A spot welding device for smart watch manufacturing

Abstract

The application belongs to the technical field of spot welding, and particularly relates to a spot welding device for manufacturing smart watches, which comprises a welding table, one end of the welding table is rotationally connected with a rotating beam, the front end surface of the rotating beam is slidably connected with a cross beam, the cross beam is connected with the rotating beam through a screw rod, the top end of the rotating beam is fixedly connected with a motor, the output shaft of the motor is connected with the end portion of the screw rod, an electric welding machine is slidably connected on the cross beam, a button for controlling the motor is installed on the handle beside the electric welding machine, and a clamping assembly is arranged in the groove on the welding table. In the application, the electric welding machine is arranged on the slidable cross beam, the cross beam is connected with the rotating beam through the screw rod, and is driven by the motor. An operator can easily control the up-down movement, forward-backward movement and rotation of the electric welding machine through the button on the handle, and does not need to manually bear the weight of the electric welding machine and the cross beam, so that the operation strength is significantly reduced, and the convenience and work efficiency of the welding operation are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of spot welding technology, and more particularly to a spot welding device for manufacturing smartwatches. Background Technology

[0002] The spot welding machine adopts the principle of double-sided double-point overcurrent welding. During operation, the two electrodes press the workpiece so that the two layers of metal form a certain contact resistance under the pressure of the two electrodes. When the welding current flows from one electrode to the other electrode, it forms an instantaneous heat fusion at the two contact resistance points. The welding current flows instantaneously from the other electrode along the two workpieces to this electrode to form a circuit, and will not damage the internal structure of the workpiece being welded.

[0003] In the smartwatch manufacturing industry, chip welding is a critical process, and its welding quality directly affects the performance and stability of the smartwatch. Traditional spot welding devices use welding machines mounted on a rocker arm. During actual operation, operators need to manually adjust the welding pin position. This process requires bearing the weight of the welding machine and the rocker arm, easily leading to hand fatigue and affecting work efficiency and welding accuracy. Therefore, corresponding improvements have been made to address this issue. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, this invention proposes a spot welding device for the manufacture of smartwatches.

[0005] This invention proposes a spot welding device for manufacturing smartwatches, comprising a welding table, a rotating beam rotatably connected to one end of the welding table, a crossbeam slidably connected to the front end face of the rotating beam, and the crossbeam connected to the rotating beam via a screw. A motor is fixedly connected to the top end of the rotating beam, and the motor output shaft is connected to the end of the screw. A welding machine is slidably connected to the crossbeam, and a button for controlling the motor is installed on the handle on the side of the welding machine. A clamping assembly is provided in a groove on the welding table. A chip is placed onto the clamping assembly, and then the handle is gripped to apply force, pulling the welding machine. The machine moves forward and backward along the crossbeam, pulling the welding machine and the rotating beam together to rotate. Pressing the up button with your thumb will drive the screw to rotate, causing the crossbeam and welding machine to move upward. Pressing the down button with your thumb will drive the screw to rotate, causing the crossbeam and welding machine to move downward. Releasing the button will stop the movement. This allows you to easily move the welding pins of the welding machine to the welding position on the chip, perform spot welding, and leave after welding is complete. During the operation, you do not need to use your hands to support the weight of the welding machine and the crossbeam.

[0006] Preferably, the clamping assembly includes a carrier plate located within a groove and elastically connected to the welding station. A pair of positioning plates are provided on the top of the carrier plate, and a pair of guide posts are also fixedly connected to the top of the carrier plate. The two ends of the guide posts pass through the two positioning plates respectively. An arc-shaped, elastic positioning piece is fixedly connected to the opposite side of the two positioning plates. The positioning plates and the carrier plate are connected by a transmission assembly. When the chip is placed between the two positioning pieces, the chip is initially stabilized by the squeezing force generated by the two positioning pieces. When the welding pin moves to contact the chip, the button is released. Even if there is an error in the reaction time, the chip on the carrier plate will move downward together with the welding pin, so as not to cause excessive squeezing of the chip by the welding pin. When the carrier plate moves downward, the two positioning plates are pushed towards the middle through the transmission assembly, causing the arc-shaped positioning pieces to deform and increase the fixing force on the chip. During the deformation process, the contact area between the positioning pieces and the chip also increases, thereby forming a stable fixation for the chip.

[0007] Preferably, a pair of springs are fixedly connected to the bottom wall of the groove, and the other end of the springs is fixedly connected to the carrier plate; when the welding machine leaves the chip, the carrier plate can be pushed back to the initial position by the elastic force of the springs.

[0008] Preferably, the transmission assembly includes a pair of shafts connected to the groove via shaft seats. Gear cylinders are fixedly sleeved at both ends of the shafts. Multiple racks I, which mesh with the corresponding gear cylinders, are fixedly connected to the bottom of the carrier plate. A pair of racks II, which mesh with the gear cylinders, are respectively inserted through both sides of the welding table. The top ends of the racks II are slidably connected to the adjacent positioning plate via slide rails. When the carrier plate moves downward, it synchronously drives the racks I to move. The racks I will mesh with the gear cylinders and drive the racks II to move. The two sets of racks II can push the two positioning plates towards the middle.

[0009] Preferably, a spot welding device for manufacturing smartwatches further includes: a temperature acquisition module installed near the welding needle of the welding machine for real-time monitoring of the weld spot temperature and generating a temperature change coefficient through a control module; a current acquisition module installed on the power supply circuit of the welding machine for real-time monitoring of the welding current stability and generating a current fluctuation coefficient through a control module; a pressure acquisition module installed on the welding machine at the contact position with the crossbeam for real-time monitoring of the contact pressure between the welding needle and the chip; the control module comprehensively analyzes the generated temperature change coefficient and current fluctuation coefficient to generate an evaluation coefficient, determines whether the current welding quality meets the requirements of normal welding, compares the evaluation coefficient with a pre-set reference threshold, and controls the working state of the welding machine and motor based on the comparison result.

[0010] Preferably, the output and input terminals of the temperature acquisition module, the output and input terminals of the current acquisition module, and the output and input terminals of the pressure acquisition module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminal of the welding machine and the input terminal of the motor, respectively.

[0011] Preferably, the control module executes the following steps to control the working state of the welding machine and motor based on the comparison results:

[0012] Real-time monitoring: The temperature acquisition module collects the solder joint temperature; the current acquisition module collects the welding current.

[0013] Coefficient calculation: The control module calculates the temperature change coefficient, current fluctuation coefficient, and evaluation coefficient;

[0014] Dynamic adjustment: If W λ <W 阈 : Maintain the current parameters; if W λ ≥W 阈 Reduce current and shorten welding time. 阈 This is a reference threshold.

[0015] Preferably, the logic for generating the temperature change coefficient is as follows:

[0016] S1. The actual temperature of the weld point at different times within time T during welding is obtained through the temperature acquisition module. The actual temperature obtained at time p within time T is calibrated as... p is a positive integer;

[0017] S2. Calculate the temperature change coefficient. The expression for the calculation is:

[0018]

[0019] In the formula, q represents the number of samples taken within time T.

[0020] Preferably, the logic for generating the current fluctuation coefficient is as follows:

[0021] S1. The welding current at different times within a time interval T during welding is obtained through the current acquisition module of the welding machine. The actual current acquired at time r within the time interval T is calibrated as... r is a positive integer;

[0022] S2. Calculate the current fluctuation coefficient. The expression for the calculation is:

[0023]

[0024] In the formula, is the average current over time T; s is the number of samples over time T.

[0025] Preferably, the control module performs formulaic analysis based on the following formula:

[0026]

[0027] In the formula, w1 and w2 are weighting coefficients, and w1 and w2 > 1.

[0028] Compared with the prior art, the present invention provides a spot welding device for manufacturing smartwatches, which has the following beneficial effects:

[0029] 1. A spot welding device for manufacturing smartwatches. This device sets an electric welding machine on a sliding crossbeam, which is connected to a rotating beam by a screw and driven by a motor. The operator can easily control the electric welding machine to move up and down, forward and backward, and rotate by simply pressing a button on the handle. There is no need to manually bear the weight of the electric welding machine and the crossbeam, which significantly reduces the intensity of operation and greatly improves the convenience and efficiency of welding operations.

[0030] 2. A spot welding device for manufacturing smartwatches, which, by setting up a clamping component and utilizing the elastic connection between a carrier plate and a welding station, combined with a positioning plate, positioning piece, and transmission component, allows the chip to move together with the welding pins during the welding process, even with operational reaction time errors, avoiding excessive compression. Simultaneously, as the carrier plate moves downwards, the transmission component pushes the positioning plate, causing the positioning piece to deform, increasing the fixing force and contact area of ​​the chip, effectively protecting the chip and improving the welding success rate.

[0031] 3. A spot welding device for smartwatch manufacturing, comprising a temperature acquisition module, a current acquisition module, and a pressure acquisition module, enables real-time monitoring of the solder joint temperature, welding current stability, and contact pressure between the welding pin and the chip. The control module calculates and comprehensively analyzes the temperature change coefficient and current fluctuation coefficient to generate an evaluation coefficient, which is then compared with a reference threshold to dynamically adjust the operating status of the welding machine and motor. This intelligent control mechanism ensures that all parameters are always in optimal condition during the welding process, effectively improving the consistency and stability of welding quality, meeting the high-precision manufacturing requirements of smartwatches, and reducing product defect rates. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the first angle structure of a spot welding device for manufacturing smartwatches proposed in this invention.

[0033] Figure 2 This is a schematic diagram of the second angle structure of a spot welding device for manufacturing smartwatches proposed in this invention.

[0034] Figure 3 For the present invention Figure 2 A magnified structural diagram at point A;

[0035] Figure 4 This is a schematic diagram of the welding machine structure of a spot welding device for manufacturing smartwatches proposed in this invention;

[0036] Figure 5 This is a system block diagram of a spot welding device for manufacturing smartwatches proposed in this invention.

[0037] In the diagram: 1. Welding table; 2. Rotating beam; 3. Crossbeam; 4. Welding machine; 5. Screw; 6. Motor; 7. Handle; 8. Button; 9. Carrier plate; 10. Positioning plate; 11. Positioning piece; 12. Guide post; 13. Rack 1; 14. Shaft post; 15. Rack 2; 16. Slide rail; 17. Gear cylinder; 18. Spring; 19. Temperature acquisition module; 20. Current acquisition module; 21. Pressure acquisition module; 22. Control chamber. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Reference Figures 1-5 A spot welding device for manufacturing smartwatches includes a welding table 1, a rotating beam 2 rotatably connected to one end of the welding table 1, a crossbeam 3 slidably connected to the front end face of the rotating beam 2, and the crossbeam 3 connected to the rotating beam 2 by a screw 5. A motor 6 is fixedly connected to the top end of the rotating beam 2, and the output shaft of the motor 6 is connected to the end of the screw 5. A welding machine 4 is slidably connected to the crossbeam 3. A button 8 for controlling the motor 6 is installed on the handle 7 on the side of the welding machine 4. A clamping component is provided in the groove on the welding table 1.

[0041] In use, place the chip onto the clamping assembly, then grip handle 7 and apply force to pull the welding machine 4 forward and backward along the crossbeam 3. Pulling the welding machine 4 and the rotating beam 2 together will rotate the welding machine 4. Pressing the up button on button 8 with your thumb will drive the screw 5 to rotate via motor 6, causing the crossbeam 3 and welding machine 4 to move upward. Pressing the down button on button 8 with your thumb will drive the screw 5 to rotate via motor 6, causing the crossbeam 3 and welding machine 4 to move downward. Releasing the button will stop the movement. This allows you to easily move the welding pins of the welding machine 4 to the welding position on the chip, perform spot welding, and leave after welding is complete. During the operation, you do not need to use your hands to support the weight of the welding machine 4 and the crossbeam 3.

[0042] In another embodiment, considering that in the prior art and the aforementioned solutions of this application, the stopping position of the welding needle is determined manually, there are time and operation errors, which can easily cause the welding needle to crush the chip. In this application, the downward movement of the welding machine 4 is paused by visual judgment and manual control of button 8. Therefore, in this solution, the clamping assembly includes a carrier plate 9 located in the groove and elastically connected to the welding table 1. A pair of positioning plates 10 are provided on the top of the carrier plate 9. A pair of guide posts 12 are also fixedly connected to the top of the carrier plate 9. The two ends of the guide posts 12 pass through the two positioning plates 10 respectively. Arc-shaped elastic positioning pieces 11 are fixedly connected to the opposite sides of the two positioning plates 10 respectively. The positioning plates 10 and the carrier plate 9 are connected by a transmission assembly.

[0043] In use, the chip is placed between the two positioning plates 11. The chip is initially stabilized by the squeezing force generated by the two positioning plates 11. When the soldering pin moves to contact the chip, the button 8 is released. Even if there is an error in the reaction time, the chip on the carrier board 9 will move downward together with the soldering pin, so as not to cause excessive squeezing of the chip by the soldering pin. When the carrier board 9 moves downward, the two positioning plates 10 are pushed towards the middle through the transmission component, so that the arc-shaped positioning plates 11 deform to increase the fixing force on the chip. During the deformation process, the contact area between the positioning plates 11 and the chip also increases, thereby forming a stable fixation for the chip.

[0044] A pair of springs 18 are fixedly connected to the bottom wall of the groove, and the other end of the springs 18 is fixedly connected to the carrier plate 9.

[0045] When in use, after the welding machine 4 leaves the chip, the carrier board 9 can be pushed back to its initial position by the elastic force of the spring 18.

[0046] The transmission assembly includes a pair of shafts 14 connected to the groove by a shaft seat. The two ends of the shafts 14 are respectively fixedly sleeved with toothed cylinders 17. The bottom of the carrier plate 9 is fixedly connected with a plurality of racks 13 that mesh with the corresponding toothed cylinders 17. The two sides of the welding table 1 are respectively provided with a pair of racks 15 that mesh with the toothed cylinders 17. The top of the racks 15 is slidably connected to the adjacent positioning plate 10 through a slide rail 16.

[0047] When in use, when the carrier plate 9 moves downward, it synchronously drives the rack 13 to move. The rack 13 will mesh with the gear cylinder 17 and drive the rack 2 15 to move. The two sets of racks 2 15 can push the two positioning plates 10 towards the middle.

[0048] In another embodiment, a spot welding apparatus for manufacturing smartwatches further includes:

[0049] Temperature acquisition module 19 is installed near the welding needle of welding machine 4 to monitor the temperature of the welding point in real time and generate a temperature change coefficient through the control module.

[0050] The current acquisition module 20 is installed on the power supply circuit of the welding machine 4 to monitor the stability of the welding current in real time and generate the current fluctuation coefficient through the control module.

[0051] The pressure acquisition module 21 is installed on the welding machine 4 at the contact position with the crossbeam 3, and is used to monitor the contact pressure between the welding needle and the chip in real time.

[0052] It should be noted that the temperature acquisition module 19 can be a miniature thermocouple (K-type) or other device capable of real-time monitoring of the solder joint temperature; the current acquisition module 20 can be a Hall effect current sensor or other device capable of real-time monitoring of the welding current; the pressure acquisition module 21 can be a miniature piezoresistive sensor or other device capable of real-time monitoring of the contact pressure between the solder pin and the chip; and the control module is an embedded controller (such as the STM32 series) that integrates data fusion algorithms. Therefore, the temperature acquisition module 19, current acquisition module 20, pressure acquisition module 21, and control module are not specifically limited here and can be selected according to actual needs.

[0053] During use, the control module comprehensively analyzes the generated temperature change coefficient and current fluctuation coefficient to generate an evaluation coefficient, which determines whether the current welding quality meets the requirements for normal welding. The evaluation coefficient is compared with a pre-set reference threshold, and the working status of the welding machine 4 and the motor 6 is controlled according to the comparison result. When the welding needle contacts the chip, the pressure acquisition module 21 will collect the pressure signal. At this time, the welding machine 4 can be started through the control module. If the welding machine 4 leaves the chip after welding is completed, the pressure signal disappears, and the welding machine 4 is automatically turned off.

[0054] The output and input terminals of the temperature acquisition module 19, the output and input terminals of the current acquisition module 20, and the output and input terminals of the pressure acquisition module 21 are electrically connected to the input and output terminals of the control module, respectively. The output terminal of the control module is electrically connected to the input terminal of the welding machine 4 and the input terminal of the motor 6, respectively.

[0055] In another embodiment, the control module performs a comprehensive analysis of the generated temperature change coefficient and current fluctuation coefficient to generate an evaluation coefficient, determines whether the current welding quality meets the requirements for normal welding, compares the evaluation coefficient with a pre-set reference threshold, and controls the working state of the welding machine 4 and the motor 6 based on the comparison result. The specific execution steps are as follows:

[0056] Real-time monitoring: Temperature acquisition module 19 acquires the temperature of the weld joint; current acquisition module 20 acquires the welding current;

[0057] Coefficient calculation:

[0058] Temperature variation coefficient: quantifies the efficiency of welding heat accumulation, characterizes the trend of solder joint temperature change over time, and reflects the rate of heat accumulation during the welding process; TΔ≈1: insufficient temperature rise → insufficient heat input → insufficient solder joint penetration → risk of cold solder joint; TΔ>>1: excessively rapid temperature rise → heat concentration → overheating of chip substrate → risk of burn-through.

[0059] The generation logic for the temperature change coefficient is as follows:

[0060] S1. The actual temperature of the weld point at different times during welding time T is obtained by the temperature acquisition module 19, and the actual temperature obtained at time p within time T is calibrated as... p is a positive integer;

[0061] S2. Calculate the temperature change coefficient. The expression for the calculation is:

[0062]

[0063] In the formula, q represents the number of samples taken within time T.

[0064] Current fluctuation coefficient: quantifies the stability of the welding circuit, characterizes the dispersion of the welding current, and reflects the resistance change at the electrode-chip contact interface; Iσ≈1: stable current → constant contact resistance → stable welding quality; Iσ>>1: current oscillation → sudden change in contact resistance → poor contact / short circuit risk;

[0065] The logic for generating the current fluctuation coefficient is as follows:

[0066] S1. The actual welding current at different times during welding time T is obtained through the current acquisition module 20 of the welding machine 4. The actual current obtained at time r within time T is calibrated as... r is a positive integer;

[0067] S2. Calculate the current fluctuation coefficient. The expression for the calculation is:

[0068]

[0069] In the formula, is the average current over time T; s is the number of samples over time T.

[0070] Evaluation coefficients: quantify the thermo-electric coupling effect, comprehensively consider the antagonistic relationship between temperature accumulation and current stability, and generate a comprehensive welding quality rating; formulaic analysis is performed through the control module, based on the formula:

[0071]

[0072] In the formula, w1 and w2 are weighting coefficients, and w1 and w2 > 1.

[0073] Dynamic adjustment: If W λ <W 阈 : Maintain the current parameters; if W λ ≥W 阈 To shorten welding time, the current is reduced, and the screw 5 is rotated by the motor 6 to drive the welding machine 4 away from the welding point. 阈 This is a reference threshold.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spot welding apparatus for manufacturing smartwatches, comprising a welding table (1), characterized in that, One end of the welding table (1) is rotatably connected to a rotating beam (2), and a crossbeam (3) is slidably connected to the front end face of the rotating beam (2). The crossbeam (3) is connected to the rotating beam (2) via a screw (5). A motor (6) is fixedly connected to the top end of the rotating beam (2). The output shaft of the motor (6) is connected to the end of the screw (5). A welding machine (4) is slidably connected to the crossbeam (3). A button (8) for controlling the motor (6) is installed on the handle (7) on the side of the welding machine (4). A clamping assembly is provided in the groove on the welding table (1). The welding table (1) also includes: The temperature acquisition module (19) is installed near the welding needle of the welding machine (4) to monitor the temperature of the welding point in real time and generate a temperature change coefficient through the control module. The generation logic of the temperature change coefficient is as follows: obtain the measured welding point temperature of the welding machine (4) at each sampling time within the welding cycle T, and take the temperature at the first moment as the reference value; perform exponential cumulative calculation based on the relative deviation of the temperature at each moment relative to the reference temperature to generate the temperature change coefficient characterizing the heat accumulation rate. The current acquisition module (20) is installed on the power supply circuit of the welding machine (4) to monitor the stability of the welding current in real time and generate the current fluctuation coefficient through the control module. The current fluctuation coefficient is generated by: obtaining the measured welding current of the welding machine (4) at each sampling time within the welding cycle T; and generating the current fluctuation coefficient that characterizes the current stability by performing exponential amplification calculation based on the standard deviation of the current at each time relative to the average current. The pressure acquisition module (21) is installed on the welding machine (4) at the contact position with the crossbeam (3) to monitor the contact pressure between the welding needle and the chip in real time; The control module in the control compartment (22) behind the rotating beam (2) performs dynamic trade-off calculations by coupling the temperature change coefficient and the current fluctuation coefficient, and combining them with weighting coefficients, according to the formula. An evaluation coefficient for quantifying the thermal-electric coupling effect is generated. This coefficient is then compared with a pre-set reference threshold. Based on the comparison results, the operating states of the welding machine (4) and the motor (6) are controlled. Where, , These are the weighting coefficients. .

2. The spot welding device for manufacturing smartwatches according to claim 1, characterized in that, The clamping assembly includes a carrier plate (9) located in the groove and elastically connected to the welding table (1). A pair of positioning plates (10) are provided on the top of the carrier plate (9). A pair of guide posts (12) are also fixedly connected to the top of the carrier plate (9). The two ends of the guide posts (12) pass through the two positioning plates (10) respectively. An arc-shaped elastic positioning piece (11) is fixedly connected to the opposite side of the two positioning plates (10). The positioning plates (10) and the carrier plate (9) are connected by a transmission assembly.

3. The spot welding device for manufacturing smartwatches according to claim 2, characterized in that, A pair of springs (18) are fixedly connected to the bottom wall of the groove, and the other end of the springs (18) is fixedly connected to the carrier plate (9).

4. A spot welding device for manufacturing smartwatches according to claim 2, characterized in that, The transmission assembly includes a pair of shafts (14) connected in the groove by a shaft seat. The two ends of the shafts (14) are respectively fixedly sleeved with toothed cylinders (17). The bottom of the carrier plate (9) is fixedly connected with a plurality of racks (13) that mesh with the corresponding toothed cylinders (17). The two sides of the welding table (1) are respectively provided with a pair of racks (15) that mesh with the toothed cylinders (17). The top of the racks (15) is slidably connected to the adjacent positioning plate (10) through a slide rail (16).

5. A spot welding device for manufacturing smartwatches according to claim 1, characterized in that, The output and input terminals of the temperature acquisition module (19), the output and input terminals of the current acquisition module (20), and the output and input terminals of the pressure acquisition module (21) are electrically connected to the input and output terminals of the control module, respectively. The output terminal of the control module is electrically connected to the input terminal of the welding machine (4) and the input terminal of the motor (6), respectively.

6. A spot welding device for manufacturing smartwatches according to claim 1, characterized in that, The control module controls the working state of the welding machine (4) and the motor (6) according to the comparison results. The execution steps are as follows: the temperature acquisition module (19) acquires the welding point temperature; the current acquisition module (20) acquires the welding current; the control module calculates the temperature change coefficient, the current fluctuation coefficient and the evaluation coefficient; when the evaluation coefficient is less than the reference threshold, the current working parameters are maintained; when the evaluation coefficient is greater than or equal to the reference threshold, the welding current is reduced and the welding time is shortened.

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