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Disconnected electrical contact fusion welding force detection device and method

A testing device and testing method technology, applied in the direction of measuring devices, force/torque/work measuring instruments, instruments, etc., can solve the problems of measurement accuracy, high cost, easy spring shaking, etc., to achieve high sensitivity, high stability, Sensitive effect

Active Publication Date: 2012-10-03
KUNMING GUIYAN JINFENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is necessary to investigate or study the various influencing factors of fusion welding, the method of using the tension meter is obviously unable to meet the requirements.
[0004] At present, there are several methods to detect the welding force, the simplest one is to use the tension spring stress gauge to move the movable contact after the contact is welded. Pull it apart, the maximum value of the strain gauge is the fusion welding force, this method cannot detect static fusion welding and incomplete fusion welding, and cannot do real-time detection
Another method is to install a piezoelectric chip at the lower end of the static contact, amplify the signal through the charge amplifier, and indicate the welding force through the peak voltage holding circuit. However, since the conversion relationship of the piezoelectric substrate is a nonlinear relationship, the measurement accuracy is affected. and higher cost
In addition, by installing a spring dynamometer on the movable contact end, when the spring pulls off the contact bridge, the dynamometer obtains the value of the welding force. Since the added spring is easy to shake, the movable contact and the static contact The alignment is not accurate, and the spring also has nonlinear problems to a certain extent

Method used

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  • Disconnected electrical contact fusion welding force detection device and method
  • Disconnected electrical contact fusion welding force detection device and method
  • Disconnected electrical contact fusion welding force detection device and method

Examples

Experimental program
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Embodiment 1

[0014] Embodiment 1 The sensor uses a 500cN force sensor, and a vibrator is used as the driving source. The maximum force of the vibrator is 10N, and the displacement range is 8mm. It is driven by a square wave with a duty cycle of 50%. The clamp is fixed at the end of the central shaft of the exciter, and the clamping contact is used as a moving contact. The static contacts are clamped using a welding force tester as described in the Summary of the Invention. The outer diameter of the reed and bracket of this device is 105mm, and the height of the bracket is 90mm. The output signal of the force sensor of the fusion welding force test device is connected to the peak value holder and the computer data acquisition system, and the peak value holder is reset before each breaking. After breaking, the computer reads the negative peak signal through the data acquisition system to calculate the fusion welding force. Weld force measurement range: +245cN to -245cN.

[0015] The contac...

Embodiment 2

[0017] Embodiment 2 A 2000g mechanical sensor is used as the sensor. A cylinder with a stroke of 15mm is used as the driving source, and a two-position five-way solenoid valve is used. The voltage of the solenoid valve coil is 12V, and compressed air is supplied. The contact fixture is fixed at the end of the cylinder, and the contact is clamped on the fixture as a moving contact. The contacts are clamped by means as previously described and act as stationary contacts. Adjust the relative position between the cylinder and the welding force testing device to obtain the stroke and closing pressure required for the experiment. When the solenoid valve is supplied with 12V voltage, the cylinder stretches out, the moving contact clicks on the static contact, and the contacts are closed; after the solenoid valve is powered off, the cylinder retracts, and the contacts are broken.

[0018] The dynamic and static contacts of the experimental materials are AgSnO2 / Cu composite contacts,...

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Abstract

The invention provides a disconnected electrical contact fusion welding force detection device, which is used for measuring the welding force of contact points and contacts used in relays, contactors, switches, and the like. The disconnected electrical contact fusion welding force detection device comprises a welding force measuring device and a force application mechanism (a vibration exciter, a linear motor and an air cylinder), and a fixture, wherein the welding force measuring device comprises a mechanical sensor, a reed, a support base, and a shell and can be mechanically set to zero. The disconnected electrical contact welding force detection device can accomplish the measurement on the welding force (including static welding and movable welding) of the contact points and the contacts by combining a data acquisition device and a rear instrument.

Description

technical field [0001] The invention relates to the field of electric contact of metal conductors, in particular to a measuring device and method for electric contact welding force. Background technique [0002] The state in which electric current can pass through mechanical contact between metal conductors is called electrical contact. Electrical contact is divided into several forms such as sliding contact, breaking contact, sliding breaking contact, and fixed contact. Among them, breaking contacts are the most widely used. Common switches, relays, contactors, starters, etc. all belong to this range. The material properties basically determine its breaking capacity and contact reliability. In the breaking contact, the materials of the two contact points are generally made of silver, copper, gold, platinum and other simple metals, alloys or composite materials, which undertake the task of connecting and disconnecting the circuit and the load. Heads, rivets, conductive she...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 马骏王毅肖周吴建昆
Owner KUNMING GUIYAN JINFENG TECH
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