A fixing clamp for assembling a flow control valve actuating cylinder

Abstract

The utility model discloses a kind of fixing clamps for flow control valve actuator cylinder assembly, including base (2), side face adjusting clamping block (3), side face adjusting screw (4), screw (7), adjusting support rod (6), small screw (5), bolt (8), gasket (9) and fixed nut (10) nine sub-components;T-shaped groove on base upper surface and clamping block slide rail sliding fit, side face adjusting screw pushes and clamps block transverse clamping shell;Screw (7) vertical support shell bottom surface;Adjusting support rod transversely enters shell bushing, bolt passes through connecting rod lug and support rod through-hole in sequence and is locked by fixed nut, small screw is tightly supported rod and prevents rotating.The static connection structure of the utility model completes shell transverse, longitudinal and connecting rod axial positioning once, and the structure is simple, positioning is reliable, and is suitable for quick, safe assembly in civil aviation maintenance site.

Description

Technical Field

[0001] This utility model relates to the field of maintenance tooling technology for pneumatic components of civil aircraft, and in particular to a fixing fixture for assembling the actuator cylinder of a flow control valve. Background Technology

[0002] The flow control valve (part number 396608-1) is a core pneumatic component of the Boeing aircraft air conditioning system, and its actuator contains a high-load spring. During disassembly and assembly, it is necessary to simultaneously fix the housing and keep the connecting rod in the middle position of the bushing. Due to the complex shape of the component and the large spring force, existing general-purpose fixtures cannot simultaneously clamp the housing and support the connecting rod. Maintenance personnel often use manual support, which carries the risk of housing displacement, connecting rod misalignment, and spring flying out, resulting in low assembly efficiency and significant safety hazards. Currently, there is no dedicated fixing fixture for this type of actuator on the market, and there is an urgent need for a simple tooling that can achieve one-time clamping and rapid positioning through static connection of mechanical parts. Utility Model Content

[0003] The purpose of this invention is to provide a fixing fixture for assembling the actuator cylinder of a flow control valve, thereby solving the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A fixing fixture for assembling the actuator cylinder of a flow control valve, comprising:

[0006] A horizontally positioned base;

[0007] Two side adjustment blocks are symmetrically arranged along the longitudinal center line of the base, and the blocks are in sliding fit with the base.

[0008] The side adjusting screws are vertically screwed onto both sides of the base and are used to push the side adjusting clamps to slide laterally. The cylindrical section of the adjusting screw is engaged with the threaded hole of the base, and the end face of the adjusting screw abuts against the ball socket on the side of the adjusting clamp.

[0009] A screw that is vertically screwed in and passes through the central threaded hole of the base has an adjustable support surface formed on the upper end face of the screw head to support the bottom plane of the actuator housing.

[0010] An adjusting support rod is horizontally arranged along the base. The adjusting support rod is a stepped cylinder. Its large end cylindrical surface is clearance-fitted with the horizontal circular hole of the base, and the small end cylindrical section is used to pass through the bushing hole on the left side of the actuator cylinder housing.

[0011] A small screw that is vertically screwed and passes through the wall of the horizontal circular hole in the base can be pressed against the cylindrical surface of the large end of the adjusting support rod, forming a static lock on the adjusting support rod.

[0012] A washer and a fixing nut are sequentially fitted onto the cylindrical section of the small end of the adjusting support rod. The fixing nut is screwed into the external thread of the small end of the adjusting support rod to axially clamp the actuator connecting rod between the washer and the shoulder of the support rod.

[0013] And bolts, which pass through the lug hole of the actuator connecting rod and the transverse through hole of the adjusting support rod, and are locked by the fixing nut and washer to fix the connecting rod relative to the support rod.

[0014] In some specific embodiments, the base is a rectangular aviation 45# steel block with a longitudinal T-shaped groove in the center of the upper surface. The lower part of the side adjustment clamp is provided with a slide rail with the same cross-sectional shape as the T-shaped groove, and the slide rail and the T-shaped groove form a linear sliding pair.

[0015] In some specific embodiments, each side adjustment clamping block has a V-shaped positioning notch on the side facing the center. When the two clamping blocks are closed, they form a diamond-shaped closed cavity, which is used to perform four-point positioning clamping on the outer cylindrical surface of the actuator cylinder shell.

[0016] In some specific embodiments, the side adjusting screw is a knurled cylindrical head screw, with its smooth section fitting with the smooth hole on the side wall of the base, its threaded section engaging with the threaded hole on the side wall of the base, and the ball head at the end of the screw embedded in the ball socket on the side of the clamping block, forming a ball-joint type thrust transmission.

[0017] In some specific embodiments, the screw is a fully threaded cylindrical screw with its axis coinciding with the longitudinal center line of the base. The upper end face of the screw head is a precision-machined plane, used to provide height-adjustable support for the bottom surface of the actuator housing.

[0018] In some specific embodiments, a flat surface is milled on the cylindrical surface of the large end of the adjusting support rod. When the small screw is tightened, its end face directly presses against the flat surface to prevent the support rod from rotating around its own axis.

[0019] In some specific embodiments, the small end cylindrical section of the adjusting support rod is provided with a shoulder, and the end face of the shoulder fits against the end face of the left bushing of the actuating cylinder housing to form a lateral positioning reference.

[0020] In some specific embodiments, the gasket is an aviation standard flat gasket with a clearance fit between its inner hole and the cylindrical section of the small end of the support rod, and its outer diameter is larger than the diameter of the lug hole of the actuator connecting rod, in order to distribute the clamping force.

[0021] In some specific embodiments, the fixing nut is an aviation self-locking nut, whose thread direction is consistent with the external thread of the small end of the support rod, and the end face of the nut fits against the washer to form an axial lock on the connecting rod.

[0022] In some specific embodiments, all parts except standard parts are integrally machined from aviation 45# steel. The base, side adjustment clamps, and adjustment support rods are hardened and precision ground to a hardness ≥ HRC40. The surface roughness Ra of each sliding mating surface is ≤ 0.8μm to ensure repeatability and wear resistance.

[0023] The beneficial effects of this utility model are:

[0024] The static connection completes the positioning of the housing in the lateral, longitudinal and height directions in one go. The connecting rod maintains a fixed angle relative to the housing bushing, requiring no manual support and resulting in high assembly efficiency.

[0025] All positioning forces are borne by the threaded and sliding pairs, requiring no additional power source. The structure is simple and the size is small, making it suitable for carrying at the maintenance site.

[0026] All parts are detachable mechanical connections, and the clamping process is shock-free, eliminating the risk of springs flying out and improving operational safety.

[0027] It uses a combination of standard parts and simple machined parts, resulting in low manufacturing costs and convenient maintenance. It can be directly applied to the maintenance of similar spring-operated cylinders. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the fixture of this utility model;

[0029] Figure 2 This is a structural schematic diagram of the base of this utility model;

[0030] Figure 3 This is a schematic diagram of the side adjustment clamp of this utility model;

[0031] Figure 4 This is a schematic diagram of the side adjusting screw of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the small screw of this utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the adjusting support rod of this utility model.

[0034] Figure 7 This is a structural schematic diagram of the screw of this utility model;

[0035] Figure 8 This is a schematic diagram of another embodiment of the present invention;

[0036] In the attached diagram: 2. Base; 3. Side adjustment clamp; 4. Side adjustment screw; 5. Small screw; 6. Adjustment support rod; 7. Screw; 8. Bolt; 9. Washer; 10. Fixing nut. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0038] Reference Figures 1 to 8 The fixture shown is for assembling the actuator cylinder of a flow control valve, comprising:

[0039] The base 2 is set horizontally;

[0040] Two side adjustment clamps 3 are symmetrically arranged along the longitudinal center line of the base, and the clamps are in sliding fit with the base.

[0041] The side adjusting screws 4 are vertically screwed on both sides of the base and are used to push the side adjusting clamps to slide laterally. The cylindrical section of the adjusting screw is engaged with the threaded hole of the base, and the end face of the adjusting screw abuts against the ball socket on the side of the adjusting clamp.

[0042] The screw 7 is vertically screwed and passes through the central threaded hole of the base. The upper end face of the screw head forms an adjustable support surface for supporting the bottom plane of the actuator housing.

[0043] The adjusting support rod 6 is horizontally arranged along the base. The adjusting support rod is a stepped cylinder. Its large end cylindrical surface is in clearance fit with the horizontal circular hole of the base, and the small end cylindrical section is used to pass through the bushing hole on the left side of the actuator housing.

[0044] A small screw 5, which is vertically screwed and passes through the wall of the transverse circular hole in the base, can be pressed against the cylindrical surface of the large end of the adjusting support rod to form a static lock on the adjusting support rod.

[0045] The washer 9 and the fixing nut 10 are sequentially fitted onto the cylindrical section of the small end of the adjusting support rod. The fixing nut is screwed into the external thread of the small end of the adjusting support rod to axially clamp the actuator connecting rod between the washer and the shoulder of the support rod.

[0046] And bolt 8, the bolt passes through the lug hole of the actuator connecting rod and the transverse through hole of the adjusting support rod, and is locked by the fixing nut and washer to fix the connecting rod relative to the support rod.

[0047] In this embodiment, I. Detailed structural description

[0048] The base 2 is placed horizontally, with a T-shaped through groove machined longitudinally on its upper surface. The bottom of the groove is connected to the side, forming a linear guide rail. Two side adjusting clamping blocks 3 symmetrically straddle the T-shaped groove. The bottom surface of the clamping blocks extends integrally with a slide rail that perfectly matches the cross-section of the T-shaped groove. The slide rail and the groove wall are in a clearance sliding fit, allowing the clamping blocks to only move laterally towards or away from the center line. The other degrees of freedom are constrained by the groove wall. A V-shaped notch is cut on the side of the clamping blocks facing the center. When the two clamping blocks are closed, the two V-shaped surfaces form a rhomboid closed cavity. The four edges of the cavity form four-point contact with the outer circle of the actuating cylinder shell, achieving self-centering clamping.

[0049] The side adjusting screw 4 is screwed horizontally into the left and right side walls of the base: the smooth section of the screw is fitted with the smooth hole of the base to serve as a guide; the threaded section is screwed into the threaded hole of the base to form a spiral feed; the end of the screw is made into a ball head, which is embedded in the ball socket on the side of the clamping block. The diameter of the ball socket is slightly larger than that of the ball head, forming a ball joint, so that the rotational thrust of the screw is transmitted to the clamping block without lateral force, and the clamping block moves smoothly without jamming.

[0050] Screw 7 is screwed vertically into the threaded blind hole from the center of the base bottom surface. The upper end face of the head is a finely ground flat surface, forming a height-adjustable support surface. After the housing is placed in, the screw head directly supports the bottom surface of the housing. The height of the housing can be steplessly adjusted by rotating the screw, so that the housing axis coincides with the center line of the fixture.

[0051] The adjusting support rod 6 is a stepped cylinder. Its large end fits with the transverse circular hole on the upper part of the base, allowing for axial insertion and rotation. A flat surface is milled out of the cylindrical surface of the large end. A small screw 5 is screwed vertically into this flat surface from the top surface of the base. When the small screw is tightened, the flat surface and the end face of the screw form a line contact and lock, preventing the support rod from rotating or moving axially. The outer circle of the small end of the support rod fits with the bushing hole on the left side of the actuator cylinder housing. A shoulder is provided at the root of the small end, and the end face of the shoulder fits against the end face of the bushing, achieving a transverse positioning reference.

[0052] Bolt 8 passes sequentially through the lug hole of the actuator cylinder connecting rod and the transverse through hole of the support rod. A washer 9 is first fitted onto the rod end, followed by tightening the fixing nut 10. The outer diameter of the washer is larger than the lug hole diameter, which distributes the tightening force of the nut to the lug end face. The fixing nut is an aviation self-locking nut, ensuring reliable anti-loosening. After the nut is tightened, the connecting rod is axially clamped between the washer and the shoulder of the support rod, completing the rigid connection between the connecting rod and the support rod.

[0053] II. Dynamic Working Process

[0054] Install the housing: Gently place the actuator housing in the center of the base, with the bottom surface of the housing resting on the head plane of screw 7; Simultaneously rotate the side adjusting screws 4 on both sides, and the clamping block 3 slides synchronously towards the center along the T-shaped groove, with the V-shaped notch holding the outer circle of the housing at four points, thus limiting the horizontal and vertical directions of the housing at once.

[0055] Insert the support rod: Insert the small end of the adjusting support rod 6 into the bushing hole on the left side of the housing until the shaft shoulder is close to the end face of the bushing; make slight horizontal adjustments to the support rod so that its horizontal through hole is coaxial with the connecting rod lug hole, insert the bolt 8 and then put on the washer 9 in sequence, and tighten the fixing nut 10, and the connecting rod is fixedly connected to the support rod.

[0056] Locking and anti-rotation: Tighten the small screw 5, its end face presses against the large end plane of the support rod, the rotation and axial freedom of the support rod are completely constrained, and the connecting rod angle is fixed.

[0057] Disassembly or assembly: At this point, the relative positions of the housing and connecting rod are uniquely determined, and maintenance personnel can safely use spring compression tools to perform subsequent operations on the spring, diaphragm, etc., without having to hold the housing or connecting rod by hand throughout the process.

[0058] Disassembly: Loosen the side adjusting screw 4 in the reverse direction to release the clamp; unscrew the fixing nut 10 and pull out the bolt 8; loosen the small screw 5 and pull out the support rod 6 to remove the assembled actuator cylinder.

[0059] III. Functions

[0060] The fixture uses a purely mechanical static connection to rigidly constrain the housing and connecting rod in four degrees of freedom: lateral, longitudinal, height, and angle, eliminating the risk of displacement caused by spring reaction force. All adjustments are made using threaded screw feed, which has self-locking characteristics and will not loosen under vibration. The disassembly and assembly process does not require an additional power source and can be completed by a single person, significantly improving maintenance efficiency and operational safety.

[0061] In some specific embodiments, the base 2 is a rectangular aviation 45# steel block with a longitudinal T-shaped groove in the center of the upper surface. The lower part of the side adjustment clamp 3 is provided with a slide rail with the same cross-sectional shape as the T-shaped groove, and the slide rail and the T-shaped groove form a linear sliding pair.

[0062] In some specific embodiments, each side adjustment clamp 3 has a V-shaped positioning notch on the side facing the center. When the two clamps are closed, they form a rhomboid closed cavity, which is used to perform four-point positioning clamping on the outer cylindrical surface of the actuator shell.

[0063] In some specific embodiments, the side adjusting screw 4 is a knurled cylindrical head screw, with its smooth section fitting with the smooth hole on the side wall of the base, its threaded section engaging with the threaded hole on the side wall of the base, and the ball head at the end of the screw embedded in the ball socket on the side of the clamping block to form a ball-joint type thrust transmission.

[0064] In some specific embodiments, screw 7 is a fully threaded cylindrical screw with its axis coinciding with the longitudinal center line of base 2. The upper end face of the screw head is a precision-machined plane, used to provide height-adjustable support for the bottom surface of the actuator housing.

[0065] In some specific embodiments, a flat surface is milled on the cylindrical surface of the large end of the adjusting support rod 6. When the small screw 5 is tightened, its end face directly presses against the flat surface to prevent the support rod from rotating around its own axis.

[0066] In some specific embodiments, the small cylindrical section of the adjusting support rod 6 is provided with a shoulder at its root, and the end face of the shoulder fits against the end face of the left bushing of the actuator housing to form a lateral positioning reference.

[0067] In some specific embodiments, the gasket 9 is an aviation standard flat gasket with a clearance fit between its inner hole and the cylindrical section of the small end of the support rod, and its outer diameter is larger than the diameter of the lug hole of the actuator connecting rod, which is used to distribute the clamping force.

[0068] In some specific embodiments, the fixing nut 10 is an aviation self-locking nut, whose thread direction is consistent with the external thread of the small end of the support rod, and the end face of the nut is in contact with the washer 9 to form an axial lock on the connecting rod.

[0069] In some specific embodiments, all parts except standard parts are integrally machined from aviation 45# steel. The base 2, side adjustment clamp 3, and adjustment support rod 6 are hardened and precision ground to a hardness ≥ HRC40. The surface roughness Ra of each sliding mating surface is ≤ 0.8μm to ensure repeatability and wear resistance.

[0070] In this embodiment, I. Structural Details

[0071] The base 2 is made of rectangular 45# aerospace steel block, with a longitudinal T-shaped groove machined through the center of its upper surface. The groove is narrow at the bottom and wide at the opening, forming an inverted T-shaped cross-section. The lower part of the side adjusting clamp 3 extends integrally with a slide rail that has the same cross-section as the T-shaped groove. The slide rail is embedded in the groove, and the side wall and the groove wall maintain a micron-level gap, retaining only the lateral sliding freedom, forming a linear sliding pair. A 90° V-shaped notch is cut on the side of the clamp facing the center. When the two clamps are closed, the two V-shaped surfaces form a rhomboid closed cavity. The four edges of the cavity form four-point contact with the outer circle of the actuator cylinder shell, achieving self-centering clamping and preventing radial movement of the shell.

[0072] The side adjusting screw 4 adopts a knurled cylindrical head structure. The smooth section is fitted with the smooth hole on the side wall of the base to play a guiding role; the threaded section is screwed into the threaded hole on the side wall of the base to form a spiral feed; the end of the screw is made into a ball head, which is embedded in the ball socket on the side of the clamping block. The diameter of the ball socket is slightly larger than that of the ball head, forming a ball joint, so that the rotational thrust of the screw is transmitted to the clamping block without lateral force component, and the clamping block moves smoothly without jamming.

[0073] Screw 7 is a fully threaded cylindrical screw with its axis coinciding with the longitudinal center line of the base. It is screwed into the central threaded blind hole of the base from bottom to top. The upper end face of the screw head is precision ground with a flatness of ≤0.01mm. It is used to support the bottom surface of the actuator cylinder housing. The height of the housing can be steplessly adjusted by rotating the screw to make the housing axis coincide with the center line of the clamp.

[0074] A flat surface is milled on the cylindrical surface of the large end of the adjusting support rod 6, with the width of the flat surface slightly larger than the diameter of the end face of the small screw 5. The small screw is screwed vertically into the wall of the transverse circular hole in the base. After tightening, its end face directly presses against the flat surface, forming a line contact lock to prevent the support rod from rotating around its own axis and to limit axial movement. A shoulder is provided at the root of the cylindrical section of the small end of the support rod. The end face of the shoulder fits against the end face of the bushing on the left side of the actuator cylinder housing, forming a transverse positioning reference to ensure that the insertion depth of the support rod is unique.

[0075] The gasket 9 is an aviation standard flat gasket with a clearance fit between its inner hole and the cylindrical section of the small end of the support rod. Its outer diameter is larger than the diameter of the lug hole of the actuator connecting rod, which can distribute the locking force of the fixing nut 10 to the end face of the lug and avoid local indentation. The fixing nut is an aviation self-locking nut with the thread direction consistent with the external thread of the small end of the support rod. The end face of the nut fits against the gasket to form an axial lock on the connecting rod and prevent loosening.

[0076] All non-standard parts are integrally machined from aviation 45# steel. The base 2, side adjustment clamping block 3, and adjustment support rod 6 are hardened and tempered at low temperature to a hardness ≥ HRC40. The sliding mating surfaces are finely ground to a surface roughness Ra≤0.8μm to ensure repeat clamping accuracy and long service life wear resistance.

[0077] II. Dynamic Working Process

[0078] During clamping, first gently place the actuator housing in the center of the base, with the bottom surface of the housing in contact with the head plane of screw 7. Simultaneously rotate the adjusting screws 4 on both sides, and the clamping block 3 slides synchronously towards the center along the T-slot. The V-shaped notch hugs the outer circle of the housing at four points, thus limiting the housing's lateral and height directions at once. Then, insert the small end of the adjusting support rod 6 into the bushing hole on the left side of the housing until the shoulder is close to the bushing end face. Make slight lateral adjustments to the support rod so that its lateral through hole is coaxial with the connecting rod lug hole. Insert the bolt 8 and then sequentially put on the washer 9 and tighten the fixing nut 10. The connecting rod is then fixed to the support rod. Finally, tighten the small screw 5, whose end face presses against the large end plane of the support rod. The rotational and axial degrees of freedom of the support rod are completely constrained, and the connecting rod angle is fixed. At this point, the relative positions of the housing and the connecting rod are uniquely determined, and maintenance personnel can safely use spring compression tools for subsequent disassembly or assembly without manual assistance. When unloading, loosen the side adjusting screw 4 in the opposite direction to release the clamp; unscrew the fixing nut 10 and pull out the bolt 8; loosen the small screw 5 and pull out the support rod 6 to remove the assembled actuator cylinder.

[0079] III. Functions

[0080] The above embodiments use purely mechanical static connections to simultaneously apply rigid constraints to the housing and connecting rods in four degrees of freedom: lateral, longitudinal, height, and angle, eliminating the risk of displacement caused by high-load spring reaction forces; the threaded pair has a self-locking mechanism that prevents loosening under vibration; the disassembly and assembly process requires no additional power source and can be completed by a single person, significantly improving the assembly efficiency and operational safety at civil aviation maintenance sites.

[0081] The working principle of this utility model can be summarized as follows:

[0082] The five-step closed loop of "screw feed - sliding guide - ball joint force transmission - shoulder positioning - threaded locking" completely encloses the spring reaction force and assembly stress inside the fixture, making the housing and connecting rod form a rigid whole in four dimensions (X, Y, Z, and rotation around X). This enables safe, fast, and repeatable clamping under high-load spring conditions without the aid of any external power.

[0083] The specific process is as follows:

[0084] Helical feed: The side adjusting screw 4 and the threaded hole of the base form a helical pair. Rotating the screw is converted into a transverse linear feed force of the clamping block 3. The ball head of the screw and the ball socket of the clamping block form a ball joint, ensuring that the feed force is always transmitted along the sliding axis of the clamping block without any lateral component force, and the clamping block moves smoothly without jamming.

[0085] Sliding guide: The T-shaped groove of the base and the sliding rail of the clamping block form an inverted T-shaped linear sliding pair, which releases only one degree of freedom in the lateral direction, while the other five degrees of freedom are completely constrained by the groove wall; after the two clamping blocks are closed, the four points of the V-shaped notch press against the outer circle of the shell at the same time to achieve self-centering clamping, and the shell is completely locked in the lateral direction (Y direction) and around the vertical axis (Z direction rotation).

[0086] Height compensation: Screw 7 and the central threaded hole of the base form a second set of helical pairs. Rotating the screw can steplessly raise and lower the bottom surface of the housing, so that the housing axis coincides with the center line of the fixture, and complete the height (Z direction) positioning; the thread helix angle is less than the equivalent friction angle, which has self-locking and does not sink under vibration.

[0087] Lateral reference and angle locking: The small end shoulder of the adjustment support rod 6 fits against the end face of the housing bushing to form a unique lateral X-axis reference; Bolt 8, washer 9, and fixing nut 10 form a threaded locking tie, which presses the connecting rod lug between the support rod shoulder and the washer, so that the connecting rod and the support rod are fixed together; the end face of the small screw 5 presses against the large end plane of the support rod to form a local line contact friction lock, preventing the support rod from rotating around its own axis, thereby locking the angle of the connecting rod around the X-axis.

[0088] Closed-loop force: The axial reaction force generated by the compression or release of the spring is transmitted in a closed loop through the connecting rod → bolt → support rod → shaft shoulder → bushing → housing → clamping block → base. The entire force chain has no exposed moving parts. The operator only needs to rotate the thread to complete the clamping and release, realizing "handless - single tool - disposable" safe operation.

[0089] In summary, the fixture utilizes the self-locking characteristics of multiple sets of helical pairs and the rigid constraints of various planes, shoulders, and ball joints to transform complex three-dimensional spring forces into an internal closed static system. Only a simple external rotation is required to quickly establish a high-precision, high-rigidity assembly benchmark at the maintenance site, enabling the safe and efficient assembly of the flow control valve actuator.

[0090] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0091] Four-dimensional rigid positioning

[0092] By utilizing the linear pair of "T-slot-slide rail", the four-point self-centering of "V-notch", the transverse reference of "shoulder-bushing" and the friction lock of "plane-small screw", the four degrees of freedom of the housing, namely transverse, longitudinal, height and connecting rod rotation, are constrained at the same time. The repeatability of positioning accuracy is ≤0.05mm, which completely solves the problem of housing displacement and connecting rod misalignment caused by high load springs.

[0093] Thread self-locking vibration damping

[0094] All adjustment parts use standard threaded pairs with a helix angle less than the equivalent friction angle, possessing inherent self-locking characteristics; under conditions such as aircraft ground vibration and hammer pressing, the clamping force does not decrease, requiring no additional stop parts, ensuring reliable long-term operation.

[0095] single-tool operation

[0096] The clamping process only requires an open-end wrench to rotate the side adjusting screw and the fixing nut, clamping is completed within 30 seconds and release is completed within 60 seconds, which shortens the assistance time by 80% compared to the traditional manual support method. It can be operated by a single person, reducing the need for manpower.

[0097] Closed force chain ensures safety

[0098] The spring reaction force is transmitted through a closed system of "connecting rod - bolt - support rod - shoulder - housing - clamping block - base", with no exposed moving parts, completely eliminating the risk of the spring flying out and ensuring zero injuries at the maintenance site.

[0099] Modular and low-cost

[0100] Except for bolts, washers, and fixing nuts, which are purchased standard parts, all other parts are machined from the same piece of aviation 45# steel in one piece, with a material utilization rate of >90%; after quenching, the hardness is ≥HRC40, and the sliding surface is precision ground to Ra0.8 μm. They do not need to be replaced during their service life, and the tooling cost is only 1 / 3 of that of similar pneumatic clamps.

[0101] Zero maintenance on site

[0102] With no hydraulic, pneumatic, or electrical control components, and a completely mechanical structure, it eliminates the need for maintenance work such as seal aging, pipeline leakage, and sensor calibration; after use, it only requires wiping to prevent rust, making it suitable for rapid field relocation.

[0103] General-purpose scalable

[0104] By keeping the base and clamping block structure unchanged, and only changing the size of the V-shaped notch or the position of the support rod shoulder, it can be adapted to actuators of different diameters and lengths in the same series, achieving "one mold for multiple uses" and reducing the number of spare parts and capital occupation for airlines.

[0105] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixing clamp for assembling the actuator cylinder of a flow control valve, characterized in that, include: The base is set horizontally (2); Two side adjustment clamps (3) are symmetrically arranged along the longitudinal center line of the base, and the clamps are in sliding fit with the base; A side adjusting screw (4) is vertically screwed onto both sides of the base and is used to push the side adjusting clamp to slide laterally. The cylindrical section of the adjusting screw is engaged with the threaded hole of the base, and the end face of the adjusting screw abuts against the ball socket on the side of the adjusting clamp. A screw (7) that is vertically screwed and passes through the central threaded hole of the base, the upper end face of the screw head forming an adjustable support surface for supporting the bottom plane of the actuator housing; An adjusting support rod (6) is horizontally arranged along the base. The adjusting support rod is a stepped cylinder with its large end cylindrical surface in clearance fit with the horizontal circular hole of the base, and its small end cylindrical section is used to pass through the bushing hole on the left side of the actuator housing. A small screw (5) is vertically screwed and passes through the wall of the transverse circular hole of the base. The end of the small screw can be pressed against the cylindrical surface of the large end of the adjusting support rod to form a static lock on the adjusting support rod. A washer (9) and a fixing nut (10) are sequentially fitted onto the cylindrical section of the small end of the adjusting support rod. The fixing nut is screwed into the external thread of the small end of the adjusting support rod to axially clamp the actuator connecting rod between the washer and the shoulder of the support rod. And bolt (8), which passes through the lug hole of the actuator connecting rod and the transverse through hole of the adjusting support rod, and is locked by the fixing nut and washer to fix the connecting rod relative to the support rod.

2. The fixing clamp according to claim 1, characterized in that: The base (2) is a rectangular aviation 45# steel block with a longitudinal T-shaped groove in the center of the upper surface. The side adjustment clamp (3) has a slide rail with the same cross-sectional shape as the T-shaped groove at the bottom. The slide rail and the T-shaped groove form a linear sliding pair.

3. The fixing clamp according to claim 2, characterized in that: Each side adjustment clamp (3) has a V-shaped positioning notch on the side facing the center. When the two clamps are closed, they form a rhomboid closed cavity, which is used to perform four-point positioning clamping on the outer cylindrical surface of the actuator shell.

4. The fixing clamp according to claim 1, characterized in that: The side adjusting screw (4) is a knurled cylindrical head screw. Its smooth section is fitted with the smooth hole on the side wall of the base, and its threaded section is screwed into the threaded hole on the side wall of the base. The ball head at the end of the screw is embedded in the ball socket on the side of the clamping block to form a ball joint type thrust transmission.

5. The fixing clamp according to claim 1, characterized in that: The screw (7) is a fully threaded cylindrical screw with its axis coinciding with the longitudinal center line of the base (2). The upper end face of the screw head is a precision-machined plane, which is used to provide height-adjustable support for the bottom surface of the actuator housing.

6. The fixing clamp according to claim 1, characterized in that: The large end of the adjusting support rod (6) has a flat surface milled on it. When the small screw (5) is tightened, its end face directly presses against the flat surface to prevent the support rod from rotating around its own axis.

7. The fixing clamp according to claim 6, characterized in that: The small end cylindrical section of the adjusting support rod (6) has a shoulder at its root. The end face of the shoulder fits against the end face of the left bushing of the actuating cylinder housing to form a lateral positioning reference.

8. The fixing clamp according to claim 1, characterized in that: The gasket (9) is an aviation standard flat gasket with a clearance fit between its inner hole and the cylindrical section of the small end of the support rod. Its outer diameter is larger than the diameter of the lug hole of the actuator connecting rod, and it is used to distribute the clamping force.

9. The fixing clamp according to claim 8, characterized in that: The fixing nut (10) is an aviation self-locking nut, whose thread direction is consistent with the external thread of the small end of the support rod, and the end face of the nut is in contact with the washer (9) to form an axial lock on the connecting rod.

10. The fixing clamp according to any one of claims 1 to 9, characterized in that: All parts, except for standard parts, are integrally machined from aviation 45# steel. The base (2), side adjustment clamp (3), and adjustment support rod (6) are hardened and precision ground to a hardness ≥ HRC40. The surface roughness of each sliding mating surface Ra≤0.8μm is to ensure repeatability and wear resistance.

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