses hands or tools to manually remove the finished products inside, and the whole process still involves manual actions, which is not intelligent enough. Sometimes due to mistakes or negligence, the taken out items or the tools used fall, causing damage to the 3D printer. The utility model greatly reduces the downtime time for picking up items, and is more intelligent, convenient and labor-saving.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A 3D printer automatic pick-up device, comprising a workbench (100), Features: The workbench (100) is provided with an automatic pickup mechanism (200) and an automatic printing mechanism (400). The automatic object removal mechanism (200) is arranged on one side of the upper part of the workbench (100) and is used to automatically move the printed objects and remove them to a collection basket pre-placed on the workbench (100); An automatic printing mechanism (400) is arranged on the other side of the workbench (100) and cooperates to implement a printing operation on an object to be printed located directly below the automatic printing mechanism (400); The automatic object removal mechanism (200) comprises a vertical lifting assembly (210) arranged on one side of the upper working part and a horizontal moving assembly (220) arranged on the vertical lifting assembly (210); the upper part of the horizontal moving assembly (220) is provided with a material removal and shifting frame (300) for automatically removing the printed objects.

2. The 3D printer automatic pick-up device according to claim 1, Features: There are two vertical lifting assemblies (210), which are respectively located at the front and rear sides of one end of the upper part of the workbench (100), each vertical lifting assembly (210) comprises two first sliding bars (211) arranged at intervals on the workbench (100), each of the first sliding bars (211) is provided with a first sliding block (212), a first driving motor (213) is provided between the two first sliding bars (211), a first screw rod (214) is provided at the end of the output shaft of the first driving motor (213), the end of the first screw rod (214) is threadedly connected with a first thread block (215), the first screw rod (214) passes through the first thread block (215), and the first thread block (215) is provided on the outer side of the horizontal moving assembly (220).

3. The 3D printer automatic pick-up device according to claim 2, Features: The horizontal moving assembly (220) comprises guide rails (221) respectively arranged on the front and rear sides of the upper part of the workbench (100), two guide blocks (222) are slidably arranged on each of the guide rails (221), a connecting shaft (223) is arranged between the guide blocks (222) in the two guide rails (221) on the same straight line, a driven pulley (224) is arranged on the connecting shaft (223) on one side, a servo motor (225) is arranged on the workbench (100), a driving pulley (226) is arranged on the output shaft of the servo motor (225), and the driving pulley (226) and the driven pulley (224) are arranged on the output shaft of the servo motor (225). A driving belt (227) is arranged between the guide blocks (24), a driving pulley is arranged on the inner side of each guide block (222), a transmission belt (228) is arranged between the transmission pulleys on the two guide blocks (222) in the same guide rail (221) on the same side, an adjuster (229) for tensioning an adjuster (229) is arranged in the transmission belt (228) on one side, a clamping plate (230) is arranged on the transmission belt (228) on the other side, a slide plate (231) is slidably arranged on the clamping plate (230) and located between the two guide rails (221), and the material taking and moving frame (300) is arranged on the slide plate (231).

4. The 3D printer automatic pick-up device according to claim 3, Features: The automatic printing mechanism (400) includes a first linear slide (410) arranged at the other end of the upper part of the workbench (100), the lower part of the slider of the first linear slide (410) is arranged together with the shell of the printer, the lower part of the slide rail of the first linear slide (410) is provided with a second linear slide (420), the upper part of the slider of the second linear slide (420) is fixedly arranged together with the lower part of the slide rail of the first linear slide (410), and the lower part of the slide rail of the second linear slide (420) is provided with a support plate (430).

5. The automatic 3D printer pick-up device according to claim 4, Features: There are two second linear slides (420), and support plates (430) are respectively arranged on the front and rear sides between the lower parts of the slide rails of the two second linear slides (420), and a lifting platform (440) is arranged at the lower part of each support plate (430) for adjusting the height of the second linear slide (420) and the first linear slide (410).

6. The automatic 3D printer pick-up device according to claim 5, Features: The lifting platform (440) includes second sliding rods (441) respectively arranged on the front and rear sides of the other end of the upper part of the workbench (100), and a second sliding block (442) is slidably arranged on the outer side of each second sliding rod (441), and a placement plate (443) is arranged between the two second sliding blocks (442), and a second threaded block (444) is arranged on the outer side of the placement plate (443) and between the two second sliding blocks (442), and the second threaded block (444) is internally threadedly connected to a second screw rod (445), and a second driving motor (446) is arranged on the upper part of the second screw rod (445).

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