Plate turnover device

Abstract

The utility model provides a plate turnover device, which belongs to the technical field of object turnover and comprises a conveying belt mechanism, a turnover mechanism and an output belt mechanism which are sequentially connected end to end. The conveying belt mechanism is used for conveying plates to be turned over and comprises a mechanism body and an adjusting baffle assembly fixedly connected to the output end. The overturning mechanism comprises two supporting tables, two connecting columns, a first driving piece and an overturning assembly. The two connecting columns are hinged to the corresponding supporting tables respectively. The first driving piece is fixedly connected to one supporting table and used for driving the connecting column to rotate. The two ends of the overturning assembly are fixedly connected with the connecting columns correspondingly. A guide column and a clamping assembly connected to the guide column in a sliding mode are fixedly connected between the two ends of the overturning assembly, and the clamping assembly is used for clamping plates with different widths. And the output belt mechanism is used for outputting the overturned plates, the overturning requirements of the plates of different types and different sizes can be met, and the problem that existing manual overturning is low in efficiency is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of object flipping, and particularly relates to a plate flipping device. Background Art

[0002] In the fields of construction and decoration construction, various types of plates (such as gypsum boards, fiber boards, metal composite boards, wood boards, etc.) are widely used as basic building materials. Due to differences in usage scenarios, plates of different materials often need to undergo various processing procedures (including but not limited to cutting, drilling, milling, surface polishing, etc.) to meet the final construction requirements. In the actual use process, about 65% of the plate processing technologies require differential processing of the front and back sides of the plates, which makes the flipping operation of the plates an essential link in the processing process.

[0003] There are mainly two methods for adapting the flipping methods and direction adjustment methods of different types and sizes of plates. One is to use a 6-axis industrial robot to clamp the plate and achieve flipping through the multi-degree-of-freedom movement of the robotic arm. Although robot flipping has automation capabilities, this method requires an additional transfer table to assist in positioning, resulting in high equipment costs. At the same time, the movement trajectory of the robot is complex, and the flipping cycle is long, making it difficult to match the processing cycle of high-speed continuous production, restricting the improvement of the overall production efficiency and unable to meet the production requirements of large-scale and high throughput. The other is manual flipping. Although manual operation has a certain degree of flexibility and can adapt to plates of different specifications, long-term repetitive operations will lead to high labor intensity and easy fatigue of the operators, thereby affecting work efficiency. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a plate flipping device that can adapt to the flipping requirements of different types and sizes of plates and solve the problem of low efficiency of existing manual flipping.

[0005] To achieve the above object and other related objects, the present utility model provides a plate flipping device, which includes a conveyor belt mechanism, a flipping mechanism, and an output belt mechanism that are connected end to end in sequence;

[0006] The conveyor belt mechanism is used to convey the plate to be flipped, and includes a mechanism main body and an adjustment baffle assembly fixedly connected to the output end;

[0007] The flipping mechanism includes two support platforms, two connecting columns, a first driving member, and a flipping assembly; the two connecting columns are respectively hinged on the corresponding support platforms; the first driving member is fixedly connected to one of the support platforms and is used to drive the connecting column to rotate; both ends of the flipping assembly are fixedly connected to the connecting column; a guiding column is fixedly connected between both ends of the flipping assembly, and a clamping assembly is slidably connected to the guiding column for clamping plates of different widths;

[0008] The output belt mechanism is used to output the sheet that has been flipped.

[0009] Optionally, the adjusting baffle assembly includes a baffle, an arc baffle, and an adjusting block for adjusting the arc baffle; the arc baffle and the baffle are correspondingly arranged at the top; one end of the arc baffle is hinged to the top of the conveyor belt mechanism; a strip-shaped chute is provided at the top of the conveyor belt mechanism, and the adjusting block is slidably connected in the strip-shaped groove.

[0010] Optionally, the connecting column includes a connecting block and a rotating shaft; the connecting block is coaxially fixed with the rotating shaft, and the connecting block is detachably connected to the end of the flipping assembly; the rotating shaft is hinged on the support platform;

[0011] The first driving member includes a first motor and a first driven gear; a first driving gear is coaxially and fixedly connected to the output end of the first motor, and the first driving gear is engaged with the first driven gear; the first driven gear is fixedly connected to the end of the rotating shaft away from the connecting block.

[0012] Optionally, the flipping assembly includes two flipping support plates at the end; there are multiple guiding columns, and the multiple guiding columns are fixedly connected to the two flipping support plates to form a main body of the flipping frame.

[0013] Optionally, a pushing and pulling motor is fixedly connected to the inner side of the flipping support plate; the output direction of the pushing and pulling motor is parallel to the guiding column, and a pushing and pulling plate is fixedly connected to the output end of the pushing and pulling motor; the clamping assembly is slidably connected to the guiding column through the pushing and pulling plate.

[0014] Optionally, the clamping assembly includes a second driving member and two groups of clamping units arranged symmetrically;

[0015] The two groups of clamping units respectively include clamping plates, an upper conveying unit, a lower conveying unit, and a limiting unit installed on the clamping plates; a channel for sheet conveying is provided between the upper conveying unit and the lower conveying unit, and when the sheet is in the conveying channel between the upper conveying unit and the lower conveying unit, the limiting unit can limit the sheet.

[0016] Optionally, the upper conveying unit and the lower conveying unit are symmetrically arranged; the upper conveying unit includes an upper conveyor belt, an upper driving roller and an upper tensioning roller vertically hinged on the clamping plate; the lower conveying unit includes a lower conveyor belt, a lower driving roller and a lower tensioning roller vertically hinged on the clamping plate.

[0017] Optionally, an upper driving gear is fixedly connected to the outer end of the upper driving roller; a lower driving gear is fixedly connected to the outer end of the lower driving roller; the upper driving gear and the lower driving gear are used in cooperation.

[0018] Optionally, the second driving member includes a second motor, a second driven gear, and a transmission shaft;

[0019] The output end of the second motor is coaxially and fixedly connected with a second driving gear, and the second driving gear is engaged with the second driven gear;

[0020] The second driven gear and the transmission shaft are coaxially fixed;

[0021] Both ends of the transmission shaft are respectively hinged to two flipping support plates; the transmission shaft is used in cooperation with the lower conveyor belt.

[0022] Optionally, the limiting unit includes a telescopic motor and a U-shaped limiting plate fixed to the output end of the telescopic motor; the U-shaped limiting plate is adapted to the sheet conveying channel between the upper conveying unit and the lower conveying unit.

[0023] As described above, the sheet flipping device of the present utility model has at least the following beneficial effects:

[0024] Through the head-to-tail arrangement of the conveyor belt mechanism, the flipping mechanism, and the output belt mechanism, the present utility model forms a coherent production line layout. During the conveying, flipping, and output processes of the sheet, no manual intervention is required, realizing fully automated operation, greatly improving production efficiency, and adapting to the production rhythm of high-speed production lines; the guiding columns installed in the flipping mechanism and the clamping components slidably connected to the guiding columns can automatically adjust the clamping distance according to the width of the sheet, ensuring stable clamping and reliable flipping of sheets of different sizes. Cooperating with the adjustable baffle component fixedly connected to the output end, it ensures that sheets of different sizes can be accurately conveyed into the flipping mechanism, improving the versatility and adaptability of the equipment; replacing manual turning with mechanical automation reduces the labor intensity of operators, avoids safety hazards caused by fatigue or operation errors, ensures the stability and safety of the production process, and effectively solves the problems of low efficiency and insufficient safety in the process of manually flipping sheets in the prior art.

[0025] By optimizing the structural design of the clamping components, the present utility model adopts two groups of clamping units arranged symmetrically left and right, and each group of clamping units is further split into an upper conveying unit and a lower conveying unit that are symmetrically arranged up and down. At the same time, a limiting unit is added to achieve stable clamping and conveying of the sheet during the flipping process; through the clamping channel between the upper conveying unit and the lower conveying unit that are symmetrically arranged up and down, the sheet is always subjected to uniform clamping force during the conveying and flipping processes, avoiding offset or slipping caused by uneven force and improving the flipping stability; the limiting unit restricts the sheet after it enters the clamping channel, preventing it from accidentally falling during high-speed conveying or flipping, ensuring the safety and reliability of the processing process.

[0026] The utility model optimizes the power transmission structure, installs a second driving member in the clamping assembly, and splits the second driving member into a second motor, a second driven gear and a transmission shaft. The transmission shaft is driven by the second motor to transmit power to two groups of clamping units symmetrically arranged at both ends of the transmission shaft, ensuring balanced forces on the left and right clamping units; the upper transmission gear and the lower transmission gear of the same specification are engaged for transmission, so that the upper transmission roller of the upper conveying unit and the lower transmission roller of the lower conveying unit maintain exactly the same linear speed, eliminating the friction damage to the surface of the plate caused by the speed difference; the transmission shaft is integrally designed to drive the bilateral clamping units at the same time, reducing the driving elements compared with the independent driving mode, reducing the failure rate. The gear transmission system has an accurate speed ratio relationship, avoiding the possible slipping phenomenon of the conveyor belt, ensuring the stability of long-term operation, realizing the synchronous and precise driving of the upper and lower conveying units, and effectively solving the problems of plate jamming, offset or surface damage caused by asynchronous conveying in the traditional flipping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 is a schematic diagram of the overall structure of the flipping mechanism of the utility model;

[0029] Figure 3 is a schematic diagram of the overall structure of the flipping assembly of the utility model;

[0030] Figure 4 is a schematic diagram of the power system of the clamping assembly of the utility model;

[0031] Figure 5 is a schematic diagram of the overall structure of the clamping assembly of the utility model;

[0032] Figure 6 is a schematic diagram of the cooperation between the clamping assembly and the limiting unit of the utility model;

[0033] Figure 7 For the utility model Figure 6 is an enlarged schematic diagram at position A in

[0034] Description of Component Labels

[0035] 1. Mechanism main body; 101. Baffle; 102. Arc baffle; 103. Adjusting block; 2. Plate; 3. Flipping mechanism; 301. Support platform; 302. Connecting column; 303. First driving part; 4. Flipping assembly; 401. Flipping support plate; 402. Guide column; 403. Push-pull plate; 5. Clamping assembly; 501. Second driving part; 502. Transmission shaft; 6. Upper conveying unit; 601. Upper conveyor belt; 602. Upper driving roller; 603. Upper driving gear; 7. Lower conveying unit; 701. Lower conveyor belt; 702. Lower driving roller; 703. Lower driving gear; 8. Limiting unit; 801. Telescopic motor; 802. U-shaped limiting plate; 9. Output belt mechanism. Detailed implementation manners

[0036] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0037] Please refer to Figures 1 to 7 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0038] The following each embodiment is only for illustration. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiment.

[0039] Please refer to Figures 1 to 7, the present utility model provides a plate turning device, which includes a conveyor belt mechanism, a turning mechanism 3, and an output belt mechanism 9 that are connected end to end in sequence; the conveyor belt mechanism is used to convey the plate 2 to be turned, and includes a mechanism main body 1 and an adjusting baffle 101 assembly fixedly connected to the output end; the turning mechanism 3 includes two support platforms 301, two connecting columns 302, a first driving member 303, and a turning assembly 4; the two connecting columns 302 are respectively hinged to the corresponding support platforms 301; the first driving member 303 is fixedly connected to one of the support platforms 301 and is used to drive the connecting column 302 to rotate; both ends of the turning assembly 4 are fixedly connected to the connecting column 302; a guiding column 402 is fixedly connected between both ends of the turning assembly 4, and a clamping assembly 5 slidably connected to the guiding column 402 is used to clamp plates 2 with different widths; the output belt mechanism 9 is used to output the turned plates 2. In this application, through the end-to-end arrangement of the conveyor belt mechanism, the turning mechanism 3, and the output belt mechanism 9, a coherent production line layout is formed. During the transportation, turning, and output of the plate 2, no manual intervention is required, realizing fully automated operation, greatly improving production efficiency, and adapting to the production rhythm of high-speed production lines; the guiding column 402 added to the turning mechanism 3 and the clamping assembly 5 slidably connected to the guiding column 402 can automatically adjust the clamping distance according to the width of the plate 2, ensuring stable clamping and reliable turning of plates 2 with different sizes. Cooperating with the adjusting baffle 101 assembly fixedly connected to the output end, it ensures that plates 2 with different sizes can be accurately conveyed into the turning mechanism 3, improving the versatility and adaptability of the equipment; replacing manual turning with mechanical automation reduces the labor intensity of operators, avoids safety hazards caused by fatigue or operation errors, ensures the stability and safety of the production process, and effectively solves the problems of low efficiency and insufficient safety in the process of manually turning plates in the prior art.

[0040] In this embodiment, please refer to Figure 1 , the adjusting baffle 101 assembly includes a baffle 101, an arc-shaped baffle 102, and an adjusting block 103 for adjusting the arc-shaped baffle 102; the arc-shaped baffle 102 and the baffle 101 are arranged correspondingly at the top; one end of the arc-shaped baffle 102 is hinged to the top of the conveyor belt mechanism; a strip-shaped chute is opened at the top of the conveyor belt mechanism, and the adjusting block 103 is slidably connected in the strip-shaped groove (here, a clamping structure is installed in the adjusting block 103, which can adjust the tightness between the adjusting block 103 and the strip-shaped groove by adjusting the tightness of the adjusting bolt, and adjust the position fixedly connected in the strip-shaped groove through the clamping structure). In this application, by changing the position of the adjusting block 103 in the strip-shaped groove, the rotation angle of the arc-shaped baffle 102 is changed, and further the distance between the arc-shaped baffle 102 and the baffle 101 is changed to adapt to the transportation of plates 2 with different sizes.

[0041] In this embodiment, please refer to Figure 1 and Figure 2, the connecting column 302 includes a connecting block and a rotating shaft; the connecting block is coaxially fixed to the rotating shaft, and the connecting block is detachably connected to the end of the flipping assembly 4; the rotating shaft is hinged on the support platform 301; the first driving member 303 includes a first motor and a first driven gear; the output end of the first motor is coaxially fixedly connected with a first driving gear, and the first driving gear is engaged with the first driven gear (here, the first driving gear is engaged with the first driven gear, or can be connected by a chain. The first motor can be a servo motor, and the servo motor is a prior art and will not be elaborated here); the first driven gear is fixedly connected to the end of the rotating shaft away from the connecting block. In this application, the first motor drives the first driving gear to rotate, the first driving gear drives the first driven gear to rotate, the first driven gear drives the rotating shaft to rotate, the rotating shaft drives the connecting block to rotate, and further drives the flipping assembly 4 to rotate, realizing the rotation of the plate 2.

[0042] In this embodiment, please refer to Figure 2 and Figure 3 , the flipping assembly 4 includes two flipping support plates 401 at the end; there are multiple guiding columns 402, and the multiple guiding columns 402 are fixedly connected to the two flipping support plates 401 to form a flipping frame main body. A pushing and pulling motor is fixedly connected to the inner side of the flipping support plate 401; the output direction of the pushing and pulling motor is parallel to the guiding column 402, and the output end of the pushing and pulling motor is fixedly connected with a pushing and pulling plate 403 (here, the pushing and pulling motor can be an electric push rod, and the electric push rod is a prior art and will not be elaborated here); the clamping assembly 5 is slidably connected to the guiding column 402 through the pushing and pulling plate 403. In this application, the pushing and pulling motor drives the clamping assembly 5 fixedly connected to the pushing and pulling plate 403 to slide along the direction of the guiding rod, thereby adjusting the distance between the two sets of clamping assemblies 5 and completing the clamping and fixing of plates 2 of different sizes.

[0043] In this embodiment, please refer to Figures 2 to 7, the clamping assembly 5 includes a second driving member 501 and two sets of clamping units symmetrically arranged; each of the two sets of clamping units includes a clamping plate and an upper conveying unit 6, a lower conveying unit 7 and a limiting unit 8 mounted on the clamping plate; a channel for conveying the plate 2 is provided between the upper conveying unit 6 and the lower conveying unit 7. When the plate 2 is located in the conveying channel between the upper conveying unit 6 and the lower conveying unit 7, the limiting unit 8 can limit the plate 2. The limiting unit 8 includes a telescopic motor 801 and a U-shaped limiting plate 802 fixed to the output end of the telescopic motor 801 (here, the telescopic motor 801 can be an electric push rod, and the electric push rod is a prior art and will not be elaborated here); the U-shaped limiting plate 802 is adapted to the plate 2 conveying channel between the upper conveying unit 6 and the lower conveying unit 7. In this application, by optimizing the structural design of the clamping assembly 5, two sets of clamping units arranged symmetrically left and right are adopted, and each set of clamping units is further split into an upper conveying unit 6 and a lower conveying unit 7 that are symmetrically arranged up and down. At the same time, a limiting unit 8 is added to achieve stable clamping and conveying of the plate 2 during the flipping process; through the clamping channel between the upper conveying unit 6 and the lower conveying unit 7 that are symmetrically arranged up and down, the plate 2 is always subjected to a uniform clamping force during the conveying and flipping processes, avoiding offset or slipping caused by uneven force and improving the flipping stability; the limiting unit 8 restricts the plate 2 after it enters the clamping channel to prevent it from accidentally falling during high-speed conveying or flipping, ensuring the safety and reliability of the processing process.

[0044] In this embodiment, please refer to Figures 2 to 5, the upper conveying unit 6 and the lower conveying unit 7 are symmetrically arranged; the upper conveying unit 6 includes an upper conveyor belt 601, an upper driving roller 602 vertically hinged on the clamping plate, and an upper tensioning roller; the lower conveying unit 7 includes a lower conveyor belt 701, a lower driving roller 702 vertically hinged on the clamping plate, and a lower tensioning roller. The outer end of the upper driving roller 602 is fixedly connected with an upper driving gear 603; the outer end of the lower driving roller 702 is fixedly connected with a lower driving gear 703; the upper driving gear 603 and the lower driving gear 703 are used in cooperation. The second driving member 501 includes a second motor, a second driven gear, and a transmission shaft 502; the output end of the second motor is coaxially and fixedly connected with a second driving gear, and the second driving gear is in cooperation with the second driven gear; the second driven gear and the transmission shaft 502 are coaxially fixed; both ends of the transmission shaft 502 are respectively hinged to two flipping support plates 401; the transmission shaft 502 is used in cooperation with the lower conveyor belt 701. In this application, by optimizing the power transmission structure, a second driving member 501 is added to the clamping assembly 5, and the second driving member 501 is split into a second motor, a second driven gear, and a transmission shaft 502. The transmission shaft 502 is driven by the second motor to transmit power to two groups of clamping units symmetrically arranged at both ends of the transmission shaft 502, ensuring balanced force on the left and right clamping units; the upper driving gear 603 and the lower driving gear 703 of the same specification are meshed and driven, so that the upper driving roller 602 of the upper conveying unit 6 and the lower driving roller 702 of the lower conveying unit 7 maintain exactly the same linear speed, eliminating the surface friction damage of the sheet 2 caused by the speed difference; the transmission shaft 502 is integrally designed to drive the bilateral clamping units at the same time, reducing the driving elements compared with the independent driving mode, reducing the failure rate. The gear transmission system has an accurate speed ratio relationship, avoiding the possible slipping phenomenon of the conveyor belt, ensuring the stability of long-term operation, realizing the synchronous and precise driving of the upper and lower conveying units 7, and effectively solving the problems such as jamming, offset or surface damage of the sheet 2 caused by asynchronous conveying in the traditional flipping mechanism 3.

[0045] In summary, the present utility model overcomes various shortcomings in the prior art.

[0046] The above embodiments merely illustrate the principles and effects of the present utility model, rather than limiting the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A plate turning device, characterized in that: It includes a conveyor belt mechanism, a turning mechanism and an output belt mechanism which are connected in sequence end to end; The conveyor belt mechanism is used to convey the plate to be turned over, and includes a mechanism body and an adjustment baffle assembly fixedly connected to the output end; The flipping mechanism comprises two support platforms, two connecting columns, a first driving member and a flipping assembly; the two connecting columns are respectively hinged on the corresponding support platforms; the first driving member is fixedly connected to one of the support platforms and is used to drive the connecting column to rotate; the two ends of the flipping assembly are respectively fixedly connected to the connecting columns; a guide column and a clamping assembly slidably connected to the guide column are fixedly connected between the two ends of the flipping assembly and are used to clamp plates of different widths; The output belt mechanism is used to output the turned-over plate.

2. The plate turning device according to claim 1, characterized in that: The adjustable baffle assembly includes a baffle, an arc-shaped baffle and an adjusting block for adjusting the arc-shaped baffle; the arc-shaped baffle is arranged at the top corresponding to the baffle; one end of the arc-shaped baffle is hinged to the top of the conveyor belt mechanism; a strip slide groove is opened on the top of the conveyor belt mechanism, and the adjusting block is slidably connected in the strip groove.

3. The plate turning device according to claim 1, characterized in that: The connecting column comprises a connecting block and a rotating shaft; the connecting block is coaxially fixed with the rotating shaft, and the connecting block is detachably connected to the end of the flip assembly; the rotating shaft is hinged on the support platform; The first driving member includes a first motor and a first driven gear; the output end of the first motor is coaxially fixedly connected with a first driving gear, and the first driving gear cooperates with the first driven gear; the first driven gear is fixedly connected to one end of the rotating shaft away from the connecting block.

4. The plate turning device according to claim 1, characterized in that: The flip assembly includes two flip support plates located at the ends; there are multiple guide columns, and the multiple guide columns are fixedly connected with the two flip support plates to form a flip frame body.

5. The plate turning device according to claim 4, characterized in that: A push-pull motor is fixedly connected to the inner side of the flip support plate; the output direction of the push-pull motor is parallel to the guide column, and the output end of the push-pull motor is fixedly connected to a push-pull plate; the clamping assembly is slidably connected to the guide column through the push-pull plate.

6. The plate turning device according to claim 4, characterized in that: The clamping assembly includes a second driving member and two groups of clamping units arranged symmetrically; The two groups of clamping units respectively include a clamping plate and an upper conveying unit, a lower conveying unit and a limiting unit installed on the clamping plate; a channel for conveying the plate is arranged between the upper conveying unit and the lower conveying unit, and when the plate is located in the conveying channel between the upper conveying unit and the lower conveying unit, the limiting unit can limit the plate.

7. The plate turning device according to claim 6, characterized in that: The upper conveying unit and the lower conveying unit are arranged symmetrically; the upper conveying unit includes an upper conveying belt and an upper transmission roller and an upper tensioning roller vertically hinged on the clamping plate; the lower conveying unit includes a lower conveying belt and a lower transmission roller and a lower tensioning roller vertically hinged on the clamping plate.

8. The plate turning device according to claim 7, characterized in that: The outer end of the upper transmission roller is fixedly connected with an upper transmission gear; the outer end of the lower transmission roller is fixedly connected with a lower transmission gear; the upper transmission gear and the lower transmission gear are used in coordination.

9. The plate turning device according to claim 8, characterized in that: The second driving member includes a second motor, a second driven gear and a transmission shaft; The output end of the second motor is coaxially fixedly connected with a second driving gear, and the second driving gear cooperates with the second driven gear; The second driven gear is coaxially fixed with the transmission shaft; The two ends of the transmission shaft are respectively hinged to two flip support plates; the transmission shaft is used in conjunction with the lower conveyor belt.

10. The plate turning device according to claim 6, characterized in that: The limiting unit comprises a telescopic motor and a U-shaped limiting plate fixed at the output end of the telescopic motor; the U-shaped limiting plate is adapted to the plate conveying channel between the upper conveying unit and the lower conveying unit.

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