JPH0629519U - Welding protection surface - Google Patents

Abstract

(57) [Abstract] [Purpose] During welding, the welding window automatically becomes a dark field with high light-shielding properties to protect the eyes from flashing light, and at other times, it exhibits translucency and exhibits welding spots, welding rods, etc. A protective surface for welding that can be easily checked. A liquid crystal panel 5 having a protective glass 3, an ultraviolet protection glass 4, and a TN array cell for blocking light when a voltage is applied is provided in a light-shielding window 2 of a protective surface main body 1 which is used by covering the head with a support belt portion 10. A photodetector 7 such as a Cd cell is provided above the light-shielding window 2 of the protective surface main body 1, and the photodetector 7 and the liquid crystal panel 5 are connected to a power supply box 6.
Only when the photodetector 7 detects a welding flash and a photodetection signal is sent, a voltage is supplied to the liquid crystal panel 5 to make the light-shielding window 2 a dark field only from the start of welding to the end of welding. In this case, the welding light is shielded, and in other cases, the light shielding window 2 is made transparent so that the visibility of the welding spot and the welding rod is exhibited.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding protection surface which is mainly used to protect the eyes from harmful flash during welding.

[0002]

[Prior art]

 It is mandatory to use a protective surface for welding, in order to protect the eyes from the flash and the face from the splash of molten metal, especially when harmful flash is generated during welding such as arc welding. ing. There are various forms of the protective surface for welding, such as one in which a gripping hand attached to the protective surface is used, and one in which a head portion is covered with a support belt portion. The protective surface itself is made of a lightweight material that has high light-shielding and heat-insulating properties, and has a shape that covers the face.

Further, a light-shielding window incorporating a light-shielding glass that slightly transmits flash light at the time of welding is provided on the protective surface for welding. Through this light-shielding window, it is possible to confirm the flashing light at the time of welding and to perform the welding work while confirming the welding position by the irradiation of the flashing light. Some of these light-shielding windows incorporate, in particular, an anti-UV glass or a protective glass for protecting the anti-UV glass in order to remove the harmful UV components of the flash.

[0004]

[Problems to be solved by the device]

 However, on the conventional welding protection surface, it is difficult to confirm the welding spots, welding rods, etc. through the light-shielding window in the state where no flash is generated due to welding. Welding may occur at the part, resulting in deterioration of work accuracy and quality.

Therefore, when starting welding, welding is often started after confirming the welding starting point and welding position at a position where the light shielding window is not passed. However, in such a method of use, the protective surface for welding must be displaced from the face each time welding is started, and the face must be covered with the protective surface at the start of welding, which is troublesome and inferior in workability. In addition, with such use, there is a risk that the flash generated by mistake or at the start of welding may be directly observed with the eyes, and in such a case, the eyes may be damaged and the aftereffects such as shadows may occur. Sometimes.

The present invention was developed in view of these problems, and the welding window automatically becomes a dark field with a high light-shielding property to protect the eyes from flash during welding, and at other times, Is to provide a protective surface for welding that exhibits transparency and allows easy confirmation of the welding spot, welding rod, etc.

[0007]

[Means for Solving the Problems]

 The welding protection surface according to claim 1 of the present invention protects the eyes from harmful flashes during welding and protects the face from the splash of molten metal. The invention is characterized in that a liquid crystal panel which becomes a dark field during welding is incorporated in a light-shielding window portion provided with a glass or a protective glass for protecting the ultraviolet protection glass.

A welding protection surface according to a second aspect of the present invention is characterized in that a photodetector for detecting harmful flash light at the time of welding is provided.

[0009]

[Action]

 In the welding protection surface of the present invention, a liquid crystal panel, which becomes a night vision field during welding, is installed in a light-shielding window portion provided with a UV protection glass having a UV protection effect and a protection glass for protecting the UV protection glass. Since a photodetector that detects harmful flash light during welding is provided, when there is no flash light except during welding, the liquid crystal panel is made translucent to make it easy to confirm the welding spot and welding rod. When the photodetector detects harmful flash light during welding, it applies a temperature change or electric field change to the liquid crystal panel based on the detection signal to create a dark field. The light may be shielded to the extent that it is transparent. Therefore, it is possible to reliably protect the eyes from the flash of light at the time of welding, and to eliminate the trouble of shifting or covering the protective surface each time welding is performed, which improves workability.

[0010]

【Example】

 FIG. 1 shows an embodiment of the welding protection surface of the present invention. In the figure, the protective surface body 1 is the same as the existing one, and in this embodiment, the head is covered with the support belt portion 10 protruding from the back surface of the protective surface body 1, What is used from the top of the protective helmet 11 is used. Of course, the protective surface body 1 is sized and shaped to sufficiently cover the face.

As shown in FIG. 2, a light shielding window 2 penetrating from the front surface to the back surface is formed in a substantially central portion of the protective surface main body 1. As shown in FIG. 3, a protective glass 3, an ultraviolet protection glass 4, and a liquid crystal panel 5 are incorporated into the light shielding window 2 from the front side of the protective surface main body 1. By the way, the UV protection glass 4 effectively cuts UV components harmful to the eyes in the flash of light during welding, and the protection glass 3 protects the UV protection glass 4.

For the liquid crystal panel 5, for example, a TN array cell that blocks light by applying a voltage is used. In this TN array cell, a cell is interposed between two orthogonal polarizers, and when no voltage is applied, the polarized light incident from one polarizer is twisted 90 ° through the cell and the other polarizer is twisted. However, when voltage is applied, the polarized light entering from one polarizer passes through the cell as it is without being twisted, so that it does not exit from the other polarizer and does not block light. Exert. Further, molecules that are colored in a desired color when shielded from light may be arranged in the cells.

The liquid crystal panel 5 is connected to a power source box 6 formed separately from the protective surface main body 1 through a connection cable 12 as shown in FIG. 1, and is provided in the power source box 6. By adjusting the amount of voltage applied by a balancer switch not provided, the liquid crystal concentration, that is, the light-shielding rate or light-transmitting rate of the welding flash can be adjusted. Originally, since the liquid crystal panel requires a small amount of electric power to operate, a power source having a relatively small capacity such as a dry battery is installed in the power source box 6, which reduces the weight of the power source box 6 as a whole and moves it. It is possible to improve operability, operability and workability. The power supply box 6 is provided with a power supply switch (not shown).

On the other hand, in the protective surface main body 1, a photodetector 7 such as a Cd cell is provided above the light shielding window 2 in this embodiment, and the photodetector 7 is connected via the connection cable 12. Connected to the power supply box 6. The photodetector 7 detects a flash of light at the time of welding and sends out an electric signal. In the present embodiment, the sending of the photodetection signal starts the voltage application to the liquid crystal panel 5, The voltage application is terminated when the light detection signal is stopped.

When using the welding protection surface of the present embodiment, first, the supply switch (not shown) of the power supply box 6 is turned on, and the voltage is applied to the liquid crystal panel 5 regardless of the detection signal of the photodetector 7. Is applied to adjust the liquid crystal concentration, that is, the light-shielding rate or the light-transmitting rate of the welding flash by the balance switch. Next, the supply switch is set to self-ON so that the voltage is supplied to the liquid crystal panel 5 only when the photodetector 7 detects a welding flash and a photodetection signal is sent from the photodetector 7. By doing this, the light-shielding window 2 is made a dark field to shield the welding flashlight only from the start of welding to the end of welding. In other cases, the light-shielding window 2 is made transparent to improve the visibility of the welding spot and welding rod. Demonstrate.

When the welding protection surface is not used, the supply of power is cut off by setting the supply switch (not shown) to OFF. In the present embodiment, the liquid crystal panel is a TN array cell that blocks light when a voltage is applied, but it is also possible to use a cell that transmits light when a voltage is applied and blocks light when no voltage is applied. The point is that the shield window may be configured to have a dark field by the light detection signal from the light detector.

Further, in the present embodiment, the power supply box is provided separately from the protective surface body, but this power supply source may be provided integrally with the protective surface body. In addition, it is also effective to provide an infrared ray prevention glass along with the light shielding window to protect the liquid crystal panel.

[0018]

[Effect of device]

 As described above, according to the welding protection surface of the present invention, when there is no flash except during welding, the liquid crystal panel is made transparent so that the welding spot and the welding rod can be easily confirmed. When the detector detects harmful flash light during welding, it gives a dark field by changing the temperature or electric field on the liquid crystal panel based on the detection signal to make a dark field. Since the light can be shielded to such an extent that it protects the eyes from the flash of light during welding, there is no need to shift or cover the protective surface each time welding is performed, unlike the conventional method. The property is also improved.

[Brief description of drawings]

FIG. 1 is a use explanatory view showing an embodiment of a welding protection surface of the present invention.

2 is a front view of the welding protection surface of FIG. 1. FIG.

3 is a vertical cross-sectional view of the welding protection surface of FIG.

[Explanation of symbols]

 1 is a protective surface body 2 is a light-shielding window 3 is a protective glass 4 is a UV protection glass 5 is a liquid crystal panel 6 is a power supply box 7 is a light detector

Claims (2)

[Scope of utility model registration request] 1. A UV protection glass having a UV protection effect and a protection glass for protecting the UV protection glass in a protection surface for welding, which protects the eyes from harmful flash during welding and protects the face from scattering of molten metal. A protective surface for welding, characterized in that a liquid crystal panel that becomes a dark field during welding is incorporated in the light-shielding window portion provided with. 2. The welding protection surface according to claim 1, further comprising a photodetector for detecting harmful flash light during the welding.