JPH061363Y2 - Concrete mixer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a twin-screw concrete mixer having two kneading shafts in a kneading tank, and particularly to measures for improving sealing performance.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Utility Model Publication No. 58-37616, a twin-screw type in which two kneading shafts are installed in parallel inside a kneading tank, and blades are arranged on the kneading shafts. In a concrete mixer, by forming an outlet in the center of the bottom of the kneading tank and opening and closing this outlet with a rotatable gate, the blade and the outlet as in the case where each outlet is provided below each kneading shaft. It is a known technique to prevent the kneaded material from being caught between the side edges of the kneaded material.

(Problems to be solved by the invention) However, in the above-mentioned conventional one, there is a gap or a step between the hinge part of the gate and the bottom part of the kneading tank, and concrete or sand may be caught in the part or the external part. There is a risk that the sealing performance of the discharge port will gradually deteriorate due to leaking to the interior or accumulation of solidified material. In addition, there is a problem that it takes a lot of time and effort to remove the material bitten in such a gap.

The present invention has been made in view of such a point, and an object thereof is to make the structure of the shaft portion that opens and closes the gate of the discharge port continuous with the kneading tank bottom portion without the hinge portion. It is to improve the sealing performance of the outlet.

(Means for Solving the Problem) In order to achieve the above object, the solution means of the present invention is to provide two parallel kneading shafts inside a kneading tank, and to arrange a blade on each kneading shaft, The target is a biaxial concrete mixer with a discharge port formed in the center of the bottom of the tank.

The bottom of the kneading tank is composed of an elastic plate, and the elastic plate is kneaded from a central cutting line portion cut along the axial direction of the kneading shaft and both ends of the central cutting line portion. A substantially H-shaped notch formed by side notched line portions extending to both sides of the tank is provided, and the notch forms the above-described openable / closable discharge port composed of a pair of double door-shaped flexible pieces.

Furthermore, each flexible piece is supported on the lower surface of each flexible piece,
In addition, a pair of supports that open and close the discharge port by connecting the flexible pieces are connected to each other.

(Operation) With the above configuration, according to the present invention, the flexible port portions are flexed in response to the operation of the pair of supports connected to the pair of double door-shaped flexible plate portions, so that the discharge port is It is opened and closed.

In that case, in the H-shaped cut that forms the discharge port,
The flexible piece is a cantilever plate shape of an elastic plate that is integrally continuous with the bottom formed of an elastic plate, and the flexure opens and closes the discharge port. There is no gap for foreign matter such as sand. Also, since the center line part of the cut and the side cut line part are closed in a scissor shape,
There is no step on the seal that foreign matter may bite into.

Therefore, the discharge port can be opened and closed while maintaining a good sealing property without the inclusion of foreign matter.

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

1 and 2 show the structure of a concrete mixer according to an embodiment of the present invention, in which 1 is a kneading tank and 2 and 2 are two kneading shafts arranged in the kneading tank 1. Kneading shaft 2,
The two are arranged substantially parallel to each other inside the kneading tank 1 and have a structure of a biaxial concrete mixer. The respective kneading shafts 2 are rotatably supported by the frame 1a of the kneading tank 1 via bearing members 3a, 3b, 3c, and rotated by a motor (not shown) via a gear member 4. It is designed to be driven.

Here, as a feature of the present invention, the main part of the kneading tank 1 excluding the upper part of the frame 1a is composed of flexible elastic plates 5 including the bottom part thereof, and the elastic plates 5 are each made of a pair of metals. The inner bands 6 and 6 and the outer bands 7 and 7 are fixed at both ends, and the upper end is fixed to the frame 1a. As shown in FIGS. 3 and 4, the elastic plate 5 has a shape obtained by combining two cylinders substantially along the rotation range of the blades of two kneading shafts 2 and 2 to be described later, and kneading A central line, which is an intersection line of two cylinders, is formed in a raised shape in a central portion corresponding to the bottom of the tank 1. And
At the center of the center line, there is provided a center cut line portion 8 in which the elastic plate 5 is cut by a predetermined length along the center line, and further, from both ends thereof, respectively toward both sides of the kneading tank 1. And two side cut line portions 9, 9 extending linearly. An H-shaped cut 10 is formed by the central cut line portion 8 and the side cut line portions 9 and 9.

Then, in the cut 10, a pair of flexible piece portions 11, 11 surrounded by the central cut line portion 8 and the side cut line portions 9, 9 are formed on both sides of the central cut line portion 8,
The flexible piece portions 11 and 11 are bent with respect to the main body of the elastic plate 5 in a cantilever plate shape and can be opened and closed like a double door. That is, the flexible piece portions 11, 11 form a discharge port 13 for discharging concrete or the like in the kneading tank 1.
It should be noted that each of the flexible pieces 11, 11 has six small holes 1
2, ... are provided, and the small holes are used for supporting members 14 to be described later.
The flexible pieces 11, 11 are attached to the.

On the other hand, as shown in FIGS. 1 and 2, below the elastic plate 5 of the kneading tank 1, the flexible piece portions 11 and 1 of the discharge port 13 are provided.
1 is provided with a pair of support members 14, 14 extending over the entire length of the kneading tank 1, and the flexible piece portion 1 of the discharge port 13 is provided at the center thereof.
A backing plate 15 connected to 1 and a pipe 16 that supports the plate 15 from below are formed in a substantially L shape, and can support the pipe 16 at one end and can swing about an axis near a corner. A bell crank 17 and a hydraulic cylinder 18 (shown by a chain double-dashed line in the figure) attached to the other end of the bell crank 17 for swinging the bell crank 17 are provided. That is, by interlocking the pair of hydraulic cylinders 18 and 18 and swinging the bell cranks 17 and 17 symmetrically, the pair of flexible piece portions 11 and 11 are bent to form a double door, and the discharge port 13 is formed. It is designed to open and close.

It should be noted that each of the support members 14 and 14 is
Further, the center of the elastic plate 5 forming the bottom of the kneading tank 1 is deformed upward by the upward movement, that is, the shape of the bottom of the kneading tank 1 is changed to each kneading shaft 2, It is designed to follow the trajectory of the blade tip of No. 2. That is, the unstirred portion in the kneading tank 1 is reduced as much as possible.

Next, the shape of the blades of the kneading shafts 2 and 2 will be described. 5 to 7 show the structure of the first blade 20 arranged on the one kneading shaft 2, and the first blade 20 is shown in FIG.
Is a continuous spiral shape supported by a plurality of prismatic arms 19, ... (Arranged at the position shown by the alternate long and short dash line in the figure) mounted so as to rotate radially by 45 degrees in the longitudinal direction of the kneading shaft 2. is doing.

On the other kneading shaft 2, as shown in FIG. 7, a second blade 22 composed of partial blades 22a to 22d obtained by dividing the above continuous spiral blade into four pieces.
Is provided. Each of these partial blades 22a-2
The arms 21 to which the 2d is attached are arranged so as to be offset from the original spiral position in the circumferential direction by a predetermined angle so that the partial blades 22a to 22d do not interfere with the first spiral blade 20. . In addition,
Of the partial blades 22a to 22d of the second blade 22, the two partial blades 22a and 22c are the three arms 21, ... And the other two partial blades 22b and 22d are the single arms 21 and 21, respectively. Installed.
Also, as shown in FIG. 8, each arm 19 (or 21)
Is attached so that each side of the quadrangular prism is inclined by 45 degrees with respect to the axial direction of the kneading shaft 2, and each blade 20 (or 2
2) is attached along one side of the arm 19.

Therefore, according to the present invention, the flexible piece portions 11 and 11 are bent in response to the operation of the pair of support members 14 and 14 connected to the pair of double door-shaped flexible piece portions 11 and 11, respectively.
The discharge port 13 of the kneading tank 1 is opened and closed.

In that case, in the H-shaped notch 10 forming the discharge port 13, the double-door-shaped flexible piece portions 11, 11 are integrally continuous with the elastic plate 5 formed of an elastic plate, and Since the outlets 13 are opened and closed by bending the flexible pieces 11 and 11 into a cantilever plate shape, there is no conventional hinge portion at the portion corresponding to the rotation axis of the door, and there is no foreign matter such as concrete or sand. There is no gap to bite. Further, the central cut line portion 8 and the side cut line portions 9 and 9 of the cut 10 have no step and are closed in a scissor shape. Therefore, the discharge port 13 can be opened and closed without the inclusion of foreign matter, and the sealing performance can be improved.

Furthermore, since the bottom of the kneading tank 1 is made of an elastic plate, it is easily peeled off from the kneading tank 1 even after the adhering and hardening of the green concrete, and after the use of the kneading tank 1, the discharge port 13 is opened. Since the discharge port 13 is gently elastically deformed into a V-shape, the effect of facilitating the cleaning operation in the kneading tank 1 can be obtained.

In addition to the above-mentioned effects, in the above-mentioned embodiment, the elastic members 5 are formed by the supporting members 14, 14 so that the shape of each of the kneading shafts 2, 2.
Since it is elastically deformed upward so as to come close to the trajectory drawn by the tips of the blades 20 and 22 of 2, the unmixed portion in the kneading tank 1 is almost eliminated, and uniform mixing of fresh concrete is possible, and the kneading performance is improved. Also has.

In the above embodiment, the H-shaped cut 10 has a shape in which the side cut line portions 9 and 9 are linear, but the cut 10 of the present invention is not limited to such a shape.
It can take various shapes. For example, FIGS. 9A to 9A
FIG. D shows a modified example of the above-described embodiment, and side cut line portions 9A, 9A extending to open outward as shown in FIG. 9A, side cut line portions 9B extending as closed inward as shown in FIG. 9B, 9
B, as shown in FIG. 9C, curved side cut line portions 9C, 9
C, side cut line portions 9D, 9D, etc. that extend straight in parallel at one end and then bend inward as shown in FIG. 9D may be formed from both ends of the center cut line portion 8.

In addition, in the above-described embodiment, almost the entire bottom of the kneading tank 1 is made of the elastic plate 5, but the lower part of the bottom may be made of the elastic plate 5. That is, the elastic plate 5 may be formed only below the axis of the kneading shaft 2 and at least outside the swing center of the bell crank 17.

Further, the notch 14 may be formed in a U-shape to form the discharge port 13 that opens and closes like a single door.

(Effects of the Invention) As described above, according to the present invention, in the biaxial concrete mixer, the bottom of the kneading tank is formed of the elastic plate,
Since a substantially H-shaped notch is provided at the center of the bottom and a pair of flexible pieces that open and close like a double door constitute the discharge port of the kneading tank,
The discharge port of the kneading tank can be formed without providing a hinge portion or a step, so that it is possible to effectively prevent foreign matter from being caught or leaked, and improve the sealing performance.

[Brief description of drawings]

1 is a front view of a twin-screw concrete mixer, FIG. 2 is a sectional view taken along line II-II of FIG.
3 is a plan view of the elastic plate, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a side view of one kneading shaft, FIG. 6 is a front view of FIG. 5, and FIG. The figure is a side view of the other kneading shaft, FIG. 8 is a view showing the attachment of the blade to the arm, and 9A to 9D.
Each of the figures is a diagram showing a modification of the shape of the cut. DESCRIPTION OF SYMBOLS 1 Kneading tank 2 Kneading shaft 5 Elastic plate 8 Central notch line part 9 Side notch line part 10 Notch 11 Flexible piece part 13 Discharge port 14 Support member

Claims (1)

[Scope of utility model registration request] 1. A twin-screw concrete mixer in which two parallel kneading shafts are provided inside the kneading tank, blades are arranged on each of the kneading shafts, and a discharge port is formed at the center of the bottom of the kneading tank. In, while the bottom of the kneading tank is composed of an elastic plate,
The elastic plate is composed of a central cutting line portion cut along the axial direction of the kneading shaft and side cutting line portions extending from both ends of the central cutting line portion to both sides of the kneading tank. A substantially H-shaped cutout is provided, and the openable / closable discharge port formed of a pair of double-door-shaped flexible piece portions is formed by the cutout. A concrete mixer comprising: a pair of supports that support each flexible piece portion and that bend the flexible piece portion to open and close an outlet.