JP3182550B2 - Concrete peeling device in the drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing concrete fixed in a drum, which removes the concrete fixed on the inner periphery of a concrete mixer without manual intervention.

[0002]

2. Description of the Related Art A concrete mixer truck transports ready-mixed concrete in a rotating drum while stirring the mixture. During the stirring, the ready-mixed concrete gradually adheres to the inner peripheral surface of the drum in a layered manner. If the drum is used for several months, the concrete adhered to the inner peripheral surface of the drum may hinder the stirring efficiency or significantly deteriorate the discharge performance, and may not be able to perform the original function of the concrete mixer. .

On the other hand, in order to solve such a conventional inconvenience, at present, an operator periodically enters a stopped drum, and is fixed to the inner peripheral surface of the drum using a tool such as a chisel or a hammer. The concrete is peeled off by applying a mechanical shock or the like.

[0004]

However, since such a conventional hanging operation needs to be performed in various positions in a drum, which is a narrow working space, it involves heavy labor, and concrete dust generated by the hanging operation is removed. The inevitable adverse health effects on the human body due to inhalation,
Furthermore, since the overhead hanging work cannot be performed, the drum must be divided into work areas and rotated, which poses a problem that involves danger.

[0005] In the above-mentioned hanging work in the drum, the drum may reverberate abnormally, resulting in a hearing problem. Due to poor workability by humans and a shortage of workers, the intended hanging work is sufficiently performed. There were issues such as not being able to do it.

The present invention has been made in view of the above-mentioned problems, and a drum capable of efficiently and reliably peeling and removing concrete adhering to an inner peripheral surface of a drum without a person entering the drum. It is an object of the present invention to provide a device for removing internally fixed concrete.

[0007]

In order to achieve the above-mentioned object, the present invention provides a concrete mixer comprising a center shaft having a center rod or a screw rod installed at the center of a drum of a concrete mixer, and a rotation about a center shaft. It consists of a magnetron that is inserted in a freely movable manner in the axial direction while being regulated, and a waveguide that has a radiating part that projects radially from the magnetron and faces the inner peripheral surface of the drum at the open end. The microwave is radiated from the radiating portion of the waveguide toward the inner peripheral surface of the drum while the magnetron is moved in the axial direction in conjunction therewith.

[0008]

The magnetron according to the present invention moves in the axial direction in the drum in accordance with the rotation of the drum. Therefore, the radiating portion of the waveguide provided integrally with the magnetron moves the inner peripheral surface of the drum close to the radiating portion. The microwave can be applied to the whole of the drum substantially uniformly, so that the heat of the dielectric substance is caused to all of the concrete adhered to the inner peripheral surface of the drum, and the concrete is efficiently transferred to the inner peripheral surface of the drum. Promotes peeling from the surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numerals 1 and 2 denote mounting frames provided on a vehicle 3; A drum 5 is supported rotatably about the support shaft 4.

Reference numeral 6 denotes a cover for closing the upper opening of the drum 5, which is attached to the frame 2 via a minute gap 7 as a choke for preventing the radio wave from leaking from the opening edge of the drum 5. I have.

Accordingly, the drum 5 is rotatable with respect to the fixed cover 6. Note that 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 center rod serving as a central shaft, the upper end of which is fixedly attached to the frame 2 and the lower end of which is supported by a rotary bearing 9 provided at the center of the bottom of the drum 5.

Therefore, the center rod 8 is attached to the cover 6.
Through the center of the Note that the cover 6 is hermetically connected at a penetrating portion of the center rod 8.

Reference numeral 10 denotes a magnetron slidably mounted in the axial direction with respect to the center rod 8. A magnetron 11 is provided so as to protrude in the radial direction. Is a radiating portion 12 facing the inner peripheral surface of the drum 5.

Reference numeral 13 denotes a lead wire for supplying drive power to the magnetron 10, and reference numeral 14 denotes a bifurcated guide member projecting from the outer periphery of the magnetron 13.
Are positioned so as to sandwich the blade 15 provided in a screw shape on the inner periphery of the drum 5 from both side surfaces. Reference numeral 16 denotes concrete laminated and fixed on the inner peripheral surface of the drum 5.

Next, the operation will be described. First, power is supplied to the magnetron 10 via a lead wire 13 from a power supply unit (not shown) by turning on a power switch.

Before and after the supply of the electric power, the drum 5 after the discharge of the ready-mixed concrete is rotated.

With this rotation, the blade 15 also rotates, and the blade 15 urges the guide member 14 so as to press it downward or upward.

For this reason, the magnetron 10 integrated with the guide member 14 can move up and down in the axial direction along the center rod 8.

That is, the rotation of the drum 5 in one direction causes the magnetron 10 to move axially upward in the drum 5, and the rotation of the drum 5 in the other direction causes the magnetron 10 to move downward in the axial direction.

On the other hand, the magnetron 10 supplies the microwaves generated as described above to the waveguide 11 during the reciprocating motion on the center rod 8, and the microwaves are supplied from the radiating section 12 to the rotating drum. 5 is radiated toward the inner peripheral surface.

For this reason, the microwaves are highly efficient in close proximity to the entire inner peripheral surface of the rotating drum 5 and cause the dielectric substance of the concrete 16 fixed to the inner peripheral surface of the drum 5 to generate heat. .

For this reason, the crystallization water and other substances in the concrete 16 cause thermal expansion, which is destroyed by the expansion of the concrete 16 itself, and is quickly separated from the inner peripheral surface of the drum 5. .

In this case, in order to prevent the magnetron 10 from being dragged by the blade 11 and rotated, the magnetron 10 is caused to travel along a linear keyway provided on the center shaft 8. It is necessary to apply an eccentric load to the magnetron 10 so as to fix the attitude of the magnetron 10 in the rotation direction.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a screw rod 21 as a central axis is used in place of the center rod 8, and the upper end of the screw rod 21 It penetrates the center of the cover 6 and is rotatably supported by a bearing 22 provided on the frame 2, and the lower end is fixed to the center of the bottom inside the drum 5.

In this case, the screw rod 21
A small gap 7 </ b> A acting as a choke for preventing radio wave leakage is provided in a penetrating portion between the cover 6 and the cover 6. It is rotatable.

A magnetron 10A is screwed to the screw rod 21 and reciprocates in the axial direction of the screw rod 21 by the rotation of the screw rod 21.

In this case, in order to prevent the magnetron 10A from rotating following the rotation of the screw rod 21, a linear moving guide member of the magnetron 10A is provided, or an eccentric load is applied to the magnetron 10A. There is a need to.

Therefore, also in this embodiment, the drum 5
The magnetron 10A can reciprocate along the center line in the drum 5 according to the rotation of the drum 5, and the microwave can be radiated from the radiating portion 12 at the end of the waveguide 11 to the entire inner peripheral surface of the drum 5. Thus, the same concrete peeling effect as in the above embodiment can be obtained.

[0029]

According to the present invention, the following effects can be obtained. The magnetron is inserted into the central axis while the rotation is restricted, and the waveguide connected to the magnetron is close to the inner peripheral surface of the drum, and the magnetron moves in the axial direction in conjunction with the rotation of the drum. As a result, the microwave can be uniformly radiated from the radiating portion at the open end of the waveguide to the entire inner peripheral surface of the drum, and all the concrete adhered to the inner peripheral surface of the drum can be uniformly peeled off. In addition, the hood can be safely and reliably removed without any human intervention without damaging the dora. Therefore, danger and obstacles to the human body can be avoided, and the removal operation can be performed efficiently.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 Reference Signs List 5 drum 8 central axis (center rod) 10 magnetron 10A magnetron 11 waveguide 12 radiating section 21 central axis (screw rod)

Continuation of the front page (56) References JP-A-3-2595 (JP, A) JP-A-59-38015 (JP, A) JP-A-2-139200 (JP, A) Jpn. , U) Hikaru Hei 2-55106 (JP, U) Hikaru Hei 1-146911 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60P 3/16 B28C 5/42

Claims (1)

(57) [Claims] 1. A center shaft comprising a center rod or a screw rod installed at the center of a drum of a concrete mixer, a magnetron inserted to be axially movable while rotation is restricted by the center shaft, and And a radiating portion having a radiating portion protruding from the opening end and approaching the inner peripheral surface of the drum at an open end. The radiating portion of the waveguide is moved while the magnetron is axially moved in conjunction with the rotation of the drum. Characterized in that microwaves are radiated toward the inner peripheral surface of the drum.