JP2002166331A - Holder for bolt welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly insert a shaft part in a main cylinder at the time of welding a bolt on a target point by receiving the shaft part of the bolt in the main cylinder and prevent falling of the bolt from the main cylinder by certainly holding it in the main cylinder. SOLUTION: A magnet 27 is stored in a transmission member 11 and an inside diameter of the main cylinder is set larger than an outside diameter of the shaft part 17 on a device of a type to actuate a detection switch 4 as the shaft part 17 of the bolt 16 inserted into the main cylinder 1 pushes the transmission member 11 in it by setting a working element of the detection switch and the transmission member making contact with this working element in the main cylinder to correspond to the above demand. Additionally, the magnet 27 is stored in the transmission member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION It has been practiced to hold a bolt in a main cylinder, move the bolt to a target location, and weld the bolt to a counterpart component. The present invention belongs to such a technical field.

[0002]

2. Description of the Related Art FIGS. 1 and 3 show an embodiment of the present invention. The prior art will be described with reference to these drawings. FIG.
1 is a partial longitudinal side view showing a conventional technique. The main cylinder 1 made of a copper alloy has a circular cross section, and has a small diameter portion 2 and a large diameter portion 3. The detection switch 4 is connected to the main cylinder 3, and the cylinder part 5 is screwed into the large-diameter part 3 via the screw part 6. The operating element 7 for opening and closing the detection switch 4 is a circular roller type, and the operating element 7 is attached to the reciprocating piece 8 by a rotating shaft 9. The detection switch 4 outputs a signal when the operator 7 is pressed. Reference numeral 10 denotes an electric wire extending from the detection switch 4.

The transmission member 11 is a columnar member, and is formed integrally with the stopper flange 12. A step portion 13 is provided at a boundary between the large diameter portion 3 and the small diameter portion 2, and the stopper flange 12 comes into contact with the step portion 13. The return spring (not shown) incorporated in the detection switch 4 causes the actuator 7 to move the stopper flange 12
, Whereby the flange 12 is in close contact with the step portion 13. The holding body 14 is firmly fixed to the main cylinder 1 and is connected to the robot arm 15.

[0004] The bolt 16 comprises a shaft portion 17 and a flange 18, and the flange 18 is welded to a counterpart member.
Reference numeral 20 denotes the welded portion, and the counterpart member is a circular pipe. The welding here is arc welding. Shaft 1
7 is inserted into the small diameter portion 2 to hold the bolt to the main cylinder 1. This insertion is performed using a supply rod 21 as shown in FIG. FIG. 1 shows the operation of the robot arm 15,
The bolt 16 has reached a predetermined position of the circular pipe 19, and the welding has been completed.

FIG. 4 shows a method of holding a bolt at the small diameter portion 2, which is an elastic clamping method. This is a collet type chuck. Four slits 22 are provided in the cylinder in the axial direction, and the tip 23 has a slightly smaller diameter. Accordingly, reference numeral 24 denotes the entire collet, 25 denotes an elastic portion, 26 denotes a cylindrical portion, and the cylindrical portion 2
6 is strongly pressed into the small diameter portion 2.

The bolt 16 held on the supply rod 21
The shaft 17 is inserted into the collet 24. At this time, the shaft portion 17 is pushed into the small diameter portion 2 while expanding the distal end portion 23 and expanding the entire elastic portion 25. As a result, the shaft portion 17 pushes down the actuator 7 via the transmission member 11, and the detection switch 4 operates to send out a signal from the electric wire 10. The reason why the signal is extracted from the detection switch 4 when the shaft portion 17 enters as described above is to confirm that the bolt 16 is certainly inserted into the small diameter portion 2. If the welding operation is performed with the bolt 16 missing,
Since the parts are flowed to the post process without the bolt 16,
A rework process is required.

[0007]

When the shaft portion of the bolt is sandwiched in an elastic manner as described above, a pressing force must be applied to the inside of the small diameter portion when the shaft portion is inserted. . Applying such a force to the bolt supply means, for example, to the supply rod, requires an additional mechanism, which is disadvantageous in terms of simplification of equipment and operational reliability.

[0008]

[Means for Solving the Problems and Their Functions] The present invention has been proposed to solve the above-mentioned problems.
An actuator of the detection switch and a transmission member in contact with this operator are installed in the main cylinder supported by the robot arm, etc., and the shaft of the bolt inserted into the main cylinder pushes the transmission member to detect. In a type in which the switch is operated, a magnet is housed in the transmission member, and the inner diameter of the main cylinder is set to be larger than the outer diameter of the shaft portion.

With the above-described configuration, when the shaft of the bolt is inserted into the small diameter portion, the above diameter difference is set, so that the shaft can be smoothly inserted without any snag or resistance. . Therefore, it is not necessary to cause the bolt supplying means to perform the pushing operation, which is effective for simplifying the equipment. Further, since the magnet is housed in the transmission member, when the shaft is inserted, the magnet sucks the shaft toward the back of the small-diameter portion, so that the insertion is further smoothly performed. Also, no matter what direction the main cylinder is tilted or turned upside down, the bolts do not accidentally come off because the shaft is attracted by the magnet.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. Those that perform the same functions as the members already described are denoted by the same reference numerals in the drawings,
Detailed description is omitted. That is, only differences from the related art will be described. The transmission member 11 houses a magnet 27, and the inner diameter of the main cylinder 1 is set to be larger than the outer diameter of the shaft 17. The magnet 27 is embedded in the portion of the stopper flange 12, covered with a cover plate 28, and welded at a portion indicated by reference numeral 29. Further, as shown in the figure, the main cylinder at the position where the shaft 17 is inserted, that is, the inner diameter of the small diameter portion 2 is set to be larger than the outer diameter of the shaft 17. The resulting diameter difference is represented as a gap 30 as shown.

The bolt 16 is made of iron which is a magnetic material. In order to strongly apply the magnetic force of the magnet 27 to the bolt 16, the stopper flange 12, the cover plate 28, the transmission member 1
1, the actuator 7 and the like are made of stainless steel which is a non-magnetic material.

When the shaft portion 17 is inserted into the small diameter portion 2,
The attraction force of the magnet 27 acts on the shaft 17 to assist insertion. In the transitional period of the insertion, the shaft portion does not touch anything, or is light even if it touches, so that smooth insertion is performed. At the end of insertion, the tip of the shaft 17 is
Then, when the actuator is slightly depressed, the detection switch 4 issues a signal indicating that "there is a bolt". The next operation, for example, movement of the robot is started by this signal.

[0013]

According to the present invention, an operation switch of a detection switch and a transmission member in contact with the operation switch are installed in a main cylinder supported by a robot arm or the like, and a bolt inserted into the main cylinder is provided. Wherein the shaft portion pushes the transmission member to operate the detection switch, wherein the transmission member accommodates a magnet and the inner diameter of the main cylinder is set to be larger than the outer diameter of the shaft portion. .

With the above configuration, when inserting the shaft portion of the bolt into the small-diameter portion, since the above-described diameter difference is set, the shaft portion can be smoothly inserted without any snag or resistance. . This eliminates the need for the bolt supply means to perform the pushing operation, which is effective for simplifying the equipment. Further, since the magnet is housed in the transmission member, when the shaft is inserted, the magnet sucks the shaft toward the back of the small-diameter portion, so that the insertion is further smoothly performed. Also, no matter what direction the main cylinder is tilted or turned upside down, the bolts do not accidentally come off because the shaft is attracted by the magnet.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a transmission member.

FIG. 3 is a longitudinal sectional side view showing a state where a bolt is pushed in.

FIG. 4 is a partial vertical side view showing a structure of a collet.

[Explanation of symbols]

 15 Robot arm 1 Main cylinder 4 Detection switch 7 Actuator 11 Transmission member 16 Bolt 17 Shaft 27 Magnet

Claims (1)

[Claims] An operating member of a detection switch and a transmission member in contact with the operating member are installed in a main cylinder supported by a robot arm or the like, and a shaft of a bolt inserted into the main cylinder is transmitted. A holder for bolt welding, wherein a magnet is accommodated in a transmission member and an inner diameter of a main cylinder is set to be larger than an outer diameter of a shaft portion in a type in which a detection switch is operated by pushing a member.