JPS60106522A - Vacuum oscillation mixer - Google Patents

Abstract

PURPOSE:To prevent mixing of air and to improve mixing effect by evacuating a mixing vessel and giving oscillatory movement to a flexible bottom of the mixing vessel. CONSTITUTION:An invertible oscillating frame 2 is supported by a fixing frame 1, and a mixing machine C constructed with a freely flexible bottom part 10 and a rigid upper part 25 is installed to the fixing frame 2. Mixing is performed by giving oscillatory movement to the bottom of the freely flexible part 10 by an oscillating mechanism B. In this oscillation mixer, the opening of the rigid pat and/or the oscillating frame 2 is sealed tightly with sealing materials 34, 21 such as gasket. An evacuating mechanism comprising a vacuum pump V, vacuum hose 23, etc. is connected, and mixing is performed in vacuum. As the result, mixing of air is prevented, and mixing effect is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a vacuum oscillating mixer for mixing by applying an oscillating motion to the bottom of a flexible material container.

The mixing motion in the mixing device is generally convective mixing.

It can be broadly divided into shear mixing and diffusion mixing.

Among these, diffusion mixing has excellent performance as soft mixing, which does not cause damage to the mixture such as breaking particles or bending fibers. Make this kind of diffusion mixing more efficient〈
As a possible mixing device, the mixed materials are put into a flexible mixer made of a flexible sheet such as a canvas reinforced rubber sheet, and the mixture is accelerated by applying a rocking motion to the bottom of the mixer. A mixer has been developed that can change the speed and direction of the particles and disperse them in random directions while mixing multiple types of materials with extremely different specific gravities and brittle aggregates in a short time without damaging them.

However, even with this type of mixing method, it is extremely difficult to defoam the air contained between the various mixed materials and the air generated during the mixing process, so the molding machine is At present, it is necessary to apply appropriate imaging to expel the trapped air to reduce the amount of remaining voids in the molded body.

Carbon fiber, which has been created through research and development of cement-based composite materials in recent years, is said to be stronger than steel and lighter than aluminum, and it has become possible to supply it at a low price, making it easy to use as a cement-based composite material. It is becoming more and more.

In order to use it as a carbon fiber cement-based composite material, short fibers obtained by cutting a bundle of long fibers into a predetermined size are used, and the practical allowable limit of the length is considered to be about 3 to 30 mm.

The diameter of the current single fiber is 8 to 17 microns and the specific gravity is 1.2.
Because it is light and has high elasticity of approximately 1.9, the fibers aggregate into floc-like small lumps due to the pressure applied during cutting, and when premixed with cement, aggregate, etc., the fibers entrain air and form ball-shaped small lumps. It is extremely difficult to disperse and melt into single fibers.

From this point of view, the vacuum mixer of the present invention is designed to remove air contained between the container and the fibers and materials introduced during mixing by sealing the inside of the container and mixing under vacuum conditions. This prevents contamination and promotes the efficiency of the mixing action, solving the problems of the prior art and making it possible to carry out the next mixing in a short time.

This greatly improves the mixing operation rate and improves the work efficiency in the molding and filling processes by 7 times. Embodiments of the present invention will now be described with reference to the accompanying drawings.

Figure 1 is an overall view of the mixer of the present invention, in which a reversing frame 2 is supported by an inverting shaft 3 on a fixed frame 1 installed on the floor so that it can be turned upside down. A tin rocket 5 is fixed. Fixed frame 1
A torque actuator that can rotate 180 degrees is attached to one side (on the side of the tin rocket 5), a sprocket 8 is attached to the tip of the shaft, and a chain 6 wound around the tin rocket 5 is connected.

Therefore, when the torque actuator is differentially moved, the reversing frame 2 is reversed vertically.

The reversing frame 2 includes a rubber part 10 that can be freely moved by a lower arm and a rigid upper part 25, each of which is integrated with an i-shaped band 24 for coupling, as an example of a mixing container C.
It is attached to an inversion frame that is hermetically sealed with a drive unit mounting plate 20 and a mixing container fixing plate 22. “The rocking plate 16 of the flexible portion 10 and the rocking plate frame 1
7 is a swing drive shaft 13. Vertical drive shaft 14, swing arm 15
The swinging part B equipped with is attached and fixed with a bold of 18.19.

When the hydraulic motor 12 is operated differentially, the swinging part B causes the flexible part 10 to swing, causing the mixed material in the mixing container C to flow, changing its speed and direction, and scattering it in random directions. Diffusion mix while stirring.

The upper lid 26 with the sealing seal 34 attached to the upper open part of the mixing container C is completely sealed with mounting bolts 30 attached to both sides of the rigid upper frame 25.

When the vacuum bonder V is oscillated and suction is started while the mixture is mixed by oscillating motion in the sealed container, the pressure inside the mixing container is gradually reduced.

Under reduced pressure conditions, the air interposed between the charged mixed materials is suctioned and the inside of the container becomes a vacuum state, so that the mixed aggregate is dispersed and the mixing action is accelerated.

In this case, as the vacuum inside the mixing container C progresses, the rubber part of the flexible part may develop depressions in some parts due to the suction pressure, which may adversely affect the dispersion of the material in the container, so the inverted frame part is sealed. By suctioning and reducing the pressure from both the suction ports 33 and 33, it is possible to stably perform rocking motion under the same vacuum conditions on the inside and outside of the mixing container.

The method of using the mixing device described above is as follows.

First, predetermined measured materials such as cement, fine aggregate, coarse aggregate, carbon fiber, and water are put into the mixing container 6, and then the upper lid is sealed with the bold 30.

Next, when the mixing operation valve 39 is differentially operated and the hydraulic motor 12 attached to the lower end of the reversing frame is rotated, the swinging plate 16 causes a swinging motion via the swinging part B, and each of the parts in the mixing container is rotated. The materials are mixed by diffusion.

Next, the vacuum pump V is operated differentially to cover the inside of the mixing container C with the upper lid 2.
When the pressure is reduced through the suction socket 32 of No. 6 and at the same time suction is also performed from the suction socket 33 on the reversing frame side, a vacuum state develops inside and outside the mixing container, and each suction socket is connected to the vacuum tank 35. O is displayed on the vacuum tank gauge 36 under the same pressure conditions.In the mixing container, the air between the aggregates is sucked, so even with cotton-like carbon fibers, each material is processed without the formation of small lumps or lumps like in the past. evenly distributed.

In this case, if you start suction when the mixing container is completely dry with no moisture, fine powder particles such as cement will be sucked into the pre-pressure vacuum tank where it will be mixed with the aggregate, so suction will not start. It is desirable to turn on the vacuum pump after the mixed water is in a wet state.

When the preset time has elapsed, the vacuum pump is turned off and mixing is completed, so the upper lid suction chamber 32
1 Inversion frame suction port 33 side suction insertion socket 31
Then, in order to discharge the material, remove the upper tit- and then operate the reversing operation valve 38t. The torque actuator is differentially activated, and the mixing container is reversed via the chain 6 from the upper opening. The material is discharged into the material supply hopper 40.

This discharged material is moved to the next forming and filling process, where it is subjected to vibration and pressure forming.

When performing the next mixing, the reversing operation valve 38 is operated again, and the upper opening returns to the normal rotation position shown in FIG. Next, put in the various materials that have been measured in advance, put the top lid on, and vacuum the suction port 31t - each suction port 32.
33 and then operate the driving operation valve 39 to repeat the same procedure as described above to perform mixing.

An example of concrete mixed with carbon fibers has been described above, but this mixer can also be used with shear mixing or convection mixing by adding spiral rods or rotating blades in place of the mixing rod 11 as necessary. It is also possible to perform mixing under reduced suction pressure.

As is clear from the above description, the present invention is designed to relatively prevent air from entering during mixing of cotton-like fibers and brittle aggregates with extremely different specific gravity by mixing the mixing container in a vacuum state. Mixing the raw materials in a vacuum condition facilitates uniform dispersion of the mixture.

This reduces the time in the molding and filling process, reduces the vibration force, prevents the generation of noise and dust due to mixing in a closed state, improves the molding operation rate, and improves the trap work environment. The technical and economic effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partially vertical front view of the mixer of the present invention, Fig. 2 is a plan view, Fig. 3 is a detailed view of the view in the direction of arrow A in Fig. 1, and the fourth factor is an explanatory diagram showing the sealed state of the upper lid. . 1...Mixer 7 ram, 4.Old...Reversing bearing,
9゜21.34 Old... Sealing seal, 12...
Hydraulic motor, 13...Swivel drive shaft, 23...
...Vacuum hose, 27...Handle, 28...
...Tightening plate, 37.Old...Hydraulic unit, B
・Old...Swinging part, C...Mixing container, ■...
··Vacuum pump. Patent applicant Chiyoda Giken Kogyo Co., Ltd.

Claims (1)

[Claims] (1) A swinging frame that can be turned upside down is supported on a fixed frame, a mixer consisting of a lower flexible part and an upper rigid part is attached to this swinging frame, and the bottom sK swinging part of the flexible part is attached to the swinging frame. In an oscillating mixer that mixes by applying dynamic motion, the rigid open part and/or the oscillating frame are each loaded with a sealing material such as packing and sealed, and a decompression mechanism is arranged and connected to mix under vacuum conditions. A vacuum oscillating mixer featuring: