CN107084265A - Gas piping check valve special - Google Patents
Gas piping check valve special Download PDFInfo
- Publication number
- CN107084265A CN107084265A CN201710485417.5A CN201710485417A CN107084265A CN 107084265 A CN107084265 A CN 107084265A CN 201710485417 A CN201710485417 A CN 201710485417A CN 107084265 A CN107084265 A CN 107084265A
- Authority
- CN
- China
- Prior art keywords
- plate
- ring flat
- sealing ring
- bearing
- gas piping
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 54
- 210000004907 gland Anatomy 0.000 claims description 13
- 239000003063 flame retardant Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 239000011280 coal tar Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002910 structure generation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/224—Details of bearings for the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
Gas piping check valve special, the the first sealing ring flat-plate and the second sealing ring flat-plate of circular arc corresponding with inboard wall of tube body are fixed with the body of gas piping, two seal ring flat-plates along the axially staggered arrangement of body, and first the top of sealing ring flat-plate exceed the central axis of body 1, the bottom of the second sealing ring flat-plate is not up to the central axis of body；Rotated between first sealing ring flat-plate and the second sealing ring flat-plate and be provided with valve plate, valve plate is connected with the rotating shaft being eccentrically set in body, the arresting lever that limitation valve plate overturns amplitude is additionally provided with body；During roots blower normal boot-strap; check valve plate is normally-open after rated pressure is reached; the deadweight and gas pressure that valve plate is produced due to eccentric structure when shutting down are closed rapidly; so as to prevent from flowing back caused by blower fan is reversed, gases at high pressure enter blower fan; blower fan is caused to invert; so as to damage blower fan, the security performance used is substantially increased.
Description
Technical field
The present invention relates to gas piping technical field of sealing technology, more particularly to gas piping check valve special.
Background technology
The effect of check-valves is to prevent that backflow gases at high pressure enter blower fan caused by blower fan is reversed, and cause blower fan anti-
Turn, so as to damage blower fan.Traditional check-valves is connected in horizontal fan pipeline by pipeline pipe connecting flange, and this check-valves exists
Common roots blower is feasible in.But in some special industries, coal is conveyed especially with roots blower
During gas, it is necessary to assure gas piping system sealing is good, No leakage, this requires check-valves to have high sensitivity, and
Gas piping check-valves is easily precipitated by coal tar mist of oil in the case of long-term work and blocked, and causes non-return to act on failure, so as to produce
Raw serious consequence, to improve production safety and production efficiency, therefore the necessary periodic cleaning of check-valves is repaired, and conventional check valves are necessary
Maintenance could be cleared up by being pulled down completely from pipe-line system.
The content of the invention
To overcome problems of the prior art, the invention provides a kind of gas piping check valve special.
The technical scheme adopted by the invention to solve the technical problem is that：This kind of gas piping check valve special, gas pipe
Corresponding with inboard wall of tube body semicircular first sealing ring flat-plate and the second sealing ring flat-plate, the first sealing are fixed with the body in road
Ring flat-plate and the second sealing ring flat-plate are along the axially staggered arrangement of body, and the first top for sealing ring flat-plate exceedes the central axis of body,
The top of first sealing ring flat-plate is provided with a breach, and the bottom of the second sealing ring flat-plate is not up to the central axis of body；First sealing
Rotated between ring flat-plate and the second sealing ring flat-plate and be provided with valve plate, valve plate is connected with the rotating shaft being eccentrically set in body, also set in body
Restricted valve plate overturns the arresting lever of amplitude；When blower fan is started shooting, reach that the valve plate of check-valves after rated pressure is just normally opened in body
Open；When blower fan shuts down, the valve plate of check-valves is closed.
Further, the first sealing ring flat-plate and the second sealing ring flat-plate are fixed with fire-retardant caulking gum close to the side of valve plate
Pad.
Further, valve plate both sides are corresponded on body in the axial direction and is respectively provided with a service ports.
Further, the service ports are provided with joint and flange.
Further, the rotating shaft two ends stretch out and stretch out body, and rotating shaft is connected by bearing with body.
Further, the bearing is rolling bearing.
Further, the rotating shaft two ends are fixed by bearing box, gland and bearing plate, outside bearing box inwall and bearing
Circle is engaged, and gland is acted against on the outside of bearing, is fixed with bearing plate on the outside of gland, bearing plate is bolted on
On bearing box, pressing plate pad is provided between bearing plate and bearing box；Bone is provided between the wherein one end bearing plate and gland of rotating shaft
Frame oil sealing.
To sum up, above-mentioned technical proposal of the invention has the beneficial effect that：
1st, during roots blower normal boot-strap, check valve plate is normally-open after rated pressure is reached, when shut down when valve plate by
The deadweight and gas pressure produced in eccentric structure is closed rapidly, so as to prevent the high pressure gas that flowed back caused by blower fan is reversed
Body enters blower fan, causes blower fan to invert, so as to damage blower fan, substantially increases the security performance used.
2nd, check-valves rotating shaft is coupled with valve body using rolling bearing, improves the sensitivity of check-valves, so as to monitor
The seal of gas piping system.
3rd, check-valves left and right sides correspondence is provided with a service ports on body, for the cleaning of coal tar in pipeline, solution
The drawbacks of conventional check valves of having determined can only pull down cleaning, substantially increases production efficiency, it is ensured that safety in production.
4th, flame retardant rubber pad is installed on the inside of sealing ring flat-plate to ensure that check valve sealing and prevent that noise is too when valve plate from swinging
Greatly；Check valve body comes into operation after gas pressure test, it is ensured that pipe-line system seal, it is therefore prevented that the leakage of coal gas.
5th, vertical structure, both sides are provided with standard flange, and (particularly large diameter pipeline) easy for installation can prevent gas from falling
Stream, can play the connection function of pipeline again.
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention；
The sectional view that Fig. 2 is A-A in Fig. 1；
Fig. 3 is the partial enlarged drawing of part A in Fig. 2；
Fig. 4 is the partial enlarged drawing of part B in Fig. 2；
In figure：
1 body, 2 first sealing ring flat-plates, 3 second sealing ring flat-plates, 4 valve plates, 5 rotating shafts, 6 arresting levers, 7 fire-retardant caulking gums
Pad, 8 service ports, 9 joints, 10 flanges, 11 bearings, 12 bearing boxs, 13 glands, 14 bearing plates, 15 pressing plate pads, 16 skeletons oil
Envelope, 17 bolts.
Embodiment
The feature and principle of the present invention are described in detail below in conjunction with accompanying drawing 1-4, illustrated embodiment is only used for explaining
The present invention, not limits protection scope of the present invention with this.
As shown in Figure 1 and Figure 2, it is fixed with corresponding with the inwall of body 1 semicircular first in the body 1 of gas piping
Seal the sealing ring flat-plate 3 of ring flat-plate 2 and second.First sealing ring flat-plate 2 and second seals ring flat-plate 3 along the axially staggered arrangement of body 1, to scheme
Exemplified by 1, the first sealing ring flat-plate 2 is located at left side, and the second sealing ring flat-plate 3 is located at right side.And first sealing ring flat-plate 2 arc surface it is close
Laminating is fixed on the inwall of body 1, and the top of the first sealing ring flat-plate 2 is provided with a breach, facilitates the upset of valve plate, and the first sealing
The top of ring flat-plate 2 exceedes the central axis of body 1.Likewise, the arc surface laminating of the second sealing ring flat-plate 3 is fixed in body 1
On wall, and the second bottom for sealing ring flat-plate 3 is not up to the central axis of body 1, and the design coordinates the eccentric design of valve plate 4.
Rotated between the first sealing sealing ring flat-plate 3 of ring flat-plate 2 and second and be provided with valve plate 4, valve plate 4 is with being eccentrically set in body
Rotating shaft 5 is connected, by taking Fig. 1 as an example, and rotating shaft 5 is correspondingly arranged at more than central axis, close to the second sealing side position of ring flat-plate 3 one, valve
Plate 4 is fixedly connected with rotating shaft 5, and can around the shaft 5 axis direction eccentric rotary.The limitation upset width of valve plate 4 is additionally provided with body 1
The amplitude that the arresting lever 6 of degree, i.e. valve plate 4 are opened is limited by arresting lever 6, and arresting lever 6 is located at central axis, close close to first
The lower section side of seal ring plate 2.The two ends of arresting lever 6 are fixedly installed on the inwall of body 1.During roots blower normal boot-strap, when reaching
Check valve plate 4 is normally-open after rated pressure, valve plate dotted line position in such as Fig. 1.When shutting down, valve plate 4 is due to eccentric structure generation
Deadweight and gas pressure close rapidly, the valve plate left and right sides distinguish palette first sealing ring flat-plate on the right side of and second sealing
On the left of ring flat-plate.So as to prevent from flowing back caused by blower fan is reversed, gases at high pressure enter blower fan, cause blower fan to invert, so as to ruin
Bad blower fan, substantially increases the security performance used.
The first sealing sealing ring flat-plate 3 of ring flat-plate 2 and second is fixed with fire-retardant sealing rubber pad 7 close to the side of valve plate 4, protects
Check valve sealing is demonstrate,proved and has prevented that noise is too big when valve plate 4 from swinging；Check valve body comes into operation after gas pressure test, it is ensured that
Pipe-line system seal, it is therefore prevented that the leakage of coal gas.
On body 1 in the axial direction correspond to the both sides of valve plate 4 be respectively provided with a service ports 8, in pipeline coal tar it is clear
Reason, solves the drawbacks of conventional check valves can only pull down cleaning, substantially increases production efficiency, it is ensured that safety in production.
Service ports 8 are provided with joint 9 and flange 10, and the two ends of body 1 are also provided with flange 10, easy for installation (to be particularly big mouth
Footpath pipeline), gas backflow can be prevented, the connection function of pipeline can be played again.
As shown in Figure 3, Figure 4, the two ends of rotating shaft 5 stretch out and stretch out body 1, and rotating shaft 5 is connected by bearing 11 with body 1
Connect, bearing 11 is rolling bearing.The sensitivity of check-valves is improved, so as to monitor the seal of gas piping system.
As shown in Figure 3, Figure 4, the two ends of rotating shaft 5 are fixed by bearing box 12, gland 13 and bearing plate 14, in bearing box 12
Wall is engaged with bearing outer ring, and gland 13 is acted against on the outside of bearing, and bearing plate 14, bearing plate are fixed with the outside of gland
It is fixed on by bolt 17 on bearing box 12, pressing plate pad 15 is provided between bearing plate and bearing box；Wherein one end axle of rotating shaft 5
Outside framework oil seal 16 is provided between bearing plate and gland 13, it is ensured that sealing property.
Above-described embodiment is only the description carried out to the preferred embodiment of the present invention, and not the scope of the present invention is entered
Row limit, on the premise of design spirit of the present invention is not departed from, relevant technical staff in the field to the present invention various modifications and
Improve, all should expand determined by claims of the present invention in protection domain.
Claims (8)
1. gas piping check valve special, it is characterised in that be fixed with the body of gas piping corresponding with inboard wall of tube body
Semicircular first sealing ring flat-plate and the second sealing ring flat-plate, the first sealing ring flat-plate and second seal ring flat-plate along the axially staggered cloth of body
Put, and central axis of the top more than body of the first sealing ring flat-plate, the top of the first sealing ring flat-plate is provided with a breach, and second is close
The bottom of seal ring plate is not up to the central axis of body；Rotated between first sealing ring flat-plate and the second sealing ring flat-plate and be provided with valve plate, valve
Plate is connected with the rotating shaft being eccentrically set in body, and the arresting lever that limitation valve plate overturns amplitude is additionally provided with body；Blower fan is started shooting
When, reach that the valve plate of check-valves after rated pressure is normally-open in body；When blower fan shuts down, the valve plate of check-valves is closed.
2. gas piping check valve special according to claim 1, it is characterised in that the first sealing ring flat-plate and the second sealing
Ring flat-plate is fixed with fire-retardant sealing rubber pad close to the side of valve plate.
3. gas piping check valve special according to claim 1, it is characterised in that correspond to valve on body in the axial direction
Plate both sides are respectively provided with a service ports.
4. gas piping check valve special according to claim 3, it is characterised in that the service ports provided with joint and
Flange.
5. gas piping check valve special according to claim 1, it is characterised in that the rotating shaft two ends stretch out simultaneously
Body is stretched out, rotating shaft is connected by bearing with body.
6. gas piping check valve special according to claim 5, it is characterised in that the bearing is rolling bearing.
7. gas piping check valve special according to claim 5, it is characterised in that the rotating shaft two ends pass through bearing
Box, gland and bearing plate are fixed, and bearing box inwall is engaged with bearing outer ring, and gland is acted against on the outside of bearing, outside gland
Side is fixed with bearing plate, and bearing plate is bolted on bearing box, and pressing plate is provided between bearing plate and bearing box
Pad；Outside framework oil seal is provided between the wherein one end bearing plate and gland of rotating shaft.
8. gas piping check valve special according to claim 1, it is characterised in that the arresting lever is located at central axis
Position, the side below the first sealing ring flat-plate, the two ends of arresting lever are fixedly installed on inboard wall of tube body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710485417.5A CN107084265A (en) | 2017-06-23 | 2017-06-23 | Gas piping check valve special |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710485417.5A CN107084265A (en) | 2017-06-23 | 2017-06-23 | Gas piping check valve special |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107084265A true CN107084265A (en) | 2017-08-22 |
Family
ID=59607235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710485417.5A Pending CN107084265A (en) | 2017-06-23 | 2017-06-23 | Gas piping check valve special |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107084265A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396346A (en) * | 2020-03-19 | 2020-07-10 | 浙江上风高科专风实业有限公司 | Check valve convenient to control for roof type fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201277355Y (en) * | 2008-09-25 | 2009-07-22 | 聊城市鲁西化工工程设计有限责任公司 | Automatic opening and closing type non-return valve |
| CN201412569Y (en) * | 2009-05-22 | 2010-02-24 | 柳温柔 | Dual-eccentric high performance check valve |
| CN202547362U (en) * | 2012-05-09 | 2012-11-21 | 郑州京华耐火材料实业有限公司 | Gas pipeline protection device for high-temperature tunnel kiln |
| CN204942042U (en) * | 2015-09-15 | 2016-01-06 | 江苏新泰泵阀制造有限公司 | A kind of chemical mixed-flow pump suspension frame structure |
| CN206874898U (en) * | 2017-06-23 | 2018-01-12 | 山东明天机械有限公司 | Gas piping check valve special |
-
2017
- 2017-06-23 CN CN201710485417.5A patent/CN107084265A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201277355Y (en) * | 2008-09-25 | 2009-07-22 | 聊城市鲁西化工工程设计有限责任公司 | Automatic opening and closing type non-return valve |
| CN201412569Y (en) * | 2009-05-22 | 2010-02-24 | 柳温柔 | Dual-eccentric high performance check valve |
| CN202547362U (en) * | 2012-05-09 | 2012-11-21 | 郑州京华耐火材料实业有限公司 | Gas pipeline protection device for high-temperature tunnel kiln |
| CN204942042U (en) * | 2015-09-15 | 2016-01-06 | 江苏新泰泵阀制造有限公司 | A kind of chemical mixed-flow pump suspension frame structure |
| CN206874898U (en) * | 2017-06-23 | 2018-01-12 | 山东明天机械有限公司 | Gas piping check valve special |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396346A (en) * | 2020-03-19 | 2020-07-10 | 浙江上风高科专风实业有限公司 | Check valve convenient to control for roof type fan |
| CN111396346B (en) * | 2020-03-19 | 2021-02-19 | 浙江上风高科专风实业有限公司 | Check valve convenient to control for roof type fan |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109707865A (en) | Four clack types of one kind are without friction ball valve | |
| JP5306864B2 (en) | Loose short pipe fittings and pump mechanisms | |
| CN206874898U (en) | Gas piping check valve special | |
| CN107084265A (en) | Gas piping check valve special | |
| CN111623130A (en) | High-temperature and high-pressure stop valve based on labyrinth seal | |
| CN207261719U (en) | A kind of quick device with pressure for replacing valve greasing mouth | |
| CN201731162U (en) | Blow off valve of corrugated pipe | |
| RU2423640C2 (en) | Device for pipeline shut down | |
| CN210566350U (en) | Totally-enclosed pressure-resistant weighing coal feeder outlet gate valve with gas cleaning device | |
| CN210318559U (en) | Bellows sealing valve for bearing internal pressure of bellows | |
| CN111014179B (en) | Prevent butterfly valve jam from blowing structure and including butterfly valve of this structure | |
| CN212251196U (en) | Bidirectional hydraulic butterfly valve dynamic composite sealing device | |
| CN108426038A (en) | A kind of high-pressure resistant corrugated pipe shut-off valve | |
| KR200445777Y1 (en) | Pipe maintenance box with section valve of automatic waste collection system | |
| CN207796110U (en) | A kind of smoke valve lock | |
| CN209245313U (en) | A kind of auxiliary sealing coke drum overhead-valve of electronic single screw gas | |
| CN208535395U (en) | A kind of novel pressure pipeline compensating joint | |
| CN203348618U (en) | Novel pressurized sealing ball valve | |
| CN220668696U (en) | Structure for preventing gas leakage during asphalt processing | |
| CN208703195U (en) | A kind of high stability gas check valve | |
| CN106337770A (en) | Pipeline power generating station | |
| CN211693538U (en) | Corrugated pipe valve with purging port | |
| CN206786094U (en) | A kind of side valve cap valve | |
| CN205824177U (en) | A kind of Thermal generation unit hermetic seal oil catch | |
| CN215445059U (en) | Novel grinding roller door sealing device |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170822 |