Long spring detection device

Abstract

The utility model relates to detection technical field discloses a long spring detection device, including base, positioning post, for along the axial sleeveing position of long spring of waiting for measuring, positioning portion is used for positioning the lower end edge of long spring of waiting for measuring, reference groove is used for judging whether the upper end of long spring of waiting for measuring falls into the projection area of reference groove, to determine whether the free height and the circumferential direction angle deviation of the upper end of long spring of waiting for measuring are in the preset tolerance, the utility model avoids the spring to occur stretching, compression or shift when detecting, avoids the detection error caused by external force interference, through the setting of reference groove can be used for synchronous detection free height and the circumferential direction angle deviation of long spring's upper end, has simplified the detection procedure, reduced equipment cost, the whole structure of the device is simple, detects high -efficient accurate, adapts the long spring fast quality inspection demand under the batch production scene.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, and in particular to a long spring detection device. Background Technology

[0002] Existing spring testing methods employ manual visual inspection or laser scanning. However, for long springs, it's difficult to guarantee that the spring won't be stretched or compressed when manually measuring its free height, often resulting in inaccurate measurements. Laser scanning requires coordination with the axial movement of the long spring to complete full-length testing. But due to the length of the spring, slight vibrations or offsets can occur during movement due to insufficient guide rail precision or the spring's own weight, causing the laser scanning trajectory to deviate from the spring's axis. For long springs undergoing long-distance scanning, these minute offsets are amplified at the end, ultimately leading to height measurement errors far exceeding the error range of ordinary spring testing.

[0003] In addition, for springs with special requirements, it is necessary to measure the circumferential angular deviation at the starting or ending point, but there is no corresponding solution in the existing testing devices. Utility Model Content

[0004] The purpose of this invention is to provide a long spring detection device to solve the problems in the prior art. It can detect the free height of a long spring and the circumferential angular deviation of the starting or ending end. The device has a simple structure and is not prone to errors.

[0005] This utility model provides a long spring detection device, comprising: Base; A positioning post is erected vertically on the top of the base to position the spring to be measured along the axial direction. The positioning part is located on the upper surface of the base and fixed to one side of the positioning post, and is used to position the lower end edge of the spring to be measured. A reference groove is formed along the axial direction of the positioning post on the side of the positioning post away from the positioning part. It is used to determine whether the upper end of the long spring to be tested falls into the projected area of ​​the reference groove, so as to determine whether the free height of the long spring to be tested and the circumferential angular deviation of the upper end are within the preset tolerance.

[0006] In the long spring testing device described above, preferably, the upper end of the long spring to be tested has a top reference surface and an edge extending radially outward. When the top reference surface is within the axial height range of the reference groove, the free height of the long spring to be tested is within a preset tolerance. When the edge is within the horizontal width range of the reference groove, the circumferential angular deviation of the upper end of the long spring to be tested is within a preset tolerance.

[0007] In the long spring testing device described above, preferably, the contact surface between the positioning part and the long spring to be tested is coaxial with the central axis of the reference groove.

[0008] In the long spring detection device described above, preferably, the reference groove is a rectangular groove.

[0009] In the long spring testing device described above, preferably, the height tolerance of the long spring to be tested is L±a, the height from the center point of the reference groove to the base is h, h=L, and the distance from both sides of the reference groove along the axial direction to the center point of the reference groove is d1, d1=a.

[0010] In the long spring testing device described above, preferably, the circumferential angular deviation of the upper end of the long spring to be tested is ±α, and the distance from both sides of the reference groove along the width direction to the center point of the reference groove is d2. Where D is the mean diameter of the spring to be measured.

[0011] In the long spring detection device described above, preferably, the lower surface of the base is provided with an anti-slip pad.

[0012] Compared with the prior art, this utility model can quickly mount the long spring to be tested through the positioning post, and can quickly position its lower end edge through the positioning part, so as to avoid the spring being stretched, compressed or displaced during the test, and avoid the test error caused by external force interference. The reference groove can be used to simultaneously detect the free height of the long spring and the angular deviation of the upper end circumference. The operator can judge whether it meets the preset tolerance by visually observing whether the upper end of the long spring falls within the projected area of ​​the reference groove. There is no need to rely on complex equipment such as laser scanning, which simplifies the inspection process and reduces equipment costs. The device has a simple overall structure, high efficiency and accuracy in detection, and is suitable for the rapid quality inspection needs of long springs in mass production scenarios. Attached Figure Description

[0013] Figure 1 This is a perspective view of the long spring detection device provided in an embodiment of this utility model; Figure 2 yes Figure 1 Enlarged view of point A in the image.

[0014] Explanation of reference numerals in the attached figures: 10. Base; 11. Anti-slip mat; 20. Positioning post; 30. Positioning part; 31. Contact surface; 40. Reference groove; 50. The long spring to be measured; 51. The top reference surface; 52. The edge. Detailed Implementation

[0015] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0016] See Figure 1-2 As shown, this embodiment provides a long spring detection device, including a base 10, a positioning post 20, a positioning part 30, and a reference groove 40, wherein: The base 10 is used to support the long spring 50 to be tested. The positioning post 20 is erected vertically on the top of the base 10 for the long spring 50 to be tested to be axially mounted and positioned. The positioning part 30 is located on the upper surface of the base 10 and fixed on one side of the positioning post 20 for positioning the lower end edge of the long spring 50 to be tested. The reference groove 40 is opened along the axial direction of the positioning post 20 on the side of the positioning post 20 away from the positioning part 30 for determining whether the upper end of the long spring 50 to be tested falls into the projected area of ​​the reference groove 40, so as to determine whether the free height of the long spring 50 to be tested and the circumferential angular deviation of the upper end are within the preset tolerance. In the embodiments provided in this application, the long spring 50 to be tested is axially mounted on the positioning post 20, avoiding stretching or compression of the long spring 50 during manual measurement, effectively eliminating errors caused by human intervention. The positioning post 20 provides stable support, and its height is greater than that of the long spring 50 to be tested. The diameter of the positioning post 20 is equal to or slightly greater than the inner diameter of the long spring 50 to be tested, preventing the long spring from shifting during testing and affecting the test results. The positioning part 30 positions the lower end of the long spring 50 to be tested, ensuring measurement consistency and reducing vibration and shifting caused by the movement of the long spring or its own weight. The reference groove 40 is formed on the positioning post 20. After the spring 50 to be tested is installed on the positioning post 20, it is manually rotated so that the lower end of the spring 50 coincides with the contact surface 31 of the positioning part 30. The relevant test results can be determined by observing whether its upper end falls into the projected area of ​​the reference groove 40. This device does not require complex technical tools, which can reduce errors caused by equipment accuracy. Moreover, it has a simple structure and is easy to operate, effectively reducing labor costs and operational complexity. It should be noted that the two ends of the long spring along the axial direction are the same. The description of the upper end and the lower end in this embodiment is based on the relative definition of the assembly state and does not limit the actual orientation of the two ends of the long spring 50 under test.

[0017] See Figure 2As shown, in this embodiment, the upper end of the long spring has a top reference surface 51 and an edge portion 52 arranged in the horizontal direction. When the top reference surface 51 is within the axial height range of the reference groove 40, the free height of the long spring 50 under test is within the preset tolerance. When the edge portion 52 is within the horizontal width range of the reference groove 40, the circumferential angular deviation of the upper end of the long spring 50 under test is within the preset tolerance. The top reference surface 51 is the upper end face of the upper end of the long spring 50 under test along the axial direction. The reference groove 40 can simultaneously realize the integrated detection of the free height and circumferential angular deviation of the long spring. During the detection process, there is no need to switch the detection device or adjust the posture of the long spring 50 under test. After the set is positioned, by observing the positional relationship between the top reference surface 51 and the edge portion 52 of the long spring 50 under test and the reference groove 40, it is possible to simultaneously determine whether the free height and angular deviation are qualified, reducing the detection process, shortening the detection time, and adapting to batch detection scenarios. The detection method in this embodiment is simple. When detecting the free height, the two sides of the axial height of the reference groove 40 are used as the judgment standard. When detecting the circumferential angle deviation, the two sides of the horizontal width of the reference groove 40 are used as the judgment standard. This detection device does not require complicated readings or calculations, nor does it require professional measuring tools. It is intuitive and easy to understand, and can avoid judgment errors.

[0018] See Figure 1 As shown, in this embodiment, the contact surface 31 between the positioning part 30 and the long spring 50 to be measured is coaxial with the central axis of the reference groove 40. Taking the center point of the reference groove 40 as the reference, its extension line is used as the lower end positioning reference point, so that the detection reference of the long spring from bottom to top is unified, avoiding height and angle detection errors caused by reference offset, and improving measurement accuracy.

[0019] See Figure 1 As shown, in some embodiments of this application, the positioning part 30 adopts a positioning pin. The contact surface 31 between the positioning pin and the long spring 50 to be tested is a plane, which can increase the contact area with the long spring 50 to be tested, avoid positioning offset, and thus ensure the stable positioning posture of the lower end of the long spring. Moreover, the positioning pin has a simple structure, low manufacturing cost, wear resistance and durability, and is suitable for high-frequency assembly and testing operations.

[0020] See Figure 1-2 As shown, in this embodiment, the reference groove 40 is a rectangular groove. The rectangular groove has a clear boundary and only one center point. Therefore, the axial height and horizontal width of the reference groove 40 are distributed symmetrically around this point, avoiding the superposition of deviations caused by multiple references. Furthermore, the rectangular structure is the easiest structure to achieve high precision in machining. A groove with smooth boundaries and precise dimensions can be quickly machined using CNC milling. The parallelism of the upper and lower edges and the perpendicularity of the left and right edges are easy to control, and the machining error can be controlled within ±0.02mm, improving the accuracy of the reference groove 40 and thus improving the accuracy of the long spring detection.

[0021] See Figure 2 As shown, the position and dimensions of the reference groove 40 can be adjusted according to the needs of different long springs. Specifically, the height tolerance of the long spring 50 to be tested is L±a, the height from the center point of the reference groove 40 to the base 10 is h, h=L, and the distance from both sides of the reference groove 40 along the axial direction to the center point of the reference groove 40 is d1, d1=a. For example, if the free height tolerance of the long spring 50 to be tested is 126±1.5mm, then h=126, d1=1.5mm, that is, the axial distance from the center point of the reference groove 40 to the base 10 is 126mm, the distance from both sides of the reference groove 40 along the axial direction to the center point of the reference groove 40 is 1.5mm, and the axial height of the reference groove 40 is 3mm.

[0022] The circumferential angular deviation at the upper end of the long spring 50 under test is ±α, and the distance from both sides of the reference groove 40 along its width to the center point of the reference groove 40 is d2. Where D is the mean diameter of the long spring 50 to be tested. There is a specific geometric relationship between the circumferential angular deviation of the upper end of the long spring 50 and its radial left-right offset. Therefore, the range of the circumferential angular deviation can be defined by the two sides of the width direction of the reference groove 40. For example, if the circumferential angular deviation of the upper end of the long spring 50 is ±9°, and the mean diameter of the long spring 50 is 22.5mm, then d2 = 1.76mm, meaning that the distance between the two sides of the reference groove 40 and the center point of the reference groove 40 is 1.76mm, and the horizontal width of the reference groove 40 is 3.52mm.

[0023] See Figure 1 As shown, in this embodiment, the lower surface of the base 10 is provided with an anti-slip pad 11. This is used to increase the friction between the base 10 and the testing table, preventing the base 10 from shifting during the testing process, thereby ensuring testing accuracy. Of course, to prevent the base 10 from shifting, it can also be fixedly installed on the testing table.

[0024] Based on the above embodiments, the working principle of the long spring detection device provided by this utility model is as follows: Slide the spring 50 to be tested from above the positioning post 20 to the bottom, rotate the spring so that its lower end is in close contact with the contact surface 31 of the positioning part 30, and manually inspect the upper end of the spring. If the top reference surface 51 is within the axial height range of the reference groove 40, the free height of the spring is qualified; if the edge 52 of the spring 50 to be tested is within the horizontal width range of the reference groove 40, the circumferential angular deviation of the spring is qualified; otherwise, it is unqualified.

[0025] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A long spring detection device, characterized by, include: Base; A positioning post is erected vertically on top of the base to position the spring to be measured along the axial direction. The positioning part is located on the upper surface of the base and fixed to one side of the positioning post, and is used to position the lower end edge of the spring to be measured. A reference groove is formed along the axial direction of the positioning post on the side of the positioning post away from the positioning part. It is used to determine whether the upper end of the long spring to be tested falls into the projected area of ​​the reference groove, so as to determine whether the free height of the long spring to be tested and the circumferential angular deviation of the upper end are within the preset tolerance.

2. The long spring detection apparatus according to claim 1, characterized by The upper end of the spring to be tested has a top reference surface and an edge extending radially outward. When the top reference surface is within the axial height range of the reference groove, the free height of the spring to be tested is within a preset tolerance. When the edge is within the horizontal width range of the reference groove, the circumferential angular deviation of the upper end of the spring to be tested is within a preset tolerance.

3. The long spring detection apparatus of claim 1, wherein The contact surface between the positioning part and the spring to be measured is coaxial with the central axis of the reference groove.

4. The long spring detection apparatus of claim 1, wherein The reference groove is a rectangular groove.

5. The long spring detection apparatus of claim 1, wherein The height tolerance of the spring to be measured is L±a, the height from the center point of the reference groove to the base is h, h=L, and the distance from both sides of the reference groove along the axial direction to the center point of the reference groove is d1, d1=a.

6. The long spring detection apparatus of claim 1, wherein The circumferential direction angle deviation amount of the upper end of the long spring to be measured is ±α, and the distance from the two side edges of the reference groove in the width direction to the center point of the reference groove is d2, where D is the mean diameter of the long spring to be measured.

7. The long spring detection apparatus of claim 1, wherein The lower surface of the base is provided with an anti-slip pad.

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