Multi-layer lining spring device for forming nylon tube
By using a multi-layer spring-supporting device in the nylon tube molding process, combining inner and outer spring-supporting designs, the spring imprint problem was solved, the molding quality of the nylon tube was improved, and the service life of the spring-supporting devices was extended.
Patent Information
- Application Number
- CN202423302928.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing technologies, the spring marks of the inner lining spring are obvious after nylon tube molding, which affects the molding quality, especially in automated molding processes.
A multi-layer spring device is adopted, including an inner spring and an outer spring. The inner spring has a multi-stage spiral first annular edge, and the outer spring has a multi-stage spiral second annular edge. The inner spring and the outer spring are tightened by a tension rope to avoid increasing the gap between adjacent annular edges and reduce spring marks.
It improves the molding quality of nylon tubing, extends the service life of inner and outer lining springs, avoids spring marks, and enhances the molding effect.
Smart Images
Figure CN223701792U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of nylon tube forming technology, and more specifically, it relates to a multi-layer spring device for nylon tube forming. Background Technology
[0002] When processing nylon tubing, if the outer diameter of the nylon tubing is 6mm or more, an inner liner spring for support is usually inserted inside. This inner liner spring is made of tightly wound springs. Specifically, the inner liner spring is inserted into the nylon tubing at room temperature to provide support and prevent the nylon tubing from folding or denting during the molding process. Subsequently, the mold, nylon tubing, and inner liner spring are heated, kept at a constant temperature, and then cooled to set the shape. Finally, the inner liner spring is removed, completing the molding process of the nylon tubing.
[0003] In the prior art, after the inner lining spring is bent, the two-stage spiral layers that are sequentially connected along the axial direction at the bend will change from a dense state with gaps to a loose state. Therefore, there will be spring marks inside the nylon tube that is formed. Especially after the automatic forming process is adopted, the operation of heating the nylon tube before bending makes the spring marks more obvious, which further affects the forming quality of the nylon tube. Utility Model Content
[0004] The purpose of this invention is to provide a multi-layer spring device for nylon tube forming, which aims to solve the technical problem that obvious spring marks inside the tube after nylon tube forming using existing technology affect the forming quality.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a multi-layer spring retainer device for nylon tube forming, comprising:
[0006] The drive mechanism has a connecting rod, the end of which is connected to a tension rope;
[0007] The inner liner spring has multiple helical first annular edges, which are spaced apart along the axial direction of the connecting rod; one end of the inner liner spring is fixed to the end of the connecting rod.
[0008] An outer spring is sleeved outside the inner spring, and the inner peripheral wall of the outer spring abuts against the outer peripheral wall of the inner spring; the outer spring has multiple helical second annular edges; the outer spring is used for support inside the nylon tube; in the axial direction of the connecting rod, the inner spring and the outer spring are staggered front and rear, and a set of first annular edges is provided between two adjacent stages of the second annular edges;
[0009] The tensioning rope passes through the inner liner spring and is fixed at the other end of the inner liner spring, and is connected to the outer liner spring to compress the inner liner spring and the outer liner spring.
[0010] In one possible implementation, there are multiple inner liner springs, which are arranged radially around the tension rope along the outer liner spring; each inner liner spring has multiple levels of first annular edges arranged in a spiral shape; wherein, in the axial direction of the connecting rod, a set of first annular edges of the inner liner springs are arranged between two adjacent levels of the first annular edges of the outer inner liner springs.
[0011] In one possible implementation, the end of the inner liner spring away from the connecting rod is provided with a limiting member, one end of which extends into the inner liner spring and the other end is limited outside the inner liner spring and the outer liner spring; the insertion end of the tension rope is connected to the limiting member, and the tension rope presses the inner liner spring and the outer liner spring through the limiting member.
[0012] In some embodiments, the limiting member includes:
[0013] The limiting plug has one end placed inside the inner liner spring and the other end limited to the end of the inner liner spring and the outer liner spring away from the connecting rod;
[0014] A rope locking device is positioned on the side of the limiting plug away from the inner liner spring;
[0015] The tensioning rope passes through the limiting plug and is fixed to the rope locking device.
[0016] For example, the limiting plug includes:
[0017] The first insertion portion has a radial dimension smaller than that of the inner liner spring and extends into the inner liner spring;
[0018] The first limiting part, with a radial dimension not less than the radial dimension of the outer liner spring, is positioned outside the inner liner spring;
[0019] A first limiting surface is formed at the junction of the first limiting portion and the first extending portion, which abuts against the end of the outer retaining spring.
[0020] In some embodiments, the first insertion portion is provided with a clearance hole suitable for the tension rope to pass through; the first limiting portion is provided with a limiting hole adapted to the outer peripheral surface of the rope locking device, the limiting hole and the clearance hole both extend along the axial direction of the inner liner spring and are interconnected.
[0021] In one possible implementation, the end of the connecting rod is provided with a connector, one end of which extends into the inner liner spring and the other end is limited outside the inner liner spring and the outer liner spring; the tension rope is fixed to the connector.
[0022] In some embodiments, the connector includes:
[0023] The second extension has a radial dimension smaller than that of the inner liner spring and extends into the inner liner spring;
[0024] The second limiting part, with a radial dimension not less than that of the outer liner spring, is positioned outside the inner liner spring;
[0025] A second limiting surface is formed at the junction of the second limiting portion and the second extending portion, which abuts against the end of the outer retaining spring.
[0026] Compared with the prior art, the solution shown in this application embodiment, by setting an inner and outer liner spring that are nested together, allows the increased gap between adjacent second annular edges to be supported by the first annular edge when the nylon tube is bent. Therefore, it can prevent the nylon tube from concave inward and forming a spring mark, thus improving the forming quality of the nylon tube. In addition, by tightening the ends of the inner and outer liner springs with a tension rope, the gap between adjacent second annular edges can be reduced, reducing the spring mark. At the same time, it can avoid repeated pulling of the inner and outer liner springs, extending their service life. Attached Figure Description
[0027] 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.
[0028] Figure 1 A schematic diagram of the structure of the multi-layer spring retainer device for nylon tube forming provided in this embodiment of the utility model;
[0029] Figure 2 This is a partial cross-sectional structural diagram of the multi-layer spring retainer device for nylon tube forming provided in an embodiment of the present invention.
[0030] In the diagram: 1. Drive mechanism; 11. Connecting rod; 12. Tensioning rope; 2. Inner liner spring; 21. First annular edge; 3. Outer liner spring; 31. Second annular edge; 4. Limiting component; 41. Limiting plug; 411. First limiting part; 4111. Limiting hole; 412. First extension part; 4121. Clearance hole; 413. First limiting surface; 42. Rope locking device; 5. Connector; 51. Second extension part; 52. Second limiting part; 53. Second limiting surface; 6. Nylon tube. Detailed Implementation
[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.
[0034] Please refer to the following: Figure 1 and Figure 2 The multi-layer spring device for nylon tube forming provided by this utility model will now be described. The multi-layer spring device for nylon tube forming includes a drive mechanism 1, an inner spring 2, and an outer spring 3. The drive mechanism 1 has a connecting rod 11, the end of which is connected to a tension rope 12. The inner spring 2 has multiple spirally arranged first annular edges 21, which are spaced apart along the axial direction of the connecting rod 11. One end of the inner spring 2 is fixed to the end of the connecting rod 11. The outer spring 3 is sleeved outside the inner spring 2, and the inner circumferential wall of the outer spring 3... The outer spring 3 abuts against the outer peripheral wall of the spring; the outer spring 3 has multiple spirally arranged second annular edges 31; the outer spring 3 is used to support the nylon tube 6; in the axial direction of the connecting rod 11, the inner spring 2 and the outer spring 3 are staggered front and rear, and a set of first annular edges 21 is provided between two adjacent second annular edges 31; wherein, the tensioning rope 12 passes through the inner spring 2 and is fixed to the other end of the inner spring 2, and is connected to the outer spring 3 to press the inner spring 2 and the outer spring 3 together.
[0035] It should be understood that the connecting rod 11 is used to drive the inner liner spring 2 and the outer liner spring 3 into the nylon tube 6; the drive mechanism 1 adopts a magnetic constraint mechanism, which drives the connecting rod 11 to extend or remove the inner liner spring 2 and the outer liner spring 3 into or out of the nylon tube 6. Specifically, the structure and working principle of this magnetic constraint mechanism are existing technologies and will not be described in detail here.
[0036] To facilitate the insertion of the inner spring 2 and the outer spring 3 into the nylon tube 6, the radial dimension of the outer spring 3 is equal to or slightly smaller than the inner wall dimension of the nylon tube 6; in addition, to ensure strong support for the outer spring 3, the radial dimension of the outer spring 3 cannot be too small.
[0037] Optionally, the tensioning rope 12 has a certain strength to prevent breakage during tensioning. The tensioning rope 12 tightens the ends of the inner spring 2 and the outer spring 3, pressing the inner spring 2 and the outer spring 3 against the connecting rod 11 to prevent the gap between adjacent second annular edges 31 from increasing and producing spring marks when the inner spring 2 or the outer spring 3 is in a relaxed state.
[0038] The multi-layer spring support device for nylon tube forming provided by this utility model, compared with the prior art, by setting up an inner spring 2 and an outer spring 3 that are nested together, allows the increased gap between two adjacent second annular edges 31 to be supported by the first annular edge 21 when the nylon tube 6 is bent. Therefore, it can prevent the nylon tube 6 from concave inward and forming a spring mark, thus improving the forming quality of the nylon tube 6. In addition, by tightening the ends of the inner spring 2 and the outer spring 3 by the tension rope 12, the gap between two adjacent second annular edges 31 can be reduced, reducing the spring mark. At the same time, it can avoid repeated pulling of the inner spring 2 and the outer spring 3, extending the service life of the inner spring 2 and the outer spring 3.
[0039] Please see Figure 1 In some possible embodiments, multiple inner liner springs 2 are provided, and multiple inner liner springs 2 are arranged radially and spaced outside the tension rope 12; each inner liner spring 2 has multiple levels of first annular edges 21 arranged in a spiral shape; wherein, in the axial direction of the connecting rod 11, a set of first annular edges 21 of the inner liner spring 2 placed in the inner layer is provided between two adjacent levels of first annular edges 21 of the inner liner spring 2 placed in the outer layer.
[0040] By setting multiple inner lining springs 2, when the nylon tube 6 is bent and a gap is formed between the second annular edges 31 of the outer lining spring 3, the inner lining springs 2 can provide support, avoid spring marks, and ensure molding quality.
[0041] Optionally, there are two inner liner springs 2. The innermost inner liner spring 2 is the third liner spring. The third liner spring has multiple levels of third annular edges arranged in a spiral shape. In the axial direction of the connecting rod 11, a set of third annular edges is provided between two adjacent levels of first annular edges 21.
[0042] Specifically, the number of inner liner springs 2 can be selected according to actual needs.
[0043] Please see Figure 1 In some possible embodiments, the end of the inner spring 2 away from the connecting rod 11 is provided with a limiting member 4, and one end of the limiting member 4 extends into the inner spring 2, while the other end is limited outside the inner spring 2 and the outer spring 3; the insertion end of the tension rope 12 is connected to the limiting member 4, and the tension rope 12 presses the inner spring 2 and the outer spring 3 through the limiting member 4.
[0044] By setting a limiting member 4, the inner spring 2 and the outer spring 3 are limited to the ends away from the connecting rod 11, so that the limiting member 4 and the connecting rod 11 press the inner spring 2 and the outer spring 3 tightly, and prevent the inner spring 2 and the outer spring 3 from generating spring marks in the relaxed state.
[0045] Please see Figure 1 In some embodiments, the limiting member 4 includes a limiting plug 41 and a rope locking device 42; one end of the limiting plug 41 is placed inside the inner liner spring 2, and the other end is limited at the end of the inner liner spring 2 and the outer liner spring 3 away from the connecting rod 11; the rope locking device 42 is placed on the side of the limiting plug 41 away from the inner liner spring 2; wherein, the tension rope 12 passes through the limiting plug 41 and is fixed on the rope locking device 42.
[0046] Specifically, the rope locking device 42 is used to fix the end of the tension rope 12, and the limiting plug 41 is used to limit the rope locking device 42 to prevent the rope locking device 42 from entering the inner spring and losing its effectiveness, while assisting the rope locking device 42 to press against the ends of the inner spring 2 and the outer spring 3.
[0047] It should be understood that the radial dimensions of the limiting plug 41 and the rope locking device 42 are not greater than the internal dimensions of the nylon tube 6, so as to ensure that the limiting plug 41 and the rope locking device 42 extend into the nylon tube 6 along with the inner liner spring 2 and the outer liner spring 3, and pass out of the nylon tube 6.
[0048] Please see Figure 2 For example, the limiting plug 41 includes a first extending portion 412 and a first limiting portion 411; the radial dimension of the first extending portion 412 is smaller than the radial dimension of the inner liner spring 2 and extends into the inner liner spring 2; the radial dimension of the first limiting portion 411 is not smaller than the radial dimension of the outer liner spring 3 and is located outside the inner liner spring 2; wherein, a first limiting surface 413 abutting against the end of the outer liner spring 3 is formed at the junction of the first limiting portion 411 and the first extending portion 412.
[0049] The first insert 412 is used to extend into the inner spring 2 to guide and support the end of the inner spring 2, so as to prevent the inner spring 2 from shifting during the pressing process and affecting the stability of the internal support; the first limiting part 411 is used to form a first limiting surface 413 with the first insert 412, thereby pressing against the end faces of the outer spring 3 and the inner spring 2.
[0050] Specifically, the first limiting surface 413 is annular and presses against the end faces of the inner liner spring 2 and the outer liner spring 3.
[0051] Please see Figure 2 In some embodiments, the first insertion part 412 is provided with a relief hole 4121 suitable for the tension rope 12 to pass through; the first limiting part 411 is provided with a limiting hole 4111 that matches the outer peripheral surface of the rope locker 42. The limiting hole 4111 and the relief hole 4121 both extend along the axial direction of the inner liner spring 2 and are interconnected.
[0052] By setting a clearance hole 4121, the tensioning rope 12 can pass through the limit plug 41; by setting a limit hole 4111, the rope locking device 42 is limited within the corresponding limit hole 4111, so as to prevent the rope locking device 42 from shifting and affecting the support of the inner spring 2 and the outer spring 3.
[0053] Optionally, the rope locking device 42 has a spherical structure, and the limiting hole 4111 is a spherical shape that is adapted to the rope locking device 42.
[0054] Please see Figure 1 In some possible embodiments, the end of the connecting rod 11 is provided with a connector 5, one end of which extends into the inner liner 2, and the other end is limited outside the inner liner 2 and the outer liner 3; the tension rope 12 is fixed on the connector 5.
[0055] By setting the connector 5, it is convenient to fix the end of the tension rope 12; and the inner spring 2 and the outer spring 3 can be limited at the end of the connecting rod 11, so that the inner spring 2 and the outer spring 3 are pressed between the connector 5 and the limiting member 4, so as to avoid the gap between adjacent second annular edges 31 increasing when the nylon tube 6 is bent.
[0056] Please see Figure 1 In some embodiments, the connector 5 includes a second insertion portion 51 and a second limiting portion 52; the radial dimension of the second insertion portion 51 is smaller than the radial dimension of the inner liner spring 2 and extends into the inner liner spring 2; the radial dimension of the second limiting portion 52 is not smaller than the radial dimension of the outer liner spring 3 and is located outside the inner liner spring 2; wherein, a second limiting surface 53 abutting against the end of the outer liner spring 3 is formed at the junction of the second limiting portion 52 and the second insertion portion 51.
[0057] The second extension portion 51 is used to extend into the inner liner spring 2 to guide and support the end of the inner liner spring 2, so as to prevent the inner liner spring 2 from shifting during the pressing process and affecting the stability of the internal support; the second limiting portion 52 is used to form a second limiting surface 53 with the second extension portion 51, thereby pressing against the end faces of the outer liner spring 3 and the inner liner spring 2.
[0058] Optionally, the second limiting surface 53 is annular and presses against the end faces of the inner liner spring 2 and the outer liner spring 3.
[0059] The inner spring 2 and the outer spring 3 form a double-layer spring structure. In actual use, when the nylon tube 6 needs to be molded, the magnetic constraint mechanism drives the connecting rod 11 to drive the double-layer spring structure into the nylon tube 6, and the end limiting piece 4 is pushed out of the end of the nylon tube 6. After the molding is completed, the driving mechanism 1 pulls out the double-layer spring structure so as to cut the molded nylon tube 6 and carry out the next stage of molding.
[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A multi-layer spring retainer device for nylon tube forming, characterized in that, include: The drive mechanism (1) has a connecting rod (11) with a tension rope (12) connected to the end of the connecting rod (11); The inner liner spring (2) is connected at one end to the end of the connecting rod (11); the inner liner spring (2) has multiple spirally arranged first annular edges (21), and the multiple first annular edges (21) are spaced apart along the axial direction of the connecting rod (11); An outer spring (3) is sleeved outside the inner spring (2), and the inner peripheral wall of the outer spring (3) abuts against the outer peripheral wall of the spring; the outer spring (3) has multiple spirally arranged second annular edges (31); the outer spring (3) is used to support the nylon tube (6); in the axial direction of the connecting rod (11), the inner spring (2) and the outer spring (3) are staggered front and back, and a set of first annular edges (21) is provided between two adjacent second annular edges (31); The tensioning rope (12) passes through the inner liner spring (2) and is fixed at the other end of the inner liner spring (2), and is connected to the outer liner spring (3) to press the inner liner spring (2) and the outer liner spring (3).
2. The multi-layer spring retainer device for nylon tube forming as described in claim 1, characterized in that, The inner liner spring (2) is provided in multiple stages, and the multiple inner liner springs (2) are sleeved on the tension rope (12) at radial intervals along the outer liner spring (3); each inner liner spring (2) has multiple stages of first annular edges (21) arranged in a spiral shape; wherein, in the axial direction of the connecting rod (11), a set of first annular edges (21) of the inner liner spring (2) is provided between two adjacent stages of the first annular edges (21) of the outer inner liner spring (2).
3. The multi-layer spring retainer device for nylon tube forming as described in claim 1, characterized in that, The inner liner spring (2) is provided with a limiting member (4) at one end away from the connecting rod (11), and one end of the limiting member (4) extends into the inner liner spring (2), while the other end is limited outside the inner liner spring (2) and the outer liner spring (3); the insertion end of the tension rope (12) is connected to the limiting member (4), and the tension rope (12) presses the inner liner spring (2) and the outer liner spring (3) through the limiting member (4).
4. The multi-layer spring retainer device for nylon tube forming as described in claim 3, characterized in that, The limiting member (4) includes: The limiting plug (41) has one end placed inside the inner liner spring (2) and the other end limited to the end of the inner liner spring (2) and the outer liner spring (3) away from the connecting rod (11); The rope locking device (42) is positioned on the side of the limiting plug (41) away from the inner liner spring (2); The tension rope (12) passes through the limiting plug (41) and is fixed on the rope lock (42).
5. The multi-layer spring retainer device for nylon tube forming as described in claim 4, characterized in that, The limiting plug (41) includes: The first extension (412) has a radial dimension smaller than that of the inner liner spring (2) and extends into the inner liner spring (2); The first limiting part (411) has a radial dimension not less than the radial dimension of the outer liner spring (3) and is placed outside the inner liner spring (2); A first limiting surface (413) is formed at the junction of the first limiting part (411) and the first extending part (412) to abut against the end of the outer liner (3).
6. The multi-layer spring retainer device for nylon tube forming as described in claim 5, characterized in that, The first insertion part (412) is provided with a relief hole (4121) suitable for the tension rope (12) to pass through; the first limiting part (411) is provided with a limiting hole (4111) that matches the outer peripheral surface of the rope lock (42). The limiting hole (4111) and the relief hole (4121) both extend along the axial direction of the inner liner spring (2) and are interconnected.
7. The multi-layer spring retainer device for nylon tube forming as described in claim 1, characterized in that, The end of the connecting rod (11) is provided with a connector (5), one end of the connector (5) extends into the inner liner spring (2), and the other end is limited to the inner liner spring (2) and the outer liner spring (3); the tension rope (12) is fixed on the connector (5).
8. The multi-layer spring retainer device for nylon tube forming as described in claim 7, characterized in that, The connector (5) includes: The second extension (51) has a radial dimension smaller than that of the inner liner spring (2) and extends into the inner liner spring (2); The second limiting part (52) has a radial dimension not less than the radial dimension of the outer liner spring (3) and is placed outside the inner liner spring (2); A second limiting surface (53) is formed at the junction of the second limiting part (52) and the second extending part (51) to abut against the end of the outer liner (3).