CN200981128Y - Broken knife detecting system for printing breadboard digital control drilling machine tool - Google Patents
Broken knife detecting system for printing breadboard digital control drilling machine tool Download PDFInfo
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- CN200981128Y CN200981128Y CN 200620063132 CN200620063132U CN200981128Y CN 200981128 Y CN200981128 Y CN 200981128Y CN 200620063132 CN200620063132 CN 200620063132 CN 200620063132 U CN200620063132 U CN 200620063132U CN 200981128 Y CN200981128 Y CN 200981128Y
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- printed substrate
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- machine tool
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Abstract
The utility model discloses a printed circuit board numeral control drilling lathe knife broken detecting system, comprising a detecting circuit with two signal output terminals, wherein one terminal is electrically connected with a conductive layer of a printed circuit board of the stacked printed circuit board fixed on an operating platform, and the other terminal is electrically connected with a conductive layer of another printed circuit board or the lathe operating platform which are mutually insulated between connecting points respectively with the signal output terminals, the utility model does not need to change installation of a motor, ensuring stability and accuracy demand of lathe work, and simultaneously applicable to drilling lathes employing various low and high speed motors, and the signal employed by the system is the continuous current excitation signal without generating interference to other control systems of the lathe and making the lathe more stable and reliable.
Description
Technical field
The utility model relates to a kind of breaking checkout gear of printed substrate drilling machine.
Background technology
Printed substrate uses general at electronic technology field.In general need to bore installing hole thereon, so that various electronic devices and components to be installed.Along with the microminiaturization of device, also more and more higher to the machining accuracy of printed substrate, corresponding installing hole is also more and more littler, and its density also progressively improves.Process needs efficiently in order to adapt to printed substrate, generally all adopt drill bit at a high speed simultaneously multilayer printed circuit board to be holed simultaneously.Because drill bit 6 ' can rupture in high-speed machining process unavoidably, if there is not timely discovery will cause printed substrate to scrap.
The technology that is used to detect breaking at present mainly contains two kinds, and Photoelectric Detection and contact detect.Photoelectric Detection mainly adopts photoelectric technology, in drill bit 6 ' both sides the light R-T unit is installed respectively, and when drill bit 6 ' was intact, drill bit 6 ' stopped light path, otherwise just represents that when light path is communicated with drill bit 6 ' has ruptured.The shortcoming that this technology exists is the installation accuracy height, causes the equipment debugging complexity, also be difficult to the drill bit 6 ' that is applicable to that diameter is less, and breakdown rate is higher.
It is the breaking detection technique that developed recently gets up that contact detects, with reference to Fig. 1, the core of this technology is to connect high level and low level respectively on the workbench 1 ' of motor 7 ' shell and lathe, drill bit 6 ' begins to descend from initial position, signal of telecommunication of generation contacts up to the surface with ground floor printed substrate (printed substrate 2 ' all passes through shop bolt 4 ' and is electrically connected with the workbench 1 ' of lathe), bored a hole and risen decline then at drill bit 6 ', contact with the surface of ground floor printed substrate again and produce a signal of telecommunication again, so constantly repeat.When drill bit 6 ' decrease speed was definite value, the interval of the signal of telecommunication that obtains also was constant so.If the detected signal of telecommunication is elongated at interval, drill bit 6 ' fracture is described then.In order to realize above-mentioned technology, need will insulate between motor 7 ' and the platen 1 ', in general be outside motor 7 ', to put insulation sleeve 9 ' to be fixed on the board by clamping device 8 ' again.But such scheme also can only be applicable to slow-revving motor, because can conduct electricity between the rotor of this class motor and the stator.For the motor (more than 100,000 commentaries on classics) of high-speed machine tool, the bearing of main shaft all is an air-bearing, when main axis rotation, the rotor of main shaft suspends in air, insulate with motor housing, that is to say between main shaft stator and rotor it is an equivalent capacity, therefore could pass through this equivalence electric capacity in requisition for high-frequency signal source, drill bit 6 ' could produce corresponding signal when contacting with printed substrate 2 ', domestic had relevant patent document (ZL200420015113.0 is used for the contact broken cutter monitor of PCB drilling machine) that high-frequency signal is carried out the technology that breaking detects to disclose.But also there is shortcoming in this device: 1. in order to realize insulation, have to requiring to add insulation sleeve 9 ' on the motor housing of precision-fit, because the existence of insulation sleeve 9 ' greatly reduces long-term comprehensive stability of lathe and precision; 2. use high-frequency signal injection, detection, increased probability that machine tool control system disturbed and the low reliability of The whole control system.
Summary of the invention
The purpose of this utility model is to provide a kind of printed substrate numeric control drilling machine tool breaking detection system, install very simply, need not motor installed and change, guaranteed the stability and the required precision of lathe work, can be suitable for various low, motors at a high speed, and the precision high workload is reliable.
The utility model is to realize above-mentioned purpose like this:
Printed substrate numeric control drilling machine tool breaking detection system, it is characterized in that comprising testing circuit, two signal input parts of this circuit, the one end be fixed on workbench on the conductive layer of a bar printing wiring board in the stacked printed substrate be electrically connected, the other end is electrically connected with the conductive layer or the platen of another bar printing wiring board, and the part that links to each other with signal input part insulate each other respectively.
Described testing circuit comprises comparator, and positive source links to each other with the input in the same way of comparator through resistance, and this in-phase input end also is the signal input part of testing circuit; Be connected with resistance between the reverse input end of comparator and the ground wire, and ground wire is another signal input part of testing circuit, the output of comparator links to each other with microprocessor or computer.
The beneficial effects of the utility model are: system only needs two signal input parts are connected with printed substrate or platen respectively, irrelevant with spindle motor, therefore need not motor installed and change, guarantee the stability and the required precision of lathe work, also be applicable to simultaneously the drilling hole machine tool that adopts various low, high-speed electric expreess locomotives; Connect the appropriate section that signal input part is linked to each other when drill bit is each, will produce a pulse signal, detect the drill bit breaking whether occurs by the time interval of judging pulse signal, if the adjacent pulse sigtnal interval is elongated, breaking then, otherwise normally; The signal that native system adopts is the continuous current excitation signal, can not produce the other control system of lathe and disturb, and makes lathe more reliable and more stable.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified:
Fig. 1 is the existing breaking checkout gear structural representation that adopts high-frequency signal;
Fig. 2-the 1st, the structural representation of the utility model lathe part;
Fig. 2-the 2nd, the theory diagram of the utility model testing circuit part.
The specific embodiment
With reference to Fig. 2-1 and Fig. 2-2, the printed substrate numeric control drilling machine tool mainly comprises workbench 1, be fixed on printed substrate 2 on the workbench 1, be fixed on spindle motor 7 on the lathe etc. by clamping device 8.And this breaking detection system, comprise testing circuit, two signal input part A, B of this circuit, the conductive layer of the bar printing wiring board on one end A and the workbench 1 that is fixed on lathe in the stacked printed substrate 2 is electrically connected, other end B is electrically connected with the conductive layer or the workbench 1 of another bar printing wiring board, and the part that links to each other with signal input part A, B insulate each other respectively.Whole system only needs two signal input part A, B are connected with printed substrate or platen 1 respectively, irrelevant with spindle motor 7, therefore need not motor 7 installed and change, guarantee the stability and the required precision of lathe work, also be applicable to simultaneously the drilling hole machine tool that adopts various low, high-speed electric expreess locomotives; When drill bit 6 each appropriate sections that signal input part A, B are linked to each other that connect, will produce a pulse signal, detect drill bit 6 breakings whether occur by the time interval of judging pulse signal; If the adjacent pulse sigtnal interval is elongated, breaking then, otherwise normal.And the signal that native system adopts is the continuous current excitation signal, can not produce the other control system of lathe and disturb, and make lathe more reliable and more stable.
Circuit theory diagrams below in conjunction with testing circuit are further described.Described testing circuit comprises comparator U1, and positive source V+ links to each other with the input in the same way of comparator U1 through resistance R 3, and this in-phase input end also is the signal input part A of testing circuit; Be connected with resistance R 2 between the reverse input end of comparator U1 and the ground wire GND, and ground wire GND is another signal input part B of testing circuit, the output of comparator U1 is connected with single-chip microcomputer U2; Single-chip microcomputer U2 has output port, and linking number weighted-voltage D/A converter U3, amplifier U4, resistance R 1 back link to each other with the inverting input of comparator U1 successively.Single-chip microcomputer U2 also has output port to link to each other with level translator U5, and level translator U5 output links to each other with microprocessor or computer, is used to solve output level and microprocessor or the unmatched problem of computer incoming level of single-chip microcomputer U2.
Stacked printed substrate 2 is provided with the locating hole 3 that runs through, having pin 4 to pass locating hole 3 fixedlys connected with platen 1, conductive layer on the printed substrate can both be electrically connected with platen 1 like this, when workbench 1 was connected with one of them signal input part B, corresponding conductive layer also linked to each other with this signal input part B.And insulate mutually for conductive layer and other printed substrates that makes the printed substrate that links to each other with another signal input part A, the locating hole 3 of the printed substrate that links to each other with testing circuit signal input part A is taper, and the conductive layer and the adjacent conductive interlayer of this printed substrate and pin 4 insulation are provided with insulating barrier 5.Because the locating hole 3 of the printed substrate that links to each other with testing circuit signal input part A is taper, then conductive layer on the printed substrate of the end that perforate is bigger and pin 4 insulation.The insulating barrier 5 general materials that adopt are that electric non-conductor gets final product, and all can as cardboard, plastic plate or the like.
The operation principle of this breaking detection system is: when the drill bit 6 of lathe moves downward and touches printed substrate 2, because drill bit 6 also is an electric conductor, keep identical current potential with the printed substrate of contact, along with drill bit 6 continues to move downward and during with the conductive layer contact of the printed substrate that is connected signal input part A, be equivalent to two signal input part A and B short circuit mutually.Because the incoming level of the in-phase input end of comparator U1 is higher than the incoming level of reverse input end in the testing circuit, then comparator U1 exports high level, but as two signal input part A and B mutually during short circuit, in-phase input end links to each other with ground wire GND, its level is lower than the incoming level of reverse input end, comparator U1 upset output low level then, finish this hole until drill bit 6, then drill bit 6 promotes, until with the conductive layers apart of the printed substrate that is connected signal input part A the time, in-phase input end transfers high level again to, the comparator U1 output high level that overturns once more.Because the decrease speed of drill bit 6 is constant and remain intact; change-over period between the high-low level of comparator U1 input also is a steady state value; if drill bit 6 is in case rupture; then the change-over period will change; microprocessor or computer will be made and shut down being handled so, allow user's bit change 6 more in time.Certainly occurring breaking of rod head 6 in a boring does not influence lathe and continue to bore and to beat other holes, needs only and more still can resume work behind the bit change 6.When if drill bit 6 breaking portions just in time break short circuit with the signal input, the input in the same way of comparator U1 just keeps the electronegative potential system that makes not work always, but because itself also there is certain resistance value in drill bit 6, therefore as long as adjust the level value of the reverse input end of comparator U1 system is resumed work, this moment single-chip microcomputer U2 the output output level, this level reverse incoming level to comparator U1 after weighted-voltage D/A converter U3, amplifier U4, resistance R 1 is adjusted, till comparator U1 output low level, lathe works on.
Claims (4)
1. printed substrate numeric control drilling machine tool breaking detection system, it is characterized in that comprising testing circuit, two signal input parts (A, B) of this circuit, one end (A) is electrically connected with the conductive layer that the workbench that is fixed on lathe (1) is gone up the bar printing wiring board in the stacked printed substrate (2), the other end (B) is electrically connected with the conductive layer or the workbench (1) of another bar printing wiring board, and the part that links to each other with signal input part (A, B) insulate each other respectively.
2. printed substrate numeric control drilling machine tool breaking detection system according to claim 1, it is characterized in that described testing circuit comprises comparator (U1), positive source (V+) links to each other through the input in the same way of resistance (R3) with comparator (U1), and this in-phase input end also is the signal input part (A) of testing circuit; Be connected with resistance (R2) between the reverse input end of comparator (U1) and the ground wire (GND), and ground wire (GND) is another signal input part (B) of testing circuit, the output of comparator (U1) links to each other with microprocessor or computer.
3. printed substrate numeric control drilling machine tool breaking detection system according to claim 2 is characterized in that the output of comparator (U1) is connected with single-chip microcomputer (U2); Single-chip microcomputer (U2) has output port, and linking number weighted-voltage D/A converter (U3), amplifier (U4), resistance (R1) back link to each other with the inverting input of comparator (U1) successively; Single-chip microcomputer (U2) also has output port to link to each other with level translator (U5), and level translator (U5) output links to each other with microprocessor or computer.
4. printed substrate numeric control drilling machine tool breaking detection system according to claim 1, it is characterized in that stacked printed substrate (2) is provided with the locating hole (3) that runs through, having pin (4) to pass locating hole (3) fixedlys connected with platen (1), and the locating hole (3) of the printed substrate that links to each other with testing circuit signal input part (A) is taper, and the conductive layer and the adjacent conductive interlayer of this printed substrate and pin (4) insulation are provided with insulating barrier (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620063132 CN200981128Y (en) | 2006-08-14 | 2006-08-14 | Broken knife detecting system for printing breadboard digital control drilling machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620063132 CN200981128Y (en) | 2006-08-14 | 2006-08-14 | Broken knife detecting system for printing breadboard digital control drilling machine tool |
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| Publication Number | Publication Date |
|---|---|
| CN200981128Y true CN200981128Y (en) | 2007-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620063132 Expired - Fee Related CN200981128Y (en) | 2006-08-14 | 2006-08-14 | Broken knife detecting system for printing breadboard digital control drilling machine tool |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264530B (en) * | 2008-04-25 | 2011-06-01 | 杨美英 | Contact type broken pin testing system of numerically-controlled PCB hole drilling machine tool |
| CN104786265A (en) * | 2015-04-23 | 2015-07-22 | 惠州市大亚湾天马电子机械有限公司 | Inductive microcurrent cutter breaking detection circuit |
| CN105436540A (en) * | 2014-09-30 | 2016-03-30 | 无锡利博科技有限公司 | Safety drilling device |
| CN107414211A (en) * | 2016-04-20 | 2017-12-01 | 先技精工(日本)有限公司 | Screw tap fractures detection method, multiaxis tapping processing unit (plant) and its axle unit used |
| CN109002009A (en) * | 2018-09-28 | 2018-12-14 | 深圳市山龙智控有限公司 | The automatic break detection device of drill hole processing center and detection method |
| CN109129017A (en) * | 2018-10-22 | 2019-01-04 | 深圳大学 | A kind of breaking monitor station of numerically-controlled machine tool |
| CN110695467A (en) * | 2019-11-12 | 2020-01-17 | 浙江建设职业技术学院 | Broken tap detection device for machining |
-
2006
- 2006-08-14 CN CN 200620063132 patent/CN200981128Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264530B (en) * | 2008-04-25 | 2011-06-01 | 杨美英 | Contact type broken pin testing system of numerically-controlled PCB hole drilling machine tool |
| CN105436540A (en) * | 2014-09-30 | 2016-03-30 | 无锡利博科技有限公司 | Safety drilling device |
| CN104786265A (en) * | 2015-04-23 | 2015-07-22 | 惠州市大亚湾天马电子机械有限公司 | Inductive microcurrent cutter breaking detection circuit |
| CN107414211A (en) * | 2016-04-20 | 2017-12-01 | 先技精工(日本)有限公司 | Screw tap fractures detection method, multiaxis tapping processing unit (plant) and its axle unit used |
| CN109002009A (en) * | 2018-09-28 | 2018-12-14 | 深圳市山龙智控有限公司 | The automatic break detection device of drill hole processing center and detection method |
| CN109129017A (en) * | 2018-10-22 | 2019-01-04 | 深圳大学 | A kind of breaking monitor station of numerically-controlled machine tool |
| CN110695467A (en) * | 2019-11-12 | 2020-01-17 | 浙江建设职业技术学院 | Broken tap detection device for machining |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071128 Termination date: 20140814 |
|
| EXPY | Termination of patent right or utility model |