Wire core separation-preventing blowing device and cable production method

Abstract

The invention belongs to the technical field of cable production, and discloses a cable core anti-separation blowing device and a cable production method. The device comprises an air blowing part, a supporting part and an air supply assembly, the air blowing part is provided with an air blowing groove, the air blowing groove can blow air towards a die sleeve opening of the extrusion die, and the supporting part is connected to the air blowing part and can move relative to the extrusion die so as to change the linear distance and / or the relative angle between the air blowing part and the extrusion die. The air supply assembly is connected to the air blowing part and can supply air to the air blowing part. According to the cable core material separation prevention blowing device, impurities can be separated from a die sleeve opening and a cable in a blowing mode, so that it is ensured that no impurities remain on the surface of a cable body, a product has the excellent appearance quality, and the electrical performance and the mechanical performance of the product are guaranteed. Meanwhile, the whole cable core material separation prevention blowing device is simple in structure and low in cost, and the blowing effect can be adjusted, so that the material separation prevention requirements of different products are met.

Description

Technical Field

[0001] The present invention relates to the technical field of cable production, and particularly relates to a wire core anti-segregation blowing device and a cable production method. Background Art

[0002] In the field of extrusion production, the treatment and processing of raw materials are key links to ensure product quality. However, in the actual production process, various impurities and particulate molecules are inevitably mixed into the raw materials. These impurities often cannot be completely melted during the melting process of the raw materials, but remain in their original solid state. When the melted material is extruded through an extrusion device, these unmelted impurities will flow out with the material, having an adverse impact on the final quality of the product.

[0003] Especially during the production process of a tandem production line, due to the fast extrusion speed and continuous production without stopping, this problem becomes particularly prominent. In the insulation extrusion process, due to the high extrusion pressure and fast speed, unmelted impurities are more likely to precipitate and accumulate at the die sleeve opening, forming so-called "segregation accumulation". This segregation accumulation not only affects the appearance quality of the product, but may also have potential impacts on the electrical properties, mechanical properties, etc. of the product, thereby reducing the overall quality of the product.

[0004] In response to this problem, the industry has tried to solve it through simple die improvements. However, practice has shown that this improvement method has limited effects and cannot fundamentally solve the segregation problem. At the same time, although customizing a special die may improve the segregation situation to a certain extent, its cost is high and the effect is not always significant. Therefore, it is not an economically effective solution.

[0005] Therefore, there is an urgent need for a wire core anti-segregation blowing device and a cable production method to solve the above technical problems. Summary of the Invention

[0006] An object of the present invention is to provide a wire core anti-segregation device that can timely remove the impurities precipitated and accumulated at the die sleeve opening and ensure the production quality of the extrusion process.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A wire core anti-segregation blowing device, comprising:

[0009] A blowing member, the blowing member is provided with a blowing groove, and the blowing groove can blow air towards the die sleeve opening of the extrusion die;

[0010] A support member, the support member is connected to the blowing member, and the support member can move relative to the extrusion die to change the linear distance and / or relative angle between the blowing member and the extrusion die;

[0011] A gas supply assembly, which is connected to the blowing member and can supply gas to the blowing member. The gas supply assembly includes a first valve and a second valve. The first valve is used to adjust the pressure of the gas, and the second valve is used to enable the gas supply assembly to intermittently supply the gas.

[0012] Preferably, the length of the blowing groove is not less than 10 mm and the width is not greater than 2 mm.

[0013] Preferably, the length of the blowing groove is not less than 14 mm and the width is not greater than 1.2 mm.

[0014] Preferably, the support member includes a position adjustment rod and a base. The base can be placed on a preset fixed surface and change the linear distance between the blowing member and the extrusion die along the preset fixed surface. The position adjustment rod is connected between the base and the blowing member. The position adjustment rod can adjust the position of the blowing member along at least one of a preset first direction, a preset second direction, and a preset third direction. The preset first direction is the axial direction of the die sleeve opening. The preset first direction, the preset second direction, and the preset third direction are perpendicular to each other.

[0015] Preferably, the support member further includes an angle adjustment rod. The angle adjustment rod is connected between the base and the blowing member. The angle adjustment rod can change the blowing direction of the blowing member.

[0016] Advantages of the present invention: Through the above-mentioned core anti-bleeding blowing device, impurities precipitated during the extrusion process can be separated from the die sleeve opening and the cable by blowing, so as to ensure that there are no impurities remaining on the surface of the extruded wire body, making the product have better appearance quality, and ensuring the electrical performance and mechanical performance of the product. At the same time, the structure of the entire core anti-bleeding blowing device is simple, the cost is low, and the blowing effect can be adjusted by changing the linear distance or relative angle between the blowing member and the extrusion die, and by changing the gas pressure, intermittently supplying gas, etc., so as to meet the anti-bleeding requirements of different products.

[0017] Another object of the present invention is to provide a cable production method, which can timely remove impurities precipitated and accumulated at the die sleeve opening and ensure the production quality of the extrusion process.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A cable production method, including:

[0020] An extrusion layer is formed outside the core using an extrusion die, and the above-mentioned core anti-bleed air-blowing device is used to blow air towards the die sleeve opening of the extrusion die for cleaning.

[0021] Preferably, air is blown towards the die sleeve opening along a preset blowing direction, and the preset blowing direction forms an angle of 40° - 50° with the axial direction of the die sleeve opening.

[0022] Preferably, a gas with a pressure of 0.4MPa - 0.6MPa is supplied to the blowing member of the core anti-bleed air-blowing device for air-blowing cleaning; and / or,

[0023] The straight-line distance between the blowing member and the die sleeve opening is controlled to be not less than 4mm and not more than 6mm.

[0024] Preferably, intermittent air-blowing is performed according to a single air-blowing time of 0.5s - 1.5s and an air-blowing interval time of 5s - 10s.

[0025] Preferably, the height position of the blowing member is lower than the die sleeve opening.

[0026] Advantages of the present invention: By means of air-blowing, impurities precipitated during the extrusion process can be separated from the die sleeve opening and the cable, thereby ensuring that there are no residual impurities on the surface of the extruded wire body, making the product have better appearance quality, and ensuring the electrical performance and mechanical performance of the product. At the same time, the required air-blowing structure of this method is simple and the cost is low, which is beneficial to reducing the production cost of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the core anti-bleed air-blowing device provided in the present invention;

[0028] Figure 2 is a schematic diagram of the blowing direction.

[0029] In the figure:

[0030] 1. First valve; 2. Air delivery pipe; 3. Blowing member; 4. Support member; 5. Second valve; 6. Die sleeve opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, not all structures.

[0032] In the description of the present invention, unless otherwise clearly specified and defined, the terms "connected", "connected to", "fixed", and "abutted" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0034] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "right", and "left" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] The following will introduce Figures 1 to 2 the wire core anti-bleeding blowing device and the cable production method provided by the present invention.

[0036] As Figure 1 shown, in this embodiment, the wire core anti-bleeding blowing device includes a blowing member 3, a supporting member 4, and a gas supply assembly. Among them, the blowing member 3 is provided with a blowing groove, and gas can be blown out from the blowing groove towards the die sleeve opening 6 of the extrusion die within a preset range, so as to clean when contacting the impurities accumulated at the die sleeve opening 6, separate the impurities from the extrusion die and the wire body, and achieve the effect of preventing bleeding. Exemplarily, the blowing groove can adopt shapes such as a square groove or a waist-shaped groove, its length is not less than 10 mm, and its width is not more than 2 mm, so that the gas can be blown out in a linear shape (that is, the length is at least more than 5 times the width). Of course, after blowing out a certain distance, since the gas will gradually diffuse and is difficult to measure, only the length and width dimensions of the blowing groove are limited in the present invention, thereby realizing the limitation of the gas range.

[0037] The top end of the support member 4 can be connected to the blowing member 3 to support the blowing member 3, and the support member 4 can move relative to the extrusion die, so as to change the linear distance and / or relative angle between the blowing member 3 and the extrusion die, meeting the requirements of blowing and cleaning impurities in different situations. Exemplarily, in this embodiment, through the support member 4, the depth direction of the blowing groove and the axis direction of the die sleeve opening 6 are arranged at a certain angle, and the gas can be separated by the wire body when it blows to the die sleeve opening 6. In this way, due to the influence of the wire body, the gas will form an approximately annular air flow at the die sleeve opening 6, realizing a more effective cleaning of the accumulated impurities.

[0038] The gas supply assembly is connected to the blowing member 3 and can supply gas to the blowing member 3. After the gas enters the blowing member 3, it can be blown out towards the die sleeve opening 6 of the extrusion die in a preset direction under the constraint of the blowing groove. And the gas supply assembly further includes a first valve 1 and a second valve 5. The first valve 1 is used to adjust the pressure of the gas, and the second valve 5 can control the intermittent gas supply of the gas supply assembly, so as to meet the blowing and cleaning requirements in different situations. Exemplarily, in this embodiment, the first valve 1 adopts a pressure regulating valve, and the second valve 5 adopts an electromagnetic switch valve. The pressure regulating valve, the electromagnetic switch valve and the blowing member 3 are connected through an air pipe 2, and the pressure regulating valve is connected to the gas supply device configured in the production workshop.

[0039] Through the above-mentioned wire core anti-bleed blowing device, the impurities precipitated during the extrusion process can be separated from the die sleeve opening 6 and the cable by blowing, so as to ensure that there are no impurities remaining on the surface of the extruded wire body, making the product have better appearance quality, and ensuring the electrical performance and mechanical performance of the product. At the same time, the structure of the whole wire core anti-bleed blowing device is simple, the cost is low, and the blowing effect can be adjusted by changing the linear distance or relative angle between the blowing member 3 and the extrusion die, and by changing the gas pressure, intermittent gas supply, etc., so as to meet the anti-bleed requirements of different products.

[0040] Preferably, in this embodiment, the length of the blowing groove is not less than 14 mm, and the width is not more than 1.2 mm. Such a size setting enables the blowing member 3 to meet the anti-bleed requirements in the production of wire bodies below 25 mm 2 and is easy to manufacture, thus reducing the manufacturing cost of the blowing member 3.

[0041] Such as Figure 1As shown, in this embodiment, the base of the support member 4 can be placed on a preset fixed surface (such as the ground) and change the linear distance between the blowing member 3 and the extrusion die along the preset fixed surface. It can be understood that when the linear distance between the blowing member 3 and the extrusion die is smaller, the effect of stripping and cleaning impurities by the gas is stronger, and there is a greater possibility of damaging the surface of the wire body. On the contrary, when the linear distance between the blowing member 3 and the extrusion die is larger, the effect of stripping and cleaning impurities by the gas will be weaker, which is likely to result in incomplete cleaning. Of course, the linear distance and the pressure of the above gas are related variables. Exemplarily, in this embodiment, when the linear distance between the blowing member 3 and the die sleeve opening 6 is not less than 4 mm and not more than 6 mm, and the gas pressure is 0.4 MPa - 0.6 MPa, a better effect of cleaning impurities and preventing material bleeding can be achieved without damaging the wire body.

[0042] Continue to refer to Figure 1 As shown, the support member 4 further includes a position adjusting rod, which is connected between the base and the blowing member 3. The position adjusting rod can adjust the position of the blowing member 3 along at least one of a preset first direction, a preset second direction, and a preset third direction. Among them, the preset first direction is the axial direction of the die sleeve opening 6, and the preset first direction, the preset second direction, and the preset third direction are perpendicular to each other. Exemplarily, in this embodiment, the support member 4 further includes a support rod and at least one position adjusting rod. The support rod is arranged vertically and fixedly connected to the base. One end of the position adjusting rod is provided with a through hole, and the support rod passes through the through hole. The other end of the position adjusting rod is connected to the blowing member 3, and the position adjusting rod can adjust the height position along the support rod. The position adjusting rod is also provided with a threaded hole, which is communicated with the through hole. When the position adjusting rod is adjusted to the appropriate height, the position adjusting rod can be fixed by screwing a bolt into the threaded hole and pressing it against the support rod. When the height needs to be adjusted again, only unscrew the bolt.

[0043] Of course, in some embodiments, the effect of adjusting the blowing member 3 in the preset first direction, preset second direction, and preset third direction can also be achieved by sequentially passing multiple position adjusting rods. Exemplarily, the first position adjusting rod is sleeved on the support rod through its perforation, and the axial direction of the first position adjusting rod is set along the preset first direction. The second position adjusting rod is sleeved on the first adjusting rod through its perforation, and the axial direction of the second position adjusting rod is set along the preset second direction. The third position adjusting rod is sleeved on the second position adjusting rod through its perforation, and the axial direction of the third position adjusting rod is set along the preset third direction. The blowing member 3 is connected to the third position adjusting rod. In this way, by correspondingly changing the connection positions between the position adjusting rod and the support rod and between the position adjusting rods, the blowing member 3 can be adjusted in at least one of the preset first direction, preset second direction, and preset third direction.

[0044] Further, in this embodiment, the support member 4 further includes an angle adjusting rod. The angle adjusting rod is connected between the base and the blowing member 3, and the angle adjusting rod can change the blowing direction of the blowing member 3. Refer to Figure 1 As shown, a position adjusting rod is connected to the support rod. The position adjusting rod can adjust the height position of the blowing member 3 in the vertical direction, and the axial direction of the position adjusting rod is parallel to the horizontal plane. One end of the angle adjusting rod is provided with a perforation and can be rotatably sleeved on the position adjusting rod through the perforation, and the other end of the angle adjusting rod is connected to the blowing member 3. The angle adjusting rod is further provided with a threaded hole, and the threaded hole is communicated with the perforation. When the angle adjusting rod is rotated to a suitable angle, the angle adjusting rod can be fixed by screwing a bolt into the threaded hole and pressing it against the position adjusting rod. When it is necessary to adjust the relative angle between the blowing member 3 and the extrusion die again, only the bolt needs to be unscrewed.

[0045] The present invention also provides a method for producing a cable. The method for producing a cable includes:

[0046] Using an extrusion die to form an extrusion layer on the wire core, and using the above-mentioned wire core anti-bleeding air blowing device to blow air and clean the die sleeve opening 6 of the extrusion die.

[0047] Specifically, the extrusion layer can be either an insulating layer, a sheath layer, or a layer structure with other specific functions. In the present invention, no specific limitation is made thereto, as long as it is formed by an extrusion process.

[0048] By means of blowing air, the impurities precipitated during the extrusion process can be separated from the die sleeve opening 6 and the cable, thereby ensuring that no impurities remain on the surface of the extruded wire body, making the product have better appearance quality, and ensuring the electrical performance and mechanical performance of the product. At the same time, the blowing structure required by this method is simple and the cost is low, which is beneficial to reducing the production cost of the cable.

[0049] Specifically, the cable production method further includes:

[0050] Blowing air towards the die sleeve opening 6 along a preset blowing direction, and the preset blowing direction forms an angle of 40°-50° with the axial direction of the die sleeve opening 6.

[0051] Specifically, referring to Figure 2 shown, taking the axial direction of the die sleeve opening 6 as the horizontal direction as an example, the preset blowing direction can either be an angle of 40°-50° from top to bottom, or an angle of 40°-50° from bottom to top (as shown by α in Figure 2 , and the arrow direction in Figure 2 is the gas flow direction), or an angle of 40°-50° from left to right, or an angle of 40°-50° from right to left, or an inclined angle of 40°-50°. All these angles can make the blowing achieve a better cleaning effect and fall within the scope protected by the present invention. And it should be noted that when the angle is greater than 50°, the pressure of the gas on the cable is too large, which is likely to cause eccentricity or damage to the insulation layer. When the angle is less than 40°, the ability of the gas to peel off impurities is poor, and the effect of removing impurities cannot be effectively achieved.

[0052] Preferably, the height position of the blowing member 3 is set lower than the die sleeve opening 6, and blowing is performed from bottom to top. Under the action of gravity, impurities are easily accumulated below the die sleeve opening 6 and below the cable, while there are fewer impurities above the die sleeve opening 6 and above the cable. Therefore, blowing from bottom to top can more efficiently utilize the airflow to peel off impurities and avoid interference between the blowing member 3 and the cable.

[0053] Optionally, the cable production method further includes:

[0054] Supplying gas with a pressure of 0.4 MPa - 0.6 MPa to the blowing member 3 of the core anti-segregation blowing device for blowing and cleaning.

[0055] Supplying gases with different pressures can also change the ability of the gas to peel off impurities during blowing. For cables with a thicker extrusion layer, more impurities will accumulate during production, and a larger supply pressure, such as 0.6 MPa, can be adopted; for cables with a thinner extrusion layer, fewer impurities will accumulate during production, and a smaller supply pressure, such as 0.4 MPa, can be adopted.

[0056] Optionally, the cable production method further includes:

[0057] Controlling the linear distance between the blowing member 3 and the die sleeve opening 6 to be not less than 4 mm and not more than 6 mm.

[0058] Specifically, when the straight-line distance between the air-blowing member 3 and the die sleeve opening 6 is less than 4 mm, the wire body is liable to be damaged due to air pressure or interference between the air-blowing member 3 and the wire body. When the straight-line distance between the air-blowing member 3 and the die sleeve opening 6 is greater than 6 mm, the gas will diffuse significantly, and the ability to strip impurities will be weakened. Even with a supply pressure of 0.6 MPa, it is difficult to ensure a relatively thorough removal of impurities.

[0059] Further, the cable production method further includes:

[0060] Performing intermittent air-blowing in the manner of an air-blowing time of 0.5 s - 1.5 s per time and an air-blowing interval time of 5 s - 10 s.

[0061] Specifically, through the second valve 5, the gas impact force generated by the intermittent air-blowing can be utilized to separate impurities from the extrusion die and the cable. It should be noted that when the air-blowing time per time is less than 0.5 s, the impact force may be insufficient, and the effect of stripping impurities is poor. When the air-blowing time per time exceeds 1.5 s, it will result in waste of gas. When the air-blowing interval time is less than 5 s, it will not cause obvious influence on the cable, but the second valve 5 will act frequently and requires regular maintenance. When the air-blowing interval time is longer than 10 s, the accumulated impurities cannot be removed in time, resulting in excessive impurities.

[0062] Month 1 2 3 4 5 6 7 8 9 Statistics of the number of bulges in the pre-use material separation (times) 15 12 10 11 17 14 / / / Statistics of the number of bulges in the post-use material separation (times) / / / / / / 0 0 1

[0063] Table 1. Statistics of the number of material analysis per month

[0064] After using the above-mentioned air-blowing device and production method, as shown in Table 1, the number of material analysis bulges has been greatly reduced, from more than 10 times per month on average to less than 1 time per month on average, which can significantly improve the material analysis phenomenon, ensure that the product has better appearance quality, and guarantee the electrical performance and mechanical performance of the product.

[0065] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A wire core anti-segregation material blowing device, characterized in that: include: A blowing piece (3), wherein the blowing piece (3) is provided with a blowing groove, and the blowing groove is capable of blowing toward a mold sleeve opening (6) of an extrusion mold; A support member (4), the support member (4) being connected to the blowing member (3), and the support member (4) being movable relative to the extrusion die so as to change the linear distance and / or relative angle between the blowing member (3) and the extrusion die; An air supply component is connected to the blowing member (3) and is capable of supplying gas to the blowing member (3), and the air supply component comprises a first valve (1) and a second valve (5), the first valve (1) is used to adjust the pressure of the gas, and the second valve (5) is used to enable the air supply component to intermittently supply the gas.

2. The wire core anti-segregation material blowing device according to claim 1, characterized in that: The length of the blowing slot is not less than 10 mm, and the width is not more than 2 mm.

3. The wire core anti-segregation material blowing device according to claim 2, characterized in that: The length of the blowing slot is not less than 14 mm, and the width is not more than 1.2 mm.

4. The wire core anti-segregation material blowing device according to claim 1, characterized in that: The support member (4) comprises a position adjustment rod and a base, the base can be placed on a preset fixed surface and change the linear distance between the blowing member (3) and the extrusion mold along the preset fixed surface, the position adjustment rod is connected between the base and the blowing member (3), and the position adjustment rod can adjust the position of the blowing member (3) along at least one of a preset first direction, a preset second direction and a preset third direction, the preset first direction is the axial direction of the mold sleeve (6), and the preset first direction, the preset second direction and the preset third direction are arranged perpendicular to each other.

5. The wire core anti-segregation material blowing device according to claim 4, characterized in that: The support member (4) further comprises an angle adjustment rod, wherein the angle adjustment rod is connected between the base and the blowing member (3), and the angle adjustment rod is capable of changing the blowing direction of the blowing member (3).

6. A cable production method, characterized in that: include: An extrusion die is used to form an extrusion layer outside the wire core, and a wire core anti-segregation material blowing device as described in any one of claims 1 to 5 is used to blow air toward the mold sleeve port (6) of the extrusion die to clean it.

7. The cable production method according to claim 6, characterized in that: Air is blown toward the mold sleeve opening (6) along a preset blowing direction, wherein the preset blowing direction forms an angle of 40°-50° with the axial direction of the mold sleeve opening (6).

8. The cable production method according to claim 7, characterized in that: Supplying gas with a pressure of 0.4MPa-0.6MPa to the blowing component (3) of the wire core anti-segregation material blowing device to perform blowing cleaning; and / or, The straight-line distance between the blowing piece (3) and the mold sleeve opening (6) is controlled to be no less than 4 mm and no more than 6 mm.

9. The cable production method according to claim 8, characterized in that: Intermittent blowing is performed with a single blowing time of 0.5s-1.5s and a blowing interval of 5s-10s.

10. The cable production method according to claim 7, characterized in that: The height position of the blowing member (3) is lower than the mold sleeve opening (6).

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