CN112197022A - Gate valve convenient to maintain - Google Patents
Gate valve convenient to maintain Download PDFInfo
- Publication number
- CN112197022A CN112197022A CN202011168239.1A CN202011168239A CN112197022A CN 112197022 A CN112197022 A CN 112197022A CN 202011168239 A CN202011168239 A CN 202011168239A CN 112197022 A CN112197022 A CN 112197022A
- Authority
- CN
- China
- Prior art keywords
- valve
- rod
- outer side
- hole
- rotating sleeve
- 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.)
- Withdrawn
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Classifications
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- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
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- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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- 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
Abstract
The invention discloses a gate valve convenient to maintain, which comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, a passage is arranged on the side surface of the valve body, and a gate plate is connected in the valve cavity in a sliding manner along the vertical direction; the valve body is fixedly provided with a valve block at an opening at the upper end of the valve cavity, the upper end of the valve block is provided with a valve cover, and a valve rod is movably connected in the valve cover; the outer side of the valve block is rotatably connected with a rotating sleeve; a packing sealing element is arranged on the outer side of the valve rod in the valve cover; a slotted hole is formed in the valve block on the outer side of the valve cover, an upper plug is fixedly mounted at the upper end of the slotted hole, a lower plug is fixedly mounted at the lower end of the slotted hole, a rubber sealing element is arranged in the slotted hole between the upper plug and the lower plug, an oil hole is formed in the circumferential outer side of the valve block along the radial direction of the slotted hole, a plunger and a return spring are connected in the oil hole in a sliding manner, and an arc-shaped groove with gradually decreased depth is formed in the inner side wall of the rotary sleeve along the; the gate valve is simple in structure and convenient to maintain.
Description
Technical Field
The invention belongs to the technical field of pipeline valves, and particularly relates to a gate valve convenient to maintain.
Background
The gate valve is one of the most widely applied valves in various fluid conveying engineering, and is used as a cut-off device on fluid pipelines in the industries of building, urban environmental protection, petrifaction, medicine, food, metallurgy, textile, electric power and the like. Generally, the gate valve includes the valve body, and the valve body lower part has import and export, and the left end of import and the right-hand member of export all have sealed face, and the movive seal complex is equipped with the valve plate that can reciprocate and can not rotate between two sealed faces. Meanwhile, the upper part of the valve plate is connected with a valve rod, and the upper part of the valve rod is connected with a handle through a screw nut mechanism. After the handle rotates, the valve rod is driven to move up and down through the screw rod nut mechanism, then the valve plate moves up and down to seal or open the two sealing surfaces, and finally the feed port and the discharge port are communicated or cut off. Traditional type gate valve is in the use, in order to prevent that the medium from leaking between valve rod and the commentaries on classics cover, adopt the filler to seal at this position, the filler sets up in the packing groove, and compress tightly downwards with the gland, make the packing internal surface compress tightly the valve rod surface, the packing surface compresses tightly packing groove surface, thereby realize sealed, after opening and closing of valve many times, the friction that carries out many times is carried out to packing internal surface and valve rod surface, packing internal surface easy wearing and tearing, thereby produce and leak, and when packing wearing and tearing or damage, need pull down the valve and change, so consuming time power, increase cost of maintenance.
Disclosure of Invention
The invention aims to provide a gate valve convenient to maintain, which is simple in structure and can be maintained conveniently.
In order to solve the technical problem, the invention provides a gate valve convenient to maintain, which comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, a channel communicated with the valve cavity is arranged on the side surface of the valve body, and a gate plate for controlling the on-off of the channel is connected in the valve cavity in a sliding manner along the vertical direction; the valve body is fixedly provided with a valve block at an opening at the upper end of the valve cavity, the upper end of the valve block is provided with a valve cover, and a valve rod for controlling the flashboard to move up and down is movably connected in the valve cover; the outer side of the valve block is rotatably connected with a rotary sleeve which is used for controlling the valve cover to be detachable; a packing sealing element is arranged on the outer side of the valve rod in the valve cover; a slotted hole is formed in the valve block and outside the valve cover, an upper plug is fixedly mounted at the upper end of the slotted hole, a lower plug is fixedly mounted at the lower end of the slotted hole, and a rubber sealing element sleeved on the outer side of the valve rod is arranged in the slotted hole between the upper plug and the lower plug; an oil cavity is formed between the outer side of the rubber sealing element and the groove hole between the upper plug and the lower plug, an oil hole communicated with the oil cavity is formed in the circumferential outer side of the valve block along the radial direction of the groove hole, a plunger and a return spring for forcing the plunger to move towards the direction far away from the groove hole are connected in the oil hole in a sliding mode, and an arc-shaped groove with gradually-decreasing depth is formed in the inner side wall of the rotating sleeve along the circumferential direction; when the rotating sleeve rotates to the first position, the plunger butts against one end of the arc-shaped groove under the action of the reset spring, the rubber sealing piece is separated from the valve rod, and the valve cover is at a fixed position; when the rotating sleeve rotates to the second position, the plunger is abutted against the inner side of the rotating sleeve under the action of the return spring, the rubber sealing piece is pressed on the outer side of the circumference of the valve rod, and the valve cover is in a detachable position.
Furthermore, a convex shoulder is arranged on the outer side of the lower end of the valve cover in a radially extending mode, notches are symmetrically formed in the convex shoulder, a clamping block extending inwards is arranged at the upper end of the rotating sleeve, when the rotating sleeve rotates to the first position, the clamping block is tightly pressed on the convex shoulder, and when the rotating sleeve rotates to the second position, the clamping block rotates to the position right above the notches.
Furthermore, two first positioning pins for preventing the valve cover from rotating are arranged between the lower end of the valve cover and the upper end of the valve block.
Furthermore, a support rod is connected to the valve body in a sliding manner along the vertical direction, a connecting rod is arranged at the upper end of the support rod, a screw rod coaxial with the valve rod is connected to the connecting rod through an internal thread, and the lower end of the screw rod is connected with the upper end of the valve rod through a second positioning pin; the outer side wall of the rotating sleeve is provided with a spiral groove, and the side surface of the supporting rod is provided with a convex rod extending into the spiral groove; a positioning hole is formed in the outer side of the valve block, a third positioning pin used for being inserted into the positioning hole is arranged on the valve rod, and the supporting rod is fixed when the third positioning pin is inserted into the positioning hole; when the rotating sleeve rotates to the first position, the convex rod is located at the lower end of the spiral groove, the third positioning pin is located opposite to the positioning hole, and when the rotating sleeve rotates to the second position, the convex rod is located at the upper end of the spiral groove.
Furthermore, a hand wheel is fixedly mounted at the upper end of the screw rod.
Furthermore, a sliding hole is formed in the valve body in the vertical direction, the supporting rod is connected in the sliding hole in a sliding mode, a rotation stopping groove is formed in the inner side of the sliding hole in the vertical direction, and a rotation stopping lug connected in the rotation stopping groove in a sliding mode is fixedly arranged on the outer side of the supporting rod.
Furthermore, the lower end of the rotating sleeve of the valve body is provided with a rotating groove, the lower end of the rotating sleeve is provided with a flange positioned in the rotating groove, and the valve block is fixedly provided with a baffle ring used for pressing the flange in the rotating groove.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the invention, the packing sealing element and the rubber sealing element are arranged on the outer side of the valve rod, when the valve rod normally works, the rubber sealing element is separated from the valve rod and does not play a sealing role, only the packing sealing element and the valve rod play a sealing role, when the packing sealing element fails and leaks, the rubber sealing element and the valve rod can form a wrapping seal under the pressure action of hydraulic oil by rotating the rotating sleeve, the valve cover is in a detachable position, and the valve cover can be manually taken out to replace the packing sealing element, so that the online maintenance of the gate valve can be realized without stopping the flow of a channel medium and detaching the whole gate valve, and the maintenance is very convenient;
2. when the packing sealing element is maintained, the rotating sleeve is rotated, so that the rubber sealing element and the valve rod form a wrapping seal, the fixture block on the rotating sleeve is aligned with the notch on the valve cover, the valve cover is in a detachable position, and the valve rod and the screw form a valve cover detaching space.
Drawings
FIG. 1 is a cross-sectional view of the present invention with the gate valve in a normal operating position;
FIG. 2 is a sectional view of A-A in FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view of the present invention in service;
FIG. 5 is a sectional view taken along line A-A in FIG. 4;
FIG. 6 is a sectional view of B-B in FIG. 4;
fig. 7-8 are three-dimensional structural views of the swivel sleeve of the present invention.
Detailed Description
Referring to fig. 1 to 8, the invention provides a gate valve convenient to maintain, which includes a valve body 1, a valve cavity 101 with an opening at the upper end is arranged in the valve body 1, a passage 102 communicated with the valve cavity 101 is arranged on the side surface of the valve body 1, and a gate plate 2 for controlling the opening and closing of the passage 102 is slidably connected in the valve cavity 101 along the vertical direction; the valve body 1 is fixedly provided with a valve block 12 at an opening at the upper end of the valve cavity 101, the upper end of the valve block 12 is provided with a valve cover 8, and a valve rod 31 for controlling the gate plate 2 to move up and down is movably connected in the valve cover 8; the outer side of the valve block 12 is rotatably connected with a detachable rotating sleeve 7 for controlling the valve cover 8; a packing seal 80 is arranged on the outer side of the valve rod 31 in the valve cover 8; a slotted hole 121 is formed in the valve block 12 on the outer side of the valve cover 8, an upper plug 42 is fixedly mounted at the upper end of the slotted hole 121, a lower plug 41 is fixedly mounted at the lower end of the slotted hole 121, and a rubber sealing element 5 sleeved on the outer side of the valve rod 31 is arranged between the upper plug 42 and the lower plug 41 in the slotted hole 121; an oil cavity 5a is formed between the outer side of the rubber sealing element 5 and the groove hole 121 between the upper plug 42 and the lower plug 41, an oil hole 9a communicated with the oil cavity 5a is formed in the circumferential outer side of the valve block 12 along the radial direction of the groove hole 121, a plunger 9 and a return spring 91 for forcing the plunger 9 to move in the direction away from the groove hole 121 are connected in the oil hole 9a in a sliding mode, and an arc-shaped groove 72 with gradually-reduced depth is formed in the inner side wall of the rotary sleeve 7 along the circumferential direction; when the rotating sleeve 7 rotates to the first position, the plunger 9 props against one end of the arc-shaped groove 72 under the action of the return spring 91, the rubber sealing piece 5 is separated from the valve rod 31, and the valve cover 8 is in a fixed position; when the rotary sleeve 7 rotates to the second position, the plunger 9 is abutted against the inner side of the rotary sleeve 7 under the action of the return spring 91, the rubber seal 5 is pressed against the circumferential outer side of the valve rod 31, and the valve cover 8 is in the detachable position.
A shoulder 81a is radially and extendedly arranged on the outer side of the lower end of the valve cover 8, notches 81 are symmetrically arranged on the shoulder 81a, a clamping block 71 extending inwards is arranged at the upper end of the rotating sleeve 7, when the rotating sleeve 7 rotates to a first position, the clamping block 71 is tightly pressed on the shoulder 81a, and when the rotating sleeve 7 rotates to a second position, the clamping block 71 rotates to a position right above the notch 81. Two first positioning pins 122 for preventing the valve cover 8 from rotating are arranged between the lower end of the valve cover 8 and the upper end of the valve block 12.
A support rod 6 is connected to the valve body 1 in a sliding manner along the vertical direction, a connecting rod 6a is arranged at the upper end of the support rod 6, a screw rod 32 coaxial with the valve rod 31 is connected to the connecting rod 6a in a threaded manner, and the lower end of the screw rod 32 is connected with the upper end of the valve rod 31 through a second positioning pin 10; the outer side wall of the rotating sleeve 7 is provided with a spiral groove 73, and the side surface of the support rod 6 is provided with a convex rod 61 extending into the spiral groove 73; a positioning hole 123 is formed in the outer side of the valve block 12, a third positioning pin 11 for being inserted into the positioning hole 123 is arranged on the valve rod 31, and when the third positioning pin 11 is inserted into the positioning hole 123, the support rod 6 is fixed; when the rotating sleeve 7 rotates to the first position, the protruding rod 61 is located at the lower end of the spiral groove 73, the third positioning pin 11 is located opposite to the positioning hole 123, and when the rotating sleeve 7 rotates to the second position, the protruding rod 61 is located at the upper end of the spiral groove 73. A hand wheel 32a is fixedly arranged at the upper end of the screw rod 32.
The valve body 1 is internally provided with a sliding hole 103 along the vertical direction, the support rod 6 is connected in the sliding hole 103 in a sliding manner, the inner side of the sliding hole 103 is provided with a rotation stopping groove 104 along the vertical direction, and the outer side of the support rod 6 is fixedly provided with a rotation stopping lug 60 which is connected in the rotation stopping groove 104 in a sliding manner.
In this embodiment, the valve body 1 is provided with a rotary groove 105 at the lower end of the rotary sleeve 7, the lower end of the rotary sleeve 7 is provided with a flange 701 located in the rotary groove 105, and the valve block 12 is fixedly provided with a retaining ring 702 for pressing the flange 701 in the rotary groove 105.
When the packing seal 80 fails and leaks, the second positioning pin 10 and the third positioning pin 11 are taken out, then the rotary sleeve 7 is rotated, the plunger 9 moves towards the direction close to the groove hole 121 under the action of the arc-shaped groove 72, so that oil in the oil hole 9a is extruded into the oil cavity 5a, the rubber seal 5 and the valve rod 31 form a wrapping seal under the action of hydraulic oil pressure, and after the rubber seal 5 is sealed, the notch 81 on the valve cover 8 is just aligned with the fixture block 71 on the rotary sleeve 7, so that the valve cover 8 is in a detachable position; when the rotating sleeve 7 rotates, the supporting rod 6 is also moved upwards through the matching of the convex column and the spiral groove 73, so that the valve rod 31 and the screw rod 32 form a valve cover 8 dismounting space L, and then the valve cover 8 is manually taken out to replace the packing sealing element 80.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A gate valve convenient to maintain comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, a channel communicated with the valve cavity is arranged on the side surface of the valve body, and a gate plate for controlling the on-off of the channel is connected in the valve cavity in a sliding mode along the vertical direction; the valve is characterized in that a valve block is fixedly arranged at an opening at the upper end of the valve cavity of the valve body, a valve cover is arranged at the upper end of the valve block, and a valve rod for controlling the flashboard to move up and down is movably connected in the valve cover; the outer side of the valve block is rotatably connected with a rotary sleeve which is used for controlling the valve cover to be detachable; a packing sealing element is arranged on the outer side of the valve rod in the valve cover; a slotted hole is formed in the valve block and outside the valve cover, an upper plug is fixedly mounted at the upper end of the slotted hole, a lower plug is fixedly mounted at the lower end of the slotted hole, and a rubber sealing element sleeved on the outer side of the valve rod is arranged in the slotted hole between the upper plug and the lower plug; an oil cavity is formed between the outer side of the rubber sealing element and the groove hole between the upper plug and the lower plug, an oil hole communicated with the oil cavity is formed in the circumferential outer side of the valve block along the radial direction of the groove hole, a plunger and a return spring for forcing the plunger to move towards the direction far away from the groove hole are connected in the oil hole in a sliding mode, and an arc-shaped groove with gradually-decreasing depth is formed in the inner side wall of the rotating sleeve along the circumferential direction; when the rotating sleeve rotates to the first position, the plunger butts against one end of the arc-shaped groove under the action of the reset spring, the rubber sealing piece is separated from the valve rod, and the valve cover is at a fixed position; when the rotating sleeve rotates to the second position, the plunger is abutted against the inner side of the rotating sleeve under the action of the return spring, the rubber sealing piece is pressed on the outer side of the circumference of the valve rod, and the valve cover is in a detachable position.
2. The gate valve of claim 1, wherein: the outer side of the lower end of the valve cover is provided with a convex shoulder in a radially extending mode, the convex shoulder is symmetrically provided with notches, the upper end of the rotating sleeve is provided with a clamping block extending inwards, when the rotating sleeve rotates to a first position, the clamping block is tightly pressed on the convex shoulder, and when the rotating sleeve rotates to a second position, the clamping block rotates to a position right above the notches.
3. The gate valve of claim 2, wherein: two first locating pins for preventing the valve cover from rotating are arranged between the lower end of the valve cover and the upper end of the valve block.
4. The gate valve of claim 1, wherein: a support rod is connected to the valve body in a sliding mode along the vertical direction, a connecting rod is arranged at the upper end of the support rod, a screw rod coaxial with the valve rod is connected to the connecting rod in a threaded mode, and the lower end of the screw rod is connected with the upper end of the valve rod through a second positioning pin; the outer side wall of the rotating sleeve is provided with a spiral groove, and the side surface of the supporting rod is provided with a convex rod extending into the spiral groove; a positioning hole is formed in the outer side of the valve block, a third positioning pin used for being inserted into the positioning hole is arranged on the valve rod, and the supporting rod is fixed when the third positioning pin is inserted into the positioning hole; when the rotating sleeve rotates to the first position, the convex rod is located at the lower end of the spiral groove, the third positioning pin is located opposite to the positioning hole, and when the rotating sleeve rotates to the second position, the convex rod is located at the upper end of the spiral groove.
5. The gate valve of claim 4, wherein: and a hand wheel is fixedly arranged at the upper end of the screw rod.
6. The gate valve of claim 4, wherein: the valve body is internally provided with a sliding hole along the vertical direction, the supporting rod is connected in the sliding hole in a sliding mode, the inner side of the sliding hole is provided with a rotation stopping groove along the vertical direction, and a rotation stopping lug connected in the rotation stopping groove in a sliding mode is fixedly arranged on the outer side of the supporting rod.
7. The gate valve of claim 1, wherein: the lower end of the rotating sleeve of the valve body is provided with a rotating groove, the lower end of the rotating sleeve is provided with a flange positioned in the rotating groove, and the valve block is fixedly provided with a baffle ring used for pressing the flange in the rotating groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011168239.1A CN112197022A (en) | 2020-10-28 | 2020-10-28 | Gate valve convenient to maintain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011168239.1A CN112197022A (en) | 2020-10-28 | 2020-10-28 | Gate valve convenient to maintain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112197022A true CN112197022A (en) | 2021-01-08 |
Family
ID=74011685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011168239.1A Withdrawn CN112197022A (en) | 2020-10-28 | 2020-10-28 | Gate valve convenient to maintain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112197022A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011247352A (en) * | 2010-05-27 | 2011-12-08 | Sekisui Chem Co Ltd | Locking structure of valve |
| CN102679031A (en) * | 2011-03-15 | 2012-09-19 | 全龙浩 | Temperature control valve capable of being cleaned and maintained on line |
| CN110985692A (en) * | 2019-12-11 | 2020-04-10 | 稻映(上海)科技有限公司 | Blowoff valve convenient to installation maintenance |
| CN111520490A (en) * | 2020-05-11 | 2020-08-11 | 武芳 | Gate valve |
| CN111677876A (en) * | 2020-06-16 | 2020-09-18 | 陈少同 | Gas safety valve |
| CN111692346A (en) * | 2020-06-24 | 2020-09-22 | 李军 | Check valve |
| CN111706679A (en) * | 2020-06-24 | 2020-09-25 | 韩国昊 | Self-cleaning stop valve |
-
2020
- 2020-10-28 CN CN202011168239.1A patent/CN112197022A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011247352A (en) * | 2010-05-27 | 2011-12-08 | Sekisui Chem Co Ltd | Locking structure of valve |
| CN102679031A (en) * | 2011-03-15 | 2012-09-19 | 全龙浩 | Temperature control valve capable of being cleaned and maintained on line |
| CN110985692A (en) * | 2019-12-11 | 2020-04-10 | 稻映(上海)科技有限公司 | Blowoff valve convenient to installation maintenance |
| CN111520490A (en) * | 2020-05-11 | 2020-08-11 | 武芳 | Gate valve |
| CN111677876A (en) * | 2020-06-16 | 2020-09-18 | 陈少同 | Gas safety valve |
| CN111692346A (en) * | 2020-06-24 | 2020-09-22 | 李军 | Check valve |
| CN111706679A (en) * | 2020-06-24 | 2020-09-25 | 韩国昊 | Self-cleaning stop valve |
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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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210108 |
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| WW01 | Invention patent application withdrawn after publication |