DE2901253A1 - ELECTRONIC SYSTEM TEST DEVICE FOR CONTACTLESS MEASUREMENT OF MECHANICAL VIBRATIONS IN THE INFRASONAL AND ULTRASONIC AREAS - Google Patents

Description

Electronic system test device for contactless measurement

of mechanical vibrations in the infrared and ultrasonic range.

The invention relates to a contactlessly connectable system test device, the vibration frequency of mechanical parts (tools) in the infrared and ultrasonic range records and displays.

Ultrasonic welding technology is a particular area of application into consideration.

This results in the use of ultrasonic welding machines following problems: A US welding machine essentially consists of the generator, which generates the ultrasonic frequency, and the mechanical oscillator system from: the converter, which converts the electrical high-frequency vibrations into converts mechanical vibrations, the booster that converts these mechanical vibrations amplitude amplified or weakened, as well as.

the sonotrode (welding tool) directly attached to one of the to be connected Parts (plastic or metal) coupled.

This ensures that all o.e. Components as an oscillating circuit coupled to vibrate in resonance, it is necessary that all components are optimel are matched in terms of frequency.

This requires an appropriate design as well as good coupling of mechanical parts.

It happens n @ n that with a corresponding load of the mechanical Parts (e.g. when welding in production) cracks develop in them, which the operator cannot externally recognize or that the same when setting up the welding machine or when exchanging are not mechanically connected well enough.

So far there is no test device with which one can contact without effort (e.g. intervention in the welding machine) such malfunctions definitely also during the Can record production or take measurements when the machine is started up while the machine is idling (if a @ weld metal is not coupled).

Up to now, the individual components were known in such a case trust each other and examine individually. In such a case, only the sonotrode could and the booster are tested individually, but not the converter and the interaction of the parts as a whole.

This type of testing of the parts is time-consuming as the vibration system has to be dismantled necessary is. In addition, it is with some frequency testers, so-called @ornchecker (Horn = sonotrode) required that the parts to be tested must be screwed to a measuring head are.

This results in the task o.e. To avoid defects.

This is solved as follows: The invention essentially consists from the piezoceramic vibration sensor and the electronic evaluator. The vibration sensor can be contactless at a freely selectable distance (only depending on the measured variable) attached or held to the test specimen (oscillator system) will.

The advantage is that measurements can be taken immediately without dismantling the oscillator system can be carried out, i.e. no more intervention in the welding system is necessary; therefore suitable for every type of sound power system.

It is a quick check of @ehrerer @ chweißveräter with the device according to the invention possible.

The device is much cheaper than the bi @@@@ vor @ andenen Test equipment.

In addition, you can make a target / actual comparison of the working frequencies and thus continuous monitoring of the entire welding system (other sound systems of course also), i.e.

You enter the desired target working frequency range, the device constantly checks and gives a signal when the actual frequency value falls below the set Target working frequency range deviates. This signal can then be amplified and serve as a switch-off signal for the welding system. (Target / actual comparison with control Additionally)

Claims (9)

Patent claims 1. Electronic system testing device is characterized by that contactless frequency measurements in the infrared and ultrasonic range are possible. 2. Electronic system tester according to claim 1, characterized in that that measurements are carried out by means of structure-borne noise (touching the object to be measured) can be. 3. Electronic system tester according to claim 1, characterized in that that inductive, capacitive as well as piezo-electric signal transducers are used can. 4. Electronic system tester according to claim 1, characterized in that that this can be used for all power ranges from 1 watt upwards. 5. Electronic system tester according to claim 1, characterized in that that the measured value can be saved. 6. Electronic system tester according to claim 1, characterized in that that the measured value can be saved and the storage time can be verified. 7. Electronic system tester according to claim 1, characterized in that that a nominal frequency value can be entered. 8. Electronic system tester according to claim 1, characterized in that that a nominal frequency value can be entered and the same with the measured actual value is compared. 9. Electronic system tester according to claim 1, characterized in that that a nominal frequency value can be entered and the same with the measured one The actual value is compared and can be activated as a signal transmitter.