CN112323714A - Winter temporary anti-icing measure for inverted T-shaped dock gate - Google Patents
Winter temporary anti-icing measure for inverted T-shaped dock gate Download PDFInfo
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- CN112323714A CN112323714A CN202011070142.7A CN202011070142A CN112323714A CN 112323714 A CN112323714 A CN 112323714A CN 202011070142 A CN202011070142 A CN 202011070142A CN 112323714 A CN112323714 A CN 112323714A
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- air
- dock gate
- inverted
- winter
- icing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
- E02B1/003—Mechanically induced gas or liquid streams in seas, lakes or water-courses for forming weirs or breakwaters; making or keeping water surfaces free from ice, aerating or circulating water, e.g. screens of air-bubbles against sludge formation or salt water entry, pump-assisted water circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C1/00—Dry-docking of vessels or flying-boats
- B63C1/02—Floating docks
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02C—SHIP-LIFTING DEVICES OR MECHANISMS
- E02C1/00—Locks or dry-docks; Shaft locks, i.e. locks of which one front side is formed by a solid wall with an opening in the lower part through which the ships pass
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Cleaning In General (AREA)
Abstract
The invention relates to the technical field of dock gate engineering, in particular to a winter temporary anti-icing measure for an inverted T-shaped dock gate, compressed air is released into water by a bubble generator through an air injection device, and strong turbulent water flow is formed by disturbing a water body by utilizing bubbles, so that the water surface in a certain range away from the upstream surface of the dock gate is prevented from being frozen; when the temperature of the seawater is changed in winter, the driving assembly is controlled by the master control button to drive the moving block to move on the moving track, and the anti-icing device on the moving block is adjusted to be below the level of the seawater, so that the bubble generator is positioned at different water level heights; the distance between the bubble generating device and the dock gate is adjusted through the electric telescopic rod, and the anti-icing area is adaptively adjusted; compressed air discharged by the air compressor enters the air storage tank, the air storage tank is used for balancing system pressure and reducing frequent loading and unloading of the air compressor, and the compressed air can be cooled again to reduce the content of moisture in the compressed air.
Description
Technical Field
The invention relates to the technical field of dock gate engineering, in particular to a winter temporary anti-icing measure for an inverted T-shaped dock gate.
Background
The phenomenon of water freezing in many cases in engineering affects production efficiency and even jeopardizes equipment safety. Most dock gates are in contact with seawater, for a severe cold area, when the temperature of part of the dock gates is lower than the freezing point in winter, the dock gates are frozen by sea ice, the opening and closing of the dock gates are influenced, and therefore the work is influenced, and when the dock gates are closed, the water level in the ballast water tank and the external sea level are in a basically synchronous leveling state. Meanwhile, the outer wall of the dock gate on one side in the dock is directly contacted with cold air, so that the risk of freezing seawater in the water tank can be caused. The dock gate is generally made of steel, the heat conductivity coefficient of the dock gate is extremely high and can reach 53kW/(m DEG C) at 0 ℃, and the heat transfer coefficient of the dock gate can reach 331 if the thickness of the dock gate is considered according to 16mm3W/(m2Deg.c). The extremely high heat transfer coefficient makes the heat inside the water tank easily dissipated to the surrounding air and seawater, so that the possibility of freezing exists.
Chemical agents cannot be used for melting ice due to environmental requirements. The method provides strict requirements for ice load resistance of the dock gate structure, ice and freezing prevention of the exterior of the dock gate and a water stop area, ice prevention of a water tank, internal heating and the like, and some ice prevention measures are required for ensuring that the dock gate can normally run in winter.
Disclosure of Invention
The invention aims to provide a winter temporary anti-icing measure for an inverted T-shaped dock gate, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a temporary anti-icing measure for an inverted T-shaped dock gate in winter is characterized in that compressed air is released into water from a bubble generator through an air injection device, and bubbles are used for disturbing a water body to form strong turbulent water flow, so that the water surface in a certain range away from the upstream surface of the dock gate is prevented from being frozen; the air injection device comprises a moving track, an air storage tank and an air bubble generator; two parallel moving tracks are arranged on the outer side of the dock gate, the two moving tracks are vertically fixed on the edges of two sides of the dock gate, and a plurality of corresponding moving blocks are arranged on the moving tracks; the side edge of the moving block is provided with an external driving assembly, the moving block is connected with a fixed cross rod, and the front end of the fixed cross rod is provided with a plurality of fixed seats; the front end of the fixed seat is provided with an electric telescopic rod, the front end of the electric telescopic rod is provided with an installation fulcrum shaft, and the tail end of the installation fulcrum shaft is provided with an installation seat; an air compressor is arranged on the fixed cross rod, an air compression pipeline is connected to the output end of the air compressor, and the tail end of the air compression pipeline is connected to an air storage tank; an air outlet port is formed in the air storage tank, a filter is connected to the air outlet port, and the output end of the filter is connected to the air supply main pipe; the air supply main pipe is provided with a plurality of air supply ports, the air supply ports are connected with elastic air supply pipelines, the tail ends of the elastic air supply pipelines are connected to the bubble generator, and the bubble generator is fixed on the mounting seat; the output end of the bubble generator is connected with an air outlet guide pipe, the air outlet guide pipe is vertically arranged, and a plurality of bubble ports which are uniformly distributed are arranged on the air outlet guide pipe.
Preferably, a plurality of pairs of moving blocks are correspondingly arranged on the moving track, driving assemblies are respectively arranged on the moving blocks, fixed cross rods are connected to the corresponding moving blocks, and height sensors are arranged on the fixed cross rods.
Preferably, the driving assembly comprises a lifting motor and a driving support shaft, the lifting motor is fixed on the side edge of the moving track, the output end of the lifting motor is connected with a lifting support rod, the tail end of the lifting support rod is provided with a connecting support rod which is vertically connected, and the tail end of the connecting support rod is connected to the side edge of the moving block.
Preferably, the elastic air supply pipeline is a compressible pipeline with elasticity, and the maximum length of the elastic air supply pipeline corresponds to the maximum length of the electric telescopic rod.
Preferably, the electric telescopic rod is perpendicular to the mounting fulcrum, and the height of the mounting seat is lower than that of the fixed seat.
Preferably, the bubble generators arranged on the mounting seats at different positions and heights have different powers and different bubble diameters.
Preferably, the air compressor machine side is provided with reserve air compressor machine, and reserve air compressor machine output is connected to the gas holder equally, and reserve air compressor machine output is provided with the pneumatic control valve of reserve.
Preferably, the gas supply main pipe is parallel to the fixed cross rod, the gas supply main pipe is fixed on the side edge of the fixed cross rod, and the distribution positions of the gas supply ports correspond to the fixed seats one to one.
Preferably, the air compression pipeline is provided with a pressure sensor and a pressure gauge, and the tail end of the air compression pipeline is provided with an electromagnetic switch valve.
Compared with the prior art, the invention has the beneficial effects that: when the temperature of the seawater is changed in winter, the driving assembly is controlled by the master control button to drive the moving block to move on the moving track, and the anti-icing device on the moving block is adjusted to be below the level of the seawater, so that the bubble generator is positioned at different water level heights; the distance between the bubble generating device and the dock gate is adjusted through the electric telescopic rod, and the anti-icing area is adaptively adjusted; compressed air discharged by the air compressor enters the air storage tank, the air storage tank is used for balancing system pressure and reducing frequent loading and unloading of the air compressor, and the compressed air can be cooled again to reduce the content of moisture in the compressed air; compressed air is released into water through the bubble generator, and strong turbulent water flow is formed by disturbing a water body through bubbles, so that the water surface in a certain range away from the upstream surface of the dock gate is prevented from being frozen.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic side view of the present invention.
In the figure: 1. a dock gate; 2. a moving track; 3. a moving block; 4. fixing the cross bar; 5. a fixed seat; 6. an electric telescopic rod; 7. mounting a fulcrum; 8. a mounting seat; 9. an air compressor; 10. an air compression conduit; 11. a gas storage tank; 12. an air outlet port; 13. a filter; 14. a main gas supply pipe; 15. an elastic gas supply duct; 16. a bubble generator; 17. an air outlet duct; 18. a bubble port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-2, the present invention provides a technical solution: a temporary anti-icing measure for an inverted T-shaped dock gate in winter is characterized in that compressed air is released into water from a bubble generator through an air injection device, and bubbles are used for disturbing a water body to form strong turbulent water flow, so that the water surface in a certain range away from the upstream surface of the dock gate 1 is prevented from being iced; the air injection device comprises a moving track 2, an air storage tank and an air bubble generator 16; two parallel moving tracks 2 are arranged on the outer side of the dock gate 1, the two moving tracks 2 are vertically fixed on the edges of two sides of the dock gate 1, and a plurality of corresponding moving blocks 3 are arranged on the moving tracks 2; an external driving assembly is arranged on the side edge of the moving block 3, a fixed cross rod 4 is connected to the moving block 3, and a plurality of fixed seats 5 are arranged at the front end of the fixed cross rod 4; an electric telescopic rod 6 is arranged at the front end of the fixed seat 5, an installation fulcrum shaft 7 is arranged at the front end of the electric telescopic rod 6, and an installation seat 8 is arranged at the tail end of the installation fulcrum shaft 7; an air compressor 9 is arranged on the fixed cross rod 4, the output end of the air compressor 9 is connected with an air compression pipeline 10, and the tail end of the air compression pipeline 10 is connected to an air storage tank 11; an air outlet port 12 is formed in the air storage tank 11, a filter 13 is connected to the air outlet port 12, and the output end of the filter 13 is connected to an air supply main pipe 14; the air supply main pipe 14 is provided with a plurality of air supply ports, the air supply ports are connected with elastic air supply pipelines 15, the tail ends of the elastic air supply pipelines 15 are connected to bubble generators 16, and the bubble generators 16 are fixed on the mounting base 8; the output end of the bubble generator 16 is connected with an air outlet guide pipe 17, the air outlet guide pipe 17 is vertically arranged, and a plurality of bubble ports 18 which are uniformly distributed are arranged on the air outlet guide pipe 17.
Furthermore, a plurality of pairs of moving blocks 3 are correspondingly arranged on the moving track 2, driving components are respectively arranged on the moving blocks 3, fixed cross rods 4 are connected to the corresponding moving blocks 3, and height sensors are arranged on the fixed cross rods 4.
Further, drive assembly includes elevator motor and drive fulcrum, and elevator motor fixes at 2 sides of removal track, and the elevator motor output is connected with lift branch, and lift branch end is provided with the connecting support rod of perpendicular connection, and connecting support rod end-to-end connection is to the movable block 3 side.
Further, the elastic air supply pipeline 15 is a compressible pipeline with elasticity, and the maximum length of the elastic air supply pipeline 15 corresponds to the maximum length of the electric telescopic rod 6.
Furthermore, the electric telescopic rod 6 is perpendicular to the mounting fulcrum 7, and the height of the mounting seat 8 is lower than that of the fixed seat 5.
Further, the bubble generators 16 arranged on the mounting seats 8 at different positions and heights have different powers and different bubble diameters.
Further, 9 sides of air compressor machine are provided with reserve air compressor machine, and reserve air compressor machine output is connected to gas holder 11 equally, and reserve air compressor machine output is provided with the pneumatic control valve that stands by.
Further, the gas supply main pipe 14 is parallel to the fixed cross rod 4, the gas supply main pipe 14 is fixed on the side of the fixed cross rod 4, and the distribution positions of the gas supply ports correspond to the fixed seats 5 one to one.
Further, a pressure sensor and a pressure gauge are arranged on the air compression pipeline 10, and an electromagnetic switch valve is arranged at the tail end of the air compression pipeline 10.
The working principle is as follows: two parallel moving tracks 2 are arranged on the outer side of the dock gate 1, the two moving tracks 2 are vertically fixed on the edges of two sides of the dock gate 1, and a plurality of corresponding moving blocks 3 are arranged on the moving tracks 2; an external driving assembly is arranged on the side edge of the moving block 3, a fixed cross rod 4 is connected to the moving block 3, and a plurality of fixed seats 5 are arranged at the front end of the fixed cross rod 4; when the winter comes, according to the temperature change of the seawater, the driving assembly is controlled by the master control button to drive the moving block 3 to move on the moving track 2, and the anti-icing device on the moving block 3 is adjusted to be below the level of the seawater, so that the bubble generator 16 is positioned at different water level heights;
an electric telescopic rod 6 is arranged at the front end of the fixed seat 5, an installation fulcrum shaft 7 is arranged at the front end of the electric telescopic rod 6, and an installation seat 8 is arranged at the tail end of the installation fulcrum shaft 7; an air compressor 9 is arranged on the fixed cross rod 4, the output end of the air compressor 9 is connected with an air compression pipeline 10, and the tail end of the air compression pipeline 10 is connected to an air storage tank 11; an air outlet port 12 is formed in the air storage tank 11, a filter 13 is connected to the air outlet port 12, and the output end of the filter 13 is connected to an air supply main pipe 14; the distance between the bubble generating device and the dock gate is adjusted through the electric telescopic rod 6, and the anti-icing area is adaptively adjusted;
the air supply main pipe 14 is provided with a plurality of air supply ports, the air supply ports are connected with elastic air supply pipelines 15, the tail ends of the elastic air supply pipelines 15 are connected to bubble generators 16, and the bubble generators 16 are fixed on the mounting base 8; the output end of the bubble generator 16 is connected with an air outlet guide pipe 17, the air outlet guide pipe 17 is vertically arranged, and a plurality of bubble ports 18 which are uniformly distributed are arranged on the air outlet guide pipe 17; compressed air discharged by the air compressor 9 enters the air storage tank 11, the air storage tank 11 is used for balancing system pressure and reducing frequent loading and unloading of the air compressor, and the compressed air can be cooled again to reduce the content of moisture in the compressed air; the filter 13 can filter out impurities such as moisture, oil and dust with large particles in the compressed air, so that the air entering the air supply main pipe 14 is relatively clean, the pressure sensor and the pressure gauge are arranged on the main pipeline in the air compressor 9 house, the pressure condition in the pipeline can be monitored in real time, the electromagnetic switch valve is arranged on the air compression pipeline 10 to automatically control the on-off of the air supply pipeline 14, the compressed air is released into the water through the bubble generator 16, the bubbles are used for disturbing the water body to form strong turbulent water flow, and the water surface in a certain range away from the upstream surface of the dock gate is ensured not to be frozen.
It is worth noting that: the whole device realizes control over the device through the master control button, and the device matched with the control button is common equipment, belongs to the existing mature technology, and is not repeated for the electrical connection relation and the specific circuit structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a temporary anti-icing measure in type of falling T dock gate winter which characterized in that: compressed air is released into water from the bubble generator through the air injection device, and strong turbulent water flow is formed by disturbing a water body through bubbles, so that the water surface in a certain range away from the upstream surface of the dock gate (1) is prevented from being frozen; the air injection device comprises a moving track (2), an air storage tank and an air bubble generator (16); two parallel moving tracks (2) are arranged on the outer side of the dock gate (1), the two moving tracks (2) are vertically fixed on the edges of two sides of the dock gate (1), and a plurality of corresponding moving blocks (3) are arranged on the moving tracks (2); the lateral side of the moving block (3) is provided with an external driving component, the moving block (3) is connected with a fixed cross rod (4), and the front end of the fixed cross rod (4) is provided with a plurality of fixed seats (5); an electric telescopic rod (6) is arranged at the front end of the fixed seat (5), an installation fulcrum shaft (7) is arranged at the front end of the electric telescopic rod (6), and an installation seat (8) is arranged at the tail end of the installation fulcrum shaft (7); an air compressor (9) is arranged on the fixed cross rod (4), the output end of the air compressor (9) is connected with an air compression pipeline (10), and the tail end of the air compression pipeline (10) is connected to an air storage tank (11); an air outlet port (12) is formed in the air storage tank (11), a filter (13) is connected to the air outlet port (12), and the output end of the filter (13) is connected to an air supply main pipe (14); the air supply main pipe (14) is provided with a plurality of air supply ports, the air supply ports are connected with elastic air supply pipelines (15), the tail ends of the elastic air supply pipelines (15) are connected to bubble generators (16), and the bubble generators (16) are fixed on the mounting base (8); the output end of the bubble generator (16) is connected with an air outlet guide pipe (17), the air outlet guide pipe (17) is vertically arranged, and a plurality of bubble ports (18) which are uniformly distributed are arranged on the air outlet guide pipe (17).
2. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the movable track (2) is correspondingly provided with a plurality of pairs of movable blocks (3), the movable blocks (3) are respectively provided with a driving assembly, the corresponding movable blocks (3) are connected with fixed cross rods (4), and the fixed cross rods (4) are provided with height sensors.
3. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the driving assembly comprises a lifting motor and a driving support shaft, the lifting motor is fixed to the side edge of the moving track (2), the output end of the lifting motor is connected with a lifting support rod, the tail end of the lifting support rod is provided with a connecting support rod which is vertically connected, and the tail end of the connecting support rod is connected to the side edge of the moving block (3).
4. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the elastic air supply pipeline (15) is a compressible pipeline with elasticity, and the maximum length of the elastic air supply pipeline (15) corresponds to the maximum length of the electric telescopic rod (6).
5. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the electric telescopic rod (6) is perpendicular to the mounting fulcrum shaft (7), and the height of the mounting seat (8) is lower than that of the fixing seat (5).
6. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the bubble generators (16) arranged on the mounting seats (8) at different positions and heights have different powers and different bubble diameters.
7. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the side of the air compressor (9) is provided with a standby air compressor, the output end of the standby air compressor is also connected to the air storage tank (11), and the output end of the standby air compressor is provided with a standby air control valve.
8. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the gas supply main pipe (14) is parallel to the fixed cross rod (4), the gas supply main pipe (14) is fixed on the side of the fixed cross rod (4), and the distribution positions of the gas supply ports correspond to the fixing seats (5) one by one.
9. The inverted-T dock gate winter temporary anti-icing measure of claim 1, wherein: the air compression pipeline (10) is provided with a pressure sensor and a pressure gauge, and the tail end of the air compression pipeline (10) is provided with an electromagnetic switch valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070142.7A CN112323714A (en) | 2020-09-30 | 2020-09-30 | Winter temporary anti-icing measure for inverted T-shaped dock gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070142.7A CN112323714A (en) | 2020-09-30 | 2020-09-30 | Winter temporary anti-icing measure for inverted T-shaped dock gate |
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| Publication Number | Publication Date |
|---|---|
| CN112323714A true CN112323714A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011070142.7A Pending CN112323714A (en) | 2020-09-30 | 2020-09-30 | Winter temporary anti-icing measure for inverted T-shaped dock gate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2805854C1 (en) * | 2023-04-27 | 2023-10-24 | Виктор Владимирович Котмин | Device for protecting floating dock from broken ice |
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| US3831385A (en) * | 1972-06-26 | 1974-08-27 | Chevron Res | Arctic offshore platform |
| CN108166469A (en) * | 2018-01-30 | 2018-06-15 | 长春华普大通防冰工程技术有限公司 | Hydraulic and hydroelectric engineering anti-icing system |
| CN109403275A (en) * | 2018-06-21 | 2019-03-01 | 长春华普大通防冰工程技术有限公司 | Anti-icing system, anti-icing control method and computer readable storage medium |
| CN110416955A (en) * | 2019-09-03 | 2019-11-05 | 东莞市凯勒帝数控科技有限公司 | A kind of deicer of power transmission line and overhead insulation |
| CN110565575A (en) * | 2019-09-10 | 2019-12-13 | 清华大学 | anti ice-pulling device of high and cold district dam intelligence |
| CN110924362A (en) * | 2019-11-21 | 2020-03-27 | 华北水利水电大学 | Be applied to energy-efficient anti-icing gate of channel |
-
2020
- 2020-09-30 CN CN202011070142.7A patent/CN112323714A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3831385A (en) * | 1972-06-26 | 1974-08-27 | Chevron Res | Arctic offshore platform |
| CN108166469A (en) * | 2018-01-30 | 2018-06-15 | 长春华普大通防冰工程技术有限公司 | Hydraulic and hydroelectric engineering anti-icing system |
| CN109403275A (en) * | 2018-06-21 | 2019-03-01 | 长春华普大通防冰工程技术有限公司 | Anti-icing system, anti-icing control method and computer readable storage medium |
| CN110416955A (en) * | 2019-09-03 | 2019-11-05 | 东莞市凯勒帝数控科技有限公司 | A kind of deicer of power transmission line and overhead insulation |
| CN110565575A (en) * | 2019-09-10 | 2019-12-13 | 清华大学 | anti ice-pulling device of high and cold district dam intelligence |
| CN110924362A (en) * | 2019-11-21 | 2020-03-27 | 华北水利水电大学 | Be applied to energy-efficient anti-icing gate of channel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2805854C1 (en) * | 2023-04-27 | 2023-10-24 | Виктор Владимирович Котмин | Device for protecting floating dock from broken ice |
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Application publication date: 20210205 |