CN114675700A - Scaffold safety inspection system - Google Patents
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
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- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The application relates to a scaffold safety detection system, including detection circuitry, paster circuit and the output stabilizing circuit who connects gradually. According to the scaffold safety detection system designed at this time, a passive strain sensor sensitive to pressure strain is adopted as a signal receiving port of a patch circuit, and the sensor is built on a flexible circuit board, so that high adaptability of the circuit to an application scene is guaranteed; in the detection circuit, firstly, a voltage variable signal acquired by the patch circuit is read and output; in the output stabilizing circuit, the read signal can be stabilized and amplified, then the signal is compared with a threshold value for calculation, and whether an alarm is triggered or not is judged, so that the function of detection and early warning is realized.
Description
Technical Field
The application relates to the field of scaffolds and safety detection, in particular to a scaffold safety detection system.
Background
The scaffold is a building construction tool which is erected for safety protection, worker operation and horizontal transportation of floors on a construction site, has the advantages of convenience in assembly and disassembly, flexibility in erection, strong universality, economy and the like, and becomes a facility which is most used and most commonly applied in the current building engineering. With the development of the building industry in China, the collapse accident of the scaffold sometimes happens, and huge casualties and economic losses are caused. Therefore, it is necessary to research the safety control measures for the construction of the steel pipe scaffold. After analyzing the reasons of the collapse accidents of the fastener type scaffold, the reasons can be almost found from the aspect of procedural safety management except some sudden accidental factors. The service cycle of the steel pipe scaffold generally comprises all links which run through the main body construction, such as design, scaffold building, use, disassembly, material equipment maintenance and the like. The control measure of each link in the service cycle can both influence the security of fastener-type steel pipe scaffold structure, if the control measure of scaffold structure became invalid and will influence the smooth realization of construction project progress target, also can cause personnel's injures and deaths and economic huge loss, is unfavorable for engineering cost's control.
And scaffold frame is in the continuous use, it can warp slowly, because the component is more, and it has been out of shape to have more difficult control, and its security has great hidden danger, through scaffold frame safety detection system, installs paster detection circuitry in scaffold frame easy deformable's key position, then regularly uses detection circuitry device to patrol each paster circuit point, obtains the deflection, carries out safety inspection, guarantees scaffold frame's whole security performance.
As shown in fig. 1, the current detection circuit of the prior art adopts a MOS transistor as an amplification element as a whole, which can achieve a low-power consumption and high-stability operating state, but has insufficient driving capability, low sensitivity, and is susceptible to environmental temperature influence to cause detection errors.
As shown in FIG. 2, the voltage-variable sensor circuit of the prior art is formed by four resistors, has a simple structure and good sensitivity, but is difficult to adapt to rugged ground surface and has a narrow adaptation field.
Disclosure of Invention
Problem (A)
1. In the scaffold detection device in the prior art, the sensor is narrow in application field and poor in application scene inclusion.
2. The scaffold detection device in the prior art is low in sensitivity and low in detection precision.
(II) technical scheme
To above-mentioned technical problem, this application provides a scaffold frame safety inspection system, including the paster circuit, detection circuitry and the output stabilizing circuit who connects gradually.
The patch circuit detects signals through a passive strain device CB1, the signals enter an inverting end of an amplifier U1A after passing through an inductor L1, a diode D1 plays a voltage clamping role, a capacitor C2 and a resistor R8 play a RC filtering role, the strain signals are monitored after passing through the amplifier U1A, the output signals are fed back to a same-phase end of the amplifier U1A after being divided by a MOS tube Q19, a resistor R9 and a resistor R10, the output voltage depends on the ratio of a feedback resistor R9 to reference voltage, the adjustment rate of the output voltage is determined by the bandwidth of an error amplifier, collected signals are output after being filtered by a capacitor C3, the signals increase the output power of the signals through a power resistor Q19, and RC harmonic signals are generated by a resistor R9, a resistor R10 and a capacitor C3 and are provided for subsequent circuits to be processed.
The detection circuit receives signals through a MOS tube Q8, a MOS tube Q9 and a MOS tube Q13, the initial potential of a main circuit is low level, at the moment, the MOS tube Q13 is cut off, the MOS tube Q8 is conducted, the potential of the MOS tube Q9 is raised, the MOS tube Q13 is conducted, current is extracted from a current mirror to the main circuit part, the electrifying speed is accelerated, the grid potential of the Q13 is raised along with the electrifying process, the MOS tube Q13 is turned on, when the MOS tube Q13 is turned on, the MOS tube Q9 is turned off, the input circuit is isolated from the following core circuit, the main structure of the band-gap reference voltage source detection circuit is a current summation structure, and the current mirrors (Q7, Q3 and Q4) built by using P-type MOS tubes and the current mirrors (Q10 and Q11) built by NMOS tubes are used in the circuit to realize that the currents of branches where a triode Q16 and a triode Q18 are equal and provide voltage with the same magnitude for collectors of the branches. In order to ensure that the transistors have completely different current densities and voltage differences which are positively correlated with the temperature changes, the current-to-voltage conversion process is completed through the transistors Q16 and Q18 and by using the resistor R4, and the resistor R5 and the resistor R6 are equal. The right half part is a detection signal enhancement circuit, and the voltage stabilizing circuit is a negative feedback loop consisting of a feedback network and an amplifier and is mainly responsible for providing stable voltage for the main circuit. Wherein the main body of the feedback network is the detection core circuit. The amplifier mainly comprises PMOS tubes (Q5 and Q6) and NMOS tubes (Q17, Q14 and Q12), and the capacitor C1 is used for compensating the circuit. Finally, the detection signal is output after passing through a MOS tube Q1 and a MOS tube Q15.
The output stabilizing circuit provides a stable and slowly-raised voltage output, ensures the stable output of the circuit and ensures the safety of devices. When the input signal is high level, the MOS tube Q27 is conducted, the triode Q21 is cut off, the output is low level, when the input signal is low level, the MOS tube Q27 is closed, the triode Q20 charges the Q22, the potential of the Q22 rises slowly, and the Q24 and the Q21 form level shift and have the function of avoiding a weak inversion region of the MOS tube. The design core is that a slowly rising reference voltage VRMP is generated under the condition of a normal power-on process, and stable signal output is ensured.
The scaffold safety detection system attaches a plurality of same patch circuits to positions of the scaffold which are easy to deform through a monitoring scheme of the patch circuits and the detection circuit, and then regularly uses the detection circuit (device) to patrol each patch circuit point to obtain deformation and carry out safety detection, thereby realizing scaffold safety early warning.
(III) advantageous effects
According to the scaffold safety detection system, firstly, the flexible circuit board is introduced, so that the inclusiveness of ground flatness, inclination angle and the like is greatly improved; secondly, the edge pressing sensor is used as a signal receiving end, so that the detection precision is improved, and the circuit structure is simplified. Finally, a detection circuit is designed to further analyze the received signals, and the accuracy of the output of the equipment is improved.
Drawings
Fig. 1 is a prior art current sensing circuit.
Fig. 2 is a prior art voltage change sensor circuit.
Fig. 3 is a patch circuit of the present design.
Fig. 4 shows a detection circuit of the present design.
Fig. 5 shows an output stabilization circuit of the present design.
Detailed Description
The present invention is further illustrated by the following examples.
As shown in fig. 3, 4, and 5, for the present application, a scaffold safety detection system is proposed, which includes a patch circuit, a detection circuit, and an output stabilization circuit, which are connected in sequence.
The patch circuit detects signals through a passive strain device CB1, the signals enter an inverting end of an amplifier U1A after passing through an inductor L1, a diode D1 plays a voltage clamping role, a capacitor C2 and a resistor R8 play a RC filtering role, the strain signals are monitored after passing through the amplifier U1A, the output signals are fed back to a same-phase end of the amplifier U1A after being divided by a MOS tube Q19, a resistor R9 and a resistor R10, the output voltage depends on the ratio of a feedback resistor R9 to reference voltage, the adjustment rate of the output voltage is determined by the bandwidth of an error amplifier, collected signals are output after being filtered by a capacitor C3, the signals increase the output power of the signals through a power resistor Q19, and RC harmonic signals are generated by a resistor R9, a resistor R10 and a capacitor C3 and are provided for subsequent circuits to be processed.
Specifically, the patch circuit comprises an INPUT port INPUT, an output port Va, a patch edge sensor CB1, a diode D1, an amplifier U1A, a MOS tube Q19, a capacitor C2, a capacitor C3, a resistor R8, a resistor R9, a resistor R10 and an inductor L1, wherein one end of the patch edge sensor in the patch circuit is connected with the INPUT port INPUT, the other end of the patch edge sensor in the patch circuit is respectively connected with one end of the inductor L1 and the negative electrode of the diode D1, the other end of the inductor L1 is respectively connected with one end of the capacitor C2, one end of the resistor R8 and a No. 2 interface of the amplifier U1A, the other end of the capacitor C2 is grounded, the other end of the resistor R8 is grounded, the positive electrode of the diode D1 is grounded, a No. 8 interface of the amplifier U1A is grounded, a No. 4 interface of the amplifier U1A is connected with a MOS tube Q9, an interface 1 of the amplifier U1A is connected with a gate of the MOS tube Q19, a drain terminal of the MOS tube Q19 is connected with a drain terminal of the MOS tube Q9 and a drain terminal of the capacitor C3, The output port Va is connected, the other end of the capacitor C3 is grounded, the other end of the resistor R9 is connected with one end of the resistor R10 and the interface No. 3 of the amplifier U1A, the other end of the resistor R10 is grounded, and the interface No. 8 of the amplifier U1A is connected with the high-level VCC.
The detection circuit receives signals through a MOS tube Q8, a MOS tube Q9 and a MOS tube Q13, the initial potential of a main circuit is low level, at the moment, the MOS tube Q13 is cut off, the MOS tube Q8 is conducted, the potential of the MOS tube Q9 is raised, the MOS tube Q13 is conducted, current is extracted from a current mirror to the main circuit part, the electrifying speed is accelerated, the grid potential of the Q13 is raised along with the electrifying process, the MOS tube Q13 is turned on, when the MOS tube Q13 is turned on, the MOS tube Q9 is turned off, the input circuit is isolated from the following core circuit, the main structure of the band-gap reference voltage source detection circuit is a current summation structure, and the current mirrors (Q7, Q3 and Q4) built by using P-type MOS tubes and the current mirrors (Q10 and Q11) built by NMOS tubes are used in the circuit to realize that the currents of branches where a triode Q16 and a triode Q18 are equal and provide voltage with the same magnitude for collectors of the branches. In order to ensure that the triodes have completely different current densities and voltage differences which are positively correlated with the temperature changes, the current-to-voltage conversion process is completed through the transistors Q16 and Q18 and by using the resistor R4, and the resistor R5 and the resistor R6 are equal. The right half part is a detection signal enhancement circuit, and the voltage stabilizing circuit is a negative feedback loop consisting of a feedback network and an amplifier and is mainly responsible for providing stable voltage for the main circuit. Wherein the main body of the feedback network is the detection core circuit. The amplifier mainly comprises PMOS tubes (Q5 and Q6) and NMOS tubes (Q17, Q14 and Q12), and the capacitor C1 is used for compensating the circuit. Finally, the detection signal is output after passing through a MOS tube Q1 and a MOS tube Q15.
Specifically, the detection circuit includes an input port Vb, an output port Vc, transistors Q8, Q9, Q13, Q6, Q12, Q14, Q17, Q15, Q2, Q1, a capacitor C1, resistors R1, R2, R3, wherein the output port Vb is connected to the drain terminal of the transistor Q8, the drain terminal of the transistor Q13, and the gate of the transistor Q9, the source terminal of the transistor Q8 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the source terminal of the transistor Q9, the gate of the transistor Q8 is grounded, the source terminal of the transistor Q13 is connected to one end of the resistor R3, the other end of the resistor R3 is grounded, the drain terminal of the transistor Q4 is connected to the gate of the transistor Q9, the drain terminal of the transistor Q9 is connected to the high level, the drain terminal of the transistor Q9 is connected to the drain terminal of the transistor Q9, and the drain terminal of the transistor Q9 is connected to the drain terminal of the high level, the grid of the MOS transistor Q2 is connected with the grid of the MOS transistor Q1, one end of a capacitor C1 is connected with the drain of the MOS transistor Q6, the other end of the capacitor C1 is connected with the drain of the MOS transistor Q2, the source end of the MOS transistor Q12 is grounded, the drain of the MOS transistor Q1 is respectively connected with the drain of the MOS transistor Q15 and the output port Vc, and the source end of the MOS transistor Q15 is grounded. The detection circuit comprises MOS tubes Q13, Q15, Q12, Q9, Q3, Q4, Q5, Q7, Q10, Q11, Q16, Q18 and Q18, triodes Q18 and Q18, resistors R18, R18 and R18, wherein the source ends of the MOS tubes Q18, Q18 and Q18 are all connected with a high-level VCC, the grid of the MOS tube Q18 is respectively connected with the grid of the MOS tube Q18, the drain end of the MOS tube Q18 and the drain end of the MOS tube Q18, the drain end of the MOS tube Q18 is respectively connected with the drain end of the MOS tube Q18, the base of the MOS tube Q18 is respectively connected with one end of the resistor R18 and the drain end of the resistor Q18, the drain end of the resistor 18, the drain end of the collector end of the resistor 18 is connected with the triode 18, and the collector end of the transistor Q18 is connected with the ground, and the emitter of the transistor Q18 is connected with the transistor Q18, and the collector of the emitter of the transistor is connected with the transistor with the ground, and the transistor is connected with the transistor 18, and the transistor Q18, and the emitter of the transistor is connected with the transistor Q18, and the transistor with the transistor is connected with the collector of the transistor with the transistor 18, and the collector of the transistor 18, and the transistor is connected with the transistor 18, and the transistor Q18, and the transistor is connected with the transistor with the ground, One end of the resistor R6 is connected, the other end of the resistor R6 is grounded, the gate of the MOS transistor Q10 is respectively connected with the gate of the MOS transistor Q11, the drain of the MOS transistor Q9 and the gate of the MOS transistor Q6, the drain of the MOS transistor Q4 is respectively connected with one end of the resistor R7 and the gate of the MOS transistor Q13, the other end of the resistor R7 is grounded, the drain of the MOS transistor Q5 is respectively connected with the drain of the MOS transistor Q17, the gate of the MOS transistor Q14, the gate of the MOS transistor Q17 and the gate of the MOS transistor Q15, the source of the MOS transistor Q17 is grounded, the source of the MOS transistor Q14 is grounded, and the drain of the MOS transistor Q14 is connected with the gate of the MOS transistor Q12.
The output stabilizing circuit provides a stable and slowly-raised voltage output, ensures the stable output of the circuit and ensures the safety of devices. When the input signal is high level, the MOS tube Q27 is conducted, the triode Q21 is cut off, the output is low level, when the input signal is low level, the MOS tube Q27 is closed, the triode Q20 charges the Q22, the potential of the Q22 rises slowly, and the Q24 and the Q21 form level shift and have the function of avoiding a weak inversion region of the MOS tube. The design core is that a slowly rising reference voltage VRMP is generated under the condition of a normal power-on process, and stable signal output is ensured.
Specifically, the output stabilizing circuit includes a diode D2, MOS transistors Q23, Q26, triodes Q22, Q20, a capacitor C4, and a resistor R11, a drain terminal of the MOS transistor Q23 in the output stabilizing circuit is connected to a high level VCC, an anode of the diode D2 is connected to the high level VCC, a cathode of the diode D2 is connected to a gate of the MOS transistor Q23 and a gate of the MOS transistor Q26, a source terminal of the MOS transistor Q23 is connected to ground, a source terminal of the MOS transistor Q26 is connected to ground, a drain terminal of the MOS transistor Q26 is connected to a collector of the triode Q22, an emitter of the triode Q22 is connected to the high level VCC, a base of the triode Q20 is connected to a base of the triode Q22, a collector of the triode Q20 is connected to one end of the resistor R11 and one end of the capacitor C4, the other end of the resistor R11 is connected to ground, and the other end of the capacitor C4 is connected to ground. The output stabilizing circuit comprises an input port Vc, an output port Vout, a diode D2, MOS tubes Q27, Q24 and triodes Q21 and Q28, wherein the input port Vc in the output stabilizing circuit is respectively connected with a grid electrode of an MOS tube Q27 and a base electrode of the triode Q28, a source end of the MOS tube Q27 is grounded, a drain end of the MOS tube Q27 is connected with a base electrode of the triode Q21, a collector electrode of the triode Q21 is connected with a high-level VCC, an emitter electrode of the triode Q21 is respectively connected with a drain end of the MOS tube Q24 and a collector electrode of the triode Q28, a grid electrode of the MOS tube Q24 is connected with a negative electrode of the diode D2, a source end of the MOS tube Q24 is grounded, an emitter electrode of the triode Q28 is grounded, and the output port Vout is connected with a drain end of the MOS tube Q24.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The utility model provides a scaffold frame safety inspection system, is including the paster circuit, detection circuitry and the output stabilization circuit that connect gradually, its characterized in that: the patch circuit comprises an INPUT port INPUT, an output port Va, a patch edge pressing sensor CB1, a diode D1, an amplifier U1A, a MOS tube Q19, a capacitor C2, a capacitor C3, a resistor R8, a resistor R9, a resistor R10 and an inductor L1, wherein one end of the patch edge pressing sensor in the patch circuit is connected with the INPUT port INPUT, the other end of the patch edge pressing sensor in the patch circuit is respectively connected with one end of the inductor L1 and the negative electrode of the diode D1, the other end of the inductor L1 is respectively connected with one end of the capacitor C2, one end of the resistor R8 and a No. 2 interface of the amplifier U1A, the other end of the capacitor C2 is grounded, the other end of the resistor R8 is grounded, the positive electrode of the diode D1 is grounded, a No. 8 interface of the amplifier U1 1 is grounded, a No. 4 interface of the source end of the amplifier U1 1 is connected with a grid of the MOS tube Q1, a drain end of the MOS tube Q1 is respectively connected with one end of the output port Va and one end of the capacitor C1 of the resistor R1, the other end of the capacitor C3 is grounded, the other end of the resistor R9 is connected to one end of the resistor R10 and the interface No. 3 of the amplifier U1A, the other end of the resistor R10 is grounded, and the interface No. 8 of the amplifier U1A is connected to the high-level VCC.
2. The scaffold safety detection system of claim 1, wherein: the detection circuit comprises an input port Vb, an output port Vc, MOS tubes Q8, Q9, Q13, Q6, Q12, Q14, Q17, Q15, Q2 and Q1, a capacitor C1, resistors R1, R2 and R3, wherein the output port Vb of the detection circuit is respectively connected with the drain terminal of the MOS tube Q8, the drain terminal of the MOS tube Q13 and the gate of the MOS tube Q9, the source terminal of the MOS tube Q8 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the source terminal of the MOS tube Q9, the gate of the MOS tube Q8 is grounded, the source terminal of the MOS tube Q13 is connected with one end of the source terminal R3, the other end of the resistor R3 is grounded, the drain terminal of the MOS tube Q9 is connected with the gate of the MOS tube Q9, the drain terminal of the MOS tube Q9 is connected with a high level VCC, the drain terminal of the MOS tube Q9 is connected with the drain terminal of the MOS tube Q9, and the drain terminal of the MOS tube Q9 is connected with the drain terminal of the MOS tube Q9, the grid of the MOS transistor Q2 is connected with the grid of the MOS transistor Q1, one end of a capacitor C1 is connected with the drain of the MOS transistor Q6, the other end of the capacitor C1 is connected with the drain of the MOS transistor Q2, the source end of the MOS transistor Q12 is grounded, the drain of the MOS transistor Q1 is respectively connected with the drain of the MOS transistor Q15 and the output port Vc, and the source end of the MOS transistor Q15 is grounded.
3. A scaffold safety inspection system according to claim 2, wherein: the detection circuit comprises MOS tubes Q3, Q4, Q5, Q7, Q10, Q11, Q14 and Q17, triodes Q16 and Q18, and resistors R4, R5, R6 and R7, wherein the source ends of the MOS tubes Q7, Q3, Q4 and Q5 are all connected with a high-level VCC, the grid of the MOS tube Q7 is respectively connected with the grid of the MOS tube Q3, the grid of the MOS tube Q4, the grid of the MOS tube Q5, the drain end of the MOS tube Q5 and the drain end of the MOS tube Q5, the drain end of the MOS tube Q5 is respectively connected with the drain end of the MOS tube Q5, the source end of the MOS tube Q5 is respectively connected with one end of the resistor R5 and the emitter of the triode Q5, the base of the other end of the resistor R5 is grounded, the collector of the triode Q5 is connected with the base of the triode Q5, the collector of the resistor 5 is connected with the emitter of the triode Q5, and the collector of the resistor R5 is connected with the emitter of the triode 5, the other end of the resistor R6 is grounded, the gate of the MOS transistor Q10 is connected with the gate of the MOS transistor Q11, the drain of the MOS transistor Q9 and the gate of the MOS transistor Q6 respectively, the drain of the MOS transistor Q4 is connected with one end of the resistor R7 and the gate of the MOS transistor Q13 respectively, the other end of the resistor R7 is grounded, the drain of the MOS transistor Q5 is connected with the drain of the MOS transistor Q17, the gate of the MOS transistor Q14, the gate of the MOS transistor Q17 and the gate of the MOS transistor Q15 respectively, the source of the MOS transistor Q17 is grounded, the source of the MOS transistor Q14 is grounded, and the drain of the MOS transistor Q14 is connected with the gate of the MOS transistor Q12.
4. The scaffold safety detection system of claim 1, wherein: the output stabilizing circuit comprises a diode D2, MOS tubes Q23 and Q26, triodes Q22 and Q20, a capacitor C4 and a resistor R11, wherein a drain terminal of the MOS tube Q23 in the output stabilizing circuit is connected with a high level VCC, an anode of the diode D2 is connected with the high level VCC, a cathode of the diode D2 is respectively connected with a grid electrode of the MOS tube Q23 and a grid electrode of the MOS tube Q26, a source terminal of the MOS tube Q23 is grounded, a source terminal of the MOS tube Q26 is grounded, a drain terminal of the MOS tube Q26 is connected with a collector of the triode Q22, an emitter of the triode Q22 is connected with the high level VCC, a base of the triode Q20 is connected with a base of the triode Q22, a collector of the triode Q20 is respectively connected with one end of the resistor R11 and one end of the capacitor C4, the other end of the resistor R11 is grounded, and the other end of the capacitor C4 is grounded.
5. The scaffold safety detection system of claim 4, wherein: the output stabilizing circuit comprises an input port Vc, an output port Vout, MOS tubes Q27 and Q24, triodes Q21 and Q28, wherein the input port Vc in the output stabilizing circuit is respectively connected with a grid electrode of an MOS tube Q27 and a base electrode of a triode Q28, a source end of the MOS tube Q27 is grounded, a drain end of the MOS tube Q27 is connected with the base electrode of the triode Q21, a collector electrode of the triode Q21 is connected with a high-level VCC, an emitter electrode of the triode Q21 is respectively connected with a drain end of an MOS tube Q24 and a collector electrode of a triode Q28, a grid electrode of the MOS tube Q24 is connected with a negative electrode of a diode D2, a source end of the MOS tube Q24 is grounded, an emitter electrode of the triode Q28 is grounded, and the output port Vout is connected with a drain end of the MOS tube Q24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344729.5A CN114675700B (en) | 2022-04-02 | Scaffold safety detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344729.5A CN114675700B (en) | 2022-04-02 | Scaffold safety detection system |
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| CN114675700A true CN114675700A (en) | 2022-06-28 |
| CN114675700B CN114675700B (en) | 2024-06-07 |
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| CN110793426A (en) * | 2019-11-06 | 2020-02-14 | 中交一公局第八工程有限公司 | Scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals |
| CN210536530U (en) * | 2019-11-19 | 2020-05-15 | 太仓市同维电子有限公司 | Voltage output stabilizing circuit based on NMOS (N-channel metal oxide semiconductor) tube |
| CN210719009U (en) * | 2019-11-29 | 2020-06-09 | 中冶建筑研究总院（上海）有限公司 | System for monitoring structural cracks by adopting conductive patches |
| CN113849029A (en) * | 2021-09-26 | 2021-12-28 | 电子科技大学 | Under-voltage detection circuit of self-biased reference source |
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