CN220995596U - Box throwing machine and paperboard bending device thereof - Google Patents

Abstract

The utility model discloses a box throwing machine and a paperboard bending device thereof, and relates to the technical field of food packaging machinery, wherein the box throwing machine comprises a slotting wheel set and a bending wheel set, the slotting wheel set comprises a rotatable upper grooved wheel and a rotatable lower slotting wheel, a plurality of slotting sheets are annularly distributed in the middle of the wheel surface of the upper grooved wheel, and an avoidance groove for avoiding the slotting sheets is formed in the middle of the wheel surface of the lower grooved wheel; the bending wheel group comprises an upper bending wheel and a lower bending wheel which are rotatable, the upper bending wheel comprises an inner small wheel and an outer large wheel, the lower bending wheel is matched with the inner small wheel of the upper bending wheel, and a part of the paperboard is pressed between the lower bending wheel and the inner small wheel of the upper bending wheel. The paperboard bending device can reduce bending difficulty of the paperboard, and the shape of the paperboard can be maintained more easily after the paperboard is bent. The utility model also discloses a box throwing machine comprising the paperboard bending device, and the box throwing machine has the same beneficial effects as those of the paperboard bending device.

Description

Box throwing machine and paperboard bending device thereof

Technical Field

The utility model relates to the technical field of food packaging machinery, in particular to a box throwing machine and a paperboard bending device thereof.

Background

At present, the fine dried noodles are packaged by a paper bag to a plastic bag, and the plastic bag is formed by packaging a plurality of paper sheets, but because the outer package is soft, the whole appearance of the fine dried noodles is not smooth enough by the paper sheets, and the outer surface of a plastic box is also not smooth after the package, so that the whole appearance of the packaged fine dried noodles is not attractive and easy to deform, and a packaged object cannot be well protected, the inner lining paper box is covered on the paper sheets, and then the plastic box is required to be packaged.

Most of lining cartons in the related art rely on manual folding, and mechanical equipment is adopted to simply fold paper holders, but the folding is only to press a crease on a paperboard, the folding of the paperboard is not easy, and the shape of the folded paperboard is not easy to keep.

In summary, how to effectively solve the problems that the liner paper box for the paper-handle noodle plastic box package is not easy to fold and the shape is not easy to keep after folding is a problem which needs to be solved by the people skilled in the art at present.

Disclosure of utility model

The utility model aims to provide a paperboard bending device which can reduce the bending difficulty of a paperboard and enable the paperboard to be easier to maintain shape after being bent; another object of the present utility model is to provide a box feeder comprising the above paperboard bending device, which has the same advantageous effects as the paperboard bending device.

In order to solve the technical problems, the utility model provides the following technical scheme:

A paperboard bending device comprises a slotting wheel set and a bending wheel set,

The slotting wheel set comprises a rotatable upper slotting sheave and a rotatable lower slotting wheel, a plurality of slotting sheets are annularly distributed in the middle of the wheel surface of the upper slotting sheave, and an avoiding groove for avoiding the slotting sheets is formed in the middle of the wheel surface of the lower slotting sheave;

The bending wheel group comprises an upper bending wheel and a lower bending wheel which are rotatable, the upper bending wheel comprises an inner small wheel and an outer large wheel, the lower bending wheel is matched with the inner small wheel of the upper bending wheel, and a part of the paperboard is pressed between the lower bending wheel and the inner small wheel of the upper bending wheel.

Optionally, the upper grooved wheel and the lower grooved wheel are provided with a left grooved wheel and a right grooved wheel, the upper bending wheel and the lower bending wheel are provided with a left bending wheel and a right bending wheel, and the distances between the left grooved wheel and the right grooved wheel are the same as the distances between the left bending wheel and the right bending wheel.

Optionally, the upper slotting wheel comprises a first wheel, a second wheel and slotting wheel sheets fixedly clamped between the first wheel and the second wheel, and a plurality of slotting sheets are annularly distributed on the slotting wheel sheets.

Optionally, the plurality of slotted plates are annularly and uniformly distributed on the circumferential surface of the slotted plate.

Optionally, the lower slotting wheel comprises a third wheel and a fourth wheel, the third wheel and the fourth wheel are fixedly connected, and a gap between the third wheel and the fourth wheel forms the avoidance slot.

Optionally, the inner small wheel and the outer large wheel of the upper bending wheel are integrally formed.

Optionally, the upper and lower sheaves are of equal diameter,

The diameter of the lower bending wheel is equal to that of the inner small wheel of the upper bending wheel.

Optionally, the slotting piece is a strip blade

Optionally, the cardboard bending device still includes bending actuating mechanism, bending actuating mechanism includes first drive shaft, second drive shaft, first drive shaft is connected with the transmission of second drive shaft, first drive shaft pass through the chain simultaneously with lower division sheave and lower bending wheel transmission are connected, the second drive shaft pass through the chain simultaneously with upward division sheave and upward bending wheel transmission are connected.

The utility model also provides a box feeder, which comprises a paperboard bending device, and the paperboard bending device is specifically any paperboard bending device.

The paperboard bending device has the beneficial effects that the paperboard bending device comprises the grooving wheel set and the bending wheel set, and the paperboard firstly enters the grooving wheel set for grooving and then enters the bending wheel set for bending. The slotting wheel set comprises an upper slotting sheave and a lower slotting sheave which are arranged up and down, and the axes of the upper slotting sheave and the lower slotting sheave are arranged on a vertical surface. A gap is formed between the upper grooved pulley and the lower grooved pulley, the rotation directions of the upper grooved pulley and the lower grooved pulley are opposite, the upper grooved pulley and the lower grooved pulley relatively rotate inwards, and the paper board enters from the gap between the inlet ends of the upper grooved pulley and the lower grooved pulley and passes out from the outlet end. A plurality of slotting sheets are distributed in the middle of the wheel surface of the upper grooved wheel, and are vertical to the wheel surface of the upper grooved wheel along the annular circumferential direction of the wheel surface of the upper grooved wheel.

The middle part of the wheel surface of the lower grooved wheel is provided with an avoidance groove, and the position, the shape and the size of the avoidance groove are matched with those of the grooved sheet. When the upper grooved wheel and the lower grooved wheel relatively rotate inwards, the avoidance groove avoids the grooved sheet, so that the grooved sheet cuts the paper board, and the cut paper board falls into the avoidance groove. That is, when the paper board passes through the slotting sheet and avoids the positions of the slots in the process that the paper board enters the gap between the upper slotting wheel and the lower slotting wheel, the end cutting edge of the slotting sheet stamps the corresponding position of the paper board into a slot.

The plurality of slotting sheets are spaced, and a paperboard passes through the plurality of slotting sheets to be slotting in the forward moving process, so that a row of slotting is reserved on the paperboard along the length direction. The spacing between the slotting sheets is moderate and too dense, so that the strength of the paperboard is reduced; too sparse, the folds are not easy to maintain shape after bending.

Simultaneously, the bending wheel group comprises an upper bending wheel and a lower bending wheel which are arranged up and down, and the axes of the upper bending wheel and the lower bending wheel are arranged on a vertical surface. The upper bending wheel and the lower bending wheel are provided with gaps, the rotation directions of the upper bending wheel and the lower bending wheel are opposite, the upper bending wheel and the lower bending wheel relatively rotate inwards, and the paperboard enters from the gaps of the inlet ends of the upper bending wheel and the lower bending wheel and passes out from the outlet end.

The upper bending wheel comprises an inner small wheel and an outer large wheel, the lower bending wheel is matched with the inner small wheel of the upper bending wheel, a gap is formed between the lower bending wheel and the inner small wheel of the upper bending wheel in the circumferential direction, a part of the paperboard is pressed in the middle gap between the lower bending wheel and the inner small wheel of the upper bending wheel, namely, the paperboard enters from the inlet end of the gap between the lower bending wheel and the inner small wheel of the upper bending wheel and penetrates out from the outlet end. And the clearance between the lower bending wheel and the inner small wheel is smaller than the radius difference between the inner small wheel and the outer large wheel, namely the lower bending wheel and the outer large wheel have an overlapping area.

The outer end surfaces of the inner small wheels of the lower bending wheel and the upper bending wheel are provided with intervals, and the sizes of the intervals are slightly thicker than the thickness of the paperboard. Because the outer end face of the inner small wheel is attached to the inner end face of the outer large wheel, the interval is the interval between the outer large wheel end faces of the lower bending wheel and the upper bending wheel, when the paperboard passes through the gap between the inner small wheel of the lower bending wheel and the gap between the inner small wheel of the upper bending wheel, the side plate of the paperboard is bent at the end face of the lower bending wheel, the bending part enters the interval between the lower bending wheel and the outer large wheel end face, and the side edge of the paperboard is extruded by the interval between the lower bending wheel and the outer large wheel end face to form a crease. The positions of the crease lines of the slotting wheel set and the bending wheel set are overlapped.

According to the paperboard bending device provided by the utility model, the paperboard passes through the space between the upper grooving wheel and the lower grooving wheel of the grooving wheel set, the grooves are formed on the paperboard to-be-bent line at intervals, and then the paperboard passes through the space between the upper bending wheel and the lower bending wheel of the bending wheel set, so that folds are formed by bending along the grooves, the bending difficulty of the paperboard can be reduced, and the shape of the paperboard can be maintained more easily after bending.

The utility model also provides a box feeder, which comprises a paperboard bending device, and the paperboard bending device is specifically any paperboard bending device. Because the paperboard bending device has the technical effects, the box throwing machine with the paperboard bending device also has the corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a front view of a bending device for a cardboard box feeder according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of a part of the structure of the cardboard bending device used on the box-throwing machine;

FIG. 3 is a schematic view of the structure of the cardboard after bending;

FIG. 4 is an enlarged schematic view of the portion B of FIG. 2;

FIG. 5 is a schematic structural view of a grooved wheel set;

fig. 6 is a schematic structural diagram of a bending wheel set.

The figures are marked as follows:

The machine frame 1, a second conveying slide bar 2, a paperboard bending device 3, a slotting wheel set 31, a bending wheel set 32, a first driving shaft 33, a second driving shaft 34, an upper slotting wheel 311, a lower slotting wheel 312, an upper bending wheel 321, a lower bending wheel 322, a slotting wheel sheet 3111, a first wheel 3112, a second wheel 3113, a avoidance slot 3123, an outer large wheel 3211 and an inner small wheel 3212.

Detailed Description

The utility model has the core that the paperboard bending device is provided, the bending difficulty of the paperboard can be reduced, and the shape of the paperboard can be maintained more easily after being bent; another core of the utility model is to provide a box feeder comprising the paperboard bending device, which has the same beneficial effects as the paperboard bending device.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 6, fig. 1 is a schematic front view of a cardboard bending device according to an embodiment of the present utility model; FIG. 2 is a schematic perspective view of a part of the structure of the cardboard bending device used on the box-throwing machine; FIG. 3 is a schematic view of the structure of the cardboard after bending; FIG. 4 is an enlarged schematic view of the portion B of FIG. 2; FIG. 5 is a schematic structural view of a grooved wheel set; fig. 6 is a schematic structural diagram of a bending wheel set.

In one embodiment, the paperboard bending device provided by the utility model comprises a slotting wheel set 31 and a bending wheel set 32,

The slotting wheel set 31 comprises an upper slotting wheel 311 and a lower slotting wheel 312 which are rotatable, a plurality of slotting sheets are annularly distributed at the middle part of the wheel surface of the upper slotting wheel 311, and an avoidance slot 3123 for avoiding the slotting sheets is arranged at the middle part of the wheel surface of the lower slotting wheel 312;

The bending wheel set 32 comprises an upper bending wheel 321 and a lower bending wheel 322 which are rotatable, the upper bending wheel 321 comprises an inner small wheel 3212 and an outer large wheel 3211, the lower bending wheel 322 is matched with the inner small wheel 3212 of the upper bending wheel 321, and a part of the paperboard is pressed between the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321.

In the structure, the paperboard bending device 3 is arranged on the frame 1 and comprises a grooving wheel set 31 and a bending wheel set 32, and the paperboard firstly enters the grooving wheel set 31 for grooving and then enters the bending wheel set 32 for bending.

The grooving wheel set 31 comprises an upper grooving wheel 311 and a lower grooving wheel 312 which are arranged up and down, and the axes of the upper grooving wheel and the lower grooving wheel are on a vertical surface. The upper slotting wheel 311 and the lower slotting wheel 312 have a gap therebetween, the upper slotting wheel 311 and the lower slotting wheel 312 rotate in opposite directions and rotate relatively inwards, and the paper board enters from the gap between the inlet ends of the upper slotting wheel 311 and the lower slotting wheel 312 and passes out from the outlet end.

A plurality of slotting sheets are distributed in the middle of the wheel surface of the upper slotting wheel 311, and are vertical to the wheel surface of the slotting wheel 311 along the annular circumferential direction of the wheel surface of the upper slotting wheel 311. Alternatively, the slotting blade may be a circular blade, a long blade, the length direction of which is along the circumferential direction of the upper slotting wheel 311.

The middle part of the wheel surface of the lower slotting wheel 312 is provided with an avoidance slot 3123, and the position, shape and size of the avoidance slot 3123 are matched with those of the slotting piece. When the upper grooved wheel 311 and the lower grooved wheel 312 are rotated relatively inward, the escape groove 3123 escapes from the grooved sheet so that the grooved sheet cuts the cardboard, and the cut cardboard falls into the escape groove 3123. That is, during the process of entering the gap between the upper grooving wheel 311 and the lower grooving wheel 312, the end cutting edge of the grooving sheet stamps the corresponding position of the cardboard into a groove as the cardboard passes the grooving sheet and the position of avoiding the groove 3123.

The plurality of slotting sheets are spaced, and a paperboard passes through the plurality of slotting sheets to be slotting in the forward moving process, so that a row of slotting is reserved on the paperboard along the length direction. The spacing between the slotting sheets is moderate and too dense, so that the strength of the paperboard is reduced; too sparse, the folds are not easy to maintain shape after bending.

Meanwhile, the bending wheel set 32 comprises an upper bending wheel 321 and a lower bending wheel 322 which are arranged up and down, and the axes of the upper bending wheel and the lower bending wheel are on a vertical plane. A gap is formed between the upper bending wheel 321 and the lower bending wheel 322, the rotation directions of the upper bending wheel 321 and the lower bending wheel 322 are opposite, the paperboard relatively rotates inwards, and enters from the gap of the inlet ends of the upper bending wheel 321 and the lower bending wheel 322 and passes out from the outlet end.

The upper bending wheel 321 comprises an inner small wheel 3212 and an outer large wheel 3211, the lower bending wheel 322 is matched with the inner small wheel 3212 of the upper bending wheel 321, the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321 have gaps in the circumferential direction, a part of the paperboard is pressed in the gap between the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321, namely, the paperboard enters from the inlet end of the gap between the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321 and penetrates out from the outlet end. The gap between lower bending wheel 322 and inner small wheel 3212 is smaller than the difference in radius between inner small wheel 3212 and outer large wheel 3211, that is, the overlapping area between lower bending wheel 322 and outer large wheel 3211.

The lower bending wheel 322 is spaced from the outer end surface of the inner small wheel 3212 of the upper bending wheel 321 by a distance slightly thicker than the thickness of the cardboard, for example, 0.1mm thicker than the thickness of the cardboard. Because the outer end face of the inner small wheel 3212 is attached to the inner end face of the outer large wheel 3211, the interval is that between the lower bending wheel 322 and the outer large wheel 3211 end face of the upper bending wheel 321, when the paperboard passes through the gap between the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321, the side plate of the paperboard is bent at the end face of the lower bending wheel 322, the bending part enters the interval between the lower bending wheel 322 and the outer large wheel 3211 end face, and the interval between the lower bending wheel 322 and the outer large wheel 3211 end face extrudes the side edge of the paperboard to form a crease. The positions of the notches opened by the notch wheel set 31 and the folds bent by the bending wheel set 32 coincide.

According to the paperboard bending device provided by the utility model, firstly, the paperboard passes through the space between the upper grooving wheel 311 and the lower grooving wheel 312 of the grooving wheel set 31, grooves are formed on the paperboard to-be-bent line at intervals, and then the paperboard passes through the space between the upper bending wheel 321 and the lower bending wheel 322 of the bending wheel set 32, and is bent to form folds along the grooves, so that the bending difficulty of the paperboard can be reduced, and the shape of the paperboard can be maintained more easily after being bent.

The above-mentioned cardboard bending device is only a preferred scheme, specifically, but not limited to, on this basis, the device can be adjusted according to the actual needs, so as to obtain different embodiments, the upper grooving wheel 311 and the lower grooving wheel 312 are provided with left and right grooving wheels, the upper bending wheel 321 and the lower bending wheel 322 are provided with left and right bending wheels, and the distances between the left and right grooving wheels and the left and right bending wheels are the same.

In some embodiments, the upper grooving wheel 311 and the lower grooving wheel 312 are provided with a left grooving wheel and a right grooving wheel, a row of grooving is formed on the left side and the right side of the paper board, the paper board enters the gap between the upper grooving wheel 311 and the lower grooving wheel 312 at a time, and two grooving is formed, so that the working efficiency is improved.

The upper bending wheel 321 and the lower bending wheel 322 are respectively provided with a left bending wheel and a right bending wheel, a crease is respectively formed on the left side and the right side of the paperboard, the paperboard enters a gap between the upper bending wheel 321 and the lower bending wheel 322 at one time, and two creases are formed by bending, so that the working efficiency is improved.

The distance between the left grooved wheel and the right grooved wheel is the same as that between the left bending wheel and the right bending wheel, so that the slotting of the left grooved wheel and the right grooved wheel and the crease positions of the left bending wheel and the right bending wheel are coincident, and the alignment difficulty is reduced when the paper board is placed.

On the basis of the above-described respective embodiments, the upper grooved wheel 311 includes a first wheel 3112, a second wheel 3113, and a grooved wheel sheet 3111 fixedly sandwiched between the first wheel 3112 and the second wheel 3113, a plurality of grooved sheets being annularly distributed on the grooved wheel sheet 3111.

In some embodiments, upper grooved wheel 311 includes a first wheel 3112, a second wheel 3113, and grooved wheel plates 3111, with grooved wheel plates 3111 fixedly clamped between first wheel 3112 and second wheel 3113, with a plurality of grooved plates annularly distributed on grooved wheel plates 3111. The first wheel 3112, the second wheel 3113 and the grooved wheel piece 3111 can be integrally formed, the strength is high, no connecting gap exists, the integrity is good, and the matching is smoother.

The first wheel 3112, the second wheel 3113 and the grooved wheel sheet 3111 can also be processed separately, and the structure is simple and easy to process. After single processing, the assembly can be assembled through welding connection, firm connection can also be realized through bolt connection, detachable connection can be realized, single parts can be replaced, and cost is reduced.

On the basis of the above embodiments, a plurality of slotted plates are annularly and uniformly distributed on the circumferential surface of the slotted wheel plate 3111.

In some embodiments, the plurality of slotting sheets are uniformly distributed, the spacing between the slotting sheets is equal, the slotting distance on the paperboard is the same, the stress distribution of the paperboard is more uniform, the bending difficulty of the paperboard is reduced, and the shape of the paperboard is easier to keep after bending.

On the basis of the above-described respective embodiments, the lower grooved wheel 312 includes a third wheel and a fourth wheel, which are fixedly coupled, and a gap between the third wheel and the fourth wheel forms the escape groove 3123.

In some embodiments, the lower grooved wheel 312 includes a third wheel and a fourth wheel, which are fixedly connected by welding or bolts, etc., and a gap is formed between the third wheel and the fourth wheel to form an avoidance groove 3123, which is of a split design, so as to facilitate processing; the lower grooved wheel 312 can be integrally processed, a circle of avoidance groove 3123 is milled in the middle of the lower grooved wheel 312, and the overall strength is higher.

In another more reliable embodiment, on the basis of any of the above embodiments, the inner small wheel 3212 and the outer large wheel 3211 of the upper bending wheel 321 are integrally formed.

In some embodiments, the inner small wheel 3212 and the outer large wheel 3211 of the upper bending wheel 321 are integrally arranged, which is reasonable in structure, convenient to process, and capable of avoiding gap jam. The inner small wheel 3212 and the outer large wheel 3211 can be split, and are connected through welding, so that the processing is more convenient.

In another more reliable embodiment, on the basis of any one of the above embodiments, the diameters of the upper slotting wheel 311 and the lower slotting wheel 312 are equal, the diameters of the lower bending wheel 322 and the inner small wheel 3212 of the upper bending wheel 321 are equal, the rotation speeds are synchronous, the rotation time is the same for one circle, and the coordination is achieved.

In another more reliable embodiment, the slotted blade is a strip blade based on any of the embodiments described above.

In some embodiments, the slotted plate is not limited in shape, and may be a round blade, a long blade, or any other suitable shape. Optionally, the slotting piece is a strip blade, the length of the slotting piece is far greater than the width along the circumferential direction of the upper slotting wheel 311, the corresponding hole is a strip hole, the slotting piece is bent along the long axis of the strip hole, the bending length of the paperboard is reduced, the bending difficulty of the paperboard is reduced, and the paperboard is easier to maintain in shape after being bent.

In another more reliable embodiment, on the basis of any one of the above embodiments, the board bending device further includes a bending driving mechanism, where the bending driving mechanism includes a first driving shaft 33 and a second driving shaft 34, the first driving shaft 33 is in transmission connection with the lower slotting wheel 312 and the lower bending wheel 322 at the same time through a chain, and the second driving shaft 34 is in transmission connection with the upper slotting wheel 311 and the upper bending wheel 321 at the same time through a chain. Therefore, the upper grooving wheel 311 and the lower grooving wheel 312 can be driven to reversely rotate by one power, and the upper bending wheel 321 and the lower bending wheel 322 are driven to reversely rotate at the same time, so that the structure is simple, and the rotation synchronism is higher.

The conveying slide bars on the box throwing machine are disconnected at the positions of the lower grooved wheel 312 and the lower bending wheel 322, a first conveying slide bar tangent to the lower grooved wheel 312 is arranged in front of the lower grooved wheel 312, a second conveying slide bar 2 tangent to the lower bending wheel 322 is arranged behind the lower bending wheel 322, and the paper board is conveyed through the first conveying slide bar and the second conveying slide bar 2. Alternatively, the first conveying slide bar comprises two parallel-arranged L-shaped bars, and the second conveying slide bar 2 comprises two parallel-arranged "1" shaped bars.

Based on the paperboard bending device provided in the embodiment, the utility model further provides a box throwing machine, which comprises a paperboard bending device, wherein the paperboard bending device is any one of the paperboard bending devices in the embodiment. The box throwing machine adopts the paperboard bending device in the embodiment, so the box throwing machine has the beneficial effects as shown in the embodiment. The structure of other parts of the box feeder is referred to the prior art, and will not be described herein.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The box throwing machine and the paperboard bending device provided by the utility model are described in detail. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A paperboard bending device is characterized by comprising a slotting wheel set (31) and a bending wheel set (32),

The slotting wheel set (31) comprises an upper slotting wheel (311) and a lower slotting wheel (312) which are rotatable, a plurality of slotting sheets are annularly distributed at the middle part of the wheel surface of the upper slotting wheel (311), and an avoidance groove (3123) for avoiding the slotting sheets is formed at the middle part of the wheel surface of the lower slotting wheel (312);

The bending wheel set (32) comprises an upper bending wheel (321) and a lower bending wheel (322) which are rotatable, the upper bending wheel (321) comprises an inner small wheel (3212) and an outer large wheel (3211), the lower bending wheel (322) is matched with the inner small wheel (3212) of the upper bending wheel (321), and a part of the paperboard is pressed between the lower bending wheel (322) and the inner small wheel (3212) of the upper bending wheel (321).

2. The paperboard bending device according to claim 1, wherein the upper grooved wheel (311) and the lower grooved wheel (312) are provided with a left grooved wheel and a right grooved wheel, the upper bending wheel (321) and the lower bending wheel (322) are provided with a left bending wheel and a right bending wheel, and the distances between the left grooved wheel and the right grooved wheel are the same as the distances between the left bending wheel and the right bending wheel.

3. Cardboard bending device according to claim 2, characterized in that the upper grooved wheel (311) comprises a first wheel (3112), a second wheel (3113) and a grooved wheel sheet (3111) fixedly clamped between the first wheel (3112) and the second wheel (3113), a plurality of grooved sheets being annularly distributed on the grooved wheel sheet (3111).

4. A board bending device according to claim 3, wherein the plurality of slotted sheets are annularly and evenly distributed on the circumference of the slotted wheel sheet (3111).

5. The board bending device according to claim 4, characterized in that the lower grooved wheel (312) comprises a third wheel and a fourth wheel, which are fixedly connected, and that a gap between the third wheel and the fourth wheel forms the relief groove (3123).

6. Cardboard bending device according to any of claims 1-5, characterized in that the inner small wheel (3212) and the outer large wheel (3211) of the upper bending wheel (321) are integrally formed.

7. Cardboard bending device according to any of claims 1-5, characterized in that the diameters of the upper grooved wheel (311) and the lower grooved wheel (312) are equal,

The diameter of the lower bending wheel (322) is equal to that of the inner small wheel (3212) of the upper bending wheel (321).

8. A board bending apparatus as claimed in any one of claims 1 to 5, wherein the slotted blade is an elongate blade.

9. A board bending device according to any one of claims 1-5, characterized in that the board bending device further comprises a bending drive mechanism comprising a first drive shaft (33), a second drive shaft (34), the first drive shaft (33) being in driving connection with the lower grooving wheel (312) and the lower bending wheel (322) simultaneously by means of a chain, the second drive shaft (34) being in driving connection with the upper grooving wheel (311) and the upper bending wheel (321) simultaneously by means of a chain.

10. A box feeder comprising a board bending device, characterized in that the board bending device is in particular a board bending device according to any one of claims 1 to 9.