JPS6119786Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a gravity drop mixing device for powder and granular materials using a mixing tank.

BACKGROUND ART Various systems and devices have been conventionally provided for mixing apparatuses that accommodate powder and granular materials having different physical properties in a mixing tank and discharge them as a desired mixed powder and granular material from the bottom of the mixing tank.

In other words, a plurality of vertical pipes each having an ejection opening of a different height are installed in a mixing tank, and pressurized air is supplied to these pipes, and the powder and granules in the lower part are ejected upward together with the pressurized air, thereby discharging the powder in the tank. There is a method of stirring and mixing the granules, and a large number of extraction holes are drilled in various directions and locations on the pipe wall of a large number of extraction tubes arranged in a mixing tank, and the extracted granules are discharged from the extraction holes. A typical example is to collect the mixture in a chamber and circulate it several times to achieve the purpose of mixing.

However, in the former case, in addition to the complexity of the structure in which a large number of ejection pipes are provided in the mixing tank, the power required to consume a large amount of pressurized air is large. It has the disadvantage of causing frequent damage.

In the latter case, a large number of extraction tubes and bleed holes are required in order to averagely extract from all of the accumulated powder and granules, which inevitably complicates the structure, and the number of individual extraction holes When the opening area is small, the inflow of powder from the extraction hole tends to become unstable due to cross-linking phenomena, etc., and mixing for powder is considered impossible. It can be said that there are no examples of practical application of powder.

Such conventional technology has tended to prioritize the pursuit of mixing precision over economic efficiency, but in recent years, with the improvement of quality uniformity in the production process, it has become relatively easier to obtain the desired mixing precision. Rather, the focus is now on reducing manufacturing and construction costs and saving energy.

In order to meet these demands, the present invention is an extraction type gravity drop type device with a simplified structure that does not require power for circulation operation and is a one-through type device that only supplies from above and discharges from below. It is an object of the present invention to provide a simple and inexpensive mixing device for powder and granular materials that achieves the desired mixing precision and can be applied particularly to mixing not only granules but also powders.

In other words, the device of the present invention has an inner cylinder that stands upright at the center of the mixing tank, and one or more funnel-shaped socket hoppers that communicate internally with the inner cylinder, and each socket hopper. An extraction control cover is provided with one or more extraction openings drilled on the upper slope, and an opening adjustment plate for adjusting the opening area of the extraction openings is rotatably stacked on the opening surface as desired. It was formed by

In addition, the lower slope angle of the receiving hopper is θ1, the upper slope angle of the extraction control cover is θ2, the diameter of the mixing tank body is D0, and the outer end diameter of the extraction opening is D1, D2, respectively when the receiving hoppers are provided in two stages, upper and lower. The total area of each opening adjusted by the opening adjustment plate is Σa1,
When Σa2 and the cross-sectional area of the inner cylinder are A1 and A2, respectively, it is configured so that 30° < θ1, θ2 < 70° D1, D2 < 1/2 × D0 Σa2 < 2 × A2 (Σa1 + Σa2) < 2 × A2 It is characterized by the fact that

To explain the present invention using an embodiment and drawings, FIGS. 1 and 2 are side sectional explanatory views, and FIG. 1 is a drawing for explaining the structure and FIG. 2 is a drawing for explaining the operation. be.

In FIG. 1, the main body of the mixing tank 1 is cylindrical and has a supply port 7 at the top, and an inverted conical cone section 9 at the bottom.
It has approximately the same appearance as a normal storage tank with a discharge port 10 at the lower end.

The inner cylinder 2 is vertically suspended from the center of the mixing tank 1 by an appropriate means, and a funnel-shaped socket hopper communicating with the inner cylinder 2 is provided at a predetermined position of the inner cylinder 2. 3, and an extraction control cover 5 having one or more extraction openings 4 formed on its upper slope.

Further, the extraction opening 4 of the extraction control cover 5 is provided with an opening adjustment plate 6 having an opening corresponding to the extraction opening 4 so as to be able to be opened and stacked on the upper slope thereof.
(In the figure, the attached state is shown in the lower part.) In the figure, the anti-segregation device 8 is shown in the cone portion 9, but this may be provided as desired.

A damper, rotary leaf eater, or the like (not shown) is connected to the discharge port 10.

Next, to describe the operation of this device, from the supply port 7 of the mixing tank 1 storage section, approximately the same amount of powder and granules as the total amount of continuous discharge from the lower end discharge port 10, which will be described later, is successively fed into the tank. is deposited and filled to a certain level.

On the other hand, the granular material in the area surrounded by the collapse angle indicated by the dotted line in Fig. 2 flows into the receiving hopper 3 in a fixed amount from the extraction opening 4, and the inflowing granular material is always in a sparse state. It rapidly falls into a certain inner cylinder 2 and reaches the discharge port.

The powder and granules that did not flow into the extraction opening 4 gradually settle in the tank as they are discharged from the lower part, but the powder that has a completely different phase quickly falls inside the inner cylinder 2 and reaches the discharge port. It merges with the granules to perform the desired mixing action.

In addition, the opening adjustment plate 6 is normally fixed, and can be rotated to adjust the discharge amount as necessary when there is a change in the particle shape or properties of the target powder or granular material. do.

As described above, the device of the present invention has a very simple structure and does not require a series of bleed pipes as in the conventional device, nor does it have a blower or circulation device, and therefore does not require a power unit.

However, in order to obtain the above-mentioned mixing action with such a simple structure and the desired mixing precision in a one-through method, the shape, properties, processing amount, and Depending on the desired mixing accuracy, the body diameter and height of the mixing tank, the size of the inner cylinder, the position of the receiving hopper, the angle of the upper and lower slopes, the opening area of the extraction opening and the outer end diameter of the opening, etc. Needless to say, it must be designed in accordance with paragraph 3 of the registered claims, but in addition to this, the following considerations must be taken into consideration when designing.

For example, when the extraction amounts from the upper and lower extraction openings are expressed as w1 and w2, and the amounts of G1, G2, and G3 grade deposits in each layer are expressed as W1, W2, and W3, respectively, w1=w2=0.33×W1=0.33 ×W2 = 0.33×W3 If the entire amount of powder and granular material accumulated in mixing tank 1 is paid out and discharged, approximately 1/3 of the total amount accumulated in the mixing tank will be discharged from the bottom end from a global perspective. When the amount of discharge falling from the opening between the bottom discharge port and the inner cylinder of the mixing tank is expressed as w3, w1=w2=w3, and G1:G2:G3=w1: w2:w3≒0.33:0.33:0.33
Therefore, G1, G2, and G3 grades are each 1/3
The mixture with the same mixing ratio will be transferred to the next step.

In addition, as seen in conventional equipment, when a mixing pipe device is interposed between the discharge port and the discharge machine next to the discharge port, such as a rotary feeder, and a discharge method that prioritizes the inner cylinder is adopted, the upper extraction At the point when the amount extracted from the opening decreases or becomes completely absent, the amount of water that falls from the inner cylinder is only w2, and the amount of water that comes out from outside the inner cylinder is that of the mixture that has shifted to w3 + w2 = 2 x w2. is obtained.

Next, at the same time as the falling discharge of the mixing operation starts, an input amount equal to the discharged amount is supplied from the top, and the fallen discharged material is mixed and transferred to the next process in a one-through method. The material is sequentially replaced with the G1 grade lot in the upper layer, extracted from the upper extraction opening, and then rapidly dropped down the inner cylinder and discharged, resulting in the same mixing ratio from beginning to end.

The effects of the device of the present invention are as follows.

(1) Because it uses a one-through method and has a simple structure, it is easy to use a microcomputer to create an accurate design for a variety of cases.

(2) The socket hopper 3 can be enlarged to nearly 1/2D0 without being restricted by the diameter of the inner cylinder 2 (1/2
(It is meaningless to make it larger than D0.) Therefore, the target extraction range can be freely selected.

In addition, by installing the extraction control cover 5, it is possible to select θ1 and θ2 at angles that do not cause accumulation or sedimentation in the powder or granular material in accordance with the angle of repose, regardless of the required extraction amount.

In this case, by appropriately selecting the properties of the powder, the total opening area Σa1, Σa2 of the extraction opening 4 (or the opening adjustment plate 6), and the above-mentioned slope angles θ1, θ2, it is possible to Based on the principle that the amount of incoming extraction of
If the opening cross-sectional area or inner cylinder cross-sectional area is set under the condition of a1 + Σa2) < 2 × A1, the inner cylinder will not be filled with extracted powder and granules, and the inflowing powder and granules will always be in a sparse state. can fall rapidly.

In other words, this structure can sufficiently cope with mixing targeting the segregated layer falling from the periphery of the mixing tank, and also makes it possible to ensure quantitative extraction of powder.

(3) The ratio of extraction amounts in each extraction section can be freely selected, and the extraction amount in each section can be easily adjusted in accordance with the lot amount of each grade of the target powder or granule.

(4) It is extremely easy to wash the mixing tank, inner cylinder, and other parts with water, and the effect is accurate.

In other words, there is no risk of contamination when handling different types of powder or granular materials.

(5) Sequential continuous loading, dropping discharge, and mixing are performed in a one-through manner, and transfer to the next stage process is ideally performed.Also, the entire amount of contents in the tank can be discharged and mixed without top loading and transferred to the next stage process. Also, the mutual mixing of each layer in the mixing tank is carried out appropriately.

In addition, this device has the advantage of being economically simple in structure, resulting in low construction costs, being a one-through system, which shortens the time required for the mixing process, and requiring no power at all.

[Brief explanation of the drawing]

Both FIG. 1 and FIG. 2 are side sectional explanatory views of an embodiment of the device of the present invention, and FIG. 1 shows the structure,
Moreover, FIG. 2 is a diagram explaining the action. 1...Mixing tank, 2...Inner cylinder, 3...Socket hopper, 4...Extraction opening, 5...Extraction control cover,
6... Opening adjustment plate, 7... Supply port, 8... Segregation preventer, 9... Cone portion, 10... Discharge port.

Claims (1)

[Scope of Claim for Utility Model Registration] In a mixing device that sequentially supplies powder and granules from the top of a mixing tank and discharges them as a desired mixed powder and granules from below, One or more funnel-shaped socket hoppers 3 are provided in the middle of the cylinder 2 and the inner cylinder 2 and communicate internally with the inner cylinder 2, and one or more socket hoppers 3 are provided on the upper slope of each socket hopper 3. A gravity drop mixing device for powder and granular materials, characterized in that an extraction control cover 5 with an opening 4 is provided. (2) An opening adjustment plate 6 having an opening corresponding to the extraction opening 4 is placed over the upper or lower surface of the opening surface of the extraction opening 4 of the extraction control cover 5 in the registered claim 1. A gravity fall mixing device for powder and granular material, characterized in that the opening area is adjusted to adjust the opening area. (3) In the first registered claim, the angle of the lower slope of the receiving hopper 3 is θ1, the angle of the upper slope of the extraction control cover 5 is θ2, and the diameter of the body of the mixing tank 1 is
D0, the outer end diameter of the extraction opening 4 on the conical surface of the extraction control cover 5 is arranged in upper and lower two stages in the receiving hopper 3.
If D1, D2 and opening adjustment plate 6 are provided, respectively.
The total area of each opening adjusted by Σa1, Σ
When a2 and the cross-sectional area of the inner cylinder 2 are A1 and A2, respectively, 30° < θ1, θ2 < 70° D1, D2 < 1/2 × D0 Σa2 < 2 × A2 (Σa1 + Σa2) < 2 × A2 A gravity fall mixing device for powder and granular materials.