CN203422633U - Multi-signal acquisition velocity measurement and reverse rotation protection control device - Google Patents
Multi-signal acquisition velocity measurement and reverse rotation protection control device Download PDFInfo
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- CN203422633U CN203422633U CN201320548519.4U CN201320548519U CN203422633U CN 203422633 U CN203422633 U CN 203422633U CN 201320548519 U CN201320548519 U CN 201320548519U CN 203422633 U CN203422633 U CN 203422633U
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Abstract
The utility model relates to a multi-signal acquisition velocity measurement and reverse rotation protection control device. The multi-signal acquisition velocity measurement and reverse rotation protection control device comprises a signal acquisition device and a controller, wherein the signal acquisition device is used for acquiring a rotation signal of detected rotary machinery equipment, a signal input end of the controller is connected with the signal acquisition device, a control output end of the controller is connected with a host or a control device of the detected rotary machinery equipment, the signal acquisition device comprises a signal generation device and/or a signal detection device, the controller comprises a single-chip microcomputer, a signal acquisition circuit, a pulse shaping circuit, an anti-phase circuit, a DA conversion module, a relay output circuit, a simulation signal output circuit, a communication module, a remote reset and bypass input circuit, a button module, a memory module, a display module and a power source module. The multi-signal acquisition velocity measurement and counter-rotation protection control device realizes forward and reverse rotation detection and protection for the detected rotary machinery equipment, has properties of large rotation speed measuring scope, current circuit break protection for voltage input/output, powerful functions, high precision, strong interference resistance and strong adaptability.
Description
Technical field
The utility model relates to a kind of protection control device of rotating machinery, and specifically a kind of many signals collecting tests the speed and reversal protection control device.
Background technology
The various rotating machineries such as the steam turbine engine of power plant, industrial steam turbine, internal combustion engine, water pump and wind speed all need tachometric survey and protection to control.
On market, all kinds of tachometer gages are a lot, but majority is the sensor of joining appointment, unlike signal and sensor do not accomplished general, and standard is difficult unified, can not meet international market needs.Tachometer gage with reversal protection also has, but in principle, has certain defect.Sum up and judge that the method for rotating has following several:
1, in the Bearing gear orientation of rotating machinery, two orthogonal sensors are installed, be decided to be respectively first for master reference, second is secondary sensor.When forward, the phase differential between master reference signal and secondary sensor signal is 30 ℃; During reversion, between two signals, phase differential is 90 ℃.Utilize like this rotating discriminator circuit just can identify mechanical rotating, but the shortcoming of this method is that cost is high, installs inconvenient.
2, pump rotary speed is measured and protective device patent (application number is 97205954.7) adds special gear with a sensor and judges rotating.On gear, process several groups of large, medium and small crowns, width 3:2:1.Processor can judge rotating through the different pulse train of judgement, more difficult but the method shortcoming is processing technology, and makes gear quantity relatively few, lowers tachometric survey precision.
3, for the reverse rotation detector patent (application number is 200580023415.X) of internal combustion engine, utilize a plurality of teeth and a residual toothed portion, in the time of sensor process, according to the gradient of the different simulating signals that produce or perhaps different calibrating signals, export to judge rotating.But this method is not too suitable to high-speed case, installation site requires strict, and antijamming capability is lower.
Utility model content
For above-mentioned deficiency, the utility model provides testing the speed of a kind of many signals collecting and reversal protection control device, and it not only can measure the rotating speed of rotating machinery, carries out rotating detection and protection, and can measuring accuracy high, antijamming capability is strong.
The technical scheme in the invention for solving the technical problem is: the testing the speed and reversal protection control device of many signals collecting, comprise signal pickup assembly and controller, described signal pickup assembly is in order to gather the rotating signal of tested rotating machinery, it is characterized in that, the signal input part of described controller is connected with signal pickup assembly, and control output end is connected with the control device of host computer or tested rotating machinery;
Described signal pickup assembly comprises signal generation apparatus and/or signal supervisory instrument;
Described controller comprises single-chip microcomputer, signal acquisition circuit, pulse shaping circuit, negative circuit, DA modular converter, outputting circuit for relay, analog signal output circuit, communication module, remote reset and bypass input circuit, key-press module, memory module, display module and power module; Described signal acquisition circuit comprises signal processing circuit and comparator circuit, the input end of described signal processing circuit is connected with collection of simulant signal device, be transported to the input end of comparator circuit and be connected, the input end of described comparator circuit is connected with pulse shaping circuit, described pulse shaping circuit is connected with the input end of single-chip microcomputer and negative circuit respectively by photoelectric isolating circuit, and the output terminal of described negative circuit is connected with single-chip microcomputer; The input end of described DA modular converter is connected with single-chip microcomputer by photoelectric isolating circuit, and output terminal is connected with the input end of comparer; Described outputting circuit for relay, analog signal output circuit, communication module and remote reset are connected with single-chip microcomputer by photoelectric isolating circuit respectively with bypass input circuit; Described key-press module, memory module, display module and power module are connected with single-chip microcomputer respectively.
Preferably, described signal generation apparatus comprises device for generating voltage signal and/or Multi-waveshape signal generator.
Preferably, described signal supervisory instrument comprises rotary encoder, and described rotary encoder is arranged in the rotating shaft of tested rotating machinery.
Preferably, described signal supervisory instrument comprises measure speed gears and contactless detection device, described measure speed gears is fixed in the rotating shaft of tested rotating machinery, and described contactless detection device is arranged near the crown of measure speed gears and is connected with controller by fixed support;
The periphery of described measure speed gears is provided with some groups of tooth roots and crown, and one group of tooth root in described some groups and the width of crown are greater than the width of other group tooth root and crown, and measure speed gears is fixed in the rotating shaft of tested rotating machinery by axis hole;
Described contactless detection device comprises magnetic power rotation speed sensor, magnetic resistance speed sensor, Hall revolution speed sensing, current vortex sensor and door approach switch.
Further, described power module comprises single-ended flyback 3 road output switch power sources and system power supply module, sensor electrical source module, digital power module and communication power supply module, the input end of described single-ended flyback 3 road output switch power sources is connected with input power by anti-surge circuit, and output terminal comprises DC+33V output terminal, DC-33V output terminal and DC+12V output terminal; Described system power supply module comprises MC34063 integrated chip, L7824 three terminal regulator, L7815 three terminal regulator, L7915 three terminal regulator and L7905 three terminal regulator, described MC34063 integrated chip, L7824 three terminal regulator and L7815 three terminal regulator respectively with DC+33V output terminal be connected to controller system provide+5V ,+24V and+operating voltage of 15V, described L7915 three terminal regulator and L7905 three terminal regulator respectively with the DC-33V output terminal provide-5V that is connected to controller system and-operating voltage of 15V; Described sensor electrical source module comprises 2 LM317 three terminal regulators that are connected with DC-33V output terminal with DC+33V output terminal respectively, is the operating voltage of provide+3～+ 24V and-3～-24V of sensor; Described digital power module comprises LM1117 three terminal regulator, and described LM1117 three terminal regulator and DC+12V output terminal are connected to digital circuit provides operating voltage; Described communication power supply module comprises DC/DC isolation module, and described DC/DC isolation module is connected with the output terminal of LM1117 three terminal regulator, for communication module provides operating voltage.
Further, described signal acquisition circuit is comprised of discharge tube DT1, diac D1, backward dioded D2, backward dioded D3, diode D4, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and comparer A.
Further, described display module comprises digital display tube and driving circuit, and described digital display tube is connected with single-chip microcomputer by driving circuit.
Further, described outputting circuit for relay comprises passage OK outputting circuit for relay, zero tachometric relay output circuit, warning outputting circuit for relay and dangerous outputting circuit for relay, described passage OK outputting circuit for relay is connected with normal run indicator, described zero tachometric relay output circuit connects and zero speed light, described warning outputting circuit for relay is connected with warning device, and described dangerous outputting circuit for relay is connected with the control device of tested rotating machinery.
Further, described analog signal output circuit comprises 4～20mA current output circuit.
The beneficial effects of the utility model are:
Described in the utility model test the speed and reversal protection control device by connecting different signal pickup assemblies; have the advantages that tachometric survey scope is large, voltage input is wide, output has current interruption protection and rotating maximum (top) speed memory value; not only powerful; by keyboard setting, can meet various scenes, and hardware is reliable, cost is low; fast response time; precision is high, anti-interference strong, strong adaptability.
The utility model is by being fixed on measure speed gears in the rotating shaft of tested rotating machinery; the signal that gathers measure speed gears by contactless detection device carries out the tachometry of tested rotating machinery, thereby realize, the rotating of tested rotating machinery is detected and protection.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present utility model;
Fig. 2 is the theory diagram of controller described in the utility model;
Fig. 3 is the structural representation of measure speed gears described in the utility model;
Fig. 4 is the power-supply system block diagram of controller described in the utility model;
Fig. 5 is the circuit diagram of the signal acquisition circuit of controller described in the utility model;
Fig. 6 is the crown of measure speed gears described in the utility model and the pulse sequence diagram of tooth root;
In figure, 1 measure speed gears, 11 crowns, 12 tooth roots, 13 axis holes, 2 contactless detection devices, 3 controllers, 4 fixed supports; W1～Wn is the pulse train of crown, the pulse train that B1～Bn is tooth root.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by embodiment, and in conjunction with its accompanying drawing, the utility model is elaborated.
As shown in Figure 1, testing the speed and reversal protection control device of a kind of many signals collecting of the present utility model, comprise signal pickup assembly and controller 3, described signal pickup assembly is in order to gather the rotating signal of tested rotating machinery, the signal input part of described controller 3 is connected with signal pickup assembly, and control output end is connected with the control device of host computer or tested rotating machinery; Described signal pickup assembly comprises signal generation apparatus and/or signal supervisory instrument.Wherein, described signal generation apparatus comprises device for generating voltage signal and/or Multi-waveshape signal generator; Described signal supervisory instrument comprises measure speed gears 1 and contactless detection device 2, described measure speed gears 1 is fixed in the rotating shaft of tested rotating machinery, and described contactless detection device 2 is arranged near the crown of measure speed gears and is connected with controller 3 by fixed support 4; Described contactless detection device comprises magnetic power rotation speed sensor, magnetic resistance speed sensor, Hall revolution speed sensing, current vortex sensor or door approach switch.
As shown in Figure 2, controller described in the utility model comprises STM8S207S8 industry single-chip microcomputer, signal acquisition circuit, pulse shaping circuit, negative circuit, DA modular converter, outputting circuit for relay, analog signal output circuit, communication module, remote reset and bypass input circuit, key-press module, memory module, display module and the power module of ST series; Described signal acquisition circuit comprises signal processing circuit and comparator circuit, the input end of described signal processing circuit is connected with collection of simulant signal device, be transported to the input end of comparator circuit and be connected, the input end of described comparator circuit is connected with pulse shaping circuit, described pulse shaping circuit is connected with the input end of single-chip microcomputer and negative circuit respectively by photoelectric isolating circuit, and the output terminal of described negative circuit is connected with single-chip microcomputer; The input end of described DA modular converter is connected with single-chip microcomputer by photoelectric isolating circuit, and output terminal is connected with the input end of comparer; Described outputting circuit for relay, analog signal output circuit, communication module and remote reset are connected with single-chip microcomputer by photoelectric isolating circuit respectively with bypass input circuit; Described key-press module, memory module, display module and power module are connected with single-chip microcomputer respectively.
As shown in Figure 3, the periphery of measure speed gears 1 described in the utility model is provided with some groups of tooth roots 12 and crown 11, and one group of tooth root in described some groups and the width of crown are two times of width of other group tooth root and crown; The heel radian of described other group tooth root and crown is α, and crown radian is β, and the radian of this group tooth root and crown is respectively 2 α and 2 β, and measure speed gears 1 is fixed in the rotating shaft of tested rotating machinery by axis hole 13.
As shown in Figure 4, further, power module described in the utility model comprises single-ended flyback 3 road output switch power sources and system power supply module, sensor electrical source module, digital power module and communication power supply module, the input end of described single-ended flyback 3 road output switch power sources is connected with input power by anti-surge circuit, and output terminal comprises DC+33V output terminal, DC-33V output terminal and DC+12V output terminal; Described system power supply module comprises MC34063 integrated chip, L7824 three terminal regulator, L7815 three terminal regulator, L7915 three terminal regulator and L7905 three terminal regulator, described MC34063 integrated chip, L7824 three terminal regulator and L7815 three terminal regulator respectively with DC+33V output terminal be connected to controller system provide+5V ,+24V and+operating voltage of 15V, described L7915 three terminal regulator and L7905 three terminal regulator respectively with the DC-33V output terminal provide-5V that is connected to controller system and-operating voltage of 15V; Described sensor electrical source module comprises 2 LM317 three terminal regulators that are connected with DC-33V output terminal with DC+33V output terminal respectively, is the operating voltage of provide+3～+ 24V and-3～-24V of sensor; Described digital power module comprises LM1117 three terminal regulator, and described LM1117 three terminal regulator and DC+12V output terminal are connected to digital circuit provides operating voltage; Described communication power supply module comprises DC/DC isolation module, and described DC/DC isolation module is connected with the output terminal of LM1117 three terminal regulator, for communication module provides operating voltage.
As shown in Figure 5, further, signal acquisition circuit described in the utility model is comprised of discharge tube DT1, diac D1, backward dioded D2, backward dioded D3, diode D4, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and comparer A.
Further, display module described in the utility model comprises digital display tube and driving circuit, and described digital display tube is connected with single-chip microcomputer by driving circuit.
Further, outputting circuit for relay described in the utility model comprises passage OK outputting circuit for relay, zero tachometric relay output circuit, warning outputting circuit for relay and dangerous outputting circuit for relay, described passage OK outputting circuit for relay is connected with normal run indicator, described zero tachometric relay output circuit connects and zero speed light, described warning outputting circuit for relay is connected with warning device, and described dangerous outputting circuit for relay is connected with the control device of tested rotating machinery.
Further, analog signal output circuit described in the utility model comprises 4～20mA current output circuit.
As shown in Fig. 1, Fig. 3 and Fig. 6, a kind of testing the speed and the rotating decision method of reversal protection control device, the rotating that it carries out tested rotating machinery by a kind of measure speed gears 1 is judged, the periphery of described measure speed gears 1 is provided with some groups of tooth roots 12 and crown 11, and one group of tooth root in described some groups and the width of crown are two times of width of other group tooth root and crown; The heel radian of described other group tooth root and crown is α, and crown radian is β, and the radian of this group tooth root and crown is respectively 2 α and 2 β, and measure speed gears 1 is fixed in the rotating shaft of tested rotating machinery by axis hole 13.
The utility model tests the speed and the rotating decision method of reversal protection control device comprises the following steps:
(1) obtain the rotation information of measure speed gears
Contactless detection device 2 is arranged on the cylindrical of crown 11 of measure speed gears 1, and contactless detection device 2 keeps certain distance with the crown 1 of measure speed gears 1, contactless detection device 1 will detect crown signal and send to controller 3;
(2) form rotating train pulse
Usining any measure speed gears position starts first crown 11 of rotating and tooth root 12 as first, last is gear sum n, the crown forming by contactless detection device 2 and the random pulse sequence of tooth root (as shown in Figure 6), the rotating train pulse width that the external interrupt operation by controller 3 or timer internal obtain measure speed gears;
(3) rotating is judged
Regulation is forward counterclockwise, and first controller 3 obtains the pulse of wide tooth root Bi+2, then obtains the pulse of wide crown Wi+2, if two pulses are adjacent, is forward; Otherwise, if first controller obtains the pulse of wide crown Wi+2, then obtain the pulse of wide tooth root Bi+2, and two pulses are adjacent for reversing.
Determine that Bi+2 and Wi+2 are the methods of the maximum broad pulse in tooth root and crown spike train: gather the pulse of a week, by the method for maximizing, find the position of tooth root and crown.If be easy to find relative at the uniform velocity rotating in situation, because the width of this broad pulse is the twice of other pulse widths, even if rotary speed unstabilization also can effectively judge; If but speedup and reduction of speed time just can not find by straightforward procedure, must adopt reducing process to solve.
If first crown width (time) is Wt when starting to rotate, first tooth root width (time) is Bt; By instantaneous velocity this moment as average velocity, the required time summation Tw of n the crown that circle, the required time summation Tb of one week n tooth root, known by the first pulse rotary required time T p=Tw+Tb that circles by calculating.
In the time of non-uniform movement, rotate a circle and need the time also than being Tp, but can be in the hope of required time and mistiming, further try to achieve the variable quantity of pulse on each gear, by augmenting method, can be reduced into approximate uniform speed rotation, so just be easy to try to achieve maximum value and the position of two-way pulse.According to the front and back phase place of two-way pulse maximum value, can judge sense of rotation.
Take below internal combustion engine as example illustrates implementation process of the present utility model:
The axis hole of measure speed gears described in the utility model is fixed in the rotating shaft of internal combustion engine, current vortex sensor is arranged on the cylindrical of measure speed gears by fixed support, the probe of current vortex sensor towards measure speed gears and with crown in a distance, and current vortex sensor is connected with controller, the dangerous outputting circuit for relay of described controller is connected with the tripping operation contactor of internal combustion engine trip circuit.Current vortex sensor sends to controller by the signal of the measure speed gears detecting; controller still reverses according to the forward that receives measure speed gears signal judgement internal combustion engine, if reversion is carried out the operation of internal combustion engine tripping grinder by dangerous outputting circuit for relay output trip signal to the tripping operation contactor of internal combustion engine trip circuit.
Described in the utility model test the speed and the input signal of reversal protection control device can be 70mV 100mV 300mV 500mV 1V etc., signal input form can be square wave, dextrorotation ripple, triangular wave etc.; Sensor input form magnetic power rotation speed sensor, magnetic resistance speed sensor, Hall revolution speed sensing (single binary channels), current vortex sensor, NPN/PNP/OC door approach switch, rotary encoder; not only there is low speed and highly measure measurement range: 0～99999RPM; wide voltage input; output has current interruption protection; there is rotating maximum (top) speed memory value; and control section is powerful; by keyboard setting, can meet various scenes; hardware is reliable; cost is low; fast response time, anti-interference strong, strong adaptability.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.
Claims (9)
1. testing the speed and reversal protection control device of signals collecting more than, comprise signal pickup assembly and controller, described signal pickup assembly is in order to gather the rotating signal of tested rotating machinery, it is characterized in that, the signal input part of described controller is connected with signal pickup assembly, and control output end is connected with the control device of host computer or tested rotating machinery;
Described signal pickup assembly comprises signal generation apparatus and/or signal supervisory instrument;
Described controller comprises single-chip microcomputer, signal acquisition circuit, pulse shaping circuit, negative circuit, DA modular converter, outputting circuit for relay, analog signal output circuit, communication module, remote reset and bypass input circuit, key-press module, memory module, display module and power module; Described signal acquisition circuit comprises signal processing circuit and comparator circuit, the input end of described signal processing circuit is connected with collection of simulant signal device, be transported to the input end of comparator circuit and be connected, the input end of described comparator circuit is connected with pulse shaping circuit, described pulse shaping circuit is connected with the input end of single-chip microcomputer and negative circuit respectively by photoelectric isolating circuit, and the output terminal of described negative circuit is connected with single-chip microcomputer; The input end of described DA modular converter is connected with single-chip microcomputer by photoelectric isolating circuit, and output terminal is connected with the input end of comparer; Described outputting circuit for relay, analog signal output circuit, communication module and remote reset are connected with single-chip microcomputer by photoelectric isolating circuit respectively with bypass input circuit; Described key-press module, memory module, display module and power module are connected with single-chip microcomputer respectively.
2. testing the speed and reversal protection control device of many signals collecting according to claim 1, is characterized in that, described signal generation apparatus comprises device for generating voltage signal and/or Multi-waveshape signal generator.
3. testing the speed and reversal protection control device of many signals collecting according to claim 1, is characterized in that, described signal supervisory instrument comprises rotary encoder, and described rotary encoder is arranged in the rotating shaft of tested rotating machinery.
4. many signals collecting according to claim 1 tests the speed and reversal protection control device, it is characterized in that, described signal supervisory instrument comprises measure speed gears and contactless detection device, described measure speed gears is fixed in the rotating shaft of tested rotating machinery, and described contactless detection device is arranged near the crown of measure speed gears and is connected with controller by fixed support;
The periphery of described measure speed gears is provided with some groups of tooth roots and crown, and one group of tooth root in described some groups and the width of crown are greater than the width of other group tooth root and crown, and measure speed gears is fixed in the rotating shaft of tested rotating machinery by axis hole;
Described contactless detection device comprises magnetic power rotation speed sensor, magnetic resistance speed sensor, Hall revolution speed sensing, current vortex sensor and door approach switch.
5. testing the speed and reversal protection control device according to the many signals collecting described in claim 1 to 4 any one, it is characterized in that, described power module comprises single-ended flyback 3 road output switch power sources and system power supply module, sensor electrical source module, digital power module and communication power supply module, the input end of described single-ended flyback 3 road output switch power sources is connected with input power by anti-surge circuit, and output terminal comprises DC+33V output terminal, DC-33V output terminal and DC+12V output terminal; Described system power supply module comprises MC34063 integrated chip, L7824 three terminal regulator, L7815 three terminal regulator, L7915 three terminal regulator and L7905 three terminal regulator, described MC34063 integrated chip, L7824 three terminal regulator and L7815 three terminal regulator respectively with DC+33V output terminal be connected to controller system provide+5V ,+24V and+operating voltage of 15V, described L7915 three terminal regulator and L7905 three terminal regulator respectively with the DC-33V output terminal provide-5V that is connected to controller system and-operating voltage of 15V; Described sensor electrical source module comprises 2 LM317 three terminal regulators that are connected with DC-33V output terminal with DC+33V output terminal respectively, is the operating voltage of provide+3～+ 24V and-3～-24V of sensor; Described digital power module comprises LM1117 three terminal regulator, and described LM1117 three terminal regulator and DC+12V output terminal are connected to digital circuit provides operating voltage; Described communication power supply module comprises DC/DC isolation module, and described DC/DC isolation module is connected with the output terminal of LM1117 three terminal regulator, for communication module provides operating voltage.
6. testing the speed and reversal protection control device according to the many signals collecting described in claim 1 to 4 any one; it is characterized in that, described signal acquisition circuit is comprised of discharge tube DT1, diac D1, backward dioded D2, backward dioded D3, diode D4, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and comparer A.
7. according to the testing the speed and reversal protection control device of the many signals collecting described in claim 1 to 4 any one, it is characterized in that, described display module comprises digital display tube and driving circuit, and described digital display tube is connected with single-chip microcomputer by driving circuit.
8. testing the speed and reversal protection control device according to the many signals collecting described in claim 1 to 4 any one, it is characterized in that, described outputting circuit for relay comprises passage OK outputting circuit for relay, zero tachometric relay output circuit, warning outputting circuit for relay and dangerous outputting circuit for relay, described passage OK outputting circuit for relay is connected with normal run indicator, described zero tachometric relay output circuit connects and zero speed light, described warning outputting circuit for relay is connected with warning device, described dangerous outputting circuit for relay is connected with the control device of tested rotating machinery.
9. according to the testing the speed and reversal protection control device of the many signals collecting described in claim 1 to 4 any one, it is characterized in that, described analog signal output circuit comprises 4～20mA current output circuit.
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| CN201320548519.4U CN203422633U (en) | 2013-09-04 | 2013-09-04 | Multi-signal acquisition velocity measurement and reverse rotation protection control device |
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| CN201320548519.4U CN203422633U (en) | 2013-09-04 | 2013-09-04 | Multi-signal acquisition velocity measurement and reverse rotation protection control device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439907A (en) * | 2013-09-04 | 2013-12-11 | 济南大学 | Multi-signal-acquisition speed-measurement and reversed-rotation protection and control device and reversed-rotation judgment method |
| CN105864020A (en) * | 2016-05-06 | 2016-08-17 | 江阴市第三电子仪器有限公司 | Monitoring device for preventing backflow of water pump |
| CN112730876A (en) * | 2020-12-22 | 2021-04-30 | 山东华阳众能动力科技有限公司 | Speed measuring system of rotary mechanical equipment |
-
2013
- 2013-09-04 CN CN201320548519.4U patent/CN203422633U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439907A (en) * | 2013-09-04 | 2013-12-11 | 济南大学 | Multi-signal-acquisition speed-measurement and reversed-rotation protection and control device and reversed-rotation judgment method |
| CN103439907B (en) * | 2013-09-04 | 2016-04-27 | 济南大学 | Multi signal collection test the speed and reversal protection control device and reversion decision method |
| CN105864020A (en) * | 2016-05-06 | 2016-08-17 | 江阴市第三电子仪器有限公司 | Monitoring device for preventing backflow of water pump |
| CN105864020B (en) * | 2016-05-06 | 2018-06-22 | 江阴市第三电子仪器有限公司 | Water pump anti-backflow monitoring device |
| CN112730876A (en) * | 2020-12-22 | 2021-04-30 | 山东华阳众能动力科技有限公司 | Speed measuring system of rotary mechanical equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20160904 |