JP3129966B2 - Closed pressure kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to closed pressure kneading in which a kneading material such as rubber, plastic, ceramic or the like pressurized by a pressing mechanism is kneaded in a kneading tank by rotating a kneading rotor equipped with blades. For the machine, more specifically, "rub" between the land surface constituting the rotating outer peripheral surface of the kneading rotor blade and the inner wall surface of the kneading tank.
A tangential rotor-type closed pressure kneader having a kneading structure as described above, or by rotating a concave portion and a convex portion formed in the kneading rotor so as to mesh with each other, by a difference in a circumferential length of the concave portion and the convex portion. The present invention relates to an improvement in a kneading machine which can be applied to an interlocking rotor-type closed pressure kneading machine having a structure of kneading by "rubbing".

[0002]

2. Description of the Related Art As illustrated in FIGS. 7 and 8, a pair of kneading rotors 53, each having a plurality of blades 55, 55, are mounted in a kneading tank 51, and the kneaded material is pressed by a pressing mechanism. A tangential rotor-type closed pressure kneader that kneads the mixture by rotating the pair of kneading rotors 53 while applying pressure has been widely used.

[0003] The kneading tank 51 of the above-mentioned conventional closed pressure kneader.
Is a kneading vessel container portion 51A having a pair of kneading rotors 53, 53 having a peripheral surface formed by a pair of circular arcs continuously formed along the rotational outer peripheral surface of each blade 55, 55.
And a pair of end walls 51B located at both ends in the axial direction of the kneading rotors 53, 53. The kneading rotor 53 has an axial edge of a blade 55 and an end wall 51B of the kneading tank 51. A slight gap d is formed between the inner wall surface of the kneader and the inner wall of the kneading rotor 53 to ensure the lubricating rotation of the kneading rotor 53. Therefore, the kneading material enters the gap d at the time of kneading, and after the kneading material is removed, the rat is removed. There is a problem that the twisted residue of the kneading material called the tail stays and the removal and cleaning thereof is very troublesome.

Further, around a support shaft 53A of a kneading rotor 53 penetrating through an end wall 51B of the kneading tank 51,
A dust seal ring 65 for preventing leakage of the kneading material, especially the powder material, is tightly fitted into the through hole 63 of the end wall 51B, and the end face of the dust sealing ring 63 is pressed by a pressing mechanism 67 such as a spring. Although the sealing surface 53 a is pressed against the sealing surface 53 a at the end of the nozzle 53, the sealing surface 53 a substantially coincides with the inner surface of the end wall 51 B of the kneading tank 51. That is, in the closed press kneader equipped with the above pressurizing mechanism, the air extruded from the inside to the surroundings with the pressurization of the kneading material is discharged to the outside from the four circumferences of the press cover on the kneading tank 51. Further, the pressing force applied to the kneading material by the pressurizing mechanism acts on each inner end side sealing surface of the dust seal ring 65 on the inner wall surface of the end wall 51B of the kneading tank 51 due to kneading accompanying rotation of the kneading rotor 53. However, since these sealing surfaces are located on the inner surfaces of the end walls, which are the air flow surfaces in the kneading tank 51, when the kneading material is kneaded, the kneading material is moved by the action of the pressing force. There is a case where it may bite into the sealing surface or leak from the sealing surface. In particular, in the closed pressure kneader, in order for the blades 55 of the kneading rotor 53 to uniformly mix the kneading materials, the kneading material being kneaded in the kneading tank 51 is laterally moved in the axial direction of the kneading rotor 53, When the pressure of the lateral movement of the kneading material acts on the sealing surface, biting or leakage of the kneading material has occurred. In order to prevent this, a flange 53b shown in FIG. 8 is formed at both ends of the rotor 53 so that the re-mixing pressure of the kneading material does not act on the wall surface. As a result, a narrow gap is formed with a large area, and the removal of the residue that has penetrated the gap has become one of the factors that make it difficult to clean the kneading tank.

[0005]

SUMMARY OF THE INVENTION The technical problem of the present invention is to eliminate a narrow and large area gap in which the residue of the kneading material stays, and to prevent the kneading material from digging into and leaking from the sealing surface. It is an object of the present invention to provide a closed pressure kneader capable of minimizing the accumulation of the residue in the kneading tank by preventing the mixture and easily removing and cleaning the residue.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, a closed pressure kneader of the present invention comprises a kneading tank and a pressurizing mechanism for pressurizing a kneading material put in the kneading tank. Closed pressure kneading in which a pair of kneading rotors provided with a plurality of blades are pivotally supported on the end wall side of the kneading tank, and the kneading material is kneaded by rotation of the kneading rotor while the kneading material is pressed by the pressing mechanism. In the machine, at both ends in the axial direction of the kneading rotor, the edge of the blade adjacent to the end wall of the kneading tank was formed linearly at the inclination angle of the blade by cutting off the opposite rotating surface side at an acute angle. It is characterized by the following.

The kneading tank is composed of a pair of kneading rotors, each having a peripheral surface formed by connecting a pair of circular arcs along the rotating outer peripheral surface of each blade, and both ends in the axial direction of the kneading rotor. A side wall is formed by joining a pair of end walls located on the side, and the inner wall surface of the pair of end walls of the kneading tank in which the edges of the blades of the kneading rotor are close to each other is formed as a concave wall surface. It is appropriate that the concave wall surface and the inner wall surface of the kneading vessel are smoothly connected to each other. In this case, both ends of the kneading rotor in the axial direction are reduced in diameter through sealing surfaces orthogonal to the axial direction. The support shaft that protrudes, the outer periphery of the support shaft,
A dust seal ring is closely fitted in a through hole of a pair of end walls of the kneading tank through which the support shaft penetrates, and the dust seal ring is projected into the kneading tank from a concave wall surface in the end wall of the kneading tank, It is preferable to press the kneading rotor against the sealing surface.

[0008] In the closed pressurized kneader having the above structure, the edge of the blade adjacent to the end wall of the kneading tank is cut off at the opposite end face of the kneading tank at the both ends in the axial direction of the kneading rotor to form an acute angle. And the edges of the blades are configured to be close to the end wall of the kneading tank by a line, so that the kneading tank end wall and the blade are not affected without affecting the kneading action of the blade. A narrow gap where the kneading material stays between the edge and the edge can be eliminated, so that the occurrence of rat tail can be suppressed, and the residue staying in the kneading tank can be eliminated as much as possible. Removal and cleaning of the residue of the material can be easily performed.

In addition, the inner wall surfaces of the pair of end walls of the kneading tank are concavely formed to form a concave wall surface. Since the position of the sealing surface between the kneading vessel and the kneading vessel is separated from the corner of the kneading vessel and separated from the main airflow portion of the corner in the kneading vessel, the sealing face is directly in contact with the sealing face. The pressing force of the pressurizing mechanism does not act on the kneading material, so that the kneading material can be prevented from biting and leaking. In this case, after projecting a dust seal ring tightly fitted into the through-hole of the support shaft of the kneading rotor at the end wall of the kneading tank from the concave wall surface into the kneading tank, the sealing surface of the kneading rotor is By pressing, the rotary sealing surface of the dust seal ring can also be separated from the air flow surface of the kneading tank, whereby the pressing force does not directly act on the rotary sealing surface, Biting and leakage can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A closed pressure kneader according to the present invention will be described below in detail with reference to the drawings.
1 shows an example of an embodiment of a closed press kneader according to the present invention. As can be seen from FIGS. 1 and 2, the closed pressure kneader of this embodiment has a land surface at the tip end of a blade 5 constituting a rotating outer peripheral surface of a pair of kneading rotors 3 supported in a kneading tank 1. 5a and the inner wall surface of the kneading tank 1 constitute a tangential rotor-type closed pressure kneader having a structure in which kneading is performed by "rubbing".

[0011] The kneader generally comprises a kneading tank 1 and
A pressurizing mechanism 21 for pressurizing the kneading material charged into the kneading tank 1, and in the kneading tank 1, a pair of kneading rotors 3, 3 provided with a plurality of blades 5, 5 The kneading tank is supported by bearings (not shown) disposed outside the end wall, and the shafts of the rotors are connected to a drive source that is driven to rotate in the directions indicated by arrows in FIGS. 1 and 3. Above 1, a frame 9 for supporting the pressure mechanism 21 is provided upright.

An opening 11 for introducing a kneading material is formed in a side surface of a lower end portion of the frame 9, and inside the frame 9, a pressurizing member driven by a piston rod 22 a of a pneumatic cylinder device 22 is provided. A pressure lid 23 of the pressure mechanism 21 is vertically movably disposed. After the pressure lid 23 is raised, the kneading material is charged into the kneading tank 1 from the opening 11 with the pressure lid 23 raised. The kneading material is kneaded by rotating the kneading rotors 3 while lowering the kneading material with the pressure lid 23.

As shown in FIGS. 1 and 2, the kneading tank 1 is formed by a pair of kneading rotors 3, 3 having a pair of circular arcs extending along the outer peripheral surfaces of the blades 5, 5 in rotation. The kneading rotor 1 is configured by joining a kneading vessel portion 1A having a peripheral surface and a pair of end walls 1B located at both ends in the axial direction of the kneading rotors 3, 3. As can be seen from the developed view of FIG. 3, a pair of blades 5 and 5, which form a spiral shape in the anti-rotation direction from both ends of the kneading rotors 3, 3 toward the center, are attached to the blade base ends at both ends of the kneading rotor by 180 °. The end edges 5b of the blades 5 close to the end wall 1B of the kneading tank 1 are formed into an acute angle by cutting off the anti-rotation surface side. . As shown in FIGS. 4 to 6, the inner wall surfaces of the pair of end walls 1B of the kneading tank 1 are recessed to form a concave wall surface 1b, and the edge 5b of the blade 5 of the kneading rotor 3 is This concave wall 1
It is set to be close to b by a line. Above concave wall 1
b is, as can be seen from FIGS.
It is formed so as to be smoothly connected to the inner wall surface.

Further, a support shaft 3A whose diameter is reduced is continuously connected to both ends in the axial direction of the kneading rotor 3 via a sealing surface 3a orthogonal to the axial direction, and the support shaft 3A penetrates the outer periphery of the support shaft 3A. A dust seal ring 15 is closely fitted to the through hole 13 of the end wall 1B of the kneading tank 1 in a circumscribed manner.
The tip of the dust seal ring 15 is projected from the concave wall surface 1b of the end wall 1B of the kneading tank 1 into the kneading tank 1 and pressed against the sealing surfaces 3a formed at both ends in the axial direction of the kneading rotor 3. I have. The amount of protrusion of the tip of the dust seal ring 15 is set so that the sealing surface 3a is located at a position deviating from the flow of air in the kneading tank 1 along the concave wall surface 1b, and generally about 3 to 10 mm is appropriate. It is. The inner peripheral edge 5c of the blade 5 that contacts the outer peripheral portion of the tip of the dust seal ring 15 is formed in a scraper shape.

In the closed pressurized kneader having the above-described structure, at least both ends of the kneading rotor 3 in the axial direction are cut off at least on the anti-rotation surface side of the edge 5b of the blade 5 close to the end wall 1B of the kneading tank 1. To form an acute angle,
The edges 5b of the blades 5 correspond to the end walls 1 of the kneading tank 1.
Since it is configured to be close to B by a line, it is possible to eliminate a narrow gap in which the kneading material stays between the end wall 1B of the kneading tank 1 and the edge 5b of the blade 5; The generation of the residue of the kneading material such as rat tail can be suppressed, the residue staying in the kneading tank 1 can be eliminated as much as possible, and the kneading material residue can be easily removed and cleaned. In particular, when the edge 5b of the blade 5 is formed into an acute angle by cutting only the side opposite to the rotation surface, the residue on the end wall 1B of the kneading tank 1 can be more effectively removed without affecting the kneading action of the blade 5. can do.

The inner wall surfaces of the pair of end walls 1B of the kneading tank 1 are concavely formed to form a concave wall surface 1b, so that the position of the sealing surface between the both end walls and the kneading tank container 1A is formed. Are separated from the corners of the kneading tank 1 and away from the main air flow at the corners of the kneading tank 1, so that the pressing force of the pressurizing mechanism 21 acts directly on the sealing surfaces thereof. Therefore, it is possible to prevent the kneading material from biting and leaking. In this case, the support shaft 3A of the kneading rotor 3 in the end wall 1B of the kneading tank 1
Seal ring 15 tightly fitted in through hole 13
Is projected from the concave wall surface 1b into the kneading tank 1 and pressed against the sealing surface 3a of the kneading rotor 3 to thereby rotate the rotary sealing surface 15 of the dust seal ring 15.
a can also be separated from the air flow surface of the kneading tank 1 so that the pressing force does not directly act on the rotary sealing surface 15a, thereby preventing the kneading material from digging and leaking. Can be.

In the above-described embodiment, a tangential rotor type hermetic seal having a structure in which the land surface 5a of the blade 5 constituting the rotating outer peripheral surface of the kneading rotor 3 and the inner wall surface of the kneading tank 1 are kneaded by "rubbing". Although the pressure kneader was described,
The present invention is not limited to this.Rotation is performed so that the concave portion and the convex portion formed on the kneading rotor mesh with each other, and the concave portion and the convex portion are rotated so as to mesh with each other. An intermeshing rotor-type closed pressure kneader with a structure of kneading by "rubbing" with the difference in circumferential length, and others,
The present invention can be widely applied to those having a structure in which a kneading material is kneaded by rotation of a kneading rotor in a kneading tank.

[0018]

As described above in detail, according to the closed pressurized kneader of the present invention, it is possible to eliminate the narrow gap where the residue of the kneaded material stays, and to prevent the kneaded material from biting into the sealing surface. By preventing leakage from the sealing surface, stagnation of the residue in the kneading tank can be reduced as much as possible, and the residue can be easily removed and cleaned.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of the overall configuration of a closed pressure kneader according to the present invention.

FIG. 2 is a partially enlarged sectional view showing the inside of the kneading tank.

FIG. 3 is a development view showing a mounting state of a blade in a pair of kneading rotors.

FIG. 4 is a partially enlarged cross-sectional view schematically showing the main part.

FIG. 5 is a view taken in the direction of arrows AA in FIG. 4;

FIG. 6 is a detailed view of FIG. 5;

FIG. 7 is a partially enlarged sectional view showing the inside of a kneading tank in a conventional closed pressure kneader.

FIG. 8 is a partially enlarged cross-sectional view showing the configuration of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kneading tank 1B End wall 1b Concave wall 3 Kneading rotor 3A Support shaft 3a Sealing surface 5 Blade 5b Edge 13 Through hole 15 Dust seal ring 21 Pressurizing mechanism

Claims (3)

(57) [Claims] 1. A kneading tank and a pressurizing mechanism for pressurizing a kneading material charged into the kneading tank, wherein a pair of kneading rotors each having a plurality of blades are arranged on an end wall side of the kneading tank. In a closed pressure kneader that supports and kneads the kneading material by rotating the kneading rotor while pressurizing the kneading material with the pressing mechanism, at both ends in the axial direction of the kneading rotor, close to the end wall of the kneading tank. A closed press kneader, wherein an edge of the blade is cut linearly at an angle of inclination of the blade by cutting off the opposite rotation surface side at an acute angle. 2. The closed press kneader according to claim 1, wherein the kneading tank is provided with a pair of kneading rotors each having a pair of circular arcs formed along a rotating outer peripheral surface of each blade. The kneading tank has a kneading vessel, and a pair of end walls located at both ends in the axial direction of the kneading rotor, and is constituted by joining a pair of end walls of the kneading tank, the edge of the blade of the kneading rotor is A closed pressure kneader, wherein a concave wall surface is formed by recessing an adjacent inner wall surface, and the concave wall surface is smoothly connected to the inner wall surface of the kneading vessel. 3. The closed press kneader according to claim 2, wherein a support shaft having a reduced diameter is protruded from both ends in the axial direction of the kneading rotor via a sealing surface orthogonal to the axial direction. At the outer periphery of the shaft, a dust seal ring is tightly fitted into a through hole of the end wall of the kneading tank through which the support shaft passes, and the dust seal ring is inserted into the kneading tank from a concave wall surface of the end wall of the kneading tank. A hermetically closed pressure kneader, which protrudes and presses against the sealing surface of the kneading rotor.