JP6837293B2 - Liner mounting structure and concrete mixer with this mounting structure - Google Patents

Description

The present invention relates to a liner mounting structure applied to a concrete mixer that kneads a plurality of materials to produce ready-mixed concrete.

Conventionally, when producing ready-mixed concrete, each material such as gravel as a coarse aggregate, sand as a fine aggregate, cement, water, and an admixture is weighed. After that, each material is put into a concrete mixer, and each material is kneaded to produce ready-mixed concrete (see, for example, Patent Document 1).

FIG. 8 is a diagram showing an example of the internal configuration of a conventional concrete mixer. The concrete mixer 40 includes a mixer main body 41 and two kneading shafts 42 rotatably provided in the mixer main body 41. The kneading shaft 42 is provided with a plurality of paddles 43 for kneading each of the above materials. Each paddle 43 includes an arm 44 connected to each kneading shaft 42 and a blade 45 provided at the tip thereof. Two motors 46 for rotationally driving each kneading shaft 42 are provided outside the mixer body 41.

In the concrete mixer 40, the above-mentioned materials are put into the mixer main body 41, and each kneading shaft 42 is rotated in the circumferential direction by each motor 46, so that each material is kneaded by the blade 45. During this kneading, the material moves and is agitated inside the mixer body 41, and a part of the material moves along the inner wall surface of the mixer body 41. Since the inner wall surface of the mixer main body 41 is rubbed and scraped by the movement of this material, a steel plate liner 47 is usually attached to the inner wall surface of the mixer main body 41 by, for example, bolting to protect the inner wall surface. I try to do it.

FIG. 9 is a view showing the inner wall surface of the mixer main body 41 which is the support surface of the kneading shaft 42, and a plurality of liners 47 having different shapes are attached to the inner wall surface as well. Each time the liner 47 is kneaded with the concrete mixer 40, the surface of the liner 47 is rubbed by the material, so that the liner 47 wears over time. Therefore, the liner 47 is replaced with a new one at the right time. The liner 47 is attached to the inner wall surface by bolting, and can be replaced by removing and removing the bolt.

Normally, as shown in FIG. 10, adjacent liners 47 are attached to the inner wall surface of the mixer main body 41 so that their side surfaces face each other. Therefore, after each material is kneaded, the ready-mixed concrete C may enter the gap 48 between the adjacent liners 47 and solidify.

Therefore, when replacing the liner 47, it is necessary to insert a rod-shaped tool such as a crowbar into the gap 48 to remove the ready-mixed concrete C. In this case, since the gap 48 between the liners 47 is relatively narrow, it is difficult to remove the ready-mixed concrete C. Therefore, there is a problem that the replacement work of the liner 47 is very troublesome and time-consuming.

Japanese Unexamined Patent Publication No. 2009-95781

The present invention has been devised under the above circumstances, and an object of the present invention is to provide a liner mounting structure capable of easily and quickly replacing a liner. Another object of the present invention is to provide a concrete mixer having a mounting structure for the liner.

Mounting structure of the liner, which is a first aspect of the present invention, the internal wall surface of the concrete mixer Sa kneading gravel, sand, cement, the constituent material of the fresh concrete consisting of water and admixture to produce a raw concrete In addition, it is a liner mounting structure that is mounted so as to create a gap between facing side surfaces , and the liner is provided with a substantially plate-shaped main body, and the side surfaces of the main body are tapered, and are adjacent to each other. It is attached to the inner wall surface so that the gap between the side surfaces of the liner that fits is narrowed toward the inside of the concrete mixer, and the front surface of the liner is aged by being rubbed by the plurality of materials. However, the more it wears, the wider the gap between the side surfaces of the adjacent liners .

In the liner mounting structure of the present invention, the concrete mixer is provided with a kneading shaft that is rotatable in the axial direction while supporting a paddle for kneading the constituent materials of the ready-mixed concrete. It is preferable that the inner wall surface of the main body is attached to the support surface of the kneading shaft.

In the liner mounting structure of the present invention, the liner may be formed in a substantially fan shape when viewed from the front.

In the liner mounting structure of the present invention, the liner is formed with a plurality of bolt holes penetrating in the thickness direction, and each bolt hole is on a different circumference centered on the axis of the kneading shaft. It is good that they are arranged in each.

The concrete mixer provided by the second aspect of the present invention is characterized by having the liner mounting structure provided by the first aspect of the present invention.

According to the present invention, the liner attached to the inner wall surface of the concrete mixer is attached to the inner wall surface so that the gap between the side surfaces of the adjacent liners narrows toward the inside of the concrete mixer. The front surface of the liner is worn by the material each time the material is kneaded inside the concrete mixer, but the gap between adjacent liners becomes wider as the front surface of the liner wears. Become. Therefore, when the liner is replaced with a new one, it becomes easy to insert a tool such as a crowbar into the widened gap, and the liner replacement work can be easily performed in a short time.

It is a perspective view of the concrete mixer to which the liner mounting structure which concerns on this invention is applied. It is a figure which shows the inner wall surface of a concrete mixer. It is a perspective view which looked at the fan-shaped liner from the front side. It is a side view and a partially enlarged view of a fan-shaped liner. It is sectional drawing of the bolt hole of a fan-shaped liner. It is a front view of a fan-shaped liner. It is a figure which shows the gap between adjacent fan-shaped liners, (a) shows the state after the fan-shaped liner is attached, and (b) shows the state after aged use. It is a schematic internal block diagram of a conventional concrete mixer. It is a figure which shows the inner wall surface of the conventional concrete mixer. It is a figure which shows the gap between the conventional liners which are adjacent to each other.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a perspective view of a concrete mixer to which the liner mounting structure according to the present invention is applied, and FIG. 2 is a view showing an internal wall surface of the concrete mixer. In FIG. 1, the top plate of the concrete mixer is omitted.

The concrete mixer 1 is for kneading gravel (coarse aggregate), sand (fine aggregate), cement, water, an admixture, etc., which are constituent materials of ready-mixed concrete, in the process of manufacturing ready-mixed concrete. The concrete mixer 1 is usually provided inside a ready-mixed concrete manufacturing apparatus called a batcher plant (not shown). Each of the weighed materials is put into the concrete mixer 1 from a weighing hopper (not shown), and the ready-mixed concrete kneaded by the concrete mixer 1 is used as an agitator vehicle (not shown) to carry it out to the site. It is discharged.

The concrete mixer 1 has a mixer body 2 having a desired size. Inside the mixer body 2, two kneading shafts 3 are rotatably arranged side by side. The kneading shaft 3 is formed in a substantially columnar shape extending in a predetermined direction. The two kneading shafts 3 are rotated in opposite directions.

Each kneading shaft 3 is rotationally driven by a drive motor 4 attached to the side surface of the mixer main body 2 and a speed reducer (not shown). Each of the drive motors 4 serves as a drive source for the rotation of the kneading shaft 3. The speed reducer is for changing the driving force of the drive motor 4.

The kneading shaft 3 is provided with a plurality of paddles 5 having different shapes. Each paddle 5 includes an arm 6 connected to the kneading shaft 3 and a blade 7 provided at the tip of the arm 6.

Since each paddle 5 is provided on the peripheral surface of the kneading shaft 3, the kneading shaft 3 is rotated to rotate around the kneading shaft 3. The mixer body 2 is substantially formed along the outer rotation locus of each paddle 5, that is, a curved surface portion 8 in which two columnar members partially cut out are connected, and both ends of the curved surface portion 8. It is roughly formed by the two end side surface portions 9 formed in the above.

A plurality of liners are attached to the inner wall surfaces of the curved surface portion 8 and the end side surface portion 9, respectively. The liner is for protecting the inner wall surface of the mixer main body 2, and is formed in a substantially plate shape. Strictly speaking, the liner attached to the curved surface portion 8 is formed in a slightly curved plate shape, and the liner attached to the end side surface portion 9 is formed in a flat plate shape. Cast iron is used for each liner instead of the conventional steel plate. Cast iron has the advantage of being superior in wear resistance to steel sheets. The surface of these liners gradually wears as each material moves, stirs, and is kneaded inside the mixer body 2. Therefore, these liners are being replaced with new ones as needed.

As shown in FIG. 2, a plurality of types of liners are attached to the inner wall surface of the end side surface portion 9 which is the support surface of the kneading shaft 3. The liner is composed of a fan-shaped liner 11 formed in a substantially fan shape, a trapezoidal liner 12 formed in a substantially trapezoidal shape, and a semi-doughnut-shaped liner 13 formed in a substantially semi-doughnut shape with a part cut out. To.

A liner having a substantially rectangular shape or a substantially rhombic shape is attached to the inner wall surface of the curved surface portion 8, but here, a liner attached to the inner wall surface of the end side surface portion 9 will be mainly described.

The fan-shaped liners 11 are arranged radially along the periphery of the semi-doughnut-shaped liner 13. Eight fan-shaped liners 11 are attached to each of the two kneading shafts 3. The trapezoidal liner 12 is arranged around the semi-doughnut-shaped liner 13 and between the two kneading shafts 3 so that one side of the liner 12 abuts against each other. Two trapezoidal liners 12 are attached corresponding to the two kneading shafts 3. Two semi-doughnut-shaped liners 13 are attached and arranged around the support surface of the kneading shaft 3.

FIG. 3 is a perspective view of the fan-shaped liner 11 as viewed from the front surface 11a side. The fan-shaped liner 11 includes a substantially fan-shaped main body having a predetermined thickness. In the fan-shaped liner 11, the upper side surface 14 and the lower side surface 15 in FIG. 3 are each formed in a curved shape, and the side length of the upper side surface 14 is longer than that of the lower side surface 15. The radius of curvature of the upper side surface 14 is larger than that of the lower side surface 15.

On the other hand, the right side surface 16 and the left side surface 17 of the fan-shaped liner 11 in FIG. 3 are flat surfaces. The lengths of one side of the right side surface 16 and the left side surface 17 are set to be equal.

Here, the right side surface 16 and the left side surface 17 of the fan-shaped liner 11 are formed in a tapered shape. That is, as shown in FIG. 4, the right side surface 16 and the left side surface 17 are arranged from the front surface 11a side to the back surface 11b so that the area of the front surface 11a of the fan-shaped liner 11 is larger than the area of the back surface 11b. It is sloped toward the side. The upper side surface 14 and the lower side surface 15 of the fan-shaped liner 11 may also be formed in a tapered shape.

The main body of the fan-shaped liner 11 is formed with three first to third bolt holes 21 to 23 penetrating in the thickness direction. The first and second bolt holes 21 and 22 are formed in the vicinity of the upper side surface 14, and the third bolt hole 23 is formed in the vicinity of the lower side surface 15.

As shown in FIG. 5, a recessed step 24 is formed around the front surface 11a side of the first bolt hole 21. Further, a substantially circular convex portion 25 is formed around the back surface 11b side of the first bolt hole 21. Although not shown, the second and third bolt holes 22 and 23 are also formed with a step 24 and a convex portion 25 in the same manner as the first bolt hole 21.

Here, the first bolt hole 21 and the second bolt hole 22 are formed at positions slightly offset asymmetrically in the fan-shaped main body. That is, as shown in FIG. 6, assuming that the intersection of the right side surface 16 and the left side surface 17 on the extension line is the center P, the distances of the first bolt hole 21 and the second bolt hole 22 from the center P are different. It is formed at each position. The distance L1 from the center P in the first bolt hole 21 is set to be longer than the distance L2 from the center P in the second bolt hole 22. The center P coincides with the axis of the kneading shaft 3.

Next, the operation of the liner mounting structure of the present embodiment will be described.

When the fan-shaped liner 11 is attached to the inner wall surface of the mixer main body 2, the front surface 11a is attached so that the front surface 11a faces the inner side of the mixer main body 2. As described above, the right side surface 16 and the left side surface 17 of the fan-shaped liner 11 are formed in a tapered shape so that the area of the front surface 11a is larger than the area of the back surface 11b. Therefore, as shown in FIG. 7A, the gap A between the adjacent fan-shaped liners 11 becomes narrower toward the inside of the mixer main body 2.

In the fan-shaped liner 11, each time each material is kneaded in the concrete mixer 1, the front surface 11a is gradually rubbed and scraped by the material. Therefore, as shown in FIG. 7B, the front surface 11a of the fan-shaped liner 11 wears over time. In this case, since the adjacent fan-shaped liners 11 are arranged so that their gaps A narrow toward the inside of the mixer body 2, the gap A will be formed if the front surface 11a of the fan-shaped liners 11 is worn. The more you do, the more it will spread.

Therefore, when the fan-shaped liner 11 is replaced with a new one, it becomes easy to insert a tool such as a crowbar into the widened gap A, and even if the ready-mixed concrete C (see FIG. 10) enters the gap A, it is removed. It becomes easier to do. Therefore, the fan-shaped liner 11 can be easily replaced in a short time.

That is, in the mounting structure of the fan-shaped liner 11 in the present embodiment, the front surface 11a of the fan-shaped liner 11 is worn over time and the thickness of the fan-shaped liner 11 itself becomes thin. In this way, although the fan-shaped liner 11 proceeds in a direction that is disadvantageous in terms of shape in protecting the inner wall surface of the mixer body 2, the gap A between the fan-shaped liners 11 expands due to aging, so that the fan-shaped liner 11 is replaced. It will proceed in a direction that is advantageous for maintenance work such as work.

Further, as shown in FIG. 6, the first bolt holes 21 and the second bolt holes 22 of the fan-shaped liner 11 are formed at positions slightly offset asymmetrically, so that the front surface 11a of the fan-shaped liner 11 is formed. The progress of wear can be delayed. That is, since a step 24 is formed on the front surface 11a side of each bolt hole 21 to 23 of the fan-shaped liner 11, when the material is kneaded, the material collides with the edge of the step 24 and collides. Depending on the material, the formation region of the step 24 gradually expands.

The material charged into the mixer body 2 is moved, stirred and kneaded by each paddle 5, but the material near the inner wall surface of the mixer body 2 has the same circumference centered on the axis of the kneading shaft 3. Often move up. Therefore, if the first and second bolt holes 21 and 22 are formed so that the distances from the axis P of the kneading shaft 3 are equal, the formed region of the step 24 of the first bolt hole 21 collides with the material. As the expansion progresses, a groove-shaped recess that connects the first and second bolt holes 21 and 22 is formed. Therefore, this groove-shaped recess causes an earlier replacement time of the fan-shaped liner 11.

However, in the present embodiment, since the first and second bolt holes 21 and 22 of the fan-shaped liner 11 are formed at different positions from the center P, it is possible to prevent the groove-shaped recesses as described above from being formed. be able to. Therefore, the progress of wear of the front surface 11a of the fan-shaped liner 11 can be delayed, and the life of the fan-shaped liner 11 can be extended.

In the above embodiment, the configuration of the fan-shaped liner 11 to be mounted on the inner wall surface of the end side surface portion 9 which is the support surface of the kneading shaft 3 and the mounting structure thereof have been mainly described, but the mounting structure of the fan-shaped liner 11 has been mainly described. May be applied to trapezoidal liners 12, semi-doughnut-shaped liners 13, and substantially rectangular or substantially rhombic liners attached to the inner wall surface of the curved surface portion 8 of the mixer body 2.

The scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the form, size, quantity, structure, etc. of each member in the above embodiment are not limited to the above embodiment, and the design can be changed as appropriate. For example, the shape and number of the fan-shaped liner 11 and the like shown in the above embodiment and the number of bolt holes formed therein are not limited to those described above.

1 Concrete mixer 2 Mixer body 3 Kneading shaft 5 Paddle 8 Curved surface 9 End side surface 11 Fan-shaped liner 11a Front surface 11b Back surface 14 Upper side surface 15 Lower side surface 16 Right side surface 17 Left side surface 21 First bolt hole 22 2nd bolt hole 23 3rd bolt hole

Claims (5)

A liner that is attached to the inner wall surface of a concrete mixer that kneads the constituent materials of ready-mixed concrete consisting of gravel, sand, cement, water and admixtures to produce ready-mixed concrete so that there is a gap between the opposing sides. It is a mounting structure
The liner
It has a substantially plate-shaped main body, and the side surface of the main body is tapered.
It is attached to the inner wall surface so that the gap between the side surfaces of the adjacent liners narrows toward the inside of the concrete mixer.
The liner is characterized in that the front surface of the liner is aged by being rubbed by the constituent material of the ready-mixed concrete, and the more the surface is worn, the wider the gap between the side surfaces of the adjacent liners. Mounting structure. The concrete mixer
A kneading shaft that is rotatable in the axial direction while supporting a paddle for kneading the constituent materials of the ready-mixed concrete is provided.
The liner
The liner mounting structure according to claim 1, which is an internal wall surface of the main body and is mounted on a support surface of the kneading shaft. The liner mounting structure according to claim 1 or 2, wherein the liner is formed in a substantially fan shape when viewed from the front. The liner
Multiple bolt holes that penetrate in the thickness direction are formed,
Each bolt hole is
The liner mounting structure according to claim 2, wherein the liners are arranged on different circumferences about the axis of the kneading shaft. The concrete mixer according to claim 1, wherein the concrete mixer has a liner mounting structure.

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