Interlacer for stranded industrial yarn and method for making interlaced points on stranded industrial yarn

Abstract

The invention belongs to the technical field of spinning, and relates to an interlacer for plied industrial yarns and a method for making interlaced points on the plied industrial yarns. A tow channel, an air injection rotating device, a first compressed air channel and a second compressed air channel are arranged in the interlacer for the stranded industrial yarn, the extending direction of the tow channel is parallel to the front-back direction, the first compressed air channel is located below the tow channel, and the second compressed air channel is located above the tow channel and behind the first compressed air channel at the same time. The first compressed air channel and the second compressed air channel are arranged at intervals in the front-back direction. The interlacing device for the stranded industrial yarn is adopted in the interlacing method for the stranded industrial yarn, the stranded industrial yarn penetrates through the tow channel, and compressed air is continuously introduced into the first compressed air channel and the second compressed air channel. According to the method for making the network points on the stranded industrial yarn, the stranded yarn combining single-strand entanglement and monofilament entanglement can be formed, the high network degree and the high strength retention rate are achieved, compressed air can be saved, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a network device for twisted industrial yarns and a method for making network points for the twisted industrial yarns. Background Art

[0002] Coarse-denier polyester industrial yarn is widely used in transmission belts, road grids, flexible slings and other fields. However, since the maximum fineness of polyester industrial yarn produced by one-step method can only reach 9000D, and in actual application fields, the coarse-denier polyester industrial yarn reaches 100,000D, such products can only be produced by plying. By plying, multiple strands of industrial yarn are combined into one strand to ensure the uniform stability of the coarse-denier industrial yarn during processing and use, which is conducive to improving the overall tensile strength and load-bearing capacity of the yarn bundle and reducing the overall performance degradation caused by the breakage of a single strand. This is especially important for application scenarios that need to withstand large loads. It can be seen that plying industrial yarn has important application value.

[0003] Although the single-strand industrial yarn used for plying has good network points and single-strand cohesion, the industrial yarn after plying is prone to gaps and overlaps between single strands, which affects the cohesion of the yarn bundle and the uniformity of single-filament dispersion, is not conducive to improving the network degree, and will also cause a significant decrease in strength. Therefore, after plying, it is necessary to use a network device to impact the yarn bundle with air flow to improve the network degree and strength retention rate of the ply industrial yarn.

[0004] Conventional single-hole network devices can make the strands form a single-strand entangled structure, but it is difficult to form a single-strand entangled structure by exchanging positions between single strands. This is mainly because the fineness of the combined industrial yarn is large, there are many single strands in a bundle of yarn, and there are network nodes. It is necessary not only to accurately control the tension and speed of the network link yarn bundle, but also to control the network pressure (the strength of the network compressed air). If the network pressure used is too low, it is difficult for the combined industrial yarn to form a single-strand entangled structure, the cohesion of the yarn bundle is poor, and the single strands are easy to detach from the main body and slip during the stretching process, resulting in uneven stretching fracture and low strength retention rate; if the network pressure is too high, although the cohesion between the single strands of the combined industrial yarn is improved, under the impact of high-pressure airflow, the arrangement uniformity of the single strands decreases, which also causes strength loss, thereby affecting the strength retention rate. Therefore, the network device of the prior art cannot simultaneously improve the network degree and strength retention rate of the combined industrial yarn.

[0005] Therefore, in order to simultaneously improve the network degree and strength retention rate of the twisted industrial yarn, it is necessary to develop a twisted industrial yarn network device and a twisted industrial yarn network dot method. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a network device for twisted industrial yarn and a method for making network dots for twisted industrial yarn.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A network device for plying industrial yarns, with a yarn bundle channel and a first compressed air channel inside, the extension direction of the yarn bundle channel is parallel to the front-back direction, the first compressed air channel is located below the yarn bundle channel, and an air jet rotating device and a second compressed air channel are also provided inside;

[0009] The jet rotating device is installed at the junction of the tow channel and the first compressed air channel;

[0010] An air flow channel is provided in the jet rotating device, and the air flow channel is the only channel between the tow channel and the first compressed air channel;

[0011] The installation method of the jet rotating device satisfies that: when the tow passes through the tow channel, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left and right directions;

[0012] The jet rotating device comprises a left fixed handle, an elliptical ball, a right fixed handle, and a right positioning handle which are sequentially arranged in the left-right direction, the long axis of the elliptical ball is parallel to the left-right direction, and the air flow channel is located in the elliptical ball; the air flow channel is Y-shaped, the upper end is an air flow outlet a and an air flow outlet b, and the lower end is an air flow outlet c, and the air flow outlet a and the air flow outlet b are arranged at intervals in the left-right direction;

[0013] The inner surface of the tow channel is composed of an upper curved surface and a lower curved surface; the upper curved surface is a semicircular arc surface, and such a design is conducive to the full spreading of the tow;

[0014] The left edge of the semicircular arc surface is located just above the junction of the left fixed handle and the ellipsoidal sphere, and the right edge of the semicircular arc surface is located just above the junction of the right fixed handle and the ellipsoidal sphere;

[0015] The gap between the right edge of the semicircular arc surface and the junction of the right fixed handle and the elliptical ball extends rightward to communicate with the outside air, forming a tow inlet, and the height of the tow inlet in the up-down direction is 2-4 mm;

[0016] The second compressed air channel is located above the tow channel and at the same time behind the first compressed air channel. The first compressed air channel and the second compressed air channel are arranged at intervals in the front-to-back direction.

[0017] As the preferred technical solution:

[0018] In the network device for twisted industrial yarn as described above, the airflow outlet a, airflow outlet b and airflow outlet c are circular, the diameters of airflow outlet a and airflow outlet b are 3-4 mm, and the diameter of airflow outlet c is 5-6 mm; the center of the orthographic projection of airflow outlet c coincides with the center of the orthographic projection of the ellipsoid.

[0019] A network device for twisted industrial yarn as described above, wherein the length of the major axis of the ellipsoid is 10-15 mm, and the length of the minor axis of the ellipsoid is 6-8 mm;

[0020] The left fixing handle, the right fixing handle and the right positioning handle are all cylindrical structures, and the central axis is parallel to the left and right directions;

[0021] The diameters of the left fixing handle and the right fixing handle are the same and range from 2 to 3 mm, and the lengths of the left fixing handle and the right fixing handle are the same and range from 8 to 10 mm;

[0022] The diameter of the right positioning handle is 1.5-2 mm, and the length of the right positioning handle is 2-3 mm;

[0023] The jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2-2.0μm.

[0024] A network device for twisted industrial yarn as described above, wherein a left groove and a right groove are provided at the junction of the yarn bundle channel and the first compressed air channel inside the network device for twisted industrial yarn;

[0025] The shape of the left groove is the same as that of the left fixing handle, and the left fixing handle is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm;

[0026] The shape of the right groove is the same as the whole formed by the right fixing handle and the right positioning handle. The whole formed by the right fixing handle and the right positioning handle is embedded in the right groove, and the height of the gap between the two in the up and down direction is 0.05-0.1mm;

[0027] The surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8-1.0 μm.

[0028] As described above, the network device for twisted industrial yarn has a lower curved surface that arches upward in the front-to-back direction and arches downward in the left-to-right direction; the maximum height of the yarn bundle channel in the up-down direction is 8-12mm, and the minimum height is 6-10mm; the length of the yarn bundle channel in the front-to-back direction is 40-60mm.

[0029] In the above-mentioned network device for twisted industrial yarns, the spacing between the first compressed air channel and the second compressed air channel along the front-to-back direction is 25-30 mm.

[0030] In the above-mentioned network device for twisted industrial yarn, the extension direction of the first compressed air channel is parallel to the up-down direction, and the first compressed air channel is a cylindrical structure with a diameter of 4-6 mm;

[0031] The second compressed air channel is composed of an air intake channel, a pressure stabilizing chamber, and an injection channel which are arranged in sequence from top to bottom and connected;

[0032] The extending directions of the air inlet channel and the injection channel are both parallel to the up-down direction;

[0033] The air inlet channel is a cylindrical structure with a diameter of 5-6mm; the pressure stabilizing chamber is a cubic structure with a length of 8-10mm in the left-right direction, a length of 5-6mm in the front-back direction, and a height of 3-4mm in the up-down direction; the jet channel is a cylindrical structure with a diameter of 2-3mm and a length of 3-4mm in the up-down direction;

[0034] The number of the jet channels is 3 and they are arranged in parallel in the left and right directions, so that three airflows can be formed to impact the coarse denier yarn bundles, effectively penetrate the yarn bundles, and thus achieve the effect of loosening. The second compressed air channel constitutes the opening area of ​​the network device for the twisted industrial yarn (the jet rotating device and the first compressed air channel constitute the network area of ​​the network device for the twisted industrial yarn).

[0035] As described above, a network device for twisted industrial yarn is divided into an upper cover layer, a middle layer, and a main body layer arranged in sequence from top to bottom, the yarn bundle channel is arranged in the middle layer, the first compressed air channel is arranged in the main body layer, and the second compressed air channel is arranged in the upper cover layer and the middle layer.

[0036] The present invention also provides a method for making network dots for twisted industrial yarns, using a network device for twisted industrial yarns as described in any of the above items, passing the twisted industrial yarns through a yarn bundle channel, and continuously introducing compressed air into the first compressed air channel and the second compressed air channel.

[0037] As the preferred technical solution:

[0038] A method for making network dots of a twisted industrial yarn as described above, the specification of the twisted industrial yarn is 8000D / 768f-100000D / 9600f, the winding speed is 400-1000m / min, the winding tension is 500-5000cN, the network pressure of the first compressed air channel is 4-8bar, the network pressure of the second compressed air channel is 4-8bar, after the tow leaves the tow channel, the network degree is 10-15 pieces / meter, and the strength retention rate is 95%-98%. The biggest problem of twisted industrial yarn is that the strength retention rate of the product will decrease after twisting. The reason for the decrease in strength retention rate is that the arrangement uniformity of the monofilaments in the tow of the twisted industrial yarn will decrease, resulting in uneven force during the stretching process and a decrease in strength. The present invention improves the uniformity of the monofilaments while ensuring a high network degree, and the tow is evenly stressed during the stretching process, so the strength retention rate is improved.

[0039] The principle of the present invention is as follows:

[0040] The traditional plying network technology relies on the continuous high-pressure jet airflow from the network nozzle to impact the tow passing through the network device tow channel to form a single-strand winding structure. Due to the large fineness of the plying industrial yarn, the conventional 4-bar network pressure is difficult to blow away the tow in the network device tow channel and form an effective single-strand entanglement structure. As the network pressure increases, the number of single-strand entanglements of the plying industrial yarn increases. However, due to the excessively high network pressure, some monofilaments curl and stretch in the high-frequency turbulent vibration, forming many loops of yarn on the surface of the tow, and the uniformity of the arrangement of the monofilaments will decrease, resulting in a decrease in the tensile strength of the plying industrial yarn.

[0041] The present invention has made a special design for the structure of the network device. When the stranded industrial yarn runs in the yarn bundle channel, it is first affected by the low-pressure airflow ejected from the second compressed air channel. In this process, the single yarns in the stranded industrial yarn are blown loose and evenly, and the gaps and overlapping structures in the stranded industrial yarn are eliminated. When the stranded industrial yarn continues to run in the yarn bundle channel, it will be affected by the high-pressure airflow ejected from the first compressed air channel again. Since a jet rotating device is installed at the junction of the yarn bundle channel and the first compressed air channel, when the yarn bundle passes through the yarn bundle channel, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left and right directions. An airflow channel is provided in the jet rotating device. When the jet rotating device rotates, the airflow channel sometimes connects the yarn bundle channel and the first compressed air channel, and sometimes does not connect the yarn bundle channel and the first compressed air channel. Therefore, the high-pressure airflow is periodically sprayed onto the stranded industrial yarn, so that the stranded industrial yarn forms an effective winding structure.

[0042] The fineness of the twisted industrial yarn is large, there are many single strands in a bundle of yarns, and there are network nodes. Conventional single-hole network devices can make the yarn bundle form a single-strand entangled structure, but it is difficult to form a single-strand entangled structure by exchanging the positions between single strands. Therefore, it is necessary to blow and compress the air at both sides of the twisted industrial yarn to exchange the positions between the single strands on both sides and the single strands in the middle position to form an effective single-strand winding structure, thereby improving the cohesion and the strength retention rate of the twisted industrial yarn. To this end, the upper end of the airflow channel designed by the present invention is the airflow outlet a and the airflow outlet b, and the lower end is the airflow outlet c. In the initial state, the airflow passing through the jet rotating device is a double-strand airflow, which mainly sprays the fibers on both sides of the twisted industrial yarn. After the jet rotating device rotates 180°, the airflow passing through the jet rotating device is a single-strand airflow, which is evenly sprayed on the fibers in the twisted industrial yarn. Double airflow and single airflow are sprayed alternately on the twisted industrial yarn. The double airflow blows the fibers on both sides of the twisted industrial yarn to make the fibers on both sides vibrate and entangle. At the same time, the fibers on both sides exchange positions with the middle fibers. The single airflow evenly blows the entire bundle of yarns after the exchange of positions, and a uniform entangled structure is formed between the single fibers of the entire bundle of yarns. The alternating action of the double airflow and the single airflow can make the twisted industrial yarn form a stable single-strand entangled structure and a single-filament entangled structure, thereby improving the cohesion of the twisted industrial yarn and maintaining a high strength during use.

[0043] Beneficial effects:

[0044] (1) The network device for the twisted industrial yarn of the present invention uses a low-pressure airflow ejected through the second compressed air channel to loosen the twisted industrial yarn in advance, and then uses single and double airflows to alternately impact the yarn bundles through the port difference of the airflow channel of the jet rotating device. By changing the airflow form that impacts the yarn bundles and changing the single high-frequency vibration state, different yarn bundle jitter and entanglement forms are formed, forming a twisted yarn that combines a single-strand entangled structure and a single-filament entangled structure, thereby improving the yarn bundle cohesion and single-filament uniformity of the twisted industrial yarn, and achieving a high network degree and high strength retention rate of the yarn bundle.

[0045] (2) The method of making grid points of the present invention adopts a combined jet method of continuous jet and intermittent jet, which can save compressed air and achieve the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is the process flow chart of interlacing of twisted industrial yarn;

[0047] Figure 2 It is a side view schematic diagram of the functional areas (opening area and network area) of the network device for twisted industrial yarn of the present invention;

[0048] Figure 3 It is a top view schematic diagram of the functional areas (opening area and network area) of the network device for twisted industrial yarn of the present invention;

[0049] Figure 4 2. It is a bottom view schematic diagram of the upper cover layer of the network device for twisted industrial yarn of the present invention;

[0050] Figure 5 It is a side view schematic diagram of the upper cover layer of the network device for twisted industrial yarn of the present invention;

[0051] Figure 6 is a bottom view schematic diagram of the middle layer of the network device for twisted industrial yarn of the present invention;

[0052] Figure 7 is a schematic side view of the middle layer of the network device for twisted industrial yarns of the present invention;

[0053] Figure 8 It is a structural schematic diagram of the opening area (second compressed air channel) of the network device for twisted industrial yarn of the present invention;

[0054] Fig. 9 It is a structural schematic diagram of the network area (jet rotating device and first compressed air channel) of the network device for twisted industrial yarn of the present invention;

[0055] Fig.10It is a structural schematic diagram of the jet rotating device of the network device for twisted industrial yarn of the present invention;

[0056] Among them, 1 is the upper cover layer, 2 is the middle layer, 3 is the main layer, 4 is the jet rotating device, 5 is the tow channel, 101 is the air inlet channel, 102 is the pressure stabilizing chamber, 103 is the injection channel, 201 is the hanging channel, 301 is the first compressed air channel, 401 is the left fixed handle, 402 is the ellipsoidal sphere, 403 is the air flow outlet a, 404 is the air flow outlet c, 405 is the air flow outlet b, 406 is the right positioning handle, 407 is the right fixed handle, 408 is the air flow channel, L1 is the length of the major axis of the ellipsoidal sphere, and L2 is the length of the right positioning handle. DETAILED DESCRIPTION

[0057] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0058] The following are the relevant performance testing methods of the embodiments and comparative examples:

[0059] (1) Network degree of yarn bundle: The network degree is tested by manual needle moving method according to FZ / T 50001-2016 standard: measure a yarn bundle with a length of 1 meter, fix one end of the yarn bundle, start from the fixed end, pierce the center of the yarn bundle with a needle and slide downward. If there is a tangle and resistance in the yarn bundle, it is regarded as a network point. Then, start from the bottom of the tangle and use the same method to operate until the yarn bundle with a length of 1 meter is tested. Count the number of network points; test each yarn bundle twice, and take the average number of network points in the two tests, which is the network degree, unit: pieces / meter.

[0060] (2) Strength retention rate: The breaking strength is tested in accordance with GB / T 16604-2017, with a tensile speed of 300 mm / min and a clamping length of 250 mm. The breaking strength test equipment is a tensile tester produced by Suzhou Tuobo Machinery Co., Ltd., model TH-8201A. Strength retention rate = (breaking strength of the combined yarn / sum of the breaking strengths of the single yarns) × 100%.

[0061] Example A1

[0062] A network device for plying industrial yarns, such as Figure 2 As shown, it is divided into an upper cover layer 1, an intermediate layer 2 and a main layer 3 arranged from top to bottom;

[0063] like Figure 2~3As shown, the interior of the network device for stranded industrial yarn is provided with a tow channel 5, a first compressed air channel 301, a second compressed air channel and an air jet rotating device 4; the tow channel 5 is arranged in the middle layer 2, the first compressed air channel 301 is arranged in the main body layer 3, and the second compressed air channel is arranged in the upper cover layer 1 and the middle layer 2; the extension direction of the tow channel 5 is parallel to the front-to-back direction, the first compressed air channel 301 is located below the tow channel 5, and the second compressed air channel is located above the tow channel 5 and at the same time behind the first compressed air channel 301; the first compressed air channel 301 and the second compressed air channel are arranged at a spacing of 28mm in the front-to-back direction; the extension direction of the first compressed air channel 301 is parallel to the up-down direction, and the first compressed air channel 301 is a cylindrical structure with a diameter of 5mm;

[0064] like Figures 4 to 8 As shown, the second compressed air channel is composed of an air inlet channel 101, a pressure stabilizing chamber 102, and an injection channel 103 which are arranged in sequence from top to bottom and connected; the extension directions of the air inlet channel 101 and the injection channel 103 are parallel to the up-down direction; the air inlet channel 101 is a cylindrical structure with a diameter of 5 mm; the pressure stabilizing chamber 102 is a cubic structure with a length of 9 mm in the left-right direction, a length of 5 mm in the front-back direction, and a height of 3 mm in the up-down direction; the injection channel 103 is a cylindrical structure with a diameter of 2 mm and a length of 3 mm in the up-down direction; the number of the injection channels 103 is 3 and they are arranged in parallel in the left-right direction;

[0065] like Figures 9 and 10 As shown, the jet rotating device 4 is provided with an air flow channel 408, and the air flow channel 408 is the only channel between the tow channel 5 and the first compressed air channel 301; the jet rotating device 4 is composed of a left fixed handle 401, an elliptical ball 402, a right fixed handle 407 and a right positioning handle 406 arranged in sequence along the left and right directions, the long axis of the elliptical ball 402 is parallel to the left and right directions, and the elliptical ball 402 is provided with an air flow channel 408, and the air flow channel 408 is Y-shaped, with air flow outlets a 403 and b 405 at the upper end and air flow outlets c 404 at the lower end, and the air flow outlets a 403 and b 405 are arranged at intervals along the left and right directions; the center of the orthographic projection of the air flow outlet c 404 coincides with the center of the orthographic projection of the elliptical ball 402; the left fixed handle 401, the right fixed handle 407 and the right positioning handle 406 are all cylindrical structures, and the central axis is parallel to the left and right directions; the jet rotating device 4 is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.6μm;

[0066] like Fig.10As shown, the length L1 of the major axis of the ellipsoid 402 is 12 mm, and the length L2 of the minor axis of the ellipsoid 402 is 7 mm; the diameters of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 2 mm, and the lengths of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 9 mm; the diameter of the right positioning handle 406 is 1.8 mm, and the length L2 of the right positioning handle 406 is 2 mm; the airflow outlet a 403, the airflow outlet b 405 and the airflow outlet c 404 are circular, the diameters of the airflow outlet a 403 and the airflow outlet b 405 are 3 mm, and the diameter of the airflow outlet c 404 is 5 mm;

[0067] like Figures 9 and 10 As shown, the inner surface of the tow channel 5 is composed of an upper curved surface and a lower curved surface; the upper curved surface is a semicircular arc surface; the left edge of the semicircular arc surface is located directly above the junction of the left fixed handle 401 and the ellipsoid 402, and the right edge of the semicircular arc surface is located directly above the junction of the right fixed handle 407 and the ellipsoid 402; the gap between the right edge of the semicircular arc surface and the junction of the right fixed handle 407 and the ellipsoid 402 extends to the right to communicate with the outside air, forming a tow entrance, and the height of the tow entrance along the up-down direction is 3mm; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction; the maximum height of the tow channel 5 along the up-down direction is 10mm, and the minimum height is 8mm; the length of the tow channel 5 along the front-to-back direction is 50mm;

[0068] like Figures 9 and 10 As shown, a left groove and a right groove are provided at the junction of the tow channel 5 and the first compressed air channel 301; the shape of the left groove is the same as the left fixed handle 401, the left fixed handle 401 is embedded in the left groove, and the height of the gap between the two along the vertical direction is 0.08mm; the shape of the right groove is the same as the whole formed by the right fixed handle 407 and the right positioning handle 406, the whole formed by the right fixed handle 407 and the right positioning handle 406 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.08mm, the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.9μm, so that the jet rotating device 4 is installed at the junction of the tow channel 5 and the first compressed air channel 301;

[0069] like Figures 8 and 9 As shown, the installation method of the jet rotating device 4 satisfies: the filament bundle enters the filament bundle channel 5 through the hanging channel 201, and when the filament bundle passes through the filament bundle channel 5, it contacts the jet rotating device 4 and drives the jet rotating device 4 to rotate around the central axis parallel to the left and right directions.

[0070] Example A2

[0071] A network device for plying industrial yarns, such as Figure 2 As shown, it is divided into an upper cover layer 1, an intermediate layer 2 and a main layer 3 arranged from top to bottom;

[0072] like Figure 2~3 As shown, the interior of the network device for stranded industrial yarn is provided with a tow channel 5, a first compressed air channel 301, a second compressed air channel and an air jet rotating device 4; the tow channel 5 is arranged in the middle layer 2, the first compressed air channel 301 is arranged in the main body layer 3, and the second compressed air channel is arranged in the upper cover layer 1 and the middle layer 2; the extension direction of the tow channel 5 is parallel to the front-to-back direction, the first compressed air channel 301 is located below the tow channel 5, and the second compressed air channel is located above the tow channel 5 and at the same time behind the first compressed air channel 301; the first compressed air channel 301 and the second compressed air channel are arranged at a spacing of 30mm in the front-to-back direction; the extension direction of the first compressed air channel 301 is parallel to the up-down direction, and the first compressed air channel 301 is a cylindrical structure with a diameter of 6mm;

[0073] like Figures 4 to 8 As shown, the second compressed air channel is composed of an air inlet channel 101, a stabilizing chamber 102, and an injection channel 103 which are arranged in sequence from top to bottom and connected; the extension directions of the air inlet channel 101 and the injection channel 103 are parallel to the up-down direction; the air inlet channel 101 is a cylindrical structure with a diameter of 6 mm; the stabilizing chamber 102 is a cubic structure with a length of 10 mm in the left-right direction, a length of 6 mm in the front-back direction, and a height of 4 mm in the up-down direction; the injection channel 103 is a cylindrical structure with a diameter of 3 mm and a length of 4 mm in the up-down direction; the number of the injection channels 103 is 3 and they are arranged in parallel in the left-right direction;

[0074] like Figures 9 and 10 As shown, the jet rotating device 4 is provided with an air flow channel 408, and the air flow channel 408 is the only channel between the tow channel 5 and the first compressed air channel 301; the jet rotating device 4 is composed of a left fixed handle 401, an elliptical ball 402, a right fixed handle 407, and a right positioning handle 406 arranged in sequence along the left and right directions, the long axis of the elliptical ball 402 is parallel to the left and right directions, and an air flow channel 408 is provided in the elliptical ball 402, and the air flow channel 408 is Y-shaped, with air flow outlets a 403 and b 405 at the upper end and air flow outlets c 404 at the lower end, and the air flow outlets a 403 and b 405 are arranged at intervals along the left and right directions; the center of the orthographic projection of the air flow outlet c 404 coincides with the center of the orthographic projection of the elliptical ball 402; the left fixed handle 401, the right fixed handle 407, and the right positioning handle 406 are all cylindrical structures, and the central axes are parallel to the left and right directions; the jet rotating device 4 is a ceramic part with a smooth surface, and the surface roughness Ra value is 2.0μm;

[0075] like Fig.10As shown, the length L1 of the major axis of the ellipsoid 402 is 15 mm, and the length L2 of the minor axis of the ellipsoid 402 is 8 mm; the diameters of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 3 mm, and the lengths of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 10 mm; the diameter of the right positioning handle 406 is 2 mm, and the length L2 of the right positioning handle 406 is 3 mm; the airflow outlet a 403, the airflow outlet b 405 and the airflow outlet c 404 are circular, the diameters of the airflow outlet a 403 and the airflow outlet b 405 are 4 mm, and the diameter of the airflow outlet c 404 is 6 mm;

[0076] like Figures 9 and 10 As shown, the inner surface of the tow channel 5 is composed of an upper curved surface and a lower curved surface; the upper curved surface is a semicircular arc surface; the left edge of the semicircular arc surface is located directly above the junction of the left fixed handle 401 and the ellipsoid 402, and the right edge of the semicircular arc surface is located directly above the junction of the right fixed handle 407 and the ellipsoid 402; the gap between the right edge of the semicircular arc surface and the junction of the right fixed handle 407 and the ellipsoid 402 extends to the right to communicate with the outside air, forming a tow entrance, and the height of the tow entrance along the up-down direction is 4mm; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction; the maximum height of the tow channel 5 along the up-down direction is 12mm, and the minimum height is 10mm; the length of the tow channel 5 along the front-to-back direction is 60mm;

[0077] like Figures 9 and 10 As shown, a left groove and a right groove are provided at the junction of the tow channel 5 and the first compressed air channel 301; the shape of the left groove is the same as the left fixed handle 401, the left fixed handle 401 is embedded in the left groove, and the height of the gap between the two along the vertical direction is 0.1mm; the shape of the right groove is the same as the whole formed by the right fixed handle 407 and the right positioning handle 406, the whole formed by the right fixed handle 407 and the right positioning handle 406 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.1mm, the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 1.0μm, so that the jet rotating device 4 is installed at the junction of the tow channel 5 and the first compressed air channel 301;

[0078] like Figures 8 and 9 As shown, the installation method of the jet rotating device 4 satisfies: the filament bundle enters the filament bundle channel 5 through the hanging channel 201, and when the filament bundle passes through the filament bundle channel 5, it contacts the jet rotating device 4 and drives the jet rotating device 4 to rotate around the central axis parallel to the left and right directions.

[0079] Example A3

[0080] A network device for plying industrial yarns, such as Figure 2 As shown, it is divided into an upper cover layer 1, an intermediate layer 2 and a main layer 3 arranged from top to bottom;

[0081] like Figure 2~3 As shown, the interior of the network device for stranded industrial yarn is provided with a tow channel 5, a first compressed air channel 301, a second compressed air channel and an air jet rotating device 4; the tow channel 5 is arranged in the middle layer 2, the first compressed air channel 301 is arranged in the main body layer 3, and the second compressed air channel is arranged in the upper cover layer 1 and the middle layer 2; the extension direction of the tow channel 5 is parallel to the front-to-back direction, the first compressed air channel 301 is located below the tow channel 5, and the second compressed air channel is located above the tow channel 5 and at the same time behind the first compressed air channel 301; the first compressed air channel 301 and the second compressed air channel are arranged at a spacing of 25 mm in the front-to-back direction; the extension direction of the first compressed air channel 301 is parallel to the up-down direction, and the first compressed air channel 301 is a cylindrical structure with a diameter of 4 mm;

[0082] like Figures 4 to 8 As shown, the second compressed air channel is composed of an air inlet channel 101, a pressure stabilizing chamber 102, and an injection channel 103 which are arranged in sequence from top to bottom and connected; the extension directions of the air inlet channel 101 and the injection channel 103 are parallel to the up-down direction; the air inlet channel 101 is a cylindrical structure with a diameter of 5 mm; the pressure stabilizing chamber 102 is a cubic structure with a length of 8 mm in the left-right direction, a length of 5 mm in the front-back direction, and a height of 3 mm in the up-down direction; the injection channel 1.3 is a cylindrical structure with a diameter of 2 mm and a length of 3 mm in the up-down direction; the number of injection channels 103 is 3 and they are arranged in parallel in the left-right direction;

[0083] like Figures 9 and 10 As shown, the jet rotating device 4 is provided with an air flow channel 408, and the air flow channel 408 is the only channel between the tow channel 5 and the first compressed air channel 301; the jet rotating device 4 is composed of a left fixed handle 401, an elliptical ball 402, a right fixed handle 407, and a right positioning handle 406 arranged in sequence along the left and right directions, the long axis of the elliptical ball 402 is parallel to the left and right directions, and an air flow channel 408 is provided in the elliptical ball 402, and the air flow channel 408 is Y-shaped, with air flow outlets a 403 and b 405 at the upper end and air flow outlets c 404 at the lower end, and the air flow outlets a 403 and b 405 are arranged at intervals along the left and right directions; the center of the orthographic projection of the air flow outlet c 404 coincides with the center of the orthographic projection of the elliptical ball 402; the left fixed handle 401, the right fixed handle 407, and the right positioning handle 406 are all cylindrical structures, and the central axes are parallel to the left and right directions; the jet rotating device 4 is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2μm;

[0084] like Fig.10As shown, the length L1 of the major axis of the ellipsoid 402 is 10 mm, and the length L2 of the minor axis of the ellipsoid 402 is 6 mm; the diameters of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 2 mm, and the lengths of the left fixing handle 401 and the right fixing handle 407 are the same and the value range is 8 mm; the diameter of the right positioning handle 406 is 1.5 mm, and the length L2 of the right positioning handle 406 is 2 mm; the airflow outlet a 403, the airflow outlet b 405 and the airflow outlet c 404 are circular, the diameters of the airflow outlet a 403 and the airflow outlet b 405 are 3 mm, and the diameter of the airflow outlet c 404 is 5 mm;

[0085] like Figures 9 and 10 As shown, the inner surface of the tow channel 5 is composed of an upper curved surface and a lower curved surface; the upper curved surface is a semicircular arc surface; the left edge of the semicircular arc surface is located directly above the junction of the left fixed handle 401 and the ellipsoid 402, and the right edge of the semicircular arc surface is located directly above the junction of the right fixed handle 407 and the ellipsoid 402; the gap between the right edge of the semicircular arc surface and the junction of the right fixed handle 407 and the ellipsoid 402 extends to the right to communicate with the outside air, forming a tow entrance, and the height of the tow entrance along the up-down direction is 2mm; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction; the maximum height of the tow channel 5 along the up-down direction is 8mm, and the minimum height is 6mm; the length of the tow channel 5 along the front-to-back direction is 40mm;

[0086] like Figures 9 and 10 As shown, a left groove and a right groove are provided at the junction of the tow channel 5 and the first compressed air channel 301; the shape of the left groove is the same as the left fixed handle 401, the left fixed handle 401 is embedded in the left groove, and the height of the gap between the two along the vertical direction is 0.05mm; the shape of the right groove is the same as the whole formed by the right fixed handle 407 and the right positioning handle 406, the whole formed by the right fixed handle 407 and the right positioning handle 406 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.05mm, the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8μm, so that the jet rotating device 4 is installed at the junction of the tow channel 5 and the first compressed air channel 301;

[0087] like Figures 8 and 9 As shown, the installation method of the jet rotating device 4 satisfies: the filament bundle enters the filament bundle channel 5 through the hanging channel 201, and when the filament bundle passes through the filament bundle channel 5, it contacts the jet rotating device 4 and drives the jet rotating device 4 to rotate around the central axis parallel to the left and right directions.

[0088] Example B1

[0089] A method for making interlaced dots of a plied industrial yarn, such as Figure 1As shown, a network device for twisted industrial yarns of Example A1 is used to pass twisted industrial yarns with a specification of 50000D / 4800f (twisted from 25 tested single yarns, each with a specification of 2000D / 192F) through the yarn bundle channel, and compressed air is continuously introduced into the first compressed air channel and the second compressed air channel. The network pressure of the first compressed air channel is 6 bar, and the network pressure of the second compressed air channel is 6 bar.

[0090] After leaving the tow channel, the twisted industrial yarn is first wound and formed before being tested. The winding speed is 600m / min, the winding tension is 2600cN, and the measured network density of the twisted industrial yarn is 12 / m, and the strength retention rate is 96%.

[0091] Comparative Example 1

[0092] A network device for twisted industrial yarns is basically the same as embodiment A1, and the only difference is that: no second compressed air channel is provided, and only a first compressed air channel is provided.

[0093] A method for making interlacing dots on a twisted industrial yarn is basically the same as that in Example B1, except that an industrial yarn interlacing device of this comparative example is used.

[0094] After the twisted industrial yarn leaves the tow channel, the network density of the twisted industrial yarn is 9 per meter and the strength retention rate is 92%.

[0095] Compared with Example B1, the network degree of the twisted industrial yarn of Example 1 after the network dots are made is reduced by 25%, and the strength retention rate is reduced by 4%. This is because the network device for the twisted industrial yarn of Example 1 does not have an opening zone (the second compressed air channel), and the yarn bundle cannot form a uniform single-filament winding structure in the network zone (the jet rotating device and the first compressed air channel), so the network degree is reduced; the reduction in network degree leads to poor cohesion of the yarn bundle, uneven force on the single filament during the stretching process, and reduced strength of the yarn bundle; before entering the network zone, the yarn bundle of Example B1 can be fully opened under the action of the opening zone, and uniform and effective single-filament entanglement is formed in the network zone, so the network degree and strength retention rate of Comparative Example 1 are worse than those of Example B1.

[0096] Comparative Example 2

[0097] A network device for twisted industrial yarns is basically the same as embodiment A1, with the only difference being that the airflow channel is not Y-shaped but straight cylindrical, and its diameter is the same as the airflow outlet c.

[0098] A method for making interlacing dots on a twisted industrial yarn is basically the same as that in Example B1, except that an industrial yarn interlacing device of this comparative example is used.

[0099] After the twisted industrial yarn leaves the tow channel, the network density of the twisted industrial yarn is 8 / m and the strength retention rate is 93%.

[0100] Compared with Example B1, the network degree of the twisted industrial yarn of Example 2 after network dotting is reduced by 33%, and the strength retention rate is reduced by 3%. This is because the airflow channel of the jet rotating device used in Example 2 is cylindrical, and the jet airflow of the cylindrical airflow channel can fully vibrate the filament bundle, but due to the large number of monofilaments in the filament bundle, the monofilament entanglement structure is insufficient, which in turn affects the network degree and strength retention rate; Example B1 uses a Y-shaped airflow channel, and under the alternating action of single holes and double holes, the monofilaments in the filament bundle can effectively form position replacement and more effectively form monofilament entanglement. Therefore, the network degree and strength retention rate of Comparative Example 2 are worse than those of Example B1.

[0101] Example B2

[0102] A method for making interlaced dots of a plied industrial yarn, such as Figure 1 As shown, a network device for twisted industrial yarns of Example A2 is used to pass twisted industrial yarns with a specification of 100000D / 9600f (twisted from 50 tested single yarns, each with a specification of 2000D / 192F) through the yarn bundle channel, and compressed air is continuously introduced into the first compressed air channel and the second compressed air channel. The network pressure of the first compressed air channel is 8 bar, and the network pressure of the second compressed air channel is 8 bar.

[0103] After leaving the tow channel, the twisted industrial yarn is first wound and formed before being tested. The winding speed is 400m / min, and the winding tension is 5000cN. The measured network density of the twisted industrial yarn is 10 / m, and the strength retention rate is 95%.

[0104] Example B3

[0105] A method for making interlaced dots of a plied industrial yarn, such as Figure 1 As shown, a network device for twisted industrial yarns of Example A3 is used to pass the twisted industrial yarns with a specification of 8000D / 768f (twisted from 4 tested single yarns, each with a specification of 2000D / 192F) through the yarn bundle channel, and continuously introduce compressed air into the first compressed air channel and the second compressed air channel. The network pressure of the first compressed air channel is 4 bar, and the network pressure of the second compressed air channel is 4 bar.

[0106] After leaving the tow channel, the twisted industrial yarn is first wound and formed before being tested. The winding speed is 1000m / min, the winding tension is 500cN, and the measured network density of the twisted industrial yarn is 15 / m, and the strength retention rate is 98%.

Claims

1. A network device for twisting industrial yarns, wherein a yarn bundle channel (5) and a first compressed air channel (301) are provided inside, wherein the extension direction of the yarn bundle channel (5) is parallel to the front-back direction, and the first compressed air channel (301) is located below the yarn bundle channel (5), characterized in that: An air jet rotating device (4) and a second compressed air channel are also provided inside; The jet rotating device (4) is installed at the junction of the tow channel (5) and the first compressed air channel (301); An air flow channel (408) is provided in the jet rotating device (4), and the air flow channel (408) is the only channel between the filament bundle channel (5) and the first compressed air channel (301); The jet rotating device (4) is installed in such a manner that: when the tow passes through the tow channel (5), it contacts the jet rotating device (4) and drives the jet rotating device (4) to rotate around a central axis parallel to the left-right direction; The jet rotating device (4) comprises a left fixed handle (401), an elliptical ball (402), a right fixed handle (407), and a right positioning handle (406) which are arranged in sequence along the left-right direction; the long axis of the elliptical ball (402) is parallel to the left-right direction; and the air flow channel (408) is located inside the elliptical ball (402); the air flow channel (408) is Y-shaped, with an air flow outlet a (403) and an air flow outlet b (405) at the upper end and an air flow outlet c (404) at the lower end; and the air flow outlet a (403) and the air flow outlet b (405) are arranged at intervals along the left-right direction; The inner surface of the tow channel (5) is composed of an upper curved surface and a lower curved surface; the upper curved surface is a semicircular arc surface; The left edge of the semicircular arc surface is located directly above the junction of the left fixed handle (401) and the ellipsoidal sphere (402), and the right edge of the semicircular arc surface is located directly above the junction of the right fixed handle (407) and the ellipsoidal sphere (402); The second compressed air channel is located above the tow channel (5) and behind the first compressed air channel (301). The first compressed air channel (301) and the second compressed air channel are arranged at intervals in the front-to-back direction.

2. A network device for twisting industrial yarn according to claim 1, characterized in that: The airflow outlet a (403), the airflow outlet b (405) and the airflow outlet c (404) are circular, the diameters of the airflow outlet a (403) and the airflow outlet b (405) are 3-4 mm, and the diameter of the airflow outlet c (404) is 5-6 mm; the center of the orthographic projection of the airflow outlet c (404) coincides with the center of the orthographic projection of the ellipsoid (402).

3. A network device for twisting industrial yarn according to claim 2, characterized in that: The length of the major axis of the ellipsoid (402) is 10-15 mm, and the length of the minor axis of the ellipsoid (402) is 6-8 mm; The left fixing handle (401), the right fixing handle (407), and the right positioning handle (406) are all cylindrical structures, and the central axis is parallel to the left and right directions; The diameters of the left fixing handle (401) and the right fixing handle (407) are the same and are in the range of 2-3 mm, and the lengths of the left fixing handle (401) and the right fixing handle (407) are the same and are in the range of 8-10 mm; The diameter of the right positioning handle (406) is 1.5-2 mm, and the length of the right positioning handle (406) is 2-3 mm; The jet rotating device (4) is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2-2.0 μm.

4. A network device for twisting industrial yarn according to claim 3, characterized in that: A left groove and a right groove are provided at the junction of the tow channel (5) and the first compressed air channel (301) inside the network device for twisting industrial yarns; The shape of the left groove is the same as that of the left fixing handle (401), and the left fixing handle (401) is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The shape of the right groove is the same as the whole formed by the right fixing handle (407) and the right positioning handle (406), and the whole formed by the right fixing handle (407) and the right positioning handle (406) is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8-1.0 μm.

5. The network device for twisting industrial yarn according to claim 1, characterized in that: The lower curved surface is arched upward in the front-to-back direction and arched downward in the left-to-right direction; the maximum height of the tow channel (5) in the up-down direction is 8-12 mm, and the minimum height is 6-10 mm; the length of the tow channel (5) in the front-to-back direction is 40-60 mm.

6. The network device for twisting industrial yarn according to claim 1, characterized in that: The spacing between the first compressed air channel (301) and the second compressed air channel along the front-to-back direction is 25-30 mm.

7. The network device for plying industrial yarn according to claim 1, characterized in that: The extension direction of the first compressed air channel (301) is parallel to the up-down direction, and the first compressed air channel (301) is a cylindrical structure with a diameter of 4-6 mm; The second compressed air channel is composed of an air intake channel (101), a pressure stabilization chamber (102), and an injection channel (103) which are arranged in sequence from top to bottom and are connected; The extending directions of the air inlet channel (101) and the injection channel (103) are both parallel to the up-down direction; The air inlet channel (101) is a cylindrical structure with a diameter of 5-6 mm; the pressure stabilizing chamber (102) is a cubic structure with a length of 8-10 mm in the left-right direction, a length of 5-6 mm in the front-back direction, and a height of 3-4 mm in the up-down direction; the injection channel (103) is a cylindrical structure with a diameter of 2-3 mm and a length of 3-4 mm in the up-down direction; The number of injection channels (103) is three and they are arranged in parallel in the left-right direction.

8. The network device for twisting industrial yarn according to claim 1, characterized in that: The network device for twisted industrial yarns comprises an upper cover layer (1), an intermediate layer (2), and a main body layer (3) which are arranged in sequence from top to bottom; a yarn bundle channel (5) is arranged in the intermediate layer (2); a first compressed air channel (301) is arranged in the main body layer (3); and a second compressed air channel is arranged in the upper cover layer (1) and the intermediate layer (2).

9. A method for making interlaced dots of twisted industrial yarn, characterized in that: A network device for twisted industrial yarn as described in any one of claims 1 to 8 is used to pass the twisted industrial yarn through the yarn bundle channel (5), and compressed air is continuously introduced into the first compressed air channel (301) and the second compressed air channel.

10. A method for making interlaced dots of twisted industrial yarn according to claim 9, characterized in that: The specification of the twisted industrial yarn is 8000D / 768f-100000D / 9600f, the winding speed is 400-1000m / min, the winding tension is 500-5000cN, the network pressure of the first compressed air channel (301) is 4-8bar, the network pressure of the second compressed air channel is 4-8bar, and after the tow leaves the tow channel (5), the network density is 10-15 pieces / meter, and the strength retention rate is 95%-98%.

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