CN219671976U - Mould pressing chamfer panel and processing equipment - Google Patents

Abstract

The utility model provides a die-pressing chamfer plate and processing equipment, and relates to the technical field of decoration. The die pressing chamfering plate processing device comprises a plate main body, wherein the plate main body is provided with a first plate surface and a second plate surface in the thickness direction, the first plate surface is provided with a plurality of first grooves formed by pressing through a pressing roller, the plurality of first grooves are arranged at intervals in parallel in the first direction, each first groove extends in a second direction perpendicular to the first direction, and two ends of each first groove extend to two side surfaces of the plate main body in the first direction respectively; the middle part of the groove bottom wall of the first groove is provided with a pre-cutting part which extends in the second direction; a plurality of second grooves formed by pressing with a pressing roller are formed in the second plate surface. The plate has light weight, can simplify the floor processing steps, saves materials and reduces the processing and manufacturing cost.

Description

Mould pressing chamfer panel and processing equipment

Technical Field

The utility model relates to the technical field of decoration, in particular to a die-pressing chamfering plate and processing equipment.

Background

PVC floors are increasingly popular in recent years, but China is the major PVC floor processing export country, ocean transportation is most popular, the cost is mainly the raw material price and the transportation price at present, and the influence of international environment on raw material futures is great, thus the PVC floors belong to uncontrollable factors. On the other hand, the cost of transportation is mainly affected, and the cost of transportation is mainly determined by the weight of the PVC floor. Meanwhile, the plates are generally cut to form a plurality of floors, and the floors are spliced to form a floor decoration structure. In the prior art, after the plate processing is finished, a protective layer such as a wear-resistant layer, a paint layer and the like is arranged on the surface of the plate, and in order to avoid that a floor obtained by cutting the plate forms a height difference between adjacent floors when the floor is spliced, a chamfer is generally arranged on the side of the floor. The chamfer is typically a bevel, obtained by cutting the material of the side portion of the floor. Therefore, the original protective layer on the surface of the plate is damaged, the protective layer needs to be arranged at the chamfer position again, the working procedure is complex, the combination property of the protective layer and the original protective layer is poor, the quality of the floor is reduced, and the manufacturing cost of the floor is improved.

Disclosure of Invention

The utility model aims to provide a die-pressing chamfer plate and processing equipment, which can simplify the processing steps of a floor, save materials and reduce the processing and manufacturing cost.

Embodiments of the present utility model are implemented as follows:

in a first aspect, the present utility model provides a stamped chamfer panel comprising:

the plate comprises a plate body, wherein the plate body is provided with a first plate surface and a second plate surface in the thickness direction, the first plate surface is provided with a plurality of first grooves formed by pressing through a pressing roller, the plurality of first grooves are arranged at intervals in parallel in the first direction, each first groove extends in a second direction perpendicular to the first direction, and two ends of each first groove extend to two side surfaces of the plate body in the first direction respectively; the middle part of the groove bottom wall of the first groove is provided with a pre-cutting part which extends in the second direction; a plurality of second grooves formed by pressing with a pressing roller are formed in the second plate surface.

In an alternative embodiment, the cross-sectional profile of the first groove is arc-shaped or polyline-shaped, and the cross-section is a plane perpendicular to the extending direction of the first groove.

According to the structure, the cross section profile of the first groove is arc-shaped or folded, so that the shape is regular, the processing and the manufacturing are convenient, and the pre-cutting part is also convenient to form at the middle part of the first groove.

In an alternative embodiment, the cross section profile of the first groove is in a circular arc shape, the central angle of the circular arc is set to be 50-70 degrees, the width of the notch of the first groove in the first direction is 8-12 mm, and the depth of the first groove in the third direction is 0.8-1.2 mm; wherein the third direction is perpendicular to a plane defined by the first direction and the second direction.

By adopting the method, the first groove is processed into the arc-shaped groove, and the related parameters of the first groove are set, so that the processing quality of the first groove can be ensured. When the plate main body is cut at the pre-cutting part, a plurality of independent sub-blocks, namely floors, are formed, chamfer angles are formed at two opposite sides of the floors, and when the floors are spliced, the chamfer angles of the two corresponding floors are spliced to form a first groove, the groove wall of the first groove is an arc surface, no dead angle exists, and cleaning of impurities such as dust is facilitated. Simultaneously, cut panel at the pre-cut part of first recess, two floors that the first recess department formed after separating all have the chamfer, do not need to carry out chamfer processing to the floor again, do not need to destroy original protective layer, save the step of resetting the protective layer in chamfer department, simplify manufacturing process, save material, reduce manufacturing cost.

In an alternative embodiment, the second groove is aligned with the first groove in the extending direction, and the first groove and the second groove are staggered in the first direction.

According to the structure, the extending directions of the first groove and the second groove are consistent, and the processing and the manufacturing are convenient. Because the first groove is staggered with the second groove, the thickness of the plate main body is not easy to change greatly, namely, the position where the thickness of the plate is thinner is not easy to appear, the structural strength of the plate main body is high, and the structural strength of the floor obtained by processing the plate main body is high.

In an alternative embodiment, the pre-cut portion is provided as a protrusion or slit.

By adopting the structure, the pre-cutting part at the middle part of the first groove is convenient to directly obtain, and when the plate main body is used for cutting to obtain the floor, the saw blade is directly aligned to the pre-cutting part, so that the positioning time is saved, and the processing and manufacturing efficiency is improved.

In an alternative embodiment, a color film layer is arranged on the first plate surface of the plate main body, and a wear-resistant layer is arranged on the surface of the color film layer.

By the aid of the color film layer, the attractiveness of the floor can be improved, the surface of the floor can be protected from being scratched by the wear-resistant layer, the service life of the floor is prolonged, and the use cost is reduced.

In a second aspect, the present utility model provides a processing apparatus for forming a stamped chamfer panel of any of the preceding embodiments.

In an alternative embodiment, the processing apparatus includes a frame, a conveying device, a first press roller and a second press roller, the conveying device is mounted on the frame, and the conveying device is used for bearing and conveying the plate along a first direction; the first press roller and the second press roller are arranged in parallel at intervals and are both rotatably arranged on the frame, and a channel for a plate to pass through is formed between the first press roller and the second press roller; the first press roller is provided with a first convex part for forming the first groove, and the second press roller is provided with a second convex part for forming the second groove.

By the aid of the pressing roller, the plate is pressed through the convex part on the pressing roller, so that a groove is formed at the position corresponding to the plate, the groove is formed at one time, processing is convenient and fast, efficiency is high, and cost is low.

In an alternative embodiment, the axis of the first press roll and the axis of the second press roll together determine a reference plane, in the first direction, an included angle between the first convex portion of the first groove adjacent to the first groove and the second groove formed to the reference plane in the rotation direction is a first included angle, an included angle between the second convex portion of the second groove adjacent to the first groove and the second groove formed to the reference plane in the rotation direction is a second included angle, and the angle of the first included angle is not equal to the angle of the second included angle.

By the aid of the structure, the first grooves and the second grooves are staggered, the thickness of the plate is not easy to reduce in transition, and structural strength of the plate is guaranteed.

In an alternative embodiment, the first protrusion is detachably connected to the first press roller, or the second protrusion is detachably connected to the second press roller.

According to the structure, when the shape of the groove on the floor needs to be adjusted, the original convex part can be detached to replace the new convex part with different sizes, so that the structure is suitable for the use requirements of different scenes, the whole press roller does not need to be replaced, and the cost is low.

The embodiment of the utility model has the beneficial effects that:

in summary, the molded chamfer board provided in this embodiment is provided, through processing many first recesses on the first face of board main part, the middle part position of every first recess is provided with the portion of cutting off in advance, in the mode that utilizes the board main part to cut through cutting off in advance to obtain the floor, utilize the saw bit to cut the board main part in advance can, the avris of floor that obtains naturally forms the chamfer structure, first recess in original board main part is divided into two, form into the chamfer structure on two floors respectively promptly, so, do not need to carry out chamfer processing to the floor again, do not need to destroy original protective layer, save the step of resetting the protective layer in the chamfer department, simplify manufacturing process, save material, reduce manufacturing cost. Simultaneously, be provided with many second recesses on the second face, the second recess can play the effect of lightening board main part weight, so, reduces the cost of transportation of product through lightening the weight of unit area, improves product competitiveness.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a molded chamfer plate according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a splicing structure of a floor board according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a first groove according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a processing apparatus according to an embodiment of the present utility model.

Icon:

001-a reference plane; 002-plate material; 100-plate body; 110-a first panel; 120-a second panel; 130-a first groove; 131-convex arc; 132-concave arc; 140-a second groove; 150-a pre-cut section; 160-floor; 161-chamfering; 200-a first press roll; 210-a first protrusion; 300-a second press roll; 310-second protrusions.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. 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.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the prior art, after the processing of the plate 002 is completed, the plate 002 is directly conveyed, and after the plate 002 is conveyed to a destination, the plate 002 is cut according to the requirement, so as to obtain the floor 160. In order to avoid a height difference between adjacent floors 160 when the floors 160 cut out of the plate material 002 are spliced, a chamfer 161 is generally provided at the side of the floor 160. The chamfer 161 is typically a bevel, obtained by cutting the material of the side portion of the floor 160, for example, the chamfer 161 is a 45 degree bevel. When the floor 160 is cut to obtain the chamfer 161, the original protective layer on the surface of the plate 002 is damaged, the protective layer needs to be arranged at the position of the chamfer 161 again, the procedure is complicated, the combination property with the original protective layer is poor, and the quality of the floor 160 is reduced; meanwhile, the protective layer is repeatedly provided, increasing the manufacturing cost of the floor panel 160.

In view of this, the designer provides a die chamfer plate and machining equipment that simplifies the floor 160 manufacturing process, does not require repeated protective layer placement, saves materials, and reduces manufacturing costs.

Referring to fig. 1-2, in the present embodiment, the press-die chamfering plate processing apparatus includes a plate main body 100, the plate main body 100 having a first plate surface 110 and a second plate surface 120 in a thickness direction thereof, the first plate surface 110 being provided with a plurality of first grooves 130 formed by pressing with a press roller 400, the plurality of first grooves 130 being arranged at intervals in parallel in a first direction, each first groove 130 extending in a second direction perpendicular to the first direction, and both ends of each first groove 130 extending to both sides of the plate main body 100 in the first direction, respectively; the middle of the groove bottom wall of the first groove 130 is provided with a pre-cut part 150, the pre-cut part 150 extending in the second direction; the second plate surface 120 is provided with a plurality of second grooves 140 formed by pressing with a pressing roller 400.

With the foregoing in mind, the die chamfer plate provided in this embodiment has at least the following advantages:

by processing a plurality of first grooves 130 on the first plate surface 110 of the plate main body 100, the middle position of each first groove 130 is provided with the pre-cutting part 150, in the process of obtaining the floor 160 by utilizing the plate main body 100 through cutting and cutting, the plate main body 100 is cut along the pre-cutting part 150 by utilizing a saw blade, and the obtained side of the floor 160 naturally forms a chamfer 161 structure, namely the first grooves 130 on the original plate main body 100 are divided into two and respectively formed into the chamfer 161 structures on the two floors 160, so that the chamfer 161 processing on the floor 160 is not needed, the original protective layer is not needed to be damaged, the step of resetting the protective layer at the chamfer 161 is omitted, the manufacturing process is simplified, the materials are saved, and the manufacturing cost is reduced. Meanwhile, a plurality of second grooves 140 are provided on the second plate surface 120, and the second grooves 140 can play a role in reducing the weight of the plate body 100, so that the transportation cost of the product is reduced by reducing the weight of the unit area, and the competitiveness of the product is improved.

The following examples illustrate the detailed structure of the die chamfer plate material of the present utility model.

In this embodiment, alternatively, the plate body 100 is a rectangular plate, the length direction of the plate body 100 is a first direction, the width direction of the plate body 100 is a second direction, and the thickness direction of the plate body 100 is a third direction. The number of first grooves 130 is set as desired and the number of second grooves 140 is set as desired. Meanwhile, the cross-sectional profile of the first groove 130 is circular arc-shaped, wherein the cross-section is a plane perpendicular to the extending direction of the first groove 130, i.e., perpendicular to the second direction. Further, the central angle r of the cross-sectional profile of the first groove 130 is set to 50 ° -70 °, for example, the central angle r of the cross-sectional profile of the first groove 130 is set to 50 °, or the central angle r of the cross-sectional profile of the first groove 130 is set to 60 °, or the central angle r of the cross-sectional profile of the first groove 130 is set to 70 °, or the like. The width of the notch of the first groove 130 in the first direction is 8mm to 12mm, for example, the width of the notch of the first groove 130 in the first direction is 8mm, or the width of the notch of the first groove 130 in the first direction is 10mm; alternatively, the width of the notch of the first groove 130 in the first direction is 12mm or the like. The depth of the first groove 130 in the third direction is 0.8mm to 1.2mm, for example, the depth of the first groove 130 in the third direction is 0.8mm; alternatively, the depth of the first groove 130 in the third direction is 1.0mm; alternatively, the depth of the first groove 130 in the third direction is 1.2mm or the like.

With reference to fig. 3, further, both sides of the notch of the first groove 130 may be configured as an arc, which is a convex arc 131, so that the first groove 130 includes two convex arcs 131 and a concave arc 132 between the two convex arcs 131.

It should be understood that in other embodiments, the cross-sectional profile of the first groove 130 may also be a dogleg shape, etc., and that the circular arc shape is one of arc shapes, and that the cross-sectional profile of the first groove 130 may also be other arc shapes, such as an elliptical arc, etc., which is not intended to be exhaustive in this embodiment. In addition, when the cross-sectional profile of the first groove 130 is a broken line shape, after the pre-cut portion 150 of the plate main body 100 at the middle of the first groove 130 is broken, the chamfer 161 formed at the side of the floor 160 is a bevel.

It should be noted that, when the first groove 130 is configured as an arc groove, after the adjacent floors 160 are spliced, an arc groove is formed at the joint, and the groove wall of the arc groove is a smooth arc surface, so that no dead angle exists, and cleaning of impurities such as dust is facilitated.

Alternatively, the second groove 140 may be an arc groove, a square groove, or the like, and the second groove 140 may be a through groove, that is, two ends of the second groove 140 in the length direction thereof extend to two opposite sides of the board main body 100, respectively, or an area surrounded by the second groove 140 is located on the second board surface 120. Through setting up second recess 140, can play the effect of alleviateing the weight of board main part 100, and second recess 140 is located second face 120, and when floor 160 used, second face 120 and ground contact, first face 110 expose, because second face 120 does not expose outside, consequently, the shape design of second recess 140 can not influence the use of floor 160, processing as required can.

In this embodiment, the second groove 140 is disposed parallel to the first groove 130, and meanwhile, the first groove 130 and the second groove 140 are disposed in a staggered manner in the first direction. That is, since the first grooves 130 and the second grooves 140 are distributed on the first plate surface 110 and the second plate surface 120, the distance between the first plate surface 110 and the second plate surface 120 is the plate thickness, and since the first grooves 130 and the second grooves 140 are staggered, the bottoms of the first grooves 130 and the second grooves 140 are staggered, the plate main body 100 is not easy to form a thinner position, and the structural strength is high.

Optionally, the pre-cut portion 150 is provided as a protrusion or slit. It should be understood that when the precut section 150 is provided as a protrusion, a recess is provided at a position corresponding to the press roller 400. When the precut section 150 is provided as a slit, a convex portion 410 is provided at a position corresponding to the press roller 400.

In other embodiments, a color film layer is disposed on the first plate surface 110 of the plate main body 100, and a wear-resistant layer is disposed on the surface of the color film layer. The aesthetic property of the plate body 100 can be improved, and at the same time, the probability of the plate body 100 being worn out can be reduced, and the service life can be prolonged.

When the pressing die chamfering plate provided by the embodiment is used for processing the floor 160, the floor 160 does not need to be subjected to chamfering 161 processing, the original protective layer does not need to be damaged, the step of resetting the protective layer at the chamfer 161 is omitted, the manufacturing process is simplified, materials are saved, and the manufacturing cost is reduced. Meanwhile, a plurality of second grooves 140 are provided on the second plate surface 120, and the second grooves 140 can play a role in reducing the weight of the plate body 100, so that the transportation cost of the product is reduced by reducing the weight of the unit area, and the competitiveness of the product is improved.

Referring to fig. 1-4, the present embodiment also provides a processing apparatus for forming the press-molded chamfer plate material of the above embodiment. The processing device comprises a frame (not shown), a conveying device (not shown), a first press roller 200 and a second press roller 300, wherein the conveying device is arranged on the frame and is used for bearing and conveying the plate 002 along a first direction; the first press roller 200 and the second press roller 300 are arranged in parallel at intervals and are both rotatably arranged on the frame, and a channel for the plate 002 to pass through is formed between the first press roller 200 and the second press roller 300; the first pressing roller 200 is provided with a first protrusion 210 for forming the first groove 130, and the second pressing roller 300 is provided with a second protrusion 310 for forming the second groove 140. Meanwhile, the first protrusion 210 is correspondingly provided with a structure of the pre-cut molding portion 150, and the pre-cut molding portion 150 may be formed as a protrusion or a groove. When the plate 002 passes through the passage between the first and second pressing rollers 200 and 300 under the conveyance of the conveying means, the first and second pressing rollers 200 and 300 rotate relative to the plate 002 and press the plate 002, forming the first groove 130 on one plate surface of the plate 002 by the first protrusion 210 and the precut part 150 located at the middle of the first groove 130, and forming the second groove 140 on the other plate surface of the plate 002 by the second protrusion 310. The two plate surfaces of the plate 002 can be processed through the cooperation of the first press roller 200 and the second press roller 300, so that the processing efficiency is improved.

Meanwhile, the axis of the first press roller 200 and the axis of the second press roller 300 together define a reference plane 001, in the first direction, an angle between the first convex portion 210 of the first groove 130 formed adjacent to the first groove 130 and the second groove 140 and the reference plane 001 in the rotation direction thereof is a first angle α, an angle between the second convex portion 310 of the second groove 140 formed adjacent to the first groove 130 and the second groove 140 and the reference plane 001 in the rotation direction thereof is a second angle β, wherein the angle of the first angle α is not equal to the angle of the second angle β, for example, when α=30°, β=60°, the first convex portion 210 and the second convex portion 310 are not simultaneously pressed against the plate 002, so designed that the first groove 130 and the second groove 140 on the plate 002 are mutually staggered.

Optionally, the first protrusion 210 is detachably connected with the first press roll 200, or the second protrusion 310 is detachably connected with the second press roll 300, for example, the first protrusion 210 may be clamped on the first press roll 200, the second protrusion 310 may be clamped on the second press roll 300, when the shape of the groove on the floor 160 needs to be adjusted, the original protrusion 410 may be detached and replaced with a new protrusion 410 with different dimensions, so as to adapt to the use requirements of different scenes without replacing the whole press roll 400, and the cost is low.

It should be understood that the conveying means may be a belt conveyor or the like.

The processing equipment provided by the embodiment is convenient to operate, the plate main body 100 is convenient to process, and the processing and manufacturing cost is low.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A molded chamfer plate, comprising:

the plate comprises a plate body, wherein the plate body is provided with a first plate surface and a second plate surface in the thickness direction of the plate body, the first plate surface is provided with a plurality of first grooves formed by pressing through a pressing roller, the plurality of first grooves are arranged in parallel at intervals in a first direction, each first groove extends in a second direction perpendicular to the first direction, and two ends of each first groove extend to two side surfaces of the plate body in the first direction respectively; a pre-cutting part is arranged in the middle of the groove bottom wall of the first groove, and extends in the second direction; and a plurality of second grooves formed by pressing with a pressing roller are formed in the second plate surface.

2. The molded chamfer plate according to claim 1, wherein:

the cross section profile of the first groove is arc-shaped or broken line-shaped, and the cross section is a plane perpendicular to the extending direction of the first groove.

3. The molded chamfer plate according to claim 2, wherein:

the cross section profile of the first groove is arc-shaped, the central angle of the arc is set to be 50-70 degrees, the width of the notch of the first groove in the first direction is 8-12 mm, and the depth of the first groove in the third direction is 0.8-1.2 mm; wherein the third direction is perpendicular to a plane defined by the first direction and the second direction.

4. The molded chamfer plate according to claim 1, wherein:

the second grooves are consistent with the extending direction of the first grooves, and the first grooves and the second grooves are staggered in the first direction.

5. The molded chamfer plate according to claim 1, wherein:

the pre-cut portion is provided as a projection or slit.

6. The molded chamfer plate according to claim 1, wherein:

the first plate surface of the plate main body is provided with a color film layer, and the surface of the color film layer is provided with a wear-resistant layer.

7. A processing apparatus for forming the die chamfer plate material of any one of claims 1-6.

8. The processing apparatus according to claim 7, wherein:

the processing equipment comprises a frame, a conveying device, a first compression roller and a second compression roller, wherein the conveying device is arranged on the frame and is used for bearing and conveying the plate along the first direction; the first press roller and the second press roller are arranged in parallel at intervals and are both rotatably arranged on the frame, and a channel for a plate to pass through is formed between the first press roller and the second press roller; the first press roller is provided with a first convex part for forming the first groove, and the second press roller is provided with a second convex part for forming the second groove.

9. The processing apparatus according to claim 8, wherein:

the axis of the first compression roller and the axis of the second compression roller jointly determine a reference plane, in the first direction, the included angle between the first convex part of the first groove adjacent to the first groove and the second groove formed by the first convex part of the second groove adjacent to the first groove and the reference plane in the rotation direction is a first included angle, the included angle between the second convex part of the second groove adjacent to the first groove and the second groove formed by the second convex part of the second groove and the reference plane in the rotation direction is a second included angle, and the angle of the first included angle is not equal to the angle of the second included angle.

10. The processing apparatus according to claim 8, wherein:

the first convex portion is detachably connected with the first press roller, or the second convex portion is detachably connected with the second press roller.