Extension protection device for corrosion prevention of offshore pile body

Abstract

The utility model relates to an extension protection device for corrosion prevention of offshore pile body, the outer wall of the pile body is provided with a fixed part, the extension protection device comprises a mounting seat, a connecting mechanism, a power supply mechanism and an auxiliary anode, the mounting seat is mounted on the outer wall of the pile body and is connected with the fixed part on the outer wall of the pile body through the connecting mechanism, and the power supply mechanism is connected with the auxiliary anode through the connecting mechanism. The connecting mechanism comprises a first connecting assembly connected with the mounting base, a second connecting assembly rotationally connected with the first connecting assembly and a clamping sleeve assembly mounted on the second connecting assembly, and the clamping sleeve assembly is connected to the fixing component in a clamping mode and has a separated state capable of being separated from the fixing component; the auxiliary anode is fixedly mounted on the mounting seat and is insulated from the pile body; the anode of the power supply mechanism is electrically connected with the auxiliary anode, and the cathode is electrically connected with the pile body.

Description

TECHNICAL FIELD

[0001] The utility model relates to offshore pile anticorrosion technical field, concretely relates to a prolonging protection device for offshore pile anticorrosion. BACKGROUND

[0002] With the sustainable development and green energy more and more attention in the world, in recent years, our country offshore wind develops rapidly. Compared with the inland type wind turbine foundation, offshore wind power equipment is in the marine environment of the corrosive environment, and the corrosion problem is particularly serious.

[0003] At present, the "coating + cathodic protection" technology is mainly used to slow down the corrosion of the pile body, and the cathodic protection includes the cathodic protection method of the sacrificial anode and the cathodic protection method of the impressed current. The cathodic protection of offshore wind turbine foundation pile mostly adopts the sacrificial anode protection mode in the past, but with the progress of the cathodic protection industry technology in recent years and the improvement of environmental protection requirements, the application of the impressed current method starts to increase. However, for the old offshore wind turbine foundation pile, the sacrificial anode protection is basically adopted, and when the anticorrosion system design service life is reached, the anode block needs to be updated, which greatly increases the underwater installation cost, and it is difficult to meet the environmental protection requirements. SUMMARY

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a prolonging protection device for offshore pile anticorrosion, which can conveniently install and provide new protection on the old pile body and prolong the service life of the old pile body.

[0005] To achieve the above-mentioned purpose, the utility model provides a prolonging protection device for offshore pile anticorrosion, the pile body outer wall has a fixing part, the prolonging protection device includes a mounting seat, a connecting mechanism, a power supply mechanism and an auxiliary anode, the mounting seat is installed on the pile body outer wall and connected with the fixing part on the pile body outer wall through the connecting mechanism, the connecting mechanism includes a first connecting assembly connected with the mounting seat, a second connecting assembly rotationally connected with the first connecting assembly, a clamp sleeve assembly installed on the second connecting assembly, the clamp sleeve assembly is clamped and connected on the fixing part, and the clamp sleeve assembly has a separated state that can be separated from the fixing part; the auxiliary anode is fixedly installed on the mounting seat and insulated between the pile body; the positive electrode of the power supply mechanism is electrically connected with the auxiliary anode, and the negative electrode is electrically connected with the pile body.

[0006] Further, the fixing part includes an anode block, and the clamp sleeve assembly of the connecting mechanism is clamped on the anode block.

[0007] Further, the pile body outer wall has an anode block column group composed of a plurality of anode blocks arranged in the up-down direction, the mounting seat is connected with the connecting mechanism at different positions, and the clamp sleeve assembly of each connecting mechanism is clamped on an anode block.

[0008] Further, the clamping sleeve assembly of the connecting mechanism comprises two oppositely arranged clamping buckles movably mounted on the second connecting assembly, and a clamping locking structure, the two clamping buckles can be moved to a clamping closed state or a separated state, the two clamping buckles are clamped on the fixed part when in the clamping closed state, and the clamping locking structure can lock the two clamping buckles in the clamping closed state, the fixed part can enter or exit between the two clamping buckles when the two clamping buckles are in the separated state.

[0009] Further, the clamping buckles are provided with locking holes, the locking holes of the two clamping buckles are aligned when in the clamping closed state, and the clamping locking structure comprises a locking bolt, the locking bolt passes through the locking holes of the two clamping buckles and fixes the two clamping buckles.

[0010] Further, the first connecting assembly of the connecting mechanism comprises a connecting block, a connecting ring fixedly connected with the connecting block at one end, and a connecting block fixedly connected with the connecting ring at the other end, the mounting seat comprises a connecting side plate, and the connecting side plate is provided with a connecting socket matched with the connecting block and capable of being passed through by the connecting block, and the connecting block is rotated after passing through the connecting socket so as to abut against the two side surfaces of the connecting side plate, respectively.

[0011] Further, the auxiliary anodes are a plurality of and are arranged in the up-down direction at intervals, and the plurality of auxiliary anodes are arranged in series.

[0012] Further, the power supply mechanism comprises a constant potential instrument and a reference electrode, an input end of the constant potential instrument is used for being connected with a power supply, a positive electrode of the constant potential instrument is electrically connected with the auxiliary anode, and a negative electrode is electrically connected with the pile body, and the reference electrode is connected in series with the auxiliary anode.

[0013] Further, the power supply mechanism further comprises a current sensor, the current sensor is connected in series with the auxiliary anode and is used for measuring the current passing through the auxiliary anode, and the auxiliary anode is connected in communication with the constant potential instrument.

[0014] Further, the mounting seat comprises a metal base part and an insulating anti-corrosion coating arranged on the metal base part, and the positive electrode of the constant potential instrument is further electrically connected with the metal base part of the mounting seat.

[0015] As described above, the extension protection device has the following beneficial effects:

[0016] The old pile body can be installed on the old pile body which has been used for a certain period of time, stable and fast connection is realized through the connecting mechanism and by means of the existing anode block or other type structure fixing part on the outer wall of the pile body, the cathodic protection mode of impressed current is adopted, the current is provided by the power supply mechanism, the pile body is electrically connected with the negative electrode as the cathode, so as to provide corrosion protection for the pile body, the new protection is provided through the extension protection device, the service life of the old pile body is prolonged, and a new anode block is not needed; The extension protection device can well overcome the problem that the corrosion effect of the old offshore wind power large-diameter pile is affected after the serious corrosion of the anode block in the prior art, solves the problem of underwater installation difficulty caused by the periodic replacement of the anode block, can improve the corrosion effect of the offshore wind power large-diameter pile, and realizes the service life extension of the offshore wind power large-diameter pile. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an installation schematic view of the extension protection device of the utility model on the pile body.

[0018] Figure 2 It is a partial structure schematic view of the extension protection device in the utility model.

[0019] Figure 3 It is a connection schematic view of the connecting mechanism and the mounting seat in the utility model.

[0020] Figure 4 It is a structure schematic view of the connecting mechanism in the utility model.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 1 pile body

[0023] 11 outer platform

[0024] 2 anode block

[0025] 21 anode connecting part

[0026] 3 mounting seat

[0027] 31 connecting side plate

[0028] 32 connecting bayonet

[0029] 33 placing pad plate

[0030] 34 cable slot

[0031] 4 constant potential instrument

[0032] 5 reference electrode

[0033] 6 auxiliary anode

[0034] 7 current sensor

[0035] 8 connecting mechanism

[0036] 81 first connecting assembly

[0037] 811 connecting block

[0038] 812 connecting ring

[0039] 813 connecting block

[0040] 82 second connecting assembly

[0041] 83 clamping sleeve assembly

[0042] 831 clamping buckle

[0043] 832 locking bolt

[0044] 84 pin shaft

[0045] 9 cable DETAILED DESCRIPTION

[0046] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0047] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the specification are only for clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0048] Referring to Figures 1 to 4The utility model provides a prolongation protection device for offshore pile anticorrosion, and the pile 1 outer wall has fixed parts, wherein the fixed parts can be the original anode block 2 that already exists on the pile 1 outer wall or other structures fixed on the pile 1 outer wall.

[0049] The basic working principle of the prolongation protection device is as follows: the prolongation protection device can be used to install on an old pile 1 that has been used for a certain period of time. Generally, the pile 1 outer wall is provided with an anode block 2, and can also have other types of fixed parts. During installation, the mounting seat 3 is connected to the fixed parts on the pile 1 outer wall through the connecting mechanism 8. Specifically, the mounting seat 3 is placed at an appropriate position on the pile 1 outer wall. According to the position of the fixed parts, the position of the clamping sleeve assembly 83 can be adjusted by rotating the second connecting assembly 82 relative to the first connecting assembly 81, so that the clamping sleeve assembly 83 is clamped and connected to the fixed parts nearby. Thus, the mounting seat 3 is stably installed on the pile 1 outer wall, and the installation is flexible and convenient without the need for underwater welding operations. The prolongation protection device adopts an impressed current cathodic protection method. The power supply mechanism provides current, the auxiliary anode 5 is connected to the positive electrode of the power supply mechanism, and the pile 1 is electrically connected to the negative electrode as a cathode. Thus, the pile 1 is provided with anticorrosion protection. The prolongation protection device can be added to the pile 1 after the original anode block 2 is used to a certain extent, thereby providing new protection and prolonging the service life of the old pile 1 without the need for replacing a new anode block 2.

[0050] Referring to Figures 1 to 4 The utility model is further described below with one specific embodiment:

[0051] In this embodiment, referring to Figure 2 As a preferred design, the fixed parts on the pile 1 outer wall mainly include the anode block 2, and the clamping sleeve assembly 83 of the connecting mechanism 8 is clamped on the anode block 2. The upper and lower ends of the anode block 2 are provided with anode connection parts 21 welded to the pile 1 outer wall. Preferably, each anode block 2 is connected to two connecting mechanisms 8, and the clamping sleeve assemblies 83 of the two connecting mechanisms 8 are clamped on the anode connection parts 21 at the upper and lower ends of the anode block 2, respectively.

[0052] In the embodiment, referring to Figure 1 and Figure 2 , as a preferred design, a plurality of anode blocks 2 are arranged in the up-down direction of the pile body 1 to form an anode block column group, a plurality of anode block column groups are arranged in the circumferential direction of the pile body 1, the upper anode blocks 2 in the anode block column group are preferably arranged at equal intervals, the mounting seat 3 extends in the up-down direction, the lower end of the mounting seat 3 is located at a position extending close to the seabed surface, the upper end of the mounting seat 3 is located above the water surface, and the mounting seat 3 can be fixedly connected with the upper platform 11 fixed to the pile body 1. The mounting seat 3 is connected with the connecting mechanism 8 at different height positions, and the connecting mechanism 8 is preferably arranged at equal intervals in the up-down direction, so that the clamping sleeve assembly 83 of the connecting mechanism 8 at different height positions can be clamped on the corresponding anode block 2 near the height of the connecting mechanism 8, thereby achieving multi-point connection. Further preferably, the mounting seat 3 is installed between two adjacent anode block column groups, and a plurality of connecting mechanisms 8 are connected to the left and right sides of the mounting seat 3, respectively. The connecting mechanisms 8 on the two sides are clamped and connected to the anode block 2 columns of the anode block column groups on the two sides, respectively, thereby further stabilizing the mounting seat 3.

[0053] In the embodiment, referring to Figure 3 and Figure 4 , as a preferred design, the clamping sleeve assembly 83 of the connecting mechanism 8 includes two oppositely arranged clamping buckles 831 movably installed on the second connecting assembly 82 and clamping locking structures. Specifically, the two clamping buckles 831 are connected to the second connecting assembly 82 through the pin shaft 84 and can rotate around the pin shaft 84. The two clamping buckles 831 can be rotated to a clamping closed state, at which time they can be stably clamped on the anode block 2. The clamping locking structures can lock the two clamping buckles 831 in the clamping closed state. The two clamping buckles 831 can be rotated to a separated state, at which time the fixed component can be inserted between or removed from the two clamping buckles 831. Before underwater installation, the two clamping buckles 831 are first in the separated state, so that the anode connecting part 21 of the anode block 2 can smoothly enter between the two clamping buckles 831. Then, the two clamping buckles 831 are rotated to the clamping closed state, and the clamping locking structures are used to lock the two clamping buckles 831 in the clamping closed state, thereby achieving stable connection and flexible and convenient installation. In the embodiment, the clamping buckles 831 are provided with locking holes, and the locking holes of the two clamping buckles 831 are aligned when the clamping buckles 831 are in the clamping closed state. The clamping locking structures include locking bolts 832, which pass through the locking holes of the two clamping buckles 831 and fix the two clamping buckles 831. The locking bolts 832 can be directly screwed with the locking holes or can be fixed with the two clamping buckles 831 in a nut cooperation manner. In other embodiments, the two clamping buckles 831 can be installed on the second connecting assembly 82 in a linear movement or other movement manner, as long as they can achieve the effects of clamping and separating. The clamping locking structures can also adopt other existing suitable structure designs.

[0054] In the embodiment, referring to Figure 3 and Figure 4 , as a preferred design, the first connecting component 81 of the connecting mechanism 8 comprises a connecting block 811, a connecting ring 812 fixedly connected to one end of the connecting block 811, and a connecting block 813 fixedly connected to the other end of the connecting ring 812, and the second connecting component 82 is installed on the connecting block 813 through a pin shaft 84 and can rotate flexibly. The mounting base 3 comprises a connecting side plate 31, and a connecting socket 32 is formed on the connecting side plate 31 and can be used for the connecting block 811 to pass through. When the connecting mechanism 8 is connected with the connecting side plate 31, the connecting block 811 is rotated by a certain angle after passing through the connecting socket 32, so that the connecting block 811 and the connecting block 813 are respectively abutted on two side surfaces of the connecting side plate 31, thereby clamping the first connecting component 81 on the mounting base 3, and the mounting and dismounting are quick and convenient. The connecting side plate 31 is provided with a plurality of connecting sockets 32 at equal intervals in the up-down direction, and the connecting mechanism 8 can be clamped in the connecting socket 32 at a suitable height as needed during installation. The connecting socket 32 and the connecting block 811 can be selected in various suitable shapes, and the specific limitation is not made. In other embodiments, the first connecting component 81 can also be connected with the mounting base 3 in other ways, for example, a bolt can pass through the connecting side plate 31 and be screwed into the first connecting component 81, and quick and stable connection can also be achieved.

[0055] In the embodiment, referring to Figure 1 and Figure 2 , as a preferred design, the auxiliary anode 5 is a plurality of and is arranged at intervals along the up-down direction and is arranged at equal intervals, the plurality of auxiliary anodes 5 are connected through the cable 9 and are arranged in series, the uppermost auxiliary anode 5 is connected with the positive pole of the power supply mechanism through the cable 9, and the plurality of auxiliary anodes 5 arranged at equal intervals and uniformly are used to obtain a uniformly distributed electric field, thereby uniformly protecting the pile body 1 at different heights and avoiding the phenomenon of over-protection or insufficient protection.

[0056] In the embodiment, referring to Figure 1 and Figure 2As a preferred design, the power supply mechanism comprises a constant potential instrument 4 and a reference electrode 5, the constant potential instrument 4 is arranged on the water, and is specifically installed on the outer platform 11 fixed to the pile body 1 and located above the water surface, an input end of the constant potential instrument 4 is used for being connected with a power supply, a positive electrode and a negative electrode of the constant potential instrument 4 are positive and negative electrodes output by the power supply mechanism, the positive electrode of the constant potential instrument 4 is electrically connected with the auxiliary anode 5 through the cable 9, and the negative electrode is electrically connected with the pile body 1, the reference electrode 5 is connected with the pile body 1 and is connected in series with the auxiliary anode 5 through the cable 9, and the reference electrode 5 is preferably arranged at the bottom of the mounting seat 3, that is, close to the position of the sea bottom surface. The constant potential instrument 4 and the reference electrode 5 constitute a negative feedback current output system, form a closed loop regulation with the pile body 1 to be protected, have a constant current output function, measure the energized point potential through the reference electrode 5 as a sampling signal, compare the sampling signal with a control signal, realize control and adjust the polarization current output, and enable the energized potential to be kept at a set control potential. The specific structure and principle of the constant potential instrument 4 and the reference electrode 5 are known in the art, and will not be described in detail. Further, the power supply mechanism further comprises current sensors 7, the number of the current sensors 7 is the same as that of the auxiliary anodes 5, one current sensor 7 is connected in series before or after each auxiliary anode 5, the current sensor 7 is used for measuring the current passing through the auxiliary anode 5, and is connected in communication with the constant potential instrument 4 through the cable 9, can transmit the measured current data signal to the constant potential instrument 4, compares the measured current passing through the auxiliary anode 5 with the output current on the constant potential instrument 4, thereby evaluates the insulation condition between the auxiliary anode 5 and the pile body 1 through the mounting seat 3, and monitors whether the direct conduction condition occurs between the auxiliary anode 5 and the pile body 1. Preferably, the constant potential instrument 4 is further used for being connected in communication with a monitoring system of the platform on the water, through reading of the working data by the staff, including the current signal data detected by each current sensor 7, thereby monitoring the use condition of the extension protection device in real time, and processing the abnormal condition in time.

[0057] In the embodiment, referring to Figure 1 and Figure 2As a preferred design, the mounting seat 3 is a vertically extended long strip-shaped groove plate structure, both sides of which are provided with connecting side plates 31 connected with the connecting mechanism 8, and a cable groove 34 extending in the up-down direction is fixedly arranged in the mounting seat 3 for the extension wiring of the cable 9, and the cable 9 is fixedly connected to the cable groove 34. A placement pad 33 is fixedly arranged in the mounting seat 3, and the number of the placement pad 33 is arranged as required, and the placement pad 33 is preferably arranged horizontally, and the auxiliary anode 5, the current sensor 7 and the reference electrode 5 are all fixedly placed on the upper end surface of the pad, so as to ensure stable installation. The entire mounting seat 3 can be made of a metal material with appropriate hardness and strength parameters, and an insulating anticorrosion coating is arranged on the surface of the mounting seat 3, so that the auxiliary anode 5 and the mounting seat 3 and the mounting seat 3 and the pile body 1 are all insulated, so as to ensure that the auxiliary anode 5 and the pile body 1 are not directly conducted. At the same time, the upper end of the mounting seat 3 is located on the water, and the metal base part thereof can be electrically connected with the negative electrode of the constant potential instrument 4, so as to protect the metal base part of the mounting seat 3 and avoid corrosion when the insulating anticorrosion coating is damaged. And by comparing the current measured through the auxiliary anode 5 with the output current on the constant potential instrument 4, the damage and shedding of the insulating anticorrosion coating can be judged, so as to repair the anticorrosion coating and prevent the corrosion of the pile body 1 and the mounting seat 3. In other embodiments, the mounting seat 3 can also be made of an insulating and anticorrosive material, and has appropriate hardness and strength.

[0058] As can be seen from the above, the extension protection device has the following beneficial effects:

[0059] 1. The old pile body 1 that has been used for a certain period of time can be installed, and the connecting mechanism 8 and the existing anode block 2 or other type of fixed part on the outer wall of the pile body 1 are used to realize stable and fast connection, and the cathodic protection mode is used, the current is provided by the power supply mechanism, the pile body 1 is electrically connected with the negative electrode as the cathode, so as to provide corrosion protection for the pile body 1, and the extension protection device provides new protection, prolongs the service life of the old pile body 1, and does not need to replace a new anode block 2; the extension protection device can well overcome the problem that the anode block 2 is seriously corroded in the existing technology, and the corrosion effect is affected, solves the problem of underwater installation difficulty caused by periodic replacement of the anode block 2, can improve the corrosion effect of the offshore wind power large-diameter pile, and realizes the service life extension of the offshore wind power large-diameter pile.

[0060] 2、The mounting seat 3 is connected with the anode blocks 2 at different heights through the connecting mechanisms 8 at different heights, and is stable and reliable; the connecting mechanisms 8 can be conveniently connected with the anode blocks 2, the first connecting assembly 81 and the second connecting assembly 82 of the jacket assembly 83 can be flexibly rotated relative to the mounting seat 3, so that the position of the jacket assembly 83 is adjusted according to the position of the anode blocks 2 on the outer wall of the pile body 1, and the jacket assembly 83 is conveniently clamped and connected on the anode blocks 2; the jacket assembly 83 can be flexibly and stably clamped on the anode blocks 2 during installation.

[0061] 3、The power supply mechanism can stably provide required current and voltage by arranging the constant potential instrument 4 and the reference electrode 5, and can provide stable protection; and the current sensor 7 is arranged to detect the current passing through the auxiliary anode 5, so as to judge whether the insulating anti-corrosion coating of the mounting seat 3 is damaged and peeled off, thereby judging whether the auxiliary anode 5 is directly conducted with the pile body 1, and the corrosion of the pile body 1 and the mounting seat 3 can be prevented.

[0062] In summary, the utility model effectively overcomes the shortcomings in the prior art and has high industrial utilization value.

[0063] The above-mentioned embodiments only exemplarily illustrate the principle and effects of the utility model, and are not used for limiting the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An extension protection device for offshore pile anticorrosion, the pile (1) has a fixed component on the outer wall, characterized in that: The prolonging protection device comprises a mounting seat (3), a connecting mechanism (8), a power supply mechanism and an auxiliary anode (6), the mounting seat (3) is mounted on the outer wall of the pile body (1) and is connected with the fixing component on the outer wall of the pile body (1) through the connecting mechanism (8), the connecting mechanism (8) comprises a first connecting assembly (81) connected with the mounting seat (3), a second connecting assembly (82) rotationally connected with the first connecting assembly (81), and a clamping sleeve assembly (83) mounted on the second connecting assembly (82), the clamping sleeve assembly (83) is clamped on the fixing component, and the clamping sleeve assembly (83) has a separated state capable of being separated from the fixing component; the auxiliary anode (6) is fixedly mounted on the mounting seat (3) and is insulated between the mounting seat (3) and the pile body (1); the positive electrode of the power supply mechanism is electrically connected with the auxiliary anode (6), and the negative electrode is electrically connected with the pile body (1).

2. The extension protection device for offshore pile corrosion protection according to claim 1, characterized in that: The fixing component comprises an anode block (2), and the clamping sleeve assembly (83) of the connecting mechanism (8) is clamped on the anode block (2).

3. The extension protection device for offshore pile corrosion protection according to claim 2, characterized in that: The outer wall of the pile body (1) is provided with an anode block column group composed of a plurality of anode blocks (2) arranged in the up-down direction, the mounting seat (3) is connected with the connecting mechanism (8) at different positions, and the clamping sleeve assembly (83) of each connecting mechanism (8) is clamped on an anode block (2).

4. The extension protection device for offshore pile corrosion protection according to claim 1, characterized in that: The clamping sleeve assembly (83) of the connecting mechanism (8) comprises two oppositely arranged clamping buckles (831) movably mounted on the second connecting assembly (82) and clamping locking structures, the two clamping buckles (831) can be moved to a clamping closing state or a separated state, the two clamping buckles (831) can be clamped on the fixing component when being in the clamping closing state, and the clamping locking structures can lock the two clamping buckles (831) in the clamping closing state, and the fixing component can enter and exit between the two clamping buckles (831) when the two clamping buckles (831) are in the separated state.

5. The extension protection device for offshore pile corrosion protection according to claim 4, characterized in that: Locking holes are arranged on the clamping buckles (831), the locking holes of the two clamping buckles (831) are aligned when being in the clamping closing state, and the clamping locking structures comprise locking bolts (832), the locking bolts (832) pass through the locking holes of the two clamping buckles (831) and fix the two clamping buckles (831).

6. The extension protection device for offshore pile corrosion protection according to claim 4, characterized in that: The first connecting assembly (81) of the connecting mechanism (8) comprises a connecting clamping block (811), a connecting ring (812) fixedly connected with one end of the connecting clamping block (811), and a connecting block (813) fixedly connected with the other end of the connecting ring (812), the mounting seat (3) comprises a connecting side plate (31), and a connecting clamping hole (32) adapted to the connecting clamping block (811) and capable of being passed through by the connecting clamping block (811) is formed in the connecting side plate (31), and the connecting clamping block (811) is rotated after passing through the connecting clamping hole (32) so that the connecting clamping block (811) and the connecting block (813) are respectively abutted on the two side surfaces of the connecting side plate (31).

7. The extension protection device for offshore pile corrosion protection according to claim 1, characterized in that: The auxiliary anode (6) is a plurality of auxiliary anodes arranged at intervals in the up-down direction, and the plurality of auxiliary anodes (6) are connected in series.

8. The extension protection device for offshore pile corrosion protection according to claim 1, characterized in that: The power supply mechanism comprises a constant potential instrument (4) and a reference electrode (5), an input end of the constant potential instrument (4) is used for being connected with a power supply, a positive pole of the constant potential instrument (4) is electrically connected with an auxiliary anode (6), a negative pole is electrically connected with a post body (1), and the reference electrode (5) is connected in series with the auxiliary anode (6).

9. The extension protection device for offshore pile corrosion protection according to claim 8, characterized in that: The power supply mechanism further comprises a current sensor (7), the current sensor (7) is connected in series with the auxiliary anode (6) and is used for measuring a current passing through the auxiliary anode (6), and the auxiliary anode (6) is connected in communication with the constant potential instrument (4).

10. The extension protection device for offshore pile corrosion protection according to claim 9, characterized in that: The mounting seat (3) comprises a metal base portion and an insulating anticorrosion coating arranged on the metal base portion, and the positive pole of the constant potential instrument (4) is further electrically connected with the metal base portion of the mounting seat (3).

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