CN216882160U - Welding device for plastic case circuit breaker static contact assembly - Google Patents

Abstract

The utility model relates to a welding device of a plastic case circuit breaker static contact assembly, which comprises a support seat, a ceramic pressure rod and two electrodes, wherein the support seat is used for supporting a support, an arc striking angle and a contact are tightly pressed on the support by the ceramic pressure rod, and the two electrodes are respectively propped against two sides of the support at the opposite positions of the arc striking angle and the contact. By adopting the scheme, the welding device for the fixed contact assembly of the molded case circuit breaker can complete high-quality welding procedures of three parts made of different materials, such as the bracket, the contact, the arc striking angle and the like, at one time, the welding flux of a contact assembly product overflows uniformly on the appearance, the welding brazing rate reaches more than or equal to 85 percent, and the performance indexes such as shearing force, metallographic phase and the like are good.

Description

Welding device for plastic case circuit breaker static contact assembly

Technical Field

The utility model relates to the field of processing of welding type electric contact elements, in particular to a welding device for a fixed contact assembly of a molded case circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. The circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to the application range, the high-voltage and low-voltage boundary lines are relatively vague, and the circuit breakers above 3kV are generally called high-voltage electric appliances.

The circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur, and the function of the circuit breaker is equivalent to the combination of a fuse type switch, an over-under-heat relay and the like. Furthermore, no parts need to be changed after breaking the fault current. Has been widely used.

As shown in fig. 1, the contact assembly is used as an electrical contact component of an inner core of a molded case circuit breaker, and includes a bracket a, an arc striking angle b welded to the bracket a, and a contact c, where notches a1 are formed on two sides of the bracket a, and the welding quality largely determines the service life of the switch, so that the welding quality of the contact assembly is particularly important, and when a fixed contact assembly of a special structure of this type is welded, an induction brazing process or a resistance brazing process is generally used.

If induction brazing is adopted, the process has the characteristic of welding a plurality of parts at one time, when a contact and an arc striking angle are heated simultaneously, because the arc striking angle is made of iron plated copper and made of silver graphite, the arc striking angle is firstly heated to a red state, and when a material to be welded reaches a completely molten state, the arc striking angle can generate an overburning problem to influence the welding appearance and the electroplating quality of a product.

If the traditional metal electrode direct resistance brazing process is adopted, the welding of a support and a contact is required to be completed firstly, generally, in order to ensure the welding strength of a product, obvious welding flux overflows around a static contact after welding, and when an arc striking angle is welded again under the condition, a certain assembly gap is inevitably generated between the arc striking angle and the contact. Meanwhile, the direct resistance brazing process adopts an upper electrode structure and a lower electrode structure, the specific mode is that the upper electrode presses a contact point or the upper surface of an iron copper plating arc striking angle, the lower electrode needs to be inserted into a U-shaped structure of a bracket to play the functions of supporting a component and transmitting current and pressure, welding heat can be concentrated on an interface where the electrode is contacted with a part when the welding process is adopted, due to the action of larger heat and pressure, the contact point and the arc striking angle need to be welded step by step, and due to the close proximity of the contact point and the arc striking angle, the former welding procedure can influence the later procedure, in addition, the lower electrode is a cantilever beam type overhanging structure, in terms of a mechanical structure, in the product welding process, a moment is equivalently acted on the electrode, under the action of welding pressure, the position of the lower electrode extending out of an electrode base can be bent or even broken, and the service life of the lower electrode is shorter when the process is welded, the welding efficiency is low, the production cost is high, and the mass production and the control of economic benefits are not facilitated.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a welding device for a fixed contact assembly of a molded case circuit breaker, which can finish the high-quality welding process of three parts made of different materials, such as a bracket, a contact, an arc striking angle and the like, at one time, the welding flux of a contact assembly product overflows uniformly on the appearance, the welding brazing rate reaches more than or equal to 85 percent, and the performance indexes of shearing force, metallographic phase and the like are good.

In order to achieve the purpose, the utility model provides the following technical scheme: the device comprises a support supporting seat, a ceramic pressing rod and two electrodes, wherein the support supporting seat is used for supporting a support, the ceramic pressing rod presses an arc striking angle and a contact on the support, and the two electrodes respectively abut against two sides of the support at opposite positions of the arc striking angle and the contact.

By adopting the technical scheme, the electrode structure is composed of two electrodes which are designed into a bilateral symmetry structure and are propped against a bracket in a traditional electric conduction mode of a vertical structure of an upper electrode and a lower electrode, an arc striking angle and a contact are tightly pressed on the bracket by a ceramic pressure rod, an indirect resistance brazing welding process is realized, the contact and the arc striking angle are assembled when welding, the welding work of parts made of three different materials, such as the bracket, the contact and an iron copper plating arc striking angle, can be finished at one time, because the arc striking angle and the contact are not heated by great welding pressure and welding current, the working surfaces of the contact and the arc striking angle are almost not damaged, because the contact and the arc striking angle are welded simultaneously, no obvious welding gap exists between the contact and the arc striking angle, the welding flux on the periphery of the contact and the arc striking angle after welding of a product overflow uniformly, the welding brazing rate, the metallographic phase, the shearing force and other strength performance indexes are good, and the welding quality consistency of the product is good, the welding efficiency is high, and the mass stable production of products can be realized.

The utility model is further configured to: the support supporting seat be provided with place the platform and spacing ejector pad, place the platform both be provided with spacing boss spacing in support both sides breach respectively, spacing ejector pad be provided with and supply support tip male spacing groove, support supporting seat and spacing ejector pad between be provided with the spacing spring with spacing ejector pad to support propelling movement.

Through adopting above-mentioned technical scheme, form the stable spacing cooperation of support for the support supporting seat by spacing boss and spacing ejector pad cooperation to guarantee the welding quality of support, in addition, the welding demand of the quiet contact subassembly of different specifications can be realized to adjustment spacing boss and spacing ejector pad specification.

The utility model is further configured to: the ceramic press rod lifting device comprises a positioning clamp, a positioning clamp opening and closing cylinder and a positioning clamp moving cylinder, a clamping cavity matched with an arc striking angle and a contact shape is formed when the positioning clamp is closed, the positioning clamp opening and closing cylinder drives the positioning clamp to open or close, and the positioning clamp moving cylinder drives the positioning clamp to move above and outside the support.

Through adopting above-mentioned technical scheme, add the assembly aligning device for place the run-on angle and contact accuracy on the support, and compress tightly run-on angle and contact by the ceramic depression bar before the locating clip is opened, stably keep the mounted position and last the keeping in welding process, thereby guarantee the welding effect, in addition, the welding demand of different specification stationary contact subassemblies can be realized to centre gripping chamber shape.

The utility model is further configured to: the support supporting seat is positioned below the support and is provided with a cooling hole in a penetrating way.

Through adopting above-mentioned technical scheme, for the ease that the support supporting seat can dispel the heat fast, run through in the support below (being close to welding position promptly) and set up the cooling hole, increase the heat radiating area of support supporting seat, improve cooling efficiency.

The utility model is further configured to: and a cooling cavity and a medium circulating pipeline for exchanging a cooling medium in the cooling cavity with the outside are arranged in the part of the support seat far away from the support.

Through adopting above-mentioned technical scheme, add the cooling chamber to continuously exchange cooling medium and external world by medium circulating line, thereby optimize the cooling performance of support supporting seat, provide good heat dissipation basis for the welding of continuation.

The utility model is further configured to: and each electrode is provided with an electrode seat for fixing the electrode, and each electrode seat is provided with a cooling air pipe for cooling the electrode.

Through adopting above-mentioned technical scheme, when the welding was accomplished, the cooling air pipe can blow out a large amount of air, carries out rapid cooling to the electrode, extension electrode life.

The utility model is further configured to: each electrode is respectively provided with an electrode holder for fixing the electrode, wherein one electrode holder is provided with an electrode cylinder for driving the electrode holder to approach or depart from the other electrode holder.

By adopting the technical scheme, one electrode is used as a fixed electrode, and the other electrode is used as a movable electrode and moves under the driving of the electrode cylinder, so that the driving structure is simplified.

The utility model is further configured to: the support is characterized in that a support base is arranged below the support supporting seat, the support base is provided with a base track and a base cylinder, and the base cylinder drives the support supporting seat to move on the base track, so that the support supporting seat is positioned between the two electrodes or positioned outside the two electrodes.

Through adopting above-mentioned technical scheme, base cylinder drive support supporting seat removes and makes it can be located outside two electrodes before the welding, provides sufficient support assembly space, and the manual work/machine assembly of being convenient for carries out the rapid Assembly support.

The utility model is further configured to: the support base both sides be provided with the positioning board respectively, both sides the positioning board between be provided with the guide arm that supplies the support base to slide, the guide arm be located the support base and be provided with positioning spring respectively.

Through adopting above-mentioned technical scheme, mobilizable support base makes support assembly seat have the position compensation function, and the support that is located the support supporting seat of primary importance can follow movable electrode synchronous motion after receiving movable electrode extrusion promptly, until eliminating the clearance between motionless electrode and the support to guarantee that two electrodes closely cooperate with the support, guarantee the welding effect, the support supporting seat after the positioning can stably keep with positioning spring cooperation messenger's positioning board.

The utility model is further configured to: each electrode be provided with the electrode holder of fixed electrode respectively, each electrode holder be provided with the mounting groove of installation electrode respectively, the lateral wall of electrode groove one side constitute by the locking piece that the cross-section is right trapezoid, the electrode holder be provided with the cooperation of sliding of the trapezoidal hypotenuse place terminal surface of locking piece to the guiding slope face of electrode is compressed tightly gradually to the trapezoidal hypotenuse place terminal surface of locking piece when sliding, electrode holder and locking piece between be provided with the locking bolt of fixing both behind the clamp electrode.

By adopting the technical scheme, the end face of the trapezoidal right-angle side of the locking block gradually approaches to the electrode in a manner of being parallel to the side face of the electrode when the locking block slides along the guide slope surface until the locking block is locked by the locking bolt after being clamped, so that the electrode is more convenient to replace; on the other hand, the locking reliability of the electrode is made better.

Drawings

Fig. 1 is a perspective view of a molded case circuit breaker stationary contact assembly;

FIG. 2 is a perspective view of an embodiment of the present invention;

FIG. 3 is a perspective view of a bracket support and bracket base according to an embodiment of the present invention;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is an enlarged view of B in FIG. 3;

FIG. 6 is a perspective view of a mating alignment device in accordance with an embodiment of the present invention;

fig. 7 is an enlarged view of C in fig. 2.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 2-7, the utility model discloses a welding device of a fixed contact assembly of a molded case circuit breaker, which comprises a support seat 1, a ceramic press rod 2 and two electrodes 3, wherein the support seat 1 is used for supporting a support, the ceramic press rod 2 presses an arc striking angle and a contact to the support, the two electrodes 3 respectively support against two sides of the support at the position opposite to the arc striking angle and the contact, the electrode 3 is structurally composed of two electrodes 3 which are designed into a left-right symmetrical structure and are pressed against the support in a traditional conductive mode of a vertical structure of an upper electrode 3 and a lower electrode 3, the arc striking angle and the contact are pressed to the support by the ceramic press rod 2, an indirect resistance brazing welding process is realized, when in welding, the contact and the arc striking angle are assembled, the welding work of three parts made of different materials such as the support, the contact and an iron copper-plated arc striking angle can be finished at one time, and the arc striking angle and the contact are not heated by great welding pressure and welding current, therefore, the working surfaces of the contact and the arc striking angle are almost free of damage, no obvious welding gap exists between the contact and the arc striking angle due to the fact that the contact and the arc striking angle are welded simultaneously, the arc striking angle and welding flux around the contact of a product after welding overflow evenly, the strength performance indexes such as welding brazing rate, metallographic phase and shearing force are good, the product welding quality consistency is good, the welding efficiency is high, and mass stable production of the product can be achieved.

Support supporting seat 1 is provided with place the platform 11 and spacing ejector pad 12, place the platform 11 both are provided with spacing boss 111 spacing in support both sides breach respectively, spacing ejector pad 12 is provided with and supplies support tip male spacing groove 121, be provided with spacing spring 122 with spacing ejector pad 12 to the support propelling movement between support supporting seat 1 and the spacing ejector pad 12, form the support by spacing boss 111 and the cooperation of spacing ejector pad 12 and for the stable spacing cooperation of support supporting seat 1, thereby guarantee the welding quality of support, in addition, the welding demand of different specification static contact subassemblies can be realized to spacing boss 111 of adjustment and the 12 specifications of spacing ejector pad.

The ceramic press rod assembly positioning device comprises a positioning clamp 41, a positioning clamp opening and closing cylinder 42 and a positioning clamp moving cylinder 43, a clamping cavity 411 matched with an arc striking angle and a contact shape is formed when the positioning clamp 41 is closed, the positioning clamp opening and closing cylinder 42 drives the positioning clamp 41 to open or close, the positioning clamp moving cylinder 43 drives the positioning clamp 41 to move above and outside a support, the assembly positioning device 4 is additionally arranged and used for accurately placing the arc striking angle and the contact on the support, the arc striking angle and the contact are tightly pressed by the ceramic press rod 2 before the positioning clamp 41 is opened, the assembly position is stably kept and continuously kept in the welding process, the welding effect is guaranteed, and in addition, the welding requirements of static contact assemblies of different specifications can be met by the shape of the clamping cavity 411.

Support supporting seat 1 is located the support below and runs through and is provided with cooling hole 13, for the ease that support supporting seat 1 can dispel the heat fast, runs through in the support below (be close to the welding position promptly) and sets up cooling hole 13, increases support supporting seat 1's heat radiating area, improves cooling efficiency. The part of the support supporting seat 1 below the support is made of stainless steel so as to provide good rigid support for the support.

Be provided with the cooling chamber in the part that support supporting seat 1 kept away from the support and be used for carrying out the medium circulating line 14 that exchanges with the cooling medium in the cooling chamber with the external world, add the cooling chamber to continuously exchange cooling medium and external world by medium circulating line 14, thereby optimize support supporting seat 1's cooling performance, provide good heat dissipation basis for the welding of continuation. The material of the partial bracket supporting seat 1 is chromium zirconium copper material with good heat conductivity.

Each electrode 3 is provided with the electrode holder 31 of fixed electrode 3 respectively, and each electrode holder 31 is provided with the cooling tuber pipe 32 that carries out the cooling to electrode 3 respectively, and when the welding was accomplished, cooling tuber pipe 32 can blow off a large amount of air, carries out rapid cooling to electrode 3, extension electrode 3 life.

Each electrode 3 is provided with an electrode holder 31 for fixing the electrode 3, one electrode holder 31 is provided with an electrode cylinder 33 for driving the electrode holder 31 to approach or separate from the other electrode holder 31, one electrode 3 is a fixed electrode 3, and the other electrode 3 is a movable electrode 3 and moves by the driving of the electrode cylinder 33, thereby simplifying the driving structure.

Support supporting seat 1 below is provided with support base 5, support base 5 is provided with base track 51 and base cylinder 52, and base cylinder 52 drive support supporting seat 1 moves in base track 51, makes support supporting seat 1 be located between two electrodes 3 or be located outside two electrodes 3, and base cylinder 52 drive support supporting seat 1 moves and makes it can be in before the welding outside two electrodes 3, provides sufficient support assembly space, and the manual work of being convenient for/machine assembly carries out the rapid Assembly support.

The both sides of support base 5 are provided with positioning plate 53 respectively, be provided with the guide arm 54 that supplies support base 5 to slide between the positioning plate 5 of both sides, guide arm 54 is located support base 5 and is provided with positioning spring 55 respectively, mobilizable support base 5 makes support assembly seat have the position compensation function, the support of support supporting seat 1 who is located the first position receives movable electrode 3 extrusion back can be along with movable electrode 3 synchronous motion promptly, until eliminating the clearance between motionless electrode 3 and the support, thereby guarantee two electrode 3 and support and closely cooperate, guarantee the welding effect, positioning plate 53 and positioning spring 54 cooperate and make support supporting seat 1 after the positioning stably keep.

Each electrode 3 is respectively provided with an electrode seat 31 for fixing the electrode 3, each electrode seat 31 is respectively provided with a mounting groove 34 for mounting the electrode 3, the side wall of one side of the electrode 3 groove is composed of a locking block 35 with a right trapezoid cross section, the electrode seat 31 is provided with a locking bolt 37 which is in sliding fit with the end surface of the trapezoid inclined edge of the locking block 35, the end surface of the trapezoid inclined edge of the locking block 35 gradually compresses the guiding slope 36 of the electrode 3 when sliding, the locking bolt 37 for fixing the electrode 3 after clamping the electrode 3 is arranged between the electrode seat 31 and the locking block 35, the end surface of the trapezoid right angle edge of the locking block 35 when sliding along the guiding slope 36 is gradually close to the electrode 3 in a manner parallel to the side surface of the electrode 3 until being locked by the locking bolt after clamping, on one hand, the replacement of the electrode 3 is more convenient; on the other hand, the locking reliability of the electrode 3 is made better.

When welding is needed, (1) solder preparation is carried out, the welding surface of the contact is pre-coated with solder with the same size as the length and width of the contact, the material is BAg15CuP, and cream solder made of BAg15CuP is added in the copper plating arc striking angle area of the bracket welding iron.

(2) The support positioning, the support to be welded is placed in the support supporting seat 1, the tail of the support is clamped into the limiting groove 121 of the support supporting seat 1, the side surface of the support is limited by the limiting boss 111, and the support can be limited on the support supporting seat 1;

(3) moving the support, starting the base cylinder 52, enabling the base cylinder 52 to drive the support seat 1 to move on the base track 51, and enabling the support seat 1 to move to a welding position between the two electrodes 3 from the outside of the two electrodes 3; starting the motor cylinder 33, moving the electrode seat 31 on the right side to the left until the left and right electrodes 3 clamp the support, wherein in the process, the support base 5 is provided with a positioning spring, so that the support seat 1 can move left and right and stably maintain the position;

(4) assembling and positioning a contact and an iron copper plating arc striking angle, and specifically comprises the following steps:

(a) starting a positioning clamp moving cylinder 43 to move the positioning clamp 41 to the upper part of the bracket, starting a positioning clamp opening and closing cylinder 42, and enabling the positioning clamp to approach to the positions of a contact and an arc striking angle on the bracket until a set stroke is reached, wherein the step is to perform initial positioning on the contact and the arc striking angle;

(b) placing a contact at the position of a bracket welding contact, and placing an iron copper plating arc striking angle at the position of an iron copper plating arc striking angle on the bracket;

(c) the positioning clamp opening and closing cylinder 42 is started again, the positioning clamp is closed, the contact and the iron copper plating arc striking angle are clamped, the contact and the iron copper plating arc striking angle are completely positioned left, right, front and back,

(d) starting the pressure rod cylinder 21 to enable the ceramic pressure rod 2 to move downwards until the contact and the arc striking angle are attached tightly, and starting the positioning clamp opening and closing cylinder 42 again to separate the positioning clamp;

(e) starting the positioning clamp moving cylinder 43, and retreating the positioning clamp 41;

(5) welding of products

After all the steps are completed, namely all preparation work before welding is completed, a welding power supply of the resistance welding equipment is started, and the workpiece is electrified and heated under the set welding current and welding time parameters, so that the welding of the contact assembly is finally completed.

(6) Product discharge

And starting the pressure rod cylinder 21 to enable the ceramic pressure rod 2 to move upwards, starting the base cylinder 52 to enable the support seat 1 to move to a material taking position outside the two electrodes 3 from between the two electrodes 3, taking away a finished product, and timely cooling the electrode 3 and the support seat 1 after taking away the finished product.

Claims (10)

1. The utility model provides a welding set of moulded case circuit breaker fixed contact subassembly which characterized in that: the device comprises a support supporting seat, a ceramic pressure rod and two electrodes, wherein the support supporting seat is used for supporting a support, the ceramic pressure rod tightly presses an arc striking angle and a contact on the support, and the two electrodes respectively support against two sides of the support, which are opposite to the arc striking angle and the contact.

2. The welding device of the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: the support supporting seat be provided with place the platform and spacing ejector pad, place the platform both sides be provided with respectively in the spacing boss of support both sides breach, spacing ejector pad be provided with and supply support tip male spacing groove, support supporting seat and spacing ejector pad between be provided with the spacing spring with spacing ejector pad to support propelling movement.

3. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: the ceramic press rod lifting device comprises a positioning clamp, a positioning clamp opening and closing cylinder and a positioning clamp moving cylinder, a clamping cavity matched with an arc striking angle and a contact shape is formed when the positioning clamp is closed, the positioning clamp opening and closing cylinder drives the positioning clamp to be opened or closed, and the positioning clamp moving cylinder drives the positioning clamp to move above and outside the support.

4. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: the support supporting seat is positioned below the support and is provided with a cooling hole in a penetrating way.

5. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: and a cooling cavity and a medium circulating pipeline for exchanging a cooling medium in the cooling cavity with the outside are arranged in the part of the support seat far away from the support.

6. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: and each electrode is provided with an electrode seat for fixing the electrode, and each electrode seat is provided with a cooling air pipe for cooling the electrode.

7. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: each electrode is respectively provided with an electrode holder for fixing the electrode, wherein one electrode holder is provided with an electrode cylinder for driving the electrode holder to approach or depart from the other electrode holder.

8. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 7, wherein: the support is characterized in that a support base is arranged below the support supporting seat, the support base is provided with a base track and a base cylinder, and the base cylinder drives the support supporting seat to move on the base track, so that the support supporting seat is positioned between the two electrodes or positioned outside the two electrodes.

9. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 8, wherein: the support base both sides be provided with the positioning board respectively, both sides the positioning board between be provided with the guide arm that supplies the support base to slide, the guide arm be located support base both sides, be provided with positioning spring respectively.

10. The welding device for the fixed contact assembly of the molded case circuit breaker according to claim 1, wherein: each the electrode be provided with fixed electrode's electrode holder respectively, each the electrode holder be provided with the mounting groove of installation electrode respectively, the lateral wall of mounting groove one side constitute by the locking block that the cross-section is right trapezoid, the trapezoidal hypotenuse place terminal surface of electrode holder and locking block slide the cooperation to the trapezoidal right angle place terminal surface of locking block compresses tightly the guide domatic of electrode gradually when sliding, electrode holder and locking block between be provided with behind the clamping electrode with both fixed locking bolt.

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