Wet preparation method of ground glass fiber and double-roller type crushing device

Abstract

According to the wet preparation method for the ground glass fibers and the double-roller type crushing device, the surfaces of the pressing rollers in the used double-roller type crushing device are made of ceramic materials, the situation that metal friction chippings pollute the ground glass fibers is avoided, the circumferential surface of one pressing roller in the double-roller type crushing device is a tooth surface, cutting teeth are formed, and the grinding efficiency is improved. The cutting effect of the contact surface on the fibers is improved, the grinding effect of the contact surface on the fibers is reduced, shape damage to the fibers in the crushing process is reduced, and the crushing efficiency and the product quality can be improved. The vibrating screen classifier is internally provided with three layers of screen plates and is provided with the spraying mechanism, so that one-time grading screening of materials is achieved, and ground glass fiber materials are separated under the dual effects of washing of sprayed water flow and the vibrating screen. According to the method, continuous production can be achieved, the process is simple and practical, the length specification and the product quality of the ground glass fiber product are easy to control, and pollution and health hazards to the environment and workers caused by ground fiber dust are reduced.

Description

Technical Field

[0001] The invention relates to the field of new materials, in particular to a method for preparing ground glass fiber through a wet grinding process and a double-roller crushing device. Background Art

[0002] At present, the crushing equipment used for grinding glass fiber is mainly: hammer crusher and ball mill; the crushing process is mainly: slowly feeding the dry glass fiber material into the hammer crusher or ball mill for grinding, collecting the primary ground fiber material after crushing, and then through grading screening, acid washing to remove the iron impurities brought in by mechanical friction and other processing processes, finally obtaining the finished ground glass fiber.

[0003] The above production method has the following disadvantages: first, the dry glass fiber powder produced during the processing of dry glass fiber is easy to fly into the air, causing environmental pollution; second, the iron metal debris produced by the friction between the metal grinding parts of the crusher and the fiber will contaminate the ground fiber, and it is necessary to undergo acid washing to remove the metal impurities and contaminants brought in by mechanical friction; third, the hammer crusher and ball mill crusher are not easy to adjust the impact pressure and shear area of ​​the grinding parts on the material, which can easily cause excessive grinding of the glass fiber raw materials, resulting in the length of the ground glass fiber being difficult to control, the longitudinal surface shape of the fiber being easily damaged, and resulting in too many short fibers with a length of <30um. Therefore, these two crushing methods have the disadvantages of being unfavorable to environmental protection and having low product production efficiency and poor quality.

[0004] In the invention with publication number CN106733070A, a production method and a grinding device for ground glass fiber are disclosed. The invention grinds the glass fiber by a ball mill. Due to the grinding principle and equipment structure of the ball mill, the impact pressure and shear area of ​​the grinding balls on the glass fiber material cannot be accurately controlled, resulting in low production efficiency and poor product quality of the ground glass fiber products.

[0005] In the invention with application number CN202411043685.8, a wet chopped glass fiber dispersion device and dispersion method are proposed. The patent intends to produce a chopped glass fiber, which is different from the ground glass fiber described in this patent in that the length of the ground glass fiber product is generally controlled between 30 and 110 um, while the length of the chopped glass fiber product is usually controlled between 0.2 and 90 mm. The structure of the screening device and the water jetting method are different. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, such as difficulty in controlling the length of ground glass fibers, low yield, metal impurity pollution, and air pollution caused by ground glass fiber powder that is harmful to health, the present invention proposes a wet preparation method for ground glass fibers and a double-roll crushing device.

[0007] The specific process of the milled glass fiber prepared by the wet method proposed by the present invention is:

[0008] Step 1, preparing chopped glass fiber raw materials:

[0009] Cut the glass fiber raw material into short glass fibers with a length of 70 mm. Soak the short glass fiber raw material with deionized water and dehydrate it.

[0010] Step 2, raw material storage:

[0011] The obtained chopped glass fiber raw material is sent into a storage hopper for standby use.

[0012] Step 3, grinding the raw materials:

[0013] The chopped glass fiber raw materials in the storage hopper are sent out through the quantitative discharging mechanism, and the chopped glass fiber raw material baffle plate enters the feed port of the double-roll crusher. The chopped glass fiber raw materials are squeezed and cut by the three-layer ceramic pressure rollers and ground into primary ground glass fiber materials.

[0014] When grinding the ingredients:

[0015] When the diameter of the grinding roller is 85 mm, the working length of the grinding roller is 125 mm, and the rotation speed of the grinding roller is 32 rpm, the working efficiency of the double-roll crusher is 1.8 kg / hour.

[0016] When the diameter of the grinding roller is 150 mm, the working length of the grinding roller is 300 mm, and the rotation speed of the grinding roller is 66 rpm, the working efficiency of the double-roll crusher is 20 kg / hour.

[0017] When the diameter of the grinding roller is 400 mm, the working length of the grinding roller is 810 mm, and the rotation speed of the grinding roller is 135 rpm, the working efficiency of the double-roll crusher is 120 kg / hour.

[0018] During the grinding of the raw materials, the pressure between the three groups of grinding rollers is adjusted according to the specifications of the raw materials and the finished product specifications; the diameter range of the glass fiber raw materials is 7 to 9 μm, the length of the finished ground fiber is 30 to 110 μm, and when the fiber diameter is coarser and the length specification of the ground fiber finished product is longer, the grinding roller speed should be increased and the pressure between the grinding rollers should be reduced; when the fiber diameter is finer and the length specification of the ground fiber finished product is shorter, the grinding roller speed should be reduced and the pressure between the grinding rollers should be increased.

[0019] When grinding the ingredients:

[0020] When the diameter of the glass fiber is 7um, the finished glass fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~200 rpm, the pressure between the grinding rollers is 7~12Mpa, and the yield rate is>75%;

[0021] When the diameter of the glass fiber is 7um, the finished product of the ground fiber is: 55μm≤length range≤110μm, the grinding roller speed range should be <350 rpm, the pressure between the grinding rollers is 4-6Mpa, and the yield rate is >75%;

[0022] When the fiber diameter is 9um and the finished product of the ground fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~180 rpm, the pressure between the grinding rollers is 8~14Mpa, and the yield rate is>75%;

[0023] When the fiber diameter is 9um and the finished ground fiber is 55μm≤length range≤110μm, the grinding roller speed range is 180~400 rpm, the pressure between the grinding rollers is 5~7Mpa, and the yield is >75%.

[0024] Step 4, screening:

[0025] The chopped glass fiber raw materials are crushed by the double-roll crusher and discharged from the primary ground glass fiber discharge port, and are sent into the collecting hopper through the feed port of the collecting hopper via the conveyor belt. After the quantitative discharging mechanism adjusts the feeding direction through the primary ground glass fiber material baffle plate, they enter the vibrating screening machine for screening.

[0026] After the primary ground glass fiber material is screened by the vibrating screening machine, it is screened into 4 levels according to the different fiber lengths. The first-level ground glass fiber material is separated from the first-layer discharge port, and its material length is >110μm; the second-level ground glass fiber material is separated from the second-layer discharge port, and its: 80μm≤material length≤110μm; the third-level ground glass fiber material is separated from the third-layer discharge port, and its: 30μm≤material length<80μm; the ground glass fiber and spray water separated by the first three levels of sieve plates are gathered into the fourth-layer cavity of the vibrating screening machine. The fourth-level cavity is below the third-pole sieve plate and is separated from the fourth-layer discharge port, and its material length is <30μm.

[0027] Ground glass fiber particles are obtained.

[0028] For the first-stage ground glass fiber material after screening by the vibrating screening machine, if it does not meet the average length requirement of the ground glass fiber, it will be collected and the excess water will be removed by a spin dryer, and then sent to the storage hopper and ground again in the grinding stage.

[0029] The second-stage ground glass fiber material and the third-stage ground glass fiber material screened by the vibrating screening machine are respectively dried, dehydrated, dried and packaged for standby use.

[0030] If the fourth-stage ground glass fiber material after screening by the vibrating screening machine does not meet the average length requirement of the ground glass fiber, the mixture of the material and the spray water will flow out through the fourth-stage discharge port and merge into the sedimentation tank. After the material is precipitated, the upper layer of clear water and the lower layer of precipitated material are separated to obtain the precipitated material. After drying, the precipitated material can be used as a resin reinforcement material with low requirements on product performance, or as a glass fiber raw material to be re-melted and drawn into glass fiber raw material for use.

[0031] The roller grinding device includes a roller grinding machine, a vibrating screen, a quantitative discharging mechanism, a spray mechanism and a conveyor belt. Among them, there is a storage hopper above the feed port of the roller grinding machine; the discharge port of the roller crusher corresponds to the feed end of the conveyor belt; the discharge end of the conveyor belt corresponds to the feed port of the quantitative discharging mechanism; the discharge port of the quantitative discharging mechanism corresponds to the feed port of the vibrating screen; the rotating main shaft in the spray mechanism is located on the upper part of the first layer of the screen plate of the vibrating screen, and the spray mechanism is fixed by an external mechanical arm with a bearing as a card point, and is fixed to the upper part of the vibrating screen with a matching gap between the vibrating screen and the vibrating screen, and there is no direct contact; a water pipe rotary joint is installed at the top of the rotating main shaft, and the water pipe rotary joint is connected to an external water source; each layer of the screen plate is connected to a discharge port, and each discharge port is located outside the housing of the vibrating screen.

[0032] The feed port of the double-roll crusher is vertically connected to the discharge port of the chopped fiber storage hopper, and there are reserved matching gaps above and below the docking point, and the spacing between the matching gaps is 200-400mm; there is a baffle plate in the matching gap to adjust the direction of material travel, and the baffle plate is used to prevent material overflow and adjust the angle of material entering the feed port of the double-roll crusher.

[0033] A quantitative discharging mechanism is arranged in the discharging port of the storage hopper, and the rotating speed of the quantitative discharging mechanism is adjusted to realize the uniform speed feeding of the chopped glass fiber raw material to the roller crusher.

[0034] The vibrating screening machine has four layers of chambers from top to bottom, wherein the first to third layers of chambers are respectively provided with sieve plates, namely, the first layer of sieve plate located in the first layer of chamber, the second layer of sieve plate located in the second layer of chamber, and the third layer of sieve plate located in the third layer of chamber.

[0035] The first layer of the sieve plate of the vibration screening machine corresponds to the discharge port, the mesh size of the sieve plate is 140-160 meshes, and the length of the intercepted ground glass fiber material is >110 μm.

[0036] The second sieve plate of the vibration screening machine corresponds to the discharge port, the mesh size of the sieve plate is 180-200 meshes, and the intercepted ground glass fiber material has a length specification of 80 μm≤≤110 μm.

[0037] The third sieve plate of the vibrating screening machine corresponds to the discharge port, and the mesh size is 440-480 meshes, and the intercepted ground glass fiber material has a length specification of 30 μm ≤ < 80 μm.

[0038] Each discharge port is connected to a material packing bag; each packing bag is fixed to each discharge port by a ring clamp;

[0039] The fourth chamber of the vibrating screening machine corresponds to the discharge port, and the mixture of the ground glass fiber material and the spray water separated from the first three layers of the sieve plates flows out from the discharge port, wherein the length of the ground glass fiber material is less than 30 μm, and the mixed material at the discharge port is guided by a plastic hose into the ground glass fiber material sedimentation tank, which is used to separate the upper clear water and the lower sedimentation material;

[0040] The spray mechanism includes a rotating main shaft, a pair of spray pipe assemblies and a rotating joint; the rotating joint is installed at the top of the rotating main shaft to provide the rotating main shaft with deionized circulating water with a pressure of 0.15 to 0.5 MPa; the rotating main shaft is a hollow tube, and its inner hole forms a passage for spraying water in the spray mechanism; one end of the two spray pipes in the spray pipe assembly is symmetrically installed on the outer circumferential surface of the rotating main shaft; a nozzle is installed at the end of each spray pipe, and the length of the spray pipe is 1 / 2 of the radius of the screen.

[0041] The roller crusher includes three groups of grinding rollers, which are the first group of grinding rollers, the second group of grinding rollers and the third group of grinding rollers from top to bottom, and the first group of grinding rollers are coarse grinding rollers, and the second group of grinding rollers and the third group of grinding rollers are fine grinding rollers; the three groups of grinding rollers each include two rollers, and the circumferential surface of one grinding roller is a smooth surface, and the circumferential surface of the other grinding roller is a tooth surface, and the tooth surface forms the cutting teeth of the grinding roller; the tooth pitches of the cutting teeth of the three groups of grinding rollers from top to bottom are 1mm, 0.5mm and 0.15mm respectively. The center distance between the two adjacent groups of grinding rollers is 15-50mm.

[0042] The diameter of each grinding roller is 85-500 mm, the working length is 100-1000 mm, and the rotation speed is 28-350 rpm.

[0043] The surface material of the grinding roller of the double-roll crusher is a high-hardness ceramic arc pressure plate, and the inner core is an alloy steel inner core; the surface of the grinding roller of the double-roll crusher is a ceramic arc pressure plate and the inner core is an alloy steel inner core, the diameter of the pressure roller is the diameter of the ceramic arc pressure plate and the alloy steel inner core combined, the combined diameter is 85 to 500 mm, the arc surface thickness of the ceramic arc pressure plate is 30 to 105 mm, and the diameter of the steel inner core is 55 to 395 mm.

[0044] Two chopped glass fiber raw material baffles are arranged on both sides of the feed port of the double-roll crusher. The length is the same as the pressure roller of the double-roll grinder and the width is 100-350mm. By adjusting the angle of the baffles on one side or both sides, the chopped glass fiber raw material can smoothly enter the feed port of the double-roll crusher.

[0045] The quantitative discharging mechanism comprises a polygonal pressing tube and a speed regulating motor; the cross section of the pressing tube is a 5-12-sided polygon; the two ends of the pressing tube are fixed on both sides of the discharge port of the storage hopper through bearings; one end of the pressing tube is connected to the speed regulating motor, the diameter of the circumscribed circle of the pressing tube is 60-150 mm, and a groove with a width of 10-30 mm, a depth of 5-30 mm, and a length equal to that of the pressing tube is opened at 1.5-20 mm from both sides of each angular line of the pressing tube; by adjusting the rotation speed of the pressing tube and the matching clearance between the pressing tube and the outer shell baffle below the storage hopper bin, the chopped yarn material is evenly pushed out of the storage hopper in a manner of 0.5-5 mm in thickness, 100-1000 mm in width, and a travel speed of 180-370 mm per minute;

[0046] The quantitative discharging mechanism of the collecting hopper includes a polygonal pressing tube and a speed regulating motor. The cross section of the pressing tube is a 6-10-sided polygon. The two ends of the pressing tube are fixed on both sides of the collecting hopper discharge port through bearings, and there is a gap between the pressing tube and the silo shell baffle of the collecting hopper discharge port; one end of the pressing tube is connected to the speed regulating motor, the diameter of the circumscribed circle of the pressing tube is 60-120 mm, and a groove with a width of 5-15 mm, a depth of 5-10 mm, and a length equal to that of the pressing tube is opened 3-15 mm from both sides of each edge line of the pressing tube. By adjusting the rotation speed of the pressing tube and adjusting the matching gap between the pressing tube and the inner wall baffle of the silo wall below the collecting hopper, the primary ground glass fiber material can be discharged at a speed of 1.8-120 kg / hour and enter the feed port of the vibrating screening machine at a uniform speed.

[0047] The technical feature of the present invention is that a double-roll crusher is used to grind the glass fiber. The grinding principle is the same as that of a conventional double-roll grinder. The working principle is to cut and grind the glass fiber raw material based on the extrusion and friction between two counter-rotating pressure rollers. However, the structure of the double-roll grinder described in the present invention has similarities and differences with that of a conventional grinder.

[0048] The structure of the double-roller grinding machine designed in the present invention is similar to that of the conventional double-roller grinding machine in that: the structure supporting the machine body, the discharge plate for controlling the discharge of the material, the cooling system for maintaining the stable operation of the machine body, the multi-roller pressure roller structure, the material baffle plate for preventing the raw material from overflowing, the electrical control system for controlling the start and stop and the speed of operation, the transmission system for driving the pressure rollers to rotate, the buffer spring for adjusting the pressure between the pressure rollers, and other structures are the same.

[0049] The rollers of the double-roll crusher in the prior art are made of carbide steel. If it is used to crush glass fiber raw materials, the metal friction debris on the surface of the grinding roller will contaminate the ground glass fiber products. The roller surface of the double-roll crusher proposed in the present invention is made of ceramic material to prevent metal friction debris from contaminating the ground glass fiber; at the same time, in each group of grinding rollers of the double-roll crusher designed by the present invention, one roller is a flat cylindrical roller and the other roller is a toothed cylindrical roller. Compared with the combination of double-plane rollers or double-toothed rollers, the combination of toothed rollers and flat rollers can reduce the contact area between the rollers, thereby reducing the contact area between the rollers and the glass fiber material, thereby increasing the cutting effect of the contact surface on the fiber, reducing the grinding effect of the contact surface on the fiber, reducing the shape damage caused to the fiber during the crushing process, and improving the crushing efficiency and product quality; the first group of three groups of grinding rollers from top to bottom is a coarse grinding roller, and the second and third groups are fine grinding rollers.

[0050] The vibrating screening machine of the present invention has three layers of sieve plates and a spray mechanism is arranged inside the vibrating screening machine to achieve one-time grading and screening of materials. The ground glass fiber materials are separated under the dual effects of the spraying water flow and the vibration of the vibrating screen.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The present invention realizes the continuous crushing process by adopting a double-roll crusher, so that continuous production can be carried out. The process is simple and practical, and the length specification and product quality of the ground glass fiber products are easy to control. The ceramic texture of the grinding roller of the double-roll crusher will not rub against the glass fiber to produce iron metal debris to contaminate the ground glass fiber, thereby reducing the pickling process flow, having higher work efficiency, and being more economical and environmentally friendly. At the same time, the glass fiber is in a wet state during the entire production process, and the fiber powder will not or rarely fly into the air to generate glass fiber powder dust, thereby reducing the pollution and health hazards caused by the ground fiber dust to the environment and workers.

[0053] Ground glass fiber, also known as glass fiber powder, is a ground glass fiber product obtained by crushing glass fiber raw yarn with a crushing equipment. According to the provisions of JC / T 556-2005 on the average length of ground glass fiber, the average length of the finished ground glass fiber should meet the length range of 30 to 110 μm. When observed under a microscope, its surface should be a complete cylindrical glass fiber product.

[0054] The present invention has conducted three different pulverizers to produce grinding effect tests of glass fiber products, and the test materials and test equipment are as follows:

[0055] Glass fiber raw materials for testing: alkali-free glass fiber: fiber diameter 9μm, linear density 50tex.

[0056] Crushing equipment:

[0057] Hammer crusher: Model: 5E-CD-180×150, manufacturer: Changsha Kaiyuan Instrument Co., Ltd., the crushing hammer is made of alloy steel.

[0058] Ball mill: Model: Mz03-3L, manufacturer: Shandong Elpa Powder Technology Co., Ltd., grinding balls and grinding chamber are made of ceramic.

[0059] Roller crusher: The principle and structure of the roller crusher are the same as those of the existing roller crusher. The grinding rollers are different from the existing equipment. They are self-developed ceramic pressure plates and alloy steel inner core nested structures. The specific parameters are: Number of rollers: three groups of 6 rollers; roller diameter 220mm; roller working length:

[0060] 660mm; speed: 55r / min, overall dimensions: 1585*1320*1150mm.

[0061] Testing equipment: laser particle size analyzer, model: BT-9300, manufacturer: Dandong Better Instrument Co., Ltd.

[0062] The particle size test results are as follows:

[0063] Table 1: Test results of particle size range percentage of ground glass fiber products made by three grinding mills

[0064]

[0065]

[0066] Note: In Table 1:

[0067] d: indicates the particle length of the fiber;

[0068] D1: represents the percentage of the length of the particle size range of the ground glass fiber produced by the hammer crusher;

[0069] D2: represents the percentage of the length of the particle size range of the ground glass fiber produced by the ball mill;

[0070] D3: represents the percentage of the length of the particle size range of the ground glass fiber produced by the roller crusher;

[0071] Meaning of interval content (%): The larger the interval content percentage value, the greater the number of particles of milled glass fiber of this length within the length interval, and vice versa;

[0072] Selection of test data: Due to the different structures of the three crushing equipment, this test result only selects parameters such as crushing time and glass fiber raw material feeding amount for different crushing equipment after multiple adjustments, and uses the test data with better grinding effect as the test result for comparison.

[0073] Analysis of particle size test results: According to the provisions of JC / T 556-2005 on the average length of ground glass fiber, the average length of the finished ground glass fiber should meet the length range requirements of 30 to 110 μm. In Table 1: for the ground glass fibers produced by hammer crusher and ball mill, the number of ground glass fiber particles that do not meet the length range requirements accounted for 75.07% and 76.89%, and the number of ground glass fiber particles that meet the length range requirements accounted for 24.63% and 23.11%, respectively. For the ground glass fibers produced by double-roll crusher, the number of ground glass fiber particles that do not meet the length range requirements accounted for 20.83, and the number of ground glass fiber particles that meet the length range requirements accounted for 79.17%.

[0074] When compared with the qualified rate of finished ground glass fibers, the qualified rate of ground glass fiber products produced by hammer crushers and ball mills is relatively low compared with that of double-roll crushers. Due to the different crushing principles and structures of the three crushers, the first two devices cannot cut and crush the glass fibers to a fixed length, and the degree of crushing of the glass fibers needs to be determined according to the grinding time. Too long a time may easily cause excessive grinding of the glass fibers, while too short a grinding time may cause incomplete crushing of the glass fibers. During the grinding process, a large area of ​​the glass fibers are subjected to the extrusion and impact damage of the grinding hammers or grinding balls in the longitudinal direction, which is the main reason why the length of the glass fibers is difficult to control and the appearance and shape are seriously damaged. However, double-roll crushers can cut and crush the glass fibers to a fixed length, and the shear pressure during crushing is adjustable. The length distribution range of the primary ground glass fibers produced is narrow and uniform, and the proportion of ground glass fibers that meet the requirements after screening is large. Therefore, these reasons are the main reasons why the production efficiency of the double-roll crusher described in the present invention is higher than that of the hammer crusher and the ball mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 It is a schematic diagram of the structure of the grinding device, wherein the arrow indicates the circulating movement route of the ground glass fiber material with a length >110.0μm.

[0076] Figure 2This is the test result of the particle size distribution of ground glass fiber produced by a hammer crusher. The horizontal axis in the figure represents the particle size length, in μm; the left vertical axis represents the cumulative distribution percentage of particle size, and the right vertical axis represents the difference distribution percentage.

[0077] Figure 3 This is the test result of the particle size distribution of ground glass fiber produced by a ball mill. The horizontal axis in the figure represents the particle size length, in μm; the left vertical axis represents the cumulative distribution percentage of particle size, and the right vertical axis represents the difference distribution percentage.

[0078] Figure 4 This is the particle size distribution test result of the ground glass fiber of the roller crushing mechanism. The horizontal axis in the figure represents the particle length, the unit is: μm; the left vertical axis represents: the cumulative distribution percentage of the particle size, and the right vertical axis represents the difference distribution percentage.

[0079] Figure 1 In: 1. Storage hopper; 2. Roller crusher; 3. Conveyor belt; 4. Collecting hopper; 5. Vibrating screen; 7. Discharge port for first-stage milled fibers; 8. Discharge port for second-stage milled fibers; 9. Discharge port for third-stage milled fibers; 10. Discharge port for fourth-stage milled fibers; 11. Quantitative discharge mechanism for storage hopper; 12. Quantitative discharge mechanism for collecting hopper; 13. First set of rollers; 14. Second set of rollers; 15. Third set of rollers; 16. Discharge port for roller crusher; 17 Water pipe swivel joint; 18. Spray pipe; 19. Vibrating motor ; 20. Rotating main shaft; 21. First layer of sieve plate; 22. Second layer of sieve plate; 23. Third layer of sieve plate; 24. Baffle plate for chopped glass fiber raw material; 25. Feed port of collecting hopper; 26. Feed port of double-roll crusher; 27. Feed port of vibration screening machine; 28. Baffle plate for primary ground glass fiber material; 29. ​​Test results of particle size distribution of ground glass fiber produced by hammer crusher; 30. Test results of particle size distribution of ground glass fiber produced by ball mill; 31. Test results of particle size distribution of ground glass fiber produced by double-roll crushing mechanism. DETAILED DESCRIPTION

[0080] This embodiment is a method for preparing ground glass fiber by wet method, and the specific process is:

[0081] Step 1, preparing chopped glass fiber raw materials:

[0082] The preparation of the chopped glass fiber raw material is to cut the glass fiber raw material with a length greater than 70 mm into chopped glass fibers with a length of 70 mm. This process is a necessary condition to ensure that the quantitative discharging mechanism 11 inside the storage hopper 1 can stably push the chopped glass fiber raw material in the storage hopper 1. Its purpose is to prevent the chopped glass fiber raw material from being entangled on the discharging pressure pipe of the quantitative discharging mechanism due to the excessive length of the fiber bundle.

[0083] The chopped glass fiber raw material is soaked with deionized water, and then the spin dryer removes excess water brought into the chopped glass fiber raw material to obtain chopped glass fiber raw material that is easy to disperse and has humidity. The degree of wetness of the chopped glass fiber raw material should be determined according to the discharging effect of the quantitative discharging mechanism 11 on the chopped glass fiber. If the water content of the chopped glass fiber raw material is too high, it will cause the chopped glass fiber raw material to be difficult to disperse and discharge, and the dehydration time of the spin dryer should be increased; if the water content of the chopped glass fiber raw material is too low, it will cause the chopped glass fiber raw material to be too dry, and the fiber powder will easily float into the air during the grinding process to cause dust pollution, and the dehydration time of the spin dryer should be reduced.

[0084] Step 2, raw material storage:

[0085] The soaked chopped glass fiber raw material is fed into the storage hopper 1 for standby use; the storage capacity of the storage hopper 1 is 80-500 kg.

[0086] The method of feeding the storage hopper 1 can be automatic feeding or manual feeding. The amount of feeding should be determined according to the working efficiency of the double-roll crusher. During the operation of the equipment, the amount of chopped glass fiber raw materials stored in the storage hopper 1 should not be less than 1 / 3 of the total amount of storage in the storage hopper 1.

[0087] Step 3, grinding the raw materials:

[0088] The chopped glass fiber raw material in the storage hopper 1 is sent out through the quantitative discharging mechanism 11, and the chopped glass fiber raw material baffle plate 24 enters the feed port 26 of the double-roll crusher. The chopped glass fiber raw material is squeezed and cut by three layers of ceramic rollers 13, 14, and 15, and is ground into primary ground glass fiber material.

[0089] The feed speed and thickness of the chopped glass fiber raw material should be adjusted according to the working efficiency of the roller grinder, and ensure that there is no material accumulation between the three rollers of the roller grinder. The feed speed adjustment device is controlled by the quantitative discharging mechanism 11.

[0090] The typical relationship between the working efficiency of the double-roll crusher 2 and the equipment specifications and working parameters is as follows:

[0091] When the diameter of the grinding roller is 85 mm, the working length of the grinding roller is 125 mm, and the rotation speed of the grinding roller is 32 revolutions / min, the working efficiency of the double-roll crusher 2 is 1.8 kg / hour.

[0092] When the diameter of the grinding roller is 150 mm, the working length of the grinding roller is 300 mm, and the rotation speed of the grinding roller is 66 rpm, the working efficiency of the double-roll crusher 2 is 20 kg / hour.

[0093] When the diameter of the grinding roller is 400 mm, the working length of the grinding roller is 810 mm, and the rotation speed of the grinding roller is 135 rpm, the working efficiency of the double-roll crusher 2 is 120 kg / hour.

[0094] The pressure adjustment between the three groups of grinding rollers of the roller crusher 2 should be determined according to the specifications of the raw materials and the finished products. Generally, the diameter of the glass fiber raw material is required to be between 7 and 9 μm, and the length of the finished ground fiber is required to be between 30 and 110 μm.

[0095] When the fiber diameter is coarser and the length specification of the ground fiber product is longer, the grinding roller speed should be increased and the pressure between the grinding rollers should be reduced; when the fiber diameter is finer and the length specification of the ground fiber product is shorter, the grinding roller speed should be reduced and the pressure between the grinding rollers should be increased. The finished product rate of ground glass fiber should be more than 75% of the mass of glass fiber raw materials, otherwise the pressure between each group of grinding rollers and the speed of grinding rollers of the double-roll crusher 2 should be adjusted. The pressure between each group of grinding rollers can be adjusted by a buffer spring, and the speed of the grinding roller can be adjusted by adjusting the speed of the power motor of the double-roll crusher 2. The grinding roller and the motor are driven at the same speed through a fixed-axis gear set.

[0096] The finished product specifications and typical operating parameters of the double-roll crusher 2 are as follows:

[0097] When the diameter of the glass fiber is 7um, the finished glass fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~200 rpm, the pressure between the grinding rollers is 7~12Mpa, and the yield rate is>75%;

[0098] When the diameter of the glass fiber is 7um, the finished product of the ground fiber is: 55μm≤length range≤110μm, the grinding roller speed range should be <350 rpm, the pressure between the grinding rollers is 4-6Mpa, and the yield rate is >75%;

[0099] When the fiber diameter is 9um and the finished product of the ground fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~180 rpm, the pressure between the grinding rollers is 8~14Mpa, and the yield rate is>75%;

[0100] When the fiber diameter is 9um and the finished ground fiber is 55μm≤length range≤110μm, the grinding roller speed range is 180~400 rpm, the pressure between the grinding rollers is 5~7Mpa, and the yield is >75%.

[0101] Step 4, screening:

[0102] The chopped glass fiber raw material is crushed by the double-roll crusher 2 and discharged from the primary ground glass fiber discharge port 16. The discharged primary ground glass fiber material is sent into the collecting hopper 4 from the collecting hopper feed port 25 via the conveyor belt 3. A quantitative discharge mechanism 12 is provided at the bottom of the collecting hopper 4. The primary ground glass fiber material is pushed out of the collecting hopper 4 by the quantitative discharge mechanism 12, and finally enters the vibrating screening machine 5 for screening after the feeding direction is adjusted by the primary ground glass fiber material baffle plate 28.

[0103] After the primary ground glass fiber material is screened by the vibrating screening machine 5, it is screened into four levels according to the different fiber lengths. The first-level ground glass fiber material is separated from the first-layer discharge port 7, and its material length is >110μm; the second-level ground glass fiber material is separated from the second-layer discharge port 8, and its: 80μm≤material length≤110μm; the third-level ground glass fiber material is separated from the third-layer discharge port 9, and its: 30μm≤material length<80μm; the ground glass fiber and spray water separated by the first three levels of sieve plates are gathered into the fourth-layer cavity of the vibrating screening machine. The fourth-level cavity is below the third-pole sieve plate 23 and is separated from the fourth-layer discharge port 10, and its material length is <30μm.

[0104] The first-stage ground glass fiber material after screening by the vibration screening machine 5 has a material length of >110μm, which does not meet the average length requirement of ground glass fiber specified in JC / T556-2006. It should be collected and removed with a spin dryer to remove excess moisture, and then manually sent to the storage hopper 1 and ground again in the grinding stage.

[0105] The second-stage ground glass fiber material after screening by the vibration screening machine 5 has the following characteristics: 80μm≤material length≤110μm, and the third-stage ground glass fiber material has the following characteristics: 30μm≤material length<80μm, which meet the average length requirement of ground glass fiber specified in JC / T556-2006. They should be spun-dried, dehydrated, dried, and packaged respectively, and the finished products can be used as commodities.

[0106] The fourth-stage ground glass fiber material after screening by the vibration screening machine 5 has a material length d<30μm, which does not meet the average length requirement of ground glass fiber specified in JC / T556-2006. The collection method is: the material and the spray water mixture flows out through the fourth-stage discharge port and merges into the sedimentation tank together. After the material is precipitated, the upper layer of clear water and the lower layer of precipitated material are separated. The obtained precipitated material is dried and used as a resin reinforcement material with low requirements on product performance, or is re-melted and drawn as a glass fiber raw material for use as a glass fiber raw material.

[0107] At this point, the preparation of glass fiber particles is completed.

[0108] In order to implement the wet method for preparing glass fiber particles, the present invention also provides a double-roller grinding device.

[0109] The roller grinding device includes a roller grinding machine 2, a vibrating screening machine 5, a quantitative discharging mechanism 12, a spray mechanism and a conveyor belt 3. Among them, there is a storage hopper 1 above the feed port of the roller grinding machine. The discharge port 16 of the roller crusher corresponds to the feed end of the conveyor belt; the discharge end of the conveyor belt corresponds to the feed port of the quantitative discharging mechanism. The discharge port of the quantitative discharging mechanism corresponds to the feed port 27 of the vibrating screening machine. The rotating main shaft 20 in the spray mechanism is located on the upper part of the first layer of the sieve plate of the vibrating screening machine. The spray mechanism is fixed by an external mechanical arm with the bearing as a card point. It is fixed to the upper part of the vibrating screening machine with a matching gap between it and the vibrating screening machine, and there is no direct contact; a water pipe rotary joint 17 is installed at the top of the rotating main shaft, and the water pipe rotary joint is connected to an external water source; each layer of the sieve plate is connected to a discharge port, and each discharge port is located outside the housing of the vibrating screening machine.

[0110] The spray mechanism includes a rotating main shaft 20, a group of spray pipe assemblies and a rotary joint 17; the rotary joint adopts a BE type water pipe rotary joint, which is installed at the top of the rotating main shaft and can provide the rotating main shaft with deionized circulating water with a pressure of 0.15 to 0.5 MPa; the rotating main shaft is a hollow tube, and its inner hole forms a passage for spraying water in the spray mechanism; the group of spray pipe assemblies are two spray pipes on both sides of the rotating main shaft 20; nozzles are installed at the ends of the two spray pipes, and the length of the spray pipe is 1 / 2 of the radius of the screen.

[0111] The feed port of the double-roll crusher 2 is vertically connected to the discharge port of the chopped fiber storage hopper 1, and there are reserved matching gaps above and below the matching gaps, and the spacing between the matching gaps is 200-400mm; there is a baffle plate 24 in the matching gap for adjusting the direction of material travel, which prevents material overflow and adjusts the angle of the material entering the feed port 26 of the double-roll crusher 2.

[0112] The roller crusher 2 is improved from the prior art, and the improvement is that the roller crusher includes three groups of grinding rollers, which are the first group of grinding rollers, the second group of grinding rollers and the third group of grinding rollers from top to bottom, and the first group of grinding rollers are coarse grinding rollers, and the second group of grinding rollers and the third group of grinding rollers are fine grinding rollers; the three groups of grinding rollers each include two rollers, and the circumferential surface of one grinding roller is a smooth surface, and the circumferential surface of the other grinding roller is a tooth surface, and the cutting teeth of the grinding rollers are formed by the tooth surface; the tooth pitches of the cutting teeth of the three groups of grinding rollers from top to bottom are 1mm, 0.5mm and 0.15mm respectively. The center distance between the two adjacent groups of grinding rollers is 15 to 50mm; the power transmission method between the grinding rollers adopts technology.

[0113] The improvement also lies in that the grinding roller in the prior art is made of hard alloy steel material, while the roller of this embodiment is made of ceramic material.

[0114] The surface material of the grinding roller of the double-roll crusher 2 is a high-hardness ceramic arc pressure plate, and the inner core is an alloy steel inner core; the surface of the grinding roller of the double-roll crusher 2 is a ceramic arc pressure plate and the inner core is an alloy steel inner core, the diameter of the pressure roller is the diameter of the combination of the ceramic arc pressure plate and the alloy steel inner core, the combined diameter is 85 to 500 mm, the arc surface thickness of the ceramic arc pressure plate is 30 to 105 mm, and the diameter of the steel inner core is 55 to 395 mm.

[0115] A quantitative discharging mechanism 11 is provided in the discharging port of the storage hopper 1 , and the rotating speed of the quantitative discharging mechanism is adjusted to achieve uniform feeding of the chopped glass fiber raw material to the roller crusher 2 .

[0116] The quantitative discharging mechanism 11 includes a polygonal pressing tube and a speed regulating motor; the pressing tube is cylindrical, with a cross section of 5 to 12 polygons, and is made of aluminum or stainless steel; the two ends of the pressing tube are fixed on both sides of the discharge port of the storage hopper 1 through bearings, the longitudinal direction of the pressing tube is parallel to the opening direction of the discharge port, its length is equal to the width of the discharge port of the storage hopper 1, and it is ensured that there is a gap between it and the silo opening shell baffle of the discharge port of the storage hopper 1, and the gap should ensure that the primary ground glass fiber material does not overflow, and the gap should also ensure that when the pressing tube rotates, the material can be uniformly brought out by the pressing tube from the gap between the silo shell baffle and the pressing tube below the storage hopper 1; one end of the pressing tube is connected to the speed regulating motor, and the connection between the pressing tube and the speed regulating motor is a gear or a pulley, and the speed regulating motor can adjust the multiple The rotation speed of the angular pressing tube is such that the diameter of the circumscribed circle of the pressing tube is 60 to 150 mm, a groove with a width of 10 to 30 mm and a depth of 5 to 30 mm and a length equal to the length of the pressing tube is opened 1.5 to 20 mm from both sides of each angular line of the pressing tube, the length range of the pressing tube is 100 to 1000 mm, the length of the pressing tube is equal to or less than the length of the pressing roller of the roller grinder, the pressing tube rotates at a uniform speed in the counterclockwise direction, the speed is 0 to 180 revolutions / min, and by adjusting the rotation speed of the pressing tube and the matching clearance between the pressing tube and the outer shell baffle below the hopper 1, the chopped yarn material is uniformly pushed out of the storage hopper 1 in a manner of 0.5 to 5 mm in thickness, 100 to 1000 mm in width, and a travel speed of 180 to 370 mm per minute;

[0117] Two chopped glass fiber raw material baffles 24 are provided on both sides of the feed port of the double-roll crusher 2. The length is the same as that of the roller of the double-roll grinder and the width is 100-350 mm. One end of the baffles 24 is fixed to both sides of the feed port of the double-roll crusher 2 by tightening screws. By adjusting the angle of the baffles on one or both sides, the chopped glass fiber raw material can smoothly enter the feed port of the double-roll crusher 2. The feed port of the double-roll crusher 2 is located above the contact point of the roller surface of the first group of rollers.

[0118] The roller crusher 2 is provided with three groups of rollers, with a total of 6 grinding rollers, 2 rollers in each group, from top to bottom: the first group of pressure rollers 13, the second group of pressure rollers 14, and the third group of pressure rollers 15; one grinding roller in each group of rollers is a flat roller, and the other grinding roller is a toothed roller. The diameters of the 6 grinding rollers are the same, and the diameter of the flat roller is the same as the diameter of the circumscribed circle of the toothed roller.

[0119] The diameter of the grinding roller is in the range of 85 to 500 mm, the working length is in the range of 100 to 1000 mm, and the rotation speed is in the range of 28 to 350 rpm. The larger the diameter of the grinding roller, the longer the working length, and the faster the rotation speed, the higher the working efficiency of the roller crusher 2, and vice versa.

[0120] The discharge port 16 of the double-roll crusher corresponds vertically to the feed end of the conveyor belt 3; there is a reserved matching gap at the corresponding position, and the material falls vertically to the conveying starting end of the conveyor belt 3 under the action of gravity; the discharge end of the conveyor belt is vertically connected to the feed port of the collecting hopper 4 in the quantitative discharging mechanism, and there is a reserved matching gap at the connection, and the primary ground glass fiber material falls vertically into the inside of the collecting hopper 4 under the action of gravity. The discharge port of the collecting hopper 4 is connected to the feed port of the vibrating screening machine 5, and there is a matching gap at the connection, and the primary ground glass fiber material falls vertically into the feed port of the vibrating screening machine 5 under the action of gravity; the vibrating screening machine 5 has 4 discharge ports, and the first three discharge ports from top to bottom are provided with ground fiber packaging bags, and the last discharge port is connected to the external ground glass fiber material sedimentation tank through a plastic hose.

[0121] The vibrating screening machine 5 is obtained by improving the prior art.

[0122] The vibrating screening machine proposed in this embodiment has four layers of chambers from top to bottom, wherein the first to third layers of chambers are respectively provided with sieve plates, namely, a first layer of sieve plate 21 located in the first layer of chamber, a second layer of sieve plate 22 located in the second layer of chamber, and a third layer of sieve plate 23 located in the third layer of chamber.

[0123] In this embodiment, a spray mechanism is added above the first screen plate of the vibrating screening machine 5, and the spray mechanism provides water for it through a BE type water pipe rotary joint; the spray mechanism consists of a hollow rotating main shaft 20 and two left and right spray pipes. The structure of the spray pipe should be symmetrical on the left and right. The spray pipe 18 is connected to the rotating main shaft 20 through an embedded threaded pipe fitting. The spray mechanism is fixed with bearings as card points through two sets of external mechanical arms. There is a reserved matching gap between the spray pipe 18 of the spray mechanism and the first layer chamber of the vibrating screening machine, and there is no direct contact. The rotating main shaft 20 shaft body has a reserved pulley installation. A gap is installed to provide a power transmission point for an external speed-regulating motor, and the rotating main shaft drives the spray pipe to rotate by transmitting power through a pulley, thereby completing the rotational spraying operation of the spray pipe 18 on the primary ground glass fiber material on the screen plate; the primary ground glass fiber material enters the vibrating screening machine 5, and is separated under the dual effects of the flushing of the water flow of the spray mechanism and the electromagnetic vibration. The role of the spray is, first, that the water flow can prevent the material from agglomerating during screening, and secondly, that the material friction generates static adsorption to block the mesh of the screen plate, thereby allowing the material to pass through the screen plate smoothly to achieve a better screening effect.

[0124] In this embodiment, the outer diameter of the rotating spindle 20 is 80 mm to 120 mm; the rotating spindle passes through the screen through a circular hole reserved in the middle of the screen, and the diameter of the circular hole is slightly larger than the diameter of the rotating spindle, which is 81 mm to 122 mm.

[0125] The first sieve plate 21 of the vibrating screening machine 5 corresponds to the discharge port 7, the mesh size of the sieve plate is 140-160 meshes, and the length of the retained ground glass fiber material is >110 μm.

[0126] The second sieve plate 22 of the vibrating screening machine 5 corresponds to the discharge port 8, the mesh size of the sieve plate is 180-200 meshes, and the intercepted ground glass fiber material has a length specification of 80 μm ≤ ≤ 110 μm.

[0127] The third sieve plate 23 of the vibrating screening machine 5 corresponds to the discharge port 9, and the mesh size is 440-480 meshes, and the intercepted ground glass fiber material has a length specification of 30 μm ≤ < 80 μm.

[0128] The material discharging ports 7, 8, 9 are connected to material dispensing bags, the dispensing bags are made of nylon woven bags, and the dispensing bags are fixed to the discharging ports by annular clamps;

[0129] The fourth chamber of the vibrating screening machine 5 corresponds to the discharge port 10, and the mixture of the ground glass fiber material and the spray water separated from the first three layers of the sieve plates flows out from the discharge port, wherein the length of the ground glass fiber material is less than 30 μm. The mixed material at the discharge port is guided by a plastic hose into a ground glass fiber material sedimentation tank, and the sedimentation tank is used to separate the upper layer of clear water and the lower layer of sedimentation material; the separated sedimentation material is used as a resin reinforcement material with low requirements on product performance after drying, or as a glass fiber glass raw material to be re-melted and drawn into a glass fiber raw material, and the upper layer of clear water is used as circulating water for a circulating spraying device.

[0130] The collecting hopper 4 is located above the vibrating screening machine 5, and a primary ground glass fiber material quantitative discharging mechanism 12 is provided at the lower discharge port of the collecting hopper 4. The collecting hopper quantitative discharging mechanism 12 includes a polygonal pressing pipe and a speed regulating motor. By adjusting the rotation speed of the pressing pipe and the reserved gap between the pressing pipe and the stainless steel plate at the bottom of the discharge port 12 of the collecting hopper 4, the primary ground glass fiber material can be uniformly fed into the feed port of the vibrating screening machine 5.

[0131] The storage hopper 1 is used to store chopped glass fiber raw materials, and the chopped glass fiber raw materials are fed into the storage hopper 1 by manual or automatic feeding equipment.

[0132] The quantitative discharging mechanism 12 of the collecting hopper includes a polygonal pressing tube and a speed regulating motor. The pressing tube is cylindrical, and its cross section is a 6-10-sided columnar shape, and is made of aluminum or stainless steel. The two ends of the pressing tube are fixed on both sides of the discharge port of the collecting hopper 4 through bearings. The longitudinal direction of the pressing tube is parallel to the discharge port of the collecting hopper 4, and its length is equal to the width of the discharge port of the collecting hopper 4. There is a gap between it and the silo shell baffle of the discharge port of the collecting hopper 4. The gap should ensure that the primary ground glass fiber material does not overflow, and should also ensure that when the pressing tube rotates, the material can be uniformly brought out by the pressing tube from the gap between the inner wall baffle of the silo below the collecting hopper 4 and the pressing tube; one end of the pressing tube is connected to the speed regulating motor, and the connection between the pressing tube and the speed regulating motor is a gear or a pulley. The speed regulating motor can adjust the rotation speed of the polygonal pressing tube. The diameter of the circumscribed circle of the pressing tube is 60-120 mm, and the distance from the pressing tube to each A groove with a width of 5 to 15 mm, a depth of 5 to 10 mm and a length equal to the length of the pressing pipe is opened at 3 to 15 mm on both sides of the edge line. The length of the pressing pipe ranges from 120 to 350 mm. The length of the pressing pipe should match the feed port of the vibrating screening machine 5, and the length is equal to or less than the diameter of the feed port of the vibrating screening machine. The pressing pipe rotates at a uniform speed in the counterclockwise direction at a speed of 0 to 180 rpm. By adjusting the speed of the pressing pipe and adjusting the matching gap between the pressing pipe and the inner wall baffle of the silo wall below the collecting hopper 4, the primary ground glass fiber material can enter the feed port of the vibrating screening machine 5 at a uniform speed at a discharge speed of 1.8 to 120 kg / hour.

[0133] The present invention realizes the continuous grinding process of glass fiber raw material powder by adopting a double-roll crusher, and does not produce too many substandard and too short fiber particles, thereby enabling continuous production, simple and practical process, easy quality control, and high finished product yield.

Claims

1. A wet method for preparing ground glass fiber, characterized in that: The specific process is: Step 1, preparing chopped glass fiber raw materials: Cutting the glass fiber raw material into short glass fibers with a length of 70 mm; soaking the short glass fiber raw material with deionized water and dehydrating it; obtaining the short glass fiber raw material Step 2, raw material storage: The obtained chopped glass fiber raw material is sent into a storage hopper (1) for standby use; Step 3, grinding the raw materials: The chopped glass fiber raw material in the storage hopper (1) is sent out through the quantitative discharging mechanism (11), and the chopped glass fiber raw material baffle plate (24) enters the feed port (26) of the double-roll crusher. The chopped glass fiber raw material is squeezed and cut by the three-layer ceramic rollers and ground into primary ground glass fiber material. During the grinding of the raw materials, the pressure between the three groups of grinding rollers is adjusted according to the specifications of the raw materials and the finished product specifications; the diameter range of the glass fiber raw materials is 7 to 9 μm, the length of the finished ground fiber is 30 to 110 μm, and when the fiber diameter is thicker and the length specification of the ground fiber finished product is longer, the grinding roller speed should be increased and the pressure between the grinding rollers should be reduced; when the fiber diameter is finer and the length specification of the ground fiber finished product is shorter, the grinding roller speed should be reduced and the pressure between the grinding rollers should be increased; Step 4, screening: The chopped glass fiber raw material is crushed by a double-roll crusher (2) and discharged from a primary ground glass fiber discharge port (16), and is fed into a collecting hopper (4) through a conveyor belt (3) and a collecting hopper feed port (25), and is adjusted in feeding direction by a primary ground glass fiber material baffle plate (28) through a quantitative discharge mechanism (12) and then enters a vibrating screening machine (5) for screening; After being screened by the vibration screening machine, the primary ground glass fiber material is screened into four levels according to the different fiber lengths. The first-level ground glass fiber material is separated from the first-layer discharge port (7), and its material length is greater than 110 μm; the second-level ground glass fiber material is separated from the second-layer discharge port (7), and its: 80 μm ≤ material length ≤ 110 μm; the third-level ground glass fiber material is separated from the third-layer discharge port (9), and its: 30 μm ≤ material length < 80 μm; the ground glass fiber and the spray water separated by the first three-level sieve plates are gathered into the fourth-layer cavity of the vibration screening machine, and the fourth-level cavity is below the third-level sieve plate (23), and is separated from the fourth-layer discharge port (10), and its material length is less than 30 μm; Ground glass fiber particles are obtained.

2. The wet method for preparing ground glass fiber according to claim 1, characterized in that: When grinding the raw material: when the diameter of the grinding roller is 85 mm, the working length of the grinding roller is 125 mm, and the rotation speed of the grinding roller is 32 rpm, the working efficiency of the roller crusher (2) is 1.8 kg / hour; When the diameter of the grinding roller is 150 mm, the working length of the grinding roller is 300 mm, and the speed of the grinding roller is 66 rpm, the working efficiency of the roller crusher is 20 kg / hour; When the diameter of the grinding roller is 400 mm, the working length of the grinding roller is 810 mm, and the rotation speed of the grinding roller is 135 rpm, the working efficiency of the double-roll crusher is 120 kg / hour.

3. The wet method for preparing ground glass fiber according to claim 1, characterized in that: When grinding the raw materials: when the diameter of the glass fiber is 7um, the finished glass fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~200 rpm, the pressure between the grinding rollers is 7~12Mpa, and the yield rate is>75%; When the diameter of the glass fiber is 7um, the finished product of the ground fiber is: 55μm≤length range≤110μm, the grinding roller speed range should be <350 rpm, the pressure between the grinding rollers is 4-6Mpa, and the yield rate is >75%; When the fiber diameter is 9um and the finished product of the ground fiber is 30μm≤length range<55μm, the grinding roller speed range is 50~180 rpm, the pressure between the grinding rollers is 8~14Mpa, and the yield rate is>75%; When the fiber diameter is 9um and the finished ground fiber is 55μm≤length range≤110μm, the grinding roller speed range is 180~400 rpm, the pressure between the grinding rollers is 5~7Mpa, and the yield is >75%.

4. The wet method for preparing ground glass fiber according to claim 1, characterized in that: In step 4, if the first-stage ground glass fiber material after being screened by the vibrating screener (5) does not meet the average length requirement of the ground glass fiber, it is collected and removed with a spin dryer to remove excess water, and then sent to the storage hopper (1) to enter the grinding stage for grinding again; The second-stage ground glass fiber material and the third-stage ground glass fiber material screened by the vibrating screening machine (5) are respectively subjected to spin drying, dehydration, drying and packaging for standby use; If the fourth-stage ground glass fiber material screened by the vibration screening machine (5) does not meet the average length requirement of the ground glass fiber, the mixture of the material and the spray water flows out through the fourth-stage discharge port and is merged into a sedimentation tank. After the material is precipitated, the upper layer of clear water and the lower layer of precipitated material are separated to obtain precipitated material; after drying, the precipitated material is used as a resin reinforcement material with low requirements on product performance, or is used as a glass fiber raw material to be re-melted and drawn into a glass fiber raw material for use.

5. A roller crushing device for preparing milled glass fiber by wet method according to claim 1, characterized in that: The roller grinding device comprises a roller grinding machine (2), a vibrating screening machine (5), a quantitative discharging mechanism (12), a spray mechanism and a conveyor belt (3); wherein a storage hopper (1) is provided above the feed port of the roller grinding machine; the discharge port (16) of the roller grinding machine corresponds to the feed end of the conveyor belt; the discharge end of the conveyor belt corresponds to the feed port of the quantitative discharging mechanism; the discharge port of the quantitative discharging mechanism corresponds to the feed port (27) of the vibrating screening machine; the rotating main shaft (20) in the spray mechanism is located on the upper part of the first layer of the sieve plate of the vibrating screening machine, the spray mechanism is fixed by an external mechanical arm with a bearing as a clamping point, and is fixed to the upper part of the vibrating screening machine with a matching gap between the spray mechanism and the vibrating screening machine, and is not in direct contact; a water pipe rotating joint (17) is installed at the top end of the rotating main shaft, and the water pipe rotating joint is connected to an external water source; each layer of the sieve plate is connected to a discharge port, and each discharge port is located outside the housing of the vibrating screening machine; The feed port of the double-roll crusher (2) is vertically connected to the discharge port of the chopped fiber storage hopper (1), and a matching gap is reserved above and below the connection, and the spacing between the matching gaps is 200-400 mm; a baffle plate (24) for adjusting the direction of material movement is provided between the matching gaps, and the baffle plate is used to prevent material from overflowing and adjust the angle of the material entering the feed port (26) of the double-roll crusher; The discharging port of the storage hopper (1) is provided with a quantitative discharging mechanism (11), and the rotating speed of the quantitative discharging mechanism is adjusted to achieve uniform feeding of the chopped glass fiber raw material to the roller crusher (2); The vibrating screening machine has four layers of chambers from top to bottom, wherein the first layer chamber to the third layer chamber are respectively provided with sieve plates, namely a first layer sieve plate (21) located in the first layer chamber, a second layer sieve plate (22) located in the second layer chamber, and a third layer sieve plate (23) located in the third layer chamber; The first sieve plate (21) of the vibrating screening machine (5) corresponds to the discharge port (7), the mesh size of the sieve plate is 140-160 meshes, and the length of the retained ground glass fiber material is greater than 110 μm; The second sieve plate (22) of the vibrating screening machine (5) corresponds to the discharge port (7), the mesh size of the sieve plate is 180-200 meshes, and the intercepted ground glass fiber material has a length size of 80 μm ≤ ≤ 110 μm; The third sieve plate (23) of the vibrating screening machine (5) corresponds to the discharge port (9), and has a mesh size of 440-480 meshes, and the intercepted ground glass fiber material has a length specification of 30 μm ≤ < 80 μm; Each discharge port is connected to a material packing bag; each packing bag is fixed to each discharge port by a ring clamp; The fourth chamber of the vibrating screening machine (5) corresponds to the discharge port (10), and a mixture of ground glass fiber material and spray water separated from the first three layers of sieve plates flows out from the discharge port, wherein the length of the ground glass fiber material is less than 30 μm. The mixed material at the discharge port is guided by a plastic hose into a ground glass fiber material sedimentation tank, and the sedimentation tank is used to separate the upper layer of clear water and the lower layer of sedimentation material.

6. The double-roll crushing device for wet-process preparation of milled glass fibers according to claim 5, characterized in that: The spray mechanism comprises a rotating main shaft (20), a pair of spray pipe assemblies and a rotating joint (17); the rotating joint is installed at the top end of the rotating main shaft to provide the rotating main shaft with deionized circulating water at a pressure of 0.15 to 0.5 MPa; the rotating main shaft is a hollow tube, the inner hole of which forms a passage for spraying water in the spray mechanism; one end of two spray pipes in the spray pipe assembly is symmetrically installed on the outer circumferential surface of the rotating main shaft; a nozzle is installed at the end of each spray pipe, and the length of the spray pipe is 1 / 2 of the radius of the screen.

7. The double-roll crushing device for wet-process preparation of milled glass fibers according to claim 5, characterized in that: The roller crusher (2) comprises three groups of grinding rollers, which are respectively a first group of grinding rollers (13), a second group of grinding rollers (14) and a third group of grinding rollers (15) from top to bottom, and the first group of grinding rollers are coarse grinding rollers, and the second group of grinding rollers and the third group of grinding rollers are both fine grinding rollers; the three groups of grinding rollers each comprise two rollers, and the circumferential surface of one grinding roller is a smooth surface, and the circumferential surface of the other grinding roller is a tooth surface, and the tooth surface forms the cutting teeth of the grinding roller; the tooth pitches of the cutting teeth of the three groups of grinding rollers from top to bottom are respectively: 1 mm, 0.5 mm and 0.15 mm; the center distance between two adjacent groups of grinding rollers is 15 to 50 mm; The diameter of each grinding roller is 85 to 500 mm, the working length is 100 to 1000 mm, and the rotation speed is 28 to 350 rpm; the surface material of the grinding roller of the roller crusher (2) is a high-hardness ceramic arc pressure plate, and the inner core is an alloy steel inner core; the surface of the grinding roller of the roller crusher is a ceramic arc pressure plate and the inner core is an alloy steel inner core, the diameter of the pressure roller is the diameter of the ceramic arc pressure plate and the alloy steel inner core after the combination, the combined diameter is 85 to 500 mm, the arc surface thickness of the ceramic arc pressure plate is 30 to 105 mm, and the diameter of the steel inner core is 55 to 395 mm.

8. The double-roll crushing device for wet-process preparation of milled glass fibers according to claim 5, characterized in that: Two chopped glass fiber raw material baffles (24) are arranged on both sides of the feed inlet of the double-roll crusher (2), with a length equal to that of the roller of the double-roll grinder and a width of 100 to 350 mm. By adjusting the angle of the baffles on one side or both sides, the chopped glass fiber raw material can smoothly enter the feed inlet of the double-roll crusher.

9. The double-roll crushing device for wet-process preparation of milled glass fibers according to claim 5, characterized in that: The quantitative discharging mechanism (11) comprises a polygonal pressing tube and a speed regulating motor; the cross section of the pressing tube is a 5-12-sided polygon; the two ends of the pressing tube are fixed to the two sides of the discharging port of the storage hopper (1) through bearings; one end of the pressing tube is connected to the speed regulating motor; the diameter of the circumscribed circle of the pressing tube is 60-150 mm; a groove with a width of 10-30 mm, a depth of 5-30 mm, and a length equal to that of the pressing tube is opened 1.5-20 mm from both sides of each angular line of the pressing tube; by adjusting the rotation speed of the pressing tube and the matching clearance between the pressing tube and the outer shell baffle below the storage hopper bin, the chopped yarn material is uniformly pushed out of the storage hopper in a manner of 0.5-5 mm in thickness, 100-1000 mm in width, and a travel speed of 180-370 mm per minute.

10. The double-roll crushing device for wet-process preparation of milled glass fibers according to claim 5, characterized in that: The quantitative discharge mechanism (12) of the collecting hopper comprises a polygonal pressing tube and a speed regulating motor; the cross section of the pressing tube is a 6-10-sided polygon; the two ends of the pressing tube are fixed on both sides of the collecting hopper discharge port through bearings, and there is a gap between the pressing tube and the silo shell baffle of the collecting hopper discharge port; one end of the pressing tube is connected to the speed regulating motor, the diameter of the circumscribed circle of the pressing tube is 60-120 mm, and a groove with a width of 5-15 mm, a depth of 5-10 mm, and a length equal to that of the pressing tube is opened 3-15 mm from both sides of each angular line of the pressing tube. By adjusting the rotation speed of the pressing tube and adjusting the matching gap between the pressing tube and the inner wall baffle of the silo wall below the collecting hopper, the primary ground glass fiber material can enter the feed port of the vibrating screening machine (5) at a uniform speed at a discharge speed of 1.8-120 kg / hour.

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