CN1050098A - The control device of large tower clock and method - Google Patents
The control device of large tower clock and method Download PDFInfo
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- CN1050098A CN1050098A CN 90108093 CN90108093A CN1050098A CN 1050098 A CN1050098 A CN 1050098A CN 90108093 CN90108093 CN 90108093 CN 90108093 A CN90108093 A CN 90108093A CN 1050098 A CN1050098 A CN 1050098A
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Abstract
The present invention relates to a kind of computer control device and method of large tower clock.This device uses microcomputer CPU as main control unit U
1, adopt the compact high precision crystal clock as calibration clock U
11, also comprise pulse counter module U
2, I/O switching value module U
3, keyboard and display panel U
4, interface module U
5, level shifting circuit U
6, turret clock operation board U
7, driving device for step-by-step U
8, turret clock striking mechanism U
9With lighting device U
10This control system is controlled by software, pulse signal when producing away by Control Software, five phase step motor by each module controls turret clock of Control Software, when carry out, to the time, delay time, when chasing after, give the correct time, functions such as give the correct time red-letter day, illumination, replaced complicated control hardware, simple in structure, reliability is high, precision is high, effective.
Description
The present invention relates to the computer control device and the method for the control device and the method, particularly large tower clock of turret clock.
Up to the present, the control device of turret clock and method all adopt following dual mode: the one, adopt quartz vibrator master clock movement to produce sprocket pulse, through hardware circuit carry out signal amplification, frequency division, driving is unidirectional or three-phase stepper motor, when the control turret clock is walked; Give the correct time, function such as illumination then adopts mechanical switch, photovoltaic sensing element to realize.The hardware configuration complexity of this control mode, driving force is little, the cost height, when turret clock clock dial diameter was very big, this system just can't adapt to; The 2nd, adopt small-sized crystal clock as master clock, with optoelectronic induction element tracks master clock clock pin, when realizing walking of turret clock, adopt mechanical switch, alternating current sensing element to realize illumination, time reporting function by control direct current or alternating current generator.This mode is more progressive to some extent than first kind, but still exists complex structure, involves great expense, shortcomings such as poor reliability, failure rate height.
The purpose of this invention is to provide a kind of large tower clock that can adapt to simple in structure, reliable, that accuracy of timekeeping is high, driving force is big and control control device and the method that requires.
According to the present invention, adopt microcomputer to form simple control device as main control unit, when realizing walking of turret clock by Control Software, to the time, when chasing after, time-delay, finish simultaneously and give the correct time and illumination functions.Because software does not have faults such as mechanical wear, so the reliability height.
According to the present invention, adopt a compact high precision crystal clock as auxiliary calibrating installation, when guaranteeing that the turret clock high precision is walked.
According to the present invention, adopt software generation sprocket pulse and carry out five phase frequency divisions, to drive high-power five phase step motor, replace the complicated hardware frequency dividing circuit, thereby improved turret clock reliability of operation and driving force widely.
According to the present invention, micro computer can adopt cheap single-chip microcomputer, single card microcomputer, also can adopt the general industrial controller, replaces the complicated hardware structural circuit, and is therefore simple in structure, stable and reliable for performance, cost is low.
According to control device of the present invention, being interconnected by microcomputer CPU module, pulse counter module, I/O switching value module, keyboard and display panel, interface module, level shifting circuit, turret clock driving device for step-by-step, operation board, striking mechanism, lighting device and calibration clock forms.To calibrate clock, level shifting circuit, pulse counter module, microcomputer CPU module, I/O switching value module, interface module is connected in series in proper order, keyboard and display panel is received on the microcomputer CPU module, operation board and interface module are joined, interface module also links with pulse counter module, and is connecting turret clock drive unit, striking mechanism and lighting device respectively.
According to the present invention, the control procedure of tower clock control unit realizes by Control Software.Pulse signal when walking by software generation turret clock by microcomputer CPU, by software this signal is carried out five phase frequency divisions again, through I/O switching value module and interface circuit and stepper motor driver is the turret clock drive unit control step motor that links, and drives reducer casing, when driving turret clock clock pin is walked.
According to turret clock calibration steps of the present invention be, the sprocket pulse signal of calibration clock is drawn, through level shifting circuit, the pulse signal of 1.5V is converted to+pulse signal of 5V, pulse counter module receives this signal, record calibration clock sprocket pulse number hourly.When the counting module meter is completely calibrated the per hour sprocket pulse amount of clock, send one and output signal to the CPU module, after CPU receives this signal by I/O switching value module, during with actual walk of turret clock during the walking of pulsed quantity and calibration clock pulsed quantity compare, according to comparative result turret clock is calibrated, when guaranteeing that turret clock is accurately walked, meanwhile, the time of giving the correct time, lighting hours of regulation are compared during respectively with walking at that time the time, the satisfied condition of giving the correct time, start the turret clock striking mechanism by I/O switching value module and interface module and give the correct time; Satisfy lighting condition, start lighting device and throw light on.
Keyboard and display panel is used for to microcomputer CPU input necessary parameter and starts running software.
The turret clock operation board is used to control the various functions of turret clock, and microcomputer CPU realizes various control function by the various signal conditions of detecting operation dish.
According to the present invention, the control procedure of tower clock control unit realizes by Control Software, the present invention is designed to modular structure with Control Software, whole software is made of 9 program blocks, comprise the primary control program piece, forward to the time program block, reverse to the time program block, program block when normally walking, program block when forward check and correction chases after, program block, normal delay procedure piece, delay procedure piece when check and correction chases after when reverse check and correction chases after.
The function of primary control program piece is that I/O switching value module and pulse timing module are carried out initialization, then to these two module zero clearings, current integral point value is sent into the internal storage location of appointment with 16 system numbers, call in order to down-stream, then the status signal of being sent here by interface module and I/O switching value module by operation board is detected, judgement be to the time or normal time status.According to judged result enter respectively to the time program block or program block when normally walking.
To the time program block divide forward to the time program block and reverse to the time program block, be used for before the normal operation of turret clock time at that time to the time.This program block produces soft division function according to the phase sequence that stepper motor requires.The frequency of these program blocks by to the time when chasing after the delay procedure piece determined that the every operation one-period of stepper motor detects once the various modes of operation position of operation board, to determine next step duty, carries out function corresponding.
Program block produces soft division function according to the phase sequence of stepper motor when normally walking.Frequency is to be determined through strict calculating and test by normal delay procedure piece when walking.According to the present invention, frequency does not adopt 1Hz and adopts any frequency in 50～100Hz scope during normally the walking of turret clock, and this frequency delay procedure piece when normally walking produces, and turret clock is operated steadily, and reduces inertia.The every operation one-period of stepper motor all detects " per hour time to " state of being sent into by the I/O module by counting module, determines the trend of next step program.If do not receive " per hour the time arrives " mode bit, when then continuing to walk; If receive " per hour the time arrives " mode bit, then will be at that time the time give the correct time and lighting hours compares with predetermined, as time at that time at the appointed time, then carry out and give the correct time or illumination functions, program block when forwarding when forward check and correction chases after program block or reverse check and correction then to and chasing after; If at that time the time not at the appointed time, program block when program block or reverse check and correction chase after when then directly changing forward check and correction over to and chasing after.The check and correction of these two program blocks to the time time be by turret clock in the last time with this hour of time at that time in the sprocket pulse of being passed by count T
1With the sprocket pulse T that passes by by the calibration clock
2Compare and determine: if T
1＞T
2, when then being reverse school, if T
1=T
2, then return program block when normally walking; If T
1＜T
2, during then for school forward.When turret clock is walked and the calibration crystal clock keep absolute synchronization between when walking.Give the correct time and lighting hours can need select by actual conditions.
The program block that gives the correct time red-letter day was specifically designed to and realizes the time reporting function at zero point when the major holiday.
The delay procedure piece adopts twin-stage time-delay mode when normally walking, by calculating and test can produce frequency in 50～100Hz scope exactly and sends into program block when normally walking.The delay procedure piece adopted single-stage time-delay mode when check and correction chased after, by calculating arbitrary frequency that can produce in 1000～1500Hz scope.
Below in conjunction with accompanying drawing the present invention is elaborated.
Fig. 1 is the system principle diagram of a kind of embodiment of control device of the present invention.
Fig. 2 is primary control program piece V
1FB(flow block).
Fig. 3 be forward to the time program block V
2FB(flow block).
Fig. 4 be reverse to the time program block V
3FB(flow block).
Fig. 5 is program block V when normally walking
4FB(flow block).
Fig. 6 forward proofreads program block V when chasing after
5FB(flow block).
Fig. 7 is reverse check and correction program block V when chasing after
6FB(flow block).
Fig. 8 is the program block V that gives the correct time the major holiday
7FB(flow block).
Fig. 9 is normal delay procedure piece V
8FB(flow block).
Figure 10 proofreads delay procedure piece V when chasing after
9FB(flow block).
Large tower clock computer control device as shown in Figure 1 is by microcomputer host CPU module u
1, pulse counter module u
2, I/O switching value module u
3, keyboard and display panel u
4, interface circuit plate module u
5, level shifting circuit u
6, turret clock operation board u
7, driving device for step-by-step u
8, turret clock striking mechanism u
9, turret clock lighting device u
10With calibration clock u
11Form, promptly in turn with standard clock u
11, level shifting circuit u
6, pulse counter module u
2, host CPU module u
1, I/O switching value module u
3, interface circuit plate module u
5Be connected in series, again with pulse counter module u
2Be connected to interface circuit plate module u
5, with operation board display board u
4Be connected to microcomputer CPU module u
1On, interface circuit plate module u
5Also connecting turret clock drive unit u respectively
8, turret clock striking mechanism u
9With turret clock lighting device u
10
The host CPU module u here
1Can adopt single-chip microcomputer, for example the MCS-51 series monolithic; Also can adopt single card microcomputer, for example the TP801 single card microcomputer; Also can adopt the general industry controller, for example the TP805 Industrial Control Computer.When adopting single card microcomputer or single-chip microcomputer, should make corresponding pulse counter module u as main frame
2, I/O switching value module u
3, interface circuit plate module u
5Deng.Adopt Industrial Control Computer to make host CPU module u
1The time, then machine itself all has above-mentioned module, needn't make separately.
Calibration clock u
11Can adopt various types of compact high precision crystal clocks, the timekeeping performance of this crystal clock has determined the timekeeping performance of turret clock.
Keyboard and display panel u
4Be used to import necessary parameter and start running software.
Turret clock operation board u
7Be used to control the various functions of turret clock, host CPU module u
1By detecting operation dish u
7Various signal conditions realize various control function.
According to embodiment shown in Figure 1, the control procedure of this kind control device is achieved like this: host CPU module u
1Pulse signal when producing turret clock and walk by Control Software (seeing Appendix), and this signal carried out five phase frequency divisions, through I/O switching value module u
3With interface module u
5With turret clock driving device for step-by-step u
8, when control step driven by motor reducer casing driving turret clock is walked, function when realizing.
As shown in Figure 1, will calibrate clock u
11Walk the time pulse signal draw, through level shifting circuit u
6The pulse signal of 1.5V conversion of signals one-tenth+5V, send into pulse counter module u
2, write the umber of pulse of regulation all over after, to signal of host CPU output, after host CPU connects this signal, umber of pulse T during with actual walk of turret clock
1Umber of pulse T during with calibration the walking of clock
2Compare, according to comparative result, by I/O switching value module u
3With interface circuit plate module u
5, or start striking mechanism u
9Give the correct time, or start lighting device u
10Throw light on, or calibrate.
Fig. 2～Figure 10 is for realizing the Control Software FB(flow block) of control method of the present invention.
Control procedure of the present invention realizes with Control Software.The pulse signal carried out five phase frequency divisions by Control Software to stepper motor again, through I/O switching value module u when host CPU was walked by this Control Software generation turret clock
3With interface module u
5When the driving turret clock is walked.This Control Software is a modular organization, by primary control program piece V
1, forward to the time program block V
2, reverse to the time program block V
3, program block V when normally walking
4, check and correction program block V when chasing after forward
5, program block V when reverse check and correction chases after
6, the major holiday program block V that gives the correct time
7, normal delay procedure piece V
8, check and correction delay procedure piece V when chasing after
9Form.
As shown in Figure 2, primary control program piece V
1Function be to I/O switching value module u
3With pulse counter module u
2Carry out initialization, to these two module zero clearings, with at that time to the time the integral point value send into the internal storage location (2500H) of appointment with 16 system numbers, call in order to down-stream, then this program block detects turret clock work dish u repeatedly
7By interface circuit plate module u
5With I/O switching value module u
3The status signal of sending here, according to detected mode bit, change over to respectively forward to the time program block V
2, reverse to the time program block V
3Or program block V when normally walking
4If detected be forward to the time mode bit, just change over to forward to the time program block V
2, if not, detect again whether be reverse to the time mode bit, if, just change over to reverse to the time program block V
3, if not, whether detect mode bit when normally walking again, if just change program block V when normally walking over to
4, if not, enter next round and detect.
As shown in Figure 3, when program by primary control program piece V
1Change over to forward to the time program block V
2After, V
2Bring into operation.Forward to the time program block V
2Function be to produce soft frequency division according to the phase sequence that stepper requires, forward drive stepping motor fortune circles, then to turret clock operation board u
7Each mode bit detect once, according to testing result, respectively once more forward drive stepping motor fortune circle or change over to reverse to the time program block V
3Or change program block V when normally walking over to
4, or return primary control program piece V
1Trace routine.
As shown in Figure 4, when program by primary control program piece V
1Or forward to the time program block V
2Change over to reverse to the time program block V
3The time, this program block just brings into operation.Reverse to the time program block V
3Function be that phase sequence by the stepper motor requirement produces soft frequency division, reverse drive stepping motor fortune circles, then to turret clock operation board u
7Each mode bit detect once, circle according to the reverse once more respectively drive stepping motor fortune of testing result, or change over to forward to the time program block V
2, or change program block V when normally walking over to
4Or return host control block V
1Trace routine, promptly when detect reverse to the time during mode bit, return this program block and begin the place, reverse once more drive stepping motor fortune circles; When detected be forward to the time just turn to during mode bit forward to the time program block V
2; When detecting when normally walking mode bit, turn to program block V when normally walking
4, when these three kinds of mode bits all do not detect, just return primary control program piece V
1Trace routine.
As shown in Figure 5, when program by host control block V
1Or forward to the time each preface piece V
2Or reverse to the time program block V
3Change program block V when normally walking over to
4The time, just start program when normally walking.Program block V when normally walking
4Function be that a hour counted number of pulses is sent into pulse counter module u
2, driven stepper motor operation one-period then, and detect " per hour time to " align mode position, according to testing result, or when continuing normally to walk, or enter program block V when forward check and correction chases after
5, or enter reverse check and correction program block V when chasing after
6, or carry out the control of giving the correct time, throw light on, or change the major holiday program block V that gives the correct time over to
7If when promptly not detecting " per hour time to " align mode position and just continuing normally to walk; As detect this mode bit, then with turret clock count value T
1With by calibration clock u
11The sprocket pulse numerical value T that is passed by
2Compare, if T
1＜T
2, then change program block V when forward check and correction chases after over to
5; If T
1＞T
2, program block V when then changing reverse check and correction over to and chasing after
6; If T
1=T
2, then detect by pulse counter module u
2" per hour time to " state of sending into by the I/O module, if do not detect this mode bit, when then continuing to walk, when detecting " per hour the time arrives " state, then will be at that time time C give the correct time and lighting hours compares with predetermined, if time C was in the official hour scope at that time, promptly the lower bound value of giving the correct time＜C＜high limit value of giving the correct time is just returned behind the output time signal; And lower bound illumination value＜C＜high limit illumination value returns after then exporting illumination sign; As detect the major holiday mode bit that gives the correct time, then change the major holiday program block V that gives the correct time over to
7, finishing give the correct time control after return.
As shown in Figure 6 as program program block V when normally walking
4Change program block V when forward check and correction chases after over to
5The time, just start program when forward check and correction chases after, this program block V
5Carry out forward drive stepping motor and move a week, judge calibration clock u then
11Counted number of pulses T
2Counted number of pulses T with turret clock
1Difference whether equal zero.If T
1-T
2=0, then return program block V when normally walking
4If, T
1＜T
2, then continue to carry out this program block, up to T
1-T
2=0, return program block V when normally walking
4
As shown in Figure 7, as program program block V when normally walking
4Program block V when changing reverse check and correction over to and chasing after
6The time, program when just starting reverse check and correction and chasing after, this program block is carried out reverse drive stepping motor and is moved a week, judges the counted number of pulses T of calibration clock then
2With turret clock counted number of pulses T
1Difference whether equal zero, if equal zero, just return program block V when normally walking
4If, also be not equal to zero, then continue circulation and carry out this program, up to T
1-T
2=0, return program block V when normally walking
4
As shown in Figure 8, as program program block V when normally walking
4Change the major holiday program block V that gives the correct time over to
7The time, just to carry out the major holiday to give the correct time, the function of this program block is that the output state of giving the correct time in red-letter day gives the correct time, and after giving the correct time this mode bit is shielded, and returns state when normally walking then.
Delay procedure piece V when normally walking as shown in Figure 9,
8Adopt twin-stage time-delay mode, frequency in the time of can accurately producing turret clock in 50～100Hz scope and walk, program block is called when normally walking, and finishes program block V when returning after twin-stage is delayed time normally to walk
4This program block V
8If delay time constant one-level counter is established delay time constant secondary counter, the secondary counter subtracts 1 up to equaling 0 at every turn, returns the secondary counter after then the one-level counter subtracts 1 and reruns and also equal zero up to this one-level counter, finishes the time-delay process.
Delay procedure piece V when as shown in figure 10, check and correction chases after
9Adopt single-stage time-delay mode, can produce in 1000～1500Hz scope to the time frequency, for forward to the time program block V
2, reverse to the time program block V
3, forward to the time program block V when chasing after
5, reverse to the time program block V when chasing after
6Call.This program block set to the time when chasing after behind the time counting constants device, once counter is subtracted 1, equal zero up to set counter, finish return respectively after the time-delay forward to the time program block V
2, reverse to the time program block V
3, program block V when forward check and correction chases after
5, program block V when reverse check and correction chases after
6
This Control Software is continuously moved, finish come into, to the time, when chasing after, give the correct time, control procedure such as illumination, illumination in red-letter day, guarantee that turret clock accurately moves, use software replace hardware, simplify the structure widely, control method is reliable, the precision height, but long-time running has obtained good effect in practice.
Claims (16)
1, a kind of control device of large tower clock is characterized in that this device is by micro-mainframe computer CPU module u
1, pulse counter module u
2, I/O switching value module u
3, keyboard and display panel u
4, interface circuit plate module u
5, level shifting circuit u
6, turret clock operation board u
7, driving device for step-by-step u
8, turret clock striking mechanism u
9, turret clock lighting device u
10With calibration clock u
11Institute interconnects and forms, promptly in turn with standard clock u
11, level shifting circuit u
6, pulse counter module u
2, host CPU module u
1, I/O switching value module u
3, interface circuit plate module u
5Be connected in series, again with pulse counter module u
2Be connected to interface circuit plate module u
5, with operation board display board u
4Be connected to host CPU module u
1On, interface circuit plate module u
5Connecting turret clock drive unit u respectively
8, turret clock striking mechanism u
9With turret clock lighting device u
10
2, tower clock control unit according to claim 1 is characterized in that described host CPU module u
1Adopt single-chip microcomputer, for example MCS-51 series monolithic.
3, tower clock control unit according to claim 1 is characterized in that described host CPU module u
1Adopt single card microcomputer, for example TP801 single card microcomputer.
4, tower clock control unit according to claim 1 is characterized in that described host CPU can adopt the CPU module of general industry controller, for example TP805 Industrial Control Computer.
5, tower clock control unit according to claim 1 is characterized in that described calibration clock u
11Can adopt the compact high precision crystal clock.
6, tower clock control unit according to claim 1 is characterized in that described stepper motor adopts high-power five phase step motor.
7, a kind of control method of large tower clock, it is characterized in that realizing control procedure by Control Software, pulse signal when being walked by this Control Software generation turret clock by host CPU is to carry out five phase frequency divisions by Control Software to stepper motor, through I/O switching value module u
3With interface module u
5, arrive the turret clock driver, when the driving turret clock was walked, this Control Software was a modular organization, by host control block V
1, forward to the time program block V
2, reverse to the time program block V
3, program block V when normally walking
4, forward to the time program block V when chasing after
5, reverse to the time program block V when chasing after
6, the major holiday program block V that gives the correct time
7, normal delay procedure piece V
8, check and correction delay procedure piece V when chasing after
9Form.
8, tower clock control method according to claim 7 is characterized in that described primary control program piece V
1To I/O switching value module u
3With pulse counter module u
2Carry out initialization, to these two module zero clearings, with at that time to the time the integral point value send into the internal storage location (2500H) of appointment with 16 system numbers, detect turret clock operation board u
7By interface module u
5With I/O switching value module u
3The status signal of sending here, according to detected mode bit, change over to respectively forward to the time program block V
2, reverse to the time program block V
3Or program block V when normally walking
4
9, tower clock control method according to claim 7, it is characterized in that described forward to the time program block V
2The phase sequence that requires according to stepper motor produces soft frequency division, and forward drive stepping motor fortune circles, then to turret clock operation board u
7Each mode bit detect once, according to testing result respectively once more forward drive stepping motor fortune circle, or change over to reverse to the time program block V
3Or change program block V when normally walking over to
4Or return primary control program piece V
1Trace routine.
10, tower clock control method according to claim 7, it is characterized in that described reverse to the time program block V
3The phase sequence that requires according to stepper motor produces soft frequency division, and reverse drive stepping motor fortune circles, then to turret clock operation board u
7Each mode bit detect once, circle according to the reverse once more respectively drive stepping motor fortune of testing result, or change over to forward to the time program block V
2Or change program block V when normally walking over to
4Or return host control block V
1Trace routine.
11, tower clock control method according to claim 7 is characterized in that described program block V when normally walking
4A hour counted number of pulses is sent into pulse counter module u
2, driven stepper motor operation one-period then, detect " per hour time to " align mode position, according to testing result, or when continuing normally to walk, or enter forward that check and correction chases after time-histories piece V
5, or enter reverse check and correction program block V when chasing after
6, or carry out the control of giving the correct time, throw light on, or change the major holiday program block V that gives the correct time over to
7
12, tower clock control method according to claim 7 is characterized in that the described program block V when chasing after that forward proofreads
5Carry out forward drive stepping motor and move a week, judge calibration clock u then
11Counted number of pulses T
2Counted number of pulses T with turret clock
1Difference whether equal zero, if T
1-T
2=0, then return program block V when normally walking
4If, T
1-T
2≠ 0, then continue circulation and carry out this program, up to T
1-T
2Return program block V when normally walking after=0
4
13, tower clock control method according to claim 7, program block V when it is characterized in that described reverse check and correction chases after
6Carry out reverse drive stepping motor fortune and circle, judge calibration clock u then
11Counted number of pulses T
2With turret clock counted number of pulses T
1Difference whether equal 0, if T
1-T
2=0, then return program block V when normally walking
4; If be not equal to 0, then continue circulation and carry out this program block, up to T
1-T
2Return program block V when normally walking after=0
4
14, tower clock control method according to claim 7 is characterized in that the program block V that gives the correct time of described major holiday
7Export the mode bit that gives the correct time red-letter day and give the correct time, after giving the correct time this mode bit is shielded, then return state when normally walking.
15, tower clock control method according to claim 7 is characterized in that described delay procedure piece V when normally walking
8Adopt twin-stage time-delay mode, frequency when accurately producing turret clock in 50～100Hz scope as calculated and walking, program block V when normally walking
4Institute calls, and returns program block V when normally walking after finishing time-delay
4
16, tower clock control method according to claim 7, delay procedure piece V when it is characterized in that described check and correction chases after
9Adopt single-stage time-delay mode, can produce in 1000～1500Hz scope to the time frequency, finish return respectively after the time-delay forward to the time program block V
2, reverse to the time program block V
3, check and correction program block V when chasing after forward
5, program block V when reverse check and correction chases after
6
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108093 CN1017564B (en) | 1990-09-28 | 1990-09-28 | Device and method for controlling large tower clock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108093 CN1017564B (en) | 1990-09-28 | 1990-09-28 | Device and method for controlling large tower clock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050098A true CN1050098A (en) | 1991-03-20 |
| CN1017564B CN1017564B (en) | 1992-07-22 |
Family
ID=4880840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108093 Expired CN1017564B (en) | 1990-09-28 | 1990-09-28 | Device and method for controlling large tower clock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017564B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108319192A (en) * | 2018-01-19 | 2018-07-24 | 山东大学 | Method when turret clock control system and turret clock power down chase after |
| CN108572542A (en) * | 2018-04-28 | 2018-09-25 | 爱国者（北京）电子有限公司 | A kind of pointer calibration method, system and indicator device |
-
1990
- 1990-09-28 CN CN 90108093 patent/CN1017564B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108319192A (en) * | 2018-01-19 | 2018-07-24 | 山东大学 | Method when turret clock control system and turret clock power down chase after |
| CN108572542A (en) * | 2018-04-28 | 2018-09-25 | 爱国者（北京）电子有限公司 | A kind of pointer calibration method, system and indicator device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017564B (en) | 1992-07-22 |
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