JP3211522U - Lower electrode mechanism for welding - Google Patents

Abstract

The present invention provides a welding lower electrode mechanism that reduces the size of an apparatus and reduces restrictions such as a place of use and welding conditions. A lower electrode 5 can be mounted on an upper part of an electrode holder 4 and a biasing means 7 is disposed in a cylinder of the electrode holder 4 to bias a spring seat 8 upward. In addition, the rod 9 is integrated with the positioning pin 6 on the upper part of the spring seat 8, and the support cylinder 3 is disposed below the electrode holder 4. A sensor holding cylinder 15 that holds a slide sensor 16 capable of measuring the stroke position of the rod 9 is disposed in the cylinder of the support cylinder 3. At this time, a water cooling mechanism may be built in the electrode holder 4, and a cooling ring may be attached to the outer periphery of the electrode holder 4. [Selection] Figure 3

Description

  The present invention relates to a technique for downsizing and further simplifying a lower electrode mechanism suitable for use in combination with an upper electrode mechanism, for example, for welding with a nut.

  Conventionally, as a welding apparatus for attaching a nut to a plate-shaped workpiece such as a steel plate, the present applicant has a simple configuration capable of more accurately measuring the position of a positioning pin for positioning the nut at a predetermined position during welding. (See, for example, Patent Document 1). In this technique, a positioning pin for positioning a nut is urged upward by a spring through a rod in an electrode holder, and a vertical stroke position of the rod is detected by a sensor disposed in a lower portion of the rod. Thus, the position of the positioning pin is determined.

Japanese Patent No. 4424755.

  However, in the case of the above technique, as a technique for disposing the sensor below the rod that moves up and down, the sensor is disposed independently of the welding apparatus main body via an insulating member or the like. Therefore, there is a problem that it is easy to be restricted by the place of use and welding conditions.

  In view of this, the present invention has an object to reduce the height of the entire welding apparatus, in particular, so as to eliminate the restriction of the place of use and the restriction of welding conditions, and to expand the applicable range.

  In order to solve the above problems, the present invention provides a lower electrode that can be mounted on an upper portion of an electrode holder, a biasing member that is disposed in a cylinder of the electrode holder and is biased upward by a biasing means, A rod that extends downward from the biasing member and is integrated with the biasing member; a positioning pin that is mounted on the upper portion of the biasing member and has a tip protruding upward from the lower electrode through the insertion hole of the lower electrode; In the lower electrode mechanism for welding provided below the electrode holder and supporting the electrode holder, the positioning pin is provided in the cylinder of the support cylinder by measuring the stroke position of the rod. Built-in slide sensor to determine the height position of.

Thus, by incorporating the slide sensor for measuring the height position of the positioning pin in the cylinder of the support cylinder, the height becomes particularly low and it is possible to make it difficult to receive various restrictions on the welding conditions.
Here, the slide sensor is preferably, for example, a resistance sensor that detects a change in resistance value by a detector that is slidable along the slide portion on the sensor body side and changes the slide position. By directly connecting the detector to, for example, a vertically moving rod, a structure with a simpler configuration and accurate measurement can be achieved.

  In the present invention, the electrode holder has a built-in water cooling mechanism, and the support tube has a water supply / drain opening for circulating cooling water through the water cooling mechanism of the electrode holder and the tube of the electrode holder. An air supply port for feeding pressurized air was formed.

  Thus, if the electrode holder has a built-in water cooling mechanism and a supply / drain port for circulating cooling water in the support cylinder and an air supply port for sending pressurized air into the electrode holder cylinder, Further downsizing can be achieved.

Further, the restoring force of the spring is mainly used as the biasing means.

  With such a configuration, the height can be further suppressed as compared with, for example, energization using an air cylinder or the like, and the apparatus can be further reduced in size and simplified. Note that the expression “mainly” is because, as the biasing means, in addition to the restoring force of the spring, for example, pressurized air fed into the electrode holder can be used as an auxiliary force.

  By incorporating a slide sensor for measuring the height position of the positioning pin in the support cylinder, the height of the welding device can be particularly reduced, and the size can be reduced to make it difficult to be restricted in use. At this time, a water cooling mechanism is built in the electrode holder, and a supply / drain port for circulating the cooling water in the support cylinder and an air supply port for sending pressurized air into the cylinder of the electrode holder are provided. As a result, the apparatus can be further miniaturized by utilizing the restoring force of the spring.

It is a perspective view which shows an example at the time of showing the lower electrode mechanism for main welding, and incorporating the water cooling mechanism as an electrode holder. It is an internal perspective view of the mechanism. It is a disassembled perspective view of the principal part except the base part of the mechanism. It is a general view which shows an example at the time of using an external cooling mechanism as an electrode holder.

An example of an embodiment of the present invention will be described with reference to the accompanying drawings.
The lower electrode mechanism for welding according to the present invention is reduced in size especially by lowering the height of the entire welding apparatus, so that there is no restriction on the place of use or restriction on welding conditions, and the scope of application can be expanded. For this purpose, a slide sensor for measuring the height position of the positioning pin is incorporated in the support cylinder.

  Therefore, as an example of a welding lower electrode mechanism 1 according to the present invention, an example in which a water cooling mechanism is built in an electrode holder will be described. This welding lower electrode mechanism 1 includes a pedestal 2 as shown in FIG. A support cylinder 3 fixed on the electrode, an electrode holder 4 held on the support cylinder 3, and a lower electrode 5 mounted on the electrode holder 4. An insertion hole 5h penetrating vertically is formed, and the upper portion of the positioning pin 6 protrudes upward through the insertion hole 5h.

  The positioning pin 6 is urged upward by an urging force, which will be described later, and can be moved downward by a predetermined stroke when pressed from the upper side to the lower side. It can be raised to the position shown in FIG.

The electrode holder 4 has a built-in cooling mechanism for cooling the heat generated around the lower electrode 5 during welding, and the cooling mechanism is a double cylinder of an inner cylinder and an outer cylinder as the electrode holder 4. A concave groove is formed between the inner cylinder and the outer cylinder so that the cooling water circulates and flows in the concave groove.
A supply / drain port 3a for feeding cooling water into the concave groove of the double cylinder of the electrode holder 4 is provided in the support cylinder 3 which will be described later, and the supply / drain port 3a on the cooling water supply side has The cooling water feed connecting member 12 is mounted on the drain side water supply / drain port 3a.

  Further, in the cylinder of the electrode holder 4, as shown in FIG. As shown in FIG. 3, the biasing means 7 is for biasing the positioning pin 6 upward, and includes a spring seat 8 as a biasing member and a lower surface of the spring seat 8. A rod 9 fixed to the central portion and integrated, and a spring 10 disposed so as to surround the periphery of the rod 9, are inserted into the cylinder of the electrode holder 4, and are mounted on the spring seat 8. When the positioning pin 6 is placed and then the male screw portion 5n of the lower electrode 5 is screwed into the female screw portion 4n formed at the upper part in the cylinder of the electrode holder 4, the spring 10 is compressed and the positioning pin 6 is moved. It is always urged upward.

  The support cylinder 3 is provided with a fitting portion 3k capable of fitting a part of the lower end portion of the electrode holder 4 on the upper surface thereof, and the aforementioned cooling water is circulated on the opposite side surfaces. For this purpose, a water supply / drain port 3a is provided, through which cooling water can be fed into and drained into the concave groove of the double cylinder of the electrode holder 4.

  Further, an air supply port 3c for sending pressurized air into the cylinder of the electrode holder 4 is provided at a predetermined position on the side surface of the support cylinder 3, and a pressurized air supply connecting member 14 (FIG. 2) is attached. The support cylinder 3 is provided with a wiring through hole (not shown) for taking out a signal of the slide sensor 16 described below.

A slide sensor 16 is incorporated in the cylinder of the support cylinder 3 via a sensor holding cylinder 15.
The sensor holding cylinder 15 is fixed in the cylinder of the support cylinder 3, and as shown in FIG. 3, the sensor holding cylinder 15 includes a fitting portion 15a into which the slide sensor 16 can be fitted, and the slide sensor is attached to the fitting portion 15a. When the 16 is fitted, the detector 16 a of the slide sensor 16 can be connected to a predetermined position of the lower end portion of the rod 9.
The slide sensor 16 is a resistance sensor that slides a slidable detector 16a along a slide portion on the sensor body side and detects a resistance value at the position of the detector 16a.

For this reason, when the rod 9 moves up and down, the detector 16a also slides up and down, and the stroke position of the rod can be detected.
In addition, the connection method etc. of the rod 9 and the detector 16a are arbitrary.

  In this embodiment, an air passage port 15 communicating with the inside of the electrode holder 4 is provided at a corresponding position of the sensor holding tube 15 corresponding to the position of the air supply port 3 c of the support tube 3.

  In the welding lower electrode mechanism 1 as described above, the positioning pin 6 normally protrudes upward through the insertion hole 5h of the lower electrode 5 by the biasing force of the spring 10, but the upper electrode (not shown) is lowered during welding. Then, the positioning pin 6 is pressed through the nut. For this reason, the positioning pin 6 descends by a predetermined stroke, and the descending stroke value is detected by the slide sensor 16 to determine whether or not welding is possible. In such welding work, since the slide sensor 16 is incorporated in the cylinder of the support cylinder 3, the height can be made extremely low compared to the conventional case, and there are no restrictions on the place of use and restrictions on welding conditions. Can expand the application range.

  Next, an example of the lower electrode mechanism 1 for welding that employs an external cooling method without incorporating a water cooling mechanism as the electrode holder 4 will be described with reference to FIG.

  The welding lower electrode mechanism 1 is formed in the cooling ring 18 from a cooling water feed connecting member 12 having a cooling ring 18 fitted around the electrode holder 4 in the vicinity of the lower electrode 5 and connected to the cooling ring 18. The cooling water flows through the cooling water channel and drains from the cooling water drainage connecting member 13 connected to the other part of the cooling ring 18, thereby cooling the electrode holder 4 around the lower electrode 5.

  In this case, only the cooling structure is different, and other configurations, for example, the urging means 7 in the electrode holder 4 and the holding mechanism of the slide sensor 16 in the support cylinder 5 are the same as those in the above example. Even in this case, the height can be made extremely low as compared with the prior art, and the application range can be expanded without the restriction of the place of use and the restriction of the welding conditions.

  In addition, this invention is not limited to the above embodiments. Those having substantially the same configuration as those described in the scope of the claims of the utility model registration of the present invention and exhibiting the same operational effects belong to the technical scope of the present invention. For example, the configuration of the pedestal 2 is arbitrary, and may be a tapered insertion shape that can be attached to any of the attachment portions, or may be another shape.

  Since the height of the welding apparatus is reduced and the size of the welding apparatus is reduced to make it difficult to receive restrictions on the place of use, restrictions on welding conditions, and the like, widespread use is expected in the future.

  DESCRIPTION OF SYMBOLS 1 ... Lower electrode mechanism for welding, 3 ... Support cylinder, 3a ... Supply / drain port, 3c ... Air supply port, 4 ... Electrode holder, 5 ... Lower electrode, 6 ... Positioning pin, 7 ... Biasing means, 8 ... Spring Seat (biasing member), 9 ... rod, 10 ... spring, 16 ... slide sensor, 18 ... cooling ring.

Claims (3)

A lower electrode which can be mounted on the upper part of the electrode holder; a biasing member which is disposed in a cylinder of the electrode holder and biased upward by a biasing means; and extends downward from the biasing member and is biased A rod integrated with the member, a positioning pin mounted on the upper portion of the biasing member and having a tip protruding upward from the lower electrode through the insertion hole of the lower electrode, and disposed below the electrode holder and A welding lower electrode mechanism having a support cylinder for supporting an electrode holder, wherein a height position of the positioning pin is determined by measuring a stroke position of the rod in the cylinder of the support cylinder. A lower electrode mechanism for welding, which has a built-in slide sensor. The electrode holder has a built-in water cooling mechanism, and the support cylinder has a supply / drain port for circulating cooling water through the water cooling mechanism of the electrode holder and a pressurized air to be fed into the cylinder of the electrode holder. The lower electrode mechanism for welding according to claim 1, wherein an air supply port is formed. The welding lower electrode mechanism according to claim 1 or 2, wherein the urging means mainly uses a restoring force of a spring.

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