A powder grinding mill

Abstract

This utility model relates to the field of grinding equipment technology and is a powder grinding machine, including a grinding box with a lower grinding disc inside. An upper grinding disc is fitted onto the lower grinding disc. The grinding box includes a box body and a box cover. A conical receiving hopper is connected to the bottom of the box body. A rotating ring is provided between the receiving hopper and the box body. A rack is fixed on the outer ring surface of the rotating ring, and the rack meshes with a gear. The gear is connected to a stepper motor. The lower grinding disc is fixedly connected to the rotating ring by multiple fixing rods. The upper grinding disc is connected to the box cover by fixing rods. A feeding channel is provided on the upper grinding disc. The box cover and the box body are connected by multiple vertical telescopic rods. The distance between the upper and lower grinding discs of this utility model can be flexibly adjusted, making it suitable for grinding materials of different particle sizes, improving the utilization rate of the equipment, and facilitating the cleaning of the upper and lower grinding discs; it also helps to improve product quality.

Description

Technical Field

[0001] This utility model belongs to the field of grinding equipment technology, and specifically relates to a powder grinding machine. Background Technology

[0002] In the production of carbon electrodes, the raw material includes coal tar pitch. Coal tar pitch requires grinding during use; it is poured into a grinder, ground, and then sieved. The sieved pitch powder is collected and then proceeds to the next mixing step. Existing grinders suffer from inconvenient distance adjustment between the upper and lower grinding discs, hindering cleaning of both discs. Furthermore, they are limited in their ability to grind coal tar pitch particles of different sizes, which is detrimental to subsequent production. Therefore, a powder grinding mill is urgently needed to solve these technical problems. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a powder grinding machine, including a grinding box. The grinding box contains a lower grinding disc, which is fitted with an upper grinding disc. The grinding box includes a box body and a box cover. A conical receiving hopper is connected to the bottom of the box body, and a discharge pipe is provided at the bottom of the receiving hopper. A rotating ring is provided between the receiving hopper and the box body. The upper end face of the rotating ring is rotatably connected to the box body via a bearing, and the lower end face of the rotating ring is rotatably connected to the receiving hopper via a bearing. A rack is fixed to the outer ring surface of the rotating ring, and the rack meshes with a gear. The gear is connected to a stepper motor. The lower grinding disc is fixedly connected to the inner ring surface of the rotating ring via multiple fixing rods. A retaining ring is fixed to both the upper and lower surfaces of the rotating ring inside the box body. The retaining rings act as retainers to prevent the ground powder from penetrating and affecting the rotation of the rotating ring.

[0004] The upper grinding disc is connected to the box cover via a second fixing rod. The upper grinding disc has a feeding channel, and the upper end of the feeding channel is connected to a feeding hopper via a feeding pipe. Both the box cover and the box body have mating outer edges, connected by multiple vertical telescopic rods. These telescopic rods are evenly distributed circumferentially along the outer edges. The fixed end of each telescopic rod is fixedly connected to the outer wall of the receiving hopper via a fixing block. The telescopic end of each telescopic rod passes through the outer edge of the box body and is fixedly connected to the outer edge of the box cover. Each telescopic rod can be an electric push rod or a hydraulic cylinder.

[0005] It should be noted that the opening and closing of the lid and the box body can be controlled by extending and retracting the telescopic rod. When the telescopic rod retracts, the lid and the box body are locked together, the upper grinding disc and the lower grinding disc come into contact, and the stepper motor rotates, driving the lower grinding disc to rotate. At this time, the material enters the space between the upper and lower grinding discs through the feeding channel for grinding, and the ground powder enters the receiving hopper. The distance between the upper and lower grinding discs is adjustable, which facilitates the grinding of materials of different sizes and improves the utilization rate of the device.

[0006] Preferably, the upper grinding disc is provided with multiple scraper blades, which are evenly distributed along the circumference of the upper grinding disc. The lower surface of the upper grinding disc is provided with multiple receiving grooves that match the scraper blades. The upper grinding disc is provided with multiple vertical telescopic rods, each corresponding to a scraper blade. The fixed end of the telescopic rod is fixed to the upper surface of the upper grinding disc, and the telescopic end extends into the receiving groove and is fixedly connected to the corresponding scraper blade. The telescopic rod is an electric push rod, a hydraulic cylinder, or a pneumatic cylinder. By extending the telescopic rod, the scraper blade can extend out of the receiving groove. When the scraper blade is in the receiving groove, it does not affect the grinding of the material by the upper and lower grinding discs. When the scraper blade extends out of the receiving groove, the grinding surface of the upper grinding disc does not contact the grinding surface of the lower grinding disc, and the scraper blade contacts the lower grinding disc. The lower grinding disc rotates, and the scraper blade scrapes the material off the lower grinding disc. The grinding surface of the lower grinding disc is conical, which facilitates the scraped material falling into the receiving hopper.

[0007] Preferably, the lower grinding disc has a raised limiting post at its center, and the lower surface of the upper grinding disc has a limiting groove at its center that matches the limiting post. The cooperation between the limiting post and the limiting groove makes the grinding process between the upper and lower grinding discs more precise and efficient.

[0008] Preferably, the discharge pipe is connected to a screening box, the bottom of which has a fine material outlet and the middle of which has a coarse material outlet. The coarse material outlet is connected to a guide pipe, which is equipped with a feeding pump. The other end of the guide pipe is connected to the feed pipe. This arrangement allows for screening of the ground material. Qualified material is discharged from the fine material outlet to the next process, while unqualified material is discharged from the coarse material outlet and enters the guide pipe, where it is re-entered into the feed pipe for grinding under the action of the feeding pump. This avoids over-grinding and under-grinding, resulting in more efficient and precise grinding, which improves the quality of subsequent production.

[0009] Preferably, the screening box includes a screw feeder and a second receiving hopper. The second receiving hopper is connected to the bottom casing of the screw feeder. The discharge pipe is connected to the feed inlet of the screw feeder, and the discharge outlet of the screw feeder is connected to the guide pipe. The bottom casing of the screw feeder is covered with filter holes, which are located on the casing inside the second receiving hopper. The bottom of the second receiving hopper has a discharge outlet with a switch valve. After the powder enters the screw feeder from the discharge pipe, the feeding motor of the screw feeder drives the feeding screw to rotate, and the powder is transported by the screw feeder towards the discharge outlet. During the transportation process, smaller powder particles pass through the filter holes into the second receiving hopper, while larger powder particles enter the guide pipe from the discharge outlet. Under the action of the feeding pump, they re-enter between the upper and lower grinding discs through the feed pipe for further grinding until they pass through the filter holes into the second receiving hopper. This design avoids over-grinding and under-grinding, making the grinding effect more efficient and precise, which is beneficial to improving the quality of subsequent production.

[0010] This utility model also includes other components that enable the normal operation of a powder grinding mill, such as a control component for controlling the powder to enter the feed pipe from the air duct (control component for the feed pump), a control component for the stepper motor, a control component for the feed motor, a control component for the valve, a control component for the first telescopic rod, a control component for the second telescopic rod, and a control component for the screw feeder, all of which are conventional technologies in the field. Furthermore, devices or components not limited in this utility model, such as screw feeders, electric push rods, cylinders, feed pumps, hydraulic cylinders, and scrapers, all employ conventional technologies and equipment in the field.

[0011] Working principle: The opening and closing of the chamber lid and body can be controlled by extending and retracting the telescopic rod. When the telescopic rod retracts, the lid and body are locked together, the upper and lower grinding discs come into contact, and the stepper motor rotates, driving the lower grinding disc to rotate. At this time, the material enters the space between the upper and lower grinding discs through the feeding channel for grinding. The ground powder enters the receiving hopper. The distance between the upper and lower grinding discs is adjustable, which facilitates grinding materials of different sizes and improves the utilization rate of the device.

[0012] After grinding for a period of time, the extension rod 2 extends, causing the scraper to extend from the receiving groove. The grinding surface of the upper grinding disc does not contact the grinding surface of the lower grinding disc, while the scraper contacts the lower grinding disc. The lower grinding disc rotates, and the scraper scrapes the material off the lower grinding disc. The scraped material falls into the receiving hopper 1. The material in the receiving hopper 1 enters the screening box through the discharge pipe for screening. The qualified material is discharged from the fine material outlet and enters the next process. The unqualified material is discharged from the coarse material outlet and enters the guide pipe. Under the action of the feeding pump, it re-enters the feeding pipe for grinding, avoiding over-grinding and under-grinding, making the grinding effect more efficient and precise, which is conducive to improving the quality of subsequent production.

[0013] This invention has the following advantages: the distance between the upper and lower grinding discs can be flexibly adjusted, making it suitable for grinding materials of different particle sizes, thus improving the utilization rate of the equipment and facilitating the cleaning of the upper and lower grinding discs; it allows for scraping the material from the lower grinding disc, preventing the powder from sticking to it; and it enables timely sieving of the ground material, preventing over-grinding or unqualified grinding, which helps improve product quality. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of a powder grinding machine according to Embodiment 1 of this utility model;

[0016] Figure 2 for Figure 1 Top view of the middle box;

[0017] Figure 3 for Figure 1 Diagram showing the state of the scraper plate extending to scrape the lower grinding disc;

[0018] Figure 4 This is a schematic diagram of the structure of a powder grinding machine according to Embodiment 2 of this utility model;

[0019] Figure 5 for Figure 4 A diagram showing the state of the upper and lower grinding discs when they are in contact.

[0020] Figure 6 for Figure 5 Diagram showing the state of the scraper plate extending to scrape the lower grinding disc;

[0021] Figure 7 This is a schematic diagram of the structure of a powder grinding machine according to Embodiment 3 of this utility model;

[0022] Figure 8 for Figure 7 Sectional view at point AA.

[0023] In the diagram: 1. Box body; 2. Box cover; 3. Lower grinding disc; 4. Upper grinding disc; 5. Discharge pipe; 6. Limiting post; 7. Limiting groove; 8. Fixed end of telescopic rod one; 9. Feed hopper; 10. Feed pipe; 11. Feed channel; 12. Scraper; 13. Telescopic rod two; 14. Fixed rod one; 15. Rotating ring; 16. Rack; 17. Gear; 18. Stepper motor; 19. Fixing block; 20. Telescopic end of telescopic rod one; 21. Screening box; 22. Guide pipe; 23. Feed pump; 24. Fine material outlet; 25. Outer edge; 26. Retaining ring; 27. Fixed rod two; 28. Screw feeder; 29. ​​Receiving hopper two; 30. Feeding motor; 31. Feeding screw; 32. Filter hole. Detailed Implementation

[0024] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0025] Example 1

[0026] like Figure 1-3 As shown, this utility model provides a powder grinding machine, including a grinding box. A lower grinding disc 3 is provided inside the grinding box, and an upper grinding disc 4 is fitted to the lower grinding disc 3. The grinding box includes a box body 1 and a box cover 2. A conical receiving hopper is connected to the bottom of the box body 1, and a discharge pipe 5 is provided at the bottom of the receiving hopper. A rotating ring 15 is provided between the receiving hopper and the box body 1. The upper end face of the rotating ring 15 is rotatably connected to the box body 1 via a bearing, and the lower end face of the rotating ring 15 is connected via a bearing. Bearing 2 is rotatably connected to receiving hopper 1. A rack 16 is fixed on the outer ring surface of the rotating ring 15. The rack 16 meshes with a gear 17. The gear 17 is connected to a stepper motor 18. The lower grinding disc 3 is fixedly connected to the inner ring surface of the rotating ring 15 through multiple fixing rods 14. A retaining ring 26 is fixed on both the upper and lower surfaces of the rotating ring 15 located in the housing 1. The retaining ring 26 acts as a retainer for the ground powder, preventing the powder from penetrating and affecting the rotation of the rotating ring 15.

[0027] The upper grinding disc 4 is connected to the box cover 2 via a fixing rod 27. The upper grinding disc 4 has a feeding channel 11, the upper end of which is connected to a feeding hopper 9 via a feeding pipe 10. Both the box cover 2 and the box body 1 have mutually cooperating outer edges 25, connected by multiple vertical telescopic rods. These telescopic rods are evenly distributed along the circumference of the outer edges 25. The fixed end 8 of each telescopic rod is fixedly connected to the outer wall of the receiving hopper via a fixing block 19. The telescopic end 20 of each telescopic rod passes through the outer edge 25 of the box body 1 and is fixedly connected to the outer edge 25 of the box cover 2. The telescopic rod is either an electric push rod or a hydraulic cylinder.

[0028] The opening and closing of the cover 2 and the body 1 can be controlled by extending and retracting the telescopic rod. When the telescopic rod retracts, the cover 2 and the body 1 are locked together, the upper grinding disc 4 and the lower grinding disc 3 come into contact, and the stepper motor 18 rotates, driving the lower grinding disc 3 to rotate. At this time, the material enters the space between the upper and lower grinding discs 3 through the feeding channel 11 for grinding, and the ground powder enters the receiving hopper 1. This setting allows the distance between the upper and lower grinding discs 3 to be adjusted, which is convenient for grinding materials of different sizes and improves the utilization rate of the device.

[0029] The upper grinding disc 4 is provided with a plurality of scraper plates 12, which are evenly distributed along the circumference of the upper grinding disc 4. The lower surface of the upper grinding disc 4 is provided with a plurality of receiving grooves that match the scraper plates 12. The upper grinding disc 4 is provided with a plurality of vertical telescopic rods 13, which correspond one-to-one with the scraper plates 12. The fixed end of the telescopic rod 13 is fixed to the upper surface of the upper grinding disc 4, and the telescopic end of the telescopic rod 13 extends into the receiving groove and is fixedly connected to the corresponding scraper plate 12. The telescopic rod 13 is an electric push rod, a hydraulic cylinder, or a pneumatic cylinder. The extension of the telescopic rod 13 allows the scraper 12 to extend out of the receiving groove. When the scraper 12 is in the receiving groove, it does not affect the grinding of the material by the upper grinding disc 4 and the lower grinding disc 3. When the scraper 12 extends out of the receiving groove, the grinding surface of the upper grinding disc 4 does not contact the grinding surface of the lower grinding disc 3. The scraper 12 contacts the lower grinding disc 3, the lower grinding disc 3 rotates, and the scraper 12 scrapes the material off the lower grinding disc 3. The grinding surface of the lower grinding disc 3 is a conical surface, which is conducive to the scraped material falling into the receiving hopper.

[0030] The lower grinding disc 3 has a raised limiting post 6 at its center, and the lower surface of the upper grinding disc 4 has a limiting groove 7 that matches the limiting post 6 at its center. The cooperation between the limiting post 6 and the limiting groove 7 makes the grinding of the upper grinding disc 4 and the lower grinding disc 3 more precise and efficient.

[0031] During operation, the opening and closing of the cover 2 and the body 1 can be controlled by extending and retracting the telescopic rod. When the telescopic rod retracts, the cover 2 and the body 1 are locked together, the upper grinding disc 4 and the lower grinding disc 3 come into contact, and the stepper motor 18 rotates, driving the lower grinding disc 3 to rotate. At this time, the material enters the space between the upper and lower grinding discs 3 through the feeding channel 11 for grinding, and the ground powder enters the receiving hopper 1. This setting allows the distance between the upper and lower grinding discs 3 to be adjustable, facilitating the grinding of materials of different sizes and improving the utilization rate of the device.

[0032] After grinding for a period of time, the telescopic rod 13 extends, causing the scraper 12 to extend out of the receiving groove. The grinding surface of the upper grinding disc 4 does not contact the grinding surface of the lower grinding disc 3. The scraper 12 contacts the lower grinding disc 3. The lower grinding disc 3 rotates, and the scraper 12 scrapes the material off the lower grinding disc 3. The scraped material falls into the receiving hopper.

[0033] Example 2

[0034] like Figure 4-6 As shown, the difference between this embodiment and Embodiment 1 is that the discharge pipe 5 is connected to a screening box 21. The bottom of the screening box 21 has a fine material outlet 24, and the middle of the screening box 21 has a coarse material outlet. The coarse material outlet is connected to a guide pipe 22, and the guide pipe 22 is equipped with a feeding pump 23, which can be an air pump. The other end of the guide pipe 22 is connected to the feed pipe 10. This setup can screen the ground material. The qualified material is discharged from the fine material outlet 24 and enters the next process, while the unqualified material is discharged from the coarse material outlet and enters the guide pipe 22. Under the action of the feeding pump 23, it re-enters the feed pipe 10 for grinding, avoiding over-grinding and under-grinding, making the grinding effect more efficient and precise, and improving the quality of subsequent production.

[0035] During operation, the opening and closing of the cover 2 and the body 1 can be controlled by extending and retracting the telescopic rod. When the telescopic rod retracts, the cover 2 and the body 1 are locked together, the upper grinding disc 4 and the lower grinding disc 3 come into contact, and the stepper motor 18 rotates, driving the lower grinding disc 3 to rotate. At this time, the material enters the space between the upper and lower grinding discs 3 through the feeding channel 11 for grinding, and the ground powder enters the receiving hopper 1. This setting allows the distance between the upper and lower grinding discs 3 to be adjustable, facilitating the grinding of materials of different sizes and improving the utilization rate of the device.

[0036] After grinding for a period of time, the telescopic rod 13 extends, causing the scraper 12 to extend out of the receiving groove. The grinding surface of the upper grinding disc 4 does not contact the grinding surface of the lower grinding disc 3, while the scraper 12 contacts the lower grinding disc 3. The lower grinding disc 3 rotates, and the scraper 12 scrapes the material off the lower grinding disc 3. The scraped material falls into the receiving hopper 1. The material in the receiving hopper 1 enters the screening box 21 through the discharge pipe 5 for screening. The qualified material is discharged from the fine material outlet 24 and enters the next process. The unqualified material is discharged from the coarse material outlet and enters the guide pipe 22. Under the action of the feeding pump 23, it re-enters the feed pipe 10 for grinding, avoiding over-grinding and under-grinding, making the grinding effect more efficient and precise, which is conducive to improving the quality of subsequent production.

[0037] Example 3

[0038] like Figure 7-8As shown, the difference between this embodiment and embodiment 1 is that the discharge pipe 5 is connected to a screening box 21, the screening box 21 includes a screw feeder 28 and a receiving hopper 29, the receiving hopper 29 is connected to the bottom casing of the screw feeder 28, the discharge pipe 5 is connected to the inlet of the screw feeder 28, the outlet of the screw feeder 28 is connected to the guide pipe 22, the bottom casing of the screw feeder 28 is covered with filter holes 32, the filter holes 32 are located on the casing inside the receiving hopper 29, and the bottom of the receiving hopper 29 is provided with a discharge port with a switch valve. After the powder enters the screw feeder 28 through the discharge pipe 5, the feeding motor 30 of the screw feeder 28 drives the feeding screw 31 to rotate, and the powder is transported by the screw feeder 28 towards the discharge port. During the transportation process, smaller powder particles enter the receiving hopper 29 through the filter holes 32, while larger powder particles enter the guide pipe 22 from the discharge port. Under the action of the feeding pump 23, they enter the space between the upper grinding disc 4 and the lower grinding disc 3 through the feed pipe 10 for further grinding until they pass through the filter holes 32 and enter the receiving hopper 29. This setting avoids over-grinding and under-grinding, making the grinding effect more efficient and precise, which is beneficial to improving the quality of subsequent production.

[0039] The stepper motor, feeding motor, feeding pump, feeding screw, electric push rod, cylinder, hydraulic cylinder, and switching valve involved in the above embodiments 1, 2, and 3 are all existing technologies. This application does not make any improvements to them, but only utilizes their existing functions. For their specific structure and principle, please refer to the product manual or existing technical data, which are all existing technologies.

[0040] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A powder grinder comprising a grinding box, a lower grinding disc is arranged in the grinding box, and an upper grinding disc is matched with the lower grinding disc, characterized in that: The grinding box includes a box body and a box cover. A conical receiving hopper is connected to the bottom of the box body. A discharge pipe is provided at the bottom of the receiving hopper. A rotating ring is provided between the receiving hopper and the box body. The upper end face of the rotating ring is rotatably connected to the box body through a bearing. The lower end face of the rotating ring is rotatably connected to the receiving hopper through a bearing. A rack is fixed on the outer ring surface of the rotating ring. The rack meshes with a gear. The gear is connected to a stepper motor. The lower grinding disc is fixedly connected to the inner ring surface of the rotating ring through multiple fixing rods. The upper grinding disc is connected to the box cover via a fixing rod 2. The upper grinding disc is provided with a feeding channel. The upper end of the feeding channel is connected to a feeding hopper via a feeding pipe. The box cover and the box body are provided with mutually cooperating outer edges. The two outer edges are connected by multiple vertical telescopic rods 1. The multiple telescopic rods 1 are evenly distributed along the circumference of the outer edge. The fixed end of the telescopic rod 1 is fixedly connected to the outer wall of the receiving hopper 1 via a fixing block. The telescopic end of the telescopic rod 1 passes through the outer edge of the box body and is fixedly connected to the outer edge of the box cover.

2. The powder grinding mill according to claim 1, characterized in that: The upper grinding disc is provided with multiple scraper blades, which are evenly distributed along the circumference of the upper grinding disc. The lower surface of the upper grinding disc is provided with multiple receiving grooves that match the scraper blades. The upper grinding disc is provided with multiple vertical telescopic rods, which correspond one-to-one with the scraper blades. The fixed end of the telescopic rod is fixed to the upper surface of the upper grinding disc, and the telescopic end of the telescopic rod extends into the receiving groove and is fixedly connected to the corresponding scraper blade.

3. The powder grinding mill according to claim 1, characterized in that: The lower grinding disc has a raised limiting post at its center, and the lower surface of the upper grinding disc has a limiting groove at its center that matches the limiting post.

4. A powder grinding mill according to claim 1, characterized in that: The discharge pipe is connected to a screening box. The bottom of the screening box is provided with a fine material outlet, and the middle of the screening box is provided with a coarse material outlet. The coarse material outlet is connected to a guide pipe, and a feeding pump is provided on the guide pipe. The other end of the guide pipe is connected to the feed pipe.

5. A powder grinding mill according to claim 4, characterized in that: The screening box includes a screw feeder and a receiving hopper 2. The receiving hopper 2 is connected to the bottom casing of the screw feeder. The discharge pipe is connected to the feed inlet of the screw feeder. The discharge outlet of the screw feeder is connected to the guide pipe. The bottom casing of the screw feeder is covered with filter holes, which are located on the casing inside the receiving hopper 2.

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