JP4041572B2 - Biaxial concrete mixer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete mixer for producing ready-mixed concrete by kneading gravel, sand, cement, water, and an admixture, and more particularly to a forced kneaded concrete mixer having two kneading shafts.
[0002]
[Prior art]
Biaxial concrete mixers are often used in batcher plants that produce ready-mixed concrete. In this biaxial mixer, two kneading shafts rotating in opposite directions are arranged in a kneading tank, and an arm having feed blades attached to the kneading shaft is shifted by 45 to 90 degrees at predetermined intervals in the axial direction. The structure is arranged in a shape (screw shape). The material is moved over the entire region of the kneading tank while being fed up and down and left and right by a feed blade having a rake angle and a soot angle, and the material is kneaded by the screw effect and shearing action.
[0003]
In this conventional biaxial mixer, the feed blades that rotate along the side wall of the kneading tank are basically arranged in a single spiral around the kneading axis.
[0004]
[Problems to be solved by the invention]
This conventional twin-screw mixer exhibits sufficient kneading performance, but the batcher plant equipped with this twin-screw mixer is a plant where shipments are concentrated at one time. The advent of a mixer with good kneading performance that can be shortened is always desired.
[0005]
In view of the above-mentioned points, the present invention provides a biaxial concrete mixer in which the conventional biaxial mixer is improved and the kneading performance is further improved so that the material can be kneaded in a shorter time than the conventional biaxial mixer. This is the issue.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has two parallel kneading shafts rotating in opposite directions in a kneading tank, and a plurality of arms having feed blades attached to the respective kneading shafts in the axial direction. A plurality of arms, each of which has a first spiral blade standing upright in a spiral arrangement at a predetermined interval and having a feed blade attached at substantially opposite positions between the arms of the first spiral blade of each kneading shaft, The first spiral blade and the second spiral blade are arranged so that the rotation trajectories of the adjacent feed blades almost overlap each other. It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the biaxial concrete mixer according to the present invention, since the phase difference between the first spiral blade and the second spiral blade is approximately 180 degrees, the material pushed and moved by the screw effect of the first spiral blade is kneaded. After the half rotation of the shaft, the material is pushed by the screw effect of the second spiral blade, and this material is again pushed and moved to the first spiral blade after the half rotation of the kneading shaft. In this way, the first spiral blade and the second spiral blade having a phase difference are kneaded by the screw effect and shearing action of the spiral blade while changing the material in a wave-driven manner. Can be kneaded quickly.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
In the figure, reference numeral 1 denotes a biaxial mixer for producing ready-mixed concrete by kneading materials such as gravel, sand, cement, water, and an admixture. The kneading tank 2 has two parallel kneading shafts 3, 3 ′. And is rotatably supported by a bearing 4 fixed to the kneading tank 2.
[0010]
On the kneading shafts 3 and 3 ′, two spiral blades each including a first spiral blade 5 and a second spiral blade 6 are formed.
[0011]
The first spiral blade 5 is erected so that a plurality of arms 7 are shifted in the axial direction of the kneading shafts 3, 3 ′ by 45 ° to 90 ° at predetermined intervals so as to be arranged in a spiral shape (screw shape). The feed blade 8 is attached to the tip of the arm 7.
[0012]
The second spiral blade 6 is erected at substantially the opposite position between the arms 7 and 7 of the first spiral blade 5 having a plurality of arms 9 attached to the kneading shafts 3 and 3 '. The feed vane 10 is attached to.
[0013]
The feed blades 8 and 10 of the first spiral blade 5 and the second spiral blade 6 are sized and arranged so that the respective blade end portions substantially overlap each other when viewed from the vertical direction of the kneading shafts 3 and 3 '. At times, the rotation trajectories of the adjacent feed blades 8 and 10 are substantially overlapped, and the feed blades 8 and 10 are rotated along the inner wall of the kneading tank 2. As a result, the material is moved across the entire area of the kneading tank 2 without being scraped off.
[0014]
Further, in order to enhance the kneading effect, in addition to forming the two spiral blades by the first spiral blade 5 and the second spiral blade 6 as described above, the size of the blade is also made smaller than that of the conventional blade. Thus, it is preferable to increase the number of blades attached compared to the conventional one-line spiral blade, which can further increase the mixing and shearing opportunities and improve the mixing effect.
[0015]
Further, a return blade 11 for changing the moving direction of the material is attached to one end of the kneading shafts 3 and 3 ′. The feed blades 8 and 10 and the return blade 11 are attached at an angle of about 45 degrees with respect to the axial direction of the kneading shafts 3 and 3 ', respectively, and the material is moved up and down and left and right by giving the blades a rake angle and a rake angle. However, it moves around the entire inside of the kneading tank 2.
[0016]
Then, gears 12 and 12 'are attached and fixed to one end of the kneading shafts 3 and 3', and the kneading shafts 3 and 3 'are rotated at a synchronous speed by engaging the gears 12 and 12'. ing.
[0017]
Further, sprockets 13 and 13 'are mounted and fixed to the kneading shafts 3 and 3' as rotation transmission mechanisms at the other end portions of the kneading shafts 3 and 3 ', and the sprockets 15 are attached to the drive motors 14 and 14'. 15 'and chains 16 and 16' are connected, and the kneading shafts 3 and 3 'are rotated by drive motors 14 and 14'.
[0018]
Thus, when the concrete material is introduced into the kneading tank 2 while rotating the kneading shafts 3, 3 ′ of the biaxial mixer 1, the feed blades 8, 10 of the first spiral blade 5 and the second spiral blade 6 are set. In both cases, the material is moved up and down, left and right, and the material is kneaded by the screw effect and shearing action.
[0019]
At this time, since the phase difference between the first spiral blade 5 and the second spiral blade 6 is approximately 180 degrees, the material pushed by the screw effect of the first spiral blade 5 is used for the kneading shafts 3, 3 ′. After the half rotation, the material is pushed by the screw effect of the second spiral blade 6, and this material is again pushed to the first spiral blade 5 after the half rotation of the kneading shafts 3, 3 '. In this way, the first spiral blade 5 and the second spiral blade 6 having a phase difference give a change in which the material is wave-driven, and the number of blades is increased to increase the shearing opportunity. Can be improved.
[0020]
【The invention's effect】
As described above, in the biaxial concrete mixer according to the present invention, a plurality of parallel kneading shafts rotating in the opposite directions are disposed in the kneading tank, and a plurality of blades each having a feed blade attached to each kneading shaft. The arms are erected in a spiral arrangement at predetermined intervals in the axial direction to form first spiral blades, and feed blades are attached at almost opposite positions between the arms of the first spiral blades of each kneading shaft. A plurality of arms are erected in a spiral shape to form a second spiral blade, and the feed trajectories of the first spiral blade and the second spiral blade substantially overlap the rotation trajectories of adjacent feed blade ends. Because of the size and arrangement, the screw effect and shearing action of the first spiral blade and the second spiral blade having different phase differences allow kneading faster than the conventional biaxial mixer.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a biaxial concrete mixer according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a view taken in the direction of arrows AA in FIG. 1;
[Explanation of sign]
DESCRIPTION OF SYMBOLS 1 ... Biaxial mixer 2 ... Kneading tank 3, 3 '... Kneading shaft 5 ... 1st spiral blade 6 ... 2nd spiral blade 7, 9 ... Arm 8, 10 ... Feed blade

Claims (1)

Two parallel kneading shafts rotating in opposite directions are arranged in the kneading tank, and a plurality of arms each having a feed blade attached to each kneading shaft are erected in a helical arrangement at predetermined intervals in the axial direction. A second spiral blade is formed by forming a first spiral blade and a plurality of arms each having a feed blade attached in a spiral manner at substantially opposite positions between the arms of the first spiral blade of each kneading shaft. And the feed blades of the first spiral blade and the second spiral blade have a size and an arrangement in which rotation trajectories of adjacent feed blade end portions substantially overlap each other.

Images