CN107014534B - POS machine safety contact pressure testing device and testing method - Google Patents
POS machine safety contact pressure testing device and testing method Download PDFInfo
- Publication number
- CN107014534B CN107014534B CN201710260889.0A CN201710260889A CN107014534B CN 107014534 B CN107014534 B CN 107014534B CN 201710260889 A CN201710260889 A CN 201710260889A CN 107014534 B CN107014534 B CN 107014534B
- Authority
- CN
- China
- Prior art keywords
- safety contact
- cantilever beam
- circuit board
- pos machine
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000741 silica gel Substances 0.000 abstract description 11
- 229910002027 silica gel Inorganic materials 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 239000011888 foil Substances 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
- G07G1/00—Cash registers
- G07G1/0018—Constructional details, e.g. of drawer, printing means, input means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
the invention relates to the field of testing, in particular to a device and a method for testing the pressure of a safety contact of a point-of-sale (POS) machine. Through carrying out special shape cutting to the circuit board, form the cantilever beam, set up safety contact on the free end of cantilever beam, can effectively avoid the influence to foil gage measurement department measuring value because of other partial deformations of circuit board when POS machine locking, when the cantilever beam takes place deformation with the circuit board junction, the foil gage of setting on the stiff end can acquire the strain value, and calculate the pressure value that obtains POS machine safety contact through the treater, whole test process is irrelevant with the compression of silica gel pad, thereby can be when POS machine locking the pressure value of accurate measurement safety contact.
Description
Technical Field
The invention relates to the field of testing, in particular to a device and a method for testing the pressure of a safety contact of a point-of-sale (POS) machine.
background
Generally all can be equipped with one or more than one safety contact on the PCB board in the POS machine, carry out the certain pressure value of pre-compaction through the silica gel pad, it is not hard up (generally tear quick-witted or the machine collision will take place) to work as the safety contact, and the pressure value of this moment is called and triggers critical pressure value, will trigger the POS machine at this moment and carry out safe mode, and the accessible removes the mode of internal information, prevents that internal information from revealing.
however, the triggering critical pressure value of the safety contact of the current POS machine is related to the design of the silica gel pad, wherein the compression amount of the silica gel pad is a main factor determining the size of the triggering critical pressure value, but in actual production, because the manufacturing of the silica gel pad has a tolerance, after the POS machine is locked, the triggering critical pressure value of the safety contact will be different from the nominal value of the safety contact during the design.
However, in the existing method for testing the pressure of the safety contact of the POS machine, direct measurement is performed through the pressure sensor, but since the pressure sensor has a certain thickness, the pre-pressure of the silica gel pad is greatly affected, and thus the triggering critical pressure value of the safety contact after the POS machine is locked cannot be accurately measured.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided are a testing device and a testing method capable of accurately testing the pressure value of a safety contact of a POS machine.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a POS machine safety contact pressure test device, includes the circuit board, be equipped with the safety contact on the circuit board, be equipped with the cantilever beam on the circuit board, the cantilever beam includes free end and the stiff end of being connected with the circuit board, the safety contact sets up on the free end, be equipped with the foil gage that is used for acquireing cantilever beam and circuit board junction and takes place the produced strain value of deformation on the stiff end, the foil gage is connected with the treater, the treater is used for calculating the pressure value that obtains POS machine safety contact according to the strain value that acquires.
The invention adopts another technical scheme that:
A POS machine safety contact pressure testing method comprises the following steps:
Acquiring a strain value generated by deformation of a joint of a cantilever beam and a circuit board, wherein the cantilever beam comprises a free end and a fixed end connected with the circuit board, and the safety contact is arranged on the free end;
And calculating to obtain the pressure value of the safety contact of the POS machine according to the obtained strain value.
The invention has the beneficial effects that: the invention provides a POS machine safety contact pressure testing device and a method, wherein a circuit board is cut into a special shape to form a cantilever beam, a safety contact is arranged at the free end of the cantilever beam, the influence of the deformation of other parts of the circuit board on the measurement value of a strain gauge when a POS machine is locked can be effectively avoided, when the deformation occurs at the joint of the cantilever beam and the circuit board, the strain gauge arranged on the fixed end can acquire a strain value, the pressure value of the POS machine safety contact is obtained through calculation of a processor, the whole testing process is irrelevant to the compression amount of a silica gel pad, and therefore, the pressure value of the safety contact can be accurately measured when the POS machine is locked.
Drawings
FIG. 1 is a schematic diagram of a POS machine safety contact pressure testing device according to the present invention;
FIG. 2 is a schematic diagram of a cantilever beam stress of a POS machine safety contact pressure testing apparatus according to the present invention;
FIG. 3 is a flow chart illustrating the steps of a method for testing the pressure of a safety contact of a POS machine according to the present invention;
description of reference numerals:
1. A circuit board; 11. a cantilever beam; 111. a free end; 112. a fixed end; 12. and a through hole.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
the most key concept of the invention is as follows: the safety contact is arranged at the free end of the cantilever beam, when the joint of the cantilever beam and the circuit board deforms, a strain value is obtained, and the pressure value of the safety contact of the POS machine is obtained through calculation according to the strain value.
Referring to fig. 1 and 2, the POS machine safety contact pressure testing apparatus provided by the invention includes a circuit board 1, a safety contact is arranged on the circuit board 1, a cantilever beam 11 is arranged on the circuit board 1, the cantilever beam includes a free end 111 and a fixed end 112 connected with the circuit board, the safety contact is arranged on the free end 111, a strain gauge for acquiring a strain value generated by deformation of a connection portion between the cantilever beam and the circuit board is arranged on the fixed end 112, the strain gauge is connected with a processor, and the processor is used for calculating a pressure value of the POS machine safety contact according to the acquired strain value.
From the above description, the beneficial effects of the present invention are:
the invention provides a POS machine safety contact pressure testing device, which is characterized in that a circuit board is cut into a special shape to form a cantilever beam, a safety contact is arranged at the free end of the cantilever beam, the influence of the deformation of other parts of the circuit board on the measured value of a strain gauge measuring position when a POS machine is locked can be effectively avoided, when the deformation occurs at the connecting position of the cantilever beam and the circuit board, the strain gauge arranged on the fixed end can acquire a strain value, the pressure value of the POS machine safety contact is obtained through calculation of a processor, the whole testing process is irrelevant to the compression amount of a silica gel pad, and therefore, the pressure value of the safety contact can be accurately measured when the POS machine is locked.
Further, a through hole 12 is formed in the circuit board.
According to the description, the through holes are formed in the circuit board and used for weakening energy transfer of deformation of other parts of the circuit board, so that the cantilever beam is protected from being influenced, and the measurement accuracy is improved.
Further, the through hole is located at the position of the cantilever beam extending in the opposite direction.
As can be seen from the above description, in another embodiment, the through hole is disposed at the position where the cantilever beam extends in the opposite direction, so that the isolation effect on the cantilever beam can be improved, and the energy transfer of the deformation of other parts of the circuit board can be blocked as much as possible.
furthermore, the through holes are strip-shaped through holes, and the strip-shaped through holes are perpendicular to the extending direction of the cantilever beam.
According to the above description, in the implementation process, when the strip-shaped through hole is perpendicular to the extending direction of the cantilever beam, the energy transferred by the deformation of other parts of the circuit board can be transferred along the vertical axial direction of the strip-shaped through hole, that is, the energy transferred by the deformation of other parts of the circuit board is transferred in the direction perpendicular to the extending direction of the cantilever beam, so that the energy transfer of the deformation of other parts of the circuit board can be blocked to the greatest extent.
Furthermore, the cantilever beam is rectangular, and the length of the section of the strip-shaped through hole is equal to the width of the cantilever beam.
From the above description, when the length of the cross section of the strip-shaped through hole is equal to the width of the cantilever beam, the energy transfer of the deformation of other parts of the circuit board can be blocked to the greatest extent, and the space of the circuit board occupied by the through hole can be reduced.
Furthermore, a fixed interval is arranged between the through hole and the fixed end of the cantilever beam.
As can be seen from the above description, the fixed interval is arranged between the through hole and the fixed end of the cantilever beam, so that the fixed strength of the cantilever beam is not affected.
Further, the strain gauge is located at the middle position between the safety contact and the end of the fixed end.
According to the description, the strain gauge is arranged in the middle of the safe contact and the end part of the fixed end, the sensitivity of the strain gauge can be improved, the strain value generated by deformation of the joint of the cantilever beam and the circuit board can be accurately obtained, the pressure value of the safe contact of the POS machine is obtained through calculation according to the strain value, and the pressure value at the moment is the most accurate.
Further, the strain gauge is in wired connection with the processor.
it can be known from the above description that the strain gauge is connected by a wire, and the collected strain value is transmitted to a processor (the processor is an external strain tester) by a wire, so that the transmission efficiency and the safety and stability can be improved.
Referring to fig. 3, the invention further provides a method for testing the pressure of the safety contact of the POS machine, including:
acquiring a strain value generated by deformation of a joint of a cantilever beam and a circuit board, wherein the cantilever beam comprises a free end and a fixed end connected with the circuit board, and the safety contact is arranged on the free end;
And calculating to obtain the pressure value of the safety contact of the POS machine according to the obtained strain value.
From the above description, the beneficial effects of the present invention are: the invention provides a POS machine safety contact pressure testing method, which is characterized in that a circuit board is cut into a special shape to form a cantilever beam, a safety contact is arranged at the free end of the cantilever beam, the influence of the deformation of other parts of the circuit board on the measured value of a strain gauge measuring position when a POS machine is locked can be effectively avoided, when the deformation occurs at the connecting position of the cantilever beam and the circuit board, the strain gauge arranged on the fixed end can acquire a strain value, the pressure value of the POS machine safety contact is obtained through calculation of a processor, the whole testing process is irrelevant to the compression amount of a silica gel pad, and therefore, the pressure value of the safety contact can be accurately measured when the POS machine is locked.
Referring to fig. 1-2, a first embodiment of the present invention is:
the invention provides a pressure testing device for a safety contact of a POS machine, which comprises a circuit board, wherein the circuit board is provided with a safety contact, the circuit board is provided with a cantilever beam, the cantilever beam comprises a free end and a fixed end connected with the circuit board, the safety contact is arranged on the free end, the fixed end is provided with a strain gauge for acquiring a strain value generated by deformation of the joint of the cantilever beam and the circuit board, the strain gauge is connected with a processor, and the processor is used for calculating the pressure value of the safety contact of the POS machine according to the acquired strain value.
The cantilever beam is a cantilever beam cut from an original circuit board, the peripheral groove of the cantilever beam is communicated, the safety contact is arranged at the free end position of the cantilever beam arm, the influence of other parts of the circuit board on the cantilever beam is greatly reduced, and the measuring accuracy can be improved.
The circuit board is provided with a through hole. The through hole is used for weakening energy transfer of deformation of other parts of the circuit board, so that the cantilever beam is protected from being influenced, and the measuring accuracy is improved.
The through hole is located at the reverse extending position of the cantilever beam, so that the isolation effect on the cantilever beam can be improved, and the energy transfer of deformation of other parts of the circuit board can be blocked as far as possible.
Further, the through holes are strip-shaped through holes, and the strip-shaped through holes are perpendicular to the extending direction of the cantilever beam. When the strip-shaped through hole is vertical to the extending direction of the cantilever beam, the energy transferred by the deformation of other parts of the circuit board can be transferred along the vertical axial direction of the strip-shaped through hole, namely the energy is transferred along the direction vertical to the extending direction of the cantilever beam, so that the energy transferred by the deformation of other parts of the circuit board can be blocked to the greatest extent.
The cantilever beam is rectangular, and the length of the section of the strip-shaped through hole is equal to the width of the cantilever beam. When the section length of the strip-shaped through hole is equal to the width of the cantilever beam, the space of the circuit board occupied by the through hole can be reduced while the energy transfer of the deformation of other parts of the circuit board is blocked to the greatest extent.
And a fixed interval is arranged between the through hole and the fixed end of the cantilever beam. And a fixed interval is arranged between the through hole and the fixed end of the cantilever beam, so that the fixed strength of the cantilever beam is not influenced.
as shown in fig. 2, the processor calculates the pressure value of the POS safety contact according to the obtained strain value, and the specific calculation formula is as follows:
wherein F is the pressure value, L is the position of the applied force value, x is the position of the strain measurement, W is the bending resistance section coefficient, E is the elastic modulus, εxIs the strain value at x. In the elastic deformation stage of the material, the stress and the strain are in a proportional relation (namely, the material conforms to Hooke's law), and the proportionality coefficient of the material is called elastic modulus.
when a certain pressure is applied to the safety contact, the cantilever beam generates micro deformation, the bending strain of the cantilever beam can be measured through the strain gauge, and the applied pressure value is calculated according to the mechanical formula, so that the pre-pressure value of the silica gel pad can be obtained.
Referring to fig. 1-2, a second embodiment of the present invention is:
On the basis of the first embodiment, the strain gauge is further defined as follows: the strain gauge is located in the middle of the safety contact and the end of the fixed end. The strain gauge is arranged at the middle position of the safe contact and the end part of the fixed end, the sensitivity of the strain gauge can be improved, the strain value generated by deformation of the joint of the cantilever beam and the circuit board can be accurately obtained, the pressure value of the safe contact of the POS machine is obtained through calculation according to the strain value, and the pressure value at the moment is the most accurate. The strain gauge is in wired connection with the processor. The strain gauge is connected by adopting a wire, the collected strain value is transmitted to the processor (the processor is a strain tester of the peripheral equipment) by a wire, the transmission efficiency and the safety and stability can be improved, and the strain gauge hardly influences the strain value because the strain belongs to the internal micro-deformation of the circuit board.
In summary, according to the POS machine safety contact pressure testing device and the testing method provided by the invention, the circuit board is cut into a special shape to form the cantilever beam, the safety contact is arranged at the free end of the cantilever beam, so that the influence of the deformation of other parts of the circuit board on the measurement value of the strain gauge when the POS machine is locked can be effectively avoided, when the connection part of the cantilever beam and the circuit board is deformed, the strain gauge arranged on the fixed end can acquire the strain value, the pressure value of the POS machine safety contact is obtained through calculation of the processor, the whole testing process is irrelevant to the compression amount of the silica gel pad, and thus the pressure value of the safety contact can be accurately measured when the POS machine is locked.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (7)
1. A POS machine safety contact pressure testing device comprises a circuit board, wherein a safety contact is arranged on the circuit board, and the POS machine safety contact pressure testing device is characterized in that a cantilever beam is arranged on the circuit board and comprises a free end and a fixed end connected with the circuit board, the safety contact is arranged on the free end, a strain gauge used for acquiring a strain value generated by deformation of the joint of the cantilever beam and the circuit board is arranged on the fixed end, the strain gauge is connected with a processor, and the processor is used for calculating a pressure value of the POS machine safety contact according to the acquired strain value;
The circuit board is provided with a through hole; the strain gauge is in wired connection with the processor.
2. The POS safety contact pressure testing apparatus of claim 1, wherein the through-hole is located at a reverse extension of the cantilever beam.
3. the POS machine safety contact pressure testing device according to claim 1, wherein the through hole is a strip-shaped through hole which is perpendicular to the extending direction of the cantilever beam.
4. The POS machine safety contact pressure testing device according to claim 3, wherein the cantilever beam is rectangular, and the length of the cross section of the strip-shaped through hole is equal to the width of the cantilever beam.
5. The POS machine safety contact pressure testing device according to claim 1, wherein a fixed interval is arranged between the through hole and the fixed end of the cantilever beam.
6. The POS machine safety contact pressure testing apparatus of claim 1, wherein the strain gauge is located intermediate the safety contact and the end of the fixed end.
7. A POS machine safety contact pressure testing method is characterized by comprising the following steps:
Acquiring a strain value generated by deformation of a joint of a cantilever beam and a circuit board, wherein the cantilever beam comprises a free end and a fixed end connected with the circuit board, and the safety contact is arranged on the free end;
And calculating to obtain the pressure value of the safety contact of the POS machine according to the obtained strain value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710260889.0A CN107014534B (en) | 2017-04-20 | 2017-04-20 | POS machine safety contact pressure testing device and testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710260889.0A CN107014534B (en) | 2017-04-20 | 2017-04-20 | POS machine safety contact pressure testing device and testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107014534A CN107014534A (en) | 2017-08-04 |
| CN107014534B true CN107014534B (en) | 2019-12-17 |
Family
ID=59448594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710260889.0A Expired - Fee Related CN107014534B (en) | 2017-04-20 | 2017-04-20 | POS machine safety contact pressure testing device and testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107014534B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001265520A (en) * | 2000-03-17 | 2001-09-28 | Fuji Electric Co Ltd | Input device of terminal |
| CN102548320B (en) * | 2011-12-30 | 2014-08-20 | 福建联迪商用设备有限公司 | Electronic device |
| CN105628268A (en) * | 2015-12-22 | 2016-06-01 | 福建联迪商用设备有限公司 | System and method of testing POS equipment safety contact pressure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001351172A (en) * | 2000-06-07 | 2001-12-21 | Matsushita Electric Ind Co Ltd | Cash drawing device |
| WO2015061986A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Signal connection apparatus |
-
2017
- 2017-04-20 CN CN201710260889.0A patent/CN107014534B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001265520A (en) * | 2000-03-17 | 2001-09-28 | Fuji Electric Co Ltd | Input device of terminal |
| CN102548320B (en) * | 2011-12-30 | 2014-08-20 | 福建联迪商用设备有限公司 | Electronic device |
| CN105628268A (en) * | 2015-12-22 | 2016-06-01 | 福建联迪商用设备有限公司 | System and method of testing POS equipment safety contact pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107014534A (en) | 2017-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105241371B (en) | Resistance strain gage | |
| CN103226006B (en) | Optical Fiber Grating Displacement Meter | |
| CN103148971B (en) | Method for testing local stress field of end part structure of thermal jacket of ultrahigh-pressure tubular reactor | |
| KR101179169B1 (en) | Temperature compensated load cell comprising strain gauges | |
| KR20140067650A (en) | Torque sensor | |
| CN113804119B (en) | High-temperature-resistant high-pressure optical fiber strain sensor | |
| CN107014534B (en) | POS machine safety contact pressure testing device and testing method | |
| RU2487328C1 (en) | Method to manufacture highly stable pressure sensor based on thin-film nano- and microelectromechanical system | |
| KR20170119283A (en) | A strain gauge and a pressure sensor comprising thereof | |
| US11346733B2 (en) | Measuring element, measuring system, and method of providing a measuring element for measurement forces | |
| CN107702990A (en) | A kind of sound emission extensometer and its test method | |
| CN208606915U (en) | A kind of measuring device of steel tube component twin shaft residual stress | |
| CN103162877A (en) | Method of testing bolt load | |
| CN100405033C (en) | Strain type force sensor for multiple components | |
| CN110823122A (en) | Bending curvature measuring device and method based on fiber bragg grating and elastic body | |
| CN101957168A (en) | Method for detecting deformation quantity of object through capacitance | |
| CN105091729B (en) | A kind of extend Strain Extensometer of bar of invar steel that adopts | |
| CN202433131U (en) | Device for inspecting load of bolt | |
| CN207487858U (en) | A kind of torsion sensor main body and torsion sensor | |
| CN103604537B (en) | Method for designing force measurement link in high-speed dynamic test | |
| CN209745222U (en) | Resistance strain type micro-strain sensor | |
| CN110631813A (en) | Load calibration method in undercarriage dynamic load test | |
| CN215338073U (en) | Length detection tool | |
| CN210802358U (en) | Strain extensometer | |
| CN110090877A (en) | A kind of Bending Mould online test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191217 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |