JP2001336879A - Radiation heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation heater in which a region being heated most by an infrared radiator can be aligned easily with the central part of a plane being heated. SOLUTION: In the radiation heater comprising an infrared radiator 6 having adjustable height and angle, a laser pointer 10 is provided in the infrared radiator 6 and the optical axis C of the laser pointer 10 points a region being heated most by the infrared radiator 6. More specifically, the laser pointer 10 is shifted upward by a distance D from the center O of the radiation plane 8 of the infrared radiator 6 such that the optical axis C of the laser pointer 10 is in parallel with a direction normal to the radiation plane 8 of the infrared radiator 6. Alternatively, the laser pointer is located in the center of the radiation plane of the infrared radiator and the optical axis of the laser pointer makes a specified angle upward to a direction normal to the radiation plane of the infrared radiator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant heater used, for example, for drying a repair coating of an automobile.

[0002]

[Prior art] In the drying process of repair painting of automobiles, drying and hardening of putty, water sharpening drying, drying of primer surfacer, drying of intermediate coating or top coating, etc., from infrared heater or far infrared heater. A radiant heater equipped with an infrared radiator is used. Since the size, position, and inclination of the repair painting surface of an automobile are not constant, it is necessary to adjust the height and angle of the infrared radiator according to the position and inclination of the repair painting surface. A mechanism for adjusting and locking the height and angle of the infrared radiator independently of each other is usually employed.

[0003] These radiant heaters are used as described below.・ Fix the radiant heater at an appropriate distance (usually 0.5m-1.5m) from the repair painting surface of the automobile.・ Adjust the angle of the infrared radiator according to the inclination of the repair painting surface.・ Adjust the height of the infrared radiator so that the center axis of the radiation surface of the infrared radiator is positioned on the repaired painted surface.・ If the distance between the repaired painted surface and the infrared radiator is inappropriate, repeat the adjustment.・ Turn on the heater switch, start heating, and after a predetermined time, turn off the switch with the timer.

[0004]

However, if one of the height and the angle of the infrared radiator is changed, the center axis of the radiation surface of the infrared radiator moves, so that the other must be changed. Therefore, in order to accurately adjust the height and angle of the infrared radiator, it was necessary to repeat the adjustment operation many times.

[0005] In addition, conventional radiant heaters have the following disadvantages. There is no scale or standard for adjusting the height and angle of the infrared radiator. -The radiant intensity of the upper part of the infrared radiator tends to be high due to the convection along the radiation surface of the infrared radiator, and the upper part of the repaired painted surface is further heated by the influence of the convection along its own surface. That is, the position of the repaired painted surface opposite to the center of the radiation surface of the infrared radiator is shifted from the highest heating position. For these reasons, it has not been easy to adjust the height and angle of the infrared radiator so that the area most heated by the infrared radiator is the center of the repaired painted surface.

On the other hand, Japanese Patent Application Laid-Open No. 7-171490 discloses a coating method for controlling the amount of heat of an infrared heater to prevent overheating of a resin work while measuring the surface temperature of the resin work to which the paint is applied by a radiation thermometer. A drying method is described. Further, Japanese Patent Application Laid-Open No. 8-024760 discloses a repair control for controlling a heater temperature by comparing a set signal corresponding to the evaporation temperature of a solvent used and a detection signal obtained by detecting a temperature of a repair coating surface of a work with a radiation thermometer. An apparatus for drying a painted surface is described. These paint dryers can control the heater power by detecting the temperature of the painted surface in a non-contact manner, but there is no guarantee that the temperature can be measured at a necessary place.

[0007] If the height and angle of the infrared radiator are inappropriate, the required heating cannot be applied to the repaired painted surface, so that the work efficiency is reduced and the power consumption is disadvantageously increased. Further, when the height and angle of the infrared radiator are extremely inappropriate, there may be a case where poor drying of the coating occurs or a portion having low heat resistance is unintentionally overheated and deformed.

It is an object of the present invention to provide a radiant heater capable of easily adjusting a region most heated by an infrared radiator to a center portion of a surface to be heated.

[0009]

In order to solve the above problems, the present invention employs the following means. That is, in a radiant heater equipped with an infrared radiator whose height and angle can be adjusted, a laser pointer is disposed on the infrared radiator, and an optical axis of the laser pointer is heated by the infrared radiator in an area where the optical axis is best heated. It is characterized by pointing.

As described above, the heated surface can be appropriately heated by adjusting the designated spot of the laser pointer to the center of the heated surface. At this time, since the designated spot of the laser pointer is sufficiently bright, the position of the designated spot can be easily confirmed irrespective of the color of the painted surface or the surrounding brightness, and the height and angle of the infrared radiator can be easily adjusted.

[0011] In a radiant heater in which the radiation surface of the infrared radiator is made vertical, when the surface to be heated which is perpendicular thereto is heated, the most heated portion of the surface to be heated is the center of the radiation surface of the infrared radiator. This is a region slightly shifted upward from the position corresponding to.

Therefore, in the above, the arrangement position of the laser pointer is separated by a predetermined distance upward from the center of the radiation surface of the infrared radiator, and the optical axis of the laser pointer is parallel to the direction perpendicular to the radiation surface of the infrared radiator. It is good to be. Alternatively, the laser pointer is located at the center of the radiation surface of the infrared radiator, and the optical axis of the laser pointer is at a predetermined angle upward with respect to the direction perpendicular to the radiation surface of the infrared radiator. Good.

A radiation thermometer having an optical axis parallel to the optical axis of the laser pointer is arranged on the infrared radiator, and a temperature signal from the radiation thermometer is compared with a set temperature signal to determine the radiation of the infrared radiator. It is preferable to provide a control device for controlling the intensity. Preferably, the control device includes a timer that operates when the temperature signal from the radiation thermometer exceeds a set temperature, and turns off the infrared radiator after a predetermined time has elapsed. Further, it is preferable to provide an alarm which operates when a temperature signal from the radiation thermometer exceeds a set temperature.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
And FIG.

As shown in FIG. 1, the radiant heater of the present invention has a truck 1, and the truck 1 is configured to be movable by four casters 2 fixed to the lower surface. I have. A support 3 is vertically fixed to the upper surface of the carriage 1, and a support cylinder 4 is attached to the support 3 so as to be able to move up and down and to be fixed at an appropriate height position. A power supply box 5 containing a switch, a timer, and the like is fixed to the back surface of the support cylinder 4. A pair of stays 7 extend forward from the front surface of the support tube 4, and the infrared radiators 6 are attached to the stays 7 so that the infrared radiators 6 can rotate in the front-rear direction and can be fixed at appropriate angular positions. The infrared radiator 6 has four far infrared heaters. The four radiating surfaces 8a of these far-infrared heaters are equally spaced two by two vertically and horizontally on the front surface of the infrared radiator 6. Each radiation surface 8a has a substantially square shape, and a reflection plate 9 is fixed around each radiation surface 8a. Thus, the radiation surface 8 of the infrared radiator 6
Is composed of four radiating surfaces 8a which are arranged vertically and horizontally evenly.

The infrared radiator 6 has a laser pointer 10
Is attached. The laser pointer 10 is arranged at a position away from the center O of the radiation surface 8 of the infrared radiator 6 by a predetermined distance D in the upward direction. CL is a center line passing through the center O. The optical axis C of the laser pointer 10 is parallel to a direction perpendicular to the radiation surface 8 of the infrared radiator 6. Here, if the distance D is selected in the range of 30 to 70 mm, the area that is most heated by the infrared radiator 6 and the designated spot of the laser pointer 10 match well.

In the following, when heating with the above-mentioned radiant heater, the highest temperature position equilibrating with the outside air is determined by the radiation surface 8 of the infrared radiator 6.
Is shifted from the position corresponding to the center O of FIG.

With the radiant heater (heater power: 3.2 kW) in which the radiation surface 8 of the infrared radiator 6 is made vertical, a vertically placed coated steel plate (thickness: 0.7 mm) is reduced by 0.8 m. FIG. 2 shows the result of measuring the equilibrium temperature of the coated steel sheet when heated from the distance of FIG. The figure shows that the maximum temperature position M of the coated steel sheet is shifted upward by about 40 mm from a position corresponding to the center O of the radiation surface 8 of the infrared radiator 6. The DF indicates a deviation.

Next, the operation of the radiant heater will be described.

The height and angle of the infrared radiator 6 are adjusted so that the designated spot of the laser pointer 10 coincides with the center of the repair painting surface. Since the designated spot of the laser pointer 10 is sufficiently bright, it is easy to confirm the position of the designated spot regardless of the paint color and the surrounding brightness.
Height and angle can be easily adjusted. By the above adjustment, the area most heated by the infrared radiator 6 coincides with the center of the repair painting surface, and the heating and drying are appropriately performed. As a result, the drying time is reduced and the power consumption is reduced.

FIG. 3 shows another embodiment of the present invention. The present embodiment is different from the above-described embodiment in the manner of setting a laser pointer 10 arranged on the infrared radiator 6. In the present embodiment, the position of the laser pointer 10 is located at the center O of the radiation surface 8 of the infrared radiator 6, and the optical axis C of the laser pointer 10 is aligned with the radiation surface 8 of the infrared radiator 6.
The angle θ is in the upward direction with respect to the direction perpendicular to. Here, if the angle θ is selected in the range of 3 to 10 degrees, the error between the region most heated by the infrared radiator 6 and the spot position indicated by the laser pointer 10 is reduced.

In the above embodiment, an infrared radiator is attached to a support fixed to a carriage (actually, 2-0).
No. 02458), an example of a radiant heater to which the present invention is applied is shown. However, another type of radiant heater, for example, a suspended infrared radiator moves along a rail fixed to a beam of a ceiling. The present invention can be similarly applied to such a device. Further, in the above embodiment, the infrared radiator is constituted by a plurality of far-infrared heaters and a reflection plate, but the radiant heater having the infrared radiator constituted by a single far-infrared heater The present invention can of course be applied to this.

In the above embodiment, the infrared radiator is constituted by the far infrared heater, but may be constituted by the infrared heater.

[0024]

As described above, according to the present invention, since the designated spot of the laser pointer is sufficiently bright, it is easy to confirm the position of the designated spot regardless of the color of the painted surface or the surrounding brightness. The height and angle of the infrared radiator can be easily adjusted by using the spot as a guide, and the adjustment can make the spot to be indicated by the laser pointer coincide with the center of the surface to be heated, so that the surface to be heated can be appropriately heated. As a result, the drying time and the like can be reduced, and the power consumption can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B show an embodiment of the present invention, wherein FIG. 1A is a front view of a radiant heater, FIG. 1B is a side view, and FIG. 1C is a view showing an installation position and an optical axis of a laser pointer.

FIG. 2 is a view showing an equilibrium temperature distribution of a coated steel sheet when the coated steel sheet placed vertically by a radiant heater is heated.

FIG. 3 is a view showing another embodiment of the present invention, showing the installation position and the optical axis of a laser pointer.

[Explanation of symbols]

Reference Signs List 1 cart 2 caster 3 support 4 support tube 5 power supply box 6 infrared radiator 7 stay 8a, 8 radiation surface 9 reflector 10 laser pointer O center of radiation surface of infrared radiator C optical axis CL center line D passing through center O D laser Distance between the pointer and the center O of the radiation surface of the infrared radiator M Maximum temperature position DF Deviation between the position relative to the center O of the radiation surface of the infrared radiator and the maximum temperature position

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F26B 9/00 F26B 9/00 C 25/00 25/00 A F term (reference) 3L113 AA01 AB06 AC10 BA33 CA04 CB06 DA02 DA10 4D075 BB37Z DA27 DB02 DC12 4F042 AA09 BA19 DB06 DB18

Claims (6)

[Claims] 1. A radiant heater having an infrared radiator whose height and angle can be adjusted, wherein a laser pointer is disposed on the infrared radiator, and an optical axis of the laser pointer is best heated by the infrared radiator. Radiant heater characterized by directing a region to be heated. 2. The laser pointer is located above a center of a radiation surface of the infrared radiator, and an optical axis of the laser pointer is parallel to a direction perpendicular to a radiation surface of the infrared radiator. The radiant heater according to claim 1, characterized in that: 3. The laser pointer is located at a center position of a radiation surface of the infrared radiator, and an optical axis of the laser pointer forms a predetermined angle upward with respect to a direction perpendicular to a radiation surface of the infrared radiator. The radiant heater according to claim 1, wherein 4. A radiation thermometer having an optical axis parallel to an optical axis of the laser pointer is arranged on the infrared radiator, and compares a temperature signal from the radiation thermometer with a set temperature signal to determine the infrared temperature. 4. The radiant heater according to claim 1, further comprising a control device for controlling the radiation intensity of the radiator. 5. The radiant heater according to claim 4, wherein the control device includes a timer that operates when a temperature signal from the radiant thermometer exceeds a set temperature. 6. The radiant heater according to claim 4, further comprising an alarm which is activated when a temperature signal from the radiant thermometer exceeds a set temperature.