Wet-type aluminum-magnesium dust explosion-proof grinding workbench and multi-parameter linkage monitoring system thereof

Abstract

The invention relates to the technical field of polishing tables, in particular to a wet-type aluminum magnesium dust anti-explosion polishing workbench and a multi-parameter linkage monitoring system thereof.The wet-type aluminum magnesium dust anti-explosion polishing workbench comprises a main body frame, and an operation table top is arranged on the main body frame; the dust removal and collection system comprises a front dust removal box arranged above the working table top and a table top dust removal box arranged below the working table top, and suction openings are formed in the side face of the front dust removal box, the upper surface of the table top dust removal box and the working table top; the invention discloses a water circulation filtering system and a safety explosion-proof device. According to the invention, the operation safety and the system stability are improved, the airflow distribution is optimized, and the resource waste is reduced. The overall structure is compact, maintenance is convenient, and industrial fields are suitable. According to multi-parameter cooperative monitoring, five key parameters including hydrogen, temperature, liquid level, negative pressure and dust concentration are integrated, and all-directional safety monitoring is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing tables, in particular to a wet type aluminum-magnesium dust explosion-proof polishing workbench and a multi-parameter interlocking monitoring system thereof. BACKGROUND

[0002] In the polishing process of metal workpieces such as aluminum-magnesium alloys, a large amount of combustible dust is generated, which not only pollutes the environment but also poses a serious safety hazard. Although the traditional dry dust removal system can collect some dust, it is difficult to completely remove the dust, which can easily cause dust explosion under certain conditions, seriously threatening the safety of operators and the normal operation of equipment. The existing wet dust removal equipment can reduce dust concentration and reduce explosion risk to a certain extent through water circulation filtration, but there are still obvious deficiencies in explosion-proof design, hydrogen treatment, and automatic monitoring, which are difficult to meet the safety operation requirements in the environment of flammable and explosive dust. For example, aluminum powder reacts with water to generate hydrogen, which may accumulate and increase the risk of explosion if not removed in time. In addition, the performance of existing equipment in dust collection efficiency, static electricity protection, and intelligent monitoring needs to be improved. Therefore, developing a wet type aluminum-magnesium dust explosion-proof polishing workbench with high-efficiency dust collection, reliable explosion-proof design, and intelligent monitoring function has become the key to solving the above problems. SUMMARY

[0003] The present application provides a wet type aluminum-magnesium dust explosion-proof polishing workbench and a multi-parameter interlocking monitoring system thereof to solve the problems of combustible dust accumulation, hydrogen accumulation, and insufficient automatic monitoring in the polishing process of metal workpieces in the prior art.

[0004] On the one hand, the present application provides a wet type aluminum-magnesium dust explosion-proof polishing workbench, which comprises a main structure, a dust collection system, a water circulation filtration system, a safety explosion-proof device, and an intelligent monitoring system. The main structure includes a workbench surface made of SUS201 stainless steel, which has corrosion resistance and strength and is suitable for polishing workpieces.

[0005] Further, the upper surface of the workbench surface is paved with a hole-shaped anti-static plate made of polytetrafluoroethylene (PTFE) with a thickness of 16 mm, which is soft and wear-resistant and will not damage the workpiece, while having anti-static function.

[0006] Further, the dust collection system comprises a front dust removal box and a table dust removal box. The front dust removal box is arranged above the workbench and extends along the width direction of the workbench to divide the workbench into a double-station structure symmetrically arranged. The table dust removal box is arranged below the workbench, and the internal space of the table dust removal box is in communication with the front dust removal box to form an integrated airflow channel. In particular, the two side surfaces of the front dust removal box, the upper surface of the table dust removal box and the workbench are all provided with uniformly distributed suction ports, and the suction ports are uniformly distributed by a porous structure to ensure dust capture efficiency. The suction fan is arranged at the top of the front dust removal box, and the suction pipeline of the suction fan is in communication with the inside of the front dust removal box to generate negative pressure to adsorb dust, and the air volume is 17280m³ / h (for a single polishing table) to ensure efficient dust collection effect.

[0007] Further, the water circulation and filtration system comprises the following components: a water curtain device, a sediment tank, a water pump, a water pipe and a water tank. The water curtain device is arranged in the front dust removal box to capture dust; the sediment tank is arranged at the bottom of the table dust removal box, and the sidewall of the sediment tank is in communication with the water tank; the water pump is arranged in the water tank, and the inlet of the water pump is provided with a filter screen to drive water circulation, and the flow rate is 12m 3 / h, the lift is 16m, and the power is 1.1kW; the water pipe connects the water pump and the water curtain device, and a filter is arranged on the water pipe to ensure clean water; the water tank is provided with a float valve for automatic water replenishment; and the sidewall of the water tank is provided with a sewage discharge valve for discharging sewage. In particular, the bottom of the table dust removal box is designed as a slope structure inclined towards the sediment tank to facilitate automatic sedimentation of dust.

[0008] Further, the safety explosion-proof device comprises the following components: a hydrogen discharge port, an anti-static grounding structure, a hydrogen concentration detector and an explosion-proof lamp. The hydrogen discharge port is arranged on the exhaust top beam at the top of the front dust removal box, and an exhaust fan is arranged in the hydrogen discharge port to prevent accumulation of hydrogen generated by the reaction of aluminum powder and water; the grounding resistance of the anti-static grounding structure is not greater than 4Ω to ensure reliable grounding of the table and metal parts; the hydrogen concentration detector is installed in the rear pipeline, and when the hydrogen concentration exceeds the standard, the hydrogen concentration detector automatically alarms and stops the system and lighting; and the explosion-proof lamp is arranged on the exhaust top beam, and the illuminance is ≥300Lux, which is interlocked with the hydrogen concentration detector.

[0009] Further, the control panel of the intelligent monitoring system is arranged on the front side of the front dust removal box, integrates a PLC control system and a man-machine interface, and displays equipment operation parameters in real time. The sensors include a differential pressure transmitter, a dust concentration sensor and a magnetic flap liquid level meter. The differential pressure transmitter monitors the negative pressure of the polishing table in real time, ensuring the effect of air draft; the dust concentration sensor is installed above the polishing table dust removal box, and the measurement range is 0-6000 ug / m³; the magnetic flap liquid level meter is interlocked with the water pump, and the water pump is automatically stopped when the liquid level is low. Each sensor signal is linked to an alarm system and equipment start-stop system, ensuring the safe operation of the equipment. The intelligent monitoring system realizes real-time parameter monitoring and automatic response through the interlocking control logic (such as automatic shutdown when the hydrogen concentration exceeds the standard, and air volume adjustment when the negative pressure is abnormal) of the PLC controller.

[0010] In particular, the present application realizes efficient and safe dust collection and treatment in the following ways: S1, the dust generated by polishing the workpiece on the operation table is sucked into the bottom and front air suction port; S2, the dust-containing airflow enters the water circulation system and is filtered by the water curtain; S3, the filtered clean air is discharged from the top of the equipment, and the dust falls into the sedimentation tank; S4, the suspension liquid formed by the water-washed dust enters the sedimentation tank under the action of gravity, and maintenance is completed by manual cleaning.

[0011] Further, the design features of the present application are as follows: the electrical components of the whole system meet the requirements of Class III C explosion-proof, the pipes and equipment are grounded to prevent static electricity, effectively preventing explosion risks; the double-suction design combined with the multi-hole air suction port ensures the dust capture efficiency; the water circulation filtration avoids the explosion risk of dry dust removal; the sedimentation tank is manually cleaned, the water tank liquid level is monitored and low liquid level protection is provided, and a maintenance platform is arranged at the top of the equipment for daily maintenance; the water circulation filtration system has a dust treatment efficiency of 95%, effectively reducing environmental pollution.

[0012] On the other hand, the present application also provides a multi-parameter interlocking monitoring system for the above-mentioned wet-type aluminum-magnesium dust explosion-proof polishing workbench, which comprises a monitoring unit, a control unit, an execution unit and a signal transmission unit; the monitoring unit comprises a hydrogen concentration detector, a dust concentration sensor, a temperature sensor, a differential pressure transmitter and a magnetic flap liquid level meter; the control unit is a PLC controller integrated in the control panel and connected with the monitoring unit; the execution unit comprises an air suction fan, a water pump and an explosion-proof lamp; the signal transmission unit comprises a telecommunication signal module and a data conversion module, which are used for realizing bidirectional transmission of monitoring data and control instructions.

[0013] Further, the temperature sensor is installed at the air inlet and inside the dust remover, and the monitoring range is 0-200℃; the dust concentration sensor is installed 2m above the polishing table, and the detection range is 0-6000 ug / m³; the monitoring range of the differential pressure transmitter is -1500~+1500Pa, and the negative pressure in the integrated airflow channel is monitored in real time.

[0014] Further, the PLC controller is built-in interlocking control logic, including: when the hydrogen concentration detector detects the value exceeds the set threshold, through the signal transmission unit sends instructions to the execution unit, synchronous closing the fan, water pump and explosion-proof lamps, and trigger sound light alarm; when the temperature sensor detects temperature >= 70 DEG C, cut off the fan power; when the temperature <= 55 DEG C, automatically restart the system; when the magnetic flap liquid level meter detects the water tank liquid level is lower than the set value, send the stop signal to the water pump, while starting the float ball valve automatic water replenishment; when the differential pressure transmitter monitors the negative pressure deviates from the set value ± 10%, through the frequency converter adjusts the fan air volume, maintains the stability of negative pressure.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1、The present application realizes efficient capture and directional flow of dust by the integrated design of the main frame and the workbench, the communication type airflow channel formed by the front dust removal box and the bench dust removal box, and the layout of the multi-directional air suction port, effectively solving the problem of incomplete dust collection of traditional equipment. The water curtain device in the water circulation filtration system, the hydrogen discharge port of the safety explosion-proof device, and the hydrogen concentration detector work together to filter dust through the water curtain, monitor and eliminate the risk of hydrogen accumulation in real time, and significantly improve the safety of the working environment.

[0016] 2、The present application sets an air suction fan at the top of the front dust removal box to enhance the air flow in the integrated airflow channel by using the principle of negative pressure, further improving the dust adsorption efficiency and ensuring that the dust generated during polishing quickly enters the treatment system, reducing the health hazards to the operators.

[0017] 3、The water circulation filtration system of the present application realizes automatic precipitation of dust and recycling of water through the optimized configuration of the sedimentation tank, water tank, water pump and water pipe, combined with the inclined slope structure at the bottom of the bench dust removal box. This design not only simplifies the dust cleaning process and reduces the cost of manual maintenance, but also reduces waste through the recycling of water resources, meeting the requirements of energy saving and environmental protection.

[0018] 4、The present application sets a float ball valve and a sewage valve in the water tank and installs a filter on the water pipe, realizing automatic adjustment of water level and real-time purification of water quality. The float ball valve ensures stable water volume, the filter prevents impurities from clogging the water curtain device, and the sewage valve facilitates periodic discharge of sewage, ensuring long-term stable operation of the water circulation system.

[0019] 5、The safety explosion-proof device of the present application further enhances the explosion-proof performance of the equipment through the combined design of the exhaust fan, explosion-proof lamps and anti-static grounding structure. The exhaust fan accelerates hydrogen discharge, the explosion-proof lamps automatically shut down in abnormal conditions, and the anti-static grounding structure ensures reliable grounding of the bench and metal parts, effectively avoiding the risk of static accumulation and hydrogen explosion.

[0020] 6、The intelligent monitoring system of the present application realizes real-time monitoring and automatic control of key parameters such as negative pressure, dust concentration, liquid level, etc. through the linkage of differential pressure transmitters, dust concentration sensors, magnetic flip liquid level meters and control panels. When the parameters are abnormal, the system can quickly respond and adjust the equipment operating state, improving the stability and operation convenience of the system.

[0021] 7、The present application effectively prevents damage to workpieces and operators caused by static electricity accumulation by laying anti-static plates on the workbench. The double-station structure design allows simultaneous multi-task operation, improving the efficiency of the equipment and meeting the high-efficiency operation needs in industrial production.

[0022] 8、The multi-parameter interlocking monitoring system of the present application integrates real-time monitoring functions of five parameters such as hydrogen concentration, dust concentration, temperature, negative pressure and liquid level through the cooperative work of monitoring units, control units and execution units. This system realizes all-round perception of the equipment operating state and provides data support for safe operation.

[0023] 9、The present application ensures the accuracy and reliability of parameter detection through precise monitoring range settings of temperature sensors, dust concentration sensors and differential pressure transmitters. The temperature sensor covers 0-200℃, the dust concentration sensor covers 0-6000μg / m³, and the differential pressure transmitter covers -1500~+1500Pa, fully meeting the monitoring needs of industrial polishing environment.

[0024] 10、The present application realizes rapid response and self-adaptive adjustment when parameters are abnormal through the interlocking control logic built in the PLC controller. For example, automatic shutdown and alarm when hydrogen concentration exceeds the standard, power cut-off when temperature is abnormal, automatic water replenishment when liquid level is insufficient, dynamic adjustment of air volume when negative pressure deviates, etc., significantly improving the safety redundancy and operating stability of the equipment and solving the problem of relying on manual monitoring and slow response of traditional equipment.

[0025] The present application has compact overall structure and is convenient to maintain. Through the cooperative action of multiple systems, it performs excellently in improving dust collection efficiency, ensuring operation safety and optimizing resource utilization, etc., and is suitable for wide application and promotion in industrial fields such as metal processing and mechanical manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the wet-type aluminum-magnesium dust explosion-proof polishing workbench.

[0027] Figure 2 It is a schematic diagram of the structure of one side of the wet-type aluminum-magnesium dust explosion-proof polishing workbench.

[0028] Figure 3Another side structure schematic view of the wet type aluminum magnesium dust explosion-proof polishing workbench of the present application.

[0029] Figure 4 Flow chart of the multi-parameter interlocking monitoring system of the wet type aluminum magnesium dust explosion-proof polishing workbench of the present application.

[0030] In the above figure, the component names corresponding to the reference signs are as follows: 1, main frame; 2, workbench surface; 3, anti-static plate; 4, front dust removal box; 5, bench surface dust removal box; 6, air suction port; 7, air suction fan; 8, sedimentation tank; 9, water tank; 10, water pump; 11, water pipe; 12, water curtain device; 13, hydrogen gas discharge port; 14, exhaust fan; 15, explosion-proof lamp; 16, control panel; 17, float ball valve; 18, sewage valve; 19, differential pressure transmitter; 20, dust concentration sensor; 21, magnetic flap liquid level meter; 22, exhaust top beam. DETAILED DESCRIPTION

[0031] Example 1 The present application relates to a kind of wet type aluminum magnesium dust explosion-proof polishing workbench, in combination with the drawings Figure 1 to the drawings Figure 4 As shown in the drawings, the specific embodiments will be described in detail below. The device solves the problems of combustible dust accumulation, hydrogen accumulation and insufficient automation monitoring during metal workpiece polishing process by structure design optimization, water circulation filtration system and the introduction of safety explosion-proof device, and is suitable for building materials, metallurgy, chemical industry, electric power, machinery manufacturing, casting and other industries.

[0032] The main frame 1 is the core support structure of the entire device, and the workbench surface 2 is arranged thereon. The workbench surface 2 is made of SUS201 stainless steel material, which has high corrosion resistance and strength, and can meet the needs of metal workpiece polishing operation. The upper surface of the workbench surface 2 is paved with an anti-static plate 3 with a thickness of 16mm, which is made of polytetrafluoroethylene material, soft and wear-resistant, which can not only avoid damage to the workpiece, but also effectively prevent static accumulation. The workbench surface 2 is divided into symmetrical double-station structure along the width direction by the front dust removal box 4, and each station can independently carry out polishing operation, which improves the use efficiency of the device.

[0033] The front dust removal box 4 is located above the workbench 2, and uniform suction openings 6 are formed in the two side surfaces of the front dust removal box 4, which are used to capture high-speed flying stars and dust generated in the polishing process. The table dust removal box 5 is arranged below the workbench 2, and the upper surface of the table dust removal box 5 is also provided with suction openings 6 which correspond to the suction openings on the workbench 2 one by one and are communicated with the suction openings on the workbench 2. The internal spaces of the front dust removal box 4 and the table dust removal box 5 are communicated with each other to form an integrated air flow channel. The suction fan 7 is installed on the top of the front dust removal box 4, and the suction duct of the suction fan 7 is communicated with the inside of the front dust removal box 4. The rated air volume of the suction fan 7 is 17280m³ / h, which can generate sufficient negative pressure to adsorb dust and ensure efficient dust collection effect. The table suction design can avoid the interference of the suction opening to the operation position, and at the same time, since the suction opening is closer to the dust generation point, the dust capture efficiency is higher; the front suction is used to collect the high-speed flying stars directly generated in the polishing, and the two are matched to realize the omnibearing dust capture.

[0034] The water circulation filtering system is an important part of the present application, which comprises a water curtain device 12, a sediment tank 8, a water pump 10, a water pipe 11 and a water tank 9. The water curtain device 12 is arranged in the front dust removal box 4 and is communicated with the water pump 10 through the water pipe 11. The water pump 10 is arranged in the water tank 9, and the inlet of the water pump is provided with a filter screen. The flow rate of the water pump is 12m³ / h, the lift is 16m, and the power is 1.1kW, which can drive the water circulation. The water pipe 11 is provided with a filter to ensure the water quality and avoid the blockage of the water curtain device 12 by impurities. The water tank 9 is arranged on the side wall of the sediment tank 8 and is communicated with the sediment tank 8. The water tank 9 is provided with a float ball valve 17, which can automatically supplement water when the water level decreases, so as to maintain the normal operation of the water circulation system. The bottom of the sediment tank 8 is designed as a slope structure inclined to the water tank 9, which facilitates the automatic sedimentation of dust under the action of gravity and reduces the difficulty of manual cleaning. The side wall of the water tank 9 is also provided with a sewage valve 18 for discharging sewage, so as to ensure the long-term stable operation of the water circulation system.

[0035] After the dust-containing air flow enters the air flow channel from the suction openings 6 of the front dust removal box 4 and the table dust removal box 5, it first passes through the water curtain device 12. The water flow sprayed by the water curtain device 12 forms a dense water curtain, which can effectively capture dust particles in the air flow. The captured dust falls into the sediment tank 8 with the water flow, forms a suspension and deposits at the bottom under the action of gravity. The clean air is discharged from the exhaust top beam 22 at the top of the front dust removal box 4, and the dust separation process is completed. The dust treatment efficiency of the water circulation filtering system can reach about 95%, which significantly reduces the dust concentration in the environment and avoids the explosion risk that may be caused by dry dust removal.

[0036] The design of the safety explosion-proof device further improves the safety performance of the equipment. The top of the front dust removal box 4 is provided with an exhaust top beam 22, and hydrogen exhaust ports 13 with upper and lower openings are opened at symmetrical positions left and right of the exhaust top beam 22. The hydrogen exhaust ports 13 are provided with exhaust fans 14, which can timely remove the hydrogen generated by the reaction of aluminum powder and water, and prevent the accumulation of hydrogen gas from causing explosion risk. The anti-static grounding structure penetrates through the entire equipment, ensuring that the grounding resistance of the workbench 2 and the metal components is not greater than 4Ω, effectively preventing the accumulation of static electricity. A hydrogen concentration detector is installed in the rear-end pipeline to monitor the hydrogen concentration in real time, and automatically alarms and stops the system operation and lighting when the concentration exceeds the standard. The explosion-proof lamp 15 is fixedly installed on the exhaust top beam 22, and the illuminance is ≥300Lux, which is interlocked with the hydrogen concentration detector, and automatically closes the lighting when the system detects an abnormality, further ensuring the safety of the operators.

[0037] The intelligent monitoring system realizes the automatic operation and fault alarm function of the equipment through the control panel 16. The control panel 16 is arranged on the front side of the front dust removal box 4, integrates the PLC control system and the man-machine interface, and can display the equipment operation parameters in real time. The sensor system includes a differential pressure transmitter 19, a dust concentration sensor 20 and a magnetic flip liquid level meter 21. The differential pressure transmitter 19 is installed above the bench dust removal box 5, which is used to monitor the negative pressure state of the polishing table in real time, and ensure the effect of air draft. The dust concentration sensor 20 is installed 2m above the bench dust removal box 5, and the measurement range is 0-6000ug / m³, which is used to monitor the dust concentration in the environment. The magnetic flip liquid level meter 21 is interlocked with the water pump 10, and automatically stops when the water level in the water tank 9 is lower than the set value, preventing the water pump from being damaged by idling. The signals of each sensor are linked to the alarm system and the start and stop of the equipment, ensuring that the equipment can respond in time under abnormal conditions.

[0038] The operation principle of the equipment is as follows: when the workpiece is polished on the workbench 2, the dust generated is sucked into the integrated airflow channel through the air draft ports 6 of the front dust removal box 4 and the bench dust removal box 5. When the dust-containing airflow passes through the water curtain device 12, the water curtain captures the dust, and the dust falls into the sedimentation tank 8 with the water flow under the action of gravity. The clean air is discharged from the exhaust top beam 22 at the top of the front dust removal box 4, completing the dust separation process. The float ball valve 17 in the water tank 9 automatically replenishes water according to the water level change, maintaining the normal operation of the water circulation system. The slope design at the bottom of the sedimentation tank 8 allows the dust to automatically settle, and regular manual cleaning can complete the maintenance. The hydrogen concentration detector monitors the hydrogen concentration in the rear-end pipeline in real time, and triggers an alarm and stops the system operation and lighting when the concentration exceeds the standard. The differential pressure transmitter 19 monitors the negative pressure state of the polishing table in real time, ensuring the stability of the air draft effect. The magnetic flip liquid level meter 21 monitors the water level in the water tank 9, and automatically stops when the water level is low, protecting the water pump 10 from being damaged.

[0039] The design features of the present application are that the whole system electrical components meet the Class III C explosion-proof requirements, the pipeline and equipment grounding prevent static electricity, and effectively prevent explosion risks. The double suction design combined with the porous air outlet ensures the dust capture efficiency, and the water circulation filtration system avoids the explosion risk of dry dust removal. The manual cleaning design of the sediment tank 8 is simple and easy to operate, and the liquid level monitoring and low liquid level protection function of the water tank 9 ensure the long-term stable operation of the equipment. The top of the equipment is provided with a maintenance platform for daily maintenance. The water circulation filtration system has a dust treatment efficiency of about 95%, which significantly reduces environmental pollution, and is suitable for polishing operations of flammable dust such as aluminum alloy.

[0040] As can be seen from the above specific embodiments, the wet-type aluminum-magnesium dust explosion-proof polishing workbench of the present application is optimized in terms of structure design, water circulation filtration system and safety explosion-proof device, etc., can realize efficient collection and treatment of dust, ensure operation safety, and improve use convenience. Combined with the structures and component marks shown in the accompanying drawings, Figure 1 to the accompanying drawings, Figure 3 the technical scheme of the present application is fully disclosed, and has practical application value.

[0041] In the present application, the intelligent monitoring system, control panel and water curtain spray head and other equipment are mature products on the market, which can be directly purchased and installed for use. Moreover, these devices have been widely used in various fields, and the use method is well known to those skilled in the art without any technical threshold.

[0042] The present embodiment discloses a multi-parameter interlocking monitoring system of a wet-type aluminum-magnesium dust explosion-proof polishing workbench, which is applied to the wet-type aluminum-magnesium dust explosion-proof polishing workbench shown in Figs. 1-3, and aims to realize safe explosion-proof and efficient operation of the equipment by real-time monitoring of key parameters and linkage control of the execution unit. The system includes a monitoring unit, a control unit, an execution unit and a signal transmission unit, each unit is electrically connected through a cable and a data interface, and the specific structure is as follows: The monitoring unit is used to collect key parameters of the polishing working environment and the running state of the equipment. The hydrogen concentration detector is installed in the rear-end pipeline and integrated in the safety explosion-proof device. The detection range is 0-1000 ppm, the sampling frequency is 1 time / s, and it is used to monitor the hydrogen concentration generated by the reaction of aluminum powder and water. The dust concentration sensor 20 is fixed 2 m above the table dust removal tank 5. It adopts the laser scattering principle, the detection range is 0-6000 ug / m³, the resolution is 1 ug / m³, and it is used to monitor the dust concentration in the working area in real time. The temperature sensor is embedded in the air inlet and inside of the pneumatic cyclone tower. The model is PT100, the monitoring range is 0-200℃, the accuracy is ±0.5℃, and it is used to detect the abnormal air temperature. The differential pressure transmitter 19 is connected through the flange at the integrated air flow channel, that is, the communication place of the front dust removal tank 4 and the table dust removal tank 5. The range is -1500-+1500 Pa, the output is 4-20 mA current signal, and it is used to monitor the negative pressure stability in the channel. The magnetic flap liquid level meter 21 is vertically installed on the side wall of the water tank 9. The measurement range is 0-1.5 m, it is linked with the water level in the water tank 9, and it feeds back the liquid level height in real time.

[0043] The control unit is a PLC controller integrated in the control panel 16. The model is Siemens S7-1200, which is configured with 16 digital input / output modules and 4 analog input modules. The PLC controller receives real-time data from the monitoring unit through the signal transmission unit, and outputs instructions to the execution unit according to the built-in preset control logic. The control panel 16 is embedded on the front side of the front dust removal tank 4, equipped with a 7-inch touch screen, and displays the parameter curves and equipment running state in real time.

[0044] The execution unit receives instructions from the control unit and performs corresponding actions. The suction fan 7 is a T4-72 model with a power of 55kW. It is connected to the PLC controller through a frequency converter, and can adjust the air volume range to 45000-81000 m³ / h. The water pump 10 has a flow of 12 m³ / h and a lift of 16 m. It is interlocked with the magnetic flap liquid level meter 21 and automatically stops when the liquid level is low. The explosion-proof lamp 15 is installed on the exhaust top beam 22, with an illumination of ≥300 Lux, and is linked with the hydrogen concentration detector to control the switch. The audible and visual alarm is installed on the top of the control panel 16, which adopts a red LED light + buzzer, with a sound pressure level of ≥85 dB, and sends out audible and visual warnings when triggered.

[0045] The signal transmission unit realizes bidirectional data transmission. The shielded twisted pair line is used to transmit analog signals such as differential pressure transmitter and liquid level meter signals. The transmission distance is ≤100 m, and the anti-interference ability is strong. The data conversion module converts the 4-20 mA current signal output by the sensor into a digital signal, adopts the Modbus protocol, and transmits it to the PLC controller.

[0046] Example 2 This embodiment describes the interlocking control logic of the PLC controller. When the hydrogen concentration detector detects a value ≥ 1000 ppm, that is, reaches the set threshold, the PLC controller immediately sends a command to shut off the power of the suction fan 7 and the water pump 10, turn off the explosion-proof lamp 15, and at the same time start the audible and visual alarm, which continues to alarm until the concentration drops to a safe value, i.e. ≤ 500 ppm.

[0047] In terms of temperature anomaly control, when the temperature sensor detects a temperature ≥ 70°C, the PLC controller shuts off the power of the suction fan 7 and closes the water pump 10 after a delay of 30 seconds; when the temperature ≤ 55°C and lasts for 5 minutes, the suction fan 7 and the water pump 10 are automatically restarted.

[0048] For liquid level and water replenishment control, when the magnetic reed liquid level meter 21 detects that the water tank 9 liquid level ≤ 0.3m, i.e. the low liquid level threshold, the PLC controller sends a shutdown signal to the water pump 10 to prevent idling, while synchronously opening the float ball valve 17, automatically replenishing water to a liquid level ≥ 1.2m, i.e. the high liquid level threshold, then closing the float ball valve 17 and restarting the water pump 10.

[0049] Regarding negative pressure stability control, the differential pressure transmitter 19 monitors the negative pressure value in real time, with a set reference value of -800Pa. When the negative pressure deviates from the reference value by ±10%, i.e. ≤-720Pa or ≥-880Pa, the PLC controller adjusts the speed of the suction fan 7 through the frequency converter to dynamically correct the air volume; if it still does not recover to the reference value ±5% range within 30 seconds after adjustment, the audible and visual alarm is triggered and the message "check pipeline tightness" is prompted.

[0050] Example 3 This embodiment introduces the system collaborative workflow. In the start-up phase, after the equipment is powered on, the PLC controller initializes each sensor. After self-checking, the suction fan 7 starts at 50% air volume. After the differential pressure transmitter 19 monitors the negative pressure to reach -800Pa±5%, the water pump 10 starts, the water circulation system begins to run, the explosion-proof lamp 15 lights up, and the dust concentration sensor 20 enters the real-time monitoring state.

[0051] In the running phase, the monitoring unit collects data every 1 second, which is sent to the PLC controller through the signal transmission unit. The PLC controller judges in real time according to the preset logic. If all parameters are normal, the equipment is maintained in operation; if any abnormal condition is triggered, the corresponding interlocking control action is immediately executed, as described in Example 2.

[0052] In the shutdown stage, after the "stop" button of the control panel 16 is pressed manually, the air suction fan 7 gradually reduces the air volume to 20%, and stops completely after 30 seconds, ensuring that the residual dust in the pipeline is completely removed, the water pump 10 stops after a delay of 1 minute, the water curtain device 12 is drained of residual water, all sensors remain powered for 5 minutes, the data before shutdown is recorded and stored in the PLC controller memory.

[0053] The application has the advantages that the multi-parameter cooperative monitoring integrates five key parameters of hydrogen, temperature, liquid level, negative pressure and dust concentration, realizes omnibearing safety monitoring, the response time of the PLC controller and the execution unit is ≤100 ms through fast response control, ensuring that the equipment is stopped immediately in abnormal conditions, the frequency converter dynamically adjusts the air volume through self-adaptive adjustment, maintains stable negative pressure, reduces energy consumption while ensuring dust removal efficiency, and the control panel displays fault codes such as "E01 - hydrogen exceeds the standard" and "E02 - low liquid level" in real time, facilitating quick positioning of problems.

[0054] The above examples do not limit the application in any form, and any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent examples with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the application. Any simple modification, equivalent change and modification of the above examples made according to the technical essence of the application still belong to the scope of the technical solution of the application.

Claims

1. A wet aluminum-magnesium dust explosion-proof grinding workbench, characterized in that, include: The main frame (1) is provided with a work surface (2). The dust collection system includes a front dust collection box (4) located above the work surface (2) and a table dust collection box (5) located below the work surface (2). The internal spaces of the front dust collection box (4) and the table dust collection box (5) are interconnected to form an integrated airflow channel. The side of the front dust collection box (4), the upper surface of the table dust collection box (5) and the work surface are all provided with exhaust vents (6). The water circulation filtration system includes a water curtain device (12) located in the integrated airflow channel inside the front dust collector (4). The safety explosion-proof device includes an exhaust top beam (22) located on the top of the front dust collector (4), a hydrogen exhaust port (13) located on the exhaust top beam (22) and extending vertically, and a hydrogen concentration detector that is linked and controlled with the hydrogen exhaust port (13).

2. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 1, characterized in that, The dust collection system also includes a suction fan (7), which is located on the top of the exhaust top beam (22). The suction pipe of the suction fan (7) is connected to the interior of the front dust collection box (4) to generate negative pressure in the integrated airflow channel.

3. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 1, characterized in that, The water circulation filtration system also includes: A sedimentation tank (8) is located at the bottom of the tabletop dust collection box (5); A water tank (9) is located on the side wall of the sedimentation tank (8) and is connected to it; A water pump (10) is installed inside the water tank (9), and a filter screen is provided at the inlet of the water pump (10); Water pipe (11) connects the water pump (10) and the water curtain device (12); The bottom of the tabletop dust collection box (5) is designed with a slope structure that is inclined toward the sedimentation tank (8).

4. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 3, characterized in that, The water tank (9) is equipped with a float valve (17) for automatic water replenishment, and a drain valve (18) for discharging sewage is provided on the side wall of the water tank (9); a filter is provided on the water pipe (11).

5. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 1, characterized in that, The safety and explosion-proof device also includes: An exhaust fan (14) is built into the hydrogen exhaust port (13); An explosion-proof light fixture (15) is installed on the top of the front dust collection box (4) and is interlocked with the hydrogen concentration detector. An anti-static grounding structure is provided, which connects the metal parts of the workbench (2) and the main frame (1) and ensures that they are grounded. The grounding resistance of the anti-static grounding structure is not greater than 4Ω.

6. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 3, characterized in that, It also includes an intelligent monitoring system, which comprises: Control panel (16) is located on the front side of the front dust collection box (4); A differential pressure transmitter (19) is used to monitor the negative pressure in the integrated airflow channel; A dust concentration sensor (20) is used to monitor the ambient dust concentration around the workbench; A magnetic level gauge (21) is installed on the water tank (9) and is interlocked with the water pump (10); The signals from the differential pressure transmitter (19), the dust concentration sensor (20), and the magnetic level gauge (21) are all connected to the control panel (16).

7. The wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 1, characterized in that, The upper surface of the workbench (2) is covered with an antistatic board (3); the front dust removal box (4) extends along the width direction of the workbench (2) and divides the workbench (2) into a symmetrically arranged dual-station structure.

8. A multi-parameter interlocking monitoring system for a wet aluminum-magnesium dust explosion-proof grinding workbench as described in any one of claims 1-6, characterized in that, It includes a monitoring unit, a control unit, an execution unit, and a signal transmission unit; the monitoring unit includes a hydrogen concentration detector, a dust concentration sensor (20), a temperature sensor, a differential pressure transmitter (19), and a magnetic level gauge (21); the control unit is a PLC controller, integrated into the control panel (16) and connected to the monitoring unit via signal; the execution unit includes a fan (7), a water pump (10), and an explosion-proof lamp (15); the signal transmission unit includes an electrical signal module and a data conversion module, used to realize bidirectional transmission of monitoring data and control commands.

9. The multi-parameter interlocking monitoring system for the wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 8, characterized in that, The temperature sensor is installed at the air inlet and inside of the dust collector, with a monitoring range of 0-200℃; the dust concentration sensor (20) is installed 2m above the grinding table, with a detection range of 0-6000ug / m³; the differential pressure transmitter (19) has a monitoring range of -1500~+1500Pa, and monitors the negative pressure in the integrated airflow channel in real time.

10. The multi-parameter interlocking monitoring system for the wet aluminum-magnesium dust explosion-proof grinding workbench according to claim 8, characterized in that, The PLC controller has built-in interlocking control logic, including: When the hydrogen concentration detector detects a value exceeding the set threshold, it sends a command to the execution unit through the signal transmission unit to simultaneously shut down the suction fan (7), water pump (10) and explosion-proof lamps (15), and triggers an audible and visual alarm. When the temperature sensor detects a temperature ≥70℃, the power supply to the suction fan (7) is cut off; when the temperature ≤55℃, the system is automatically restarted. When the magnetic level gauge (21) detects that the water level in the water tank (9) is lower than the set value, it sends a stop signal to the water pump (10) and simultaneously starts the float valve (17) to automatically replenish water; When the differential pressure transmitter (19) detects that the negative pressure deviates from the set value by ±10%, the air volume of the suction fan (7) is adjusted by the frequency converter to maintain the stability of the negative pressure.

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