A preheating device for a corrugated board production line

Abstract

The utility model provides a corrugated board production line preheating device belongs to corrugated board production technical field, including bottom plate, the top fixedly connected with two opposite settings fixed plate of bottom plate, all are set up in the fixed plate and have the sliding slot one and the sliding slot two, the side of fixed plate mutual approach all are fixedly connected with the clamping block two between the sliding slot one and the sliding slot two, the clamping block two is set up and has the clamping groove two, the inside of clamping groove two is used for placing preheating cylinder. The utility model discloses through setting installation mechanism, can quickly preheating cylinder dismounts, has replaced the convenience to preheating cylinder, has improved the efficiency of preheating and production to corrugated board, through setting paper guide mechanism and adjusting mechanism, can adjust the distance of movable rod and preheating cylinder according to the thickness of different corrugated board, and when preheating cylinder is dismantled, will not cause movable rod and preheating cylinder distance too small and lead to preheating cylinder to be stuck by movable rod and be taken out inconveniently.

Description

Technical Field

[0001] This utility model relates to the field of corrugated cardboard production technology, and in particular to a preheating device for a corrugated cardboard production line. Background Technology

[0002] Preheating is a crucial step in the production of corrugated cardboard. It softens the linerboard and corrugated base paper by heating to facilitate subsequent forming and bonding. This improves fiber flowability, enhances the plasticity of the corrugated cardboard, and evaporates excess moisture from the cardboard to avoid adverse effects on the bonding effect, thus making the bond between the corrugated cardboard and the glue stronger.

[0003] Existing corrugated cardboard preheating devices require a preheating cylinder. After prolonged use, the preheating cylinder wears down, affecting the preheating effect on the corrugated cardboard and necessitating replacement. However, the installation and disassembly of the preheating cylinder are cumbersome. Furthermore, due to the varying thicknesses of different corrugated cardboards, the distance between the guide roller and the preheating cylinder is fixed and cannot be adjusted according to the thickness of the corrugated cardboard. Therefore, this application provides a preheating device for a corrugated cardboard production line to meet these requirements. Utility Model Content

[0004] The technical problem this utility model aims to solve is to provide a preheating device for a corrugated cardboard production line. This addresses the issue that existing preheating devices require a preheating cylinder, which wears down after prolonged use, affecting the preheating effect on the corrugated cardboard and necessitating replacement. However, the installation and disassembly of the preheating cylinder are cumbersome, and the distance between the guide roller and the preheating cylinder is fixed due to the varying thicknesses of different corrugated cardboards, making adjustment impossible based on the cardboard thickness.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A preheating device for a corrugated cardboard production line includes a base plate. Two opposing fixed plates are fixedly connected to the top of the base plate. Each fixed plate has a first groove and a second groove. A locking block is fixedly connected between the first and second grooves on the side of the fixed plates that are close to each other. The locking block has a locking groove, the interior of which is used to place a preheating cylinder. An installation mechanism for fixing the position of the preheating cylinder is installed between the fixed plates. The installation mechanism includes a connecting rod, the two ends of which pass through the first groove and are respectively connected to the connecting blocks on the different fixed plates. Connecting rod one is slidably connected to the slide groove one. Connecting rod two is fixedly connected to each of the connecting blocks on the side that is close to each other. The end of connecting rod two away from the connecting block passes through the slide groove two through the fixing plate and is fixedly connected to the fixing block. Connecting rod two and slide groove two are slidably connected. A snap-fit ​​block one that can be inserted into the snap-fit ​​groove two is fixedly connected to the side of the fixing block that is close to the snap-fit ​​block two. A snap-fit ​​groove one that is adapted to the preheating cylinder is opened on the side of the snap-fit ​​block one that is close to the snap-fit ​​block two. A telescopic rod is fixedly connected to the bottom of the connecting block. A cylinder with an output end fixedly connected to the telescopic rod is installed on the top of the base plate.

[0006] Preferably, each of the fixed plates has a through groove on one side that is close to the other. A sliding groove three is formed inside the through groove. A movable groove is formed on one side of the sliding groove three. A paper guiding mechanism is provided inside the sliding groove three. The paper guiding mechanism includes toothed blocks that can slide inside the sliding groove three. The same movable rod that passes through the through groove and penetrates the fixed plate is fixedly connected between the toothed blocks. The movable rod is slidably connected to the through groove.

[0007] Preferably, the fixed plate is equipped with an adjustment mechanism for adjusting the position of the movable rod. The adjustment mechanism includes a gear one located inside the movable groove, which meshes with the tooth block. A rotating shaft passing through the fixed plate is fixedly connected to the side of the gear one that is away from each other. Several serrations two arranged in a circumferential pattern around the rotating shaft are fixedly connected to the outer surface of the rotating shaft. A rack meshes with the serrations two. Several serrations three arranged in a circumferential pattern around the rack are fixedly connected to the outer wall of the rack. A turntable is fixedly connected to the end of the rotating shaft away from the gear one.

[0008] Preferably, a plurality of saw teeth are fixedly connected to the top of the connecting block, and the saw teeth can mesh with the saw teeth on the rack.

[0009] Preferably, each of the fixed plates is rotatably connected to an auxiliary gear on its opposite side, and the auxiliary gear is located inside the rack and meshes with the rack.

[0010] Preferably, an inclined slope is provided in the middle of the interior of the first slide and the second slide.

[0011] Compared with the prior art, this utility model has at least the following beneficial effects: In the above scheme, by setting up an installation mechanism, when the preheating cylinder shows signs of wear after prolonged use and needs to be removed and replaced, the cylinder is activated. The output end of the cylinder will drive the telescopic rod to move, and the connecting block at the top of the telescopic rod will be moved, allowing the second connecting rod to slide inside the second slide groove. The first connecting rod slides inside the first slide groove along with the connecting block to assist the second connecting rod in moving smoothly. When the second connecting rod slides, it will drive the first locking block to move out of the second locking groove through the fixing block, so that the first locking groove on the first locking block no longer abuts against the preheating cylinder. When the second connecting rod moves to the end of the second slide groove and the first locking block moves away from the preheating cylinder, the second connecting rod moves out of the second slide groove. When preheating the cylinder, both ends of the preheating cylinder can be pushed out directly into the second locking groove to complete the disassembly of the preheating cylinder. Then, the new preheating cylinder is placed inside the second locking groove, and the cylinder is reset. The connecting rod 2 is reset and moved by the telescopic rod and the connecting block. When the connecting rod 2 moves, it drives the fixing block to move the locking block 1 closer to the preheating cylinder. Finally, the locking groove 1 on the locking block 1 abuts against the preheating cylinder and cooperates with the second locking groove to lock the preheating cylinder, completing the installation. The advantage of this method is that the preheating cylinder can be quickly disassembled, which facilitates the replacement of the preheating cylinder and improves the efficiency of preheating and producing corrugated cardboard.

[0012] By setting up a paper guiding mechanism and an adjusting mechanism, when different corrugated cardboards need to be preheated, rotating the turntable drives the rotating shaft to rotate, causing gear one to rotate inside the movable groove under the influence of the rotating shaft. When gear one rotates, it drives the meshing tooth block to move inside the slide groove three. When the tooth block moves, the movable rod is also driven to move inside the through groove, thereby changing the distance with the preheating cylinder. This is adjusted according to the thickness of different corrugated cardboards. After adjustment, the corrugated cardboard can be passed between the movable rod and the preheating cylinder for preheating. At the same time, when replacing the preheating cylinder, because there is an inclined surface in the middle of the slide groove one and slide groove two, connecting rod one and connecting rod two will move upward along the inclined surface when moving, so that the connecting block Moved upwards together, when the connecting block moves upwards out of the inclined plane, saw tooth one will mesh with saw tooth three on the rack. As the connecting block continues to move, saw tooth one will drive the rack to rotate through the cooperation of saw tooth three and auxiliary gear. When the rack rotates, it will cause the rotating shaft to rotate through saw tooth two. The rotation of the rotating shaft will drive the movable rod to move away from the preheating cylinder through the cooperation of gear one and tooth block. The advantage of this is that the distance between the movable rod and the preheating cylinder can be adjusted according to the thickness of different corrugated cardboard, so that corrugated cardboard of different thicknesses can be preheated. At the same time, when disassembling the preheating cylinder, the movable rod will also move upwards with the movement of the cylinder, so that the preheating cylinder will not be stuck by the movable rod and difficult to remove when disassembling due to the small distance between the movable rod and the preheating cylinder. Attached Figure Description

[0013] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0014] Figure 1 A three-dimensional structural diagram of the preheating device for a corrugated cardboard production line; Figure 2 A partial cross-sectional three-dimensional structural diagram of the assembled fixing plate and paper guiding mechanism; Figure 3 This is a three-dimensional enlarged structural diagram of the adjustment mechanism; Figure 4 This is a three-dimensional enlarged structural diagram of the installation mechanism; Figure 5 for Figure 1 Enlarged structural diagram at point A in the middle.

[0015] [Figure Labels] 1. Base plate; 2. Fixing plate; 3. Slide groove one; 4. Slide groove two; 5. Mounting mechanism; 51. Connecting rod one; 52. Connecting block; 53. Sawtooth one; 54. Connecting rod two; 55. Fixing block; 56. Snap-fit ​​block one; 57. Snap-fit ​​groove one; 58. Telescopic rod; 59. Cylinder; 6. Paper guiding mechanism; 61. Movable rod; 62. Tooth block; 7. Adjusting mechanism; 71. Gear one; 72. Rotating shaft; 73. Sawtooth two; 74. Rack; 75. Sawtooth three; 76. Turntable; 8. Snap-fit ​​block two; 9. Snap-fit ​​groove two; 10. Preheating cylinder; 11. Through groove; 12. Slide groove three; 13. Movable groove; 14. Auxiliary gear.

[0016] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0017] The preheating device for a corrugated cardboard production line provided by this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0018] like Figure 1 , Figure 2 and Figure 4 As shown in the embodiment of this utility model, a preheating device for a corrugated cardboard production line is provided, including a base plate 1. Two opposing fixed plates 2 are fixedly connected to the top of the base plate 1. Each fixed plate 2 has a first groove 3 and a second groove 4. On the side of the fixed plates 2 that are close to each other, a second snap-fit ​​block 8 is fixedly connected between the first groove 3 and the second groove 4. The second snap-fit ​​block 8 has a second snap-fit ​​groove 9, the interior of which is used to place a preheating cylinder 10. An installation mechanism 5 is installed between the fixed plates 2 to fix the position of the preheating cylinder 10. The installation mechanism 5 includes a first connecting rod 51, the two ends of which pass through the first groove 3 and are respectively fixedly connected to the different fixed plates 2. Block 52, connecting rod 1 51 is slidably connected to slide groove 1 3, connecting rod 2 54 is fixedly connected to the side of connecting block 52 that is close to each other, the end of connecting rod 2 54 away from connecting block 52 passes through slide groove 2 4 through fixing plate 2 and is fixedly connected to fixing block 55, connecting rod 2 54 and slide groove 2 4 are slidably connected, fixing block 55 is fixedly connected to the side of locking block 2 8 that is close to locking block 2 9 that can be inserted into locking groove 2 9, locking block 1 56 is provided on the side of locking block 1 56 that is close to locking block 2 8 and has locking groove 1 57 that is adapted to preheating cylinder 10, telescopic rod 58 is fixedly connected to the bottom of connecting block 52, and cylinder 59 with output end fixedly connected to telescopic rod 58 is installed on the top of base plate 1.

[0019] By setting up the installation mechanism 5, when the preheating cylinder 10 shows signs of wear after prolonged use and needs to be removed and replaced, the cylinder 59 is activated. The output end of the cylinder 59 will drive the telescopic rod 58 to move. The connecting block 52 at the top of the telescopic rod 58 will be moved, allowing the connecting rod 2 54 to slide inside the slide groove 2 4. The connecting rod 1 51 slides inside the slide groove 1 3 along with the connecting block 52 to assist the movement of the connecting rod 2 54 and ensure stability. When the connecting rod 2 54 slides, it will drive the locking block 1 56 to move out of the locking groove 2 9 through the fixing block 55, so that the locking groove 1 57 on the locking block 1 56 no longer abuts against the preheating cylinder 10. When the connecting rod 2 54 moves to the end of the slide groove 2 4 and the locking block 1 56 moves away from the preheating cylinder 10, the connecting rod 2 54 moves to the end of the slide groove 2 4 and the locking block 1 56 moves away from the preheating cylinder 10. When the preheating cylinder 10 is in place, both ends of the preheating cylinder 10 can be directly pushed out of the second snap-fit ​​groove 9 to complete the disassembly of the preheating cylinder 10. Then, the new preheating cylinder 10 is placed inside the second snap-fit ​​groove 9, and the cylinder 59 is reset. The second connecting rod 54 is reset and moved by the telescopic rod 58 and the connecting block 52. When the second connecting rod 54 moves, it drives the fixing block 55 to move the first snap-fit ​​block 56 closer to the preheating cylinder 10. Finally, the first snap-fit ​​groove 57 on the first snap-fit ​​block 56 abuts against the preheating cylinder 10 and cooperates with the second snap-fit ​​groove 9 to lock the preheating cylinder 10, thus completing the installation. The advantage of this method is that the preheating cylinder 10 can be quickly disassembled, which facilitates the replacement of the preheating cylinder 10 and improves the efficiency of preheating and producing corrugated cardboard.

[0020] like Figures 1-3 and Figure 5 As shown, each of the fixed plates 2 has a through groove 11 on its adjacent sides. A sliding groove 12 is formed inside the through groove 11, and a movable groove 13 is formed on one side of the sliding groove 12. A paper guiding mechanism 6 is installed inside the sliding groove 12. The paper guiding mechanism 6 includes toothed blocks 62 that can slide inside the sliding groove 12. A movable rod 61, passing through the through groove 11 and slidably connected to the toothed blocks 62, is fixedly connected to the same movable rod 61. An adjustment mechanism 7 is installed on the fixed plate 2 to adjust the position of the movable rod 61. The adjustment mechanism 7 includes a gear 71 located inside the movable groove 13, which meshes with the toothed blocks 62. A through-plate is fixedly connected to the side of the gear 71 that is furthest from each other. The rotating shaft 72 of 2 has several serrations 73 arranged in a circumferential pattern around the rotating shaft 72 fixedly connected to its outer surface. A rack 74 meshes with the serrations 73. Several serrations 75 arranged in a circumferential pattern around the rack 74 are fixedly connected to the outer wall of the rack 74. A turntable 76 is fixedly connected to the end of the rotating shaft 72 away from the gear 71. Several serrations 53 are fixedly connected to the top of the connecting block 52. The serrations 53 can mesh with the serrations 75 on the rack 74. Auxiliary gears 14 are rotatably connected to the sides of the fixed plates 2 that are far apart from each other. The auxiliary gears 14 are located inside the rack 74 and mesh with the rack 74. Inclined slopes are provided in the middle of the interior of the sliding groove 3 and the sliding groove 4.

[0021] By setting up the paper guiding mechanism 6 and the adjusting mechanism 7, when different corrugated cardboards need to be preheated, the turntable 76 is rotated, which drives the rotating shaft 72 to rotate. This causes gear 71 to rotate inside the movable groove 13 under the influence of the rotating shaft 72. When gear 71 rotates, it drives the meshing tooth block 62 to move inside the slide groove 12. When the tooth block 62 moves, the movable rod 61 is also driven to move inside the through groove 11, thereby changing the distance between it and the preheating cylinder 10. This is adjusted according to the thickness of different corrugated cardboards. After the adjustment is completed, the corrugated cardboard can be passed between the movable rod 61 and the preheating cylinder 10 for preheating. At the same time, when the preheating cylinder 10 is replaced, since there is an inclined surface in the middle of the slide groove 3 and the slide groove 4, the connecting rod 51 and the connecting rod 54 will move upward along the inclined surface when they move, causing the connecting block 52 to be driven upward together. When the connecting block 52 moves upward out of the inclined plane, the first saw tooth 53 will mesh with the third saw tooth 75 on the rack 74. As the connecting block 52 continues to move, the first saw tooth 53 will drive the rack 74 to rotate through the cooperation of the third saw tooth 75 and the auxiliary gear 14. When the rack 74 rotates, it will cause the rotating shaft 72 to rotate through the second saw tooth 73. The rotation of the rotating shaft 72 will drive the movable rod 61 to move away from the preheating cylinder 10 through the cooperation of the first gear 71 and the tooth block 62. The advantage of doing this is that the distance between the movable rod 61 and the preheating cylinder 10 can be adjusted according to the thickness of different corrugated cardboard, so that corrugated cardboard of different thicknesses can be preheated. At the same time, when disassembling the preheating cylinder 10, the movable rod 61 will also move upward with the movement of the cylinder 59, so that the preheating cylinder 10 will not be stuck by the movable rod 61 and difficult to remove when disassembling because the distance between the movable rod 61 and the preheating cylinder 10 is too small.

[0022] The technical solution provided by this utility model, through the installation mechanism 5, allows for the activation of cylinder 59 when the preheating cylinder 10 shows signs of wear after prolonged use and needs to be removed and replaced. The output end of cylinder 59 drives the telescopic rod 58 to move, and the connecting block 52 at the top of the telescopic rod 58 is moved, allowing connecting rod 2 54 to slide inside the slide groove 2 4. Connecting rod 1 51 slides inside the slide groove 1 3 along with connecting block 52, assisting connecting rod 2 54 in moving smoothly. During sliding, connecting rod 2 54, through fixing block 55, drives locking block 1 56 to move out of locking groove 2 9, so that locking groove 1 57 on locking block 1 56 no longer abuts against the preheating cylinder 10. When connecting rod 2 54 moves to the end of slide groove 2 4, locking block 1 56... When cylinder 56 is far from preheating cylinder 10, both ends of preheating cylinder 10 can be pushed directly out of the snap-fit ​​groove 2 9 to complete the disassembly of preheating cylinder 10. Then, the new preheating cylinder 10 is placed inside the snap-fit ​​groove 2 9, and cylinder 59 is reset. The connecting rod 2 54 is reset and moved by telescopic rod 58 and connecting block 52. When the connecting rod 2 54 moves, it drives the fixing block 55 to move snap-fit ​​block 1 56 closer to preheating cylinder 10. Finally, snap-fit ​​groove 1 57 on snap-fit ​​block 1 56 abuts against preheating cylinder 10 and cooperates with snap-fit ​​groove 2 9 to snap-fit ​​preheating cylinder 10, completing the installation. The advantage of this is that preheating cylinder 10 can be quickly disassembled, making it convenient to replace preheating cylinder 10 and improving the efficiency of preheating and producing corrugated cardboard.

[0023] By setting up the paper guiding mechanism 6 and the adjusting mechanism 7, when different corrugated cardboards need to be preheated, the turntable 76 is rotated, which drives the rotating shaft 72 to rotate. This causes gear 71 to rotate inside the movable groove 13 under the influence of the rotating shaft 72. When gear 71 rotates, it drives the meshing tooth block 62 to move inside the slide groove 12. When the tooth block 62 moves, the movable rod 61 is also driven to move inside the through groove 11, thereby changing the distance between it and the preheating cylinder 10. This is adjusted according to the thickness of different corrugated cardboards. After the adjustment is completed, the corrugated cardboard can be passed between the movable rod 61 and the preheating cylinder 10 for preheating. At the same time, when the preheating cylinder 10 is replaced, since there is an inclined surface in the middle of the slide groove 3 and the slide groove 4, the connecting rod 51 and the connecting rod 54 will move upward along the inclined surface when they move, causing the connecting block 52 to be driven upward together. When the connecting block 52 moves upward out of the inclined plane, the first saw tooth 53 will mesh with the third saw tooth 75 on the rack 74. As the connecting block 52 continues to move, the first saw tooth 53 will drive the rack 74 to rotate through the cooperation of the third saw tooth 75 and the auxiliary gear 14. When the rack 74 rotates, it will cause the rotating shaft 72 to rotate through the second saw tooth 73. The rotation of the rotating shaft 72 will drive the movable rod 61 to move away from the preheating cylinder 10 through the cooperation of the first gear 71 and the tooth block 62. The advantage of doing this is that the distance between the movable rod 61 and the preheating cylinder 10 can be adjusted according to the thickness of different corrugated cardboard, so that corrugated cardboard of different thicknesses can be preheated. At the same time, when disassembling the preheating cylinder 10, the movable rod 61 will also move upward with the movement of the cylinder 59, so that the preheating cylinder 10 will not be stuck by the movable rod 61 and difficult to remove when disassembling because the distance between the movable rod 61 and the preheating cylinder 10 is too small.

[0024] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art can fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0025] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A preheating device for a corrugated cardboard production line, characterized in that, include: The base plate (1) has two opposing fixed plates (2) fixedly connected to its top. Each fixed plate (2) has a sliding groove (3) and a sliding groove (4). On the side of the fixed plates (2) that are close to each other, a snap-fit ​​block (8) is fixedly connected between the sliding groove (3) and the sliding groove (4). The snap-fit ​​block (8) has a snap-fit ​​groove (9). The interior of the snap-fit ​​groove (9) is used to place the preheating cylinder (10). An installation mechanism (5) is installed between the fixed plates (2) to fix the position of the preheating cylinder (10). The installation mechanism (5) includes a connecting rod (51). Both ends of the connecting rod (51) pass through different fixing plates (2) through the sliding groove (3) and are fixedly connected to connecting blocks (52). The connecting rod (51) is slidably connected to the sliding groove (3). The connecting blocks (52) are fixedly connected to each other on the side that is close to each other. The end of the connecting rod (54) away from the connecting block (52) passes through the fixing plate (2) through the sliding groove (4) and is fixedly connected to a fixing block (55). The second connecting rod (54) and the second sliding groove (4) are slidably connected. The first locking block (56) that can be inserted into the second locking groove (9) is fixedly connected to the side of the fixed block (55) near the second locking block (8). The first locking block (56) near the second locking block (8) has a first locking groove (57) that is adapted to the preheating cylinder (10). The bottom of the connecting block (52) is fixedly connected to the telescopic rod (58). The top of the base plate (1) is equipped with a cylinder (59) whose output end is fixedly connected to the telescopic rod (58).

2. The preheating device for a corrugated cardboard production line according to claim 1, characterized in that, The fixed plates (2) are provided with through grooves (11) on their adjacent sides. A sliding groove (12) is provided inside the through groove (11). A movable groove (13) is provided on one side of the sliding groove (12). A paper guiding mechanism (6) is provided inside the sliding groove (12). The paper guiding mechanism (6) includes toothed blocks (62) that can slide inside the sliding groove (12). The toothed blocks (62) are fixedly connected to the same movable rod (61) that passes through the fixed plate (2) through the through groove (11). The movable rod (61) is slidably connected to the through groove (11).

3. The preheating device for a corrugated cardboard production line according to claim 2, characterized in that, The fixed plate (2) is equipped with an adjustment mechanism (7) that can adjust the position of the movable rod (61). The adjustment mechanism (7) includes a gear (71) located inside the movable groove (13). The gear (71) meshes with the tooth block (62). A rotating shaft (72) that passes through the fixed plate (2) is fixedly connected to the side of the gear (71) that is far away from each other. Several serrations (73) arranged in a circumferential shape around the rotating shaft (72) are fixedly connected to the outer surface of the rotating shaft (72). A rack (74) meshes with the serrations (73). Several serrations (75) arranged in a circumferential shape around the rack (74) are fixedly connected to the outer wall of the rack (74). A turntable (76) is fixedly connected to the end of the rotating shaft (72) that is far away from the gear (71).

4. The preheating device for a corrugated cardboard production line according to claim 3, characterized in that, The top of the connecting block (52) is fixedly connected with several saw teeth (53), which can mesh with the saw teeth (75) on the rack (74).

5. The preheating device for a corrugated cardboard production line according to claim 3, characterized in that, Each of the fixed plates (2) is rotatably connected to an auxiliary gear (14) on the side that is far apart from each other. The auxiliary gear (14) is located inside the rack (74) and meshes with the rack (74).

6. The preheating device for a corrugated cardboard production line according to claim 1, characterized in that, An inclined slope is provided in the middle of the interior of the first slide (3) and the second slide (4).

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