A three-channel in-gas measuring and correcting device

Abstract

The utility model relates to three passageway gas inner surveying and correcting device technical field, and disclose a three passageway gas inner surveying and correcting device, including base, pass rule ring and joint, the base is equipped with air inlet for with outside gas source connects, pass rule ring connects in the upper portion of base, inside is provided with three independent gas passages each other, the joint is linked with pass rule ring, and the front end is equipped with three exhaust holes that are 120 degrees even distribution along the circumferential direction, and the exhaust hole is respectively first exhaust hole, second exhaust hole, third exhaust hole. Three passageway gas inner surveying and correcting device of the utility model, when the workpiece inner diameter exists local concave or surface defect, single passageway measurement is easy to appear error, and three passageway measurement can pass through the mutual compensation of multipoint signal, the stability of measurement result is improved significantly, anti -interference nature: three passageways work independently, and the overall result will not be influenced because single path is blocked or airflow fluctuation, and the anti -interference ability is stronger.

Description

Technical Field

[0001] This utility model relates to the technical field of three-channel internal gas measurement and calibration devices, specifically a three-channel internal gas measurement and calibration device. Background Technology

[0002] Currently, in precision machining, the inspection of internal diameter dimensions is a crucial step affecting the assembly accuracy and performance stability of workpieces. Traditional vernier calipers and micrometers suffer from insufficient accuracy and poor repeatability in measurements at the micrometer level. Pneumatic measurement technology utilizes the flow rate and pressure changes of high-pressure gas flowing in a tiny air gap to convert changes in workpiece geometry into air pressure or airflow signals. These signals are then amplified and displayed by a pneumatic measuring instrument, enabling non-contact, high-precision measurement.

[0003] Most existing air gap measurement calibration methods are single-channel or dual-channel designs. While they can meet certain measurement requirements, they still have shortcomings in terms of measurement stability, anti-interference performance, and detection range. Especially in the inner diameter measurement of complex parts, single-channel air gap signals are easily affected by local surface defects or slight eccentricities, leading to measurement errors.

[0004] Therefore, there is an urgent need for an internal gas calibration method with a reasonable structure, high measurement accuracy, and good stability to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a three-channel internal gas measurement and calibration device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A three-channel internal gas measurement and calibration device includes a base, a gauge collar, and a connector. The base has an air inlet for connecting to an external gas source. The gauge collar is connected to the upper part of the base and has three independent gas channels inside. The connector is connected to the gauge collar and has three exhaust holes evenly distributed at 120° along the circumference at its front end. The exhaust holes are designated as a first exhaust hole, a second exhaust hole, and a third exhaust hole. The first, second, and third exhaust holes are connected to the three gas channels, so that after the external gas source enters the three gas channels through the air inlet, it is discharged from the first, second, and third exhaust holes at the end of the connector, forming an air gap with the inner wall of the workpiece to be measured.

[0008] Preferably, the base is a disc-shaped structure with a positioning groove on its outer wall for installation in conjunction with the measuring platform.

[0009] Preferably, the air inlet is located on the lower end face of the base and is connected to the gauge ring through an internal pipeline.

[0010] Preferably, the first exhaust port, the second exhaust port, and the third exhaust port are each made of carbide nozzles.

[0011] Preferably, the gauge ring has an internal gas path baffle to make the three gas channels independent of each other and avoid airflow interference.

[0012] Preferably, the diameter of the first exhaust hole, the second exhaust hole, and the third exhaust hole is 1.5 mm.

[0013] Compared with existing technologies, this utility model has the following advantages: This three-channel internal gas measurement and calibration device,

[0014] 1. Three-channel detection: Enables multi-point measurement of the workpiece's inner diameter, eliminating the influence of local errors and resulting in higher measurement stability;

[0015] 2. High precision: The three signals compensate for each other, improving the overall measurement accuracy;

[0016] 3. Compact structure: The base, go gauge collar, and connector are highly integrated, facilitating installation and use;

[0017] 4. Wide adaptability: It can be used with pneumatic gauges or electronic column pneumatic gauges and is suitable for workpieces of different sizes and types. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is an overall structural diagram of the three-channel internal air measurement and calibration device of this utility model;

[0020] In the diagram: 1. Base; 2. Connector; 3. Go gauge collar; 4. Gas passage; 5. Air inlet; 6. First exhaust port; 7. Second exhaust port; 8. Third exhaust port. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present patent. In order to better illustrate the specific implementation of the present utility model, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size.

[0022] Please see Figure 1A three-channel internal gas calibration device includes a base 1, a gauge ring 3, and a connector 2. The base 1 has an air inlet 5 for connecting to an external gas source. The gauge ring 3 is connected to the upper part of the base 1 and has three independent gas channels 4 inside. The connector 2 is connected to the gauge ring 3 and has three exhaust holes evenly distributed at 120° along the circumference at its front end. The exhaust holes are a first exhaust hole 6, a second exhaust hole 7, and a third exhaust hole 8. The first exhaust hole 6, the second exhaust hole 7, and the third exhaust hole 8 are respectively connected to the three gas channels 4, so that after the external gas source enters the three gas channels through the air inlet 5, it is discharged from the first exhaust hole 6, the second exhaust hole 7, and the third exhaust hole 8 at the end of the connector 2, forming an air gap with the inner wall of the workpiece to be tested.

[0023] The base 1 is a disc-shaped structure with a positioning groove on its outer wall for installation in conjunction with the measuring platform.

[0024] The air inlet 5 is located on the lower end face of the base 1 and is connected to the gauge ring 3 through an internal pipeline.

[0025] Among them, the first exhaust hole 6, the second exhaust hole 7, and the third exhaust hole 8 are respectively made of hard alloy nozzles.

[0026] Among them, the inside of the go gauge ring 3 is equipped with a gas passage baffle, so that the three gas passages are independent of each other and the airflow interference is avoided.

[0027] Among them, the diameter of the first exhaust hole 6, the second exhaust hole 7, and the third exhaust hole 8 is 1.5mm.

[0028] It should be noted that the three-channel air internal measurement calibration of the present invention is mainly based on the pneumatic measurement principle. Its core idea is to convert the small differences in geometric dimensions into measurable air pressure signals by changing the air gap formed between the inner diameter surface of the workpiece and the exhaust hole of the connector 2 through the airflow.

[0029] When external compressed air enters the base air inlet 5, the gas enters the gauge ring 3 through the internal pipeline and is divided into three independent channels. Since the three gas channels are isolated from each other, the airflow is transmitted independently within them and finally flows to the three exhaust holes at the front end of the connector 2 respectively.

[0030] During the measurement process, connector 2 is inserted into the inner diameter of the workpiece being measured. The first exhaust hole 6, the second exhaust hole 7, and the third exhaust hole 8 maintain an appropriate gap with the inner wall of the workpiece, thus forming an air gap. After compressed air is ejected through the exhaust holes, due to the resistance of the air gap, some of the gas is blocked near the orifice, forming a back pressure. The magnitude of this back pressure is inversely proportional to the thickness of the air gap. When the inner diameter of the workpiece changes, the thickness of the air gap changes accordingly, resulting in a difference in exhaust pressure.

[0031] This difference is collected and amplified by a pneumatic gauge or an electronic column pneumatic gauge, and then converted into an electrical signal and displayed in numerical or pointer form, thereby achieving accurate measurement of the inner diameter of the workpiece.

[0032] The key role of the three-channel design is:

[0033] 1. Uniform sampling: The first vent hole 6, the second vent hole 7, and the third vent hole 8 are arranged at the front end of the connector 2 in a 120° uniform distribution to ensure that the inner diameter of the workpiece is sampled at multiple points during measurement, effectively eliminating local errors caused by factors such as workpiece ellipticity and eccentricity.

[0034] 2. Signal stability: When there are local depressions or surface defects in the inner diameter of the workpiece, single-channel measurement is prone to errors, while three-channel measurement can significantly improve the stability of the measurement results by compensating for each other through multiple signals.

[0035] 3. Anti-interference capability: The three channels work independently and will not be affected by the obstruction of a single path or airflow fluctuations, thus having a stronger anti-interference capability.

[0036] 4. Measurement Sensitivity: When the inner diameter of the workpiece changes slightly, the air gap thickness changes accordingly, resulting in a sharp change in the back pressure signal. Simultaneous monitoring via three channels can achieve higher measurement sensitivity.

[0037] The specific measurement steps are as follows:

[0038] (1) Install the gas internal calibration on the measurement platform so that the base fits tightly with the platform;

[0039] (2) Connect an external compressed air source and adjust the air source pressure to the specified value;

[0040] (3) Insert the connector 2 into the inner diameter of the workpiece to be tested, so that the first vent hole 6, the second vent hole 7, and the third vent hole 8 are evenly distributed near the inner wall surface.

[0041] (4) After ventilation, the gas is discharged independently through three channels, forming a stable air gap with the inner wall of the workpiece;

[0042] (5) Collect the exhaust back pressure signal and amplify and display it using a pneumatic gauge or an electronic column pneumatic gauge;

[0043] (6) Obtain the actual inner diameter of the workpiece based on the displayed reading.

[0044] In terms of measurement accuracy, the three-channel internal air measurement calibration of this invention can achieve the micron level, making it suitable for the inspection of high-precision workpieces (such as precision bearings, hydraulic components, and aerospace parts). When used in conjunction with CNC machining equipment, it can also achieve online measurement and real-time feedback, supporting automated production.

[0045] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-channel gas internal calibration device, comprising a base (1), a gauge collar (3), and a connector (2), characterized in that: The base (1) is provided with an air inlet (5) for connecting to an external air source. The gauge ring (3) is connected to the upper part of the base (1) and has three independent gas channels (4) inside. The connector (2) is connected to the gauge ring (3) and has three exhaust holes evenly distributed at 120° along the circumference at the front end. The exhaust holes are the first exhaust hole (6), the second exhaust hole (7), and the third exhaust hole (8). The first exhaust hole (6), the second exhaust hole (7), and the third exhaust hole (8) are connected to the three gas channels (4) respectively, so that after the external air source enters the three gas channels through the air inlet (5), it is discharged from the first exhaust hole (6), the second exhaust hole (7), and the third exhaust hole (8) at the end of the connector (2), forming an air gap with the inner wall of the workpiece to be tested.

2. The three-channel internal gas measurement and calibration device according to claim 1, characterized in that: The base (1) is a disc-shaped structure with a positioning groove on its outer wall for installation in conjunction with the measuring platform.

3. The three-channel internal gas measurement and calibration device according to claim 1, characterized in that: The air inlet (5) is located on the lower end face of the base (1) and is connected to the gauge ring (3) through an internal pipeline.

4. The three-channel internal gas measurement and calibration device according to claim 1, characterized in that: The first exhaust port (6), the second exhaust port (7), and the third exhaust port (8) are respectively made of hard alloy nozzles.

5. The three-channel internal gas measurement and calibration device according to claim 1, characterized in that: The gauge ring (3) is equipped with an air passage baffle inside, so that the three gas passages are independent of each other and the airflow interference is avoided.

6. The three-channel internal gas measurement and calibration device according to claim 1, characterized in that: The diameter of the first exhaust hole (6), the second exhaust hole (7), and the third exhaust hole (8) is 1.5 mm.

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