A test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder

Abstract

This application relates to the field of mechanical testing equipment technology, and provides a test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder, comprising: a base plate, on which a first mounting seat, a fixed baffle, and a second mounting seat are sequentially and fixedly fixed; the first mounting seat is used to mount a friction clutch-end hydraulic cylinder, and the second mounting seat is used to mount a mechanical locking end hydraulic cylinder; a first movable baffle is provided on the piston rod of the friction clutch-end hydraulic cylinder, and a force sensor is provided on the first movable baffle, with a first spring between the force sensor and the fixed baffle; a second movable baffle is provided on the piston rod of the mechanical locking end hydraulic cylinder, with a second spring between the second movable baffle and the fixed baffle; a laser displacement sensor for measuring the displacement of the second movable baffle is provided on the base plate. Non-contact ranging is achieved through the laser displacement sensor, solving the problem of installing sensors on hollow hydraulic cylinders in the prior art, while laser ranging has the advantage of high measurement accuracy.

Description

Technical Field

[0001] This application belongs to the field of mechanical testing equipment technology, and more specifically, relates to a test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder. Background Technology

[0002] In the process of disengaging and engaging the high-power active control clutch of a certain helicopter, a hollow hydraulic cylinder is required for operation.

[0003] During the operation of the actuator, the friction clutch end needs to apply a predetermined clamping force accurately, and the mechanical locking end needs to overcome the working resistance and complete the preset displacement.

[0004] This necessitates the design of a hydraulic test bench capable of testing clamping force and output displacement.

[0005] In the field of hydraulic system testing, test benches for measuring the displacement and output thrust of hollow hydraulic cylinders under axial load conditions are key equipment to ensure the reliability of hydraulic cylinder performance.

[0006] Existing hydraulic cylinder testing technologies mainly rely on static load testing methods, such as vertically arranging the hydraulic cylinder and adding a load. Although this method is simple, it cannot achieve dynamic load adjustment.

[0007] For displacement measurement, dial indicators or LVDT sensors are used. However, mechanical dial indicators or LVDT sensors are easily affected by mechanical vibrations, and the hollow structure of hollow hydraulic cylinders makes sensor installation face space limitations and signal transmission challenges. Thrust measurement is usually calculated indirectly by a pressure sensor installed in the hydraulic station. On the one hand, the influence of friction and inertial forces is not considered, and on the other hand, conversion errors are introduced during the calculation process, resulting in insufficient measurement accuracy. Utility Model Content

[0008] To address one of the shortcomings of the prior art, the purpose of this application is to provide a test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder.

[0009] To achieve the above objectives, the technical solution adopted in this application is: to provide a test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder, comprising: a base plate, wherein a first mounting seat, a fixed baffle, and a second mounting seat are sequentially and spaced apart on the base plate; the first mounting seat is used to mount the friction clutch end hydraulic cylinder, and the second mounting seat is used to mount the mechanical locking end hydraulic cylinder;

[0010] The piston rod of the hydraulic cylinder at the friction clutch end is provided with a first movable baffle, the first movable baffle is provided with a force sensor, and a first spring is provided between the force sensor and the fixed baffle.

[0011] The piston rod of the mechanical locking end hydraulic cylinder is provided with a second movable baffle, and a second spring is provided between the second movable baffle and the fixed baffle;

[0012] The base plate is equipped with a laser displacement sensor for measuring the displacement of the second movable baffle.

[0013] In one embodiment, the fixed baffle is provided with a receiving cylinder on each of its two sides, and one end of the first spring or the second spring is installed inside the receiving cylinder, while the other end protrudes from the end face of the receiving cylinder.

[0014] In one embodiment, the second movable baffle is provided with a laser baffle that cooperates with the laser displacement sensor.

[0015] In one embodiment, the base plate has two parallel support frames between the first mounting base and the second mounting base. Each support frame is provided with a guide rail, and each guide rail is provided with a first slider and a second slider. The two first sliders are respectively connected to the first movable baffle through a first connecting block, and the two second sliders are respectively connected to the second movable baffle through a second connecting block.

[0016] In one embodiment, a third slider is provided on one of the guide rails, the laser displacement sensor is disposed on the third slider, and the laser baffle is disposed on the second slider and located on the same guide rail as the laser displacement sensor.

[0017] In one embodiment, the laser baffle is detachably mounted on the first slider, or the laser baffle is detachably mounted on the second slider;

[0018] One laser displacement sensor is provided and is detachably mounted on the third slider.

[0019] In one embodiment, both the first slider and the second slider are provided with laser baffles, and two laser displacement sensors are provided, each facing the corresponding laser baffle to measure distance.

[0020] In one embodiment, both the first connecting block and the second connecting block are L-shaped connecting blocks.

[0021] The beneficial effects of the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in this application are as follows:

[0022] 1. By setting up a laser displacement sensor to measure the displacement of the hydraulic cylinder at the friction clutch end, the non-contact ranging method solves the problem of installing sensors on hollow hydraulic cylinders in the existing technology. At the same time, laser ranging has the advantage of high measurement accuracy. Simultaneously, by using a force sensor to directly measure the force and synchronizing the material force and displacement data with the laser displacement sensor, a displacement-force phase characteristic spectrum is directly constructed, avoiding the conversion error in the traditional indirect pressure conversion and ensuring measurement accuracy.

[0023] 2. By using the first and second springs to simulate the deformation of the friction plates and the axial load during the clutch operation, the test data are made closer to the real working conditions. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in an embodiment of this application;

[0026] Figure 2 The structural schematic diagram of the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in the embodiments of this application omits the first mounting base, the second mounting base, the friction clutch end hydraulic cylinder, and the mechanical locking end hydraulic cylinder.

[0027] Figure 3 A schematic diagram of the structure of the first or second mounting base in the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in the embodiments of this application;

[0028] Figure 4 A schematic diagram of the structure of the fixed baffle in the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder, as provided in the embodiments of this application;

[0029] Figure 5 A schematic diagram of the support frame in the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder, provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure in which the second connecting block fixes the second movable baffle and the second slider in the test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in the embodiments of this application.

[0031] The following are the labeling elements in the figure:

[0032] 1. Base plate; 2. First mounting seat; 3. Fixed baffle; 4. Second mounting seat; 5. Friction clutch end hydraulic cylinder; 6. Mechanical locking end hydraulic cylinder; 7. First movable baffle; 8. Force sensor; 9. First spring; 10. Second movable baffle; 11. Second spring; 12. Laser displacement sensor; 13. Receiving cylinder; 14. Laser baffle; 15. Support frame; 16. Guide rail; 17. First slider; 18. Second slider; 19. First connecting block; 20. Second connecting block; 21. Third slider. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] like Figures 1-6As shown in the illustration, a test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder provided in this application will now be described. This test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder includes: a base plate 1, a first mounting base 2, a fixed baffle 3, and a second mounting base 4. The first mounting base 2, the fixed baffle 3, and the second mounting base 4 are all fixed to the base plate 1 by multiple bolts at intervals. The first mounting base 2 is used to mount a friction clutch-end hydraulic cylinder 5, and the second mounting base 4 is used to mount a mechanical locking end hydraulic cylinder 6. Both the friction clutch-end hydraulic cylinder 5 and the mechanical locking end hydraulic cylinder 6 are hollow hydraulic cylinders and are the test objects of this test bench.

[0038] In this embodiment, a first movable baffle 7 is provided on the piston rod of the hydraulic cylinder 5 at the friction clutch end, and a force sensor 8 is provided on the first movable baffle 7. The force sensor 8 is a flange-type pressure sensor 8. A first spring 9 is provided between the force sensor 8 and the fixed baffle 3. The piston rod moves synchronously with the first movable baffle 7 and the force sensor 8. The two ends of the first spring 9 abut against the force sensor 8 and the fixed baffle 3 respectively, and can be used to measure the axial load of the thrust measurement.

[0039] In this embodiment, a second movable baffle 10 is provided on the piston rod of the mechanical locking end hydraulic cylinder 6, and a second spring 11 is provided between the second movable baffle 10 and the fixed baffle 3; the two ends of the second spring 11 abut against the second movable baffle 10 and the fixed baffle 3 respectively, and the second movable baffle 10 moves synchronously with the piston rod. A laser displacement sensor 12 is provided on the base plate 1 for measuring the displacement of the second movable baffle 10. The displacement of the second movable baffle 10 is directly and non-contactly measured using the laser displacement sensor 12, thereby determining the displacement of the piston rod of the mechanical locking end hydraulic cylinder 6. Alternatively, the laser displacement sensor 12 can also be used to measure the displacement of the first movable baffle 7.

[0040] In this embodiment, for positioning and installing the spring, a receiving cylinder 13 is provided on each of the two sides of the fixed baffle 3. One end of the first spring 9 or the second spring 11 is installed in the corresponding receiving cylinder 13, and the other end protrudes from the end face of the receiving cylinder 13. This ensures that the first spring 9 can abut against the force sensor 8, and the second spring 11 abuts against the second movable baffle 10. When the first spring 9 is fully compressed, an axial load can be applied by using the end face of the receiving cylinder 13 to abut against the force sensor 8.

[0041] In one embodiment, the second movable baffle 10 is provided with a laser baffle 14 that cooperates with the laser displacement sensor 12. The laser baffle 14 moves synchronously with the second movable baffle 10. Therefore, the displacement of the laser baffle 14 measured by the laser displacement sensor 12 is equivalent to the displacement of the second movable baffle 10.

[0042] In this embodiment, to reduce the impact of the gravity of the first movable baffle 7 and the force sensor 8 on the piston rod of the friction clutch-end hydraulic cylinder 5, and to reduce the impact of the action of the second movable baffle 10 on the piston rod of the mechanical locking end hydraulic cylinder 6, the base plate 1 is provided with two parallel support frames 15 between the first mounting base 2 and the second mounting base 4. Each support frame 15 includes two parallel support beams and multiple support vertical beams spaced apart between the two support beams. Each support frame 15 is provided with a guide rail 16, and each guide rail 16 is provided with a first slider 17 and a second slider 18. The two first sliders 17 are respectively connected to the first movable baffle 7 via a first connecting block 19, and the two second sliders 18 are respectively connected to the second movable baffle 10 via a second connecting block 20. The weight of the first movable baffle 7 and the force sensor 8 is supported by the first slider 17 via the first connecting block 19, and the weight of the second movable baffle 10 is supported by the second slider 18 via the second connecting block 20. The first connecting block 19 and the second connecting block 20 are both L-shaped connecting blocks. The first connecting block 19 is connected to the first slider 17 and the first movable baffle 7 by screws or bolts, and the second connecting block 20 is connected to the second slider 18 and the second movable baffle 10 by screws or bolts.

[0043] In this embodiment, a third slider 21 is also provided on one of the guide rails 16. The third slider 21 is located between the first slider 17 and the second slider 18. The laser displacement sensor 12 is disposed on the third slider 21, and the laser baffle 14 is disposed on the second slider 18 and is located on the same guide rail 16 as the laser displacement sensor 12. In this way, the laser displacement sensor 12 and the laser baffle 14 are on the same straight line.

[0044] During the experiment, the displacement of the first movable baffle 7 can also be measured using the laser displacement sensor 12. Therefore, in one embodiment, the laser baffle 14 is detachably mounted on the first slider 17, or the laser baffle 14 is detachably mounted on the second slider 18; one laser displacement sensor 12 is provided and detachably mounted on the third slider 21. Specifically, both the laser baffle 14 and the laser displacement sensor 12 are detachably fixed by screws, or detachably fixed by magnetic attraction, such as installing magnets at the bottom of both the laser baffle 14 and the laser displacement sensor 12, and fixing magnetic materials such as magnets or iron sheets on the slider.

[0045] In another embodiment, both the first slider 17 and the second slider 18 are provided with laser baffles 14, and two laser displacement sensors 12 are provided, each facing the corresponding laser baffle 14 to measure distance. In this way, the laser baffles 14 can be fixed on the first slider 17 or the second slider 18, and the two laser displacement sensors 12 are fixed on the third slider 21.

[0046] In this embodiment, a laser displacement sensor 12 is used to measure the displacement of the movable baffle connected to the piston rod. On the one hand, the external installation method avoids the problem of installing the sensor in the hollow hydraulic cylinder, and on the other hand, the absolute accuracy is higher, reaching 0.1FS.

[0047] A spring and a fixed baffle 3 are used in combination, wherein the second spring 11 simulates the axial load and the first spring 9 simulates the deformation of the friction plate.

[0048] During displacement testing: Laser displacement sensors 12 and laser baffles 14 are installed on the guide rails 16 on both sides. When the hydraulic cylinder pushes the movable baffle, the laser displacement sensors 12 measure the displacement of the movable baffle through the laser baffles 14 on the guide rails 16, and the displacement is fed back into the control signal of the servo valve. When the input displacement reaches the predetermined displacement, the controller controls the hydraulic cylinder to remain stationary.

[0049] During pressure testing: Force sensor 8 is installed between fixed baffle 3 and first movable baffle 7. The output pressure of hydraulic cylinder is obtained by measuring the pressure of first movable baffle 7. When the output pressure reaches the preset value, the controller controls the hydraulic cylinder to remain stationary.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A test bench for measuring displacement and output thrust of a hollow hydraulic cylinder, characterized in that, include: A base plate (1) is provided with a first mounting seat (2), a fixed baffle (3), and a second mounting seat (4) fixedly fixed on the base plate (1) at intervals; the first mounting seat (2) is used to install the friction clutch end hydraulic cylinder (5), and the second mounting seat (4) is used to install the mechanical locking end hydraulic cylinder (6); The piston rod of the hydraulic cylinder (5) at the friction clutch end is provided with a first movable baffle (7), the first movable baffle (7) is provided with a force sensor (8), and a first spring (9) is provided between the force sensor (8) and the fixed baffle (3); The piston rod of the mechanical locking end hydraulic cylinder (6) is provided with a second movable baffle (10), and a second spring (11) is provided between the second movable baffle (10) and the fixed baffle (3); The base plate (1) is provided with a laser displacement sensor (12) for measuring the displacement of the second movable baffle (10).

2. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 1, characterized in that: The fixed baffle (3) is provided with a receiving cylinder (13) on both sides. One end of the first spring (9) or the second spring (11) is installed in the receiving cylinder (13), and the other end protrudes from the end face of the receiving cylinder (13).

3. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 2, characterized in that: The second movable baffle (10) is provided with a laser baffle (14) that cooperates with the laser displacement sensor (12).

4. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 3, characterized in that: The base plate (1) has two parallel support frames (15) between the first mounting base (2) and the second mounting base (4). Each support frame (15) is provided with a guide rail (16), and each guide rail (16) is provided with a first slider (17) and a second slider (18). The two first sliders (17) are respectively connected to the first movable baffle (7) through a first connecting block (19), and the two second sliders (18) are respectively connected to the second movable baffle (10) through a second connecting block (20).

5. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 4, characterized in that: One of the guide rails (16) is also provided with a third slider (21), the laser displacement sensor (12) is provided on the third slider (21), and the laser baffle (14) is provided on the second slider (18) and is located on the same guide rail (16) as the laser displacement sensor (12).

6. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 5, characterized in that: The laser baffle (14) is detachably mounted on the first slider (17), or the laser baffle (14) is detachably mounted on the second slider (18); The laser displacement sensor (12) is provided and is detachably mounted on the third slider (21).

7. The test bench for measuring displacement and output thrust of a hollow hydraulic cylinder according to claim 5, characterized in that: Both the first slider (17) and the second slider (18) are provided with laser baffles (14), and two laser displacement sensors (12) are provided and are respectively facing the corresponding laser baffles (14) to measure distance.

8. The test bench for measuring the displacement and output thrust of a hollow hydraulic cylinder as described in claim 5, characterized in that: Both the first connecting block (19) and the second connecting block (20) are L-shaped connecting blocks.

Images