JPH08142046A - Rotor of kneader for rubbery article - Google Patents

Abstract

PURPOSE: To eliminate the adhesion of rubber to the lower part of the inner peripheral surface of the casing of a kneader while reducing the closing inferiority trouble of a discharge door by reducing the gap between short blades and making the height of a connection part less than that of the short blades. CONSTITUTION: Long blades 7-9 and short blades 10-12 are respectively provided by two or more so as to be separated from each other at an equal angle and the cut-in angle formed by the rear surfaces 7a-9a in an advance direction of the long blades 7-9 and the tangential line at the outer end of each of the long blades 7-9 is set to 40 deg. or more. The height in the radius direction of the short blades 10-12 of a rotor is set to a degree not exceeding the height in the radius direction of the long blades 7-9. Further, the height in the radius direction of the mutual connection parts 15-17 of the long and short blades 7-9, 10-12 of the rotor is made less than that of the short blades 10-12. By this constitution, the gap between the short blades is reduced to prevent the generation of a deposit to the inner peripheral surface of a casing and rubber passages are ensured to prevent a kneading time from becoming long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor used in an apparatus for kneading a rubber-like material in a chamber by rotating the rotor.

[0002]

2. Description of the Related Art A description will be given below with reference to FIG. 6 showing a cross section of a main part of a kneading apparatus and FIGS. 7 and 8 showing development views of a conventional rotor. In FIG. 6, generally, rubber used for a tire or the like is kneaded with a raw material rubber put into a mixing chamber 02 of a kneading device 01 or a chemical such as carbon or sulfur by rotation of a pair of rotors 04, 05. It is obtained by On the surfaces of the rotors 04 and 05 used at this time, blades extending in the radial direction and spirally twisted are formed, and the charged raw rubber and carbon or chemicals are indicated by the arrows of the rotors 04 and 05. When the rotor 04, 05 passes through the gap provided between the outer ends of the rotors 04, 05 in the radial direction and the inner peripheral surface of the casing 010, the rotor 04 passes over the ends while receiving shearing force. , 05 axially. This action is long wings 0
7. When the rubber 03 in the chamber 02 reaches a predetermined temperature for a predetermined period of time or when the rubber 03 in the chamber 02 reaches a predetermined temperature, the rotor 04, When the discharge door 06 provided at the lower portion of the casing 010 is opened downward while the rotation of 05 continues, the rubber 03 is dropped downward and discharged. In addition,
The discharge door 06 extends to the vicinity of the inner peripheral surfaces on both sides of the casing 010 on the axial side of the rotors 04 and 05, and has almost the same length as the rotors 04 and 05. Less than,
In this way, the rubber 03 is mass-produced while continuing the batch processing in the kneading device 01 one after another. Further, conventionally, the cutting angle P formed by the back surface 07a of each long blade 07 of the rotors 04 and 05 and the tangent line N at the tip of each long blade 07 is made larger than 40 degrees.

Conventionally, in a pair of rotors 04 and 05 used in such a kneading apparatus 01, as shown in FIG. 7 which is a development view of the rotor 04 and FIG. 8 which is a development view of the rotor 05, Two or more long blades 07 extending in the radial direction and spirally twisted and two short blades 08 connected to the long blades 07 and having opposite twist directions are formed at equal angular intervals (Figs. 6 and 7). , 8), the height of the short blade 08 in the radial direction is considerably lower than the height of the long blade 07 in the radial direction. Further, a connecting portion 09 parallel to the axis is formed at a location where the long blade 07 and the short blade 08 are connected, and the radial height of the connecting portion 09 is the same as the height of the short blade 08. . The tip of the short blade 08 and the casing 010
The gap provided between the inner peripheral surface and the inner peripheral surface was considerably large. The rotor 04 and the rotor 05 are arranged such that the long and short blades 07 and 08 are arranged in opposite directions in the twisting direction and the axial direction. That is, in one rotor 04, the long blades 07 are arranged from one end 013 in the axial direction to the central portion, and the short blades 08 are arranged in the vicinity of the other end 014 in the axial direction. Short blades 08 are arranged in the vicinity of one end 013 in the axial direction from the end 014 to the central portion, and the rotors 04 and 05 rotate while advancing in the directions of the arrows shown in FIGS. here,
The long blade is a blade whose axial length K is 1/2 or more of the axial length M of the rotors 04 and 05. Due to this, there are problems as described below.

[0004]

As described above, the short wings 08
Since the above-mentioned gap is considerably enlarged, the discharge door 06
Even after the rubber 03 has been opened and the rubber 03 has been discharged, in the axial direction in the vicinity of the discharge door 06, the inner peripheral surface of the casing 010 from the connecting portion 09 to the short blades 08 has a rubber 03 as shown in FIG.
The adhered substance 011 adheres and remains. Then, while the discharge door 06 is open, the adhering matter 011 is removed from the discharge door 0.
6 and the casing 010 are projected to the contact surface 012, the discharge door 0 is closed when the discharge door 06 is closed.
There is a problem that the discharge door is not properly closed because 6 does not close completely. Once this discharge door closing failure trouble occurs, the continuous operation is no longer possible, and the worker slips into the chamber 02 and removes the deposit 011 attached to the inner peripheral surface of the casing 010 and the contact surface 012. Need to be eliminated. However, since the adhered substance 011 adheres very strongly, it is a very troublesome work, and it takes a considerably long time to remove it, and it is a very dangerous work as well as hindering the productivity. Therefore, there is an urgent need to completely eliminate such troubles. Therefore, an object of the present invention is to provide a rotor for a kneading device for a rubber-like material capable of eliminating the adhesion of rubber to the lower portion of the inner peripheral surface of the casing as described above and eliminating the trouble of defective closing of the discharge door. It is in.

[0005]

Then, as a result of earnestly testing and researching by the present inventor, the following was found out. First, raise the height of the short blade so that it does not exceed the height of the long blade to reduce the gap between the inner peripheral surface of the casing and the tip of the short blade. It was investigated whether it occurred at the bottom. Then, the rubber deposits disappeared, but the amount of rubber passing over the tip and passing through the tip was reduced while being crushed in the gap between the inner peripheral surface of the casing and the tip of the short blade, and the rubber kneading time was reduced. It took a long time and productivity became poor.

Then, as a result of further repeating the test, the height of the short blade was increased to the extent that it did not exceed the height of the long blade, and then the rubber was passed through the passage through the tip. In order to ensure, if the height of the connection between the long and short blades is lower than the height of the short blades, the rubber kneading time does not take long, and the deposits of rubber on the inner peripheral surface of the casing are It turned out to be almost gone. From this, the above-mentioned problems are
In the mixing chamber sealed by the casing, two or more spiral long blades extending in the radial direction and short blades connected to the long blades and having opposite twist directions are provided at equal angles, respectively. A pair of parallel rotors rotating in opposite directions for kneading the rubber-like material charged in the chamber are arranged, and connecting portions of these long and short blades are arranged at the delay end in the rotation direction, and each long blade is arranged. The cutting angle formed by the back surface in the advancing direction of each of the long blades and the tangent line at the tip which is the outer end in the radial direction of each long blade is set to be larger than 40 degrees. , The short blade is arranged at the other end in the axial direction, and in the other rotor, the long blade is arranged at the other end and the central portion in the axial direction,
In a rotor for a kneading device for rubber-like materials in which short blades are arranged at one end in the axial direction, the radial height of the short blades of each rotor is set higher than the radial height of the long blades, and This can be solved by making the radial height of the connecting portion between the long and short blades lower than the height of the short blade.

Further, as described in claim 2, the positions of the respective connecting portions are arranged so as to be offset from each other so that the positions of the respective connecting portions in the same rotor are not the same in the axial direction. It has been found that by using the rotor for a kneading device for a rubber-like material according to claim 1, the rubber deposits on the inner peripheral surface of the casing are completely eliminated, and the rotor becomes more effective.

[0008]

Next, the operation according to claim 1 of the present invention will be described. Conventionally, rubber deposits adhering to the inner peripheral surface of the casing have been generated from the connecting portion to the short blade side because the gap between the inner peripheral surface of the casing and the tip of the blade, which is the outer end in the radial direction of the blade, is large. Therefore, if the height of the short blades is made high enough not to exceed the height of the long blades to reduce the gap between the short blades, the deposits on the inner peripheral surface of the casing do not occur. Here, the twisting directions of the long and short blades formed on the same rotor surface are opposite to each other, and the connecting portion of the long and short blades is arranged at the rotational delay end. Then, part of the rubber in the chamber during kneading passes through while being crushed by passing over the tip of the blade from the gap of the rotating rotor of the long and short blades, and the remaining rubber by the twist inclination of the long and short blades. It flows and collects on the side of the connecting portion, passes over the tip of the blade from the gap between the connecting portion and the short blade, passes through while being ground, and is kneaded. However, in the present invention, since the gap between the short blades is made small, the resistance of the collected rubber over the tip of the short blade and passing while being ground is increased, and the kneading time is lengthened. However, in the present invention, in addition to this, the height of the connecting portion is made lower than the height of the short blade, so that a rubber passage can be secured and the kneading time does not increase.

Next, the operation according to claim 2 of the present invention will be described. As described above, since the height of each of the connecting portions is made lower than the height of the short blades in order to secure the rubber passage, there is a concern that rubber deposits may be generated on the inner peripheral surface of the casing corresponding to these connecting portions. There is. Therefore, the positions of these connecting portions existing in the same rotor are shifted in the axial direction so that all of them do not overlap in a straight line in the circumferential direction when the rotor is rotated. As a result, even if a deposit of rubber is generated on the inner peripheral surface of the casing corresponding to one connection portion, the tips of the other blades displace the deposit, so that the deposit is completely eliminated.

[0010]

【Example】

[First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, which shows a cross section of the main part of the kneading device, the kneading device 1 has a chamber 3 formed by a casing 2, and a pair of rotors 4 and 5 arranged horizontally in parallel are provided in the chamber 3. The rotors 4 and 5 are housed and are rotatably supported by the casing 2. One rotor 4 has a cylindrical shaft portion 6 and two or more (three in this embodiment) long blades 7, 8, 9 integrally formed with the shaft portion 6.
And have. Each of the long wings 7, 8, 9 has a spiral shape, extends outward in the radial direction, and is separated from each other by an equal angle. Further, as shown in FIG. 2 which is a development view of the rotor 4, the long blades 7, 8 and 9 are arranged at one end and the center of the rotor 4 in the axial direction, that is, from one end 13 in the axial direction to the other end 14 in the axial direction.
It extends to the vicinity and is twisted at a constant angle C with respect to a line parallel to the axis of the rotor 4. These long wings 7,
One end of the axial direction 8 and the other end of the axial direction 9 are located at the rotationally delayed end. The cutting angle R formed by the back surface 7a, 8a, 9a of the long blades 7, 8, 9 in the traveling direction and the tangent line M at the tip which is the radial outer end of each long blade 7, 8, 9 is larger than 40 degrees. The angle is smaller than 140 degrees, and a predetermined gap is provided between the tips of the long blades 7, 8, 9 and the inner peripheral surface of the casing 2.

At the other end of the rotor 4 in the axial direction, short blades 10, 11 connected to the respective long blades 7, 8, 9 are provided.
Two or more (three in this case) 12 are provided, and these short blades 10, 11 and 12 extend outward in the radial direction and are arranged at equal angles apart from each other like the long blades 7, 8 and 9. ing. Further, the radial heights of these short blades 10, 11, 12 are set to be slightly lower than or equal to the radial heights of the long blades 7, 8, 9 so as to be the same. In addition, long wings 7,
Connection portions 15, 16 and 17 parallel to the axis shown by hatching are formed in the portions where the short blades 8, 9 and the short blades 10, 11 and 12 are respectively connected.
The radial heights of 5, 16, 17 are short blades 10, 11, 12
Is smaller than the height of the connecting portions 15, 16 and 17 and the distance between the inner peripheral surface of the casing 2 is increased.

Further, as shown in FIG. 3, the other rotor 5
Similarly to the one rotor 4, the long blades 7, 8, 9 and the short blades 10, 11, 12 are provided. In this rotor 5, the long blades 7, 8, 9 are the other ends in the axial direction. 14 to the vicinity of one end 13 in the axial direction, and the short blades 10, 11,
12 is arranged at the one end 13 side in the axial direction. When the pair of rotors 4 and 5 are rotated in opposite directions as indicated by arrows by a driving device (not shown), raw rubber, carbon or chemicals introduced into the chamber 3 from an upper hopper port (not shown). And the like are kneaded by the long blades 7, 8, 9 and the short blades 10, 11, 12 of these rotors 4, 5. Then, when the rubber 18 in the chamber 3 reaches a predetermined temperature for a predetermined time, the plasticity of the rubber 18 is lowered and the dispersion of carbon or chemicals is made uniform, and the discharge door 19 is opened downward. Discharge 18. With this structure of the rotors 4 and 5, as described in the above-mentioned operation, almost no rubber deposits are formed on the inner peripheral surface of the casing 2, and the trouble of the discharge door closing failure is almost eliminated. lost.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. 4 and 5 are exploded views of the rotor according to the second embodiment, which will be described with reference to the drawings. The rotors 20 and 21 of the second embodiment and the rotor 4 of the first embodiment described above,
5 is the connecting portion between the long blade and the short blade, and the other portions are the same. Therefore, in FIGS. 4 and 5, the same portions as those in FIGS. Not explained in order. The connecting portions 22, 23 shown by hatching are formed at the portions where the long blades 7, 8 and the short blades 10, 11 of one rotor 20 are connected, respectively, and the height of these connecting portions 22, 23 is increased. The height is lower than the height of the short wings 10, 11. The connecting portion 17 is the first embodiment.
It is the same as the connection part 17 of FIGS. When the rotor 20 is rotated, the connecting portion 22 is included in the area X drawn by the width W of the connecting portion 17 by ½ W in the axial direction, and the remaining ½ W is the area 7b closed by the long blade 7. There is. Similarly, in the connecting portion 23, the connecting portion 23 is included in the area X drawn by the width W of the connecting portion 17 by ½ W in the axial direction, and the remaining ½ W is the area 11 b occupied by the short blade 11. Has become. In this way, the axial positions of the connecting portions 17, 22, 23 are formed so that their axial positions are shifted so that they do not completely overlap each other.
When 0 is rotated, no rubber deposit is generated on the inner peripheral surface of the casing 2 through all the connecting portions 17, 22, 23. Even if rubber adheres to the inner peripheral surface of the casing 2 after passing through all the connecting portions 17, 22, and 23, the long blades 7b and the short blades 11b are in the region of the width W,
Since the intervals between the tips of the long blades 7b and the short blades 11b and the inner peripheral surface of the casing 2 are such that no deposits are generated, the tips of the long blades 7b and the short blades 11b are used to remove the deposits. Rotate.

Further, as shown in FIG. 5, the other rotor 21
Similarly to the one rotor 20, the connecting portions 25 and 26 shown by hatching are formed at the portions where the long blades 7 and 8 are connected to the short blades 10 and 11, respectively. The height of the portions 25 and 26 is lower than the height of the short blades 10 and 11. Then, like the rotor 20, the axial positions of the connecting portions 17, 25, and 26 of the rotor 21 are formed so that their axial positions do not completely overlap with each other. Therefore, as described in the section of the above-described action, when the rotor 21 is rotated, the rubber deposit does not occur on the inner peripheral surface of the casing 2 through all the connecting portions 17, 25 and 26. As a result, when kneading was performed by the pair of rotors 20 and 21, no rubber adhered to the inner peripheral surface of the casing 2 at all. As a result, the trouble of closing the discharge door was completely eliminated, and the factors that hinder productivity and dangerous work could be eliminated. In addition,
The above-described embodiments are merely examples of the present invention, and various modifications can be made within the scope of the claims.

[0015]

As described above, according to the present invention, it is possible to prevent the adhesion of rubber to the inner peripheral surface of the casing of the kneading device and eliminate the trouble of the defective closing of the discharge door.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a main part of a kneading device.

FIG. 2 is a development view of the rotor of the first embodiment.

FIG. 3 is a development view of the rotor of the first embodiment.

FIG. 4 is a development view of a rotor according to a second embodiment.

FIG. 5 is a development view of the rotor of the second embodiment.

FIG. 6 is a view showing a cross section of a main part of the kneading device.

FIG. 7 is a development view of a conventional rotor.

FIG. 8 is a development view of a conventional rotor.

[Explanation of symbols]

01: Kneading device 02: Chamber 03: Rubber 04, 05: Rotor 06: Discharge door 07: Long blade 07a: Back surface 08: Short blade 09: Connection portion 010: Casing 011:
Attached matter 012: Contact surface 013:
One end 014: Other end K, M: Length M, N: Tangent line P, R: Cutting angle 1: Kneading device 2: Casing 3: Chamber 4, 5: Rotor 6: Shaft part 7, 8, 9: Long blade 7a , 8a, 9a: back surface 10, 11, 12:
Short blade 13: One end 14: Other end 15, 16, 17: Connection part 18:
Rubber 19: Discharge door 20, 21: Rotor 22, 23, 25, 26: Connection part 7b, 11b:
Area C: Angle W: Width X: Area

Claims (2)

[Claims] 1. A mixing chamber hermetically sealed by a casing is provided with two or more spiral long blades extending in a radial direction and short blades connected to the long blades and having opposite twisting directions at equal angles. A pair of parallel rotors, which rotate in the opposite direction and knead the rubber-like material charged into the chamber by the rotation thereof, are arranged, and a connecting portion between these long and short blades is arranged at the delay end in the rotation direction. In addition, the cutting angle formed by the back surface of each long blade in the traveling direction and the tangent line at the tip that is the outer end in the radial direction of each long blade is set to be larger than 40 degrees. A short blade is arranged at the other end in the axial direction at one end and at the center,
In the other rotor, the long blades are arranged at the other end and the center in the axial direction, and the short blades are arranged at one end in the axial direction. A rubber-like material characterized in that the height of the rotor is set to a level not exceeding the radial height of the blades, and the radial height of the connecting portion between the long and short blades of each rotor is set lower than the height of the short blades. Rotor for kneading equipment. 2. The rubber-like article according to claim 1, wherein the positions of the respective connecting portions in the same rotor are offset from each other so that the positions of the respective connecting portions are not the same in the axial direction. Rotor for kneading equipment.