A small motor of a cooling fan of an automobile is selected welding structure

Abstract

The application provides a kind of automobile cooling fan small motor selection welding structure, it solves the problems of insufficient flexibility of existing welding equipment cantilever, low efficiency of welding gun switching, poor heat dissipation and smoke exhaust effect etc., it includes welding platform, cantilever assembly is movably installed in welding platform, welding assembly is movably installed on cantilever assembly, transmission assembly is arranged between welding platform and cantilever assembly, switching assembly is arranged between welding assembly and cantilever assembly;Cantilever assembly includes movable guide rail, movable screw, movable seat, first movable arm and second movable arm, adjusting assembly is arranged between first movable arm and second movable arm and welding platform;Welding assembly includes fixed clamp jaw, electric push rod and movable channel;Switching assembly includes sector plate and switching motor;Transmission assembly includes transmission pulley, transmission belt body and self-adaptive landing assembly.The application has the advantages of high degree of automation, quick gun changing, stable positioning, good heat dissipation and smoke exhaust effect etc.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, and specifically relates to a selective welding structure for a small motor of an automotive cooling fan. Background Technology

[0002] During the manufacturing process of small motors for automotive cooling fans, it is necessary to weld conductive parts such as stator winding leads, terminals, commutator segments, or connecting pieces. These motors are small in size, have densely packed terminals, and limited space for solder joints. Furthermore, different motor models vary in solder joint positions, welding angles, and process requirements. Therefore, welding equipment must possess high positioning accuracy, attitude adjustment capabilities, rapid switching capabilities between multiple welding torches, and excellent process monitoring performance. Currently, most existing welding equipment for small automotive cooling fan motors is of a fixed or simple cantilever structure, which mainly suffers from the following problems:

[0003] Existing cantilever welding platforms are mostly single-arm or fixed-arm structures, with limited degrees of freedom of movement, inconvenient welding posture adjustment, and inability to adapt to changes in welding point positions for different motor specifications. Furthermore, the cantilever arm itself lacks a weight-reduction design, resulting in high inertia and vibration during movement. The welding torch cable lacks a dedicated movement channel, leading to a messy cable arrangement that is prone to tangling and wear. In addition, the welding platform suffers from poor ventilation, heat dissipation, and fume extraction. Poor air circulation within the welding platform causes heat and fumes generated during welding to accumulate in the welding area, affecting welding quality and contaminating guide rails, sensors, and electrical components, reducing equipment stability and lifespan. Moreover, the lack of an adaptive positioning structure between the transmission mechanism and the welding platform means that workpieces are prone to tilting, jamming, and positioning misalignment when transferred to the welding station due to height differences or flatness deviations, requiring manual correction and impacting welding consistency and automated continuous production.

[0004] To address the aforementioned issues, this application proposes a selective welding structure for a small automotive cooling fan motor that offers high flexibility in welding adjustments, good support stability, and excellent continuous production performance. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed and highly flexible welding structure for small motors used in automotive cooling fans.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a selective welding structure for a small automotive cooling fan motor, comprising a welding platform, a cantilever assembly movably mounted within the welding platform, a welding assembly movably mounted on the cantilever assembly, a transmission assembly installed between the welding platform and the cantilever assembly, and a switching assembly disposed between the welding assembly and the cantilever assembly. The welding platform serves as a basic support, and the cantilever assembly is movably mounted relative to the welding platform, forming a movable cantilever kinematic chain. The welding assembly is mounted on the cantilever assembly, which provides the end-effector spatial position and orientation. The switching assembly is disposed between the welding assembly and the cantilever assembly and is used for selecting between multiple welding torches or welding tools. The transmission assembly is used to feed the motor workpiece to be welded into the welding area. This structure separates the main motion mechanism from the welding torch switching mechanism, allowing the cantilever assembly to primarily undertake positioning and support functions, while the switching assembly undertakes the multi-tool selection function, avoiding excessive load concentration at the end of the cantilever.

[0007] In the aforementioned welding structure for a small automotive cooling fan motor, the welding platform includes a crossbeam and longitudinal beams assembled into a frame structure. Air guide channels are provided within the crossbeams or longitudinal beams, and air guide grids connected to the air guide channels are located at the lower ends of the crossbeams or longitudinal beams. The crossbeams and longitudinal beams form a frame, providing a mounting base for cantilever components, transmission components, etc. Furthermore, the air guide channels within the crossbeams or longitudinal beams, with air guide grids at the lower ends, constitute an internal air duct. External air sources or the thermal pressure difference generated during welding cause the airflow to flow directionally through the air guide channels and air guide grids in the welding area, carrying away welding fumes and heat, and reducing the deposition of fumes on the surfaces of the guide rails, lead screws, and sensors.

[0008] In the aforementioned welding structure for a small automotive cooling fan motor, the cantilever assembly includes a movable guide rail located inside the welding platform. The movable guide rail extends along the X-axis of the welding platform and is connected to a movable seat via a movable screw. The movable seat is sequentially connected to a first movable arm and a second movable arm via swing joints. The first and second movable arms have a hollow structure and are fitted with adjustment components between themselves and the welding platform. The movable guide rail and the movable screw form a linear motion pair. When the movable screw rotates, the movable seat converts the rotational motion into linear displacement along the X-axis, achieving X-axis feed of the cantilever assembly inside the welding platform. The movable seat sequentially connects the first and second movable arms via swing joints, forming a series two-bar linkage. Each swing joint provides rotational freedom, allowing the joint angles of the first and second movable arms and the X-axis displacement of the movable seat to jointly determine the spatial position and orientation of the welding torch tip.

[0009] The first and second movable arms adopt a hollow structure. While maintaining the bending moment of inertia and torsional stiffness of the arm body section, material in low-stress areas is removed to reduce the arm body's weight. Since the end deflection during cantilever movement is mainly related to the arm body's weight and end load, reducing the weight helps to reduce static deflection caused by gravity and the moment of inertia during acceleration and deceleration. An adjustment assembly is installed between the first and second movable arms and the welding platform. During movement, in addition to the movable seat and swing joint, the arm body is also constrained by the follow-up support of the adjustment assembly, thereby limiting the arm body's sway and torsion in the non-moving plane and improving the stiffness of the cantilever end when the welding torch is fixed.

[0010] In the aforementioned welding structure for a small automotive cooling fan motor, the adjustment assembly includes a first adjustment guide rail installed inside the welding platform. The first adjustment guide rail is connected to a first adjustment block via a first adjustment screw. The first adjustment block is fixedly connected to a first adjustment rod. A first adjustment seat is slidably mounted on the first adjustment rod, and the first adjustment seat is rotatably connected to a first movable arm. A second adjustment guide rail is installed inside the welding platform. The second adjustment guide rail is connected to a second adjustment block via a second adjustment screw. The second adjustment block is fixedly connected to a second adjustment rod. A second adjustment seat is slidably mounted on the second adjustment rod, and the second adjustment seat is rotatably connected to a second movable arm. The first adjustment rod extends along the X-axis of the welding platform, and the second adjustment rod extends along the Y-axis of the welding platform.

[0011] The adjustment assembly employs two sets of orthogonally arranged follower support structures. The first adjustment guide rail is arranged along the X-axis, and the first adjustment screw drives the first adjustment block to move along the X-axis. A first adjustment rod is fixed to the first adjustment block and also extends along the X-axis. The first adjustment seat can slide along the first adjustment rod and is rotatably connected to the first movable arm. The second adjustment guide rail is arranged along the Y-axis, and the second adjustment screw drives the second adjustment block to move along the Y-axis. The second adjustment rod extends along the Y-axis. The second adjustment seat can slide along the second adjustment rod and is rotatably connected to the second movable arm. When the movable seat moves along the X-axis or the first and second movable arms rotate around the swing joint, the adjustment seat connected to the movable arm slides along the adjustment rod, while the adjustment block moves along the corresponding guide rail. Since the first adjustment rod is arranged along the X-axis and the second adjustment rod along the Y-axis, the two sets of follower constraints form orthogonal support directions in the horizontal plane, providing support reaction forces along the X-axis and Y-axis directions to the first and second movable arms, respectively. In this way, when the boom is subjected to the weight of the welding torch, the welding reaction force, and the inertial force of motion, part of the bending moment and lateral force are transmitted to the welding platform through the adjusting seat, adjusting rod, and adjusting block, instead of being entirely borne by the movable seat and the swing joint, thereby reducing the bending stress at the root of the cantilever and the concentrated load at the joint.

[0012] The adjustment seat and the movable arm are connected by a rotation, and the adjustment seat can slide along the adjustment rod. Therefore, the adjustment component does not restrict the angle changes of the first and second movable arms caused by the rotation of the swing joint. It only provides follow-up constraints during the movement so that the support direction always adapts to the movement of the arm.

[0013] In the aforementioned welding structure for a small motor used in an automotive cooling fan, the welding assembly includes a fixed gripper located at the end of the second movable arm for mounting the welding torch. An electric push rod for driving the welding torch to rise and fall is positioned between the fixed gripper and the second movable arm. A movable channel is provided between the first and second movable arms for the welding torch's wire to pass through. The fixed gripper holds the welding torch, maintaining it in a fixed position relative to the end of the second movable arm. The electric push rod, acting as a linear actuator, drives a lead screw or telescopic rod via a motor to generate vertical displacement, allowing the welding torch to feed or retract along the lifting direction during welding, thus controlling the distance between the welding torch and the workpiece. The movable channel between the first and second movable arms allows the welding torch's wire to pass through. The wire is separated from the arm's movement path, preventing additional tension or bending moment on the arm when the cantilever assembly moves. This avoids wire tension affecting end-positioning accuracy and reduces the probability of wire damage due to repeated bending.

[0014] In the aforementioned welding structure for a small motor in an automotive cooling fan, the switching component includes a sector-shaped disk rotatably mounted at the end of the second movable arm. A switching motor is positioned between the sector-shaped disk and the second movable arm, and the sector-shaped disk has several fixed grippers arranged circumferentially. The sector-shaped disk acts as a rotating indexing component, rotating around a pivot at the end of the second movable arm. The switching motor drives the sector-shaped disk to rotate, causing the multiple circumferentially arranged fixed grippers to sequentially reach their working positions. Each fixed gripper can hold welding torches of different specifications or types; therefore, the rotation of the sector-shaped disk enables online selection and switching of multiple welding torches. During the switching process, the rotation center of the sector-shaped disk is connected to the end of the second movable arm, and the welding torch rotates around this rotation center without changing the reference position of the cantilever end in space, which helps reduce the amount of repositioning required after switching.

[0015] In the aforementioned welding structure for a small automotive cooling fan motor, a temperature sensor is mounted on the fixed gripper. The sensor's detection end faces the welding end of the welding torch and is used to detect the temperature of the welding area. The sensor's wire passes through the movable channel between the first and second movable arms. With the detection end facing the welding end of the welding torch, the sensor acquires the temperature of the welding area through thermal radiation or conduction and transmits the temperature signal to the control system via the wire. This temperature signal can be used to determine whether abnormalities such as incomplete welding or overheating occur during the welding process, thus forming a closed-loop temperature monitoring system. The temperature sensor wire is arranged within the movable channel, running along the arm body along with the welding torch wire, avoiding interference between the wire and moving parts and reducing bending and stretching of the signal line during cantilever movement.

[0016] In the aforementioned welding structure for a small automotive cooling fan motor, a position scale is installed on the movable guide rail, and a position reading head that mates with the position scale is mounted on the movable seat. The position scale and the position reading head constitute a position sensor used to detect the displacement of the welding assembly along the X-axis of the welding platform. When the movable seat moves along the movable guide rail, the position reading head reads the scale or coded information on the position scale, converting the X-axis displacement into an electrical signal that is fed back to the control system. This position signal is used to correct for pitch errors, backlash, and position drift caused by thermal deformation during the movable lead screw drive process, enabling the actual position of the welding assembly along the X-axis to be detected and controlled.

[0017] In the aforementioned welding structure for a small automotive cooling fan motor, the transmission assembly includes transmission pulleys mounted on both sides of the welding platform and driven by the transmission motor. A transmission belt is driven by the transmission pulleys, and an adaptive positioning component is installed between the transmission belt and the welding platform. The transmission motor drives the transmission pulleys to rotate, causing the transmission belt to move and transport the workpiece to be welded to the welding station. The adaptive positioning component between the transmission belt and the welding platform adapts the workpiece's support height and flatness when it reaches the welding area, ensuring a stable positioning of the workpiece relative to the welding platform and reducing positioning errors caused by transmission belt height deviations or uneven workpiece surfaces.

[0018] In the aforementioned welding structure for a small automotive cooling fan motor, the adaptive positioning component includes several chain blocks connected end-to-end. Each chain block has a chain groove, and the conveyor belt has an extension that slides through the chain groove. The chain blocks are movably mounted on both sides of the welding platform. Connecting plates are provided between adjacent chain blocks, and these plates are movably connected to the chain blocks via sliding connecting grooves and connecting pins. The middle of each chain block is rotatably connected to a lifting push rod. The chain blocks, connected end-to-end, form a chain support unit. The extension of the conveyor belt slides through the chain groove, allowing the chain blocks to move vertically relative to the conveyor belt. The lifting push rod is rotatably connected to the middle of the chain block, and its extension and retraction drive the chain blocks to rise and fall, thereby adjusting the support height of the upper surface of the chain blocks. Adjacent chain blocks are movably connected via connecting plates, connecting grooves, and connecting pins, allowing relative displacement and angular changes between adjacent chain blocks to adapt to differences in the workpiece's bottom surface shape and the conveyor belt height, thus providing multi-point adaptive support for the workpiece at the welding station.

[0019] Compared with existing technologies, the advantages of this invention are as follows: the connecting rod cantilever, together with the X / Y orthogonal adjustment component, forms a follow-up support, dispersing the gravity of the welding torch and the welding reaction force, and improving the end-positioning stability; multiple fixed grippers are arranged circumferentially on the fan-shaped disk, and the torch can be selected online by switching the motor drive rotation, reducing downtime for torch replacement and repeated needle alignment; the platform crossbeam / longitudinal beam has built-in air guide grooves and air guide grids to form directional airflow, reducing welding heat and dust accumulation; the first and second movable arms are hollowed out and have movable channels to reduce the moment of inertia, and the wiring of the welding torch and sensor is orderly, reducing interference. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0022] Figure 3 This is a structural schematic diagram from another perspective of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the present invention;

[0024] Figure 5 This is a partially enlarged schematic diagram of the present invention;

[0025] Figure 6 This is another partially enlarged schematic diagram of the present invention;

[0026] In the figure, the components are: welding platform 1, crossbeam 11, longitudinal beam 12, air guide duct 13, air guide grid 14, cantilever assembly 2, movable guide rail 21, movable lead screw 22, movable seat 23, first movable arm 24, second movable arm 25, welding assembly 3, fixed gripper 31, electric push rod 32, movable channel 33, transmission assembly 4, transmission pulley 41, transmission belt body 42, chain block 43, chain groove 44, extension 45, connecting piece 46, lifting push rod 47, switching assembly 5, sector disk 51, switching motor 52, adjustment assembly 6, first adjustment guide rail 61, first adjustment lead screw 62, first adjustment block 63, first adjustment rod 64, second adjustment guide rail 66, second adjustment lead screw 67, second adjustment block 68, and second adjustment rod 69. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figure 1-6As shown, a selective welding structure for a small motor of an automotive cooling fan includes a welding platform 1, a cantilever assembly 2 movably mounted within the welding platform 1, a welding assembly 3 movably mounted on the cantilever assembly 2, a transmission assembly 4 installed between the welding platform 1 and the cantilever assembly 2, and a switching assembly 5 provided between the welding assembly 3 and the cantilever assembly 2.

[0030] The welding platform 1 is composed of a crossbeam 11 and a longitudinal beam 12 forming a rectangular frame. Both the crossbeam 11 and the longitudinal beam 12 are welded from structural steel. The crossbeam 11 has an air guide slot 13 inside, and the lower end of the crossbeam 11 is machined with an air guide grid 14 that communicates with the air guide slot 13. The air guide grid 14 has an elongated hole structure.

[0031] The cantilever assembly 2 includes a movable guide rail 21, which is fixed to the inner side of the two longitudinal beams 12 along the X-axis of the welding platform 1. A movable lead screw 22 is arranged parallel to the movable guide rail 21 and is driven by a servo motor. A movable seat 23 is connected to the movable lead screw 22 via a lead screw nut and slides along the movable guide rail 21. A first movable arm 24 is connected to the movable seat 23 via a first swing joint, and the first movable arm 24 is connected to a second movable arm 25 via a second swing joint. Both the first movable arm 24 and the second movable arm 25 are hollow aluminum alloy arms with low-stress areas removed from the interior.

[0032] A first adjusting guide rail 61, a first adjusting screw 62, a first adjusting block 63, a first adjusting rod 64, and a first adjusting seat are installed between the first movable arm 24 and the welding platform 1. The first adjusting rod 64 extends along the X-axis, and the first adjusting seat is slidably mounted on the first adjusting rod 64 and rotatably connected to the first movable arm 24 via a pin. A second adjusting guide rail 66, a second adjusting screw 67, a second adjusting block 68, a second adjusting rod 69, and a second adjusting seat are installed between the second movable arm 25 and the welding platform 1. The second adjusting rod 69 extends along the Y-axis, and the second adjusting seat is slidably mounted on the second adjusting rod 69 and rotatably connected to the second movable arm 25 via a pin.

[0033] The welding assembly 3 includes a fixed gripper 31, which is mounted on the end of the second movable arm 25 and is used to hold the welding torch. An electric push rod 32, a lead screw type electric cylinder, is disposed between the fixed gripper 31 and the second movable arm 25, and its output end is connected to the fixed gripper 31 via a connecting plate. A movement channel 33 is provided between the first movable arm 24 and the second movable arm 25, through which the welding torch wire passes.

[0034] The switching assembly 5 includes a sector-shaped disk 51, which is rotatably mounted on the end of the second movable arm 25 via a rotating shaft. The switching motor 52 is a stepper motor, fixed on the second movable arm 25. Three fixed grippers 31 are evenly arranged around the sector-shaped disk 51, and each fixed gripper 31 can be fitted with a different type of welding torch.

[0035] A temperature sensor is mounted on the fixed gripper 31. The temperature sensor is either a thermocouple or an infrared temperature sensor, with the sensing end facing the welding end of the welding torch. The temperature sensor wire is run through the movable channel 33.

[0036] A magnetic grating position scale is provided on the movable guide rail 21, and a magnetic grating reading head is installed on the movable seat 23, forming a position sensor for detecting the displacement of the welding assembly 3 along the X-axis.

[0037] The transmission assembly 4 includes transmission pulleys 41 mounted on both sides of the welding platform 1, which are driven by a transmission motor via a synchronous belt. The transmission belt 42 is a flat belt, tensioned on the transmission pulleys 41 on both sides. An adaptive positioning assembly is provided between the transmission belt 42 and the welding platform 1.

[0038] The adaptive positioning assembly includes several chain blocks 43, each with a chain groove 44. An extension 45 of the conveyor belt 42 is inserted into the chain groove 44 for sliding engagement. Adjacent chain blocks 43 are connected by connecting pieces 46, each with an elongated hole. A connecting pin passes through the elongated hole and the connecting groove on the chain block 43 to achieve sliding connection. The middle of each chain block 43 is rotatably connected to a lifting push rod 47 via a hinged seat. The lifting push rod 47 can be a pneumatic cylinder or an electric push rod.

[0039] During operation, the workpiece is transported to the welding station by the conveyor belt 42. The lifting push rod 47 adjusts the height of the chain block 43 to stably support the workpiece. The cantilever assembly 2 drives the welding assembly 3 to be positioned. The switching motor 52 selects the welding torch, and the electric push rod 32 drives the welding torch to descend for welding. Temperature and position sensors provide real-time feedback, and the air guide duct 13 discharges smoke and dust.

[0040] Example 2

[0041] The difference between this embodiment and Embodiment 1 is that: the first movable arm 24 and the second movable arm 25 adopt a hollow structure of carbon fiber composite material to further reduce the moment of inertia; the first adjusting screw 62 and the second adjusting screw 67 both adopt ball screws; and the first adjusting guide rail 61 and the second adjusting guide rail 66 adopt linear guide rails to improve the response accuracy of the follow-up support.

[0042] In the adjusting assembly 6, the first adjusting block 63 and the second adjusting block 68 are respectively connected to the corresponding lead screws via ball nuts. Linear bearings are installed in the first adjusting seat and the second adjusting seat, respectively, and slide in engagement with the first adjusting rod 64 and the second adjusting rod 69 to reduce friction. Both the first adjusting rod 64 and the second adjusting rod 69 are optical axes.

[0043] The fixed gripper 31 adopts a spring clamping structure, allowing for quick replacement of the welding torch manually or pneumatically. Four fixed grippers 31 are arranged circumferentially along the upper edge of the sector disk 51. The switching motor 52 is a servo motor, which drives the sector disk 51 to rotate through a worm gear reducer, improving the indexing accuracy.

[0044] The temperature sensor is an infrared temperature sensor, installed on the side of the fixed gripper 31. The detection end faces the welding area through a reflector to avoid direct splashing of weld slag. The position scale is a grating scale, and the position reading head is a grating reading head with a higher resolution than a magnetic grating.

[0045] Example 3

[0046] The difference between this embodiment and Embodiment 1 is that: both the crossbeam 11 and the longitudinal beam 12 of the welding platform 1 have air guide slots 13 inside, and both the crossbeam 11 and the longitudinal beam 12 have air guide grids 14 at their lower ends, forming a bidirectional airflow covering the welding area. The air guide slots 13 are connected to a negative pressure fan through pipes, so that welding fumes are drawn in through the air guide grids 14 and discharged through the air guide slots 13, achieving centralized ventilation.

[0047] In the cantilever assembly 2, the movable guide rail 21 has a double guide rail structure, the movable seat 23 cooperates with the double guide rail through four sliders, and the movable lead screw 22 is arranged between the double guide rails to improve the rigidity of the X-axis movement.

[0048] In the adaptive positioning assembly, the upper surface of the chain block 43 is provided with anti-slip teeth to increase friction with the workpiece. The connecting piece 46 is made of elastic metal sheet, and the connecting groove is an arc-shaped groove. The connecting pin can slide in the arc-shaped groove, so that adjacent chain blocks 43 can produce a small angle swing when the height changes, better adapting to the bottom shape of the workpiece.

[0049] The lifting push rod 47 is an electro-hydraulic push rod with a self-locking function, maintaining the height stability of the chain block 43 during welding. The extension 45 of the conveyor belt body 42 has a T-shaped cross-section, which cooperates with the T-groove of the chain groove 44 to prevent the extension 45 from coming off.

[0050] Example 4

[0051] The difference between this embodiment and embodiment one is that: two position scales are provided on the movable guide rail 21, located on both sides of the movable guide rail 21 respectively, and two position reading heads are installed on the movable seat 23 accordingly. The measurement error caused by the deflection of the movable seat 23 is eliminated by the differential reading of the two reading heads.

[0052] The temperature sensors consist of multiple thermocouples, each mounted on a fixed gripper 31, and connected to the control system via a multi-channel temperature acquisition module to enable independent temperature monitoring during multi-welding torch welding. The wires of each temperature sensor are threaded through the movable channel 33 and secured with flexible cable chains.

[0053] In the switching component 5, a positioning pin and a positioning hole are provided between the sector disk 51 and the second movable arm 25. After the switching motor 52 drives the sector disk 51 to rotate into position, the positioning pin is inserted into the positioning hole to lock it, preventing the sector disk 51 from being offset by reaction force during welding.

[0054] Both the first movable arm 24 and the second movable arm 25 are provided with reinforcing ribs. The reinforcing ribs extend along the length of the arm body and are located at the edge of the hollow area, which further improves the bending stiffness without significantly increasing the self-weight.

[0055] Example 5

[0056] The difference between this embodiment and Embodiment 1 is that the transmission pulley 41 of the transmission assembly 4 is a synchronous pulley, the transmission belt body 42 is a synchronous belt, and an extension 45 is provided on the back of the belt body. A wear-resistant bushing is provided in the chain groove 44 of the chain block 43 to reduce the sliding wear of the extension 45.

[0057] The crossbeam 11 and longitudinal beam 12 of the welding platform 1 are made of square steel pipes, the air guide duct 13 is the inner cavity of the square steel pipe, and the air guide grid 14 is laser-cut into a row of holes with the holes facing downwards, so that the airflow blows obliquely toward the welding point.

[0058] In the adjustment assembly 6, the drive motors of the first adjustment screw 62 and the second adjustment screw 67 are both stepper motors with brakes. When the power is off, the position of the adjustment block is locked to prevent the movable arm from being accidentally displaced under the action of gravity.

[0059] A laser positioning indicator is integrated on the fixed gripper 31. The laser spot is coaxial with the welding end of the welding torch, facilitating visual alignment. This laser positioning indicator does not change the original technical solution and serves only as an auxiliary positioning tool.

[0060] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0061] Although this document frequently uses terms such as welding platform 1, crossbeam 11, longitudinal beam 12, air guide duct 13, air guide grid 14, cantilever assembly 2, movable guide rail 21, movable lead screw 22, movable seat 23, first movable arm 24, second movable arm 25, welding assembly 3, fixed gripper 31, electric push rod 32, movable channel 33, transmission assembly 4, transmission pulley 41, transmission belt body 42, chain block 43, chain groove 44, extension 45, connecting piece 46, lifting push rod 47, switching assembly 5, sector disc 51, switching motor 52, adjusting assembly 6, first adjusting guide rail 61, first adjusting lead screw 62, first adjusting block 63, first adjusting rod 64, second adjusting guide rail 66, second adjusting lead screw 67, second adjusting block 68, and second adjusting rod 69, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A selective welding structure for a small motor of an automotive cooling fan, comprising a welding platform (1), wherein a cantilever assembly (2) is movably mounted within the welding platform (1), characterized in that, The cantilever assembly (2) is movably mounted with a welding assembly (3), a transmission assembly (4) is installed between the welding platform (1) and the cantilever assembly (2), and a switching assembly (5) is provided between the welding assembly (3) and the cantilever assembly (2).

2. The selective welding structure for a small motor of an automotive cooling fan according to claim 1, characterized in that, The welding platform (1) includes a crossbeam (11) and a longitudinal beam (12) assembled into a frame structure. A guide trough (13) is provided in the crossbeam (11) or the longitudinal beam (12). A guide grid (14) communicating with the guide trough (13) is provided at the lower end of the crossbeam (11) or the longitudinal beam (12).

3. The selective welding structure for a small motor of an automotive cooling fan according to claim 1, characterized in that, The cantilever assembly (2) includes a movable guide rail (21) disposed inside the welding platform (1). The movable guide rail (21) extends along the X-axis of the welding platform (1). The movable guide rail (21) is connected to a movable seat (23) via a movable lead screw (22). The movable seat (23) is connected to a first movable arm (24) and a second movable arm (25) via a swing joint. The first movable arm (24) and the second movable arm (25) have a hollow structure and are equipped with an adjustment assembly (6) between them and the welding platform (1).

4. The selective welding structure for a small motor of an automotive cooling fan according to claim 3, characterized in that, The adjustment assembly (6) includes a first adjustment guide rail (61) installed inside the welding platform (1), the first adjustment guide rail (61) being driven to a first adjustment block (63) via a first adjustment screw (62), the first adjustment block (63) being fixedly connected to a first adjustment rod (64), the first adjustment rod (64) being slidably mounted on a first adjustment seat, the first adjustment seat being rotatably connected to a first movable arm (24); a second adjustment guide rail (66) is installed inside the welding platform (1), the second adjustment guide rail (66) being driven to a second adjustment block (68) via a second adjustment screw (67), the second adjustment block (68) being fixedly connected to a second adjustment rod (69), the second adjustment rod (69) being slidably mounted on a second adjustment seat, the second adjustment seat being rotatably connected to a second movable arm (25); the first adjustment rod (64) extends along the X-axis of the welding platform (1), and the second adjustment rod (69) extends along the Y-axis of the welding platform (1).

5. The selective welding structure for a small motor of an automotive cooling fan according to claim 4, characterized in that, The welding assembly (3) includes a fixed gripper (31) located at the end of the second movable arm (25) for mounting the welding gun. An electric push rod (32) for driving the welding gun to rise and fall is provided between the fixed gripper (31) and the second movable arm (25). An active channel (33) for the welding gun wire to pass through is provided between the first movable arm (24) and the second movable arm (25).

6. The selective welding structure for a small motor of an automotive cooling fan according to claim 5, characterized in that, The switching component (5) includes a fan-shaped disk (51) rotatably mounted at the end of the second movable arm (25), and a switching motor (52) is provided between the fan-shaped disk (51) and the second movable arm (25). The fan-shaped disk (51) has a number of fixed grippers (31) arranged circumferentially.

7. The selective welding structure for a small motor of an automotive cooling fan according to claim 6, characterized in that, A temperature sensor is installed on the fixed gripper (31), with the detection end of the temperature sensor facing the welding end of the welding gun, for detecting the temperature of the welding area; the wire of the temperature sensor passes through the movable channel (33) between the first movable arm (24) and the second movable arm (25).

8. The selective welding structure for a small motor of an automotive cooling fan according to claim 3, characterized in that, The movable guide rail (21) is provided with a position scale, and the movable seat (23) is equipped with a position reading head that cooperates with the position scale. The position scale and the position reading head constitute a position sensor for detecting the displacement of the welding assembly (3) along the X-axis of the welding platform (1).

9. The selective welding structure for a small motor of an automotive cooling fan according to claim 1, characterized in that, The transmission component (4) includes transmission pulleys (41) installed on both sides of the welding platform (1) and connected to the transmission motor. The transmission pulleys (41) are connected to the transmission belt body (42). An adaptive positioning component is provided between the transmission belt body (42) and the welding platform (1).

10. The selective welding structure for a small motor of an automotive cooling fan according to claim 9, characterized in that, The adaptive positioning component includes several chain blocks (43) connected end to end. The chain blocks (43) have chain grooves (44). The conveyor belt body (42) has an extension (45) that is slidably connected to the chain grooves (44). The chain blocks (43) are movably installed on both sides of the welding platform (1). A connecting piece (46) is provided between adjacent chain blocks (43). The connecting piece (46) is movably connected to the chain block (43) through a sliding connecting groove and a connecting pin. The middle part of the chain block (43) is rotatably connected to the lifting push rod (47).

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