Special device for debugging aircraft servo valve

Abstract

The utility model belongs to the technical field of aviation equipment, and relates to a special device for debugging an airplane servo valve, which comprises a pole shoe adjusting rod, a fixed shell, a pole shoe pressing sheet, a pole shoe adjusting sheet, an adjusting sheet cover plate, a pressing sheet cover plate and a current limiting adjusting rod. The device is provided with the pole shoe adjusting rod and the pole shoe pressing piece which are matched with each other, so that the position of the pole shoe can be accurately adjusted, and the rated flow is adjusted until the rated flow is qualified. The flow-limiting adjusting rod is of a threaded structure, the upper end of the flow-limiting adjusting rod is of a ball head structure, when the adjusting rod is screwed in, the ball head makes contact with the flow-limiting hole of the servo valve cover plate, the flow-limiting hole of the pressing plate is extruded to deform, and compared with a traditional mode that the flow-limiting hole is directly knocked to deform. And the limit flow of the servo valve can be more accurately controlled, so that the process requirement is met, and repeated work is reduced. The device is a combined part, is firm in fixation, is convenient to operate, and achieves the debugging operability of the aircraft servo valve. The aircraft servo valve performance debugging device can be used for accurately achieving aircraft servo valve performance debugging, and efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment technology and relates to a special device for debugging aircraft servo valves. Background Technology

[0002] The aircraft operating system is a crucial system for controlling aircraft attitude and plays a vital role in flight. It controls the aircraft's flight status based on pilot input commands. Its proper functioning directly determines the aircraft's safe flight. Electro-hydraulic servo valves, as key components of the aircraft operating system, are widely used in aerospace. Installed on the servo motors, they function as electro-hydraulic converters and power amplifiers. Electro-hydraulic servo valves are complex and highly precise. Specifically, during system operation, they receive electrical signals from the fly-by-wire system and convert them into proportional signals with corresponding polarity, controlling the load flow or load pressure of the electro-hydraulic servo valve. This results in the system outputting significant hydraulic power to drive the corresponding actuators. They consist of several parts, including a coil assembly, magnetic circuit system assembly, housing assembly, oil filter, and pressure plate. When the servo valve operates, it changes the relative position of the feedback rod based on the received current value, thereby changing the valve core position to control the servo valve's flow output. It is the core power amplifier component that converts electrical signals into hydraulic signals.

[0003] Electro-hydraulic servo valves are complex and require high precision. During testing and debugging, operators use a small hammer to tap the valve's pole shoes and pressure plate flow-limiting adjustment holes along the test bench to change their relative positions, thereby adjusting the servo valve's flow performance. Based on its working principle, tapping the pole shoes adjusts the rated flow, while tapping the pressure plate flow-limiting adjustment holes adjusts the maximum flow. Currently, there is no dedicated equipment for debugging; manual tapping based on experience is difficult to control, inconvenient, repetitive, time-consuming, and labor-intensive. Furthermore, careless use of force can easily damage the servo valve, posing potential quality issues. Additionally, the high cost of servo valves increases maintenance costs. Therefore, a dedicated debugging device is urgently needed to meet the debugging requirements of aircraft electro-hydraulic servo valves, thereby freeing up manpower, improving quality, eliminating potential problems, and saving costs.

[0004] When testing and debugging the servo valve, first fix the servo valve on the test bench base. After connecting the pressure supply, adjust the pressure to the working pressure of the aircraft hydraulic system. Then, connect the wires of the two coils in series. Adjust the rated flow by tapping the pole shoe with a small hammer, and adjust the limit flow by tapping the steel rod extending into the upper flow limit hole of the servo valve pressure plate. Because the tapping force is difficult to control, the operator needs to repeatedly tap the pole shoe and the steel rod on the pressure plate flow limit adjustment hole of the servo valve with a small hammer in a left-right direction to adjust the servo valve performance and ensure that the rated flow and limit flow of the servo valve output meet the process requirements.

[0005] The following shortcomings exist: the tapping tool is a general-purpose tool, which is relatively crude and results in uneven force application during use, leading to significant randomness and frequent repetitions, increasing workload; when tapping the steel rod on the flow-limiting adjustment hole of the pressure plate, it is difficult to control the force, and excessive force will result in an insufficient limit flow, requiring the pressure plate to be disassembled and tapped in the opposite direction, wasting time and effort; manual tapping is time-consuming, labor-intensive, and inconvenient to operate, and in certain situations, it can even easily cause injury to personnel, posing certain safety issues; the tapping point is not fixed, which poses a risk of damaging the servo valve. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a dedicated device for testing and debugging aircraft servo valves. This device is used for testing and debugging the performance of aircraft servo valves, eliminating safety hazards, improving testing efficiency, enhancing repair quality, and saving repair costs.

[0007] The technical solution of this utility model is as follows:

[0008] A special device for debugging aircraft servo valves includes a pole shoe adjusting rod 1, a fixed housing 2, a pole shoe clamping plate 3, a pole shoe adjusting plate 4, an adjusting plate cover plate 5, a clamping plate cover plate 6, and a flow limiting adjusting rod 7.

[0009] The fixed housing 2 has two symmetrical through-hole vertical grooves on its front end face for mounting the device on the test bench base boss and further securing it with bolts; the upper surface of the fixed housing 2 has a groove, and the area below the groove is hollow; the pole shoe adjusting plate 4 is an L-shaped plate with its long side placed horizontally, contacting the upper surface of the groove on the upper surface of the fixed housing 2, and the end of the long side protruding out of the groove; the adjusting plate cover plate 5 is fixedly mounted on the groove on the upper surface of the fixed housing 2 with bolts, limiting the pole shoe adjusting plate 4 within the groove. The pole shoe adjusting plate 4 can move back and forth in the groove; the pole shoe clamping plate 3 is an L-shaped plate with its long side placed horizontally and in contact with the bottom surface of the groove on the upper surface of the fixed housing 2. The end of the long side extends out of the hollow structure, and its short side is arranged vertically downward; the clamping plate cover plate 6 is fixedly installed below the bottom surface of the groove on the upper surface of the fixed housing 2 by bolts to limit the pole shoe clamping plate 3, and the pole shoe clamping plate 3 can move back and forth in the space formed between the clamping plate cover plate 6 and the bottom surface of the groove on the upper surface of the fixed housing 2.

[0010] There are two pole shoe adjusting rods 1. The upper part of the fixed housing 2 is provided with two horizontal, through threaded holes, one upper, one middle, and one lower. The front end of the upper threaded hole is opposite to the short side of the pole shoe adjusting plate 4, and is used to install one of the pole shoe adjusting rods 1. When the pole shoe adjusting rod 1 is screwed in, the front end of the pole shoe adjusting rod 1 abuts against the short side of the pole shoe adjusting plate 4, pushing the pole shoe adjusting plate 4 forward as a whole. The front end of the middle threaded hole is opposite to the short side of the pole shoe clamping plate 3, and is used to install the other pole shoe adjusting rod 1. When the pole shoe adjusting rod 1 is screwed in, the front end of the pole shoe adjusting rod 1 abuts against the short side of the pole shoe clamping plate 3, pushing the pole shoe clamping plate 3 forward as a whole. The pole shoe clamping plate 3 is used to clamp the bolt at the pole shoe, and the pole shoe adjusting plate 4 further contacts the pole shoe to adjust the rated flow. The lower threaded hole extends to the hollow structure part in the middle of the fixed housing 2, and is used to install the flow limiting adjusting rod 7. The flow limiting adjusting rod 7 is opposite to the flow limiting hole of the cover plate of the aircraft servo valve.

[0011] The front end of the flow limiting adjustment rod 7 is a ball head structure, which contacts the flow limiting hole of the cover plate of the aircraft servo valve.

[0012] The aforementioned pole shoe adjusting rod 1, adjusting plate cover 5, pressing plate cover 6, and current limiting adjusting rod 7 are all made of steel.

[0013] The front end of the pole shoe clamping plate 3 has a toothed structure, which cooperates with the bolt at the pole shoe to clamp the bolt.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model designs a special device for debugging aircraft servo valves, which is used to accurately debug the performance of aircraft servo valves and improve efficiency.

[0016] 2. The special device for debugging aircraft servo valves has a pole shoe adjusting rod and a pole shoe clamping plate. The two work together to precisely adjust the position of the pole shoe, thereby adjusting the rated flow rate until it is qualified.

[0017] 3. The flow-limiting adjustment rod of the aircraft servo valve debugging device has a threaded structure and a ball head structure at the upper end. When the adjustment rod is screwed in, the ball head contacts the flow-limiting hole of the servo valve cover plate, squeezing the flow-limiting hole of the pressure plate and causing it to deform. Compared with the traditional method of directly striking the flow-limiting hole to deform it, this allows for more precise control of the servo valve's limit flow rate to meet process requirements and reduce repetitive work.

[0018] 4. This utility model is a modular assembly, which is firmly fixed and easy to operate, thus enabling the operability of aircraft servo valve debugging. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the device of this utility model;

[0020] Figure 2(a) is a front view of the device of this utility model, and Figure 2(b) is a cross-sectional view of Figure 2(a) along the AA direction;

[0021] Figure 3(a) is a top view of the fixed shell, Figure 3(b) is a front view of the fixed shell, and Figure 3(c) is a sectional view of Figure 3(b) along the BB direction.

[0022] Figure 4(a) and Figure 4(b) are the top view and cross-sectional view of the pole shoe adjustment piece, respectively;

[0023] Figures 5(a) and 5(b) are schematic diagrams of the pole shoe clamping plate, respectively;

[0024] Figure 6(a) is a top view of the adjustment plate cover, Figure 6(b) is a sectional view of Figure 6(a) along the BB direction, and Figure 6(c) is a sectional view of Figure 6(a) along the AA direction.

[0025] Figure 7(a) and Figure 7(b) are top and side views of the clamping plate cover, and Figure 7(c) is a sectional view along line AA of Figure 7(a).

[0026] Figure 8 Schematic diagram of the pole shoe adjusting rod;

[0027] Figure 9 This is a schematic diagram of the current limiting adjustment lever.

[0028] In the diagram: 1. Pole shoe adjusting rod, 2. Fixed housing, 3. Pole shoe clamping plate, 4. Pole shoe adjusting plate, 5. Adjusting plate cover, 6. Clamping plate cover, 7. Current limiting adjusting rod. Detailed Implementation

[0029] The specific embodiments of this utility model are further described below with reference to the accompanying drawings and technical solutions.

[0030] like Figure 1 As shown in Figures 2(a) and 2(b), a special device for debugging an aircraft servo valve includes a pole shoe adjusting rod 1, a fixed housing 2, a pole shoe clamping plate 3, a pole shoe adjusting plate 4, an adjusting plate cover 5, a clamping plate cover 6, and a flow limiting adjusting rod 7.

[0031] like Figures 3(a) to 3(c) As shown, the fixed housing 2 has two symmetrical through vertical grooves on its front end face, which are used to install the device on the test bench base boss and further tighten it with bolts; the upper surface of the fixed housing 2 has grooves, and the bottom of the grooves is a hollow structure.

[0032] As shown in Figures 4(a) and 4(b), the pole shoe adjusting plate 4 is an L-shaped plate with its long side placed horizontally, contacting the upper surface of the groove on the upper surface of the fixed housing 2, and the end of the long side extending out of the groove; Figures 6(a) to 6(c)As shown, the adjustment plate cover 5 is fixedly installed on the groove on the upper surface of the fixed housing 2 by bolts, which limits the pole shoe adjustment plate 4 in the groove, and the pole shoe adjustment plate 4 can move back and forth in the groove.

[0033] As shown in Figures 5(a) and 5(b), the pole shoe clamping plate 3 is an L-shaped plate with its long side placed horizontally, contacting the bottom surface of the groove on the upper surface of the fixed housing 2. The end of the long side extends out of the hollow structure, and its short side is arranged vertically downwards; Figures 7(a) to 7(c) As shown, the clamping plate cover 6 is bolted to the bottom of the groove on the upper surface of the fixed housing 2, limiting the position of the pole shoe clamping plate 3. The pole shoe clamping plate 3 can move back and forth within the space formed between the clamping plate cover 6 and the bottom of the groove on the upper surface of the fixed housing 2. The front end of the pole shoe clamping plate 3 has a toothed structure, which cooperates with the bolt at the pole shoe to clamp the bolt.

[0034] like Figure 8 As shown, there are two pole shoe adjusting rods 1. The upper part of the fixed housing 2 has two horizontal, through-hole threads: an upper threaded rod and a middle threaded rod. The front end of the upper threaded hole is opposite to the short side of the pole shoe adjusting plate 4, and is used to install one of the pole shoe adjusting rods 1. When the pole shoe adjusting rod 1 is screwed in, the front end of the pole shoe adjusting rod 1 abuts against the short side of the pole shoe adjusting plate 4, pushing the pole shoe adjusting plate 4 forward as a whole. The front end of the middle threaded hole is opposite to the short side of the pole shoe clamping plate 3, and is used to install the other pole shoe adjusting rod 1. When the pole shoe adjusting rod 1 is screwed in, the front end of the pole shoe adjusting rod 1 abuts against the short side of the pole shoe clamping plate 3, pushing the pole shoe clamping plate 3 forward as a whole. The pole shoe clamping plate 3 is used to clamp the bolt at the pole shoe, and the pole shoe adjusting plate 4 further contacts the pole shoe to adjust the rated flow. The lower threaded hole extends to the hollow structure in the middle of the fixed housing 2, and is used to install the flow limiting adjusting rod 7. The flow limiting adjusting rod 7 is opposite to the flow limiting hole of the cover plate of the aircraft servo valve. The structure of the flow limiting adjusting rod 7 is as follows: Figure 9 As shown, the front end has a ball head structure. When screwed in, the ball head contacts the flow-limiting hole of the servo valve cover plate, squeezing the flow-limiting hole to deform it, thereby controlling the limit flow of the servo valve.

[0035] When debugging the servo valve's flow performance, the servo valve is fixed to the test bench base. This debugging device uses the vertical groove design of the fixed housing 2 to clamp the test bench base boss. After aligning with the tapping point, bolts are inserted into the groove and screwed into the threaded holes of the test bench to fix the debugging device. When adjusting the rated flow, the position of the pole shoe needs to be changed. This is done by screwing in the lower pole shoe adjusting rod 1 of this device, pressing against the pole shoe clamping plate 3 to tighten the bolt at the pole shoe. Then, continue screwing in the upper pole shoe adjusting rod 1, pushing in the pole shoe adjusting plate 4 so that it contacts the pole shoe. Adjust the rated flow by screwing in the upper pole shoe adjusting rod 1 according to the flow change. The flow limiting adjusting rod 7 has a threaded structure and a ball head structure at the top. When debugging the servo valve's limit flow performance, the flow limiting adjusting rod 7 is screwed in, and the ball head of the adjusting rod contacts the flow limiting hole of the servo valve's cover plate. Continue screwing in the flow limiting adjusting rod 7, squeezing the flow limiting hole to deform it, thereby controlling the servo valve's limit flow until the requirement is met.

Claims

1. A special device for adjusting aircraft servo valves, characterized in that, The aircraft servo valve debugging device includes a pole shoe adjusting rod (1), a fixed housing (2), a pole shoe clamping plate (3), a pole shoe adjusting plate (4), an adjusting plate cover plate (5), a clamping plate cover plate (6), and a flow limiting adjusting rod (7). The fixed housing (2) has two symmetrical through-hole vertical grooves on its front end face for mounting the device on the test bench base boss and further securing it with bolts; the upper surface of the fixed housing (2) has a groove, and the lower part of the groove is a hollow structure; the pole shoe adjustment plate (4) is an L-shaped plate with its long side placed horizontally and in contact with the upper surface of the groove on the upper surface of the fixed housing (2), with the end of the long side extending out of the groove; the adjustment plate cover plate (5) is fixedly installed on the groove on the upper surface of the fixed housing (2) with bolts, limiting the pole shoe adjustment plate (4) in the groove. In the middle, the pole shoe adjusting plate (4) can move back and forth in the groove; the pole shoe clamping plate (3) is an L-shaped plate with its long side placed horizontally and in contact with the bottom surface of the groove on the upper surface of the fixed housing (2). The end of the long side extends out of the hollow structure, and its short side is arranged vertically downward; the clamping plate cover plate (6) is fixedly installed below the bottom surface of the groove on the upper surface of the fixed housing (2) by bolts to limit the pole shoe clamping plate (3), and the pole shoe clamping plate (3) can move back and forth in the space formed between the clamping plate cover plate (6) and the bottom surface of the groove on the upper surface of the fixed housing (2); There are two pole shoe adjusting rods (1). The upper part of the fixed housing (2) is provided with two horizontal, through threaded holes, one upper, one middle, and one lower. The front end of the upper threaded hole is opposite to the short side of the pole shoe adjusting plate (4) and is used to install one of the pole shoe adjusting rods (1). When the pole shoe adjusting rod (1) is screwed in, the front end of the pole shoe adjusting rod (1) abuts against the short side of the pole shoe adjusting plate (4) and pushes the pole shoe adjusting plate (4) forward as a whole. The front end of the middle threaded hole is opposite to the short side of the pole shoe clamping plate (3) and is used to install the other one. When the pole shoe adjusting rod (1) is screwed in, the front end of the pole shoe adjusting rod (1) abuts against the short side of the pole shoe clamping plate (3), pushing the pole shoe clamping plate (3) to move forward as a whole; the pole shoe clamping plate (3) is used to clamp the bolt at the pole shoe, and the pole shoe adjusting plate (4) further contacts the pole shoe to adjust the rated flow; the lower threaded hole penetrates to the hollow structure part in the middle of the fixed housing (2) for installing the flow limiting adjusting rod (7), and the flow limiting adjusting rod (7) is opposite to the flow limiting hole of the cover plate of the aircraft servo valve.

2. The special device for debugging an aircraft servo valve according to claim 1, characterized in that, The front end of the flow limiting adjustment rod (7) is a ball head structure, which contacts the flow limiting hole of the cover plate of the aircraft servo valve.

3. A special device for adjusting an aircraft servo valve according to claim 1 or 2, characterized in that, The aforementioned pole shoe adjusting rod (1), adjusting plate cover (5), pressing plate cover (6) and current limiting adjusting rod (7) are made of steel.

4. A special device for adjusting an aircraft servo valve according to claim 1 or 2, characterized in that, The front end of the pole shoe clamping plate (3) is toothed and cooperates with the bolt at the pole shoe to clamp the bolt.

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