CN113446866A - Measure survey stone rod measuring device of material level height in limekiln - Google Patents
Measure survey stone rod measuring device of material level height in limekiln Download PDFInfo
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- CN113446866A CN113446866A CN202010220134.XA CN202010220134A CN113446866A CN 113446866 A CN113446866 A CN 113446866A CN 202010220134 A CN202010220134 A CN 202010220134A CN 113446866 A CN113446866 A CN 113446866A
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- kiln
- sealing sleeve
- stone
- rod
- sleeve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0035—Devices for monitoring the weight of quantities added to the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0035—Devices for monitoring the weight of quantities added to the charge
- F27D2021/0042—Monitoring the level of the solid charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a stone detection rod measuring device for measuring the material level height in a lime kiln, which comprises a sealing sleeve arranged on a kiln top opening through which a stone detection rod passes, the stone detection rod for detecting the material level height in the lime kiln, an exhaust pipe for connecting the inner cavity of the sealing sleeve with a kiln gas main pipe of the lime kiln, and a steel wire rope connected with the stone detection rod and used for controlling the stone detection rod to enter the lime kiln, wherein the sealing sleeve is provided with an inner cavity, the outer wall of one side of the sealing sleeve is provided with a side hole, one end of the exhaust pipe is connected with the side hole of the sealing sleeve, the other end of the exhaust pipe is connected with the kiln gas main pipe of the lime kiln, a hole in the center of the sealing sleeve is aligned with the kiln top opening, and the stone detection rod passes through the hole in the center of the sealing sleeve and extends into the lime kiln through the inner cavity of the sealing sleeve and the kiln top opening. The device of the invention avoids kiln gas leakage caused by opening holes at the stone detecting rod, and reduces pollution to the environment.
Description
Technical Field
The invention belongs to the technical field of calcined limestone, and particularly relates to a stone detecting rod measuring device for measuring the material level height in a lime kiln.
Background
The lime kiln is a core device for producing alkali by an ammonia-soda process, a stone layer (height of a material level of the lime kiln) of the lime kiln is one of main process parameters of the lime kiln in a production process, the lime kiln is severely fluctuated by changes of the stone layer, a calcination area of the lime kiln is deviated due to too high or too low stone layer, and the product quality and energy consumption are influenced by the upward movement or downward movement of the calcination area. A reliable and better method is to measure the material level height in the lime kiln, and the position of the calcining area can be ensured as long as the material level of the lime kiln is ensured to fluctuate in indexes. The stone layer detection device of the existing lime kiln usually adopts a stone detection rod for measuring, namely long round steel is directly inserted into the kiln after a hole is formed in the top of the kiln, and the stone layer of the material level is measured by the distance from the round steel falling to the stone layer. The stone detecting rod is adopted for measuring, the maintenance and the use of the stone detecting rod are convenient, the stone detecting rod is required to be inserted from the opening of the kiln top, but a large amount of kiln gas can be generated in the lime calcining process of the lime kiln, the kiln gas enters the next procedure through the kiln gas main pipe at the kiln top, the kiln gas is inevitably overflowed through the hole due to the direct opening of the kiln top, the kiln gas contains a large amount of carbon dioxide, the potential safety hazard of kiln gas poisoning is brought to the operation and maintenance personnel at the kiln top, and meanwhile, the environment is also seriously polluted due to the discharge of the large amount of carbon dioxide.
Disclosure of Invention
Aiming at the danger of kiln gas leakage, environmental pollution and carbon dioxide poisoning caused by opening a hole at a stone detection rod, the invention provides a method for connecting a sealing sleeve with a kiln gas main pipe of a lime kiln by a steel pipe, wherein the sealing sleeve is arranged at the stone detection rod at the kiln top, a small round hole is formed in the side surface of the sealing sleeve, the kiln gas leaked from the stone detection rod is sucked into the kiln gas main pipe by using the negative pressure in the kiln gas main pipe at the kiln top, and the safety accidents and the environmental pollution caused by the leakage of the kiln gas are avoided. Meanwhile, the upper end of the sealing sleeve is designed into a funnel shape, a hole is formed in the center, the stone detecting rod penetrates into the kiln through the middle hole in the position, the absorption of kiln gas is facilitated through the funnel shape, and the phenomenon that the concentration of the kiln gas is influenced by the fact that a large amount of air is sucked from the position is avoided.
The invention relates to a stone detection rod measuring device for measuring the material level height in a lime kiln, which comprises a sealing sleeve arranged on a kiln top opening through which a stone detection rod passes, the stone detection rod for detecting the material level height in the lime kiln, an exhaust pipe (generally adopting a seamless steel pipe) for connecting an inner cavity of the sealing sleeve with a kiln gas main pipe of the lime kiln, and a steel wire rope connected with the stone detection rod and used for controlling the stone detection rod to enter the lime kiln, wherein the sealing sleeve is provided with an inner cavity, a side hole is formed in the outer wall of one side of the sealing sleeve, one end of the exhaust pipe is connected (preferably in a sealing way) with the side hole of the sealing sleeve, the other end of the exhaust pipe is connected (preferably in a sealing way) with the kiln gas main pipe of the lime kiln, a hole in the center of the sealing sleeve is aligned with the kiln top opening, and the stone detection rod passes through the hole in the center of the sealing sleeve and extends into the lime kiln top opening through the sealing sleeve.
Further, a funnel is arranged at the upper end of the sealing sleeve, a narrow groove (the shape and the size are consistent with the stone detecting rod passing between the funnel and the funnel, the diameter of the narrow groove is slightly larger than that of the stone detecting rod, for example, the diameter is 0.1-2mm larger), the bottom depth of the narrow groove does not reach the bottom wall of the sleeve (the distance between the bottom of the narrow groove and the bottom wall of the sleeve can be 1-5cm), and a hole penetrating through the center of the sealing sleeve at the bottom wall of the sealing sleeve is arranged at the bottom of the narrow groove. The space between the opening at the slot and the opening in the bottom wall of the sleeve forms part of the entire interior cavity of the sleeve (i.e., there is an open space between the opening of the slot and the opening in the bottom wall of the sleeve, which communicates with the interior cavity of the sleeve), and the openings are also shaped and sized to correspond to the rock shaft passing therethrough. The shape and size of the stone-detecting rod can be those of the prior art and will not be described in detail herein. The sealing sleeve may be welded or bolted to the kiln roof.
Further, the sealing sleeve is cylindrical, square or other polygonal structure, preferably cylindrical structure, the outer diameter can be 8-20cm, and the space between the wall and the bottom of the narrow groove and the outer wall and the bottom wall of the sealing sleeve at the lower part of the funnel structure and the funnel structure is an inner cavity. The sealing sleeve is typically of steel construction.
Furthermore, the steel wire rope is led into the bottom of the lime kiln after passing through a first pulley (fixed pulley) arranged on one side of the kiln top and a second pulley (fixed pulley) arranged on the kiln top right above the stone detection rod in sequence.
Furthermore, the steel wire rope is connected with the stone detecting rod through a connecting device, the connecting device is of a cylindrical structure with a closed top end and an open bottom end and is generally made of steel, the top of the connecting device is provided with a round hole for the steel wire rope to pass through and preventing the knotted steel wire rope from coming off, and the lower part of the connecting device is provided with an internal thread matched with the external thread of the stone detecting rod. The inner diameter of the cylindrical structure is such that it matches the diameter of the probe rod. The wall thickness of the cylindrical structure may be 2-8mm and the cylinder height may be 2-8 cm.
Further, the outlet of the exhaust pipe (preferably a seamless steel pipe) connected with the sealing sleeve is higher than the hole at the narrow groove at the lower part of the funnel structure of the sealing sleeve. Therefore, the hot kiln gas cannot flow to the external cold air, and the kiln gas is prevented from leaking. The inner diameter of the exhaust pipe may be 0.5 to 2cm, but is not limited thereto.
Furthermore, a circle of circle with the diameter larger than that of the outer cylinder of the sealing sleeve is arranged on the stone detecting rod above the sealing sleeve. The ring is arranged to avoid the stone detection rod from falling into the lime kiln due to the breakage of the steel wire rope at the joint of the stone detection rod, and convenience is provided for the maintenance of the equipment.
The invention has the beneficial effects that:
the sealing device for the lime kiln stone layer detection rod provided by the invention adopts a principle that a kiln gas main pipe is negative pressure, and kiln gas overflowing from a gap between a kiln top hole and the stone detection rod is sucked into the kiln gas main pipe, so that the kiln gas is prevented from overflowing. The design and application of the existing process and equipment on the site do not need excessive increase or modification of equipment, and the technical modification can be completely carried out without influencing the production while achieving good effect, and conditions are provided for later maintenance and repair.
The inner cylinder of the sealing sleeve is designed into a funnel shape, the center of the inner cylinder is provided with the hole which extends downwards but does not reach the bottom end of the outer cylinder of the sealing sleeve, and the outlet of the seamless steel tube welded on the sealing sleeve is higher than the bottom end of the hole at the center of the sealing sleeve.
Meanwhile, a circle of stone detecting rod which is larger than the diameter of the sealing sleeve is welded on the stone detecting rod which is out of the sealing sleeve, so that the stone detecting rod is prevented from falling into the lime kiln due to the fact that a connecting device or a steel wire rope is broken, and equipment is protected and is convenient to overhaul.
Drawings
FIG. 1 is a schematic view of a rock-detecting rod measuring device according to the present invention.
FIG. 2 is an enlarged view of a portion of the sealing sleeve of the rock probe measurement device of FIG. 1.
Fig. 3 is a front view of the sealing sleeve.
Fig. 4 is a left sectional view of the sealing sleeve.
Fig. 5 is a top view of the sealing sleeve.
Fig. 6 is a schematic structural view of a connecting device of a steel wire rope and a stone detecting rod.
In the figure: 1. lime kiln 2, survey stone pole, 3, kiln gas main, 4, blast pipe (seamless steel pipe), 5, sealing sleeve, 6, wire rope and survey stone pole connecting device, 7, second pulley, 8, first pulley, 9, wire rope, 10, lime kiln stone layer, 11, circle, 12, side opening, 13, the hole at sealing sleeve center, 14, funnel, 15, narrow groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-6, the invention relates to a stone detecting rod measuring device for measuring the material level in a lime kiln, which comprises a sealing sleeve 5 arranged on a kiln top opening through which a stone detecting rod 2 passes, the stone detecting rod 2 used for detecting the material level height in a lime kiln 1, an exhaust pipe 4 (generally adopting a seamless steel pipe) for connecting the inner cavity of the sealing sleeve with a kiln gas main pipe of the lime kiln, a steel wire rope 9 connected with the stone detecting rod 2 and used for controlling the stone detecting rod to enter the lime kiln, the sealing sleeve is provided with an inner cavity, and the outer wall of one side is provided with a side hole 12, one end of the exhaust pipe 4 is connected (preferably in sealing connection) with the side hole 12 of the sealing sleeve, the other end is connected (preferably in sealing connection) with the kiln gas main pipe 3 of the lime kiln, a hole 13 in the center of the sealing sleeve is aligned with the opening hole in the top of the lime kiln, and the stone detection rod 2 penetrates through the hole 13 in the center of the sealing sleeve and extends into the lime kiln through the inner cavity of the sealing sleeve and the opening hole in the top of the lime kiln.
In one embodiment, a funnel 14 is provided at the upper end of the sealing sleeve, a narrow groove 15 (of a shape and size consistent with the diameter of the rock shaft passing between them, the diameter of the narrow groove being slightly larger than the diameter of the rock shaft, for example 0.1-2mm larger) is provided below the funnel, the bottom of the narrow groove does not reach as deep as the bottom wall of the sleeve (the distance between the bottom of the narrow groove and the bottom wall of the sleeve may be 1-5cm), and the bottom of the narrow groove is provided with a hole 13 penetrating the center of the sealing sleeve at the bottom wall of the sealing sleeve. The space between the hole at the narrow groove and the hole at the bottom wall of the sleeve forms a part of the whole inner cavity of the sleeve (namely, the space between the hole of the narrow groove and the hole at the bottom wall of the sleeve is an open space and is communicated with the inner cavity of the sleeve), and the shape and the size of the hole are consistent with the shape and the size of a stone detecting rod passing through the hole (for example, equal to or larger than 0-0.2 mm). The shape and size of the rock shaft are those of the prior art and will not be described in detail here.
In one embodiment, the sealing sleeve 5 is a cylindrical, square or other polygonal structure, preferably a cylindrical structure, and may have an outer diameter of 8-20cm, and the space between the walls and bottom of the funnel structure 14 and the narrow slot 15 in the lower portion of the funnel structure and the outer and bottom walls of the sealing sleeve 5 is an inner cavity. The sealing sleeve is typically of steel construction.
Further, the steel wire rope 9 is led into the bottom of the lime kiln after passing through a first pulley 8 (fixed pulley) arranged on one side of the kiln top and a second pulley 7 (fixed pulley) arranged on the kiln top right above the stone detecting rod in sequence. The first pulley 8 (fixed pulley) and the second pulley 7 (fixed pulley) can be fixed on the kiln top.
In one embodiment, the steel wire rope 9 is connected with the stone detecting rod 2 through a connecting device 6, the connecting device 6 is a cylindrical structure with a closed top end and an open bottom end, the cylindrical structure is generally made of steel, a round hole for the steel wire rope to pass through and preventing the knotted steel wire rope from coming off is formed in the top of the connecting device, and an internal thread matched with the external thread of the stone detecting rod is formed in the lower portion of the connecting device. The inner diameter of the cylindrical structure is such that it matches the diameter of the probe rod. The wall thickness of the cylindrical structure may be 2-8mm and the cylinder height may be 2-8 cm.
In a further embodiment, the outlet of the exhaust pipe (preferably a seamless steel pipe) connected to the sealing sleeve is higher than the opening at the narrow slot of the lower funnel structure of the sealing sleeve. The inner diameter of the exhaust pipe may be 0.5 to 2cm, but is not limited thereto.
And a circle 11 with the diameter larger than that of the outer cylinder of the sealing sleeve is arranged on the stone detecting rod above the sealing sleeve. The stone detection rod is prevented from falling into the lime kiln due to the fact that the steel wire rope at the joint of the stone detection rod is broken, and convenience is provided for equipment maintenance.
Example 1
The utility model provides a survey stone rod measuring device of material level height in lime kiln, it is including setting up the sealing sleeve 5 on the kiln crown trompil that supplies survey stone rod 2 to pass, be used for surveying survey stone rod 2 of material level height in lime kiln 1, blast pipe 4 with the kiln gas main tube connected of sealing sleeve inner chamber and lime kiln, it is seamless steel), be connected with survey stone rod 2 and be used for controlling survey stone rod to get into the wire rope 9 of lime kiln, sealing sleeve has the inner chamber, and have side opening 12 on the outer wall of one side, the one end of blast pipe 4 and sealing sleeve's side opening 12 sealing connection, the other end and the kiln gas main tube 3 sealing connection of lime kiln, hole 13 at sealing sleeve center aligns with the kiln crown trompil, survey stone rod 2 passes hole 13 at sealing sleeve center and stretches into the lime kiln via sealing sleeve inner chamber and kiln crown trompil.
The upper end of the sealing sleeve is provided with a funnel 14, a narrow groove 15 is arranged below the funnel, the shape and the size of the narrow groove are consistent with those of a stone detection rod passing through the narrow groove, the diameter of the narrow groove is slightly larger than that of the stone detection rod, the bottom depth of the narrow groove does not reach the bottom wall of the sleeve, the distance between the bottom of the narrow groove and the bottom wall of the sleeve is about 3cm, and the bottom of the narrow groove is provided with a hole 13 penetrating through the center of the sealing sleeve of the bottom wall of the sealing sleeve. The space between the opening at the slot and the opening in the bottom wall of the sleeve forms part of the entire interior cavity of the sleeve, the opening also being shaped and sized to accommodate the passage of a rock probe rod therethrough.
The sealing sleeve 5 is of cylindrical steel construction, preferably of cylindrical construction, with an outer diameter of 15cm, and the space between the walls and bottom of the funnel structure 14 and the narrow groove 15 in the lower part of the funnel structure and the outer and bottom walls of the sealing sleeve 5 is an inner cavity.
And the steel wire rope 9 is led into the bottom of the lime kiln after passing through a first fixed pulley 8 arranged on one side of the kiln top and a second fixed pulley 7 arranged at the kiln top right above the stone detecting rod in sequence. The first pulley 8 and the second pulley 7 are both fixed on the kiln top.
The steel wire rope 9 is connected with the stone detecting rod 2 through the connecting device 6, the connecting device 6 is of a steel cylindrical structure with a closed top end and an open bottom end, a round hole for the steel wire rope to pass through and preventing the knotted steel wire rope from coming off is formed in the top of the steel cylindrical structure, and an internal thread matched with the external thread of the stone detecting rod is arranged on the lower portion of the steel cylindrical structure. The inner diameter of the cylindrical structure is such that it matches the diameter of the probe rod. The wall thickness of the cylindrical structure is about 3mm and the cylinder height is 5 cm.
During operation, operating personnel hangs down pulling wire rope 9 at 1 kiln of lime kiln, and after wire rope 9 lifted the spy stone pole 2 through first pulley 8 and second pulley 7, operating personnel loosed one's hand, spy the free falling body motion of stone pole 2 to the stone layer 10, through the stone layer scale that marks on the kiln body, measure corresponding lime kiln stone layer numerical value. Because the negative pressure is constantly kept in the kiln gas main pipe, after the sealing sleeve 5 is connected with the kiln gas main pipe 3 through the seamless steel pipe 4, the kiln gas overflowing from the gap between the sounding stone 2 and the hole opened in the kiln top is sucked into the kiln gas main pipe 3 through the seamless steel pipe 4, and the kiln gas is prevented from leaking.
The present invention has been described above by way of example, but the above description does not constitute any limitation of the present invention. It will be apparent to those skilled in the art that various modifications or changes may be made to the present invention without departing from the spirit and scope of the invention, and these modifications or changes should be construed to be within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a survey stone rod measuring device of material level height in lime kiln, it is including setting up the sealed sleeve on the kiln crown trompil that supplies the survey stone rod to pass, a survey stone rod for survey stone level height in the lime kiln, the blast pipe of being connected the kiln gas main pipe of sealed sleeve inner chamber and lime kiln, be connected with survey stone rod and be used for controlling the wire rope that surveys stone rod and get into the lime kiln, sealed sleeve has the inner chamber, and have the side opening on the outer wall of one side, the one end and the side opening of sealed sleeve of blast pipe are connected, the other end is connected with the kiln gas main pipe of lime kiln, the hole at sealed sleeve center aligns with the kiln crown trompil, the hole that surveys stone rod and passes sealed sleeve center stretches into the lime kiln via sealed sleeve inner chamber and kiln crown trompil.
2. The rock shaft measuring device of claim 1, wherein the upper end of the sealing sleeve is provided with a funnel, the lower part of the funnel is provided with a narrow groove, the bottom depth of the narrow groove does not reach as far as the bottom wall of the sleeve, and the bottom of the narrow groove is provided with a hole penetrating the center of the sealing sleeve on the bottom wall of the sealing sleeve.
3. The rock rod measurement apparatus of claim 2, wherein the sealing sleeve is cylindrical, square or other polygonal configuration.
4. The stone detecting rod measuring device as claimed in claim 1, wherein the steel wire rope is introduced to the bottom of the lime kiln after passing through a first pulley arranged on one side of the kiln top and a second pulley arranged at the kiln top right above the stone detecting rod in sequence.
5. The rock detection rod measuring device of claim 1, wherein the steel wire rope is connected with the rock detection rod through a connecting device, the connecting device is of a cylindrical structure with a closed top end and an open bottom end, a round hole for the steel wire rope to pass through and preventing the knotted steel wire rope from falling off is formed in the top of the connecting device, and an internal thread matched with the external thread of the rock detection rod is formed in the lower portion of the connecting device.
6. The rock shaft measuring device of claim 1, wherein the outlet of the vent pipe connected to the sealing sleeve is higher than the opening of the sealing sleeve at the narrow groove of the funnel structure lower part.
7. The apparatus according to claim 1, wherein the stone detecting rod above the sealing sleeve is provided with a circle having a diameter larger than that of the outer cylinder of the sealing sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010220134.XA CN113446866B (en) | 2020-03-25 | 2020-03-25 | Measure stone detection rod measuring device of material level height in limekiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010220134.XA CN113446866B (en) | 2020-03-25 | 2020-03-25 | Measure stone detection rod measuring device of material level height in limekiln |
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| Publication Number | Publication Date |
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| CN113446866A true CN113446866A (en) | 2021-09-28 |
| CN113446866B CN113446866B (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010220134.XA Active CN113446866B (en) | 2020-03-25 | 2020-03-25 | Measure stone detection rod measuring device of material level height in limekiln |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240858A (en) * | 2015-11-03 | 2016-01-13 | 大连华锐重工集团股份有限公司 | Material level detection device of small garbage incinerator |
| CN205483161U (en) * | 2016-03-21 | 2016-08-17 | 安阳化学工业集团有限责任公司 | Feed bin material level automatic measuring device |
| CN208254601U (en) * | 2018-04-28 | 2018-12-18 | 四川南联环资科技股份有限公司 | A kind of simple quartz tail sand bin-level device |
| CN109058458A (en) * | 2018-10-31 | 2018-12-21 | 厦工(三明)重型机器有限公司 | A kind of chemical converter feeding seal structure |
-
2020
- 2020-03-25 CN CN202010220134.XA patent/CN113446866B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240858A (en) * | 2015-11-03 | 2016-01-13 | 大连华锐重工集团股份有限公司 | Material level detection device of small garbage incinerator |
| CN205483161U (en) * | 2016-03-21 | 2016-08-17 | 安阳化学工业集团有限责任公司 | Feed bin material level automatic measuring device |
| CN208254601U (en) * | 2018-04-28 | 2018-12-18 | 四川南联环资科技股份有限公司 | A kind of simple quartz tail sand bin-level device |
| CN109058458A (en) * | 2018-10-31 | 2018-12-21 | 厦工(三明)重型机器有限公司 | A kind of chemical converter feeding seal structure |
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| CN113446866B (en) | 2023-02-24 |
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