A curved arm rectangular tube shaft hole detection device

Abstract

This invention provides a device for detecting the shaft holes of curved rectangular tubes, including a frame platform and multiple sets of positioning plates mounted on the frame platform. Each set of positioning plates is integrally welded together on both sides by trapezoidal ribs and is arranged vertically and oppositely. The positioning plates are provided with test shaft holes. The size of the positioning plates and the number and position of the test shaft holes vary between different sets, specifically divided into three groups. The first group of positioning plates has five test shaft holes arranged in a wavy line; the second group of positioning plates has two inclined test shaft holes; and the third group of positioning plates has one test shaft hole. Space is left between each set of positioning plates for placing the curved rectangular tube. A test rod is inserted through the test shaft hole on one side of the positioning plate, passes through the shaft hole of the curved rectangular tube, and reaches the test shaft hole on the other side of the positioning plate for testing. This detection device achieves multi-point testing of the shaft holes of curved rectangular tubes with a single clamping through the grouped positioning plate design and the test rod insertion testing method.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts testing technology, and in particular to a device for testing the shaft hole of a curved rectangular tube. Background Technology

[0002] As a crucial structural component in engineering machinery, construction equipment, and various mechanical devices, the machining accuracy of the shaft holes in curved boom rectangular tubes directly affects the assembly quality, operational stability, and service life of the entire machine. Curved boom rectangular tubes typically have complex geometries with multiple shaft holes at different positions and angles, used for connecting with shaft components of other parts. Due to the unique structural characteristics of curved boom rectangular tubes, the positional accuracy, coaxiality, and inter-axis positional relationships of their shaft holes require extremely stringent standards. Any minute deviation can lead to assembly difficulties, motion interference, or excessive wear.

[0003] In existing processes for inspecting the shaft holes of curved rectangular tubes, traditional measurement methods are typically employed. These methods include using vernier calipers and micrometers to measure the dimensions of each shaft hole individually, or using a coordinate measuring machine to inspect the position of the shaft holes point by point. These traditional methods suffer from the following technical problems: low inspection efficiency, requiring individual measurement of each shaft hole, which is time-consuming; significant impact on inspection accuracy due to human factors, with the operator's skill level and experience directly affecting the accuracy and consistency of the results; difficulty in accurately assessing the relative positional relationship and coaxiality between shaft holes, especially for curved rectangular tubes with complex shapes and irregular shaft hole distribution; frequent adjustments to the workpiece position and measuring equipment during inspection, increasing operational complexity and potential measurement errors; and difficulty in achieving intuitive and rapid verification of shaft hole permeability and assembly adaptability, failing to effectively simulate the fit conditions during actual assembly.

[0004] Therefore, how to improve the efficiency and accuracy of the inspection of the shaft hole of the curved arm rectangular tube, simplify the inspection process, reduce human error, and be able to intuitively and accurately evaluate the positional accuracy and assembly adaptability of the shaft hole are technical problems that urgently need to be solved in the field of mechanical parts quality inspection. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the technical problems of low detection efficiency, unstable accuracy, complex operation, and difficulty in intuitively assessing the adaptability of shaft hole assembly in the prior art, and to provide a shaft hole detection device for curved arm rectangular tubes that can quickly and accurately detect the position accuracy and permeability of shaft holes.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A device for detecting the shaft hole of a curved rectangular tube, comprising: Rack platform; Multiple positioning plates are set on the frame platform. Each positioning plate is integrally welded on both sides by trapezoidal stiffeners and is set vertically and oppositely on the frame platform. The test shaft holes are set on the positioning plate. The positioning plates of different groups are different in size, and the number and position of the test shaft holes on the positioning plate are also different. Space is left between each set of positioning plates for placing curved rectangular tubes; The test bar is used to insert from the test shaft hole on one side of the positioning plate to the positioning plate on the other side, passing through the test shaft holes on any two positioning plates and the shaft hole on the curved arm rectangular tube.

[0007] Prioritized, the multiple positioning plates include three sets: The first set of positioning plates each has five test shaft holes in different positions, for a total of ten; The second set of positioning plates each has two test shaft holes in different positions, for a total of four; Each of the third set of positioning plates has one test shaft hole, for a total of two.

[0008] Prior to this, the five test shaft holes on the first set of positioning plates are arranged in a wavy line.

[0009] Prioritize that the two test shaft holes on the second set of positioning plates are tilted.

[0010] Preferred, the trapezoidal stiffener has a trapezoidal cross-section structure with a wider bottom edge and a narrower top edge, and is set on the left and right edges of the positioning plate.

[0011] Preferredly, it also includes pads, which are set at the front and rear ends of the testing machine to hold the curved rectangular tube.

[0012] Preferably, the test bar is a cylindrical structure, long enough to pass through the entire space between the two positioning plates.

[0013] The beneficial effects that this utility model can achieve are: By setting multiple sets of positioning plates on the frame platform, each set of positioning plates is integrally welded together with trapezoidal ribs on both sides and set vertically and oppositely. Different numbers and positions of test shaft holes are set on the positioning plates. With the help of test bars, the test bars are inserted from the test shaft holes of one positioning plate, pass through the shaft holes of the curved arm rectangular tube, and reach the test shaft holes of the other positioning plate. This forms a rapid detection system for multi-point detection in one clamping. It realizes the simultaneous detection of the positional accuracy, coaxiality, and transparency of the shaft holes of the curved arm rectangular tube, effectively solves the problems of low detection efficiency and complex operation, and significantly improves detection efficiency and operation convenience.

[0014] By setting up three sets of positioning plates of different specifications, the first set of positioning plates has five test shaft holes arranged in a wavy line, the second set of positioning plates has two inclined test shaft holes, and the third set of positioning plates has one straight test shaft hole, forming a classification and detection system that adapts to the characteristics of different types of shaft holes. This enables targeted detection of irregularly distributed, tilted, and straight shaft holes on curved rectangular tubes, effectively solving the problems of difficulty in adapting to complex shaft hole distributions and inability to intuitively verify assembly adaptability, and greatly improving the targeting and accuracy of the detection.

[0015] Through the rigid connection structure of trapezoidal stiffeners and the stable support of the frame platform, combined with the intuitive detection method of test bar insertion, a standardized detection operating system has been formed. This has achieved standardization of the detection process and consistency of detection results, effectively solving the problems of large human error and unstable detection results. It has also significantly reduced the skill requirements for operators and improved the reliability and reproducibility of detection results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the curved arm rectangular tube shaft hole detection device in Example 1.

[0017] Reference numerals in the attached drawings: 1. Frame platform; 2. First set of positioning plates; 3. Second set of positioning plates; 4. Third set of positioning plates; 5. Test shaft hole; 6. Test bar; 7. Pad; 8. Curved arm rectangular tube; 9. Shaft hole; 10. Trapezoidal rib plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0019] See appendix Figure 1 A device for detecting the shaft hole of a curved rectangular tube 8 includes a frame platform 1, multiple sets of positioning plates, test shaft holes 5, test bars 6, and pads 7. This device is mainly used to detect the positional accuracy, coaxiality, and permeability of the shaft hole 9 on the curved rectangular tube 8, and can quickly and accurately evaluate the machining quality and assembly suitability of the shaft hole 9.

[0020] The frame platform 1, serving as the basic support structure of the entire testing device, is rectangular in shape and can stably support the weight of the curved arm rectangular tube 8 and each set of positioning plates. The surface of the frame platform 1 is flat, its length is parallel to the axis of the curved arm rectangular tube 8, and its width is sufficient to accommodate the lateral arrangement of the three sets of positioning plates.

[0021] Multiple sets of positioning plates are vertically and relatively arranged on the frame platform 1. Each set of positioning plates is a rectangular plate structure, divided into three groups according to the different characteristics of the shaft holes 5 of the curved arm rectangular tube. The size, number of test shaft holes 5, and position of each set of positioning plates are different. The first set of positioning plates 2 is the largest rectangular plate, used to detect multiple shaft holes 9 with complex distribution on the curved arm rectangular tube 8; the second set of positioning plates 3 is a medium-sized rectangular plate, used to detect shaft holes 9 with a certain tilt angle; the third set of positioning plates 4 is the smallest rectangular plate, used to detect straight shaft holes 9. Each set of positioning plates is set in pairs on the frame platform 1, with the two positioning plates arranged relatively parallel and facing each other, leaving space in the middle for placing the curved arm rectangular tube 8. This grouping design allows the testing device to adapt to different types and specifications of curved arm rectangular tubes 8.

[0022] Each positioning plate is integrally welded to two trapezoidal stiffeners 10 on both sides. The trapezoidal stiffeners 10 have a trapezoidal cross-section, with a wider base and a narrower top, and are positioned along the left and right edges of the positioning plate. The trapezoidal stiffeners 10 are firmly connected to the positioning plate using welding, forming a stable support structure. This enhances the rigidity and stability of the positioning plate, providing sufficient structural strength and ensuring that the positioning plate does not deform or shift during testing, thus guaranteeing the accuracy and stability of the test shaft hole 5 position. Furthermore, the bottom of the trapezoidal stiffeners 10 is fixedly connected to the frame platform 1, forming a robust overall structure.

[0023] The test shaft holes 5 are circular holes, and are set according to different groups of positioning plates. The first group of positioning plates 2 has five test shaft holes 5 arranged in a wavy line, forming an undulating curve distribution on the positioning plate, totaling ten (five on each side of the positioning plate), which can simulate the irregularly distributed positional relationship of the shaft holes 9 on the curved arm rectangular tube 8. The second group of positioning plates 3 has two inclined test shaft holes 5, totaling four (two on each side of the positioning plate), specifically used to detect shaft holes 9 with a certain tilt angle on the curved arm rectangular tube 8. The third group of positioning plates 4 has one test shaft hole 5, with the axis of the shaft hole 9 perpendicular to the plane of the positioning plate, totaling two (one on each side of the positioning plate), used to detect straight shaft holes 9 on the curved arm rectangular tube 8.

[0024] The test rod 6 is a cylindrical structure, long enough to pass through the entire space between the two positioning plates. The test rod 6 is inserted through the test shaft hole 5 on one positioning plate, passes through the shaft hole 9 on the curved arm rectangular tube 8, and finally reaches the test shaft hole 5 on the other positioning plate. It is used to verify the permeability and positional accuracy of the shaft hole 9. The diameter of the test rod 6 matches the standard shaft diameter, and its smooth surface accurately reflects the fit accuracy and permeability of the shaft hole 9. During the testing process, two test rods 6 can be randomly selected and passed through the test shaft holes 5 on any two positioning plates and the corresponding shaft holes 9 on the curved arm rectangular tube 8 for simultaneous multi-point testing.

[0025] The pads 7 are rectangular plates, positioned at the front and rear ends of the testing machine, perpendicular to the frame platform 1, providing stable support for the curved arm rectangular tube 8. The surface of the pads 7 is designed with an anti-slip texture, exhibiting an uneven pattern to ensure the curved arm rectangular tube 8 maintains a stable position during testing, preventing workpiece movement from affecting testing accuracy. The pads 7 are connected to the frame platform 1 by bolts or welding, forming a robust support structure. Appropriate rectangular spaces are left between each set of positioning plates for placing the curved arm rectangular tube 8; the width of these rectangular spaces is slightly larger than the maximum cross-sectional dimension of the curved arm rectangular tube 8.

[0026] The positioning plates are interconnected via the frame platform 1 to form a complete testing system. The first group of positioning plates 2, the second group of positioning plates 3, and the third group of positioning plates 4 are arranged in a straight line on the frame platform 1, maintaining a certain distance between them to avoid mutual interference during the testing process. The entire device has a compact and reasonable structure, and the connection relationships between the components are clear and well-defined to ensure the smooth progress of the testing process.

[0027] The working principle and method of the above-mentioned curved arm rectangular tube shaft hole detection device are as follows: The first step involves the operator placing the curved arm rectangular tube 8 to be tested within the rectangular space between the corresponding group of positioning plates. A suitable positioning plate group is selected based on the size of the curved arm rectangular tube 8 and the distribution of its shaft holes 9. The curved arm rectangular tube 8 is then stably placed on the pad 7, using the anti-slip texture on the surface of the pad 7 to fix the workpiece position, ensuring the workpiece is horizontal, and roughly aligning the shaft holes 9 on the curved arm rectangular tube 8 with the test shaft holes 5 on the positioning plate to establish an accurate testing benchmark.

[0028] The second step involves the operator selecting the appropriate cylindrical test bar 6 for testing according to the testing requirements. For the first set of positioning plates 2, two test bars 6 can be randomly selected and inserted into the test shaft holes 5 arranged in different wavy lines to verify the positional accuracy of the shaft holes 9 distributed in a wavy line on the curved rectangular tube 8. For the second set of positioning plates 3, the test bar 6 is inserted into the inclined test shaft holes 5 to check whether the inclined shaft holes 9 meet the design requirements. For the third set of positioning plates 4, the test bar 6 is inserted into the vertical test shaft holes 5 to check the permeability and coaxiality of the straight shaft holes 9.

[0029] The third step involves the operator inserting the cylindrical test rod 6 into the test shaft hole 5 on one side of the positioning plate. The test rod 6 first passes through the circular test shaft hole 5 on the positioning plate, then through the central rectangular space, next through the corresponding circular shaft hole 9 on the curved arm rectangular tube 8, and finally reaches the corresponding test shaft hole 5 on the other side of the positioning plate. If the shaft hole 9 of the curved arm rectangular tube 8 is accurately positioned and properly machined, the test rod 6 should be able to smoothly pass through the entire path and be fully inserted into the test shaft hole 5 on the other side of the positioning plate. During insertion, the operator can feel the resistance of the test rod 6 by hand to judge the fitting accuracy and surface quality of the shaft hole 9.

[0030] The fourth step is to determine the quality based on the insertion result of the test rod 6. If the test rod 6 can smoothly pass through the entire inspection path, completely penetrating from the test shaft hole 5 on one side of the positioning plate to the test shaft hole 5 on the other side of the positioning plate, it indicates that the positional accuracy, coaxiality, and processing quality of the shaft hole 9 of the curved arm rectangular tube 8 meet the requirements, and the inspection is qualified. If the test rod 6 cannot pass through smoothly at any point, or if there is abnormal resistance during insertion, it indicates that there are problems such as positional deviation, dimensional non-compliance, or processing defects in the corresponding shaft hole 9. The curved arm rectangular tube 8 is determined to be a non-conforming product to ensure product quality.

[0031] Fifth, for the curved arm rectangular tube 8 that requires multi-point testing, the operator can change different combinations of test bars 6 and use the multiple test shaft holes 5 arranged in a wavy pattern on the first set of positioning plates 2, or adjust the position of the curved arm rectangular tube 8, to test other shaft holes 9, in order to ensure that all critical shaft holes 9 pass the inspection. At the same time, different sets of positioning plates can be used to perform comprehensive testing on different parts of the curved arm rectangular tube 8.

[0032] Throughout the testing process, the use of grouped positioning plates and a standardized layout of test shaft holes 5, with each group of positioning plates forming a stable overall structure with the frame platform 1 via trapezoidal ribs 10, ensures a high degree of standardization, ease of operation, and intuitive and reliable test results. The method of inserting cylindrical test bars 6 not only verifies the machining accuracy of individual shaft holes 9 but also examines the relative positional relationships and assembly adaptability between shaft holes 9—something difficult to achieve with traditional measurement methods—providing a more comprehensive and accurate quality assessment.

[0033] After the inspection is completed, the operator removes the test bar 6, safely removes the curved rectangular tube 8 using the support of the pad 7, records the inspection results, and prepares for the inspection of the next workpiece. The entire inspection process is fast and efficient, greatly improving the efficiency and accuracy of quality control.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any innovative improvements or substitutions based on the present invention should fall within the scope of the claims of the present invention. Furthermore, the parameters, materials, and processes mentioned in the above embodiments are not unique. Without departing from the technical essence of the present invention, those skilled in the art can make various alternative choices, and these alternative solutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A device for detecting the shaft hole of a curved rectangular tube, characterized in that, include: Rack platform; Multiple positioning plates are set on the frame platform. Each positioning plate is integrally welded on both sides by trapezoidal stiffeners and is set vertically and oppositely on the frame platform. The test shaft holes are set on the positioning plate. The positioning plates of different groups are different in size, and the number and position of the test shaft holes on the positioning plate are also different. Space is left between each set of positioning plates for placing curved rectangular tubes; The test bar is used to insert from the test shaft hole on one side of the positioning plate to the positioning plate on the other side, passing through the test shaft holes on any two positioning plates and the shaft hole on the curved arm rectangular tube.

2. The device for detecting the shaft hole of a curved rectangular tube according to claim 1, characterized in that, The multiple sets of positioning plates include three sets: The first set of positioning plates each has five test shaft holes in different positions, for a total of ten; The second set of positioning plates each has two test shaft holes in different positions, for a total of four; Each of the third set of positioning plates has one test shaft hole, for a total of two.

3. The device for detecting the shaft hole of a curved rectangular tube according to claim 2, characterized in that, The five test shaft holes on the first set of positioning plates are arranged in a wavy line.

4. The device for detecting the shaft hole of a curved rectangular tube according to claim 2, characterized in that, The two test shaft holes on the second set of positioning plates are set at an angle.

5. The device for detecting the shaft hole of a curved rectangular tube according to claim 1, characterized in that, The trapezoidal stiffener has a trapezoidal cross-section structure, with a wider bottom edge and a narrower top edge, and is set on the left and right edges of the positioning plate.

6. The device for detecting the shaft hole of a curved rectangular tube according to claim 1, characterized in that, It also includes pads, which are set at the front and rear ends of the testing machine to hold the curved rectangular tube.

7. The device for detecting the shaft hole of a curved rectangular tube according to claim 1, characterized in that, The test bar is a cylindrical structure, long enough to pass through the entire space between the two positioning plates.

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