CN113134669B - A heating device in a plasma welding box - Google Patents

Abstract

The invention discloses a heating device in a plasma welding box, which comprises a heating chamber outer shell, a plasma welding gun arranged at the upper end of the heating chamber outer shell, a heating platform positioned in the heating chamber outer shell and a heating pipe arranged on the heating platform; the heating pipe is externally connected with a heating control system, and a temperature monitoring module is further arranged on the heating pipe and is electrically connected with the heating control system, and the temperature monitoring module is used for transmitting a temperature signal of the heating pipe to the heating control system; the heating device also comprises a plurality of layers of refractory bricks and a water cooling plate which are positioned below the heating platform. The heating device heats the workpiece in a heat conduction mode, and performs heat preservation and slow cooling treatment, so that cracks of the workpiece due to stress concentration can be effectively avoided, the heat conduction heating mode can set a designated temperature, and the temperature error can be controlled in a smaller range; the sliding module is arranged on the heating chamber outer shell to adjust the position of the plasma welding gun, so that the welding gun can be effectively protected.

Description

A heating device in a plasma welding box

technical field

The invention belongs to the technical field of welding equipment, and in particular relates to a heating device in a plasma welding box.

Background technique

Plasma welding is a high-energy beam welding method, which uses high voltage and high-frequency oscillation to break down the air to form a plasma arc, and the plasma arc melts the workpiece to achieve welding. Compared with traditional argon arc welding, plasma welding has the characteristics of high energy density, fast welding speed, large aspect ratio, and small stress deformation.

When the plasma welding method is used, due to the sharp increase in the temperature of the weld and the rapid cooling rate after welding, cracks often occur on the surface of the workpiece and the weld due to stress concentration, especially when the workpiece is a brittle metal material, it is easier to crack. The generation of cracks seriously affects the performance of the workpiece and subsequent applications, and should be avoided. Preheating before welding and heat preservation after welding are usually used to solve the above problems, so it is extremely necessary to equip the welding box with a heating device.

Generally, heating devices can be divided into contact heating and non-contact heating. Chinese patent (publication number: CN102962611A) discloses a dynamic welding device for large-scale thick-walled workpieces, including a heating furnace. The heating furnace is provided with a cylindrical cavity with an open upper end. Insulation layer, several burners are installed on the bottom surface of the bottom insulation layer, and the heat emitted by the burners is used to heat the workpiece. This patent belongs to non-contact heating, which uses rotation to heat the workpiece more uniformly, but it is difficult to control the heating temperature.

Chinese patent (publication number: CN208033953U) discloses a welding heating device, including an upper welding seat and a lower welding seat, and a heating device is arranged inside the upper welding seat and the lower welding seat, and the heating device is a disc induction coil, The lower end of the upper welding seat is provided with a first graphite plate, and the upper end of the lower welding seat is provided with a second graphite plate, and the first and second graphite plates are heated by a disc induction coil to heat the clamped workpiece.

Chinese patent (publication number: CN111055055A) discloses a welding heating device for the inner wall of the cylinder, including an electric heating belt and an elastic steel belt, the electric heating belt is laid on the inner wall of the cylinder along the annular seam, and the elastic steel belt It is curled into a ring and stacked on the electric heating belt, and the electric heating belt is closely attached to the inner wall of the cylinder by utilizing the elasticity of the elastic steel belt.

The above two patents utilize contact heating, but both are aimed at welding workpieces of specific shapes, and lack specific heat preservation measures.

Contents of the invention

The heating device in the plasma welding box provided by the present invention can be placed in the plasma welding box, the fixture is adjusted according to the shape of the workpiece, and a good heat preservation device and a protection device for the plasma welding torch are provided. In addition, the present invention can realize the overall heating of the workpiece and precisely control the heating temperature.

Specifically, the present invention provides a heating device in a plasma welding box, which includes a heating outdoor casing, a plasma torch arranged on the upper end of the heating outdoor casing, a heating platform located in the heating outdoor casing, and a heating platform installed in the heating outdoor casing. Heating tubes on the heating platform;

The heating tube is externally connected to a heating control system, the heating tube is also provided with a temperature monitoring module, the temperature monitoring module is electrically connected to the heating control system, and the temperature monitoring module is used to transmit the temperature signal of the heating tube to the heating control system.

As a further description of the present invention, a plurality of sockets distributed horizontally are arranged on the heating platform, and the heating pipes are assembled in the sockets.

As a further description of the present invention, the heating device also includes multi-layer refractory bricks and water-cooled plates located below the heating platform, the multi-layer refractory bricks are located between the water-cooled plates and the heating platform, and the water-cooled The board is externally connected to a water cooling device.

As a further description of the present invention, the heating platform, the refractory bricks and the water cooling plate are all provided with vertically distributed threaded holes, so that the heating platform, the refractory bricks and the water cooling plate can pass through The screw rods cooperate with the threaded holes to realize connection and fixation.

As a further description of the present invention, the heating device further includes heat insulation cotton and a surrounding board, the heating platform and the refractory brick are connected to the heat insulating cotton around, and the heat insulating cotton is connected to the surrounding board.

As a further description of the present invention, the heating platform is provided with T-shaped grooves.

As a further description of the present invention, the heating outdoor casing includes two parts, the heating chamber upper casing and the heating chamber lower casing, and the heating chamber upper casing is slidably installed on a horizontal moving frame at the upper end of the heating chamber lower casing above, the upper casing of the heating chamber can be moved out of the lower casing of the heating chamber.

As a further description of the present invention, the upper end of the upper shell of the heating chamber is also provided with an opening through which the plasma torch protrudes into the outer shell of the heating chamber, and a sliding module is arranged on one side of the opening, and the sliding mold The group is connected with the upper end of the plasma welding torch, and the sliding module is used to extend the plasma welding torch into and out of the heating outer casing.

As a further description of the present invention, a heat insulating cover plate is also provided on the opening.

As a further description of the present invention, the heating outdoor casing is composed of an inner aluminum silicate plate and an outer metal plate fixedly connected, and heat insulation cotton is inserted between the aluminum silicate plate and the metal plate.

Compared with the prior art, the present invention has the following beneficial technical effects:

Aiming at the problem that traditional plasma welding workpieces are easy to crack, the invention designs a heating device in a plasma welding box. The heating device heats the workpiece by means of heat conduction, and performs heat preservation and slow cooling treatment, which can effectively avoid cracks in the workpiece due to stress concentration. And the heating method of heat conduction can set the specified temperature, and the temperature error can be controlled within a small range, which is of great help to the experimental research; in addition, the heating device is also equipped with a sliding module to adjust the position of the plasma torch, which can effectively protect welding torch.

Description of drawings

Fig. 1 is the structural representation of the heating device in the plasma welding box provided by the present invention;

Fig. 2 is a schematic structural diagram of a sliding module for controlling a plasma torch provided by the present invention.

Explanation of reference signs:

1. The outer shell of the welding box; 11. The upper shell of the heating chamber; 111. The opening; 112. The heat insulation cover; 12. The lower shell of the heating chamber; 2. The plasma welding torch; 3. The heating platform; 31. The T-shaped slot; 32. Threaded hole; 4. Heating pipe; 5. Insulation cotton; 6. Hoarding; 7. Refractory brick;

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The technical solutions of the present invention will be explained below in conjunction with specific embodiments.

As shown in Figure 1, a heating device in a plasma welding box includes a heating outdoor casing 1, a plasma torch 2 arranged on the upper end of the heating outdoor casing 1, and a heating platform located in the heating outdoor casing 1 3 and the heating tube 4 installed on the heating platform 3;

The heating tube 4 is externally connected to a heating control system, and the heating tube 4 is also provided with a temperature monitoring module, the temperature monitoring module is electrically connected to the heating control system, and the temperature monitoring module is used to control the temperature of the heating tube 4 A temperature signal is transmitted to the heating control system.

In order to effectively improve the uniform heating of the heating platform 3 by the heating tube 4 , a plurality of horizontally distributed sockets are arranged on the heating platform 3 , and the heating tube 4 is assembled in the sockets.

In a practicable manner, as shown in FIG. 1, the heating device further includes a multi-layer refractory brick 7 and a water-cooled plate 8 located below the heating platform 3, and the multi-layer refractory brick 7 is located on the water-cooled plate 8. Between the plate 8 and the heating platform 3, the water-cooled plate 8 is externally connected to a water cooling device; the heating device also includes heat insulation cotton 5 and a surrounding board 6, and the heating platform 3 and the refractory brick 7 are connected around Described thermal insulation cotton 5, described thermal insulation cotton 5 is connected with described coaming plate 6 around;

The setting of heat insulation cotton 5 and refractory brick 7 can reduce the heat loss of heating platform 3 and prevent the surrounding board 6 from contacting with heating platform 3 to cause damage; A circulating water cooler is adopted, and the circulating water cooler passes the output cooling water into the water cooling plate 8 to cool it, and then circulates the water carrying heat to the water cooler for cooling.

In order to facilitate the fixed connection of the heating platform 3, the refractory brick 7 and the water-cooling plate 8, as shown in Figure 1, the heating platform 3, the refractory brick 7 and the water-cooling plate 8 are all provided with vertically distributed threads The hole 32 enables the heating platform 3, the refractory brick 7 and the water-cooled plate 8 to be connected and fixed through the threaded hole 32 through a screw.

As shown in FIG. 1 , the heating platform 3 is provided with a T-shaped slot 31 , and the fixture holding the sample to be welded can be easily assembled on the T-shaped slot 31 , and can be moved and changed according to welding needs.

The heating device in the plasma welding box provided by the present invention is placed in the plasma welding box when in use, and the heating control system and the water cooling device are externally connected to the outside of the plasma welding box, which can adjust the position of the fixture according to the shape of the workpiece, In addition, a good heat preservation and water cooling device is set up, which can realize the overall heating of the workpiece and precisely control the heating temperature.

A heating chamber is formed between the heating outdoor shell 1 and the heating platform 3, and the plasma torch 2 needs to be operated in the heating chamber during welding.

In a practicable manner, as shown in FIG. 1 , the heating outdoor casing 1 includes two parts, the heating chamber upper casing 11 and the heating chamber lower casing 12, and the heating chamber upper casing 11 is slidably installed on On the horizontal moving frame at the upper end of the heating chamber lower casing 12, the heating chamber upper casing 11 can be moved out of the heating chamber lower casing 12, thereby exposing the heating chamber for taking samples.

As shown in Figures 1 and 2, an opening 111 is provided at the upper end of the heating chamber upper casing 11, and the plasma torch 2 extends into the heating outer casing 1 through the opening 111, and one side of the opening 111 A sliding module 9 is provided, the sliding module 9 is connected to the upper end of the plasma welding torch 2 , and the sliding module 9 is used to extend the plasma welding torch 2 into and out of the heating outer casing 1 .

When the temperature of the heating platform 3 rises gradually, the plasma torch 2 that has been in the heating chamber for a long time will be damaged due to heat radiation. Therefore, a slide module 9 is installed on one side of the opening 111 on the upper housing 11 of the heating chamber, which can control the lifting of the plasma welding torch 2 and the adjustment of a small displacement in the horizontal direction.

As shown in Figure 2, the opening 111 is also provided with a heat insulating cover 112; in the heating stage, the heat insulating cover 112 is closed, which can effectively prevent the loss of heat. At this time, the plasma torch 2 is located outside the upper shell 11 of the heating chamber. . When welding, open the heat insulation cover plate 112, start the sliding module 9, and put the plasma torch 2 into the heating chamber for welding. After the welding is completed, start the sliding module 9, raise the plasma welding torch 2 to leave the heating chamber, and close the heat insulation cover 112, so as to realize the protection of the plasma welding torch 2.

In order to reduce heat loss and achieve a good heat preservation effect, the heating outdoor casing 1 is composed of an inner aluminum silicate plate and an outer metal plate fixedly connected, and heat insulation cotton is inserted between the aluminum silicate plate and the metal plate 5.

The principle of using the above plasma welding box is as follows:

The heating device provided by the invention is set in an argon-filled plasma welding box when in use, so as to satisfy the requirement that argon gas needs to be fed in as a shielding gas during plasma welding.

Before welding, the upper casing 11 of the heating chamber is moved, the fixture equipped with the workpiece is fixed on the heating platform 3, and then the upper casing 11 of the heating chamber is closed. Start the heating tube 4 and set the specified temperature in the heating control system. After the heating tube 4 reaches the specified temperature, keep warm. Due to heat conduction, the heating platform 3 and the workpiece will gradually heat up and reach the specified temperature. The invention adopts the heating method of heat conduction, and adopts good heat preservation measures, so that the temperature of workpieces during welding can be precisely controlled. After measuring that the workpiece reaches the specified temperature, the plasma torch 2 can be started for welding. After the welding is completed, the workpiece can continue to be kept warm or slowly cooled. During the whole welding process, the samples were in an argon atmosphere.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (5)

1. A heating device in a plasma welding box, characterized in that: it comprises a heating outdoor casing (1), a plasma torch (2) arranged on the upper end of the heating outdoor casing (1), a heating chamber casing located A heating platform (3) in the body (1) and a heating tube (4) installed on the heating platform (3); The heating tube (4) is externally connected to a heating control system, and a temperature monitoring module is also arranged on the heating tube (4), and the temperature monitoring module is electrically connected to the heating control system, and the temperature monitoring module is used to control the The temperature signal of the heating tube (4) is transmitted to the heating control system; The heating device also includes a multi-layer refractory brick (7) and a water-cooled plate (8) located below the heating platform (3), and the multi-layer refractory brick (7) is located between the water-cooled plate (8) and the water-cooled plate (8). Between the heating platforms (3), the water cooling plate (8) is externally connected with a water cooling device; The heating device also includes heat insulation cotton (5) and a coaming (6), the heating platform (3) and the refractory brick (7) are connected around the heat insulation cotton (5), and the heat insulation Cotton (5) is connected with described hoarding (6) around; The heating outdoor casing (1) includes two parts, the heating chamber upper casing (11) and the heating chamber lower casing (12), and the heating chamber upper casing (11) is slidably installed on the heating chamber lower casing (12) On the horizontal moving frame at the upper end, the upper casing (11) of the heating chamber can be moved out of the lower casing (12) of the heating chamber; An opening (111) is also provided at the upper end of the upper shell (11) of the heating chamber, and the plasma torch (2) extends into the outer shell (1) through the opening (111), and the opening (111) ) one side is provided with a sliding module (9), the sliding module (9) is connected to the upper end of the plasma torch (2), and the sliding module (9) is used to extend the plasma torch (2) into and protruding from the heating outdoor casing (1); the sliding module (9) controls the lifting of the plasma welding torch (2) and the small displacement adjustment in the horizontal direction; The heating outdoor casing (1) is composed of an inner aluminum silicate plate and an outer metal plate fixedly connected, and heat insulation cotton (5) is inserted between the aluminum silicate plate and the metal plate; The clamp for clamping the sample to be welded is assembled on the T-shaped slot (31), and moves and changes position according to welding needs. 2. The heating device in the plasma welding box according to claim 1, characterized in that: the heating platform (3) is provided with a plurality of horizontally distributed sockets, and the heating tube (4) is assembled on the sockets inside the hole. 3. The heating device in the plasma welding box according to claim 1, characterized in that: the heating platform (3), the refractory brick (7) and the water cooling plate (8) are all provided with vertical distribution The threaded holes (32) are provided so that the heating platform (3), the refractory bricks (7) and the water-cooled plate (8) can be connected and fixed through screw rods matching the threaded holes (32). 4. The heating device in the plasma welding box according to claim 1, characterized in that: the heating platform (3) is provided with a T-shaped groove (31). 5. The heating device in the plasma welding box according to claim 1, characterized in that: the opening (111) is further provided with a heat insulating cover plate (112).

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