CN219291511U

CN219291511U - Three-roller grinder with chemical raw material crushing pretreatment and discharging screening device

Info

Publication number: CN219291511U
Application number: CN202223019193.4U
Authority: CN
Inventors: 常怀春; 苏海涛; 孔翠
Original assignee: Shandong Hualu Hengsheng Chemical Co Ltd
Current assignee: Shandong Hualu Hengsheng Chemical Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-07-04
Anticipated expiration: 2032-11-14

Abstract

The utility model provides a three-roller mill with industrial chemicals crushing pretreatment and ejection of compact screening plant, including the workstation and install in the three-roller mill of its upside, raw materials preprocessing device and raw materials screening plant, and set up the collection box in raw materials screening plant below, raw materials preprocessing device comprises crushing room, the support, the discharging pipe, several crushing roller and crushing driving motor, crushing room inside has the crushing chamber, its upper and lower part has into, the discharge gate, the support is installed in the upper portion of three-roller mill, the crushing room is installed in the upper portion of support, the discharge gate is connected to the discharging pipe upper end, its lower extreme communicates with each other with the feed inlet of three-roller mill, this several crushing roller is installed in the crushing chamber, crushing driving motor installs in crushing room lateral wall and is connected with crushing roller drive, crushing driving motor drives crushing roller rotation in order to carry out crushing pretreatment to the industrial chemicals that gets into the crushing chamber, thereby can effectively promote three-roller mill to industrial chemicals's grinding efficiency and quality, thereby improve production efficiency.

Description

Three-roller grinder with chemical raw material crushing pretreatment and discharging screening device

Technical Field

The utility model relates to a grinding device, in particular to a three-roller grinding machine with a chemical raw material crushing pretreatment and discharging screening device.

Background

Chemical industry is the abbreviation of terms "chemical process", "chemical industry", "chemical engineering", etc. The chemical production technology, i.e. chemical process, refers to the product obtained by changing the composition, structure or synthesizing new substances by chemical methods. Initially, the sites for producing chemical products were mostly hand workshops, which later evolved into factories and gradually developed into a specific production industry, i.e., chemical industry.

The present chemical products often need to use a grinding device during production, for example, a three-roller grinder widely used in many fields, the specific structure of the three-roller grinder can be referred to in the technical bulletin No. CN2210709Y, the scheme of the three-roller grinder is named as the three-roller grinder, according to the scheme content, the three-roller grinder consists of a transmission system, a three-roller working system, a pressurizing system, a separation discharging system, a feeding system, a cooling system, a safety system, a blade abrasion automatic resetting system, a detection system, an anti-return system and an alternating current variable frequency stepless speed regulating system, and because fine slurry is concentrated in the middle of a roller and coarse slurry is concentrated at two ends of the roller during the three-roller working, the three-roller grinder needs to separate the discharging system to flow the ground slurry products into different containers respectively. In addition, the bulletin number is CN201470416U, the name is a scheme of a three-roller grinder with a material distributing device, according to the scheme content, the three-roller grinder with the material distributing device mainly comprises a machine base and three rollers with different rotating speeds, wherein the rollers are arranged on a bearing seat at the upper end of the machine base, each roller comprises a slow roller, a middle roller and a fast roller, a copper knife is further arranged on the inner wall of the bearing seat perpendicular to the central position between the slow roller and the middle roller, a transmission mechanism arranged at one end of the fast roller is connected with a motor transmission shaft arranged in the machine base by a transmission device and is in meshed transmission with the rollers by a transmission gear, a discharging device is arranged on the machine base close to the wall of the fast roller, and two separation strips for separating paint materials are arranged in the discharging device, wherein the area of a middle separation area is larger than that of separation areas at two sides. According to the structure of the existing three-roller grinding machine, the existing three-roller grinding machine is not provided with a raw material pre-crushing device, so that the massive chemical raw materials cannot be subjected to crushing pretreatment before grinding, the massive chemical raw materials are required to be crushed in advance in a manual mode, time and labor are wasted, grinding efficiency is affected, part of the ground chemical raw materials still have larger particles, the existing three-roller grinding machine can separate the raw materials with different particle sizes only through a separation discharging system or a discharging device with a separation strip, and in the separation process, the raw materials with different particle sizes cannot be mixed together by only depending on a separation means of a discharging area, so that the fine and uniform discharging particle sizes cannot be ensured, inconvenience is brought to subsequent production, and the production efficiency is seriously reduced.

Therefore, developing a grinding device that can pre-crush and pre-treat bulk chemical raw materials before grinding and make the granularity of the ground discharged raw materials fine and uniform has become one of the technical problems to be solved in the art.

Disclosure of Invention

The technical problem that this technical scheme to solve is, how to provide one kind and can carry out broken pretreatment operation to industrial chemicals in advance before lapping industrial chemicals to with cubic or industrial chemicals that the granularity is great broken into industrial chemicals that the granularity is less, with the grinding operation that is favorable to three-roller to grind the machine, and make the granularity of industrial chemicals after being ground finer and even, thereby make follow-up industrial chemicals's production more smooth and easy, the quality is better, and can improve production efficiency's three-roller to grind the machine.

In order to solve the technical problem, the technical scheme provides a three-roller grinder with chemical raw material crushing pretreatment and discharging screening device, which comprises a three-roller grinder, a workbench, a material collecting box and a raw material pretreatment device, wherein the three-roller grinder is arranged on the upper side surface of the workbench, a material collecting box is arranged below a discharging plate of the three-roller grinder, the raw material pretreatment device mainly comprises a crushing chamber, a bracket, a discharging pipe, a plurality of crushing rollers and a crushing driving motor, wherein the crushing chamber is internally provided with a crushing cavity, the upper part and the lower part of the crushing chamber are respectively provided with a feeding hole and a discharging hole which are communicated with the crushing cavity, the bracket is arranged on the upper part of the three-roller grinder, the crushing chamber is arranged on the upper end of the discharging pipe and is communicated with a feeding hole of the three-roller grinder, the crushing rollers are arranged side by side and are rotatably arranged in the crushing cavity, and the crushing driving motor is arranged on the outer side surface of the side wall of the crushing chamber and is in driving connection with the crushing rollers so as to drive the crushing rollers to rotate, and the crushing driving rollers to carry out chemical raw material pretreatment through the feeding hole in the crushing chamber. Accordingly, the chemical raw materials with large block or particle size can be crushed into chemical raw materials with small particle size in advance through the raw material pretreatment device, so that the grinding operation of the three-roller grinder is facilitated, the particle size of the grinded chemical raw materials is finer and more uniform, the production of subsequent chemical products is smoother, the quality is better, and the production efficiency is improved.

As another implementation of the technical scheme, the raw material pretreatment device further comprises a mounting seat, wherein the mounting seat is arranged on the outer side face of the side wall of the crushing chamber, the number of the crushing rollers and the number of the crushing driving motors are two, the two crushing rollers are axially penetrated and fixed with rotating shafts, two end parts of the rotating shafts are rotatably arranged on two opposite side walls of the crushing chamber through bearings, one end part of each rotating shaft penetrates out of the side wall, the two crushing driving motors are arranged on the mounting seat, driving ends of the two crushing driving motors are respectively connected with the end parts of the two rotating shafts penetrating out of the side walls, and the two rotating shafts drive the two crushing rollers to rotate in opposite directions through driving of the two crushing driving motors. Accordingly, the two oppositely rotating crushing rollers can easily crush and crush the massive or large-granularity chemical raw materials into the chemical raw materials with small granularity.

As another implementation of the technical scheme, the raw material pretreatment device further comprises a flip cover, wherein one edge of the flip cover is hinged to one edge of the feed inlet, so that the flip cover can be opened or closed by taking the hinged part as an axis. Therefore, after chemical raw materials are put into the turnover cover and the turnover cover is arranged at the feed inlet, raw material dust generated during the crushing pretreatment of the chemical raw materials can be effectively prevented from drifting around.

As another implementation of the technical scheme, the bottom of the crushing cavity is concave downwards, the discharge hole is positioned at the lowest part of the bottom of the crushing cavity, the lower end part of the discharge pipe is provided with an inverse funnel-shaped flaring part, and the flaring part is accommodated in the feed inlet of the three-roller grinder. Accordingly, the bottom of the crushing cavity with the concave shape is more beneficial to the collection and transportation of the chemical raw materials after the crushing pretreatment, and the flaring part with the inverted funnel shape can prevent the chemical raw materials from splashing and drifting when being transported to the feed inlet of the three-roller grinder.

As another implementation of the technical scheme, the three-roller grinding machine with the chemical raw material crushing pretreatment and discharging screening device further comprises a raw material screening device, wherein the raw material screening device is arranged on the upper side surface of the workbench and is located below a discharging plate of the three-roller grinding machine, a screening outlet is formed in the lower portion of the raw material screening device, a through discharging opening is formed in the workbench, corresponding to the screening outlet, a hopper-shaped discharging hopper is arranged in the lower portion of the discharging opening, a material opening is formed in the bottom of the discharging hopper, and a material collecting box is arranged below the material opening. Accordingly, the raw material screening device can screen the chemical raw materials ground by the three-roller grinder, so that the chemical raw materials with qualified particle size are collected into the aggregate box through the blanking hopper.

As another implementation of the technical scheme, the raw material screening device mainly comprises two guide plates, a screening frame, screening discs and a reciprocating device, wherein the guide plates are rectangular plate bodies, the plate surfaces of the two guide plates are opposite and parallel and fixedly combined to the upper side surface of a workbench and positioned at two sides of a blanking opening, sliding grooves are correspondingly formed in the opposite plate surfaces of the two guide plates, the screening frame is a rectangular frame body and forms a through opening in the middle, the lower part of the through opening forms a screening outlet, sliding parts are correspondingly arranged on the outer side surfaces of the frame plates at two sides of the screening frame, the screening frame is correspondingly embedded in the sliding grooves of the two guide plates by the sliding parts at two sides so that the screening frame can horizontally slide between the two guide plates, the screening disc is formed by a disc frame in a rectangular frame shape and a screen mesh arranged in the disc frame, the reciprocating device is arranged on the upper side surface of the workbench and positioned at the side of the two guide plates, and the reciprocating device is connected with the screening frame to drive the screening frame to horizontally reciprocate. Accordingly, the chemical raw materials ground by the three-roller grinder fall into the screening disc through the discharging plate, the screening disc is driven to horizontally reciprocate to enable the chemical raw materials with qualified particle sizes to fall through the screen mesh, the chemical raw materials with larger particle sizes are retained on the screen mesh, and then the chemical raw materials in the screening disc can be poured into the three-roller grinder again for repeated grinding after the screening disc is disassembled.

As another implementation of the technical scheme, the reciprocating device is composed of a ㄩ -shaped frame, a ball nut pair, a reciprocating driving motor and a reciprocating screw rod, wherein the end parts of two side plates of the ㄩ -shaped frame are fixedly combined on the outer side surfaces of frame plates of adjacent screening frames, the ball nut pair is fixedly arranged on a transverse plate of the ㄩ -shaped frame in a penetrating mode, the reciprocating driving motor is arranged on the upper side surface of a workbench, and the reciprocating screw rod is arranged in the ball nut pair in a threaded mode and one end of the reciprocating screw rod is connected with the driving end of the reciprocating driving motor. In this way, the ㄩ -shaped frame can drive the screening frame to horizontally reciprocate by the threaded arrangement of the ball nut pair and the reciprocating screw rod and the driving of the reciprocating driving motor.

As another implementation of the technical scheme, the three-roller grinding machine with the chemical raw material crushing pretreatment and discharging screening device further comprises a central control device, wherein the central control device is arranged on the upper side surface of the workbench and is electrically connected with the three-roller grinding machine, the reciprocating driving motor and the crushing driving motor respectively. Therefore, the operation of the three-roller grinder, the raw material pretreatment device and the raw material screening device can be controlled uniformly.

As another implementation of the technical scheme, the raw material screening device further comprises a plurality of fastening rods and fixing pads, the screening frame is far away from the frame plate of the reciprocating device, a plurality of screw holes are uniformly formed in the frame plate of the reciprocating device, the fixing pads are fixed on the inner side face of the frame plate of the reciprocating device, the fastening rods are formed by threaded rods and screwing parts fixed on one end of the threaded rods, the threaded rods of the fastening rods are screwed into the screw holes, and the disc frame is propped against and fastened between the fixing pads in the through holes of the screening frame and the other end of the threaded rods through the screwing parts. Therefore, the screening disc is convenient to install and detach.

As another implementation of the technical scheme, a plurality of supporting feet are uniformly arranged at the periphery of the lower side surface of the workbench. Therefore, the operation stability of the three-roller grinder with the chemical raw material crushing pretreatment and discharging screening device can be ensured.

Drawings

FIG. 1 is a schematic view of an embodiment of a three-roll mill with a chemical crushing pretreatment and discharge screening device of the present utility model;

FIG. 2 is a schematic diagram of a raw material pretreatment apparatus in the present utility model;

FIG. 3 is a schematic view of a screening frame of the present utility model;

fig. 4 is a top cross-sectional view of the shuttle in the present utility model.

Symbol description in the drawings:

1. a three-roller grinder with a chemical raw material crushing pretreatment and discharging screening device; 10. a three-roll grinder; 11. a discharge plate; 12. a feed inlet; 20. a work table; 21. supporting feet; 22. discharging a hopper; 30. a material collecting box; 31. an opening; 40. a raw material pretreatment device; 41. a crushing chamber; 411. a crushing cavity; 42. a feed inlet; 43. a bracket; 44. a discharge pipe; 441. a flared portion; 45. a crushing roller; 46. a crushing driving motor; 47. a mounting base; 48. a flip cover; 50. a raw material screening device; 51. a guide plate; 511. a chute; 52. a screening frame; 521. a through port; 522. a sliding part; 53. a sieving tray; 531. a tray frame; 532. a screen; 54. a fastening rod; 541. a threaded rod; 542. a screwing part; 55. a fixing pad; 60. a reciprocating device; 61. ㄩ shaped frame; 62. a ball nut pair; 63. a reciprocating drive motor; 64. a reciprocating screw rod; 70. and the central control device.

Detailed Description

The detailed description and technical content of the present utility model are described below with reference to the drawings, which are, however, provided for reference and illustration only and are not intended to limit the present utility model.

FIG. 1 is a schematic view of an embodiment of a three-roll mill with a raw chemical crushing pretreatment and discharge screening device according to the present utility model. The three-roller grinder 1 with the chemical raw material crushing pretreatment and discharging screening device comprises a three-roller grinder 10, a workbench 20, a material collecting box 30 and a raw material pretreatment device 40. The three-roller grinder 10 is a common grinding device in the prior art, and the specific structure thereof is not described herein, and the three-roller grinder 10 is mounted on the upper side of the table 20. The workbench 20 can be a plate body with any shape, and a plurality of supporting feet 21 can be uniformly arranged at the periphery of the lower side surface of the workbench, so that the running stability of the three-roller grinding machine 1 with the chemical raw material crushing pretreatment and discharging screening device can be enhanced. The upper portion of the collecting box 30 has an opening 31, and a space for collecting chemical raw materials is provided inside, which is disposed below the discharge plate 11 of the three-roll grinder 10, for collecting the grinded chemical raw materials. The raw material pretreatment device 40 mainly comprises a crushing chamber 41, a bracket 43, a discharging pipe 44, a plurality of crushing rollers 45 and a crushing driving motor 46, wherein the crushing chamber 41 is internally provided with a crushing cavity 411, the upper part and the lower part of the crushing chamber 41 are respectively provided with a feed inlet 42 and a discharge outlet (not shown) which are communicated with the crushing cavity 411, the bracket 43 is arranged at the upper part of the three-roller grinder 10, the crushing chamber 41 is arranged at the upper part of the bracket 43, the upper end of the discharging pipe 44 is connected with the discharge outlet of the crushing chamber 41, the lower end of the discharging pipe 44 is communicated with the feed inlet 12 of the three-roller grinder 10, the crushing rollers 45 are arranged in parallel and rotatably in the crushing cavity 411, the crushing driving motor 46 is arranged on the outer side face of the side wall of the crushing chamber 41 and is in driving connection with the crushing rollers 45, and the crushing driving motor 46 drives the crushing rollers 45 to rotate so as to carry out crushing pretreatment on the chemical raw materials entering the crushing chamber 41 through the feed inlet 42.

Specifically, as shown in fig. 2, the raw material pretreatment device 40 may further include a mounting base 47, and the mounting base 47 is mounted on an outer side surface of a sidewall of the crushing chamber 41. The number of the crushing rollers 45 and the crushing driving motors 46 is two, the two crushing rollers 45 are axially penetrated and fixed with rotating shafts (not shown), two end parts of the rotating shafts are rotatably arranged on two opposite side walls of the crushing chamber 41 through bearings (not shown), one end part of each rotating shaft penetrates out of the side wall, the two crushing driving motors 46 are arranged on the mounting seat 47, the driving ends of the two crushing driving motors 46 are respectively connected with the end parts of the two rotating shafts penetrating out of the side walls, and the two crushing driving motors 46 drive the two crushing rollers 45 to rotate oppositely through the driving of the two crushing driving motors 46 so as to easily crush and crush the massive or large-granularity chemical raw materials into chemical raw materials with smaller granularity. In addition, the raw material pretreatment device 40 may further include a flip cover 48, wherein one edge of the flip cover 48 is hinged to one edge of the feed inlet 42, so that the flip cover 48 can open or close the feed inlet 42 with the hinged position as a shaft, and after chemical raw materials are put into and the flip cover 48 is covered on the feed inlet 42, raw material dust generated during crushing pretreatment of the chemical raw materials can be effectively prevented from drifting around. The bottom of the crushing cavity 411 may also be formed into a concave shape (not shown), the discharge hole is located at the lowest position of the bottom of the crushing cavity 411, the lower end portion of the discharge pipe 44 has an inverse funnel-shaped flaring portion 441, the flaring portion 441 is accommodated in the feed inlet 12 of the three-roller grinder 10, accordingly, the bottom of the crushing cavity 411 with a concave shape is more beneficial to collecting and conveying the chemical raw materials after crushing pretreatment, and the inverse funnel-shaped flaring portion 441 can prevent the chemical raw materials from splashing and drifting when being conveyed to the feed inlet 12 of the three-roller grinder 10.

Referring to fig. 3 and 4, the three-roller grinder 1 with the chemical raw material crushing pretreatment and discharging screening device may further include a raw material screening device 50, where the raw material screening device 50 is installed on the upper side surface of the workbench 20 and located below the discharging plate 11 of the three-roller grinder 10, a screening outlet (not labeled in the drawing) is provided at the lower part of the raw material screening device 50, a through blanking opening (not labeled in the drawing) is provided at the workbench 20 corresponding to the screening outlet, a hopper-shaped blanking hopper 22 is installed at the lower part of the blanking opening, a material opening (not labeled in the drawing) is provided at the bottom of the blanking hopper 22, and the aggregate box 30 is disposed below the material opening. Furthermore, the raw material sieving device 50 is mainly composed of two guiding plates 51, a sieving frame 52, sieving plates 53 and a reciprocating device 60, wherein the guiding plates 51 are rectangular plate bodies, the two guiding plates 51 are oppositely and parallelly fixed on the upper side of the workbench 20 and are positioned at two sides of the discharging opening, the opposite plates of the two guiding plates 51 are horizontally and correspondingly provided with sliding grooves 511, the sieving frame 52 is a rectangular frame body and is provided with a through opening 521 in the middle part, the lower part of the through opening 521 forms the sieving outlet, the outer side faces of the two side frame plates of the sieving frame 52 are correspondingly provided with sliding parts 522, the sieving frame 52 is correspondingly embedded in the sliding grooves 511 of the two guiding plates 51 by the sliding parts 522 at two sides so that the sieving frame 52 can horizontally slide between the two guiding plates 51, the sieving plate 53 is composed of a rectangular frame-shaped plate frame 531 and a sieve 532 arranged in the plate frame 531, the plate frame 531 is detachably arranged in the through hole 521 of the sieving frame 52, the reciprocating device 60 is arranged on the upper side surface of the workbench 20 and is positioned at one side of the two guide plates 51, the reciprocating device 60 is in driving connection with the sieving frame 52 to drive the sieving frame 52 and drive the sieving plate 53 to horizontally reciprocate, accordingly, chemical raw materials ground by the three-roller grinder 10 fall into the sieving plate 53 through the discharge plate 11, the sieving plate 53 is driven to horizontally reciprocate to promote the chemical raw materials with qualified particle size to fall through the sieve 532, chemical raw materials with larger particle size are retained on the sieve 532, and then the chemical raw materials in the sieving plate 53 can be detached and poured into the three-roller grinder 10 again for repeated grinding. Further, as shown in fig. 4, the reciprocating device 60 may be composed of a ㄩ frame 61, a ball nut pair 62, a reciprocating driving motor 63 and a reciprocating screw 64, wherein the ends of two side plates of the ㄩ frame 61 are fixedly connected to the outer side surfaces of the frame plates of the adjacent sieving frames 52, the ball nut pair 62 is fixedly inserted into the cross plate of the ㄩ frame 61, the reciprocating driving motor 63 is mounted on the upper side surface of the table 20, the reciprocating screw 64 is screwed into the ball nut pair 62, one end of the reciprocating screw 64 is connected to the driving end of the reciprocating driving motor 63, and the ball nut pair 62 is screwed with the reciprocating screw 64 and driven by the reciprocating driving motor 63 to enable the ㄩ frame 61 to drive the sieving frames 52 to reciprocate horizontally. Furthermore, as shown in fig. 3, the raw material screening device 50 may further include a plurality of fastening rods 54 and a fixing pad 55, wherein a plurality of screw holes (not shown) are uniformly formed on a frame plate of the screening frame 52 far from the reciprocating device 60, the fixing pad 55 is fixed on an inner side surface of the frame plate of the screening frame 52 near the reciprocating device 60, the fastening rods 54 are formed by a threaded rod 541 and a screwing portion 542 fixed on one end of the threaded rod 541, the threaded rods 541 of the plurality of fastening rods 54 are screwed into the plurality of screw holes, and the disc frame 531 is tightly pressed and fastened between the fixing pad 55 in the opening 521 of the screening frame 52 and the other end of the threaded rod 541 by screwing the screwing portion 542, so that the installation and the removal of the screening disc 53 can be facilitated, the fixing pad 55 may be a rubber pad, and the other end of the threaded rod 541 may also be provided with a rubber pad body.

In addition, as shown in fig. 1, the three-roller grinding machine 1 with the chemical raw material crushing pretreatment and discharging screening device may further include a central control device 70, where the central control device 70 has a control unit (not shown) and a display unit (not shown) that are electrically connected to each other, the control unit may be various control devices such as an electric control switch, a programmable logic controller, etc., the display unit may be a display panel, a display, etc. and is usually used together with various sensors such as a motor rotation speed sensor, etc., the central control device 70 is installed on the upper side of the workbench 20, and the control unit is electrically connected to the three-roller grinding machine, the reciprocating driving motor and the crushing driving motor respectively to uniformly control the operation of the three-roller grinding machine, the raw material pretreatment device and the raw material screening device, and the display unit is used for displaying relevant data of the operation of the above components.

In summary, the three-roller grinder with the chemical raw material crushing pretreatment and discharging screening device provided by the utility model can crush the chemical raw materials with large blocks or granularity into the chemical raw materials with small granularity in advance through the raw material pretreatment device, so that the grinding operation of the three-roller grinder is facilitated, the granularity of the grinded chemical raw materials is finer and more uniform, the production of subsequent chemical products is smoother, the quality is better, and the production efficiency is improved.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, and other equivalent variations using the inventive concepts are intended to fall within the scope of the utility model.

Claims

1. A three-roll mill with chemical raw material crushing pretreatment and discharge screening device, comprising: the three-roller grinding machine is arranged on the upper side surface of the workbench; characterized by further comprising: the device comprises a raw material pretreatment device and a raw material screening device, wherein the raw material pretreatment device mainly comprises a crushing chamber, a bracket, a discharging pipe, a plurality of crushing rollers and a crushing driving motor, wherein the crushing chamber is internally provided with a crushing cavity, the upper part and the lower part of the crushing chamber are respectively provided with a feeding hole and a discharging hole which are communicated with the crushing cavity, the bracket is arranged on the upper part of the three-roller grinding machine, the crushing chamber is arranged on the upper part of the bracket, the upper end of the discharging pipe is connected with the discharging hole of the crushing chamber, the lower end of the discharging pipe is communicated with the feeding hole of the three-roller grinding machine, the crushing rollers are arranged side by side and are rotatably arranged in the crushing cavity, the crushing driving motor is arranged on the outer side surface of the side wall of the crushing chamber and are in driving connection with the crushing rollers, the crushing driving motor is used for driving the crushing rollers to rotate so as to perform crushing pretreatment on the chemical raw materials entering the crushing chamber through the feeding hole, the raw material screening device is arranged on the upper side surface of a workbench and is arranged below the hopper-shaped hopper which is arranged on the lower side of the three-roller grinding machine, and the hopper is provided with a hopper-shaped hopper which is arranged below the discharging hole.

2. The three-roll mill according to claim 1, wherein the raw material pretreatment device further comprises: the mounting seat is arranged on the outer side face of the side wall of the crushing chamber, the number of the crushing rollers and the number of the crushing driving motors are two, the two crushing rollers are axially penetrated and fixed with rotating shafts, two end parts of the rotating shafts are rotatably arranged on two opposite side walls of the crushing chamber through bearings, one end part of each rotating shaft penetrates out of the side wall, the two crushing driving motors are arranged on the mounting seat, the driving ends of the two crushing driving motors are respectively connected with the end parts of the side wall penetrated out of the rotating shafts, and the two crushing rollers are driven by the two crushing driving motors so that the two crushing rollers are driven by the two rotating shafts to rotate oppositely.

3. The three-roll mill according to claim 1, wherein the raw material pretreatment device further comprises: and one edge of the flip cover is hinged to one edge of the feed inlet, so that the flip cover can be opened or sealed at the feed inlet by taking the hinged part as an axis.

4. The three-roll grinder according to claim 1, wherein the bottom of the crushing cavity is concave downward, the discharge port is located at the lowest position of the bottom of the crushing cavity, the lower end of the discharge pipe is provided with a flaring portion in an inverted funnel shape, and the flaring portion is accommodated in the feed port of the three-roll grinder.

5. The three-roll grinder according to claim 1, wherein the raw material screening device is mainly composed of two guide plates, a screening frame, screening discs and a reciprocating device, the guide plates are rectangular plates, the two guide plates are oppositely and parallelly fixedly combined to the upper side of the workbench and are positioned at two sides of the feed opening, sliding grooves are correspondingly formed in the opposite plates of the two guide plates, the screening frame is a rectangular frame and is provided with a through opening in the middle, the lower part of the through opening forms the screening outlet, sliding parts are correspondingly arranged at the outer side of the frame plates at two sides of the screening frame, the screening frame is correspondingly embedded in the sliding grooves of the two guide plates so that the screening frame can horizontally slide between the two guide plates, the screening disc is composed of a disc frame in a rectangular frame shape and arranged in the disc frame, the disc frame is detachably arranged in the through opening of the screening frame, and the reciprocating device is arranged at the two sides of the workbench and drives the two guide plates to horizontally move, and the reciprocating device is arranged at the side of the workbench.

6. The three-roll grinder according to claim 5, wherein the reciprocating means is composed of a ㄩ -shaped frame, a pair of ball nuts, a reciprocating drive motor and a reciprocating screw rod, wherein the ends of two side plates of the ㄩ -shaped frame are fixedly combined with the outer side surfaces of the adjacent frame plates of the screening frame, the pair of ball nuts are fixedly arranged on the cross plates of the ㄩ -shaped frame in a penetrating manner, the reciprocating drive motor is arranged on the upper side surface of the workbench, and the reciprocating screw rod is screwed in the pair of ball nuts and one end of the reciprocating screw rod is connected with the driving end of the reciprocating drive motor.

7. The three-roll mill of claim 6 further comprising: the central control device is arranged on the upper side surface of the workbench and is electrically connected with the three-roller grinding machine, the reciprocating driving motor and the crushing driving motor respectively.

8. The three-roll mill of claim 5 wherein the raw material screening device further comprises: the screening frame is far away from a plurality of screw holes are uniformly formed in the frame plate of the reciprocating device, the screening frame is close to the inner side face of the frame plate of the reciprocating device to fix the fixing pad, the fastening rods are formed by threaded rods and screwing parts fixed at one end of the threaded rods, the threaded rods of the fastening rods are screwed in the screw holes, and the disc frame is abutted and fastened between the fixing pad and the other end of the threaded rods in the through holes of the screening frame by screwing the screwing parts.

9. The three-roll grinder according to claim 1, wherein a plurality of supporting feet are uniformly provided at the periphery of the lower side surface of the table.