A precision measuring head with an annular air knife

Abstract

The present invention provides a precision measuring head with an annular air knife. The guide head, lip ring, first fixing ring, air cavity and second fixing ring are coaxially arranged, and a guide shaft is arranged on the central axis. A gas storage cavity is formed between the guide head and the lip ring. An air valve is installed at one end of the first fixing ring close to the air cavity 4. An inner shunt ring groove is installed along the connection between the first fixing ring and the lip ring of the air valve. A sensor with a probe is installed at the connection between the air cavity and the second fixing ring. The outer end of the probe is flush with the surface of the air cavity. A front inclined flow annular air knife is installed on one side of the lip ring close to the guide head. The horizontal length of the front inclined flow annular air knife is greater than the width of the gas storage cavity. A gap is formed between the front inclined flow annular air knife and the guide head. The structure of the present invention is simple, the operation is convenient, an annular air curtain is formed, the test efficiency is improved, and the test accuracy is guaranteed.

Description

Technical Field

[0001] The present invention mainly relates to the field of machining of cylinder block and cylinder head parts, and particularly relates to a precision measuring head with an annular air knife. Background Art

[0002] The crankshaft holes, camshaft holes, and balance shaft holes in engine cylinder block and cylinder head parts are all multi-discontinuous holes. These holes are key control items in the machining process of such parts and need to be measured 100%. Since the machining beat on the production line is very fast and there is no time to clean the parts, immediate detection must be carried out. At this time, cutting fluid and machining waste chips will remain in the measured holes of the parts. The gap between the measuring head and the measured hole is small. The liquid in these residues will form a liquid film on the wall of the measured hole, affecting the measurement accuracy, and will also contaminate the measuring head and the sensor, causing early damage. The waste chips will get stuck between the hole wall and the measuring head, squeezing and damaging the parts, resulting in the scrapping of the measured parts and the failure of the measurement.

[0003] The Chinese utility model patent has been publicly disclosed, with the application number CN201721561304.0 and the patent name: An installation device for inner and outer O-rings of a joint. The application date is November 21, 2017. The present invention relates to an installation device for inner and outer O-rings of a joint, including: a frame, on which a large turntable is provided. The large turntable is rotatable relative to the frame. A joint feeding mechanism, a joint feeding mechanism, a joint clamp height measuring mechanism, a joint flipping and oiling mechanism, an inner O-ring material transfer and insertion mechanism, an inner O-ring flattening mechanism, an outer O-ring picking and sleeving mechanism, and a finished product discharging and sorting mechanism are sequentially arranged around the large turntable. The installation device for inner and outer O-rings of a joint according to the present invention has a small occupied space, realizes full-automatic operation from feeding, assembly to discharging, has high assembly efficiency, saves a large amount of labor costs, shortens the assembly time, and also improves the yield rate of assembly. Summary of the Invention

[0004] The present invention provides a precision measuring head with an annular air knife. In view of the above-mentioned defects of the prior art, a precision measuring head with an annular air knife is provided, including a guiding head 1, a lip ring 2, a first fixing ring 3, an air cavity 4, and a second fixing ring 5. The guiding head 1, the lip ring 2, the first fixing ring 3, the air cavity 4, and the second fixing ring 5 are coaxially arranged, and a guiding shaft 6 is arranged on the central axis. A gas storage cavity 4 is formed between the guiding head 1 and the lip ring 2. An air valve 7 is installed at one end of the first fixing ring 3 close to the air cavity 4. An inner shunt ring groove 8 is installed along the connection between the first fixing ring 3 and the lip ring 2 of the air valve 7. A sensor 10 with a probe 9 is installed at the connection between the air cavity 4 and the second fixing ring 5. The outer end of the probe 9 is flush with the surface of the air cavity 4. A front obliquely flowing annular air knife 11 is installed on one side of the lip ring 2 close to the guiding head 1. The horizontal length of the front obliquely flowing annular air knife 11 is greater than the width of the gas storage cavity 4. A gap is formed between the front obliquely flowing annular air knife 11 and the guiding head 1.

[0005] Preferably, the gap width between the front oblique flow annular air knife 11 and the guide head 1 is smaller than the width of the air storage cavity 4.

[0006] Preferably, an air gap adjusting pad 12 is provided between the guide head 1 and the lip ring 2.

[0007] Preferably, a plurality of air valves 7 are evenly arranged along the circumferential surface of the first fixing ring 3, and the plurality of air valves 7 are symmetrically arranged.

[0008] Preferably, the sensor 10 is fixedly installed by bolts 13, and the bolts 13 are arranged at one end of the second fixing ring 5 away from the air cavity 4.

[0009] Preferably, the first fixing ring 3 is in a "convex" shape, the second fixing ring 5 is in a "concave" shape, and the first fixing ring 3 and the second fixing ring 5 are arranged in cooperation with each other.

[0010] Preferably, a triangular groove is provided on the first fixing ring 3, and a triangular protrusion is provided on one side of the second fixing ring 5 corresponding to the groove.

[0011] The beneficial effects of the present invention: simple structure, convenient operation, forming an annular air curtain, improving the test efficiency and ensuring the test accuracy. Description of the Drawings

[0012] Figure 1 is the structural diagram of the present invention;

[0013] Figure 2 is Figure 1 the enlarged structural diagram of the midpoint M;

[0014] In the figure,

[0015] 1. Guide head; 2. Lip ring; 3. First fixing ring; 4. Air cavity; 5. Second fixing ring; 6. Guide shaft; 7. Air valve; 8. Inner shunt ring groove; 9. Measuring element; 10. Sensor; 11. Front oblique flow annular air knife; 12. Air gap adjusting pad; 13. Bolt. Detailed Embodiments

[0016] Such as Figure 1-2As can be seen from the figure, the present invention includes: a seeker 1, a lip ring 2, a first fixing ring 3, an air cavity 4 and a second fixing ring 5; the seeker 1, the lip ring 2, the first fixing ring 3, the air cavity 4 and the second fixing ring 5 are coaxially arranged and a guiding shaft 6 is arranged on the central axis. An air storage cavity 4 is formed between the seeker 1 and the lip ring 2. An air valve 7 is installed at one end of the first fixing ring 3 close to the air cavity 4. An inner shunt ring groove 8 is installed along the connection between the first fixing ring 3 and the lip ring 2 where the air valve 7 is located. A sensor 10 with a probe 9 is installed at the connection between the air cavity 4 and the second fixing ring 5. The outer end of the probe 9 is flush with the surface of the air cavity 4. A front obliquely flowing annular air knife 11 is installed on one side of the lip ring 2 close to the seeker 1. The horizontal length of the front obliquely flowing annular air knife 11 is greater than the width of the air storage cavity 4. A gap is formed between the front obliquely flowing annular air knife 11 and the seeker 1.

[0017] In use, a front obliquely flowing annular air knife is arranged at the lip ring 2 at the front end of the probe. When measuring, the annular air knife enters the measured hole before the measuring head. The annular air curtain formed at the lip of the air knife contacts the wall of the measured hole to form a forward annular high-speed air flow to blow away the residual liquid and waste chips. The measuring head advances along the measuring direction to scan all the hole walls so that the measuring head can complete all measurements in an ideal environment and obtain perfect measurement results.

[0018] Preferably in this embodiment, the gap width between the front obliquely flowing annular air knife 11 and the seeker 1 is smaller than the width of the air storage cavity 4.

[0019] Setting the above structure makes the air flow channel gradually narrow, improving the measurement accuracy.

[0020] Preferably in this embodiment, an air gap adjustment pad 12 is arranged between the seeker 1 and the lip ring 2.

[0021] Setting the above structure, with the air gap adjustment pad 12, it can play the role of adjusting the gap between the seeker 1 and the lip ring 2, reducing the error caused by the gap in the detection jig.

[0022] Preferably in this embodiment, a plurality of air valves 7 are evenly arranged along the circumferential surface of the first fixing ring 3, and the plurality of air valves 7 are symmetrically arranged.

[0023] Setting the above structure, the evenly arranged air valves 7 can ensure the evenness of the air flow, and there will be no difference between the plurality of air valves 7, which is beneficial to the measurement quality.

[0024] Preferably in this embodiment, the sensor 10 is fixedly installed by bolts 13, and the bolts 13 are arranged at one end of the second fixing ring 5 away from the air cavity 4.

[0025] Set the above structure to ensure that the sensor 10 is fixed on the measuring head. The use of the bolt 13 ensures stability. In addition, it is set away from the sensor 10 to avoid damage caused by being too close to the probe 9.

[0026] Preferably in this embodiment, the first fixing ring 3 is in a "convex" shape, the second fixing ring 5 is in a "concave" shape, and the first fixing ring 3 and the second fixing ring 5 are arranged in cooperation with each other.

[0027] Set the above structure, and use the corresponding structure to ensure the precise cooperation between the first fixing ring 3 and the second fixing ring 5 during use.

[0028] Preferably in this embodiment, a triangular groove is provided on the first fixing ring 3, and a triangular protrusion is provided on one side of the second fixing ring 5 corresponding to the groove.

[0029] Set the above structure, the triangular groove cooperates with the triangular protrusion to ensure the clamping connection between the first fixing ring 3 and the second fixing ring 5 and prevent loosening at will.

[0030] The above embodiments are only illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A precision measuring head with an annular air knife, characterized in that, It includes a seeker (1), a lip ring (2), a first fixing ring (3), an air cavity (4) and a second fixing ring (5); the seeker (1), the lip ring (2), the first fixing ring (3), the air cavity (4) and the second fixing ring (5) are coaxially arranged and a guide shaft (6) is arranged on the central axis. An air cavity (4) is formed between the seeker (1) and the lip ring (2). An air valve (7) is installed at one end of the first fixing ring (3) close to the air cavity (4). An inner shunt ring groove (8) is installed along the connection between the first fixing ring (3) and the lip ring (2) where the air valve (7) is located. A sensor (10) with a probe (9) is installed at the connection between the air cavity (4) and the second fixing ring (5). The outer end of the probe (9) is flush with the surface of the air cavity (4). A front inclined flow annular air knife (11) is installed on one side of the lip ring (2) close to the seeker (1). The horizontal length of the front inclined flow annular air knife (11) is greater than the width of the air cavity (4). A gap is formed between the front inclined flow annular air knife (11) and the seeker (1). The width of the gap between the front inclined flow annular air knife (11) and the seeker (1) is less than the width of the air cavity (4). An air gap adjustment pad (12) is arranged between the seeker (1) and the lip ring (2). A plurality of the air valves (7) are evenly arranged along the circumferential surface of the first fixing ring (3), and the plurality of air valves (7) are symmetrically arranged. The sensor (10) is fixedly installed by bolts (13), and the bolts (13) are arranged at one end of the second fixing ring (5) away from the air cavity (4). The first fixing ring (3) is in a "convex" shape, the second fixing ring (5) is in a "concave" shape, and the first fixing ring (3) and the second fixing ring (5) are arranged in a matching manner. A triangular groove is arranged on the first fixing ring (3), and a triangular protrusion is arranged on one side of the second fixing ring (5) corresponding to the groove.

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