Carbon powder grinding device for printing machine

Abstract

According to the carbon powder grinding device for the printing machine, a plurality of grinding wheels capable of performing circular motion are arranged above a grinding disc, so that when the grinding disc drives materials to rotate, the grinding wheels can be rubbed, and the grinding wheels perform circular rotation in the autorotation process; therefore, when the material is ground by the first grinding wheel and then enters the space between the next grinding wheel and the first grinding wheel, the next grinding wheel moves to the position; the distance between the grinding wheel and the grinding wheel is increased, so that materials in the distance are subjected to secondary grinding (the contact time of the materials in the distance and the next grinding wheel is shortened through the opposite movement of the grinding disc and the grinding wheel), other materials passing through the distance are subjected to primary grinding, and the grinding efficiency is improved on the premise that the number of the grinding wheels is not increased.

Description

Technical Field

[0001] This application relates to the field of toner preparation technology, and in particular to a toner grinding device for printing presses. Background Technology

[0002] Toner is the main raw material for effective printing in printing presses. The particle size of toner is required to be between 5 and 8 micrometers. When preparing toner particles that meet the requirements, a vertical grinder is generally used for grinding. Large raw materials are put into the center of the grinding disc of the vertical grinder. The gearbox drives the grinding disc to rotate. The grinding disc, rotating at 0-80 rpm, uses centrifugal force to move the raw materials to the outside of the grinding disc. At this time, the circumferentially distributed grinding rollers on the grinding disc are affected by the friction of the raw materials driven by the grinding disc and rotate on their own position without changing position. This makes the grinding rollers crush and grind the toner. The ground raw materials will continue to move to the outside of the grinding disc under the action of centrifugal force. At this time, the air ring formed between the outside of the grinding disc and the inner wall of the grinder continuously sprays air upward, blowing the small particles that fall from the grinding disc upward to the separator above. The qualified materials are discharged, and the large particles will fall back onto the grinding disc for grinding. Meanwhile, the materials that cannot be blown up by the airflow will fall into the collection tank below and be transported back for re-grinding.

[0003] In this grinding process, since the position of the grinding rollers is fixed and the grinding disc rotates continuously, the gap between one grinding roller and the next will cause a large amount of ungrinded material to leave the grinding disc through this gap. Therefore, more grinding rollers need to be added to reduce this gap, thereby reducing the amount of material that leaves through this gap and cannot be ground. However, this method will compress the space between the grinding rollers, resulting in uneven material distribution, obstructed movement, and other adverse effects, making it difficult for the material to be fully ground. Summary of the Invention

[0004] This application proposes a toner grinding device for printing presses, which features a grinding wheel that rotates on its own axis while simultaneously undergoing circumferential motion. The circumferentially moving grinding wheel rapidly grinds the material, while a bucket follows the rotation of the grinding wheel to scoop up the material and feed it into a funnel-shaped hole. An airflow blows the material in the funnel-shaped hole and throws it onto a transfer tarpaulin. The material on the transfer tarpaulin is graded, decelerated, and falls back onto the grinding disc. The transfer tarpaulin is impacted and vibrates, causing the wear-resistant cloth to shake. The shaking of the wear-resistant cloth allows the material to enter the grinding ring in layers. This device solves the problems of poor grinding efficiency of materials within the distance between adjacent grinding rollers and low grinding efficiency caused by material accumulation on the grinding disc in existing vertical grinding machines.

[0005] To achieve the above objectives, this application adopts the following technical solution: a toner grinding device for a printing press, comprising a grinding disc and a grinding device above it, wherein a grinding ring channel is provided on the outer side of the top of the grinding disc to provide grinding space; the grinding device includes a support platform above the grinding disc and grinding wheels evenly distributed above the grinding ring channel for grinding the material in the grinding ring channel; a movable ring groove is provided at the bottom end of the support platform, and roller grooves are respectively provided on both sides of the groove opening of the movable ring groove; a through-hole is provided in the center of the grinding wheel, a cross support rod is provided on the inner side wall of the hole, a central shaft is provided in the center of the cross support rod, and guide wheels are respectively provided at both ends of the central shaft to the two roller grooves to limit the movement direction of the grinding wheel.

[0006] Preferably, the bottom end of the roller groove is provided with evenly distributed discharge holes, and the side wall of the movable ring groove near the center of the support platform is provided with a through discharge hole for discharging the material and airflow entering the movable ring groove. The top end of the support platform is provided with an inclined surface, which is inclined downward from the outside to the inside, for guiding the material falling from above back onto the grinding disc.

[0007] Preferably, a loading ring is provided at one end of the grinding wheel near the outer side of the grinding disc, and evenly distributed digging buckets are provided on the circumferential surface of the loading ring. The digging buckets are arc-shaped, and the outer opening of the digging buckets is tangent to the rotation direction of the grinding wheel, so as to dig out the material below during the rotation.

[0008] Preferably, the bucket has a material guide groove, and the opening of the inner end of the bucket near the loading ring faces the horn hole, which is used to guide the material dug by the bucket into the horn hole.

[0009] Preferably, the horn hole is shaped like a horn with one end larger than the other in the axial direction, and the opening at the end of the horn hole near the loading ring is smaller than the opening at the other end, which is used to guide the material back onto the grinding disc.

[0010] Preferably, an annular transfer tarpaulin is provided above the grinding disc. The inner and outer rings of the transfer tarpaulin are respectively provided with fixing ring rods. The outer fixing ring rod is provided with circumferentially distributed L-shaped fixing plates, and the inner fixing ring rod is provided with a vibrating rod. The bottom of the L-shaped fixing plate is connected to the top of the grinding disc to drive the transfer tarpaulin to rotate with the grinding disc.

[0011] Preferably, the transfer tarpaulin is inclined downwards from the outside to the inside, with an inclination angle of no more than 70 degrees, to guide the material on the transfer tarpaulin to roll back onto the grinding disc. The outer side of the transfer tarpaulin is close to the large-diameter opening of the horn hole, and the outer side of the transfer tarpaulin is lower than the lowest position of the opening of the horn hole, to receive the material rolling down from the horn hole.

[0012] Preferably, a circumferential air guide zone is provided on the outer side of the bottom end of the support platform. The cross-section of the air guide zone is arc-shaped. The end of the air guide zone away from the grinding disc is at a low position, and the end closer to the grinding disc is at a high position, which is used to guide the airflow into the horn hole and onto the grinding disc.

[0013] Preferably, the top of the grinding disc is provided with a recessed annular groove, the recessed annular groove is annular, and a wear-resistant cloth is provided at the top opening of the recessed annular groove. The bottom end of the vibrating rod is connected to the center of the top of the wear-resistant cloth, which is used to obtain the vibration force of the transfer tarpaulin to drive the material on the wear-resistant cloth to jump.

[0014] This application provides a toner grinding device for printing presses. By arranging multiple grinding wheels that can rotate in a circular motion above a grinding disc, the grinding disc can rub against the grinding wheels as it rotates, causing the grinding wheels to rotate in a circular motion. This allows the material to be ground by the first grinding wheel and then move into the gap between the first and next grinding wheels, where the next grinding wheel will move towards this position, thus performing secondary grinding on the material within this gap (the contact time between the material and the next grinding wheel in this gap is shortened by the opposing movement of the grinding disc and the grinding wheels). The device also performs primary grinding on other materials passing through this gap, thereby improving grinding efficiency without increasing the number of grinding wheels.

[0015] Meanwhile, by setting evenly distributed buckets on the side of the grinding wheel near the outer side of the grinding disc, the buckets that rotate to the lower position can dig up the material outside the grinding ring when the grinding wheel rotates. As the buckets gradually rotate to the highest position, they fall into the funnel hole along the guide groove and then fall back to the other side of the grinding ring for secondary grinding, thus improving the grinding effect.

[0016] Meanwhile, by fitting the outer wall of the support platform against the inner wall of the grinder, and setting an air guide zone above the air ring (the distance between the outer wall of the grinding disc and the inner wall of the grinder), the airflow blowing upward through the air ring is guided by the air guide zone to the horn hole and above the grinding disc. This allows the material rolling down in the horn hole to be accelerated by the airflow. Small particles will follow the airflow upward after passing through the horn hole, while larger particles of different sizes that cannot be carried away will be ejected from the horn hole under the acceleration of the airflow, landing on different points on the transfer tarpaulin and then rolling onto the wear-resistant cloth. At this time, due to the centrifugal force, the material on the transfer tarpaulin has a force towards the grinding wheel, which slows down the speed at which the material on the transfer tarpaulin rolls onto the wear-resistant cloth. This prevents a large amount of backflow material from falling onto the grinding disc in a short time, causing a surge in material on the grinding disc, resulting in a large accumulation of material in the grinding ring channel, hindering flow, and affecting the effective grinding of the grinding wheel.

[0017] Meanwhile, the material continuously thrown onto the transfer tarpaulin will cause the tarpaulin to be subjected to impact force, resulting in continuous shaking. At this time, the shaking of the transfer tarpaulin will be transmitted to the wear-resistant cloth through the vibrating rod, causing the wear-resistant cloth to shake continuously. This causes the material of different volumes on the wear-resistant cloth to stratify under continuous shaking. Under centrifugal force, the larger volume material will reach the grinding ring before the smaller volume material, and then be ground and crushed. After that, the smaller volume material will enter the grinding ring again for grinding and crushing, thereby improving the flowability of the material, reducing the amount of material that the grinding wheel contacts per unit time, and improving the grinding effect. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the support platform structure of the present invention; Figure 4 This is a schematic diagram of the grinding disc structure of the present invention; Figure 5 This is a schematic diagram of the grinding wheel structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the grinding wheel of the present invention; Figure 7 This is a schematic diagram of the bucket structure of the present invention.

[0020] The components are: 1. Grinding disc; 2. Grinding ring track; 3. Recessed ring groove; 4. Wear-resistant cloth; 5. Support platform; 6. Movable ring groove; 7. Air guide zone; 8. Roller groove; 9. Discharge hole; 10. Discharge hole; 11. Grinding wheel; 12. Horn hole; 13. Central shaft; 14. Cross support rod; 15. Guide wheel; 16. Loading ring; 17. Bucket; 18. Guide chute; 19. Transfer tarpaulin; 20. Fixed ring rod; 21. L-shaped fixed plate; 22. Vibrating rod. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example

[0022] Please see Figures 1 to 4 A toner grinding device for a printing press includes a grinding disc 1. A grinding ring channel 2 is formed on the outer side of the top of the grinding disc 1. Both sides of the grinding ring channel 2 have arc-shaped surfaces, allowing material to smoothly enter and exit the grinding ring channel 2 for grinding, preventing material blockage. An annular support platform 5 is positioned above the grinding disc 1. The support platform 5 is bolted to the inner wall of the grinder, fixing its position and causing the upward-blowing airflow to be redirected towards the grinding disc 1. This increased airflow agitates the material on the grinding disc 1, carrying away small particles near the outer edge, particularly a large amount of small particles within the grinding ring channel 2, preventing the accumulation of already ground material. The material remains in the grinding ring 2 for a long time, forming a material layer and creating a buffer. This buffer reduces the grinding efficiency when large particles are squeezed. The bottom of the support platform 5 has a movable ring groove 6, and roller grooves 8 are respectively opened on both sides of the groove opening of the movable ring groove 6. The bottom of the roller groove 8 has evenly distributed discharge holes 9, so that the material falling into the roller groove 8 can be discharged through the discharge holes 9. A through discharge hole 10 is opened on the side wall of the movable ring groove 6 near the center of the support platform 5, so that the material entering the movable ring groove 6 can be discharged through the discharge hole 10 under the action of airflow. The top of the support platform 5 has an inclined surface, which is inclined from the outside to the inside and downward, so that the material falling from above can roll back onto the grinding disc 1 below after landing on the support platform 5.

[0023] See Figures 1 to 2 , Figures 5 to 6 The grinding ring 2 is provided with circumferentially distributed grinding wheels 11, so that the rotating grinding disc 1 can contact the grinding wheels 11 through the material in the grinding ring 2, causing the grinding wheels 11 to crush the material in the grinding ring 2 to grind the material. In this process, the grinding wheels 11 will rotate due to the friction of the material (see the attached instruction manual). Figure 2 For example, when the grinding disc 1 rotates clockwise, the grinding wheel 11 will rotate clockwise. A through-hole 12 is provided at the center of the grinding wheel 11. A cross support rod 14 is welded to the inner wall of the horn hole 12. A central shaft 13 is fixedly sleeved at the center of the cross support rod 14. Guide wheels 15 are fixedly connected to both ends of the central shaft 13. The two guide wheels 15 are movably disposed within two roller grooves 8, allowing them to perform limited circular motion due to the constraint of the roller grooves 8. When the grinding wheel 11 rotates, it drives the guide wheels 15 to rotate synchronously through the cross support rod 14 and the central shaft 13. Because the guide wheels 15 have degrees of freedom, the grinding wheel 11 rotates forward while rotating (see attached instruction manual). Figure 2For example, when the grinding disc 1 rotates clockwise, the grinding wheel 11 will rotate counterclockwise. The guide wheel 15 will control the rotation direction of the grinding wheel 11, so that when the material enters the gap between the first grinding wheel 11 and the next grinding wheel 11 after being ground by the first grinding wheel 11, the next grinding wheel 11 will move to this position, thereby performing secondary grinding on the material in this gap (by shortening the contact time between the material in this gap and the next grinding wheel 11 through the opposite movement of the grinding disc 1 and the grinding wheel 11), and performing one grinding on other materials passing through this gap, thereby improving grinding efficiency without increasing the number of grinding wheels 11. Example

[0024] Please see Figures 1 to 2 , Figures 5 to 7 Based on Embodiment 1, a loading ring 16 is bolted to one end of the grinding wheel 11 near the outer side of the grinding disc 1. Digging buckets 17 are evenly distributed on the circumferential surface of the loading ring 16. A guide groove 18 is provided inside the digging bucket 17. The opening of the digging bucket 17 near the outer side of the loading ring 16 is close to the outer circumferential side of the grinding wheel 11, and the opening of the digging bucket 17 near the inner side of the loading ring 16 is directly opposite the horn hole 12. The digging bucket 17 and the guide groove 18 are arc-shaped. The outer opening of the digging bucket 17 is tangent to the rotation direction of the grinding wheel 11, so that when the grinding wheel 11 rotates, it can drive the digging bucket 17 to rotate synchronously. At this time, the bottom opening of the digging bucket 17 rotating from top to bottom will tangentially insert into the material outside the grinding ring channel 2, and dig the material into the guide groove 18 during the rotation from bottom to top. As the digging bucket 17 gradually rotates upward, the material in the guide groove 18 will roll downward into the horn hole 12 along with the guide groove 18.

[0025] See Figure 6 The horn hole 12 is horn-shaped with one end larger than the other in the axial direction. The opening of the horn hole 12 near the loading ring 16 is smaller than the opening of the other end, so that the material that rolls into the horn hole 12 can roll back down along the inclined surface of the horn hole 12 to the inside of the grinding ring 2, and can be processed again in the grinding ring 2 to improve grinding efficiency. Example

[0026] Please see Figure 2 , Figure 4Based on Embodiment 2, an annular transfer tarpaulin 19 is provided above the grinding disc 1. The inner and outer rings of the transfer tarpaulin 19 are respectively fixedly fitted with fixing ring rods 20, so that the two fixing ring rods 20 fix the shape of the transfer tarpaulin 19. An L-shaped fixing plate 21 evenly distributed around the circumference is fixedly connected to the outer fixing ring rod 20. The bottom of the L-shaped fixing plate 21 is fixedly connected to the top of the grinding disc 1 by bolts. A vibrating rod 22 is fixedly connected to the inner fixing ring rod 20. The transfer tarpaulin 19 slopes downwards from the outside to the inside, with an inclination angle not exceeding seventy degrees. The outer side of the transfer tarpaulin 19 is close to the... The large-diameter opening of the horn hole 12 and the outer position of the transfer tarpaulin 19 being lower than the lowest position of the opening of the horn hole 12 allow the material rolling down from the horn hole 12 to first land on the transfer tarpaulin 19. At this time, due to the presence of centrifugal force, the material on the transfer tarpaulin 19 has a force in the direction of the grinding wheel 11, which slows down the speed at which the material on the transfer tarpaulin 19 rolls down onto the grinding disc 1. This prevents a large amount of backflow material from falling onto the grinding disc 1 in a short time, which would cause a surge in the amount of material on the grinding disc 1 in a short time, resulting in a large accumulation of material in the grinding ring 2, making it difficult to flow and affecting the effective grinding of the grinding wheel 11.

[0027] See Figures 2 to 3 A circumferential air guide zone 7 is provided on the outer side of the bottom of the bearing platform 5. The cross-section of the air guide zone 7 is arc-shaped. The end of the air guide zone 7 away from the grinding disc 1 is at a low position, and the end closer to the grinding disc 1 is at a high position. This allows the upward airflow to be redirected by the air guide zone 7. A large amount of airflow will enter the funnel hole 12, and a portion of the airflow will enter the grinding disc 1. The large amount of airflow entering the funnel hole 12 will cause the material rolling down inside the funnel hole 12 to be accelerated by the airflow. Small particles of material will follow the airflow upward after passing through the funnel hole 12 and will not be carried away. Large particles of different sizes will be ejected from the horn hole under the acceleration of the airflow and land at different points on the transfer tarpaulin 19. At this time, due to the presence of centrifugal force, the material on the transfer tarpaulin 19 has a force in the direction of the grinding wheel 11, which slows down the speed at which the material of different sizes on the transfer tarpaulin 19 rolls onto the grinding disc 1. This prevents a large amount of backflow material from falling onto the grinding disc 1 in a short time, which would cause the material on the grinding disc 1 to increase dramatically in a short time. This would cause a large amount of material to accumulate in the grinding ring 2, making it difficult to flow and affecting the effective grinding of the grinding wheel 11. Example

[0028] Please see Figure 2 , Figure 4Based on Embodiment 3, a recessed annular groove 3 is provided at the top of the grinding disc 1. The recessed annular groove 3 is annular, and a wear-resistant cloth 4 is fixedly connected to the top opening of the recessed annular groove 3 by bolts. The bottom end of the vibrating rod 22 is fixedly connected to the top center of the wear-resistant cloth 4. The material continuously thrown onto the transfer tarpaulin 19 will cause the transfer tarpaulin 19 to be impacted and continuously shake. At this time, the shaking transfer tarpaulin 19 will transmit the shaking to the wear-resistant cloth 4 through the vibrating rod 22, causing the wear-resistant cloth 4 to continuously shake. As a result, the material of different volumes on the wear-resistant cloth 4 will stratify under continuous shaking. Under centrifugal force, the large volume material will reach the grinding ring 2 first and be ground and crushed. Then, the small volume material will enter the grinding ring 2 for grinding and crushing, thereby improving the fluidity of the material, reducing the amount of material contacted by the grinding wheel 11 per unit time, and improving the grinding effect.

Claims

1. A toner grinding device for a printing press, characterized in that, It includes a grinding disc (1) and a grinding device above it. A grinding ring channel (2) is provided on the outer side of the top of the grinding disc (1) to provide space for grinding. The grinding device includes a support platform (5) above the grinding disc (1) and grinding wheels (11) evenly distributed above the grinding ring channel (2), which are used to grind the material in the grinding ring channel (2). The bottom end of the support platform (5) is provided with a movable ring groove (6), and roller grooves (8) are provided on both sides of the groove opening of the movable ring groove (6). The grinding wheel (11) has a through-hole (12) at its center. A cross support rod (14) is provided on the inner side wall of the horn hole (12). A central shaft (13) is provided at the center of the cross support rod (14). Guide wheels (15) are provided at both ends of the central shaft (13) to the two roller grooves (8) to limit the movement direction of the grinding wheel (11).

2. The toner grinding device for a printing press according to claim 1, characterized in that, The bottom end of the roller groove (8) is provided with evenly distributed discharge holes (9). The side wall of the movable ring groove (6) near the center of the support platform (5) is provided with a through discharge hole (10) to discharge the material and airflow entering the movable ring groove (6). The top end of the support platform (5) is provided with an inclined surface. The inclined surface is inclined from the outside to the inside and downward to guide the material falling from above back to the grinding disc 1.

3. The toner grinding device for a printing press according to claim 1, characterized in that, The grinding wheel (11) is provided with a loading ring (16) at one end near the outer side of the grinding disc (1). The loading ring (16) is provided with evenly distributed digging buckets (17) on its circumferential surface. The digging buckets (17) are arc-shaped, and the outer opening of the digging buckets (17) is tangent to the rotation direction of the grinding wheel (11), which is used to dig out the material below during rotation.

4. The toner grinding device for a printing press according to claim 3, characterized in that, The bucket (17) is provided with a guide groove (18). The inner end of the bucket (17) near the loading ring (16) is open and faces the horn hole (12) to guide the material dug by the bucket (17) into the horn hole (12).

5. The toner grinding device for a printing press according to claim 4, characterized in that, The horn hole (12) is horn-shaped with one end larger than the other in the axial direction. The opening of the horn hole (12) near the loading ring (16) is smaller than the opening of the other end, which is used to guide the material back onto the grinding disc (1).

6. The toner grinding device for a printing press according to claim 5, characterized in that, A ring-shaped transfer tarpaulin (19) is provided above the grinding disc (1). The inner and outer rings of the transfer tarpaulin (19) are respectively provided with fixing ring rods (20). The outer fixing ring rod (20) is provided with L-shaped fixing plates (21) evenly distributed around the circumference, and the inner fixing ring rod (20) is provided with a vibrating rod (22). The bottom of the L-shaped fixing plate (21) is connected to the top of the grinding disc (1) to drive the transfer tarpaulin (19) to rotate with the grinding disc 1.

7. A toner grinding device for a printing press according to claim 6, characterized in that, The transfer tarpaulin (19) is inclined downward from the outside to the inside, with an inclination angle of no more than 70 degrees. It is used to guide the material on the transfer tarpaulin (19) to roll back onto the grinding disc (1). The outer side of the transfer tarpaulin (19) is close to the large-diameter opening of the horn hole (12), and the outer side of the transfer tarpaulin (19) is lower than the lowest position of the opening of the horn hole (12). It is used to receive the material rolling down from the horn hole (12).

8. A toner grinding device for a printing press according to claim 7, characterized in that, The bottom outer side of the support platform (5) is provided with a circumferential air guide area (7). The cross section of the air guide area (7) is arc-shaped. The end of the air guide area (7) away from the grinding disc (1) is in a low position, and the end close to the grinding disc (1) is in a high position. It is used to guide the airflow into the horn hole (12) and onto the grinding disc (1).

9. A toner grinding device for a printing press according to claim 8, characterized in that, The top of the grinding disc (1) is provided with an inner ring groove (3), which is ring-shaped. A wear-resistant cloth (4) is provided at the top opening of the inner ring groove (3). The bottom end of the vibrating rod (22) is connected to the top center of the wear-resistant cloth (4) to obtain the vibration force of the transfer tarpaulin (19) to drive the material on the wear-resistant cloth (4) to jump.

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