JP2013086491A - Molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that the conventional molding machine is configured such that a main extruder is disposed in the longitudinal direction of the molding machine together with a head to be arranged in a line and auxiliary extruders are juxtaposed with the main extruder, therefore, it inevitably causes the length of a path, reaching from the tip of each auxiliary extruder to the head, to be much longer than a path reaching from the tip of the main extruder to the head, consequently, it is highly likely that a molten resin is easily carbonized in the middle of the path reaching from the tip of each auxiliary extruder to the head.SOLUTION: A molding machine is configured such that an auxiliary extruder 4, which extrudes a resin composition becoming an auxiliary material to a head 2, and the head 2 are extendingly provided in a line in the longitudinal direction of the molding machine, and a main extruder 3, which extrudes a resin composition becoming a main material to the head 2, is juxtaposed with the auxiliary extruder 4. As a result, it reduces the length of the resin path from the tip of the auxiliary extruder 4 to the head 2, thereby eliminating the possibility of carbonization of a molten resin.

Description

The present invention relates to a molding machine in which a sub-extruder for extruding a resin as a sub-material is provided in the longitudinal direction of the molding machine, and a main extruder for extruding a resin as a main material is provided along with the sub-extruder.

Molding machine, for example, a hollow molding machine, sends molten resin extruded from an extruder to a crosshead disposed at the tip of the extruder, hangs the parison downward from the crosshead, and a mold comprising a pair of split molds The mold is moved below the driving nozzle of the air driving device provided side by side on the cross head, and then air is blown from the lowered driving nozzle to expand the parison into the mold cavity to form the molded product. To do.

In such a molding machine, a single extruder may be used when molding a molded product having a single resin layer. However, when molding a molded product having two or more resin layers, the number of layers corresponds to the number of layers. An extruder for extruding a plurality of resins is used. In such a case, the extruder uses a main extruder that extrudes a resin that is a main material and a sub-extruder that is a sub-material different from the main material. The main extruder has a larger resin extrusion amount than the sub-extruder, and therefore has a larger capacity and weight than the sub-extruder.

As for the arrangement of these extruders, generally, the main extruder is arranged in a line with the head in the longitudinal direction of the molding machine, and the sub-extruder is shown in FIGS. 2 and 3 of Patent Document 1, for example. In addition, the main extruder is provided obliquely to the longitudinal direction of the molding machine.

JP 2004-160669 A

Due to the arrangement of the sub-extruder with respect to the main extruder, the length of the path from the front end of the sub-extruder to the head has to be considerably longer than the path from the front end of the main extruder to the head. There is a fear that the molten resin is easily carbonized.

The present invention is intended to solve the problem of such a conventional configuration, eliminates the risk of carbonization of the molten resin from the sub-extruder, and can mold a good-quality molded product. The object is to realize a molding machine.

In order to achieve the above object, the present invention extends a sub-extruder for extruding a resin composition as a sub-material to the head and the head in a row in the longitudinal direction of the molding machine, A molding machine characterized in that a main extruder for extruding the resin composition is provided in the sub-extruder.

Further, the second problem solving means is the same as the first problem solving means, provided with a rotating disk on which the main extruder is placed and turned on a horizontal plane.

The operation of the first problem solving means is as follows. The resin path from the tip of the sub-extruder to the head is shortened, and the fear of carbonization of the molten resin can be eliminated. On the other hand, the resin path from the leading end of the main extruder to the head is relatively longer than the resin path of the sub-extruder, but the amount of molten resin extruded from the main extruder is large, which may cause carbonization of the main molten resin. Can be eliminated.

The action of the second problem solving means is that when the main extruder is periodically disassembled and cleaned, in the case of the main extruder of the conventional arrangement, it is necessary to remove the head, and then remove the screw and disassemble and clean, In the case of the main extruder in the solution means, the rotary disk can be swung and the screw can be wiped off and disassembled and cleaned, and the head removal process is eliminated, so that the disassembly and cleaning work time can be greatly shortened. .

As described above, the molding machine of the present invention can eliminate the fear of carbonization of the molten resin from the sub-extruder and can mold a good quality molded product. The present invention can be applied to general extrusion molding machines such as hollow molding machines.

FIG. 1 is a front view of a hollow molding machine showing an embodiment of the present invention. FIG. 2 is a reduced plan view of the hollow molding machine shown in FIG. FIG. 3 is a reduced side view of the hollow molding machine shown in FIG. FIG. 4 is a reduced side view of the hollow molding machine shown in FIG. 1, omitting the main extruder and the air driving device. FIG. 5 is an enlarged plan view showing the periphery of the motor of the main extruder in the hollow molding machine shown in FIG. FIG. 6 is an enlarged side view showing the periphery of the motor of the main extruder in the hollow molding machine shown in FIG. FIG. 7 is an enlarged side view with a part cut away in the hollow molding machine shown in FIG.

Hereinafter, an embodiment of a molding machine according to the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 4, the hollow molding machine according to an embodiment of the present invention includes a frame base 1, and as a working unit for molding, a double-headed crosshead 2 and a crosshead 2 from the rear side. A horizontally placed main extruder 3 and a first sub-extruder 4 to be connected, a vertically placed second sub-extruder 5 to be connected from the front of the crosshead 2, a parison cutting device, a molding die 6, not shown, The apparatus includes a mold clamping device 7, an air driving device 8, a molding die / clamping device unit moving device 9 (not shown), and a molded product take-out device.

The first sub-extruder 4 includes a hopper 4a for charging a resin composition as a sub-material, and a screw not shown for transferring, kneading, melting, and discharging the sub-material resin composition inside the extruder. It has. This screw has a screw diameter of 30 mm or more, for example, and is driven to rotate by a motor 4b. The first sub-extruder 4 is provided on the rocking plate 10 so as to be aligned with the crosshead in the longitudinal direction of the hollow molding machine itself.

The main extruder 3 includes a hopper 3a for charging a resin composition as a main material, and includes an unillustrated screw for transferring, kneading, melting, and discharging the main material resin composition inside the extruder. ing. This screw is rotationally driven by a motor 3b. In general, the main extruder 3 is often an extruder using a pulverized material, and the amount of resin extruded is often larger than that of the first sub-extruder 4. In addition, when a pulverized material (resin that has undergone a thermal history) is used, carbonization is likely to occur, so that it is necessary to remove and clean the screw of the main extruder, but it can be easily cleaned without removing the crosshead 2. The screw is arranged in an oblique direction so that the screw can come out with respect to the longitudinal direction of the hollow molding machine itself.

The oscillating plate 10 is pivotally supported by a support portion 11 on the front side of the frame base 1 and is oscillatable about the support portion 11. A swing device 12 is provided behind the frame base 1 to swing the swing plate 10.

The oscillating device 12 is configured such that a nut of a moving body (not shown) is screwed to a ball screw 14 coupled to a servo motor 13 and a pair of links 15 coupled to the moving body is caused by sliding the moving body forward and backward. The rocking plate 10 is rocked by being tilted. In FIGS. 3 and 4, reference numeral 16 denotes a support frame for suspending the extruder tip and the head so as to keep them in a horizontal state as they are lowered by their own weight.

As shown in FIG. 5 and FIG. 6, a rotating disk 30 is provided on a rocking disk 10 having a lubricating oil applied to the upper surface thereof, and the main extruder 3 is rotated. The main extruder 3 is mounted on the rotating disk 30. A first slide board 40 that is placed and slid back and forth is provided, and a second slide board 50 that slides the main extruder 3 in a direction orthogonal to the front and rear direction is provided on the slide board 40.

The rotary disk 30 is used for the cooperative operation of the first rotating jig 31 that is pressed against the long side surface 30a and the second rotating jig 32 that is pressed against the inclined side surface 30b that is inclined with respect to the long side surface. The main extruder 3 can be turned around the rotation shaft 33. Both the first rotating jig 31 and the second rotating jig 32 include bolts 31a and 32a, bolt receivers 31b and 32b in which screw holes for screwing these bolts are formed, and nuts 31c and 32c for fastening the bolts. Thus, the bolt receivers 31 b and 32 b are fixed to the side surface of the rocking plate 10.

The rotary shaft 33 includes a disc-shaped stepped flat head 33 a for preventing slipping, and a bolt 33 b that connects the flat head 33 and the rocking plate 10.

Long holes 30c, 30d, 30e, 30f are formed on the circumference of the center of the rotary shaft 33 at four locations on the short side of the turntable 30, and bolts 30g, 30h, 30i, 30j are fitted in these long holes. Thus, the turntable 30 can be turned.

The planar quadrilateral first slide disc 40 can be pushed and pulled by the first slide jig 41 operating on one short side thereof, and slides in the front-rear direction on the sliding surface sheet 45 on the rotary disc 30 shown in FIG. It can be done. The stopper 42 provided on the other short side is for positioning the main extruder 3 in the front-rear direction.

The first slide jig 41 includes a bolt 41a that is screwed into a screw hole formed at the center of the short side of the first slide disk 40, and a bolt receiver that is fixed to the rotating disk 30 and has a hole that allows the bolt 41a to pass therethrough. 41b and a nut 41c that sandwiches both sides of the bolt receiver 41b together with the head of the bolt 41a. The stopper 42 includes a bolt 42 a, a bolt receiver 42 b that is fixed to the rotating disk 30 and has a screw hole in which a screw of the bolt is screwed, and a nut 42 c that holds the bolt.

The first slide board 40 has long holes 40a, 40b, 40c, 40d extending in the long side direction at four portions on the short side, and bolts 40e, 40f, 40g, 40h are fitted in the long holes. Thus, it can slide in the front-rear direction, which is the direction in which the long side extends.

The planar quadrilateral second slide disc 50 is a combination of a second slide jig 51 that presses against one end of one long side and a third slide jig 52 that presses against the other end of the long side. By the action, it slides in a direction perpendicular to the front-rear direction.

The second slide jig 51 includes a bolt 51a that is pressed against the long side, a bolt receiver 51b that is fixed to the first slide board 40 and has a screw hole into which a screw of the bolt is screwed, and a nut 51c that holds the bolt. It consists of. Similarly, the third slide jig 52 is fastened with a bolt 52a that is pressed against the long side, a bolt receiver 52b that is fixed to the first slide board 40 and has a screw hole into which a screw of the bolt is screwed, and the bolt is fastened. It consists of a nut 52c.

The second slide disc 50 has four long holes 50a, 50b, 50c, 50d extending in the short side direction at four portions on the long side, and bolts 50e, 50f, 50g, 50h in the long holes. Are fitted and can slide in a direction orthogonal to the front-rear direction of the second slide board 50. Although the long hole 50d is not shown, it is formed on the extension of the long side 50a in the short side direction, and a bolt 50h not shown is fitted therein.

Instead of the rocking plate 10 in the illustrated example, each of the main extruder 3 and the first sub-extruder 4 may be provided with an individual rocking plate similar to the rocking plate 10.

The second sub-extruder 5 processes a resin composition serving as a second sub-material different from the sub-material processed in the first sub-extruder 4 and includes a second sub-material charging hopper 5a. A screw (not shown) for transferring, kneading, melting and discharging the secondary material resin composition is provided inside the extruder. The second auxiliary material has a smaller amount of resin used for the molded product than the first auxiliary material. The screw of the second sub-extruder 5 has a screw diameter of about 20 mm, for example, and is driven to rotate by a motor 5b.

The main extruder 3 is provided with a connector 3c extending from the tip and having a path bent in a U-shape when viewed from above, and the first sub-extruder 4 is provided with a straight connector 4c when viewed from above. Is provided with a straight connector 5c as viewed from above, and these extruders are connected to the crosshead 2 through the respective connectors. The tip portions of the connector 3c and the connector 4c are a common connector box, and a passage to the crosshead 2 of the connector 3c and the connector 4c is formed in the box.

The parison cutting device (not shown) cuts the upper part of a cylindrical parison hanging from the cross head 2 and includes a cutter holder having an electric heating cutter.

The molding die 6 includes a pair of split molds 6a and 6b fixed to the front platen 20 and the rear platen 21, respectively. These split molds form cavities (not shown) for inserting a cylindrical parison into a hollow molded product. The molding die 6 is moved to a position immediately below the double-headed crosshead 2 and to a pair of air driving devices 8 by a moving device 9 of a molding die / clamping device unit including a motor 9a for moving the die and a pair of rails 9b. The air injection nozzles 8a, 8a are reciprocated alternately in the short direction of the hollow molding machine between the positions immediately below the air injection nozzles 8a, 8a.

As shown in FIG. 4, the mold clamping device 7 closes, clamps and opens the pair of split molds 6a and 6b, and includes a rotating disk (not shown) driven by an electric motor. Along with the rotation, the pair of links 7b and 7c coupled to the disk from the front and the rear are bent and extended to bring the rear platen 21 and the front platen 20 close to and away from each other with the parting line facing each other.

The air driving device 8 includes air driving nozzles 8 a and 8 a that are inserted into a cylindrical parison and blow compressed air above the pair of cavities of the molding die 6.

Next, the operation of the above embodiment will be described.

The resin composition is supplied to the corresponding hopper 3a of the main extruder 3, the hopper 4a of the first sub-extruder 4, and the hopper 5a of the second sub-extruder 5, respectively, to melt and soften these raw resin compositions, It is sent to the crosshead 2 through connectors 3c, 4c and 5c of the extruder. In the crosshead 2, these resin compositions are formed into three layers, extruded as a cylindrical parison, suspended, and housed in the cavities of the pair of split molds 6a and 6b in the mold open state.

Next, the pair of split molds 6a and 6b are closed and clamped by driving the mold clamping device 7, the lower end of the cylindrical parison is closed, and the upper end is cut by a parison cutting device (not shown). After raising the blow pin 8a, the molding die 6 is moved directly below the air driving device 8 by the moving device 9 of the molding die / clamping device unit (not shown), and a pair of air driving nozzles 8a, 8a. Is inserted into each of the two cylindrical parisons.

At this time, the cutting sleeve at the tip of the air injection nozzle 8a and the counter plate at the top of the molding die 6 come into contact with each other, and the excess resin portion (upper burr) at the top of the cylindrical parison is cut to open the mouth of the hollow molded product. And forming a hollow molded product by blowing air from the air injection nozzle 8a into the cylindrical parison, and the molded product is conveyed outside the molding machine by the molded product take-out device.

In the molding process described above, the resin composition as the first sub-material can eliminate carbonization due to resin sticking in the passage of the connector 4c because the connector 4c of the first sub-extruder 4 is straight.

The connector 3c of the main extruder 3 is longer than the length of the connector 4c of the first sub-extruder 4, so that the longitudinal dimension is long. However, since the amount of extrusion of the main material resin composition is large, the connector 3c is in the passage of the connector 3c. Does not cause the resin to stick.

The connector 5c of the second sub-extruder 5 can be shortened like the passage of the connector 4c of the first sub-extruder 4, and carbonization due to molten resin sticking in the middle of the path of the connector 5c can be eliminated.

Further, when disassembling and cleaning the main extruder 3, the rotary disk 30 is turned around the rotary shaft 33 using the first rotary jig 31 and the second rotary jig 32, Pull out the screw.

DESCRIPTION OF SYMBOLS 1 ... Frame base 2 ... Cross head 3 ... Main extruder 3c ... Connector 4 ... 1st subextruder 4c ... Connector 5 ... 2nd subextruder 5c ... Connector 10 ... Swing board 30 ... Rotary disk 33 ... Rotating shaft

Claims (2)

A sub-extruder for extruding a resin composition as a secondary material to the head and the head extend in a row in the longitudinal direction of the molding machine, and a main extruder for extruding the resin composition as a main material to the head A molding machine characterized by being attached to the sub-extruder. The molding machine according to claim 1, further comprising: a rotating disk on which the main extruder is placed and swiveled on a horizontal plane.

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