High frequency induction brazing welding device and method

Abstract

The present invention relates to a high-frequency induction brazing welding device, including a bracket fixture, an induction coil and a contact lifting device. The bracket fixture clamps the bracket and exposes the welding position of the bracket to the outside of the bracket fixture. The contact lifting device is located above the bracket welding position and lifts the contact located at the bracket welding position. The induction coil is located below the bracket welding position. The contact lifting device first lifts the contact to a certain height. After the induction coil heats the brazing material located at the bracket welding position to a completely molten state, the contact lifting device lowers the contact to the welding height and discharges the bubbles. By adopting the above scheme, the present invention provides a high-frequency induction brazing welding device with improved welding quality, which mainly solves the defect problem that the existing contact welding surface is concave, resulting in poor welding area of ​​the contact assembly.

Description

Technical Field

[0001] The invention relates to the field of electric contact assembly welding equipment, in particular to a high-frequency induction brazing welding equipment, and also to a method using the equipment. Background Art

[0002] In the welding process of electrical contact assemblies, e.g. Figure 1 The electrical contact assembly shown in the figure includes a bracket a and a contact b welded to the bracket a. To ensure that the contact does not shift due to boiling of the brazing flux during welding, the clamping device we often use consists of two silicon nitride ceramic rods that clamp up and down. This welding process has a great impact on the assembly gap and exhaust during welding, so it puts forward higher requirements on the flatness of the contact welding surface. The electrical contact assembly is the most critical electrical contact component in the low-voltage electrical switch. The welding quality of the contact assembly largely determines the service life of the switch. Therefore, solving the welding quality of the contact assembly is the primary problem faced by all technicians. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a high-frequency induction brazing welding device with improved welding quality, which mainly solves the defect problem that the existing contact welding surface is sunken, resulting in poor welding area of ​​the contact assembly.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: it includes a bracket clamp, an induction coil and a contact lifting device, the bracket clamp clamps the bracket and exposes the welding position of the bracket to the outside of the bracket clamp, the contact lifting device is located above the bracket welding position and lifts the contact located at the bracket welding position, the induction coil is located below the bracket welding position, the contact lifting device first lifts the contact to a certain height, and after the induction coil heats the solder located at the bracket welding position to a completely molten state, the contact lifting device lowers the contact to the welding height and discharges the bubbles.

[0005] By adopting the above technical solution, the contact is lifted to reserve heating space for the solder. After the solder is heated to a completely molten state, the contact is pressed down to keep it flat and exhaust all bubbles, thereby ensuring the contact welding quality. The soldering rate of the product after welding can reach more than 90%. At the same time, the production efficiency is improved and the welding quality consistency is good.

[0006] The present invention is further configured as follows: the contact lifting device includes a pressure rod cylinder, a pressure rod seat, a negative pressure pressure rod and a pressure rod guide rail, the pressure rod guide rail is vertically arranged, the pressure rod seat moves on the pressure rod guide rail, the pressure rod cylinder drives the pressure rod seat to move, the pressure rod seat is provided with a spring sleeve for the negative pressure pressure rod to vertically pass through, the spring sleeve is provided with a spring cavity surrounding the negative pressure pressure rod, the outer periphery of the negative pressure pressure rod is provided with a pressure ring that moves vertically in the spring cavity, an extrusion spring that squeezes the pressure ring downward is compressed and arranged between the pressure ring and the spring cavity, the lower end of the negative pressure pressure rod is adapted to the shape of the contact, the negative pressure pressure rod is vertically penetrated with a negative pressure hole, the upper end of the negative pressure hole is connected to the negative pressure source, and the lower end forms a negative pressure that sucks the contact.

[0007] By adopting the above technical solution, on the one hand, the negative pressure hole forms a stable, uniform and continuous negative pressure, and the shape of the lower end of the negative pressure rod matches the contact, so that the lifting and lowering of the contact is smoother. On the other hand, during the downward pressure of the contact, the extrusion spring can effectively slow down the downward pressure progress, thereby exhausting the bubbles and further improving the contact welding quality.

[0008] The present invention is further configured to include a pre-alignment device, which includes an alignment clamp and a clamp cylinder for driving the alignment clamp to open and close. When the alignment clamp is closed, a lifting channel for the contact point is formed.

[0009] By adopting the above technical solution, the alignment clamping claws keep the relative position of the contact with the bracket unchanged except the vertical direction, thereby ensuring the alignment accuracy of the contact with the bracket during the lifting and lowering process and ensuring the quality of the finished product.

[0010] The present invention is further configured to include a supporting device, wherein the supporting device includes a supporting rod and a supporting cylinder for driving the supporting rod to rise and fall, and the top end of the supporting rod passes through the induction coil and abuts against the bottom of the bracket welding position.

[0011] By adopting the above technical solution, the support rod provides a stable supporting force when the bracket is under pressure, thereby avoiding deformation of the bracket when the negative pressure rod is pressed downward, thereby ensuring the quality of the finished product.

[0012] The present invention also provides a welding method using the above-mentioned equipment, and provides the following technical solutions: (1) placing the bracket to be welded on the bracket fixture, and exposing the welding position of the bracket to the outside of the bracket fixture; (2) placing the sheet solder at the welding position of the bracket; (3) placing the contact on the bracket and the solder, closing the positioning jaws, and the formed lifting channel restricts the contact to only be able to be lifted and lowered; (4) the negative pressure rod adsorbs the contact and rises, so that the contact is lifted to a certain height; (5) moving the induction coil, lifting the induction coil to the bottom of the bracket, and making the silver solder in the center area of ​​the induction coil; (6) starting the induction welding power supply, after the solder is heated to a completely molten state, the negative pressure rod presses down the contact, and gradually increases the downward pressure of the pressure rod through the extrusion spring to expel bubbles, and completes the welding; (7) the negative pressure rod stops adsorbing the negative pressure of the contact and rises, the positioning jaws unfold, the bracket fixture is released, and the finished product is taken away.

[0013] By adopting the above technical solution, the negative pressure rod absorbs the contact and then rises to form a space for sufficient heating of the solder. With the solder being in the central area of ​​the induction coil, the heating is more efficient and uniform. After being heated to a completely molten state, the negative pressure rod presses the contact down. After being pressed down to the welding position, the extrusion spring is compressed by the solder material and bubbles, and the bubbles are fully squeezed out during the subsequent recovery process until the contact and the bracket are welded. This process can ensure the contact welding quality, and the product post-welding soldering rate can reach more than 90%. At the same time, the production efficiency is improved and the welding quality consistency is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional diagram of an electrical contact assembly;

[0015] Figure 2 A three-dimensional diagram of a specific embodiment of the present invention;

[0016] Figure 3 for Figure 2 A magnified view of middle;

[0017] Figure 4 It is a bottom perspective view of a contact lifting device in a specific embodiment of the present invention;

[0018] Figure 5 It is a cross-sectional view of the negative pressure rod and the spring sleeve in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] like Figure 2 — Figure 5 As shown, the present invention discloses a high-frequency induction brazing welding device, the electric contact assembly includes a bracket a and a contact b welded to the bracket a, the bracket in this scheme is a welded copper bracket, the contact material is AgCdO, and the silver-based solder component is B Ag25CuZn, including a bracket fixture 1, an induction coil 2 and a contact lifting device 3, the bracket fixture 1 is fixed on the turntable of the automation equipment as a carrier of the bracket, and the bracket is processed in sequence, the bracket fixture 1 clamps the bracket and exposes the welding position of the bracket to the outside of the bracket fixture 1, the contact lifting device 3 is located above the bracket welding position and lifts the contact located at the bracket welding position, the induction coil 2 is located below the bracket welding position, the contact lifting device 3 first lifts the contact to a certain height, after the induction coil 2 heats the solder located at the bracket welding position to a completely molten state, the contact lifting device 3 lowers the contact to the welding height and discharges the bubbles, and lifts the contact to reserve heating space for the solder, after the solder is heated to a completely molten state, the contact is kept flat and the bubbles are discharged by pressing down, thereby ensuring the contact welding quality, the product soldering rate after welding can reach more than 90%, and at the same time, the production efficiency is improved and the welding quality consistency is good.

[0022] The contact lifting device 3 includes a pressure rod cylinder 31, a pressure rod seat 32, a negative pressure pressure rod 33 and a pressure rod guide rail 34. The negative pressure pressure rod 33 is made of epoxy resin. The pressure rod guide rail 34 is vertically arranged. The pressure rod seat 32 moves on the pressure rod guide rail 34. The pressure rod cylinder 31 drives the pressure rod seat 32 to move. The pressure rod seat 32 is provided with a spring sleeve 35 for the negative pressure pressure rod 33 to vertically pass through. A spring cavity 351 surrounding the negative pressure pressure rod 33 is provided in the spring sleeve 35. A pressure ring 331 that moves vertically in the spring cavity 351 is provided on the outer periphery of the negative pressure pressure rod 33. An extrusion spring 352 that compresses the pressure ring 331 downward is provided between the pressure ring 331 and the spring cavity 351. The lower end of the pressure rod 33 is adapted to the shape of the contact, and a negative pressure hole 332 is vertically penetrated by the negative pressure rod 33. The upper end of the negative pressure hole 332 is connected to the negative pressure source, and the lower end forms a negative pressure that absorbs the contact. The negative pressure source can be realized in various forms. In this scheme, a throttle valve 36 is used to pass 0.5MPa gas to adsorb the contact. On the one hand, the negative pressure hole 332 forms a stable, uniform and continuous negative pressure, and the shape of the lower end of the negative pressure rod 33 that is adapted to the contact makes the lifting and lowering of the contact more stable. On the other hand, during the process of pressing the contact down, the extrusion spring 352 can effectively slow down the pressing progress, thereby exhausting the bubbles and further improving the contact welding quality.

[0023] The pre-alignment device also includes an alignment jaw 4 and a jaw cylinder 41 for driving the alignment jaw 4 to open and close. When the alignment jaw 4 is closed, a lifting channel 42 for the contact is formed. The jaw cylinder 41 is provided with a lifting cylinder 43 for lifting it. The alignment jaw 4 keeps the relative position of the contact with the bracket unchanged in all directions except the vertical direction, thereby ensuring the accuracy of the alignment of the contact with the bracket during the lifting process and ensuring the quality of the finished product.

[0024] It also includes a supporting device, which includes a supporting rod 5 and a supporting cylinder 51 for driving the supporting rod 5 to rise and fall. The top end of the supporting rod 5 passes through the induction coil 2 and rests under the welding position of the bracket. The supporting rod 5 provides a stable supporting force when the bracket is under pressure, thereby avoiding deformation of the bracket when the negative pressure rod 33 is pressed downward, thereby ensuring the quality of the finished product.

[0025] The present invention also provides a welding method using the above-mentioned equipment, and provides the following technical solutions: (1) placing the bracket to be welded on the bracket fixture 1, and exposing the welding position of the bracket to the outside of the bracket fixture 1; (2) placing the sheet solder at the welding position of the bracket; (3) placing the contact on the bracket and the solder, closing the positioning jaws 4, and the formed lifting channel 42 restricts the contact to only be able to be lifted and lowered; (4) the negative pressure rod 33 adsorbs the contact and rises, so that the contact is lifted to a certain height; (5) moving the induction coil 2, lifting the induction coil 2 to the bottom of the bracket, and making the silver solder in the center area of ​​the induction coil 2; (6) starting the induction welding power supply, and after the solder is heated to a completely molten state, the negative pressure rod 33 presses down the contact, and gradually increases the pressure of the rod head by squeezing the spring 352 to expel bubbles, and completes the welding; (7) the negative pressure rod 33 stops adsorbing the contact. Negative pressure is generated and rises, the alignment jaws 4 are unfolded, the bracket clamp 1 is released, and the finished product is taken away. The negative pressure rod 33 absorbs the contact and then rises to form a space for the solder to be fully heated. The solder is in the central area of ​​the induction coil 2 to make the heating more efficient and uniform. After being heated to a completely molten state, the negative pressure rod 33 presses the contact down. After being pressed down to the welding position, the extrusion spring 352 is compressed by the solder material and the bubbles, and the bubbles are fully squeezed out during the subsequent recovery process until the contact and the bracket are welded. This process can ensure the contact welding quality, and the product post-welding brazing rate can reach more than 90%. At the same time, the production efficiency is improved and the welding quality consistency is good. In addition, the placement of the above-mentioned bracket, solder and contact is realized by the loading device of the automatic equipment, the movement of the induction coil can be realized by the existing cylinder, and the induction welding power supply is also a device possessed by the existing welding equipment, which is not described in detail.

Claims

1. A high frequency induction brazing welding device, characterized in that: It includes a bracket fixture, an induction coil and a contact lifting device, wherein the bracket fixture clamps the bracket and exposes the welding position of the bracket to the outside of the bracket fixture, the contact lifting device is located above the bracket welding position and lifts the contact located at the bracket welding position, the induction coil is located below the bracket welding position, the contact lifting device first lifts the contact to a certain height, and after the induction coil heats the solder located at the bracket welding position to a completely molten state, the contact lifting device lowers the contact to the welding height and discharges the bubbles; The contact lifting device includes a pressure rod cylinder, a pressure rod seat, a negative pressure pressure rod and a pressure rod guide rail. The pressure rod guide rail is vertically arranged, the pressure rod seat moves on the pressure rod guide rail, the pressure rod cylinder drives the pressure rod seat to move, the pressure rod seat is provided with a spring sleeve for the negative pressure pressure rod to vertically pass through, the spring sleeve is provided with a spring cavity surrounding the negative pressure pressure rod, the outer periphery of the negative pressure pressure rod is provided with a pressure ring that moves vertically in the spring cavity, an extrusion spring that squeezes the pressure ring downward is compressed between the pressure ring and the spring cavity, the lower end of the negative pressure pressure rod is adapted to the shape of the contact, the negative pressure pressure rod is vertically penetrated with a negative pressure hole, the upper end of the negative pressure hole is connected to the negative pressure source, and the lower end forms a negative pressure that sucks the contact.

2. The high frequency induction brazing welding equipment according to claim 1, characterized in that: It also includes a pre-alignment device, which includes an alignment clamping jaw and a clamping jaw cylinder for driving the alignment clamping jaw to open and close. When the alignment clamping jaw is closed, a lifting channel for the contact point is formed.

3. The high frequency induction brazing welding equipment according to claim 1, characterized in that: It also includes a supporting device, which includes a supporting rod and a supporting cylinder for driving the supporting rod to rise and fall. The top end of the supporting rod passes through the induction coil and abuts against the bottom of the bracket welding position.

4. A welding method using the high frequency induction brazing welding equipment as claimed in claim 2, characterized in that: (1) Place the bracket to be welded on the bracket fixture, and make the welding position of the bracket exposed outside the bracket fixture; (2) Place the sheet solder at the welding position of the bracket: (3) Place the contact on the bracket and the solder, close the positioning jaws, and the lifting channel formed restricts the contact to only be able to move up and down; (4) The negative pressure rod absorbs the contact and rises, so that the contact is lifted to a certain height; (5) Move the induction coil, lift the induction coil to the bottom of the bracket, and make the silver solder in the center area of ​​the induction coil; (6) Start the induction welding power supply, and after the solder is heated to a completely molten state, the negative pressure rod presses down the contact, and gradually increases the pressure of the pressure rod head by squeezing the spring to expel bubbles, completing the welding; (7) The negative pressure rod stops absorbing the negative pressure of the contact and rises, the positioning jaws unfold, release the bracket clamp, and take away the finished product.

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