A semi-worsted spinning frame drafting pin assembly

Abstract

This invention discloses a drafting top pin assembly for a semi-worsted spinning machine, comprising a top pin body, which includes a rubber ring support frame and a central support body. Two rubber ring support frames are symmetrically arranged on the left and right sides of the central support body. The rear end of the central support body is provided with two symmetrically arranged fixing hooks. The rubber ring support frame is used to install rubber rings. Each rubber ring support frame includes an inner baffle and an outer baffle arranged symmetrically on the left and right sides. A support base is provided between adjacent inner and outer baffles. An elastic support element is provided on the support base. The rubber ring is wrapped around the outside of the top pin roller and the elastic support element. The elastic support element is used to adaptively adjust the tension of the rubber ring. The central support body is provided with an elastic pressure mechanism. This top pin provides uniform and stable support force to the rubber ring, and provides balanced and controllable fiber grip, improving the evenness of the spun product, reducing the ratio of thick to thin fibers, and is suitable for processing medium and long fibers.

Description

Technical Field

[0001] This invention relates to the field of spinning equipment technology, specifically to a drafting pin assembly for a semi-worsted spinning frame. Background Technology

[0002] A spinning machine is a spinning machine that takes semi-finished roving or sliver and winds it into fine yarn tubes during the spinning process. Most existing semi-worsted spinning machines use cotton spinning equipment processes for drafting.

[0003] The upper roller is a crucial component of the drafting section of a spinning frame. Together with the middle roller, housing, lower roller, and upper and lower rubber rings, it forms the central friction interface, enabling flexible control of the fiber and significantly impacting yarn quality. Existing cotton spinning frames use a mechanical leaf spring-type cradle to support the upper and lower rubber rings for drafting. However, this method of drafting yarn via a cotton spinning frame has drawbacks. The limitation is that it only supports fibers with a length of approximately 24 to 50 millimeters. Since some raw material varieties have longer fibers with higher uniformity and individual fiber strength, this results in poor yarn evenness. The conventional top pins used in cotton spinning are structurally limited and cannot provide sufficient holding force. In addition, when processing medium-length fiber yarns such as 60 mm to 90 mm long, the overall size limitation of the conventional top pins prevents a large number of medium-length fibers from being drafted, resulting in yarn drafting failure or product quality not meeting requirements. Furthermore, when using existing top pins for drafting, the small drafting spacing of the top pins causes the fibers to break, forming irregular short fibers, which severely reduces the yarn strength, causing difficulties in subsequent processing. The shortened fibers also lead to increased yarn hairiness and decreased smoothness, ultimately affecting the yarn quality. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention relates to a drafting upper pin assembly for a semi-worsted spinning frame. This assembly is simple and reliable, effectively solves the aforementioned technical problems, and is suitable for widespread use. To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A drafting upper pin assembly for a semi-worsted spinning frame includes an upper pin body. The upper pin body includes a rubber ring support frame and a central support body. Two rubber ring support frames are symmetrically arranged on the left and right sides of the central support body. The rear end of the central support body is provided with two symmetrically arranged fixing hooks. The fixing hooks are provided with arc-shaped limiting grooves adapted to the upper pin roller shaft. The rubber ring support frame is used to install the rubber ring. Each rubber ring support frame includes an inner baffle and an outer baffle arranged symmetrically on the left and right sides. The central support body is located between two adjacent inner baffles. A support base is provided between adjacent inner baffles and outer baffles. An elastic support element is provided on the support base. The rubber ring is wrapped around the outer side of the upper pin roller shaft and the elastic support element, and its left and right sides are limited by the inner baffle and the outer baffle respectively. The elastic support element is used to adaptively adjust the tension of the rubber ring. The central support body is provided with an elastic pressure mechanism. The elastic pressure mechanism is used to apply pressure to the upper pin body to move towards the lower pin side after the upper pin body is installed by the cradle.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the upper pin body is made of carbon fiber.

[0007] Based on the above scheme and as a preferred embodiment: the elastic support element is a metal spring sheet, which is mounted on the support base of the rubber ring support frame by fixing screws. The metal spring sheet includes a continuously connected arc-shaped fixing segment, a first straight support segment, and a second straight support segment. The first straight support segment is inclined and located above the support base. The second straight support segment is formed by bending and extending one end of the first straight support segment. The angle between the second straight support segment and the support base is greater than the angle between the first straight support segment and the support base. The end of the second straight support segment away from the first straight support segment abuts against the inner side of the rubber ring. The metal spring sheet is used to provide tension to the rubber ring.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the front side of the central support body is provided with an inclined mounting surface, the mounting surface having the same inclination trend as the metal spring sheet, and a limiting post is provided on the mounting surface, the limiting post being used to cooperate with the mounting recess of the spacer block so that the spacer block can be fitted and fixed on the mounting surface.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the maximum length of the upper pin body is 79.4 mm, the maximum width of the upper pin body is 111.2 mm, the center distance between the two support bases is 74.6 mm, and the distance between adjacent inner baffles and outer baffles is 31.7 mm.

[0010] Based on the above scheme and as a preferred embodiment: the elastic pressurizing mechanism includes a pressurizing cap, a spring-positioned telescopic support rod, a pressurizing spring, and a positioning screw. The central support body has a vertically extending mounting hole. The pressurizing cap is adapted to the shape of the mounting hole and is slidably connected. A threaded connecting sleeve is fixed in the middle of the mounting hole. A through hole is provided below the mounting hole. The positioning screw passes through the through hole and is threadedly fitted to the threaded connecting sleeve. A positioning hole is provided at the top of the positioning screw. The spring-positioned telescopic support rod is located in the positioning hole and its top end abuts against the pressurizing cap. Two pressurizing springs are symmetrically arranged on both sides of the spring-positioned telescopic support rod. A limiting hole adapted to the pressurizing spring is provided at the bottom of the pressurizing cap. The pressurizing spring is arranged parallel to the spring-positioned telescopic support rod. The pressurizing spring is used to provide pressure for the pressurizing cap to move upward when compressed and contracted.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the top of the pressure cap is provided with an arched pressure surface.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the four corners of the pressure cap are provided with two symmetrical concave limiting grooves, the limiting grooves extend in the vertical direction, and the mounting hole of the central support body is provided with a limiting protrusion that cooperates with the limiting groove.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the elastic support element includes a connecting seat, a support plate, and a support plate. The connecting seat is fixedly installed above the support base. The support plate is hinged to the connecting seat. A torsion spring is wound around the outside of the connecting shaft of the connecting seat. A telescopic rod is provided at each of the four corners of the surface of the support plate. The support plate is arranged parallel to the support plate and connected through the telescopic rod. A buffer spring is sleeved on the outside of each telescopic rod.

[0014] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0015] 1. The main body of this upper pin is made of carbon fiber, which has the characteristics of high temperature resistance, friction resistance, thermal conductivity and corrosion resistance. Due to the low density of carbon fiber, it has high specific strength and specific modulus, uniform and stable support force for the rubber ring, and balanced and controllable holding of the fiber, thereby improving the various physical properties of the spun yarn.

[0016] 2. Using a metal spring sheet as the tension adjustment component ensures stable tension applied to the rubber ring, guaranteeing that the elastic jaws always have good self-adjusting properties. The structure is simple and effective.

[0017] 3. The spacer block mainly serves to adjust the drafting force. Its purpose is to make the drafting force and the holding force compatible. The size of the spacer block can be selected according to the specific conditions such as the roving weight, rubber ring thickness, fiber length, and pressure. It is beneficial to enhance the friction interface and, together with the adjustment of the upper pin holding spacer, control the displacement deviation of the floating fibers.

[0018] 4. The elastic pressure mechanism is ingeniously designed. Under the pressure of the cradle, it works under force and transfers the pressure evenly and evenly towards the roller direction, providing a certain initial pressure so that the upper pin always presses down on the lower pin. This ensures that the upper and lower rubber rings fit tightly together to achieve effective control of the fiber and ensure the gripping effect on the fiber. The upper and lower rubber rings are controlled by the gripping force. Through the elastic control of the rubber rings, the fiber is transferred forward to the nip in a stable and concentrated manner, so that the drafted yarn has good evenness and yarn properties.

[0019] 5. The overall length of the upper pin body is greater than the existing upper pin length. While maintaining or even increasing its gripping force and drafting angle on the fiber, the drafting distance between the middle upper roller (upper pin roller) and the front upper roller (front roller) is increased to match the length of the spun fiber. By utilizing the downward pressure of the upper pin nip line, effective control of the fiber is achieved, greatly enhancing the frictional boundary of the fiber entering the front roller nip, strengthening the effective control of floating fibers, reducing the floating stroke of the fiber, changing the loose fiber phenomenon in planar drafting, reducing over-gripping and keeping the grip uniform and effective. Due to the downward pressure of the upper pin, the fiber is conveyed close to the front roller, reducing the diffusion of floating fibers and increasing the density. The fiber speed change point is concentrated and moved forward stably, thereby improving the evenness of the spun product, reducing the ratio of thick to thin threads, increasing yarn strength and reducing hairiness. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the upper pin.

[0021] Figure 2 This is a side sectional view of the upper pin structure;

[0022] Figure 3 This is a schematic diagram of the bottom of the upper pin;

[0023] Figure 4 This is a schematic diagram of a metal spring sheet;

[0024] Figure 5 This is a graph of existing online yarn evenness test data;

[0025] Figure 6 This is a graph showing the test data of yarn evenness in the spun yarn of the present invention;

[0026] Figure 7 This is a schematic diagram of the elastic support component in Embodiment 2. Detailed Implementation

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] To solve the above technical problems, such as Figure 1-4 As shown, this invention designs a drafting upper pin assembly for a semi-worsted spinning machine. Specifically, it includes an upper pin body, which comprises a rubber ring support frame 1 and a central support body 2. Two rubber ring support frames 1 are symmetrically arranged on the left and right sides of the central support body 2. The rubber ring support frame 1 and the central support body 2 are integrally formed. The rear end of the central support body 2 is provided with two symmetrical fixing hooks 3, which extend from the rear end of the central support body 2. The fixing hooks 3 are provided with arc-shaped limiting grooves adapted to the upper pin roller shaft. The upper pin body is fitted into the groove of the upper pin roller shaft by the fixing hooks 3 and can swing flexibly around its axis. The fixing hooks 3 are locked in the groove of the upper pin roller shaft to prevent it from sliding left and right and increase the stability of the connection structure. Preferably, the front end of the upper pin structure is provided with stainless steel wear-resistant edges, which can effectively reduce rotational resistance and increase the wear resistance of the upper pin to extend its service life.

[0033] The rubber ring support frame 1 is used to install the rubber ring. Each rubber ring support frame 1 includes an inner baffle 11 and an outer baffle 12 symmetrically arranged on the left and right. The middle support body 2 is located between two adjacent inner baffles 11. A support base 13 is provided between adjacent inner baffles 11 and outer baffles 12. An elastic support element is provided on the support base 13. Specifically, the elastic support element is preferably a metal spring plate 4. The metal spring plate 4 is installed on the support base 13 of the rubber ring support frame 1 by fixing screws 5. The metal spring plate 4 includes an arc-shaped fixing segment 41, a first straight support segment 42, and a second straight support segment 43 connected in sequence. The first straight support segment 42 is inclined and located above the support base 13. The second straight support segment 43 is formed by bending and extending one end of the first straight support segment 42. The angle between the second straight support section 43 and the support base 13 is greater than the angle between the first straight support section 42 and the support base 13. The end of the second straight support section 43 away from the first straight support section 42 abuts against the inner side of the rubber ring. The rubber ring is wrapped around the outer side of the upper pin roller shaft and the metal spring sheet 4, and the left and right sides are limited by the inner baffle 11 and the outer baffle 12 respectively. The metal spring sheet 4 can adaptively adjust and increase the tension of the rubber ring, effectively improving the extensibility of the rubber ring. The installation method of the fixing screw 5 makes the metal spring sheet 4 stable and easy to disassemble and assemble, and facilitates subsequent maintenance and replacement of parts. The arc structure design can enhance the deformation resistance of the metal spring sheet 4. Using the metal spring sheet as a tension adjustment component can ensure that a stable tension acts on the rubber ring, ensuring that the elastic jaw always has a good self-adjusting effect. The structure is simple and effective.

[0034] Furthermore, the front side of the central support 2 is provided with an inclined mounting surface, which has the same inclination trend as the metal spring sheet 4. A limiting post 6 is provided on the mounting surface, which is used to cooperate with the mounting recess of the spacer block so that the spacer block can be fitted and fixed on the mounting surface. The spacer block can be a 2.5 mm to 8 mm fine yarn special spacer block. The spacer block mainly plays the role of adjusting the draft force, and its purpose is to make the draft force adapt to the holding force. The size of the spacer block can be selected according to the specific conditions such as the roving weight, rubber ring thickness, fiber length, and pressure, which is conducive to enhancing the friction interface and cooperating with the adjustment of the upper pin holding spacer distance to control the displacement deviation of the floating fiber.

[0035] The central support 2 is also provided with an elastic pressure mechanism 7. This mechanism is used to apply pressure to the upper pin body after it is installed, under the pressure of the cradle, to move it towards the lower pin side. Specifically, the elastic pressure mechanism 7 includes a pressure cap 71, a spring-loaded telescopic support rod 72, a pressure spring 73, and a positioning screw 74. The central support 2 has a vertically extending mounting hole 21. The pressure cap 71 has a rectangular structure and is adapted to the shape of the mounting hole 21 and slides within it. A threaded connecting sleeve is fixed in the center of the mounting hole 21. A through hole is provided below the mounting hole 21. The positioning screw 74 passes through the through hole and is threadedly engaged with the threaded connecting sleeve. A positioning hole is provided at the top of the positioning screw 74, and the spring-loaded telescopic support rod 72 is located in the positioning hole. Its top end abuts against the pressure cap 71, and two pressure springs 73 are symmetrically arranged on both sides of the spring positioning telescopic support rod 72. The bottom of the pressure cap 71 is provided with a limiting hole that matches the pressure spring 73. The pressure spring 73 is arranged parallel to the spring positioning telescopic support rod 72. The pressure spring 73 is used to provide pressure to the pressure cap 71 to move upward when it is compressed and contracted. Therefore, it works under the pressure of the cradle and keeps its pressure evenly and evenly transferred to the roller direction, providing a certain initial pressure so that the upper pin always presses down on the lower pin, so that the upper and lower rubber rings fit tightly to achieve effective control of the fiber and ensure the gripping effect of the fiber. The upper and lower rubber rings are controlled by the gripping force. Through the elastic control of the rubber rings, the fiber is transferred forward to the nip in a stable and concentrated manner, so that the drafted yarn has good evenness and yarn index.

[0036] Preferably, the top of the pressure cap 71 is provided with an arched pressure surface. The arched structure is stronger and more stable, and when pressure is applied, the pressure can be concentrated to a smaller contact surface, thereby enhancing the grip control effect.

[0037] Preferably, the pressure cap 71 has two symmetrically recessed limiting grooves 75 at its four corners. The limiting grooves 75 extend in the vertical direction. The mounting hole 21 of the central support body 2 has a limiting protrusion 22 that cooperates with the limiting groove 75. The cooperation between the limiting groove 75 and the limiting protrusion 22 can ensure the accuracy of the movement of the pressure cap 71, avoid deviation and jamming during the movement, and ensure the smoothness of the movement and the stability of the sliding structure.

[0038] In this embodiment, it is further preferred that, unlike existing top pins which are usually made of nylon, the top pin body of the present invention is made of carbon fiber, which has the characteristics of high temperature resistance, friction resistance, thermal conductivity and corrosion resistance. Due to the preferred orientation of its graphite microcrystalline structure along the fiber axis, carbon fiber has high strength and modulus along the fiber axis. Carbon fiber has low density, so its specific strength and specific modulus are high. It provides uniform and stable support for the rubber ring and balanced and controllable holding of the fiber, thereby further improving the various physical properties of the spun yarn.

[0039] In this embodiment, it is further preferred that the maximum length of the upper pin body is 79.4 mm, the maximum width of the upper pin body is 111.2 mm, the center distance between the two support bases 13 is 74.6 mm, and the distance between adjacent inner baffles 11 and outer baffles 12 is 31.7 mm. The overall length is greater than the existing upper pin length. While maintaining or even increasing its gripping force and drafting angle on the fiber, it increases the drafting distance between the middle upper roller (upper pin roller) and the front upper roller (front roller), making it conform to the fiber being spun. The length is controlled by the downward pressure of the upper pin nip line, which greatly enhances the frictional force of the fibers entering the front roller nip, strengthens the effective control of floating fibers, reduces the floating stroke of the fibers, changes the looseness of planar drafted fibers, reduces excessive grip and keeps the grip uniform and effective. Because the upper pin presses down, the fibers are conveyed close to the front roller, which reduces the diffusion of floating fibers and increases the density. The fiber speed change point is concentrated and moved forward stably, thereby improving the evenness of the spun products, reducing the ratio of thick to thin threads, increasing yarn strength and reducing hairiness.

[0040] It is worth mentioning that by adopting the extended top pin, the range of friction in the middle zone is extended, which strengthens the control of the fiber's variable speed movement and relatively increases the drafting force. If the holding force is not adjusted and the two become unbalanced, the roving may easily become stiff, affecting the yarn quality. Therefore, in this invention, through the optimization of the materials of each component and the design optimization of the pressure structure, the top pin can simultaneously increase the holding force of the sliver in the drafting zone, so as to adapt to the increased drafting force due to the use of the extended top pin, thereby achieving the purpose of stabilizing the yarn quality. The entire top pin assembly structure complements each other.

[0041] like Figure 5 and Figure 6 A comparison of the spinning parameters of the existing top pin assembly and the top pin assembly of the present invention under working conditions shows that the yarn evenness (quality coefficient of variation CV%) is significantly reduced, indicating that the degree of uneven distribution of fiber quality in the yarn along the length direction (i.e., yarn evenness) is reduced, thus improving yarn evenness. At the same time, the values ​​of fine and thick places per kilometer are reduced, indicating that the spinning quality is improved.

[0042] This invention also relates to a method for installing an upper pin assembly, specifically as follows:

[0043] S1, Remove the original front roller seat, process the front roller seat according to the actual spacing requirements, and install it horizontally on the front of the car;

[0044] S2, adjust the spacing of the upper and middle roller slides according to the actual spacing requirements, ensuring that the rollers are level, concentric, and spaced evenly.

[0045] S3, remove the original upper pin assembly, assemble the upper pin component involved in this invention, and configure the upper pin rubber ring, spacer block, and upper pin rubber roller according to actual needs. After assembly, install it on the vehicle.

[0046] S4. Adjust the front end of the upper pin assembly to be flush with the front end of the lower pin, and the corner position of the front end of the upper pin rubber ring to be flush with the corner position of the front end of the lower pin rubber ring. Adjust the distance between the front end of the upper pin and the front rubber roller to be between 1-5mm.

[0047] Considering that using a metal spring as an elastic support in the above embodiments has a drawback—that the metal spring is subjected to external loads and stresses during continuous operation—this continuous load and stress may lead to fatigue fracture, resulting in a short service life, requiring frequent maintenance and parts replacement, and affecting processing stability—in order to solve this technical problem, such as... Figure 7 As shown, in another possible embodiment, the elastic support element includes a connecting seat 81, a support plate 82, and a support plate 83. The connecting seat 81 is fixedly installed above the support base 13. The support plate 82 is hinged to the connecting seat 81. A torsion spring is wound around the outside of the connecting shaft 86 between the support plate 82 and the connecting seat 81. One end of the torsion spring abuts against the bottom of the support plate, and the other end abuts against the support base 13. The torsion spring is used to provide the support plate 82 with elastic force to resist torsion. A telescopic rod 84 is provided at each of the four corners of the surface of the support plate 82. The support plate 83 is arranged parallel to the support plate 82 and connected by the telescopic rod 84. A buffer spring 85 is sleeved on the outside of each telescopic rod 84. The two ends of the buffer spring 85 contact the support plate 83 and the support plate 82 respectively. The spring, as a buffer, can bear a large load. The combination of the components can also serve as a tension adjustment component as an elastic support element, ensuring a stable tension acting on the rubber ring, ensuring that the elastic jaws always have a good self-adjusting effect, and can continuously bear a certain load. It has a large adjustable angle, a long service life, and is also relatively convenient to assemble.

[0048] It is worth noting that the technical features such as rollers, upper pin rollers, and rubber rings involved in this patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated in detail.

[0049] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made by those skilled in the art based on the structure, shape, and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drafting upper pin assembly for a semi-worsted spinning frame, characterized in that: The device includes an upper pin body, which comprises a rubber ring support frame and a central support body. Two rubber ring support frames are symmetrically arranged on the left and right sides of the central support body. The rear end of the central support body is provided with two symmetrically arranged fixing hooks. The fixing hooks are provided with arc-shaped limiting grooves adapted to the upper pin roller shaft. The rubber ring support frame is used to install the rubber ring. Each rubber ring support frame includes an inner baffle and an outer baffle arranged symmetrically on the left and right sides. The central support body is located between two adjacent inner baffles. A support base is provided between adjacent inner baffles and outer baffles. The support base is provided with an elastic support element. The rubber ring is wrapped around the outer side of the upper pin roller shaft and the elastic support element and is limited on the left and right sides by the inner baffle and the outer baffle respectively. The elastic support element is used to adaptively adjust the tension of the rubber ring. The central support body is provided with an elastic pressing mechanism. The elastic pressing mechanism is used to apply pressure to the upper pin body to move towards the lower pin side after the upper pin body is installed by the cradle. The upper pin body is made of carbon fiber; the elastic support element is a metal spring sheet, which is installed on the support base of the rubber ring support frame by fixing screws. The metal spring sheet includes an arc-shaped fixing segment, a first straight support segment, and a second straight support segment connected in sequence. The first straight support segment is inclined and located above the support base. The second straight support segment is formed by bending and extending one end of the first straight support segment. The angle between the second straight support segment and the support base is greater than the angle between the first straight support segment and the support base. The end of the second straight support segment away from the first straight support segment abuts against the inner side of the rubber ring. The metal spring sheet is used to provide tension to the rubber ring.

2. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 1, characterized in that: The front side of the central support body is provided with an inclined mounting surface, which has the same inclination trend as the metal spring sheet. A limiting post is provided on the mounting surface, which is used to cooperate with the mounting recess of the spacer block so that the spacer block can be fitted and fixed on the mounting surface.

3. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 1, characterized in that: The maximum length of the upper pin body is 79.4 mm, the maximum width of the upper pin body is 111.2 mm, the center distance between the two support bases is 74.6 mm, and the distance between adjacent inner and outer baffles is 31.7 mm.

4. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 1, characterized in that: The elastic pressurizing mechanism includes a pressurizing cap, a spring-positioned telescopic support rod, a pressurizing spring, and a positioning screw. The central support body has a vertically extending mounting hole. The pressurizing cap is adapted to the shape of the mounting hole and is slidably connected. A threaded connecting sleeve is fixed in the middle of the mounting hole. A through hole is provided below the mounting hole. The positioning screw passes through the through hole and is threadedly fitted to the threaded connecting sleeve. The top of the positioning screw has a positioning hole. The spring-positioned telescopic support rod is located in the positioning hole and its top end abuts against the pressurizing cap. Two pressurizing springs are symmetrically arranged on both sides of the spring-positioned telescopic support rod. The bottom of the pressurizing cap has a limiting hole adapted to the pressurizing spring. The pressurizing spring is arranged parallel to the spring-positioned telescopic support rod. The pressurizing spring is used to provide pressure to the pressurizing cap to move upward when compressed and contracted.

5. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 4, characterized in that: The top of the pressure cap has an arched pressure surface.

6. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 5, characterized in that: The pressure cap has two symmetrical concave limiting grooves at its four corners, which extend in the vertical direction. The mounting hole of the central support body has a limiting protrusion that cooperates with the limiting groove.

7. The drafting upper pin assembly for a semi-worsted spinning frame according to claim 1, characterized in that: The elastic support element includes a connecting seat, a support plate, and a support plate. The connecting seat is fixedly installed above the support base. The support plate is hinged to the connecting seat. A torsion spring is wound around the outside of the connecting shaft of the connecting seat. A telescopic rod is provided at each of the four corners of the surface of the support plate. The support plate is arranged parallel to the support plate and connected to it through the telescopic rod. A buffer spring is sleeved on the outside of each telescopic rod.

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