JPS63165078A - Welding device for long-sized stud - Google Patents

Abstract

PURPOSE:To speed up a welding operation and to improve the accuracy of welding by providing a stud grasping mechanism to the titled device and disposing a mechanism to pull up and push a stud so as to offset from the axial line of the stud thereto. CONSTITUTION:An arc shield holding body 4 is mounted to the front end of a base plate 1 and a pedestal 6 which slides longitudinally via a holding base 5 is installed in the middle of the plate 1. The grasping mechanism 12 to grasp the part near the top end of the stud 11 is provided on the pedestal 6 so that the stud 1 is clamped or unclamped by means of a grasping cylinder 13. The long-sized stud 11 is first inserted into the opened grasping mechanism 12 and is clamped by the cylinder 13. A power supply is turned on to pull up the pedestal 6 once by a set distance, then the stud 11 is unclamped and is pushed to the base metal. Welding is thus executed. Since the stud 11 is exactly positioned and welded, the welding operation is speeded up and the accuracy of welding is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a stud welding device, and in particular to a stud welding device useful for welding long and heavy studs such as stud welding to steel pipe sheet piles. Related.

(Prior Art) As a conventional stud welding device, a gun type device is known as shown in FIG. This stud gun includes a stud lifting mechanism (usually an electromagnetic solenoid) 2 for pulling up the stud 22 during welding in the housing 21.
3. Spring for pushing stud 24. A shaft body 26 that is slidable by this stud lifting mechanism, a stud holder 27 that is fitted to the tip of the shaft body, and a support tool 28 that is attached to the housing 21 are provided with a welding current power supply part 25 that protrudes outside the housing.
The arc shield holding member 30 is attached through the arc shield 29 and extends to the vicinity of the tip of the stud to hold the arc shield 29. In these configurations, stud 22. Stud holder 27. Shaft body 26. The stud pulling mechanism 23 was arranged in a straight line.

(Problems to be Solved by the Invention) The conventional welding apparatus described above is convenient for welding relatively short studs. However, in recent years, as stud welding has been applied to steel pipe sheet piles and the like, long (1 m to 1.5 m), large diameter (16 to 25 m+n), heavy stud welding has become desirable. However, since the conventional stud welding has the above-mentioned configuration, it has the following problems.

■The distance between the welding equipment and the tip of the stud is long, making it difficult to align it with the welding point on the base metal.

■As shown in Figure 4, the stud holder 27 holds the stud with a plate having spring properties, so if the weight of the stud is heavy, it cannot hold the stud securely, causing slippage and welding. This may cause defects.

■The stud holding length by the stud holder cannot be made too long, and the stud becomes bent, resulting in incomplete stud pushing and defective welding (especially in the case of horizontal rods).

■It is not easy to install studs and arc shields.

■It is difficult to automate stud welding.

■If the length of the stud changes, the protrusion amount 1 of the stud from the tip of the arc shield will change, causing welding defects. Therefore, adjust the length of the support 30, and
(usually 3 to 5+1111) needs to be constant.

The present invention solves these problems and provides a highly reliable and economical stud welding device that can reliably weld long and heavy studs to predetermined locations without causing welding defects. With the goal.

(Means for Solving the Problems) The present invention for achieving this object is configured as follows. That is, in a stud welding device having a stud clamping mechanism, a welding current power supply unit, and a stud pulling/pushing mechanism during welding, the stud pulling/pushing mechanism is offset with respect to the axis of the stud clamped by the stud clamping mechanism. This is a long stud welding device characterized by the following.

(Function) In the present invention, the stud pulling/pushing mechanism is offset with respect to the axis of the stud, so unlike the conventional method, the part near the tip of the stud can be held, and even long studs can be held without bending. In addition to the retaining bracket, the stud and arc shield can be installed at almost the same location.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

An arc shield holder 4 having a groove 3 for holding an arc shield 2 is attached to the tip of the rectangular base 1, and a pedestal 6 is mounted in the middle of the base 1 via a holder 5. The base 1 is held slidably in the longitudinal direction (stud axis direction). As shown in the figure, the sliding mechanism of the pedestal 6 includes a slide shaft 7 provided at the bottom of the pedestal 6 supported by a bearing 8 placed on the holding table 5, and a cylinder 9 for sliding the pedestal placed on the base 1. The cylinder rod 9A is connected to the pedestal 6. Furthermore, at the rear end of the base 1 there is a stand Fi6.
A stopper 10 for controlling the amount of retraction is fixed.

A spring 16 is housed in the rear end of the pedestal 6, and is biased between it and the stopper 10, and presses the pedestal 6 forward. Bin 1 fitted to stopper IO
A hanger 18 is rotatably supported at 7 . One end of the hanger I8 is engaged with a holding pin 19 provided on the base 6 to control the forward movement of the spring 16 and fix the initial position of the base 6. That is, the hanger 18 allows the pedestal 6 to be set back in advance by the amount of protrusion from the tip of the arc shield, and by holding the stud with the tip of the stud substantially aligned with the tip of the arc shield, the length of the stud can be reduced. It is possible to obtain a constant amount of protrusion even if the height changes.

On the other hand, a clamping mechanism 12 for clamping the tip of the stud 11 is installed on the pedestal 6, and the clamping mechanism 12
can be opened and closed, for example, by a clamping cylinder 13 provided on the lower surface of the pedestal 6, so that the stud can be clamped or released. Further, a pedestal 14 for holding the rear of the stud clamping mechanism is also placed on the pedestal 6.

Note that I5 in the figure is a fluid pressure intake port for driving a cylinder attached to the rearmost end of the base 1. As the fluid pressure cylinder in the present invention, it is preferable to use an air cylinder.

In the illustrated embodiment, the pedestal 6°, the slide shaft 7, the bearing 8. The sliding cylinder 9 constitutes a stud lifting/pushing mechanism, and the lifting/pushing mechanism is provided offset with respect to the stud axis. This pulling/pushing mechanism is not limited to the structure shown in the drawings, as long as it is offset from the stud axis, and other mechanisms may be used, for example, separate cylinders may be used for pulling and pushing. Further, other mechanical means other than the cylinder can also be used. Although not shown, it is desirable that the stud lifting amount and pushing amount can be adjusted as appropriate.

Furthermore, the mechanism for clamping the stud is not limited to one but may be multiple, and the drive source for clamping does not need to be limited to a cylinder, as long as it can firmly clamp the stud. Any type of mechanism may be used.

Next, the operation of the illustrated device will be explained.

After the device of the present invention is set in a predetermined position with respect to the base material by appropriate fixing means, the long stud 11 is inserted into the open holding mechanism 12, and its tip is inserted into the groove 3 of the arc shield holder 4. The stud is clamped by operating the clamping cylinder 13 at a position that substantially coincides with the tip of the engaged arc shield 2.

When the welding power source is turned on in this state, an arc is generated between the tip of the stud 11 and the base metal, and the pedestal sliding cylinder 9 is activated to move the pedestal 6 in the opposite direction of the base metal (toward the right in the drawing). move it. Due to this operation of the cylinder 13, the stud 11 is pulled up by a preset distance and held and fixed there, but at this point a main arc is generated and the base material melts, and after a predetermined period of time, the stud 11
Operate in the opposite direction to push the stud into the base metal. At this time, the holding pin 19 rotates the hanger 18 around the bin I7 as the pedestal 6 moves toward the base material, so that the movement of the pedestal is not hindered. As a result, the stud 11 is welded to the base metal. After welding is complete, turn off the power and release the stud. In addition, in order to perform stud welding without defects, it is necessary to push the stud into the base metal sufficiently.

(Effects of the Invention) According to the present invention described above, the following effects can be achieved.

■Since the stud lifting/pushing mechanism is offset from the axis of the stud held by the stud holding mechanism, long studs can be easily welded.

■Since the vicinity of the tip of the long stud can be held, it is easy to align it to the welding point on the base metal.

In addition, since the stud does not bend, strong pressing of the stud against the base metal surface allows for forceful and accurate welding, and there are no welding defects.

■Since the stud can be held in the stud welding device, welding work can be done quickly. In addition, since the stud is held between the studs by fluid pressure, there is no slippage of the stud during welding, and long and heavy studs can be reliably welded.

■Welding of long studs can be automated by simply attaching the base to a transfer device that can move it along the base material.

■It is sufficient to hold the stud so that the stud tip almost matches the arc shield tip, and there is no need to adjust the amount of protrusion of the stud from the arc shield tip each time the stud length changes. A highly reliable welding state without welding defects can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the welding device according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a schematic diagram showing a specific example of a conventional stud gun, and FIG. FIG. 4 is a perspective view showing the stud clamping means in the device of FIG. 3; DESCRIPTION OF SYMBOLS 1... Base, 2... Arc shield, 3... Concave groove, 4... Arc shield holding body, 5... Holding stand, 6
... Pedestal, 7... Slide shaft, 8... Bearing, 9... Pedestal sliding cylinder, 10-... Stopper,
11... Stud, 12... Clamping mechanism, 13-...
Clamping cylinder, +4-...Stud holder.

Claims (1)

[Claims] In a stud welding device having a stud clamping mechanism, a welding current power supply part, and a stud pulling/pushing mechanism during welding, the stud pulling/pushing mechanism is provided offset with respect to the axis of the stud clamped by the stud clamping mechanism. Long stud welding equipment featuring: