JPH06269653A - Modification of surface of powder - Google Patents

Abstract

PURPOSE:To make quality constant by always making a series of operations constant by performing a series of operations such as the weighing operation of a mixed powder of matrix particles and daughter particles, the time imparting modifying action in a stirring impact device or the like by sequence control. CONSTITUTION:A premixing machine 2 mixing matrix particles and the fine daughter particles added and applied to the surfaces of the matrix particles, a stirring impact machine 5 stirring the mixed powder and bonding the daughter particles to the matrix marticles under pressure by the impact due to compressed air streams and a sequence control mechanism 6 successively performing a series of those operations are provided. A predetermined quantity of the powder mixed by the premixing machine 2 is measured by a weighing machine 4 and supplied to the stirring impact device 5 to be stirred for a predetermined time to bond the daughter particles to the surfaces of the matrix particles under pressure. These operations are successively performed on the basis of a preset program by sequence control.

Description

Detailed Description of the Invention

[0001]

Industrial Applicability The present invention efficiently attaches fine child particles to the surface of a mother particle to modify the surface of the mother particle and efficiently modify the surface of the powder to give a new performance. The present invention relates to a reforming method for performing well, in particular, a reforming method for efficiently performing a series of steps from the supply of mother particles and child particles to the completion of reforming.

[0002]

2. Description of the Related Art As a powder surface modifying apparatus for adhering fine child particles onto the surface of the mother particles, there is disclosed, for example, Japanese Patent Laid-Open No.
There are methods described in Japanese Patent No. 140636 or Japanese Patent Publication No. 4-61688. The former method is one in which another solid particle is fixed on the surface of the solid particle by using an impact type impacting means, and the other solid particle is softened and melted to be fixed. It accommodates a turntable that rotates at high speed and has impact pins radially attached to the outer circumference, and a collision ring that has a constant distance from the impact pins is installed on the inner surface of the casing. Supply into the casing, if necessary supply an inert gas, and the impact action by the impact pin,
The compression action received by the collision ring is repeated, and this action is repeated by one rotating disk and the circulation circuit until the child particles are fused to the entire surface of the mother particle. It was done by doing so.

In the latter method, a stirrer, an air flow pump and a collision plate are combined, the mother particles and the child particles are stirred by the stirrer to adhere the child particles to the surface of the mother particles, and the suction force of the air flow pump is applied to the child particles. The mother particles having the child particles attached thereto are sucked, and the mother particles to which the child particles are attached are made to collide with the collision plate by the collision air to press a part of the child particles on the surface of the mother particles, and then returned to the stirrer again, and the mother particles Repeated mixing with particles,
It is configured such that the feeding into the air flow pump and the collision against the collision plate by the pressure air are repeated.

[0004]

In any of the above methods, the reforming device, that is, the stirring impact device is operated intermittently, and a predetermined amount of the mixture of the mother particles and the child particles is weighed, and the mixture is fed into the device. The mixture is supplied to the reactor and shocked for a certain period of time, and then shocked, and then the modified particles and the surplus particles are sieved. Since these operations are performed manually by the operator, there are problems that the supply amount of the raw materials, the stirring impact application time, etc. are not constant, and inefficiency causes unevenness in quality. In view of these points, the present invention has an object to automatically perform a series of these operations by sequence control.

[0005]

A method for controlling modification of a powder surface of the present invention for achieving the above object comprises a mother particle and a child particle which is a fine powder to be attached and coated on the mother particle surface. A premixing machine for mixing, a measuring machine for measuring a predetermined amount of the mixed powder mixed, and stirring for stirring the measured powder and impacting by a pressure air flow to press-bond the child particles to the mother particles to modify the particles. It consists of an impact machine and a sequence control mechanism that performs these series of operations in sequence.A predetermined amount of the mixed powder mixed by the premix machine is measured by a weighing machine, and this is supplied to a stirring impact machine and stirred and impacted for a predetermined time. The applied child particles are pressure-bonded to the surface of the mother particles, and then a series of steps for carrying out the powder are sequentially performed by sequence control based on a preset program.

According to a second aspect of the present invention, the agitation impactor is provided with a pressure adjusting valve and a pressure sensor for adjusting the pressure inside the machine, and when the pressure inside the machine is adjusted, the reforming completion powder is interlocked with the discharge valve. It is designed to be discharged out of the machine by pressure gas.

A third aspect of the invention is to provide a pressurized gas supply pipe in a powder supply circuit into the stirring impact machine for promoting the filling of the mixed powder into the machine, and regulate the pressure to a predetermined pressure by a regulating valve. It is characterized by that.

According to a fourth aspect of the present invention, the agitating impactor is provided with an agitating blade and an airflow pump, and agitating the mixed powder by the agitating blade and imparting an impact to the powder due to high speed discharge by the airflow pump. By the impact, the child particles are attached to the mother particles, and a discharge hole is provided so as to face the negative pressure generation portion due to the rotation of the air flow pump, and the powder focused by the negative pressure is discharged from the discharge hole. It is a thing.

[0009]

[Operation] A series of operations such as measuring the mixed powder of mother particles and child particles and the time for imparting the modifying action in the stirring impactor are all performed according to a predetermined order by sequence control.

[0010]

[Examples] The figures show examples of the present invention. FIG. 1 is an overall control circuit diagram of a powder surface reforming apparatus. The apparatus 1 comprises a premixing machine 2 for premixing mother particles and a predetermined amount of fine child particles, and the premixing machine 2 for mixing the particles. A screw conveyor 3 for feeding the mixed powder, a weighing machine 4 for the fed mixed powder, and a reforming device for stirring and agitating the weighed powder with a pressure air flow, that is, a stirring impactor 5. In addition, a sequence control mechanism 6 that sequentially operates these in a preset order is mainly configured. 8
Is a separator for separating the modified powder and the surplus child powder.

The weighing machine 4 accommodates a bottomed weighing hopper 10 whose one end is connected to a turning motor M2 in an external hopper 11. The turning motor is placed on a load cell 12, for example, and is fed from the screw conveyor 3. Measuring powder 1
0 when the load cell 12
Then, the operation of the conveyor 3 is stopped, and the weighing hopper 10 is turned over and charged into the external hopper 11. Reference numeral 13 is an air cylinder attached to the hopper for applying vibration.

The stirring impactor 5 is, for example, Japanese Patent Publication No. 4-616.
The structure described in JP-A-88 is applied. The outline is shown in FIG. The stirring impactor 5 is provided with a stirring blade 15 and an air flow pump 16, and the powder is fed to the stirring blade 15 side and stirred by the rotation of the blade to attach the child particles to the surface of the mother particles. Along with this agitation, a part is sucked by the airflow pump 16 by the suction force, and is discharged at high speed by the centrifugal force accompanying the rotation of the pump and collides with the collision plate 18 via the discharge passage 17. The child particles attached by this impact force bite into the surface of the mother particles or are fused. Then, it is transferred again to the stirring blade 15 side, and the above operation is repeated,
This is carried out for a predetermined time to attach the child particles to the entire surface of the mother particles, and then the lower discharge valve 19 is opened to discharge the mother particles. In this case, the discharge hole 20 is provided substantially in the central direction of the airflow pump 16, that is, toward the negative pressure side generated by the rotation of the pump. As a result, the powder fed out from the stirring blade 15 is focused on the negative pressure portion, and therefore can be effectively discharged from the discharge hole.

The sequence control mechanism 6 will be described below with reference to FIG.
The control procedure by is explained. The powder mixed by the premixing machine 2 is fed out by the screw conveyor 3 and supplied into the weighing hopper 10 of the weighing machine 4, and when the predetermined amount is reached, the supply from the conveyor 3 is stopped.
M1 is the conveyor drive motor. Then the motor M2
Is rotated and the powder is put into the outer hopper 11. This external hopper 11 is connected to the cushion tank 2 via a transport pipe 21.
3, the transport pipe 21 is provided with an opening / closing valve 22, the valve 22 is opened, and the external hopper 11 is vibrated by the air cylinder 13, so that the powder falls into the cushion tank 23. To do. The tank 23 is for adjusting the deviation between the feeding timing from the weighing machine 4 and the receiving timing of the stirring impact machine 5 in the next step. After the feeding is completed, the valve 22 is closed. A pressurized gas supply pipe 24 for injecting an inert gas such as compressed air or nitrogen gas is directly connected to the tank 23 or directly through the transportation pipe 21, and the supply pipe 24 is provided with a regulating valve 25. . This is to promote the feeding of the powder in the cushion tank 23 into the stirring impactor 5. Reference numeral 26 is an air cylinder for applying vibration to the tank 23.

This cushion tank 23 is connected to the stirring impactor 5 via a connecting pipe 27.
Is provided with an opening / closing valve 28, the opening / closing valve 28 is opened, vibration is applied to the tank 23 by the air cylinder 26, and the adjusting valve 25 is opened, whereby the powder is rapidly supplied to the stirring impactor 5. The valve 28 is closed.

A pressure sensor PS for detecting the pressure inside the machine and a pressure gas adjusting pipe 30 are attached to the stirring impactor 5.
The gas adjusting pipe 30 is provided with an adjusting valve 31 for adjusting the pressure gas supplied and an exhaust (relief) valve 32. As a result, pressurized air or an inert gas is supplied into the stirring impactor 5, and the stirring and impact are effectively performed by maintaining the pressure at a predetermined pressure, and the reforming completed powder is efficiently discharged in conjunction with the discharge valve 19. It becomes possible.

By stirring and impacting the powder in the stirrer / impactor 5 as described above, the surface of the mother particles is modified, and after completion, the lower discharge valve 19 is opened, but the discharge port 2 is also opened.
0 is provided toward the negative pressure side of the airflow pump 16 as described above, and thereby the powder from the stirring impactor 5 is effectively transferred to the separator 8 via the discharge pipe 40. The separator 8 is provided with an appropriate sieving mechanism to separate the modified mother particles and the surplus fine child particles, the modified mother particles are dropped and stored in the product box 41, and the child particles are sucked by the suction fan 42.
Is discharged together with the exhaust gas.

In addition, the sequence control mechanism 6 directly to the drive motor in each of the above operations, and the pressure-air switching stack valve 7 to each a-cylinder.
Done through.

[0018]

As described above, according to the present invention, the mixed powder of the mother particles and the fine particles is modified and modified by applying the stirring impact action for a predetermined time by the stirring impactor. Since a series of reforming operations for the discharge of is carried out by the sequence control mechanism, the operations are always constant, therefore the quality is kept constant, the efficiency is improved, and the labor can be saved. At this time, in the second aspect of the invention, if the pressure adjusting valve and the pressure sensor in the stirring impactor are provided, it is possible to easily adjust the pressure in the apparatus, improve the stirring efficiency, and open the discharge valve. In that case, the pressure gas can quickly carry out the powder inside the apparatus. Further, the third aspect of the invention is provided with a pressurized gas supply and a regulating valve for facilitating the filling of the mixed powder into the stirring impactor,
It is possible to improve the working efficiency by accelerating the filling speed of the powder in the stirring impactor. Still further, according to a fourth aspect of the invention, the stirring impactor is provided with a stirring blade and an air flow pump, and a discharge hole is provided so as to face a location where the powder is focused by the negative pressure effect of the air flow pump. It can be done efficiently.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a powder surface reforming apparatus of the present invention.

FIG. 2 is a front view of a reformer.

FIG. 3 is a side view of FIG.

FIG. 4 is a vertical sectional view of a stirring impactor.

FIG. 5 is an explanatory view of the action of the stirring impactor.

[Explanation of symbols]

 1 reformer 2 premix machine 3 screw conveyor 4 weighing machine 5 stirring impactor 6 sequence control mechanism 20 discharge hole 24 pressurized gas supply pipe 31 pressure regulating valve PS pressure sensor

Claims (4)

[Claims] 1. A premix machine for mixing mother particles and child particles of fine powder to be attached and coated on the surface of the mother particles, and a measuring machine for measuring a predetermined amount of the mixed powder.
An agitating impactor for adhering and modifying child particles to mother particles by agitation and impact of a measured air flow to agitate the measured powder,
It consists of a sequence control mechanism that sequentially performs these series of operations, measures a predetermined amount of mixed powder mixed by a pre-mixing machine with a weighing machine, supplies this to a stirring impactor, applies stirring and impact for a predetermined time, and child particles A method for modifying the surface of a powder, characterized in that a series of steps of adhering the powder to the surface of the mother particle by pressure and then carrying out the powder are sequentially performed by sequence control based on a preset program. 2. The stirring impactor is provided with a pressure adjusting valve and a pressure sensor for adjusting the pressure inside the agitator, and the reforming completed powder is removed from the outside of the agitator by pressure gas in conjunction with the adjustment of the inside pressure and the discharge valve. The method for modifying the surface of a powder according to claim 1, wherein 3. A pressurized gas supply pipe is provided in a powder supply circuit into the stirrer for promoting the filling of the mixed powder into the stirrer, and a regulated valve regulates the pressure to a predetermined pressure. Item 1. A method for modifying a powder surface according to item 1. 4. An agitating impactor is provided with an agitating blade and an air flow pump, agitating the mixed powder by the agitating blade, and imparting an impact to the powder due to high-speed discharge by the air flow pump. 2. The powder is attached to the mother particles, and a discharge hole is provided so as to face a negative pressure generation position due to the rotation of the air flow pump, and the powder focused by the negative pressure is discharged from the discharge hole. Method for modifying powder surface.