PCB board solder joint tip sharpening rectification device and control method thereof

Abstract

The application discloses a PCB welding spot pull-sharpness rectification device and a control method thereof, which comprises a welding support (3), a fixed seat (4) is arranged on the welding support (3), a welding mechanism (5) is arranged on one side of the fixed seat (4), the welding mechanism (5) is a double-head structure, a camera support (6) is arranged on one side of the welding support (3), a top seat (7) is arranged on the upper end of the camera support (6), a straight plate (8) is arranged on the top seat (7), and a right-angle seat (9) is arranged on the straight plate (8). The application can effectively solve the phenomenon of PCB welding spot pull-sharpness, timely corrects the pull-sharpness defects of the plate body and improves the assembly efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the field of PCB welding equipment, in particular to a PCB welding spot tip sharpening device and a control method thereof. BACKGROUND

[0002] When the controller of a steering assist system is assembled, the PCB is first placed on the motor assembly. The metal sheet on the circuit board needs to be welded with the metal sheet of the motor assembly to realize circuit communication. The prior art is to place the board body and then weld the board body by a welding device. For example, a PCB welding equipment based on machine vision is disclosed in Chinese Patent No. CN114367715A. The equipment comprises a discharging module, a feeding module and a welding module. The discharging module is arranged on one side of the feeding module and can arrange the terminals in a regular manner. The feeding module comprises a grabbing assembly and a fixing assembly. The grabbing assembly is used to take and place the terminals in the discharging module to the specified position of the PCB. The fixing assembly is used to clamp and position the terminals and the PCB. The welding module is arranged on both sides of the feeding module. The welding module is used to weld the terminals and the PCB. The welding module comprises a six-axis mechanical arm, a vision camera and an execution device. The vision camera is used to obtain the image of the PCB to obtain the position information of the terminals and the PCB. This kind of PCB welding equipment places the board body flat and then welds the board body by the mechanical hand driving the welding module. The vision module is used to detect the welding spot and remove the defective board body. Manual processing is required to meet the standard. However, for the phenomenon of welding spot tip sharpening, the welding module can only melt the sharpening part, and the welding spot does not need to be removed. Removing and modifying the welding spot not only increases the labor burden, but also reduces the assembly efficiency. SUMMARY

[0003] The application aims to provide a PCB welding spot tip sharpening device and a control method thereof. The application can effectively solve the phenomenon of PCB welding spot tip sharpening, timely correct the tip sharpening defects of the board body and improve the assembly efficiency.

[0004] The technical scheme of the application is a PCB welding spot tip sharpening device. The device is arranged above the PCB to be welded. The PCB is placed on the upper end of the motor assembly. The device comprises a welding support. A fixing seat is arranged on the welding support. A welding mechanism is arranged on one side of the fixing seat. The welding mechanism has a double-head structure. A camera support is arranged on one side of the welding support. A top seat is arranged on the upper end of the camera support. A straight plate is arranged on the top seat. A right-angle seat is arranged on the straight plate. A CCD camera is arranged on the right-angle seat. The irradiation end of the CCD camera is aligned with the PCB. A blowing mechanism is arranged on the upper end of the welding mechanism.

[0005] In the aforementioned PCB board solder joint lifting and rectification device, the right-angle seat is provided with an arc-shaped adjustment hole. The right-angle seat is connected to the straight plate by bolts, and the bolts pass through the arc-shaped adjustment hole.

[0006] In the aforementioned PCB board solder joint lifting and rectification device, the blower mechanism includes a connecting block mounted on the welding mechanism. One end of the connecting block is equipped with an air gun. The air gun includes a gun body fixing frame, a support frame hinged to the gun body fixing frame, a transmission frame on one side of the gun body fixing frame, an angle motor mounted on the transmission frame, a transmission shaft mounted inside the transmission frame via a bearing, the output end of the angle motor being connected to the transmission shaft via a worm gear transmission, a spur gear on one end of the transmission shaft, an arc-shaped gear ring on one side of the support frame meshing with the spur gear, an air pump inside the support frame, an air tank connected to the input end of the air pump, and a gun rod connected to the output end of the air pump, with the end of the gun rod aligned with the soldering iron tip of the welding mechanism.

[0007] The control method for implementing the aforementioned PCB board solder joint pull-out correction device comprises the following steps:

[0008] S1: Based on the solder joint temperature, the PWM control of the welding current heats the soldering iron tip in the welding mechanism to the welding temperature, and solders the metal sheet on the PCB board to the metal sheet on the motor assembly. Then, the solder joint is detected by the CCD camera on the upper end of the camera bracket.

[0009] S2: Obtain solder joint images by taking pictures with a CCD camera, judge the condition of the solder joint. If there is too much or too little solder at the solder joint, control the welding current and the current of the solder feed motor through PWM, and then control the solder feed speed. Adjust the welding current to match the solder feed speed. If there is a solder joint tip, heat the solder joint through the soldering iron tip in the welding mechanism. One side of the soldering iron tip heats the solder joint, and the other side of the soldering iron tip heats the tipped part, and the solder in the tipped part is integrated into the solder joint.

[0010] S3: After the solder joint tip is corrected, the welding mechanism is withdrawn, and the blower mechanism is aligned with the soldering iron tip to prevent the solder joint from developing a tip again.

[0011] In the aforementioned PCB board solder joint lifting control method, in step 3, the welding mechanism should not take too long to exit, and the exit speed should be fast to reduce the occurrence of solder joint lifting again.

[0012] In the aforementioned PCB board solder joint pull-out rectification control method, in step 3, when the blower mechanism is running, the air gun draws gas from the air tank through the air pump and blows it out of the gun body towards the solder joint. The blowing angle of the gun body can be adjusted.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. In the present application, the welding mechanism welds the metal sheet of the PCB board and the motor assembly, and after welding, if the phenomenon of pulling the tip appears at the welding point, the welding mechanism moves to the welding point, the welding mechanism is a double-head structure, and the iron head on one side is powered to heat the main body of the welding point, and the iron head on the other side heats the pulled tip part, and the solder of the pulled tip part melts into the welding point, and then the welding mechanism exits, and at the same time, the blowing mechanism blows the iron head to avoid the phenomenon of pulling the tip again; by simultaneously heating the main body of the welding point and the pulled tip part, the pulled tip can be well melted into the welding point, and the pulled tip defect of the board body is corrected in time, compared with the conventional method of taking down the board for correction, the present application does not need to take down the board body, and then the correction is carried out on the production line, and the assembly efficiency is improved.

[0015] 2. The air gun in the blowing mechanism can swing at a certain angle, expand the blowing range, and improve the flexibility of the air gun.

[0016] 3. When the welding mechanism exits, the exit time cannot be too long, and the exit speed is relatively fast, so as to reduce the occurrence of the phenomenon of pulling the tip again. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application;

[0018] Figure 2 is a schematic diagram of a CCD camera;

[0019] Figure 3 is a schematic diagram of an arc-shaped adjusting hole;

[0020] Figure 4 is a schematic diagram of an air gun;

[0021] Figure 5 is a control flow chart of the present application.

[0022] Markings in the drawings: 1-PCB board, 2-motor assembly, 3-welding support, 4-fixing seat, 5-welding mechanism, 6-camera support, 7-top seat, 8-straight plate, 9-right-angle seat, 10-CCD camera, 11-blowing mechanism, 12-arc-shaped adjusting hole, 13-connection block, 14-air gun, 15-gun body fixing frame, 16-supporting frame, 17-transmission frame, 18-angle motor, 19-transmission shaft, 20-straight gear, 21-arc-shaped gear ring, 22-air pump, 23-air tank, 24-gun rod. DETAILED DESCRIPTION

[0023] The present application will be further described below in combination with the drawings and examples, but not as the basis for limiting the present application.

[0024] Example: PCB board welding point pulling tip correction device, the device is arranged above the PCB board 1 to be welded, as shown in the attachedFigure 1 As shown, the PCB board 1 is placed at the upper end of the motor assembly 2, including a welding support 3, the welding support 3 is provided with a fixing seat 4, one side of the fixing seat 4 is provided with a welding mechanism 5, the welding mechanism 5 is a double-head structure, one side of the welding support 3 is provided with a camera support 6, the upper end of the camera support 6 is provided with a top seat 7, the top seat 7 is provided with a straight plate 8, the straight plate 8 is provided with a right-angle seat 9, the right-angle seat 9 is provided with a CCD camera 10, as shown in the attached Figure 2 and 3 As shown, the irradiation end of the CCD camera 10 is aligned with the PCB board 1, the right-angle seat 9 is connected with the straight plate 8 through bolts, the bolts pass through the arc-shaped adjusting hole 12, which facilitates the adjustment of the irradiation angle of the CCD camera and increases the flexibility of use; the upper end of the welding mechanism 5 is provided with a blowing mechanism 11.

[0025] The blowing mechanism 11 includes a connecting block 13 arranged on the welding mechanism 5, one end of the connecting block 13 is provided with an air gun 14, as shown in the attached Figure 4 As shown, the air gun 14 includes a gun body fixing frame 15, the gun body fixing frame 15 is hinged with a support frame 16, one side of the gun body fixing frame 15 is provided with a transmission frame 17, the transmission frame 17 is provided with an angle motor 18, the transmission frame 17 is provided with a transmission shaft 19 through a bearing, the output end of the angle motor 18 is connected with the transmission shaft 19 through a worm gear transmission, one end of the transmission shaft 19 is provided with a straight gear 20, one side of the support frame 16 is provided with an arc-shaped gear ring 21, the arc-shaped gear ring 21 is engaged with the straight gear 20, the support frame 16 is provided with an air pump 22, the input end of the air pump 22 is connected with an air tank 23, the output end of the air pump 22 is connected with a gun barrel 24, the port of the gun barrel 24 is aligned with the iron head of the welding mechanism 5, the angle motor can drive the transmission shaft to rotate through the worm gear transmission, the straight gear at the end of the transmission shaft is engaged with the arc-shaped gear ring on the support frame, realizing the angle adjustment of the gun barrel, expanding the blowing range and improving the flexibility of the air gun, the transmission mode of the worm gear structure can realize the locking of the angle adjustment of the gun barrel, the outlet of the gun barrel is a conical structure, which can expand the outlet range and better blow on the iron heads on both sides.

[0026] The control method of the PCB solder joint sharpening and rectifying device is realized, and the specific steps are as follows:

[0027] S1: according to the welding temperature, PWM control welding current to heat the soldering iron head in the welding mechanism to the welding temperature, the metal sheet on the PCB and the metal sheet on the motor assembly are welded together, and then the welding point is detected by the CCD camera at the upper end of the camera support; PWM technology is a very effective technology for using microprocessor digital output to control analog circuit, which is widely used in measurement, communication, industrial control and other aspects. PWM technology involves two parameters of frequency and duty cycle. The frequency of PWM refers to the number of times the signal goes from high level to low level and back to high level in one second, that is, how many cycles the PWM has in one second. The duty cycle is the ratio of high level time to the whole cycle time in a pulse cycle.

[0028] S2: the welding point image is obtained by taking a picture by the CCD camera, and the welding point condition is judged. If the solder is excessive or insufficient at the welding point, the welding current and the current of the solder feeding motor are controlled by PWM, and then the solder feeding speed is controlled. Adjust the welding current to match the solder feeding speed. If the solder is excessive, reduce the duty cycle of the PWM signal and reduce the speed of the DC motor to reduce the feeding speed of the solder. If the solder is insufficient, the same applies. If the welding point has a sharp phenomenon, the soldering iron head in the welding mechanism is used to heat the welding point. One side of the soldering iron head heats the welding point, and the other side of the soldering iron head heats the sharp part. The solder of the sharp part melts into the welding point. The temperature of the welding point needs to be lower than the temperature of the previous welding.

[0029] S3: after the sharp part of the welding point is corrected, the welding mechanism exits. During this process, the temperature of the soldering iron head rises to the soldering temperature, and the air blowing mechanism is aligned with the soldering iron head, i.e. the connection position of the soldering iron head and the welding point, to prevent the welding point from producing a sharp phenomenon again. The whole control flow chart is shown in the attached Figure 5 The double heads of the welding mechanism use different current control to heat the temperature. First, heat the welding point with one side of the soldering iron head to the melting temperature of the welding point, and then heat the sharp part with the other side of the soldering iron head to the welding temperature. The soldering iron head that heats the welding point exits first, and the soldering iron head that heats the sharp part exits at the same time, and the air blower blows to prevent the sharp phenomenon from occurring again. The welding point temperature determines the welding gun exit speed and the blowing speed. The higher the welding point temperature, the faster the welding gun exit speed, and the smaller the blowing speed.

[0030] In step 3, the welding mechanism exits, and the exit time cannot be too long. The exit speed is fast, which reduces the occurrence of the welding point again.

[0031] In step 3, when the blowing mechanism operates, the air gun sucks the gas in the gas tank through the air pump, the gas tank stores a certain amount of compressed air, so that the output gas pressure is more stable and smooth, when the air gun operates, the air in the gas tank is released through the air pump, and then stable gas is generated, which is blown out of the gun body and blows towards the welding point, the blowing angle of the gun body can be adjusted, the blowing range is expanded, and the flexibility of use is improved. The welding rod feeding speed, the welding gun temperature, the air gun swing angle and the temperature are determined by receiving the welding point temperature and the CCD image feedback.

[0032] The working principle of the present application is that the welding mechanism welds the metal sheet of the PCB board and the motor assembly, and if the welding point appears to be pulled sharp after welding, the welding mechanism moves to the welding point, the welding mechanism is a double-head structure, and the two iron heads are heated, one side of the iron head is powered to heat the main body of the welding point, and the other side of the iron head is heated to melt the solder of the sharp part into the welding point, and then the welding mechanism exits, and at the same time, the blowing mechanism blows the iron head to avoid the phenomenon of pulling sharp again; by simultaneously heating the main body of the welding point and the sharp part, the sharp can be well melted into the welding point, and the plate body sharp defect is corrected in time, compared with the conventional need to take down the plate for rectification, the present application does not need to take down the plate body, and then rectifies on the production line, and improves the assembly efficiency.

[0033] The above embodiments only express the embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent application, and in the present embodiment, up, down, left, right, front, back only represent the relative position and not the absolute position. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A control method for a PCB board solder joint pull-out correction device, characterized in that: The PCB board welding point pull sharpening rectification device is arranged above the PCB board (1) to be welded, the PCB board (1) is placed on the upper end of the motor assembly (2), and the PCB board welding point pull sharpening rectification device comprises a welding support (3), a fixing seat (4) is arranged on the welding support (3), a welding mechanism (5) is arranged on one side of the fixing seat (4), the welding mechanism (5) is a double-head structure, a camera support (6) is arranged on one side of the welding support (3), a top seat (7) is arranged on the upper end of the camera support (6), a straight plate (8) is arranged on the top seat (7), a right-angle seat (9) is arranged on the straight plate (8), a CCD camera (10) is arranged on the right-angle seat (9), and the irradiation end of the CCD camera (10) is aligned with the PCB board (1); a blowing mechanism (11) is arranged on the upper end of the welding mechanism (5). The control method comprises the following steps: S1: according to the welding point temperature, the welding mechanism is heated to the welding temperature by PWM control welding current, and the metal sheet on the PCB board and the metal sheet on the motor assembly are welded together, then the welding point is detected by the CCD camera on the upper end of the camera support; S2: the welding point image is obtained by the CCD camera, the welding point condition is judged, if the welding point is excessive or insufficient, the welding current and the current of the welding material feeding motor are controlled by PWM, then the welding material feeding speed is controlled, the welding current is adjusted to match the welding material feeding speed, if the welding point has the pull sharpening phenomenon, the welding point is heated by the iron head in the welding mechanism, one side of the iron head heats the welding point, and the other side of the iron head heats the pull sharpening part, and the welding material of the pull sharpening part is melted into the welding point; S3: after the pull sharpening part of the welding point is rectified, the welding mechanism exits, and the blowing mechanism is aligned with the iron head to prevent the welding point from being pulled again.

2. The control method of the PCB pad sharpening device according to claim 1, wherein: The right-angle seat (9) is connected with the straight plate (8) through bolts, and the bolts pass through the arc-shaped adjusting holes (12).

3. The control method of the PCB pad sharpening apparatus according to claim 1, wherein: The blowing mechanism (11) comprises a connecting block (13) arranged on the welding mechanism (5), one end of the connecting block (13) is provided with an air gun (14), the air gun (14) comprises a gun body fixing frame (15), a supporting frame (16) is hinged to the gun body fixing frame (15), one side of the gun body fixing frame (15) is provided with a transmission frame (17), the transmission frame (17) is provided with an angle motor (18), a transmission shaft (19) is arranged in the transmission frame (17) through a bearing, the output end of the angle motor (18) is connected with the transmission shaft (19) through a worm and gear transmission, one end of the transmission shaft (19) is provided with a straight gear (20), one side of the supporting frame (16) is provided with an arc-shaped gear ring (21), the arc-shaped gear ring (21) is meshed with the straight gear (20), and the supporting frame (16) is provided with an air pump (22).

4. The control method of the PCB pad sharpening apparatus according to claim 1, wherein: In step 3, the welding mechanism exits, the exit time of the welding mechanism cannot be too long, and the exit speed is relatively fast, so that the welding point is prevented from being pulled again.

5. The control method of the PCB pad sharpening apparatus according to claim 1, wherein: In step 3, the air gun blows the gas in the gas tank through the air pump, and the blowing angle of the gun body can be adjusted.

Images