JP2004232290A - Pug mill mixer for mixing asphalt mixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remarkably improve durability of a paddle arm; and to easily and inexpensively perform maintenance work. <P>SOLUTION: In the paddle arm 4 of a pug mill mixer, a protective plate part 12 for covering a bolt 11a and a nut for detachably fixing a paddle chip 5 is protrusively arranged on the opposite side of the paddle chip 5 in a part becoming the preceding side in the rotatably moving direction A of a chip installing part 10a for fixing the paddle chip 5, and a liner divided into an arm liner 13 and a base part liner 17 of an abrasion resistant material is detachably installed on a front face 10b and a side surface 9b becoming the preceding side in the rotatably moving direction A of an arm part 10 and an installing base part 9 by a bolt 14a and a nut, and an installing bolt 16a and a fixing nut 16b. A protective plate part 13b for covering the bolt 14a and the nut is protrusively arranged on the back face side of the arm liner 13 on the preceding side in the rotatably moving direction A in the arm liner 13. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is installed in an asphalt plant or a road surface regenerator, etc., to produce an asphalt mixture by mixing the aggregate and asphalt melt, or to mix the recycled aggregate with the asphalt mixture to produce a regenerated asphalt mixture. The present invention relates to a pug mill mixer used for the above.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a pug mill mixer of an asphalt plant for producing an asphalt mixture (asphalt mixture) has a plurality of paddle arms mounted radially around an outer periphery of a shaft rotatably provided in a mixer casing. A paddle tip made of an abrasion-resistant material is fixedly provided at a tip mounting portion at the tip, and the shaft is rotated by a driving means to stir the asphalt mixture in a mixer casing with the paddle tip. . When the asphalt mixture is stirred, an abrasion prevention cover is attached to the shaft in order to prevent the aggregate in the asphalt mixture from gradually coming into contact with the shaft and the paddle arm and leading to breakage. (For example, see Patent Document 1) and those in which a shaft cover and an arm cover made of a wear-resistant material are attached to the shaft and the paddle arm (for example, see Patent Document 2). .
[0003]
[Patent Document 1]
JP 2001-140208 A [Patent Document 2]
Japanese Utility Model Laid-Open No. 3-79314 [0004]
[Problems to be solved by the invention]
However, in the conventional pug mill mixer, in the former case, although the shaft can be prevented from being worn by the wear preventing cover, the paddle arm is not provided with any wear preventing means, so that its durability is improved. There is a problem that cannot be maintained. In the latter case, both the shaft and the paddle arm can be prevented from being worn by the shaft cover and the arm cover, but both the shaft cover and the arm cover are attached to the paddle arm from the tip end side of the paddle arm. After being inserted into the shaft and the paddle arm, the paddle tip is attached to the tip of the paddle arm with a bolt to prevent each cover from coming off the shaft or the paddle arm. When the bolts for attaching the paddle arm to the paddle arm become worn and cannot hold the paddle chip, the paddle chip falls off the paddle arm, and the respective covers come off the shaft and the paddle arm. Not only can not prevent the Together may be damaged, and if not remove the paddle tip from the paddle arm, wherein each cover can not be removed from the shaft and paddle arm, their replacement easier, there is a problem that promptly performed.
[0005]
The present invention has been made in view of the above circumstances, and it is possible to dramatically improve the durability of a paddle arm, and to easily and inexpensively perform maintenance work for asphalt mixture mixing. It is intended to provide a pug mill mixer.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a pug mill mixer for asphalt mixture mixing according to claim 1 of the present invention comprises a plurality of paddle arms diametrically arranged around a shaft rotatably provided in a mixer casing. The paddle tip is fixed to a tip attaching portion of the paddle arm, and the paddle tip is fixed to the paddle arm, and the shaft is rotated by a driving means to stir the asphalt mixture in the mixer casing. A protection plate portion that covers a bolt and a nut for detachably fixing the paddle chip is provided at a portion on the leading side in the rotational movement direction of the chip attachment portion for fixing the paddle chip so as to protrude on the opposite side to the paddle chip. It is characterized by.
[0007]
A pug mill mixer for asphalt mixture mixing according to claim 2, wherein a plurality of paddle arms are mounted on an outer periphery of a shaft rotatably provided in a mixer casing in a diametrical direction, and paddles are mounted on chip mounting portions of the paddle arm. In a pug mill mixer in which a chip is fixed and the shaft is rotated by driving means to stir the asphalt mixture in the mixer casing, the paddle arm has a wear-resistant front surface which is a leading side in the rotational movement direction. A liner made of a conductive material is detachably attached with bolts and nuts.
[0008]
The pug mill mixer for mixing asphalt mixture according to claim 3 is the pug mill mixer according to claim 1, wherein the paddle arm is formed of a wear-resistant material on a front surface which is a leading side in a rotational movement direction. The liner is detachably attached with bolts and nuts.
[0009]
The pug mill mixer for asphalt mixture mixing according to claim 4 is the pug mill mixer according to claim 2 or 3, wherein the liner is connected to an arm liner attached to an arm portion of the paddle arm and the shaft of the paddle arm. And a base liner to be attached to a mounting base of the paddle arm.The arm liner has a protection plate portion covering the bolts and nuts on a portion which is a leading side in the rotational movement direction of the paddle arm, and has a rear surface of the paddle arm. It is characterized by being provided so as to protrude to the side.
[0010]
The pug mill mixer for asphalt mixture mixing according to claim 5 is the pug mill mixer according to claim 4, wherein the arm liner has both ends in the axial direction of the paddle arm and paddles on the protection plate portion of the paddle arm. It is characterized in that it is provided so as to be in contact with an inner end portion of the arm in the axial direction and a mounting portion of the base liner with respect to the mounting base.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a pug mill mixer for mixing an asphalt mixture according to an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a pug mill mixer for mixing an asphalt mixture according to one embodiment of the present invention. The pug mill mixer 1 is a two-axis pug mill mixer installed in an asphalt plant, and is formed by connecting both side walls 2b, 2b to both end walls 2a, 2a (only one is shown) in plan view. A mixer casing 2 having a bottom part 2e having two arc parts 2d, 2d in front view (transverse cross section view) formed at the lower part of a rectangular box body 2c and having an open upper part, Two parallel shafts 3, 3 supported by bearings on both end walls 2 a, 2 a and rotatably provided in the mixer casing 2, and are detachably attached to the outer periphery of the shafts 3, 3. A plurality of diametrically oriented paddle arms 4, a paddle tip 5 made of a wear-resistant material removably fixed to the tip of the paddle arm 4, and the shafts 3, 3 are synchronously deflected with each other. And a driving means for rotating the direction (not shown).
[0012]
By rotating the shafts 3 and 3 by the driving means, the dry aggregate, the filler and the asphalt melt supplied in the mixer casing 2 are mixed by the stirring action of the paddle chip 5 to mix the asphalt mixture. After manufacturing the asphalt mixture, the gate 7 provided at the outlet 6 opened at the bottom 2e of the mixer casing 2 is opened, and the produced asphalt mixture is taken out from the outlet 6.
The mixer arm 8 having the paddle chip 4 attached to the paddle arm 4 has a plurality of mixer arms attached in the circumferential direction of each shaft 3. The mixer arm group has a phase in the circumferential direction along the axial direction of the shaft 3. A plurality of groups are provided so as to be different from each other, and the paddle chips 5 of the mixer arm 8 adjacent in the axial direction of the shaft 3 are inclined in directions opposite to each other with respect to the axial direction of the shaft 3, and the asphalt mixture by the paddle chips 5 is formed. Can enhance the stirring effect.
[0013]
Next, details of the mixer arm 8 will be described with reference to FIGS.
The paddle arm 4 is integrally fixed to a mounting base 9 having a rectangular shape in plan view (FIG. 3) and a U-shaped cross section, and is integrally fixed to the outer surface 9a side of the mounting base 9. The arm 10 is perpendicular to or slightly inclined from the perpendicular, and is provided at an angle of approximately 45 degrees with respect to the axial direction of the shaft 3. The tip mounting portion 10a at the tip of the arm 10 The paddle chip 5 similarly inclined at approximately 45 degrees is inserted into the front end mounting portion 10a from the front side of the paddle chip 5 on the front surface (the surface on the leading side in the rotational movement direction a of the paddle arm 4) 10b. It is detachably fixed by a pair of bolts 11a, 11a and a pair of nuts 11b, 11b screwed to these. The leading end 10c of the tip mounting portion 10a in the rotational movement direction a of the paddle arm 4 (mixer arm 8) is provided with the bolt 11a toward the rear surface 10d opposite to the front surface 10b of the chip mounting portion 10a. The protection plate portion 12 protruding slightly higher than the protruding length is provided integrally.
[0014]
An arm liner (liner) made of a wear-resistant material extends over substantially the entire length of the arm portion 10 between the chip mounting portion 10a and the mounting base 9 along the front surface 10b of the arm portion 10. 13 is mounted, and is detachably fixed by one bolt 14a inserted into the arm portion 10 from the front surface 13a side of the arm liner 13 and a nut 14b screwed to the bolt 14a. At the leading end 13b of the arm liner 13 in the direction of the rotational movement of the paddle arm 4, a protection projecting slightly higher than the projecting length of the bolt 14a toward the rear surface 13c opposite to the front surface 13a of the arm liner 13. The plate part 15 is provided integrally. The mounting base 9 of the paddle arm 10 has a square fitting groove 9c formed on the inner surface 9b side thereof fitted to a half circumference of the square shaft portion 3a of the shaft 3, and has a diametrically opposite direction of the shaft 3. A pair of mounting bolts (bolts) 16a, 16a are respectively inserted through a pair of bolt holes on both sides of the paddle arm 4 together with the mounting base 9 of the paddle arm 4 which is mounted on the other side and screwed to them. It is detachably fixed to the shaft 3 by tightening the fixing nuts (nuts) 16b.
[0015]
Further, a base liner (liner) 17 made of an abrasion-resistant material that covers substantially the entire surface of the side surface 9d is provided on a side surface 9d on the leading side in the rotational movement direction a of the paddle arm 4 in the mounting base 9 in a direction perpendicular thereto. The mounting plate (mounting portion) 17a formed integrally with the mounting base 9 is detachably mounted on the outer surface 9a of the mounting base 9 with the mounting bolt 16a and the fixing nut 16b. The mounting plate portion 17a is formed in a deformed pentagon having an inclined side along an inclined surface of the front surface 10b of the arm portion 10 of the paddle arm 4 in plan view (FIG. 3). Its inner end (lower end in FIGS. 2, 4 and 5) 13d abuts on the outer surface 17b along the inclined side of the mounting plate 17a, and its outer end (FIGS. 2, 4 and 5). The upper end 13e abuts on the inner end (lower end in FIGS. 2, 4, and 5) 12a of the protection plate portion 12 of the chip mounting portion 10a, and is positioned, so that the arm liner 13 is mounted on the arm portion 10. The arm liner 13 is not easily detached from the arm portion 10 even if the operation is performed with one bolt 14a and nut 14b.
[0016]
In the pug mill mixer for asphalt mixture mixing according to the embodiment, when the asphalt mixture (asphalt mixture) is produced in the asphalt plant, the shafts 3 are opposed to each other by the driving means (not shown). The dry aggregate, the filler, the asphalt melt, and the like supplied in the mixer casing 2 are synchronously rotated in the direction of the arrow a, and are mixed by the paddle chip 5 of the paddle arm 4 in the mixer arm 8. At this time, the front surface of the mixer arm 8 on the leading side in the rotational movement direction a of the paddle arm 4 and the paddle chip 5 comes into contact with the aggregate in the asphalt mixture, and thus is subjected to an abrasion action.
[0017]
However, since the paddle tip 5 is made of a wear-resistant material, it hardly wears. On the other hand, the paddle arm 4 has an arm liner 13 made of a wear-resistant material attached to the front surface 10b on the leading side in the rotational movement direction a of the arm portion 10, and a paddle of the attachment base 9 to the shaft 3. Since the base liner 17 made of an abrasion-resistant material is attached to the leading side surface 9d of the arm 4 in the rotational movement direction a, the front surface 10b of the arm portion 10 and the side surface 9d of the attachment base 9 are directly in the asphalt mixture. Of the front surface 10b and the side surface 9d are not worn.
[0018]
Moreover, since the protection plate portion 12 is provided at the leading end portion 10c in the rotational movement direction a of the arm portion 10 at the chip attachment portion 10a of the arm portion 10, the paddle chip 5 is attached to the chip attachment portion 10a. The bolts 11a and the nuts 11b do not directly collide with or contact the relatively flowing aggregate, so that the wear of the bolts 11a and the nuts 11b can be reduced as much as possible. It is possible to prevent the paddle tip 5 from falling off from the arm portion 10 (paddle arm 4) due to wear of the nut 11b.
[0019]
Further, since the protection plate portion 15 is provided at the leading end 13b of the arm liner 13 in the rotational movement direction a of the arm portion 10, a bolt 14a and a nut 14b for attaching the arm liner 13 to the arm portion 10 are relatively provided. The abrasion of the bolts 14a and the nuts 14b can be reduced as much as possible without being strongly pressed or contacted by the flowing aggregates. The arm 10 (paddle arm 4) can be prevented from falling off, and the arm 10 can be reliably prevented from being worn.
[0020]
Further, the front side surface 9d of the mounting base 9 of the paddle arm 4 in the rotational movement direction a is prevented from being worn by the base liner 17, so that the head of the mounting bolt 16a for mounting the mounting base 9 to the shaft 3 is supported. The support surface is damaged due to abrasion and the mounting bolt 16a is loosened as in the prior art, and the head of the fixing bolt 16a also wears out, so that the mounting base 9 cannot be fixed to the shaft 3. It is possible to reliably prevent the situation where the arm 4 falls off.
[0021]
When the pug mill mixer 1 performs the stirring operation of the asphalt mixture for a long period of time, the paddle chip 5, the arm liner 13 and the base liner 17 of the mixer arm 8 are gradually formed even if they are made of a wear-resistant material. Since it is worn, it is necessary to perform a maintenance operation for checking the worn state and replacing it with a new one. In this case, since the mixer arm 8 (paddle arm 4) receives a wear action based on a difference in peripheral speed or the like depending on the diametrical distance from the shaft 3, the paddle tip 5, the arm liner 13, and the base liner 17 has a different degree of wear and a different replacement time. At the required time, the bolts 11a and 14a, the nuts 11b and 14b, the mounting bolt 16a, and the fixing nut 16b are removed and replaced. At this time, the bolts 11a and 14a and the nuts 11b and 14b, the mounting bolt 16a and the fixing nut 16b are combined with the protection plate 12 provided on the chip mounting portion 10a of the arm 10 and the protection plate 15 provided on the arm liner 13. The wear is prevented by the base liner 17 provided on the mounting base 9, so that the screw portions are not worn out and tightened, so that the loosening operation is not disabled. The replacement work of the base liner 17 can be performed smoothly and easily.
[0022]
Therefore, according to the pug mill mixer 1 for mixing asphalt mixture according to the embodiment, the mixer arm 8 is formed by a liner made of a wear-resistant material divided into the arm liner 13 and the base liner 17. Of the paddle arm 4 and the bolts 11a and 14a, the mounting bolts 16a, the nuts 11b and 14b, and the fixing nut 16b for attaching the paddle chip 5 and the liner to the paddle arm 4 and attaching the paddle arm 4 to the shaft 3. Abrasion can be effectively prevented, the durability of the mixer arm 8 can be significantly improved, and the wear-resistant parts such as the paddle tip 5 and the liners 13 and 17 can be changed according to the degree of wear. Can be easily replaced individually, making maintenance work easier and reducing costs. It can be.
[0023]
In the pug mill mixer 1 for mixing asphalt mixture according to the embodiment, a mounting plate 17a for mounting the base liner 17 on the mounting base 9 for mounting the arm 10 to the shaft 3 is formed in a flat plate shape. The head of the mounting bolt 16a is exposed on the outer surface 17b, the mounting base 9 is fixed to the shaft 3 together with the mounting plate 17a, and the lower end 13d of the arm liner 13 is brought into contact with the outer surface 17b. Instead of this, as shown in FIGS. 9 and 10, the mounting plate 17c for mounting the protective plate 17 to the mounting base 9 is made thicker, and the mounting bolt 17 A hole 17d into which the head of the mounting bolt 16a is immersed is formed so that the head of the mounting bolt 16a is not exposed from the outer surface 17b. Wherein forming a groove 17e extending along the front face 10b of the arm portion 10 to 7b, the lower end 13d of the arm liner 13 may be fitted into the groove 17e. In this way, the wear of the head of the mounting bolt 16a can be more reliably prevented, and the positioning and fixing of the arm liner 13 to the arm portion 10 can be further ensured.
[0024]
Further, a case where the pug mill mixer for asphalt mixture mixing according to the embodiment is installed in an asphalt plant, and is applied to a case where a dry aggregate and an asphalt melt are mixed to produce an asphalt mixture is applied. However, the present invention is not limited to this, and is used in a recycling plant or a road surface regenerator to mix asphalt pavement waste generated by agitating a pavement road with an asphalt mixture and spread it on the road. The present invention can be applied to a recycled asphalt mixture to be used.
[0025]
【The invention's effect】
As described above, the present invention has the following excellent effects.
According to the pug mill mixer for asphalt mixture mixing according to claim 1, the paddle chip is detachably fixed to the paddle arm at a portion on the leading side in the rotational movement direction of the chip mounting portion for fixing the paddle chip. Since the protection plate portion that covers the bolt and the nut is provided so as to protrude on the opposite side to the paddle chip, the bolt and the nut can be effectively prevented from being worn, and the paddle chip can be prevented from falling off from the paddle arm. The paddle tip can be surely prevented, and the replacement of the paddle tip can be performed smoothly and easily.
[0026]
According to the pug mill mixer for mixing asphalt mixture according to claim 2, a liner made of a wear-resistant material is detachably attached to the paddle arm on the front surface which is the leading side in the rotational movement direction with bolts and nuts. Therefore, the wear of the paddle arm can be prevented by the liner, and the durability of the paddle arm can be significantly improved.
[0027]
According to the pug mill mixer for mixing asphalt mixture according to the third aspect, in addition to the effect according to the first aspect, the effect according to the second aspect can be reliably achieved.
[0028]
According to the pug mill mixer for asphalt mixture mixing according to claim 4, the liner is divided into an arm liner attached to the arm portion of the paddle arm and a base liner attached to the attachment base of the paddle arm to the shaft, In the arm liner, a protection plate portion for covering a bolt for mounting the arm liner to the paddle arm and a nut is provided at a portion which is a leading side in a rotational movement direction of the paddle arm so as to protrude to the rear side of the paddle arm. As a result, the wear of the bolts and nuts can be effectively prevented, and each liner can be individually replaced according to the state of wear thereof, so that maintenance work is simplified and the cost is reduced. can do.
[0029]
According to the pug mill mixer for asphalt mixture mixing according to claim 5, the arm liner has both ends in the axial direction of the paddle arm, the inner end in the axial direction of the paddle arm of the protection plate portion of the paddle arm, Since the base liner is provided in contact with the mounting portion with respect to the mounting base, the arm liner is securely positioned with respect to the paddle arm, and even one bolt or nut can be securely mounted without loosening. Can be.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a pug mill mixer for mixing an asphalt mixture according to an embodiment of the present invention.
FIG. 2 is a front view of a mixer arm in the pug mill mixer for mixing asphalt mixture according to one embodiment of the present invention.
FIG. 3 is a view taken in the direction of arrow A in FIG. 2;
FIG. 4 is a view taken in the direction of arrow B in FIG. 3;
FIG. 5 is a view as viewed in the direction of arrow C in FIG. 4;
FIG. 6 is a sectional view taken along line DD of FIG. 4;
FIG. 7 is a sectional view taken along the line EE of FIG. 4;
FIG. 8 is a perspective view of a mixer arm in the pug mill mixer for mixing asphalt mixture according to one embodiment of the present invention.
FIG. 9 is a plan view showing another example of the base liner attached to the attachment base of the paddle arm to the shaft.
FIG. 10 is a sectional view taken along line FF of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pug mill mixer 2 Mixer casing 3 Shaft 4 Paddle arm 5 Paddle tip 8 Mixer arm 9 Mounting base 9d Side 10 Arm 10b Front 10c, 13b Leading end 11a, 14a Bolt 11b, 14b Nut 12, 15 Protection plate 13 Arm liner 16a Mounting bolt (bolt)
16b fixing nut (nut)
17 Base liner

Claims (5)

A plurality of paddle arms are attached to the outer periphery of a shaft rotatably provided in a mixer casing in a diametric direction, and paddle chips are fixed to a chip mounting portion of the paddle arm, and the shaft is rotated by a driving means. In a pug mill mixer to stir the asphalt mixture in the mixer casing,
In the paddle arm, a protection plate portion covering a bolt and a nut for detachably fixing the paddle chip is provided on a portion which is a leading side in a rotational movement direction of a chip mounting portion for fixing the paddle chip, opposite to the paddle chip. A pug mill mixer for mixing an asphalt mixture, which is provided so as to protrude to the side. A plurality of paddle arms are attached to the outer periphery of a shaft rotatably provided in a mixer casing in a diametric direction, and paddle chips are fixed to a chip mounting portion of the paddle arm, and the shaft is rotated by a driving means. In a pug mill mixer to stir the asphalt mixture in the mixer casing,
A pug mill mixer for asphalt mixture mixing, characterized in that a liner made of an abrasion-resistant material is detachably attached to the paddle arm with a bolt and a nut on a front surface which is a leading side in the rotational movement direction. . The asphalt mixture according to claim 1, wherein a liner made of an abrasion-resistant material is detachably attached to the paddle arm with a bolt and a nut on a front surface that is a leading side in the rotational movement direction. Pug mill mixer for mixing. The liner is divided into an arm liner attached to an arm portion of the paddle arm and a base liner attached to a base attached to the shaft of the paddle arm, and the arm liner has a rotational movement direction of the paddle arm. The pug mill for asphalt mixture mixing according to claim 2 or 3, wherein a protection plate portion covering the bolt and the nut is provided so as to protrude from a rear side of the paddle arm on a portion to be a leading side. mixer. The arm liner is configured such that both end portions of the paddle arm in the axial direction are brought into contact with the inner end portion of the protection plate portion of the paddle arm in the axial direction of the paddle arm and the mounting portion of the base liner to the mounting base. The pug mill mixer for mixing asphalt mixtures according to claim 4, wherein the pug mill mixer is provided.

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