Automatic fan coil welding machine and welding method

Abstract

The invention discloses an automatic fan coil welding machine and a welding method. The automatic fan coil welding machine comprises a base, and the base is provided with an upper mounting plate and a lower mounting plate; a rotating ring is rotationally arranged on the mounting plate; the two rotating rings are hinged to a plurality of clamping units evenly distributed in the axial direction of the rotating rings. The base is provided with two power pieces between the upper mounting plate and the lower mounting plate and is provided with a telescopic table in a horizontal sliding manner, a first tension spring is connected between the telescopic table and the base, and an induction heating piece is arranged on the telescopic table; a driven piece matched with the telescopic table in a wedge shape is arranged on the upper mounting plate in a lifting mode, a first spring is connected between the driven piece and the upper mounting plate, and the driven piece can overcome the elastic force of the first spring to move downwards under extrusion of the clamping unit, so that the telescopic table drives the induction heating piece to move in the direction away from the base; the gap between the flaring and the narrow opening is filled with melted welding flux along the conical arc face of the flaring and the spiral groove under the action of centrifugal force, welding of the copper pipe is achieved, welding is tighter, and the welding strength and the air tightness are better.

Description

Technical Field

[0001] The 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 expand the copper tube to be welded on one side, and then insert the copper tube to be welded on the other side into the expanded opening, and then braze it. The molten solder penetrates into the gap formed at the plug-in position 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 close position in the plug-in position, the molten solder cannot enter, resulting in reduced welding strength and air tightness. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a fan coil automatic 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, the welding is tighter, and the welding strength and air tightness are better.

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

[0005] An automatic fan coil welding machine comprises 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 a plurality of clamping units evenly distributed 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 table is provided for horizontal sliding, a first tension spring is connected between the telescopic table and the base, and an induction heating element is provided on the telescopic table; the upper mounting plate is provided with a follower that is wedge-matched with the telescopic table 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 table drives the induction heating element to move in a direction away from the base.

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

[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 in cooperation with the inclined slide 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 the 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 respectively 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 protruding from the mounting portion, a first tension spring is provided in the guide cylinder, a guide shaft is protruding from the telescopic platform, and 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 profile-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 rotating 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 comprises the following steps:

[0016] Pretreatment 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] Pretreatment of the narrow mouth of the copper tube: processing a conical surface on the outer wall of the narrow mouth of the copper tube;

[0018] Copper tube loading: insert the expanded end of one copper tube to be welded into the rotating ring at the bottom with the expanded end facing upwards, and place the spiral solder in the expanded end; insert the narrow end of another 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 expanded end, so that the spiral solder is located in the gap between the expanded 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, and the spiral solder melts and fills the gap between the flared opening and the narrow opening 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 arranges a conical arc surface and a spiral groove in the expanded mouth of the copper tube, arranges a conical surface in the narrow mouth of the copper tube, and places the spiral solder in the gap between the expanded 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 induction heating element is driven by the follower to squeeze the telescopic table to heat the spiral solder against the outer wall of the copper tube, so that the melted solder fills the gap between the expanded mouth and the narrow mouth along the conical arc surface and the spiral groove of the expanded 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 stereogram 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 local enlarged schematic diagram of the middle A;

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

[0028] Figure 5 It is a schematic structural 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 It 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 in conjunction with the accompanying drawings and specific embodiments, but the implementation scope 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 applied to the copper pipe welding in the fan coil to weld two copper pipes together. The fan coil automatic welding machine includes a base 1, and the base 1 is fixedly installed with an upper mounting plate 11 and a lower mounting plate 12 spaced apart from each other.

[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 both hinged with a plurality of clamping units evenly distributed around the rotating ring 13 axially, and the copper tube to be welded is clamped by the clamping units to drive the copper tube to be welded to rotate synchronously; the base 1 is equipped with two power members configured to drive the corresponding rotating ring 13 to rotate and a telescopic table 4 is horizontally slidably installed between the upper mounting plate 11 and the lower mounting plate 12, and a first tension spring 41 is connected between the telescopic table 4 and the base 1, and an induction heating element 42 is installed on the telescopic table 4; the upper mounting plate 11 is lifted and lowered with a follower that is wedge-matched with the telescopic table 4, and a first spring 54 is connected between the follower and the upper mounting plate 11, and the follower can overcome the elastic force of the first spring 54 and move downward under the extrusion of the clamping unit, so that the telescopic table 4 drives the induction heating element 42 to move in a direction away from the base 1. The number of clamping units can be automatically set according to actual use 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, and the diameter of the spiral solder 60 is larger than the inner diameter of the copper tube to be welded and smaller than After the spiral solder 60 is placed into the inner diameter of the expanded opening 10 of the copper tube to be welded, the spiral solder 60 is stuck in the expanded opening 10 of the copper tube to be welded, and then another copper tube to be welded is placed in the upper rotating ring 13 with the narrow opening 50 facing downward, and then the narrow opening 50 is inserted into the expanded 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 expanded opening 10. At this time, the two copper tubes to be welded form a welding area between the narrow opening 50 and the expanded opening 10;

[0037] Then, the two power members work simultaneously, and respectively drive the corresponding rotating ring 13 to rotate synchronously. During the rotation process of the rotating ring 13, each clamping unit clamps and fixes the copper tube to be welded. The rotating ring 13 drives the copper tube to be welded to rotate synchronously through each clamping unit. During the rotation process, each clamping unit located at the top applies downward pressure to the driven member, so that the driven member overcomes the elastic force of the first spring 54 and moves downward. During the movement process of the driven member, the telescopic platform 4 overcomes the tension of the first tension spring 41 and drives the induction heating element 42 toward the welding The induction heating element 42 moves in the direction of the welding area until the induction heating element 42 is close to the outer wall of the copper tube to be welded, and 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, and the melted solder rotates closely against the inner wall of the flared opening 10 under the action of centrifugal force. Since the inner wall of the flared opening 10 is a conical 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 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, and 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] In this embodiment, a conical arc surface 20 and a spiral groove 30 are set in the expanded mouth 10 of the copper tube, a conical surface 40 is set in the narrow mouth 50 of the copper tube, and a spiral solder 60 is placed in the gap between the expanded mouth 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 induction heating element 42 is driven by the follower to press the telescopic table 4 to heat the spiral solder 60 against the outer wall of the copper tube, so that the melted solder fills the gap between the expanded mouth 10 and the narrow mouth 50 along the conical arc surface 20 and the spiral groove 30 of the expanded mouth 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 arranged 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 storage 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 A counterweight block 23 is provided in the slide groove for sliding movement, and a second tension spring 24 is connected between the counterweight block 23 and the clamping body 21. By setting the second tension spring 24, the counterweight block 23 is initially accommodated in the slide groove, and the two opposite side walls of the slide groove are provided with inclined slide holes 211, and the two side walls of the counterweight block 23 are provided with sliding bosses 231 that are movably embedded in the inclined slide holes 211. The inclined slide holes 211 and the sliding bosses 231 cooperate to provide guidance and limit for the counterweight block 23, so that the counterweight block 23 can extend out of the slide groove when moving under the action of centrifugal force to apply downward pressure to the follower.

[0042] In this embodiment, the counterweight 23 is accommodated in the slide groove under the tension of the second tension spring 24. When the counterweight 23 is subjected to the centrifugal force, the counterweight 23 can overcome the tension of the second tension spring 24 and protrude out of the slide groove under the cooperation of the inclined slide hole 211 and the slide boss 231, exerting downward pressure on the follower. In this embodiment, the clamping body 21 is in a storage state under the torsion of the torsion spring 22, and the angle between the length direction of the clamping body 21 and the radial direction of the rotating ring 13 is the largest; when the rotating ring 13 rotates, the counterweight 23 protrudes out of the slide groove under the centrifugal force, so that the clamping body 21 overcomes the torsion of the torsion spring 22 and swings in the direction that gradually reduces the angle between the length direction of the clamping body 21 and the radial direction of the rotating ring 13, that is, when the counterweight 23 slides out of the slide groove, the counterweight 23 makes the clamping body 21 swing in the direction along the radial direction of the rotating ring 13 to clamp and fix the copper tube.

[0043] Specifically, when the rotating ring 13 rotates, the counterweight 23 is subjected to the centrifugal force to overcome the pulling force of the second tension spring 24 and moves outward, and 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, so that 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 air tightness;

[0044] When the rotating ring 13 stops rotating, the counterweight 23 slides inwardly into the slide groove under the tension of the second tension spring 24 and the guiding and limiting effects 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 table 4. The telescopic table 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, so as to clamp and fix 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 driven rod body 51, a driven plate body 52 fixedly connected to the upper end of the driven rod body 51, and a push portion 53 fixedly connected to the lower end of the driven rod body 51; the size of the driven 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 driven plate body 52; the driven plate body 52 has a through hole, and the driven plate body 52 is sleeved on the outer periphery of the rotating ring 13 through the through hole; the push portion 53 is provided with an inclined surface 531 in contact with the telescopic table 4; the first spring 54 is sleeved on the driven rod, and the two ends are respectively abutted against 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 to the driven plate 52, causing the entire driven member to move downward relative to the upper mounting plate 11, and the first spring 54 is compressed. 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 table 4 through the inclined surface 531, the push portion 53 pushes the telescopic table 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, in an automatic fan coil 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 one end of each hinge shaft 134 away from the third ring body 133 is commonly connected to the same fourth ring body 135; each clamping body 21 is respectively 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 where the hinge shaft 134 is located is the largest. As the rotating ring 13 rotates, the clamping body 21 swings and swings toward the radial direction where the hinge shaft 134 is located until the length direction of the clamping body 21 coincides with the radial direction where the hinge shaft 134 is located, and the rotation radius of the clamping body 21 is the largest.

[0049] like Figure 1 and Figure 2 As shown, in the fan coil automatic welding machine described in this embodiment, in some embodiments, a mounting portion is provided in the middle of the base 1, a guide cylinder is convexly provided on the mounting portion, a first tension spring 41 is provided in the guide cylinder, and a guide shaft is convexly provided on the telescopic platform 4, which is movably inserted into the guide cylinder and abuts against the first tension spring 41. In this embodiment, the guide cylinder and the guide shaft are provided to cooperate, thereby providing guidance for the telescopic platform 4, so that the movement of the telescopic platform 4 is 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 table 4 to reliably drive the induction heating element 42 to extend to 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 a first friction wheel 32, the upper mounting plate 11 and the lower mounting plate 12 are respectively provided with a second friction wheel 33 rotating 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 expansion 10: expanding the copper tube 10, expanding the copper tube 10 at the expansion position of the copper tube by an expander 10, increasing the diameter of the copper tube, and processing a conical arc surface 20 on the inner wall of the expansion of the copper tube 10 and processing a spiral groove 30 on the conical arc surface 20 by 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, so that a conical surface 40 is processed 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 a copper tube to be welded upward into the rotating ring 13 located 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 located 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 to make the follower move downward. The follower squeezes the telescopic table 4, so that the telescopic table 4 overcomes the tension of the first tension spring 41 and drives the induction heating element 42 to extend. The induction heating element 42 extends 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 flared opening 10 under the action of centrifugal force. Since the conical arc surface 20 of the flared opening 10 is inclined upward, the melted solder is subjected to an upward component force during the rotation process, so that the solder is filled upward into the gap between the flared opening 10 and the narrow opening 50, 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, and the copper tube after welding keeps rotating for air cooling;

[0061] Copper tube unloading: After cooling, the power part 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] In this embodiment, a conical arc surface 20 and a spiral groove 30 are set in the expanded mouth 10 of the copper tube, a conical surface 40 is set in the narrow mouth 50 of the copper tube, and a spiral solder 60 is placed in the gap between the expanded mouth 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 induction heating element 42 is driven by the follower to press the telescopic table 4 to heat the spiral solder 60 against the outer wall of the copper tube, so that the melted solder fills the gap between the expanded mouth 10 and the narrow mouth 50 along the conical arc surface 20 and the spiral groove 30 of the expanded mouth 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: The base comprises an upper mounting plate and a lower mounting plate which are spaced apart from each other; 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 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 table is provided for horizontal sliding, a first tension spring is connected between the telescopic table and the base, and an induction heating element is provided on the telescopic table; the upper mounting plate is provided with a follower that is wedge-matched with the telescopic table 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 table drives the induction heating element to move in a direction away from the base.

2. The fan coil automatic welding machine according to claim 1, characterized in that: The clamping unit includes a clamping body whose middle part is hinged 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 slidingly arranged in the sliding groove, a second tension spring is connected between the counterweight block and the clamping body, inclined sliding holes are arranged on the opposite side walls of the sliding groove, and sliding bosses that are movably embedded in the inclined sliding holes are arranged on the two side walls of the counterweight block.

3. The fan coil automatic welding machine according to claim 2, characterized in that: The counterweight block is accommodated in the slide groove under the tension of the second tension spring. When the counterweight block is subjected to the 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 slide hole and the slide boss.

4. The fan coil automatic welding machine according to claim 3, characterized in that: 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 groove 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.

5. The fan coil automatic welding machine according to claim 1, characterized in that: 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 periphery 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 the two ends are respectively abutted against the upper mounting plate and the follower plate body.

6. The fan coil automatic welding machine according to claim 2, 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 arranged 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 respectively 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.

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

8. The fan coil automatic welding machine according to claim 7, characterized in that: The guide cylinder and the guide shaft are matched with each other to limit the rotational freedom of the guide shaft.

9. 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 a first friction wheel, and the upper mounting plate and the lower mounting plate are respectively provided with a second friction wheel rotating 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.

10. A welding method using the fan coil automatic welding machine according to any one of claims 1 to 9, characterized in that: The steps include: Pretreatment 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; Pretreatment of the narrow mouth of the copper tube: processing a conical surface on the outer wall of the narrow mouth of the copper tube; Copper tube loading: insert the expanded end of one copper tube to be welded into the rotating ring at the bottom with the expanded end facing upwards, and place the spiral solder in the expanded end; insert the narrow end of another 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 expanded end, so that the spiral solder is located in the gap between the expanded 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, and the spiral solder melts and fills the gap between the flared opening and the narrow opening 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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