CN111705317A - Supersonic laser deposition powder collection device with safety monitoring - Google Patents
Supersonic laser deposition powder collection device with safety monitoring Download PDFInfo
- Publication number
- CN111705317A CN111705317A CN202010594587.9A CN202010594587A CN111705317A CN 111705317 A CN111705317 A CN 111705317A CN 202010594587 A CN202010594587 A CN 202010594587A CN 111705317 A CN111705317 A CN 111705317A
- Authority
- CN
- China
- Prior art keywords
- aramid fiber
- fiber cloth
- powder
- workbench
- exhaust fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Laser Beam Processing (AREA)
Abstract
A supersonic laser deposition powder collecting device with safety monitoring comprises a powder feeder, a laser, a nozzle and a power supply, wherein the nozzle is arranged in a through hole of a metal shielding plate, a workbench is arranged below the metal shielding plate, the nozzle is aligned to a base material on the workbench, and a powder collecting box is arranged below the workbench; the upper end of the outer aramid fiber cloth is enclosed outside the metal shielding plate, the lower end of the outer aramid fiber cloth is connected with the outer side wall of the powder collecting box, the upper end of the inner aramid fiber cloth is connected with the outer side of the workbench, and the lower end of the outer aramid fiber cloth is connected with the inner side wall of the powder collecting box; the metal shielding plate, the workbench, the outer aramid fiber cloth, the inner aramid fiber cloth and the powder collecting box enclose a closed space; the exhaust fan is arranged in the sealed space, the filter screen is arranged at the air inlet of the exhaust fan, and the side wall of the air inlet of the exhaust fan is hermetically connected with the aramid fiber cloth at the outer side. The invention has the beneficial effects that: automatically collecting the powder sprayed into the air; preventing dust explosion.
Description
Technical Field
The invention belongs to the field of supersonic laser deposition, and particularly relates to a supersonic laser deposition powder collecting device with safety monitoring.
Background
The Supersonic Laser Deposition (SLD) technique is a new laser composite fabrication technique that has been developed in recent years. In this technique, the high pressure gas stream (compressed air or nitrogen) is split into two paths: one path of the gas-solid two-phase flow enters a mixing cavity by carrying spraying particles through a powder feeder, and the other path of the gas-solid two-phase flow is preheated by a gas heater and then is fully mixed with the gas flow carrying the spraying particles in the mixing cavity to form a gas-solid two-phase flow. The mixed gas-solid two-phase flow enters a Laval nozzle to be accelerated, and the sprayed particles impact the surface of the substrate synchronously heated by the laser at supersonic speed to form a deposition layer. The laser head and the normal line of the surface of the matrix form a certain angle or are coaxially arranged with the nozzle, the Laval nozzle is perpendicular to the surface of the matrix, and the laser beam and the spraying powder are partially overlapped, so that the laser can heat the surface area of the matrix, can preheat the spraying powder and can soften the matrix and the spraying powder. The powder particles and the high-pressure gas reach supersonic speed in the process of supersonic laser deposition, and the method has extremely high danger to human bodies. The deposition temperature of the spraying area can be monitored in real time through an infrared high temperature instrument, the output power of laser can be adjusted in real time through a closed loop feedback system, and the deposition temperature in the deposition layer preparation process is guaranteed to be constant.
Most of the existing supersonic laser deposition technology is carried out in a special spraying room, a special powder collecting device is not arranged, a door can be closed in the deposition process, and when the deposition experiment is finished, personnel enter the room to clean the room. Although the safety is improved, this approach has several disadvantages:
1. the sprayed powder particles are extremely fast, and the undeposited powder particles can be reflected after colliding with the matrix, so that the whole spraying room is powder, which is not beneficial to cleaning, and moreover, the sprayed particles are very small, possibly suspended in the air and cause injury after being inhaled by people.
2. A lot of dust on the ground is mixed in the cleaned powder particles, so that the powder particles cannot be reused, the powder is expensive, resources are wasted, and the processing cost is increased.
3. The existing supersonic laser deposition room is not provided with a dust concentration real-time monitoring device, and is not provided with alarm and emergency stop settings for powder concentration, when spraying powder contains explosive metals such as Mg, Al and the like, and the powder concentration and the temperature reach certain values, dust explosion can be caused.
4. The existing supersonic laser deposition room has no automatic emergency stop function when the abnormal condition is detected, and the danger can not be stopped in time.
Aramid fiber is a novel high-tech synthetic fiber, has super high strength, high modulus and high temperature resistance, acid and alkali resistance, light weight and other excellent properties, and its intensity is 5 ~ 6 times of steel wire, and the modulus is 2 ~ 3 times of steel wire or glass fiber, and toughness is 2 times of steel wire, and weight is only about 1/5 of steel wire, under 560 degrees of temperature, does not decompose, does not melt. The insulating material has good insulativity and ageing resistance, long life cycle and good high-temperature resistance. The continuous use temperature range of the aramid fiber 1414 is extremely wide, and the aramid fiber 1414 can normally operate for a long time within the range of-196 ℃ to 204 ℃. The shrinkage rate of the composite steel wire is 0 at 150 ℃, the composite steel wire does not decompose or melt at the high temperature of 560 ℃, and the composite steel wire has good insulation and corrosion resistance and long life cycle, thereby gaining the reputation of 'synthetic steel wire'. The aramid fiber 1414 is first applied to the advanced fields of national defense, military industry and the like. Aramid 1414 is used in large quantities in body armor, bulletproof helmets, stab and cut resistant armor, blast resistant armor, high strength parachutes, bullet proof bodies, armor panels, and the like. In the body armor, the aramid fiber has high strength and good toughness and knitting performance, so that the energy of bullet impact can be absorbed and dispersed and transferred to other fibers of the knitted fabric, and blunt injury is avoided, so that the protective effect is remarkable. The light weight of the aramid bulletproof clothes and helmets effectively improves the quick response capability and the protection capability of the army.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a supersonic laser deposition powder collecting device with safety monitoring, which can reduce cleaning workload, improve production efficiency, recycle powder, reduce production cost, prevent dust from flying to damage human bodies, monitor dust concentration and light spot temperature in real time, prevent explosion accidents, and take measures to stop the machine in time so as to prevent accidents.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a supersonic speed laser deposition powder collection device with safety monitoring which characterized in that: including powder feeder and laser instrument, nozzle and power, its characterized in that: the nozzle is arranged in the through hole of the metal shielding plate, a workbench is arranged below the metal shielding plate, the nozzle is aligned to a base material on the workbench, and a powder collecting box is arranged below the workbench; the upper end of the outer aramid fiber cloth is enclosed on the outer side of the metal shielding plate, the lower end of the outer aramid fiber cloth is connected with the outer side wall of the powder collecting box, the upper end of the inner aramid fiber cloth is connected with the outer side of the workbench, and the lower end of the outer aramid fiber cloth is connected with the inner side wall of the powder collecting box; the metal shielding plate, the workbench, the outer aramid fiber cloth, the inner aramid fiber cloth and the powder collecting box enclose a closed space; an air inlet of the exhaust fan penetrates through the aramid fiber cloth on the outer side and is arranged in the sealed space, a filter screen is arranged at the air inlet of the exhaust fan, and the side wall of the air inlet of the exhaust fan is hermetically connected with the aramid fiber cloth on the outer side; an infrared thermometer and a powder concentration sensor are arranged on the workbench, and the infrared thermometer is aligned to the substrate; the infrared thermometer and the powder concentration sensor are both connected with the controller through data lines; the control ends of the powder feeder, the laser, the nozzle and the exhaust fan are all connected with the instruction output end of the controller.
The exhaust fan comprises a first exhaust fan and a second exhaust fan which are arranged along the radial direction of the outer aramid fiber cloth.
The two metal shielding plates of the metal shielding plate are inserted through the grooves and fastened through bolts, and the metal shielding plates are made of light high-strength hard materials.
All aramid fiber cloth is made of aramid fibers, a filter layer made of superfine synthetic fibers is distributed on the outer side face of the aramid fiber cloth and made of nylon fibers, and the aramid fiber cloth and the filter layer are combined to form a good ventilation effect and a good powder particle shielding effect.
The powder collecting box is fixed on the ground during operation, and jump is caused when spraying air pressure is too large for preventing.
The connection mode of the outer side aramid fiber cloth, the inner side aramid fiber cloth and other parts adopts a fastening tape and a fastening bolt.
The working temperature and working environment of the used infrared thermometer and the powder concentration sensor can adapt to the working environment, the installation position of the powder concentration sensor is calculated and reasonably arranged to ensure that the powder concentration sensor is not reflected by laser and then irradiates and is far away from a spraying area, and the whole control system adopts closed-loop control.
The installation position of the powder concentration sensor ensures that the powder concentration sensor is not irradiated after being reflected by laser and is far away from a spraying area.
The aramid fiber cloth is made of aramid fibers 1414.
The exhaust fan is closely connected with the connection part of the aramid fiber cloth.
In the supersonic laser deposition process, the powder and the laser beam collide with the base material and then are reflected into the air, a large part of kinetic energy is lost when the reflected powder and the laser beam collide with the top metal baffle plate and the surrounding aramid fiber cloth, the powder slowly falls down and is deposited in a powder collecting box, and symmetrically distributed exhaust fans are arranged for accelerating the falling of powder particles; when explosive metal powder such as (Mg, Ti, Al) is contained in the spray powder particles, the powder particles reach a certain concentration and may explode when subjected to high temperature. Therefore, be equipped with infrared thermometer real-time supervision temperature in powder and laser beam department, install powder concentration sensor real-time supervision powder concentration simultaneously on the workstation, when dust concentration and facula temperature all reach the safety threshold who sets up, the controller can receive this signal and send control signal instruction and give powder feeder and laser instrument and nozzle device and warning light, powder feeder and laser instrument and nozzle device all stop the operation this moment, the warning light scintillation simultaneously and pipe, control system closed-loop control, thereby reach the mesh that prevents the dust explosion, guarantee life and property safety.
The invention has the beneficial effects that: the powder sprayed into the air can be automatically collected; the purpose of preventing dust explosion.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
The following describes a detailed embodiment of the present invention with reference to the accompanying drawings.
Embodiment 1 the invention relates to a supersonic laser deposition powder collecting device with safety monitoring, which comprises a powder feeder, a laser, a nozzle 5 and a power supply 1, wherein the nozzle 5 is arranged in a through hole of a metal shielding plate 3, a workbench 20 is arranged below the metal shielding plate 3, the nozzle 5 is aligned to a base material 12 on the workbench 20, and a powder collecting box 17 is arranged below the workbench 20; the upper end of the outer aramid fiber cloth 9 is enclosed outside the metal shielding plate 3, the lower end of the outer aramid fiber cloth 9 is connected with the outer side wall of the powder collecting box 17, the upper end of the inner aramid fiber cloth 18 is connected with the outer side of the workbench 20, and the lower end of the outer aramid fiber cloth 18 is connected with the inner side wall of the powder collecting box 17; the metal shielding plate 3, the workbench 20, the outer aramid fiber cloth 9, the inner aramid fiber cloth 18 and the powder collecting box 17 enclose a closed space; an air inlet of the exhaust fan penetrates through the aramid fiber cloth 9 on the outer side and is arranged in the sealed space, a filter screen 14 is arranged at the air inlet of the exhaust fan, and the side wall of the air inlet of the exhaust fan is hermetically connected with the aramid fiber cloth 9 on the outer side; an infrared thermometer 10 and a powder concentration sensor 21 are arranged on the workbench, and the infrared thermometer 10 is aligned to the base material 12; the infrared thermometer 10 and the powder concentration sensor 21 are both connected with the controller 2 through data lines; the control ends of the powder feeder, the laser, the nozzle 5 and the exhaust fan are all connected with the instruction output end of the controller 2.
The exhaust fan comprises a first exhaust fan 15 and a second exhaust fan 22 which are arranged along the radial direction of the outer aramid fiber cloth 9.
The two metal shielding plates of the metal shielding plate 3 are inserted through the groove 6 and fastened through the bolt 7. And the metal baffle plates are made of light high-strength hard materials.
All aramid fiber cloth is made of aramid fibers 1414, a filter layer made of superfine synthetic fibers is distributed on the outer side face of the aramid fiber cloth and made of nylon fibers, and the aramid fiber cloth and the filter layer are combined to form a good ventilation effect and a good powder particle shielding effect.
The powder collecting box 17 is fixed on the ground during operation, and is used for preventing the powder collecting box from jumping caused by overlarge spraying air pressure.
The connection mode of the outer side aramid fiber cloth 9 and the inner side aramid fiber cloth 18 with other parts adopts a magic tape 19 and fastening bolts.
The working temperature and working environment of the used infrared thermometer 10 and the powder concentration sensor 21 can adapt to the working environment, the installation position of the powder concentration sensor 21 is calculated and reasonably arranged to ensure that the powder concentration sensor is not reflected by laser and then irradiates and is far away from a spraying area, and the whole control system adopts closed-loop control.
The installation position of the powder concentration sensor ensures that the powder concentration sensor is not irradiated after being reflected by laser and is far away from a spraying area.
The exhaust fan is closely connected with the connection part of the aramid fiber cloth.
Example 2:
as shown in fig. 1, the supersonic laser deposition powder collecting device comprises a metal shielding plate 3, a powder collecting box 17, a workbench 20, outer aramid fiber cloth 9, inner aramid fiber cloth 18, a nozzle outer side metal shielding plate mounting groove 4, bolts 7, metal shielding plate and aramid fiber cloth connecting bolts 8, aramid fiber cloth and workbench connecting bolts 13, aramid fiber cloth and powder collecting box connecting bolts 16, a hook-and-loop fastener 19, a first exhaust fan 15, a second exhaust fan 22, an infrared thermometer 10, a powder concentration sensor 21, a controller 2, a power supply 1 and an alarm lamp 23. The metal shielding plate 3 is divided into two parts, the edges of the metal shielding plate are provided with grooves 6 which can be clamped into the metal shielding plate mounting grooves 4 on the outer side of the nozzle and are fixedly connected through bolts 7, so that the nozzle is centered, the outer side aramid fiber cloth 9 surrounds the outer edge of the metal shielding plate and the powder collecting box 17 and is fixedly connected with the aramid fiber cloth connecting bolts 8 and the aramid fiber cloth and the powder collecting box connecting bolts 16 through the metal shielding plate and the aramid fiber cloth respectively; fix, simultaneously for guaranteeing good collection effect, collect between box 17 at workstation 20 and powder and form the shielding face through inboard aramid fiber cloth 18, and be in the same place through aramid fiber cloth and workstation connecting bolt 13 interconnect between the two. An infrared thermometer 10 is arranged outside the nozzle 5 to monitor the spot temperature of the powder and the laser beam 11 in real time, a powder concentration sensor 21 is arranged on the workbench 20, and all control signals are sent out by the controller 2. A first exhaust fan 15 and a second exhaust fan 22 are arranged on two sides of the workbench, and a filter screen 14 is arranged at the opening of the exhaust fans. Thereby greatly reducing the cleaning workload and the working difficulty of the spraying room and simultaneously protecting the bodies of workers from being damaged by the powder particles. The metal shielding plate 3, the outer side aramid fiber cloth 9, the inner side aramid fiber cloth 18, the powder collecting box 17 and the powder concentration sensor 21 are all detachable.
When the powder and the laser beam 11 sprayed from the nozzle 5 contain explosive metal powder such as (Mg, Ti, Al) and the like, the powder and the laser beam 11 collide with the base material 12 and then are reflected into the air, a large part of kinetic energy is lost when the reflected powder collides with the top metal shielding plate 3 and the surrounding outer aramid fiber cloth 9, the particle powder slowly falls down and is deposited in the powder collecting box 17, and the first exhaust fan 15 and the second exhaust fan 22 which are symmetrically distributed are arranged for accelerating the falling of the powder particles. Meanwhile, the infrared thermometer 10 is arranged at the powder and laser beam to monitor the temperature in real time, the powder concentration sensor 21 is arranged on the workbench 20 to monitor the powder concentration in real time, when the dust concentration and the light spot temperature reach the set safety threshold value, the controller 2 receives the signal and sends a control signal instruction to the powder feeder, the laser, the nozzle 5 and the alarm lamp 23, the powder feeder, the laser and the nozzle 5 stop operating at the moment, the alarm lamp 23 flickers and sounds to send a signal, the control system performs closed-loop control, the purpose of preventing dust explosion is achieved, and the life and property safety is guaranteed. After one-time experiment work, the parts are sequentially disassembled from top to bottom, the workbench is cleaned, collected powder particles are stored for next use, all aramid fiber cloth can be cleaned after being used for a period of time, and each monitoring device is also timely maintained and checked.
It should be emphasized that the above-described embodiments are merely preferred embodiments of the invention, rather than limitations of the invention in any way, and all simple modifications, equivalent variations and modifications to the above-described embodiments, which are consistent with the technical spirit of the invention, are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a supersonic speed laser deposit powder collection device with safety monitoring, includes powder feeder and laser instrument, nozzle and power, its characterized in that: the nozzle is arranged in the through hole of the metal shielding plate, a workbench is arranged below the metal shielding plate, the nozzle is aligned to a base material on the workbench, and a powder collecting box is arranged below the workbench; the upper end of the outer aramid fiber cloth is enclosed on the outer side of the metal shielding plate, the lower end of the outer aramid fiber cloth is connected with the outer side wall of the powder collecting box, the upper end of the inner aramid fiber cloth is connected with the outer side of the workbench, and the lower end of the outer aramid fiber cloth is connected with the inner side wall of the powder collecting box; the metal shielding plate, the workbench, the outer aramid fiber cloth, the inner aramid fiber cloth and the powder collecting box enclose a closed space; an air inlet of the exhaust fan penetrates through the aramid fiber cloth on the outer side and is arranged in the sealed space, a filter screen is arranged at the air inlet of the exhaust fan, and the side wall of the air inlet of the exhaust fan is hermetically connected with the aramid fiber cloth on the outer side; an infrared thermometer and a powder concentration sensor are arranged on the workbench, and the infrared thermometer is aligned to the substrate; the infrared thermometer and the powder concentration sensor are both connected with the controller through data lines; the control ends of the powder feeder, the laser, the nozzle and the exhaust fan are all connected with the instruction output end of the controller.
2. The supersonic laser deposited powder collection apparatus with safety monitoring of claim 1, wherein: the exhaust fan comprises a first exhaust fan and a second exhaust fan which are arranged along the radial direction of the outer aramid fiber cloth.
3. The supersonic laser deposited powder collection device with safety monitoring of claim 1, wherein: the two metal shielding plates of the metal shielding plate are inserted through the grooves and fastened through bolts.
4. The supersonic laser deposited powder collection device with safety monitoring of claim 1, wherein: all aramid fiber cloth is made of aramid fibers, a filter layer made of superfine synthetic fibers is distributed on the outer side face of the aramid fiber cloth and made of nylon fibers, and the aramid fiber cloth and the filter layer are combined to form a good ventilation effect and a good powder particle shielding effect.
5. The supersonic laser deposited powder collection device with safety monitoring of claim 1, wherein: the powder collecting box is fixed on the ground during operation.
6. The supersonic laser deposited powder collection device with safety monitoring of claim 1, wherein: the connection mode of the outer side aramid fiber cloth, the inner side aramid fiber cloth and other parts adopts a fastening tape and a fastening bolt.
7. The supersonic laser deposition powder collection device with safety monitoring of claim 1, wherein: the working temperature and working environment of the used infrared thermometer and the powder concentration sensor can adapt to the working environment, the installation position of the powder concentration sensor is calculated and reasonably arranged to ensure that the powder concentration sensor is not reflected by laser and then irradiates and is far away from a spraying area, and the whole control system adopts closed-loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010594587.9A CN111705317A (en) | 2020-06-28 | 2020-06-28 | Supersonic laser deposition powder collection device with safety monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010594587.9A CN111705317A (en) | 2020-06-28 | 2020-06-28 | Supersonic laser deposition powder collection device with safety monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111705317A true CN111705317A (en) | 2020-09-25 |
Family
ID=72542872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010594587.9A Pending CN111705317A (en) | 2020-06-28 | 2020-06-28 | Supersonic laser deposition powder collection device with safety monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111705317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747789A (en) * | 2022-11-07 | 2023-03-07 | 南京航空航天大学 | Preparation device and method of anti-cracking laser cladding coating |
-
2020
- 2020-06-28 CN CN202010594587.9A patent/CN111705317A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747789A (en) * | 2022-11-07 | 2023-03-07 | 南京航空航天大学 | Preparation device and method of anti-cracking laser cladding coating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111705317A (en) | Supersonic laser deposition powder collection device with safety monitoring | |
| CN106356737B (en) | A kind of shatter-proof fire-retardant free-standing low temperature power distribution cabinet | |
| CN109410505A (en) | A kind of fire alarm prompt prevention fire extinguishing system | |
| CN212894975U (en) | Supersonic laser deposition powder collection device with safety monitoring | |
| CN110038237A (en) | Hot-fluid baffling device is used under battle conditions in scene of fire | |
| CN106390345A (en) | Safe and efficient dedusting, cooling and fire extinguishing multifunctional system | |
| CN206027322U (en) | Online monitored control system of air force dust remover dust | |
| CN206180821U (en) | Novel explosion -proof frequency converter switch board | |
| CN111068222A (en) | Five-axis motion automatic aiming fire extinguishing agent protection system and working method thereof | |
| CN209373752U (en) | A kind of fire alarm prompt prevention fire extinguishing system | |
| CN2241002Y (en) | Automatic alarm extinguishing device for cable fire | |
| CN207248850U (en) | Mining ventilation detecting system | |
| CN106953250B (en) | A kind of electrical cabinet automatic control system | |
| CN203812055U (en) | Track inspection robot system | |
| CN110507926A (en) | The dedicated fine spray extinguisher of wind-driven generator | |
| Gandhi et al. | Potential health hazards from burning aircraft composites | |
| CN101214409A (en) | Fire-fighting vehicle-mounted vortex jetting fire extinguisher | |
| CN108144241B (en) | Device and method for preventing rainbow running powder explosion | |
| CN207384652U (en) | A kind of explosion venting device with venting of dust explosion piece | |
| CN108945064A (en) | A kind of chemical plant fire-fighting trammer dedicated | |
| CN207002883U (en) | A kind of high-efficiency carbon fibre low temperature carbonization furnace waste discharge pipe-line system | |
| CN113616953A (en) | Unmanned aerial vehicle direct-spraying water-based fire extinguishing device | |
| CN209711655U (en) | A kind of modular safety cap | |
| CN113071160A (en) | Molten metal drop splashing protective clothing and processing method thereof | |
| CN217253551U (en) | Cloud platform monitoring device for plasma steel plate cutting machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |