JPH0798140B2 - Method and apparatus for setting and adjusting the mixing ratio of powder and granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for adjusting and adjusting a mixing ratio of a plurality of types of powder and granules, a method for mixing the same, and an apparatus for the same.

[Conventional technology]

Conventionally, when setting the mixing ratio of a plurality of types of powder or granules, the weight or volume of the powder or granules has been measured one by one with a measuring instrument. Then, they have been supplied to a mixing device and mixed. However, when these mixing ratios required precision and a higher degree of dispersion, there were still many points that were insufficient for achieving those purposes.

Also, in those mixing devices, there are roughly two types of conventional methods. That is, one is a method in which powder particles are mixed by turning a rotary blade in a container (such as a ribbon blender), and the other is a method in which the container itself is rotated and the powder contained in the container is rotated. The method is to move the particles up and down by gravity to mix them (such as a rotary mixer). This is a method of mechanically mixing the powder and granules. Therefore, it cannot be said to be sufficient when the mixing ratio is a very small value or when microscopic dispersion is required. Moreover, the volume of the container is also relatively large, the mixing time is relatively long,
Further, there are many batch systems, and accordingly, many man-hours are required, which is a big bottleneck particularly on the flow line.

[Problems to be solved]

Recently, with the rapid growth of high-tech, the demands for small value ratio mixing of powder and granules and microscopic uniform dispersion have increased rapidly. However, as described above, it has become difficult to sufficiently satisfy these requirements in the conventional mixing method and mechanical method.

The motivation of the present invention was to simply and quickly perform micrometering of powder and granules, atomize them, and perform fine and effective mixing.

[Means for solving problems]

As described above, from a completely different perspective from the conventional measuring method using a measuring instrument or the conventional mixing device, it is possible to set the mixing ratio in a smaller amount and easily, and to make them finer and more uniform. It is an object of the present invention to disperse them into a mixture and to provide them with a mixture of high quality granules most effectively by the simplest method and apparatus.

The gist of the present invention is that, when air spraying a plurality of types of powder and granules in a semi-sealed container by each powder and granule ejector, first, the amount of air supplied to them is approximately equivalent to each mixing ratio. Then, in a pulsed or intermittent manner, the powder ejector is intermittently sprayed with the air, causing them to collide with each other, and causing the mixed powder granules in the form of fumes to be generated as described above. A method and an apparatus for obtaining a mixture of powder and granules by introducing the mixture into a gas and powder separator outside the container to separate it from gas.

The method according to the present invention will be described in detail. See FIG. Air spray (Sa, Sb) of a plurality of types of powder and granules (A, B, ...) is performed in the semi-closed funnel-shaped container (1) by the powder and granule ejectors (3A, 3B, ...), It becomes a smoke body. The spray streams collide with each other, and due to the reflected flow (Sr) and turbulent flow (Sc), the fumes are mixed and mixed with each other. The mixing ratio of them is regulated by the volume of air supplied to the powder ejector (3A, 3B, ...) × Velocity. If their speeds are constant, their capacities must be changed, and for that purpose, the nozzle diameter must be changed, and it is difficult to change the nozzle diameter steplessly. As another means, if the nozzle diameter is left as it is, the air supply is intermittently performed, and if the ratio of the total air supply amount within a fixed time is roughly in accordance with the mixing ratio, each of the air sprays actually The ratio of powders will also be sprayed accordingly.

As mentioned above, the simplest means for intermittently supplying air is to use an electric pulse signal. If a commercially available pulse controller (6) and solenoid type air valves (5A, 5B, ...) Are used, the cycle and interruption time of these pulse signals can be easily changed in millisecond units. By selecting and setting the numerical values of these pulse signals, it is possible to set a fine mixing ratio.

As described above, the atomized particles of the powder particles which are sprayed and mixed at a predetermined mixing ratio are pushed to the lower part in the semi-enclosed funnel container (1), and at the same time, the negative pressure applied to the same part. The powder is pulled out to the outside by the gas, and is introduced into the gas-powder separation device (8) which is the source of the negative pressure and separated from the gas to obtain a mixture (AB) of powder particles.

Next, an apparatus based on the above method will be described. Also second
See figure. An open / close lid (12) is attached to the upper lid of the semi-enclosed funnel-shaped container (11), and a plurality of powder and granular material ejectors (13A, 13B, ...) Are attached to the side walls, and Nozzle for powder ejector (17A, 17B,…)
Are mounted such that their centerlines are generally centered. The outside of the air ejecting port (14A, 14B, ...) in the above-mentioned powder ejector (13A, 13B, ...) Is the powder suction pipe (15A, 15B, ...).
And each tube is covered with a powder hopper (18A,
18B, ...). Then, the powder ejector (13
The pressurized air pipes (20A, 20B, ...) to A, 13B, ...) are connected to the pressurized air generator (25) via the air flow rate control valves (24A, 24B, ...), respectively. 20A, 20B, ...) Air-operated air valves (11A, 11B, ...) Are provided along the way. In the above method, a solenoid type air valve is provided in place of the air operated type air valve, but in reality, the pressure of the pressurized air is relatively high, so it seems that the air operated type air valve is often used. . The operation air pipes (30A, 30B, ...) For the air operated air valve are connected to the operation air generator (35) through the air flow rate adjusting valves (32A, 32B, ...), but the pipes (30A, 30B, ...) ) A solenoid type air valve (31A, 31B, ...) Is provided along the way. The solenoid type air valves (31A, 31B, ...) Are electrically connected (39A, 39B, ...) To the pulse controller (40). On the other hand, the lower part (11b) of the funnel-shaped container (11).
The straight pipe (11h) of the
0), which is provided with a gas suction device (57). In the figure, a back filter type is shown as the air-dust separating device. An accumulation container (59) for a mixture of powder and granules is placed below the air-dust separating device (50).

[Action]

The operation of the device of the present invention will be described. See the same FIG. A single type of granular material (A, B, ...) Is replenished in the granular material supply hopper (18A, 18B, ...) Of each granular material ejector (13A, 13B, ...). Next, the set pulse signal is transmitted from the pulse controller (40). As an example, the pulse signals are three types for powders A, B, and C. And the cycle is the same 20 cycles,
The mixing ratio of them is A: B: C = 20: 5: 2. The ratio of the supply amount of pressurized (eject) air in this case is also 20: 5: 2 at the same speed. In practice, their ratio varies slightly with the length of the "open" time,
This time we neglect it.

Now, apply these ratios to the pulse signal. See FIG. It is sufficient to set the respective "open" times, that is, 40ms and 10ms in one cycle of 50ms. Depending on the pulse controller, the pulse setting time may be in milliseconds. In that case, since it cannot be set for the time less than or equal to the comma, it may be set as an integer by multiplying it by a required multiple. For example, if the mixing ratio is 40: 20: 1.5
It can be doubled by 1.5 to open every 3 ms for 3 ms and open for 40 ms and 20 ms every other cycle (see the line for C'powder in the figure).

When the pulse signal transmitted by the pulse controller is set as described above, the signal first activates the solenoid type air valves (31A, 31B, ...) And opens. Since the pressure of the operating air (0A) is applied to the valve, the operation air (0A) is opened by opening the operating air valve (21A, 21A).
B, ...) is reached and the valve (22A, 22B, ...) is opened. Since this valve receives pressurized air from the pressurized air generator (CA), the pressurized air (CA) enters the air ejection port in the particulate ejector, and pressurized air is ejected from the ejection port. Then, the powder particles (A, B, ...) around it are sucked and sprayed from the powder particle ejector nozzles (17A, 17B, ...) into the semi-enclosed funnel-shaped container (11). . The stream of spray collects in approximately the center of the vessel (11), where they collide and reflect. That is, the various particles in the form of fumes are dispersed and are mixed with each other by the turbulent flow generated. The fumes mixed in this way are pushed downward in the funnel-shaped container (11) by the subsequent air spray, and at the same time, at the lower part of the container (11), the intake device (50) of the air-dust separator (50) ( Since a negative pressure is applied by 57), these mixed fumes are drawn out of the container (11). Then, it is introduced into the air-dust separating device (50) to obtain a mixture ABC of powder and granules.

〔Example〕

(1) The shape of the spray pattern of the granular material described in the section of the method of the present invention is generally a conical shape,
As shown in FIG. 4, it is formed into an elongated conical shape. In such a spray pattern, the velocity of the spray, that is, the jet flow, is higher than in the case of the above general conical shape, and when they collide, a larger collision force is generated and the reflected flow due to the collision force becomes larger. It spreads widely and widely in all directions, increasing the degree of dispersion of powder particles.

(2) As shown in FIG. 5, the spray pattern is
It is shaped like a fan. Since the tips of the two fan-shaped spray patterns collide in a state where they are in the same phase, when they collide vertically as shown in the figure, the diffusion flow of the collision plate is divided into right and left and diffuses.

(3) Third Embodiment As shown in FIG. 6, the spray pattern has a cross-shaped cross section. When these are made to collide with each other in phase with each other, the diffusive flow of the impingement plate is generated not only on the left and right sides of the fan-shaped spray pattern, but also on the upper and lower sides.

(4) Fourth Embodiment An air-operated air valve is removed in the middle of piping of pressurized air to the powder and granular material ejector in the above apparatus, and instead,
A solenoid type air valve is provided and the valve is electrically connected to the pulse controller. In this example,
It is suitable when the volume of pressurized air is relatively small and a solenoid air valve with a small volume is sufficient.

〔effect〕

According to the method and the apparatus thereof according to the present invention, it is possible to easily set and adjust a plurality of types of powder and granules even in a mixing ratio of a trace value,
It is possible to easily obtain a mixture of powder and granules by uniformly dispersing these in a shorter time and by a simple method and apparatus.

[Brief description of drawings]

FIG. 1 is an explanatory view of the method of the present invention (all of which will be omitted from the present invention hereinafter). FIG. 2 is a side view of the apparatus. FIG. 3 is an example of spray time of three kinds of powder and granules. Is a slender cone-shaped perspective view of the spray pattern. FIG. 5 is also a fan-shaped perspective view. FIG. 6 is a cross-shaped perspective view of the pattern. Explanation of main symbols 1,11 ... Funnel-shaped container, 3A, 3B, 13A , 13B ... Powder and granular ejector, 5A, 5B, 31A, 31B, 31C, ... Solenoid air valve, 6,
40 ... Pulse controller, 8,50 ... Powder separation device, 21A, 21
B, 21C, ... Air operated air valve, 25 ... Pressurized air generator, 35 ... Operation air generator, 57 ... Intake device

Claims (7)

[Claims] 1. A pulse controller transmits a plurality of pulse signals set on the basis of a required mixing ratio, and the respective pressurized air is intermittently fed in accordance with the pulse signals via respective solenoid type air valves. , A spray of air and powder that guides them to their respective particle ejectors into a semi-enclosed container, where the ends of the sprays collide with each other to mix, and a fog consisting of a mixture of these different particles. The body is pulled out from the lower part of the semi-enclosed container, the gas is separated by introducing it into a gas-powder separation device, and a mixture of different powders and granules is obtained. And its mixing method. 2. The method for setting and adjusting the mixing ratio of powder and granules according to claim 1, wherein the spray pattern has a conical shape. 3. A method of setting and adjusting a mixing ratio of powder and granules according to claim 1, wherein the spray pattern has an elongated conical shape. 4. The method for setting and adjusting the mixing ratio of powder and granules according to claim 1, wherein the spray pattern has a fan shape and the cross section has a spindle shape. 5. The method for setting and adjusting the mixing ratio of powder and granules according to claim 1, wherein the spray pattern has a cross-shaped cross section. 6. A semi-closed funnel-shaped container provided with an opening / closing lid on the upper lid, and a straight pipe connected to the outside at the bottom of the container; b. Side wall of the container. A plurality of particle ejectors are installed at a substantially equal angle when viewed in a plane, and the center lines of the particle ejectors are gathered approximately in the center of the container, and c. A solenoid-type air valve is provided on each supply air pipe to the body ejector, d. Each solenoid-type air valve is electrically connected to a pulse controller, and e. The straight pipe provided is connected to an air-dust separation device with an air intake device by piping, and the setting and adjustment of the mixing ratio of the powder and granules and the mixing device thereof. 7. An air-operated air valve is provided on each pipe to a plurality of powder-and-particle ejectors, and a solenoid-type air valve is provided for supplying operating air to the air-operated air valve, and 7. The apparatus for setting and adjusting the mixing ratio of powder and granules according to claim 6, wherein a solenoid type air valve is electrically connected to the pulse controller.