Mining intrinsic safety type multichannel vibrating wire data acquisition instrument

Abstract

The invention relates to a mining intrinsic safety type multi-channel vibrating wire data acquisition instrument which comprises a single chip microcomputer electrically connected with an upper computer, the single chip microcomputer is electrically connected with a decoder, the decoder is electrically connected with a vibrating wire sensor through a switching circuit, the single chip microcomputer adopts an RS485 communication protocol, the single chip microcomputer continuously scans command frames on an RS485 bus when in standby, and sends the command frames to the upper computer; whether a command frame sent by the upper computer exists or not is checked, when it is confirmed that an acquisition command is received, the single-chip microcomputer sends an excitation frequency sweeping signal to the vibrating wire sensor to enable the steel wire in the vibrating wire sensor to vibrate, at the moment, subtle sound of vibration of the steel wire in the sensor can be heard, after several milliseconds, sending of the excitation signal is stopped, and frequency acquisition is conducted; after the frequency acquisition is completed, the ambient temperature is acquired through a thermocouple of the vibrating wire sensor, and the numerical values of the frequency and the temperature are returned to the upper computer through a response frame after the acquisition. The device can be connected with vibrating wire sensors such as a strain gauge, a stressometer, an axial force meter, a reinforcement meter, a displacement meter and the like to measure the linear variation of a measured structure.

Description

Technical Field

[0001] The invention belongs to the technical field of stress, strain and displacement monitoring inside a tunnel and a bridge and tunnel slope, and relates to an intrinsically safe multi-channel vibrating wire data acquisition instrument for mining. Background Art

[0002] The existing technology requires pre-embedded stress, strain and displacement monitoring equipment in concrete structure beams, columns, pile foundations, supports, retaining walls, hydraulic structures, linings, piers and footings, bridges, tunnel linings, tunnel internal surrounding rock, coal mine tunnel surrounding rock and other buildings. The number of channels of monitoring equipment in the existing technology is relatively small and cannot meet the needs, and the data acquisition instrument needs to be easy to install, stable and durable. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a mining intrinsically safe multi-channel vibrating wire data acquisition instrument.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A mine-used intrinsically safe multi-channel vibrating string data acquisition instrument comprises a single chip microcomputer electrically connected to a host computer, the single chip microcomputer is electrically connected to a decoder, the decoder is electrically connected to a vibrating string sensor through a switch circuit, the single chip microcomputer adopts RS485 communication protocol, the single chip microcomputer continuously scans command frames on the RS485 bus when in standby mode, checks whether there are command frames sent by the host computer, and when confirming that a collection command has been received, the single chip microcomputer sends an excitation frequency sweep signal to the vibrating string sensor to vibrate a steel string inside the vibrating string sensor, at which time a subtle sound of the steel string vibrating in the sensor can be heard, and after a few milliseconds, the sending of the excitation signal is stopped, and frequency collection is performed, and after the frequency collection is completed, the ambient temperature is collected through a thermocouple of the vibrating string sensor, and after the collection, the frequency and temperature values ​​are returned to the host computer through a response frame.

[0006] Furthermore, the chip model of the single-chip microcomputer is STM32F103RET6.

[0007] Furthermore, the decoder chip is 74HC154D, and the switch circuit 1 includes a relay switch J0. Pin 2 of the relay switch J0 is electrically connected to the anode of the diode D19 and the diode D34 and then to the vibrating string sensor, and then to ground. Pin 1 of the relay switch J0 is connected to the cathode of the diode D19 and the diode D34 and then to the collector of the transistor Q14. The emitter of the transistor Q14 is connected to a 3.3V voltage, and the base of the transistor Q14 is electrically connected to one end of the resistor R76. The other end of the resistor R76 is connected to pin 1 of the decoder. Pin 18 of the decoder is connected to pin 19 and then to one end of the resistor R73 and then to pin 21 of the microcontroller. The other end of the resistor R73 is connected to a 3.3V power supply, and pins 20, 21, 22, and 23 of the decoder are electrically connected to pins 22, 23, 24, and 25 of the microcontroller, respectively.

[0008] Furthermore, there are 16 switch circuits, all of which are encapsulated with epoxy resin, and the corresponding pins of the switch circuits are electrically connected to pins 1 to 11 and pins 13 to 17 of the decoder in sequence.

[0009] Furthermore, the RS485 communication circuit includes a transceiver U9, the model of which is MAX3485, the pin 1 of the transceiver U9 is connected to one end of a resistor R42, the other end of the resistor R42 is electrically connected to the single-chip microcomputer, the pins 2 and 3 of the transceiver U9 are connected and then electrically connected to one end of a resistor R41, the other end of the resistor R41 is electrically connected to the single-chip microcomputer, the pin 4 of the transceiver U9 is electrically connected to one end of a resistor R36, the other end of the resistor R36 is electrically connected to the single-chip microcomputer, the pin 5 of the transceiver U9 is grounded, and the pin 6 of the transceiver U9 is connected. Electrically connected to one end of resistor R33, the other end of resistor R33 is electrically connected to pin 1 of P3 and then electrically connected to pin 2 of transient suppression diode U8, pin 1 of transient suppression diode U8 is connected to pin 2 of transient suppression diode U7 and then grounded, pin 1 of transient suppression diode U7 is electrically connected to pin 2 of P3 and then electrically connected to one end of resistor R43, one end of resistor R43 is connected to pin 8 of transceiver U9, the voltage pin of transceiver U9 is electrically connected to one end of capacitor C39 and then connected to a 3.3V power supply, and the other end of capacitor C39 is grounded.

[0010] Furthermore, the collector is powered by a KDY660 / 12 mining-grade cast-in-place intrinsically safe DC power supply.

[0011] Furthermore, the collector has an overvoltage protection circuit.

[0012] Furthermore, it includes an upper shell and a lower shell that are assembled, a mounting bracket is fixed in the internal cavity of the upper shell, a sealing box is fixed on the mounting bracket, a circuit board 1 is fixed in the sealing box, a circuit board 2 is also connected to the sealing box, four sockets are symmetrically arranged on the left and right sides of the upper shell, leads from the circuit board are led out from the sockets, and the leads are connected to the vibrating string sensor.

[0013] Furthermore, the upper shell and the lower shell are made of ABS plastic.

[0014] The beneficial effects of the present invention are:

[0015] The invention is a Class I explosion-proof (intrinsically safe) geological disaster safety monitoring equipment that is easy to install, stable, durable and low-cost, developed by combining many years of field project experience with advanced design and technology. It can be connected to vibrating string sensors such as strain gauges, stress gauges, axial force gauges, rebar gauges, displacement gauges, etc. The sensor excites the vibrating string to make it resonate, and picks up its vibration frequency signal at the same time, thereby measuring the linear change of the measured structure; the invention can also synchronously measure the temperature value of the buried point.

[0016] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 The front view created for the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view at AA;

[0020] Figure 3 A right side view created for the present invention;

[0021] Figure 4 A schematic diagram of a simple circuit connection created by the present invention;

[0022] Figure 5 A schematic diagram of the circuit connection of the single chip microcomputer created by the present invention;

[0023] Figure 6 A schematic diagram of the circuit connection of the decoder created by the present invention;

[0024] Figure 7A circuit diagram of the switch circuit created by the present invention;

[0025] Figure 8 A circuit diagram of one of the RS485 communication circuits created by the present invention;

[0026] Fig. 9 A circuit diagram of another RS485 communication circuit created by the present invention;

[0027] Fig.10 A voltage stabilizing circuit diagram created by the present invention;

[0028] Fig.11 A current control circuit created for the present invention;

[0029] Fig.12 A low voltage difference voltage stabilizing circuit diagram created by the present invention;

[0030] Fig.13 A 12V-5V overvoltage protection circuit created by the present invention;

[0031] Fig.14 The invention provides a 12V-24V overvoltage protection circuit.

[0032] Figure numerals: 1. upper shell; 2. mounting bracket; 3. encapsulation box; 4. circuit board two; 5. screw one; 6. circuit board one; 7. insulating sleeve; 8. nut; 9. screw two; 10. spring washer; 11. flat washer; 12. lower shell; 13. screw three; 14. handle; 15. socket; 16. indicator nameplate; 17. nameplate; 18. warning nameplate; 19. sealing strip. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] See also Figures 1 to 9 , is a mine intrinsically safe multi-channel vibrating wire data acquisition instrument, including an assembled upper shell 1 and a lower shell 12, the upper shell 1 and the lower shell 12 are fixed, a mounting bracket 2 is fixed in the internal cavity of the upper shell 1, a casting box 3 is fixed on the mounting bracket 2, a circuit board 6 is fixed in the casting box 3, and a circuit board 4 is connected to the casting box 3 through an insulating sleeve 7, and the circuit board 4 is fixed to the casting box 3 through a screw 5 and a nut 8. The mounting bracket 2 is fixed to the inner top of the upper shell 1 through a screw 9, a spring washer 10 and a flat washer 11.

[0037] Four sockets 15 are symmetrically arranged on the left and right sides of the upper housing 1. Leads from the circuit board are led out from the sockets 15. The leads are connected to vibrating wire sensors. The vibrating wire sensors are used to be buried in buildings. The invention has 16 channels and can connect up to 16 vibrating wire sensors.

[0038] The connection between the upper shell 1 and the lower shell 12 is equipped with a sealing strip 19, and the upper shell 1 and the lower shell 12 are fixedly connected by screws 13. A handle 14 is provided on the upper shell 1, and an indication nameplate 16, a nameplate 17 and a warning nameplate 18 are provided on the outer upper end surface of the upper shell 1.

[0039] Since it is a mining collector, the material of the upper shell 1 and the lower shell 12 needs to meet the flame retardant and antistatic functions. The upper shell 1 and the lower shell 12 are preferably made of ABS plastic, and the surface insulation resistance of the upper shell 1 and the lower shell 12 should be ≤1GΩ (tested at relative humidity (50±5)%). The protective performance of the shell has been tested and complies with the IP65 regulations in GB / T4208-2017.

[0040] The chip model of the single-chip microcomputer of the acquisition instrument is STM32F103RET6. The single-chip microcomputer is electrically connected to the decoder, and the decoder is electrically connected to the vibrating string sensor through the switch circuit. The chip of the decoder is 74HC154D. Let's take one of the switch circuits as an example. Switch circuit 1 includes relay switch J0. Pin 2 of relay switch J0 is electrically connected to the positive pole of diode D19 and diode D34 and the vibrating string sensor and then grounded. Pin 1 of relay switch J0 is connected to the negative pole of diode D19 and diode D34 and then electrically connected to the collector of transistor Q14. The emitter of transistor Q14 is connected to 3.3V voltage. The base of transistor Q14 is electrically connected to one end of resistor R76, and the other end of resistor R76 is connected to pin 1 of the decoder. There are 16 such circuits, and all 16 circuits are cast with epoxy resin. The corresponding pins of the switch circuit are electrically connected to pins 1 to 11 and pins 13 to 17 of the decoder in sequence.

[0041] Pin 18 of the decoder is connected to pin 19, and then electrically connected to one end of resistor R73, and then electrically connected to pin 21 of the microcontroller. The other end of resistor R73 is connected to a 3.3V power supply. Pin 20, pin 21, pin 22, and pin 23 of the decoder are electrically connected to pin 22, pin 23, pin 24, and pin 25 of the microcontroller, respectively.

[0042] This data collector adopts RS485 communication protocol. RS485 communication circuit includes transceiver U9. The model of transceiver U9 is MAX3485. Pin 1 of transceiver U9 is connected to one end of resistor R42. The other end of resistor R42 is electrically connected to pin 43 of microcontroller. Pin 2 and pin 3 of transceiver U9 are connected and then electrically connected to one end of resistor R41. The other end of resistor R41 is electrically connected to pin 41 of microcontroller. Pin 4 of transceiver U9 is electrically connected to one end of resistor R36. The other end of resistor R36 is electrically connected to pin 42 of microcontroller. Pin 1 of transceiver U9 is electrically connected to one end of resistor R41. 5 is grounded, pin 6 of transceiver U9 is electrically connected to one end of resistor R33, the other end of resistor R33 is electrically connected to pin 1 of P3 and then electrically connected to pin 2 of transient suppression diode U8, pin 1 of transient suppression diode U8 is connected to pin 2 of transient suppression diode U7 and then grounded, pin 1 of transient suppression diode U7 is electrically connected to pin 2 of P3 and then electrically connected to one end of resistor R43, one end of resistor R43 is connected to pin 8 of transceiver U9, a voltage pin of transceiver U9 is electrically connected to one end of capacitor C39 and then connected to a 3.3V power supply, and the other end of capacitor C39 is grounded.

[0043] The RS485 communication circuit includes a transceiver U19, the model of which is MAX3485, a pin 1 of the transceiver U19 is connected to one end of a resistor R100, the other end of the resistor R100 is electrically connected to a pin 30 of the single-chip microcomputer, a pin 2 and a pin 3 of the transceiver U19 are connected and then electrically connected to one end of a resistor R98, the other end of the resistor R98 is electrically connected to a pin 58 of the single-chip microcomputer, a pin 4 of the transceiver U19 is electrically connected to one end of a resistor R97, the other end of the resistor R97 is electrically connected to a pin 29 of the single-chip microcomputer, a pin 5 of the transceiver U19 is grounded, and the transceiver U Pin 6 of P19 is electrically connected to one end of resistor R96, the other end of resistor R96 is electrically connected to pin 1 of P5 and then electrically connected to pin 2 of transient suppression diode U18, pin 1 of transient suppression diode U18 is connected to pin 2 of transient suppression diode U17 and then grounded, pin 1 of transient suppression diode U17 is electrically connected to pin 2 of P5 and then electrically connected to one end of resistor R99, one end of resistor R99 is connected to pin 8 of transceiver U19, a voltage pin of transceiver U19 is electrically connected to one end of capacitor C61 and then connected to a 3.3V power supply, and the other end of capacitor C61 is grounded.

[0044] like Fig.10 The voltage stabilizing circuit includes a voltage stabilizer U12 and its auxiliary circuits. The chip model of the voltage stabilizer U12 is LM2577.

[0045] like Fig.12 The low voltage dropout voltage regulator circuit diagram includes a low voltage dropout voltage regulator U5 and its auxiliary circuits. The chip model of the low voltage dropout voltage regulator U5 is LMI 117MP X-3.3.

[0046] Since it is a mining collector, in order to ensure the safe use of the collector, the present invention designs an overvoltage protection circuit, such as Fig.13 The 12V-5V overvoltage protection circuit created by the present invention; the power input end of VCC12V is electrically connected to the positive electrode of the diode Q8, the negative electrode of the diode Q8 is electrically connected to one end of the capacitor C38 and one end of the resistor R35 and then grounded, and the other end of the capacitor C38 is grounded; the other end of the resistor R35 is electrically connected to one end of the resistor R40 and the positive electrode of the voltage zener diode D12, the other end of the resistor R40 is grounded, and the negative electrode of the voltage zener diode D12 outputs a 5V voltage.

[0047] Fig.14In the 12V-24V overvoltage protection circuit created by the present invention, the power input end of VCC12V is electrically connected to the positive electrode of the diode Q2, the negative electrode of the diode Q2 is electrically connected to one end of the capacitor C4 and one end of the resistor R68 and then grounded, and the other end of the capacitor C4 is grounded; the other end of the resistor R68 is electrically connected to one end of the resistor R70 and the positive electrode of the voltage zener diode D17, the other end of the resistor R70 is grounded, and the negative electrode of the voltage zener diode D17 outputs a 24V voltage.

[0048] The data collector is powered by KDY660 / 12 mining-grade cast-in-place intrinsically safe DC power supply.

[0049] The working principle of the invention:

[0050] In the data acquisition process created by the present invention, the data acquisition instrument continuously scans the command frames on the RS485 bus when in standby mode to check whether there are command frames sent by the host computer. When a command is received, the frame header, frame footer, and CRC check are first used to analyze whether the data frame is correct. If correct, the command is executed. When it is confirmed that the acquisition command has been received, the vibrating string data acquisition instrument sends an excitation sweep signal to the vibrating string sensor to vibrate the steel string inside the sensor. At this time, the subtle sound of the steel string vibrating in the sensor can be heard. After a few milliseconds, the sending of the excitation signal is stopped and the frequency is collected. After the frequency acquisition is completed, the ambient temperature is collected through the thermocouple of the sensor. After the acquisition, the frequency and temperature values ​​are returned to the host computer through the response frame. At this point, a collection process is completed, and the vibrating string data acquisition instrument enters the standby state, waiting for the next command.

[0051] The invention creates a method for measuring the linear deformation of the buried point. When the structure is subjected to force and produces linear expansion and contraction deformation, the vibrating string sensor rigidly connected to the structure produces synchronous deformation, which is transmitted to the vibrating string through the front and rear end seats to cause stress / strain / displacement changes, thereby changing the natural vibration frequency of the vibrating string. The vibrating string data acquisition instrument applies the principle of "collection and reading" to measure frequency and temperature. The data is transmitted to the display terminal through the RS485 communication interface.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A mine-use intrinsically safe multi-channel vibrating wire data acquisition instrument, characterized in that: It includes a single chip microcomputer electrically connected to a host computer, the single chip microcomputer is electrically connected to a decoder, the decoder is electrically connected to a vibrating string sensor through a switch circuit, the single chip microcomputer adopts RS485 communication protocol, the single chip microcomputer continuously scans the command frame on the RS485 bus when in standby mode, and checks whether there is a command frame sent by the host computer, when it is confirmed that a collection command is received, the single chip microcomputer sends an excitation frequency sweep signal to the vibrating string sensor to vibrate the steel string inside the vibrating string sensor, at which time a subtle sound of the steel string vibrating in the sensor can be heard, after a few milliseconds, the sending of the excitation signal is stopped, and the frequency is collected, and after the frequency collection is completed, the ambient temperature is collected through the thermocouple of the vibrating string sensor, and after the collection, the frequency and temperature values ​​are returned to the host computer through a response frame.

2. The intrinsically safe multi-channel vibrating wire data acquisition instrument for mining according to claim 1, characterized in that: The chip model of the microcontroller is STM32F103RET6.

3. The mine-used intrinsically safe multi-channel vibrating wire data acquisition instrument according to claim 2 is characterized in that: The chip of the decoder is 74HC154D, and the switch circuit 1 includes a relay switch J0. Pin 2 of the relay switch J0 is electrically connected to the positive electrode of the diode D19 and the diode D34 and then to the vibrating string sensor, and then to ground. Pin 1 of the relay switch J0 is connected to the negative electrode of the diode D19 and the diode D34 and then to the collector of the transistor Q14. The emitter of the transistor Q14 is connected to a 3.3V voltage, and the base of the transistor Q14 is electrically connected to one end of the resistor R76. The other end of the resistor R76 is connected to pin 1 of the decoder. Pin 18 of the decoder is connected to pin 19 and then to one end of the resistor R73 and then to pin 21 of the microcontroller. The other end of the resistor R73 is connected to a 3.3V power supply, and pins 20, 21, 22, and 23 of the decoder are electrically connected to pins 22, 23, 24, and 25 of the microcontroller, respectively.

4. The mine-used intrinsically safe multi-channel vibrating wire data acquisition instrument according to claim 3 is characterized in that: There are 16 switch circuits, all of which are encapsulated with epoxy resin. The corresponding pins of the switch circuits are electrically connected to pins 1 to 11 and pins 13 to 17 of the decoder in sequence.

5. The intrinsically safe multi-channel vibrating wire data acquisition instrument for mining according to claim 1, characterized in that: The RS485 communication circuit includes a transceiver U9, the model of which is MAX3485. Pin 1 of the transceiver U9 is connected to one end of a resistor R42, and the other end of the resistor R42 is electrically connected to the single-chip microcomputer. Pin 2 and pin 3 of the transceiver U9 are connected and then electrically connected to one end of a resistor R41, and the other end of the resistor R41 is electrically connected to the single-chip microcomputer. Pin 4 of the transceiver U9 is electrically connected to one end of a resistor R36, and the other end of the resistor R36 is electrically connected to the single-chip microcomputer. Pin 5 of the transceiver U9 is grounded, and pin 6 of the transceiver U9 is connected to resistor R41. One end of R33 is electrically connected, the other end of resistor R33 is electrically connected to pin 1 of P3 and then electrically connected to pin 2 of transient suppression diode U8, pin 1 of transient suppression diode U8 is connected to pin 2 of transient suppression diode U7 and then grounded, pin 1 of transient suppression diode U7 is electrically connected to pin 2 of P3 and then electrically connected to one end of resistor R43, one end of resistor R43 is connected to pin 8 of transceiver U9, the voltage pin of transceiver U9 is electrically connected to one end of capacitor C39 and then connected to a 3.3V power supply, and the other end of capacitor C39 is grounded.

6. The mine-used intrinsically safe multi-channel vibrating wire data acquisition instrument according to claim 1, characterized in that: The collector is powered by KDY660 / 12 mining-grade cast-in-place intrinsically safe DC power supply.

7. The intrinsically safe multi-channel vibrating wire data acquisition instrument for mining according to claim 1, characterized in that: The collector has an overvoltage protection circuit.

8. The mine-used intrinsically safe multi-channel vibrating wire data acquisition instrument according to claim 1, characterized in that: The invention comprises an upper shell (1) and a lower shell (12) which are assembled together. A mounting bracket (2) is fixed in the internal cavity of the upper shell (1). A casting box (3) is fixed on the mounting bracket (2). A circuit board (6) is fixed in the casting box (3). A circuit board (4) is also connected to the casting box (3). Four sockets (15) are symmetrically arranged on the left and right sides of the upper shell (1). Lead wires from the circuit board are led out from the sockets (15), and the lead wires are connected to a vibrating wire sensor.

9. The intrinsically safe multi-channel vibrating wire data acquisition instrument for mining according to claim 8, characterized in that: The upper shell (1) and the lower shell (12) are made of ABS plastic.

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