A co-extruded extruded tape blank anti-twist device

Abstract

The utility model relates to a kind of co-extrusion extrusion tape blank anti-twist devices, and tape blank is extruded by extrusion die and is pulled by traction machine;Including: tape blank support plug head, setting in tape blank inner cavity;Friction press wheel, setting in tape blank outside, tape blank is compacted on tape blank support plug head by friction press wheel, and friction press wheel provides friction for tape blank;Press wheel adjusting mechanism, friction press wheel is connected on press wheel adjusting mechanism, and press wheel adjusting mechanism is used to adjust the pressure of friction press wheel to tape blank. Stable friction force between friction press wheel and tape blank is ensured using the clamping force of press wheel adjusting mechanism;Friction press wheel angle is kept consistent with tape blank grain by 360 ° adjustable pivot;Fine groove on tape blank support plug head further increases friction force.The utility model structure is reasonable, can effectively prevent tape blank from appearing twist, winding phenomenon in conveying process, ensure that tape blank enters die smoothly, improve production efficiency and product quality, especially suitable for long distance, high-precision co-extrusion production demand.

Description

Technical Field

[0001] This utility model belongs to the technical field of polymer material extrusion molding equipment. It is mainly applied to the strip conveying process in the co-extrusion production of plastics, rubber and composite materials. Specifically, it is a co-extrusion strip anti-torsion device to solve the problem that existing strips are prone to torsion, entanglement and knotting during long-distance conveying. Background Technology

[0002] In the co-extrusion production process of strip preforms, the strip preform (made of filament or staple fiber braiding) will experience rotational force due to its twisting structure or stress during long-distance transport, commonly known as "twisting." If left untreated, this can lead to knotting or even breakage of the strip preform, severely impacting production efficiency and product quality. Traditional anti-twist devices mainly rely on simple guide wheels or pressure rollers to mechanically constrain the movement trajectory of the strip preform. However, these devices have significant shortcomings in practical applications: firstly, the friction between ordinary pressure rollers and the strip preform is insufficient, making it difficult to effectively control the twisting tendency of the strip preform; secondly, fixed guide structures cannot adapt to the texture characteristics of strip preforms of different specifications, resulting in uneven stress on the strip preform and exacerbating the twisting phenomenon. Furthermore, traditional devices are prone to wear and jamming after prolonged operation, leading to high maintenance costs and failing to meet the demands of modern continuous production.

[0003] In existing technologies, increasing the number of guide rollers or increasing the clamping force are commonly used to solve the problem of strip torsion. However, these methods often only address the symptoms, not the root cause: too many guide rollers increase system resistance and affect the strip conveying speed; while excessive clamping force may cause strip deformation or surface damage. Especially in co-extrusion processes, since the strip is usually composed of multiple layers of different materials, the shrinkage rate and friction coefficient of each layer are different, making it easier to generate internal stress during conveying, which in turn leads to overall strip torsion. In addition, traditional single-axis cylinder-driven clamping mechanisms are prone to problems such as piston rod misalignment and seal wear after long-term use, affecting the stability of the clamping force and further reducing the anti-torsion effect.

[0004] With the development of co-extrusion technology, the requirements for strip conveying systems are becoming increasingly stringent. Modern production lines not only require anti-torsion devices to adapt to the production of strips of different materials and specifications, but also to possess stable operating performance and low maintenance requirements. Especially in the field of high-precision extrusion, such as the production of medical catheters and optical films, even slight twisting of the strip can lead to substandard performance of the final product. Therefore, there is an urgent need to develop a new type of anti-torsion device that, through optimized structural design, can prevent strip damage while ensuring sufficient friction, achieving a stable and reliable anti-torsion effect to meet the needs of modern continuous production. Utility Model Content

[0005] The purpose of this invention is to provide a co-extrusion strip anti-twist device to solve the problems of twisting, entanglement and knotting that easily occur in existing strips during long-distance transportation.

[0006] To solve the above problems, this utility model provides a co-extrusion strip anti-torsion device, wherein the strip is extruded from an extrusion die and pulled by a traction machine; comprising:

[0007] A blank support plug is disposed in the inner cavity of the blank;

[0008] The friction roller is located on the outside of the strip blank, and the strip blank is pressed against the strip blank support plug by the friction roller. The friction roller provides friction force to the strip blank.

[0009] The pressure roller adjustment mechanism is connected to the friction pressure roller, and the pressure roller adjustment mechanism is used to adjust the pressure of the friction pressure roller on the strip blank.

[0010] Furthermore, it also includes a rotating shaft, through which the pressure roller adjustment mechanism is connected to the friction pressure roller.

[0011] Furthermore, the surface of the blank support plug is provided with fine grooves.

[0012] Furthermore, the pressure roller adjustment mechanism is an electric telescopic rod or a cylinder.

[0013] Furthermore, the outer layer of the friction roller is made of rubber, while the inner layer is a rigid support structure.

[0014] Furthermore, the working surface of the friction roller is matched with the texture of the strip blank.

[0015] Furthermore, the pressure roller adjustment mechanism is fixedly connected to the support of the device.

[0016] Furthermore, the adjustment direction of the pressure roller adjustment mechanism is perpendicular to the movement direction of the strip blank.

[0017] Furthermore, the rotation direction of the friction roller is the same as the movement direction of the strip blank.

[0018] Furthermore, four sets of pressure roller adjustment mechanisms and friction pressure rollers are set up to form a four-wheel anti-spin mechanism.

[0019] This utility model has the following beneficial effects:

[0020] (1) The anti-torsion structure design of this utility model effectively solves the technical problem of long-distance conveying of co-extrusion blanks. The friction roller generates a uniformly distributed frictional force through close contact with the blank, enabling the roller to stably hold the blank and ensure its orderly movement along the predetermined texture. This structural design cleverly utilizes the texture characteristics of the blank itself, ensuring the blank maintains a neat orientation during conveying and avoiding the tangling and knotting phenomena common in traditional processes. Especially for blanks of different materials and specifications, this device provides a stable holding effect, significantly improving the reliability and continuity of long-distance co-extrusion production, and providing a strong guarantee for the production of high-quality extruded products.

[0021] (2) The friction transmission system of this utility model achieves precise control of strip conveying. The friction roller adopts a composite structure, combining an outer rubber material with an inner rigid support. Under the stable clamping force of the roller adjustment mechanism, it forms optimal frictional contact with the strip. The 360° adjustable shaft allows the roller to precisely match strips with different texture characteristics, ensuring uniform transmission of frictional force. The fine groove structure on the surface of the strip support plug further enhances the friction effect, forming a synergistic effect with the friction roller, and constructing a stable frictional guiding system on the strip conveying path. The dual friction protection mechanism effectively suppresses the torsional tendency of the strip, fundamentally solving the "twisted" deformation problem, and ensuring that the strip always maintains an ideal motion state.

[0022] (3) This utility model utilizes the clamping force of the pressure roller adjustment mechanism. The advantage of using a dual-axis cylinder in the pressure roller adjustment mechanism is that it is not easy to jam or be damaged under harsh stress conditions. The movement trajectory is flat, the rigidity is good, and the load shaking is small, which will not cause the strip to shake during movement and maintain the uniformity of the product during extrusion. A rotating shaft is installed between the pressure roller adjustment mechanism and the friction pressure roller. The rotating shaft is used to adjust the angle of the friction pressure roller to keep it consistent with the strip texture during movement. The clamping force of the pressure roller adjustment mechanism generates friction between the friction pressure roller and the strip. This friction is used to directly transmit motion and torque to prevent the strip from shifting and avoid the strip from becoming "twisted". Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view of the anti-torsion device for co-extrusion strip blank according to an embodiment of the present invention;

[0025] Figure 2This is an isometric view of the anti-torsion device for co-extrusion strip blank according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram showing the contact between the friction roller, the strip support plug, and the strip in an embodiment of this utility model.

[0027] Figure 4 This is a front view of the four-wheel anti-spin mechanism according to an embodiment of the present invention;

[0028] Figure 5 This is an isometric view of the four-wheel anti-spin mechanism according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached drawings: 1-Friction roller; 2-Rotating shaft; 3-Roller adjustment mechanism; 4-Extrusion die; 5-Pressure strip; 6-Pressure strip support plug; 7-Finished product. Detailed Implementation

[0030] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0031] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0032] like Figures 1 to 5 As shown, the co-extrusion strip anti-torsion device of this utility model mainly includes a friction roller 1, a roller adjustment mechanism 3, an extrusion die 4, and a strip support plug 6. The strip support plug 6 is disposed in the inner cavity of the strip 5, and the friction roller 1 is disposed on the outer side of the strip 5. The strip 5 is pressed against the strip support plug 6 by the friction roller 1, which provides friction to the strip 5. The friction roller 1 is connected to the roller adjustment mechanism 3, which is used to adjust the pressure of the friction roller 1 on the strip.

[0033] In one embodiment, the outer layer of the friction roller 1 is made of rubber, and the inner layer is a rigid support structure, ensuring that the friction roller 1 can provide sufficient friction when pressure is applied, without deforming due to insufficient rigidity.

[0034] In one embodiment, the working surface of the friction roller 1 is provided with anti-slip texture to further enhance the friction with the strip 5 and ensure that the strip 5 will not affect the stability of movement due to slippage during the conveying process.

[0035] In one embodiment, the working surface of the friction roller 1 is matched with the texture of the strip 5 to increase the contact area and improve the efficiency of friction transmission.

[0036] In one embodiment, the rotation direction of the friction roller 1 is the same as the movement direction of the strip 5, ensuring that the strip 5 is not hindered by reverse friction during the conveying process.

[0037] In one embodiment, the pressure roller adjustment mechanism 3 is connected to the friction pressure roller 1 via a rotating shaft 2. The rotating shaft 2 can be rotated 360° to adjust the friction pressure roller 1 precisely according to the texture angle of the strip 5, ensuring that the contact surface between the pressure roller and the strip 5 always maintains the best fit.

[0038] In one embodiment, the two rotating shafts 2 are respectively connected to rotating shaft mounting seats, one of which is connected to the friction pressure roller 1, and the other is connected to the pressure roller adjustment mechanism 3. The two rotating shafts 2 are connected by a connecting rod.

[0039] In one embodiment, a damping structure is provided on the rotating shaft 2. This damping structure employs a friction plate damping design, including friction plates fixed to the rotating shaft 2 and a damping ring mounted on the rotating shaft mounting base. The damping structure ensures that the friction roller 1 maintains a stable angle during operation and does not undergo unexpected rotation due to vibration or external forces.

[0040] In one embodiment, the co-extrusion strip anti-torsion device bracket is provided with a mounting plate for fixing the pressure roller adjustment mechanism 3. The mounting plate is fixed on the bracket, providing a stable working foundation for the pressure roller adjustment mechanism 3 and facilitating the stable installation of the pressure roller adjustment mechanism 3.

[0041] In one embodiment, the pressure roller adjustment mechanism 3 is an electric telescopic rod or a cylinder, preferably a dual-axis cylinder. The advantages of a dual-axis cylinder are that it is not easy to jam or be damaged under harsh stress conditions, its movement trajectory is flat and rigid, its load sway is small, and it will not cause swaying when the blank moves, thus maintaining the uniformity of the product during extrusion.

[0042] In one embodiment, the piston rod of the pressure roller adjusting mechanism 3 moves in a direction perpendicular to the movement direction of the strip 5, ensuring that the clamping force acts directly on the surface of the strip and preventing the strip from shifting or twisting during the conveying process.

[0043] In one embodiment, the surface of the strip support plug 6 is provided with fine grooves to increase the friction with the strip 5.

[0044] In one embodiment, the strip support plug 6 is fixed to a connecting rod, which is fixedly connected to one end of the extrusion die 4. The connecting rod provides a stable mounting reference for the strip support plug 6, ensuring that the strip support plug 6 maintains a precise relative position with the friction roller 1. Through the rigid support of the connecting rod, the strip support plug 6 can guide the strip 5 along a predetermined path into the extrusion die 4, preventing the strip from shifting during transport.

[0045] In operation, the co-extrusion strip anti-torsion device of this invention allows the strip 5 to move slowly under the action of the traction machine. Before the strip enters the extrusion die 4, the friction roller 1 is powered by the roller adjustment mechanism 3. Since the texture (warp and weft density) of strips of different specifications is different, the friction roller 1 is adjusted through the rotating shaft 2 to make the angle of the friction roller 1 consistent with the texture of the strip 5. This ensures that the texture of the friction roller 1 and the extruded strip 5 are consistent and also increases the force-bearing area of ​​the friction roller 1. The strip 5 is pressed tightly onto the strip support plug 6 by the friction roller 1. The fine grooves on the strip support plug 6 increase the friction force. Under the clamping force of the strip support plug 6 and the friction roller 1, the strip 5 smoothly enters the extrusion die 4 to form the finished product 7.

[0046] In one embodiment, four sets of pressure roller adjusting mechanism 3 and friction pressure rollers 1 are respectively arranged to form a four-wheel anti-rotation mechanism. The four sets of friction pressure rollers 1 are evenly arranged along the strip 5 to form a stable force field distribution, effectively suppressing the twisting tendency of the strip in all directions, ensuring that the strip is subjected to uniform clamping force and friction during conveying, and effectively preventing the strip from twisting like a "twisted rope". The four-wheel anti-rotation mechanism improves the stability and adaptability of the device and is suitable for the production of extruded strips of different specifications.

[0047] Each set of friction rollers 1 can independently adjust pressure and angle, and the four-wheel anti-spin mechanism enables the device to adapt to more complex working conditions. The four-wheel anti-spin mechanism also has redundancy; when one roller needs maintenance, the remaining rollers can still maintain basic functions, ensuring production continuity.

[0048] This invention relates to a co-extrusion strip anti-torsion device. Through the coordinated action of the friction roller 1, roller adjustment mechanism 3, strip support plug 6, and extrusion die 4, it achieves stable conveying and anti-torsion functions for the strip 5. The friction roller 1, clamped by the roller adjustment mechanism 3, provides stable frictional force. The strip support plug 6 further guides the strip into the extrusion die 4, while the four-wheel anti-torsion mechanism ensures the stability of the strip during long-distance conveying. The entire device is compact, flexible in adjustment, and suitable for producing strips of different specifications, effectively improving production efficiency and product quality.

[0049] This invention relates to an anti-torsion device for co-extrusion strips, which can be widely used in plastic extrusion, rubber extrusion, and composite material co-extrusion, and is especially suitable for long-distance, high-precision extrusion production. By optimizing friction and guiding structure, this device solves the problems of traditional strip torsion and entanglement, improving the stability of the production line and the consistency of the products. Furthermore, the modular design of the device facilitates maintenance and adjustment, making it highly practical and economical.

[0050] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, nor is it limited to the co-extrusion strip anti-torsion device. Equipment and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A co-extrusion strip anti-torsion device, wherein the strip (5) is extruded from an extrusion die (4) and pulled by a traction machine; characterized in that, include: A blank support plug (6) is provided in the inner cavity of the blank (5); Friction roller (1) is arranged on the outside of the strip blank (5). The strip blank (5) is pressed by the friction roller (1) onto the strip blank support plug (6). The friction roller (1) provides friction force to the strip blank (5). Pressure roller adjustment mechanism (3), wherein the friction pressure roller (1) is connected to the pressure roller adjustment mechanism (3), and the pressure roller adjustment mechanism (3) is used to adjust the pressure of the friction pressure roller (1) on the strip blank.

2. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: It also includes a rotating shaft (2), and the pressure roller adjustment mechanism (3) is connected to the friction pressure roller (1) through the rotating shaft (2).

3. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The surface of the blank support plug (6) is provided with fine grooves.

4. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The pressure roller adjustment mechanism (3) is an electric telescopic rod or a cylinder.

5. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The outer layer of the friction roller (1) is made of rubber, and the inner layer is a rigid support structure.

6. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The working surface of the friction roller (1) matches the texture of the strip (5).

7. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The pressure roller adjustment mechanism (3) is fixedly connected to the support of the device.

8. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: According to claim 1, the anti-torsion device for co-extrusion strip is characterized in that: the adjustment direction of the pressure roller adjustment mechanism (3) is perpendicular to the movement direction of the strip (5).

9. The anti-torsion device for co-extrusion strip according to claim 1, characterized in that: The rotation direction of the friction roller (1) is the same as the movement direction of the strip blank (5).

10. The anti-torsion device for co-extrusion strip according to claim 1 or 2, characterized in that: The pressure roller adjustment mechanism (3) and friction pressure roller (1) are set in four sets to form a four-wheel anti-spin mechanism.

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