TW201343247A - Rotor shaft for kneading and kneading machine - Google Patents

Abstract

A rotor for kneading and a kneading machine include a rotor shaft which is a tubular member and where a blade for kneading, which is formed of a solid structure and has no space, is provided; and a helical pipe inserted into the rotor shaft and formed such that a flow tube, in which a cooling medium flows so as to cool the rotor shaft, is spirally arranged; and the helical pipe is arranged so as to make contact with an inner periphery of the rotor shaft.

Description

Mixing rotor and mixer

The present invention relates to a kneading rotor for kneading a rubber material or the like, and a kneading machine including a kneading rotor, and more particularly to a cooling structure thereof.

The present application claims priority based on Japanese Patent Application No. 2012-018484, filed on Jan.

Conventionally, a kneading machine for rubber production such as a closed mixer is kneaded by applying a strong shearing force to a material such as rubber, and thus generates heat by kneading. When the heat causes the rubber temperature to be too high, the quality of the rubber deteriorates, so it is necessary to have sufficient cooling ability. When the cooling capacity is insufficient, the rubber must be discharged to the outside during the kneading to be cooled, and when the temperature is lowered, the kneading is performed again, which greatly affects the productivity.

Here, an example of a kneading machine having a so-called one-piece kneading rotor (in which the rotor shaft and the wing portion are integrally formed) is described in Patent Document 1.

The kneading machine of Patent Document 1 is a rotor for kneading equipped with a rotor shaft. The rotor shaft is housed in a mixing chamber having a rotor main body in which a cooling passage is formed and a spiral portion formed in a spiral shape in an axial direction of an outer circumference of the rotor main body.

Further, in the kneading machine, the inner tube housed in the cooling passage formed in the rotor main body is provided with a branch pipe for connecting the cooling passage and the hollow portion (sleeve) inside the wing portion, thereby being sent to The cooling medium of the cooling passage is surely introduced into the hollow portion inside the wing portion, and the cooling effect of the wing portion is improved.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 52-5395

However, in the kneading rotor of the kneading machine of Patent Document 1, the cooling medium sent to the cooling passage can be surely introduced into the hollow portion inside the wing portion, and the cooling effect of the wing portion can be improved, but the hollow portion of the wing portion can be improved. The cross-sectional area of the flow path of the cooling medium becomes large. Therefore, the flow rate is inevitably slowed down, and the heat transfer rate may be lowered to obtain a sufficient cooling effect.

Here, the rotor shaft and the wing portion are manufactured as individual parts, and after the flow path for the cooling medium is formed on the inner surface of the wing portion that is in contact with the rotor shaft, the rotor shaft and the wing portion are combined by fitting. A rotor for kneading of a construction is also generally known. By using such a kneading rotor, it is possible to improve the cooling capacity. However, in this case, many related to the fitting step Homework becomes necessary. Therefore, a kneader having such a kneading rotor is still disadvantageous in terms of cost.

The present invention has been developed in consideration of the above circumstances, and an object thereof is to provide a kneading rotor and a kneading machine, which can suppress cost and improve cooling efficiency.

According to a first aspect of the present invention, a kneading rotor includes a rotor shaft and a spiral tube; the rotor shaft is a tubular member, and a wing portion for kneading is provided on an outer peripheral surface; the spiral tube is inserted into the rotor shaft Internally, the flow tube is formed in a spiral shape, and the flow tube allows the cooling medium to flow therein to cool the rotor shaft.

According to the configuration of the above aspect, as the flow path of the cooling medium, instead of providing a complicated inner tube inside the rotor shaft, the flow tube of the spiral tube is inserted. Therefore, the processing at the time of setting becomes unnecessary, and the cost can be suppressed. Further, when the cooling medium is simply circulated toward the axial direction of the rotor shaft, the cooling medium is circulated toward the spiral tube, so that the cross-sectional area of the flow path can be reduced and the flow velocity of the cooling medium can be increased, so that heat transfer can be performed. Rate increase.

Further, according to a second aspect of the present invention, in the kneading rotor according to the first aspect of the present invention, the spiral tube is disposed in contact with an inner circumferential surface of the rotor shaft.

According to the configuration of the above aspect, by making the spiral tube surely The heat from the wing portion and the rotor shaft can be efficiently recovered by coming into contact with the inner peripheral surface of the rotor shaft.

Further, according to a third aspect of the present invention, in the first embodiment or the second aspect of the present invention, in the rotor for kneading, a filling is filled between the spiral tube and the inner peripheral surface of the rotor shaft. material.

According to the configuration of the above aspect, the gap between the spiral tube and the inner circumferential surface of the rotor shaft can be filled with the filler, and the contact resistance can be lowered to further improve the cooling ability.

Further, according to a fourth aspect of the present invention, in the kneading rotor according to any aspect of the first aspect to the third aspect of the present invention, the spiral tube is disposed toward an inner circumference of the rotor shaft. The elastic member of the surface is pressed.

According to the above-described configuration, the elastic member is biased toward the inner circumferential surface of the rotor shaft by the elastic member, so that the gap between the spiral tube and the inner circumferential surface of the rotor shaft can be reduced, and the contact heat resistance can be lowered to improve the cooling capacity. .

According to a fifth aspect of the present invention, in the kneading rotor according to the fourth aspect of the present invention, the elastic member is an elastic member that accumulates an elastic repulsive force toward the outer circumference.

According to the structure of the above aspect, the elastic tube is biased toward the inner circumferential surface of the rotor shaft by the elastic member, so that the gap between the flow tube of the spiral tube and the inner circumferential surface of the rotor shaft can be reduced, and the contact thermal resistance can be lowered. Increased cooling capacity.

Further, according to a sixth aspect of the present invention, in the fourth aspect of the present invention, in the rotor for kneading, the elastic member is oriented toward the outer periphery. A foaming member having an anti-repulsion force.

According to the configuration of the above aspect, the spiral tube is biased toward the inner circumferential surface of the rotor shaft by the foaming member, so that the gap between the flow tube of the spiral tube and the inner circumferential surface of the rotor shaft can be reduced, and the contact thermal resistance can be reduced. Increase cooling capacity.

According to a seventh aspect of the present invention, in the kneading rotor according to any one of the first aspect to the sixth aspect of the present invention, the flow pipe of the spiral pipe has a rectangular cross section.

According to the structure of the above aspect, the flow tube of the spiral tube can be in surface contact with the inner circumferential surface of the rotor shaft, and the contact thermal resistance between the flow tube of the spiral tube and the inner circumferential surface of the rotor shaft can be reduced to improve the cooling capacity. .

According to the eighth aspect of the present invention, the kneading machine is provided with the kneading rotor of any one of the first aspect to the seventh aspect of the present invention.

According to the configuration of the above aspect, the cost can be suppressed by using the spiral tube, and the flow path sectional area of the cooling medium can be reduced to increase the flow velocity of the cooling medium. Therefore, the heat transfer rate can be improved, and the cooling efficiency can be improved.

According to the above-described mixing rotor and the kneading machine, by making the flow tube of the cooling medium a spiral tube, it is possible to suppress the cost and improve the cooling efficiency.

10,40,60,80,100‧‧‧mixer

20,21,50,70,90,110‧‧‧Roasting rotor

22, 23‧‧‧ wing

27‧‧‧Rotor shaft

28,112‧‧‧Flow pipe

29,111‧‧‧Spiral tube

51‧‧‧Filling materials

71‧‧‧Elastic members (elastic members)

91‧‧‧Foaming members (elastic members)

Fig. 1 is a longitudinal sectional view showing a kneading machine equipped with a kneading rotor according to a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing a kneading rotor according to a first embodiment of the present invention.

Fig. 3 is a longitudinal sectional view of a main part of a kneading rotor according to a second embodiment of the present invention.

Fig. 4 is a cross-sectional view showing the main part of a kneading rotor according to a third embodiment of the present invention.

Fig. 5 is a cross-sectional view showing the main part of a kneading rotor according to a fourth embodiment of the present invention.

Fig. 6 is a longitudinal sectional view of a main part of a kneading rotor according to a fifth embodiment of the present invention.

Hereinafter, the kneading rotor and the kneading machine according to the plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

As shown in Fig. 1, the kneading machine 10 including the kneading rotors 20 and 21 according to the first embodiment of the present invention has a kneading chamber 12 formed inside the casing 11.

In the kneading machine 10 of the present embodiment, a pair of kneading rotors 20 and 21 are arranged in parallel in the kneading chamber 12 to form a so-called closed kneader.

The pair of kneading rotors 20 and 21 are rotated in opposite directions by a drive source such as a motor (not shown), and are formed outwardly on the outer surfaces of the kneading rotors 20 and 21, respectively. Wings 22, 23.

The wings 22, 23 are, for example, twisted in a spiral shape with respect to the axes 24, 25 of the kneading rotors 20, 21. The wing portions 22, 23 are arranged to be meshed with each other by the rotation of the kneading rotors 20, 21.

In the upper portion of the kneading machine 10, a hopper 13 that communicates with the kneading chamber 12 to allow a kneading material such as a rubber material to be fed, and a kneading material that is put into the hopper 13 to be pressed into the kneading chamber 12 are provided. Hammer 14.

Further, at the bottom of the kneading machine 10, a hanging door 15 for taking out the kneaded material to the outside is opened and closed.

The kneading machine 10 presses the kneaded material that has passed through the hopper 13 into the kneading chamber 12 by the floating ram 14.

Next, the kneading material is mixed by the meshing action of the kneading rotors 20, 21 rotating in opposite directions and the shearing action between the kneading rotors 20, 21 and the inner surface of the kneading chamber 12. Refining.

Further, the kneading machine 10 takes the kneaded material from the kneading chamber 12 to the outside by opening the hanging door 15 provided at the bottom of the kneading chamber 12, and transports it to another step.

Next, the detailed structure of the kneading rotors 20, 21 will be described.

The other pair of kneading rotors 20 and 21 have the same structure. Here, only one kneading rotor 20 will be described, and the other kneading rotor 21 will be omitted.

As shown in Fig. 2, the kneading rotor 20 includes a rotor shaft 27 that is provided with a wing portion 22 for kneading on the outer circumferential surface of the rotor main body 26 as a tubular member.

Further, the kneading rotor 20 includes a spiral tube 29 that is inserted into the rotor shaft 27 and is formed by spirally arranging the flow tube 28, and the flow tube 28 allows the cooling medium C to flow therein. The rotor shaft 27 is cooled.

One of the radial directions of the flow tube 28 and the other square have a circular cross-sectional shape.

Here, the kneading rotor 20 is formed by integrally forming the wing portion 22 and the rotor shaft 27 by casting or the like, and is formed in a so-called metal one-piece structure. The wing portion 22 is formed as a solid structure having no space inside.

Further, the kneading rotor 20 includes a spiral tube accommodating portion 32 having a closing portion 30 on one end side in the direction of the axis 24 of the rotor main body 26 and an opening portion 31 at the other end portion.

Further, in the kneading rotor 20, the spiral tube 29 is housed in the spiral tube housing portion 32 of the rotor main body 26.

The spiral tube 29 has a plurality of flow tubes 28 having a coil spring shape, and a central introduction tube 33 that communicates with the flow tube 28 on the side of the closing portion 30 is provided at a radially central portion of the axis 24, radially outward of the axis 24 A discharge pipe 34 that is connected to the flow pipe 28 on the side of the opening 31 is provided.

Further, the spiral tube 29 allows the cooling medium C introduced from the central introduction tube 33 to the flow tube 28 on the side of the closing portion 30 to flow through the plurality of flow tubes 28. After that, the flow pipe 28 from the opening portion 31 side is led out to the outside through the discharge pipe 34.

In the spiral tube 29, the outer diameter of the plurality of flow tubes 28 and the inner diameter of the spiral tube housing portion 32 are substantially the same size, and the plurality of flow tubes 28 are in contact with the inner circumferential surface of the spiral tube housing portion 32. insert.

Next, the action of the kneading rotor 20 will be described.

The kneading material is mixed by the meshing action of the kneading rotor 20 (21) rotating in the opposite direction and the shearing action between the kneading rotor 20 (21) and the inner surface of the kneading chamber 12 Refining.

At this time, the spiral tube 29 is rotated together with the kneading rotor 20, and the cooling medium C is introduced from the center introduction pipe 33 to the flow pipe 28 on the side of the closing portion 30, and the flow pipe 28 from the opening portion 31 side passes through the discharge pipe 34. Circulation.

Therefore, the heat generated by the wing portion 22 and the rotor shaft 27 can be recovered by the cooling medium C flowing through the flow tube 28 that is in contact with the spiral tube accommodating portion 32, and the wing portion 22 and the rotor shaft 27 can be cooled.

As described above, the flow path of the cooling medium C is not provided with an inner tube having a complicated flow path shape inside the rotor shaft 27, but the spiral tube 29 is inserted. Therefore, processing at the time of installation is unnecessary, and cost can be suppressed.

Further, when the cooling medium C is simply circulated in the direction of the axis 24 of the rotor shaft 27, the cooling medium C is caused to flow toward the spiral tube 29, and the flow path cross-sectional area can be reduced to increase the flow rate of the cooling medium. Increase. Therefore, the heat transfer rate can be improved.

As described above, according to the kneading rotor 20 of the first embodiment, the spiral tube 29 having the flow tube 28 is inserted, and the flow tube 28 is brought into contact with the inner circumferential surface of the spiral tube housing portion 32 of the rotor shaft 27. It can suppress the cost and increase the heat transfer rate, and improve the cooling efficiency.

(Second embodiment)

Next, the kneading rotor and the kneading machine according to the second embodiment of the present invention will be described.

In the following embodiments, constituent elements or functions that are the same as those in the above-described first embodiment are denoted by the same reference numerals or the same reference numerals, and the description thereof will be simplified or omitted.

As shown in FIG. 3, the kneading rotor 50 of the kneading machine 40 according to the second embodiment of the present invention is in the flow pipe 28 of the spiral pipe 29 and the spiral pipe accommodating portion 32 formed in the rotor main body 26. A filler 51 is filled between the circumferential surfaces. The filler 51 is, for example, a heat-dissipating gel sheet using ruthenium or the like as a raw material, a functional material containing carbon fibers or carbon nanotubes, and the like, and is preferably a highly flexible heat conductive material.

Further, the filler 51 has a tube contact surface 52 formed on the inner circumference, and the tube contact surface 52 is formed in a spiral groove shape having the same size as the outer diameter of the flow tube 28 of the spiral tube 29, and has a rotor shaft contact surface 53 on the outer circumference. The rotor shaft contact surface 53 has the same size as the inner diameter of the spiral tube housing portion 32.

Therefore, the rotor shaft contact surface 53 of the filler 51 and the spiral tube housing portion The inner peripheral surface of 32 is in contact with the tube contact surface 52 in contact with the flow tube 28 of the spiral tube 29.

Further, the filler 51 is rotated in the spiral tube housing portion 32 integrally with the spiral tube 29.

According to the kneading rotor 50 of the second embodiment, the filler 51 is filled between the flow tube 28 of the spiral tube 29 and the inner circumferential surface of the spiral tube housing portion 32 of the rotor shaft 27. Therefore, the gap between the inner circumferential surface of the spiral tube accommodating portion 32 and the flow tube 28 of the spiral tube 29 is filled, and the contact heat resistance can be reduced to improve the cooling ability.

(Third embodiment)

Next, the kneading rotor and the kneading machine according to the third embodiment of the present invention will be described.

As shown in Fig. 4, the kneading rotor 70 provided in the kneading machine 60 according to the third embodiment of the present invention has an elastic member 71 which is a spiral tube that faces the spiral tube 29 toward the rotor shaft 27. An elastic member that is biased on the inner circumferential surface of the accommodating portion 32.

The elastic member 71 is a spring member in which a leaf spring is formed into a circular shape, and the leaf spring is elastically deformed so as to be reduced in inner diameter, and is housed inside the flow tube 28 of the spiral tube 29 inside the spiral tube housing portion 32. The circumferential surface imparts an elastic pressure that biases the flow tube 28 toward the outer peripheral side.

In addition, the elastic member 71 rotates in the spiral tube accommodating portion 32 integrally with the spiral tube 29 in a state in which the flow tube 28 of the spiral tube 29 is pressed against the inner circumferential surface of the spiral tube accommodating portion 32.

According to the kneading rotor 70 of the third embodiment, the flow tube 28 of the spiral tube 29 is biased toward the inner circumferential surface of the spiral tube housing portion 32 of the rotor shaft 27 by the elastic member 71 as the elastic member.

Therefore, according to the kneading rotor 70, by narrowing the gap between the flow tube 28 of the spiral tube 29 and the inner circumferential surface of the spiral tube accommodating portion 32, the contact heat resistance can be reduced and the cooling ability can be improved.

Further, according to the kneading rotor 70, since the elastic member 71 as the elastic member is a spring member, material acquisition and processing are easy, and it is advantageous on the cost surface and the work surface.

(Fourth embodiment)

Next, the kneading rotor and the kneading machine according to the fourth embodiment of the present invention will be described.

As shown in Fig. 5, the kneading rotor 90 provided in the kneading machine 80 according to the fourth embodiment of the present invention includes a foaming member 91 that faces the flow pipe 28 of the spiral pipe 29 The elastic member of the inner peripheral surface of the spiral tube housing portion 32 of the rotor shaft 27 is biased.

The foaming member 91 is a foaming agent, and is filled in the spiral tube accommodating portion 32 of the rotor shaft 27, and then expands in volume by foaming, and is hardened in this state, and the flow tube 28 is directed toward the spiral tube accommodating portion by the expansion. The inner peripheral surface of 32 is pressed.

Further, the foamed member 91 can be pressed into the spiral tube accommodating portion 32 in a state where the foamed member 91 is deformed to be reduced in size after being hardened.

Foaming member 91 to press the flow tube 28 of the spiral tube 29 against the screw The state of the inner circumferential surface of the coil housing portion 32 is rotated integrally with the spiral tube 29 in the spiral tube housing portion 32.

According to the kneading rotor 90 of the fourth embodiment, the flow tube 28 of the spiral tube 29 is biased toward the inner circumferential surface of the spiral tube housing portion 32 of the rotor shaft 27 by the foaming member 91.

Therefore, according to the kneading rotor 90, the gap between the flow tube 28 of the spiral tube 29 and the inner circumferential surface of the spiral tube housing portion 32 is reduced, and the contact heat resistance can be reduced to improve the cooling ability.

(Fifth Embodiment)

Next, the kneading rotor and the kneading machine according to the fifth embodiment of the present invention will be described.

As shown in Fig. 6, the kneading rotor 110 provided in the kneading machine 100 according to the fifth embodiment of the present invention includes a spiral tube 111 having a rectangular shape in which one of the radial directions and the other square have a rectangular shape. Shaped flow tube 112.

The spiral tube 111 has a central introduction tube 113 that communicates with the flow tube 112 on the side of the closure portion 30 at a central portion in the radial direction of the axis 24 .

In addition, since the outer diameter of the plurality of flow tubes 112 and the inner diameter of the spiral tube accommodating portion 32 are substantially the same size, the spiral tube 111 is inserted in a state of being in surface contact with the inner circumferential surface of the spiral tube accommodating portion 32.

According to the kneading rotor 110 of the fifth embodiment, the flow tube 112 of the spiral tube 111 is in surface contact with the inner circumferential surface of the spiral tube accommodating portion 32, and the heat transfer area is increased. Therefore, the circulation of the spiral tube 111 can be reduced The contact resistance between the tube 112 and the inner peripheral surface of the spiral tube housing portion 32 increases the cooling capacity.

Further, the kneading rotor and the kneading machine of the present invention are not limited to the above-described respective embodiments, and suitable modifications, improvements, and the like can be performed.

For example, a plurality of the above-described embodiments can be combined with each other. Specifically, the elastic member 71 of the third embodiment and the foamed member 91 of the fourth embodiment can be used in combination with the filler 51 of the second embodiment.

According to the above-described kneading rotor and the kneading machine, by making the flow tube of the cooling medium a spiral tube, it is possible to suppress the cost and improve the cooling efficiency.

10‧‧‧mixer

20‧‧‧Rotor for mixing

22‧‧‧ wing

26‧‧‧Rotor body

27‧‧‧Rotor shaft

28‧‧‧Flow pipe

29‧‧‧Spiral tube

30‧‧‧Department

31‧‧‧ openings

32‧‧‧Spiral tube accommodating department

33‧‧‧Central introduction tube

34‧‧‧Extraction tube

C‧‧‧Cooling media

Claims (8)

A kneading rotor includes a rotor shaft and a spiral pipe; the rotor shaft is a tubular member, and a wing portion for kneading is provided on an outer peripheral surface; the spiral pipe is inserted into the rotor shaft to be a flow pipe It is formed in a spiral shape, and the flow tube internally flows a cooling medium to cool the rotor shaft. The kneading rotor according to the first aspect of the invention, wherein the spiral pipe is disposed in contact with an inner circumferential surface of the rotor shaft. The kneading rotor according to the first or second aspect of the invention, wherein a filler is filled between the spiral tube and an inner circumferential surface of the rotor shaft. The kneading rotor according to the first aspect of the invention, further comprising: a biasing member that biases the spiral tube toward an inner circumferential surface of the rotor shaft. The kneading rotor according to the fourth aspect of the invention, wherein the elastic member is an elastic member that accumulates an elastic repulsive force toward the outer circumference. The kneading rotor according to the fourth aspect of the invention, wherein the elastic member is a foam member having a repulsive force toward the outer circumference. The kneading rotor according to claim 1, wherein the flow pipe of the spiral pipe has a rectangular cross section. A kneading machine characterized by having a patent application scope The rotor for kneading described in item 1.