JPH04131838U - proximity switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a proximity switch that reduces malfunctions and failures due to changes in detection distance, is easy to clean, and is easy to replace. [Structure] Only the cap that forms the sensitive surface is integrally molded from fluororesin, and the housing into which this cap fits is formed from metal, and the outer periphery of the cap and the outer periphery of the nut and washer that are screwed into it are made of fluororesin. The cable is coated, and the outer sheath of the cable is made of silicone resin, which allows for easy cleaning even if welding spatter adheres to the cable.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to the improvement of proximity switches used in welding sites and the like.

0002

[Conventional technology]

Proximity switches conventionally used at welding sites such as regular welding machines and robot welding machines. Many of the caps of the caps are made of polyacetal resin or the like.

0003

[Problems with conventional technology]

Therefore, it is susceptible to the effects of spatter generated during welding. Especially forming a sensitive surface If the cap is made of polyacetal resin, etc., the spatter may be on the sensitive surface. If the spatter sticks to the surface and solidifies, the proximity switch will cover the solidified spatter. It has the disadvantage that it can be detected as a detection object and prevents normal operation, and the proximity switch If spatter is attached to the outer periphery of the housing, remove the housing and tightening nut. There is a device that fixes the switch or washer, but this is not necessary when replacing the proximity switch. You may not be able to remove the cable, and the spatter may attach to the cable. If it does, the outer cover is generally made of soft vinyl chloride. , there is a risk that the outer covering may melt. To solve this drawback, the housing and sensitive surface are integrated with fluorocarbon resin. At the same time, a threaded part is provided on the outer periphery, and a fluorine resin fastener is attached to this threaded part. There are some screwed nuts, but the strength of the installation is extremely weak. Therefore, there is a drawback that the range of practical use is limited.

0004

[Problem that the idea aims to solve]

If spatter adheres to the outer periphery of the proximity switch housing, remove the The problem is that the detection distance changes.

[0005]

[Means to solve the problem] In this idea, only the cap that forms the sensitive surface is integrally molded from fluororesin. In addition, the housing into which this cap fits is made of metal, and the outside of the housing is made of metal. A coat of fluorine resin is applied to the periphery of the nut and washer that are screwed together. The outer sheath of the cable is made of silicone resin. Even if welding spatter adheres to it, it can be easily cleaned.

[0006]

【Example】

An embodiment of this invention will be described below with reference to the drawings. That is, in FIGS. 1 to 3, a cylindrical housing 1 made of metal is shown. A threaded portion 3 is formed along the axial center line on the outer periphery of the Metal nuts 4, 4 are screwed together. Furthermore, between these nuts, the housing 1 is fitted with metal washers 6, 6. Furthermore, one end of the housing 1 is integrally molded with fluororesin, and its bottom wall A cap 8 having a sensitive surface 7 is fitted thereon. Inside this cap is coil 9. , a core 10 holding this coil is housed in close proximity to the sensitive surface, thereby allowing the detection An exit portion 11 is configured. Furthermore, inside the housing 1 there is a switch as well as a detection part 11. An electronic circuit board 13 forming a switching circuit is housed therein. This electronic circuit board does not work An indicator light 14 is provided, and a display window is provided in the housing 1 corresponding to the operation indicator light. 15 are provided. Also, one end of the cable 16 is inserted into the housing 1 from the other end. and is electrically connected to the electronic circuit board 13 at the other end. and The jacket 17 of the cable 16 is made of silicone resin. Furthermore, housing 1 At the other end, a sealing member 18 is provided between the housing and the cable 16. This is what controls the seal between the two.

[0007]

[Effect of the idea]

As mentioned above, this device fits into one end of a cylindrical metal housing. Since the cap is made of fluororesin, there is no risk of welding spatter on the sensitive surface. Even if it gets worn, it can be easily removed. Especially in this idea, the sensitive surface is formed. The cap itself is made of fluororesin, so a separate protective cover is required. There is no need to provide a Also, the outer periphery of the housing and the metal material for tightening that fits into this housing. The nuts and washers are coated with fluororesin, making it easy to weld. Even if spatter adheres to the outer periphery of the housing, it can be easily cleaned and removed when replacing the switch. This prevents the nuts and washers from coming off, and makes it easy to install the switch. You can get enough strength by hitting it. On the other hand, since the outer sheath of the cable is made of silicone resin, welding spatter is prevented from forming on the cable. This has the advantage that there is no risk of the outer covering melting even if exposed to cables.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a proximity switch in this invention.

FIG. 2 is a plan view showing an embodiment of the proximity switch in this invention.

FIG. 3 is a front view showing an embodiment of the proximity switch in this invention.

[Explanation of symbols]

1 Housing 3 Threaded part 4 Nut 6 Washer 7 Sensitive surface 8 Cap 9 coil 11 Detection section 13 Electronic circuit board 14 Operation indicator light 15 Display section 16 Cable 17 Outer cover 18 Seal member

Claims (4)

[Scope of utility model registration request] [Claim 1] A cap (8) forming a sensitive surface (7) at one end of a cylindrical metal housing (1).
and a detection section (11) is provided in the housing (1) close to the sensitive surface (7), and a switching circuit is formed in the housing (1) together with the detection section (11). In a device that houses an electronic circuit board (13) and further connects one end of a cable (16) introduced from the other end of the housing (1) to the electronic circuit board, the cap (8) itself is made of fluororesin. Formed proximity switch. [Claim 2] A cap (8) forming a sensitive surface (7) at one end of a cylindrical metal housing (1).
and a detection section (11) is provided in the housing (1) close to the sensitive surface (7), and a switching circuit is formed in the housing (1) together with the detection section (11). In a device that houses an electronic circuit board (13) and further connects one end of a cable (16) introduced from the other end of the housing (1) to the electronic circuit board, the outer periphery of the housing (1) is coated with fluororesin. Proximity switch with coating. [Claim 3] A cap (8) forming a sensitive surface (7) at one end of a cylindrical metal housing (1).
and a detection section (11) is provided in the housing (1) close to the sensitive surface (7), and a switching circuit is formed in the housing (1) together with the detection section (11). In a device that houses an electronic circuit board (13) and further connects one end of a cable (16) introduced from the other end of the housing (1) to the electronic circuit board, the jacket (17) of the cable (16) A proximity switch made of silicone resin. 4. A cap (8) forming a sensitive surface (7) at one end of a cylindrical metal housing (1).
and a detection section (11) is provided in the housing (1) close to the sensitive surface (7), and a switching circuit is formed in the housing (1) together with the detection section (11). An electronic circuit board (13) is accommodated, and one end of a cable (16) introduced from the other end of the housing (1) is connected to this electronic circuit board, and a metal nut is attached to the outer periphery of the housing (1). (4) and a washer (6), wherein the nut (4) and the washer (6) are coated with fluororesin.