CN216537644U - Tail gas washing and purifying device for copper smelting - Google Patents

Tail gas washing and purifying device for copper smelting Download PDF

Info

Publication number
CN216537644U
CN216537644U CN202123375587.9U CN202123375587U CN216537644U CN 216537644 U CN216537644 U CN 216537644U CN 202123375587 U CN202123375587 U CN 202123375587U CN 216537644 U CN216537644 U CN 216537644U
Authority
CN
China
Prior art keywords
box
washing
cleaning
purifying
pipe
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.)
Active
Application number
CN202123375587.9U
Other languages
Chinese (zh)
Inventor
窦付坤
马乐
郭文杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanmenxia Hongda Chemical Anti Corrosion Equipment Co ltd
Original Assignee
Sanmenxia Hongda Chemical Anti Corrosion Equipment Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanmenxia Hongda Chemical Anti Corrosion Equipment Co ltd filed Critical Sanmenxia Hongda Chemical Anti Corrosion Equipment Co ltd
Priority to CN202123375587.9U priority Critical patent/CN216537644U/en
Application granted granted Critical
Publication of CN216537644U publication Critical patent/CN216537644U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The utility model relates to a tail gas washing and purifying device for copper smelting, which relates to the technical field of copper smelting, and comprises a washing box and a purifying box, wherein washing water is poured into the washing box, washing liquid is poured into the purifying box, a first exhaust fan is fixed on the side wall of the washing box, the bottom of an air outlet pipe of the first exhaust fan is communicated with a first transverse pipe, the first transverse pipe penetrates through the side wall of the washing box and extends into the washing box, a first through hole is formed in the surface of one end, located at the inner cavity of the washing box, of the first transverse pipe, and a filter screen plate is fixedly connected inside the washing box. The using effect of the device is greatly improved.

Description

Tail gas washing and purifying device for copper smelting
Technical Field
The utility model relates to the technical field of copper smelting, in particular to a tail gas washing and purifying device for copper smelting.
Background
Can produce waste gas when copper is smelted, need tail gas processing apparatus to handle the back and just can release the outside, the dust granule of current tail gas processing apparatus in order to detach tail gas, set up the filter screen usually and filter tail gas, but a large amount of dust granules can pile up rapidly on the filter screen during in-service use, thereby cause the filter screen to block up easily, need the continuous mediation of clearing up of manual work, very influence work efficiency, and current tail gas processing apparatus can not carry out stage treatment to tail gas, make tail gas treatment not thorough.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a tail gas washing and purifying device for copper smelting.
The technical scheme is as follows: the cleaning device comprises a cleaning box and a purifying box, cleaning water is filled in the cleaning box, cleaning liquid is filled in the purifying box, a first exhaust fan is fixed on the side wall of the cleaning box, the bottom of an air outlet pipe of the first exhaust fan is communicated with a first transverse pipe, the first transverse pipe penetrates through the side wall of the cleaning box and extends into the cleaning box, a first through hole is formed in the surface of one end, located in an inner cavity of the cleaning box, of the first transverse pipe, a filter screen plate is fixedly connected in the cleaning box, a cleaning mechanism capable of automatically cleaning the filter screen plate is arranged at the top of the filter screen plate, a water feeding pipe is arranged at the top of the cleaning box, a top cover covers the top of the water feeding pipe, a water outlet pipe is arranged at the bottom of the cleaning box, and a water outlet valve is mounted on the water outlet pipe;
the lateral wall fixedly connected with second air exhauster of purifying box, the intake pipe of second air exhauster with it is linked together to wash incasement portion, the outlet duct bottom intercommunication of second air exhauster has the second to violently manage, the second is violently managed and is run through the lateral wall of purifying box and is extended to inside the purifying box, the second is violently managed and is located the second through-hole has been seted up on the surface of purifying box inner chamber one end, the inside detachable of purifying box is connected with the active carbon filter screen, the top of purifying box is provided with the opening, the opening part lid has closed the case lid, be provided with the breather pipe on the case lid, the bottom of purifying box is provided with the drain pipe, install out the liquid valve on the drain pipe.
Preferably, clearance mechanism is including rotating the connection and being in wash the threaded rod of incasement portion, wash the lateral wall fixedly connected with backup pad of case, install driving motor in the backup pad, the one end of threaded rod is run through wash the lateral wall of case and with driving motor's output shaft fixed connection, wash the inside of case and go back a pair of slide bar of fixedly connected with, the slide bar with threaded rod parallel arrangement, it still is provided with the movable plate to wash incasement portion, the middle part of movable plate seted up with threaded rod matched with screw hole, still seted up on the movable plate with slide bar matched with gliding sliding opening, the bottom of movable plate is passed through the flexible subassembly and is connected the washing board, the cleaning brush is installed to the bottom surface of washing board.
Preferably, the telescopic assembly comprises a telescopic column fixedly connected between the moving plate and the cleaning plate, and a compression spring is sleeved on the telescopic column.
Preferably, the bottoms of the inner cavities of the cleaning box and the purifying box are in a conical structure.
Preferably, the air inlet pipe of the first exhaust fan is connected with an air suction hood.
Preferably, the air inlet pipe of the second exhaust fan is fixedly connected to the side wall of the purification box through a pipe hoop.
Preferably, a circle of convex edge is arranged inside the purification box, and the activated carbon filter screen is placed on the convex edge.
Preferably, the side walls of the cleaning box and the purifying box are embedded with observation windows at positions close to the bottoms.
Preferably, the bottom of wasing case and purifying box all is provided with the supporting leg, the bottom fixedly connected with bottom plate of supporting leg.
The utility model provides a tail gas washing and purifying device for copper smelting, which has the beneficial effects that: according to the utility model, the cleaning box can be used for removing dust particles in the tail gas, the tail gas is cleaned through the purifying box, and then the copper smelting tail gas is subjected to grading treatment, so that the tail gas treatment is more thorough, the filter screen plate can be automatically cleaned during use, the filter holes of the filter screen plate are effectively prevented from being blocked, the cleaning box is convenient to better clean dust, and the using effect of the device is greatly improved.
Drawings
FIG. 1: the utility model provides an overall structure diagram.
FIG. 2: fig. 1 is an enlarged view of a portion a.
FIG. 3: the present invention provides an overall front view.
FIG. 4: the utility model provides a structure diagram of a cleaning mechanism in a cleaning box.
FIG. 5: the utility model provides a side view of a cleaning mechanism.
In the figure: 1-cleaning box, 2-purifying box, 3-first exhaust fan, 4-first horizontal pipe, 5-first through hole, 6-filter screen plate, 7-water feeding pipe, 8-top cover, 9-water outlet pipe, 10-water outlet valve, 11-second exhaust fan, 12-second horizontal pipe, 13-second through hole, 14-active carbon filter screen, 15-box cover, 16-bottom plate, 17-vent pipe, 18-liquid outlet pipe, 19-liquid outlet valve, 20-threaded rod, 21-supporting plate, 22-driving motor, 23-sliding rod, 24-moving plate, 25-threaded hole, 26-sliding hole, 27-cleaning plate, 28-cleaning brush, 29-telescopic column, 30-compression spring, 31-air suction cover, 32-pipe hoop, 33-convex edge, 34-observation window and 35-supporting leg.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. In the description of the present invention, it should be noted that the terms "central", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or component must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The first embodiment is as follows: as shown in figures 1-3, the tail gas washing and purifying device for copper smelting comprises a washing box 1 and a purifying box 2, washing water is poured into the washing box 1, the washing water can be tap water, washing liquid is poured into the purifying box 2, the washing liquid can be lime water, and acid gases such as sulfur dioxide in the tail gas are mainly removed.
The lateral wall of wasing case 1 is fixed with first air exhauster 3, and first air exhauster 3 adopts prior art, and first air exhauster 3 passes through the fix with screw at the lateral wall of wasing case 1, and the outlet duct bottom intercommunication of first air exhauster 3 has first violently pipe 4, and first violently pipe 4 passes through the pipe joint fixed connection among the prior art with the outlet duct of first air exhauster 3. The first horizontal pipe 4 penetrates through the side wall of the cleaning box 1 and extends to the inside of the cleaning box 1, namely a through hole is formed in the side wall of the cleaning box 1, and the side wall of the first horizontal pipe 4 is fixedly connected with the through hole. The surface of the first horizontal pipe 4 at one end of the inner cavity of the cleaning box 1 is provided with a first through hole 5.
The inside of the cleaning box 1 is fixedly connected with a filter screen plate 6, the filter screen plate 6 can be directly welded on the inner wall of the cleaning box 1, the top of the filter screen plate 6 is provided with a cleaning mechanism capable of automatically cleaning the filter screen plate 6, as shown in figures 4 and 5, the cleaning mechanism comprises a threaded rod 20 which is rotatably connected inside the cleaning box 1, the threaded rod 20 is rotatably connected on the inner wall of the cleaning box 1 through a waterproof bearing in the prior art, the side wall of the cleaning box 1 is fixedly connected with a support plate 21, the support plate 21 is welded on the outer side wall of the cleaning box 1, a driving motor 22 is installed on the support plate 21, the driving motor 22 adopts the prior art, the driving motor 22 is fixed on the top surface of the support plate 21 through a screw, one end of the threaded rod 20 penetrates through the side wall of the cleaning box 1 and is fixedly connected with an output shaft of the driving motor 22 through a coupler, the inside of the cleaning box 1 is also fixedly connected with a pair of slide bars 23, the two ends of the sliding rod 23 are welded on the side wall of the cleaning box 1, the sliding rod 23 is arranged in parallel with the threaded rod 20, the pair of sliding rods 23 are symmetrically arranged by taking the threaded rod 20 as a symmetry axis, the cleaning box 1 is further internally provided with a movable plate 24, the middle of the movable plate 24 is provided with a threaded hole 25 matched with the threaded rod 20, the movable plate 24 is further provided with a sliding hole 26 matched with the sliding rod 23 for sliding, the bottom of the movable plate 24 is connected with a cleaning plate 27 through a telescopic assembly, the bottom surface of the cleaning plate 27 is provided with a cleaning brush 28, and the cleaning brush 28 is fixed on the bottom surface of the cleaning plate 27 through screws.
The telescopic assembly comprises a telescopic column 29 fixedly connected between the moving plate 24 and the cleaning plate 27 in a welding mode, the telescopic column 29 comprises a plurality of sleeves sleeved together in a sliding mode, the sleeves with small diameters are sleeved inside the sleeves with large diameters, a compression spring 30 is sleeved on the telescopic column 29, and two ends of the compression spring 30 are fixedly connected with the moving plate 24 and the cleaning plate 27 in a welding mode respectively.
When the dust cleaning device is used, the driving motor 22 is started, the driving motor 22 can drive the threaded rod 20 to rotate, the threaded rod 20 can drive the movable plate 24 to horizontally move along the threaded rod 20, the cleaning plate 27 is further driven to horizontally move, the cleaning brush 28 can be driven to move back and forth at the top of the filter screen plate 6 at the moment, and then the filter screen plate 6 is automatically cleaned, the filter holes of the filter screen plate are effectively prevented from being blocked, the bottom of the cleaning brush 28 can be tightly attached to the top of the filter screen plate 6 through the matching of the telescopic column 29 and the compression spring 30, so that dust can be better cleaned, and the using effect of the dust cleaning device is greatly improved.
Wash 1 top of case and be provided with filler pipe 7, the welding of filler pipe 7 is at the top surface of wasing case 1, the top lid of filler pipe 7 has closed top cap 8, top cap 8 passes through threaded connection at the top surface of filler pipe 7, the inside wall pad of top cap 8 has sealed the pad, the bottom of wasing case 1 is provided with outlet pipe 9, outlet pipe 9 sets up with wasing 1 integrated into one piece of case, install outlet valve 10 on the outlet pipe 9, outlet valve 10 adopts prior art, add water to wasing 1 inside of case through filler pipe 7, can be with wasing the water discharge of 1 inside of case through outlet pipe 9, conveniently trade water.
The lateral wall fixedly connected with second air exhauster 11 of purifying box 2, second air exhauster 11 adopt prior art, and second air exhauster 11 passes through the fix with screw at the lateral wall of purifying box 2, and the intake pipe of second air exhauster 11 is linked together with washing 1 insides of case, washs the lateral wall of case 1 promptly and has seted up the round hole, and the intake pipe welding of second air exhauster 11 is in the round hole.
The bottom of the outlet pipe of the second exhaust fan 11 is communicated with a second transverse pipe 12, the outlet pipe of the second transverse pipe 12 and the outlet pipe of the second exhaust fan 11 are fixedly connected through a pipe joint in the prior art, the second transverse pipe 12 penetrates through the side wall of the purifying box 2 and extends to the inside of the purifying box 2, namely, the side wall of the purifying box 2 is provided with a round hole, and the second transverse pipe 12 is fixedly connected with the round hole in a welding manner. The surface of the second horizontal pipe 12 at one end of the inner cavity of the purification box 2 is provided with a second through hole 13.
The inside detachable of purifying box 2 is connected with active carbon filter screen 14, and wherein, purifying box 2 is inside to be provided with round chimb 33, and chimb 33 sets up with purifying box 2 integrated into one piece, and active carbon filter screen 14 is placed on chimb 33. The top of purifying box 2 is provided with the opening, opening part lid has closed case lid 15, case lid 15 passes through threaded connection at the top of purifying box 2, be provided with breather pipe 17 on case lid 15, breather pipe 17 sets up with 15 integrated into one piece of case lid, the bottom of purifying box 2 is provided with drain pipe 18, drain pipe 18 sets up with 2 integrated into one piece of purifying box, install out liquid valve 19 on the drain pipe 18, drain valve 19 adopts prior art, conveniently take out active carbon filter screen 14 through opening case lid 15 and clear up and change, and open case lid 15 and conveniently add the washing water to 2 insides of purifying box, conveniently discharge the inside washing water of purifying box 2 through opening out liquid valve 19, conveniently change the inside washing water of purifying box 2.
The inner chamber bottom of wasing case 1 and purifying box 2 all is the toper structure, sets up like this and conveniently washs the whole discharges of the inside liquid of case 1 and purifying box 2.
The air inlet pipe of the first exhaust fan 3 is connected with an air suction cover 31, and the air suction cover 31 is in threaded connection with the air inlet pipe of the first exhaust fan 3.
The intake pipe of second air exhauster 11 passes through ferrule 32 fixed connection at the lateral wall of purifying box 2, and ferrule 32 passes through the screw to be connected with the lateral wall of purifying box 2, sets up ferrule 32, makes the intake pipe of second air exhauster 11 fixed firm.
The bottom of wasing case 1 and purifying box 2 all is provided with supporting leg 35, and the supporting leg 35 of the bottom of wasing case 1 and purifying box 2 is four, and supporting leg 35 evenly distributed, and the supporting leg 35 welding is in the bottom of wasing case 1, purifying box 2, and the bottom welding fixedly connected with bottom plate 16 of supporting leg 35.
The working principle is as follows: absorb the tail gas that produces with copper smelting through first air exhauster 3, and wash the washing water of case 1 inside through 5 drainage of first through-hole, impurity and dust in the tail gas precipitate after with washing water contact, play first order tail gas and handle, then tail gas upwards filters the impurity granule that does not precipitate in the tail gas through filter screen 6, play second level tail gas and handle, the gas that will wash case 1 inside through second air exhauster 11 emits into the washing water of 2 inside of purge bin, gas emits into the washing water through second through-hole 13, wash tail gas through the washing water, play third level tail gas and handle, the tail gas after the washing passes through active carbon filter screen 14 and gets rid of inside peculiar smell, play fourth level tail gas and handle, the tail gas of final treatment is discharged into the atmosphere from breather pipe 17, through layer upon layer's processing, make tail gas handle more thoroughly.
Example two: on the basis of above-mentioned embodiment, further, the lateral wall that washs case 1 and purifying box 2 is close to bottom department and all inlays and has observation window 34, and observation window 34 sets up observation window 34 through the strong glue bonding at the lateral wall of wasing case 1, purifying box 2, is convenient for observe and washs case 1, 2 inner chamber water liquid level height of purifying box, is convenient for in time change or add liquid.
In conclusion, the cleaning box can be used for removing dust particles in tail gas, the purifying box is used for washing the tail gas, and then the copper smelting tail gas is subjected to grading treatment, so that the tail gas treatment is more thorough, the filter screen plate can be automatically cleaned when the cleaning box is used, filter holes of the filter screen plate are effectively prevented from being blocked, the cleaning box is convenient to clean dust better, and the using effect of the device is greatly improved.
While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (9)

1. The tail gas washing and purifying device for copper smelting comprises a washing box (1) and a purifying box (2), washing water is poured into the washing box (1), washing liquid is poured into the purifying box (2), and the tail gas washing and purifying device is characterized in that a first exhaust fan (3) is fixed on the side wall of the washing box (1), the bottom of an outlet pipe of the first exhaust fan (3) is communicated with a first transverse pipe (4), the first transverse pipe (4) penetrates through the side wall of the washing box (1) and extends into the washing box (1), a first through hole (5) is formed in the surface of one end, located at the inner cavity of the washing box (1), of the first transverse pipe (4), a filter screen plate (6) is fixedly connected inside the purifying box (2), a cleaning mechanism capable of automatically cleaning the filter screen plate (6) is arranged at the top of the filter screen plate (6), and a water adding pipe (7) is arranged at the top of the washing box (1), a top cover (8) is covered on the top of the water feeding pipe (7), a water outlet pipe (9) is arranged at the bottom of the cleaning box (1), and a water outlet valve (10) is arranged on the water outlet pipe (9);
the side wall of the purification box (2) is fixedly connected with a second exhaust fan (11), an air inlet pipe of the second exhaust fan (11) is communicated with the inside of the cleaning box (1), the bottom of an air outlet pipe of the second exhaust fan (11) is communicated with a second transverse pipe (12), the second horizontal pipe (12) penetrates through the side wall of the purifying box (2) and extends to the inside of the purifying box (2), a second through hole (13) is arranged on the surface of one end of the second transverse pipe (12) positioned in the inner cavity of the purifying box (2), an active carbon filter screen (14) is detachably connected in the cleaning box (1), an opening is arranged at the top of the purifying box (2), a box cover (15) is covered at the opening, the air purification box is characterized in that a vent pipe (17) is arranged on the box cover (15), a liquid outlet pipe (18) is arranged at the bottom of the purification box (2), and a liquid outlet valve (19) is arranged on the liquid outlet pipe (18).
2. The tail gas washing and purifying device for copper smelting according to claim 1, wherein the cleaning mechanism comprises a threaded rod (20) rotatably connected inside the cleaning box (1), the side wall of the cleaning box (1) is fixedly connected with a support plate (21), a driving motor (22) is installed on the support plate (21), one end of the threaded rod (20) penetrates through the side wall of the cleaning box (1) and is fixedly connected with an output shaft of the driving motor (22), the inside of the cleaning box (1) is also fixedly connected with a pair of slide rods (23), the slide rods (23) are arranged in parallel with the threaded rod (20), a moving plate (24) is also arranged inside the cleaning box (1), a threaded hole (25) matched with the moving plate (20) is formed in the middle of the moving plate (24), and a sliding hole (26) matched with the slide rod (23) for sliding is further formed in the moving plate (24), the bottom of the moving plate (24) is connected with a cleaning plate (27) through a telescopic assembly, and a cleaning brush (28) is mounted on the bottom surface of the cleaning plate (27).
3. The copper smelting tail gas washing and purifying device according to claim 2, wherein the telescopic assembly comprises a telescopic column (29) fixedly connected between the moving plate (24) and the cleaning plate (27), and a compression spring (30) is sleeved on the telescopic column (29).
4. The copper smelting tail gas washing and purifying device according to claim 1, wherein the bottoms of the inner cavities of the cleaning box (1) and the purifying box (2) are both in a conical structure.
5. The copper smelting tail gas washing and purifying device according to claim 1, wherein the air inlet pipe of the first exhaust fan (3) is connected with an air suction hood (31).
6. The copper smelting tail gas washing and purifying device according to claim 1, wherein the air inlet pipe of the second exhaust fan (11) is fixedly connected to the side wall of the purifying box (2) through a pipe hoop (32).
7. The copper smelting tail gas washing and purifying device according to claim 1, wherein a circle of convex edge (33) is arranged inside the purifying box (2), and the activated carbon filter screen (14) is placed on the convex edge (33).
8. The copper smelting tail gas washing and purifying device according to claim 1, wherein observation windows (34) are embedded in the side walls of the washing box (1) and the purifying box (2) near the bottom.
9. The copper smelting tail gas washing and purifying device according to claim 1, wherein the bottom of the washing tank (1) and the bottom of the purifying tank (2) are both provided with supporting legs (35), and the bottom of each supporting leg (35) is fixedly connected with a bottom plate (16).
CN202123375587.9U 2021-12-30 2021-12-30 Tail gas washing and purifying device for copper smelting Active CN216537644U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123375587.9U CN216537644U (en) 2021-12-30 2021-12-30 Tail gas washing and purifying device for copper smelting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123375587.9U CN216537644U (en) 2021-12-30 2021-12-30 Tail gas washing and purifying device for copper smelting

Publications (1)

Publication Number Publication Date
CN216537644U true CN216537644U (en) 2022-05-17

Family

ID=81557981

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123375587.9U Active CN216537644U (en) 2021-12-30 2021-12-30 Tail gas washing and purifying device for copper smelting

Country Status (1)

Country Link
CN (1) CN216537644U (en)

Similar Documents

Publication Publication Date Title
CN206535819U (en) A kind of portable type cycling use of water medicine equipment cleaning sterilizing device
CN116275668B (en) Efficient pipeline welding device convenient to adjust
CN217188646U (en) High-efficient industrial waste gas handles scrubbing tower
CN216537644U (en) Tail gas washing and purifying device for copper smelting
CN117839296A (en) Filter vat for treating domestic sewage
CN213316374U (en) Oil smoke equipment clearance ware
CN210936337U (en) Cleaning equipment for cleaning chemical bucket
CN210176652U (en) River water pollution prevention and treatment device
CN215692888U (en) Dust treatment device for atmosphere purification
CN213215232U (en) Vegetable cleaning and sterilizing device based on hydroxyl free radicals
CN212574025U (en) Frozen shrimp meat cleaning and impurity removing all-in-one machine
CN215252582U (en) Sweeping dust-collecting vehicle
CN213961714U (en) Vortex vegetable washing machine
CN211659609U (en) Energy-concerving and environment-protective dust collecting equipment
CN210934315U (en) A particle treatment device for industrial waste gas
CN210481012U (en) Activated carbon device for sewage treatment
CN219188063U (en) Mechanical equipment maintenance dust collector
CN214272281U (en) Environment-friendly environment-friendly water tank with filtering function
CN214345371U (en) Chemical plant exhaust treatment device
CN220130995U (en) Kitchen garbage truck with filter box frame body
CN217437915U (en) A remove peculiar smell equipment for landfill leachate handles
CN218221628U (en) A high-efficient dust shaker that filters for environmental protection
CN218115169U (en) Water treatment device with good filtering and disinfecting effects
CN218188684U (en) Purification electrolysis spray set
CN218810881U (en) Experimental device for wash aeration pipe

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant