JP2020138124A - Pulverization bead supply device, bead mill and pulverization method - Google Patents

Abstract

To provide a pulverization bead supply device, a bead mill and a pulverization method that can reduce workload during pulverization with the bead mill and improve the quality of a target object.SOLUTION: A pulverization bead supply device for supplying pulverization beads to a bead mill includes: a hopper for storing the pulverization beads; a bead cup into which the pulverization beads are charged from the hopper; a blade for scraping out the pulverization beads charged into the bead cup and discharging the pulverization beads from a peripheral edge of the bead cup; and a motor for rotating the bead cup, the blade, or a combination of them. The blade is preferably not fixed to the bead cup or not integrated with the bead cup. The present invention also provides a method for pulverizing a target object, the method including a step of pulverizing the target object while continuously supplying a fixed quantity of pulverization beads to the bead mill.SELECTED DRAWING: Figure 2

Description

The present invention relates to a bead supply device for crushing, a bead mill and a crushing method.

Conventionally, a bead mill using a rotating rotor or the like has been used for pulverizing raw materials such as fillers, pigments, photosensitizers, electronic materials, carbon nanotubes, cells for various plants, metal powders, inorganic substances, and organic substances. Such a bead mill is a device in which an object to be crushed is passed through a mill filled with beads, and the object to be crushed is crushed by a shearing force when the beads, the inside of the mill, and the object to be crushed collide with each other.

In the above bead mill, a method is adopted in which a worker supplies a certain amount of beads in order to replenish the worn beads while checking the quality of the crushed product and the load (electric energy) on the bead mill. Conventionally, in order to simplify such manual work, the consumption of beads filled in the mill is detected, and each time the consumption reaches a certain amount, the beads are supplied to the mill at a preset time. Therefore, a technique for compensating for worn beads has been proposed (see Japanese Patent Application Laid-Open No. 3-86045).

Jikkenhei 3-86045

However, in the above-mentioned prior art, since the beads are transferred to the bead mill by compressed air and the supply amount of the beads is controlled by the valve, the beads are likely to be clogged during the transfer, and the beads bitten into the valve may be damaged. There is. Further, since the beads to be transferred are heavy objects, fine control is difficult, and when a trouble occurs, the restoration work becomes complicated and may take a lot of time.

Further, when beads are thrown in, the crushing load of the bead mill becomes temporarily large. During crushing, the beads wear and lose weight until the beads are added. Therefore, it is necessary to change the crushing load while checking the quality such as the average particle size and particle size distribution of the crushed product, and a certain amount. When the load is exceeded, beads are supplied, the weight loss due to wear is replenished, and a means for reducing the load while checking the quality is required. Therefore, there is a time lag between quality confirmation and load change, and quality may fluctuate during that time. Further, during the time lag, the beads are pulverized in a state where the beads are excessively supplied with respect to the pulverization load, so that the beads may be worn out. Furthermore, by manually supplying beads, especially in factories that manufacture crushed products in large quantities and in multiple stages, the number of mills to be managed and the types of beads increase, so the work load during crushing by the bead mill is excessive. May increase.

The present invention has been made based on the above circumstances, and an object of the present invention is a crushing bead supply device capable of reducing the work load at the time of crushing by a bead mill and improving the quality of the object to be crushed. , A bead mill and a grinding method.

The invention made to solve the above problems is a crushing bead supply device for supplying crushing beads to a bead mill, in which a hopper for storing the crushing beads and the crushing beads are charged from the hopper. The bead cup and the crushing beads put into the bead cup are scraped out, and the blade for discharging the crushing beads from the peripheral edge of the bead cup, the bead cup, the blade, or a combination thereof is rotated. A bead feeder for crushing equipped with a motor for crushing.

In the crushing bead supply device, the motor rotates the bead cup, the blade, or a combination thereof, and the blade scrapes out the crushing beads put into the bead cup from the hopper for crushing from the peripheral edge of the bead cup. The beads are ejected. Therefore, it is possible to automatically and stably supply a constant amount of crushing beads that are worn and reduced in weight during crushing by a bead mill. Therefore, it is possible to reduce the work load at the time of crushing by the bead mill, suppress the instability of the quality of the object to be crushed due to the wear of the beads, and improve the quality of the object to be crushed.

It is preferable that the blade has a right-angled trapezoidal flat plate shape. When the blade has a right-angled trapezoidal flat plate shape, the fluidity of the crushing beads is improved, and the bead cup, the blade, or a combination thereof can be smoothly rotated.

It is preferable that the blade is not fixed to the bead cup or integrated with the bead cup. Since the blade is not fixed to or integrated with the bead cup, the bead cup, the blade, or a combination thereof can be rotated independently to scrape out the crushing beads put into the bead cup. ..

Another invention made to solve the above problems is a bead mill provided with the crushing bead supply device. Therefore, according to the bead mill, by providing the crushing bead supply device, a certain amount of crushing beads is automatically supplied, so that the crushing beads that are worn and reduced during crushing are stably replenished. it can. Therefore, in crushing using crushing beads, it is possible to reduce the work load at the time of crushing by the bead mill and improve the quality of the object to be crushed.

Another invention made to solve the above problems is a method of crushing an object to be crushed by using a bead mill and an apparatus for supplying crushing beads to the bead mill, wherein a certain amount of the crushing beads is used in the bead mill. This is a crushing method including a step of crushing the object to be crushed while continuously supplying the material to the crushed material.

As described above, in the crushing by the bead mill, the crushing beads wear and lose weight with the operation time. FIG. 1 is a graph schematically showing the relationship between the bead supply amount and the power consumption in the bead mill. Generally, when the beads are worn and the amount of beads inside the bead mill decreases, the particle size becomes coarse and the particle size distribution becomes wide, so that uniform pulverization becomes impossible. Therefore, the particle size distribution of the object to be crushed is measured at regular intervals, and the pulverization load is increased by mainly increasing the rotation speed of the bead mill so that the average particle size falls within a predetermined standard, resulting in coarseness. Adjust the grain size. Increasing the number of revolutions of the bead mill will increase the power consumption, as shown in FIG. By increasing the rotation speed of the bead mill, the number of collisions between the inside of the bead mill, the beads for crushing, and the object to be crushed increases, so that the wear inside the bead mill and the beads for crushing may be further promoted.
Further, if the weight of the beads for crushing is reduced more than necessary, energy is excessively consumed and the quality such as the average particle size and the particle size distribution of the object to be crushed cannot be maintained. Therefore, it is necessary to replenish the beads for the weight loss. In this way, when the beads are replenished intermittently while the crushing load is increased, the reduced amount of beads is filled in the bead mill at once, resulting in an overload. Further, immediately after the replenishment of the crushing beads, the excessive presence of the crushing beads may accelerate the wear of the beads or deviate from the particle size standard, so that a certain quality may not be maintained. In addition, since the crushing load of the bead mill is increased according to the consumption of the beads, the power consumption may increase.
Therefore, it is considered that the quality control of the object to be crushed can be further improved by adding the crushing beads little by little at short intervals. On the other hand, if the crushing beads are manually added little by little at short intervals, the work process becomes very complicated and the work load may be excessively increased. According to the crushing method, by using the crushing bead supply device, a fixed amount of crushing beads can be stably and continuously supplied to the bead mill according to the amount of wear of the crushing beads during the crushing step. Can be done. Therefore, according to the crushing method, it is possible to reduce the work load at the time of crushing by the bead mill and improve the quality of the object to be crushed. In addition, energy saving in the crushing process by the bead mill can be achieved.

In the crushing method, the crushing bead supply device includes a bead cup into which the crushing beads are charged, and in the crushing step, the crushing beads charged into the bead cup are scraped out to form the bead cup. It is preferable to supply a certain amount of the pulverizing beads from the peripheral edge. In this way, in the crushing step, the crushing beads put into the bead cup are scraped out, and a certain amount of the crushing beads is supplied from the peripheral edge of the bead cup, thereby forming a simple and compact device configuration. , A certain amount of crushing beads can be stably and continuously supplied to the bead mill.

According to the bead supply device for crushing, the bead mill and the crushing method of the present invention, it is possible to reduce the work load at the time of crushing by the bead mill and improve the quality of the object to be crushed.

It is a graph which shows typically the relationship between the bead supply amount and the power consumption in the bead mill in the prior art. It is the schematic sectional drawing of the bead supply apparatus for crushing which concerns on one Embodiment of this invention. It is a schematic front view of the blade of the bead supply device for crushing which concerns on one Embodiment of this invention. It is a figure explaining the bead supply principle by the crushing bead supply apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the change of the installation angle of the blade in the crushing bead supply device which concerns on one Embodiment of this invention. It is a graph which shows typically the relationship between the bead supply amount and power consumption in the bead mill which concerns on one Embodiment of this invention.

Hereinafter, the bead supply device for crushing, the bead mill, and the crushing method according to the embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

<Bead supply device for crushing>
The crushing bead supply device is a crushing bead supply device that supplies crushing beads to a bead mill. The crushing bead supply device can supplement the crushing beads worn or reduced during crushing by stably supplying a certain amount of crushing beads according to the consumption of the crushing beads in the crushing by the bead mill. it can. FIG. 2 is a schematic cross-sectional view of the crushing bead supply device. As shown in FIG. 2, the crushing bead supply device 1 can be used, for example, in a method described later as a “crushing method”. The crushing bead supply device 1 in the present embodiment includes a hopper 2 for storing the crushing beads 8, a bead cup 3 arranged under the hopper 2, a blade 10 for scraping out the crushing beads 8, and a bead cup 3. It is provided with a motor 7 for rotating.

The material of the crushing beads 8 is not particularly limited, and for example, high-hardness metals such as steel and chromium alloys, high-hardness ceramics such as alumina, zirconia, zircon, and titania, and known materials such as glass are used as characteristics of the object to be crushed. Can be selected according to.

The crushing beads 8 are generally formed in a spherical shape individually, and the average particle size of the crushing beads 8 is not particularly limited, but is selected according to the average particle size and the particle size of the object to be crushed. The average particle size is, for example, 0.05 mm or more and 10 mm or less.

The hopper 2 stores the crushing beads 8. The hopper 2 has an upper opening, a hopper main body 2a having a concave bottom and a substantially conical bottom surface, and a cup insertion cylinder 2b provided as a communication shape in the lower end hole of the hopper main body 2a. Be prepared. When the crushing beads 8 are charged into the bead cup 3, the discharge port of the cup charging cylinder 2b is inserted into the bead cup 3. Then, the crushing beads 8 stored in the hopper 2 are charged into the bead cup 3 from the cup charging cylinder 2b. When the crushing beads 8 reach the height of the discharge port of the cup charging cylinder 2b, the supply of the crushing beads 8 from the hopper 2 naturally stops. The discharge port of the cup insertion cylinder 2b is inserted into the bead cup 3, and the discharge port of the cup insertion cylinder 2b is made lower than the peripheral edge of the bead cup 3, so that the crushing beads 8 are formed into the cup insertion cylinder 2b. When the height of the discharge port is reached, the supply of the crushing beads 8 from the hopper 2 is naturally stopped.

An annular blade fixing plate 14 projecting in the radial direction is provided on the outer periphery of the cup insertion cylinder portion 2b.

The beads 8 for crushing are put into the bead cup 3 from the hopper 2. The filling amount of the crushing beads 8 depends on the average particle size of the crushing beads 8 to be filled, but from the viewpoint of the stability of the supply amount of the crushing beads 8, the uppermost surface of the filled crushing beads 8 The distance from the height to the height of the upper end of the bead cup 3 is preferably in the range of 0 mm or more and 20 mm or less, and more preferably in the range of 1 mm or more and 10 mm or less.

The insertion depth of the cup insertion cylinder 2b, which is the difference between the height of the discharge port of the cup insertion cylinder 2b inserted into the bead cup 3 and the height of the peripheral edge of the bead cup 3, is 1 mm or more and 20 mm or less. preferable. If the position of the discharge port of the cup insertion cylinder 2b is high and the insertion depth with the peripheral edge of the bead cup 3 is less than 1 mm, the crushing beads 8 may overflow. On the other hand, when the position of the discharge port of the cup insertion cylinder 2b is low and the insertion depth with the peripheral edge of the bead cup 3 exceeds 20 mm, crushing from the hopper 2 on the level surface of the discharge port of the cup insertion cylinder 2b Although the supply of the beads 8 for crushing is stopped, there is a possibility that the amount of scraped beads 8 for crushing cannot be sufficiently obtained. Since the insertion depth between the height of the discharge port of the cup charging cylinder 2b and the height of the peripheral edge of the bead cup 3 is within the above range, the crushing beads 8 are not charged into the bead cup 3 and stay in the hopper 2. It is possible to suppress that.

The bead cup 3 is rotatably supported by the rotating shaft 6 of the motor 7. The shape of the bead cup 3 is preferably a bottomed tubular shape from the viewpoint of efficiently scraping the crushing beads 8 with the blade 10. The bottom surface of the bead cup 3 is not particularly limited, and may be flat or curved.

The crushing bead supply device 1 includes a plurality of blades 10. As the bead cup 3 rotates, the blade 10 scrapes out the crushing beads 8 put into the bead cup 3 and discharges the crushing beads 8 from the peripheral edge of the bead cup 3 to the outside of the bead cup 3.

The shape of the blade 10 is not particularly limited, and examples thereof include a right-angled trapezoidal shape, a rectangle, a right-angled triangle, and a home base type. Further, each shape may have an arcuate angle. Among these, it is preferable to have a right-angled trapezoidal flat plate shape. Since the blade 10 has a right-angled trapezoidal flat plate shape, a constant amount of crushing beads 8 can be efficiently supplied.

FIG. 3 is a schematic front view of the blade 10. The blade 10 shown in FIG. 3 is a right-angled trapezoid having an upper base 10a, a lower base 10b longer than the upper base 10a and parallel to the upper base 10a, and a hypotenuse connecting the upper base 10a and the lower base 10b when viewed from the front. Has a shape. In the crushing bead supply device 1, the upper bottom 10a is located on the outer peripheral side and the lower bottom 10b is located on the inner peripheral side.

The right-angled trapezoidal blade 10 is fixed to the blade mounting bolt 12 with screws 16 and screws 17. The blade mounting bolt 12 to which the blade 10 is fixed is fixed to the blade fixing plate 14 provided in the cup insertion cylinder portion 2b of the hopper 2 by a set of nuts 13. The blade 10 is fixed to the blade fixing plate 14 so that the upper bottom 10a on the outer peripheral side and the lower bottom 10b on the inner peripheral side are parallel to the rotation axis 6 of the motor 7. As described above, the crushing bead supply device 1 is provided with a plurality of blades 10 at intervals along the circumferential direction. The blade 10 may be attached to the bead cup 3, but it is preferable that the blade 10 is not fixed to the bead cup 3 or integrated with the bead cup 3 as in the present embodiment. Since the blade 10 is not fixed to the bead cup 3 or integrated with the bead cup 3, the bead cup 3, the blade 10 or a combination thereof can be rotated independently. Therefore, as will be described later, the bead cup 3 and the blade 10 can be rotated independently to scrape out the crushing beads 8 put into the bead cup 3.

Examples of the material of the blade 10 include iron, stainless steel, ceramic, and plastic.

Examples of the number of blades 10 include 1 or more and 4 or less. When crushing beads 8 having a high specific density such as zirconia beads are used, the number of blades 10 may be appropriately increased in order to enhance the scraping ability of the blades 10. In this embodiment, one to three blades 10 are fixed to the blade fixing plate 14. If the number of blades 10 is excessively increased, the fluidity of the crushing beads 8 between the blades 10 may decrease, and the scraping ability may decrease.

When the bead cup 3 has a bottomed tubular shape and the shape of the blade 10 is a right-angled trapezoid, the ratio of the bead cup insertion depth of the blade 10 to the depth of the bead cup 3 is 0.2 or more and 0.8 or less. preferable. Here, the insertion depth of the blade 10 is the difference between the height of the tip end portion, that is, the lowermost end portion of the blade 10 inserted into the bead cup 3, and the height of the peripheral edge of the bead cup 3. When the ratio of the insertion depth of the blade 10 to the depth of the bead cup 3 is within the above range, a constant amount of crushing beads 8 can be efficiently supplied.

When the bead cup 3 has a bottomed tubular shape and the shape of the blade 10 is a right-angled trapezoid, the distance from the upper surface of the beads filled in the bead cup 3 to the tip of the lower bottom 10b of the blade 10 inserted (filled beads). The insertion depth) is preferably 2.5 mm or more and 30 mm or less. If the insertion depth into the filled beads is less than 2.5, the scraping ability of the crushing beads 8 may decrease. If the insertion depth into the filled beads exceeds 30 mm, the amount of the crushing beads 8 to be agitated becomes too large, the load related to the agitation increases, and the crushing bead supply device 1 may be damaged. .. When the clearance between the bead cup 3 and the bottom surface is narrowed, the crushing beads 8 are engaged between the blade 10 and the bottom surface of the bead cup 3, and the crushing beads 8 and the crushing bead supply device are used. There is a risk of damage to 1.

The range of the shortest length between the inner wall of the bead cup 3 indicating the gap between the bead cup 3 and the blade 10 and the upper bottom 10a which is the outer peripheral end of the blade 10 is the average particle size of the crushing beads 8. It is preferably 1.5 times or more and 4 times or less. When the shortest length between the inner wall of the bead cup 3 and the side wall of the blade 10 is within the above range, a certain amount of crushing beads 8 can be stably supplied. When the shortest length between the inner wall of the bead cup 3 and the side wall of the blade 10 is less than 1.5 times the above average particle size, the crushing beads 8 are caught between the blade 10 and the bead cup 3. There is a risk that the crushing beads 8 may be damaged or equipment such as a motor may be damaged due to an excessive load. If the shortest length between the inner wall of the bead cup 3 and the side wall of the blade 10 is more than four times the average particle size, a sufficient supply amount of the crushing beads 8 may not be obtained.

The motor 7 is attached with a rotating shaft 6 that is rotatably supported via a speed reducer 5. The motor 7 rotates the bead cup 3 by rotationally driving the rotating shaft 6 via the speed reducer 5. As described above, the motor 7 rotates the rotating shaft 6 via the speed reducer 5 to rotate the motor 7 at a constant rotation speed, and the speed reducer 5 rotates the bead cup 3 (rotation speed). Can be adjusted.

The number of rotations of the bead cup is preferably 0.5 times / minute or more and 20 times / minute or less. When the rotation speed of the bead cup is 0.5 times / minute or less, a stable and sufficient supply amount of the crushing beads 8 may not be obtained. When the number of rotations of the bead cup is 20 times / minute or more, the crushing beads 8 may pop out from the peripheral portion of the bead cup and it may be difficult to adjust the supply amount of the crushing beads.

The tub 4 has a supply port 19 that serves as a passage for the crushing beads 8, and its bottom surface is inclined downward toward the supply port 19.

FIG. 4 is a diagram for explaining the supply principle of the crushing beads 8 by the crushing bead supply device 1. As shown in FIG. 4, the blade 10 is embedded in the crushing beads 8 put into the bead cup 3. The filling amount of the crushing beads 8 in the bead cup 3 is adjusted to an amount that does not spill from the bead cup 3 even when the blade 10 is embedded. In the crushing bead supply device 1, the crushing beads 8 filled inside the bead cup 3 overflow by rotating the bead cup 3. Then, the crushing beads 8 fall into the tub 4, move to the supply port 19 which is a passage of the crushing beads 8 along the gutter whose bottom surface is inclined toward the bead mill 20, and are supplied to the inside of the bead mill 20.

In the crushing bead supply device 1, the weight loss of the crushing beads 8 scraped out reaches the height of the discharge port of the cup insertion cylinder 2b at any time due to a natural drop from the hopper 2. Will be replenished.

The crushing bead supply device 1 has a control mechanism (not shown) that controls the rotation speed of the motor 7. As the control mechanism, a conventionally known computer system can be used.

As described above, the supply amount of the crushing beads 8 to the bead mill 20 can be increased or decreased by adjusting the insertion depth of the blade 10 in the bead cup 3 filled with the crushing beads 8. Further, it can be increased or decreased by controlling the rotation speed of the bead cup 3 using the above control mechanism. Further, the supply amount of the crushing beads 8 can be increased or decreased by adjusting the clearance between the inner wall of the bead cup 3 and the inserted blade 10 by changing the installation angle of the blade 10. Here, the clearance between the inner wall of the bead cup 3 and the blade 10 means the shortest distance between the inner wall of the bead cup 3 and the shortest portion on the outer peripheral side of the blade 10.

FIG. 5 is a diagram for explaining a change in the installation angle of the blade 10. As shown in FIG. 5, the installation angle of the blade 10 can be changed, for example, by moving the shortest portion on the outer peripheral side of the blade 10 along the circumferential direction. L1 shown in FIG. 5 shows the clearance between the inner wall of the bead cup 3 and the blade 10 before the movement of the blade 10, and L2 shows the clearance between the inner wall of the bead cup 3 and the blade 10 after the movement of the blade 10. The clearance between the inner wall of the bead cup 3 and the blade 10 is preferably set to 1.5 times or more and 4 times or less the average particle size of the supplied crushing beads 8, and 1. It is more preferable to set it to 5 times or more and 3 times or less. When the clearance is less than 1.5 times the average particle size of the crushing beads 8, the crushing beads 8 are caught between the inner wall of the bead cup 3 and the blade 10, and the crushing beads 8 are damaged or the device is damaged. May be damaged. If the clearance exceeds four times the average particle size of the crushing beads 8, the crushing beads 8 may become unstable and the beads may not be squeezed out.

The bead mill 20 to which the crushing bead supply device 1 supplies the crushing beads 8 is not particularly limited, and a known bead mill is targeted. For example, an apparatus for pulverizing a mill filled with a pulverizing medium such as balls and beads by forcibly stirring the mill with a stirring rod, a rotating disk, or the like. Further, the bead mill 20 may be either a vertical type or a horizontal type.

According to the crushing bead supply device, it is possible to automatically and stably supply a constant amount of crushing beads that are worn and reduced in weight during crushing by a bead mill. Therefore, it is possible to reduce the work load at the time of crushing by the bead mill and improve the quality of the object to be crushed due to the wear of the beads.

In addition, the crushing bead supply device is an open-air type and supplies crushing beads from the hopper by natural fall. Therefore, the device structure is simple and maintainability is good, and troubles such as beads clogging in the pipe occur. Although it is unlikely to occur, even if a blockage occurs, the blockage can be quickly removed, and the device can be quickly restored.

<Bead mill>
The bead mill 20 includes the above-mentioned crushing bead supply device 1. The bead mill 20 has a rotatable crushing rotor arranged in a container. Then, the crushing beads 8 and the object to be crushed are put in a container, and the object to be crushed is crushed by the crushing beads 8 by rotating the crushing rotor. According to the bead mill 20, by providing the crushing bead supply device 1, a certain amount of crushing beads 8 is automatically supplied, so that the crushing beads 8 that are worn and reduced during crushing are stabilized. Can be replenished. Therefore, in crushing using the crushing beads 8, the work load at the time of crushing by the bead mill can be reduced, and the quality of the object to be crushed can be improved.

<Crushing method>
The crushing method according to the embodiment of the present invention is a method of crushing an object to be crushed by using a bead mill and the above-mentioned crushing bead supply device. The crushing method includes a step of crushing the object to be crushed while continuously supplying a certain amount of the crushing beads to the bead mill.

The crushing method is a method of crushing an object to be crushed by using a bead mill and an apparatus for supplying crushing beads to the bead mill.

<Crushing process>
In the crushing step, the object to be crushed is crushed while continuously supplying a certain amount of the crushing beads to the bead mill. Further, the crushing bead supply device includes a bead cup into which the crushing beads are charged, and in the crushing step, the crushing beads charged into the bead cup are scraped out and constant from the peripheral edge of the bead cup. It is preferable to supply the amount of the above-mentioned crushing beads. In the crushing method, a fixed amount of the crushing beads is continuously supplied to the bead mill according to the amount of wear by using the bead mill and the crushing bead supply device.

FIG. 6 is a graph schematically showing the relationship between the bead supply amount and the power consumption in the pulverization method. As shown in FIG. 6, in the crushing method, since the operation is performed while suppressing the fluctuation of the electric power required for crushing, the quality of the object to be crushed can be stabilized, the electric power cost can be suppressed, and energy saving can be achieved. ..

According to the crushing method, by using the crushing bead supply device, a fixed amount of crushing beads can be stably and continuously supplied to the bead mill according to the amount of wear of the crushing beads during the crushing step. Can be done. Therefore, according to the pulverization method, it is possible to reduce the work load at the time of pulverization by the bead mill and improve the quality of the object to be pulverized. In addition, energy saving in the crushing process by the bead mill can be achieved. Further, since the wear of the crushing beads is suppressed, the amount of the crushing beads used can be reduced as a result, and the wear inside the bead mill body can also be suppressed, so that the maintainability of the bead mill is improved.

[Other Embodiments]
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is not limited to the configuration of the above embodiment, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. To.

In the above embodiment, the motor rotates the bead cup to discharge the crushing beads from the peripheral edge of the bead cup, but the motor rotates the blade to discharge the crushing beads from the peripheral edge of the bead cup. May be discharged. Further, the crushing beads may be discharged from the peripheral edge of the bead cup by rotating both the bead cup and the blade.

In the above embodiment, the configuration in which a constant amount of beads is continuously supplied during pulverization by a bead mill is shown, but a constant amount of beads may be intermittently supplied at regular intervals.

The crushing bead supply device may be provided with a removable cover for the purpose of preventing foreign matter from entering the upper part of the hopper, the upper part of the bead cup, and the gutter.

Hereinafter, the present invention will be described in detail based on Examples, but the present invention is not limitedly interpreted based on the description of this Example.

[Example 1]
Adjust the position of the hopper so that the insertion depth of the hopper cup insertion cylinder into the bead cup of the bead supply device is 1 mm, fill the bead cup with ceramic beads (average particle size 3 mm), and fill the bead cup. It was set so that the surface and the bottom surface of the hopper insertion part cylinder were flush with each other (1 mm deep from the top surface of the bead cup). Next, insert one right-angled trapezoidal blade so that the insertion depth with respect to the bead cup is 11 mm, and adjust the angle of the blade to make the clearance between the inner wall of the bead cup and the blade twice the average particle size of the beads for crushing. The blade was fixed so that it was set to 6 mm.

The hopper was then filled with any amount of beads. It was confirmed that even if the beads were filled in the hopper, the beads for crushing did not overflow from the bead cup, and the beads were supplied from the hopper by the amount discharged from the bead cup. The number of rotations of the bead cup was rotated at 12.4 times / minute, the beads for crushing were discharged from the bead cup, the beads were supplied to the gutter, and the bead supply amount was actually measured.

[Examples 2 to 6]
Example 2 was carried out under the same conditions as in Example 1 except that the insertion depth of 11 mm into the bead cup of Example 1 was changed to 23 mm.
Example 3 is different from Example 2 except that the installation angle of the blade of Example 2 is changed and the clearance between the inner wall of the bead cup and the blade is adjusted to 5.5 mm (1.83 times the average particle size). It was carried out under the same conditions.
Example 4 was carried out under the same conditions as in Example 2 except that the number of blades was increased to two.
Example 5 was carried out under the same conditions as in Example 2 except that the number of blades was increased to three.
Example 6 is different from Example 1 except that the installation angle of the blade of Example 1 is changed and the clearance between the inner wall of the bead cup and the blade is adjusted to 5.5 mm (1.83 times the average particle size). It was carried out under the same conditions.

The specific conditions of Examples 1 to 6 are shown in Table 1. The supply amount of crushing beads to the bead mill is shown as a ratio when the supply amount of Example 1 is 1.00.

[Evaluation of bead feeder for crushing]
(Damage of crushing beads)
After the test was completed, the beads in the bead cup and the discharged beads were collected and sieved using an 8-mesh (eye hole of about 2 mm) sieve. Since 3 mm beads were used, the broken beads were discharged from the pores of the sieve. Therefore, it was confirmed whether or not the damaged beads were discharged. As the evaluation criteria, when there was no abnormality, the case where no damage was observed was regarded as "no abnormality", and the case where the beads were damaged and the crushing beads were discharged from the sieve was regarded as "abnormal".

(Stability of supply of crushing beads to the bead mill)
The crushing beads were discharged from the bead cup for a certain period of time, and the mass of the crushing beads discharged periodically for 5 minutes was measured to confirm the fluctuation of the mass. It was judged to be stable when the mass fluctuation was within 5%. In addition, visually, the gap between the inner wall of the bead cup and the blade is clogged, whether or not the beads are ejected from the gutter to the outside of the gutter, and the beads are stopped or clogged in the gutter. The presence or absence of was visually confirmed.

As shown in Table 1, no breakage of the crushing beads was observed in any of Examples 1 to 6. Further, in any of Examples 1 to 6, the gap between the inner wall of the bead cup and the blade is clogged, the beads are ejected from the bead cup to the gutter, and the beads are ejected to the outside of the gutter, and the gutter is used. The rolling of the beads did not stop or clogged, and a certain amount of crushing beads could be stably supplied.
In this way, by adjusting the insertion depth of the blades, the number of blades, and the gap between the inner wall of the bead cup and the blades of the examples, it can be confirmed that the desired amount of crushing beads can be stably supplied without damage. It was.

[Supply test to bead mill]
Next, under the conditions of Example 6, the crushing beads supply device is applied to a practical crusher (bead mill), and the crushing beads supply test is carried out together with Comparative Example 1 in which the crushing beads are manually added. did. Specifically, of the two crushers installed in parallel in the manufacturing process of the object to be crushed, one crusher uses a bead supply device to continuously supply beads. The other was a method in which workers intermittently supplied beads for crushing, as in the conventional method. In the crusher that continuously supplies crushing beads using the crushing bead supply device, the supply amount of crushing beads per unit time is calculated from the supply amount when the beads are supplied intermittently, and the crushing in the crushing bead supply device is performed. The supply amount of beads for crushing was set, and the supply amount of beads for crushing was adjusted (reduced supply amount) while checking the quality (particle size) of the object to be crushed and the power value of the crusher. In calculating the supply amount of crushing beads per unit time, the weight of the beads stored in the hopper is actually measured, and the crushing beads per unit time are measured from the time when the hopper is empty. It was confirmed that there was no difference from the measured supply amount.

After confirming that the quality of the object to be crushed is stable, the supply amount of beads for crushing is fixed, and continuous operation is performed for 7 days, the power value of the bead mill, the fluctuation of the power value of the bead mill, and the stability of the quality of the object to be crushed. I confirmed the sex.

(Amount of crushing beads input)
Example: The amount of beads supplied per unit time was actually measured.
Comparative Example: The bead supply amount per unit time was calculated by dividing by the bead supply amount at one time and the time until the next supply. Table 2 shows the usage amount per unit time in the example when the usage amount per unit time of the beads in the comparative example is 100.

(Power usage)
For the electric power value, the integrated value and the average value for 7 days were obtained based on the recorded data of the ammeter provided in each crusher. For the power consumption, the average value of the power value (kw / h) of the crusher displayed on the instrument is calculated, and the power value in the example when the power value of the comparative example is 100 is shown in Table 2.

(Fluctuation of power consumption)
The standard deviation was calculated based on the above power consumption data. Table 2 shows the standard deviations of the examples when the standard deviation of the power values of the comparative examples is 1.

(Quality stability of the object to be crushed)
The quality stability of the material to be crushed was evaluated by the fluctuation of the average particle size of the material to be crushed. Regarding the fluctuation of the average particle size of the object to be crushed, use a laser diffraction method particle size distribution meter (Microtrack MT-3300II: manufactured by Microtrack Bell) once / 4 hours for the object to be crushed at the outlet of each crusher. The average value and standard deviation of the average particle size of the object to be pulverized were determined. Table 2 shows the standard deviations of the examples when the standard deviation of the particle diameters of the comparative examples is 1.

(Number of times crushing beads are supplied)
The number of times the beads for crushing of Example 6 and Comparative Example 1 were supplied was measured. In Comparative Example 1 in which the worker intermittently manually supplies the beads for crushing to the bead mill, the number of times the worker puts the beads after measuring the supply amount every 8 hours was measured. On the other hand, in Example 6 using the crushing bead supply device, the number of times the worker manually supplied the crushing beads to the hopper was measured.

The results are shown in Table 2.

As shown in Table 2, it can be seen from the results of Example 6 that the amount of beads used is halved by continuously supplying the beads. Regarding the amount of electric power used, it can be seen from the results of Example 6 that the bead mill was able to save energy by continuously supplying the crushing beads using the crushing bead supply device. Regarding the fluctuation of the electric power consumption, from the result of Example 6, it can be seen that the fluctuation of the electric power value was reduced and the crusher could be operated stably. Further, regarding the fluctuation of the average particle size of the material to be crushed, from the result of Example 6, by using the bead supply device for crushing, the fluctuation of the particle size can be suppressed and the quality of the material to be crushed can be stabilized. You can see that. Further, regarding the number of times the beads for crushing were supplied, in Comparative Example 1, the workers were intermittently manually supplying the beads, so that the number of times of supply per day was large and the burden on the workers was large. On the other hand, when the crushing bead supply device was used, it was sufficient to fill the hopper with crushing beads once every two days because of the volume of the hopper. It was also confirmed that increasing the volume of the hopper can further reduce the number of times beads are supplied and greatly improve workability.

From the above results, it was shown that the crushing bead supply device can reduce the work load at the time of crushing and improve the quality of the object to be crushed.

The bead supply device for crushing, the bead mill and the crushing method of the present invention can be suitably used for crushing the object to be crushed.

1 Crushing bead supply device 2 Hopper 2a Hopper body 2b Cup insertion cylinder 3 Bead cup 4 tub 5 Reducer 6 Rotating shaft 7 Motor 8 Crushing beads 10 Blade 10a Upper bottom of blade 10b Lower bottom of blade 12 Blade mounting Bolts 13 Nuts 14 Blade fixing plates 16 Screws 17 Screws 19 Supply port 20 Bead mill

Claims (6)

A crushing bead supply device that supplies crushing beads to a bead mill.
With the hopper that stores the above beads for crushing,
A bead cup into which the crushing beads are put from the hopper, and
A blade for scraping out the crushing beads put into the bead cup and discharging the crushing beads from the peripheral edge of the bead cup.
A bead feeder for crushing including the bead cup, the blade, or a motor for rotating a combination thereof. The bead supply device for crushing according to claim 1, wherein the blade has a right-angled trapezoidal flat plate shape. The bead supply device for crushing according to claim 1 or 2, wherein the blade is not fixed to the bead cup or integrated with the bead cup. A bead mill including the crushing bead supply device according to claim 1, claim 2 or claim 3. A method of crushing an object to be crushed using a bead mill and a device for supplying crushing beads to the bead mill.
A crushing method comprising a step of crushing the object to be crushed while continuously supplying a certain amount of the crushing beads to the bead mill. The crushing bead supply device includes a bead cup into which the crushing beads are charged.
The crushing method according to claim 5, wherein in the crushing step, the crushing beads put into the bead cup are scraped out and a fixed amount of the crushing beads is supplied from the peripheral edge of the bead cup.

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