A basalt multifilament eddy current twisting device and method

Abstract

The present invention relates to the field of textile processing technology, and in particular to a basalt multifilament vortex twisting device and method. A basalt multifilament vortex twisting device of the present invention comprises a driving mechanism, a spinneret, a turbine and a shell; the top of the shell is open, and the spinneret is arranged on the top of the shell; the turbine is arranged in the shell, and its outer wall is spaced a certain distance from the shell, and its central axis passes through the spinneret and is transmission-connected to the driving end of the driving mechanism, and a multifilament output hole is provided at the bottom of the shell corresponding to the central axis. The turbine of the present invention twists the multifilament by generating airflow, which belongs to airflow twisting, avoiding the wear and brittle breakage of the basalt multifilament caused by mechanical grip twisting; it can be directly connected to the melt spinning equipment, avoiding the process of unwinding and twisting the single filament into a multifilament after winding.

Description

Technical Field

[0001] The present invention relates to the technical field of textile processing, and in particular to a basalt multifilament eddy current twisting device and method. Background Art

[0002] Basalt inorganic fiber boasts excellent properties and is recognized as a high-tech fiber. Its superior mechanical properties, high-temperature resistance, flame retardancy, chemical stability, and environmental friendliness meet the needs of diverse industries, such as aerospace, military, shipbuilding, healthcare, and civil engineering. Compared to most other high-tech fibers, basalt fiber, due to its outstanding environmental and low-cost characteristics, has attracted the attention and research of scholars both domestically and internationally, and has found application in numerous fields.

[0003] In order to adapt to different usage scenarios, factories often pre-twist basalt multifilaments, that is, after melt spinning, they are twisted and plyed through a two-for-one twister. However, due to the shortcomings of existing technologies, this process often faces some problems: ① The poor bending properties of basalt fiber make it difficult to weave, and conventional mechanical gripping and twisting can easily cause it to break brittlely; ② The existing twisting and plying through a two-for-one twister can easily cause wear on the basalt fiber, thereby reducing the quality of the multifilaments; ③ The additional use of a two-for-one twister requires unwinding multiple multifilaments, twisting them, and then winding them into packages. Multiple unwinding and winding will also affect the quality of the multifilaments. Therefore, it is currently urgent to systematically carry out research on the twisting equipment and process flow of basalt multifilaments, and to develop a low-loss, short-process basalt multifilament twisting device. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and propose a basalt multifilament eddy current twisting device and method to overcome the problems of brittle breakage and wear during the twisting of basalt multifilaments in the prior art, as well as the problems of multiple winding and unwinding affecting the quality of the multifilaments.

[0005] A basalt multifilament vortex twisting device of the present invention includes a driving mechanism, a spinneret, a turbine and a housing; the top of the housing is open, and the spinneret is arranged on the top of the housing; the turbine is arranged in the housing, and its outer wall is spaced a certain distance from the housing, and its central axis passes through the spinneret and is transmission-connected to the driving end of the driving mechanism, and a multifilament output hole is provided at a position corresponding to the central axis on the bottom of the housing.

[0006] Furthermore, the turbine is a shuttle-shaped component that is thick in the middle and thin at both ends, and has multiple turbine blades evenly distributed around the central axis on the outside.

[0007] Furthermore, there are 10-15 turbine blades evenly distributed on the outside, the axial length of the turbine is 40-60 cm, and the maximum cross-sectional diameter is 20-30 cm.

[0008] Furthermore, the spinneret holes on the spinneret are evenly distributed outwards from the central axis along its radius.

[0009] Furthermore, the distance between adjacent spinnerets located on a straight line of radius is 1 mm; and the diameter of the spinneret is 1 mm.

[0010] Furthermore, the angle between the axial direction and the vertical direction of the spinneret is 0°-60°.

[0011] Furthermore, the middle section of the shell is provided with oil injection holes in a ring shape, and the outer ends of the oil injection holes are connected to the oil pump through leather hoses; the bottom of the shell is provided with an oil groove surrounding the multifilament output hole, and the outer wall of the oil groove is provided with an oil recovery hole, and the oil recovery hole is connected to the oil pump through a leather hose.

[0012] Furthermore, an inverted L-shaped baffle is provided at the bottom of the shell extending toward the oil tank, and the oil recovery hole is provided on the outer wall of the oil tank away from the surrounding multifilament output hole, and the distance from the oil recovery hole to the bottom of the oil tank is greater than the distance from the bottom end of the inverted L-shaped baffle to the bottom.

[0013] Furthermore, the inner wall of the shell is a curved surface and is provided with a ceramic coating.

[0014] Furthermore, the driving mechanism includes a motor and a belt, and the belt is sleeved on the driving end of the motor and the top end of the central shaft of the turbine.

[0015] A basalt multifilament vortex twisting method uses the above-mentioned basalt multifilament vortex twisting device, arranges a spinneret below the melt outlet of a melt spinning device, and controls the speed of a turbine through a driving mechanism to obtain basalt multifilaments with different twists.

[0016] When the turbine of the present invention is working, it rotates at high speed along the central axis to form a vortex airflow, which is divided into two parts: a clockwise annular airflow and an axially downward straight airflow. The clockwise annular airflow part will drive the multifilament to rotate and twist it in the Z direction, while the axially downward straight airflow forms a negative pressure area at the lower end of the shell, and outputs the multifilament twisted by the airflow to the winding mechanism, that is, a vortex and a negative pressure area are formed inside, and the multifilament is twisted and transported downward. In addition, by controlling the rotation speed of the turbine, the twist of the multifilament can be controlled.

[0017] The spinneret of the vortex twisting device for basalt multifilament yarns of the present invention is directly connected to the melt spinning equipment. After the multifilament yarn is formed and cooled, it is twisted and wound. The turbine generates airflow to twist the multifilament yarn, which is an airflow twisting method. This avoids the wear and brittle fracture of the basalt multifilament yarn caused by mechanical grip twisting. The spinneret can be directly connected to the melt spinning equipment, avoiding the process of unwinding, twisting and plying the single filament yarn into multifilament yarn after winding. Therefore, the present invention not only has a wide range of applications but also effectively controls costs while ensuring the effectiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a basalt multifilament eddy current twisting device according to the present invention;

[0019] Figure 2 2 is a diagram showing the twisting principle of the present invention;

[0020] Figure 3 Schematic diagram of the angle between the axial direction and the vertical direction of the spinneret.

[0021] 1. Driving mechanism; 2. Spinneret; 3. Turbine; 4. Housing; 5. Multifilament output hole; 6. Vortex blades; 7. Oil tank; 8. Oil injection hole; 9. Oil recovery hole; 10. Inverted L-shaped baffle; 11. Motor; 12. Belt. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, a basalt multifilament vortex twisting device of the present invention includes a driving mechanism 1, a spinneret 2, a turbine 3 and a housing 4; the top of the housing 4 is open, and the spinneret 2 is arranged on the top of the housing 4; the turbine 3 is arranged in the housing 4, and its outer wall is spaced a certain distance from the housing 4, and its central axis passes through the spinneret 2 and is transmission-connected to the driving end of the driving mechanism 1, and a multifilament output hole 5 is provided at the bottom of the housing 4 at a position corresponding to the central axis.

[0025] When the turbine 3 of the present invention is working, it rotates at high speed along the central axis to form a vortex airflow, which is divided into two parts: a clockwise annular airflow and an axially downward straight airflow. The clockwise annular airflow part will drive the multifilament to rotate and twist it in the Z direction, while the axially downward straight airflow forms a negative pressure area at the lower end of the inner part of the outer shell 4, and outputs the multifilament twisted by the airflow to the winding mechanism, that is, a vortex and a negative pressure area are formed inside, and the multifilament is twisted and transported downward. In addition, by controlling the rotation speed of the turbine 3, the twist of the multifilament can be controlled.

[0026] The spinneret 2 of the basalt multifilament vortex twisting device of the present invention is directly connected to the melt spinning equipment. After the multifilament is formed and cooled, it is twisted and wound. The turbine 3 twists the multifilament by generating airflow. This is an airflow twisting method, which avoids the wear and brittle fracture of the basalt multifilament caused by mechanical grip twisting. The direct connection with the melt spinning equipment avoids the process of unwinding and twisting the single filament into a multifilament after winding. Therefore, the present invention not only has a wide range of applications but also effectively controls costs while ensuring the effectiveness of the product.

[0027] In this embodiment, the turbine 3 can be a spindle-shaped component with a thick middle section and thin ends, with multiple vortex blades 6 evenly distributed around the central axis on the outside. There can be 10-15 vortex blades 6 evenly distributed on the outside, the axial length of the turbine 3 is 40-60 cm, and the maximum cross-sectional diameter is 20-30 cm. The upper end of the turbine 3 can pass through the spinneret 2 and connect to the drive mechanism 1. When working, the turbine 3 is driven by the drive mechanism 1 to rotate clockwise at high speed, forming a vortex airflow that is clockwise downward as a whole. For the sake of clarity, in Figure 2 In the figure, the vortex airflow is divided into two parts: a clockwise annular airflow and an axially downward straight airflow. It can be seen that the clockwise annular airflow part will drive the multifilament to rotate and twist it in the Z direction, while the axially downward straight airflow forms a negative pressure area at the lower end of the inner part of the shell 4, and outputs the multifilament twisted by the airflow to the winding mechanism.

[0028] The spinneret 2 is a component used to control the shape and output position of the basalt filaments. It can be made of a platinum-rhodium alloy. The spinneret holes on the spinneret 2 are evenly distributed along the radius from the central axis, ensuring that the filaments enter the vortex in a uniform annular distribution. A ring of barriers can be installed around the spinneret 2 to receive the melt.

[0029] The spinneret 2 can be a circular spinneret with a diameter of 40 cm. The spacing between adjacent spinneret holes on a straight radial line is 1 mm. The spinneret holes have a diameter of 1 mm. A circular hole with a diameter of 8 cm can be located in the center of the spinneret 2 to facilitate the transmission connection between the upper drive mechanism 1 and the lower turbine 3. Therefore, in the operating state, the spinneret 2 remains stationary. The multifilament output hole 5 can have a diameter of 6 mm.

[0030] The middle section of the housing 4 is annularly distributed with 1mm diameter oil spray holes 8, which are connected to an oil pump via a hose. During operation, the spray holes 8 spray oil into the interior of the housing 4, causing the surface of the passing monofilaments to adhere to the oil, thereby reducing friction losses. The oil sprayed into the middle section of the housing 4 flows back down through the inner wall into the oil tank 7. The outer wall of the oil tank 7 is provided with a 3mm diameter oil recovery hole 9, which can be recovered by an oil recovery device (not shown) or connected to an oil pump (not shown) via a hose. During operation, the oil pump draws the oil accumulated in the oil tank 7 into the middle section for spraying and recycling. It should be noted that the oil removed by the monofilaments through adhesion needs to be replenished by the oil pump.

[0031] The bottom of the housing 4 may be provided with an inverted L-shaped baffle 10 extending toward the oil tank 7. The oil recovery hole 9 is provided on the outer wall of the oil tank 7 away from the surrounding multifilament output hole 5, and the distance between the oil recovery hole and the bottom of the oil tank 7 is greater than the distance from the bottom end of the inverted L-shaped baffle 10 to the bottom. This allows the oil in the oil tank 7 to seal against airflow.

[0032] The inner wall of the shell 4 is a curved surface and is provided with a ceramic coating, which can reduce the friction of the multifilament during high-speed rotation. The shell 4 mainly plays the role of preventing the diffusion of eddy currents.

[0033] There are many structures of the driving mechanism 1. For example, the driving mechanism 1 may include a motor 11 and a belt 12. The belt 12 is mounted on the driving end of the motor 11 and the top of the central axis of the turbine 3. The motor 11 drives the belt 12 to rotate, and the belt 12 drives the central axis of the turbine 3 to rotate.

[0034] In another achievable manner, the upper end of the turbine 3 can pass through the spinneret 2 and be connected to the rotating shaft of the motor 11 via a coupling. The motor 11 directly drives the turbine 3 to rotate.

[0035] By controlling the rotation speed of the turbine 3, the twist of the multifilament can be controlled. The rotation speed of the turbine 3 is 1600 to 2400 RPM.

[0036] Example 2

[0037] A basalt multifilament vortex twisting method uses the above-mentioned basalt multifilament vortex twisting device, sets the spinneret 2 below the melt outlet of the melt spinning equipment, and controls the speed of the turbine 3 through the driving mechanism 1 to obtain basalt multifilaments with different twists.

[0038] Two groups of basalt multifilament yarns were spun using a TBI500 melt spinning machine for comparison. The first group used the Turbine 3 multifilament twisting device of the present invention; the second group, without the device, produced monofilaments that were twisted and ply-coated using a two-for-one twister to produce twisted multifilament yarns. The equipment parameters were as follows: melt temperature of 1100°C, number of filaments 165, spinneret aperture of 1 mm, spinning speed of 34 m / min, winding speed of 35 m / min, and twist of 30 twists / m for each multifilament yarn. The resulting multifilament yarns were tested for evenness and mechanical properties, with the results shown in Table 1.

[0039] Table 1 Quality of multifilament yarns produced under two different processes

[0040]

[0041] As shown in Table 1, the yarn unevenness of the multifilaments produced using the apparatus of the present invention is lower than that of the multifilaments produced using a two-for-one twister. The number of brittle fractures of the single filaments is also greatly reduced, and the breaking strength is also somewhat improved. This indicates that the apparatus of the present invention effectively reduces the mechanical losses caused by wear and brittle fracture of the basalt multifilaments.

[0042] Example 3

[0043] The angle between the axial direction and the vertical direction of the spinneret can be 0°-60°.

[0044] After the monofilament is ejected from the spinneret, it will be quickly sucked by the vortex and be in a gripping state, which will cause the monofilament to be folded at the lower end of the spinneret, thereby increasing the probability of brittle breakage and wear.

[0045] like Figure 3 As shown, this embodiment offsets the fold angle of the monofilament at the lower end of the spinneret by changing the inclination angle of the spinneret in the vertical direction. The inclination angle of the spinneret was designed, and 0°, 30°, and 60° were designed. After spinning and testing, it was found that the size of the fold angle is related to the twisting speed of the device, that is, the greater the twist of the multifilament, the greater the fold angle generated, and the greater the probability of brittle breakage or wear of the monofilament. Finally, through further testing and matching, it was found that a spinneret inclination angle of 30° can effectively offset the fold angle of the monofilament when spinning multifilaments with a twist of less than 40 degrees, and an inclination angle of 60° is suitable for spinning multifilaments with a twist of less than 80 degrees. If the inclination angle continues to increase, the profit effect will gradually decrease.

[0046] Any matters not mentioned above shall be subject to the existing technology.

[0047] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art of the present invention may make various modifications or additions to the described specific embodiments or replace them in similar ways, but they will not deviate from the direction of the present invention or exceed the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the scope of protection of the present invention.

Claims

1. A basalt multifilament eddy current twisting device, characterized by: The invention comprises a driving mechanism (1), a spinneret (2), a turbine (3) and a housing (4); the top of the housing (4) is open, and the spinneret (2) is arranged on the top of the housing (4); the turbine (3) is arranged in the housing (4), and its outer wall is spaced a certain distance from the housing (4); its central axis passes through the spinneret (2) and is transmission-connected to the driving end of the driving mechanism (1); a multifilament output hole (5) is provided at a position corresponding to the central axis on the bottom of the housing (4); The turbine (3) is a spindle-shaped component with a thick middle section and thin ends, and a plurality of vortex blades (6) are evenly distributed around the central axis on the outside; The spinneret holes on the spinneret (2) are evenly distributed outwards along the radius from the central axis.

2. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: There are 10-15 vortex blades (6) evenly distributed on the outside. The axial length of the turbine (3) is 40-60 cm, and the maximum cross-sectional diameter is 20-30 cm.

3. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: The distance between adjacent spinneret holes located on a radial straight line is 1 mm; the diameter of the spinneret hole is 1 mm.

4. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: The angle between the axial direction and the vertical direction of the spinneret is 0°-60°.

5. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: The middle section of the housing (4) is provided with oil injection holes (8) in a circular pattern, and the outer ends of the oil injection holes (8) are connected to the oil pump via leather hoses; the bottom of the housing (4) is provided with an oil groove (7) surrounding the multifilament output hole (5), and the outer wall of the oil groove (7) is provided with an oil recovery hole (9), and the oil recovery hole (9) is connected to the oil pump via leather hoses.

6. The eddy current twisting device for basalt multifilament yarn according to claim 5, characterized in that: An inverted L-shaped baffle (10) is provided at the bottom of the housing (4) extending toward the oil tank (7). The oil recovery hole (9) is provided on the outer wall of the oil tank (7) away from the winding multifilament output hole (5), and the distance from the oil recovery hole to the bottom of the oil tank (7) is greater than the distance from the bottom end of the inverted L-shaped baffle (10) to the bottom.

7. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: The inner wall of the shell (4) is a curved surface and is provided with a ceramic coating.

8. The eddy current twisting device for basalt multifilament yarn according to claim 1, characterized in that: The driving mechanism (1) comprises a motor (11) and a belt (12), wherein the belt (12) is sleeved on the driving end of the motor (11) and the top end of the central shaft of the turbine (3).

9. A basalt multifilament eddy current twisting method, characterized by: Using the basalt multifilament vortex twisting device according to any one of claims 1 to 8, the spinneret (2) is arranged below the melt outlet of the melt spinning equipment, and the rotation speed of the turbine (3) is controlled by the driving mechanism (1) to obtain basalt multifilaments with different twists.

Images