Long shaft supporting frame and application method

Abstract

The invention relates to the technical field of ship long shaft maintenance, and particularly discloses a long shaft supporting frame and an application method. Comprising a support body, and the support body is arranged on a main control table and comprises an outer cylinder and two long-shaft fixed rotating bodies; the outer cylinder is of a straight-through cylinder structure, and an operation opening is formed in the side wall of the middle of the outer cylinder. The long shaft fixing rotating body is movably arranged in the outer cylinder; the long shaft fixing rotating body is provided with a long shaft fixing hole in the axial direction, and a target long shaft is detachably fixed in the long shaft fixing hole. According to the application method of the long shaft supporting frame, the long shaft supporting frame is used for conducting welding repair on a fractured long shaft, by means of the long shaft supporting frame, the welding quality can be remarkably improved, and the situation of secondary cracking after repair is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ship long shaft maintenance, and in particular to a long shaft support frame and an application method thereof. Background Art

[0002] In ship repair projects, we often encounter long shaft fractures such as ship rudders and seawater pump shafts. When welding is required, shielding gas is currently used for welding. However, for example, if the rudder is a forged steel part and the seawater pump shaft is made of stainless steel, the problems of using flux-cored wire for surface welding of the cross-section are as follows: (1) The molecular bonding force between the welding material and the shaft body material at the welding point is limited. During long-term use, the weld surface may crack again due to excessive torque, immersion and other use environments. (2) Traditional welding is mostly surface welding. A single layer of surface weld surface is difficult to withstand high torque and other use environments. (3) The welding point is at high temperature during the welding process. Due to uneven temperature, stress on the shaft body cannot be effectively released, affecting the welding quality. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a long shaft support frame and an application method to improve the maintenance effect of the long shaft of a ship.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A long-axis support frame comprises a support body, which is arranged on a main control console, and the support body comprises an outer cylinder and two long-axis fixed swivels; the outer cylinder is a straight-through cylindrical structure, and an operation port is arranged on the side wall of the middle; the long-axis fixed swivel is movably arranged in the outer cylinder; the long-axis fixed swivel is axially provided with a long-axis fixed hole, and the target long axis can be detachably fixed in the long-axis fixed hole.

[0006] Optionally, the main body of the long-axis fixing swivel is a cylindrical structure, and a plurality of screw holes are radially arranged on its side wall; tightening bolts are arranged in the screw holes for radially pressing the target long axis.

[0007] Optionally, a viewing window is provided in the middle of the outer cylinder, and the operating port is provided at the viewing window.

[0008] Optionally, a heating device is provided on the side wall of the middle part of the inner cavity of the outer tube, and an air inlet and an air outlet are also provided on the side wall of the outer tube.

[0009] Optionally, the heating device is an induction heater or an electric heater.

[0010] Optionally, a driving assembly is further included, which can be movably arranged at the outer end of the long-axis fixed swivel and is used to axially squeeze the long-axis fixed swivel and / or provide a rotational driving force to the long-axis fixed swivel.

[0011] Optionally, the driving assembly includes a movable platform, which is movably arranged on the main control console; a rotating head support seat and a rotating head assembly are arranged on the movable platform; the rotating head assembly is rotatably arranged on the rotating head support seat; the rotating head assembly includes a rotating head body, and a telescopic head is telescopically arranged on the front part of the rotating head body; a clamping assembly fixed to the swivel with the long axis is arranged at the front end of the telescopic head; the telescopic head is driven to telescope by a hydraulic cylinder or a linear motor assembly; the hydraulic cylinder or the linear motor assembly is arranged on the rotating head body, and power supply is realized through a slewing mechanism or a commutator respectively; the rotating head assembly provides rotational force through a reduction motor.

[0012] An application method of a long axis support frame includes using the long axis support frame as described above to perform welding repair on a broken long axis, and the steps are as follows:

[0013] S1: clamping and fastening two sections of long shafts to be welded by using a clamping workpiece, applying extrusion force to the outer ends of the two sections of long shafts, and drilling along the cross section to form a first C-shaped groove and a second C-shaped groove on the cross section of the two sections of long shafts respectively;

[0014] S2: embedding a metal rod in the first C-shaped groove, wherein the diameter of the metal rod is greater than the depth of the first C-shaped groove and is not greater than the aperture formed by the first C-shaped groove and the second C-shaped groove;

[0015] S3: welding the metal rod in the first C-shaped groove to weld the metal rod to the first C-shaped groove;

[0016] S4: using the two long axis fixing swivels of the long axis support frame to fix the two long axis sections respectively, after assembly, pressing the two long axis fixing swivels against each other to squeeze the cross sections of the two long axis sections tightly, and then starting the heating device to heat the cross section area;

[0017] S5: inserting welding material through the operation port to perform welding operation on the long axis fracture, and at the same time, rotating the long axis fixed swivel to facilitate welding of the entire fracture.

[0018] Optionally, in S3, the metal rod and the first C-shaped groove are welded together by resistance welding. Optionally, before S4, the following steps are also included: two long axes are grooved on their surfaces along their fracture marks to form welding grooves, and the end of the metal rod is not lower than the bottom of the welding groove; when performing S5, welding is performed along the welding groove, and solder is filled in the welding groove.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The long axis support frame of the present invention can achieve effective fixation of the long axis to be repaired. The long axis to be repaired is squeezed and fixed by multiple tightening bolts through the long axis fixing swivel, and the first C-shaped groove and the second C-shaped groove are set, which can significantly improve the coaxiality after welding and the torsional bearing capacity of the long axis in the later stage, and significantly improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 is a cross-sectional view of the long axis support frame of the present invention;

[0023] Figure 2 is a cross-sectional view of a drive assembly of the present invention;

[0024] Figure 3 is a repair flow chart of a long axis to be repaired in a specific embodiment;

[0025] Figure 4 It is a schematic diagram of the cross section of the long axis to be repaired after drilling in a specific embodiment. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] A long axis support frame, such as Figures 1-2 As shown, it includes a bracket body, which is arranged on the main console through supporting legs, and the bracket body includes an outer cylinder 1 and two long-axis fixed swivels 24; the outer cylinder 1 is a straight-through cylindrical structure, and an operation port 3 is arranged on the side wall of the middle thereof; the outer cylinder 1 is fixed on the main console through supporting legs 18 and a tightening hole 19 at the bottom;

[0030] The long axis fixing swivel 24 is movably disposed in the outer tube 1; the long axis fixing swivel 24 is provided with a long axis fixing hole 17 along the axial direction, and the target long axis 10 can be detachably fixed in the long axis fixing hole 17. Figure 1 As shown, the outer end of the long axis fixing hole 17 is closed. The purpose of this design is to enable the long axis fixing swivel 24 to apply axial pressure to the target long axis 10 during later use, and to withstand rotational power for rotation.

[0031] Optionally, the main body of the long axis fixed swivel 24 is a cylindrical structure, and a plurality of screw holes are radially arranged on its side wall; the screw holes are provided with tightening bolts 5 for radially pressing the target long axis. In this embodiment, a notch is provided at the top of the screw hole to cause the top of the tightening bolt 5 to be lower than the outer surface of the long axis fixed swivel 24, so as to ensure that the long axis fixed swivel 24 can move in the outer cylinder 1. Optionally, a window 2 is provided in the middle of the outer cylinder 1, and the operation port 3 is provided at the window 2, so that the technician can observe the internal environment through the window 2, which is convenient for welding operation. In this embodiment, the middle of the outer cylinder 1, that is, directly below the window 2, is the operation area. When assembling, the position of the long axis fixed swivel 24 needs to be adjusted according to the length of the two sections of the target long axis 10, so that the cross-sectional area of ​​the target long axis 10 is within the operation area.

[0032] Optionally, a heating device 12 is provided on the side wall of the inner cavity of the outer tube 1, and an air inlet 13-1 and an exhaust port 13 are also provided on the side wall of the outer tube 1. In this embodiment, the air inlet 13-1 is used for air intake, for example, when performing shielded gas welding, an external shielding gas, such as carbon dioxide, is connected; and the exhaust port 13 is arranged at the lower part, and is externally connected to a negative pressure exhaust pipe. The advantage of this design is that the welding gas can be drawn downward to reduce the smoke in the operation area from blocking the line of sight.

[0033] Optionally, the heating device is an induction heater or an electric heater, the purpose of which is to preheat the welding shaft to a certain temperature based on the requirements of the welding process.

[0034] Optionally, it also includes a drive component, such as Figure 2As shown, the driving assembly can be movably disposed at the outer end of the long-axis fixed swivel 24, and is used to axially press the long-axis fixed swivel 24 and / or provide a rotational driving force to the long-axis fixed swivel.

[0035] Optionally, the driving assembly includes a moving platform 26, and the moving platform 26 is movably arranged on the main console; in the present embodiment, slide grooves 20 are respectively arranged on both sides of the main console, and screw holes 22 are arranged on the side surfaces 21 of the slide grooves 20, and the side surfaces 27 of the moving platform 26 are pressed by bolts on the side surfaces; a rotating head support seat 31 and a rotating head assembly 30 are arranged on the moving platform 26; the rotating head assembly 30 is rotatably arranged on the rotating head support seat 31 through a bearing 33; the rotating head assembly 30 includes a rotating head body, and a telescopic head 8 is telescopically arranged at the front part of the rotating head body, and in the present embodiment, the telescopic head 8 is arranged in a polygonal shape to prevent it from rotating with the rotating head assembly 30. The front end of the telescopic head 8 is provided with a clamping assembly with the long-axis fixed swivel 24, such as Figure 1 The outer end of the long axis fixed swivel 24 is provided with a bayonet 9, and Figure 2 In the embodiment, the telescopic head 8 is provided with a right turntable 7 (such as Figure 1 The driving assembly on the left side shown in the figure is also provided with a left turntable 23), and a clamping head 6 is provided on the right turntable 7 corresponding to the clamping mouth 9; the telescopic head 8 is driven to telescope by a hydraulic cylinder 28 or a linear motor assembly; the hydraulic cylinder 28 or the linear motor assembly is arranged on the inner cavity 29 of the rotating head body, and the power supply is realized through a rotating mechanism 32 or a commutator respectively; the rotating head assembly provides rotational force through a reduction motor (composed of a motor 25 and a reducer 35, and fixed on a moving platform 26).

[0036] An application method of a long axis support frame includes using the long axis support frame as described above to perform welding repair on a broken long axis, and the steps are as follows:

[0037] S1: Use a clamping workpiece to clamp and tighten the two sections of the left long axis 16 and the target long axis 10 to be welded, apply extrusion pressure to the outer ends of the two long axis sections, drill holes along the cross section (radial drilling can be performed from the fracture mark along the cross section as needed), so as to form a first C-shaped groove and a second C-shaped groove on the cross section 10-1 of the two long axis sections respectively; the purpose of this step is: (1) the setting of the first C-shaped groove and the second C-shaped groove can provide decomposition for the stress generated by the high temperature in the later heating and welding process. The idea of ​​this setting is: when using the long axis support frame for welding operation, such as Figure 1As shown, a plurality of tightening bolts 5 are used to compress the non-welding areas of the left section long axis 16 and the target long axis 10, and the tightening operation can be carried out according to the following steps, i.e., the outer cylinder 1 is removed, and then the right turntable 7 and the left turntable 23 on both sides are used to axially extrude the two long axis fixed swivels 24 to make their cross sections close (coaxial), and then the plurality of tightening bolts 5 are tightened symmetrically up and down and left and right, and the minimum tightening force of the tightening bolts 5 is selected according to the thermal expansion coefficient of the shaft material to prevent the left section long axis 16 and the target long axis 10 from being out of axial alignment due to stress during heating and welding; that is, the non-welding areas of the left section long axis 16 and the target long axis 10 are compressed to make the relevant stress absorbed by the first C-shaped groove and the second C-shaped groove to ensure coaxiality after welding. (2) A metal rod 36 can be embedded in the subsequent step. That is, after welding, the long shaft usually provides rotation torque, and the embedded metal rod 36 can improve the torque tolerance of the section during the rotation of the long shaft. Compared with the traditional welding on the surface of the section, it can improve the torque tolerance of the long shaft and reduce the problem of secondary cracking due to large torque in the section. (3) The first C-shaped groove and the second C-shaped groove are set along the section, so that the drilling holes are generally not all on the same cross-section (because the fracture surface is often irregular, such as Figure 3 The fracture mark 11 is a curve, such as Figure 4 The first C-shaped groove 14 and the section 10-2 are drilled on the section 10-1 in the cross section shown, so that all the drill holes are not concentrated on the same plane, that is, they are arranged three-dimensionally between the leftmost side and the rearmost side of the fracture mark, which can reduce the impact of the opening on the rigidity of the shaft body. At the same time, it can effectively release the stress of the welding area more effectively in three dimensions / three-dimensionally decompose the stress, improve the coaxiality after welding, and the stability and torque tolerance of subsequent use.

[0038] S2: embedding a metal rod 36 in the first C-shaped groove 14, wherein the diameter of the metal rod 36 is greater than the depth of the first C-shaped groove 14 and is not greater than the aperture formed by the first C-shaped groove and the second C-shaped groove;

[0039] S3: welding the metal rod in the first C-shaped groove to the first C-shaped groove, and a resistance welding process may be used to minimize the impact of welding on the fit of the cross section.

[0040] S4: using the two long axis fixing swivels of the long axis support frame to fix the two long axis sections respectively, after assembly, pressing the two long axis fixing swivels against each other to squeeze the cross sections of the two long axis sections tightly, and then starting the heating device to heat the cross section area;

[0041] S5: inserting welding material through the operation port to perform welding operation on the long axis fracture, and at the same time, rotating the long axis fixed swivel to facilitate welding of the entire fracture.

[0042] Optionally, before S4, the following steps are also included: Figure 4 As shown, two long shafts are grooved on their surfaces along their fracture marks to form welding grooves 37, and the end of the metal rod 36 is not lower than the bottom of the welding groove; when performing S5, welding is performed along the welding groove, as shown in FIG. Figure 3 As shown, the solder 37-1 is filled in the welding groove to make the solder 37-1 contact with the outer end of the metal rod 36, that is, the left section long axis 16, the target long axis 10 and the metal rod 36 are welded together by the solder 37-1 to improve the rigidity of the connection.

Claims

1. A long axis support frame, characterized in that: It includes a bracket body, which is arranged on a main control console. The bracket body includes an outer cylinder and two long-axis fixed swivels; the outer cylinder is a straight-through cylindrical structure, and an operation port is arranged on the side wall of the middle; the long-axis fixed swivel is movably arranged in the outer cylinder; the long-axis fixed swivel is axially provided with a long-axis fixed hole, and the target long axis can be detachably fixed in the long-axis fixed hole.

2. A long axis support frame according to claim 1, characterized in that: The main body of the long-axis fixing swivel is a cylindrical structure, and a plurality of screw holes are radially arranged on the side wall thereof; tightening bolts are arranged in the screw holes for radially pressing the target long axis.

3. The long axis support frame according to claim 1, characterized in that: A viewing window is arranged in the middle of the outer cylinder, and the operating port is arranged at the viewing window.

4. The long axis support frame according to claim 1, characterized in that: A heating device is arranged on the side wall of the middle part of the inner cavity of the outer tube, and an air inlet and an air outlet are also arranged on the side wall of the outer tube.

5. The long axis support frame according to claim 4, characterized in that: The heating device is an induction heater or an electric heater.

6. The long axis support frame according to claim 1, characterized in that: It also includes a driving assembly, which can be movably arranged at the outer end of the long-axis fixed swivel and is used for axially squeezing the long-axis fixed swivel and / or providing a rotational driving force to the long-axis fixed swivel.

7. The long axis support frame according to claim 6, characterized in that: The driving assembly includes a moving platform, which is movably arranged on the main control console; a rotating head support seat and a rotating head assembly are arranged on the moving platform; the rotating head assembly is rotatably arranged on the rotating head support seat; the rotating head assembly includes a rotating head body, and a telescopic head is telescopically arranged on the front part of the rotating head body; a clamping assembly fixed to the long axis swivel is arranged at the front end of the telescopic head; the telescopic head is driven to telescope by a hydraulic cylinder or a linear motor assembly; the hydraulic cylinder or the linear motor assembly is arranged on the rotating head body, and power supply is realized through a slewing mechanism or a commutator respectively; the rotating head assembly provides rotational force through a reduction motor.

8. An application method of a long axis support frame, characterized in that: The method comprises using a long axis support frame as claimed in any one of claims 1 to 7 to perform welding repair on a broken long axis, the steps of which are as follows: S1: clamping and fastening two sections of long shafts to be welded by using a clamping workpiece, applying extrusion force to the outer ends of the two sections of long shafts, and drilling along the cross section to form a first C-shaped groove and a second C-shaped groove on the cross section of the two sections of long shafts respectively; S2: embedding a metal rod in the first C-shaped groove, wherein the diameter of the metal rod is greater than the depth of the first C-shaped groove and is not greater than the aperture formed by the first C-shaped groove and the second C-shaped groove; S3: welding the metal rod in the first C-shaped groove to weld the metal rod to the first C-shaped groove; S4: using the two long axis fixing swivels of the long axis support frame to fix the two long axis sections respectively, after assembly, pressing the two long axis fixing swivels against each other to squeeze the cross sections of the two long axis sections tightly, and then starting the heating device to heat the cross section area; S5: inserting welding material through the operation port to perform welding operation on the long axis fracture, and at the same time, rotating the long axis fixed swivel to facilitate welding of the entire fracture.

9. The application method of the long axis support frame according to claim 8, characterized in that: In S3, the metal rod and the first C-shaped groove are welded together by resistance welding.

10. The application method of the long axis support frame according to claim 8, characterized in that: Before S4, the following steps are also included: grooves are dug on the surface of the two long axes along their fracture marks to form welding grooves, and the end of the metal rod is not lower than the bottom of the welding groove; when performing S5, welding is performed along the welding groove to fill the solder in the welding groove.

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