A positioning device for a laser flatness measuring instrument

Abstract

The utility model discloses a positioning device of laser flatness measuring instrument. The positioning device includes: the measuring platform that is equipped with multiple even distribution positioning hole, the multiple first positioning pillar of pluggable installation in the positioning hole is used for to the side edge positioning of the product to be measured, the multiple second positioning pillar of pluggable installation in the positioning hole is used for supporting the bottom surface of the product to be measured. The height of first positioning pillar is greater than the height of second positioning pillar, makes first positioning pillar top end higher than the upper surface of the product to be measured, and second positioning pillar top end forms point support with the bottom surface of the product to be measured. When using, by selectively inserting two kinds of pillar in different positions, first positioning pillar limits product transverse movement, and second positioning pillar will product overhanging support, makes the clearance between product bottom surface and measuring platform, thoroughly eliminates the influence of air isolation layer. The utility model replaces surface support through point support, effectively improves the measuring accuracy and stability, and simultaneously realizes the versatility measurement to different specifications products through the flexible arrangement of pluggable pillar.

Description

Technical Field

[0001] This utility model relates to the field of flatness measurement technology, and in particular to a positioning device for a laser flatness measuring instrument. Background Technology

[0002] Glass covers, as a crucial component of smart electronic products, are widely used in devices such as mobile phones, tablets, and smartwatches. They need to be assembled into the mid-frame of electronic products and attached to the display module; their flatness directly affects the product's assembly accuracy, appearance quality, and performance. When the flatness of the glass cover does not meet requirements, it can lead to uneven assembly gaps, abnormal display effects, and decreased touch sensitivity, and in severe cases, even affect the product's sealing and structural strength. Therefore, measuring the flatness of the glass cover is a critical quality control step in the production process.

[0003] Currently, laser flatness measuring instruments are the primary method for inspecting the flatness of glass covers. Existing laser flatness measuring instruments generally employ a high-flatness solid-surface measuring platform, placing the glass cover to be measured directly on the platform surface. However, due to the smooth and flat surface of the glass cover, and the equally high flatness of the measuring platform surface, a sealed air gap forms at the contact interface when the two highly flat surfaces come into contact. This air gap acts like an air cushion, causing the glass cover to be in a semi-suspended state, making it prone to lateral drift and vertical floating. Uneven air pressure distribution within the air gap can also lead to inconsistent heights of the glass cover in all directions, severely affecting the accuracy of laser measurements. Relative movement during the measurement process can easily cause scratches on the glass surface, and tiny particulate contaminants from the platform surface can easily transfer to the glass cover, resulting in poor appearance. These problems not only affect product yield but also increase the costs of subsequent cleaning and rework. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a positioning device for a laser flatness measuring instrument that can eliminate the influence of air isolation layer, improve measurement accuracy, reduce product surface damage, and has good versatility.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A positioning device for a laser flatness measuring instrument includes: a measuring platform with a plurality of uniformly distributed positioning holes; a plurality of first positioning supports, each first positioning support being pluggably installed in the positioning holes for lateral positioning of the product under test; and a plurality of second positioning supports, each second positioning support being pluggably installed in the positioning holes for supporting the bottom surface of the product under test. The height of the first positioning supports is greater than the height of the second positioning supports, the top of the first positioning supports is higher than the upper surface of the product under test, and the top of the second positioning supports contacts the bottom surface of the product under test to form point support. In use, by selectively inserting the first and second positioning supports into the positioning holes at different positions on the measuring platform, the first positioning supports form a positioning structure restricting the lateral movement of the product under test, and the second positioning supports suspend the product under test above the measuring platform, creating a gap between the bottom surface of the product under test and the measuring platform.

[0006] Furthermore, at least four of the first positioning pillars are provided. When in use, the four first positioning pillars are arranged on the measuring platform to form an L-shaped positioning angle structure for positioning two adjacent sides of the product to be measured.

[0007] Furthermore, the second positioning pillar is configured to be at least three, and when in use, the second positioning pillar forms a support structure of three or more points on the bottom surface of the product under test.

[0008] Furthermore, the measuring platform is made of aluminum alloy, and the positioning hole is a pin hole that matches the insertion end of the first positioning support and the second positioning support.

[0009] Furthermore, the first and second positioning pillars are made of materials with a hardness lower than that of the glass product under test, in order to avoid scratching the product when in contact with it.

[0010] Furthermore, both the first and second positioning supports are made of P-type steel.

[0011] Furthermore, both the first and second positioning pillars have a stepped shaft structure, comprising a pin section, a limiting section, and a working section in sequence along the axial direction. The pin section forms the lower end of the pillar, and its outer diameter is adapted to the diameter of the positioning hole. The limiting section is located between the pin section and the working section, and its outer diameter is larger than that of the pin section. The lower end face of the limiting section forms a limiting surface for abutting against the upper surface of the measuring platform. The working section forms the upper end of the pillar and extends upward from the upper end face of the limiting section. The axial length of the working section of the first positioning pillar is greater than that of the working section of the second positioning pillar, such that the top of the working section of the first positioning pillar is higher than the upper surface of the product to be tested after placement, and the top of the working section of the second positioning pillar forms the support surface of the product to be tested.

[0012] Furthermore, the working section of the first positioning pillar is provided with a buffer layer or an elastic material layer on its side to provide buffer protection when in contact with the edge of the product to be tested.

[0013] Furthermore, the top of the working section of the second positioning pillar is provided with an arc-shaped or spherical contact surface to reduce the contact area with the bottom surface of the product to be tested.

[0014] Furthermore, the positioning holes are arranged in a matrix uniformly on the measuring platform, with a spacing of 5-20mm between adjacent positioning holes.

[0015] The beneficial effects of this utility model are: This invention relates to a positioning device for a laser flatness measuring instrument, comprising a measuring platform with multiple evenly distributed positioning holes; multiple first positioning supports pluggable into the positioning holes for lateral positioning of the product under test; and multiple second positioning supports pluggable into the positioning holes for supporting the bottom surface of the product under test. The height of the first positioning supports is greater than the height of the second positioning supports, so that the top of the first positioning supports is higher than the upper surface of the product under test, and the top of the second positioning supports forms a point support with the bottom surface of the product under test. In use, by selectively inserting the two types of supports at different positions, the first positioning supports restrict the lateral movement of the product, while the second positioning supports suspend the product, creating a gap between the bottom surface of the product and the measuring platform, completely eliminating the influence of the air isolation layer. This invention effectively improves measurement accuracy and stability by replacing surface support with point support, and achieves universal measurement of products of different specifications through the flexible arrangement of pluggable supports. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is an assembly diagram of the present invention; Figure 2This is a side view of the first positioning support of this utility model; Figure 3 This is a side view of the second positioning support of this utility model; Figure 4 This is a top view schematic diagram of the measuring platform of this utility model.

[0018] in, 1. Measuring platform; 11. Positioning holes; 2. First positioning pillar; 3. Second positioning pillar; 4. Pin section; 5. Limiting section; 6. Working section; 7. Laser measuring instruments; 8. Product to be tested. Detailed Implementation

[0019] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0020] This embodiment provides a positioning device for a laser flatness measuring instrument. This positioning device is mainly used for flatness measurement of glass covers and is suitable for glass cover inspection of electronic products such as mobile phones, tablets, and smartwatches.

[0021] Reference Figures 1 to 4 The positioning device includes a measuring platform 1, multiple first positioning supports 2, and multiple second positioning supports 3. The measuring platform 1 is made of aluminum alloy, which has good processing performance and stability, ensuring the flatness requirements of the platform. Multiple evenly distributed positioning holes 11 are provided on the measuring platform 1. These positioning holes 11 are arranged in a matrix, with the spacing between adjacent positioning holes 11 set to 5-20 mm, preferably 10 mm. The specific spacing can be selected according to testing requirements to accommodate the measurement needs of products of different sizes. The positioning holes 11 have a pin-hole structure, matching the insertion ends of the first positioning supports 2 and the second positioning supports 3, achieving a pluggable connection.

[0022] Specifically, both the first positioning pillar 2 and the second positioning pillar 3 are made of acetal steel. The hardness of acetal steel is lower than that of the glass product to be tested, which can effectively prevent scratches when in contact with the product to be tested 8.

[0023] Reference Figure 2 , 3 Both types of support columns have a stepped shaft structure, which includes a pin section 4, a limiting section 5 and a working section 6 in sequence along the axial direction.

[0024] The pin section 4 forms the lower end of the support column, and its outer diameter is adapted to the diameter of the positioning hole 11, so that it can be stably inserted into the positioning hole 11.

[0025] The limiting section 5 is located between the pin section 4 and the working section 6. Its outer diameter is larger than that of the pin section 4. The lower end face of the limiting section 5 forms a limiting surface for abutting against the upper surface of the measuring platform 1. When the support is inserted into the positioning hole 11, the limiting section 5 can limit the insertion depth of the support and ensure that the installation height of each support is consistent.

[0026] Working section 6 forms the upper end of the support column, extending upward from the upper end of limiting section 5.

[0027] The axial length of the working section 6 of the first positioning support 2 is greater than the axial length of the working section 6 of the second positioning support 3, so that the top of the working section 6 of the first positioning support 2 is higher than the upper surface of the product under test 8 after it is placed, while the top of the working section 6 of the second positioning support 3 forms the support surface of the product under test 8. Because the height of the first positioning support 2 is greater than the thickness of the product under test 8, it is mainly used for lateral positioning of the product under test 8 and restricts the lateral movement of the product; the second positioning support 3 is used to support the bottom surface of the product under test 8, suspending the product above the measuring platform 1.

[0028] In operation, the operator first inserts at least four first positioning supports 2 at corresponding positions on the measuring platform 1 according to the dimensions of the glass cover to be measured. These four first positioning supports 2 are arranged on the measuring platform 1 to form an L-shaped positioning angle structure, which is used to position two adjacent sides of the product 8 to be measured, ensuring that the product does not undergo lateral displacement during the measurement process. Then, at least three second positioning supports 3 are inserted at appropriate positions inside the L-shaped positioning angle. These second positioning supports 3 form a three-point or more support structure on the bottom surface of the product 8 to be measured. According to the principles of mechanics, three-point support can form a stable support plane and prevent the product from shaking.

[0029] After the glass cover is placed on the positioning device, its two adjacent edges contact the side of the working section 6 of the first positioning support 2, achieving lateral positioning; the bottom surface is supported by the top of the working section 6 of the second positioning support 3, creating a gap between the bottom surface of the glass cover and the measuring platform 1. This suspended support method solves the problem of air isolation layer caused by traditional planar contact, allowing air to circulate freely and preventing product floating and drifting, thereby greatly improving measurement accuracy.

[0030] The working principle of this invention lies in replacing surface support with point support, thus eliminating the influence of the air isolation layer. In traditional solid-surface platform measurements, a sealed air layer forms between the smooth glass cover and the flat measuring platform 1. When the product is placed, the air cannot be completely expelled, creating an air cushion-like effect that causes the product to float and drift, severely affecting measurement accuracy. This device, however, uses multiple support points to suspend and support the product, and the gap between the bottom surface and the platform allows for free airflow, solving the air isolation layer problem. Simultaneously, point contact significantly reduces the contact area compared to surface contact, lowering the risk of scratches or contamination on the product surface.

[0031] In some embodiments, the working section 6 of the first positioning post 2 is provided with a buffer layer or an elastic material layer on its side. The buffer layer can be made of elastic materials such as silicone, rubber or polyurethane, and has a thickness of 0.5-2mm. When the edge of the glass cover to be tested comes into contact with the first positioning post 2, the buffer layer can provide buffer protection, further reducing the risk of the glass edge being damaged, and can also adapt to the positioning requirements of glass cover plates of different thicknesses.

[0032] In some embodiments, the top of the working section 6 of the second positioning pillar 3 is provided with an arc-shaped or spherical contact surface, preferably a spherical contact surface with a radius of 2-5 mm. This transforms line or surface contact into point contact, further reducing the contact area with the bottom surface of the product under test 8. Taking the measurement of a mobile phone glass cover as an example, the contact area of ​​a traditional platform can reach thousands of square millimeters, while when supported by the second positioning pillar 3 with three spherical contact surfaces, the total contact area can be controlled within 3 square millimeters, greatly reducing the contact area and significantly lowering the risk of scratches and contamination.

[0033] In some embodiments, taking a mobile phone glass cover with a measurement size of 150×70mm as an example, refer to... Figure 1 First, select suitable positions for the positioning holes 11 on the measuring platform 1, and insert four first positioning supports 2. Two supports are inserted at 120mm intervals along the long side of the product, and the other two supports are inserted at 50mm intervals along the short side of the product, forming an L-shaped positioning angle. Then, inside the L-shaped positioning angle, insert three second positioning supports 3 in a triangular layout, located near the three corners of the bottom surface of the product, to ensure stable support.

[0034] Gently place the glass cover plate on the positioning device, ensuring its two adjacent edges are against the first positioning support 2, with the bottom surface supported by three second positioning supports 3. At this point, the glass cover plate is stably suspended and fixed, maintaining a gap of approximately 10mm between its bottom surface and the measuring platform 1. Start the laser measuring instrument 7 and perform laser dot measurement on the surface of the glass cover plate according to the preset program. The laser measuring instrument 7 can accurately measure the height value of each point and calculate the flatness data of the product.

[0035] When measuring products of different sizes, such as replacing a 200×100mm tablet glass cover, simply remove the first positioning support 2 and the second positioning support 3, and re-insert them into the appropriate positioning hole 11. The entire switching process takes only 1-2 minutes, significantly improving efficiency compared to the traditional method that requires replacing a dedicated base. The high compatibility of this device allows it to meet the measurement needs of various product specifications, from small glass covers for smartwatches to large glass covers for tablets. This positioning device not only solves the measurement accuracy problem but also significantly improves product appearance quality control, providing reliable measurement assurance for the high-precision manufacturing of glass covers.

[0036] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A positioning device for a laser flatness measuring instrument, characterized in that, include: A measuring platform, wherein the measuring platform is provided with a plurality of evenly distributed positioning holes; Multiple first positioning pillars are pluggably installed in the positioning holes for side positioning of the product to be tested. Multiple second positioning supports are pluggably installed in the positioning holes to support the bottom surface of the product under test. Wherein, the height of the first positioning post is greater than the height of the second positioning post, the top of the first positioning post is higher than the upper surface of the product under test, and the top of the second positioning post contacts the bottom surface of the product under test to form point support. In use, the first positioning pillar and the second positioning pillar are selectively inserted into the positioning holes at different positions on the measuring platform. The first positioning pillar forms a positioning structure to restrict the lateral movement of the product under test, and the second positioning pillar suspends and supports the product under test above the measuring platform, so that a gap is formed between the bottom surface of the product under test and the measuring platform.

2. The positioning device according to claim 1, characterized in that, The first positioning pillar is set to at least four. When in use, the four first positioning pillars are arranged on the measuring platform to form an L-shaped positioning angle structure, which is used to position the two adjacent sides of the product to be measured.

3. The positioning device according to claim 1, characterized in that, The second positioning pillar is set to at least three, and when in use, the second positioning pillar forms a support structure of three or more points on the bottom surface of the product to be tested.

4. The positioning device according to claim 1, characterized in that, The measuring platform is made of aluminum alloy, and the positioning hole is a pin hole that matches the insertion end of the first positioning support and the second positioning support.

5. The positioning device according to claim 1, characterized in that, The first and second positioning pillars are made of materials with a hardness lower than that of the glass product being tested, in order to avoid scratching the product when in contact with it.

6. The positioning device according to claim 5, characterized in that, Both the first and second positioning supports are made of P-type steel.

7. The positioning device according to claim 1, characterized in that, Both the first and second positioning pillars have a stepped shaft structure, which includes a pin section, a limiting section and a working section in sequence along the axial direction. The pin segment forms the lower end of the support column, and its outer diameter is adapted to the diameter of the positioning hole; The limiting segment is located between the pin segment and the working segment, and its outer diameter is larger than that of the pin segment. The lower end face of the limiting segment forms a limiting surface for abutting against the upper surface of the measuring platform. The working section forms the upper end of the support column, and extends upward from the upper end face of the limiting section; Wherein, the axial length of the working section of the first positioning pillar is greater than the axial length of the working section of the second positioning pillar, such that the top of the working section of the first positioning pillar is higher than the upper surface of the product to be tested after it is placed, and the top of the working section of the second positioning pillar constitutes the support surface of the product to be tested.

8. The positioning device according to claim 7, characterized in that, The working section of the first positioning pillar is provided with a buffer layer or an elastic material layer on its side to provide buffer protection when it comes into contact with the edge of the product to be tested.

9. The positioning device according to claim 7, characterized in that, The working section of the second positioning support has an arc-shaped or spherical contact surface at its top to reduce the contact area with the bottom surface of the product to be tested.

10. The positioning device according to claim 1, characterized in that, The positioning holes are arranged in a matrix uniformly on the measuring platform, with a spacing of 5-20mm between adjacent positioning holes.

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