JPH0641741Y2 - Welding electrode fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure for fixing a welding electrode in an electric heating device that performs processing such as welding by using resistance heating between base materials.

[Conventional technology]

For example, in an electric heating device, as shown in FIG. 4, an electrode 54 as a lower die is installed on a fixed base 52 of the device main body 50,
An electrode 60 as an upper mold is installed on a movable base 58 which is driven to move up and down by a drive shaft 56 so as to face it. Each electrode 54,6
On the facing surface of 0, gripping grooves 54a and 60a corresponding to the shape and size of the workpiece 62 are formed in a divided manner so that the workpiece 62 can be gripped. Another pair of electrodes is installed in the device main body 50 so as to face each of the electrodes 54 and 60, and electricity is supplied between the two sets of electrodes while the workpiece 62 is gripped. Pressure welding is performed. Further, the apparatus main body 50 is provided with annealing electrodes 64 and 66, and when the workpiece 62 is a steel material or the like, the annealing is performed by these electrodes.

Conventionally, the electrodes 54 and 60 are fixed to the apparatus main body 50 by bolts to the fixed base 52 and the movable base 58, respectively.

[Problems to be solved by the device]

By the way, when the shapes and diameters of the workpiece are different, it is necessary to set electrodes having gripping grooves corresponding to the respective shapes and diameters. When replacing the bolt, it is necessary to remove and tighten the bolt each time, which is complicated and the workability is poor.
Further, since the working area of the electrode installation portion of the device is extremely narrow and it is an energizing area, there is a great danger in working.

[Means for Solving the Problems]

In order to solve the above problems, this invention intends to improve the efficiency and safety of the electrode replacement work by facilitating the removal of the fixing member when the electrode is attached to and detached from the apparatus main body. In the fixing structure of the welding electrode for fixing the electrode main body part to the device main body of the electric heating device via the fixing member, the fixing member can be locked to the device main body and a contact surface to the electrode main body part. And a rotatable cam member that expands the fixed main body and locks the fixed main body at any position of the apparatus main body by the expansion. The structure is such that the electrode body is held in a locked state.

[Action]

According to the present invention, the electrode main body is installed at a predetermined position of the apparatus main body, the fixing member is engaged with the apparatus main body, and the cam member is rotated at a position where the fixing member abuts the electrode main body to fix the electrode main body. The member is expanded and locked by the device body due to the deformation caused by the expansion. When the fixing member is locked to the apparatus body, the electrode body is pressed and prevented from falling off, whereby the electrode body is fixed to the apparatus body.

Further, when the electrode body is fixed, the cam member is rotated in a direction to release the expanded state of the fixing member, whereby the locked state of the fixing member to the apparatus body is released and the electrode body can be removed. Become.

〔Example〕

 1 and 2 show an embodiment of this invention.

A projecting edge portion 2a having a T-shaped cross section is formed in the apparatus body 2 of the electric heating apparatus, and a fixing member for engaging with the projecting edge portion 2a and fixing the electrode body portion 4 having the gripping groove 4a. 6 is installed. The fixing member 6 is slidable on the apparatus main body 2 and can be locked, and has a contact surface with which the electrode main body 4 abuts.
And a cam member 10 for expanding the fixed main body portion 8 in the sliding direction. As shown in FIG. 2, the fixed main body portion 8 includes a bolt 12 and slide blocks 14 and 16 inserted into the bolt 12 through insertion holes 14a and 16a. On the lower surfaces of the slide blocks 14 and 16, there are projecting edges so that the slide blocks 14 and 16 can slide in close contact with the apparatus main body 2.
Fitting grooves 14b and 16b corresponding to 2a are formed, and a projection 14c having a small diameter is formed on the back surface of the slide block 14.
c is formed.

The cam member 10 is formed in a cylindrical shape with a peripheral edge partly cut out, and is inserted into the bolt 12 through the insertion hole 10a while being positioned between the slide blocks 14 and 16 of the fixed main body 8. The bolt 12 and the cam member 10 have keyways 12
a, 10b are formed, and the cam member 10 is
It is fixed at 18 so that it cannot rotate. One side 10 of the cam member 10
c is formed so as to have a taper with a gradient θ in the radial direction.

In FIG. 2, reference numerals 20 and 22 denote washers and nuts, respectively. The nut 22 tightens the slide block 16 and the like to the extent that it does not rattle.

Next, the fixing operation will be described. First, the electrode body 4 is set at a predetermined position of the apparatus body 2, and then the fixing member 6 is slid and attached to the apparatus body 2. The electrode body 4 and the fixing member 6 can be positioned with respect to each other by a key 24. When the bolt 12 is rotated to the left or right with the contact surface 16c of the slide block 16 in contact with the electrode body 4, the upper surface of the fixed member 6 is centered by the displacement of the tapered surface of the cam member 10 which rotates at the same time. As a result, the fixed main body 8 is expanded in the sliding direction. By this expansion deformation,
The slide surfaces of the slide blocks 14 and 16 are crimped to the device body 2, and the fixed body portion 8 is locked to the device body 2. At the same time, the electrode body 4 is pressed by the contact surface 16c of the slide lock 16 and held by the apparatus body 2.

Further, when the bolt 12 is rotated in the opposite direction to that when the bolt is fixed, the expansion deformation of the fixed main body portion 8 is returned to the original state, and the pressed and held state of the electrode main body portion 4 is released. Then, the electrode main body portion 4 can be replaced by sliding the fixing member 6 out of the apparatus main body 2 or moving the fixing member 6 by the amount by which the engagement by the key 24 is released.

Therefore, the electrode body 4 can be easily attached and detached by a simple operation, so that the efficiency of the electrode replacement work can be improved and the work safety can be improved.

The electrode body 4 can be firmly fixed to the device body 2 only by pressing and holding the fixing member 6.
By disposing the key 26 as in this example, it is possible to prevent the positional displacement between the fixing member 6 and the electrode main body portion 4 and further increase the fixing strength. Also, slide block 14
The protrusion 14c can also be installed as a spacer member that is a member separate from the slide block 14.

Further, in this example, the fixing form of the electrode body 4 as the lower mold is shown, but when the fixing member 6 is installed on the movable base to which the electrode body 4 is fixed, the electrode body 4 as the upper mold is formed. The same fixing form can also be applied to. When the fixing member 6 is installed in a fixed portion that does not move together with the electrode main body 4, the electrode main body 4 as the upper die may be fixed as shown in FIG. The same parts as those in the above embodiment are designated by the same reference numerals,
A duplicate description will be omitted.

The movable portion 2c of the device body 2 has a guide groove 2d having a T-shaped cross section.
Is formed, and the guide groove 2d is formed on the upper surface of the electrode body 4.
Corresponding to the above, a projecting edge portion 4c having a T-shaped cross section is formed so as to be slidably engaged. Further, the fixed portion 2e of the apparatus main body 2 is formed with a projecting edge portion 2f having a T-shaped cross section so that the fixed member 6 can be slid and engaged.

The fixing operation will be described. First, the electrode body 4 is slidably engaged with the movable portion 2c with the fixing member 6 removed from the apparatus body 2. For this reason, a guide groove 2g for passing the protruding edge 4c of the electrode body 4 is formed in the protruding edge 2f of the fixed portion 2e. After engaging the electrode body 4 with the fixing member 6
Slide to engage and turn bolt 12 to lock.
As the contact surface 16c of the slide block 16 and the side surface of the electrode body portion 4 rub against each other due to the vertical movement of the electrode body portion 4, the contact surface 16c of the fixing member 6 is fixed to the electrode body portion 4c.
It is locked so that it does not come into contact with lightly. That is, in this case, the fixing member 6 does not serve as a member for pressing and holding the electrode body 4, but serves as a stopper member for preventing the electrode body 4 from coming off or moving.

Also in this example, as in the above-described example, the efficiency of the electrode replacement work can be improved, and the safety can be improved.

[Effect of device]

According to this invention, it is possible to improve the efficiency of the electrode replacement work, improve the safety by simplifying the work, and reduce the work cost.

[Brief description of drawings]

FIG. 1 is a side view and a front view of a main part of a welding electrode fixing structure according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the fixing member shown in FIG. 1, and FIG. Partial side view, front view and main part rear view of the welding electrode fixing structure according to the example,
The figure is a diagram showing how the electrodes are installed in the apparatus body. 2 ... Device body, 4 ... Electrode body portion 6 ... Fixing member, 8 ... Fixed body portion 10 ... Cam member, 16c ... Contact surface

Front page continued (72) Inventor Hiroto Yoshida 1-8-19 Shiba, Minato-ku, Tokyo Shirayama Factory (72) Inventor Hiroaki Yoshino 1-8-19 Shiba, Shiba, Minato-ku, Tokyo Inside the mountain factory

Claims (1)

[Scope of utility model registration request] 1. A welding electrode fixing structure for fixing an electrode main body to an apparatus main body of an electric heating apparatus via a fixing member, wherein the fixing member is engageable with the apparatus main body and is fixed to the electrode main body. A fixed main body having an abutment surface, and a rotatable cam member for expanding the fixed main body and locking the fixed main body at an arbitrary position of the apparatus main body by the expansion. A fixing structure for a welding electrode, characterized in that the electrode body is held with the fixing member locked.