Split double-sided single-color printing machine

Abstract

The invention relates to the technical field of printing equipment, and provides an oppositely-opened double-face single-color printing machine which comprises a printing machine body, a drying and overturning part is arranged on the printing machine body and comprises a base, a drying and conveying mechanism and an overturning mechanism, and a plurality of lifting rails are fixedly installed on the base; the multiple drying and conveying mechanisms are vertically and fixedly connected, paper is conveyed to the drying and conveying mechanisms after being printed, the drying and conveying mechanisms are used for drying and conveying the paper, the turnover mechanism is arranged on the side of the drying and conveying mechanisms and used for turning over the paper, and the conveying assembly can make contact with the paper. By means of the technical scheme, the technical problems that in the prior art, when drying is conducted after printing is conducted in a split double-sided printing machine, the equipment is too large and is prone to being smeared due to the fact that drying is conducted through long-distance conveying are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of printing equipment, and in particular, to a sheet-fed double-sided single-color printing press. Background Art

[0002] A sheet-fed double-sided single-color printing press is a lithographic offset printing device that can efficiently complete single-color printing on both sides of a paper. It is mainly applied to fields that require double-sided printing, such as books, magazines, and brochures. In the printing press, the paper is printed by a cylinder. The paper is transported to the cylinder, and after the inking device inks the cylinder, the paper is printed. Then, the ink on the paper is dried by a drying and turning part, and the paper is turned over. The reversed paper is then transported back into the printing unit for reverse printing.

[0003] Currently, offset printing inks are mostly used for printing paper. The ink can be dried by infrared drying or air drying, but drying usually takes 10 to 30 seconds, and reverse printing can only be carried out after the ink on one side is dry. In conventional printing equipment, the drying is usually achieved by lengthening the paper transportation distance so that the paper is dried during transportation. However, this makes the transportation device bulky, and the printed part of the paper may be smeared during transportation, thereby affecting the printing effect. Therefore, the traditional method of drying during long-distance transportation has problems of large size and easy smearing, and the drying and turning part in the printing press can be improved. Summary of the Invention

[0004] To overcome the above defects, embodiments of the present disclosure provide a sheet-fed double-sided single-color printing press, which solves the technical problems that in the related art, when drying after printing in a sheet-fed double-sided printing press, the method of drying through long-distance transportation will cause the equipment to be too large and prone to smearing.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a sheet-fed double-sided single-color printing press. A drying and turning part is provided on the printing press. The drying and turning part includes a base, a drying and conveying mechanism, and a turning mechanism. The base is fixedly installed on the printing press. A plurality of lifting tracks are fixedly installed on the base. A plurality of drying and conveying mechanisms are provided. The plurality of drying and conveying mechanisms are vertically fixedly connected. The drying and conveying mechanisms are slidably arranged on the lifting tracks. After the paper is printed, it is transported onto the drying and conveying mechanisms. The drying and conveying mechanisms are used for drying and transporting the paper. The turning mechanism is fixedly connected to the base. The turning mechanism is arranged on the side of the drying and conveying mechanisms. The turning mechanism is used for turning over the paper. A conveying component is provided in the drying and conveying mechanisms. The conveying component can contact the paper. When the paper is dried, a gap is left between the conveying component and the paper.

[0006] The drying and conveying mechanism also includes a bottom frame, a driving cylinder 1 and a drying cover. A track bar is fixedly connected to the side of the bottom frame, and the track bar is slidably connected to the lifting track. A plurality of driving cylinders 1 are provided, and the plurality of driving cylinders 1 are fixedly installed inside the bottom frame. The drying cover is slidably arranged above the bottom frame, and the output end of the driving cylinder 1 is fixedly connected to the drying cover. A plurality of strip conveying grooves are provided on the drying cover, and the strip conveying grooves are slidably connected to the conveying assembly. A ventilation net is provided above the drying cover, and a ventilation net is also provided on the side of the strip conveying groove.

[0007] The conveying assembly includes a conveying frame, a tensioning wheel and a motor 1. There are multiple conveying frames, and the multiple conveying frames are fixedly installed on the bottom frame. The conveying frames slide and extend into the strip conveying groove. There are multiple tensioning wheels. The conveying frame is rotatably connected to the multiple tensioning wheels, and each of the multiple tensioning wheels on the conveying frame is tensioned with a conveyor belt. The motor 1 is fixedly installed on the bottom frame, and a transmission rod is fixedly connected to the output end of the motor 1. The transmission rod passes through the multiple conveying frames and is fixedly connected to the tensioning wheels on the multiple conveying frames.

[0008] A plurality of heating wires are fixedly connected in the drying cover, and the plurality of heating wires are staggered with the plurality of strip conveying grooves; a plurality of ventilation components are fixedly connected to the bottom frame, and the plurality of ventilation components are staggered with the plurality of conveying racks, and the ventilation components correspond to the heating wires.

[0009] The ventilation component includes an air distribution frame, a fan and an air outlet. The air distribution frame is fixedly connected to the bottom frame. A plurality of air guide plates are arranged on the air distribution frame. The fan is fixedly installed on a side of the air distribution frame close to the bottom frame. The air outlet is opened on the bottom frame. The air outlet corresponds to the fan. When the output end of the driving cylinder 1 is shortened, the drying cover approaches the bottom frame, and the conveyor belt moves in the strip conveyor groove. When the conveyor belt moves above the ventilation net, the conveyor belt contacts the paper.

[0010] A plurality of driving cylinders 2 are fixedly arranged on the base, and the output end of the driving cylinder 2 is fixedly connected to the track bar in the drying conveying mechanism located at the top among the plurality of the drying conveying mechanisms. The output end of the driving cylinder 2 can drive the plurality of the drying conveying mechanisms to slide on the lifting track.

[0011] The flipping mechanism includes a flipping frame, a second motor, and a transfer rubber wheel. The flipping frame is fixedly connected to the base. A paper-changing opening is formed on the side of the flipping frame. The second motor is fixedly installed on the flipping frame. The transfer rubber wheel is rotatably arranged in the flipping frame and is in transmission connection with the output end of the second motor. After the output end of the second driving cylinder is shortened, the ventilation net in the uppermost drying and conveying mechanism among the plurality of drying and conveying mechanisms corresponds to the paper-changing opening.

[0012] The beneficial effects of the embodiments of the present disclosure are as follows: 1. In the present invention, by providing a ventilation net and a strip-shaped conveying groove, the ventilation net supports and dries the paper at the same time. After the drying is completed, the paper is conveyed by the movement of the conveying rack in the strip-shaped conveying groove. By drying the paper in the adsorbed state, it is possible to avoid the paper being smeared during the drying and conveying processes. 2. In the present invention, by providing the second driving cylinder, it can drive a plurality of bottom frames to rise and fall. Through the cyclic use of the plurality of drying and conveying mechanisms, a plurality of papers can be cyclically dried, so that while maintaining the drying of the paper for a certain period of time, the volume of the drying and conveying part can also be reduced. 3. In the present invention, by providing a plurality of drying and conveying mechanisms, a plurality of papers can be sequentially dried through the reciprocating movement of the plurality of drying and conveying mechanisms. At the same time, by adsorbing and fixing the paper on the drying and conveying mechanism and drying it at the same time, it is possible to avoid the paper being smeared. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description in the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the exemplary embodiments of the present disclosure and these drawings.

[0014] Figure 1 It is a schematic structural diagram of the whole in the present invention; Figure 2 It is a schematic structural diagram of the whole from another perspective in the present invention; Figure 3 It is a partial structural schematic diagram of the cooperation between the conveying assembly and the drying cover in the present invention; Figure 4 It is an internal sectional structural schematic diagram of the drying cover in the present invention; Figure 5 It is a structural schematic diagram of the cooperation between the conveying assembly and the ventilation assembly in the present invention; Figure 6 It is a structural schematic diagram of the cooperation between the heating wire and the strip-shaped conveying groove in the present invention; Figure 7 This is a schematic diagram of the partial internal sectional structure of the flipping frame in the present invention.

[0015] In the figure: 1, base; 2, lifting track; 3, bottom frame; 4, track bar; 5, first driving cylinder; 6, drying cover; 7, strip-shaped conveying groove; 8, ventilation net; 9, conveying rack; 10, tensioning wheel; 11, conveyor belt; 12, first motor; 13, transmission rod; 14, heating wire; 15, air distribution frame; 16, fan; 17, air outlet; 18, second driving cylinder; 19, flipping frame; 20, paper changing port; 21, second motor; 22, glue transfer wheel. Detailed implementation manners

[0016] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than limiting the present disclosure.

[0017] For the sake of simplicity of the drawings, only the parts related to the disclosure are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0018] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0019] In the present disclosure, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature is at a lower horizontal height than the second feature.

[0020] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure.

[0021] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0022] As Figures 1 to 7 shown, it shows a double-sided single-color printing press in an embodiment of the present disclosure. A drying and flipping part is provided on the printing press. The drying and flipping part includes a base 1, a drying and conveying mechanism, and a flipping mechanism. The base 1 is fixedly installed on the printing press. A plurality of lifting rails 2 are fixedly installed on the base 1. A plurality of drying and conveying mechanisms are provided. The plurality of drying and conveying mechanisms are vertically fixedly connected. The drying and conveying mechanisms are slidably arranged on the lifting rails 2. After the paper is printed, it is conveyed onto the drying and conveying mechanisms. The drying and conveying mechanisms are used for drying and conveying the paper. The flipping mechanism is fixedly connected to the base 1. The flipping mechanism is arranged on the side of the drying and conveying mechanisms. The flipping mechanism is used for turning over the paper. A conveying component is provided in the drying and conveying mechanisms. The conveying component can contact the paper. When the paper is dried, there is a gap between the conveying component and the paper. During printing, after the paper is printed on one side, it is conveyed onto the drying and conveying mechanisms. The paper is dried on the drying and conveying mechanisms. At the same time, through vertical sliding, another drying and conveying mechanism is aligned with the output position of the paper. The paper is conveyed onto another drying and conveying mechanism. When the paper is dried, the paper is conveyed into the flipping mechanism by the conveying component, turned over, and then conveyed onto the drying and conveying mechanisms. At this time, the turned-over paper is aligned with the printing part on the printing press. After the paper is turned over, the conveying component conveys the turned-over paper into the printing part again for reverse side printing to complete double-sided printing. By moving a plurality of drying and conveying mechanisms, multiple papers can be dried simultaneously. After the papers are dried, they are turned over, avoiding smudging during the continuous movement of the papers.

[0023] As Figures 1 to 6As shown in the figure, the drying and conveying mechanism further includes a bottom frame 3, a first driving cylinder 5 and a drying cover 6. A track bar 4 is fixedly connected to the side of the bottom frame 3, and the track bar 4 is slidably connected to the lifting track 2. A plurality of first driving cylinders 5 are provided, and the plurality of first driving cylinders 5 are fixedly installed inside the bottom frame 3. The drying cover 6 is slidably arranged above the bottom frame 3, and the output end of the first driving cylinder 5 is fixedly connected to the drying cover 6. A plurality of strip-shaped conveying grooves 7 are formed in the drying cover 6, and the strip-shaped conveying grooves 7 are slidably connected to the conveying assembly. An air ventilation net 8 is arranged above the drying cover 6, and an air ventilation net 8 is also arranged on the side of the strip-shaped conveying groove 7. The distance between the drying cover 6 and the bottom frame 3 can be adjusted by the driving cylinder. When the distance between the drying cover 6 and the bottom frame 3 becomes farther, the air ventilation net 8 supports the paper. When the paper drying is completed, by pulling the drying cover 6 downward, the conveying assembly is exposed upward in the strip-shaped conveying groove 7. At this time, the paper can be driven to move by the conveyor belt 11, and through the air ventilation net 8 on the side of the strip-shaped conveying groove 7, the paper is evenly dried.

[0024] As Figures 3 to 6 shown in the figure, the conveying assembly includes a conveying frame 9, a tensioning wheel 10 and a first motor 12. A plurality of conveying frames 9 are provided, and the plurality of conveying frames 9 are fixedly installed on the bottom frame 3. The conveying frames 9 slidably extend into the strip-shaped conveying grooves 7. A plurality of tensioning wheels 10 are provided, and a plurality of tensioning wheels 10 are rotatably connected to the conveying frames 9. A conveyor belt 11 is tensioned and sleeved on the plurality of tensioning wheels 10 on each conveying frame 9. The first motor 12 is fixedly installed in the bottom frame 3, and a transmission rod 13 is fixedly connected to the output end of the first motor 12. The transmission rod 13 penetrates through the plurality of conveying frames 9 and is fixedly connected to the tensioning wheels 10 on the plurality of conveying frames 9. In this embodiment, four strip-shaped conveying grooves 7 are provided, and four conveying assemblies are also provided. On the conveying frame 9, the conveyor belt 11 is driven to move at the same speed by the output end of the first motor 12. The conveyor belt 11 can move in two directions, driving the paper to move towards the flipping mechanism and the printing part respectively.

[0025] As Figures 4 to 6 shown in the figure, a plurality of heating wires 14 are fixedly connected in the drying cover 6, and the plurality of heating wires 14 are arranged in an alternating manner with the plurality of strip-shaped conveying grooves 7. A plurality of ventilation assemblies are fixedly connected to the bottom frame 3, and the plurality of ventilation assemblies are arranged in an alternating manner with the plurality of conveying frames 9. The ventilation assemblies correspond to the heating wires 14, and the heating wires 14 are arranged on the side close to the air ventilation net 8. During drying, the ventilation assemblies suck the paper, and the air flow moves towards the air outlet 17 through the air ventilation net 8. The paper is sucked on the air ventilation net 8, and the heating wires 14 and the air flow during suction dry the paper. After drying is completed, the fan 16 stops sucking or reduces the suction force, and the paper contacts the conveyor belt 11 and is conveyed to the paper replacement port 20 by the conveyor belt 11.

[0026] As Figure 4 and Figure 6As shown, the ventilation assembly includes an air distribution frame 15, a fan 16 and an air outlet 17. The air distribution frame 15 is fixedly connected to the bottom frame 3. A plurality of air guide plates are arranged in the air distribution frame 15. The fan 16 is fixedly installed on the side of the air distribution frame 15 close to the bottom frame 3. The air outlet 17 is opened on the bottom frame 3. The air outlet 17 corresponds to the fan 16. When the output end of the driving cylinder 5 is shortened, the drying cover 6 approaches the bottom frame 3, and the conveyor belt 11 moves in the strip conveyor trough 7. When the conveyor belt 11 moves above the ventilation net 8, the conveyor belt 1 1 is in contact with the paper. In this embodiment, ten wind balancing frames 15 are provided. The fan 16 sucks the paper through the wind balancing frames 15. The multiple air guide plates provided inside the wind balancing frames 15 make the flowing airflow relatively evenly distributed on the wind balancing frames 15, so that the force on each part of the paper is kept relatively even when sucking the paper, and the paper is prevented from being uneven during suction. The airflow generated by the fan 16 during suction is discharged through the air outlet 17, and the discharged airflow can be blown onto the paper on the drying conveying mechanism below, and can also accelerate the drying speed of the paper below.

[0027] like Figures 1 to 3 As shown, a plurality of driving cylinders 18 are fixedly arranged on the base 1, and the output end of the driving cylinder 18 is fixedly connected to the track bar 4 in the drying conveying mechanism located at the top among the multiple drying conveying mechanisms. The output end of the driving cylinder 18 can drive the multiple drying conveying mechanisms to slide on the lifting track 2, and the output end of the driving cylinder 18 can simultaneously push the three drying conveying mechanisms to perform longitudinal lifting movements.

[0028] like Figure 7 As shown, the flipping mechanism includes a flipping frame 19, a second motor 21 and a rubber rotating wheel 22. The flipping frame 19 is fixedly connected to the base 1. A paper changing port 20 is provided on the side of the flipping frame 19. The second motor 21 is fixedly installed on the flipping frame 19. The rubber rotating wheel 22 is rotatably arranged in the flipping frame 19. The rubber rotating wheel 22 is transmission-connected with the output end of the second motor 21. When the output end of the second driving cylinder 18 is shortened, the ventilation net 8 in the drying and conveying mechanism located at the top among the multiple drying and conveying mechanisms corresponds to the paper changing port 20. The cross-section of the flipping frame 19 is a 9-shape. After the paper enters through the paper changing port 20, it is driven by the rubber rotating wheel 22 to rotate inside the flipping frame 19. After the paper rotates, it moves in the opposite direction through the paper changing port 20.

[0029] In some examples, after the paper is printed, the paper is conveyed to the drying cover 6. At this time, the fan 16 starts to drive the air flow to move towards the air outlet 17 through the air distribution frame 15. The paper is sucked onto the surface of the ventilation net 8, and the heating wire 14 heats and dries the paper. The air flow can also prevent the paper from being burned by the high temperature of the heating wire 14. The air flow is discharged downward at the air outlet 17 to dry the paper below. After the paper is dried, the output end of the driving cylinder 5 shortens to pull the drying cover 6 downward, so that the conveyor belt 11 is exposed in the strip-shaped conveying groove 7 to contact a paper. The output end of the first motor 12 drives a plurality of tension wheels 10 to rotate through the transmission rod 13, and the plurality of conveyor belts 11 move at the same speed and in the same direction to drive the paper into the paper changing port 20. The output end of the second motor 21 drives the rubber transfer wheel 22 to rotate, so that the paper rotates in the flipping frame 19 and then moves onto the ventilation net 8. At this time, the output end of the first motor 12 reverses to drive the paper towards the printing part to print the reverse side of the paper. By driving the bottom frame 3 to rise and fall through the output end of the second driving cylinder 18, multiple papers can be respectively placed on multiple ventilation nets 8 for drying, and after the drying is completed, they are flipped in sequence and printed.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not intended to limit. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered within the scope of the claims of the present disclosure.

Claims

1. A double-sided single-color printing press, with a drying and turning unit provided on the printing press, characterized in that, The drying and flipping part includes: A base (1) fixedly installed on the printing machine, and a plurality of lifting tracks (2) are fixedly installed on the base (1); A plurality of drying and conveying mechanisms are provided, and the plurality of drying and conveying mechanisms are fixedly connected vertically. The drying and conveying mechanisms are slidably arranged on the lifting tracks (2). After the paper is printed, it is conveyed onto the drying and conveying mechanisms, and the drying and conveying mechanisms are used for drying and conveying the paper; A flipping mechanism fixedly connected to the base (1), the flipping mechanism is arranged on the side of the drying and conveying mechanism, and the flipping mechanism is used for turning over the paper; A conveying component is arranged in the drying and conveying mechanism, and the conveying component can contact the paper. When the paper is dried, a gap is left between the conveying component and the paper.

2. The perfecting double-sided single-color printing press according to claim 1, wherein The drying and conveying mechanism further includes: A bottom frame (3) fixedly connected with a track bar (4) on the side, and the track bar (4) is slidably connected with the lifting track (2); A plurality of driving cylinders I (5) are provided, and the plurality of driving cylinders I (5) are fixedly installed inside the bottom frame (3); A drying cover (6) is slidably arranged above the bottom frame (3), and the output end of the driving cylinder I (5) is fixedly connected with the drying cover (6).

3. The perfecting single-color printing press according to claim 2, wherein A plurality of strip-shaped conveying grooves (7) are formed in the drying cover (6), and the strip-shaped conveying grooves (7) are slidably connected with the conveying component. An air ventilation net (8) is arranged above the drying cover (6), and an air ventilation net (8) is also arranged on the side of the strip-shaped conveying grooves (7).

4. The perfecting single-color printing press according to claim 3, characterized in that, The conveying component includes: A plurality of conveying frames (9) are provided, and the plurality of conveying frames (9) are fixedly installed on the bottom frame (3), and the conveying frames (9) slidably extend into the strip-shaped conveying grooves (7); A plurality of tension wheels (10) are provided, and a plurality of the tension wheels (10) are rotatably connected to the conveying frames (9). A conveyor belt (11) is tensioned and sleeved on the plurality of tension wheels (10) on each conveying frame (9); A motor I (12) is fixedly installed in the bottom frame (3), and a transmission rod (13) is fixedly connected to the output end of the motor I (12). The transmission rod (13) penetrates through the plurality of conveying frames (9) and is fixedly connected with the tension wheels (10) on the plurality of conveying frames (9).

5. The perfecting double-sided single-color printing press according to claim 4, wherein A plurality of heating wires (14) are fixedly connected in the drying cover (6), and the plurality of heating wires (14) are arranged in a staggered manner with the plurality of strip-shaped conveying grooves (7). A plurality of ventilation components are fixedly connected to the bottom frame (3), and the plurality of ventilation components are arranged in a staggered manner with the plurality of conveying frames (9). The ventilation components correspond to the heating wires (14).

6. The perfecting single-color printing press according to claim 5, wherein, The ventilation component includes: An air equalizing frame (15) fixedly connected to the bottom frame (3), and a plurality of air guiding plates are arranged in the air equalizing frame (15); A blower (16) fixedly installed on one side of the air equalizing frame (15) close to the bottom frame (3); An air outlet (17) is formed in the bottom frame (3), and the air outlet (17) corresponds to the blower (16).

7. The perfecting single-color printing press according to claim 6, wherein, When the output end of the first driving cylinder (5) shortens, the drying cover (6) approaches the bottom frame (3), and the conveyor belt (11) moves in the strip-shaped conveying groove (7). When the conveyor belt (11) moves above the ventilation net (8), the conveyor belt (11) contacts the paper.

8. The perfector single-color printing press according to claim 7, characterized in that, A plurality of second driving cylinders (18) are fixedly arranged on the base (1). The output end of the second driving cylinder (18) is fixedly connected to the track bar (4) in the uppermost drying and conveying mechanism among the plurality of drying and conveying mechanisms. The output end of the second driving cylinder (18) can drive the plurality of drying and conveying mechanisms to slide on the lifting track (2).

9. The perfector single-color printing press according to claim 8, wherein, The turning mechanism includes: A turning frame (19) fixedly connected to the base (1), and a paper-changing opening (20) is formed on the side of the turning frame (19); A second motor (21) fixedly installed on the turning frame (19); A glue-transferring wheel (22) rotatably arranged in the turning frame (19), and the glue-transferring wheel (22) is in transmission connection with the output end of the second motor (21).

10. The perfecting double-sided single-color printing press according to claim 9, wherein After the output end of the second driving cylinder (18) shortens, the ventilation net (8) in the uppermost drying and conveying mechanism among the plurality of drying and conveying mechanisms corresponds to the paper-changing opening (20).

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