A detection tool for a lead screw

Abstract

The application relates to a lead screw detection tool applied to the field of lead screw detection, which comprises at least two supporting seats, the supporting seats are respectively provided with supporting parts matched with thread grooves of the lead screw, the supporting parts abut in the thread grooves of the lead screw, and the outer diameter of the lead screw does not contact the supporting parts and the supporting seats, and the detection device for detecting the runout degree of the supporting shaft of the lead screw is further arranged. The application has the technical effect that the detection result of the runout of the supporting shaft is more real to reflect the coaxial degree of the thread groove center line and the supporting shaft through the positioning mode taking the thread groove as the reference, the measurement error is reduced, and the precision and reliability of the lead screw runout detection are improved.

Description

Technical Field

[0001] This application relates to the field of lead screw testing technology, and in particular to a lead screw testing fixture. Background Technology

[0002] A lead screw is a mechanical part that converts rotary motion into linear motion. The outer edge of the lead screw has a helical threaded groove, and support shafts are provided at both ends of the lead screw.

[0003] The coaxiality of the thread groove centerline and the support shafts at both ends is an important parameter affecting the smoothness of the lead screw movement. The commonly used detection method in the existing technology is to directly mount the outer diameter of the lead screw on two V-shaped limit blocks, with the outer diameter of the lead screw in contact with the V-shaped limit blocks. Then, the probe of the lever micrometer contacts the surface of the support shafts at both ends of the lead screw, and the lead screw is slowly rotated. The runout error is evaluated by observing the change in the reading of the lever micrometer, thus realizing the detection of the degree of lead screw runout.

[0004] When using the above detection method, the outer diameter of the lead screw is assumed to be in contact with the V-shaped limit block, assuming that the center line of the outer diameter of the lead screw coincides with the center line of the thread groove. However, in actual production, due to factors such as machine tool precision, there are errors between the two parts, resulting in poor accuracy of the measured lead screw runout. Summary of the Invention

[0005] To address the issue that the default fit between the lead screw's outer diameter and the V-shaped limiting block leads to the centerline of the lead screw's outer diameter coinciding with the centerline of the thread groove, while in actual production, errors exist between these two parts due to factors such as machine tool precision, resulting in poor accuracy in measuring the lead screw runout, this application provides a lead screw testing fixture with the following technical solution: It includes at least two support seats, each with a support portion matching the thread groove of the lead screw. The support portion abuts against the thread groove of the lead screw, and the outer diameter of the lead screw does not contact either the support portion or the support seat. It also includes a testing device for detecting the runout of the lead screw's support shaft.

[0006] In one specific implementation, the support includes two limiting blocks disposed on the support base, and mounting blocks are provided on the two limiting blocks. A ball is rotatably connected to the mounting block, and the ball abuts against the threaded groove of the lead screw, while the outer diameter of the lead screw does not contact the ball or the support base.

[0007] In one specific implementation, the mounting block is provided with a connecting rod, and the limiting block is provided with a connecting groove that matches the connecting rod, and the connecting rod is threaded into the connecting groove.

[0008] In one specific implementation, the mounting block has a mounting flat portion.

[0009] In one specific implementation, the number of mounting blocks is set to one or more; when the number of mounting blocks is multiple, the multiple mounting blocks are evenly distributed along the outer edge of the limiting block.

[0010] In one specific implementation scheme, the support base is provided with a mounting hole, the limiting block is provided with a mounting bolt that passes through the limiting block and the mounting hole in sequence, the mounting bolt is threaded with a mounting nut that matches the mounting bolt, and the support base is pressed against the mounting nut and the mounting bolt.

[0011] In one specific implementation, the mounting hole is an oblong hole, the width of which matches the diameter of the mounting bolt.

[0012] In one specific implementation scheme, a first limiting groove corresponding to the mounting hole is provided on the end face of the support seat away from the limiting block, and the mounting nut is located entirely within the first limiting groove.

[0013] In one specific implementation, a stabilizing block is provided on the surface of the limiting block facing the support base, and a second limiting groove matching the stabilizing block is provided on the surface of the support base facing the limiting block, and the stabilizing block is slidably connected in the second limiting groove.

[0014] In one specific implementation, the detection device includes a lever dial indicator disposed on one side of the lead screw along its length, the probe of the lever dial indicator contacting the outer edge of the support shaft of the lead screw.

[0015] In summary, this application has the following beneficial technical effects: When it is necessary to inspect the lead screw, the operator places the lead screw on the support base, ensuring that the support part abuts against the thread groove of the lead screw, and that the outer diameter of the lead screw does not contact the support part or the support base. The inspection device is then activated to detect the runout of the lead screw's support shaft. By changing the positioning reference from the traditional "outer diameter centerline" to the "thread groove centerline," the positioning method based on the thread groove allows the runout detection results to more accurately reflect the coaxiality of the thread groove centerline and the support shaft, reducing measurement errors and improving the accuracy and reliability of lead screw runout detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a structural schematic diagram illustrating the connecting rod in the embodiments of this application.

[0018] Reference numerals in the attached diagram: 1. Lead screw; 2. Support shaft; 3. Threaded groove; 4. Support base; 5. Limiting block; 6. Mounting block; 7. Ball bearing; 8. Mounting flat; 9. Mounting hole; 10. Mounting bolt; 11. Mounting nut; 12. First limiting groove; 13. Stabilizing block; 14. Second limiting groove; 15. Connecting rod. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0020] This application discloses a screw testing fixture.

[0021] Reference Figure 1 and Figure 2 The lead screw testing fixture includes at least two support seats 4. In this embodiment, two support seats 4 are used as an example for illustration. The lead screw 1 is mounted on the two support seats 4. Each support seat 4 is provided with a support part that matches the thread groove 3 of the lead screw 1. The support part abuts against the thread groove 3 of the lead screw 1, and the outer diameter of the lead screw 1 does not contact the support part or the support seat 4. It also includes a testing device for detecting the runout of the support shaft 2 of the lead screw 1. The testing device includes a lever dial indicator disposed on one side of the lead screw 1 along its length. The probe of the lever dial indicator contacts the outer edge of the support shaft 2 of the lead screw 1.

[0022] In the traditional method, the outer diameter of the lead screw 1 is fitted with the V-shaped limiting block 5, with the center line of the outer diameter of the lead screw 1 as the positioning reference. It is assumed that this coincides with the center line of the thread groove 3. However, in actual production, there is a deviation between the two. Moreover, the accuracy of the lead screw 1 depends on the accuracy of the thread groove 3. Therefore, when it is necessary to inspect the lead screw 1, the operator sets the lead screw 1 on the support base 4, so that the support part abuts against the thread groove 3 of the lead screw 1, and the outer diameter of the lead screw 1 does not contact the support part or the support base 4. The inspection device is then started to detect the runout of the support shaft 2 of the lead screw 1. By directly matching and abutting the support part on the support base 4 with the thread groove 3 of the lead screw 1, the positioning reference is changed from the "outer diameter center line" to the "thread groove 3 center line". Since the contact between the support part and the threaded groove 3 directly corresponds to the actual position of the threaded groove 3, the posture of the lead screw 1 during testing is determined by the threaded groove 3 itself. This reduces the measurement error caused by the inconsistency between the outer diameter and the center line of the groove, making the test result of the runout of the support shaft 2 more realistically reflect the coaxiality between the center line of the threaded groove 3 and the support shaft 2, reducing the measurement error, and improving the accuracy and reliability of the runout test of the lead screw 1.

[0023] Reference Figure 1 and Figure 2The support includes two opposing limiting blocks 5 mounted on a support base 4. Mounting blocks 6 are mounted on the two limiting blocks 5, and the number of mounting blocks 6 can be one or more. When there are multiple mounting blocks 6, they are evenly distributed along the outer edge of the limiting blocks 5. In this embodiment, four mounting blocks 6 are mounted on each limiting block 5 as an example. A ball bearing 7 is rotatably connected to each mounting block 6. The ball bearing 7 abuts against the threaded groove 3 of the lead screw 1, and the outer diameter of the lead screw 1 does not contact the ball bearing 7 or the support base 4. A connecting rod 15 is fixedly connected to each mounting block 6. A connecting groove matching the size of the connecting rod 15 is provided on the limiting block 5. The connecting rod 15 is threaded into the connecting groove. The operator can remove the mounting block 6 from the limiting block 5 using the threaded disassembly method, facilitating the subsequent replacement of different models of mounting blocks 6 to accommodate different diameter threaded grooves 3. Mounting flats 8 are oppositely provided on each mounting block 6, allowing the operator to rotate the mounting block 6 to thread it onto the limiting block 5.

[0024] Reference Figure 1 and Figure 2 The support base 4 has mounting holes 9, and the limiting block 5 has mounting bolts 10 that pass through the limiting block 5 and the mounting holes 9 in sequence. The mounting holes 9 are oblong holes, and the width of the oblong holes matches the diameter of the mounting bolts 10. The mounting bolts 10 are threaded with mounting nuts 11 that match the size of the mounting bolts 10. The support base 4 is pressed between the mounting nuts 11 and the mounting bolts 10. The operator can connect the limiting blocks 5 to the support base 4 using bolts, achieving a detachable connection of the limiting blocks 5. The distance between the two limiting blocks 5 can be adjusted through the oblong mounting holes 9 to accommodate lead screws 1 of different diameters.

[0025] Reference Figure 1 and Figure 2 The support base 4 has a first limiting groove 12 corresponding to the mounting hole 9 on its end face away from the limiting block 5. The mounting nut 11 is entirely located within the first limiting groove 12. The first limiting groove 12 radially limits the mounting nut 11 through its groove wall. Since the mounting nut 11 is entirely located within the first limiting groove 12, the possibility of interference between the mounting nut 11 and external components is reduced, and the support base 4 is also easily and stably mounted on the workbench. A stabilizing block 13 is fixedly connected to the surface of the limiting block 5 facing the support base 4. A second limiting groove 14 matching the size of the stabilizing block 13 is formed on the surface of the support base 4 facing the limiting block 5. The stabilizing block 13 is slidably connected within the second limiting groove 14. In this embodiment, the mounting hole 9, the first limiting groove 12, and the second limiting groove 14 are vertically aligned on the same straight line. The second limiting groove 14 limits the position of the stabilizing block 13, reducing the possibility of shaking during the movement of the limiting block 5, and improving the stability of the limiting block 5.

[0026] The implementation principle of this application embodiment is as follows: When it is necessary to test the accuracy of the lead screw 1, the operator sets the lead screw 1 on the support base 4, so that the lead screw 1 is located between two limit blocks 5 on the same support base 4, and the balls 7 on the four limit blocks 5 respectively abut against the thread grooves 3 of the lead screw 1, and the outer diameter of the lead screw 1 does not contact the balls 7 or the support base 4; the lever micrometer is placed on one side of the lead screw 1 along its length, and the probe of the lever micrometer contacts the outer edge of the support shaft 2 of the lead screw 1 facing the lever micrometer. The operator slowly and evenly rotates the lead screw 1 by hand for one revolution, observes the maximum swing range of the lever micrometer pointer, and obtains the runout value of the support shaft 2 relative to the thread groove 3. Then, the other end of the support shaft 2 repeats this operation to complete the test of the entire lead screw 1. If the runout value error range of the support shafts 2 at both ends of the lead screw 1 is less than 0.01mm, it means that the lead screw 1 is qualified.

[0027] The positioning reference was changed from the traditional "outer diameter centerline" to the "thread groove 3 centerline". By using the thread groove 3 as the reference for positioning, the detection result of the runout of the support shaft 2 more accurately reflects the coaxiality between the thread groove 3 centerline and the support shaft 2, reducing measurement error and improving the accuracy and reliability of the runout detection of the lead screw 1.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A screw testing fixture, characterized in that: It includes at least two support seats (4), each of which is provided with a support part that matches the thread groove (3) of the lead screw (1). The support part abuts against the thread groove (3) of the lead screw (1) and the outer diameter of the lead screw (1) does not contact the support part or the support seat (4). It also includes a detection device for detecting the runout of the support shaft (2) of the lead screw (1).

2. The lead screw testing fixture according to claim 1, characterized in that: The support includes two limiting blocks (5) set on the support base (4). The two limiting blocks (5) are provided with mounting blocks (6). A ball (7) is rotatably connected to the mounting block (6). The ball (7) abuts against the threaded groove (3) of the lead screw (1) and the outer diameter of the lead screw (1) does not contact the ball (7) or the support base (4).

3. The lead screw testing fixture according to claim 2, characterized in that: The mounting block (6) is provided with a connecting rod (15), and the limiting block (5) is provided with a connecting groove that matches the connecting rod (15). The connecting rod (15) is threaded into the connecting groove.

4. The lead screw testing fixture according to claim 2, characterized in that: The mounting block (6) has a mounting flat (8) facing each other.

5. The lead screw testing fixture according to claim 2, characterized in that: The number of the mounting blocks (6) is set to one or more; when the number of the mounting blocks (6) is multiple, the multiple mounting blocks (6) are evenly distributed along the outer edge of the limiting block (5).

6. The lead screw testing fixture according to claim 2, characterized in that: The support base (4) has an installation hole (9), and the limiting block (5) has an installation bolt (10) that passes through the limiting block (5) and the installation hole (9) in sequence. The installation bolt (10) is threaded with an installation nut (11) that matches the installation bolt (10). The support base (4) is pressed between the installation nut (11) and the installation bolt (10).

7. The lead screw testing fixture according to claim 6, characterized in that: The mounting hole (9) is a waist-shaped hole, and the width of the waist-shaped hole matches the diameter of the mounting bolt (10).

8. The lead screw testing fixture according to claim 7, characterized in that: The support base (4) has a first limiting groove (12) on its end face away from the limiting block (5) that corresponds to the mounting hole (9), and the mounting nut (11) is located entirely in the first limiting groove (12).

9. The lead screw testing fixture according to claim 7, characterized in that: The limiting block (5) has a stabilizing block (13) on its surface facing the support base (4), and the support base (4) has a second limiting groove (14) that matches the stabilizing block (13) on its surface facing the limiting block (5). The stabilizing block (13) is slidably connected in the second limiting groove (14).

10. The lead screw testing fixture according to claim 1, characterized in that: The detection device includes a lever dial indicator disposed on one side of the lead screw (1) along its length, wherein the probe of the lever dial indicator contacts the outer edge of the support shaft (2) of the lead screw (1).

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