JPH06143252A - Cylindrical mixer - Google Patents

Abstract

PURPOSE:To provide a cylindrical mixer which can completely mix macroscopically and microscopically and be used, for example, to mix high viscosity foamed silicone. CONSTITUTION:A plurality of agitators 13 are provided on a shaft of a rotor 8, and partitioning members 18A, 18B for partitioning the agitators 13 are fixed to a chamber 7 side. Gaps between the members 18A, 18B and the agitator 13 are small. Small pores 20 are formed at the members 18A, 18B, and a material to be fed therefrom is cut by the agitators 13. In this case, a rotor 8 is rotated at a low speed to suppress heat generation to a low value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical mixer useful for mixing two liquids of resins.

[0002]

2. Description of the Related Art For example, in coating or injecting a silicone resin, AB2 liquid is mixed by a mixer and the mixed liquid is discharged from a nozzle. With this kind of mixer,
In order to efficiently perform mixing, coating, or injection, it is formed in a tubular shape and designed integrally with the nozzle.

5 and 6 show an example of a conventional cylindrical mixer. The cylindrical mixer MX1 shown in FIG. 5 rotates a rotor 3 in a cylindrical chamber 2 having a nozzle 1 at its tip. The AB2 liquid is supplied under pressure from the holes provided at the upper end of the mixer. A screw for pressurizing and supplying the AB2 liquid may be provided above the rotor 3. In this cylindrical mixer MX1, since the rotor 3 rotates in the cylindrical chamber 2, the AB2 liquid is appropriately stirred and discharged from the nozzle 1. On the other hand, in the tubular mixer MX2 shown in FIG. 6, the stirring portions of the rotor 4 are arranged at a distance from each other, and the projections 6 are extended from the chamber 5 between them. The protrusions 6 are provided to prevent the mixture from passing through the wall surface of the chamber 5.

[0004]

However, the conventional cylindrical mixer as described above has the following problems.

First, in the mixer MX1 shown in FIG. 5, since the passage for allowing the mixed liquid to pass through is formed in the inner surface of the chamber 2, the nozzle 1 will be constructed no matter how the rotor 3 is constructed.
Partially unmixed liquid is discharged from. Therefore, there is a problem in that it is difficult to use when sufficient mixing is required such as when mixing a foaming agent into resin.

Further, in the mixer MX2 shown in FIG. 6, although the projection 6 is provided on the inner surface of the chamber 5 to prevent direct passage of the mixed liquid, this is because the unmixed liquid flows along the inner surface of the chamber 5. The structure is such that it does not directly pass through. When viewed in plan, the blades of the rotor 3 and the protrusions 6 are
There is a problem that a large gap is always generated between the nozzle and the nozzle, and the incomplete mixture is inevitably discharged.

Incidentally, the above-mentioned mixers MX1, MX
When two liquid silicone foams are mixed and foamed in 2, foaming is incomplete due to incomplete mixing, resulting in a mottled continuous foam F1 as shown in FIG. Further, since the foamed particles are aggregated and the surface is solidified, the product becomes defective.
FIG. 8 shows a foam F2 having regular closed cells.

Further, the mixers MX1, MX as described above
In the case of No. 2, since the structure was basically expected to have the liquid stirring action by the rotation of the rotor 3, there was a problem that the number of rotations was large (for example, 2400 RPM) and the heat generation was large. When the heat generation becomes large, the thermosetting resin is accelerated in curing, and an excessive cooling facility is required to prevent this. Further, in the case of a foamable resin, the foaming start time after liquid discharge is shortened, and in some cases foaming is started in the chamber.

The various problems described above are promoted as the viscosity of the mixed solution increases. This is because if the viscosity becomes high, the mixed solution will rotate together with the rotor and sufficient mixing cannot be obtained.

An object of the present invention is to provide a cylindrical mixer which solves the above-mentioned problems and can perform sufficient mixing even if the viscosity is high, and can suppress the heat generation by lowering the rotor rotation speed. To do.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the present invention comprises a cylindrical mixer as set forth in the claims.

[0012]

In the tubular mixer of the present invention, a plurality of agitating parts with cutting parts are provided at predetermined intervals on the shaft of the rotor, and a plurality of partitioning members for partitioning the agitating parts are provided in the chamber. Since the member was provided with a small hole for sending the mixed liquid stirred in the previous stage stirring unit to the next stage, the mixed liquid extruded from the small hole was cut off in the next stirring unit, and the stirring action of the stirring unit was performed. After being obtained, it is extruded into the next small hole. Therefore, the mixed solution is repeatedly cut, stirred, and passed through the small holes a plurality of times, and the incompletely mixed portion does not pass through. Also,
Since only a small gap exists between each stirring part and each partition member, sufficient polishing can be performed here, and a large grain unmixed portion may not pass through each small hole. Microscopically complete mixing is possible.

In the positional relationship of the small holes, if the partition members adjacent to each other are displaced from each other, regardless of the structure of the stirring section, the mixed liquid that has passed through the previous small hole is transferred to the next small hole. The possibility of being sent as is can be reduced.

The shape of the stirring portion can be freely designed, but a structure (for example, a cross shape) in which rod-shaped members having a square cross section are radially arranged with respect to the axis of the rotor is sufficient.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a cylindrical mixer according to an embodiment of the present invention. FIG. 2 is an enlarged plan view showing the shape of the stirring section. Figure 3
4 and FIG. 4 are enlarged plan views of the partition plate.

In FIG. 1, a cylindrical mixer MX3 of this example is shown.
Is provided with a rotatable rotor 8 in a cylindrical chamber 7. The outer shape of the chamber 7 is formed in a quadrangle, and the chamber 7 is divided into two and joined by bolts. The nozzle 10 is joined to the tip of the chamber 7.
Reference numeral 11 denotes a water cooling hole for flowing cooling water.

The rotor 8 is constructed by mounting a plurality of blades 13 as a stirring unit on a rotor shaft 12 at predetermined intervals. The shaft 12 of the rotor 8 is connected to the rotating shaft 15 of the stirring motor 14. A material supply chamber 16 is formed above the rotor 8, and channels 17A and 17B for supplying AB2 liquid are formed in the chamber 16. The AB2 liquid of this example has a viscosity of 15,000 to 40.
It is assumed to be the main agent and curing agent of foamed silicone of 0000 CP.

The structure of the blade 13 is shown in FIG. As shown in the figure, the blade 13 of this example is configured by attaching four square rods 13-1 to 13-4 to the shaft 12 of the rotor in a cross shape. The blade 13 has a thickness of about 2 to 5 mm.

On the other hand, in the chamber 7, a ring-shaped groove is cut at an intermediate position between the blades 13 adjacent to each other, and a pair of divided disks (discs) are fitted into the groove as partition members. There is.

A disc divided into two parts is shown in FIGS. As shown in FIGS. 3 and 4, the disc 18 has a small hole 2
Two types are formed in a semi-circular shape depending on the presence or absence of 0, and one disc 18 is formed by combining those with small holes 20 18A and those without 18A. In this example, the number of small holes 20 is three.

In FIG. 1, discs 18A and 18B having small holes 20 and discs 18B without small holes 20 are alternately arranged from the top in FIG. Disk 18B or 18A
Are arranged. Therefore, in this example, the positions of the small holes 20 are displaced in the upper and lower discs, the small holes do not appear on a straight line, and there is no possibility that the material passes through. Assembly is done by dividing one chamber 7
The discs 18A and 18B are alternately inserted into the grooves of the discs, and the discs to be paired with the discs 18 are inserted in the other chamber 7.
Insert B and 18A, and connect both chambers with bolts. The disk 18 is made to have a thickness of about 2 to 5 mm.
The space between the blades 13 and the disk 1 arranged between them
The difference from the thickness of 8 is about 1 mm (up and down by 0.5 mm) or less. The size of the small holes is 2-5 mm in diameter.

In the tubular mixer MX3 having the above-described structure, the motor 14 is rotated so that the passages 17A and 17B are connected to the AB channel.
When the two liquids are supplied under pressure, the material (mixed liquid) is sent from the upper part of the rotor 8 to the nozzle 10 via the material supply chamber 16. The mixed liquid is first roughly kneaded in the upper portion of the rotor 8 where the disc 18 is not arranged, and the incomplete mixed liquid is supplied to the portion where the first disc 18 is located. At this time, the cross-shaped blades 13 shown in FIG. 2 are rotating together with the rotor shaft 12. Rotor speed N of rotor 8
Is used at a considerably low speed and is generally used at 50 to 1000 RPM, but the rotation speed varies depending on the type of liquid, viscosity, feed rate, and size and shape of blades and disks. Here, it is assumed to be 70 RPM.

The mixed liquid reaching the first disk 18 is
While being mixed, it passes through the small holes 20 and is cut by the blade 13 in the next stage. The cutting amount Pmm is the material feed rate at the small hole 20 is Lmm.
/ Sec, there is a relationship of P = 60L / (4 × N). Numerical value 4 indicates the number of constituent blades 13 of one set. If L = 1 and N = 70, then P≈0.214 mm. That is, if the cutting amount P exceeds the thickness d of the blades 13, the mixed liquid may pass through one small hole 20 to the next small hole 20, so that the relationship between the feed speed and the rotor rotational speed depends on the cutting amount P.
To be as small as possible. For this,
When the feed amount (ejection amount) is large, it can be dealt with by increasing the rotation speed N. Further, it can be dealt with by increasing the diameter or number of the small holes 20, or by increasing the number of the blades 13. However, when the number of rotations of the rotor 8 is increased, the amount of heat generated is also increased.

The mixed liquid cut by the blade 13 partially passes through the gap C (0.5 mm) between the blade 13 and the disk 18, and partially does not pass through the gap C and is mixed inside the blade 13. While passing. Then, in the same procedure as that described below, the pieces are cut, stirred, and sent out toward the nozzle 10. Assuming the worst condition, it is considered that the incomplete mixed liquid is successively sent to the small holes 20 without being mixed by the blades 13, but in this example, the mixed liquid sent out from the six disks is 0.1 to 0. Since it will be cut 6 times with a size of about 5 mm, the final mixed solution will be considerably small particles.

With the above operation, the mixed liquid sent to the rotor 8 is abraded in the gap C between the blade 13 and the disk 18 by the rotation of the blade 13, mixed by the rotation of the blade 13 and further into a small hole. Since the cutting with the blades 13 via 20 is repeated, the mixed liquid arriving at the nozzle 10 is macroscopically and microscopically uniformly mixed. When the rotational speed N and the feed speed L of the rotor 8 are optimized and mixed to foam the silicone foam, a sufficient mixing result is shown in FIG.
It is possible to perform ideal foaming as shown in (3), and it is possible to continuously discharge the two-liquid material that requires high stirring efficiency.

Further, since sufficient stirring can be obtained at low rotation, the temperature of the material does not rise and it is not necessary to heat the material to lower the viscosity, so that the gel time and rise time become long, and it is easy to introduce as production equipment. . Further, since the shaft rotation is low, the life of the shaft seal packing is extended.

In the above embodiment, the blade 13 is made of a rod-shaped material having a square cross section, but this shape can be modified in various ways such as a round shape, a star shape, and a vane shape. However, as described above, since the blades 13 have a function of cutting the mixture sent out from the small holes of the disk 18, it is preferable that the surface in contact with the small holes 20 has an edge shape.

Further, in the above-mentioned embodiment, the disc is divided structure and the small holes 20 are provided only on one side to shift the small hole positions of the adjacent discs. However, depending on the feeding speed of the mixed liquid, the mixed liquid may be changed. Is unlikely to pass through the small holes at the same position, and in such a case, the small holes 20 may be at the same position. Further, although the shape of the small hole 20 is shown as an example of a round hole, this may be an ellipse, a slit, or another shape.

The present invention is not limited to the above embodiments, but can be carried out in appropriate modes by making appropriate design changes.

[0030]

As described above, since the present invention is the cylindrical mixer as set forth in the claims, the material cutting and stirring action of the stirring section and the polishing action between the stirring section and the partition member are performed. The materials can be completely mixed macroscopically and microscopically, and safe mixing can be efficiently performed with low heat generation. The tubular mixer of the present invention is particularly suitable for mixing high-viscosity materials, which have hitherto been considered difficult, but has a higher stirring efficiency than conventional ones even for low-viscosity materials.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cylindrical mixer according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing the shape of a stirring section (blade) of the cylindrical mixer.

FIG. 3 is an enlarged plan view showing one of the divided structures of the partition member (disk) of the cylindrical mixer.

FIG. 4 is an enlarged plan view showing the other one of the division structures shown in FIG.

FIG. 5 is an explanatory sectional view showing an example of a conventional tubular mixer.

FIG. 6 is a cross-sectional explanatory view showing another example of the conventional tubular mixer.

FIG. 7 is an explanatory view showing a cross-sectional structure of a foamed body using a conventional mixer.

FIG. 8 is an explanatory view showing a cross-sectional structure of a regular foam.

[Explanation of symbols]

 8 rotor 12 rotor shaft 13 blades (stirring part) provided on the rotor 18 disc (partitioning member) 20 small holes

Claims (3)

[Claims] 1. A cylindrical chamber and a rotor that rotates in the chamber with its axis aligned with the center line of the cylinder, and agitates the material fed from one direction by the rotating operation of the rotor. In a cylindrical mixer which is fed in the other direction, a plurality of stirring portions are provided on the shaft of the rotor at predetermined intervals, and the chamber is provided with a partition member that partitions the stirring portions with a slight gap therebetween. The partition member is provided with an appropriate number of small holes for feeding the material stirred in the previous stage stirring section to the next stage, and in the stirring section, the material fed out from the small holes is sequentially cut into short dimensions. A cylindrical mixer having a cutting part. 2. The cylindrical mixer according to claim 1, wherein the agitating unit is formed by radially disposing a plurality of rod-shaped members with respect to a shaft of the rotor. 3. The cylindrical mixer according to claim 1, wherein the small holes provided in the partition member are displaced from those in the front stage or the rear stage.