CN114750896A

CN114750896A - Restoring method of Doppler transducer

Info

Publication number: CN114750896A
Application number: CN202210423056.2A
Authority: CN
Inventors: 张雪琴; 杨涛; 李俊; 徐海涛
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-07-15

Abstract

The invention provides a reduction method of a Doppler transducer, which mainly comprises a ship body dry dock scheme, a ship bottom outer plate embedding scheme, a flaw detection test after outer plate embedding and an air tightness inspection test after Doppler transducer reduction.

Description

Restoring method of Doppler transducer

Technical Field

The invention relates to the technical field of ships, in particular to a restoring method of a Doppler transducer.

Background

With the emergence of large ships and other navigation and positioning requirements, the navigation system can provide the ground speed and the traversing speed of the ship when the ship needs to advance and retreat, and also needs to enter and exit and berth at a wharf. To meet new demands, doppler transducers (also known as doppler logs) have been developed and subsequently incorporated into ship navigation systems. The speed measurement principle of the Doppler log is that an energy transducer is adopted to emit an acoustic pulse signal with a certain frequency to the seabed, and the ship motion parameter information is measured by detecting the time delay and the frequency difference (the so-called Doppler frequency shift phenomenon) between an echo signal and an emitted signal. The Doppler log can provide longitudinal and transverse two-dimensional speeds of the ship relative to the seabed or a water layer, and the speed of the Doppler log is not easily influenced by Wen flow, and is accurate and stable; when the ship turns around by maneuvering, the Doppler log cannot distort the speed; in the aspect of speed measurement precision calibration, the Doppler log only needs single-point calibration and has unique advantages. The transducer of the assembly of most boats and ships in the existing market is 350KHz Doppler log, because 350KHz Doppler log transducer can not avoid in the installation can with the hull bottom deck formation difference in height, expose in the outside completely, there is the inclination because of this mounted position hull bottom planking, for outstanding hull bottom portion and hull bottom planking smooth transition behind the vertical installation of messenger's transducer, for reducing the influence that rivers reached the impact of equipment and probably caused under big rivers environment, the fair water can install the kuppe additional in the hull outside, with the drainage through rivers, reduce the hydrophone or the influence of transducer normal work to equipment, lay the guide plate between transducer and hull bottom planking.

In the invention patent with the patent number ZL202011343985.X, a method for replacing a high-frequency Doppler transducer of a ship is specifically explained, the problem of local cavitation caused by installing a flow guide cover is solved, and the speed measurement precision of a Doppler log on the ship is improved to a certain extent. In order to research the results, 15 times of test projects are carried out on 8 real ships in 3 years before and after, wherein the installation positions of a Doppler velocity measuring instrument and a depth measuring instrument sensor on No. 4 ships are exchanged, and in practical research, after the positions of a Doppler transducer and a depth measuring instrument in a cabin are exchanged, the exchanged installation positions are not suitable for installing the Doppler transducer, and based on the fact that the installation states of the Doppler transducer and the depth measuring instrument transducer in the cabin have consistency, namely the Doppler transducer and the depth measuring instrument transducer have the same installation standard, a method is necessary to be provided for restoring the installation positions of the depth measuring instrument and the Doppler transducer equipment to the original state.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method for restoring a doppler transducer, which solves the problem that the installation position of the doppler transducer and a depth finder is changed and the technical state is not correct, and restores the technical state such as the installation position and installation of the original equipment on a ship.

To achieve the above and other related objects, the present invention provides a restoring method of a doppler transducer, the restoring method comprising the steps of:

s1: preparing the original bases of the depth finder and the Doppler transducer before cutting;

s2: cutting off an original base;

s3: the inlaying and welding of hull planking specifically includes:

firstly, determining an embedding range, setting a steel material cutting instruction, and cutting a required steel plate material completely according to the size of the cutting instruction; then, according to the requirements of relevant drawings, welding the port patch plate and the starboard patch plate with the outer plate of the ship body completely; removing the welding seam defect section by using a carbon arc gouging or batch chiseling, not allowing to perform melting removal by using an electric arc or gas flame, and performing weld repair after the defect is removed and a proper groove is formed; forming a proper groove according to the defect condition of the welding seam, wherein the groove does not allow any welding seam defect to continuously exist, burrs and dents are not allowed to exist, and the bottom of the groove is semicircular and is not allowed to form a sharp angle shape; before repair welding, the groove and two sides are cleaned carefully within 30mm, and dirt including rust, oxide skin, moisture and oil dirt is removed; preheating is needed before repairing the weld defects of the weld joint with the preheating requirement and the part with large restraint intensity; after the defects of the welding seams are removed, repair welding is carried out by adopting manual welding, submerged arc automatic welding or gas shielded welding; after welding, a welder performs self-inspection on the welding seam, eliminates appearance defects according to requirements, reports a process and an inspector if the welding seam is found, eliminates the welding seam after the process and the inspector carry out the appearance inspection on the welding seam and measure the appearance size of the welding seam, and records and files the welding position and the quality condition of the welder; the welding quality and the tightness of the welding seam are qualified by the inspection of an inspection department.

Optionally, the reduction method further comprises the steps of:

s4: flaw detection after outer plate embedding specifically includes:

the ultrasonic flaw detection technology is adopted to detect the flaw of the welding seam, welding spatters, scrap iron, oil stains and other external impurities are removed in the moving area of the ultrasonic probe, the flaw detection surface is guaranteed to be flat and smooth, the probe can be conveniently and freely scanned, and the ultrasonic probe can be polished if necessary; the ultrasonic flaw detection of the welding seam is carried out after the welding is finished for 48 hours; according to the echo height area and the defect indication length; grading the detection result; when the detection is carried out from two aspects, if the same defect grade division is different, the grade division of the lower grade is selected; at the same depth, the distance between the defect and the defect is smaller than the indicating length of the longer defect, the defect and the defect are regarded as the same defect, the interval is taken as the defect treatment together, and the distance between the defect and the defect is larger than the indicating length of the longer defect, and the defect can be regarded as independent defects; and (4) judging that the flaw is unqualified if the flaw is considered to be a harmful defect such as crack, incomplete fusion, incomplete penetration and the like according to experience by flaw detectors, and repairing all unqualified welding seams according to regulations.

Optionally, the reduction method further comprises the steps of:

s5: the installation of new base specifically includes:

S5-1, after the new base and the outer plate are welded and polished, the welding quality and the tightness of the welding seam are qualified through the inspection of an inspection department;

s5-2, after the welding quality and the tightness of the welding seam are checked to be qualified, installing and welding a guide plate of the base of the depth finder, polishing the welding seam after the installation and welding of the guide plate are finished, and enabling the guide plate to be in smooth transition with an outer plate, wherein the method specifically comprises the following steps:

a) before the bases of the depth finder and the Doppler log are installed, the fore-aft line of the ship body at the base is scribed in advance according to a centering mark plate in a cabin of the depth finder, wherein the deviation between the fore-aft line of the base of the Doppler log and the fore-aft line of the ship body is not more than 0.5 degrees;

b) when the base of the depth finder and the base of the Doppler log are installed, the lower plane of the base is preferably ensured to be flush and conformal with the outer plate;

c) after the bases of the depth finder and the Doppler log are welded with the outer plate, the welding line is polished to be flush and conformal with the outer plate, only a small amount of polishing is allowed to be performed on the bases near the welding line during polishing, and the polishing is not allowed to be performed on the matching surface of the bases and the sensor;

d) after the bases of the depth finder and the Doppler log are welded and polished, the inclination angle of the upper surface of the base is measured and then submitted to an equipment service provider, and the equipment service provider corrects the equipment.

Optionally, the reduction method further comprises the steps of:

s6: installation of transducer and depth finder specifically includes:

s6-1, checking the surface of the transducer array acoustic window, removing marine organisms on the surface, uniformly coating 1-2 ℃ with chlorinated rubber anti-pollution paint at a falling part when the paint on the surface falls off, then placing for 24 hours at normal temperature, then installing, removing with detergent when the surface is adhered with oil stains or is not clean, finally, vertically placing the transducer array acoustic window in a gate valve after being cleaned with clear water, and paying attention to the fore-aft line direction;

s6-2, replacing a gasket on the valve body and two O-shaped rings on a flange, sleeving an upper flange on the transducer array, then sequentially sleeving an O-shaped ring and a small sealing flange on an array sheath, and slowly placing the upper flange at the bottom;

s6-3, clamping the array protection tube by a half clamping plate, placing the transducer array and the flange assembly on the valve body by a hoisting tool, aligning the upper flange with the stem and stern reticle of the ship, fastening by a fastening piece, and not allowing the array sound-transmitting surface to touch the valve body and other hard objects in the whole installation;

s6-4, mounting small sealing flanges, carefully checking the mounting conditions of all places, opening the gate valve after confirming that the sealing performance is good, trying to rotate a valve hand wheel by using a tool when seeing that a pointer at the hand wheel points to an opening scale line, and putting down an energy converter matrix after confirming that the valve of the gate valve is completely opened until the scale line on the protective pipe is flush with the end faces of the small sealing flanges;

S6-5, rotating the half clamping plate to align the stem reticle of the matrix with the reticle on the valve;

s6-6, checking the sealing performance of the small sealing flange again;

s6-7, installing and fastening a half splint;

s6-8, plugging a cable plug, finishing the installation, and checking the installation condition of each part again;

and S6-9, completing the installation of the depth finder again according to the steps.

Optionally, the reduction method further comprises the steps of:

s7: and the air-tight test after installation comprises a cabin air-tight test, a local vacuum-pumping test and a weld kerosene coating test.

Optionally, the process of the cabin airtightness test is as follows:

when the cabin reaches the pressure of 0.0294MPa, the duration time is not less than 1 hour, the inspection is carried out after 1 hour, and the water leakage and water seepage phenomena do not occur at the detected part of the irrigation test, so that the cabin is qualified; the soap liquid at the detected part of the aeration test does not generate bubbles, and the qualified soap liquid is obtained if the pressure drop in the cabin does not exceed 3 percent of the specified pressure or no obvious pressure drop exists.

Optionally, the process of the partial vacuum test is as follows:

during the negative pressure test, after the air extraction time is 1-2 seconds, the test can be carried out when the negative pressure of not less than 0.033MPa is obtained, and according to the type of a welding line, only the corresponding device is required to be covered on a welding section which is coated with soap liquid in advance during the test, then air is extracted, so that the negative pressure is formed in the cover, and no air bubbles are generated, so that the negative pressure is qualified.

Optionally, the process of the seam kerosene test is as follows:

the kerosene painting test is suitable for weld inspection, and the time for painting kerosene is not less than the specified time for a single-side weld; 2 times of the time for setting the double-sided welding seam to be the single-sided welding seam; when the environment temperature is lower than 0 ℃, the part to be detected is properly heated and dried in a kerosene coating test, and after the kerosene test action for a specified time, the chalk powder surface brushed on the part to be detected of the welding line is qualified if no kerosene spot is found.

Optionally, the restoring method further comprises preparation work before docking, including:

d1: the preparation work in the docking front dock specifically comprises the following steps:

1. before corrugation is removed, the bottom surface of the dock needs to be cleaned, and a centerline of the bottom of the dock needs to be marked;

2. arranging the docking front dock internal row ridges in place as required, and arranging keel piers and side piers in the ship dock according to a docking ridge wood arrangement diagram;

3. when arranging a central keel block and a side block, determining a rib line, then respectively projecting the rib line and a central line of the dock bottom to one side of a dock wall bank and the upper surfaces of a dock front end bank and a dock gate by using a laser theodolite and marking the rib line and the central line by using marks for correctly positioning the block when a ship enters the dock;

4. A dock bottom central buoy is arranged on the center line of the dock keel block at the head end rib position and the tail end rib position and is used for traction positioning during docking;

5. inspection of docking blocks (Keel blocks in the middle and side blocks on the edge)

a) Checking the contact ratio of the dock bottom central line and the box body central line;

b) checking the correctness of the rib position and the height size of the keel pier according to the length direction of the ship;

c) checking the levelness of the upper surface of the keel pier (namely the levelness of the ship base line);

d) checking the correctness of the center lines of the upper surfaces of one side of the dock wall and the top end of the head and the tail of the dock;

e) checking 7 the correctness of the positioning rib number (angle square line) and the distance middle size of the side pier;

f) checking the line type of the upper surface of the side pier by using a line type sample plate;

g) checking the connection and fixation between the upper layer pier and the lower layer pier of the side pier and the fixation condition of the upper surface edge wood and the structure of the central keel pier;

h) checking the fixing conditions of the central box body structure and the upper edge wood, including whether the iron hasp is fastened or not, and whether the edge wood is padded or not;

6. tolerance requirements at inspection

a) The front and back levelness deviation of the upper surface of the middle keel pier is +/-3 mm;

b) the horizontal deviation of the base line of the side pier is +/-3 mm;

c) deviation of the goodness of fit between the upper surface line shape of the side pier and the sample plate is +/-3 mm;

d) the deviation between the center of the side pier and the center of the ship body is +/-2 mm;

e) The deviation between the rib position of the side pier and the theoretical rib position is +/-3 mm.

Optionally, the preparing further comprises:

d2: stupefied wood arrangement work in dock

1. When the ship enters a harbor basin channel, the tide level is more than 2.6 m;

2. in order to ensure the safety of the docking of the ship, the water depth in the dock during docking must be more than 15 m;

3. when in docking, the ship is ensured to be accurately positioned by using a mark set in advance;

4. after the piers are seated, according to the arrangement drawing requirements of the docking arris, the first edge of the head part and the reinforced middle pier on the central road plate, the tail part seat edge high pier or the wood square pillar and the tail end central high pier are quickly positioned in place and fastened and tamped;

5. immediately emptying water in the flow guide sleeve after the ship sits on the pier;

6. and finally, placing the blocks at the bottom of the bow ship bottom according to the requirements of the corrugated wood layout.

The invention provides a reduction method of a Doppler transducer, which mainly comprises a ship body dry dock scheme, an embedding scheme of a ship bottom outer plate, a flaw detection test after the outer plate is embedded and an air tightness inspection test after the Doppler transducer is reduced.

Drawings

Fig. 1 shows a schematic view of the inlaying of the hull plate.

Fig. 2 is a schematic view showing the installation positions of the doppler transducer and the depth finder after restoration.

Figure 3 shows a schematic view of the installation of a doppler transducer.

Figure 4 shows a front view of a doppler transducer.

Figure 5 shows a top view of a doppler transducer.

Description of the reference numerals

1 transducer array

2 base

3 Small flange gasket

4 valve gasket

5 sealing gasket

6 rear anchor ear

7 front anchor ear

8 upper flange

9 stainless steel gate valve

10O-shaped ring

11 hanging ring

12 hull plate

13 hull base

14 air guide sleeve

15 valve hand wheel

21 port board patch board

22 starboard patch board

100 Doppler transducer

200 depth finder

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structure are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Spatially relative terms, such as "under," "below," "lower," "below," "over," "upper," and the like, may be used herein for convenience in describing the relationship of one element or feature to another element or feature illustrated in the figures. It will be understood that the spatial relationship terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. As used herein, "between … …" is meant to include both endpoints.

In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of each component in actual implementation may be changed freely, and the layout of the components may be more complicated.

The invention provides a restoring method of a Doppler transducer, which is characterized in that a depth finder and the Doppler transducer of a certain cabin are exchanged in mounting positions in order to find a proper mounting position according to test requirements. The difficult points comprise a ship body dry dock scheme, an embedding scheme of a ship bottom outer plate, a flaw detection test after the outer plate is embedded and an air tightness inspection test after the Doppler transducer is restored, and the scheme for solving the technical problem is as follows:

s1: the original base of the depth finder and the Doppler transducer is prepared before cutting.

The base is replaced in a pier sitting state in a dock, equipment, cables, pipes, dressings and insulation which affect the disassembly and assembly of the base nearby the base are temporarily disassembled, the equipment and the cables are well protected, an oil tank nearby the base is ensured to be in an oil-free state, and explosion measurement is carried out when necessary; open fire operation procedures are performed before construction, construction monitoring work is well done, and construction safety is ensured; if the construction is carried out at night, the lighting work of the corresponding part is done in advance, the safety protection work at night is enhanced, and a 36V safety lamp is adopted for lighting; the depth measurement log cabin is relatively narrow and closed, and when the narrow cabin is welded, a monitoring system is set to closely pay attention to the dynamics of welders, so that safety protection work including ventilation is practically done.

S2: and (4) cutting off the original base.

S2-1, before the original base is dismantled, the guide plate welded on the outer plate around the base is dismantled, the root is left for 3 mm-5 mm when the connecting weld joint of the guide plate and the outer plate is dismantled, and then the outer plate is polished without being damaged.

S2-2, the original base can be damaged when the original base is disassembled, so that the damage to the outer plate at the welding seam is reduced. The aperture of the opening on the outer plate after the base is detached is controlled, and the assembly gap between the new base and the outer plate is reduced.

S2-3, removing the original welding line by adopting a carbon arc gouging method when the original base is dismantled so as to reduce the clearance and forbid adopting a flame cutting method.

S2-4, after the original base is disassembled, the edge of the open hole is polished, and burrs and sharp edges are removed.

S3: and (4) repairing and welding the hull plate.

It is necessary to restore the depth finder on the starboard side to the port side and the doppler transducer on the port side to the starboard side. Relates to the construction of inlaying and welding of the outer plates of the left and right side boards. The specific range is shown in fig. 1, and the embedding sizes are respectively: the port panel 21 was 540mm 380mm and the starboard panel 22 was 540mm 430 mm. Firstly, determining an embedding range, setting a steel material cutting instruction, and cutting a required steel plate material completely according to the size of the cutting instruction; then, welding the port board embedded plate 21 and the starboard board embedded plate 22 with the hull plate completely according to the requirements of relevant drawings; removing the welding seam defect section by using a carbon arc gouging or batch chiseling, not allowing to perform melting removal by using an electric arc or gas flame, and performing weld repair after the defect is removed and a proper groove is formed; forming a proper groove according to the defect condition of the welding seam, wherein the groove does not allow any welding seam defect to continuously exist, burrs and dents are not allowed to exist, and the bottom of the groove is semicircular and is not allowed to form a sharp angle shape; before repair welding, the groove and two sides are cleaned carefully within 30mm, and dirt including rust, oxide skin, moisture and oil dirt is removed; preheating is needed before repairing the weld defects of the weld joint with the preheating requirement and the part with large restraint intensity; after the defects of the welding seams are removed, repair welding is carried out by adopting manual welding, submerged arc automatic welding or gas shielded welding; after welding, a welder performs self-inspection on the welding seam, eliminates appearance defects according to requirements, reports a process and an inspector if the welding seam is found, eliminates the welding seam after the process and the inspector carry out the appearance inspection on the welding seam and measure the appearance size of the welding seam, and records and files the welding position and the quality condition of the welder; the welding quality and the tightness of the welding seam are qualified by the inspection of an inspection department.

S4: and detecting flaws after the outer plate is embedded and repaired.

The inspectors engaged in the ultrasonic inspection must master the basic technology of ultrasonic inspection, have enough experience of ultrasonic inspection of the weld, and master certain basic knowledge about materials and welding specialties. The ultrasonic welding seam inspector is strictly trained and examined according to the regulations or technical conditions, holds a grade certificate issued by a corresponding examination organization and carries out the inspection work of a corresponding examination project. The equipment has various technical requirements on equipment such as instruments, probes, test blocks and the like.

The echo height area division is shown in table 1.

TABLE 1

Range of echo height	Echo height area
		L line or less than L line	Ⅰ
Above L line to M line	Ⅱ
		Above M line to H line	Ⅲ
Above H line	Ⅳ

The ultrasonic probe moving area should remove welding spatter, scrap iron, oil stains and other external impurities. The flaw detection surface is smooth, so that the probe can be conveniently and freely scanned, and the flaw detection surface is polished when necessary. The ultrasonic flaw detection of the welding seam should be carried out after 48 hours of welding. The detection results are graded according to the specification of table 2 according to the echo height area and the defect indication length. When the detection is carried out from two aspects, if the same defect grade division is different, the grade division of one grade is needed to be selected.

TABLE 2 Defect grade by echo height area and Defect indicator Length (Unit: mm)

Wherein t is the thickness of the base material on the side of the notch. In the case of butt welding, if the thicknesses of the base materials are not the same, t is the thickness of the base material on the thinner side. l is the defect indication length. The ultrasonic flaw detection result is qualified in grade 3. And the flaw detector judges the flaw to be unqualified according to the experience that the flaw is a harmful defect such as crack, incomplete fusion, incomplete penetration and the like. All unqualified welding seams should be repaired according to the regulations.

Further, when the determination criteria of table 2 are adopted, at the same depth, the defect-to-defect pitch is smaller than the indicated length of the longer defect therein, and can be regarded as the same defect, including the intervals thereof together as defect treatment. Defects and defect spacings are larger than the longer defect indicator length thereof and can be considered as independent defects.

S5: and (6) installing a new base.

And S5-1, after the new base and the outer plate are welded and polished, the welding quality and the tightness of the welding seam are qualified through the inspection of an inspection department.

S5-2, after the welding quality and the tightness of the welding seam are qualified, installing a guide plate of the base of the welding depth gauge, and after the guide plate is installed and welded, polishing the welding seam to enable the guide plate to be in smooth transition with the outer plate. The method specifically comprises the following steps:

a) Before the bases of the depth sounder and the Doppler log are installed, the fore-aft line of the ship body at the base is marked in advance according to a centering mark plate in a cabin of the depth sounder, wherein the deviation between the fore-aft line of the base of the Doppler log and the fore-aft line of the ship body is not more than 0.5 degrees.

b) When the bases of the depth sounder and the Doppler log are installed, the lower plane of the base is preferably flush and conformal with the outer plate.

c) After the base and the outer plate of the depth finder and the Doppler log are welded, the welding line is polished to be flush and conformal with the outer plate, only a small amount of polishing is allowed to be performed on the base near the welding line during polishing, and the matching surface of the base and the sensor is not allowed to be polished.

d) After the bases of the depth sounder and the Doppler log are welded and polished, the inclination angle of the upper surface of the base is measured and submitted to an equipment service provider, and the equipment service provider corrects the equipment.

S6: and mounting the transducer and the depth sounder.

S6-1, the appearance of the acoustic window of the transducer array 1 is checked first. When marine life is present on the outside, it should be removed. When the paint on the surface falls off, the chlorinated rubber anti-pollution paint is uniformly coated at the falling part for 1 to 2 degrees, and then the paint is installed after being placed for 24 hours at normal temperature. When the surface is stained with oil stain or unclean, the detergent is used for removing the stains. Finally, the water is vertically placed into the gate valve after being cleaned by clear water, and the fore-aft line direction is noticed.

S6-2, replacing a gasket on the valve body and two O-rings 10 on the flange, sleeving the upper flange 8 on the transducer array 1, then sleeving the O-rings 10 and the small sealing flange on the array sheath in sequence, and slowly placing the upper flange 8 at the bottom.

S6-3, clamping the array protection pipe by a half splint, placing the transducer array and the flange assembly on the valve body by a hoisting tool, aligning the upper flange 8 with the stem and stern scribed lines of the ship, and fastening by a fastener (the array sound transmission surface is not allowed to touch the valve body and other hard objects in the whole installation).

S6-4, mounting the small sealing flange, carefully checking the mounting conditions of all places, opening the gate valve after confirming that the sealing performance is good, trying to rotate the valve hand wheel by using a tool when seeing that the pointer at the hand wheel points to the opening scale line, and putting down the transducer matrix after confirming that the valve of the gate valve is completely opened until the scale line on the protective pipe is flush with the end face of the small sealing flange.

S6-5, rotating the Haff clamp plate to align the prow line of the matrix with the line on the valve.

And S6-6, checking the sealing performance of the small sealing flange again.

And S6-7, installing and fastening the half splint.

And S6-8, plugging a cable plug, finishing the installation, and checking the installation condition of each part again.

And S6-9, completing the installation of the depth finder again according to the steps. The installed position is shown in fig. 2-5.

S7: air-tightness test after installation

After the two devices in the cabin are restored, the test can be carried out in three ways; one mode is a cabin air tightness test, the other mode is a partial vacuum test, and the third mode is a welding seam kerosene coating mode.

The method I comprises the following steps: when the cabin reaches a pressure of 0.0294MPa, its duration should be not less than 1 hour. The inspection is carried out after 1 hour, and the detected part of the irrigation test is qualified if no water leakage or water seepage occurs; the soap liquid at the detected part does not generate bubbles in the aeration test, and the qualified product is obtained if the pressure drop in the cabin does not exceed 3 percent of the specified pressure or no obvious pressure drop exists.

The second method comprises the following steps: in the negative pressure test, after the air extraction time is 1-2 seconds, the test can be carried out when the negative pressure of not less than 0.033MPa is obtained. During the test, according to the type of the welding line, only the corresponding device is required to be covered on the welding section which is coated with the soap liquid in advance, and then air is pumped out, so that negative pressure is formed in the cover, and no bubble is generated, so that the product is qualified.

The third method comprises the following steps: the kerosene painting test is only suitable for welding seams, and the time spent by painting kerosene is not less than the time listed in the following table 3 for a single-side welding seam; for a double-sided weld, this should be 2 times the time listed in table 3 below.

In the kerosene coating test, if the ambient temperature is lower than 0 ℃, the tested part should be properly heated and dried, and the test time is 2 times of the time in the table 1. After the action time of the kerosene test specified in the table, the condition that no kerosene spot is found on the surface of the chalk powder brushed on the detected part of the welding line is qualified.

Another technical problem to be solved by the present invention is to provide a preparation work in a dock before docking, namely, an arrangement of a log and an inspection of a docking block, comprising the following steps:

d1: preparation work in the pre-docking bay.

1. Before corrugation is removed, the bottom surface of the dock needs to be cleaned, and a centerline of the bottom of the dock needs to be marked.

2. Arranging the ridges in the dock before docking in place according to requirements, and arranging keel piers and side piers in the hull dock according to a docking ridge wood arrangement diagram.

3. When arranging the central keel pier and the side piers, rib lines are determined. And then, respectively projecting the rib bit line and the center line of the dock bottom to one side of a dock wall bank and the upper surfaces of a dock gate and a dock front end bank by using a laser theodolite, and marking the rib bit line and the center line with marks for correctly positioning a docking block when a ship enters the dock.

4. The center line of the dock keel pier is arranged at the front end rib position and the tail end rib position, and a dock bottom center buoy is arranged for traction and positioning during docking.

a) And (5) checking the contact ratio of the dock bottom central line and the box body central line.

b) And checking the correctness of the rib position and the height size of the keel pier according to the length direction of the ship.

c) The levelness of the upper surface of the keel pier (i.e. the levelness of the ship base line) is checked.

d) And checking the correctness of the center lines of the upper surfaces of one side of the dock wall and the top end of the head and the tail of the dock.

e) The accuracy of the positioning rib marks (square lines) and the pitch sizes of the side piers was checked 7.

f) The line shape of the upper surface of the side pier is checked by using a line type template.

g) And (5) checking the fixing conditions of the upper layer pier and the lower layer pier of the side pier, the connection and the fixation of the upper surface stupefied wood of the center keel pier and the structure.

h) And (5) checking the fixing condition of the central box body structure and the upper edge wood (whether the iron hasp is fastened and is firmly lapped and whether the edge wood is padded or not).

6. Tolerance requirements during inspection (before the iron hasp is fastened).

a) The front and back levelness deviation of the upper surface of the middle keel pier is +/-Xmm.

b) The baseline horizontal deviation of the side pier was ± Xmm.

c) The deviation of the goodness fit between the upper surface line shape of the side pier and the sample plate is +/-Xmm.

d) The deviation between the center of the side pier and the center of the ship body is +/-Ymm.

e) The deviation between the rib position of the side pier and the theoretical rib position is +/-Xmm. (X is 3mm, Y is 2mm)

D2: the arrangement of the wood beams in the dock is worked.

1. When the ship enters the harbor basin channel, the tide level is required to be more than 2.6 m.

2. To ensure the safety of the docking of the ship, the water depth in the dock during docking must be more than about 15 m.

3. The marker set in advance is used for ensuring the accurate positioning of the ship when docking.

4. After the piers are seated, according to the arrangement requirements of the docking arris, the first edge of the head part and the reinforced middle pier on the central road plate, the tail part seat edge high pier or the wood square pillar and the tail end central high pier are quickly positioned and fastened and tamped.

5. And immediately emptying the water in the air guide sleeve after the ship sits on the pier.

In conclusion, the invention provides a restoring method of a Doppler transducer, fills the blank of the ship technology type Doppler transducer restoring technology in the market, provides a restoring method of a ship high-frequency Doppler transducer, solves the problem of inconsistent technical states of equipment arrangement positions caused by the fact that installation positions need to be changed in a depth finder test, and restores the technical states of arrangement positions, installation and the like of initial equipment on a ship. The problem of the technical state of the arrangement position of the same type equipment of a type ship is unanimous is solved.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A restoring method for a doppler transducer, comprising the steps of:

s1: preparing for the original base of the depth finder and the Doppler transducer before cutting;

s2: cutting off an original base;

s3: the inlaying and welding of hull planking specifically includes:

firstly, determining an embedding range, setting a steel material cutting instruction, and cutting a required steel plate material completely according to the size of the cutting instruction; then welding the port and starboard patch plates and the hull plate completely according to the requirements of relevant drawings; removing the welding seam defect section by using a carbon arc gouging or batch chiseling, not allowing to perform melting removal by using an electric arc or gas flame, and performing weld repair after the defect is removed and a proper groove is formed; forming a proper groove according to the defect condition of the welding seam, wherein the groove does not allow any welding seam defect to continuously exist, burrs and dents are not allowed to exist, and the bottom of the groove is semicircular and is not allowed to form a sharp angle shape; before repair welding, the groove and two sides are cleaned carefully within 30mm, and dirt including rust, oxide skin, moisture and oil dirt is removed; preheating the welding line with preheating requirement and the welding line defect at the position with large restraint degree before repairing; after the defects of the welding seams are removed, repair welding is carried out by adopting manual welding, submerged arc automatic welding or gas shielded welding; after welding, a welder performs self-inspection on the welding seam, eliminates appearance defects according to requirements, reports a process and an inspector if the welding seam is found, eliminates the welding seam after the process and the inspector carry out the appearance inspection on the welding seam and measure the appearance size of the welding seam, and records and files the welding position and the quality condition of the welder; the welding quality and the tightness of the welding seam are qualified by the inspection department.

2. Reduction process according to claim 1, characterized in that it further comprises the steps of:

s4: flaw detection after outer plate embedding specifically comprises:

the ultrasonic flaw detection technology is adopted to detect the flaw of the welding seam, welding spatters, scrap iron, oil stains and other external impurities are removed in the moving area of the ultrasonic probe, the flaw detection surface is guaranteed to be flat and smooth, the probe can be conveniently and freely scanned, and the ultrasonic probe can be polished if necessary; the ultrasonic flaw detection of the welding seam is carried out after the welding is finished for 48 hours; grading the detection result according to the echo height area and the defect indication length; when the detection is carried out from two aspects, if the same defect grade division is different, the grade division of the lower grade is selected; at the same depth, the distance between the defect and the defect is smaller than the indicating length of the longer defect, the defect and the defect are regarded as the same defect, the interval of the defect and the defect is taken as the defect treatment together, and the distance between the defect and the defect is larger than the indicating length of the longer defect, and the defect are regarded as independent defects; and (4) judging that the flaw detector is unqualified according to the dangerous defects including cracks, incomplete fusion and incomplete penetration of welding according to experience, and repairing all unqualified welding seams according to the regulations.

3. Reduction process according to claim 2, characterized in that it further comprises the following steps:

S5: the installation of new base specifically includes:

4. A reduction process according to claim 3, further comprising the steps of:

s6: installation of transducer and depth finder specifically includes:

s6-1, firstly, checking the appearance of the transducer array acoustic window, removing marine organisms on the appearance, when the paint on the appearance falls off, uniformly coating 1-2 degrees with chlorinated rubber anti-pollution paint at the falling part, then, placing the transducer array acoustic window at normal temperature for 24 hours, then, installing the transducer array acoustic window, when the paint on the appearance falls off, removing the transducer array acoustic window with detergent when the appearance is stuck with oil stains or is not clean, finally, vertically placing the transducer array acoustic window in a gate valve after being cleaned with clear water, and paying attention to the fore-aft line direction;

S6-5, rotating the half clamp plate to align the stem direction score line of the matrix with the score line on the valve;

s6-6, checking the sealing performance of the small sealing flange again;

s6-7, installing and fastening a half splint;

5. Reduction process according to claim 4, characterized in that it further comprises the following steps:

s7: and the mounted airtight tests comprise a cabin airtight test, a local vacuum test and a weld joint kerosene coating test.

6. A reduction process according to claim 5, wherein said cabin airtightness test is carried out by:

when the cabin reaches the pressure of 0.0294MPa, the duration time is not less than 1 hour, the inspection is carried out after 1 hour, and the water leakage and water seepage phenomena do not occur at the detected part of the irrigation test, so that the cabin is qualified; the soap liquid at the detected part does not generate bubbles in the aeration test, and the qualified product is obtained if the pressure drop in the cabin does not exceed 3 percent of the specified pressure or no obvious pressure drop exists.

7. A reduction process according to claim 5, wherein said partial evacuation test is carried out by:

During a negative pressure test, after air extraction time is 1-2 seconds, when the negative pressure of not less than 0.033MPa is obtained, the test can be carried out, and during the test, according to the type of a welding line, only a corresponding device is required to be covered on a welding section which is coated with soap solution in advance, then air is extracted, so that the negative pressure is formed in the cover, and no air bubble is generated, so that the test is qualified.

8. A reduction process according to claim 5, wherein said weld kerosing test is a process comprising:

the kerosene painting test is suitable for welding seam inspection, and the time for painting kerosene is not less than the specified time for a single-side welding seam; 2 times of the time specified for the double-sided welding seam to be the single-sided welding seam; when the kerosene is brushed for a test, if the environmental temperature is lower than 0 ℃, the part to be detected is properly heated and dried, and after the kerosene test for a set time, the chalk powder brushed on the part to be detected of the welding line is qualified if no kerosene spot is found on the surface.

9. The method of claim 1, further comprising a preparation prior to docking, comprising:

1. before corrugation is removed, the bottom surface of the dock needs to be cleaned, and a central line of the bottom of the dock needs to be marked;

2. arranging the docking front dock internal ridges in place according to requirements, and arranging hull dock internal keel piers and side piers according to a docking ridge wood arrangement diagram;

5. the inspection of the docking blocks comprises the inspection of a keel block at the middle part and a side block at the side part

c) checking the levelness of the upper surface of the keel pier;

e) checking 7 the correctness of the positioning rib number and the distance middle size of the side pier;

6. Tolerance requirements at inspection

b) the horizontal deviation of the base line of the side pier is +/-3 mm;

10. A reduction method according to claim 9, characterized in that said preparation work further comprises:

d2: arrangement work of wood beams in dock