JP4617248B2 - 2-axis mixer - Google Patents

Description

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

  The biaxial mixer has been favorably employed in the past to forcibly agitate and mix various materials, and is often employed, for example, in a batcher plant for producing ready-mixed concrete. In this biaxial mixer, two mixing shafts that rotate in opposite directions are arranged in parallel in the mixing tank, and the arm with the feed blades attached to each mixing shaft is shifted by 45 to 90 degrees at predetermined intervals in the axial direction. The structure is arranged in a spiral. Then, the material is moved over the entire region of the mixing tank while feeding it up and down and left and right by a feed blade having a rake angle and a soot angle, and various materials are mixed 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 mixing tank in a single spiral around the mixing axis. As shown in FIG. 5, a patent application has been filed for a biaxial mixer 101 for producing ready-mixed concrete, in which feed blades 105 rotating along the inner wall of the mixing tank 102 are arranged in two spirals around the mixing shafts 103 and 103 ′. (Patent Document 1). In FIG. 5, 104 is a bearing that rotatably supports the mixing shafts 103 and 103 ′, 106 is an arm that fixes the feeding blade 105 to the mixing shafts 103 and 103 ′, and 107 is a mixed material fed from the feeding blade 105. , 108 is a driving motor, 109 is a speed reducer that decelerates the driving force from the driving motor 108 and transmits it to the mixing shafts 103 and 103 ′, and 110 is left and right. This is a coupling mechanism for synchronizing the rotation speeds of the mixing shafts 103 and 103 ′. And if it is this biaxial mixer 101, while mixing shaft 103,103 'rotates 1 time, it can give the mixing action twice with respect to the mixed material in the mixing tank 102, and is very short. Uniform mixing is possible with the mixing time.
JP-A-11-221818

  However, if a large number of feed blades and return blades are arranged on the mixing shaft as described above, the blade structure becomes complicated and the cost is increased, and depending on the properties of the mixed material, the blades and arm portions are more attached. In other words, there may be a disadvantage in terms of maintenance.

  In view of the above points, the present invention provides a twin-screw mixer that has a simple blade structure while improving the mixing performance, keeps the cost low, and is excellent in maintainability with less material adhesion and the like. Is an issue.

In order to solve the above-mentioned problems, the biaxial mixer according to claim 1 according to the present invention has two parallel mixing shafts rotating in the opposite directions in the mixing tank, and is provided on one side surface of each mixing shaft. Is arranged along the mixing tank on both sides of the mixing shaft on the opposite side of the mixing shaft , while rotating along the inner wall of the mixing tank to dispose the material in the mixing tank to both ends of the mixing tank. An arc-shaped scraping blade that rotates along the inner wall and scrapes the material in the mixing tank toward the center of the mixing tank is provided.

In addition, the biaxial mixer according to claim 2 is characterized in that the scraping blade is formed so that the length in the mixing axis direction is substantially the same as the total length of the mixing tank.

According to the biaxial mixer of the first aspect of the present invention, two parallel mixing shafts rotating in the opposite directions are disposed in the mixing tank, and one side surface of each mixing shaft is provided on the inner wall of the mixing tank. Rotating along the two sides of the mixing shaft on the opposite side of the mixing axis , while rotating along the inner wall of the mixing tank Since the arc-shaped scraping blade that scrapes the material in the mixing tank toward the center of the mixing tank is arranged, the shearing action by the scraping blade and the mixing action by the scraping blade are repeated for the material in the mixing tank. It can be applied and maintain efficient mixing, but it has a simple structure with a relatively small number of blades and arms on the mixing shaft, so that the equipment cost can be kept low and there is little adhesion of the mixture. Equipment with excellent maintainability Rukoto can.

Further, according to the biaxial mixer according to claim 2 of the present invention, since the scraping blade is formed with the length in the mixing axis direction substantially the same as the total length of the mixing tank, the material in the mixing tank Can be applied dynamically and continuously to both ends of the mixing tank to impart a shearing action, and a high mixing efficiency can be maintained even with a simple blade structure.

  In the biaxial mixer according to the present invention, one side of each mixing shaft rotates along the inner wall of the mixing tank, and the mixed material staying in the mixing tank is scraped and spread to both ends of the mixing tank. In order to be able to go, a scraping blade that is substantially the same length as the total length of the mixing tank and is formed in a substantially square shape is arranged, while the inner wall of the mixing tank is placed on the opposite side surface across the mixing shaft in the same manner as the scraping blade. So that the mixed material on both sides in the mixing tank is scraped to the center side of the mixing tank and mixed in an arc shape with a length of about 1/3 of the total length of the mixing tank. A pair of formed scraping blades are disposed at both end positions of the mixing shaft.

  And when producing ready-mixed concrete, for example, as a mixture by the above-mentioned biaxial mixer, various concrete materials such as gravel, sand, cement, admixture, and water are put into the mixing tank in predetermined amounts, and a mixing shaft driving motor Rotate the two mixing shafts in opposite directions at a predetermined speed. At this time, the concrete material in the mixing tank is scraped and spread to the both ends of the mixing tank by the scraping blades on one side while rotating each mixing shaft once, and thus receives a strong shearing action. Next, the concrete material scraped to both ends of the mixing tank is scraped to the center side of the mixing tank by the scraping blades on the other side, whereby the materials collide violently and receive a strong stirring / mixing action. In this way, with continuous rotation of the mixing shaft, the concrete material in the mixing tank continues to repeatedly receive strong shearing action and stirring / mixing action, and kneading is performed efficiently to produce high-quality ready-mixed concrete. it can.

  On the other hand, since there are not many mixing blades or arms around the mixing axis of this biaxial mixer unlike the conventional biaxial mixer, the mixture with respect to the mixing axis is mixed even when mixing highly adherent materials. The amount of adhesion is extremely small, and there is no fear that the mixing ability of the mixer will be greatly reduced even if the mixing operation is performed continuously.

  In this way, by devising the shape of the mixing blades on the mixing shaft of the twin-screw mixer and simplifying it by reducing the number of mixing blades, the mixing cost can be improved while the equipment cost can be kept low, and the mixing can be reduced. It is possible to provide a two-shaft mixer excellent in maintainability with less adhesion of materials and mixtures.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In the figure, reference numeral 1 denotes a twin-screw mixer that stirs and mixes various mixed materials to produce a desired mixture. Two parallel mixing shafts 3 and 3 'are placed in a mixing tank 2 composed of two twin cylinders. It penetrates horizontally and is rotatably supported by a bearing 4 and a driving device fixed to the mixing tank 2.

  On one side surface around the axis of each mixing shaft 3, 3 ′, the mixed material that rotates along the inner wall of the mixing tank 2 and stays in the vicinity of the center of the bottom of the mixing tank 2 is scraped at a stroke toward both ends of the mixing tank 2. Scraping blades 5 that are substantially the same length as the total length of the mixing tank 2 and are formed in a substantially square shape are fixed via the arms 6 so that they can spread and give a strong shearing action to the mixed material. . The length of the scraping blade 5 is approximately the same as the total length of the mixing tank 2 in the illustrated example, but is not necessarily limited to this length. Even if the length is slightly away from the side wall, it is possible to give a sufficient shearing action to the mixed material.

  On the other hand, on the opposite side of each mixing shaft 3, 3 ′, the mixed material that rotates along the inner wall of the mixing tank 2 and stays in the vicinity of both ends of the bottom of the mixing tank 2, similar to the scraping blade 5, is located on the center side of the mixing tank 2. A pair of scraping blades 7 having a length of about 1/3 of the total length of the mixing tank 2 and formed in an arc shape so that the mixing shafts 3 and 3 ′ can be mixed. It arrange | positions in the position and it adheres through the arm 6 similarly to the scraping blade 5. In the illustrated example, the discharge gate attached to the center of the bottom of the mixing tank 2 is omitted.

  A gap D having a length of about 1/3 of the total length of the mixing tank 2 was formed between the pair of scraping blades 7 and was scraped from the scraping blades 7 on both sides toward the center of the mixing tank 2. The mixed material passes through the gap D and is then scraped left and right by the top of the scraping blade 5 that rotates.

  The length ratio between the left and right scraping blades 7 and the gap D is approximately 1: 1: 1 in this embodiment, but is not necessarily limited to this ratio, and depends on the properties of the mixed material and the like. Therefore, it may be set as appropriate so as to optimize the mixing efficiency or mixing efficiency.

  Reference numeral 8 in the figure denotes a drive motor for the mixing shafts 3 and 3 ′, and reference numeral 9 denotes a speed reducer that transmits the driving force to the mixing shafts 3 and 3 ′ while reducing the rotational speed of the drive motor 8. A coupling mechanism 10 synchronizes the rotational speeds of the left and right mixing shafts 3 and 3 '.

  Thus, when the ready-mixed concrete is produced by stirring and mixing various concrete materials such as gravel, sand, cement, admixture, water, etc., which are mixed materials in the biaxial mixer 1 having the above-described configuration, The concrete material weighed by a predetermined amount is sequentially put into the mixing tank 2, while the driving motor 8 is driven to rotate the two mixing shafts 3 and 3 'in opposite directions at a predetermined speed.

  At this time, the concrete material staying inside the mixing tank 2 is scraped and expanded to both ends of the mixing tank 2 at once by the scraping blades 5 on one side while the mixing shafts 3 and 3 'make one rotation. As a result, each material is subjected to a strong shearing action. Next, the concrete material that has been scraped to both ends of the mixing tank 2 is now scraped to the center of the mixing tank 2 by the scraping blades 7, thereby causing the materials to collide violently and receive a strong stirring / mixing action. .

  Thus, when the mixing shafts 3 and 3 'are continuously rotated, the concrete material in the mixing tank 2 continuously receives a strong shearing action and agitation / mixing action, thereby efficiently mixing sufficiently. It is possible to produce high-quality ready-mixed concrete.

  Thus, around each mixing shaft 3, 3 ′ in the mixing tank 2, one scraping blade 5 and two scraping blades 7 are arranged, as shown in FIG. The simple blade structure that does not include a large number of mixing blades 105, arms 106, etc. as in the two-shaft mixer 101 of the present invention can reduce the apparatus cost and adhere the mixture around the mixing shafts 3, 3 '. Therefore, it is possible to provide a two-shaft mixer that is small and has excellent maintainability.

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. It is AA sectional drawing which abbreviate | omitted a part of FIG. FIG. 2 is a perspective view in which a part of FIG. 1 is cut away and omitted. It is a top view which shows the conventional biaxial mixer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Biaxial mixer 2 ... Mixing tank 3, 3 '... Mixing shaft 5 ... Scraping blade 6 ... Arm 7 ... Scraping blade 8 ... Drive motor 9 ... Reduction gear

Claims (2)

Two parallel mixing shafts rotating in opposite directions are arranged in the mixing tank, and the material in the mixing tank is rotated along the inner wall of the mixing tank on one side of each mixing shaft to both ends of the mixing tank. A circle that scrapes the material in the mixing tank to the center of the mixing tank by rotating along the inner wall of the mixing tank on both sides of the mixing axis on the opposite side of the mixing axis A biaxial mixer characterized by an arc-shaped scraping blade. 2. The biaxial mixer according to claim 1, wherein the scraping blade is formed so that a length in a mixing axis direction is substantially the same as an entire length of the mixing tank.

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