A TPE halogen-free flame-retardant cable injection molding device and its injection molding method

Abstract

The present invention discloses a TPE halogen-free flame-retardant cable injection molding device and an injection molding method thereof, belonging to the field of stranded cable injection molding. It includes an injection molding machine and an integrated cable. At the top of the injection molding machine, there is a feeding cylinder, and at the bottom of the feeding cylinder, there is a hot-melt sleeve. Inside the hot-melt sleeve, there is an extrusion component. Inside the injection molding machine, there is a cable injection pressing mechanism and a cable injection positioning mechanism. The cable injection pressing mechanism includes an injection sleeve arranged on the right side of the injection molding machine, and a cable conveying support is arranged on the back of the injection sleeve. When the integrated cable is moved along between the cable sorting wheel and the cable fitting, the outer side of the protection positioning column is extruded, so that stable grooves fitting the integrated cable appear on its outer surface. When injecting the protective layer, the integrated cable is stabilized inside the protection positioning column, and the distance from the protective layer is the same, avoiding the unstable position of the integrated cable, which may lead to too large differences in the thickness of each part of the protective layer.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding of stranded cables, and particularly relates to a TPE halogen-free flame-retardant cable injection molding device and an injection molding method thereof. Background Art

[0002] TPE, also known as thermoplastic elastomer, is a kind of polymer material that has both the characteristics of plastics and rubbers. It shows high elasticity of rubber at normal temperature and can be plasticized and molded at high temperature. During the injection molding process of cables, the cables need to be pre-stranded first, and then the TPE raw materials are supplemented into the injection molding device. The raw materials are melted by a hot melting mechanism and then covered on the outer surface of the stranded cables to complete the injection molding of the jacket for the stranded and bare cables.

[0003] During daily use, after injecting a layer of TPE material jacket on the stranded cables, it is often necessary to wrap multiple stranded cables inside a protective layer and integrate the multiple combined cables through a total cable jacket. However, when the existing injection molding device combines multiple cables together, the placement positions of the pre-injected cables are prone to shift and squeeze each other when combined, resulting in uneven thickness of the protective layer from the total cable jacket. When filling materials are squeezed on the outer surface of the total cable and press the cables, the thinner side of the protective layer is over-squeezed. Moreover, when covering the protective layer, due to the relatively smooth outer surface of the pre-injected cables, there is an easy problem of insufficient firm adhesion, resulting in the shift of the adhered part and the shift of the internal cables, which is not conducive to the maintenance operation of the cables during actual use.

[0004] Therefore, we propose a TPE halogen-free flame-retardant cable injection molding device and an injection molding method thereof. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that when covering the outer jacket of multiple cables together, the existing injection molding device has uneven thickness of the protective layer during injection molding of the protective layer and cannot make the protective layer closely fit with multiple cables, resulting in a reduction in the voltage resistance performance and maintenance convenience of the cables during actual use. A TPE halogen-free flame-retardant cable injection molding device and an injection molding method thereof are proposed.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A TPE halogen-free flame-retardant cable injection molding device includes an injection molding machine and an integrated cable. A feeding cylinder is arranged at the top of the injection molding machine. A hot melting sleeve is arranged at the bottom of the feeding cylinder. An extrusion component is arranged inside the hot melting sleeve. A cable injection pressing mechanism is arranged inside the injection molding machine. A cable injection positioning mechanism is arranged inside the injection molding machine;

[0008] The cable injection molding and pressing mechanism includes an injection sleeve arranged on the right side of the injection molding machine. A cable conveying bracket is arranged on the back of the injection sleeve. A traction motor is arranged on the front of the injection sleeve. A wire winding column is arranged on the output shaft of the traction motor. A cable sorting wheel is arranged on the inner wall of the cable conveying bracket. A pressing groove is arranged on the outer side of the cable sorting wheel.

[0009] The cable injection molding positioning mechanism includes a positioning column conveying bracket arranged inside the cable conveying bracket. A cable mating wheel that fits with the cable sorting wheel is arranged on the inner wall of the positioning column conveying bracket. A protective positioning column whose outer surface fits with the inner side of the integrated cable is arranged on the inner wall of the positioning column conveying bracket. And an injection annular groove is arranged at the bottom of the injection sleeve.

[0010] Preferably, a cooling and shaping sleeve is arranged at the bottom of the injection molding machine. An integrated cable with a protective layer is arranged at the bottom of the injection sleeve. An extrusion fitting wheel that fits with the integrated cable with the protective layer is arranged inside the cooling and shaping sleeve.

[0011] Preferably, the outer surface of the cable sorting wheel fits with the outer surface of the integrated cable. The rotation position of the cable sorting wheel is fixed. And a plurality of the cable sorting wheels are rotationally symmetrically distributed on the inner wall of the cable conveying bracket.

[0012] Preferably, the positioning column conveying bracket is arranged in a circular ring shape. And a rolling telescopic groove is formed on the inner wall of the positioning column conveying bracket.

[0013] Preferably, a rolling shaft that is slidably connected with the rolling telescopic groove is arranged outside the rotation center of the cable mating wheel. And a compression spring is sleeved on the outer surface of the rolling shaft.

[0014] Preferably, a pressing mating strip is arranged on the outer side of the cable mating wheel. And the cable mating wheels are rotationally distributed on the inner wall of the positioning column conveying bracket. The inner side of the cable mating wheel fits with the protective positioning column.

[0015] An injection molding method for a TPE halogen-free flame-retardant cable injection molding device includes the following injection molding steps:

[0016] Step S1: Injection feeding. Put the TPE halogen-free material into the inside of the feeding cylinder. Melt the TPE halogen-free material through the hot melt sleeve. And inject the molten plastic into the inside of the injection sleeve through the extrusion component to complete the injection feeding.

[0017] Step S2: Injection Molding Pressing. Move the integrated cable into the cable conveying bracket through the traction motor, and press the outer surface of the protective positioning post according to the number of integrated cables to be injection molded, so that the grooves on the outer surface of the protective positioning post fit the integrated cable. At the same time, press the outer side of the integrated cable through the cable arranging wheel to make stripe grooves appear, completing the cable pressing operation before injection molding;

[0018] Step S3: Integrated Injection Molding. After the integrated cable fits on the outer surface of the protective positioning post, move to the other side of the injection molding annular groove, and coat the integrated cable of the protective layer with the protective layer material extruded by the injection sleeve;

[0019] Step S4: Cooling and Shaping. Cool the injection molded protective layer through the cooling spray pipe inside the temperature reduction shaping sleeve to make it tightly wrap around the cable;

[0020] Step S5: Forming and Rewinding. Rewind the transportation cable on the outer surface of the take-up post to complete the rewind operation of the protective layer.

[0021] Preferably, in step S2, the number of fitting grooves on the outer surface of the protective positioning post depends on the number of integrated cables, and the outer surface of the protective positioning post is pressed by the pressing fit strip to make sunken stripe grooves appear on the surface, which can avoid slipping when the integrated cable is fitted to the outer surface of the protective positioning post.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Aiming at the problem that the thickness of the protective layer is uneven when the existing injection molding equipment injects the protective layer, by setting devices such as a cable conveying bracket, a positioning conveying bracket, and a protective positioning post to cooperate with each other, when the integrated cable moves along the cable arranging wheel and the cable mating, press the outside of the protective positioning post to make stable grooves that fit the integrated cable appear on its outer surface, so that when injecting the protective layer, the integrated cable is stable inside the protective positioning post and has the same distance from the protective layer, avoiding the unstable position of the integrated cable, resulting in too large differences in the thickness of each part of the protective layer and reducing the voltage resistance performance of each part of the formed cable.

[0024] 2. Aiming at the problem that the cable cannot be firmly adhered due to the smooth outer surface of the cable during injection molding of the injection molding equipment, by setting devices such as a cable conveying bracket, a traction motor, and a cable arranging wheel to cooperate with each other, when the integrated cable passes between the cable arranging wheel and the cable mating wheel, press the outer and inner sides of the cable in different directions to make it fit tightly with the protective layer when the protective layer is coated, increasing the integrity of the protective layer and the integrated cable. Description of the Drawings

[0025] Figure 1Flow chart of the protective layer injection molding method for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0026] Figure 2 Overall structural schematic diagram of the injection molding machine for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0027] Figure 3 Internal structural schematic diagram of the cooling and shaping sleeve for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0028] Figure 4 Fitting schematic diagram of the protective positioning post and the integrated cable structure after positioning for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0029] Figure 5 For the present invention Figure 2 Enlarged view of the structure at A in

[0030] Figure 6 Structural schematic diagram of the cable sorting wheel for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0031] Figure 7 Structural schematic diagram of the cable mating wheel for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention;

[0032] Figure 8 Sleeved schematic diagram of the rolling shaft and the compression spring structure for a TPE halogen-free flame-retardant cable injection molding device and its injection molding method proposed by the present invention.

[0033] In the figure: 1. Injection molding machine; 11. Feeding cylinder; 12. Hot melt sleeve; 2. Cable injection pressing mechanism; 21. Injection sleeve; 22. Cable conveying support; 23. Traction motor; 24. Cable sorting wheel; 3. Cable injection positioning mechanism; 31. Positioning post conveying support; 32. Cable mating wheel; 321. Rolling shaft; 322. Compression spring; 33. Protective positioning post; 4. Integrated cable; 5. Cooling and shaping sleeve; 51. Extrusion fitting wheel. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] Refer toFigure 2-8 , a TPE halogen-free flame-retardant cable injection molding device, including an injection molding machine 1 and an integrated cable 4. At the top of the injection molding machine 1, there is a feeding cylinder 11. At the bottom of the feeding cylinder 11, there is a hot-melt sleeve 12. Inside the hot-melt sleeve 12, there is an extrusion component. Inside the injection molding machine 1, there is a cable injection molding and pressing mechanism 2, and inside the injection molding machine 1, there is a cable injection molding positioning mechanism 3;

[0036] Through the above technical solution, when injecting a protective layer on the outer surface of multiple integrated cables 4, the TPE material is injected into the inside of the feeding cylinder 11. Through the electric heating chamber arranged inside the hot-melt sleeve 12, the raw material is melted, and the molten plastic after melting is injected into the injection sleeve 21 through the extrusion component, that is, the screw conveyor pump. Then, the outer surface of the integrated cable 4 is pressed by the cable injection molding and pressing mechanism 2, so that the protective layer after injection can better adhere to the outer surface of the cable and prevent sliding. Then, the cable injection molding positioning mechanism 3 positions the conveying of the cable, so that the distance between the outside of the integrated cable 4 and the protective layer is the same, and the integrated cable 4 is uniformly stressed during the subsequent use of the cable, completing the operations of injection molding and positioning of the integrated cable 4.

[0037] Embodiment 1

[0038] This embodiment is a cable injection molding and pressing mechanism of a TPE halogen-free flame-retardant cable injection molding device;

[0039] As Figure 2-6 shown, the cable injection molding and pressing mechanism 2 includes an injection sleeve 21 arranged on the right side of the injection molding machine 1. On the back of the injection sleeve 21, there is a cable conveying bracket 22. On the front of the injection sleeve 21, there is a traction motor 23. The output shaft of the traction motor 23 is provided with a wire winding post. Inside the inner wall of the cable conveying bracket 22, there is a cable sorting wheel 24. On the outside of the cable sorting wheel 24, there is a pressing groove;

[0040] Through the above technical solution, the injection sleeve 21 is communicated with the hot-melt sleeve 12 and is provided with an annular injection groove to inject the protective layer on the outer surface of the cable sliding inside the annular injection groove. During this period, the integrated cable 4 is constrained by the cable conveying bracket 22, and the integrated cable 4 is tractioned forward by the traction motor 23. At the same time, the outer side of the integrated cable 4 is pressed with a stripe groove that fits the protective layer through the cable sorting wheel 24, completing the operation of pressing the integrated cable 4.

[0041] Specifically, at the bottom of the injection molding machine 1, there is a cooling and shaping sleeve 5. At the bottom of the injection sleeve 21, there is a protective layer integrated cable. Inside the cooling and shaping sleeve 5, there is an extrusion fitting wheel 51 that fits the protective layer integrated cable.

[0042] Through the above technical solution, when the integrated cable 4 passes through the injection port, after being covered by the protective layer, the existing cooling nozzle inside the cooling and shaping sleeve 5 is used to cool the integrated cable with the protective layer, and the extrusion and fitting wheel 51 is used to deflect the moving direction of the cable so that it can be collected on the outer surface of the take-up column.

[0043] Specifically, the outer surface of the cable arranging wheel 24 is in contact with the outer surface of the integrated cable 4. The rotation position of the cable arranging wheel 24 is fixed, and a plurality of cable arranging wheels 24 are rotationally symmetrically distributed on the inner wall of the cable conveying bracket 22.

[0044] Through the above technical solution, when it is necessary to inject the protective layer for several integrated cables 4, the integrated cables 4 to be injected can be passed through between the cable arranging wheel 24 and the cable matching wheel 32 to press the outer surface of the integrated cable 4.

[0045] Embodiment 2

[0046] This embodiment is a cable injection positioning mechanism of a TPE halogen-free flame-retardant cable injection molding device;

[0047] As Figure 2 、 Figure 7 and Figure 8 As shown, the cable injection positioning mechanism 3 includes a positioning column conveying bracket 31 arranged inside the cable conveying bracket 22. The inner wall of the positioning column conveying bracket 31 is provided with a cable matching wheel 32 that fits with the cable arranging wheel 24. The inner wall of the positioning column conveying bracket 31 is provided with a protective positioning column 33 whose outer surface fits with the inside of the integrated cable 4, and the bottom of the injection sleeve 21 is provided with an injection annular groove.

[0048] Through the above technical solution, when the integrated cable 4 passes between the cable arranging wheel 24 and the cable matching wheel 32, the outer surface of the protective positioning column 33 is pressed. Thus, when the integrated cable 4 and the protective positioning column 33 are synchronously conveyed into the injection sleeve 21, the outer surface of the integrated cable 4 is positioned, and through the extrusion arc groove adapted to the diameter of the integrated cable 4, the distance between the outer side of the integrated cable 4 and the protective layer is made the same, completing the positioning operation before the injection of the protective layer on the outer side of the integrated cable 4.

[0049] Specifically, the positioning column conveying bracket 31 is arranged in a circular ring shape, and a rolling telescopic groove is opened on the inner wall of the positioning column conveying bracket 31. A rolling shaft 321 slidably connected to the rolling telescopic groove is arranged outside the rotation center of the cable matching wheel 32, and a compression spring 322 is sleeved on the outer surface of the rolling shaft 321.

[0050] Through the above technical solution, when the integrated cable 4 is passed through between the cable arranging wheel 24 and the cable mating wheel 32, the compression spring 322 will be squeezed, causing it to slide inward along the rolling telescopic groove towards the inner side of the positioning post conveying bracket 31, and its rotation will be stabilized by the rolling shaft 321;

[0051] Based on the above, in the rolling telescopic groove without the injection molding of the protective layer, the cable arranging wheel 24 and the cable mating wheel 32 are in mutual contact, so that no pressure is generated on the cable mating wheel 32 towards the inner side of the positioning post conveying bracket 31, and no corresponding stable grooves will appear on the outer surface of the inner protective positioning post 33 here, achieving the effect of adjusting the stable grooves on the outer side of the protective positioning post 33 according to the number of integrated cables 4.

[0052] Specifically, a pressing mating strip is provided on the outer side of the cable mating wheel 32, and the cable mating wheel 32 is rotatably distributed on the inner wall of the positioning post conveying bracket 31, and the inner side of the cable mating wheel 32 is in contact with the protective positioning post 33.

[0053] Through the above technical solution, the pressing mating strip provided on the outer surface of the cable mating wheel 32 will press a strip-shaped column that fits the protective positioning post 33 on the inner side of the integrated cable 4, so that when the integrated cable 4 is attached to the outer surface of the protective positioning post 33, its rotation in the vertical plane is stabilized, achieving the effect of stabilizing the bottom of the integrated cable 4.

[0054] Embodiment III

[0055] This embodiment is an injection molding method for a TPE halogen-free flame-retardant cable injection molding device;

[0056] As Figure 1 shown, an injection molding method for a TPE halogen-free flame-retardant cable injection molding device includes the following injection molding steps:

[0057] Step S1: Injection molding feeding. The TPE halogen-free material is put into the inside of the feeding cylinder 11, melted by the hot melt sleeve 12, and the melted plastic is injected into the inside of the injection sleeve 21 through the extrusion component to complete the injection molding feeding;

[0058] Step S2: Injection molding pressing. The integrated cable 4 is moved into the inside of the cable conveying bracket 22 through the traction motor 23, and the outer surface of the protective positioning post 33 is squeezed according to the number of integrated cables 4 to be injection molded, so that the grooves on the outer surface of the protective positioning post 33 are in contact with the integrated cable 4. At the same time, the outer side of the integrated cable 4 is pressed by the cable arranging wheel 24 to form stripe grooves, completing the cable pressing operation before injection molding;

[0059] Step S3: Integrating injection molding. After the integrated cable 4 is attached to the outer surface of the protective positioning post 33, it is moved to the other side of the injection molding annular groove, and the protective layer material extruded through the injection molding sleeve 21 is used to coat the integrated cable of the protective layer.

[0060] Step S4: Cooling and shaping. Inside the temperature reduction shaping sleeve 5, the injection-molded protective layer is cooled through the temperature reduction nozzle so that it is tightly coated with the cable.

[0061] Step S5: Forming and winding. The transportation cable is wound on the outer surface of the winding post to complete the winding operation of the protective layer.

[0062] Through the above technical solution, in step S2, the number of fitting grooves on the outer surface of the protective positioning post 33 depends on the number of integrated cables 4, and the outer surface of the protective positioning post 33 is pressed by the pressing fit strip, so that sunken stripe grooves appear on the surface, and the integrated cable 4 can be attached to the outer surface of the protective positioning post 33 to avoid slipping.

[0063] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A TPE halogen-free flame-retardant cable injection molding device, comprising an injection molding machine (1) and an integrated cable (4), characterized in that, At the top of the injection molding machine (1), there is a feeding cylinder (11). At the bottom of the feeding cylinder (11), there is a hot melt sleeve (12). Inside the hot melt sleeve (12), there is an extrusion component. Inside the injection molding machine (1), there is a cable injection molding and pressing mechanism (2), and inside the injection molding machine (1), there is a cable injection molding positioning mechanism (3); The cable injection molding and pressing mechanism (2) includes an injection sleeve (21) arranged on the right side of the injection molding machine (1). On the back of the injection sleeve (21), there is a cable conveying support (22). On the front of the injection sleeve (21), there is a traction motor (23). The output shaft of the traction motor (23) is provided with a wire winding column. Inside the wall of the cable conveying support (22), there is a cable sorting wheel (24), and on the outer side of the cable sorting wheel (24), there is a pressing groove; The outer surface of the cable sorting wheel (24) is in contact with the outer surface of the integrated cable (4). The rotation position of the cable sorting wheel (24) is fixed, and multiple cable sorting wheels (24) are rotationally symmetrically distributed on the inner wall of the cable conveying support (22); The cable injection molding positioning mechanism (3) includes a positioning column conveying support (31) arranged inside the cable conveying support (22). The positioning column conveying support (31) is circular. On the inner wall of the positioning column conveying support (31), there is a cable mating wheel (32) that fits with the cable sorting wheel (24). On the inner wall of the positioning column conveying support (31), there is a protective positioning column (33) whose outer surface fits with the inner side of the integrated cable (4). And at the bottom of the injection sleeve (21), there is an injection annular groove.

2. The TPE halogen-free flame-retardant cable injection molding equipment according to claim 1, wherein, At the bottom of the injection molding machine (1), there is a cooling and shaping sleeve (5). At the bottom of the injection sleeve (21), there is a protective layer integrated cable. Inside the cooling and shaping sleeve (5), there is an extrusion fitting wheel (51) that fits with the protective layer integrated cable.

3. The TPE halogen-free flame-retardant cable injection molding equipment according to claim 1, characterized in that, On the inner wall of the positioning column conveying support (31), there is a rolling telescopic groove.

4. A TPE halogen-free flame-retardant cable injection molding device according to claim 3, wherein, Outside the rotation center of the cable mating wheel (32), there is a rolling shaft (321) that is slidably connected to the rolling telescopic groove. And on the outer surface of the rolling shaft (321), there is a compression spring (322) sleeved.

5. A TPE halogen-free flame-retardant cable injection molding device according to claim 1, characterized in that, On the outer side of the cable mating wheel (32), there is a pressing mating strip. And the cable mating wheel (32) is rotationally distributed on the inner wall of the positioning column conveying support (31). The inner side of the cable mating wheel (32) is in contact with the protective positioning column (33).

6. A method for injection molding proposed by a TPE halogen-free flame-retardant cable injection molding device according to any one of claims 1-5, characterized in that It includes the following injection molding steps: Step S1: Injection molding feeding. Put the TPE halogen-free material into the feeding cylinder (11). Melt the TPE halogen-free material through the hot melt sleeve (12), and inject the molten plastic into the injection sleeve (21) through the extrusion component to complete the injection molding feeding; Step S2: Injection molding pressing. Move the integrated cable (4) into the cable conveying bracket (22) through the traction motor (23), and extrude the outer surface of the protective positioning post (33) according to the number of integrated cables (4) to be injection molded, so that the grooves on the outer surface of the protective positioning post (33) fit with the integrated cable (4). At the same time, press the outer side of the integrated cable (4) through the cable arranging wheel (24) to make stripe grooves appear, completing the cable pressing operation before injection molding; Step S3: Integrated injection molding. After the integrated cable (4) fits on the outer surface of the protective positioning post (33), move to the other side of the injection molding annular groove, and coat the integrated cable of the protective layer with the protective layer material extruded by the injection sleeve (21); Step S4: Cooling and shaping. Cool the injection molded protective layer through the cooling nozzle inside the temperature reduction and shaping sleeve (5) to make it tightly coated with the cable; Step S5: Forming and winding. Wind the transport cable on the outer surface of the take-up post to complete the winding operation of the protective layer.

7. The injection molding method according to claim 6, characterized in that, In Step S2, the number of fitting grooves on the outer surface of the protective positioning post (33) depends on the number of integrated cables (4), and the outer surface of the protective positioning post (33) is pressed by a pressing fit strip, so that sunken stripe grooves appear on the surface, enabling the integrated cable (4) to be fitted to the outer surface of the protective positioning post (33).

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