A static load detection device and identification method for automatically identifying a displacement sensor

Abstract

The present invention proposes a static load detection device and identification method for automatically identifying a displacement sensor. By setting a displacement sensor identification and acquisition module, the type of the connected sensor is automatically identified and judged according to a preset sensor identification scheme, and the identified sensor type parameters and sensor number information are sent to an embedded computer. The embedded computer can judge the sensor type by pre-reading data when powered on, thereby achieving the purpose of automatic identification without manual selection of the sensor type; by setting a wireless transmission module, for an 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, and the static load detection device automatically updates the calibration table and performs automatic matching.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering detection, and in particular to a static load detection device and an identification method for automatically identifying a displacement sensor. Background Art

[0002] Pile foundation is a kind of building foundation structure, buried underground, and belongs to concealed engineering. Accurately judging the quality of pile foundation engineering is very important to ensure the quality and safety of the whole building. According to the Technical Specification for Building Pile Foundation Testing JGJ106-2014, the main methods of pile foundation testing include static load test, core drilling method, low strain method, high strain method, and acoustic wave transmission method. Among them, static load test usually adopts static load tester, which includes the following parts: static load detection host, displacement sensor, oil pressure sensor, acquisition base station, and oil pump controller.

[0003] At present, the displacement sensors used in static load testing are mainly divided into the following two categories: capacitive displacement sensors and inductive frequency modulation displacement sensors. Since these two types of displacement sensors have their own characteristics and advantages, and their market share is evenly divided, the static load tester needs to have the function of accessing these two types of sensors.

[0004] At present, before the static load detection system of each manufacturer starts the test, the detection personnel need to clarify the type of sensor connected, and then select the sensor type on the static load detection host. If the capacitive displacement sensor is used on site, since its output digital signal can be directly resolved into the current displacement value, no calibration conversion is required, so there is no need to register the sensor number of each channel in advance. If the inductive frequency modulation displacement sensor is used on site, it is necessary to select the calibration table corresponding to the frequency modulation displacement sensor connected to each channel at the same time, and it must correspond one to one. If the selected calibration table does not correspond to the frequency modulation displacement sensor, the actual displacement value will have a large error during the test, affecting the detection quality and efficiency. Therefore, in this way, before the sensor is installed and connected, the sensor number connected to each channel needs to be manually recorded. If it is not recorded in advance and randomly connected, it is necessary to manually go to the bottom of the pile to check and register the number and channel. This back and forth has great safety hazards. In addition, before leaving the factory, each manufacturer's static load tester needs to manually enter the calibration table corresponding to the standard inductive displacement sensor number into the static load host, so that the user can easily call it when matching the sensor. First of all, it is time-consuming and laborious, and there is a risk of input errors. In addition, if the user needs to replace or purchase a new displacement sensor, it is usually necessary to send it back to the manufacturer for entry or directly send the calibration table to the user to add it by himself, which has a poor user experience and affects the construction period. In summary, the operation and calibration mode of the static load tester selected by each manufacturer for the sensor type have put forward relatively high requirements for the test personnel, are prone to errors, and have safety hazards.

[0005] Therefore, in order to solve the above problems, the present invention provides a static load detection device and identification method for automatically identifying a displacement sensor. The sensor type can be automatically identified without manually selecting the sensor type. For inductive displacement sensors, there is no need to manually match the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching. Summary of the invention

[0006] In view of this, the present invention proposes a static load detection device and identification method for automatically identifying a displacement sensor. The sensor type can be automatically identified without manually selecting the sensor type. For inductive displacement sensors, there is no need to manually match the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching.

[0007] The technical solution of the present invention is implemented as follows: On the one hand, the present invention provides a static load detection device for automatically identifying a displacement sensor, comprising an embedded computer, a wireless transmission module, a displacement sensor, and a displacement sensor identification and acquisition module;

[0008] 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.

[0009] On the basis of the above technical solution, preferably, the displacement sensor includes a capacitive displacement sensor and an inductive frequency modulation displacement sensor;

[0010] The output ends of the capacitive displacement sensor and the inductive frequency modulation displacement sensor are electrically connected to the input end of the displacement sensor identification and acquisition module respectively.

[0011] On the basis of the above technical solution, preferably, the displacement sensor identification and acquisition module includes: an external interface, a first receiving circuit, a second receiving circuit and a CPLD chip;

[0012] The capacitive displacement sensor and the inductive frequency modulation displacement sensor are connected to the external interface, the input end of the first receiving circuit and the input end of the second receiving circuit are electrically connected to the wiring terminals of the external interface in a one-to-one correspondence, the output end of the first receiving circuit and the output end of the second receiving circuit are electrically connected to the I / O port of the CPLD chip in a one-to-one correspondence, and the CPLD chip is electrically connected to the embedded computer.

[0013] Further preferably, the first receiving circuit includes a first differential-to-single-ended circuit and a second differential-to-single-ended circuit having the same structure;

[0014] 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 to the four wiring terminals of the external interface in a one-to-one correspondence, 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 to the I / O port of the CPLD chip in a one-to-one correspondence.

[0015] Further preferably, the first differential-to-single-ended circuit includes a MAX3485ECSA receiver and a resistor R101;

[0016] The A and B pins of the MAX3485ECSA receiver are electrically connected to the two wiring terminals of the external interface respectively, and 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 left floating.

[0017] Further preferably, the second receiving circuit comprises: a resistor R102, a capacitor C98 and an AND gate;

[0018] A connection terminal of the external interface is electrically connected to the two input terminals of the AND gate respectively, one end of the resistor R102 is connected in parallel in the circuit between the external interface and the AND gate, the other end of the resistor R102 is electrically connected to the power supply, one end of the capacitor C98 is electrically connected to the power supply terminal of the AND gate, and the other end of the capacitor C98 is grounded.

[0019] On the basis of the above technical solution, preferably, it also includes a GPS module electrically connected to the microprocessor.

[0020] 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:

[0021] S1. The static load detection device is powered on and each module is initialized;

[0022] S2, the displacement sensor identification and acquisition module built into 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;

[0023] 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;

[0024] S4, 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;

[0025] S5. The embedded computer receives the sensor data from the displacement sensor identification and acquisition module, and combines it with the sensor number information transmitted by the sensor, and the calibration table parameters of the displacement sensor obtained from the manufacturer's server by the wireless transmission module, and automatically matches it with the calibration table of the sensor corresponding to the sensor number information, and accurately converts the current displacement value of the displacement sensor.

[0026] 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 displacement sensor;

[0027] If the connected sensor outputs a FRQ signal, the connected sensor is an inductive frequency modulation displacement sensor.

[0028] Further preferably, S2 also includes: if the connected sensor is an inductive frequency modulation displacement sensor, within 5 seconds after the inductive frequency modulation displacement sensor is connected and powered on, sending the serial number information of the inductive frequency modulation displacement sensor to the embedded computer, and then sending the current frequency value.

[0029] The static load detection device and identification method of the automatic identification displacement sensor of the present invention have the following beneficial effects compared with the prior art:

[0030] (1) By setting up a displacement sensor identification and acquisition module, the type of the connected sensor is automatically identified and judged according to a preset sensor identification scheme, and the identified sensor type parameters and sensor number information are sent to the embedded computer. The embedded computer can determine the sensor type by pre-reading data when powered on, thereby achieving the purpose of automatic identification without manual selection of sensor type;

[0031] (2) By setting the sensor acquisition logic of the capacitive displacement sensor and the inductive frequency modulation displacement sensor in the displacement sensor identification and acquisition module, sensor data of different types of sensors can be collected in real time;

[0032] (3) By setting up a wireless transmission module, for an 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. There is no need to manually match the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching;

[0033] (4) Within 5 seconds after the inductive frequency modulation displacement sensor is powered on, the serial number information of the inductive frequency modulation displacement sensor is sent to the embedded computer, and then the current frequency value is sent, thereby realizing the time-sharing acquisition of the serial number and frequency, which greatly increases the applicability and versatility of the inductive frequency modulation displacement sensor;

[0034] (5) A first receiving circuit is set 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 parameter, sensor number information and sensor data output by the capacitive displacement sensor are received through the first receiving circuit, and the above information is sent to the CPLD chip; on the other hand, since the capacitive displacement sensor outputs CLK and DATA signals, and the CLK and DATA signals are converted into differential signals after passing through the external interface, which 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;

[0035] (6) A second receiving circuit is set 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, sensor number information and sensor data output by the inductive frequency modulation displacement sensor are received through the second receiving circuit, and the above 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 CPLD chip pins are protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural diagram of a static load detection device for automatically identifying a displacement sensor according to the present invention;

[0038] Figure 2 It is a structural diagram of a displacement sensor identification and acquisition module in a static load detection device for automatically identifying a displacement sensor according to the present invention;

[0039] Figure 3 is a circuit diagram of the external interface, the first receiving circuit and the second receiving circuit in Example 2;

[0040] Figure 4 This is a schematic diagram of the pin connections of the CPLD chip in Example 2. DETAILED DESCRIPTION

[0041] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1 As shown, a static load detection device for automatically identifying a displacement sensor of the present invention comprises: an embedded computer, a wireless transmission module, a displacement sensor, a displacement sensor identification and acquisition module and a GPS module.

[0044] The displacement sensor includes a capacitive displacement sensor and an inductive frequency modulation displacement sensor. In this embodiment, the output ends of the capacitive displacement sensor and the inductive frequency modulation displacement sensor are electrically connected to the input end of the displacement sensor identification and acquisition module respectively.

[0045] The displacement sensor identification and acquisition module automatically identifies and determines 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. The embedded computer can determine the sensor type by pre-reading data at power-on, thereby achieving the purpose of automatic identification without manual selection of sensor type; according to the sensor type parameters, the corresponding type of sensor acquisition logic is selected, and the collected sensor data is transmitted 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 displacement sensor; if the connected sensor outputs FRQ signals, the connected sensor is an inductive frequency modulation displacement sensor. The embedded computer can determine the sensor type by pre-reading data at power-on, thereby achieving the purpose of automatic identification.

[0046] It should be noted that the function of the embedded computer to identify whether the signal output by the displacement sensor is a CLK signal, a DATA signal, or a FRQ signal is a unique attribute of the embedded computer. This function is clear and complete to the technicians in this field. Therefore, the principle of the embedded computer identifying the signal type output by the displacement sensor will not be repeated here.

[0047] It should also be noted that the two sensor acquisition logics built into the displacement sensor identification and acquisition module are commonly used technical means in this field, and the two sensor acquisition logics are respectively the data acquisition logics commonly used in this field for capacitive displacement sensors and inductive frequency modulation displacement sensors. When the technical personnel in this field know the scheme recorded in this embodiment, they can integrate the data acquisition logics commonly used in this field for capacitive displacement sensors and inductive frequency modulation displacement sensors in one chip. This technology is clear and complete to the technical personnel in this field, so it will not be repeated here.

[0048] In this embodiment, if the connected sensor is a capacitive displacement sensor, since its output digital signal can be directly parsed into the current displacement value, no calibration conversion is required, therefore, it is not necessary to register the sensor number of each channel in advance; if the connected sensor is an inductive frequency modulation displacement sensor, it is necessary to select the calibration table corresponding to the frequency modulation displacement sensor connected to each channel, and they must correspond one to one. If the selected calibration table does not correspond to the frequency modulation displacement sensor, a large error will occur in the actual displacement value during the test, affecting the detection quality and efficiency. Therefore, in this embodiment, a wireless transmission module is set, 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 automatically matches the calibration table of the numbered sensor without manual matching of the calibration table according to the sensor data received from the displacement sensor identification and acquisition module, and combines the number information transmitted by the sensor, and accurately converts the current displacement value of the displacement sensor, so as to realize the automatic update of the calibration table and automatic matching of the static load detection device.

[0049] It should be noted that: using a wireless transmission module to obtain information from a server is a commonly used technical means in this field, and this technology is clear and complete to the technicians in this field; in addition, automatically matching the channel and number of the connected sensor is a simple algorithm in this field. When the technicians in this field know the contents recorded in this embodiment, they can obtain the corresponding algorithms and principle information without any doubts, so they will not be repeated here.

[0050] The embedded computer is used to receive the 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; receive the sensor data from the data acquisition module, and combine 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, automatically match the calibration table of the sensor corresponding to the sensor number information, and accurately convert the current displacement value of the displacement sensor. 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 parameters and sensor number information need to be transmitted to the embedded computer.

[0051] 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 calibration table parameters of the displacement sensor obtained from the manufacturer's server by the wireless transmission module, and automatically matches the calibration table of the sensor corresponding to the sensor number information to accurately convert the current displacement value of the displacement sensor. This function belongs to a simple algorithm in this field. When technical personnel in this field know the contents recorded in this embodiment, they can obtain the corresponding algorithm and principle information without any doubt, so they will not be repeated here.

[0052] GPS module for precise location of the static load tester.

[0053] Preferably, in this embodiment, a liquid crystal display screen and a power supply circuit are also included, wherein the power supply circuit supplies power to each module; and the liquid crystal display screen is connected to the embedded computer via an LVDS bus.

[0054] The working principle of this embodiment is as follows: the displacement sensor identification and acquisition module identifies and determines the type of the connected displacement sensor, and sends the identified sensor type parameters and sensor number information to the embedded computer. The embedded computer sends the identified sensor type parameters 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 from the displacement sensor identification and acquisition module, and combines the sensor number information transmitted by the sensor, and the wireless transmission module obtains the calibration table parameters of the displacement sensor from the manufacturer's server, and automatically matches them with the calibration table of the sensor corresponding to the sensor number information, and accurately converts the current displacement value of the displacement sensor.

[0055] The beneficial effects of this embodiment are as follows: by setting the displacement sensor identification and acquisition module, the connected sensor type 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 embedded computer can judge the sensor type by pre-reading data when powered on, thereby achieving the purpose of automatic identification without manual selection of sensor type;

[0056] By setting the sensor acquisition logic of the capacitive displacement sensor and the inductive frequency modulation displacement sensor in the displacement sensor identification and acquisition module, the sensor data of different types of sensors can be collected in real time;

[0057] By setting up a wireless transmission module, for inductive displacement sensors, 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. There is no need for manual matching of the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching.

[0058] Example 2

[0059] Further preferably, in this embodiment, a specific embodiment of the displacement sensor identification and acquisition module is provided. In this embodiment, Figure 2 As shown, 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 displacement sensor and the inductive frequency modulation displacement sensor are connected to the external interface, the input end of the first receiving circuit and the input end of the second receiving circuit are electrically connected to the wiring terminals of the external interface in a one-to-one correspondence, the output end of the first receiving circuit and the output end of the second receiving circuit are electrically connected to the I / O port of the CPLD chip in a one-to-one correspondence, and the CPLD chip is electrically connected to the embedded computer.

[0060] The external interface is used to connect a capacitive displacement sensor or an inductive frequency modulation displacement sensor. In practical applications, the displacement sensor is selected to connect to the external interface in this embodiment according to the practical application. In this embodiment, the external interface uses an XH2P54-7P socket with 7 pins.

[0061] The first receiving circuit, on the one hand, when the external interface is connected to a capacitive displacement sensor, the sensor type parameter, sensor number information and sensor data output by the capacitive displacement sensor are received through the first receiving circuit, and the above information is sent to the CPLD chip; on the other hand, since the capacitive displacement sensor outputs CLK and DAT signals, and the CLK and DATA signals are converted into differential signals after passing through the external interface, which 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 in this embodiment to convert the differential signals corresponding to the CLK and DATA signals into single-ended signals.

[0062] Preferably, in this embodiment, the first receiving circuit includes a first differential-to-single-ended circuit and a second differential-to-single-ended circuit of the same structure; specifically, 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 respectively electrically connected to the four wiring terminals of the external interface in a one-to-one correspondence, 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 respectively electrically connected to the I / O port of the CPLD chip in a one-to-one correspondence. Since the first differential-to-single-ended circuit and the second differential-to-single-ended circuit have the same structure, 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 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.

[0063] like Figure 3 As shown, 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 electrically connected to the two wiring terminals of the external interface in a one-to-one correspondence, 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 suspended.

[0064] The second receiving circuit, on the one hand, when the external interface is connected to an inductive frequency modulation displacement sensor, receives the sensor type parameter, sensor number information and sensor data output by the inductive frequency modulation displacement sensor through the second receiving circuit, and sends the above information to the CPLD chip; on the other hand, performs waveform shaping on the FRQ signal output by the inductive frequency modulation displacement sensor, and protects the CPLD chip pins. In this embodiment, if Figure 3 As shown, DIS_L_CLK0 is used to represent the FRQ signal output by the inductive frequency modulation displacement sensor, and the second receiving circuit includes: a resistor R102, a capacitor C98 and an AND gate; specifically, a terminal of the external interface is electrically connected to the two input terminals of the AND gate respectively, one end of the resistor R102 is connected in parallel in the circuit between the external interface and the AND gate, the other end of the resistor R102 is electrically connected to the power supply, one end of the capacitor C98 is electrically connected to the power supply terminal of the AND gate, and 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.

[0065] 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 sensor data sent by the first receiving circuit and the second receiving circuit, and send the sensor data 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. The connection relationship between it and the other components is as follows: Figure 4 shown.

[0066] 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 barrier displacement sensor, the CLK and DAT signals output by the capacitive barrier displacement sensor are converted into differential signals after passing through the external interface, which are respectively recorded as CLK+0, CLK-0, DATA+0 and DATA-0. The CLK+0 and CLK-0 signals are converted into CLK single-ended signals through a first differential to single-ended circuit; the DATA+0 and DATA-0 signals are converted into DATA single-ended signals through a second differential to single-ended circuit. The converted CLK single-ended signals and DATA single-ended signals are respectively input into the CPLD chip, and transmitted to the embedded computer through the URAT port of the CPLD chip. The embedded computer learns that the connected sensor type is a capacitive barrier displacement sensor.

[0067] When the external interface is connected to an inductive frequency modulation displacement sensor, the inductive frequency modulation displacement sensor outputs a FRQ signal, which is transmitted to the CPLD chip after waveform shaping by the second receiving circuit, and then transmitted to the embedded computer through the URAT port of the CPLD chip. The embedded computer learns that the connected sensor type is an inductive frequency modulation displacement sensor.

[0068] The beneficial effects of this embodiment are as follows: a first receiving circuit is set. On the one hand, when the external interface is connected to a capacitive displacement sensor, the sensor type parameter, sensor number information and sensor data output by the capacitive displacement sensor are received through the first receiving circuit, and the above information is sent to the CPLD chip; on the other hand, since the capacitive displacement sensor outputs CLK and DATA signals, and the CLK and DATA signals are converted into differential signals after passing through the external interface, which 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;

[0069] A second receiving circuit is set up. 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 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 CPLD chip pins are protected.

[0070] Example 3

[0071] Based on Example 1, this example provides a method for improving the efficiency of identifying sensor types and reducing embedded computer processing threads. Since the digital signal output by the capacitive displacement sensor can be directly parsed into the current displacement value, no calibration conversion is required. Therefore, this example is an improvement based on the connected sensor being an inductive frequency modulation displacement sensor.

[0072] Usually, in order to realize the reading and configuration functions of various sensor number information, 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 RS485 interface function is realized, and Modbus and other related communication protocols are used to realize the reading and configuration functions of the sensor number information by interacting with the embedded computer through line commands. 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 in the interface method will inevitably reduce the applicability and versatility of the inductive frequency modulation displacement sensor.

[0073] 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 acquisition module within 5 seconds after the inductive frequency modulation displacement sensor is connected and powered on, and is cached after being parsed and processed by the displacement sensor identification and acquisition module for the embedded computer to obtain on demand, and then the current frequency value is sent, thereby realizing time-sharing acquisition of the number and frequency, which greatly increases the applicability and versatility of the inductive frequency modulation displacement sensor, reduces the processing threads of the embedded computer and the inductive frequency modulation displacement sensor, reduces the load of the embedded computer, and thus improves the recognition efficiency of the sensor type and the sensor data reading rate.

[0074] Example 4

[0075] Based on Example 1, this embodiment provides an identification method for a static load detection device for automatically identifying a displacement sensor, specifically comprising the following steps:

[0076] S1. The static load detection device is powered on and each module is initialized;

[0077] S2, the displacement sensor identification and acquisition module built into the static load detection device identifies and judges the type of the connected displacement sensor according to a preset sensor identification scheme, and sends the identified sensor type parameters and sensor number information to the embedded computer;

[0078] Among them, 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 inductive frequency modulation displacement sensor.

[0079] If the connected sensor is an inductive frequency modulation displacement sensor, the number information of the inductive frequency modulation displacement sensor will be sent to the embedded computer within 5 seconds after the inductive frequency modulation displacement sensor is connected and powered on, and then the current frequency value will be sent, thereby realizing time-sharing acquisition of the number and frequency, which greatly increases the applicability and versatility of the inductive frequency modulation displacement sensor.

[0080] 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;

[0081] S4, 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;

[0082] S5. The embedded computer receives the sensor data from the displacement sensor identification and acquisition module, and combines it with the sensor number information transmitted by the sensor, and the calibration table parameters of the displacement sensor obtained from the manufacturer's server by the wireless transmission module, and automatically matches it with the calibration table of the sensor corresponding to the sensor number information, and accurately converts the current displacement value of the displacement sensor.

[0083] The beneficial effects of this embodiment are as follows: when the embedded computer is powered on through the displacement sensor, the output signal determines the type parameter of the connected displacement sensor, thereby automatically identifying the type of the connected displacement sensor without the need for manual selection of the sensor type;

[0084] 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, so that sensor data can be collected in real time for different types of sensors;

[0085] In addition to uploading various test data required by the static load test procedures 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 matching them with the channel and number of the connected inductive displacement sensor. For the inductive displacement sensor, there is no need for manual matching of the calibration table. The static load detection device automatically updates the calibration table and performs automatic matching.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A static load detection device for automatically identifying a displacement sensor, characterized in that: It includes 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; The displacement sensor includes a capacitive displacement sensor and an inductive frequency modulation displacement sensor; The output ends of the capacitive displacement sensor and the inductive frequency modulation displacement sensor are electrically connected to the input end of the displacement sensor identification and acquisition module respectively; 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 displacement sensor and the inductive frequency modulation displacement sensor are connected to the external interface, the input end of the first receiving circuit and the input end of the second receiving circuit are electrically connected to the wiring terminals of the external interface in a one-to-one correspondence, the output end of the first receiving circuit and the output end of the second receiving circuit are electrically connected to the I / O port of the CPLD chip in a one-to-one correspondence, and the CPLD chip is electrically connected to the embedded computer; The second receiving circuit includes: a resistor R102, a capacitor C98 and an AND gate; A connection terminal of the external interface is electrically connected to the two input ends of the AND gate respectively, one end of the resistor R102 is connected in parallel in the circuit between the external interface and the AND gate, the other end of the resistor R102 is electrically connected to the power supply, one end of the capacitor C98 is electrically connected to the power supply end of the AND gate, and the other end of the capacitor C98 is grounded.

2. A static load detection device for automatically identifying a displacement sensor as claimed in claim 1, characterized in that: The first receiving circuit includes a first differential-to-single-ended circuit and a second differential-to-single-ended circuit having the same 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 respectively electrically connected to the four wiring terminals of the external interface in a one-to-one correspondence, 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 respectively electrically connected to the I / O port of the CPLD chip in a one-to-one correspondence.

3. A static load detection device for automatically identifying a displacement sensor as claimed in claim 2, characterized in that: 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 wiring terminals of the external interface respectively, 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 left floating.

4. The static load detection device for automatically identifying a displacement sensor according to claim 1, characterized in that: Also included is a GPS module electrically connected to the microprocessor.

5. A method for automatically identifying a static load detection device of a displacement sensor, characterized in that: The static load detection device for automatically identifying a displacement sensor according to any one of claims 1 to 4 comprises the following steps: S1. The static load detection device is powered on and each module is initialized; S2, the displacement sensor identification and acquisition module built into 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; S4, 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; S5. The embedded computer receives the sensor data from the displacement sensor identification and acquisition module, and combines it with the sensor number information transmitted by the sensor, and the calibration table parameters of the displacement sensor obtained from the manufacturer's server by the wireless transmission module, and automatically matches it with the calibration table of the sensor corresponding to the sensor number information, and accurately converts the current displacement value of the displacement sensor.

6. A method for automatically identifying a static load detection device of a displacement sensor according to claim 5, characterized in that: The sensor identification scheme in S2 is: if the connected sensor outputs CLK and DAT signals, the connected sensor is a capacitive displacement sensor; If the connected sensor outputs a FRQ signal, the connected sensor is an inductive frequency modulation displacement sensor.

7. The identification method of a static load detection device for automatically identifying a displacement sensor according to claim 6, characterized in that: The step S2 further includes: if the connected sensor is an inductive frequency modulation displacement sensor, within 5 seconds after the inductive frequency modulation displacement sensor is connected and powered on, sending the serial number information of the inductive frequency modulation displacement sensor to the embedded computer, and then sending the current frequency value.

Images