JPH0516721A - Exfoliating device for concrete stuck on inside face of drum - Google Patents

Abstract

PURPOSE:To exfoliation and remove the concrete stuck on the inside face of a drum efficiently and safely without getting into the drum. CONSTITUTION:An exfoliating device for the concrete stuck on the inside face of a drum is equipped with the drum 5 of a concrete mixer and a wave guide 8 which introduces microwaves into the drum 5, and a plurality of radiation parts 9 are formed on the wave guide 9, and electromagnetic waves are radiated towards the inside face of the drum 5 in revolution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing concrete adhered in a drum, which removes concrete adhered to the inner peripheral surface of a concrete mixer without manpower.

[0002]

2. Description of the Related Art Since a concrete mixer truck conveys fresh concrete in a rotating drum while stirring it, the raw concrete gradually adheres to the inner peripheral surface of the drum in layers during stirring. If the drum is used for several months, the concrete adhering to the inner peripheral surface of the drum may interfere with the stirring efficiency or may significantly deteriorate the discharge performance, resulting in the inconvenience that the concrete mixer cannot perform its original function. ..

On the other hand, in order to eliminate such a conventional inconvenience, at present, a worker enters a drum which is stopped at regular intervals and is fixed to the inner peripheral surface of the drum by using a tool such as a chisel and a hammer. Peeling work is performed to remove concrete by applying mechanical shock.

[0004]

However, since such conventional chipping work needs to be performed in various postures in the drum, which is a narrow working space, the concrete dust generated in the chipping work due to heavy labor is required. The adverse health effects on the human body due to inhalation are unavoidable,
Furthermore, since overhead hanging work cannot be performed, the drum must be rotated in the working area, which poses a problem such as danger.

In the above-mentioned chipping work inside the drum, the drum may abnormally reverberate, resulting in abnormal hearing, and the desired chipping work is not sufficiently performed due to poor workability due to manpower or a shortage of workers. There was a problem such as not being understood.

The present invention has been made by paying attention to the above problems, and a drum capable of efficiently and reliably peeling and removing concrete adhering to the inner peripheral surface of a drum without a person entering the drum. An object is to provide a peeling device for internally fixed concrete.

[0007]

A device for separating fixed concrete in a drum according to the present invention comprises a drum of a concrete mixer and a waveguide for introducing microwaves into the drum, and a plurality of waveguides are provided in the waveguide. Is provided so as to radiate electromagnetic waves toward the inner peripheral surface of the rotating drum.

[0008]

The radiating portion in the present invention radiates the microwave introduced through the waveguide toward the inner peripheral surface of the concrete mixer, and causes the microwave to be reflected, transmitted and absorbed by the inner peripheral surface. Cause body material to generate heat. Therefore, the concrete adhered to the inner peripheral surface of the drum receives stress due to the expansion of crystals and other components,
Finally, it is destroyed and peels off from the inner peripheral surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. In FIG. 1, reference numerals 1 and 2 denote mounting frames provided on a vehicle 3, and these mounting frames 1 and 2 are concrete mixers. A drum 5 is rotatably supported by the support shaft portion 4 and a drum receiving portion (not shown).

Reference numeral 6 denotes a cover that closes the upper opening of the drum 5, and is attached to the frame 2 side with a minute gap 7 as a choke for preventing electric wave leakage from the opening edge of the drum 5. There is.

Therefore, the drum 5 is rotatable with respect to the fixed cover 6. The gap 7 is set to a predetermined size calculated so that the microwave radiated into the drum 5 does not leak.

Reference numeral 8 denotes a waveguide, which is formed to have an inner width dimension for efficiently propagating a microwave having a predetermined frequency exceeding the cutoff frequency, which penetrates through the center of the cover 6 and which is one opening end of radiation. The portion 9 faces a predetermined center position in the drum 5 in the axial direction. The waveguide 8 and the cover 6 are hermetically sealed at their penetrating portions, and the waveguide 8 is also fixed to the frame 2.

On the other hand, the other end of the waveguide 8 is coupled to the magnetron 10, and the microwave (electromagnetic wave) generated by the magnetron 10 is received and radiated from the radiating portion 9 into the drum 5. Acts like.

Reference numeral 11 is a power source for driving the magnetron 10, and 12 is a blade for kneading fresh concrete provided on the inner peripheral surface of the drum 5, which is composed of, for example, a continuous screw plate.

Next, the operation will be described. First, when the power switch is turned on, electric power is supplied from the power supply unit 11 to the magnetron 10.

For this reason, the magnetron 10 emits an electrode from the cathode, rotates it with a magnetic field between it and the anode, generates an induced voltage of microwaves in the cavity of the anode, and guides the microwaves to the waveguide 8. Send to.

The microwave introduced into the waveguide 8 is
Further, it is radiated to the inner peripheral surface of the rotating drum 5 from the radiating portion 9 which is one opening end thereof, and uniformly collides with the entire inner peripheral surface of the drum 5 and the blade 12 and repeats reflection, or transmission / absorption. The dielectric material in the concrete is heated.

Due to this heat generation, the crystal water and other components in the concrete 20 adhered to the inner peripheral surface of the drum 5 after discharging the fresh concrete expands, destroying the concrete 20 itself, and the drum 5 Peel off one after another from the inner peripheral surface.

Therefore, after performing such an operation for a predetermined time,
By removing the peeled concrete 20 by removing the cover 6, the inner peripheral surface of the drum 5 can be cleaned cleanly.

As a result, when fresh concrete is newly produced by newly added cement or gravel, it is possible to perform sufficient kneading again and smoothly discharge the fresh concrete corresponding to the above-mentioned input amount. ..

FIG. 2 shows another embodiment of the present invention. In this embodiment, the waveguide 8 is extended deeper into the drum 5 and its tip is provided at the center of the bottom of the drum 5. Further, the waveguide 8 is supported by the rotary bearing 13, and the waveguide 8 is provided with a plurality of radiation portions 9A that radiate microwaves toward the inner peripheral surface of the drum 5 at a plurality of positions in the axial direction.

According to this embodiment, microwaves are emitted from the radiating portions 9A at a plurality of locations near the center axis of the drum 5 to the drum 5.
Since it can be radiated toward the inner peripheral surface of the drum 5, microwaves can be uniformly radiated to the entire inner peripheral surface of the drum 5 due to the rotation of the drum 5.

Therefore, the concrete 20 adhered to the inner peripheral surface can be more efficiently peeled off.

In the above peeling device, it is necessary to provide a minute gap 7 between the fixed portion and the rotating portion to allow the rotating portion to rotate. As shown in FIG. When the cover 6 is hermetically fixed to the opening of the waveguide, the waveguide 8 attached to the frame 2 has a minute gap 7A.
This waveguide 8 is inserted through the central hole 6a of the cover 6 so that
Need to penetrate inside.

Further, as shown in FIG. 4, if the waveguide is divided into waveguides 8A and 8B and these are connected through a minute gap 7B and a bearing 14, the waveguides 8A and 8B
The cover 6 and the drum 5 can be integrally connected, and thus they can be freely rotated with respect to the waveguide 8B attached to the frame 2. The gaps 7, 7A, 7B form chokes that prevent microwaves from leaking to the outside.

[0026]

As described above, according to the present invention, the concrete mixer drum and the waveguide for introducing microwaves are provided in the drum, and the waveguide is provided with a plurality of radiating portions. Since it is configured to radiate electromagnetic waves toward the inner peripheral surface of the rotating drum, concrete adhered to the inner peripheral surface of the drum can be safely and reliably protected from damage to the drum and without human intervention. Therefore, there is an effect that it can be removed, and therefore, it is possible to avoid the danger and obstacle to the human body and to efficiently perform the removal work.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an apparatus for removing concrete adhered in a drum according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a device for removing fixed concrete in a drum according to another embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing another installation structure of the minute gap according to the present invention.

FIG. 4 is a schematic cross-sectional view showing still another installation structure of minute gaps in the present invention.

[Explanation of symbols]

 5 Drum 8 Waveguide 9 Radiator 20 Concrete

Claims (1)

Claim: What is claimed is: 1. A drum of a concrete mixer, a waveguide for introducing microwaves into the drum, and a waveguide provided on the waveguide and directed toward the inner peripheral surface of the rotating drum. Peeling device for fixed concrete in a drum, which has a radiating section that radiates electromagnetic waves.