JPS5924486Y2 - Concrete mixer car rotating drum - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of the rotating drum of a concrete mixer truck, and more specifically, to a rotating drum that prevents fresh concrete inside the rotating drum body from deteriorating in quality due to changes in temperature. It is something.

Generally, in the rotating drum of a concrete mixer truck, the main body of the rotating drum is made of a steel plate, and in order to reduce weight, the side wall of the rotating drum body is a single wall.

For this reason, the temperature inside the rotating drum body is easily affected by the outside air, and the quality of ready-mixed concrete poured into the rotating drum body tends to deteriorate.

In other words, in the summer, the rotary drum body is heated by direct sunlight, raising the temperature of the fresh concrete and stopping the solidification of the fresh concrete.For this reason, the fresh concrete that adheres to the inner walls and blades of the rotary drum body does not stick. This method is easy to remove, and requires a lot of work to peel off the hardened fresh concrete, which is very time-consuming.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a rotating drum in which ready-mixed concrete within the rotating drum body is not affected by changes in outside temperature.

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

Reference numeral 1 in FIG. 1 is a rotating drum, and as in the conventional case, a front abutment 4 and a rear roller pedestal 5 are installed on a subframe 3 of a concrete mixer vehicle body 2. It is rotatably supported through.

This rotating drum 1 has a rotating drum main body 6 that forms its main body.
It has a double structure including a cover member 7 surrounding the rotating drum main body 6.

The rotating drum main body 6 has a conical cylindrical shape that narrows as it approaches the mouth 8, as in the conventional case, and is made of a steel plate. is provided, and the fresh concrete fed from the hopper 9 provided at the upper end of the rear roller holder 5 is stirred by the blade.

On the other hand, the cover member 7 has a conical cylindrical shape like the rotating drum main body 6, and is made of a steel plate or synthetic resin.
The rotary drum main body 6 is accommodated therein, and a space 10 is formed between the inner surface of the cover member 7 and the outer surface of the rotary drum main body 6.

Further, a space 10 is provided on the front 7a side circumferential surface of the cover member 7.
An inflow hole 11 is formed that communicates with the space 10, and an outflow hole 12 that communicates with the space 10 is also formed on the peripheral surface of the rear part 7b, so that the outside air flowing in from the inflow hole 11 passes through the space 10 and flows into the outflow hole. 12 and cools the rotating drum main body 6 during summer or the like.

Note that the inflow hole 11 can be closed as necessary by a cover plate 13 attached to the cover member 7 by fastening means such as bolts.

However, 15 in the figure is a trunnion shaft,
One end is fixed to the center of the bottom 14 of the rotary drum main body 6, and the other end protruding from the front plate 16 of the cover member 7 is rotatably supported by the front support 4.

A drum roller 17 is rotatably provided on the rear roller holder 5 and supports a drum tire 18 provided on the entire circumferential surface of the rear 7b side of the cover member 7, thereby rotatably supporting the rotary drum 1. .

Reference numeral 19 denotes a drain hole formed on the peripheral surface of the front portion 7a of the cover member 7, which also functions as an air inflow hole.

20 is a driver's cab installed in the vehicle body 2.

The rotating drum of the concrete mixer truck according to the present invention has the above-mentioned structure, in which fresh concrete is put into the rotating drum body 6 from the hopper 9, and the rotating drum 1 is rotated in the normal direction around its center line l to collect the ready-mixed concrete. Rotating drum body 6
While the fresh concrete is transported while being stirred inside, when the fresh concrete is discharged to the outside at a construction site or the like, the rotary drum 1 is rotated in the opposite direction, which is the same as in the conventional method.

The rotating drum 1 of the present invention can be used in cases such as summer when the temperature of fresh concrete increases and solidification is accelerated.
The cover plate 13 is removed and the inlet hole 11 of the cover member 7 is opened.

In this way, while the concrete mixer truck is running, outside air flows into the space 10 from the inflow hole 11 and
0 and the outflow hole 12 on the rear 7b side of the cover member 7.
The liquid flows out from the rotary drum body 6 to cool the rotary drum body 6 and prevent the temperature of the fresh concrete within the rotary drum body 6 from rising.

Furthermore, even when the concrete mixer truck is stopped, if the rotary drum 1 is rotating, outside air enters and exits the space 10 through the inflow hole 11 and the outflow hole 12 due to the rotational action of the rotary drum 1, and heat is radiated. .

Therefore, the ready-mixed concrete does not harden quickly, and there is a risk that the ready-mixed concrete will stick to the inner surface of the rotating drum main body 6 and the blade (not shown) provided on the inner surface and harden during transportation of the ready-mixed concrete. It disappears.

Therefore, the work of peeling fresh concrete becomes easier, and the number of times of peeling work can be reduced.

According to the above embodiment, several relatively small inflow holes 11 are formed on the circumferential surface of the front portion 7a of the cover member, and outside air is introduced into the space 10 through the inflow holes 11. However, when the front plate 16 of the cover member 7 is made removable and outside air is introduced into the space 10, it is not necessary to remove the front plate 16 and open the front end face of the cover member 7. Good too.

Alternatively, the cover member 7 may extend to a position in front of the drum tire 18, omitting the rear part 7b, and open at a position in front of the drum tire 18, so that outside air is discharged from the opening.

As explained above, in the rotating drum of the present invention, a cover member is provided on the outer peripheral surface of the rotating drum body with a space formed between the cover member and the cover member in front of the cover member. The outside air inflow hole and the outflow hole are provided at the front and back of the drum, and the outside air is circulated through the space to dissipate heat, so that the ready-mixed concrete inside the rotary drum body will deteriorate due to an increase in the outside air temperature. There is no risk of quality deterioration.

In addition, since the rotating drum body is surrounded by a cover material, it is not exposed to direct sunlight, and there is no risk of the temperature inside the rotating drum body rising rapidly, especially in the summer. It can be transported up to.

Moreover, the running of the concrete mixer truck and the rotation of the rotary drum force the outside air into and out of the space, promoting heat dissipation.
It has the advantage of being rational and easy to implement.

[Brief explanation of the drawing]

The drawing shows an embodiment of a rotating drum of a concrete mixer truck according to the present invention, and is a partially cutaway side view. 6... Rotating drum body, 7... Cover member, 7a... Front part, 7b... Rear part,
10...Space part, 11...Inflow hole, 1
2...Outflow hole.

Claims (1)

[Scope of utility model registration request] A cover member 7 is provided on the outer peripheral surface of the rotary drum body 6, surrounding the rotary drum body 6 and forming a space 10 between the outer surface of the rotary drum body 6 and the inner surface of the cover member 7. The front part 7a of the cover member 7 is provided with an inflow hole 11 for allowing outside air to flow into the space 10, and the rear part 7b of the cover member 7 is provided with an inflow hole 11 for allowing outside air to flow into the space 10.
An outflow hole 12 through which the outside air that has flowed into the air flows out to the outside.
A rotating drum of a concrete mixer truck, characterized in that it is provided with: