Metrology-assisted fixture and metrology apparatus

Abstract

This utility model belongs to the technical field of measurement equipment, and discloses a measurement auxiliary fixing fixture and a measurement device. The measurement auxiliary fixing fixture includes an outer wall fixing component and an inner wall fixing component. The outer wall fixing component includes a frame and an elastic clamping component. The frame has a receiving groove for accommodating the object to be measured, and the periphery of the receiving groove has a mounting hole penetrating the frame. The elastic clamping component is rotatably mounted in the mounting hole to selectively press against or detach from the object to be measured. The inner wall fixing component includes a support frame and a material support block. The support frame is fixed to the inner side of the frame, and the material support block is disposed on the support frame and used to support the inner wall of the object to be measured. The support frame has a first air passage inside, and the top of the material support block has a suction opening connected to the first air passage. The first air passage is used to deliver negative pressure airflow to the suction opening to adsorb the object to be measured onto the material support block, thereby solving the problem of displacement of the object to be measured during the measurement process and improving the accuracy and stability of the measurement.

Description

Technical Field

[0001] This utility model relates to the field of measurement equipment technology, and in particular to measurement auxiliary fixtures and measurement equipment. Background Technology

[0002] Contact lens cases are typically made of transparent plastic granules, injection molded using a molding process. Their inner walls have specific grooves or curved surfaces to secure the lens. Because the product's functionality requires extremely high dimensional accuracy, its critical dimensions must be rigorously inspected using precision measuring equipment after manufacturing.

[0003] Currently, during the testing process, when the bottom surface of the contact lens case is placed horizontally on the measurement platform, although image measurement technology can be used to obtain some visible dimensions such as the inner and outer diameters, there are blind spots in the image measurement for critical dimensions such as the depth of the inner wall groove, the curvature of the surface, and the uniformity of the wall thickness, making it difficult to achieve effective detection. When using probe measurement technology, because the protective case material is relatively soft and the structure is thin, the external force generated at the moment of probe contact in a freely placed state can easily cause the product to shift, making it impossible to obtain accurate measurement data.

[0004] Therefore, there is an urgent need for measurement auxiliary fixtures to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a measurement auxiliary fixture and measurement equipment to solve the problem of displacement of the object under test during the measurement process, thereby improving the accuracy and stability of the measurement.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Measurement auxiliary fixtures include:

[0008] An outer wall fixing assembly includes a frame and an elastic clamping assembly. The frame has a receiving groove for accommodating the test object, and the periphery of the receiving groove has a mounting hole that passes through the frame. The elastic clamping assembly is rotatably mounted in the mounting hole to selectively press against or detach from the test object.

[0009] The inner wall fixing assembly includes a support frame and a material support block. The support frame is fixed to the inner side of the frame, and the material support block is disposed on the support frame and used to support the inner wall of the object to be tested. The support frame has a first air channel inside, and the top of the material support block has a suction opening that communicates with the first air channel. The first air channel is used to deliver negative pressure airflow to the suction opening to adsorb the object to be tested onto the material support block.

[0010] As an optional solution for the measurement auxiliary fixing fixture, the mounting hole is a stepped hole, which includes a first diametrical section and a second diametrical section arranged coaxially; the elastic clamping assembly includes:

[0011] The column includes a rod portion and a limiting portion connected to each other. The rod portion is slidably engaged with the first diameter segment. The outer diameter of the limiting portion is larger than the inner diameter of the first diameter segment. The end of the rod portion away from the limiting portion is provided with a threaded hole.

[0012] A pressure plate and a first fastener, the first fastener passing through the pressure plate and threadedly connected to the threaded hole, the pressure plate being used to selectively press against the object to be tested;

[0013] An elastic element is sleeved on the rod body. The elastic element is located within the second diameter section. One end of the elastic element abuts against the limiting part, and the other end of the elastic element abuts against the stepped surface of the stepped hole.

[0014] As an optional solution for measurement auxiliary fixtures, the end of the pressure plate away from the first fastener is provided with a U-shaped groove, the depth of which is greater than the width of the bottom wall of the object to be measured.

[0015] As an optional solution for the measurement auxiliary fixing fixture, the outer wall fixing component also includes a limiting member, which is fixedly connected to the frame to limit the rotation angle of the elastic clamping component.

[0016] As an optional solution for measurement auxiliary fixtures, the frame is provided with a second air passage, and the inner wall fixing assembly also includes a connecting pipe. The two ends of the connecting pipe are used to connect the first air passage and the second air passage, respectively. The second air passage is configured to connect to an external air source and is provided with a reverse air valve and a throttle valve.

[0017] As an optional solution for the measurement auxiliary fixing fixture, the inner wall fixing assembly also includes a sealing ring and a second fastener. The end of the support frame is provided with a vacuum groove. The bottom of the vacuum groove is provided with at least one first suction hole that communicates with the first air passage inside. The groove opening of the vacuum groove is connected to the material support block. The second fastener passes through the material support block and is fixedly connected to the vacuum groove. The sealing ring is built into the joint gap between the vacuum groove and the material support block to seal the connection.

[0018] As an optional solution for the measurement auxiliary fixture, the material support block is a cylindrical shell. A second suction hole communicating with the vacuum groove is opened on the bottom wall of the cylindrical shell. Several support ribs are arranged in a ring on the inner peripheral wall of the cylindrical shell. The support ribs are radially directed towards the center of the cylindrical shell. The top of the cylindrical shell is the material suction opening.

[0019] As an optional solution for measurement auxiliary fixtures, the frame is a rectangular frame with equal-height columns fixed at the four corners of the bottom surface of the frame, and the four equal-height columns are of equal height.

[0020] The measuring device includes a measuring instrument with a measuring platform and a measuring auxiliary fixture as described in any one of claims 8, the measuring auxiliary fixture being fixed on the measuring platform.

[0021] As an optional measurement device, the measuring instrument can be an image measuring instrument or a probe measuring instrument.

[0022] Beneficial effects:

[0023] This utility model provides a measurement auxiliary fixing fixture and measuring equipment. Through the differentiated design of the outer wall fixing component and the inner wall fixing component, it achieves precise alternating fixation of the outer and inner walls of the object under test. In the outer wall fixing component, the frame's receiving groove, combined with a rotatable elastic clamping component, can quickly and stably fix the outer wall of the object under test, leaving the inner wall completely exposed, creating conditions for measuring the inner wall dimensions. Meanwhile, the inner wall fixing component utilizes a material support block on the support frame combined with a negative pressure adsorption air channel to firmly fix the inner wall of the object under test. At this time, the outer wall of the object under test is unobstructed, facilitating comprehensive detection of the outer wall dimensions. This design, through the alternating fixation of the outer and inner walls, eliminates the risk of displacement of the object under test during measurement, achieves full coverage detection of the dimensions of all parts of the object under test, significantly improves the integrity and accuracy of the measurement data, simplifies the measurement process, and greatly improves the detection efficiency. Attached Figure Description

[0024] Figure 1 This is a first schematic diagram of the measurement auxiliary fixing fixture provided in this embodiment of the utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the elastic clamping assembly provided in this embodiment of the utility model;

[0027] Figure 4 This is a second schematic diagram of the measurement auxiliary fixing fixture provided in this embodiment of the utility model;

[0028] Figure 5 yes Figure 4 Enlarged view at point B in the middle;

[0029] Figure 6 This is a first schematic diagram of the test object provided in this embodiment of the utility model;

[0030] Figure 7 This is a second schematic diagram of the test object provided in an embodiment of this utility model.

[0031] In the picture:

[0032] 100. The object to be tested; 101. Inner wall; 102. Outer wall;

[0033] 1. External wall fixing assembly; 11. Frame; 111. Receiving groove; 112. Mounting hole; 113. Second air passage; 1121. First diameter section; 1122. Second diameter section; 1123. Stepped surface;

[0034] 12. Elastic clamping assembly; 121. Column; 122. Pressure plate; 123. First fastener; 124. Elastic element; 1211. Rod body; 1212. Limiting part; 1213. Threaded hole; 1221. U-shaped groove;

[0035] 13. Limiting components;

[0036] 2. Inner wall fixing assembly; 21. Support frame; 22. Material support block; 23. Connecting pipe; 211. First air passage; 212. Vacuum tank; 213. First suction port; 221. Second suction port; 222. Support rib;

[0037] 3. Contour columns. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0039] In the description of this utility model, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of the device. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper" and "lower," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] This embodiment provides a measuring device, including a measuring instrument (not shown) with a measuring platform and a measuring auxiliary fixture, which is fixed on the measuring platform. The measuring platform is horizontally positioned, and the measuring auxiliary fixture is used to fix the object to be measured 100, ensuring that the object to be measured 100 remains stationary during the operation of the measuring instrument, thus providing stable support for accurate measurement.

[0043] like Figure 6 and Figure 7 As shown, in this embodiment, the object to be tested 100 is a contact lens protective case. The contact lens protective case has an inner wall 101 and an outer wall 102. The inner wall 101 is provided with a specific groove or curved surface for securing the lens. In this embodiment, the measuring instrument is an image measuring instrument or a probe measuring instrument. The image measuring instrument, through high-definition imaging and image processing technology, can quickly capture the two-dimensional contour and surface features of the object to be tested 100, and is particularly suitable for detecting visible dimensions such as the inner and outer diameters and surface flatness of the contact lens protective case, avoiding the errors and efficiency problems of manual measurement; while the probe measuring instrument, by relying on the contact between the high-precision probe and the object being measured, can deeply measure the internal structural dimensions of the contact lens protective case, such as the groove depth and surface curvature of the inner wall 101.

[0044] In this embodiment, as Figures 1-5 As shown, the measurement auxiliary fixing fixture includes an outer wall fixing component 1 and an inner wall fixing component 2. The outer wall fixing component 1 includes a frame 11 and an elastic clamping component 12. The frame 11 is provided with a receiving groove 111 for accommodating the object to be measured 100. The periphery of the receiving groove 111 is provided with a mounting hole 112 that passes through the frame 11. The elastic clamping component 12 is rotatably installed in the mounting hole 112 to selectively press against or detach from the object to be measured 100. The inner wall fixing component 2 includes a support frame 21 and a material support block 22. The support frame 21 is fixed to the inner side of the frame 11. The material support block 22 is disposed on the support frame 21 and is used to support the inner wall 101 of the object to be measured 100. The support frame 21 is provided with a first air passage 211. The top of the material support block 22 is provided with a suction opening that communicates with the first air passage 211. The first air passage 211 is used to deliver negative pressure airflow to the suction opening to adsorb the object to be measured 100 onto the material support block 22.

[0045] Through the differentiated design of the outer wall fixing component 1 and the inner wall fixing component 2, the outer wall 102 and inner wall 101 of the test object 100 are alternately and precisely fixed. In the outer wall fixing component 1, the receiving groove 111 of the frame 11, together with the rotatable elastic clamping component 12, can quickly and stably fix the outer wall 102 of the test object 100, so that the inner wall 101 of the test object 100 is in a completely exposed state, creating conditions for measuring the size of the inner wall 101. The inner wall fixing component 2, using the material support block 22 on the support frame 21 in combination with the negative pressure adsorption air channel, can firmly fix the inner wall 101 of the test object 100. At this time, the outer wall 102 of the test object 100 is unobstructed, which facilitates the comprehensive detection of the size of the outer wall 102. This design, through the alternating fixation of the outer wall 102 and the inner wall 101, not only eliminates the potential displacement of the object 100 during the measurement process, but also achieves full coverage detection of the dimensions of all parts of the object 100, significantly improving the integrity and accuracy of the measurement data, while simplifying the measurement process and greatly improving the detection efficiency.

[0046] Both the image blurring caused by the shaking of the object 100 during non-contact measurement with an image measuring instrument and the measurement deviation caused by the displacement of the object 100 during contact measurement with a probe measuring instrument can be effectively solved. Therefore, the combination of these two measuring instruments with the auxiliary measuring fixture significantly improves the accuracy and efficiency of the inspection, ensuring that all key dimensions of the object 100 can be accurately and comprehensively measured, providing a reliable basis for product quality control.

[0047] In this embodiment, the number of receiving slots 111 can be one, two, three, etc., and is not limited here; the number of material support blocks 22 can also be one, two, three, etc., and is not limited here. When the number of receiving slots 111 and material support blocks 22 is greater than one, multiple measuring instruments of the corresponding number can be set up simultaneously to perform measurements.

[0048] In this embodiment, the diameter of the receiving groove 111 is designed to match the outer diameter of the object to be tested 100, forming a suitable assembly space so that the object to be tested 100 can be smoothly placed into the receiving groove 111 and maintain a natural positioning state. This avoids the risk of deformation of the object to be tested 100 caused by excessive tightness, and the groove wall of the receiving groove 111 limits the radial movement of the object to be tested 100 by limiting the outer wall 102 of the object to be tested 100, providing a basic positioning for the precise pressing of the subsequent elastic pressing component 12.

[0049] like Figure 3As shown, the mounting hole 112 is a stepped hole, which includes a first diameter section 1121 and a second diameter section 1122 coaxially arranged. The diameter of the second diameter section 1122 is larger than the diameter of the first diameter section 1121. The elastic clamping assembly 12 includes a column 121, a pressure plate 122, a first fastener 123, and an elastic element 124. The column 121 includes a rod portion 1211 and a limiting portion 1212 connected to each other. The rod portion 1211 is slidably engaged with the first diameter section 1121. The outer diameter of the limiting portion 1212 is larger than that of the first diameter section 1121. The inner diameter of the first diameter section 1121 is such that the end of the rod body 1211 facing away from the limiting part 1212 is provided with a threaded hole 1213; the first fastener 123 passes through the pressure plate 122 and is threadedly connected to the threaded hole 1213, and the pressure plate 122 is used to selectively press against the test object 100; the elastic element 124 is sleeved on the rod body 1211, and the elastic element 124 is located in the second diameter section 1122, one end of the elastic element 124 abuts against the limiting part 1212, and the other end of the elastic element 124 abuts against the stepped surface 1123 of the stepped hole. The mounting hole 112 adopts a stepped hole design, the first diameter section 1121 of the mounting hole 112 slides with the rod body 1211 of the column 121 to provide precise guidance for the elastic clamping assembly 12, and the second diameter section 1122 allows the limiting part 1212 to move within a certain range and prevents the column 121 from falling off. When installing the test object 100, first rotate the pressure plate 122 to a position that does not obstruct the receiving groove 111, making room for the placement of the test object 100. Then, place the test object 100 smoothly into the receiving groove 111, at which point the bottom edge of the test object 100 just overlaps the opening edge of the receiving groove 111, completing the initial positioning. Next, rotate the pressure plate 122 in the opposite direction to cover the test object 100, and at the same time apply an external force in the axial direction, causing the column 121 connected to the pressure plate 122 to move, so that the elastic element 124 sleeved on the rod part 1211 is stretched. During the stretching process of the elastic element 124, a contraction force is generated inside the elastic element 124. This contraction force is transmitted to the pressure plate 122 through the column 121, so that the pressure plate 122 tightly presses against the bottom edge of the test object 100 that is higher than the receiving groove 111, thereby fixing the test object 100. This clamping method, which utilizes the elastic element 124 to generate contraction force through stretching, can adaptively adjust the pressure according to the actual size and shape of the object to be measured 100. While ensuring the stable fixation of the object to be measured 100, it avoids deformation of the object to be measured 100 due to excessive pressure, providing a reliable guarantee for subsequent high-precision measurement using image measuring instruments or probe measuring instruments.

[0050] Optionally, the first fastener 123 is a long bolt, with the bolt head clamping the pressure plate 122 between the end face of the rod body 1211. Optionally, the elastic element 124 is a spring, which is sleeved on the rod body 1211, with one end of the spring abutting against the limiting part 1212 and the other end of the spring abutting against the stepped surface 1123 of the stepped hole.

[0051] like Figure 2 As shown, the end of the pressure plate 122 away from the first fastener 123 is provided with a U-shaped groove 1221, the depth of which is greater than the width of the bottom wall of the object to be measured 100. The pressure plate 122 is cuboid, and the U-shaped groove 1221 is formed on the cuboid. By reducing the contact area between the pressure plate 122 and the bottom wall, the contact pressure is increased when the elastic member 124 applies pressure, thus enhancing the clamping force. In addition, the reduced contact area can also reduce the obstruction of the measurement area by the pressure plate 122, retaining more of the visible range for image measurement, while reducing the risk of interference during probe measurement, and improving measurement compatibility while ensuring fixation stability.

[0052] like Figure 1 , such as 2 and Figure 4 As shown, the outer wall fixing assembly 1 also includes a limiting member 13, which is fixedly connected to the frame 11 and used to limit the rotation angle of the elastic clamping assembly 12. The limiting member 13 is cylindrical, and the object to be tested 100 is reliably fixed by the rotation angle of the pressure plate 122. During the rotation of the pressure plate 122, when the pressure plate 122 abuts against the limiting member 13, the pressure plate 122 points to the axis of the receiving groove 111, ensuring that the pressure is evenly distributed radially along the object to be tested 100 when it abuts against the object to be tested 100, avoiding excessive local pressure or unstable fixing due to angular deviation, and effectively preventing the object to be tested 100 from shifting or tilting during the measurement process. At the same time, the setting of the limiting member 13 provides the operator with a clear installation and operation benchmark, eliminating the need to repeatedly adjust the angle of the pressure plate 122, and greatly improving the fixing efficiency of the object to be tested 100. In addition, the fixed rotation angle ensures the consistency of the position of the pressure plate 122 during each measurement, ensuring the repeatability and accuracy of the measurement data.

[0053] In this embodiment, four elastic clamping components 12 are equally spaced around the periphery of a receiving groove 111, and each elastic clamping component 12 is provided with a limiting member 13. In other embodiments, one, two, three, or five elastic clamping components 12 are equally spaced around the periphery of a receiving groove 111, and each elastic clamping component 12 is provided with a limiting member 13. The number of elastic clamping components 12 and limiting members 13 is not limited here.

[0054] like Figure 5As shown, the frame 11 is provided with a second air passage 113, and the inner wall fixing component 2 also includes a connecting pipe 23. The two ends of the connecting pipe 23 are respectively used to connect the first air passage 211 and the second air passage 113. The second air passage 113 is configured to connect to an external air source and is provided with a reverse air valve and a throttle valve. The second air passage 113 provided in the frame 11 and the connecting pipe 23 of the inner wall fixing component 2 cooperate with each other to form a stable negative pressure delivery pipeline. The two ends of the connecting pipe 23 are respectively connected to the first air passage 211 and the second air passage 113, transmitting the gas from the external air source to the material support block 22 of the inner wall fixing component 2 to form a negative pressure airflow that adsorbs the test object 100. The reverse air valve configured in the second air passage 113 can effectively prevent gas backflow, ensure the stability of the negative pressure airflow, avoid the sudden drop in adsorption force caused by backflow of airflow, and ensure that the test object 100 is always firmly adsorbed during the measurement process. The throttle valve can precisely control the negative pressure by adjusting the gas flow rate, which can not only meet the adsorption requirements of test objects 100 of different materials and weights, but also avoid damage to fragile or flexible test objects 100 due to excessive negative pressure. At the same time, it can also adjust the adsorption force in real time according to the measurement conditions, enhancing the applicability and flexibility of the measurement auxiliary fixing fixture.

[0055] In this embodiment, an air compressor is selected as the external air source, and an air valve switch is provided between the second air passage 113 and the external air source to open or close the external air source.

[0056] like Figure 1 As shown, the inner wall fixing assembly 2 also includes a sealing ring (not shown) and a second fastener (not shown). The support frame 21 has a vacuum groove 212 at its end. The bottom of the vacuum groove 212 has at least one first suction hole 213 communicating with the internal first air passage 211. The groove opening of the vacuum groove 212 is connected to a material support block 22. The second fastener (e.g., bolt, screw) passes through the material support block 22 and is fixedly connected to the vacuum groove 212. A sealing ring is built into the joint between the vacuum groove 212 and the material support block 22 for a sealed connection. In the inner wall fixing assembly 2, the second fastener passes through the material support block 22 and is firmly connected to the vacuum groove 212, forming a stable mechanical connection. This prevents the material support block 22 from shifting during negative pressure adsorption and frequent loading and unloading, ensuring the accuracy and consistency of the adsorption position of the test object 100. Meanwhile, a sealing ring is installed in the assembly gap between the vacuum tank 212 and the material support block 22. Its elastic properties allow it to tightly fit the contact surfaces of the two components, effectively filling the gaps caused by processing or assembly, blocking gas leakage paths, and ensuring that the negative pressure of the first air channel 211 acts on the test object 100 only through the suction hole at the bottom of the vacuum tank 212. This sealing design avoids the decrease in adsorption force due to air leakage, ensuring the stability of negative pressure adsorption, improving adsorption efficiency, and reducing gas source energy consumption. During the measurement process, stable negative pressure adsorption can prevent the test object 100 from undergoing slight displacement, providing clear and stable imaging conditions for image measurement, and ensuring accurate contact positioning for probe measurement, significantly improving the reliability of the measurement results.

[0057] like Figure 1 and Figure 5 As shown, the material support block 22 is a cylindrical shell. A second suction port 221, connecting to the vacuum groove 212, is opened on the bottom wall of the cylindrical shell. Several supporting ribs 222 are arranged in a ring on the inner circumferential wall of the cylindrical shell, radiating towards the center of the cylindrical shell. The top of the cylindrical shell is an open suction port. The material support block 22, with its cylindrical shell structure, combined with the internal supporting ribs 222 and the second suction port 221, effectively improves structural strength and airflow efficiency while ensuring stable adsorption of the analyte 100. Specifically, a second suction port 221 is provided on the bottom wall of the cylindrical shell, forming a through air passage with the first suction port 213 at the bottom of the vacuum tank 212. This ensures that the negative pressure is uniformly transmitted to the suction opening, achieving efficient adsorption of test objects 100 of different shapes. The radial support ribs 222 in a ring array on the inner circumferential wall, on the one hand, enhance the shell's resistance to deformation, preventing the cylindrical shell from collapsing under long-term negative pressure and ensuring the air passage's sealing. On the other hand, the flow channels formed between the support ribs 222 optimize airflow distribution, reduce gas flow resistance, and allow the negative pressure to act more quickly and uniformly on the surface of the test object 100, improving the adsorption response speed. Furthermore, the suction opening design expands the adsorption area, accommodating test objects 100 of various sizes, while also facilitating quick loading and unloading of the test objects 100 by operators, improving measurement efficiency.

[0058] In this embodiment, the material support block 22 is a flexible material support block 22. The flexible material support block 22 is made of PEEK block or POM block. The flexible material of PEEK / POM provides elastic buffer contact to the surface of the object to be tested 100, thereby avoiding damage to the surface of the object to be tested 100.

[0059] like Figure 1 As shown, the frame 11 is a rectangular frame, with equal-height columns 3 fixed at the four corners of its bottom surface. The four equal-height columns 3 are of equal height. This uniform height effectively eliminates tilting or swaying caused by uneven ground or external forces. This design ensures that the measurement platform (the upper surface of the measurement auxiliary fixing fixture) remains level, preventing positioning deviations of the object to be measured 100 due to frame 11 tilting, thus guaranteeing the accuracy of the image-based measuring instrument and the precision of the probe-based measuring instrument during contact measurement. Simultaneously, the evenly distributed structure of the equal-height columns 3 distributes the weight of the frame 11 and the measuring equipment, reducing local pressure, preventing frame 11 deformation, and extending its service life. Operators do not need complex leveling operations; simply placing the equal-height columns 3 on a flat surface is sufficient to quickly position the frame 11, significantly improving measurement preparation efficiency.

[0060] In this embodiment, the contour column 3 and the frame 11 are bolted together, and both ends of the support frame 21 are also bolted to the frame 11. The frame 11 and the support components are made of alloy materials, which have anti-corrosion properties to ensure the service life of the measurement auxiliary fixing fixture.

[0061] The working process of the measuring device in this embodiment is roughly as follows:

[0062] First, the frame 11 is placed stably on the measurement platform using the four corner columns 3 of equal height on the bottom surface, ensuring that the tooling is in a horizontal reference state;

[0063] Then, rotate the pressure plate 122 to make the U-shaped groove 1221 deviate from the receiving groove 111, and gently place the object to be tested 100 into the groove, so that its bottom wall edge naturally overlaps the opening of the receiving groove 111. Next, rotate the pressure plate 122 until it abuts against the limiting member 13. At this time, the pressure plate 122 is precisely aligned with the axis of the receiving groove 111. Under the contraction force of the elastic member 124, the pressure plate 122 firmly presses against the bottom wall of the object to be tested 100, and the measuring instrument begins to measure the inner wall 101 of the object to be tested 100.

[0064] After the inner wall 101 is measured, the object to be tested 100 is removed and placed on the support block 22. The external air source is delivered through the second air channel 113. After being precisely controlled by the throttle valve and the reverse air valve, it is introduced into the first air channel 211 through the connecting pipe 23. Finally, a negative pressure is formed through the first suction hole 213 of the vacuum tank 212 and the second suction hole 221 of the support block 22, which firmly adsorbs the object to be tested 100 onto the suction opening. The measuring instrument can then measure the outer wall 102 of the object to be tested, completing a complete measurement process.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A measurement auxiliary fixture, characterized in that, include: The outer wall fixing assembly (1) includes a frame (11) and an elastic clamping assembly (12). The frame (11) is provided with a receiving groove (111) for receiving the object to be tested (100). The periphery of the receiving groove (111) is provided with a mounting hole (112) that passes through the frame (11). The elastic clamping assembly (12) is rotatably mounted in the mounting hole (112) to selectively press against or detach from the object to be tested (100). The inner wall fixing assembly (2) includes a support frame (21) and a material support block (22). The support frame (21) is fixed to the inner side of the frame (11). The material support block (22) is disposed on the support frame (21) and is used to support the inner wall (101) of the test object (100). The support frame (21) is provided with a first air channel (211). The top of the material support block (22) is provided with a suction opening that communicates with the first air channel (211). The first air channel (211) is used to deliver negative pressure airflow to the suction opening to adsorb the test object (100) onto the material support block (22).

2. The measurement auxiliary fixing fixture according to claim 1, characterized in that, The mounting hole (112) is a stepped hole, which includes a first diameter section (1121) and a second diameter section (1122) arranged coaxially; the elastic clamping assembly (12) includes: The column (121) includes a rod part (1211) and a limiting part (1212) connected to each other. The rod part (1211) is slidably engaged with the first diameter segment (1121). The outer diameter of the limiting part (1212) is larger than the inner diameter of the first diameter segment (1121). The end of the rod part (1211) opposite to the limiting part (1212) is provided with a threaded hole (1213). A pressure plate (122) and a first fastener (123) are provided. The first fastener (123) passes through the pressure plate (122) and is threadedly connected to the threaded hole (1213). The pressure plate (122) is used to selectively press against the object to be tested (100). An elastic element (124) is sleeved on the rod body (1211). The elastic element (124) is located in the second diameter section (1122). One end of the elastic element (124) abuts against the limiting part (1212), and the other end of the elastic element (124) abuts against the stepped surface (1123) of the stepped hole.

3. The measurement auxiliary fixture according to claim 2, characterized in that, The pressure plate (122) has a U-shaped groove (1221) at one end away from the first fastener (123), and the depth of the U-shaped groove (1221) is greater than the bottom wall width of the object to be tested (100).

4. The measurement auxiliary fixture according to any one of claims 1-3, characterized in that, The outer wall fixing assembly (1) also includes a limiting member (13), which is fixedly connected to the frame (11) and is used to limit the rotation angle of the elastic pressing assembly (12).

5. The measurement auxiliary fixture according to claim 4, characterized in that, The frame (11) is provided with a second air passage (113), and the inner wall fixing assembly (2) further includes a connecting pipe (23). The two ends of the connecting pipe (23) are respectively used to connect the first air passage (211) and the second air passage (113). The second air passage (113) is configured to connect to an external air source and is provided with a reverse air valve and a throttle valve.

6. The measurement auxiliary fixture according to claim 4, characterized in that, The inner wall fixing assembly (2) also includes a sealing ring and a second fastener. The support frame (21) has a vacuum groove (212) at its end. The bottom of the vacuum groove (212) has at least one first suction hole (213) that communicates with the first internal air passage (211). The groove opening of the vacuum groove (212) is connected to the material support block (22). The second fastener passes through the material support block (22) and is fixedly connected to the vacuum groove (212). The sealing ring is built into the joint gap between the vacuum groove (212) and the material support block (22) for sealing connection.

7. The measurement auxiliary fixture according to claim 6, characterized in that, The material support block (22) is a cylindrical shell. A second suction hole (221) communicating with the vacuum groove (212) is opened on the bottom wall of the cylindrical shell. A plurality of support ribs (222) are arranged in a ring on the inner peripheral wall of the cylindrical shell. The plurality of support ribs (222) are radially directed toward the center of the cylindrical shell. The top of the cylindrical shell is the material suction opening.

8. The measurement auxiliary fixture according to any one of claims 1-3, characterized in that, The frame (11) is a rectangular frame, and equal-height columns (3) are fixed at the four corners of the bottom surface of the frame (11), and the four equal-height columns (3) are of equal height.

9. A measuring device, characterized in that, It includes a measuring instrument with a measuring platform and a measuring auxiliary fixture as described in any one of claims 1-8, wherein the measuring auxiliary fixture is fixed on the measuring platform.

10. The measuring device according to claim 9, characterized in that, The measuring instrument is either an image measuring instrument or a probe measuring instrument.

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