Ball contact pneumatic probe
By designing a ball-contact pneumatic probe, employing indirect and direct air outlet structures and ball contact, and combining a pressure sensor and cylinder connector, the problems of air leakage and scratches when measuring the inner bore of a cylinder by the pneumatic probe were solved, achieving rapid and accurate inner bore measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SANMENXIA ZHONGYUAN MEASURING INSTR
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-21
Smart Images
Figure CN224535045U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cylindrical internal hole measurement technology, and in particular to a ball contact pneumatic probe. Background Technology
[0002] Cylindrical inner holes are a common feature of mechanical products, and their dimensions affect the precision of the parts and the subsequent user experience. Currently, pneumatic bore gauges or pneumatic plug gauges are mainly used to measure inner holes. When using pneumatic bore gauges, attention must be paid to the dimensional tolerances and effective length of the bore being measured. If the effective length is too short, it may cause air leakage, making measurement impossible.
[0003] The patent application number "CN202021054930.2" discloses "a pneumatic probe and pneumatic measuring device for measuring the diameter of a blind hole". It mainly uses air to drive an elastic sheet that comes into contact with the hole to shake, thereby obtaining the inner diameter of the hole. However, during the measurement process, the elastic sheet may scratch the inner wall of the hole, affecting the product quality. Utility Model Content
[0004] The purpose of this invention is to provide a ball contact pneumatic probe for rapid and accurate measurement of the inner hole of a cylinder.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A ball-contact pneumatic probe is disclosed. The workpiece to be tested has a cylindrical inner hole. The pneumatic probe includes a probe body, which has a cylinder that matches the inner hole of the workpiece to be tested. The side wall of the cylinder has an indirect air outlet and a direct air outlet. A probe ball that contacts the inner hole of the workpiece to be tested is provided at the outlet of the indirect air outlet.
[0007] Preferably, a retaining ring is provided on the outer side of the measuring ball to prevent it from falling off, and the retaining ring does not contact the inner hole of the workpiece to be measured.
[0008] Preferably, the direct air outlet includes a first direct air outlet and a second direct air outlet arranged sequentially from top to bottom.
[0009] Preferably, there are two indirect vent holes, which are symmetrically arranged on the side wall of the cylinder.
[0010] Two first direct air outlets are provided, and the two first direct air outlets are symmetrically arranged on the side wall of the cylinder.
[0011] There are two second direct air outlets, which are symmetrically arranged on the side wall of the cylinder.
[0012] Preferably, the two indirect vent holes are located at both ends of the first through hole penetrating the side wall of the cylinder, the two first direct vent holes are located at both ends of the second through hole penetrating the side wall of the cylinder, and the two second direct vent holes are located at both ends of the third through hole penetrating the side wall of the cylinder.
[0013] Preferably, the probe body is mounted on the base via a positioning platform.
[0014] Preferably, the base sidewall is provided with a first cylinder connector, and the probe body is connected to a second cylinder connector, forming an air supply channel between the first cylinder connector, the second cylinder connector and the probe body.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. The cylindrical inner hole of the workpiece to be measured is measured through the air outlet of the probe body. Based on the different air volume in the air outlet, it can be calculated whether the inner hole size of the workpiece meets the requirements.
[0017] 2. A stable air supply is provided to the nozzle through the cylinder connector to ensure the reliability of the measurement process.
[0018] 3. A measuring ball is installed at the indirect air outlet, and the measuring ball contact measurement can be used to measure extremely narrow apertures, thus improving measurement accuracy. Attached Figure Description
[0019] Figure 1 This is a perspective view of the present utility model;
[0020] Figure 2 This is a perspective view of the present invention from another angle;
[0021] Figure 3 This is a three-dimensional view of the probe body;
[0022] Figure 4 This is a top view of the present invention;
[0023] Figure 5 for Figure 4 Sectional view A-A;
[0024] Figure 6 for Figure 5 A schematic diagram showing the placement of the workpiece to be tested.
[0025] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation
[0026] The present invention will now be further described with reference to the accompanying drawings.
[0027] Example 1
[0028] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, a ball-contact pneumatic probe is disclosed. The workpiece 6 to be measured has a cylindrical inner hole. The pneumatic probe includes a probe body 3, which has a cylinder 31 that matches the inner hole of the workpiece. The side wall of the cylinder 31 has an indirect air outlet 34 and a direct air outlet sequentially formed from top to bottom. A measuring ball 35 that contacts the inner hole of the workpiece is disposed at the outlet of the indirect air outlet 34. In this embodiment, the measuring ball 35 is a steel ball with a diameter of φ2.778mm. The diameter of the indirect air outlet 34 is φ3mm, and the bottom of the hole has a 90° conical recess, allowing the steel ball to roll on the conical recess under its own weight. Gas introduced into the probe body 3 flows out along the indirect air outlet 34 and the direct air outlet, and is then blocked by the inner hole of the workpiece 6. The measurement of the inner hole of the workpiece is achieved according to the change in the amount of gas discharged.
[0029] During testing, a standard workpiece (with the same structure as the workpiece to be tested 6, but whose inner hole has undergone multiple tests) is first placed on the cylinder 31 of the probe body 3. The inner hole of the workpiece blocks the indirect air outlet 34 and the direct air outlet, causing a change in its output pressure. A pressure sensor (not shown in the figure) connected to the workpiece converts the pressure signal into an electrical signal, which is then converted into a digital signal and displayed on the screen (not shown in the figure). This digital signal is recorded, completing the measurement of the inner hole of the standard workpiece. Afterward, the standard workpiece is removed, and the workpiece to be tested 6 is placed on the cylinder 31 of the probe body 3 to obtain the digital signal of the workpiece to be tested 6. Before measurement, the limit difference between qualified products and standard parts is determined according to product requirements. By comparing the difference between the digital signal of the workpiece to be tested 6 and the standard digital signal, it can be determined whether the workpiece to be tested 6 is qualified or unqualified. By sequentially placing the workpieces to be tested 6, rapid and accurate measurement can be achieved.
[0030] The aforementioned measurement process, in which pressure signals are converted into electrical signals by pressure sensors and then into digital signals, is a conventional technology and will not be described in detail in this embodiment.
[0031] like Figure 3 As shown, the direct air outlet includes a first direct air outlet 33 and a second direct air outlet 32 arranged sequentially from top to bottom.
[0032] like Figure 4 and Figure 5 As shown, there are two indirect air outlets 34, which are symmetrically arranged on the side wall of the cylinder 31.
[0033] Two first direct air outlets 33 are provided, and the two first direct air outlets 33 are symmetrically arranged on the side wall of the cylinder 31.
[0034] Two second direct air outlets 32 are provided, and the two second direct air outlets 32 are symmetrically arranged on the side wall of the cylinder 31.
[0035] The arrangement of symmetrical air vents in pairs makes the measurement results of the inner hole of the workpiece more accurate.
[0036] A steel wire retaining ring 36 is provided on the outside of the measuring ball 35 to prevent it from falling off, and an annular groove for installing the retaining ring 36 is machined at the opening of the indirect air outlet 34. Figure 5 As shown, for the measuring ball 35 and the retaining ring 36 on the left, the leftmost end of the measuring ball 35 contacts the inner hole of the workpiece to be measured, while the leftmost end of the retaining ring 36 is located to the right of the leftmost end of the measuring ball 35; for the measuring ball 35 and the retaining ring 36 on the right, the rightmost end of the measuring ball 35 contacts the inner hole of the workpiece to be measured, while the rightmost end of the retaining ring 36 is located to the left of the rightmost end of the measuring ball 35. This arrangement ensures that the retaining ring 36 does not contact the inner hole of the workpiece to be measured, thus not affecting the free rolling of the measuring ball 35, allowing it to smoothly measure the inner hole of the workpiece.
[0037] In this embodiment, to ensure the symmetry of the vent holes arranged symmetrically in pairs and to facilitate processing, a first through hole, a second through hole, and a third through hole are sequentially arranged from top to bottom on the cylinder 31. The two ends of the first through hole are respectively the two indirect vent holes 34 mentioned above; the two ends of the second through hole are respectively the two first direct vent holes 33 mentioned above; and the two ends of the third through hole are respectively the two second direct vent holes 32 mentioned above. Air guide holes for introducing air into the middle of the first and second through holes are connected to each other. The air guide hole of the third through hole is located at the bottom of the cylinder 31 and connects to the middle of the third through hole.
[0038] like Figure 1 , Figure 2 and Figure 4 As shown, the probe body 3 is mounted on the base 1 via the positioning platform 2.
[0039] The base 1 has a first cylinder connector 4 on its side wall, and the probe body 3 is connected to a second cylinder connector 5. An air supply channel is formed between the first cylinder connector 4, the second cylinder connector 5 and the probe body 3.
[0040] This device has a simple structure and is easy to use. It can achieve rapid and accurate measurement of the inner diameter of a cylinder; it can also reliably measure inner diameters with smaller diameters.
[0041] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.
[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.
[0043] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A ball-contact pneumatic probe, wherein the workpiece to be measured has a cylindrical inner hole, and the pneumatic probe includes a probe body, characterized in that: The probe body has a cylinder that matches the inner hole of the workpiece to be measured. The side wall of the cylinder is provided with an indirect air outlet and a direct air outlet. A measuring ball that contacts the inner hole of the workpiece to be measured is provided at the outlet of the indirect air outlet.
2. The ball contact pneumatic probe according to claim 1, characterized in that, The outer side of the measuring ball is provided with a retaining ring to prevent it from falling off, and the retaining ring does not contact the inner hole of the workpiece to be measured.
3. The ball contact pneumatic probe according to claim 1, characterized in that, The direct air outlet includes a first direct air outlet and a second direct air outlet arranged sequentially from top to bottom.
4. A ball contact pneumatic probe according to claim 3, characterized in that, Two indirect vents are provided, and the two indirect vents are symmetrically arranged on the side wall of the cylinder. Two first direct air outlets are provided, and the two first direct air outlets are symmetrically arranged on the side wall of the cylinder. There are two second direct air outlets, which are symmetrically arranged on the side wall of the cylinder.
5. A ball contact pneumatic probe according to claim 4, characterized in that, The two indirect vent holes are located at both ends of the first through hole penetrating the side wall of the cylinder, the two first direct vent holes are located at both ends of the second through hole penetrating the side wall of the cylinder, and the two second direct vent holes are located at both ends of the third through hole penetrating the side wall of the cylinder.
6. A ball contact pneumatic probe according to claim 1, characterized in that, The probe body is mounted on the base via a positioning platform.
7. A ball contact pneumatic probe according to claim 6, characterized in that, The base sidewall is provided with a first cylinder connector, and the probe body is connected to a second cylinder connector, forming an air supply channel between the first cylinder connector, the second cylinder connector and the probe body.