Quick-release support device for a column-type jig and method of use

Abstract

This invention discloses a quick-release support device for a pillar-type jig, comprising an electrically controlled permanent magnet device, a top cover, a ball sleeve, a ball head, a support rod, a collar, and a connecting piece. The ball sleeve is a stepped cylinder with external threads of different diameters, and a countersunk hole at the smaller diameter end. The ball head is placed in the countersunk hole, and the ball head protrudes from the spherical surface of the countersunk hole to connect with the support rod. The ball sleeve is screwed onto the smaller diameter external thread of the top cover. One end of the collar has an inner thread, and the other end has at least three equally spaced U-shaped notches, which are screwed onto the larger diameter external thread of the top cover with the notches facing upwards. The electrically controlled permanent magnet device is fixed in the center of the upper plane of the top cover. The connecting piece is embedded in the U-shaped notches of the collar, with one end pressing against the electrically controlled permanent magnet device and the other end extending out of the collar. The quick-release support device of this invention is easy to install, can be quickly replaced, effectively improves the efficiency of segmented construction, and significantly increases the adjustable range of the jig support height.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, and in particular relates to a quick-release support device for a pillar-type jig and its usage method. Background Technology

[0002] To ensure the correct alignment of hull sections and control welding deformation during construction, numerous jigs are needed to support them. These jigs mainly include template-type, frame-type, and pillar-type jigs. Template-type and frame-type jigs are often welded to fit the shape of individual sections, lacking versatility and requiring repeated dismantling or reconstruction when constructing different sections, resulting in wasted labor and materials. Pillar-type jigs, on the other hand, form a working surface through the curved surface created by the apexes of numerous pillars, allowing them to adapt to the construction needs of different sections to a certain extent, possessing some versatility and promising development prospects. However, the adjustable range of the support height for this type of jig is limited, and its connection to the section generally relies solely on gravity and friction, making it unreliable to control the self-weight deformation and welding deformation of the hull sections during construction. Therefore, pillar-type jigs are generally not suitable for constructing sections with large curvatures or thin plates, limiting their application. Currently, rigid fixing is a common method used by shipyards to control hull deformation during sectional construction. It involves fixing hull sections to the jig using various assembly fixtures or temporary pullers, reducing self-weight deformation and welding deformation during construction. However, directly welding the jig to the hull section severely damages the jig itself and makes replacement difficult in case of failure. Therefore, there is a need to design a support device for the strut-type jig that can reliably connect hull sections to the strut-type jig, and is easy to reuse and quickly replace. This would achieve rigid fixing of the hull sections, improve the support accuracy of the strut-type jig for the sections, and thus broaden the application range of the strut-type jig. Summary of the Invention

[0003] The purpose of this invention is to provide a quick-release support device for a pillar-type jig, which overcomes the shortcomings of existing pillar-type jigs in terms of low reliability of connection with hull sections and inability to effectively control self-weight deformation and welding deformation during the construction of hull sections. It can achieve rigid fixation of hull sections, improve the support accuracy of the pillar-type jig for the sections, and thus broaden its application range.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A quick-release support device for a pillar-type jig frame comprises an electrically controlled permanent magnet device 21, a top cover 22, a ball sleeve 23, a ball head 24, a support rod 25, a collar 12, and a connecting piece 11. The ball sleeve 23 is a stepped cylinder with external threads of different diameters. A countersunk hole is formed at the smaller diameter end. The ball head 24 is placed in the countersunk hole and connects to the support rod 25 on the spherical surface of the ball head 24 protruding from the countersunk hole. The ball sleeve 23 is screwed onto the smaller diameter external thread of the top cover 22. One end of the collar 12 has an inner thread, and the other end has at least three U-shaped notches 121 evenly formed on its end face. The notches face upwards and it is screwed onto the larger diameter external thread of the top cover 22. The electrically controlled permanent magnet device 21 is fixed to the center of the upper plane of the top cover 22. The connecting piece 11 is embedded in the U-shaped notches 121 of the collar 12, with one end pressing against the electrically controlled permanent magnet device 21 and the other end extending out of the collar 12.

[0006] In a further preferred embodiment, the U-shaped notch 121 of the collar 12 is also provided with a guide groove 122 or a chamfer for guiding the connecting piece 11 into the U-shaped notch 121.

[0007] Further preferably, the connecting piece 11 is a series of sheet-like metal blocks with an upper end face that is horizontally straight, inclined straight, or arc-shaped.

[0008] Further preferably, the support rod 25 is a series of solid cylindrical rods with external threads at both ends, an internal thread at one end that mates with the external thread at the other end, and a polygonal face in the middle, and varying lengths.

[0009] Further preferably, the ball sleeve 23 is funnel-shaped, with an outlet diameter smaller than the diameter of the ball head 24.

[0010] Further preferably, the bottom surface of the countersunk hole of the top cover 22 is an arc surface.

[0011] In a further preferred embodiment, the width of the U-shaped notch 121 of the collar 12 is smaller than the thickness of the connecting piece 11, and it is connected to the connecting piece 11 by an interference fit.

[0012] To achieve the above objectives, another technical solution adopted by the present invention is as follows:

[0013] A method for using a quick-release support device for a pillar-type jig includes a method for supporting and fixing hull sections and a method for quick disassembly.

[0014] I. Methods for supporting and securing ship hull sections, including the following steps:

[0015] A1. Based on the design model of the hull section outer plate, perform data fitting on the curved surface of the section outer plate, and then calculate the expected support height of each support frame by combining the support position of each support frame. When the height exceeds the adjustable range of the support height of the support frame, select one or more suitable support rods 25 and connect them to the support frame through threads to expand the support height of each support frame.

[0016] A2. Install the ball head 24 into the ball sleeve 23, and then rigidly connect the support rod 25 to the ball head 24, the top cover 22 to the ball sleeve 23, and the top cover 22 to the electro-controlled permanent magnet device 21 through threads. Then, thread the top cover 22 to the collar 12 so that the upper edge of the collar 12 is flush with the upper edge of the electro-controlled permanent magnet device 21. Finally, repeat this step to complete the installation of the quick-release support device on all the pillar-type jigs.

[0017] A3. Adjust the support height of each jig to the desired support height. The upper edge of the quick-release support device on each pillar jig can be combined to form the curved shape of the hull section outer plate. When placing the hull section outer plate, under the gravity of the hull section outer plate, the ball head 24 and the ball sleeve 23 will rotate adaptively, so that the electro-controlled permanent magnet device 21 can effectively contact the hull section outer plate. The electro-controlled permanent magnet device 21 provides a pulse current, so that it exhibits magnetic attraction force externally, thereby fixing it to the hull section outer plate.

[0018] A4. Based on the shape of the outer plate of the hull section at the support position, select a suitable connecting piece 11 and use a hammer or other tools to hammer it into the U-shaped notch 121 of the collar 12 along the outer guide groove, so that the front end of the connecting piece 11 abuts against the side edge of the electro-controlled permanent magnet device 21, and spot weld the connecting piece 11 to the outer plate of the hull section, thereby strengthening the connection between the support frame and the outer plate of the hull section and preventing the slippage between the outer plate of the hull section and the electromagnetic adsorption device 21.

[0019] II. Quick disassembly method, including the following steps:

[0020] B1. For all quick-release support devices on the support frame, the electro-controlled permanent magnet device 21 provides a pulse current so that it does not generate magnetic attraction externally, thereby separating it from the outer plate of the hull section.

[0021] B2. The hull sections are lifted by a crane, and the connecting piece 11 is directly disengaged from the U-shaped notch 121 of the collar 12, thus quickly completing the disassembly of all the jigs.

[0022] A method for using a quick-release support device for a pillar-type jig, further comprising a method for disassembling and replacing a damaged quick-release support device, the steps of which are:

[0023] C1. The electrically controlled permanent magnet device 21 provides a pulse current so that it does not generate magnetic attraction externally, thereby separating it from the outer plate of the hull section.

[0024] C2. Lower the support height of the support frame so that the connecting piece 11 is disengaged from the U-shaped notch 121 of the collar 12, and the weight of the outer plate of the hull section is shared by the adjacent support frames.

[0025] C3. After replacing the damaged parts as needed, adjust the support height of the support frame to the point that the collar 12 is close to the connecting piece 11 on the outer plate of the hull section. Then rotate the ball head 24 and the ball sleeve 23 so that the U-shaped notch 121 on the collar 12 is aligned with the connecting piece 11.

[0026] C4. Increase the support height of the support frame so that the connecting piece 11 is inserted into the U-shaped notch 121 on the collar 12 along the top side guide groove 122. Continue to increase the support height of the support frame until the electro-controlled permanent magnet device 21 is in effective contact with the outer plate of the hull section.

[0027] C5. The electrically controlled permanent magnet device 21 provides a pulse current, which makes it exhibit magnetic attraction, thereby fixing it to the outer plate of the hull section. Finally, the support height of the support frame is adjusted to the position before disassembly.

[0028] Compared with the prior art, the significant advantages and beneficial effects of this invention are as follows:

[0029] 1. It realizes the fixed connection between the support frame and the hull section, which can effectively control the self-weight deformation and welding deformation during the construction of the hull section, improve the construction accuracy of the section, facilitate the modification of the existing support frame, and effectively broaden its application range.

[0030] 2. The quick-release support device of the present invention is connected by electromagnetic adsorption, thread or interference fit, and will not damage the main body of the pillar type jig during use. It is highly versatile, reusable, and meets the industry development requirements of green manufacturing.

[0031] 3. The quick-release support device of the present invention achieves the adsorption of permanent magnets on the outer plate of the ship through an electrically controlled permanent magnet device. The adsorption force is large and the loss is small. The charging and demagnetizing are controlled by pulse current, which is extremely fast and meets the working requirements.

[0032] 4. Compared to traditional welding connection methods, the quick-release support device of this invention is easy to install and can be quickly disassembled and replaced, effectively improving the efficiency of segmented construction. Furthermore, it significantly increases the adjustable range of the jig support height. Attached Figure Description

[0033] Figure 1 This is a structural cross-sectional view of the quick-release support device of the present invention;

[0034] Figure 2 This is a structural schematic diagram of the quick-release support device of the present invention;

[0035] Figure 3 This is a schematic diagram of the ball sleeve in this invention;

[0036] Figure 4 This is a schematic diagram of the top cover structure in this invention;

[0037] Figure 5 This is a schematic diagram of the collar structure in this invention;

[0038] Figure 6 This is a schematic diagram of the connecting piece in this invention;

[0039] Figure 7 This is a schematic diagram of the support rod structure in this invention;

[0040] Figure 8 This is a schematic diagram illustrating the working principle of the present invention.

[0041] Among them, 11 is the connecting piece, and 12 is the collar.

[0042] 21 is the electrically controlled permanent magnet device, 22 is the top cover, 23 is the ball sleeve, 24 is the ball head, and 25 is the support rod.

[0043] 111 is a horizontal straight line, 112 is a slanted straight line, and 113 is an arc.

[0044] 121 is a U-shaped notch, and 122 is a guide groove.

[0045] 251 is support rod type one, 252 is support rod type two, and 253 is a combined support rod. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figure 1 , 2 As shown, a quick-release support device for a pillar-type jig frame according to the present invention consists of an electrically controlled permanent magnet device 21, a top cover 22, a ball sleeve 23, a ball head 24, a support rod 25, a collar 12, and a connecting piece 11.

[0048] like Figure 3 , 4As shown, the ball sleeve 23 is a stepped cylinder with different diameters and external threads. A countersunk hole is opened at the smaller diameter end, and the ball sleeve 23 is funnel-shaped with an outlet diameter smaller than the diameter of the ball head 24. The ball head 24 is placed in the countersunk hole, and the ball head 24 is connected to the support rod 25 on the spherical surface of the countersunk hole. The ball sleeve 23 is screwed onto the small-diameter external thread of the top cover 22. The bottom surface of the countersunk hole of the top cover 22 is an arc surface.

[0049] The electrically controlled permanent magnet device 21 is fixedly installed in the center of the upper plane of the top cover 22. It can control the magnitude and direction of the magnetic attraction force through pulse current. During normal operation, the electrically controlled permanent magnet device 21 generates magnetic attraction force to the outside, thereby connecting with the outer plate of the ship to achieve a fixed connection and suppress the warping of the outer plate of the hull section. When disassembly is required, demagnetization is completed by using pulse current, and the electrically controlled permanent magnet device 21 does not generate magnetic attraction force to the outside.

[0050] like Figure 5 As shown, four U-shaped notches 121 are evenly formed on one end face of the collar 12 for inserting the connecting piece 11, which ensures that the connecting piece 11 will not slide out laterally from the U-shaped notches 121 regardless of the posture of the collar 12; the U-shaped notches 121 of the collar 12 are also provided with guide grooves 122 or chamfers to guide the connecting piece 11 into the U-shaped notches 121; the inner circle of the other end of the collar 12 is provided with threads, and the collar 12 is screwed onto the large-diameter outer thread of the top cover 22 with the notch facing upward to achieve a rigid connection.

[0051] The connecting piece 11 is embedded in the U-shaped notch 121 of the collar 12, with one end pressing against the electrically controlled permanent magnet device 21 and the other end extending out of the collar 12. Its thickness is greater than the width of the U-shaped notch 121 of the collar 12, and it is connected to the collar 12 by an interference fit; Figure 6 As shown, the connecting piece 11 is a series of sheet-like metal blocks with horizontal straight lines 111, inclined straight lines 112, or arc-shaped upper surfaces 113, which can be pre-cut according to the actual shape of the ship hull section outer plate; the connecting piece 11 is welded to the ship hull section outer plate, which can strengthen the connection between the support frame and the ship hull section outer plate and suppress the sliding between the ship hull section outer plate and the electro-controlled permanent magnet device 21.

[0052] like Figure 7 As shown, the support rod 25 is a series of solid cylindrical rods with external threads at both ends, an internal thread at one end that mates with the external thread at the other end, and a polygonal face in the middle, and of varying lengths. Examples include support rod type 1 251 and support rod type 2 252. The support rod 25 is fixedly connected to the ball head 24 and the support frame through the external threads at both ends, respectively. Multiple support rods 25 can also be spliced ​​and lengthened through threads to obtain a combined support rod 253 to adapt to different support height requirements and significantly increase the adjustable range of the support height of the frame.

[0053] like Figure 8 As shown, the steps for supporting and fixing the hull sections based on the present invention include:

[0054] First, based on the design model of the hull section outer plate, data fitting is performed on the curved surface of the section outer plate. Then, combined with the support position of each support frame, the expected support height of each frame is calculated. When the height exceeds the adjustable range of the support height of the support frame, one or more suitable support rods 25 are selected and connected to the support frame through threads to extend the support height of each frame.

[0055] Then, install the ball head 24 into the ball sleeve 23, and rigidly connect the support rod 25 to the ball head 24, the top cover 22 to the ball sleeve 23, and the top cover 22 to the electro-controlled permanent magnet device 21 through threads. Then, thread the top cover 22 to the collar 12 so that the upper edge of the collar 12 is flush with the upper edge of the electro-controlled permanent magnet device 21. Finally, repeat this step to complete the installation of the quick-release support device on all the pillar-type jigs.

[0056] Secondly, adjust the support height of each jig to the desired support height. The upper edge of the quick-release support device on each pillar jig can be combined to form the curved shape of the hull section outer plate. When the hull section outer plate is placed, under the gravity of the hull section outer plate, the ball head 24 and the ball sleeve 23 will rotate adaptively, so that the electro-controlled permanent magnet device 21 can effectively contact the hull section outer plate. The electro-controlled permanent magnet device 21 provides a pulse current, so that it exhibits magnetic attraction force externally, thereby fixing it to the hull section outer plate.

[0057] Finally, based on the shape of the outer plate of the hull section at the support position, a suitable connecting piece 11 is selected, and it is hammered into the U-shaped notch 121 of the collar 12 along the outer guide groove with a hammer or other tools, so that the front end of the connecting piece 11 abuts against the side edge of the electro-controlled permanent magnet device 21, and the connecting piece 11 is spot welded to the outer plate of the hull section, thereby strengthening the connection between the support frame and the outer plate of the hull section and preventing the slippage between the outer plate of the hull section and the electromagnetic adsorption device 21.

[0058] After the hull sections are constructed, the steps for quickly disassembling the support device based on this invention include:

[0059] For all quick-release support devices on the support frame, the electro-controlled permanent magnet device 21 provides a pulse current so that it does not generate magnetic attraction externally, thus allowing it to be separated from the outer plate of the hull section; the hull section is lifted by the crane, and the serialized connecting piece 11 is directly disengaged from the U-shaped notch 121 of the collar 12, thus quickly completing the disassembly of all support frames.

[0060] In addition, when the quick-release support device on a single pillar-type jig is damaged, the quick removal and replacement steps include:

[0061] First, the electronically controlled permanent magnet device 21 provides a pulse current so that it does not generate magnetic attraction externally, thereby separating it from the outer plate of the hull section.

[0062] Then, the support height of the support frame is lowered so that the connecting piece 11 is disengaged from the U-shaped notch 121 of the collar 12, and the weight of the outer plate of the hull section is shared by the adjacent support frames.

[0063] Secondly, after replacing the damaged parts as needed, adjust the support height of the support frame to the point that the collar 12 is close to the connecting piece 11 on the outer plate of the hull section. Then rotate the ball head 24 and the ball sleeve 23 so that the U-shaped notch 121 on the collar 12 is aligned with the connecting piece 11.

[0064] Secondly, the support height of the support frame is increased so that the connecting piece 11 is inserted into the U-shaped notch 121 on the collar 12 along the top guide groove 122. The support height of the support frame is further increased until the electro-magnet device 21 is in effective contact with the outer plate of the hull section.

[0065] Finally, the electrically controlled permanent magnet device 21 provides a pulse current, which makes it exhibit magnetic attraction, thereby fixing it to the outer plate of the hull section and adjusting the support height of the support frame to the position before disassembly.

[0066] This invention discloses a quick-release support device and its usage method for a pillar-type jig. It primarily uses electromagnetic adsorption to fix the pillar-type jig to the ship's segmented outer plating. Simultaneously, an interference fit is designed between the connecting piece 11 and the U-shaped notch 121 on the collar 12 to accommodate sliding between the large-radius or thin-plate ship segmented outer plating and the electrically controlled permanent magnet device 21. Therefore, this invention can effectively control the deformation of the segmented outer plating due to its own weight and welding deformation, broadening the application range of existing pillar-type jigs, and facilitating disassembly. Furthermore, this invention only welds the connecting piece 11 to the ship's outer plating, without damaging the pillar-type jig or the main body of the support device. When the segment is completed or the shape of the ship's segmented outer plating changes, only the low-cost connecting piece 11 needs to be cut and replaced. The collar 12 and the top cover 22 are connected by threads, allowing for low-cost and quick replacement. Therefore, all components in this invention, except for the connecting piece 11, are reusable, resulting in a high degree of reusability.

Claims

1. A quick-release support device for a pillar-type jig, comprising an electrically controlled permanent magnet device (21), a top cover (22), a ball sleeve (23), a ball head (24), a support rod (25), a collar (12), and a connecting piece (11), wherein the ball sleeve (23) is a stepped cylinder with internal threads of different diameters, and a countersunk hole is provided at the smaller diameter end; the ball head (24) is placed in the countersunk hole, and the ball head (24) protrudes from the spherical surface of the countersunk hole and connects to the support rod (25), characterized in that: The ball sleeve (23) is screwed onto the small-diameter outer thread of the top cover (22); the inner circle of one end of the collar (12) is threaded, and at least three U-shaped notches (121) are equally opened on the end face of the other end, and the notches are screwed onto the large-diameter outer thread of the top cover (22); the electrically controlled permanent magnet device (21) is fixed in the center of the upper plane of the top cover (22); the connecting piece (11) is embedded in the U-shaped notch (121) of the collar (12), with one end pressing against the electrically controlled permanent magnet device (21) and the other end extending out of the collar (12).

2. The quick-release support device for a pillar-type jig according to claim 1, characterized in that: The U-shaped notch (121) of the collar (12) is also provided with a guide groove (122) or a chamfer for guiding the connecting piece (11) to be inserted into the U-shaped notch (121).

3. The quick-release support device for a pillar-type jig according to claim 1, characterized in that: The connecting piece (11) is a series of sheet-like metal blocks with horizontal straight lines, inclined straight lines, or arcs on their upper surfaces.

4. The quick-release support device for a pillar-type jig according to claim 1, characterized in that: The support rod (25) is a series of solid cylindrical rods with external threads at both ends, an internal thread at one end that matches the external thread at the other end, a polygonal face at the middle end, and varying lengths.

5. A quick-release support device for a pillar-type jig according to claim 1, characterized in that: The ball sleeve (23) is funnel-shaped, and the outlet diameter is smaller than the diameter of the ball head (24).

6. The quick-release support device for a pillar-type jig according to claim 1, characterized in that: The bottom surface of the countersunk hole of the top cover (22) is an arc surface.

7. A quick-release support device for a pillar-type jig according to claim 1, characterized in that: The width of the U-shaped notch (121) of the collar (12) is smaller than the thickness of the connecting piece (11), and it is connected to the connecting piece (11) by an interference fit.

8. A method of using the quick-release support device for a pillar-type jig as described in any one of claims 1-7, characterized in that: This includes methods for supporting and fixing hull sections and methods for quick disassembly; I. Methods for supporting and securing ship hull sections, including the following steps: A1. Based on the design model of the hull section outer plate, the data of the section outer plate surface is fitted, and then the expected support height of each support frame is calculated in combination with the support position of each support frame. When the height exceeds the adjustable range of the support height of the support frame, one or more suitable support rods (25) are selected and connected to the support frame through threads to expand the support height of each support frame. A2. Install the ball head (24) into the ball sleeve (23), and then rigidly connect the support rod (25) to the ball head (24), the top cover (22) to the ball sleeve (23), and the top cover (22) to the electric permanent magnet device (21) through threads. Then connect the top cover (22) to the collar (12) with threads so that the upper edge of the collar (12) is flush with the upper edge of the electric permanent magnet device (21). Finally, repeat this step to complete the installation of quick-release support devices on all pillar-type jigs. A3. Adjust the support height of each jig to the desired support height. The upper edge of the quick-release support device on each pillar jig can be combined to form the curved shape of the hull section outer plate. When the hull section outer plate is placed, under the gravity of the hull section outer plate, the ball head (24) and the ball sleeve (23) will rotate adaptively, so that the electric permanent magnet device (21) can effectively contact the hull section outer plate. The electric permanent magnet device (21) provides a pulse current, so that it exhibits magnetic attraction force externally, thereby being fixedly connected to the hull section outer plate. A4. Based on the shape of the outer plate of the hull section at the support position, select a suitable connecting piece (11) and use a hammer or other tools to hammer it into the U-shaped notch (121) of the collar (12) along the outer guide groove, so that the front end of the connecting piece (11) abuts against the side edge of the electro-controlled permanent magnet device (21), and spot weld the connecting piece (11) to the outer plate of the ship section, thereby strengthening the connection between the support frame and the outer plate of the hull section and preventing the slippage between the outer plate of the ship section and the electromagnetic adsorption device (21); II. Quick disassembly method, including the following steps: B1. For all quick-release support devices on the support frame, the electro-controlled permanent magnet device (21) provides a pulse current so that it does not generate magnetic attraction externally, thereby separating it from the outer plate of the hull section. B2. The hull sections are lifted by a crane, and the connecting piece (11) is directly disengaged from the U-shaped notch (121) of the collar (12), thus quickly completing the disassembly of all the jigs.

9. The method of using the quick-release support device for a pillar-type jig according to claim 8, characterized in that: It also includes a method for disassembling and replacing damaged quick-release support devices, the steps of which are: C1. The electrically controlled permanent magnet device (21) provides a pulse current so that it does not generate magnetic attraction to the outside, thereby separating it from the outer plate of the hull section. C2. Lower the support height of the support frame so that the connecting piece (11) is disengaged from the U-shaped notch (121) of the collar (12) and the weight of the outer plate of the hull section is shared by the adjacent support frames. C3. After replacing the damaged parts as needed, adjust the support height of the support frame to the point that the collar (12) is close to the connecting piece (11) on the outer plate of the hull section. Then rotate the ball head (24) and the ball sleeve (23) so that the U-shaped notch (121) on the collar (12) is aligned with the connecting piece (11). C4. Increase the support height of the support frame so that the connecting piece (11) is inserted into the U-shaped notch (121) on the collar (12) along the top side guide groove (122). Continue to increase the support height of the support frame until the electric permanent magnet device (21) is in effective contact with the outer plate of the hull section. C5. The electrically controlled permanent magnet device (21) provides a pulse current, which makes it exhibit magnetic attraction to the outside, thereby fixing it to the outer plate of the hull section. Finally, the support height of the support frame is adjusted to the position before disassembly.

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