1. A steel strip broken wire detection method is characterized by comprising the following steps: the method comprises the steps of generating an impedance electric signal in the steel strip, then obtaining the impedance electric signal from the steel strip, and judging the broken wire condition of the steel strip according to the impedance electric signal.

2. The steel strip breakage detecting system using the steel strip breakage detecting method according to claim 1, characterized by comprising an impedance generating device for generating an impedance electric signal in the steel strip; and the impedance detection device is used for acquiring an impedance electric signal from the steel strip and judging the broken wire condition of the steel strip according to the impedance electric signal.

3. The steel belt wire breakage detection system according to claim 2, wherein the impedance generating device comprises a short connector, the short connector is connected with a traction steel belt head of the elevator, the traction steel belt of the elevator comprises a plurality of steel cores, the short connector comprises a frequency generator, the frequency generator generates a signal to excite an external complex impedance electric signal and load the external complex impedance electric signal on the traction steel belt of the elevator, and the impedance detecting device obtains the impedance electric signal from the traction steel belt of the elevator to judge the steel belt wire breakage condition according to the impedance electric signal.

4. The steel strip wire breakage detection system as claimed in claim 2, wherein the impedance detection device comprises a steel strip detection circuit and an AD5933 impedance converter, the steel strip detection circuit is electrically connected with the AD5933 impedance converter, the AD5933 impedance converter is used for obtaining an impedance electric signal from a traction steel strip of the elevator, the steel strip detection circuit is used for judging the steel strip wire breakage condition according to the impedance electric signal, the steel strip detection circuit adopts an RF-IV radio frequency current-voltage impedance measurement method to collect impedance data, the AD5933 impedance converter comprises a DSP chip, the DSP chip carries out discrete Fourier transformation processing on the impedance data, the discrete Fourier transformation processing returns a real part (R) data word and an imaginary part (I) data word at each frequency, and then gain coefficient calibration is carried out on the scanned impedance amplitude and relative phase of each frequency point, calculating an impedance value; the steel belt detection circuit is provided with a self-learning function, the self-learning function provides the judgment of the initial measured resistance value and the over-limit value of +/-10% of the steel belt steel core, and in the normal detection process, the real-time resistance value of the steel belt steel core is compared with the over-limit value, so that whether the steel belt reaches the early warning and alarming limit of the steel belt is judged.

5. The steel strip broken wire detection system of claim 4, wherein the steel strip detection circuit comprises a data processing system, a power circuit, a communication circuit, a relay channel switching circuit, a relay output circuit, a key and nixie tube circuit and a storage and buzzer circuit, the power circuit, the communication circuit, the relay channel switching circuit, the relay output circuit, the key and nixie tube circuit and the storage and buzzer circuit are all electrically connected with the data processing system, and the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit.

6. A steel strip broken wire detection system as claimed in claim 5, wherein the data processing system adopts an STM32F103C8T6 chip, the STM32F103C8T6 chip receives steel strip impedance information and performs data processing, the STM32F103C8T6 chip communicates with the elevator control system, and the STM32F103C8T6 chip receives external communication, debugging and fault information and reacts.

7. A steel strip breakage detection system as claimed in claim 5, wherein the power supply circuit is configured to process an externally input 24V DC power to convert the externally input 24V DC power to a stable voltage for driving equipment, and the 24V DC power is connected to the power supply circuit to generate a 5V voltage for other circuits.

8. The system as claimed in claim 5, wherein the communication circuit uses SN74HCT245PW chip as transceiver circuit to support RS485 communication circuit and RS232 communication circuit.

9. The steel strip breakage detection system of claim 5, wherein the key and nixie tube circuit comprises a three-key circuit and a three-position nixie tube circuit, the storage and buzzer circuit comprises a storage ic of a BR24T64FJ chip, and the buzzer circuit is coupled to the speaker by a triode.

Background

With the urban development and urbanization promotion in China, the elevators become an indispensable part of the life of people, and the number of the elevators in China is over seven million and is increasing continuously at present. The composite steel belt is a novel bearing and transmission part developed on the basis of the traditional steel wire rope, and the core structure of the composite steel belt is a side-by-side steel wire rope with the inner part being at equal intervals. Because the elevator using the part has higher safety factor and lighter weight, the noise and vibration in the car can be reduced, the lubrication is not needed, the service life is long, the energy conservation and the environmental protection are more and more approved by multiple users, and the market share is rapidly improved. However, in the use process of the elevator, the steel belt is stressed for a long time to change the microstructure and the residual stress of the steel rope in the steel belt, and finally, the damages such as fatigue, deformation, wire breakage and the like may occur. The existing nondestructive detection technology applied to the steel strip is very incomplete, and detection equipment based on the electromagnetic flaw detection technology in the market has the defects of high cost, complex debugging, high requirement on the working environment and the like.

Disclosure of Invention

In order to overcome the defects of the prior art, the technical scheme adopted by the invention for solving the technical problems is as follows: a steel strip wire breakage detection method comprises the steps of generating an impedance electric signal in a steel strip, then obtaining the impedance electric signal from the steel strip, and judging the wire breakage condition of the steel strip according to the impedance electric signal.

The steel strip broken wire detection system comprises an impedance generating device, a detecting device and a control device, wherein the impedance generating device is used for generating an impedance electric signal on a steel strip; and the impedance detection device is used for acquiring an impedance electric signal from the steel strip and judging the broken wire condition of the steel strip according to the impedance electric signal.

Further, the impedance generating device comprises a short connector, the short connector is connected with a traction steel belt head of the elevator, the traction steel belt of the elevator comprises a plurality of steel cores, the short connector comprises a frequency generator, the frequency generator generates signals to excite external complex impedance electric signals and load the external complex impedance electric signals on the traction steel belt of the elevator, and the impedance detecting device obtains the impedance electric signals from the traction steel belt of the elevator to judge the broken wire condition of the steel belt according to the impedance electric signals.

Further, the impedance detection device comprises a steel belt detection circuit and an AD5933 impedance converter, the steel belt detection circuit is electrically connected with the AD5933 impedance converter, the AD5933 impedance converter is used for obtaining an impedance electric signal from a traction steel belt of the elevator, the steel belt detection circuit is used for judging the broken wire condition of the steel belt according to the impedance electric signal, the steel belt detection circuit collects impedance data by adopting an RF-IV radio frequency current-voltage impedance measuring method, the AD5933 impedance converter comprises a DSP chip, the DSP chip carries out discrete Fourier transform processing on the impedance data, the discrete Fourier transform processing returns a real part (R) data word and an imaginary part (I) data word at each frequency, then, gain coefficient calibration is carried out on the scanned impedance amplitude and relative phase of each frequency point, and the impedance value is calculated; the steel belt detection circuit is provided with a self-learning function, the self-learning function provides the judgment of the initial measured resistance value and the over-limit value of +/-10% of the steel belt steel core, and in the normal detection process, the real-time resistance value of the steel belt steel core is compared with the over-limit value, so that whether the steel belt reaches the early warning and alarming limit of the steel belt is judged.

Further, the steel belt detection circuit comprises a data processing system, a power circuit, a communication circuit, a relay channel conversion circuit, a relay output circuit, a key and nixie tube circuit and a storage and buzzer circuit, wherein the power circuit, the communication circuit, the relay channel conversion circuit, the relay output circuit, the key and nixie tube circuit and the storage and buzzer circuit are all electrically connected with the data processing system, and the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit.

Further, the data processing system adopts an STM32F103C8T6 chip, an STM32F103C8T6 chip receives steel strip impedance information and performs data processing, an STM32F103C8T6 chip communicates with an elevator control system, and an STM32F103C8T6 chip receives external communication, debugging and fault information and reacts.

Furthermore, the power supply circuit is used for processing external input 24V direct current and converting the external input 24V direct current into stable voltage for driving equipment, and after the 24V direct current is connected into the power supply circuit, the circuit generates 5V voltage for other circuits.

Furthermore, the communication circuit adopts an SN74HCT245PW chip as a transceiver circuit to support an RS485 communication circuit and an RS232 communication circuit.

Furthermore, the key and the nixie tube circuit adopt a circuit with three keys and a three-position nixie tube circuit, in the storage and buzzer circuit, the storage circuit adopts a storage ic of a BR24T64FJ chip, and the buzzer circuit adopts a triode and is coupled with a loudspeaker.

The invention has the beneficial effects that the steel belt damage information can be accurately fed back in real time based on impedance detection, the elevator safety accident caused by the steel belt damage can be effectively avoided, the cost is lower, the debugging is simple, the online detection can be incorporated into the elevator Internet of things, the detection timeliness is greatly improved, the manpower is liberated, and reliable reference is provided for future large-scale use.

Drawings

Fig. 1 is a block diagram of an impedance detection apparatus circuit according to the present application.

FIG. 2 is a schematic circuit diagram of a data processing system according to the present application.

Fig. 3 a schematic diagram of a power supply circuit in the present application.

FIG. 4 is a schematic diagram of a key and nixie tube circuit in the present application.

Fig. 5 is a schematic diagram of a communication circuit in the present application.

Figure 6 memory and buzzer circuit schematic in the present application.

Fig. 7 is a schematic diagram of a relay channel switching circuit in the present application.

Fig. 8 is a schematic diagram of a relay output circuit in the present application.

Detailed Description

In a specific implementation, the method for detecting the broken steel strip comprises the steps of generating an impedance electrical signal in the steel strip, then obtaining the impedance electrical signal from the steel strip, and judging the broken steel strip according to the impedance electrical signal.

In particular implementation, the steel band broken wire detection system of this application includes: the impedance generating device is used for generating an impedance electric signal on the steel strip; and the impedance detection device is used for acquiring an impedance electric signal from the steel strip and judging the broken wire condition of the steel strip according to the impedance electric signal.

In implementing, produce the impedance signal of telecommunication at the steel band, then, acquire the impedance signal of telecommunication from the steel band, and judge the steel band broken string condition according to the impedance signal of telecommunication, this application can accurately feed back steel band damage information in real time based on impedance detection, can effectively avoid the elevator incident because of the steel band damage produces, and the cost is lower, the debugging is simple, and can on-line measuring incorporate elevator thing networking and improve the detection timeliness greatly, the liberation manpower, for using on a large scale in the future and providing reliable reference, this application can make real-time feedback to the damage degree of steel band with the cooperation of elevator operation management system, provide reliable basis for the steel band is changed, send out the use of police dispatch and stop the elevator when the steel band damage reaches the certain degree, prevent that the incident from appearing in the elevator.

Preferably, the steel strip broken wire detection system of the present application includes: the impedance generating device is used for generating an impedance electric signal on the steel strip; and the impedance detection device is used for acquiring an impedance electric signal from the steel strip and judging the broken wire condition of the steel strip according to the impedance electric signal. The impedance generating device comprises a short connector, the short connector is connected with a traction steel belt head of the elevator, the traction steel belt of the elevator comprises a plurality of steel cores (such as 8 steel cores), the short connector comprises a frequency generator, the frequency generator generates signals to excite external complex impedance electric signals and load the external complex impedance electric signals on the traction steel belt of the elevator, and the impedance detecting device obtains the impedance electric signals from the traction steel belt of the elevator to judge the broken wire condition of the steel belt according to the impedance electric signals.

Preferably, the steel strip broken wire detection system of the present application includes: the impedance generating device is used for generating an impedance electric signal on the steel strip; and the impedance detection device is used for acquiring an impedance electric signal from the steel strip and judging the broken wire condition of the steel strip according to the impedance electric signal. As shown in fig. 1, the impedance detection device includes a steel belt detection circuit and an AD5933 impedance converter, the steel belt detection circuit is electrically connected with the AD5933 impedance converter, the AD5933 impedance converter is used for obtaining an impedance electrical signal from a traction steel belt of an elevator, the steel belt detection circuit is used for judging the broken steel belt according to the impedance electrical signal, the steel belt detection circuit collects impedance data by using an RF-IV radio frequency current-voltage impedance measurement method, the AD5933 impedance converter includes a DSP chip, the DSP chip performs discrete fourier transform processing on the impedance data, the discrete fourier transform processing returns a real part (R) data word and an imaginary part (I) data word at each frequency, and then, gain coefficient calibration is performed on the scanned impedance amplitude and relative phase of each frequency point to calculate the impedance value; the steel belt detection circuit is provided with a self-learning function, the self-learning function provides the judgment of the initial measured resistance value and the over-limit value of +/-10% of the steel belt steel core, and in the normal detection process, the real-time resistance value of the steel belt steel core is compared with the over-limit value, so that whether the steel belt reaches the early warning and alarming limit of the steel belt is judged. This application can accurately feed back steel band damage information in real time based on impedance detection, can effectively avoid the elevator incident that produces because of the steel band damage, and the cost is lower, the debugging is simple, but and on-line measuring incorporates the elevator thing networking and improves the detection ageing greatly, liberate the manpower, use for future extensive use and provide reliable reference, this application and elevator operation management system cooperation can make real-time feedback to the damage degree of steel band, change for the steel band and provide reliable foundation, send out the use of police dispatch newspaper and stop the elevator when the steel band damage reaches the certain degree, prevent that the incident from appearing in the elevator.

Preferably, as shown in fig. 1, the steel strip detection circuit includes a data processing system, a power circuit, a communication circuit, a relay channel switching circuit, a relay output circuit, a key and nixie tube circuit, and a storage and buzzer circuit, the power circuit, the communication circuit, the relay channel switching circuit, the relay output circuit, the key and nixie tube circuit, and the storage and buzzer circuit are all electrically connected to the data processing system, and the communication circuit includes an RS485 communication circuit and an RS232 communication circuit.

Preferably, the steel strip detection circuit comprises a data processing system, a power supply circuit, a communication circuit, a relay channel conversion circuit, a relay output circuit, a key and nixie tube circuit and a storage and buzzer circuit, wherein the power supply circuit, the communication circuit, the relay channel conversion circuit, the relay output circuit, the key and nixie tube circuit and the storage and buzzer circuit are all electrically connected with the data processing system, the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit, as shown in FIG. 2, the data processing system adopts an STM32F103C8T6 chip, the STM32F103C8T6 chip receives steel strip impedance information and performs data processing, the STM32F103C8T6 chip communicates with an elevator control system, and the STM32F103C8T6 chip receives external communication, debugging and fault information and makes a response. The chip adopts 8M external crystal oscillator clock with stronger interference resistance, and avoids unstable clock inside the MCU caused by working environment interference. The LED is arranged as a communication signal lamp, and a switch adjusting chip starting mode is arranged, so that equipment debugging is facilitated.

Preferably, the steel strip detection circuit comprises a data processing system, a power circuit, a communication circuit, a relay channel conversion circuit, a relay output circuit, a key and nixie tube circuit and a storage and buzzer circuit, wherein the power circuit, the communication circuit, the relay channel conversion circuit, the relay output circuit, the key and nixie tube circuit and the storage and buzzer circuit are all electrically connected with the data processing system, the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit, as shown in fig. 3, the power circuit is used for processing external 24V direct current and converting the external 24V direct current into stable voltage for driving equipment, and the circuit generates 5V voltage for other circuits after the 24V direct current is connected into the power circuit; the power circuit is also provided with electromagnetic protection, and normal power supply of the equipment is ensured under the electromagnetic interference of static electricity, high-frequency electromagnetic wave disturbance and the like in a working environment.

Preferably, the steel strip detection circuit comprises a data processing system, a power circuit, a communication circuit, a relay channel conversion circuit, a relay output circuit, a key and nixie tube circuit and a storage and buzzer circuit, wherein the power circuit, the communication circuit, the relay channel conversion circuit, the relay output circuit, the key and nixie tube circuit and the storage and buzzer circuit are all electrically connected with the data processing system, the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit, and as shown in fig. 5, an SN74HCT245PW chip is adopted as a transceiver circuit to support the RS485 communication circuit and the RS232 communication circuit.

Preferably, the steel strip detection circuit comprises a data processing system, a power circuit, a communication circuit, a relay channel conversion circuit, a relay output circuit, a key and nixie tube circuit, and a storage and buzzer circuit, wherein the power circuit, the communication circuit, the relay channel conversion circuit, the relay output circuit, the key and nixie tube circuit, and the storage and buzzer circuit are all electrically connected with the data processing system, the communication circuit comprises an RS485 communication circuit and an RS232 communication circuit, as shown in fig. 4, 6-8, the relay channel conversion circuit uses ULN2003 to convert TTL level into voltage for driving a relay, the relay output circuit is used for driving the relay through the relay output circuit after processing, and the two relays are respectively provided with a light emitting diode to prompt the state of the relay, the storage and buzzer circuit adopts the storage ic of a BR24T64FJ chip, and the buzzer circuit adopts a triode and is coupled with a loudspeaker.

In specific implementation, a unified fatigue test standard and a detection acceptance method for steel belts at home and abroad are not available, the steel belts are executed according to the regulation of a standard YB/T4288-2012 bending fatigue test for steel ropes for elevators, and finally, the passing of the test in a national elevator quality supervision and inspection center type and the formation of a report is taken as the standard.

The steel belt detection method has a self-learning function, and the self-learning operation provides the steel belt detection device with the initial measured resistance value of the steel belt steel core and the +/-10% overrun value. In the normal detection process, the real-time resistance value of the steel core of the steel belt is compared with the overrun value, so that whether the steel belt reaches the early warning and alarming limit is judged. Detection accuracy and security level classification and description, as above. The self-learning function enables the equipment to adapt to different environments, parameters do not need to be set manually, the installation and debugging operations are simple, manpower and material resources are saved, and the large-scale investment is facilitated. The steel belt detection device only carries out inspection work when the elevator stops and needs to communicate with the elevator to acquire the running state of the elevator. The inspection time can be adjusted according to the actual requirements of customers. When the detection is abnormal, a relay signal is timely output to the main controller, and the elevator performs corresponding emergency action. The device can realize 24-hour all-weather detection, and can reliably output alarm signals of relay dry nodes, buzzers, red LEDs and the like. Table 1 below illustrates the correspondence between the real-time detection rate and the security level.

TABLE 1

In the application of the short-circuit connector, the steel cores of each steel belt are connected end to end, 8 parallel independent steel cores are connected to form a single steel core, and then the resistance value of the steel core is measured by the detection circuit to judge the condition of the steel belt. The impedance detection device and the short joint are respectively arranged at the head of the dragging steel belt, so that the effective load of the dragging steel belt and the operation safety are not influenced. And then, the impedance information of the steel belt can be uploaded to the Internet of things of the elevator through WIFI, and the elevator can be correspondingly operated by communicating with the master controller. The big data can be used for establishing a model, and fault early warning and due replacement reminding can be realized.

In the overall implementation principle, the method is equivalent to connecting a plurality of, for example, 8 mutually non-conductive conductors into a conductor from the aspect of circuit analysis, and then measuring the resistance value of the conductor by a detection circuit to judge the condition of the steel strip. According to the self-learning elevator safety accident prevention method and device, the initial impedance value of the steel belt is recorded through the self-learning function, then the steel belt is detected in real time, the real-time impedance data of the steel belt is recorded and compared with the initial impedance data recorded by self-learning, the damage degree of the steel belt is judged according to the change degree, the elevator controller can make corresponding reaction by carrying out real-time communication with the elevator controller, and the elevator safety accident caused by the damage of the steel belt is avoided.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are illustrative and not exclusive in all respects. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.