POS machine safety contact pressure test device and test method

A technology of safety contacts and POS machines, applied in the field of testing, can solve the problems of inability to accurately measure the critical pressure value of safety contacts triggering, affecting the preload and tolerance of silicone pads, etc.

Active Publication Date: 2017-08-04
上海汇尔通信息技术有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0003] However, the trigger critical pressure value of the safety contact of the POS machine is related to the design of the silicone pad. The compression of the silicone pad is the main factor that determines the trigger critical pressure value. However, in actual production, due to the manufacturing tolerance of the silicone pad, Therefore, after the whole POS machine is locked and paid, the trigger critical pressure value of the safety contact will be differe...
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Method used

A kind of POS machine safety contact pressure testing device provided by the present invention is to form cantilever beam by carrying out special shape cutting to circuit board, safety contact is arranged on the free end of cantilever beam, can effectively avoid When the POS machine is locked and paid, the deformation of other parts of the circuit board will affect the measured value of the strain gauge measurement point. When the cantilever beam and the circuit board are deformed, the strain gauge set on the fixed end will obtain the strain value and pass it through the processor. The pressure value of the safety contact of the POS machine is calculated, and the whole test process has nothing to do with the compression of the silicone pad, so that the pressure value of the safety contact can be accurately measured when the POS machine is locked.
As can be seen from the above description, the strain gauge is arranged in the middle position of the safety contact and the fixed end end, the sensitivity of the strain gauge can be improved, and then the strain value generated by the deformation of the joint between the cantilever beam and the circuit board can be accurately obtained , calculate the pressure value of the safety contact of the POS machine according to the strain value, and the pressure value at this time is the most accurate.
Can know by above-mentioned description, above-mentioned strain gage adopts wire connection, and the strain value that gathers is transmitted to processor (processor is the strain tester of peripheral hardware) by wire, can promote transmission efficiency and security stability, due to strain It belongs to the internal micro-deformation of the circuit board, and the wires of the strain gauge have little influence on it.
Described cantilever beam is a cantilever beam cut out from the original circuit board, the surrounding groove of cantilever beam is connected, and safety contact is arranged on the free end position of cantilever arm, greatly reduces other parts of circuit board to cantilever The effect of the beam can improve the accuracy of the measurement.
In summary, a kind of POS machine safety contact pressure testing device and test method provided by the present invention are to form a cantilever beam by carrying out special shape cutting to the circuit board, and the safety contact is arranged on the cantilever beam On the free end, it can effectively avoid the influence of the deformation of other parts of the circuit board on the measured value of ...
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Abstract

The invention relates to the field of test, in particular to a POS machine safety contact pressure test device and a test method. The shape of a circuit board is cut in a special way to form a cantilever beam, and the safety contact is arranged at the free end of the cantilever beam. The influence of deformation of other parts of the circuit board on the measurement value at a measurement position of a strain gauge under the condition that a POS machine is locked can be avoided. When the joint of the cantilever beam and the circuit board deforms, the strain gauge arranged at the fixed end acquires a strain value, and the pressure value of the safety contact of a POS machine is calculated by a processor. The whole test process has nothing to do with the amount of compression of a silica gel pad. Therefore, the pressure value of the safety contact can be measured accurately under the condition that a POS machine is locked.

Application Domain

Cash registersApparatus for force/torque/work measurement

Technology Topic

Strain gaugeX-machine +5

Image

  • POS machine safety contact pressure test device and test method
  • POS machine safety contact pressure test device and test method
  • POS machine safety contact pressure test device and test method

Examples

  • Experimental program(2)

Example Embodiment

[0041] Please refer to Figure 1-2 , The first embodiment of the present invention is:
[0042] The present invention provides a POS machine safety contact pressure test device, which includes a circuit board provided with safety contacts, the circuit board is provided with a cantilever beam, the cantilever beam includes a free end and a circuit The fixed end of the board connection, the safety contact is arranged on the free end, and the fixed end is provided with a strain gauge for obtaining the strain value generated by the deformation of the cantilever beam and the circuit board. The processor is used to calculate the pressure value of the safety contact of the POS machine according to the acquired strain value.
[0043] The cantilever beam is a cantilever beam cut from the original circuit board, the surrounding grooves of the cantilever beam are open, and the safety contacts are arranged on the free end of the cantilever beam, which greatly reduces the influence of other components of the circuit board on the cantilever beam , You can improve the accuracy of the measurement.
[0044] The circuit board is provided with through holes. The through hole is used to weaken the energy transmission of the deformation of other parts of the circuit board, thereby protecting the cantilever beam from being affected and improving the accuracy of measurement.
[0045] The through hole is located at the reverse extension of the cantilever beam, which can improve the isolation effect of the cantilever beam and block the energy transmission of deformation of other parts of the circuit board as much as possible.
[0046] Further, the above-mentioned through hole is a bar-shaped through hole, and the bar-shaped through hole is perpendicular to the extending direction of the cantilever beam. When the bar-shaped through hole is perpendicular to the extending direction of the cantilever beam, the energy transferred from the deformation of other parts of the circuit board will be transmitted along the vertical axis of the bar-shaped through hole, that is, in the direction perpendicular to the extending direction of the cantilever beam. It can block the energy transfer of the deformation of other parts of the circuit board to the greatest extent.
[0047] The cantilever beam is rectangular, and the cross-sectional length of the strip through hole is equal to the width of the cantilever beam. When the cross-sectional length of the bar-shaped through hole is equal to the width of the cantilever beam, the energy transmission of the deformation of other parts of the circuit board can be blocked to the greatest extent, and the circuit board space occupied by the through hole can be reduced.
[0048] A fixed interval is provided between the through hole and the fixed end of the cantilever beam. A fixed interval is provided between the through hole and the fixed end of the cantilever beam, which does not affect the fixing strength of the cantilever beam.
[0049] Such as figure 2 , The processor calculates the pressure value of the safety contact of the POS machine according to the acquired strain value. The specific calculation formula is as follows:
[0050]
[0051] Where F is the pressure value, L is the position where the force value is applied, x is the position where the strain is measured, W is the bending section coefficient, E is the elastic modulus, ε x Is the strain value at x. In the stage of elastic deformation, the stress and strain of the material become proportional (that is, in accordance with Hooke's law), and the proportional coefficient is called the elastic modulus.
[0052] When a certain pressure is applied to the safety contact, the cantilever beam produces a slight deformation. The bending strain of the cantilever beam can be measured by the strain gauge, and the applied pressure value is calculated according to the above-mentioned mechanical formula, and the pre-pressure value of the silicone pad can be obtained.

Example Embodiment

[0053] Please refer to Figure 1-2 , The second embodiment of the present invention is:
[0054] On the basis of the first embodiment, the corresponding strain gauge is further defined, specifically: the strain gauge is located in the middle position between the safety contact and the end of the fixed end. Setting the strain gauge in the middle position between the safety contact and the fixed end can improve the sensitivity of the strain gauge, and then accurately obtain the strain value generated by the deformation of the joint between the cantilever beam and the circuit board, and calculate the POS based on the strain value The pressure value of the safety contact of the machine, the pressure value at this time is the most accurate. The strain gauge is wiredly connected to the processor. The above-mentioned strain gauges are connected by wires, and the collected strain values ​​are transmitted to the processor (the processor is a peripheral strain tester) through wires, which can improve the transmission efficiency and safety and stability, because the strain is the internal micro deformation of the circuit board , The wire of the strain gauge hardly affects it.
[0055] In summary, the present invention provides a POS machine safety contact pressure test device and test method, which cut the circuit board into a special shape to form a cantilever beam, and set the safety contact on the free end of the cantilever beam It can effectively avoid the influence of the deformation of the other parts of the circuit board on the measured value of the strain gauge when the POS machine is locked. When the joint between the cantilever beam and the circuit board is deformed, the strain gauge set on the fixed end will get the strain value , And calculate the pressure value of the safety contact of the POS machine through the processor. The whole test process has nothing to do with the compression of the silicone pad, so that the pressure value of the safety contact can be accurately measured when the POS machine is locked.

PUM

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