A loading mechanism for life test of actuator

Abstract

The present invention provides a loading mechanism for the life test of an actuator, which belongs to the field of aviation product testing technology. The entire loading mechanism has a simple principle, including a set of gears and slide rails and a pin connection mechanism. When the piston rod of the actuator is extended or retracted, its mounting pin can rotate around its center point at different angles according to the displacement change of the actuator to simulate the actual use state. By replacing different gear radii and adding conversion formulas, different angle requirements can be achieved. The present invention has a simple calculation method and is easy to adjust, which can effectively improve the test control accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation product testing, and in particular relates to a loading mechanism for an actuator life test. Background Art

[0002] Before any aircraft model is put on the market, aircraft actuator life test is an indispensable test content, which is mainly used to evaluate the comprehensive performance of the actuator, such as wear resistance, sealing and working reliability. With the increasingly stringent test requirements of the main engine, most of the current actuator tests need to simulate the real state, that is, when the actuator is extended or retracted, its pin shaft must also rotate with the change of displacement, and the rotation angle is determined according to the displacement. This also puts higher requirements on the life test of the actuator, so it is necessary to design a set of coordinated loading mechanisms to solve this problem.

[0003] For better understanding, refer to Figure 1 The schematic diagram of the conventional actuator structure further explains the function and test content of the actuator. The actuator piston rod end 13 and the actuator outer cylinder end 14 form a retractable structure through internal sealing rings and other structures. The oil inlet 11 and the oil return port 12 are extended or retracted by external pressure supply. The piston rod end pin rotation center 15 and the outer cylinder end pin rotation center 16 are connected to the outside through the pin. When extending or retracting, the pin needs to rotate around the center point in coordination with the displacement change. Summary of the invention

[0004] The purpose of the present invention is to provide a loading mechanism for life test of an actuator to solve the technical problem of follow-up rotation of the actuator pin.

[0005] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] A loading mechanism for an actuator life test, the loading mechanism for an actuator life test comprising a vertical test bench, a top surface of the test bench being provided with a slide rail extending along the length direction of the test bench, a connecting seat being provided on the slide rail, the connecting seat being able to slide along the slide rail, an actuator being fixed to the outside of one end of the test bench during the test, and a piston rod end of the actuator being connected to the connecting seat;

[0007] A rack extending along the length direction of the test bench is arranged on each of the two sides of the bottom of the test bench, and each of the two racks is meshed with a gear, and the two gears are mounted on a pin shaft, and the pin shaft passes through the connecting seat and the piston rod end of the actuator cylinder.

[0008] Therefore, when the piston rod of the actuator is extended or retracted, it pushes the connecting seat to move on the slide rail, and the connecting seat drives the gears on both sides to move on the rack, so that the pin shaft can rotate around its center point at different angles according to the displacement change of the actuator to simulate the actual usage status.

[0009] Furthermore, a loading cylinder is fixed to the other end of the test bench, the piston rod end of the loading cylinder is connected to the connecting seat, the pin shaft passes through the connecting seat, the piston rod end of the loading cylinder and the piston rod end of the actuator, and the piston rod end of the loading cylinder is a U-shaped connecting end.

[0010] Therefore, the loading cylinder and the actuator are connected by a rotating pin to achieve bidirectional running-in of tension and compression. When the loading cylinder is driven in both tension and compression, the gear moves accordingly along the rack, and the pin connected to the gear is driven to move along the slide rail. Since the gear and the outer end of the pin are connected by a flange, the pin rotates with the gear, so the pin will rotate along the axis of the bottom end of the actuator piston rod to achieve the test purpose and simulate the life test of the actuator under load conditions.

[0011] Furthermore, the top surface of the test bench is provided with two slide rails located on both sides of the actuator and extending along the length direction of the test bench, each of the slide rails is provided with a connecting seat, the upper part of the connecting seat is provided with a through hole, the pin shaft passes through the two through holes in turn, and connects the piston rod end of the actuator and the piston rod end of the loading cylinder located between the two connecting seats.

[0012] Furthermore, a first stopper and a second stopper are provided between the two gears, and both ends of the first stopper and the second stopper are correspondingly mounted on the gears; the first stopper is arranged above the horizontal plane where the pin shaft is located, and the second stopper is arranged below the horizontal plane where the pin shaft is located, so as to play the role of supporting, balancing and limiting the gears.

[0013] In addition, the racks are divided into various height models and are detachably arranged on both sides of the bottom of the test bench to facilitate the adjustment of the meshing after the gears are replaced.

[0014] In addition, the connecting seat is divided into various height models and can be detachably arranged on the slide rail to facilitate the adjustment of the meshing after the gear is replaced.

[0015] Based on the same inventive concept, the present invention also provides a method for conducting an experiment using the above-mentioned loading mechanism for the actuator life test, which is characterized by comprising the following steps:

[0016] Step 1: Obtain the displacement value of the piston rod extension or retraction according to the actuator to be tested L .

[0017] Step 2: Set the rotation center angle of the pin to be tested to .

[0018] Step 3: Calculate the radius of the experimental gear using the parameters of steps 1 and 2. r , the calculation formula is: .

[0019] Step 4: According to the radius calculated in step 3 r A gear for experiment is obtained and mounted on a loading mechanism, and the gear is meshed with the rack by adjusting the position of the rack and / or the connecting seat.

[0020] Step 5: Install the actuator outside one end of the test bench, and the pin shaft passes through the connecting seat and the piston rod end of the actuator; start the actuator to complete the simulation experiment under no-load conditions.

[0021] Step six, based on step five, install the loading cylinder outside the other end of the test bench, the pin shaft passes through the through holes of the two connecting seats in sequence, and connects the piston rod end of the actuator located between the two connecting seats and the end of the loading cylinder; start the loading cylinder to complete the simulation experiment under load.

[0022] The loading mechanism for the life test of an actuator of the present invention has the following advantages:

[0023] 1) Radius of the experimental gear r The calculation is simple, and only needs to be converted according to the radian of the central angle of rotation of the pin shaft to be tested and the displacement value of the piston rod extended or retracted of the actuator to be tested.

[0024] 2) It has strong versatility and is connected to external gears of different radii through pins. The gears move axially through the fixed guide rails below to meet the requirements of different actuators and rotation angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the conventional actuator structure;

[0026] Figure 2 It is a side view structural schematic diagram of the present invention;

[0027] Figure 3 It is a schematic diagram of the top view structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the connecting seat structure of the present invention.

[0029] Explanation of markings in the figure: 1. Gear; 2. Loading cylinder; 3. Slide rail; 41. First limit piece; 42. Second limit piece; 5. Pin; 6. Actuator; 7. Rack; 8. Connecting seat; 9. Test bench; 11. Oil inlet; 12. Oil return port; 13. Actuator piston rod end; 14. Actuator outer cylinder end; 15. Piston rod end pin rotation center; 16. Outer cylinder end pin rotation center. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0031] The present invention provides a loading mechanism for an actuator life test, such as Figure 2 and Figure 4 As shown, it includes a vertical test bench 9, the top surface of the test bench 9 is provided with a slide rail 3 extending along the length direction of the test bench 9, and the slide rail 3 is provided with a connecting seat 8, and the connecting seat 8 can slide along the slide rail 3. During the experiment, an actuator 6 is fixed to the outside of one end of the test bench 9, and the piston rod end of the actuator 6 is connected to the connecting seat 8. A loading cylinder 2 is fixed to the other end of the test bench 9, and the piston rod end of the loading cylinder 2 is connected to the connecting seat 8. Specifically, the connecting seat 8 is divided into a variety of height models, and can be detachably arranged on the slide rail 3.

[0032] Specifically, Figure 3 As shown, the upper end surface of the test bench 9 is provided with slide rails 3 located on both sides of the actuator 6 and extending along the length direction of the test bench 9, each of the slide rails 3 is provided with a connecting seat 8, and a through hole is provided on the upper part of the connecting seat 8. The pin 5 passes through two through holes in sequence and connects the piston rod end of the actuator 6 and the piston rod end of the loading cylinder 2 located between the two connecting seats 8. The loading cylinder 2 and the actuator 6 are connected by the pin 5 to achieve bidirectional running-in of tension and compression. After the connecting seat 8 is combined with the slide rail 3, the pin 5 is connected to play a guiding role.

[0033] like Figure 2 As shown, a rack 7 extending along the length direction of the test bench 9 is provided on each side of the bottom of the test bench 9. Specifically, the rack 7 is divided into multiple height models and is detachably provided on both sides of the bottom of the test bench 9. Figure 3 As shown, each of the two racks 7 is meshed with a gear 1, and the two gears 1 are mounted on the same pin 5, and the pin 5 passes through the connecting seat 8 and the piston rod end of the actuator 6. After the gear 1 and the rack 7 are assembled, they are matched and connected with the center of the pin 5 and the connecting seat 8, so that the gear 1 and the rack 7 are meshed.

[0034] like Figures 2 to 4 As shown, a first stopper 41 and a second stopper 42 are provided between the two gears 1, and both ends of the first stopper 41 and the second stopper 42 are correspondingly mounted on the gears 1, and the first stopper 41 is arranged above the horizontal plane where the pin shaft 5 is located, and the second stopper 42 is arranged below the horizontal plane where the pin shaft 5 is located. The first stopper 41 and the second stopper 42 play the role of support, balance and limit.

[0035] When the loading cylinder 2 is driven in both pulling and pressing directions, the gear 6 moves accordingly along the rack 7, and the pin 5 connected to the gear 6 is driven to move along the slide rail 3. Since the gear 6 is connected to the outer end of the rotating pin 5 through a flange, the rotating pin 5 will rotate along the axis of the bottom end of the piston rod of the actuator 6.

[0036] The loading mechanism for the life test of the actuator provided by the present invention comprises the following steps when used:

[0037] Step 1: Obtain the displacement value of the piston rod extending or retracting according to the actuator 6 to be tested L 500 mm .

[0038] Step 2: Set the rotation center angle of the pin to be tested to is 20.

[0039] Step 3: Calculate the radius of the experimental gear 1 using the parameters of steps 1 and 2. r , the calculation formula is:

[0040] .

[0041] Step 4: According to the radius value calculated in step 3, the radius of the experimental gear 1 is 25 mm and set the radius to 25 mm The gear 1 is mounted on the loading mechanism, and the gear 1 is meshed with the rack 7 by adjusting the rack 7 and / or the connecting seat 8 .

[0042] Step 5: Install the actuator 6 described in step 1 and step 4 at one end of the test bench 9 to complete the simulation experiment under no-load condition.

[0043] Step six, based on step five, the loading cylinder 2 is installed at the other end of the test bench 9 to complete the simulation experiment under load.

[0044] The present invention proposes a loading mechanism for an actuator life test. By studying the actuator test requirements that the pins installed at both ends need to be rotated at different angles, a coordinated loading mechanism is designed. The pins are rotated at different angles in a simple and convenient manner to truly simulate the use status of the aircraft actuator and meet the test rotation angle requirements.

[0045] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A loading mechanism for an actuator life test, comprising a vertical test bench (9), wherein the top surface of the test bench (9) is provided with a slide rail (3) extending along the length direction of the test bench (9), and the slide rail (3) is provided with a connecting seat (8), and the connecting seat (8) can slide along the slide rail (3). During the test, an actuator (6) is fixed to the outside of one end of the test bench (9), and the piston rod end of the actuator (6) is connected to the connecting seat (8); characterized in that: A rack (7) extending along the length direction of the test bench (9) is arranged on each of the two sides of the bottom of the test bench (9), and each of the two racks (7) is meshed with a gear (1). The two gears (1) are mounted on a pin shaft (5), and the pin shaft (5) passes through a connecting seat (8) and a piston rod end of an actuator cylinder (6).

2. The loading mechanism for the life test of the actuator according to claim 1, characterized in that: A loading cylinder (2) is fixed to the other end of the test bench (9), the end of the loading cylinder (2) is connected to the connecting seat (8), and the pin shaft (5) passes through the connecting seat (8), the piston rod end of the loading cylinder (2) and the piston rod end of the actuator (6).

3. The loading mechanism for the life test of the actuator according to claim 2, characterized in that: The top surface of the test bench (9) is provided with two slide rails (3) located on both sides of the actuator (6) and extending along the length direction of the test bench (9), each of the slide rails (3) is provided with a connecting seat (8), and a through hole is provided on the upper part of the connecting seat (8). The pin shaft (5) passes through the two through holes in sequence and connects the piston rod end of the actuator (6) located between the two connecting seats (8) and the piston rod end of the loading cylinder (2).

4. The loading mechanism for the life test of the actuator according to claim 2 or 3, characterized in that: The piston rod end of the loading cylinder (2) is a U-shaped connection end.

5. The loading mechanism for the life test of the actuator according to any one of claims 1 to 3, characterized in that: A first limiting member (41) and a second limiting member (42) are provided between the two gears (1), and both ends of the first limiting member (41) and the second limiting member (42) are correspondingly mounted on the gears (1); the first limiting member (41) is arranged above the horizontal plane where the pin shaft (5) is located, and the second limiting member (42) is arranged below the horizontal plane where the pin shaft (5) is located.

6. The loading mechanism for the life test of the actuator according to any one of claims 1 to 3, characterized in that: The racks (7) are divided into various height models and are detachably arranged on both sides of the bottom of the test bench (9).

7. The loading mechanism for the life test of the actuator according to any one of claims 1 to 3, characterized in that: The connecting seat (8) is divided into various height models and can be detachably arranged on the slide rail (3).

8. A method for conducting an experiment using the loading mechanism for an actuator life test according to any one of claims 1 to 7, characterized in that: The steps include: Step 1, obtaining a displacement value L of the piston rod extending or retracting according to the actuator (6) to be tested; Step 2, setting the arc number of the rotation center angle of the pin shaft to be tested to α; Step 3: Calculate the radius r of the experimental gear (1) using the parameters of step 1 and step 2. The calculation formula is: Step 4: obtaining the experimental gear (1) according to the radius r calculated in step 3, and installing the gear (1) on the loading mechanism, and making the gear (1) mesh with the rack (7) by adjusting the position of the rack (7) and / or the connecting seat (8); Step 5: Install the actuator (6) outside one end of the test bench (9), and pass the pin (5) through the connecting seat (8) and the piston rod end of the actuator (6); start the actuator (6) to complete the simulation experiment under no-load condition; Step six, on the basis of step five, the loading cylinder (2) is installed outside the other end of the test bench (9), a through hole is provided on the upper part of the connecting seat (8), the pin shaft (5) passes through the through holes of the two connecting seats (8) in sequence, and the piston rod end of the actuator (6) located between the two connecting seats (8) is connected to the end of the loading cylinder (2); start the loading cylinder (2) to complete the simulation experiment under load conditions.

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