Rotary welding preheating device

Abstract

The utility model discloses a rotary welding preheating device which is used for heating a square and round special-shaped pipe fitting, and the square and round special-shaped pipe fitting is provided with a square main body, and a round front end part and a round rear end part which are positioned at two longitudinal ends of the square main body. The rotary welding preheating device comprises a base table, a roller bracket, an induction heating mechanism and a sliding ring heating mechanism, the roller bracket, the induction heating mechanism and the sliding ring heating mechanism are located on the base table, the roller bracket supports the square and round special-shaped pipe fitting and drives the square and round special-shaped pipe fitting to rotate, and the induction heating mechanism heats the round rear end portion when the square and round special-shaped pipe fitting rotates. The slip ring heating mechanism is provided with a fixed ring, a movable ring and a heating sheet attached to the square main body, the movable ring is connected with an external power supply, the fixed ring and the circular front end part synchronously rotate, and the fixed ring is electrically contacted with the movable ring and is electrically connected with the heating sheet; when the square and round special-shaped pipe fitting rotates, an external power source heats the square body through the heating piece. An induction heating mechanism and a sliding ring heating mechanism are combined for heating, so that the effective preheating temperature of the square and round special-shaped pipe fitting in the welding or surfacing process is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary welding preheating devices, in particular to a rotary welding preheating device for square-round special-shaped pipe fittings. Background Art

[0002] In important connecting pipe fittings and container devices in fields such as petroleum and petrochemical, energy and power, such as header pipe sockets, blowout preventers, and production tree valve bodies, due to the need to withstand high pressure, heat resistance, and high temperature, the pipe fittings generally use chromium-nickel-molybdenum alloy steel materials. Such materials are highly thermally sensitive and have good weldability in the preheated state. In the case of low temperature or non-preheated state, due to uneven temperature gradients, cracking may occur during the welding or surfacing process, resulting in the inability to repair the device or application hazards during use. Therefore, in the process of welding or surfacing applications of such workpieces, the process control specifications require preheating at 100-200°C. However, for workpieces with circular and square structures processed by forgings, the method of preheating first and then welding is restricted in terms of overall efficiency and temperature maintenance.

[0003] The prior art uses intermediate frequency induction heating and flame heating methods for preheating after the workpiece is placed. Such methods can meet the synchronous rotary preheating during the welding operation for cylindrical workpieces. However, for square-round structured workpieces, due to the influence of the square area, the height of the preheating coil or the height of the flame must change according to the angle, and a continuous heating effect cannot be obtained. If the resistance heating sheet method is used, the workpiece cannot rotate and can only be welded after being heated to a certain temperature and then insulated. Therefore, such heating methods will overall affect the preheating effect and it is difficult to improve the production operation efficiency. Using this solution has the following disadvantages: First, limited by the structural characteristics of the workpiece, it cannot meet the workpiece structure with both circular and square shapes; second, the combined separated heating method has low preheating efficiency, poor effect, and there are potential explosion and combustion safety hazards.

[0004] Therefore, it is hoped to propose a new rotary welding preheating device to overcome the above defects. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a rotary welding preheating device for square-round special-shaped pipe fittings, which can preheat synchronously during the welding process, improve the continuous operation efficiency and enhance the welding quality assurance.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a rotary welding preheating device, used for heating a square and round special-shaped pipe fitting, the square and round special-shaped pipe fitting is provided with a square body and a round front end and a round rear end respectively located at the longitudinal ends of the square body, the round front end having a longitudinal axis. The rotary welding preheating device comprises a base, a roller bracket and an induction heating mechanism and a slip ring heating mechanism located on the base, the roller bracket is supported on the round front end and the round rear end and drives the square and round special-shaped pipe fitting to rotate around the longitudinal axis, the induction heating mechanism is arranged adjacent to the round rear end and heats the round rear end when the square and round special-shaped pipe fitting rotates. The slip ring heating mechanism is provided with a fixed ring sleeved on the outer circumference of the circular front end portion, a movable ring fixed on the base and a heating plate attached to the side wall of the square body, the movable ring supports the fixed ring and is connected to an external power source, the fixed ring rotates synchronously with the circular front end portion so that the fixed ring rotates relative to the movable ring; the fixed ring electrically contacts the movable ring, and the heating plate is electrically connected to the fixed ring, so that when the square and round special-shaped pipe fittings rotate, the external power source heats the square body through the heating plate.

[0007] In a preferred embodiment, the roller bracket is provided with a roller frame main frame supported on the peripheral wall of the circular rear end portion and a roller frame sub-frame supported on the peripheral wall of the circular front end portion, the slip ring heating mechanism is located between the roller frame main frame and the roller frame sub-frame in the longitudinal direction, and the distance between the roller frame main frame and the roller frame sub-frame is adjustable.

[0008] In a preferred embodiment, the roller frame main frame and the roller frame slave frame are both provided with rollers that contact the peripheral wall of the square and round special-shaped pipe fittings, and the rollers are knurled wheels with sleeves. The roller frame main frame drives the square and round special-shaped pipe fittings to rotate around the longitudinal axis through the rollers.

[0009] In a preferred embodiment, the roller bracket is provided with an anti-axial movement mechanism, and the anti-axial movement mechanism is arranged at both longitudinal ends of the square and round special-shaped pipe fittings.

[0010] In a preferred embodiment, the induction heating mechanism is provided with a C-shaped induction coil partially covering the peripheral wall of the circular rear end portion and an induction heating power supply electrically connected to the C-shaped induction coil, the induction heating power supply is a medium frequency induction heating power supply, and the C-shaped induction coil at least covers half of the peripheral wall of the circular rear end portion.

[0011] In a preferred embodiment, the induction heating mechanism is provided with a displacement mechanism located on the base platform. The C-shaped induction coil is installed on the displacement mechanism and has an openable and closable structure. The displacement mechanism is a cantilever operating frame for adjusting the heating range of the C-shaped induction coil relative to the circular rear end portion.

[0012] In a preferred embodiment, the stationary ring and the circular front end portion are located on the same longitudinal axis. The stationary ring is provided with an annular peripheral wall, a multi-channel conductive output and input circuit located within the annular peripheral wall, and a protective shielding mechanism located on the longitudinal side surface of the annular peripheral wall. The annular peripheral wall and the protective shielding mechanism enclose the conductive output and input circuits within the stationary ring.

[0013] In a preferred embodiment, the moving ring is supported on the bottom end region of the stationary ring and is provided with a contact electrically connected to the external power supply. The contact elastically contacts the conductive output and input circuits.

[0014] In a preferred embodiment, the heating sheet is electrically connected to the conductive output and input circuits and is provided with several resistive sheets connected in series. The resistive sheets are attached to the side wall of the square main body.

[0015] In a preferred embodiment, the diameter of the circular rear end portion is 300 - 1000 mm, and the diameter of the circular front end portion is not greater than 1000 mm.

[0016] Compared with the prior art, the present utility model has the following beneficial effects: The slip ring heating mechanism is provided with a stationary ring sleeved on the outer periphery of the circular front end portion, a moving ring fixed on the base platform, and a heating sheet attached to the side wall of the square main body. The moving ring supports the stationary ring and is connected to an external power supply. The stationary ring rotates synchronously with the circular front end portion so that the stationary ring rotates relative to the moving ring. The stationary ring is in electrical contact with the moving ring, and the heating sheet is electrically connected to the stationary ring, such that when the square-round special-shaped pipe fitting rotates, the external power supply heats the square main body through the heating sheet. The rotary welding preheating device uses a combination of an intermediate frequency induction heating mechanism and a slip ring heating mechanism for heating to obtain an effective preheating temperature during the welding or surfacing process of the square-round special-shaped pipe fitting, thereby improving the operation efficiency and related welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the rotary welding preheating device in the preferred embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Please refer to Figure 1As shown, a preferred embodiment of the present utility model discloses a rotary welding preheating device 100 for heating a square-round special-shaped pipe fitting 200, which meets the requirement of continuously preheating or reheating the workpiece in the welding or surfacing application of the square-round special-shaped pipe fitting 200 (also known as the workpiece). The square-round special-shaped pipe fitting 200 is provided with a square main body 201 and a circular front end portion 202 and a circular rear end portion 203 respectively located at the longitudinal two ends of the square main body 201. The circular front end portion 202 has a longitudinal axis, and the square-round special-shaped pipe fitting 200 can rotate around the longitudinal axis.

[0019] The rotary welding preheating device 100 includes a horizontally placed base 10, a roller bracket 20, an induction heating mechanism 30 located on the base 10, a slip ring heating mechanism 40 connected to the base 10, and a central control system. The roller bracket 20 supports on the circular front end portion 202 and the circular rear end portion 203 and drives the square-round special-shaped pipe fitting 200 to rotate around the longitudinal axis; the induction heating mechanism 30 is arranged adjacent to the circular rear end portion 203 and heats the circular rear end portion 203 when the square-round special-shaped pipe fitting 200 rotates; the slip ring heating mechanism 40 heats the square main body 201 when the square-round special-shaped pipe fitting 200 rotates. At the same time, the central control system integrates the two induction heating methods and the movement adjustment of the roller bracket 20, and is set and controlled through a control interface.

[0020] The roller bracket 20 is a motion device that supports the workpiece and drives rotation, and is provided with a main roller frame 21 that supports the peripheral wall of the circular rear end portion 203 and a secondary roller frame 22 that supports the peripheral wall of the circular front end portion 202. The slip ring heating mechanism 40 is longitudinally located between the main roller frame 21 and the secondary roller frame 22. In this embodiment, the main roller frame 21 actively drives the square-round special-shaped pipe fitting 200 to rotate, the secondary roller frame 22 passively drives the square-round special-shaped pipe fitting 200 to rotate, and the distance between the main roller frame 21 and the secondary roller frame 22 can be adjusted according to the specific length of the square-round special-shaped pipe fitting 200. The roller bracket 20 is also provided with an anti-axial movement mechanism located at the longitudinal two ends of the square-round special-shaped pipe fitting 200 to prevent the square-round special-shaped pipe fitting 200 from axially moving.

[0021] Furthermore, the main roller rack 21 and the auxiliary roller rack 22 are both provided with rollers 23 that contact the peripheral wall of the square-round special-shaped pipe fitting 200. The rollers 23 are metal wheels and further are sleeve-mounted knurled wheels, which have a large frictional force, prevent large axial slipping, and enable quick replacement after wear. At the same time, the wheel pitch and height of the main roller rack 21 and the auxiliary roller rack 22 are adjustable to ensure that the center heights between the two are the same. The main roller rack 21 drives the square-round special-shaped pipe fitting 200 to rotate around the longitudinal axis through the rollers 23. And on the side of the peripheral wall of the square-round special-shaped pipe fitting 200 where there is no roller 23, a conductive copper bar is arranged and tightly pressed by a spring, so as to realize effective conductive welding between the workpiece and the welding equipment.

[0022] In this embodiment, the induction heating mechanism 30 can realize circumferential heating during the rotation of the cylindrical workpiece and can be displaced according to the needs of the heating area. The induction heating mechanism 30 is provided with a C-shaped induction coil 31 that partially covers the peripheral wall of the circular rear end portion 203, an induction heating power supply electrically connected to the C-shaped induction coil 31, and a displacement mechanism 32 located on the base 10. The induction heating power supply is an intermediate-frequency induction heating power supply. The induction heating power supply adopts the intermediate-frequency mode, has a good skin effect heating, a fast heating speed and a large depth, can quickly heat and conduct the heating temperature to a greater depth and area. At the same time, the power of the induction heating can be determined according to the thickness of the workpiece and the requirements of the heating area.

[0023] The C-shaped induction coil 31 covers at least half of the area of the peripheral wall of the circular rear end portion 203. The C-shaped induction coil 31 is customized according to the requirements of the cylindrical workpiece. For workpieces within a certain diameter range (the diameter of the circular rear end portion is 300 - 1000 mm), the same specification can be selected. The C-shaped induction coil 31 has an openable and closable structure, its arc radius can be adjusted, and it can be effectively heated when attached within a certain height range from the workpiece. The C-shaped induction coil 31 is installed on the displacement mechanism 32, and the displacement mechanism 32 is a cantilever operating frame to adjust the heating range of the C-shaped induction coil 31 relative to the circular rear end portion 203. Specifically, the requirements for different diameters and heating ranges can be further met by the up-and-down movement and left-and-right movement of the cantilever.

[0024] The slip ring heating mechanism 40 is provided with a stationary ring 41 sleeved on the outer periphery of the circular front end 202, a moving ring 42 fixed on the base 10, and a heating sheet 43 attached to the side wall of the square main body 201. (The definition of the stationary ring 41 is that its position relative to the square-round special-shaped pipe fitting 200 is fixed; the definition of the moving ring 42 is that it moves relative to the stationary ring 41). The stationary ring 41 and the circular front end 202 are located on the same longitudinal axis. The stationary ring 41 is installed on the workpiece, and the length of the jacking screw can be adjusted according to the diameter of the workpiece. Each set of stationary rings 41 can clamp workpieces within a certain range (the diameter of the circular front end 202 is not greater than 1000 mm). When ensuring reliable and stable clamping of the workpiece, a corresponding screw can be equipped below the maximum size clamped by the stationary ring 41 to meet the heating of workpieces within the clamping range of the workpiece.

[0025] The stationary ring 41 is provided with an annular peripheral wall, a multi-channel conductive output and input circuit located inside the annular peripheral wall, and a protective shielding mechanism located on the longitudinal side surface of the annular peripheral wall. The input voltage of the conductive output and input circuit is 220V AC, and the conductive power depends on the maximum heating power requirement of the heating sheet 43 at the output end. The annular peripheral wall and the protective shielding mechanism enclose the conductive output and input circuit within the stationary ring 41, which can prevent the electric shock risk caused by direct contact of the human body.

[0026] The moving ring 42 supports the stationary ring 41 and is connected to an external power supply. At the same time, the stationary ring 41 is in electrical contact with the moving ring 42, so as to conduct electricity in cooperation with the alternating current of the external power supply. Specifically, the moving ring 42 is supported in the bottom area of the stationary ring 41 and is provided with a contact electrically connected to the external power supply. The contact elastically contacts the conductive output and input circuit, so that the moving ring 42 elastically abuts against the stationary ring 41 through the contact, thereby forming a reliable contact and ensuring good contact and reliable conduction.

[0027] The heating sheet 43 is electrically connected to the stationary ring 41. Specifically, the heating sheet 43 is electrically connected to the conductive output and input circuit and is provided with several mutually connected series resistance sheets. The several resistance sheets have multiple groups of different powers and are attached to the side wall of the square main body 201 by adsorption of a circular permanent magnet to meet the total power requirement of single-channel heating. At the same time, the stationary ring 41 and the circular front end 202 rotate synchronously so that the stationary ring 41 rotates relative to the moving ring 42. When the square-round special-shaped pipe fitting 200 rotates, the external power supply heats the square main body 201 through the heating sheet 43.

[0028] The welding preheating process of the rotary welding preheating device 100 is as follows: First, hoist the square-round special-shaped pipe fitting 200 onto the roller bracket 20, install the fixed ring 41 and the moving ring 42 of the slip ring heating mechanism 40 on the outer periphery of the square-round special-shaped pipe fitting 200, then set the intermediate frequency induction heating parameters of the induction heating mechanism 30, and start the intermediate frequency or resistance heating function as needed; measure the temperature by hand and perform the welding operation, and maintain heating and heat compensation during the welding operation until the operation ends.

[0029] In the present utility model, the slip ring heating mechanism 40 is provided with a fixed ring 41 sleeved on the outer periphery of the circular front end portion 202, a moving ring 42 fixed on the base 10, and a heating sheet 43 attached to the side wall of the square main body 201. The moving ring 42 supports the fixed ring 41 and is connected to an external power supply. The fixed ring 41 rotates synchronously with the circular front end portion 202 so that the fixed ring 41 rotates relative to the moving ring 42. The fixed ring 41 is in electrical contact with the moving ring 42, and the heating sheet 43 is electrically connected to the fixed ring 41, so that when the square-round special-shaped pipe fitting 200 rotates, the external power supply heats the square main body 201 through the heating sheet 43. The rotary welding preheating device 100 uses a combination of an intermediate frequency induction heating mechanism 30 and a slip ring heating mechanism 40 for heating to obtain an effective preheating temperature of the square-round special-shaped pipe fitting 200 during welding or surfacing, thereby improving the operation efficiency and related welding quality.

[0030] In summary, the above is only the preferred embodiment of the present utility model, and should not be used to limit the scope of the present utility model. That is, all simple equivalent changes and modifications made according to the claims and the content of the specification of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. A rotary welding preheating device, used for heating a square and round special-shaped pipe fitting, the square and round special-shaped pipe fitting is provided with a square body and a round front end and a round rear end respectively located at the longitudinal ends of the square body, the round front end having a longitudinal axis; the rotary welding preheating device comprises a base, a roller bracket and an induction heating mechanism and a slip ring heating mechanism located on the base, the roller bracket is supported on the round front end and the round rear end and drives the square and round special-shaped pipe fitting to rotate around the longitudinal axis, the induction heating mechanism is arranged adjacent to the round rear end and heats the round rear end when the square and round special-shaped pipe fitting rotates; characterized in that: The slip ring heating mechanism is provided with a fixed ring sleeved on the outer circumference of the circular front end portion, a movable ring fixed on the base and a heating plate attached to the side wall of the square body, the movable ring supports the fixed ring and is connected to an external power source, the fixed ring rotates synchronously with the circular front end portion so that the fixed ring rotates relative to the movable ring; the fixed ring electrically contacts the movable ring, and the heating plate is electrically connected to the fixed ring, so that when the square and round special-shaped pipe fittings rotate, the external power source heats the square body through the heating plate.

2. The rotary welding preheating device according to claim 1, characterized in that: The roller bracket is provided with a roller frame main frame supported on the peripheral wall of the circular rear end portion and a roller frame sub-frame supported on the peripheral wall of the circular front end portion; the slip ring heating mechanism is located between the roller frame main frame and the roller frame sub-frame in the longitudinal direction, and the distance between the roller frame main frame and the roller frame sub-frame is adjustable.

3. The rotary welding preheating device according to claim 2, characterized in that: The main frame of the roller frame and the auxiliary frame of the roller frame are both provided with rollers contacting the peripheral wall of the square and round special-shaped pipe fittings, and the rollers are knurled wheels with sleeves. The main frame of the roller frame drives the square and round special-shaped pipe fittings to rotate around the longitudinal axis through the rollers.

4. The rotary welding preheating device according to claim 2, characterized in that: The roller bracket is provided with an anti-axial movement mechanism, and the anti-axial movement mechanism is arranged at the longitudinal ends of the square and round special-shaped pipe fittings.

5. The rotary welding preheating device according to claim 1, characterized in that: The induction heating mechanism is provided with a C-shaped induction coil partially covering the peripheral wall of the circular rear end portion and an induction heating power supply electrically connected to the C-shaped induction coil. The induction heating power supply is a medium frequency induction heating power supply, and the C-shaped induction coil at least covers half of the peripheral wall of the circular rear end portion.

6. The rotary welding preheating device according to claim 5, characterized in that: The induction heating mechanism is provided with a displacement mechanism located on the base, the C-shaped induction coil is installed on the displacement mechanism and is an open-and-close structure, and the displacement mechanism is a cantilever operating frame to adjust the heating range of the C-shaped induction coil relative to the circular rear end.

7. The rotary welding preheating device according to claim 1, characterized in that: The fixed ring and the circular front end are located on the same longitudinal axis, and the fixed ring is provided with an annular circumferential wall, a multi-path conductive output and input circuit located within the annular circumferential wall, and a protective shielding mechanism located on the longitudinal side of the annular circumferential wall. The annular circumferential wall and the protective shielding mechanism enclose the conductive output and input circuits within the fixed ring.

8. The rotary welding preheating device according to claim 7, characterized in that: The moving ring is supported on the bottom end area of ​​the fixed ring and is provided with contacts electrically connected to the external power source, and the contacts are elastically in contact with the conductive output and input circuits.

9. The rotary welding preheating device according to claim 7, characterized in that: The heating plate is electrically connected to the conductive output and input loops and is provided with a plurality of resistor plates connected in series, and the resistor plates are attached to the side walls of the square body.

10. The rotary welding preheating device according to claim 1, characterized in that: The diameter of the circular rear end portion is 300-1000 mm, and the diameter of the circular front end portion is not greater than 1000 mm.

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