JPS5852896Y2 - Conveyor device for sand supply in centrifugal molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveyor device for feeding sand in a centrifugal molding machine.

FIG. 1 shows an example of a centrifugal molding machine, in which the upper part of the rotation axis 1 shows the time when the receiving end is being formed, and the lower part shows the time when the whole part is being formed.

Reference numeral 2 is a rotary type, which is rotatable around the rotation axis 1 via a plurality of rolls 3, and the rotational power is applied from the roll 3 side.

Reference numerals 4 and 5 denote end jigs that are attached to both ends of the rotary mold 2, and the inner ends thereof have cylindrical parts 4A and 5A that can be fitted into the rotary mold 2, and a collar part 4B that can come into contact with the outer surface of the rotary mold 2. , 5B, and the flanges 4B, 5B are fixed to the rotary mold 2 side via a fixture 6.7.

Reference numeral 8 denotes a cylindrical receiver that fits inside the mouth side end face jig 7 and is movable in one direction of the rotation axis, and is an mouth inner face regulating tool, and this receiver projects inwardly with respect to the mouth side end face jig 7. By doing so, the bogata uke covers the inner circumferential surface of the mouth.

A ball 10 is provided on the inner surface of the mouth-side end face jig 7, and the ball 10 is biased inwardly by a spring 9, and the receiver is separated in the direction of the rotation axis 1 on the outer surface of the mouth-side end face restrictor 8. Recesses 11 and 12 into which the ball 10 can be elastically fitted are formed at two locations.

The positions of these recesses 11 and 12 are such that the ball 10 fits into the recess 11 when the inner surface of the mouth-side end jig 7 and the inner surface of the mouth-side restrictor 8 are flush with each other. The receiver is designed such that the ball 10 fits into the recess 12 when the mouth inner surface regulating device 8 covers the inner circumferential surface of the mouth.

In the receiver, a release material chamber 13 is formed on the inner peripheral surface of the mouth end jig 5, and seals 14 and 15 are provided on both sides of the mold release material chamber 13.

The receiver is provided with a rotary pushing device 16 that can come into contact with the outer end surface of the mouth inner surface regulating device 8.

This rotary pushing device 16 is composed of a cylinder 17 and an idler roll 18 that is attached to the piston rod and can come into contact with the outer end surface.

The inner surface of the spigot side end face jig 4 and the inner surface of the mouth inner surface regulating tool 8 have a tapered surface 19.20 which is more outward than the inner diameter.
It is formed.

Furthermore, inward annular projections 21 and 22 are formed at the inner ends of both tapered surfaces 19 and 20.

In the centrifugal molding machine having the above configuration, the portion above the rotation axis 1 indicates the time of molding the mouth portion of the receiver.

That is, the mouth inner surface regulating device 8 has moved outward, and its position is maintained by fitting the ball 10 into the recess 11.

In this state, while rotating the rotary mold 2 around the rotation axis 1, the insertion side end face jig 4 or the holder is passed through the center through hole of the mouth inner surface regulating device 8, and the holder of the rotary mold 2 is inserted into the resin through the mouth part. Materials such as liquid, reinforcing fibers, and sand are supplied, and the receiver is at the mouth part 23.
Perform centrifugal molding in a.

In the figure, a sand supply pipe 25 having a screw 24 installed therein is shown, and sand 26 is supplied from its tip.

Next, the rotary pushing device 16 is activated, and the receiver pushes the oral inner surface restricting device 8 by a predetermined amount via the advancing idler roll 18.

This pushed-in position is maintained by the ball 10 fitting into the recess 12.

Next, material is supplied onto the inner surface of the rotary mold 2 from the spout molding surface to the body molding surface in the same manner as described above, thereby centrifugally molding the tube 23 as shown below the rotation axis 1.

When feeding the material, some of the material may spill into the mouth side end jig 4 and the mouth inner surface regulating device 8, but this is automatically discharged by the outward-opening tapered surface 19.20. It turns out.

Furthermore, since the annular protrusions 21 and 22 are located at the inner edge of the spout of the tube 23 and the inner edge of the shoulder part, there is no possibility of scratches in the iron part.

In the centrifugal molding machine as described above, the sand 26 is supplied while moving the sand supply pipe 25 in the direction of arrow A by running the cart.

At that time, the rotational speed of the screw 24 cannot be suddenly made constant, and therefore, as shown in FIG. Thus, during intermediate drive, the expected average supply amount V2 is obtained, and before the drive is stopped, the supply amount gradually increases to ■3.

In this way, the part where the supply amount ■1 gradually increases and the supply amount V3 gradually decreases becomes a sand thinning phenomenon, becomes rich in resin, and cracks occur.

Furthermore, in reality, sand 26 must be supplied to the lower side of the annular protrusions 21 and 22 after the drive is started and before the drive is stopped, so a large amount of sand 26 must be supplied as shown in FIG. 3.

The present invention proposes a sand supply conveyor device for a centrifugal molding machine that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 4 to 7.

Reference numeral 30 denotes an outer cylindrical body having a receiving port 31 at its base end, and a hopper 32 is connected above the receiving port 31.

Reference numeral 33 denotes a screw disposed within the outer cylindrical body 30, which is composed of a hollow screw shaft 36 rotatably supported by bearings 34 and 35, and a screw blade 37 attached to the outer periphery of the hollow screw shaft 36. .

The inside of the hollow screw shaft 36 is formed with an air flow path 38, and this air flow path 38 is connected to the outer cylinder body 3 through a large number of air jet holes 39 provided in the length direction of the hollow screw shaft 36.
It is open within 0.

The base end of the hollow screw shaft 36 protrudes from the outer cylindrical body 30,
A rotary joint 40 is provided here to communicate the air flow path 38 and the air supply hose 41.

42 is an air supply device, and 43 is a flow rate regulating valve.

Furthermore, the base end of the hollow screw shaft 36 is attached to a winding transmission device 44.
The rotary drive device 47 is interlocked with the rotary drive device 47 via the rotary drive device 47.

The screw blade 37 has a pitch P near the tip.
1 is made smaller than the pitch P2 on the proximal end side.

In order to obtain such a pitch change, in the embodiment, a double blade type is used near the tip, but this may be a type in which a single blade is used with a reduced pitch.

A plurality of discharge ports 46 are formed at the tip of the outer cylindrical body 30 with a current plate 45 interposed therebetween.

These discharge ports 46 are small to medium in the length direction, but have sufficient width in the width direction.

Furthermore, the discharge ports 4 are provided on both front and rear sides of the groups of
Air nozzles 48 and 49 are provided on the sixth group side and facing diagonally downward.

These air nozzles 48 and 49 are connected to air supply hoses 50 and 50, respectively.
．． 51 to a switching valve 52, and the switching valve 52 is connected to the air supply device 42.

According to the sand supply conveyor device having the above configuration, the hopper 3
The sand in 2 falls into the outer cylindrical body 30 from the receiving port 31, is conveyed by the rotating screw 33, and is then discharged from the discharge port 46.

During the conveyance, the pulsations are eliminated by the air jetted from the air jet holes 39, and the pulsations are further eliminated by being sent at a small pitch P1 near the tip.

Therefore, the sand is discharged from the discharge port 46 without pulsation and is supplied onto the molding surface of the rotary mold 2.

At this time, the sand is rectified by a rectifier plate 45 to regulate its directionality.

In such sand supply, the drive of the screw 33 is started when the discharge port 46 group is connected to the annular protrusion 22, as shown in FIG.
It is performed while facing the

If this continues, the sand 53 will be forced out through the tapered surface 20, but at this time, air is ejected from the air nozzle 49, blowing the sand 53 inward and making it climb over the annular protrusion 22.

When the group of discharge ports 46 is located inside the annular protrusion 22, air is ejected from the other air nozzle 48, as shown in FIG. 7, and the sand 53 can be pushed under the annular protrusion 22.

When the intermediate portion is moved, the switching valve 52 is locked and air jetting from the air nozzles 48, 49 is stopped.

The same process is performed on the other annular protrusion 21 side.

As described above, according to the present invention, by controlling the air jets from the two air nozzles, it is possible to supply a large amount of sand after the screw starts driving and before it stops, thereby preventing the sand thinning phenomenon. This makes it possible to form tubes without cracks.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view showing an example of a centrifugal molding machine, Figure 2 is a
Fig. 3 is a graph showing sand supply, Fig. 4 is a longitudinal sectional front view showing an embodiment of the present invention, and Fig. 5 is B-B in Fig. 4.
The sectional view and FIGS. 6 and 7 are front views of the main parts showing the operating state. 21.22...Annular protrusion, 30...Outer cylinder, 31...Intake port, 33...Screw, 42... Air supply device, 45...
... rectifying plate, 46... discharge port, 48.49...
...Air nozzle, 52...Switching valve, 53.
·····sand.

Claims (1)

[Scope of utility model registration request] It has an outer cylindrical body having an inlet at the base end, and a screw disposed inside the outer cylindrical body, and a plurality of discharge ports are formed at the tip of the outer cylindrical body through a rectifying plate, and a group of these discharge ports is formed. 1. A sand supply conveyor device for a centrifugal molding machine, characterized in that air nozzles are provided on both front and rear sides of the machine, the air nozzles facing diagonally downward on the side of the discharge port group.