CN111813023A - A static load detection device and identification method for automatic identification of displacement sensor - Google Patents

Abstract

The invention has proposed a detection device and recognition method of dead load of the automatic recognition displacement sensor, through setting up the recognition of displacement sensor and gathering the module, carry on the automatic recognition to the sensor type that inserts according to the sensor identification scheme preserved and judge, send sensor type parameter and sensor number information that discern to the embedded computer, the embedded computer reads the data through electrifying in advance, can judge the sensor type, thus does not need to choose the sensor type manually, the goal of automatic recognition; through setting up wireless transmission module, to inductance type displacement sensor, can obtain displacement sensor's calibration table parameter from the producer server automatically to automatic match with the passageway and the serial number of the sensor that inserts, need not the manual work and carry out the matching of calibration table, dead load detection device automatic update calibrates the table and carries out automatic matching.

Description

A static load detection device and identification method for automatic identification of displacement sensor

technical field

The invention relates to the technical field of geotechnical engineering detection, in particular to a static load detection device and an identification method for automatically identifying a displacement sensor.

Background technique

As a form of building foundation structure, pile foundation is buried underground and belongs to concealed engineering. Accurately determining the quality of the pile foundation project is very important to ensure the overall quality and safety of the building. According to the "Technical Specification for the Inspection of Building Pile Foundation JGJ106-2014", the main methods of pile foundation inspection include static load test, core drilling method, low strain method, High strain method, sound wave transmission method, etc. Among them, static load test usually adopts static load tester, which consists of the following parts: static load detection host, displacement sensor, oil pressure sensor, acquisition base station, oil pump controller.

At present, the displacement sensors used in static load testing are mainly divided into the following two categories: capacitive grid displacement sensors and inductive frequency modulation displacement sensors. Since these two types of displacement sensors have their own characteristics and advantages, their market share is evenly divided. Therefore, the static load detector needs to have access to these two types of sensors in terms of function.

At present, before the test of the static load detection system of each manufacturer, the testing personnel need to clarify the type of sensor connected, and then select the sensor type on the static load detection host. If the capacitive grid displacement sensor is used on site, due to its output digital The signal can be directly analyzed as the current displacement value, and no calibration conversion is required, so it is not necessary to register the sensor number of each channel in advance. If an inductive FM displacement sensor is used on site, it is necessary to select the calibration table corresponding to the FM displacement sensor connected to each channel, and it must be in one-to-one correspondence. During the process, there will be a large error in the actual displacement value, which will affect the detection quality and efficiency. Therefore, at present, in this way, before the sensor is installed and connected, it is necessary to manually record the number of the sensor connected to each channel. If it is not recorded in advance, and the access is random, it is necessary to manually go to the bottom of the stack to check the number and channel. There is a great security risk going back and forth like this. In addition, each manufacturer's static load detector needs to manually enter the calibration table corresponding to the standard inductive displacement sensor number into the static load host before leaving the factory, so as to be convenient for users to call when matching sensors. First of all It is time-consuming and labor-intensive, and there is a risk of input errors. In addition, if the user needs to replace or buy a new displacement sensor, it is usually necessary to send it back to the manufacturer for input or directly send the calibration table to the user to add it by himself. The user experience is poor, and it will also affect the construction period. . To sum up, at present, the operation and calibration mode of the sensor type selection of the static load detectors of various manufacturers puts forward relatively high requirements for the testing personnel, and is prone to errors and safety hazards.

Therefore, in order to solve the above problems, the present invention provides a static load detection device and an identification method for automatically identifying a displacement sensor, which can automatically identify the sensor type without manual selection of the sensor type, and for the inductive displacement sensor, no need to manually select the sensor type. The matching of the fixed table, the static load detection device automatically updates the fixed table and performs automatic matching.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes a static load detection device and an identification method for automatically identifying a displacement sensor, which can automatically identify the sensor type without manual selection of the sensor type, and for the inductive displacement sensor, no manual calibration is required. Matching, the static load detection device automatically updates the rate table and performs automatic matching.

The technical scheme of the present invention is achieved as follows: on the one hand, the present invention provides a static load detection device for automatically identifying a displacement sensor, including an embedded computer, a wireless transmission module, a displacement sensor, and a displacement sensor identification and acquisition module;

The displacement sensor is electrically connected to the input end of the displacement sensor identification and acquisition module, the output end of the displacement sensor identification and acquisition module is electrically connected to the I/O of the embedded computer, and the embedded computer is electrically connected to the wireless transmission module.

On the basis of the above technical solutions, preferably, the displacement sensor includes a capacitive grid displacement sensor and an inductive frequency modulation displacement sensor;

The output ends of the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor are respectively electrically connected with the input end of the displacement sensor identification and acquisition module.

On the basis of the above technical solutions, preferably, the displacement sensor identification and acquisition module includes: an external interface, a first receiving circuit, a second receiving circuit and a CPLD chip;

The capacitive grid displacement sensor and the inductive frequency modulation displacement sensor are connected with the external interface, the input end of the first receiving circuit and the input end of the second receiving circuit are respectively electrically connected with the terminals of the external interface in one-to-one correspondence, and the first receiving circuit The output end and the output end of the second receiving circuit are respectively electrically connected with the I/O ports of the CPLD chip in one-to-one correspondence, and the CPLD chip is electrically connected with the embedded computer.

Further preferably, the first receiving circuit includes a first differential-to-single-ended circuit and a second differential-to-single-ended circuit with the same structure;

The differential input terminal of the first differential-to-single-ended circuit and the differential input terminal of the second differential-to-single-ended circuit are respectively electrically connected to the four terminals of the external interface in one-to-one correspondence, and the output terminal of the first differential-to-single-ended circuit is electrically connected to The output ends of the second differential-to-single-ended circuit are respectively electrically connected to the I/O ports of the CPLD chip in a one-to-one correspondence.

Further preferably, the first differential-to-single-ended circuit includes a MAX3485ECSA receiver and a resistor R101;

The A and B pins of the MAX3485ECSA receiver are electrically connected to the two terminals of the external interface in a one-to-one correspondence. Resistor R101 is connected in parallel between the A and B pins. The RO pin of the MAX3485ECSA receiver is connected to the I/O of the CPLD. For electrical connections, the RE and DE pins of the MAX3485ECSA receiver are grounded, and the DI pin of the MAX3485ECSA receiver is left open.

Further preferably, the second receiving circuit includes: a resistor R102, a capacitor C98 and an AND gate;

One terminal of the external interface is electrically connected to the two input terminals of the AND gate, one end of the resistor R102 is connected in parallel in the line between the external interface and the AND gate, the other end of the resistor R102 is electrically connected to the power supply, and the other end of the resistor R102 is electrically connected to the power supply. One end is electrically connected to the power supply end of the AND gate, and the other end of the capacitor C98 is grounded.

On the basis of the above technical solutions, preferably, a GPS module electrically connected with the microprocessor is also included.

On the other hand, the present invention provides a method for automatically identifying a static load detection device of a displacement sensor, comprising the following steps:

S1. The static load detection device is powered on, and each module is initialized;

S2. The built-in displacement sensor identification and collection module of the static load detection device identifies and judges the type of the connected sensor according to the preset sensor identification scheme, and sends the identified sensor type parameters and sensor number information to the embedded computer;

S3. The embedded computer sends the identified sensor type parameters to the displacement sensor identification and acquisition module, and starts the displacement sensor identification and acquisition module to work;

S4. The displacement sensor identification and acquisition module selects the sensor acquisition logic of the corresponding type according to the sensor type parameters sent by the embedded computer, and transmits the collected sensor data to the embedded computer in real time;

S5. The embedded computer receives the sensor data of the displacement sensor identification and acquisition module, and combines the sensor number information transmitted by the sensor and the wireless transmission module to obtain the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically corresponds to the sensor number information. The calibration table is matched, and the current displacement value of the displacement sensor is accurately converted.

On the basis of the above technical solutions, preferably, the sensor identification solution in S2 is: if the connected sensor outputs CLK and DAT signals, the connected sensor is a capacitive grid displacement sensor;

If the connected sensor outputs FRQ signal, the connected sensor is an inductive frequency modulation displacement sensor.

Further preferably, S2 also includes: if the connected sensor is an inductive frequency modulation displacement sensor, the serial number information of the inductive frequency modulation displacement sensor is sent to the embedded computer within 5s when the inductive frequency modulation displacement sensor is connected and powered on, and then the inductive frequency modulation displacement sensor is sent to the embedded computer. Then send the current frequency value.

Compared with the prior art, the static load detection device and the identification method for automatically identifying the displacement sensor of the present invention have the following beneficial effects:

(1) By setting the displacement sensor identification and acquisition module, the type of the connected sensor is automatically identified and judged according to the preset sensor identification scheme, and the identified sensor type parameters and sensor number information are sent to the embedded computer. The sensor type can be judged by pre-reading the data after power-on, so as to achieve the purpose of automatic identification without manual selection of sensor type;

(2) By setting the sensor acquisition logic of the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor in the displacement sensor identification and acquisition module, the sensor data can be collected in real time for different types of sensors;

(3) By setting up the wireless transmission module, for the inductive displacement sensor, the calibration table parameters of the displacement sensor can be automatically obtained from the manufacturer's server, and automatically matched with the channel and number of the connected sensor, without manual calibration of the table. Matching, the static load detection device automatically updates the rate table and performs automatic matching;

(4) Send the serial number information of the inductive FM displacement sensor to the embedded computer within 5s after the inductive frequency modulation displacement sensor is connected to the power supply, and then send the current frequency value, so as to realize the time-sharing acquisition of the serial number and frequency, which greatly improves the It increases the applicability and versatility of the inductive frequency modulation displacement sensor;

(5) Set a first receiving circuit in the displacement sensor identification and acquisition module. On the one hand, when the external interface is connected to a capacitive displacement sensor, the sensor type parameters output by the capacitive displacement sensor are received through the first receiving circuit. , sensor number information and sensor data, and send the above information to the CPLD chip; on the other hand, because the capacitance grid displacement sensor outputs CLK and DATA signals, and the CLK and DATA signals become differential signals through the external interface, respectively Denoted as CLK+0, CLK-0, DATA+0 and DATA-0, in order to facilitate the identification of the sensor type according to the output signal, the first receiving circuit is set to convert the differential signals corresponding to the CLK and DATA signals into single-ended signals;

(6) Set a second receiving circuit in the displacement sensor identification and acquisition module. On the one hand, when the external interface is connected to an inductive frequency modulation displacement sensor, the sensor type parameter output by the inductive frequency modulation displacement sensor is received through the second receiving circuit. , sensor number information and sensor data, and send the above information to the CPLD chip; on the other hand, the FRQ signal output by the inductive frequency modulation displacement sensor is waveform shaped, and the CPLD chip pin is protected.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a structural diagram of a static load detection device for automatically identifying a displacement sensor of the present invention;

2 is a structural diagram of a displacement sensor identification and acquisition module in a static load detection device for automatically identifying displacement sensors according to the present invention;

3 is a circuit diagram of an external interface, a first receiving circuit and a second receiving circuit in Embodiment 2;

FIG. 4 is a schematic diagram of pin connections of the CPLD chip in Embodiment 2. FIG.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1 , a static load detection device for automatically identifying a displacement sensor of the present invention includes: an embedded computer, a wireless transmission module, a displacement sensor, a displacement sensor identification and acquisition module, and a GPS module.

Displacement sensors, including capacitive grid displacement sensors and inductive frequency modulation displacement sensors. In this embodiment, the output ends of the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor are respectively electrically connected to the input ends of the displacement sensor identification and acquisition module.

The displacement sensor identification and acquisition module automatically identifies and judges the connected sensor type according to the preset sensor identification scheme, and sends the identified sensor type parameters and sensor number information to the embedded computer, and the embedded computer pre-reads through power-on The sensor type can be judged by taking the data, so as to achieve the purpose of automatic identification without manual selection of the sensor type; according to the sensor type parameters, select the sensor acquisition logic of the corresponding type, and transmit the collected sensor data to the embedded computer in real time. In this embodiment, the preset sensor identification scheme is: if the connected sensor outputs CLK and DATA signals, the connected sensor is a capacitive grid displacement sensor; if the connected sensor outputs an FRQ signal, it is a connected sensor The sensor is an inductive frequency modulated displacement sensor. The embedded computer can judge the sensor type by pre-reading the data by power-on, so as to achieve the purpose of automatic identification.

It should be noted that the embedded computer recognizes whether the signal output by the displacement sensor is the CLK, DATA signal, or the function of the FRQ signal, which is a unique attribute of the embedded computer. This function is clear and complete to those skilled in the art. Therefore, , which will not be repeated here, the principle of the embedded computer identifying the type of signal output by the displacement sensor.

It should also be noted that the two sensor acquisition logics built into the displacement sensor identification and acquisition module belong to the technical means commonly used in the field, and the two sensor acquisition logics are commonly used in the field for capacitive grid displacement sensors and inductive frequency modulation displacement sensors. Data acquisition logic, those skilled in the art can integrate the data acquisition logic commonly used for capacitive grid displacement sensors and inductive frequency modulation displacement sensors in one chip when they know the solution described in this embodiment. It is clear and complete to the skilled person of the above, therefore, it will not be repeated here.

In this embodiment, if the access sensor is a capacitive grid displacement sensor, since its output digital signal can be directly analyzed as the current displacement value, no calibration conversion is required, so it is not necessary to register the sensor number of each channel in advance; If the sensor is an inductive FM displacement sensor, it is necessary to select the calibration table corresponding to the FM displacement sensor connected to each channel, and it must be in one-to-one correspondence. There will be a large error in the displacement value, which will affect the detection quality and efficiency. Therefore, in this embodiment, a wireless transmission module is provided, and for the inductive displacement sensor, the calibration table parameters of the displacement sensor can be automatically obtained from the manufacturer's server, and automatically matched with the channel and number of the connected sensor. The embedded computer recognizes and collects the sensor data of the module according to the received displacement sensor, and combines the number information transmitted by the sensor, without manual matching of the calibration table, and automatically matches the calibration table of the numbered sensor to accurately convert the displacement. The current displacement value of the sensor realizes the automatic update rate table and automatic matching of the static load detection device.

It should be noted that: using the wireless transmission module to obtain information from the server is a common technical means in the field, and this technology is clear and complete to those skilled in the art; For simple algorithms in the art, those skilled in the art can obtain the corresponding algorithms and principle data without any doubts when they know the contents described in this embodiment, and therefore, they are not repeated here.

The embedded computer is used to receive the access sensor type parameters and sensor number information transmitted by the displacement sensor identification and acquisition module, send the identified sensor type parameters to the data acquisition module, and start the data acquisition module; The sensor data, combined with the sensor number information transmitted by the displacement sensor, and the wireless transmission module obtains the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically matches the calibration table of the sensor corresponding to the sensor number information to accurately convert the displacement sensor. The current displacement value. Among them, if the connected sensor is a capacitive displacement sensor, only the sensor type parameters need to be transmitted, and the sensor number information does not need to be transmitted to the embedded computer; if the connected sensor is an inductive frequency modulation displacement sensor, the sensor type needs to be transmitted. Parameter and sensor number information is sent to the embedded computer.

It should be noted that the embedded computer combines the sensor data output by the data acquisition module, the sensor number information transmitted by the displacement sensor, and the wireless transmission module to obtain the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically corresponds to the sensor number information. Set the table to match, and accurately convert the current displacement value of the displacement sensor. This function belongs to a simple algorithm in the field. When those skilled in the art know the content recorded in this embodiment, they can obtain the corresponding algorithm and algorithm without any doubt. The principle information, therefore, will not be repeated here.

GPS module for accurate static load tester location.

Preferably, in this embodiment, a liquid crystal display screen and a power supply circuit are also included. The power supply circuit supplies power to each module; the liquid crystal display screen is connected with the embedded computer through the LVDS bus.

The working principle of this embodiment is as follows: the displacement sensor identification and acquisition module identifies and judges the type of the connected displacement sensor, sends the identified sensor type parameters and sensor number information to the embedded computer, and the embedded computer sends the identified sensor The type parameters are sent to the displacement sensor identification and acquisition module. The displacement sensor identification and acquisition module selects the corresponding type of sensor acquisition logic according to the sensor type parameters sent by the embedded computer, and transmits the collected sensor data to the embedded computer in real time. The embedded computer receives the sensor data of the displacement sensor identification and acquisition module, and combines the sensor number information transmitted by the sensor and the wireless transmission module to obtain the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically corresponds to the sensor number information. Set the table to match, and accurately convert the current displacement value of the displacement sensor.

The beneficial effects of this embodiment are: by setting the displacement sensor identification and collection module, the type of the connected sensor is automatically identified and judged according to the preset sensor identification scheme, and the identified sensor type parameters and sensor number information are sent to the embedded The computer and embedded computer can judge the sensor type by pre-reading the data after power-on, so as to achieve the purpose of automatic identification without manual selection of the sensor type;

By setting the sensor acquisition logic of the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor in the displacement sensor identification and acquisition module, the sensor data can be collected in real time for different types of sensors;

By setting the wireless transmission module, for the inductive displacement sensor, the calibration table parameters of the displacement sensor can be automatically obtained from the manufacturer's server, and automatically matched with the channel and number of the connected sensor, without manual matching of the calibration table. The load detection device automatically updates the rate setting table and performs automatic matching.

Example 2

Further preferably, in this embodiment, a specific embodiment of the displacement sensor identification and collection module is provided. In this embodiment, as shown in FIG. 2 , the displacement sensor identification and acquisition module includes: an external interface, a first receiving circuit, a second receiving circuit and a CPLD chip, wherein the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor are connected to the external interface. The interface is connected, the input end of the first receiving circuit and the input end of the second receiving circuit are respectively electrically connected with the connection terminals of the external interface in a one-to-one correspondence, and the output end of the first receiving circuit and the output end of the second receiving circuit are respectively connected with the CPLD The I/O ports of the chip are electrically connected one by one, and the CPLD chip is electrically connected to the embedded computer.

External interface for connecting capacitive grid displacement sensor or inductive frequency modulation displacement sensor. In practical application, the displacement sensor is selected to be connected to the external interface in this embodiment according to the practical application. In this embodiment, the external interface adopts the XH2P54-7P socket, which has 7 pins.

The first receiving circuit, on the one hand, when the external interface is connected to a capacitive displacement sensor, receives the sensor type parameters, sensor number information and sensor data output by the capacitive displacement sensor through the first receiving circuit, and transmits the above information. It is sent to the CPLD chip; on the other hand, since the capacitive displacement sensor outputs the CLK and DAT signals, and the CLK and DATA signals become differential signals through the external interface, they are respectively recorded as CLK+0, CLK-0, DATA+ 0 and DATA-0, in order to facilitate the identification of the sensor type according to the output signal, in this embodiment, a first receiving circuit is set to convert the differential signals corresponding to the CLK and DATA signals into single-ended signals.

Preferably, in this embodiment, the first receiving circuit includes a first differential-to-single-ended circuit and a second differential-to-single-ended circuit with the same structure; specifically, the differential input terminal of the first differential-to-single-ended circuit and the second differential The differential input terminals of the conversion to single-ended circuit are respectively electrically connected with the four terminals of the external interface in one-to-one correspondence. The I/O ports are electrically connected one by one. Since the structures of the first differential-to-single-ended circuit and the second differential-to-single-ended circuit are the same, the difference is that the first differential-to-single-ended circuit converts CLK+0 and CLK-0 into CLK single-ended signals, and the first differential to single-ended The circuit converts DATA+0 and DATA-0 into DATA single-ended signals. Therefore, only the structure and principle of the first differential-to-single-ended circuit are introduced here.

As shown in FIG. 3 , the first differential-to-single-ended circuit converts CLK+0 and CLK-0 into CLK single-ended signals. In this embodiment, as shown in the figure, the first differential-to-single-ended circuit includes a MAX3485ECSA receiver and a resistor R101; specifically, the A and B pins of the MAX3485ECSA receiver are in one-to-one correspondence with the two terminals of the external interface. The resistor R101 is connected in parallel between the A and B pins, the RO pin of the MAX3485ECSA receiver is electrically connected to the I/O port of the CPLD, the RE and DE pins of the MAX3485ECSA receiver are grounded, and the DI pin of the MAX3485ECSA receiver is grounded. Feet dangling.

The second receiving circuit, on the one hand, when the external interface is connected to an inductive frequency modulation displacement sensor, the second receiving circuit receives the sensor type parameters, sensor number information and sensor data output by the inductive frequency modulation displacement sensor, and transmits the above information. Send it to the CPLD chip; on the other hand, perform waveform shaping on the FRQ signal output by the inductive frequency modulation displacement sensor, and protect the pins of the CPLD chip. In this embodiment, as shown in FIG. 3 , the FRQ signal output by the inductive frequency modulation displacement sensor is represented by DIS_L_CLK0, and the second receiving circuit includes: a resistor R102, a capacitor C98 and an AND gate; The two input terminals of the AND gate are electrically connected, one end of the resistor R102 is connected in parallel with the line between the external interface and the AND gate, the other end of the resistor R102 is electrically connected to the power supply, and one end of the capacitor C98 is electrically connected to the power supply terminal of the AND gate. The other end of the capacitor C98 is grounded. Among them, the capacitor C98 is used to filter the power supply connected to the AND gate; the resistor R102 is used to decouple the power supply connected to the external interface; the FRQ signal output by the inductive frequency modulation displacement sensor is waveform shaped through the AND gate.

The CPLD chip is used to receive the CLK and DATA signals output by the first receiving circuit and the FRQ signal output by the second receiving circuit, and send the connected sensor type parameters and sensor number information to the embedded computer through the UART serial port; receive the first The sensor data sent by the first receiving circuit and the second receiving circuit are sent to the embedded computer through the GPMC bus. In this embodiment, the model of the CPLD chip is not limited. Preferably, the ALTERAEPM1270T144 chip is selected as the CPLD chip in this embodiment, and the connection relationship between it and other components is shown in FIG. 4 .

The working principle of the displacement sensor identification and acquisition module in this embodiment is as follows: when the external interface is connected to a capacitive displacement sensor, the CLK and DAT signals output by the capacitive displacement sensor become differential signals after passing through the external interface. Denoted as CLK+0, CLK-0, DATA+0 and DATA-0 respectively, the CLK+0 and CLK-0 signals are converted into CLK single-ended signals through the first differential to single-ended circuit; DATA+0 and DATA-0 signals After the second differential to single-ended circuit is converted into a DATA single-ended signal, the converted CLK single-ended signal and DATA single-ended signal are respectively input to the CPLD chip, and transmitted to the embedded computer through the URAT port of the CPLD chip. It is known that the type of access sensor is a capacitive grid displacement sensor;

When the external interface is connected to an inductive frequency modulation displacement sensor, the FRQ signal output by the inductive frequency modulation displacement sensor, the FRQ signal is wave-shaped by the second receiving circuit and then transmitted to the CPLD chip, and transmitted to the embedded chip through the URAT port of the CPLD chip. The embedded computer knows that the type of the connected sensor is an inductive frequency-modulated displacement sensor.

The beneficial effect of this embodiment is that: a first receiving circuit is provided. On the one hand, when a capacitive displacement sensor is connected to the external interface, the sensor type parameters and sensor number output by the capacitive displacement sensor are received through the first receiving circuit. information and sensor data, and send the above information to the CPLD chip; on the other hand, because the capacitive displacement sensor outputs CLK and DATA signals, and the CLK and DATA signals become differential signals through the external interface, they are respectively recorded as CLK. +0, CLK-0, DATA+0 and DATA-0, in order to facilitate the identification of the sensor type according to the output signal, the first receiving circuit is set to convert the differential signals corresponding to the CLK and DATA signals into single-ended signals;

Set up a second receiving circuit. On the one hand, when the external interface is connected to an inductive frequency modulation displacement sensor, the sensor type parameters, sensor number information and sensor data output by the inductive frequency modulation displacement sensor are received through the second receiving circuit, and the above The information is sent to the CPLD chip; on the other hand, the FRQ signal output by the inductive frequency modulation displacement sensor is waveform shaped, and the pins of the CPLD chip are protected.

Example 3

On the basis of Embodiment 1, this embodiment provides a method for improving the efficiency of identifying sensor types and reducing the processing threads of an embedded computer. Since the output digital signal of the capacitance grid displacement sensor can be directly analyzed as the current displacement value, no calibration conversion is required, therefore, this embodiment is based on the improvement made by the access sensor for the inductive frequency modulation displacement sensor.

Usually, in order to realize the function of reading and configuring the number information of various sensors, the commonly used technical means is to add an MCU processing module in the internal structure space of the sensor or outside to realize the function of command interaction with the embedded computer. For example, the interface function of RS485 is realized, and related communication protocols such as Modbus are used to realize the reading and configuration functions of sensor number information by interacting with the embedded computer command line. It can be seen that this technical means changes the form of the sensor lead wire and increases the cost; in addition, the use of RS485 will reduce the output frequency of the inductive frequency modulation displacement sensor data, and the change of the interface method will inevitably lead to the application of the inductive frequency modulation displacement sensor. Reduced versatility and versatility.

Therefore, in order to solve the above problems, in this embodiment, the sensor number information of the inductive frequency modulation displacement sensor is sent to the displacement sensor identification and collection module within 5s after the inductive frequency modulation displacement sensor is connected to the power supply, and the displacement sensor identifies and collects the information. After the module is parsed and processed, it is cached for the embedded computer to obtain on demand, and then the current frequency value is sent, so as to realize the time-sharing acquisition of the number and frequency, which greatly increases the applicability and versatility of the inductive frequency modulation displacement sensor, reduces the The processing thread of the embedded computer and the inductive frequency modulation displacement sensor is used to reduce the load of the embedded computer, thereby improving the recognition efficiency of the sensor type and the reading rate of the sensor data.

Example 4

On the basis of Embodiment 1, this embodiment provides an identification method for automatically identifying a static load detection device of a displacement sensor, which specifically includes the following steps:

S1. The static load detection device is powered on, and each module is initialized;

S2. The built-in displacement sensor identification and acquisition module of the static load detection device identifies and judges the type of the connected displacement sensor according to the preset sensor identification scheme, and sends the identified sensor type parameters and sensor number information to the embedded computer;

The preset sensor identification scheme is: if the connected sensor outputs CLK and DATA signals, the connected sensor is a capacitive displacement sensor; if the connected sensor outputs FRQ signal, the connected sensor is an inductance FM displacement sensor.

If the connected sensor is an inductive frequency modulation displacement sensor, the serial number information of the inductive frequency modulation displacement sensor is sent to the embedded computer within 5s after the inductive frequency modulation displacement sensor is connected to power-on, and then the current frequency value is sent to realize The time-sharing acquisition of number and frequency greatly increases the applicability and versatility of the inductive frequency-modulated displacement sensor.

S3. The embedded computer sends the identified sensor type parameters to the displacement sensor identification and acquisition module, and starts the displacement sensor identification and acquisition module to work;

S4. The displacement sensor identification and acquisition module selects the sensor acquisition logic of the corresponding type according to the sensor type parameters sent by the embedded computer, and transmits the collected sensor data to the embedded computer in real time;

S5. The embedded computer receives the sensor data of the displacement sensor identification and acquisition module, and combines the sensor number information transmitted by the sensor and the wireless transmission module to obtain the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically corresponds to the sensor number information. The calibration table is matched, and the current displacement value of the displacement sensor is accurately converted.

The beneficial effects of this embodiment are: when the embedded computer is powered on through the displacement sensor, the output signal determines the type parameter of the access displacement sensor, so that there is no need to manually select the sensor type, and the type of the access displacement sensor is automatically identified;

The data acquisition module has two built-in sensor acquisition logics, and selects the corresponding type of sensor acquisition logic according to the sensor type parameters sent by the embedded computer, and can collect sensor data in real time for different types of sensors;

In addition to uploading the detection data required by the static load test regulations to the designated supervision platform in real time, the wireless transmission module is also responsible for automatically obtaining the calibration table parameters of the inductive displacement sensor from the manufacturer's server, and automatically and the connected inductance. The channel and number of the displacement sensor are automatically matched. For the inductive displacement sensor, there is no need to manually match the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. The utility model provides an automatic discernment displacement sensor's dead load detection device which characterized in that: the system comprises an embedded computer, a wireless transmission module, a displacement sensor and a displacement sensor identification and acquisition module;

the displacement sensor is electrically connected with the input end of the displacement sensor identification and acquisition module, the output end of the displacement sensor identification and acquisition module is electrically connected with the I/O of the embedded computer, and the embedded computer is electrically connected with the wireless transmission module.

2. The static load detecting device for an automatic recognition displacement sensor as claimed in claim 1, wherein: the displacement sensor comprises a capacitive grid type displacement sensor and an inductive frequency modulation displacement sensor;

the output ends of the capacitive grid displacement sensor and the inductive frequency modulation displacement sensor are respectively and electrically connected with the input end of the displacement sensor identification and acquisition module.

3. The dead load detecting device for an automatic recognition displacement sensor as claimed in claim 2, wherein: the displacement sensor identification and acquisition module comprises: the CPLD comprises an external interface, a first receiving circuit, a second receiving circuit and a CPLD chip;

the capacitive-grid displacement sensor and the inductive frequency modulation displacement sensor are connected with an external interface, the input end of the first receiving circuit and the input end of the second receiving circuit are respectively electrically connected with wiring terminals of the external interface in a one-to-one correspondence manner, the output end of the first receiving circuit and the output end of the second receiving circuit are respectively electrically connected with I/O ports of the CPLD chip in a one-to-one correspondence manner, and the CPLD chip is electrically connected with the embedded computer.

4. A static load detecting device of an automatic identifying displacement sensor as claimed in claim 3, wherein: the first receiving circuit comprises a first differential-to-single-ended circuit and a second differential-to-single-ended circuit which are identical in structure;

the differential input end of the first differential-to-single-ended circuit and the differential input end of the second differential-to-single-ended circuit are electrically connected with the four wiring terminals of the external interface in a one-to-one correspondence manner, and the output end of the first differential-to-single-ended circuit and the output end of the second differential-to-single-ended circuit are electrically connected with the I/O ports of the CPLD chip in a one-to-one correspondence manner.

5. The dead load detecting device for an automatic recognition displacement sensor as claimed in claim 4, wherein: the first differential-to-single-ended circuit comprises a MAX3485ECSA receiver and a resistor R101;

pins A and B of the MAX3485ECSA receiver are electrically connected with two connecting terminals of an external interface in a one-to-one correspondence mode respectively, a resistor R101 is connected between the pins A and B in parallel, an RO pin of the MAX3485ECSA receiver is electrically connected with an I/O port of the CPLD, pins RE and DE of the MAX3485ECSA receiver are grounded, and a DI pin of the MAX3485ECSA receiver is suspended.

6. A static load detecting device of an automatic identifying displacement sensor as claimed in claim 3, wherein: the second receiving circuit includes: a resistor R102, a capacitor C98 and an AND gate;

one wiring terminal of the external interface is electrically connected with two input ends of the AND gate respectively, one end of the resistor R102 is connected in parallel in a circuit between the external interface and the AND gate, the other end of the resistor R102 is electrically connected with a power supply, one end of the capacitor C98 is electrically connected with a power supply end of the AND gate, and the other end of the capacitor C98 is grounded.

7. The static load detecting device for an automatic recognition displacement sensor as claimed in claim 1, wherein: the GPS module is electrically connected with the microprocessor.

8. A method for automatically identifying a static load detection device of a displacement sensor is characterized by comprising the following steps: the method comprises the following steps:

s1, powering on the static load detection device, and initializing each module;

s2, a displacement sensor identification and acquisition module arranged in the static load detection device identifies and judges the type of the accessed sensor according to a preset sensor identification scheme, and sends the identified sensor type parameters and the sensor number information to the embedded computer;

s3, the embedded computer sends the identified sensor type parameters to the displacement sensor identification and acquisition module and starts the displacement sensor identification and acquisition module to work;

s4, the displacement sensor identification and acquisition module gates the acquisition logic of the corresponding type of sensor according to the sensor type parameters sent by the embedded computer, and transmits the acquired sensor data to the embedded computer in real time;

s5, the embedded computer receives the sensor data of the displacement sensor identification and acquisition module, and obtains the calibration table parameters of the displacement sensor from the manufacturer server by combining the sensor number information transmitted by the sensor and the wireless transmission module, and the calibration table parameters are automatically matched with the calibration table of the sensor corresponding to the sensor number information, and the current displacement value of the displacement sensor is accurately converted.

9. The identification method of a static load detection device for automatically identifying a displacement sensor according to claim 8, wherein: the sensor identification scheme in the step S2 is as follows: if the accessed sensor outputs CLK and DAT signals, the accessed sensor is a capacitance grid type displacement sensor;

if the accessed sensor outputs an FRQ signal, the accessed sensor is an inductive frequency modulation displacement sensor.

10. The identification method of a static load detection device for automatically identifying a displacement sensor according to claim 9, wherein: the S2 further includes: if the accessed sensor is an inductive frequency modulation displacement sensor, the number information of the inductive frequency modulation displacement sensor is sent to the embedded computer within 5s of the access electrification of the inductive frequency modulation displacement sensor, and then the current frequency value is sent.

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