Ship shaft lever welding repair auxiliary device

Abstract

The utility model relates to the technical field of ship shaft rod welding repair, in particular to a ship shaft rod welding repair auxiliary device which comprises a welding shaft cover, the welding shaft cover is of a straight-through sleeve structure and is provided with a welding area protection inner cavity, and the welding shaft cover is movably connected with a shaft rod to be welded. The welding shaft cover is provided with an air inlet chamber and an air exhaust chamber, and the air inlet chamber is provided with an air inlet and an air spraying hole; the air injection hole is formed in the inner wall of the welding area protection inner cavity; the air exhaust chamber is provided with an air exhaust hole and an air exhaust port; the air exhaust hole is communicated with the welding area protection inner cavity; a welding gun inserting opening is formed in the upper portion of the welding shaft cover, and a welding gun can freely move in the welding gun inserting opening. The welding device has the advantages of being good in welding process controllability, reliable in welding effect and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of ship shaft welding repair, in particular to an auxiliary device for ship shaft welding repair. Background Technique

[0002] In ship repair, it is common for the rudder stock, seawater pump shaft, etc. to be severely worn and need dimensional repair. Bearing parts, etc. are manufactured by professional manufacturers, and replacing them will extend the ship repair cycle. When using welding repair, for example: the rudder stock is a forged steel part and has been heat-treated, and cracks and deformations are likely to occur during the welding process, and in severe cases, the rudder stock will be scrapped; the shaft of the seawater pump is made of stainless steel, and selecting the appropriate welding method, welding material, and welding process is the key to ensuring the welding quality of the shaft. Summary of the Invention

[0003] Aiming at the above deficiencies, the utility model provides an auxiliary device for ship shaft welding repair with good use effect.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An auxiliary device for ship shaft welding repair includes a welding shaft cover. The welding shaft cover has a straight-through sleeve structure and is provided with a welding area protection inner cavity. The welding shaft cover is movably connected to the shaft to be welded; the welding shaft cover is provided with an air inlet chamber and an air extraction chamber. The air inlet chamber is provided with an air inlet and an air injection hole; the air injection hole is arranged on the inner wall of the welding area protection inner cavity; the air extraction chamber is provided with an air extraction hole and an exhaust port; the air extraction hole is communicated with the welding area protection inner cavity; a welding gun socket is arranged on the upper part of the welding shaft cover, and the welding gun can move freely in the welding gun socket.

[0006] Optionally, the welding shaft cover includes an upper cover and a lower cover, and the upper cover and the lower cover are detachably connected. Optionally, the air inlet chamber is arranged on the left side of the welding shaft cover, and the air extraction chamber is arranged on the right side of the welding shaft cover; first sealing rings are respectively arranged at the contact areas between the left and right side walls of the air inlet chamber and the shaft to be welded; a second sealing ring is arranged at the contact area between the right side wall of the air extraction chamber and the shaft to be welded; a plurality of the air extraction holes are arranged on the left side wall of the air extraction chamber.

[0007] Optionally, cooling blocks are further arranged on both sides of the welding shaft cover; the cooling blocks are detachably connected to the welding shaft cover.

[0008] Optionally, the body of the cooling block includes an upper semi-circular cooling block and a lower semi-circular cooling block. The upper semi-circular cooling block and the lower semi-circular cooling block are each provided with an arc-shaped groove, and the bottom of the arc-shaped groove is a hollow net; a fiber layer and a sponge layer are sequentially arranged upward from the bottom of the arc-shaped groove; a limiting net rod is further arranged above the sponge layer.

[0009] Optionally, a plurality of evaporation holes penetrating up and down are provided in the sponge layer.

[0010] Optionally, a transparent viewing window is provided on the upper part of the main body of the cooling block.

[0011] Optionally, a gas temperature control device is further included, and the temperature of the gas introduced into the protection inner cavity of the welding area is adjusted through the gas temperature control device; a temperature sensor is provided in the protection inner cavity of the welding area.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] By adopting the present utility model, the temperature of the welding shaft can be controlled. By enclosing the welding area into a relatively closed space and adopting a flowing air flow mode to form a welding cavity with a relatively stable amount of protective gas, it is beneficial to realize welding conditions with controllable temperature and controllable content of protective gas, and significantly improve the welding quality. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments.

[0015] Figure 1 is a horizontal sectional view of the welding shaft cover of the present utility model;

[0016] Figure 2 is the front view of the welding shaft cover of the present utility model;

[0017] Figure 3 is a structural schematic diagram of the cooling block of the present utility model;

[0018] Figure 4 is a partial upper structural schematic diagram of the welding shaft cover of the present utility model;

[0019] Figure 5 is a combined structural schematic diagram of the present utility model. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] As shown in the figure.

[0024] As Figure 1 shown, a ship shaft welding repair auxiliary device includes a welding shaft cover 1. The welding shaft cover 1 has a straight-through sleeve structure and is provided with a welding area protection inner cavity 17. In this embodiment, the welding shaft cover 1 is divided into two halves, namely an upper cover and a lower cover, and the upper cover and the lower cover are detachably connected. Connecting ears 10 are respectively provided on both sides of the upper cover and the lower cover, and tightening holes 9 are provided on the connecting ears 10; as Figure 2 shown, during use, the detachable connection between the upper cover and the lower cover is realized through bolts 18. The welding shaft cover 1 is put on the shaft rod 13 to be welded. After tightening, the welding shaft cover 1 can rotate relative to the shaft rod 13 to be welded. During preparation, the welding shaft cover 1 is processed into several models corresponding to the model sizes of the shaft rods to be welded, so as to facilitate using corresponding welding shaft covers for different models. During use, during the welding process, the welding shaft cover 1 is rotated along the weld direction while welding operations are carried out.

[0025] An air inlet chamber 15 and an air extraction chamber 4 are respectively arranged on the left and right sides of the welding shaft cover 1. The air inlet chamber 15 is provided with an air inlet 11 and air jet holes. In this embodiment, a welding area protection inner cavity 17 is arranged between the air inlet chamber 15 and the air extraction chamber 4. A plurality of first air jet holes 17-1 are arranged on the inner side wall of the welding area protection inner cavity 17. The plurality of first air jet holes 17-1 communicate with an air vent cavity 16. The air vent cavity 16 communicates with the air inlet chamber 15 through an air vent. During use, it can be realized that the plurality of first air jet holes 17-1 eject air towards the center, significantly improving the efficiency and uniformity of temperature control of the shaft rod 13 to be welded. A plurality of first air jet holes 8 are arranged on the right side wall of the air inlet chamber 15. In this embodiment, the opening directions of the plurality of first air jet holes 8 are inclined along the center direction on the right side, so as to be able to blow along the center direction during use. The air extraction chamber 4 is provided with an air extraction hole 2 and an exhaust port 4-1; as Figure 2 and Figure 4 shown, a welding gun socket 19 is arranged on the upper part of the welding shaft cover 1, and the welding gun 20 can move freely within the welding gun socket 19. For the convenience of operation, in this embodiment, a transparent viewing window 21 is arranged on the upper part of the body of the cooling block 1. In this embodiment, in order to facilitate viewing the environment inside the welding area protection inner cavity 17, a light-emitting band 20 can also be arranged on the outer periphery of the transparent viewing window 21. In some embodiments, a fully transparent lens or a dark black semi-transparent lens can be used in the transparent viewing window 21.

[0026] First sealing rings are respectively arranged at the contact areas between the left and right side walls of the air inlet chamber 15 and the shaft rod 13 to be welded. A second sealing ring 5 is arranged at the contact area between the right side wall of the air extraction chamber 4 and the shaft rod 13 to be welded. An inner end of the left side wall of the air extraction chamber 4 is provided with a ring-shaped cavity, and this ring-shaped cavity constitutes the air extraction hole 2.

[0027] Optionally, cooling blocks 12 are further provided on both sides of the welding shaft cover 1; the cooling blocks 12 are detachably connected to the welding shaft cover 1. In this embodiment, the cooling blocks 12 are detachably connected to the welding shaft cover 1 by means of plug joints 24; during preparation, the body of the cooling block 12 corresponding to the upper cover and the lower cover is correspondingly arranged to include an upper semi-circular cooling block and a lower semi-circular cooling block. The upper semi-circular cooling block and the lower semi-circular cooling block are each provided with an arc-shaped groove 28, and the bottom of the arc-shaped groove 28 is a hollow mesh 25; the arc-shaped groove 28 is sequentially provided with a fiber layer 27 and a sponge layer 22 from bottom to top; during preparation, the hollow part of the hollow mesh 25 is filled with fiber material 26; a limiting mesh rod 23 is further provided above the sponge layer 22. The purpose of such a design is to limit and fix the sponge layer 22 to prevent it from falling during the rotation of the device. The sponge layer 22 is provided with a number of evaporation holes that penetrate up and down. During use, the cooling block 12 can be selected. When it is necessary to increase the auxiliary cooling speed, the cooling block 12 is plugged onto the upper cover and the lower cover, and then cooling water is poured into the arc-shaped groove 28. When the temperature of the shaft rod 13 to be welded rises during the welding process, the cooling water of the fiber material 26 in contact with the shaft rod 13 to be welded continuously transfers heat upward, and water vapor volatilizes from the evaporation holes of the sponge layer 22 to achieve cooling. Optionally, as Figure 5 shown, a gas temperature control device 34 is further included. The inner cavity of the gas temperature control device 34 is provided with heat exchange fins 33. A high-temperature resistant cotton 31 can also be provided on the outer periphery of the heat exchange fins 33 to improve the air flow heat exchange effect. The heat exchange fins 33 are arranged in a ring shape. The outer peripheral cavity area thereof is an air inlet cavity, and an air outlet cavity is arranged in the center thereof. By providing an air inlet pipe in the air inlet cavity and an air outlet pipe in the air outlet cavity, when the air flow flows, through the inwardly contracting flow from the outside to the inside, the heat exchange effect of the air flow is improved; in this embodiment, when performing refrigeration and cooling, the cooling module group used can be a semiconductor water cooling system 36, which is input into the circulation pipeline 33 on the heat exchange fins 33 through a soft water pipe 35 to achieve cooling of the air flow; then a heating wire device (not shown) is further provided on the heat exchange fins 33 for heating the gas; in this embodiment, the gas temperature control device 34 is provided with a temperature control circuit, and its shell is provided with operation keys and a temperature display screen for temperature adjustment control to perform constant temperature heating on the gas; in this embodiment, in order to facilitate the control of the temperature of the air flow, a temperature sensing module (not shown) can also be provided in the air outlet cavity of the device to achieve the regulation of the temperature of the heat exchange gas; the temperature of the gas introduced into the welding area protection inner cavity 17 is regulated through the gas temperature control device 34; the welding area protection inner cavity 17 can also be provided with a temperature sensor 7, as Figure 1As shown, in this embodiment, considering the rotation during the operation of the welding shaft cover 1, the temperature sensor 7 is supported by a support rod 6 with good flexibility, which can prompt the temperature sensor 7 to contact the shaft rod 13 to be welded, perform temperature control on the shaft rod 13 to be welded, and is beneficial to improving the welding effect. In this embodiment, the temperature sensor 7 is externally connected to a temperature display screen for displaying the current temperature of the shaft rod 13 to be welded.

[0028] As Figure 5 shown, when in use, after the welding shaft cover 1 covers the shaft rod 13 to be welded, the intake pipe of the gas temperature control device 34 is externally connected to an air pump or connected to a protective gas tank 38 (such as a carbon dioxide gas tank), and then the outlet pipe of the gas temperature control device 34 is connected to the air inlet 11 of the welding shaft cover 1 through a hose 37. First, according to needs, air is adjusted in temperature, generally preheated. The exhaust port 4-1 is externally connected to an air extraction pump 30. The air extraction pump 30 is preferably a frequency conversion adjustable air pump. When in use, the air extraction pump 30 is started, and then the gas enters the gas temperature control device 34 for heat exchange, and then enters the protective inner cavity 17 of the welding area to heat / cool the shaft rod 13 to be welded. The temperature is detected by the temperature sensor 7, and then through relevant operations, the temperature is controlled within the required range; in the case of using the protective gas tank 38 for welding, because the internal air pressure of the protective gas tank 38 is high, the effect achieved by using the air extraction pump 30 is: timely extracting the welding waste gas in the protective inner cavity 17 of the welding area, and filling the entire protective inner cavity 17 of the welding area with the protective gas is beneficial to improving the welding effect of the protective gas. When in use, the better effect achieved by adjusting the power of the air extraction pump 30 is: most of the air flow is extracted from the air extraction pump 30, and a small amount of protective gas flows out from the welding torch socket 19.

[0029] A method for welding and repairing a ship shaft rod uses an auxiliary device for welding and repairing a ship shaft rod as described above to weld and repair a forged steel shaft rod or a stainless steel shaft rod.

[0030] I. For a forged steel shaft rod, in this embodiment, for example, when welding and repairing a rudder stock, the rudder stock of the Coast Guard 4XX3 ship is made of 20MnA, forged steel for shafts, and normalized at 900°C. The maximum diameter of the rudder stock is φ170mm, and through on-site measurement, the diameter at the area with the largest wear is φ162mm.

[0031] The rudder stock is restored to its size by surfacing welding, and it is necessary to solve the problems of ensuring no cold cracks during the surfacing welding process, no excessive deformation, and ensuring that the mechanical properties of the surfacing weld are not lower than those of the original rudder stock.

[0032] Use this auxiliary device for welding and repairing a ship shaft rod for auxiliary operation:

[0033] It includes the following steps:

[0034] (1) Slip the welding shaft sleeve over the rudder stock and introduce high-temperature gas into the rudder stock to keep the temperature of the rudder stock at 100 - 120 °C;

[0035] (2) Use flux-cored wire CO2 welding as the welding method for continuous surfacing. At the same time, replace the high-temperature gas with welding shielding gas and control the temperature of the rudder stock to be maintained above 200 °C during the welding process;

[0036] (3) After welding, keep the temperature of the rudder stock not less than 500 °C and the time not less than 120 min. Compared with the traditional conventional flux-cored wire CO2 welding method (welding without this ship shaft welding repair auxiliary device, involving heat preservation using heat-insulating cotton, etc.), the technical effect parameters achieved by the technical solution of the present utility model are compared as follows:

[0037]

[0038]

[0039] Thanks to the welding assistance of this ship shaft welding repair auxiliary device, it realizes efficient, timely and accurate control of the temperature rise and fall during the welding process, improves the gas density of the shielding gas around the welded body during the welding process, improves the gas protection effect, significantly improves the welding quality and avoids crack generation.

[0040] Second, for welding repair of stainless steel shafts, such as surfacing of seawater pump shafts, flux-cored wire CO2 welding is selected as the welding method and the welding consumables are 316L; the following steps are included:

[0041] (1) Slip the welding shaft sleeve over the seawater pump shaft and perform intermittent surfacing welding on the seawater pump shaft to prevent the surfacing weld from overheating and keep the temperature of the seawater pump shaft below 150 °C;

[0042] (2) Divide the seawater pump shaft into 4 equal segments along the circumferential direction and perform symmetric welding;

[0043] (3) After welding, perform forced and rapid cooling by blowing in normal-temperature gas. If necessary, use cooling blocks to enhance the cooling of the non-welded area to accelerate the cooling of the seawater pump shaft and avoid overheating of the weld after welding until the temperature of the seawater pump shaft approaches normal temperature.

[0044] Compared, the technical effect parameters achieved by the technical solution of the present utility model are compared as follows:

[0045]

Claims

1. A ship shaft welding repair auxiliary device, characterized in that: It includes a welding shaft cover, which is a straight-through sleeve structure and is provided with a welding area protection inner cavity. The welding shaft cover is movably connected to the shaft rod to be welded; the welding shaft cover is provided with an air intake chamber and an air exhaust chamber, and the air intake chamber is provided with an air inlet and an air jet hole; the air jet hole is arranged on the inner wall of the welding area protection inner cavity; the air exhaust chamber is provided with an air exhaust hole and an air exhaust hole; the air exhaust hole is connected with the welding area protection inner cavity; a welding gun socket is provided on the upper part of the welding shaft cover, and the welding gun can move freely in the welding gun socket.

2. A ship shaft welding repair auxiliary device according to claim 1, characterized in that: The welding shaft cover comprises an upper cover and a lower cover, and the upper cover and the lower cover are detachably connected.

3. A ship shaft welding repair auxiliary device according to claim 1, characterized in that: The air inlet chamber is arranged on the left side of the welding shaft cover, and the air exhaust chamber is arranged on the right side of the welding shaft cover; the left and right side walls of the air inlet chamber and the contact area with the shaft rod to be welded are respectively provided with a first sealing ring; the right side wall of the air exhaust chamber and the contact area with the shaft rod to be welded are provided with a second sealing ring; the left side wall of the air exhaust chamber is provided with a plurality of air exhaust holes.

4. A ship shaft welding repair auxiliary device according to claim 1, characterized in that: A cooling block is also provided on both sides of the welding shaft cover; the cooling block is detachably connected to the welding shaft cover.

5. A ship shaft welding repair auxiliary device according to claim 4, characterized in that: The main body of the cooling block includes an upper arc cooling block and a lower arc cooling block. The upper arc cooling block and the lower arc cooling block are each provided with an arc groove, and the bottom of the arc groove is a hollow mesh; the arc groove is provided with a fiber layer and a sponge layer in sequence from the bottom to the top; a limiting net rod is also provided above the sponge layer.

6. A ship shaft welding repair auxiliary device according to claim 5, characterized in that: The sponge layer is provided with a plurality of evaporation holes which are vertically connected.

7. A ship shaft welding repair auxiliary device according to claim 4, characterized in that: A transparent window is arranged on the upper part of the body of the cooling block.

8. The ship shaft welding repair auxiliary device according to claim 1, characterized in that: It also includes a gas temperature control device, through which the temperature of the gas entering the welding area protection cavity is adjusted; the welding area protection cavity is provided with a temperature sensor.

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