JPH07323247A - Spray gun - Google Patents

Abstract

PURPOSE:To obtain a spray gun in which spraying work is carried out by an automatic mechanism and the positioning of a spray nozzle is carried out by a manual mechanism. CONSTITUTION:A worker gets on a frame and elevates and depresses an arm or rotate it around the vertical line and also expands and contracts it in the axial direction to set it so that the discharge port of a spray nozzle 46 may face a beam. Next, by the manual fine adjustment of the 1st hand lever 5 and the 2nd hand lever 62, the spray nozzle 46 is more accurately set. Since the initial positioning is done by the manual operation with visual observation of the worker, the accurate positioning of the spray nozzle 46 is done in a short time. Next, the rotation range of a hydraulic motor 56 is set according to the spraying limits. While the frame moves along the beam, the spray nozzle 46 is oscillated to accurately and automatically apply a spraying material to within the spraying limits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying device for forming a fireproof coating layer on a steel frame such as a beam or a pillar of a building.

[0002]

2. Description of the Related Art Conventionally, for spraying refractory material, an operator rides on a mobile trolley, grips a spray nozzle, and sprays rock wool or other refractory material onto steel beams such as beams and columns of a building. However, the refractory material could bounce off the workers and the spray nozzles were heavy, which forced heavy labor in a poor working environment.

Therefore, some attempts have been made to mechanize the work of spraying the refractory material. All of these tentative proposals are aimed at full automation.For example, a robot arm that is numerically controlled by remote control is installed on a forklift, and a spray nozzle is attached to the wrist of this robot arm. Target.

However, such a remote control type spraying device has a complicated control mechanism and it takes time to position the spraying direction and the spraying height of the spraying nozzle.
The efficiency of the spraying work was lower than that of human power. Further, in this method, since the control mechanism is complicated, a plurality of spray nozzles cannot be attached.

[0005]

SUMMARY OF THE INVENTION In consideration of the facts described above, an object of the present invention is to provide a spraying device in which a spraying operation can be performed by an automatic mechanism and a spraying nozzle can be positioned by a manual mechanism.

[0006]

A spraying device according to a first aspect of the present invention is a gantry that can move at a constant speed along an object to be blasted and a pedestal that is installed on the gantry and can swing around a vertical line. Together with the arm that expands and contracts in the axial direction, the first hand lever that rotates and fixes the first joint portion connected to the tip of the arm around the first axis line that is orthogonal to the axis line of the arm, and the first joint portion. The second joint part to be connected is the first
The second which is fixed by rotating around a second axis orthogonal to the axis
It is characterized in that it has a hand lever and swing means attached to the second joint portion for gripping the spray nozzle.

According to a second aspect of the present invention, there is provided a spraying device, wherein a distance sensor for detecting a distance between the spraying target and the spraying nozzle, and the arm is driven based on a signal from the distance sensor. And a control means for maintaining the distance between the attachment nozzle and the object to be sprayed within a predetermined range.

[0008]

In the spraying device according to the first aspect, the worker gets on the gantry, raises and lowers the arm, or swivels about the vertical line and expands and contracts in the axial direction so that the spray nozzle discharges the spray nozzle. Set to face each other. Then the first
The fine adjustment is manually performed with the hand lever and the second hand lever so that the spray nozzle faces the spray target more accurately.

As described above, since the initial positioning is manually performed by the operator, the positioning of the spray nozzle can be accurately performed in a short time.

Next, the swing range by the swing means is set corresponding to the spraying range. As a result, the spray nozzle swings and the spray material is automatically and accurately applied to the spray range while the gantry moves along the spray target.
This eliminates the need for the complicated control mechanism required for positioning as in the past, and the spray nozzle swings to spray the refractory material automatically, so variations in the discharge amount are corrected. A quality sprayed film is obtained. The spray thickness may be adjusted by the moving speed of the gantry or the discharge amount of the refractory material.

According to another aspect of the present invention, there is provided a distance sensor for detecting the distance between the blowing nozzle and the object to be blown, and the control means controls the arm based on a signal from the distance sensor. Drive control is performed to maintain the distance between the spray nozzle and the spray target within a predetermined range so that the spray nozzle moves parallel to the spray target. As a result, the refractory material is sprayed accurately.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a spraying apparatus 10 according to this embodiment includes an aerial work vehicle 22 on which columns 20 supporting a pedestal 18 are erected. This aerial work vehicle 2
No. 2 is mounted on a reduction carriage 24 and travels at a constant speed in the extending direction of the beam 12.

On the other hand, the support column 20 is guided by the guide frame 26 and is expanded and contracted by a hydraulic cylinder (not shown) so that the gantry 1
It is designed to raise and lower 8. The outer circumference of the gantry 18 is surrounded by a fall prevention fence 28, which ensures the safety of workers who get on the gantry 18.

A swivel device 40 constituting the arm 16 is attached to an end of the frame 18. This turning device 4
An arm pillar 36 is erected from 0. This arm pillar 3
A bracket 38 is attached to the upper end of 6. A rear end of a cylinder portion 34A of the hydraulic cylinder 34 is pivotally supported on the bracket 38 so as to be vertically rotatable. Also, at the lower end of the arm column 36, the hydraulic cylinder 3
The rear end of the 0 cylinder portion 30A is rotatably supported in the vertical direction. The rod 30 of this hydraulic cylinder 30
The tip of B rotatably supports the cylinder portion 34A. The expansion and contraction of the rod 30B causes the hydraulic cylinder 34 to rise and fall in the vertical direction.

These turning device 40 and hydraulic cylinder 3
The drive mechanism for the hydraulic cylinder 30 and the hydraulic cylinder 30 are housed in the operation box 32 arranged on the pedestal 18, and the arm 16 is swung, expanded, contracted, and undulated by operating the operation lever 28. In addition, a distance sensor (not shown) that detects the distance to the beam 12 is provided on the gantry 18 and is connected to the control device. When the position of the spray nozzle 46 is manually set to the automatic spraying state, the control device swivels, expands or contracts, or undulates the arm 16 based on the signal from the distance sensor, and the spray nozzle 46. The distance between the beam 12 and the beam 12 is controlled to be maintained within a certain range.

On the other hand, the rod 34B of the hydraulic cylinder 34
A bracket 44 is attached to the tip of the. The bracket 44 includes a pair of leg plates 44A. Leg plate 44
A shaft 48 is rotatably attached to A.
A pair of leg plates 50A protruding from the bracket 50 to the rod 34B side are connected to both ends of the shaft 48,
The bracket 50 is adapted to rotate with the shaft 48. A first hand lever 52 is attached to the end portion of the shaft 48, and the shaft 48 can be rotated and locked at a desired position by a clutch mechanism (not shown).

A pair of leg plates 50B is provided on the bracket 50 on the side opposite to the leg plates 50A. The plane portion of the leg plate 50B is in a positional relationship orthogonal to the plane portion of the leg plate 50A. Therefore, the shaft 52 rotatably wound around the leg plate 50B is orthogonal to the shaft 48.

A pair of leg plates 60, which stand upright from both ends of a base plate 58 on which a hydraulic motor 56 is mounted, are connected to the shaft 52, and the hydraulic motor 56 rotates together with the shaft 52. At the end of the shaft 52,
A second hand lever 62 is attached, and the shaft 52 can be rotated and locked at a desired position by a clutch mechanism (not shown).

On the other hand, the rotary shaft of the hydraulic motor 56 penetrates the base plate 58, and the mounting block 64 is connected to the tip thereof. The mounting block 64 can hold the spray pipe 68 by tightening the screw 66. The refractory material 14 is pressure-fed to the spray pipe 68 via a spray hose 70. A spray nozzle 46 is attached to the tip of the spray pipe 68. This spray nozzle 46
Is connected to an air hose 72, and the refractory material 14 is blown onto the beam 12 together with the compressed air.

Next, a spraying work procedure by the spraying device 10 according to this embodiment will be described. First, the reduction carriage 24 is the beam 1
It is arranged at a position where it can move along the extension direction of 2 (direction of arrow B in FIG. 3). Next, the worker boarded the gantry 18,
Up to the position where the spray nozzle 46 faces the beam 12
Extend 0 and stop.

Here, the arm 16 is operated by the operation lever 34 to set the mounting block 64 for holding the spray pipe 68 so as to be positioned at the center of the beam 12 in the vertical direction. Next, the first hand lever 52 and the second hand lever 62 are operated to move the spray tube 68, and fine adjustment is performed so that the spray surface of the beam 12 and the discharge port of the spray nozzle 46 face each other accurately.

As described above, since the initial positioning of the spray nozzle 12 is carried out by a visual operator's manual operation without using a control mechanism, the spray nozzle 46 can be accurately positioned in a short time.

Next, when the spraying device 10 is operated, the reduction carriage 24 moves at a constant speed in the extending direction of the beam 12. At this time, the hydraulic motor 56 repeats normal rotation and reverse rotation at the set rotation angle, the spray pipe 68 swings (direction of arrow A in FIG. 3), and the refractory material 14 pressure-fed through the spray hose 70. Is automatically applied from the spray nozzle 46 to the spray area. The swinging of the spray nozzle 46 corrects the variation in the discharge amount of the refractory material 14 to obtain a high quality spray film.

In the automatic spraying state, the control device swings, expands, contracts, or undulates the arm 16 based on the signal from the distance sensor to maintain the distance between the spray nozzle 46 and the beam 12 within a certain range. Make fine adjustments so that

Further, in the spraying device 10 of the present embodiment, it is possible to install two spraying nozzles 46, but if one spraying nozzle having a large discharge capability is installed, the entire device is designed in a compact manner. it can.

Further, the aerial work vehicle 22 need only have the function of raising and lowering the gantry 18, so that a commercially available product can be used and the manufacturing cost can be reduced.

Next, an experimental example in which a refractory material is actually sprayed by using the spraying device 10 according to this embodiment will be described.

As experimental conditions, the traveling speed of the reduction carriage 24 is 3 m / min, the spray width is 40 cm, and the spray nozzle 4 is
The oscillation period of 6 is 0.5 sec, and the discharge amount of the refractory material is 1
It was set to 5 liters / min. Also, the compounding ratio of the refractory material is
40 by weight, 20 by weight, 14 by water, 14 by weight
0, fluke 20 and gypsum 20.

As a result, as shown in FIG. 4, when 50 cm above and below the spray width was measured, as shown in FIG. 5, the spray thickness was 2 cm over 20 cm from the center of the spray width.
There was a variation of 0 mm to 25 mm, and the finish was extremely smooth compared to the conventional manual spraying.

This is presumed to be due to the effect that the spray nozzle 46 swings at a high speed twice a second.

[0031]

Since the present invention has the above-mentioned structure, the working efficiency of spraying can be improved, the spraying surface can be finished uniformly, and labor saving and muscle work can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state where a spraying operation is performed using the spraying device according to the present embodiment.

FIG. 2 is a perspective view showing a drive mechanism of a spray nozzle of the spray device according to the present embodiment.

FIG. 3 is a side view showing a state in which a refractory material is sprayed on the beam.

FIG. 4 is a cross-sectional view of a beam coated with a refractory material in an experiment.

FIG. 5 is a graph showing experimental results.

[Explanation of symbols]

 16 arm 18 mount 46 spray nozzle 52 first hand lever 56 hydraulic motor (oscillating means) 62 second hand lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masafumi Morita 4-1-1-13 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation Osaka Main Store (72) Inventor Yasuaki Uchida Tsurumi, Tsurumi-ku, Yokohama-shi, Kanagawa Chuo 2-5-5 Ask Co., Ltd.

Claims (2)

[Claims] 1. A gantry that can move at a constant speed along an object to be sprayed, an arm that is installed on the gantry and that can be undulated, pivots around a vertical line, and expands and contracts in the axial direction, and is connected to the tip of the arm. A first hand lever for rotating and fixing the fixed first joint portion around a first axis orthogonal to the axis of the arm, and a second joint portion connected to the first joint orthogonal to the first axis. A spraying device comprising: a second hand lever that is rotated around a second axis and fixed; and a swinging device that is attached to the second joint portion and that grips a spray nozzle. 2. A distance sensor for detecting a distance between the spraying target and the spraying nozzle, and the arm for driving the arm based on a signal from the distance sensor, the spraying nozzle and the spraying target. And a control means for maintaining the distance within a predetermined range.