A deformation-resistant cable

Abstract

The present application relates to the technical field of cable, in particular to an anti-deformation cable, which comprises a cable core layer wrapping a cable core part, a strip-shaped armor clamped on the cable core layer in the axial direction, and the number of strip-shaped armors is not less than four, the four strip-shaped armors are axially spaced, and a transition limiting belt is clamped between the axial position of the strip-shaped armors, the arc-shaped ends of the transition limiting belt are clamped between the adjacent two strip-shaped armors, there is a gap between the two transition limiting belts, and the number of the strip-shaped armors and the transition limiting belt is equal. Compared with the existing armored cable, the present application has a three-in-one protection mechanism, and has good performance and good reset mechanism in terms of anti-torsion, anti-pressure and anti-stretching. In addition, when connecting the cable, no accessories are needed, the intermediate transition limiting belt is directly clamped behind the strip-shaped armor to form an intermediate layer of armored effect, which is convenient to use, has lower weight, and is suitable for use in multiple scene construction.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically to a deformation-resistant cable. Background Technology

[0002] Armored cables are high-performance cables, and existing armored cables are made using a multi-layer winding method. The most common method uses a metal layer to hold multiple strands of cable inside, and then a rubber outer layer wraps around the metal layer. This type of cable is bulky and heavy. Furthermore, with this spiral winding method, if a torsional force occurs, the spiral direction is opposite to the direction of the wound metal layer. This effectively loosens the metal layer, posing a risk of the stainless steel layer cutting the outer sheath. Under pressure, the inner armor layer is also prone to deformation, and it doesn't provide sufficient deformation allowance during tensile testing. Especially during installation, handling the armor layer is difficult, and subsequent connection operations are cumbersome. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a deformation-resistant cable.

[0004] The technical solution of the present invention is implemented as follows: a deformation-resistant cable includes a core sheath covering the core portion, strip-shaped armor engaged axially on the core sheath, and the number of strip-shaped armor is not less than four. The four strip-shaped armors are spaced apart axially and are engaged with transition limiting bands at the axial center position. The arc-shaped ends of the transition limiting bands are engaged between two adjacent strip-shaped armors. There is a gap between the two transition limiting bands. The number of strip-shaped armors and transition limiting bands is equal. An outer protective layer is wrapped around the transition limiting bands.

[0005] The outer protective layer includes a foreskin layer, in which capillaries are embedded with a protective mesh of inner and outer layers. Multiple upper pressing layers are embedded in the annular groove on the outer periphery of the foreskin layer, and multiple lower pressing layers are embedded in the annular groove on the inner periphery of the foreskin layer.

[0006] Furthermore, the cable core cladding includes a rigid sheath, the surface of which is integrally formed with spaced-apart annular fins, and an annular cavity is reserved between two adjacent annular fins.

[0007] The cable core sheath is made of hard rubber, while the annular wing is an elastic rubber ring set on the hard sheath. The inside of the annular wing is flush with the inner wall of the hard sheath and fits on the surface of the cable core. In this way, the annular wing can be stretched axially during the stretching process, and can provide elastic compression margin when compressed.

[0008] Furthermore, the strip-shaped armor includes an armor plate and a limiting opening. The armor plate is fan-shaped, and the armor plate has perforations at the same height as the annular wing. The winding tape is arranged in an S-shaped route along the perforations on the multiple armor plates and is inserted into the armor plate.

[0009] Multiple axially spaced strip-shaped armor plates are arranged on the outer side of the cable core sheath, ensuring that the angle between the extended lines of the fan-shaped gaps between the strip-shaped armor plates and the axis is maintained within 30°-60°. This arrangement aims to ensure that, under axial pressure at 60°, the lines connecting the nearest edges of two adjacent armor plates to the points on the outer arc edges and side edges of the two armor plates form an equilateral triangle. This provides stability under pressure, better supporting the stressed area and preventing deformation. Furthermore, it is important to ensure that the number of these strip-shaped armor plates is even and symmetrically distributed on the cable core sheath. This further stabilizes the middle layer and provides effective support. After the armor plate is inserted between two annular flaps, the bottom and the hard... After the sheath contacts the cable, the operation is completed. During the stretching process, because the winding tape is set in an S-shaped path and is inserted into the armor plate, it ensures that the surface of the winding tape is close to the surface of the annular wing, and the outer side of the winding tape is flush with the side of the armor plate. During the stretching process, the winding tape can limit the range of axial movement, and the wrapping design can improve the overall toughness. In addition, it can provide resistance to overall deformation during twisting. Moreover, the exposed part is spaced on both sides of the armor plate. Since the cable deformation gradually disperses in a spiral from the twisting point to both sides of the axial direction when twisting the cable, the winding tape can ensure the overall resistance to twisting and also help to restore the displacement generated between the annular wing and the armor plate after twisting. The winding tape can also be used as a depth reference line to determine whether the requirements are met in the manufacturing of the strip armor.

[0010] Furthermore, the transition limiting band includes an arc-shaped plate, and arc-shaped strips are evenly arranged on the inner wall of the arc-shaped plate. One end of each arc-shaped strip is located between two annular winglets and forms a cavity between two armor plates. An arc-shaped reinforcing rib is arranged between the two arc-shaped strips to contact the two armor plates. An undercut foot is provided on both sides of the arc-shaped reinforcing rib to engage in the limiting opening.

[0011] Furthermore, the protective net includes external reinforcing bars and internal reinforcing bars, and there are multiple external and internal reinforcing bars. The multiple external and internal reinforcing bars are arranged around the outer layer, and the external and internal reinforcing bars are arranged in a wavy and curved manner.

[0012] Furthermore, the upper pressing layer includes an upper pressing plate and a first connecting strip. Multiple upper pressing plates are connected by multiple axially arranged first connecting strips. The first connecting strips have the same shape as the outer reinforcing strips but are thinner in diameter.

[0013] Furthermore, the lower pressing layer includes a lower pressing plate and a second connecting strip, and multiple lower pressing plates are connected by multiple axially arranged second connecting strips.

[0014] Furthermore, an outer ring is formed by multiple upper pressing plates surrounding each other, and an inner ring is formed by multiple lower pressing plates surrounding each other, with the inner and outer rings being staggered.

[0015] Furthermore, a dividing strip is provided on the foreskin layer, and tear strips are provided between the multiple upper pressing layers and the multiple lower pressing layers.

[0016] The present invention has the following beneficial effects:

[0017] 1. Multiple axially spaced strips of armor are arranged on the outer side of the cable core sheath. When pressure is applied, a stable state can be formed, which can better support the stressed area and prevent deformation. After the armor plate is inserted between two annular fins, the bottom contacts the hard sheath to complete the operation. During the stretching process, because the winding tape is arranged in an S-shape and is inserted into the armor plate, the surface of the winding tape is close to the surface of the annular fins, and the outer side of the winding tape is flush with the side of the armor plate. During the stretching process, the winding tape can limit the range of axial movement, and the wrapping design can improve the overall toughness. In addition, it can block the overall deformation during twisting. Moreover, the exposed part is spaced on both sides of the armor plate. Since the cable deformation gradually disperses in a spiral from the twisting point to both sides of the axis when twisting the cable, the winding tape can ensure the overall resistance to twisting and also help to restore the displacement generated between the annular fins and the armor plate after twisting. The winding tape can also be used as a depth reference line to determine whether the requirements of the strip armor manufacturing are met.

[0018] 2. The advantages of the wavy bending design of external and internal ribs: If straight, parallel external and internal ribs are used, they have almost no extensibility under tension, and the cable will become very stiff. Furthermore, during small-radius bending, the straight external and internal ribs may be "push out" or damaged. However, the bent external and internal ribs undergo a slight "straightening" process under tension. During this process, the external and internal ribs themselves are not stretched, but they provide a certain amount of extensibility and buffer for the cable, allowing the tensile structure to be compatible with the bending deformation of the cable.

[0019] 3. Multiple external and internal reinforcing bars connect to form a surrounding mesh, creating a stable topological structure. When the cable is subjected to torsion, this mesh acts as a whole to resist deformation. It effectively distributes localized stress across the entire circumference. Ordinary unarmored cables, when subjected to strong torsion, may experience relative slippage between internal layers, causing the outer sheath to bulge or even tear, forming a "lantern" shape. The external and internal reinforcing bar mesh layer acts like a robust "cage," tightly binding the internal structure of the cable together and preventing it from shifting due to torsion.

[0020] 4. The design of the upper pressure plate: Without the upper pressure plate, when the cable is subjected to enormous tensile force, the surrounding outer and inner ribs tend to be "straightened." During this process, the geometry of the surrounding outer and inner ribs may undergo uneven distortion; for example, some meshes may be stretched wider, while others may be compressed. The first connecting strip firmly fixes the surrounding outer and inner ribs to the designed bending arc, ensuring the synchronization and stability of the entire surrounding outer and inner rib structure during the stretching process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the transition limiting band and strip armor of the present invention;

[0023] Figure 3 This is a schematic diagram of the annular wing of the present invention;

[0024] Figure 4 This is a schematic diagram of the strip-shaped armor of the present invention;

[0025] Figure 5 This is a schematic diagram of the foreskin layer of the present invention;

[0026] Figure 6 This is a schematic diagram of the multiple upper pressing layers and multiple lower pressing layers of the present invention;

[0027] Figure 7 This is a schematic diagram of the arc-shaped reinforcing rib of the present invention;

[0028] Figure 8 This is a schematic diagram of the protective netting of the present invention;

[0029] Figure 9 This is a distribution diagram of the upper and lower pressing layers of this invention;

[0030] Figure 10 This is a schematic diagram of the foreskin layer of the present invention.

[0031] In the diagram: 1. Cable core cladding; 11. Rigid sheath; 12. Annular wing; 13. Annular cavity; 2. Cable core section; 3. Strip armor; 31. Armor plate; 32. Wrapping tape; 33. Limiting opening; 4. Transition limiting tape; 41. Arc plate; 42. Silicone layer; 43. Arc strip; 44. Arc reinforcing rib; 45. Inverted foot; 5. Sheath layer; 51. Outer sheath; 52. Capillary pore; 53. Annular groove; 6. Dividing strip; 7. Protective net; 71. External reinforcing strip; 72. Internal reinforcing strip; 8. Upper pressing layer; 81. Upper pressing plate; 82. First connecting strip; 9. Lower pressing layer; 91. Lower pressing plate; 92. Second connecting strip; 10. Tear strip. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figures 1 to 10 The cable shown includes a core sheath 1 that wraps the core portion 2, strip armor 3 that is axially engaged with the core sheath 1, and the number of strip armor 3 is not less than four. There is a gap between the four strip armor 3 in the axial direction and a transition limiting band 4 is engaged with the center position. The arc-shaped ends of the transition limiting band 4 are engaged between two adjacent strip armor 3. There is a gap between the two transition limiting bands 4. The number of strip armor 3 and transition limiting band 4 is equal. An outer protective layer is wrapped on the transition limiting band 4.

[0034] The outer protective layer includes a foreskin layer 5, with a protective mesh 7 embedded in the capillary pores 52 inside the foreskin layer 5, and multiple upper pressing layers 8 embedded in the annular groove 53 on the outer periphery of the foreskin layer 5, and multiple lower pressing layers 9 embedded in the annular groove 53 on the inner periphery of the foreskin layer 5.

[0035] The cable core sheath 1 includes a rigid sheath 11, and the surface of the rigid sheath 11 is integrally formed with spaced annular winglets 12, with an annular cavity 13 reserved between two adjacent annular winglets 12.

[0036] The cable core sheath 1 is constructed with a rigid rubber sheath 11, while the annular wing 12 is an elastic rubber ring disposed on the rigid sheath 11. The inner surface of the annular wing 12 is flush with the inner wall of the rigid sheath 11 and adheres to the surface of the cable core portion 2. In this way, the annular wing 12 can be stretched axially during the stretching process, and can provide elastic compression allowance when compressed.

[0037] The strip armor 3 includes armor plates 31, which are fan-shaped and have perforations at the same height as the annular wing 12. The winding tape 32 is arranged along the perforations on the multiple armor plates 31 in an S-shaped route and is inserted into the armor plates 31.

[0038] Multiple axially spaced strip-shaped armor plates 3 are arranged on the outer side of the cable core sheath 1, ensuring that the angle between the extended lines of the fan-shaped gaps between the strip-shaped armor plates 3 and the axis is maintained within 30°-60°. This arrangement aims to ensure that, under axial pressure at 60°, the lines connecting the points where two adjacent armor plates 31 meet and the outer arc edges of the two armor plates 31 form an equilateral triangle. This provides stability under pressure, better supporting the stressed area and preventing deformation. Furthermore, the number of these strip-shaped armor plates 3 should be even, symmetrically distributed on the cable core sheath 1, to ensure more stable and effective support for the middle layer. After the armor plates 31 are inserted between the two annular flaps 12, their bottoms contact the rigid sheath 11. After the operation is completed, during the stretching process, because the winding tape 32 is set according to the S-shaped route and is inserted into the armor plate 31, it ensures that the surface of the winding tape 32 is close to the surface of the annular wing 12, and the outer side of the winding tape 32 is flush with the side of the armor plate 31. During the stretching process, the winding tape 32 can limit the range of axial movement, and the wrapping design can improve the overall toughness. In addition, it can provide a barrier to the overall deformation when twisting. Moreover, the exposed part is set at intervals on both sides of the armor plate 31. Since the cable deformation gradually disperses in a spiral from the twisting point to both sides of the axial direction when twisting the cable, the winding tape 32 can ensure the overall anti-twist while also helping to reset the displacement generated between the annular wing 12 and the armor plate 31 after twisting. The winding tape 32 can also be used as a depth reference line to determine whether the requirements are met in the manufacturing of the strip armor 3.

[0039] The transition limiting band 4 includes an arc-shaped plate 41. Arc-shaped strips 43 are evenly arranged on the inner wall of the arc-shaped plate 41. One end of the arc-shaped strip 43 is located between two annular winglets 12 and forms a cavity between two armor plates 31. Arc-shaped reinforcing ribs 44 are arranged between the two arc-shaped strips 43 to contact the two armor plates 31. The arc-shaped reinforcing ribs 44 have undercut feet 45 that engage with the limiting openings 33 on both sides.

[0040] By setting a transition limiting band 4 between two axial strip armor plates 3, the two adjacent strip armor plates 3 can be restricted, and the arc-shaped reinforcing rib 44 abuts between the two adjacent armor plates 31, thus forming an integral ring. This helps to offset the uneven force distribution caused by torsional force, so that the torsional force will not be concentrated in one position. The armor plate 31 can have a certain deformation basis, while the arc-shaped reinforcing rib 44 is made of hard metal or hard material. The inverted foot 45 serves the purpose of positioning and can also prevent edge wrinkling of the arc plate 41 when it deforms. There is gas in the space formed by the arc strip 43, the annular wing 12 and the armor plate 31. This can play a buffering role when pressure is applied to the surface of the arc plate 41. Moreover, during the downward pressure, the cable will not deform excessively in the direction perpendicular to the downward pressure. A silicone layer 42 is also provided. The silicone layer 42 can compensate for the changes of the transition limiting band 4 when the cable is axially stretched, ensuring the following of the transition limiting band 4 with the whole.

[0041] The transition limiting band 4 also serves another important purpose: it allows the entire transition limiting band 4 to separate from the strip armor 3. When connecting cables, the existing method uses a connecting device to fix both ends of the two cables to achieve conductivity. However, this method requires expensive auxiliary components and increases installation costs. By directly tearing the transition limiting band 4 apart from the strip armor 3, one end of the cable has a longer section of the transition limiting band 4, while the other end has a longer section of the strip armor 3, ensuring the length of the reserved strip armor 3 is equal to the length of the reserved transition limiting band 4. Then, the transition limiting band 4 is clipped onto the strip armor 3. This allows for quick splicing when the two cables are connected. The outer sheath 5 is also spliced ​​in the same way and then wrapped with electrical tape or secured with clamps. This minimizes cable damage, facilitates operation, and prevents connection issues during subsequent use.

[0042] The protective net 7 includes external reinforcing bars 71 and internal reinforcing bars 72. There are multiple external reinforcing bars 71 and internal reinforcing bars 72. The multiple external reinforcing bars 71 and internal reinforcing bars 72 are arranged around the outer layer 51, and the external reinforcing bars 71 and internal reinforcing bars 72 are arranged in a wavy and curved manner.

[0043] This design enhances the performance of the sheath layer 5. When the cable is subjected to axial tensile force, most of the tensile force will be borne by the mesh of the outer reinforcing bars 71 and the inner reinforcing bars 72. The outer reinforcing bars 71 and the inner reinforcing bars 72 have extremely high tensile strength, which can effectively prevent the cable from being stretched or even broken.

[0044] The advantage of the wavy bending design of the outer reinforcing bars 71 and the inner reinforcing bars 72 is that if straight, parallel outer reinforcing bars 71 and 72 were used, they would have almost no elasticity under tension, causing the cable to become very stiff. Furthermore, during small-radius bends, the straight outer reinforcing bars 71 and 72 might be "push out" or damaged. However, the bent outer reinforcing bars 71 and 72 undergo a slight "straightening" process under tension. During this process, the outer reinforcing bars 71 and 72 themselves are not stretched, but they provide a certain amount of elasticity and buffer for the cable, allowing the tensile structure to be compatible with the bending deformation of the cable. For example, in high-rise buildings, mines, and oil wells, cables need to support their enormous weight. This layer of outer reinforcing bars 71 and 72 bears almost all the weight. When threading cables through pipes or pulling them over long distances, construction workers directly pull on the cables, and the outer reinforcing bars 71 and 72 protect the internal copper core / fiber optic components from the tensile force.

[0045] Multiple external reinforcing bars 71 and internal reinforcing bars 72 are connected to form a surrounding mesh, creating a stable topological structure. When the cable is subjected to torsion, this mesh acts as a whole to resist deformation. It effectively distributes local stress across the entire circumference. Ordinary unarmored cables, when subjected to strong torsion, may experience relative slippage between internal layers, causing the outer sheath to bulge or even tear, forming a "lantern" shape. The mesh layer of external reinforcing bars 71 and internal reinforcing bars 72 acts like a robust "cage," tightly binding the internal structure of the cable together and preventing it from becoming misaligned due to torsion. For example, when the cable is being wound up or down on a reel, especially at high speeds or under uneven stress, torsion can easily occur. Moving cables used in equipment such as port cranes and mining excavators are frequently subjected to torsion during equipment operation and cable dragging, and the above design provides better protection for the entire cable.

[0046] The external reinforcing bars 71 and internal reinforcing bars 72 surrounding the inner sheath layer 5 form a mesh that is mechanically similar to a "ring beam". When subjected to radial pressure from the outside, such as being crushed by a heavy object or being buried in the soil and subjected to soil pressure, this ring structure can evenly distribute the pressure throughout the circumference, preventing the pressure from concentrating at one point and flattening the fragile inner core wire.

[0047] For impacts or compression from sharp objects, the rigid outer ribs 71 and inner ribs 72 form the first line of defense. The mesh structure disperses the energy of point impacts into the surrounding mesh area, rather than transferring it directly to the internal insulation and conductors.

[0048] The upper pressing layer 8 includes an upper pressing plate 81 and a first connecting strip 82. Multiple upper pressing plates 81 are connected by multiple axially arranged first connecting strips 82. The first connecting strips 82 have the same shape as the outer reinforcing strips 71, but with a thinner diameter.

[0049] The design of the upper pressure plate 81, without which the outer and inner reinforcing ribs 71 tend to be "straightened" when the cable is subjected to enormous tensile force, could cause uneven distortion in the geometry of the outer and inner reinforcing ribs 71 and 72 during this process; for example, some meshes might be stretched wider while others are compressed. The first connecting strip 82 firmly fixes the outer and inner reinforcing ribs 71 and 72 to the designed curvature, ensuring the synchronization and stability of the entire structure of the outer and inner reinforcing ribs 71 and 72 during the stretching process.

[0050] The lower pressing layer 9 includes a lower pressing plate 91 and a second connecting strip 92, and multiple lower pressing plates 91 are connected by multiple axially arranged second connecting strips 92.

[0051] This design achieves the same effect as the upper pressing layer 8 design, so it will not be elaborated here.

[0052] An outer ring is formed by multiple upper pressing plates 81 surrounding each other, and an inner ring is formed by multiple lower pressing plates 91 surrounding each other, with the inner and outer rings being staggered.

[0053] A dividing strip 6 is provided on the foreskin layer 5, and tear strips 10 are provided between multiple upper pressing layers 8 and multiple lower pressing layers 9.

[0054] For ease of subsequent wiring, the tear strip 10 connects the upper pressing plate 81 on the upper pressing layer 8 into a complete ring, and also connects multiple lower pressing plates 91 into a complete ring. First, the sheath layer 5 can be divided into at least four parts. Then, according to the position of the tear strip 10, the connected upper pressing layer 8 and lower pressing layer 9 are pulled outward or cut to separate them. In this way, when wrapping the cable later, they can be spliced ​​into a whole.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deformation-resistant cable, characterized in that, The cable core includes a core sheath (1) that wraps the core portion (2), and strip armor (3) that is axially engaged on the core sheath (1). The number of strip armor (3) is not less than four. There is a gap between the four strip armor (3) in the axial direction and a transition limiting band (4) is engaged with the center position. The arc-shaped ends of the transition limiting band (4) are engaged between two adjacent strip armor (3). There is a gap between the two transition limiting bands (4). The number of strip armor (3) and transition limiting band (4) is equal. The transition limiting band (4) is wrapped with an outer protective layer. The outer protective layer includes a foreskin layer (5), and a protective mesh (7) with inner and outer layers is embedded in the capillary pores (52) inside the foreskin layer (5). Multiple upper pressing layers (8) are embedded in the annular groove (53) on the outer periphery of the foreskin layer (5), and multiple lower pressing layers (9) are embedded in the annular groove (53) on the inner periphery of the foreskin layer (5). The protective net (7) includes an external reinforcing bar (71) and an internal reinforcing bar (72). There are multiple external reinforcing bars (71) and internal reinforcing bars (72). The multiple external reinforcing bars (71) and internal reinforcing bars (72) are arranged around the skin layer (5), and the external reinforcing bars (71) and internal reinforcing bars (72) are arranged in a wavy bend. The upper pressing layer (8) includes an upper pressing plate (81) and a first connecting strip (82). Multiple upper pressing plates (81) are connected by multiple first connecting strips (82) arranged axially. The first connecting strip (82) has the same shape as the outer reinforcing strip (71) but a smaller diameter. The lower pressing layer (9) includes a lower pressing plate (91) and a second connecting strip (92), and multiple lower pressing plates (91) are connected by multiple axially arranged second connecting strips (92).

2. The deformation-resistant cable according to claim 1, characterized in that, The cable core sheath (1) includes a rigid sheath (11), and the surface of the rigid sheath (11) is integrally formed with spaced annular winglets (12), and an annular cavity (13) is reserved between two adjacent annular winglets (12).

3. The deformation-resistant cable according to claim 1, characterized in that, The strip armor (3) includes an armor plate (31) and a limiting port (33). The armor plate (31) is fan-shaped, and the armor plate (31) has perforations at the same height as the annular wing (12). The winding tape (32) is arranged in an S-shaped route along the perforations on the multiple armor plates (31), and the winding tape (32) is inserted into the armor plate (31).

4. The deformation-resistant cable according to claim 3, characterized in that, The transition limiting band (4) includes an arc plate (41), and arc strips (43) are provided at equal intervals on the inner wall of the arc plate (41). One end of the arc strip (43) is located between two annular winglets (12) and forms a cavity between two armor plates (31). An arc reinforcing rib (44) is provided between the two arc strips (43) to contact the two armor plates (31). An undercut foot (45) is provided on both sides of the arc reinforcing rib (44) to engage in the limiting port (33).

5. The deformation-resistant cable according to claim 1, characterized in that, An outer ring is formed by multiple upper pressing plates (81) surrounding each other, and an inner ring is formed by multiple lower pressing plates (91) surrounding each other, with the inner and outer rings being staggered.

6. The deformation-resistant cable according to claim 1, characterized in that, A dividing strip (6) is provided on the foreskin layer (5), and a tear strip (10) is provided between the multiple upper pressing layers (8) and the multiple lower pressing layers (9).

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