A device for removing bottom oil

Abstract

The present invention discloses a bottom oil removal device, comprising: at least one module and at least one floating positioning device; the module comprises: a bracket and an adsorbent cotton sheet; the adsorbent cotton sheet is located in the bracket and connected to the bracket; adjacent brackets are interconnected so that a plurality of modules extend in the horizontal direction; the floating positioning device is installed in the bracket. The bottom oil removal device provided by the present invention has low technical requirements for operation, is less restricted by adverse sea conditions, has little impact on the marine environment (seabed, channel water depth, etc.), has strong pertinence for the removal of scattered small areas of bottom oil, has a large oil absorption area, has a stronger ability to capture bottom oil, and has a stronger adhesion.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a bottom oil removal device. Background Art

[0002] With the rapid development of the economy and society, my country's energy demand and crude oil imports have been rising year by year. Ship traffic accidents, pipeline leakage of submarine and coastal oil storage facilities, leakage of drilling platforms or salvage of sunken ships may all cause oil spill accidents. After oil leaks into the sea, its density may change due to the natural environment and human intervention, and it may be suspended in the seawater or sink to the seabed (it will re-suspend when disturbed), forming submerged oil. Submerged oil is common in shallow seas, especially semi-enclosed bays.

[0003] Submersible oil includes semi-submersible oil and bottom oil. Among them, oil suspended in seawater and drifting with the water flow is called semi-submersible oil. Semi-submersible oil will float to the surface of the water or sink to the bottom of the sea to become bottom oil as the natural environment such as seawater temperature and salinity changes. Bottom oil mostly exists in the form of liquid or semi-solid tar balls. The bottom of shallow sea water is greatly affected by the water flow. Under the action of the water flow, the bottom oil will be turned up again to become semi-submersible oil or washed ashore by the water flow, causing repeated pollution to the marine environment and nearshore environment. And because of its unknown source, difficulty in detection and tracking, it is difficult to capture and dispose of it, which has become a new problem in pollution prevention and management supervision. This has not only seriously affected the development of coastal economy such as tourism and aquaculture, but also caused adverse social impacts.

[0004] However, the theoretical basis of ordinary surface oil spills and monitoring, simulation, containment and recovery systems are all inoperable for bottom oil. In addition, the low underwater temperature and visibility make the disposal of bottom oil extremely complicated and difficult. At present, there are three main methods for the recovery and disposal of bottom oil. The first is manual collection by divers. This method requires divers to directly contact the oil pollution, which requires high professionalism and is dangerous. It is inefficient and has no practical reports. The second is ship towing cables, which are suitable for shallow seas. The scraping of the seabed and the disturbance of the water body will cause damage to a large area of ​​the seabed ecosystem. The towing cable has a small oil absorption area, low oil pollution removal efficiency, incomplete removal, and will sweep the oil pollution to other seabed areas or cause the bottom oil to float up again to form semi-submersible oil, expanding the pollution area. In addition, this method requires a high degree of cooperation between the ship and the operator, and the cost and professionalism of the operator are high. In addition, this method will affect the channel conditions and is not suitable for busy sea areas. The third is the pumping system, which can be used in deeper waters and basically does not require divers to have direct contact with the oil. However, this method is expensive and requires high professionalism from the operators. The indiscriminate suction of the oil and bottom sediment on the seabed will damage the seabed ecosystem and navigation conditions. The large amount of oil-water mixture recovered by the pumping system will greatly increase the subsequent pollutant disposal work and costs of the clean-up operation. The pumping system is suitable for large-scale seabed oil pollution (overall, large amount of oil pollution, large polluted area) or large-scale concentrated seabed oil pollution (multiple small-scale oil pollution, not far from each other).

[0005] Therefore, it is a technical problem that technical personnel in this field urgently need to solve to provide a bottom oil removal device that is easy to operate, has low technical requirements, a wide range of applications, and little impact on operations. Summary of the invention

[0006] The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

[0007] To this end, an object of the present invention is to provide a bottom oil removal device, comprising: at least one module and at least one floating positioning device;

[0008] The module comprises: a bracket and an adsorption cotton sheet; the adsorption cotton sheet is located in the bracket and connected to the bracket;

[0009] Adjacent brackets are connected to each other so that a plurality of modules extend in a horizontal direction;

[0010] The floating positioning device is installed in the bracket.

[0011] The beneficial effects of adopting the above technical solution are as follows: after years of water scouring and migration, the bottom oil is widely distributed on the seabed, and the oil pollution area is small and dispersed. These sea areas are also dotted with busy ports and shipping routes, or are close to bathing beaches, aquaculture areas and other areas with high environmental sensitivity, so they are not suitable for long-term operations and major interference and damage to the underwater geology. The present invention realizes the automatic floating and positioning of the cleaning device by setting a floating positioning device, without the need for ships and personnel to follow, and without the need for towing, and has little impact on the marine environment (seabed sediments, channel water depth, etc.), and the sea surface operation time is short, which hardly affects the normal development of shipping and marine aquaculture.

[0012] At the same time, the absorbent cotton sheet installed in the bracket can achieve efficient absorption of the bottom oil. The absorbent cotton sheet used in the present invention is oleophilic and hydrophobic, can adhere to semi-solid tar balls and liquid oil pollution, and the oil absorption rate is above 90%. Since the traditional pumping and scraping mode is not adopted, the water body and the deposited oil on the seabed will not be disturbed, causing further spread of the oil pollution.

[0013] According to the area, shape and seabed topography of the bottom oil to be cleaned, different numbers of modules can be designed for assembly and connection to increase the contact area between the cleaning device and the bottom oil. When there is only one module, the floating positioning device is installed in the module; when there are multiple modules, the floating positioning device can be installed in any one or more modules according to the calculation of buoyancy. The module without the floating positioning device is driven by the module equipped with the floating positioning device to float.

[0014] Preferably, the floating positioning device is located at an edge or corner position in the bracket; when there are multiple modules, the floating positioning device is preferably installed in the modules at the corner positions.

[0015] Preferably, the floating positioning device is welded to the bracket.

[0016] The floating positioning device is centrally installed in the module at the corner position, so that the bottom oil removal device can be tilted when floating to form a sharp corner, thereby reducing water resistance.

[0017] Preferably, the floating positioning device comprises: an air bag, a control valve, an inflation device, a control line, a timing device, a positioning device and a housing;

[0018] The housing comprises a sealing chamber and an airbag chamber, and the top and bottom ends of the airbag chamber are both provided with flip covers; the sealing chamber and / or the airbag chamber are connected to the bracket;

[0019] The control valve, the inflation device, the control line, the timing device, and the positioning device are all fixed in the sealed chamber; the airbag is fixed in the airbag chamber, and the top and bottom ends correspond to the flip cover positions;

[0020] The airbag is connected to the control valve, the control line, and the timing device in sequence; the control valve is also connected to the inflation device;

[0021] The positioning device collects positioning information and transmits the information to the mobile terminal.

[0022] The beneficial effects of the above technical solution are as follows: the airbag is tightly connected to the control valve, and when the airbag is inflated, it automatically pushes open the upper and lower flip covers of the shell through volume expansion, driving the entire device to float to the surface of the water. The positioning device sends back a coordinate signal every 2 minutes, which can be received by computer software or a dedicated app for mobile phones / pads and displayed on a map or chart.

[0023] Preferably, the airbag is a circular folding airbag; the inflation device is a gas cylinder; the timing device is a timer;

[0024] The sealed chamber is divided into an inflation chamber, a timing chamber and a positioning chamber; the inflation chamber is provided with an inflation device slot and a control line slot for fixing the inflation device and the control line.

[0025] The positioning device can also be waterproof and sealed separately. The inflation device, control line and timing device are waterproof and sealed.

[0026] Preferably, the support comprises: a frame and a semicircular ring 1;

[0027] The semicircular ring 1 is fixedly connected to the inner side of the frame;

[0028] The frame is provided with the adsorption cotton sheet, and the adsorption cotton sheet is connected to the semicircular ring;

[0029] The sealing chamber and / or the airbag chamber are connected to the frame.

[0030] The frame is the outer frame of the module, which is painted with marine anti-rust paint. The size is set according to the needs, for example: 1m long, 70cm wide, and 2-10cm high.

[0031] Preferably, the frame body comprises: a frame, horizontal bars and vertical bars; the horizontal bars and the vertical bars are fixed on the inner side of the frame in a square grid manner;

[0032] The adsorption cotton sheet is installed on the frame;

[0033] The sealing chamber and / or the airbag chamber are connected to the frame.

[0034] The horizontal bar can be cylindrical, with an inner diameter of 5-10mm, hollow or solid; the vertical bar can also be cylindrical, with an inner diameter of 5-10mm, hollow or solid. The horizontal bar and the vertical bar can be made into a grid, or can be independently layered and fixed on the frame.

[0035] Preferably, the semicircular ring, the horizontal bars and the vertical bars are welded to the bracket.

[0036] Preferably, a circular hole is provided on the adsorbent cotton sheet, and the circular hole is connected to the semicircular ring.

[0037] Furthermore, the frame is rectangular, the adsorption cotton sheet is a rectangular felt sheet with round holes at four corners, and the round holes are connected to the semicircular rings through rust-proof horseshoe locks or self-locking plastic cable ties.

[0038] Preferably, adsorption cotton sheets are installed between adjacent vertical bars and between the vertical bars and the frame, and the installation positions of the multiple semicircular rings are consistent with the circular holes of the adsorption cotton sheets.

[0039] Preferably, the adsorption cotton sheets are in a wave-like shape and go around the horizontal bars in sequence up and down, and the directions in which adjacent adsorption cotton sheets go around the same horizontal bar are opposite.

[0040] Preferably, a semicircular ring 2 is provided on the shell;

[0041] The adsorption cotton sheet comprises: an adsorption cotton sheet 1 and an adsorption cotton sheet 2; both ends of the adsorption cotton sheet 1 are connected to the semicircular ring 1;

[0042] One end of the second adsorption cotton sheet is connected to the first semicircular ring, and the other end is connected to the second semicircular ring.

[0043] The adsorption cotton sheet is provided with two specifications, one long and one short, with the same width, and can be installed according to needs. The adsorption cotton sheet one is suitable for the position where the floating positioning device is not installed, and the adsorption cotton sheet two is suitable for the position where the floating positioning device is installed. The adsorption cotton sheet of the present invention is detachable and easy to install.

[0044] Preferably, it also includes a semicircular ring three; the semicircular ring three is connected to the outer wall of the frame, and the adjacent frames are connected through the semicircular ring three.

[0045] The semicircular rings are distributed at positions close to the top corners of the frame.

[0046] Preferably, it also includes a plurality of module connecting devices; the semicircular rings three between the adjacent frames are connected by the module connecting devices.

[0047] Preferably, the module connection device comprises: 2 rust-proof horseshoe locks and a rust-proof iron chain,

[0048] The rust-proof horseshoe lock is connected with a semicircular ring four; the two ends of the rust-proof iron chain are respectively connected with the rust-proof horseshoe lock through the semicircular ring four; the semicircular rings three between the adjacent frames are respectively connected with one of the rust-proof horseshoe locks.

[0049] The beneficial effects of using the above module connection device are:

[0050] (1) It is convenient to assemble and can be operated with one hand, so one person can complete the assembly and disassembly work;

[0051] (2) Standardized parts make assembly easier to understand and use, and production is also easier;

[0052] (3) A small section of chain is added in the middle. The adjacent modules connected may be bent at a certain angle due to factors such as transportation, water flow, and placement. This design can reduce the force on the frame and the connecting device during bending and reduce the probability of damage during use.

[0053] (4) The seabed is uneven, so the finished product can better fit the seabed terrain.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] (1) Low production and operation costs, the main parts can be reused, and the cost of consumables is low. It can be put into production in a large-scale and standardized manner, and the accessories are common and domestically produced;

[0056] (2) Low technical requirements for operation, easy operation, greatly reducing labor costs;

[0057] (3) It is less restricted by adverse sea conditions and can be recovered at sea when the sea conditions improve. Adverse sea conditions will not affect its effectiveness.

[0058] (4) The impact on the marine environment (seabed, channel depth, etc.) is small, the sea surface operation time is short, and it hardly affects the normal development of shipping and marine aquaculture;

[0059] (5) It is highly targeted in clearing small areas of scattered oil. It has a large oil suction area, a stronger ability to capture oil and a stronger adhesion. It is more advanced than the towing cable and more economical than the pump suction system. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0061] Figure 1 The accompanying drawing is a schematic diagram of the module structure of the floating positioning device provided by the present invention;

[0062] Figure 2 The accompanying drawing is a schematic diagram of the module structure without the floating positioning device provided by the present invention;

[0063] Figure 3 The accompanying drawing is a schematic structural diagram of the adsorption cotton sheet provided by the present invention;

[0064] Figure 4 The accompanying drawing is a schematic structural diagram of the floating positioning device provided by the present invention;

[0065] Figure 5 The accompanying drawing is a schematic structural diagram of a module connection device provided by the present invention;

[0066] In the accompanying drawings, the structures represented by each reference numeral are listed as follows: 1: frame; 2: semicircular ring three; 3: semicircular ring one; 4: horizontal bar; 5: vertical bar; 6: floating positioning device; 7: adsorption cotton sheet one; 8: adsorption cotton sheet two; 9: module connecting device; 6-1: airbag; 6-2: inflation device; 6-3: control valve; 6-4: timing device; 6-5: control line; 6-6: positioning device; 7-1: round hole one; 8-1: round hole two; 9-1: rust-proof horseshoe lock; 9-2: rust-proof iron chain; 9-3: semicircular ring four. DETAILED DESCRIPTION

[0067] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0068] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] The product of the present invention is mainly aimed at the daily removal of sunken oil. It has the characteristics of simple operation, low technical requirements, simple and few auxiliary tools, low cost, low energy consumption, more thorough removal, small impact on the environment, less restrictions by adverse sea conditions, can be carried out all year round, and no secondary pollution. The invented product can achieve the thorough removal of sunken oil on the seabed, achieve fundamental improvement of the marine environment, and even solve the pollution problem of seasonal repeated landing of sunken oil.

[0073] like Figure 1-5 , an embodiment of the present invention provides a bottom oil removal device, comprising: at least one module and at least one floating positioning device 6;

[0074] The module comprises: a bracket and an adsorption cotton sheet; the adsorption cotton sheet is located in the bracket and connected to the bracket;

[0075] Adjacent brackets are connected to each other so that a plurality of modules extend in a horizontal direction;

[0076] The floating positioning device 6 is installed in the bracket.

[0077] In order to further optimize the above technical solution, the floating positioning device 6 includes: an air bag 6-1, a control valve 6-3, an inflation device 6-2, a control line 6-5, a timing device 6-4, a positioning device 6-6 and a shell;

[0078] The shell includes a sealing chamber and an airbag chamber, and the top and bottom ends of the airbag chamber are both provided with flip covers; the sealing chamber and / or the airbag chamber are connected to the bracket;

[0079] The control valve 6-3, the inflation device 6-2, the control line 6-5, the timing device 6-4, and the positioning device 6-6 are all fixed in the sealed chamber; the airbag 6-1 is fixed in the airbag chamber, and the top and bottom ends correspond to the flip cover position;

[0080] The airbag 6-1 is connected to the control valve 6-3, the control line 6-5, and the timing device 6-4 in sequence; the control valve 6-3 is also connected to the inflation device 6-2;

[0081] The positioning device 6 - 6 collects positioning information and transmits the information to the mobile terminal.

[0082] In order to further optimize the above technical solution, the bracket includes: a frame and a semicircular ring 3;

[0083] The semicircular ring 13 is fixedly connected to the inner side of the frame;

[0084] An adsorption cotton sheet is installed on the frame, and the adsorption cotton sheet is connected to the semicircular ring 13;

[0085] The sealing chamber and / or the airbag chamber are connected to the frame.

[0086] In order to further optimize the above technical solution, the frame includes: a frame 1, a horizontal bar 4 and a vertical bar 5; the horizontal bar 4 and the vertical bar 5 are fixed on the inner side of the frame 1 in a square grid manner;

[0087] An adsorption cotton sheet is installed on the frame 1;

[0088] The sealing chamber and / or the airbag chamber are connected to the frame 1 .

[0089] In order to further optimize the above technical solution, a circular hole is provided on the adsorption cotton sheet, and the circular hole is connected to the semicircular ring 3;

[0090] In order to further optimize the above technical solution, the adsorption cotton pieces are wavy and go around the horizontal bar 4 up and down in sequence, and the directions of adjacent adsorption cotton pieces going around the same horizontal bar 4 are opposite.

[0091] In order to further optimize the above technical solution, a semicircular ring 2 is provided on the shell;

[0092] The adsorption cotton sheet includes: an adsorption cotton sheet 1 7 and an adsorption cotton sheet 2 7; both ends of the adsorption cotton sheet 1 7 are connected to the semicircular ring 1 3;

[0093] One end of the adsorption cotton sheet 2 7 is connected to the semicircular ring 1 3, and the other end is connected to the semicircular ring 2.

[0094] In order to further optimize the above technical solution, a semicircular ring three 2 is also included; and adjacent frames 1 are connected by the semicircular ring three 2.

[0095] In order to further optimize the above technical solution, it also includes: a module connecting device 9; the semicircular rings 2 between adjacent frames 1 are connected by the module connecting device 9.

[0096] In order to further optimize the above technical solution, the module connection device 9 includes: two rust-proof horseshoe locks 9-1 and a rust-proof iron chain 9-2.

[0097] The rust-proof horseshoe lock 9-1 is connected with a semicircular ring four 9-3; both ends of the rust-proof iron chain 9-2 are connected to the rust-proof horseshoe lock 9-1 through the semicircular ring four 9-3; the semicircular ring three 2 between adjacent frames are respectively connected to a rust-proof horseshoe lock 9-1.

[0098] The present invention also provides a method for using the above device:

[0099] Taking into account the area, shape and seabed topography of the sunken oil detected, a product assembly plan is formulated according to the needs to assemble the finished product and set the timing duration. The finished product is transported to the designated sea area by ship, the timing device is turned on, and the finished product is thrown into the sea manually or by crane. Multiple finished products can be carried at a time to cover the designated area. After the timing is over, the control line controls the airbag to automatically inflate and float up, and the product is found and salvaged according to the received positioning signal. It can be reused after cleaning and replacing the cotton piece.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A bottom oil removal device, characterized in that: include: at least one module and at least one buoyancy positioning device; The module comprises: a bracket and an adsorption cotton sheet; the adsorption cotton sheet is located in the bracket and connected to the bracket; Adjacent brackets are connected to each other so that a plurality of modules extend in a horizontal direction; The floating positioning device is located at the edge or corner position of the bracket; when there are multiple modules, the floating positioning device is installed in the modules at the corner positions; The floating positioning device comprises: an air bag, a control valve, an inflation device, a control line, a timing device, a positioning device and a housing; The housing comprises a sealing chamber and an airbag chamber, and the top and bottom ends of the airbag chamber are both provided with flip covers; the sealing chamber and / or the airbag chamber are connected to the bracket; The control valve, the inflation device, the control line, the timing device, and the positioning device are all fixed in the sealed chamber; the airbag is fixed in the airbag chamber, and the top and bottom ends correspond to the flip cover positions; The airbag is connected to the control valve, the control line, and the timing device in sequence; the control valve is also connected to the inflation device; The positioning device collects positioning information and transmits the information to the mobile terminal.

2. The device for removing bottom oil according to claim 1, characterized in that: The support comprises: a frame and a semicircular ring 1; The semicircular ring 1 is fixedly connected to the inner side of the frame; The frame is provided with the adsorption cotton sheet, and the adsorption cotton sheet is connected to the semicircular ring; The sealing chamber and / or the airbag chamber are connected to the frame.

3. The device for removing bottom oil according to claim 2, characterized in that: The frame body comprises: a frame, horizontal bars and vertical bars; the horizontal bars and the vertical bars are fixed inside the frame in a square grid manner; The adsorption cotton sheet is installed on the frame; The sealing chamber and / or the airbag chamber are connected to the frame.

4. A bottom oil removal device according to claim 3, characterized in that: The adsorption cotton sheet is provided with a circular hole, and the circular hole is connected to the semicircular ring.

5. The device for removing bottom oil according to claim 4, characterized in that: The adsorption cotton sheets are in a wave-like shape and go around the horizontal bars in sequence up and down, and the directions in which the adjacent adsorption cotton sheets go around the same horizontal bar are opposite.

6. The device for removing bottom oil according to claim 5, characterized in that: The shell is provided with a second semicircular ring; The adsorption cotton sheet comprises: an adsorption cotton sheet 1 and an adsorption cotton sheet 2; both ends of the adsorption cotton sheet 1 are connected to the semicircular ring 1; One end of the second adsorption cotton sheet is connected to the first semicircular ring, and the other end is connected to the second semicircular ring.

7. A bottom oil removal device according to any one of claims 3 to 6, characterized in that: It also includes a semicircular ring three; the semicircular ring three is connected to the outer wall of the frame, and adjacent frames are connected through the semicircular ring three.

8. The device for removing bottom oil according to claim 7, characterized in that: Also includes: Module connecting device; the semicircular rings three between adjacent frames are connected by the module connecting device.

9. The device for removing bottom oil according to claim 8, characterized in that: The module connection device includes: 2 rust-proof horseshoe locks and rust-proof iron chains, The rust-proof horseshoe lock is connected with a semicircular ring four; the two ends of the rust-proof iron chain are respectively connected with the rust-proof horseshoe lock through the semicircular ring four; the semicircular rings three between adjacent frames are respectively connected with one of the rust-proof horseshoe locks.

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