JPS5842094Y2 - concrete mixer truck - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a concrete mixer truck.

As is well known, in a concrete mixer truck, fresh concrete is charged through a hopper 3 into a rotating drum 2 equipped with a blade (see FIG. 1) 1, and the rotating drum 2 is rotated in the forward direction (counterclockwise in FIG. 1). After transporting the fresh concrete while stirring it with the blade 1, the rotary drum 2 is rotated in the opposite direction (clockwise in Fig. 1), and the action of the blade 1 transports the fresh concrete from the open end into the fixed chute 4. It is being discharged.

By the way, in the above operation, there is no particular problem in the case of high-slump ready-mixed concrete with good fluidity, but in the case of low-slump ready-mixed concrete, the fluidity is poor, so as shown in Figure 1, the ready-mixed concrete There is a drawback that C becomes lumpy and falls into the chute 4, clogging it.

The above-mentioned clogging phenomenon is caused by the fact that low slump fresh concrete (C) discharged from the rotating drum 2 by the action of the blade 1 is caused by the rotation of the rotating drum 2 at the rising side U of the rotating drum 2 when the rotating drum 2 rotates in reverse. Careful observation revealed that the cause was that after rising a little following 2, it fell in large chunks onto the side wall 4a of the fixed chute 4 and slid down the side wall 4a at a low speed. did.

This idea was made based on the above knowledge, and is a concrete mixer truck that can smoothly discharge not only high-slump ready-mixed concrete but also low-slump ready-mixed concrete with poor fluidity without clogging the chute. The purpose is to provide

This invention will be explained below with reference to the drawings.

2 to 4 show an embodiment of this invention, and 11 is a truck body.

This truck body 11 includes steering wheels 12 and driving wheels 13.
A driver's seat 15 is provided at the front of a chassis 14 equipped with a driver's seat 15, and a subframe 16 is provided at the rear of the chassis 14. There is.

On the subframe 16 of the truck body 11, a center shaft 18 with a rotating drum 17 provided at the bottom is pivotally connected to a bearing 19 on the subframe 16.
The opening is supported by two guide wheels 20 and is mounted rotatably in the circumferential direction.

This rotary drum 17 is used to mix fresh concrete and is equipped with a spiral blade 21 inside, and is rotated by the drive device of the truck body 11 via a hydraulic pump, a hydraulic motor, etc. There is.

Fresh concrete is charged into the rotating drum 17 through a well-known charging cylinder located at the open end of the rotating drum 17 and attached to a blade 21 to the frame member 16a erected at the rearmost part of the subframe 16. A hopper 22 and a fixed chute 23 are provided for receiving fresh concrete discharged from the open end of the rotary drum 17 by a blade 21 as the rotary drum 17 rotates in the opposite direction (clockwise in FIG. 4).

This fixed chute 23 is arranged so that the center A of its discharge portion 23C is located on the left side in FIGS. fixed to the frame member 16a of the subframe 16 while being shifted to the rotation rising side U at the time,
It is connected to a movable chute 25 rotatably supported by the subframe 16 by a rotation support member 24, and
The inclination angle α of the side wall (sliding surface) 23a on the upward rotation side U is larger than the inclination angle β of the side wall 23b on the downward rotation side.

In the above configuration, the peripheral speed at the open end of the rotating drum 17; 0.03 to 0.2 m/sec, ° the rotating drum 17
Displacement width W of the center A of the discharge portion 23C of the chute 23 with respect to the center B of the chute 23; 100 to 300 mm, inclination angle α of the side wall 23a; 47 to 53°, inclination angle β of the side wall 23b; 30
The range of ~3T is the most common.

Next, the operation of the concrete mixer truck according to this invention will be explained.

The operation of the concrete mixer truck of this invention is the same as that of the conventional concrete mixer truck as well as its basic main structure.

That is, fresh concrete is put into the rotating drum 17 via the hopper 22, and the rotating drum 17 is rotated in the counterclockwise direction in FIGS. 3 and 4, and the fresh concrete is mixed and stirred with the blade 21. The fresh concrete in the rotary drum 17 is discharged to the outside from the open end by rotating the rotary drum in the opposite direction at the concrete placement site.

In the above, if the fresh concrete has a low slump and poor fluidity, the fresh concrete follows the rotation of the rotating drum 17 and rises a little on the rising side U of the rotating drum, and then falls downward, but a shoot occurs just at the falling part. Since the center of the discharge part 23C of 23 is present, it slides down this part with great force.

Even if the fresh concrete 1 deviates slightly from the center of the discharge section 23C of the chute 23, the degree of deviation is less than that of the conventional system in which the center of the chute was aligned with the center of the rotating drum (see Figure 1). It is very small and there may be side walls 23
Since the inclination angle α of a is increased, the chute 23
There is no chance of getting stuck.

In the case of high slump fresh concrete, the fresh concrete is discharged on the descending side of the rotation and falls onto the side wall 23b of the chute with a small inclination angle β, but because of its good fluidity, there is no clogging even in this case. .

As described above, the fresh concrete in the rotating drum is smoothly discharged to the outside, but if the movable chute 25 is stored in the right direction (as shown in FIG. 3) when traveling, the drum center B and the movable chute 25 If the movable chute can be lengthened by the distance W from the center A of the rotational support member 24, and you want to send fresh concrete as far away from the mixer truck as possible, the movable chute 25 can be rotated around the side of the vehicle body on the rotating upward side U. By moving the chute, the movable chute can be delivered 2XW farther than before.

When the concrete mixer truck runs, the movable chute 25 is rotated in the downward rotation direction, contrary to the above.

As explained above, according to this invention, even fresh concrete with low slump and poor fluidity can be smoothly discharged without clogging the chute.

In addition, the movable chute can be installed at a high position as before, so there is no problem, and by rotating the movable chute toward the upward rotation side and protruding its tip to the side of the car body, it can be moved away from the mixer truck. It is very convenient to feed fresh concrete directly to the location where the mixer truck is moving, and by rotating the movable chute in the downward rotation direction, it is possible to prevent the movable chute from protruding to the side of the vehicle body. It has the great advantage of not causing any problems, and its practical value is enormous.

[Brief explanation of drawings]

Figure 1 is a schematic rear view showing the relationship between the rotating drum and chute of a conventional concrete mixer truck, and Figure 2 and the following diagrams show one embodiment of this invention. A side view, FIG. 3 is a rear view showing the relationship between the rotating drum and the chute, and FIG. 4 is a schematic rear view of the same. 14... Chassis, 17... Rotating drum, 21... Blade, 22... Hopper, 23... Chute, 23a, 23b. ...
...Side wall, A...center, U...rotation rising side, D...rotation descending side, α, β...
Tilt angle.

Claims (2)

[Scope of utility model registration request] (1) A rotating drum with blades on the inner circumferential surface is mounted on the chassis, and at the open end of this rotating drum there is a hopper for feeding fresh concrete into the rotating drum, and when the rotating drum rotates in reverse, it is raked up by the blades. In a concrete mixer truck equipped with a chute for receiving fresh concrete discharged from the open end of a rotating drum, the chute is provided with its center position shifted to the rising side of rotation when the rotating drum rotates in reverse. Characteristic concrete mixer truck. (2) Utility model registration claim 1, characterized in that the inclination angle of the side wall of the chute on the rising side of rotation is made larger than the inclination angle of the side wall of the chute on the falling side of rotation when the rotating drum rotates in reverse. concrete mixer truck.