Actuator cylinder load test fixture

Abstract

The utility model discloses a kind of actuating cylinder load test fixtures, belong to civil aviation seat repair technical field.Jig is composed of support seat, locating screw, support block, reinforcing strip and several fastening screws;Support seat is " " shape frame, and half-round gap is set to embrace actuating cylinder outer circle, and locating screw is symmetrically screwed in to realize radial accurate positioning;Two pieces of "U" shape support block are with triangular reinforcing rib, and are laterally fixedly connected with test bench, and form high-rigidity bridge type support;"Z" shape reinforcing strip is attached to the upper surface of support seat by countersunk screw, and constitutes upper chord closed section, and significantly suppresses bending deformation under large load;Each part is detachably thread-connected, and realizes quick assembly and disassembly.The utility model solves the problem that the positioning reference of traditional scattered jig is not the same, the base is easy to deform, and the assembly and disassembly is complicated, has the advantages of accurate positioning, high rigidity, fast operation, and strong universality, and is suitable for load test of various aviation seat actuating cylinder.

Description

Technical Field

[0001] This utility model relates to the field of civil aircraft seat repair technology, and in particular to an actuator load test fixture. Background Technology

[0002] Currently, actuator cylinder components must undergo load testing to verify whether their extension and rotational speed under rated load meet performance specifications. However, existing technologies lack dedicated fixing devices that directly match the test bench, typically employing temporary clamps and bolted assembly methods, which have the following drawbacks:

[0003] Inconsistent clamping datum leads to large repeatability errors and discrete test data.

[0004] Under heavy load conditions, the base is prone to deformation, which may cause component damage or test failure.

[0005] The disassembly and assembly process is cumbersome, and the maintenance cycle is long.

[0006] Therefore, there is an urgent need for a test fixture that is simple in structure, accurate in positioning, reusable, and can protect the components. Utility Model Content

[0007] The purpose of this invention is to provide an actuator cylinder load testing fixture, thereby solving the aforementioned problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An actuator load test fixture includes:

[0010] Support base, which is a plate-shaped base, is used to fix the component to the load test bench;

[0011] Locating screws are threaded onto the support base and are used to position the components.

[0012] Support blocks, which are block-shaped bodies, are symmetrically arranged and fastened to the lower surface of the support base, and are used to fix the support base to the test bench.

[0013] Reinforcing strips are long strip-shaped plates that are fitted onto the upper surface of the support base and fastened to it to increase overall rigidity.

[0014] Fastening screws are used to secure components to a support.

[0015] In some specific embodiments, the support base includes three flat plates: a left support plate, a right support plate, and a base plate. The left and right support plates are both vertical rectangular flat plates with a semi-circular notch on the upper edge of each plate. The two notches symmetrically enclose the outer circle of the component. Each plate has two horizontal through holes for the positioning screws to be screwed in horizontally. The base plate is a horizontal rectangular flat plate with countersunk through holes at the four corners for connection to the test bench. The upper surface has positioning grooves and longitudinal threaded blind holes for fitting the left and right support plates, connecting reinforcing strips, and fastening screws, respectively. The three plates are perpendicular to each other and form a "└┘" shaped frame.

[0016] In some specific embodiments, the number of positioning screws is at least two, arranged symmetrically and vertically along the longitudinal centerline of the support, and their external threads form a detachable threaded connection with the threaded holes on the support.

[0017] In some specific embodiments, the support block is a U-shaped cross-section block, with two countersunk through holes on the horizontal wing that are tightly fixed to the lower surface of the support base plate, and two transverse through holes on the vertical wing for bolts to be laterally connected to the test bench, and triangular reinforcing ribs on the inner side of both wings.

[0018] In some specific embodiments, there are two support blocks, which are arranged symmetrically along the transverse side of the support base, so that the support base and the test table form a parallel and spaced positioning relationship.

[0019] In some specific embodiments, the reinforcing strip is Z-shaped, with its length direction aligned with the transverse direction of the support base. Its plate surface is attached to the upper surface of the support base, and both ends are clamped and fixed to the support base by fastening screws.

[0020] In some specific embodiments, the reinforcing strip is provided with a countersunk hole coaxial with the threaded hole of the support seat to accommodate the head of the fastening screw, so that the upper surface of the screw head is not higher than the upper surface of the reinforcing strip.

[0021] In some specific embodiments, a groove is provided at the top of the left support plate for securing one end of the reinforcing strip.

[0022] The beneficial effects of this utility model are:

[0023] The actuator load test fixture of this utility model adopts a minimalist design principle, which not only saves the time of debugging the equipment before load testing, but also saves the time of disassembly after the test fails. This reduces the error generated during component installation and ensures the overall reliability of the components after assembly.

[0024] The component is mounted onto the test bench using the actuator load test fixture. Based on the working principle of load testing, the same principle effect as direct connection to the test bench is achieved by using this fixture to perform load testing on the actuator, which effectively improves production efficiency and enhances the reliability of actuator repair. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the actuator cylinder load test fixture of this utility model;

[0026] Figure 2 This is a three-dimensional structural schematic diagram of the actuator cylinder load testing fixture of this utility model;

[0027] Figure 3 This is a schematic diagram of the positioning screw of the actuator load test fixture of this utility model;

[0028] Figure 4 This is a schematic diagram of the reinforcing strip of the actuator load test fixture of this utility model;

[0029] Figure 5 This is a schematic diagram of the left view of the support base of the actuator load test fixture of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the right view of the actuator load test fixture support base of this utility model;

[0031] Figure 7 This is a schematic diagram of the support block of the actuator load test fixture support base of this utility model;

[0032] Figure 8 This is a schematic diagram of another embodiment of the support block of the actuator load test fixture support base of this utility model.

[0033] In the attached diagram, 1 is the support base; 2 is the positioning screw; 3 is the support block; 4 is the reinforcing strip; 5 is the first fastening screw; 6 is the second fastening screw; 7 is the third fastening screw; 8 is the fourth fastening screw; and 9 is the fifth fastening screw. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0035] Reference Figures 1 to 8 The actuator load test fixture shown includes:

[0036] Support base 1, which is a plate-shaped base, is used to fix the component to the load test bench;

[0037] Positioning screw 2 is threaded onto support base 1 and is used to position the component.

[0038] Support block 3, which is a block-shaped body, is symmetrically arranged and fastened to the lower surface of support base 1, and is used to fix support base 1 to test table.

[0039] Reinforcing strip 4 is a long strip plate that is fitted onto the upper surface of support base 1 and fastened to support base 1 to increase overall rigidity;

[0040] Fastening screws, including: first fastening screw 5, second fastening screw 6, third fastening screw 7, fourth fastening screw 8, and fifth fastening screw 9, which pass vertically through the corresponding through holes on the reinforcing strip 4 and the support base 1, respectively, to fasten the component to the support base 1 as a whole.

[0041] The second fastening screw 6 also serves as an additional fixing connection between the component and the test bench.

[0042] In some specific embodiments, the support base 1 includes three flat plates: a left support plate, a right support plate, and a base plate. The left and right support plates are both vertical rectangular flat plates with a semi-circular notch on each upper edge. The two notches symmetrically enclose the outer circle of the component. Each plate has two transverse through holes for the positioning screws 2 to be screwed in horizontally. The base plate is a horizontal rectangular flat plate with countersunk through holes at the four corners for connection to the test bench. Its upper surface has positioning grooves and longitudinal threaded blind holes for fitting the left and right support plates, the connecting reinforcing strip 4, and the first fastening screw 5, the second fastening screw 6, the third fastening screw 7, the fourth fastening screw 8, and the fifth fastening screw 9, respectively. The three plates are perpendicular to each other, forming a...

[0043] A “└┘” shaped frame.

[0044] In some specific embodiments, the number of positioning screws 2 is at least two, which are arranged symmetrically and vertically along the longitudinal center line of the support 1, and their external threads form a detachable threaded connection with the threaded holes on the support 1.

[0045] In some specific embodiments, the support block 3 is a U-shaped cross-section block, with two countersunk through holes on the horizontal wing and tightly fixed to the lower surface of the support base 1 base plate, and two transverse through holes on the vertical wing for bolts to be laterally connected to the test bench, and triangular reinforcing ribs on the inner side of both wings.

[0046] In some specific embodiments, there are two support blocks 3, which are arranged symmetrically along the side of the support base 1, so that the support base 1 and the test table form a parallel and spaced positioning relationship.

[0047] In some specific embodiments, the reinforcing strip 4 is Z-shaped, with its length direction aligned with the transverse direction of the support base 1. Its plate surface is attached to the upper surface of the support base 1, and both ends are clamped and fixed to the support base 1 by fastening screws.

[0048] In some specific embodiments, the reinforcing strip 4 is provided with a countersunk hole coaxial with the threaded hole of the support seat 1, which is used to accommodate the head of the fastening screw, so that the upper surface of the screw head is not higher than the upper surface of the reinforcing strip 4.

[0049] In some specific embodiments, a groove is provided at the top of the left support plate for securing one end of the reinforcing strip.

[0050] I. For the structure and dynamic working process of positioning screw 2, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3

[0051] Positioning screws 2 are key functional components for achieving precise positioning of the parts. At least two screws are used, arranged symmetrically and vertically along the longitudinal centerline of the support base 1. These screws have external threads, forming a detachable threaded connection with pre-drilled threaded holes on the support base 1. During actual assembly, the operator places the actuator component to be tested within the "└┘" shaped frame of the support base 1, ensuring its outer surface aligns with the semi-circular notches on the upper edges of the left and right support plates. Then, by screwing in the positioning screws 2, their front ends press against the outer surface of the component, achieving radial positioning and initial fixation.

[0052] During dynamic operation, when the load test bench applies axial or radial loads, the positioning screw 2, through the preload provided by its thread pair, continuously resists the slight displacement tendency of the component, preventing it from shifting or rotating during the test. Because the screws are symmetrically arranged along the longitudinal centerline, their positioning force is evenly distributed, effectively avoiding component tilting or eccentric loading problems caused by unilateral force, ensuring the repeatability and accuracy of test data. After the test, simply unscrewing the positioning screw 2 in the reverse direction allows for quick release of the component, achieving efficient assembly and disassembly.

[0053] II. See the structure and dynamic working process of support block 3. Figure 1 , Figure 2 , Figure 7 , Figure 8

[0054] The support block 3 has a U-shaped cross-section. Its horizontal wing section has two countersunk through holes, which are fixed to the lower surface of the support base 1 base plate by fasteners to form a rigid connection. The vertical wing section has two transverse through holes for bolts to pass through, so as to achieve a lateral connection with the test bench. To enhance the structural rigidity, triangular reinforcing ribs are provided on the inner side of the two wings to form a local reinforcement structure, which effectively resists bending moment and shear force.

[0055] During dynamic operation, when support base 1 bears a large load, support block 3 acts as a force transmission intermediary, decomposing and transferring the vertical load and lateral inertial force from the component to the test bench. Its "U"-shaped structure not only provides vertical support but also forms an anti-overturning moment through lateral bolt connections, preventing support base 1 from shifting laterally or warping during testing. The two support blocks 3 are arranged symmetrically along the lateral side of support base 1, forming a "bridge" support structure that ensures that support base 1 and the test bench maintain a parallel and spaced positioning relationship, avoiding test errors caused by uneven bottom surfaces or uneven local stress.

[0056] III. For the structural and dynamic working process of Section 4, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 4 , Figure 5

[0057] The reinforcing strip 4 adopts a "Z" shaped cross-section design, extending laterally along the support base 1 in the length direction. Its lower plate surface is tightly fitted to the upper surface of the support base 1, and both ends are clamped and fixed to the support base 1 by fastening screws such as the first fastening screw 5 and the third fastening screw 7. The reinforcing strip 4 is provided with countersunk holes coaxial with the threaded holes of the support base 1 to accommodate the heads of the fastening screws, ensuring that the upper surface of the screw head is not higher than the upper surface of the reinforcing strip 4, thus avoiding interference with the installation of components.

[0058] During dynamic operation, when the load test bench applies a high load to the actuator cylinder, the middle part of the support base 1 is prone to slight deflection due to bending moment. At this time, the reinforcing strip 4, as the upper surface reinforcement component, effectively improves the overall bending stiffness of the support base 1 through the bending section modulus formed by its "Z"-shaped cross-section. The fixing method at both ends forms a "tension beam" effect, dispersing local stress to a larger area and suppressing deformation expansion. In addition, a groove is provided at the top of the left support plate to hold one end of the reinforcing strip 4, forming a dual function of positioning and limiting, preventing the reinforcing strip from lateral slippage under vibration or impact loads, and ensuring structural stability.

[0059] IV. Synergistic Effect and Overall Dynamic Response

[0060] During the test, the positioning screw 2, the support block 3, and the reinforcing strip 4 work together to form a closed-loop force flow path of "positioning-support-reinforcement".

[0061] Positioning stage: Positioning screw 2 enables rapid and accurate positioning of the component and establishes the initial geometric datum;

[0062] Support stage: Support block 3 firmly connects support base 1 to test bench, forming a stable support base to resist overturning and slippage caused by external loads;

[0063] Strengthening stage: Strengthening strip 4 enhances the bending resistance of support seat 1, suppresses structural deformation under large loads, and protects components from unexpected stress.

[0064] This collaborative mechanism not only significantly improves the repeatability and structural rigidity of the test fixture, but also effectively shortens the assembly and disassembly time, reduces the test failure rate caused by clamping errors, and achieves an efficient and reliable actuator load testing process.

[0065] The working principle of this utility model is as follows:

[0066] The actuator cylinder load testing fixture of this utility model is based on a four-in-one working mechanism of "rigid support—precise positioning—uniform load-bearing—rapid assembly and disassembly" to achieve efficient load testing of actuator cylinder components in civil aviation seats. Its working principle can be divided into four stages:

[0067] Phase 1: Baseline Establishment and Component Positioning

[0068] The entire fixture is connected to the test bench via support block 3 and lateral bolts to form a stable support reference. The "└┘" shaped frame structure of support base 1 is vertically fixed to the test bench through countersunk holes in the base plate, establishing a rigid reference plane. Subsequently, the actuator cylinder component is placed in the semi-circular arc-shaped notches of the left and right support plates, and symmetrically arranged positioning screws 2 are screwed in, so that their front ends press against the outer circle of the component, achieving precise radial positioning, eliminating degrees of freedom, and ensuring that the component axis coincides with the loading axis of the test bench.

[0069] Phase Two: Structural Strengthening and Preload

[0070] After the component is positioned, a Z-shaped reinforcing strip 4 is installed on the upper surface of the support base 1, and both ends are clamped and fixed to the support base 1 by fastening screws such as the first fastening screw 5 and the third fastening screw 7. The Z-shaped cross-section of the reinforcing strip 4 significantly improves the bending section modulus of the support base 1, forming an "upper chord reinforcement" effect to resist bending deformation generated during subsequent load testing. At the same time, the countersunk hole design ensures that the screw heads do not protrude from the surface, avoiding interference with the component installation space.

[0071] Phase 3: Load Application and Force Transmission

[0072] The test bench begins to apply axial or radial loads, which are transmitted to support base 1 via the actuating cylinder component. At this point, the force flow path is: component → positioning screw 2 → support base 1 → support block 3 → test bench. The "U"-shaped structure of support block 3, in conjunction with the triangular reinforcing ribs, decomposes the vertical load into vertical pressure and lateral shear force, which are then transmitted to the test bench frame via transverse bolts, preventing support base 1 from overturning or slipping. The reinforcing strip 4 suppresses the bending deformation in the middle of support base 1 caused by bending moment, maintaining the structural geometric stability.

[0073] Phase 4: Test Completion and Quick Reset

[0074] After the load test is completed, the component can be quickly released by unscrewing the positioning screw 2 and the fastening screw in the opposite direction. Since all connections are detachable threaded pairs and the positioning reference is guaranteed by the support base 1 structure itself, no recalibration is required during repeated clamping, significantly shortening the maintenance cycle. Throughout the process, the fixture achieves the goals of low deformation, high precision, and quick assembly / disassembly testing under heavy loads through the design of "rigid frame + local reinforcement + symmetrical positioning".

[0075] In summary, this utility model, through integrated structural design and optimized force flow path, transforms the traditional piecemeal clamping into a modular, standardized, and repeatable testing scheme, effectively solving problems such as inconsistent clamping benchmarks, easy deformation of the base, and low disassembly and assembly efficiency, and significantly improving the reliability and production efficiency of actuator load testing.

[0076] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0077] Integrated positioning reference solidification

[0078] The support base, positioning screws, and semi-circular notch form a built-in reference, eliminating the need for additional alignment during each clamping, thus eliminating human error and ensuring consistent positioning.

[0079] Significantly improved resistance to deformation

[0080] The "Z"-shaped reinforcing strip and the base plate form a closed cross section for clamping from top to bottom. Even under heavy loads, the fixture body remains straight, preventing the base from bending and pulling on components, thus avoiding test distortion.

[0081] Direct and reliable force transmission

[0082] The "U"-shaped load-bearing wall of the support block and the lateral bolts introduce vertical and lateral loads into the test bench simultaneously. The force path is short and the stress is dispersed, so it remains stable and does not loosen even after long-term high-load operation.

[0083] The disassembly and assembly process is extremely simple and quick.

[0084] All connections are threaded or slotted, allowing for assembly and disassembly with hand tools, saving time spent repeatedly adjusting pressure plates and shims, and significantly shortening the maintenance cycle.

[0085] Built-in error prevention structure

[0086] Details such as countersunk holes and top grooves define the installation posture, eliminating the need for operators to memorize directions. The device can be inserted correctly on the first try, preventing quality issues such as reverse installation or tilting.

[0087] Modular design ensures good compatibility

[0088] The three core modules can be replaced or expanded independently. By using local inserts, it can adapt to actuators with different outer diameters and lengths, achieving multiple uses with one clamp and reducing tooling inventory and capital investment.

[0089] 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 load testing fixture for an actuator cylinder, characterized in that, include: Support base (1), the support base (1) is a plate-shaped base, used to fix the component to the load test bench; Positioning screw (2), which is threadedly mounted on support base (1) for positioning the component; Support block (3), the support block (3) is a block-shaped body, symmetrically arranged and fastened to the lower surface of support base (1), used to fix support base (1) to test table; Reinforcing strip (4), the reinforcing strip (4) is a long strip plate, which is attached to the upper surface of the support base (1) and fastened to the support base (1) to increase the overall rigidity; Fastening screws (5, 6, 7, 8, 9), which are used to fasten the component to the support base (1) as a whole.

2. The actuator cylinder load test fixture according to claim 1, characterized in that: The support base (1) includes three flat plates: a left support plate, a right support plate, and a base plate. The left and right support plates are vertical rectangular flat plates with a semi-circular notch on the upper edge. The two notches symmetrically enclose the outer circle of the component. Each plate has two horizontal through holes for the positioning screws (2) to be screwed in horizontally. The base plate is a horizontal rectangular flat plate with countersunk through holes at the four corners for connection to the test bench. The upper surface has a positioning groove and a longitudinal threaded blind hole, which are used to fit the left and right support plates and the connecting reinforcing strip (4) and fastening screws (5, 6, 7, 8, 9), respectively. The three plates are perpendicular to each other to form a "└┘" shaped frame.

3. The actuator cylinder load test fixture according to claim 2, characterized in that: The number of positioning screws (2) is at least two, arranged symmetrically and vertically along the longitudinal center line of the support (1), and their external threads form a detachable threaded connection with the threaded holes on the support (1).

4. The actuator cylinder load test fixture according to claim 1, characterized in that: The support block (3) is a U-shaped cross-section block. The horizontal wing has two countersunk through holes that are tightly connected to the lower surface of the support base (1) base plate. The vertical wing has two transverse through holes for bolts to be connected to the test bench laterally. The inner sides of the two wings are reinforced with triangular ribs.

5. The actuator cylinder load test fixture according to claim 4, characterized in that: The number of support blocks (3) is two, which are arranged symmetrically along the support base (1) to form a parallel interval positioning relationship between the support base (1) and the test table.

6. The actuator cylinder load test fixture according to claim 2, characterized in that: The reinforcing strip (4) is Z-shaped, and its length direction is consistent with the transverse direction of the support base (1). Its plate surface is attached to the upper surface of the support base (1), and both ends are clamped and fixed to the support base (1) by fastening screws.

7. The actuator cylinder load test fixture according to claim 6, characterized in that: The reinforcing strip (4) is provided with a countersunk hole coaxial with the threaded hole of the support seat (1) to accommodate the head of the fastening screw, so that the upper surface of the screw head is not higher than the upper surface of the reinforcing strip (4).

8. The actuator cylinder load test fixture according to claim 6, characterized in that: The top of the left support plate has a groove for securing one end of the reinforcing strip.

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