A nut projection welding machine for facilitating torque detection

Abstract

The utility model relates to welding equipment technical field, concretely is a nut projection welding machine convenient to detect torque, including frame, elevating gear, servo motor, welding head and positioning device, frame top installs hydraulic elevator drive equipment frame vertical motion, servo motor is fixed in equipment frame front side, its output passes through coupling and connects torque sensor, load shaft and welding head in proper order in proper order, welding head end is equipped with electrode access end and nut groove, positioning device is located frame bottom, including base, positioning rod and pressure sensor, servo motor and torque sensor's combination use make after welding can real -time monitoring nut welding's torque intensity, this accurate torque control help to avoid because torque is too big or too small leads to torque detection intensity deviation, the application of positioning device and pressure sensor, make work piece's contact pressure before and after welding be accurately controlled, and can give the controller in time feedback carries out corresponding adjustment.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, specifically to a nut projection welding machine that facilitates torque detection. Background Technology

[0002] In modern industrial manufacturing, the weld strength between the nut and the workpiece directly affects product reliability. Traditional projection welding machines mainly achieve welding by generating resistance heat through electric current on the electrodes, but they have the following technical drawbacks:

[0003] Torque detection lag: Traditional equipment cannot monitor torque intensity in real time during welding, requiring manual spot checks using an additional torque wrench or testing tool after welding. This offline inspection method is inefficient, costly, and cannot guarantee consistent welding quality for every product.

[0004] Inaccurate welding pressure control: The downward pressure of the welding head depends on manual experience for adjustment, which can easily lead to uneven pressure, resulting in incomplete welding (insufficient pressure) or workpiece deformation (excessive pressure).

[0005] Insufficient dynamic load response: During the welding process, if there are impurities or positional deviations on the contact surface between the nut and the workpiece, traditional equipment lacks real-time adjustment capabilities, which can easily lead to welding failure or insufficient torque strength. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a nut projection welding machine that facilitates torque detection.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A nut projection welding machine for easy torque detection, comprising a frame, on which a lifting device, a positioning device, a servo motor, and a welding head are mounted. The lifting device is mounted on the top of the frame, and an equipment rack is mounted on the output end of the lifting device. The servo motor is fixedly mounted on the front side of the equipment rack, and a torque sensor is mounted on the output end of the servo motor via a coupling. The torque sensor is mounted on a load shaft via a coupling, and the load shaft is connected to the welding head via a coupling. The welding head is provided with an electrode access end. The positioning device is mounted on the bottom of the frame and is perpendicular to the welding head. The bottom of the welding head is provided with a nut groove.

[0008] Preferably, the lifting device is a hydraulic lift, the output end of which passes through the top of the frame, and the equipment frame is fixedly installed at the output end of the hydraulic lift.

[0009] More preferably, the inner side of the frame is provided with a sliding groove, and the rear end of the equipment frame is slidably connected to the sliding groove via a sliding rod.

[0010] Preferably, the positioning device includes a base and a positioning rod, the positioning rod is mounted on the base, and the positioning rod is provided with a fixed rod.

[0011] Preferably, a pressure sensor is embedded in the base, the positioning rod is slidably mounted on the base, a receiving ring is mounted on the outer side of the base and the positioning rod, and a buffer spring is welded between the two receiving rings. A pressure rod is provided at the bottom of the positioning rod, and the pressure rod is adapted to the pressure sensor.

[0012] More preferably, the base has a slide rail on its side, the bottom of the positioning rod has a groove, and the inner wall of the groove is slidably connected to the slide rail by a limiting rod.

[0013] Preferably, a controller is installed on the side of the frame, and the controller is equipped with a display screen and control buttons. The pressure sensor, torque sensor, hydraulic lift and servo motor are connected to the controller through wires.

[0014] Compared with the prior art, this utility model provides a nut projection welding machine that facilitates torque detection, and has the following beneficial effects:

[0015] First, a hydraulic lift is used as the lifting device, ensuring stable vertical movement of the equipment frame. The design of the slide rails and guide rods further enhances the straightness and smoothness of the lifting process. This not only improves the overall stability of the equipment but also provides more precise position control for welding.

[0016] Secondly, the combination of a servo motor and a torque sensor allows for real-time monitoring of the torque intensity during nut welding after the welding process is complete. This precise torque control helps avoid deviations in torque detection intensity caused by excessive or insufficient torque.

[0017] Furthermore, the design of the positioning device, especially the application of pressure sensors, allows for precise control of the contact pressure of the workpiece before and after welding, and enables timely feedback to the controller for corresponding adjustments. The buffer spring effectively absorbs the impact force generated during welding, protecting the equipment from damage while improving welding accuracy.

[0018] Finally, closed-loop control of pressure and torque data via the controller dynamically adjusts the servo motor's operating parameters, ensuring that every weld meets preset quality standards. This intelligent control method significantly improves production efficiency, reduces the need for manual intervention, and lowers production costs. Attached Figure Description

[0019] Figure 1 This is a side view of the structure of this utility model;

[0020] Figure 2This is a schematic diagram of the structure of this utility model from below;

[0021] Figure 3 This is a schematic diagram of the positioning device of this utility model;

[0022] Figure 4 This is a schematic diagram of the base structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the positioning rod structure of this utility model;

[0024] In the diagram: 1. Frame; 2. Hydraulic lift; 3. Equipment rack; 4. Slide rail; 5. Servo motor; 6. Torque sensor; 7. Welding head; 8. Positioning device; 9. Controller; 10. Display screen; 11. Control buttons; 12. Electrode input end; 13. Nut groove; 14. Positioning rod; 15. Base; 16. Fixed rod; 17. Receiving ring; 18. Buffer spring; 19. Pressure sensor; 20. Slide rail; 21. Sleeve groove; 22. Pressure rod; 23. Limiting rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-5 This utility model discloses a nut projection welding machine for easy torque detection, comprising a frame 1, on which a lifting device, a positioning device 8, a servo motor 5, and a welding head 7 are mounted. The lifting device is mounted on the top of the frame 1, and an equipment frame 3 is mounted on the output end of the lifting device. The servo motor 5 is fixedly mounted on the front side of the equipment frame 3. A torque sensor 6 is mounted on the output end of the servo motor 5 via a coupling. The torque sensor 6 is mounted on a load shaft via a coupling. The load shaft is connected to the welding head 7 via a coupling. The welding head 7 is provided with an electrode access end 12. The positioning device 8 is mounted on the bottom of the frame 1 and is perpendicular to the welding head 7. A nut groove 13 is provided at the bottom of the welding head 7.

[0027] This nut projection welding machine, which facilitates torque detection, is primarily used for real-time monitoring and control of torque during the welding process to ensure welding quality. The equipment includes key components such as a frame 1, a lifting device, a positioning device 8, a servo motor 5, and a welding head 7. Through the coordinated operation of these components, a precise and stable welding process between the nut and the workpiece is achieved, and the torque strength of the nut after welding can be monitored in real time to ensure that it meets the standards, thereby guaranteeing welding quality and efficiency.

[0028] Core Structure

[0029] Frame 1: Main support frame, with a hydraulic lifting device installed at the top and a positioning device 8 at the bottom;

[0030] Lifting device: The hydraulic lift 2 drives the equipment frame 3 to move vertically, and the output end passes through the top of the frame 1;

[0031] Servo motor 5 and torque detection module: Servo motor 5 is fixed to the front side of equipment frame 3, and the output end is connected in series with torque sensor 6, load shaft and welding head 7 through coupling;

[0032] Welding head 7: The end is provided with an electrode access end 12 and a nut groove 13 for clamping the nut and welding;

[0033] Positioning device 8: The base 15 has a built-in pressure sensor 19, the positioning rod 14 slides and is guided by the slide rail 20 and the limiting rod 23, and the buffer spring 18 absorbs the welding impact.

[0034] Preferred technical solution

[0035] Lifting device optimization:

[0036] The inner side of the frame 1 is provided with a slide groove 4, and the rear end of the equipment frame 3 is slidably connected to the slide groove 4 through a slide rod to improve the lifting stability;

[0037] Positioning device 8 optimization:

[0038] The base 15 has a slide rail 20 on its side. The groove 21 at the bottom of the positioning rod 14 slides with the slide rail 20 through the limiting rod 23 to prevent swaying.

[0039] The positioning rod 14 is slidably fitted onto the base 15, and the buffer spring 18 is welded between the base 15 and the receiving ring 17 of the positioning rod 14 to absorb pressure and welding impact.

[0040] The pressure rod 22 at the bottom of the positioning rod 14 is adapted to the pressure sensor 19 inside the base 15 to provide real-time feedback of contact pressure.

[0041] Control system optimization:

[0042] The controller 9 is installed on the side of the frame 1, which integrates the display screen 10 and control buttons. It receives signals from the pressure sensor 19 and the torque sensor 6, and controls the hydraulic lift 2, servo motor 5 and electrode start and stop.

[0043] In this technical solution, the controller 9, torque sensor 6 and pressure sensor 19 can be related equipment with mature application technology. The controller 9 is, for example, a PLC (Programmable Logic Controller 9), the torque sensor 6 is, for example, the German HBM T210 series, BRSF-N-50N-m torque sensor 6, and the pressure sensor 19 is, for example, the Honeywell TJE series, MPX2010 / MPX5010 series pressure sensor 19.

[0044] The controller 9 integrates a display screen 10 and control buttons 11, enabling convenient information interaction and improving operational accuracy. The combination of control buttons 11 and display screen 10 enhances the user experience, and the device's operating status can be displayed on the display screen 10. If the device malfunctions, the display screen 10 can display fault codes or prompts, facilitating troubleshooting and maintenance.

[0045] Working principle and workflow

[0046] Mechanical Action Flow

[0047] Workpiece positioning stage:

[0048] The workpiece to be welded and the nut are placed on the upper limit of the fixed rod 16 of the positioning rod 14;

[0049] Welding head 7 pressing stage:

[0050] Start the hydraulic lift 2 to drive the equipment frame 3 to move down, and the welding head 7 presses the nut surface;

[0051] When the pressure rod 22 at the bottom of the positioning rod 14 contacts the pressure sensor 19 and reaches the preset pressure threshold (e.g., 100N), the controller 9 starts the power supply of the electrode to trigger the electrode of the welding head 7 to be energized to perform welding work on the nut.

[0052] Welding and torque testing stage:

[0053] After welding is completed, servo motor 5 drives the load shaft to rotate, and welding head 7 twists the nut with a preset torque (e.g., 20 N·m). If the welding point of the nut does not come off, the welding torque strength meets the standard.

[0054] The torque sensor 6 collects the actual torque value in real time. If the deviation exceeds ±5% (e.g., 18-22 N·m), the controller 9 adjusts the current of the servo motor 5.

[0055] Welding completion reset stage:

[0056] After welding is completed, the hydraulic lift 2 raises the equipment frame 3, the welding head 7 detaches from the workpiece, and the positioning rod 14 is reset by the buffer spring 18.

[0057] Control Logic Flow

[0058] Signal acquisition and processing:

[0059] Pressure sensor 19 signal: detects the contact pressure between welding head 7 and workpiece to determine whether welding is triggered;

[0060] Torque sensor 6 signal: Real-time torque feedback, dynamically adjusting the output of servo motor 5;

[0061] Closed-loop control:

[0062] The controller 9 drives the servo motor 5 according to the preset torque-current curve (TI curve) and corrects the speed or current through the torque sensor 6.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nut projection welding machine for easy torque detection, characterized in that, The assembly includes a frame (1), on which a lifting device, a positioning device (8), a servo motor (5), and a welding head (7) are installed. The lifting device is installed on the top of the frame (1), and an equipment rack (3) is installed at the output end of the lifting device. The servo motor (5) is fixedly installed on the front side of the equipment rack (3). A torque sensor (6) is installed at the output end of the servo motor (5) through a coupling. The torque sensor (6) is installed on a load shaft through a coupling. The load shaft is connected to the welding head (7) through a coupling. An electrode access end (12) is provided on the welding head (7). The positioning device (8) is installed at the bottom of the frame (1) and is perpendicular to the welding head (7). A nut groove (13) is provided at the bottom of the welding head (7).

2. The nut projection welding machine for easy torque detection according to claim 1, characterized in that, The lifting device is a hydraulic lift (2), the output end of which passes through the top of the frame (1), and the equipment frame (3) is fixedly installed at the output end of the hydraulic lift frame.

3. A nut projection welding machine for easy torque detection according to claim 2, characterized in that, The inner side of the frame (1) is provided with a slide groove (4), and the rear end of the equipment frame (3) is slidably connected to the slide groove (4) through a slide rod.

4. A nut projection welding machine for easy torque detection according to claim 3, characterized in that, The positioning device (8) includes a base (15) and a positioning rod (14). The positioning rod (14) is mounted on the base (15) and a fixed rod (16) is provided on the positioning rod (14).

5. A nut projection welding machine for easy torque detection according to claim 4, characterized in that, The base (15) is embedded with a pressure sensor (19), the positioning rod (14) is slidably mounted on the base (15), the outer side of the base (15) and the positioning rod (14) is fitted with a receiving ring (17), and a buffer spring (18) is welded between the two receiving rings (17). The bottom of the positioning rod (14) is provided with a pressure rod (22), and the pressure rod (22) is adapted to the pressure sensor (19).

6. A nut projection welding machine for easy torque detection according to claim 5, characterized in that, The base (15) has a slide (20) on its side, and the bottom of the positioning rod (14) has a sleeve groove (21). The inner wall of the sleeve groove (21) is slidably connected to the slide (20) through the limiting rod (23).

7. A nut projection welding machine for easy torque detection according to claim 6, characterized in that, A controller (9) is installed on the side of the frame (1). The pressure sensor (19), torque sensor (6), hydraulic lift (2) and servo motor (5) are connected to the controller (9) via wires.

8. A nut projection welding machine for easy torque detection according to claim 7, characterized in that, The controller (9) is equipped with a display screen (10) and control buttons (11).

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