Corrugated paper pre-folding mechanism and automatic folding device

Abstract

The application discloses a corrugated paper pre-folding mechanism and an automatic folding device, and the mechanism comprises a paperboard conveying mechanism and a synchronous integral bending mechanism; the synchronous integral bending mechanism comprises a bending chain, a synchronous conveying driving mechanism and a turnover driving mechanism; the bending chain comprises upper bending chains and lower bending chains, the upper bending chains are provided with two and are arranged along the direction perpendicular to the corrugated paper conveying direction, the lower bending chains are provided with two and are arranged along the direction perpendicular to the corrugated paper conveying direction, and in the vertical projection, the two upper bending chains are located between the two lower bending chains; the synchronous conveying driving mechanism is power-connected with the bending chain, the synchronous conveying driving mechanism drives the bending chain to move at the speed equal to the speed of the paperboard conveying mechanism conveying the corrugated paper; and the turnover driving mechanism is power-connected with the lower bending chain. The application can pre-fold the corrugated paper more accurately, obtain the specified creases, and is favorable for obtaining a better folding effect.

Description

Technical Field

[0001] This invention relates to folding devices, specifically to a corrugated paper pre-folding mechanism and an automatic folding device. Background Technology

[0002] Corrugated cardboard is a multi-layered bonded structure, consisting of at least one layer of corrugated core paper and one layer of cardboard. It possesses high mechanical strength, capable of withstanding impacts and drops during handling. The actual performance of a corrugated box depends on three factors: the characteristics of the core paper and cardboard, and the box's own structure. Due to its superior performance and ease of processing, corrugated boxes have gradually replaced wooden crates and other transport packaging containers, becoming the mainstay of transport packaging. Besides protecting goods and facilitating warehousing and transportation, they also serve to beautify and promote products.

[0003] In existing corrugated paper processing, corrugated cardboard is fed from the feeding mechanism and conveyed sequentially to the printing, cutting, folding, and gluing mechanisms for processing, forming folded cartons, which are then collected and packaged. Further, during the folding process, creases are typically first pressed onto the corrugated board using pressure rollers, and then the folding is guided by guide rods, as illustrated in the gluing and folding device for an ultra-large corrugated paper printing line disclosed in application CN111605243A. Alternatively, creases may be deepened or corrected during the flipping process, as illustrated in the automatic corrugated paper folding device and method disclosed in application CN118684059A.

[0004] The above-mentioned folding device has the following shortcomings:

[0005] When creating or deepening creases on corrugated cardboard, the pressure is applied continuously from one end to the other. However, corrugated cardboard is a material with both rigidity and flexibility. When the front of the cardboard is compressed, it causes uncontrollable stretching and deformation at the back, resulting in irregular deformation at the back. In other words, the unpressed parts will shift. Even when bending the cardboard tightly with a pressure roller, it is difficult to obtain the desired crease, and the folding effect needs to be improved. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned problems and provide a corrugated paper pre-folding mechanism that can pre-fold corrugated paper more accurately to obtain specified creases, which is beneficial to obtaining better folding effect.

[0007] Another object of the present invention is to provide an automatic corrugated paper folding device.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A corrugated paper pre-folding mechanism includes a paperboard conveying mechanism for conveying corrugated paper and a synchronous integral bending mechanism for bending the corrugated paper as a whole during the conveying process.

[0010] The synchronous integral bending mechanism includes a bending chain, a synchronous conveying drive mechanism, and a flipping drive mechanism;

[0011] The bending chain includes an upper bending chain and a lower bending chain. There are two upper bending chains arranged in a direction perpendicular to the corrugated paper conveying direction. There are two lower bending chains arranged in a direction perpendicular to the corrugated paper conveying direction. In the vertical projection, the two upper bending chains are located parallel between the two lower bending chains.

[0012] The synchronous conveying drive mechanism is poweredly connected to the bending chain, and the speed at which the synchronous conveying drive mechanism drives the bending chain to move is equal to the speed at which the cardboard conveying mechanism conveys corrugated paper.

[0013] The flipping drive mechanism is powered by the lower bending chain. In operation, the corrugated paper is located between the upper and lower bending chains. The flipping drive mechanism drives the lower bending chain to flip upward, and the lower bending chain pushes the folded part of the entire corrugated paper to bend upward around the boundary of the upper bending chain, forming a crease at the position of the corrugated paper corresponding to the boundary of the bending chain.

[0014] The working principle of the above-mentioned corrugated paper pre-folding mechanism is as follows:

[0015] During operation, the corrugated paper to be folded is conveyed by the cardboard conveying mechanism. When the corrugated paper is conveyed between the upper and lower bending chains, the speed of the upper and lower bending chains is equal to the speed of the corrugated paper, so that the upper and lower bending chains and the corrugated paper are in a relatively stationary state. On the one hand, this will not cause pulling when the corrugated paper is bent later, ensuring that the corrugated paper is pre-folded in a straight posture and that the crease meets the specified requirements. On the other hand, bending work can be carried out during the conveying process without stopping, ensuring high work efficiency.

[0016] When the entire corrugated paper is fully conveyed between the upper and lower bending chains, while maintaining synchronous movement, the lower bending chain is driven upward by the flipping drive mechanism. Under the limit of the upper bending chain, the lower bending chain simultaneously pushes the entire folded part of the corrugated paper to bend upward around the boundary of the upper bending chain. The force is balanced and even, avoiding unnecessary deformation and displacement of the corrugated paper, thus forming a relatively precise crease on the corrugated paper in one go, which is conducive to obtaining a better folding effect.

[0017] In a preferred embodiment of the present invention, both the upper and lower bending chains are provided with multiple bending and pressing plates. These plates are evenly arranged along the upper and lower bending chains, forming continuous, cyclical pressing plate circles. With this structure, when the multiple bending and pressing plates are arranged in a straight line, they function like a straight plate, providing a near-uniform working surface, increasing the working area, and facilitating the smooth completion of the pre-bending process.

[0018] In a preferred embodiment of the present invention, a support plate is provided on the inner side of the extrusion plate rings corresponding to the upper and lower bending chains, and the support plate is located between the two corresponding sprockets. This provides rigid support for the bending extrusion plates during bending, allowing the bending extrusion plates to smoothly and precisely bend the corrugated paper.

[0019] In a preferred embodiment of the present invention, the cardboard conveying mechanism includes a conveyor wheel set, a conveying transmission assembly, and a conveying drive motor. The conveyor wheel set is provided in multiple sets, and each set includes conveyor wheels arranged vertically opposite each other. The conveying transmission assembly includes a drive shaft, a synchronous belt, and a synchronous pulley. The drive shaft is provided in multiple sets and is connected to different conveyor wheels respectively.

[0020] Furthermore, the synchronous conveying drive mechanism includes a synchronous drive motor and a synchronous transmission assembly. The synchronous drive motor is composed of a conveying drive motor, and the synchronous transmission assembly is composed of a conveying transmission assembly. The upper bending chain is connected to two of the upper transmission shafts of the conveying transmission assembly via two sprockets. In vertical projection, the conveying wheel is located between the two upper bending chains. The lower bending chain is connected to two of the lower transmission shafts of the conveying transmission assembly via two sprockets. This structure allows for the sharing of power among the cardboard conveying mechanisms, ensuring the same speed while simplifying the structure and reducing costs.

[0021] Furthermore, the sprocket of the lower bending chain is connected to the drive shaft of the conveyor transmission assembly via a universal coupling, so that the lower bending chain can be rotated and moved.

[0022] Furthermore, the flipping drive mechanism includes a flipping mounting frame, a flipping drive motor, and a flipping transmission assembly. The flipping mounting frame is fixedly connected to the half-shaft of the sprocket near the lower bending chain of the universal coupling. The flipping transmission assembly includes a flipping transmission gear and a flipping transmission rack. The flipping transmission gear is mounted on the output shaft of the flipping drive motor, and the flipping transmission rack has an arc-shaped structure. The flipping transmission rack is fixedly connected to the flipping mounting frame and is mounted on the frame via an arc-shaped guide structure. The center of the arc-shaped guide structure coincides with the rotation center of the corrugated paper bending. Through this structure, driven by the flipping drive motor, the flipping transmission gear can drive the flipping transmission rack to slide on the arc-shaped guide structure, thereby driving the lower bending chain to flip upwards around the center of the arc-shaped guide structure, achieving pre-folding of the corrugated paper. Because the center of the arc-shaped guide structure coincides with the rotation center of the corrugated paper bending, the lower bending chain will not move relative to the corrugated paper during the flipping process. It maintains a relatively static posture to bend the corrugated paper, avoiding unnecessary deformation and displacement of the corrugated paper, and further improving the quality of the crease.

[0023] An automatic corrugated paper folding device includes the corrugated paper pre-folding mechanism.

[0024] In a preferred embodiment of the invention, a formal folding mechanism is further included, which is disposed downstream of the corrugated paper pre-folding mechanism, and the formal folding mechanism includes two opposing folding guide rods.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The corrugated paper pre-folding mechanism of the present invention drives the lower bending chain to flip upward through the flipping drive mechanism. Under the limit of the upper bending chain, the lower bending chain simultaneously pushes the entire folding part of the corrugated paper to bend upward around the boundary of the upper bending chain. The force is balanced and uniform, avoiding unnecessary deformation and displacement of the corrugated paper, thereby forming a more precise crease on the corrugated paper in one go, which is conducive to obtaining a better folding effect.

[0027] 2. Since the speed of the upper and lower bending chains is equal to the speed of the corrugated paper, the upper and lower bending chains are relatively stationary with respect to the corrugated paper. On the one hand, this prevents pulling when bending the corrugated paper later, ensuring that the corrugated paper is pre-folded in a straight position and that the creases meet the specified requirements. On the other hand, bending can be performed during the conveying process without stopping, ensuring high work efficiency. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the automatic corrugated paper folding device of the present invention.

[0029] Figure 2 This is a front view of the corrugated paper pre-folding mechanism of the present invention.

[0030] Figures 3-4 This is a side view of the corrugated paper pre-folding mechanism of the present invention in two states.

[0031] Figure 5 for Figure 4 A magnified view of X in the image.

[0032] Figure 6 This is a partial three-dimensional structural diagram of the corrugated paper pre-folding mechanism of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0034] Combination Figure 1 The corrugated paper automatic folding device of this embodiment includes a corrugated paper pre-folding mechanism and a formal folding mechanism. The formal folding mechanism is located downstream of the corrugated paper pre-folding mechanism and includes two folding guide rods 1 arranged opposite to each other. The specific structure can be referred to the prior art.

[0035] Combination Figures 1-6 The corrugated paper pre-folding mechanism includes a paperboard conveying mechanism for conveying corrugated paper and a synchronous integral bending mechanism for bending the corrugated paper as a whole during the conveying process. The synchronous integral bending mechanism includes a bending chain, a synchronous conveying drive mechanism, and a flipping drive mechanism. The bending chain includes an upper bending chain 2 and a lower bending chain 3. There are two upper bending chains 2 arranged along a direction perpendicular to the conveying direction of the corrugated paper, and there are two lower bending chains 3 arranged along a direction perpendicular to the conveying direction of the corrugated paper. In vertical projection, the two upper bending chains 2 are parallel to the two lower bending chains 3. Between chains 3; the synchronous conveying drive mechanism is poweredly connected to the bending chain, and the speed at which the synchronous conveying drive mechanism drives the bending chain to move is equal to the speed at which the cardboard conveying mechanism conveys the corrugated paper; the flipping drive mechanism is poweredly connected to the lower bending chain 3; in the working state, the corrugated paper is located between the upper bending chain 2 and the lower bending chain 3, and the lower bending chain 3 is driven to flip upward by the flipping drive mechanism, and the lower bending chain 3 pushes the folded part of the entire corrugated paper to bend upward around the boundary of the upper bending chain 2, forming a crease at the position of the corrugated paper corresponding to the boundary of the bending chain.

[0036] Combination Figures 2-6Both the upper bending chain 2 and the lower bending chain 3 are provided with multiple bending and pressing plates 4. The bending and pressing plates 4 are evenly arranged along the upper bending chain 2 and the lower bending chain 3, forming continuous cyclic pressing plate circles. With the above structure, when the multiple bending and pressing plates 4 are arranged in a straight line, they are equivalent to a straight plate, thereby providing a near-uniform working surface, increasing the working area, and facilitating the smooth completion of the pre-bending work.

[0037] Combination Figure 2 The inner side of the extrusion plate rings corresponding to the upper bending chain 2 and the lower bending chain 3 are provided with support plates 5, which are located between the two corresponding sprockets. In this way, rigid support can be provided for the bending extrusion plate 4 during bending, so that the bending extrusion plate 4 can bend the corrugated paper smoothly and in place.

[0038] Combination Figures 1-6 The cardboard conveying mechanism includes conveyor wheel sets, a conveyor transmission assembly, and a conveyor drive motor. The conveyor wheel sets are provided in multiple groups, each group including conveyor wheels 7 arranged vertically opposite each other. The conveyor transmission assembly includes a drive shaft 8, a synchronous belt, and synchronous pulleys. Multiple drive shafts 8 are provided, each connected to a different conveyor wheel 7. Specifically, the conveyor wheel sets on the left and right sides along the direction of corrugated paper conveying use different drive mechanisms, operate independently, and can adjust the wheel spacing to accommodate corrugated paper of different sizes.

[0039] Furthermore, the synchronous conveying drive mechanism includes a synchronous drive motor and a synchronous transmission assembly. The synchronous drive motor is composed of a conveying drive motor, and the synchronous transmission assembly is composed of a conveying transmission assembly. The upper bending chain 2 is connected to two of the upper transmission shafts 8 of the conveying transmission assembly via two sprockets. In vertical projection, the conveying wheel 7 is located between the two upper bending chains 2. The lower bending chain 3 is connected to two of the lower transmission shafts 8 of the conveying transmission assembly via two sprockets. With this structure, the power of the cardboard conveying mechanism can be shared, ensuring the same speed while simplifying the structure and reducing costs.

[0040] Combination Figures 3-6 The sprocket of the lower bending chain 3 is connected to the drive shaft 8 of the conveying transmission assembly via a universal coupling 9, so that the lower bending chain 3 can be rotated and moved.

[0041] Combination Figures 2-6The flipping drive mechanism includes a flipping mounting frame 10, a flipping drive motor 11, and a flipping transmission assembly. The flipping mounting frame 10 is fixedly connected to the half-shaft of the sprocket near the lower bending chain 3 of the universal coupling 9. The flipping transmission assembly includes a flipping transmission gear 12 and a flipping transmission rack 13. The flipping transmission gear 12 is mounted on the output shaft of the flipping drive motor 11, and the flipping transmission rack 13 has an arc-shaped structure. The flipping transmission rack 13 is fixedly connected to the flipping mounting frame 10 and is mounted on the frame through an arc-shaped guide structure. The center of the arc-shaped guide structure coincides with the rotation center of the corrugated paper bending. Through the above structure, under the drive of the flipping drive motor 11, the flipping transmission gear 12 can drive the flipping transmission rack 13 to slide on the arc-shaped guide structure, thereby driving the lower bending chain 3 to flip upwards around the center of the arc-shaped guide structure, realizing the pre-folding of the corrugated paper. Figure 4 In this case, because the center of the arc-shaped guide structure coincides with the rotation center of the corrugated paper bending, such as Figure 5 Therefore, during the flipping process, the lower bending chain 3 will not move relative to the corrugated paper, maintaining a relatively static posture to bend the corrugated paper, avoiding unnecessary deformation and displacement of the corrugated paper, and further improving the quality of the crease.

[0042] Combination Figures 1-6 The working principle of the corrugated paper pre-folding mechanism in this embodiment is as follows:

[0043] During operation, the corrugated paper to be folded is conveyed by the cardboard conveying mechanism. When the corrugated paper is conveyed between the upper bending chain 2 and the lower bending chain 3, the moving speed of the upper bending chain 2 and the lower bending chain 3 is equal to the moving speed of the corrugated paper, so that the upper bending chain 2, the lower bending chain 3 and the corrugated paper are in a relatively stationary state. On the one hand, it will not cause pulling when bending the corrugated paper later, ensuring that the corrugated paper is pre-folded in a straight posture and that the crease meets the specified requirements. On the other hand, bending work can be carried out during the conveying process without stopping, ensuring high work efficiency.

[0044] When the entire corrugated paper is completely conveyed between the upper bending chain 2 and the lower bending chain 3, while maintaining synchronous movement, the lower bending chain 3 is driven to flip upward by the flipping drive mechanism. Under the limit of the upper bending chain 2, the lower bending chain 3 simultaneously pushes the entire folded part of the corrugated paper to bend upward around the boundary of the upper bending chain 2. The force is balanced and even, avoiding unnecessary deformation and displacement of the corrugated paper, thus forming a relatively precise crease on the corrugated paper in one go, which is conducive to obtaining a better folding effect.

[0045] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A corrugated paper pre-folding mechanism, characterized in that, It includes a paperboard conveying mechanism for conveying corrugated paper and a synchronous integral bending mechanism for bending the corrugated paper as a whole during the conveying process; The synchronous integral bending mechanism includes a bending chain, a synchronous conveying drive mechanism, and a flipping drive mechanism; The bending chain includes an upper bending chain and a lower bending chain. There are two upper bending chains arranged in a direction perpendicular to the corrugated paper conveying direction. There are two lower bending chains arranged in a direction perpendicular to the corrugated paper conveying direction. In the vertical projection, the two upper bending chains are located parallel between the two lower bending chains. The synchronous conveying drive mechanism is poweredly connected to the bending chain, and the speed at which the synchronous conveying drive mechanism drives the bending chain to move is equal to the speed at which the cardboard conveying mechanism conveys corrugated paper. The flipping drive mechanism is powered by the lower bending chain. In operation, the corrugated paper is located between the upper and lower bending chains. The flipping drive mechanism drives the lower bending chain to flip upward, and the lower bending chain pushes the folded part of the entire corrugated paper to bend upward around the boundary of the upper bending chain, forming a crease at the position of the corrugated paper corresponding to the boundary of the bending chain.

2. The corrugated paper pre-folding mechanism according to claim 1, characterized in that, Both the upper and lower bending chains are provided with multiple bending extrusion plates, which are evenly arranged along the upper and lower bending chains and form continuous cyclic extrusion plate circles.

3. The corrugated paper pre-folding mechanism according to claim 2, characterized in that, The inner side of the extrusion rings corresponding to the upper and lower bending chains is provided with a support plate, which is located between the two corresponding sprockets.

4. The corrugated paper pre-folding mechanism according to claim 1, characterized in that, The cardboard conveying mechanism includes a conveyor wheel set, a conveying transmission assembly, and a conveying drive motor. The conveyor wheel set has multiple sets, and each set includes conveyor wheels arranged vertically opposite each other. The conveying transmission assembly includes a drive shaft, a synchronous belt, and a synchronous pulley. The drive shaft has multiple sets and is connected to different conveyor wheels.

5. The corrugated paper pre-folding mechanism according to claim 4, characterized in that, The synchronous conveying drive mechanism includes a synchronous drive motor and a synchronous transmission assembly. The synchronous drive motor is composed of a conveying drive motor, and the synchronous transmission assembly is composed of a conveying transmission assembly. The upper bent chain is connected to two of the upper transmission shafts of the conveying transmission assembly through two sprockets.

6. The corrugated paper pre-folding mechanism according to claim 5, characterized in that, In the vertical projection, the conveyor wheel is located between two upper bent chains; the lower bent chains are connected to two of the lower drive shafts of the conveyor drive assembly via two sprockets.

7. The corrugated paper pre-folding mechanism according to claim 5, characterized in that, The sprocket of the lower bending chain is connected to the drive shaft of the conveyor transmission assembly via a universal coupling.

8. The corrugated paper pre-folding mechanism according to claim 7, characterized in that, The flipping drive mechanism includes a flipping mounting frame, a flipping drive motor, and a flipping transmission assembly. The flipping mounting frame is fixedly connected to the half-shaft of the sprocket near the lower bending chain of the universal coupling. The flipping transmission assembly includes a flipping transmission gear and a flipping transmission rack. The flipping transmission gear is mounted on the output shaft of the flipping drive motor. The flipping transmission rack has an arc-shaped structure and is fixedly connected to the flipping mounting frame. The flipping transmission rack is mounted on the frame through an arc-shaped guide structure, the center of which coincides with the rotation center of the corrugated paper bending.

9. An automatic corrugated paper folding device, characterized in that, Includes the corrugated paper pre-folding mechanism as described in any one of claims 1-8.

10. The automatic corrugated paper folding device according to claim 9, characterized in that, It also includes a formal folding mechanism located downstream of the corrugated paper pre-folding mechanism, which includes two opposing folding guide rods.

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