CN114199107A - Device and method for detecting wall thickness of cylinder of piston type aero-engine - Google Patents
Device and method for detecting wall thickness of cylinder of piston type aero-engine Download PDFInfo
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- CN114199107A CN114199107A CN202111520564.4A CN202111520564A CN114199107A CN 114199107 A CN114199107 A CN 114199107A CN 202111520564 A CN202111520564 A CN 202111520564A CN 114199107 A CN114199107 A CN 114199107A
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- 229910000831 Steel Inorganic materials 0.000 claims description 4
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- 238000003754 machining Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The application discloses piston aeroengine cylinder wall thickness detection device and method, the device shown includes: a vernier caliper; the movable long clamping foot is movably arranged on the movable clamping foot of the vernier caliper in a sliding fit manner, and the tail end of the movable long clamping foot is provided with a ball head which is tangent to the circumferential arc of the inner wall of the appointed part of the exhaust passage during measurement; the fixed long clamping foot is fixedly arranged on the fixed clamping foot of the vernier caliper, and the tail end of the fixed long clamping foot is provided with a measuring rod which props against the circumferential arc of the outer wall of the designated part of the exhaust passage during measurement; and the positioning device is matched with the movable long clamping pin and the fixed long clamping pin and is used for limiting the angular position of the movable clamping pin and the depth of the movable clamping pin penetrating into the exhaust passage. The method and the device have the advantages of simplicity, rapidness, accurate positioning, easiness in mastering, lower cost, high flexibility and wide application, can realize rapid detection of the wall thickness of the engine exhaust passage, and can timely find and eliminate potential safety hazards.
Description
Technical Field
The application relates to the technical field of mechanical measurement, in particular to a device and a method for detecting the wall thickness of a cylinder of a piston type aero-engine.
Background
The air-cooled cylinder of the aviation piston engine comprises parts such as a cylinder head cast by aluminum alloy, a cylinder barrel made of steel and the like, an air inlet channel 7 and an air outlet channel 8 on the cylinder head are formed by combined casting of a metal blade mould and a sand core, the wall thickness of the air inlet channel and the air outlet channel is ensured by a profiling mould, and the wall thickness of the cylinder is generally not required to be checked in finished product inspection. The wall thickness of the exhaust passage 8 of each cylinder is unqualified due to the deviation of the casting sand core, and the strength of the exhaust passage part of the cylinder head is influenced, as shown in figure 1. Through stress analysis and calculation, the thermal stress of the exhaust passage is relatively large, the weak position of the structure and the position where the stress is most concentrated are the parting surface positions (the parting surface is the split position of a split mold) between the 10 th radiating fins and the 11 th radiating fins 10 of the exhaust passage, and the thickness of the part meets the requirement, so that the strength of the wall of the exhaust passage can be ensured to be sufficient, and the crack 9 is avoided. Because the inner profile of the exhaust passage is irregular, and radiating fins are cast outside, the measurement cannot be carried out by adopting a conventional measuring tool; the thickness measuring instrument equipment such as ultrasonic waves and lasers cannot be adopted for measurement due to the interference of the radiating fins; currently, industrial CT scanning is adopted for measurement. The industrial CT machine is a fixed detection device in a factory, is inconvenient to carry or transport, and cannot realize in-situ inspection of the working site of the engine. The industrial CT scanning detection cost is high, the efficiency is low, the period is long, the detection time is about 2-3 hours, and currently, no better detection means and method are available for measurement at home.
Disclosure of Invention
The application provides a piston aeroengine cylinder wall thickness detection device on the one hand to solve the technical problem that current piston aeroengine cylinder wall thickness detects with high costs, inefficiency, cycle length.
The technical scheme adopted by the application is as follows:
the utility model provides a piston aeroengine cylinder wall thickness detection device, includes:
a vernier caliper;
the movable long clamping foot is movably arranged on the movable clamping foot of the vernier caliper in a sliding fit manner, the tail end of the movable long clamping foot is provided with a ball head which is tangent to a circumferential arc of the inner wall of the appointed part of the exhaust passage during measurement, and the appointed part is the part of the wall thickness of the exhaust passage to be measured; when the two ends are tangent, the circle center of the ball head, the circle center of the circumferential arc of the inner wall of the designated part and the tangent point are positioned on the same straight line;
the measuring rod and the measuring point of the circumferential arc of the outer wall of the designated part of the exhaust passage are positioned on the same straight line with the center of the ball head and the center of the circumferential arc of the inner wall of the designated part and the tangent point;
and the positioning device is matched with the movable long clamping pin and the fixed long clamping pin and is used for limiting the angular position of the movable clamping pin and the depth of the movable clamping pin penetrating into the exhaust passage.
Further, the fixed long clamp foot is fixed on the fixed clamp foot of the vernier caliper according to a preset angle, and the fixed long clamp foot is determined according to the profile of the exhaust passage according to the preset angle.
Further, the measuring rod is detachably arranged on the fixed long clamping foot through a nut and is parallel to a radiating fin on the outer wall of the engine cylinder.
Furthermore, one end of the measuring rod, which faces the exhaust passage measuring point, is a conical shaft.
Furthermore, the positioning device comprises a bolt which is arranged on the fixed long clamping pin and inserted between the radiating fins on the outer wall of the engine cylinder, and the bolt is used for limiting the swing amplitude of the fixed long clamping pin between the radiating fins and ensuring the accuracy of measurement.
Furthermore, the positioning device further comprises a positioning ring, wherein the positioning ring is detachably arranged on the end face of the exhaust port and is matched with the movable long clamping foot to quickly limit the angular position of the movable long clamping foot and the depth position of the exhaust passage.
Furthermore, the locating ring comprises an annular main body connected with the end face of the exhaust port through a fixing bolt, and a clamping pin limiting nail arranged on the annular main body at a certain elevation angle and used for limiting the angular position of the movable long clamping pin, wherein a depth locating surface matched with the upper end face of the annular main body and used for limiting the depth position of the movable long clamping pin inserted into the exhaust passage is arranged on the movable long clamping pin.
Furthermore, a scribed line pointer for determining the angular position of the clamping pin limiting nail is further arranged on the annular main body.
Further, the movable long clamping pin, the fixed long clamping pin and the measuring rod are made of 65Mn steel.
The application further provides a method for detecting the wall thickness of the cylinder of the piston type aircraft engine, and based on the device, the method comprises the following steps:
checking a caliper tool assembly and calibrating a zero position;
sleeving a positioning ring on the end face of the exhaust port, rotating the positioning ring to enable the scribing pointer to be aligned to the center of a fastening screw of the rocker chamber cover, screwing a fixing bolt on the positioning ring, and fixing the positioning ring on the end face of the exhaust port;
opening a movable long clamping pin and a fixed long clamping pin of the vernier caliper, inserting the movable long clamping pin into an exhaust port, meanwhile, horizontally pushing a measuring rod of the fixed long clamping pin into the space between the radiating fins along the radiating fin groove, gradually drawing the movable long clamping pin and the fixed long clamping pin in the process, enabling the movable long clamping pin and the fixed long clamping pin to freely enter the space between the exhaust passage and the radiating fins, and shaking to enable the front end of the measuring rod to be attached to a measuring point of a circumferential arc of the outer wall of the designated position of the exhaust passage;
when the depth positioning surface of the movable long clamping pin is close to the positioning ring, the inserted pin is inserted into the space between the radiating fins to a position where the inserted pin cannot be pushed;
the movable long clamping foot is leaned against the clamping foot limiting nail on the positioning ring;
the movable long clamping pin is contracted until the ball head is contacted with the inner cavity of the exhaust passage, so that the ball head is attached to the measuring point of the circumferential arc of the inner wall of the exhaust passage;
and reading data from the vernier caliper and recording to obtain the wall thickness value of the exhaust passage.
Compared with the prior art, the method has the following beneficial effects:
(1) the method and the device are simple and quick, accurate in positioning, easy to master and low in cost.
(2) The wall thickness of the exhaust passage is checked in situ, the working efficiency is improved, and the detection period is shortened.
(3) The device and the detection method can be used for realizing the work of the wall thickness of the engine exhaust passage, and discovering and eliminating potential safety hazards in time.
(4) The device can be widely applied to the inspection process procedures of parts such as the wall thickness of the exhaust passage and the like which are inconvenient to directly detect.
(5) The thickness detection of other spare part non-regular position is popularized and applied to modes such as fixed long calorie of foot of this application accessible adjustment and the long calorie of foot shape of activity, change holding ring locating pin angular position.
(5) The wall thickness value that the device of this application surveyed carries out the comparative test with the wall thickness value that industry CT surveyed, and the difference can be controlled within 0.1mm, satisfies the requirement of wall thickness tolerance 0.75 mm.
In addition to the objects, features and advantages described above, other objects, features and advantages will be apparent from the present application. The present application will now be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a crack fault location and internal structure of an aircraft engine cylinder.
FIG. 2 is a schematic structural diagram of a piston type aircraft engine cylinder wall thickness detection device (without a positioning ring) according to a preferred embodiment of the application.
Fig. 3 is a perspective view of the fixing long clip of the preferred embodiment of the present application.
Fig. 4 is a schematic diagram of measuring wall thickness.
FIG. 5 is a diagrammatic, schematic illustration of the measurement of wall thickness at a given depth in accordance with a preferred embodiment of the present application.
FIG. 6 is a schematic front view of a measuring staff of the preferred embodiment of the present application.
FIG. 7 is a schematic front view of the latch of the preferred embodiment of the present application.
FIG. 8 is a front view of a retaining ring according to the preferred embodiment of the present application.
Fig. 9 is a schematic sectional view taken along line a-a in fig. 8.
Fig. 10 is a front view of the active long card foot according to the preferred embodiment of the present application.
Fig. 11 is a schematic sectional view taken along line a-a in fig. 10.
In the figure: 1. a vernier caliper; 2. a movable long clamping pin; 21. a depth positioning surface; 22. a ball head; 3. a bolt; 4. fixing the long clamping pin; 5. a measuring rod; 6. a positioning ring; 61. an annular body; 62. a foot clamping limit nail; 63. marking a pointer; 7. an air inlet channel; 8. an exhaust passage; 9. cracking; 10. and a heat sink.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 2, the preferred embodiment of the present application provides a cylinder wall thickness detection device for a piston type aircraft engine, which comprises a vernier caliper 1, a movable long clamping foot 2, a fixed long clamping foot 4 and a positioning device, wherein,
the movable long clamping leg 2 is movably arranged on the movable clamping leg of the vernier caliper in a sliding fit manner, the tail end of the movable long clamping leg 2 is provided with a ball head 22 tangent to a circumferential arc of the inner wall of the appointed part of the exhaust passage during measurement, and the appointed part is the part of the wall thickness of the exhaust passage to be measured; when the two parts are tangent, the circle center of the ball head 22, the circle center of the circumferential arc of the inner wall of the designated part and the tangent point are positioned on the same straight line; the diameter of the ball head is phi 12mm, the angular direction of the radius of the ball head 22 is designed to be coincident with the radius of the designated part of the circumferential arc of the exhaust passage, and the angular direction is used as a measuring tangent point, and the error caused by the unevenness in the exhaust passage can be corrected by selecting the ball head.
The fixed long clamping foot 4 (shown in figure 3) is fixedly arranged on the fixed clamping foot of the vernier caliper, the tail end of the fixed long clamping foot 4 is provided with a measuring rod 5 which props against the circumferential arc of the outer wall of the appointed part of the exhaust passage during measurement, and the measuring rod 5 and the measuring point of the circumferential arc of the outer wall of the appointed part of the exhaust passage are positioned on the same straight line with the circle center of the ball head and the circle center and the tangent point of the circumferential arc of the inner wall of the appointed part;
the positioning device is matched with the movable long clamping pin 2 and the fixed long clamping pin 4 and is used for limiting the angular position of the movable clamping pin and the depth of the movable clamping pin penetrating into the exhaust passage.
According to the modeling of the air passage molded surface, the device specially used for measuring the wall thickness of the exhaust passage is designed and manufactured, the measurement precision is ensured, and the working principle of the embodiment is as follows:
as shown in fig. 4 and 5, the shortest distance from a point C outside the circle to the circle is the distance between a point B intersecting the circle and a point C outside the circle, connecting the point C outside the circle with the center a of the circle, the wall thickness of the exhaust duct can be regarded as the distance between a given part circle and a point outside the circle, according to which principle, two movable long clamping feet 2 and fixed long clamping feet 4 with corresponding angles and lengths are fixed on two clamping feet of the vernier caliper, the angular position of the movable long clamping foot 2 and the depth of the movable long clamping foot 2 penetrating into the exhaust passage are fixed by a positioning device, a ball head of the movable long clamping foot 2 props against the inner wall of a circumferential arc at a specified depth position, so that the extension line of the radius of the ball head of the movable long clamping foot 2 passes through the center of the exhaust passage, the radius of the ball head is designed to be superposed with the radius of a specified part of the circumferential arc of the exhaust passage, namely, the circle center of the ball head, the circle center of the circumferential arc of the inner wall of the designated part and the tangent point are positioned on the same straight line; the measuring rod 5 of the fixed long clamping pin 4 is propped against one point of the outer wall of the circumferential arc, and the distance between the movable long clamping pin 2 and the fixed long clamping pin 4 is the wall thickness between the inner wall and the outer wall of the exhaust passage.
The piston type aero-engine cylinder wall thickness detection device provided by the embodiment is simple and rapid, accurate in positioning, easy to master, low in cost and convenient and rapid to operate, achieves in-situ inspection of the exhaust passage wall thickness, improves the working efficiency, shortens the detection period, achieves rapid measurement of the engine exhaust passage wall thickness, and timely finds and eliminates potential safety hazards.
In addition, the thickness detection method can be popularized and applied to thickness detection of irregular parts of other components in ways of adjusting the shapes of the fixed long clamping pin and the movable long clamping pin, changing the angular positions of the positioning ring positioning pins and the like. The wall thickness value measured by the device of the embodiment and the wall thickness value measured by the industrial CT are compared and tested, and the difference value can be controlled within +/-0.1 mm, so that the requirement of wall thickness tolerance +/-0.75 mm is met.
The fixed long clamp foot 4 is fixed on a fixed clamp foot of the vernier caliper according to a preset angle (see figure 3), and the fixed long clamp foot is determined according to the profile of the exhaust passage according to the preset angle.
In the preferred embodiment of the present application, as shown in fig. 2 and 6, the measuring rod 5 is detachably mounted on the fixed long clip 4 by a nut and is parallel to the heat sink 10 of the outer wall of the engine cylinder. And one end of the measuring rod 5 facing the exhaust passage measuring point is a conical shaft. In this embodiment, the measuring bar 5 is fixed to the fixed long clamp 4 by a double nut, inserted into a groove between adjacent heat sinks 10, and parallel to the heat sinks 10, and used as one of the measurement references. Because the clearance between the fin 10 is only 2 ~ 3mm, and irregular, so the measuring staff 5 adopts from the afterbody with the toper and the cascaded form that contracts to the end in order to improve intensity, the end of measuring staff has multiple size, can select the measuring staff of different sizes according to the clearance between 10 th, 11 th fin 10. The measuring rod 5 is detachable and fixed through double nuts, and is convenient to replace.
In the preferred embodiment of the present application, as shown in fig. 2 and 7, the positioning device includes a pin 3 inserted between the fins 10 of the outer wall of the engine cylinder and fixed to the long bayonet 4, for limiting the swing of the fixed long bayonet 4 between the 10 th and 11 th fins 10, and ensuring the accuracy of the measurement.
In the preferred embodiment of the present application, as shown in fig. 8 and 9, the positioning device further comprises a positioning ring 6, wherein the positioning ring 6 is detachably disposed on the end surface of the exhaust port, and cooperates with the movable long clamping leg 2 to quickly limit the angular position of the movable long clamping leg 2 and the depth position of the exhaust passage 8. The positioning ring 6 comprises an annular main body 61 connected with the end face of the exhaust port through a fixing bolt, and a clamping pin limiting nail 62 arranged on the annular main body 61 at a certain elevation angle and used for limiting the angular position of the movable long clamping pin 2, wherein a depth positioning surface 21 (shown in fig. 10 and 11) matched with the upper end face of the annular main body 61 and used for limiting the depth position of the movable long clamping pin 2 inserted into the exhaust passage is arranged on the movable long clamping pin 2. The annular body 61 is also provided with a scribed line pointer 63 for determining the angular position of the clamping pin limit pin 62.
The positioning ring 6 is arranged on the end face of the exhaust port, positioning is carried out by machining end faces (machining coordinate system) such as the exhaust port, the angular position of the clamping pin limiting nail 62 is determined by the reticle pointer 63, support is provided for the movable long clamping pin 2, the insertion depth of the movable long clamping pin 2 is limited, and accurate positioning is achieved.
The scribed line pointer 63 on the upper end surface of the annular main body 61 is aligned with the center of the stud outside the exhaust port to determine the angular position of the clamping pin limit nail 62, and the back of the movable long clamping pin 2 is supported on the clamping pin limit nail 62 to ensure the angular position precision of the movable long clamping pin 2. The thickness of the annular main body 61 is designed, so that the inner end face of the annular main body 61 can be attached to the end face of the exhaust port, the depth from the outer end face to the specified measurement position of the exhaust passage is the length from the depth positioning face 21 of the movable long clamping pin 2 to the center of the ball head 22, namely the depth positioning face 21 of the movable long clamping pin 2 is in contact with the outer end face of the annular main body 61, and the rapid positioning in the depth direction of the movable long clamping pin 2 can be realized. The device of the embodiment determines the installation position of the positioning ring 6 by the scribed line pointer 63, and the positioning ring 6 can quickly position the insertion depth and the angular position of the movable long clamping foot 2, so that the measurement work can be completed within a few minutes.
In the preferred embodiment of the application, the material of the movable long clamping foot 2, the fixed long clamping foot 4 and the measuring rod 5 is 65Mn steel, so that the wear resistance and the corrosion resistance are better, and the service life and the reliability of the device can be improved.
Another preferred embodiment of the present application provides a method for detecting the wall thickness of a cylinder of a piston type aircraft engine, which is based on the device and comprises the following steps:
s1, checking the caliper tool assembly, and calibrating a zero position;
s2, sleeving the positioning ring 6 on the end face of the exhaust port, rotating the positioning ring 6 to enable the reticle pointer 63 to align to the center of a fastening screw of the rocker cover, screwing a fixing bolt on the positioning ring 6, and fixing the positioning ring 6 on the end face of the exhaust port 8;
s3, opening the movable long clamping leg 2 and the fixed long clamping leg 4 of the vernier caliper 1, inserting the movable long clamping leg 2 into an exhaust port, meanwhile, horizontally pushing the measuring rod 5 of the fixed long clamping leg 4 into the radiating fins along the grooves of the radiating fins 10, gradually drawing the movable long clamping leg 2 and the fixed long clamping leg 4 in the process, enabling the movable long clamping leg 2 and the fixed long clamping leg 4 to freely enter the space between the exhaust passage and the radiating fins 10, and shaking to enable the front end of the measuring rod 5 to be attached to the measuring point of the circumferential arc of the outer wall of the designated part of the exhaust passage;
s4, after the depth positioning surface 21 of the movable long clamping leg 2 is close to the positioning ring 6, the bolt 3 is inserted into the heat radiating fins 10 to a position where the bolt cannot be pushed, a shaft shoulder is arranged at the front end of the bolt 3, and in the inserting process, the bolt 3 stops being inserted when the shaft shoulder is close to the heat radiating fins 10;
s5, the movable long clamping leg 2 is leaned against the clamping leg limit nail 62 on the positioning ring 6;
s6, contracting the movable long clamping leg 2 until the ball head 22 contacts with the inner cavity of the exhaust passage 8, so that the ball head 22 is attached to the measuring point of the circumferential arc of the inner wall of the exhaust passage 8;
and S7, reading the data from the vernier caliper 1 and recording the data to obtain the wall thickness value of the exhaust passage.
The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. The utility model provides a piston aeroengine cylinder wall thickness detection device, includes:
a vernier caliper (1);
the movable long clamping foot (2) is movably arranged on the movable clamping foot of the vernier caliper in a sliding fit manner, the tail end of the movable long clamping foot (2) is provided with a ball head which is tangent to a circumferential arc of the inner wall of the appointed part of the exhaust passage during measurement, and the appointed part is the part of the wall thickness of the exhaust passage to be measured; when the two ends are tangent, the circle center of the ball head, the circle center of the circumferential arc of the inner wall of the designated part and the tangent point are positioned on the same straight line;
the measuring device comprises a fixed long clamping foot (4) which is fixedly arranged on the fixed clamping foot of the vernier caliper, the tail end of the fixed long clamping foot (4) is provided with a measuring rod (5) which is used for propping against the circumferential arc of the outer wall of the appointed part of the exhaust passage during measurement, and the measuring points of the measuring rod (5) and the circumferential arc of the outer wall of the appointed part of the exhaust passage and the circle center of the ball head and the circle center and tangent point of the circumferential arc of the inner wall of the appointed part are positioned on the same straight line;
and the positioning device is matched with the movable long clamping pin (2) and the fixed long clamping pin (4) and is used for limiting the angular position of the movable clamping pin and the depth of penetrating into the exhaust passage.
2. The device according to claim 1, characterized in that the fixed long bayonet (4) is fixed on the fixed bayonet of the vernier caliper at a preset angle, which is determined according to the profile of the vent channel.
3. The device according to claim 1, characterized in that the measuring rod (5) is detachably arranged on the fixed long clamping foot (4) through a nut and is parallel to a cooling fin (10) of the outer wall of the engine cylinder.
4. The apparatus of claim 1,
one end of the measuring rod (5) facing the exhaust passage measuring point is a conical shaft.
5. The device according to claim 1, characterized in that the positioning means comprise pins (3) on the fixed long bayonet legs (4) and inserted between the cooling fins (10) of the outer wall of the engine cylinder, for limiting the amplitude of the fixed long bayonet legs (4) between the cooling fins (10).
6. The device according to any one of claims 1 to 5, characterized in that the positioning device further comprises a positioning ring (6), wherein the positioning ring (6) is detachably arranged on the end surface of the exhaust port and is matched with the movable long clamping leg (2) to rapidly limit the angular position of the movable long clamping leg (2) and the depth position of the exhaust passage.
7. The device according to claim 6, characterized in that the positioning ring (6) comprises an annular main body (61) connected with the end face of the exhaust port through a fixing bolt, and a clamping pin limiting nail (62) arranged on the annular main body (61) at a certain elevation angle and used for limiting the angular position of the movable long clamping pin (2), wherein a depth positioning surface (21) matched with the upper end face of the annular main body (61) and used for limiting the depth position of the movable long clamping pin (2) inserted into the exhaust passage is arranged on the movable long clamping pin (2).
8. Device according to claim 7, characterized in that the annular body (61) is also provided with a scoring pointer (63) for determining the angular position of the jamming retaining pin (62).
9. The device according to claim 1, characterized in that the material of the movable long clamping foot (2), the fixed long clamping foot (4) and the measuring rod (5) is 65Mn steel.
10. A method for detecting the wall thickness of a cylinder of a piston type aero-engine is characterized by comprising the following steps:
checking a caliper tool assembly and calibrating a zero position;
sleeving a positioning ring (6) on the end face of the exhaust port, rotating the positioning ring (6) to enable a scribing pointer (63) to be aligned to the center of a fastening screw of the rocker chamber cover, screwing a fixing bolt on the positioning ring (6), and fixing the positioning ring (6) on the end face of the exhaust port (8);
opening a movable long clamping pin (2) and a fixed long clamping pin (4) of the vernier caliper (1), inserting the movable long clamping pin (2) into an exhaust port, and meanwhile, horizontally pushing a measuring rod (5) of the fixed long clamping pin (4) into the space between the radiating fins along the grooves of the radiating fins (10), gradually drawing the movable long clamping pin (2) and the fixed long clamping pin (4) in the process, so that the movable long clamping pin (2) and the fixed long clamping pin (4) can freely enter the space between the exhaust passage and the radiating fins (10), and shaking to attach the front end of the measuring rod (5) to a measuring point of a circumferential arc on the outer wall of the designated part of the exhaust passage;
when the depth positioning surface of the movable long clamping leg (2) is close to the positioning ring (6), the bolt (3) is inserted into the space between the radiating fins (10) to a position where the bolt cannot be pushed;
the movable long clamping leg (2) is leaned against the clamping leg limit nail (62) on the positioning ring (6);
the movable long clamping pin (2) is contracted until the ball head is contacted with the inner cavity of the exhaust passage, so that the ball head is attached to the measuring point of the circumferential arc of the inner wall of the exhaust passage;
and reading data from the vernier caliper and recording to obtain the wall thickness value of the exhaust passage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111520564.4A CN114199107A (en) | 2021-12-13 | 2021-12-13 | Device and method for detecting wall thickness of cylinder of piston type aero-engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111520564.4A CN114199107A (en) | 2021-12-13 | 2021-12-13 | Device and method for detecting wall thickness of cylinder of piston type aero-engine |
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| CN212300198U (en) * | 2020-07-14 | 2021-01-05 | 佛山市大拓玻璃机械有限公司 | Glass residual thickness auxiliary measuring device |
| CN215064236U (en) * | 2021-07-06 | 2021-12-07 | 宁波拓普集团股份有限公司 | Utensil is examined to automotive suspension ball round pin centre of sphere height |
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| CN103292665A (en) * | 2013-06-24 | 2013-09-11 | 国家电网公司 | Method and corresponding device for measuring cable insulation thickness and eccentricity |
| CN107063049A (en) * | 2017-06-30 | 2017-08-18 | 青岛兰石重型机械设备有限公司 | A kind of annular groove central diameter survey tool and its application method |
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| CN212300198U (en) * | 2020-07-14 | 2021-01-05 | 佛山市大拓玻璃机械有限公司 | Glass residual thickness auxiliary measuring device |
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