JP2525855Y2 - Concrete mixer - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a concrete mixer which prevents the ready-mixed concrete from adhering to the end plate and prevents the ready-mixed concrete component near the end plate from separating. .

(Conventional technology) When constructing a structure that requires a large amount of ready-mixed concrete, it is common to knead and manufacture ready-mixed concrete in advance at a factory or the like and transport it to the construction site using a concrete mixer mounted on a vehicle. is there.

Usually, in this type of concrete mixer, in order to prevent the ready-mixed concrete from solidifying during transportation, a kneading / discharging blade is spirally provided in the drum, and the drum is rotated to knead the ready-mixed concrete. (See, for example, Japanese Patent Publication No. 54-40771).

However, if the ready-mixed concrete is simply kneaded by a spiral blade, the ready-mixed concrete near the center of the drum and near the opening, that is, most of the ready-mixed concrete is stirred and kneaded by the blade while rotating together with the drum due to its viscosity. The ready-mixed concrete in the vicinity is difficult to stir, the fluidity of the ready-mixed concrete is reduced, and the ready-mixed concrete is liable to adhere to and accumulate on the end plate. When the ready-mixed concrete is discharged, it remains in the drum and must be discharged manually.

Therefore, in the conventional concrete mixer, for example,
As shown in JP-A-57-40180, a shaft is erected on the inner surface of the end plate, an arm is rotatably supported on the shaft, and a scraping part and a resistance part are attached to the arm. When high-grade ready-mixed concrete is discharged to some extent and the pressure received by the scraper increases relative to the pressure received by the resistor,
A method has been proposed in which the scraping unit is rotated by the rotation of the ready-mixed concrete, and the ready-mixed concrete adhering to the end plate is automatically scraped and discharged.

(Problem to be Solved by the Invention) However, in the method described in the above-mentioned conventional publication, the ready-mixed concrete adhering to the head plate is scraped off at the time of discharge, so that the ready-mixed concrete near the head plate does not flow during transportation, There is a problem that the components are separated and it is difficult to use them for casting a structure.

Of course, the ready-mixed concrete near the end plate is stirred during transportation,
Prevents the adhesion and deposition of ready-mixed concrete,
It is preferable to prevent the separation of components, but in this case, if a stirring plate is provided on the end plate and the stirring is performed, the structure near the end plate becomes complicated, and ready-mixed concrete adheres and accumulates on the back side of the plate, and is washed with water. Is also difficult to remove,
The fact is that the removal is very complicated and is not employed in actual mixers.

It is an object of the present invention to provide a concrete mixer that can prevent the ready-mixed concrete from adhering to the end plate with a simple structure in such a situation, and can prevent the raw concrete near the end plate from separating components.

(Means for Solving the Problems) Accordingly, a concrete mixer according to the present invention is described as follows. "A drum is provided by providing a head plate at one end of a cylindrical body, and a spiral blade is mounted in the drum. In a concrete mixer in which ready-mixed concrete is stirred and kneaded by means of a blade, a plurality of stirring rods are respectively erected on the inner surface of the head plate at different distances from the center of rotation of the head plate, and the head plate is rotated by the plurality of stirring rods when the drum rotates. The nearby ready-mixed concrete was stirred and kneaded. "

Here, the stirring rod may have any shape,
A shape that hardly adheres to ready-mixed concrete, for example, a round bar is preferable. In addition, it is preferable that the length of the stirring rod is substantially equal to the thickness of the ready-mixed concrete layer adhering and depositing on the end plate, and that the stirring rod be capable of stirring substantially the entire ready-mixed concrete layer. Since it differs depending on the number of bars, it is preferable to obtain the value in advance through experiments or the like.

(Operation) In the present invention, since a plurality of stirring rods are erected on the inner surface of the end plate, the plurality of stirring rods stir the ready-mixed concrete near the end plate when the drum rotates, and furthermore, each stirring rod is connected to the center of rotation of the end plate. Because it is erected at a different distance from the head, almost the whole of the ready-mixed concrete near the head plate is stirred, and thus the ready-mixed concrete near the head plate is sufficiently kneaded, its adhesion and deposition is prevented, and the fluidity is ensured. Is prevented from being separated.

In addition, since the stir bar is used for kneading the ready-mixed concrete near the end plate, there are no multiple structures near the end plate,
Ready-mixed concrete hardly adheres to the stirring rod, and complicated removal work is unnecessary.

(Example) Hereinafter, the present invention will be described in detail based on a specific example shown in the drawings.

1 to 3 show a concrete mixer according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a drum mounted on a vehicle. Although not shown, the drum 1 is inclinedly supported by a front end bearing and a rear guide roller and is rotated by a driving mechanism.

The drum 1 comprises a cylindrical body 10 having a large diameter in the center, a head plate 11 is provided at the front end of the cylindrical body 10, and a rear end opening 12 of the cylindrical body 10 is made of ready-mixed concrete. It is the input and output port of

A kneading / discharging blade 13 is provided in the cylindrical body 10.
Are spirally mounted.

On the inner surface of the end plate 11, three stirring rods 2 are erected at equal angular intervals, that is, at approximately 120 ° intervals. The stirring rods 2 are configured by using round rods having a diameter of 30 cm and a length of 30 cm. Each stirring rod 2 has a different distance a from the rotation center A of the end plate 11.
It is fixed to b and c by welding.

 Next, the operation and effect will be described.

When transporting ready-mixed concrete, ready-mixed concrete 3 is accommodated in the drum 1 from the charging / discharging port 12, and the drum 1 is rotated. Then, the ready-mixed concrete 3 rotates together with the drum 1 due to its viscosity, and most of the mixture 30 is stirred by the spiral blade 13.

On the other hand, the three stirring rods 2 rotate with the rotation of the drum 1, and each of the stirring rods 2 stirs the ready-mixed concrete 31 near the end plate 11 at different positions, and substantially the entire stirrer is stirred.
In this way, the whole of the ready-mixed concrete 3 in the drum 1 is sufficiently stirred and kneaded, its fluidity is ensured, and separation of components is prevented.

When arriving at the construction site and discharging the ready-mixed concrete 3, the drum 1 may be rotated in the reverse direction, and the spiral blade
The ready-mixed concrete 3 in the drum 1 is extruded and discharged by 13.

In the concrete mixer of the present embodiment as described above, since three stirring rods 2 are erected on the inner surface of the end plate 11, the three stirring rods 2 rotate with the rotation of the drum 1 during transportation, so that the raw material near the end plate 11 is produced. Since the concrete 31 can be agitated and the stirring rods 2 are provided at different distances a, b, and c from the rotation center A of the end plate 11, substantially the whole of the ready-mixed concrete 31 near the end plate 11 can be stirred. As a result, the ready-mixed concrete 31 in the vicinity of the end plate 11 can be sufficiently stirred and kneaded, and its adhesion and deposition can be prevented beforehand, and its fluidity can be ensured to prevent separation of components, thereby improving the yield of the ready-mixed concrete 3.

In addition, in this concrete mixer, the mixing rod 2 made of a round bar is used for kneading the ready-mixed concrete 31 near the end plate 11, so that the structure near the end plate 11 is very simple. As a result, complicated removal work is unnecessary and the inside of the drum 1 can be washed by a simple washing operation.

(Effects of the Invention) As described above, according to the concrete mixer of the present invention, a plurality of stirring rods are erected at different positions from the center of rotation on the inner surface of the end plate, and the end plate is rotated by the plurality of stirring rods when the drum rotates. Since the nearby ready-mixed concrete is stirred and kneaded, there is an effect that it is possible to prevent the adhesion of the ready-mixed concrete to the end plate and prevent the separation of the ready-mixed concrete component without complicating the structure.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a concrete mixer according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view showing the concrete mixer, and FIG. 3 is a front view showing the vicinity of a mirror surface of the concrete mixer. It is. 1 ... drum, 10 ... cylindrical body, 11 ... head plate, 13 ... spiral blade, 2 ... stirring rod, 3 ... ready-mixed concrete,
31 ... Fresh concrete near the mirror plate.

Claims (1)

(57) [Scope of request for utility model registration] 1. A drum 1 is provided by providing a head plate 11 at one end of a cylindrical body 10, and a helical blade 13 is mounted in the drum 1. When the drum 1 rotates, the ready-mixed concrete is formed by the helical blade 13. In a concrete mixer in which 30 is stirred and kneaded, a plurality of stirring rods 2 are erected on the inner surface of the end plate 11 at different distances a, b and c from the rotation center A of the end plate 11, respectively. A concrete mixer characterized in that the ready-mixed concrete 31 near the head plate 11 is stirred and kneaded by the plurality of stirring rods 2 during rotation.