There is no straight line in the existing spot welding machine for welding armature copper hook of power frequency output micromotor Displacement sensor Therefore, the deformation of welding copper hook can only be controlled by discharge capacity and pressure regulation. Obviously, such control is not enough for some high-end users and products. They must be able to accurately control the deformation and conduct post weld detection. At the same time, the trigger discharge of the existing spot welding machine is controlled by the travel switch, so the adjustment is difficult, the accuracy is poor, and the probability of spark splash is high.
summary of the invention
The purpose of the utility model is to provide a kind of reasonable design, which adopts straight line Displacement sensor The copper hook welding deformation control device for spot welding machine can control the deformation of copper hook accurately by controlling the deformation of copper hook.
The positive and negative electrodes (electrode I and electrode II) of the welding machine are equipped with relatively movable ones for detection Displacement sensor The relative distance and displacement between the two electrodes can realize the precise measurement and control of welding size. Compared with the existing welding technology, it has the advantages of eliminating the spatter of two electrodes and reducing the number of discharge operations by more than 27% compared with the existing welding technology, which can reduce the number of discharge between the two electrodes and display the same discharge probability between the two electrodes; 3. The qualified and unqualified products can be automatically detected through the preset upper and lower limits of the variant, so as to ensure the deformation quantity of copper hook.
Description of drawings
Figure 1 shows the overall structure of the existing copper hook welding device for spot welding machine;
Fig. 2 is the overall structure diagram of the utility model.
In the figure: 1 is microcomputer controller, 2 is compressed air intake pipe, 3 is air circuit reversing valve, 4 is cylinder, 5 is electrode II connecting rod fixed block, 6 is electrode II pressure spring, 7 is electrode II connecting rod, 8 is electrode II, 9 is touch type display, 10 is electrode I, 11 is electrode I connecting rod, 12 is electrode I pressure spring, 13 is signal conversion module, 14 is signal output line of linear displacement sensor, 1 5 is the sensor body fixed block, 16 is the sensor sliding core fixed block, 17 is the sensor sliding core, 18 is the sensor body, h is the height difference between electrode I and electrode II.
Specific implementation mode
The utility model is mainly composed of a cylinder 4 with electrode II connecting rod fixed block 5, an air circuit reversing valve 3 with a compressed air intake pipe 2 and a microcomputer controller 1, an electrode I pressure spring 12 arranged at the lower part of the cylinder 4, an electrode II connecting rod 7 with an electrode II and an electrode II pressure spring 6 on the electrode II connecting rod fixing block 5, and a sensor arranged on the electrode I connecting rod 11 The main body fixing block 15, the electronic ruler sliding core fixing block 16 on the electrode II connecting rod 7, the sensor body 18 with sensor sliding core 17 between the sensor body fixing block 15 and the sensor sliding core fixing block 16, the signal conversion module 13 placed on the microcomputer controller 1 and the touch display 9 are composed of the signal conversion module 13 and the touch type display device 9. The signal conversion module 13 is connected with the sensor body 18 through the sensor signal output line 14 Then.
When using, the spot welding machine will be initialized automatically after being powered on. After initialization, the spot welding machine is in the ready working state.
When the micro-computer controller 1 receives the starting signal, the spot welding machine enters the automatic working state, and the microcomputer controller 1 sends a signal to open the electric control gas circuit reversing valve 3. The compressed air introduced by compressed air intake pipe 2 is sent to cylinder 4. The air from cylinder 4 pushes electrode I down through electrode I, pressure spring 12, electrode I connecting rod 11, etc., and drives displacement sensor body 18 and electrode I to descend synchronously through fixed block 15 of linear displacement sensor. At the same time, the electrode II is pushed down by the electrode II connecting rod 7, and the sensor sliding core 17 and the electrode II are driven to fall synchronously by the sensor sliding core fixed block 16.
Because there is a height difference h between electrode I and electrode II in advance, electrode II reaches the surface of workpiece before electrode I and stops descending, and sensor sliding core 17 stops falling due to the action of sensor sliding core fixed block 16 on electrode II connecting rod 7. At the same time, as the cylinder 4 does not descend to the limited position, the pressure spring 6 of electrode II is compressed by connecting rod fixing block 5 to generate the appropriate pressure required for electrode II during welding. While electrode II stops, electrode I continues to drop driven by cylinder 4. When the cylinder descends, the microcomputer controller 1 continuously reads the position signal of the linear displacement sensor through the analog / digital signal conversion module 13. When the position signal is less than the preset initial discharge size (e.g. 1.0 mm, etc.), the welding controller on the start point welding machine of the microcomputer controller 1 carries out the welding process. When the welding is completed, the cylinder 4 does not rise immediately, but continues to read the position data between electrode I and electrode II to observe whether the data is within the range of the preset upper and lower limits. If it is within the range, the spot welding machine will continue to spot weld the next copper hook through the indexing mechanism. If not, the spot welding machine will automatically stop the spot welding of the copper hook of the motor armature The workpiece is automatically divided and checked to the defective station as defective product. In this way, the consistency of deformation of welding copper hook can be ensured reliably.