JP2006007395A - Apparatus for preventing upright standing of chip of plastic board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent that cut chips of a plastic board at its front and rear ends cannot be shredded by means of a scrap chopper for shredding the cut chips because the cut chips uprightly stand on a conveyer. <P>SOLUTION: The apparatus for preventing the upright standing of the cut chips of the plastic board is composed of a tilted partition 2 which makes the cut chips 1 of the plastic board at its front and rear ends fall down on the conveyer 29 by bringing the surface in its width direction into contact with the tilted partition 2, and a compressed air blowing device 3 for pushing the chips 1 fallen on the conveyer 29 against the partition 2 by blowing compressed air therefrom. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for preventing cutting scraps at the front and rear ends of a plastic board from standing upright on a conveyor and being unable to be shredded by a scrap chopper for shredding cutting chips.

  The plastic board continuously molded by the molding T-die is successively cut to a length close to the product length without being completely cooled. At this time, the cutting length of the plastic board is cut longer than the product length in consideration of the shrinkage allowance due to cooling. It is cut off as cutting waste.

  FIG. 4 is an explanatory view of a cutting line for cutting off the front and back of the plastic board as cutting waste, (a) is a plan view of the cutting line, and (b) is a side view of the cutting line. The plastic board 22 </ b> A with the cutting allowance conveyed by the conveyor 21 is changed in direction by the conveyor 23 and inserted into the front and rear end scrap cutting device 24.

  The cutting device 24 is provided with two cutting machines 25a and 25b capable of simultaneously cutting the front and rear ends of the plastic board 22A, and the front and rear ends of the plastic board 22A are predetermined by these cutting machines. It cut | disconnects so that it may become length, and the cutting waste 26 will generate | occur | produce.

  The plastic board 22B after the cutting waste 26 is cut off is carried out of the cutting line by the conveyor 27. On the other hand, the cut scraps 26 that have been cut off fall onto a conveyor 28 disposed below the conveyor 27, and are conveyed toward a conveyor 29 that is orthogonal to the conveyor 28 and positioned below the conveyor 28. When the cutting waste 26 is conveyed by the conveyor 28, the longitudinal direction of the cutting waste 26 faces the width direction of the conveyor 28. However, when the cutting waste 26 is conveyed by the conveyor 29, the longitudinal direction of the cutting waste 26 is the same as that of the conveyor 29. It faces the transport direction.

  When the cutting waste 26 is transferred from the conveyor 28 to the conveyor 29, the width of the conveyor 29 is at the transfer position of the cutting waste 26 from the conveyor 28 to the conveyor 29 so that the cutting waste 26 is located at the center in the width direction of the conveyor 29. The partition 30 is provided so that it may be located in the center, and the cutting waste 26 hits the partition 30 and falls to the center in the width direction of the conveyor 29 with the longitudinal direction directed to the transport direction.

  And the cutting waste 26 is conveyed to the scrap chopper 31 by the conveyor 29, and is cut | disconnected finely along a longitudinal direction.

As a conventional method similar to subdividing and discharging the front and rear end chips of such a plastic board, irregular chips on the front and rear sides of the veneer veneer are pre-determined in the process of slicing. There is a method (for example, refer to Patent Document 1) in which the material is repeatedly finely divided into dimensions within a length and then dropped and discharged onto a scrap conveyor.
JP-A-7-156113.

  The conventional method for shredding front and rear end scraps of plastic boards described with reference to FIG. 4 has the following problems.

  As described above, when the cutting waste 26 is transferred from the conveyor 28 to the conveyor 29, the cutting scrap 26 falls in the center in the width direction of the conveyor 29 with the surface in the width direction hitting the partition 30 and the longitudinal direction thereof in the transport direction. At this time, since the partitions 30 are arranged upright, the cutting waste 26 that falls falls with the surface in the width direction hitting the partitions 30 facing up and down as it is or the surface in the width direction turns 90 degrees. And it falls in the state along the partition 30.

  In general, the thickness of the plastic board to be manufactured is about 12 mm at the maximum, but the cutting allowance of the cutting waste 26 (the length to be separated from the plastic board main body as waste) is about 30 mm. Therefore, as described above, if the surface in the width direction of the cutting waste 26 falls as it is in the vertical direction, the cutting thickness of the cutting waste 26 when chopping with the scrap chopper is about 12 mm. When the surface of the cutting waste 26 falls in a state where it is rotated 90 degrees (this state is called upright) and the state is maintained without falling down, the cutting thickness of the cutting waste 26 is about 30 mm. It also becomes.

  However, the maximum cutting thickness that can be cut by the scrap chopper is set based on the thickness of the plastic board to be cut, and is about 24 mm when the thickness of the plastic board is 12 mm. When the cutting waste 26 is carried in an upright state, the cutting waste 26 is not loaded into the scrap chopper and stays on the conveyor without being shredded. I will be forced to stop.

  In the method for subdividing the front and rear end scraps of the board disclosed in Patent Document 1, the cutting allowance is always the same as the board thickness of the non-upright cut scraps before entering the scrap chopper. As the cutting thickness is the same as the plate thickness even if the cutting waste stands upright, it will not be impossible to cut with the scrap chopper, but the cutting waste is subdivided. Therefore, it is difficult to reliably cut the leading edge and the rearmost end of the cutting waste to the same length as the plate thickness. If the cutting waste of this portion stands upright, cutting with a scrap chopper is not possible. It becomes possible.

  The present invention has been made in order to solve the above-described problems of the prior art, and since the cutting waste at the front and rear ends of the plastic board does not stand upright, the cutting waste can be shredded without trouble. An object of the present invention is to provide an upright prevention device for plastic board cutting waste.

  The apparatus for preventing uprights of plastic board cutting waste according to the present invention includes a slanted partition that drops on the conveyor by hitting the widthwise surface of the cutting waste at the front and rear ends of the plastic board, and the partition by blowing compressed air. And a compressed air jetting device that presses the cutting waste that has fallen onto the conveyor.

  In the plastic board cutting waste upright prevention device according to the present invention, even if the cutting waste dropped on the conveyor is in an upright state, the compressed air is blown by the compressed air injection device, and the cutting waste remains in the upright state. Press against the screen.

  The upright cutting waste pressed against the partition moves along the partition on the conveyor, but when the compressed air jetting device is moved away from the position where it is installed, it is tilted at the same inclination angle as that of the partition. Since the cut scraps have no compressed air pressure, they fall down due to their own weight and the upright state is eliminated.

  In addition, the inclination angle of the partition can be determined by the geometric cross-sectional shape in the direction orthogonal to the width direction of the cutting waste.

  According to the present invention, the cutting waste at the front and rear ends of the plastic board does not stand upright on the conveyor, so that it is not impossible to cut when cutting the cutting waste.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the plastic board cutting waste upright prevention device of the present invention. Since this upright prevention device is installed at the transfer position between the conveyor 28 and the conveyor 29 described in FIG. 4, the conveyor will be described with the same reference numerals as those in the figure.

  In this upright prevention device, the cutting waste 1 is installed at a transfer position from the conveyor 28 to the conveyor 29, the partition 2 installed on the conveyor 29 with the upper end inclined toward the conveyor 28, and the lower end portion of the partition 2 It is comprised from the compressed air injection nozzle 3 which injects compressed air toward.

The upright prevention device will be described in detail. The partition 2 is supported by the support member 4 so as to be positioned at the center in the width direction of the conveyor 29, and the support member 4 is connected from the conveyor 29 via the connection fitting 5. The member 6 is rotatably connected. And the bolt 7 which fixes the connection metal fitting 5 to the support member 4 is loosened, and the inclination angle θ of the partition 2 can be adjusted.

The cut scraps 1 at the front and rear ends of the cut plastic board are conveyed to the end of the conveyor 28 in a state where the longitudinal direction (the width direction of the board) is the width direction of the conveyor 28. Then, the cutting waste 1 leaves the conveyor 28 and the surface in the longitudinal direction hits the partition 2 and falls to the center in the width direction of the conveyor 29 so that the longitudinal direction faces the conveying direction of the conveyor 29.
Most of the cutting waste 1 dropped on the conveyor 29 is in a state in which the cutting allowance w is directed in the horizontal direction so that the thickness t is directed in the vertical direction as in the cross section shown in FIG. However, in some cases, as shown in the cross section shown in FIG. 2B, the cutting allowance w faces the vertical direction, that is, stands upright so that the thickness t faces the horizontal direction.

  When the cross section of the cutting waste 1 is conveyed as it is and inserted into the scrap chopper, the cutting thickness at the scrap chopper is the thickness t (generally, the thickness of the plastic board in FIG. 2A). In the case of FIG. 2B, the maximum is about 30 mm, which is the same as the cutting allowance w. Therefore, the upper limit (about 24 mm) of the cutting capacity of the scrap chopper is exceeded and cutting is impossible. It becomes.

  Therefore, the cutting waste 1 having a cross section as shown in FIG. 2 (a) is jetted with compressed air from the compressed air injection nozzle 3, and the cutting waste 1 in an upright state is pressed against the partition 2 and remains pressed. The cutting waste 1 is conveyed along the partition 2.

  Thus, if it conveys to the position where the pressing force of compressed air does not reach, since the cutting waste 1 inclines along the partition 2, it falls down by its own weight and an upright state is eliminated.

  As shown in FIG. 3, the inclination angle ω of the partition 2 in FIG. 1 is assumed to be a cross section of the upright cutting waste 1 that is most unlikely to fall and cannot be cut, and is formed by a long side a and a diagonal line c. If the angle is θ, it may be larger than θ.

  For example, if the long side a (cutting margin for cutting waste) in FIG. 3 is 24 mm and the short side b (plate thickness) is 12 mm, the inclination angle ω of the partition 2 can be obtained by the following equation (1).

ω> tan ⁻¹ (24/12) ………… (1)

It is sectional drawing of the upright prevention apparatus of the plastic board cutting waste of this invention. It is a figure which shows the cross section of the cutting waste which fell on the conveyor, (a) is what fell so that thickness may face a perpendicular direction, (b) is what fell so that thickness may face a horizontal direction. . It is a figure for demonstrating the inclination-angle of a partition. It is explanatory drawing of the cutting line which cuts off the front and back of a plastic board as cutting waste, (a) is a top view of a cutting line, (b) is a side view of a cutting line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting waste 2 Screen 3 Compressed air injection nozzle 4 Support member 5 Connection metal fitting 6 Connection member 7 Bolt

Claims (1)

A slanted partition that drops onto the conveyor by hitting the width direction surface of the cutting waste at the front and rear ends of the plastic board, and a compressed air injection device that blows the compressed air and presses the cutting waste that has dropped onto the conveyor to the partition A plastic board cutting waste upright prevention device characterized by comprising:

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