JPS58497Y2 - Concrete mixer car rotating drum - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotating drum provided in a concrete kisser truck.

Generally speaking, in concrete □ kisser trucks, after work is completed, it is necessary to wash the rotating drum with water to remove the ready-mixed concrete adhering to the inside.

Conventionally, the above-mentioned washing with water has been carried out by filling a rotating drum with water and rotating the drum at high speed, but it is difficult to completely wash away the adhering concrete, so each time the rotating drum is used, As the concrete hardens, it gradually increases in volume.

For this reason, concrete that has hardened and adhered to the inside of the rotating drum is periodically peeled off using a peeling tool such as a rock drill, but this peeling work is laborious and time-consuming, especially on the mouth side of the rotating drum. It is tapered into a conical shape and is narrower than other parts, and furthermore, a charging cylinder is attached to the mouth side, making peeling work extremely difficult.

In addition, since there is a tunnel-like shape between the charging cylinder and the inner wall surface on the rotary drum mouth side, it is necessary to peel off the hardened concrete that has adhered to the mouth side of the rotary drum using a peeling tool from inside the charging cylinder. is not possible.

This invention was made in view of the above-mentioned circumstances, and the object thereof is to provide a rotating drum for a concrete mixer truck that allows easy peeling of adhered and hardened concrete.

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

Reference numeral 1 in FIGS. 1 and 2 is a rotary drum body, and a blade 3 is spirally provided on the inner surface of the rotary drum body 1 extending from the bottom (not shown) to the mouth 2. As shown in FIG.

A cylindrical charging cylinder 4 is detachably supported by grade 3 and attached to the mouth 2 of the rotating drum body 1.

To explain this in detail, the blade portion 3a located at the end of the mouth portion 2 of the rotary drum body 10 has a tightening means 5 such as a bolt.
A flexible member 6 made of a rubber piece or the like having a substantially 1/4 arc shape is fixed thereto.

On the other hand, a bolt mounting hole T is formed in the outer peripheral surface of the charging cylinder 4 at a position facing the flexible member 6, and a headed bolt 8 inserted into the bolt mounting hole I is formed in the rubber piece 6. It passes through a hole 9 and is connected by a nut 10.

(See FIG. 2) Therefore, by removing the nut 10 and pulling out the headed bolt 8 from the hole 9 and the bolt attachment hole T, the charging cylinder 4 can be removed from the rotating drum body 1.

Here, the flexible member 6 allows the charging cylinder 40 to freely move in the radial direction.

Further, a gap a is provided between the charging cylinder 4 and the blade 3 to the extent that fresh concrete does not pass through, and the charging cylinder 4 is connected to the rotating drum body 1.
When installing the charging cylinder 4 in the zero opening part 2, the charging cylinder 4 can be moved in the radial direction so that the center axis of the charging cylinder 4 can be easily adjusted to match the center line of rotation of the rotating drum body 10. It looks like this.

In the figure, reference numeral 11 indicates a fixed hopper, and reference numeral 12 in the figure indicates a hopper seal provided on the fixed hopper 11, which is inserted into the inlet end of the charging cylinder 40.

Further, reference numeral 13 in the figure is a discharge passage formed between the inner wall surface of the rotating drum main body 1 and the outer surface of the charging cylinder 4.

The rotating drum of the concrete mixer truck according to this invention has the above-mentioned configuration, and the fresh concrete is transferred to the fixed hopper 11. It is placed into the rotating drum body 1 via the hopper seal 12 and the charging cylinder 4, the rotating drum body 1 is rotated in the normal direction, and the fresh concrete is transported to the construction site while being stirred by the blade 3. 1 is reversed and the fresh concrete is discharged from passage 1 by blade 3.
3. The liquid is discharged from the mouth 2, which is the same as the conventional method.

Next, to explain the method of peeling off the hardened concrete that has adhered to the rotary drum body after it has been used for transporting fresh concrete, first remove the nut 10 from the headed bolt 8, and then insert the headed bolt 8 into the hole 9. , and remove it from the bolt mounting hole γ.

Next, the charging cylinder 4 is once removed from the mouth 2 of the rotary drum body 10, and in this state, the inner surface of the rotary drum body 1 and the blade 3 are removed using a peeling tool such as a drilling tool.
Peel off hardened concrete that adheres to the surface.

At this time, even though the opening 2 side of the rotary drum body 1 is narrow, since the charging cylinder 4 is removed, the peeling work can be carried out sufficiently without being hindered by the charging cylinder 4.

Note that the charging cylinder 4 can be removed from the blade 3 together with the flexible member 6 by loosening the tightening means 5 such as a bolt.

After performing the peeling work as described above, put the charging cylinder 4 into the rotary drum main body 10 opening 2 again, insert the headed bolt 8 into the bolt mounting hole γ and the hole 9, and screw the nut 10. The charging cylinder 4 is attached by tightening.

According to the above embodiment, the charging cylinder 4 is connected to the blade portion 3a by the headed bolt 8 and the nut 10.
Since the charging cylinder 4 is supported by the concrete, the charging cylinder 4 for peeling off the hardened concrete can be easily and quickly removed.

Furthermore, since the charging cylinder 4 is supported by the grade 3 via the flexible member 6, even if the rotating drum main body 1 swings while the concrete mixer truck is running, this swing will be caused by the flexible member 6. is absorbed by the elastic deformation of the charging cylinder 4, and is not transmitted from the charging cylinder 4 to the hopper seal 12.
No unbalanced load acts on the hopper seal 12.

Therefore, the life of the hopper seal 12 becomes longer than in the conventional case, and the sealing performance between the hopper seal 12 and the char sink cylinder 4 is also improved.

Furthermore, since there is a gap a between the charging cylinder 4 and the blade 3, when installing the charging cylinder 4, it is difficult to align the center axis of the charging cylinder 4 with the rotation center line of the rotating drum body 1. It becomes easier.

Furthermore, since the gap a is set to such an extent that fresh concrete does not pass through, there is no risk that fresh concrete will enter the discharge passage 13 unnecessarily.

As explained above, in the rotating drum of this invention, the charging cylinder has a gap between it and the grade.
In addition, since the charging cylinder is detachably supported by the blade via a flexible member that allows free movement in the radial direction, it is easy to perform concrete peeling work without removing the charging cylinder. In particular, the concrete peeling work on the mouth side of the rotary drum body, which has been considered difficult in the past, becomes easier, and therefore the efficiency of the concrete peeling work is greatly improved and the burden on the worker is reduced.

Moreover, as mentioned above, the charging cylinder can freely move in the radial direction due to the formation of a gap with the flexible member, so while the concrete mixer truck is running, it can easily move due to unevenness of the road surface (=1), curves, sudden braking, etc. Even if the rotating drum body were to oscillate due to such reasons, the oscillation would be absorbed by the elastic deformation of the flexible member and would not be transmitted from the charging cylinder to the hopper seal, resulting in an unbalanced load on the hopper seal. This has the advantage that the hopper seal has a longer lifespan since it does not act.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a sectional view of the main part, Fig. 2 is an enlarged view of part A in Fig. 1, and Fig. 3 is an end view of the mouth of the rotating drum body. It is. 1... Rotating drum body, 2... Mouth part,
3...Blade, 4...Charging cylinder, 16...Flexible member, a...
·gap.

Claims (1)

[Scope of utility model registration request] Rotation of a concrete mixer truck in which a blade is spirally provided on the inner surface of the rotating drum body from the bottom to the mouth of the rotating drum body, and a charging cylinder is attached to the mouth of the rotating drum body so as to be supported by the blades. In the drum, the charging cylinder is detachably supported by the blade via a flexible member that provides a gap between the charging cylinder and the blade and allows the charging cylinder to move in the radial direction. The rotating drum of a concrete mixer truck.