A pneumatic shock source control system and method thereof

Abstract

The present invention provides a pneumatic shock source control system and method. A main controller detects the acceleration value fed back by a shock sensor during the shock mechanism's impact. When the acceleration value exceeds a set acceleration threshold, the pneumatic shock source is controlled to enter a recovery process. After all tasks within the pneumatic shock source's scheduled mission have been completed, the system returns to a standby state. The present invention utilizes the shock signal output by a shock sensor attached to the shock hammer for feedback, forming a closed-loop control system that effectively avoids secondary shocks.

Description

Technical Field

[0001] The present invention belongs to the technical field of pneumatic shock source control, and relates to a pneumatic shock source control system and method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In tunnel advance prediction systems, due to space limitations, it is impossible to use large seismic wave generating equipment used in ground survey systems, such as seismic vehicles. To adapt to the tunnel environment, artificial vibration and hydraulic vibration methods are usually used.

[0004] The artificial vibration method involves a person manually striking the tunnel wall with a sledgehammer to generate a vibration source. A vibration sensor attached to the sledgehammer generates a detected vibration signal, which is then collected by an instrumentation system and used as a reference signal. While this method is simple, the energy of the manually generated vibration wave is low, the impact force is highly discrete, and the signal-to-noise ratio of the signal collected by the associated acquisition system is low, making it unsuitable for direct data consistency comparison and hindering subsequent data processing and analysis.

[0005] Hydraulic seismic methods are powered by hydraulic oil, which comes from the existing hydraulic systems of engineering equipment such as shield machines and TBMs. The oil supply to the hydraulic seismic system is a branched oil pipeline, resulting in unstable or insufficient hydraulic pressure, making targeted hydraulic pressure adjustment nearly impossible. Furthermore, the high viscosity of hydraulic oil and the high resistance of the pipelines result in a slow response to power transmission from the hydraulic oil system, limiting the speed of the seismic hammer and resulting in insufficient impact force. The resulting seismic wave energy is suboptimal, hindering subsequent seismic signal processing. Furthermore, the presence of hydraulic fluid and the heavy weight of the hydraulic oil system make equipment maintenance and component replacement difficult.

[0006] High-pressure gas offers fast response and low resistance in gas pipelines. Furthermore, the high-pressure gas is supplied by a dedicated high-pressure air pump, and the pressure can be easily adjusted over a wide range using a pressure regulator, ranging from 2 to 6 bar or even higher. These advantages allow gas-driven hammers to generate much higher velocities than hydraulic systems, significantly improving the signal-to-noise ratio of the seismic wave signals generated, facilitating subsequent data processing and analysis. Furthermore, pneumatic systems are lighter than hydraulic systems and are free from the effects of hydraulic oil, making them easier to maintain and replace.

[0007] Of course, the high-pressure gas shock system has inherent defects, such as the large gas volume compression ratio, which requires a long time to store gas; for example, the gas reaction speed is fast, and the shock hammer produces secondary shocks. Summary of the Invention

[0008] In order to solve the above problems, the present invention proposes a pneumatic shock source control system and method. The present invention uses the shock signal output by the shock sensor fixed on the shock hammer for feedback to form a closed-loop control system, which can effectively avoid the occurrence of secondary shock phenomenon.

[0009] According to some embodiments, the present invention adopts the following technical solutions:

[0010] A pneumatic shock source control system includes a pneumatic shock source, a main controller, a shock source mechanism, and a shock source sensor. The main controller is connected to the pneumatic shock source and the shock source sensor to control the pneumatic shock source to use compressed gas as a power source to provide an impact force to the shock source mechanism.

[0011] The shock sensor is set on the shock mechanism. The main controller detects the acceleration value fed back by the shock sensor during the impact of the shock mechanism. When the acceleration value exceeds the set acceleration threshold, the pneumatic shock exciter is controlled to enter the recovery process until all task processes in the scheduled tasks of the pneumatic shock exciter have been completed and the standby state is restored.

[0012] As an optional implementation, the vibration excitation mechanism is multi-channel, and each vibration excitation mechanism can be controlled individually.

[0013] As an optional implementation, the shock mechanism is a shock hammer, and the sensitive direction of the shock sensor is consistent with the extension and contraction direction of the shock hammer.

[0014] As an optional embodiment, the main controller has at least N+1 analog signal input channels, where N is the number of vibration excitation mechanisms and 1 is the manual / pneumatic mode switching control port. The main controller controls the switching of each analog signal input channel, and the main controller has at least one analog output signal channel.

[0015] Furthermore, the main controller and the host computer communicate through a communication interface, which is used to receive the working parameters of the vibration system configured by the host computer, and to receive the selection instructions of the working mode. When it is in the artificial vibration mode, the artificial vibration signal is transmitted to other devices through the analog output signal channel. When it is switched to the pneumatic vibration mode, the pneumatic vibration signal being vibrated is transmitted to other devices through the analog output signal channel.

[0016] The working parameters include help command, air storage time, hysteresis time, impact time, shock sensor channel zero time, recovery time, pneumatic shock / artificial shock mode, shock sensor trigger threshold and reading current setting value.

[0017] As an optional embodiment, the main controller is configured to have a signal filtering function. When a selection / control operation instruction is received and the operation instruction is maintained continuously for a time greater than a set time, the operation instruction is determined to be valid; when multiple operation instructions are input simultaneously within the same time period, all operation instructions are considered invalid; when there is a valid operation instruction at the current moment, and a new operation instruction is input while executing the corresponding pneumatic shock operation process, the subsequent operation instruction is considered invalid.

[0018] As an optional implementation, the main controller is configured with an operation panel, and the operation panel is configured with a plurality of selection keys or buttons.

[0019] As an optional embodiment, the pneumatic vibrator includes a vibrating hammer controller, which includes multiple pneumatic solenoid valves, impact cylinders and air pipelines. The main controller provides driving power to each pneumatic solenoid valve through different relays, and the negative ends of all pneumatic solenoid valve drive coils are connected together and connected to the common end of the solenoid valve power supply;

[0020] The pneumatic solenoid valves are respectively a pneumatic solenoid valve for exhausting, a pneumatic solenoid valve for impacting and a pneumatic solenoid valve for storing air;

[0021] The pneumatic battery valves respectively control the connection paths between the impact cylinder and the air source, and each connection path is established by an air pipeline.

[0022] As a further step, when the pneumatic solenoid valve for exhaust is energized and closed, the exhaust port is closed, the exhaust cavity in the impact cylinder begins to accumulate gas and pushes the shock mechanism to recover;

[0023] When the pneumatic solenoid valve for storing air is energized and closed, the high-pressure air source inflates the air storage cavity in the impact cylinder;

[0024] When the pneumatic solenoid valve used for shock is energized and closed, the high-pressure gas source inflates the shock cavity in the shock cylinder, and the shock mechanism rushes out quickly to complete the shock action;

[0025] When the above-mentioned pneumatic solenoid valves are all in the released state, the cavities in the impact cylinders are connected to the external atmosphere through the corresponding pneumatic solenoid valves.

[0026] As an optional embodiment, the main controller is configured to release the pneumatic solenoid valve used for exhaust in advance before the shock mechanism starts to impact, and after a delay according to the value of the lag time parameter, the main controller then closes the pneumatic solenoid valve used for impact. The lag time parameter is related to the high-pressure gas pressure, the shock hammer stroke, the ambient temperature and the hardness of the tunnel wall rock, and the optimal value is obtained through experiments.

[0027] As an optional embodiment, the main controller is configured to compare real-time acceleration data with the setting value of the shock sensor trigger threshold parameter. When the comparison result is greater than or equal to, the main controller immediately controls the pneumatic solenoid valve used for exhaust to be energized and close the exhaust, and the high-pressure air source inflates the exhaust cavity to reversely push the shock hammer; at the same time, the main controller controls the pneumatic solenoid valve used for impact and the pneumatic solenoid valve used for air storage to close, and the air storage cavity and the impact cavity are connected to the external atmosphere for pressure relief.

[0028] A working method of a pneumatic shock source control system includes a main controller detecting the acceleration value fed back by a shock sensor during the impact process of a shock mechanism. When the acceleration value exceeds a set acceleration threshold, the pneumatic shock source is controlled to enter a recovery process until all task processes in the pneumatic shock source's scheduled tasks have been completed, and then the standby state is restored.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention fixes the shock sensor to the shock hammer. When the shock hammer begins to move forward, the acceleration from a stationary state to rapid movement is very large, comparable to the impact acceleration. Only a very small amount of energy is transmitted to the tunnel wall through a complex path, which can be regarded as environmental noise and has no impact on data collection and analysis.

[0031] The present invention cooperates with a main controller and multiple pneumatic solenoid valves. If the gas pressure in the compressed air storage chamber and the impact chamber is less than the recoil pressure of the shock hammer and the continuously increasing air pressure in the exhaust chamber, the shock hammer will be retracted into the shock hammer controller; if the gas pressure in the compressed air storage chamber and the impact chamber is greater than the recoil pressure of the shock hammer and the continuously increasing air pressure in the exhaust chamber, the speed of the shock hammer will be reduced to zero before it contacts the tunnel wall, and then it will move toward the shock hammer controller and be retracted under the action of the gas pressure in the exhaust chamber, without secondary impact or tertiary impact, and without a shock waveform with secondary impact or tertiary impact.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 This is the logic block diagram of the pneumatic shock source control system;

[0035] Figure 2This is the principle diagram of the pneumatic shock source control system;

[0036] Figure 3 This is the schematic diagram of the analog signal channel for the pneumatic shock source control system;

[0037] Figure 4 This is the pneumatic solenoid valve drive principle diagram of the pneumatic shock source control system;

[0038] Figure 5 This is the pneumatic shock source control system pneumatic shock source gas circuit principle diagram;

[0039] Figure 6 This is the power supply schematic diagram of the pneumatic shock source control system;

[0040] Figure 7 It is a schematic diagram of the secondary shock waveform;

[0041] Figure 8 Schematic diagram of three-impact shock waveform;

[0042] Figure 9 This is a schematic diagram of the shock waveform without secondary impact;

[0043] Figure 10 This is a diagram showing help instructions. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] like Figure 1As shown, a pneumatic shock source control system includes a main controller and a pneumatic shock source. The system uses compressed gas as a power source, and the pneumatic shock controller controls the impact of the pneumatic shock hammer as a shock source; a shock sensor is fixed on each pneumatic shock hammer, and the main controller detects the acceleration value fed back by the shock sensor during the shock hammer impact process in real time. When the acceleration value exceeds the set acceleration threshold, the pneumatic shock hammer controller is immediately controlled to enter the deflation recovery process until all processes of the pneumatic shock controller are completed and the standby state is restored.

[0048] It also includes an operation panel. In this embodiment, the operation panel has 6 self-resetting buttons, which are divided into two groups: 3 are right-side shock start buttons, and the other 3 are left-side shock start buttons; each button has an LED status indicator to indicate the status of the pneumatic shock process.

[0049] In this embodiment, the main controller includes 6 button status input ports, 6 LED status indicator output ports, 1 RS485 communication port, 18 pneumatic solenoid valve switch output ports, 3 analog channel switching control logic ports, 6 analog signal input interfaces, 1 ADC analog-to-digital conversion input port, 1 analog output port, 1 manual / pneumatic mode switching control port, a data storage device, etc.

[0050] The main controller communicates with the host computer through the RS485 communication port, can upload the working parameters saved in the data storage, and can also receive the working parameters sent by the host computer and save them in the data storage.

[0051] In this embodiment, the pneumatic shock exciter is composed of three parts: a shock hammer controller, a shock hammer, and a shock sensor; each shock hammer controller is mainly composed of three pneumatic solenoid valves, an impact cylinder, and an air pipeline; the shock sensor is fixed on the shock hammer, and the sensitive direction of the shock sensor is consistent with the extension and retraction direction of the shock hammer.

[0052] Of course, in other embodiments, the layout and number of the above components can be adjusted according to specific circumstances.

[0053] In this embodiment, the operation panel, such as Figure 2 As shown, when a button on the operation panel is pressed, the main controller detects the button pressing through the button status input port and when the detection is determined to be valid, the main controller emits a short "beep" prompt sound and outputs the corresponding indication status through the LED status indicator output port.

[0054] The LED indicator states are divided into standby, charging, shock, and recovery. The LED status indicator is off in standby mode. During the charging phase, the LED status indicator flashes for a short period of time, with each indicator on and off for 50% of the time. During the shock hammer impact phase, the LED status indicator is constantly on, and a short beep sounds at the start of the shock hammer impact phase. During the recovery phase, the LED status indicator is constantly on, and at the end of the recovery phase, three short beeps sound, and the LED status indicator turns off, entering standby mode.

[0055] To prevent misoperation, the main controller implements measures such as button debounce, long-press validation, multi-key button disabling, and button lockout. Debounce and long-press validation require that a button must be held down for at least three seconds without being released within that period, otherwise the button operation will be invalid. Multi-key button disabling means that if more than one button is pressed during the button debounce process, the button operation will be invalid. Button lockout disables all button operations if a button is detected to be valid and the pneumatic shock process is already in progress.

[0056] The above multi-button operation and button lock period button operation must release all buttons after the main controller transitions to the standby state and re-perform button operation detection.

[0057] Similarly, in other embodiments, the settings of the above parameters, prompting methods, display methods, etc. can be adjusted or changed according to personal usage habits or standards.

[0058] The pneumatic vibrators in this embodiment are divided into two groups: left-side pneumatic vibrators and right-side pneumatic vibrators.

[0059] Each set of pneumatic vibrators contains 3 sets of vibration controllers, 3 sets of vibration hammers and 3 vibration sensors. The left pneumatic vibrator and the right pneumatic vibrator contain a total of 6 sets of vibration controllers, 6 sets of vibration hammers and 6 vibration sensors.

[0060] like Figure 5 As shown, each shock hammer controller includes three pneumatic solenoid valves: exhaust pneumatic solenoid 1DT, impact pneumatic solenoid 2DT, air storage pneumatic solenoid 3DT, as well as a cylinder and an air circuit.

[0061] like Figure 6 As shown in the figure, the working power supply of this system is mainly divided into two parts: 24V solenoid valve power supply and 24V relay power supply.

[0062] The AC / DC power module M1 outputs +24V, which provides +24V solenoid valve power for the pneumatic vibrator.

[0063] AC / DC power module M2 outputs +24V, which is divided into three paths. One path provides the +24V relay power for relays J1, J2, and J3. Another path provides ±5V sensor power through DC / DC power module M3, with its power supply common terminal connected to the common terminal of M2's output power supply. Another path provides ±5V analog power through DC / DC power module M4. The +5V analog power is then stepped down by an LDO to produce a +3.3V digital power supply.

[0064] The AC / DC power modules M1 and M2 are powered by a 220V, 50Hz AC power supply. These two 24V power supplies are used separately and independently of the common ground reference to improve the system's electromagnetic compatibility. This separation of power supplies, along with the isolation between the input, intermediate, and output stages of the analog signal path, also improves the analog signal-to-noise ratio.

[0065] like Figure 4 As shown, for each shock hammer controller, the main controller provides +24V driving power to the above three pneumatic solenoid valves through three relays, and the negative ends of the driving coils of the three pneumatic solenoid valves are connected together and connected to the common end of the solenoid valve power supply.

[0066] When relay J1 is energized, relay J2 is released, and relay J3 is released, pneumatic solenoid valve 1DT is energized and energized, thereby closing the exhaust port. The exhaust cavity in the impact cylinder begins to accumulate air and pushes the shock hammer to retract. When relay J1 is energized, relay J2 is released, and relay J3 is energized, pneumatic solenoid valve 3DT is energized and energized, and the high-pressure air source inflates the air storage cavity in the impact cylinder. When relay J1 is released, relay J3 is energized, and relay J2 is energized, pneumatic solenoid valve 2DT is energized and energized, and the high-pressure air source inflates the impact cavity in the impact cylinder. The shock hammer quickly rushes out to complete the shock action. When the above-mentioned pneumatic solenoid valves are in the released state, the cavities in the impact cylinder are connected to the external atmosphere through the pneumatic solenoid valves.

[0067] Before the hammer rapidly thrusts out, after the pneumatic solenoid valve 1DT is released, high-pressure gas remains in the exhaust chamber. It takes time for the gas pressure to drop to the same level as the external atmospheric pressure. After the pneumatic solenoid valve 2DT is closed, a high-pressure gas source injects high-pressure gas into the impact chamber. This high-pressure gas, combined with the high-pressure gas in the gas storage chamber, provides the propulsion force that propels the hammer. If the gas pressure in the exhaust chamber is high, it will hinder the hammer's movement, reducing the hammer's impact force and the signal-to-noise ratio of the seismic waves generated by the shock.

[0068] The lower the gas pressure in the exhaust chamber, the more beneficial it is for the hammer's ultimate kinetic energy. During the accumulation phase, gas pressure must remain in the exhaust chamber to keep the hammer stationary, and this pressure persists until the impact chamber is inflated, propelling the hammer into motion. That is, at the moment the hammer begins to impact, the release of 1DT exhaust and the engagement of 2DT impact inflation inevitably affect the hammer's impact. Therefore, finding a balance between maintaining a certain gas pressure in the exhaust chamber and minimizing it is crucial to achieve the optimal impact.

[0069] The hysteresis time parameter in this embodiment is an operating parameter that achieves this balance. Before the hammer begins impact, the main controller releases pneumatic solenoid valve 1DT to vent air. After a delay equal to the hysteresis time parameter, the main controller then closes pneumatic solenoid valve 2DT. The hysteresis time parameter is optimized through experimentation based on the high-pressure gas pressure, hammer stroke, ambient temperature, and the hardness of the tunnel rock.

[0070] like Figure 5 As shown, 1 is the gas pressure regulating valve, and below it is the high-pressure gas source. The gas pressure regulating valve can be adjusted within the pressure range provided by the high-pressure gas source. For a pneumatic hammer to reach a certain speed from a standstill, it must overcome the friction of the impact cylinder and ensure sufficient impact force. A typical minimum pressure is 2 bar, and the gas pressure can be adjusted up to 6 bar, or adjusted based on site conditions. Higher pressures depend on the pressure provided by the high-pressure gas source, but excessive pressures place higher demands on the performance of the hammer controller accessories. After impacting the tunnel wall, a pneumatic hammer will rebound, resulting in secondary or even tertiary impacts. This is because the rebound force acting on the hammer during impact compresses and accumulates energy in the gas storage chamber and impact chamber within a short period of time. When the stored energy pressure exceeds the rebound force, the hammer will move toward the tunnel wall again, producing a secondary or even tertiary impact.

[0071] The time interval between the first impact and the second impact is between tens of milliseconds and 200 milliseconds. The greater the gas pressure, the shorter the time interval. The shock energy caused by the second impact is less than the shock energy of the first impact. Figure 7 、 Figure 8 As shown in the figure, the response waveforms of the seismic waves generated by the secondary and tertiary shocks in the geological body are superimposed on the response waveforms of the seismic waves generated by the first shock in the geological body, causing interference, reducing the signal-to-noise ratio and undermining the accuracy of data analysis. They are harmful signals and must be eliminated.

[0072] The solution of the present invention is that, ignoring the deformation of the tunnel wall, the moment the shock hammer contacts the tunnel wall is the moment of maximum velocity and the moment when the velocity instantly decreases to zero, so the absolute value of the acceleration is the maximum moment. The main controller compares the data obtained by ADC analog-to-digital conversion with the trigger threshold parameter setting value of the shock sensor in real time. When the comparison result is greater than or equal to, it is considered that the current shock hammer has impacted the tunnel wall. The main controller immediately causes relay J1 to attract, and the pneumatic solenoid valve 1DT is energized to close the exhaust. The high-pressure air source inflates the exhaust chamber to reverse the shock hammer. At the same time, the main controller releases relays J2 and J3 to close pneumatic solenoid valves 2DT and 3DT, and the air storage chamber and the impact chamber are connected to the external atmosphere for pressure relief (it takes time to reduce the air pressure in the chamber). The recoiled shock hammer quickly compresses the gas in the air storage chamber and the impact chamber. During this process, the air storage chamber and the impact chamber are already connected to the external atmosphere.

[0073] If the compressed gas pressure in the gas storage chamber and the impact chamber is less than the recoil pressure of the shock hammer and the increasing gas pressure in the exhaust chamber, the shock hammer will be retracted into the shock hammer controller.

[0074] If the compressed gas pressure in the gas storage chamber and the impact chamber is greater than the recoil pressure of the shock hammer and the increasing gas pressure in the exhaust chamber, the shock hammer will move toward the tunnel wall again. During this movement, the gas in the exhaust chamber is compressed to increase the internal gas pressure, and the gas source continues to inflate the exhaust chamber through 1DT. The gas storage chamber and the impact chamber are also continuously releasing pressure to the external atmosphere to continuously reduce the internal gas pressure, so that the speed of the shock hammer is reduced to zero before it contacts the tunnel wall. Afterwards, under the action of the gas pressure in the exhaust chamber, it moves toward the shock hammer controller and retracts. There will be no secondary or tertiary impact. The shock waveform without secondary or tertiary impact is as follows Figure 9 shown.

[0075] The overall control process of this system involves attaching a vibration sensor to a vibration hammer. When the vibration hammer begins to move forward, the acceleration from a stationary state to rapid movement is very high, comparable to the impact acceleration. However, only a minimal amount of energy is transferred to the tunnel wall through a complex path, which can be considered ambient noise and does not affect data collection and analysis.

[0076] Avoiding the aforementioned vibration effects of the hammer's activation is beneficial, and the shock sensor channel zero-time parameter addresses this effect. Its operating principle is as follows: When the pneumatic solenoid valve 2DT activates, the main controller delays according to the shock sensor channel zero-time parameter setting. When the delay expires, the main controller outputs a control signal through the analog channel switching control logic port to switch the analog channel. This inputs the analog signal from the shock sensor attached to the currently operating hammer into the main controller, thus avoiding the vibration generated by the hammer's activation.

[0077] like Figure 3 As shown in the figure, using the hammer controller 1 operating the left pneumatic vibrator as an example, the signal from the vibration sensor 1 passes through the analog signal conditioning circuit. The output signal is isolated and then transmitted to the analog switch. The analog switch then outputs the signal to the 50Hz notch filter and bandpass filter for filtering. This suppresses interference from the power frequency signal and signals outside the effective bandwidth to improve the signal-to-noise ratio. The output signal is divided into two paths. One signal passes through the OPA buffer and isolation before being transmitted to the analog signal output interface. The other signal is modulated with a bias voltage and output to the main controller's ADC for analog-to-digital conversion.

[0078] The main controller communicates with the host computer through the RS485 communication port, can receive the working parameters sent by the host computer and work according to the working parameters, including help command, gas storage time, hysteresis time, impact time, shock sensor channel zero time, recovery time, pneumatic shock / artificial shock mode, shock sensor trigger threshold, reading the current setting value, etc. Figure 10 shown.

[0079] Help command (help): displays the command format and parameter range of available working parameters;

[0080] Pump time: The time it takes for the pneumatic shock stimulator to open the charging solenoid valve to charge the air, which can be set from 1 second to 15 seconds.

[0081] Lag time: The time when the shock hammer impact solenoid valve starts lags behind the time when the bleed solenoid valve opens in advance. It can be set from 0 milliseconds to 500 milliseconds.

[0082] Beat time: The delay time after the pneumatic shock hammer strikes the solenoid valve, which can be set from 100 milliseconds to 5 seconds.

[0083] Zero time of shock sensor channel (zerotime): After the start time delay of shock hammer impacting solenoid valve, it switches to the currently operated shock sensor input analog channel, transmits it to the main controller ADC analog-to-digital conversion input port, and outputs the signal from the analog signal output port as the signal source for other devices. The delay time can be set from 10 milliseconds to 200 milliseconds.

[0084] Recovery time (resettime): The time it takes for the reset solenoid valve to open after the shock hammer has completed its impact to allow the pneumatic hammer to retract. It can be set from 1 second to 15 seconds.

[0085] Pneumatic shock / manual shock mode (channel): Parameter is 1-pneumatic mode, 0-manual mode;

[0086] The trigger threshold of the shock sensor (threshold): The full scale of the shock sensor is 100%, and it can be set between 1% and 100%;

[0087] Read current setting value (default): Read current working parameters from the data memory and transmit them to the host computer via RS485.

[0088] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A pneumatic shock source control system, characterized in that: The pneumatic vibrator comprises a pneumatic vibrator, a main controller, a vibrating mechanism and a vibrating sensor, wherein the main controller is connected to the pneumatic vibrator and the vibrating sensor to control the pneumatic vibrator to use compressed gas as a power source to provide impact force to the vibrating mechanism; The shock sensor is set on the shock mechanism. The main controller detects the acceleration value fed back by the shock sensor during the shock mechanism's impact process. When the acceleration value exceeds the set acceleration threshold, the pneumatic shock exciter is controlled to enter the recovery process until all task processes in the pneumatic shock exciter's scheduled tasks have been completed and then the standby state is restored; The vibration excitation mechanism is multi-channel, and each vibration excitation mechanism can be controlled separately; The shock mechanism is a shock hammer, and the sensitive direction of the shock sensor is consistent with the extension and contraction direction of the shock hammer; The main controller is configured to compare the real-time acceleration data with the setting value of the trigger threshold parameter of the shock sensor. When the comparison result is greater than or equal to, the main controller immediately controls the pneumatic solenoid valve used for exhaust to be energized and close the exhaust, and the high-pressure air source inflates the exhaust cavity to reversely push the shock hammer; at the same time, the main controller controls the pneumatic solenoid valve used for impact and the pneumatic solenoid valve used for air storage to be closed, and the air storage cavity and the impact cavity are connected to the external atmosphere for pressure relief.

2. A pneumatic shock source control system according to claim 1, characterized in that: The main controller has at least N+1 analog signal input channels, where N is the number of vibration excitation mechanisms and 1 is the manual / pneumatic mode switching control port. The main controller controls the switching of each analog signal input channel and has at least one analog output signal channel.

3. A pneumatic shock source control system as claimed in claim 2, characterized in that: The main controller communicates with the host computer via a communication interface, and is used to receive the operating parameters of the vibration system configured by the host computer, and is used to receive the selection instruction of the working mode. When the vibration mode is manual, the manual vibration signal is transmitted to other devices through the analog output signal channel. When the vibration mode is switched to pneumatic vibration, the pneumatic vibration signal in progress is transmitted to other devices through the analog output signal channel. Or further, the working parameters include help command, air storage time, lag time, impact time, shock sensor channel zero time, recovery time, pneumatic shock / artificial shock mode, shock sensor trigger threshold and reading current setting value.

4. A pneumatic shock source control system according to claim 1, 2 or 3, characterized in that: The main controller is configured to have a signal screening function. When a selection / control operation instruction is received and the operation instruction is maintained continuously for a time greater than the set time, the operation instruction is determined to be valid; when multiple operation instructions are input simultaneously within the same time period, all operation instructions are considered invalid; when there is a valid operation instruction at the current moment, and a new operation instruction is input while executing the corresponding pneumatic shock operation process, the subsequent operation instructions are considered invalid.

5. The pneumatic shock source control system according to claim 1, characterized in that: The pneumatic vibrator includes a vibrating hammer controller, which includes multiple pneumatic solenoid valves, impact cylinders and air pipelines. The main controller provides driving power to each pneumatic solenoid valve through different relays. The negative ends of all pneumatic solenoid valve drive coils are connected together and connected to the common end of the solenoid valve power supply. The pneumatic solenoid valves are respectively a pneumatic solenoid valve for exhausting, a pneumatic solenoid valve for impacting and a pneumatic solenoid valve for storing air; The pneumatic battery valves respectively control the connection paths between the impact cylinder and the air source, and each connection path is established by an air pipeline.

6. A pneumatic shock source control system as claimed in claim 5, characterized in that: When the pneumatic solenoid valve used for exhaust is energized and closed, the exhaust port is closed, the exhaust cavity in the impact cylinder begins to accumulate gas and pushes the shock mechanism to recover; When the pneumatic solenoid valve for storing air is energized and closed, the high-pressure air source inflates the air storage cavity in the impact cylinder; When the pneumatic solenoid valve used for shock is energized and closed, the high-pressure gas source inflates the shock cavity in the shock cylinder, and the shock mechanism rushes out quickly to complete the shock action; When the above-mentioned pneumatic solenoid valves are all in the released state, the cavities in the impact cylinders are connected to the external atmosphere through the corresponding pneumatic solenoid valves.

7. A pneumatic shock source control system according to claim 1, 2 or 3, characterized in that: The main controller is configured to release the pneumatic solenoid valve used for exhaust in advance before the shock mechanism starts to impact, and after a delay according to the value of the lag time parameter, the main controller then closes the pneumatic solenoid valve used for impact. The lag time parameter is related to the high-pressure gas pressure, the shock hammer stroke, the ambient temperature and the hardness of the tunnel wall rock, and the optimal value is obtained through experiments.

8. A method for operating a pneumatic shock source control system according to any one of claims 1 to 7, characterized in that: The main controller detects the acceleration value fed back by the shock sensor during the impact of the shock mechanism. When the acceleration value exceeds the set acceleration threshold, the pneumatic shock exciter is controlled to enter the recovery process until all task processes in the scheduled task of the pneumatic shock exciter have been completed and the standby state is restored.

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