Packaging bag printing and conveying device

Abstract

The invention discloses a packaging bag printing and conveying device which comprises a rack, an unwinding mechanism, a conveying mechanism, a winding mechanism and a positioning mechanism, the unwinding mechanism, the conveying mechanism, the winding mechanism and the positioning mechanism are all installed on the rack, the unwinding mechanism, the conveying mechanism and the winding mechanism are arranged in sequence, and the positioning mechanism is installed on the rack. The positioning mechanism is arranged between the unwinding mechanism and the conveying mechanism, and is also arranged between the conveying mechanism and the winding mechanism; the positioning mechanism comprises an adsorption mechanism and a locking mechanism, the adsorption mechanism is arranged between the unwinding mechanism and the winding mechanism, and the conveying mechanisms are arranged at the two ends of the adsorption mechanism; the locking mechanisms are arranged at the two ends of the adsorption mechanism. The packaging bag printing and conveying mechanism can be matched with the unwinding mechanism and the winding mechanism to position and lock the packaging bag through the positioning mechanism according to the printing requirement of the packaging bag, and therefore the packaging bag to be printed can be accurately positioned to a printing station.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, and in particular to a packaging bag printing and conveying device. Background Art

[0002] The packaging bag printing conveyor is a device used to stably convey the packaging bags to the printing press during the printing process. It usually includes a conveyor belt, a guide device and a drive system to ensure that the packaging bags are conveyed at an appropriate speed and position, thereby achieving efficient and accurate printing. Existing packaging bag printing conveyors usually use various types of conveyor belts, such as flat belts, chains or roller conveyors to accommodate packaging bags of different shapes and materials; automatic control is achieved through a PLC system to optimize the conveying speed and position accuracy to meet the needs of the printing process; various sensors are integrated to detect and locate the packaging bags and improve the accuracy of the conveying; considering the compatibility of different printing presses and materials, the existing packaging bag printing conveyor mechanism can be quickly adjusted to meet different production needs; and considering the production environment, the conveyor device is usually easy to clean and maintain to ensure long-term operation and stability.

[0003] However, the existing packaging bag printing and conveying devices, especially the roller conveying type conveying devices, have insufficient positioning and limiting functions for the packaging bags, thereby affecting the printing accuracy and printing effect of the packaging bags, and further affecting the yield rate of product printing processing. Summary of the invention

[0004] Based on this, it is necessary to provide a packaging bag printing and conveying device to address the technical problems of insufficient positioning and limiting functions of existing packaging bag printing and conveying devices.

[0005] A packaging bag printing and conveying device comprises a frame, a unwinding mechanism, a conveying mechanism, a rewinding mechanism and a positioning mechanism, wherein the unwinding mechanism, the conveying mechanism, the rewinding mechanism and the positioning mechanism are all installed on the frame, wherein the unwinding mechanism, the conveying mechanism and the rewinding mechanism are arranged in sequence, the positioning mechanism is arranged between the unwinding mechanism and the conveying mechanism, and the positioning mechanism is also arranged between the conveying mechanism and the rewinding mechanism, so that the positioning mechanism can lock and position the packaging bag roll during the conveying process.

[0006] The positioning mechanism includes an adsorption mechanism and a locking mechanism. The adsorption mechanism is arranged between the unwinding mechanism and the rewinding mechanism, and the conveying mechanism is arranged at both ends of the adsorption mechanism, so that the packaging bags conveyed between the unwinding mechanism and the rewinding mechanism via the conveying mechanism can cooperate with the adsorption mechanism to pass through the adsorption mechanism; the locking mechanism is arranged at both ends of the adsorption mechanism to cooperate with the adsorption mechanism to clamp and lock the packaging bag rolls at both ends.

[0007] In one embodiment, the adsorption mechanism includes an air suction plate and a fan. The air suction plate is arranged on one side of the frame, and the fan is arranged on the other side of the frame corresponding to the air suction plate. Moreover, the air suction end of the fan is connected to the air outlet end of the air suction plate.

[0008] In one embodiment, the above-mentioned air suction plate is configured as a hollow structure, and the air suction plate is provided with a plurality of air suction holes and a plurality of air outlet holes, wherein the plurality of air suction holes are arranged on the top side surface of the air suction plate and are connected to the interior of the air suction plate; the plurality of air outlet holes are arranged on the bottom side surface of the air suction plate and are connected to the interior of the air suction plate, and the plurality of air outlet holes are connected to the air suction end of the fan.

[0009] In one embodiment, the locking mechanism includes a first locking component and a second locking component. The first locking component is disposed between the unwinding component and the air suction plate, and the second locking component is disposed between the air suction plate and the rewinding component.

[0010] In one embodiment, the first locking assembly includes a first traction roller, a first swing arm shaft, a first pressure roller, two first swing arms and a first driving rod. The first traction roller, the first swing arm shaft and the first pressure roller are all arranged on the adjacent side of the suction plate and are respectively rotatably connected to the frame; the two first swing arms are respectively arranged at both ends of the first swing arm shaft, and one end of each first swing arm away from the first swing arm shaft is connected to the end of the first pressure roller; the first driving rod is arranged on the other side of the frame relative to the first swing arm shaft, and the first driving rod is drivingly connected to the first swing arm shaft.

[0011] In one embodiment, the first pressing roller is disposed adjacent to the first pulling roller.

[0012] In one embodiment, the second locking assembly includes a second traction roller, a second swing arm shaft, a second pressure roller, two second swing arms and a second driving rod. The second traction roller, the second swing arm and the second pressure roller are arranged on the other side of the suction plate relative to the first locking assembly and are respectively rotatably connected to the frame; the two second swing arms are respectively arranged at both ends of the second swing arm shaft, and one end of each second swing arm away from the second swing arm shaft is connected to the end of the second pressure roller; the second driving rod is arranged on the other side of the frame relative to the second swing arm shaft, and the second driving rod is drivingly connected to the second swing arm shaft.

[0013] In one embodiment, the second pressing roller is disposed adjacent to the second pulling roller.

[0014] In one embodiment, the above-mentioned second locking assembly also includes an embossing shaft, and correspondingly, the two second swing arms are configured as L-shaped swing arms, the centers of the two second swing arms are respectively connected to the two ends of the second swing arm shaft, one end of the two second swing arms are respectively connected to the two ends of the second pressing roller, and the other end of the two second swing arms are respectively connected to the two ends of the embossing shaft.

[0015] In one embodiment, the above-mentioned air suction plates are provided in two, and correspondingly, two fans are provided, the two air suction plates are provided in parallel with each other at the top and bottom of one side of the frame, the two fans are provided at the other side of the frame corresponding to the two air suction plates respectively, and the two fans are connected to the corresponding air suction plates respectively.

[0016] In one embodiment, the above-mentioned first locking components are configured as two groups, the two groups of first locking components correspond to the two suction plates respectively, and each first locking component is configured on the adjacent side of the corresponding suction plate to cooperate with the corresponding suction plate to complete the positioning and locking of the packaging bag.

[0017] The above-mentioned packaging bag printing and conveying mechanism can position and lock the packaging bag according to the printing requirements of the packaging bag through the positioning mechanism in cooperation with the unwinding mechanism and the rewinding mechanism, so that the packaging bag to be printed can be accurately positioned at the printing station, and during the printing process of the packaging bag, the positioning mechanism can maintain the stability of the packaging bag at the working end of the printing module, thereby improving the printing accuracy, improving the printing effect, and further improving the printing production yield. The positioning mechanism includes an adsorption mechanism and a locking mechanism. The adsorption mechanism is set at the printing station corresponding to the printing end of the printing module. When the packaging bag to be printed is conveyed to the printing station, the adsorption mechanism is activated to adsorb and position the packaging bag. At this time, the locking mechanism clamps and locks the two ends of the packaging bag coil at the two ends of the adsorption mechanism, thereby ensuring the adsorption stability of the adsorption mechanism on the packaging bag, thereby improving the stability and printing accuracy of the packaging bag printing, thereby improving the printing effect of the packaging bag and improving the production yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a packaging bag printing and conveying device in one embodiment; Figure 2 It is a schematic diagram of the structure of a packaging bag printing and conveying device in one embodiment; Figure 3 It is a schematic diagram of the structure of a packaging bag printing and conveying device in one embodiment; Figure 4 for Figure 3 A schematic cross-sectional structure diagram of the AA portion in the illustrated embodiment; Figure 5 It is a schematic diagram of the partial structure of a packaging bag printing and conveying device in one embodiment. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0025] See also Figures 1 to 5 The present invention discloses a packaging bag printing and conveying device, which includes a frame 100, a reeling mechanism 200, a conveying mechanism 300, a reeling mechanism 400 and a positioning mechanism 500. The reeling mechanism 200, the conveying mechanism 300, the reeling mechanism 400 and the positioning mechanism 500 are all installed on the frame 100, wherein the reeling mechanism 200, the conveying mechanism 300 and the reeling mechanism 400 are arranged in sequence, the positioning mechanism 500 is arranged between the reeling mechanism 200 and the conveying mechanism 300, and the positioning mechanism 500 is also arranged on the conveying mechanism 300. 00 and the winding mechanism 400, so that the positioning mechanism 500 can lock and position the packaging bag coil during the conveying process. In actual production, the positioning mechanism 500 can cooperate with the unwinding mechanism 200 and the winding mechanism 400 to position and lock the packaging bag according to the printing requirements of the packaging bag, so that the packaging bag to be printed can be accurately positioned with the printing station, and in the printing process of the packaging bag, the positioning mechanism 500 can maintain the setting stability of the packaging bag at the working end of the printing module, so as to improve the printing accuracy, improve the printing effect, and then improve the printing production yield. Specifically, the positioning mechanism 500 includes an adsorption mechanism 510 and a locking mechanism. The adsorption mechanism 510 is arranged between the unwinding mechanism 200 and the rewinding mechanism 400, and the conveying mechanism 300 is arranged at both ends of the adsorption mechanism 510, so that the packaging bag conveyed by the conveying mechanism 300 between the unwinding mechanism 200 and the rewinding mechanism 400 can cooperate with the adsorption mechanism 510; the locking mechanism is arranged at both ends of the adsorption mechanism 510 to cooperate with the adsorption mechanism 510 to clamp and lock the packaging bag coil at both ends. In actual application, the adsorption mechanism 510 is arranged at the printing station corresponding to the printing end of the printing module. When the packaging bag to be printed is conveyed to the printing station, the adsorption mechanism 510 is started to adsorb and position the packaging bag. At this time, the locking mechanism clamps and locks the two ends of the packaging bag coil at both ends of the adsorption mechanism 510, so as to ensure the adsorption stability of the adsorption mechanism 510 on the packaging bag, thereby improving the stability and printing accuracy of the packaging bag printing, thereby improving the printing effect of the packaging bag and improving the production yield.

[0026] Further, the adsorption mechanism 510 includes an air suction plate 511 and a fan 512. The air suction plate 511 is arranged on one side of the frame 100, and the fan 512 is arranged on the other side of the frame 100 corresponding to the air suction plate 511, and the air suction end of the fan 512 is connected to the air outlet end of the air suction plate 511, so that, driven by the fan 512, the air suction end of the air suction plate 511 generates negative pressure to adsorb the packaging bag passing through the air suction end of the air suction plate 511. Specifically, the air suction plate 511 is arranged as a hollow structure, and the air suction plate 511 is provided with a plurality of air suction holes a and a plurality of air outlet holes b, wherein the plurality of air suction holes a are arranged on the top side surface of the air suction plate 511 and connected to the interior of the air suction plate 511; the plurality of air outlet holes b are arranged on the bottom side surface of the air suction plate 511 and connected to the interior of the air suction plate 511, and the plurality of air outlet holes b are connected to the air suction end of the fan 512. Thus, driven by the fan 512, the air outside the suction plate 511 is sucked into the interior of the suction plate 511 through a number of suction holes a, and then pumped to the fan 512 through a number of air outlet holes b, thereby forming a negative pressure on the top side surface of the suction plate 511, and then stably adsorbing the packaging bags passing through the top side surface of the suction plate 511.

[0027] Furthermore, the locking mechanism includes a first locking component 520 and a second locking component 530. The first locking component 520 is arranged between the unwinding component and the suction plate 511, and the second locking component 530 is arranged between the suction plate 511 and the rewinding component. Thus, the first locking component 520 and the second locking component 530 can cooperate with the suction plate 511 to clamp and lock the two ends of the packaging bag adsorbed by the suction plate 511, so as to maintain the stability of the printing process of the packaging bag.

[0028] Furthermore, the first locking assembly 520 includes a first traction roller 521, a first swing arm shaft 522, a first pressure roller 523, two first swing arms 524 and a first driving rod 525. The first traction roller 521, the first swing arm shaft 522 and the first pressure roller 523 are all arranged on the adjacent side of the suction plate 511 and are respectively rotatably connected to the frame 100; the two first swing arms 524 are respectively arranged at both ends of the first swing arm shaft 522, and one end of each first swing arm 524 away from the first swing arm shaft 522 is connected to the end of the first pressure roller 523; the first driving rod 525 is arranged on the other side of the frame 100 relative to the first swing arm shaft 522, and the first driving rod 525 is drivingly connected to the first swing arm shaft 522. Specifically, the first pressure roller 523 is arranged on the adjacent side of the first traction roller 521, so that when the first locking assembly 520 locks the packaging bag according to printing production requirements, the first driving rod 525 swings, and then drives the first swing arm shaft 522 to rotate, thereby driving the first pressure roller 523 to abut against the side surface of the first traction roller 521 through the two first swing arms 524, so as to clamp and lock the packaging bag passing through the surface of the first traction roller 521.

[0029] Furthermore, the second locking assembly 530 includes a second traction roller 531, a second swing arm shaft 532, a second pressure roller 533, two second swing arms 534 and a second driving rod 535. The second traction roller 531, the second swing arm 534 and the second pressure roller 533 are arranged on the other side of the suction plate 511 relative to the first locking assembly 520 and are respectively rotatably connected to the frame 100; the two second swing arms 534 are respectively arranged at both ends of the second swing arm shaft 532, and one end of each second swing arm 534 away from the second swing arm shaft 532 is connected to the end of the second pressure roller 533; the second driving rod 535 is arranged on the other side of the frame 100 relative to the second swing arm shaft 532, and the second driving rod 535 is drivingly connected to the second swing arm shaft 532. Specifically, the second pressure roller 533 is arranged on the adjacent side of the second traction roller 531, so that when the second locking assembly 530 locks the packaging bag according to printing production requirements, the second driving rod 535 swings, and then drives the second swing arm shaft 532 to rotate, thereby driving the second pressure roller 533 to abut against the side surface of the second traction roller 531 through the two second swing arms 534, so as to clamp and lock the packaging bag passing through the surface of the second traction roller 531.

[0030] Furthermore, the second locking assembly 530 also includes an embossing shaft 536, and correspondingly, the two second swing arms 534 are both configured as L-shaped swing arms, the centers of the two second swing arms 534 are respectively connected to the two ends of the second swing arm shaft 532, one end of the two second swing arms 534 is respectively connected to the two ends of the second pressing roller 533, and the other end of the two second swing arms 534 is respectively connected to the two ends of the embossing shaft 536, so that the second locking assembly 530 can select one between the second pressing roller 533 and the embossing shaft 536 to be pressed onto the side surface of the second traction roller 531 according to actual processing requirements, that is, when the packaging bag needs to be embossed after the printing process is completed, the embossing shaft 536 is pressed onto the second traction roller 531 to emboss the packaging bag passing through its side surface.

[0031] In one embodiment, two suction discs 511 are provided, and correspondingly, two fans 512 are provided. The two suction discs 511 are provided parallel to each other at the top and bottom of one side of the frame 100, and the two fans 512 are provided at the other side of the frame 100 corresponding to the two suction discs 511, and the two fans 512 are connected to the corresponding suction discs 511. In this embodiment, the first locking assembly 520 is provided in two groups, and the two groups of first locking assemblies 520 correspond to the two suction discs 511 one by one, and each first locking assembly 520 is provided at the adjacent side of the corresponding suction disc 511 to cooperate with the corresponding suction disc 511 to complete the positioning and locking of the packaging bag. When the packaging bag needs to be printed on both sides, after the packaging bag is printed at one of the first locking assemblies 520 and the suction disc 511, it can be turned over by the conveying mechanism 300, and the other first locking assembly 520 and the corresponding suction disc 511 can be used to position and print the other side surface of the packaging bag, thereby completing the printing process of both sides of the packaging bag.

[0032] In summary, the packaging bag printing and conveying mechanism disclosed in the present invention can position and lock the packaging bag according to the printing requirements of the packaging bag through the positioning mechanism in cooperation with the unwinding mechanism and the rewinding mechanism, so that the packaging bag to be printed can be accurately positioned at the printing station, and during the printing process of the packaging bag, the positioning mechanism can maintain the stability of the setting of the packaging bag at the working end of the printing module, thereby improving the printing accuracy, improving the printing effect, and further improving the printing production yield. The positioning mechanism includes an adsorption mechanism and a locking mechanism. The adsorption mechanism is arranged at the printing station corresponding to the printing end of the printing module. When the packaging bag to be printed is conveyed to the printing station, the adsorption mechanism is activated to adsorb and position the packaging bag. At this time, the locking mechanism clamps and locks the two ends of the packaging bag coil at the two ends of the adsorption mechanism, thereby ensuring the adsorption stability of the adsorption mechanism on the packaging bag, thereby improving the stability and printing accuracy of the packaging bag printing, thereby improving the printing effect of the packaging bag and improving the production yield.

[0033] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A packaging bag printing and conveying device, characterized in that: include: A frame, an unwinding mechanism, a conveying mechanism, a rewinding mechanism and a positioning mechanism, wherein the unwinding mechanism, the conveying mechanism, the rewinding mechanism and the positioning mechanism are all installed on the frame, wherein the unwinding mechanism, the conveying mechanism and the rewinding mechanism are arranged in sequence, the positioning mechanism is arranged between the unwinding mechanism and the conveying mechanism, and the positioning mechanism is also arranged between the conveying mechanism and the rewinding mechanism; The positioning mechanism comprises an adsorption mechanism and a locking mechanism. The adsorption mechanism is arranged between the unwinding mechanism and the rewinding mechanism, and the conveying mechanism is arranged at both ends of the adsorption mechanism; the locking mechanism is arranged at both ends of the adsorption mechanism.

2. The packaging bag printing and conveying device according to claim 1, characterized in that: The adsorption mechanism includes an air suction plate and a fan. The air suction plate is arranged on one side of the frame, and the fan is arranged on the other side of the frame corresponding to the air suction plate. In addition, the air suction end of the fan is connected to the air outlet end of the air suction plate.

3. The packaging bag printing and conveying device according to claim 2, characterized in that: The air suction plate is arranged as a hollow structure, and is provided with a plurality of air suction holes and a plurality of air outlet holes. The plurality of air suction holes are arranged on the top side surface of the air suction plate and are connected to the interior of the air suction plate; the plurality of air outlet holes are arranged on the bottom side surface of the air suction plate and are connected to the interior of the air suction plate, and the plurality of air outlet holes are connected to the air suction end of the fan.

4. The packaging bag printing and conveying device according to claim 3, characterized in that: The locking mechanism comprises a first locking component and a second locking component. The first locking component is arranged between the unwinding component and the air suction disc, and the second locking component is arranged between the air suction disc and the winding component.

5. The packaging bag printing and conveying device according to claim 4, characterized in that: The first locking assembly includes a first traction roller, a first swing arm shaft, a first pressure roller, two first swing arms and a first driving rod. The first traction roller, the first swing arm shaft and the first pressure roller are all arranged on the adjacent side of the suction plate and are respectively rotatably connected to the frame; the two first swing arms are respectively arranged at both ends of the first swing arm shaft, and one end of each first swing arm away from the first swing arm shaft is connected to the end of the first pressure roller; the first driving rod is arranged on the other side of the frame relative to the first swing arm shaft, and the first driving rod is drivingly connected to the first swing arm shaft.

6. The packaging bag printing and conveying device according to claim 5, characterized in that: The first pressing roller is disposed on the adjacent side of the first pulling roller.

7. The packaging bag printing and conveying device according to claim 6, characterized in that: The second locking assembly includes a second traction roller, a second swing arm shaft, a second pressure roller, two second swing arms and a second driving rod. The second traction roller, the second swing arm and the second pressure roller are arranged on the other side of the suction plate relative to the first locking assembly and are rotatably connected to the frame respectively; the two second swing arms are respectively arranged at both ends of the second swing arm shaft, and one end of each second swing arm away from the second swing arm shaft is connected to the end of the second pressure roller; the second driving rod is arranged on the other side of the frame relative to the second swing arm shaft, and the second driving rod is drivingly connected to the second swing arm shaft.

8. The packaging bag printing and conveying device according to claim 7, characterized in that: The second pressing roller is disposed on the adjacent side of the second pulling roller.

9. The packaging bag printing and conveying device according to claim 8, characterized in that: The second locking assembly also includes an embossing shaft, and correspondingly, the two second swing arms are arranged as L-shaped swing arms, the centers of the two second swing arms are respectively connected to the two ends of the second swing arm shaft, one end of the two second swing arms are respectively connected to the two ends of the second pressing roller, and the other end of the two second swing arms are respectively connected to the two ends of the embossing shaft.

10. The packaging bag printing and conveying device according to claim 9, characterized in that: There are two air suction plates, and correspondingly, there are two fans. The two air suction plates are arranged parallel to each other at the top and bottom of one side of the frame, and the two fans are arranged on the other side of the frame corresponding to the two air suction plates, and the two fans are connected to the corresponding air suction plates respectively.

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