Device for measuring adhesive force between ice and sample surface

Abstract

The utility model provides a device for measuring the adhesive force between ice and the surface of a sample. The device comprises a low-temperature simulation box, a rotary testing mechanism and a vibration detection mechanism, wherein the rotary testing mechanism is arranged in the low-temperature simulation box and is used for separating an ice layer from a tested object; the vibration detection mechanism is arranged on the low-temperature simulation box and is used for detecting the impact of the fallen ice layer; the rotation testing mechanism comprises a rotation platform and a bearing part arranged on the rotation platform, and the low-temperature simulation box is provided with a driving assembly used for driving the rotation platform to rotate; the two bearing parts are evenly arranged in the circumferential direction of the rotating platform, and each bearing part is provided with a limiting assembly used for limiting a measured object or a counter weight object. The device for measuring the adhesive force between the ice and the surface of the sample has the advantages of being simple in structure and good in simulation effect, a tested object is good in stability and not prone to shaking or falling off in the testing process, and the device is beneficial for improving the accuracy of a testing result.

Description

Technical Field

[0001] The utility model belongs to the field of measuring ice-covered bonding strength of airfoil blades, in particular to a device for measuring the adhesion between ice and a pattern surface. Background Art

[0002] When an aircraft flies in clouds containing supercooled water droplets, ice will accumulate on the surface of the components. Icing will destroy the aerodynamic shape of the aircraft, have a great impact on the aircraft's maneuverability and stability, and seriously threaten flight safety. According to current research, the main factors affecting ice shedding are the peeling force and shear force between the ice accumulation and the contact surface. Therefore, it is particularly important to study the mechanical properties of ice, especially the adhesion between the ice accumulation and the contact surface.

[0003] At present, there are few methods for measuring ice adhesion and they have defects. For example, the push-pull method: the equipment is too large, making it difficult to accurately control the temperature of the low-temperature chamber; the temperature of the side that is pulled / pushed will rise, and even cause melting on the contact surface between the ice layer and the substrate. Torsion loading method: using this method will cause the ice body to break prematurely; the actual contact area is difficult to determine. Centrifugal method: due to the existence of system errors, the calculation of centrifugal force will produce errors; there is heat exchange when the ice and its substrate sample are taken out of the icing environment. However, since the measurement effect of the centrifugal method is better, it is generally improved and optimized.

[0004] In the existing devices using the centrifugal method, due to the difference between the structure of the object being measured and the wing structure, and the uneven weight distribution of the object being measured on the rotating platform during the centrifugal rotation, the stability of the object being measured is poor during the centrifugal rotation, which in turn makes the calculation of the centrifugal force prone to errors, which is not conducive to improving the accuracy of the test results. Utility Model Content

[0005] In view of this, the utility model aims to provide a device for measuring the adhesion between ice and a sample surface, so as to solve the problem that the stability of the object to be measured is poor during centrifugal rotation in the existing device using the centrifugal method, which affects the accuracy of the test result.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A device for measuring the adhesion between ice and a sample surface comprises a low-temperature simulation box, a rotating test mechanism in the low-temperature simulation box for separating the ice layer from the object to be measured, and a vibration detection mechanism on the low-temperature simulation box for detecting the impact of the detached ice layer; the rotating test mechanism comprises a rotating platform and a bearing member arranged on the rotating platform, the low-temperature simulation box is provided with a driving component for driving the rotating platform to rotate; two bearing members are evenly arranged along the circumference of the rotating platform, and each bearing member is provided with a limiting component for limiting the object to be measured or a counterweight.

[0008] Furthermore, the limiting assembly includes a limiting bolt arranged below the bearing member, the bearing member is provided with a bolt hole cooperating with the limiting bolt, and the measured object and the counterweight are both provided with threaded holes cooperating with the limiting bolt.

[0009] Furthermore, the limit assembly also includes an adjusting member arranged below the supporting member, and the adjusting member is provided with an assembly hole that cooperates with the limit bolt; the adjusting member is vertically slidably installed on the supporting member, and the windward side of the adjusting member is provided with a front contour portion for simulating the front end of the wing, and the leeward side is provided with a rear contour portion for simulating the rear end of the wing, and a limiting gap exists between the front contour portion and the rear contour portion for limiting the object to be measured or the counterweight.

[0010] Furthermore, an adjusting bolt is provided at a position on the adjusting member corresponding to the limiting gap, the adjusting bolt is vertically arranged on the adjusting member, a screw hole matching with the adjusting bolt is provided on the adjusting member, and one end of the adjusting bolt passes through the screw hole and supports the bearing member.

[0011] Furthermore, at least two limiting bolts are evenly arranged along the circumference of the bearing component.

[0012] Furthermore, the vibration detection mechanism includes a vibration sensor provided on the low-temperature simulation box, and a timer connected to the vibration sensor.

[0013] Furthermore, the driving assembly includes a uniform acceleration driver disposed on the low-temperature simulation box, and the rotating platform is connected to an output end of the uniform acceleration driver.

[0014] Furthermore, the bearing member is connected to the rotating platform via a connecting member, one end of the connecting member is connected to the rotating platform, and the other end of the connecting member is connected to the bearing member.

[0015] Furthermore, an openable and closable door is provided on the low-temperature simulation box at a position corresponding to the rotating test mechanism.

[0016] Compared with the prior art, the device for measuring the adhesion between ice and a sample surface described in the utility model has the following advantages:

[0017] The device for measuring the adhesion between ice and the surface of a sample described in the utility model has the advantages of simple structure and good simulation effect. The test object has good stability during the test and is not easy to shake or fall off, which is conducive to improving the accuracy of the test results. By setting the rotating test mechanism in the low-temperature simulation box, the adhesion measurement is carried out in a low-temperature space, there is no heat exchange, and the influence of the external environment on the test results is reduced. At the same time, by setting a vibration detection mechanism on the low-temperature simulation box, the vibration detection mechanism is used to accurately detect the collision time between the detached ice layer and the simulation box. The time detection is more accurate, simple, efficient, and highly repeatable, which is conducive to further improving the accuracy of subsequent adhesion calculations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic structural diagram of a device for measuring the adhesion between ice and a sample surface according to an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a rotating test mechanism in a device for measuring the adhesion between ice and a sample surface according to an embodiment of the utility model;

[0021] Figure 3 An exploded view of a supporting member in a device for measuring adhesion between ice and a sample surface according to an embodiment of the utility model;

[0022] Figure 4 The present invention is a cross-sectional view of a supporting member in a device for measuring the adhesion between ice and a sample surface according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Low temperature simulation box; 2. Door body; 3. Uniform acceleration driver; 4. Controller; 5. Vibration sensor; 6. Timer; 7. Rotating platform; 8. Connectors; 9. Counterweight; 10. Object to be measured; 11. Bearing member; 12. Adjustment member; 13. Limit bolt; 14. Adjustment bolt; 15. Bolt hole; 16. Assembly hole; 17. Screw hole; 18. Front profiling part; 19. Rear profiling part; 20. Limit gap. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] A device for measuring the adhesion between ice and a sample surface, such as Figures 1 to 4 As shown, it includes a low-temperature simulation box 1, a rotating test mechanism in the low-temperature simulation box 1 for separating the ice layer from the object to be tested 10, and a vibration detection mechanism on the low-temperature simulation box 1 for detecting the impact of the detached ice layer; the rotating test mechanism includes a rotating platform 7, and a bearing member 11 on the rotating platform 7 for bearing the object to be tested 10 or the counterweight 9, and the low-temperature simulation box 1 is provided with a driving component for driving the rotating platform 7 to rotate; the bearing members 11 are evenly arranged in two along the circumference of the rotating platform 7, and each bearing member 11 is provided with a limiting component for limiting the object to be tested 10 or the counterweight 9.

[0030] Optionally, the carrier 11 is connected to the rotating platform 7 via a connecting member 8, wherein one end of the connecting member 8 is connected to the rotating platform 7, and the other end is connected to the carrier 11. Exemplarily, one end of the connecting member 8 is fixed to the rotating platform 7, and the other end is fixed to the carrier 11. By connecting the carrier 11 and the rotating platform 7 with the connecting member 8, the carrier 11 can be arranged away from the center of the rotating platform 7, which is conducive to increasing the centrifugal force on the object 10 under test at the carrier 11, thereby accelerating the test progress.

[0031] Optionally, a door body 2 that can be opened and closed is provided at a position corresponding to the rotating test mechanism on the low-temperature simulation box 1. Exemplarily, the door body 2 can be rotatably installed on the low-temperature simulation box 1 through hinges or hinges. By providing the door body 2 that can be opened and closed, it is not only convenient for operators to install and maintain the rotating test mechanism in the low-temperature simulation box 1, but also helps to reduce the impact of the external environment on the environment inside the low-temperature simulation box 1.

[0032] The above-mentioned limiting assembly includes a limiting bolt 13 arranged below the bearing member 11, the bearing member 11 is provided with a bolt hole 15 matched with the limiting bolt 13, and the object to be measured 10 and the counterweight 9 are both provided with threaded holes matched with the limiting bolt 13. Exemplarily, the object to be measured 10 and the counterweight 9 can be respectively arranged on the two bearing members 11, and the object to be measured 10 and the counterweight 9 have the same shape and the same mass, so as to balance the weight on both sides of the rotating platform 7, which is conducive to improving the stability of the rotating platform 7 during the rotation process, thereby ensuring that the object to be measured 10 remains stable during the centrifugal rotation process, and improving the accuracy of the test results.

[0033] Optionally, at least two limiting bolts 13 are evenly arranged along the circumference of the carrier 11. Exemplarily, two, three, four or more limiting bolts 13 can be evenly arranged, and the corresponding carrier 11 is also correspondingly provided with multiple bolt holes 15, and the object to be measured 10 and the counterweight 9 are also correspondingly provided with multiple threaded holes. By providing multiple limiting bolts 13, the object to be measured 10 and the counterweight 9 are limited and fixed by using multiple limiting bolts 13, which is conducive to further improving the stability of the object to be measured 10 or the counterweight 9 on the carrier 11, and preventing the object to be measured 10 or the counterweight 9 from separating from the carrier 11 during the rotation process.

[0034] In actual application, existing refrigeration or constant temperature equipment can also be installed on the low-temperature simulation box 1 to better simulate the environment after the wing is iced, which is conducive to further improving the accuracy of the test results.

[0035] Optionally, the limiting assembly also includes an adjusting member 12 arranged below the supporting member 11, and the adjusting member 12 is provided with an assembly hole 16 that cooperates with the limiting bolt 13; the adjusting member 12 is vertically slidably installed on the supporting member 11, and the windward side of the adjusting member 12 is provided with a front contoured portion 18 for simulating the front end of the wing, and the leeward side is provided with a rear contoured portion 19 for simulating the rear end of the wing, and there is a limiting gap 20 between the front contoured portion 18 and the rear contoured portion 19 for limiting the object to be measured 10 or the counterweight 9.

[0036] Exemplarily, the shapes of the front profiling portion 18 and the rear profiling portion 19 can simulate the shape of the wing, so that the air flow received by the object under test 10 is closer to the air flow at the wing, which is conducive to improving the authenticity of the test. By setting a limiting gap 20 for limiting the object under test 10 or the counterweight 9 between the front profiling portion 18 and the rear profiling portion 19, the cooperation between the limiting gap 20 and the limiting object under test 10 or the counterweight 9 can not only further improve the stability of the limiting object under test 10 or the counterweight 9 when the bearing member 11 rotates, but also make the surface of the object under test 10 or the counterweight 9 and the adjusting member 12 smoothly transition, so as to better simulate the influence of the air flow on the wing surface on the ice layer on the object under test 10.

[0037] In actual application, by setting an assembly hole 16 on the adjusting member 12 that cooperates with the limiting bolt 13, the limiting bolt 13 can also be used to fix the adjusting member 12, thereby preventing the adjusting member 12 from falling off during the rotation of the supporting member 11, and ensuring that the adjusting member 12 can continue to limit the object to be measured 10 or the counterweight 9.

[0038] Optionally, an adjusting bolt 14 is provided at a position on the adjusting member 12 corresponding to the limiting gap 20, the adjusting bolt 14 is vertically arranged on the adjusting member 12, a screw hole 17 cooperating with the adjusting bolt 14 is provided on the adjusting member 12, and one end of the adjusting bolt 14 passing through the screw hole 17 is supported against the bearing member 11. Exemplarily, the adjusting bolt 14 can be arranged corresponding to the middle of the bearing member 11, so that the operator can adjust the position of the adjusting member 12 through the adjusting bolt 14.

[0039] In actual application, the operator can first place the object to be measured 10 or the counterweight 9 on the bearing member 11, and then screw the adjusting bolt 14, and use the adjusting bolt 14 to cooperate with the screw hole 17 on the adjusting member 12 to adjust the height of the adjusting member 12, so that when the adjusting bolt 14 is against the lower surface of the bearing member 11, the upper surface of the adjusting member 12 is flush with the upper surface of the object to be measured 10 or the counterweight 9. Finally, the operator can use the limit bolt 13 to fix the adjusting member 12, the object to be measured 10 or the counterweight 9, which is very easy to operate and helps to prevent the ice layer on the object to be measured 10 from melting due to heat, thereby ensuring the accuracy of subsequent test results.

[0040] Optionally, the vibration detection mechanism includes a vibration sensor 5 provided on the low temperature simulation box 1, and a timer 6 connected to the vibration sensor 5. Exemplarily, both the vibration sensor 5 and the timer 6 can be fixed on the low temperature simulation box 1 by screws. Among them, both the vibration sensor 5 and the timer 6 can adopt existing equipment, and the power supply control methods of the vibration sensor 5 and the timer 6 are also existing technologies, so they are not repeated here.

[0041] In actual application, the vibration sensor 5 can be used to detect the impact of the detached ice layer on the low-temperature simulation box 1, and the timer 6 can be used to record the time when the detached ice layer hits the low-temperature simulation box 1, so as to facilitate subsequent calculations.

[0042] Optionally, the driving component includes a uniform acceleration driver 3 provided on the low temperature simulation box 1, and the rotating platform 7 is connected to the output end of the uniform acceleration driver 3. Exemplarily, the uniform acceleration driver 3 can adopt an existing stepper motor, and the stepper motor can be controlled by an stm32 controller to achieve uniform acceleration rotation. Among them, the fixed end of the stepper motor can be fixed on the low temperature simulation box 1 by screws, and the output end can be connected to the rotating platform 7 by a transmission shaft or a coupling. Those skilled in the art can also select other suitable uniform acceleration drivers 3 and their installation methods according to actual needs to achieve uniform acceleration rotation of the rotating platform 7, which will not be repeated here.

[0043] In the actual application process, the device also includes a controller 4 set on the low-temperature simulation box 1, and the vibration sensor 5, timer 6, and uniform acceleration driver 3 are all connected to the controller 4. Among them, the controller 4 can adopt the existing stm32 controller, and the vibration sensor 5 and timer 6 are connected to the stm32 controller by existing serial communication and other methods to realize data transmission and control, which will not be repeated here. In actual use, the vibration sensor 5, timer 6, and uniform acceleration driver 3 can be controlled by the controller to start synchronously, and according to the collision detection signal of the vibration sensor 5, the vibration sensor 5, timer 6, and uniform acceleration driver 3 can be controlled to stop working, thereby realizing accurate timing from the start of the rotation of the rotating platform to the time when the ice layer falls off, so as to facilitate subsequent calculations.

[0044] This device can be tested using the following steps:

[0045] First, weigh the mass of the object to be measured and the ice layer, select a suitable counterweight 9, and ensure that it has the same mass as the counterweight 9. After that, freeze and adhere the ice layer to the object to be measured. Then turn on the power supply of the refrigeration equipment on the low-temperature simulation box 1, and lower the temperature in the low-temperature simulation box 1 to below zero degrees. Then quickly fix the object to be measured and the counterweight 9 on the two bearings 11 on the rotating platform 7, and cool them. Finally, use the uniform acceleration driver 3 to drive the rotating platform 7 to rotate, so that it rotates uniformly, and use the timer 6 to record the time when the ice layer falls off (the uniform acceleration driver 3 can be connected to the timer 6 through the controller 4 to achieve synchronous start. When the falling ice layer hits the inner wall, the vibration sensor 5 receives the vibration signal, and the controller 4 can be used to stop the timing of the timer 6. At this time, the acceleration time of the rotating platform 7 can be obtained, which is then used to calculate the rotation speed of the rotating platform 7 at this time).

[0046] Specifically, during actual testing, the adhesion strength of the ice layer can be calculated according to the following formula:

[0047] Among them, m is the mass of the ice layer, ω is the rotation speed, r is the distance from the object to be measured to the rotation center of the rotating platform, based on the centrifugal force F of the ice on the object to be measured, the adhesion strength of the material σ, a is the acceleration, and t is the acceleration time.

[0048] The device for measuring the adhesion between ice and the surface of a sample described in the utility model has the advantages of simple structure and good simulation effect. The test object has good stability during the test and is not easy to shake or fall off, which is conducive to improving the accuracy of the test results. By setting the rotating test mechanism in the low-temperature simulation box, the adhesion measurement is carried out in a low-temperature space, there is no heat exchange, and the influence of the external environment on the test results is reduced. At the same time, by setting a vibration detection mechanism on the low-temperature simulation box, the vibration detection mechanism is used to accurately detect the collision time between the detached ice layer and the simulation box. The time detection is more accurate, simple, efficient, and highly repeatable, which is conducive to further improving the accuracy of subsequent adhesion calculations.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring the adhesion between ice and a sample surface, characterized in that: The invention comprises a low temperature simulation box (1), a rotating test mechanism in the low temperature simulation box (1) for separating an ice layer from an object to be tested (10), and a vibration detection mechanism on the low temperature simulation box (1) for detecting the impact of a falling ice layer; the rotating test mechanism comprises a rotating platform (7), and a bearing member (11) arranged on the rotating platform (7); the low temperature simulation box (1) is provided with a driving component for driving the rotating platform (7) to rotate; two bearing members (11) are evenly arranged along the circumference of the rotating platform (7), and each bearing member (11) is provided with a limiting component for limiting the object to be tested (10) or the counterweight (9).

2. A device for measuring the adhesion between ice and a sample surface according to claim 1, characterized in that: The limiting assembly comprises a limiting bolt (13) arranged below the bearing member (11); the bearing member (11) is provided with a bolt hole (15) cooperating with the limiting bolt (13); and the measured object (10) and the counterweight (9) are both provided with threaded holes cooperating with the limiting bolt (13).

3. A device for measuring the adhesion between ice and a sample surface according to claim 2, characterized in that: The limiting assembly further comprises an adjusting member (12) arranged below the bearing member (11), wherein the adjusting member (12) is provided with an assembly hole (16) matched with the limiting bolt (13); the adjusting member (12) is vertically slidably mounted on the bearing member (11), the windward surface of the adjusting member (12) is provided with a front profiling portion (18) for simulating the front end of a wing, and the leeward surface is provided with a rear profiling portion (19) for simulating the rear end of a wing, and a limiting gap (20) for limiting the position of a measured object (10) or a counterweight (9) is provided between the front profiling portion (18) and the rear profiling portion (19).

4. A device for measuring the adhesion between ice and a sample surface according to claim 3, characterized in that: An adjusting bolt (14) is provided on the adjusting member (12) at a position corresponding to the limiting gap (20); the adjusting bolt (14) is vertically arranged on the adjusting member (12); a screw hole (17) matching with the adjusting bolt (14) is provided on the adjusting member (12); one end of the adjusting bolt (14) passes through the screw hole (17) and abuts against the bearing member (11).

5. A device for measuring the adhesion between ice and a sample surface according to any one of claims 2 to 4, characterized in that: At least two of the limiting bolts (13) are evenly arranged along the circumference of the bearing member (11).

6. The device for measuring the adhesion between ice and a sample surface according to claim 1, characterized in that: The vibration detection mechanism comprises a vibration sensor (5) arranged on the low-temperature simulation box (1), and a timer (6) connected to the vibration sensor (5).

7. The device for measuring the adhesion between ice and a sample surface according to claim 1, characterized in that: The driving component comprises a uniform acceleration driver (3) arranged on a low-temperature simulation box (1), and the rotating platform (7) is connected to an output end of the uniform acceleration driver (3).

8. The device for measuring the adhesion between ice and a sample surface according to claim 1, characterized in that: The bearing member (11) is connected to the rotating platform (7) via a connecting member (8); one end of the connecting member (8) is connected to the rotating platform (7), and the other end is connected to the bearing member (11).

9. The device for measuring the adhesion between ice and a sample surface according to claim 1, characterized in that: The low-temperature simulation box (1) is provided with an openable and closable door body (2) at a position corresponding to the rotary test mechanism.

Images