A twisting head assembly for a rotor spinning machine

Abstract

The utility model provides a twist head subassembly for rotor spinning machine relates to twister technical field, including the pivot and twist head, the pivot is hollow in the inside, and the one end of pivot is equipped with the yarn inlet, and twist head includes connecting portion, yarn outlet and fixing piece, twist head is connected in the one end of pivot far from yarn inlet through connecting portion, and connecting portion is equipped with through -hole, and fixing piece is located between connecting portion and yarn outlet, and the both sides of fixing piece are cambered surface. The utility model discloses through setting above -mentioned structure, and the through -hole and fixing piece build stable double fixed end twist structure, and twist point is fixed, and does not shift with the swing of airflow or yarn, and moreover twist degree uniformity improves significantly, and yarn structure is more compact, and the strength is high, and the cohesion is good, and the spinning range expands.

Description

Technical Field

[0001] This utility model relates to the field of twisting device technology, and more specifically, to a twisting head assembly for a rotor spinning machine. Background Technology

[0002] Rotor spinning technology is a typical open spinning method that uses a high-speed rotating spinneret to gather, twist, and form yarn from fibers. Current rotor spinning mainly relies on "free-end airflow twist" and friction within the spinneret to achieve twisting, which has the following typical problems:

[0003] 1. In traditional rotor spinning, the twisting point is at the free end. After the yarn leaves the spinning cup, there is no clearly fixed end, and the twist is transmitted by airflow. Due to the unfixed position of the free end and the large airflow disturbance, the twist of the yarn fluctuates significantly, resulting in uneven yarn thickness and insufficient strength.

[0004] 2. The false twist generated by the spinning cup is difficult to effectively transfer back to the end of the fiber, resulting in low twist transfer efficiency, especially in the production of coarse yarn (below 40 count).

[0005] 3. Unlike ring spinning, existing rotor spinning lacks a true "twist fixation zone" and has no stable mechanical twisting unit, resulting in weak fiber cohesion and loose structure, which limits the strength improvement and spinning range of rotor yarn. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a twisting head assembly for rotor spinning machines. The twisting head assembly of this invention provides a stable yarn guiding path and performs secondary twisting on the yarn, thereby improving yarn strength and stability.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a twisting head assembly for a rotor spinning machine, comprising a rotating shaft and a twisting head; the rotating shaft is hollow inside, and one end of the rotating shaft is provided with a yarn inlet; the twisting head includes a connecting part, a yarn outlet, and a fixing member, the twisting head being connected to the end of the rotating shaft away from the yarn inlet via the connecting part, the connecting part being provided with a through hole, the fixing member being disposed between the connecting part and the yarn outlet, and the fixing member having arc surfaces on both sides.

[0008] Preferably, a housing is fitted around the outside of the rotating shaft, and the housing is rotatably connected to the rotating shaft.

[0009] Preferably, a bearing is provided between the rotating shaft and the housing, and there are two bearings, which are respectively located on the inner side of both ends of the housing.

[0010] Preferably, the outer casing has an oil filling hole on its side wall.

[0011] Preferably, the twisting head is provided with a through groove on both sides of the arc surface near the fixing member, the through groove penetrates the twisting head, and the fixing member is located inside the through groove.

[0012] Preferably, the distance between the two arc surfaces of the fixing member is greater than the diameter of the through hole, and the distance between the two arc surfaces of the fixing member is greater than the inner diameter of the yarn outlet.

[0013] Preferably, the twisting head is detachably fixed to the rotating shaft.

[0014] Preferably, the twisting head is detachably connected to the rotating shaft via a pin, the connecting part of the twisting head is provided with a first insertion hole, the rotating shaft is provided with a corresponding second insertion hole, and the pin passes through the first insertion hole and extends into the second insertion hole.

[0015] Preferably, the twisting head is made of ceramic.

[0016] Preferably, the pin is made of metal.

[0017] Preferably, the pin is formed by injection molding.

[0018] Preferably, the pin is formed by injecting adhesive into the first and second sockets and then curing it.

[0019] Preferably, the twisting head can be fixedly connected to the rotating shaft by adhesive bonding, or it can be connected by a pin connection combined with adhesive.

[0020] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0021] This invention provides a twisting head assembly for rotor spinning machines. By setting through holes to define the yarn's passage position, the yarn forms a clearly defined stress point, achieving a "first fixed point" similar to that in ring spinning. This prevents twist from shifting forward and generates twist return resistance. A fixing element is also included; its arc-shaped structure applies flexible friction to the yarn, creating a slight clamping effect and providing a second fixed end. Together, they construct a stable double-fixed-end twisting structure. The twisting point is fixed and does not drift with airflow or yarn movement. Furthermore, twist uniformity is significantly improved, resulting in a denser yarn structure with higher strength and better cohesion, expanding the suitable spinning range, especially for coarser yarns.

[0022] This invention provides a twisting head assembly for a rotor spinning machine. By setting through holes, it not only limits the yarn path but also increases the yarn's resistance, thereby improving the efficiency of false twist return. By setting a hollow cavity in the rotating shaft, it provides a stable straight channel, reducing lateral movement of the yarn within the channel, avoiding energy loss, and allowing twist energy to be concentrated and returned axially. By setting a fixing component, it provides secondary friction damping, further enhancing the twist return efficiency. In summary, using the above structure, the twist can be transmitted to the fiber end, resulting in a compact yarn structure and preventing yarn twist loss, especially for coarse yarns (below 40 count), significantly improving yarn strength. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic cross-sectional view of the present invention along the AA direction.

[0025] The components are: 1. Shaft; 101. Yarn inlet; 2. Twisting head; 201. Connecting part; 202. Yarn outlet; 203. Fixing part; 204. Through hole; 205. Through groove; 3. Outer shell; 301. Oil filling hole; 4. Bearing; 501. Pin; 502. First insertion hole; 503. Second insertion hole. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] Example 1

[0028] like Figure 1-2 As shown, this utility model provides a twisting head assembly for a rotor spinning machine, including a rotating shaft 1 and a twisting head 2; the rotating shaft 1 is hollow inside, and one end of the rotating shaft 1 is provided with a yarn inlet 101; the twisting head 2 includes a connecting part 201, a yarn outlet 202 and a fixing member 203, the twisting head 2 is connected to the end of the rotating shaft 1 away from the yarn inlet 101 through the connecting part 201, the connecting part 201 is provided with a through hole 204, the fixing member 203 is provided between the connecting part 201 and the yarn outlet 202, and the two sides of the fixing member 203 are arc surfaces.

[0029] The twisting head assembly for a rotor spinning machine of this invention, after the formed fiber sliver output from the pressure zone of the roller completes initial aggregation and false twisting inside the spinning cup, is conveyed outward through the yarn outlet channel of the spinning cup and enters one end of the rotating shaft 1 of this twisting head assembly. First, the rotating shaft 1 has a hollow structure. The yarn first enters the hollow cavity of the rotating shaft through the yarn inlet 101, maintaining stable axial flow during shaft rotation, preventing entanglement and outward jump, providing a straight guiding channel for twisting. Then, when the yarn reaches the end of the rotating shaft away from the yarn inlet 101, the yarn passes through the through hole 204 on the connecting part 201 of the twisting head 2. The through hole 204 defines the yarn's path in terms of size and position, forming a fixed passing point for the yarn, thus constructing a twist resistance point similar to the "first fixed end" in ring spinning, to achieve effective return of twist to the rear of the yarn. At the same time, the through hole 204 prevents the yarn from lateral swaying at high speeds, ensuring stable yarn passage. Next, after passing through the through hole 204, the yarn further passes through the outer arc-shaped guide surface of the fixing member 203, where a small amount of frictional damping is applied to the yarn, causing the yarn to form a slightly clamped, controlled yarn passing state, thus simulating the "second fixed end" gripping effect of ring-spun yarn at the spindle tube. The through hole 204 and the fixing member 203 together define a stable twisting zone, preventing the yarn from shifting or slipping within this zone, which is conducive to the full transfer of twist energy. When the shaft 1 and the twisting head 2 rotate at high speed as a whole, the yarn is subjected to a stable mechanical twisting force within the aforementioned fixed zone, causing the yarn to acquire secondary twist before leaving the yarn exit 202. This twisting is a true mechanical twist, rather than the free-end airflow twist of traditional rotor spinning, so the twist is more concentrated and uniform, and the cohesion between fibers is significantly enhanced. Finally, the yarn is output from the yarn exit 202 and enters the downstream mechanism.

[0030] Through the aforementioned structure and operation, the twisting head assembly for rotor spinning machines provided by this invention produces high yarn yield while simultaneously improving yarn strength and stability, significantly expanding the suitable spinning range of rotor spinning machines. The capacity increase is particularly significant in the production of yarns below 40 count, while substantially reducing the required production workshop area.

[0031] Furthermore, in another embodiment, a housing 3 is fitted on the outside of the rotating shaft 1. The housing 3 is rotatably connected to the rotating shaft 1 and can form an independent protective layer when the rotating shaft 1 is running at high speed. On the one hand, it reduces the wear caused by external dust and fiber debris entering the interior, and on the other hand, it prevents the operator from accidentally touching the high-speed rotating shaft 1, thereby improving the safety and reliability of the whole machine.

[0032] Furthermore, in another embodiment, a bearing 4 is provided between the rotating shaft 1 and the outer casing 3. There are two bearings 4, each located on the inner side of one end of the outer casing 3. Arranging a pair of bearings between the rotating shaft 1 and the outer casing 3, and respectively located on the inner side of one end of the outer casing, forms a stable double-support structure, significantly improving the coaxiality and operational smoothness of the rotating shaft 1. Simultaneously, it effectively reduces rotational friction resistance, decreases vibration and noise during the operation of the twisting head 2, and further improves spinning quality and the lifespan of the device.

[0033] Furthermore, in another embodiment, the housing 3 is provided with an oiling hole 301 on its side wall. The oiling hole 301 facilitates lubrication and maintenance, extends the life of the bearing 4, reduces wear and noise, and improves the durability of the equipment.

[0034] Furthermore, in another embodiment, the twisting head 2 is provided with through grooves 205 on both sides of the curved surface near the fixing member 203. The through grooves 205 penetrate the twisting head 2, and the fixing member 203 is located inside the through grooves 205. The through grooves not only facilitate the operator to observe the yarn condition and adjust or maintain the fixing member 203, but also prevent the yarn from contacting the inner wall of the twisting head 2 and causing wear when it passes through the outer curved guide surface of the fixing member 203.

[0035] Furthermore, in another embodiment, the distance between the two arc surfaces of the fixing member 203 is greater than the diameter of the through hole 204, and the distance between the two arc surfaces of the fixing member 203 is greater than the inner diameter of the yarn outlet 202. This ensures that the contact area between the yarn and the arc surface of the fixing member 203 after passing through the through hole 204 can form a gripping end, and also avoids jamming, squeezing, or excessive friction due to insufficient guide gap; at the same time, it can maintain a smooth yarn running path, avoid uneven twisting or yarn breakage due to local constraint, and improve the stability of the entire twisting process and the yarn quality.

[0036] Furthermore, in another embodiment, the twisting head 2 is detachably fixed to the rotating shaft 1 for easy installation, replacement, and maintenance. Detachability can be achieved through a pin connection, threaded connection, or snap-fit ​​connection; fixing means that the connection does not allow for relative movement.

[0037] In this embodiment, preferably, the twisting head 2 is detachably connected to the rotating shaft 1 via a pin 501. The connecting portion 201 of the twisting head 2 is provided with a first insertion hole 502, and the rotating shaft 1 is correspondingly provided with a second insertion hole 503. The pin 501 passes through the first insertion hole 502 and extends into the second insertion hole 503, facilitating disassembly and maintenance, and further improving the stability of the twisting head 2. The material of the twisting head 2 in this application is preferably ceramic. Compared with other complex connection methods, such as threaded connections, which require machining threads on ceramic parts and have a higher probability of defects, the machining process of the first insertion hole 502 is relatively simple, causing less damage to the ceramic parts, and has a higher material utilization rate, avoiding a large amount of material waste. It is also easy to maintain and replace. In addition, the pin connection has a certain adjustment space. The gap of the connection can be adjusted by selecting a suitable pin size or adding a shim between the pin and the hole, compensating for machining errors and ensuring the reliability of the connection.

[0038] It is worth noting that the pin 501 in this embodiment can be made of metal or formed by injection molding. In this embodiment, the pin 501 is preferably formed by injecting adhesive into the first socket 502 and the second socket 503 and then curing it. Preferably, the material used for injection molding is epoxy resin.

[0039] Optionally, the twisting head 2 can be fixedly connected to the rotating shaft by adhesive bonding, or it can be connected by a pin connection combined with adhesive to improve the strength and sealing of the connection.

[0040] Working principle:

[0041] The formed fiber sliver output from the pressure zone of the roller is initially gathered inside the spinning cup and then conveyed outward along the yarn exit channel after forming a false twist inside the spinning cup. When the yarn enters this component, it first enters the hollow cavity inside through the yarn inlet 101 at one end of the rotating shaft 1. When the yarn reaches the end of the rotating shaft away from the yarn inlet, it enters the connecting part 201 of the twisting head 2 and passes through the through hole 204 thereon. The through hole 204 limits the yarn passing point, so that the yarn forms a twist resistance point at this point. After the yarn passes through the through hole 204, it further passes through the outer arc surface of the fixing member 203 set between the connecting part and the yarn exit 202. The arc-shaped guide surface of the fixing member applies moderate frictional damping to the yarn, so that the yarn forms a slightly controlled clamping state at this point, which is equivalent to the "second fixed end" in ring spinning. The through-hole 204 and the fixing element 203 together form a stable twisting zone, keeping the yarn on a fixed path within this zone, preventing slippage or displacement. This facilitates the accumulation and transmission of twist within the defined area, achieving true and stable mechanical secondary twisting. When the shaft 1 and twisting head 2 rotate at high speed, the yarn is subjected to mechanical twisting force applied by the rotating system within the aforementioned fixed zone, ensuring that the yarn achieves a uniform and stable true twist before reaching the yarn exit 202, thereby significantly improving fiber cohesion and yarn strength. Finally, the twisted yarn is output from the yarn exit 202 and enters the downstream drafting or winding mechanism. Through the above structural combination, this twisting head assembly significantly improves the dryness, strength, and stability of rotor-spun yarns, resulting in high output and an expanded range of suitable spinning applications. Especially in the production of yarns below 40 count, it can significantly increase production capacity and reduce equipment footprint, demonstrating significant value in improving economic efficiency.

[0042] Unless otherwise specified, in this utility model, terms such as "length," "width," "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 utility model and simplifying the description, and do not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0043] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A twisting head assembly for a rotor spinning machine, characterized in that, include: A rotating shaft (1) and a twisting head (2); the rotating shaft (1) is hollow inside, and one end of the rotating shaft (1) is provided with a yarn inlet (101); the twisting head (2) includes a connecting part (201), a yarn outlet (202) and a fixing member (203). The twisting head (2) is connected to the end of the rotating shaft (1) away from the yarn inlet (101) through the connecting part (201). The connecting part (201) is provided with a through hole (204). The fixing member (203) is located between the connecting part (201) and the yarn outlet (202). The two sides of the fixing member (203) are arc surfaces.

2. The twisting head assembly for a rotor spinning machine according to claim 1, characterized in that: The twisting head (2) has a through groove (205) on both sides of the arc surface near the fixing member (203). The through groove (205) passes through the twisting head (2), and the fixing member (203) is located inside the through groove (205).

3. The twisting head assembly for a rotor spinning machine according to claim 2, characterized in that: The distance between the two arc surfaces of the fixing member (203) is greater than the diameter of the through hole (204), and the distance between the two arc surfaces of the fixing member (203) is greater than the inner diameter of the yarn outlet (202).

4. The twisting head assembly for a rotor spinning machine according to claim 1, characterized in that: The rotating shaft (1) is fitted with a housing (3) on its outer side, and the housing (3) is rotatably connected to the rotating shaft (1).

5. The twisting head assembly for a rotor spinning machine according to claim 4, characterized in that: A bearing (4) is provided between the rotating shaft (1) and the outer shell (3). There are two bearings (4) and they are respectively located on the inner side of both ends of the outer shell (3).

6. The twisting head assembly for a rotor spinning machine according to claim 5, characterized in that: The outer casing (3) has an oil filling hole (301) on its side wall.

7. The twisting head assembly for a rotor spinning machine according to claim 1, characterized in that: The twisting head (2) is detachably fixed to the rotating shaft (1).

8. The twisting head assembly for a rotor spinning machine according to claim 7, characterized in that: The twisting head (2) is detachably connected to the rotating shaft (1) via a pin (501). The connecting part (201) of the twisting head (2) is provided with a first insertion hole (502), and the rotating shaft (1) is provided with a corresponding second insertion hole (503). The pin (501) passes through the first insertion hole (502) and extends into the second insertion hole (503).

9. The twisting head assembly for a rotor spinning machine according to claim 8, characterized in that: The pin (501) is formed by injecting adhesive into the first socket (502) and the second socket (503) and then curing it.

10. The twisting head assembly for a rotor spinning machine according to claim 1, characterized in that: The twisting head (2) is made of ceramic material.

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