A water-cooled electric vibration system and control method suitable for explosive environments

Abstract

The application provides a water-cooled electric vibration system and control method suitable for explosive environment, and relates to the technical field of vibration table application, and comprises a table body device, a water-cooling unit, a positive pressure unit and an electrical unit; the table body device comprises, from top to bottom, a compression ring, a moving ring framework, an upper cover plate, a cover plate support ring, an upper guide ring, an upper pole plate, a magnetic steel ring, a lower pole plate and a lower cover, which are connected in sequence, and the connection parts of the components are all sealed through sealing assemblies; the positive pressure unit comprises a positive pressure system and a purging device, the positive pressure unit is in air communication with the table body device, and is used for maintaining a positive pressure environment inside the table body device; the water-cooling unit is embeddedly connected with internal components and devices of the table body device, and is used for cooling the table body device; and the electrical unit is sealingly connected with the table body device, and provides power and control support for the system. The application changes the inside of the electric vibration table into a positive pressure design, avoids the entry of combustible gas or combustible dust into the inside of the equipment, and avoids the occurrence of explosion during testing.

Description

Technical Field

[0001] This invention belongs to the field of vibration table application technology, and relates to a water-cooled electric vibration system and control method suitable for explosive environments. Background Technology

[0002] Using an electric vibration table as environmental reliability testing equipment is an essential testing method in the laboratory to reflect the adaptability of the test component to changes in vibration environment during transportation and actual working environments, expose product defects, and conduct new product development, prototype testing, and product qualification testing throughout the entire process. With the rapid development of aerospace, weaponry, shipbuilding, electronics, and automotive industries, the range of test components is becoming increasingly broad, often involving hazardous gases. When a hazardous gas leak occurs during vibration testing of the test component, it may transform a safe experimental environment into an explosive one.

[0003] With increasing awareness of safety in domestic production and intensified safety supervision, all equipment entering explosive environments must have appropriate explosion-proof designs to prevent accidents caused by high temperatures, electrical sparks, and electric arcs generated during equipment operation. However, there are no specially designed electric vibration tables for explosive environments on the market.

[0004] Therefore, in order to produce explosion-proof electric vibration tables that can be widely used in product research and development and quality inspection in industries such as aerospace, military, automotive, and electronics, especially those that need to be tested for vibration performance in hazardous environments, there is an urgent need for a vibration system suitable for explosive environments to avoid explosions during testing. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a water-cooled electric vibration system and control method suitable for explosive environments. The system transforms the interior of the electric vibration table into a positive pressure design, preventing flammable gases or dust from entering the equipment and coming into contact with the electronic components to create explosive conditions, thus achieving explosion protection and enabling the electric vibration table to be used in explosive environments.

[0006] To achieve the above objectives, the present invention provides a water-cooled electric vibration system suitable for explosive environments, comprising: The platform assembly comprises a platform body, a water-cooling unit, a positive pressure unit, and an electrical unit. The platform body, from top to bottom, includes a pressure ring, a moving ring skeleton, an upper cover plate, a cover plate support ring, an upper guide ring, an upper electrode plate, a magnet ring, a lower electrode plate, and a lower cover. All connections between the components are sealed by sealing assemblies. The positive pressure unit includes a positive pressure system and a purging device. The positive pressure unit is connected to the air passage of the platform device to maintain a positive pressure environment inside the platform device. The water cooling unit is embedded in the internal components of the platform device to cool the platform device. The electrical unit is sealed to the platform device to provide power and control support for the system.

[0007] As a further improvement of the present invention, the sealing assembly includes a silicone ring or silicone pad disposed at the joint gap of each component, and the moving ring skeleton and the upper cover plate adopt a rolling film sealing structure; one end of the rolling film is locked to the moving ring skeleton by a clamp, and the other end is pressed to the upper cover plate by a pressure ring, and the upper cover plate is provided with a wedge-shaped opening adapted to the rolling film.

[0008] As a further improvement of the present invention, both ends of the rolling film are provided with protrusions, which are used to lock under the clamp when the clamp vibrates and loosens to prevent the rolling film from flying out; the rolling film is folded into an inverted U-shape during installation, and the clamp is wrapped inside the inverted U-shape of the rolling film.

[0009] As a further improvement of the present invention, the upper and lower electrode plates inside the platform are respectively provided with an upper electrode plate connecting air hole and a lower electrode plate connecting air hole, the lower cover is provided with a lower cover air inlet, the cover plate support ring is provided with a cover plate support ring air outlet, and the lower cover air inlet, the lower electrode plate connecting air hole, the upper electrode plate connecting air hole and the cover plate support ring air outlet are spirally connected. The purging device of the positive pressure unit is connected to the inside of the platform through the air inlet of the lower cover, and the positive pressure system is connected to the inside of the platform through the air outlet of the cover support ring. Clean gas is drawn in from the purging device and enters the inside of the platform through the air inlet of the lower cover. It then passes through the air hole of the lower electrode plate, the inside of the magnet ring, and the air hole of the upper electrode plate in sequence, and finally flows out from the air outlet of the cover support ring and is discharged outdoors through the positive pressure system.

[0010] As a further improvement of the present invention, the output gas flow rate of the positive pressure unit is greater than the input gas flow rate, and the diameter of the air inlet of the lower cover is smaller than the diameter of the air outlet of the cover plate support ring. Set the purging time T1, T1=V / Q, where V represents the internal cavity volume of the platform device and Q represents the gas flow rate. After the purging time T1, the air inside the platform device is replaced.

[0011] As a further improvement of the present invention, the positive pressure system is equipped with a pressure sensor for detecting the internal pressure of the platform device; the pressure P1 is set to be greater than 50 Pa, and the pressure P2 is determined according to the formula P2S=(m1+m2)g, where m1 is the weight of the moving coil skeleton, m2 is the minimum weight of the test piece, g is the minimum acceleration of the equipment, and S is the cross-sectional area of ​​the moving coil skeleton. When the internal pressure of the platform is P1≤P≤P2, it maintains normal operation; when the pressure is higher than P2, it reduces pressure and resets the moving coil frame; if the pressure continues to rise, it will alarm and shut down; when the pressure is lower than P1, it starts the purging device to increase the pressure; if it cannot reach P1, it will alarm and shut down.

[0012] As a further improvement of the present invention, the water-cooling unit includes a water-cooling cabinet, external water pipe connectors, a copper inlet water pipe, a copper outlet water pipe, a copper water pipe busbar, and water pipes; the copper inlet water pipe and the copper outlet water pipe are both embedded inside the platform device, extending from the lower electrode plate to the cover plate support ring, forming an embedded connection with the platform device, and their upper ends are both located in the moving coil skeleton area; the two external water pipe connectors are installed on the outside of the lower cover by screws and extend into the inside of the lower cover, and are sealed by a sealing component, and the inner ends of the two external water pipe connectors are respectively connected to the lower end of the copper inlet water pipe and the lower end of the copper outlet water pipe; The cooling water of the water-cooled cabinet flows from bottom to top into the moving coil skeleton area inside the platform device through the external connector of the water pipe connected to the copper water inlet pipe, cooling the moving coil skeleton area, and then flows from top to bottom through the external connector of the water pipe connected to the copper water outlet pipe, returning to the water-cooled cabinet.

[0013] As a further improvement of the present invention, the water cooling unit includes at least one water inlet channel and one water outlet channel, and the external connector of the water pipe is designed as a multi-inlet pipe connector or a multi-outlet pipe connector; the copper busbar of the water pipe is used to clamp the copper inlet water pipe or the copper outlet water pipe and is fixed to the lower cover by screws.

[0014] As a further improvement of the present invention, the electrical unit includes a power amplifier, an explosion-proof gland, and a copper busbar for wire pressing; the electrical unit forms a sealed connection with the platform device through the explosion-proof gland, and adopts a connection method in which a single wire corresponds to a single explosion-proof gland. The diameter of the part of the wire pressed against the copper busbar is less than or equal to the diameter of the wire entry point in the copper busbar, and the diameter of the wire entry point in the copper busbar is less than or equal to the overall outer diameter of the wire.

[0015] The present invention also provides a control method for a water-cooled electric vibration system suitable for use in explosive environments, comprising the following steps: The user sets the weight of the test piece and the test pattern, and the positive pressure system calculates the purging time T1. Before the platform device is started, the positive pressure unit is activated to deliver clean gas into the platform device and complete the internal air replacement; After the purging device starts for T1, the positive pressure system detects the pressure P of the platform. If P1≤P≤P2, the platform starts and the positive pressure system continues to run. If P<P1, the purging device continues to run. If P1 is not reached after the preset time T2, the positive pressure system alarms and the platform does not start. Here, P1 and P2 are the preset lower and upper limits of positive pressure in the platform, respectively. When the moving coil skeleton drives the specimen to move, the positive pressure system intelligently adjusts the pressure values ​​P1 and P2 according to the specimen weight, test displacement and real-time acceleration. If the internal pressure of the platform is abnormal during operation, the positive pressure unit will alarm, the platform will stop operating first, and the positive pressure unit will then stop to prevent dangerous gases and dust from entering.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention modifies the water-cooled vibration table, enabling a fully sealed table body. A positive pressure unit is added, allowing for thorough internal cleaning of the table body before startup and intelligent adjustment during operation to maintain a positive pressure environment without affecting equipment operation. This invention avoids explosions caused by electrical sparks during startup and prevents the high temperatures generated during operation from igniting explosive gases or dust, significantly improving the safety of the electric vibration table and enabling it to operate in explosive environments.

[0017] This invention provides a water-cooled electric vibration system and control method for use in explosive environments. The system and control method ensure that the water-cooling pipes, wiring methods and clean gas flow channels do not interfere with each other, and maintain the internal pressure of the vibration equipment higher than the external environmental pressure without affecting the operation of the equipment. This prevents dangerous gases and dust from entering the equipment, limits the generation of explosive environments, and achieves the purpose of explosion protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a water-cooled electric vibration system suitable for explosive environments, as disclosed in one embodiment of the present invention. Figure 2 This is an exploded view of the overall assembly of the platform device according to one embodiment of the present invention; Figure 3 This is an enlarged view of sealing component A disclosed in one embodiment of the present invention; Figure 4 This is an enlarged view of the sealing component B disclosed in one embodiment of the present invention; Figure 5 This is a detailed diagram of the internal water-cooling unit and positive pressure unit of the platform device disclosed in one embodiment of the present invention; Figure 6 This is a cross-sectional view of an external water pipe connector disclosed in one embodiment of the present invention; Figure 7 This is a schematic diagram of the external connector and internal structure of a water pipe according to an embodiment of the present invention; Figure 8 This is a flowchart of a control method for a water-cooled electric vibration system suitable for use in an explosive environment, as disclosed in one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Platform assembly; 11. Moving coil frame; 12. Pressure ring; 13. Upper cover plate; 14. Cover plate support ring; 15. Upper guide ring; 16. Upper electrode plate; 17. Magnet ring; 18. Lower electrode plate; 19. Lower cover; 120. Sealing assembly; 1201. Clamp; 1202. Roller film; 1203. Soft rubber strip; 1204. Groove; 141. Air outlet of cover plate support ring; 161. Air vent connecting the upper electrode plate; 181. Air vent connecting the lower electrode plate. Vent hole; 191, lower cover air inlet; 2, positive pressure unit; 21, positive pressure system; 22, purging device; 211, positive pressure system exhaust port; 3, water cooling unit; 31, water cooling cabinet; 32, external water pipe connector; 33, copper inlet water pipe; 34, copper outlet water pipe; 35, copper water pipe busbar; 36, water pipe; 4, electrical unit; 41, power amplifier; 42, explosion-proof gland; 43, copper wire busbar; 431, wire entry point. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings: like Figure 1 As shown, the present invention provides a water-cooled electric vibration system suitable for explosive environments, which is mainly composed of a platform device 1, a water-cooling unit 3, a positive pressure unit 2, and an electrical unit 4. The units work together to achieve safe vibration testing in explosive environments. During the test, the positive pressure unit 2 includes a positive pressure system 21 and a purging device 22. The positive pressure unit 2 is connected to the platform device 1 through the air passage to maintain the positive pressure environment inside the platform device 1. The water-cooling unit 3 is embedded in the internal components of the platform device 1 to cool the platform device 1. The electrical unit 4 is sealed to the platform device 1 to provide power and control support for the system.

[0022] (1) Assembly of platform device 1 like Figure 2As shown, the platform device 1 is the core load-bearing component of the system. From top to bottom, it is precisely assembled with the following components in the following order: pressure ring 12, moving ring frame 11, upper cover plate 13, cover plate support ring 14, upper guide ring 15, upper electrode plate 16, magnet ring 17, lower electrode plate 18, and lower cover 19. The components are stably connected by bolts or snap-fit ​​structures to ensure no relative displacement during vibration.

[0023] Sealing components 120 are installed at all component connections: For static fit gaps, such as the connections between the cover plate support ring 14 and the upper guide ring 15, the upper electrode plate 16 and the magnet ring 17, and the lower electrode plate 18 and the lower cover 19, grooves 1204 are made on the mating surfaces to embed silicone rings or silicone pads. Figure 3 As shown, static sealing is achieved through the clamping force of the component connections; as Figure 4 As shown, for the dynamic mating parts between the moving coil frame 11 and the upper cover plate 13, a rolling diaphragm 1202 sealing structure is adopted. The rolling diaphragm 1202 is made of fluororubber, which has both soft elasticity and wear resistance. One end of the rolling diaphragm 1202 is locked in the annular groove of the moving coil frame 11 by a stainless steel clamp 1201. The tightening torque of the clamp 1201 is controlled at 25-30 N·m to prevent it from coming off when it loosens due to vibration, thus preventing it from flying out and causing safety hazards. The other end is pressed into the wedge-shaped opening of the upper cover plate 13 by a pressure ring 12. The inclination angle of the wedge-shaped opening is set to 30° to ensure that the rolling diaphragm 1202 and the upper cover plate 13 fit tightly. The roller film 1202 has pre-made bosses at both ends, with a boss thickness of 5mm. When the clamp 1201 becomes slightly loose due to long-term vibration, the bosses can be locked under the clamp 1201 to form a mechanical limit and prevent the roller film 1202 from flying out. During installation, the roller film 1202 is folded into an inverted U-shape so that the clamp 1201 is completely wrapped inside the inverted U-shape, avoiding direct friction between the roller film 1202 and the upper end of the clamp 1201, thus extending the service life of the roller film 1202.

[0024] Connecting vents are machined on the upper electrode plate 16 and the lower electrode plate 18, respectively. An air inlet is provided at the bottom of the lower cover 19, and an air outlet is provided on the side of the cover plate support ring 14. The air inlet of the lower cover 19 is 90° away from the connecting vents of the lower electrode plate 18, the connecting vents of the lower electrode plate 18 are 180° away from the connecting vents of the upper electrode plate 16, and the connecting vents of the upper electrode plate 16 are 90° away from the air outlet of the cover plate support ring 14, forming a 360° spiral connecting channel around the platform device 1, ensuring that gas can flow through all areas inside the platform. The vent diameters are designed according to the gas flow requirements: the diameter of the air inlet of the lower cover 19 is 15mm, the diameter of the air outlet of the cover plate support ring 14 is 25mm, and the diameters of the connecting vents of the upper electrode plate 16 and the lower electrode plate 18 are both 20mm. Four connecting vents are evenly distributed on each electrode plate to improve the uniformity of gas flow.

[0025] (2) Assembly of positive pressure unit 2 The positive pressure unit 2 consists of a positive pressure system 21 and a purging device 22. The purging device 22 uses an oil-free scroll air compressor to output clean and dry compressed air, such as... Figure 5 As shown, its air outlet is sealed to the air inlet of the lower cover 19 via a high-pressure hose. Both ends of the hose are secured with clamps and wrapped with sealing tape to ensure no air leakage. The positive pressure system 21 includes a pressure sensor, a flow controller, a pressure relief valve, and an exhaust pipe. The pressure sensor is installed inside the cover plate support ring 14 to monitor the internal pressure of the platform in real time, with a detection accuracy of ±1 Pa. The flow controller is connected in series with the exhaust pipe to regulate the output gas flow rate. The pressure relief valve is set to open at a pressure of P2+5 Pa, automatically releasing pressure when the internal pressure of the platform exceeds the set value. The air inlet of the positive pressure system 21 is connected to the air outlet of the cover plate support ring 14 via a pipe, and the exhaust end extends to a safe outdoor area to ensure that the discharged gas does not cause secondary safety hazards.

[0026] (3) Assembly of water-cooled unit 3 The water-cooling unit 3 includes a water-cooling cabinet 31, external water pipe connectors 32, a copper inlet water pipe 33, a copper outlet water pipe 34, a copper water pipe busbar 35, and water pipes 36. Both the copper inlet water pipe 33 and the copper outlet water pipe 34 are made of pure copper, with a diameter of 12mm and a wall thickness of 2mm. They are pre-embedded inside the platform device 1, extending from the bottom of the lower electrode plate 18 to the cover plate support ring 14, and extending upwards to within a 30mm radius around the moving coil frame 11, forming a ring-shaped cooling pipeline. The two external water pipe connectors 32 are fixedly installed on the outside of the lower cover 19 using M8 screws. A soft rubber strip 1203 is installed to seal the contact area between the connector and the lower cover 19. The inner ends of the connectors are fixedly connected to the lower ends of the copper inlet water pipe 33 and the copper outlet water pipe 34 respectively by welding, ensuring a leak-free seal. The copper water pipe busbar 35 is made of brass and is fixed to the inside of the lower cover 19 with screws, clamping the copper inlet water pipe 33 and the copper outlet water pipe 34 to prevent the water pipe 36 from bending and breaking due to vibration. The water-cooled cabinet 31 uses an industrial-grade chiller with a cooling capacity of 5kW. Its outlet is connected to the external water pipe connector 32 corresponding to the copper inlet water pipe 33 via the water pipe 36, and its return outlet is connected to the external water pipe connector 32 corresponding to the copper outlet water pipe 34 via the water pipe 36, forming a closed cooling loop. According to cooling requirements, multiple branch interfaces can be added to the external water pipe connector 32 to achieve multiple water inlets or outlets.

[0027] (4) Assembly of electrical unit 4 Electrical unit 4 includes a power amplifier 41, an explosion-proof gland 42, and a copper busbar 43. The power amplifier 41 is a high-frequency power amplifier with an output power of 10kW, meeting the high-frequency vibration requirements of the moving coil frame 11. The explosion-proof gland 42 is an IIB-grade explosion-proof standard product, installed in a pre-drilled hole on the side of the lower cover 19, and connected to the lower cover 19 via a threaded connection with a sealing gasket. Figure 6As shown, the copper busbar 43 is made of copper and is fixed inside the platform device 1. The diameter of its wire entry point 431 is designed according to the wire specifications, such as... Figure 7 As shown, a single wire is used in connection with a single explosion-proof gland connector. Flame-retardant cables are selected, and after stripping the outer insulation, they are secured to the copper busbar 43 with screws. Figure 6 As shown; ensure that the diameter of the crimped part of the wire and the copper busbar 43 is less than or equal to the diameter of the wire entry point 431 in the copper busbar 43 and less than or equal to the overall outer diameter of the wire. In this embodiment, the diameter of the wire in the crimped part is 4mm, the diameter of the wire entry point 431 is 4.5mm, and the overall outer diameter of the wire is 5mm, so as to achieve a tight clamping of the wire by the explosion-proof gland 42, preventing the entry of external dangerous gases and dust. The wire can also use a pin connector, and no specific requirements are made.

[0028] (5) System parameter settings The lower limit of the positive pressure inside the platform is set to P1 = 60 Pa, which is higher than the minimum requirement of 50 Pa to ensure the explosion-proof effect. The upper limit of the positive pressure P2 is determined according to the formula P2S = (m1 + m2)g, where m1 is the weight of the moving coil frame 11, which is 50 kg in this embodiment; m2 is the minimum weight of the test piece, which is taken as m2 = 10 kg; and g is the minimum acceleration of the equipment, which is taken as g = 10 m / s². 2 S is the cross-sectional area of ​​the moving coil frame 11, and the diameter of the moving coil frame 11 is 300mm. S = π × (0.3 / 2) 2 ≈0.0707m², calculated to be P2=(50+10)×10 / 0.0707≈8486pa, set P2=8500pa.

[0029] The purging time T1 is determined according to the formula T1=V / Q, where V is the internal cavity volume of the platform, calculated to be V=0.1m³, and Q is the gas flow velocity, set to Q=0.02m. 3 / s, yielding T1=0.1 / 0.02=5s, meaning that the air replacement inside the platform is completed 5s after the purging device 22 starts. The preset time T2=10s, if the internal pressure of the platform still does not reach P1 after 10s of purging time, the system will activate the alarm.

[0030] The water-cooled cabinet 31 is set with an inlet water temperature of 20℃ and an outlet water temperature of 30℃. The cooling water flow rate is adjusted to 5L / min through a flow valve to ensure that the heat generated by the moving coil frame 11 during high-frequency vibration can be carried away in time, and to maintain the internal temperature of the platform device 1 below 40℃.

[0031] like Figure 8 As shown, the present invention provides a control method for a water-cooled electric vibration system suitable for use in explosive environments, based on the system of any one of claims 1 to 9, comprising the following steps: (1) Preparation stage The user fixes the test piece onto the moving coil frame 11 and sets the weight of the test piece (20kg in this embodiment) and the test spectrum (such as a sinusoidal vibration spectrum, frequency range 10-2000Hz, acceleration 5-20m / s²) through the control system. 2 The positive pressure system 21 automatically calculates the purging time T1=5s based on the set weight of the test piece, the volume of the cavity inside the platform, and the gas flow rate.

[0032] (2) Purging and replacement stage Before the platform device 1 is started, the positive pressure unit 2 is started first, and the purging device 22 begins to deliver clean gas into the platform device 1. The gas enters the platform through the air inlet of the lower cover 19, flows through the connecting air hole of the lower electrode plate 18, the inside of the magnetic ring 17, and the connecting air hole of the upper electrode plate 16 in sequence along the spiral connecting channel, and flows out from the air outlet of the cover plate support ring 14. It is discharged to the outside through the positive pressure system 21. The complete replacement of the air inside the platform is completed within T1=5s, removing any dangerous gases and dust that may be present inside.

[0033] (3) Initiation judgment phase After the purging device 22 has been running for 5 seconds (T1=5s), the positive pressure system 21 detects the internal pressure P of the platform via a pressure sensor. If P is within the range of 60 Pa ≤ P ≤ 8500 Pa, it indicates that a stable positive pressure environment has been formed inside the platform. The platform device 1 starts, and the positive pressure system 21 continues to operate to maintain the internal positive pressure. If P < 60 Pa, the purging device 22 continues to operate. If the operating time exceeds T2=10s and the internal pressure of the platform still has not reached P1, the positive pressure system 21 activates an audible and visual alarm, while the platform device 1 does not start, prompting the operator to check for gas leaks.

[0034] (4) Operation and adjustment phase After the platform device 1 is started, the moving coil frame 11 drives the test piece to move up and down at high frequency according to the set test pattern. During the movement, the internal pressure will fluctuate. The positive pressure system 21 collects the test piece weight, test displacement, and real-time acceleration data in real time, and intelligently adjusts the pressure values ​​P1 and P2. For example, when the test piece weight increases, the test displacement increases, or the real-time acceleration increases, the set values ​​of P1 and P2 are appropriately increased to ensure that the internal pressure of the platform is always higher than the external ambient pressure, preventing dangerous gases and dust from entering.

[0035] (5) Exception handling stage During the operation of the platform device 1, if the pressure sensor detects that the internal pressure of the platform is higher than P2=8500pa, the positive pressure system 21 controls the pressure relief valve to open and reduce pressure, and controls the moving coil frame 11 to reset; if the pressure continues to rise above 9000pa, the positive pressure unit 2 alarms and stops; if the pressure is detected to be lower than P1=60pa, the purging device 22 is started to increase the pressure. If the pressure cannot return to P1 or above within 3 seconds, the positive pressure unit 2 alarms, the platform device 1 stops operating first, and the positive pressure unit 2 stops subsequently to prevent dangerous gases and dust from entering the interior of the platform device 1, and at the same time, the operator is notified to check the equipment.

[0036] (6) Shutdown phase After the test is completed, the user stops the equipment through the control system. The platform device 1 stops vibrating first, the positive pressure unit 2 continues to run for 30 seconds to ensure that the residual gas inside the platform is discharged before stopping. The water cooling unit 3 continues to run for 10 minutes after the platform device 1 stops to cool the moving coil frame 11 and related components, and then automatically stops.

[0037] This embodiment ensures that the water-cooled pipes, wiring methods and clean gas flow channels do not interfere with each other through the precise assembly of each unit, reasonable parameter setting and orderly control process. The internal environment of the platform device 1 is always kept stable and positive pressure, which effectively prevents dangerous gases and dust from entering and realizes safe and reliable vibration testing in explosive environments.

[0038] Advantages of this invention: The system of this invention boasts reliable explosion-proof performance and is suitable for hazardous environments. It employs a fully sealed + positive pressure synergistic design: all gaps in the platform components are sealed omnidirectionally using silicone rings, silicone pads, or roller films. Simultaneously, the positive pressure unit continuously delivers clean gas, maintaining an internal pressure higher than the external environment (P1 > 50 Pa), fundamentally preventing hazardous gases and dust from entering the equipment and avoiding explosive conditions. Breakthrough in dynamic sealing technology: For the special scenario of high-frequency vibration of the moving coil frame, an innovative inverted U-shaped roller film sealing structure is adopted, combined with a boss anti-detachment design and a clamp wrapping design, ensuring sealing effectiveness while preventing frictional failure caused by high-frequency vibration, solving the sealing problem of dynamic parts. Intelligent pressure control: Real-time monitoring via pressure sensors automatically realizes pressurization, depressurization, or shutdown alarms. The pressure limit P2 is dynamically calculated based on parameters such as specimen weight and acceleration, ensuring explosion-proof performance without affecting equipment operational stability.

[0039] This invention features a multi-unit collaborative, interference-free system with high operating efficiency. The gas, water, and electrical circuits are designed independently: a spiral-shaped positive pressure gas flow channel covers all areas inside the platform; water-cooling pipes are pre-embedded inside the platform, avoiding the gas and electrical circuits; and electrical units are sealed with explosion-proof glands. These three components do not interfere with each other, ensuring thorough gas replacement, efficient cooling, and circuit safety. The gas replacement is highly efficient and thorough: a spiral flow channel is designed with "lower cover air inlet - electrode plate connecting vent - cover plate support ring air outlet," combined with flow control where "inlet diameter < outlet diameter," ensuring the output gas flow rate is greater than the input flow rate. This completes internal air replacement within the purging time T1 (V / Q), guaranteeing zero contact between electronic components and hazardous media. The cooling effect is stable: copper water-cooling pipes are pre-embedded in core heat-generating areas such as the moving coil frame, forming a closed loop from bottom to top. Multiple water inlet and outlet interfaces can be added as needed to promptly remove heat generated by high-frequency vibration, preventing safety hazards caused by high temperatures and extending the equipment's service life.

[0040] This invention features a practical structural design with ample safety redundancy. Anti-detachment and anti-failure design: the protrusions at both ends of the rolling film can lock and limit its movement when the clamp vibrates and loosens, preventing the rolling film from flying out; the inverted U-shaped installation method isolates direct friction between the rolling film and the clamp, improving the durability of the sealing components; the copper busbar for water pipes fixes the water cooling pipes, preventing vibration from causing the water pipes to tilt, break, or leak; electrical sealing compliance: adopting a "single wire + single explosion-proof gland" sealing wiring method, strictly controlling the matching degree between the wire diameter and the copper busbar entry point, ensuring a tight sealing effect, meeting the mandatory certification requirements for explosion-proof electrical systems, and preventing explosions caused by electrical sparks.

[0041] This invention is applicable to a wide range of scenarios and is convenient and intelligent to operate. It is suitable for diverse industries, including aerospace, weaponry, shipbuilding, electronics, and automotive, especially for vibration reliability testing throughout the entire process of product development, prototype testing, and qualification certification in hazardous gas environments, filling the gap in the market for dedicated explosion-proof electric vibration tables. Intelligent adaptive control: the positive pressure system dynamically adjusts the P1 and P2 pressure thresholds based on the weight of the test piece, test displacement, and real-time acceleration, eliminating the need for frequent manual intervention. It automatically completes purging and replacement before startup and automatically shuts down and alarms in case of abnormalities during operation, reducing operational difficulty and safety risks.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A water-cooled electric vibration system suitable for explosive environments, characterized in that, include: The platform assembly comprises a platform body, a water-cooling unit, a positive pressure unit, and an electrical unit. The platform body, from top to bottom, includes a pressure ring, a moving ring skeleton, an upper cover plate, a cover plate support ring, an upper guide ring, an upper electrode plate, a magnet ring, a lower electrode plate, and a lower cover. All connections between the components are sealed by sealing assemblies. The positive pressure unit includes a positive pressure system and a purging device. The positive pressure unit is connected to the air passage of the platform device to maintain a positive pressure environment inside the platform device. The water cooling unit is embedded in the internal components of the platform device to cool the platform device. The electrical unit is sealed to the platform device to provide power and control support for the system.

2. The water-cooled electric vibration system suitable for explosive environments according to claim 1, characterized in that, The sealing assembly includes silicone rings or silicone pads disposed at the joint gaps of each component, and the moving coil skeleton and the upper cover plate adopt a rolling film sealing structure; one end of the rolling film is locked to the moving coil skeleton by a clamp, and the other end is pressed onto the upper cover plate by a pressure ring, and the upper cover plate has a wedge-shaped opening adapted to the rolling film.

3. The water-cooled electric vibration system suitable for explosive environments according to claim 2, characterized in that, Both ends of the rolling film are provided with protrusions, which are used to lock under the clamp when the clamp vibrates and loosens to prevent the rolling film from flying out; when the rolling film is installed, it is folded into an inverted U-shape, and the clamp is wrapped inside the inverted U-shape of the rolling film.

4. The water-cooled electric vibration system suitable for explosive environments according to claim 1, characterized in that, The upper and lower electrode plates inside the platform are respectively provided with an upper electrode plate connecting air hole and a lower electrode plate connecting air hole. The lower cover is provided with a lower cover air inlet. The cover plate support ring is provided with a cover plate support ring air outlet. The lower cover air inlet, the lower electrode plate connecting air hole, the upper electrode plate connecting air hole and the cover plate support ring air outlet are connected in a spiral shape. The purging device of the positive pressure unit is connected to the inside of the platform through the air inlet of the lower cover, and the positive pressure system is connected to the inside of the platform through the air outlet of the cover support ring. Clean gas is drawn in from the purging device and enters the inside of the platform through the air inlet of the lower cover. It then passes through the air hole of the lower electrode plate, the inside of the magnet ring, and the air hole of the upper electrode plate in sequence, and finally flows out from the air outlet of the cover support ring and is discharged outdoors through the positive pressure system.

5. The water-cooled electric vibration system suitable for explosive environments according to claim 4, characterized in that, The output gas flow rate of the positive pressure unit is greater than the input gas flow rate, and the diameter of the air inlet of the lower cover is smaller than the diameter of the air outlet of the cover plate support ring. Set the purging time T1, T1=V / Q, where V represents the internal cavity volume of the platform device and Q represents the gas flow rate. After the purging time T1, the air inside the platform device is replaced.

6. The water-cooled electric vibration system suitable for explosive environments according to claim 1, characterized in that, The positive pressure system is equipped with a pressure sensor to detect the internal pressure of the platform device; the pressure P1 is set to be greater than 50 Pa, and the pressure P2 is determined according to the formula P2S=(m1+m2)g, where m1 is the weight of the moving coil skeleton, m2 is the minimum weight of the test piece, g is the minimum acceleration of the equipment, and S is the cross-sectional area of ​​the moving coil skeleton. When the internal pressure of the platform is P1≤P≤P2, it maintains normal operation; when the pressure is higher than P2, it reduces pressure and resets the moving coil frame; if the pressure continues to rise, it will alarm and shut down; when the pressure is lower than P1, it starts the purging device to increase the pressure; if it cannot reach P1, it will alarm and shut down.

7. The water-cooled electric vibration system suitable for explosive environments according to claim 1, characterized in that, The water-cooling unit includes a water-cooling cabinet, external water pipe connectors, copper inlet water pipes, copper outlet water pipes, copper water pipe busbars, and water pipes. The copper inlet water pipes and copper outlet water pipes are both embedded inside the platform device, extending from the lower electrode plate to the cover plate support ring to form an embedded connection with the platform device, and their upper ends are both located in the moving coil skeleton area. The two external water pipe connectors are installed on the outside of the lower cover with screws and extend into the inside of the lower cover, and are sealed by a sealing component. The inner ends of the two external water pipe connectors are respectively connected to the lower ends of the copper inlet water pipe and the copper outlet water pipe. The cooling water of the water-cooled cabinet flows from bottom to top into the moving coil skeleton area inside the platform device through the external connector of the water pipe connected to the copper water inlet pipe, cooling the moving coil skeleton area, and then flows from top to bottom through the external connector of the water pipe connected to the copper water outlet pipe, returning to the water-cooled cabinet.

8. The water-cooled electric vibration system suitable for explosive environments according to claim 7, characterized in that, The water cooling unit includes at least one inlet channel and one outlet channel. The external connector of the water pipe is designed as a multi-inlet pipe connector or a multi-outlet pipe connector. The copper busbar of the water pipe is used to clamp the copper inlet water pipe or the copper outlet water pipe and is fixed to the lower cover with screws.

9. The water-cooled electric vibration system suitable for explosive environments according to claim 1, characterized in that, The electrical unit includes a power amplifier, an explosion-proof gland, and a copper busbar for wire clamping. The electrical unit forms a sealed connection with the platform device through the explosion-proof gland. It adopts a connection method where a single wire corresponds to a single explosion-proof gland. The diameter of the part where the wire is crimped with the copper busbar is less than or equal to the diameter of the wire entry point in the copper busbar. The diameter of the wire entry point in the copper busbar is less than or equal to the overall outer diameter of the wire.

10. A control method for a water-cooled electric vibration system suitable for explosive environments, based on the system described in any one of claims 1 to 9, characterized in that, Including the following steps: The user sets the weight of the test piece and the test pattern, and the positive pressure system calculates the purging time T1. Before the platform device is started, the positive pressure unit is activated to deliver clean gas into the platform device and complete the internal air replacement; After the purging device starts for T1, the positive pressure system detects the pressure P of the platform. If P1≤P≤P2, the platform starts and the positive pressure system continues to run. If P<P1, the purging device continues to run. If P1 is not reached after the preset time T2, the positive pressure system alarms and the platform does not start. Here, P1 and P2 are the preset lower and upper limits of positive pressure in the platform, respectively. When the moving coil skeleton drives the specimen to move, the positive pressure system intelligently adjusts the pressure values ​​P1 and P2 according to the specimen weight, test displacement and real-time acceleration. If the internal pressure of the platform is abnormal during operation, the positive pressure unit will alarm, the platform will stop operating first, and the positive pressure unit will then stop to prevent dangerous gases and dust from entering.

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