JP4614553B2 - Rubber kneader seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure of a rubber kneading apparatus for kneading rubber by a rotor rotating in the opposite direction.
[0002]
[Prior art]
Generally, in a rubber kneading apparatus that kneads rubber by a rotor that rotates in the opposite direction, in order to prevent leakage of carbon, rubber, etc. from the chamber to the outside and entry of dust, foreign matter, etc. from the outside into the chamber, Sealing mechanisms are provided for sealing between both ends of the rotor and the housing.
[0003]
Here, as such a sealing mechanism, for example, a first ring that is fitted to both ends of the rotor and rotates together with the rotor, and attached to the housing, and is in sliding contact with the first ring. The second ring that seals between both ends of the housing and the housing is known, but the sliding contact portion of the first and second rings is conventionally made of Co, typified by stellite. -Cr-W alloy was used.
[0004]
[Problems to be solved by the invention]
However, in recent years, as the efficiency of rubber kneading work has increased, the rubber kneading apparatus has become larger and faster, so the surface pressure and sliding speed at the sliding contact portions of the first and second rings have increased. The first and second rings made of such a Co—Cr—W alloy have a problem that they are worn out at an early stage.
[0005]
An object of the present invention is to provide a seal structure for a rubber kneading apparatus capable of extending the life by reducing wear.
[0006]
[Means for Solving the Problems]
Such a purpose includes a housing in which a chamber is formed, and a pair of rotors whose both ends are rotatably supported by the housing and kneading rubber in the chamber by a plurality of blades formed in the center. Provided in the rubber kneading apparatus, respectively fitted to the outer ends of both ends of the rotor, and rotated with the rotor, attached to the housing, and slidably contacted with the first ring, whereby both ends of the rotor and the housing In the seal structure of the rubber kneading apparatus having a second ring that seals between the first ring and the second ring, either one of the sliding contact portions of the first ring or the second ring is 1.0 to 3.8 wt% Fe, 7.5 to 39.0 wt% % Of W and 2.9 to 3.7% by weight of a Ni—Cr—B—Si alloy, and the other of the sliding contact portions of the first ring or the second ring is made 0.8 to 4.8% by weight of Fe. , 0.1-0 It can be achieved by comprising a Ni-Cr-B-Si alloy containing .9 wt% C and 2.0-2.8 wt% B.
[0007]
As described above, when the sliding contact portions of the first and second rings are made of a Ni—Cr—B—Si alloy containing B (boron), a high hardness boride, particularly boron, is formed in these sliding contact portions. Since chromium fluoride is dispersed and precipitated, wear resistance is improved. Here, when the weight percentage of B contained is a value within the above-described range, a member having a small B content is actively worn, and the wear of a member having a large B content is strongly reduced. Further, it is possible to effectively suppress the wear of the member having a low B content, thereby reducing the total wear amount of both members and extending the life.
[0008]
Moreover, if comprised as described in Claim 2, heat resistance and corrosion resistance will become favorable, and it can fully endure the severe use environment at the time of rubber kneading | mixing.
Furthermore, if constituted as in claim 3, the amount of wear can be further reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1 and 2, 11 is a rubber kneading device generally called a Banbury mixer. The rubber kneading device 11 has a main body 13 in which a space for kneading rubber, that is, a chamber 12 is formed. In addition, an inlet 14 communicating with the chamber 12 is formed at the upper end of the main body 13, and unkneaded rubber is introduced into the chamber 12 through the inlet 14. Further, end plates 15 are fixed to both side ends of the main body 13, respectively. The main body 13 and the end plate 15 described above constitute a fixed housing 16 of the rubber kneading device 11 as a whole.
[0010]
Reference numeral 19 denotes a pair of horizontal rotors extending in parallel to each other. The central portions of these rotors 19 are located in the chamber 12, and both end portions thereof are inserted into the end plate 15, respectively. Reference numerals 20 denote bearings interposed between the end plate 15 and both end portions of the rotor 19, and both end portions of the rotor 19 are rotatably supported by the housing 16 by these bearings 20. A plurality of blades 21 are respectively formed on the outer periphery of the central part of the rotors 19, and these blades 21 are arranged symmetrically with each other or are shifted from each other so as to mesh with each other. When the rotor 19 is rotated in the reverse direction by the driving means (not shown), that is, one is rotated clockwise and the other is rotated counterclockwise, the rubber in the chamber 12 is kneaded by these blades 21. .
[0011]
24 is a seal mechanism that is interposed between the housing 16, more specifically between the end plate 15 and both ends of the rotor 19, and seals between them. In addition, leakage of rubber and the like, and entry of dust and foreign matter into the chamber 12 from the outside are prevented. Each sealing mechanism 24 has cylindrical collars 25 fitted and fixed to the outer sides of both ends of the rotor 19, and a floating ring 26 as a first ring having a substantially cylindrical shape is axially disposed outside these collars 25. It is fitted to be movable.
[0012]
Reference numeral 27 denotes a spring receiver fixed to the outer end of each floating ring 26 in the axial direction, and a rear end portion of a bolt 28 whose tip portion is screwed and fixed to the collar 25 is slidably inserted into the spring receiver 27. As a result, the floating ring 26 can rotate together with the rotor 19. Reference numeral 29 denotes a spring having a small spring constant provided so as to surround the bolt 28.These springs 29 are interposed between the spring receiver 27 and the collar 25, and the floating ring 26 is directed outward in the axial direction with a weak biasing force. Energize.
[0013]
The floating ring 26 has a small-diameter portion 26a formed on the outer side in the axial direction and a large-diameter portion 26b formed on the inner side in the axial direction, and a step portion extending in the radial direction at the boundary between the small-diameter portion 26a and the large-diameter portion 26b. 26c is formed. Reference numeral 31 denotes a wear ring as a ring-like second ring attached to the housing 16, specifically, the radially inner end of the end plate 15. The axial inner end surfaces 31 a of these wear rings 31 are formed on the floating ring 26. It contacts the stepped portion 26c.
[0014]
When the rotor 19 rotates in such a state, the floating ring 26 also rotates, so that the inner end surface 31a of the wear ring 31 and the stepped portion 26c of the floating ring 26 come into sliding contact with each other through the lubricating oil. The gap between both ends of 19 and the housing 16 is sealed. Here, when the rubber is kneaded, the rubber passes between the end plate 15 and the collar 25 and reaches the inner end surface in the axial direction of the floating ring 26, and presses the floating ring 26 toward the outer side in the axial direction with a large force.
[0015]
As a result, the stepped portion 26c of the floating ring 26 and the inner end surface 31a of the wear ring 31 are slidably contacted with each other through the lubricating oil under a high surface pressure. In particular, the rubber kneading device 11 has recently increased in size and the rotation of the rotor 19 As the speed increases, the surface pressure between the stepped portion 26c and the inner end surface 31a increases, and the sliding contact portion of the floating ring 26 and the wear ring 31 may be worn at an early stage. is there.
[0016]
For this reason, at least the sliding contact part of either the floating ring 26 or the wear ring 31, in this embodiment, the entire floating ring 26, is Ni-Cr-B containing 2.9 to 3.7 wt% B (boron, boron). -Si alloy (typically Colmonoy) and at least the other sliding contact portion of the floating ring 26 or the wear ring 31, in this embodiment, the entire wear ring 31 contains 2.0 to 2.8% by weight of B. It is comprised from the Ni-Cr-B-Si alloy containing.
[0017]
When at least the sliding contact portions of the floating ring 26 and the wear ring 31 are made of a Ni-Cr-B-Si alloy containing B, a high hardness boride, particularly chromium boride, is formed in these sliding contact portions. Since it is dispersed and precipitated, the wear resistance is improved.
[0018]
Here, if the weight% of B contained is a value within the range as described above, the wear ring 31 as a consumable item with a low B content is actively worn to cause a floating ring 26 with a high B content. The wear of the wear ring 31 as a consumable with a low B content can be effectively suppressed while enabling the permanent use of the floating ring 26, thereby effectively reducing the wear of the wear ring 31. As a result, the total wear amount of the floating ring 26 and the wear ring 31 is reduced, and the life can be extended.
[0019]
The floating ring 26 and the wear ring 31 described above are exposed to harsh usage environments when kneading rubber, so a Ni-Cr-B-Si alloy having good heat resistance and corrosion resistance, for example, 8.0 to 16.0% by weight of Cr. It is preferable to use a nickel-based (comprising Ni and inevitable impurities) Ni—Cr—B—Si alloy containing 2.0 to 16.0% by weight of Si. In this embodiment, in order to further improve the above-described performance, an alloy having a high B content contains 1.0 to 3.8 wt% Fe and 7.5 to 39.0 wt% W (tungsten) instead of Ni. , whereas, in the less alloys B content, 0.8 to 4.8 wt% of Fe, and 0.1 to 0.9 wt% of C (carbon) is contained in place and Ni.
[0020]
Further, the difference in hardness between the Rockwell hardness HRc of the floating ring 26 and the Rockwell hardness HRc of the wear ring 31 is preferably in the range of 5 to 14 degrees. The reason is that the total wear amount of the floating ring 26 and the wear ring 31 can be further reduced if the hardness difference between the floating ring 26 and the wear ring 31 is within the above-mentioned range.
[0021]
3 and 4 are views showing a second embodiment of the present invention. In this embodiment, a wear ring 35 as a first ring is fitted to both ends of the rotor 19 and is pressed against the step portion 19a of the rotor 19 by a wear ring collar 36 and a wear ring clamp 37. . As a result, the wear ring 35 can rotate together with the rotor 19.
[0022]
Reference numeral 38 denotes a ground ring which does not rotate as a second ring attached to the inner end in the radial direction of the end plate 15, and these ground rings 38 can move a little in the axial direction. Reference numeral 39 denotes a transmission arm extending in the radial direction, and a bolt 40 screwed into the end plate 15 is inserted in the central portion of the transmission arm 39.
[0023]
41 is a hydraulic cylinder fixed to the radially outer end of the transmission arm 39, and the piston rod 42 of these hydraulic cylinders 41 is fixed to the radially outer end of the end plate 15. When these hydraulic cylinders 41 are operated and the piston rod 42 protrudes, the transmission arm 39 swings counterclockwise in FIG.
[0024]
Further, the inner end portion in the radial direction of the transmission arm 39 is bifurcated, and the inner end in the radial direction is in contact with the outer end surface 38a in the axial direction of the ground ring 38. As a result, when the transmission arm 39 swings counterclockwise as described above, the axial inner end surface 38b of the ground ring 38 is strongly pressed against the axial outer end surface 35a of the wear ring 35. At this time, if the rotor 19 is rotating, the wear ring 35 and the ground ring 38 are in sliding contact with each other via the lubricating oil, and thereby the gap between both ends of the rotor 19 and the housing 16 is sealed.
[0025]
As described above, when the wear ring 35 and the ground ring 38 are in sliding contact with each other under a large surface pressure, these sliding contact portions may be worn at an early stage. Therefore, at least the sliding contact portion of either the wear ring 35 or the ground ring 38, in this embodiment, the entire ground ring 38 is composed of a Ni—Cr—B—Si alloy containing 2.9 to 3.7% by weight of B. In addition, at least the other sliding contact portion of the wear ring 35 or the ground ring 38, in this embodiment, the entire wear ring 35 is made of a Ni—Cr—B—Si alloy containing 2.0 to 2.8 wt% B. ing.
[0026]
In the first embodiment described above, the floating ring 26 is made of a Ni—Cr—B—Si alloy containing 2.9 to 3.7% by weight of B, while the wear ring 31 is made of Ni containing 2.0 to 2.8% by weight of B. In this invention, the wear ring is made of a Ni-Cr-B-Si alloy containing 2.9 to 3.7% by weight of B, while the floating ring is made of 2.0 to 2.8% by weight. You may comprise from the Ni-Cr-B-Si alloy containing B.
[0027]
In the first embodiment described above, the entire floating ring 26 and wear ring 31 are made of the aforementioned Ni-Cr-B-Si alloy. However, in the present invention, the floating ring and the wear ring are in sliding contact portions. It is also possible to fix the slidable contact plates made of the above-described Ni—Cr—B—Si alloy and bring these slidable plates into slidable contact. Furthermore, in the second embodiment described above, the force from the hydraulic cylinder 41 is transmitted to the ground ring 38 via the transmission arm 39, and the ground ring 38 is pressed against the wear ring 35. The ground ring may be pressed against the wear ring by another type of pressing mechanism.
[0028]
【Example】
Next, test results will be described. First, at the start of the first test, all contained 11.5 wt% Cr, 14.0 wt% Si, 17.3 wt% W, 3.5 wt% Fe, and B 2.8, 2.9, 3.0, 3.4, 6 types of floating rings composed of nickel-based Ni-Cr-B-Si alloy containing 3.7 and 3.8 wt%, 12.5 wt% Cr, 4.0 wt% Si, 0.7 wt% C and 4.5 wt% Fe %, And a wear ring made of a nickel-based Ni—Cr—B—Si alloy containing 2.75% by weight of B was prepared.
[0029]
Next, such a floating ring and a wear ring were combined to form a seal mechanism, and such a seal mechanism was mounted on a large rubber kneader and operated at a normal operating rate for two years. Thereafter, the floating ring and wear ring were removed and the amount of wear was measured.
[0030]
The total wear amount is shown in Fig. 5. When the B weight% of the floating ring is less than 2.9%, the wear resistance of the floating ring and wear ring approximates each other. If the B weight% exceeds 3.7 (the management standard), while the B weight percentage exceeds 3.7, the wear resistance of the floating ring and wear ring will be too far away, so the wear ring will become abrupt and the total wear amount will be within the allowable range (control) The standard (3mm) is exceeded. For this reason, the weight percentage of B in a member for permanent use, here a floating ring, must be in the range of 2.9 to 3.7.
[0031]
Next, at the start of the second test, all contained 12.5 wt% Cr, 4.0 wt% Si, 0.7 wt% C, 4.5 wt% Fe, and B was 1.8, 2.0, 2.3, 2.75, respectively. , 2.8, 2.9 wt% nickel-based Ni-Cr-B-Si alloy wear ring, 11.5 wt% Cr, 14.0 wt% Si, 17.3 wt% W, 3.5 Fe A floating ring made of a nickel-based Ni—Cr—B—Si alloy containing 3.0% by weight of B and 3.0% by weight of B was prepared.
[0032]
Next, such a wear ring. Each of the floating rings was combined to form a seal mechanism, and such a seal mechanism was mounted on a large rubber kneader and operated at a normal operating rate for two years. Thereafter, the wear ring and the floating ring were removed and the amount of wear was measured.
[0033]
The total amount of wear is shown in Fig. 6. If the B weight% of the wear ring is less than 2.0%, the wear resistance of the floating ring and wear ring will be too far away, so the wear ring will be sudden and the total wear amount will be within the allowable range. If the B weight% exceeds 2.8, the wear resistance of the floating ring and wear ring approximates, and both wear out and the total wear amount is within the allowable range (control) The standard (3mm) is exceeded. For this reason, the weight percentage of B in the consumable part, here the wear ring, must be in the range of 2.0 to 2.8.
[0034]
【The invention's effect】
As described above, according to the present invention, it is possible to extend the life by reducing wear.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a rubber kneading apparatus showing a first embodiment of the present invention.
FIG. 2 is a front sectional view of the vicinity of a seal mechanism.
FIG. 3 is a front sectional view in the vicinity of an end plate of a rubber kneading apparatus showing a second embodiment of the present invention.
FIG. 4 is a front sectional view of the vicinity of a seal mechanism.
FIG. 5 is a graph showing the relationship between the weight% of B and the total wear amount.
FIG. 6 is a graph showing the relationship between the weight% of B and the total amount of wear.
[Explanation of symbols]
11 ... Rubber kneader 12 ... Chamber
16 ... Housing 19 ... Rotor
21 ... Wings 26 ... First ring
31 ... The second ring

Claims (3)

Provided in a rubber kneading apparatus comprising a housing in which a chamber is formed, and a pair of rotors whose both ends are rotatably supported by the housing and kneading rubber in the chamber by a plurality of blades formed in the center. The first ring that is fitted to the outer side of both ends of the rotor and rotates together with the rotor, and is attached to the housing, and is slidably contacted with the first ring to seal between the both ends of the rotor and the housing. in the sealing structure of the rubber kneading apparatus and a second ring, one of the sliding contact portion of the first-ring or the second ring, 1.0 to 3.8 wt% of Fe, 7.5 to 39.0 wt% of W and 2.9 It is composed of a Ni-Cr-B-Si alloy containing 3.7% by weight of B, and the other sliding contact portion of the first ring or the second ring is made 0.8-4.8% by weight of Fe, 0.1-0.9% by weight. % C and 2 A rubber kneader sealing structure characterized by comprising a Ni-Cr-B-Si alloy containing 0.0 to 2.8 wt% B.     The rubber kneading apparatus according to claim 1, wherein the Ni-Cr-B-Si alloy constituting the first and second rings is a nickel base alloy containing 8.0 to 16.0 wt% Cr and 2.0 to 16.0 wt% Si. Seal structure.     The seal structure of the rubber kneading apparatus according to claim 1, wherein a hardness difference between the Rockwell hardness of the first ring and the Rockwell hardness of the second ring is in a range of 5 to 14 degrees.

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