Ring array welding system and welding process for curved pipe surface

Abstract

The invention discloses a ring array welding system for the surface of a curved tube body, comprising an arc plug with an upward end, a lifting part, a horizontal disc seat, an outer ring and an A motor; when the arc plug is movably inserted into the tube inner channel at the lower part of the arc heat exchange tube along the arc path, the arc heat exchange tube enters a tooling state; the upper end of the lifting part is fixedly connected to the horizontal disc seat, and the upper end of the horizontal disc seat is coaxially fixedly connected with a fin guide cone head with a thin upper part and a thick lower part; in the initial state, the outer ring is coaxially connected to the outside of the horizontal disc seat, and the inner side of the outer ring is coaxially rotatably provided with an inner ring; the axis of the arc plug is recorded as the plug axis, the axis of the output shaft of the A motor coincides with the plug axis, and the end of the output shaft is fixedly connected to the inner ring through a rocker arm; a welding machine is installed on the lower side of the outer ring; the invention realizes the automatic welding of the welding structure of the ring fin array on the surface of the curved tube, thereby improving the heat exchange efficiency of the curved part of the U-shaped heat exchange tube.

Description

Technical Field

[0001] The invention belongs to the field of welding technology. Background Art

[0002] Large-sized U-shaped heat exchange tubes are generally welded by two straight tubes and one bent tube. Figure 4 As shown, due to the high process difficulty of array welding of annular heat exchange fins on the curved tube, and the fact that the welding method of the annular fin array on the curved tube surface has not yet been realized in the existing automated welding system, annular heat exchange fins are generally only welded on the outer wall of the straight tube, while the outer wall of the curved part of the U-shaped heat exchange tube has no heat exchange fins, which will cause the problem of insufficient heat exchange efficiency. In this case, a welding system and specific process that can realize automated welding are designed for the welding structure of the annular fin array on the curved tube surface. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a ring array welding system and welding process for the surface of a curved tube body, which realizes the automated welding of the welding structure of the ring fin array on the surface of the curved tube, thereby improving the heat exchange efficiency of the curved part of the U-shaped heat exchange tube.

[0004] Technical solution: To achieve the above purpose, the ring array welding system for the curved tube surface of the present invention comprises an upward arc plug at the end, a lifting part, a horizontal disc seat, an outer ring and a motor; when the arc plug is inserted into the inner channel of the lower part of the arc heat exchange tube along the arc path, the arc heat exchange tube enters the tooling state;

[0005] The upper end of the lifting part is fixedly connected to the horizontal disc seat, and the upper end of the horizontal disc seat is coaxially fixedly connected with a fin guide cone head which is thin at the top and thick at the bottom; in the initial state, the outer ring is coaxially arranged outside the horizontal disc seat, and the inner side of the outer ring is coaxially arranged to rotate; the axis of the arc plug is recorded as the plug axis, the axis of the output shaft of the a motor coincides with the plug axis, and the end of the output shaft is fixedly connected to the inner ring through a rocker arm; a welding machine is installed on the lower side of the outer ring.

[0006] Furthermore, a first arc clamp and a second arc clamp are symmetrically arranged on both sides of the upper part of the horizontal disc seat; a first pair of telescopes and a second pair of telescopes are symmetrically fixedly installed along the radial direction on the inner edge, the ends of the first pair of telescopic rods of the first pair of telescopes are fixedly connected to the first arc clamp, and the ends of the second pair of telescopic rods of the second pair of telescopes are fixedly connected to the second arc clamp; under the drive of the first pair of telescopes and the second pair of telescopes, the first arc clamp and the second arc clamp move towards or away from each other; the inner circles of the first arc clamp and the second arc clamp are respectively provided with a first arc groove and a second arc groove along the arc path.

[0007] Furthermore, the inner diameter of the annular fin to be welded is consistent with the outer diameter of the thick end of the fin guide cone head, and the outer diameter of the horizontal disc seat is between the outer diameter and the inner diameter of the annular fin; when the annular fin is sleeved on the outside of the fin guide cone head, the annular fin will automatically move downward under the guidance of gravity and the fin guide cone head to be coaxially sleeved on the lower end of the fin guide cone head, and the upper surface of the horizontal disc seat supports the annular fin upward.

[0008] Furthermore, a virtual trajectory circle is set, the axis of the virtual trajectory circle coincides with the axis of the plug, and the virtual trajectory circle coincides with the arc center line of the arc plug; when the annular fin is coaxially sleeved on the lower end of the fin guide cone head, and the upper surface of the horizontal disc seat supports the annular fin upward: the welding gun of the welding machine is tilted upward, and the extension line of the welding gun intersects with the inner contour of the annular fin, the first arc clamp and the second arc clamp are close to each other so that the first arc groove and the second arc groove clamp the outer contour of the annular fin on both sides: and the geometric center of the annular fin clamped by the first arc groove and the second arc groove is on the virtual trajectory circle.

[0009] Furthermore, the inner ring of the outer ring and the outer ring of the inner ring are rotationally matched via a bearing.

[0010] Furthermore, the arc curvature of the arc heat exchange tube to be welded is consistent with that of the arc plug, and the outer diameter of the circular cross-section of the arc plug is adapted to the inner diameter of the inner channel of the arc heat exchange tube.

[0011] Furthermore, the upper inner ring of the inner ring has a plurality of transmission teeth distributed along the contour array; the inner ring at the middle height of the inner ring is integrated with an inner edge; and it also includes a gear drive motor, which is fixedly connected to the outer ring through a motor bracket, and the output end of the gear drive motor is driven and connected to a gear, which meshes with the transmission teeth on the inner ring.

[0012] Further, the welding process of the ring array welding system on the curved pipe surface:

[0013] Step 1, putting the arc heat exchange tube into a tooling state;

[0014] Step 2, making the first arc clamping groove and the second arc clamping groove clamp two sides of the outer contour of the annular fin;

[0015] Step 3, the fin guide cone head is lowered to separate from the inner ring of the clamped annular fin;

[0016] Step 4: When the clamped annular fin moves clockwise around the axis of the plug and along the virtual trajectory circle, the counterclockwise end of the arc heat exchange tube passes through the inner ring of the annular fin, so that the annular fin is smoothly sleeved outside the arc heat exchange tube; until the annular fin moves to the outside of the clockwise end of the arc heat exchange tube;

[0017] Step 5: At this time, the welding gun is controlled to spray welding liquid toward the inner contour of the annular fin, and the welding liquid sprayed from the welding gun is scanned along the inner contour path of the annular fin being welded, so as to complete the welding of the first annular fin;

[0018] Step 6, releasing the welded annular fin; the welding machine, the outer ring, the inner ring, the first arc clamp and the second arc clamp are moved together around the plug axis and in the counterclockwise direction along the virtual trajectory circle to the initial position in "step 1";

[0019] Step 7, complete the welding of the next annular fin by referring to the method of "step 2" to "step 5", and keep the next annular fin and the previous annular fin welded at a predetermined distance;

[0020] Step eight, continuously repeat the process of "step seven" to eventually weld a plurality of circular fins distributed in an array along the arc direction onto the outer surface of the arc heat exchange tube.

[0021] Beneficial effects: The present invention realizes the automated welding of the welding structure of the annular fin array on the curved tube surface, so that the outer surface of the circular arc heat exchange tube is automatically welded with a plurality of annular fins distributed in an array along the arc direction, thereby improving the heat exchange efficiency of the curved portion of the U-shaped heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a schematic diagram of the overall welding process of a high-efficiency U-shaped heat exchange tube with a fin array at the bend;

[0023] Attached Figure 2 This is a schematic diagram of the initial state of the welding device of this scheme;

[0024] Attached Figure 3 For attachment Figure 1 A specific flow chart of the welding process of the array ring fins on the curved tube surface;

[0025] Attached Figure 4 It is a schematic diagram of the existing U-shaped heat exchange tube structure. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings. The main problem solved by this solution is as follows: Figure 1 The automated welding and welding consistency issues of the "welding process of the ring array on the curved pipe surface" shown are as follows:

[0027] As attached Figures 1 to 4The ring array welding system for the curved tube body surface shown in the figure includes a base 50, a transverse fixed side column 16 is fixed on one side of the base 50, and the end of the transverse fixed side column 16 is fixedly connected to an end upward arc plug 15: the arc heat exchange tube 26 to be welded has the same arc curvature as the arc plug 15, and the outer diameter of the circular cross-section of the arc plug 15 is adapted to the inner diameter of the inner tube channel 27 of the arc heat exchange tube 26; when the arc plug 15 is movably inserted into the inner tube channel 27 at the lower part of the arc heat exchange tube 26 along the arc path, the arc heat exchange tube 26 enters the tooling state.

[0028] A lifter 19 is provided on the upper side of the base 50, and a horizontal disc seat 21 is fixedly connected to the upper end of the lifting portion 18 of the lifter 19, and a fin guide cone head 20 with a thin upper part and a thick lower part is coaxially fixedly connected to the upper end of the horizontal disc seat 21. The inner diameter of the annular fin 25 to be welded is consistent with the outer diameter of the thick end of the fin guide cone head 20, and the outer diameter of the horizontal disc seat 21 is between the outer diameter and the inner diameter of the annular fin 25; when a robot or a person puts a piece of annular fin 25 on the outside of the fin guide cone head 20, the annular fin 25 will automatically move downward under the guidance of gravity and the fin guide cone head 20 to be coaxially sleeved on the lower end of the fin guide cone head 20, and the upper surface of the horizontal disc seat 21 supports the annular fin 25 upward.

[0029] It also includes an outer ring 1 coaxially arranged outside the horizontal disc seat 21 in the initial state, an inner ring 23 is coaxially arranged inside the outer ring 1, and the inner ring of the outer ring 1 and the outer ring of the inner ring 23 are rotatably matched through a bearing 24; the axis of the arc plug 15 is recorded as the plug axis 90, and it also includes a fixedly installed a motor 10, the axis of the output shaft 11 of the a motor 10 coincides with the plug axis 90, and the end of the output shaft 11 is fixedly connected to the inner ring 23 through a rocker arm 12; a plurality of transmission teeth 7 are distributed along the contour array on the upper inner ring of the inner ring 23; the inner ring at the middle height of the inner ring 23 is integrally provided with an inner edge 22; a welding machine 14 is fixedly installed on the lower side of the outer ring 1 through a welding machine bracket 13, and the welding machine 14 is fixedly installed on the lower side of the outer ring 1 The welding gun 30 of 14 is arranged obliquely upward; it also includes a gear drive motor 33, which is fixedly connected to the outer ring 1 through a motor bracket 32, and the output end of the gear drive motor 33 is drivingly connected to a gear 31, and the gear 31 is meshed with the transmission tooth body 7 on the inner ring 23; when the gear drive motor 33 drives the gear 31 to rotate, the gear 31 and the transmission tooth body 7 on the inner ring 23 perform meshing motion; when the output shaft 11 is stationary, since the inner ring 23 is synchronized with the output shaft 11 and is in a relatively fixed state, according to the principle of relative motion, the outer ring 1 rotates around the axis of the circular fin 25 being welded under the action of the meshing motion, so that the welding gun 30 is displaced with the rotation of the outer ring 1.

[0030] The first arc clamp 4 and the second arc clamp 17 are symmetrically arranged on both sides of the upper part of the horizontal disc seat 21; the first pair of telescopic devices 2 and the second pair of telescopic devices 9 are symmetrically fixedly installed along the radial direction on the inner edge 22, the ends of the first pair of telescopic rods 3 of the first pair of telescopic devices 2 are fixedly connected to the first arc clamp 4, and the ends of the second pair of telescopic rods 8 of the second pair of telescopic devices 9 are fixedly connected to the second arc clamp 17; under the drive of the first pair of telescopic devices 2 and the second pair of telescopic devices 9, the first arc clamp 4 and the second arc clamp 17 move towards or away from each other; the inner circles of the first arc clamp 4 and the second arc clamp 17 are respectively provided with the first arc groove 5 and the second arc groove 6 along the arc path.

[0031] like Figure 2 As shown, a virtual trajectory circle 101 is set, the axis of the virtual trajectory circle 101 coincides with the plug axis 90, and the virtual trajectory circle 101 coincides with the arc center line of the arc plug 15; when the annular fin 25 is coaxially sleeved on the lower end of the fin guide cone head 20, and the upper surface of the horizontal disc seat 21 supports the annular fin 25 upward: the extension line of the welding gun 30 intersects with the inner contour 34 of the annular fin 25, and the first arc clamping jaw 4 and the second arc clamping jaw 17 approach each other so that the first arc clamping groove 5 and the second arc clamping groove 6 clamp the outer contour of the annular fin 25 on both sides: and the geometric center of the annular fin 25 clamped by the first arc clamping groove 5 and the second arc clamping groove 6 is on the virtual trajectory circle 101.

[0032] Working method: Step 1, gradually put the inner tube channel 27 of the clockwise end of the arc heat exchange tube 26 to be welded on the arc plug 15, so that the arc plug 15 is relatively movable along the arc path and inserted into the inner tube channel 27 at the lower part of the arc heat exchange tube 26, so that the arc heat exchange tube 26 enters the tooling state;

[0033] Step 2: A manipulator or a person manually puts a circular fin 25 outside the fin guide cone head 20 and releases it. Under the guidance of gravity and the fin guide cone head 20, the circular fin 25 automatically moves downward to be coaxially sleeved on the lower end of the fin guide cone head 20, and the upper surface of the horizontal disc seat 21 supports the circular fin 25 upward; at this time, the first pair of retractors 2 and the second pair of retractors 9 are controlled to make the first arc clamping jaws 4 and the second arc clamping jaws 17 move closer to each other, so that the first arc clamping groove 5 and the second arc clamping groove 6 clamp the outer contour of the circular fin 25 on both sides, so that the circular fin 25 and the inner ring 23 are coaxial and synchronous, and at this time the geometric center of the circular fin 25 is just on the virtual trajectory circle 101;

[0034] Step 3, controlling the lifting portion 18 of the lifter 19 to retract downward, so that the fin guide cone head 20 is lowered to separate from the inner circle of the annular fin 25 clamped by the first arc clamping jaw 4 and the second arc clamping jaw 17;

[0035] Step 4, control the output shaft 11 of the a motor 10 to rotate clockwise. Driven by the output shaft 11 counterclockwise, the welding machine 14, the outer ring 1, the inner ring 23 and the annular fin 25 clamped by the first arc clamp 4 and the second arc clamp 17 move together around the plug axis 90 and along the clockwise direction of the virtual trajectory circle 101. During the movement of the annular fin 25 around the plug axis 90 and along the clockwise direction of the virtual trajectory circle 101, the counterclockwise end of the arc heat exchange tube 26 passes through the inner ring of the annular fin 25, so that the annular fin 25 is smoothly sleeved on the outside of the arc heat exchange tube 26; as the output shaft 11 continues to rotate clockwise until the annular fin 25 moves to the outside of the clockwise end of the arc heat exchange tube 26, the a motor 10 is paused, and at this time, the extension line of the welding gun 30 intersects with the inner contour 34 of the annular fin 25;

[0036] Step 5: At this time, the welding gun 30 is controlled to spray the welding liquid toward the inner contour 34 of the annular fin 25. At the same time, the gear drive motor 33 drives the gear 31 to rotate, and the gear 31 and the transmission tooth body 7 on the inner ring 23 are meshed. Since the inner ring 23 is fixed, according to the principle of relative motion, the outer ring 1 rotates around the axis of the annular fin 25 being welded under the action of the meshing motion, so that the welding liquid sprayed by the welding gun 30 scans along the path of the inner contour 34 of the annular fin 25 being welded, so that the inner contour 34 of the annular fin 25 being welded is smoothly welded to the outer surface of the clockwise end of the arc heat exchange tube 26, and the welding of the first annular fin 25 is completed;

[0037] Step six, control the first pair of retractors 2 and the second pair of retractors 9 to make the first arc clamp 4 and the second arc clamp 17 move away from each other, so as to release the annular fin 25 that has been welded; then control the output shaft 11 of the a motor 10 to rotate counterclockwise, and driven by the output shaft 11, the welding machine 14, the outer ring 1, the inner ring 23, and the first arc clamp 4 and the second arc clamp 17 are moved together around the plug axis 90 and in the counterclockwise direction along the virtual trajectory circle 101 to the initial position in "step one";

[0038] Step 7, complete the welding of the next annular fin 25 by referring to the method of "step 2" to "step 5", and keep the next annular fin 25 and the previous annular fin 25 welded at a predetermined distance;

[0039] Step eight, continuously repeat the process of "step seven" until the outer surface of the arc heat exchange tube 26 is finally welded with a plurality of annular fins 25 distributed in an array along the arc direction.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Ring array welding system for curved pipe surface, characterized by: It comprises an end-up upward arc plug (15), a lifting part (18), a horizontal disc seat (21), an outer ring (1) and a motor (10); when the arc plug (15) is inserted into the inner tube channel (27) at the lower part of the arc heat exchange tube (26) along the arc path, the arc heat exchange tube (26) enters a tooling state; The upper end of the lifting part (18) is fixedly connected to the horizontal disc seat (21), and the upper end of the horizontal disc seat (21) is coaxially fixedly connected to a fin guide cone head (20) with a thin upper part and a thick lower part; the outer ring (1) is coaxially arranged outside the horizontal disc seat (21) in an initial state, and an inner ring (23) is coaxially arranged inside the outer ring (1); the axis of the arc plug (15) is recorded as the plug axis (90), the axis of the output shaft (11) of the motor (10) coincides with the plug axis (90), and the end of the output shaft (11) is fixedly connected to the inner ring (23) through a rocker arm (12); a welding machine (14) is installed on the lower side of the outer ring (1); A first arc clamping jaw (4) and a second arc clamping jaw (17) are symmetrically arranged on both sides of the upper portion of the horizontal disc seat (21); The inner rings of the first arc clamping jaw (4) and the second arc clamping jaw (17) are respectively provided with a first arc clamping groove (5) and a second arc clamping groove (6) along an arc path; A virtual trajectory circle (101) is provided, the axis of the virtual trajectory circle (101) coincides with the axis of the plug (90), and the virtual trajectory circle (101) coincides with the arc centerline of the arc plug (15); when the annular fin (25) is coaxially sleeved on the lower end of the fin guide cone head (20), and the upper surface of the horizontal disc seat (21) supports the annular fin (25) upward: the welding gun (30) of the welding machine (14) is tilted upward, and the extension line of the welding gun (30) intersects with the inner contour (34) of the annular fin (25), the first arc clamping jaw (4) and the second arc clamping jaw (17) are close to each other so that the first arc clamping groove (5) and the second arc clamping groove (6) clamp the two sides of the outer contour of the annular fin (25); and the geometric center of the annular fin (25) clamped by the first arc clamping groove (5) and the second arc clamping groove (6) is on the virtual trajectory circle (101).

2. The ring array welding system for curved pipe surface according to claim 1, characterized in that: The upper inner ring of the inner ring (23) has a plurality of transmission teeth (7) distributed in an array along the contour; the inner ring at the middle height of the inner ring (23) is integrally provided with an inner edge (22); and further comprises a gear drive motor (33), the gear drive motor (33) being fixedly connected to the outer ring (1) via a motor bracket (32), the output end of the gear drive motor (33) being drivingly connected to a gear (31), the gear (31) being meshed with the transmission teeth (7) on the inner ring (23); A first pair of telescopic devices (2) and a second pair of telescopic devices (9) are symmetrically fixedly mounted on the inner edge (22) along a radial direction; the ends of the first pair of telescopic rods (3) of the first pair of telescopic devices (2) are fixedly connected to the first arc clamping jaws (4); the ends of the second pair of telescopic rods (8) of the second pair of telescopic devices (9) are fixedly connected to the second arc clamping jaws (17); under the drive of the first pair of telescopic devices (2) and the second pair of telescopic devices (9), the first arc clamping jaws (4) and the second arc clamping jaws (17) move toward or away from each other.

3. The ring array welding system for curved pipe surface according to claim 1, characterized in that: The inner diameter of the annular fin (25) to be welded is consistent with the outer diameter of the thick end of the fin guide cone head (20), and the outer diameter of the horizontal disc seat (21) is between the outer diameter and the inner diameter of the annular fin (25); when the annular fin (25) is sleeved outside the fin guide cone head (20), the annular fin (25) will automatically move downward under the guidance of gravity and the fin guide cone head (20) to be coaxially sleeved on the lower end of the fin guide cone head (20), and the upper surface of the horizontal disc seat (21) supports the annular fin (25) upward.

4. The ring array welding system for curved pipe surface according to claim 1, characterized in that: The inner ring of the outer ring (1) and the outer ring of the inner ring (23) are rotationally matched via a bearing (24).

5. The ring array welding system for curved pipe surface according to claim 4, characterized in that: The arc heat exchange tube (26) to be welded has the same arc curvature as the arc plug (15), and the outer diameter of the circular cross section of the arc plug (15) is adapted to the inner diameter of the inner channel (27) of the arc heat exchange tube (26).

6. The welding process of the ring array welding system for the curved pipe surface according to claim 5, characterized in that: Step 1, putting the arc heat exchange tube (26) into a tooling state; Step 2, making the first arc clamping groove (5) and the second arc clamping groove (6) clamp two sides of the outer contour of the annular fin (25); Step 3, the fin guide cone head (20) is lowered to separate from the inner ring of the clamped annular fin (25); Step 4: The clamped annular fin (25) is displaced in a clockwise direction around the plug axis (90) and along the virtual trajectory circle (101), so that the counterclockwise end of the arc heat exchange tube (26) passes through the inner circle of the annular fin (25), so that the annular fin (25) is smoothly sleeved outside the arc heat exchange tube (26); until the annular fin (25) moves to the outside of the clockwise end of the arc heat exchange tube (26); Step 5, at this time, the welding gun (30) is controlled to spray welding liquid toward the inner contour (34) of the annular fin (25), and the welding liquid sprayed by the welding gun (30) is scanned along the path of the inner contour (34) of the annular fin (25) being welded, thereby completing the welding of the first annular fin (25); Step six, releasing the welded annular fin (25); the welding machine (14), the outer ring (1), the inner ring (23), the first arc clamp (4) and the second arc clamp (17) are moved together around the plug axis (90) and in the counterclockwise direction along the virtual trajectory circle (101) to the initial position in "step one"; Step 7, referring to the method of "step 2" to "step 5", complete the welding of the next annular fin (25), and keep the next annular fin (25) at a predetermined distance from the previous annular fin (25) that has been welded; Step eight, continuously repeating the process of "step seven", and finally welding a plurality of circular fins (25) distributed in an array along the arc direction onto the outer surface of the arc heat exchange tube (26).

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