JP2536952Y2 - Rotary spraying machine - Google Patents

Description

[Detailed description of the invention] << Industrial application field >> This invention is a rotary spraying machine that lines the inside of a cylindrical closed cross section by projecting a hydraulic spraying material such as concrete or mortar in the radial direction through an impeller. About.

<< Conventional Technology >> Generally, the inside of a tubular closed section such as a tunnel, a tunnel, or a cable duct is lined with an irregular refractory, such as concrete or mortar. Is used.

A quick-setting agent is added to the hydraulic spray material so that the sprayed lining layer is quickly cured.

In order to spray the hydraulic spraying material to which the quick-setting agent is added in this way, a construction apparatus using a conventionally used compressed air as a carrier medium causes problems such as generation of dust and rebound dross. Has proposed an impeller type rotary spraying machine which projects a hydraulic spraying material by centrifugal force.

That is, the rotary spraying machine includes a cylindrical casing that transfers the hydraulic spraying material while stirring it with a quick-setting binder via a rotary screw, and the impeller is rotatably attached to an outer periphery of an outlet of the cylindrical casing. It is schematically configured by this.

The impeller is rotated to give a centrifugal force to the hydraulic spray material to be projected in the manner of a centrifugal pump,
The centrifugal force projects the hydraulic spray material in the radial direction.

The rotary screw housed in the cylindrical casing has one end connected to and supported by a rotational force output source attached to the cylindrical casing, and the rotational screw is rotated at a high speed by the rotational force output source. It has become.

<< Problems to be solved by the invention >> However, in such a conventional rotary spray machine,
As described above, one end of the rotary screw is supported on the cylindrical casing side via the torque output source, but the other end of the rotary screw, that is, the end on the impeller side from which the hydraulic spray material is discharged. Had a free end.

For this reason, a bending force acts on the other end of the rotary screw with rotation, and when the bending screw is eccentric, a twist is generated between the rotation screw and the inner periphery of the cylindrical casing,
There was a problem that the rotating screw was locked.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a rotary spraying machine that enables smooth operation by preventing eccentricity of a rotary screw.

<< Means for Solving the Problems >> In order to achieve such an object, the present invention provides a tubular casing provided with an inlet and an outlet for hydraulic spraying material,
A rotary screw that is provided in the cylindrical casing and transfers the hydraulic spray material while stirring from the inlet to the outlet, and is provided at the outlet of the cylindrical casing,
Through a sleeve fitted to the outer periphery of the cylindrical casing, a driving unit different from the driving unit for the rotary screw rotates at high speed concentrically with the rotary screw to project a hydraulic spray material in a radial direction. A rotary spraying machine comprising an impeller, and lining the inside of a cylindrical closed cross section with a hydraulic spraying material projected from the impeller, wherein the rotary screw has one end portion connected to the cylindrical casing via a torque output source. In addition to being supported, the other end is rotatably supported at the center of the impeller.

<< Operation >> With the above configuration, in the rotary spraying machine of the present invention, one end of the rotary screw is supported on the cylindrical casing side via the torque output source, and the other end can be relatively rotated by the impeller. , The rotary screw is supported at both ends.

Therefore, the operation of the impeller that rotates at a high speed by a driving unit different from the driving unit of the rotary screw is not hindered, and the strength of the rotary screw against bending is significantly increased, and eccentricity due to rotation can be prevented. .

<< Example >> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 show a rotary spraying machine 10 showing an embodiment of the present invention. FIG. 1 shows a sectional front view and FIG. 2 shows a side view. (See FIG. 2), and this support base 11 is mounted on a stand (not shown) so as to be able to move up and down, forward and backward, and incline via an actuator such as a hydraulic cylinder. It can be moved on rails.

The rotary spraying machine 10 has a cylindrical casing 12 fixed to the support base 11, and an inlet 14 for a hydraulic spraying material W is formed on one upper end of the cylindrical casing 12, and the other. The end is released as outlet 16.

On the central axis of the cylindrical casing 12, a rotary screw 18 for transferring the hydraulic spray material taken in from the inlet 14 toward the outlet 16 while stirring is provided.

The rotary screw 18 includes a continuous blade 18a and a stirring blade 18b.
Are alternately arranged in the axial direction, and one end thereof is connected to a drive motor 22 via a speed reducer 20 attached to one end of the cylindrical casing 12, and the rotation screw 18 is rotated at a high speed by the drive motor 22. .

The reduction gear 20 and the drive motor 22 constitute a torque output source 23.

The continuous blade 18a mainly serves to transfer hydraulic spray material, and the stirring blade 18b mainly serves to agitate hydraulic spray material.

The inlet 14 is provided with a quick-setting agent adding portion 14a.

A first sleeve 24 is rotatably fitted on the outer periphery of the end of the cylindrical casing 12 on the discharge port 16 side, and the first sleeve 24 is rotatably supported on the support base 11 via a bearing base 26. Is done.

A second sleeve 28 is fitted to the outer periphery of the first sleeve 24 so as to be relatively rotatable, and the second sleeve 28 is rotatably supported by the support base 11 via a bearing base 30.

An impeller 32 for covering the discharge port 16 of the cylindrical casing 12 is provided at the tip (the left end in the figure) of the second sleeve 28.
Is attached.

The impeller 32 has a guide impeller 34 at the inner periphery and a projection impeller 36 at the outer periphery.The latter projection impeller 36 is configured by fixing the radial vanes 42 between a pair of annular disks 38, 40. In addition, the former guide impeller 34 has radial blades 46 attached to a closing plate 44 mounted on the inner peripheral portion of the annular disk 40.
Is fixed.

The guide impeller 34 is connected to the rotary screw 18
As a result, the hydraulic spray material transferred in the direction of the rotation center axis is guided in the outer diameter direction, and the projected impeller 36 projects the guided hydraulic spray material in the radial direction.

On the other hand, the space between the guide impeller 34 and the projection impeller 36 is blocked by the distal end of the first sleeve 24,
The distal end is communicated only through an opening 48 formed in a part in the circumferential direction. Accordingly, the hydraulic spraying material guided in the radial direction by the guide impeller 34 is sent out to the projection impeller 36 only through the opening 48, and is projected from the projection impeller 36 by the position of the opening 48. Direction is determined.

The second sleeve 28 to which the impeller 32 is mounted is rotated at a high speed via a motor 50 attached to a bearing base 30, which is another rotation driving means different from the rotational force output source 23 that rotates the rotary screw 18, Impeller with this second sleeve 28
32 is rotated.

On the other hand, the rotation angle of the first sleeve 24 is adjusted by a motor 52 (see FIG. 2) attached to the support base 11, and
The position of the opening 48 is controlled.

Here, in the present embodiment, the other end of the rotary screw 18, that is, the end on the discharge port 16 side is supported at the center of the impeller 32 so as to be relatively rotatable.

FIG. 3 is an enlarged sectional view showing details of the impeller 32. The radial blades 46 of the guide impeller 34 are fixed to a base plate 60, and the base plate 60 is mounted on the closing plate 44.

An annular boss 60a having a hole for fitting the other end of the rotary screw 18 so as to be rotatable relative to the center of the base plate 60, that is, on the extension of the rotary shaft of the rotary screw 18, is provided. , Protruding toward the inside of the cylindrical casing 18.

On the other hand, a small-diameter piece 62 is coaxially implanted at the other end of the rotary screw 18, and the small-diameter piece 62 is fitted to the boss portion 60a via a bearing metal 64 so as to be relatively rotatable.

With the above configuration, in the rotary spraying machine 10 of the present embodiment, the hydraulic spraying material introduced into the cylindrical casing 12 together with the quick-setting binder from the inlet 14 is stirred by the rotation of the rotary screw 18 while the impeller is rotated. It is transported in the 32 direction, and then reaches the projection impeller 36 from the guide impeller 34 via the opening 48 of the first sleeve 24, and the projection impeller 36 applies centrifugal force to project in the outer diameter direction.

The hydraulic spraying material projected from the projection impeller 36,
It collides with and adheres to the inner surface of the cylindrical closed cross section P such as a tunnel.

By the way, in the present embodiment, the rotating screw 18 housed in the cylindrical casing 12 has one end supported by the cylindrical casing 12 via the speed reducer 20, and the other end located at the center of the guide impeller 34. Supported to be relatively rotatable.

Here, the guide impeller 34 is integral with the projection impeller 36, and since the projection impeller 36 is fitted on the outer periphery of the cylindrical casing 12 via the first sleeve 28, as a result, the rotation screw 18 The other end is supported by the cylindrical casing 12 side.

Therefore, since the rotating screw 18 is supported at both ends with respect to the cylindrical casing 12, bending deformation when the rotating screw 18 is rotated at high speed is eliminated, and the eccentricity of the other end which has conventionally occurred can be prevented. Can be.

<< Effects of the Invention >> As described above, in the rotary spraying machine of the present invention, one end of the rotating screw that transfers the hydraulic spraying material while stirring it is housed via a rotating force output source. And a drive different from the rotational power output source via a sleeve fitted on the outer periphery of the cylindrical casing, the other end of which is provided at an outlet of the cylindrical casing. Since the rotating screw is rotatably supported on the impeller rotating at high speed concentrically with the rotating screw, the rotating screw can be supported at both ends with respect to the cylindrical casing.

Therefore, the strength of the rotary screw against bending is significantly increased without hindering the high-speed rotation of the impeller, and eccentricity due to the rotation of the rotary screw can be easily prevented.

For this reason, the rotation screw is prevented from being twisted with the inside of the cylindrical casing, and an excellent effect that a smooth operation of the rotary spraying machine can be achieved is achieved.

[Brief description of the drawings]

1 is a sectional front view showing one embodiment of the present invention, FIG. 2 is a side view showing one embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part showing one embodiment of the present invention. . 10 Rotary spraying machine 12 Cylindrical casing 14 Inlet 16 Outlet 18 Rotating screw 23 Rotational power source 32 Impeller 34 Guide impeller 36 Projection impeller

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichi Fujii 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-58-30000 (JP, A) 58-161000 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical casing provided with an inlet and an outlet for hydraulic spraying material, and provided in the cylindrical casing, while stirring the hydraulic spraying material from the inlet toward the outlet. The rotating screw to be transferred, provided at the outlet of the cylindrical casing, via a sleeve fitted to the outer periphery of the cylindrical casing, by a driving means different from the driving means of the rotating screw, the rotating screw, An impeller that concentrically rotates at a high speed and projects a hydraulic spray material in a radial direction, and wherein the hydraulic spray material projected from the impeller lines a cylindrical closed cross section with a rotary spray machine, wherein the rotary screw is , One end of which is supported by the cylindrical casing via a rotation output source, and the other end of which is rotatably supported by the center of the impeller. Rotary sprayer according to claim.