JPH0615642A - Molding device of multiple belt - Google Patents

Abstract

PURPOSE:To obtain a multiple belt molding device which corresponds widely to physical properties of a plastic material, can use efficiently a surface area of a belt conveyor while running stably at a high speed and has the particularly small size as compared with a conventional steel belt conveyor molding device having the same function. CONSTITUTION:An upper and lower conveyors facing on each other are bent in a U-shaped state, stuck close to each other so that parts of them fit in alternately each other and pulleys 5-9 each are arranged on a main body frame 14 so that an area where pinch molding can be performed over at least a half of a surface area of a belt of the conveyor. Steel belts 3, 4 are wound up around the same and fitted in an endless state. Belt meandering correcting devices 11, 12 which have the high radius of curvature and a plurality of guide rollers are arranged on a position where tension becomes a loosening side when the belt is run. The device is in such constitution that a material casting device 2 and cooling devices 19, 20 incorporated respectively into an upper part of an upper belt conveyor and the rear of the steel belt and a coarse crusher 13 is provided on a final end part of a lower side conveyor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a plastic material having a property of solidifying under a certain condition to the belt surfaces of a pair of traveling steel belt conveyors, and sandwiches the plastic material between the upper and lower gaps of the belt to make a constant. The present invention relates to a multi-belt molding apparatus for giving a plate-shaped or band-shaped molded product by giving the operating conditions of.

[0002]

2. Description of the Related Art Among these conventional devices, there is a known double belt forming device. This is a device in which opposing steel belt conveyors are linearly stacked in two steps, and molding is performed between them. To do. Alternatively, there has been a form in which a resin belt is wound around a single drum.

[0003]

[Problems to be Solved by the Invention] A plastic material having a property of solidifying under a certain condition is sandwiched between steel belts,
When heating, cooling, or pressing is applied from the backside of the steel belt, the conventional molding machines are not efficient because the area where the plastic material can be sandwiched between the molding operations is less than half of the conveyor belt surface area. It was As a result, the size of the device is large and the price is high.

In the steel belts facing each other,
The larger the mutual winding area is, the more the thrust forces due to the belt meandering interfere with each other and are amplified. Conventionally, in order to prevent the belt from meandering, V-shaped rubber guides are attached to the back side of the belt over the entire circumference of the belt on both sides in the belt width direction, and the driven pulley is inclined, but this is not sufficient. However, there is a problem that the V-shaped rubber guide is out of the track and cannot run due to damage or wear.

The present invention is applicable to a wide range of physical properties of a plastic material, and enables the belt surface area of the belt conveyor to be efficiently utilized for the molding operation while stably traveling at high speed. In comparison, the size is remarkably small and an inexpensive multiple belt forming apparatus is obtained.

[0006]

In order to solve the above-mentioned problems, in the multiple belt forming apparatus of the present invention, the steel belt conveyors facing each other are curved in a U-shape, and they are closely contacted so that parts thereof are alternately fitted. The structure will be changed. By arranging the conveyor pulley and the guide roller so as to form such a track, the area that can be sandwiched and formed can be half or more of the belt surface area of the conveyor.

Further, in order to reduce or cancel the thrust force due to the belt meandering and correct the belt to the central position, an arc having a curvature larger than that of the driving or driven pulley is provided at the position where the belt is loosened by the belt driving force. As shown, a plurality of guide rollers are arranged. The relative position of both side plates that support the plurality of guide rollers is changed to give a circumferential length difference to the orbits of the belt edges on both sides to change the belt tension.

[0008]

The operation will be described with reference to FIGS. 1 and 2. The opposing steel belt conveyors are curved in a U-shape as shown in FIG. 1, and pulleys or guide rollers are arranged so that parts thereof are alternately fitted. For example, under the condition that the radius of curvature (R) of the guide roller is within 1.5 times the pulley diameter (D), the linear distance (P) between the mutually fitted and overlapping pulleys is the circumference of the pulley. 0.
By arranging them so that the length is 5 times or more, the circumferential lengths (L2) that overlap each other do not overlap (L1 or L
It is possible to construct a multi-belt molding device that overlaps geometrically longer than 3) and can use more than half of the surface area of the conveyor for molding operations.

In this overlapping multiple belt forming apparatus,
The lower pulley of the lower belt conveyor is the driving pulley, and the others are driven pulleys. Each of the driven pulleys of the upper and lower conveyors applies tension to the belt by hydraulic pressure, pneumatic pressure, springs, or the like. The tension of this belt is
The adhesion between the pulley and the belt that make up the conveyor,
It acts to increase the adhesion between the belts generated at the curved portion of the pulley. Therefore, when the rubber-lined drive pulley is rotated by a motor, the lower belt runs due to the frictional force due to this adhesion force, and is further transmitted to the upper belt by the frictional force between the upper and lower belts. If the sliding resistance is in the range of the driving force of the motor, the upper and lower belts are simultaneously driven without slip.

When the belt meanders in either the left or right direction, a thrust force (F) due to the meandering is generated in the belt width direction. As shown in FIG. 2, the thrust force (F) due to the meandering acts on the belt edge position detection rollers (11a) provided on the left and right edges of the belt. Belt meandering amount (x)
Accordingly, the operation arm (11b) is tilted, and the guide roller supporting side plate (11d) is advanced by the displacement amount (y) by the high lead ball screw unit (11C). The other belt edge side retracts in the opposite direction. As a result, the meandering correction device (11) composed of a plurality of guide rollers
There is a difference in circumferential length between the left and right tracks of the belt, and a tension difference occurs at the belt edge. Due to the nature of the steel belt (3) to move towards this lower tension, the belt is rectified to meander so that it constantly returns to its central position.

When the belt travels, the lower belt has a slack side on the traveling direction with the drive pulley as a boundary, and
The opposite side is the tension side. Similarly, with the upper belt surface in contact with the lower drive pulley as a boundary, the running direction side is the loose side and the opposite direction side is the tension side. The meandering correction device (11) is arranged at a position on the loosening side of the belt, and the larger the curvature (R) of the guide roller, the larger the tension difference and the greater the meandering correction effect. Also,
The closer the belt edge detection roller (11a) is to the guide roller in the running direction, the more quickly this correction operation is performed.

[0012]

EXAMPLE An example will be described with reference to FIG.
This example shows a belt multi-molding apparatus in which a flowable material is cast on a belt, cooled and solidified, and processed into a flaky product by a coarse crusher. In this molding apparatus, a lower conveyor part that is roughly divided into a U-shape and an upper conveyor part of the same shape in which the lower half is fitted to the lower conveyor part are attached to the main body frame 14 and are attached to the upper part of the upper conveyor. The material casting device 2 and the cooling devices 19 and 20 are incorporated in the back surface of the steel belt, and the coarse crusher 13 is provided at the end of the lower conveyor.

A belt meandering correction device 12 having a drive pulley 9, a lower head pulley 6, a lower tension pulley 8 and a plurality of guide rollers is arranged as shown in the figure so that the lower conveyor has a U-shape. Then, the steel belt 4 is wound around this and the ends are welded so as to form an endless shape. Similarly, the lower part of the upper conveyor is fitted to the upper part of the lower conveyor, and the pulleys 5 and 7 and the belt meandering correction device 11 are arranged so that the steel belt 3 has a U-shape.
Attach. The steel belts 3 and 4 of each conveyor are
The tension is applied to the belts by the belt tension tensioning devices 15 and 16 attached to the tension pulleys 7 and 8 to enhance the adhesion between the belts of the upper and lower conveyors and between the pulleys and the belts. In the belt meandering correction devices 11 and 12, the belt edge position detection rollers 11a and 12a are in contact with both edges in the width direction at the center position of the belt, and moreover, the plurality of guide rollers 11e and 12e are perpendicular to the belt traveling direction. Then, the ball screw units 11c and 12c are turned to adjust the angles of the operation arms 11b and 12b.

When the drive pulley 9 lined with rubber is rotated by the drive motor 10 through the transmission component, the steel belt 4 closely attached to the pulley runs. When the belt runs, the belt meandering correction device 12 arranged at a position where the tension of the belt is on the slack side is automatically corrected according to the amount of edge meandering of the belt so that the belt runs in the center of the track. Similarly, the steel belt 3 of the upper conveyor, which is in close contact with the steel belt 4 of the lower conveyor, travels while being entrained by the frictional force.

In the traveling upper and lower conveyors, the molten plastic material 1a is cast on the upper surface of the steel belt 3 by the material casting device provided on the upper portion of the upper conveyor. At this time, in the upper and lower conveyors, the take-up units 17 and 18 attached to the head pulleys 5 and 6 at the upper part of the conveyor make the gaps between the pulleys uniform in the belt width direction, and according to the degree of hardening and rigidity of the material. When the predetermined gap is formed, the unevenness at the time of casting is smoothed and a product having a predetermined thickness is formed.

The belts 3 and 4 which are superposed on each other are
The cooling devices 19 and 20 provided on the upper and lower sides of the back surface indirectly cool and solidify via a steel belt. The solidified material is crushed by the coarse crusher 13 provided at the end of the lower conveyor, and the flake-shaped molded product 1b is continuously obtained.
In addition to the belt meandering prevention, V-shaped rubber guides are attached to both sides in the belt width direction over the entire circumference on the back side of the belt as a weir to prevent belt meandering and to transmit driving force and to flow cooling water to the back side of the upper belt. be able to. The belt meandering correction device described above has a mechanical structure, but an electric sensor is used for edge detection, or an actuator for correction operation is pneumatically operated.
Alternatively, the hydraulic pressure, the electric motor, or the like can be electrically controlled.

[0017]

Since the present invention is constructed as described above, it has the following effects.

Since the multi-belt structure in which the upper and lower belts are curved and fitted together can occupy more than half of the belt surface area in the molding operation, the size is significantly smaller than that of the steel belt conveyor molding apparatus having the same molding capacity as before. Therefore, an inexpensive device can be obtained.

Since the cast material can be rolled by head pulleys sandwiched by upper and lower belts, it is possible to perform a wide range of molding operations corresponding to the physical properties of the plastic material such as viscosity, curing degree, casting characteristics, softening point and the like. At the same time, a molded product having a uniform thickness can be obtained.

The belt meandering correction device is arranged on the loose side of the belt tension, and since the plurality of guide rollers having large curvatures constantly perform the correction operation proportional to the meandering amount, the belt runs at the central position. As a result, stable running can be obtained even during high-speed running, and high-speed molding operation can be performed, so that the molding capacity of the apparatus is enhanced. Further, the V-shaped rubber guide provided on the back side of the belt is less worn and damaged, and the service life is extended.

[Brief description of drawings]

FIG. 1 is an arrangement view of pulleys and guide rollers that form a multi-belt forming apparatus.

FIG. 2 is an enlarged view showing the operation of the belt meandering correction device.

FIG. 3 is an overall side view showing an embodiment of a multi-belt forming apparatus.

[Explanation of symbols]

1 plastic material (-a cast state material, -b solid pulverized state material) 2 material casting device 3 upper steel belt 4 lower steel belt 5 upper head pulley 6 lower head pulley 7 upper tension pulley 8 lower side Tension pulley 9 Drive pulley 10 Drive motor 11 Upper belt meandering correction device (-a belt edge position detection roller, -b operation arm, -c ball screw unit, -d guide roller support side plate, -e guide roller,-
f Connecting spring) 12 Lower belt meandering straightening device (same as above) 13 Coarse crusher 14 Body frame 15 Upper belt tension tensioning device 16 Lower belt tension tensioning device 17 Upper head pulley take-up unit 18 Lower head pulley take-up Unit 19 Upper belt cooling device 20 Lower belt cooling device

Claims (2)

[Claims] 1. When sandwiching and forming a plastic material having a property of solidifying under a certain condition between opposed steel belt conveyors, the respective conveyors are curved in a U-shape and alternately fitted to each other to form a plastic material. A multiple belt forming apparatus in which a pulley or a guide roller is arranged so as to wind more than half of the belt surface area of a conveyor. 2. A plurality of a plurality of belts are arranged in a steel belt conveyor in a path along which a belt passes and run so as to draw an arc having a larger curvature than that of a drive or driven pulley at a position on the loose side due to the driving force of the belt. The belt forming apparatus according to claim 1, further comprising a belt meandering correction mechanism using the guide roller.