CN113174662A

CN113174662A - Nozzle block, air spinning device and air spinning machine

Info

Publication number: CN113174662A
Application number: CN202110001795.8A
Authority: CN
Inventors: 庄田裕一
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2020-01-27
Filing date: 2021-01-04
Publication date: 2021-07-27
Anticipated expiration: 2041-01-04
Also published as: CN113174662B; JP2021116495A

Abstract

The invention provides a nozzle block, an air spinning device and an air spinning machine. The nozzle block is provided with a main body part (111) having a swirling chamber (117) and a spinning nozzle (123). The spinning nozzle (123) is provided with a linear section (151) and a cross-section changing section (153). The linear portion (151) has a discharge port (125) located at one end in the axial direction of the nozzle and facing the swirl chamber (117), and extends in the axial direction of the spinning nozzle (123). The cross-section changing portion (153) is connected to the linear portion (151) on the opposite side of the discharge port (125) in the axial direction of the spinning nozzle (123). The diameter of the cross-section changing section (153) expands from the connecting section (155) between the linear section (151) and the cross-section changing section (153) toward the other end in the axial direction of the spinning nozzle (123). The length (L2) of the straight section (151) in the axial direction of the spinning nozzle (123) is 0.4mm to 4 mm. The opening angle (theta) of the cross-section changing portion (153) is 5 degrees to 90 degrees.

Description

Nozzle block, air spinning device and air spinning machine

Technical Field

The invention relates to a nozzle block, an air spinning device and an air spinning machine.

Background

Conventionally, a nozzle block is known which is applied to an air spinning device for generating a yarn by applying a whirling airflow to a fiber bundle in an air spinning machine. Patent document 1 and patent document 2 disclose such a nozzle block.

In the structure of japanese unexamined patent publication No. 6-10372 (patent document 1), the spinning device is composed of a nozzle block, a guide member support body, and a spindle (spindle). In this spinning device, a portion of the nozzle block covering the vicinity of the inlet of the hollow guide shaft body becomes a hollow chamber. The nozzle block is formed with nozzles. After the compressed air flows into the air accumulating part, the compressed air is ejected from the nozzle into the hollow chamber, and a high-speed swirling airflow is generated near the inlet of the hollow guide shaft. The nozzle is formed in a laval nozzle shape with an expanded inlet and outlet.

In the structure of japanese unexamined patent publication No. 7-2472 (patent document 2), the spinning device is constituted by a nozzle block having nozzles formed therein in the same manner as the nozzle block of patent document 1. In the nozzle block, the nozzle has a1 st straight line portion located on the air reservoir side in the axial direction and a2 nd straight line portion located on the hollow chamber side in the axial direction. The diameter of the 1 st straight line part is set larger than that of the 2 nd straight line part. The 1 st and 2 nd straight line parts are connected to each other so as to form a step therebetween.

In the structure of patent document 1, the nozzle is formed in a laval nozzle shape, and therefore, the nozzle is difficult to manufacture. In the structure of patent document 2, a step is present in the middle portion in the axial direction of the nozzle, and the pressure loss with respect to the air passing through the nozzle becomes large. Therefore, in order to realize high-speed spinning, it is necessary to separately adopt a means of increasing the air pressure of the compressed air supplied to the nozzle.

Disclosure of Invention

The invention aims to make the nozzle easy to manufacture and realize high-speed spinning simply by the nozzle.

According to a1 st aspect of the present invention, there is provided a nozzle block of the following structure. That is, the nozzle block is applied to an air spinning device that generates a yarn by applying a whirling airflow to a fiber bundle. The nozzle block includes a main body portion and a fiber guide portion. The main body portion has a swirl chamber. The fiber guide portion is disposed with respect to the body portion. The main body is formed with a nozzle through which air ejected into the swirl chamber passes. The fiber guide portion guides the fiber bundle toward the swirl chamber. The nozzle includes a linear portion and a cross-sectional changing portion. The linear portion has a discharge port located at one end portion in the axial direction of the nozzle and facing the swirl chamber, and is provided so as to linearly extend in the axial direction of the nozzle. The cross-sectional changing portion is connected to the linear portion on a side opposite to the ejection port in an axial direction of the nozzle. The diameter of the cross-sectional changing portion is enlarged from a connecting portion between the straight portion and the cross-sectional changing portion toward the other end portion side in the axial direction of the nozzle. The length of the straight portion in the axial direction of the nozzle is 0.4mm to 4 mm. The opening angle of the cross-section changing portion is 5 degrees or more and 90 degrees or less.

This can reduce pressure loss with respect to the air passing through the nozzle. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the nozzle. Further, since the nozzle has the straight portion, the nozzle can be easily manufactured.

In the nozzle block, the length of the straight portion in the axial direction of the nozzle is preferably 0.4mm or more and 1mm or less.

This makes it possible to eject air from the ejection port to the swirl chamber while sufficiently increasing the flow velocity of the air.

In the nozzle block, it is preferable that an opening angle of the cross-sectional changing portion is 10 degrees or more and 20 degrees or less.

This can increase the flow velocity of the air introduced into the linear portion.

The nozzle block preferably has the following structure. That is, the cross-section changing portion has an inlet. The inlet is located at the other end in the axial direction of the nozzle, and is introduced with air supplied to the nozzle. The cross-sectional changing portion is formed in a tapered shape having a passage cross section that is largest at the introduction port.

Thus, the nozzle can be formed smaller in the main body portion than a conventional nozzle formed of two linear portions having different diameters, and a decrease in the strength of the main body portion due to the installation of the nozzle can be avoided.

The nozzle block preferably has the following structure. That is, the nozzle further includes the 2 nd straight line portion. The 2 nd straight portion has a passage cross section larger than that of the straight portion, and is connected to the cross-sectional changing portion on the opposite side of the straight portion with respect to the cross-sectional changing portion. The cross-section changing portion is formed in a tapered shape or an arc shape.

This allows air to flow well even in the cross-sectional change portion.

In the nozzle block, it is preferable that a length of the cross-sectional change portion in an axial direction of the nozzle is 0.6mm or more and 4mm or less.

This allows air to flow favorably toward the discharge port in the nozzle.

The nozzle block preferably has the following structure. That is, the number of the nozzles is 3 to 6. The diameter of the discharge port is 0.4mm to 0.8 mm.

Thus, the air discharged from the discharge port of one nozzle collides with the air discharged from the discharge ports of the other nozzles, and a swirling flow is generated also at a position upstream of the discharge ports in the fiber traveling direction. Therefore, the swirling airflow along the inner wall surface of the swirling chamber can be generated over a wide range. In addition, the turbulence of the swirling airflow can be reduced by preventing the number of nozzles from being excessive.

In the nozzle block, the main body portion is preferably made of ceramic or a metal molded product to which a coating is applied.

This can sufficiently secure the strength of the main body having the nozzle.

In the nozzle block, it is preferable that the length of the linear portion is a distance in the axial direction of the nozzle between a point closest to an upstream side end of the linear portion in an opening profile of the ejection port and the upstream side end of the linear portion.

According to the invention of claim 2, there is provided an air spinning device having the following configuration. That is, the air spinning device includes the nozzle block and a hollow guide shaft body. The fiber bundle guided from the nozzle block passes through the hollow guide shaft body.

Thus, in the air spinning device, the pressure loss of the air passing through the nozzle can be reduced. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the nozzle. In addition, in the nozzle, the existence of the straight portion can simplify the nozzle manufacturing and shorten the length of the tapered portion. Therefore, a nozzle having a desired accuracy can be easily manufactured.

According to the 3 rd aspect of the present invention, there is provided the air spinning machine of the following construction. That is, the air spinning machine includes the air spinning device, the yarn drawing device, and the winding device. The yarn drawing device draws the yarn from the air spinning device. The winding device winds the yarn from the yarn drawing device to form a package.

Thus, in the air spinning device of the air spinning machine, the pressure loss of the air passing through the nozzle can be reduced. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the nozzle. As a result, the package forming speed of the air spinning machine can be increased.

Drawings

Fig. 1 is a front view showing an overall configuration of an air spinning machine including a spinning unit having an air spinning device including a nozzle block according to embodiment 1 of the present invention.

Fig. 2 is a side view showing the spinning unit and the yarn joining carriage.

Fig. 3 is a sectional view showing the structure of the air spinning device.

Fig. 4 is a schematic cross-sectional view of the air spinning device as viewed in the axial direction.

Fig. 5 is a cross-sectional view of the spinning nozzle and its vicinity in the case where the nozzle block is cut by a plane including the axial center of the spinning nozzle.

Fig. 6 is a cross-sectional view showing a modification of the spinning nozzle.

Fig. 7 is a cross-sectional view of the spinning nozzle and its vicinity in the case where the nozzle block is cut by a plane including the axial center of the spinning nozzle in embodiment 2 of the present invention.

Fig. 8 is a cross-sectional view showing a modification of the spinning nozzle.

Detailed Description

Next, an air spinning machine 1 including an air spinning device 23 including a nozzle block 101 according to embodiment 1 of the present invention will be described with reference to fig. 1 and 2.

As shown in fig. 1, the air spinning machine 1 includes a blower case 3, a prime mover case 5, a plurality of spinning units 7, and a yarn joining cart 9. The plurality of spinning units 7 are arranged in parallel in a predetermined direction.

A blower 11 and the like that function as a negative pressure source are disposed in the blower case 3.

The prime mover casing 5 is provided with a drive source (not shown), a central control unit 13, a display unit 15, and an operation unit 17. The drive source provided in the prime mover case 5 includes a motor commonly used by the plurality of spinning units 7.

The central control device 13 centrally manages and controls the respective parts of the air spinning machine 1. As shown in fig. 2, the central control device 13 is connected to a unit control unit 19 provided in each spinning unit 7 via a signal line, not shown. In the present embodiment, each spinning unit 7 is provided with the unit control section 19, but a predetermined number (for example, two or four) of spinning units 7 may share one unit control section 19.

The display unit 15 can display the setting contents for the spinning units 7, information on the state of each spinning unit 7, and the like.

Each spinning unit 7 mainly includes a draft device 21, an air spinning device 23, a yarn accumulating device (yarn drawing device) 25, and a winding device 27, which are arranged in this order from upstream to downstream. The "upstream" and the "downstream" herein refer to upstream and downstream in the traveling direction of the sliver 32, the fiber bundle 34, and the spun yarn 30 when the spun yarn (yarn) 30 is wound.

The draft device 21 is provided in the vicinity of the upper end of a frame 36 provided in the air spinning machine 1. As shown in fig. 2, the draft device 21 includes four draft roller pairs. The four draft roller pairs are a rear roller pair 41, a third roller pair 43, a middle roller pair 45, and a front roller pair 47 arranged in this order from the upstream to the downstream. In the middle roller pair 45, a tangential belt 49 is provided for each roller.

The draft device 21 generates a fiber bundle 34 by feeding a sliver 32 supplied from a can (not shown) between rollers of each draft roller pair to elongate (draft) the sliver to a predetermined fiber amount (or thickness). The fiber bundle 34 generated by the draft device 21 is supplied to the air spinning device 23. Hereinafter, a portion where the front roller pair 47 nips the fiber bundle 34 is referred to as a nip.

The air spinning device 23 applies a swirling airflow to the fiber bundle 34 generated by the draft device 21 to twist the fiber bundle, thereby generating a spun yarn 30. The air spinning device 23 will be described in detail later.

The yarn accumulating device 25 draws out the spun yarn 30 produced by the air spinning device 23. As shown in fig. 2, the yarn accumulating device 25 includes a yarn accumulating roller 53 and a motor 55.

The yarn accumulating roller 53 is rotationally driven by a motor 55. The yarn accumulating roller 53 winds the spun yarn 30 around the outer peripheral surface thereof and temporarily accumulates the spun yarn. The yarn accumulating roller 53 is rotated at a predetermined rotational speed while the spun yarn 30 is wound around the outer peripheral surface thereof, and thereby the spun yarn 30 is drawn out from the air spinning device 23 at a predetermined speed.

In this way, the yarn accumulating device 25 can temporarily accumulate the spun yarn 30 on the outer peripheral surface of the yarn accumulating roller 53, and thus functions as a buffer for the spun yarn 30. This eliminates a problem (e.g., loosening of the spun yarn 30) caused by a discrepancy in the spinning speed and the winding speed (the traveling speed of the spun yarn 30 wound into the package 73 described later) in the air spinning device 23 for some reason.

A yarn monitoring device 59 is provided between the air spinning device 23 and the yarn accumulating device 25. The spun yarn 30 produced by the air spinning device 23 passes through the yarn monitoring device 59 before being accumulated by the yarn accumulating device 25.

The yarn monitoring device 59 monitors the quality of the advancing spun yarn 30 by an optical sensor, and detects a yarn defect included in the spun yarn 30. As the yarn defect, for example, an abnormality in the thickness of the spun yarn 30, foreign matter contained in the spun yarn 30, or the like can be considered. When detecting a yarn defect in the spun yarn 30, the yarn monitoring device 59 transmits a yarn defect detection signal to the unit control section 19. The yarn monitoring device 59 may monitor the quality of the spun yarn 30 using, for example, an electrostatic capacitance sensor instead of the optical sensor. Instead of or in addition to these examples, the yarn monitoring device 59 may be configured to measure the tension of the spun yarn 30 as the quality of the spun yarn 30.

Upon receiving the yarn defect detection signal from the yarn monitoring device 59, the unit control section 19 stops the driving of the air spinning device 23 and/or the draft device 21 to cut the spun yarn 30. That is, the air spinning device 23 functions as a cutting section that cuts the spun yarn 30 when the yarn monitoring device 59 detects a yarn defect. The spinning unit 7 may include a cutter for cutting the spun yarn 30.

The winding device 27 includes a cradle arm 61, a winding drum 63, and a traverse guide 65. The cradle arm 61 is supported swingably about a support shaft 67, and rotatably supports a bobbin 71 (i.e., a package 73) for winding the spun yarn 30. The winding drum 63 rotates in the winding direction by rotating while being in contact with the outer peripheral surface of the bobbin 71 or the package 73. The winding device 27 drives the winding drum 63 by an electric motor, not shown, while reciprocating the traverse guide 65 by a driving mechanism, not shown. Thereby, the winding device 27 winds the spun yarn 30 into the package 73 while traversing the spun yarn 30.

As shown in fig. 1, a rail 81 is arranged on the frame 36 of the air spinning machine 1 along the arrangement direction of the plurality of spinning units 7. The yarn joining carriage 9 is configured to be able to travel on the rail 81. Thereby, the yarn joining cart 9 can move relative to the plurality of spinning units 7. The yarn joining cart 9 travels to the spinning unit 7 where yarn breakage or yarn cutting has occurred, and performs a yarn joining operation for the spinning unit 7.

As shown in fig. 1, the yarn joining cart 9 includes a traveling wheel 83, a yarn joining device 85, a suction pipe 87, and a suction nozzle 89. The yarn joining cart 9 further includes a cart control unit 91 shown in fig. 2.

The suction pipe 87 can catch the spun yarn 30 produced by the air spinning device 23 at the time of the discharge spinning. Specifically, the suction pipe 87 generates a suction airflow at the tip thereof, and thereby can suck and catch the spun yarn 30 fed from the air spinning device 23. The suction nozzle 89 can catch the spun yarn 30 wound around the package 73 of the winding device 27. Specifically, the suction nozzle 89 generates a suction airflow at its leading end, and thereby can suck and catch the spun yarn 30 from the package 73 supported by the winding device 27. The suction pipe 87 and the suction nozzle 89 guide the spun yarn 30 to a position where the spun yarn 30 can be guided to the yarn joining device 85 by rotating in a state where the spun yarn 30 is caught.

The yarn joining device 85 joins the spun yarn 30 from the air spinning device 23 guided by the suction pipe 87 and the spun yarn 30 from the package 73 guided by the suction nozzle 89. In the present embodiment, the yarn joining device 85 is a twisting device that twists yarn ends to each other by a swirling air flow. The yarn splicing device 85 is not limited to the splicing device described above, and for example, a mechanical knotter or the like may be used. The yarn joining cart 9 may connect the spun yarn 30 by piecing without providing the yarn joining device 85. That is, the yarn joining cart 9 may draw out the spun yarn 30 from the package 73, and after reversing the drawn yarn to the air spinning device 23, start the drafting operation by the drafting device 21 and the spinning operation by the air spinning device 23, thereby bringing the spun yarn 30 into the continuous state again.

The carriage control Unit 91 (see fig. 2) is configured as a known computer including a Central Processing Unit (CPU), a Read Only Memory (ROM), a Random Access Memory (RAM), and the like, which are not shown. The carriage control unit 91 controls the operation of each unit provided in the yarn joining carriage 9, thereby controlling the yarn joining operation performed by the yarn joining carriage 9.

Next, the structure of the air spinning device 23 will be described in detail with reference to fig. 3 and 4.

The air spinning device 23 generates a spun yarn 30 using the fiber bundle 34 supplied from the draft device 21. As shown in fig. 3, the air spinning device 23 includes a nozzle block 101 and a hollow guide shaft body 103. The nozzle block 101 has a main body portion 111 and a fiber guide portion 113.

In the nozzle block 101, the fiber guide 113 guides the fiber bundle 34 drafted by the draft device 21 toward the inside of the main body 111. Specifically, the fiber guide 113 includes the 1 st passage 115 through which the fiber bundle 34 can pass. The 1 st passage 115 is provided so as to extend in the axial direction of the fiber guide portion 113 (the fiber traveling direction in which the fiber bundle 34 travels). The downstream end of the 1 st passage 115 is connected to the swirl chamber 117. The 1 st passage 115 faces the front roller pair 47 of the draft device 21 on the upstream end side. When the fiber bundle 34 generated by the draft device 21 is supplied to the air spinning device 23, the fiber guide portion 113 passes through the 1 st passage 115 and is guided to the whirling chamber 117.

A needle member 107 is attached to the fiber guide portion 113. The fiber bundle 34 drafted by the draft device 21 is guided by passing through the 1 st passage 115 and then being wound around the needle member 107. The needle-like member 107 is provided so as to extend in the axial direction of the fiber guide portion 113, and is disposed so as to protrude from a flat surface 119 formed at the downstream end of the fiber guide portion 113 toward the swirl chamber 117. A downstream end (outlet) of the 1 st passage 115 is disposed on the flat surface 119. The fiber guide 113 may not include the needle member 107.

The main body 111 is disposed downstream of the fiber guide portion 113. The main body 111 has a hollow portion. The fiber bundle 34 passes through the hollow portion. The main body 111 is formed of a ceramic or metal molded product (e.g., aluminum die cast). When the main body 111 (including the wall surface of the spinning nozzle 123 described later) is a metal molded product, a predetermined coating (for example, a coating based on a diamond-like carbon film or a ceramic coating) is preferably applied to the main body 111.

A swirl chamber 117, which is a cylindrical space, is formed inside the body 111. That is, as shown in fig. 4, the swirl chamber 117 is formed so that a cross section cut by a plane perpendicular to the axial direction of the nozzle block 101 is circular. The body 111 has an inner wall surface 121, and the inner wall surface 121 is a curved surface along the circumferential direction of the swirl chamber 117. The swirl chamber 117 is formed of a space surrounded by the inner wall surface 121 of the body 111, the flat surface 119 of the fiber guide portion 113 shown in fig. 3, and a tapered surface of a tapered portion 131 of the hollow guide shaft body 103, which will be described later. The axis of the swirl chamber 117 coincides with the axis of the nozzle block 101 and the axis of the hollow guide shaft body 103.

The main body 111 is provided with a spinning nozzle (nozzle) 123. The air spinning device 23 can eject air (compressed air) having passed through the spinning nozzle 123 from the spinning nozzle 123 into the swirl chamber 117. The spinning nozzle 123 is formed as a through hole penetrating the main body 111 and extends in a direction inclined with respect to the axial center of the nozzle block 101. A discharge port 125 for discharging air into the swirling chamber 117 is provided at one end in the longitudinal direction of the spinning nozzle 123. The ejection port 125 opens toward the swirl chamber 117. An inlet 127 into which air supplied to the spinning nozzle 123 is introduced is provided at the other end portion in the longitudinal direction of the spinning nozzle 123. The inlet 127 is connected to an air supply unit 129 shown in fig. 3. The air supply unit 129 is connected to a compressed air source (not shown) and is supplied with air (compressed air) from the compressed air source. Thereby, the air spinning device 23 discharges the compressed air from the spinning nozzle 123 into the whirling chamber 117, and makes the whirling airflow act on the fiber bundle 34 in the whirling chamber 117.

The hollow guide shaft body 103 is disposed downstream of the nozzle block 101. The hollow guide shaft body 103 is formed in a conical shape extending along the fiber traveling direction in which the fiber bundle 34 travels. The upstream end of the hollow guide shaft body 103 is disposed so as to face the fiber guide portion 113 of the nozzle block 101. A conical tapered portion 131 is formed on the outer peripheral side of the upstream end of the hollow guide shaft body 103. The tapered portion 131 is disposed so as to face the swirl chamber 117, and is formed so that the outer diameter decreases from the downstream side toward the upstream side.

The hollow guide shaft body 103 has a2 nd passage 133 through which the fiber bundle 34 guided from the 1 st passage 115 in the nozzle block 101 passes. The 2 nd passage 133 is provided so as to extend in the axial direction (fiber running direction) of the hollow guide shaft body 103. The 2 nd passage 133 guides the fiber bundle 34 to the downstream side, and sends it as the spun yarn 30 from a downstream end (outlet) not shown to the outside of the air spinning device 23. The upstream end of the 2 nd passage 133 is connected to the swirl chamber 117.

The fiber bundle 34 is composed of a plurality of fibers. Some of the fibers included in the fiber bundle 34 are continuous between the nip point of the front roller pair 47 and the hollow guide shaft body 103. A part of the fibers in this state is referred to as core fibers 34 a. The other part of the fibers included in the fiber bundle 34 is not continuous between the nip point of the front roller pair 47 and the hollow guide shaft body 103. The downstream end of such fibers is twisted into the core fiber 34a, but the upstream end is a free end. The free end of each fiber introduced into the air spinning device 23 flows downstream while rotating by a swirling airflow generated by the compressed air discharged from the spinning nozzle 123. In this way, the free ends (upstream ends) of the fibers flow toward the downstream side, and the direction of the free ends is "reversed" and directed toward the downstream side (the lower side in fig. 3). Since the reversed fiber is wound around the core fiber 34a as described later, the reversed fiber is referred to as a wound fiber 34 b.

The free ends of the wound fibers 34b are subjected to a swirling airflow that flows spirally around the hollow guide shaft body 103 in the swirling chamber 117. Thereby, the wound fiber 34b rotates around the outer peripheral surface (tapered surface) of the tapered portion 131 of the hollow guide shaft body 103 along the outer peripheral surface. Thereby, the winding fiber 34b is gradually wound around the core fiber 34 a.

The core fiber 34a is twisted by the rotating winding fiber 34 b. The winding fiber 34b is wound around the core fiber 34a in this way, and the core fiber 34a is further twisted to twist the winding fiber 34b into the core fiber 34a, thereby producing the spun yarn 30.

The twist of the core fiber 34a is intended to propagate upstream (the front roller pair 47 side), but the propagation is prevented by the needle member 107. Thus, the needle-like member 107 functions as a twist propagation preventing mechanism. In the case where the air spinning device 23 does not include the needle member 107, the twist propagation prevention mechanism is realized by the downstream end of the fiber guide portion 113.

A tapered surface 135 is formed on the main body portion 111 of the nozzle block 101 so as to be continuous with the downstream end of the inner wall surface 121. The tapered surface 135 expands toward the downstream side, and the diameter of the space formed by the tapered surface 135 increases toward the downstream side. By forming the tapered surface 135, a space between the body 111 and the hollow guide shaft 103 can be secured. This allows the compressed air supplied to the swirl chamber 117 to be discharged.

Next, the structure of the spinning nozzle 123 will be described in detail with reference to fig. 4 and 5. Fig. 4 shows a cross section obtained by cutting a part of the main body 111 with a plane inclined along the axis of the spinning nozzle 123. In the cross-sectional view of fig. 5 and the subsequent section, the cut surface is similarly inclined.

In the nozzle block 101, at least one spinning nozzle 123 is formed in the main body 111. In the present embodiment, as shown in fig. 4, four spinning nozzles 123 are provided in the main body 111. The four spinning nozzles 123 are arranged so that the angles between the adjacent spinning nozzles 123 in the circumferential direction of the swirl chamber 117 are uniform. Specifically, the four spinning nozzles 123 are arranged at 90 ° intervals with respect to the axial center of the swirling chamber 117.

In the case where a plurality of spinning nozzles 123 are provided as in the present embodiment, air discharged from the discharge port 125 of one spinning nozzle 123 collides with air discharged from the discharge ports 125 of the other spinning nozzles 123. Therefore, the swirling air flow can be generated also at the upstream side of the ejection port 125 in the fiber traveling direction. As a result, the swirling airflow along the inner wall surface 121 can be generated over a wide range of the swirling chamber 117. If the number of the spinning nozzles 123 is too large, the air ejected from the ejection port 125 may interfere with each other and disturb the swirling airflow. Therefore, the number of the spinning nozzles 123 is preferably 3 to 6.

The spinning nozzle 123 is disposed obliquely so as to have a spiral tangent line with the axial direction of the nozzle block 101 as an axis. The spinning nozzle 123 has a discharge port 125 at one end in the axial direction (longitudinal direction) and opens into the swirling chamber 117. The other end portion in the axial direction of the spinning nozzle 123 includes an introduction port 127 and is connected to an air supply portion 129. The spinning nozzle 123 is formed so that a cross-sectional shape cut by a plane perpendicular to the axial direction thereof is circular. Since both the discharge port 125 and the introduction port 127 are open on the cylindrical surface, the opening contour thereof has a complicated shape such as an ellipse.

As shown in fig. 5, the distance in the axial direction of the spinning nozzle 123 between the point of the opening contour of the ejection port 125 closest to the introduction port 127 and the point of the opening contour of the introduction port 127 closest to the ejection port 125 is defined as a length L1 of the spinning nozzle 123. In the present embodiment, the length L1 of the spinning nozzle 123 is 1mm to 8 mm. The length L1 of the spinning nozzle 123 is preferably 1mm to 5 mm.

In the present embodiment, as shown in fig. 4, each spinning nozzle 123 is formed so that a part thereof is along the inner wall surface 121 of the body 111. Therefore, when air is ejected from the ejection port 125 of the spinning nozzle 123, a swirling airflow along the inner wall surface 121 can be generated. When the swirling airflow along the inner wall surface 121 acts on the entangled fiber 34b in fig. 3, the entangled fiber 34b swirls along the inner wall surface 121. Therefore, the tension applied to the wound fibers 34b can be reduced while dispersing the wound fibers 34 b. Thereby, the winding fibers 34b are easily and uniformly wound around the core fibers 34 a.

As shown in fig. 5, the spinning nozzle 123 has a linear portion 151 and a cross-section changing portion (diameter changing portion) 153. In the spinning nozzle 123, the linear portion 151 is disposed on one end portion side in the axial direction where the discharge port 125 is located, and the cross-sectional changing portion 153 is disposed on the other end portion side in the axial direction where the introduction port 127 is located. Hereinafter, focusing on the air flow in the spinning nozzle 123, a side closer to the swirling chamber 117 may be referred to as a downstream side and a side farther from the swirling chamber 117 may be referred to as an upstream side in the axial direction of the spinning nozzle 123. The downstream side may be referred to as the discharge port 125 side and the upstream side may be referred to as the introduction port 127 side.

The linear portion 151 functions as an air outlet portion for the swirling chamber 117 in the spinning nozzle 123. The linear portion 151 is provided to linearly extend along the axial direction of the spinning nozzle 123. The linear portion 151 is formed as a circular hole having a circular cross-sectional shape cut by a plane perpendicular to the axial direction of the spinning nozzle 123. The diameter of the linear portion 151 is constant in the axial direction of the linear portion 151.

As shown in fig. 5, the distance in the axial direction of the spinning nozzle 123 between the closest point to the introduction port 127 in the opening contour of the ejection port 125 and the end on the upstream side of the linear portion 151 is defined as the length L2 of the linear portion 151. The length L2 of the linear section 151 is 5 to 50% of the length L1 of the spinning nozzle 123. Specifically, the length L2 of the linear portion 151 is 0.4mm to 4 mm. The length L2 of the linear portion 151 is preferably 20 to 40% of the length L1 of the spinning nozzle 123, that is, preferably 0.4mm to 1 mm.

The downstream end of the linear portion 151 is arranged to coincide with the downstream end of the spinning nozzle 123, and the discharge port 125 is provided at the downstream end. When the opening contour of the discharge port 125 is projected on a plane perpendicular to the axial direction of the spinning nozzle 123, the diameter of the contour is defined as the aperture L3 of the discharge port 125. Normally, the diameter L3 of the discharge port 125 coincides with the diameter of the linear portion 151. The diameter L3 of the discharge port 125 is 0.4mm to 0.8 mm. The diameter L3 of the discharge port 125 is preferably 0.6mm to 0.8 mm.

The cross-section changing portion 153 functions as an air inlet portion for air from the air supply portion 129 in the spinning nozzle 123. The cross-section changing portion 153 is provided so as to extend in the axial direction of the spinning nozzle 123. The cross-sectional changing portion 153 is disposed coaxially with the linear portion 151. The downstream end of the cross-section changing portion 153 is connected to the upstream end of the linear portion 151 in the axial direction of the spinning nozzle 123. Hereinafter, a portion where the cross-section changing portion 153 is connected to the linear portion 151 is referred to as a connection portion 155. In the present embodiment, the upstream end of the cross-section changing portion 153 is arranged to match the upstream end of the spinning nozzle 123, and the introduction port 127 is arranged at the end.

The cross-sectional varying portion 153 is formed so that a cross-sectional shape obtained by cutting a plane perpendicular to the axial direction thereof is circular. The cross-sectional varying portion 153 is formed so as to linearly increase in diameter from the connecting portion 155 toward the upstream side in the axial direction of the spinning nozzle 123. In the present embodiment, the cross-section changing portion 153 is formed in a tapered shape (tapered shape) in which the diameter on the upstream side is larger than the diameter on the downstream side, and the diameter gradually increases from the downstream side toward the upstream side. Therefore, the diameter of the cross-sectional varying portion 153 is largest at the upstream end of the cross-sectional varying portion 153 where the introduction port 127 is located. The opening angle (taper angle) θ of the cross-section changing portion 153 shown in fig. 5 is set to be 5 degrees to 90 degrees.

Specifically, as shown in fig. 4, a cutting plane P1 is defined, and the cutting plane P1 is an imaginary plane including both a straight line a1 perpendicular to the axial center of the nozzle block 101 and a straight line a2 corresponding to the axial center 157 of the spinning nozzle 123. When the cross-sectional profile obtained by cutting the main body 111 with the cutting plane P1 is viewed, as shown in fig. 5, virtual straight lines connecting the connecting portion 155 and the upstream end portion of the cross-sectional changing portion 153 (the portion where the introduction port 127 is located in the example of fig. 5) are inclined at a predetermined angle with respect to the axial center 157 of the spinning nozzle 123 on both sides across the axial center 157 of the spinning nozzle 123. The opening angle θ is defined as an angle formed by two imaginary straight lines. The opening angle theta is set to be 5 degrees to 90 degrees. The opening angle θ is preferably 10 degrees or more and 20 degrees or less.

As shown in fig. 6, the cross-section changing portion 153 may be provided only in the vicinity of the upstream end (the portion where the introduction port 127 is located) of the spinning nozzle 123 with a short length. In this case, the cross-section changing portion 153 is preferably formed in an R shape (circular arc shape). In fig. 6, the region of the upstream-side end of the linear portion 151 includes an inclined portion, and in this case, the length L2 of the linear portion 151 is the distance in the axial direction of the spinning nozzle 123 between the point of the opening contour of the ejection port 125 closest to the introduction port 127 and the point of the most downstream side in this region.

As described above, the nozzle block 101 of the present embodiment is applied to the air spinning device 23 that generates a yarn by causing a swirling airflow to act on the fiber bundle 34. The nozzle block 101 includes a main body 111 and a fiber guide 113. The main body 111 includes a whirling chamber 117 and a spinning nozzle 123 through which air discharged into the whirling chamber 117 passes. The fiber guide portion 113 is provided with respect to the body portion 111, and guides the fiber bundle 34 toward the swirl chamber 117. The spinning nozzle 123 includes a linear portion 151 and a cross-section changing portion 153. The linear portion 151 has a discharge port 125 located at one end in the axial direction of the spinning nozzle 123 and facing the swirl chamber 117, and is provided so as to extend in the axial direction of the spinning nozzle 123. The cross-sectional changing portion 153 is connected to the linear portion 151 on the opposite side of the discharge port 125 in the axial direction of the spinning nozzle 123. The diameter of the cross-sectional varying portion 153 is enlarged from the connecting portion 155 between the linear portion 151 and the cross-sectional varying portion 153 toward the other end portion side in the axial direction of the spinning nozzle 123. The length L2 of the linear portion 151 in the axial direction of the spinning nozzle 123 is 0.4mm to 4 mm. The opening angle θ of the cross-sectional varying portion 153 is 5 degrees or more and 90 degrees or less.

This can reduce the pressure loss of the air passing through the spinning nozzle 123. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the spinning nozzle 123, or high-speed spinning can be achieved without increasing the air pressure. Further, since the linear portion 151 is present in the spinning nozzle 123, the spinning nozzle 123 can be easily manufactured.

In the nozzle block 101 of the present embodiment, the length L2 of the linear portion 151 in the axial direction of the spinning nozzle 123 is preferably 0.4mm to 1 mm.

This makes it possible to eject air from the ejection port 125 toward the swirling chamber 117 while sufficiently increasing the flow velocity of the air.

In the nozzle block 101 of the present embodiment, the opening angle θ of the cross-section changing portion 153 is preferably 10 degrees or more and 20 degrees or less.

This can increase the flow velocity of the air introduced into the linear portion 151.

In the nozzle block 101 of the present embodiment, the cross-sectional changing portion 153 has the introduction port 127. The inlet 127 is located at the other end portion in the axial direction of the spinning nozzle 123, and is introduced with air supplied to the spinning nozzle 123. The cross-sectional varying portion 153 is formed in a tapered shape having a diameter that is the largest at the introduction port 127.

Thus, the spinning nozzle 123 can be formed smaller in the main body 111 than in the conventional nozzle formed of two linear portions having different diameters. In addition, a decrease in the strength of the main body 111 due to the formation of the spinning nozzle 123 can be avoided.

In the nozzle block 101 of the present embodiment, the length L1 of the spinning nozzle 123 in the axial direction of the spinning nozzle 123 is 1mm to 8 mm.

In the nozzle block 101 of the present embodiment, the length of the cross-section changing portion 153 in the axial direction of the spinning nozzle 123 is 0.6mm to 4 mm.

This allows the air to flow favorably toward the discharge port 125 in the spinning nozzle 123.

In the nozzle block 101 of the present embodiment, the number of the spinning nozzles 123 is 3 to 6. The diameter L3 of the discharge port 125 is 0.4mm to 0.8 mm.

Accordingly, the air discharged from the discharge port 125 of one of the spinning nozzles 123 collides with the air discharged from the discharge ports 125 of the other spinning nozzles 123, and a swirling air flow is generated also at a position on the upstream side (upper side in fig. 3) of the discharge ports 125 in the fiber traveling direction. Therefore, the swirling airflow along the inner wall surface 121 can be generated over a wide range of the swirling chamber 117. Further, the turbulence of the swirling airflow can be reduced by preventing the number of the spinning nozzles 123 from being excessive.

In the nozzle block 101 of the present embodiment, the main body 111 is made of ceramic or a metal molded product with a coating applied thereto.

This can sufficiently secure the strength of the main body 111 having the spinning nozzle 123.

In the present embodiment, the air spinning device 23 includes a nozzle block 101 and a hollow guide shaft body 103. The fiber bundle guided from the nozzle block 101 passes through the hollow guide shaft body 103.

Thus, in the air spinning device 23, the pressure loss of the air passing through the spinning nozzle 123 can be reduced. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the spinning nozzle 123, or high-speed spinning can be achieved without increasing the air pressure. In the spinning nozzle 123, the presence of the linear portion 151 makes it possible to easily produce the spinning nozzle 123.

In the present embodiment, the air spinning machine 1 includes an air spinning device 23, a yarn accumulating device 25, and a winding device 27. The yarn accumulating device 25 draws out the spun yarn 30 from the air spinning device 23. The winding device 27 winds the spun yarn 30 from the yarn accumulating device 25 to form a package 73.

Thus, in the air spinning device 23 of the air spinning machine 1, the pressure loss of the air passing through the spinning nozzle 123 can be reduced. Therefore, high-speed spinning can be achieved without increasing the air pressure of the air supplied to the spinning nozzle 123. As a result, the package 73 forming speed by the air spinning machine 1 can be increased.

Next, embodiment 2 will be explained. In the description of the present embodiment, the same or similar components as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

As shown in fig. 7, in the present embodiment, the spinning nozzle 123 includes, in addition to the straight portion 151 and the cross-section changing portion (diameter changing portion) 153, the 2 nd straight portion 161 which is a straight portion other than the straight portion 151. As described above, the cross-section changing portion 153 is formed in a tapered shape. The cross-section changing portion 153 may be formed in an arc shape. The 2 nd linear portion 161 functions as an air inlet portion of the spinning nozzle 123 for air from the air supply portion 129. The 2 nd straight line portion 161 is provided on the most upstream side (the air supply portion 129 side) in the axial direction of the spinning nozzle 123. The 2 nd straight portion 161 is disposed upstream of the spinning nozzle 123 from the cross-sectional changing portion 153. In other words, the 2 nd linear portion 161 is disposed on the opposite side of the linear portion 151 from the cross-section changing portion 153 in the axial direction of the spinning nozzle 123.

In the present embodiment, the 2 nd linear portion 161 is formed to linearly extend in the axial direction of the spinning nozzle 123. The 2 nd linear portion 161 is disposed coaxially with the linear portion 151 and the cross-sectional changing portion 153. The downstream end of the 2 nd straight line portion 161 is connected to the upstream end (the portion having the largest diameter) of the cross-sectional changing portion 153. The upstream end of the 2 nd straight portion 161 is arranged to coincide with the upstream end of the spinning nozzle 123, and the inlet 127 is arranged at this end.

The 2 nd linear portion 161 is formed as a circular hole having a circular cross-sectional shape cut by a plane perpendicular to the axial direction of the spinning nozzle 123. The diameter of the 2 nd linear portion 161 is substantially constant in the axial direction of the 2 nd linear portion 161. The 2 nd straight portion 161 has a diameter larger than that of the straight portion 151 and is substantially the same as the diameter of the other end portion (the portion having the largest diameter) in the axial direction located outermost in the cross-sectional varying portion 153.

As described above, in the present embodiment, the 2 nd linear portion 161 functioning as the air inlet portion has a diameter larger than that of the linear portion 151 functioning as the air outlet portion. The 2 nd linear portion 161 and the linear portion 151 are connected in a smooth continuous manner by the cross-sectional changing portion 153. As a result, according to the nozzle block of the present embodiment, the same effects as those of embodiment 1 can be obtained.

As shown in fig. 8, the cross-section changing portion 153 may be formed so as to increase in diameter in a curved shape such as an arc as going from the connection portion 155 to the upstream side. In the example of fig. 8, the wall surface 163 of the cross-section changing portion 153 is formed as a curved surface (curved surface bulging inward) protruding toward (inward of) the axial center 157 of the spinning nozzle 123. That is, when a cross section obtained by cutting the main body 111 with the cutting plane P1 is observed, in the cross section, the wall surface 163 is located on the axial center 157 side of the spinning nozzle 123, compared to an imaginary straight line connecting the connecting portion 155 of the cross-sectional changing portion 153 and the straight portion 151 and the connecting portion 165 of the cross-sectional changing portion 153 and the 2 nd straight portion 161. In this case, the angle formed by two virtual straight lines located on both sides of the axial center 157 of the spinning nozzle 123 is set to be 5 degrees or more and 90 degrees or less as the opening angle θ of the cross-section varying portion 153.

As described above, in the nozzle block of the present embodiment, the spinning nozzle 123 further includes the 2 nd straight line portion 161. The 2 nd linear portion 161 has a diameter larger than that of the linear portion 151, and is connected to the cross-sectional changing portion 153 on the opposite side of the linear portion 151 from the cross-sectional changing portion 153. The cross-section changing portion 153 is formed in a tapered shape (or an arc shape).

This allows air to flow satisfactorily even in the cross-sectional changing portion 153.

While the preferred embodiments of the present invention have been described above, the above configuration can be modified as follows, for example. The above embodiment can be combined with the following modifications as appropriate.

In the above embodiment, the main body 111 and the fiber guide 113 are formed as separate members in the nozzle block 101, but the main body 111 and the fiber guide 113 may be formed integrally.

In the above embodiment, the swirl chamber 117 is described as a cylindrical space. However, the swirl chamber 117 may be formed of a tapered shape of one or more stages. The parts of the air spinning device 23 are not limited to the illustrated shapes, and may be formed in appropriate shapes.

The cross-section changing portion 153 may be formed of a plurality of tapered portions that are smoothly continuous in the axial direction of the spinning nozzle 123. In this case, the opening angle of each tapered portion is set to the aforementioned opening angle θ. That is, in the cross-section changing portion 153, the opening angle θ may be changed between one end portion side and the other end portion side in the axial direction of the spinning nozzle 123.

In the above embodiment, the yarn drawing device for drawing the spun yarn 30 from the air spinning device 23 is the yarn accumulating device 25. However, the present invention is not limited to this embodiment, and the yarn drawing device may be a device including a pair of yarn drawing rollers, or may be a device including the device and a yarn accumulating device. When the spun yarn 30 is drawn out from the air spinning device 23 by the yarn drawing roller and the nip roller, a draft tube or a mechanical compensator using a suction airflow may be provided instead of the yarn accumulating device 25.

In the above embodiment, each device is arranged so that the yarn supplied from the upper side is wound up on the lower side in the height direction of the air spinning machine 1. However, each device may be arranged so that the yarn fed on the lower side is wound on the upper side.

In the air spinning machine 1, at least one of the bottom rollers of the draft device 21 and the traverse guide 65 are driven by power from each drive source of the prime mover housing 5 (i.e., are commonly driven in the plurality of spinning units 7). However, each part of the spinning unit 7 (for example, the draft device 21, the air spinning device 23, the winding device 27, and the like) may be driven independently for each spinning unit 7.

The air spinning machine 1 may not include the yarn joining cart 9, and each spinning unit 7 may include a device related to yarn joining.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

Claims

1. A nozzle block applied to an air spinning device for generating a yarn by applying a whirling airflow to a fiber bundle, the nozzle block comprising:

a main body portion having a swirl chamber; and

a fiber guide portion provided with respect to the body portion,

a nozzle through which air ejected into the swirl chamber passes is formed in the main body,

the fiber guide portion guides the fiber bundle toward the swirl chamber,

the nozzle is provided with:

a linear portion having a discharge port located at one end portion in the axial direction of the nozzle and facing the swirl chamber, and provided to extend linearly in the axial direction of the nozzle; and

a cross-sectional changing portion that is connected to the linear portion on a side opposite to the ejection port in an axial direction of the nozzle, and whose passage cross-section is enlarged from a connection portion of the cross-sectional changing portion and the linear portion toward the other end portion side in the axial direction of the nozzle,

the length of the straight portion in the axial direction of the nozzle is 0.4mm to 4mm,

the opening angle of the cross-section changing portion is 5 degrees or more and 90 degrees or less.

2. The nozzle block of claim 1,

the length of the straight portion in the axial direction of the nozzle is 0.4mm to 1 mm.

3. The nozzle block of claim 1 or 2,

the opening angle of the cross-section changing portion is 10 degrees or more and 20 degrees or less.

4. The nozzle block according to any one of claims 1 to 3,

the cross-section changing portion has an inlet port which is located at the other end portion in the axial direction of the nozzle and into which air supplied to the nozzle is introduced, and the cross-section changing portion is formed in a tapered shape in which a passage cross section becomes maximum at the inlet port.

5. The nozzle block according to any one of claims 1 to 3,

the nozzle further includes a2 nd straight portion having a passage cross section larger than that of the straight portion and connected to the cross-section changing portion on the opposite side of the straight portion from the cross-section changing portion,

the cross-section changing portion is formed in a tapered shape or an arc shape.

6. The nozzle block according to any one of claims 1 to 5,

the length of the cross-sectional change portion in the axial direction of the nozzle is 0.6mm to 4 mm.

7. The nozzle block according to any one of claims 1 to 6,

the number of the nozzles is 3 or more and 6 or less,

the diameter of the discharge port is 0.4mm to 0.8 mm.

8. The nozzle block according to any one of claims 1 to 7,

the main body is made of ceramic or a metal molded product to which a coating is applied.

9. The nozzle block according to any one of claims 1 to 8,

the length of the linear portion is a distance in the axial direction of the nozzle between a point in the opening profile of the ejection port closest to the upstream end of the linear portion and the upstream end of the linear portion.

10. An air spinning device is characterized by comprising:

a nozzle block as claimed in any one of claims 1 to 9; and

and a hollow guide shaft body through which the fiber bundle guided from the nozzle block passes.

11. An air spinning machine is characterized by comprising:

an air spinning device as recited in claim 10;

a yarn drawing device that draws the yarn from the air spinning device; and

a winding device that winds the yarn from the yarn drawing device to form a package.