CN106400569A - Papermaking defibrator - Google Patents
Papermaking defibrator Download PDFInfo
- Publication number
- CN106400569A CN106400569A CN201611092259.9A CN201611092259A CN106400569A CN 106400569 A CN106400569 A CN 106400569A CN 201611092259 A CN201611092259 A CN 201611092259A CN 106400569 A CN106400569 A CN 106400569A
- Authority
- CN
- China
- Prior art keywords
- papermaking
- defibrator
- thread
- seal ring
- abrasive disc
- 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
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/303—Double disc mills
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of papermaking equipment, and particularly relates to a papermaking defibrator. The papermaking defibrator comprises a motor, a control part, a grinding device, a discharge device, a preheating and cooking device, a steam pipe and a feeder, wherein the grinding device comprises a grinding head and a sealing mechanism; the grinding head comprises a shell, and a static abrasive disc and a movable abrasive disc which is correspondingly matched with the static abrasive disc are installed in the shell; the static abrasive disc is fixed to the shell by a feed pipe; the sealing mechanism comprises a steam seal ring which is installed on the shell and thread teeth which are installed on a grinding shaft, the grinding shaft penetrates through the steam seal ring, one end of the grinding shaft extends into the shell, and the end of the grinding shaft is connected with the movable abrasive disc; the steam seal ring sleeves the thread teeth and corresponds to the thread teeth. The invention aims to provide the papermaking defibrator, which solves the problems of poor sealing effect and easiness in damage to the grinding shaft of an existing papermaking defibrator.
Description
Technical field
The present invention relates to paper making equipment technical field, particularly to a kind of papermaking defibrator.
Background technology
Paper production is divided into slurrying and two basic processes of papermaking.Slurrying be exactly with machinery method, chemistry method or
The method that both persons combine becomes plant fiber material dissociation into true qualities paper pulp or bleached pulp.Papermaking is then that handle is suspended in water
In paper pulp fiber, be combined into the page in accordance with various requirement through various processing.
Defibrator is an important plant equipment in paper industry, and the fiber in the timber of sheet can be entered by it
Row extracts thus obtaining required product, it is to carry out boiling using the steam of HTHP to wood chip, in uniform temperature and
Under pressure, the plant materials such as wood chip are worn into the device of fiber by the abrasive disc of defibrator, movable grinding disc and fixed during grinding
Mill cooperate be operated to input raw material be ground.
Papermaking defibrator is mainly made up of feeder, preheating steaming plant, lapping device and discharge device, and lapping device is
The main body of papermaking defibrator, has a direct impact to the fiber quality being ground.Existing defibrator lapping device is mainly by grinding
The compositions such as casing, sealing mechanism, quiet abrasive disc, dynamic abrasive disc, grinding axle system.Quiet abrasive disc is fixed on grinding casing, dynamic mill
Piece is installed on the end of grinding shaft, moves with grinding shaft.The sealing mechanism of early stage is wrapped in grinding shaft axle using asbestos cord
The packing_seal putting isolating high temperature and high pressure steam, because its sealing effectiveness is poor, frequently change, maintenance difficult, often cause
Shut down and stop production, replaced by new mechanically-sealing apparatus now, and the mechanically-sealing apparatus of precision are by HTHP
Under the influence of be easy to damage.As can be seen here, need research and design a kind of good sealing effect, adapt to the close of high temperature and high pressure environment
Seal apparatus.
Content of the invention
It is an object of the invention to provide a kind of papermaking defibrator, solve grinding shaft sealing effectiveness in existing papermaking defibrator
Poor, flimsy problem.
The purpose of the present invention is realized by following technical proposals：
A kind of papermaking defibrator it is characterised in that:Steam including motor, control section, lapping device, discharge device, preheating
Boil device, steam pipe, feeder；Described lapping device includes grinding head and sealing mechanism；Described grinding head includes housing, described
Quiet abrasive disc and the dynamic abrasive disc with described quiet abrasive disc corresponding matching are installed in housing；Described quiet abrasive disc passes through described feed pipe and institute
State housing to fix；Described sealing mechanism includes the steam seal ring installed on the housing and the thread being arranged on grinding shaft；
Wherein, described grinding shaft installs described steam seal ring, and one end extend into described enclosure interior, and end is with described dynamic abrasive disc even
Connect；Described steam seal ring is sheathed on outside described thread, and corresponding with described thread position.
Further, described thread is set around on described grinding shaft；In described steam seal ring, it is provided with along its axially spaced-apart
Multiple annular packing gear pieces；The peripheral skirt of each described annular packing gear piece is all corresponding with the crest position of described thread, institute
State and be provided with running clearance between peripheral skirt and described crest.
Further, described thread is set around on described grinding shaft；In described steam seal ring, it is provided with along its axially spaced-apart
Multiple described annular packing gear pieces；The peripheral skirt of each described annular packing gear piece is all relative with the tooth bottom position of described thread
Should, it is provided with running clearance between described peripheral skirt and described tooth bottom.
Further, described steam seal ring is provided with annular and touches mill protection tooth, and described annular is touched mill protection tooth and is perpendicularly oriented to institute
State grinding shaft, the gap of peripheral skirt and described grinding shaft that described annular touches mill protection tooth is less than the outer of described annular packing gear piece
Tooth side and the gap of described thread.
Further, the spiral thrust direction of described thread and steam leakage are in opposite direction, are pointed to by described thread
Described dynamic abrasive disc.
Further, described annular packing gear piece is contour helical teeth, and peripheral skirt tilts to steam leakage rightabout, by institute
State annular packing gear piece and point to described dynamic abrasive disc.
Further, the spacing of described annular packing gear piece is the pitch of described thread.
Further, described steam seal ring is selected with described housing and is detachably connected.
The present invention compared with prior art has the advantage that：
1. the present invention utilizes the axial thrust of thread, produces reverse damping to steam, stops steam leakage, can be described as leading
Dynamic sealing, has broken the Traditional Thinking custom of this area passive seal, it remain with enough touch mill gap in the case of, greatly
Decrease to amplitude steam leakage, improve efficiency.And device is simple, adapts to work in high temperature and high pressure environment.
2. in the present invention, described steam seal ring is provided with annular and touches mill protection tooth, and described annular is touched mill protection tooth and is perpendicularly oriented to
Described grinding shaft, the gap of peripheral skirt and described grinding shaft that described annular touches mill protection tooth is less than described annular packing gear piece
The gap of peripheral skirt and described thread, when preventing described grinding shaft from vibration occurring, the peripheral skirt of described annular gland sealing gear and institute
State the friction of screw thread tooth contact, cause device damage.
Brief description
Fig. 1 is the device connection diagram of the embodiment of the present invention one；
Fig. 2 is the structural representation (sectional view) of lapping device in the embodiment of the present invention one；
Fig. 3 is the structural representation (sectional view) of lapping device in the embodiment of the present invention two；
In figure：1- grinding shaft, 2- housing, 3- steam seal ring, 4- annular packing gear piece, 5- annular touch mill protection tooth, 6- screw thread
Tooth, 7- move abrasive disc, the quiet abrasive disc of 8-, 9- feed pipe, 10- motor, 11- control section, 12- lapping device, 13- discharge device, 14-
Running clearance, 62- ring between preheating steaming plant, 15- steam pipe, 16- feeder, the peripheral skirt crest of 61- annular gland sealing gear
Running clearance between the peripheral skirt tooth bottom of shape gland sealing gear.
Specific embodiment
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described with the enforcement it is clear that described
Example is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertical ",
The orientation of instruction such as " level ", " interior ", " outward " or position relationship are based on orientation shown in the drawings or position relationship, merely to
Be easy to describe the present invention and simplify description, rather than instruction or the hint device of indication or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or hint relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can
To be to be mechanically connected or electrical connection；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Embodiment one：
Referring to Fig. 1, Fig. 2, a kind of papermaking defibrator, including motor 10, control section 11, lapping device 12, discharge device
13rd, preheating steaming plant 14, steam pipe 15, feeder 16；First pass through feeder and material is added preheating steaming plant, charging
Device is auger type feeder, and preheating steaming plant is to carry out boiling using the steam of HTHP to material, through digested
Material afterwards, enters lapping device by feed pipe 9, provides power by motor to lapping device, and papermaking defibrator process is detected in control section
Machine operation conditions, and be adjusted controlling, the ground device of material crushes, tears and cuts off, and the wood pulp worn into is by discharge device
Discharge；If sealing is undesirable, can affect to preheat steam pressure in digesting apparatus, and high temperature and high pressure steam is revealed, and can affect
Grind the working condition of axle bearing, cause grinding shaft vibration；Motor, control section, discharge device, preheating steaming plant, steam
Pipe, feeder are prior art, will not be described here；Described lapping device includes grinding head and sealing mechanism, preheating boiling dress
Material in putting enters lapping device together with high-pressure and high-temperature steam；Described grinding head includes housing 2, is provided with described housing
Quiet abrasive disc 8 and the dynamic abrasive disc 9 with described quiet abrasive disc corresponding matching, during grinding dynamic abrasive disc and quiet abrasive disc cooperate into
Row work is ground to the material of input；Described quiet abrasive disc is fixed with described housing by described feed pipe；Described sealer
Structure includes installing steam seal ring 3 on the housing and the thread 6 being arranged on grinding shaft 1, and steam seal ring is selected high temperature resistant, resistance to
Corrosion material, the direct machine-shaping of thread；Wherein, described grinding shaft installs described steam seal ring, and one end extend into described shell
Portion, and end in vivo is connected with described dynamic abrasive disc；Described steam seal ring is sheathed on outside described thread, and with described screw thread tooth position
Put correspondence.
Referring to Fig. 2, described thread is set around on described grinding shaft；In described steam seal ring, it is provided with along its axially spaced-apart
Multiple annular packing gear pieces 4；The peripheral skirt of each described annular packing gear piece is all corresponding with the crest position of described thread, institute
State and between peripheral skirt and described crest, be provided with running clearance 61.Adjacent described annular packing gear piece is cannelure, when steam enters
During cannelure, form whirlpool, produce pressure reduction, on the one hand resistance can keep off steam leakage, on the other hand, steam is forced toward described in rotor
In the helicla flute of thread, using the axial thrust of described thread, stop steam leakage, reach sealing effectiveness.
Referring to Fig. 2, Fig. 3, described steam seal ring is provided with annular and touches mill protection tooth 5, and described annular is touched mill protection tooth and vertically referred to
To described grinding shaft, the gap of peripheral skirt and described grinding shaft that described annular touches mill protection tooth is less than described annular packing gear piece
Peripheral skirt and described thread gap, when preventing described grinding shaft from vibration occurring, the peripheral skirt of described annular gland sealing gear with
Described screw thread tooth contact friction, causes device damage.
Referring to Fig. 2, Fig. 3, the spiral thrust direction of described thread and steam leakage are in opposite direction, are referred to by described thread
To described dynamic abrasive disc, using the axial thrust of described thread, stop steam leakage, reach sealing effectiveness.
Referring to Fig. 2, Fig. 3, described annular packing gear piece is contour helical teeth, and peripheral skirt tilts to steam leakage rightabout,
Described dynamic abrasive disc is pointed to by described annular packing gear piece.
Referring to Fig. 2, Fig. 3, the spacing of described annular packing gear piece is pitch, annular packing gear piece and the spiral shell of described thread
Line tooth corresponds, and has better seal effect.
Referring to Fig. 2, Fig. 3, described steam seal ring and described housing, from being detachably connected, are easy to steam seal ring maintenance and are changed.
Embodiment two：
Referring to Fig. 1, Fig. 3, the sealing mechanism in the present embodiment is the improvement on the basis of embodiment one, public in embodiment one
The technology contents not repeated description opened, embodiment one disclosure falls within the present embodiment disclosure.
Referring to Fig. 3, described thread is set around on described grinding shaft；In described steam seal ring, it is provided with along its axially spaced-apart
Multiple described annular packing gear pieces；The peripheral skirt of each described annular packing gear piece is all relative with the tooth bottom position of described thread
Should, it is provided with running clearance 62 between described peripheral skirt and described tooth bottom.When steam passes through gap, because aisle spare diminishes, in section
Under stream effect, flow velocity accelerates, reduced pressure.And in steam chest behind, form strong vortex due to the expansion in space, speed
Degree reduces, kinetic energy consumption is changed into heat energy.By being repeated continuously this process, the whole speed-shiftings until consuming steam are
Heat energy, reaches the purpose preventing or reducing leakage.
Finally it should be noted that：Various embodiments above only in order to technical scheme to be described, is not intended to limit；To the greatest extent
Pipe has been described in detail to the present invention with reference to foregoing embodiments, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, or wherein some or all of technical characteristic is entered
Row equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of papermaking defibrator it is characterised in that:Including motor, control section, lapping device, discharge device, preheating boiling
Device, steam pipe, feeder；Described lapping device includes grinding head and sealing mechanism；Described grinding head includes housing, described shell
Quiet abrasive disc and the dynamic abrasive disc with described quiet abrasive disc corresponding matching are installed in vivo；Described quiet abrasive disc pass through described feed pipe with described
Housing is fixed；Described sealing mechanism includes the steam seal ring installed on the housing and the thread being arranged on grinding shaft；Its
In, described grinding shaft installs described steam seal ring, and one end extend into described enclosure interior, and end is with described dynamic abrasive disc even
Connect；Described steam seal ring is sheathed on outside described thread, and corresponding with described thread position.
2. according to claim 1 papermaking defibrator it is characterised in that：Described thread is set around on described grinding shaft；Institute
State in steam seal ring, its axially spaced-apart is provided with multiple annular packing gear pieces；Each described annular packing gear piece peripheral skirt all with
The crest position of described thread is corresponding, is provided with running clearance between described peripheral skirt and described crest.
3. according to claim 1 papermaking defibrator it is characterised in that described thread is set around on described grinding shaft；Institute
State in steam seal ring, its axially spaced-apart is provided with multiple described annular packing gear pieces；The peripheral skirt of each described annular packing gear piece
All corresponding with the tooth bottom position of described thread, it is provided with running clearance between described peripheral skirt and described tooth bottom.
4. according to Claims 2 or 3, papermaking defibrator touches mill protection it is characterised in that described steam seal ring is provided with annular
Tooth, described annular is touched mill protection tooth and is perpendicularly oriented to described grinding shaft, and described annular touches the peripheral skirt of mill protection tooth and described grinding
The gap of axle is less than the peripheral skirt of described annular packing gear piece and the gap of described thread.
5. according to claim 4 papermaking defibrator it is characterised in that the spiral thrust direction of described thread is let out with steam
Leakage is in opposite direction, points to described grinding head by described thread.
6. according to claim 5 papermaking defibrator it is characterised in that described annular packing gear piece be contour helical teeth, external tooth
While tilting to steam leakage rightabout, described grinding head is pointed to by described annular packing gear piece.
7. according to claim 6 papermaking defibrator it is characterised in that described annular packing gear piece spacing be described screw thread
The pitch of tooth.
8. according to claim 7 papermaking defibrator it is characterised in that：Described steam seal ring is selected with described housing and is detachably connected
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092259.9A CN106400569A (en) | 2016-12-01 | 2016-12-01 | Papermaking defibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092259.9A CN106400569A (en) | 2016-12-01 | 2016-12-01 | Papermaking defibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106400569A true CN106400569A (en) | 2017-02-15 |
Family
ID=58083895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611092259.9A Pending CN106400569A (en) | 2016-12-01 | 2016-12-01 | Papermaking defibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106400569A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371734A (en) * | 2018-12-06 | 2019-02-22 | 喻丽芬 | A kind of paper grade (stock) wood raw material defibrator process processing equipment |
| CN112476689A (en) * | 2020-11-10 | 2021-03-12 | 菏泽市宁丰木业有限公司 | Use method for realizing production of high-quality fibers by utilizing high-precision defibrator |
| CN114383347A (en) * | 2021-12-17 | 2022-04-22 | 西北工业大学 | Device and method for preparing ice crystals at normal temperature |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3908374A1 (en) * | 1988-03-21 | 1989-10-05 | Sunds Defibrator Jylha Oy | Seal for sealing the leadthrough of a rotatable shaft of a refiner |
| DE3908372A1 (en) * | 1988-03-21 | 1989-10-05 | Sunds Defibrator Jylha Oy | Seal for sealing the leadthrough of a rotatable shaft of a refiner |
| CN2681877Y (en) * | 2003-11-18 | 2005-03-02 | 上海人造板机器厂有限公司 | Mechanical sealing device for defibrator |
| CN200975488Y (en) * | 2006-11-16 | 2007-11-14 | 江苏科行环境工程技术有限公司 | Sealing device used between horizontal rolls milling dynamic and static revolving part |
| CN201460994U (en) * | 2009-07-02 | 2010-05-12 | 苏洪洲 | Novel double-tooth sharp-lateral-tooth steam seal |
| CN102985639A (en) * | 2010-07-13 | 2013-03-20 | 西门子公司 | Sealing element for sealing a gap |
| CN104454032A (en) * | 2014-10-22 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Steam seal method and structure for steam turbine |
| CN204492901U (en) * | 2014-12-26 | 2015-07-22 | 江苏鑫信润科技有限公司 | A kind of multistage anti-dropping type brush steam seal ring |
-
2016
- 2016-12-01 CN CN201611092259.9A patent/CN106400569A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3908374A1 (en) * | 1988-03-21 | 1989-10-05 | Sunds Defibrator Jylha Oy | Seal for sealing the leadthrough of a rotatable shaft of a refiner |
| DE3908372A1 (en) * | 1988-03-21 | 1989-10-05 | Sunds Defibrator Jylha Oy | Seal for sealing the leadthrough of a rotatable shaft of a refiner |
| CN2681877Y (en) * | 2003-11-18 | 2005-03-02 | 上海人造板机器厂有限公司 | Mechanical sealing device for defibrator |
| CN200975488Y (en) * | 2006-11-16 | 2007-11-14 | 江苏科行环境工程技术有限公司 | Sealing device used between horizontal rolls milling dynamic and static revolving part |
| CN201460994U (en) * | 2009-07-02 | 2010-05-12 | 苏洪洲 | Novel double-tooth sharp-lateral-tooth steam seal |
| CN102985639A (en) * | 2010-07-13 | 2013-03-20 | 西门子公司 | Sealing element for sealing a gap |
| CN104454032A (en) * | 2014-10-22 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Steam seal method and structure for steam turbine |
| CN204492901U (en) * | 2014-12-26 | 2015-07-22 | 江苏鑫信润科技有限公司 | A kind of multistage anti-dropping type brush steam seal ring |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371734A (en) * | 2018-12-06 | 2019-02-22 | 喻丽芬 | A kind of paper grade (stock) wood raw material defibrator process processing equipment |
| CN112476689A (en) * | 2020-11-10 | 2021-03-12 | 菏泽市宁丰木业有限公司 | Use method for realizing production of high-quality fibers by utilizing high-precision defibrator |
| WO2022099443A1 (en) * | 2020-11-10 | 2022-05-19 | 菏泽市宁丰木业有限公司 | Method for using high-precision thermal grinder to implement production of high-quality fibre |
| CN114383347A (en) * | 2021-12-17 | 2022-04-22 | 西北工业大学 | Device and method for preparing ice crystals at normal temperature |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106400569A (en) | Papermaking defibrator | |
| EP0566570B1 (en) | Controlled intensity high speed double disc refiner | |
| WO1979001001A1 (en) | Intermeshing screw-type refiner | |
| CN104024641B (en) | Pump with double- suction impeller generating axial thrust | |
| CA1246374A (en) | Two stage high consistency refiner | |
| CA2604639C (en) | Disc housing | |
| RU2005121443A (en) | DISK REFINER (OPTIONS), A Pair of REFINING ELEMENTS FOR DISK REFINER (OPTIONS), COMBINED DISK REFINER PLATE AND METHOD FOR THERMOMECHANICAL REFINING OF WOOD CHIP | |
| CN102032349A (en) | Adjustable labyrinth sealing device | |
| CN103061190B (en) | Cylindrical single-grinding grinder | |
| CN206356072U (en) | A kind of new feed inlet of globe mill seal assembly | |
| CN103398012B (en) | Nuclear power station start and stop feed water pump | |
| CN207016897U (en) | A kind of novel papermaking defibrator | |
| CN205001515U (en) | Design has bearing seal of labyrinth seals structure | |
| CN103628344A (en) | High seal performance double-disc pulping machine | |
| CN202483955U (en) | Pulp pump | |
| CN207349009U (en) | A kind of horizontal axis Francis turbine generating set shaft seal | |
| US20190309471A1 (en) | Defibrator with separated blow valve | |
| WO2014098746A1 (en) | Gastight reactor comprising rotating crushing means | |
| CN203431180U (en) | Main shaft seal sand prevention isolating device of preimpregnation tower blender | |
| CN208055749U (en) | A kind of efficient shredded paper system | |
| CN209317763U (en) | A kind of novel slimer pedestal | |
| CN204644757U (en) | A kind of rotary drum pulping machine | |
| CN106979115A (en) | Reaction turbine and its spindle seal system | |
| CN201753808U (en) | Hydraulic rotary joint | |
| CN218423331U (en) | Dense medium cyclone for coal mine separation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170215 |
|
| WD01 | Invention patent application deemed withdrawn after publication |