3results about How to "Avoid soldering" patented technology

The invention provides a high-density QFN packaging device lead firmness testing device, and the device comprises a clamping assembly which is used for fixing a QFN packaging device, and the QFN packaging device is provided with a plurality of bonding pads; the cover plate abuts against the surface, provided with the bonding pads, of the QFN packaging device, a plurality of preformed holes are formed in the cover plate, and each preformed hole is opposite to the corresponding bonding pad of the QFN packaging device in position and used for framing the bonding pad, so that isolation between the bonding pads is achieved, welding connection between the bonding pads is avoided in the subsequent process that leads are welded to the bonding pads, and the quality of the bonding pads is improved. Therefore, the test accuracy is improved.

The invention discloses a welding device for the production and processing of automobile parts, and the invention relates to the field of welding technology. In order to ensure the reliability of torque transmission, the shaft rod is made of high-strength steel, so that the shaft rod has a large mass. In the process of rotating to adjust the welding position, the mass of the shaft rod itself causes a large friction force, so that the torque between the shaft rod and the flange plate is too large, resulting in cracks caused by the excessive torque when the welding position is not cooled during the welding process. Therefore, the contact between the arc block and the groove cylinder makes the slide block slide in the slide groove of the groove plate, so as to drive the groove frame and the clamping wheel to clamp inward at the same time, so that the axis center of the shaft rod and the axis center position of the chuck mechanism are on the same straight line, so as to ensure the accuracy of the welding position of the flange plate and the shaft rod. At the same time, the clamping wheel contacts the shaft rod to be welded, and rolling is used to reduce the friction force, so that the torque between the flange plate and the shaft rod is reduced during the welding rotation process, so as to prevent the cracks caused by the excessive torque when the welding position is not cooled during the welding process.

The utility model discloses a four -way valve subassembly and air conditioner, four -way valve subassembly includes: main valve body, the connecting pipe subassembly includes with the multiple connecting pipes of main valve body connection, and multiple connecting pipes include the first connecting pipe, second connecting pipe and third connecting pipe along the axial direction arrangement of main valve body, and the first connecting pipe, second connecting pipe and third connecting pipe are located the same side of the radial direction of main valve body, and the distance of the end face of first connecting pipe, second connecting pipe and third connecting pipe any adjacent two connecting pipes deviating from main valve body to main valve body center axis is different, and the distance difference is 2mm to 6mm. According to the four -way valve subassembly of the utility model, through the distance of the end face of first connecting pipe, second connecting pipe and third connecting pipe any adjacent two connecting pipes deviating from main valve body to main valve body center axis is different, and the distance difference is 2mm to 6mm, effectively avoid the solder flow to adjacent connecting pipe and lead to the welding, guarantee the fluid in -flow connecting pipe to flow through smoothly, improve the reliability and overall performance of four -way valve subassembly.