A four-corner wire pressing device for a paperboard slotter and a paperboard slotter

Abstract

The application discloses a four-corner line pressing device for a paperboard slotting machine, which comprises a constraint conveying mechanism and four line pressing mechanisms respectively arranged at four corners of the paperboard; the constraint conveying mechanism comprises a conveying plane for conveying the constrained paperboard, the conveying plane passes through a line pressing station, the line pressing mechanisms are arranged at the line pressing station, and the line pressing mechanisms are distributed on the longitudinal sides of the conveying plane in pairs; the line pressing mechanism comprises an upper pressing plate and a lower line pressing cutter plate, the upper pressing plate and the lower line pressing cutter plate are arranged oppositely, an L-shaped line pressing cutter is arranged on the lower line pressing cutter plate, the upper pressing plate is in transmission connection with a lifting driving mechanism, and the upper pressing plate is in cooperation with the L-shaped line pressing cutter on the lower line pressing cutter plate to press an L-shaped line on the paperboard. The four line pressing mechanisms correspond to the four corners of the paperboard, each line pressing mechanism comprises an upper pressing plate and an L-shaped line pressing cutter of a lower line pressing cutter plate, the upper pressing plate and the lower line pressing cutter plate are in cooperation to press a line on the back of the paperboard to form an L-shaped cutter mark, the four line pressing mechanisms are in synchronous action, the L-shaped cutter mark is formed at the four corners of the paperboard at one time, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cardboard slotting machines, and more particularly to a four-corner creasing device for a cardboard slotting machine and a cardboard slotting machine. Background Technology

[0002] Existing cardboard slotting machines typically require cutting serrations at the four corners of the back of the cardboard, with a cutting depth of half the cardboard thickness. After cutting, the cardboard is fed into a slotting device for crisscross slotting. The slotting path follows the cutting path, causing the corners at the serration locations to fall off, forming a cardboard box blank. This cardboard box blank can be folded to form a box or lid. However, existing equipment usually uses a ribbing method to create serrations on the back of the cardboard, requiring separate horizontal and vertical ribbing, resulting in an excessively long production line and low ribbing efficiency. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a four-corner creasing device for cardboard slotting machines, which improves production efficiency by creasing the four corners of cardboard in one operation.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a four-corner creasing device for a cardboard slotting machine, comprising a constraint conveying mechanism and four creasing mechanisms respectively arranged at the four corners of the cardboard; the constraint conveying mechanism includes a conveying plane for conveying the constrained cardboard, the conveying plane passing through a creasing station, the creasing mechanisms being arranged at the creasing station, and the creasing mechanisms being arranged in pairs on both longitudinal sides of the conveying plane; the creasing mechanism includes an upper pressure plate and a lower creasing blade plate, the upper pressure plate and the lower creasing blade plate being arranged opposite each other, the lower creasing blade plate being provided with an L-shaped creasing blade, the upper pressure plate being connected to a lifting drive mechanism, the upper pressure plate pressing down and cooperating with the L-shaped creasing blade on the lower creasing blade plate to press out an L-shaped creasing line on the cardboard.

[0005] The constraint conveying mechanism of the present invention is used to accurately convey cardboard to the creasing station, ensuring the accuracy of creasing. The creasing mechanism at the creasing station is integrated on both sides of the constraint conveying mechanism, shortening the production line length. The four creasing mechanisms correspond to the four corners of the cardboard. Each creasing mechanism includes an upper pressure plate and an L-shaped creasing knife of a lower creasing knife plate. The two work together to creasing the back of the cardboard to form an L-shaped knife mark. The four creasing mechanisms operate synchronously, forming an L-shaped knife mark at the four corners of the cardboard in one go, improving production efficiency.

[0006] Preferably, the lower crease cutter includes a cutter holder with a protrusion. The top surface of the protrusion forms a depth-limiting plane, and the height of the L-shaped crease cutter's blade protruding from the depth-limiting plane is no more than half the thickness of the cardboard. The depth-limiting plane restricts the cutting depth of the L-shaped crease cutter on the cardboard, preventing the corners of the cardboard from being completely cut off, which would affect the subsequent grooving process.

[0007] Based on the limiting block, the knife holder is provided with several mounting holes for springs. A ball bearing is connected to the top of the spring, and the ball bearing protrudes from the mounting hole surface and contacts the lower surface of the cardboard. The cardboard passes over the ball bearing, reducing friction and ensuring smooth movement. When the upper pressure plate presses down on the cardboard, causing the L-shaped crease cutter to enter, the cardboard may become trapped in the L-shaped crease cutter and unable to detach. When the upper pressure plate moves away, the ball bearing connected to the spring is no longer under pressure and springs upward, allowing the cardboard to smoothly detach from the L-shaped crease cutter.

[0008] In a system incorporating ball bearings, the top height of the ball bearings is higher than the top height of the L-shaped crease cutter, or the top height of the ball bearings is equal to the top height of the L-shaped crease cutter. This ensures smooth feeding and crease cutting of the cardboard.

[0009] Preferably, the constrained conveying mechanism includes a clamping conveyor belt, which comprises a top belt and a bottom belt, with the conveying plane positioned between the top and bottom belts. The clamping conveyor belt clamps the conveying cardboard between the top and bottom belts, thus constraining the cardboard and achieving precise conveying.

[0010] Preferably, the constrained conveying mechanism includes an adsorption conveyor belt, and the conveying plane is disposed on the adsorption surface of the adsorption conveyor belt in contact with the material. The cardboard is constrained by adsorption force to achieve precise conveying.

[0011] Preferably, the creasing mechanism is adjustable on the frame in both the longitudinal and transverse directions. The position of the creasing mechanism can be adjusted to accommodate different cardboard sizes.

[0012] Based on the adjustable pressing mechanism, multiple upper pressing plates are divided into two groups along the longitudinal direction. Each group of upper pressing plates is slidably set on the first longitudinal track. The first longitudinal track is set on the first transverse track through the first slider. Multiple lower pressing blades are divided into two groups along the longitudinal direction. Each group of lower pressing blades is slidably set on the second longitudinal track. The second longitudinal track is connected to the second transverse track through the lower slider.

[0013] A cardboard slotting machine includes a web guiding device, a four-corner creasing device, and a cardboard slotting device, wherein the four-corner creasing device is connected between the web guiding device and the cardboard slotting device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the wire pressing mechanism of the present invention.

[0016] Figure 3 This is a top view of the constraint conveying mechanism of the present invention, including the adsorption conveyor belt.

[0017] Figure 4 This is a schematic diagram of the structure of the pressure cutter plate of the present invention.

[0018] Figure 5 This is a side view of the pressure cutter plate of the present invention.

[0019] Figure 6 This is the present invention. Figure 5 A cross-sectional view along the AA direction.

[0020] Figure 7 yes Figure 6 A magnified view of part B.

[0021] Figure 8 This is a structural schematic diagram of the cardboard slotting machine of the present invention.

[0022] The names of the body parts referred to by the numbers in the above attached diagrams are as follows:

[0023] Among them, 1. Four-corner creasing device; 11. Crease lining mechanism; 111. Upper pressure plate; 112. Lower creasing blade plate; 112a. Protrusion; 112b. Depth limiting plane; 113. L-shaped creasing blade; 21. Clamping conveyor belt; 22. Adsorption conveyor belt; 3. Mounting hole; 4. Spring; 5. Ball bearing; 6. Correction device; 7. Cardboard slotting device; 8. Cardboard. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] See Figure 1A four-corner creasing device for a cardboard slotting machine includes a constraint conveying mechanism and four creasing mechanisms 11 respectively arranged at the four corners of the cardboard. The constraint conveying mechanism includes a conveying plane for conveying the constrained cardboard. The conveying plane passes over the creasing station. The constraint conveying mechanism restricts the cardboard from sliding or shifting during the conveying process and constrains the cardboard to move synchronously with the timing belt, thereby ensuring that the cardboard is accurately positioned at the creasing station and conveyed stably. A constraint conveying mechanism is a conveying mechanism that exerts a constraint force on the cardboard. This constraint force can be achieved by adsorbing or clamping the cardboard. Therefore, there are various implementation methods for constraint conveying mechanisms. For example, the constraint conveying mechanism may include a clamping conveyor belt 21, which comprises a top belt and a bottom belt. The conveying plane is positioned between the top and bottom belts, which clamp the cardboard. The clamping force constrains the cardboard, ensuring it is precisely conveyed to the top of the creasing mechanism 11 in a fixed posture, allowing the cardboard to move accurately into position. Alternatively, the constraint conveying mechanism may include an adsorption conveyor belt 22, with the conveying plane positioned on the adsorption surface of the adsorption conveyor belt 22 that contacts the material. The adsorption conveyor belt 22 has several adsorption holes distributed on it, which are connected to a negative pressure device to create an adsorption surface. The adsorption force constrains the cardboard, ensuring it moves with the synchronous belt and improving conveying accuracy. To accommodate large-sized cardboard, multiple constraint conveying mechanisms can be configured to form a conveying plane, and these constraint conveying mechanisms can be parallel to each other.

[0026] See Figure 1 and Figure 3The creasing mechanism 11 is configured at the creasing station, and the creasing mechanisms 11 are arranged in pairs on both sides of the longitudinal direction of the conveying plane. The creasing mechanism 11 is integrated on both sides of the constraint mechanism. Each creasing mechanism 11 includes an upper pressure plate 111 and a lower creasing blade plate 112. The upper pressure plate 111 and the lower creasing blade plate 112 are arranged opposite each other. The lower creasing blade plate 112 is provided with an L-shaped creasing blade 113. The upper pressure plate 111 is connected to the lifting drive mechanism. The lifting drive mechanism can be a gear and rack lifting mechanism or a screw lifting mechanism, etc. The upper pressure plate 111 presses down and cooperates with the L-shaped creasing blade 113 on the lower creasing blade plate 112 to press out an L-shaped creasing line on the paperboard. To ensure accurate subsequent grooving, the discharge end of the constraint conveying mechanism can be connected to a secondary correction mechanism. The secondary correction mechanism includes a correction channel, which can be connected to the discharge port of the constraint conveying mechanism or the inlet end of the correction channel can partially overlap with the discharge end of the constraint conveying mechanism. The correction channel corrects the paperboard. The secondary correction mechanism can use an edge correction method to correct the paperboard. For example, the secondary correction mechanism includes a left correction plate and a right correction plate, which are set on both sides of the discharge end of the constraint conveying mechanism. A correction channel is formed between the left correction plate and the right correction plate. The correction channel can be an equal-width channel or a converging channel, that is, the inlet width of the correction channel is greater than the outlet width, which ensures the correction effect while facilitating the entry of the paperboard.

[0027] See Figure 4 To prevent the L-shaped creasing knife 113 from cutting too deeply into the cardboard, the lower creasing knife plate 112 includes a knife holder. The top surface of the knife holder forms a depth-limiting plane 112b. The knife holder has a protrusion 112a. The side of the protrusion 112a is for mounting the L-shaped creasing knife 113. The top surface of the protrusion 112a forms the depth-limiting plane 112b. The protrusion 112a limits the downward movement of the upper pressure plate 111. The height of the blade of the L-shaped creasing knife 113 protruding from the depth-limiting plane 112b is no more than half the thickness of the cardboard, ensuring the depth of the cut.

[0028] See Figures 5-7To ensure smooth cardboard movement, the knife holder has several mounting holes 3 for installing springs 4. A ball bearing 5 is connected to the top of each spring 4, protruding from the mounting hole 3 and contacting the lower surface of the cardboard. The ball bearing 5 rolls against the cardboard, reducing friction and ensuring smooth movement. When the upper pressure plate 111 presses down on the cardboard, the ball bearing 5 is compressed, causing the spring 4 to contract, and the L-shaped crease cutter 113 cuts into the cardboard. When the upper pressure plate 111 moves upward, the spring 4 drives the ball bearing 5 upward, disengaging the cardboard from the L-shaped crease cutter 113 and preventing the cardboard from sticking to the cutter. To ensure the cardboard moves smoothly above the L-shaped crease cutter 113, the top height of the ball bearing 5 is higher than or equal to the top height of the L-shaped crease cutter 113. This facilitates cardboard entry and ensures stable crease cutting by the cardboard conveyor.

[0029] To accommodate different sizes of cardboard, the creasing mechanism 11 is adjustable in both longitudinal and transverse directions on the frame. Specifically, multiple upper pressure plates 111 are divided into two groups longitudinally, with each group of upper pressure plates 111 slidably mounted on a first longitudinal track. Each upper pressure plate 111 moves back and forth on the first longitudinal track via its respective upper slider. The first longitudinal track is mounted on a first transverse track via a first slider. The first longitudinal track carries the upper pressure plates 111 and moves them left and right along the first transverse track, allowing the four groups of upper pressure plates 111 to adjust their positions according to the cardboard size to accommodate different specifications. Multiple lower creasing blades 112 are divided into two groups longitudinally, with each group of lower creasing blades 112 slidably mounted on a second longitudinal track. Each lower creasing blade 112 moves back and forth on the second longitudinal track via its respective lower slider. The second longitudinal track is connected to a second transverse track via a lower slider, allowing the second longitudinal track to carry the lower creasing blades 112 and move them back and forth, allowing the four groups of lower creasing blades 112 to adjust according to the cardboard size.

[0030] Working principle: According to the cardboard specifications, adjust the position of the upper pressure plate 111 and the lower pressure knife plate 112 so that the four pressure mechanisms 11 correspond to the four corners of the cardboard respectively.

[0031] The constraint conveying mechanism uses adsorption or clamping to transfer the cardboard over the surface of the ball bearing 5 to the space between the upper pressure plate 111 and the lower crease cutter plate 112. After the cardboard reaches the crease station, the upper pressure plate 111 descends to press the cardboard onto the lower crease cutter plate 112. The L-shaped crease cutter 113 creates an L-shaped cut on the cardboard. Then, the upper pressure plate 111 moves upward, and the elastic force generated by the spring 4 connected to the ball bearing 5 drives the ball bearing 5 upward, lifting the two sides of the cardboard in contact with the ball bearing 5 and disengaging it from the L-shaped crease cutter 113. This ensures that the cardboard can be smoothly conveyed after crease. The middle part of the cardboard remains unchanged because it is adsorbed or clamped. The constraint conveying mechanism then sends the crease-pressed cardboard into the subsequent slotting process.

[0032] See Figure 8 The present invention also discloses a cardboard slotting machine, which includes a correction device 6, the aforementioned four-corner creasing device 1, and a cardboard slotting device 7. The four-corner creasing device 1 is connected between the correction device 6 and the cardboard slotting device 7. The correction device 6 is used to correct the position of the cardboard, the cardboard slotting device 7 is used to slot the cardboard, and its slotting surface is the upper surface of the cardboard. The four-corner creasing device 1 creasing the lower surface of the cardboard. The two work together to separate the four corners of the cardboard from the cardboard body to form a box blank. The correction device 6 and the cardboard slotting device 7 are prior art and will not be described in detail here.

[0033] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" 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, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A four-corner creasing device for a cardboard slotting machine, characterized in that: It includes a constrained conveying mechanism and four creasing mechanisms (11) respectively located at the four corners of the cardboard, and the four creasing mechanisms operate synchronously; The constraint conveying mechanism includes a conveying plane for conveying the constrained cardboard, the conveying plane passing through the creasing station. The pressing mechanism (11) is arranged at the pressing station, and the pressing mechanisms (11) are arranged in pairs on both sides of the longitudinal direction of the conveying plane. The creasing mechanism (11) includes an upper pressure plate (111) and a lower creasing blade plate (112). The upper pressure plate (111) and the lower creasing blade plate (112) are arranged opposite each other. The lower creasing blade plate (112) is provided with an L-shaped creasing blade (113). The upper pressure plate (111) is connected to the lifting drive mechanism. When the upper pressure plate (111) presses down, it cooperates with the L-shaped creasing blade (113) on the lower creasing blade plate (112) to press out an L-shaped creasing line on the cardboard. The wire pressing mechanism (11) can be adjusted longitudinally and laterally on the frame; Multiple upper pressure plates (111) are divided into two groups along the longitudinal direction. Each group of upper pressure plates (111) is slidably disposed on the first longitudinal track. The first longitudinal track is disposed on the first transverse track by the first slider. Multiple pressure cutter plates (112) are divided into two groups along the longitudinal direction. Each group of pressure cutter plates (112) is slidably set on the second longitudinal track. The second longitudinal track is connected to the second transverse track through a sliding block.

2. The four-corner creasing device for a cardboard slotting machine according to claim 1, characterized in that: The lower crease cutter plate (112) includes a cutter holder with a protrusion (112a). The top surface of the protrusion (112a) forms a depth limiting plane (112b). The blade of the L-shaped crease cutter (113) protrudes beyond the depth limiting plane (112b) at a height not exceeding half the thickness of the cardboard.

3. The four-corner creasing device for a cardboard slotting machine according to claim 2, characterized in that: The blade holder is provided with several mounting holes (3) for installing springs (4). A ball bearing (5) is connected to the top of the spring (4). The ball bearing (5) protrudes from the mounting hole (3) and contacts the lower surface of the cardboard.

4. The four-corner creasing device for a cardboard slotting machine according to claim 3, characterized in that: The height of the top of the ball (5) is higher than the height of the top of the L-shaped crimping knife (113), or the height of the top of the ball (5) is the same as the height of the top of the L-shaped crimping knife (113).

5. The four-corner creasing device for a cardboard slotting machine according to claim 1, characterized in that: The constrained conveying mechanism includes a clamping conveyor belt (21), which includes a top belt and a bottom belt, and the conveying plane is disposed between the bottom belt and the top belt.

6. The four-corner creasing device for a cardboard slotting machine according to claim 1, characterized in that: The constrained conveying mechanism includes an adsorption conveyor belt (22), and the conveying plane is disposed on the adsorption surface of the adsorption conveyor belt (22) in contact with the material.

7. A cardboard slotting machine, characterized in that: It includes a web guiding device (6), a four-corner creasing device (1) according to any one of claims 1-6, and a cardboard slotting device (7), wherein the four-corner creasing device (1) is connected between the web guiding device (6) and the cardboard slotting device (7).

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