JP2007210284A - Single-shaft type mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single-shaft type mixer showing a more improved mixing performance by improving a conventional single-shaft type mixer. <P>SOLUTION: The mixer has the first spiral blade 10 comprising a sending blade 8 extending along an inner wall of a mixing vessel 2 from a base end part 3a of a mixing shaft 3 as a starting point to a position 3d a little bit near from the central part 3c to the tip end part as a terminal point to send out a material and a raising blade 9 extending from a terminal point of the sending blade 8 as a starting point to a tip end part 3e of the mixing shaft 3 as a terminal point to raise the material around the mixing shaft 3; and the second spiral blade 13 located on the opposite side of the mixing shaft 3 and comprising a cutting-back blade 11 having a shape reversely asymmetrical to the first spiral blade 10 and a raising blade 12 raising and mixing the material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mixer that stirs and mixes various materials, and more particularly to a forced kneading mixer having a single mixing axis.

A single-shaft mixer has been conventionally used to forcibly stir and mix various materials. For example, a single-shaft mixer is also used for a concrete mixer for producing ready-mixed concrete. As this uniaxial mixer, for example, a pair of mixing blades formed in a spiral shape that supports a single mixing shaft in a mixing tank so as to be substantially horizontal and rotatable, and extends from one end of the mixing shaft to the central portion. Are provided in reverse symmetry with respect to the mixing axis (Patent Documents 1, 2, 3). Then, when the mixing shaft is rotated at a predetermined speed by such a single-shaft mixer, the material is moved toward the center of the mixing tank while stirring the material by the spiral mixing blade, and the shearing action and screw effect by the mixing blade Is mixing raw concrete.
JP 59-20616 A Japanese Patent Laid-Open No. 11-221820 JP 2000-43025 A

  By the way, in a concrete plant equipped with a concrete mixer as described above, there are many cases where the amount of ready-mixed concrete is concentrated in a certain time zone, and flexibly responds to such a temporary increase in the amount of shipment. There is always a need for a mixer with excellent mixing performance.

  An object of the present invention is to provide a uniaxial mixer with improved mixing performance by improving the conventional uniaxial mixer in view of the above points.

  In order to solve the above-mentioned problems, the present inventors have made various improvements to the blades of a single-shaft mixer, and have confirmed the mixing performance by experiments, resulting in the present invention. That is, the single-shaft mixer according to the first aspect of the present invention supports a single mixing shaft in the mixing tank so that the mixing shaft can rotate substantially horizontally, and the mixing shaft rotates on the base end side of the mixing shaft. While having a driving device to be driven, a feed blade for feeding material along the inner wall of the mixing tank with a base end portion of the mixing shaft as a start point and a position closer to a tip portion of a predetermined length from the center portion as an end point, and an end point of the feed blade And a lifting blade for lifting and stirring the material around the mixing axis starting from the tip of the mixing shaft, and the first spiral blade on the opposite side of the mixing shaft. It is characterized in that it has a second spiral blade comprising a return blade for material turning that is inversely symmetrical in shape and a lifting blade for material lifting and stirring.

  The uniaxial mixer according to claim 2 has a length ratio in the mixing axis direction of the feed blade and the lifting blade of the first spiral blade and the return blade and the lifting blade of the second spiral blade of about 6 in both. : 4 to 7: 3.

  The uniaxial mixer according to claim 3, wherein the phase of the mixing shaft is shifted by a predetermined angle from the mounting position of the first and second spiral blades, and the base end portion of the mixing shaft is set as the starting point and the center portion is set as the end point. As a second feed blade for feeding the material formed in a spiral shape along the inner wall of the mixing tank, and on the opposite side of the mixing shaft, the tip of the mixing shaft is the starting point and is shaped like the second feeding blade. It is characterized by having a second return blade for material reversal that is reversely symmetric.

  According to the single-shaft mixer according to the first aspect of the present invention, one mixing shaft is rotatably supported substantially horizontally in the mixing tank, and the mixing shaft is rotated on the base end side of the mixing shaft. While having a driving device to be driven, a feed blade for feeding material along the inner wall of the mixing tank with a base end portion of the mixing shaft as a start point and a position closer to a tip portion of a predetermined length from the center portion, and an end point of the feed blade A first spiral blade comprising a lifting blade for lifting and stirring the material around the mixing axis starting from the tip of the mixing shaft and an end point of the mixing shaft, and the first spiral blade on the opposite side of the mixing shaft Because it has a second spiral blade consisting of a reverse blade for material reversal and a lift blade for material lifting and stirring that are inversely symmetric in shape, it is inside the mixing tank due to the shearing action by the feed blade and the return blade and the screw effect. Circulate and hold materials It is possible to move the material to dynamically mixing tank by shear and stirring action by lifting the mixing axis of the material in the vicinity of the mixing vessel opposite ends by raising the blade, it is possible to increase the mixing performance.

  According to the uniaxial mixer according to claim 2 of the present invention, the length in the mixing axis direction of the feed blade and the lifting blade in the first spiral blade, and the return blade and the lifting blade in the second spiral blade. Although both ratios were about 6: 4 to 7: 3, it was confirmed by experiments that the mixing efficiency at this length ratio was more effective.

  According to the uniaxial mixer according to claim 3 of the present invention, the mixing shaft is shifted in phase by a predetermined angle from the mounting position of the first and second spiral blades, and the base end of the mixing shaft is set as the starting point. And a second feeding blade for feeding the material formed in a spiral shape along the inner wall of the mixing tank with the center as an end point, and on the opposite side of the mixing shaft, the tip of the mixing shaft is the starting point, and the second The material is equipped with a second return blade for turning the material that is inversely symmetrical to the feed blade, so that the material can be moved more dynamically by improving the material feeding and turning ability, further improving the mixing performance. be able to.

  In the single-shaft mixer according to the present invention, one mixing shaft is supported horizontally and freely in the mixing tank, and the mixing shaft is driven to rotate on the base end side (one end side) of the mixing shaft. A drive device is provided. Further, the mixing shaft has a feed end blade for feeding a material formed in a spiral shape along the inner wall of the mixing tank, with its base end as a starting point and a position slightly closer to the tip from the center as an end point. And a first spiral blade comprising a lifting blade for material lifting and stirring formed in a spiral shape around the mixing axis with the end point of the feed blade as the starting point and the tip of the mixing shaft as the end point. Further, on the opposite side of the mixing shaft, there is provided a second spiral blade made up of a return blade for turning back the material and a lift blade for lifting and stirring the material, which is inversely symmetrical in shape with the first spiral blade.

  The length ratio in the mixing axis direction of the feed blade and lifting blade in the first spiral blade and the return blade and lifting blade in the second spiral blade is preferably about 6: 4 to 7: 3. . Thus, if the length of the feed blade and the return blade is more than half of the mixing shaft, the material movement due to the screw effect of the feed blade and the return blade can be increased as much as possible, and it is effective for mixing. At the same time, considering that the effect of lifting and stirring the material around the mixing axis near both ends of the mixing tank by lifting blades can be exhibited as it is, mixing performance is improved if the length ratio is about 6: 4 to 7: 3 Experiments have confirmed that favorable results are obtained.

  In addition, the mixing performance can be sufficiently improved by mixing with the first and second spiral blades, but in order to achieve more dynamic mixing, the phase of the mixing shaft from the mounting position of the first and second spiral blades is increased. Is provided with a second feed blade for feeding material formed in a spiral shape along the inner wall of the mixing tank with the base end of the mixing shaft as the start point and the center as the end point. In addition, a second return blade for material turning is provided on the opposite side of the mixing shaft, starting from the tip of the mixing shaft and having a shape inversely symmetrical to the second feed blade.

  Then, for example, when producing ready-mixed concrete with the uniaxial mixer, various concrete materials such as gravel, sand, cement, admixture, and water are sequentially put into a mixing tank in a predetermined amount and mixed by a driving device. When the shaft is rotated at a predetermined speed, the material is sheared by the feed blades and the return blades of the first and second spiral blades, causing the material to rapidly circulate in the mixing tank due to the screw effect, and to lift the shaft. The blades cause shearing and stirring by lifting the material around the mixing axis near both ends of the mixing tank. As a result, the material can be dynamically moved in the mixing tank, and efficient mixing can be performed. Further, as described above, in the case of having the second feeding blade and the second return blade, the material feeding and cutting ability is further improved, so that the material can be moved more dynamically. As a result, the mixing performance can be further enhanced.

  Thus, according to the uniaxial mixer of the present invention, the blades of the conventional mixer are improved and the material is moved more dynamically in the mixing tank, so that the mixing performance can be improved as compared with the conventional mixer. .

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

  In the figure, reference numeral 1 denotes a uniaxial mixer that stirs and mixes various mixed materials to produce a desired mixture, and is placed in a substantially cylindrical mixing tank 2 having an input port at the top and a discharge port at the bottom. The mixing shaft 3 of the book is penetrated substantially horizontally and is rotatably supported by a bearing 4 fixed to the mixing tank 2. Reference numeral 5 denotes a drive device that rotationally drives the mixing shaft 3, and is connected to the base end portion 3 a side of the mixing shaft 3 via a speed reducer 6.

  The mixing shaft 3 is spirally arranged in this order at its proximal end 3a, a position 3b slightly closer to the proximal end from the central portion 3c, a position 3d slightly closer to the distal end from the central portion 3c, and a distal end 3e. The arms 7a, 7b, 7d, and 7e for fixing the blades are fixed.

  Then, with the arm 7a as the starting point and the arm 7d as the end point, a spiral shape is formed along the inner wall of the mixing tank 2, and the material in the mixing tank 2 is moved from the base end 3a side to the tip end 3e side of the mixing shaft 3 A part of the material sent out from the feed blade 8 in a spiral shape around the axis of the mixing shaft 3 with the arm 7d as the starting point and the arm 7e as the end point. A first spiral blade 10 comprising a lifting blade 9 that lifts and agitates the first spiral blade 10 is provided.

  Further, on the opposite side of the mixing shaft 3, a spiral shape is formed along the inner wall of the mixing tank 2 with the arm 7 e as a starting point and the arm 7 b as an end point. The return blade 11 that turns back from the 3e side to the base end 3a side, and the return blade 11 is formed in a spiral shape around the axis of the mixing shaft 3 with the arm 7b as the starting point and the arm 7a as the end point. A second spiral blade 13 is provided which includes a lifting blade 12 that lifts and stirs a part of the material cut back from the material. As described above, the second spiral blade 13 has a shape that is inversely symmetrical in shape with respect to the first spiral blade 10.

  The length ratios of the feed blade 8 and the lifting blade 9 in the first spiral blade 10 and the return blade 11 and the lifting blade 12 in the second spiral blade 13 in the direction of the mixing axis 3 are both 6: 4 to 7: 3. It is structured to the extent. Thus, if the feed blade 8 and the return blade 11 are at least half the length of the mixing shaft 3, the movement of the material due to the screw effect of the feed blade 8 and the return blade 11 can be increased as much as possible to increase the mixing efficiency. At the same time, the length ratio is determined by considering that the lifting and stirring effect of the material around the mixing shaft 3 near the both ends of the mixing tank 2 by the lifting blades 9 and 12 can be sufficiently exhibited.

  Further, as can be seen from the drawings, among the materials sent out by the feed blades 8 and the materials turned back by the return blades 11, most of them flow into the gaps on the outer edges of the lifting blades 9 and 12, but they are mixed. A part of the material flowing around the shaft 3 rides on the lifting blades 9 and 12 and is lifted as it is to be effectively stirred.

  The length ratio of the feed blade 8 and lifting blade 9 in the first spiral blade 10 and the return blade 11 and lifting blade 12 in the second spiral blade 13 in the direction of the mixing axis 3 is preferably 6: 4-7. : It suffices to be within the range of about 3, but according to experiments, it has been confirmed that the mixing efficiency is most excellent especially at about 6: 4.

  Further, the arms 14a and 14e are fixed to the base end portion 3a and the tip end portion 3e of the mixing shaft 3 by shifting the phases of the arms 7a and 7e by about 90 degrees, respectively. The arm 14c is fixed in phase with the arm 7e, and the arm 14c 'is fixed in phase with the arm 7a.

  Then, with the arm 14a as the starting point and the arm 14c as the end point, a spiral shape is formed along the inner wall of the mixing tank 2, and the material in the mixing tank 2 is moved from the base end 3a side to the tip end 3e side of the mixing shaft 3 A second feed blade 15 is provided. Further, on the opposite side of the mixing shaft 3, the arm 14e is the starting point and the shape is oppositely symmetrical to the second feed blade 15, that is, the arm 14e is the starting point and the arm 14c 'is the end point. A second return blade 16 is provided which is formed in a spiral shape so as to cut back the material in the mixing tank 2 from the distal end portion 3e side to the proximal end portion 3a side of the mixing shaft 3.

  Thus, in order to feed the material in the mixing tank 2 from the base end 3a side of the mixing shaft 3 to the tip end 3e side, the second feed blade 15 is added in addition to the feed blade 8 of the first spiral blade 10. In addition to providing the second return blade 16 in addition to the return blade 11 of the second spiral blade 13 for turning back from the distal end portion 3e side of the mixing shaft 3 to the proximal end portion 3a side, The feeding and turning back capability is further enhanced, and the material can be dynamically circulated and the mixing efficiency can be improved.

  The length ratio of the second feed blade 15 and the second return blade 16 in the mixing shaft 3 direction is 5: 5, and the length ratio in the mixing shaft 3 direction is 6: 4 to 7: 3. The first spiral blade 10 does not interfere with the feeding blade 8 and the lifting blade 9 and the return spiral 11 and the lifting blade 12 of the second spiral blade 13, and a sufficient gap space is provided between the blades. The material is moved and sheared effectively.

  For example, when producing ready-mixed concrete with the uniaxial mixer 1 configured as described above, various concrete materials measured by a predetermined amount while rotating the mixing shaft 3 at a predetermined speed by the drive device 5 are stored in the mixing tank 2. When the materials are sequentially introduced from the upper introduction port (not shown), the introduced material is subjected to the shearing action by the feed blade 8 and the second feed blade 15 of the spiral blade 10 and the mixing shaft 3 by the screw effect. While being fed from the base end 3a side to the tip end 3e side, the return blade 11 of the spiral blade 13 and the second return blade 16 are similarly subjected to shearing action and mixed in the opposite direction by the screw effect. The shaft 3 is cut back from the distal end portion 3e side to the proximal end portion 3a side. As a result, the material circulates and moves in the mixing tank 2 while being mixed. Further, in the vicinity of both ends of the mixing tank 2, the material is efficiently mixed by lifting and stirring the material around the mixing shaft 3 while applying a shearing action to the material by the lifting blades 9 and 12.

  As described above, according to the uniaxial mixer 1 of the present invention, the first spiral blade 10 and the second spiral blade 13 are provided in the mixing tank 2, and the shearing action and the screw effect by the feed blade 8 and the return blade 16 are provided. Kneading efficiently while dynamically moving the material by the circulating movement of the material in the mixing tank by the lifting and the shearing action and the stirring action by the lifting blades 11 and 12 by the lifting of the material around the mixing axis 3 near the both ends of the mixing tank 2 Can be mixed. Further, if the second feeding blade 15 and the second return blade 16 are provided, the material feeding and cutting ability can be further improved, so that the material can be moved more dynamically. Can also improve the mixing performance.

  In the present embodiment, the case where the uniaxial mixer of the present invention is used for the production of ready-mixed concrete is described. However, the present invention is not particularly limited thereto, and various other viscous materials and powders are mixed. Even in such a case, it can be suitably employed.

1 is a partially cutaway front view showing an embodiment of a single-shaft mixer according to the present invention. It is a top view of FIG. It is AA sectional drawing of FIG. It is the principal part perspective view which notched and omitted a part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Uniaxial mixer 2 ... Mixing tank 3 ... Mixing shaft 5 ... Drive device 8 ... Feeding blade 9 ... Lifting blade 10 ... 1st spiral blade 11 ... Return blade 12 ... Lifting blade 13 ... 2nd spiral blade 15 ... 1st 2 feed blades 16 ... second return blade

Claims (3)

  One mixing shaft is supported in the mixing tank so as to be rotatable substantially horizontally, and a drive device for rotating the mixing shaft is provided on the base end side of the mixing shaft, while the base end portion of the mixing shaft is the starting point. And a feed blade for feeding the material along the inner wall of the mixing tank with the position near the tip of the predetermined length from the center as the end point, and the end of the feed blade as the start point and the end of the mixing shaft as the end point around the mixing axis A first spiral blade composed of a lifting blade for lifting and agitating the material, and a return blade for turning back the material which is oppositely symmetrical to the first spiral blade on the opposite side of the mixing axis; A single-shaft mixer comprising a second spiral blade comprising a lifting blade for lifting and stirring.   The length ratio in the mixing axis direction of the feed blade and the lifting blade in the first spiral blade and the return blade and the lifting blade in the second spiral blade are both about 6: 4 to 7: 3. The uniaxial mixer according to claim 1.   A material formed in a spiral shape along the inner wall of the mixing tank with the mixing shaft having a phase shifted by a predetermined angle from the mounting position of the first and second spiral blades, with the base end of the mixing shaft as the starting point and the center as the end point A second feed vane for feeding is provided, and the second side for material reversal is provided on the opposite side of the mixing shaft from the tip of the mixing shaft as a starting point and inversely symmetrical in shape to the second feeding blade. The single-shaft mixer according to claim 1, further comprising a return blade.

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