A polypropylene filament slit drafting device and a method for manufacturing the same

Abstract

The application provides a polypropylene filament slit drafting device and a preparation method thereof, a spinning beam, an air chamber arranged below the spinning beam, a drafting mechanism arranged below the air chamber, a paving machine arranged below the drafting mechanism, and a bottom air mechanism connected to the paving machine; the drafting mechanism comprises a top tractor, a filament separator connected below the tractor, a distribution pressure stabilizing box connected to the side of the filament separator, a drafting air duct symmetrically arranged in the middle of the filament separator and corresponding to the distribution pressure stabilizing box, and a compensation air duct symmetrically arranged below the filament separator. Through the arrangement of the air knife and the filament separator, the drafting effect of the polypropylene filament is strengthened; through the combined arrangement of the drafting air duct and the compensation air duct, the single filament strength of the polypropylene filament is strengthened; through the arrangement of the balancing box, the air inlet of the drafting air duct is stable and uniform; through the arrangement of the filter plate and the baffle, the air inlet is ensured to be pure and smooth; through the arrangement of the compensation air duct and the bottom air mechanism, the polypropylene filament is positioned and paved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of polypropylene filaments, and particularly relates to a polypropylene filament slit drafting device and a preparation method thereof. BACKGROUND

[0002] With the development of geotechnical materials, geotextiles or geogrids are made of polypropylene filaments, which have higher durability, drainage performance, and corrosion resistance, and greatly benefit the construction of existing slopes, highways, bridges, and airports. Existing polypropylene filaments are usually prepared by slit traction and stretching rollers, wherein the existing slit traction often encounters uneven cloth filaments, resulting in insufficient width, inconsistent gram weight between the two sides and the middle, and insufficient drafting force and chaotic falling position at the slit, which greatly causes the phenomena of narrow width, uneven gram weight, and insufficient drafting force of the formed polypropylene filaments. SUMMARY

[0003] The present application provides a polypropylene filament slit drafting device and a preparation method thereof to solve the technical problems of uneven distribution of drafting wind in the slit, adjustment of slit width, drafting compensation, and positioning of the existing slit drafting device.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A polypropylene filament slit drafting device, comprising a spinning box, a wind chamber arranged below the spinning box, a drafting mechanism arranged below the wind chamber, a paving machine arranged below the drafting mechanism, and a bottom wind mechanism connected to the paving machine;

[0006] The drafting mechanism is provided with a slit, and the polypropylene filaments are extruded from the spinning box, pass through the wind chamber to the slit, and then are laid on the paving machine;

[0007] The drafting mechanism comprises a top tractor, a filament separator connected below the tractor, a distribution pressure stabilizing box connected to the side of the filament separator, a drafting wind duct symmetrically arranged in the middle of the filament separator and corresponding to the distribution pressure stabilizing box, and a compensation wind duct symmetrically arranged below the filament separator;

[0008] An opening is arranged in the middle of the top surface of the tractor, and the opening is arranged corresponding to the extruded polypropylene filaments in the spinning box; the filament separator is two and oppositely arranged, the gap between the oppositely arranged is the slit, and the slit is arranged corresponding to the middle opening of the tractor;

[0009] The air knives on the two filament separators are oppositely and detachably arranged, the slit between the two air knives is wide at the top and narrow at the bottom, the top corresponds to the opening of the tractor, and the bottom corresponds to the slit between the two filament separators.

[0010] Further, the draft mechanism further comprises distribution branch pipes connected with the distribution steady pressure box respectively, air pressure pipelines connected with the distribution branch pipes respectively, main pipe connection pipes connected with the air pressure pipelines respectively, main pipe receiving pipes connected with the main pipe connection pipes respectively, main pipe branch pipes connected with the main pipe receiving pipes respectively, and a main pipe opening connected with the two main pipe branch pipes; the main pipe opening is connected with the air blowing fan.

[0011] Further, the filament separator comprises a top air knife, a main filament separator connected below the air knife, an air knife fixing rod connected between the air knife and the main filament separator, a balance box connected with the lateral side of the main filament separator, and a balance connecting box rod connected between the balance box and the main filament separator; the balance box and the main filament separator are provided with a draft air inlet.

[0012] Further, the gap between the two air knives is wide at the top and narrow at the bottom, the upper width is 30-50 mm, and the lower width is not more than 30 mm; the middle part of the two air knives is detachably connected with the filament separator through the air knife fixing rod; the height of the air knife and the filament separator is adjustable and corresponds to the height of the spinning beam.

[0013] Further, the draft air pipeline is arranged symmetrically in an eight-shaped form on the two main filament separators, and the pipeline gradually narrows on the side close to the gap, and the draft air pipeline opening is arranged downward or in the direction of the polypropylene filament.

[0014] Further, the compensation air pipeline is a straight hole, the compensation air pipeline is a pressure hole, and the air pressure on the side close to the gap is greater than that on the side far from the gap.

[0015] Further, the draft air pipeline is arranged in the length direction of the gap and is uniformly provided with the distribution branch pipes, the draft air pipeline gradually narrows from the outside to the gap in the direction perpendicular to the gap, and the narrow part is not more than 10 mm; the compensation air pipeline is horizontally and linearly arranged, and the height of the compensation air pipeline is equally arranged in the horizontal long direction and the horizontal short direction and is not more than 20 mm.

[0016] Further, the balance box comprises a balance main box, a balance air chamber arranged in the balance main box, a balance filter plate arranged below the balance air chamber, and a balance baffle plate arranged on the balance filter plate; the balance baffle plate is an arc-shaped plate, the arc-shaped plate separates the balance air chamber and the draft air pipeline, and the top of the arc-shaped plate extends into the top of the inlet of the draft air pipeline and is connected in sequence.

[0017] Further, the bottom air mechanism comprises an air outlet, a connecting interface arranged below the air outlet at intervals, a distribution pipe connected between each connecting interface, a distribution main pipe connected with the distribution pipe, and a fan pipe interface connected with the distribution main pipe; the fan pipe interface is connected with the air suction fan.

[0018] Further, the polypropylene filament gap draft device is manufactured according to the following specific steps:

[0019] Step one, metering extrusion of polypropylene filaments from the bottom of the spinning beam, and then the lateral cooling air is blown through the air chamber arranged on both sides, and the polypropylene filaments are shaped after the action of the cooling air and move downward under the influence of gravity;

[0020] Step two, the temperature of the cooling air is controlled at 20±3℃, and the air pressure is 0-7.0mbar; and the blowing is uninterrupted;

[0021] Step three, the polypropylene filaments moving downward enter the filament distributor through the inlet of the puller, and before this process, the slit width is adjusted through the air knife and the filament distributor, and the distribution constant pressure box is uniformly arranged along the length of the filament distributor, and the draft air uniformly distributed along the length of the slit is blown out;

[0022] Step four, the draft air uniformly distributed through the distribution branch pipe is blown into the slit downward, and the air volume of the draft air is set at 7000-14000m 3 / h, and the air pressure is 0.1-1bar;

[0023] Step five, the polypropylene filaments drawn through the draft air duct in the slit are compensated and pulled by the natural air at the compensation air duct;

[0024] Step six, the compensation air duct is directly connected to the outside, and the slit at the compensation air duct forms negative pressure due to the suction of the bottom air mechanism, thereby further pulling the polypropylene filaments;

[0025] Step seven, when the polypropylene filaments pulled integrally pass through the filament distributor and fall on the spreader, the bottom air mechanism is arranged at the slit of the filament distributor, and the distribution pipe is uniformly arranged in the bottom air mechanism, and the uniform distribution of the suction air is formed through the air outlet, and the negative pressure is formed by the suction of the suction air, and the landing point of the polypropylene filaments is accurately controlled by the compensation air, and then the spreading of the polypropylene filaments is formed.

[0026] Further, after the spreading of the polypropylene filaments (3) is formed, the spreading detection and calibration step is further included, which is specifically as follows:

[0027] The real-time characteristic parameters of the spreading area image of the polypropylene filaments (3) are collected, and compared with the standard characteristic parameters of the spreading area image stored in the system, if the real-time characteristic parameters of the spreading area image do not meet the predetermined range of the standard characteristic parameters of the spreading area image stored in the system, the spreading area coordinates of the polypropylene filaments in the inconsistent area range are recorded, and the distribution pipe (73) forms the uniform distribution of the suction air (11) through the air outlet (71), and the compensation air (10) calibrates and re-spreads the polypropylene filaments (3) in the spreading area of the polypropylene filaments in the inconsistent area range;

[0028] The paving area image real-time characteristic parameter is the brightness and chromaticity parameter of the paving area collected after the polypropylene filament is paved, and the paving area image standard characteristic parameter is the brightness and chromaticity parameter of the paving area collected after the polypropylene filament is uniformly paved, wherein, for the uniform paving condition, a set A = {A1, A2,..., An} is obtained, wherein An is the brightness sample L of the n-th paving uniform condition, and the value range of n is 1 to n, and n is the number of the brightness sample of the paving area collected under the uniform paving condition; and the standard parameter of the brightness sample L of the paving area is calculated through the following formula,

[0029] L(x) the function value of the standard parameter of the brightness sample L of the paving area, which is obtained by averaging the cumulative sum of the brightness sample Ai when the independent variable i takes all integer values from 1 to n, the set B = {B1, B2,..., Bn} is obtained for the chromaticity sample I of the paving area, wherein Bn is the chromaticity sample I of the n-th paving uniform condition, and the value range of n is 1 to n, and n is the number of the chromaticity sample of the paving area collected under the uniform paving condition; and the standard parameter of the chromaticity sample I of the paving area is calculated through the following formula,

[0030] I(x) the function value of the standard parameter of the brightness sample I of the paving area

[0031] , which is obtained by averaging the cumulative sum of the brightness sample Bi when the independent variable i takes all integer values from 1 to n.

[0032] The beneficial effects of the present application are embodied in:

[0033] 1) The present application controls the slit width by setting the air knife and the filament separator, respectively, forms a traction air duct through the narrow part after the upper polypropylene filaments are received, and strengthens the drafting effect of the polypropylene filaments;

[0034] 2) The present application further strengthens the single filament strength of the polypropylene filaments by the combined setting of the drafting air duct and the compensation air duct, wherein the compensation air duct does not need to be connected to the fan, and the traction is performed by the negative pressure formed by the through hole, the slit and the lower air;

[0035] 3) The present application is beneficial to ensure the smooth and uniform air intake of the drafting air duct by the setting of the balance box, and ensures the purity and smoothness of the air intake by the setting of the filter plate and the baffle;

[0036] 4) The present application is beneficial to further position and pave the polypropylene filaments by the setting of the compensation air duct and the bottom air mechanism, and the bottom air mechanism is beneficial to uniform air extraction and positioning by the setting of the distribution pipe, and is beneficial to the uniform paving of the polypropylene filaments.

[0037] 5) After the polypropylene filament is formed, the area image detection of the paving area can be detected through the paving detection calibration step, the uneven paving area can be directly adjusted by the computer system, the uniform paving of the polypropylene filament is further ensured, and the yield of the product is improved.

[0038] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application; the principal purpose of the application and other advantages will be achieved by means of the solutions specifically indicated in the description. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic diagram of the slit drafting device for manufacturing polypropylene filaments of the present application;

[0040] Figure 2 is a schematic diagram of the bottom air blowing mechanism structure of the present application;

[0041] Figure 3 is a schematic diagram of the drafting mechanism device of the present application;

[0042] Figure 4 is a schematic diagram of the air duct arrangement of the slit mechanism of the present application;

[0043] Figure 5 is a schematic diagram of the drafting air duct, the balance box and the connection thereof of the present application;

[0044] Figure 6 is a schematic diagram of the paving area image detection of the method embodiment of the present application.

[0045] The drawings show: 1 - spinning box, 2 - air chamber, 3 - polypropylene filament, 4 - slit, 5 - drafting mechanism, 51 - puller, 52 - distribution pressure stabilizing box, 521 - distribution pressure stabilizing box body, 522 - distribution pressure stabilizing box air inlet, 53 - filament distributor, 531 - air knife, 532 - air knife fixed rod, 533 - filament distribution main device, 534 - drafting air duct, 535 - compensation air duct, 536 - balance box, 5361 - balance main box, 5362 - balance air chamber, 5363 - balance filter plate, 5364 - balance baffle, 537 - drafting air inlet, 538 - balance connecting box rod, 54 - compressed air pipeline, 55 - distribution branch pipe, 56 - main pipe butt joint pipe, 57 - main pipe receiving pipe, 58 - main pipe branch pipe, 59 - main pipe port, 6 - paving machine, 7 - bottom air blowing mechanism, 71 - air outlet, 72 - butt joint, 73 - distribution pipe, 74 - distribution main pipe, 75 - fan pipe joint, 8 - cooling air, 9 - drafting air, 10 - compensation air, 11 - fixed suction air, 12 - mounting frame. DETAILED DESCRIPTION

[0046] The application discloses a polypropylene filament geotextile manufacturing method, and belongs to the field of geotextile manufacturing.

[0047] The polypropylene filament 3 is extruded from the spinning box 1, passes through the air chamber 2, and is laid on the paving machine 6.

[0048] In the embodiment, the drawing device 51 is arranged at the top of the drawing mechanism 5, the filament splitter 53 is arranged below the drawing device 51, the distribution pressure stabilizing box 52 is arranged at the side of the filament splitter 53, the drawing air duct 534 is symmetrically arranged in the middle of the filament splitter 53 and corresponds to the distribution pressure stabilizing box 52, and the compensation air duct 535 is symmetrically arranged at the lower part of the filament splitter 53.

[0049] In the embodiment, the middle part of the top surface of the drawing device 51 is provided with an opening, the opening corresponds to the extruded polypropylene filament 3 in the spinning box 1, the filament splitter 53 is arranged in two opposite positions, the gap between the two opposite positions is the slit 4, and the slit 4 corresponds to the opening in the middle of the drawing device 51.

[0050] In the embodiment, the filament splitter 53 comprises the air knife 531 arranged at the top, the filament main device 533 arranged below the air knife 531, the air knife fixed rod 532 arranged between the air knife 531 and the filament main device 533, the balance box 536 arranged at the outer side of the filament main device 533, and the balance connecting box rod 538 arranged between the balance box 536 and the filament main device 533.

[0051] In the embodiment, the air knives 531 on the two separating devices 53 are Y-shaped and detachably arranged, and can also be arranged in a stepped shape and a U shape. The slit 4 between the two air knives 531 is wide at the top and narrow at the bottom, the upper part corresponds to the opening of the drafting device 51, and the lower part corresponds to the slit 4 between the two separating main devices 533. The slit 4 between the two air knives 531 is wide at the top and narrow at the bottom, the upper part is the widest, and the width is 20-50 mm, and the lower part is the narrowest, and the width is 3-10 mm; the slit 4 between the two separating main devices 533 is not more than 10 mm, and in the embodiment, the slit 43 between the two air knives 531 is 10 mm. The single separating main device 533 is movably connected by a mechanism in the horizontal direction, and the two separating devices 53 are separately arranged when not working. The above structure and the related parameter setting can well improve the drafting force at the slit, and at the same time, it is beneficial to ensure the falling position regularity and reduce the phenomenon of chaotic falling of the filaments. The width of the polypropylene filaments formed thereby is improved, and the uniformity of the gram weight and the sufficient drafting force are ensured.

[0052] In the embodiment, the drafting air duct 534 is arranged symmetrically on the two separating main devices 533 in a figure-eight shape, and the air duct near one side of the slit 4 gradually narrows, and the air outlet of the drafting air duct 534 is arranged downward or in the direction in which the polypropylene filaments 3 travel. The compensation air duct 535 is a straight hole, the compensation air duct 535 is a pressure hole, and the air pressure near one side of the slit 4 of the compensation air duct 535 is greater than that away from the slit 4.

[0053] In the embodiment, the drafting air duct 534 is arranged in the length direction of the slit 4 and is correspondingly and uniformly provided with distribution branches 55. The drafting air duct 534 gradually narrows from the outside to the slit 4 in the direction perpendicular to the slit 4, and the narrow part is not more than 10 mm. The compensation air duct 535 is horizontally and linearly arranged, and the height of the compensation air duct 535 is equally set in the horizontal length direction and the short direction and is not more than 20 mm. The above structure and the related parameter setting can well improve the drafting force at the slit, and at the same time, it is beneficial to ensure the falling position regularity and reduce the phenomenon of chaotic falling of the filaments. The width of the polypropylene filaments formed thereby is improved, and the uniformity of the gram weight and the sufficient drafting force are ensured.

[0054] In the embodiment, the drafting mechanism 5 further comprises distribution branches 55 connected with the distribution pressure stabilizing box 52 respectively, air pressure pipelines 54 connected with the distribution branches 55 respectively, main pipe butt joints 56 connected with the air pressure pipelines 54 respectively, main pipe receiving pipes 57 connected with the main pipe butt joints 56 respectively, main pipe branch pipes 58 connected with the main pipe receiving pipes 57 respectively, and a main pipe opening 59 connected with the two main pipe branch pipes 58. The main pipe opening 59 is correspondingly connected with a blowing fan. The distribution branches 55 provide uniform air supply for the drafting air duct 534, and ensure the uniform drafting of the polypropylene filaments 3 in the horizontal length direction.

[0055] In addition, the balance box 536 comprises a balance main box 5361, a balance air chamber 5362 arranged in the balance main box 5361, a balance filter plate 5363 arranged below the balance air chamber 5362, and a balance baffle 5364 arranged on the balance filter plate 5363; the balance baffle 5364 is an arc-shaped plate, which separates the balance air chamber 5362 and the draft air duct 534, and the top of the arc-shaped plate extends into the top of the inlet of the draft air duct 534 and is connected in sequence.

[0056] In the embodiment, the bottom air mechanism 7 comprises an air outlet 71, a plurality of pair interfaces 72 arranged below the air outlet 71 in a spaced manner, a plurality of distribution pipes 73 connected between each pair of interfaces 72, a distribution main pipe 74 connected to the distribution pipes 73, and a fan pipe interface 75 connected to the distribution main pipe 74; the fan pipe interface 75 is connected to the air suction fan.

[0057] In combination with Figures 1 to 5 As shown, the polypropylene filament slit draft device is manufactured, and the specific steps are as follows:

[0058] Step one, the polypropylene filament 3 is metered and extruded at the bottom of the spinning box 1, cooled by the lateral cooling air 8 arranged on both sides of the air chamber 2, shaped after the action of the cooling air 8, and moves downward under the influence of gravity.

[0059] Step two, the temperature of the cooling air 8 is controlled at 20±3℃, and the air pressure is 0-7.0mbar; the blowing is continuous.

[0060] Step three, the polypropylene filament 3 moving downward enters the filament distributor 53 through the inlet of the traction device 51, and the slit width is adjusted by the air knife 531 and the filament distributor 53 before this process, and the distribution constant pressure box 52 is evenly arranged along the length direction of the filament distributor 53, and the draft air 9 uniformly distributed in the length direction of the slit 4 is blown out.

[0061] Step four, the air entering through the distribution branch pipe 55 forms the traction air uniformly distributed in the slit 4 and blows downward, and the air volume of the draft air 9 is 7000-14000m 3 / h, and the air pressure is 0.1-1bar.

[0062] Step five, the polypropylene filament 3 drafted through the draft air duct 534 in the slit 4 is compensated by the natural air at the compensation air duct 535.

[0063] Step six, the compensation air duct 535 is directly connected to the outside, and the slit 4 at the compensation air duct 535 forms negative pressure due to the suction effect of the bottom air mechanism 7, thereby further drafting the polypropylene filament 3; the air volume of the suction air is 90000m 3 / h. The adjustment range is 30%-70% of the air volume; the air volume of the suction air is determined comprehensively according to the falling height, gram weight, width, and other factors of the polypropylene filament 3.

[0064] Step seven, when the whole traction completed polypropylene filament 3 falls on the paver 6 after passing through the filament distributor 53, wherein the paver 6 is provided with a bottom air blowing mechanism 7 corresponding to the slit 4 of the filament distributor 53, and the bottom air blowing mechanism 7 is uniformly provided with distribution pipes 73, which form uniform distribution of the fixed suction air 11 through the air outlet 71, and the suction of the fixed suction air 11 forms negative pressure, which, in combination with the compensation air 10, accurately controls the landing point of the polypropylene filament 3, and then forms the paving of the polypropylene filament 3. After the processes of single filament reinforcement and uniform stretching and suction, the single filament longitudinal and transverse tension of the polypropylene filament 3 is similar, and the mechanical index is more than 30% of the general filament.

[0065] In a preferred embodiment, after the paving of the polypropylene filament 3 is formed, a paving detection and calibration step is further included, which is specifically as follows:

[0066] The image acquisition device installed on the equipment can acquire the real-time characteristic parameters of the paving area image of the polypropylene filament 3, and compare them with the standard characteristic parameters of the paving area image stored in the computer system. If the real-time characteristic parameters of the paving area image are consistent with the predetermined range of the standard characteristic parameters of the paving area image stored in the system, no calibration step is needed.

[0067] If not, record the paving area coordinates of the polypropylene filament in the inconsistent area range, and control the distribution pipes 73 to form uniform distribution of the fixed suction air 11 through the air outlet 71, and the compensation air 10 to calibrate and re-pave the polypropylene filament 3 in the paving area of the inconsistent area range, and then acquire the real-time characteristic parameters of the image of the paving area after paving again through the image acquisition device, to ensure the uniformity of the paving;

[0068] The real-time characteristic parameters of the paving area image are the brightness and chroma parameters of the paving area collected after the paving of the polypropylene filament. Since the brightness and chroma reflected by the uniformly paved polypropylene filament are uniform values within a certain error range, this method can be used for detection. For example, if the filaments are stacked, the related area may appear excessively dark in color and the light transmittance may decrease due to uneven stacking of the filaments. Therefore, the brightness and chroma range of the uniformly paved polypropylene filament in the uniformly paved area can be recorded to form standard parameter values, which are recorded in the computer system. Comparing the brightness and chroma values of the real-time paving area collected with the standard parameters can quickly detect whether the paving area of the polypropylene filament is uniformly paved, and the equipment can be adjusted for re-paving. In addition, in the case of uneven paving, the amount of related fixed suction air, compensation air, air outlet air power, etc. can be controlled and adjusted to reduce the occurrence of uneven paving in the next paving process.

[0069] The paving area image standard characteristic parameter is formed by collecting the brightness and chrominance parameters of the paving area under the condition of uniform paving of the polypropylene filaments. For the uniform paving condition, a set A = {A1, A2,..., An} of the brightness samples L of the paving area is obtained, where An is the brightness sample L of the n-th uniform paving condition, and n is in the range of 1 to n, and n is the number of the collected brightness samples of the paving area under the uniform paving condition. The standard parameter of the brightness sample L of the paving area is calculated by the following formula,

[0070] L(x) is the function value of the standard parameter of the brightness sample L of the paving area, which is obtained by averaging the cumulative sum of the brightness samples Ai when the independent variable i takes all integer values from 1 to n, where n = N.

[0071] The set B = {B1, B2,..., Bn} of the chrominance samples I of the paving area is obtained, where Bn is the chrominance sample I of the n-th uniform paving condition, and n is in the range of 1 to n, and n is the number of the collected chrominance samples of the paving area under the uniform paving condition. The standard parameter of the chrominance sample I of the paving area is calculated by the following formula,

[0072] I(x) is the function value of the standard parameter of the brightness sample I of the paving area, which is obtained by averaging the cumulative sum of the brightness samples Bi when the independent variable i takes all integer values from 1 to n, where n = N.

[0073] Therefore, when comparing the system data, only the chrominance value and the brightness value in the real-time characteristic parameter of the paving area image need to be compared with the chrominance sample and the brightness sample standard parameter I(x) and L(x) in the paving area image standard characteristic parameter. Furthermore, considering the actual situation and the error range of the controlled product, I(x) and L(x) can be a parameter range or some characteristic parameters, for example, some specific parameters represent a corresponding paving thickness of the polypropylene filaments, which can meet the special requirements of some products. For example, for the polypropylene filaments that meet the paving thickness within a certain range, all of them are qualified products. In this case, the values of I(x) and L(x) can be set to be within a certain error range, and the error range can be the range interval from the minimum I(x) and L(x) value to the maximum I(x) and L(x) value that meet the requirements of such products.

[0074] In Figure 6It is shown that, using the method of the embodiment of the application, a situation of the image detection calibration step of the paving area is carried out, D1-D4 represent different coordinate areas, in this example, each coordinate area is further divided into 4 subareas, and the D4 area is the paving area of the polypropylene filament out of range, in the D4 area, the case represented by R1 represents that the chroma value in the real-time characteristic parameter of the subarea does not meet the standard characteristic parameter, the case represented by R2 represents that both the chroma value and the brightness in the real-time characteristic parameter of the subarea meet the standard characteristic parameter, and the case represented by R3 represents that the brightness value in the real-time characteristic parameter of the subarea does not meet the standard characteristic parameter, therefore, in the case represented by R1 and R3, the polypropylene filament 3 in the paving area of the polypropylene filament out of range is calibrated by controlling the air distribution pipe 73 to form the uniform distribution of the air suction 11 through the air outlet 71 and combining the compensation air 10, and the D4 area is repaved, and after the repaving, the image of the paving area is collected again by the image collection device to compare the real-time characteristic parameters, so as to ensure the uniformity of the paving. Figure 5 After the polypropylene filament is formed and paved as shown, it is found by the paving detection calibration step that the chroma value and the brightness value in the D4 area do not meet the uniformity requirement of the paving, at this time, the polypropylene filament 3 in the paving area of the polypropylene filament out of range can be calibrated by controlling the air distribution pipe 73 to form the uniform distribution of the air suction 11 through the air outlet 71 and combining the compensation air 10, and the D4 area is repaved, and after the repaving, the image of the paving area is collected again by the image collection device to compare the real-time characteristic parameters, so as to ensure the uniformity of the paving.

[0075] The above-mentioned collection device can use an image collection device including a camera, and the data processing and communication can exist in various forms by using a general-purpose computer device, including a smart terminal with mobile communication function and mainly providing voice and data communication, and a terminal with online properties. Such terminals include, for example, personal computer devices, industrial calculator devices, and the like, which are only examples and not exhaustive.

[0076] The above-mentioned data processing and storage can also be provided by a server, i.e., a device providing computing services. The server is composed of a processor, a hard disk, a memory, a system bus, and the like, and has a similar structure to a general-purpose computer, but requires higher processing capacity, stability, reliability, security, scalability, and manageability than a personal computer, which are only examples and not exhaustive.

[0077] The above-mentioned only the preferred specific embodiments of the application, but the protection scope of the application is not limited to this, any person skilled in the art in the technical range disclosed by the application can think of changes or replacements, which should be covered in the protection scope of the application.

Claims

1. A polypropylene filament slot drafting device made by the process comprising: The device comprises a spinning beam (1), an air chamber (2) arranged below the spinning beam (1), a drafting mechanism (5) arranged below the air chamber (2), a spreader (6) arranged below the drafting mechanism (5), and a bottom air mechanism (7) connected to the spreader (6); The drafting mechanism (5) is provided with a slit (4), and the polypropylene filaments (3) are extruded from the spinning beam (1) and then spread on the spreader (6) through the air chamber (2) and the slit (4); The drafting mechanism (5) comprises a top traction device (51), a filament separator (53) connected below the traction device (51), a distribution pressure stabilizing box (52) connected to the side of the filament separator (53), a drafting air duct (534) symmetrically arranged in the middle of the filament separator (53) and corresponding to the distribution pressure stabilizing box (52), and a compensation air duct (535) symmetrically arranged below the filament separator (53); The middle of the top surface of the traction device (51) is provided with an opening corresponding to the extruded polypropylene filaments (3) in the spinning beam (1); the filament separator (53) is arranged oppositely, and the gap between the oppositely arranged filament separators is the slit (4) corresponding to the middle opening of the traction device (51); The air knives (531) on the two separating devices (53) are detachably arranged, the slit (4) between the two air knives (531) is wide at the top and narrow at the bottom, the upper part corresponds to the opening of the drafting device (51), and the lower part corresponds to the slit (4) between the two separating main devices (533), the drafting mechanism (5) further comprises distribution branch pipes (55) connected with the distribution constant pressure boxes (52) respectively, air pressure pipelines (54) connected with the distribution branch pipes (55) respectively, main pipe butt pipes (56) connected with the air pressure pipelines (54) respectively, main pipe receiving pipes (57) connected with the main pipe butt pipes (56) respectively, main pipe branch pipes (58) connected with the main pipe receiving pipes (57) respectively, and a main pipe port (59) connected with the two main pipe branch pipes (58) together; the main pipe port (59) corresponds to the air blower, the separating device (53) comprises the air knives (531) arranged at the top, the separating main devices (533) connected below the air knives (531), the air knife fixing rods (532) connected between the air knives (531) and the separating main devices (533), the balance boxes (536) connected to the outer sides of the separating main devices (533), and the balance connecting box rods (538) connected between the balance boxes (536) and the separating main devices (533); the drafting air inlet (537) is arranged between the balance boxes (536) and the separating main devices (533), the slit (4) between the two air knives (531) is wide at the top and narrow at the bottom, the upper part is 20-50mm wide, and the lower part is not more than 20mm wide; the middle part of the two air knives (531) is detachably connected with the separating device (53) through the air knife fixing rods (532), the slit (4) of the separating device (53) is not more than 10mm wide and is sequentially connected with the slit (4) between the air knives (531); the height of the air knives (531) and the separating device (53) corresponds to the height of the spinning beam (1) and is adjustably arranged, a single separating main device (533) is horizontally movably connected, and the two separating devices (53) are separately arranged when not working, The drafting air pipeline (534) is arranged in the length direction of the slit (4) and is uniformly arranged with the distribution branch pipes (55), the drafting air pipeline (534) gradually narrows from the outside to the slit (4) in the direction perpendicular to the slit (4), and the narrow part is not more than 10mm; the compensation air pipeline (535) is horizontally and linearly arranged, the compensation air pipeline (535) is equally high in the horizontal length direction and the horizontal short direction and is not more than 20mm high, Further, the image real-time characteristic parameters of the spreading area of the polypropylene filaments (3) are collected, the coordinates of the spreading area of the polypropylene filaments in the inconsistent area range are recorded, and the distribution pipe (73) forms uniform distribution of the fixed suction air (11) through the air outlet (71) to combine with the compensation air (10) to calibrate and re-spread the polypropylene filaments (3) in the spreading area of the polypropylene filaments in the inconsistent area range; The image real-time characteristic parameters of the spreading area are the brightness and chroma parameters of the spreading area collected after the polypropylene filaments are spread, The paving area image standard characteristic parameter is formed after collecting the brightness and chromaticity parameters of the paving area under the condition of uniform paving of the polypropylene filaments. For the uniform paving condition, a set A={A1, A2,..., An} of brightness samples L of the paving area is obtained, where An is the brightness sample L of the n-th uniform paving condition, and n is in the range of 1 to n, and n is the number of collected brightness samples of the paving area under the uniform paving condition. The standard parameter of the brightness sample L of the paving area is calculated by the following formula, L(x) a function value of the standard parameter of the luminance samples L of the paving area, which is obtained by averaging the cumulative sum of the luminance samples A, for all integer values of the argument i from 1 to n, A set B={B1, B2,..., Bn} of chromaticity samples I of the paving area is obtained, where Bn is the chromaticity sample I of the n-th uniform paving condition, and n is in the range of 1 to n, and n is the number of collected chromaticity samples of the paving area under the uniform paving condition. The standard parameter of the chromaticity sample I of the paving area is calculated by the following formula, I(x) a function value of the standard parameter of the luminance sample I of the paving area, which is obtained by averaging the cumulative sum of the luminance samples Bi when the independent variable i takes all integer values from 1 to n, When the system data is compared, only the chromaticity value and the brightness value in the real-time characteristic parameter of the paving area image and the chromaticity sample and the brightness sample standard parameter I(x) and L(x) in the paving area image standard characteristic parameter are compared. The balance box (536) includes a balance main box (5361), a balance air chamber (5362) arranged in the balance main box (5361), a balance filter plate (5363) arranged below the balance air chamber (5362), and a balance baffle (5364) arranged on the balance filter plate (5363). The balance baffle (5364) is an arc-shaped plate that separates the balance air chamber (5362) and the drafting air duct (534), and the top of the arc-shaped plate extends into the top of the inlet of the drafting air duct (534) and is connected in sequence.

2. A polypropylene filament slot drafting device as defined in claim 1, wherein, The drafting air duct (534) is arranged symmetrically on the two filament splitting main devices (533) in a figure-eight shape, and the air duct near one side of the slit (4) gradually narrows, and the air outlet of the drafting air duct (534) is arranged downward or in the direction of movement of the polypropylene filaments (3).

3. A polypropylene filament slot drafting device as defined in claim 2, wherein, The compensation air duct (535) is a straight-line-shaped hole, and the compensation air duct (535) is a pressure hole. The air pressure near one side of the slit (4) of the compensation air duct (535) is greater than that away from the slit (4).

4. A polypropylene filament slot drafting device as defined in claim 1 wherein, The bottom air mechanism (7) includes an air outlet (71), a butt joint interface (72) spaced apart and connected below the air outlet (71), a distribution pipe (73) connected between each butt joint interface (72), a distribution main pipe (74) connected to the distribution pipe (73), and a fan pipe interface (75) connected to the distribution main pipe (74); the fan pipe interface (75) is correspondingly connected to the air extraction fan.

5. A method of making polypropylene filaments according to any one of claims 1 to 4, characterized in that, The specific steps are as follows: Step one, the polypropylene filaments (3) are metered and extruded at the bottom of the spinning box (1), cooled by the lateral cooling air (8) arranged on both sides, shaped after the action of the cooling air (8), and moved downward under the influence of gravity; Step two, the temperature of the cooling air (8) is controlled at 20±3℃, and the air pressure is 0-7.0mbar; the blowing is continuous. Step three, the downward moving polypropylene filaments (3) enter the filament distributor (53) through the inlet of the puller (51), and before this process, the slit (4) width is adjusted by the air knife (531) and the filament distributor (53), and the distribution constant pressure box (52) is uniformly arranged along the length of the filament distributor (53), and the uniform draft air (9) in the length direction of the slit (4) is blown out; Step four, the air coming through the distribution branch (55) forms a uniform distribution of the draft in the slit (4) down blow, set draft (9) air volume 7000-14000m 3 / h, wind pressure is 0.1-1 bar; Step five, the polypropylene filaments (3) drawn by the draft air duct (534) in the slit (4) are compensated by natural wind at the compensation air duct (535); Step six, the compensation air duct (535) is directly connected to the outside world, and the slit (4) at the compensation air duct (535) forms negative pressure due to the suction of the bottom air mechanism (7), thereby further drawing the polypropylene filaments (3); Step seven, when the polypropylene filaments (3) that have completed the overall drawing pass through the filament distributor (53) and fall on the spreader (6), the spreader (6) is provided with a bottom air mechanism (7) corresponding to the slit (4) of the filament distributor (53), and the bottom air mechanism (7) is uniformly provided with a distribution pipe (73), the distribution pipe (73) forms uniform distribution of the constant suction air (11) through the air outlet (71), and the negative pressure is formed by the suction of the constant suction air (11), which accurately controls the landing point of the polypropylene filaments (3) in combination with the compensation air (10), and then forms the spreading of the polypropylene filaments (3), and after the spreading of the polypropylene filaments (3), it also includes a spreading detection and calibration step, which is as follows: Collect the real-time characteristic parameters of the spreading area image of the polypropylene filaments (3), and compare them with the standard characteristic parameters of the spreading area image stored in the system, if the real-time characteristic parameters of the spreading area image do not meet the predetermined range of the standard characteristic parameters of the spreading area image stored in the system, record the spreading area coordinates of the polypropylene filaments in the inconsistent area range, and control the distribution pipe (73) to form uniform distribution of the constant suction air (11) through the air outlet (71), and the compensation air (10) to calibrate and re-spread the polypropylene filaments (3) in the spreading area of the inconsistent area range; The real-time characteristic parameters of the spreading area image are the brightness and chroma parameters of the spreading area collected after the polypropylene filaments are spread, The standard characteristic parameters of the spreading area image are the brightness and chroma parameters of the spreading area collected after the polypropylene filaments are uniformly spread, wherein for the brightness sample L of the uniformly spread spreading area, a set A = {A1, A2,..., An} is obtained, where An is the brightness sample L of the n-th uniformly spread spreading area, and n is in the range of 1 to n, and n is the number of brightness samples of the uniformly spread spreading area collected; and the standard parameters of the brightness sample L of the spreading area are calculated by the following formula, L(x) a function value of the standard parameter of the luminance samples L of the paving area, which is obtained by averaging the cumulative sum of the luminance samples A; for all integer values of i from 1 to n, represented by the argument i, The chroma sample I of the spreading area is obtained by the following formula, B = {B1, B2,..., Bn}, where Bn is the chroma sample I of the n-th uniformly spread spreading area, and n is in the range of 1 to n, and n is the number of chroma samples of the uniformly spread spreading area collected; and the standard parameters of the chroma sample I of the spreading area are calculated by the following formula, I(x) a function value of the standard parameter of the luminance sample I of the paving area, which is obtained by averaging the cumulative sum of the luminance samples Bi when the independent variable i takes all integer values from 1 to n.

Images