Roller flying shear die for cutting sanitary product cores

Abstract

The utility model provides a kind of sanitary product cotton core uniform cutting's cylinder flying shear die cutting roller, belong to rolling die cutting equipment technical field.It solves the problem such as insufficient service life of existing die cutting roller.This sanitary product cotton core uniform cutting's cylinder flying shear die cutting roller, including upper roller shaft and lower roller shaft, upper roller shaft is sleeved and is fixed with upper cylinder, lower roller shaft is sleeved and is fixed with lower cylinder, the outer circumferential surface of upper cylinder is provided with upper scissors, the outer circumferential surface of lower cylinder is provided with lower scissors capable of forming with upper scissors and cutting, the cross section of upper scissors and the cross section of lower scissors are all right-angled triangle;At the cutting of upper scissors and lower scissors, lower scissors is located at the outside of upper scissors, the right angle surface of lower scissors is oppositely arranged with the right angle surface of upper scissors and there is gap between them, the projection of upper scissors on the plane of the right angle surface of lower scissors partially overlaps with lower scissors.This cylinder flying shear die cutting roller improves service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of roller die-cutting equipment, and relates to a roller flying shear die-cutting roller for cutting cotton cores of sanitary products. Background Technology

[0002] Hygiene products include sanitary napkins, panty liners, period pants, baby and adult diapers, etc. Currently, the die-cutting machine for cotton core cutting of hygiene products includes a frame and upper and lower rollers on the support. The upper roller is equipped with an upper cutter on its outer circular surface, and the upper roller is also called the upper cutter roller. The outer circular surface of the lower roller is smooth, and the lower roller is also called the lower anvil roller.

[0003] For example, a rolling die-cutting roller disclosed in Chinese patent document [publication number: CN101284382A] is used in which the cotton core material is located between the upper roller shaft and the lower roller shaft during operation. The upper roller rotates, and the cutter acts on the cotton core material to cut individual cotton cores into shape. However, in this rolling die-cutting method, the cutting force is concentrated on the upper cutter of the upper roller, which wears out quickly and has a short service life, especially when rolling and cutting cotton cores with a large thickness. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a roller-type flying shear die-cutting roller for cutting cotton cores in hygiene products, thereby solving the technical problem of how to improve service life.

[0005] The objective of this utility model can be achieved through the following technical solutions: A die-cutting roller for cutting cotton cores in sanitary products includes an upper roller shaft and a lower roller shaft. An upper roller is mounted and fixed on the upper roller shaft, and a lower roller is mounted and fixed on the lower roller shaft. An upper shear is provided on the outer circumferential surface of the upper roller. The lower roller has a lower shear on its outer circumferential surface that can cut against the upper shear. The cross-sections of both the upper and lower shears are right-angled triangles. At the point where the upper and lower shears cut against each other, the lower shear is located outside the upper shear. The right-angled surface of the lower shear is opposite to the right-angled surface of the upper shear, with a gap between them. The projection of the upper shear onto the surface containing the right-angled surface of the lower shear partially overlaps with the lower shear.

[0006] During operation, the cotton core material is located between the upper and lower rollers. The upper and lower roller shafts rotate synchronously in opposite directions, and the upper and lower shears cut the cotton core material into individual shaped cotton cores. When the upper and lower shears cut, since the cross-sections of both the upper and lower shears are right-angled triangles, and the right-angled surfaces of the lower and upper shears are opposite each other with a gap between them, the projection of the upper shear onto the right-angled surface of the lower shear partially overlaps with the lower shear. This creates a shearing force between the upper and lower shears, thus distributing the force across both shears and avoiding concentrated force caused by a single blade. This improves the service life of both the upper and lower shears, and consequently, the service life of the roller die-cutting roller.

[0007] In the aforementioned roller die-cutting roller for uniformly cutting cotton wicks in sanitary products, the blade angles of the upper and lower scissors are the same, the blade widths of the upper and lower scissors are the same, the blade heights of the upper and lower scissors are the same, and the blade widths of the upper and lower scissors are the same. This allows the upper and lower scissors to evenly distribute the shearing force, resulting in a similar service life for both.

[0008] In the aforementioned roller cutting roller for cutting cotton cores of sanitary products, the blade angle of the upper scissors is 15°-30°.

[0009] The blade angle of the upper scissors is 15°-30°. Different blade angles can be used depending on the thickness of the cotton core to ensure the cutting effect. For example, a blade angle of 15°-20° is suitable for ultra-thin cores, while a blade angle of 25°-30° is more suitable for thick cores containing fluff pulp.

[0010] In the aforementioned roller die-cutting roller for cutting cotton wicks in sanitary products, the blade width of the upper scissors is 0.02mm-0.03mm, the blade height is 16mm-18mm, and the blade width is 4mm-5mm. This configuration provides sufficient shearing force while ensuring the overall structural strength of the blades, thus guaranteeing the service life of both the upper and lower scissors.

[0011] In the aforementioned roller die-cutting roller for cutting cotton wicks for sanitary products, the gap between the right-angled surfaces of the lower and upper scissors is 0.01mm-0.03mm. This reduces burrs and improves cutting quality.

[0012] In the aforementioned roller die-cutting roller for cutting cotton wicks for sanitary products, both ends of the upper roller have protruding upper rings on their outer circumferential surfaces, and both ends of the lower roller have protruding lower rings on their outer circumferential surfaces. The outer circumferential surfaces of the upper and lower rings can abut against the corresponding outer circumferential surfaces of the lower rings. The abutment of the upper and lower rings radially positions the upper and lower rollers, reducing the occurrence of radial collisions between the upper and lower shears.

[0013] In the aforementioned roller shear die-cutting roller for cutting cotton cores of sanitary products, an upper shoulder is provided on the outer circumferential surface of the upper roller shaft, and an upper threaded sleeve is also threaded onto the upper roller shaft. The upper roller is axially fixed between the upper shoulder and the upper threaded sleeve. A lower shoulder is provided on the outer circumferential surface of the lower roller shaft, and a lower threaded sleeve is also threaded onto the lower roller shaft. The lower roller is axially fixed between the lower shoulder and the lower threaded sleeve.

[0014] When the upper and lower shears are worn to their limit, remove the upper and lower roller shafts from the machine frame, then remove the upper and lower threaded sleeves, remove the upper and lower rollers completely, replace them with new upper and lower rollers, then reinstall the upper and lower threaded sleeves onto the upper and lower roller shafts respectively, and finally reinstall the upper and lower roller shafts onto the machine frame, thus facilitating the disassembly and assembly of the upper and lower rollers.

[0015] In the aforementioned roller shear die-cutting roller for cutting cotton cores of sanitary products, the upper roller is composed of several upper cylinder segments with arc-shaped cross sections arranged sequentially along the circumference, and the lower roller is composed of several lower cylinder segments with arc-shaped cross sections arranged sequentially along the circumference. The upper cylinder segments are detachably and fixedly connected to the outer circumferential surface of the upper roller shaft, and the lower cylinder segments are detachably and fixedly connected to the outer circumferential surface of the lower roller shaft.

[0016] When the upper and lower shears are worn to their limit, the upper and lower roller segments can be disassembled and replaced with new ones. The upper roller is composed of upper roller segments, and the lower roller is composed of lower roller segments. This reduces the disassembly and assembly of the upper and lower roller shafts on the machine frame, making the replacement operation convenient.

[0017] Compared with the prior art, the present invention has the following advantages: An upper shear is provided on the outer circumferential surface of the upper roller, and a lower shear is provided on the outer circumferential surface of the lower roller, which can form a tangent with the upper shear. The cross-sections of the upper and lower shears are both right-angled triangles. At the tangent point of the upper and lower shears, the lower shear is located outside the upper shear. The right-angled surface of the lower shear is opposite to the right-angled surface of the upper shear and there is a gap between them. The projection of the upper shear on the surface where the right-angled surface of the lower shear is located overlaps with the lower shear. The shearing force is shared by the upper and lower shears, thereby improving the service life. Attached Figure Description

[0018] Figure 1This is a front view schematic diagram of Embodiment 1 of the roller flying shear die-cutting roller.

[0019] Figure 2 yes Figure 1 Enlarged cross-sectional view at point A in the middle.

[0020] Figure 3 This is a cross-sectional enlarged schematic diagram of the upper shear section in Embodiment 1 of this roller flying shear die-cutting roller.

[0021] Figure 4 This is a cross-sectional schematic diagram of the upper roller in Embodiment 2 of this roller flying shear die-cutting roller.

[0022] Figure 5 This is a cross-sectional schematic diagram of the lower roller in Embodiment 2 of this roller flying shear die-cutting roller.

[0023] Figure 6 This is a front view schematic diagram of Embodiment 3 of the roller flying shear die-cutting roller.

[0024] Figure 7 This is a schematic diagram of the working process of Embodiment 4 of the roller flying shear die-cutting roller.

[0025] In the diagram, 1 is the upper roller shaft; 1a is the upper shoulder; 2 is the upper roller; 2a is the upper shears; 2b is the upper convex ring; 2c is the upper cylinder segment; 3 is the upper threaded sleeve; 4 is the lower roller shaft; 4a is the lower shoulder; 5 is the lower roller; 5a is the lower shears; 5b is the lower convex ring; 5c is the lower cylinder segment; 6 is the lower threaded sleeve; 7 is the gap; θ is the blade angle of the upper shears; B is the blade width of the upper shears; H is the blade height of the upper shears; W is the blade width of the upper shears; δ is the gap between the right-angled surface of the lower shears and the right-angled surface of the upper shears; h is the overlap height between the projection of the upper shears onto the right-angled surface of the lower shears and the lower shears. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] Example 1

[0028] like Figure 1As shown, a die-cutting roller for cutting cotton wicks in hygiene products includes an upper roller and a lower roller. The upper roller includes an upper roller shaft 1 and an upper roller 2 mounted and fixed on the upper roller shaft 1. The lower roller includes a lower roller shaft 4 and a lower roller 5 mounted and fixed on the lower roller shaft 4. The upper roller shaft 1 and the lower roller shaft 4 are arranged in parallel and supported on a frame. A motor is connected to the upper roller shaft 1, and the upper roller shaft 1 and the lower roller shaft 4 are connected by a transmission to achieve synchronous reverse rotation. The length of the upper roller 2 is the same as the length of the lower roller 5, and the outer diameter of the upper roller 2 is the same as the outer diameter of the lower roller 5. The upper roller 2 is fixedly connected to the upper roller shaft 1 by bolts or screws (not shown in the figure), which pass through the cylinder wall of the upper roller 2 and are threadedly connected to the upper roller shaft 1. The lower roller 5 is fixedly connected to the lower roller shaft 4 by bolts or screws (not shown in the figure), which pass through the cylinder wall of the lower roller 5 and are threadedly connected to the lower roller shaft 4. Both ends of the upper roller 2 have protruding upper rings 2b on their outer circumferential surfaces, and both ends of the lower roller 5 have protruding lower rings 5b on their outer circumferential surfaces. The outer circumferential surfaces of the upper rings 2b can abut against the corresponding outer circumferential surfaces of the lower rings 5b. The outer circumferential surface of the upper roller shaft 1 is provided with an upper shoulder 1a, and an upper threaded sleeve 3 is also threaded onto the upper roller shaft 1. The upper roller 2 is axially fixed between the upper shoulder 1a and the upper threaded sleeve 3. The outer circumferential surface of the lower roller shaft 4 is provided with a lower shoulder 4a, and a lower threaded sleeve 6 is also threaded onto the lower roller shaft 4. The lower roller 5 is axially fixed between the lower shoulder 4a and the lower threaded sleeve 6.

[0029] like Figure 2 and Figure 3 As shown, an upper shear 2a is provided on the outer circumferential surface of the upper roller 2, and a lower shear 5a is provided on the outer circumferential surface of the lower roller 5, capable of forming a tangent with the upper shear 2a. The cross-sections of both the upper shear 2a and the lower shear 5a are right-angled triangles. At the tangent point of the upper shear 2a and the lower shear 5a, the lower shear 5a is located outside the upper shear 2a. The right-angled surface of the lower shear 5a is positioned opposite the right-angled surface of the upper shear 2a, with a gap 7 between them. The projection of the upper shear 2a onto the surface containing the right-angled surface of the lower shear 5a partially overlaps with the lower shear 5a. The overlap height h between the projection of the upper shear 2a onto the right-angled surface of the lower shear 5a and the lower shear 5a is 0.1-0.5 times the blade height H of the upper shear 2a.

[0030] The blade angle θ of the upper scissors 2a is the same as that of the lower scissors 5a. The blade width B of the upper scissors 2a is the same as that of the lower scissors 5a. The blade height H of the upper scissors 2a is the same as that of the lower scissors 5a. The blade width W of the upper scissors 2a is the same as that of the lower scissors 5a. The blade angle θ of the upper scissors 2a is 15°-30°. For example, a blade angle θ of 15°-20° is suitable for ultra-thin cores, while a blade angle θ of 25°-30° is more suitable for thick cores containing fluff pulp. The blade width B of the upper scissors 2a is 0.02 mm-0.03 mm, the blade height H is 16 mm-18 mm, and the blade width W is 4 mm-5 mm. The gap δ between the right-angled surface of the lower shear 5a and the right-angled surface of the upper shear 2a is 0.01mm-0.03mm. This gap δ is also called the offset between the cutting lines of the upper shear 2a and the lower shear 5a. This offset is dynamically adjusted according to the thickness of the material being cut, with the aim of ensuring better cleaning of the material's rough edges during cutting. For example, for a 1mm thick cotton core, the blade width B of the upper shear 2a can be 0.025mm, the blade height H of the upper shear 2a can be 17mm, the blade width W of the upper shear 2a can be 4.5mm, the offset between the cutting lines of the upper shear 2a and the lower shear 5a can be 0.02mm, and the overlap height h between the projection of the upper shear 2a onto the right-angled surface of the lower shear 5a and the lower shear 5a can be 3mm.

[0031] During operation, the cotton core material is located between the upper roller 2 and the lower roller 4. The upper roller shaft 1 and the lower roller shaft 4 rotate synchronously in opposite directions. The upper shear 2a and the lower shear 5a cut the cotton core material into individual shaped cotton cores. When the upper shear 2a and the lower shear 5a cut, since the cross-sections of both the upper shear 2a and the lower shear 5a are right-angled triangles, and the right-angled surface of the lower shear 5a is opposite to the right-angled surface of the upper shear 2a with a gap 7 between them, the projection of the upper shear 2a onto the surface where the right-angled surface of the lower shear 5a is located partially overlaps with the lower shear 5a. This creates a shearing force between the upper shear 2a and the lower shear 5a, thus distributing the force to both shear 2a and the lower shear 5a, avoiding concentrated force caused by single-blade force, thereby improving the service life of the upper shear 2a and the lower shear 5a, and improving the service life of the roller flying shear die-cutting roller.

[0032] Example 2

[0033] like Figure 4 and Figure 5As shown, the upper roller 2 and the lower roller 5 are separate structures, and the other structures are basically the same as in Embodiment 1. Specifically, the upper roller 2 is composed of several upper roller segments 2c with arc-shaped cross-sections arranged sequentially along the circumference, and the lower roller 5 is composed of several lower roller segments 5c with arc-shaped cross-sections arranged sequentially along the circumference. The upper roller segments 2c are detachably fixed to the outer circumferential surface of the upper roller shaft 1 by bolts or screws, and the lower roller segments 5c are detachably fixed to the outer circumferential surface of the lower roller shaft 4 by bolts or screws.

[0034] This split roller structure is called a modular cutter. Modular cutters can be made of powder metallurgy high-speed steel, such as grade S290 or other hard alloys, which can improve the shearing effect and the service life of the roller shears. Compared with existing die-cutting rollers, the service life can be increased by about 10 times.

[0035] The modular rotary shear cutter with embedded roller surfaces utilizes rotary shear technology to die-cut various types of disposable hygiene products' cotton core materials using upper roller 2 and lower roller 5 with shearing lines. It is suitable for cutting and shaping cotton core materials in fully servo-driven high-speed hygiene product production lines. It features high efficiency, accuracy, and stable rotary shearing. Compared to existing traditional rotary die-cutting technology, rotary shear die-cutting offers higher shearing speed and better cut cotton core quality, and is more suitable for cutting cotton cores of different thicknesses. Furthermore, its high degree of automation extends the service life of the upper and lower cutting rollers, and it is easy to operate, significantly reducing worker fatigue and improving production efficiency.

[0036] Example 3

[0037] like Figure 6 As shown, the blade lines of the upper scissors 2a and the lower scissors 5a are suitable for diapers, and the other structures are basically the same as in Example 1. Different types of sanitary products have different blade line designs for their cotton cores; the blade line designs of the upper scissors 2a and lower scissors 5a for other sanitary product cotton cores are not shown here.

[0038] Example 4

[0039] like Figure 7 As shown, the upper roller shaft 1 and the upper roller 2 are eccentrically positioned, and the upper roller shaft 1 is generally a crankshaft. When the upper roller 2 rises, the gap between the upper roller 2 and the lower roller 5 is three times the thickness of the cotton core. To ensure normal cutting, the blade height H of the upper shears 2a needs to be adaptively adjusted according to the eccentricity between the upper roller shaft 1 and the upper roller 2. Other structures are basically the same as in Embodiment 1, Embodiment 2, or Embodiment 3. The working process includes three stages: the start-up stage, the shearing stage, and the reset stage.

[0040] Start-up phase: When the control system receives the shearing command, it starts the motor, which drives the upper roller 2 and the lower roller 5 to start rotating. At this time, the upper shears 2a and the lower shears 5a are in the non-working position and do not come into contact with the cotton core material of each type of sanitary product.

[0041] Shearing Stage: As the upper roller 2 and lower roller 5 rotate, the blades of the upper shears 2a and lower shears 5a gradually approach the cotton core material. When the upper shears 2a and lower shears 5a come into contact with the material, they utilize their sharp blades and the high-speed rotation of the upper roller 2 and lower roller 5 to quickly cut the cotton core material into shape. This process needs to be completed in a very short time to ensure accurate shearing and production efficiency.

[0042] Reset Phase: After the cotton core shearing is completed, the control system will control the motor to slow down and stop the rotation of the upper roller 2 and lower roller 5. At the same time, the upper shear 2a and lower shear 5a will also return to the non-working position, waiting for the next shearing command. This cycle repeats, allowing the high-speed machine to automatically and continuously complete the shearing action, ensuring its long-term stable and rapid shearing operation.

[0043] Upper roller 2 function: By rolling and shearing, it reduces friction between the blade and the cotton core material, reducing wear and extending service life. In addition, the rolling shearing action helps maintain the stability of the cutting depth during the cutting process, preventing the cross-section of the material core from bending and deforming.

[0044] Lower roller 5 function: It can provide shearing reaction force and achieve burr removal by coordinating the offset of the upper shears 2a and the lower shears 5a.

[0045] Roller shearing technology, as a highly efficient shearing device for cotton core materials of various disposable hygiene products, has a unique working principle and significant effects. The application of this roller shearing technology in the field of hygiene product manufacturing brings greater economic benefits to hygiene product manufacturers.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A roller die-cutting roller for cutting cotton cores of sanitary products, comprising an upper roller shaft (1) and a lower roller shaft (4), wherein an upper roller (2) is mounted and fixed on the upper roller shaft (1), and a lower roller (5) is mounted and fixed on the lower roller shaft (4), and an upper shear (2a) is provided on the outer circumferential surface of the upper roller (2), characterized in that, The lower roller (5) is provided with a lower scissor (5a) that can be cut to the upper scissor (2a). The cross-sections of the upper scissor (2a) and the lower scissor (5a) are both right-angled triangles. At the point where the upper scissor (2a) and the lower scissor (5a) are cut, the lower scissor (5a) is located outside the upper scissor (2a). The right-angled surface of the lower scissor (5a) is set opposite to the right-angled surface of the upper scissor (2a) and there is a gap (7) between them. The projection of the upper scissor (2a) onto the surface where the right-angled surface of the lower scissor (5a) is located partially overlaps with the lower scissor (5a).

2. The roller die-cutting roller for cutting cotton wicks for sanitary products according to claim 1, characterized in that, The blade angle (θ) of the upper scissors (2a) is the same as that of the lower scissors (5a), the blade width (B) of the upper scissors (2a) is the same as that of the lower scissors (5a), the blade height (H) of the upper scissors (2a) is the same as that of the lower scissors (5a), and the blade width (W) of the upper scissors (2a) is the same as that of the lower scissors (5a).

3. The roller die-cutting roller for cutting cotton cores of sanitary products according to claim 2, characterized in that, The blade angle (θ) of the upper scissors (2a) is 15°-30°.

4. The roller die-cutting roller for cutting cotton wicks for sanitary products according to claim 2, characterized in that, The blade width (B) of the upper scissors (2a) is 0.02 mm-0.03 mm, the blade height (H) of the upper scissors (2a) is 16 mm-18 mm, and the blade width (W) of the upper scissors (2a) is 4 mm-5 mm.

5. The roller die-cutting roller for cutting cotton wicks for sanitary products according to any one of claims 1-4, characterized in that, The gap (δ) between the right-angled surface of the lower scissors (5a) and the right-angled surface of the upper scissors (2a) is 0.01mm-0.03mm.

6. The roller die-cutting roller for cutting cotton wicks for sanitary products according to claim 5, characterized in that, The upper roller (2) has protruding upper rings (2b) on the outer peripheral surfaces at both ends, and the lower roller (5) has protruding lower rings (5b) on the outer peripheral surfaces at both ends. The outer peripheral surface of the upper ring (2b) can abut against the outer peripheral surface of the corresponding lower ring (5b).

7. The roller die-cutting roller for cutting cotton wicks for sanitary products according to claim 5, characterized in that, The upper roller shaft (1) has an upper shoulder (1a) on its outer circumferential surface and an upper threaded sleeve (3) is threaded onto the upper roller shaft (1). The upper roller (2) is axially fixed between the upper shoulder (1a) and the upper threaded sleeve (3). The lower roller shaft (4) has a lower shoulder (4a) on its outer circumferential surface and a lower threaded sleeve (6) is threaded onto the lower roller shaft (4). The lower roller (5) is axially fixed between the lower shoulder (4a) and the lower threaded sleeve (6).

8. The roller die-cutting roller for cutting cotton wicks for sanitary products according to claim 5, characterized in that, The upper roller (2) is composed of several upper roller segments (2c) with arc-shaped cross sections arranged in sequence along the circumference. The lower roller (5) is composed of several lower roller segments (5c) with arc-shaped cross sections arranged in sequence along the circumference. The upper roller segments (2c) are detachably fixedly connected to the outer circumferential surface of the upper roller shaft (1), and the lower roller segments (5c) are detachably fixedly connected to the outer circumferential surface of the lower roller shaft (4).

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