Granularity-adjustable flour mill

Abstract

The utility model discloses a granularity-adjustable flour mill which comprises a crushing box, a pair of crushing rollers, a driving part and a sieve plate, a feeding hole is formed in the top of the crushing box, and a first recycling groove is formed in the inner bottom; the pair of crushing rollers is rotationally arranged in the crushing box and is positioned below the feeding hole; rotating shafts arranged at the two ends of the crushing box are connected to a motor and a shaft sleeve respectively; the driving parts are arranged on the side walls of the two sides of the crushing box, the motor and the shaft sleeve are arranged on the driving parts correspondingly, and the driving parts are used for driving the pair of crushing rollers to be close to or away from each other; the sieve plate is arranged in the crushing box and located below the crushing roller and above the first recovery tank. The problems that the granularity of fixed powder making equipment cannot be adjusted, and powder making equipment with multiple sets of built-in crushing rollers is complex in structure, machining is affected by roller set switching, the adjusting range is limited, the size is large, and the application scene is limited are solved.

Description

Technical Field

[0001] This utility model relates to the field of powder making equipment technology, and more specifically, to a powder making machine with adjustable particle size. Background Technology

[0002] Traditional powder milling equipment has a fixed gap between the crushing rollers, resulting in an unadjustable finished product particle size. This makes it difficult to adapt to different process requirements. When different particle sizes are needed, multiple different powder mills need to be replaced, which is very cumbersome. Some powder milling equipment with adjustable particle size uses multiple sets of different crushing rollers for adjustment, which increases the complexity of the structure and maintenance costs. Switching between different roller sets usually requires stopping the machine, affecting processing efficiency. The particle size adjustment range of multiple roller sets is limited, and the layout of multiple roller sets requires more space for installation and maintenance, resulting in a larger equipment size and limited applicable scenarios. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable particle size mill, which solves the problems of fixed milling equipment having non-adjustable particle size, and milling equipment with multiple built-in crushing rollers having a complex structure, affecting processing when switching roller groups, having a limited adjustment range, large size, and limited applicable scenarios.

[0004] The embodiments of this utility model are achieved through the following technical solutions:

[0005] An adjustable particle size mill, comprising:

[0006] The crushing box has a feed inlet at the top and a first recycling tank at the bottom inside.

[0007] A pair of crushing rollers are rotatably disposed inside the crushing box and located below the feed inlet; the rotating shafts at both ends of the crushing box are respectively connected to the motor and the bushing.

[0008] The drive unit is located on both sides of the crushing box. The motor and the bushing are respectively located on the drive unit. The drive unit is used to drive a pair of crushing rollers to move closer or further away.

[0009] A screen plate is disposed inside the crushing box and located below the crushing roller and above the first recycling tank.

[0010] The crushing box has working windows on both sides of its side walls; the drive unit is located on the outer side wall of the crushing box, next to the working windows; the shafts at both ends of the crushing roller pass through the working windows on both side walls respectively.

[0011] The inner edge of the working window is provided with several dustproof brushes; when the rotating shaft passes through the working window, the dustproof brushes cover the rotating shaft.

[0012] The drive unit includes a mounting base, a screw, a guide rod, and a movable base; the mounting base is located on the outer wall of the crushing chamber and on both sides of the working window; the two ends of the screw are rotatably mounted on the mounting bases on both sides; the guide rod is parallel to the screw, with its two ends mounted on the mounting bases on both sides; the movable base is provided with a screw hole and a guide hole, and the screw and guide rod respectively cooperate to pass through the screw hole and the guide hole.

[0013] Two mounting seats are respectively provided on the screws on both sides of the crushing box; the motors at one end of the two crushing rollers are respectively provided on the two mounting seats on one side of the screw; the bushings at the other end of the two crushing rollers are respectively provided on the two mounting seats on the other side of the screw.

[0014] Four sliding baffles are attached to the two pairs of side walls inside the crushing box and are slidably positioned at the corresponding working windows. A sliding groove is provided on one side of the working window along the screw axis. A sliding strip is provided on one side of the sliding baffle and is slidably positioned in the sliding groove. A rotating shaft hole is provided on the sliding baffle and the rotating shaft passes through the rotating shaft hole.

[0015] It also includes a rotating box, located on one side of the crushing box; the side wall at the connection between the rotating box and the crushing box is provided with a first side opening and a second side opening, respectively communicating with the interior of the rotating box and the crushing box; the rotating box is provided with a rotating mechanism, including a pulley, a secondary pulley, a conveyor belt and several rotating buckets; the pulley is driven by a pulley motor and is rotatably mounted on the inner side wall of the rotating box; the secondary pulley is rotatably mounted on the inner side wall of the rotating box and is vertically corresponding to the pulley; the conveyor belt is wound around the pulley and the secondary pulley respectively, and is driven by the pulley to move the conveyor belt around the pulley and the secondary pulley; several rotating buckets are arranged at equal intervals and hinged on the surface of the conveyor belt; a torsion spring is provided at the hinge of the rotating bucket and the conveyor belt to restore the surface of the rotating bucket opening to be perpendicular to the conveyor belt.

[0016] The screen plate is inclined downward toward the operating box; the first side opening is located above the lower end of the screen plate, and its bottom side is flush with the surface of the screen plate; the second side opening is located above the crushing roller, and a third guide plate is inclined downward toward the gap between the two crushing rollers; a rotating seat is also provided at the lower edge of the first side opening and the second side opening respectively.

[0017] The inner wall of the operating box is provided with a first rotating plate and a second rotating plate, which are respectively rotatably mounted on rotating seats at the lower edges of the first side opening and the second side opening; a first baffle is provided on one side of the rotating seat at the first side opening, which is attached to the bottom side of the first rotating plate, and the upper surface of the first rotating plate is flush with the sieve plate.

[0018] A second baffle is provided below the rotating part of the second rotating plate and is attached to the bottom side of the rotating seat at the second side opening. The upper surface of the second rotating plate is flush with the third guide plate. A stop is provided above the second rotating plate. When the rotating bucket moves to the stop with the conveyor belt, the top of the rotating bucket is blocked by the stop, causing the rotating bucket to rotate.

[0019] The first rotating plate is provided with a torsion spring at its rotating part to reset the first rotating plate to fit with the first baffle; the second rotating plate is provided with a torsion spring at its rotating part to reset the second rotating plate so that the second baffle fits with the bottom side of the rotating seat at the second side opening.

[0020] The crushing box is also provided with inclined guide grooves on two pairs of side walls; the crushing box is also provided with through grooves on the side wall away from the operating box; the screen plate passes through the through grooves, and its two side edges are slidably disposed in the guide grooves on both sides.

[0021] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0022] 1. The present invention relates to an adjustable particle size powder mill, which moves two crushing rollers by a drive unit and adjusts the distance between the two crushing rollers, thereby precisely controlling the crushed particle size of the material. This avoids setting multiple sets of crushing rollers, which would make the equipment too bulky. Furthermore, the drive unit is driven by a threaded connection, which enables stepless adjustment of the particle size, expands the adjustment range, and improves practicality.

[0023] 2. In this utility model, an adjustable particle size powder mill is provided. In order to avoid the powder from damaging the motor and to allow the crushing roller to move relative to the motor, a working window is provided on the side wall of the crushing box. The motor of the crushing roller is placed outside the crushing box, so that the shaft of the crushing roller passes through the working window to work. In addition, in order to prevent the powder from escaping from the working window, a dustproof brush and a sliding baffle are provided at the working window for double protection to prevent dust from entering the transmission components and causing damage to the equipment.

[0024] 3. The adjustable particle size powder mill of this utility model also has a running box on one side of the crushing box, which is used to run the incompletely crushed particles in the crushing box to the crushing roller for further crushing, so as to realize the automatic circulation crushing of substandard materials, thereby improving the crushing effect and improving product quality. Attached Figure Description

[0025] Figure 1 This is an internal schematic diagram of the present invention;

[0026] Figure 2 It is attached Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 It is attached Figure 1 Enlarged view at point B in the middle;

[0028] Figure 4 This is a partial schematic diagram of the side wall of the crushing box on one side of the crushing roller;

[0029] Figure 5 It is attached Figure 4 Partial cross-sectional view of the outer side wall of the crushing chamber;

[0030] Figure 6 It is attached Figure 5 Enlarged view of point C in the middle.

[0031] In the picture:

[0032] 1- Crushing box, 101- Feed hopper, 102- Check box, 103- Check plate, 104- First guide plate, 105- Discharge port, 106- Baffle, 107- First recovery trough, 108- Second guide plate, 2- Rotating box, 201- First side opening, 202- First rotating plate, 203- First baffle, 204- Second side opening, 205- Third guide plate, 206- Second rotating plate, 207- Second baffle, 208- Second recovery trough, 3 - Crushing roller, 301- Rotating shaft, 302- Motor, 303- Working window, 304- Dustproof brush, 305- Mounting base, 306- Screw, 307- Guide rod, 308- Moving base, 309- Sliding baffle, 3091- Rotating shaft hole, 3092- Sliding strip, 310- Dustproof cover, 311- Slide groove, 4- Screen plate, 5- Conveyor belt, 601- Pulley, 602- Conveyor belt, 603- Mounting block, 604- Operating bucket, 605- Stop block. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] like Figure 1As shown, an adjustable particle size pulverizer includes a crushing chamber 1 and a running chamber 2. The crushing chamber 1 has a feed inlet at its top. A check box 102 is also provided at the top of the feed inlet, with openings at both the top and bottom for connecting the outside to the inside of the crushing chamber 1. A feed hopper 101 is provided at the top of the check box 102 for easy feeding of materials into the crushing chamber 1. A check plate 103 is horizontally positioned inside the check box 102, located between the top and bottom openings, with gaps on both sides and a convex top to facilitate material feeding. When the material is fed to the top of the check plate 103, it slides down the ramps on both sides of the top of the check plate 103 and falls through the gaps on both sides; the feed inlet below the check box 102 is provided with first guide plates 104 extending inward and downward on both sides to collect the fed material in one place; the operating box 2 is located on the right side of the crushing box 1 and is provided with an operating mechanism; the side wall at the connection between the operating box 2 and the crushing box 1 is provided with a first side opening 201 and a second side opening 204, which are respectively connected to the interior of the operating box 2 and the crushing box 1;

[0036] The crushing box 1 is equipped with a pair of crushing rollers 3, a screen plate 4, a conveyor belt 5, and a first recycling trough 107. The crushing rollers 3 are rotatably positioned below the feed inlet, allowing material collected by the first guide plate 104 to fall between the two crushing rollers 3 for crushing. The screen plate 4 is positioned below the crushing rollers 3 and is inclined downwards towards the operating box 2, allowing the powder crushed by the crushing rollers 3 to fall onto the screen plate 4 for sieving. The first side opening 201 is located above the lower end of the screen plate 4, with its bottom side flush with the surface of the screen plate 4, allowing larger particles to slide down the screen plate 4 and enter the operating box 2 through the first side opening 201. Guide grooves are also inclinedly provided on the front and rear side walls of the crushing box 1. A through groove is also provided on the side wall of the crushing box 1 away from the operating box 2. The screen plate 4 passes through the through groove, and its two side edges are slidably positioned within the guide grooves on both sides. Since the screen plate 4 is detachable... The required particle size of the powder can be further screened by replacing the screen plate 4 with different sizes; the conveyor belt 5 is horizontally positioned below the screen plate 4, and a discharge port 105 is provided on the side wall of the crushing box 1 on its left side; the left end of the conveyor belt 5 extends out of the crushing box 1 through the discharge port 105 for discharge; a second guide plate 108 is inclinedly provided above the right end of the conveyor belt 5, with the upper end of the second guide plate 108 located below the lower end of the screen plate 4 and the lower end of the second guide plate 108 located above the right end of the conveyor belt 5, to ensure that the powder screened by the screen plate 4 on the right side can slide along the second guide plate 108 onto the conveyor belt 5; and a cover 106 is also provided on the outside of the discharge port 105 to facilitate material collection and prevent powder from escaping; the first recovery tank 107 is located at the bottom inside the crushing box 1, below the conveyor belt 5, to collect the powder that the conveyor belt 5 does not collect, further improving the material recovery rate and reducing losses.

[0037] like Figure 1-3As shown, the operating mechanism inside the operating box 2 includes a pulley 601, a secondary pulley, a conveyor belt 602, and several operating buckets 604. The pulley 601 is driven by a pulley 601 motor 302 and is rotatably mounted on the inner wall of the operating box 2. The secondary pulley is rotatably mounted on the inner wall of the operating box 2 and is vertically corresponding to the pulley 601. The conveyor belt 602 is wound around the pulley 601 and the secondary pulley, and is driven by the pulley 601 to move around the pulley 601 and the secondary pulley. Several mounting blocks 603 are also equidistantly arranged on the surface of the conveyor belt 602. Several operating buckets 604 are hinged to the corresponding mounting blocks 603. A torsion spring is provided at the hinge point between the operating bucket 604 and the mounting block 603. When the operating bucket 604 rotates, the surface of the opening of the operating bucket 604 can be reset to be perpendicular to the conveyor belt 602.

[0038] The first side opening 201 is located above the lower end of the screen plate 4, and its bottom side is flush with the surface of the screen plate 4; the second side opening 204 is located above the crushing roller 3 and extends downward at an angle toward the gap between the two crushing rollers 3, and a third guide plate 205 is provided; a rotating seat is also provided at the lower edge of the first side opening 201 and the second side opening 204 respectively.

[0039] The inner side wall of the operating box 2 is provided with a first rotating plate 202 and a second rotating plate 206, which are respectively rotatably mounted on rotating seats at the lower edges of the first side opening 201 and the second side opening 204.

[0040] A first baffle 203 is provided on one side of the rotating seat at the first side opening 201 and is attached to the bottom side of the first rotating plate 202. The upper surface of the first rotating plate 202 is flush with the screen plate 4, so that larger particles of material slide down the screen plate 4 and the first rotating plate 202 into the rotating hopper 604. A torsion spring is provided at the rotating part of the first rotating plate 202. When the rotating hopper 604 moves upward with the conveyor belt 602 and the rotating hopper 604 contacts the first rotating plate 202, the first rotating plate 202 rotates. After the rotating hopper 604 passes, the torsion spring causes the first rotating plate 202 to return to its original position and be attached to the first baffle 203.

[0041] A second baffle 207 is provided below the rotating part of the second rotating plate 206 and is attached to the bottom side of the rotating seat at the second side opening 204. The upper surface of the second rotating plate 206 is flush with the third guide plate 205. A torsion spring is provided at the rotating part of the second rotating plate 206. When the rotating bucket 604 continues to move upward with the conveyor belt 602 and contacts the second rotating plate 206, the second rotating plate 206 rotates. After the rotating bucket 604 passes, the torsion spring causes the second baffle 207 to rotate. 7. The rotating seat at the second side opening 204 is repositioned and fits into place; a stop block 605 is provided above the second rotating plate 206. When the rotating bucket 604 moves to the stop block 605 with the conveyor belt 602, the top of the rotating bucket 604 is blocked by the stop block 605, causing the rotating bucket 604 to rotate and the material in the rotating bucket 604 to fall onto the second rotating plate 206, and slide down along the second rotating plate 206 and the third guide plate 205 in sequence, until it is crushed again at the gap between the two crushing rollers 3.

[0042] Specifically, the inner bottom of the operating box 2 is also provided with a second recovery tank 208, which is used to collect the powder that the operating bucket 604 did not catch, further improving the material recovery rate and reducing losses.

[0043] like Figure 4-6 As shown, a working window 303 is provided through both the front and rear side walls of the crushing box 1, corresponding to the two crushing rollers 3. Two working windows 303 are provided on each side wall. A driving part is provided on the outer side wall of the crushing box 1 below the working window 303, which is used to drive the two crushing rollers 3 to move closer or further away. The rotating shafts 301 at both ends of the crushing rollers 3 pass through the corresponding working windows 303 on the side walls and are connected to the motor 302 and the bushing. The motor 302 is used to drive the crushing rollers 3 to rotate, and the bushing is used to limit the position of the rotating shafts 301 and keep them rotating. Several dustproof brushes 304 are provided on the inner edge of the working window 303. When the rotating shaft 301 passes through the working window 303, the dustproof brushes 304 cover the rotating shaft 301 to prevent dust from escaping from the working window 303.

[0044] The drive units on both sides of the crushing chamber 1 are identical; each drive unit includes two mounting seats 305, a screw 306, two guide rods 307, and two movable seats 308; the two mounting seats 305 are respectively located on both sides of the two working windows 303 on the outer side wall of the crushing chamber 1; the two ends of the screw 306 are respectively rotatably mounted on the mounting seats 305 on both sides, and the thread directions below the two working windows 303 are opposite; the two guide rods 307 are arranged parallel to each other on both sides of the screw 306, and their two ends are located on the mounting seats on both sides. On 305; the movable seat 308 is provided with a screw hole and a guide hole, and the screw 306 and the guide rod 307 respectively cooperate to pass through the screw hole and the guide hole, and the two movable seats 308 are respectively located below the two working windows 303; the screw 306 rotates with the motor 302, thereby driving the movable seat 308 to move, and the oppositely arranged threads can make the movable seats 308 located below the two working windows 303 move closer or further apart; the two guide rods 307 are used to ensure the stability of the movement of the movable seat 308;

[0045] The motors 302 at one end of the two crushing rollers 3 are respectively mounted on two mounting seats 305 on one side of the screw 306, and the bushings at the other end are respectively mounted on two mounting seats 305 on the other side of the screw 306. The drive units on both sides work synchronously, so that the two ends of the crushing rollers 3 move synchronously, thereby adjusting the distance between the two crushing rollers 3.

[0046] Four sliding baffles 309 are attached to the two pairs of side walls inside the crushing box 1, and are slidably disposed at the corresponding working windows 303. Sliding grooves 311 are provided on the upper and lower side walls of the working windows 303 along the axis of the screw 306. Sliding strips 3092 are horizontally provided on the upper and lower edges of one side of the sliding baffles 309, and are slidably disposed in the sliding grooves 311. The sliding baffles 309 are provided with pivot holes 3091, and the pivot 301 passes through the pivot holes 3091. When the pivot 301 moves with the drive unit, it can drive the sliding baffles 309 to move along the sliding grooves 311. When the sliding baffles 309 move, they always cover the working windows 303, further preventing dust from escaping from the working windows 303.

[0047] Specifically, a dust cover 310 is provided above the slide groove 311 above the working window 303. It is tilted downward to cover the top of the sliding baffle 309, further preventing dust from escaping through the gap between the sliding baffle 309 and the inner wall of the crushing box 1.

[0048] The working principle of this embodiment is as follows:

[0049] This utility model discloses an adjustable particle size powder mill. Material is first fed into the feed hopper 101, slides down the ramps on both sides of the top of the check plate 103, and falls through the gaps on both sides to the first guide plate 104. The fed material is then collected and falls between two crushing rollers 3 for crushing. The powder crushed by the crushing rollers 3 falls onto the screen plate 4 for sieving. Because the motor 302 on the device vibrates during operation, the entire device vibrates, causing the screen plate 4 to vibrate as well. This prevents powder from accumulating on the screen plate 4. The sieved powder falls through the screen plate 4 onto the conveyor belt 5, and then... The material is moved to the discharge port 105 for collection; larger particles of material after screening slide down along the screen plate 4 and the first rotating plate 202 into the rotating bucket 604 in the rotating box 2; the rotating bucket 604 moves upward with the conveyor belt 602, and the material sliding down along the first rotating plate 202 can be continuously caught by multiple rotating buckets 604 that move in succession. The top of the rotating bucket 604 is blocked by the stop block 605, which causes the rotating bucket 604 to rotate and cause the material in the rotating bucket 604 to fall onto the second rotating plate 206, and slide down along the second rotating plate 206 and the third guide plate 205 in sequence, and is crushed again at the gap between the two crushing rollers 3.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A powder mill with adjustable particle size, characterized in that, include: The crushing box has a feed inlet at the top and a first recycling tank at the bottom inside. A pair of crushing rollers are rotatably disposed inside the crushing box and located below the feed inlet; the rotating shafts at both ends of the crushing box are respectively connected to the motor and the bushing. The drive unit is located on both sides of the crushing box. The motor and the bushing are respectively located on the drive unit. The drive unit is used to drive a pair of crushing rollers to move closer or further away. A screen plate is disposed inside the crushing box and located below the crushing roller and above the first recycling tank.

2. The adjustable particle size mill according to claim 1, characterized in that, The crushing box has working windows on both sides of its side walls; the drive unit is located on the outer side wall of the crushing box, next to the working windows; the shafts at both ends of the crushing roller pass through the working windows on both side walls respectively.

3. The adjustable particle size mill according to claim 2, characterized in that, The inner edge of the working window is provided with several dustproof brushes; when the rotating shaft passes through the working window, the dustproof brushes cover the rotating shaft.

4. The mill according to claim 2, wherein The drive unit includes a mounting base, a screw, a guide rod, and a movable base; the mounting base is located on the outer wall of the crushing chamber and on both sides of the working window; the two ends of the screw are rotatably mounted on the mounting bases on both sides; the guide rod is parallel to the screw, with its two ends mounted on the mounting bases on both sides; the movable base is provided with a screw hole and a guide hole, and the screw and guide rod respectively cooperate to pass through the screw hole and the guide hole.

5. A mill according to claim 4, wherein Two mounting seats are respectively provided on the screws on both sides of the crushing box; the motors at one end of the two crushing rollers are respectively provided on the two mounting seats on one side of the screw; the bushings at the other end of the two crushing rollers are respectively provided on the two mounting seats on the other side of the screw.

6. A mill according to claim 5, wherein, Four sliding baffles are attached to the two pairs of side walls inside the crushing box and are slidably positioned at the corresponding working windows. A sliding groove is provided on one side of the working window along the screw axis. A sliding strip is provided on one side of the sliding baffle and is slidably positioned in the sliding groove. A rotating shaft hole is provided on the sliding baffle and the rotating shaft passes through the rotating shaft hole.

7. A powder mill with adjustable particle size according to claim 1, characterized in that, It also includes a rotating box, which is located on one side of the crushing box; the side wall at the connection between the rotating box and the crushing box is provided with a first side opening and a second side opening, which are respectively connected to the interior of the rotating box and the crushing box. The operating box is equipped with an operating mechanism, including a pulley, a secondary pulley, a conveyor belt, and several operating buckets. The pulley is driven by a pulley motor and is rotatably mounted on the inner side wall of the operating box. The secondary pulley is rotatably mounted on the inner side wall of the operating box and is vertically corresponding to the pulley. The conveyor belt is wound around the pulley and the secondary pulley respectively, and is driven by the pulley to move around the pulley and the secondary pulley. Several operating buckets are arranged at equal intervals and are hinged to the surface of the conveyor belt. A torsion spring is provided at the hinge point between the operating bucket and the conveyor belt to restore the surface of the operating bucket opening to be perpendicular to the conveyor belt.

8. A mill according to claim 7, wherein The screen plate is inclined downward toward the operating box; the first side opening is located above the lower end of the screen plate, and its bottom side is flush with the surface of the screen plate; the second side opening is located above the crushing roller, and a third guide plate is inclined downward toward the gap between the two crushing rollers; a rotating seat is also provided at the lower edge of the first side opening and the second side opening respectively. The inner wall of the operating box is provided with a first rotating plate and a second rotating plate, which are respectively rotatably mounted on rotating seats at the lower edges of the first side opening and the second side opening; a first baffle is provided on one side of the rotating seat at the first side opening, which is attached to the bottom side of the first rotating plate, and the upper surface of the first rotating plate is flush with the sieve plate. A second baffle is provided below the rotating part of the second rotating plate and is attached to the bottom side of the rotating seat at the second side opening. The upper surface of the second rotating plate is flush with the third guide plate. A stop is provided above the second rotating plate. When the rotating bucket moves to the stop with the conveyor belt, the top of the rotating bucket is blocked by the stop, causing the rotating bucket to rotate.

9. A mill according to claim 8, wherein, The first rotating plate is provided with a torsion spring at its rotating part to reset the first rotating plate to fit with the first baffle; the second rotating plate is provided with a torsion spring at its rotating part to reset the second rotating plate so that the second baffle fits with the bottom side of the rotating seat at the second side opening.

10. A powder mill with adjustable particle size according to claim 8, characterized in that, The crushing box is also provided with inclined guide grooves on two pairs of side walls; the crushing box is also provided with through grooves on the side wall away from the operating box; the screen plate passes through the through grooves, and its two side edges are slidably disposed in the guide grooves on both sides.

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