JPS61266206A - Control device for kneading of continuous kneading machine - Google Patents

Abstract

PURPOSE:To permit stabilized operation as well as wide regulation of degree of kneading with respect to various kinds of resin materials having wide viscosity range by a method wherein a movable dam for regulating the degree of kneading of the material, which is capable of regulating the amount of protrusion thereof, is provided between kneading blades of two sets of kneading rotors. CONSTITUTION:In a chamber 1, provided with two sets of kneading rotors 2, 2 movably in parallel, one set or plural sets of plate type or rod type movable dams 4 are arranged in the vicinity of discharging port 3 of kneaded material in a space 7 between the kneading blades of both rotors 2, 2 so that the protruding amount of lower end of the dam 4 can be adjusted freely by a driving unit 5. The kneading degree of resin material to be kneaded can be changed within wide range, therefore, the surging of a gear pump with respect to high- viscosity resin material, non-alignment of pellets due to the surging, vibration of machine, leakage of resin material from a sealing section with respect to low-viscosity resin material, feed neck trouble or the like may be eliminated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a continuous kneading machine, particularly a continuous kneading machine that kneads and melts various plastics, rubbers, and other plastic materials into a fluidized state, and supplies the fluidized state to a granulation facility or the like. In the type in which a gear pump is directly connected to the material discharge port as a discharge control means, stable operation can be achieved by actively adjusting the 444'4 kneading degree inside the kneader while keeping the gear pump's fee F condition constant. This product is intended for improving and stabilizing quality by performing proper and good kneading over a wide range of viscosity.

(Prior art) As a continuous kneader for various synthetic resin materials, GoJ1 is involved in the discharge and transfer of materials at its discharge port for mixed materials, and has a good effect on mixed materials by changing the rotation speed. Needless to say, a type in which a gear pump is directly connected is already known, and examples of prior art of this type include the following. One of them is related to Japanese Patent Publication No. 56-3091, although the illustration is omitted, and the details are given in the publication of the same number, but the one disclosed in the same number is a material discharge port in a kneading machine. By directly connecting a gear pump driven by a variable speed motor to the kneader, it is possible to change the filling degree of the material in the kneading machine by changing the rotational speed of the gear pump and changing the pressure of the pump (or extruder). It is characterized by controlling the strength of kneading by changing the wetted surface.
This is related to No. 10, and the details are given in the publication of the same No. 10, but the one disclosed in the No. 10 is also of the direct connection type between a continuous kneader and a gear pump, and has large pressure fluctuations (hunting phenomenon). occurrence), and in order to prevent stable operation from occurring, a kneading machine is installed in the chamber near the discharge port of the kneading machine, protruding into the space between the known kneading rotors installed in parallel. This system is characterized by the provision of an immovable fixed gap (dam) that blocks the axial flow of cross-conducting material to reduce pressure hunting, thereby achieving stable operating conditions.

(Problems to be Solved by the Invention) To summarize the prior art as seen in the two examples above, the technology disclosed in Japanese Patent Publication No. 56-3091 is theoretically the same. Although good results should be obtained with the system in question, in reality, there are a wide variety of plastic materials to be handled, each with slightly different physical properties, and the conditions under which they can be processed are also different. There will be times when it will fluctuate and you will not be able to operate stably.
To solve these problems, Japanese Unexamined Patent Application Publication No. 1986-
It can be said that No. 183210 occupies the position as one means of improvement. However, only with these conventional techniques,
The following problems still remain that need to be solved. In other words, most of the materials to be mixed in continuous kneading machines are plastic materials such as Go J1 and Plus Chitsuk, but recently materials such as Go J1 have been used, ranging from low viscosity to extremely high viscosity. , the viscosity range is extremely wide and diverse, and the content of kneading of this viscosity 31, +4 material, ? This is a factor that greatly affects the M dynamic state, and it is extremely difficult to adequately cover all materials just by changing the rotational speed in the gear pump. By installing a dam and blocking the axial flow of material,
There are problems in the following points. For example, when dealing with high-viscosity resin materials, the presence of the fixed dam causes the material to generate more heat, so it is necessary to keep the discharge pressure as low as possible. Stable operation cannot be expected due to fluctuations, and pump surging or
For example, uneven pellets and mechanical vibrations occur in the granulation equipment where the material is sent, and when dealing with low-viscosity resin materials, the heat generation of the material due to the presence of a fixed dam is insufficient, so the set If the pressure is increased, problems such as leakage of resin material from the shaft seal portion and generation of feednecks due to backflow of molten resin occur, and these problems are still difficult to solve using conventional techniques alone.

(Means for Solving the Problems) In order to solve the above problems, the present invention sets the material discharge pressure at the inlet of the gear pump to a value necessary for stable operation of the gear pump, and We have abolished the conventional technology that changes the material temperature during operation by changing the temperature of the material, and the foot condition in the gear pump is always constant, and the amount of protrusion into the chamber can be adjusted by changing the shear area and filling degree inside the kneading machine. By proactively adjusting the degree of kneading using a movable dam that can be freely installed, in other words, by actively adjusting the degree of kneading inside the kneader, more stable and effective operation can be obtained and problems can be solved. Specifically, in a chamber having a material supply port [-1 at one end and a material discharge port at the other end,
Two kneading rotors having kneading blades are arranged parallel to each other, and the material continuously supplied from the material supply port is kneaded by both rotors and discharged from the material discharge port, and the material is continuously supplied from the material supply port. In a continuous kneading machine that is directly connected to a gear pump as a discharge control means, a movable dam for adjusting the degree of material kneading is provided in the chamber and protrudes into the space between the kneading blades of both rotors so that its protrusion V can be freely adjusted. be.

(Function) According to the technical means of the present invention, as shown in FIG. 1 and FIG. Two kneading rotors 2, 2
chamber 1 is installed in parallel and I′if rotation.
In the illustrated example, one or more plate-shaped or rod-shaped movable dams 4 (two are illustrated in the illustrated example) are connected to both rotors 2, A suitable drive device 5 is installed in the space 7 between the kneading blades 2 and 2.
By arranging the dam 4 so that the amount of protrusion of the lower end thereof can be adjusted, the following effects can be obtained. That is, the third
The figure is a comparative graph showing that the degree of kneading of the resin material to be kneaded can be considerably changed by changing the dam shape. The temperature of the resin material is shown, and the horizontal axis shows the coordinates of the dams 4 with different widths and heights in order of size as I, dam, M dam, S Dano, No dam, and each The dam shape is as shown by the arrow at the bottom of the graph, but when kneading was performed under the same conditions using dams with different shapes,
As is clear from the transition of each mark shape in the graph, it was confirmed that considerable changes in the degree of kneading were obtained. By using a fixed dam 4 of 741g and a protrusion V inside the chamber 1 as a movable dam 4, the size of the protrusion V can be freely changed to actively control changes in the shear area and the degree of filling in the chamber 1. Therefore, by changing the position of the movable dam 4, the degree of kneading can be adjusted sufficiently and appropriately depending on the material.
In a gear pump that is directly connected to the material discharge port 3, the material pressure at the front of the pump input [1] is necessary for stable operation of the gear pump. In order to smoothly suction 14 and continuously transfer it to the next process, it is only necessary to control the rotational speed to maintain the material filling (clogging) state on the discharge [13 side] constant. By adjusting the degree of kneading using the il dynamic dam 4, it is possible to operate the kneader at a predetermined temperature or power. As a result, the problem mentioned above cannot be covered by changes in the rotational speed of the gear pump, or fixed dams, specifically the surging of the gear pump against high viscosity resin materials, and the uneven beresoton caused by this. Problems such as mechanical vibration, leakage of resin material from the sealing part for low-viscosity resin materials, and feed neck troubles can be solved.

(Example) Appropriate examples of the technical means of the present invention will be explained in the following figures. In FIGS. 1 and 2, two movable dams 4 are shown, but the number of movable dams 4 can be changed to one, depending on the scale of the kneading machine chamber 1, and the shape can be a flat plate. In addition to being able to effectively change the shear area and filling degree, it is also possible to adopt a shape that has the effect of blocking the internal flow. The installation position of the movable dam 4 is shown in the example in which it protrudes downward from the upper side of the chamber 1, but in this case, it is arranged so that it protrudes in one direction from the lower side of the chamber 1. It has the same effect, and although the installation position is effective depending on the entire length of the kneading blades on the kneading rotors 2, 2, the discharging blade side is particularly more effective than the return blade. The movable dam 4 is slidably provided on the outer wall of the chamber 1, but at this time it is necessary to interpose a sealing member 6 as shown in FIG. 2 to prevent leakage of the resin material. Further, the drive device 5 shown in this figure is configured such that the upper end of the movable dam 4 is attached to the swing link 5 which is pivotally supported on the bracket 9 by the pin shaft 10.
The example shows an indirect drive method in which the dam 4 is supported by a connecting portion formed by a long hole 13 and the protrusion amount of the dam 4 can be varied by swinging the link 5. Using a known motion mechanism, this is the fifth
A direct drive method shown in FIG. 8M may also be used. That is, FIG. 5 shows a structure in which a rack 14 is provided on the movable dam 4, and a pinion 16 of a drive shaft 15 is meshed with the rack 14.

Figure 6 shows one of the screw types, in which a screw shaft 16 is provided on the movable holder J, 4, and this is screwed into the wall 1, wheel 17 that rotates in an immovable position. Figure 8 shows the piston 19 of the cylinder 19 for fluid pressure and motor connected to the movable cylinder 4. 2 shows a screw shaft 21 integrally formed with a round bar type Ml dynamic dam 4, and the screw shaft 21 is screwed into a screw nut 22 to be moved up and down, and a drive means for adjusting the amount of protrusion thereof. Although not shown in the drawings, it is also possible to provide a plurality of dams 4 116 in the axial direction and to individually move each dam 4 up and down and change the dams 4.

FIG. 4 shows one example of the control system 1 of the apparatus of the present invention, and is shown schematically, but the continuous kneading machine main body 23 is equipped with a material supply 1-124 at one end, Each kneading blade ([!
,! Like Echi, forward wing (feeding wing), rear wing (returning wing)
, discharge blades, etc.) are installed in parallel and rotatably, the other end is a +til discharge port 3, and a gear pump 25 is provided directly connected to the discharge [13]. Reference numeral 26 indicates a foot screw section provided on the 1-2 side corresponding to the material supply port 23. In controlling the moving dam 4 (1, dam' that issues a command to the drive device 5): An inlet 11-ra 27 is provided, and the same device 27 supplies materials, a feeder fl to l supply 1124 (i-supply from the drive motor 29 of the i-feeder ff28, and a drive motor of Rotor rotation speed from 30 (16, also material discharge) 1j
The temperature sensor 31 and the transmitter; ≦2 shown in FIG. In contrast, the control of the gear pump 25 is performed by controlling the material outlet 113 as shown in FIG.
and by the estrous device 34 (, as mentioned earlier, the gear 4
The pressure 41'i required for stable operation of the pump 25 can be set to this set value, and then set to -C.

(Effects of the Invention) The present invention is extremely wide-ranging compared to the conventional gear pump that only changes the rotation j*torque, or the technology that adds a fixed dam to 1'1. Stable operation for various resins +4f-1 with IL viscosity range? It is extremely advantageous in that it can realize the contents of R training.

In other words, the kneading content is controlled by changing the rotational speed of the gear pump due to changes in the pressure. We have solved the problems that occur with materials, such as the difficulty in stable operation of gear pumps, and the foot-neck problems caused by resin leakage and resin backflow. Stable operation is achieved, and the content of the kneading in the chamber is actively changed by changing the protrusion of the movable dam, and by adjusting the temperature and power to the specified temperature and power, it can be used for a wide variety of resin materials of high and low viscosity without any problems. Therefore, it is excellent as a kneading control means for this type of product.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of main parts of an embodiment of the device of the present invention, Fig. 2 is a longitudinal sectional side view of the same, Fig. 3 is a comparison graph of dam shape and kneading degree change, and Fig. 4 is a control system for the embodiment of the device. FIGS. 5 to 8 are explanatory diagrams of an embodiment of the movable dam Ii1 contact movable type. 1...chamber, 2,2...I:I-evening, 3...
・) 4f1 discharge port, 4...Movable valve l5.5...Drive device, 23...Continuous kneading machine main body, 24...Material supply 1.25...Gear pump.Patent applicant Kobe Steel, Ltd. 1 Co., Ltd.
- (Ri・)4/UshiR&lHη1μt2ko Figure 8

Claims (1)

[Claims] 1. In a chamber having a material supply port at one end and a material discharge port at the other end, two kneading rotors having kneading blades are arranged parallel to each other, and the material continuously supplied from the material supply port is In the continuous kneading machine, the material is kneaded by both rotors and discharged from the material discharge port, and is directly connected to the material discharge port and equipped with a gear pump serving as a discharge control means. A kneading control device for a continuous kneading machine characterized by being provided with a movable dam for adjusting the degree of material kneading that protrudes so as to freely adjust the amount of protrusion.