8results 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 utility model discloses a cylindrical lithium battery positive and negative electrode connecting device with a built-in BMS (Battery Management System) board, which comprises a negative electrode steel shell and a battery roll core arranged in the negative electrode steel shell, and also comprises a positive electrode connecting assembly, the positive electrode connecting assembly comprises a positive electrode aluminum cover and a positive electrode hardware column in contact with one surface of the positive electrode aluminum cover, one surface, deviating from the positive electrode hardware column, of the positive electrode aluminum cover is in contact with the positive electrode end of the battery roll core; elastic sheets are arranged at the edge of the inner ring of the negative electrode hardware ring at intervals, the elastic sheets are clamped with the inner ring at the opening end of the negative electrode steel shell, and one end, far away from the opening, of the negative electrode steel shell is in contact with the negative electrode of the battery roll core; the BMS mainboard is arranged on the positive electrode aluminum cover, and the negative electrode hardware ring is arranged on the BMS mainboard. By means of the design, clamping connection can be achieved through the positive electrode connecting assembly and the negative electrode hardware ring, so that a traditional welding mode is avoided, and meanwhile the working state of the round lithium battery can be monitored through the built-in BMS mainboard.

The utility model discloses a connecting pipe mounting structure for a shed frame of a varnish baking vehicle, which comprises a plurality of groups of connecting pipe bodies and two transverse frameworks, a plurality of lateral frameworks are fixedly mounted between the two transverse frameworks through bolts, and a support framework is fixedly mounted between the two transverse frameworks and positioned on one side of the lateral frameworks. The greenhouse further comprises a supporting frame which is fixedly connected to one side of a plurality of connecting pipe bodies through bolts, fastening frames are fixedly installed on the lower portions between the connecting pipe bodies through bolts, and installation plates are fixedly installed at the bottoms of the connecting pipe bodies. Through holes are symmetrically formed in the top of the mounting plate in a penetrating manner; and after the connecting pipe body is fixed, a user can conveniently install and fix the ceiling of the vehicle shed frame and the connecting pipe body, welding fixation is avoided, the installation efficiency is improved, and safety and practicability are improved.

The utility model discloses an embedded ground pile with a connecting structure, which comprises a spiral ground pile, a connecting port and a threaded inserting column, and further comprises a flange plate and a metal welding block which is used for replacing an upper-layer metal component to be directly welded and connected with the flange plate, and the flange plate is welded and connected with the top end of the spiral ground pile. Connecting openings are formed in the circle center of the flange plate and the circle center of the spiral ground pile, threaded inserting columns are inserted into the connecting openings, and metal welding blocks are connected to the tops of the threaded inserting columns in a welded mode. A good connecting structure is provided for the spiral ground pile and an upper-layer metal component through the metal welding block, and the problem that the spiral ground pile cannot be secondarily assembled with a spinning pile machine due to direct welding connection of the spiral ground pile and an upper-layer building, and the spiral ground pile cannot be recycled is solved.

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 present invention discloses a lower frame of an electric vehicle and a chassis using the frame, and relates to the technical field of new energy vehicles. The lower frame includes a front frame, a battery box fixing frame, a rear frame and a battery box lower shell. The front frame, the battery box fixing frame, the rear frame and the battery box lower shell are all thin-walled aluminum alloy parts. The front frame is located in front of the battery box fixing frame, and the front frame and the front side of the battery box frame are screwed together by four bolt groups. The rear frame is located behind the battery box fixing frame, and the rear frame and the rear side of the battery box frame are screwed together by four bolt groups. The battery box lower shell is located inside the battery box fixing frame, and the battery box lower shell is connected to the battery box frame by a screw around the bottom. The lower frame has the characteristics of no need for welding, simple process, high precision, light weight, high structural strength, modular assembly, and can adapt to small batch or customized production of electric vehicles.

The anti-falling measure equipment comprises a vertical frame plate and two parallel casting strips arranged on the inner side of the vertical frame plate and provided with mounting grooves, a plurality of column plates are arranged on the inner sides of the casting strips at equal intervals, the column plates are detachably connected with the casting strips, a plurality of connecting pipes are arranged on the column plates at equal intervals, and the connecting pipes are detachably connected with the vertical frame plate. A suspension structure is correspondingly and detachably arranged at the top of the chaining pipe, a gap is formed between every two adjacent column plates, a bearing structure is arranged between the gaps, a reinforcing frame is arranged at the bottom of the vertical frame plate, the inner side of the reinforcing frame is connected with the vertical frame plate through bolts, and a plurality of compression-resistant structures are arranged at the top of the reinforcing frame at equal intervals. The top of the column plate is integrally suspended and fixed through the suspension structure, the reinforcing frame is arranged at the bottom of the vertical frame plate, the adjusting disc at the bottom of the adjusting threaded rod is screwed so that the supporting disc can be tightly attached to the column plate at the top of the supporting disc, elastic auxiliary supporting is conducted on the column plate from the bottom, and multiple falling prevention is achieved.

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.