A cutting device for cutting a fixed length of grey board

Abstract

The utility model provides a cutting device for fixed length cutting of grey bottom white board paper belongs to packing board cutting equipment technical field. The utility model embodiment provides the cutting device for fixed length cutting of grey bottom white board paper, through the rotation setting of multiple conveying rollers and multiple compression rollers capable of conveying grey bottom white board paper to cutting table on rack component, when the grey bottom white board paper reaches the predetermined length size on moving to cutting table, the flattening assembly moves down and presses the grey bottom white board paper flatly on cutting table, and cutting assembly carries out cutting to the grey bottom white board paper on cutting table. In this process, because the cooperation of multiple conveying rollers and multiple compression rollers can play the role of tensioning and roller pressing to the grey bottom white board paper, the grey bottom white board paper is not prone to flexion deformation. Moreover, through the flattening assembly cooperation cutting table to the grey bottom white board paper on cutting table play the role of flattening and pressing hold positioning, effectively prevent the flexion deformation phenomenon of the grey bottom white board paper after cutting, improve cutting accuracy.

Description

Technical Field

[0001] This utility model belongs to the technical field of packaging paperboard cutting equipment, and in particular, relates to a cutting device for cutting gray-backed white cardboard to a fixed length. Background Technology

[0002] Gray-backed white cardboard has a gray base and a white coated front, falling under the category of packaging paperboard. It is a processed paperboard made by coating a base paperboard with white paint and then finishing the process. During the production of gray-backed white cardboard, a cutting device is used to cut the rolled-up paperboard into rectangular pieces of predetermined lengths. Currently, when cutting gray-backed white cardboard, the unwound paperboard is prone to buckling and deformation, which not only reduces the cutting accuracy but also causes buckling and deformation in the cut paperboard, resulting in the rectangular pieces of gray-backed white cardboard not maintaining a good flatness. Utility Model Content

[0003] Based on the above-mentioned problems in the prior art, the purpose of this utility model embodiment is to provide a cutting device for cutting gray-backed white cardboard at a fixed length, so as to solve the technical problem that in the prior art, when cutting gray-backed white cardboard, the unwound gray-backed white cardboard is prone to buckling and deformation, which not only reduces the cutting accuracy, but also causes the cut cardboard to have buckling and deformation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cutting device for cutting gray-backed white cardboard to a fixed length, comprising: The frame assembly includes a frame body, multiple support legs supporting the frame body, and an unwinding shaft for unwinding a roll of gray-backed white cardboard paper, the unwinding shaft being rotatably mounted on the frame body. A cutting table is mounted on the frame body; A conveying assembly is used to convey unwound gray-backed white cardboard to the cutting table. The conveying assembly includes multiple conveying rollers rotatably mounted on the frame body, multiple pressure rollers rotatably mounted on the frame body and located above the conveying rollers, and a drive motor for driving the conveying rollers to rotate. The pressure rollers are arranged in a one-to-one correspondence with the conveying rollers. The distance between two adjacent conveying rollers is equal, and the distance between two adjacent pressure rollers is equal. Each pressure roller and the corresponding conveying roller have a transmission gap for the gray-backed white cardboard to pass through. The distance of the transmission gap is equal to the thickness of the gray-backed white cardboard. A cutting mechanism is used to cut the gray-backed white cardboard paper that is conveyed to the cutting table. The cutting mechanism is disposed on the frame body at a position corresponding to the cutting table. A meter counter is used to measure the length of the gray-backed white cardboard paper conveyed to the cutting table, enabling the cutting mechanism to cut the gray-backed white cardboard paper to a fixed length; and A flattening component is used to press the gray-backed white cardboard flat onto the cutting table when the cutting mechanism cuts the gray-backed white cardboard. The flattening component is movably disposed on the frame body above the cutting table.

[0005] Furthermore, the cutting mechanism includes a knife holder capable of reciprocating along a direction perpendicular to the transport direction of the gray-backed white cardboard, a first cylinder for driving the knife holder to move, and a cutter disposed on the knife holder. The frame body is provided with a guide groove for guiding the cutter to reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard. The cutter is slidably inserted into the guide groove, and the first cylinder is fixedly disposed on the frame body.

[0006] Furthermore, the cutting mechanism also includes multiple guide rods that guide the knife holder to move in a direction perpendicular to the transport direction of the gray-backed white cardboard. The multiple guide rods are fixedly arranged on the frame body in parallel and at intervals. The knife holder is provided with a first guide sliding hole corresponding to the position of each guide rod, and each guide rod is slidably inserted into the corresponding first guide sliding hole.

[0007] Furthermore, the flattening assembly includes a bracket disposed on the frame body, a second cylinder fixedly disposed on the bracket, and a pressing member disposed on the telescopic rod of the second cylinder.

[0008] Furthermore, the pressing member has a closed negative pressure chamber inside, and the pressing member has multiple adsorption holes on the side facing the cutting table. The pressing member is provided with a pipe joint for connecting to the gas supply pipe of the vacuum pump.

[0009] Furthermore, the cutting table has a connecting part at one end near the conveying roller for guiding the gray-backed white cardboard paper to the cutting table, and the top surface of the connecting part is flush with the conveying plane of the conveying roller.

[0010] Furthermore, the cutting table and / or the connecting part are provided with two stop strips for stopping the corresponding sides of the gray-backed white cardboard, and a limiting groove is formed between the two stop strips to limit the gray-backed white cardboard and prevent the gray-backed white cardboard from deflecting.

[0011] Furthermore, the conveying assembly also includes a first synchronous pulley fixedly mounted on one end of each of the conveying rollers, a second synchronous pulley fixedly mounted on the motor shaft of the drive motor, and a first synchronous belt that drives the first synchronous pulley and the second synchronous pulley. The drive motor is fixedly mounted on the frame body via a motor mount.

[0012] Furthermore, the conveying assembly also includes a third synchronous pulley fixedly fitted to one end of each of the pressure rollers, and a second synchronous belt drivingly connecting each of the third synchronous pulleys.

[0013] Furthermore, the cutting mechanism is located between the flattening assembly and the conveying assembly.

[0014] Compared with the prior art, one or more technical solutions in the embodiments of this utility model have at least one of the following beneficial effects: The cutting device for cutting grey-backed white cardboard to a fixed length according to this utility model embodiment uses multiple conveying rollers and multiple pressure rollers rotatably arranged on a frame assembly. Each pressure roller has a transmission gap between it and the corresponding conveying roller to allow the grey-backed white cardboard to pass through. By simply driving the conveying rollers to rotate via a drive motor, the friction between the roller surface and the grey-backed white cardboard allows the paper to be conveyed along the conveying surface formed by the multiple conveying rollers to the cutting table. When the grey-backed white cardboard reaches the predetermined length on the cutting table, the flattening component moves down and presses the paper flat onto the cutting table, while the cutting component cuts the paper. During this process, the cooperation of the multiple conveying rollers and multiple pressure rollers provides tension and roll forming for the grey-backed white cardboard, making it less prone to buckling deformation. Furthermore, the flattening component flattens and holds the gray-backed white cardboard on the cutting table, effectively preventing the gray-backed white cardboard from buckling and deforming after cutting, and improving cutting accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A three-dimensional structural schematic diagram of the cutting device for cutting gray-backed white cardboard to a fixed length provided by this utility model; Figure 2 Another three-dimensional structural schematic diagram of the cutting device for cutting gray-backed white cardboard at a fixed length provided by this utility model; Figure 3 for Figure 2 A cross-sectional view of the cutting device for cutting gray-backed white cardboard to a fixed length, as shown in the figure. Figure 4 A three-dimensional structural diagram of the conveying assembly provided by this utility model; Figure 5 Assembly drawing of the frame assembly and cutting mechanism provided by this utility model; Figure 6 A three-dimensional structural diagram of the frame body provided by this utility model; Figure 7 A three-dimensional structural schematic diagram of the cutting mechanism provided by this utility model; Figure 8 A three-dimensional structural diagram of the flattening component provided by this utility model.

[0017] The following are the labeling elements in the figure: 1-Frame assembly; 11-Frame body; 111-Guide groove; 12-Support leg; 13-Unwinding shaft; 2-Cutting table; 21-Connecting part; 22-Stop strip; 3-Conveying assembly; 31-Conveying roller; 32-Pressure roller; 33-Drive motor; 34-First synchronous pulley; 35-Second synchronous pulley; 36-First synchronous belt; 37-Third synchronous pulley; 38-Second synchronous belt; 4-Cutting mechanism; 41-Knife holder; 411-First guide slide hole; 42-First cylinder; 43-Cutter; 44-Guide rod; 5-Flattening assembly; 51-Bracket; 52-Second cylinder; 53-Pressure component; 531-Adsorption hole; 532-Pipe connector; 533-Negative pressure chamber; 54-Guide column. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "attached" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0021] Please refer to the following: Figures 1 to 8 The cutting device for cutting gray-backed white cardboard to a fixed length, as provided in this embodiment of the present invention, will now be described. Please refer to the following for further details. Figure 1 , Figure 2 , Figure 3 and Figure 4The cutting device for cutting gray-backed white cardboard at a fixed length provided in this embodiment of the utility model includes a frame assembly 1, a cutting table 2, a conveying assembly 3, a cutting mechanism 4, a meter counter and a flattening assembly 5. The frame assembly 1 includes a frame body 11, a plurality of support legs 12 supporting the frame body 11 and a unwinding shaft 13 for unwinding the gray-backed white cardboard roll 6. The unwinding shaft 13 is rotatably mounted on the frame body 11. A cutting table 2 is mounted on the frame body 11. A conveying assembly 3 is used to convey the unwound gray-backed white cardboard to the cutting table 2. The conveying assembly 3 includes multiple conveying rollers 31 rotatably mounted on the frame body 11, multiple pressure rollers 32 rotatably mounted on the frame body 11 and located above the conveying rollers 31, and a drive motor 33 for driving the conveying rollers 31 to rotate. The pressure rollers 32 are arranged one-to-one with the conveying rollers 31. The distance between two adjacent conveying rollers 31 is equal, and the distance between two adjacent pressure rollers 32 is equal. There is a transmission gap between each pressure roller 32 and the corresponding conveying roller 31 for the gray-backed white cardboard to pass through. The distance of the transmission gap is equal to the thickness of the gray-backed white cardboard. A cutting mechanism 4 is mounted on the frame body 11 at a position corresponding to the cutting table 2. The cutting mechanism 4 is used to cut the gray-backed white cardboard conveyed to the cutting table 2. A meter counter is used to measure the length of the gray-backed white cardboard conveyed to the cutting table 2, so that the cutting mechanism 4 can cut the gray-backed white cardboard to a fixed length. It should be noted that the meter counter is implemented using existing technology. The flattening component 5 is movably mounted on the frame body 11 above the cutting table 2. The flattening component 5 is used to press the gray-backed white cardboard flat onto the cutting table 2 when the cutting mechanism 4 cuts the gray-backed white cardboard, so as to avoid the gray-backed white cardboard from buckling and deforming.

[0022] When the cutting device for cutting gray-backed white cardboard of fixed length provided in this embodiment of the utility model is working, it is only necessary to place the gray-backed white cardboard roll 6 on the unwinding shaft 13, and drive the conveying roller 31 to rotate by the drive motor 33. Since the gray-backed white cardboard is pressed on the conveying roller 31 by the pressure roller 32, the gray-backed white cardboard can be moved along the conveying surface composed of multiple conveying rollers 31 towards the cutting table 2 by the friction between the roller surface of the conveying roller 31 and the gray-backed white cardboard. The length of the gray-backed white cardboard that has moved to the cutting table 2 is measured by the meter counter. When the gray-backed white cardboard that has moved to the cutting table 2 reaches the predetermined length, the meter counter feeds the information back to the controller. The controller controls the flattening component 5 to move down and press the gray-backed white cardboard flat on the cutting table 2. At the same time, the controller controls the cutting component to cut the gray-backed white cardboard on the cutting table 2. As multiple conveying rollers 31 work in conjunction with multiple pressure rollers 32 to convey the gray-backed white cardboard, they can stretch and roll-press the gray-backed white cardboard, making it less prone to buckling and deformation. In addition, the flattening component 5, together with the cutting table 2, flattens and holds the gray-backed white cardboard that has been removed from the conveying component 3, which can effectively prevent the gray-backed white cardboard from buckling and deformation after cutting, and improve the cutting accuracy.

[0023] Please refer to the following: Figure 3 , Figure 5 and Figure 7 In some embodiments, the cutting mechanism 4 includes a knife holder 41 capable of reciprocating along a direction perpendicular to the transport direction of the gray-backed white cardboard, a first cylinder 42 driving the knife holder 41 to move, and a cutter 43 disposed on the knife holder 41. The frame body 11 is provided with a guide groove 111 for guiding the cutter 43 to reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard. The cutter 43 is slidably inserted into the guide groove 111, and the first cylinder 42 is fixedly disposed on the frame body 11. In this embodiment, the first cylinder 42 drives the knife holder 41 to reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard (the thickness direction of the gray-backed white cardboard), and the knife holder 41 can then drive the cutter 43 to reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard (the thickness direction of the gray-backed white cardboard), thereby enabling the cutter 43 to cut the gray-backed white cardboard conveyed to the cutting table 2. In addition, the guide groove 111 on the frame body 11 guides the movement of the cutter 43, which can prevent the cutter 43 from shifting position during the cutting process, thereby improving the cutting accuracy.

[0024] Please refer to the following: Figure 5 and Figure 7 In some embodiments, the cutting mechanism 4 further includes multiple guide rods 44 that guide the blade holder 41 to move in a direction perpendicular to the transport direction of the gray-backed white cardboard paper. The multiple guide rods 44 are fixedly mounted parallel to each other and spaced apart on the frame body 11. The blade holder 41 is provided with first guide sliding holes 411 corresponding to the positions of each guide rod 44, and each guide rod 44 is slidably inserted into the corresponding first guide sliding hole 411. In this embodiment, the sliding cooperation between the multiple guide rods 44 and the multiple first guide sliding holes 411 guides the blade holder 41 to move in a direction perpendicular to the transport direction of the gray-backed white cardboard paper, further preventing the cutter 43 from shifting position during the cutting process, thereby improving cutting accuracy.

[0025] Please refer to the following: Figure 1 , Figure 5 and Figure 8In some embodiments, the flattening assembly 5 includes a bracket 51 mounted on the frame body 11, a second cylinder 52 fixedly mounted on the bracket 51, and a pressing member 53 mounted on the telescopic rod of the second cylinder 52. In this embodiment, the second cylinder 52 can drive the pressing member 53 to move closer to or away from the cutting table 2. When the cutting mechanism 4 cuts the gray-backed white cardboard, the second cylinder 52 drives the pressing member 53 to move closer to the cutting table 2, and the pressing member 53 flattens the gray-backed white cardboard onto the cutting table 2. On the one hand, this can achieve positioning of the gray-backed white cardboard, preventing the gray-backed white cardboard from shifting position during the cutting process and reducing cutting accuracy; on the other hand, it can flatten the gray-backed white cardboard on the cutting table 2, effectively preventing the gray-backed white cardboard from buckling and deforming after cutting. It should be noted that the side of the pressing member 53 facing the cutting platform is the pressing plane, and a rubber layer or silicone layer can be provided on the pressing plane to increase friction and provide a cushioning effect.

[0026] Please refer to the following: Figure 2 , Figure 6 and Figure 8 In some embodiments, the flattening assembly 5 further includes at least two guide posts 54 that guide the pressing member 53 to move in a direction perpendicular to the transport direction of the gray-backed white cardboard. The at least two guide posts 54 are fixedly disposed parallel to and spaced apart on the pressing member 53. A second guide sliding hole 511 is provided on the bracket 51 corresponding to the position of each guide post 54, and each guide post 54 is slidably inserted into the corresponding second guide sliding hole 511. In this embodiment, through the sliding engagement of at least two guide posts 54 with multiple second guide sliding holes 511, the pressing member 53 can be guided to move in a direction perpendicular to the transport direction of the gray-backed white cardboard, further preventing the pressing member 53 from shifting position during the pressing process.

[0027] Please refer to the following: Figure 3 In some embodiments, the pressing member 53 has a closed negative pressure chamber 533 inside, and the side of the pressing member 53 facing the cutting table 2 has multiple adsorption holes 531. The pressing member 53 has a pipe connector 532 for connecting to the gas supply pipe of the vacuum pump. The adsorption holes 531 and the pipe connector 532 are respectively connected to the negative pressure chamber 533. In this embodiment, after the cutting mechanism 4 cuts the gray-backed white cardboard on the cutting table 2, the vacuum pump evacuates the negative pressure chamber 533 of the pressing member 53, so that a negative pressure is formed in the negative pressure chamber 533. This allows the adsorption holes 531 on the pressing member 53 to adsorb the paper. At this time, the second cylinder 52 drives the pressing member 53 away from the cutting table 2, so that the cut gray-backed white cardboard can be removed by the pressing member 53. This avoids the cut gray-backed white cardboard from hindering and drying the gray-backed white cardboard subsequently conveyed to the cutting table 2 by the conveying component 3, thereby improving the cutting efficiency.

[0028] Please refer to the following: Figure 1 , Figure 3 and Figure 6 In some embodiments, the cutting table 2 has a connecting portion 21 at one end near the conveying roller 31 for guiding the gray-backed white cardboard paper to the cutting table 2. The top surface of the connecting portion 21 is flush with the conveying plane of the conveying roller 31. In this embodiment, the connecting portion 21 guides the gray-backed white cardboard paper on the conveying roller 31 to the cutting table 2, ensuring the stable and reliable conveying of the gray-backed white cardboard paper to the cutting table 2.

[0029] Please refer to the following: Figure 1 , Figure 2 and Figure 6 In some embodiments, the cutting table 2 and / or the connecting part 21 are provided with two stop strips 22 for stopping the corresponding sides of the gray-backed white board paper. A limiting groove is formed between the two stop strips 22. The limiting groove can limit the movement path of the gray-backed white board paper to prevent the gray-backed white board paper from being obliquely conveyed to the cutting table 2 and affecting the cutting accuracy.

[0030] Please refer to the following: Figure 2 , Figure 3 and Figure 4 In some embodiments, the conveying assembly 3 further includes a first synchronous pulley 34 fixedly mounted on one end of each conveying roller 31, a second synchronous pulley 35 fixedly mounted on the motor shaft of the drive motor 33, and a first synchronous belt 36 drivingly connecting the first synchronous pulley 34 and the second synchronous pulley 35. The drive motor 33 is fixedly mounted on the frame body 11 via a motor mount. In this embodiment, when the drive motor 33 is started, under the transmission action of the first synchronous belt 36 and the first synchronous pulley 34 and the second synchronous pulley 35, the drive motor 33 can synchronously drive the multiple conveying rollers 31 to rotate synchronously, avoiding uneven rotation of the conveying rollers 31 that could cause wrinkles and scars on the gray-backed white cardboard during conveying.

[0031] Please refer to the following: Figure 2 , Figure 3 and Figure 4 In some embodiments, the conveying assembly 3 further includes a third synchronous pulley 37 fixedly fitted to one end of each pressure roller 32, and a second synchronous belt 38 drivingly connecting each third synchronous pulley 37. In this embodiment, the second synchronous belt 38 drivingly connecting each third synchronous pulley 37 enables the multiple pressure rollers 32 to rotate synchronously, ensuring that the gray-backed white cardboard is subjected to balanced force during conveying, effectively preventing wrinkles and scars on the gray-backed white cardboard due to uneven force during conveying. Please refer to the following: Figure 1 , Figure 2 and Figure 3In some embodiments, the cutting mechanism 4 is located between the flattening component 5 and the conveying component 3. The flattening component 5 and the conveying component 3 play a role in positioning and stretching the gray-backed white cardboard, which is conducive to the cutting mechanism 4 cutting the gray-backed white cardboard quickly.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cutting device for cutting gray-backed white cardboard to a fixed length, characterized in that, include: The frame assembly includes a frame body, multiple support legs supporting the frame body, and an unwinding shaft for unwinding a roll of gray-backed white cardboard, the unwinding shaft being rotatably mounted on the frame body. A cutting table is mounted on the frame body; A conveying assembly is used to convey unwound gray-backed white cardboard to the cutting table. The conveying assembly includes multiple conveying rollers rotatably mounted on the frame body, multiple pressure rollers rotatably mounted on the frame body and located above the conveying rollers, and a drive motor for driving the conveying rollers to rotate. The pressure rollers are arranged in a one-to-one correspondence with the conveying rollers. The distance between two adjacent conveying rollers is equal, and the distance between two adjacent pressure rollers is equal. Each pressure roller and the corresponding conveying roller have a transmission gap for the gray-backed white cardboard to pass through. The distance of the transmission gap is equal to the thickness of the gray-backed white cardboard. A cutting mechanism is used to cut the gray-backed white cardboard paper that is conveyed to the cutting table. The cutting mechanism is disposed on the frame body at a position corresponding to the cutting table. A meter counter is used to measure the length of the gray-backed white cardboard paper conveyed to the cutting table, so that the cutting mechanism can cut the gray-backed white cardboard paper to a fixed length. as well as A flattening component is used to press the gray-backed white cardboard flat onto the cutting table when the cutting mechanism cuts the gray-backed white cardboard. The flattening component is movably disposed on the frame body above the cutting table.

2. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 1, characterized in that, The cutting mechanism includes a knife holder that can reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard, a first cylinder that drives the knife holder to move, and a cutter disposed on the knife holder. The frame body is provided with a guide groove that guides the cutter to reciprocate along a direction perpendicular to the transport direction of the gray-backed white cardboard. The cutter is slidably inserted into the guide groove. The first cylinder is fixedly disposed on the frame body.

3. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 2, characterized in that, The cutting mechanism further includes multiple guide rods that guide the knife holder to move in a direction perpendicular to the transport direction of the gray-backed white cardboard. The multiple guide rods are fixedly arranged parallel to each other and spaced apart on the frame body. The knife holder is provided with a first guide sliding hole corresponding to the position of each guide rod, and each guide rod is slidably inserted into the corresponding first guide sliding hole.

4. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 1, characterized in that, The flattening assembly includes a bracket mounted on the frame body, a second cylinder fixedly mounted on the bracket, and a pressing member mounted on the telescopic rod of the second cylinder.

5. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 4, characterized in that, The pressing member has a closed negative pressure chamber inside, and multiple adsorption holes are provided on the side of the pressing member facing the cutting table. The pressing member is provided with a pipe joint for connecting to the gas supply pipe of the vacuum pump.

6. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 1, characterized in that, The cutting table is provided with a connecting part at one end near the conveying roller for guiding gray-backed white cardboard paper to the cutting table. The top surface of the connecting part is flush with the conveying plane of the conveying roller.

7. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 6, characterized in that, The cutting table and / or the connecting part are provided with two stop strips for stopping the corresponding sides of the gray-backed white board paper, and a limiting groove is formed between the two stop strips to limit the gray-backed white board paper and prevent the gray-backed white board paper from deflecting.

8. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 1, characterized in that, The conveying assembly further includes a first synchronous pulley fixedly mounted on one end of each of the conveying rollers, a second synchronous pulley fixedly mounted on the motor shaft of the drive motor, and a first synchronous belt that drives the first synchronous pulley and the second synchronous pulley. The drive motor is fixedly mounted on the frame body via a motor mount.

9. The cutting device for cutting gray-backed white cardboard to a fixed length as described in claim 1, characterized in that, The conveying assembly also includes a third synchronous pulley fixedly fitted to one end of each of the pressure rollers, and a second synchronous belt that drives and connects each of the third synchronous pulleys.

10. The cutting device for cutting gray-backed white cardboard to a fixed length as described in any one of claims 1 to 9, characterized in that, The cutting mechanism is located between the flattening assembly and the conveying assembly.

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