An automatic tracking and positioning jet fire extinguishing device with intelligent IoT function

By introducing a vibration-damping adjustment mechanism and a fuse replacement device into the jet fire extinguishing device, the problems of spray dead angle and recoil are solved, thereby reducing the fire extinguishing blind zone and extending the service life.

CN116392751BActive Publication Date: 2025-01-14HYDROPOWER FIRE TECH CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202310503155.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-06
Publication Date
2025-01-14
Estimated Expiration
2043-05-06

AI Technical Summary

Technical Problem

Jet fire extinguishing devices suffer from problems such as blind spots during spraying and damage to electronic components due to recoil, which affects their service life.

Method used

By employing a vibration-absorbing adjustment mechanism and a fusion replacement device, the angle between the first and second barrels is adjusted and the rubber bands are fused and replaced to reduce the fire extinguishing blind zone and absorb vibration force, thus protecting the main body of the jet fire extinguishing device.

Benefits of technology

It effectively reduces blind spots in fire suppression, extends the service life of jet fire suppression devices, protects electronic components, and improves the stability and reliability of the device.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116392751B_ABST
    Figure CN116392751B_ABST
Patent Text Reader

Abstract

The present invention relates to the field of fire fighting technology, and proposes an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things functions, which can monitor electronic components, voltage, and fire alarm status, and can automatically extinguish fires, manually control fire extinguishing, and remotely control. The device comprises a jet fire extinguishing device body, and a gun barrel arranged on the jet fire extinguishing device body. The gun barrel comprises a first gun barrel for water intake and a second gun barrel for water discharge. The first gun barrel is arranged on the jet fire extinguishing device body. A vibration absorbing adjustment mechanism is arranged between the first gun barrel and the second gun barrel, which is used to absorb the vibration force generated by the water discharge of the gun barrel before the gun barrel encounters a dead angle for fire extinguishing, and to adjust the angle between the first gun barrel and the second gun barrel when the gun barrel encounters a dead angle for fire extinguishing to reduce the blind area for fire extinguishing.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present invention relates to the field of fire fighting technology, and in particular to an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function. Background Art

[0002] The jet fire extinguishing device is controlled by the intelligent IoT system and can automatically extinguish fires accurately. It can extinguish the fire source in the early stage of the fire and is a good tool for controlling the fire. However, the jet fire extinguishing device also has two shortcomings during use. First, Figure 1 As shown, the jet fire extinguishing device is installed on the top surface of the wall through a flange. The body 1 of the jet fire extinguishing device can rotate horizontally relative to the flange, and the barrel 2 of the jet fire extinguishing device can swing up and down within a certain range. Under the control of the intelligent Internet of Things system, the fire situation can be quickly discovered, the location of the fire source can be locked, and the fire source can be extinguished. However, the jet fire extinguishing device also has a blind spot that cannot be sprayed. When the fire source is close to the body of the jet fire extinguishing device, there is a rotation dead angle between the barrel and the fire source so that the water flow cannot act on the fire source. Second, the water flow ejected from the barrel of the jet fire extinguishing device has a high pressure. Although it can improve the fire extinguishing efficiency, the recoil caused by the water flow also affects the body of the jet fire extinguishing device. Some electronic components on the body of the jet fire extinguishing device are very fragile, and the matching precision requirements between some parts are also very high. The vibration force converted from the recoil will damage the electronic components and wear parts, reducing the service life of the jet fire extinguishing device.

[0003] This case arises to solve the above problems. Summary of the invention

[0004] Therefore, in response to the above problems, the present invention proposes an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function, which has a reasonable structural design, can reduce the spraying blind spot, reduce the recoil and extend the service life of the device.

[0005] In order to solve the above technical problems, the solution adopted by the present invention is: an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function, comprising a jet fire extinguishing device body, a barrel arranged on the jet fire extinguishing device body, the barrel comprising a first barrel for water intake and a second barrel for water discharge, the first barrel is arranged on the jet fire extinguishing device body, and a vibration absorption adjustment mechanism is arranged between the first barrel and the second barrel for absorbing the vibration force generated by the water discharge of the barrel before the barrel encounters a dead angle for fire extinguishing, and adjusting the angle between the first barrel and the second barrel when the barrel encounters a dead angle for fire extinguishing to reduce the blind area of ​​fire extinguishing.

[0006] Further improvement is: the vibration absorption adjustment mechanism includes a first connecting plate, a second connecting plate, and a deformable bellows, the bellows is sealingly connected between the first barrel and the second barrel, the first connecting plate is vertically axially fixedly sleeved on the first barrel, the water outlet end of the second barrel is movably inserted on the second connecting plate, the first connecting plate and the second connecting plate are penetrated by more than two threaded connecting rods, the threaded connecting rods are parallel to the first barrel, and the threaded rods are provided with adjusting nuts on both sides of the first connecting plate and the second connecting plate for adjusting the total length between the second barrel and the first barrel, and the second barrel is provided with a vibration absorption adjustment device located between the second connecting plate and the first connecting plate, which is used to movably pull the second barrel to absorb vibration force, adjust the angle between the second barrel and the first barrel by changing the force center of the traction force, and can still absorb vibration force after the angle is adjusted.

[0007] A further improvement is that the vibration absorption adjustment device includes a first vibration absorption adjustment ring and a second vibration absorption adjustment ring, the first vibration absorption adjustment ring is fixedly sleeved on the threaded connecting rod, and the second vibration absorption adjustment ring is fixedly sleeved on the second barrel, and four or more rubber bands in a stretched state are evenly distributed between the first vibration absorption adjustment ring and the second vibration absorption adjustment ring, one end of the rubber band is arranged on the first vibration absorption adjustment ring, and the other end is arranged on the second vibration absorption adjustment ring, and the first vibration absorption adjustment ring is provided with a fuse replacement device for conveniently replacing and installing the rubber band, and changing the force center of traction by fusing at least one rubber band to adjust the angle of the second barrel.

[0008] Further improvement is: the fuse replacement device includes: a wiring channel is arranged inside the first vibration absorption adjustment ring, a connecting channel connected to the wiring channel is arranged on the inner wall of the first vibration absorption adjustment ring, an electrode plug connector is arranged in the connecting channel, a replacement sleeve is detachably arranged on the connecting channel, a rotating sleeve is rotatably arranged on the inner wall of the replacement sleeve, the lower end of the rotating sleeve passes through the replacement sleeve, a heating block is fixedly arranged in the rotating sleeve, the heating block is provided with an electrode interface plugged into the electrode rod of the electrode plug connector, the lower end of the heating block can be detached from a hot cutting block for absorbing the heat of the heating block to cut off the rubber band, and the rubber band is sleeved on the hot cutting block.

[0009] A further improvement is that an installation channel is opened inward from the side wall at the lower end of the heating block, and guide installation grooves for guiding and positioning the installation of the hot cutting block are opened on both side walls of the installation channel, and guide installation blocks matching the guide installation grooves are arranged on both sides of the hot cutting block, and an avoidance groove corresponding to the installation channel to avoid the rubber band is opened on the rotating sleeve.

[0010] A further improvement is that the guide installation groove is opened from the side wall of the heating block in an inward and downward manner.

[0011] A further improvement is that: a mounting ring for the rubber band to pass through is arranged on the outer wall of the second vibration absorbing adjustment ring, the middle part of the rubber band is passed through the mounting ring, and the two ends are stretched and sleeved on the hot cutting block.

[0012] A further improvement is that the upper end of the hot cutting block is provided with a tip portion for accelerating the cutting of the rubber band.

[0013] A further improvement is that the jet fire extinguishing device body is connected to a main control box for automatically tracking and locating the fire source for extinguishing the fire, and a sub-control box for manually controlling the tracking of the fire source for extinguishing the fire.

[0014] A further improvement is that a monitoring module is provided on the circuit board of the jet fire extinguishing device body for monitoring whether the electronic components on the circuit board have functional failures, whether the voltage is normal, whether it is in a fire alarm state, and transmitting the monitoring information to the device.

[0015] A further improvement is that the main control box is signal-connected to a mobile terminal device for receiving the fire alarm status and remotely controlling the main control box to extinguish the fire.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are:

[0017] In this case, the middle barrel is divided into the first barrel and the second barrel. The water outlet position is adjusted by adjusting the relative angle between the first barrel and the second barrel to reduce the fire blind area. The first barrel and the second barrel are connected by a bellows to effectively reduce the vibration force transmitted to the jet fire extinguishing device body, effectively protecting the jet fire extinguishing device body and extending its service life.

[0018] A further beneficial effect is that the total length between the second barrel and the first barrel can be adjusted according to the movable space of the installation position to avoid the influence of the surrounding pipelines on the activity of the second barrel. If the installation position has little effect on the barrel length, the length of the bellows can be increased through adjustment to improve the vibration reduction capacity of the bellows.

[0019] Further beneficial effects are: the arrangement of the first vibration absorbing adjustment ring, the second vibration absorbing adjustment ring and the rubber band can further absorb the vibration force generated by the water outlet, reduce the vibration force transmitted to the bellows, and protect the jet fire extinguishing device body; at the same time, the initial traction force balance point of several rubber bands is on the central axis of the second barrel. When the rubber band is melted, the traction force of the remaining rubber bands drives the second barrel to rebalance, and the second barrel forms an angle with the first barrel to spray water into the original spray blind area.

[0020] Further beneficial effects are: in this case, heat is generated by the heating block, and the hot cutting block absorbs the heat to melt the rubber band. The hot cutting block is detachably arranged in the heating block, which is convenient for the replacement and installation of the rubber band. The pointed end arranged on the upper end of the hot cutting block can accelerate the disconnection of the rubber band. At the same time, the guide installation groove is opened at an angle to prevent the hot cutting block from being bounced off after the rubber band is disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the prior art in the background technology.

[0022] Figure 2 It is a structural schematic diagram of an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to an embodiment of the present invention.

[0023] Figure 3 It is a structural schematic diagram of a vibration absorption adjustment device in an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to an embodiment of the present invention.

[0024] Figure 4 yes Figure 3 A magnified view of the local structure at point A.

[0025] Figure 5 yes Figure 4 A magnified view of the local structure at point B in the middle.

[0026] Figure 6 It is a schematic diagram of the winding structure of rubber bands and hot cutting blocks in an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function in an embodiment of the present invention. Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] refer to Figures 1 to 6 The embodiment of the present invention discloses an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function, including a jet fire extinguishing device body 10, and a barrel arranged on the jet fire extinguishing device body 10, wherein the barrel includes a first barrel 11 for water intake and a second barrel 12 for water discharge, wherein the first barrel 11 is arranged on the jet fire extinguishing device body 10, and a vibration absorbing adjustment mechanism is arranged between the first barrel 11 and the second barrel 12 for absorbing the vibration force generated by the water discharge of the barrel before the barrel encounters a dead angle for fire extinguishing, and adjusting the angle between the first barrel 11 and the second barrel 12 when the barrel encounters a dead angle for fire extinguishing to reduce the blind area for fire extinguishing.

[0029] The vibration absorption adjustment mechanism includes a first connection plate 13, a second connection plate 14, and a deformable bellows 15, wherein the bellows 15 is sealed and connected between the first barrel 11 and the second barrel 12, wherein the first connection plate 13 is vertically and axially fixedly sleeved on the first barrel 11, and the water outlet end of the second barrel 12 is movably inserted on the second connection plate 14, and a joint bearing is arranged between the outer wall of the second barrel 12 and the second connection plate 14, and more than two threaded connecting rods 16 are penetrated on the first connection plate 13 and the second connection plate 14, and the The threaded connecting rod 16 is parallel to the first barrel 11, and adjusting nuts for adjusting the total length between the second barrel 12 and the first barrel 11 are provided on both sides of the first connecting plate 13 and the second connecting plate 14 on the threaded rod. A vibration absorption adjustment device for movably pulling the second barrel 12 to absorb vibration force, adjusting the angle between the second barrel 12 and the first barrel 11 by changing the force center of the traction force, and still absorbing vibration force after the angle is adjusted is provided on the second barrel 12 between the second connecting plate 14 and the first connecting plate 13.

[0030] The vibration absorption adjustment device includes a first vibration absorption adjustment ring 17 and a second vibration absorption adjustment ring 18. The first vibration absorption adjustment ring 17 is fixedly sleeved on the threaded connecting rod 16, and the second vibration absorption adjustment ring 18 is fixedly sleeved on the second barrel 12. Four or more rubber bands 19 in a stretched state are evenly distributed between the first vibration absorption adjustment ring 17 and the second vibration absorption adjustment ring 18. One end of the rubber band 19 is arranged on the first vibration absorption adjustment ring 17, and the other end is arranged on the second vibration absorption adjustment ring 18. The first vibration absorption adjustment ring 17 is provided with a fusing replacement device for conveniently replacing and installing the rubber band 19, and changing the force center of traction by fusing at least one rubber band 19 to adjust the angle of the second barrel 12.

[0031] The fuse replacement device includes: a wiring channel is arranged inside the first vibration absorbing adjustment ring 17, a connecting channel 20 connected with the wiring channel is arranged on the inner wall of the first vibration absorbing adjustment ring 17, an electrode plug connector 21 is arranged in the connecting channel 20, a replacement sleeve 22 is detachably arranged on the connecting channel 20, a rotating sleeve 23 is rotatably arranged on the inner wall of the replacement sleeve 22, the lower end of the rotating sleeve 23 passes through the replacement sleeve 22, a heating block 24 is fixedly arranged in the rotating sleeve 23, an electrode interface 25 which is plugged into the electrode rod of the electrode plug connector 21 is arranged on the heating block 24, a heat cutting block 26 which is detachably arranged at the lower end of the heating block 24 for absorbing the heat of the heating block 24 to cut off the rubber band 19, and the rubber band 19 is sleeved on the heat cutting block 26. A mounting ring 27 for the rubber band 19 to pass through is provided on the outer wall of the second vibration absorbing adjustment ring 18. The middle part of the rubber band 19 is inserted into the mounting ring 27, and the two ends are stretched and sleeved on the hot cutting block 26. When either end of the rubber band 19 is melted, the rubber band 19 can be separated from the first vibration absorbing adjustment ring 17, which provides double insurance to ensure that the rubber band 19 can be melted smoothly. The upper end of the hot cutting block 26 is also provided with a tip portion 28 for accelerating the cutting of the rubber band 19. The lower end of the heating block 24 is provided with an installation channel 29 inwardly from the side wall, and guide installation grooves 30 for guiding and positioning the installation of the hot cutting block 26 are provided on the two side walls of the installation channel 29. The guide installation grooves 30 are provided inwardly and downwardly from the side walls of the heating block 24 to prevent the hot cutting block 26 from being bounced off after the rubber band 19 melts and causes the loss of parts. Guide installation blocks 32 that match the guide installation grooves 30 are integrally provided on both sides of the hot cutting block 26, and an avoidance groove 31 corresponding to the installation channel 29 to avoid the rubber band 19 is provided on the rotating sleeve 23.

[0032] The replacement method of the rubber band 19 is as follows: when the rubber band 19 is melted, the replacement sleeve 22 is disassembled from the thread of the connecting channel 20, and the hot cutting block 26 is poured out from the guide installation channel 29. The middle part of the new rubber band 19 passes through the installation ring 27 on the second vibration absorbing adjustment block, and the two ends are sleeved on the hot cutting block 26, and the hot cutting block 26 is installed in the installation channel 29 along the guide installation channel 29. The material of the rotating sleeve 23 is polytetrafluoroethylene, and the long-term working temperature can reach 260 degrees, and the short-term working temperature is 280 degrees. The rubber band 19 can be melted at 120 degrees. The heating block 24 and the hot cutting block 26 are both made of metal copper. The intelligent Internet of Things system controls the heating block 24 to heat up and controls the heating temperature within 250 degrees.

[0033] The jet fire extinguishing device body is connected to the signal of a main control box for automatically tracking and locating the fire source for extinguishing the fire, and a sub-control box for manually controlling the tracking of the fire source for extinguishing the fire. The main control box is connected to a mobile terminal device for receiving the fire alarm status and remotely controlling the main control box to extinguish the fire. The main control box is arranged in the fire control room of the building, and the sub-control box is arranged at the site where the jet fire extinguishing device body is installed. The mobile terminal device can be carried by the person in charge. The circuit board of the jet fire extinguishing device body is provided with a monitoring module for monitoring whether the electronic components on the circuit board have functional failures, whether the voltage is normal, whether it is in a fire alarm state, and transmitting the monitoring information to the monitoring module. The detection module can intermittently detect the jet fire extinguishing device body at a fixed time, and transmit the monitoring results to the main control box. The main control box transmits the monitoring results to the mobile terminal device. At the same time, the main control box can be controlled on the mobile terminal device, and the jet fire extinguishing device body can be locked through the mobile terminal device to prevent others from operating the jet fire extinguishing device. The mobile terminal device can be an existing controller with a panel such as a mobile phone or a tablet. The main control box and the sub-control box are both existing technologies, and will not be described in detail here.

[0034] A method for using an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function:

[0035] The total length between the second barrel 12 and the first barrel 11 is adjusted according to the movable space of the installation position to avoid the influence of the surrounding pipelines on the movement of the second barrel 12. If the installation position has little effect on the barrel length, the length of the bellows 15 is increased through adjustment to improve the vibration reduction capacity of the bellows 15.

[0036] The sensing element of the jet fire extinguishing device body 10 is arranged on the water outlet end of the second barrel. No matter to which angle the second barrel 12 is adjusted, the coordinate system can be established with the current position of the second barrel 12 to calculate the fire source position so as to adjust the alignment position of the water outlet of the second barrel 12.

[0037] When the second barrel 12 still cannot aim at the fire source after rotating to the maximum angle, the intelligent IoT system determines the location of the fire source and heats the heating block 24 at the corresponding position according to the location of the fire source. The heat-cutting block 26 absorbs the heat from the heating block 24 to melt the rubber band 19. When the fire source is located between two heating blocks 24, the water outlet position of the second barrel 12 is adjusted by melting the adjacent heating blocks 24. After the rubber band 19 is melted, the traction between the remaining rubber bands 19 is rebalanced, and the water outlet of the second barrel 12 is oriented in the direction of the side of the melted rubber band 19. When there are two or more melted rubber bands 19, the water outlet of the second barrel 12 is oriented in the direction of the middle position of several rubber bands 19.

[0038] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. An automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function, comprising a jet fire extinguishing device body and a barrel arranged on the jet fire extinguishing device body, characterized in that: The barrel comprises a first barrel for water intake and a second barrel for water discharge, the first barrel being arranged on the jet fire extinguishing device body, and a vibration absorbing adjustment mechanism being arranged between the first barrel and the second barrel for absorbing the vibration force generated by the water discharge of the barrel before the barrel encounters a fire extinguishing blind spot, and adjusting the angle between the first barrel and the second barrel when the barrel encounters a fire extinguishing blind spot to reduce the fire extinguishing blind spot; The vibration absorption adjustment mechanism includes a first connecting plate, a second connecting plate, and a deformable bellows, the bellows being sealingly connected between the first barrel and the second barrel, the first connecting plate being vertically axially fixedly sleeved on the first barrel, the water outlet end of the second barrel being movably inserted on the second connecting plate, more than two threaded connecting rods are passed through the first connecting plate and the second connecting plate, the threaded connecting rods are parallel to the first barrel, and adjusting nuts for adjusting the total length between the second barrel and the first barrel are arranged on both sides of the first connecting plate and the second connecting plate on the threaded rods, and a vibration absorption adjustment device for movably pulling the second barrel to absorb vibration force, adjusting the angle between the second barrel and the first barrel by changing the force center of the traction force, and still absorbing vibration force after the angle is adjusted is arranged on the second barrel between the second connecting plate and the first connecting plate; The vibration absorption adjustment device comprises a first vibration absorption adjustment ring and a second vibration absorption adjustment ring, the first vibration absorption adjustment ring is fixedly sleeved on the threaded connecting rod, the second vibration absorption adjustment ring is fixedly sleeved on the second barrel, four or more rubber bands in a stretched state are evenly distributed between the first vibration absorption adjustment ring and the second vibration absorption adjustment ring, one end of the rubber band is arranged on the first vibration absorption adjustment ring, and the other end is arranged on the second vibration absorption adjustment ring, and a fusing replacement device for conveniently replacing and installing the rubber band and changing the force center of traction by fusing at least one rubber band to adjust the angle of the second barrel is arranged on the first vibration absorption adjustment ring; The fuse replacement device comprises: a wiring channel is arranged inside the first vibration absorbing adjustment ring, a connecting channel connected to the wiring channel is arranged on the inner wall of the first vibration absorbing adjustment ring, an electrode plug connector is arranged in the connecting channel, a replacement sleeve is detachably arranged on the connecting channel, a rotating sleeve is arranged on the inner wall of the replacement sleeve to fit and rotate, the lower end of the rotating sleeve passes through the replacement sleeve, a heating block is fixedly arranged in the rotating sleeve, an electrode interface plugged with the electrode rod of the electrode plug connector is arranged on the heating block, a heat cutting block for absorbing the heat of the heating block to cut off the rubber band can be detached from the lower end of the heating block, and the rubber band is sleeved on the heat cutting block; The jet fire extinguishing device body is signal-connected with a main control box for automatically tracking and locating the fire source for fire extinguishing, and a sub-control box for manually controlling the tracking of the fire source for fire extinguishing. The main control box is signal-connected with a mobile terminal device for receiving the fire alarm status and remotely controlling the main control box for fire extinguishing.

2. According to claim 1, an automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function is characterized by: An installation channel is opened inward from the side wall at the lower end of the heating block, and guide installation grooves for guiding and positioning the installation of the hot cutting block are opened on both side walls of the installation channel. Guide installation blocks matching the guide installation grooves are arranged on both sides of the hot cutting block, and an avoidance groove corresponding to the installation channel to avoid the rubber band is opened on the rotating sleeve.

3. The automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to claim 2 is characterized in that: The guide installation groove is opened inwardly and downwardly from the side wall of the heating block.

4. The automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to claim 3 is characterized in that: The outer wall of the second vibration absorbing adjustment ring is provided with a mounting ring for the rubber band to pass through, the middle part of the rubber band is passed through the mounting ring, and the two ends are stretched and sleeved on the hot cutting block.

5. The automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to claim 4 is characterized in that: The upper end of the hot cutting block is provided with a tip portion for accelerating the cutting of the rubber band.

6. The automatic tracking and positioning jet fire extinguishing device with intelligent Internet of Things function according to claim 1 is characterized in that: The circuit board of the jet fire extinguishing device body is provided with a monitoring module for monitoring whether the electronic components on the circuit board have functional failures, whether the voltage is normal, whether it is in a fire alarm state, and transmitting the monitoring information.

Citation Information

Patent Citations

  • Automatic fire extinguishing method and system for intelligent gun employing compressed air foam

    CN104740818A

  • Intelligent mobile detection fire extinguishing system and working method thereof

    CN115920291A