Square square perpendicularity calibration device and calibration method

Abstract

The device comprises a working table, a fine adjustment device is movably installed on the working table, a standard cylinder is placed on one side of the fine adjustment device, the back side of the standard cylinder is tightly adjacent and provided with a lamp box, and a light outlet hole is formed in the side, close to the standard cylinder, of the lamp box. A light source and a movable guide rail are further arranged in the lamp box. During detection, a square ruler to be detected is clamped in the fine adjustment device, the working face of the square ruler is tightly attached to the standard cylinder, standard light gaps of different sizes are sequentially projected to a contact area through the light outlet holes by moving the guide rail in the lamp box for optical comparison, and when light transmission is observed, the corresponding light gap value is the perpendicularity deviation. A traditional main sightseeing gap method is converted into objective quantitative detection, the precision can reach the micron level, traceability is achieved, the right-angle ruler perpendicularity calibration device is integrally designed and is easy and convenient to operate, a pure mechanical structure is adopted, the cost is low, the environment adaptability is high, and rapid and reliable right-angle ruler perpendicularity calibration can be conveniently achieved on a production site.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of geometric quantity measurement and precision detection, and relates to a right-angle ruler perpendicularity calibration device and a right-angle ruler perpendicularity calibration method. BACKGROUND

[0002] A right-angle ruler is an angle reference tool commonly used in mechanical processing, assembly and quality control, and the perpendicularity precision of the right-angle ruler directly affects product quality. Traditional right-angle ruler calibration methods usually adopt a combination of a flat plate, a square box and a feeler gauge, and are performed by means of a light gap method or a dial gauge method. These methods have a strong dependence on the experience of an operator, have a high requirement for ambient light, and have a large subjectivity of a judgment standard light gap, resulting in unstable measurement precision and efficiency.

[0003] To improve objectivity, a right-angle ruler tester is commonly used in the prior art for detection, and a typical method is as follows: before detection, an activity measurement frame of the tester is adjusted to make a micrometer head contact an edge of a measurement surface of a detected right-angle ruler; during measurement, the right-angle ruler is placed on the left and right sides of the tester respectively, and the measurement direction of the micrometer is switched accordingly, the perpendicularity is calculated by means of a difference between two readings, and half of the difference between the two readings is the perpendicularity of the detected right-angle ruler. However, the measurement process of this method is complicated, and the precision and stability of the tester, especially the micrometer itself, are greatly dependent, and once the micrometer is misaligned, the detection result will be directly incorrect. In addition, such a tester is usually bulky and inconvenient to carry to a production site for rapid calibration. For higher precision detection, although advanced equipment such as a laser interferometer can be used, the cost is extremely high, and the environment and the professional level of an operator are required to be extremely high, and the debugging and measurement process is complicated and time-consuming, and is also not suitable for daily rapid calibration requirements in a workshop.

[0004] Therefore, there is an urgent need in the industry for a right-angle ruler perpendicularity calibration device with high efficiency, low cost, easy operation and convenient on-site use. SUMMARY

[0005] The purpose of the present application is to provide a right-angle ruler perpendicularity calibration device, which solves the problems of complex structure, dependence on subjective experience and complicated operation in the prior art.

[0006] Another purpose of the present application is to provide a right-angle ruler perpendicularity calibration method.

[0007] The technical solution adopted by the present application is a right-angle ruler perpendicularity calibration device, which comprises a workbench, a fine adjustment device movably installed on the workbench, a standard cylinder placed on one side of the fine adjustment device, a light box closely adjacent to and placed on the back side of the standard cylinder, a light outlet hole provided on the side of the light box close to the standard cylinder, and a light source and a movable guide rail provided in the light box.

[0008] The present application has the following characteristics: The workbench is provided with a rectangular mounting groove, and a fine adjustment device is fixedly mounted in the rectangular mounting groove, the fine adjustment device comprises an X-direction adjusting handle and a Y-direction adjusting handle, the X-direction adjusting handle and the Y-direction adjusting handle are arranged in the same horizontal plane which is parallel to a bearing surface of the workbench, operating ends of the X-direction adjusting handle and the Y-direction adjusting handle are exposed from the bearing surface of the workbench, and the X-direction adjusting handle and the Y-direction adjusting handle are used for adjusting a space posture of a work component clamped on the fine adjustment device.

[0009] The fine adjustment device can clamp a detected right-angle ruler, a center line of the light emission hole is opposite to a contact line of the standard cylinder and the detected right-angle ruler, and a central light beam of a light beam emitted by the light emission hole can be perpendicularly incident on a plane in which the contact line of the standard cylinder and the detected right-angle ruler is located.

[0010] A standard light gap generating assembly is slidably connected to the inner guide rail of the light box, the standard light gap generating assembly comprises two first gauge blocks which are fixedly arranged in parallel, at least one second gauge block is arranged between the two first gauge blocks, a knife-edge ruler is arranged on the upper surfaces of the first gauge blocks and the second gauge block, the height of the second gauge block is less than the height of the first gauge block, and the second gauge block is used for forming a gap for light to pass through between the first gauge blocks.

[0011] The height difference between the first gauge block and the second gauge block is 0.001-0.009 mm.

[0012] The second gauge block is a plurality of second gauge blocks, and the sizes of the second gauge blocks continuously change in a stepwise manner from one end to the other end.

[0013] The sizes of the plurality of second gauge blocks are 0.991 mm, 0.992 mm, 0.993 mm, 0.994 mm, 0.995 mm, 0.996 mm, 0.997 mm, 0.998 mm and 0.999 mm respectively. The length of the knife-edge ruler is 30 mm, and the straightness of the knife-edge ruler is not more than 0.3 μm.

[0014] Another technical solution adopted by the present application is a right-angle ruler perpendicularity calibration method, comprising the following steps: Step 1, a standard light gap generating assembly is arranged on the guide rail, and a standard light gap is constructed; Step 2, a standard cylinder is placed on the workbench, a detected right-angle ruler is clamped and fine-adjusted, and a working surface of the detected right-angle ruler is tightly attached to the standard cylinder; Step 3, the light box is placed close to the rear of the standard cylinder, and the light emission hole is opposite to the contact line of the standard cylinder and the detected right-angle ruler; Step 4, the light source is turned on, and the guide rail is moved, so that the standard light gap is sequentially emitted from the light emission hole; Step 5, when stable light transmission is observed for the first time, the size value of the current standard light gap is recorded, and is recorded as a perpendicularity deviation.

[0015] The application also has the characteristics that: The construction of the standard optical gap reference comprises the following steps: Step 101, in the standard optical gap generating assembly, at least one second gauge block is placed between two parallel first gauge blocks as a reference; Step 102, a knife edge ruler is arranged on the upper surfaces of the first gauge block and the second gauge block, the top end of the second gauge block is lower than the top end of the first gauge block, and a standard optical gap with a known height is formed between the second gauge block and the first gauge block; Step 103, the plurality of second gauge blocks are continuously stepped from one end to the other end, so that the standard optical gap generating assembly can generate a continuously increasing standard optical gap when moving along the guide rail.

[0016] Further comprising: after reading the perpendicularity deviation value, changing the contact position of the detected square ruler on the standard cylinder, repeating steps 2-5 for multiple measurements to obtain the perpendicularity deviation distribution of the working surface of the detected square ruler.

[0017] The application has the beneficial effects that: The square ruler perpendicularity calibration device of the application directly compares the measured gap with the optical gap with a known size formed by the standard gauge block combination as a reference, realizes the fundamental change from subjective experience judgment to objective quantitative detection of the traditional optical gap method, effectively eliminates the subjective error due to different people, and guarantees the consistency and fairness of the measurement results. The size of the standard optical gap is directly determined by the size difference of the standard gauge block measured by metrological verification, the theoretical precision can reach microns, and the physical reference is clear. The square ruler perpendicularity calibration device adopts integrated design, users do not need to perform complex calculation or repeated trial and error, and high-precision detection can be completed in a short time, which significantly improves the detection efficiency. In addition, the measurement assembly of the application adopts mature and general standard gauges, gauge blocks and mechanical fine adjustment mechanisms, avoiding expensive electronic sensors or complex optical systems. This not only greatly reduces the manufacturing cost, but also makes the later maintenance and calibration more simple and economical.

[0018] The square ruler perpendicularity calibration device of the application is compact in structure, does not need to rely on a fixed large platform or a specific laboratory environment, and has good portability, so that it can be easily transferred to the production site such as a machine tool or an assembly line, to realize instant and on-site verification of the square ruler. Finally, the square ruler perpendicularity calibration device of the application is a pure mechanical structure without precise electronic components, so it is not easily affected by common environmental factors such as oil stains, dust and electromagnetic interference in the workshop, has small performance degradation during long-term use, has low maintenance requirements, and ensures reliable operation in the industrial site environment.

[0019] The detection precision and range of the right-angle ruler perpendicularity calibration method are significantly improved, the determination result is objective, subjective errors of manual operation and visual judgment are eliminated, and the detection efficiency and reliability are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the right-angle ruler perpendicularity calibration device of the present application; Figure 2 is a schematic diagram of the internal structure of the light box of the right-angle ruler perpendicularity calibration device of the present application; Figure 3 is a schematic diagram of the workbench and fine adjustment device structure of the right-angle ruler perpendicularity calibration device of the present application; Figure 4 is a schematic diagram of the flow of the right-angle ruler perpendicularity calibration method of the present application.

[0021] In the figure: 1. Workbench; 2. Fine adjustment device; 21. X-direction adjustment handle; 22. Y-direction adjustment handle; 3. Standard cylinder; 4. Light box; 41. Light outlet hole; 42. Light source; 43. Guide rail; 5. Standard light gap generating assembly; 51. First gauge block; 52. Second gauge block; 53. Knife-edge ruler; 6. Inspected right-angle ruler. DETAILED DESCRIPTION

[0022] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0023] The right-angle ruler perpendicularity calibration device, as shown in Figure 1 , comprises a workbench 1, a fine adjustment device 2 movably mounted on the workbench 1, a standard cylinder 3 placed on one side of the fine adjustment device 2, and a light box 4 closely adjacent to and placed on the back side of the standard cylinder 3, as shown in Figure 2 , the light box 4 is provided with a light outlet hole 41 on the side close to the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43.

[0024] As shown in Figure 3 , the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove, the fine adjustment device 2 comprises an X-direction adjustment handle 21 and a Y-direction adjustment handle 22, the X-direction adjustment handle 21 and the Y-direction adjustment handle 22 are arranged perpendicularly in the same horizontal plane parallel to the load surface of the workbench 1, the operating ends of the X-direction adjustment handle 21 and the Y-direction adjustment handle 22 are exposed from the load surface of the workbench 1, and the X-direction adjustment handle 21 and the Y-direction adjustment handle 22 are used for adjusting the spatial posture of a work component clamped on the fine adjustment device 2.

[0025] As shown in Figure 1As shown, the fine adjustment device 2 can clamp the inspected right-angle ruler 6, the center line of the light outlet hole 41 is opposite to the contact line of the standard cylinder 3 and the inspected right-angle ruler 6, and the central light ray of the light beam emitted by the light outlet hole 41 can be perpendicular to the plane where the contact line of the standard cylinder 3 and the inspected right-angle ruler 6 is located.

[0026] As shown in the figure, Figure 2 As shown, the standard light gap generating assembly 5 is slidably connected to the inner guide rail 43 of the light box 4, the standard light gap generating assembly 5 includes two first gauge blocks 51 which are fixedly arranged in parallel, at least one second gauge block 52 is arranged between the two first gauge blocks 51, and a knife-edge ruler 53 is arranged on the upper surfaces of the first gauge blocks 51 and the second gauge block 52.

[0027] The height difference between the first gauge block 51 and the second gauge block 52 is 0.001-0.009mm.

[0028] The second gauge block 52 is a plurality of blocks, and the size of the second gauge block 52 continuously changes in a stepped manner from one end to the other end.

[0029] The sizes of the plurality of second gauge blocks 52 are 0.991mm, 0.992mm, 0.993mm, 0.994mm, 0.995mm, 0.996mm, 0.997mm, 0.998mm and 0.999mm respectively. The length of the knife-edge ruler 53 is 30mm, and the straightness of the knife-edge ruler 53 is not more than 0.3μm.

[0030] The light source 41 is a uniform LED plane light source.

[0031] The material of the workbench 1 is granite, cast iron or artificial marble.

[0032] The right-angle ruler perpendicularity calibration method, as shown in the figure, comprises the following steps: Figure 4 Step 1: configuring the standard light gap generating assembly 5 on the guide rail 43 and constructing a standard light gap; Step 2: placing the standard cylinder 3 on the workbench 1, clamping and fine-tuning the inspected right-angle ruler 6, and making the working surface of the inspected right-angle ruler 6 closely adhere to the standard cylinder 3; Step 3: placing the light box 4 closely behind the standard cylinder 3, and making the light outlet hole 41 opposite to the contact line of the standard cylinder 3 and the inspected right-angle ruler 6; Step 4: turning on the light source 42 and moving the guide rail 43, so that the standard light gap is sequentially emitted from the light outlet hole 41; Step 5: when the stable light transmission is observed for the first time, the size value of the current standard light gap is recorded, which is recorded as the perpendicularity deviation.

[0033] ​The construction of the standard light gap reference comprises the following steps: Step 101, in the standard light gap generating assembly 5, at least one second gauge block 52 is placed between two parallel first gauge blocks 51 as a reference; Step 102, the knife edge ruler 53 is arranged on the upper surfaces of the first gauge block 51 and the second gauge block 52, the top end of the second gauge block 52 is lower than the top end of the first gauge block 51, and a standard light gap with a known height is formed between the second gauge block 52 and the first gauge block 51; Step 103, the plurality of second gauge blocks 52 are continuously stepped from one end to the other end, so that the standard light gap generating assembly 5 can generate a continuously increasing standard light gap when moving along the guide rail 43.

[0034] Further comprising: after reading the perpendicularity deviation value, changing the contact position of the detected right angle ruler 6 on the standard cylinder 3, repeating steps 2-5 for multiple measurements to obtain the perpendicularity deviation distribution of the working surface of the detected right angle ruler 6.

[0035] The working principle of the right angle ruler perpendicularity calibration device is as follows: The core principle of the device is to use a known and accurately quantifiable standard light gap to measure the unknown gap between the working surface of the detected right angle ruler and the reference cylinder generatrix through direct optical comparison, thereby realizing rapid and objective detection of perpendicularity. The specific working process comprises the following three steps: First step: generating a standard reference In the light box 4, the standard light gap generating assembly 5 uses a set of precision gauge blocks to construct a measurement scale, two first gauge blocks 51 with the same height are fixed in parallel at both ends of the guide rail 43 to form a reference plane, and between the two first gauge blocks 51, the second gauge blocks 52 are arranged in order from low to high, such as 0.991mm to 0.999mm, the high-precision knife edge ruler 53 above the first gauge block 51 and the second gauge block 52 presses all the gauge blocks. The second gauge block 52 is lower than the first gauge block 51, so that a series of height-accurately known stepped gaps, i.e., standard light gaps, are formed between each second gauge block 52 and the upper edges of the first gauge blocks 51 on both sides. The uniform light emitted by the light source 42 in the light box 4, such as an LED, forms a standard light with a certain size information after passing through the specific gap aligned with the light hole 41.

[0036] Second step: constructing the measured gap When measuring, the tested right-angle ruler 6 is clamped on the fine adjustment device 2 in the middle of the workbench 1, the X-direction adjusting handle 21 and the Y-direction adjusting handle 22 are operated to finely adjust the spatial posture of the tested right-angle ruler 6, so that the long-side working surface of the tested right-angle ruler 6 to be measured is in close contact with the standard cylinder 3 fixed on the bearing surface of the workbench 1. The light box 4 is placed close to the rear of the standard cylinder 3, and the light outlet hole 41 of the light box 4 is ensured to be opposite to the contact line of the standard cylinder 3 and the tested right-angle ruler 6.

[0037] Step 3: Light gap comparison and interpretation The observer observes from the light outlet hole 41 of the light box 4 along the contact line from bottom to top. At this time, two situations may occur: if the tested right-angle ruler 6 is absolutely vertical, the working surface of the tested right-angle ruler 6 is completely attached to the generatrix of the standard cylinder 3 without a gap, and the standard light from the rear cannot pass through, so the observation field is dark; if the tested right-angle ruler 6 has a verticality deviation, a small wedge-shaped gap will be generated between the working surface of the tested right-angle ruler 6 and the generatrix of the cylinder 3.

[0038] By manually moving the guide rail 43 in the light box 4, the different sizes of the standard light gap in the standard light gap generating assembly 5 are aligned with the light outlet hole 41 in turn, and the observer continuously observes the contact line. When the standard light gap value used is smaller than the actual gap, the light cannot effectively pass through, and the observation field remains dark. When the guide rail 43 is moved to increase the standard light gap value to be equal to or slightly larger than the actual gap, the light can pass through the gap, and the observer will see that the contact line position suddenly appears to be transparent.

[0039] At this time, the known size difference value corresponding to the current standard light gap generating assembly, for example, 1.000mm-0.995mm=0.005mm, is the verticality deviation value of the tested right-angle ruler in this measurement state. By repeating this comparison process at different height positions, a more comprehensive verticality deviation evaluation can be obtained.

[0040] Example 1 The right-angle ruler verticality calibration device, as shown in the figure, comprises a workbench 1, a fine adjustment device 2 movably installed on the workbench 1, a standard cylinder 3 placed on one side of the fine adjustment device 2, and a light box 4 closely adjacent and placed on the back side of the standard cylinder 3. Figure 1 As shown in the figure, the light box 4 is provided with a light outlet hole 41 close to the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43. Figure 2

[0041] Example 2 The right-angle ruler verticality calibration device, as shown in the figure, comprises a workbench 1, a fine adjustment device 2 movably installed on the workbench 1, a standard cylinder 3 placed on one side of the fine adjustment device 2, and a light box 4 closely adjacent and placed on the back side of the standard cylinder 3. Figure 1 As shown in the figure, the light box 4 is provided with a light outlet hole 41 close to the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43. Figure 2 ​As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43.

[0042] As shown in the figure, the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove. Figure 3 As shown in the figure, the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove.

[0043] Embodiment 3 As shown in the figure, the right-angle ruler perpendicularity calibration device comprises a workbench 1, a fine adjustment device 2 movably installed on the workbench 1, and a standard cylinder 3 placed on one side of the fine adjustment device 2. Figure 1 As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43. Figure 2 As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43.

[0044] As shown in the figure, the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove. Figure 3 As shown in the figure, the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove.

[0045] As shown in the figure, the fine adjustment device 2 can clamp the detected right-angle ruler 6, the center line of the light outlet hole 41 is opposite to the contact line of the standard cylinder 3 and the detected right-angle ruler 6, and the central light beam of the light beam emitted by the light outlet hole 41 can be perpendicularly incident to the plane where the contact line of the standard cylinder 3 and the detected right-angle ruler 6 is located. Figure 1 Embodiment 4

[0046] As shown in the figure, the right-angle ruler perpendicularity calibration device comprises a workbench 1, a fine adjustment device 2 movably installed on the workbench 1, and a standard cylinder 3 placed on one side of the fine adjustment device 2. As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43. Figure 1 As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43. Figure 2 As shown in the figure, the light box 4 is provided with a light outlet hole 41 near one side of the standard cylinder 3, and the inside of the light box 4 is further provided with a light source 42 and a movable guide rail 43.

[0047] like Figure 3 As shown, a rectangular mounting slot is provided on the worktable 1, and the fine-tuning device 2 is fixedly installed in the rectangular mounting slot. The fine-tuning device 2 includes an X-axis adjustment handle 21 and a Y-axis adjustment handle 22. The X-axis adjustment handle 21 and the Y-axis adjustment handle 22 are arranged vertically in the same horizontal plane parallel to the bearing surface of the worktable 1. The operating ends of the X-axis adjustment handle 21 and the Y-axis adjustment handle 22 are exposed on the bearing surface of the worktable 1. The X-axis adjustment handle 21 and the Y-axis adjustment handle 22 are used to adjust the spatial posture of the working parts clamped on the fine-tuning device 2.

[0048] like Figure 1 As shown, the fine-tuning device 2 can clamp the right-angle ruler 6 to be inspected. The center line of the light output hole 41 is aligned with the contact line between the standard cylinder 3 and the right-angle ruler 6 to be inspected. The center light of the light beam emitted from the light output hole 41 can be perpendicularly incident on the plane where the contact line between the standard cylinder 3 and the right-angle ruler 6 to be inspected is located.

[0049] like Figure 2 As shown, a standard light gap generating component 5 is slidably connected to the guide rail 43 inside the light box 4. The standard light gap generating component 5 includes two parallel fixed first gauge blocks 51. At least one second gauge block 52 is disposed between the two first gauge blocks 51. A knife-edge ruler 53 is provided across the upper surfaces of the first gauge blocks 51 and the second gauge block 52. The height of the second gauge block 52 is less than the height of the first gauge block 51, which is used to form a gap between the first gauge blocks 51 for light to pass through.

[0050] The height difference between the first gauge block 51 and the second gauge block 52 ranges from 0.001 to 0.009 mm.

[0051] The second gauge block 52 consists of multiple blocks, and the size of the second gauge block 52 changes in a continuous stepped manner from one end to the other.

[0052] The dimensions of the multiple second gauge blocks 52 are 0.991mm, 0.992mm, 0.993mm, 0.994mm, 0.995mm, 0.996mm, 0.997mm, 0.998mm and 0.999mm respectively; Example 5 Right-angle ruler perpendicularity calibration device, such as Figure 1 As shown, the device includes a workbench 1, on which a fine-tuning device 2 is movably mounted. A standard cylinder 3 is placed on one side of the fine-tuning device 2, and a light box 4 is placed adjacent to and placed on the back side of the standard cylinder 3. Figure 2 As shown, the light box 4 has a light outlet 41 on the side near the standard cylinder 3, and the interior of the light box 4 also has a light source 42 and a movable guide rail 43.

[0053] like Figure 3As shown, the workbench 1 is provided with a rectangular mounting groove, and the fine adjustment device 2 is fixedly installed in the rectangular mounting groove, the fine adjustment device 2 comprises an X-direction adjusting handle 21 and a Y-direction adjusting handle 22, the X-direction adjusting handle 21 and the Y-direction adjusting handle 22 are arranged in the same horizontal plane which is parallel to the bearing surface of the workbench 1, the operating ends of the X-direction adjusting handle 21 and the Y-direction adjusting handle 22 are exposed from the bearing surface of the workbench 1, and the X-direction adjusting handle 21 and the Y-direction adjusting handle 22 are used for adjusting the spatial posture of a work component clamped on the fine adjustment device 2.

[0054] As shown in the figure, Figure 1 As shown, the fine adjustment device 2 can clamp the detected right-angle ruler 6, the center line of the light-emitting hole 41 is opposite to the contact line of the standard cylinder 3 and the detected right-angle ruler 6, and the central light beam of the light beam emitted by the light-emitting hole 41 can be perpendicularly incident to the plane where the contact line of the standard cylinder 3 and the detected right-angle ruler 6 is located.

[0055] As shown in the figure, Figure 2 As shown, the standard light gap generating assembly 5 is slidably connected to the inner guide rail 43 of the light box 4, the standard light gap generating assembly 5 comprises two first gauge blocks 51 which are fixedly arranged in parallel, at least one second gauge block 52 is arranged between the two first gauge blocks 51, and a knife-edge ruler 53 is arranged on the upper surfaces of the first gauge blocks 51 and the second gauge block 52.

[0056] The height difference between the first gauge block 51 and the second gauge block 52 is 0.001-0.009 mm.

[0057] The second gauge block 52 is a plurality of blocks, and the sizes of the second gauge blocks 52 continuously change in a stepped manner from one end to the other end.

[0058] The sizes of the plurality of second gauge blocks 52 are 0.991 mm, 0.992 mm, 0.993 mm, 0.994 mm, 0.995 mm, 0.996 mm, 0.997 mm, 0.998 mm and 0.999 mm, respectively. The length of the knife-edge ruler 53 is 30 mm, and the straightness of the knife-edge ruler 53 is not more than 0.3 μm.

[0059] The right-angle ruler perpendicularity calibration device converts the angle deviation perpendicularity which is difficult to directly measure into a gap width which can be accurately compared, and directly compares and reads through a set of mechanical and traceable standard light gap rulers, so that rapid, objective and high-precision on-site detection is realized. The right-angle ruler perpendicularity calibration device provided by the application can be disassembled when calibrated on site, has a small volume and is convenient to carry.

[0060] Example 6 Based on the right-angle ruler perpendicularity calibration device provided in Embodiments 1-5, this embodiment provides a right-angle ruler perpendicularity calibration method, as shown in the accompanying drawings, comprising the following steps: Figure 4 Step 1, configure the standard light gap generating assembly 5 on the guide rail 43 and build the standard light gap; Step 2, place the standard cylinder 3 on the workbench 1, clamp and fine-tune the detected right-angle ruler 6, and make the working surface of the detected right-angle ruler 6 tightly adhere to the standard cylinder 3; Step 3, place the light box 4 closely behind the standard cylinder 3, and make the light outlet hole 41 directly face the contact line between the standard cylinder 3 and the detected right-angle ruler 6; Step 4, turn on the light source 42 and move the guide rail 43, so that the standard light gap is sequentially emitted from the light outlet hole 41; Step 5, when the stable light transmission is observed for the first time, record the size value of the current standard light gap, which is recorded as the perpendicularity deviation.

[0061] The construction of the standard light gap reference comprises the following steps: Step 101, in the standard light gap generating assembly 5, take two parallel first gauge blocks 51 as the reference, and place at least one second gauge block 52 between the two first gauge blocks 51; Step 102, cross the knife-edge ruler 53 on the upper surfaces of the first gauge block 51 and the second gauge block 52, and the top end of the second gauge block 52 is lower than the top end of the first gauge block 51, so as to form a standard light gap with a known height between the second gauge block 52 and the first gauge block 51; Step 103, the multiple second gauge blocks 52 are continuously stepped from one end to the other end, so that the standard light gap generating assembly 5 can generate a continuously increasing standard light gap when moving along the guide rail 43.

[0062] Further comprising: after reading the perpendicularity deviation value, change the contact position of the detected right-angle ruler 6 on the standard cylinder 3, repeat steps 2-5 for multiple measurements to obtain the perpendicularity deviation distribution of the working surface of the detected right-angle ruler 6.​

Claims

1. A right-angle square perpendicularity calibration device, characterized by, The utility model provides a kind of standard cylinder detection device, including workbench (1), the fine adjustment device (2) is movably installed on the workbench (1), the standard cylinder (3) is placed on one side of the fine adjustment device (2), the back side of the standard cylinder (3) is closely adjacent and placed with light box (4), the light box (4) is equipped with light hole (41) near standard cylinder (3) one side, the inside of the light box (4) is also equipped with light source (42) and movable guide rail (43).

2. The square perpendicularity calibration device of claim 1, wherein, The workbench (1) is provided with a rectangular mounting groove, and the fine adjustment device (2) is fixedly installed in the rectangular mounting groove. The fine adjustment device (2) includes an X-direction adjusting handle (21) and a Y-direction adjusting handle (22). The X-direction adjusting handle (21) and the Y-direction adjusting handle (22) are arranged in the same horizontal plane perpendicular to the workbench (1). The operating ends of the X-direction adjusting handle (21) and the Y-direction adjusting handle (22) are exposed on the bearing surface of the workbench (1). The X-direction adjusting handle (21) and the Y-direction adjusting handle (22) are used for adjusting the spatial posture of a workpiece clamped on the fine adjustment device (2).

3. The square perpendicularity calibration device of claim 1, wherein, The fine adjustment device (2) can clamp a detected square ruler (6). The center line of the light hole (41) is opposite to the contact line between the standard cylinder (3) and the detected square ruler (6). The central light beam of the light beam emitted by the light hole (41) can be perpendicularly incident on the plane where the contact line between the standard cylinder (3) and the detected square ruler (6) is located.

4. The square perpendicularity calibration device of claim 1, wherein, The light box (4) is slidably connected with a standard light gap generating assembly (5) on the guide rail (43) in the light box (4). The standard light gap generating assembly (5) includes two first gauge blocks (51) fixedly arranged in parallel. At least one second gauge block (52) is arranged between the two first gauge blocks (51). A knife-edge ruler (53) is arranged on the upper surfaces of the first gauge blocks (51) and the second gauge block (52). The height of the second gauge block (52) is less than the height of the first gauge block (51), so as to form a gap for light to pass through between the first gauge blocks (51).

5. The square perpendicularity calibration device of claim 4, wherein, The height difference between the first gauge block (51) and the second gauge block (52) is 0.001-0.009 mm.

6. The square perpendicularity calibration device of claim 4, wherein, The second gauge block (52) is a plurality of gauge blocks. The sizes of the second gauge blocks (52) change in a stepwise manner from one end to the other end.

7. A square perpendicularity calibration device according to claim 5 or 6, c h a r a c t e r i z e d in that The sizes of the second gauge blocks (52) are 0.991 mm, 0.992 mm, 0.993 mm, 0.994 mm, 0.995 mm, 0.996 mm, 0.997 mm, 0.998 mm and 0.999 mm, respectively. The length of the knife-edge ruler (53) is 30 mm, and the straightness of the knife-edge ruler (53) is not more than 0.3 μm.

8. A method for the calibration of the perpendicularity of a right-angle square, using the device according to any one of claims 1 to 7, characterized in that, The method includes the following steps: Step 1: configuring the standard light gap generating assembly (5) on the guide rail (43) and constructing a standard light gap. Step 2: placing the standard cylinder (3) on the workbench (1), clamping and fine-tuning the detected square ruler (6), and making the working surface of the detected square ruler (6) closely adhere to the standard cylinder (3). Step 3, place the light box (4) closely behind the standard cylinder (3) so that the light hole (41) is directly opposite the contact line of the standard cylinder (3) and the measured square ruler (6); Step 4, turn on the light source (42) and move the guide rail (43) so that the standard light gap is emitted from the light hole (41) in turn; Step 5, when the stable light transmission is first observed, record the current standard light gap size value, which is recorded as the perpendicularity deviation.

9. The square perpendicularity calibration method of claim 8, wherein, The construction of the standard light gap reference includes the following steps: Step 101, in the standard light gap generating assembly (5), take two parallel first measuring blocks (51) as the reference, and place at least one second measuring block (52) between the two first measuring blocks (51); Step 102, cross the knife edge ruler (53) on the upper surface of the first measuring block (51) and the second measuring block (52), the top end height of the second measuring block (52) is lower than that of the first measuring block (51), and a standard light gap with a known height is formed between the second measuring block (52) and the first measuring block (51); Step 103, a plurality of second measuring blocks (52) are arranged in a continuous stepped manner from one end to the other end, so that when the standard light gap generating assembly (5) moves along the guide rail (43), a continuously increasing standard light gap can be generated.

10. The perpendicularity calibration method of a right-angle scale according to claim 8 or 9, characterized by, Also includes: After reading the perpendicularity deviation value, change the contact position of the measured square ruler (6) on the standard cylinder (3), repeat steps 2-5 for multiple measurements to obtain the perpendicularity deviation distribution of the working surface of the measured square ruler (6).

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