Ball diameter electro-pneumatic measuring instrument for symmetric ball socket

Abstract

The invention discloses a ball diameter electro-pneumatic measuring instrument for symmetric ball sockets. The ball diameter electro-pneumatic measuring instrument comprise an electro-pneumatic electronic column, a connecting rod provided with a first gas channel, a spherical pneumatic measuring head provided with a second gas channel, and a calibrating piece group, wherein the pneumatic measuring head is connected with a gas output end of the electro-pneumatic electronic column through the connecting rod; the calibrating piece group comprises a small calibrating piece provided with a first symmetric ball socket and a large calibrating piece provided with a second symmetric ball socket; the ball diameters of the pneumatic measuring head and a measured symmetric ball socket are greater than that of the first symmetric ball socket and less than that of the second symmetric ball socket; both sides of the pneumatic measuring head are each provided with a first cutting platform; gas output ports of the second gas channel respectively form upper and lower nozzles in the upper and lower spherical surfaces of the pneumatic measuring head; and flow discharge gaps among the upper and lower nozzles and ball socket walls of the first symmetric ball socket as well as flow discharge gaps among the upper and lower nozzles and ball socket walls of the second symmetric ball socket are all within a linear variation range of the flow discharge gaps. The ball diameter electro-pneumatic measuring instrument has the advantages of low cost, high detection precision, high repeatability precision, and high adaptability to the environment.

Description

technical field [0001] The invention relates to a measuring instrument for the inner diameter of a sphere, in particular to a measuring instrument for measuring the spherical diameter of a symmetrical ball socket. Background technique [0002] The symmetrical ball socket is a relatively common shape in the mechanical field, and is widely used in various precision instruments and equipment. The ball diameter error of the symmetrical ball socket will not only bring energy loss to precision instruments and equipment, but also affect the precision of precision instruments and equipment, so the detection of the ball diameter of the symmetrical ball socket is very important. At present, the measuring instrument usually used to detect the diameter of a symmetrical ball socket is a three-point inner diameter micrometer. The three-point inner diameter micrometer is also called a three-jaw inner diameter micrometer. The vertebral body makes the three measuring claws radially displace...

AI Technical Summary

Problems solved by technology

In the above measurement process, the measurement speed cannot be improved, so the measurement efficiency is low; at the same time, because the measurement point and the moving position of the three-point inner micrometer itself are not on the same diameter line, it does not conform to Abbe’s principle, and it is difficult to ensure The measuring claws that are close to the wall of the ball socket do not slide along the wall of the ball socket, and it is difficult to ensure that the three-point inner diameter micrometer itself does not shake. These factors will greatly reduce the measurement accuracy and repeatability of the three-point inner diameter micrometer. The highest measurement accuracy can only be accurate To 4μm, the highest repeatability can only be accurate to 4μm

When the ball diameter measurement accuracy of the tested ball socket is required to be controlled at 1 μm, a three-coordinate measuring machine is required, but the cost of the three-coordinate measuring machine is very expensive, and the price of a three-coordinate measuring machine is about 500,000 to 5 million. The three-coordinate measuring machine is not suitable for on-line inspection or line-side inspection in the general workshop environment due to its own characteristics

Images