JP2006116400A - Air tightly closed pressurization kneader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a reduction in power consumption by reducing resistance force acting on a blade at kneading in an air tightly closed pressurization kneader. <P>SOLUTION: Two blades 8a, 8b extending in a helical direction making one end and the other end in an axial direction of two rotors 6a, 6b as starting ends 18 and having a terminal end 19 occupying an intermediate position of the rotors 6a, 6b are provided on outer peripheries of the two rotors 6a, 6b rotatably arranged in a kneading tank 2 in parallel to each other, respectively. These blades 8a, 8b are each curved to a moderate projection shape toward a front side in a rotation direction of the rotors and a land 20 is formed on apex parts of the blades 8a, 8b such that width becomes narrower from the starting end 18 side toward the terminal end 19 side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic pressure kneader for kneading a kneading material such as rubber, plastic, ceramic, etc., in a hermetically sealed kneading tank by two rotors having a plurality of blades on the outer periphery.

  As this type of hermetic pressure kneader, there has been known one as described in Patent Document 1. In this kneading machine, two rotors having two blades facing in the spiral direction are arranged horizontally and in parallel inside the kneading tank, and the kneading material is accommodated in the kneading tank. The kneaded material is kneaded with these blades by rotating the rotors in opposite directions, that is, in a direction in which the kneaded material is wound while the blades are engaged with each other, and is called a tangential rotor type.

The blades are formed in a straight line along the spiral on the outer periphery of the rotor, and the kneaded material is alternately pushed in the axial direction of the rotor by these blades, and at the same time, It is kneaded while being stretched between the inner peripheral wall of the tank and kneaded by their cooperative action.
JP-A-9-313916

  However, in this kind of kneader, generally, when kneading a highly viscous material such as rubber as a kneading material, a large resistance acts on the blade, so that a great amount of electric power is consumed. There was a problem.

  Accordingly, an object of the present invention is to increase the kneading speed and shorten the kneading time and reduce the power consumption by reducing the resistance acting on the blade during kneading in the kneader. .

  In order to achieve the above object, the closed pressure kneader of the present invention has an inner peripheral surface shape in which two substantially C-shaped partial circumferential surfaces are connected to face each other, and the insides are adjacent to each other. In addition, it is divided into two rotor chambers that communicate with each other, and has a crest portion that rises in a mountain shape at the boundary between the two rotor chambers at the inner bottom, and both end portions in the axial direction are respectively closed by tank end walls. A kneading tank that is rotatably disposed in each of the rotor chambers, two parallel rotors having a plurality of blades on the outer periphery, and a tank that penetrates the tank end wall from both ends of each rotor. The blade has a small-diameter drive shaft extending outward, and the blade extends in a spiral direction with one end or the other end in the axial direction of the rotor as a starting portion, and the terminal portion occupies an intermediate position of the rotor. And these blades from the bottom side to the top And has a land that faces the inner peripheral surface of the rotor chamber at the top, and has a convex shape that is smooth toward the front side in the rotational direction of the rotor. It is characterized by being curved.

  In the present invention, the ridge wall portion has a ridge line extending in the axial direction of the kneading tank at the top center position thereof, shoulder surfaces formed so as to be inclined obliquely downward on both sides of the ridge line, and these shoulder surfaces And a corner formed at a position where the inner circumferential surface of each rotor chamber is continuous, and the distance between the land and the corner during rotation of the rotor is between the land and the inner circumferential surface of the rotor chamber. It is narrower than the interval.

  In the present invention, the width of the land is gradually narrowed from the leading end side to the terminal end side of the blade.

  Preferably, in the present invention, at the leading end portion of each of the blades, the rear portion of the rear portion located on the rear side in the rotor rotation direction of the leading end portion is inclined with respect to the tank end wall. A gap that gradually widens toward the rear side in the rotational direction of the rotor is formed between the front end portion and the tank end wall, and the end surface of the front portion located on the front side in the rotor rotational direction is formed in parallel with the tank end wall. Thus, the front side portion is arranged in a state close to the tank end wall.

According to the present invention, each blade on the outer periphery of the rotor is curved in a smooth convex shape toward the front side in the rotational direction of the rotor, so that the kneaded material is rotated from the end side of the kneading tank by the rotation of the blade. It flows smoothly and quickly to a position near the center, is sufficiently stirred, and its dispersion is promoted. At that time, the resistance force applied to each blade or rotor is small, and therefore, it is highly viscous like rubber. Even kneaded materials can be kneaded efficiently and quickly with low power consumption.
In this case, as in the second aspect of the invention, the distance between the corner and the land of the blade is the distance between the land and the inner peripheral surface of the tank at the position of the corner of the side surface of the wall. When the kneaded material is kneaded into the space between the land and the inner peripheral surface of the tank, the two rotors pull the kneaded material at the corners. Since the kneaded material is cut without any problems, the resistance when the kneaded material is kneaded within the above-mentioned interval is further reduced, and the resistance acting on the blade is further reduced, so that further power saving can be realized. It becomes.

  Hereinafter, preferred embodiments of the closed pressure kneader according to the present invention will be described. FIG. 1 shows a main part of a kneading machine in a cross section of a kneading tank 2 located at the lower end of the machine body 1. The kneading tank 2 has an inner peripheral surface shape in which two substantially C-shaped partial circumferential surfaces are connected to face each other, and the two rotor chambers 3a and 3b that are adjacent to each other and communicate with each other. In addition, a crest wall portion 4 rising in a mountain shape is formed at the boundary between the inner peripheral surfaces 3c of the rotor chambers 3a and 3b at the bottom of the tank, and both axial ends of the kneading tank 2 are Each is closed by a tank end wall 5 (see FIG. 2).

  As apparent from FIG. 2, the rotor chambers 3a and 3b have first and second rotors 6a and 6b each having a plurality of blades 8a and 8b extending in the spiral direction on the outer periphery. It is arranged so as to be rotatable around a parallel and horizontal central axis L. Then, the drive shafts 9, 9 having a smaller diameter than the rotors 6a, 6b are connected to the second end 7b opposite to the first end 7a, which is one end side in the axial direction of each rotor 6a, 6b. A drive shaft 9 extends through the tank end walls 5 and 5 to the outside of the tank, is rotatably supported by a bearing mechanism (not shown), and is connected to a drive source via a power transmission mechanism such as a gear. The two rotors 6a and 6b are configured to be driven and rotated at a constant speed while being synchronized in opposite directions as indicated by arrows in FIGS. 1 and 2 by the drive source and the power transmission mechanism. . The first end 7a and the second end 7b of the rotors 6a and 6b are formed in a flange shape having a slightly larger diameter than the intermediate portion of the rotors 6a and 6b, but they may have the same diameter.

The upper end portion of the kneading tank 2 is formed by a lid 12 that can be freely opened and closed, and this lid 12 is connected to the lower end of a rod 14 of a fluid pressure cylinder 13 installed at the upper part of the machine body 1. It opens and closes by the vertical movement of the rod 14. Then, with the lid 12 opened, the kneaded material is introduced into the kneading tank 2 from the inlet 16 on the side surface of the machine body 1, and then the lid 12 is closed and the kneaded material is removed with the lid 12. While pressing, the two rotors 6a and 6b are rotated in the direction indicated by the arrows in FIGS. 1 and 2, that is, the blades 8a and 8b are engaged with each other to rotate the kneaded material. The kneaded material is kneaded by 8b.
Therefore, the fluid pressure cylinder 13 serves as an opening / closing mechanism for opening / closing the lid 12 and a pressurizing mechanism for pressurizing the kneaded material via the lid 12.

  Each of the rotors 6a and 6b is provided with two blades 8a and 8b, respectively, as representatively shown by one rotor 6a in FIGS. The blades 8a and 8b have respective starting end portions 18 at positions where the phases in the circumferential direction are 180 ° different from each other on the first end 7a side and the second end 7b side of the rotor 6a. The outer peripheral surface of the rotor 6a is extended in the spiral direction, and the terminal portion 19 occupies a substantially intermediate position of the rotor 6a. These blades 8a and 8b have a mountain-shaped cross-sectional shape that becomes gradually narrower from the bottom side toward the top side, and form a curved surface corresponding to the inner peripheral surface 3c of the rotor chamber 3 at the top. A land 20 is provided, and the land 20 rotates in a state where a constant distance Sa (see FIG. 8) is maintained between the land 20 and the inner peripheral surface 3c. The other rotor 6b has the same configuration.

  The lengths of the two blades 8a and 8b in the spiral direction are not the same as each other, but are slightly different. Among these, the long first blade 8a occupies a position where the end portion 19 slightly passes the intermediate point in the axial direction of the rotor 6a, and the short second blade 8b has the end portion 19 of the rotor 6a. Almost occupies the middle point. The helical angle θ of these blades 8a and 8b, that is, the twist angle θ around the central axis of the rotor 6a from the starting end portion 18 to the terminal end portion 19 is about 80 to 90 °.

  The two rotors 6a and 6b are formed so that the blades 8a and 8b occupy opposite positional relationships. That is, in the first rotor 6a, the long first blade 8a has the first end 7a side of the rotor 6a as the starting end 18, and the short second blade 8b has the second end 7b side as the starting end. In the other second rotor 6b, the long first blade 8a has the second end 7b side of the rotor 6b as the starting end 18, and the short second blade 8b is the second rotor 6b. The first end 7a side is formed as a starting end portion 18 respectively. The two rotors 6a and 6b are related so that the blades 8a and 8b rotate synchronously while meshing with each other at a phase different by 90 °.

Each of the blades 8a and 8b does not extend straight along the spiral while maintaining a constant cross-sectional shape. As can be seen from the developed view of FIG. 6, the rotation of the rotors 6a and 6b over the entire length thereof. It curves in a smooth convex shape toward the front side. Further, the width of the land 20 is gradually narrowed from the starting end 18 side to the terminal end 19 side of each blade 8a, 8b. However, the width and height of the bottom side of the blades 8a and 8b are substantially constant over the entire length of the blade. Therefore, the inclination of each blade 8a, 8b with respect to the axis L of the rotor 6a, 6b is not constant over the entire blade, and the degree of inclination is the smallest on the starting end 18 side, and gradually toward the terminal end 19 side. It will increase. Moreover, since the width of the land 20 is gradually narrowed from the leading end 18 side of the blades 8a, 8b toward the terminal end 19 side, the degree of inclination of the side surfaces of the blades 8a, 8b is also the end portion 19 side. It is getting bigger gradually.
The land width Ha on the leading end 18 side and the land width Hb on the terminal end 19 side of the blades 8a and 8b, when Hb is 1, Ha may be about 1.5 to 3. desirable.

  Further, as representatively shown by one rotor in FIG. 7, at the starting end 18 of each of the blades 8 a and 8 b, the end surface of the rear portion 18 a located on the rear side in the rotor rotation direction of the starting end 18. Is an inclined surface 18c that is inclined with respect to the tank end wall 5, so that a gap gradually expands between the rear portion 18a and the tank end wall 5 toward the rear side in the rotational direction of the rotors 6a and 6b. 23, and the end surface of the front portion 18b located on the front side of the starting portion 18 in the rotor rotation direction is formed in parallel with the tank end wall 5, and the front portion 18b is formed in the tank end wall. With respect to 5, a slight gap Wb corresponding to the thrust movement amount of the rotor is retained and is arranged in close proximity. In this case, the relationship between the maximum width Wa of the gap 23 and the front-rear width Wc of the gap Wb and the front portion 18b is, for example, when Wa is 5 mm, Wb is about 1.5 mm and Wc is about 2 to 3 mm. It is desirable to be.

  By forming the gap 23 having the shape and direction as described above on the side of the starting end 18 of each blade 8a, 8b, the kneaded material is placed between the starting end 18 of the blade 8a, 8b and the tank end wall 5. There is an advantage that it is difficult to stay as a residue. Even if the kneaded material remains as a residue in the gap 23, the gap 23 is gradually widened toward the rear side in the rotational direction of the rotors 6a and 6b, so that removal and cleaning can be easily performed. As a result, it is possible to reliably prevent foreign materials from being mixed into the next kneading step.

  The tank end walls 5 at both ends of the kneading tank 2 are provided with annular seal members 24 surrounding the drive shaft in a non-contact state at the inner peripheral portion of the hole through which the drive shaft 9 passes. 5 is attached in a dense state. These seal members 24 are formed so that the outer peripheral surfaces thereof coincide with the outer peripheral surfaces of the first end 7a and the second end 7b of the rotors 6a, 6b, and the end surfaces in the axial direction thereof are the first ends. 7a and the second end 7b are slidably pressed against the seal surface 25 formed on the end surfaces. By providing the sealing member 24 in such a manner, it is possible to completely prevent the gap between the rotors 6a and 6b and the tank end wall 5 from leaking out of the kneading material to the outside of the kneading tank. it can.

  Further, as shown in FIG. 8, the crest wall portion 4 formed on the inner bottom portion of the kneading tank 2 has a ridge line 28 extending in the axial direction of the kneading tank 2 at the center of the top portion and both sides of the ridge line 28. Shoulder surfaces 29, 29 each having a flat surface formed so as to be inclined obliquely downward, and a corner portion 30 formed at a position where these shoulder surfaces 29, 29 and the inner peripheral surface 3c of each rotor chamber 3a, 3b are connected. , 30. And the space | interval Sb formed between the land 20 and each corner | angular part 30 at the time of rotation of the said rotor 6a, 6b is the space | interval formed between the land 20 and the internal peripheral surface 3c of each rotor chamber 3a, 3b. It is set narrower than Sa. The relationship between the distances Sa and Sb varies depending on the capacity of the kneader, the kneading material, and the like, but it is generally desirable that Sb = Sa / 2.

  As shown in the figure, the corner portion 30 is formed into a curved surface having a smaller radius of curvature than the inner peripheral surface 3c of the rotor chambers 3a and 3b. There is a method in which the cap-shaped member 33 made of a hard metal having the ridge line 28 and the shoulder surface 29 is fixed to the upper end portion of the wall portion 4 by fixing means such as welding. In this case, the side surface 34 of the cap-shaped member 33 may be processed in advance into the curved surface described above, or may be processed in such a manner after being attached to the wall 4. Alternatively, the entire wall portion 4 having the ridgeline 28, the shoulder surface 29, and the corner portion 30 may be formed as a separate member, and fitted to the boundary portion between the rotor chambers 3a and 3b and welded.

  The kneading machine having the above configuration accommodates a kneading material such as rubber, plastic or ceramic in the kneading tank 2, and kneads the two rotors 6a and 6b by rotating them in the directions indicated by the arrows in FIGS. Is. The rotational speed of the rotor at this time varies depending on the scale of the kneader, the type of the kneading material, and the like, but is usually about 20 to 40 rpm, and about 60 rpm for the high speed mixer. The kneaded material is pressed by the outer peripheral blades 8a and 8b of the two rotors 6a and 6b, and is alternately pushed in the direction of the axis L of the rotors 6a and 6b, and the blades 8a of both the rotors 6a and 6b. , 8b are compressed or stretched by being pulled together, and are further kneaded into the distance Sa between the land 20 of each blade 8a, 8b and the tank inner peripheral surface 3c. By receiving, the kneading is promoted.

  In this case, since each of the blades 8a and 8b is curved in a smooth convex shape toward the front side in the rotational direction of the rotors 6a and 6b, the degree of inclination of the blades 8a and 8b with respect to the axis of the rotors 6a and 6b is , It is the smallest on the starting end 18 side and gradually increases toward the end end 19 side. Therefore, the kneaded material is moved to one end side of the rotor 6a, 6b, and is pressed by a certain blade 8a, 8b. In the initial stage where the kneading material starts, the kneaded material is pressed by the blade starting portion 18 having the smallest inclination. At this time, the kneaded material is easily moved toward the opposite side and is easily deformed. No great resistance acts on 8b.

  When the kneaded material is pressed by the blades 8a and 8b and moves toward the other end of the rotor 6a and 6b as the rotors 6a and 6b rotate, the resistance force of the kneaded material increases and a large pressing force in the axial direction is generated. Although necessary, the inclination of the blades 8a and 8b gradually increases, and a large pressing force can be exerted in the axial direction with the same rotational force. Therefore, the resistance force applied to the blades 8a and 8b, that is, the rotors 6a and 8b is increased. Although it increases slightly, it does not increase rapidly. In this case, the width of the land 20 is gradually narrowed from the starting end 18 side to the end end 19 side of each blade 8a, 8b. Therefore, the above-described effect is promoted together with this point.

  The above-described absorbing action of the resistance force due to the increase in the inclination of the blades 8a and 8b is also exhibited when the kneaded material is kneaded into the space between the land 20 of the blades 8a and 8b and the tank inner peripheral surface 3c. Is done. In this case, the kneaded material is kneaded between the land 20 and the tank inner peripheral surface 3 c through the corner portion 30 while being gradually squeezed by the shoulder surface 29 of the wall portion 4. Since the distance Sb between the land 20 and the land 20 is narrow at this position, the kneaded material is cut at this position and is pulled between the land 20 and the tank inner peripheral surface 3c by the two rollers 6a and 6b. It becomes easy to be pulled in without doing, and as a result, the resistance force at the time of kneading mentioned above will be further reduced.

  Thus, according to the kneader having the above-described configuration, since the resistance applied to each blade 8a, 8b, that is, the rotor 6a, 6b is small during kneading, even a highly viscous kneading material such as rubber can be consumed with low power consumption. It is possible to knead efficiently and quickly. From the experiment, it is predicted that the power saving rate reaches approximately 30 to 50% compared to the case of using a rotor in which a blade having a constant land width is attached in a spiral direction.

  In the above embodiment, each rotor has two blades, but the number of blades may be three or four.

It is principal part sectional drawing of the sealed press kneading machine which concerns on this invention. It is an expanded sectional view which shows the internal structure of a kneading tank. It is the elements on larger scale of FIG. 2 explaining the structure of a rotor. It is the side view which looked at the rotor in the axial direction. It is sectional drawing in the AA in FIG. It is the top view which developed the rotor. FIG. 4 is a partially enlarged view of FIG. 3. It is the elements on larger scale of FIG.

Explanation of symbols

2 Kneading tanks 3a, 3b Rotor chamber 3c Inner peripheral surface 4 Recessed wall 5 Tank end walls 6a, 6b Rotor 8a, 8b Blade 9 Drive shaft 18 Starting portion 18a Rear portion 18b Front portion 19 End portion 20 Land 23 Gap 28 Edge line 29 Shoulder surface 30 Corner part Sa, Sb Spacing Ha, Hb Land width Wa Maximum gap width

Claims (4)

It has an inner peripheral surface shape in which two substantially C-shaped partial circumferential surfaces are connected to face each other, and the interior is divided into two rotor chambers that are adjacent to each other and communicate with each other. A kneading tank having a ridged wall that rises in a chevron shape at the boundary of the rotor chamber and whose both ends in the axial direction are respectively closed by the tank end walls, and the rotor chamber are rotatably arranged. Two parallel rotors provided with a plurality of blades on the outer periphery, and a small-diameter drive shaft that extends from both ends of each rotor to the outside of the tank through the tank end wall,
The blade extends in a spiral direction with one end or the other end in the axial direction of the rotor as a starting portion, and a terminal portion occupies an intermediate position of the rotor, and these blades are directed from the bottom side to the top side. It has a mountain-shaped cross-sectional shape that becomes gradually narrower, has a land facing the inner peripheral surface of the rotor chamber at the top, and curves in a smooth convex shape toward the front side in the rotational direction of the rotor. is doing,
A closed pressure kneader characterized by the above.   The ridge wall portion has a ridge line extending in the axial direction of the kneading tank at the top center position, shoulder surfaces formed so as to be inclined obliquely downward on both sides of the ridge line, and the shoulder surfaces and the rotor chambers. A corner portion formed at a position where the inner peripheral surface is continuous, and the interval between the land and the corner portion when the rotor rotates is narrower than the interval between the land and the rotor inner circumferential surface. The hermetic pressure kneader according to claim 1, which is formed.   The hermetic pressure kneader according to claim 1 or 2, wherein a width of the land gradually becomes narrower from a leading end side to a terminal end side of the blade.   By inclining the end surface of the rear part located on the rear side in the rotor rotation direction of the blade at the starting part of each blade, the rear part and the tank end wall are inclined with respect to the tank end wall. A gap that gradually widens toward the rear side in the rotational direction of the rotor is formed between them, and the end surface of the front portion located on the front side in the rotor rotational direction is formed in parallel with the tank end wall, and this front portion is The hermetic pressure kneader according to any one of claims 1 to 3, wherein the hermetic pressure kneader is disposed in a state of being close to the tank end wall.

Images