JPH0446859B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method of cutting uncured molded products of cement, synthetic resin, ceramic, etc., continuously extruded from an extruder, in a kneading section, and conveying the cut products in the extrusion direction. The present invention relates to a method and an apparatus for the same.

[Conventional technology]

Recently, elongated members having various cross-sectional shapes have been frequently used as construction materials. Taking cement mold materials as an example, a cement material is mixed with water and extruded onto a conveyor belt in the form of an uncured molded product using an extruder, and then placed on other belts as necessary. The material is transferred onto a pallet, cut to a required length at an appropriate position, and transported in a continuous state, and further sent to a step for curing and curing.

However, when using a conveyor belt or a combination of a conveyor belt and a pallet, the uncured molded product on these conveyor belts is still soft, and if the cross-sectional shape is complex, the upper surface of the conveyor belt etc. The conveyor belt must have uniform rigidity in the width direction, and the conveyor belt has uneven lateral (meandering) and vertical (deflection) speeds that are commonly seen. There are many problems such as the straightness of the cement molded product decreases and warping, bending, twisting, etc. due to the influence of the molded product during transportation or transfer between conveyor belts.

[Problem that the invention seeks to solve]

For this reason, various types of conveyor belts have been proposed in the past, but no matter what belt conveyor is used, if the moving speed of the conveyor is not synchronized with the extrusion speed of the extruder, the molded product will expand and contract, resulting in poor straightness. Due to the reduced dimensional stability, complex mechanisms are required for tuning. Furthermore, since it is in the state of an uncured molded product, it is not possible to guide the cement molded material with a fixed guide member intended to prevent it from twisting.

[Means for solving problems]

The present invention has been made in view of the above, and uses the air action principle to completely levitate the uncured molded product and form a thin air film between the conveying device or guide member and the uncured molded product.
The object of the present invention is to provide a method and apparatus that completely eliminates direct contact between a conveying device and an uncured molded article, and further conveys the article by extrusion pressure and jetted fluid of an extruder.

The gist of the method of the present invention is to cut a kneaded material of a curable plastic material continuously extruded into a predetermined cross-sectional shape from an extruder into a predetermined length in an uncured state, and to cut the already cut part into a bottom part of the predetermined cross-sectional shape. In a method of transporting while being floated by gas ejected from the surface of the track on a track that matches the shape, the uncut part has the same shape as the track of the cut part, and the gas from the surface moves to the bottom of the uncut part. The cut part is conveyed by extrusion pressure in a non-contact state on a substantially horizontal track that ejects perpendicularly to the surface, and the cut part is at least partially directed from the track surface to the bottom surface of the cut part in the extrusion direction. This is a floating conveyance method for an uncured molded article, characterized in that the uncured molded article is conveyed in a non-contact manner on a substantially horizontal trajectory on which gas is ejected at an angle, using the ejection force of the gas, and faster than the uncut portion.

The gist of the apparatus of the present invention for carrying out the method of the present invention is an extruder for curable plastic material, a track for conveying the uncut part of an uncured molded product, a cutting machine, a track for transporting the cut part of an uncured molded product. are sequentially installed, the extruder includes a die for forming a predetermined cross-sectional shape,
The uncut portion conveying track extends approximately horizontally in the extrusion direction,
and has a surface shape that matches the shape of the surface facing the orbit of the predetermined cross-sectional shape of the uncured molded product, and has a large number of ejection holes on the surface that can eject gas in a direction perpendicular to the surface. , the plurality of ejection holes are connected to a pressurized fluid chamber, the cutting machine is provided with means for making cutting incisions in the uncured molded product above a track for transporting the uncut part, and the track for transporting the cut part is connected to the track for transporting the uncut part. It extends almost horizontally in the same direction as the track for transporting the cut part, and has a surface shape matching the shape of the surface facing the track for transporting the cut part out of the predetermined cross-sectional shape of the uncured molded product, and the surface has at least A floating conveyance device for uncured molded products, characterized in that it has a large number of ejection holes for ejecting gas, some of which are inclined in the extrusion direction, and the large number of ejection holes are connected to a pressurized fluid chamber. be.

[Effect]

According to the present invention, an uncured molded product extruded from an extruder and cut into a predetermined length is floated by a fluid ejected from an ejector, and guided along the ejection surface of the ejector by the ejection action of the ejected fluid, Since a non-contact guide means is used to move the ejector in the longitudinal direction,
The structure is simple and extremely practical, since there is no complicated conveyor belt that is used in direct contact with the conventional method, and there is no guide member that deteriorates the linearity and dimensional stability of the molded product.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 3 showing a first embodiment of the present invention, an uncured molded product 1 continuously extruded from an extruder (not shown) having a molding die has a chevron-shaped cross-section. A stationary conveying track, that is, a fluid ejector 2 is disposed directly below the front of the die of the extruder along the extrusion direction. The ejector 2 makes a cut in the uncured molded article 1 above the ejector, which serves as an indirect cradle for the uncured molded article 1 . The ejector 2 is a horizontally arranged elongated structure, and its upper cross-sectional shape is formed into a chevron shape corresponding to the bottom cross-sectional shape formed by the bottom surface of the uncured molded product 1. In this embodiment, the ejector 2 is formed into a triangular shape for convenience, and a pressurized fluid chamber 3 is provided inside the ejector 2 over almost the entire length thereof. Further, the upper surface (ejection surface) 2A opposite to the bottom surface of the uncured molded product 1 is formed in a smooth shape, and over the area opposite to the bottom surface,
A large number of ejection holes 4 are provided, each communicating with a pressurized fluid chamber 3.

Fluid, for example air, supplied from a fluid source (not shown) to the pressurized fluid chamber 3 is ejected from the ejection hole 4 uniformly or with a controlled air volume. Therefore, when the cut portion of the uncured molded product 1 that has been continuously extruded and cut by the extruder is on the ejector 2, the uncured molded product 1 is It is in a floating state with a very small fluid layer maintained between the ejector 2 and the ejector 2, and is moved by the pressing force of the uncut portion of the subsequent uncured molded product extruded from the extruder. At this time, the uncured molded product 1 and the ejector 2 are not in contact with each other, but since the top surface of the ejector 2 has a cross-sectional shape corresponding to the bottom surface of the cut part of the uncured molded product 1, they are brought into contact. The straightness of the uncured molded product can be maintained even without a guide member to guide it.

In addition, in FIG. 1, the distance between the uncured molded product and the ejector is exaggerated for clarity, and the ejected fluid hits the uncured molded product 1 as shown in FIG. After floating, it is discharged from its periphery to the outside. Additionally, if the uncured molded product shifts during transportation and a difference occurs in the left and right gaps between the uncured molded product 1 and the fluid ejector 2, the injection pressure acting on the narrower gap will be greater than the injection pressure acting on the wider gap. As a result, the uncured molded product that has shifted in the width direction returns to its original state and balance is maintained. As shown in FIG. 3, the direction of the axis of the jet hole 4 is perpendicular to the upper surface 2A in the cutting area A near the exit of the extruder, and is spaced a predetermined distance from the exit of the extruder. The area in front of the area B after cutting is formed in an upwardly inclined shape with respect to the extrusion direction. This is because in region A, the extrusion pressure of the extruder has sufficient moving force (feeding) to move the uncut portion of the uncured molded product 1, but in region B, the extrusion pressure of the extruder has sufficient moving force (feeding) to move the uncut portion of the uncured molded product 1. This is because the uncut portion must be transported to another ejector earlier than the uncut portion, removed from the flow, and prepared to receive the subsequent cut portion.

In the above description, the distribution of ejection ports with different ejection directions is simply divided into two regions, but they may be mixed in consideration of the degree of necessity for floating or conveyance.

FIG. 4 shows a case where the uncured molded product 1 is a flat plate, and the upper cross-sectional shape of the ejector 2 is formed into a channel shape that surrounds the lower cross-sectional shape consisting of the side and bottom surfaces other than the top surface of the uncured molded product 1. do. In this case, the ejection holes 4 are also provided in the flange portion of the channel cross section. If the uncured molded product 1 shifts in the width direction of the channel during transportation and a difference occurs in the left and right gaps 5 and 6 between the uncured molded product 1 and the flange portion, for example, if the gap 6 becomes larger than the gap 5. Since the pressure in the gap 6 becomes lower than the pressure in the gap 5 due to the upwardly discharged fluid, the uncured molded product 1 is drawn to the right in FIG. 4 and is maintained in equilibrium.

FIG. 5 shows a case where the uncured molded product 1 is a round tube, in which case the upper cross section of the ejector 2 is formed into a semicircular shape surrounding the lower cross section of the uncured molded product 1. The deviation in the width direction of the uncured molded product during transportation is corrected using the same principle as in the case of FIG.

〔Effect of the invention〕

The present invention is constructed as described above, and the uncured molded product extruded from an extruder and cut into a predetermined length is cut into an uncut portion and a cut portion by a jetting fluid to remove the bottom cross section of the uncured molded product. The material was floated and guided in a non-contact manner on an ejector having an upper cross-sectional shape corresponding to the shape, and the former was moved by the extrusion pressure of the extruder, and the latter was moved by the pressing force of the subsequent uncut part and the obliquely jetted fluid. It is completely unaffected by the conveyor belt as in conventional methods, and even if the uncured molded product deviates in the width direction for some reason, it has a self-aligning action that returns it to its original equilibrium state, so the uncured molded product can be processed while being transported. There are no problems such as deterioration in the straightness of the product, warping, bending, or twisting, and there is no need to synchronize the conveyance speed of the cut part with the extrusion speed of the extruder.Furthermore, there is no fixed guide member, so the product can be uncured. It won't hurt. Therefore, it has many advantages over conventional ones, such as improved product quality and extremely simple structure and mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the first embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a perspective view of the ejector shown in FIG. 1, and FIGS. FIG. 3 is a sectional view showing a second embodiment and a third embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Uncured molded product, 2... Ejector (track for conveying uncured molded product), 2A... Upper surface (surface) of ejector, 3... Pressurized fluid chamber, 4... Ejection hole.

Claims (1)

[Claims] 1. A kneaded material of a curable plastic material continuously extruded into a predetermined cross-sectional shape by an extruder is cut into a predetermined length in an uncured state, and the cut portion is cut into a bottom shape of the predetermined cross-sectional shape. In this method, the uncut part has the same shape as the trajectory of the cut part, and the gas flows from the surface to the bottom surface of the uncut part. The cut part is conveyed by extrusion pressure in a non-contact state on a substantially horizontal track that ejects perpendicularly to 1. A floating conveyance method for an uncured molded article, characterized in that the uncured molded article is conveyed in a non-contact manner on a substantially horizontal trajectory in which a gas is spouted, using the jetting force of the gas, and faster than an uncut portion. 2. A device in which an extruder for curable plastic material, a track for transporting uncut parts of uncured molded products, a cutting machine, and a track for transporting cut parts of uncured molded products are installed in sequence,
The extruder includes a die for forming a predetermined cross-sectional shape, a track for conveying the uncut portion extends approximately horizontally in the extrusion direction, and a surface matching the shape of the surface facing the track of the predetermined cross-sectional shape of the uncured molded product. The surface has a large number of ejection holes capable of ejecting gas in a direction perpendicular to the surface, and the large number of ejection holes are connected to a pressurized fluid chamber, and the cutting machine cuts the uncut portion. A means is provided to cut the uncured molded product above the transport track, and the cut part transport track extends substantially horizontally in the same direction as the uncut part transport track, and the cut part transport track extends substantially horizontally in the same direction as the uncut part transport track, and within the predetermined cross-sectional shape of the uncured molded product. It has a surface shape that matches the shape of the surface facing the track for conveying the cut part, and the surface has a large number of gas ejection holes, at least some of which are inclined in the extrusion direction, and the large number of A floating conveyance device for an uncured molded product, characterized in that the ejection hole is connected to a pressurized fluid chamber.