Testing equipment and method for sealing device at leading-out position of steel wire rope

Abstract

The invention relates to the field of aircraft control systems, in particular to a testing device and method for a sealing device at the leading-out position of a steel wire rope, and the testing device comprises a water tank, an airtight cylinder and a sealing device plug. The water tank and the airtight cylinder are fixedly and hermetically connected together through a sealing device plug; the airtight cylinder is used for simulating an airtight area on an airplane, and the water tank is used for simulating a non-airtight area on the airplane; a to-be-tested sealing device is installed on the left end face of the sealing device plug, a steel wire rope sleeve of the to-be-tested sealing device penetrates through a steel wire rope sleeve hole in the left end face of the sealing device plug, and the airtight cylinder and the water tank are communicated; firstly, the airtight cylinder is inflated to preset pressure, then water is drained after it is judged that the sealing device reaches the critical sealing state through water in the water tank, and the gap between the shell and the cover plate and the starting force needed for pulling the steel wire rope sleeve are measured. A worker can guide installation according to the gap value corresponding to the starting force, installation completely depending on experience is avoided, and therefore the situation that an adjusting screw is too tight or too loose is avoided.

Description

Technical Field

[0001] The invention relates to the field of aircraft control systems, and in particular to a testing device and method for a sealing device at a wire rope lead-out point. Background Art

[0002] The control cable of the aircraft soft control system needs to be sealed in the process of going from the airtight area to the non-airtight area. The sealing device at the wire rope lead-out point (hereinafter referred to as the "sealing device") is a commonly used important sealing structural part. Now it generally adopts a similar structure to the navigation manual HB5-1-83, including a sealing ball, a shell, a cover plate, a wire rope sleeve, an adjusting screw and a self-locking nut. Its working principle is that the inner surface of the shell and the cover plate matches the sealing ball profile, the wire rope sleeve passes through the middle of the sealing ball, and the sealing device installs the shell, the cover plate and the sealing ball on the wall plate of the airtight area through the adjusting screw. The clamping force of the adjusting screw causes the cover plate to press the sealing ball, causing the sealing ball to deform and tightly wrap the wire rope sleeve to ensure that the wire rope sleeve does not leak when sliding between the airtight area and the non-airtight area.

[0003] When installing the sealing device on the aircraft, workers must complete the assembly in the unpressurized state of the airtight area. If the adjusting screw is adjusted too tight, it will cause a large amount of pressure on the sealing ball, thereby increasing the sliding friction resistance between the wire rope sleeve and the sealing ball, which is not conducive to the determination of the control force value of the aircraft control system. If it is too loose, it will cause insufficient pressure on the sealing ball, which is easy to cause air leakage. However, at present, when workers install the sealing device, there is no quantitative reference basis for how much pressure is needed on the sealing ball, and the range of the starting force value of the wire rope sleeve movement under a specific pressure difference cannot be obtained in the standard parts manual. In addition, the specifications of the sealing devices on different aircraft are different. Therefore, workers install them completely based on experience, which makes it easy for the adjusting screw to be too tight or too loose, which is very detrimental to the flight safety of the aircraft. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a testing device and method for a sealing device at a wire rope lead-out point, in which the gap between a shell and a cover plate is used to characterize the pressure on a sealing ball, and an airtight cylinder and a water tank are provided to simulate the installation environment of the sealing device at the wire rope lead-out point on an aircraft from an airtight area to a non-airtight area. Before installation on the aircraft, the starting force values ​​of the wire rope casing movement corresponding to different gaps between the shell and the cover plate under different specific pressure differences can be measured on the ground. In this way, when installing the sealing device on the aircraft, workers can find the corresponding starting force according to the requirements for operating force under different pressures in the manual, and use the gap value corresponding to the starting force to guide the installation, so as to avoid installation entirely based on experience, thereby avoiding the situation where the adjusting screw is too tight or too loose.

[0005] The technical solution of the present invention is:

[0006] A testing device for a sealing device at a wire rope lead-out location, comprising a plug, an air inlet valve, a safety valve, a pressure gauge, an airtight cylinder, a water tank, an airtight cylinder sealing rubber ring, a water tank sealing ring, a mounting nut, a sealing device plug, and a water tank plug;

[0007] The left end of the sealing device plug is fixedly and sealedly connected to the right side wall of the water tank, and the right end of the sealing device plug is fixedly and sealedly connected to the left side wall of the airtight cylinder; the left end surface of the sealing device plug is a plane, which is used to install the sealing device to be tested;

[0008] The airtight cylinder is a cylinder-type structure, the right end face of the airtight cylinder is sealed and fixed with a plug, the air pressure gauge and safety valve are arranged on the airtight cylinder; an air intake valve is arranged on the side of the airtight cylinder; the air pressure gauge is used to measure the internal pressure of the airtight cylinder, the safety valve is a pressure protection device of the airtight cylinder, and the air intake valve is a control channel for the air intake hole of the airtight cylinder;

[0009] The water tank is open, and the water tank plug is arranged on the left side of the water tank for draining water to adjust the liquid level.

[0010] Furthermore, the sealing device plug is a tubular structure, with a water sink mounting external thread on the left end, an air-tight cylinder mounting external thread on the right end, and a standard hexagonal tightening part in the middle, which can be tightened and disassembled with a standard open-end wrench, and raw tape is wrapped around the water sink mounting external thread and the air-tight cylinder mounting external thread; the right side wall of the water sink is provided with a circular hole matching the size of the left end of the sealing device plug, and the water sink mounting external thread section at the left end of the sealing device plug is passed through the circular hole and fastened with the mounting nut; a water sink sealing ring is provided between the mounting nut and the water sink to ensure the sealing; a threaded hole is provided on the left side wall of the air-tight cylinder, which matches the air-tight cylinder mounting external thread at the right end of the sealing device plug; the right end of the sealing device plug is connected to the air-tight cylinder through a thread, and an air-tight cylinder sealing rubber ring is provided between the right end of the sealing device plug and the air-tight cylinder to ensure the sealing.

[0011] Furthermore, the plane at the left end of the sealing device plug is the installation surface of the sealing device to be tested; a wire rope casing hole and an adjusting screw hole are provided on the left end surface of the sealing device plug; the interior of the right end of the sealing device plug is a cavity; the adjusting screw of the sealing device to be tested passes through the adjusting screw hole on the left end surface from the cavity at the right end of the sealing device plug to the left, and the shell, cover plate and sealing ball of the sealing device to be tested are installed on the left end surface of the sealing device plug in cooperation with the self-locking nut, and the wire rope casing of the sealing device to be tested passes through the wire rope casing hole on the left end surface of the sealing device plug to connect the airtight cylinder and the water tank.

[0012] Furthermore, the airtight cylinder is connected to the plug via threads, and a sealing rubber ring of the airtight cylinder is provided between the airtight cylinder and the plug to ensure sealing.

[0013] The method for measuring the range of the starting force value of the steel wire rope casing movement of the sealing device to be tested using the above-mentioned testing device for the steel wire rope lead-out sealing device comprises the following steps:

[0014] Step 1: Install the sealing device to be tested on the left end surface of the sealing device plug. During installation, apply sealant on the contact surface of the sealing device plug to ensure the sealing performance. Tighten the self-locking nut until the housing and the cover plate slightly press the sealing ball. Connect the air inlet valve to the high-pressure air source.

[0015] Step 2: Pour water into the water tank until the liquid level covers the sealing device to be tested, open the air inlet valve, and slowly fill the airtight cylinder with gas. When the air pressure in the airtight cylinder reaches the preset pressure value, close the air inlet valve and record the pressure gauge reading at this time;

[0016] Step 3: Tighten the two self-locking nuts separately until there is no bubble at the sealing device to be tested. Use a feeler gauge to measure the gap between the shell and the cover. After ensuring that the gap is uniform, drain the water in the sink and record the gap between the shell and the cover at this time.

[0017] Step 4: Use an electronic dynamometer to pull the wire rope casing axially, and record the dynamometer reading when the wire rope casing is just pulled, which is the movement starting force value of the wire rope casing at this time;

[0018] Step 5: Divide the gap between the shell and the cover plate measured in step 3 into several equal parts at equal intervals, tighten the two self-locking nuts respectively, and evenly reduce the gap between the shell and the cover plate at equal intervals. Repeat step 4 to measure the movement starting force value of the wire rope casing, and record each set of gap values ​​and corresponding force values ​​until the gap is 0, that is, obtain the movement starting force value range and corresponding gap value of the wire rope casing under the set pressure.

[0019] Furthermore, in step 5, the gap between the shell and the cover plate is divided into 5 to 8 equal parts at equal intervals.

[0020] After the above test steps, the starting force values ​​of the wire rope casing movement corresponding to different housing and cover gaps under different set pressures are obtained, and the different housing and cover gaps correspond to the pressure of the housing and cover on the sealing ball. When workers install the sealing device on the machine, they look up the corresponding starting force according to the requirements for operating force under different pressures in the manual, and use the gap value corresponding to the starting force to guide the installation, avoiding installation based entirely on experience, thereby avoiding the situation where the adjustment screw is too tight or too loose.

[0021] Beneficial Effects

[0022] The present invention provides a testing device and method for a sealing device at a wire rope lead-out location, wherein the gap between a shell and a cover plate is used to characterize the pressure on a sealing ball, and an airtight cylinder and a water tank are provided to simulate the installation environment of the sealing device at the wire rope lead-out location on an aircraft from an airtight area to a non-airtight area. Before installation on the aircraft, the starting force values ​​of the wire rope casing movement corresponding to the gaps between different shells and cover plates under different specific pressure differences can be measured on the ground. In this way, when installing the sealing device on the aircraft, workers can find the corresponding starting force according to the requirements for the operating force under different pressures in the manual, and use the gap value corresponding to the starting force to guide the installation, so as to avoid installation completely based on experience, thereby avoiding the situation where the adjusting screw is too tight or too loose. In addition, the current navigation manual and various sealing devices with the same structure do not have reference starting force values, and the test data can fill the gap in the standard parts manual. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the testing equipment according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 for Figure 1 A longitudinal cross-sectional view of

[0026] Figure 4 A longitudinal cross-sectional view of the installation position of the sealing device to be tested according to an embodiment of the present invention;

[0027] Figure 5 A transverse cross-sectional view of the installation position of the sealing device to be tested according to an embodiment of the present invention;

[0028] In the figure: 1-plug; 2-inlet valve; 3-safety valve; 4-pressure gauge; 5-airtight cylinder; 6-water tank; 7-airtight cylinder sealing rubber ring; 8-water tank sealing ring; 9-mounting nut; 10-sealing device plug; 11-sealing device to be tested; 12-water tank plug; 14-housing; 15-cover plate; 16-sealing ball; 17-wire rope casing; 18-adjusting screw; 19-self-locking nut. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, and to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described and fully described in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] A test device for a sealing device at a wire rope outlet of this embodiment is as follows: Figures 1 to 3As shown, it includes a plug 1, an air inlet valve 2, a safety valve 3, a pressure gauge 4, an airtight cylinder 5, a water tank 6, an airtight cylinder sealing rubber ring 7, a water tank sealing ring 8, a mounting nut 9, a sealing device plug 10, and a water tank plug 12;

[0031] The left end of the sealing device plug 10 is fixedly sealed and connected to the right side wall of the water tank 6, and the right end of the sealing device plug 10 is fixedly sealed and connected to the left side wall of the airtight cylinder 5; the left end surface of the sealing device plug 10 is a plane, for installing the sealing device 11 to be tested;

[0032] The airtight cylinder 5 is a cylinder structure, the right end face of the airtight cylinder 5 is sealed and fixed with a plug 1, the air pressure gauge 4 and the safety valve 3 are arranged on the airtight cylinder 5; the side of the airtight cylinder 5 is provided with an air intake valve 2; the air pressure gauge 4 is used to measure the internal pressure of the airtight cylinder 5, the safety valve 3 is a pressure protection device of the airtight cylinder 5, and the air intake valve 2 is a control channel for the air intake hole of the airtight cylinder 5;

[0033] The water tank 6 is open, and the water tank plug 12 is provided on the left side of the water tank 6 for draining water to adjust the liquid level.

[0034] In this embodiment, the sealing device plug 10 is a tubular structure, with a water tank installation external thread at the left end, a gas-tight tube installation external thread at the right end, and a standard hexagonal tightening portion in the middle, which can be tightened and disassembled with a standard open-end wrench, and raw tape is wrapped around the water tank installation external thread and the gas-tight tube installation external thread; the right side wall of the water tank 6 is provided with a circular hole matching the size of the left end of the sealing device plug 10, and the water tank installation external thread section at the left end of the sealing device plug 10 passes through the circular hole and is fastened with the installation nut 9; a water tank sealing ring 8 is provided between the installation nut 9 and the water tank 6 to ensure sealing;

[0035] The left wall of the airtight cylinder 5 is provided with a threaded hole, which matches the external thread of the airtight cylinder installation at the right end of the sealing device plug 10; the right end of the sealing device plug 10 is connected to the airtight cylinder 5 through a thread, and an airtight cylinder sealing rubber ring 7 is provided between the right end of the sealing device plug 10 and the airtight cylinder 5 to ensure sealing;

[0036] like Figure 4 and Figure 5As shown, the plane at the left end of the sealing device plug 10 is the installation surface of the sealing device 11 to be tested; a wire rope casing hole and an adjusting screw hole are provided on the left end face of the sealing device plug 10; the interior of the right end of the sealing device plug 10 is a cavity; the adjusting screw 18 of the sealing device 11 to be tested passes through the adjusting screw hole on the left end face from the cavity at the right end of the sealing device plug 10 to the left, and the shell 14, cover plate 15 and sealing ball 16 of the sealing device 11 to be tested are installed on the left end face of the sealing device plug 10 in cooperation with the self-locking nut 19, and the wire rope casing 17 of the sealing device 11 to be tested passes through the wire rope casing hole on the left end face of the sealing device plug 10 to connect the airtight cylinder 5 and the water tank 6.

[0037] In this embodiment, the airtight tube 5 is connected to the plug 1 by threads, and an airtight tube sealing rubber ring 7 is provided between the airtight tube 5 and the plug 1 to ensure sealing.

[0038] The method for measuring the range of the starting force value of the wire rope casing movement of a certain type of sealing device using the above-mentioned testing equipment for the wire rope lead-out sealing device comprises the following steps:

[0039] Step 1: Install the sealing device 11 to be tested onto the left end surface of the sealing device plug 10. During installation, apply sealant on the contact surface of the sealing device plug 10 to ensure sealing performance. Tighten the self-locking nut 19 until the housing 14 and the cover plate 15 slightly press the sealing ball 16. Connect the intake valve 2 to the high-pressure gas source.

[0040] Step 2: Pour water into the water tank 6 until the liquid level covers the sealing device 11 to be tested, open the air inlet valve 2, and slowly fill the air into the airtight cylinder 5. When the air pressure value of the airtight cylinder 5 reaches the preset pressure value, close the air inlet valve and record the reading of the pressure gauge 4 at this time;

[0041] Step 3: Tighten the two self-locking nuts 19 respectively until there is no bubble at the sealing device 11 to be tested, and measure the gap between the housing 14 and the cover plate 15 with a feeler gauge. After ensuring that the gap is uniform, drain the water in the water tank 6; record the gap between the housing 14 and the cover plate 15 at this time;

[0042] Step 4: Use an electronic dynamometer to pull the wire rope casing 17 axially, and record the dynamometer reading when the wire rope casing 17 is just pulled, which is the movement starting force value of the wire rope casing 17 at this time;

[0043] Step 5: Divide the gap between the shell 14 and the cover plate 15 measured in step 3 into eight equal parts at equal intervals, tighten the two self-locking nuts 19 respectively, and evenly reduce the gap between the shell 14 and the cover plate 15 at equal intervals. Repeat step 4, measure the movement starting force value of the wire rope casing 17, and record each set of gap values ​​and corresponding force values ​​until the gap is 0, that is, obtain the movement starting force value range and corresponding gap value of the wire rope casing 17 under the set pressure.

[0044] After the above test steps, the starting force values ​​of the wire rope casing movement corresponding to different housing and cover gaps under different set pressures are obtained, and the different housing and cover gaps correspond to the pressure of the housing and cover on the sealing ball. When workers install the sealing device on the machine, they look up the corresponding starting force according to the requirements for operating force under different pressures in the manual, and use the gap value corresponding to the starting force to guide the installation, avoiding installation based entirely on experience, thereby avoiding the situation where the adjustment screw is too tight or too loose.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A testing device for a sealing device at a wire rope outlet, characterized in that: Including plug, air inlet valve, safety valve, pressure gauge, airtight cylinder, water tank, airtight cylinder sealing rubber ring, water tank sealing ring, mounting nut, sealing device plug, water tank plug; The left end of the sealing device plug is fixedly and sealedly connected to the right side wall of the water tank, and the right end of the sealing device plug is fixedly and sealedly connected to the left side wall of the airtight cylinder; the left end surface of the sealing device plug is a plane, which is used to install the sealing device to be tested; The airtight cylinder is a cylinder-type structure, the right end face of the airtight cylinder is sealed and fixed with a plug, the air pressure gauge and safety valve are arranged on the airtight cylinder; an air intake valve is arranged on the side of the airtight cylinder; the air pressure gauge is used to measure the internal pressure of the airtight cylinder, the safety valve is a pressure protection device of the airtight cylinder, and the air intake valve is a control channel for the air intake hole of the airtight cylinder; The water tank is open, and the water tank plug is arranged on the left side of the water tank for draining water to adjust the liquid level.

2. The testing device for the sealing device at the wire rope outlet according to claim 1, characterized in that: The sealing device plug is a tubular structure, with a water sink mounting external thread provided at the left end, an airtight cylinder mounting external thread provided at the right end, and a standard hexagonal tightening part provided in the middle, which can be tightened and disassembled with a standard open-end wrench, and raw tape is wrapped around the water sink mounting external thread and the airtight cylinder mounting external thread; the right side wall of the water sink is provided with a circular hole matching the size of the left end of the sealing device plug, and the water sink mounting external thread section at the left end of the sealing device plug is passed through the circular hole and fastened with the mounting nut; a water sink sealing ring is provided between the mounting nut and the water sink to ensure sealing; a threaded hole is provided on the left side wall of the airtight cylinder to match the airtight cylinder mounting external thread at the right end of the sealing device plug; the right end of the sealing device plug is connected to the airtight cylinder by threads, and an airtight cylinder sealing rubber ring is provided between the right end of the sealing device plug and the airtight cylinder to ensure sealing.

3. The testing device for the sealing device at the wire rope outlet according to claim 2, characterized in that: The plane at the left end of the sealing device plug is the installation surface of the sealing device to be tested; a wire rope casing hole and an adjusting screw hole are provided on the left end surface of the sealing device plug; the inside of the right end of the sealing device plug is a cavity; the adjusting screw of the sealing device to be tested passes through the adjusting screw hole on the left end surface from the cavity at the right end of the sealing device plug to the left, and the shell, cover plate and sealing ball of the sealing device to be tested are installed on the left end surface of the sealing device plug in cooperation with the self-locking nut, and the wire rope casing of the sealing device to be tested passes through the wire rope casing hole on the left end surface of the sealing device plug to connect the airtight cylinder and the water tank.

4. The testing device for the sealing device at the wire rope outlet according to claim 1, characterized in that: The airtight cylinder is connected to the plug through threads, and a sealing rubber ring of the airtight cylinder is arranged between the airtight cylinder and the plug to ensure sealing.

5. A method for measuring the range of the starting force value of the movement of the steel wire rope casing of the tested sealing device using the testing device of the steel wire rope lead-out sealing device according to any one of claims 1 to 4, characterized in that: The steps include:. Step 1: Install the sealing device to be tested on the left end surface of the sealing device plug. During installation, apply sealant on the contact surface of the sealing device plug to ensure the sealing performance. Tighten the self-locking nut until the housing and the cover plate slightly press the sealing ball. Connect the air inlet valve to the high-pressure air source. Step 2: Pour water into the water tank until the liquid level covers the sealing device to be tested, open the air inlet valve, and slowly fill the airtight cylinder with gas. When the air pressure in the airtight cylinder reaches the preset pressure value, close the air inlet valve and record the pressure gauge reading at this time; Step 3: Tighten the two self-locking nuts separately until there is no bubble at the sealing device to be tested. Use a feeler gauge to measure the gap between the shell and the cover. After ensuring that the gap is uniform, drain the water in the sink and record the gap between the shell and the cover at this time. Step 4: Use an electronic dynamometer to pull the wire rope casing axially, and record the dynamometer reading when the wire rope casing is just pulled, which is the movement starting force value of the wire rope casing at this time; Step 5: Divide the gap between the shell and the cover plate measured in step 3 into several equal parts at equal intervals, tighten the two self-locking nuts respectively, and evenly reduce the gap between the shell and the cover plate at equal intervals. Repeat step 4 to measure the movement starting force value of the wire rope casing, and record each set of gap values ​​and corresponding force values ​​until the gap is 0, that is, obtain the movement starting force value range and corresponding gap value of the wire rope casing under the set pressure.

6. The measuring method according to claim 5, characterized in that: In step 5, the gap between the shell and the cover is divided into 5 to 8 equal parts at equal intervals.

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