JPH0337735Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a cylindrical structure coating device.
This invention relates to an apparatus for coating the inner surface of a cylindrical structure using a centrifugal projection method.

(Prior Art) When forming a refractory coating layer on the inner surface of a vertical cylindrical structure such as a chimney, conventionally, a scaffold is generally built inside the cylindrical structure, and a refractory material is applied from the outside onto this scaffold. The method used was to use pneumatic air to spray the inside of the cylindrical structure using a nozzle man, and then gradually add scaffolding as the construction progressed.

(Problems to be solved by the present invention) However, the above-mentioned coating method requires the nozzleman to spray by hand by placing himself inside the cylindrical structure, so it is affected by the negative effects of residual heat and dust. This posed a safety problem, as there was a risk of people falling off the scaffolding or accidentally falling off the scaffolding.

In addition, since it is hand-blown, it requires a great deal of labor.
In particular, these types of cylindrical structures are often huge, over 100m in height and over 5m in diameter, so many people are required to construct them. Moreover, since there are individual differences in the skill level of the spraying operation, there was a problem that it was not possible to line the inner surface of the cylindrical structure with a uniform thickness and a good finish.

As a countermeasure against this problem, a device has been proposed in which a spray nozzle mechanism is suspended from the top of a cylindrical structure using a crane or the like, and the refractory is pneumatically delivered to this spray nozzle mechanism from the outside to perform spraying. .

This device has the advantage of being able to perform automatic spraying, but since the lining work involves spraying a single pipe with a bent nozzle toward the inner surface of the cylindrical structure, it is difficult to spray within a narrow range of the nozzle angle. However, there is a problem that the efficiency is low.

Additionally, because a large amount of refractory is sprayed in a concentrated manner in a narrow area, and a cluster of coating layers with the desired thickness is formed in the circumferential direction, a step is created at the joint between each coating layer. However, the resulting coating layer had a poor finish, such as unevenness, and required a separate and complicated finish blowing process.

In addition, since the refractory is simply attached to the cylindrical structure using compressed air pressure, a large amount of refractory is sprayed onto a small area, and due to its own weight, the adhesion strength is weak and peeling is likely to occur. There was a problem.

(Means for solving the problems) The present invention was devised through research in order to eliminate the problems of the conventional methods as described above. It is an object of the present invention to provide an apparatus capable of automatically forming a coating layer having a thick, smooth finished surface and strong adhesion.

In order to achieve the above object, the present invention suspends and lowers a centrifugal projector in a cylindrical structure, guides the refractory into the centrifugal projector from below with a conveyance hose, stops the conveyor hose and drive mechanism, and Only the centrifugal projector is rotated to form a coating layer continuously around the entire circumference.

That is, in the present invention, a motor is fixed to a casing that is suspended in a cylindrical structure by a suspension mechanism, and a centrifugal projector in which the upper and lower plates are connected by radial blades is disposed below the casing. Directly connecting a protruding shaft provided on the plate to the output shaft of the motor,
The lower plate is provided with a cylindrical shaft with a built-in bearing, and the bearing is equipped with a stationary cylinder having a conical protrusion installed in the center of the upper plate and a lattice-like id that forms a diagonal passage. It is characterized in that the tip of the covering material conveyance hose is connected.

(Embodiments) Examples of the present invention will be described below with reference to the accompanying drawings.

Figure 1 shows an outline of the centrifugal projection type cylindrical structure inner surface coating device according to the present invention, in which 1 shows which cylindrical structure the chimney is attached to, 2 shows the coating device according to the present invention, and 3 shows which cylindrical structure the chimney is attached to. A lifting mechanism such as a winch is provided at the top, 4 is a means for pneumatically transporting powdery refractories using compressed air, and 5 is a means for pumping a liquid such as water, which is installed outside the cylindrical structure 1. be done. Reference numerals 6 and 7 indicate conveyance hoses which are guided inside through manhole holes at the bottom of the cylindrical structure and connected to the device 2 of the present invention.

2 and 3 show details of the device 2 of the present invention. 8 is a drum-shaped casing connected to the cable 33 from the suspension mechanism 3, and includes a bottom plate 81 and a lid plate 82.
The top and bottom are closed.

A motor 9 is fixed to a support 83 fixed to the bottom plate 81, and has an output shaft 91 extending downward.

Reference numeral 10 denotes a centrifugal projector disposed directly below the casing 8, with disc-shaped upper plates 1 facing each other at a predetermined interval.
1 and the lower plate 12, and the upper plate 11 and the lower plate 12
and a radial vane 13 that integrally connects the two.

The upper plate 11 is provided with a protruding shaft 14 at the upper part and a conical projection 18 at the center of the lower part, and the protruding shaft 14 extends into the abutment 83 via a bearing 15 provided on the casing bottom plate 81. , is directly connected to the output shaft 91 of the motor 9 by a coupling 16, and is supported by the casing 8 by being screwed into a nut member 17 provided on the upper part of the bearing.

A cylinder shaft 20 having a radial bearing 19 arranged on the inner circumference is fixed to the lower plate 12, and a stationary cylinder 21 in contact with the radial bearing is inserted into this cylinder shaft 20.
At the upper part of the conical projection 18, a diagonal passage 22 is formed.
A lattice-shaped guide 23 is provided, and the lattice-shaped guide 23 is configured in a non-contact relationship with the lower plate 12, and each radial blade 13 has a cutout 24 at a position corresponding to the lattice-shaped guide 23. It is set up.

In the embodiment, the stationary cylinder 21 is composed of an inner cylinder 25 and an outer cylinder 26, and the outer cylinder 2 is provided on the lower outer periphery of the inner cylinder 25.
A flange 27 is formed in contact with the lower end of 6.

On the other hand, a connecting fitting 28 having a flange 29 is provided at the tip of the transfer hose 6, and the flange 29 is attached to the inner tube 25.
Fit the holding fitting 30 in contact with the
By screwing the internal thread provided on this with the external thread of the outer cylinder 26, the centrifugal projector and the transport hose are connected so that only the former rotates.

A ring nozzle 31 having a plurality of nozzles communicating with the refractory pneumatic passage is attached to the transport hose 6 near the holding fitting 30 or to the outer periphery of the stationary cylinder below the cylinder shaft 20. A conveying hose 6 from the means 5 is connected.

A plurality of legs 32 are attached to the outer periphery of the stationary cylinder 21 to position the centrifugal projector 10 at the center of the cylindrical structure 1 and to prevent twisting.

The means 4 for pneumatically conveying the refractory material can have any structure as long as it uses compressed air as a conveying medium. A rotor type is used, which includes an air blowing nozzle facing a part of the air blowing nozzle and a discharge nozzle provided at a corresponding position.

(Function) Since the present invention has the above-mentioned configuration, when forming the coating layer on the inner surface of the cylindrical structure,
The transport hose 6 is connected to the stationary cylinder 21, the transport hose 7 for liquid is connected to the ring nozzle 31, and the cable 33 of the suspension mechanism 3 is connected to the casing 8. Next, the refractory pneumatic feeding means 4, the liquid pressure feeding means 5, and the motor 9 are driven, and the lifting mechanism 3 is driven to raise the casing 8.

In this way, the driving torque of the motor 9 is transferred to the output shaft 9.
1 to the protruding shaft 14 of the centrifugal projector 2 through the coupling 16, and the centrifugal projector rotates. At this time, the lower plate 12 and cylinder shaft 20 of the centrifugal projector 10 also rotate, but since the cylinder shaft 20 has a radial bearing 19 installed therein, the stationary cylinder 21 and the flange-shaped guide 23 rotate.
And the conveyance hose 6 is kept in a non-rotating state.

On the other hand, the refractory is continuously discharged from the refractory pneumatic means 4 to the conveying hose 6 by compressed air, guided into the cylindrical structure from the lower part of the cylindrical structure 1, and sent to the centrifugal projector 10. Similarly, the solution is introduced into the cylindrical structure from the solution pressure feeding means 5 via the transfer hose 7, and is injected into the refractory stream from the nozzle of the ring nozzle 31 just before the centrifugal projector 8, where it mixes with the refractory. . This results in a wet coating material.

The wet coating material rises in the stationary cylinder 21, is distributed between the conical protrusion 18 and the flange-shaped guide 23 in the diagonal passage 22, and is at the same time changed direction. It is sucked in between the radial blades 13, blown away in the tangential direction by centrifugal force, and collides with and adheres to the inner surface of the cylindrical structure.

The present invention does not simply utilize the pressure of compressed air, but superimposes the centrifugal force caused by the high speed rotation of the radial blades, resulting in extremely good adhesion to the inner surface of the cylindrical structure. Moreover, unlike a single-tube nozzle, the material is not sprayed in one direction, but the material is simultaneously projected over the entire circumference by each radial vane 13. Therefore, the inner surface of the cylindrical structure has a form in which the thickness gradually increases from a thin coating layer that is uniform around the entire circumference in a range that corresponds to the projection spread angle of the centrifugal projector. The result is a thick, smooth surface, and a strong coating layer that does not peel off.

Note that the thickness of the coating layer can be freely and easily adjusted by keeping the discharge amount of the refractory pneumatic feeding means 4 and the rotation speed of the centrifugal projector 10 constant and controlling the rope pulling speed by the suspension mechanism 3. can.

In addition, since the conveyance hose is introduced from below the cylindrical structure 1 and is well connected to the centrifugal projector 10 in a non-rotating state, the hose length can be kept to a minimum, and the projection of the centrifugal projector 10 can be Since the direction is not obstructed, there are no blind spots.

Furthermore, the tuppa-shaped guide 23 and the conical projection 18
Since the diagonal passage 22 is formed by the high-pressure material, no impact is caused by the material, and the material can be distributed and supplied to each radial blade 13, so that the material enters along the rattle-shaped guide 23 and is released into the atmosphere by centrifugal force. Since the material is blown away, there is no need for the material to get caught in the radial bearing, and as a result, stable centrifugal projection can be performed without using an expensive swivel joint.

(Effects) The present invention described above not only automatically coats the inner surface of cylindrical structures such as chimneys, but also provides a highly efficient coating layer with high strength, uniform thickness, and good raised surface. It has excellent effects such as being simple in structure and relatively inexpensive to implement.

[Brief explanation of the drawing]

Fig. 1 is a side view showing how the centrifugal projection type cylindrical structure inner surface coating device according to the present invention is used, Fig. 2 is a cross-sectional view showing the main parts of the device of the present invention, and Fig. 3 is a centrifugal projection method according to the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Cylindrical structure, 3... Hanging mechanism, 6... Transport hose, 8... Casing, 9... Motor, 10... Centrifugal projector, 11... Upper plate, 12... Lower plate, 13... Radial direction blade, 14... Projected shaft, 18... Conical projection, 20... Shaft tube, 21... Stationary tube, 23... Lapple-shaped guide.

Claims (1)

[Scope of utility model registration request] The motor is fixed to a casing that is suspended in a cylindrical structure by a suspension mechanism, and a centrifugal projector is placed below the casing with upper and lower plates connected by radial blades, and a protrusion provided on the upper plate is installed. The shaft is directly connected to the output shaft of the motor, while the lower plate is provided with a cylindrical shaft with a built-in bearing, and the bearing has a lattice shape that forms an oblique passage with a conical protrusion installed in the center of the upper plate. 1. A centrifugal projection type cylindrical structure inner surface coating device, characterized in that a stationary tube having a guide is installed therein, and a distal end of a material conveying hose for coating is connected to the stationary tube.