A measuring system and a measuring method for measuring the micro-deformation amount of a machine housing structure

Abstract

This application relates to a measurement system for measuring the micro-deformation of a machine casing structure, comprising: a worktable including a top plate, a bottom plate, and a support rod; the top of the top plate having a horizontal groove and a vertical groove, the vertical groove being perpendicular to the horizontal groove; a fixed rod fixed to the bottom of the horizontal groove; a measuring rod passing through the vertical groove; a connecting rod, the bottom of which is hinged to the sliding end on the fixed rod, and the top of which is hinged to the top of the measuring rod; and a DC power supply, the positive and negative terminals of which are respectively connected to the fixed end and the sliding end of the fixed rod. This application utilizes a right-angled triangle structure to measure the micro-deformation of the machine casing structure, and leverages the proportional relationship between the resistance and length of the fixed rod to improve the measurement accuracy of the effective length of the fixed rod, thereby greatly improving the accuracy of the calculated micro-deformation of the machine casing structure. Furthermore, this measurement system is simple in structure, easy to operate, convenient to use, and provides fast and efficient measurement of the machine casing structure with high accuracy in measuring its micro-deformation.

Description

Technical Field

[0001] This application relates to the field of measuring micro-deformation of casing structures, and in particular to a measurement system and method for measuring micro-deformation of casing structures. Background Technology

[0002] As electronic products become increasingly integrated into all aspects of society, their structural components, as crucial parts, are also used in every aspect of people's lives, such as mobile phones, tablets, laptops, routers, and televisions. Deformation of these structural components is a critical aspect of research, development, production, and testing, especially for small and precise products like tablets and mobile phones; even minute deformations of their casing components can significantly impact their performance. Common methods for measuring casing deformation include using precision rulers, vernier calipers, and micrometers. However, these methods lack reference coordinates, are prone to applying pressure, or involve tilting the measurement point, making it impossible to measure displacement on a single plane. Alternatively, deformation measuring instruments, laser detectors, or precision sensors can be used to capture positional data and measure the micro-deformation of electronic device casings. However, these precision measuring devices are expensive, have high maintenance costs, complex structures, and are time-consuming and labor-intensive to repair, making them unaffordable for many small and medium-sized enterprises (SMEs). Therefore, finding a simple, convenient, and efficient way to measure the micro-deformation of electronic device casings remains a key research and development focus for SMEs. Summary of the Invention

[0003] To better, faster, and more efficiently measure the micro-deformation of electronic device housings, while also facilitating operation and reducing the workload of measurement personnel, this application provides a measurement system and method for measuring the micro-deformation of housing structures. It utilizes a right-angled triangle structure to measure the micro-deformation of the housing structure and leverages the proportional relationship between the resistance and length of the fixed rod to improve the measurement accuracy of the effective length of the fixed rod. This significantly improves the accuracy of the calculated micro-deformation of the housing structure. Furthermore, the measurement system is simple in structure, easy to operate, convenient to use, and provides fast, efficient, and highly accurate measurement of the micro-deformation of the housing structure.

[0004] Firstly, this application provides a measurement system for measuring the micro-deformation of a casing structure, which adopts the following technical solution:

[0005] A measurement system for measuring micro-deformation of a casing structure, comprising:

[0006] The workbench includes a top plate and a bottom plate arranged in parallel, and a support rod for connecting the top plate and the bottom plate. The top of the top plate has a horizontal groove and a vertical groove along the horizontal direction. The vertical groove is perpendicular to the horizontal groove. The upper surface of the bottom plate is the placement part of the machine housing structure, and the placement part is located directly below the vertical groove.

[0007] A fixed rod is fixed to the bottom of a horizontal groove. The fixed rod is a rheostat. The effective length of the resistance of the fixed rod is L1. The relationship between the resistance and length of the fixed rod is R = aL1, where a is a constant.

[0008] The measuring rod is inserted into a vertical groove, with the bottom being a measuring end for abutting against the housing structure. The side wall of the measuring rod is attached to one end of the fixed rod, wherein the length of the measuring rod extending above the fixed rod is L2.

[0009] A connecting rod, of length L, is hinged at its bottom to the sliding end of a fixed rod and at its top to the top of a measuring rod.

[0010] A DC power supply with voltage V is connected to the fixed end and the sliding end of the fixed rod, respectively. An ammeter is installed on the DC power supply, and the current at both ends of the fixed rod is I, R = V / I.

[0011] The micro-deformation of the casing structure is ΔL2, and the formula for calculating ΔL2 is:

[0012]

[0013] Among them, L 22 L 21 L represents the length of the measuring rod after measuring the housing structure and before measuring the housing structure, respectively. 12 L 11 V1 and I2 represent the lengths of the fixing rods after measuring the rear and front of the housing structure, respectively. V2 and I2 represent the voltage at both ends of the fixing rod after measuring the rear of the housing structure and the current on the fixing rod, respectively. V1 and I1 represent the voltage at both ends of the fixing rod before measuring the front of the housing structure and the current on the fixing rod, respectively.

[0014] Preferably, the angle between the connecting rod and the fixed rod is θ, where θ is greater than or equal to 85°.

[0015] Secondly, this application provides a measurement method for measuring the micro-deformation of a casing structure, which adopts the following technical solution:

[0016] A method for measuring the micro-deformation of a housing structure, applied to the aforementioned measurement system for measuring the micro-deformation of a housing structure, includes the following steps:

[0017] Construct a measurement system for measuring the micro-deformation of the casing structure;

[0018] Measure the length L of the connecting rod;

[0019] Record the voltage V1 across the fixed rod before measuring the machine housing structure and the current I1 on the fixed rod, and record the voltage V2 across the fixed rod after measuring the machine housing structure and the current I2 on the fixed rod. Calculate the effective service length L1 of the fixed rod. The formula for calculating the effective service length L1 of the fixed rod is:

[0020]

[0021] The effective lengths of the fixing rods before and after measuring the micro-deformation of the casing structure are obtained and recorded as L. 11 and L 12 ,

[0022] Assume that the length of L2 before and after measuring the micro-deformation of the casing structure is recorded as L. 21 L 22 ,but

[0023]

[0024]

[0025] Wherein, ΔL2 is the difference in length of the measuring rod before and after measuring the casing structure, that is, the measured micro-deformation of the casing structure.

[0026] Preferably, the angle between the connecting rod and the fixed rod is θ;

[0027] The length of L1 can be expressed as L1 = L * Cosθ. Therefore, the difference in length change of L1 before and after measuring the micro-deformation of the casing structure is ΔL1 = L 11 -L 12 =L*Cosθ1-L*Cosθ2;

[0028] The length of L2 can be expressed as L2=L*Sinθ, then the difference in length change of L2 before and after measuring the micro-deformation of the casing structure is ΔL2=L 21 -L 22 =L*Sinθ2-L*Sinθ1;

[0029] Calculate the ratio of ΔL1 / ΔL2, where the formula for ΔL1 / ΔL2 is:

[0030]

[0031] Where ΔL1 and ΔL2 are the length changes of L1 before and after measuring the micro-deformation of the housing structure, respectively, and θ is the angle between the fixed rod and the connecting rod.

[0032] Adjust the included angle θ between the fixed rod and the connecting rod according to the ratio of ΔL1 / ΔL2.

[0033] Preferably, based on the ratio of ΔL1 / ΔL2, when the included angle θ between the fixed rod and the connecting rod is greater than or equal to 85°, the ratio of ΔL1 / ΔL2 increases rapidly. When measuring the micro-deformation of the housing structure, the included angle between the connecting rod and the fixed rod is greater than or equal to 85°.

[0034] In summary, this application includes the following beneficial technical effects:

[0035] 1. This application improves the measurement accuracy of the effective length of the fixed rod by utilizing the proportional relationship between the resistance and length of the fixed rod, thereby greatly improving the accuracy of the calculated micro-deformation of the housing structure. Moreover, the measurement system has a simple structure, is easy to operate, convenient to use, and measures the housing structure quickly and efficiently, with high accuracy in measuring the micro-deformation of the housing structure.

[0036] 2. This application adjusts the included angle between the fixed rod and the connecting rod to be greater than or equal to 85°, so that when the length of the measuring rod changes, the sliding distance of the connecting rod on the fixed rod will increase exponentially, which is beneficial to the change of current on the fixed rod, thereby improving the accuracy of the calculation of the effective length of the fixed rod, and thus improving the calculation accuracy of the micro deformation of the casing structure. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0038] Figure 2 It is a line graph of the cosine and sine functions.

[0039] Explanation of reference numerals in the attached diagram: 11. Top rod; 12. Base plate; 13. Support rod; 2. Fixing rod; 3. Measuring rod; 4. Connecting rod. Detailed Implementation

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] This application discloses a measurement system for measuring the micro-deformation of a casing structure.

[0042] The measurement system for measuring the micro-deformation of the casing structure includes a worktable, a fixed rod 2, a measuring rod 3, a connecting rod 4, and a DC power supply (not shown in the figure).

[0043] The workbench includes a top plate 11, a bottom plate 12, and support rods 13. The top plate 11 and the bottom plate 12 are arranged in parallel. The two ends of the support rods 13 can be fixedly connected to the top plate 11 and the bottom plate 12 respectively. Four support rods 13 are selected. The four support rods 13 are located at the four corners of the square top plate 11. The four support rods 13 support the top plate 11. The support rods 13 can also pass through the bottom plate 12. The bottom plate 12 and the top plate 11 are placed horizontally.

[0044] The top plate 11 has a horizontal groove and a vertical groove on its top side. The vertical groove is perpendicular to the horizontal groove. The upper surface of the bottom plate 12 is a placement part for placing the housing structure. The placement part is located directly below the vertical groove.

[0045] The fixing rod 2 is fixed to the bottom of the horizontal groove. The fixing rod 2 is placed horizontally. The fixing rod 2 is a rheostat. The effective length of the resistor used on the fixing rod 2 is L1. The relationship between the resistance and length of the fixing rod 2 is R = aL1, where a is a constant.

[0046] The measuring rod 3 is inserted into the vertical groove. The bottom of the measuring rod 3 is a measuring end for abutting against the housing structure. The side wall of the measuring rod 3 is attached to one end of the fixed rod 2. Scales can be set on the outer wall of the measuring rod 3. The length of the part of the measuring rod 3 that extends above the fixed rod 2 is L2.

[0047] The length of the connecting rod 4 is L. The bottom of the connecting rod 4 is hinged to the sliding end on the fixed rod 2, and the top of the connecting rod 4 is hinged to the top of the measuring rod 3.

[0048] The DC power supply has a voltage of V. The positive and negative terminals of the DC power supply are connected to the sliding end on fixed rod 2 and the contact end between fixed rod 2 and measuring rod 3, respectively. An ammeter is installed on the DC power supply, and the current on the ammeter is I. Since the vertical groove is perpendicular to the horizontal groove, the measuring rod 3 is perpendicular to fixed rod 2. Therefore, the measuring rod 3, fixed rod 2, and connecting rod 4 form a right triangle. By the Pythagorean theorem, the formula for calculating the length L2 of the measuring rod 3 is:

[0049]

[0050] The effective resistance on fixed rod 2 is R, and the formula for calculating R is:

[0051] R = V / I;

[0052] Combining the relationship between the resistance and length of fixed rod 2, R = aL1, we can derive the formula for calculating the effective length L1 of fixed rod 2:

[0053]

[0054] In summary, assuming the micro-deformation of the casing structure is ΔL2, the formula for calculating ΔL2 can be derived from the above formula:

[0055]

[0056] Among them, L 22 L 21 The lengths L of measuring rod 3 after measuring the housing structure and before measuring the housing structure are respectively. 12 L 11V1 and I2 are the lengths of the fixed rod 2 after measuring the rear and front of the housing structure, respectively. V2 and I2 are the voltage at both ends of the fixed rod 2 after measuring the rear of the housing structure and the current on the fixed rod 2, respectively. V1 and I1 are the voltage at both ends of the fixed rod 2 before measuring the front of the housing structure and the current on the fixed rod 2, respectively.

[0057] To improve the accuracy of measuring the micro-deformation of the housing structure, assuming the angle between connecting rod 4 and fixed rod 2 is θ, when measuring the micro-deformation of the housing structure, the angle θ can be greater than or equal to 85° to improve the accuracy of the measured micro-deformation. For specific reasons and detailed explanations, please refer to the following embodiment of a measurement method for measuring the micro-deformation of the housing structure.

[0058] This application also discloses a measurement method for measuring the micro-deformation of a casing structure.

[0059] This method for measuring the micro-deformation of a casing structure utilizes a measurement system for measuring the micro-deformation of a casing structure. Specifically, the method includes the following steps:

[0060] S1. Construct a measurement system for measuring the micro-deformation of the casing structure;

[0061] Specifically, a measurement system for measuring the micro-deformation of a casing structure is constructed based on the specific structure disclosed in the above embodiment of the measurement system for measuring the micro-deformation of the casing structure.

[0062] S2. Measure the length L of connecting rod 4;

[0063] Since the length L of the connecting rod 4 is a fixed value, after the measurement system for measuring the micro-deformation of the housing structure is constructed, the actual effective length of the connecting rod 4 in the measurement system is measured. The effective length of the connecting rod 4 refers to the distance between the connection point of the connecting rod 4 and the fixed rod 2 and the connection point of the connecting rod 4 and the measuring rod 3, and the length of the connecting rod 4 is recorded as L.

[0064] S3. Record the voltage V1 at both ends of the front fixing rod 2 and the current I1 on the fixing rod 2, and record the voltage V2 at both ends of the rear fixing rod 2 and the current I2 on the fixing rod 2.

[0065] Specifically, before measuring the housing structure, the voltage and current at both ends of the fixing rod 2 are recorded as V1 and I1 respectively. Then, the housing structure is placed on the placement part on the base plate 12. Next, the voltage and current at both ends of the fixing rod 2 are recorded as V2 and I2 respectively. Finally, the housing structure is removed to complete the measurement of the micro deformation of the housing structure.

[0066] From the formula R = V / I and the company It can be seen that, Therefore, the formula for calculating ΔL2 is:

[0067]

[0068] Among them, L 22 L 21 The lengths L of measuring rod 3 after measuring the housing structure and before measuring the housing structure are respectively. 12 L 11 V1 and I2 are the lengths of the fixed rod 2 after measuring the rear and front of the housing structure, respectively. V2 and I2 are the voltage at both ends of the fixed rod 2 after measuring the rear of the housing structure and the current on the fixed rod 2, respectively. V1 and I1 are the voltage at both ends of the fixed rod 2 before measuring the front of the housing structure and the current on the fixed rod 2, respectively.

[0069] Substituting the measured voltage and current values ​​into the calculation formula for ΔL2, the value of the micro-deformation ΔL2 of the casing structure is obtained. To further improve the accuracy of the measured micro-deformation ΔL2 of the casing structure, the measuring personnel can measure the casing structure multiple times and then calculate the average value of the multiple measurements as the micro-deformation of the casing structure. Alternatively, the highest and lowest values ​​in the multiple measurements can be removed, and then the average value of the micro-deformation data from the multiple measurements can be calculated. This average value can then be used as the final micro-deformation of the casing structure.

[0070] Since the angle between connecting rod 4 and fixed rod 2 is θ, the length of L1 can be expressed as L1 = L * Cosθ. Therefore, the difference in length change of L1 before and after measuring the micro-deformation of the casing structure is ΔL1 = L 11 -L 12 =L*Cosθ1-L*Cosθ2;

[0071] The length of L2 can be expressed as L2=L*Sinθ, then the difference in length change of L2 before and after measuring the micro-deformation of the casing structure is ΔL2=L 21 -L 22 =L*Sinθ2-L*Sinθ1;

[0072] Calculate the ratio of ΔL1 / ΔL2, where the formula for ΔL1 / ΔL2 is:

[0073]

[0074] Where ΔL1 and ΔL2 are the length changes of L1 before and after measuring the micro-deformation of the housing structure, respectively, and θ is the angle between the fixed rod 2 and the connecting rod 4.

[0075] From the above formulas, it can be seen that ΔL1 is related to the cosine function, and ΔL2 is related to the sine function. For example... Figure 2As shown, by observing the cosine and sine functions, it can be concluded that as θ increases from 0 to 90 degrees, the ratio of ΔL1 / ΔL2 gradually increases. That is to say, when the change in ΔL2 is extremely small, the change in ΔL1 increases dramatically. This facilitates the change in current on the fixed rod 2, thereby increasing the change in the effective length of the fixed rod 2, improving the accuracy of the measurement of the effective length of the fixed rod 2, and further improving the accuracy of the measurement of the effective length of the measuring rod 3, that is, improving the measurement accuracy of the micro-deformation of the casing structure.

[0076] After observation Figure 2 Through experiments and verification, the staff found that when the included angle θ between the fixed rod 2 and the connecting rod 4 is greater than or equal to 85°, the accuracy of the measured micro-deformation of the casing structure is higher. Therefore, when constructing the measurement system, the included angle θ between the fixed rod 2 and the connecting rod 4 is made greater than or equal to 85° in advance in order to improve the measurement accuracy of the micro-deformation of the casing structure.

[0077] Since the voltage of a DC power supply is relatively stable during use, the formula for calculating ΔL2 can also be expressed as:

[0078]

[0079] In the above formula, the current I is the only variable. When there is no voltmeter on the DC power supply, the above formula can be used to measure the micro-deformation of the casing structure, where V is the rated voltage of the DC power supply.

[0080] Furthermore, to better analyze the ratio of ΔL1 / ΔL2, a computer can be used to calculate the formula for the ratio of ΔL1 / ΔL2. A line graph is generated. From the line graph of the ratio of ΔL1 / ΔL2, it can be seen that when the included angle θ between the fixed rod 2 and the connecting rod 4 is greater than or equal to 85°, the accuracy of the measured micro-deformation of the casing structure is relatively high. Therefore, when constructing the measurement system, the included angle θ between the fixed rod 2 and the connecting rod 4 should be greater than or equal to 85° in advance in order to improve the measurement accuracy of the micro-deformation of the casing structure.

[0081] Specifically, with L = 100cm and θ ranging from 88° to 89°, the measured variation of L2 is ΔL2 = 0.4568682mm, and the strain value of L1 is ΔL1 = 17.4470903mm. Comparing the micro-deformation of 0.4568682mm in the measured value of ΔL2, it can be reflected by the strain of ΔL1 = 17.4470903mm. In this way, the measured value is magnified by 38.188 times, and the value of ΔL1 is easier to measure accurately, reducing the error of directly measuring micro-deformation.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A measurement system for measuring the micro-deformation of a casing structure, characterized in that, include: The workbench includes a top plate and a bottom plate arranged in parallel, and a support rod for connecting the top plate and the bottom plate. The top of the top plate has a horizontal groove and a vertical groove along the horizontal direction. The vertical groove is perpendicular to the horizontal groove. The upper surface of the bottom plate is the placement part of the machine housing structure, and the placement part is located directly below the vertical groove. A fixed rod is fixed to the bottom of a horizontal groove. The fixed rod is a rheostat. The effective length of the resistance of the fixed rod is L1. The relationship between the resistance and length of the fixed rod is R = aL1, where a is a constant. The measuring rod is inserted into a vertical groove, with the bottom being a measuring end for abutting against the housing structure. The side wall of the measuring rod is attached to one end of the fixed rod, wherein the length of the measuring rod extending above the fixed rod is L2. A connecting rod, of length L, is hinged at its bottom to the sliding end of a fixed rod and at its top to the top of a measuring rod. A DC power supply with voltage V is connected to the fixed end and the sliding end of the fixed rod, respectively. An ammeter is installed on the DC power supply, and the current at both ends of the fixed rod is I, R = V / I. The micro-deformation of the casing structure is ΔL2, and the formula for calculating ΔL2 is: Among them, L 22 L 21 The lengths of the measuring rods, L, are the lengths after and before the deformation of the casing structure, respectively. 12 L 11 V1 and I2 represent the lengths of the fixing rod after and before the deformation of the casing structure, respectively. V2 and I2 represent the voltage at both ends of the fixing rod and the current on the fixing rod after the deformation of the casing structure, respectively. V1 and I1 represent the voltage at both ends of the fixing rod and the current on the fixing rod before the deformation of the casing structure, respectively.

2. The measurement system for measuring micro-deformation of a casing structure according to claim 1, characterized in that, The angle between the connecting rod and the fixed rod is θ, where θ is greater than or equal to 85°.

3. A method for measuring the micro-deformation of a casing structure, applied to the measurement system for measuring the micro-deformation of a casing structure as described in claim 1 or 2, characterized in that, Includes the following steps: Construct a measurement system for measuring the micro-deformation of the casing structure; Measure the length L of the connecting rod; Record the voltage V1 across the fixing rod and the current I1 on the fixing rod before the casing structure deforms, and record the voltage V2 across the fixing rod and the current I2 on the fixing rod after the casing structure deforms. Calculate the effective service length L1 of the fixing rod. The formula for calculating the effective service length L1 of the fixing rod is: The effective lengths of the fixing rods before and after the deformation of the casing structure are obtained and recorded as L. 11 and L 12 , Assume L2 is the length of the measuring rod extending above the fixed rod, and record L2 as L before and after the deformation of the casing structure. 21 L 22 ,but Wherein, ΔL2 is the difference in the length of the measuring rod before and after the deformation of the casing structure, that is, the measured micro-deformation of the casing structure.

4. The method for measuring micro-deformation of a casing structure according to claim 3, characterized in that, The angle between the connecting rod and the fixed rod is θ; The length of L1 is expressed as L1 = L * Cosθ, then the difference in length change of L1 before and after the deformation of the casing structure is ΔL1 = L 11 -L 12 =L*Cosθ1-L*Cosθ2; The length of L2 is expressed as L2=L*Sinθ, then the difference in length of L2 before and after the deformation of the casing structure is ΔL2=L 21 -L 22 =L*Sinθ2-L*Sinθ1; Calculate the ratio of ΔL1 / ΔL2, where the formula for ΔL1 / ΔL2 is: Where ΔL1 and ΔL2 are the length changes of L1 and L2 before and after the deformation of the housing structure, respectively, and θ is the angle between the fixed rod and the connecting rod. Adjust the included angle θ between the fixed rod and the connecting rod according to the ratio of ΔL1 / ΔL2.

5. A method for measuring micro-deformation of a casing structure according to claim 4, characterized in that, According to the ratio of ΔL1 / ΔL2, when the included angle θ between the fixed rod and the connecting rod is greater than or equal to 85°, the ratio of ΔL1 / ΔL2 increases rapidly. When measuring the micro-deformation of the housing structure, the included angle between the connecting rod and the fixed rod is greater than or equal to 85°.

Images