Boron carbide crushing device

Abstract

The invention relates to the technical field of boron carbide processing, and discloses a boron carbide crushing device which comprises a shell, and a crushing mechanism, a grinding mechanism and a screening mechanism are sequentially arranged in the shell from top to bottom; the crushing mechanism preliminarily crushes boron carbide through cooperation of a crushing shaft, a crushing cone, movable teeth and static teeth, and a feeding hopper assists in uniform feeding. A splitter plate in front of the grinding mechanism buffers and uniformly splits the materials, and then the materials are finely ground by a grinding roller; a first screen and a second screen are arranged on an inclined grading screen plate in the screening mechanism and matched with a vibration assembly to enhance the screening efficiency and precision, and a partition plate and a partition net assist grading to achieve respective collection of materials with different particle sizes. According to the device, integrated continuous treatment of boron carbide from coarse crushing to fine grading is achieved, the crushing efficiency and the grading precision are improved, all the mechanisms cooperate to guarantee smooth flowing of materials, and the differentiated requirements of subsequent different procedures for the particle size of boron carbide can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crushing, in particular to a boron carbide crushing device. BACKGROUND

[0002] Boron carbide is widely used in abrasive materials, ceramics, nuclear industry and many other fields due to its high hardness, high wear resistance, good chemical stability and other excellent properties. In actual production, there are significant differences in the particle size requirements of boron carbide for different application scenarios. For example, as a fine abrasive, small particle size and uniformly distributed boron carbide particles are required, while for the preparation of some ceramic matrix composites, particles of a specific particle size range may be required to adapt to subsequent forming processes, etc. Therefore, it is crucial to accurately crush and classify boron carbide to obtain different particle size products.

[0003] In the prior art, the boron carbide crushing device often has the following deficiencies: first, the coordination of the crushing, grinding and screening mechanisms is poor, making it difficult to achieve integrated and continuous processing from coarse crushing to fine classification, resulting in the need for material transfer and processing by multiple devices, which not only reduces production efficiency, but also easily causes material loss; second, most screening mechanisms do not have efficient vibration auxiliary structures, and the screening efficiency of the material on the screen is low, making it difficult for small particle size materials to quickly pass through the screen to complete classification, which not only prolongs the processing cycle, but also leads to insufficient classification accuracy, making it impossible to accurately obtain boron carbide particle sizes suitable for subsequent different processes, limiting the application effect of boron carbide in various fields. The generation of these defects is mainly due to the lack of rationality in the layout of the device's functional mechanisms, the imperfect design of material transmission and processing, and the absence of screening power auxiliary structures. SUMMARY

[0004] To solve the above technical problems, the present application specifically adopts the following technical solutions.

[0005] A boron carbide crushing device is designed, which includes a housing, a crushing mechanism, a grinding mechanism and a screening mechanism arranged in the housing from top to bottom. The crushing mechanism includes a crushing shaft rotatingly arranged at the top of the housing, a crushing cone arranged on the crushing shaft, movable teeth arranged on the outer periphery of the crushing cone, and stationary teeth arranged on the inner wall of the housing and cooperating with the movable teeth. A crushing motor is coaxially connected to the crushing shaft at the top of the housing, and a feed hopper is arranged on both sides of the crushing motor at the top of the housing.

[0006] The screening mechanism includes a classification sieve plate obliquely arranged in the housing, and the classification sieve plate is provided with a first screen and a second screen from high to low, and the first screen and the second screen are connected by a partition strip. An inclined flow guide plate is arranged below the classification sieve plate, a partition plate extending to the bottom end of the housing is connected to the bottom of the partition strip, and a partition net is arranged on the partition plate between the flow guide plate and the classification sieve plate. The mesh diameter of the partition net is the same as that of the second screen.

[0007] Preferably, the baffle divides the space between the guide plate and the grading sieve plate into collection bin one and collection bin two, and sealing doors are arranged at the collection bin one and collection bin two and the sieve net two.

[0008] Preferably, a connecting rod is arranged below the crushing cone, and the lower end of the crushing shaft is rotationally connected with the connecting rod.

[0009] Preferably, shunt plates are hingedly arranged on the inner walls of the two sides of the shell between the crushing mechanism and the grinding mechanism, support plates are respectively arranged below each shunt plate, and compression springs are connected between the support plates and the shunt plates.

[0010] Preferably, the grinding mechanism comprises two grinding rollers rotationally arranged on the front and rear side walls of the shell, and the discharge opening between the two shunt plates is located directly above the two grinding rollers.

[0011] Preferably, cleaning mechanisms are respectively arranged on the outer sides of the two grinding rollers, each cleaning mechanism comprises a threaded rod rotationally arranged on the front and rear inner walls of the shell, a guide rod arranged in parallel with the threaded rod, a moving block threadedly fitted with the threaded rod and sleeved on the guide rod, and a cleaning brush connected to the moving block and in contact with the grinding roller, and a cleaning motor is arranged on the outer wall of the shell to drive the threaded rod to rotate.

[0012] Preferably, a buffer assembly is arranged between the cleaning brush and the moving block, and the buffer assembly comprises a sleeve and, in sequence, a buffer spring, a limiting plate and a telescopic rod sleeved in the sleeve, the limiting plate is slidably connected with the sleeve, and the telescopic rod extends into the sleeve at one end and is connected with the cleaning brush.

[0013] Preferably, a limiting assembly is arranged on the grading sieve plate, and the limiting assembly comprises a sliding groove arranged in the two side inner walls of the shell, a support guide rod arranged in the sliding groove, and two sliding blocks slidably sleeved on the support guide rod and connected with the grading sieve plate respectively after extending out of the sliding groove.

[0014] Preferably, a telescopic spring is arranged on the support guide rod between the sliding block and the inner wall of the sliding groove, and a vibration assembly is arranged on the grading sieve plate, and the vibration assembly comprises a movable rod connected to one side of the grading sieve plate, one end of the movable rod extends out of the shell and is connected with a wedge-shaped block one, a turntable is rotationally arranged on the outer wall of the shell at the same side of the movable rod, and a plurality of wedge-shaped block twos are arrayed on the outer circumferential surface of the turntable and in contact with the inclined surface of the wedge-shaped block one, the two turntables are drivingly connected through a transmission assembly, and a vibration motor is connected to the shaft of one of the turntables.

[0015] Preferably, a groove is arranged at the bottom of the partition strip, a clamping block is arranged at the top of the partition net, the top of the clamping block extends into the groove, and a rolling ball is embedded on the top of the clamping block and in contact with the top wall of the groove.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This device integrates crushing, grinding, and screening mechanisms, achieving continuous processing of boron carbide from coarse crushing to fine grading, eliminating the need for multiple equipment transfers and greatly improving production efficiency. Through the rational layout and coordinated operation of each mechanism, boron carbide products of different particle sizes can be accurately obtained, better adapting to the specific requirements of subsequent abrasive preparation, ceramic molding, and other processes for boron carbide particle size, and meeting the stringent requirements of different scenarios for boron carbide particle size.

[0018] 2. A flow divider plate, in conjunction with a compression spring, is installed between the crushing and grinding mechanisms. This plate not only buffers the impact force of the crushed material but also achieves uniform material distribution through its hinged oscillation, ensuring that the material enters the grinding mechanism evenly. This uniform distribution method avoids excessive local load on the grinding mechanism, guaranteeing the sufficiency and uniformity of the grinding process and providing a good material foundation for subsequent precise screening.

[0019] 3. The screening mechanism is equipped with a vibration component. Through the cooperation of a turntable, wedge blocks, and other structures, the grading screen plate generates reciprocating vibration. Simultaneously, return springs and extension springs assist in making the vibration more stable and the vibration force sufficient, greatly enhancing the screening effect and improving screening efficiency. This allows small-diameter materials to pass through the screen quickly, improving grading accuracy and ensuring that boron carbide of different particle sizes can be accurately graded.

[0020] 4. The cleaning mechanism on the outside of the grinding roller, driven by a threaded rod and a moving block, moves the cleaning brush to promptly remove residual material from the surface of the grinding roller, preventing material accumulation that could affect the grinding effect and equipment lifespan. Furthermore, the buffer assembly between the cleaning brush and the moving block prevents hard contact, protecting both the cleaning brush and the grinding roller and reducing maintenance costs. The screen uses a snap-fit ​​mechanism with grooves, and the snap-fit ​​block has ball bearings on top, reducing friction and facilitating the installation and removal of the screen, thus improving the maintainability of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation structure of the grading screen plate and the vibration mechanism;

[0023] Figure 3 yes Figure 1 Enlarged structural diagram at point A in the diagram;

[0024] Figure 4 yes Figure 2 Enlarged structural diagram at point B in the diagram;

[0025] The components in the diagram are labeled as follows: 1. Feed hopper; 2. Feeding mechanism; 3. Stationary tooth; 4. Crushing cone; 5. Moving tooth; 6. Crushing shaft; 7. Vibration assembly; 701. Movable rod; 702. Wedge block one; 703. Wedge block two; 704. Turntable; 8. Limiting assembly; 801. Slider; 802. Support guide rod; 803. Slide groove; 804. Telescopic spring; 9. Cleaning mechanism; 901. Moving block; 902. Guide rod; 903. Threaded rod; 904. Buffer assembly; 905. Cleaning brush; 10. Support plate; 11. Compression spring; 12. Screen one; 13. Guide plate; 14. Housing; 15. Collection bin one; 16. Partition plate; 17. Partition mesh; 18. Screen two; 19. Diverter plate; 20. Grinding roller; 21. Crushing motor; 22. Collection bin two; 23. Connecting rod; 24. Return spring; 25. Snap-fit ​​block; 26. Spacer bar; 27. Groove; 28. Ball bearing. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Example 1

[0028] A boron carbide pulverizing device, such as Figures 1 to 4 As shown, the device includes a housing 14. Inside the housing 14, from top to bottom, are arranged a crushing mechanism, a grinding mechanism, and a screening mechanism. The crushing mechanism includes a crushing shaft 6 rotatably mounted on the top of the housing 14, a crushing cone 4 mounted on the crushing shaft 6, moving teeth 5 on the outer surface of the crushing cone 4, and stationary teeth 3 on the inner wall of the housing 14 that mesh with the moving teeth 5. A crushing motor 21, coaxially connected to the crushing shaft 6, is located at the top of the housing 14. A connecting rod 23 is located below the crushing cone 4, and the lower part of the crushing shaft 6 is rotatably connected to the connecting rod 23. The connection between the crushing shaft 6 and the connecting rod 23 allows for relative rotation between the crushing shaft 6 and the crushing cone 4, ensuring stable operation of the crushing mechanism.

[0029] Feed hoppers 1 are provided on the top of the housing 14 on both sides of the crushing motor 21. A feeding mechanism 2 is provided below the feed hopper 1. The feeding mechanism 2 includes a feeding wheel and a feeding blade on the feeding wheel.

[0030] The screening mechanism includes a grading screen plate inclinedly disposed within the housing 14. The grading screen plate has a first screen 12 and a second screen 18 arranged from high to low. The first screen 12 and the second screen 18 are connected by a spacer 26. An inclined guide plate 13 is provided below the grading screen plate. A partition plate 16 extending to the bottom of the housing 14 is connected to the bottom of the spacer 26. A partition mesh 17 is provided on the partition plate 16 at a position between the guide plate 13 and the grading screen plate. The mesh diameter of the partition mesh 17 is the same as that of the second screen 18, and the mesh diameter of the second screen 18 is smaller than that of the first screen 12.

[0031] The crushing motor 21 is turned on, and the boron carbide raw material is fed into the feed inlet and initially crushed by the crushing mechanism. The crushed material falls to the grinding mechanism and is ground into finer particles by the grinding rollers 20. The fined material enters the screening mechanism and is classified and screened on the grading screens 12 and 18. Materials of different particle sizes are finally collected in the corresponding areas of the collection bins 15 and 22, respectively. Through the integrated design of crushing, grinding, and screening, continuous processing of boron carbide from coarse crushing to fine grading is achieved, improving crushing efficiency and grading accuracy; the reasonable layout of each mechanism ensures smooth material flow and improves the overall processing effect.

[0032] The partition 16 divides the space between the guide plate 13 and the grading screen plate into collection chamber one 15 and collection chamber two 22. Sealing doors are provided at collection chamber one 15, collection chamber two 22, and screen two 18. After the screened material enters these two collection chambers, the corresponding sealing doors can be opened to remove the collected boron carbide particles of different sizes.

[0033] A flow divider plate 19 is hinged to the inner walls of both sides of the housing 14 between the crushing mechanism and the grinding mechanism. A support plate 10 is provided below each flow divider plate 19, and a compression spring 11 is connected between the support plate 10 and the flow divider plate 19. The crushed material falls onto the flow divider plate 19, and the compression spring 11 buffers the impact of the material. The flow divider plate 19 swings to guide the material evenly to the grinding mechanism below, making the material distribution more uniform and facilitating the grinding mechanism to grind the material evenly and thoroughly.

[0034] The grinding mechanism includes two grinding rollers 20 rotatably mounted on the front and rear side walls of the housing 14, with the discharge port between the two diverter plates 19 located directly above the two grinding rollers 20. The corresponding position design of the discharge port and the grinding rollers 20 ensures that the material can accurately fall into the working area of ​​the grinding rollers 20, guaranteeing the effectiveness and uniformity of grinding and improving the grinding effect.

[0035] A cleaning mechanism 9 is provided on the outer side of each grinding roller 20. The cleaning mechanism 9 includes a threaded rod 903 rotatably mounted on the inner front and rear walls of the housing 14, a guide rod 902 parallel to the threaded rod 903, a movable block 901 sleeved on the guide rod 902 and threadedly engaged with the threaded rod 903, and a cleaning brush 905 connected to the movable block 901. The cleaning brush 905 contacts the grinding roller 20. A cleaning motor that drives the threaded rod 903 to rotate is provided on the outer wall of the housing 14. The cleaning motor drives the threaded rod 903 to rotate. Since the movable block 901 is threadedly engaged with the threaded rod 903 and sleeved on the guide rod 902, the rotation of the threaded rod 903 drives the movable block 901 to move along the guide rod 902, thereby causing the cleaning brush 905 connected to the movable block 901 to move. The cleaning brush 905 contacts the grinding roller 20 and can clean away the material remaining on the surface of the grinding roller 20. It can promptly clean residual materials on the surface of the grinding roller 20, preventing materials from accumulating on the grinding roller 20 and affecting the grinding effect. At the same time, it avoids material residue from causing wear to the grinding roller 20, ensuring the normal operation and service life of the grinding roller 20.

[0036] A buffer assembly 904 is provided between the sweeping brush 905 and the moving block 901. The buffer assembly 904 includes a sleeve and a buffer spring, a limiting plate, and a telescopic rod sequentially fitted inside the sleeve. The limiting plate is slidably connected to the sleeve, and one end of the telescopic rod extends into the sleeve and is connected to the sweeping brush 905. The presence of the buffer assembly 904 provides the sweeping brush 905 with buffering capability during the sweeping process, protecting the sweeping brush 905 and the grinding roller 20, and improving the reliability and service life of the sweeping mechanism 9.

[0037] A limiting component 8 is provided on the grading screen plate. The limiting component 8 includes a sliding groove 803 formed on the inner walls of both sides of the housing 14, a supporting guide rod 802 disposed in the sliding groove 803, and two sliders 801 slidably sleeved on the supporting guide rod 802. The two sliders 801 extend out of the sliding groove 803 and are respectively connected to the grading screen plate. The sliders 801 on both sides of the grading screen plate are slidably sleeved on the supporting guide rod 802. The supporting guide rod 802 provides support and guidance for the sliders 801 and the grading screen plate, so that the grading screen plate can slide stably along the supporting guide rod 802 under vibration and other conditions, ensuring the stable operation of the screening work.

[0038] A telescopic spring 804 is provided on the support guide rod 802 between the inner wall of the slider 801 and the groove 803, and a vibration assembly 7 is provided on the grading screen plate. The vibration assembly 7 includes a movable rod 701 connected to one side of the grading screen plate. One end of the movable rod 701 extends out of the housing 14 and is connected to a wedge block 702. A turntable 704 is rotatably provided on the outer wall of the housing 14 on the same side as the movable rod 701. Multiple wedge blocks 703 that are in contact with the inclined surface of the wedge block 702 are arranged in an array on the outer circumferential surface of the turntable 704. The two turntables 704 are connected by a transmission assembly, and a vibration motor is connected to the shaft of one of the turntables 704. Multiple return springs 24 are connected between the other side of the grading screen plate and the inner wall of the housing 14. The transmission assembly drives two turntables 704 to rotate. The second wedge block 703 on the outer periphery of the turntable 704 rotates and engages with the inclined surface of the first wedge block 702 on the movable rod 701, pushing the first wedge block 702 and the movable rod 701 to move, thereby moving the grading screen plate. Simultaneously, under the action of the return spring 24, the grading screen plate moves in the opposite direction. This repeated motion causes the grading screen plate to vibrate. The telescopic spring 804 on the support guide rod 802 also assists in the vibration of the grading screen plate, enhancing the vibration effect and making screening more efficient. The vibration assembly 7 causes the grading screen plate to vibrate, enhancing the screening effect, improving screening efficiency, and making it easier for materials to pass through the screen, thus improving grading accuracy. The cooperation between the return spring 24 and the telescopic spring 804 makes the vibration more stable and provides sufficient vibration force.

[0039] A groove 27 is provided at the bottom of the partition bar 26, and a snap-fit ​​block 25 is provided at the top of the partition screen 17. The top of the snap-fit ​​block 25 extends into the groove 27, and a ball bearing 28 is rolled and embedded in the top of the snap-fit ​​block 25, which contacts the top wall of the groove 27. The rolling of the ball bearing 28 can reduce the friction between the snap-fit ​​block 25 and the top wall of the groove 27 when the grading screen plate shakes.

[0040] The working principle of this invention is as follows: The crushing motor 21 and the vibration motor are turned on. The crushing motor 21 drives the crushing shaft 6 to rotate, causing the crushing cone 4 to rotate synchronously. The vibration motor drives the turntable 704 to rotate through the transmission assembly, providing power for the vibration of the grading screen plate. Boron carbide raw material is slowly fed into the feed inlets on both sides of the top of the shell 14. After entering the crushing mechanism, the raw material is initially crushed into smaller particles by the mutual shearing and collision between the moving teeth 5 on the outer periphery of the rotating crushing cone 4 and the stationary teeth 3 on the inner wall of the shell 14. The initially crushed material falls onto the diversion plate 19. At this time, the compression spring 11 below the diversion plate 19 buffers the impact force of the material. Simultaneously, the diversion plate 19 swings moderately due to its hinged design, guiding the material evenly to the feed inlet directly above the two grinding rollers 20. After the material falls between the two grinding rollers 20, the grinding rollers 20 rotate relative to each other, squeezing and grinding the material to further refine the particles. The ground material enters the screening mechanism and falls onto the inclined grading screen plate. At this time, the vibration component 7 works in coordination. The wedge block 703 on the outer periphery of the turntable 704 is in contact with the inclined surface of the wedge block 702 on the movable rod 701, pushing the movable rod 701 to move the grading screen plate. With the assistance of the reverse pulling force of the return spring 24 and the extension spring 804 on the support guide rod 802, the grading screen plate vibrates back and forth, enhancing the screening effect. The screens 12 and 18 on the grading screen plate classify the material. The material with a particle size that matches the screen 12 passes through the screen 12 and is guided by the guide plate 13 into the collection bin 15. The material with a particle size that matches the screen 18 passes through the screen 18 and enters the collection bin 22. The material in the collection bin 15 is screened again by the partition screen 17 and then enters the collection bin 22 to ensure the grading accuracy. If material remains on the surface of the grinding roller 20, start the cleaning motor. The cleaning motor drives the threaded rod 903 to rotate, which in turn moves the moving block 901 sleeved on the guide rod 902. This causes the cleaning brush 905 to be buffered by the buffer assembly 904 and then contact the grinding roller 20 to clean the residual material and prevent accumulation from affecting the grinding effect. After screening, turn off all motors and open the sealing doors (not shown in the figure) at collection bin 15, collection bin 22, and screen 2 18 to collect boron carbide materials of different particle sizes.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A boron carbide pulverizing device, characterized in that, The device includes a housing, and inside the housing, from top to bottom, are arranged a crushing mechanism, a grinding mechanism, and a screening mechanism. The crushing mechanism includes a crushing shaft rotatably mounted on the top of the housing, a crushing cone mounted on the crushing shaft, moving teeth mounted on the outer surface of the crushing cone, and stationary teeth mounted on the inner wall of the housing that cooperate with the moving teeth. A crushing motor coaxially connected to the crushing shaft is mounted on the top of the housing, and feed hoppers are respectively located on both sides of the crushing motor at the top of the housing. The screening mechanism includes a grading screen plate inclinedly disposed within the housing. The grading screen plate has two screens, Screen 1 and Screen 2, arranged from high to low. Screen 1 and Screen 2 are connected by a partition. An inclined guide plate is disposed below the grading screen plate. A partition plate extending to the bottom of the housing is connected to the bottom of the partition. A mesh is disposed on the partition plate at a position between the guide plate and the grading screen plate. The mesh diameter of the mesh is the same as that of Screen 2.

2. The boron carbide pulverizing device as described in claim 1, characterized in that: The partition divides the space between the guide plate and the grading screen into collection chamber one and collection chamber two, and a sealing door is provided at collection chamber one, collection chamber two, and screen two.

3. The boron carbide pulverizing device as described in claim 1, characterized in that: A connecting rod is provided below the crushing cone, and the lower part of the crushing shaft is rotatably connected to the connecting rod.

4. The boron carbide pulverizing device as described in claim 1, characterized in that: A flow divider plate is hinged to the inner walls on both sides of the housing between the crushing mechanism and the grinding mechanism. A support plate is provided below each flow divider plate, and a compression spring is connected between the support plate and the flow divider plate.

5. The boron carbide pulverizing device as described in claim 1, characterized in that: The grinding mechanism includes two grinding rollers that are rotatably mounted on the front and rear side walls of the housing, and the discharge port between the two flow dividers is located directly above the two grinding rollers.

6. The boron carbide pulverizing device as described in claim 1, characterized in that: A cleaning mechanism is provided on the outer side of each grinding roller. The cleaning mechanism includes a threaded rod rotatably mounted on the inner wall of the front and rear of the housing, a guide rod arranged parallel to the threaded rod, a movable block sleeved on the guide rod and threadedly engaged with the threaded rod, and a cleaning brush connected to the movable block. The cleaning brush is in contact with the grinding roller. A cleaning motor that drives the threaded rod to rotate is provided on the outer wall of the housing.

7. The boron carbide pulverizing device as described in claim 1, characterized in that: A buffer assembly is provided between the cleaning brush and the moving block. The buffer assembly includes a sleeve and a buffer spring, a limiting plate, and a telescopic rod that are sequentially fitted inside the sleeve. The limiting plate is slidably connected to the sleeve, and the telescopic rod has one end extending into the sleeve and connected to the cleaning brush.

8. The boron carbide pulverizing device as described in claim 1, characterized in that: The grading screen plate is provided with a limiting component, which includes a sliding groove formed on the inner wall of both sides of the shell, a supporting guide rod provided in the sliding groove, and two sliders slidably sleeved on the supporting guide rod, and the two sliders extend out of the sliding groove and are respectively connected to the grading screen plate.

9. The boron carbide pulverizing device as described in claim 1, characterized in that: A telescopic spring is provided on the support guide rod between the slider and the inner wall of the chute, and a vibration assembly is provided on the grading screen plate. The vibration assembly includes a movable rod connected to one side of the grading screen plate. One end of the movable rod extends out of the housing and is connected to a wedge block. A turntable is rotatably provided on the outer wall of the housing on the same side as the movable rod. Multiple wedge blocks are arranged in an array on the outer circumferential surface of the turntable, which are in contact with the inclined surface of the wedge block. The two turntables are connected by a transmission assembly, and a vibration motor is connected to the shaft of one of the turntables. Multiple return springs are connected between the other side of the grading screen plate and the inner wall of the housing.

10. The boron carbide pulverizing device as described in claim 9, characterized in that: A groove is provided at the bottom of the partition bar, and a snap-fit ​​block is provided at the top of the partition mesh. The top of the snap-fit ​​block extends into the groove, and a ball bearing is rolled and embedded on the top of the snap-fit ​​block, which contacts the top wall of the groove.

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