Automatic brazing device for metal round pipe

Abstract

The application discloses a kind of metal round tube automatic brazing device, base is connected with main workstation, fixture support and brazing support;Self-centering clamp A is connected on fixture support, round tube a is detachably connected on self-centering clamp A;Self-centering clamp B is connected on first feeding mechanism, and round tube b is detachably connected on self-centering clamp B, and first feeding mechanism is connected on main workstation;Round tube b is close to the workstation on the both sides of one end of round tube a respectively connected with second feeding mechanism and third feeding mechanism, and turning mechanism is connected on second feeding mechanism;Brazing material brushing mechanism is connected on third feeding mechanism;Induction brazing equipment is connected on brazing support, and the arc brazing head of induction brazing equipment is concentric with round tube a and round tube b.Compared with prior art, the application can automatically groove processing, butt joint, brazing and other processing to round tube, improve brazing quality and brazing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brazing device, in particular to a metal pipe automatic brazing device. BACKGROUND

[0002] Brazing refers to the welding method that the filler metal and the welding piece are heated to the melting temperature of the filler metal, and then the gap of the solid welding piece is filled with the liquid filler metal to connect the metal.

[0003] In the current mechanical industry field, the brazing of pipes is widely used. The quality of pipe brazing in equipment is crucial, and the requirements for structure brazing in mechanical equipment are becoming higher and higher. The traditional pipe brazing device adopts handheld pipe brazing and manual pipe butt joint, which leads to low brazing quality, poor precision and coaxiality between pipes, and other defects. Under the existing conditions, it is of important engineering application value to invent a metal pipe automatic brazing device to improve the quality of pipe brazing. SUMMARY

[0004] The purpose of the present application is to provide a metal pipe automatic brazing device which can automatically process groove cutting, butt joint and brazing of pipes, thereby improving the brazing quality and efficiency and solving the problems in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A metal pipe automatic brazing device comprises a base, an induction brazing device, a self-centering clamp A, a self-centering clamp B, a turning mechanism and a filler metal brushing mechanism.

[0007] The base is connected with a main workbench, a clamp support and a brazing support, and the brazing support is located on the side between the main workbench and the clamp support.

[0008] The self-centering clamp A is connected to the clamp support, and the pipe a is detachably connected to the self-centering clamp A.

[0009] The self-centering clamp B is connected to the first feeding mechanism, and the pipe b is detachably connected to the self-centering clamp B. The first feeding mechanism is connected to the main workbench, and the first feeding mechanism drives the self-centering clamp B to approach or move away from the pipe a.

[0010] The second feeding mechanism and the third feeding mechanism are respectively connected to the workbench on both sides of one end of the pipe b, the turning mechanism is connected to the second feeding mechanism, the second feeding mechanism drives the turning mechanism to approach or move away from the pipe b, and the turning mechanism processes a groove at one end of the pipe b.

[0011] The brazing material brushing mechanism is connected to the third feeding mechanism, the third feeding mechanism drives the brazing material brushing mechanism to approach or move away from the circular tube b, and the brazing material brushing mechanism can uniformly brush brazing material on the connecting end of the circular tube b which is machined to have a groove, so that the two ends of the circular tube a and the circular tube b are brazed.

[0012] The induction brazing device is connected to the brazing support, and the arc-shaped brazing head of the induction brazing device is concentric with the circular tube a and the circular tube b.

[0013] Further improvement of the present application is that the self-centering clamp A comprises a base, a bidirectional screw is threadedly connected to the top of the base, one end of the bidirectional screw is connected with a first knob, and a left-handed threaded clamping block and a right-handed threaded clamping block with a V-shaped facing are threadedly connected to the bidirectional screw on the inner side of the base; a first guide rod is connected to the inner side of the base, and the left-handed threaded block and the right-handed threaded block are slidingly connected to the first guide rod; the circular tube a is placed between the left-handed threaded clamping block and the right-handed threaded clamping block, and when the first knob is twisted by an operator, the left-handed threaded clamping block and the right-handed threaded clamping block clamp the circular tube a; the self-centering clamp A clamps the circular tube a in a horizontal clamping manner, so that the axis of the circular tube a of different diameters can be kept at the same horizontal height as the axis of the circular tube b after clamping.

[0014] Further improvement of the present application is that the self-centering clamp A comprises a main shaft motor, the main shaft motor is connected to the sliding table of the first feeding mechanism, a three-jaw chuck is connected to the power output end of the main shaft motor, and the three-jaw chuck clamps one end of the circular tube b; the three-jaw chuck drives the circular tube b to rotate, and the second feeding mechanism drives the tool to feed and retreat, so that the machining of the groove at one end of the circular tube b is realized; in addition, the main shaft motor adopts a hollow shaft motor, which facilitates the circular tube b to pass through the main shaft motor.

[0015] Further improvement of the present application is that a water tank is connected to the base, a water pump is connected to the water tank, the suction port of the water pump is communicated with the water tank, the water outlet of the water pump is connected to the hollow brazing head through a water inlet pipe, and the brazing head is connected to the water tank through a backwater pipe; the induction brazing device generates heat through the resistance heating of the copper wire, heats the connecting part of the circular tube a and the circular tube b, promotes the melting and filling of the brazing material, and is provided with the water tank as a water cooling device to assist heat dissipation and temperature control, so as to realize flexible control of temperature rise and fall.

[0016] Further improvement of the present application is that the turning mechanism comprises a transition block, the transition block is connected to the sliding table of the second feeding mechanism, and a tool holder is connected to the transition block, and the tool is detachably connected to the tool holder.

[0017] The further improvement scheme of the present application is that the filler material brushing mechanism comprises a vertical plate, two groups of ear plates are connected to the rear side of the vertical plate, and a driving roller and a driven roller are rotationally connected between the ear plates; a wire feeding motor is connected to the sliding table of the third feeding mechanism, and the wire feeding motor is drivingly connected to the driving roller; a discharge nozzle is connected to the front side of the vertical plate, a heating head is connected to the front end of the discharge nozzle, a wire inlet hole is formed in the vertical plate, and the wire inlet hole is in communication with the outlet of the discharge nozzle; anti-skid lines are arranged on the outer walls of the driving roller and the driven roller, and the outlet of the discharge nozzle is in the shape of an ellipse with the long axis in the horizontal direction. The driving roller rotates under the drive of the wire feeding motor, the filamentary filler material is inserted into the gap between the driving roller and the driven roller, and the forward and reverse rotation of the wire feeding motor can realize the feeding and withdrawing of the filamentary filler material. After the filamentary filler material is fed into the heating head through the wire inlet hole, the filamentary filler material is melted through heating, and the molten filler material can be extruded out of the discharge nozzle through continuous feeding. Since the outlet of the discharge nozzle is in the shape of an ellipse with the long axis in the horizontal direction, the extrusion shape of the molten filler material is an ellipse, which accelerates the filler material feeding time; the third feeding mechanism drives the filler material brushing mechanism to approach the circular pipe b, so as to realize the filler material feeding for the circular pipe b with different diameters.

[0018] The further improvement scheme of the present application is that the auxiliary support mechanism comprises three groups, two groups of which are connected to the clamp supports at the two ends of the self-centering clamp A, and the other group is connected to the main workbench between the turning mechanism and the filler material brushing mechanism, so as to meet the support for the circular pipe a and the circular pipe b with different models and sizes.

[0019] The further improvement scheme of the present application is that the auxiliary support mechanism comprises a support seat and a V-shaped supporting block, the gear shaft of the bevel gear a is threadedly connected to the support seat, and the gear shaft of the bevel gear a is connected to a second knob at one end; the two ends of the V-shaped supporting block are connected to second guide rods, the second guide rods are slidingly connected to the sliding sleeves on the support seat, the gear shaft of the bevel gear b is threadedly connected to the V-shaped supporting block, and the bevel gear b is engaged with the bevel gear a; when the height of the V-shaped supporting block is adjusted, the operator only needs to twist the second knob.

[0020] The further improvement scheme of the present application is that the first feeding mechanism, the second feeding mechanism and the third feeding mechanism are all screw sliding table modules; in addition, the driving motors of the first feeding mechanism, the second feeding mechanism and the third feeding mechanism, and the main shaft motor and the wire feeding motor are all servo motors, so as to realize accurate control during work.

[0021] The present application has the following beneficial effects:

[0022] The metal circular pipe automatic brazing device can automatically process the circular pipe through slotting, butt joint and brazing, and improves the brazing quality and the brazing efficiency.

[0023] The metal pipe automatic brazing device of the present application, the turning mechanism processes the cutting groove at one end of the pipe b, so as to facilitate the brazing material coating mechanism to coat the brazing material, and further ensure the firmness of the welding of the pipe a and the pipe b.

[0024] The metal pipe automatic brazing device of the present application is provided with a water tank as a water cooling device to assist heat dissipation and temperature control, so as to realize flexible control of temperature rise and drop.

[0025] The metal pipe automatic brazing device of the present application, the outlet of the discharge nozzle is in the shape of an ellipse with the long axis in the horizontal direction, so that the extrusion shape of the molten brazing material is an ellipse, which accelerates the brazing material feeding time.

[0026] The metal pipe automatic brazing device of the present application is provided with an auxiliary supporting mechanism, which ensures that the coaxiality of the pipe a and the pipe b meets certain requirements, and can also meet the support of pipes a and b of different models and sizes.

[0027] The metal pipe automatic brazing device of the present application, the drive motors of the first feeding mechanism, the second feeding mechanism and the third feeding mechanism, and the main shaft motor and the wire feeding motor are all servo motors, so as to realize accurate control during work. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0029] Figure 2 It is a schematic diagram of the overall mechanism of the present application.

[0030] Figure 3 It is a top view of the present application.

[0031] Figure 4 It is a schematic diagram of the structure of the self-centering clamp A of the present application.

[0032] Figure 5 It is a schematic diagram of the structure of the auxiliary supporting mechanism of the present application.

[0033] Figure 6 It is a schematic diagram of the structure of the turning mechanism of the present application.

[0034] Figure 7 It is a schematic diagram of the structure of the brazing material coating mechanism of the present application.

[0035] Figure 8 It is a working schematic diagram of the present application.

[0036] In the diagram: 1-Base, 101-Main worktable, 102-Clamp support, 103-Brazing support, 2-Induction brazing equipment, 201-Brazing head, 202-Water tank, 203-Inlet pipe, 204-Return pipe, 3-Self-centering clamp A, 301-Base, 302-Double-actuated screw, 303-First knob, 304-Left-hand threaded clamping block, 305-Right-hand threaded clamping block, 306-First guide rod, 4-Self-centering clamp B, 401-Spindle motor, 402-Three-jaw chuck, 5-Turning mechanism, 501-Transition block, 502-Tool holder, 503-Tool, 6 - Brazing filler metal coating mechanism, 601-Vertical plate, 602-Ear plate, 603-Driving roller, 604-Driven roller, 605-Wire feeding motor, 606-Discharge nozzle, 607-Heating head, 608-Wire feeding hole, 7-Round tube a, 701-Sleeve, 8-Round tube b, 801-Grooving, 9-Auxiliary support mechanism, 901-Support base, 902-V-shaped support block, 903-Bevel gear a, 904-Second knob, 905-Bevel gear b, 906-Second guide rod, 907-Sliding sleeve, 10-First feed mechanism, 11-Second feed mechanism, 12-Third feed mechanism. Implementation

[0037] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1: As Figures 1-7 As shown, an automatic brazing device for metal round tubes includes a base 1, an induction brazing device 2, a self-centering fixture A3, a self-centering fixture B4, a turning mechanism 5, and a brazing filler metal coating mechanism 6. A main worktable 101, a fixture support 102, and a brazing support 103 are connected to the base 1. The brazing support 103 is located on the side between the main worktable 101 and the fixture support 102. The self-centering fixture A3 is connected to the fixture support 102, and a round tube a7 is detachably connected to the self-centering fixture A3. The self-centering fixture B4 is connected to a first feed mechanism 10, and a round tube b8 is detachably connected to the self-centering fixture B4. The first feed mechanism 10 is connected to the main worktable 101 and is driven by the first feed mechanism 10. The self-centering fixture B4 allows the round tube b8 to approach or move away from the round tube a7. The worktables on both sides of the round tube b8 approaching the round tube a7 are respectively connected to the second feed mechanism 11 and the third feed mechanism 12. The turning mechanism 5 is connected to the second feed mechanism 11. The second feed mechanism 11 drives the turning mechanism 5 to approach or move away from the round tube b8. The turning mechanism 5 processes a groove 801 at one end of the round tube b8. The brazing filler metal coating mechanism 6 is connected to the third feed mechanism 12. The third feed mechanism 12 drives the brazing filler metal coating mechanism 6 to approach or move away from the round tube b8. The brazing filler metal coating mechanism 6 can evenly coat the connecting end of the round tube b8 with the groove 801 so as to braze the two ends of the round tube a7 and the round tube b8.

[0039] The induction brazing device 2 is connected to the brazing support 103, and the arc-shaped brazing head 201 of the induction brazing device 2 is concentric with the circular tube a7 and the circular tube b8.

[0040] The self-centering clamp A3 comprises a base 301, a bidirectional screw rod 302 is threadedly connected to the top of the base 301, one end of the bidirectional screw rod 302 is connected with a first knob 303, and a left-handed threaded clamping block 304 and a right-handed threaded clamping block 305 with a V-shaped facing are threadedly connected to the bidirectional screw rod 302 on the inner side of the base 301; a first guide rod 306 is connected to the inner side of the base 301, and the left-handed threaded block and the right-handed threaded block are slidingly connected to the first guide rod 306; the circular tube a7 is placed between the left-handed threaded clamping block 304 and the right-handed threaded clamping block 305, and when the first knob 303 is twisted, the left-handed threaded clamping block 304 and the right-handed threaded clamping block 305 clamp the circular tube a7; the self-centering clamp A3 clamps the circular tube a7 in a horizontal clamping manner, so that the axes of circular tubes a7 with different diameters can be kept at the same horizontal height after clamping.

[0041] The self-centering clamp A3 comprises a main shaft motor 401, the main shaft motor 401 is connected to the sliding table of the first feeding mechanism 10, a three-jaw chuck 402 is connected to the power output end of the main shaft motor 401, and one end of the three-jaw chuck 402 clamps the circular tube b8; the three-jaw chuck 402 drives the circular tube b8 to rotate, and the second feeding mechanism 11 drives the tool 503 to feed and retreat, so that the processing of the groove 801 at one end of the circular tube b8 is realized.

[0042] The base 1 is connected with a water tank 202, the water tank 202 is connected with a water pump, the water suction port of the water pump is communicated with the water tank 202, the water outlet of the water pump is connected with the hollow brazing head 201 through a water inlet pipe 203, and the brazing head 201 is connected with the water tank 202 through a backwater pipe 204; the induction brazing device 2 generates heat through the resistance heating of the copper wire, heats the connection part of the circular tube a7 and the circular tube b8, promotes the melting and filling of the brazing filler metal, and is provided with the water tank 202 as a water cooling device to assist heat dissipation and temperature control, so as to realize flexible control of temperature rise and fall.

[0043] The turning mechanism 5 comprises a transition block 501, the transition block 501 is connected to the sliding table of the second feeding mechanism 11, and a tool seat 502 is connected to the transition block 501, and the tool 503 is detachably connected to the tool seat 502.

[0044] The solder coating mechanism 6 comprises a vertical plate 601, two groups of ear plates 602 connected to the rear side of the vertical plate 601, and a driving roller 603 and a driven roller 604 rotatably connected between the two groups of ear plates 602. A wire feeding motor 605 is connected to the sliding table of the third feeding mechanism 12 and is drivingly connected to the driving roller 603. A discharge nozzle 606 is connected to the front side of the vertical plate 601, a heating head 607 is connected to the front end of the discharge nozzle 606, a wire inlet hole 608 is formed in the vertical plate 601 and is in communication with the outlet of the discharge nozzle 606. Anti-skid patterns are arranged on the outer walls of the driving roller 603 and the driven roller 604, and the outlet of the discharge nozzle 606 is in the shape of an ellipse with the long axis in the horizontal direction. The driving roller 603 rotates under the drive of the wire feeding motor 605, and the wire-shaped solder is inserted into the gap between the driving roller 603 and the driven roller 604. The wire-shaped solder is fed in and out by changing the forward and reverse rotation of the wire feeding motor 605. After the wire-shaped solder is fed into the heating head 607 through the wire inlet hole 608, the wire-shaped solder is melted by heating. The molten solder is extruded out of the discharge nozzle 606 by continuously feeding the wire-shaped solder. Because the outlet of the discharge nozzle 606 is in the shape of an ellipse with the long axis in the horizontal direction, the extruded shape of the molten solder is an ellipse, which speeds up the solder feeding time. The third feeding mechanism 12 drives the solder coating mechanism 6 to approach the circular pipe b8, so as to realize the solder feeding for the circular pipe b8 with different diameters.

[0045] The auxiliary support mechanism 9 comprises three groups, two of which are connected to the clamp supports 102 at the two ends of the self-centering clamp A3, and the other is connected to the main workbench 101 between the turning mechanism 5 and the solder coating mechanism 6, so as to meet the support for the circular pipe a7 and the circular pipe b8 with different sizes.

[0046] The auxiliary support mechanism 9 comprises a support seat 901 and a V-shaped supporting block 902. The gear shaft of the bevel gear a 903 is threadedly connected to the support seat 901, and one end of the gear shaft of the bevel gear a 903 is connected to a second knob 904. The two ends of the V-shaped supporting block 902 are connected to second guide rods 906, the second guide rods 906 are slidingly connected to the sliding sleeves 907 on the support seat 901, the gear shaft of the bevel gear b 905 is threadedly connected to the V-shaped supporting block 902, and the bevel gear b 905 is engaged with the bevel gear a 903. When adjusting the height of the V-shaped supporting block 902, the operator only needs to twist the second knob 904.

[0047] The first feeding mechanism 10, the second feeding mechanism 11 and the third feeding mechanism 12 are all lead screw sliding table modules. In addition, the driving motors of the first feeding mechanism 10, the second feeding mechanism 11 and the third feeding mechanism 12, as well as the main shaft motor 401 and the wire feeding motor 605 are all servo motors, so as to realize accurate control during work.

[0048] The specific working principle of the present application is as follows:

[0049] As Figure 8 shown, in operation, round pipe a7 and round pipe b8 are clamped on self-centering clamp A3 and self-centering clamp B4 respectively, the sleeve 701 end on the round pipe a7 should be placed as much as possible in the middle region of the heating head 607 of the induction brazing device 2, and the device starts to work. The first feeding mechanism 10 drives the round pipe b8 to move, and the device is provided with a laser displacement sensor, which can monitor the initial position (axial coordinate -182 mm) of the round pipe b8. After the round pipe b8 moves 32 mm, the joint end of the round pipe b8 moves to the machining position of the cutter 503 (axial coordinate -150 mm), and the first feeding mechanism 10 stops working. The main shaft motor 401 works to drive the round pipe b8 to rotate, at this time, the cutter 503 realizes tool feeding through the driving of the second feeding mechanism 11, and processes the brazing end of the high-speed rotating round pipe b8 to cut out a groove 801, and in turn completes the tool retraction, the round pipe b8 feeding driven by the first feeding mechanism 10, tool feeding, etc., and processes multiple grooves 801 on the brazing end of the round pipe b8. After the groove 801 is completed, the first feeding mechanism 10 drives the round pipe b8 to continue to move to the brazing end, and stops when the brazing end of the round pipe b8 moves to the position of the discharge nozzle 606 of the brazing material brushing mechanism 6 (axial coordinate -80 mm), the main shaft motor 401 drives the round pipe b8 to rotate at a low speed, and slides to the right at a low speed under the driving of the first feeding mechanism 10, cooperates with the molten brazing material extruded at the discharge nozzle 606 of the brazing material brushing mechanism 6 to brush the brazing material, and uniformly applies the brazing material after the brazing material is uniformly applied, the main shaft motor 401 stops rotating, and the first feeding mechanism 10 drives the round pipe b8 to continue to move to the sleeve 701 end, and the brazing material gradually solidifies during the movement. The round pipe a7 in this embodiment has an installation deviation, the laser displacement sensor measures that the axial coordinate of the sleeve 701 end of the round pipe a7 is 2.5 mm, and it is calculated that the round pipe b8 needs to move 92.5 mm (2.5 mm-(-80 mm)+10 mm). After the round pipe b8 moves horizontally by 92.5 mm, the brazing end of the round pipe b8 with a 10 mm long groove 801 is placed in the sleeve 701 of the round pipe a7. After the butt joint is completed, the induction brazing device 2 starts to preheat and heat, so that the brazing material applied in advance is uniformly filled into the gap between the round pipe a7 and the round pipe b8 through capillary action; after the heating is completed, the water tank 202 of the induction brazing device 2 circulates water to enter the heating ring to cool down, and the brazing is completed. After the brazing is completed, the three-jaw chuck 402 is loosened, and the first feeding mechanism 10 drives the three-jaw chuck 402 to retreat; the first knob 303 on the self-centering clamp A3 is loosened, at this time, the welded round pipe is supported by the main workbench 101 and the auxiliary supporting mechanism 9 on the clamp support 102, and then the welded round pipe is taken out from above.

[0050] Compared with the common brazing round pipe, the brazing round pipe with the cutting groove 801 in the embodiment has a smaller residual stress under the same external load. It is calculated that the common brazing round pipe has a maximum stress of 20.7 MPa under the same tensile load of 3 MPa, while the brazing round pipe in the embodiment has a maximum stress of 14.6 MPa, which proves that the brazing round pipe in the embodiment has higher reliability. In addition, the brazing residual stress of the common brazing round pipe and the brazing round pipe with the cutting groove 801 is compared. The maximum residual stress of the common brazing round pipe is 417 MPa, while the maximum stress of the new brazing round pipe in the embodiment is 317 MPa, which is reduced by nearly one fourth. At the same time, the butt joint and brazing by the clamp instead of manual butt joint and handheld brazing make the coaxiality of the brazing round pipe higher and the gap more uniform.

[0051] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic brazing device for metal round tubes, characterized in that: It includes a base (1), an induction brazing equipment (2), a self-centering fixture A (3), a self-centering fixture B (4), a turning mechanism (5), and a brazing filler coating mechanism (6); The base (1) is connected to a main workbench (101), a fixture support (102) and a brazing support (103), with the brazing support (103) located on the side between the main workbench (101) and the fixture support (102). The self-centering clamp A (3) is connected to the clamp support (102), and the round tube a (7) is detachably connected to the self-centering clamp A (3); The self-centering fixture B (4) is connected to the first feeding mechanism (10), the round tube b (8) is detachably connected to the self-centering fixture B (4), the first feeding mechanism (10) is connected to the main worktable (101), and the first feeding mechanism (10) drives the self-centering fixture B (4) to make the round tube b (8) approach or move away from the round tube a (7); The second feed mechanism (11) and the third feed mechanism (12) are respectively connected to the worktables on both sides of the end of the circular tube b (8) close to the circular tube a (7). The turning mechanism (5) is connected to the second feed mechanism (11). The second feed mechanism (11) drives the turning mechanism (5) to approach or move away from the circular tube b (8). The brazing filler coating mechanism (6) is connected to the third feed mechanism (12), and the third feed mechanism (12) drives the brazing filler coating mechanism (6) to approach or move away from the circular tube b (8). The induction brazing device (2) is connected to the brazing support (103), and the arc-shaped brazing head (201) of the induction brazing device (2) is concentric with the round tube a (7) and the round tube b (8); The turning mechanism (5) includes a transition block (501), which is connected to the slide of the second feed mechanism (11), and a tool holder (502) is connected to the transition block (501), and the cutting tool (503) is detachably connected to the tool holder (502). The brazing filler metal coating mechanism (6) includes a vertical plate (601), with two sets of upper and lower ear plates (602) connected to the rear side of the vertical plate (601). A driving roller (603) and a driven roller (604) are rotatably connected between the ear plates (602). A wire feeding motor (605) is connected to the slide of the third feeding mechanism (12), and the wire feeding motor (605) is driven and connected to the driving roller (603). A discharge nozzle (606) is connected to the front side of the vertical plate (601), and a heating head (607) is connected to the front end of the discharge nozzle (606). A wire inlet hole (608) is opened on the vertical plate (601), and the wire inlet hole (608) is connected to the outlet of the discharge nozzle (606). The outer walls of the active roller (603) and the driven roller (604) are provided with anti-slip texture, and the outlet of the discharge nozzle (606) is elliptical with its major axis in the horizontal direction; The spindle motor (401) drives the round tube b (8) to rotate at a low speed and slides to the right at a low speed under the drive of the first feed mechanism (10). The molten brazing filler metal squeezed out from the discharge nozzle (606) of the brazing filler metal coating mechanism (6) is used for brushing. After the brazing filler metal is evenly coated, the spindle motor (401) stops rotating and the first feed mechanism (10) drives the round tube b (8) to continue moving towards the end of the sleeve (701). During the movement, the brazing filler metal gradually solidifies.

2. The automatic brazing device for metal round tubes as described in claim 1, characterized in that: The self-centering clamp A (3) includes a base (301), a double-ended screw (302) threaded on the top of the base (301), a first knob (303) connected to one end of the double-ended screw (302), and a left-hand threaded clamping block (304) and a right-hand threaded clamping block (305) with V-shaped opposing surfaces threaded on the double-ended screw (302) inside the base (301); a first guide rod (306) is connected inside the base (301), and the left-hand threaded block and the right-hand threaded block slide on the first guide rod (306).

3. An automatic brazing device for metal round tubes as described in claim 1 or 2, characterized in that: The self-centering fixture A (3) includes a spindle motor (401), which is connected to the slide of the first feed mechanism (10). The power output end of the spindle motor (401) is connected to a three-jaw chuck (402).

4. The automatic brazing device for metal round tubes as described in claim 3, characterized in that: A water tank (202) is connected to the base (1), and a water pump is connected to the water tank (202). The water pump's suction port is connected to the water tank (202), and the water pump's outlet is connected to the hollow brazing head (201) through the water inlet pipe (203). The brazing head (201) is connected to the water tank (202) through the water return pipe (204).

5. The automatic brazing device for metal round tubes as described in claim 1, characterized in that: It also includes an auxiliary support mechanism (9), which consists of three sets. Two sets are connected to the fixture supports (102) at both ends of the self-centering fixture A (3), and the other set is connected to the main worktable (101) between the turning mechanism (5) and the brazing filler coating mechanism (6).

6. The automatic brazing device for metal round tubes as described in claim 5, characterized in that: The auxiliary support mechanism (9) includes a support base (901) and a V-shaped support block (902). The gear shaft of bevel gear a (903) is threadedly fitted to the support base (901). One end of the gear shaft of bevel gear a (903) is connected to a second knob (904). The two ends of the V-shaped support block (902) are connected to a second guide rod (906). The second guide rod (906) is slidably fitted to a sliding sleeve (907) on the support base (901). The gear shaft of bevel gear b (905) is threadedly fitted to the V-shaped support block (902), and bevel gear b (905) meshes with bevel gear a (903).

7. The automatic brazing device for metal round tubes as described in claim 1, characterized in that: The first feed mechanism (10), the second feed mechanism (11) and the third feed mechanism (12) are all lead screw slide modules.

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