WO2023029308A1

WO2023029308A1 - Loss detection system for carbon slide plate of pantograph

Info

Publication number: WO2023029308A1
Application number: PCT/CN2021/141073
Authority: WO
Inventors: 郑一博; 马媛媛; 王远; 李思勉; 刘强; 张磊; 李聚光
Original assignee: 河北地质大学
Priority date: 2021-08-31
Filing date: 2021-12-24
Publication date: 2023-03-09
Also published as: CN113670881A

Abstract

A loss detection system for a carbon slide plate of a pantograph, which system relates to the technical field of optical detection. The system comprises an open-circuit alarm module, which is in communication connection with a controller, and comprises an open-circuit light source driving circuit and an open-circuit signal detection circuit, wherein the open-circuit light source driving circuit comprises a light-emitting diode (D4), and the open-circuit signal detection circuit comprises a first optical signal receiver; and the light-emitting diode (D4) is connected, by means of an optical fiber, to a fluorescence sensing probe which is embedded in a carbon slide plate, and the fluorescence sensing probe is optically connected to the first optical signal receiver by means of an optical fiber. The detection system can accurately obtain the wear condition of a carbon slide plate, and can also raise an alarm in a timely manner, so as to remind a worker to replace the carbon slide plate in a timely manner, thereby improving the convenience of carbon slide plate detection. In addition, information transmission is performed by using an optical fiber, and can be completed by means of a single optical fiber; and a controller can be conveniently embedded, such that the feasibility and accuracy of the system can be improved.

Description

A loss detection system for pantograph carbon slide

technical field

The invention relates to the technical field of optical detection, in particular to a loss detection system of a pantograph carbon slide.

Background technique

The pantograph carbon slide is an electrical device that absorbs electric energy by friction between the locomotive and the catenary. The friction between the carbon slide and the catenary will inevitably cause wear. In order to ensure that the carbon slide on the train is not worn out, the wear of the carbon slide must be monitored. To timely replace the pantograph and lift the bow in time to ensure the normal power supply of the train. At the same time, during the operation of the train, the carbon skateboard will generate heat due to the large current generated during the contact with the catenary, and the carbon skateboard is made of elastic strips and aluminum brackets. High temperature may cause it to break , glue opening, warping deformation, etc., so the temperature of the carbon skateboard needs to be monitored.

The traditional pantograph wear monitoring method is through manual monitoring. When the train stops at the station, the staff uses measuring tools to measure the wear of the pantograph. This method is difficult to monitor the abnormal wear of the pantograph and the inspection efficiency is too low.

At present, the temperature monitoring of the carbon slide of the pantograph is to monitor the temperature by embedding an ordinary optical fiber temperature sensor in the carbon slide. And these monitoring devices are single carbon skateboard wear monitoring or temperature monitoring, and when freezing rain, rain and snow, and environmental pollution are serious, it is difficult to accurately and real-time monitor the wear value of carbon skateboards; and ordinary temperature sensor probes are composed of multiple Composed of optical fibers, the emitting end and receiving end of the light source are on different optical fibers, and too many optical fiber sensors are not suitable for the monitoring of extremely narrow spaces such as carbon slides and carbon strips.

Contents of the invention

The invention provides a pantograph carbon sliding plate loss detection system, which has the characteristics of high detection precision, fast response speed and high fault tolerance rate.

Technical scheme of the present invention is as follows:

A loss detection system for a pantograph carbon slide, comprising a circuit breaker alarm module, the circuit breaker alarm module is connected to a controller through communication, characterized in that the circuit breaker alarm module includes a circuit breaker light source drive circuit, a circuit breaker signal detection circuit, the The circuit breaker light source driving circuit includes a light emitting diode, and the circuit breaker signal detection circuit includes a first light signal receiver, and the light emitting diode is connected with a fluorescent sensing probe buried inside the carbon slide through an optical fiber, and the fluorescent sensing probe is optically connected through the optical fiber. Connect the first optical signal receiver.

As a further optimization of this solution, multiple fluorescent sensing probes are connected to the optical fiber, each fluorescent sensing probe is evenly distributed along the optical fiber, and the excitation color of each fluorescent sensing probe is different.

As a further optimization of this solution, the open-circuit light source driving circuit includes an inverter U10, a light-emitting diode D4, and a resistor R33, and the resistor R33 is connected between the 3A pin and the 3Y pin of the inverter U10, and the inverter A resistor R35 and a light-emitting diode D4 are connected in series between the 3Y pin of the device U10 and the potential ground, and the light-emitting diode D4 points to the potential ground.

As a further optimization of this solution, the off-circuit light source driving circuit further includes a diode D3 and a resistor R34 connected in series, the series circuit of the diode D3 and the resistor R34 is connected in parallel with the resistor R33, and the diode D3 points to the 3A pin of the inverter U10 mentioned above.

As a further optimization of this solution, the first signal generator is a light effect tube D5, and the open circuit signal detection circuit also includes an amplification unit and a judging unit, and the light is connected in series between the input end of the amplification unit and the potential ground. Effect tube D5, the output end of the amplifying unit is connected to the input end of the judging unit, and the output end of the judging unit is connected to the controller.

As a further optimization of this solution, the amplifying unit includes an amplifier U12A and an amplifier U12B, and the reverse end of the amplifier U12B is used as the input end of the amplifying unit through a capacitor C24, and is connected to the output end of the light effect tube D5, so The output end of the amplifier U12B is connected to the inverting end of the amplifier U12B through a resistor R49 and a capacitor C29 connected in parallel. The reverse ends are connected through a diode D6, the diode D6 points to the same direction end of the amplifier U12B, the output end of the amplifier U12B is connected to one end of the resistance end of the varistor VR1 through a resistor C32, and the other end of the varistor VR1 One resistor end is externally connected with a voltage source V1 as a boosted voltage source, the sliding end of the rheostat VR1 is connected to the same direction end of the amplifier U12A, the output end of the amplifier U12B passes through the resistor C32 and the fixed part of the rheostat VR1, and connects with the amplifier A capacitor C27, a resistor R41, and a capacitor C30 are connected in series at the inverting end of U12A, and a resistor R43 and a capacitor C28 connected in parallel are connected between the output end of the amplifier U12A and the inverting end, and the output end of the amplifier U12A serves as the The output terminal of the amplifying unit.

As a further optimization of this solution, the judging unit includes a comparator U11B and a transistor Q1, the inverting end of the comparator U11B is used as the input end of the judging unit, and the non-inverting end of the comparator U11B is connected through a resistor R47 The voltage source V1 is used as a reference voltage, the output terminal of the comparator U11B is connected to the base of the triode Q1 through a resistor R50 and a capacitor C31 connected in series, and the collector of the transistor Q1 is connected to the voltage source through a resistor R40, and acts as the The output end of the judging unit is connected to the controller, and the base of the triode Q1 is grounded.

As a further optimization of this solution, the detection system also includes a temperature measurement module, the temperature measurement module includes a temperature measurement light source drive circuit, a fluorescent feedback circuit and a temperature measurement probe, the temperature measurement probe is set in the carbon slide, and the temperature measurement module The temperature probe is provided with a temperature-sensitive phosphor, the temperature measurement light source drive circuit includes a light-emitting diode LED2, the fluorescent feedback circuit includes a second signal receiver, the light-emitting diode LED2 of the temperature measurement light source drive circuit, the second signal receiver The detector and temperature measuring probe are connected by optical fiber optic path.

As a further optimization of this solution, the temperature measurement light source drive circuit includes a comparator U9 and a MOS transistor T2, the light-emitting diode LED2 is connected in series with the MOS transistor T2 to the reverse end of the comparator U9, and the anode of the light-emitting diode LED2 is connected to the 12V A voltage source, the cathode of the light-emitting diode is connected to the drain of the MOS transistor T2, the gate of the MOS transistor T2 is connected to the output terminal of the comparator U9, and the non-inverting end of the comparator U9 is connected to the ground with series resistors R28 and R29 , the inverting end of the comparator U9 is also connected to the R30 ground, and the VDD pin of the comparator U9 is connected to a voltage source.

As a further optimization of this solution, the fluorescent feedback circuit includes an amplifier U1A and an amplifier U1B, and the second signal receiver includes a light effect transistor D1. The current output end of the light effect transistor D1 is connected to the reverse end of the amplifier U1B. , the same direction end of the amplifier U1B is connected to a voltage source through a resistor R17 as a boosted voltage, the output end of the amplifier U1B is connected with a parallel resistor R5 and a capacitor C11 to the inverse end of the amplifier U1B, the amplifier U1B The output end is connected to the inverting end of the amplifier U1A through a resistor R4, and the inverting end of the amplifier U1A is grounded through a resistor R8 and a resistor R11 connected in series, and a reference voltage is connected to the series connection point of the resistor R8 and the resistor R11 source Vref, the series point of the resistor R8 and the resistor R11 is also connected to a voltage source through the resistor R9, the output terminal of the amplifier U1A is connected to the reverse terminal of the amplifier U1A through the resistor R6, and the output of the amplifier U1A The terminal is connected to the controller as the output terminal of the fluorescent anti-peeping circuit.

Working principle of the present invention and beneficial effect are:

In this application, the optical fiber is embedded in the carbon strip of the carbon slide, and the optical fiber is distributed and connected with a fluorescent sensor probe. The optical fiber port sends out a certain frequency optical signal through the optical fiber. According to the optical information reflected by the fluorescent sensor probe, the wear condition of the carbon strip is obtained. , if the optical fiber is worn out, the optical signal cannot be received normally, indicating that there is a problem with the carbon slide, and the system will send the information to the controller in time, and the controller will control other external modules to issue an alarm.

Through this method, the wear condition of the carbon skateboard can be accurately obtained, and at the same time, an alarm is issued in time to remind the staff to replace it in time, which improves the convenience of carbon skateboard detection; this scheme uses optical fiber for information transmission, and can be completed through a single optical fiber, which is convenient Embedding the controller can improve the feasibility and accuracy of the system.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the structure and principle schematic diagram of the present application;

Fig. 2 is the functional block diagram of the circuit breaker alarm module of the present application;

Fig. 3 is the functional block diagram of the temperature measuring module in the present application;

Fig. 4 is the circuit schematic diagram of the circuit breaker light source driving circuit of the present application;

Fig. 5 is the circuit schematic diagram of the circuit breaker signal detection circuit of the present application;

Fig. 6 is the circuit schematic diagram of the temperature measuring light source driving circuit in the present application;

FIG. 7 is a circuit schematic diagram of the fluorescent feedback circuit in the present application.

In the figure: 1. Controller, 2. Optical signal generator, 3. Fluorescent sensor probe, 4. Optical filter, 5. Optical signal receiver, 6. Optical fiber, 7. Detection layer, 8. Wear layer, 9 , Aluminum bracket, 10, temperature probe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all involve the protection scope of the present invention.

Specific embodiment 1,

As shown in

Specifications

1 and 2, a pantograph carbon slide loss detection system includes a circuit breaker alarm module, which is connected to a controller for communication, and is characterized in that the circuit breaker alarm module includes a circuit breaker light source drive circuit . An open circuit signal detection circuit, the open circuit light source driving circuit includes a light emitting diode, the open circuit signal detection circuit includes a first optical signal receiver, and the light emitting diode is connected with a fluorescent sensor probe buried inside the carbon slide plate through an optical fiber, so The fluorescence sensing probe is connected to the first optical signal receiver through optical fiber. The optical fiber is connected with a plurality of fluorescent sensing probes, each fluorescent sensing probe is evenly distributed along the optical fiber, and the excitation color of each fluorescent sensing probe is different.

The light source drive circuit sends out a flickering signal at a certain frequency to excite the diode as a flickering light source, and transmits the optical signal to the fluorescent sensor probe through the optical fiber. The optical signal is sent to the first signal generator. Since the fluorescent sensing probes with different excitation colors are evenly distributed on the optical fiber, and all of them are buried in the carbon strip of the pantograph, when the carbon strip is worn to a certain extent, the optical fiber is broken, so that from the breakpoint of the optical fiber, it is close to the first The fluorescence sensing probe of an optical signal receiver is normally excited, and transmits the optical signal to the first optical signal receiver, while the fluorescence sensing probe far away from the first optical signal receiver from the breakpoint cannot be excited, and the corresponding light The signal cannot be transmitted to the first optical signal receiver, so the breakpoint of the carbon strip can be judged according to the light color received by the first functional signal receiver.

As shown in Figure 4 of the specification, the open-circuit light source drive circuit includes an inverter U10, a light-emitting diode D4, and a resistor R33. The resistor R33 is connected between the 3A pin and the 3Y pin of the inverter U10, and the inverter A resistor R35 and a light-emitting diode D4 are connected in series between the 3Y pin of the phase controller U10 and the potential ground, and the light-emitting diode D4 points to the potential ground. The off-circuit light source driving circuit further includes a diode D3 and a resistor R34 connected in series, the series circuit of the diode D3 and the resistor R34 is connected in parallel with the resistor R33, and the diode D3 points to 3A of the inverter U10 pins.

Inverter U10 is a Schmitt trigger, in which the 3A and 3Y pins of the Schmitt trigger are connected through a resistor R33 to form a multivibrator, because the waveform generated by the oscillator can be occupied by the diode D3 and resistor R34 The empty ratio is adjusted so that the light emitting diode D4 emits a blinking light signal at a fixed frequency to excite the fluorescence sensing probe, and the fluorescence sensing probe emits excited fluorescence to the first light signal receiver at intervals when the light emitting diode D4 is off.

As shown in Figure 5 of the specification, the first signal generator is a light effect tube D5, and the open circuit signal detection circuit also includes an amplifying unit and a judging unit, and the input terminal of the amplifying unit is connected in series with the potential ground. The light effect tube D5, the output end of the amplifying unit is connected to the input end of the judging unit, and the output end of the judging unit is connected to the controller. The amplifying unit includes an amplifier U12A and an amplifier U12B, the reverse end of the amplifier U12B is used as the input end of the amplifying unit through a capacitor C24, and is connected to the output end of the light effect tube D5, and the output end of the amplifier U12B is passed through The resistor R49 and the capacitor C29 connected in parallel are connected to the inverting end of the amplifier U12B, the leading end of the amplifier U12B is externally connected with a V1 voltage source as a boosted voltage, and a diode is passed between the same end and the inverting end of the amplifier U12B D6 is connected, the diode D6 points to the same direction end of the amplifier U12B, the output end of the amplifier U12B is connected to one end of the resistance end of the rheostat VR1 through the resistor C32, and the other resistance end of the rheostat VR1 is externally connected to a voltage source V1 As a boosted voltage source, the sliding end of the rheostat VR1 is connected to the same direction end of the amplifier U12A, the output end of the amplifier U12B passes through the resistor C32 and the fixed part of the rheostat VR1, and is connected in series with the reverse end of the amplifier U12A There is a capacitor C27, a resistor R41 and a capacitor C30. A resistor R43 and a capacitor C28 are connected in parallel between the output terminal and the reverse terminal of the amplifier U12A. The output terminal of the amplifier U12A is used as the output terminal of the amplifying unit. The judging unit includes a comparator U11B and a transistor Q1, the inverting end of the comparator U11B is used as the input end of the judging unit, the non-inverting end of the comparator U11B is connected to the voltage source V1 through a resistor R47 as a reference voltage, The output terminal of the comparator U11B is connected to the base of the triode Q1 through a resistor R50 and a capacitor C31 connected in series, and the collector of the transistor Q1 is connected to a voltage source through a resistor R40, and is used as the output terminal of the judgment unit and The controller is connected, and the base of the triode Q1 is grounded.

The light-emitting diode D4 generates an optical signal of a certain frequency, which is transmitted by the optical fiber and received by the photodiode D5 to generate an electric pulse signal. Capacitors C25, C26 and resistors R36, R37 jointly filter the power supply. Diode D6 is a protection circuit. The current signal generated by D5 Transimpedance amplification is performed through U12B, the current is converted into a voltage signal through the resistor R49, and then output from the output terminal of the amplifier U12B, and the capacitors C32, C27 and C30 act as filters, and the output voltage signal is amplified by the amplifier U12A and then input to the comparator U11B for comparison The input of the non-inverting terminal of the comparator U11B is the reference voltage, and the output of the comparator U11B controls the on-off of the triode Q1, thereby realizing the control of the output of Vout1, the controller judges the wear of the carbon slide according to the Vout1 signal, and the inductor L2 filters the power supply role.

Specific embodiment 2,

As shown in accompanying drawing 3 of the description, on the basis of specific embodiment 1, the detection system also includes a temperature measurement module, the temperature measurement module includes a temperature measurement light source drive circuit, a fluorescent feedback circuit and a temperature measurement probe, the temperature measurement The probe is arranged in the carbon slide, the temperature-measuring probe is provided with temperature-sensitive phosphor powder, the temperature-measuring light source driving circuit includes a light-emitting diode LED2, the fluorescent feedback circuit includes a second signal receiver, and the temperature-measuring light source drives The light-emitting diode LED2 of the circuit, the second signal receiver and the temperature measuring probe are connected by means of an optical fiber optical path.

The wear of the carbon strips in the carbon skateboard will vary according to the temperature, and because the heat generated by the friction of the carbon strips during the operation of the high-speed rail is very high, the influence of the temperature on the wear cannot be ignored. The controller can use the second signal The light signal collected by the receiver calculates the temperature of the current carbon slide, and when the temperature is too high, an alarm will be issued to remind the staff. The temperature measurement principle of this scheme is that the temperature measurement light source drive circuit controls the light-emitting diode LED2 to emit a frequency light source, and the temperature measurement probe is excited through the optical fiber. The wavelength of the excitation light is transmitted to the second signal receiver through the optical fiber, and the fluorescent feedback circuit processes the obtained light information and sends it to the controller to calculate the temperature.

As shown in Figure 6 of the specification, the temperature measurement light source driving circuit includes a comparator U9 and a MOS transistor T2, the light-emitting diode LED2 is connected in series with the MOS transistor T2 to the reverse end of the comparator U9, and the anode of the light-emitting diode LED2 is connected to 12V voltage source, the cathode of the light-emitting diode is connected to the drain of the MOS transistor T2, the gate of the MOS transistor T2 is connected to the output terminal of the comparator U9, and the non-inverting end of the comparator U9 is connected in series with resistors R28 and R29 ground, the inverting end of the comparator U9 is also connected to the R30 ground, and the VDD pin of the comparator U9 is connected to a voltage source.

The principle of this circuit is that when the MOS transistor T2 is turned off, the VIN- pin of the comparator U9 is connected to a low potential, which is lower than the reference voltage of VIN+, and the Vout2 pin outputs a high potential, so that the gate of the MOS transistor T2 is connected to a high potential. The MOS transistor T2 is turned on, the light-emitting diode LED2 emits light, VIN- is connected to a high potential higher than the reference voltage point VIN+, and Vout2 has changed to a low potential, the gate of the MOS transistor T2 becomes a low potential, and the N-channel of the MOS transistor T2 pinch off, so that the MOS tube T2 is pinched off, so as to realize the periodic change of the on-off situation in the circuit, so that the light-emitting diode LED2 emits a flashing light signal.

As shown in Figure 6 of the specification, the fluorescent feedback circuit includes an amplifier U1A and an amplifier U1B, and the second signal receiver includes a light effect transistor D1. The current output terminal of the light effect transistor D1 is connected to the reverse side of the amplifier U1B. terminal, the same direction terminal of the amplifier U1B is connected to a voltage source through a resistor R17 as a boost voltage, the output terminal of the amplifier U1B is connected with a parallel resistor R5 and a capacitor C11 to the reverse terminal of the amplifier U1B, and the amplifier U1B The output end of the amplifier U1A is connected to the inverting end of the amplifier U1A through the resistor R4, and the same direction end of the amplifier U1A is grounded through the resistor R8 and the resistor R11 connected in series, and the series connection point of the resistor R8 and the resistor R11 is connected to a reference A voltage source Vref, the series point of the resistor R8 and the resistor R11 is also connected to a voltage source through a resistor R9, the output terminal of the amplifier U1A is connected to the reverse terminal of the amplifier U1A through a resistor R6, and the output terminal of the amplifier U1A The output terminal is connected to the controller as the output terminal of the fluorescent peep-proof circuit.

When the light effect tube D1 receives the light signal excited by the temperature measuring probe, it is converted into a corresponding current signal and then amplified by the two stages of amplifier U1B and amplifier U1A. At the same time, U1A is connected to the boost voltage Vref to raise the voltage to the controller. The controller processes the identified size according to the output signal, and calculates the temperature information sensed by the temperature measuring probe.

Specific embodiment 3, as shown in accompanying drawing 1 of description,

The carbon strip has a double-layer structure, including a monitoring detection layer and a wear layer 8. The fluorescent sensing probe 3 is arranged in the detection layer 7, and one side of the detection layer 7 is connected to the aluminum bracket 9. The other side of the detection layer 7 is detachably connected to the wear layer 8 .

The detection layer 7 is wrapped with an optical information acquisition unit and a temperature information acquisition unit, which is more falsified, while the wear layer 8 is a simple carbon strip, and the falsification is relatively lower. When the wear layer 8 is worn to a certain extent, the electrical signal acquisition unit detects When the current drops to the threshold point, the staff will be prompted to check the carbon strip, and the wear layer 8 may need to be replaced. The wear layer 8 and the detection layer 7 can be connected in a detachable manner such as glue, slot or rivet. A combination of multiple detachable connections can also be used.

Optical connection in this article refers to the connection of optical paths conducted by means of optical fibers.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention within.

Claims

A loss detection system for a pantograph carbon slide, comprising a circuit breaker alarm module, the circuit breaker alarm module is connected to a controller through communication, characterized in that the circuit breaker alarm module includes a circuit breaker light source drive circuit, a circuit breaker signal detection circuit, the The circuit breaker light source driving circuit includes a light emitting diode, and the circuit breaker signal detection circuit includes a first light signal receiver, and the light emitting diode is connected with a fluorescent sensing probe buried inside the carbon slide through an optical fiber, and the fluorescent sensing probe is optically connected through the optical fiber. Connect the first optical signal receiver.
The loss detection system of a pantograph carbon slide according to claim 1, wherein a plurality of fluorescent sensing probes are connected to the optical fiber, each fluorescent sensing probe is evenly distributed along the optical fiber, and each fluorescent sensing probe Probes have different excitation colors.
The loss detection system of a pantograph carbon slide according to claim 1, wherein the disconnected light source driving circuit includes an inverter U10, a light-emitting diode D4 and a resistor R33, and 3A of the inverter U10 A resistor R33 is connected between the pin and the 3Y pin, and a resistor R35 and a light-emitting diode D4 are connected in series between the 3Y pin of the inverter U10 and the potential ground, and the light-emitting diode D4 points to the potential ground.
A loss detection system for a pantograph carbon slide according to claim 3, wherein the disconnected light source driving circuit further includes a diode D3 and a resistor R34 connected in series, and the diode D3 and the resistor R34 are connected in series The circuit is connected in parallel with the resistor R33, and the diode D3 points to the 3A pin of the inverter U10.
The loss detection system of a pantograph carbon slide according to claim 1, wherein the first signal generator is a light effect tube D5, and the circuit breaker signal detection circuit also includes an amplification unit and a judgment unit, The light effect tube D5 is connected in series between the input end of the amplifying unit and the potential ground, the output end of the amplifying unit is connected to the input end of the judging unit, and the output end of the judging unit is connected to the controller.
The loss detection system of a pantograph carbon slide according to claim 5, wherein the amplifying unit includes an amplifier U12A and an amplifier U12B, and the reverse end of the amplifier U12B is used as the amplifying unit via a capacitor C24 The input terminal of the amplifier U12B is connected to the output terminal of the light effect tube D5, and the output terminal of the amplifier U12B is connected to the reverse terminal of the amplifier U12B through a resistor R49 and a capacitor C29 connected in parallel, and the leading end of the amplifier U12B is externally connected to The V1 voltage source is used as the boost voltage, and the same-directional end and the reverse end of the amplifier U12B are connected through a diode D6, and the diode D6 points to the same-directional end of the amplifier U12B, and the output end of the amplifier U12B passes through a resistor C32 is connected to one end of the resistance end of the rheostat VR1, the other resistance end of the rheostat VR1 is externally connected to a voltage source V1 as a boost voltage source, the sliding end of the rheostat VR1 is connected to the same direction end of the amplifier U12A, and the end of the amplifier U12B The output end passes through the fixed part of the resistor C32 and the rheostat VR1, and a capacitor C27, a resistor R41, and a capacitor C30 are connected in series with the reverse end of the amplifier U12A, and a parallel connection is connected between the output end of the amplifier U12A and the reverse end. The resistor R43 and the capacitor C28, the output terminal of the amplifier U12A is used as the output terminal of the amplification unit.
The loss detection system of a pantograph carbon slide according to claim 5, wherein the judging unit includes a comparator U11B and a transistor Q1, and the reverse end of the comparator U11B is used as the judging unit The input terminal, the same direction terminal of the comparator U11B is connected to the voltage source V1 as a reference voltage through the resistor R47, and the output terminal of the comparator U11B is connected to the base of the triode Q1 through the resistor R50 and the capacitor C31 connected in series, so The collector of the triode Q1 is connected to a voltage source through a resistor R40, and is connected to the controller as the output terminal of the judging unit, and the base of the triode Q1 is grounded.
A pantograph carbon slide loss detection system according to claim 1, characterized in that the detection system also includes a temperature measurement module, and the temperature measurement module includes a temperature measurement light source drive circuit, a fluorescent feedback circuit and a temperature measurement module. Probe, the temperature measuring probe is set in the carbon slide, the temperature measuring probe is equipped with temperature-sensitive phosphor powder, the temperature measuring light source driving circuit includes a light emitting diode LED2, and the fluorescent feedback circuit includes a second signal receiver, The light emitting diode LED2, the second signal receiver and the temperature measuring probe of the temperature measuring light source drive circuit are connected by optical fiber.
A pantograph carbon slide loss detection system according to claim 8, characterized in that, the temperature measurement light source drive circuit includes a comparator U9 and a MOS transistor T2, and the light emitting diode LED2 is connected in series with the MOS transistor T2 The reverse end of the comparator U9, the anode of the light-emitting diode LED2 is connected to a 12V voltage source, the cathode of the light-emitting diode is connected to the drain of the MOS transistor T2, and the gate of the MOS transistor T2 is connected to the output terminal of the comparator U9 , the non-inverting end of the comparator U9 is connected to the ground with resistors R28 and R29 connected in series, the inverting end of the comparator U9 is also connected to R30 to be grounded, and the VDD pin of the comparator U9 is connected to a voltage source.
A pantograph carbon slide loss detection system according to claim 8, characterized in that, the fluorescent feedback circuit includes amplifier U1A and amplifier U1B, and the second signal receiver includes light effect tube D1. The current output terminal of the effect tube D1 is connected to the reverse terminal of the amplifier U1B, and the same-direction terminal of the amplifier U1B is connected to a voltage source as a boosted voltage through a resistor R17, and the output terminal of the amplifier U1B is connected to the reverse terminal of the amplifier U1B. terminal is connected with a resistor R5 and a capacitor C11 in parallel, the output terminal of the amplifier U1B is connected to the reverse terminal of the amplifier U1A through a resistor R4, and the same direction terminal of the amplifier U1A is grounded through a resistor R8 and a resistor R11 connected in series, The series point of the resistor R8 and the resistor R11 is connected to a reference voltage source Vref, the series point of the resistor R8 and the resistor R11 is also connected to a voltage source through a resistor R9, and the output terminal of the amplifier U1A is connected to a voltage source through a resistor R6 The inverting terminal of the amplifier U1A is connected, and the output terminal of the amplifier U1A is connected to the controller as the output terminal of the fluorescent privacy protection circuit.