Wire stripping machine rear lower shaft

Abstract

The utility model provides a kind of wire stripping machine rear lower shaft, belong to wire stripping machine technical field.It solves the technical problems such as stress concentration caused by sharp apex of existing wire stripping machine.The wire stripping machine rear lower shaft includes shaft body, several convex rings are set on shaft body along the non-equal distance in axial direction, adjacent convex ring and shaft body surface are enclosed into the feed slot for accommodating and conveying cable, the side wall of convex ring is working surface, several wedge-shaped protruding units are evenly distributed on working surface along the circumference, each wedge-shaped protruding unit is arranged into multiple rows along the axial direction of convex ring, and the wedge-shaped protruding unit of same row is aligned in axial direction, wedge-shaped protruding unit includes first inclined plane, second inclined plane, third inclined plane and fourth inclined plane.The utility model has the advantages of uniform pressure distribution, stress concentration reduction, cable damage prevention, promote the discharge of scrap, stable gripping force, prolong the life of equipment and the like.

Description

Technical Field

[0001] This utility model belongs to the field of wire stripping machine technology, and specifically refers to a lower rear shaft of a wire stripping machine. Background Technology

[0002] A wire stripper is a key piece of machinery used to separate the metal conductors of waste wires or cables from their outer insulation layers, such as plastic or rubber. During operation, the roller assembly grips and conveys the wires and cables, allowing them to pass precisely and stably through high-speed rotating cutting blades, thus stripping off the outer sheath. The gripping performance of the rollers directly determines the conveying efficiency and stripping quality; it is a core component for preventing slippage and ensuring continuous and stable operation.

[0003] In existing technologies, to enhance the friction between the roller and the wire / cable, various uneven structures are commonly set on the surface of the roller's feed groove. For example, Chinese utility model patent CN222562358U discloses a wire stripping machine roller, which features several axially arranged, stepped serrated rings on the roller's inclined surface. Each serrated ring is composed of multiple circumferentially evenly distributed serrated blocks, specifically including an outer serrated surface, a serrated side surface, a serrated triangular surface, and a serrated inclined triangular surface. The design aims to use the sharp vertices of the serrated triangular surface to hook the wire / cable, enhancing grip, preventing slippage, and providing additional wear allowance through the serrated inclined triangular surface to extend service life.

[0004] However, the sharp apexes of the serrated triangular facets create extremely high local pressure when in contact with wires and cables, leading to severe stress concentration. This concentrated stress not only accelerates the formation of microcracks and fatigue fracture at the apexes of the serrated blocks themselves, shortening the roller's lifespan, but also exerts excessive force on the surface of the wires and cables, causing excessive compression or even cutting of the insulation layer. This damage is particularly pronounced for thin-diameter cables or soft insulation materials, affecting the quality and value of the recycled materials. Furthermore, because the sharp apexes of the serrated triangular facets are designed to hook the cable, these sharp apexes can easily become over-embedded in the insulation layer. When releasing the cable or when the cable surface is uneven, this strong mechanical engagement can cause insulation debris to be firmly hooked and difficult to detach on its own. These residual debris accumulate continuously in the feed trough and the gap between the serrations, weakening the subsequent gripping force, causing slippage to recur, and requiring frequent shutdowns for cleaning and maintenance.

[0005] Therefore, those skilled in the art urgently need an innovative roller design for wire strippers that can provide sufficient and stable gripping force while effectively alleviating stress concentration, reducing damage to wires and cables, and possessing good anti-fragmentation capabilities, thereby comprehensively improving the operational reliability of wire strippers, the quality of recycled materials, and the equipment maintenance cycle. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a lower rear shaft for a wire stripping machine.

[0007] The purpose of this utility model can be achieved through the following technical solution: a lower shaft of a wire stripper includes a shaft body, on which a plurality of convex rings are arranged at non-equidistant intervals along the axial direction. Adjacent convex rings and the surface of the shaft body form a feed groove for accommodating and conveying cables. The side wall of the convex ring is a working surface, on which a plurality of wedge-shaped protrusion units are arranged evenly distributed along the circumference. Each wedge-shaped protrusion unit is arranged in multiple rows along the axial direction of the convex ring, and the wedge-shaped protrusion units in the same row are aligned in the axial direction. The wedge-shaped protrusion unit includes a first inclined surface, a second inclined surface, a third inclined surface, and a fourth inclined surface.

[0008] Furthermore, the first inclined surface, the second inclined surface, the third inclined surface, and the fourth inclined surface converge at a single vertex.

[0009] Furthermore, the first, second, third, and fourth inclined surfaces intersect on the same straight line. This intersection of the first, second, third, and fourth inclined surfaces enhances the structure's strength and wear resistance, thereby extending the overall service life of the roller.

[0010] Furthermore, on the working surface of the same convex ring, wedge-shaped protrusion units in different rows are arranged alternately or aligned in the axial direction.

[0011] Furthermore, the height of the wedge-shaped protrusion unit gradually decreases from the opening of the feed trough towards the bottom. The height of the wedge-shaped protrusion units in the same row is the same, while the height of the wedge-shaped protrusion units in different rows is different, and they gradually decrease from the opening of the feed trough towards the bottom.

[0012] Furthermore, the cross-sectional area of ​​the wedge-shaped protrusion unit gradually decreases from the opening of the feed trough towards the bottom of the trough. The cross-sectional area of ​​the wedge-shaped protrusion units in the same row is the same, while the cross-sectional area of ​​the wedge-shaped protrusion units in different rows is different, and they gradually decrease from the opening of the feed trough towards the bottom of the trough.

[0013] Furthermore, the first inclined surface, the second inclined surface, the third inclined surface, and the fourth inclined surface are connected end to end in a clockwise order; and the second inclined surface and the fourth inclined surface are symmetrical about the central longitudinal axis of the first inclined surface.

[0014] Furthermore, the first inclined surface is an arc surface, and the outer diameter of the first inclined surface is smaller than the outer diameter of the convex ring.

[0015] Furthermore, the third inclined surface is inclined from the working surface toward the interior of the feed trough.

[0016] Furthermore, the second and fourth inclined surfaces of two adjacent wedge-shaped protrusion units together form an outwardly expanding flared structure. The flared structure is a V-shaped structure or a trumpet-shaped structure.

[0017] Compared with existing technologies, the technical effects of this utility model are as follows: First, the wedge-shaped protrusion unit, through the smooth transition design of the first, second, third, and fourth inclined surfaces, avoids the localized high pressure caused by the sharp serrated apex in existing technologies. This makes the pressure distribution more uniform, reduces stress concentration, and prevents the cable insulation layer from being excessively squeezed or cut. It is particularly suitable for thin-diameter cables or soft insulation materials, improving the quality and value of recycled materials. Furthermore, it further promotes the discharge of debris, reduces the accumulation of debris in the feed trough, avoids slippage caused by debris retention, extends the continuous operating time of the equipment, and reduces the need for downtime for cleaning and maintenance. Second, the second and fourth inclined surfaces of adjacent wedge-shaped protrusion units together form an outwardly expanding flared structure, such as a V-shape or a trumpet shape. This design helps insulation debris to fall off more easily when releasing the cable, rather than being hooked. Simultaneously, the third inclined surface is inclined inward into the feed trough, which can better hook the wires and cables, giving the wedge-shaped protrusion unit stronger gripping force. III. The height of the wedge-shaped protrusions gradually decreases from the opening of the feed trough towards the bottom, and the cross-sectional area gradually shrinks, forming a progressive gripping structure. This ensures uniform friction with the wires and cables, making cable transport smoother, preventing slippage, and improving the operational reliability and stripping quality of the wire stripper. IV. The first, second, third, and fourth inclined surfaces intersect on the same straight line, enhancing the structural strength and wear resistance, thereby extending the overall service life of the roller. V. The wedge-shaped protrusions are arranged in multiple rows axially on the working surface of the convex ring, and can be arranged in an alternating or aligned manner as needed. This flexibility allows the roller to adapt to cables of different diameters and materials, ensuring efficient gripping and transport under various working conditions, further improving the versatility and production efficiency of the wire stripper. Attached Figure Description

[0018] Figure 1 This is a perspective view of Embodiment 1 of the present utility model.

[0019] Figure 2 This is an enlarged view of section A in Embodiment 1 of this utility model.

[0020] Figure 3 This is a cross-sectional view of one embodiment of the present utility model.

[0021] Drawing number markings: 1. Shaft body; 2. Protruding ring; 3. Feed groove; 4. Wedge-shaped protrusion unit; 41. First inclined surface; 42. Second inclined surface; 43. Third inclined surface; 44. Fourth inclined surface; 5. Flared structure; 6. Working surface. Detailed Implementation

[0022] 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.

[0023] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example 1: According to Figures 1 to 3 As shown, the present invention provides a lower rear shaft for a wire stripper, comprising a shaft body 1. Several protruding rings 2 are arranged non-equidistantly along the axial direction of the shaft body 1. Two adjacent protruding rings 2, together with the outer surface of the shaft body 1, form a feed trough 3 for accommodating and conveying cables. The sidewalls of the protruding rings 2 are working surfaces 6 that contact the cables. The working surfaces 6 are also the two sides of the feed trough 3, and are flared.

[0025] The working surface 6 is provided with a plurality of wedge-shaped protrusion units 4 evenly distributed along the circumference of the convex ring 2. The wedge-shaped protrusion units 4 are arranged in multiple rows along the axial direction of the convex ring 2. Figure 2 The diagram shows three rows, but one, two, four, or five rows can be selected as needed, and the wedge-shaped protrusions 4 in the same row are aligned axially.

[0026] Each of the wedge-shaped protrusion units 4 includes a first inclined surface 41, a second inclined surface 42, a third inclined surface 43, and a fourth inclined surface 44. In this embodiment, the first inclined surface 41, the second inclined surface 42, the third inclined surface 43, and the fourth inclined surface 44 intersect on the same straight line L. Compared with the point contact of the prior art, this line contact structure increases the contact area, makes the pressure distribution more uniform, and enhances the structural strength and wear resistance of the wedge-shaped protrusion unit 4, thereby extending the overall service life of the roller.

[0027] Specifically, the first inclined surface 41, the second inclined surface 42, the third inclined surface 43, and the fourth inclined surface 44 are connected end to end in a clockwise order. The second inclined surface 42 and the fourth inclined surface 44 are symmetrical about the central longitudinal axis P of the first inclined surface 41, and the second inclined surface 42 and the fourth inclined surface 44 are inclined towards each other. The first inclined surface 41 is an arc surface, and the outer diameter of the arc surface is smaller than the outer diameter of the convex ring 2. The first inclined surface 41 is not a gripping surface, thus making the contact between the first inclined surface 41 and the cable more gentle.

[0028] The third inclined surface 43 is inclined from the working surface 6 toward the interior of the feed trough 3. That is, the angle between the third inclined surface 43 and the central axis of the shaft 1 is less than 90 degrees. The first inclined surface 41 is slightly inclined relative to the central axis of the shaft 1, and the first inclined surface 41 provides support to the third inclined surface 43. The first inclined surface 41 and the third inclined surface 43 form a shallow hook facing into the feed trough 3. This inclined shallow hook structure allows the third inclined surface 43 to better hook the cable when conveying the cable, providing strong grip and preventing slippage.

[0029] The second inclined surface 42 and the fourth inclined surface 44 of two adjacent wedge-shaped protrusion units 4 together form an outwardly expanding flared structure 5. In this embodiment, the flared structure 5 is a V-shaped structure without a sharp bottom. The wedge-shaped protrusion unit 4 formed by the flared structure 5 has no sharp apex angle, which can guide insulation debris to slide outward when the cable is released, instead of being hooked and retained, effectively reducing the accumulation of debris in the feed trough 3.

[0030] On the working surface 6 of the same convex ring 2, wedge-shaped protrusions 4 in different rows are staggered in the axial direction. This staggered arrangement forms a more complex friction path, which can adapt to cables of different diameters and materials, ensuring the stability of gripping and conveying.

[0031] The height of the wedge-shaped protrusions 4 gradually decreases from the opening of the feed trough 3 towards the bottom. That is, the row of wedge-shaped protrusions 4 closest to the opening is the tallest, and the row closest to the bottom is the shortest. Simultaneously, the cross-sectional area of ​​the wedge-shaped protrusions 4 gradually decreases from the opening of the feed trough 3 towards the bottom. This ensures uniform and stable friction with the cable when it is pressed into the feed trough 3, preventing stress concentration and slippage, and improving the peeling quality.

[0032] Example 2: This example is basically the same in structure as Example 1, with the main difference being that in this example, the first inclined surface 41, the second inclined surface 42, the third inclined surface 43, and the fourth inclined surface 44 converge at a single vertex. This vertex structure ensures sufficient gripping force while still avoiding stress concentration problems caused by sharp vertices in the prior art through the smooth transition of multiple inclined surfaces.

[0033] Meanwhile, the flared structure 5 formed by two adjacent wedge-shaped protrusions 4 is a trumpet-shaped structure. The trumpet-shaped structure provides a gentler chip guide slope, further optimizing the chip discharge effect.

[0034] Furthermore, on the working surface 6 of the same convex ring 2, wedge-shaped protrusion units 4 in different rows are aligned axially. This arrangement facilitates manufacturing and provides stable and reliable performance when dealing with cables of specific specifications.

[0035] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A lower shaft of a wire stripping machine, comprising a shaft body (1), wherein a plurality of protruding rings (2) are arranged axially at non-equidistant intervals on the shaft body (1), and adjacent protruding rings (2) and the surface of the shaft body (1) form a feed groove (3) for accommodating and conveying cables, wherein the sidewall of the protruding rings (2) is a working surface (6), characterized in that: The working surface (6) is provided with a number of wedge-shaped protrusion units (4) evenly distributed along the circumference. Each wedge-shaped protrusion unit (4) is arranged in multiple rows along the axial direction of the protrusion ring (2), and the wedge-shaped protrusion units (4) in the same row are aligned in the axial direction. The wedge-shaped protrusion unit (4) includes a first inclined surface (41), a second inclined surface (42), a third inclined surface (43), and a fourth inclined surface (44). The first inclined surface (41), the second inclined surface (42), the third inclined surface (43) and the fourth inclined surface (44) are connected end to end in clockwise order; and the second inclined surface (42) and the fourth inclined surface (44) are symmetrical about the central longitudinal axis of the first inclined surface (41).

2. The lower shaft of a wire stripping machine according to claim 1, characterized in that: The first inclined surface (41), the second inclined surface (42), the third inclined surface (43) and the fourth inclined surface (44) converge at a vertex.

3. The lower shaft of a wire stripping machine according to claim 1, characterized in that: The first inclined surface (41), the second inclined surface (42), the third inclined surface (43) and the fourth inclined surface (44) intersect on the same straight line.

4. The lower shaft of a wire stripping machine according to claim 1, characterized in that: On the working surface (6) of the same convex ring (2), wedge-shaped protrusion units (4) of different rows are staggered or aligned in the axial direction.

5. The lower shaft of a wire stripping machine according to claim 1, characterized in that: The height of the wedge-shaped protrusion unit (4) gradually decreases from the opening of the feed trough (3) toward the bottom of the trough.

6. The lower shaft of a wire stripping machine according to claim 1, characterized in that: The cross-sectional area of ​​the wedge-shaped protrusion unit (4) gradually decreases from the opening of the feed trough (3) toward the bottom of the trough.

7. The lower shaft of a wire stripping machine according to claim 1, characterized in that: The first inclined surface (41) is an arc surface, and the outer diameter of the first inclined surface (41) is smaller than the outer diameter of the convex ring (2).

8. The lower shaft of a wire stripping machine according to claim 7, characterized in that: The third inclined surface (43) is inclined from the working surface (6) toward the inside of the feed trough (3).

9. The lower shaft of a wire stripping machine according to claim 8, characterized in that: The second inclined surface (42) and the fourth inclined surface (44) of two adjacent wedge-shaped protrusion units (4) together form an outwardly expanding flared structure (5).

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