JPS6239900Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a seam welding machine, and particularly to a seam welding machine in which the height of an electrode ring is automatically adjusted.

Generally, in a seam welding machine, an upper electrode ring is provided on the upper side of the frame via a pressurizing cylinder, and a lower electrode ring is provided on the lower side of the frame via an electrode ring mount. This electrode wheel mount is vertically movable by a jack provided below the electrode wheel mount, making it possible to adjust the height of the lower electrode wheel. Therefore, in such a seam welding machine, when the lower electrode ring wears down to an almost certain amount, the operator operates the jack to raise the lower electrode ring so that the upper part of the lower electrode ring comes into contact with the lower surface of the workpiece. Adjusted to position.

However, when adjusting the height of the electrode wheel in this manner, it is difficult to grasp the amount of wear on the lower electrode wheel, and it is not possible to appropriately determine whether adjustment is necessary. Further, since such adjustment is performed visually by the operator, it is difficult to set an accurate amount of adjustment, and therefore, a large amount of time is required for this adjustment.

Furthermore, if the position of the lower electrode ring is incorrect, the object to be welded may be deformed by the pressure applied by the upper electrode ring, or power may not be properly supplied from the lower electrode ring, causing damage to the contact area with the lower electrode ring. This causes a problem in that abnormal heat generation occurs and welding quality deteriorates. Furthermore, this abnormal heat generation also causes the problem that the electrode tread of the lower electrode ring is damaged.

This invention was devised in view of the above-mentioned conventional problems, and it is an object of this invention to provide a seam welding machine that can automatically adjust the height of the electrode wheel to obtain sound welding quality.

In order to achieve the above object, the seam welding machine according to the invention has an electrode pressurizing system equipped with a pressurizing cylinder and an electrode ring that pressurizes and welds the workpiece, and is disposed on a frame so as to be movable in the vertical direction. An electrode pressurizing system is supported by the frame in a balanced state by an electrode pressurizing system support means, and the electrode pressurizing system pressurizes the object to be welded, thereby removing a reaction force from the object to be welded. The reaction force causes the weld to be set at an appropriate position relative to the workpiece.

This invention will be explained below with reference to the drawings.

FIG. 1 is a side view showing essential parts of an embodiment of the seam welding machine according to the invention.

On the side of frame 1 in the seam welding machine,
A cylindrical guide shaft 5 is fixed to the frame 1 so as to extend in the vertical direction through the mounting block 3. This guide shaft 5 is provided with an electrode pressurizing system 9 that pressurizes and welds the object to be welded 7 with the configuration described below.

That is, the sliding guide 15 is fixed to the subframe 11 via the subframe mounting plate 13,
The sliding guide 15 is fitted into the guide shaft 5 so as to be movable in the direction in which the guide shaft 5 extends. Further, an upper electrode pressurizing cylinder 17 is fixed to the upper part of the subframe 11, and an upper electrode ring 21 is provided at the tip of the piston of this cylinder 17 via a power supply part 19. Furthermore, an upper electrode pressurizing cylinder 17 is installed at the lower part of the subframe 11.
At a position facing the lower electrode pressurizing cylinder 23
is installed. This lower electrode pressure cylinder 2
Similarly to the upper electrode pressurizing cylinder 17, a lower electrode ring 27 is also provided at the tip of the piston portion of No. 3 via a power supply section 25. The object to be welded 7 can be interposed between the upper electrode ring 21 and the lower electrode ring 27.

On the other hand, at the lower end of the subframe mounting plate 13,
A cylindrical spring receiver 29 with a bottom is fixed with its cylindrical portion facing downward, and a coil spring 31 is disposed within this cylindrical portion. Further, a balance cylinder 33 is installed at a position opposite to the spring receiver 29 at the lower part of the frame 1 as an electrode pressurizing system support means. The tip of the piston of this balance cylinder 33 is in contact with the coil spring 31, and therefore the balance cylinder 33 is connected to the electrode pressurizing systems 9, 11, 13, 15, 17, 19, 21, 2 through the coil spring 31.
3, 25, and 27 can be supported.

FIG. 2 is a pneumatic circuit diagram of the cylinder in the same embodiment. The air pressure source 35 is connected via a solenoid valve 37 to an upper electrode pressurizing cylinder 17 and a lower electrode pressurizing cylinder 2 connected in parallel to this solenoid valve 37.
It is connected to 3. Furthermore, the air pressure source 35 is connected to the balance cylinder 33 via a pressure regulator 39 . Here, the pressure regulator 39
The pressure is adjusted so that the balance cylinder 33 supports the entire weight of the electrode pressurizing system 9 in a balanced state.

Next, the action will be explained.

When the seam welding machine is started, the electromagnetic valve 37 is excited, and the upper electrode pressurizing cylinder 17 and the lower electrode pressurizing cylinder 23 move in a direction to pressurize the workpiece 7. Due to this movement of both cylinders 17 and 23, both the upper electrode ring 21 and the lower electrode ring 27
Alternatively, either one of them comes into contact with the workpiece 7 to be welded.
Here, it is normal that either the upper electrode ring 21 or the lower electrode ring 27 contacts the workpiece 7 first, and the case where the upper electrode ring 21 contacts the workpiece 7 first will be described first.

When the upper electrode ring 21 comes into contact with the workpiece 7 , an upward reaction force from the workpiece 7 acts on the upper electrode ring 21 . Due to this reaction force, the balance between the force from the balance cylinder 33 and the weight of the electrode pressurizing system 9 is disrupted, and the electrode pressurizing system 9 is moved while the upper electrode ring 21 is in contact with the workpiece 7. move upwards. As the electrode pressurizing system 9 moves, the balance cylinder 33
The piston also moves upward in the same way.

Thereafter, when the lower electrode ring 27 comes into contact with the workpiece 7 , the reaction force that the lower electrode ring 27 receives from the workpiece 7 cancels out the reaction force that the upper electrode ring 21 receives, and the electrode pressurization system 9 The movement is stopped, and the upper electrode ring 21 and the lower electrode ring 27 are set at appropriate positions. In this state, appropriate pressing force is applied from both electrode wheels 21 and 27, power is supplied, and seam welding is performed.

Next, when the lower electrode ring 27 comes into contact with the workpiece 7 before the upper electrode ring 21, the opposite effect to the above case occurs.

As described above, according to the above embodiment, since the electrode pressurizing system 9 is supported by the frame 1 in a balanced state by the balance cylinder 33, the electrode pressurizing system 9 is not acted upon by the workpiece 7 when pressurizing. The upper and lower electrode wheels 21 and 27 can be set at appropriate positions by being moved by the reaction force generated by the electrode wheels 21 and 27. Therefore, the object to be welded 7
is not deformed because it is appropriately pressurized by both the upper and lower electrode rings 21 and 27. In addition, since the object to be welded 7 is appropriately pressurized, both electrode rings 21 and 27
The power supply becomes normal and it is possible to obtain healthy welding quality. Furthermore, since the power supply is normal, no damage is caused to the electrode treads.

Since the heights of the electrode wheels 21 and 27 are automatically adjusted, there is no need to adjust the heights of both the electrode wheels 21 and 27. Therefore, welding work can be performed continuously, increasing productivity. can be improved.

Furthermore, since the coil spring 31 is interposed between the electrode pressurizing system 9 and the balance cylinder 33, it is possible to buffer minute movements from the balance cylinder 33 and move the electrode pressurizing system 9 smoothly. can.

As described above, the seam welding machine according to the present invention includes a frame, an electrode pressurizing system that is disposed on the frame so as to be movable in the vertical direction, and includes a pressurizing cylinder and an electrode ring that pressurizes and welds the workpiece to be welded. , an electrode pressurizing system support means for supporting the electrode pressurizing system on the frame in a balanced state, so that the height of the electrode ring can be automatically adjusted to obtain sound welding quality. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing essential parts of an embodiment of a seam welding machine according to the invention, and FIG. 2 is a pneumatic circuit diagram of a cylinder in the same embodiment. DESCRIPTION OF SYMBOLS 1... Frame, 7... Welding object, 9... Electrode pressure system, 17... Upper electrode pressure cylinder, 21...
...Upper electrode ring, 23...Lower electrode pressure cylinder,
27...lower electrode ring, 33...balance cylinder.

Claims (1)

[Scope of utility model registration request] a frame, an electrode pressurizing system disposed on the frame so as to be movable in the vertical direction and comprising a pressurizing cylinder and an electrode ring for pressurizing and welding the workpiece, and the electrode pressurizing system being supported by the frame in a balanced state. A seam welding machine characterized by having an electrode pressurizing system support means.