JP4059453B2 - 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]
Therefore, the present inventors repeated tests while changing the arrangement of the blades of the biaxial mixer in order to confirm that there is no more effective arrangement of the blades than the one-line spiral feed blade arrangement. As a result of overlapping, it was found that the kneading effect can be improved over the conventional biaxial mixer when a small blade is attached to the opposite side of the feed blade to form a two-row spiral blade arrangement.
[0007]
That is, in the biaxial concrete mixer according to claim 1 of the present invention, two parallel kneading shafts rotating in opposite directions are arranged in the kneading tank, and each kneading shaft has a predetermined angle around the axis. The first arm is erected so as to be spirally arranged at predetermined intervals in the axial direction while being shifted one by one, and substantially the same length as the first arm on the opposite side of the first arm mounting position of the kneading shaft. The second arms of the first and second arms are symmetrically erected to form a double spiral arm, and each of the symmetrically erected first and second arms has an adjacent blade tip. It is characterized in that a large blade whose size is substantially overlapped with the rotation trajectory of the portion and a small blade whose length in the kneading axis direction is shorter than that of the large blade.
[0008]
In the biaxial concrete mixer according to claim 2 of the present invention, the first arm and the second arm are spirally arranged at predetermined intervals in the axial direction while shifting about 45 degrees around the kneading axis. A large blade is attached from one end of the kneading shaft to the vicinity of the central portion, and a small blade is attached from the vicinity of the central portion to the other end of the kneading shaft to the first arm that is erected so as to have one spiral arrangement, The other spiral-arranged second arm is characterized in that a blade having a size opposite to that of the first arm blade provided symmetrically is attached.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to the biaxial concrete mixer of the first aspect of the present invention, two spirally arranged arms are formed on the kneading shaft by the first arm group and the second arm group, and are erected symmetrically. Large blades and small blades are attached to each of the first arm and the second arm to form two spiral blades. Therefore, both the large blade and the small blade give the opportunity to knead the material during one rotation of the kneading shaft, and the screw effect and shearing action of the two spiral blades composed of the large blade and the small blade make it possible to The kneading time can be shortened because kneading can be performed faster than the twin screw mixer of a single spiral blade, and the material discharge speed from the mixer can be increased.
[0010]
In addition, the large blades are arranged so that the rotation trajectories of the adjacent blade ends almost overlap, and the small blades are made smaller than the large blades, so that the entire material is moved so that there is no scraping of material with the large blades. Kneading and giving a change different from the large blade of cutting into the material with small blades, so that not only the material is carried around, but more effective kneading is performed by the interaction between the large blade and the small blade, The kneading time can be shortened.
[0011]
Further, according to the biaxial concrete mixer according to claim 2 of the present invention, the two spiral blades are arranged in a closely packed state while being shifted by approximately 45 degrees, but one spiral blade is one end of the kneading shaft. From the center of the kneading shaft to the other end of the kneading shaft and the other end of the kneading shaft as small blades, and the other spiral blade is attached with a blade of the opposite size, so two kneading The blades attached to the shaft can be attached without contacting each other during rotation. In addition, the mixing is rapidly performed by increasing the opportunity for mixing by the two spiral blades and the rapid movement of the material to the left and right by the blades arranged in a spiral manner shifted by about 45 degrees.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
Reference numeral 1 in the figure denotes a biaxial mixer for producing ready-mixed concrete by kneading materials such as gravel, sand, cement, water, admixture, etc., and two parallel kneading shafts 3 and 3 'are provided in the kneading tank 2. The bearing 4 that penetrates and is fixed to the kneading tank 2 is rotatably supported.
[0014]
The first arm 5 is erected on the kneading shafts 3 and 3 'so as to be arranged in a substantially spiral shape (screw shape) at predetermined intervals in the axial direction while being shifted by about 45 degrees to 90 degrees around the axis.
[0015]
Further, a second arm 6 having substantially the same length as that of the first arm 5 is provided symmetrically at a position substantially opposite to the first arm 5. Alternatively, the first arm 5 and the second arm 6 may be formed by a single arm and penetrated through the kneading shafts 3 and 3 ′. In this way, the first arm 5 group and the second arm 6 group form an arm having a two-row spiral arrangement.
[0016]
Large blades 7 and small blades 8 each having a blade shape for mixing materials by a screw effect and a shearing action are attached to the tips of the two spirally arranged arms 5 and 6. The large blades 7 and the small blades 8 are attached such that when the large blades 7 are attached to the symmetrically erected first arm 5, the small blades 8 are attached to the second arm 6 at the other opposite position. When the kneading shafts 3, 3 'rotate once, the large blades 7 and the small blades 8 rotate the same material layer once to mix the materials.
[0017]
The large blade 7 has a size and an arrangement in which the ends of the adjacent large blades 7 and 7 are substantially overlapped when viewed from the vertical direction of the kneading shafts 3 and 3 ′. It is preferable that the two layers overlap each other, so that the material can be moved over the entire area of the kneading tank 2 without scraping the material.
[0018]
The small blades 8 are sized so as not to come into contact with the large blades 7 of the kneading shafts 3, 3 ′ that are opposed to each other when the kneading shafts 3, 3 ′ are rotated. 7, the axial length of the kneading shafts 3, 3 ′ is preferably shortened. By making the small blades 8 small, it is possible to give a change of cutting into a material different from that of the large blades 7, and simply by the shearing action at different positions due to the difference in size between the large blades 7 and the small blades 8. It is considered that more effective mixing can be expected by the interaction between the large blades 7 and the small blades 8. If the large blades 7 and the small blades 8 inevitably come into contact with each other when the kneading shafts 3 and 3 ′ are rotated, the attachment positions of the first arm 5 and the second arm 6 may be slightly shifted.
[0019]
The first arm 5 and the second arm 6 to which the large blade 7 and the small blade 8 are attached have substantially the same length as described above, but the length of the large blade 7 and the small blade 8 of the kneading tank 2 is the same. The length can be rotated along the inner wall. As a result, the peripheral speed of the small blades 8 is increased, and the same material on the inner wall side of the kneading tank 2 as the large blades 7 is moved to assist the screw effect and shearing action of the large blades 7 so that effective mixing can be expected.
[0020]
Further, a return blade 9 for changing the moving direction of the material is attached to the first arm 5 at one end of the kneading shafts 3 and 3 '. The large blade 7, the small blade 8, and the return blade 9 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, left and right by giving the blades a recommended angle and a rake angle. The kneading tank 2 is made to move around the entire area while being moved.
[0021]
The blade arrangement shown in FIGS. 1 to 3 shows a structure in which large blades 7 and small blades 8 are attached to arms 5 and 6 in a spiral arrangement shifted about 45 degrees around the axis of the kneading shafts 3 and 3 ′. Yes. In the two spiral blades shifted by about 45 degrees, the first arm 5 from one end of the kneading shafts 3 and 3 ′ to the vicinity of the central portion is provided with the large blade 7 and the first blade from the vicinity of the central portion to the other end. A small blade 8 is attached to the arm 5.
[0022]
The second arm 6 is attached with large blades 7 and small blades 8 having sizes opposite to those of the first arm 3 located on the opposite side. That is, if the large blade 7 is attached to the first arm 3, the small blade 8 is attached to the second arm 6, and if the small blade 8 is attached to the first arm 3, the second arm 6 is attached. The large blade 7 is attached to.
[0023]
When the large blade 7 and the small blade 8 are attached to each of the kneading shafts 3 and 3 ′, the large blade 7 and the small blade 8 of the opposed kneading shafts 3 and 3 ′ are almost opposed to each other. To prevent the blades from contacting each other during rotation. If the large blades 7 and the small blades 8 inevitably come into contact with each other when the kneading shafts 3 and 3 ′ are rotated, the attachment positions of the first arm 5 and the second arm 6 may be slightly shifted.
[0024]
In this manner, the spiral blades shifted by approximately 45 degrees are formed in a single spiral shape with the large blade 7 from one end of the kneading shafts 3, 3 ′ to the vicinity of the center and the small blade 8 from the vicinity of the center to the other end of the shaft. If the blades are formed, it can be arranged so that they do not come into contact with each other during rotation.
[0025]
When the two spirally arranged arms 5 and 6 are shifted 90 degrees around the kneading shafts 3 and 3 ', the large blades 7 are attached to all the first arm 5 groups, and the second arm 6 Although the small blades 8 are attached to all of the groups, it is considered that the large blades 7 and the small blades 8 attached to the kneading shafts 3 and 3 'facing each other at the time of rotation can be arranged so as not to contact each other. Whether the spiral blades are arranged as the large blades 7 and the small blades 8 may be determined as appropriate.
[0026]
Gears 10, 10 'are mounted and fixed to one end of the kneading shafts 3, 3', and the kneading shafts 3, 3 'are rotated at a synchronous speed by engaging the gears 10, 10'. Yes.
[0027]
Further, sprockets 11 and 11 'are mounted and fixed to the other end portions of the kneading shafts 3 and 3' as rotation transmission mechanisms, and the sprockets 13 and 11 'and the sprockets 13 and 12' attached to the driving motors 12 and 12 ', 13 'is connected by chains 14 and 14', and kneading shafts 3 and 3 'are rotated in directions indicated by arrows in FIG. 3 by drive motors 12 and 12'.
[0028]
Then, when the kneading shafts 3 and 3 'of the biaxial mixer 1 are rotated and the concrete material is put into the kneading tank 2, the material is moved up and down, left and right by both the large blade 7 and the small blade 8, The material is kneaded by the screw effect and shearing action. In the two spiral blades, both the large blade 7 and the small blade 8 give the opportunity to mix the material while the kneading shafts 3 and 3 'make one rotation. Even if the screw effect and the shearing action increase compared to the mixer, it can be kneaded faster. In addition, the material discharge speed from the mixer is increased and the kneading time can be shortened.
[0029]
Further, the large blades 7 are arranged so that the rotation trajectories of the adjacent large blades 7 and 7 end portions are almost overlapped, and the small blades 8 are smaller than the large blades 7 so that the large blades 7 do not leave any scrap of material. The entire material is kneaded while being moved, and the small blade 8 gives a change different from that of the large blade 7 such as cutting into the material. More effective kneading is performed by the action, and the kneading time can be shortened.
[0030]
In addition, when the present inventors conducted a kneading test using the actual machine of the biaxial mixer according to claim 2 of the present invention, the kneading is completed in a shorter time than the conventional biaxial mixer, and the material discharging speed is increased. As a result, it was confirmed that the kneading batch cycle was further shortened and a further increase in capacity could be expected. Also, the large blades 7 and the small blades 8 are arranged symmetrically, and the movement of the material of the surface layer portion becomes smooth because the two blades lift and move the material of the same layer near the inner wall of the kneading tank 2. Various effects were also confirmed, such as a phenomenon in which the material hits the inner wall of the kneading tank 2 and scatters, thereby reducing material adhesion to the upper inner wall of the kneading tank 2.
[0031]
【The invention's effect】
As described above, in the biaxial concrete mixer of the present invention, two parallel kneading shafts rotating in the opposite directions are arranged in the kneading tank, and each kneading shaft is shifted by a predetermined angle around the axis. The first arm is erected so as to be spirally arranged at predetermined intervals in the axial direction, and the second arm having the same length as that of the first arm is located on the opposite side of the first arm mounting position of the kneading shaft. The two arms are symmetrically erected to form a two-armed arm, and each of the symmetrically erected first arm and second arm is rotated by the adjacent blade end. Because the large blades whose trajectories are almost overlapped and the small blades whose length in the kneading axis direction is shorter than that of the large blades are attached, the conventional single thread is produced by the screw effect and shearing action of the two spiral blades. Can knead faster than a twin-screw mixer with a spiral blade, Material discharge spin from the mixer was - de can be faster to reduce the mixing time.
[0032]
Further, the first arm and the second arm are erected so as to be spirally arranged at a predetermined interval in the axial direction while shifting the first arm and the second arm about 45 degrees around the kneading axis. A large blade is attached to one arm from one end of the kneading shaft to the vicinity of the center, and a small blade is attached from the vicinity of the center to the other end of the kneading shaft. Since the blades of the opposite size to the blades of the first arm are attached, the blades attached to the two kneading shafts can be attached without contacting each other during rotation, and two spiral blades The kneading is rapidly performed by the increase of the kneading opportunity due to and the rapid movement of the material to the left and right by the spirally arranged blades shifted by about 45 degrees.
[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 arm 6 ... 2nd arm 7 ... Large blade 8 ... Small blade

Claims (2)

In the kneading tank, two parallel kneading shafts rotating in the opposite directions are arranged, and the first kneading shafts are arranged at predetermined intervals in the axial direction while being shifted by a predetermined angle around the respective kneading shafts. The second arm having the same length as that of the first arm is symmetrically erected on the opposite side of the first arm mounting position of the kneading shaft so as to have two spiral arrangements. A large blade that forms an arm and has a size in which rotation trajectories of adjacent blade ends almost overlap each of the first arm and the second arm that are erected symmetrically, and kneading from the large blade A two-shaft concrete mixer characterized in that a small blade with a reduced axial length is attached. The first arm and the second arm are erected so as to be spirally arranged at predetermined intervals in the axial direction while shifting the first arm and the second arm about 45 degrees around the kneading axis. A large blade is attached from one end of the kneading shaft to the vicinity of the central portion, a small blade is attached from the vicinity of the central portion to the other end of the kneading shaft, and the other spirally arranged second arm is erected symmetrically. 2. A biaxial concrete mixer according to claim 1, wherein a blade having a size opposite to that of the first arm is attached.

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