Radio frequency explosion-proof testing equipment and methods

Abstract

This application discloses radio frequency (RF) explosion-proof testing equipment and methods. The equipment includes an explosion-proof testing device and a testing circuit. The sealed explosion chamber of the explosion-proof testing device is configured to be filled with explosive gas. The discharge mechanism includes a discharge electrode and a driving component. The discharge electrode is disposed within the sealed explosion chamber and includes a first electrode and a second electrode. The first electrode is configured to be connected to the RF device under test, and the second electrode is connected to the driving component. The testing circuit includes a processing sub-circuit, configured to send a first control command to the driving component when the first electrode receives a first RF signal output at maximum power from the RF device under test. The driving component is configured to drive the second electrode to move relative to the first electrode in response to the first control command, so that the second electrode periodically switches on and off with the first electrode. This application can perform explosion-proof safety performance testing on practically applied RF devices under test, better meeting actual operational needs.

Description

Technical Field

[0001] This application belongs to the field of radio frequency equipment testing technology, and in particular relates to a radio frequency explosion-proof testing device and method. Background Technology

[0002] Safety performance testing of radio frequency electromagnetic energy equipment in explosive environments is a crucial step in ensuring the safe operation of such equipment. Radio frequency electromagnetic energy equipment transmits signals in explosive environments via cables or other transmission lines.

[0003] In related technologies, theoretical values ​​are usually output by the radio frequency signal source used for testing. When a cable fails in an explosive gas environment, the test is conducted based on these theoretical values ​​to determine whether an explosion occurs. However, using theoretical values ​​for testing may not meet the actual requirements of radio frequency electromagnetic energy equipment. Summary of the Invention

[0004] The embodiments of this application provide a radio frequency explosion-proof testing device and method, which can detect the power safety threshold of radio frequency electromagnetic energy when the inner conductor of the test cable has a contact instability fault in an explosive gas environment, thereby providing data support for the safe operation of coaxial cables in practical applications.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] The first aspect of this application provides a radio frequency explosion-proof testing device, comprising:

[0007] An explosion-proof testing device includes a sealed explosion chamber and a discharge mechanism. The sealed explosion chamber is configured to be filled with explosive gas. The discharge mechanism includes a discharge electrode and a driving component. The discharge electrode is disposed in the sealed explosion chamber and includes a first electrode and a second electrode. The first electrode is configured to be connected to the radio frequency device under test to receive a first radio frequency signal output by the radio frequency device under test at maximum power. The second electrode is connected to the driving component.

[0008] The test circuit includes a processing sub-circuit configured to send a first control command to the driving component when the first electrode receives a first radio frequency signal output by the radio frequency device under test at maximum power.

[0009] The driving component is configured to drive the second electrode to move relative to the first electrode in response to the first control command, so that the second electrode and the first electrode are periodically switched on and off.

[0010] Optionally, the test circuit further includes:

[0011] A calibration subcircuit, electrically connected to the processing subcircuit, is configured to receive a second radio frequency signal transmitted by a test radio frequency source, wherein the power of the second radio frequency signal is n times the power of the first radio frequency signal.

[0012] n is greater than 1, where n is the preset safety factor that the tested radio frequency device needs to meet;

[0013] The processing sub-circuit is further configured to, when the first electrode is in a first state and the explosive gas in the sealed explosion chamber has not exploded, control the first electrode to switch from being connected to the radio frequency device under test to being connected to the calibration sub-circuit, control the calibration sub-circuit to transmit the second radio frequency signal to the first electrode, and send a second control command to the driving component; wherein, the first state is the state in which the second electrode and the first electrode are periodically switched on and off after the first electrode receives the first radio frequency signal output by the radio frequency device under test at maximum power;

[0014] The driving component is further configured to drive the second electrode to move relative to the first electrode in response to the second control command, so that the second electrode and the first electrode are periodically switched on and off.

[0015] Optionally, the test circuit further includes:

[0016] The first gating switch includes a first connection terminal, a second connection terminal, a third connection terminal, and a first control terminal. The first control terminal is electrically connected to the processing sub-circuit, the first connection terminal is electrically connected to the first electrode, the second connection terminal is electrically connected to the radio frequency device under test, and the third connection terminal is electrically connected to the test radio frequency source.

[0017] The first control terminal is electrically connected to the processing sub-circuit and is configured to be connected to the first connection terminal and the third connection terminal, or to be connected to the first connection terminal and the second connection terminal.

[0018] Optionally, the test circuit further includes:

[0019] The power measurement sub-circuit includes: a second gating switch, a third gating switch, a first power meter, and multiple directional couplers;

[0020] The second gating switch includes: a first input terminal, a second control terminal, and a plurality of first output terminals. The first input terminal is connected to the radio frequency device under test or the test radio frequency source. Each first output terminal is connected to a first terminal of one of the directional couplers. The second control terminal is electrically connected to the processing sub-circuit and is configured to be connected to the first input terminal and one of the first output terminals.

[0021] The third gating switch includes: a plurality of second input terminals, a third control terminal, and a second output terminal. Each second input terminal is connected to a second terminal of one of the directional couplers. The second output terminal is connected to the first electrode. The third control terminal is electrically connected to the processing sub-circuit and is configured to be connected to the second output terminal and one of the second input terminals.

[0022] The first power meter is connected to the third end of one of the directional couplers and is configured to measure the first power output from the third end of the directional coupler.

[0023] The operating frequency bands of the different directional couplers are at least partially different. When the directional coupler is connected to the RF device under test or the test RF source through the second gating switch, the operating frequency band of the directional coupler is compatible with the operating frequency band of the RF device under test or the test RF source.

[0024] Optionally, the power measurement subcircuit further includes:

[0025] A second power meter is configured to measure the second power output by the first electrode;

[0026] The processing sub-circuit is further configured to perform feedback adjustment on the output power of the test RF source based on the first power and the second power.

[0027] Optionally, the test circuit further includes:

[0028] The protection sub-circuit includes: a fourth gating switch, a fifth gating switch, a load, and multiple circulators;

[0029] The fourth gating switch includes: a third input terminal, a fourth control terminal, and a plurality of third output terminals. The third input terminal is connected to the second output terminal of the third gating switch, and each of the third output terminals is connected to the first terminal of one of the circulators. The fourth control terminal is electrically connected to the processing sub-circuit and is configured to be connected to the third input terminal and one of the third output terminals.

[0030] The fifth gating switch includes: a plurality of fourth input terminals, a fifth control terminal, and a fourth output terminal. Each of the fourth input terminals is connected to the second terminal of one of the circulators. The fourth output terminal is connected to the first electrode. The fifth control terminal is electrically connected to the processing sub-circuit and is configured to be connected to the fourth output terminal and one of the fourth input terminals.

[0031] The load is connected to the third end of one of the circulators;

[0032] The operating frequency bands of the different circulators are at least partially different. When the circulator is connected to the directional coupler through the third gating switch and the fourth gating switch, the operating frequency band of the circulator is compatible with the operating frequency band of the directional coupler.

[0033] Optionally, the total operating frequency band of the plurality of directional couplers is DC-6GHz, and the total operating frequency band of the plurality of circulators is DC-6GHz;

[0034] Each of the directional couplers has a first operating frequency band, each of the circulators has a second operating frequency band, and the total operating frequency band is the frequency band between the minimum lower limit of the first operating frequency band and the maximum upper limit of the first operating frequency band, or the total operating frequency band is the frequency band between the minimum lower limit of the second operating frequency band and the maximum upper limit of the second operating frequency band.

[0035] Optionally, the first electrode is a metal rod, and the second electrode is a metal disk, the metal disk comprising: a contact portion and a first notch and a second notch disposed opposite to each other;

[0036] The driving component is configured to drive the metal disk to move radially relative to the metal rod, such that when the contact portion contacts the metal rod, the metal disk and the metal rod are connected, and when the first notch or the second notch is opposite to the metal rod, the metal disk and the metal rod are disconnected.

[0037] Optionally, the driving component includes:

[0038] A drive motor having a through hole positioned along the target direction;

[0039] A rotating shaft is connected to the second electrode. The rotating shaft is disposed in the through hole. The length direction of the rotating shaft is parallel to the target direction. The outer wall of the rotating shaft is connected to the drive motor.

[0040] A coaxial rotary joint, wherein the inner wall of the rotary shaft is connected to the coaxial rotary joint.

[0041] Optionally, it also includes:

[0042] A first interface, wherein the first interface is connected to the first electrode via a first radio frequency transmission line, and is configured to be connected to the radio frequency device under test via a second radio frequency transmission line; and / or

[0043] A second interface and an antenna are interconnected, the second interface being connected to the first electrode via the first radio frequency transmission line, and the antenna being configured to wirelessly connect to the radio frequency device under test.

[0044] Optionally, the first RF transmission line and / or the second RF transmission line are coaxial cables, and the size parameters of the second electrode are matched with the impedance of the coaxial cable.

[0045] Optionally, it also includes:

[0046] The air distribution circuit includes: a first intake pipe, a second intake pipe, a mixing chamber, a third intake pipe, and an exhaust pipe;

[0047] The first air intake pipe is configured to transport air, and the second air intake pipe is configured to transport combustible gas. The first air intake pipe and the second air intake pipe are connected to the mixing chamber, and the air and the combustible gas are mixed in the mixing chamber to form the explosive gas.

[0048] The mixing chamber is connected to the third air intake pipe, the third air intake pipe is connected to the sealed explosion chamber, and the exhaust pipe is connected to the sealed explosion chamber.

[0049] Optionally, the gas distribution circuit further includes:

[0050] The first flow meter is installed on the first air inlet pipe;

[0051] The second flow meter is installed on the second air inlet pipe;

[0052] A gas concentration sensor is configured to detect the concentration of explosive gas within the sealed explosion chamber;

[0053] The processing subcircuit is further configured to adjust the first flow meter and / or the second flow meter according to the concentration of the explosive gas, so as to adjust the intake flow rate of the first intake pipe and / or the intake flow rate of the second intake pipe.

[0054] Optionally, it also includes:

[0055] The test cabinet includes a cabinet body, the cabinet body having a receiving cavity, the test circuit being disposed within the receiving cavity, and / or the explosion-proof test equipment includes a gas distribution circuit, the gas distribution circuit being disposed within the receiving cavity.

[0056] Optionally, the cabinet includes an operation panel, the operation panel is equipped with an operation screen, the operation screen is connected to the processing sub-circuit, the operation screen is equipped with buttons, the buttons are used to respond to the user's control operation to trigger the processing sub-circuit to issue control commands.

[0057] Optionally, the test cabinet further includes: an operating table protruding from the cabinet body, the operating table being provided with a mounting groove;

[0058] The explosion-proof testing device also includes:

[0059] The clamping structure includes a support plate and a bracket, wherein the bracket is disposed on the support plate and the support plate is embedded in the mounting groove;

[0060] A transparent cover is placed on the support plate, and the sealed explosion cavity is formed between the transparent cover and the support plate. The sealed explosion cavity is located above the surface of the operating table.

[0061] Optionally, the cabinet is equipped with heat dissipation components, cabinet doors, and casters;

[0062] The heat dissipation assembly includes heat sinks and a cooling fan, the cabinet door includes a first cabinet door and a second cabinet door located on opposite sides of the cabinet body, and the pulleys are located below the cabinet body.

[0063] A second aspect of this application provides a radio frequency explosion-proof testing method, applied to any of the radio frequency explosion-proof testing devices described in the first aspect, the method comprising:

[0064] When the first electrode receives a first radio frequency signal output at maximum power by the radio frequency device under test, a first control command is sent to the driving component, so that the driving component responds to the first control command and drives the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off.

[0065] Optionally, after sending the first control command to the drive component, the method further includes:

[0066] When the first electrode is in the first state and the explosion gas in the sealed explosion chamber does not explode, the first electrode is controlled to switch from being connected to the radio frequency device under test to being connected to the calibration sub-circuit. The calibration sub-circuit is controlled to transmit the second radio frequency signal sent by the test radio frequency source to the first electrode and to send a second control command to the driving component, so that the driving component responds to the second control command and drives the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off.

[0067] Wherein, the power of the second radio frequency signal is n times the power of the first radio frequency signal, n is greater than 1, and n is a preset safety factor that the radio frequency device under test must meet; the first state is the state in which the second electrode and the first electrode periodically switch on and off after the first electrode receives the first radio frequency signal output by the radio frequency device under test at maximum power.

[0068] Optionally, before controlling the calibration sub-circuit to transmit the second radio frequency signal to the first electrode, the method further includes:

[0069] The calibration sub-circuit is controlled to transmit a third radio frequency signal sent by the test radio frequency source to the first electrode, and to send a third control command to the driving component, so that the driving component responds to the third control command to drive the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off; wherein, the power of the third radio frequency signal is greater than the power of the first radio frequency signal;

[0070] When the first electrode is in the second state and the explosion gas in the sealed explosion chamber explodes, the step of controlling the calibration sub-circuit to transmit the second radio frequency signal to the first electrode is executed; wherein, the second state is the state in which the second electrode and the first electrode are periodically switched on and off after the first electrode receives the third radio frequency signal sent by the test radio frequency source.

[0071] Optionally, the method further includes:

[0072] When the first electrode is connected to the calibration sub-circuit, the calibration sub-circuit is controlled to transmit the fourth radio frequency signal sent by the test radio frequency source to the first electrode so that the first electrode has initial discharge power.

[0073] A fourth control command is sent to the drive component, so that the drive component responds to the fourth control command and drives the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off;

[0074] If the explosive gas in the sealed explosion chamber explodes, the discharge power of the first electrode is gradually reduced. After each reduction of the discharge power, the process returns to the step of sending the fourth control command to the drive component until the explosive gas in the sealed explosion chamber does not explode.

[0075] The power safety threshold of the test radio frequency source is determined based on the discharge power of the first electrode when the explosive gas in the sealed explosion chamber does not explode.

[0076] The radio frequency (RF) explosion-proof testing equipment provided according to one or more embodiments of this application includes: an explosion-proof testing device and a testing circuit. The explosion-proof testing device includes a sealed explosion chamber and a discharge mechanism. The sealed explosion chamber is configured to be filled with explosive gas. The discharge mechanism includes: a discharge electrode and a driving component. The discharge electrode is disposed within the sealed explosion chamber and includes a first electrode and a second electrode. The first electrode is configured to be connected to the RF device under test (DUT) to receive a first RF signal output by the DUT at maximum power. The second electrode is connected to the driving component. The testing circuit includes a processing sub-circuit configured to send a first control command to the driving component when the first electrode receives the first RF signal output by the DUT at maximum power. The driving component is configured to drive the second electrode to move relative to the first electrode in response to the first control command, so that the second electrode periodically switches on and off with respect to the first electrode.

[0077] Therefore, in this embodiment, when the tested RF device outputs the first radio frequency at maximum power in a sealed explosion chamber filled with explosive gas, the first electrode and the second electrode are periodically switched on and off. When the first and second electrodes are in contact, the first radio frequency signal forms a path through the contact point. When the first and second electrodes are disconnected, a small spark or arc may be generated at the contact point. This tests the safety of the tested RF device operating at maximum power in an explosive gas environment. If the energy of the first radio frequency signal is sufficient to ignite the explosive gas, the spark or arc generated during the switching process of the two electrodes will trigger an explosion. Based on this, the RF explosion-proof testing equipment of this embodiment can perform explosion-proof safety performance tests on tested RF devices (such as 5G base stations, radar, wireless charging modules, etc.) before or during actual application. The test results are more in line with the actual operating requirements of the tested RF device, avoiding the problem of poor compatibility between theoretical values ​​and the actual needs of the tested RF device in related technologies.

[0078] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0079] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0080] Figure 1 An external structural diagram of the explosion-proof testing equipment according to an embodiment of this application is shown;

[0081] Figure 2 This paper shows an overall architecture diagram of the explosion-proof testing equipment according to an embodiment of the present application;

[0082] Figure 3(a) shows a structural diagram of the explosion-proof testing device according to an embodiment of this application from a first angle;

[0083] Figure 3(b) shows a structural diagram of the explosion-proof testing device according to an embodiment of this application from a second angle;

[0084] Figure 4 This illustration shows a schematic diagram of the connection between the first electrode and the radio frequency device under test according to an embodiment of this application;

[0085] Figure 5 A schematic diagram of the structure of the discharge electrode according to an embodiment of this application is shown;

[0086] Figure 6 A schematic diagram showing the connection relationship between the power measurement sub-circuit and the protection circuit in an embodiment of this application is shown;

[0087] Figure 7 A schematic diagram of a radio frequency signal transmission link according to an embodiment of this application is shown;

[0088] Figure 8 A schematic diagram of the gas distribution circuit according to an embodiment of this application is shown;

[0089] Figure 9 A flowchart of a radio frequency explosion-proof test method according to an embodiment of this application is shown.

[0090] The components are as follows: 01-Test cabinet; 1-Cabinet body; 2-Heat sink; 3-Cooling fan; 4-Air interface; 51-Pulley; 52-Support frame; 6-First cabinet door; 71-First interface; 72-Second interface; 8-Indicator light; 91-Power switch; 92-Emergency stop switch; 10-Industrial control computer; 11-Explosion-proof testing device; 12-Operation panel; 13-Operation table; 11A-Pressure clamping structure; 11A1-Support plate; 11A2-Bracket; 11B-Transparent cover; 11C-Sealed explosion chamber; 11E-Air inlet; 11D-Discharge electrode; 11F-Air outlet; 11G-Drive motor; 11H-Coaxial rotary joint; 11J-Pressure sensor; 11K-Pressure relief port; 11M-Second connector; 11D1-First electrode; 11D2-Second electrode; 11D3-First connector; 11D4-Connecting plate.

[0091] 201 - Processing subcircuit; 301 - Calibration subcircuit; 311 - Power amplifier; 312 - First RF transmission line; 313 - Second RF transmission line; 314 - Antenna; 315 - Signal amplifier; 316 - Adjustable attenuator; 317 - Single-pole double-throw switch; 318 - First gating switch; 401 - Gas distribution circuit; 411 - First normally closed solenoid valve; 412 - Second normally closed solenoid valve; 413 - First flow meter; 414 - Second flow meter; 415 - Mixing chamber; 416 - Third normally closed solenoid valve; 417 - Fourth normally closed solenoid valve; 418 - Gas concentration sensor; 41 9-Back pressure valve; 420-First flame arrester; 421-Second flame arrester; 422-Third flame arrester; 423-Fifth normally closed solenoid valve; 501-Power measurement sub-circuit; 511-Second selector switch; 512-Directional coupler; 513-Third selector switch; 514-Fourth selector switch; 515-First power meter; 516-Second power meter; 517-Sixth selector switch; 601-Protection sub-circuit; 611-Circulator; 612-Fifth selector switch; 613-Load; 614-Seventh selector switch; 701-RF device under test; 702-Test RF source. Detailed Implementation

[0092] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0093] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0094] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0095] Against the backdrop of accelerated intelligent coal mine development, high-frequency radio frequency technologies such as 5G communication, advanced detection radar, and wireless charging are being increasingly applied to underground production systems. These technologies, characterized by high bandwidth, high frequency, low latency, and high-power transmission, can significantly improve communication efficiency, sensing capabilities, and operational automation levels in coal mines, serving as key support for achieving high-quality development of intelligent mines.

[0096] As a new generation of information infrastructure, 5G communication boasts high reliability and low latency, enabling its widespread application in high-definition video surveillance in coal mines, control of unmanned driving equipment, remote dispatching, and efficient aggregation of multi-source sensor data. This overcomes the bottlenecks of complex deployment and poor flexibility inherent in traditional wired communication. Advanced detection radar actively detects coal seams, geological structures, and hidden anomalies using electromagnetic waves, effectively providing early warnings of geological disasters and improving the inherent safety of tunneling and mining operations. Wireless charging technology provides contactless energy replenishment channels for underground robots and sensor nodes, reducing the risk of sparks from cable laying and plugging / unplugging operations, and improving operational reliability and equipment endurance.

[0097] However, underground coal mines contain large amounts of explosive gases such as methane and coal dust, posing extremely high safety risks. According to standards such as "Explosive Atmospheres Part 1: Equipment General Requirements" (GB / T 3836.1-2021), the equivalent isotropic radiated power (EIRP) of radio frequency equipment operating in Class I explosive atmospheres must not exceed 6W to prevent electromagnetic radiation energy from igniting localized sparks or high temperatures, which could lead to explosions. This power threshold severely restricts the normal performance of high-frequency radio frequency equipment underground.

[0098] Specifically, under limited power (6W), the signal coverage of 5G base stations is compressed to within 100 meters, and the transmission distance at the working face is even less than 30 meters, far below the ground transmission capacity of up to kilometers. This necessitates the deployment of a large number of base stations to cover the entire mining area, increasing equipment procurement and installation costs, as well as maintenance difficulties and system redundancy. With reduced transmission power, the detection depth and accuracy of advanced detection radar significantly decrease, making it unable to effectively penetrate complex coal and rock masses and identify subtle geological changes, thus limiting its application in high-speed deep-well tunneling scenarios. Wireless charging systems face problems such as low coupling efficiency and short transmission distance, making it difficult to meet the needs of robots and critical node equipment for rapid and stable energy replenishment.

[0099] Meanwhile, existing radio frequency explosion-proof testing methods suffer from severe frequency band compatibility blind spots. Currently widely adopted explosion-proof standards, such as GB / T 3836 and the IEC 60079 series, primarily target low-frequency electrical equipment (below 1.5 MHz), such as power frequency motors and cable connections. These standard methods rely on power frequency or medium frequency AC sources to generate an ignition test between the test equipment and an explosive gas mixture to assess the equipment's safety under typical operating conditions. However, these traditional low-frequency spark test platforms fail to reproduce the discharge characteristics and ignition risks under real-world operating conditions when facing high-frequency equipment such as 5G communication (3.5 GHz), advanced detection radar (hundreds of MHz), and wireless charging (hundreds of kHz to several MHz) due to severe frequency band mismatch.

[0100] Some studies have explored methods for predicting high-frequency power safety thresholds by constructing numerical models of the interaction between electromagnetic waves and combustible gases, combined with the mechanisms of low-temperature plasma discharge and radio frequency electromagnetic wave energy accumulation. Simulation results show that, under certain operating conditions, the ignition risk of 5G communication and radar-related equipment is far lower than the conservative thresholds set by traditional standards. However, such theoretical analyses largely rely on finite element modeling, which suffers from problems such as sensitive modeling parameters, long simulation calculation cycles, and limited coverage of operating scenarios, making it difficult to replace experimental methods for comprehensive explosion-proof verification of actual equipment.

[0101] It is evident that existing radio frequency electromagnetic energy explosion-proof testing methods have significant limitations when dealing with high-frequency equipment, such as 5G communication devices. Current 5G systems commonly use frequency bands up to 3.5 GHz, while the IEC standard spark test stand, frequently used in explosion-proof testing, is designed only for low-frequency circuits with frequencies not exceeding 1.5 MHz. When the frequency increases to the GHz level, a severe impedance mismatch occurs between the test circuit and the spark test stand, resulting in significant energy reflection. This leads to a significant reduction in the actual excitation energy obtained by the spark gap, making it impossible to effectively simulate the discharge characteristics and ignition capabilities of real high-frequency equipment. This is one of the main reasons why traditional IEC spark test stands are unsuitable for explosion-proof assessment of high-frequency radio frequency equipment.

[0102] Furthermore, although related technologies have explored aspects such as antenna topology, transmission line structure, and multi-band design, they generally share the following common problems:

[0103] Existing devices are mostly electromagnetic energy safety threshold testing platforms used to verify the accuracy of theoretical safety thresholds. The signal waveform is provided by a signal source, lacking the capability to perform dedicated explosion-proof safety testing for specific types of radio frequency (RF) equipment (such as 5G base stations, radar, and wireless charging modules). In this case, both the signal waveform and RF energy are provided by the RF device under test, making it difficult to meet the practical verification requirements at the device level. These platforms cannot simulate the energy characteristics and signal modulation behavior of actual RF equipment under real-world operating conditions, lacking the capability to perform "physical-level" explosion-proof safety testing on specific devices such as 5G base stations, advanced detection radars, and wireless charging devices. In practical applications, the RF waveform and output energy are generated by the device under test itself, possessing complex modulation characteristics, spectral broadening, and nonlinear load effects. Existing platforms cannot effectively connect to or adapt to such devices, making it difficult to meet the intrinsic safety verification and access testing requirements at the device level, thus limiting their practicality and engineering promotion value.

[0104] In summary, current radio frequency explosion-proof testing methods cannot meet the compliance testing requirements for 5G communication, advanced detection radar, and wireless charging equipment before their application in underground mines, becoming a key bottleneck in the intelligent and safe transformation of coal mines.

[0105] Based on the above, this application provides a radio frequency explosion-proof testing device that can perform explosion-proof safety performance testing on radio frequency devices under test (such as 5G base stations, radar, wireless charging modules, etc.) before or during actual application. The test results are more in line with the actual operating requirements of the radio frequency devices under test, thereby helping the coal mining industry to transform towards intelligence and safety.

[0106] The radio frequency explosion-proof testing equipment of this application embodiment will be described below with reference to the specific accompanying drawings.

[0107] Figure 1 An external structural diagram of the explosion-proof testing equipment according to an embodiment of this application is shown; Figure 2 Figure 3 shows an overall architectural diagram of the explosion-proof testing device according to an embodiment of this application; Figure 3(a) shows a structural diagram of the explosion-proof testing device from a first angle according to an embodiment of this application; Figure 3(b) shows a structural diagram of the explosion-proof testing device from a second angle according to an embodiment of this application. It should be noted that... Figure 2 The tested RF device, test RF source, ventilation environment, air, and combustible gas are not components of the explosion-proof test equipment's system architecture. Figure 2 The purpose of this is merely to illustrate the connection between the explosion-proof testing equipment and the external environment.

[0108] A first aspect of this application provides a radio frequency (RF) explosion-proof testing device, including an explosion-proof testing apparatus 11 and a testing circuit. The explosion-proof testing apparatus 11 includes a sealed explosion chamber 11C and a discharge mechanism. The sealed explosion chamber 11C is configured to be filled with explosive gas. The discharge mechanism includes a discharge electrode 11D and a driving assembly. The discharge electrode 11D is disposed within the sealed explosion chamber 11C and includes a first electrode 11D1 and a second electrode 11D2. The first electrode 11D1 is configured to be connected to a radio frequency device under test (RFD) 701 to receive a first RF signal output by the RFD 701 at maximum power. The second electrode 11D2 is connected to the driving assembly. The testing circuit includes a processing sub-circuit 201, configured to send a first control command to the driving assembly when the first electrode 11D1 receives the first RF signal output by the RFD 701 at maximum power. The driving component is configured to drive the second electrode 11D2 to move relative to the first electrode 11D1 in response to the first control command, so that the second electrode 11D2 and the first electrode 11D1 are periodically switched on and off.

[0109] Therefore, in this embodiment of the application, when the tested radio frequency device 701 outputs the first radio frequency at maximum power, in an environment where the sealed explosion cavity 11C is filled with explosive gas, the first electrode 11D1 and the second electrode 11D2 are periodically switched on and off. When the first electrode 11D1 and the second electrode 11D2 are in contact, the first radio frequency signal forms a path through the contact point. When the first electrode 11D1 and the second electrode 11D2 are disconnected, the contact point may generate a small spark or arc, thereby testing the safety of the tested radio frequency device 701 operating at maximum power in an explosive gas environment. If the energy of the first radio frequency signal is sufficient to ignite the explosive gas, the spark or arc generated during the switching process of the two electrodes will trigger the explosive gas to explode. Based on this, the radio frequency explosion-proof testing equipment of this application embodiment can perform explosion-proof safety performance testing on the radio frequency device 701 under test (such as 5G base station, radar, wireless charging module, etc.) before or during actual application. The test results are more in line with the actual operation requirements of the radio frequency device 701 under test, avoiding the problem of poor compatibility with the actual requirements of the radio frequency device 701 under test when using theoretical values ​​for testing in related technologies.

[0110] like Figure 1 As shown, the radio frequency explosion-proof test equipment of this application embodiment may include: a test cabinet 01, including a cabinet body 1. The cabinet body 1 can serve as a carrier for the explosion-proof test device 11 and the test circuit, which will be described in detail below.

[0111] It should be noted that, in order to simulate the downhole environment, this embodiment of the application includes a sealed explosion chamber 11C, which is filled with an explosive gas. This explosive gas is a gas that may explode upon receiving a certain amount of energy (such as thermal energy), and is a mixture of combustible gas and air. The combustible gas can be methane (CH4), hydrogen (H2), carbon monoxide (CO), hydrogen sulfide (H2S), etc. For example, the mixed gas can be: methane / air (Class I), propane / air (IIA), ethylene / air (IIB), and hydrogen / air (IIC).

[0112] It is understood that the radio frequency device under test 701 can be a 5G communication device (such as a 5G base station), an advanced detection radar and a wireless charging module, or a portable terminal device such as a mobile phone or tablet computer.

[0113] Before the tested radio frequency device 701 is put into actual working scenarios, this application embodiment tests whether the tested radio frequency device 701 can operate safely in explosive gas environments such as coal mines based on radio frequency explosion-proof testing equipment, thereby ensuring that the tested radio frequency device 701 will not cause safety accidents after being put into actual working scenarios.

[0114] Figure 4 A schematic diagram showing the connection between the first electrode 11D1 and the radio frequency device under test 701 according to an embodiment of this application is shown.

[0115] In some embodiments, the radio frequency explosion-proof testing equipment further includes: a first interface 71, and / or, the first interface 71 and an antenna 314 interconnected. The first interface 71 is connected to the first electrode 11D1 via a first radio frequency transmission line 312, and is configured to be connected to the radio frequency device under test 701 via a second radio frequency transmission line 313; and / or, the second interface 72 is connected to the first electrode 11D1 via the first radio frequency transmission line 312, and the antenna 314 is configured to be wirelessly connected to the radio frequency device under test 701.

[0116] For example, the first interface 71 and the second interface 72 can be set on the cabinet 1 of the test cabinet 01. The first interface 71 is a direct connection port, and the second interface 72 is an OTA (Over-The-Air Testing) interface.

[0117] The first radio frequency transmission line 312 and the second radio frequency transmission line 313 can be coaxial cables. The first interface 71 can be connected to the first electrode 11D1 via a coaxial cable and wired to the radio frequency device under test 701 via a coaxial cable. The second interface 72 can be connected to the first electrode 11D1 via a coaxial cable and connected to the antenna 314.

[0118] In some embodiments, the first interface 71 and the second interface 72 can be connected to the first electrode 11D1 via the same coaxial cable, but not simultaneously, for example, through a selector switch. In other embodiments, the first interface 71 and the second interface 72 can also be connected to the first electrode 11D1 via different coaxial cables.

[0119] For example, a first connector 11D3 is provided on one side of the first electrode 11D1. The first connector 11D3 is used to connect to a coaxial cable, thereby connecting to the first interface 71 or the second interface 72. A second connector 11M may be provided on one side of the second electrode 11D2. The second connector 11M is used to connect to a coaxial cable, which can be connected to a load 613, thereby consuming radio frequency energy.

[0120] For example, the discharge electrode 11D also includes a connecting plate 11D4, on which the first electrode 11D1 and the first connector 11D3 are disposed, thereby achieving connection. The connecting plate 11D4 also serves as a support.

[0121] In this embodiment, the process of connecting the first electrode 11D1 to the radio frequency device under test 701 through the first interface 71, and then testing the radio frequency device under test 701, is defined as a direct connection test. It is understood that direct connection testing is suitable for devices whose radio frequency output ports can directly output signals via coaxial cables, such as 5G base stations and other communication devices. The radio frequency energy of such devices is directly connected to the internal test circuit of the radio frequency explosion-proof test equipment through the SMA (coaxial cable) interface and radio frequency transmission line for explosion-proof performance evaluation.

[0122] In some embodiments, a signal amplifier 315, an adjustable attenuator 316, and a power amplifier 311 are sequentially connected between the second interface 72 and the first transmission line, wherein the signal amplifier 315 is connected to the antenna 314, and the power amplifier 311 is connected to the first transmission line.

[0123] In this embodiment, the process of connecting the first electrode 11D1 to the radio frequency device under test (RFD) 701 via the second electrode 11D2 to test the RFD 701 is defined as OTA testing. It is understood that OTA testing is suitable for devices that cannot extract RF energy via wired connections, such as mobile phones and portable terminals. In this mode, the RFD transmits an RF signal through antenna 314. After transmission via a wireless link, the signal is acquired by receiving antenna 314 and sent to signal amplifier 315 and adjustable attenuator 316. The signal gain is adjusted according to specific test requirements, and then amplified by power amplifier 311 before being injected into the ignition circuit, achieving power excitation equivalent to that of the actual device. In this process, "RFD 701—antenna 314—signal amplifier 315—adjustable attenuator 316" together constitute an equivalent RF signal source, used in conjunction with power amplifier 311 to replace the direct input signal of the actual device. To improve system integration, the power amplifier 311 used in OTA testing can be shared with the calibration sub-circuit 301 described below (e.g., shared with the test RF source 702). For example, the connection relationship of the power amplifier 311 can be switched through a single-pole double-throw switch 317, thereby improving the system's testing flexibility and hardware utilization.

[0124] For example, in a direct connection test or OTA test, an explosive gas environment (such as a methane / air mixture) of the required concentration is configured, the RF device under test 701 is started and its maximum operating power P is output, the drive motor 11G speed is set to 400 r / min, the servo motor is started, and the test device operates continuously for 6 minutes. If no explosion occurs during this period, it is preliminarily determined that the RF device under test 701 is intrinsically safe under the current conditions.

[0125] In some embodiments, the first RF transmission line 312 and / or the second RF transmission line 313 are coaxial cables, and the dimensional parameters of the second electrode 11D2 are matched with the impedance of the coaxial cable.

[0126] Understandably, to ensure effective transmission of radio frequency energy and stable ignition, this embodiment of the application optimizes the impedance matching design of the second electrode 11D2 based on its frequency characteristics. To ensure that the impedance of the coaxial cable always meets preset requirements, such as always being 50 ohms, this embodiment sets the dimensional parameters of the second electrode 11D2 so that they match the impedance of the coaxial cable. That is, even after adding the first electrode 11D1 and the second electrode 11D2 to the coaxial cable, the impedance of the coaxial cable still meets the preset requirements. This, to a certain extent, improves the discharge efficiency and consistency of the discharge electrode 11D under high-frequency conditions.

[0127] Figure 5A schematic diagram of the structure of the discharge electrode 11D according to an embodiment of this application is shown.

[0128] like Figure 5 As shown, in some embodiments, the first electrode 11D1 is a metal rod, and the second electrode 11D2 is a metal disk. The metal disk includes a contact portion and a first notch and a second notch disposed opposite to each other. The driving component is configured to drive the metal disk to move radially relative to the metal rod, so that when the contact portion contacts the metal rod, the metal disk is connected to the metal rod, and when the first notch or the second notch is disposed opposite to the metal rod, the metal disk is disconnected from the metal rod.

[0129] Understandably, during operation, the metal rod remains stationary while the driving component drives a metal disk to rotate around the metal rod. The metal disk has a first notch and a second notch. During rotation, a periodic "on-off-on-off" state is formed between the metal disk and the metal rod, creating a discharge gap at a specific moment within each cycle. If the RF power of the tested RF device 701 is sufficiently high, a discharge spark can be generated within the gap, thereby igniting the explosive gas within the sealed explosion chamber 11C.

[0130] For example, the metal disk can be a cadmium disk, and the metal rod can be a tungsten wire rod.

[0131] In some embodiments, the drive assembly includes: a drive motor 11G, a rotating shaft, and a coaxial rotating joint 11H.

[0132] The drive motor 11G has a through hole arranged along the target direction; the rotating shaft is connected to the second electrode 11D2, the rotating shaft is arranged in the through hole, the length direction of the rotating shaft is parallel to the target direction, the outer wall of the rotating shaft is connected to the drive motor 11G; the inner wall of the rotating shaft is connected to the coaxial rotating joint 11H.

[0133] For example, the drive motor 11G is a servo motor, such as a servo hollow motor. The outer wall of the rotating shaft is connected to the servo hollow motor, and the inner wall of the rotating shaft is engaged with the coaxial rotating joint 11H. The cadmium disk is mounted on the rotating shaft and is driven to rotate by the servo hollow motor.

[0134] In some embodiments, the test cabinet 01 further includes an operating table 13 protruding from the cabinet body 1, the operating table 13 being provided with a mounting groove; the explosion-proof test device 11 further includes a clamping structure 11A and a transparent cover 11B. The clamping structure 11A includes a support plate 11A1 and a bracket 11A2, the bracket 11A2 being disposed on the support plate 11A1, the support plate 11A1 being embedded in the mounting groove; the transparent cover 11B is disposed on the support plate 11A1, the transparent cover 11B and the support plate 11A1 forming the sealed explosion cavity 11C, the sealed explosion cavity 11C being located above the surface of the operating table 13.

[0135] Understandably, the clamping structure 11A is used to reliably press the transparent cover 11B onto the support plate 11A1, so that a sealed explosion chamber 11C is formed between the transparent cover 11B and the support plate 11A1. The sealed explosion chamber 11C is located above the surface of the operating table 13, thus facilitating observation of whether a gas explosion has occurred within the sealed explosion chamber 11C. The transparent cover 11B can be made of a high-strength inorganic transparent material such as acrylic, thus facilitating observation of whether an explosion has occurred. The bracket 11A2 not only provides support but also provides a pressing point, thereby allowing the entire sealed explosion chamber 11C structure to be installed in the mounting groove of the operating table 13 by pressing the bracket 11A2.

[0136] In some embodiments, the cabinet 1 is provided with a heat dissipation component, a cabinet door, and a pulley 51; the heat dissipation component includes a heat sink 2 and a cooling fan 3, the cabinet door includes a first cabinet door 6 and a second cabinet door located on opposite sides of the cabinet 1, and the pulley 51 is located below the cabinet 1.

[0137] The heat sink 2 and cooling fan 3 are used to dissipate heat from the heat-generating components (such as circuits and wires) inside the cabinet 1, ensuring the thermal stability of the equipment under long-term high-power operation. The first cabinet door 6 and the second cabinet door facilitate the protection and maintenance of the components inside the cabinet 1, and facilitate inspection and wiring. Multiple casters 51 can be included to facilitate the movement of the test cabinet 01, providing flexibility in the application scenarios of the test cabinet 01.

[0138] In some embodiments, multiple sets of support members are also provided below the test cabinet 01 to provide support for the cabinet 1 and improve the stability of the equipment.

[0139] In some embodiments, the cabinet 1 has a receiving cavity, and the test circuit is disposed in the receiving cavity.

[0140] See also Figure 2 In some embodiments, the test circuit further includes:

[0141] The calibration sub-circuit 301, electrically connected to the processing sub-circuit 201, is configured to receive a second radio frequency signal transmitted by the test radio frequency source 702, wherein the power of the second radio frequency signal is n times the power of the first radio frequency signal.

[0142] n is greater than 1, where n is a preset safety factor that the tested RF device 701 must meet; the processing sub-circuit 201 is further configured to, when the first electrode 11D1 is in a first state and the explosive gas in the sealed explosion chamber 11C has not exploded, control the first electrode 11D1 to switch from being connected to the tested RF device 701 to being connected to the calibration sub-circuit 301, control the calibration sub-circuit 301 to transmit the second RF signal to the first electrode 11D1, and send a second control command to the driving component; wherein, the first state is the state in which the second electrode 11D2 and the first electrode 11D1 are periodically switched on and off after the first electrode 11D1 receives the first RF signal output by the tested RF device 701 at maximum power; the driving component is further configured to, in response to the second control command, drive the second electrode 11D2 to move relative to the first electrode 11D1, so that the second electrode 11D2 and the first electrode 11D1 are periodically switched on and off.

[0143] Understandably, if the explosive gas does not explode during direct connection testing or OTA testing, it indicates that the RF device under test 701 is preliminarily determined to be inherently safe under the current conditions. However, for the RF device under test 701, it is generally required that it meet a certain safety margin beyond its maximum power, thereby further improving the safety of the RF device under test 701. Therefore, in order to determine whether the RF device under test 701 further meets this safety margin, this application embodiment sets up a calibration sub-circuit 301 to calibrate the safety margin.

[0144] For example, during the calibration process, the discharge power of the first electrode 11D1 can be set to nP (where n is a set safety factor, such as 1.25, 1.5, 2, etc., and P is the maximum power of the RF device under test 701), and the motor can be started for testing. If the test device does not explode within 6 minutes, it can be further determined that the RF device under test 701 still has intrinsic safety under higher energy excitation conditions.

[0145] Therefore, the embodiments of this application adopt a dual-mode architecture of "the radio frequency device under test 701 + calibration sub-circuit 301" to realize the real evaluation of the explosion-proof performance of physical devices such as 5G base stations, radar, and wireless charging under working conditions. It covers the actual impact of modulation mode, spectrum characteristics and output waveform on ignition risk, solves the problem that existing test platforms cannot perform intrinsic safety verification at the device level, and improves the engineering guidance value of test results.

[0146] In some embodiments, the test circuit further includes: a first gating switch 318, including a first connection terminal, a second connection terminal, a third connection terminal, and a first control terminal, wherein the first control terminal is electrically connected to the processing sub-circuit 201, the first connection terminal is electrically connected to the first electrode 11D1, the second connection terminal is electrically connected to the radio frequency device under test 701, and the third connection terminal is electrically connected to the test radio frequency source 702; the first control terminal is electrically connected to the processing sub-circuit 201 and is configured to be connected to the first connection terminal and the third connection terminal, or to be connected to the first connection terminal and the second connection terminal.

[0147] Therefore, by switching the connection state between the first electrode 11D1 and the RF device under test 701 and the test RF source 702, for example in direct connection test or OTA test, the first electrode 11D1 can be connected to the RF device under test 701, and the first electrode 11D1 can be connected to the test RF source 702 in the calibration process, so that at least the explosion-proof test device 11 can be reused, thereby improving resource utilization.

[0148] Figure 6 A schematic diagram showing the connection relationship between the power measurement sub-circuit 501 and the protection circuit in an embodiment of this application is shown.

[0149] It is understood that during the transmission of the radio frequency signal output by the radio frequency device under test 701 or the test radio frequency source 702 to the first electrode 11D1, there will be a certain amount of radio frequency energy loss. Therefore, in order to improve the accuracy of the test results, this application embodiment sets up a power measurement sub-circuit 501 to perform power measurement. The power measurement circuit is described below.

[0150] Combination Figure 2 and Figure 6 In some embodiments, the test circuit further includes:

[0151] The power measurement sub-circuit 501 includes: a second gating switch 511, a third gating switch 513, a first power meter 515, and multiple directional couplers 512;

[0152] The second gating switch 511 includes: a first input terminal, a second control terminal, and a plurality of first output terminals. The first input terminal is connected to the radio frequency device under test 701 or the test radio frequency source 702. Each first output terminal is connected to a first terminal of a directional coupler 512. The second control terminal is electrically connected to the processing sub-circuit 201 and is configured to be connected to the first input terminal and one of the first output terminals.

[0153] The third gating switch 513 includes: a plurality of second input terminals, a third control terminal and a second output terminal. Each second input terminal is connected to a second terminal of one of the directional couplers 512. The second output terminal is connected to the first electrode 11D1. The third control terminal is electrically connected to the processing sub-circuit 201 and is configured to be connected to the second output terminal and one of the second input terminals.

[0154] The first power meter 515 is connected to the third end of one of the directional couplers 512 and is configured to measure the first power output from the third end of the directional coupler 512;

[0155] The operating frequency bands of the different directional couplers 512 are at least partially different. When the directional coupler 512 is connected to the radio frequency device under test 701 or the test radio frequency source 702 through the second gating switch 511, the operating frequency band of the directional coupler 512 is compatible with the operating frequency band of the radio frequency device under test 701 or the test radio frequency source 702.

[0156] Understandably, the directional coupler 512 is used to couple a portion of the RF signal from the RF device under test 701 or the test RF source 702 for power measurement without affecting the transmission of the RF signal.

[0157] Since different RF devices under test 701 may operate in different frequency bands, or different test RF sources 702 may operate in different frequency bands, in order to meet the explosion-proof testing requirements of RF devices under test 701 or different test RF sources 702 in different frequency bands, this application embodiment expands the applicable frequency band range of the RF explosion-proof test equipment by setting multiple directional couplers 512 to achieve wideband testing.

[0158] like Figure 6 As shown, to ensure accurate measurements at different frequency bands, a second gating switch 511 is used for signal path selection. Although the coaxial cable and the gating switch themselves have a wide operating frequency range, the directional coupler 512 is typically a narrowband device, requiring the selection of matching devices under different frequency conditions. Therefore, by switching the directional coupler 512 corresponding to the RF device under test 701 or the test RF source 702 at different frequency bands using the second gating switch 511, a wider frequency range of testing capability can be achieved. For example, the second gating switch 511 can be a single-pole N-throw switch, and the third gating switch 513 can be an N-pole single-throw switch, where the value of N can be the same as the number of directional couplers 512.

[0159] In some embodiments, the power measurement subcircuit 501 further includes a sixth gating switch 517, which includes a plurality of first terminals, control terminals and second terminals. Each first terminal is connected to a third terminal of one of the directional couplers 512. The second terminal of the sixth gating switch 517 is connected to a first power meter 515. The control terminal of the sixth gating switch 517 is used to receive control commands from the processing subcircuit 201.

[0160] See also Figure 6 To improve system integration and reduce hardware redundancy, a fifth selector switch 612 is set in the module to switch between multiple measurement paths, so that the same power meter can share power measurement for different circuits, thereby improving the utilization rate of the first power meter 515.

[0161] Figure 7 A schematic diagram of a radio frequency signal transmission link according to an embodiment of this application is shown.

[0162] In some embodiments, the power measurement subcircuit 501 further includes: a second power meter 516 configured to measure the second power output by the first electrode 11D1; the processing subcircuit 201 is further configured to perform feedback adjustment on the output power of the test RF source 702 based on the first power and the second power.

[0163] like Figure 7 As shown, the first power meter 515 is used to read the output power value at the coupling end of the directional coupler 512. By measuring the loss between the RF transmission links, the actual RF power of the discharge electrode 11D can be calculated and controlled. This application embodiment mainly involves three main RF transmission links, defined as follows:

[0164] (1) Link 1: The transmission path from the signal source to the first power meter 515;

[0165] (2) Link 2: The path from the first power meter 515 to the first electrode 11D1;

[0166] (3) Link 3: The complete transmission link of the signal source discharge mechanism (the final energy transmission path).

[0167] The signal source can be either the RF device under test 701 or the test RF source 702. Taking the test RF source 702 as an example, during calibration, the transmission attenuation value of the measurement link 3 is usually measured, and either link 1 or link 2 can be selected for supplementary measurement. According to the measurement principle, the sum of the reading of the first power meter 515 and the loss of link 1 is the actual output power of the signal source; and by subtracting the loss value of link 3 from the output power of the signal source, the effective discharge power actually acting on the discharge mechanism can be calculated.

[0168] To ensure the stability and accuracy of test data, a discharge power feedback mechanism is introduced into the calibration sub-circuit 301. By setting the target discharge power of the first electrode 11D1 and measuring the feedback value in real time, closed-loop control of the signal source is achieved, and the output amplitude is automatically adjusted to ensure that the radio frequency energy at the discharge electrode 11D remains stable, effectively improving the consistency and reliability of the threshold test results.

[0169] In some embodiments, the test circuit further includes a protection sub-circuit 601, comprising a fourth gating switch 514, a fifth gating switch 612, a load 613, and a plurality of circulators 611; the fourth gating switch 514 includes a third input terminal, a fourth control terminal, and a plurality of third output terminals, the third input terminal being connected to the second output terminal of the third gating switch 513, each of the third output terminals being connected to the first terminal of one of the circulators 611, and the fourth control terminal being electrically connected to the processing sub-circuit 201 and configured to be connected to the third input terminal and one of the third output terminals; the fifth gating switch 612 includes a plurality of fourth input terminals, a fifth control terminal, and a fourth output terminal. Each of the fourth input terminals is connected to the second terminal of one of the circulators 611, the fourth output terminal is connected to the first electrode 11D1, and the fifth control terminal is electrically connected to the processing sub-circuit 201 and configured to be connected to the fourth output terminal and one of the fourth input terminals; the load 613 is connected to the third terminal of one of the circulators 611; wherein the operating frequency bands of the different circulators 611 are at least partially different, and when the circulator 611 is connected to the directional coupler 512 through the third gating switch 513 and the fourth gating switch 514, the operating frequency band of the circulator 611 is compatible with the operating frequency band of the directional coupler 512.

[0170] Understandably, because the circuit of the discharge mechanism exhibits a periodic "on-off-on" change during operation, a strong total internal reflection of energy (circulator 611, directional coupler 512, power amplifier) ​​will occur once a circuit is broken. Without an effective protection mechanism, this can easily lead to power amplifier overload or damage. Based on this, the embodiments of this application protect the equipment by setting up circulator 611 and load 613 to absorb and dissipate the reflected energy.

[0171] While the coaxial cable and the selector switch themselves have a wide operating frequency range, the circulator 611 is typically a narrowband device, requiring the selection of matching devices for different frequency conditions. Therefore, by switching between the directional coupler 512 and the circulator 611 at different frequency bands using the fourth selector switch 514 and the fifth selector switch 612, a wider frequency range of testing capability can be achieved. The fourth selector switch 514 can be a single-pole N-throw switch, and the fifth selector switch 612 can be an N-pole single-throw switch, where the value of N can be the same as the number of circulators 611.

[0172] Similarly, in order to achieve resource reuse, load 613 can be connected to each circulator 611 through the seventh selector switch 614.

[0173] In some embodiments, there are three directional couplers 512 and five circulators 611. Of course, to further expand the test frequency range, the frequency band coverage capability can be flexibly expanded by replacing the gating switch or increasing the number of directional couplers 512 and circulators.

[0174] Therefore, the embodiments of this application integrate power measurement and reflected energy absorption mechanisms, compensate for power amplifier gain drift through closed-loop control, stabilize output excitation power, improve control accuracy, and enhance the controllability of RF excitation energy and the accuracy and repeatability of safety threshold tests.

[0175] In some embodiments, the total operating frequency band of the plurality of directional couplers 512 is DC-6GHz, and the total operating frequency band of the plurality of circulators 611 is DC-6GHz; wherein each of the directional couplers 512 has a first operating frequency band, each of the circulators 611 has a second operating frequency band, and the total operating frequency band is the frequency band between the minimum lower limit of the first operating frequency band and the maximum upper limit of the first operating frequency band, or the total operating frequency band is the frequency band between the minimum lower limit of the second operating frequency band and the maximum upper limit of the second operating frequency band.

[0176] It should be noted that DC refers to direct current, and the frequency of direct current can be 0. Therefore, the total operating frequency band of the plurality of directional couplers 512 can be 0-6GHz.

[0177] Therefore, this embodiment of the application, through the arrangement of multiple directional couplers 512, multiple circulators 611, and multiple circulators 611, breaks through the limitation of existing IEC intrinsically safe spark testers that are only applicable to frequencies below 1.5MHz, and realizes rapid switching between different frequency bands and continuous frequency point testing, such as high-power (e.g., above 200W) RF ignition tests in the ultra-wide frequency range from DC to 6GHz. Combined with the impedance matching design of the wideband discharge mechanism, it improves the high-frequency energy coupling efficiency, has the ability to further expand the power and frequency range, and improves the frequency band adaptability and engineering compatibility of explosion-proof test RF.

[0178] In related technologies, most testing devices use manual gas mixing to configure explosive environments, which cannot accurately control the concentration and distribution of methane or coal dust. This results in poor test reproducibility and insufficient reliability of test data, affecting the scientific validity and accuracy of safety threshold assessment.

[0179] Figure 8 A schematic diagram of the gas distribution circuit 401 according to an embodiment of this application is shown.

[0180] In some embodiments, the system further includes a gas distribution circuit 401, comprising a first intake pipe, a second intake pipe, a mixing chamber 415, a third intake pipe, and an exhaust pipe; the first intake pipe is configured to deliver air, the second intake pipe is configured to deliver combustible gas, the first intake pipe and the second intake pipe are connected to the mixing chamber 415, and the air and the combustible gas are mixed in the mixing chamber 415 to form the explosive gas; the mixing chamber 415 is connected to the third intake pipe, the third intake pipe is connected to the sealed explosive chamber 11C, and the exhaust pipe is connected to the sealed explosive chamber 11C.

[0181] In some embodiments, the gas distribution circuit 401 further includes: a first flow meter 413 disposed on the first air intake pipe; a second flow meter 414 disposed on the second air intake pipe; a gas concentration sensor 418 configured to detect the concentration of explosive gas in the sealed explosion chamber 11C; the processing sub-circuit 201 is further configured to adjust the first flow meter 413 and / or the second flow meter 414 according to the concentration of explosive gas, so as to adjust the air intake flow rate of the first air intake pipe and / or the air intake flow rate of the second air intake pipe.

[0182] In some embodiments, a first normally closed solenoid valve 411 is provided on the first intake pipe and before the first flow meter 413, and a second normally closed solenoid valve 412 is provided on the second intake pipe and before the first flow meter 413; a back pressure valve 419, a third normally closed solenoid valve 416 and a first flame arrester 420 are also provided in sequence between the mixing chamber 415 and the sealed explosion chamber 11C.

[0183] The working principle of the valve distribution circuit 401 is explained below:

[0184] First, air and combustible gas enter their respective normally closed solenoid valves. Considering that the gas supply source (such as a gas storage tank) usually has a high pressure, it is recommended to install a pressure reducing valve upstream of the solenoid valve to reduce the input pressure, ensure safe system operation, and improve flow control accuracy. After pressure reduction, the gas enters two flow meters, and by adjusting the flow ratio, the gas is mixed to the set concentration. Subsequently, the gas enters the mixing chamber 415 for thorough mixing, and the pressure is set by the back pressure valve 419 to ensure that the mixed gas reaches the target pressure and has stable transmission capability. The mixed gas then enters the explosion chamber through the third normally closed solenoid valve 416 and the first flame arrester 420.

[0185] In some embodiments, the explosion chamber is provided with two gas outlet channels: the first channel is a gas replacement channel, which is connected to the external ventilation environment by the second flame arrester 421, the fourth normally closed solenoid valve 417, and the gas concentration sensor 418, to ensure that the original gas in the explosion chamber can be effectively replaced to form the required explosive gas environment; the second channel is a pressure relief channel, which is composed of the third flame arrester 422 and the fifth normally closed solenoid valve 423, and is used to quickly relieve pressure after the explosion to protect the equipment from impact damage.

[0186] Understandably, the solenoid valve control strategies of the gas distribution circuit 401 at different operating stages are as follows:

[0187] (1) Gas mixing stage: Open the first normally closed solenoid valve 411 to the fourth normally closed solenoid valve 417 to start the gas mixing and replacement function.

[0188] (2) Testing phase: Close all solenoid valves and keep the explosion chamber gas-tight.

[0189] (3) After the explosion: When the pressure sensor 11J detects that the pressure inside the cavity exceeds 0.1 MPa, the fifth normally closed solenoid valve 423 is automatically opened to quickly release the pressure and prevent the explosion impact from damaging the device.

[0190] During the gas mixing process, the system uses a gas concentration sensor 418 to detect the concentration of the mixed gas in real time, and automatically adjusts the flow meter based on the detection results to achieve closed-loop control and ensure the accuracy and stability of the concentration ratio.

[0191] The flow meter's parameter control methods are as follows:

[0192]

[0193] It is the target gas mixture concentration. It is the flow rate of explosive gas. It's airflow. It is the concentration correction factor.

[0194] The gas distribution circuit 401 in this embodiment has a clear structure, fast response, and precise control, making it suitable for configuration in various explosive gas environments and meeting the requirements of high-reliability explosion-proof testing. A concentration closed-loop regulation mechanism based on a flow meter and sensor enables precise control and real-time monitoring of the explosive environment, ensuring the stability and safety of the test atmosphere.

[0195] In some embodiments, the sealed explosion chamber 11C of the explosion-proof testing device 11 further includes an air inlet 11E and an air outlet 11F, wherein the air inlet 11E is connected to the third air inlet pipe and the air outlet 11F is connected to the exhaust pipe.

[0196] In some embodiments, the gas distribution circuit 401 is disposed in the accommodating cavity, and the cabinet 1 is also provided with a gas passage interface 4, which can be connected to the first air intake pipe and the second air intake pipe respectively.

[0197] In some embodiments, the explosion-proof testing device 11 is further provided with a pressure sensor 11J and a pressure relief port, configured to detect the pressure inside the sealed explosion chamber 11C, and the pressure relief port 11K is used to relieve pressure in the sealed explosion chamber 11C.

[0198] In some embodiments, the cabinet 1 includes an operation panel 12, the operation panel 12 is provided with an operation screen, the operation screen is connected to the processing sub-circuit 201, the operation screen is provided with buttons, the buttons are used to respond to the user's control operation to trigger the processing sub-circuit 201 to issue control commands.

[0199] For example, the operation screen can be a touch screen connected to the processing sub-circuit 201, and the buttons can be physical buttons or virtual buttons. There can be multiple buttons, each of which is used to respond to different control operations by the user.

[0200] In some embodiments, the processing sub-circuit 201 and the operation screen can form an industrial control computer 10, responsible for running the user interface control software. The processing sub-circuit 201 may include a processing chip, such as an MCU (Microcontroller Unit), DSP (Digital Signal Processor), or CPU (Central Processing Unit). This processing chip has processing capabilities and can be used to coordinate and link various sub-circuits and mechanisms. Display and control can be achieved through the industrial control computer 10 and an IO (Input / Output) card to realize centralized monitoring and coordinated control of the test equipment. Its control functions include the start-up, shutdown, and status management of subsystems such as the radio frequency system, gas path system, motor speed, electrical interlock, and valve opening pressure; its monitoring functions cover the real-time acquisition and display of key parameters such as radio frequency power, gas concentration, and gas pressure, ensuring the controllability, safety, and data integrity of the experimental process.

[0201] In some embodiments, the cabinet 1 is also provided with a plurality of indicator lights 8, each indicator light 8 being used to display the operating status of the equipment, and the indication content may include key information such as the RF system switch status, motor operating status, gas distribution mode, and explosion trigger status.

[0202] In some embodiments, the cabinet 1 is also equipped with a main power switch 91 and an emergency stop switch 92, which facilitates the operator to quickly cut off the power in an emergency and ensure operational safety.

[0203] Based on the above disclosure, the embodiments of this application construct an RF explosion-proof test device that integrates RF excitation, electromagnetic transmission, discharge excitation, explosion response, explosion gas configuration and concentration monitoring. It has closed-loop control capability, supports automatic gas mixing, concentration detection, power adjustment and explosion response linkage, and improves the automation level, safety and reproducibility of the test process.

[0204] Figure 9 A flowchart of a radio frequency explosion-proof test method according to an embodiment of this application is shown.

[0205] A second aspect of this application provides a radio frequency explosion-proof testing method, applied to any of the radio frequency explosion-proof testing devices described in the first aspect, the method comprising:

[0206] Step S10. When the first electrode receives a first radio frequency signal output by the radio frequency device under test at maximum power, a first control command is sent to the driving component so that the driving component responds to the first control command and drives the second electrode to move relative to the first electrode so that the second electrode and the first electrode are periodically switched on and off.

[0207] In some embodiments, after sending the first control command to the drive component, the method further includes:

[0208] Step S20. When the first electrode is in the first state and the explosion gas in the sealed explosion chamber does not explode, control the first electrode to switch from being connected to the radio frequency device under test to being connected to the calibration sub-circuit, control the calibration sub-circuit to transmit the second radio frequency signal sent by the test radio frequency source to the first electrode, and send a second control command to the driving component, so that the driving component responds to the second control command and drives the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off;

[0209] Wherein, the power of the second radio frequency signal is n times the power of the first radio frequency signal, n is greater than 1, and n is a preset safety factor that the radio frequency device under test must meet; the first state is the state in which the second electrode and the first electrode periodically switch on and off after the first electrode receives the first radio frequency signal output by the radio frequency device under test at maximum power.

[0210] In some embodiments, before controlling the calibration subcircuit to transmit the second radio frequency signal to the first electrode, the method further includes:

[0211] Step S20'. Control the calibration sub-circuit to transmit the third radio frequency signal sent by the test radio frequency source to the first electrode, and send a third control command to the driving component, so that the driving component responds to the third control command to drive the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off; wherein, the power of the third radio frequency signal is greater than the power of the first radio frequency signal;

[0212] When the first electrode is in the second state and the explosion gas in the sealed explosion chamber explodes, the step of controlling the calibration sub-circuit to transmit the second radio frequency signal to the first electrode is executed; wherein, the second state is the state in which the second electrode and the first electrode are periodically switched on and off after the first electrode receives the third radio frequency signal sent by the test radio frequency source.

[0213] For example: If the power of the third radio frequency signal is 100W and the drive motor is started, and an explosion occurs under the same working conditions (e.g., the motor speed is 400 r / min and the test equipment works continuously for 6 minutes), it indicates that the preliminary test results of the tested radio frequency equipment are valid, the system sensitivity of the test equipment is normal, and it can proceed to the safety factor calibration.

[0214] In some embodiments, after testing the system sensitivity and before calibrating the safety factor, the method further includes:

[0215] Initiate the gas scrubbing procedure. Once the gas concentration sensor detects that the concentration of the explosive gas has dropped to 0, reconfigure the target gas concentration.

[0216] Understandably, since an explosion occurred inside the sealed explosion chamber during the system sensitivity test, it is necessary to purge the sealed explosion chamber and prepare new explosive gas.

[0217] In some embodiments, after the safety factor is calibrated, the discharge power can be set to 100 W and the motor can be restarted. If an explosion is successfully triggered under such conditions, it can be confirmed that the test equipment is functioning normally, the tested radio frequency equipment has passed the radio frequency explosion-proof test, and the test result is valid.

[0218] In some embodiments, the method further includes:

[0219] Step S30. With the first electrode connected to the calibration sub-circuit, control the calibration sub-circuit to transmit the fourth radio frequency signal sent by the test radio frequency source to the first electrode, so that the first electrode has initial discharge power;

[0220] Step S40. Send a fourth control command to the driving component, so that the driving component responds to the fourth control command and drives the second electrode to move relative to the first electrode, so that the second electrode and the first electrode are periodically switched on and off;

[0221] Step S50. If the explosive gas in the sealed explosion chamber explodes, the discharge power of the first electrode is gradually reduced. After each reduction of the discharge power, the process returns to the step of sending the fourth control command to the drive assembly until the explosive gas in the sealed explosion chamber does not explode.

[0222] Step S60. Determine the power safety threshold of the test radio frequency source based on the discharge power of the first electrode when the explosion gas in the sealed explosion chamber does not explode.

[0223] It is understood that the radio frequency explosion-proof testing equipment in this application embodiment can also be used to conduct research on the ignition capability of radio frequency electromagnetic energy under different frequency bands and different modulation methods, thereby providing data support for experimental verification and precise determination of theoretical safety thresholds.

[0224] For example, users can select "calibration mode" on the operation panel, set the target test frequency band and modulation parameters, and ensure that the output of the test equipment is consistent with the research conditions. The initial discharge power of the first electrode is set, and the motor speed is set to 400 r / min. The servo motor is started, and the test equipment runs continuously for 6 minutes. If an explosion is observed during this period, it indicates that the current discharge power has exceeded the ignition threshold. The discharge power is then gradually reduced, and the test process is repeated until the explosive gas is no longer ignited under the same conditions. The difference in discharge power between the occurrence and non-occurrence of an explosion should be less than the difference threshold, for example, 0.1 W, indicating that the test equipment has good control accuracy and repeatability, and can meet the power resolution requirements of theoretical safety threshold research. Therefore, this method can achieve precise definition of the ignition capability of radio frequency energy of different frequency bands and modulation types in typical gas environments, providing a theoretical basis for the establishment of explosion-proof safety threshold models and standard formulation.

[0225] It is understood that the implementation principle of the method in the embodiments of this application can be referred to the foregoing text, and will not be repeated here.

[0226] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A radio frequency explosion-proof test apparatus, characterized by, The application relates to an explosion-proof testing device. The explosion-proof testing device comprises a sealed explosion chamber and a discharge mechanism, the sealed explosion chamber is configured to be filled with explosion gas, the discharge mechanism comprises a discharge electrode and a driving assembly, the discharge electrode is arranged in the sealed explosion chamber, the discharge electrode comprises a first electrode and a second electrode, the first electrode is configured to be connected with a radio frequency device under test to receive a first radio frequency signal output by the radio frequency device under test at maximum power, and the second electrode is connected with the driving assembly; a test circuit comprises a processing sub-circuit, the processing sub-circuit is configured to send a first control instruction to the driving assembly when the first electrode receives the first radio frequency signal output by the radio frequency device under test at maximum power; the driving assembly is configured to drive the second electrode to move relative to the first electrode to make the second electrode periodically turn on and off relative to the first electrode in response to the first control instruction; the test circuit further comprises: a calibration sub-circuit electrically connected with the processing sub-circuit and configured to receive a second radio frequency signal sent by a test radio frequency source, wherein the power of the second radio frequency signal is n times the power of the first radio frequency signal, n is greater than 1, and n is a preset safety factor required by the radio frequency device under test; the processing sub-circuit is further configured to control the first electrode to switch from being connected with the radio frequency device under test to being connected with the calibration sub-circuit, control the calibration sub-circuit to transmit the second radio frequency signal to the first electrode, and send a second control instruction to the driving assembly when the first electrode is in a first state and the explosion gas in the sealed explosion chamber does not explode; wherein the first state is a state in which the second electrode periodically turns on and off relative to the first electrode after the first electrode receives the first radio frequency signal output by the radio frequency device under test at maximum power; the driving assembly is further configured to drive the second electrode to move relative to the first electrode to make the second electrode periodically turn on and off relative to the first electrode in response to the second control instruction.

2. The explosion-proof testing apparatus according to claim 1, characterized by The test circuit further comprises: a first gating switch comprising a first connection end, a second connection end, a third connection end and a first control end, the first control end is electrically connected with the processing sub-circuit, the first connection end is electrically connected with the first electrode, the second connection end is electrically connected with the radio frequency device under test, and the third connection end is electrically connected with the test radio frequency source; the first control end is electrically connected with the processing sub-circuit and is configured to be connected with the first connection end and the third connection end or to be connected with the first connection end and the second connection end.

3. The explosion-proof testing apparatus according to claim 1, characterized by The test circuit further comprises: a power measurement sub-circuit comprising a second gating switch, a third gating switch, a first power meter and a plurality of directional couplers; The second gating switch comprises a first input end, a second control end and a plurality of first output ends, the first input end is connected with the measured radio frequency device or the test radio frequency source, each first output end is connected with a first end of one directional coupler, the second control end is electrically connected with the processing sub-circuit and is configured to be connected with the first input end and one of the first output ends; The third gating switch comprises a plurality of second input ends, a third control end and a second output end, each second input end is connected with a second end of one directional coupler, the second output end is connected with the first electrode, the third control end is electrically connected with the processing sub-circuit and is configured to be connected with the second output end and one of the second input ends; The first power meter is connected with a third end of one directional coupler and is configured to measure a first power output by the third end of the directional coupler; The working frequency bands of different directional couplers are at least partially different, and in the case that the directional coupler is connected with the measured radio frequency device or the test radio frequency source through the second gating switch, the working frequency band of the directional coupler is adapted to the working frequency band of the measured radio frequency device or the test radio frequency source.

4. The explosion-proof testing apparatus according to claim 3, characterized by The power measurement sub-circuit further comprises: A second power meter configured to measure a second power output by the first electrode; The processing sub-circuit is further configured to perform feedback adjustment on the output power of the test radio frequency source according to the first power and the second power.

5. The explosion-proof testing apparatus according to claim 3, wherein The test circuit further comprises: A protection sub-circuit comprising a fourth gating switch, a fifth gating switch, a load and a plurality of circulators; The fourth gating switch comprises a third input end, a fourth control end and a plurality of third output ends, the third input end is connected with the second output end of the third gating switch, each third output end is connected with a first end of one circulator, the fourth control end is electrically connected with the processing sub-circuit and is configured to be connected with the third input end and one of the third output ends; The fifth gating switch comprises a plurality of fourth input ends, a fifth control end and a fourth output end, each fourth input end is connected with a second end of one circulator, the fourth output end is connected with the first electrode, the fifth control end is electrically connected with the processing sub-circuit and is configured to be connected with the fourth output end and one of the fourth input ends; The load is connected with a third end of one circulator; The working frequency bands of different circulators are at least partially different, and in the case that the circulator is connected with the directional coupler through the third gating switch and the fourth gating switch, the working frequency band of the circulator is adapted to the working frequency band of the directional coupler.

6. The radio frequency explosion proof test apparatus of claim 5, wherein, The total working frequency band of the plurality of directional couplers is DC-6GHz, and the total working frequency band of the plurality of circulators is DC-6GHz; Each of the directional couplers has a first operating frequency band, each of the circulators has a second operating frequency band, and the total operating frequency band is a frequency band between a lower limit value of the smallest first operating frequency band and an upper limit value of the largest first operating frequency band, or a frequency band between a lower limit value of the smallest second operating frequency band and an upper limit value of the largest second operating frequency band.

7. The radio frequency explosion proof test apparatus of claim 1, wherein, The first electrode is a metal rod, and the second electrode is a metal disc, the metal disc comprising a contact portion and oppositely arranged first and second notches. The driving assembly is configured to drive the metal disc to move radially relative to the metal rod, so that the metal disc is conductive with the metal rod when the contact portion is in contact with the metal rod, and the metal disc is disconnected from the metal rod when the first notch or the second notch is arranged opposite to the metal rod.

8. The radio frequency explosion proof test apparatus of claim 1, wherein, The driving assembly comprises: a driving motor having a through hole arranged in a target direction; a rotating shaft connected with the second electrode, the rotating shaft being arranged in the through hole, a length direction of the rotating shaft being parallel to the target direction, and an outer wall of the rotating shaft being connected with the driving motor; a coaxial rotating joint connected with an inner wall of the rotating shaft.

9. The radio frequency explosion proof test apparatus of claim 1, wherein, Further comprising: a first interface connected with the first electrode through a first radio frequency transmission line and configured to be connected with the measured radio frequency device through a second radio frequency transmission line; and / or a second interface and an antenna connected with each other, the second interface being connected with the first electrode through the first radio frequency transmission line, and the antenna being configured to be wirelessly connected with the measured radio frequency device.

10. The radio frequency explosion proof test apparatus of claim 9, wherein, The first radio frequency transmission line and / or the second radio frequency transmission line is a coaxial cable, and a size parameter of the second electrode matches an impedance of the coaxial cable.

11. The radio frequency explosion proof test apparatus of claim 1, wherein, Further comprising: a gas distribution circuit comprising a first air inlet pipeline, a second air inlet pipeline, a gas mixing chamber, a third air inlet pipeline, and an air outlet pipeline; the first air inlet pipeline is configured to transport air, the second air inlet pipeline is configured to transport combustible gas, the first air inlet pipeline and the second air inlet pipeline are in communication with the gas mixing chamber, and the air and the combustible gas are mixed in the gas mixing chamber to form the explosion gas; the gas mixing chamber is in communication with the third air inlet pipeline, the third air inlet pipeline is in communication with the sealed explosion chamber, and the air outlet pipeline is in communication with the sealed explosion chamber.

12. The radio frequency explosion proof test apparatus of claim 11, wherein, The gas distribution circuit further comprises: a first flow meter arranged on the first air inlet pipeline; a second flow meter arranged on the second air inlet pipeline; a gas concentration sensor configured to detect the concentration of the explosion gas in the sealed explosion chamber; the processing sub-circuit is further configured to adjust the first flow meter and / or the second flow meter according to the concentration of the explosion gas to adjust the air inlet flow rate of the first air inlet pipeline and / or the air inlet flow rate of the second air inlet pipeline.

13. The radio frequency explosion proof testing apparatus of any of claims 1-12, wherein, Further comprising: a test cabinet comprising a cabinet body, the cabinet body being provided with a containing cavity, and the test circuit is arranged in the containing cavity, and / or the explosion-proof test device comprises a gas distribution circuit, and the gas distribution circuit is arranged in the containing cavity.

14. The radio frequency explosion proof test apparatus of claim 13, wherein, The cabinet body comprises an operation panel provided with an operation screen connected with the processing sub-circuit, and the operation screen is provided with a key for triggering the processing sub-circuit to send a control instruction in response to a control operation of a user.

15. The radio frequency explosion proof test apparatus of claim 13, wherein, The test cabinet further comprises an operation table protruding from the cabinet body and provided with a mounting groove; The explosion-proof testing device further comprises: The pressing structure comprises a support plate and a bracket, the bracket is arranged on the support plate, and the support plate is embedded in the mounting groove; The transparent cover is arranged on the support plate, and the transparent cover and the support plate form the sealed explosion chamber above the surface of the operation table.

16. The radio frequency explosion proof test apparatus of claim 13, wherein, The cabinet body is provided with a heat dissipation assembly, a cabinet door and a pulley; The heat dissipation assembly comprises heat dissipation fins and a heat dissipation fan, the cabinet door comprises first and second cabinet doors arranged on opposite sides of the cabinet body, and the pulley is arranged below the cabinet body.

17. A radio frequency explosion-proof testing method, characterized in that, The method is applied to the radio frequency explosion-proof testing device as claimed in any one of claims 1-16, and the method comprises: In a case where the first electrode receives a first radio frequency signal output by the measured radio frequency device at maximum power, a first control instruction is sent to the driving assembly, so that the driving assembly drives the second electrode to move relative to the first electrode in response to the first control instruction, so that the second electrode periodically connects and disconnects with the first electrode; After the first control instruction is sent to the driving assembly, the method further comprises: In a case where the first electrode is in a first state and the explosion gas in the sealed explosion chamber does not explode, the first electrode is controlled to switch from being connected to the measured radio frequency device to being connected to the calibration sub-circuit, the calibration sub-circuit is controlled to transmit a second radio frequency signal sent by a test radio frequency source to the first electrode, and a second control instruction is sent to the driving assembly, so that the driving assembly drives the second electrode to move relative to the first electrode in response to the second control instruction, so that the second electrode periodically connects and disconnects with the first electrode; Wherein, the power of the second radio frequency signal is n times the power of the first radio frequency signal, n is greater than 1, n is a preset safety factor required by the measured radio frequency device; the first state is a state in which the second electrode periodically connects and disconnects with the first electrode after the first electrode receives the first radio frequency signal output by the measured radio frequency device at maximum power.

18. The radio frequency explosion proof testing method of claim 17, wherein, Before the calibration sub-circuit is controlled to transmit the second radio frequency signal to the first electrode, the method further comprises: The calibration sub-circuit is controlled to transmit a third radio frequency signal sent by a test radio frequency source to the first electrode, and a third control instruction is sent to the driving assembly, so that the driving assembly drives the second electrode to move relative to the first electrode in response to the third control instruction, so that the second electrode periodically connects and disconnects with the first electrode; wherein, the power of the third radio frequency signal is greater than the power of the first radio frequency signal; In the case that the explosion gas in the sealed explosion cavity explodes when the first electrode is in a second state, the step of controlling the calibration sub-circuit to transmit the second radio frequency signal to the first electrode is performed; wherein the second state is a state in which the second electrode periodically opens and closes with the first electrode after the first electrode receives a third radio frequency signal sent by the test radio frequency source.

19. The radio frequency explosion proof testing method of claim 17, wherein, The method further comprises: In the case that the first electrode is connected with the calibration sub-circuit, a fourth radio frequency signal sent by a test radio frequency source is transmitted to the first electrode by controlling the calibration sub-circuit, so that the first electrode has an initial discharge power; A fourth control instruction is sent to the driving assembly, so that the driving assembly drives the second electrode to move relative to the first electrode in response to the fourth control instruction, so that the second electrode periodically opens and closes with the first electrode; If the explosion gas in the sealed explosion cavity explodes, the discharge power of the first electrode is gradually reduced, and after each reduction of the discharge power, the step of sending the fourth control instruction to the driving assembly is returned to be performed until the explosion gas in the sealed explosion cavity does not explode; According to the discharge power of the first electrode when the explosion gas in the sealed explosion cavity does not explode, a power safety threshold of the test radio frequency source is determined.

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