Automatic spot welding machine for brush holder components

Abstract

The present invention and an automatic spot welding machine for a brush holder assembly are mainly composed of a machine body and a spot welding control host. A processing table, a capacitor spot welding assembly, a brush spot welding assembly and a negative spot welding assembly are provided on the machine body, wherein the tooling seat on the processing table is used to carry the brush holder assembly to be welded. The negative welding head of the negative spot welding assembly is connected to the negative pole of the spot welding control host, and during operation, it presses down the brush holder assembly to be welded and contacts a pair of plug-ins; the capacitor spot welding assembly and the brush spot welding assembly are both provided with a positive welding head connected to the positive pole of the spot welding control host. During the welding process, the positive welding head of the capacitor spot welding assembly cooperates with the negative welding head to realize spot welding of the capacitor pin and the plug-in in the brush holder assembly; the positive welding head of the brush spot welding assembly cooperates with the negative welding head to complete spot welding of the brush wire and the plug-in. Through the coordinated work of the positive and negative welding heads, efficient and precise spot welding of the various components of the brush holder assembly is realized.

Description

Technical Field

[0001] The invention relates to the technical field of fuel pump assembly, in particular to an automatic spot welding machine for a brush holder assembly. Background Art

[0002] In the assembly process of the fuel pump, the key steps include pre-installing the two brushes and capacitor on the brush holder to form a brush holder assembly to be welded, and respectively welding the two brush wires to the positive and negative plugs of the brush holder, and respectively welding the two pins of the capacitor to the positive and negative plugs, thus forming the finished brush holder assembly.

[0003] The spot welding process for brush holder assemblies in traditional fuel pumps relies primarily on manual labor. During this process, a worker uses both hands to support the brush holder assembly to be welded, carefully aligns it, and then places it on the welding machine. The worker then presses the machine to complete one weld. After completing this weld, the assembly is removed and re-aligned before proceeding to the next weld. This process involves welding one weld at a time, and after four spot welding passes, the brush holder assembly is complete. For example, when welding a brush, one brush wire has one weld point with the positive tab, and another with the negative tab. For example, when welding a capacitor, one pin has one weld point with the positive tab, and another with the negative tab. After spot welding, the worker manually trims the excess wire from the capacitor using scissors. This is the portion of the pin that extends beyond the weld after connecting to the tab. This portion no longer contributes to the electrical connection and affects the product's appearance. This traditional process has significant drawbacks. First, the efficiency is low, the operation process is cumbersome and time-consuming, which seriously restricts the production progress; second, the welding quality is unstable. Since the welding time and pressure are difficult to be consistent when different workers operate, the welding quality depends to a large extent on the workers' proficiency; third, there are safety risks. The high temperature generated by the welding point during welding can easily burn workers and threaten personal safety. Summary of the Invention

[0004] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides an automatic spot welding machine for a brush holder assembly, which can achieve rapid welding, greatly improve the consistency of welding quality, and effectively avoid the problem of employees being burned by high temperature when holding spot welding.

[0005] The technical solution of the present invention is: a brush holder assembly automatic spot welding machine, comprising a machine body and a spot welding control host, wherein the machine body is provided with a processing table, a capacitor spot welding assembly, a brush spot welding assembly and a negative electrode spot welding assembly;

[0006] A tooling seat is provided on the processing table, and the tooling seat is used to carry the brush holder assembly to be welded;

[0007] The negative electrode welding head of the negative electrode spot welding assembly is connected to the negative electrode of the spot welding control host, and the negative electrode welding head is used to press down the brush holder assembly to be welded on the tooling seat and contact with a pair of inserts;

[0008] The capacitor spot welding assembly and the brush spot welding assembly are both provided with a positive welding head, which is connected to the positive pole of the spot welding control host. The positive welding head and the negative welding head of the capacitor spot welding assembly cooperate to spot weld the pins of the capacitor in the brush holder assembly to be welded to the corresponding plug-in; the positive welding head and the negative welding head of the brush spot welding assembly cooperate to spot weld the brush wires and the plug-in in the brush holder assembly to be welded to the corresponding plug-in.

[0009] By adopting the above technical solution, two brushes and a capacitor are pre-installed on the brush holder to form a brush holder assembly to be welded. The brush holder assembly to be welded is placed on the workbench, and then the spot welder is started, and spot welding is automatically performed according to the set program. First, the negative welding head of the negative spot welding assembly presses down on the brush holder assembly to be welded on the workbench and contacts a pair of plugs. → The positive and negative welding heads of the brush spot welding assembly cooperate to spot weld the brush wires in the brush holder assembly to be welded to the corresponding plugs. → The positive and negative welding heads of the capacitor spot welding assembly cooperate to spot weld the pins of the capacitor in the brush holder assembly to be welded to the corresponding plugs. The spot welding control host can control the spot welding current, spot welding pressure, and spot welding time, ensuring stable welding quality, high efficiency, and energy saving.

[0010] This equipment significantly improves welding efficiency and achieves highly consistent welding quality. It eliminates the need for handheld brush holders, which can cause burns to employees. Each component can be independently powered on and off, and features an anomaly monitor for quick and accurate troubleshooting.

[0011] The present invention is further provided with: two groups of the capacitor spot welding assembly and the brush spot welding assembly are each provided and distributed on the periphery of the tooling seat; each group of the capacitor spot welding assembly and the brush spot welding assembly is provided with a first drive execution unit, and the first drive execution unit is used to drive the positive electrode welding head to slide horizontally to approach or move away from the brush holder assembly to be welded in the middle; the negative electrode spot welding assembly is provided with a second drive execution unit, and the second drive execution unit is used to drive the negative electrode welding head to slide up and down to approach or move away from the brush holder assembly to be welded below.

[0012] With this further configuration, the negative electrode welding head can stably contact a pair of inserts through the lifting and sliding of the second drive execution unit. The positive electrode welding head can accurately align with the capacitor pins or brush wires in the brush holder assembly to be welded through the horizontal sliding of the first drive execution unit, ensuring the accuracy of the spot welding position. One set of capacitor spot welding assemblies is used to spot weld one pin of the capacitor to the negative insert, and the other set of capacitor spot welding assemblies is used to spot weld the other pin of the capacitor to the positive insert. One set of brush spot welding assemblies is used to spot weld one brush wire to the negative insert, and the other set of brush spot welding assemblies is used to spot weld the other brush wire to the positive insert.

[0013] The present invention is further provided with: the welding head is made of tungsten-copper alloy material.

[0014] With the aforementioned further configuration, the tungsten-copper alloy possesses excellent electrical and thermal conductivity, as well as hardness, making it resistant to high temperatures and arc erosion, ensuring stable weld quality and a long service life during prolonged spot welding operations. This alloy material selection enables the welding head to quickly conduct current and generate the required welding heat when contacting the brush holder assembly to be welded, while maintaining excellent wear resistance and deformation resistance, ensuring the strength and reliability of the weld joint. Furthermore, the tungsten-copper alloy exhibits excellent corrosion resistance, maintaining the welding head's surface quality and welding performance in a variety of environments, further enhancing the equipment's applicability and durability.

[0015] The present invention is further provided with: a wire cutting assembly is provided on the machine body, which includes an automatic shear; the automatic shear is located above the tooling seat and is used for automatically cutting excess pin wire ends on the capacitor.

[0016] With the above-mentioned further settings, the automatic shears can accurately locate and cut the excess pin wires on the capacitor without manual operation, greatly improving production efficiency and automation level.

[0017] The present invention is further configured as follows: the wire cutting assembly also includes a third drive execution unit and a fourth drive execution unit, the third drive execution unit is used to drive the automatic shears to move up and down, and the fourth drive execution unit is used to drive the automatic shears to slide horizontally to the corresponding positions of the two pins of the capacitor to achieve staged cutting.

[0018] With the above-mentioned further setting, the precise driving of the fourth driving execution unit enables the automatic clippers to be accurately moved above the corresponding positions of the two pins of the capacitor, and cooperates with the third driving execution unit to drive the automatic clippers to descend, so as to achieve phased and precise cutting of the two pins of the capacitor.

[0019] The present invention is further configured as follows: the processing table is divided into a spot welding station and a wire trimming station; the capacitor spot welding assembly, the brush spot welding assembly and the negative electrode spot welding assembly are arranged at the spot welding station, and the wire trimming assembly is arranged at the wire trimming station; a fifth drive execution unit is provided on the machine body, which is used to drive the tooling seat to slide horizontally between the spot welding station and the wire trimming station.

[0020] With this further configuration, the tooling base can flexibly switch between the spot welding and wire trimming stations, achieving automation and continuity in the brush holder assembly processing process. In the spot welding station, the capacitor spot welding assembly, brush spot welding assembly, and cathode spot welding assembly work together to efficiently complete the brush holder assembly spot welding operation. Once spot welding is complete, the fifth drive execution unit drives the tooling base to slide rapidly to the wire trimming station, where the wire trimming assembly then begins cutting the lead wires.

[0021] The present invention is further configured as follows: a material return assembly is provided on the machine body, and the material return assembly includes a material return shaft and a sixth drive execution unit; the tooling seat is provided with a through hole passing through the upper and lower ends, and the material return shaft is movably arranged in the through hole, and the sixth drive execution unit is used to drive the material return shaft to move upward to eject the brush holder assembly that has been completed welding on the tooling seat.

[0022] With this further configuration, once the brush holder assembly completes the capacitor pin shearing operation at the trimming station, the stripper assembly comes into play. The sixth drive execution unit activates, driving the stripper shaft upward along the through-hole. This action ejects the welded brush holder assembly from the workholding, allowing the operator or subsequent automated equipment to remove the finished assembly, freeing up space for the next brush holder assembly in the processing flow.

[0023] The present invention is further provided with: the sixth drive execution unit of the material return assembly is located below the processing table, the material return shaft is arranged on the work seat, and is a split structure with the output shaft of the sixth drive execution unit; a through opening is opened on the processing table, which is located between the output shaft of the sixth drive execution unit and the material return shaft; the output shaft of the sixth drive execution unit extends upward and abuts against the material return shaft on the work seat, and is separated from the material return shaft after retracting; the material return assembly also includes an elastic reset part, which is arranged between the work seat and the material return shaft, and is used to provide a driving force for the material return shaft to reset downward.

[0024] This further arrangement allows the sixth drive actuator to be cleverly positioned below the machining table, saving space above the table and making the entire machine more compact. The material removal shaft, mounted on the workholding, forms a separate structure from the output shaft of the sixth drive actuator. This design allows the two to work together efficiently during operation, yet remain separate when not in operation, avoiding unnecessary energy consumption and wear.

[0025] A specially designed opening in the workbench ensures that the stripper shaft can be accurately and quickly lifted by the output shaft of the sixth drive actuator. When the output shaft of the sixth drive actuator extends upward, it tightly contacts the stripper shaft on the workbench, pushing the stripper shaft upward and completing the stripping operation. When the output shaft retracts, it separates from the stripper shaft, preparing for the next stripping operation.

[0026] In addition, the stripper assembly includes an elastic return element, which is cleverly positioned between the tooling base and the stripper shaft. This elastic return element provides a continuous downward driving force for the stripper shaft, ensuring that the stripper shaft can quickly and accurately return to its initial position after completing the stripping action, fully preparing for the next stripping action.

[0027] The present invention is further provided with a plug-in slot and a positioning structure on the tooling seat, wherein the plug-in slot is used for inserting the tail of the brush holder, and the positioning structure is used for positioning the tail of the brush holder inserted into the plug-in slot.

[0028] The above-mentioned further configuration, with the insertion slot, allows the brush holder tail to be inserted easily and quickly without complicated adjustment and fixing steps. The positioning structure ensures that the brush holder tail is firmly positioned after insertion into the insertion slot, avoiding possible shaking or shifting during operation, thereby ensuring the accuracy and quality of welding.

[0029] The present invention is further provided with: the positioning structure is a ball plunger structure, the ball head of which can move in and out of the plug-in slot, and the compression spring in the ball plunger presses the ball head against the outer periphery of the tail of the brush holder to achieve positioning.

[0030] With the above-mentioned further configuration, the ball plunger structure is not only simple and compact, but also effectively positions the rear end of the brush holder. The mobility of the ball allows it to flexibly enter and exit the slot, while the elastic force of the compression spring ensures that the ball fits tightly against the outer periphery of the rear end of the brush holder, achieving a stable positioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural diagram of a specific embodiment of the present invention;

[0032] Figure 2 This is a structural diagram of two groups of capacitor spot welding components 3 and brush spot welding components 4 in a specific embodiment of the present invention;

[0033] Figure 3 This is a structural diagram of one set of capacitor spot welding components 3 or brush spot welding components 4 in a specific embodiment of the present invention;

[0034] Figure 4 This is a structural diagram of a negative electrode spot welding assembly and a material stripping assembly in a specific embodiment of the present invention;

[0035] Figure 5 This is a structural diagram of a material stripping assembly in a specific embodiment of the present invention;

[0036] Figure 6 This is a structural diagram of a thread trimming assembly in a specific embodiment of the present invention;

[0037] Figure 7 This is a structural diagram of a thread trimming assembly in a specific embodiment of the present invention;

[0038] Figure 8 This is a structural diagram of a processing platform in a specific embodiment of the present invention;

[0039] Figure 9A structural diagram of a positioning structure in a specific embodiment of the present invention;

[0040] Figure 10 This is a structural diagram of a brush holder assembly in a specific embodiment of the present invention;

[0041] Figure 11 This is a structural diagram of the brush holder assembly in a specific embodiment of the present invention.

[0042] In the figure: body 1, processing table 2, capacitor spot welding assembly 3, brush spot welding assembly 4, positive welding head 31, first drive execution unit 32, negative spot welding assembly 5, negative welding head 51, second drive execution unit 52, tooling seat 6, through hole 61, plug slot 62, positioning structure 63, ball head 631, compression spring 632, thread trimming assembly 7, automatic shears 71, third drive execution unit 72, fourth drive execution unit 73, fifth drive execution unit 11, material stripping assembly 8, material stripping shaft 81, sixth drive execution unit 82, output shaft 821, elastic reset member 83, guide rail 64, guide rod 74, control panel 10, negative connection cable 20, positive connection cable 30;

[0043] Brush holder assembly 50 , brush holder 501 , positive electrode plug 5011 , negative electrode plug 5012 , brush 502 , capacitor 503 , capacitor welding point 504 , brush welding point 505 . DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] like Figure 1-9 As shown, an automatic spot welding machine for a brush holder assembly of the present invention comprises a machine body 1 and a spot welding control host, wherein the machine body 1 is provided with a processing table 2, a capacitor spot welding assembly 3, a brush spot welding assembly 4 and a cathode spot welding assembly 5, wherein the spot welding control host is not shown in the figure, and mainly adopts advanced PLC control technology, has the advantages of high degree of automation and high control accuracy, and can realize the coordinated operation of the capacitor spot welding assembly 3, the brush spot welding assembly 4 and the cathode spot welding assembly 5, thereby improving production efficiency and quality;

[0046] A tooling seat 6 is provided on the processing table 2, and the tooling seat 6 is used to carry the brush holder assembly to be welded;

[0047] The negative electrode welding head 51 of the negative electrode spot welding assembly 5 is connected to the negative electrode of the spot welding control host through the negative electrode connecting cable 20. The negative electrode welding head 51 is used to press down the brush holder assembly to be welded on the tooling seat 6 and contact with a pair of inserts;

[0048] The capacitor spot welding assembly 3 and the brush spot welding assembly 4 are both provided with a positive welding head 31, which is connected to the positive pole of the spot welding control host through a positive connecting cable 30. The positive welding head 31 of the capacitor spot welding assembly 3 cooperates with the negative welding head 51 to spot weld the pins of the capacitor in the brush holder assembly to be welded to the corresponding plug-in; the positive welding head 31 and the negative welding head 51 of the brush spot welding assembly 4 cooperate to spot weld the brush wires in the brush holder assembly to be welded to the corresponding plug-in. The capacitor spot welding assembly 3 and the brush spot welding assembly 4 are each provided with two groups and distributed on the periphery of the tooling seat 6. Each group of capacitor spot welding assembly 3 and brush spot welding assembly 4 is provided with a first drive execution unit 32, and the first drive execution unit 32 is used to drive the positive electrode welding head 31 to slide horizontally to approach or move away from the brush holder assembly to be welded in the middle; the negative electrode spot welding assembly 5 is provided with a second drive execution unit 52, and the second drive execution unit 52 is used to drive the negative electrode welding head 51 to slide up and down to approach or move away from the brush holder assembly to be welded below. The welding head is made of tungsten-copper alloy. Each group of capacitor spot welding assembly 3 and brush spot welding assembly 4 can be spot welded at the same time or in sequence. Of course, only one group of capacitor spot welding assembly 3 and brush spot welding assembly 4 can also be provided. For example, one group of capacitor spot welding assembly 3 can spot weld the two pins of the capacitor in sequence, and one group of capacitor spot welding assembly 3 first spot welds the first pin, then moves to the corresponding second pin position and performs spot welding.

[0049] The body 1 is provided with a wire cutting assembly 7, which includes an automatic shear 71; the automatic shear 71 is located above the tooling seat 6 and is used to automatically cut the excess pin wire ends on the capacitor. The tooling seat 6 is provided with a plug-in slot 62 and a positioning structure 63. The plug-in slot 62 is used for inserting the tail of the brush holder. The plug-in slot 62 is provided with multiple pins for inserting the pins on the tail of the brush holder; the positioning structure 63 is used to position the tail of the brush holder inserted into the plug-in slot 62. The positioning structure 63 is a ball plunger structure, and its ball head 631 can move in and out of the plug-in slot 62. The compression spring 632 in the ball plunger presses the ball head 631 against the outer periphery of the tail of the brush holder to achieve positioning. The ball plunger can specifically be a hexagonal spring ball head screw.

[0050] The automatic shearing is a pneumatic shear, a hydraulic shear, or an electric shear. The wire cutting assembly 7 also includes a third drive execution unit 72 and a fourth drive execution unit 73. The third drive execution unit 72 is used to drive the automatic shear 71 to slide up and down, and the fourth drive execution unit 73 is used to drive the automatic shear 71 to slide horizontally to the corresponding positions of the two pins of the capacitor to achieve staged shearing. The processing table 2 is divided into a spot welding station and a wire cutting station; the capacitor spot welding assembly 3, the brush spot welding assembly 4, and the negative spot welding assembly 5 are arranged in the spot welding station, and the wire cutting assembly 7 is arranged in the wire cutting station; the body 1 is provided with a fifth drive execution unit 11, which is used to drive the tooling seat 6 to slide horizontally, such as longitudinally, between the spot welding station and the wire cutting station. The processing table 2 is provided with a longitudinal guide rail 64, and the tooling seat is slidably mounted on the guide rail; and the fourth drive execution unit 73 is used to drive the automatic shear 71 to slide horizontally. The automatic shear 71 is slidably mounted on a transverse guide rod 74.

[0051] The machine body 1 is provided with a material-removing assembly 8, which includes a material-removing shaft 81 and a sixth driving execution unit 82; the tooling seat 6 is provided with a through hole 61 passing through the upper and lower ends, and the material-removing shaft 81 is movably arranged in the through hole 61, and the sixth driving execution unit 82 is used to drive the material-removing shaft 81 to move upward to eject the brush holder assembly that has been completed welding on the tooling seat 6. The sixth drive execution unit 82 of the material stripping assembly 8 is located below the processing table and is located at the spot welding station or the wire trimming station. The material stripping shaft 81 is arranged on the tooling seat 6 and is a split structure with the output shaft 821 of the sixth drive execution unit 82. A through opening is provided on the processing table 2, which is located between the output shaft 821 of the sixth drive execution unit 82 and the material stripping shaft 81. The output shaft 821 of the sixth drive execution unit 82 extends upward and abuts against the material stripping shaft 81 on the tooling seat 6, and is separated from the material stripping shaft 81 after retraction. The material stripping assembly 8 also includes an elastic reset member 83, which is arranged between the tooling seat 6 and the material stripping shaft 81 to provide a driving force for the material stripping shaft 81 to reset downward. Of course, the output shaft 821 of the sixth drive execution unit 82 and the material stripping shaft 81 can be fixed or integrally arranged.

[0052] The aforementioned driving execution unit may be a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

[0053] The machine body 1 is provided with a control panel 10 for setting various parameters and monitoring the operating status of each component. Each component can be operated in sequence or started or shut down independently. Each component is equipped with an abnormality monitoring function and displayed on the control panel.

[0054] A movable universal wheel is installed at the bottom of the body 1; there is a box chamber inside the body, and the spot welding control host and the cooling water tank pump are installed in the box chamber. The positive connecting cable and the negative connecting cable are integrated with cooling water pipes and connected to the cooling water tank, which are used to cool the capacitor spot welding assembly, the brush spot welding assembly and the negative spot welding assembly.

[0055] Working principle of the present invention:

[0056] When in use, first set the welding time, spot welding voltage, spot welding pressure and other parameters of each welding point according to the process requirements on the control screen; place the brush holder assembly to be welded on the tooling seat, and insert the tail of the brush holder into the socket slot of the tooling seat, and the ball head of the ball head plunger on the tooling seat automatically presses the tail of the brush holder to pre-fix; start the switch, the spot welding machine equipment runs automatically, and the second drive execution unit of the negative spot welding assembly drives the negative welding head to press the brush holder downward, and the negative welding head contacts a pair of inserts; then two sets of capacitor spot welding assemblies and two sets of brush spot welding assemblies can simultaneously realize the spot welding of the two pins of the capacitor and the two brush wires. Welding, or spot welding one by one in sequence, such as the first drive execution unit in one group of capacitor spot welding components drives its positive welding head to touch one of the pins of the capacitor, and at the same time the high-current relay is powered on to connect the spot welding control host, and the spot welding control host discharges (the welding time is set according to the control screen) to complete the spot welding of one pin of the capacitor and the positive plug-in (due to the large instantaneous current during spot welding, a high-current relay will be equipped to control the circuit between the spot welding control host and the positive and negative welding heads). After the spot welding is completed, the high-current relay loses power and disconnects, and the positive welding head returns to its original position for standby; then another group of capacitor spot welding components is connected. The first driving execution unit in the welding assembly drives its positive welding head to touch the other pin of the capacitor to complete the spot welding with the negative plug-in, and then the positive welding head returns to its original position and waits; the two sets of brush spot welding assemblies also spot weld the two brush wires with the positive plug-in and the negative plug-in respectively in the same process, and then the positive welding head returns to its original position and waits; then the fifth driving execution unit drives the tooling seat to slide quickly to the wire trimming station, and the wire trimming assembly immediately performs the pin wire cutting operation, which is driven by the fourth driving execution unit 73 of the wire trimming assembly, which enables the automatic shears to accurately move to one of the capacitors. The sixth drive execution unit is used to drive the material removal shaft to move upward along the through hole. This action pushes the brush holder assembly that has been welded on the tooling seat upward, making it convenient for the operator or subsequent automated device to remove the finished product, and making room for the processing flow of the next brush holder assembly.

[0057] like Figure 10 、 11As shown, the finished brush holder assembly includes a brush holder 501, a brush 502 and a capacitor 503. The brush is provided with a positive electrode plug 5011 and a negative electrode plug 5012. The two pins of the capacitor are spot-welded to the two plugs respectively to form two capacitor welding points 504; the brush is provided with two, and is spot-welded to the two plugs respectively to form two brush welding points 505.

[0058] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. In the description of this disclosure, "several" means at least two, such as two or three, unless otherwise specifically defined.

[0060] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "coupled," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

Claims

1. A brush holder assembly automatic spot welding machine, characterized in that: It comprises a machine body (1) and a spot welding control host, wherein the machine body (1) is provided with a processing table (2), a capacitor spot welding assembly (3), a brush spot welding assembly (4) and a negative electrode spot welding assembly (5); A tooling seat (6) is provided on the processing table (2), and the tooling seat (6) is used to carry the brush holder assembly to be welded; The negative electrode welding head (51) of the negative electrode spot welding assembly (5) is connected to the negative electrode of the spot welding control host, and the negative electrode welding head (51) is used to press down the brush holder assembly to be welded on the tooling seat (6) and contact with a pair of inserts; The capacitor spot welding assembly (3) and the brush spot welding assembly (4) are both provided with a positive electrode welding head (31), the positive electrode welding head (31) being connected to the positive electrode of the spot welding control host, the positive electrode welding head (31) of the capacitor spot welding assembly (3) and the negative electrode welding head (51) being used to spot weld the pins of the capacitor in the brush holder assembly to be welded to the corresponding inserts; the positive electrode welding head (31) and the negative electrode welding head (51) of the brush spot welding assembly (4) being used to spot weld the brush wires in the brush holder assembly to be welded to the corresponding inserts; The machine body (1) is provided with a wire cutting assembly (7), which includes an automatic shear (71); the automatic shear (71) is located above the tooling seat (6) and is used to automatically cut off excess pin wire ends on the capacitor; The machine body (1) is provided with a material-removing assembly (8), and the material-removing assembly (8) includes a material-removing shaft (81) and a sixth driving execution unit (82); the tooling seat (6) is provided with a through hole (61) passing through the upper and lower ends, the material-removing shaft (81) is movably arranged in the through hole (61), and the sixth driving execution unit (82) is used to drive the material-removing shaft (81) to move upward to eject the brush holder assembly that has been welded on the tooling seat (6); The sixth drive execution unit (82) of the material-removing assembly (8) is located below the processing table, and the material-removing shaft (81) is arranged on the tooling seat (6) and is a split structure with the output shaft (821) of the sixth drive execution unit (82); a through opening is opened on the processing table (2), which is located between the output shaft (821) of the sixth drive execution unit (82) and the material-removing shaft (81); the output shaft (821) of the sixth drive execution unit (82) extends upward and abuts against the material-removing shaft (81) on the tooling seat (6), and is separated from the material-removing shaft (81) after retraction; the material-removing assembly (8) also includes an elastic reset member (83), which is arranged between the tooling seat (6) and the material-removing shaft (81) and is used to provide a driving force for the material-removing shaft (81) to reset downward.

2. The automatic spot welding machine for brush holder assembly according to claim 1, characterized in that: The capacitor spot welding assembly (3) and the brush spot welding assembly (4) are each provided with two groups and distributed on the periphery of the tooling seat (6). Each group of the capacitor spot welding assembly (3) and the brush spot welding assembly (4) is provided with a first driving execution unit (32), and the first driving execution unit (32) is used to drive the positive electrode welding head (31) to slide horizontally to approach or move away from the brush holder assembly to be welded located in the middle; the negative electrode spot welding assembly (5) is provided with a second driving execution unit (52), and the second driving execution unit (52) is used to drive the negative electrode welding head (51) to slide up and down to approach or move away from the brush holder assembly to be welded below.

3. The automatic spot welding machine for brush holder assembly according to claim 2, characterized in that: The welding head is made of tungsten-copper alloy material.

4. The automatic spot welding machine for brush holder assembly according to claim 1, 2 or 3, characterized in that: The thread cutting assembly (7) further comprises a third driving execution unit (72) and a fourth driving execution unit (73), wherein the third driving execution unit (72) is used to drive the automatic cutting tool (71) to slide upward and downward, and the fourth driving execution unit (73) is used to drive the automatic cutting tool (71) to slide horizontally to positions corresponding to two pins of the capacitor, so as to achieve staged cutting.

5. The automatic spot welding machine for a brush holder assembly according to claim 4, characterized in that: The processing table (2) is divided into a spot welding station and a wire trimming station; the capacitor spot welding assembly (3), the brush spot welding assembly (4) and the negative electrode spot welding assembly (5) are arranged at the spot welding station, and the wire trimming assembly (7) is arranged at the wire trimming station; a fifth driving execution unit (11) is provided on the machine body (1) for driving the tooling seat (6) to slide horizontally between the spot welding station and the wire trimming station.

6. The automatic spot welding machine for brush holder assembly according to claim 1, 2 or 3, characterized in that: The tooling seat (6) is provided with a plug-in slot (62) and a positioning structure (63), wherein the plug-in slot (62) is used for inserting the tail of the brush holder, and the positioning structure (63) is used for positioning the tail of the brush holder inserted into the plug-in slot (62).

7. The automatic spot welding machine for brush holder assembly according to claim 6, characterized in that: The positioning structure (63) is a ball plunger structure, wherein the ball head (631) can move in and out of the insertion slot (62), and the compression spring (632) in the ball plunger presses the ball head (631) against the outer periphery of the tail of the brush holder to achieve positioning.

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