JPH04270603A - Receiving method of extrusion molded product of cement material - Google Patents

Abstract

PURPOSE:To receive an extrusion molded product of cement material extruded through an extruding machine so that neither a crack nor spoiling of linearity is generated. CONSTITUTION:A driving roller 3 is interposed between an extruding machine 1 and receiving machine 4, an extrusion molded product 5 is received at a speed of at least 1.2 times of an extruding speed of an extrusion molded product 5 by the receiving machine 4 and receiving is performed at a linear speed of the foregoing driving roller faster than the extruding speed of the extrusion molded product 5 and slower than a receiving speed of the receiving machine.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for taking an extruded product of cementitious material.

0002

[Prior Art] Generally, in extrusion molding of cementitious materials, it is difficult to adjust the flow of the material within the mold attached to the tip of the extruder, making it difficult to extrude uniformly and obtain molded products with good linearity. It is. By the way, the following method is known as a method for collecting an extruded product of cement material extruded from an extruder.

[0003] An auxiliary conveyor that moves in a passive manner receives the extrudates, and then a main conveyor takes them away. At this time, the speed of the auxiliary conveyor is detected by a detector, and the take-up speed of the main conveyor is controlled to synchronize the take-up speed of the main conveyor with the speed of the auxiliary conveyor (Japanese Patent Application Laid-Open No. 121727/1983). In addition, there is a method in which the extrusion molded product is passed over a free roller and then taken up by a take-up conveyor equipped with a drive roller at a speed faster than the extrusion speed of the extrusion molded product (Japanese Patent Laid-Open No. 57-1400).
Publication No. 7).

0004

[Problem to be solved by the invention] By the way, in the former method, the extrusion molded product is taken off at a speed commensurate with the extrusion speed, but if it is taken off in synchronization with the extrusion speed in this way, An extruded product with good linearity could not be obtained using a material with low plasticity. In addition, in the latter method, the extrusion molded product is 1.2 times faster than its extrusion speed.
If the drawing speed is twice as fast, the straightness of the extruded product of cementitious materials tends to improve, but since the extruded product is pulled so rapidly, cracks tend to occur in the extruded product. There was a problem that good quality products could not be obtained.

[0005] In view of these points, an object of the present invention is to take an extrusion molded product of a cementitious material extruded from an extruder without causing cracks or impairing its linearity.

[0006]

[Means for Solving the Problems] The method of taking an extruded product of a cement-based material according to the present invention includes extruding the cement-based material as an extruded product from an extruder, and collecting the extruded product using a taking-off machine. A drive roller is interposed between the extruder and the take-off machine, and the extrusion molded product is taken off by the take-off machine at a speed of 1.2 times or more of the extrusion speed of the extrusion molded product, and the linear speed of the drive roller is It is characterized in that the molded product is taken off at a speed faster than the extrusion speed of the molded product and slower than the take-up speed of the take-off machine.

[0007] In addition, in such a method for taking an extrusion molded product of cement-based material, a plurality of drive rollers are provided, and the linear velocity of the drive rollers is sequentially increased at a speed of 1.1 times or less than that of the extruder side. It is characterized by the fact that In this invention, as a take-up machine for extruded products,
Examples include take-up conveyors and take-up rollers. As a method for providing a plurality of drive rollers and increasing the linear velocity of the drive rollers sequentially at a speed of 1.1 times or less than that on the extruder side, the diameters of the rollers are sequentially increased from the extruder side, and each roller has the same linear speed. There are methods such as sequentially increasing the linear speed of the drive roller by rotating it at a speed of can give.

[0008]

[Function] It is difficult to adjust the flow of cement material in the mold attached to the extruder, and there are parts with good flow and parts with bad flow, and when the parts with good flow are extruded, sagging occurs.
This impairs the linearity of the extruded product, but in this invention, such sag is eliminated by taking it off at a speed of 1.2 times or more than the extrusion speed of the extruded product, and the extruded product has good linearity. is obtained. Then, before taking it off at such a speed, the extrusion is rolled by a drive roller for 1.2 seconds.
The speed will be increased to less than twice the speed and the collection machine will pick it up, so 1
．． It is more than twice as fast and does not need to be taken off all at once, eliminating cracks in extruded products.

[0009]

[Embodiments] Examples of the present invention will be described below. Example 1 FIG. 1 is a side view showing one embodiment of the method of the present invention, in which 1 is a partially illustrated extruder, 2 is a mold, 3 is a
The diameter ratio of the adjacent rollers is 1.05, and the diameter increases as the distance from the extruder 1 increases, and the three first rollers 31 and the second roller are driven to rotate at the same rotational speed.
Drive rollers 4 include a roller 32 and a third roller 33, and a take-up conveyor.

Using the illustrated apparatus, a cementitious material consisting of a mixture of 100 parts by weight of cement, 40 parts by weight of fly ash, 10 parts by weight of pulp, 10 parts by weight of methyl cellulose and 50 parts by weight of water was extruded into an extrusion molded product 5 at an extrusion speed of 10 mm. /
sec, the take-up speed of take-up conveyor 4 is 12 mm/sec.
and the linear velocity of the first drive roller 31 is 10.5 mm/s.
The rotational speed of the drive roller 3 was set to be ec, and the extrusion molded product 5 having the cross-sectional shape shown in FIG. 2 was extruded.

[0011] This extrusion molded product 5 was smoothly accelerated by the three rollers and taken up by the take-up conveyor 4, so that the presence or absence of cracks, linearity, and surface roughness were good as shown in Table 1. Ta. In addition, the linearity of the extrusion molded product in Table 1 is the distance (mm) by which the side edge of the extrusion molded product 5 deviates from the extrusion direction at a time of 50 cm from the mold 2.
The surface unevenness is the value obtained by measuring the depth (mm) of the unevenness at positions A, B, and C shown in FIG.

Embodiment 2 FIG. 2 is a side view showing another embodiment of the method of the present invention, in which the three rollers 31a and 32a of the drive roller 3a are
, 33a have the same diameter and can each be driven to rotate at a linear speed 1.05 times higher than that of the rollers on the extruder 1 side.

The same cement-based material as in Example 1 was used at an extrusion speed of 10 mm/sec for the extruded product 5, a take-up speed of the take-up conveyor 4 at 12 mm/sec, and a roller 31a.
The rotational speed of each driving roller 3a is set so that the linear speed of the roller 32a is 10.5 mm/sec, the linear speed of the roller 32a is 11.0 mm/sec, and the linear speed of the roller 33a is 11.6 mm/sec. An extrusion molded product 5 having a cross-sectional shape shown in 2 was extruded.

The extrusion molded product 5 was smoothly accelerated by the three rollers and taken up by the take-up conveyor 4, so the presence of cracks, straightness, and surface roughness were good as shown in Table 1. Ta. Note that the linearity and surface roughness of the extruded product were measured in the same manner as in Example 1. As shown in Table 1, the results were all good. Comparative Examples 1 and 2 In the apparatus shown in FIG. 1, the product was immediately taken up by the take-up conveyor 4 at a take-up speed 1.2 times the extrusion speed without using the drive roller 3 (Comparative Example 1). In addition, it was taken out in synchronization with the extrusion speed using the same device (Comparative Example 2). The rest was the same as in Example 1, and the presence or absence of cracks, linearity, and surface roughness were measured in the same manner as in Example 1.

[0015] As shown in Table 1, these results show that the linearity and surface roughness were not sufficient, and were inferior to Examples 1 and 2, and in Comparative Example 1, there were no cracks. I could see it.

[0016]

[Table 1]

[0017]

[Effects of the Invention] As described above, in the method of this invention, the speed of the extrusion molded product is increased to less than 1.2 times by the drive roller and taken by the take-up machine, so that It is possible to obtain a cement-based extrusion molded product without taking it all at once, eliminating cracks in the extrusion molded product, and having good linearity and surface roughness.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating one embodiment of the method of the present invention.

FIG. 2 is a side view illustrating another embodiment of the method of this invention.

FIG. 3 is a cross-sectional view of an example of an extruded product made of cement-based material.

[Explanation of symbols]

1 Extruder 2 Mold 3, 3a Drive roller 4 Taking machine (taking conveyor) 5 Extrusion molded product

Claims (2)

[Claims] Claim 1: Extruding a cement-based material as an extruded product from an extruder and taking this extruded product with a take-off machine, interposing a drive roller between the extruder and the take-off machine,
The extrusion speed of the extrusion molded product is 1.2 on the take-off machine.
A method for taking an extrusion molded product of a cementitious material, characterized in that the linear speed of the drive roller is faster than the extrusion speed of the extrusion molded product and slower than the take-up speed of the pulling machine. . 2. The cement system according to claim 1, wherein the cement system comprises a plurality of drive rollers, and the linear velocity of the drive rollers is sequentially increased by 1.1 times or less than that on the extruder side. How to collect extruded materials.