SU747651A1 - Resistance spot welding apparatus - Google Patents

Description

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The invention relates to the field of resistance spot welding and can be used in multi-electrode machines with adjustment of the pitch between weld points in 5 wide limits.

Devices for resistance spot welding with a small pitch between points are known, used in multielectrode machines, which are a special welding gun that includes a large number of difficult to manufacture and dimensional parts, including a compression cylinder, which can be used 15 exclusively in this device 1.

The disadvantage of it is the bulkiness of the device; narrow application; design complexity; high labor consumption.

A device consisting of a cam with a cam washer mounted on the stem with the possibility of turning and a copy finger 25 rigidly connected with the cylinder (2) are known.

Its disadvantages are also the difficulty of making a copier and a cam washer, and the compactness of the device is insufficient. 30

The closest to the invention in its construction and principle is a device for resistance spot welding, which contains a compression drive for the electrodes and a mechanism for alternately placing the electrodes in a working position, made in the form of a hinged spring-loaded fixed switch on the compression drive cylinder. and pushers interacting with them 13.

The known device has the following disadvantages: the relative complexity of the design; the need for precision manufacturing to ensure reliable operation; insufficient compactness.

The aim of the invention is to reduce the size of the device, simplify its design and increase its reliability.

The goal is achieved by the fact that the switches are combined into one switch, which is made with two working surfaces, forming an acute angle between them, and are spring-loaded at a point lying on the bisector of this angle, and set relative to the cylinder body with the possibility of rotation by a certain angle.

FIG. 1 shows the proposed device, front view; in fig. 2 the same, side view; in fig. 3 - set the switch on the cylinder body.

The device contains a compression actuator in the form of a cylinder 1 with a rod 2, at the end of which an electrode holder 3 is installed with electrodes 4, the electrode contains a figured surface and is pivotally connected to the rod 2 by means of a fork 5. In a fork 5 between its supporting surface and figured the surface of the electric holder 31 is mounted for forward-forward movement relative to the axis of the cylinder, the pusher b. With the pusher 6, the switch 7 interacts, which is made with two working surfaces, forming an acute angle with the honey. The switch 7 is articulated with the possibility of two-sided limitation of movement and is connected with the cylinder body 1 and is spring-loaded relative to it at a point on the bisector of the angle formed by the working surfaces, the spring 8.

The operation of the device is as follows.

Kinematical links of the device In the figures, they are in the state that sets the initial working position for the left electrode 4. When the rod 2 is extended from the cylinder 1, the pusher 6 installed in its fork 5 and occupying the leftmost position will act on the working surface of the Switch 7, will turn at a certain angle and after leaving the zone of interaction with it, it makes it possible to occupy the previous position. The stability of this position on one side will be: provided by limiting the switch 7, with the other action of the spring 8. When the rod 2 returns to its initial position, the pusher 6, interacting with the working surface of the switch 7, will move to the right, making space for a protrusion on the shaped surface of the electric holder. 3 on the left and a similar protrusion on the right, "Thanks to this / electric holder, the electric holder 3 will turn in the plug 5 and now the working position will be stable, right electrode. At the same time, the pusher 6, after being displaced to the right from the axis of the hinge of the switch 7, will begin to turn it and, when the point of application of the force of the spring 8 moves to the left of the axis of the same hinge, the switch 7 will take the opposite stable position. Thankful. The guidance of the stroke in the opposite direction and the expansion action of the same spring 8. This state of the kinematic links of the device is the source for welding the next point.

Thus, this design is compact, up to fit into the diameter of the cylinder body, 5 contains a much smaller number of parts, increases their reliability, the clarity of interaction, i.e. increases the reliability of the device.

Claims (3)

Invention Formula Device for resistance spot welding, containing a compression drive 5 electrodes and the mechanism of their alternate installation in a working position, made in the form of a hinged spring-loaded switches and a pusher interacting with them, in order to reduce the size, simplify the design and increase reliability, the switches are combined into one the switch, which is made with two working surfaces, forming an acute angle between them, and is spring-loaded at the point lying on the bisector of this angle, and the relative cylinder body 0 with the ability to rotate at a certain angle. Sources of information taken into account in the examination with 1. USSR author's certificate according to W 2425208, cl. At 23 K 11/10, 1974. 2. Authors certificate of the USSR 516488, cl. At 23 K 11/10, 1974. 3. USSR author's certificate according to application B 2391617/27, cl. 23 K 14/10, 1976.