Welding pin holding member

Abstract

To provide a welding pin holding member capable of confirming a fixed state of a welding pin more efficiently and effectively than before.SOLUTION: A holding piece 11 for locking the outer peripheral part of the washer part 32 of the welding pin 3 is provided, the holding piece 11 has prescribed bending elasticity, and the holding state of the welding pin 3 is released by pulling the welding gun 2 with prescribed strength from the holding state of the welding pin 3 for locking the washer part 32.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a welding pin holding member capable of holding a welding pin attached to a welding gun. [Background technology]

[0002] Stud welding has been known as a method for fixing a fire-resistant coating material to a metal substrate such as a steel frame. A welding gun disclosed in Patent Document 1 is commonly used as a device for performing the stud welding.

[0003] That is, a welding pin can be attached to the power supply plug of the welding gun by a magnet, and the welding pin is welded by bringing the tip of the pin that has penetrated the fire-resistant coating into contact with the base material and discharging the electric charge supplied from the power supply. With this welding gun, it is possible to weld the welding pin to the metal base material, and the fire-resistant coating material is fixed to the metal base material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-015017 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the welding pin is not properly welded to the metal substrate and a welding defect occurs in the welded pin as described above, there is a risk that the welding pin will fall off the metal substrate or fire-resistant coating due to the effects of vibration or wind. If the welding pin falls and lands with its tip facing up, a person could step on it and suffer serious injury. Therefore, in the past, workers had to palpate each welded pin during welding or pass an inspection current through the welding pin after welding to check the weld condition. This required a lot of work for the worker.

[0006] SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a welding pin holding member that allows the fixed state of a welding pin to be confirmed more efficiently and effectively than conventionally possible. [Means for solving the problem]

[0007] One embodiment of the present invention is a welding pin holding member that is provided on a welding gun capable of welding welding pins, and that has a holding piece that engages the outer periphery of the washer portion of the welding pin, and the holding piece has a predetermined elasticity, and when the welding gun is pulled with a predetermined strength from the holding state of the welding pin that engages the washer portion, the holding state of the welding pin is released.

[0008] Furthermore, in one embodiment of the present invention, the weld pin holding member is characterized in that the holding piece has a locking protrusion that protrudes toward the center of the washer portion and locks the outer peripheral end of the washer portion.

[0009] Furthermore, in one embodiment of the present invention, the welding pin holding member is a welding pin holding member that is provided on a power supply plug of the welding gun.

[0010] Furthermore, in one embodiment of the present invention, there is provided a weld pin holding member characterized in that the number of the holding pieces is plural.

[0011] Furthermore, in one embodiment of the present invention, the welding pin holder includes a holder piece support portion on which the plurality of holder pieces are supported, and a fixing portion for fixing the welding pin to the power supply plug, and is detachable from the power supply plug. [Effects of the Invention]

[0012] According to the present invention, a plurality of retaining pieces are provided that have a predetermined bending elasticity and lock onto the washer portion of the welding pin, and the retaining pieces are configured to release the welding pin from its holding state where the washer portion is locked when the welding gun is pulled with a predetermined strength. This makes it possible to efficiently and effectively check for defective welding by simply pulling the welding gun after welding, without the need for a worker to palpate the welding after welding as in the conventional method.

[0013] Furthermore, the weld pin holder of the present invention can be attached to a conventional welding gun or a welding gun power supply plug, eliminating the need for an inspection gun for inspecting the weld condition or a mechanism for supplying an inspection current, making it possible to provide a low-cost, highly versatile means for inspecting the weld condition. [Brief explanation of the drawings]

[0014] [Figure 1] 1A is a side view of a welding pin holder attached to a power plug, and FIG. 1B is a front view of the welding pin holder according to one embodiment of the present invention. [Figure 2] 3A to 3C are side views of a weld pin holding member according to an embodiment of the present invention, viewed from various directions. [Figure 3] FIG. 4 is a side view illustrating a holding piece according to an embodiment of the present invention. [Figure 4] 1A to 1C are diagrams illustrating a series of operational modes for checking the fixed state of a welding pin in one embodiment of the present invention. [Figure 5] 1A and 1B are diagrams illustrating a series of operation modes when a welding pin is poorly welded in one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a welding pin holder according to the present invention will now be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following embodiment.

[0016] Regarding the welding pin holding member 1 of one embodiment of the present invention, FIG. 1(a) shows a side view of the welding pin holding member 1 attached to the power supply plug 21 of the welding gun 2, and FIG. 1(b) shows a front view of the welding pin holding member 1.

[0017] 2 shows side views of the weld pin holding member 1 from various directions, and FIG. 3 shows side views of the holding piece 11. As shown in FIG.

[0018] 1 to 3, welding pin holding member 1 of this embodiment is provided on welding gun 2 capable of welding welding pin 3 shown in Fig. 4 etc., and has a plurality of holding pieces 11 that have a predetermined elasticity (bending elasticity) and lock washer portion 32 of welding pin 3, and is characterized in that holding pieces 11 release the holding state of welding pin 3 from a state in which welding pin 3 is held by locking washer portion 32 when welding gun 2 is pulled with a predetermined strength. Washer portion 32 has a shape, for example, a washer-type shape formed into a shallow dish.

[0019] Explaining in more detail, welding pin holding member 1 of this embodiment is made of stainless steel and, as shown in Fig. 1(a), is configured to be attachable to and detachable from power plug 21 of welding gun 2. Furthermore, welding pin holding member 1 has a plurality of (three in this embodiment) holding pieces 11 for holding welding pins 3, fixed to annular holding piece support portion 12. Each of the plurality of holding pieces 11 is fixed to holding piece support portion 12 at equal intervals (i.e., 120 degree intervals), for example.

[0020] Furthermore, a fixing portion 112 for fixing the holding piece 11 to the power supply plug 21 is formed on the side of the holding piece 11 facing the power supply plug 21, and is attached to the power supply plug 21 together with the annular holding piece support portion 12 described above.

[0021] In the illustrated embodiment, the welding pin holding member 1 is configured to be detachable from the power supply plug 21. Therefore, even when the power supply plug 21, which is a consumable item, is replaced, the welding pin holding member 1 can be attached to the replaced power supply plug 21.

[0022] The welding pin holder 1 of the present invention is not necessarily limited to the illustrated embodiment. For example, by changing the mounting structure, it is naturally possible to configure it so that it is detachable from the welding gun 2. Furthermore, the welding pin holder 1 of the present invention is not limited to a configuration that is detachable from the welding gun 2. It can also be provided integrally with the power plug 21 or the welding gun 2. The spacing between the multiple holding pieces 11 does not have to be equal. For example, to make it easier to insert the washer portion 32 of the welding pin 3 from the side of the welding pin holder 1, the spacing between two specific holding pieces 11 may be larger than the spacing between the other holding pieces 11. The holding pieces 11 and the holding piece support portion 12 may also be integrally structured so that the holding pieces 11 protrude from the holding piece support portion 12. In this case, the multiple holding pieces 11, the holding piece support portion 12, and the multiple fixing portions 112 are integrally structured.

[0023] 4(a) and the like, the holding piece 11 of this embodiment is provided with a locking protrusion 111 that protrudes toward the center of the washer portion 32 of the welding pin 3 and locks the outer peripheral end of the washer portion 32. More specifically, the locking protrusion 111 is bent with an inclined surface toward the center of the washer portion 32.

[0024] With the above-described configuration of retaining piece 11, when welding gun 2 is pulled with a predetermined strength from the state in which welding pin 3 is held engaging washer 32, retaining piece 11 is deformed outward (in the radial direction of washer 32, in the direction of arrow D2 in FIG. 4(b)), and the outer peripheral end of washer 32 slides on the inclined surface of locking protrusion 111, thereby releasing the held state of welding pin 3. In this embodiment, the held state of welding pin 3 is released by applying a tensile force of, for example, 30 N or more to washer 32.

[0025] 4(a) to 4(c) show a series of operations for checking the fixed state of welding pin 3. First, as shown in Fig. 4(a), welding pin 3 before welding is placed on power plug 21, and welding pin 3 is attracted to power plug 21 by the magnetic force of the power plug, and welding pin 3 is held by welding pin holder 1.

[0026] Next, the welding pin 3 is penetrated through the fire-resistant coating (not shown) and welded to a metal base material 40, such as a steel frame. As shown in FIG. 4(b), once welding of the welding pin 3 is complete, the welding gun 2 is pulled in the direction of arrow D1, causing the welding pin 3 to be pulled by the welding pin holding member 1 (locking protrusion 111). If the pin portion 31 of the welding pin 3 is firmly welded to the metal base material 40, the weld strength of the welding pin 3 to the metal base material 40 exceeds the elastic force (bending elastic force) of the holding piece 11, causing the holding piece 11 to deform outward (in the direction of arrow D2). Finally, as shown in FIG. 4(c), the holding state of the welding pin 3 is released. This indicates that the pin portion 31 of the welding pin 3 is welded to the metal base material 40 with sufficient strength.

[0027] In this embodiment, the bending elastic force of the holding piece 11 is configured such that the holding state of the welding pin 3 is released when a tensile force of 30 N or more is applied, and when the holding state of the welding pin 3 is finally released, it can be confirmed that there are no welding defects in the welding pin 3.

[0028] On the other hand, as shown in FIG. 5( a), after welding of the welding pin 3 is completed, the welding gun 2 is pulled in the direction of arrow D1, and the welding pin 3 is pulled by the welding pin holding member 1, causing the holding piece 11 to deform slightly outward (in the direction of arrow D2). However, if there is a welding defect in the pin portion 31 of the welding pin 3, the welding strength of the welding pin 3 to the metal base material 40 becomes less than the bending elastic force of the holding piece 11, and as shown in FIG. 5( b), the tip of the pin portion 31 breaks before the holding state of the welding pin 3 is released, and the holding state of the welding pin 3 is ultimately not released. In other words, the welding pin 3 comes off the metal base material 40, but the welding pin 3 remains held by the welding pin holding member 1. This allows immediate confirmation that there is a welding defect in the welding pin 3.

[0029] As described above, the present invention makes it possible to efficiently and effectively check for the presence or absence of a welding defect in the weld pin 3 simply by pulling the welding gun 2 after welding, without the need for an operator to palpate it as in the conventional case.

[0030] Furthermore, since the weld pin holder 1 of the present invention can be attached to a conventionally used welding gun 2 or power supply plug 21 of the welding gun 2, there is no need for an inspection gun for inspecting the welding condition or a mechanism for supplying an inspection current. Therefore, it is possible to provide a low-cost, highly versatile means for inspecting the welding condition.

[0031] (Other embodiments) Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and the following modifications are also possible, for example.

[0032] In the embodiment of the weld pin holder 1 described above, three holding pieces 11 are provided, but the number is not necessarily limited to this as long as the configuration allows for checking for the presence or absence of a welding defect. That is, the number of holding pieces 11 may be two or more, or may be one. When there is one holding piece 11, the holding piece 11 may have a shape such as a semicircular ring that can lock the washer portion 32.

[0033] Furthermore, in this embodiment, the weld pin holding member 1 is made of stainless steel, but this is not necessarily limited to this, and it may be made of other metals or resins, for example.

[0034] In this embodiment, as shown in Fig. 3 etc., a plate-like member is bent to form the locking protrusion 111 on the holding piece 11. Although such a configuration can reduce the processing time and manufacturing costs, the present invention is not necessarily limited to such a processing method.

[0035] In this embodiment, the welding pin 3 is released from its held state when a tensile force of 30 N or more is applied, but this is not necessarily limited to this, and the holding strength can be set as needed. Specifically, the holding strength of the welding pin 3 can be changed by adjusting the bending elasticity by changing the plate thickness and plate width of the holding piece 11 of the welding pin holding member 1.

[0036] Furthermore, the manner in which the weld pin holder 1 is installed in the above-described embodiment is merely an example, and the manner in which it is attached to the power plug 21 or the welding gun 2 can be changed as appropriate.

[0037] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and includes all modifications within the meaning and scope of the claims. Furthermore, the specific methods described in the above examples can be modified within the scope of solving the problems of the present invention. [Explanation of symbols]

[0038] 1 Weld pin holding member 11 Holding piece 111 Locking protrusion 112 Fixed part 12 Holding piece support part 2 welding guns 21 Power plug 3 welding pins 31 Pin section 32 Washer part 40 Metallic substrate

Claims

1. A welding pin holding member provided in a welding gun capable of welding a welding pin, a retaining piece for retaining an outer periphery of the washer portion of the welding pin; The holding piece has a predetermined elasticity, and when the welding gun is pulled with a predetermined strength from a state in which the welding pin is held by the washer portion, the holding piece releases the holding state of the welding pin. A welding pin holding member characterized by:

2. The holding piece has a locking projection that protrudes toward the center of the washer and locks the outer peripheral edge of the washer.

2. The weld pin holder of claim 1.

3. The welding pin holding member is provided on the power supply plug of the welding gun.

3. The weld pin holder according to claim 1 or 2.

4. The number of the holding pieces is plural.

4. The weld pin holder of claim 3.

5. The welding pin holder has a holder piece support portion on which the plurality of holder pieces are supported and a fixing portion for fixing the welding pin to the power supply plug, and is detachable from the power supply plug.

5. The weld pin holder of claim 4.

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