JPS61197323A - Method of charging raw material, and powder container therefor - Google Patents

Abstract

PURPOSE:To make the charged density of a molded tile material uniform after pressing it, by intentionally nonuniformly charging the material in a molding space so that the charged densities of the front and rear portions of the space, its front and central portions, its central and rear portions or its central, right and right portions are not equal to each other. CONSTITUTION:The front-to-rear width of the raw material charging space 35 of a powder container 10 is maximized at the middle between the right and left sides thereof. The front and rear inside surfaces of the powder container 10, which extend on the space 35, are curved. A raw material 14 is charged into the molding space 12 of a press die 15 from the powder container 10. The speed of the charging of the raw material 14 into the rear portion of the space 12 is made lower than that into its other portions so that the raw material is charged into the central and front portions of the space more than into its rear portion and charged into its central portion more than into its right and left portions. When the raw material 14 is leveled by the powder container 10 being moved back, the charged density of the raw material is higher in the central portion of the space 12 than in its other portions to prevent the charged density from becoming different between the central and peripheral portions of the press-molded charged raw material 14 due to the removal of air at the time of press- molding. The density of the press-molded raw material 14 is thus made uniform throughout it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for filling raw materials to obtain a tile molded body or the like having a uniform packing density, and a powder container used in the method.

The following description will be based on the case of molding tiles.

[Conventional technology]

The powder container for filling the conventional clay into the press mold is the 9th one.
As shown in the figure. The clay filling space 2 of this powder cell 1 has a rectangular parallelepiped shape, and the inside thereof is partitioned by a partition plate 3. The partition plate 3 is for reducing the deviation of the crosspiece 4 (deviation in the forward direction) when the powder container is stopped. The clay is supplied by applying vibration to the powder chamber 1 in order to improve the powder filling of the clay 4 into the molding space 6 of the press mold 5. After filling with clay, the powder mound 1 moves backward, and at this time, the front plate 7 is used to level out the piled clay 4.

After that, the upper mold 8 of the press mold 5 descends and presses.
Make it into a tile molded body. During this pressing, the clay 4 is supplied from the hopper 9 to the powder mound 1 and replenished.

[Problems to be solved by the present invention]

However, in the above-mentioned conventional clay filling, there was a drawback that the filling density of the clay varied by ±4 for the following reasons, and it was not possible to obtain a tile molded body with a uniform filling density. In other words, ■When the clay 4 is fed from the hopper 9 to the powder mound 1, the kneaded clay 4 has already been unevenly distributed, and ■When the kneaded clay 4 is leveled as the powder mound 1 moves backward. On the front side of the molding space 6, the clay 4 tends to be scraped backward and the filling density tends to be coarse, whereas on the rear side, the clay 4 is pushed and aggregated and the packing density becomes denser. ■In addition, during pressing, air is trapped in the center of the molding space 6 without being vented, and the packing density in the center of the tile molded product tends to be coarse. Air escapes sufficiently at the periphery of the molding space 6, and when the air escapes, it gathers from the center with a movement of ±4 (1st θ).
(see figure), the packing density at the periphery of the tile molded body tends to be denser (hereinafter, this phenomenon is referred to as draping), and thus the variation in the packing density of the tile molded body tends to be denser. When this occurs, the coefficient of thermal expansion and contraction during firing differs, resulting in undesirable problems such as warping of the product tile or causing cracking.

In addition, since precision is required for the movement of the powder container 1, a complicated mounting mechanism has conventionally been adopted. Therefore, much effort and time were required to change the setup. Therefore, it is common practice to use a powder container 1 with a large filling capacity so as to be able to handle the molding of small tiles. For this reason, there is also a drawback that it is not possible to effectively fill the clay 4 passed through the tile shape and size using a fixed device.

The present invention improves and eliminates the above-mentioned drawbacks of the conventional technology, and fills the molding space with clay at the front and rear, front and center, center and rear, or right and left and center areas. The purpose of the present invention is to provide a raw material filling method that can make the filling density of the tile molded body uniform after pressing even if there is an intentional non-uniformity in the molding process, and a powder container used in the method. .

[Means for solving problems]

Means for solving the problems of the present invention is that, during the speed required for filling the raw material into the molding space of the press mold, the powder container fills the rear part of the molding space faster than other parts. By doing so, the filling amount of the raw material is supplied so that it is larger in the center and front parts than in the rear part of the molding space, and is also supplied in a larger amount in the center part than in the left and right parts of the molding space. There is. Then, when the powder cell is retreated, the packing density of the raw material after being leveled by the powder cell is made to be denser in the center, and the center and surrounding areas of the molded product are The filling density error between the two parts is corrected to obtain a molded body with uniform filling density throughout.

Further, in the powder cell, the width of the raw material filling space in the front-rear direction (the moving direction of the powder cell) is maximized at the center portion in the left-right direction, and the front and rear wall surfaces of the raw material filling space are curved surfaces.

[For production]

As shown in FIGS. 1 and 4, the front and rear walls 10 of the powder cell 1o
a and 10b are curved surfaces, and when filling the molding space 12 of the press mold 11 with clay, the feeding speed of the powder chamber 10 is made variable by a servo motor 13. By forming the front and rear walls 10a, 10b-t of the powder container 10 into curved surfaces, the number of molds 14 supplied to the molding space 12 is larger in the center than in the left and right parts, as shown in FIG.

In addition, by setting the feeding speed of the powder container 10 to be faster in the center and front side of the molding space 12 than in the rear side,
As shown in FIG. 5, the amount of clay supplied to the center and front sides is larger than that to the rear sides.

The leveling of the pouches 14 by the backward movement of the powder container 10 makes the filling density of the central portion shown in the plan view of FIG. 8 denser than that of the remaining portions. Thereby, it is possible to make the filling density of the tile molded body uniform over the entire tile molded body even if there is an adverse effect of removing cold during pressing. In other words, the product tiles do not warp or crack.

The method and structure of the present invention will be explained below based on the embodiments shown in the drawings.

〔Example〕

FIG. 1 is an overall plan view of a tile forming line formed by applying the method and powder box 10 according to the present invention, and FIG. 2 is an X-X line in the same figure.
A third sectional view is a sectional view taken along the line Y-Y. This tile forming line includes a press mold 15, a lower mold 1 of the mold 15,
6 and the conveyor device 18.1 installed above the frame 17
JF@ Clay supply device 19 and tile suction device 20 that can freely slide on the feeding device 18. It is comprised of a tile stacking device 21 that is slidable in a direction perpendicular to the conveying device 18 below the end of the conveying path.

The conveyance device 18 has rails 22 such as C-beams arranged opposite to each other.
．． 22, inside which are small pulleys 23 and 2, respectively.
Timing belt 24 and large pulley 2 wrapped around 3
A timing belt 26 that is wrapped around the 5.25 is attached. 27 is a servo motor for driving the small boob IJ23, and 13 is a servo motor for driving the large pulley 25. 31 is a chamfering jig for the tile molded body 32 placed halfway between the rails 22 and 22.

The clay supply device 19 has a powder container lO with a bracket 7)28.2
8 to the timing belt 26.26. Therefore, when replacing the powder container 10, the bracket 2
The suction device 20, which only requires removing the fastening rod 29 of 8, has a suction body (for example, a sponge with many suction holes) 30 on the entire lower surface, and has
The mounting structure is the same as that of the clay supply device 19 described above. Therefore, the clay supply device 19 is driven by the servo motor 13, and the tile suction device 20 is driven by the servo motor 2.
7.

The tile stacking device 21 is configured to descend each time one tile molded body 32 is stacked so that the top surface of the tile located at the top of the stacking pleasure is at a constant horizontal level.

Next, based on the tile forming line configured as described above, the clay filling method and the operation mode of the entire line will be explained.

First, based on the pleasure shown in FIGS. 1 to 3, the servo motor 13 is driven to move the powder bowl 1σ forward (toward the left in FIGS. 1 and 3). Forward speed is normally set speedometer. Powder chamber 10 is molding space 1
When reaching the rear side of the mold 2, the beads 14 in the filling space 35 flow into the molding space 12, and the supply of the beads 14 is started.

Thereafter, the feed speed of the servo motor 13 is controlled based on a preset control pattern. The control is such that the speed is the slowest in the range from the rear side to the center of the molding space 12, and the speed is maintained at the same speed or slightly faster than the center in the range from the center to the front. By controlling the feeding speed so that the feeding rate is slower than that on the h side, the clay 14 supplied to the forming space 12 is
As shown in FIG. 5, the filling amount gradually increases from the rear side to the center, and reaches the maximum at the center. Moreover, the filling amount gradually decreases in the range from the center to the front. The amount of filling in the front part is greater than that in the rear part. On the other hand, in the left and right range of the molding space 12, the front and rear wall surfaces 10a of the powder container lO,
Since the filling portion 10b is curved so that the filling amount is maximum at the central portion, the left and right portions are uniform as shown in FIG. 6, and the filling amount reaches the maximum as it approaches the central portion. this is,
This is because, due to the special shape of the powder mound 10, the center part of the molding space 12 has more chances to overlap with the clay filling space 35 of the powder muffler 10 than the left and right parts.

After that, the powder container 1O is moved back and returned to its original position. Preferably, the retraction speed is slow throughout.

In the front part of the molding space 12, this is the front plate 10c of the powder container 10.
This tends to cause the clay 14 to be scraped backwards and the packing density to become coarse, so this phenomenon is prevented as much as possible by slowing down the retreating speed. Further, on the rear side, the pieces 14 are pushed together as the powder material 10 moves backward, so the aim is to suppress their aggregation as much as possible. After leveling, the filling density at the front and rear parts of the molding space becomes uniform.

This is due to the fact that the cloth is supplied to the front in advance in anticipation of the above-mentioned tendency.
This is achieved by making the filling amount of No. 14 larger than that on the rear side.

Incidentally, the retraction speed of the powder material 10 itself does not directly have a large effect on the packing density of the shims 14, and it goes without saying that the retraction speed of the powder material 10 may be maintained at a normal feeding speed. The variation in packing density between the front and rear portions is due to the leveling action of the powder material 10 itself. Preferably, powder material 1
This is because the backward speed of 0 is made gentle throughout.

When the powder material 10 is retracted and returned to its original state by the above-described special feeding technique of the mold 14, the amount of filling in the region 36 indicated by the chain line in FIG. 8 is denser than in the remaining peripheral region. This was done in anticipation of the effect of dewing during pressing (a phenomenon in which air is trapped in the center and the packing density becomes coarser than in the periphery) during pressing, which will be described later.

Incidentally, the supply of the clay 14 is actually leveled by the rear plate 10d during the forward movement of the powder material 10, as shown in FIG. 7, and the supply is not performed in a raised manner as shown in FIGS. 5 and 6. , This also applies when the powder material 10 moves backward. However, due to the special shape of the powder material 10 and the control of the forward feed rate, there is the greatest chance of polymerization between the molding space 12 and the clay filling space 35 of the powder material 10, and the clay 14 is compacted accordingly and the clay 14 is supplied. In other words, the same feeding theory as the situation shown in FIGS. 5 and 6 is obtained, resulting in the packing density shown in FIG.

After the supply of the mold 14 to the molding space 12 is completed in this manner, the upper mold 37 (see FIG. 3) is lowered and pressed. During this pressing, when air from the center of the molding space 12 escapes to the periphery, the clay 14 moves, causing variations in the packing density of the tile molded body 32 after pressing. However, in the technique of the present invention, the packing density of the central region 36, which becomes rough during this pressing, is set to be denser than that of the peripheral region, so even if there is an influence of the above-mentioned curl removal, this can be avoided. By doing so, it is possible to obtain a single tile molding 32 having a uniform packing density throughout. Therefore, the coefficient of thermal expansion and contraction during the subsequent firing process is uniform throughout the tile molded body, and will not cause warping, cracking, etc.

After pressing, the upper die 37 is raised and returned to the tile molded body 3.
2, the discharge is performed by a tile adsorption device 20. That is, after the upper mold 37 returns, the servo motor 27 is driven to move the tile suction device 20 onto the mold 15. Then, at this position, the push-down mechanism 3 of the suction device 20
7 is activated, and the adsorbent body 30 is elastically brought into close contact with the tile molded body 32 and adsorbed thereon. After the suction, it returns upward, and the servo motor 27 reversely rotates to return it backward in the left direction in FIGS. 1 and 3. On the way, the left and right edges of the upper surface of the tile molded body 32 come into contact with the chamfering jig 31, and chamfering is performed.

Next, the tile stacking device 21 moves forward below the suction device 20 shown in FIGS. 1 and 3. During the forward movement, the chamfering jigs 3B, 3B fixed to the stacking device 21 come into contact with the front and rear edges of the upper surface of the tile molded body 32 in the adsorbed state,
Chamfering is performed. After chamfering, the suction state is released,
The tile molded body 32 is transferred to the stacking device 21. Thereafter, the stacking device 21 is lowered by one tile and then returned to its original position to prepare for the next cycle.

The above is the operation of the entire line. After that, each of the above-mentioned operations is repeated and continued to sequentially manufacture the tile molded body 32. 6 Chamfering 1
Perform stacking.

In addition, in FIG. 1, 39.39 is a cylinder for raising/lowering for raising the conveyance apparatus 18, the tile suction apparatus 20 attached to this, and the clay supply apparatus 19. The cylinders 39 and 39 are used to change the powder material 10 and maintain the entire apparatus.

By the way, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.For example, the tile molded body may be discharged by kicking out with the front plate 10c as the powder material 10 moves forward. Alternatively, the line after discharge may be a normal line for conveying the tile molded body using a pan cord and chamfering it.

〔Effect of the invention〕

As explained above, in the present invention, variations in the packing density between the front and rear parts due to the scraping operation of the powder material, and variations in the packing density between the peripheral part and the central part caused by the effect of removing the curls during pressing are eliminated. It is possible to obtain a tile molded body with a uniform packing density. Therefore, the coefficient of thermal expansion and contraction during firing is uniform over the entire tile molded product, and there is no occurrence of warping or cranking in the product tile, making it possible to manufacture tiles with high precision. In addition, the powder material can be easily attached and removed, and the size of the tile to be formed can be adjusted easily.
It is easy to change the setup according to the shape.

[Brief explanation of drawings]

1 to 8 are related to the present invention; FIG. 1 is a plan view of the entire line, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG. -Y line sectional view, Figure 4 is a perspective view showing the powder material, Figures 5 to 7 are longitudinal sectional views of the mold showing the principle and operation of clay supply, and Figure 8 is a plan view of the molding space. , FIG. 9 and FIG. 10 are related to the prior art. FIG. 9 is a vertical cross-sectional view showing the entire mold, and FIG. 10 is a vertical cross-sectional view of the mold showing the state during pressing. 10a...Front wall surface of powder material 10b...: Rear wall surface 35 of powder material...Space for filling 10...Powder material 15...
Press mold 12...Molding space 32...Molded object
14...Applicant for clay patent Ina Seito Co., Ltd. Goto Iron Works Co., Ltd. Attorney Toshihiko Uchida, patent attorney No. 5rA Figure 7 Figure 8

Claims (1)

[Claims] 1. A powder container in which the width of the raw material filling space in the front-rear direction (movement direction) is maximized at the center in the left-right direction, and the front and rear walls of the filling space are curved surfaces. Prepare, and the powder mound is
During the speed required to fill the raw material into the molding space of the press mold, by making the filling speed in the rear part of the molding space faster than in other parts, the amount of raw material to be filled in the center and front parts of the molding space can be increased more than in the rear part of the molding space. The material is fed in such a way that the center part of the molding space is larger than the left and right parts of the molding space. The filling density is made denser in the center, and the filling density error between the center and peripheral parts of the molded product, which occurs due to the removal of curls during press molding, is corrected to create a molded product with a uniform filling density throughout. A raw material filling method characterized in that it aims to obtain the following. 2. In the powder tank used to fill raw materials such as clay for tile molding into the press mold, the width of the space for filling the raw material in the front and back direction (the direction of movement of the powder tank) is set so that the width in the center in the left and right direction is the largest. A powder container for filling raw materials, characterized in that the front and rear walls of the raw material filling space are curved surfaces.