A tufting tension device for a fill-free artificial turf

Abstract

The utility model discloses a kind of filling-free tufting tension devices for artificial turf, belong to artificial turf production technical field.The device includes fixed rod, three tension rods and spring rod, fixed rod is sequentially connected three tension rods, wherein middle tension rod is connected with fixed rod via spring rod.Spring rod is made of main shaft, nut and two side springs, middle tension rod is arranged in main shaft through groove and is slidably matched with main shaft, the threaded section of main shaft one end is threadedly cooperated with nut, the pre-tightening amount of two side springs is adjusted by the position change of nut, to realize the fine adjustment of artificial grass silk running tension.Three tension rods are zigzag curved, artificial grass silk is formed broken line path by striding around, and the wrap angle and friction are increased to stabilize tension.In tufting process, middle tension rod realizes automatic compensation and self-reset under the action of two-way spring, buffer tension fluctuation, avoid grass silk slack, winding or breakage.

Description

Technical Field

[0001] This utility model belongs to the field of artificial turf production technology, specifically relating to a tufting tension device for infill-free artificial turf. Background Technology

[0002] In existing artificial turf tufting processes, the grass fibers need to maintain stable tension before entering the tufting needles to ensure uniform distribution and strong bonding with the base fabric during weaving. Common tension control methods include using fixed guide rods, friction wheels, or one-way spring mechanisms to adjust the grass fiber's movement. However, in the production of infill-free artificial turf, due to the finer fibers, higher density, and even greater requirements for uniform fiber arrangement, traditional tensioning devices have the following shortcomings: First, the tension generated by the fixed guide rod or friction wheel is not adjustable, making it difficult to flexibly adjust the tension according to actual needs when the weight or specifications of the grass fibers change. This can easily lead to uneven stress on the grass fibers, resulting in an uneven lawn surface.

[0003] Secondly, the existing one-way spring tension mechanism can only compensate for the tension fluctuation of the grass fibers on one side. When the grass fibers become loose, the compensation is not timely, and when the tension rises suddenly, the buffer is insufficient, which can easily lead to the grass fibers slipping, breaking or tangling, seriously affecting the quality of tufting and production stability.

[0004] Secondly, during the operation of the tufting machine, the upstream fiber supply speed often fluctuates, and the tension of the grass fibers may momentarily increase or decrease. Without an effective two-way adaptive compensation mechanism, the tension deviation is easily amplified, leading to problems such as skipped stitches and missing stitches at the tufting needle entry point, affecting the overall flatness and performance of the infill-free artificial turf. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a tufting tension device for artificial turf that does not require filling. This device can achieve finely adjustable tension and has bidirectional compensation capabilities, so as to adapt to the production needs of grass fibers of different specifications and ensure stable tension.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A tufting tension device for infill-free artificial turf includes a fixed rod, three tension rods, and a spring rod; the fixed rod is connected to the three tension rods in sequence, and the tension rod in the middle is connected to the fixed rod via the spring rod; The spring rod includes a main shaft, a nut, and a spring. The tension rod passes through the middle of the main shaft and slides with it. The springs are respectively sleeved on both sides of the tension rod in the middle on the main shaft. One end of the main shaft is provided with a threaded section and is threaded with the nut, so as to adjust the force on the middle tension rod relative to the fixed rod by the axial movement of the nut, thereby adjusting the running tension of the artificial grass fibers.

[0007] Furthermore, the three tension bars are serrated to form recesses for embedding the artificial grass fibers, thereby improving the positioning and anti-slip effect of the artificial grass fibers.

[0008] Furthermore, when in use, the artificial grass fibers sequentially wrap around the three tension bars to form a zigzag path, thereby increasing the wrap angle and friction to stabilize the tension while ensuring smooth threading.

[0009] Furthermore, the main shaft and the middle tension rod are axially slidingly fitted, and the springs on both sides provide elastic forces in opposite directions to the middle tension rod to achieve tension self-resetting in the middle position.

[0010] Furthermore, the nut rotates forward or backward along the threaded section of the main shaft to change the preload of the springs on both sides, thereby achieving fine adjustment of the tension.

[0011] Furthermore, the connection positions of the fixed rod and the three hand tension rods are staggered along the axial direction of the fixed rod to facilitate threading and guidance.

[0012] According to any one of the claims, the tufting tension device is characterized in that, during the tufting production process of infill-free artificial turf, the device adjusts the nut to match the force of the intermediate tension bar for artificial grass fibers of different weights and specifications, so as to avoid the artificial grass fibers being too tight, resulting in uneven turf height, or too loose, resulting in yarn entanglement.

[0013] Furthermore, a through groove is provided on the main shaft, through which the tension rod passes; The bottom of the spindle is connected to a connecting seat, which is connected to a fixed rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are: During the tufting process, the inability to adjust tension due to fixed guide rods or friction wheel structures leads to uneven stress on artificial grass fibers of different weights or specifications during weaving, resulting in an uneven lawn surface. This invention addresses this issue by incorporating a threaded section on the main shaft of a spring rod, with a nut threaded into the shaft. Operators can adjust the preload of the springs on both sides according to the specifications of the artificial grass fibers, achieving flexible tension control and ensuring the grass fibers are always under appropriate tension before entering the tufting needles, significantly improving the uniformity of the lawn surface.

[0015] In traditional unidirectional tension compensation mechanisms, when the tension of the artificial grass fluctuates, compensation can only be provided on the side where the tension increases. This lack of automatic return capability when the tension decreases easily leads to loosening and tangling of the grass fibers. This invention employs a bidirectional spring structure, allowing the central tension rod to compress one spring when the tension increases and automatically return to its original position under the action of the other spring when the tension decreases. This achieves bidirectional compensation, ensuring that the artificial grass fibers maintain stable tension during operation and preventing breakage and tangling caused by insufficient or excessive tension.

[0016] In existing straight or smooth guide rods, the low friction between the grass fibers and the guide rods easily leads to slippage during tufting, resulting in unstable tension and uneven grass fiber arrangement. This invention addresses this by employing a serrated, curved structure for the three tension rods, creating multiple recesses for the artificial grass fibers to embed. This increases the wrap angle and frictional contact area between the grass fibers and the tension rods, preventing slippage during operation and effectively improving the stability of tension transmission.

[0017] During the operation of the tufting machine, fluctuations in the upstream yarn supply speed cause instantaneous increases or decreases in the tension of the straw yarn. Without an effective buffering mechanism, skipped stitches or missed stitches can easily occur at the entry point of the tufting needle. This invention utilizes the sliding fit between the intermediate tension rod and the main shaft, along with the dynamic compensation of the springs on both sides, to enable the intermediate tension rod to automatically shift and quickly return to its original position as the tension changes. This achieves immediate buffering and correction of tension fluctuations, effectively preventing skipped stitches and missed stitches during the tufting process.

[0018] In the threading process, traditional tensioning devices often have tension rods arranged in a coplanar manner, which can easily cause congestion and concentrated friction in the path of the artificial grass fibers. This invention staggers the connection positions of the fixed rod and the three tension rods along the axial direction of the fixed rod, allowing the artificial grass fibers to pass through a smoother zigzag path, reducing threading resistance and jamming, and improving operational convenience and production efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the spring rod of this utility model.

[0020] The attached diagram lists the components represented by each number as follows: 1. Tension device; 2. Artificial grass fibers; 3. Tufting needles; 11. Tension bar; 12. Fixing rod; 13. Spring bar; 131. Spring; 132. Nut; 133. Main shaft; 1331. Through groove; 134. Connecting seat. Detailed Implementation

[0021] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0022] See Figure 1-2 A tufting tension device for infill-free artificial turf includes a fixed rod 12, three tension rods 11, and a spring rod 13. The fixed rod 12 connects the three tension rods 11 in sequence, and the middle tension rod 11 is connected to the fixed rod 12 via the spring rod 13. The fixed rod 12 plays a supporting and positioning role in the overall device, ensuring the stable arrangement of the three tension rods 11. The three tension rods 11 form a continuous guide wire path based on the fixed rod 12, allowing the artificial turf fibers 2 to cross it and form controlled tension. The spring rod 13 forms an adjustment mechanism through an internal main shaft 133 and a nut 132. Springs 131 are respectively sleeved at both ends of the main shaft 133, so that the middle tension rod 11 can achieve force balance under the action of bidirectional elastic force. The nut 132 is installed on the threaded section of the main shaft 133. By rotating the nut 132, the preload of the spring 131 can be changed, thereby realizing the adjustment of the running tension of the artificial turf fibers 2, overcoming the shortcomings of the existing fixed tension structure that cannot flexibly adapt to different turf fibers.

[0023] The spring rod 13 includes a main shaft 133, a nut 132, and a spring 131. The tension rod 11 passes through the through groove 1331 in the middle of the main shaft 133 and slides with the main shaft 133, ensuring that the tension rod 11 can be displaced axially with changes in tension. Springs 131 are respectively sleeved on both sides of the main shaft 133, so that the tension rod 11 in the middle can be compressed or stretched when subjected to tension fluctuations of artificial grass fibers 2. The nut 132 is engaged with the threaded section of the main shaft 133. When the nut 132 rotates along the main shaft 133, it can change the compression of the spring 131, thereby changing the reaction force exerted by the tension rod 11 on the artificial grass fibers 2. Through this structural design, the tension can be adjusted according to the specifications and weight of the artificial grass fibers 2, solving the problem of grass fiber breakage or uneven lawn surface caused by uncontrollable tension in the traditional tufting process.

[0024] See Figure 1-2 The three tension rods 11 are bent in a sawtooth shape to form a recess for the artificial grass fibers 2 to be embedded, thereby improving the limiting and anti-slip effect of the artificial grass fibers 2. The sawtooth bending structure can increase the wrap angle of the artificial grass fibers 2, making it less likely for the grass fibers to slip when passing around the tension rods 11. The frictional contact area formed by the recessed area improves the tension stability and reduces the tension sudden change caused by the speed fluctuation of the grass fibers. This structure solves the problem that existing straight rods or smooth guide rods cannot effectively constrain the grass fibers.

[0025] See Figure 1-2When in use, the artificial grass fibers 2 are wrapped around three tension rods 11 in sequence to form a zigzag path, which increases the wrap angle and friction to stabilize the tension while ensuring smooth threading. Through the three-point zigzag path design, the artificial grass fibers 2 can obtain a large controlled tension in a short space. After the zigzag path is combined with the bidirectional elastic compensation of the spring rod 13, it can effectively balance the tension fluctuation caused by the unstable upstream thread feeding speed and avoid the phenomenon of skipped stitches or missed stitches at the sewing needle 3.

[0026] See Figure 1-2 The main shaft 133 and the intermediate tension rod 11 are axially slidingly fitted. The springs 131 on both sides provide elastic forces in opposite directions to the intermediate tension rod 11 to achieve tension self-reset when in the middle position. This bidirectional compensation structure can release the reverse force by compressing the spring 131 when the grass tension is too high, and push the tension rod 11 back by the spring 131 on the other side when the grass tension is insufficient, thereby achieving automatic compensation. This design overcomes the defect of traditional unidirectional compensation devices that cannot automatically return to the position when the tension decreases.

[0027] See Figure 1-2 The nut 132 rotates forward or backward along the threaded section of the main shaft 133 to change the preload of the springs 131 on both sides, thereby achieving fine adjustment of the tension. By adjusting the preload, the device can flexibly set a suitable tension value according to the different weight and fiber diameter of the artificial grass fibers 2, avoiding excessive tension that could cause the grass fibers to break, and also avoiding insufficient tension that could cause the grass fibers to loosen and become tangled. This structure improves the ability to control the stability of the grass fibers during the production of filler-free artificial turf tufting.

[0028] See Figure 1-2 The connection positions of the fixed rod 12 and the three tension rods 11 are staggered along the axial direction of the fixed rod 12 to facilitate threading and guiding. The staggered arrangement not only makes the path of the artificial grass fibers 2 smoother and reduces friction concentration, but also improves the overall compactness and practicality of the device. This structure makes it more convenient for operators to thread the fibers and reduces the risk of grass fibers getting stuck.

[0029] See Figure 1-2 The device is used in the tufting production process of infill-free artificial turf. For artificial grass fibers 2 with different weights and specifications, the force of the intermediate tension bar 11 is matched by adjusting the nut 132 to avoid the artificial grass fibers 2 being too tight, causing uneven grass height on the carpet surface, or too loose, causing yarn entanglement. Through this structure, the production process can better adapt to the requirements of infill-free turf for the uniformity of grass fibers, thereby ensuring the flatness and durability of the finished turf.

[0030] See Figure 1-2A through groove 1331 is provided on the main shaft 133, through which the tension rod 11 passes. The through groove 1331 provides a sliding guide space for the tension rod 11, allowing the tension rod 11 to move flexibly according to the tension of the artificial grass fibers 2. A connecting seat 134 is connected to the bottom of the main shaft 133. The connecting seat 134 is connected to the fixed rod 12 by means of threads or welding, ensuring the firmness and stability of the entire device. The connecting seat 134, as a load-bearing component, reliably connects the spring rod 13 and the fixed rod 12, so that the tufting tension device 1 can work stably for a long time without loosening or displacement.

[0031] The working principle of this utility model is as follows: The tufting tension device 1 is fixed to the fixed rod 12 via the connecting seat 134; the main shaft 133 of the spring rod 13 is set vertically (or along the machine axis), and the through groove 1331 on the main shaft 133 cooperates with the tension rod 11 in the middle, so that the tension rod 11 can slide along the axis of the main shaft 133; the threaded end of the main shaft 133 is threadedly engaged with the nut 132, and the preload of the springs 131 on both sides is changed by tightening or loosening the nut 132, and the initial tension reference is set.

[0032] After the artificial grass fibers 2 enter from the upstream, they successively cross the three tension rods 11 to form a zigzag path; the serrated shape of the tension rods 11 provides a limiting recess at its trough, increasing the wrap angle and contact length between the artificial grass fibers 2 and the tension rods 11, preventing the artificial grass fibers 2 from slipping and stabilizing the direction of the fibers; then the artificial grass fibers 2 are fed into the tufting needle 3 for tufting.

[0033] When the artificial grass fibers 2 enter at a constant speed, the middle tension rod 11 is in a mechanical neutral position under the action of the bidirectional spring 131 of the spring rod 13. The three tension rods 11 provide basic tension and guidance for the artificial grass fibers 2. At this time, the preload of the spring 131 is set by the nut 132, which determines the nominal tension level of the device on the artificial grass fibers 2.

[0034] In the actual tufting process, the tension of artificial grass fibers 2 will increase or decrease due to fluctuations in the upstream fiber supply speed or changes in instantaneous resistance. When the tension increases, the artificial grass fiber 2 pulls the tension rod 11 in the middle along the main shaft 133 through the through groove 1331 to slightly displace in the direction of force, so that the spring 131 on this side is compressed and the spring 131 on the other side is released accordingly. The spring rod 13 provides a reverse restoring force to counteract the upward tension. When the tension decreases, the tension bar 11 in the middle is displaced in the opposite direction by the spring 131 on the other side, automatically compensating for the slack in the wire feeding.

[0035] Through the aforementioned bidirectional elastic compensation, the middle tension bar 11 self-resets around the center position, continuously maintaining the artificial grass fibers 2 at a near-constant working tension.

[0036] When changing to artificial grass fibers 2 of different specifications or weights, the operator rotates nut 132 to change the preload of spring 131, thereby changing the reference tension of device 1; when higher stability is required, the preload can be appropriately increased to improve the suppression of tension fluctuations; when low tension conveying is required, the preload can be reduced to adapt.

[0037] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A tufting tension device for infill-free artificial turf, characterized in that, It includes a fixed rod (12), three tension rods (11) and a spring rod (13); the fixed rod (12) is connected to the three tension rods (11) in sequence, and the tension rod (11) in the middle is connected to the fixed rod (12) via the spring rod (13); The spring rod (13) includes a main shaft (133), a nut (132) and a spring (131). The tension rod (11) passes through the middle of the main shaft (133) and slides with it. The spring (131) is respectively sleeved on both sides of the tension rod (11) in the middle of the main shaft (133). One end of the main shaft (133) is provided with a threaded section and is threaded with the nut (132) so as to adjust the force on the tension rod (11) in the middle relative to the fixed rod (12) by the axial movement of the nut (132), thereby adjusting the running tension of the artificial grass fibers.

2. The tufting tension device according to claim 1, characterized in that, The three tension bars (11) are serrated to form recesses for embedding artificial grass fibers, thereby improving the positioning and anti-slip effect of the artificial grass fibers.

3. The tufting tension device according to claim 2, characterized in that, When in use, the artificial grass fibers are wrapped around the three tension bars (11) in sequence to form a zigzag path, so as to increase the wrap angle and friction to stabilize the tension while ensuring smooth threading.

4. The tufting tension device according to claim 1, characterized in that, The main shaft (133) and the middle tension rod (11) are axially slidingly fitted, and the springs (131) on both sides provide elastic forces in opposite directions to the middle tension rod (11) to achieve tension self-reset when in the middle position.

5. The tufting tension device according to claim 1, characterized in that, The nut (132) rotates forward or backward along the threaded section of the main shaft (133) to change the preload of the springs (131) on both sides, thereby achieving fine adjustment of the tension.

6. The tufting tension device according to claim 1, characterized in that, The connection positions of the fixed rod (12) and the three hand tension rods (11) are staggered along the axial direction of the fixed rod (12) to facilitate threading and guiding.

7. The tufting tension device according to any one of claims 1 to 6, characterized in that, The device is used in the tufting production process of fillerless artificial turf. For artificial grass fibers of different weights and specifications, the force of the tension bar (11) in the middle is matched by adjusting the nut (132) to avoid the artificial grass fibers being too tight, causing the carpet grass to be uneven or too loose, causing the yarn to entangle.

8. The tufting tension device according to claim 1, characterized in that, A through groove (1331) is provided on the main shaft (133), and the tension rod (11) passes through the through groove (1331); The bottom of the main shaft (133) is connected to a connecting seat (134), which is connected to the fixed rod (12).

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