Expansion spring type inner diameter gauge outfit

Abstract

The utility model discloses an expansion spring type inner diameter gauge outfit which comprises a connecting pipe. The front end of the connecting pipe is fixedly connected with two spring measuring heads, the outer circles of the two spring measuring heads are provided with front conical surfaces with small front parts and large rear parts, axial cutting grooves which are symmetrical along the axis are formed between the two spring measuring heads, the middle rear parts of the inner walls of the two spring measuring heads are provided with arc-shaped grooves which are connected with the axial cutting grooves, and the radial aperture between the two arc-shaped grooves is larger than the width of the axial cutting grooves; an ejector rod penetrates through the connecting pipe in a sliding manner, a conical surface is arranged at the front end of the ejector rod, the front section of the conical surface is arranged in the axial cutting groove, and the rear section of the conical surface is arranged in the arc-shaped grooves of the two spring measuring heads; the device can be suitable for detection of small orifices with different apertures, and the expansion spring measuring head can automatically contract, so that the expansion spring measuring head can smoothly enter the orifices to complete measurement without the help of auxiliary personnel, and the requirement of automatic measurement can be met.

Description

Technical Field

[0001] The utility model relates to an inner diameter gauge head, in particular to a spring-tensioned inner diameter gauge head used for an inner diameter dial gauge. Background Art

[0002] The existing inside diameter gauge head for inside diameter micrometer comprises a connected connecting tube and a tension spring probe, the front end of which is a protruding approximately cylindrical structure. Based on the inside diameter measurement principle, the diameter of the tension spring probe in a dilated state is larger than the diameter of the object to be measured. When using a tension spring inside diameter micrometer to measure the aperture of a deep hole, it is generally necessary to manually contract the tension spring probe of the inside diameter gauge head from a dilated state so as to smoothly insert the gauge head into the deep hole. In particular, when the deep hole port is "closed" due to welding or other reasons, if the tension spring probe is not manually compressed, the inside diameter gauge head cannot be smoothly inserted into the deep hole. However, forced insertion will cause serious wear or deformation of the gauge head, affecting the service life and measurement accuracy of the gauge head. Moreover, manual compression of the gauge head is not only inconvenient to operate, but also seriously affects the measurement efficiency and cannot realize automatic aperture measurement. Summary of the invention

[0003] The purpose of the utility model is to provide a spring-tensioned inner diameter gauge head in view of the above-mentioned deficiencies in the prior art, which can be suitable for detecting small orifices of different diameters, and its spring-tensioned probe can automatically retract, so as to smoothly enter the interior of the orifice to complete the measurement without the help of auxiliary personnel, and can meet the needs of automatic measurement.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a spring-tensioned internal diameter gauge, comprising a connecting tube; characterized in that: two spring probes are fixedly connected to the front end of the connecting tube, the outer circles of the two spring probes are provided with a front conical surface which is smaller in the front and larger in the rear, an axial groove symmetrical along the axis is provided between the two spring probes, the middle and rear parts of the inner walls of the two spring probes are provided with an arc groove connected to the axial groove, the radial aperture between the two arc grooves is larger than the width of the axial groove, a push rod slides through the connecting tube, the front end of the push rod is provided with a conical surface, the front section of the cone is placed in the axial groove, and the rear section of the cone is placed in the arc grooves of the two spring probes.

[0005] When in use, the expansion spring type inner diameter gauge head is installed on the inner diameter micrometer, the push rod contacts and links with the transmission rod inside the inner diameter micrometer, and the spring applies thrust to the push rod to open the expansion spring gauge head; when measuring the inner diameter, the two spring gauge heads are aligned with the hole to be measured and directly inserted into it. Due to the axial groove, the two expansion spring gauge heads can automatically shrink. The front conical surfaces at the front ends of the two expansion spring gauge heads have conical tips that are much smaller than the aperture size of the measured object. Therefore, the expansion spring gauge heads can be automatically introduced into the target measuring hole. Even if the hole mouth is "shrinking", there is no need to squeeze the two expansion spring gauge heads manually, so that they can smoothly enter the hole mouth to complete the measurement without the help of auxiliary personnel, which can meet the needs of automatic measurement and can be suitable for small hole mouth detection with different apertures.

[0006] As a further improvement of the utility model, the outer circles of the two spring probes on the rear side of the front conical surface are provided with a rear conical surface with a larger front and a smaller rear surface; when the hole has a shrinkage, it is conducive to the automatic withdrawal of the spring probe, further meeting the needs of automatic measurement;

[0007] As a further improvement of the utility model, the front conical surface of each spring probe is connected to the rear conical surface and the high points of the connection are located on the same radial plane; so that the spring probe and the inner wall of the aperture are in point contact in the same radial plane, which can improve the accuracy of measurement;

[0008] In summary, the utility model can be applied to the detection of small orifices with different apertures, and its spring-tensioned probe can automatically retract, thereby smoothly entering the orifice to complete the measurement without the help of auxiliary personnel, and can meet the needs of automatic measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a front view of the use state of the embodiment of the utility model.

[0010] Figure 2 for Figure 1 Cross-sectional view of the front end of the two spring probes. DETAILED DESCRIPTION

[0011] The utility model is further described below in conjunction with the accompanying drawings.

[0012] like Figure 1 , Figure 2As shown, a tension spring type inner diameter gauge head of this embodiment comprises a connecting tube 1, two spring probes 2 integrally connected to the front end of the connecting tube 1, the outer circles of the two spring probes 2 are respectively provided with a front conical surface 3 which is small in front and large in back and a rear conical surface 4 which is large in front and small in back, and the front conical surface 3 is connected to the rear conical surface 4 and the high points of the connection are all located on the same radial plane, that is, the two share a high point; an axial groove 5 symmetrical along the axis is provided between the two spring probes 2, an arc groove 6 connected to the axial groove 5 is provided at the middle and rear parts of the inner walls of the two spring probes 2, the radial aperture between the two arc grooves 6 is larger than the width of the axial groove 5, a push rod 7 slides through the connecting tube 1, and a conical surface 8 is provided at the front end of the push rod 7, the front section of the conical surface 8 is placed in the axial groove 6, and the rear section of the conical surface 8 is placed in the arc groove 6 of the two spring probes 2, that is, the middle part of the conical surface 8 is stuck at the sharp corner where the two arc grooves 6 and the axial groove 5 intersect.

[0013] When in use, the tension spring type inner diameter gauge head is installed on the inner diameter micrometer through the internal thread and other structures of the connecting pipe 1. The push rod 7 contacts and realizes linkage with the transmission rod inside the inner diameter measuring micrometer. The push rod 7 is pushed by its spring to make the two tension spring probes 2 in an open state. When measuring, the tension spring probes 2 are squeezed and contracted, forcing the push rod 7 to retreat, driving the internal transmission rod, so that the needle rotates to realize the inner diameter measurement. When measuring the inner diameter, the two spring probes 2 can be directly inserted into the hole 9 to be measured. Due to the axial groove 5, the two tension spring probes 2 can be automatically retracted. The front conical surface 3 at the front end of the two spring probes 2 has a conical tip much smaller than the aperture size of the measured object. Therefore, the spring probe 2 can be automatically introduced into the target measuring hole 9. Even if the hole has a shrinkage 10, there is no need to manually squeeze the two spring probes 2, so that the spring probe 2 can be smoothly inserted into the hole to complete the measurement. When the hole has a shrinkage 10, the rear conical surface 4 is conducive to the automatic withdrawal of the spring probe 2. No auxiliary personnel are needed to help, which can meet the needs of automatic measurement and can be applicable to small hole detection with different apertures within a certain range.

[0014] The front conical surface 3 and the rear conical surface 4 share a high point so that the spring probe 2 and the inner wall of the aperture are in point contact in the same radial plane, which can improve the accuracy of measurement;

[0015] The above embodiments are used for illustration, but it should be understood that the above embodiments are only used for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments.

Claims

1. A spring-tensioned inner diameter gauge head, comprising a connecting pipe; characterized in that: Two spring probes are fixedly connected to the front end of the connecting tube, and the outer circles of the two spring probes are provided with front conical surfaces that are smaller in the front and larger in the rear. An axial groove symmetrical along the axis is provided between the two spring probes, and arc grooves connected to the axial grooves are provided in the middle and rear parts of the inner walls of the two spring probes. The radial aperture between the two arc grooves is larger than the width of the axial groove. A push rod slides through the connecting tube, and the front end of the push rod is provided with a conical surface. The front section of the cone is placed in the axial groove, and the rear section of the cone is placed in the arc grooves of the two spring probes.

2. The spring-loaded inner diameter gauge head according to claim 1, characterized in that: The outer circles of the two spring probes at the rear sides of the front conical surfaces are both provided with rear conical surfaces which are larger at the front and smaller at the rear.

3. A spring-loaded inner diameter gauge as claimed in claim 1 or 2, characterized in that: The front conical surface of each spring probe is connected to the rear conical surface, and the high points of the connection are located on the same radial plane.

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