An ice adhesion strength measuring device and measuring method

Abstract

The application discloses an ice adhesion strength measuring device and a measuring method, and belongs to the technical field of ice adhesion strength measurement. The measuring device comprises an inner circular arc guide rail, an outer circular arc guide rail, an icing mold, an action line, a tension sensor, a first movable part, a second movable part and a turning part. The outer circular arc guide rail is coaxially sleeved outside the inner circular arc guide rail, the icing mold is fixedly connected with the inner circular arc guide rail, the icing mold is provided with an icing chamber, the icing chamber can be in contact with the surface of a sample to be measured, the first movable part is movably installed on the inner circular arc guide rail, the second movable part is movably installed on the outer circular arc guide rail, the turning part is fixedly arranged, one end of the action line is fixed to the first movable part, the other end is arranged around the second movable part and the turning part and is connected with the tension sensor, and the first movable part can move along the inner circular arc guide rail under the driving of the action line. The position of the action line is adjusted, the ice adhesion strength at any angle is measured, and the measurable angle range of the ice adhesion strength is expanded.

Description

Technical Field

[0001] This invention relates to the field of ice adhesion strength measurement technology, and in particular to an ice adhesion strength measuring device and method. Background Technology

[0002] The adhesion strength of ice to a solid surface can be defined as tangential, normal, and adhesion strength at any angle between tangential and normal directions. The adhesion strength values ​​of ice vary greatly in different directions.

[0003] Accurate measurement of ice adhesion strength is an important foundation for the development of anti-icing and de-icing technology. However, the current method for measuring ice adhesion strength generally adopts the push-pull method, which has two problems: (1) The measurement accuracy of ice adhesion strength is poor. For example, due to the limitations of the measurement method, when using the push-ice method to measure the tangential ice adhesion strength, there is always a certain distance between the contact position of the push rod and the ice layer and the solid surface. This makes the ice-solid interface subject to both tangential pushing force and torque at the same time, so the measured value is not the true tangential ice adhesion strength. (2) It can only measure the tangential or normal adhesion strength between ice and solid through the action of pushing or pulling, but cannot measure the ice adhesion strength value at any angle between tangential and normal. Summary of the Invention

[0004] The purpose of this application is to provide an ice adhesion strength measuring device and method to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide an ice adhesion strength measuring device, including an inner arc guide rail, an outer arc guide rail, an icing mold, an action line, a tensile sensor, a first movable member, a second movable member, and a steering member; the outer arc guide rail is coaxially sleeved outside the inner arc guide rail, the icing mold is fixedly connected to the inner arc guide rail, the icing mold is provided with an icing chamber, the icing chamber can contact the surface of the sample to be tested, the first movable member is movably installed on the inner arc guide rail, the second movable member is movably installed on the outer arc guide rail and detachably connected to the outer arc guide rail, the steering member is fixedly installed, one end of the action line is fixed to the first movable member, and the other end is sequentially wound around the second movable member and the steering member, and connected to the tensile sensor; the first movable member can move along the inner arc guide rail under the drive of the action line, so as to be radially aligned with the second movable member along the outer arc guide rail, and the extension line of the action line passes through the geometric center of the opening end face of the icing chamber near the sample to be tested.

[0007] Secondly, embodiments of this application provide a method for measuring ice adhesion strength, using the ice adhesion strength measuring device provided in the first aspect embodiment. The specific measurement steps are as follows:

[0008] S1: Adjust the position of the second movable part on the outer arc guide rail and fix the second movable part in the preset position of the outer arc guide rail. Place the icing mold on the sample to be tested and adjust the position of the icing mold and the sample to be tested. When the first movable part and the second movable part are arranged radially along the outer arc guide rail, the geometric center of the opening end face of the icing chamber near the sample to be tested is located on the extension line of the line of action between the first movable part and the second movable part.

[0009] S2: Pull the force line in any direction and record the tension value measured by the tension sensor when the icing mold moves. ;

[0010] S3: Adjust the freezing mold and the sample to be tested to the positions in step S1;

[0011] S4: Inject the target liquid into the freezing chamber and place the measuring device into the low-temperature environment until the target liquid in the freezing chamber freezes;

[0012] S5: Pull the action line in the same direction as in step S2, and record the tension value measured by the tension sensor when the ice falls off the surface of the sample. ;

[0013] S6: Calculate ice adhesion strength : , Let be the area of ​​the ice-solid interface.

[0014] The technical solution provided in this application can achieve the following beneficial effects:

[0015] In this application, by cooperating with the inner and outer circular arc guide rails, the first movable part, and the second movable part, the line of action can be adjusted to any preset angle, allowing the line of action to pull the icing mold away from the sample under test along any preset angle, thereby obtaining the corresponding tensile force data and calculating the ice adhesion strength at the corresponding angle. By adjusting the positions of the first and second movable parts, the ice adhesion strength at any angle can be measured, expanding the measurable angle range of ice adhesion strength. At the same time, the geometric center of the opening end face of the icing chamber near the sample under test is the geometric center of the ice-solid interface. The extension of the line of action directly passes through this geometric center, stabilizing the direction of the force on the ice-solid interface and reducing or even avoiding the risk of the ice-solid interface being subjected to additional torque, thereby improving the measurement accuracy of the tensile sensor and the accuracy of the calculated ice adhesion strength. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the measuring device provided in some embodiments of this application. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the overall structure of the measuring device provided in some embodiments of this application. Figure 2 ;

[0019] Figure 3 This application is about Figure 2 Detailed view of point A;

[0020] Figure 4 This application is about Figure 2 Detailed image of point B;

[0021] Figure 5 This is a schematic diagram of the overall structure of the measuring device provided in some embodiments of this application. Figure 3 ;

[0022] Figure 6 These are schematic diagrams illustrating the use of the measuring device provided in some embodiments of this application;

[0023] Figure 7 This is a schematic diagram showing the fit between the icing mold and the inner arc guide rail provided in some embodiments of this application.

[0024] In the diagram: 100 - Inner circular arc guide rail, 200 - Outer circular arc guide rail, 300 - Icing mold, 310 - Icing chamber, 400 - Line of action, 500 - First moving part, 600 - Second moving part, 610 - Second pulley, 700 - Steering part, 710 - First pulley, 800 - Placement plate, 900 - Sample to be tested. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] This application provides an ice adhesion strength measuring device, which includes an inner arc guide rail 100, an outer arc guide rail 200, an ice forming mold 300, a line of action 400, a tension sensor, a first movable part 500, a second movable part 600, and a steering part 700.

[0027] For reference Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the outer arc guide rail 200 is coaxially sleeved around the inner arc guide rail 100, and the two are coaxially arranged. The icing mold 300 is fixedly connected to the inner arc guide rail 100. The icing mold 300 and the inner arc guide rail 100 can move synchronously under the action of external force. The icing mold 300 is provided with an icing chamber 310, which is used to inject the target liquid for freezing. The icing chamber 310 can contact the surface of the sample 900 to be tested. During use, the icing chamber 310 needs to be placed on the surface of the sample 900 to be tested. When the target liquid freezes in the icing chamber 310, it can directly adhere to the surface of the sample 900 to be tested. By moving the position of the icing mold 300, the icing mold 300 and the sample 900 to be tested are separated, thereby allowing the ice to detach from the sample 900 to be tested. By measuring the force exerted when the icing mold 300 detaches from the sample 900 to be tested, an important data basis is provided for calculating the ice adhesion strength.

[0028] The first movable component 500 is movably mounted on the inner arc guide rail 100 and can move along the inner arc guide rail 100 in an arc-shaped path. The second movable component 600 is movably mounted on the outer arc guide rail 200 and can move along the outer arc guide rail 200 in an arc-shaped path. The movement paths of the first movable component 500 and the second movable component 600 are coaxial. Furthermore, the second movable component 600 is detachably connected to the outer arc guide rail 200. The second movable component 600 can be fixed to the outer arc guide rail 200 or detached from it to facilitate adjustment of its position on the outer arc guide rail 200. The steering component 700 is fixedly installed. The fixed installation of the steering component 700 means that its position is fixed. It can be fixed to the outer arc guide rail 200 or to other structures or devices that will not move, ensuring that the position of the steering component 700 will not change during the use of the measuring device.

[0029] One end of the line of action 400 is fixed to the first movable member 500 and can move with the first movable member 500 relative to the inner arc guide rail 100. The other end of the line of action 400 is sequentially wound around the second movable member 600 and the steering member 700, and connected to the tension sensor. Both the second movable member 600 and the steering member 700 can maintain a stable position. The winding of the line of action 400 around the second movable member 600 and the steering member 700 can ensure the stability of the extension direction of the line of action 400, which is convenient for measuring the tension applied by the line of action 400 to the icing mold 300 using the tension sensor.

[0030] The first movable member 500 can move along the inner arc guide rail 100 under the drive of the line of action 400, so as to be radially aligned with the second movable member 600 along the outer arc guide rail 200. The extension line of the line of action 400 passes through the icing chamber 310 and is close to the geometric center of the opening end face of the sample 900 to be tested. (Refer to...) Figure 1 As shown, the extension of the line of action 400 is represented by a dashed line. This extension of the line of action 400 is also perpendicular to the axis of the inner circular arc guide rail 100.

[0031] The first movable member 500 is movably connected to the inner arc guide rail 100. Under the pull of the line of action 400, the first movable member 500 can move along the inner arc guide rail 100 until the distance between the first movable member 500 and the second movable member 600 is the closest, that is, the first movable member 500 and the second movable member 600 are arranged radially along the inner arc guide rail 100 or the outer arc guide rail 200.

[0032] Meanwhile, in this case, the extension of the line of action 400 connected to the first movable member 500 is collinear with the geometric center of the ice-solid interface, ensuring that when the line of action 400 pulls the icing mold 300, the direction of the force on the ice in the icing chamber 310 is the same as the direction of the line of action 400 between the first movable member 500 and the second movable member 600, which helps to improve the accuracy of the final measurement results.

[0033] The ice-solid interface refers to the surface in contact between the ice and the sample 900 when the ice chamber 310 is frozen. The actual position of this surface is the position of the opening end face of the ice chamber 310, and the geometric center of this surface is the geometric center of the opening end face. The geometric center is the "average position" of all points of a geometric figure, which can be regarded as the "midpoint" of the figure.

[0034] In the embodiments provided in this application, the direction of the force exerted by the line of action 400 on the icing mold 300 can be adjusted by adjusting the position of the second movable member 600 on the outer arc guide rail 200. The position of the first movable member 500 can be adaptively adjusted according to the position of the line of action 400, so only the position of the second movable member 600 needs to be adjusted. By adjusting the second movable member 600 to different positions on the outer arc guide rail 200, tensile force data at different angles can be measured, thereby calculating the ice adhesion strength at different angles, expanding the measurable angle range of ice adhesion strength, and providing an important data foundation for subsequent anti-icing and de-icing technology research.

[0035] Moreover, since the tensile force on the ice in the measuring device of this application passes directly through the geometric center of its ice-solid interface, the direction of the force on the ice-solid interface is stable, reducing or even avoiding the risk of the ice-solid interface being subjected to both thrust and torque in the prior art, and avoiding the ice-solid interface being subjected to additional torque during the measurement process, thereby improving the measurement accuracy of the tensile sensor and the accuracy of the calculated ice adhesion strength.

[0036] In some embodiments, the geometric center of the opening end face of the icing chamber 310 near the sample 900 is located on the axis of the inner arc guide rail 100, so as to ensure the ice-solid interface is subjected to balanced forces as much as possible when the pulling line 400 is pulled. Preferably, the first moving member 500 is located at the midpoint of the thickness of the inner arc guide rail 100, which further improves the effect of balanced forces on the ice-solid interface.

[0037] In some preferred embodiments, the opening end face of the icing chamber 310 near the sample 900 is coplanar with the axis of the inner arc guide rail 100, ensuring that the ice-solid interface is subjected to relatively balanced forces when the pulling line 400 is pulled, and avoiding the situation where the ice-solid interface is tilted relative to the inner arc guide rail 100, resulting in uneven and unstable forces and excessive measurement error.

[0038] The freezing chamber 310 can have a prismatic structure, such as a triangular prism or a square prism. In some preferred embodiments, the freezing chamber 310 has a cylindrical structure. After the liquid freezes in the freezing chamber 310, the frozen ice will not have sharp edges or corners, and the overall structural strength of the frozen ice is high and not easily damaged. Therefore, it can also avoid structural damage to the frozen ice caused by collisions during the process of the freezing mold 300 being removed from the test sample 900, and avoid the impact of frozen ice structural damage on the accuracy of ice adhesion strength measurement.

[0039] In some preferred embodiments, the surface roughness of the sidewalls of the icing chamber 310 is set to be higher. This can be achieved by coating the sidewalls of the icing chamber 310 with a material of higher roughness, or by directly selecting a material of higher roughness to manufacture the icing chamber 310. After the liquid freezes inside the icing chamber 310, the frozen ice adheres more tightly to the sidewalls of the icing chamber 310. Even when the frozen ice is pulled apart from the sample 900 using the line of action 400, the frozen ice and the icing chamber 310 will not detach from each other, further improving the accuracy of the data measured by the tension sensor.

[0040] The connection between the icing mold 300 and the inner arc guide rail 100 can be referenced. Figure 7 As shown, the inner arc guide rail 100 is sleeved around the icing mold 300. Both ends of the icing mold 300 are fixed to the inner circumferential wall of the inner arc guide rail 100. When the inner arc guide rail 100 is pulled by the line of action 400, the force on the icing mold 300 can be more balanced, thereby improving the accuracy of the data measured by the tension sensor. In addition, the fixing of the icing mold 300 to the inner circumferential wall of the inner arc guide rail 100 will not affect the overall length setting of the inner arc guide rail 100.

[0041] In some embodiments, the steering member 700 is located outside the outer arc guide rail 200 to avoid the position of the steering member 700 affecting the arrangement of the partial action line 400 between the first movable member 500 and the second movable member 600.

[0042] The measuring device also includes a lifting mechanism, which, along with the icing mold 300, is located on both sides of the sample 900 to be tested. The lifting mechanism drives the sample 900 to move along the axis of the icing chamber 310. The position of the sample 900 can be adjusted using the lifting mechanism to accommodate its thickness. For samples 900 of different thicknesses, the position can be adjusted using the lifting mechanism to ensure stable contact between the sample 900 and the icing mold 300. In some specific embodiments, the lifting mechanism can be a hydraulic device or an electric push rod, etc.

[0043] refer to Figure 4 As shown, the steering component 700 has a first pulley 710. (Reference) Figure 3As shown, the second movable member 600 has a second pulley 610. Both the first pulley 710 and the second pulley 610 are rotatable along their axes. Both the first pulley 710 and the second pulley 610 are used to contact and engage with the line of action 400. When the line of action 400 is wound around the second movable member 600 and the steering member 700, it is actually wound around the outside of the first pulley 710 and the second pulley 610. When an external force pulls the line of action 400, it can drive the first pulley 710 and the second pulley 610 to rotate, preventing friction between the line of action 400 and the first and second pulleys 710 from affecting the accuracy of the final measurement result of the tension sensor.

[0044] In some embodiments, the measuring device further includes a placement plate 800, for reference. Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the outer arc guide rail 200, the inner arc guide rail 100, and the steering component 700 are all fixed to the placement plate 800. The outer arc guide rail 200, the inner arc guide rail 100, and the steering component 700 are directly positioned using the placement plate 800. During use, the position of the entire measuring device can be moved simply by moving the placement plate 800. A protrusion can be provided on the placement plate 800 to fix the steering component 700; see reference [reference needed]. Figure 5 As shown.

[0045] In some embodiments, the action line 400 can be manually pulled to separate the icing mold 300 from the sample 900 to be tested. It is important to note that the pulling direction of the action line 400 needs to be kept stable to avoid errors caused by different directions. In some preferred embodiments, the measuring device further includes a drive motor connected to the action line 400, which is used to pull the action line 400.

[0046] This application provides a method for measuring ice adhesion strength. Using the ice adhesion strength measuring device provided in any of the above embodiments, the specific measurement steps are as follows:

[0047] S1: Adjust the position of the second movable part 600 on the outer arc guide rail 200 and fix the second movable part 600 in the preset position of the outer arc guide rail 200. The preset position is determined according to the angle to be measured. Place the icing mold 300 on the sample 900 to be tested, and adjust the positions of the icing mold 300 and the sample 900 to be tested. With the first movable part 500 and the second movable part 600 arranged radially along the outer arc guide rail 200, the geometric center of the icing chamber 310 near the opening end face of the sample 900 to be tested is located on the extension line of the line of action 400 between the first movable part 500 and the second movable part 600.

[0048] First, the installation position of the second movable part 600 needs to be determined according to the angle to be measured. At the same time, the positions of the sample to be measured 900 and the icing mold 300 also need to be adjusted. Only after the position of the measuring device is adjusted can the next step be carried out.

[0049] S2: Pull the action line 400 in any direction and record the tension value measured by the tension sensor when the icing mold 300 moves. .

[0050] S3: Readjust the positions of the icing mold 300 and the sample 900 to be tested, adjusting them to the positions established in step S1. Since the position of the icing mold 300 has shifted in step S2, it needs to be readjusted for the next test. If the position of the sample 900 has shifted, it also needs to be adjusted. In some preferred embodiments, the sample 900 can be detachably fixed to the placement plate 800 to further secure its position and prevent changes in its position from affecting the accuracy of the final measurement data.

[0051] S4: After the position of the freezing mold 300 is adjusted, the target liquid can be injected into the freezing chamber 310, and the measuring device can be placed in a low-temperature environment until the target liquid in the freezing chamber 310 freezes. The target liquid is determined according to the experimental requirements and can be deionized water, saline, etc. The ice thickness is generally set to about 10 mm, but it can also be set to other thicknesses according to the experimental requirements. This application embodiment does not impose specific limitations on the ice thickness.

[0052] In the embodiments provided in this application, the positions of the first movable part 500 and the second movable part 600 need to be adjusted before the icing process is carried out. This can avoid the situation where the pulling of the ice during the adjustment of the position of the line of action 400 after the icing is completed affects the final measurement result.

[0053] S5: Pull the action line 400 in the same direction as in step S2, and record the tensile force measured by the tension sensor when the ice falls off the surface of the sample 900. It should be noted that the pulling direction of the line of action 400 needs to be the same as in step S2.

[0054] In some preferred embodiments, when a drive motor is provided to drive the line of action 400, the force direction of the line of action 400 is stable, and the force exerted by the drive motor on the line of action 400 is also relatively stable, resulting in more accurate measurement results. The drive motor can be a stepper motor or similar device. A high-precision tension sensor can be selected to obtain more accurate measurement data.

[0055] In addition, in some preferred embodiments, the entire measurement process can be carried out in a low-temperature environment, thereby avoiding errors in the measurement results between two measurements due to different ambient temperatures.

[0056] S6: Calculate ice adhesion strength : , Let be the area of ​​the ice-solid interface.

[0057] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for measuring ice adhesion strength, characterized in that, It includes an inner arc guide rail, an outer arc guide rail, an icing mold, a line of action, a tension sensor, a first moving part, a second moving part, and a steering part; The outer arc guide rail is coaxially sleeved outside the inner arc guide rail. The icing mold is fixedly connected to the inner arc guide rail. The icing mold is provided with an icing chamber, which can contact the surface of the sample to be tested. The first movable part is movably installed on the inner arc guide rail. The second movable part is movably installed on the outer arc guide rail and detachably connected to the outer arc guide rail. The steering part is fixedly installed. One end of the line of action is fixed to the first movable part, and the other end is sequentially wound around the second movable part and the steering part, and connected to the tension sensor. The first movable member is capable of moving along the inner arc guide rail under the drive of the line of action, so as to be radially aligned with the second movable member along the outer arc guide rail, and the extension line of the line of action passes through the geometric center of the opening end face of the icing chamber near the sample to be tested.

2. The ice adhesion strength measuring device according to claim 1, characterized in that, The geometric center of the opening face of the icing chamber near the sample to be tested is located on the axis of the inner circular arc guide rail.

3. The ice adhesion strength measuring device according to claim 2, characterized in that, The opening end face of the icing chamber near the sample to be tested is coplanar with the axis of the inner circular arc guide rail.

4. The ice adhesion strength measuring device according to claim 1, characterized in that, The icing chamber has a cylindrical structure; And / or, the inner arc guide rail is sleeved outside the icing mold, and both ends of the icing mold are fixed to the inner circumferential wall of the inner arc guide rail.

5. The ice adhesion strength measuring device according to claim 1, characterized in that, The steering component is located on the outside of the outer circular arc guide rail.

6. The ice adhesion strength measuring device according to claim 1, characterized in that, The measuring device also includes a lifting mechanism, which is located on both sides of the sample to be tested, along with the icing mold. The lifting mechanism is used to drive the sample to be tested to move along the axis of the icing chamber.

7. The ice adhesion strength measuring device according to claim 1, characterized in that, The steering component has a first pulley, and the second movable component has a second pulley. Both the first pulley and the second pulley are used to contact and cooperate with the line of action. When an external force pulls the line of action, the line of action can drive the first pulley and the second pulley to rotate.

8. The ice adhesion strength measuring device according to claim 1, characterized in that, The measuring device also includes a placement plate, and the outer circular arc guide rail, the inner circular arc guide rail, and the steering component are all fixed to the placement plate.

9. The ice adhesion strength measuring device according to claim 1, characterized in that, The measuring device also includes a drive motor, which is connected to the line of action.

10. A method for measuring ice adhesion strength, characterized in that, Using the ice adhesion strength measuring device according to any one of claims 1-9, the specific measurement steps are as follows: S1: Adjust the position of the second movable part on the outer arc guide rail and fix the second movable part in the preset position of the outer arc guide rail. Place the icing mold on the sample to be tested and adjust the position of the icing mold and the sample to be tested. When the first movable part and the second movable part are arranged radially along the outer arc guide rail, the geometric center of the opening end face of the icing chamber near the sample to be tested is located on the extension line of the line of action between the first movable part and the second movable part. S2: Pull the force line in any direction and record the tension value measured by the tension sensor when the icing mold moves. ; S3: Adjust the freezing mold and the sample to be tested to the positions in step S1; S4: Inject the target liquid into the freezing chamber and place the measuring device into the low-temperature environment until the target liquid in the freezing chamber freezes; S5: Pull the action line in the same direction as in step S2, and record the tension value measured by the tension sensor when the ice falls off the surface of the sample. ; S6: Calculate ice adhesion strength : , Let be the area of ​​the ice-solid interface.

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