Die casting anti-oxidation brazing system

Abstract

The invention relates to a die casting anti-oxidation brazing system in the technical field of brazing, which comprises an induction heating device, a cover body, a solder ring positioned between a pipe joint to be welded and the end face of a pipe orifice of a die casting, and a positioning sleeve movably matched and inserted with the pipe joint to be welded, and the induction heating device comprises an induction coil sleeved outside the solder ring in a clearance manner; protective gas can be input into the pipe orifice of the die casting through the protective atmosphere supply device; the cover body covers the induction coil, the outer wall of the upper portion of the positioning sleeve is provided with a protruding shoulder correspondingly abutting against the upper end face of a to-be-welded pipe joint, the outer wall of the protruding shoulder is evenly and annularly provided with a plurality of flow dispersing holes penetrating through the inner wall of the positioning sleeve, a pre-pressing spring is connected between the upper end face of the protruding shoulder and the center of the cover bottom in the cover body, and a circle of elastic skirt edge is fixed to the outer wall of a cover opening of the cover body. The bottom of the elastic skirt edge is correspondingly contacted with the corresponding outer wall of the die casting; the anti-oxidation brazing system can further improve the brazing efficiency and the brazing quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brazing, in particular to a die casting anti-oxidation brazing system. BACKGROUND

[0002] It is known that the heat sink used in communication equipment such as 5G base stations needs to be welded with pipe joints for external connection after being assembled by die casting. The welding generally adopts brazing, that is, using a welding gun to melt the solder around the corresponding weld. However, before welding, spot welding is needed for positioning. During brazing, the metal surface is exposed to high temperature, which is easy to form oxides, affecting the welding quality and connection strength. Generally, in order not to interfere with the movement of the welding gun, only protective gas is introduced into the pipe joint for anti-oxidation protection, resulting in incomplete protection. The brazing effect of the communication equipment heat sink still needs to be improved. SUMMARY

[0003] In order to overcome the shortcomings in the background art and solve the existing technical problems, the present application discloses a die casting anti-oxidation brazing system, which can further improve the brazing efficiency and brazing quality.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: A die casting anti-oxidation brazing system, comprising an induction heating device, a cover, a solder ring located between the to-be-welded pipe joint and the end face of the die casting pipe, and a positioning sleeve movably fitted into the to-be-welded pipe joint. The induction heating device comprises an induction coil sleeved on the outside of the solder ring. The die casting pipe can input protective gas through a protective atmosphere supply device. The cover is arranged above the induction coil. The upper outer wall of the positioning sleeve is provided with a shoulder corresponding to the upper end face of the to-be-welded pipe joint. The outer wall of the shoulder is uniformly provided with a plurality of flow holes penetrating the inner wall of the positioning sleeve. A pre-compression spring is connected between the upper end face of the shoulder and the central bottom of the inner cover of the cover. The cover opening outer wall is fixed with a circle of elastic skirt, so that the bottom of the elastic skirt corresponds to the contact with the corresponding outer wall of the die casting.

[0005] Further, the central bottom of the cover is fixed with a limiting column which is adapted to slide and fit the top end of the positioning sleeve.

[0006] Further, the melting point of the positioning sleeve is greater than that of the solder ring. The lower end of the positioning sleeve can be slidably fitted into the die casting pipe.

[0007] Further, the to-be-welded pipe joint and the die casting pipe end face are each provided with a limiting ring groove corresponding to the solder ring.

[0008] Further, the induction heating device comprises a heat insulation member fixed through the cover bottom of the cover body, and the end of the induction coil is sealed through the heat insulation member and connected with the external power supply device and the circulating cooling device.

[0009] Further, the heat insulation member is arranged on one side of the cover body, the induction coil has a non-closed embracing C-shaped structure, and the inner diameter of the induction coil is greater than the maximum diameter of the pipe joint to be welded.

[0010] Further, the protective gas is argon or nitrogen.

[0011] Further, the elastic skirt is made of high-temperature-resistant metal, alloy or composite material.

[0012] Further, the protruding height of the die casting pipe opening is greater than the diameter of the induction coil wire segment.

[0013] Further, the flow distribution holes are uniformly arranged in three or four.

[0014] Due to the adoption of the technical scheme as described above, the present application has the following beneficial effects: The die casting anti-oxidation brazing system disclosed in the present application realizes automatic and accurate welding of the molten filler on the pipe joint to be welded under the auxiliary positioning of the positioning sleeve and the welding and pressing effect of the pre-pressing spring by using the induction heating mode, avoids the spot welding and surrounding steps of the traditional manual welding gun, improves the welding efficiency, provides conditions for realizing the internal and external anti-oxidation protection of the welding position, and enables the system to realize the internal and external coverage and circulation of the protective gas by means of the cover body and the positioning sleeve, so that the welding oxidation can be avoided in all directions and the brazing quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the structural schematic diagram of the embodiment of the present application; Figure 2 is the structural schematic diagram of the positioning sleeve; Figure 3 is the structural schematic diagram of the induction heating device; Figure 4 is the top view of the mounting structure of the induction heating device.

[0016] In the figure: 1, pre-pressing spring; 2, pipe joint to be welded; 3, induction coil; 4, elastic skirt; 5, filler ring; 6, positioning sleeve; 601, shoulder; 602, flow distribution hole; 7, cover body; 8, heat insulation member; 9, limiting column. DETAILED DESCRIPTION

[0017] In the following, the technical solutions of the present application will be described with reference to the accompanying drawings of the embodiments of the present application. In the description, it should be understood that the orientation or position relationship indicated by terms such as "upper", "lower", "front", "back", "left", "right" and the like only corresponds to the accompanying drawings of the present application, and is for the convenience of describing the present application, and does not indicate or imply that the device or element indicated must have a particular orientation.

[0018] In combination with the accompanying drawings Figures 1-4 The die casting anti-oxidation brazing system comprises an induction heating device, a cover body 7, a filler metal ring 5 located between the pipe joint 2 to be welded and the end face of the pipe mouth of the die casting, and a positioning sleeve 6 movably fitted to the pipe joint 2 to be welded. The positioning sleeve 6 can gap fit with the pipe joint 2 to be welded, that is, it can temporarily insert and fix the pipe joint 2 to be welded, and it is also convenient for disassembly and separation. In order to facilitate subsequent welding, generally, when the die casting is formed, the protruding height of the pipe mouth of the die casting is greater than the diameter of the wire segment of the induction coil 3. Of course, even if there is no protruding pipe part, induction welding can also be performed immediately above the filler metal ring 5, but the heating effect of the induction coil 3 is not as good as that of the induction coil 3. The induction heating device comprises an induction coil 3 gap fitted outside the filler metal ring 5, which melts the filler metal ring 5 with a lower melting point by induction heating for welding. According to the needs, the induction heating device comprises a heat insulating member 8 fixedly penetrating the cover bottom of the cover body 7. The end of the induction coil 3 is sealed through the heat insulating member 8 and is correspondingly connected with the external power supply device and the circulating cooling device. The induction coil 3 is fixedly installed on the cover body 7 through the heat insulating member 8 and can move together with the cover body 7. The induction coil 3 is generally of a hollow structure, and the power supply and cooling structure thereof is a prior art, which will not be described in detail here. In addition, the heat insulating member 8 is arranged on one side of the cover body 7, as shown in the accompanying drawings. The induction coil 3 is in a non-closed C-shaped structure, which avoids affecting the corresponding welding of the pipe joint 2 to be welded and the pipe mouth of the die casting. The inner diameter of the induction coil 3 is greater than the maximum diameter of the pipe joint 2 to be welded, so as to facilitate the sleeving and separation of the induction coil 3. The pipe mouth of the die casting can input protective gas through the protective atmosphere supply device. The protective gas is argon or nitrogen. Generally, the protective gas is stored in a gas cylinder and guided into the inner end of the pipe mouth of the die casting for release. Figure 3 and 4 As shown in the accompanying drawings, the induction coil 3 is in a non-closed C-shaped structure, which avoids affecting the corresponding welding of the pipe joint 2 to be welded and the pipe mouth of the die casting. The inner diameter of the induction coil 3 is greater than the maximum diameter of the pipe joint 2 to be welded, so as to facilitate the sleeving and separation of the induction coil 3. The pipe mouth of the die casting can input protective gas through the protective atmosphere supply device. The protective gas is argon or nitrogen. Generally, the protective gas is stored in a gas cylinder and guided into the inner end of the pipe mouth of the die casting for release. The cover body 7 covers the induction coil 3, the upper outer wall of the positioning sleeve 6 is provided with a shoulder 601 abutting the upper end face of the pipe joint 2 to be welded, the pipe joint 2 to be welded is positioned by inserting the shoulder 601, the outer wall of the shoulder 601 is uniformly provided with a plurality of flow holes 602 penetrating the inner wall of the positioning sleeve 6, the protective gas entering from the lower end of the positioning sleeve 6 can be dispersed from the upper end, generally, the flow holes 602 are uniformly provided with three or four; the upper end face of the shoulder 601 and the inner cover bottom of the cover body 7 are connected by the pre-pressing spring 1, the both ends of the pre-pressing spring 1 are fixedly connected, when the solder ring 5 is heated and melted, the cover body 7 can be pressed down to apply welding pressure to the pipe joint 2 to be welded, so as to ensure the connection strength, the pre-pressing spring 1 can play a buffering role to prevent excessive pressure; according to the need, the inner cover bottom of the cover body 7 is fixed with a limiting column 9 matching the top end of the positioning sleeve 6 to prevent the positioning sleeve 6 from shaking only by the pre-pressing spring 1; in addition, in order to ensure that the pipe joint 2 to be welded corresponds to the pipe port of the die casting, the melting point of the positioning sleeve 6 is greater than that of the solder ring 5, so that the positioning sleeve 6 will not be deformed due to high temperature, so that when assembling, the lower end of the positioning sleeve 6 is inserted into the pipe port of the die casting in a sliding fit to be positioned, and then is pulled out after welding is completed; in addition, the pipe joint 2 to be welded and the pipe port end face of the die casting are both provided with a limiting ring groove corresponding to the solder ring 5, so that the solder ring 5 can be positioned; the cover opening outer wall of the cover body 7 is fixed with a ring of elastic skirt 4, so that the bottom of the elastic skirt 4 corresponds to the outer wall of the die casting, the elastic skirt 4 can shield the gap of the cover opening of the cover body 7 before the pipe joint 2 to be welded is welded and pressed down, so as to prevent a large amount of protective gas from flowing away, and at the same time, the elastic skirt 4 can adapt to deformation when the cover body 7 is pressed down; specifically, the elastic skirt 4 is made of high-temperature-resistant metal, alloy or composite material, such as metal rubber, ceramic rubber, tungsten, chromium, etc.

[0019] The die casting anti-oxidation brazing system is implemented, in the welding, the solder ring 5 is placed on the outer end face of the pipe port of the die casting, then the pipe joint 2 to be welded is sleeved on the positioning sleeve 6, then the cover body 7 with the induction heating device is covered, so that the pipe joint 2 to be welded corresponds to the pipe port of the die casting, the corresponding mode can be visual corresponding by using the transparent cover body 7, the lower end of the positioning sleeve 6 can be inserted into the pipe port of the die casting in a sliding fit, the solder ring 5 can be positioned by the limiting ring groove, then the protective gas is introduced into the pipe port of the die casting through the protective atmosphere supply device, the protective gas enters the positioning sleeve 6 and is dispersed from the top, the air is pushed out by the elastic skirt 4, then the induction coil 3 is controlled to be electrified to heat the solder ring 5, in the melting process of the solder ring 5, the cover body 7 is appropriately pressed down, so that the pipe joint 2 to be welded can be connected tightly, at the same time, the elastic skirt 4 is abutted and deformed to prevent excessive loss of the protective gas, after the welding is completed, the cover body 7 is pulled out together with the positioning sleeve 6 and the induction coil 3.

[0020] The part of the present application not described in detail is the state of the art, and it is clear for the person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application; therefore, the above-described embodiments should be considered as exemplary and not limiting, the scope of the present application being defined by the claims appended hereto and not by the above description, and it is intended to encompass all the changes falling within the meaning and the scope of the equivalent elements of the claims, and no figure reference in the claims should be considered as limiting the content of the claim concerned.

Claims

1. A brazing system for preventing oxidation of die-cast parts, characterized in that: The device includes an induction heating device, a cover, a solder ring located between the pipe joint to be welded and the end face of the die-cast part, and a positioning sleeve that is movably adapted to insert into the pipe joint to be welded. The induction heating device includes an induction coil that is spaced outside the solder ring. The end face of the die-cast part can be supplied with protective gas through a protective atmosphere supply device. The cover is placed above the induction coil. The upper outer wall of the positioning sleeve has a shoulder that abuts against the upper end face of the pipe joint to be welded. The outer wall of the shoulder is evenly provided with multiple diffuser holes that extend to the inner wall of the positioning sleeve. A preload spring is connected between the upper end face of the shoulder and the center of the bottom of the cover inside the cover. The outer wall of the cover opening of the cover is fixed with an elastic skirt so that the bottom of the elastic skirt contacts the corresponding outer wall of the die-cast part.

2. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: A limiting post is fixed in the center of the inner bottom of the cover to fit the top of the sliding insertion positioning sleeve.

3. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The melting point of the positioning sleeve is greater than that of the solder ring, and the lower end of the positioning sleeve can slide and be inserted into the die-cast part's nozzle.

4. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: Both the pipe joint to be welded and the end face of the die-casting machine pipe are provided with limiting ring grooves corresponding to the solder ring.

5. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The induction heating device includes a heat insulation component that is fixed through the bottom of the cover, and the end of the induction coil is sealed through the heat insulation component and connected to an external power supply device and a circulating cooling device.

6. The anti-oxidation brazing system for die-cast parts according to claim 5, characterized in that: The heat insulation component is located on one side of the cover, and the induction coil has a non-closed C-shaped structure, with the inner diameter of the induction coil being larger than the maximum diameter of the pipe joint to be welded.

7. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The protective gas is either argon or nitrogen.

8. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The elastic skirt is made of high-temperature resistant metal, alloy or composite material.

9. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The height of the protrusion at the nozzle of the die-cast part is greater than the diameter of the induction coil segment.

10. The anti-oxidation brazing system for die-cast parts according to claim 1, characterized in that: The diffuser ring has three or four uniform rings.

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