Automatic welding machine and welding method for fan coil unit

Abstract

The present invention discloses an automatic fan coil welding machine and a welding method, comprising a base, the base being provided with an upper mounting plate and a lower mounting plate; the mounting plate being provided with a rotating ring for rotation; the two rotating rings are hinged with a plurality of clamping units axially evenly distributed around the rotating ring; the base is provided with two power members and a telescopic platform for horizontal sliding between the upper mounting plate and the lower mounting plate, a first tension spring is connected between the telescopic platform and the base, and an induction heating element is provided on the telescopic platform; the upper mounting plate is provided with a follower that is wedge-matched with the telescopic platform for lifting and lowering, a first spring is connected between the follower and the upper mounting plate, the follower can overcome the elastic force of the first spring and move downward under the extrusion of the clamping unit, so that the telescopic platform drives the induction heating element to move in a direction away from the base; the melted solder fills the gap between the flared opening and the narrow opening along the conical arc surface and the spiral groove of the flared opening under the action of centrifugal force, thereby realizing welding of the copper pipe, and the welding is tighter, and the welding strength and air tightness are better.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to an automatic welding machine and a welding method for a fan coil unit. Background Art

[0002] Before welding the copper tubes of existing fan coil units, it is often necessary to flare the copper tube to be welded on one side, and then insert the copper tube to be welded on the other side into the flared opening. After completion, brazing is performed, and the molten solder penetrates into the gap formed in the plug-in part under the capillary action to achieve the welding of the copper tubes. Although this welding method can achieve the welding of copper tubes, the solder only relies on capillary action to penetrate. Since there is no gap in the completely abutting position in the plug-in part, the molten solder cannot enter, resulting in reduced welding strength and airtightness. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an automatic fan coil welding machine and welding method, so that the melted solder can fill the gap between the flared opening and the narrow opening along the conical arc surface and spiral groove of the flared opening under the action of centrifugal force, thereby realizing the welding of the copper tube, making the welding tighter, and improving the welding strength and air tightness.

[0004] To achieve the above object, the specific solutions of the present invention are as follows:

[0005] An automatic fan coil welding machine includes a base, wherein the base is provided with an upper mounting plate and a lower mounting plate spaced apart from each other;

[0006] Both mounting plates are provided with rotating rings for rotation; the two rotating rings are coaxially arranged and are hinged with multiple clamping units axially evenly distributed around the rotating rings; the base is provided with two power parts configured to drive the corresponding rotating rings to rotate between the upper mounting plate and the lower mounting plate, and a telescopic platform is provided for horizontal sliding, a first tension spring is connected between the telescopic platform and the base, and an induction heating element is provided on the telescopic platform; the upper mounting plate is provided with a follower that is wedge-shaped and cooperates with the telescopic platform for lifting and lowering, a first spring is connected between the follower and the upper mounting plate, and the follower can overcome the elastic force of the first spring and move downward under the extrusion of the clamping unit, so that the telescopic platform drives the induction heating element to move in a direction away from the base.

[0007] Optionally, the clamping unit includes a clamping body hinged in the middle on a rotating ring, a torsion spring is arranged between the clamping body and the rotating ring, an arc surface is arranged at the inner end of the clamping body, a sliding groove is arranged at the outer end of the clamping body, a counterweight block is provided for sliding in the sliding groove, a second tension spring is connected between the counterweight block and the clamping body, inclined sliding holes are provided on the opposite side walls of the sliding groove, and sliding bosses are provided on the two side walls of the counterweight block that are movably embedded in the inclined sliding holes.

[0008] Optionally, the counterweight block is accommodated in the slide groove under the tension of the second tension spring. When the counterweight block is subjected to centrifugal force, the counterweight block can overcome the tension of the second tension spring and protrude out of the slide groove under the cooperation of the inclined sliding hole and the sliding boss.

[0009] Optionally, the clamping body is in a retracted state under the torsion of the torsion spring, and the angle between the length direction of the clamping body and the radial direction of the rotating ring is the largest; when the rotating ring rotates, the counterweight block protrudes out of the slide slot under the action of centrifugal force, so that the clamping body overcomes the torsion of the torsion spring and swings in a direction that gradually reduces the angle between the length direction of the clamping body and the radial direction of the rotating ring.

[0010] Optionally, the follower includes a follower rod body, a follower plate body fixedly connected to the upper end of the follower rod body, and a push portion fixedly connected to the lower end of the follower rod body; the size of the follower plate body is larger than the maximum rotation radius of the clamping unit; the follower plate body has a through hole, and the follower plate body is sleeved on the outer periphery of the rotating ring through the through hole; the push portion is provided with an inclined surface in contact with the telescopic table; the first spring is sleeved on the follower rod, and its two ends are respectively abutted against the upper mounting plate and the driven plate body.

[0011] Optionally, the rotating ring includes a first ring body, a second ring body connected to one end of the first ring body, and a third ring body connected to the other end of the first ring body; a plurality of hinge shafts evenly distributed around the axial direction are provided on the side of the third ring body facing away from the first ring body, and one end of each hinge shaft away from the third ring body is commonly connected to the same fourth ring body; each clamping body is hinged between the third ring body and the fourth ring body through the hinge shaft, and the two ends of the torsion spring are respectively connected to the hinge shaft and the clamping body.

[0012] Optionally, a mounting portion is provided in the middle of the base, a guide cylinder is protruded from the mounting portion, a first tension spring is provided in the guide cylinder, a guide shaft is protruded from the telescopic platform, the guide shaft is movably inserted into the guide cylinder and abuts against the first tension spring.

[0013] Optionally, the guide cylinder and the guide shaft are form-fitted to limit the rotational freedom of the guide shaft.

[0014] Optionally, the power component is a motor, the output end of the motor is connected to a first friction wheel, and the upper mounting plate and the lower mounting plate are respectively provided with a second friction wheel that rotates between the first friction wheel and the rotating ring, and the power of the first friction wheel is transmitted to the rotating ring through the second friction wheel.

[0015] The present invention also provides a welding method using the above-mentioned fan coil automatic welding machine, which specifically includes the following steps:

[0016] Pre-processing of copper tube expansion: processing a conical arc surface on the inner wall of the copper tube expansion and processing a spiral groove on the conical arc surface;

[0017] Pre-treatment of the narrow end of the copper tube: processing a conical surface on the outer wall of the narrow end of the copper tube;

[0018] Copper tube loading: Insert the flared end of one copper tube to be welded into the rotating ring at the bottom with the flared end facing upwards, and place the spiral solder in the flared end; insert the narrow end of the other copper tube to be welded into the rotating ring at the top with the narrow end facing upwards, and insert the narrow end into the flared end so that the spiral solder is located in the gap between the flared end and the narrow end;

[0019] The power part drives the rotating ring to rotate, and the clamping unit clamps the copper tube to be welded and drives the copper tube to be welded to rotate synchronously;

[0020] Welding heating: The induction heating element extends to the outer wall of the copper tube to be welded, and the induction heating element heats the spiral solder. The spiral solder melts and fills the gap between the flared and narrow openings to weld the copper tube;

[0021] Copper tube cooling: the induction heating element stops heating, and the welded copper tube remains in a rotating state;

[0022] Copper tube unloading: After cooling, the rotating ring stops rotating, and the clamping unit releases the clamping of the copper tube. The welded copper tube can be taken out from the rotating ring to complete the welding.

[0023] The beneficial effects of the present invention are as follows: the present invention utilizes a conical arc surface and a spiral groove to be arranged in the flared mouth of the copper tube, and a conical surface to be arranged in the narrow mouth of the copper tube, and spiral solder is placed in the gap between the flared mouth and the narrow mouth, so that the copper tube is clamped by the clamping unit through the upper and lower rotating rings, so that the copper tube rotates synchronously, and the follower squeezes the telescopic table to drive the induction heating element to be close to the outer wall of the copper tube to heat the spiral solder, so that the melted solder fills the gap between the flared mouth and the narrow mouth along the conical arc surface and the spiral groove of the flared mouth under the action of centrifugal force, thereby realizing the welding of the copper tube, and the welding is tighter, and the welding strength and air tightness are better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the present invention;

[0025] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0026] Figure 3 yes Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0027] Figure 4 This is a schematic structural diagram of the cooperation between the rotating ring and the clamping unit of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the rotating ring of the present invention;

[0029] Figure 6 is a cross-sectional schematic diagram of the clamping unit of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the clamping unit of the present invention extending out of the slide slot;

[0031] Figure 8 It is a structural schematic diagram of the follower of the present invention;

[0032] Explanation of the accompanying drawings: 1. base; 11. upper mounting plate; 12. lower mounting plate; 13. rotating ring; 131. first ring body; 132. second ring body; 133. third ring body; 134. hinge shaft; 135. fourth ring body; 21. clamping body; 211. inclined sliding hole; 22. torsion spring; 23. counterweight; 231. sliding boss; 24. second tension spring; 31. motor; 32. first friction wheel; 33. second friction wheel; 4. telescopic table; 41. first tension spring; 42. induction heating element; 51. driven rod body; 52. driven plate body; 53. pushing part; 531. inclined surface; 54. first spring; 10. flaring; 20. conical arc surface; 30. spiral groove; 40. conical surface; 50. narrow mouth; 60. spiral solder. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0034] like Figures 1 to 8 As shown, the fan coil automatic welding machine described in this embodiment is used for welding copper tubes in a fan coil to weld two copper tubes together. The fan coil automatic welding machine includes a base 1, on which an upper mounting plate 11 and a lower mounting plate 12 are fixedly mounted.

[0035] The upper mounting plate 11 and the lower mounting plate 12 are both rotatably mounted with a rotating ring 13; the two rotating rings 13 are coaxially arranged and are each hinged with a plurality of clamping units evenly distributed axially around the rotating ring 13. The clamping units clamp the copper tube to be welded, thereby driving the copper tube to be welded to rotate synchronously; the base 1 is equipped with two power members configured to drive the corresponding rotating rings 13 to rotate and a telescopic platform 4 mounted for horizontal sliding between the upper mounting plate 11 and the lower mounting plate 12. A first tension spring 41 is connected between the telescopic platform 4 and the base 1, and an induction heating element 42 is mounted on the telescopic platform 4; the upper mounting plate 11 is raised and lowered with a follower that is wedge-fitted with the telescopic platform 4. A first spring 54 is connected between the follower and the upper mounting plate 11. The follower can overcome the elastic force of the first spring 54 under the pressure of the clamping unit and move downward, so that the telescopic platform 4 drives the induction heating element 42 to move away from the base 1. The number of clamping units can be automatically set according to actual usage requirements, such as setting three clamping units.

[0036] Specifically, the base 1 is installed in the external mounting position through a fixing plate, a conical arc surface 20 is set in the flared opening 10 of the copper tube to be welded, and a spiral groove 30 is set on the conical arc surface 20, and a conical surface 40 is set on the outer wall of the narrow opening 50 of the copper tube to be welded. When welding, a copper tube to be welded is placed in the rotating ring 13 below with the flared opening 10 facing upward, and then a spiral solder 60 is placed in the flared opening 10. The diameter of the spiral solder 60 is larger than the inner diameter of the copper tube to be welded and smaller than the inner diameter of the copper tube to be welded. After the spiral solder 60 is placed into the inner diameter of the flared opening 10 of the copper tube to be welded, the spiral solder 60 is locked in the flared opening 10 of the copper tube to be welded. Then, the other copper tube to be welded is placed in the upper rotating ring 13 with the narrow opening 50 facing downward. Then, the narrow opening 50 is inserted into the flared opening 10 of the copper tube to be welded below. At this time, the spiral solder 60 is located in the gap between the outer wall of the narrow opening 50 and the inner wall of the flared opening 10. At this time, the two copper tubes to be welded form a welding area between the narrow opening 50 and the flared opening 10.

[0037] Then the two power members work simultaneously, respectively driving the corresponding rotating ring 13 to rotate synchronously. During the rotation of the rotating ring 13, each clamping unit clamps and fixes the copper pipe to be welded. The rotating ring 13 drives the copper pipe to be welded to rotate synchronously through each clamping unit. During the rotation of each clamping unit located above, a downward pressure is applied to the follower, so that the follower overcomes the elastic force of the first spring 54 and moves downward. During the movement of the follower, the telescopic platform 4 overcomes the tension of the first tension spring 41 and drives the induction heating element 42 toward the welding pipe. The induction heating element 42 moves in the direction of the welding area until it is close to the outer wall of the copper tube to be welded. Then, the induction heating element 42 works to heat the spiral solder 60 in the welding area, so that the spiral solder 60 melts in the flared opening 10. Under the action of centrifugal force, the melted solder rotates closely against the inner wall of the flared opening 10. Since the inner wall of the flared opening 10 is a tapered arc surface 20 and the inner diameter of the flared opening 10 gradually increases from the inside to the outside, the melted solder is subjected to an upward component of force during the rotation process, so that the solder fills the gap upward to weld the copper tube.

[0038] At the same time, since the spiral groove 30 is provided on the inner wall of the flared opening 10, during the rotation of the copper tube to be welded, the melted solder can move up faster along the spiral groove 30, thereby welding the copper tube. Moreover, the solder thickness at the spiral groove 30 is higher than that at other gap positions, thereby increasing the welding strength of the copper tube.

[0039] After welding is completed, the induction heating element 42 stops heating, and the power element further keeps the welded copper tube rotating, so that the solder cools down and the welded copper tube is air-cooled. After cooling, the power element stops working, the clamping unit releases the clamping of the copper tube, and then the welded copper tube is taken out. At the same time, the clamping unit releases the downward pressure on the follower, so that the follower releases the squeezing of the telescopic table 4. The telescopic table 4 drives the induction heating element 42 to retract under the tension of the tension spring, thus completing the welding of the copper tube.

[0040] This embodiment utilizes a conical arc surface 20 and a spiral groove 30 provided in the copper tube flare 10, and a conical surface 40 provided in the copper tube narrow mouth 50, and places the spiral solder 60 in the gap between the flare 10 and the narrow mouth 50, so that the copper tube is clamped by the clamping unit through the upper and lower rotating rings 13, so that the copper tube rotates synchronously, and the follower squeezes the telescopic table 4 to drive the induction heating element 42 to be close to the outer wall of the copper tube to heat the spiral solder 60, so that the melted solder fills the gap between the flare 10 and the narrow mouth 50 along the conical arc surface 20 and the spiral groove 30 of the flare 10 under the action of centrifugal force, thereby realizing the welding of the copper tube, and the welding is tighter, and the welding strength and air tightness are better.

[0041] like Figure 1 、 Figure 2 、 Figure 6 and Figure 7 As shown, in some embodiments of the fan coil automatic welding machine described in this embodiment, the clamping unit includes a clamping body 21 whose middle part is hinged on the rotating ring 13, and a torsion spring 22 is provided between the clamping body 21 and the rotating ring 13. The torsion spring 22 applies torque to the clamping body 21, so that the clamping body 21 is in a retracted state at the beginning, so that the copper tube to be welded can be inserted into the rotating ring 13. The inner end of the clamping body 21 is provided with an arc surface, so that the clamping body 21 can contact the copper tube through the arc surface when swinging, and the outer end of the clamping body 21 is provided with a sliding The chute is provided with a counterweight 23 which slides in the chute. A second tension spring 24 is connected between the counterweight 23 and the clamping body 21. By setting the second tension spring 24, the counterweight 23 is initially accommodated in the chute. The two opposite side walls of the chute are provided with inclined sliding holes 211. The two side walls of the counterweight 23 are provided with sliding bosses 231 which are movably embedded in the inclined sliding holes 211. The inclined sliding holes 211 and the sliding bosses 231 cooperate to provide guidance and limitation for the counterweight 23, so that the counterweight 23 can extend out of the chute when moving under the action of centrifugal force to apply downward pressure on the follower.

[0042] In this embodiment, the counterweight 23 is accommodated in the chute under the tension of the second tension spring 24. When the counterweight 23 is subjected to centrifugal force, the counterweight 23 can overcome the tension of the second tension spring 24 and, in cooperation with the inclined slide hole 211 and the sliding boss 231, protrude out of the chute, exerting downward pressure on the follower. In this embodiment, the clamping body 21 is in a retracted state under the torsion of the torsion spring 22, and the angle between the length of the clamping body 21 and the radial direction of the rotating ring 13 is at its maximum. When the rotating ring 13 rotates, the counterweight 23 is subjected to the centrifugal force and protrudes out of the chute, causing the clamping body 21 to swing in a direction that gradually decreases the angle between the length of the clamping body 21 and the radial direction of the rotating ring 13, overcoming the torsion of the torsion spring 22. That is, when the counterweight 23 slides out of the chute, the counterweight 23 causes the clamping body 21 to swing in a direction radially along the rotating ring 13, thereby clamping and securing the copper tube.

[0043] Specifically, when the rotating ring 13 rotates, the counterweight 23 is subjected to the centrifugal force to overcome the tension of the second tension spring 24 and move outward. The clamping body 21 swings in the radial direction of the rotating ring 13 under the combined action of the centrifugal force and the counterweight 23. During the swinging process, each clamping body 21 gradually contacts the surface of the copper tube through the arc surface and applies an extrusion force to the copper tube. As a result, the copper tube is clamped and fixed under the cooperation of each clamping body 21, so that the rotating ring 13 drives the copper tube to rotate synchronously through each clamping unit, so that the melted solder welds the copper tube under the action of centrifugal force, thereby improving the welding strength and airtightness.

[0044] When the rotating ring 13 stops rotating, the counterweight 23 slides inward into the slide groove under the tension of the second tension spring 24, and the guidance and limiting action of the inclined slide hole 211 and the sliding boss 231, thereby releasing the downward pressure on the follower, and the follower releases the squeezing of the telescopic platform 4. The telescopic platform 4 drives the induction heating element 42 to move away from the copper tube under the elastic force of the first spring 54.

[0045] This embodiment provides a clamping unit hinged on the rotating ring 13, and uses the rotating ring 13 to drive the clamping unit to rotate, thereby clamping and fixing the copper tube. In this way, it can adaptively clamp and fix tubes of different diameters, and the structure is more flexible and more applicable.

[0046] like Figure 1 、 Figure 2 and Figure 8As shown, in an automatic fan coil welding machine described in this embodiment, in some embodiments, the follower includes a follower rod body 51, a follower plate body 52 fixedly connected to the upper end of the follower rod body 51, and a pusher portion 53 fixedly connected to the lower end of the follower rod body 51; the size of the follower plate body 52 is larger than the maximum rotation radius of the clamping unit, so that when the clamping unit is at the maximum rotation radius, the counterweight block 23 can still maintain contact with the follower plate body 52; the follower plate body 52 has a through hole, and the follower plate body 52 is sleeved on the outer periphery of the rotating ring 13 through the through hole; the pusher portion 53 is provided with an inclined surface 531 in contact with the telescopic table 4; the first spring 54 is sleeved on the follower rod, and its two ends are respectively in contact with the upper mounting plate 11 and the driven plate body 52.

[0047] Specifically, when the counterweight 23 extends out of the slide slot and contacts the driven plate 52, as the counterweight 23 extends further, the counterweight 23 applies downward pressure on the driven plate 52, causing the entire follower to move downward relative to the upper mounting plate 11, the first spring 54 is compressed, and the driven plate 52 drives the push portion 53 to move downward through the driven rod 51. Since the push portion 53 contacts the telescopic platform 4 through the inclined surface 531, the push portion 53 pushes the telescopic platform 4 to overcome the tension of the first tension spring 41 and move toward the copper tube, so that the induction heating element 42 is attached to the outer wall of the copper tube, heating the spiral solder 60 in the gap between the flared opening 10 and the narrow opening 50 to weld the copper tube.

[0048] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown, the fan coil automatic welding machine described in this embodiment, in some embodiments, the rotating ring 13 includes a first ring body 131, a second ring body 132 connected to one end of the first ring body 131 and a third ring body 133 connected to the other end of the first ring body 131; the third ring body 133 is provided with a plurality of axially evenly distributed hinge shafts 134 on the side facing away from the first ring body 131, and each hinge shaft 134 is connected to the same fourth ring body 135 at one end away from the third ring body 133; each clamping body 21 is hinged between the third ring body 133 and the fourth ring body 135 through the hinge shaft 134, and the two ends of the torsion spring 22 are respectively connected to the hinge shaft 134 and the clamping body 21. Specifically, the driven plate body 52 is sleeved on the outer circumference of the third ring body 133 through the through hole, and the rotating ring 13 is rotatably connected to the upper mounting plate 11 or the lower mounting plate 12 through the first ring body 131. The second ring body 132 and the third ring body 133 are distributed on both sides of the mounting plate. The clamping body 21 is received between the third ring body 133 and the fourth ring body 135 under the action of the torsion spring 22. At this time, the angle between the length direction of the clamping body 21 and the radial direction of the hinge shaft 134 is the largest. As the rotating ring 13 rotates, the clamping body 21 swings and swings toward the radial direction of the hinge shaft 134 until the length direction of the clamping body 21 coincides with the radial direction of the hinge shaft 134, and the rotation radius of the clamping body 21 is the largest.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments of the fan coil automatic welding machine described in this embodiment, a mounting portion is provided in the middle of the base 1, with a guide cylinder protruding from the mounting portion. A first tension spring 41 is disposed within the guide cylinder, and a guide shaft protruding from the telescopic platform 4 is movably inserted into the guide cylinder and abuts against the first tension spring 41. In this embodiment, the guide cylinder and guide shaft cooperate to provide guidance for the telescopic platform 4, making the movement of the telescopic platform 4 more stable; the guide cylinder is provided to facilitate the installation of the first tension spring 41.

[0050] In the fan coil automatic welding machine described in this embodiment, in some embodiments, the guide cylinder and the guide shaft are matched with each other to limit the rotational freedom of the guide shaft; such an arrangement allows the telescopic platform 4 to reliably drive the induction heating element 42 to extend and rest against the outer wall of the copper tube.

[0051] like Figure 1 and Figure 2 As shown, in the fan coil automatic welding machine described in this embodiment, in some embodiments, the power part is a motor 31, the output end of the motor 31 is connected to the first friction wheel 32, the upper mounting plate 11 and the lower mounting plate 12 are respectively provided with a second friction wheel 33 that rotates between the first friction wheel 32 and the rotating ring 13, and the power of the first friction wheel 32 is transmitted to the rotating ring 13 through the second friction wheel 33.

[0052] Specifically, the second friction wheel 33 is in friction contact with the outer peripheral wall of the second ring body 132. When the motor 31 drives the first friction wheel 32 to rotate, the first friction wheel 32 drives the second friction wheel 33 to rotate. The second friction wheel 33 drives the rotating ring 13 to rotate relative to the mounting plate through the second ring body 132, thereby welding the copper tube.

[0053] like Figures 1 to 8 As shown, this embodiment also provides a welding method using the above-mentioned fan coil automatic welding machine, which specifically includes the following steps:

[0054] Pre-processing the copper tube flaring 10: flaring the copper tube 10 by using a flaring device 10 at the flaring position of the copper tube, thereby increasing the diameter of the copper tube, and processing a conical arc surface 20 on the inner wall of the copper tube flaring 10 and processing a spiral groove 30 on the conical arc surface 20 by using a tap;

[0055] Pre-processing the narrow opening 50 of the copper tube: cutting the narrow opening 50 of the copper tube, using a cutter to cut the outer wall of the narrow opening 50, preferably, the cutting length is equal to the length of the flaring 10, thereby processing a conical surface 40 on the outer wall of the narrow opening 50 of the copper tube, and the maximum diameter of the conical surface 40 is smaller than the inner diameter of the spiral solder 60;

[0056] Copper tube loading: Insert the flared opening 10 of one copper tube to be welded upward into the rotating ring 13 at the bottom, and place the spiral solder 60 in the flared opening 10; insert the narrow opening 50 of another copper tube to be welded upward into the rotating ring 13 at the top, and insert the narrow opening 50 into the flared opening 10, so that the spiral solder 60 is located in the gap between the flared opening 10 and the narrow opening 50;

[0057] The power member drives the rotating ring 13 to rotate, and the rotating ring 13 drives the clamping unit to rotate, so that the clamping unit clamps the copper pipe to be welded and drives the copper pipe to be welded to rotate synchronously;

[0058] Welding heating: During the rotation of the clamping unit, downward pressure is applied to the follower, causing the follower to move downward. The follower squeezes the telescopic platform 4, causing the telescopic platform 4 to overcome the tension of the first tension spring 41 and drive the induction heating element 42 to extend. The induction heating element 42 extends until it is close to the outer wall of the copper tube to be welded. The induction heating element 42 heats the spiral solder 60, and the spiral solder 60 melts. The melted solder rotates closely against the inner wall of the flare 10 under the action of centrifugal force. Since the conical arc surface 20 of the flare 10 is inclined upward, the melted solder is subjected to an upward component of force during the rotation process, causing the solder to fill the gap between the flare 10 and the narrow mouth 50 upward, thereby achieving welding of the copper tube;

[0059] At the same time, part of the solder moves upward along the spiral groove 30, and the solder thickness at the spiral groove 30 is higher than that at other positions, thereby enhancing the welding strength of the copper tube;

[0060] Copper tube cooling: the induction heating element 42 stops heating, and the copper tube keeps rotating, so that the solder cools down. The copper tube after welding is kept in a rotating state for air cooling;

[0061] Copper tube unloading: After cooling, the power component stops working, the rotating ring 13 stops rotating, and the clamping unit releases the clamping of the copper tube. At this time, the welded copper tube can be taken out from the rotating ring 13 to complete the copper tube welding operation.

[0062] This embodiment utilizes a conical arc surface 20 and a spiral groove 30 provided in the copper tube flare 10, and a conical surface 40 provided in the copper tube narrow mouth 50, and places the spiral solder 60 in the gap between the flare 10 and the narrow mouth 50, so that the copper tube is clamped by the clamping unit through the upper and lower rotating rings 13, so that the copper tube rotates synchronously, and the follower squeezes the telescopic table 4 to drive the induction heating element 42 to be close to the outer wall of the copper tube to heat the spiral solder 60, so that the melted solder fills the gap between the flare 10 and the narrow mouth 50 along the conical arc surface 20 and the spiral groove 30 of the flare 10 under the action of centrifugal force, thereby realizing the welding of the copper tube, and the welding is tighter, and the welding strength and air tightness are better.

[0063] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A fan coil automatic welding machine, characterized in that: Applied to the welding of copper tubes in fan coil units, including a base with an upper mounting plate and a lower mounting plate spaced apart from each other; a conical arc surface is provided inside the expanded opening of the copper tube, and a spiral groove is provided on the conical arc surface; a conical surface is provided on the outer wall of the narrow opening of the copper tube; Both mounting plates are provided with rotating rings for rotation; the two rotating rings are coaxially arranged and are hinged with a plurality of clamping units evenly distributed axially around the rotating rings; the base is provided with two power members configured to drive the corresponding rotating rings to rotate between the upper mounting plate and the lower mounting plate, and a telescopic platform is provided for horizontal sliding, a first tension spring is connected between the telescopic platform and the base, and an induction heating element is provided on the telescopic platform; the upper mounting plate is provided with a follower that is wedge-shaped with the telescopic platform for lifting and lowering, and a first spring is connected between the follower and the upper mounting plate. The follower can overcome the elastic force of the first spring and move downward under the squeezing of the clamping unit, so that the telescopic platform drives the induction heating element to move in a direction away from the base; The clamping unit includes a clamping body hinged in the middle on the rotating ring, a torsion spring is provided between the clamping body and the rotating ring, an arc surface is provided at the inner end of the clamping body, a slide groove is provided at the outer end of the clamping body, a counterweight block is provided for sliding in the slide groove, a second tension spring is connected between the counterweight block and the clamping body, oblique sliding holes are provided on the opposite side walls of the slide groove, and sliding bosses are provided on the two side walls of the counterweight block that are movably embedded in the oblique sliding holes; The counterweight block is accommodated in the slide groove under the tension of the second tension spring. When the counterweight block is subjected to centrifugal force, the counterweight block can overcome the tension of the second tension spring and protrude out of the slide groove under the cooperation of the inclined sliding hole and the sliding boss. The clamping body is in a retracted state under the torsion force of the torsion spring, and the angle between the length direction of the clamping body and the radial direction of the rotating ring is at its maximum. When the rotating ring rotates, the counterweight is acted upon by the centrifugal force and protrudes out of the slide slot, causing the clamping body to overcome the torsion force of the torsion spring and swing in a direction that gradually reduces the angle between the length direction of the clamping body and the radial direction of the rotating ring. The follower includes a follower rod body, a follower plate body fixedly connected to the upper end of the follower rod body, and a pusher part fixedly connected to the lower end of the follower rod body; the size of the follower plate body is larger than the maximum rotation radius of the clamping unit; the follower plate body has a through hole, and the follower plate body is sleeved on the outer circumference of the rotating ring through the through hole; the pusher part is provided with an inclined surface in contact with the telescopic table; the first spring is sleeved on the follower rod, and its two ends are respectively in contact with the upper mounting plate and the driven plate body.

2. The fan coil automatic welding machine according to claim 1, characterized in that: The rotating ring includes a first ring body, a second ring body connected to one end of the first ring body, and a third ring body connected to the other end of the first ring body; a plurality of hinge shafts evenly distributed around the axial direction are provided on the side of the third ring body facing away from the first ring body, and the ends of each hinge shaft away from the third ring body are commonly connected to the same fourth ring body; each clamping body is hinged between the third ring body and the fourth ring body through the hinge shaft, and the two ends of the torsion spring are respectively connected to the hinge shaft and the clamping body.

3. The fan coil automatic welding machine according to claim 1, characterized in that: The middle part of the base is provided with a mounting portion, the mounting portion is provided with a guide cylinder, the first tension spring is provided in the guide cylinder, the telescopic platform is provided with a guide shaft, the guide shaft is movably inserted into the guide cylinder and abuts against the first tension spring.

4. The fan coil automatic welding machine according to claim 3, characterized in that: The guide cylinder and the guide shaft are profile-fitted to limit the rotational freedom of the guide shaft.

5. The fan coil automatic welding machine according to claim 1, characterized in that: The power part is a motor, the output end of the motor is connected to the first friction wheel, the upper mounting plate and the lower mounting plate are respectively provided with a second friction wheel that rotates between the first friction wheel and the rotating ring, and the power of the first friction wheel is transmitted to the rotating ring through the second friction wheel.

6. A welding method using the fan coil automatic welding machine according to any one of claims 1 to 5, characterized in that: The steps include: Pre-processing of copper tube expansion: processing a conical arc surface on the inner wall of the copper tube expansion and processing a spiral groove on the conical arc surface; Pre-treatment of the narrow end of the copper tube: processing a conical surface on the outer wall of the narrow end of the copper tube; Copper tube loading: Insert the flared end of one copper tube to be welded into the rotating ring at the bottom with the flared end facing upwards, and place the spiral solder in the flared end; insert the narrow end of the other copper tube to be welded into the rotating ring at the top with the narrow end facing upwards, and insert the narrow end into the flared end so that the spiral solder is located in the gap between the flared end and the narrow end; The power part drives the rotating ring to rotate, and the clamping unit clamps the copper tube to be welded and drives the copper tube to be welded to rotate synchronously; Welding heating: The induction heating element extends to the outer wall of the copper tube to be welded, and the induction heating element heats the spiral solder. The spiral solder melts and fills the gap between the flared and narrow openings to weld the copper tube; Copper tube cooling: the induction heating element stops heating, and the welded copper tube remains in a rotating state; Copper tube unloading: After cooling, the rotating ring stops rotating, and the clamping unit releases the clamping of the copper tube. The welded copper tube can be taken out from the rotating ring to complete the welding.

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