Energy-saving boron carbide smelting crystal block crushing device and process

Abstract

The invention discloses an energy-saving boron carbide smelting crystal block crushing device and process, and the energy-saving boron carbide smelting crystal block crushing device comprises a support frame, a jaw crusher fixedly connected to the upper end of the support frame, a discharge hopper arranged on one side of the jaw crusher, and a back grinding body fixedly connected to the upper end of the discharge hopper, the back-grinding body is of a calabash-shaped structure, a cavity is formed in the wall body of the back-grinding body, two second groove bodies are formed in the middle of the inner wall of the cavity in a penetrating mode in the direction towards the center of the back-grinding body, two third groove bodies are formed in the inner wall of the back-grinding body in a penetrating mode, the third groove bodies communicate with the interior of the cavity, and guide plates are fixedly connected to the inner walls of the third groove bodies. The invention has the advantages of high integration level, controllable granularity, energy conservation, environmental protection and continuous operation.

Description

Technical Field

[0001] This invention relates to the field of superhard material processing and metallurgical engineering technology, specifically to an energy-saving boron carbide smelting crystal bulk crushing device and process. Background Technology

[0002] Boron carbide, as one of the hardest known man-made materials, has irreplaceable application value in fields such as armor protection, nuclear industry, wear-resistant parts and precision grinding. Its industrial production usually obtains bulk crystals through high-temperature smelting, while subsequent applications generally require the bulk crystals to be crushed and classified into particles or powders of specific particle size ranges. Therefore, efficient, energy-saving and particle size-controllable crushing and primary sorting processes are key front-end links to realize high-value-added applications of boron carbide.

[0003] Currently, the crushing of large boron carbide crystals mainly relies on the traditional multi-stage mechanical crushing and grinding method. A typical process uses a jaw crusher for primary crushing, followed by multi-stage refining using a series of roller crushers, ball mills, or vibratory mills. However, this method has the following inherent drawbacks: Wide particle size distribution of products and heavy sorting burden: Because each crushing equipment operates independently, the crushing force field is singular and cannot be precisely controlled, resulting in a wide particle size distribution range of products in each stage. Millimeter-sized intermediate blocks, target particle size particles and micron-sized over-crushed fine powder are seriously mixed. This not only leads to a low direct recovery rate of target particle size products (such as 1-5mm), but also transfers all the sorting pressure to subsequent expensive screening or air classifying equipment, greatly increasing the overall energy consumption and cost. Rigid process flow, lack of dynamic control and material circulation: Traditional crushing lines are open-loop, unidirectional rigid processes that cannot be quickly switched and flexibly adjusted according to downstream demand for products of different particle sizes. Those "critical particles" that are close in size but do not meet the target specifications (such as 0.5-1mm particles) lack an effective recycling and re-crushing mechanism and are usually discharged directly from the system as unqualified products, resulting in raw material waste and yield loss. High risk of micronized powder deposition and system blockage: Boron carbide powder has high hardness and poor flowability. During the crushing process, a large amount of micronized fine powder is easily deposited and caking at the bottom of the equipment chamber and pipe corners. Especially when the system is started or stopped or running at low load, it is very easy to form stubborn blockage points, which seriously affects the continuity and stability of production and requires frequent shutdowns for cleaning. Low energy utilization efficiency: The crushing energy is concentrated on a few mechanical contact points, and some of the energy is converted into useless heat and noise. Furthermore, the excessive crushing of already qualified particles results in energy waste. At the same time, the system lacks active control over the crushing environment (such as humidity and powder concentration).

[0004] Therefore, there is an urgent need for an innovative crushing device and process that can fundamentally change the traditional model and achieve efficient, controllable and continuous preparation of boron carbide crystals from bulk to products of target particle size. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving boron carbide smelting crystal large-scale crushing device and process, which has the advantages of high integration, controllable particle size, energy saving and environmental protection and continuous operation, and solves the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An energy-saving boron carbide smelting crystal large block crushing device includes a support frame, a jaw crusher fixed to the upper end of the support frame, a discharge hopper set on one side of the jaw crusher, and a return grinding body fixed to the upper end of the discharge hopper. The return grinding body has a gourd-shaped structure and a cavity inside. Two second grooves are opened through the middle of the inner wall of the cavity towards the center of the return grinding body. Two third grooves are opened through the inner wall of the return grinding body. The third grooves are interconnected with the cavity. A guide plate is fixed to the inner wall of the third groove. It also includes a support on the support frame, a drive assembly and an air-filling assembly on the support, a ventilator on the outer wall of the grinding mill body, a heating mechanism on the ventilator body, an air intake mechanism on the middle of the outer wall of the grinding mill body, a discharge mechanism on the lower part of the grinding mill body, an interception mechanism on the grinding mill body, two sediment removal mechanisms on the bottom of the inner wall of the grinding mill body, a crushing assembly and a central guide assembly on the inner wall of the grinding mill body, and an openable or closable discharge channel fixed to the outer wall of the grinding mill body. The crushing assembly includes an upper crushing mechanism disposed on the upper part of the inner wall of the grinding mill and a lower crushing mechanism disposed on the lower part of the inner wall of the grinding mill. The input end of the crushing assembly and the input end of the center guide assembly are both connected to the output end of the drive assembly. The air intake mechanism is connected to the air outlet of the ventilator, the air intake of the ventilator is connected to the inflation component, and the other air outlet of the inflation component is connected to the feeding mechanism through a pipe.

[0007] Preferably, the heating mechanism includes two fixed blocks fixed to the inner wall of the ventilation body and an air heating block fixed to the two fixed blocks. The air intake mechanism includes a first air intake channel fixed to the outer wall of the grinding body and a second air intake channel fixed to the air intake end of the first air intake channel. The air intake end of the second air intake channel is connected to the air outlet end of the ventilation body.

[0008] The design of the heating and air intake mechanisms realizes a highly efficient and energy-saving hot air circulation system. The air heating block heats the air entering the ventilation body to generate hot air at a suitable temperature, which is evenly introduced into the grinding body through the first and second air intake channels. This helps to maintain the temperature stability of boron carbide crystals during the crushing process and prevents the crystals from becoming more brittle or adhering due to sudden temperature changes, thereby improving crushing efficiency and product particle size uniformity. At the same time, the hot air can assist in drying materials, reduce the impact of moisture on the crushing process, and reduce energy loss.

[0009] Preferably, the inflation assembly includes a first inflation pump fixed to the support, and the feeding mechanism includes a fixed frame fixed to the discharge hopper, a third cylinder fixed to the fixed frame, a lifting column fixed to the upper end of the output shaft of the third cylinder, and a discharge cylinder fixed to the lower end of the grinding body. The outer peripheral wall of the lifting column is slidably disposed on the inner wall of the discharge cylinder, and an inflation hole for air intake is provided through the outer peripheral wall of the discharge cylinder. The inflation hole and the air outlet of the first inflation pump are connected by a pipe.

[0010] The synergistic effect of the inflation component and the feeding mechanism improves the smoothness and controllability of material conveying. The first inflation pump injects compressed air into the discharge cylinder through the inflation hole, forming an airflow to assist the material flow, effectively preventing the boron carbide particles from clogging or bridging during the discharge process, ensuring continuous and stable feeding. The lifting column can precisely adjust the opening of the discharge port under the drive of the third cylinder, realizing flexible control of material flow, adapting to the particle size requirements of different crushing stages, reducing mechanical resistance and energy consumption, and improving crushing efficiency.

[0011] Preferably, the unloading mechanism includes two inclined guide plates fixed to the inner wall of the grinding body, an insertion port that penetrates and is opened at the lower part of one end of the grinding body, a sliding plate that is slidably disposed on the inner wall of the insertion port, a fixed frame fixed to both ends of the inner wall of the grinding body, and a feeding trough that penetrates and is opened at the lower end of the fixed frame. There is a gap between the two inclined guide plates, and the gap is located directly above the feeding trough.

[0012] The unloading mechanism's structural design enables rapid and thorough material discharge and cleaning. The inclined guide plate guides the crushed boron carbide crystals to slide naturally towards the discharge port, utilizing gravity-assisted flow to reduce energy consumption. The pull plate can slide flexibly along the insertion port to seal or open the unloading channel. It is easy to operate and can quickly complete the unloading operation, shortening equipment downtime. The fixed frame and discharge chute ensure centralized material discharge, avoiding residue and cross-contamination.

[0013] Preferably, the interception mechanism includes a fixed plate fixed to the upper part of the outer wall of the grinding body, a first cylinder fixed to the upper part of the fixed plate, a sealing block fixed to the lower end of the output shaft of the first cylinder, a spring fixed to the upper end of the sealing block, a first groove extending through the lower part of the outer wall of the grinding body, a separation plate fixed to the inner wall of the grinding body cavity, and multiple through holes extending through the separation plate. The upper end of the spring and the lower end of the fixed plate are fixed to each other. The lower half of the sealing block is slidably disposed on the inner wall of the first groove, and the lower end of the sealing block is in contact with the upper end face of the separation plate.

[0014] The interception mechanism enables material classification and precise control, improving the refinement and energy efficiency of the crushing process. The through holes on the separation plate allow fine powder to pass through, while large boron carbide crystals are intercepted, achieving preliminary screening, reducing over-crushing and energy waste. The blocking block can precisely open and close the first tank under the drive of the first cylinder. Combined with spring buffering, it avoids damage to the equipment from hard impacts and extends its service life.

[0015] Preferably, the deposited powder removal mechanism includes a U-shaped block fixed to the lower part of the outer wall of the grinding mill, a V-shaped block fixed to both sides of the inner wall of the U-shaped block, a stop block slidably disposed on the inner wall of the V-shaped block, a second cylinder fixed to the lower end of the U-shaped block, multiple air inlets opened through the lower end of the U-shaped block, an air inlet box fixed to the lower end of the U-shaped block, a jaw crusher fixed to the lower end of the U-shaped block, and an air inlet cylinder fixed to the inner wall of the air inlet holes. The output shaft of the second cylinder passes through the U-shaped block and the V-shaped block and is fixed to the lower end of the stop block. The air filling assembly also includes a second air pump fixed to the support. The air outlet of the second air pump is connected to the air inlet of the air inlet box through a pipe.

[0016] The deposited powder removal mechanism efficiently cleans the inside of the equipment using a pneumatic method, ensuring continuous operation and energy conservation and environmental protection. The second air pump provides compressed air, which is injected into the bottom of the grinding body through the air inlet box and air inlet hole. The airflow blows directionally through the air inlet cylinder. The second cylinder is opened to move the baffle upward, suspending and carrying away the boron carbide powder deposited in the V-shaped block, preventing accumulation that could lead to blockage and increased friction.

[0017] Preferably, the upper crushing mechanism includes a first crushing roller rotatably mounted on the upper part of the inner wall of the grinding mill and a first inner magnetic rotor fixed to both ends of the shaft of the first crushing roller; the lower crushing mechanism includes a second crushing roller rotatably mounted on the lower part of the inner wall of the grinding mill and a third inner magnetic rotor fixed to both ends of the shaft of the second crushing roller; the central guiding assembly includes a central roller rotatably mounted on the middle part of the inner wall of the grinding mill and a second inner magnetic rotor fixed to both ends of the shaft of the central roller; and there is a gap between the outer peripheral wall of the central roller and the inner wall of the grinding mill.

[0018] The multi-stage magnetic drive design of the upper crushing mechanism, lower crushing mechanism, and central guide assembly realizes a highly efficient and energy-saving crushing process. The first and second crushing rollers perform coarse and fine crushing, while the central roller guides the material flow, optimizes the crushing path, and improves particle size uniformity. The inner and outer magnetic rotors work together to replace the traditional mechanical connection with magnetic transmission, reducing friction loss and energy leakage. The transmission efficiency is as high as 90% or more, significantly reducing energy consumption. Magnetic drive also avoids lubricating oil contamination and maintains the purity of boron carbide crystals.

[0019] Preferably, the drive assembly includes a first motor, a second motor, and a third motor mounted on a support. A first external magnetic rotor is fixedly connected to the output shaft of the first motor, a second external magnetic rotor is fixedly connected to the output shaft of the second motor, and a third external magnetic rotor is fixedly connected to the output shaft of the third motor. The first external magnetic rotor corresponds to the first internal magnetic rotor, the second internal magnetic rotor corresponds to the second external magnetic rotor, and the third external magnetic rotor corresponds to the third internal magnetic rotor.

[0020] The independent motor and magnetic rotor configuration of the drive components enables precise and energy-saving power transmission. The first, second, and third motors drive the upper crushing mechanism, the central guide component, and the lower crushing mechanism, respectively, allowing independent adjustment of the speed and torque of each part to adapt to different hardness and particle size requirements of boron carbide crystals, optimize crushing effect and reduce energy waste. The magnetic rotor drive does not require physical contact, eliminating the wear, noise, and energy loss of traditional gear or belt drives, improving transmission efficiency and significantly saving energy.

[0021] Preferably, a blocking mechanism is installed on the discharge channel. The discharge end of the discharge channel is located above the feed end of the jaw crusher. The blocking mechanism includes a bracket fixed to the upper end of the discharge channel, a fourth cylinder fixed to the upper end of the bracket, an air sealing block fixed to the lower end of the output shaft of the fourth cylinder, and a fourth trough that penetrates the upper end of the discharge channel. The air sealing block is slidably disposed on the inner wall of the fourth trough.

[0022] The blocking mechanism ensures the sealing and controllability of the discharge process, improving energy efficiency and safety. The fourth cylinder drives the sealing block to slide precisely within the fourth tank, enabling rapid opening and closing of the discharge channel. This prevents material leakage and the entry of external contaminants, maintaining the stability of the crushing environment. The sealing design reduces heat and airflow loss, optimizing energy utilization efficiency. The mechanism can also automatically close in emergencies, preventing equipment damage and safety accidents.

[0023] This invention also provides a process for an energy-saving boron carbide smelting crystal bulk crushing device, which employs the aforementioned energy-saving boron carbide smelting crystal bulk crushing device, and its steps are as follows: S1. Primary Crushing and Feeding: Large boron carbide crystals are fed into the jaw crusher for primary crushing to obtain small pieces of material with a particle size ≤50mm. Open the feed inlet at the top of the grinding body, ensuring that the feed inlet is completely open and unobstructed; The small pieces of material after primary crushing are fed back into the mill body at a uniform speed through the feed inlet, and the material is prevented from accumulating at the edge of the feed inlet during the feeding process. After feeding is completed, close the feed inlet at the top of the grinding body to ensure the airtightness of the grinding body; S2. In-cavity pneumatic preparation and synchronous drive crushing: The third cylinder of the feeding mechanism is started by the PLC controller, driving the lifting column to move down along the inner wall of the discharge cylinder until the lifting column completely closes the lower discharge port of the discharge cylinder; the first air pump of the air filling component is started, the output air pressure is adjusted to the preset value, and dry compressed air is continuously filled into the air filling hole on the outer peripheral wall of the discharge cylinder through the pipeline, so that the gas diffuses upward to the lower cavity of the return grinding body to form a pre-pressurized airflow environment; at the same time, the first motor, second motor and third motor of the drive component are started synchronously: the first motor is connected to the air filling hole. Through the magnetic coupling between the first outer magnetic rotor and the first inner magnetic rotor, the first crushing roller of the upper crushing mechanism is driven to rotate at high speed; the third motor drives the second crushing roller of the lower crushing mechanism to rotate synchronously through the magnetic coupling between the third outer magnetic rotor and the third inner magnetic rotor; the second motor drives the central roller of the central guiding component to rotate through the magnetic coupling between the second outer magnetic rotor and the second inner magnetic rotor, and the small pieces of material are evenly distributed to the crushing areas of the first crushing roller and the second crushing roller through the guiding effect of the central roller, so as to realize graded crushing and material guidance; S3. Powder Inlet Chamber: After the upper and lower crushing mechanisms have been running for a preset time, the pull plate of the unloading mechanism is manually or pulled out by the drive device, so that the powdered material generated by the first crushing roller falls through the gap between the inclined guide plates on the inner wall of the return mill body, and falls into the wall cavity of the return mill body through the feeding chute at the lower end of the fixed frame. At the same time, some powder material accumulates in the upper space of the discharge cylinder, which is connected to the wall cavity of the return mill body. After the powder material is introduced, the pull plate is pushed back into the inner wall of the inlet to reseal the lower channel of the return mill body. S4. Pressure Air Conveying and Secondary Grinding: The PLC controller controls the third cylinder to drive the lifting column to move upward along the inner wall of the discharge cylinder, so that the lifting column releases the blockage of the air inlet on the discharge cylinder; the dry compressed air continuously output by the first air pump enters the discharge cylinder and the cavity of the wall through the air inlet, forming a strong upward airflow, which blows the powdered material accumulated in the cavity upward; under the push of the pressure air, the powdered material passes through multiple through holes on the separation plate of the interception mechanism, and enters the second groove in the middle of the inner wall of the return grinding body cavity under the guidance of the airflow, and finally flows into the crushing area of ​​the second crushing roller of the lower crushing mechanism through the second groove, where the continuously rotating second crushing roller performs secondary grinding and crushing on the powdered material, refining the particle size of the material; S5. Hot Air Assistance and Internal Circulation: The second air pump of the air-filling component is started to continuously supply air to the ventilation body. At the same time, the air heating block of the heating mechanism is turned on to heat the air in the ventilation body to 50-80℃. The heated hot air is injected into the wall cavity of the return grinding body through the second air inlet channel and the first air inlet channel of the air inlet mechanism, further enhancing the air pressure in the cavity, improving the flowability of the powder material, and assisting in pressing the powder adhering to the inner wall of the cavity into the second trough. During this process, some powder with smaller particle size moves upward along the wall cavity to the third trough under the action of strong air pressure. Under the guidance of the guide plate on the inner wall of the third trough, it falls back to the crushing area of ​​the first crushing roller of the upper crushing mechanism, realizing the internal circulation crushing of the material and ensuring the uniformity of crushing. S6. Finished Product Sorting and Material Circulation: After the secondary grinding is completed, the fourth cylinder of the blocking mechanism is activated by the PLC controller, driving the sealing block to rise along the inner wall of the fourth tank and opening the discharge channel. Under the action of the airflow in the cavity, a portion of the target powder material that reaches the preset particle size range is discharged through the discharge channel and enters the subsequent collection device; another portion of the powder material that does not reach the target particle size falls back into the jaw crusher through the discharge end of the discharge channel under the combined action of airflow and gravity, and re-participates in the primary crushing cycle, realizing the closed-loop processing of materials. S7. Online Cleaning and Final Drainage: During the crushing process or intervals, the deposited powder removal mechanism is activated for online cleaning: Compressed air output from the second air pump is diverted through the air inlet box and sprayed into the bottom of the return mill body through the air inlet cylinder in multiple air inlets. At the same time, the second cylinder drives the baffle to slide up and down on the inner wall of the V-shaped block, disturbing the powder deposited at the bottom of the return mill body, preventing the material from agglomerating and blowing it up to re-enter the cycle. When the crushing process is completely finished, the third cylinder drives the lifting column to move down again through the PLC controller to close the lower end of the discharge cylinder. The suction plate is pulled out, allowing the material remaining in the cavity of the return mill body wall, the discharge cylinder, and the bottom of the device to be guided by the inclined guide plate under gravity and completely discharged from the system through the discharge chute, completing the equipment cleaning.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up an upper crushing mechanism, a lower crushing mechanism, and a central guiding component, and utilizing the guiding effect of the central roller to evenly distribute the material to different crushing zones, graded crushing is achieved; combined with the separation plate and through holes of the interception mechanism, fine powder and coarse particles are initially screened to avoid over-crushing; finally, the qualified powder is discharged through the discharge channel under the action of airflow, and the unqualified particles fall back to the jaw crusher for re-crushing, forming a closed loop. This design results in high product particle size concentration, significantly reducing the processing pressure of subsequent screening or grading equipment, and improving the direct recovery rate of target particle size products; 2. Through the cooperation of the return mill wall cavity, the second tank, the third tank and the guide plate, the internal circulation and re-crushing of powder materials are realized under the assistance of pneumatic conveying and hot air. Unqualified particles fall back to the jaw crusher through the discharge channel and participate in the crushing process again. This system realizes the online circulation and re-crushing of "critical particles", avoids raw material waste, improves the overall yield, and can flexibly adjust the airflow parameters and crusher operating status according to the product particle size requirements. 3. The deposited powder removal mechanism uses a second air pump to spray compressed air to the bottom of the grinding body, while driving the baffle to slide back and forth to disturb the deposited powder and prevent caking; the hot air auxiliary system further improves the powder flowability and reduces adhesion. This design enables online cleaning without frequent shutdowns, significantly improving the continuous operation capability and stability of the equipment. 4. The crushing roller and center roller are driven by magnetic coupling, avoiding friction loss and lubrication contamination caused by mechanical contact, resulting in high transmission efficiency. Pneumatic conveying and hot air circulation replace part of the mechanical conveying, reducing power consumption. Staged crushing and closed-loop circulation reduce energy waste caused by over-crushing. The overall device has a high degree of integration, significantly reduces energy consumption, and meets the requirements of green manufacturing. 5. This invention, through a graded crushing design consisting of an upper crushing mechanism, a lower crushing mechanism, and a central guiding component, combined with preliminary screening by an interception mechanism and airflow separation and closed-loop reflux in the discharge channel, significantly improves the concentration of product particle size and the direct recovery rate of the target product, reducing the load on subsequent sorting. Utilizing the cavity, trough, and guide plate structure of the return mill wall, internal circulation and online re-crushing of materials are achieved with the assistance of pneumatic and hot air. Flexible adjustment of process parameters effectively avoids raw material waste. The deposited powder removal mechanism, in conjunction with the hot air system, achieves online cleaning and anti-caking, ensuring continuous and stable operation of the equipment. The entire system adopts magnetic coupling transmission, combined with pneumatic conveying and hot air circulation, which greatly reduces mechanical friction and power consumption. In addition, the drive system adopts a multi-motor independent design and intelligent collaborative control, realizing on-demand power supply and load optimization for the core power unit, further improving the overall energy efficiency of the system. Attached Figure Description

[0025] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention; Figure 2 The diagram shown is a three-dimensional cross-sectional view of the ventilation body of the present invention. Figure 3 The diagram shown is a three-dimensional structural schematic of the pressurization mechanism of the present invention; Figure 4 The diagram shown is a three-dimensional structural schematic of the unloading mechanism of the present invention; Figure 5 The diagram shown is a three-dimensional structural schematic of the interception mechanism of the present invention; Figure 6 The diagram shown is a three-dimensional structural schematic of the deposition powder removal mechanism of the present invention; Figure 7 The diagram shown is a three-dimensional structural schematic of the crushing component and the central guiding component of the present invention. Figure 8 The diagram shown is a three-dimensional structural schematic of the drive component of the present invention; Figure 9 The diagram shown is a three-dimensional structural schematic of the feeding mechanism of the present invention; Figure 10 The diagram shown is a three-dimensional structural schematic of the blocking mechanism of the present invention.

[0026] Reference numerals: 1. Support frame; 2. Jaw crusher; 3. Discharge hopper; 4. Return grinding body; 5. Support; 501. First motor; 502. First external magnetic rotor; 503. First air pump; 504. Second air pump; 505. Second motor; 506. Second external magnetic rotor; 507. Third motor; 508. Third external magnetic rotor; 6. Ventilation body; 601. Fixing block; 602. Air heating block; 603. First air inlet channel; 604. Second air inlet channel; 7. Inclined guide plate; 8. Pull-out plate; 9. Fixing frame; 10. Discharge chute; 11. Separation plate; 12. Through hole; 13. First trough body; 14. Sealing block; 15. Spring; 16. Fixing plate; 17. First cylinder; 18. Second trough; 19. U-shaped block; 20. V-shaped block; 21. Stop block; 22. Second cylinder; 23. Air inlet; 24. Air inlet box; 25. Air inlet cylinder; 26. First crushing roller; 27. First inner magnetic rotor; 28. Center roller; 29. ​​Second inner magnetic rotor; 30. Second crushing roller; 31. Third inner magnetic rotor; 32. Third trough; 33. Guide plate; 34. Discharge cylinder; 35. Fixing frame; 36. Third cylinder; 37. Lifting column; 38. Support; 39. Fourth cylinder; 40. Sealing block; 41. Discharge channel; 42. Fourth trough. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To address the problems of wide particle size distribution of products, lack of online re-crushing mechanism for critical particles, easy deposition and caking of fine powder leading to system blockage, and low energy utilization efficiency in existing crushing processes, the following technical solution is proposed. Please refer to [link / reference]. Figures 1-10 ; An energy-saving boron carbide smelting crystal large-block crushing device is characterized by comprising: a support frame 1, a jaw crusher 2 fixed to the upper end of the support frame 1, a discharge hopper 3 disposed on one side of the jaw crusher 2, and a return grinding body 4 fixed to the upper end of the discharge hopper 3. The return grinding body 4 has a gourd-shaped structure and a cavity inside. Two second grooves 18 are opened through the middle of the inner wall of the cavity in the direction towards the center of the return grinding body 4. Two third grooves 32 are opened through the inner wall of the return grinding body 4. The third grooves 32 are interconnected with the cavity. A guide plate 33 is fixedly connected to the inner wall of the third grooves 32. It also includes a support 5 on the support frame 1, a drive assembly and an air-filling assembly on the support 5, a ventilator 6 on the outer wall of the grinding body 4, a heating mechanism inside the ventilator 6, an air intake mechanism in the middle of the outer wall of the grinding body 4, a discharge mechanism near the bottom inside the grinding body 4, an interception mechanism on the grinding body 4, two sediment removal mechanisms at the bottom of the inner wall of the grinding body 4, a crushing assembly and a central guide assembly inside the grinding body 4, and an openable or closable discharge channel 41 fixed to the outer wall of the grinding body 4; The crushing assembly includes an upper crushing mechanism disposed on the upper part of the inner wall of the grinding body 4 and a lower crushing mechanism disposed on the lower part of the inner wall of the grinding body 4. The input end of the crushing assembly and the input end of the center guide assembly are both connected to the output end of the drive assembly. The air intake mechanism is connected to the air outlet of the ventilation body 6, the air intake of the ventilation body 6 is connected to the inflation component, and the other air outlet of the inflation component is connected to the feeding mechanism through a pipe.

[0029] In operation, large smelting crystal blocks are crushed using jaw crusher 2, and smaller pieces are fed into the return mill 4. The drive mechanism is activated to crush the smaller crystal blocks using the upper and lower crushing mechanisms. First, the feeding mechanism is closed, and the feeding mechanism is inflated using the air-pressurizing component, allowing dry compressed air to be blown downwards through the feeding mechanism into the return mill 4. Then, the unloading mechanism is activated to allow the secondary crushed material to enter the cavity. The unloading mechanism is then closed, and the powdered material is propelled through the cavity and interception mechanism into the second tank 18 by pressurized air, and then flows into the lower crusher. The grinding process is carried out in the secondary grinding chamber. The air filling component is turned on to inflate the ventilation body 6. The heating mechanism inside the ventilation body 6 can heat the air. The hot air is injected into the cavity of the return grinding body 4 through the air intake mechanism, which helps to press the powder into the second trough 18. In addition, when the air pressure is high enough, some powder will climb up the cavity of the return grinding body 4 to the inner wall of the third trough 32 and fall down along the guide plate 33 to the upper crushing mechanism for further crushing. In addition, some powder can be discharged through the discharge channel 41 by opening the blocking mechanism and fall into the jaw crusher 2.

[0030] In this embodiment, specifically: the heating mechanism includes two fixed blocks 601 fixed to the inner wall of the ventilation body 6 and an air heating block 602 fixed to the two fixed blocks 601; the air intake mechanism includes a first air intake channel 603 fixed to the outer wall of the grinding body 4 and a second air intake channel 604 fixed to the air intake end of the first air intake channel 603, and the air intake end of the second air intake channel 604 is connected to the air outlet end of the ventilation body 6.

[0031] In this embodiment, specifically: the inflation assembly includes a first inflation pump 503 fixed to the support 5, and the feeding mechanism includes a fixed frame 35 fixed to the discharge hopper 3, a third cylinder 36 fixed to the fixed frame 35, a lifting column 37 fixed to the upper end of the output shaft of the third cylinder 36, and a discharge cylinder 34 fixed to the lower end of the grinding body 4. The outer peripheral wall of the lifting column 37 is slidably disposed on the inner wall of the discharge cylinder 34, and an inflation hole for air intake is opened through the outer peripheral wall of the discharge cylinder 34. The inflation hole and the air outlet of the first inflation pump 503 are connected by a pipe.

[0032] In this embodiment, specifically: the unloading mechanism includes two inclined guide plates 7 fixed to the inner wall of the grinding body 4, an insertion port that penetrates and is opened at the lower part of one end of the grinding body 4, a draw plate 8 that is slidably disposed on the inner wall of the insertion port, a fixed frame 9 fixed to both ends of the inner wall of the grinding body 4, and a discharge trough 10 that penetrates and is opened at the lower end of the fixed frame 9. There is a gap between the two inclined guide plates 7, and the gap is located directly above the discharge trough 10.

[0033] In this embodiment, specifically: the interception mechanism includes a fixing plate 16 fixed to the upper part of the outer wall of the grinding body 4, a first cylinder 17 fixed to the upper end of the fixing plate 16, a sealing block 14 fixed to the lower end of the output shaft of the first cylinder 17, a spring 15 fixed to the upper end of the sealing block 14, a first groove 13 penetrating the lower part of the outer wall of the grinding body 4, a separation plate 11 fixed to the inner wall of the cavity of the grinding body 4, and a plurality of through holes 12 penetrating the separation plate 11. The upper end of the spring 15 and the lower end of the fixing plate 16 are fixed to each other. The lower half of the sealing block 14 is slidably disposed on the inner wall of the first groove 13, and the lower end of the sealing block 14 is in contact with the upper end face of the separation plate 11.

[0034] In this embodiment, specifically: the deposited powder removal mechanism includes a U-shaped block 19 fixed to the lower part of the outer wall of the grinding body 4, a V-shaped block 20 fixed to both sides of the inner wall of the U-shaped block 19, a stop block 21 slidably disposed on the inner wall of the V-shaped block 20, a second cylinder 22 fixed to the lower end of the U-shaped block 19, multiple air inlets 23 opened through the lower end of the U-shaped block 19, an air inlet box 24 fixed to the lower end of the U-shaped block 19, a jaw crusher 2 fixed to the lower end of the U-shaped block 19, and an air inlet cylinder 25 fixed to the inner wall of the air inlet holes 23. The output shaft of the second cylinder 22 passes through the U-shaped block 19 and the V-shaped block 20 and is fixed to the lower end of the stop block 21. The air filling assembly also includes a second air pump 504 fixed to the support 5. The air outlet of the second air pump 504 is connected to the air inlet of the air inlet box 24 through a pipe.

[0035] In this embodiment, specifically: the upper crushing mechanism includes a first crushing roller 26 rotatably mounted on the upper part of the inner wall of the grinding body 4 and a first inner magnetic rotor 27 fixed to both ends of the shaft of the first crushing roller 26; the lower crushing mechanism includes a second crushing roller 30 rotatably mounted on the lower part of the inner wall of the grinding body 4 and a third inner magnetic rotor 31 fixed to both ends of the shaft of the second crushing roller 30; the central guiding assembly includes a central roller 28 rotatably mounted on the middle part of the inner wall of the grinding body 4 and a second inner magnetic rotor 29 fixed to both ends of the shaft of the central roller 28; and there is a gap between the outer peripheral wall of the central roller 28 and the inner wall of the grinding body 4.

[0036] In this embodiment, specifically: the drive assembly includes a first motor 501, a second motor 505, and a third motor 507 mounted on the support 5. A first external magnetic rotor 502 is fixedly connected to the output shaft of the first motor 501, a second external magnetic rotor 506 is fixedly connected to the output shaft of the second motor 505, and a third external magnetic rotor 508 is fixedly connected to the output shaft of the third motor 507. The first external magnetic rotor 502 corresponds to the first internal magnetic rotor 27, the second internal magnetic rotor 29 corresponds to the second external magnetic rotor 506, and the third external magnetic rotor 508 corresponds to the third internal magnetic rotor 31.

[0037] In this embodiment, specifically: a blocking mechanism is installed on the discharge channel 41. The discharge end of the discharge channel 41 is located above the feed end of the jaw crusher 2. The blocking mechanism includes a bracket 38 fixed to the upper end of the discharge channel 41, a fourth cylinder 39 fixed to the upper end of the bracket 38, a sealing block 40 fixed to the lower end of the output shaft of the fourth cylinder 39, and a fourth groove 42 that penetrates the upper end of the discharge channel 41. The sealing block 40 is slidably disposed on the inner wall of the fourth groove 42.

[0038] This invention also provides a process for an energy-saving boron carbide smelting crystal bulk crushing device, which employs the energy-saving boron carbide smelting crystal bulk crushing device described above, and the steps are as follows: S1. Primary Crushing and Feeding: Large boron carbide crystals are fed into the jaw crusher 2 for primary crushing to obtain small pieces of material with a particle size ≤50mm. Open the feed inlet at the top of the return mill body 4, ensuring that the feed inlet is completely open and unobstructed; The small pieces of material after primary crushing are fed into the grinding body 4 at a uniform speed through the feed inlet, and the material is prevented from accumulating at the edge of the feed inlet during the feeding process. After feeding is completed, close the feed inlet at the top of the return mill 4 to ensure the airtightness of the return mill 4. S2. In-cavity pneumatic preparation and synchronous drive crushing: The third cylinder 36 of the feeding mechanism is started by the PLC controller, driving the lifting column 37 to move down along the inner wall of the discharge cylinder 34 until the lifting column 37 completely closes the lower discharge port of the discharge cylinder 34; the first air pump 503 of the air filling assembly is started, the output air pressure is adjusted to the preset value, and dry compressed air is continuously injected into the air filling hole on the outer peripheral wall of the discharge cylinder 34 through the pipeline, so that the gas diffuses upward to the lower cavity of the return grinding body 4 to form a pre-pressurized airflow environment; at the same time, the first motor 501, the second motor 505 and the third motor 507 of the drive assembly are started synchronously: the first motor 501 is driven by the first The magnetic coupling between the outer magnetic rotor 502 and the first inner magnetic rotor 27 drives the first crushing roller 26 of the upper crushing mechanism to rotate at high speed; the third motor 507 drives the second crushing roller 30 of the lower crushing mechanism to rotate synchronously through the magnetic coupling between the third outer magnetic rotor 508 and the third inner magnetic rotor 31; the second motor 505 drives the central roller 28 of the central guide assembly to rotate through the magnetic coupling between the second outer magnetic rotor 506 and the second inner magnetic rotor 29. The guiding effect of the central roller 28 evenly distributes the small pieces of material into the crushing areas of the first crushing roller 26 and the second crushing roller 30, thereby achieving graded crushing and material guidance. S3. Powder Inlet Chamber: After the upper and lower crushing mechanisms have been running for a preset time, the pull plate 8 of the unloading mechanism is manually or pulled out by the drive device, so that the powdered material generated by the first crushing roller 26 falls through the gap between the inclined guide plates 7 on the inner wall of the return mill 4 and falls into the wall cavity of the return mill 4 through the feeding chute 10 at the lower end of the fixed frame 9. At the same time, some powder material accumulates in the upper space of the discharge cylinder 34, which is connected to the wall cavity of the return mill 4. After the powder material is introduced, the pull plate 8 is pushed back into the inner wall of the inlet to reseal the lower channel of the return mill 4. S4. Pressure Air Conveying and Secondary Grinding: The PLC controller controls the third cylinder 36 to drive the lifting column 37 to move upward along the inner wall of the discharge cylinder 34, so that the lifting column 37 releases the blockage of the air inlet on the discharge cylinder 34; the dry compressed air continuously output by the first air pump 503 enters the discharge cylinder 34 and the wall cavity through the air inlet, forming an upward strong airflow, which blows the powdered material accumulated in the cavity upward; under the push of the pressure air, the powdered material passes through multiple through holes 12 on the separation plate 11 of the interception mechanism, and enters the second groove 18 in the middle of the inner wall of the wall cavity of the return grinding body 4 under the guidance of the airflow, and finally flows into the crushing area of ​​the second crushing roller 30 of the lower crushing mechanism through the second groove 18, where the continuously rotating second crushing roller 30 performs secondary grinding and crushing on the powdered material, refining the particle size of the material; S5. Hot Air Assistance and Internal Circulation: The second air pump 504 of the air-filling component is started to continuously supply air into the ventilation body 6. At the same time, the air heating block 602 of the heating mechanism is turned on to heat the air in the ventilation body 6 to 50-80°C. The heated hot air is injected into the wall cavity of the grinding body 4 through the second air inlet channel 604 and the first air inlet channel 603 of the air inlet mechanism, further enhancing the air pressure in the cavity, improving the flowability of the powder material, and assisting in pressing the powder adhering to the inner wall of the cavity into the second trough 18. During this process, some powder with smaller particle size moves upward along the wall cavity to the third trough 32 under the action of strong air pressure. Under the guidance of the guide plate 33 on the inner wall of the third trough 32, it falls back into the crushing area of ​​the first crushing roller 26 of the upper crushing mechanism, realizing the internal circulation crushing of the material and ensuring the uniformity of crushing. S6. Finished Product Sorting and Material Circulation: After the secondary grinding is completed, the fourth cylinder 39 of the blocking mechanism is activated by the PLC controller, driving the sealing block 40 to rise along the inner wall of the fourth tank 42 and opening the discharge channel 41. Under the action of the airflow in the cavity, a portion of the target powder material that reaches the preset particle size range is discharged through the discharge channel 41 and enters the subsequent collection device; another portion of the powder material that does not reach the target particle size falls back into the jaw crusher 2 through the discharge end of the discharge channel 41 under the combined action of airflow and gravity, and re-participates in the primary crushing cycle to achieve closed-loop processing of materials. S7. Online Cleaning and Final Drainage: During the crushing process or intervals, the deposited powder removal mechanism is activated for online cleaning: Compressed air output by the second air pump 504 is diverted through the air inlet box 24 and sprayed into the bottom of the return mill 4 through the air inlet cylinder 25 in the multiple air inlet holes 23. At the same time, the second cylinder 22 drives the stop block 21 to slide up and down on the inner wall of the V-shaped block 20, disturbing the powder deposited at the bottom of the return mill 4, preventing the material from agglomerating and blowing it up to re-enter the cycle; when the crushing process is completely finished, the third cylinder 36 is controlled by the PLC controller to drive the lifting column 37 to move down again, closing the lower end of the discharge cylinder 34; the suction plate 8 is pulled out, so that the material remaining in the cavity of the return mill 4 wall, the discharge cylinder 34 and the bottom of the device is guided by gravity through the inclined guide plate 7 and completely discharged from the system through the discharge chute 10, completing the equipment cleaning.

[0039] In one specific embodiment, the output air pressure of the first air pump 503 can be adjusted between 0.3 and 0.6 MPa to form a sufficient pre-pressurized airflow in the lower part of the grinding body 4. Those skilled in the art can make adaptive adjustments to this air pressure value according to the actual material load and particle size requirements of production.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An energy-saving device for crushing large blocks of boron carbide smelting crystals, characterized in that: It includes a support frame (1), a jaw crusher (2) fixed to the upper end of the support frame (1), a discharge hopper (3) set on one side of the jaw crusher (2) and a return grinding body (4) fixed to the upper end of the discharge hopper (3). The return grinding body (4) has a gourd-shaped structure and a cavity inside. Two second grooves (18) are opened through the middle of the inner wall of the cavity towards the center of the return grinding body (4). Two third grooves (32) are opened through the inner wall of the return grinding body (4). The third grooves (32) are interconnected with the cavity. A guide plate (33) is fixed to the inner wall of the third grooves (32). It also includes a support (5) on the support frame (1), a drive assembly and an air-filling assembly on the support (5), a ventilator (6) on the outer wall of the grinding body (4), a heating mechanism in the ventilator (6), an air intake mechanism in the middle of the outer wall of the grinding body (4), a discharge mechanism in the grinding body (4) near the bottom, an interception mechanism on the grinding body (4), two sediment removal mechanisms at the bottom of the inner wall of the grinding body (4), a crushing assembly and a central guide assembly in the grinding body (4), and an openable or closable discharge channel (41) fixed to the outer wall of the grinding body (4). The crushing assembly includes an upper crushing mechanism disposed on the upper part of the inner wall of the grinding body (4) and a lower crushing mechanism disposed on the lower part of the inner wall of the grinding body (4). The input end of the crushing assembly and the input end of the center guide assembly are both connected to the output end of the drive assembly. The air intake mechanism is connected to the air outlet of the ventilation body (6), the air intake of the ventilation body (6) is connected to the inflation assembly, and the other air outlet of the inflation assembly is connected to the feeding mechanism through a pipe.

2. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 1, characterized in that: The heating mechanism includes two fixed blocks (601) fixed to the inner wall of the ventilation body (6) and an air heating block (602) fixed to the two fixed blocks (601). The air intake mechanism includes a first air intake channel (603) fixed to the outer wall of the grinding body (4) and a second air intake channel (604) fixed to the air intake end of the first air intake channel (603). The air intake end of the second air intake channel (604) is connected to the air outlet end of the ventilation body (6).

3. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 2, characterized in that: The inflation assembly includes a first inflation pump (503) fixed to the support (5), and the feeding mechanism includes a fixed frame (35) fixed to the discharge hopper (3), a third cylinder (36) fixed to the fixed frame (35), a lifting column (37) fixed to the upper end of the output shaft of the third cylinder (36), and a discharge cylinder (34) fixed to the lower end of the grinding body (4). The outer peripheral wall of the lifting column (37) is slidably disposed on the inner wall of the discharge cylinder (34), and an inflation hole for air intake is opened through the outer peripheral wall of the discharge cylinder (34). The inflation hole and the air outlet of the first inflation pump (503) are connected by a pipe.

4. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 3, characterized in that: The unloading mechanism includes two inclined guide plates (7) fixed to the inner wall of the grinding body (4), an insertion port that is opened through the lower part of one end of the grinding body (4), a sliding plate (8) that is slidably provided on the inner wall of the insertion port, a fixed frame (9) fixed to both ends of the inner wall of the grinding body (4), and a discharge trough (10) that is opened through the lower end of the fixed frame (9). There is a gap between the two inclined guide plates (7), and the gap is located directly above the discharge trough (10).

5. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 4, characterized in that: The interception mechanism includes a fixed plate (16) fixed to the upper part of the outer wall of the grinding body (4), a first cylinder (17) fixed to the upper end of the fixed plate (16), a blocking block (14) fixed to the lower end of the output shaft of the first cylinder (17), a spring (15) fixed to the upper end of the blocking block (14), a first groove (13) penetrating the lower part of the outer wall of the grinding body (4), a separation plate (11) fixed to the inner wall of the cavity of the grinding body (4), and multiple through holes (12) penetrating the separation plate (11). The upper end of the spring (15) and the lower end of the fixed plate (16) are fixed to each other. The lower half of the blocking block (14) is slidably disposed on the inner wall of the first groove (13). The lower end of the blocking block (14) is in contact with the upper end of the separation plate (11).

6. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 5, characterized in that: The deposited powder removal mechanism includes a U-shaped block (19) fixed to the lower part of the outer wall of the grinding body (4), a V-shaped block (20) fixed to both sides of the inner wall of the U-shaped block (19), a stop block (21) slidably disposed on the inner wall of the V-shaped block (20), a second cylinder (22) fixed to the lower end of the U-shaped block (19), multiple air inlets (23) opened through the lower end of the U-shaped block (19), and an air inlet box (24) fixed to the lower end of the U-shaped block (19). The second cylinder (22) is fixed to the lower end of the U-shaped block (19) and the air inlet cylinder (25) is fixed to the inner wall of the air inlet hole (23). The output shaft of the second cylinder (22) passes through the U-shaped block (19) and the V-shaped block (20) and is fixed to the lower end of the stop block (21). The inflation assembly also includes a second inflation pump (504) fixed to the support (5). The air outlet of the second inflation pump (504) is connected to the air inlet of the air inlet box (24) through a pipe.

7. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 6, characterized in that: The upper crushing mechanism includes a first crushing roller (26) rotatably mounted on the upper part of the inner wall of the grinding body (4) and a first inner magnetic rotor (27) fixed to both ends of the shaft of the first crushing roller (26). The lower crushing mechanism includes a second crushing roller (30) rotatably mounted on the lower part of the inner wall of the grinding body (4) and a third inner magnetic rotor (31) fixed to both ends of the shaft of the second crushing roller (30). The central guide assembly includes a central roller (28) rotatably mounted on the middle part of the inner wall of the grinding body (4) and a second inner magnetic rotor (29) fixed to both ends of the shaft of the central roller (28). There is a gap between the outer peripheral wall of the central roller (28) and the inner wall of the grinding body (4).

8. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 7, characterized in that: The drive assembly includes a first motor (501), a second motor (505), and a third motor (507) mounted on a support (5). A first external magnetic rotor (502) is fixed to the output shaft of the first motor (501), a second external magnetic rotor (506) is fixed to the output shaft of the second motor (505), and a third external magnetic rotor (508) is fixed to the output shaft of the third motor (507). The first external magnetic rotor (502) corresponds to the first internal magnetic rotor (27), the second internal magnetic rotor (29) corresponds to the second external magnetic rotor (506), and the third external magnetic rotor (508) corresponds to the third internal magnetic rotor (31).

9. The energy-saving boron carbide smelting crystal bulk crushing device according to claim 8, characterized in that: A blocking mechanism is installed on the discharge channel (41). The discharge end of the discharge channel (41) is located above the feed end of the jaw crusher (2). The blocking mechanism includes a bracket (38) fixed to the upper end of the discharge channel (41), a fourth cylinder (39) fixed to the upper end of the bracket (38), a sealing block (40) fixed to the lower end of the output shaft of the fourth cylinder (39), and a fourth trough (42) that passes through the upper end of the discharge channel (41). The sealing block (40) is slidably disposed on the inner wall of the fourth trough (42).

10. A process for an energy-saving boron carbide smelting crystal bulk crushing device, comprising the energy-saving boron carbide smelting crystal bulk crushing device as described in claim 9, characterized in that... Includes the following steps: S1. Primary Crushing and Feeding: Large boron carbide crystals are fed into the jaw crusher (2) for primary crushing to obtain small pieces of material with a particle size ≤50mm. Open the feed port at the top of the return mill body (4) to ensure that the feed port is completely open and unobstructed; After primary crushing, small pieces of material are fed into the grinding body (4) at a uniform speed through the feed inlet. During the feeding process, the material is prevented from accumulating at the edge of the feed inlet. After feeding is completed, close the feed port at the top of the return mill body (4) to ensure the airtightness of the return mill body (4); S2. In-cavity pneumatic preparation and synchronous drive crushing: The third cylinder (36) of the feeding mechanism is started by the PLC controller, driving the lifting column (37) to move down along the inner wall of the discharge cylinder (34) until the lifting column (37) completely closes the lower discharge port of the discharge cylinder (34); the first air pump (503) of the air filling component is started, the output air pressure is adjusted to the preset value, and dry compressed air is continuously filled into the air filling hole on the outer peripheral wall of the discharge cylinder (34) through the pipeline, so that the gas diffuses upward to the lower cavity of the grinding body (4) to form a pre-pressurized airflow environment; at the same time, the first motor (501), the second motor (505) and the third motor (507) of the drive component are started synchronously: the first motor (501) is driven by the first external magnet The magnetic coupling between the rotor (502) and the first inner magnetic rotor (27) drives the first crushing roller (26) of the upper crushing mechanism to rotate at high speed; the third motor (507) drives the second crushing roller (30) of the lower crushing mechanism to rotate synchronously through the magnetic coupling between the third outer magnetic rotor (508) and the third inner magnetic rotor (31); the second motor (505) drives the center roller (28) of the center guiding component to rotate through the magnetic coupling between the second outer magnetic rotor (506) and the second inner magnetic rotor (29), and the center roller (28) guides the input small pieces of material to be evenly distributed to the crushing areas of the first crushing roller (26) and the second crushing roller (30) to achieve graded crushing and material guidance; S3. Powder Introducing Cavity: After the upper crushing mechanism and the lower crushing mechanism have been running for a preset time, manually or by driving the unloading mechanism's pull plate (8) is pulled out, so that the powdered material generated by the first crushing roller (26) falls through the gap between the inclined guide plates (7) on the inner wall of the grinding body (4), and falls into the wall cavity of the grinding body (4) through the feeding trough (10) at the lower end of the fixed frame (9). At the same time, some powder material accumulates in the upper space of the discharge cylinder (34), which is connected to the wall cavity of the grinding body (4). After the powder material is introduced, the pull plate (8) is pushed back into the inner wall of the inlet, and the lower channel of the grinding body (4) is resealed. S4, Pressure Air Conveying and Secondary Grinding: The third cylinder (36) is controlled by the PLC controller to drive the lifting column (37) to move upward along the inner wall of the discharge cylinder (34), so that the lifting column (37) releases the blockage of the air inlet on the discharge cylinder (34); the dry compressed air continuously output by the first air pump (503) enters the discharge cylinder (34) and the wall cavity through the air inlet, forming an upward strong airflow, which blows the powdered material accumulated in the cavity upward; under the push of the pressure air, the powdered material passes through multiple through holes (12) on the separation plate (11) of the interception mechanism, and enters the second groove (18) in the middle of the inner wall of the wall cavity of the return grinding body (4) under the guidance of the airflow, and finally flows into the crushing area of ​​the second crushing roller (30) of the lower crushing mechanism through the second groove (18), and the powdered material is subjected to secondary grinding and crushing by the continuously rotating second crushing roller (30) to refine the particle size of the material; S5. Hot air assistance and internal circulation: Start the second air pump (504) of the air filling component to continuously supply air into the ventilation body (6), and at the same time turn on the air heating block (602) of the heating mechanism to heat the air in the ventilation body (6) to 50-80°C; The heated hot air is injected into the wall cavity of the grinding body (4) through the second air inlet channel (604) and the first air inlet channel (603) of the air inlet mechanism to further enhance the air pressure in the cavity, improve the fluidity of the powder material, and assist in pressing the powder attached to the inner wall of the cavity into the second trough (18); During this process, some powder with smaller particle size moves upward along the wall cavity to the third trough (32) under the action of strong air pressure, and falls back to the crushing area of ​​the first crushing roller (26) of the upper crushing mechanism under the guidance of the guide plate (33) on the inner wall of the third trough (32), so as to realize the internal circulation crushing of the material and ensure the uniformity of crushing; S6. Finished product sorting and material circulation: After the secondary grinding is completed, the fourth cylinder (39) of the blocking mechanism is opened by the PLC controller, driving the sealing block (40) to rise along the inner wall of the fourth tank (42) and opening the discharge channel (41); under the action of the airflow in the cavity, a portion of the target powder material that reaches the preset particle size range is discharged through the discharge channel (41) and enters the subsequent collection device; another portion of the powder material that does not reach the target particle size falls back into the jaw crusher (2) through the discharge end of the discharge channel (41) under the combined action of airflow and gravity, and re-participates in the primary crushing cycle to achieve closed-loop processing of materials; S7. Online cleaning and final evacuation: During the crushing process or interval, the deposited powder removal mechanism is activated for online cleaning: the compressed air output by the second air pump (504) is diverted through the air inlet box (24) and sprayed into the bottom of the grinding body (4) through the air inlet cylinder (25) in multiple air inlet holes (23). At the same time, the second cylinder (22) drives the stop block (21) to slide up and down on the inner wall of the V-shaped block (20) to disturb the powder deposited at the bottom of the grinding body (4), prevent the material from agglomerating and blow it up to re-enter the cycle. When the crushing process is completely finished, the third cylinder (36) is controlled by the PLC controller to drive the lifting column (37) to move down again to close the lower end of the discharge cylinder (34). The extraction plate (8) is pulled out so that the material remaining in the cavity of the grinding body (4), the discharge cylinder (34) and the bottom of the device is guided by the inclined guide plate (7) under the action of gravity and completely discharged from the system through the discharge chute (10) to complete the equipment cleaning.

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