Aviation hydraulic oil filter shell weak point searching and measuring device and testing method thereof

Abstract

The invention relates to an aviation hydraulic oil filter shell weak point searching and measuring device and a testing method thereof. The measuring device comprises an L-shaped supporting arm and a dial indicator movable meter rod used for installing a digital display wide-range dial indicator. The standard inner hole leading-in device and the L-shaped supporting arm are connected into a whole, the adjusting gasket is additionally arranged on a stud of the standard inner hole leading-in device, and the dial indicator steel ball measuring head is screwed into the end portion of a movable indicator rod of the dial indicator. The method comprises the following steps: S1, zero calibration; s2, assembling is conducted; s3, displaying a table value; s4, performing regional measurement; s5, performing sliding measurement; s6, repeatedly measuring; according to the method, the upper shell weak point searching and measuring efficiency can be improved, the upper shell weak point searching and measuring is an important prevention means for avoiding the crack hidden danger of weak points caused by pressure impact in the product use process, and when the method is used in the aircraft manufacturing and repairing operation process, the product inspection efficiency can be improved, and the product quality can be improved; and the equipment perfectness ratio is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of weak point measurement technology for special-shaped housing parts of aviation hydraulic accessories, in particular to a device for finding and measuring weak points of an aviation hydraulic oil filter housing and a testing method thereof. Background Art

[0002] The function of aviation hydraulic high-pressure oil filter is to filter solid particles in the high-pressure pipeline of the hydraulic system during operation, prevent damage caused by pollutants in the system, and send out an indication signal when the system is polluted; the upper shell, as an important component of the high-pressure oil filter, carries the inflow of high-pressure oil before filtration and the outflow of high-pressure oil after filtration, providing a solid spatial barrier.

[0003] The upper shell is a casting, and the processing of the non-matching working surface outside the shell is relatively rough, causing the wall thickness to change with the shape of the outer surface of the shell; facing the same working environment, in the four weak point areas divided by the reinforcement ribs, the area with the smallest wall thickness will be broken first. When the parts are inspected for qualification after processing, it is necessary to measure and find the minimum wall thickness value, which is used to compare with the minimum wall thickness value of the design reserved safety margin. The comparison result finally determines whether the wall thickness of the part is qualified. The schematic diagram of the wall thickness and area of ​​the weak point is shown in Figure 1 and Figure 2 .

[0004] Therefore, in view of the inner and outer shapes and measurement requirements of the upper shell wall thickness, a method and device for finding and measuring the weak points of the upper shell is invented to meet the weak point finding and measurement of similar special-shaped shell parts, which is of great significance in the weak point finding and measurement process of aircraft special-shaped shell parts. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an aviation hydraulic oil filter housing weak point detection and measurement device and a testing method thereof.

[0006] A device for finding and measuring weak points of an aviation hydraulic oil filter housing comprises an L-shaped support arm and a dial indicator movable rod for installing a digital large-range dial indicator, a standard inner hole introducer connected to the L-shaped support arm, an adjustment gasket installed on the stud of the standard inner hole introducer, and a dial indicator steel ball probe screwed into the end of the dial indicator movable rod.

[0007] The mounting hole on the L-shaped support arm is inserted into the stud on the standard inner hole introducer and is fastened using a hexagonal locking nut.

[0008] A testing method for a weak point detection and measurement device for an aviation hydraulic oil filter housing, the specific steps of which are as follows:

[0009] S1. Zero calibration: After the zero calibration is completed, place the upper shell part to be tested with the inner hole of Φ75mm vertically upward; pull the dial indicator head so that the dial indicator movable rod drives the dial indicator steel ball probe to shrink and hold;

[0010] S2. Assembly: Hold the L-shaped support arm and shake the standard inner hole introducer into the Φ75mm inner hole of the upper shell. Gently place the dial indicator head so that the dial indicator movable rod can be extended and retracted to drive the dial indicator steel ball probe to contact the outer wall of the weak point area of ​​the upper shell;

[0011] S3. Display the table value: Move the L-shaped support arm to make the dial gauge steel ball probe slide on the outer wall surface of the weak point area of ​​the upper shell, and observe the value of the digital large-scale dial gauge in real time. The point where the dial shows the minimum value is the weak point of the upper shell in the measurement area;

[0012] S4, measurement by area: the outer surface of the upper shell is divided into 4 areas by the reinforcement ribs. When measuring the next area after measuring one area, pull the dial indicator head to shrink the dial indicator movable rod and the dial indicator steel ball probe to a sufficient distance;

[0013] S5. Sliding measurement: Gently place the dial indicator head so that the dial indicator movable rod and the dial indicator steel ball probe assembly extend out to contact the outer wall of the upper shell in the area, move the L-shaped arm to make the dial indicator steel ball probe slide on the outer wall of the upper shell, and observe the value of the digital large-range dial indicator in real time;

[0014] S6. Repeat measurement: Repeat the measurement of the four upper shell outer wall areas to obtain the weak point values ​​of the upper shell in the four areas. The minimum value is compared with the minimum wall thickness value of 4.23mm reserved for the design safety margin to directly determine whether the thickness of the weak point of the upper shell is qualified.

[0015] The beneficial effects of the present invention are as follows: the present invention has a simple structure, is convenient and flexible to use, and can greatly improve the efficiency of finding and measuring weak points in the upper shell. Finding and measuring weak points in the upper shell is an important preventive measure to avoid hidden dangers of cracks at weak points due to pressure shock during product use. Using the present invention in the process of aircraft manufacturing and repair operations can improve product inspection efficiency, improve product quality, and ensure equipment integrity. It has broad application prospects and has significant military, economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the weak point wall thickness structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the weak point wall thickness area structure of the present invention;

[0019] Figure 3It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure numerals: 1. Standard inner hole introducer; 2. L-shaped support arm; 3. Hexagonal locking nut; 4. Locking flower nut; 5. Digital large-range dial indicator; 6. Dial indicator steel ball probe; 7. Dial indicator head; 8. Dial indicator fixed stem; 9. Dial indicator movable stem; 10. Dial indicator zeroing key; 11. Adjustment gasket; 12. Dial stem mounting hole. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0022] like Figures 1 to 3 As shown, a device for finding and measuring weak points of an aviation hydraulic oil filter housing includes an L-shaped support arm 2 and a dial indicator movable rod 9 for installing a digital large-range dial indicator 5, and also includes a standard inner hole introducer 1 connected to the L-shaped support arm 2, an adjustment gasket 11 installed on the stud of the standard inner hole introducer 1, and a dial indicator steel ball probe 6 screwed into the end of the dial indicator movable rod 9.

[0023] The present invention has a simple structure, is convenient and flexible to use, and can greatly improve the efficiency of finding and measuring the weak points of the upper shell. Finding and measuring the weak points of the upper shell is an important preventive measure to avoid the hidden danger of cracks at the weak points caused by pressure shock during product use. Using the present invention in the process of aircraft manufacturing and repair operations can improve product inspection efficiency, improve product quality, and ensure the integrity rate of equipment. It has broad application prospects and has significant military, economic and social benefits.

[0024] After adding the adjusting gasket 11, it is ensured that the U-shaped space formed by the L-shaped support arm 2 and the standard inner hole introducer 1 being integrated can meet the full stroke free movement of the standard inner hole introducer 1 in the Φ75mm hole of the upper shell.

[0025] The mounting hole on the L-shaped support arm 2 is inserted into the stud on the standard inner hole introducer 1 and fastened with the hexagonal locking nut 3. The structure of the standard inner hole introducer 1 is used as the inner wall reference, and it can be designed according to the shape of the inner wall of the measured part. It has strong adaptability. The head support frame using the L-shaped support arm 2 structure can change the length of the two arms to meet the requirements of avoiding the interference space of the parts to meet the use requirements. The L-shaped support arm 2 and the standard inner hole introducer 1 are combined to form a standard ruler body structure for measuring the wall thickness of the special-shaped shell.

[0026] A method for relatively measuring wall thickness by using a standard inner hole introducer 1 structure as an inner wall reference, a gauge support frame with an L-shaped arm 2 structure, and a digital large-range dial gauge 5 assembly

[0027] The dial indicator movable rod 9 and the dial indicator steel ball probe 6 pass through the rod mounting hole 12 of the L-shaped support arm 2, and are fastened by locking the flower nut 4 after the dial indicator fixed rod 8 passes through the lower end surface of the rod mounting hole 12.

[0028] The dial indicator fixing rod 8 passes through the length of the lower end surface of the rod mounting hole 12 so that the dial indicator steel ball probe 6 contacts the cylindrical surface of the standard inner hole introducer 1. When the digital large-range dial indicator 5 is observed to have a pre-compression value, the locking flower nut 4 is tightened and the dial indicator zero key 10 is pressed so that the dial of the digital large-range dial indicator 5 displays a value of 0.00mm.

[0029] The digital large-range dial gauge 5 is reset by pulling the dial gauge head 7, and the zero calibration is completed when the value displayed on the dial of the digital large-range dial gauge 5 is observed to be stable at 0.00mm.

[0030] The digital large-scale dial gauge 5 is provided with a dial gauge zeroing key 10 for returning the dial to zero. After adjustment and debugging during the first use, the subsequent use only requires turning on the digital large-scale dial gauge 5, slightly pulling the dial gauge head 7 over the full range to reset the dial gauge to zero, and then the dial gauge can be used directly.

[0031] A testing method for a weak point detection and measurement device for an aviation hydraulic oil filter housing, the specific steps of which are as follows:

[0032] S1. Zero calibration: After the zero calibration is completed, place the upper shell part to be measured with the inner hole of Φ75mm vertically upward; gently pull the dial indicator head 7 so that the dial indicator movable rod 9 drives the dial indicator steel ball probe 6 to shrink and hold;

[0033] S2. Assembly: Hold the L-shaped arm 2 and gently shake the standard inner hole introducer 1 into the Φ75mm inner hole of the upper shell. Gently place the dial indicator head 7 to allow the dial indicator movable rod 9 to extend and retract to drive the dial indicator steel ball probe 6 to contact the outer wall of the weak point area of ​​the upper shell;

[0034] S3, display the table value: slowly and freely move the L-shaped support arm 2 to make the dial gauge steel ball probe 6 slide on the outer wall surface of the weak point area of ​​the upper shell, and observe the dial value of the digital large-scale dial gauge 5 in real time. The point where the dial shows the minimum value is the weak point of the upper shell in the measurement area;

[0035] S4, measurement by area: the outer surface of the upper shell is divided into 4 areas by the reinforcement ribs. When measuring the next area after measuring one area, it is necessary to gently pull the dial indicator head 7 to shrink the dial indicator movable rod 9 and the dial indicator steel ball probe 6 by a sufficient distance to avoid collision when rotating the L-shaped support arm 2 to enter the next area;

[0036] S5, sliding measurement: gently put down the dial indicator head 7 so that the dial indicator movable table rod 9 and the dial indicator steel ball probe 6 assembly extend out to contact the outer wall of the upper shell in this area, slowly and freely move the L-shaped arm 2 to make the dial indicator steel ball probe 6 slide on the outer wall of the upper shell, and observe the dial value of the digital large-range dial indicator 5 in real time;

[0037] S6. Repeat measurement: Repeat the measurement of the four upper shell outer wall areas to obtain the weak point values ​​of the upper shell in the four areas. The minimum value is compared with the minimum wall thickness value of 4.23mm reserved for the design safety margin. This can directly determine whether the thickness of the weak point of the upper shell is qualified.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for finding and measuring weak points of an aviation hydraulic oil filter housing, comprising an L-shaped support arm (2) and a dial indicator movable rod (9) for mounting a digital large-range dial indicator (5), characterized in that: It also includes a standard inner hole introducer (1) connected to the L-shaped support arm (2), an adjustment gasket (11) installed on the stud of the standard inner hole introducer (1), and a dial indicator steel ball probe (6) screwed into the end of the dial indicator movable rod (9); the stud on the standard inner hole introducer (1) is inserted into the mounting hole on the L-shaped support arm (2) and fastened using a hexagonal locking nut (3).

2. The device for finding and measuring weak points of an aviation hydraulic oil filter housing according to claim 1, characterized in that: The dial indicator movable rod (9) and the dial indicator steel ball probe (6) pass through the rod mounting hole (12) of the L-shaped support arm (2), and are fastened by a locking flower nut (4) after the dial indicator fixed rod (8) passes through the lower end surface of the rod mounting hole (12).

3. The device for finding and measuring weak points of an aviation hydraulic oil filter housing according to claim 2, characterized in that: The dial gauge fixed rod (8) passes through the lower end surface of the rod mounting hole (12) to a length such that the dial gauge steel ball probe (6) contacts the cylindrical surface of the standard inner hole introducer (1).

4. The device for finding and measuring weak points of an aviation hydraulic oil filter housing according to claim 1, characterized in that: The digital large-range dial gauge (5) is reset by pulling the dial gauge head (7).

5. The device for finding and measuring weak points of an aviation hydraulic oil filter housing according to claim 1, characterized in that: The digital large-range dial gauge (5) is provided with a dial gauge zeroing key (10) for returning the dial to zero.

6. A testing method using the weak point finding and measuring device for an aviation hydraulic oil filter housing according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: S1. Zero calibration: After the zero calibration is completed, place the upper housing part to be measured with the inner hole of Φ75 mm vertically upward; pull the dial gauge head (7) so that the dial gauge movable rod (9) drives the dial gauge steel ball probe (6) to contract and hold; S2. Assembly: Hold the L-shaped support arm (2) and shake the standard inner hole introducer (1) into the Φ75mm inner hole of the upper shell. Gently place the dial indicator head (7) to allow the dial indicator movable rod (9) to extend and retract to drive the dial indicator steel ball probe (6) to contact the outer wall of the weak point area of ​​the upper shell. S3, displaying the meter value: moving the L-shaped support arm (2) to make the dial gauge steel ball probe (6) slide on the outer wall surface of the weak point area of ​​the upper shell, and observing the dial value of the digital large-range dial gauge (5) in real time. The point where the dial shows the minimum value is the weak point of the upper shell in the measurement area; S4, measurement by area: the outer surface of the upper shell is divided into four areas by the reinforcing ribs. When measuring one area and then measuring the next area, pull the dial indicator head (7) to shrink the dial indicator movable rod (9) and the dial indicator steel ball probe (6) to a sufficient distance; S5, sliding measurement: gently place the dial indicator head (7) so that the dial indicator movable rod (9) and the dial indicator steel ball probe (6) assembly extend to contact the outer wall of the upper shell in the area, move the L-shaped support arm (2) to make the dial indicator steel ball probe (6) slide on the outer wall of the upper shell, and observe the dial value of the digital large-range dial indicator (5) in real time; S6. Repeat measurement: Repeat the measurement of the four upper shell outer wall areas to obtain the weak point values ​​of the upper shell in the four areas. The minimum value is compared with the minimum wall thickness value of 4.23mm reserved for the design safety margin to directly determine whether the thickness of the weak point of the upper shell is qualified.

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