A remote zero device for RZB type borehole strainmeter

Abstract

The utility model discloses a kind of remote zero setting device for RZB type borehole strain gauge, including control box, communication module, memory, controller, magnetic latching relay array, signal acquisition circuit, each external cable and each convenient conductive clamp;Connection seat is provided on the lateral wall of control box, magnetic latching relay array and signal acquisition circuit are electrically connected with connection seat;One end of each external cable is electrically connected on connection seat, the other end of each external cable is respectively electrically connected on each convenient conductive clamp.This remote zero setting device can receive remote control command, without manual zero setting operation in the field, improve the convenience and timeliness of zero setting, using magnetic latching relay array can realize the gating of each external cable, to realize the same on-off connection function with each manual dial switch, and magnetic latching relay array can realize on-off control under the control of controller.

Description

Technical Field

[0001] This utility model relates to a remote zeroing device, and more particularly to a remote zeroing device for an RZB type borehole strain gauge. Background Technology

[0002] The RZB borehole strain gauge, a high-precision instrument for monitoring crustal deformation, is primarily used to measure minute strain changes in the Earth's crust. It plays a crucial role in earthquake monitoring and early warning, geological disaster prevention, and crustal deformation monitoring. Its long-term stability and data reliability directly impact the scientific accuracy and reliability of seismic anomaly detection and seismic situation assessment. However, existing equipment relies on manual on-site intervention for zeroing and calibration. This is particularly problematic for instruments installed in remote areas, significantly extending maintenance cycles and increasing costs. Furthermore, manual operation is susceptible to environmental and human interference, leading to interference and missed identification of geophysical signals such as pre-earthquake strain steps and slow slip. Additionally, the long-term consistency of calibration results is affected by operator subjective experience, hindering the scientific research value of the instrument data. While the RZB series borehole strain gauges have formed a large-scale observation network, zeroing and calibration technology lags behind: existing equipment relies on on-site operation by technicians, with the frequency of manual zeroing and calibration depending on the number of earthquakes; larger earthquakes require more frequent zeroing.

[0003] A borehole strain gauge observes the deformation of the borehole diameter using displacement sensors installed inside the borehole, providing information on the deformation state and dynamic changes of the surrounding rock strata. A differential capacitive displacement sensing circuit is employed, consisting of a transformer and a differential capacitive sensor forming an AC measurement bridge. Crustal deformation causes displacement of the capacitor plates. The resulting bridge imbalance signal, after impedance transformation, AC amplification, phase-sensitive detection, and low-pass filtering, is acquired by an analog-to-digital converter (ADC) to obtain a voltage representing the capacitor plate offset, thereby calculating the strain. A differential three-electrode capacitive sensor and a ratio transformer form the bridge measurement system. The ratio transformer is wound using a special process for precise voltage division; the grounded tap of the ratio arm effectively provides two voltage sources, U1 and U2. Figure 6As shown, the turns ratio (N1 and N2) precisely reflects the ratio of the two voltage amplitudes, i.e., U1:U2 = N1:N2. Adjusting the ratio of N1 to N2 can bring the bridge circuit to a balanced state. At this time, the ratio of N1 to N2 is also the ratio of the two capacitance values ​​of the capacitive sensor. Due to the characteristics of the bridge circuit, after the bridge is balanced, the measuring circuit can detect extremely small imbalances in the bridge circuit caused by the displacement of the capacitor plates. In actual instrument operation, the tap grounding point of the ratio arm is selected by adjusting the DIP switches on each channel of the instrument panel. There are four DIP switch groups, used for zeroing in the north-south, east-west, northwest, and northeast directions, respectively. Each DIP switch group consists of four DIP switches, each with ten DIP settings from 0 to 9, for a total of 160 DIP settings. The capacitive displacement sensor is a three-plate differential capacitor. The gap between the upper and lower plates is fixed, i.e., d1 + d2 = constant, while the middle plate can move up and down. The voltage division ratio U1 / U2 of the ratio arms on both sides of the tap grounding point of a ratio transformer is equal to the turns ratio N1 / N2 on both sides. Each stage of the ratio transformer selects different taps.

[0004] When the bridge is in ideal balance, the voltage drop across the gap between the upper and lower plates of the three-electrode capacitive sensor is the same as the voltage drop across the ratio arms on both sides of the transformer grounding tap. The relationship d1 / d2=N1 / N2=U1 / U2 can be derived. When the middle plate shifts from the balance position, the sensor outputs an unbalanced voltage signal U0 to ground. After amplification, detection, and filtering, its accurate value can be measured using an ADC. If the middle plate shifts too much, the output voltage U0 will be too large, which will cause the back-end circuit to limit the amplitude. It is necessary to reselect the transformer tap grounding point and adjust the turns ratio of the proportional transformer to (N1-n) / (N2+n) so that the bridge returns to a near-balanced state and achieves zeroing. Here, n represents the number of turns that need to be adjusted to rebalance the bridge. Summary of the Invention

[0005] The purpose of this utility model is to provide a remote zeroing device for RZB type borehole strain gauges, which can realize remote zeroing of RZB type borehole strain gauges, so that RZB type borehole strain gauges can quickly return to the reliable monitoring range.

[0006] Technical Solution: The remote zeroing device for an RZB type borehole strain gauge described in this utility model includes a control box, a communication module, a memory, a controller, a magnetic latching relay array, a signal acquisition circuit, various external cables, and various convenient conductive clips. The communication module, memory, controller, magnetic latching relay array, and signal acquisition circuit are all housed within the control box. The controller is electrically connected to the communication module, memory, magnetic latching relay array, and signal acquisition circuit, respectively. A connecting base is provided on the side wall of the control box, and the magnetic latching relay array and signal acquisition circuit are electrically connected to the connecting base. One end of each external cable is electrically connected to the connecting base, and the other end of each external cable is electrically connected to each convenient conductive clip. The convenient conductive clips on the external cables electrically connected to the magnetic latching relay array are used to electrically connect to the various ribbon cables of the DIP switch of the RZB type borehole strain gauge, and the convenient conductive clips on the external cables electrically connected to the signal acquisition circuit are used to electrically connect to the voltage output cable of the middle plate of the differential capacitive displacement sensor.

[0007] Furthermore, the magnetic latching relay array is a switch array consisting of 160 switch modules arranged in 10 rows and 16 columns. Each switch module consists of a driver chip and a magnetic latching relay. The two output terminals of the driver chip are electrically connected to the two ends of the corresponding magnetic latching relay coil. One input terminal of the driver chip of each switch module in the same row is electrically connected to the same input / output terminal of the controller, and the other input terminal of the driver chip of each switch module in the same column is electrically connected to the same input / output terminal of the controller. The stationary and moving contacts of each magnetic latching relay are electrically connected to the respective external cables on the connector.

[0008] Furthermore, the convenient conductive clip includes a strip base, a clamping bending rod, a clamping spring, and a conductive needle; the middle part of the clamping bending rod is pivotally hinged to the strip base via a hinge seat; a cable positioning seat is provided on the opposite side of the strip base and the clamping end of the clamping bending rod, and an arc-shaped limiting groove is provided on the opposite side of the two cable positioning seats; the clamping spring is elastically supported between the strip base and the clamping bending rod, and is used to push the strip base and the clamping end of the clamping bending rod to clamp relative to each other; one end of the conductive needle is fixed to the hinge seat, and the other end is set as a spike end, and the spike end extends between the two cable positioning seats for penetrating the cable to be pierced.

[0009] Furthermore, an adhesive layer is provided on the side of the strip base.

[0010] Furthermore, an inspection window is provided on the front side of the control box, and a closed door is hinged to the inspection window; a door handle is provided on the closed door.

[0011] Furthermore, each of the left and right sides of the control box is provided with a strip-shaped heat dissipation vent, and a water baffle is extended from the upper side of the strip-shaped heat dissipation vent.

[0012] Compared with the prior art, the advantages of this invention are as follows: Each convenient conductive clip allows for quick and easy electrical connection of external cables to the cables to be pierced, achieving electrical connection of all signals required for zeroing the RZB type borehole strain gauge; the magnetic latching relay array enables selection of external cables, achieving the same on / off connection function as manual DIP switches, and the magnetic latching relay array can achieve rapid on / off control under the controller's control; the communication module facilitates network connection, allowing the controller to receive remote control commands without requiring manual on-site zeroing operations, improving the convenience and timeliness of zeroing; the signal acquisition circuit enables real-time acquisition of voltage signals, allowing zeroing operations to be initiated when the voltage of the intermediate plate of the differential capacitive displacement sensor exceeds the set range, enabling the voltage value to quickly recover to the set range, thus ensuring the reliability of the differential capacitive displacement sensor monitoring. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the convenient conductive clip structure of this utility model; Figure 3 This is a schematic diagram of the overall circuit structure of this utility model; Figure 4 This is a schematic diagram of the magnetic latching relay array of this utility model; Figure 5 This is a schematic diagram of the switch module of this utility model; Figure 6 This is the equivalent circuit diagram for strain sensor ratio arm bridge measurement. Detailed Implementation

[0014] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0015] like Figure 1-5As shown, the remote zeroing device for an RZB type borehole strain gauge disclosed in this utility model includes: a control box 1, a communication module, a memory, a controller, a magnetic latching relay array, a signal acquisition circuit, various external cables 6, and various convenient conductive clips; the communication module, memory, controller, magnetic latching relay array, and signal acquisition circuit are all housed in the control box 1, and the controller is electrically connected to the communication module, memory, magnetic latching relay array, and signal acquisition circuit respectively; a connecting base 5 is provided on the side wall of the control box 1, and the magnetic latching relay array and signal acquisition circuit are electrically connected to the connecting base 5; one end of each external cable 6 is electrically connected to the connecting base 5, and the other end of each external cable 6 is electrically connected to each convenient conductive clip; the convenient conductive clips on each external cable 6 electrically connected to the magnetic latching relay array are used to electrically connect to each ribbon cable of the DIP switch of the RZB type borehole strain gauge, and the convenient conductive clips on each external cable 6 electrically connected to the signal acquisition circuit are used to electrically connect to the voltage output cable of the middle plate of the differential capacitive displacement sensor.

[0016] The various convenient conductive clips allow for quick and easy electrical connection of the external cables 6 to the cables 14 to be pierced, achieving the electrical connection of all signals required for zeroing the RZB borehole strain gauge. The magnetic latching relay array enables the selection of the external cables 6, achieving the same on / off connection function as manual DIP switches, and the magnetic latching relay array can achieve rapid on / off control under the controller's control. The communication module facilitates network connection, allowing the controller to receive remote control commands without requiring manual on-site zeroing operations, improving the convenience and timeliness of zeroing. The signal acquisition circuit can acquire voltage signals in real time, enabling zeroing operation when the voltage of the intermediate plate of the differential capacitive displacement sensor exceeds the set range, quickly restoring the voltage value to the set range and ensuring the reliability of the differential capacitive displacement sensor monitoring.

[0017] Furthermore, such as Figure 4 and 5 As shown, the magnetic latching relay array consists of 160 switch modules arranged in 10 rows and 16 columns. Each switch module comprises a driver chip and a magnetic latching relay. The two output terminals of the driver chip are electrically connected to the two ends of the corresponding magnetic latching relay coil. One input terminal of the driver chip of each switch module in the same row is electrically connected to the same input / output terminal of the controller, and the other input terminal of the driver chip of each switch module in the same column is electrically connected to the same input / output terminal of the controller. The stationary and moving contacts of each magnetic latching relay are electrically connected to the respective external cables 6 on the connector 5. Figure 1 Not all external cables 6 and convenient conductive clips are shown in the diagram.

[0018] Each column of the magnetic latching relay array contains ten magnetic latching relays, representing one bit of a component of the ratio transformer, and also corresponding to one DIP switch. The row and column driver chips are connected to the GPIO (input / output) pins of the microcontroller. The controller can control the state of a specified magnetic latching relay by controlling the output state of the pins of a specified row and column. By scanning the rows and columns, the circuit design can be simplified and the hardware cost reduced. The driver chip can control the on / off state of the coil of the magnetic latching relay, thereby realizing the opening and closing of the stationary and moving contacts of the magnetic latching relay, thus realizing the same function of each DIP switch.

[0019] Furthermore, the convenient conductive clamp includes a strip base 8, a clamping bending rod 12, a clamping spring 11, and a conductive needle 7; the middle part of the clamping bending rod 12 is pivotally hinged to the strip base 8 via a hinge seat 10; a cable positioning seat 13 is provided on the opposite side of the clamping end of the strip base 8 and the clamping bending rod 12, and an arc-shaped limiting groove is provided on the opposite side of the two cable positioning seats 13; the clamping spring 11 is elastically supported between the strip base 8 and the clamping bending rod 12, and is used to push the strip base 8 and the clamping end of the clamping bending rod 12 to clamp each other; one end of the conductive needle 7 is fixed on the hinge seat 10, and the other end is set as a spike end, and the spike end extends between the two cable positioning seats 13, and is used to penetrate the cable 14 to be pierced.

[0020] The clamping spring 11 pushes the strip base 8 and the clamping end of the clamping bending rod 12 to clamp each other, thereby pressing the wire core in the cable to be pierced 14 onto the conductive needle 7, thus achieving a stable and reliable conductive connection without cutting each cable to be pierced 14 and maintaining the existing wiring of the RZB type drilling strain gauge; the arc-shaped limiting groove can clamp and limit the cable to be pierced 14, thereby ensuring the stability of the conductive contact between the wire core and the conductive needle 7.

[0021] Furthermore, an adhesive layer 9 is provided on the side of the strip base 8. The adhesive layer 9 allows for easy attachment and fixation of the various convenient conductive clips, further ensuring the stability of conductive contact.

[0022] Furthermore, a maintenance window is provided on the front side of the control box 1, and a closed door 2 is hinged to the maintenance window; a door handle 3 is provided on the closed door 2. The closed door 2 facilitates the later maintenance of the device.

[0023] Furthermore, each of the left and right sides of the control box 1 is provided with a strip-shaped heat dissipation vent, and a water-blocking strip 4 extends from the upper side of the strip-shaped heat dissipation vent. The strip-shaped heat dissipation vent facilitates heat dissipation of the control box 1.

[0024] The remote zeroing device for the RZB type borehole strain gauge disclosed in this utility model uses an STM32FXX series embedded microcontroller as the controller. The STM32 series microcontroller is characterized by its high cost-effectiveness and low power consumption. Its excellent computing performance, advanced interrupt response system, and abundant on-chip resources fully meet the real-time, low-power, and low-cost requirements of this project. The magnetic latching relay is a single-coil magnetic latching relay, which switches the contact state through a pulse current (forward or reverse) of a single coil. It retains its state even after power failure, featuring a simple structure, small size, and low power consumption, making it suitable for PCB layout and circuit control in small spaces. The driver chip is a BL8023C model, which applies the controller's control signal to the coil of the magnetic latching relay to achieve relay switching action. The communication module is an Ethernet communication module composed of an Ethernet control chip, model W5500. The W5500 chip is an integrated hardware TCP / IP... The embedded Ethernet controller in the protocol stack is also an industrial-grade Ethernet control chip, using a 3V3 power input to ensure stable data transmission and reception. The signal acquisition circuit adopts an existing analog signal acquisition circuit, mainly including an amplifier circuit, a detector circuit, a filter circuit, and an ADC acquisition circuit. The ADC acquisition circuit uses an ADS1115 ADC conversion chip for voltage sampling. The ADS1115 is a high-precision, low-power 16-bit analog-to-digital converter (ADC) that supports multiple voltage input ranges and has flexible configuration options. Its default sampling voltage is ±2.048V.

[0025] In use, the remote zeroing device for the RZB type borehole strain gauge disclosed in this utility model first connects each external cable 6 to the corresponding cable 14 to be pierced through each convenient conductive clip, and records the electrical connection objects of each external cable 6. For example, the electrical connection objects of the first and second external cables 6 are the two pins of the first DIP switch of the first DIP switch of the north-south zeroing DIP switch group; the electrical connection objects of the eighty-first and eighty-second external cables 6 are the two pins of the first DIP switch of the first DIP switch of the east-west zeroing DIP switch group; and the electrical connection objects of the 159th and 160th external cables 6 are the two voltage output terminals of the middle plate of the differential capacitive displacement sensor. Then, the convenient conductive clips are glued and fixed through the adhesive layer 9.

[0026] After completing all the convenient conductive clamp connections, the controller acquires the voltage output value of the middle plate of the differential capacitive displacement sensor through the signal acquisition circuit at the set acquisition frequency. This value is the unbalanced voltage signal to ground, U0. The controller then sends the current unbalanced voltage signal to ground, U0, to the host computer through the communication module and receives array control information from the host computer in real time. The array control information is calculated and set by the host computer staff based on the received unbalanced voltage signal to ground, U0. The controller receives the array control information through the communication module and sends corresponding control commands to each driver chip according to the array control information.

[0027] When controlling the driver chip, first determine the row where the driver chip is located, and then send commands to the corresponding input / output pins (e.g., ...) of that row. Figure 5 The system sends control signals to the GPIOA (Government Input / Output Controller) pins, determines the column of the driver chip, and then sends signals to the corresponding input / output pins (e.g., GPIOA pins) of that column. Figure 5 The control signal is sent to the GPIOB in the magnetic latching relay array to realize the control of one driver chip; the above control process is performed for each driver chip that needs to be controlled, and finally the control of each driver chip that needs to be adjusted in the magnetic latching relay array is completed to realize the adjustment operation.

[0028] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A remote zeroing device for a RZB type borehole strainmeter, characterized in that: Includes a control box (1), a communication module, a memory, a controller, a magnetic latching relay array, a signal acquisition circuit, various external cables (6), and various convenient conductive clips; The communication module, memory, controller, magnetic latching relay array, and signal acquisition circuit are all housed in the control box (1). The controller is electrically connected to the communication module, memory, magnetic latching relay array, and signal acquisition circuit, respectively. A connector (5) is provided on the side wall of the control box (1). The magnetic latching relay array and signal acquisition circuit are electrically connected to the connector (5). One end of each external cable (6) is electrically connected to the connector (5), and the other end of each external cable (6) is electrically connected to each convenient conductive clip. The convenient conductive clips on each external cable (6) electrically connected to the magnetic latching relay array are used to electrically connect to each ribbon cable of the DIP switch of the RZB type borehole strain gauge. The convenient conductive clips on each external cable (6) electrically connected to the signal acquisition circuit are used to electrically connect to the voltage output cable of the middle plate of the differential capacitive displacement sensor.

2. The remote zeroing device for RZB type borehole strainmeter according to claim 1, characterized in that: The magnetic latching relay array is a switch array consisting of 160 switch modules in 10 rows and 16 columns. Each switch module consists of a driver chip and a magnetic latching relay. The two output terminals of the driver chip are electrically connected to the two ends of the corresponding magnetic latching relay coil. One input terminal of the driver chip of each switch module in the same row is electrically connected to the same input / output terminal of the controller. The other input terminal of the driver chip of each switch module in the same column is electrically connected to the same input / output terminal of the controller. The stationary and moving contacts of each magnetic latching relay are electrically connected to the respective external cables (6) on the connector (5).

3. The remote zeroing device for an RZB type borehole strain gauge according to claim 1, characterized in that: The convenient conductive clamp includes a strip base (8), a clamping bending rod (12), a clamping spring (11), and a conductive needle (7). The middle part of the clamping bending rod (12) is mounted on the strip base (8) by a hinge seat (10). A cable positioning seat (13) is provided on the opposite side of the clamping end of the strip base (8) and the clamping bending rod (12), and an arc-shaped limiting groove is provided on the opposite side of the two cable positioning seats (13). The clamping spring (11) is elastically supported between the strip base (8) and the clamping bending rod (12) to push the clamping end of the strip base (8) and the clamping bending rod (12) to clamp each other. One end of the conductive needle (7) is fixed on the hinge seat (10), and the other end is set as a spike end, and the spike end extends between the two cable positioning seats (13) to penetrate the cable (14) to be pierced.

4. The remote zeroing device for an RZB type borehole strain gauge according to claim 3, characterized in that: An adhesive layer (9) is provided on the side of the strip base (8).

5. The remote zeroing device for an RZB type borehole strain gauge according to claim 1, characterized in that: The control box (1) has an inspection window on its front side and a closed door (2) is hinged to the inspection window; a door handle (3) is provided on the closed door (2).

6. The remote zeroing device for an RZB type borehole strain gauge according to claim 1, characterized in that: Each strip-shaped heat dissipation port is provided on the left and right sides of the control box (1), and a water baffle (4) is extended from the upper side of the strip-shaped heat dissipation port.

Images