JPH0632010U - Sealing device for closed kneader - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a sealing device for a closed-type kneading machine that can obtain a suitable sealing pressure corresponding to the change in the internal pressure of the rotor support part of the kneading chamber and prolong the life of the sealing part . [Structure] Both side surfaces 12 of a kneading chamber 11 having openings 13 for supporting two rotating rotors 14, and openings 13 on both side surfaces are fitted into a rotor shaft portion 14b to close the openings. The seal ring 16 of the sealing face body, the seal ring 16 urged toward the seal face 16a of the collar ring and axially movable in the opening 13, and the seal ring In the sealing device 10 of the hermetic kneading machine, which comprises the adjusting means 26 for adjusting the pressure, the detecting means 1 for measuring the pressure in the kneading chamber 11 is a spectacle-shaped rotation locus formed by two rotors rotating in the kneading chamber. The adjusting means is operated based on the detecting means by being provided from the side surface so as to be directed to the space corresponding to the upper recess.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device for a rotor supporting portion of a hermetic kneader for kneading rubber or the like by rotating a rotor in a kneading chamber, and more particularly to adjusting means for adjusting the sealing pressure.

[0002]

[Prior art]

 As shown in FIG. 3, a rotor supporting portion of a hermetic type kneading machine for kneading rubber or the like has hitherto been provided with an opening 13 for supporting a rotor, which is fitted on a shaft 14b of a rotor 14 and provided on both side surfaces 12 of a kneading chamber 11. A mechanical seal is provided by a color ring 15 that closes the gap and a seal ring 16 that seals a gap between the color ring 15 and the opening 13 of the kneading chamber 11. Further, an urging force adding means for urging the seal ring 16 toward the color ring 15 to apply a constant sealing pressure against the pressure in the kneading chamber during the kneading process, and the sealing surface 16a of the seal ring 16. A lubricating mechanism 30 is provided for injecting lubricating oil into the rotor to improve rotation of the rotor 14 and prevent wear of the seal surface 16a.

By the way, the internal pressure of the kneading chamber 11 changes every moment during the kneading process, and at a constant sealing pressure, when the internal pressure of the kneading chamber 11 is reduced, an excessive sealing pressure is generated on the sealing surface 16a. Therefore, there is a problem in that the life of the seal portion is shortened.

Therefore, the conventional sealing device 33 as shown in FIG. 3 is an adjustment that indirectly detects the internal pressure change in the kneading chamber 11 and adjusts the seal pressure by the detection means 23 that detects the change during the kneading process. Means 17 are provided (see Japanese Patent Application Laid-Open No. 60-78631). In FIG. 3, 11 is a kneading chamber, 12 is a side surface of the kneading chamber, 13 is an opening, 14 is a rotor, 15 is a coloring ring, 16 is a seal ring, 17 is an adjusting means for adjusting the sealing pressure, and 30 is an oiling device. It is a mechanism.

The kneading chamber 11 is provided on both side surfaces 12 with an engaging portion 12b between the opening 13 and the seal ring 16 and a cooling passage 12a. The rotor 14 is axially supported by the opening portion 13, the engaging portion 12b seals the gap between the opening portion 13 and the color ring 16, and water or the like flows through the cooling passage 12a to prevent the temperature rise in the kneading chamber 11. .

The rotor 14 has flanges 14 a at both ends and is axially supported by the opening 13 of the side surface 12. The rotor 14 is connected to a drive motor and rotates at a variable speed in the kneading chamber 11 to remove rubber or the like. Knead.

The color ring 15 is a sealing face body that is fitted to the shaft 14 b outside the flange 14 of the rotor 14 and closes the opening 13 of the kneading chamber 11.

The seal ring 16 has an engaging portion 12b that engages with the side surface 12, is biased toward the seal surface of the color ring 15 via the yoke 18 of the adjusting means 17, and the color ring The gap between 15 and the opening 13 of the kneading chamber 11 is sealed. The color ring 15 and the seal surface 16a of the seal ring 16 are made of a cemented carbide so that wear and heat generation due to rotation of the rotor 14 are reduced. Reference numeral 16b is a cooling passage for flowing water or the like to cool the seal surface 16a.

The adjusting means 17 for adjusting the seal pressure includes a yoke 18, a hydraulic cylinder 19, a spring 20, a supply circuit 21 for supplying a liquid to the hydraulic cylinder 19, a pressure reducing valve 22, and a kneading device during a kneading process. It comprises a detecting means 23 for detecting a change.

The yoke 18 is swingably supported on the fixed side 18c by a yoke pin 18a. The upper portion of the yoke 18 is connected to the hydraulic cylinder 19, and the hydraulic cylinder 19 operates in the direction of arrow A against the mechanical spring 20 to allow the two cylinders to be attached to the lower end of the yoke 18. The pressing pin 18b biases the seal ring 16 to the left in the figure. The pressing pin 18b can be adjusted and fixed by a screw structure, and adjusts the sealing pressure of the seal surface 16a.

The hydraulic cylinder 19 is supplied with a liquid from a pump (not shown) via a supply circuit 21, and the hydraulic pressure is adjusted. The supply circuit 21 has a pressure reducing valve 22, and is connected via the pressure reducing valve 22 to a detection means 23 that detects changes during the kneading process. The detection means 23 is a thermometer, an electric power meter, a timer, etc., which are conventionally provided in a closed kneading machine. When the amount of powder in the initial stage of kneading is large, the hydraulic pressure is set high, and when the kneading in the latter half of the kneading progresses, When there is no load, the pressure reducing valve 22 is interlocked and controlled so as to lower the hydraulic pressure.

In the lubrication mechanism 30, an injection nozzle 31 is attached to the side surface 12 via a sleeve 32, and a tip end 31a of the nozzle is directed to the sealing surface 16a. An oil intake 31b is formed in the middle of the injection nozzle 31, and lubricating oil is supplied from the hydraulic pump 29. The hydraulic pump 29 is driven by a variable speed rotary pump motor. The lubricating oil is applied to the sealing surface 16a for 20 to 30 minutes in the kneading initial region B.

The conventional sealing device 33 as described above detects a change in the kneading process in the kneading chamber by using the detecting means 23 such as a thermometer, a power meter, and a timer conventionally provided in the closed kneader. By doing so, the pressure reducing valve 22 is interlockedly controlled according to the change, and the liquid supply amount in the supply circuit 21 is adjusted. For example, as shown in FIG. 4, in the initial kneading area B, both the electric power W and the temperature T suddenly increase. Therefore, at this time, the sealing surface pressure should be maintained at 5 Kgf / cm ² , and the kneading should proceed. In the latter half C of the kneading, the electric power W decreases and the temperature rises smoothly. Therefore, during this period, the pressure reducing valve 22 is interlocked with the liquid in the supply circuit 21 so that ² Kgf / cm ² is maintained. Adjust the supply.

In this way, by detecting a change in the kneading process of the kneading chamber that changes every moment, it is possible to detect the change in the internal pressure in the kneading chamber intermittently and provide the appropriate sealing pressure on the sealing surface. I am trying.

[0015]

However, the sealing device 33 of such a conventional closed-type kneading machine uses a thermometer, an electric power meter, a timer, etc. which are conventionally provided in the closed-type kneading machine. By detecting changes in the kneading process inside the kneading chamber, the changes in the internal pressure inside the kneading chamber are indirectly detected and the sealing pressure on the sealing surface is adjusted, so it is possible to accurately respond to changes in the internal pressure inside the kneading chamber. There was a problem that the proper sealing pressure could not be obtained.

The present invention has been made in view of the above problems, and an object thereof is to obtain an appropriate seal pressure corresponding to a change in internal pressure of a rotor support portion of a kneading chamber to prolong the life of the seal portion. The purpose is to provide a sealing device for a closed-type kneading machine.

[0017]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the sealing device of the hermetic kneading machine of the present invention has two side surfaces of a kneading chamber provided with openings for supporting two rotating rotors, and an opening on both side surfaces. A collar ring of a sealing face body that is fitted into the shaft portion of the rotor and closes the opening portion, a seal ring that is urged toward the sealing surface of the color ring and is provided so as to be axially movable in the opening portion, and the seal ring. In a sealing device of a hermetic kneading machine, which comprises an adjusting means for urging a pressure to adjust a sealing pressure, a detection means for measuring a pressure in the kneading chamber is a spectacle-shaped rotation formed by two rotors rotating in the kneading chamber. The adjusting means is operated based on the detecting means, provided from the side surface side so as to be directed to the space corresponding to the depression on the upper side of the locus.

[0018]

[Action]

 Detecting means for measuring the pressure in the kneading chamber is provided from the side surface side toward the space corresponding to the upper depression of the spectacle-shaped rotation locus formed by the two rotors rotating in the kneading chamber, and based on the detecting means, When the adjusting means is operated, the rotation of the rotor is not hindered, the internal pressure of the kneading chamber of the rotor support is accurately measured, and the seal pressure is adjusted appropriately according to the internal pressure change during the kneading process.

[0019]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a sealing device 10 of the hermetic kneader of the present invention, and FIG. 2 is a sectional view taken along line D-D of FIG. In FIG. 1, components having the same functions as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

1 is different from FIG. 3 in that the pressure sensor 1 constituting the detecting means 9 for measuring the internal pressure of the kneading chamber 11 is provided with two pressure sensors 1 which rotate in the kneading chamber 11 as shown in FIG. It is provided from the side 12 of the kneading chamber 11 so as to be directed to the space 4 corresponding to the upper recess of the eyeglass-shaped rotation locus formed by the rotor 14, and the adjusting means 26 is operated based on the detecting means 9. It is a point.

The space 4 will be described with reference to FIG. In FIG. 2, 2 is a floating weight, 3 is a weight stopper, 5 is a drop door, and 6 is a latch. The floating weight 2 is provided to push the material from above through the material supply port of the kneading chamber 11, and the weight stopper 3 stops the descent of the floating weight 2. The drop door 5 is provided on the material discharge side, and the door top 5b constitutes a part of the kneading chamber 11 during kneading, and after kneading, the door top 5b is opened so as to drop downward with 5a as a fulcrum. The latch 6 maintains and supports the closed state of the drop door 5 during kneading.

By the way, in the kneading chamber 11, the rotor 14 is rotating so that the blades 14c of the rotor 14 sweep the inner wall of the kneading chamber 11, and the locus thereof has a spectacle shape. In the upper recess of the eyeglass-shaped locus, that is, below the floating weight 2, the blade 14c moves as shown by the chain double-dashed line, so that the space 4 where the rotor 14 and the inner wall of the kneading chamber 11 do not contact each other is formed. To be done.

Therefore, if the pressure sensor 1 is oriented in this space 4 and installed from the side surface 12, the rotation of the rotor 14 is not hindered and the accurate internal pressure of the kneading chamber of the rotor 14 support portion can be measured. Of course, at this time, the floating weight 2 is stopped from descending by the weight stopper 3 and does not come into contact with the pressure sensor 1.

Next, referring to FIG. 1, the adjusting means 26 for adjusting the seal pressure and the detecting means 9 for measuring the internal pressure of the rotor supporting portion of the kneading chamber 11 will be described. The adjusting means 26 includes a hydraulic cylinder 19 similar to the conventional one, a yoke 18 similar to the conventional one, an electromagnetic switching valve 25, a comparative electromagnetic pressure reducing valve 28, and a check valve 28 a, and is pumped by a pump 27. Liquid from the tank 24 is supplied to the hydraulic cylinder 19 through these valves. The proportional electromagnetic pressure reducing valve 28 is controlled and operated based on the detecting means 9 described below.

The detection unit 9 includes the pressure sensor 1, the signal processing unit 7, and the control unit 8, controls the proportional electromagnetic pressure reducing valve 28, and operates the adjusting unit 26. In the signal processing unit 7, the signal from the pressure sensor 1 is subjected to signal processing for controlling the proportional electromagnetic pressure reducing valve 28 by removing minute fluctuations by the averaging device 7a. Then, the control section 8 controls the proportional electromagnetic pressure reducing valve 28. For example, if the internal pressure of the kneading chamber is high at the beginning of the kneading, 5 K gf / cm ² is maintained, and if it is low at the end of the kneading, ² Kgf / cm ² is maintained. Open and close.

In the sealing device 10 of the present invention configured as described above, at the time of kneading, the pressure sensor 1 measures the internal pressure of the kneading chamber 11 of the rotor 14 supporting portion without hindrance to the rotation of the rotor 14. .. Then, in order to obtain a sealing pressure adapted to the internal pressure of the kneading chamber 11, for example, when the internal pressure of the kneading chamber 11 is high at the initial stage of kneading, in order to maintain 5 Kgf / cm ² The proportional electromagnetic pressure reducing valve 28 is opened and closed so as to maintain ² Kgf / cm ² , thereby adjusting the liquid supply amount of the hydraulic cylinder 19. Then, the pressing pin 18b under the yoke 18 biases the seal ring 16 toward the collar ring 15 with an appropriate biasing force. In this way, the sealing device 10 of the present invention obtains an appropriate sealing pressure corresponding to the internal pressure of the rotor 14 supporting portion during the kneading process. As a result, the life of the seal portion is extended.

[0027]

[Effect of device]

 The sealing device of the closed type kneading machine of the present invention is provided with the detecting means for measuring the pressure in the kneading chamber on the side surface of the kneading chamber so as to be directed to the space which does not come into contact with the rotor rotating in the kneading chamber. By interlocking with the adjusting means, the internal pressure of the kneading chamber of the rotor support can be measured accurately without interfering with the rotation of the rotor, and the seal pressure can be adjusted appropriately in response to changes in the internal pressure of the kneading chamber. The life of the seal part can be extended.

[Brief description of drawings]

FIG. 1 is a view showing a sealing device of a hermetic kneader of the present invention.

FIG. 2 is a sectional view taken along line DD of FIG.

FIG. 3 is a view showing a sealing device of a conventional hermetic kneader.

FIG. 4 is a diagram showing temporal changes in electric power and temperature in the kneading chamber.

[Explanation of symbols]

 10 sealing device 1 pressure sensor 4 space 11 kneading chamber 12 side surface 13 opening 14 rotor 14b shaft 15 color ring 16a sealing surface 16 seal ring 26 adjusting means

Claims (1)

[Scope of utility model registration request] 1. A kneading chamber provided with two rotating rotor openings for supporting each of the two sides, and a sealing face body which is fitted into the shaft portion of the rotor by the openings on the both sides and closes the openings. A hermetic seal including a color ring, a seal ring that is urged toward a seal surface of the color ring and axially movable in an opening, and an adjusting unit that urges the seal ring to adjust a seal pressure. In the sealing device of the kneading machine, the detecting means for measuring the pressure in the kneading chamber is directed to the space corresponding to the upper depression of the spectacle-shaped rotation locus formed by the two rotors rotating in the kneading chamber, and the side surface side. A sealing device for a hermetic kneader, characterized in that the adjusting means is operated based on the detecting means.