JPH08131799A - Mixing device of powder/granule and liquid - Google Patents

Abstract

PURPOSE: To provide a mixing device which is almost free from a large deposit of a mixture of materials on a screw, can be easily cleaned and is manufactured at a low cost. CONSTITUTION: A mixing device of powder/granule and liquid consists of a hopper 4 opened on the inlet side of a mixing pipe 2 incorporating a screw 1 which is driven to rotate, for supplying powder/granule, and a feed pipe 5 for feeding liquid to the position of an outlet side from the opening of the hopper 4. Further, the screw 1 is composed of a coil spring 1a. In addition, the winding pitch of the coil spring 1a at the outlet side of a mixing pipe 5 is wider than that at the inlet side with a point which is slightly closer to the hopper 4 side than the opening point of the mixing pipe 5 as a boundary P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mixing powder and granules with a liquid.

[0002]

2. Description of the Related Art Conventionally, various types of devices have been known as devices for continuously mixing powdery particles and liquid at a constant ratio.
As the most typical example, a hopper that supplies powder and granules is opened at the inlet side of a mixing tube having a screw that is driven and rotated, and a liquid that is supplied at a position on the outlet side from the opening point of the hopper is supplied. An example is a mixing device with an open tube.

[0003]

However, since the screw used as the extrusion means in this mixing device is composed of a so-called screw shaft formed in a spiral on the peripheral surface of the shaft, the material cost is reduced. The cost of the equipment will increase due to the cost of precision processing, and if the liquid to be transferred is, for example, a curable synthetic resin polymer, the cleaning work of the equipment after the mixing operation will be completed. In addition to requiring a considerable amount of time, the amount attached to the screw shaft and discarded is also relatively large, which hinders effective utilization of expensive synthetic resin polymers.

In view of these drawbacks, the present invention has made extensive studies as a result of solving the problems. As a result, the screw is composed of a coil spring, and the winding pitch of the screw is a little closer to the hopper side than the opening point of the supply pipe. By providing a larger size on the outlet side than on the inlet side of the mixing pipe with the approaching point as a boundary, it is possible to satisfactorily mix the powder and granules and the liquid, and It was found that an inexpensive mixing device that can easily wash the screw can be obtained.

[0005]

That is, the mixing apparatus for powder and liquid according to the present invention opens a hopper for supplying powder and granules to the inlet side of a mixing pipe having a screw which is driven and rotated. Along with, in the mixing device of the powder and granules which opens the supply pipe for supplying the liquid to the position on the outlet side from the opening point of the hopper, the screw is constituted by a coil spring, and the winding pitch of the coil spring is set. It is characterized in that, at a point slightly closer to the hopper side than the opening point of the mixing tube, the exit side of the mixing tube is formed larger than the entrance side of the mixing tube.

Further, the winding pitch of the coil spring formed on the outlet side of the mixing pipe is preferably set to be 1.5 to 4 times larger than the pitch of the coil spring formed on the inlet side. The material that forms the coil spring is
A material which is not chemically affected by the object to be mixed and transferred and which is usually spring steel whose surface is treated by chrome plating or the like is used, but stainless steel, titanium alloy or the like can be used. Further, the size of the coil spring is designed so that the mixture of the powder and granules and the liquid can be stirred and mixed and transferred, and the strength is such that the pitch does not change significantly during this operation. .

A coil spring having a circular cross section is mainly used, but a square with rounded corners, a triangle with rounded corners, a flat bar with rounded corners, and a mixed shape in which these are partially arranged are used. It can be appropriately used depending on the properties of the mixture.

[0008]

[Operation] In FIG. 1, a screw 1 composed of a coil spring 1a is arranged in a mixing pipe 2,
When this screw 1 is rotated via the drive shaft 3 to which one end of the coil spring 1a is fixed, the granular material supplied from the hopper 4 is quantitatively transferred in the direction of the arrow in the figure, and then supplied from the supply pipe 5. Is mixed with a fixed amount of liquid.

At this time, the winding pitch of the coil spring 1a is on the outlet side of the mixing pipe 2 with respect to the inlet side of the mixing pipe 2 at a point P slightly closer to the hopper 4 side than the opening point of the supply pipe 5. Since it is larger, it is possible to mix well and to discharge such a mixture from the outlet 6. When cleaning the screw 1, the screw 1 constituted by the coil spring 1a can be easily pulled out from the inlet 7 of the mixing tube 1 while holding the drive shaft 3. Further, since the screw 1 is composed of the coil spring 1a, the attached matter can be easily removed.

[0010]

[Embodiment] An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a mixing device for mixing powder and liquids. The discharge port 4a of the hopper 4 is provided at the inlet side of the mixing pipe 2 (cylinder part), and the supply pipe is provided from the discharge port 4a to the delivery end side. 5 are opened respectively. Then, the screw 1 constituted by the coil spring 1a is loosely inserted into the mixing tube 2 (it is loosely fitted to the inner surface of the mixing tube 2 with a gap), and one end of the coil spring 1a is attached. It is fixed to the drive shaft 3.

The drive shaft 3 is connected to an output shaft of a motor (not shown) through a suitable shaft coupling such as a coupling and is driven at a predetermined rotational speed. Further, the hopper 4 is for accommodating the granular material, and is arranged at the inlet side of the mixing tube 2 so as to supply the granular material into the mixing tube 2 first, and then to the delivery end side. A supply pipe 5 is provided to supply and mix the liquid into the granular material.

The coil spring 1a has a function equivalent to that of a screw of an ordinary mixing device, and is located on the inlet side of the mixing tube 2 at a point P slightly closer to the hopper 4 side than the opening point of the supply tube 5. The winding pitch P2 on the outlet side is larger than the winding pitch P1 so that the deformation pitch is larger. An upstream side of the point P is a measuring zone A for transferring the granular material F while measuring it, and a downstream side of the point P is a mixing zone B for transferring the granular material F and the liquid L while mixing. I am configuring.

Therefore, when the coil spring 1a rotates at a constant speed, the powder particles F filled in the hopper 4 are quantitatively transferred in the mixing tube 1 in the direction of the arrow in the figure. Since the winding pitch of the spring 1a is set to the constant pitch P1, the powder or granular material F is transferred while being filled in the mixing tube 2. Then, when the granular material passes through the point P, it is mixed with the liquid L that is quantitatively supplied from the supply pipe 5, but the winding pitch P2 of the coil spring 1a arranged on the outlet side of the mixing pipe 2 from this point P.
However, since it is formed to be larger than the winding pitch P1, the winding pitch is increased, and therefore the speed of the powdery particles to be transferred is increased from here, whereby a space is formed in the mixing tube 2. It will be.

Therefore, the liquid L can be easily supplied to the space from the supply pipe 5 and efficiently mixed. Further, in the mixing apparatus according to the present invention, since the screw 1 is constituted by the coil spring 1a as the mixing / transferring means, there is no corner portion where the mixture adheres and is difficult to remove, so that the adhering amount of the mixture can be reduced. . The winding pitch of the coil spring 1a in the mixing zone B is also a constant pitch P.
Although the pitch P2 is set to be larger than the winding pitch P1, the coil spring 1a contracts due to frictional resistance due to the increase in volume and viscosity due to the supply of the liquid L, and the measuring accuracy is As it deteriorates, tube blockage easily occurs, making stable mixing difficult, and
In the case of a liquid having high viscosity and poor fluidity, the mixing ability is deteriorated, so the mixing pipe 2 and the coil spring 1
This is because a must be provided longer, and the device becomes expensive.

Hereinafter, the screw 1 is washed after the mixing of a predetermined amount, and at that time, the screw 1 can be easily pulled out from the inlet 7 of the mixing tube 1 while holding the drive shaft 3. Since the screw 1 is composed of the coil spring 1a, the deposit can be easily removed by washing or another method. To illustrate specific conditions, the outer diameter of the mixing tube 2 is 60.5 mm, the winding diameter of the coil spring 1 a is 20 mm, the wire diameter of the coil spring 1 a is 4 mm, the length of the measuring zone A is 150 mm, and the coil spring 1 a Using a mixing device having a winding pitch P1 of 20 mm, a length of the mixing zone B of 600 mm, and a winding pitch P2 of the coil spring 1a of 40 mm, a particle size of 3 is used.
A powder F which is a mineral aggregate having a specific gravity of 0.5 and a liquid L which is an epoxy resin having a specific gravity of 1.14 was mixed.

At this time, the coil spring 1a is 100 to
While rotating at 1000 rpm, the liquid was supplied so that the powder F from the hopper 4 and the liquid L from the supply pipe 5 were controlled at a ratio of 5: 1. as a result,
A homogeneous mixture of 1.4-14 kg / min was obtained. Further, the outer diameter of the mixing pipe 2 is 42.7 mm, the winding diameter of the coil spring 1a is 25 mm, and the wire diameter of the coil spring 1a is 4 m.
m, length of measuring zone A is 150 mm, winding pitch P1 of coil spring 1a is 12.5 mm, mixing zone B
With a length of 400 mm and a winding pitch P2 of the coil spring 1a of 25 mm, and a specific gravity of 1.5
Granules F, which is a mixture of silica sand and powder, and has a specific gravity of 1.1
The liquid L which is the epoxy resin of No. 4 was mixed.

At this time, the coil spring 1a is 100 to
While rotating at 800 rpm, the liquid L was supplied so that the powder F from the hopper 4 and the liquid L from the supply pipe 5 were controlled at a ratio of 5: 3. as a result,
A homogeneous mixture of 1.05-8.4 kg / min was obtained. The example of the case where the winding pitch P2 of the coil spring 1a in the mixing zone B is set to be twice the winding pitch P1 of the coil spring 1a in the measuring zone A has been described above. It can be provided up to 4 times.

If the winding pitch P2 is 1.5 times or less than the winding pitch P1, it is not preferable because the metering accuracy is lowered and clogging easily occurs when a high viscosity liquid is used. The transfer rate in the mixing zone B is too high, and the mixing ratio is lowered, which is not suitable. Further, in the present invention, the point which is a little closer to the hopper 4 side than the opening point of the supply pipe 5 is the pipe 5
The maximum distance from the opening point to the hopper 4 side is 50 mm. Further, with respect to the internal installation of the screw 1 constituted by the coil spring 1a with respect to the mixing tube 2, the internal installation may be carried out in any state such as loose insertion, loose insertion, inscribed or the like, but loose insertion is most preferable.

[0019]

EFFECTS OF THE INVENTION In the mixing apparatus for powder and granules according to the present invention, a hopper for supplying the powder and granules is opened at the inlet side of a mixing pipe having a screw which is driven and rotated, and the opening of the hopper. In a mixing device of powder and granules in which a supply pipe for supplying a liquid is opened to a position on the outlet side from a point, the screw is constituted by a coil spring, and a winding pitch of the coil spring is set to an opening of the mixing pipe. At a point slightly closer to the hopper side than the point, a point on the outlet side of the mixing tube is formed larger than that on the inlet side.

Therefore, the powder and granules can be mixed well with the liquid, and since the amount of the mixture adhering to the screw can be reduced during such mixing, the power can be reduced, and moreover, as with a normal screw shaft. Since there are no corners or corners, it is possible to obtain an inexpensive mixing device that can easily wash the screw after mixing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a mixing device for powder and liquid.

[Explanation of symbols]

1 screw 1a
Coil spring 2 Mixing tube 3
Drive shaft 4 Hopper 5
Supply pipe 6 Outlet 7
Entrance A Weighing zone B
Mixing zone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 594188869 Hokengyo Co., Ltd. 3-14 Hanaomote-cho, Atsuta-ku, Nagoya-shi, Aichi (72) Inventor Shigeo Matsumoto 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Passenger Railway Co., Ltd. (72) Inventor Takuro Taguchi 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Passenger Railway Co., Ltd. (72) Inventor Michihiro Ota 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Passenger Railway Co., Ltd. (72) Inventor Masanori Furukawa 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Passenger Railway Co., Ltd. (72) Inventor Noriyuki Igarashi 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Higashi Within Japan Railway Company (72) Inventor Toru Kajita 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Hideyuki Nogami 3-14, Hanaomote-cho, Atsuta-ku, Nagoya-shi, Aichi Stock company, Takaritsu Material Co., Ltd. (72) Inventor ▲ Tetsuo Takagi 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (Akai Building) ) Fuji Industries Co., Ltd. (72) Hideo Nakajima Inventor Hideo Nakajima 3-3-16 Nihonbashihonishicho, Chuo-ku, Tokyo (Nihonbashi Muromachi Building) Toray Engineering Co., Ltd. (72) Inventor Hiroyuki Kimoto Hajime Sonoyama, Otsu City, Shiga Prefecture 1st-1st Toray Engineering Co., Ltd.

Claims (2)

[Claims] 1. A hopper for supplying powder and granules is opened on the inlet side of a mixing pipe having a screw which is driven and rotated, and a supply pipe for supplying liquid to a position on the outlet side of the opening point of the hopper. In an apparatus for mixing powder and granules with an opening, the screw is composed of a coil spring, and the winding pitch of the coil spring is a boundary at a point slightly closer to the hopper side than the opening point of the mixing tube. The mixing device for powder and granules is characterized in that the outlet side of the mixing tube is formed larger than the inlet side thereof. 2. The winding pitch of the coil spring arranged on the outlet side of the mixing pipe at the point slightly closer to the hopper side than the opening point of the supply pipe is the winding pitch of the coil spring arranged on the inlet side. The powder / granule / liquid mixing device according to claim 1, wherein the mixing device is provided in a size of 1.5 to 4 times the winding pitch.