Rotary welding preheating device

Abstract

The invention 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 invention relates to the technical field of rotary welding preheating devices, in particular to a rotary welding preheating device for square and round special-shaped pipe fittings. Background Art

[0002] In the fields of petroleum, petrochemical, energy and electricity, etc., important connecting pipes and container devices, such as header pipe seats, blowout preventers, and Christmas tree valve bodies, pipes are generally made of chromium-nickel-molybdenum alloy steel materials because they need to withstand high pressure, heat resistance, and high temperature resistance. This type of material has strong thermal sensitivity and good weldability in the preheated state. At low temperatures or without preheating, the uneven temperature gradient will cause cracking during welding or surfacing, making the device unable to be repaired or causing hidden dangers during use. Therefore, in the process control specifications for welding or surfacing applications of such workpieces, preheating of 100 to 200°C is required. However, for workpieces with round and square structures processed by forgings, the method of preheating before welding is restricted in terms of comprehensive efficiency and temperature maintenance.

[0003] The existing technology uses medium frequency induction heating and flame heating to preheat the workpiece after it is placed. This type of method can meet the synchronous rotation preheating during the welding operation for cylindrical workpieces, but for square and round structure workpieces, due to the influence of the square area, the preheating coil height or flame height must be changed according to the angle, and continuous heating cannot be obtained; if a resistance heating plate method is used, the workpiece cannot be rotated, and can only be heated to a certain temperature before being welded. Therefore, this type of heating method will affect the preheating effect as a whole and it is difficult to improve the production efficiency. Therefore, the use of this solution has the following disadvantages: First, it is limited by the structural characteristics of the workpiece and cannot meet the common workpiece structure of the round and square; second, the combination of separate heating methods has low preheating efficiency and poor effect, and there is a safety hazard of explosion.

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

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

[0006] To achieve the above-mentioned purpose, the present invention 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, 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.

[0012] In a preferred embodiment, the fixed ring and the circular front end portion 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, and the annular circumferential wall and the protective shielding mechanism enclose the conductive output and input circuits within the fixed ring.

[0013] In a preferred embodiment, the movable ring is supported on the bottom end region 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.

[0014] In a preferred embodiment, the heating plate is electrically connected to the conductive output and input circuits 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.

[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 invention has the following beneficial effects: the slip ring heating mechanism is provided with a fixed ring sleeved on the outer circumference of the circular front end, a moving ring fixed on the base, and a heating plate attached to the side wall of the square body, the moving ring supports the fixed ring and is connected to an external power source, the fixed ring rotates synchronously with the circular front end so that the fixed ring rotates relative to the moving ring; the fixed ring electrically contacts the moving 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. The rotary welding preheating device adopts a combination of a medium frequency induction heating mechanism and a slip ring heating mechanism for heating, so as to obtain an effective preheating temperature of the square and round special-shaped pipe fittings during welding or surfacing, thereby improving the working efficiency and related welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a rotary welding preheating device in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0018] See also Figure 1As shown, a preferred embodiment of the present invention discloses a rotary welding preheating device 100, which is used to heat a square round special-shaped pipe fitting 200, and meets the need for continuous preheating or supplementary heating of the workpiece in the welding or surfacing application of the square round special-shaped pipe fitting 200 (also called a workpiece). The square round special-shaped pipe fitting 200 is provided with a square body 201 and a circular front end portion 202 and a circular rear end portion 203 respectively located at the longitudinal ends of the square body 201, the circular front end portion 202 having 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 and 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 is supported on a circular front end 202 and a circular rear end 203 and drives the square and round special-shaped pipe fittings 200 to rotate around the longitudinal axis; the induction heating mechanism 30 is arranged adjacent to the circular rear end 203 and heats the circular rear end 203 when the square and round special-shaped pipe fittings 200 rotate; the slip ring heating mechanism 40 heats the square body 201 when the square and round special-shaped pipe fittings 200 rotate. At the same time, the central control system integrates the two induction heating methods and the movement adjustment of the roller bracket 20, and sets and controls them through a control interface.

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

[0021] Furthermore, the main roller frame 21 and the secondary roller frame 22 are both provided with rollers 23 that contact the peripheral wall of the square and round special-shaped pipe fittings 200. The rollers 23 are metal wheels and further are knurled wheels with sleeves, which have large friction and can prevent large axial slippage and rapid replacement after wear. At the same time, the main roller frame 21 and the secondary roller frame 22 can also be adjustable in wheelbase and height to ensure that the center heights between the two are consistent. The main roller frame 21 drives the square and round special-shaped pipe fittings 200 to rotate around the longitudinal axis through the rollers 23, and a conductive copper rod is set on the side of the peripheral wall of the square and round special-shaped pipe fittings 200 without the rollers 23 and is tightened by a spring, so that effective conductive welding between the workpiece and the welding equipment can be achieved.

[0022] In this embodiment, the induction heating mechanism 30 can realize circular heating of the cylindrical workpiece during its rotation, and can be moved according to the needs of the heating area. The induction heating mechanism 30 is provided with a C-shaped induction coil 31 partially covering 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, and the induction heating power supply is a medium frequency induction heating power supply. The induction heating power supply adopts a medium frequency method, has a good skin effect heating, a fast heating speed, a large depth, can heat quickly and conduct the heating temperature to a larger depth and area. At the same time, the power of 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 peripheral wall of the circular rear end portion 203. The C-shaped induction coil 31 is customized according to the requirements of cylindrical workpieces. For workpieces within a certain diameter range (the diameter of the circular rear end portion is 300 to 1000 mm), the same specification can be selected. The C-shaped induction coil 31 is an open-and-close structure, and its arc radius can be adjusted, and it can be effectively heated when attached to a certain height range from the workpiece. The C-shaped induction coil 31 is installed on a 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 needs of different diameters and heating ranges can be further met by rising and falling, and moving the cantilever left and right.

[0024] 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 movable ring 42 fixed on the base 10, and a heating plate 43 attached to the side wall of the square body 201 (the fixed ring 41 is defined as being fixed relative to the square and round special-shaped pipe fitting 200; the movable ring 42 is defined as being movable relative to the fixed ring 41). The fixed ring 41 and the circular front end portion 202 are located on the same longitudinal axis. The fixed ring 41 is installed on the workpiece, and the length of the tightening screw can be adjusted according to the diameter of the workpiece. Each set of fixed rings 41 can meet the clamping of workpieces within a certain range (the diameter of the circular front end portion 202 is not greater than 1000mm). Under the condition of ensuring reliable and stable clamping of the workpiece, the fixed ring 41 can be equipped with corresponding screws below the maximum clamping size to meet the heating of the workpiece within the clamping range.

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

[0026] The moving ring 42 supports the fixed ring 41 and is connected to an external power source. At the same time, the fixed ring 41 electrically contacts the moving ring 42, so that the AC power of the external power source is matched with the fixed ring 41 for electrical conduction. Specifically, the moving ring 42 is supported on the bottom end area of ​​the fixed ring 41 and is provided with a contact electrically connected to the external power source. The contact is elastically in contact with the conductive output and input circuits, so that the moving ring 42 is elastically abutted against the fixed ring 41 through the contact, thereby forming a reliable contact, ensuring good contact and reliable electrical conduction.

[0027] The heating plate 43 is electrically connected to the fixed ring 41. Specifically, the heating plate 43 is electrically connected to the conductive output and input circuits and is provided with a plurality of resistor plates connected in series. The plurality of resistor plates have a plurality of groups of different powers and are attached to the side wall of the square body 201 by adsorption of circular magnetic steel to meet the total power requirement of single-channel heating. At the same time, the fixed ring 41 and the circular front end 202 rotate synchronously to make the fixed ring 41 rotate relative to the moving ring 42, so that when the square and round special-shaped pipe fittings 200 rotate, the external power source heats the square body 201 through the heating plate 43.

[0028] The welding preheating process of the rotary welding preheating device 100 is as follows: first, hoist the square and round special-shaped pipe fittings 200 onto the roller bracket 20, install the fixed ring 41 and the movable ring 42 of the slip ring heating mechanism 40 to the outer periphery of the square and round special-shaped pipe fittings 200, and then set the medium frequency induction heating parameters of the induction heating mechanism 30, and start the medium frequency or resistance heating function as needed; measure the temperature by hand and perform the welding operation, and keep heating and supplementing heat during the welding operation until the operation is completed.

[0029] In the present invention, the slip ring heating mechanism 40 is provided with a fixed 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 plate 43 attached to the side wall of the square body 201, the moving ring 42 supports the fixed ring 41 and is connected to an external power source, and the fixed ring 41 rotates synchronously with the circular front end 202 so that the fixed ring 41 rotates relative to the moving ring 42. The fixed ring 41 is electrically in contact with the moving ring 42, and the heating plate 43 is electrically connected to the fixed ring 41, so that when the square and round special-shaped pipe fittings 200 rotate, the external power source heats the square body 201 through the heating plate 43. The rotary welding preheating device 100 adopts the combination of the medium frequency induction heating mechanism 30 and the slip ring heating mechanism 40 for heating, so as to obtain the effective preheating temperature of the square and round special-shaped pipe fittings 200 during welding or surfacing, thereby improving the working efficiency and the relevant welding quality.

[0030] In summary, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention. That is, all simple equivalent changes and modifications made according to the claims and description of the present invention should still fall within the scope of the patent of the present invention.

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; Features: 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, Features: 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, Features: 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, Features: 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, Features: 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, Features: 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, Features: 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, Features: 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, Features: The heating sheet is electrically connected to the conductive output and input loops and is provided with a plurality of resistor sheets connected in series, and the resistor sheets are attached to the side walls of the square body.

10. The rotary welding preheating device according to claim 1, Features: 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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