A rear axle hub end face plugging device

Abstract

The application discloses a rear axle hub end face plugging device, which comprises a circular sealing plate, the circular sealing plate is provided with a first surface and a second surface which are oppositely arranged along a first direction, the second surface is used for plugging a stern shaft hole on the rear axle hub end face; a plurality of fixing assemblies, the fixing assembly comprises a first magnetic attraction piece, a second magnetic attraction piece and a connecting cross beam, the first magnetic attraction piece and the second magnetic attraction piece are arranged at intervals on the same side of the connecting cross beam; and the plurality of fixing assemblies are arranged at intervals along the circumference of the circular sealing plate, wherein the first magnetic attraction piece is used for adsorbing the outer surface of the rear axle hub, and the second magnetic attraction piece is used for adsorbing the first surface of the circular sealing plate. Thus, the application solves the problem of high loading and unloading difficulty of the existing rear axle hub end face plugging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship, in particular to a rear shaft hub end face plugging device. BACKGROUND

[0002] In the process of modern shipbuilding, in order to improve the utilization rate of shipbuilding dock and shorten the ship loading and closing construction period, there is often a demand for half-ship floating construction, that is, the ship engine room and part of the cargo hold area are first loaded and closed upward in the tail area of the dock, forming a stern half-ship, and then the whole ship is loaded and closed in the head area of the dock, and other processes are completed (when the ship can be docked) and the stern half-ship is floated forward and loaded and closed with the remaining bow section to form a whole ship, and the tail area of the dock continues to load and close the new stern half-ship to form a rolling loading and closing mode, improving the efficiency of ship loading and closing construction. Because the stern shaft of the stern half-ship has not been installed during the loading and closing stage, the stern shaft hole cannot be closed, and the stern shaft hole is in the waterline area, so when floating, water will enter the engine room area through the stern shaft hole, causing the engine room area to be contaminated by water or even unable to float. Therefore, the end face of the rear shaft hub needs to be temporarily plugged before the stern half-ship is floated to prevent water from entering the engine room area.

[0003] The prior art is to install a certain number of 7-shaped clamps on the outer surface of the rear shaft hub, and to form pressure on the rear shaft hub end plate by tightening the bolts on the 7-shaped clamps, thereby achieving the water-tight requirement of the rear shaft hub end face. The fixed 7-shaped clamps need to be welded to the surface of the rear shaft hub, and the construction process is complex, the construction period is long, and the existing rear shaft hub end face plugging has the problem of high installation and removal difficulty. SUMMARY

[0004] The present application provides a rear shaft hub end face plugging device, which aims to solve the problem of high installation and removal difficulty of the existing rear shaft hub end face plugging.

[0005] To solve the above problems, the present application provides a rear shaft hub end face plugging device, a circular end plate, the circular end plate has a first face and a second face arranged opposite in a first direction, the second face is used to plug the stern shaft hole on the end face of the rear shaft hub, a plurality of fixing assemblies are arranged at intervals along the circumference of the circular end plate, the fixing assembly includes a first magnetic attraction piece, a second magnetic attraction piece and a connecting beam, the first magnetic attraction piece and the second magnetic attraction piece are arranged at intervals on the same side of the connecting beam, wherein the first magnetic attraction piece is used to attract the outer surface of the rear shaft hub, and the second magnetic attraction piece is used to attract the first face of the circular end plate.

[0006] In an embodiment, the fixing assembly further comprises a first limiting piece and a pressing bolt, the connecting beam is provided with a mounting hole, the first limiting piece is located between the first magnetic member and the second magnetic member, the mounting hole is located between the first limiting piece and the first magnetic member, and when the fixing assembly is installed, the pressing bolt passes through the mounting hole and contacts the first surface, and pushes the circular sealing plate to move away from the connecting beam, so that the circular sealing plate moves away from the first limiting piece.

[0007] In an embodiment, the fixing assembly further comprises a connecting spring, two ends of the connecting spring are connected to the second magnetic member and the connecting beam respectively, the connecting spring has an initial position and an elongated position, when the connecting spring is in the initial position, the sum of the distances in the first direction extended by the connecting spring and the second magnetic member is less than the distance in the first direction extended by the first limiting piece, so that when the first limiting piece contacts the circular sealing plate, the connecting spring is in the elongated position.

[0008] In an embodiment, the fixing assembly further comprises a sleeve, the sleeve is sleeved outside the connecting spring, one end of the sleeve is fixed to the connecting beam, and the length of the sleeve is not greater than the length of the connecting spring in the initial position.

[0009] In an embodiment, one end of the pressing bolt close to the circular sealing plate is provided in a hemispherical shape.

[0010] In an embodiment, the first surface of the circular sealing plate is further provided with an annular reinforcing plate, the distance in the first direction extended by the annular reinforcing plate is less than the distance in the first direction extended by the first limiting piece, and when the fixing assembly is installed, the annular reinforcing plate is located between the first magnetic member and the pressing bolt.

[0011] In an embodiment, the second surface of the circular sealing plate is provided with an annular sealing strip, during installation of the rear shaft hub end face sealing device, the annular sealing strip is deformed by being pressed by the rear shaft hub end face, so as to seal the stern shaft hole.

[0012] In an embodiment, the second surface of the circular sealing plate is further provided with a second limiting piece, the second limiting piece is arranged between the annular sealing strip and the outer periphery of the circular sealing plate, the height of the second limiting piece is less than the height of the annular sealing strip, and during installation of the rear shaft hub end face sealing device, the annular sealing strip is pressed by the rear shaft hub end face until the second limiting piece and the rear shaft hub end face abut.

[0013] In an embodiment, the distance between the annular reinforcing plate and the outer periphery of the circular sealing plate is a, the distance between the second limiting member and the outer periphery of the circular sealing plate is b, and the distance between the mounting hole and the first magnetic member is c, wherein 5mm≤a≤10mm, 5mm≤b≤10mm, and c≥30mm.

[0014] In an embodiment, the annular reinforcing plate is discontinuously welded to the circular sealing plate in a staggered symmetrical manner.

[0015] In an embodiment, the first surface is further provided with a lifting ring.

[0016] In an embodiment, the first magnetic member and the second magnetic member are each provided with a switch for controlling the adsorption force of the first magnetic member and the second magnetic member.

[0017] In an embodiment, the side of the first magnetic member facing the outer surface of the rear axle hub is provided in a circular arc shape.

[0018] The present application provides a rear axle hub end face sealing device, which has a circular sealing plate and a plurality of fixing assemblies, the fixing assemblies including a first magnetic member, a second magnetic member, and a connecting beam, the first magnetic member and the second magnetic member being arranged in a spaced manner along the same side of the connecting beam; a plurality of the fixing assemblies are arranged in a spaced manner along the circumference of the circular sealing plate, wherein the first magnetic member is used for adsorbing the outer surface of the rear axle hub, and the second magnetic member is used for adsorbing the first surface of the circular sealing plate. In this way, the fixing assemblies connect the circular sealing plate and the rear axle hub end face sealing device together by magnetic attraction, without the need for complex welding construction process, thereby solving the problem of high difficulty in disassembly of the existing rear axle hub end face sealing device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of the rear axle hub of the existing ship;

[0020] Figure 2 is Figure 1 is a sectional view of the rear axle hub along the A-A direction in

[0021] Figure 3 is Figure 1 is a rear axle hub end face view of the rear axle hub along the B-B direction in

[0022] Figure 4 is a structural schematic view of an embodiment of the rear axle hub sealing device of the present application;

[0023] Figure 5 is a structural schematic view of the first surface of the circular sealing plate in the present application; Figure 4

[0024] Figure 6 is​Figure 4 side view of the circular sealing plate in Fig. 1;

[0025] Figure 7 is a schematic view of part of the structure of the fixed assembly after installation.

[0026] Reference Name Reference Name 100 Rear axle hub plugging device 200 Rear axle hub 201 Rear axle hub end face 202 Rear axle hub outer surface 203 Connecting surface 10 Circular sealing plate 11 First limiting piece 12 Annular reinforcing plate 13 Lifting ring 14 Annular sealing strip 15 Second limiting piece 20 Fixing assembly 21 First magnetic attraction piece 22 Second magnetic attraction piece 23 Connecting cross beam 24 Pressing bolt 25 Connecting spring 26 Sleeve 300 Hull 200a Tail shaft hole 21a First switch 22a Second switch DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but are not intended to limit the scope of the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, constructed and operated in a particular orientation, and is only for the convenience of describing the technical solutions, and therefore cannot be understood as indicating that the device or element referred to must have a particular orientation, thus cannot be understood as limiting the present application.

[0029] Please refer to Figures 1 to 3 In the modern shipbuilding process, in order to improve the utilization rate of the shipbuilding dock and shorten the shipbuilding period, there is often a need for half-ship floating construction, that is, the ship engine room and part of the cargo hold area are first welded and constructed upward and backward in the tail area of the dock to form a stern half-ship. After the entire ship in the head area of the dock is welded and constructed and other processes are completed (when the ship can be docked), the stern half-ship is floated forward and the remaining bow section is constructed to form a whole ship. The tail area of the dock continues to construct a new stern half-ship to form a rolling construction mode, improving the efficiency of ship construction.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 Since the tail shaft of the stern half-ship has not been installed during the construction of the stern half-ship, the tail shaft hole 200a cannot be closed, and the tail shaft hole 200a is located in the waterline area. When floating, water will enter the engine room area through the tail shaft hole 200a, causing the engine room area to be contaminated by water or even unable to float. Therefore, the end face of the rear shaft hub needs to be temporarily sealed before the stern half-ship is floated to prevent water from entering the engine room area.

[0031] The prior art is a welding method, a certain number of 7-shaped clamps are mounted on the outer surface of the rear axle hub 200, the rear axle hub end face 201 is pressed by tightening the bolts on the 7-shaped clamps to form a pressure, so as to realize the water sealing requirement of the rear axle hub end face 201. However, the 7-shaped clamps mounted by welding have the following disadvantages: the 7-shaped clamps need to be welded and fixed on the surface of the rear axle hub 200, the rear axle hub 200 is generally a cast steel part, and the welding process of the cast steel part is complex and needs to be strictly preheated before welding and heat preserved after welding. Moreover, after the stern half ship is floated, the fixed 7-shaped clamps need to be removed, and the surface of the rear axle hub 200 in the welding area needs to be repaired and polished and non-destructive testing treatment, which has a long construction period, high construction cost, and poor weldability of the cast steel part, and has a high quality risk of crack defects in the process of welding, removing and repairing and polishing, so that the fixed 7-shaped clamps have a complex construction process, a long construction period and certain quality risks in the process of welding and removing.

[0032] Please refer to Figure 4 、 Figure 7 To solve the above problems, the present application provides a rear axle hub end face plugging device 100, the rear axle hub has oppositely arranged rear axle hub end face 201, connecting surface 203, and outer surface arranged between the rear axle hub end face 201 and the connecting surface 203, the rear axle hub is also provided with a stern shaft hole 200a penetrating the rear axle hub end face 201 and the connecting surface 203, the rear axle hub end face plugging device 100 is used to plug the stern shaft hole 200a on the rear axle hub end face 201, and the connecting surface 203 connects the ship body 300.

[0033] The rear axle hub end face plugging device 100 comprises a circular sealing plate 10 and a fixing assembly 20, the circular sealing plate 10 has a first surface and a second surface oppositely arranged along a first direction, the second surface is used to plug the stern shaft hole 200a on the rear axle hub end face 201, a plurality of fixing assemblies 20 are arranged along the circumference of the circular sealing plate, the fixing assembly 20 comprises a first magnetic attraction piece 21, a second magnetic attraction piece 22 and a connecting beam 23, the first magnetic attraction piece 21 and the second magnetic attraction piece 22 are arranged on the same side of the connecting beam 23, the first magnetic attraction piece 21 is used to attract the outer surface 202 of the rear axle hub, and the second magnetic attraction piece 22 is used to attract the first surface of the circular sealing plate 10.

[0034] In an embodiment, each fixing assembly 20 is evenly spaced along the circumference of the circular sealing plate 10. In this way, the application fixes the optimized rear hub sealing plate by a set of symmetrically distributed fixing assemblies 20 on the surface of the rear hub, and the fixing assemblies 20 use strong magnet devices to achieve accurate temporary fixing of the optimized rear hub sealing plate and ensure that it reaches the water-tight state. Further, the technical solution of the application realizes the welding-free temporary plugging and fixing of the rear hub end surface 201 by using magnetic attraction components, simplifies the construction process, improves the construction efficiency of the rear hub end surface 201 plugging and removal, prevents cracks and scar defects of the rear hub cast steel part during construction, effectively reduces the construction quality risk and comprehensive construction cost. At the same time, compared with welding, the rear hub end surface plugging device 100 will not be damaged during use by using magnetic attraction, has high reusability, and effectively reduces the cost.

[0035] Please refer to Figure 7 , the fixing assembly 20 further comprises a first limiting piece 11 and a pressing bolt 24, the connecting beam 23 is provided with a mounting hole, the first limiting piece 11 is located between the first magnetic attraction component 21 and the second magnetic attraction component 22, the mounting hole is located between the first limiting piece 11 and the first magnetic attraction component 21, and when the fixing assembly 20 is installed, the first limiting piece 11 and the first face are in contact, the pressing bolt 24 passes through the mounting hole and contacts the first face, and pushes the circular sealing plate 10 to move away from the connecting beam 23 in the direction away from the connecting beam 23, so that the circular sealing plate 10 moves away from the first limiting piece 11.

[0036] In an embodiment, the first limiting piece 11 is eight limiting round steels symmetrically distributed in pairs, the diameter of the limiting round steel is 10-20mm, the height is 10-15mm, and the limiting round steel is installed and welded on the first face of the circular sealing plate 10. In order to facilitate observation, it is arranged to be 5-10mm away from the edge of the circular sealing plate 10. In an embodiment, the first limiting piece 11 is arranged on the circular sealing plate 10, and in another embodiment, the first limiting piece 11 is arranged on the connecting beam 23. Only the function of abutting the first limiting piece 11 with the connecting beam 23 to ensure the spacing between the circular sealing plate 10 and the fixing assembly 20 is needed.

[0037] Please refer to Figure 7In an embodiment, the fixing assembly 20 further comprises a connecting spring 25, two ends of the connecting spring 25 are connected to the second magnetic member 22 and the connecting beam 23 respectively, the connecting spring 25 has an initial position and an elongated position, when the connecting spring 25 is in the initial position, the sum of the length of the connecting spring 25 and the second magnetic member 22 is less than the length of the first limiting member 11, so that when the fixing assembly 20 is installed, the connecting spring 25 is in the elongated position. Here, the length of the connecting spring 25 and the second magnetic member 22, that is, the distance along the first direction in which they extend.

[0038] Optionally, the tail end of the connecting spring 25 is vertically installed on the connecting beam 23, and the head end of the connecting spring 25 is vertically installed on the second magnetic member 22. This is because during the tightening process of the compression bolt 24, the compression bolt 24 will exert a forward force on the connecting spring 25, which will cause the connecting beam 23 to easily tilt upward, and the second magnetic member 22 will have a tendency to move away from the rear hub end surface 201. At this time, the connecting spring 25 is deformed and elongated under the force, thereby generating a restoring force to overcome the force exerted by the compression bolt 24, thereby preventing the second magnetic member 22 from being pushed away from the rear hub end surface 201, which will affect the installation of the rear hub end surface sealing device 100.

[0039] Please refer to Figure 7 In an embodiment, the fixing assembly 20 further comprises a sleeve 26, the sleeve 26 is sleeved outside the connecting spring 25, one end of the sleeve 26 is fixed to the connecting beam 23, and the length of the sleeve 26 is not greater than the length of the connecting spring 25 in the initial position.

[0040] The outside of the connecting spring 25 has a sleeve 26, the rear end of the sleeve 26 is welded and fixed to the front surface of the connecting beam 23, and the front end is in contact with the second magnetic member 22 but is not fixed, which is used to support the weight of the second magnetic member 22, so as to prevent excessive lateral deformation of the second magnetic member 22 due to the gravity of the second magnetic member 22 when the fixing assembly 20 is placed in a certain position during transportation and storage, which will affect the service life of the fixing assembly 20.

[0041] Please refer to Figure 7 In an embodiment, the end of the compression bolt 24 in contact with the first surface of the circular sealing plate 10 is provided in a hemispherical shape. Specifically, the compression bolt 24 passes through the mounting hole on the connecting beam 23, and the front and rear positions of the end of the compression bolt 24 can be moved by rotating the compression bolt 24. The end of the compression bolt 24 is provided in a hemispherical shape, which can reduce the friction between the end of the bolt and the circular sealing plate 10 during compression, and can effectively prevent the displacement of the circular sealing plate 10 caused by the compression bolt 24 during the process.

[0042] Please refer to Figure 5 ,Figure 6 In an embodiment, the first surface of the circular sealing plate 10 is further provided with an annular reinforcing plate 12, the height of the annular reinforcing plate 12 is less than the height of the first limiting member 11, and the annular reinforcing plate 12 is located between the first magnetic member 21 and the compression bolt 24 when the fixing assembly 20 is installed.

[0043] If the annular reinforcing plate 12 is not provided, the edge of the circular end plate is prone to wave deformation, and there is a risk of poor local sealing. In the prior art, in order to prevent wave deformation, the thickness of the existing circular surrounding plate is set to be between 15 to 20 mm, and the weight is relatively large, which causes problems such as waste of materials, difficulty in carrying, etc. In the embodiment proposed in the present application, due to the provision of the annular reinforcing plate 12, wave deformation is effectively prevented. The thickness of the circular sealing plate 10 can be set to be 6 to 12 mm, which effectively reduces the weight of the circular sealing plate 10. Further, in order to better achieve the sealing effect, the radius of the circular sealing plate 10 should be 5 to 10 mm smaller than the radius of the outer peripheral edge of the rear axle hub end surface 201, so that the circular sealing plate 10 can seal the tail shaft hole 200a, and the outer periphery does not exceed the outer peripheral edge of the rear axle hub end surface 201. In another embodiment, the height of the annular reinforcing plate 12 is 30 to 50 mm, and the distance from the outer peripheral edge of the circular sealing plate 10 is 5 to 10 mm.

[0044] In an embodiment, the annular reinforcing plate 12 is discontinuously welded to the circular sealing plate 10 in a staggered and symmetrical manner.

[0045] The annular reinforcing plate 12 and the circular sealing plate 10 are welded by CO2 gas shielded welding, the height of the welding leg needs to be less than 5 mm, the two sides of the annular reinforcing plate are welded in a staggered and symmetrical discontinuous welding method, a 30 mm long weld is first welded, then 50 mm is left without welding, and then a 30 mm long weld is symmetrically welded on the other side, and so on, so that a complete circle of welds is welded, and the butt weld between the annular reinforcing plates needs to be completely welded. The welding method can effectively reduce the welding deformation and further reduce the probability of wave deformation of the outer periphery of the circular sealing plate 10.

[0046] Please refer to Figure 5 、 Figure 6 In an embodiment, the second surface of the circular sealing plate 10 is provided with an annular sealing strip 14, and the annular sealing strip 14 is compressed and deformed by the rear axle hub end surface 201 during the installation of the rear axle hub end surface sealing device 100, thereby sealing the tail shaft hole 200a.

[0047] Further, the annular sealing strip 14 is a rubber strip. When the rear hub blocking device 100 is installed, the annular sealing strip 14 and the rear hub end face 201 are just in contact. Then the installation of the fixing assembly 20 is carried out. The annular sealing strip 14 not only has the function of improving the sealing performance, but also can better determine the installation position of the circular sealing plate 10.

[0048] Please refer to Figure 6 In an embodiment, the second face of the circular sealing plate 10 is further provided with a second limiting piece 15, which is arranged between the annular sealing strip 14 and the outer periphery of the circular sealing plate 10, and the height of the second limiting piece 15 is less than that of the annular sealing strip 14. During the installation of the rear hub end face blocking device 100, the annular sealing strip 14 is compressed by the rear hub end face 201 until the second limiting piece 15 and the rear hub end face 201 are in abutment.

[0049] If the circular sealing plate 10 does not have the second limiting piece 15, the compression amount of the annular sealing strip 14, i.e. the amount of deformation of the sealing rubber strip due to compression, is uncontrollable. If the compression amount is small, leakage may occur, and if the compression amount is too large, the sealing rubber strip will lose elasticity too early, reducing its effective service life.

[0050] In an embodiment, the distance between the annular reinforcing plate 12 and the outer periphery of the circular sealing plate 10 is a, the distance between the second limiting piece 15 and the outer periphery of the circular sealing plate 10 is b, and the distance between the mounting hole and the first magnetic member 21 is c, wherein 5mm≤a≤10mm, 5mm≤b≤10mm, and c≥30mm.

[0051] Specifically, the first limiting piece 11 is vertically installed and welded on the side of the connecting beam 23 facing the circular sealing plate 10, and is located between the compression bolt 24 and the connecting spring 25. The length of the first limiting piece 11 needs to be greater than the height of the annular reinforcing plate, so as to avoid interference of the annular sealing plate with the installation of the fixing assembly 20. At the same time, the distances a, b and c are controlled, so as to ensure that the annular reinforcing plate 12 of the circular sealing plate 10 is located between the inner surface of the first magnetic member 21 and the compression bolt 24.

[0052] Please refer to Figure 5 In an embodiment, the first face is further provided with a lifting ring 13. Since the volume and weight of the circular sealing plate 10 are large, the lifting ring 13 is provided to connect the crane, so as to facilitate the installation and removal of the circular sealing plate 10.

[0053] Please refer to Figure 7In an embodiment, the first magnetic attraction member 21 and the second magnetic attraction member 22 are provided with switches for controlling the attraction force of the first magnetic attraction member 21 and the second magnetic attraction member 22. Specifically, the first magnetic attraction member 21 and the second magnetic attraction member 22 are respectively provided with a first switch 21a and a second switch 22a for switching the magnetic force. In this way, the positions of the first magnetic attraction member 21 and the second magnetic attraction member 22 can be adjusted to the preset positions first, and then the switches are turned on to perform the attraction, thereby facilitating the installation of the rear axle hub end face sealing device 100.

[0054] Please refer to Figure 7 In an embodiment, the side of the first magnetic attraction member 21 facing the outer surface 202 of the rear axle hub is provided in a circular arc shape. Specifically, the arc shape of the first magnetic attraction member 21 substantially matches the arc shape of the outer surface of the rear axle hub, thereby increasing the contact area with the outer surface 202 of the rear axle hub and ensuring the maximization of the limited magnetic force.

[0055] The present application also provides a method for installing the rear axle hub end face sealing device 100, which applies the rear axle hub end face sealing device 100 described above, and includes the following steps:

[0056] S1, connecting the circular sealing plate 10 and the crane to hoist the circular sealing plate 10 to the first preset position so that the circular sealing plate 10 is arranged close to the rear axle hub end face 201. The crane is used to hoist the circular sealing plate 10 to the position with the lifting ring 13 as the fulcrum, and the circular sealing plate 10 is as close as possible to the rear axle hub end face 201. Specifically, the sealing rubber strip is attached to the rear axle hub end face 201, and the two are concentric as much as possible, that is, the distance between the outer periphery edges of the circular sealing plate 10 and the rear axle hub end face 201 is as uniform as possible.

[0057] S2, installing a plurality of first magnetic attraction members 21 so that each first magnetic attraction member 21 is attracted to the outer surface 202 of the rear axle hub. According to the position of the first limiting member 11, the installation position of each first magnetic attraction member 21 is determined. First, the switch of the first magnetic attraction member 21 is turned on to make the inner surface of the first magnetic attraction member 21 fully contact the outer surface 202 of the rear axle hub, and then the first magnetic attraction member 21 is slid in the bow direction. When the first limiting member 11 contacts the connecting crossbeam 23, the switch of the first magnetic attraction member 21 is turned off to make the first magnetic attraction member 21 firmly attracted to the outer surface of the rear axle hub. All the first magnetic attraction members 21 are installed in pairs of symmetry according to the above method.

[0058] S3, install a plurality of second magnetic members 22, so that each of the second magnetic members 22 is adsorbed on the first surface of the circular sealing plate 10. Specifically, turn on the switch of the second magnetic member 22, and push the second magnetic member 22 forward with the hand, so that it is firmly adsorbed on the first surface of the circular sealing plate 10. Fix all the second magnetic members 22 in the above-mentioned manner. After this step is completed, make the first limiting member 11 abut against the circular sealing plate 10, and then tighten all the compression bolts 24. Turn the compression bolts 24 with a wrench step by step, and under the action of the forward pressure of the bolts, the circular sealing plate 10 moves forward (i.e. moves towards the rear hub end surface 201) synchronously, at this time, the first end of the first limiting member 11 on the connecting beam 23 gradually comes out of contact with the rear hub end surface 201, the connecting spring 25 is gradually elongated, the first end of the sleeve 26 gradually comes out of contact with the surface of the second magnetic member 22, and the sealing rubber strip of the circular sealing plate 10 is gradually compressed and deformed, and the second limiting member 15 of the circular sealing plate 10 gradually approaches the rear hub end surface 201. When the second limiting member 15 of the rear circular sealing plate 10 comes into contact with the rear hub end surface 201, the compression action of the compression bolt 24 is stopped, and the compression construction action of one compression bolt 24 is completed. The compression construction action of all the compression bolts 24 is completed in pairs and symmetrically according to the above-mentioned method.

[0059] S4, disconnect the crane from the circular sealing plate 10, and complete the installation of the rear hub end surface sealing device 100. After all the compression bolts 24 are compressed, check whether all the second limiting members 15 on the circular sealing plate 10 are in full contact with the rear hub end surface 201, and then loosen the lifting ring 13, complete the sealing of the rear hub end surface, and meet the requirement of floating the ship stern half.

[0060] The application also provides a dismounting method of the rear hub end surface sealing device 100, which applies the rear hub end surface sealing device 100 described above, and comprises the following steps:

[0061] S01, connect the circular sealing plate 10 and the crane, so that the circular sealing plate 10 is tightly fixed. Specifically, after the ship stern half is floated into the water in the dry dock, the crane is used to tightly fix the circular sealing plate 10 by taking the lifting ring 13 as the fulcrum, so as to prevent it from falling during the dismounting process.

[0062] S02, dismount a plurality of second magnetic members 22. Turn on the switch of all the second magnetic members 22, so that they come out of contact with the rear hub end surface 201.

[0063] S03, dismount a plurality of first magnetic members 21. Turn on the switch of all the first magnetic members 21, so that the magnetic force between the first magnetic members 21 and the outer surface 202 of the rear hub disappears, and all the strong magnet devices are taken away and properly stored for repeated use.

[0064] S04, the circular sealing plate 10 is hoisted to the second preset position, so that the circular sealing plate 10 is separated from the rear shaft hub end face 201, and the disassembly of the rear shaft hub end face sealing device 100 is completed. Specifically, the circular sealing plate 10 is removed by using a crane, and the disassembly of the rear shaft hub end face sealing device 100 is completed. In the whole process, the rear shaft hub is not subjected to any welding and other heat work, and is completely kept in the original state, without leaving any scar and quality hidden danger.

[0065] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art of the present technology can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

[0066] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art of the present technology can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

[0067] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art of the present technology can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A rear axle hub face plugging device, characterized by, The application relates to a rear shaft hub end face sealing device. The device comprises a circular sealing plate with a first surface and a second surface oppositely arranged along a first direction, the second surface being used for sealing a stern shaft hole on the rear shaft hub end face; a plurality of fixing assemblies are arranged along the circumference of the circular sealing plate, each of the fixing assemblies comprising a first magnetic attraction element, a second magnetic attraction element and a connecting beam, the first magnetic attraction element and the second magnetic attraction element being arranged on the same side of the connecting beam; the first magnetic attraction element is used for attracting the outer surface of the rear shaft hub, and the second magnetic attraction element is attracted to the first surface of the circular sealing plate; the fixing assembly further comprises a first limiting element and a pressing bolt, the connecting beam is provided with a mounting hole, the first limiting element is arranged between the first magnetic attraction element and the second magnetic attraction element, the mounting hole is arranged between the first limiting element and the first magnetic attraction element, when the fixing assembly is installed, the first limiting element is in contact with the first surface, the pressing bolt passes through the mounting hole and is in contact with the first surface, and the pressing bolt pushes the circular sealing plate to move away from the connecting beam, so that the circular sealing plate moves away from the first limiting element; the fixing assembly further comprises a connecting spring, two ends of the connecting spring are connected to the second magnetic attraction element and the connecting beam respectively, the connecting spring has an initial position and an elongated position, when the connecting spring is in the initial position, the sum of the distances in the first direction, at which the connecting spring and the second magnetic attraction element extend, is smaller than the distance in the first direction, at which the first limiting element extends, so that when the first limiting element and the circular sealing plate are in contact, the connecting spring is in the elongated position; the fixing assembly further comprises a sleeve, the sleeve is arranged outside the connecting spring, one end of the sleeve is fixed to the connecting beam, and the length of the sleeve is not greater than the length of the connecting spring in the initial position; one end of the pressing bolt close to the circular sealing plate is arranged in a hemispherical shape; the first surface of the circular sealing plate is further provided with an annular reinforcing plate, the annular reinforcing plate extends in the first direction by a distance smaller than the distance in the first direction, at which the first limiting element extends, and when the fixing assembly is installed, the annular reinforcing plate is arranged between the first magnetic attraction element and the pressing bolt; the second surface of the circular sealing plate is provided with an annular sealing strip, during the installation of the rear shaft hub end face sealing device, the annular sealing strip is deformed by being pressed by the rear shaft hub end face, so as to seal the stern shaft hole; the second surface of the circular sealing plate is further provided with a second limiting element, the second limiting element is arranged between the annular sealing strip and the outer circumference of the circular sealing plate, the height of the second limiting element is smaller than the height of the annular sealing strip, and during the installation of the rear shaft hub end face sealing device, the annular sealing strip is pressed by the rear shaft hub end face until the second limiting element and the rear shaft hub end face abut; the distance between the annular reinforcing plate and the outer circumference of the circular sealing plate is a, the distance between the second limiting element and the outer circumference of the circular sealing plate is b, and the distance between the mounting hole and the first magnetic attraction element is c, wherein 5mm<=a<=10mm, 5mm<=b<=10mm, and c>=30mm. ​ ​ ​ ​ 2. The rear axle hub end face plugging device of claim 1, wherein, ​ 3. The rear axle hub end face plugging device of claim 1, wherein, ​ 4. The rear axle hub end face plugging device of claim 1, wherein, ​ 5. The rear axle hub end face plugging apparatus of claim 4, wherein, ​ 6. The rear axle hub end face plugging apparatus of claim 5, wherein, ​ 7. The rear axle hub end face plugging apparatus of claim 6, wherein, ​ 8. The rear axle hub end face plugging apparatus of claim 4 wherein, The annular reinforcing plate is discontinuously welded to the circular sealing plate in staggered symmetry.

9. The rear axle hub end face plugging apparatus of claim 1 wherein, The first surface is further provided with a lifting ring.

10. The rear axle hub end face plugging apparatus of claim 1 wherein, The first magnetic attraction member and the second magnetic attraction member are both provided with a switch for controlling the attraction force of the first magnetic attraction member and the second magnetic attraction member.

11. The rear axle hub end face plugging apparatus of claim 1 wherein, The side of the first magnetic attraction member facing the outer surface of the rear axle hub is provided in a circular arc shape.

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