A new type of multi-step down pin for the apron of a spinning frame

Abstract

The utility model discloses a new type multi-step down pin for apron of spinning frame, any section shape of apron down pin is same, is constituted by one shape same T type body, and the upper surface of T type horizontal character portion includes linear portion and curve portion, linear portion and curve portion are connected, and curve portion is all higher than linear portion, and linear portion has certain thickness, and curve portion includes first bending unit, second bending unit and third bending unit that are connected in proper order. Through the ladder structure of down pin, makes the upper and lower apron more closely, and the distance of fiber bundle control in whole front body area also has the improvement, has improved apron tension, has improved the support of down pin to apron, makes the upper and lower apron more closely, increases the control of apron to fiber bundle in whole apron holding area, makes the whole draft process more effective, finally makes the fiber bundle of whole draft process to be effectively controlled, thereby improves the evenness CV of yarn, reduces thick and thin spots.

Description

Technical Field

[0001] This invention relates to the technical field of spinning machine components, and more particularly to a novel multi-step lower pin used in spinning machine aprons. Background Technology

[0002] The spinning frame is an important piece of equipment in the textile industry, and the drafting section is one of its core components. The drafting section of a spinning frame mainly consists of three pairs of rollers, aprons, apron pins, a rocker arm, and a pressure mechanism. These components work together to complete the drafting process.

[0003] In the operation of a spinning machine, the drafting section plays a crucial role. Its workflow is roughly as follows:

[0004] 1. The cooperation between the roller and the apron: During the drafting process, the roller and the apron work closely together to form a certain drafting force, which stretches the yarn.

[0005] 2. Yarn feeding and output: The yarn is fed in from the back roller, and after being drafted through the middle roller and the front roller, it is finally output from the front roller.

[0006] 3. Functions of the cradle and pressure mechanism: The cradle supports the roller, maintaining its stability during operation. The pressure mechanism applies appropriate pressure to the roller to ensure that the yarn maintains a certain tension and stability during drafting.

[0007] The drafting section of a spinning frame plays a crucial role in the spinning process. It not only meticulously stretches the yarn to achieve the required fineness and uniformity, but also controls the yarn density and strength by adjusting the draft ratio. This is of great significance for improving the quality of textiles and meeting diverse production needs.

[0008] Innovation in drafting mechanisms requires significant cost investment and yields limited results. Currently, improvements to the underpin structure within the drafting mechanism can directly and effectively improve yarn quality. Traditional underpins have a relatively simple structure, resulting in insufficient control of the yarn by the apron. A large amount of yarn within the apron control area cannot participate in the drafting process, and the apron tension is unstable, failing to effectively control the fiber bundles. If the underpin structure can be designed rationally, yarn quality indicators can be significantly improved at a very low cost.

[0009] Therefore, improvements are needed to the drawing portion in the existing technology to solve the above problems. Summary of the Invention

[0010] This utility model overcomes the shortcomings of the prior art and provides a novel multi-step lower pin for use in the apron of a spinning machine.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rubber band lower pin, wherein any cross-sectional shape of the lower pin is the same, consisting of a T-shaped body, and the upper surface of the horizontal part of the T-shape includes a straight part and a curved part, the straight part and the curved part are connected, the curved part is higher than the straight part, the straight part has a certain thickness, and the length of the straight part is 4.38-8.28mm; the curved part includes a first bending unit, a second bending unit and a third bending unit connected in sequence, the first bending unit is connected to the straight part, the length of the curved part is 15.84-19.74mm, and the height of its highest point from the upper surface of the straight part is 2.51-3.21mm, and the thickness of the straight part is 2-3.5mm.

[0012] In a preferred embodiment of the present invention, the lengths of the first bending unit, the second bending unit, and the third bending unit are 6.5 mm, 3.8 mm, and 7.49 mm, respectively, and the length of the curved portion is 17.79 mm.

[0013] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0014] (1) This invention provides a novel multi-step lower pin for use in a yarn spinning machine. Through the step structure of the lower pin, the upper and lower aprons fit more tightly, and the distance for controlling the fiber bundle in the entire front area is also improved. Compared with the prior art, the tension of the apron is improved, and the fiber bundle is effectively controlled in the entire drafting process, thereby improving the yarn evenness CV and reducing thick and thin places.

[0015] (2) In this utility model, by changing the lower pin structure to a multi-step shape, the support force of the lower pin on the rubber ring is improved, and the upper and lower rubber rings fit more tightly. Compared with the prior art, the control of the rubber ring on the fiber bundle in the entire rubber ring holding area is increased, making the entire stretching process more effective.

[0016] (3) In this utility model, the straight part lays a solid foundation, and the combination of multiple curved units in the curved part makes the pressure distribution more reasonable, so that the rubber ring always keeps in the correct position and avoids equipment vibration and noise caused by the change of the rubber ring position, thereby improving the stability of the entire textile equipment operation, reducing the equipment failure rate, and reducing downtime for maintenance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a plan view of a preferred embodiment of the present invention.

[0019] In the diagram: A, straight section; B, first bending unit; C, second bending unit; D, third bending unit; E, curved section; H1, thickness of the straight section; H2, height of the highest point of the curved section from the upper surface of the straight section. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0022] like Figure 1 As shown, a rubber band lower pin has the same cross-sectional shape, consisting of a T-shaped body. The upper surface of the horizontal section of the T-shape includes a straight section A and a curved section E, which are connected. The curved section E is higher than the straight section A. The straight section A has a certain thickness and a length of 4.38-8.28 mm. The curved section E includes a first bending unit B, a second bending unit C, and a third bending unit D connected in sequence. The first bending unit B is connected to the straight section A. The length of the curved section E is 15.84-19.74 mm, and the height H2 of the highest point of the curved section from the upper surface of the straight section is 2.51-3.21 mm. The thickness H1 of the straight section is 2-3.5 mm.

[0023] A novel multi-step lower pin for use on spinning frame aprons allows for a tighter fit between the upper and lower aprons through its stepped structure. It also increases the distance for fiber bundle control throughout the front area. Compared to existing technologies, this improves apron tension and ultimately enables effective control of the fiber bundle throughout the drafting process, thereby increasing yarn evenness (CV) and reducing thick and thin places.

[0024] By changing the bottom pin structure to a multi-step shape, the support force of the bottom pin on the rubber band is improved, making the upper and lower rubber bands fit more tightly. Compared with the existing technology, the control of the fiber bundle by the rubber band in the entire rubber band holding area is increased, making the entire drafting process more efficient.

[0025] The lower pin of the apron, through its unique T-shaped structure and the combination of the curved section E and the straight section A, can more evenly distribute vertical pressure, enabling the apron to maintain stable tension during drafting and reducing fiber control failure caused by uneven tension. This design allows the apron to form a more stable and consistent frictional interface during operation, whether in contact with the middle roller or the upper pin, thereby effectively controlling fiber movement and reducing the dispersion of fiber speed change points.

[0026] The straight section A provides a certain base thickness and length, offering stable support for the apron. The curved section E, through its three sequentially connected bending units, forms a gradually rising curved surface. This design not only increases the contact area between the apron and the lower pin but also, through the change in curvature, subjects the apron to more even and stable pressure during operation. This uniform pressure distribution helps reduce slack and arching of the apron during operation, thus maintaining the apron's tension, generating uniform pressure on the fibers, and effectively controlling fiber movement.

[0027] When the pressure of the drafting device changes periodically, the design of the apron pin concentrates the fiber speed change points, reducing shift deviation and thus minimizing the occurrence of thick and thin places. Simultaneously, its stable tension control also helps reduce yarn defects caused by apron buckling or stalling.

[0028] The straight section A lays a solid foundation, while the multi-bending unit combination of the curved section E makes the pressure distribution more reasonable, ensuring that the rubber ring always operates in the correct position, avoiding equipment vibration and noise caused by the position change of the rubber ring, thereby improving the stability of the entire textile equipment operation, reducing the equipment failure rate, and reducing downtime for maintenance.

[0029] When using this invention, the lower pin of the rubber band should be accurately placed in the designated installation position. Adjust the position of the lower pin so that the direction and angle of its T-shape meet the design requirements, ensuring that the straight part A is placed horizontally and the bending direction of the curved part E is correct, matching the subsequent movement trajectory of the rubber band.

[0030] Slowly slip the rubber band onto the T-shaped horizontal section of the lower pin. During insertion, avoid twisting, folding, or overstretching the rubber band, ensuring it fits evenly and smoothly onto both the straight section A and the curved section E of the lower pin. For rubber bands requiring special installation sequences or techniques, strictly follow the equipment's operating manual.

[0031] After installation, make initial adjustments to the positions of the lower pin and the rubber band. Check the fit between the rubber band and the lower pin to ensure there are no obvious gaps or excessive tightness. At the same time, check the relative position and spacing of the lower pin with other adjacent components (such as the middle roller, upper pin, etc.) to ensure there is no interference or collision between them.

[0032] Example 1: A rubber band underpin, wherein any cross-sectional shape of the rubber band underpin is the same, consisting of a T-shaped body, and the upper surface of the horizontal part of the T-shape includes a straight part A and a curved part E, which are connected. The curved part E is higher than the straight part A. The straight part A has a certain thickness. The curved part E includes a first bending unit B, a second bending unit C, and a third bending unit D connected in sequence. The first bending unit B is connected to the straight part A. The lengths of the first bending unit B, the second bending unit C, and the third bending unit D are 6.5 mm, 3.8 mm, and 7.49 mm, respectively. The length of the curved part E is 17.79 mm.

[0033] The example used in Example 1 is a rubber ring underpin with announcement number CN202023087233.

[0034] Experiments were conducted on Example 1 and Control Example 1 under the same test conditions, namely the same spinning machine, the same roving, the same process, the same spindle and process, and the same temperature and humidity. The experimental machine was a USTER TESTER 6, spinning conventional 40-count ring-spun yarn (twist 886 T / m). The data are the average values ​​of a large number of experiments, and the test data are shown in Table 1.

[0035] Table 1. Experimental data for Comparative Example 1 and Example 1

[0036] index CVm% Details - 50 Details-30 Thick section 35 Thick section 50 140 cotton knots 200 cotton knots 400 cotton knots Compare with Example 1 12.17 1 914 219 17 139 30 2 Example 1 11.82 0 774 169 14 109 23 3

[0037] As shown in Table 1, this application has advantages.

[0038] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A type of leather ring underpin, characterized in that, The cross-sectional shape of the lower pin of the rubber band is the same in all cases, consisting of a T-shaped body. The upper surface of the horizontal part of the T-shape includes a straight section and a curved section, which are connected. The curved section is higher than the straight section. The straight section has a certain thickness and a length of 4.38-8.28 mm. The curved section includes a first bending unit, a second bending unit, and a third bending unit connected in sequence. The first bending unit is connected to the straight section. The length of the curved section is 15.84-19.74 mm, and the height of its highest point from the upper surface of the straight section is 2.51-3.21 mm. The thickness of the straight section is 2-3.5 mm.

2. The lower pin of the rubber band according to claim 1, characterized in that, The lengths of the first bending unit, the second bending unit, and the third bending unit are 6.5 mm, 3.8 mm, and 7.49 mm, respectively, and the length of the curved portion is 17.79 mm.

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