JPH0899313A - Kneading control device of continuous kneading machine - Google Patents

Abstract

PURPOSE: To manufacture a kneading control device inexpensively, by a method wherein kneading control of a chamber possessing a supply port and discharge port and two rotors having kneading vanes is performed by a movable dam whose distance position of diametral direction is adjustable freely to a rotor between the supply port and discharge port and a gear pump arranged on a downstream side of the discharge port. CONSTITUTION: A material supplied through a supply port 2 by a feed device 6 is sent to a kneading blade part B by a screw part A of two rotors 5 whose relative position of an axial direction is immovable within a chamber 4, plasticized and molten by kneading and shearing action. The material is passed through between a circular section part C and the movable dam 8 which are on a downstream side of the kneading vane part B, the temperature and pressure of the material are changed by a change of a passing area and extruded to a discharge port 3 by a feed blade part D. Then discharged to a post treatment device at necessary pressure by a gear pump 7. Therefore, a passing area of the material can be changed up to the ful open state from 0, control range of a degree of kneading is made large by the dam 8 and kneading of a high viscous material can be performed stably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kneading control device for a continuous kneading machine in which a plastic material such as plastic or rubber is continuously plasticized and melted to knead additives, fillers and the like.

[0002]

2. Description of the Related Art For example, in a plastic continuous kneader, two rotors having kneading blades are arranged in parallel in a chamber having a supply port and a discharge port, and a kneading material additive supplied from the supply port and The filler and the like are kneaded by a rotor, plasticized and melted, and discharged from an outlet.

In order to improve the quality of this kneaded product, various kneading control devices for controlling the kneading degree, pressure or temperature during the kneading operation have been developed. As a conventional technique of this kneading control device, first, there is one disclosed in Japanese Patent Publication No. 56-3091. In this first technique, a gear pump for feeding the kneading material to the post-treatment device is directly connected to the downstream side of the discharge port of the chamber, the rotation speed of the gear pump is controlled by a variable motor, and the pressure at the inlet of the gear pump is controlled. By controlling, the filling degree of the material in the chamber is changed, and the kneading degree is adjusted.

This first technique has a sufficient effect that it can be used for kneading a resin having a low viscosity, but in kneading a high viscosity resin, since the pushing force of the rotor is small, the efficiency of biting into the teeth of the gear pump is high. May deteriorate, a hunting phenomenon of pressure may occur, the melting start point of the resin may fluctuate, and unstable operation may occur. As an improvement to solve the problem of the first technique, the second technique of controlling the kneading degree by adjusting the material supply amount to the supply port and the axial flow of the material in the vicinity of the discharge port. There is a third technique (see Japanese Patent Laid-Open No. 58-183210) for controlling the pressure and temperature by providing a blocking dam.

The second technique has a small adverse effect on the kneading action, but has a small effect, and has a problem of poor control response. The third technique is effective for a resin having a certain viscosity. However, if the viscosity of the resin is different, it is difficult to handle. The fourth technique shown in FIG. 5 (Japanese Patent Laid-Open No. 60-107999 and drawings) solves the problem by organically combining the advantages of the first to third techniques.

In the fourth technique, a gear pump 7 is arranged on the downstream side of the discharge port 3 of the chamber 4, a feed device 6 is arranged above the supply port 2, and a movable dam 8'is provided near the discharge port 3. The gear pump 7 detects the pressure at the inlet with the sensor P1C, controls the variable motor M4 within a range in which the gear pump 7 can be stably operated, keeps the feed condition by the feed device 6 constant, and keeps the temperature of the discharge port 3 constant. Sensor T
1C, the rotational speed of the rotor motor M2, feed conditions, etc. are input to the dam controller 14, and the shear area, filling degree, etc. in the chamber 4 are changed by the movable dam 8 ', so that resins with a wide range of viscosities can be obtained. It enables stable and effective kneading.

On the other hand, although a method of adjusting the kneading degree is different, as a technique capable of adjusting the kneading degree in the same manner and enabling high-efficiency kneading by a gear pump, Japanese Patent Laid-Open No. 61-2335.
08 (fifth technology) is disclosed. This fifth
The technology is a cylinder that has a supply port and a discharge port and is movable in the axial direction, two cantilever-supported screws that have a kneading blade part and are arranged in parallel in the cylinder, and a supply port of the cylinder. And a slot formed by the cylinder and the screw, which is arranged between the discharge port and the discharge port, and a gear pump arranged on the downstream side of the discharge port opened in the cylinder axial direction,
The slot is slot adjusted by adjusting the position of the cylinder in the axial direction with respect to the screw.
The screw has a tip screw having a diameter smaller than that of the kneading blade portion from the slot to the front of the discharge port.

[0008]

However, also in the fourth technique, the movable dam 8'is opposed to the kneading blade portion B which is long in the axial direction of the rotor 5 but has a small cross-sectional area.
The shielding change amount of the material is small, and the resin temperature or pressure on the discharge port 3 side hardly changes. On the contrary, the pressure or temperature of the material at the time of passing the movable dam 8 ′ is affected by the control of the gear pump 7. Control can be difficult or inaccurate. In addition, since the rotor 5 itself does not have the extrusion capability in the vicinity of the discharge port 3, it is difficult to solve the problem of the high viscosity resin biting into the gear pump 7.

In the fifth technique, the tip screw portion is effective for forcibly feeding the kneading material to the gear pump to improve the bite in the gear pump, but when the slot portion is formed in the screw, the kneading blade is inevitably formed. When the diameter of the tip screw is smaller than that of the cylinder and the cylinder moves axially, the distance between the tip screw and the gear pump changes, and the length of the tip screw that overlaps the cylinder and the length from the tip of the tip screw to the gear pump are changed. The fluctuation of the height changes the suction pressure of the gear pump. In addition, in the structure in which the cylinder is movable, not only the cylinder but also the gear pump and the post-treatment device on the downstream side of the cylinder need to be movable, which occupies an extremely large cost and requires high accuracy. It makes fine kneading adjustment difficult.

According to the present invention, the rotor is axially fixed to the cylinder in the axial direction, the circular section and the feed section are formed on the downstream side of the kneading blade section of the rotor, and the rotor is opposed to the movable dam substantially along the circular section. The edges can be formed to allow the material passage area to be changed significantly, and the material is forcibly sent to the gear pump by the feed wing so that the control by the gear pump does not affect the control by the movable dam and at a low cost. An object of the present invention is to provide a kneading control device for a continuous kneader that can be manufactured.

[0011]

A concrete structure for solving the problems in the present invention is as follows: a chamber 4 having a supply port 2 and a discharge port 3; Two rotors 5 that are arranged and fixed in the axial position with respect to the chamber 4, and movable between the supply port 2 and the discharge port 3 of the chamber 4 so that the radial perspective position can be adjusted relative to the rotor 5. A dam 8 and a gear pump 7 arranged on the downstream side of the discharge port 3 are provided, and the movable dam 8 opposes and substantially extends along a circular section C formed on the downstream side of the kneading blade section B of the rotor 5. A screw-shaped feed blade portion D having a diameter substantially the same as that of the kneading blade portion B is formed on the rotor 5 at the downstream side of the circular portion C in order to forcefully push the kneading material to the gear pump 7 in the rotor 5. There is something to do.

[0012]

The material fed from the feed port 2 by the feed device 6 is sent to the kneading blade portion B by the screw portions A of the two rotors 5 whose axial relative positions are immovable in the chamber 4, and is kneaded and sheared. Upon receipt, it is plasticized and melted. The plasticized and melted material has a circular cross section C on the downstream side of the kneading blade B.
And the movable dam 8, and is strongly extruded to the discharge port 3 by the feed blade portion D, and is discharged to the post-processing device at a required pressure by the gear pump 7.

The movable dam 8 has opposed edges 12 that extend substantially along the outer peripheral surface 11 of the circular section C, and the distance between the circular section C and the material passing area therebetween can be reduced by adjusting the perspective position in the radial direction. It can be greatly changed from zero to the fully open state of the chamber 4, and the material passage area is changed to control the temperature and pressure of the material. Since the material of the gear pump 7 is forcibly pushed by the feed blade portion D having substantially the same diameter as the kneading blade portion B, the biting failure does not occur, the ability is not suppressed, and the gear pump 7 is The material supply control to the processing device is interrupted by the feed blade portion D and does not affect the control by the movable dam 8.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, a continuous kneading machine 1 has two rotors 5 arranged in parallel in a chamber 4 having a supply port 2 and a discharge port 3, and a feed device 6 above the supply port 2 and a discharge port. A gear pump 7 is disposed below the switch 3, and a movable dam 8 is disposed in the middle of the supply port 2 and the discharge port 3.

The feed device 6 is of a type in which the feed screw 10 is driven by a variable motor M1 and supplies kneading materials such as plastic and rubber, additives, fillers and the like to the supply port 2 in required amounts. The two rotors 5 have the same shape and are adjacent to each other in a meshed state, are synchronously rotated by the motor M2, are axially fixed in position with respect to the chamber 4, and are downstream from the screw portion A located on the supply port 2 side. A kneading blade portion B, a circular section C and a feeding blade portion D are sequentially formed on the side.

The screw part A and the kneading blade part B are shown in FIG.
With a substantially triangular cross section shown in 4, knead while feeding the material,
When it is plasticized and melted by pressure and heat and passes through the circular section C, the kneading work is almost completed, and the feeding blade section D mainly pushes the molten material to the discharge port 3. As shown in FIG. 1, the feed blade portion D has substantially the same shape as the screw portion A and has the same diameter as the kneading blade portion B, and extends from the downstream side of the circular section C to the discharge port 3. ing.

The chamber 4 facing the feed blade portion D
A vent 9 is formed in this area, so that volatile components generated from the material can be discharged during the kneading. The vent 9 prevents feed inhibition caused by backflow of volatile components to the supply port 2. The movable dam 8 is provided as a pair of upper and lower parts facing the circular section C. Circular section C
The outer peripheral surface 11 has a diameter slightly smaller than the inner diameter of the chamber 4,
Each of the upper and lower movable dams 8 has a facing edge 12 that substantially extends along the outer peripheral surface 11.

That is, the facing edge 12 is formed by arranging side-by-side arcuate surfaces having the same or slightly larger curvature as the outer peripheral surface 11, and it is possible to adjust the perspective position in the radial direction with respect to the circular section C by the motor M3. There is. The motor M3 of the vertically movable dam 8 is composed of one motor or two synchronized motors, and the vertically movable dam 8 can be moved by the same amount in the opposite direction via a rack and pinion mechanism or a screw jack mechanism. . Further, the vertically movable dam 8 may be driven by a hydraulic cylinder.

By adjusting the position of the upper and lower movable dams 8 with respect to the circular section C, the material passage area can be changed from substantially zero to the fully open state in the chamber 4.
By narrowing the area, the flow resistance of the material is increased,
The temperature and pressure are increased. TIC and PIC are a temperature sensor and a pressure sensor that measure the temperature and pressure of the passing material and control the motor M3. Therefore, the temperature or pressure of the material is measured, and when the required kneading degree is not reached, the motor M3 is operated, the movable dam 8 adjusts the gate between the circular cross section C and the kneading degree is controlled (melting). Adjust the starting point).

The gear pump 7 is a motor M as in the prior art.
4 is driven by the pressure sensor P
The measurement is performed by IC, and the motor M4 is controlled to adjust the supply amount of the kneading material to the post-processing device. The gear pump 7 is particularly useful for a high-viscosity material that is difficult to supply to the post-processing device only by feeding the material by the feed blade portion D, and the pressure change due to the control causes the feed blade portion D to forcibly feed the material. Therefore, it is not propagated to the material during the kneading operation, and the control by the movable dam 8 and the control by the gear pump 7 are independent.

[0021]

According to the present invention described in detail above, since the movable dam 8 has the opposing line 12 that faces the circular cross section C of the rotor 5 and substantially extends along the circular cross section C of the rotor 5, the movable dam 8 is located between the rotor 5 and the chamber 4. It is possible to change the material passage area of from 0 to full open, it is possible to increase the range of controlling the kneading degree by changing the flow resistance of the material, it is possible to effective kneading control, Since the rotor 5 is provided with the feed blade portion D forcibly pushing the material to the discharge port 3, it is possible to reduce the material feeding failure in the gear pump 7 and to smoothly transfer the material to the post-processing device. Even if the gear pump 7 is controlled to supply, the control does not affect the kneading control by the movable dam 8, the kneading control can be accurately and easily performed, and even when kneading a high-viscosity material, Can drive stably.

The suction pressure of the gear pump 7 can be changed by providing a movable dam 8 which can adjust the radial perspective position in comparison with the prior art in which the chamber 4 is axially moved to adjust the slot. The kneading degree can be adjusted without adjusting the rotor 5 and the rotor 5 is fixed in the axial direction with respect to the chamber 4 so that the chamber 4 and the gear pump 7 do not move. By realizing the high accuracy and forming the screw-shaped feed blade portion D having substantially the same diameter as the kneading blade portion B on the downstream side of the circular section C, even if the suction pressure varies slightly, the movable dam 8 It is possible to prevent the influence of the fluctuation of the kneading material temperature on the side and to secure a large capacity discharge to the gear pump 7.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory diagram showing a fourth conventional technique.

[Explanation of symbols]

 1 Continuous Kneader 2 Supply Port 3 Discharge Port 4 Chamber 5 Rotor 6 Feed Device 7 Gear Pump 8 Movable Dam 12 Opposing Edge A Screw Part B Kneading Blade C C Cross Section D Feed Wing

Claims (1)

[Claims] 1. A chamber (4) having a supply port (2) and an exhaust port (3), and a kneading blade part (B), which are arranged in parallel in the chamber (4) and are provided in the chamber (4). On the other hand, between the two rotors (5) whose positions are fixed in the axial direction, and the supply port (2) and the discharge port (3) of the chamber (4), the radial and perspective positions of the rotor (5) can be freely adjusted. It comprises a movable dam (8) provided and a gear pump (7) arranged on the downstream side of the discharge port (3), said movable dam (8) being the kneading blade part (B) of the rotor (5). Has a facing edge (12) facing and substantially along the circular section (C) formed on the downstream side of the rotor, and the rotor (5) has a circular section for forcing the kneading material to the gear pump (7). A screw-shaped feed blade portion (D) having substantially the same diameter as the kneading blade portion (B) is formed on the downstream side of (C). Kneading control device for continuous kneader.