JPH0445844Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a powder box segregation prevention device for a brick forming press.

Conventional technology Conventionally, refractory bricks were made by transporting raw materials kneaded in a mixer to a powder bowl on the side of a brick-forming press using a belt conveyor, measuring the raw materials using the volumetric method of cutting the powder bowl, and pressing the powder. The powder container was moved to the top of the mold according to the schedule, and the raw materials were put into the mold and press-molded.

However, even if the raw materials are sufficiently kneaded with a mixer,
Variations in the particle size distribution of the raw materials occur while being fed into the mold of a brick-forming press, resulting in non-uniformity in the press-molded brick bodies.

For this purpose, a service hopper is installed on the side of the brick forming press, a mixing device is installed in the service hopper to stir the raw materials, and a device is installed to level the top surface of the raw materials accumulated in the hopper. However, it was not possible to sufficiently prevent segregation.

Problems that the invention aims to solve: Therefore, in order to find out how the particle size distribution of raw materials in brick molded bodies varies, we took out 12 brick molded bodies formed by two bricks per cycle and divided them into 12 pieces every 5 cycles. 144 samples were prepared, washed with water, disassembled, and measured for particle size distribution.

As a result, it was found that, as shown in FIGS. 5 and 6, the brick molded body 1 had a relatively large amount of coarse particles on the outside in the direction of movement of the powder box, and a large amount of fine particles on the inside. The average variation is about 8%, with a standard deviation of 1.5 to 2.0.
It was %.

Means for Solving the Problems The present invention was developed in view of the above-mentioned problems, and in order to solve the above-mentioned problems, a method for brick molding in which raw materials are charged into the mold through a powder box is proposed. In the press, paddle-type stirring blades are provided on both ends of a stirring shaft of a mixing device for preventing segregation, and bar-shaped stirring blades are provided protruding from the center side, and the stirring shaft is parallel to the moving direction of the powder box for the above mixing. An object of the present invention is to provide a powder cell segregation prevention device for a brick molding press, characterized in that the device is disposed within a powder cell.

Effects According to the present invention, by installing a mixing device in the powder box in the final process of loading raw materials into the mold of a brick molding press, variations in particle size density of raw materials can be corrected, and the mixing device can also be installed. By installing the powder cell parallel to the direction of movement, it is possible to correct the tendency for variation in particle size distribution that previously occurred.
The quality of the brick molded body is improved.

Example The present invention will be explained below based on examples.

FIG. 1 and subsequent figures show an embodiment of the present invention. The powder box 2 is installed on the side of the brick forming press 3 as shown in Fig. 1, and the raw material 5 weighed by the service hopper 4 is finally re-stirred and transferred to the powder box 2 according to the press schedule. The raw material 5 is transported to the upper part of the mold 7 by a reciprocating drive device 6 such as a hydraulic cylinder, and the raw material 5 is placed in the mold 7 so that it can be freely loaded. As shown in FIGS. 1 and 2, this powder bowl 2 is equipped with a mixing device 9 in which two stirring shafts 8 are suspended symmetrically in the moving direction of the powder bowl 2. Round rod-shaped stirring blades 10 as shown in FIG. 3 are protruded from the side of the stirrer 8 at regular intervals, and wide paddle-type stirring blades 11 as shown in FIG. 4 are protruded from both ends of the stirring shaft 8. The raw material 5 can be re-stirred uniformly within the powder box 2.
Electric motors 12 such as geared motors with a low speed rotation ratio of 50 to 120 revolutions per minute are connected to the stirring shaft 8 of the mixing device 9, and left and right stirring blades 10 are connected as shown in FIG. , 11 can be rotated inwardly or outwardly on the opposite side, and can be freely controlled by a timer or the like as appropriate.

At the top of the powder box 2 arranged in this way, there is a first
Hopper mixing device 13 as shown in FIG.
A service hopper 4 equipped with the above is provided, and the raw material 5 introduced by the belt conveyor 14 is stirred and falls into the powder box 2, and the powder box 2 cuts the material into a fixed amount. The mold 7 is loaded. 15 is a level sensor.

The mixing device 9 in the powder box 2 is driven by the reciprocating drive device 6 to stir the raw material 5 when moving, but it can also be driven during standby before movement to mix the raw material 5. It is preferable to drive for at least 10 to 20 seconds or more before charging into the mold 7.

As a result of molding bricks using the powder box 2 above,
The standard deviation of the particle size distribution, which used to be 1.5 to 2.0, has decreased to 0.7 to 1.0, improving the molding yield by 0.9%, and reducing the amount of coarse particles and fine powder on the brick surface, increasing the product value. Improved.

In addition, the particle size of the raw material can be uniformly loaded into the mold, and the compressibility of the raw material changes depending on the variation in the particle size distribution under the conventional press output which is almost constant, so there is no variation in the thickness dimension of the molded product. In this way, the dimensional adjustment time of the press, which used to require about 6%, was halved to about 3%.

In the above embodiment, two stirring shafts are used, but if three or more bricks are to be molded in one press cycle, three or four stirring shafts can be added.

Effects of the invention As described above, with this invention, the paddle-type stirring blades on both ends of the stirring shaft of the mixing device can well stir the clay, which tends to scatter on both ends of the powder container, and the center The clay can be stirred uniformly with the rod-shaped stirring blade. and,
Since the stirring shaft is parallel to the direction of movement of the powder cell and the mixing device is placed inside the powder cell, conventionally the brick molded body has many coarse particles on both outer sides in the direction of movement of the powder cell and fine powder on the inner side. It is possible to homogenize the dispersion of particle size distribution of materials that are easily segregated, and it is possible to correct the dispersion of particle size distribution of the raw material fed into the mold in the final process of raw material supply, improving the quality of the brick molded body. In addition, the adjustment time of the brick molding press can be reduced, leading to improved productivity.

[Brief explanation of the drawing]

1 and 2 are partially omitted explanatory schematic front sectional views and side sectional views of an embodiment of the present invention, and FIGS. 3 and 4 are side views of stirring blades of the same mixing device, respectively. FIGS. 5 and 6 are a plan view and a side view showing the particle size distribution of a conventional brick molded body. 1... Brick molded body, 2... Powder box, 3... Brick molding press, 5... Raw material, 9... Mixing device.

Claims (1)

[Scope of Claim for Utility Model Registration] In a brick molding press in which raw materials are loaded into a mold through a powder bowl, paddle-type stirring blades are installed at both ends of the stirring shaft of a mixing device to prevent segregation, and A powder cell segregation prevention device for a brick molding press, characterized in that a bar-shaped stirring blade is provided protruding from the side of the powder cell, and the mixing device is disposed inside the powder cell with the stirring shaft parallel to the direction of movement of the powder cell. .