Raw yarn preparation device with uniform oiling and adjustable oiling rate and control method of raw yarn preparation device

Abstract

The invention provides a uniform-oiling and adjustable-oiling-rate precursor preparation device and a control method thereof.The uniform-oiling and adjustable-oiling-rate precursor preparation device comprises a pressing roller, a pressing roller driving assembly and an upper filament drawing transmission roller, precursor capable of advancing is arranged on the periphery of the upper filament drawing transmission roller, and the pressing roller driving assembly is arranged on the periphery of the upper filament drawing transmission roller; the pressing roller is located at the upper end of the upper wire drawing transmission roller and can make contact with the protofilaments so as to apply pressure to the protofilaments on the upper wire drawing transmission roller, and the pressing roller driving assembly can drive the pressing roller to apply different pressures to the upper wire drawing transmission roller according to different specifications of the protofilaments and the number of spinning positions. It is guaranteed that the precursor reaches the target oiling rate, and the oiling rate is uniform. According to the invention, the problems that the pressure on multi-spinning-position tows is not uniform, the oiling cannot reach a target value due to overlarge pressure of the compression roller, or the adjustable range of the oiling rate of a multi-specification engineering preparation production line is small in an existing compression roller control mode can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of fiber preparation, and in particular to a raw silk preparation device with uniform oiling and adjustable oiling rate and a control method thereof. Background Art

[0002] Polyacrylonitrile-based carbon fiber has the advantages of high tensile strength, high tensile modulus, and low density. It is widely used in aerospace, aviation, hydrogen storage cylinders, wind turbine blades, building reinforcement and other fields. Oiling agent is an important auxiliary material for the production of high-performance PAN precursor and carbon fiber. The uniform film formation of oiling agent on the surface of monofilament is one of the effective technical measures to improve the performance of precursor and carbon fiber. Therefore, in the production process of polyacrylonitrile carbon fiber precursor, oiling treatment is an important factor affecting the quality of carbon fiber. If the oiling rate of the precursor is too low, an oil film cannot be formed on the surface of the monofilament, and the surface of the monofilament is easily damaged during the contact between the fiber and the hot roller; if the oiling rate is too high, the excess amount of oiling agent is too much, and it is easy to melt during the densification process, resulting in the occurrence of paralleling or sticking to the roller, which makes the tow easy to produce hairy and broken wires; at the same time, the volatilization or pyrolysis of excessive oiling agent will also cause pollution in the pre-oxidation process, so it is very important to control the oiling rate of the precursor.

[0003] In order to ensure the uniformity of oiling of the raw silk and controllable oiling rate, the main measures currently taken are: (1) oil circulation and replenishing device to ensure the stability of the oil concentration in the upper oil tank, and (2) use of pressure rollers to squeeze out excess oil after the fiber leaves the upper oil tank, and rely on the extrusion force to make the oil penetrate into the fiber to further enhance the uniformity of oiling.

[0004] The existing oiling roller equipment includes manual rollers and pneumatic rollers. The manual roller is manually adjusted by the operator to adjust the horizontal and pressure of the roller's downward pressure by adjusting the screws at both ends of the roller. The pressure applied by the roller to the transmission roller cannot be quantified, which easily causes the pressure at both ends of the roller to be unbalanced, resulting in a large difference in the oiling rate between the spinning positions, or the pressure after lifting and lowering is inconsistent with the previous pressure, and the roller state needs to be adjusted multiple times according to the measured oiling rate of the raw yarn. In addition, the pneumatic roller only has a pressurizing function. For production lines with engineering preparation of raw yarns of various specifications (3K-48K), the oiling rates of raw yarns of different specifications are different under the same roller pressure. In order to ensure the oiling rate of small tow fibers, the roller's own weight is usually relatively large. After switching to large tow fibers, there is a situation where the oiling rate of the tow cannot reach the target oiling rate even if the roller's own weight is the only factor. If the roller's own weight is small, it is necessary to apply additional pressure for a long time, which increases the pressure requirements on equipment components and reduces the service life of equipment such as rollers.

[0005] Since the pressure roller control method in the prior art causes uneven pressure on the multi-spinning position bundles, the pressure of the pressure roller is too high, resulting in the oiling failing to reach the target value, or the oiling rate on the multi-specification engineering production line has a small adjustable range, resulting in the uncontrollable oiling rate of the raw silk, and uneven oiling of the fibers at each spinning position, etc., the present invention studies and designs a raw silk preparation device with uniform oiling and adjustable oiling rate and a control method thereof. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the pressure roller control method in the prior art, such as uneven pressure on multi-spinning position filament bundles, excessive pressure on the pressure roller resulting in the oiling failing to reach the target value, or a small adjustable range of the oiling rate on the multi-specification engineering preparation production line, resulting in the uncontrollable oiling rate of the raw silk and uneven oiling of the fibers at each spinning position, thereby providing a raw silk preparation device with uniform oiling and adjustable oiling rate and a control method thereof.

[0007] In order to solve the above problems, the present invention provides a raw silk preparation device with uniform oiling and adjustable oiling rate, which comprises:

[0008] A pressure roller and a pressure roller driving assembly, and an upper wire drawing transmission roller. The outer periphery of the upper wire drawing transmission roller is provided with a movable raw silk. The pressure roller is located at the upper end of the upper wire drawing transmission roller and can contact the raw silk to apply pressure to the raw silk on the upper wire drawing transmission roller. The pressure roller driving assembly can drive the pressure roller to apply different pressures to the upper wire drawing transmission roller according to different specifications of the raw silk and the number of spinning positions, so as to ensure that the raw silk reaches the target oil application rate and the oil application rate is uniform.

[0009] In some embodiments,

[0010] It also includes a cylinder assembly and a pressure roller fixing device, the pressure roller has a central axis, the pressure roller fixing device is connected to the central axis, the cylinder assembly includes a cylinder, a piston rod and a piston, the piston is located inside the cylinder, the upper end of the piston rod is inserted into the cylinder to be fixedly connected with the piston, the lower end of the piston rod extends out of the cylinder and is hinged to the pressure roller fixing device so that a force can be applied to the pressure roller through the pressure roller fixing device, and the pressure roller driving assembly can control the piston according to the different specifications of the raw silk and the number of spinning positions to apply different pressures to the pressure roller.

[0011] In some embodiments,

[0012] The pressure roller drive assembly includes a multi-way valve, a one-way valve, a pressure reducing valve and a throttle valve. One end of the multi-way valve can be connected to the air circuit, and the other end is connected to the one-way valve or the pressure reducing valve. The one-way valve is arranged in parallel with the pressure reducing valve, and the other end of the one-way valve or the pressure reducing valve is connected to the throttle valve, and the throttle valve is further connected to the rod chamber or the rodless chamber of the cylinder. The rod chamber is the chamber where the piston rod is located and can move therein, and the piston rod is not arranged in the rodless chamber. The cylinder is arranged in a vertical direction, and the rod chamber is located at the lower end of the rodless chamber, and the lower end of the piston rod extends out of the rod chamber and is connected to the pressure roller fixing device, so that gases of different pressures can be introduced into the rod chamber or the rodless chamber to control the piston to lift the pressure roller or press down the pressure roller or apply different pressures to the pressure roller.

[0013] In some embodiments,

[0014] The one-way valve includes a first one-way valve and a second one-way valve, and the pressure reducing valve includes a first pressure reducing valve and a second pressure reducing valve.

[0015] It also includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, one end of the first pipeline is connected to the multi-way valve, and the other end is connected to the rodless chamber at the upper end of the cylinder, the first pressure reducing valve is arranged on the first pipeline, the first check valve is arranged on the second pipeline and connected in parallel to the two ends of the first pressure reducing valve, and the first check valve only allows the fluid to flow from the rodless chamber to the multi-way valve;

[0016] One end of the third pipeline is connected to the multi-way valve, and the other end is connected to the rod chamber at the lower end of the cylinder. The second pressure reducing valve is arranged on the third pipeline. The second one-way valve is arranged on the fourth pipeline and is connected in parallel to both ends of the second pressure reducing valve, and the second one-way valve only allows fluid to flow from the rod chamber to the multi-way valve.

[0017] In some embodiments,

[0018] The air inlet end of the multi-way valve is connected to the air inlet through the pressure reducing valve triplet. When the multi-way valve is powered off, the multi-way valve is connected to the third pipeline inside the multi-way valve after the air is inlet, and the gas is introduced into the rod chamber of the cylinder after passing through the second pressure reducing valve and the throttle valve, and the piston is controlled so that the pressure roller reduces the downward pressure on the upper wire drawing transmission roller, and the throttle valve under the gas passage keeps the gas straight without throttling;

[0019] When the multi-way valve is energized, the multi-way valve is connected with the first pipeline inside the multi-way valve after taking in air, and the gas is introduced into the rodless chamber of the cylinder after passing through the first pressure reducing valve and the throttle valve, and the piston is controlled so that the pressure roller increases the downward pressure on the upper wire drawing drive roller, and the throttle valve under the gas passage keeps the gas straight without throttling.

[0020] In some embodiments,

[0021] When the multi-way valve is switched from energized to de-energized, when the upward pressure exerted by the piston on the pressure roller is greater than the gravity of the pressure roller, the piston can also move upward to drive the gas in the rodless chamber to enter the second pipeline after passing through the throttle valve, and be discharged through the multi-way valve after passing through the first one-way valve. The throttle valve here can throttle the gas to adjust the speed of gas discharge in the rodless chamber, so as to accurately control the speed of the piston rod lifting, so that the two ends of the pressure roller are synchronously lifted to the same position under the action of the cylinder piston rod;

[0022] When the multi-way valve is switched from power-off to power-on, the piston can also move downward to drive the gas in the rod chamber to pass through the throttle valve and then enter the fourth pipeline, and be discharged through the multi-way valve after passing through the second one-way valve. The throttle valve here can throttle the gas to adjust the speed at which the gas in the rod chamber is discharged, so as to accurately control the speed at which the piston rod descends, so that the two ends of the pressure roller are synchronously attached to the surface of the upper wire drawing transmission roller under the action of the cylinder piston rod.

[0023] In some embodiments,

[0024] The multi-way valve is a two-position five-way valve, including ports: end a, end b, end c, end d and end e, end a, d and e are located on one side of the two-position five-way valve, end b and c are located on the other side of the two-position five-way valve, end a can be connected with end b and only allow fluid to flow from end a to end b, end e can be connected with end c and only allow fluid to flow from end c to end e, end a can also be connected with end c and only allow fluid to flow from end a to end c, end d can also be connected with end b and only allow fluid to flow from end b to end d;

[0025] When the two-position five-way valve is powered off, end a is connected to end c, end b is connected to end d, one end of the third pipeline is connected to end c, and one end of the second pipeline can be connected to end b; when the two-position five-way valve is powered on, end a is connected to end b, end c is connected to end e, one end of the first pipeline is connected to end b, and one end of the fourth pipeline can be connected to end c.

[0026] In some embodiments,

[0027] It also includes an electric drive device, an upper oil tank body, a lower wire drawing drive roller and an oil filter rod, the electric drive device includes a position sensor, a motor and a knob, the position sensor can detect the positional relationship between the pressure roller and the upper wire drawing drive roller, the motor is connected to the pressure roller to drive the pressure roller to rotate or stop rotating, and the knob can control whether the two-position five-way valve is in an energized state or an off-power state; the lower wire drawing drive roller is located below the upper wire drawing drive roller and can pull the raw silk, the lower wire drawing drive roller is located above the upper oil tank body, the oil filter rod is located between the lower wire drawing drive roller and the upper wire drawing drive roller, and the raw silk passes through the two rods of the oil filter rod in an "S"-shaped path, and the raw silk passes through the upper oil tank body, the lower wire drawing drive roller, the oil filter rod and the upper wire drawing drive roller in sequence; and the oil filter rod is a parallel double-rod structure, and the angle between the connecting line of the double rods and the extension direction of the raw silk is 0-45°;

[0028] There are two cylinders, which are connected in parallel, including a first cylinder and a second cylinder. A first throttle valve is arranged on the pipeline connected to the rodless chamber at the upper end of the first cylinder, a second throttle valve is arranged on the pipeline connected to the rod chamber at the lower end of the first cylinder, a third throttle valve is arranged on the pipeline connected to the rodless chamber at the upper end of the second cylinder, and a fourth throttle valve is arranged on the pipeline connected to the rod chamber at the lower end of the second cylinder.

[0029] The present invention also provides a control method for the above-mentioned precursor preparation device with uniform and adjustable oiling, which comprises:

[0030] Testing step, testing the specifications of the raw yarn and the number of spinning positions;

[0031] The control step is to control the pressure roller to apply different pressures to the upper wire drawing drive roller according to the specifications of the raw silk and the number of spinning positions, and the position state of the pressure roller and the upper wire drawing drive roller is in which of the following four states:

[0032] The first state is a state in which the pressure roller is completely separated from the upper wire drawing drive roller, that is, a state in which the pressure roller is lifted; the second state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is the pressure applied by the pressure roller's own weight; the third state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied to the upper wire drawing drive roller is greater than the pressure applied by the pressure roller's own weight; the fourth state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is less than the pressure applied by the pressure roller's own weight.

[0033] In some embodiments,

[0034] In the first state, the two-position five-way valve is controlled to be powered off, and the force converted by the gas pressure allowed to pass through by the second pressure reducing valve is greater than the weight of the pressure roller; in the second state, the two-position five-way valve is controlled to be powered on, and the gas pressure allowed to pass through by the first pressure reducing valve = 0 bar, or, the two-position five-way valve is controlled to be powered off, and the gas pressure allowed to pass through by the second pressure reducing valve = 0 bar; in the third state, the two-position five-way valve is controlled to be powered on, and the pressure applied to the upper wire drawing drive roller = the pressure applied by the weight of the pressure roller + the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the first pressure reducing valve, and the range is 0bar < additional pressure ≤ 7bar; in the fourth state, the two-position five-way valve is powered off, and the pressure applied to the wire drawing drive roller = the pressure applied by the weight of the pressure roller - the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the second pressure reducing valve, and the range is 0bar < additional pressure < 1.5bar; the pressure applied by the weight of the pressure roller is in the range of 2-3bar.

[0035] The present invention provides a raw silk preparation device with uniform oiling and adjustable oiling rate and a control method thereof, which have the following beneficial effects:

[0036] 1. The present invention provides a pressure roller and a pressure roller driving assembly, wherein the pressure roller is located at the upper end of the upper wire drawing drive roller so as to apply pressure to the raw yarn on the upper wire drawing drive roller, and the pressure roller driving assembly can drive the pressure roller to apply different pressures to the upper wire drawing drive roller according to different specifications of the raw yarn and the number of spinning positions, so as to ensure that the raw yarn reaches the target oiling rate and the oiling rate is uniform. This solves the problems of uneven pressure of multi-spinning position yarn bundles and small adjustable range of pressure roller pressure for different raw yarn specifications and number of spinning positions in the existing pressure roller control method, resulting in uneven oiling between fibers and failure of the fibers to reach the target oiling rate. This improves the uniformity of oiling of fibers between spinning positions and the adjustable range of oiling rate on a multi-specification engineering preparation production line, thereby realizing the preparation of multi-specification raw yarns on the production line.

[0037] 2. The present invention also uses a multi-way valve (preferably a two-position five-way valve), and a one-way valve, a pressure reducing valve, a throttle valve and a rod chamber and a rodless chamber of the cylinder to match the structure, so that gas can be introduced into the rod chamber or the rodless chamber through an external air circuit to drive the piston to apply different pressures to the pressure roller, including increasing pressure downward, reducing pressure, increasing pressure upward, reducing pressure upward, etc., so that the pressure roller can apply different pressures to the upper wire drawing drive roller, and further drive the pressure roller to apply different pressures to the raw silk on the wire drawing drive roller according to the raw silk specifications and the number of spinning positions to achieve the target oil application rate of the raw silk; that is, the pressure roller is controlled by a combination of pneumatic and electric methods to solve the problems of uneven pressure of multi-spinning position bundles, excessive pressure of the pressure roller that fails to reach the target oil application value, or a small adjustable range of oil application rate on multi-specification engineering preparation production lines in the existing pressure roller control method, so as to improve the uniformity of oil application of fibers at each spinning position, and by designing a multi-stage pressure roller combined with the oil concentration of the upper oil tank, the raw silk oil application rate of multi-specification raw silk production lines can be precisely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a structural schematic diagram of a raw silk preparation device with uniform oiling and adjustable oiling rate according to the present invention.

[0040] Figure 2 It is a structural schematic diagram of a pressure roller drive assembly + cylinder of a raw silk preparation device with uniform oiling and adjustable oiling rate according to the present invention.

[0041] Figure 3 It is a schematic diagram of the gas passage when the two-position five-way valve of the raw silk preparation device with uniform oiling and adjustable oiling rate is powered off.

[0042] Figure 4 It is a gas passage when the two-position five-way valve of the raw silk preparation device with uniform oiling and adjustable oiling rate is powered on.

[0043] Figure 5a It is a structural schematic diagram of a two-position five-way valve of the present invention.

[0044] Figure 5b It is a structural schematic diagram of the one-way valve of the present invention.

[0045] Figure 5c It is a structural schematic diagram of the throttle valve of the present invention.

[0046] The reference numerals are as follows:

[0047] 1. Upper oil tank; 2. Lower wire drawing drive roller; 3. Upper wire drawing drive roller; 4. Oil filter rod; 5. Pressing roller; 6. Pressing roller fixing device; 7. Cylinder assembly; 71. Cylinder; 71A. First cylinder; 71B. Second cylinder; 72. Piston rod; 73. Piston; 74. Rod chamber; 75. Rodless chamber; 81. Pressure reducing valve triplet; 82. Multi-way valve; 83. Pressure reducing valve; 83A. First pressure reducing valve; 83B. Second pressure reducing valve; 84. One-way valve; 84A. First one-way valve; 84B. Second one-way valve; 85. Throttle valve; 85A. First throttle valve; 85B. Second throttle valve; 85C. Third throttle valve; 85D. Fourth throttle valve; 86A. First pressure gauge; 86B. Second pressure gauge; 9. Motor; A. Pressing roller drive assembly; 10. Raw silk;

[0048] 11. First pipeline; 12. Second pipeline; 13. Third pipeline; 14. Fourth pipeline; 101. Knob; 102. Position sensor. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0052] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] like Figure 1-5cAs shown, the present invention provides a device for preparing a precursor (preferably a polyacrylonitrile-based precursor) with uniform oiling and adjustable oiling rate, which comprises:

[0056] A pressure roller 5 and a pressure roller driving assembly A, and an upper wire drawing transmission roller 3. The outer periphery of the upper wire drawing transmission roller 3 is provided with a movable raw yarn 10. The pressure roller 5 is located at the upper end of the upper wire drawing transmission roller 3 and can contact the raw yarn 10 to apply pressure to the raw yarn 10 on the upper wire drawing transmission roller 3. The pressure roller driving assembly A can drive the pressure roller 5 to apply different pressures to the upper wire drawing transmission roller 3 according to different specifications of the raw yarn 10 and the number of spinning positions, so as to ensure that the raw yarn 10 reaches the target oil application rate and the oil application rate is uniform between the spinning positions.

[0057] The present invention provides a pressure roller and a pressure roller driving assembly, wherein the pressure roller is located at the upper end of the upper wire drawing drive roller so as to apply pressure to the raw silk on the upper wire drawing drive roller, and the pressure roller driving assembly can drive the pressure roller to apply different pressures to the upper wire drawing drive roller according to the different specifications of the raw silk and the number of spinning positions, so as to ensure that the raw silk reaches the target oil application rate and the oil application rate is uniform among the spinning positions. This solves the problems that the existing pressure roller control method has uneven pressure on multi-spinning position bundles, or the pressure of the pressure roller has a small adjustable range for different raw silk specifications and the number of spinning positions, resulting in uneven oil application between fibers, or the fibers cannot reach the target oil application rate. This improves the uniformity of oil application on the fibers between the spinning positions and the adjustable range of the oil application on the multi-specification engineering preparation production line, thereby realizing the preparation of raw silk of multiple specifications on the production line.

[0058] The center material of the pressure roller of the present invention is preferably 304, 316 or 316L; the outer ring material is EPDM rubber or polyurethane rubber, and the surface roughness is Ra=0.10μm~0.40μm.

[0059] In some embodiments,

[0060] It also includes a cylinder assembly 7 and a pressure roller fixing device 6, the pressure roller 5 has a central axis, the pressure roller fixing device 6 is connected to the central axis, the cylinder assembly 7 includes a cylinder 71, a piston rod 72 and a piston 73, the piston 73 is located inside the cylinder 71, the upper end of the piston rod 72 is inserted into the cylinder 71 to be fixedly connected with the piston 73, the lower end of the piston rod 72 extends out of the cylinder 71 and is hinged to the pressure roller fixing device 6, so that a force can be applied to the pressure roller 5 through the pressure roller fixing device 6, and the pressure roller drive assembly A can control the piston 73 according to the different specifications of the raw silk 10 and the number of spinning positions to apply different pressures to the pressure roller 5.

[0061] The present invention also enables the pressure roller to apply different pressures to the raw yarn through the structure of the cylinder assembly and the pressure roller fixing device. The pressure roller fixing device is connected to the central axis of the pressure roller, and the lower end of the piston rod of the cylinder assembly is connected to the pressure roller fixing device, so that the piston can be driven to move up and down through the up and down movement of the piston, and then the piston is controlled to apply different pressures to the pressure roller according to different specifications of the raw yarn and different numbers of spinning positions, and the driving pressure roller applies different pressures to the upper wire drawing transmission roller, so as to obtain raw yarns with oiling rates that meet the standards for different specifications and different numbers of spinning positions.

[0062] In some embodiments,

[0063] The pressure roller drive assembly A includes a multi-way valve 82, a one-way valve 84, a pressure reducing valve 83 and a throttle valve 85. One end of the multi-way valve 82 can be connected to the air path, and the other end is connected to the one-way valve 84 or the pressure reducing valve 83. The one-way valve 84 is arranged in parallel with the pressure reducing valve 83. The other end of the one-way valve 84 or the pressure reducing valve 83 is connected to the throttle valve 85, and the throttle valve 85 is connected to the rod chamber 74 or the rodless chamber 75 of the cylinder 71. The rod chamber 74 is the piston rod. The cavity 72 is located and can move therein, the piston rod 72 is not provided in the rodless cavity 75, the cylinder 71 is arranged in the vertical direction, the rod cavity 74 is located at the lower end of the rodless cavity 75, and the lower end of the piston rod 72 extends out of the rod cavity 74 and is connected to the pressure roller fixing device 6, so that gases of different pressures can be introduced into the rod cavity 74 or the rodless cavity 75 to control the piston 73 to lift the pressure roller 5 or press down the pressure roller 5 or apply different pressures to the pressure roller 5.

[0064] The present invention also uses a multi-way valve, a one-way valve, a pressure reducing valve, a throttle valve and a rod chamber and a rodless chamber of the cylinder to match the structure, so that gas can be introduced into the rod chamber or the rodless chamber through an external air circuit to drive the piston to apply different pressures to the pressure roller, including increasing pressure downward, reducing pressure, increasing pressure upward, reducing pressure upward, etc., so that the pressure roller can apply different pressures to the upper wire drawing drive roller, and further drive the pressure roller to apply different pressures to the raw silk on the wire drawing drive roller according to the raw silk specifications and the number of spinning positions, so as to achieve the target oiling rate of the raw silk; that is, the pressure roller is controlled by a combination of pneumatic and electric methods to solve the problems of uneven pressure of multi-spinning position bundles, excessive pressure of the pressure roller that fails to reach the target oiling value, or a small adjustable range of oiling rate on a multi-specification engineering preparation production line in the existing pressure roller control method, so as to improve the uniformity of oiling of fibers at each spinning position, and by designing a multi-stage pressure roller combined with the oil concentration of the upper oil tank, the raw silk oiling rate of a multi-specification raw silk production line can be precisely controlled.

[0065] In some embodiments,

[0066] The one-way valve 84 includes a first one-way valve 84A and a second one-way valve 84B, and the pressure reducing valve 83 includes a first pressure reducing valve 83A and a second pressure reducing valve 83B.

[0067] The first pipeline 11, the second pipeline 12, the third pipeline 13 and the fourth pipeline 14 are also included. One end of the first pipeline 11 is connected to the multi-way valve 82, and the other end is connected to the rodless chamber 75 at the upper end of the cylinder 71. The first pressure reducing valve 83A is arranged on the first pipeline 11. The first check valve 84A is arranged on the second pipeline 12 and connected in parallel to the two ends of the first pressure reducing valve 83A. The first check valve 84A only allows the fluid to flow from the rodless chamber 75 to the multi-way valve 82.

[0068] One end of the third pipeline 13 is connected to the multi-way valve 82, and the other end is connected to the rod chamber 74 at the lower end of the cylinder 71. The second pressure reducing valve 83B is arranged on the third pipeline 13. The second one-way valve 84B is arranged on the fourth pipeline 14 and is connected in parallel to the two ends of the second pressure reducing valve 83B, and the second one-way valve 84B only allows fluid to flow from the rod chamber 74 to the multi-way valve 82.

[0069] This is the preferred structural form of the one-way valve and air path structure of the present invention, that is, the first pressure reducing valve is arranged on the first pipeline, the first one-way valve is arranged on the second pipeline in parallel with the first pressure reducing valve, the second pressure reducing valve is arranged on the third pipeline, and the second one-way valve is arranged on the fourth pipeline in parallel with the second pressure reducing valve. The intake air pressure can be adjusted through the first pipeline and enter the rodless chamber through a throttle valve direct (non-throttling) pipeline, drive the piston to move downward, and then drive the piston rod to drive the pressure roller downward, or further increase the downward pressure on the transmission roller, and the gas in the rod chamber is driven to flow out and flow out through the second one-way valve on the fourth pipeline; the intake air pressure is adjusted through the third pipeline and enters the rod chamber through a throttle valve direct (non-throttling) pipeline, reduce the pressure of the pressure roller on the transmission roller, or further drive the piston to move upward, and then drive the piston rod to drive the pressure roller upward, and the gas in the rodless chamber is driven to flow out and flow out through the first one-way valve on the second pipeline.

[0070] In some embodiments,

[0071] The air inlet end of the multi-way valve 82 is connected to the air inlet through the pressure reducing valve triplet 81. When the multi-way valve 82 is powered off, the multi-way valve 82 is connected to the third pipeline 13 inside the multi-way valve 82 after the air is inlet, and the gas is introduced into the rod chamber 74 of the cylinder 71 through the second pressure reducing valve 83B and the throttle valve 85B / 85D, and the piston 73 is controlled so that the pressure roller 5 reduces the downward pressure on the upper wire drawing drive roller 3. The throttle valve 85B / 85D under the gas passage keeps the gas straight without throttling.

[0072] When the multi-way valve 82 is energized, the multi-way valve 82 takes in air and then is connected to the first pipeline 11 inside the multi-way valve 82. The gas is introduced into the rodless chamber 75 of the cylinder 71 through the first pressure reducing valve 83A and the throttle valve 85A / 85C, and the piston 73 is controlled so that the pressure roller 5 increases the downward pressure on the upper wire drawing drive roller 3. The throttle valve 85A / 85C under the gas passage keeps the gas straight without throttling.

[0073] The present invention uses a multi-way valve to intake air at the intake end. When the power is off, the air is taken in through the third pipeline, and then enters the rod chamber after passing through the second pressure reducing valve direct pipeline, thereby exerting an upward force on the piston, reducing the downward pressure of the pressure roller on the transmission roller; or further pushing the piston to move upward, thereby driving the piston rod and the pressure roller to move upward, so that the pressure roller is lifted. When the power is on, the air is taken in through the first pipeline, and then enters the rodless chamber after passing through the first pressure reducing valve direct pipeline, thereby pushing the piston to move downward, thereby driving the piston rod and the pressure roller to move downward, so that the pressure roller is attached to the surface of the upper wire drawing transmission roller; or further increasing the downward pressure on the transmission roller.

[0074] In some embodiments,

[0075] When the multi-way valve 82 is switched from energized to de-energized, when the upward pressure exerted by the piston 73 on the pressure roller 5 is greater than the gravity of the pressure roller 5, the piston 73 can also move upward to drive the gas in the rodless chamber 75 to enter the second pipeline 12 through the throttle valve 85A / 85C, and be discharged through the multi-way valve 82 after passing through the first one-way valve 84A. The throttle valve 85A / 85C here can throttle the gas to adjust the speed of gas discharge in the rodless chamber 75, so as to accurately control the lifting speed of the piston rod 73, so that the two ends of the pressure roller 5 are synchronously lifted to the same position under the action of the cylinder piston rod 73;

[0076] When the multi-way valve 82 is switched from power-off to power-on, the piston 73 can also move downward to drive the gas in the rod chamber 74 to pass through the throttle valve 85B / 85D and then enter the fourth pipeline 14, and pass through the second one-way valve 84B and then be discharged through the multi-way valve 82. The throttle valve 85B / 85D here can throttle the gas to adjust the speed at which the gas in the rod chamber 75 is discharged, so as to accurately control the speed at which the piston rod 73 descends, so that the two ends of the pressure roller 5 are synchronously attached to the surface of the upper wire drawing drive roller 3 under the action of the cylinder piston rod 73, to prevent one end of the pressure roller 5 from first contacting the upper wire drawing drive roller 3, causing the upper wire drawing drive roller 3 to be unevenly stressed and overloaded and stop rotating.

[0077] The present invention performs air intake at the air intake end through a multi-way valve. When the power is switched off and the force applied by the gas pressure in the rod chamber is greater than the weight of the pressure roller, the piston is pushed upward to move the gas in the rodless chamber, and then enters the multi-way valve through the first one-way valve to be discharged. When the power is switched on, the piston is pushed downward to move the gas in the rod chamber, and then enters the multi-way valve through the second one-way valve to be discharged.

[0078] The throttle valve of the present invention is an exhaust type throttle valve. The gas passes through the straight-through channel ab of the throttle valve before entering the cylinder, and passes through the throttle channel ba of the throttle valve after exiting the cylinder (that is, the intake is straight-through, and the exhaust is exhausted after throttling). The throttle valve knob is adjusted to control the speed at which the gas in the cylinder is discharged through the throttle channel, thereby controlling the speed at which the cylinder piston rod is pushed out or retracted, and further controlling the speed at which the two sides of the pressure roller are lowered or lifted so that the two sides of the pressure roller can move synchronously, reducing the risk of the transmission roller stalling due to excessive torque caused by one side of the pressure roller contacting the transmission roller.

[0079] That is, the present invention can control the speed of the pressure roller being lifted up or pressed down by the exhaust speed of the throttle valve, thereby reducing the risk of the transmission roller stalling due to excessive torque.

[0080] In some embodiments,

[0081] The multi-way valve 82 is a two-position five-way valve, including ports: end a, end b, end c, end d and end e, where end a, d and e are located on one side of the two-position five-way valve, and end b and c are located on the other side of the two-position five-way valve, end a can be connected with end b and only allow fluid to flow from end a to end b, end e can be connected with end c and only allow fluid to flow from end c to end e, end a can also be connected with end c and only allow fluid to flow from end a to end c, and end d can also be connected with end b and only allow fluid to flow from end b to end d;

[0082] When the two-position five-way valve is powered off, end a is connected to end c, end b is connected to end d, one end of the third pipeline 13 is connected to end c, and one end of the second pipeline 12 can be connected to end b; when the two-position five-way valve is powered on, end a is connected to end b, end c is connected to end e, one end of the first pipeline 11 is connected to end b, and one end of the fourth pipeline 14 can be connected to end c.

[0083] This is the preferred structural form of the multi-way valve of the present invention, preferably a two-position five-way valve, which can achieve the effect and purpose of increasing the pressure of the rod chamber at the lower part of the piston by ventilating the piston to increase the pressure upward, thereby reducing the downward pressure of the pressure roller on the transmission roller, and can achieve the effect and purpose of increasing the downward pressure of the rodless chamber at the upper part of the piston by ventilating the piston to increase the downward pressure of the pressure roller on the transmission roller when the power is on.

[0084] In some embodiments,

[0085] It also includes an electric drive device, an upper oil tank body 1, a lower wire drawing drive roller 2 and an oil filter rod 4, the electric drive device includes a position sensor 102, a motor 9 and a knob 101, the position sensor 102 can detect the position relationship between the pressure roller 5 and the upper wire drawing drive roller 3, the motor 9 is connected to the pressure roller 5 to drive the pressure roller 5 to rotate or stop rotating, and the knob 101 can control whether the two-position five-way valve is in an energized state or in an off-state (preferably, when the knob is turned left, the motor is driven to rotate, and the two-position five-way valve is interlocked to energize after the motor rotates to the same speed as the upper wire drawing drive roller, and when the knob is turned right, the two-position five-way valve is energized. Control the two-position five-way valve to cut off the power); the lower wire drawing drive roller 2 is located below the upper wire drawing drive roller 3 and can draw the raw silk 10, the lower wire drawing drive roller 2 is located above the upper oil tank body 1, the oil filter rod 4 is located between the lower wire drawing drive roller 2 and the upper wire drawing drive roller 3, and the raw silk 10 passes through the two rods of the oil filter rod 4 in an "S"-shaped path, and the raw silk 10 passes through the upper oil tank body 1, the lower wire drawing drive roller 2, the oil filter rod 4 and the upper wire drawing drive roller 3 in sequence; and the oil filter rod 4 is a parallel double-rod structure, and the angle between the connecting line of the double rods and the extension direction of the raw silk 10 is 0-45°;

[0086] There are two cylinders 71, which are connected in parallel, including a first cylinder 71a and a second cylinder 71b, and a first throttle valve 85A is arranged on the pipeline connected to the rodless chamber at the upper end of the first cylinder 71a, a second throttle valve 85B is arranged on the pipeline connected to the rod chamber at the lower end of the first cylinder 71a, a third throttle valve 85C is arranged on the pipeline connected to the rodless chamber at the upper end of the second cylinder 71b, and a fourth throttle valve 85D is arranged on the pipeline connected to the rod chamber at the lower end of the second cylinder 71b.

[0087] The polyacrylonitrile-based raw silk preparation device with uniform and adjustable oiling of the present invention also includes an oiling tank body 1 and an oil agent replenishing circulation device. The upper oiling tank body 1 is provided with a lower wire drawing drive roller 2 and an upper wire drawing drive roller 3 on the wire outlet side. An oil filter rod 4 is provided in the middle of the upper and lower wire drawing drive rollers, and a pressure roller 5 is provided above the upper wire drawing drive roller 3. A pressure roller fixing device 6 is connected to each of the two ends of the central axis of the pressure roller. A first cylinder 71A and a second cylinder 71B are respectively provided above the two ends of the pressure roller. The telescopic end of the piston rod of the cylinder is preferably hinged to the pressure roller fixing device. The fixing device of the cylinder is hinged to the cylinder housing. The articulation method is used to compensate for the angle change caused by the corresponding pressure roller being lowered and lifted when the cylinder piston rod is extended and retracted. The drive motor is connected to the central axis of the pressure roller through a belt and a gear.

[0088] The pressure roller 5 is provided with a pressure roller driving assembly A and a cylinder assembly 7, and the pressure roller driving assembly includes an air circuit control assembly and a circuit control assembly.

[0089] The gas circuit control assembly includes a pressure reducing valve triplet 81, a two-position five-way valve 82, a single pressure reducing valve 83, a one-way valve 84, and a throttle valve 85. The two-position five-way valve is a single-coil two-position five-way valve; the single pressure reducing valve is connected to a pressure gauge; the one-way valve is connected in parallel with the single pressure reducing valve, and the gas passage of the one-way valve is ab, that is, from the cylinder to the two-position five-way valve, which is used to provide a passage for the gas in the cylinder to be discharged; the throttle valve is an exhaust throttle valve, and the gas enters the cylinder through the straight-through channel ab of the throttle valve, and passes through the throttle channel ba of the throttle valve when the gas is discharged from the cylinder. The throttle valve knob is adjusted to control the speed of the gas in the cylinder being discharged through the throttle channel, thereby controlling the speed of the cylinder piston rod being pushed out or retracted, and then controlling the speed of lowering or lifting both sides of the pressure roller to make the two sides of the pressure roller move synchronously, reducing the risk of the transmission roller stalling due to excessive torque caused by the contact between one side of the pressure roller and the transmission roller. The maximum pressure that the valve and the pressure gauge can withstand is ≥10 bar, and the accuracy of the pressure gauge is 0.1 bar, that is, the pressure regulation accuracy of a single pressure reducing valve is 0.1 bar.

[0090] The connection method of the air circuit control component is as follows: the external pressure air source is connected to the air inlet of the pressure reducing valve triplet; the outlet of the pressure reducing valve triplet is connected to the air inlet of the two-position five-way valve, so as to filter impurities in the compressed air and provide compressed air with stable pressure; when the two-position five-way valve is energized, its gas outlet is connected to the air inlet of a single pressure reducing valve, and the air outlet of the single pressure reducing valve is divided into two paths, which are respectively connected to the throttle valves of the rodless chambers of the two cylinders, and the gas in the rod chamber passes through the throttle valve of the rod chamber and converges into one path, and is discharged by the one-way valve and the two-position five-way valve; when the two-position five-way valve is de-energized, its gas outlet is connected to the air inlet of the single pressure reducing valve, and the air outlet of the single pressure reducing valve is divided into two paths, which are respectively connected to the throttle valve of the rod chamber of the cylinder, and the gas in the rodless chamber passes through the throttle valve of the rodless chamber and converges into one path, and is discharged by the one-way valve and the two-position five-way valve.

[0091] Furthermore, the circuit control component includes a motor 9, a knob 101, a position sensor 102, and a two-position five-way valve 82. The left and right rotation states of the knob are interlocked with the lifting and lowering actions of the pressure roller. When the knob is rotated to the left, the motor 9 is energized, and the pressure roller rotates. When the rotation speed of the pressure roller is consistent with that of the upper wire drawing transmission roller, the two-position five-way valve is interlocked to be energized, so that the pressure gas of the external pressure gas source enters the rodless cavity of the cylinder through the gas path control component, and forces the piston rod to drive the pressure roller to switch from the first state to the second state or the third state. After the rotation speed of the pressure roller is the same as that of the transmission roller, the pressure is pressed down again, which can reduce the friction caused by the speed difference to the wire bundle. The position sensor is used to sense the position change of the pressure roller. When the pressure roller switches from the first state to the second state after the two-position five-way valve is energized, that is, after the pressure roller and the transmission roller surface are in contact, the position sensor receives the pressure roller position signal and transmits the signal to the drive motor, and the drive motor stops working. When the knob is turned right, the two-position five-way valve is powered off, so that the pressure gas from the external pressure gas source enters the rod chamber of the cylinder through the gas path control component, and the piston rod drives the pressure roller to switch from the second state or the third state to the second state or the fourth state or the first state.

[0092] The present invention also provides a control method for a raw silk preparation device with uniform oiling and adjustable oiling rate as described above, which comprises:

[0093] Testing step, testing the specifications of the raw yarn and the number of spinning positions;

[0094] The control step is to control the pressure roller 5 to apply different pressures to the upper wire drawing drive roller according to the specifications of the raw silk and the number of spinning positions, and the position pressure state of the pressure roller 5 and the upper wire drawing drive roller 3 is in which of the following four states:

[0095] The first state is a state in which the pressure roller is completely separated from the upper wire drawing drive roller, that is, a state in which the pressure roller is lifted; the second state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is the pressure applied by the pressure roller's own weight; the third state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied to the upper wire drawing drive roller is greater than the pressure applied by the pressure roller's own weight; the fourth state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is less than the pressure applied by the pressure roller's own weight.

[0096] The present invention provides a polyacrylonitrile-based precursor preparation device and method with uniform and adjustable oiling. The pressure roller is controlled by a combination of pneumatic and electric means to solve the problems of uneven pressure of multi-spinning position bundles, excessive pressure of the pressure roller, failure to reach the target oiling value, or a small adjustable range of oiling rate on a multi-specification engineering preparation production line in the existing pressure roller control method, so as to improve the uniformity of oiling of fibers at each spinning position, and realize precise control of the oiling rate of the precursor of a multi-specification precursor production line by designing a combination of multi-stage pressure roller pressure and oil concentration in an oiling tank.

[0097] There are four position states of the pressure roller 5 and the upper wire drawing drive roller 3 of the present invention, including the first state, the second state, the third state, and the fourth state. The first state is the state in which the pressure roller is completely separated from the upper wire drawing drive roller, that is, the pressure roller is lifted up; the second state is the state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure P2 applied by the pressure roller to the upper wire drawing drive roller is the pressure applied by the pressure roller's own weight; the third state is the state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure P3 applied to the upper wire drawing drive roller is greater than the pressure applied by the pressure roller's own weight; the fourth state is the state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure P4 applied by the pressure roller to the upper wire drawing drive roller is less than the pressure applied by the pressure roller's own weight.

[0098] The present invention provides a device and method for preparing polyacrylonitrile-based precursor with uniform and adjustable oiling. A pneumatically controlled pressure roller device is used to achieve equal pressure at both ends of the oiling pressure roller, which can reduce the CV value (coefficient of variation, i.e., the discrete degree of the oiling rate between the spinning positions) of the precursor between the spinning positions, improve the uniformity of the oiling of the precursor between the spinning positions, and is conducive to the large-scale preparation of carbon fiber precursor; a pneumatic control device is used to achieve multi-stage adjustment of the pressure applied by the pressure roller to the transmission roller, which can achieve multi-range control of the precursor oiling rate, and is particularly suitable for a production line for the engineered preparation of multiple specifications of precursor (3K-48K). The pressure of the pressure roller can be adjusted according to the specifications of the running tow, so as to achieve precise control of the oiling rate of tows of different specifications.

[0099] In some embodiments,

[0100] In the first state, the two-position five-way valve is controlled to be powered off, and the force converted by the gas pressure allowed to pass through by the second pressure reducing valve 83B is greater than the weight of the pressure roller; in the second state, the two-position five-way valve is controlled to be powered on, and the gas pressure allowed to pass through by the first pressure reducing valve 83A is 0 bar, or the two-position five-way valve is controlled to be powered off, and the gas pressure allowed to pass through by the second pressure reducing valve 83B is 0 bar; in the third state, the two-position five-way valve is controlled to be powered on, and the pressure applied to the upper wire drawing drive roller is the pressure applied by the weight of the pressure roller + the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the first pressure reducing valve 83A, and the range is 0bar<extra pressure≤7bar; in the fourth state, the two-position five-way valve is powered off, and the pressure applied to the wire drawing drive roller is the pressure applied by the weight of the pressure roller - the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the second pressure reducing valve 83B, and the range is 0bar<extra pressure<1.5bar; the pressure applied by the weight of the pressure roller is in the range of 2-3bar.

[0101] The present invention uses the oiling device to realize a method for preparing polyacrylonitrile-based precursor with uniform and adjustable oiling. The tow after spinning, coagulation bath, water washing and hot drawing passes through the oiling tank 1, passes through the lower drawing drive roller 2, the oil filter rod 4, the upper drawing drive roller 3 and the pressure roller 5, and then undergoes drying, densification and steam drawing to form polyacrylonitrile-based precursor with uniform oiling rate. The specifications of the polyacrylonitrile-based fiber tows are 3K, 6K, and 12K, and the number of spinning positions of the 12K tows is ≤36 tows; the angle of the oil filter rod is 0-45°, and the tows pass through the oil filter rod in an "s"-shaped path; the oil concentration of the upper oil tank is 1%-5%, and the pressure range of the pressure roller is: the pressure applied by the weight of the pressure roller-the additional pressure (0-1.5bar) ≤ the pressure of the pressure roller ≤ the pressure applied by the weight of the pressure roller + the additional pressure (0-7bar); the oiling rate of the polyacrylonitrile carbon fiber precursor is 0.5-3%, the CV value of the oiling rate of each spinning position is ≤5%, and the long-range CV value of the oiling rate of a single spinning position is ≤2%.

[0102] The following is the gas circuit status when the two-position five-way valve is energized

[0103] Turn the knob of the pressure roller circuit to the left, the drive motor is powered on, and the pressure roller rotates. When the rotation speed of the pressure roller is consistent with that of the upper wire drawing transmission roller, the interlocked two-position five-way valve is powered on. When the solenoid valve is powered on, the rod chamber is converted from a gas inlet passage to a gas outlet passage, and the rodless chamber is converted from a gas outlet passage to a gas inlet passage. When the knob of a single pressure reducing valve 83A adjusts the pressure to 0, the cylinder piston rod is pushed out under the action of the pressure roller's own weight, and the gas in the rod chamber is discharged. The discharge passage is: the rod chamber of the first cylinder 71A / the second cylinder 71B → ba of the second throttle valve 85B / the fourth throttle valve 85D → the second one-way valve 84Ba-b → the two-position five-way valve ce → discharged into the atmosphere. When the pressure roller contacts the transmission roller surface, the pressure roller switches from the first state to the second state. At this time, the pressure of the pressure roller on the transmission roller is the pressure exerted by the weight of the pressure roller, which is 2 bar. At the same time, the position sensor receives the position state of the pressure roller and transmits the electrical signal to the pressure roller drive motor. The motor stops rotating, and the pressure roller changes from an active roller to a passive roller, and rotates synchronously with the transmission roller under the action of the friction force with the filament bundle.

[0104] On the basis of the above, the pressure entering the rodless chamber of the cylinder can be adjusted by rotating the knob of the single pressure reducing valve 83. When the pressure allowed to pass through the single pressure reducing valve 83 is greater than 0 bar, the pressure roller switches from the second state to the third state, and the path for gas to enter the cylinder is: gas source → pressure reducing valve triplet → two-position five-way valve ab → single pressure reducing valve 83 → first throttle valve 85A / third throttle valve 85C ab → rodless chamber of the first cylinder 71A / second cylinder 71B. The pressure allowed to pass through by the single pressure reducing valve can be displayed by the first pressure gauge 86A connected to its c port. When the knob is adjusted to a pressure of 1 bar, the pressure applied by the pressure roller to the transmission roller is 3 bar (i.e., the pressure applied by the weight of the pressure roller is 2 bar + additional pressure of 1 bar).

[0105] The following is the gas circuit status when the 2 / 5-way valve is powered off:

[0106] When the pressure of the single pressure reducing valve 83 is 0 bar and the pressure of the single pressure reducing valve 83 is 5 bar (i.e., the force applied to the pressure roller under this air pressure is greater than the weight of the pressure roller), the knob controlling the pressure roller circuit is turned right, the two-position five-way valve is powered off, and the path for gas to enter the cylinder is: gas source → pressure reducing valve triplet → two-position five-way valve ac → single pressure reducing valve 83 → ab of the second throttle valve 85B / fourth throttle valve 85D → rod chamber of the first cylinder 71A / second cylinder 71B, and the cylinder piston rod retracts. The gas in the rodless chamber is discharged, and its discharge path is: rodless chamber of the first cylinder 71A / second cylinder 71B → first throttle valve 85A / third throttle valve 85C ba of the first cylinder 71A / second cylinder 71B → first check valve 84A ab → two-position five-way valve bd → discharged into the atmosphere. The pressure roller is switched from the second state to the first state.

[0107] On the basis of the above, the pressure entering the rod chamber of the cylinder can be adjusted by rotating the knob of a single pressure reducing valve 83. When the pressure displayed by the second pressure gauge 86B connected to it is slightly less than 2 bar, the pressure roller begins to slowly fall until it contacts the transmission roller (that is, it indicates that the pressure applied to the transmission roller by the weight of the pressure roller is 2 bar). At this time, the pressure applied by the pressure roller to the transmission roller is about 0 bar (that is, the pressure applied by the weight of the pressure roller is 2 bar-the gas pressure is about 2 bar). Further, when the pressure displayed by the second pressure gauge 86B is 1 bar, the pressure applied by the pressure roller to the transmission roller is 1 bar (that is, the pressure applied by the weight of the pressure roller is 2 bar-1 bar). The above are all the switching of the pressure roller from the first state to the fourth state. Further, when the pressure displayed by the second pressure gauge 86B is 0 bar, the pressure applied by the pressure roller to the transmission roller is 2 bar (that is, the pressure applied by the weight of the pressure roller is 2 bar), and the pressure roller switches from the fourth state to the second state.

[0108] Or, when the pressure of the single pressure reducing valve 83 is 0 bar or less than 2 bar, the knob controlling the pressure roller circuit is turned right, the two-position five-way valve is powered off, and the pressure roller is switched from the second state to the fourth state.

[0109] Or, when the pressure of the single pressure reducing valve 83 is 0 bar or less than 0 bar, the knob controlling the pressure roller circuit is turned right, the two-position five-way valve is powered off, the pressure roller remains in the second state, but the gas passage is transformed.

[0110] Example 1

[0111] In this embodiment, polyacrylonitrile carbon fiber precursor with a specification of 3K is prepared, and the number of spinning positions is 60. The specific steps are as follows:

[0112] After passing through the booster pump, filter, and metering pump, the polyacrylonitrile solution is ejected from the spinneret hole to form a thin stream of stock solution, which is then solidified in a coagulation bath, washed, hot water drawn, oiled, dried and densified, steam drawn, and finally rolled up to prepare polyacrylonitrile fiber. The oil concentration in the upper oil tank is controlled at 4.0%, the deflection angle of the tow after the oil filter rod is 30°, the two-position five-way valve of the pressure roller air circuit control assembly is energized, and the pressure applied by the pressure roller to the transmission roller = the pressure applied by the weight of the pressure roller 2bar + the additional pressure 3bar = 5bar, and the oiling rate of the obtained raw silk is 1.4-1.6%.

[0113] Example 2

[0114] In this embodiment, polyacrylonitrile carbon fiber precursor with a specification of 12K is prepared, and the number of spinning positions is 30. The overall process is the same as that of Example 2, and the specific conditions of the upper oil tank are as follows: the concentration of the oil agent in the upper oil tank is controlled at 4.0%, the deflection angle of the tow passing through the oil filter rod is 15°, the two-position five-way valve of the pressure roller air circuit control assembly is energized, the pressure applied by the pressure roller to the transmission roller = the pressure applied by the weight of the pressure roller 2bar, and the oiling rate of the obtained precursor is 1.4-1.6%.

[0115] Example 3

[0116] In this embodiment, polyacrylonitrile carbon fiber precursor with a specification of 48K is prepared, and the number of spinning positions is 8. The overall process is the same as that of Example 2, and the specific conditions of the upper oil tank are as follows: the concentration of the oil agent in the upper oil tank is controlled at 4.0%, the deflection angle of the tow passing through the oil filter rod is 5°, the two-position five-way valve of the pressure roller air circuit control assembly is powered off, and the pressure applied by the pressure roller to the transmission roller = the pressure applied by the weight of the pressure roller 2bar-the additional pressure 0.5bar=1.5bar, and the oiling rate of the obtained precursor is 1.4-1.6%.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical principle of the present invention, several improvements and variations can be made, and any combination between the embodiments shall be regarded as the protection scope of the present invention.

Claims

1. A raw silk preparation device with uniform oiling and adjustable oiling rate, characterized in that: include: A pressure roller (5), a pressure roller driving assembly (A), and an upper wire drawing transmission roller (3); a raw yarn (10) capable of moving is arranged on the periphery of the upper wire drawing transmission roller (3); the pressure roller (5) is located at the upper end of the upper wire drawing transmission roller (3) and can contact the raw yarn (10) to apply pressure to the raw yarn (10) on the upper wire drawing transmission roller (3); the pressure roller driving assembly (A) can drive the pressure roller (5) to apply different pressures to the upper wire drawing transmission roller (3) according to different specifications and the number of spinning positions of the raw yarn (10), so as to ensure that the raw yarn (10) reaches the target oil application rate and the oil application rate is uniform.

2. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 1 is characterized in that: It also includes a cylinder assembly (7) and a pressure roller fixing device (6), wherein the pressure roller (5) has a central axis, and the pressure roller fixing device (6) is connected to the central axis. The cylinder assembly (7) includes a cylinder (71), a piston rod (72) and a piston (73), wherein the piston (73) is located inside the cylinder (71), and the upper end of the piston rod (72) is inserted into the inside of the cylinder (71) to be fixedly connected with the piston (73), and the lower end of the piston rod (72) extends out of the outside of the cylinder (71) and is hinged to the pressure roller fixing device (6) so that a force can be applied to the pressure roller (5) through the pressure roller fixing device (6), and the pressure roller driving assembly (A) can control the piston (73) according to different specifications of the raw silk (10) and the number of spinning positions to apply different pressures to the pressure roller (5).

3. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 2 is characterized in that: The pressure roller drive assembly (A) includes a multi-way valve (82), a one-way valve (84), a pressure reducing valve (83) and a throttle valve (85). One end of the multi-way valve (82) can be connected to the air path, and the other end is connected to the one-way valve (84) or the pressure reducing valve (83). The one-way valve (84) and the pressure reducing valve (83) are arranged in parallel. The other end of the one-way valve (84) or the pressure reducing valve (83) is connected to the throttle valve (85). The throttle valve (85) is then connected to the rod chamber (74) or the rodless chamber (75) of the cylinder (71). The rod chamber (74) is the A cavity in which a piston rod (72) is located and can move therein, the piston rod (72) is not provided in the rodless cavity (75), the cylinder (71) is arranged in the vertical direction, the rod cavity (74) is located at the lower end of the rodless cavity (75), and the lower end of the piston rod (72) extends out of the rod cavity (74) and is connected to the pressure roller fixing device (6) so that gases of different pressures can be introduced into the rod cavity (74) or the rodless cavity (75) to control the piston (73) to lift the pressure roller (5) or press down the pressure roller (5) or apply different pressures to the pressure roller (5).

4. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 3 is characterized in that: The one-way valve (84) includes a first one-way valve (84A) and a second one-way valve (84B), and the pressure reducing valve (83) includes a first pressure reducing valve (83A) and a second pressure reducing valve (83B). It also includes a first pipeline (11), a second pipeline (12), a third pipeline (13) and a fourth pipeline (14), one end of the first pipeline (11) is connected to the multi-way valve (82), and the other end is connected to the rodless chamber (75) at the upper end of the cylinder (71), the first pressure reducing valve (83A) is arranged on the first pipeline (11), the first check valve (84A) is arranged on the second pipeline (12) and is connected in parallel to both ends of the first pressure reducing valve (83A), and the first check valve (84A) only allows fluid to flow from the rodless chamber (75) to the multi-way valve (82); One end of the third pipeline (13) is connected to the multi-way valve (82), and the other end is connected to the rod chamber (74) at the lower end of the cylinder (71). The second pressure reducing valve (83B) is arranged on the third pipeline (13). The second one-way valve (84B) is arranged on the fourth pipeline (14) and is connected in parallel to both ends of the second pressure reducing valve (83B). The second one-way valve (84B) only allows fluid to flow from the rod chamber (74) to the multi-way valve (82).

5. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 4 is characterized in that: The air inlet end of the multi-way valve (82) is connected to the air inlet through the pressure reducing valve triplet (81). When the multi-way valve (82) is powered off, the multi-way valve (82) is connected to the third pipeline (13) inside the multi-way valve (82) after the air is taken in. The air is introduced into the rod chamber (74) of the cylinder (71) through the second pressure reducing valve (83B) and the throttle valve (85B / 85D). The piston (73) is controlled so that the pressure roller (5) reduces the downward pressure on the upper wire drawing drive roller (3). The throttle valve (85B / 85D) under the gas passage keeps the gas straight without throttling. When the multi-way valve (82) is energized, the multi-way valve (82) is connected to the first pipeline (11) inside the multi-way valve (82) after intake of air, and then introduced into the rodless chamber (75) of the cylinder (71) through the first pressure reducing valve (83A) and the throttle valve (85A / 85C), and the piston (73) is controlled so that the pressure roller (5) increases the downward pressure on the upper wire drawing drive roller (3), and the throttle valve (85A / 85C) under the gas passage keeps the gas straight without throttling.

6. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 5 is characterized in that: When the multi-way valve (82) is switched from energized to de-energized, when the upward pressure exerted by the piston (73) on the pressure roller (5) is greater than the gravity of the pressure roller (5), the piston (73) can also move upward to drive the gas in the rodless chamber (75) to pass through the throttle valve (85A / 85C) into the second pipeline (12), and pass through the first one-way valve (84A) and then be discharged through the multi-way valve (82). The throttle valve (85A / 85C) here can throttle the gas to adjust the speed of gas discharge in the rodless chamber (75) to accurately control the speed of the piston rod (73) lifting, so that the two ends of the pressure roller (5) are synchronously lifted to the same position under the action of the cylinder piston rod (73); When the multi-way valve (82) is switched from being powered on to being powered on, the piston (73) can also move downward to drive the gas in the rod chamber (74) to pass through the throttle valve (85B / 85D) and then enter the fourth pipeline (14), and then pass through the second one-way valve (84B) and then be discharged through the multi-way valve (82). The throttle valve (85B / 85D) here can throttle the gas to adjust the speed of gas discharge in the rod chamber (75) to accurately control the speed of the piston rod (73) descending, so that the two ends of the pressure roller (5) are synchronously attached to the surface of the upper wire drawing transmission roller (3) under the action of the cylinder piston rod (73).

7. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 5 or 6, characterized in that: The multi-way valve (82) is a two-position five-way valve, comprising ports: end a, end b, end c, end d and end e, end a, d and e are located on one side of the two-position five-way valve, end b and c are located on the other side of the two-position five-way valve, end a can be connected with end b and only allow fluid to flow from end a to end b, end e can be connected with end c and only allow fluid to flow from end c to end e, end a can also be connected with end c and only allow fluid to flow from end a to end c, end d can also be connected with end b and only allow fluid to flow from end b to end d; When the two-position five-way valve is powered off, end a is connected to end c, end b is connected to end d, one end of the third pipeline (13) is connected to end c, and one end of the second pipeline (12) can be connected to end b; when the two-position five-way valve is powered on, end a is connected to end b, end c is connected to end e, one end of the first pipeline (11) is connected to end b, and one end of the fourth pipeline (14) can be connected to end c.

8. The raw silk preparation device with uniform oiling and adjustable oiling rate according to claim 7 is characterized in that: It also comprises an electric drive device, an upper oil tank body (1), a lower wire drawing drive roller (2) and an oil filter rod (4), wherein the electric drive device comprises a position sensor (102), a motor (9) and a knob (101), wherein the position sensor (102) can detect the positional relationship between the pressure roller (5) and the upper wire drawing drive roller (3), the motor (9) is connected to the pressure roller (5) to drive the pressure roller (5) to rotate or stop rotating, and the knob (101) can control whether the two-position five-way valve is in an energized state or an off-power state; the lower wire drawing drive roller (2) is located at the upper wire drawing drive roller (3) and can pull the raw silk (10), the lower wire drawing drive roller (2) is located above the upper oil tank body (1), the oil filter rod (4) is located between the lower wire drawing drive roller (2) and the upper wire drawing drive roller (3), the raw silk (10) passes through the two rods of the oil filter rod (4) in an "S"-shaped path, and the raw silk (10) passes through the upper oil tank body (1), the lower wire drawing drive roller (2), the oil filter rod (4) and the upper wire drawing drive roller (3) in sequence; and the oil filter rod (4) is a parallel double-rod structure, and the angle between the connecting line of the double rods and the extension direction of the raw silk (10) is 0 to 45 degrees; There are two cylinders (71), which are connected in parallel, including a first cylinder (71a) and a second cylinder (71b), and a first throttle valve (85A) is arranged on the pipeline connected to the rodless chamber at the upper end of the first cylinder (71a), a second throttle valve (85B) is arranged on the pipeline connected to the rod chamber at the lower end of the first cylinder (71a), a third throttle valve (85C) is arranged on the pipeline connected to the rodless chamber at the upper end of the second cylinder (71b), and a fourth throttle valve (85D) is arranged on the pipeline connected to the rod chamber at the lower end of the second cylinder (71b).

9. A control method for a raw silk preparation device with uniform oiling and adjustable oiling rate as claimed in any one of claims 1 to 8, characterized in that: include: Testing step, testing the specifications of the raw yarn and the number of spinning positions; A control step, according to the specification of the raw silk and the number of spinning positions, controls the pressure roller (5) to apply different pressures to the upper wire drawing drive roller, and controls which of the following four states the position pressure state between the pressure roller (5) and the upper wire drawing drive roller (3) is in: The first state is a state in which the pressure roller is completely separated from the upper wire drawing drive roller, that is, a state in which the pressure roller is lifted; the second state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is the pressure applied by the pressure roller's own weight; the third state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied to the upper wire drawing drive roller is greater than the pressure applied by the pressure roller's own weight; the fourth state is a state in which the pressure roller is in contact with the upper wire drawing drive roller, and the pressure applied by the pressure roller on the upper wire drawing drive roller is less than the pressure applied by the pressure roller's own weight.

10. The control method according to claim 9, characterized in that: When the two-position five-way valve, the first pressure reducing valve (83A) and the second pressure reducing valve (83B) are included at the same time: In the first state, the two-position five-way valve is controlled to be powered off, and the force converted by the gas pressure allowed to pass through by the second pressure reducing valve (83B) is greater than the deadweight of the pressure roller; in the second state, the two-position five-way valve is controlled to be powered on, and the gas pressure allowed to pass through by the first pressure reducing valve (83A) is 0 bar, or the two-position five-way valve is controlled to be powered off, and the gas pressure allowed to pass through by the second pressure reducing valve (83B) is 0 bar; in the third state, the two-position five-way valve is controlled to be powered on, and the pressure applied to the upper wire drawing drive roller is equal to the pressure applied by the deadweight of the pressure roller + the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the first pressure reducing valve (83A), and the range is 0 bar < additional pressure ≤ 7 bar; in the fourth state, the two-position five-way valve is powered off, and the pressure applied to the wire drawing drive roller is equal to the pressure applied by the deadweight of the pressure roller - the additional pressure, and the additional pressure is the gas pressure allowed to pass through by the second pressure reducing valve (83B), and the range is 0 bar < additional pressure < 1.5 bar; The pressure applied by the deadweight of the pressure roller is in the range of 2-3 bar.

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