ADJUSTABLE CONICAL ROTOR / STATOR GRINDER AND CYCLONE RECIRCULATION CLOSED-CIRCUIT POLYMER POWDER PRODUCTION SYSTEM
Patent Information
- Application Number
- TR202613860
- Authority / Receiving Office
- TR · TR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-08-15
- Publication Date
- 2026-08-21
Smart Images
Figure 00000016_0000 
Figure 00000017_0000
Abstract
Description
1 TARIFF ADJUSTABLE CONICAL ROTOR-STATOR GRINDER AND CYCLONE RETURN CIRCULATING CLOSED-CIRCUIT POLYMER POWDER PRODUCTION SYSTEM TECHNICAL AREA 5 The invention involves mechanically grinding polymer materials into powder. The invention relates to the field of grinding systems for the production of polymers. Specifically, the invention applies to polymers. The granules are adjustable, formed between a fixed gear and a rotating bevel gear. where the particles are broken down within the grinding range; the ground particles are pneumatically fed into a cyclone. where the coarse fraction separated in the cyclone is conveyed back to the grinding area and fine 10 closed-loop polymer powder production where the fraction is collected via a filter. It relates to the field of systems. STATE OF THE ART Rotor-stator type grinders are used in the powdering of polymer materials, 15 Disc grinders and similar mechanical shredding systems are used. These types of Changing the gap between grinding elements in the systems allows for different grain sizes. It is a well-known practice in terms of obtaining its dimensions. Publication number EP 1853636 B1, included in the known state of the art. The document describes 20 models containing a rotor and a stator positioned concentrically with it. The rotor-stator structure is explained. In this structure, the rotor is mounted on a conical surface. It has the ability to axially displace the rotor and stator relative to each other. the gap between them can be changed by arranging them in such a way It is stated that the document mainly concerns salt-free polymer dispersions. It is intended for rotor-stator arrangements that can be used in coagulation. 25 WO 00 / 71256 A1 publication number, which is included in the known state of the art. The document describes a colloid mill. In this mill, a rotor is used. It is rotated directly via a motor-driven shaft, and between the rotor and stator The gap is filled by displacing the motor-driven shaft in the axial direction. It is adjustable. The document also states that this axial movement has an adjustment point of 30. This is accomplished through the mechanism and by measuring the rotor-stator gap. There is a regulation in place regarding this. 2 In addition, a colloid is mentioned in document number DE 3221476 A1. The grinding range in the mill is monitored via a sensor and the stator is controlled by a servo. The document describes how to relocate using the grinding mechanism. a regulation to keep the range under control during operation It is related. 5 However, the technical aspects described in the documents mentioned above... in the arrangements, polymer granules are mounted on an adjustable fixed gear–rotary bevel gear. a gas-solid mixture formed after decomposition in the grinding zone The coarse fraction is transported to the cyclone via a suction-pressure fan, and separated in the cyclone. the mixture is returned to the grinder chamber and the fine fraction is cyclone-fluidized 10 a closed-loop product circulation architecture where communication is kept in a filter. It is not presented. The aforementioned documents also state that the raw material product input is via the cyclone. It is connected to the upper region, the raw material taken into the system is connected to the lower part of the cyclone. It moves from the cyclone return in this section to the grinder chamber and the grinding process begins at 15. subsequently, the large fraction that moved to the lower part of the cyclone returned to the same cyclone. an integrated arrangement from which it is passed to the re-grinding zone It is not explained. Therefore, in the known state of the technology, the rotor–stator grinding gap Although various mechanical solutions exist for its adjustment, the above 20 The documents specify that the grinding unit uses pneumatic conveying and cyclone fractionation. Separation, coarse fraction recirculation, and fine product filtration all in the same product circulation line. A polymer powder production system in which it is integrated is not presented. TECHNICAL PROBLEM TO BE SOLVED 25 For mechanical grinding of polymer granules, especially PA6 and PA12 In polymers exhibiting ductile properties, such as those mentioned, the heating that occurs during grinding, Deformation, adhesion, and deposition on equipment surfaces, target grain size This makes it difficult to achieve a consistent result. In addition, the grinding gap between the rotor and stator is only 30 adjustment, the different particle sizes formed after grinding controlled separation and reuse of the large fraction that does not reach the target size. It is not sufficient for grinding. 3 In open-circuit grinding systems, particles larger than the target size It can remain in the resulting product; the entire ground product can be recycled. When fed into the grinder, the fine particles will also have reached the target size. It is passed through the re-grinding zone, and consequently, unnecessary energy is lost. Excessive grinding can occur with consumption. 5 The technical problem that is intended to be solved within this scope is the polymer granules. Mechanical grinding involves the crushing of the material in a controlled grinding zone with a mechanical grinding opening. pneumatic removal of particles from the grinding chamber, resulting particles the separation of the coarse fraction from the mixture and only the separated coarse fraction being used An integrated closed-loop grinding system that ensures the material is returned to the grinding zone. 10 It is the creation of its architecture. Another technical problem that needs to be solved is the relationship between the grinding gap and the cyclone. a system that allows the separation conditions to be adjusted independently Within the system architecture, the recirculation of particles that reach the target product fineness. 15 separated from the line and retained in the filter, failing to reach the target product fineness. This means that the particles can pass through the grinding zone more than once. A BRIEF DESCRIPTION OF THE INVENTION The invention involves mechanically grinding polymer granules into powder. 20 designed for adjustable grinding range and closed-loop pneumatic product circulation. It is a grinding system. The grinding units within the scope of the invention are positioned opposite each other. It includes a fixed gear and a bevel gear that is rotated by a motor. Rotating bevel by changing the axial position of the gear via a mechanical adjustment element, The radial grinding clearance located between the fixed gear and the rotary bevel gear is 25. It can be changed. The polymer granules fed into the system are milled in the aforementioned grinding zone. It breaks down and the resulting particles are created by a suction-pressure fan. The gas is removed from the grinding chamber by the gas flow and returned to the cyclone via the return line. It is being moved. 30 In the gas-solid separation carried out in the cyclone, the coarse fraction is located at the bottom of the cyclone. It is directed to the section and returned to the grinding chamber via the cyclone return. 4 is conveyed. The fine fraction, on the other hand, is involved in fluid communication with the cyclone along with the carrier gas. It is directed to the filter and held there. Grinding chamber, return line, suction-discharge fan, cyclone and cyclone return The return cycle together forms a closed pneumatic product circulation loop. This During circulation, the large fraction separated in the cyclone is conveyed back to the grinding area. 5 The fine fraction product is separated from the circulation. The invention also includes modifying the separation behavior of the cyclone. There is a cyclone adjustment mechanism for this purpose. Thus, it is related to the grinding opening. The separation condition within the cyclone is adjusted through mechanical adjustment within the system. It can be implemented separately. The system uses polyamide 6 and / or polyamide 12 10 It is used in grinding granules. Polymer granules are ground before grinding. and / or by using low-temperature gas or cryogenic fluid during grinding It can be cooled. Cryogenic fluid or refrigerated gas is introduced into the product inlet via a cyclone. It can be fed into the return line, the grinding chamber, or a combination of these. DESCRIPTION OF THE FIGURES Figure 1 shows the adjustable conical rotor-stator grinder with cyclone recirculation, which is the subject of the invention. General schematic view of a closed-loop polymer powder production system. This shows that in this way, the raw material taken into the system from the product input is ground. 20 relating to the unit, return line, cyclone, cyclone return and bag filter The general layout is shown. Figure 2 shows a detailed view of the grinding unit indicated by A in Figure 1. This detail view shows the fixed gear (3), rotary bevel gear (4), grinder The placement of the reservoir (5) and the diameter adjustment bolt (6) is shown. The explanations for the reference numbers shown in the figures are as follows: 25 1. Engine 2. Product Introduction 3. Fixed gear 4. Rotary bevel gear 5. Grinding chamber 30 6. Diameter adjustment bolt 7. Return line 8. Suction-discharge fan Cyclone 9 10. Cyclone adjustment lever 11. Cyclone return 12. Bag filter 5 DETAILED DESCRIPTION OF THE INVENTION The invention involves mechanically grinding polymer granules into powder. pneumatic with an adjustable grinding opening grinding unit for bringing about the desired result. 10 conveying, cyclone separation, coarse fraction recirculation and fine fraction filtration a closed-loop polymer powder production system integrated within the same system It is related. A general schematic view of the invention is shown in Figure 1, indicated by A in Figure 1. A detailed view of the grinding unit is shown in Figure 2. In Figure 1 The system shown basically consists of a motor (1), product inlet (2), fixed gear (3), rotary cone 15 gear (4), grinder chamber (5), diameter adjustment bolt (6), return line (7), suction– pressure fan (8), cyclone (9), cyclone adjustment lever (10), cyclone return (11) and bag filter (12) includes. Grinding Unit and Adjustable Grinding Range The grinding unit is located in the grinding chamber (5) and 20 opposite each other. It includes a fixed gear (3) and a rotary bevel gear (4). Fixed gear (3), The grinding chamber (5) is held in a fixed position, and the rotating conical gear (4) is It is driven by the motor (1) to generate rotational motion. The grinding surface of the fixed gear (3) and the reciprocal grinding of the rotating bevel gear (4) There is a grinding zone between the surfaces through which polymer granules pass. 25 The opposite surfaces of the fixed gear (3) and the rotary bevel gear (4) cut into the material, A tooth, protrusion, or tooth can apply at least two of the following effects: compression, friction, and impact. These may include channels or equivalent surface structures. As shown in more detail in Figure 2, the rotating bevel gear (4) Due to the conical geometry of the grinding surface, the axis of rotation of the rotary bevel gear (4) is 30° Changing the axial position in the direction of the fixed gear (3) and the rotary bevel gear This causes a change in the radial grinding gap between (4). 6 The axial position of the rotating bevel gear (4) is adjusted by the diameter adjustment bolt (6) It is adjusted mechanically by means of the movement of the diameter adjustment bolt (6). axis of the rotating bevel gear (4) or bearing arrangement carrying the rotating bevel gear (4) positioned accordingly and mechanically at the selected location It is fixed. Thus, the grinding between the fixed gear (3) and the rotating bevel gear (4) is 5 The opening can be changed without disassembling the grinding unit. Diameter adjustment bolt (6), a mechanical adjustment that can be turned manually in an application. It is in the form of an element. In alternative applications, the same axial positioning screw is used. spindle, handwheel, geared drive, linear actuator or equivalent positioning This can be achieved using this mechanism. 10 The gap between the fixed gear (3) and the rotary bevel gear (4) is the polymer to be processed. It can be adjusted depending on the properties of the raw material and the desired product fineness. Axial position due to the conical geometry of the rotary bevel gear (4) The change alters the radial distance between the opposing grinding surfaces, and Thus, the same grinding unit can be operated at different grinding openings. 15 Product Input and Conveying Raw Materials to the Grinding Unit The polymer raw material is taken into the system via product entry (2). Product input (2) is carried out in the application shown in Figure 1, the cyclone (9) It is connected to the upper region. Product input (2), checking the system's connection with the external environment when necessary 20 It can be configured with valves or shut-off elements. The product Polymer granules taken into the system from the inlet (2) pass through the cyclone (9) to the bottom of the cyclone moving toward the section and via cyclone return (11) the grinder It reaches its reservoir (5). In this way, between the product inlet (2) and the grinder chamber (5), the bottom 25 of the cyclone (9) a raw material feed section and cyclone return (11) The route is being created. The same cyclone return (11), the operation of the system. during which the coarse fraction separated in the cyclone (9) is returned to the grinder chamber (5) It is also used in transmission. The granules that reach the grinding chamber (5) are driven by the motor (1) with a fixed gear (3) 30 It enters the grinding zone between the rotating bevel gear (4) and reciprocating It is mechanically broken down between the grinding surfaces. 7 Closed-Loop Pneumatic Product Circulation The particles formed after grinding are removed from the grinder chamber (5) removal and transfer to the cyclone (9) by suction-pressure fan (8) This is achieved through the generated gas flow. The suction fan (8) is located on the outlet side of the grinder chamber (5) It is positioned within the system in such a way as to form the grinding area. The particles that come out are removed from the grinder chamber (5) by this gas flow and the gas- The solid mixture is conveyed to the cyclone (9) via the return line (7). Return line (7), suction-discharge fan (8), cyclone (9), cyclone return (11) and the grinding chamber (5) together form a closed product circulation loop. 10 In the cycle in question, the material being ground is sucked from the grinding chamber (5) – Taken by means of the pressure fan (8) and through the return line (7) to the cyclone (9) The large fraction separated in the cyclone (9) is transported via the cyclone return (11). It is sent back to the grinder chamber (5). Thus, particle grinding depending on the separation behavior in the cyclone (9) 15 It can pass through the region one or more times. The lower part of the cyclone (9) The entire product is fed back into the system for regrinding of the directed fraction. not required, through the fraction directed to the bottom outlet in the recirculation cyclone (9) is being carried out. The large fraction separated in the cyclone (9) is affected by gravity and / or the 20 formed within the system. from the cyclone return (11) to the grinder chamber (5) due to the effect of the pressure difference It can progress. The suction-discharge fan (8) creates on the outlet side of the grinder chamber (5). suction causes the ground particles to accumulate inside the grinding chamber (5). It limits the size of the grinder chamber to 25, depending on the application conditions. (5) It is possible to operate at atmospheric pressure or low positive pressure. It can be arranged in such a way as to provide. Cyclone Tuning System The gas-solid mixture coming from the return line (7) enters the cyclone (9). Cyclone (9) will impart rotational motion to the gas-solid mixture that reaches it. It has been arranged. 8 Larger and / or denser particles present in the gas-solid mixture cause the cyclone to break free. (9) heading towards the surrounding area and the cyclone wall, the lower part of the cyclone It is advancing. The fraction in question, which reached the lower part of the cyclone (9), is moving back from the cyclone. It is conveyed back to the grinder chamber (5) via the return (11). The fine particle-rich gas stream exits the central region of the cyclone (9) 5 progressing in line with and in fluid communication with the cyclone (9) bag filter (12) is directed towards. In this way, the particles formed after grinding are in the same circulation line in a single flow path. not showing behavior; cyclone return according to separation behavior in the cyclone (9) It is directed to the return (11) or bag filter (12). 10 Fraction Separation in a Cyclone The system is designed to modify the separation behavior of the cyclone (9) by adjusting the cyclone. It includes the arm (10). The cyclone adjustment lever (10) adjusts the position of a flow adjustment element associated with the cyclone (9). It is arranged in such a way as to change the position of the cyclone adjustment lever (10) to 15 By changing the flow and separation conditions inside the cyclone (9) during operation or can be adapted across different businesses. Thus, two separate mechanical adjustments can be made within the system. The first of these is the rotary bevel gear (4) with fixed gear (3) via the diameter adjustment bolt (6) adjustment of the grinding gap between them; secondly, the cyclone adjustment lever (10) 20 It is by modifying the separation behavior of the cyclone (9). Collection of Fine Product Fine particle-rich gas stream leaving the central region of the cyclone (9) It reaches the bag filter (12). Bag filter (12) allows fine particles to be retained on the permeable filter surface and 25 It is designed to allow the carrier gas to pass through the filter surface. Thus, the fine fraction that does not go to the lower part of the cyclone (9) recirculates. It is separated from the cycle and retained in the bag filter (12). In one application, a bag filter (12) collected fine polymer dust as a product. It forms the gas-solid separation element. Here, a closed product circulation cycle, 30 The large fraction separated in the cyclone (9) is re-released via the cyclone return (11). 9 This refers to the recirculation of the product, which is conveyed to the grinder chamber (5). The carrier gas the entire product is recirculated within the system, creating a closed product circulation loop. It is not a necessary element. The fine particle-rich gas stream is the center of the cyclone (9). from the region to the bag filter (12), fine particles are in the bag filter (12) While being held, the carrier gas can pass through the filter surface. 5 Low Temperature and Cryogenic Processing The system covered by the invention is particularly suitable for ambient temperature applications such as PA6 and PA12. Low temperature or cryogenic grinding of polymers that exhibit ductile behavior. It can be operated under these conditions. In one application, PA6, PA12 or another thermoplastic raw material is added to the system 10 to a temperature that will facilitate its brittleness before it is added It is cooled. The raw material, for example, is a gas cooled to minus 50 °C. It can be pre-cooled using [method name]. The system uses cryogenic fluid and / or gas cooled to minus 50 °C. to the product inlet (2), cyclone return (11), grinder chamber (5) or 15 of these It may include at least one cooling connection for transmission to more than one device. The cooling connection in question is for the transport of cryogenic fluid and / or refrigerated gas. to provide fluid communication to at least one of the specified system components It can be edited. In another application, liquid nitrogen is added to the product inlet (2), cyclone return (11), 20 It can be fed into the grinder chamber (5) or more of them. Low The gas at that temperature also constitutes at least a portion of the carrier gas within the system. It can create. Mechanical circulation architecture of the system in cryogenic or low-temperature operation. It does not change. Cooled polymer granules enter the system from the product inlet (2) 25 It is taken and reaches the grinder chamber (5) via the cyclone return (11), constant The particles are broken down between the gear (3) and the rotating bevel gear (4), and the resulting particles are sucked up. It is conveyed to the cyclone (9) by the pressure fan (8), and directed to the lower part of the cyclone (9). The fraction is ground again and the fine fraction is retained in the bag filter (12). System Operation 30 Before the system is started, the fixed gear (3) and the rotary bevel gear (4) The grinding gap between them is adjusted by means of the diameter adjustment bolt (6). Diameter The movement of the adjustment bolt (6) adjusts the axial position of the rotary bevel gear (4). changing and mutually grinding surfaces due to conical surface geometry The radial clearance between them is determined. After determining the grinding opening, the motor (1) and the suction-discharge fan (8) is operated. Preferably pre-cooled polymer granules product 5 from the inlet (2) to the system, from the lower section of the cyclone (9) and the return of the cyclone It passes through its return (11) and reaches the grinder chamber (5). The granules in the grinding chamber (5) are fed by the fixed gear (3) and the motor (1) from the grinding zone between the rotating bevel gear (4) rotated by It breaks apart as it passes through. 10 The resulting particles are passed through the grinder by the gas flow created by the suction-discharge fan (8). It is removed from the reservoir (5) and through the return line (7) to the cyclone (9) It is being moved. The large fraction heading towards the bottom exit in the cyclone (9) via the cyclone return (11) It re-enters the grinding chamber (5) and again the fixed gear (3) and the rotating bevel gear 15 It is passed through the grinding zone between (4). Fine particle-rich gas stream then proceeds to the bag filter (12) and fine particles are on the bag filter (12) is being held. Diameter adjustment bolt (6) during operation or between different operations The grinding opening is adjusted using the cyclone adjustment lever (10), and the separation of the cyclone (9) is adjusted using the cyclone adjustment lever (10). The condition can be changed. Application Example In one application, PA12 granules are used as a raw material. PA12 The granules are brought to a low temperature before grinding and from the product inlet (2) 25 It is fed into the system. Granules reach the grinder chamber (5) via the cyclone return (11). between the fixed gear (3) and the rotary bevel gear (4) with a predetermined clearance It is broken down in the grinding zone. The particles formed after grinding are returned by means of the suction-pressure fan (8) 30 It is carried from the return line (7) to the cyclone (9). It is divided into the sub-section of the cyclone (9). 11 fraction return to the grinder chamber (5) via cyclone return (11) The stream of fine particle-rich gas is sent through and directed to the bag filter (12). This application involves mechanically processing PA12 granules under low temperature. It has been observed that it can be broken down to micron sizes. In the resulting PA12 powder... the characteristic melting behavior at approximately 186 °C is preserved and significant 5 It has been determined that thermal decomposition begins at approximately 390–400 °C. SEM images show significant agglomeration and melting at low magnifications. or no fusion was observed and in selected regions in the range of approximately 8–20 µm. Local particle sizes have been measured. These measurements were taken in selected regions. These were local measurements and the particle size distribution of the entire sample was 10 It is taken into consideration that it does not represent anything. Selective laser sintering test specimens were prepared using the obtained PA12 powder. The samples were prepared and the expected ductility of PA12 material was observed in the samples in question. The behavior was observed to be preserved. Alternative Applications The invention is not limited to grinding PA6 and PA12 granules. The system has low thermoplastic elastomer that can be embrittled under high temperature or cryogenic conditions, also used in grinding composite or recycled polymer materials It is available. 20 In an alternative application, an equivalent centrifugal separator instead of a cyclone (9) It can be used. In another alternative application, a cartridge can be used instead of a bag filter (12). A filter or equivalent gas-solid separation element can be used. Depending on capacity requirements, multiple grinding units and / or more than one Multiple cyclones can be arranged in parallel within the same system. 25
Claims
12 REQUESTS 1. A closed-loop grinding system for producing powder from polymer granules. and consists of a motor (1), a product inlet (2), a grinding chamber (5), A fixed gear is positioned opposite each other inside the grinding chamber (5) 5 (3) and a rotary bevel gear (4) driven by the motor (1), a diameter adjustment bolt (6), a return line (7), a suction-discharge fan (8), a cyclone (9), a cyclone adjustment lever (10), a cyclone return (11) and cyclone fluid (9) Closed-loop grinding system containing a bag filter (12) in communication and its feature is; 10 - diameter adjustment bolt (6), rotary bevel gear (4) or rotary bevel gear (4) the axial position of the bearing arrangement mechanically changing and fixing it in the selected position, due to the conical surface of the rotary bevel gear (4) the axial 15 position change between fixed gear (3) and rotary bevel gear (4) changing the radial grinding opening, - polymer of the opposite surfaces of the fixed gear (3) and the rotating bevel gear (4) granules are subjected to the least possible effects of cutting, compression, friction and impact. the inclusion of tooth, ridge and / or root canal structures that apply both, - The product inlet (2) is connected to the upper region of the cyclone (9), 20 - polymer granules taken from the product inlet (2) in the lower section of the cyclone (9) through the cyclone return (11) to the grinder chamber (5) transmission, - suction-discharge fan (8) on the outlet side of the grinder chamber (5) positioning and the gas-solid mixture coming out of the grinder chamber (5) 25 transport to the cyclone (9) via the return line (7), - return line (7), suction-discharge fan (8), cyclone (9), cyclone return (11) and the grinder chamber (5) have a closed product circulation loop to create, - Cyclone return (11) of the large fraction heading towards the lower part of the cyclone (9) 30 conveyed back to the grinder chamber (5), - fine particle-rich gas emanating from the central region of the cyclone (9) directing the current to the bag filter (12) and the cyclone adjustment lever (10), 13 to change the position of a flow adjustment element associated with the cyclone (9) It is regulated.
2. It is a closed-loop grinding system according to claim 1, and its **feature is;** product inlet (2), to the cyclone return (11), grinder chamber (5) or one of them excess cryogenic fluid and / or gas cooled to minus 50 °C 5 It must include at least one cooling connector.
3. According to claim 2, it is a closed-loop grinding system, **featured as;** polymer. The granules must be PA6 and / or PA12 granules.
4. Closed-loop grinding system according to claim 3, **feature:** cooling. The cryogenic fluid supplied via the connection is liquid nitrogen. 10 5. Closed-loop grinding system according to claim 2 or 3, with **feature:** cooling. closed connection of gas cooled to minus 50 °C The product must constitute at least a portion of the carrier gas in the circulation cycle.
6. It is a closed-loop grinding system according to claim 1, and its feature is that the cyclone (9) bottom the gravity of the large fraction moving towards the section and / or the 15 within the system through the cyclone return (11) to the grinder chamber due to the effect of the pressure difference (5) is transmission.
7. It is a closed-loop grinding system according to Claim 1, and its characteristic feature is that the diameter adjustment bolt (6) radial grinding gap between fixed gear (3) and rotary bevel gear (4) the first mechanical adjustment mechanism that changes the cyclone adjustment lever (10) with the cyclone 20 (9) Second mechanical adjustment that changes the position of the associated flow adjustment element. to establish the system and the first and second mechanical adjustments in question Their systems are separate from each other.
8. A closed-loop milling method for producing powder from polymer granules. and its characteristic is; 25 - radial grinding gap between fixed gear (3) and rotary bevel gear (4), bearing of the rotary bevel gear (4) or bearing of the rotary bevel gear (4) The axial position of the arrangement is mechanically adjusted by means of the diameter adjustment bolt (6). by changing it and fixing it in the selected position adjustment, 30 - Starting the motor (1) and the suction-discharge fan (8), 14 - from the product inlet connected to the upper region of the cyclone (9) of the polymer granules (2) to be given to the system, - the lower section of the cyclone (9) and the return of the cyclone of the polymer granules in question conveying the polymer through the return (11) to the grinder chamber (5). The granules are ground in the grinding chamber (5) by the motor (1) with a fixed gear (3) 5 from the grinding zone between the rotating bevel gear (4) by passing through at least two of the effects of cutting, compression, friction and impact. disintegration underneath, - The resulting gas-solid mixture is conveyed to the grinder by means of the suction-discharge fan (8). 10 removed from the reservoir (5) and through the return line (7) transport to the cyclone (9), - return line (7), suction-discharge fan (8), cyclone (9), cyclone return a closed product circulation loop between (11) and the grinder chamber (5) creation, - Cyclone return (11) of the large fraction heading towards the lower part of the cyclone (9) 15 conveyed back to the grinding chamber (5) via the fixed gear (3) Re-passing through the grinding zone between the rotating bevel gear (4), - fine particle-rich gas emanating from the central region of the cyclone (9) directing the stream to the bag filter (12) and the fine particles to the bag 20 of the flow adjustment element associated with the cyclone (9) by being held in the filter (12). the steps of changing its position via the cyclone adjustment lever (10) It includes.
9. According to claim 8, it is a closed-loop grinding method, characterized by its polymer properties. cryogenic fluid before and / or during grinding of granules and / or cooling by using gas cooled to minus 50 °C. 25 10. According to claim 9, it is a closed-loop grinding method, characterized by its polymer properties. The granules must be PA6 and / or PA12 granules.
11. According to claim 10, it is a closed-loop grinding method, characterized by its use of cryogenic fluid. as liquid nitrogen to the product inlet (2), cyclone return (11), grinder It is given to the reservoir (5) or to more than one of them. 30 12. Closed-loop grinding method according to claim 9 or 10, characterized by a temperature of -50°C. Carrier of gas cooled to °C in a closed product circulation loop It must constitute at least a portion of the gas.
13. It is a closed-loop grinding method according to claim 8, and its characteristic is that the cyclone (9) bottom the large fraction heading towards section 5 due to gravity and / or within the system through the cyclone return (11) to the grinder chamber due to the effect of the pressure difference (5) conveying and the grinding chamber of the coarse fraction in question (5), suction– discharge fan (8), return line (7), cyclone (9) and cyclone return (11) in the closed product circulation loop created through it multiple times Grinding between fixed gear (3) and rotary bevel gear (4) by circulating 10 It is the passage through the region more than once.
14. Closed circuit grinding method according to claim 13, its characteristic is; with fixed gear (3) Diameter adjustment bolt of radial grinding clearance between rotary bevel gear (4) (6) by changing the flow control element associated with the cyclone (9) Changing its position via the cyclone adjustment lever (10) is separate from each other 15 mechanical adjustments are performed and these mechanical adjustments This refers to changes made during operation or separately between different operations. 25