Fixture for dimension measurement in quad flat package trial-production

Abstract

The present invention relates to the field of industrial fixtures, and specifically to a fixture for dimension measurement in quad flat package trial-production. The fixture comprises a main baseboard. Each of both sides of the top of the main baseboard is fixedly connected to a primary propping protection adjusting component. A main prop is fixedly connected to a center of the top of the main baseboard. The top of the main prop is fixedly connected to a measurement component. The primary propping protection adjusting components are disposed on the top of the main baseboard in a mirror symmetry manner. The top of the primary propping protection adjusting component is fixedly connected to a secondary propping protection adjusting component. A driven thread spindle is disposed, and when a driving thread spindle is rotated, the driven thread spindle moves towards a side far away from the driving thread spindle, and drives a fine adjustment gear under action of an auxiliary gear. Further,a front part of a movable spindle of the fine adjustment gear is fixedly connected to a dial gauge, to make a dimension of the fine adjustment gear be two or three times that of the auxiliary gear. Therefore, after the measuring bar presses a lead, the fine adjustment gear is rotated to enable the driven thread spindle to return for a distance, so that the measuring bar retracts in time to protectthe lead.

Description

technical field [0001] The invention relates to the field of industrial fixtures, in particular to a fixture for dimension measurement in the trial production of square flat packages. Background technique [0002] Fixtures are a large category of tools for woodworking, ironwork, fitters, machinery, electric control and other handicrafts. They are mainly used as a tool to assist in controlling position or movement. Fixtures can be divided into process assembly fixtures, project There are three types of test fixtures and circuit board test fixtures. The classification of fixtures and fixtures can be divided into process assembly fixtures, project test fixtures and circuit board test fixtures. Thin quad flat package pairs It is the most cost-effective packaging solution for applications with medium performance and low lead count requirements, and can get a light-weight unobtrusive package. The TQFP series supports a wide range of die sizes and lead counts, and the size range F...

AI Technical Summary

Problems solved by technology

[0003] Due to the small size of the square flat package, the accuracy of the measuring device is high, and a screw micrometer is required. The existing screw micrometer only has one driving method, that is, first rotate the first-level knob, and then rotate the fine-tuning Knob, although this process can improve further measurement results, there are deformable leads on the side of the quadrilateral flat package. After the first-level knob is rotated, after the measuring rod presses the lead, if you continue to rotate the fine-tuning knob, it is not conducive to the measurement. The rod is retracted in time to protect the lead wires, and the general spiral micrometer generally needs to be operated with both hands at the same time, and the measurement of small-sized parts under test takes a long time to correct before installation. During this process, the user's arm is suspended in the air. It is easy to tremble and affect the installation and correction effect of the test piece. During the measurement process, researchers with poor vision need to put their head close to the measurement device. This action will make the arm tend to move to the front of the body , the general arm support device only has a single support effect. For operators of different heights, the angles of the upper arm and elbow are different, so that the direction of force exerted by the lower arm on the support component is different. The existing support device does not It is beneficial to adjust the direction of support and protection in multiple directions and three-dimensionally

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