JP2001105472A - Diverter valve for extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a operation for taking out a waste raw material easy while improvement of stability of a suction pressure of a gear pump and improvement of a kneading degree of a raw material are achieved. SOLUTION: A passage is changed by horizontally moving a slide bar 18 of a diverter valve 10, and a discharging passage 18a for communicating a hole 14a of a barrel 14 on an extruder side onto a discharge side of an extruder side direction, an ordinally operating passage 18b for making the hole 14a of the barrel 14 on the gear pump side communicate with the extruder side by a hole of the same diameter as that of the hole 14a of the barrel 14, and a highly kneading passage 18f wherein a breaker plate 12 on which many small holes 12a making the hole 14a of the barrel 14 on the gear pump side communicate with the extruder side are formed, is provided, are formed to the slide bar 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diverter valve for an extruder which switches a flow path of a raw material which is put into a hole of a barrel and transferred by a screw.

[0002]

2. Description of the Related Art As a conventional diverter valve for an extruder, for example, the one shown in FIG. 3 is known.
The diverter valve 50 is arranged in the middle of the extruder, and has a slide bar 54 that moves vertically by a hydraulic cylinder 52. The slide bar 54 has a discharge passage 54a for connecting the hole 56a of the barrel 56 on the extruder side to the discharge side below the extruder, and the hole 56a of the barrel 56 on the extruder side has a hole 56a of the barrel 56 on the gear pump side.
a, which has an operation flow passage 54b communicating with a.

[0003]

However, the conventional diverter valve 50 as described above has the following problems. That is, the raw material is normally extruded from the hole of the die with the pushing force of the screw, but when the viscosity of the raw material is high, the pushing force of the screw alone is not enough and the material is forcedly extruded by the gear pump. However, when the suction pressure is increased, it becomes difficult to balance the screw output and the gear pump output, causing a phenomenon called hunting of the pressure on the suction side of the gear pump, resulting in a lack of stability and a loss of 20 km / cm ² or more. Difficult to set pressure.

[0004] Also, the raw material flowing along the wall surface may become a large unmelted lump, but the diverter valve 50 has a discharge flow path 54a and an operation flow path 54a.
b, only two flow paths are provided.
In the case of b, since the raw material coming from the extruder is simply flowed to the gear pump as it is, even if there is a large lump of raw material, the raw material may flow as it is, and the die hole may be clogged.

Further, the slide bar 54 is configured to switch the flow path by moving up and down, and the raw material is discharged from the discharge flow path 54a below the extruder. The removal of the raw material is an operation of sunk under the extruder, which makes the operation difficult and may cause an operator to come into contact with the heater for heating the raw material in the extruder body.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and it is an object of the present invention to improve the stability of the suction pressure of a gear pump, the kneading degree of raw materials, and the work of extracting waste raw materials. It is an object of the present invention to provide a diverter valve for an extruder that can perform the above.

[0007]

In order to solve the above-mentioned problems, the present invention relates to an extruder for extruding by heating, kneading and extruding a raw material charged into a hole (14a) of a barrel 14 while transferring the raw material by a screw. In a diverter valve (10) for an extruder, which is arranged in the middle and switches the flow path of the raw material,
The diverter valve (10) is connected to the extruder side by a discharge channel (18a) that connects the hole (14a) of the barrel (14) on the extruder side to the discharge side, and a hole (14a) of the barrel (14). The hole (14) in the barrel (14) on the gear pump side
a) a breaker in which a normal operation flow path (18b) communicating with a) and a number of small holes (12a) or slit holes communicating with the hole (14a) of the barrel (14) on the extruder side and the gear pump side are formed. And a high kneading channel (18f) provided with a plate (12).

As described above, by providing the diverter valve (10) with the breaker plate (12), the back pressure can be increased and energy can be added to the raw material.
The pressure at the screw discharge section can be set up to 100 kg / cm ² .

Further, a large unmelted mass can be divided into small pieces by passing through a large number of small holes (12a) or slit holes in the breaker plate (12).
Unmelted material in the raw material can be reduced, and the die is less likely to be clogged.

Further, the heat-degraded raw material during the start-up operation is discharged through the discharge flow path (18a), and the screw is rotated and kneaded and melted in the rotor or kneading disk by the normal operation flow path (18b). The kneading degree is higher than the normal kneading and melting for homogenization as in the case of low-viscosity products that are unlikely to have a screw share due to the high kneading channel (18f). Since necessary materials can be passed through, 3
The same effect can be achieved by switching one diverter valve (10).

Further, the invention according to claim 2 of the present invention is characterized in that the diverter valve (10) switches the flow path by moving in a horizontal direction.

As a result, the discharged raw material is discharged from the side of the extruder, so that it is not necessary to go under the extruder to take out the discharged raw material, and it is easy to perform the work. An operator does not come into contact with a certain heater. In addition, the code | symbol in said parenthesis shows the corresponding member of embodiment mentioned later.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the vicinity of a diverter valve 10 embodying the present invention, and FIG. 2 is a front view of a breaker plate 12. The diverter valve 10 according to the present embodiment is arranged in the middle of an extruder that heats, kneads and extrudes a raw material to be charged into the hole 14a of the barrel 14 while transferring the raw material by a screw (not shown). The diverter valve 10 includes a hydraulic cylinder 16 and a slide bar 18 which is moved in the horizontal direction by the hydraulic cylinder 16 and switches between three flow paths described later.

The slide bar 18 includes a discharge channel 18.
a, normal operation channel 18b and high kneading channel 18f;
Since the slide bar 18 moves in the horizontal direction and is not restricted by the height restriction with respect to the floor line, the length of the slide bar 18 is reduced by a discharge passage 18a to be described later. The length can be set such that the end of the discharge channel 18a is located at a position where the raw material to be taken out can be easily taken out.

The discharge channel 18a is provided in the hole 14 of the barrel 14.
a, one end of which has a hole 1 in the barrel 14 on the extruder side.
4a, the other end extends substantially in an “L” shape so as to open toward the side of the extruder.

The normal operation flow path 18b is constituted by the hole 14a of the barrel 14, and the hole 14a of the barrel 14 on the extruder side.
a and the hole 14a of the barrel 14 on the gear pump side.

The high-kneading flow path 18f has a large-diameter portion 18c having the same diameter as the hole 14a of the barrel 14 formed from the extruder side to the gear pump side at an intermediate position in the axial direction, and a large-diameter portion 18c. A small-diameter portion 18d having a shoulder portion 18g and having a smaller diameter than the large-diameter portion 18c formed at an intermediate position in the axial direction toward the gear pump side, and a hole 14a of the barrel 14 from the small-diameter portion 18d toward the gear pump side end. And a conical portion 18e that spreads out to a diameter.
The breaker plate 12 is fitted in the large diameter portion 18c.

The breaker plate 12 is in contact with the shoulder 18g and cannot be moved further to the gear pump side. As shown in FIG.
A large number of small holes 12a or slit holes are formed so as to communicate the hole 14a of No. 4 with the hole 14a of the barrel 14 on the gear pump side.

Next, the operation of this embodiment will be described. First, at the time of the rising operation, the hydraulic cylinder 16 is operated to move the slide bar 18 so that the discharge flow path 1 is moved.
8a is communicated with the hole 14a of the barrel 14. As a result, the thermally deteriorated raw material generated at the time of rising is discharged from the hole 14a of the barrel 14 on the extruder side to the side of the extruder through the discharge flow path 18a. The discharged raw material is easily removed at the side of the extruder without the operator getting under the extruder or coming into contact with the heater at the body of the extruder.

Next, when using ordinary raw materials which are sufficiently kneaded just by being kneaded and melted in the rotor portion or the kneading disk portion by rotation of the screw, the slide bar 18 is moved by operating the hydraulic cylinder 16. The normal operation flow path 18b is communicated with the hole 14a of the barrel 14 on the extruder side and the gear pump side. As a result, the raw material flows from the hole 14a of the barrel 14 on the extruder side through the normal operation flow path 18b.
To the hole 14a of the barrel 14 on the gear pump side.

Next, when using a raw material which requires a kneading degree equal to or higher than ordinary kneading and melting for homogenization, such as a low-viscosity product which is unlikely to have a screw share, the hydraulic cylinder 16 is operated to move the slide bar 18. The high kneading flow path 18f
Communication. As a result, the raw material is transferred from the hole 14a of the barrel 14 on the extruder side to the hole 14a of the barrel 14 on the gear pump side through the high kneading channel 18f. Since the raw material passes through many small holes 12a or slits of the breaker plate 12,
Further, since an appropriate resin pressure of up to 100 kg / cm ² is generated at the screw discharge portion, even if there is a large unmelted mass, it is divided into small pieces, and the unmelted material in the raw material is reduced.

Further, since the breaker plate 12 is provided, the back pressure can be increased to add energy to the raw material, so that the pressure setting at the screw discharge section can be set up to 100 kg / cm ^2. become.

[0023]

As described above, according to the present invention,
By providing a breaker plate diverter valve, it is possible to add energy to the raw material by increasing the back pressure, the pressure setting at the screw discharge unit 100 kg / cm ²
It is possible to set up to. Also, by passing through a large number of small holes or slit holes in the breaker plate, a large unmelted mass can be divided into small pieces,
Unmelted material in the raw material can be reduced, and the die is less likely to be clogged. Further, the heat-degraded raw material during the rising operation is discharged by the discharge passage, and the mixture is sufficiently kneaded just by being kneaded and melted in the rotor or the kneading disk by the rotation of the screw by the normal operation passage. Normal raw materials can be passed, and raw materials that require a kneading degree equal to or higher than normal kneading and melting for homogenization, such as low-viscosity products that are unlikely to have a screw share due to a high kneading channel, can be passed through. The same effect can be achieved by simply switching one diverter valve.

Further, according to the present invention, the discharged raw material is discharged from the side of the extruder, so that it is not necessary to go under the extruder to take out the discharged raw material. The worker does not come into contact with the heater in the torso.

[Brief description of the drawings]

FIG. 1 is a plan view showing the vicinity of a diverter valve according to the present invention.

FIG. 2 is a front view of a breaker plate.

FIG. 3 is a side view showing the vicinity of a conventional diverter valve.

[Explanation of symbols]

 Reference Signs List 10 Divertor valve 12 Breaker plate 14 Barrel 14a Hole 18 Slide bar 18a Discharge channel 18b Normal operation channel 18f High kneading channel

Claims (2)

[Claims] 1. An extruder for heating, kneading and extruding a raw material charged into a hole (14a) of a barrel (14) while transferring the raw material by a screw, and switching a flow path of the raw material. In the diverter valve (10) for an extruder, the diverter valve (10) includes a discharge channel (18a) that connects a hole (14a) of the barrel (14) on the extruder side to a discharge side, and a barrel (14). Of the barrel (14) on the extruder side and the gear pump side by the hole (14a).
a) a breaker in which a normal operation flow path (18b) communicating with a) and a number of small holes (12a) or slit holes communicating with the holes (14a) of the barrel (14) on the extruder side and the gear pump side are formed. A diverter valve for an extruder, comprising a high kneading flow path (18f) provided with a plate (12). 2. A diverter valve for an extruder according to claim 1, wherein said diverter valve (10) switches a flow path by moving in a horizontal direction.