JP2010201835A - Biaxial mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biaxial mixer which develops a conventional biaxial mixer to further improve kneading performance, and enables the more efficient and suitable kneading than a conventional biaxial mixer. <P>SOLUTION: The left end of a first kneading shaft 3 and the right end of a second kneading shaft 3' are provided with two-strip spiral blades 5, respectively, which have bilaterally symmetric shapes, and feed out materials in a kneading tank 2 continuously in directions of the kneading shafts 3, 3' rotating so that a rotating track meet the inner wall of the kneading tank 2. The spiral blades 5 of the first kneading shaft 3 are formed from the left end toward the right end and the spiral blades 5 of the second kneading shaft 3' from the right end toward the left end extending to the utmost limit not to interpose mutually. On the other hand, the right end of the first kneading shaft 3 and the left end of the second kneading shaft 3' are provided with short return blades 7, respectively, returning the materials fed out of the spiral blades 5 to the other adjacent kneading shaft 3, 3' sides. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a mixer that stirs and kneads various materials, and more particularly to a forced kneading mixer having a biaxial kneading shaft.

  The biaxial mixer is conventionally suitably used for forcibly stirring and kneading various materials, and for example, is often used in a batcher plant for producing ready-mixed concrete. In this biaxial mixer, two parallel kneading shafts rotating in opposite directions are horizontally arranged in a kneading tank, and an arm having feed blades attached to the kneading shaft is 45 ° to 90 ° at predetermined intervals in the axial direction. The structure is arranged so as to be shifted in a spiral manner. The material is moved across the entire area of the kneading tank while being fed up and down and left and right by feed blades having a rake angle and a soot angle, and various materials are kneaded by the screw effect and shearing action.

  By the way, in such a biaxial mixer, it has become a very general configuration to arrange the feed blades rotating along the inner wall of the kneading tank in a single spiral around the kneading axis. As shown in FIG. 7, a patent application has been filed for a biaxial mixer 101 in which feed blades 105 that rotate along the inner wall of the kneading tank 102 are arranged in two spirals around the kneading shafts 103 and 103 ′ (Patent Literature). 1). In FIG. 7, 104 is a bearing that rotatably supports the kneading shafts 103 and 103 ′, 106 is an arm that fixes the feed blade 105 to the kneading shafts 103 and 103 ′, and 107 is a material sent from the feed blade 105. Return blades that cut back to the adjacent kneading shafts 103 and 103 ', 108 is a driving motor, 109 is a reduction gear that decelerates the driving force from the driving motor 108 and transmits it to the kneading shafts 103 and 103', and 110 is the left and right This is a coupling mechanism that synchronizes the rotational speeds of the kneading shafts 103 and 103 '. With this biaxial mixer 101, the kneading shafts 103 and 103 'can make a kneading action twice with respect to the material inside the kneading tank 102 while the kneading shafts 103 and 103' make one rotation. Uniform kneading is possible over time.

  Further, instead of each feed blade 105 and each return blade 107 of the biaxial mixer 101, two spiral feed blades 205 and return blades 207 as shown in FIG. 8 are arranged around the kneading shafts 203 and 203 ′. A patent application has also been filed for the two-shaft mixer 201 formed (Patent Document 2). The basic structure of the biaxial mixer 201 is substantially the same as that of the biaxial mixer 101 in FIG. 7. In FIG. 8, 202 is a kneading tank, 204 is a bearing, 206 is an arm, 208 is a drive motor, Reference numeral 209 denotes a reduction gear, and reference numeral 210 denotes a coupling mechanism. Then, with this biaxial mixer 201, as with the biaxial mixer 101, the kneading shafts 203 and 203 ′ are mixed twice with the kneading tank 202 while the kneading shafts 203 and 203 ′ rotate once. In addition, the spiral feed blade 205 and the return blade 207 having a length ratio in the kneading axis direction of about 5: 5 to 7: 3 can quickly feed or cut the material in the kneading axis direction. And can be stirred and kneaded extremely efficiently.

JP-A-11-221818 JP 2007-152190 A

  However, in batcher plants and the like equipped with such a twin-shaft mixer, a mixer having higher kneading performance is always desired in order to improve manufacturing capacity and product quality.

  In view of the above-mentioned points, the present invention provides a twin-screw mixer that improves the kneading performance by improving the conventional twin-screw mixer and can perform kneading more efficiently and more suitably than the conventional twin-screw mixer. Is an issue.

  In order to solve the above problems, in the biaxial mixer according to claim 1 according to the present invention, two parallel kneading shafts rotating in the opposite directions are horizontally disposed in the kneading tank, and the first kneading shaft is arranged. The left end of the second kneading shaft and the right end of the second kneading shaft are symmetrically shaped so that the rotation trajectory rotates along the inner wall of the kneading tank and continuously feeds the material in the kneading tank in the kneading axis direction. Each of the spiral blades of the first kneading shaft extends from the left end to the right end, and the spiral blade of the second kneading shaft extends from the right end to the left end so that they do not interfere with each other. On the other hand, on the right end portion of the first kneading shaft and the left end portion of the second kneading shaft, short return blades for turning back the material fed from the spiral blade to the other kneading shaft side, respectively. It is characterized by having prepared.

  Further, in the biaxial mixer according to claim 2, the kneading shaft between the spiral blade and the return blade is provided with a short feed blade whose phase is shifted so as not to interfere with the spiral blade of the adjacent kneading shaft. It is characterized by.

  The biaxial mixer according to claim 3 is characterized in that a short feed blade is provided at an opposite position across the kneading shaft of the return blade.

  Further, in the biaxial mixer according to claim 4, the ratio of the spiral blade or the material feeding region by the spiral blade and the short feeding blade to the material turning region by the return blade is about 9: 1. It is characterized by.

  According to the biaxial mixer of the first aspect of the present invention, the two parallel kneading shafts rotating in the opposite directions are horizontally disposed in the kneading tank, the left end portion of the first kneading shaft, and the second The right end portion of the kneading shaft is provided with two spiral blades that are symmetrically shaped and rotated so that the rotation trajectory is along the inner wall of the kneading tank and continuously feed the material in the kneading tank in the kneading axis direction, The spiral blade of the first kneading shaft is formed from the left end portion toward the right end portion, and the spiral blade of the second kneading shaft is formed from the right end portion toward the left end portion, extending to the limit so as not to interfere with each other. Since the right end portion of one kneading shaft and the left end portion of the second kneading shaft are each provided with a short return blade for turning back the material fed from the spiral blade to the other kneading shaft side, Effectively increasing the amount of material delivered to increase the material circulation speed It can be, to allow a suitable kneading in a very short time.

  Further, according to the biaxial mixer according to claim 2, the kneading shaft between the spiral blade and the return blade is provided with a short feed blade whose phase is shifted so as not to interfere with the spiral blade of the adjacent kneading shaft. Therefore, even if the spiral blades are further extended, interference between the blades will occur, and the feed amount of the material in the kneading tank is effectively increased while reliably avoiding interference by the short feed blades. The circulation speed can be increased, and suitable kneading can be performed in a very short time.

  Further, according to the biaxial mixer of claim 3, since the short feed blade is provided at the opposite position across the kneading shaft of the return blade, the amount of the material in the kneading tank can be increased more effectively. The circulation speed of the material can be increased, and suitable kneading can be performed in an extremely short time.

  According to the biaxial mixer of claim 4, the ratio of the spiral blade or the material feed region by the spiral blade and the short feed blade to the material turn-back region by the return blade is about 9: 1. Therefore, it is possible to effectively increase the feed rate of the material in the kneading tank and increase the circulation speed of the material, thereby enabling suitable kneading in an extremely short time.

1 is a partially cutaway front view showing an embodiment of a biaxial mixer according to the present invention. It is a top view of FIG. FIG. 2 is a perspective view in which a part of FIG. 1 is cut away and omitted. It is a partially notched front view which shows another Example of the biaxial mixer which concerns on this invention. FIG. 5 is a plan view of FIG. 4. FIG. 5 is a perspective view in which a part of FIG. 4 is cut away and omitted. It is a figure equivalent to FIG. 2 which shows a prior art example. It is a figure equivalent to FIG. 2 which shows another prior art example.

  In the biaxial mixer according to the present invention, as shown in FIGS. 1 to 3, the left end portion of the first kneading shaft 3 among the two parallel kneading shafts 3, 3 ′ (on the drawing of FIG. 2, The left end of the lower kneading shaft) and the right end of the second kneading shaft 3 '(the right end of the upper kneading shaft in FIG. 2) are symmetrical and have a rotational trajectory of the kneading tank 2. The spiral blade 5 of the first kneading shaft 3 is provided with two spiral blades 5 that rotate along the inner wall and continuously feed the material in the kneading tank 2 in the direction of the kneading shafts 3 and 3 '. The spiral blades 5 of the second kneading shaft 3 'are formed so as to extend from the right end portion to the right end portion to the limit length that does not cause mutual interference.

  Further, a short barb for turning back the material fed from the spiral blade 5 to the other kneading shaft 3, 3 'side at the right end of the first kneading shaft 3 and the left end of the second kneading shaft 3'. One blade 7 is provided, and one short feed blade 11 is provided at an opposite position across the kneading shafts 3, 3 ′ of the return blade 7. The ratio (X: Y) of the material feeding area X by the spiral blade 5 and the short feeding blade 11 and the material turning area Y by the return blade 7 is about 9: 1. The ratio occupied by the feed region X is higher than the ratio of about 5: 5 to 7: 3 of the biaxial mixer described in Document 2.

  For example, when producing ready-mixed concrete with the biaxial mixer 1, various concrete materials such as gravel, sand, cement, admixture, and water are put into the kneading tank 2 by a predetermined amount for driving. The motor 8 rotates the two kneading shafts 3 and 3 'in opposite directions at a predetermined speed. At this time, while rotating each kneading shaft 3, 3 ′, the kneading tank 2 is kneaded twice with various materials staying inside the kneading tank 2 by the two spiral blades 5 disposed on the kneading shaft 3, 3 ′. The material circulation speed can be increased by effectively increasing the feed amount of the material in the kneading tank 2 by the spiral blade 5 extended to the limit while providing the action and the short feed blade 11 provided at the opposite position of the return blade. The stirring and kneading are performed extremely efficiently and suitably.

  In this way, the spiral blade that enables continuous and smooth feeding of the material is formed so as to extend to the limit length where interference between the blades is barely avoided, so that the kneaded material is fed, sheared, turned back, etc. It becomes possible to carry out more continuously and rapidly, and kneading materials such as high-quality ready-mixed concrete can be produced in a short time by further increasing the kneading efficiency.

  An embodiment of the present invention will be described below with reference to FIGS.

  In the figure, reference numeral 1 denotes a biaxial mixer for producing a desired kneaded material by stirring and kneading various kneaded materials, and two parallel kneading shafts 3, 3 'are provided in a kneading tank 2 composed of two twin cylinders. Is horizontally supported and is rotatably supported by a bearing 4 and a driving device fixed to the kneading tank 2.

  Of the kneading shafts 3 and 3 ', the left end portion of the first kneading shaft 3 (the left end portion of the lower kneading shaft in the drawing of FIG. 2) and the right end portion of the second kneading shaft 3' (the drawing of FIG. 2). On the upper and upper kneading shafts), the material in the kneading tank 2 is continuously moved in the direction of the kneading shafts 3 and 3 ′ by rotating so that the left and right symmetrical shapes and the rotation locus are along the inner wall of the kneading tank 2. The spiral blades 5 of the first kneading shaft 3 are respectively provided from the left end portion toward the right end portion in the drawing of FIG. The 3 ′ spiral blade 5 is formed so as to extend from the right end to the left end so as not to interfere with each other in the drawing of FIG. 2, and around the kneading shafts 3, 3 ′. It has a shape that circulates about 180 °.

  Further, the right end portion of the first kneading shaft 3 (the right end portion of the lower kneading shaft in the drawing of FIG. 2) and the left end portion of the second kneading shaft 3 ′ (the left end of the upper kneading shaft in the drawing of FIG. 2). Part), like the spiral blade 5, rotates along the inner wall of the kneading tank 2, and sequentially returns the material fed by the spiral blade 5 to the other kneading shaft 3, 3 ′ side. 7 are provided one by one via the arm 6, while one short feed blade 11 is provided at the opposite position across the kneading shafts 3, 3 ′ of the return blade 7.

  The short feed blade 11 will be described with reference to the first kneading shaft 3 in FIG. 2. The left end position of the feed blade 11 with respect to the length direction of the kneading shaft 3 is made to substantially coincide with the right end position of the spiral blade 5. While the material fed from the spiral blade 5 is sheared so that it can be fed almost continuously to the vicinity of the right end of the kneading shaft 3, the position of the right end of the feeding blade 11 is slightly separated from the inner wall of the kneading tank 2. The material fed to the vicinity of the right end of the kneading shaft 3 is smoothly turned back to the other kneading shaft 3, 3 ′ side by the rotating return blade 7 that continues to rotate.

  In the figure, 8 is a drive motor for the kneading shafts 3 and 3 ', 9 is a speed reducer that transmits the driving force to the kneading shafts 3 and 3' while decelerating the rotational speed of the drive motor 8. This is a coupling mechanism that synchronizes the rotational speeds of the kneading shafts 3, 3 '. Further, in the illustrated example, the discharge gate installed at the bottom center of the kneading tank 2 is omitted.

  As shown in FIG. 2, the material feed region X in the kneading tank 2 formed by the spiral blade 5 and the short feed blade 11 formed so as to extend as long as possible, and the short return blade 7 The ratio of the formed material to the cut-back region Y (X: Y) is about 9: 1, and the conventional biaxial mixer 201 as shown in FIG. The ratio (X: Y) of the material feed region X to the material turning region Y formed by the spiral shaped return blade 207 is about 5: 5 to 7: 3, whereas the material feed region X The ratio of the material is increased to suppress the amount of material turning back relative to the amount of material delivered, thereby improving the material circulation speed in the kneading tank 2.

  Then, when producing ready-mixed concrete by stirring and kneading various concrete materials such as gravel, sand, cement, admixture, and water in the above-described twin-screw mixer 1, While the materials are sequentially put into the kneading tank 2, the driving motor 8 is driven to rotate the two kneading shafts 3, 3 'in opposite directions at a predetermined speed. At this time, while each kneading shaft 3, 3 ′ makes one rotation, the kneading tank 2 is provided by two spiral blades 5 respectively provided at the left end portion of the first kneading shaft 3 and the right end portion of the second kneading shaft 3 ′. Kneading with the spiral blade 5 formed so as to extend to the limit and the short feed blade 11 provided at the opposite position of the return blade 7 while giving the kneading action twice to various materials staying inside. The amount of the material in the tank 2 is effectively increased, and the material is quickly delivered along the kneading shafts 3 and 3 '.

  Then, the material fed to the right end portion of the first kneading shaft 3 and the left end portion of the second kneading shaft 3 ′ is sequentially fed to the other kneading shaft 3, 3 ′ side by the short return blade 7. Then, the mixture is efficiently and suitably stirred and kneaded by quickly circulating in the kneading tank 2.

  In this way, the two spiral blades provided for one kneading shaft are formed so as to extend long enough to avoid interference with the adjacent kneading shaft blades, so that the kneaded material is fed out, sheared, turned back, etc. Can be continuously and quickly performed, and the retention of the kneaded material in the kneading tank can be reduced as much as possible, and efficient stirring and kneading can be performed to produce a high-quality kneaded material in an extremely short time. it can.

  4 to 6 show another embodiment of the present invention. The same components as those of the mixer described in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  The mixer 1 ′ shown in FIGS. 4 to 6 is a type of mixer having a larger kneading tank 2 size than the mixer 1 shown in FIGS. 1 to 3, and kneading as the kneading tank 2 becomes larger. The shafts 3 and 3 'are formed long.

  Therefore, as in the case of the mixer 1 of the first embodiment, the spiral blade 5 of the first kneading shaft 3 (the lower kneading shaft on the drawing in FIG. 5) is moved from the left end portion to the right end portion on the drawing in FIG. The spiral blades 5 of the second kneading shaft 3 '(upper kneading shaft on the drawing of FIG. 5) are limited so that they do not interfere with each other from the right end to the left end on the drawing of FIG. The kneading shafts 3, 3 ′ are formed around the kneading shafts 3, 3 ′, and the shape of the kneading shafts 3, 3 ′ is long. Since a large gap is generated between them, a pair of short feed blades 12 are provided at opposite positions with the kneading shafts 3 and 3 'sandwiched between the kneading shafts 3 and 3'. The position where the short feed blade 12 is attached is a position where if the spiral blade 5 is stretched as it is, it interferes with the blades of the adjacent kneading shafts 3 and 3 ', so the phase is slightly shifted from that of the spiral blade 5. Attached. In this embodiment, a pair of return blades 7 are provided at opposite positions across the kneading shafts 3 and 3 ', and a feed blade is provided at a position opposite to the return blades 7 as in the mixer 1 of the first embodiment. I have not done it.

  As shown in FIG. 5, the material feed region X in the kneading tank 2 formed by the spiral blade 5 and the short feed blade 12 formed so as to extend as long as possible, and the short return blade 7 The ratio (X: Y) of the formed material to the cut-back region Y is about 9: 1 as in the case of the mixer 1 of the first embodiment, and the material is fed out at the same rate as the mixer 1. The structure is to be performed.

  In addition, in the mixer 1 of Example 1, although the feed blade 11 is provided in the opposite position on both sides of the kneading shafts 3 and 3 'of the return blade 7, another return blade 7 may be attached. In the mixer 1 ′ of the second embodiment, a pair of return blades 7 are provided, but a single return blade 7 may be provided and a feed blade may be provided instead of the return blade 7 at the opposite position. At this time, the ratio (X: Y) of the material feeding region X and the material turning-back region Y in the kneading tank 2 is slightly changed, but is about 9: 1, so that the material feeding amount is sufficient. It can be expected to perform stirring and kneading efficiently while being maintained.

  Further, the angle at which the spiral blade 5 of the mixer 1 of the first embodiment circulates around the kneading shafts 3 and 3 ′ is about 180 °, whereas the spiral blade 5 of the mixer 1 ′ of the second embodiment has the kneading shaft 3. The angle of circling around 3 ′ is about 225 °, and there is an opening of about 45 ° between them, but the spiral blade 5 of the mixer 1 of Example 1 circulates around the kneading shafts 3, 3 ′. This is because the starting point at which the spiral blade 5 of the mixer 1 ′ of Example 2 starts rotating around the kneading shafts 3, 3 ′ is shifted from the starting point by about 45 ° (lower side in FIG. 2). Whereas the left end of the longer spiral blade 5 provided on the kneading shaft 3 starts rotating from a position rotated about 45 ° from the position directly below the kneading shaft 3, the lower kneading in FIG. The left end portion of the longer spiral blade 5 provided on the shaft 3 starts rotating from the position directly below the kneading shaft 3). The difference between the lengths of the shafts 3 and 3 'is somewhat eliminated.

DESCRIPTION OF SYMBOLS 1 ... Biaxial mixer 2 ... Kneading tank 3, 3 '... Kneading shaft 5 ... Spiral blade 6 ... Arm 7 ... Return blade 8 ... Drive motor 9 ... Reduction gear 11 ... Feed blade (short length)

Claims (4)

  Two parallel kneading shafts rotating in opposite directions are horizontally arranged in the kneading tank, and the left end portion of the first kneading shaft and the right end portion of the second kneading shaft are symmetrical and have a rotational locus. Each of the spiral blades of the first kneading shaft is rotated from the left end portion toward the right end portion. The spiral blade of the second kneading shaft is formed to extend from the right end portion to the left end portion to the limit so as not to interfere with each other, while the right end portion of the first kneading shaft and the left end portion of the second kneading shaft Are each provided with a short return blade for turning back the material fed from the spiral blade to the other kneading shaft side.   2. A twin screw mixer according to claim 1, wherein a short feed blade whose phase is shifted so as not to interfere with the spiral blade of the adjacent kneading shaft is provided on the kneading shaft between the spiral blade and the return blade. .   The biaxial mixer according to claim 1 or 2, further comprising a short feed blade at an opposite position across the kneading shaft of the return blade.   4. The ratio of the spiral blade or the material feed region by the spiral blade and the short feed blade to the material turn-back region by the return blade is about 9: 1. Axial mixer.

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