A particle size classification grinding device for flame retardant processing

Abstract

The invention relates to the technical field of sanding and grading equipment, and in particular to a particle size grading sanding device for flame retardant processing; the device can meet the grinding needs of multi-diameter flame retardant particles, effectively reduce the occurrence of material blocking equipment, realize synchronous processing of material particle classification after grinding during the grinding process, and greatly improve the grinding efficiency; the device comprises a casing, a main shaft rotatably installed in the casing, a bracket fixedly installed in the upper part of the casing, a rotating lifting seat slidably installed on the bracket and rotatably connected to the bracket, a grinding cone fixedly installed on the rotating lifting seat, a grinding sleeve installed in the casing and matched with the grinding cone, an elastic support installed at the bottom of the rotating lifting seat, a telescopic transmission shaft and a first sieve plate fixedly installed on the rotating lifting seat, a motor for driving the main shaft to rotate is installed on the casing, a supporting plate matched with the inner wall of the casing is installed on the main shaft, and a first discharge port arranged corresponding to the supporting plate is provided on the casing.

Description

Technical Field

[0001] The invention relates to the technical field of sandblasting and grading equipment, in particular to a particle size grading sandblasting device for flame retardant processing. Background Art

[0002] As we all know, flame retardant particles (bromine / halogen) are one of the best flame retardant products in plastics, rubber and other resins. Flame retardant particles (masterbatch) are a granular product made by organically combining, modifying and synergizing multiple flame retardant ingredients on the basis of flame retardants, and mixing, extruding and granulating through a twin-screw or three-screw extruder. In the early stage of flame retardant production, the particles are large in size and need to be graded and frosted.

[0003] For example, Chinese invention patent CN115845975B discloses a multi-stage grinding device for polymer chemical material particles; it includes a shell, the shell is a cylindrical structure, a large screening frame, a medium screening frame and a small screening frame are installed on the upper part of the inner wall of the shell, and arc plates are installed between the large screening frames, the medium screening frames and the small screening frames, and a transmission mechanism is installed on the inner wall of the shell. The transmission mechanism is connected to the first small bevel gear and the second rotating shaft, and the first small bevel gear is fixedly connected to the first rotating shaft. A separation disk is installed on the upper end of the first rotating shaft, and the upper end of the separation disk is slidably connected to the lower end of the large screening frame. It first screens the polymer chemical materials by size, then transforms the gap between the grinding wheel and the grinding box wall, adjusts the feeding order of materials of different sizes, reduces the blocking of large particles by small particles, and finally completes the graded grinding, effectively improving the grinding efficiency.

[0004] However, when the inventors implemented this device, they found the following defects: material blockage is likely to occur between the grinding wheel and the inner wall of the grinding box, which increases the frequency of shutdowns for maintenance and affects the grinding efficiency of the material; and the particle sizes of the flame retardant particles after grinding are different and require secondary grading treatment, which has certain limitations in use. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a particle size grading sanding device for flame retardant processing that meets the grinding needs of multi-size flame retardant particles, effectively reduces the occurrence of material clogging equipment, realizes simultaneous classification and processing of material particles after grinding during the grinding process, and greatly improves the grinding efficiency.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a particle size grading sanding device for flame retardant processing, comprising a casing, a main shaft rotatably mounted in the casing, a bracket fixedly mounted in the upper part of the casing, a rotating lifting seat slidably mounted on the bracket and rotatably connected to the bracket, a grinding cone fixedly mounted on the rotating lifting seat, a grinding sleeve mounted in the casing and matched with the grinding cone, an elastic support member mounted at the bottom of the rotating lifting seat, a telescopic transmission shaft and a first sieve plate fixedly mounted on the rotating lifting seat, a motor for driving the main shaft to rotate is mounted on the casing, the main shaft is transmission-connected to the rotating lifting seat through the telescopic transmission shaft, a supporting plate matching with the inner wall of the casing is mounted on the main shaft, a first discharge port arranged corresponding to the supporting plate is provided on the casing, the rotating lifting seat is elastically connected to the bracket through the elastic support member, a second discharge port is provided on the casing corresponding to the first sieve plate, and a hopper is provided on the top of the grinding sleeve; further, the motor is transmission-connected to the main shaft through a transmission belt; the elastic support member provides upward elastic support for the rotating lifting seat.

[0009] Preferably, the elastic support member includes a spring, a slider and a ball rotatably mounted on the slider, the rotary lifting seat is provided with a slide groove that fits with the slider, the slider is installed in the slide groove for sliding up and down, one end of the spring is fixedly connected to the top of the slide groove, the other end of the spring is fixedly connected to the slider, the bracket is provided with a ring rail, and the ball is located in the ring rail.

[0010] Preferably, the casing is provided with a closing portion with a top port smaller than the bottom port, there are multiple second discharge ports, the multiple second discharge ports are located at the closing portion and are evenly distributed around the closing portion, a receiving bucket is hingedly installed on the casing, and the casing is provided with a material guiding channel at one end connected to the second discharge port and the other end extending into the receiving bucket, the discharge end of the receiving bucket is arranged to be tilted downward, and a tension spring is hingedly installed on the receiving bucket, and the receiving bucket is elastically connected to the closing portion through the tension spring; further, one end of the tension spring is hinged to the receiving bucket, and the other end of the tension spring is hinged to the outer wall of the closing portion.

[0011] Preferably, the top surface of the first sieve plate is gradually inclined downward from the middle to the edge, and the support plate is a convex plate with a convex middle portion.

[0012] Preferably, the grinding sleeve is slidably installed on the upper part of the casing, a first adjusting bolt is screwed on the casing, and the grinding sleeve is locked with the casing by the first adjusting bolt.

[0013] Preferably, a spiral roller is provided on the top of the grinding cone; further, a spiral guide vane is provided on the spiral roller.

[0014] Preferably, a roller screen mechanism is installed on the top of the hopper, and the roller screen mechanism includes a connecting shaft fixedly connected to the spiral roller, a second sieve plate fixedly installed on the top of the connecting shaft, a barrel fixedly installed on the hopper, a horizontal axis installed on the barrel, and a pressure wheel rotatably installed on the horizontal axis.

[0015] Preferably, the transverse axis is slidably mounted on the barrel, and a second adjusting bolt is rotatably mounted on the barrel, and the second adjusting bolt is threadedly connected to the transverse axis.

[0016] Preferably, the grinding sleeve is provided with first grinding ribs and second grinding ribs uniformly distributed in the circumferential direction, the outer dimensions of the first grinding ribs are larger than those of the second grinding ribs, a plurality of the first grinding ribs form a cone-shaped body with an upper opening larger than a lower opening, a plurality of the second grinding ribs form a cone-shaped body with an upper port smaller than a lower port, and the grinding cone is provided with spiral ribs; further, the cone-shaped body formed by the second grinding ribs fits with the outer wall of the grinding cone.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a particle size grading sanding device for flame retardant processing, which has the following beneficial effects: in the particle size grading sanding device for flame retardant processing, flame retardant particle materials enter into the hopper, the motor drives the main shaft to rotate, and after the transmission of the telescopic transmission shaft, the rotating lifting seat drives the grinding cone to rotate, and flame retardant particle materials of different particle sizes enter between the grinding cone and the grinding sleeve. Under the action of the elastic support, the distance between the grinding sleeve and the grinding cone changes, and the grinding cone performs a high-frequency and small-amplitude vibration movement up and down while rotating. Large-size flame retardant particle materials are crushed between the grinding cone and the grinding sleeve, and the grinding cone vibrates the large-size flame retardant particle materials in the process of low-amplitude vibration. The granular flame retardant material forms a hammering effect, which is conducive to the large-particle flame retardant material being broken into small particles; the large-particle flame retardant material after grinding and breaking falls onto the first sieve plate, and the first sieve plate vibrates up and down while following the rotation of the rotating lifting seat. Under the action of vibration, the first sieve plate intercepts the large-particle flame retardant, and the small-particle flame retardant falls to the supporting plate and is discharged through the first discharge port. The centrifugal force generated during the rotation of the first sieve plate discharges the intercepted large-particle flame retardant from the second discharge port, meeting the grinding needs of multi-particle flame retardant particles, effectively reducing the occurrence of material clogging equipment, and realizing synchronous processing of material particle classification after grinding during the grinding process, greatly improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 It is a front plan view structural schematic diagram of the present invention;

[0021] Figure 3 The present invention Figure 2 Schematic diagram of the cross-section structure at AA in the middle;

[0022] Figure 4 The present invention Figure 3 Schematic diagram of the cross-section structure at BB in the middle;

[0023] Figure 5 The present invention Figure 3 A schematic diagram of the partially enlarged structure at C in the middle;

[0024] Figure 6 The present invention Figure 4 The schematic diagram of the local enlarged structure at D in the middle;

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the grinding cone, the grinding sleeve and the roller screen mechanism of the present invention in a cut-away state;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the telescopic transmission shaft of the present invention;

[0027] Markings in the attached drawings: 1. casing; 2. main shaft; 3. bracket; 4. rotating lifting seat; 5. grinding cone; 6. grinding sleeve; 7. telescopic transmission shaft; 8. first sieve plate; 9. motor; 10. supporting plate; 11. first discharge port; 12. second discharge port; 13. hopper; 14. spring; 15. slider; 16. sphere; 17. ring rail; 18. closing part; 19. receiving bucket; 20. material guiding channel; 21. tension spring; 22. first adjusting bolt; 23. spiral roller; 24. connecting shaft; 25. second sieve plate; 26. barrel; 27. horizontal axis; 28. pressure wheel; 29. ​​second adjusting bolt; 30. first grinding ridge; 31. second grinding ridge; 32. spiral ridge. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only embodiments of a part of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the invention.

[0029] As described in the background technology, a multi-stage grinding device for polymer chemical material particles is used; material blockage is prone to occur between the grinding wheel and the inner wall of the grinding box, which increases the frequency of shutdowns and maintenance and affects the grinding efficiency of the material; and the particle sizes of the flame retardant particles after grinding are different and need to be subjected to secondary classification treatment, which has certain limitations in use.

[0030] In order to solve this technical problem, the present invention provides a particle size classification grinding device for flame retardant processing, which is used for grinding flame retardant materials with different particle sizes.

[0031] Specifically, please refer to Figure 1-3 The particle size classification grinding device for flame retardant processing specifically includes: a housing 1, a main shaft 2 rotatably installed in the housing 1, a bracket 3 fixedly installed in the upper part of the housing 1, a rotating lifting seat 4 slidably installed on the bracket 3 and rotatably connected to the bracket 3, a grinding cone 5 fixedly installed on the rotating lifting seat 4, a grinding sleeve 6 installed in the housing 1 and matching the grinding cone 5, an elastic support installed at the bottom of the rotating lifting seat 4, a telescopic transmission shaft 7 and a first sieve plate 8 fixedly installed on the rotating lifting seat 4, and a main shaft 2 is installed on the housing 1 for driving the main shaft. 2 is rotated by a motor 9, the main shaft 2 is connected to the rotary lifting seat 4 through a telescopic transmission shaft 7, a supporting tray 10 that fits with the inner wall of the casing 1 is installed on the main shaft 2, and a first discharge port 11 arranged corresponding to the supporting tray 10 is provided on the casing 1. The rotary lifting seat 4 is elastically connected to the supporting seat 3 through an elastic support member, a second discharge port 12 is provided on the casing 1 corresponding to the first sieve plate 8, and a hopper 13 is provided on the top of the grinding sleeve 6; further, the motor 9 is connected to the main shaft 2 through a transmission belt; the elastic support member provides upward elastic support for the rotary lifting seat 4.

[0032] The particle size grading sanding device for flame retardant processing provided by the present invention can meet the grinding needs of flame retardant particles with multiple particle sizes, effectively reduce the occurrence of material clogging equipment, and realize synchronous processing of material particle grading after grinding during the grinding process, thereby greatly improving the grinding efficiency.

[0033] It should be noted that, in the absence of conflict, the embodiments of the invention and the features and technical solutions in the embodiments may be combined with each other.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] Example 1

[0036] Please refer to Figure 1-4, a particle size grading sanding device for flame retardant processing, which includes a casing 1, a main shaft 2 rotatably mounted in the casing 1, a bracket 3 fixedly mounted on the upper inner part of the casing 1, a rotating lifting seat 4 slidably mounted on the bracket 3 and rotatably connected to the bracket 3, a grinding cone 5 fixedly mounted on the rotating lifting seat 4, a grinding sleeve 6 mounted in the casing 1 and matched with the grinding cone 5, an elastic support member mounted at the bottom of the rotating lifting seat 4, a telescopic transmission shaft 7 and a first sieve plate 8 fixedly mounted on the rotating lifting seat 4, a motor 9 for driving the main shaft 2 to rotate is mounted on the casing 1, the main shaft 2 is transmission-connected to the rotating lifting seat 4 through the telescopic transmission shaft 7, a supporting plate 10 matched with the inner wall of the casing 1 is mounted on the main shaft 2, a first discharge port 11 arranged corresponding to the supporting plate 10 is provided on the casing 1, the rotating lifting seat 4 is elastically connected to the bracket 3 through the elastic support member, a second discharge port 12 is provided on the casing 1 corresponding to the first sieve plate 8, and a hopper 13 is provided on the top of the grinding sleeve 6.

[0037] For details, please refer to Figure 6-7 The elastic support member includes a spring 14, a slider 15 and a ball 16 rotatably mounted on the slider 15. A slide groove matching the slider 15 is provided on the rotary lifting seat 4. The slider 15 is installed in the slide groove to slide up and down. One end of the spring 14 is fixedly connected to the top of the slide groove, and the other end of the spring 14 is fixedly connected to the slider 15. A ring rail 17 is provided on the bracket 3, and the ball 16 is located in the ring rail 17.

[0038] For details, please refer to Figure 4 and Figure 7 The casing 1 is provided with a closing portion 18 whose top port is smaller than the bottom port, and there are multiple second discharge ports 12, which are located at the closing portion 18 and are evenly distributed around the closing portion 18. A receiving bucket 19 is hingedly installed on the casing 1, and a material guiding channel 20 is provided on the casing 1 at one end which is connected to the second discharge port 12 and the other end which extends into the receiving bucket 19. The discharge end of the receiving bucket 19 is arranged to be tilted downward, and a tension spring 21 is hingedly installed on the receiving bucket 19, and the receiving bucket 19 is elastically connected to the closing portion 18 through the tension spring 21; further, one end of the tension spring 21 is hinged to the receiving bucket 19, and the other end of the tension spring 21 is hinged to the outer wall of the closing portion 18.

[0039] For details, please refer to Figure 3 or Figure 4 The top surface of the first sieve plate 8 gradually slopes downward from the middle to the edge, and the support plate 10 is a convex plate with a convex middle portion.

[0040] For details, please refer to Figure 5-7The grinding sleeve 6 is provided with first grinding ribs 30 and second grinding ribs 31 uniformly distributed in the circumferential direction, the outer dimensions of the first grinding ribs 30 are larger than those of the second grinding ribs 31, a plurality of first grinding ribs 30 form a conical body with an upper opening larger than a lower opening, a plurality of second grinding ribs 31 form a conical body with an upper port smaller than a lower port, and a spiral rib 32 is provided on the grinding cone 5; further, the cone body formed by the second grinding ribs 31 fits with the outer wall of the grinding cone 5.

[0041] For details, please refer to Figure 7 A spiral roller 23 is provided on the top of the grinding cone 5; further, a spiral guide vane is provided on the spiral roller 23.

[0042] The particle size classification grinding device for flame retardant processing provided in this embodiment can cause the rotating lifting seat 4 to move upward under the action of the spring 14 to ensure that the flame retardant particle material is ground and crushed between the grinding cone 5 and the grinding sleeve 6, and the ball 16 can reduce the friction between the rotating lifting seat 4 and the bracket 3; the elastic support members are evenly distributed around the rotating lifting seat 4 to provide balanced support for the rotating lifting seat 4; the flame retardant particle material trapped on the first sieve plate 8 is moved upward under the action of vibration and centrifugal force. Figure 3 The flame retardant particles move in the direction of the middle arrow, and the closing portion 18 can facilitate the flame retardant particles to enter the guide channel 20 through the second discharge port 12, and the flame retardant particles fall into the receiving bucket 19 through the guide channel 20. During the operation of the graded sanding device, the entire housing 1 will vibrate, and the receiving bucket 19 will shake under the vibration, so that the flame retardant particles that fall into the receiving bucket 19 are smoothly discharged, and the flame retardant particles in the receiving bucket 19 are reduced. The top surface of the first sieve plate 8 gradually tilts downward from the middle to the edge, and the support plate 10 adopts a convex plate with a convex middle part, which can facilitate the first sieve plate 8 and the material on the support plate 10. The flame retardant particles are centrifugally thrown out, and at the same time, the residue of the material on the first sieve plate 8 and the support plate 10 is effectively reduced; the cone body enclosed by the first grinding ribs 30 can promote the flame retardant particle material to enter between the second grinding ribs 31 and the spiral ribs 32, and the grinding cone 5 drives the spiral roller 23 to rotate during the rotation process, and under the action of the spiral roller 23, the flame retardant particle material can be promoted to enter between the second grinding ribs 31 and the spiral ribs 32, and the spiral ribs 32 can grind and crush the flame retardant particle material while also having a certain material guiding effect on the flame retardant material, so as to promote the ground flame retardant particle material to move downward from between the grinding cone 5 and the grinding sleeve 6.

[0043] Example 2

[0044] The particle size classification sanding device for flame retardant processing provided in Example 1 is further optimized. For details, please refer to Figure 2 and Figure 3The grinding sleeve 6 is mounted on the upper part of the casing 1 so as to slide up and down. A first adjusting bolt 22 is screwed on the casing 1. The grinding sleeve 6 is locked with the casing 1 by the first adjusting bolt 22.

[0045] For details, please refer to Figure 4 or Figure 5 A roller screen mechanism is installed on the top of the hopper 13, and the roller screen mechanism includes a connecting shaft 24 fixedly connected to the spiral roller 23, a second sieve plate 25 fixedly installed on the top of the connecting shaft 24, a barrel 26 fixedly installed on the hopper 13, a horizontal shaft 27 installed on the barrel 26, and a pressure wheel 28 rotatably installed on the horizontal shaft 27.

[0046] For details, please refer to Figure 5 The horizontal shaft 27 is installed on the barrel 26 for sliding up and down. A second adjusting bolt 29 is rotatably installed on the barrel 26 , and the second adjusting bolt 29 is threadedly connected to the horizontal shaft 27 .

[0047] The particle size grading sanding device for flame retardant processing provided in this embodiment can adjust the gap size between the grinding sleeve 6 and the grinding cone 5 by moving the grinding sleeve 6 up and down, so as to further meet the grinding needs of particle flame retardants with different particle sizes in a wider range. After the installation height of the grinding sleeve 6 is adjusted, it is locked by the first adjusting bolt 22; the flame retardant particle material is put into the barrel 26 in advance, and the spiral roller 23 drives the connecting shaft 24 and the second sieve plate 25 to rotate when the spiral roller 23 rotates, and the pressure wheel 28 can press the particle flame retardant on the second sieve plate 25 into the sieve holes on the second sieve plate 25, and the pressure of the pressure wheel 28 The particulate flame retardant is initially crushed under the action of the shear force during force grinding and the rotation of the second sieve plate 25 to reduce the difference in particle size of the particulate flame retardant entering the grinding cone 5 and the grinding sleeve 6. The horizontal axis 27 can be moved up and down to adaptively adjust the distance between the pressure wheel 28 and the second sieve plate 25 as needed to adjust the initial grinding particle size of the flame retardant particles. The preliminary grinding and screening of the particulate flame retardant by the roller screen mechanism can further reduce the incidence of blockage between the subsequent grinding cone 5 and the grinding sleeve 6, which plays a positive role in improving the grinding efficiency of the flame retardant particles.

[0048] The use process of the particle size grading sanding device for flame retardant processing provided by the present invention is as follows: the particle flame retardant is placed in the barrel 26 and is initially ground and screened by a roller screen mechanism. The flame retardant particle material after initial treatment enters the hopper 13, and the motor 9 drives the main shaft 2 to rotate. After the transmission is transmitted by the telescopic transmission shaft 7, the rotating lifting seat 4 drives the grinding cone 5 to rotate. Flame retardant particle materials of different particle sizes enter between the grinding cone 5 and the grinding sleeve 6. Under the action of the elastic support, the distance between the grinding sleeve 6 and the grinding cone 5 changes. The grinding cone 5 performs a high-frequency and small-amplitude vibration movement up and down while rotating. The large-size flame retardant particle material is broken and ground between the grinding cone 5 and the grinding sleeve 6, and the grinding cone 5 vibrates the large particles during the low-amplitude vibration process. The flame retardant material forms a hammering effect, which is conducive to the large-particle flame retardant material being broken into small particles; the large-particle flame retardant material after grinding and breaking falls onto the first sieve plate 8, and the first sieve plate 8 vibrates up and down while following the rotation of the rotating lifting seat 4. Under the action of vibration, the first sieve plate 8 intercepts the large-particle flame retardant, and the small-particle flame retardant falls to the supporting plate 10 and is discharged through the first discharge port 11. The centrifugal force generated during the rotation of the first sieve plate 8 discharges the intercepted large-particle flame retardant from the second discharge port 12. The large-particle flame retardant discharged through the second discharge port 12 and the guide channel 20 falls to the receiving bucket 19 and then falls down, and the particle flame retardants of various particle sizes can be collected.

[0049] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

Claims

1. A particle size classification sanding device for flame retardant processing, characterized in that: The invention comprises a casing (1), a main shaft (2) rotatably mounted in the casing (1), a bracket (3) fixedly mounted in the upper part of the casing (1), a rotating lifting seat (4) slidably mounted on the bracket (3) and rotatably connected to the bracket (3), a grinding cone (5) fixedly mounted on the rotating lifting seat (4), a grinding sleeve (6) mounted in the casing (1) and matched with the grinding cone (5), an elastic support member mounted at the bottom of the rotating lifting seat (4), a telescopic transmission shaft (7) and a first sieve plate (8) fixedly mounted on the rotating lifting seat (4), wherein the casing (1) is mounted A motor (9) is provided for driving the main shaft (2) to rotate. The main shaft (2) is connected to the rotary lifting seat (4) through a telescopic transmission shaft (7). A material support tray (10) that fits with the inner wall of the casing (1) is installed on the main shaft (2). The casing (1) is provided with a first discharge port (11) arranged corresponding to the material support tray (10). The rotary lifting seat (4) is elastically connected to the support seat (3) through an elastic support. A second discharge port (12) is provided on the casing (1) at a position corresponding to the first sieve plate (8). A hopper (13) is provided on the top of the grinding sleeve (6); The elastic support member comprises a spring (14), a slider (15) and a ball (16) rotatably mounted on the slider (15); a slide groove matching the slider (15) is provided on the rotary lifting seat (4); the slider (15) is slidably mounted in the slide groove; one end of the spring (14) is fixedly connected to the top of the slide groove; the other end of the spring (14) is fixedly connected to the slider (15); a ring rail (17) is provided on the bracket (3); and the ball (16) is located in the ring rail (17); The casing (1) is provided with a closing portion (18) whose top port is smaller than the bottom port, the second discharge ports (12) are multiple, the multiple second discharge ports (12) are located at the closing portion (18) and are evenly distributed around the closing portion (18), the casing (1) is hingedly mounted with a receiving bucket (19), the casing (1) is provided with a material guiding channel (20) having one end connected to the second discharge port (12) and the other end extending into the receiving bucket (19), the discharge end of the receiving bucket (19) is arranged to be tilted downward, the receiving bucket (19) is hingedly mounted with a tension spring (21), and the receiving bucket (19) is elastically connected to the closing portion (18) via the tension spring (21).

2. The particle size classification sanding device for flame retardant processing according to claim 1, characterized in that: The top end surface of the first sieve plate (8) gradually slopes downward from the middle to the edge, and the support plate (10) is a convex plate with a convex middle portion.

3. The particle size classification sanding device for flame retardant processing according to claim 1, characterized in that: The grinding sleeve (6) is slidably mounted on the upper part of the casing (1) up and down, a first adjustment bolt (22) is screwed onto the casing (1), and the grinding sleeve (6) is locked to the casing (1) via the first adjustment bolt (22).

4. The particle size classification sanding device for flame retardant processing according to claim 3, characterized in that: A spiral roller (23) is provided on the top of the grinding cone (5).

5. The particle size classification sanding device for flame retardant processing according to claim 4, characterized in that: A roller screen mechanism is installed on the top of the hopper (13), and the roller screen mechanism comprises a connecting shaft (24) fixedly connected to the spiral roller (23), a second screen plate (25) fixedly installed on the top of the connecting shaft (24), a barrel (26) fixedly installed on the hopper (13), a horizontal shaft (27) installed on the barrel (26), and a pressure wheel (28) rotatably installed on the horizontal shaft (27).

6. The particle size classification sanding device for flame retardant processing according to claim 5, characterized in that: The transverse shaft (27) is mounted on the barrel (26) in a manner that it can slide up and down. A second adjusting bolt (29) is rotatably mounted on the barrel (26). The second adjusting bolt (29) is threadedly connected to the transverse shaft (27).

7. The particle size classification sanding device for flame retardant processing according to claim 1, characterized in that: The grinding sleeve (6) is provided with first grinding ridges (30) and second grinding ridges (31) uniformly distributed in the circumferential direction, the first grinding ridges (30) have outer dimensions larger than those of the second grinding ridges (31), a plurality of the first grinding ridges (30) form a conical body with an upper opening larger than a lower opening, a plurality of the second grinding ridges (31) form a conical body with an upper port smaller than a lower port, and the grinding cone (5) is provided with spiral ridges (32).

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