Mechanical large-diameter thread outer diameter measuring device

Abstract

The utility model discloses a mechanical large-diameter thread outer diameter measuring device, which comprises a bottom plate, and two positioning sliding rods and two measuring sliding rods which are arranged on the bottom plate, and the two positioning sliding rods can move relatively along the upper surface of the bottom plate, so that the two positioning sliding rods are close to each other to radially clamp a boss of a workpiece to be measured. The two measuring sliding rods can move relatively along the upper surface of the bottom plate, so that the two measuring sliding rods are close to each other and respectively cling to two sides of a thread of a to-be-measured workpiece, scale marking lines are arranged on the upper surface of the bottom plate, and the lower ends of the measuring sliding rods are aligned with the scale marking lines. The length limit of an outer measuring claw of a vernier caliper is broken through, the large-diameter thread diameter measuring device is suitable for measuring the outer diameter of a large-diameter thread, the measurable thread diameter range is wide, the large-diameter thread diameter measuring device is particularly suitable for batch detection of a production line, personal errors are reduced through a positioning sliding rod and scale marks, the measuring precision and stability are improved, only three steps of fixing, pulling and reading are needed during operation, the single-time measuring time is short, and the efficiency is improved. The operation process is simplified, and stable fixation, automatic adaptation and rapid reading are achieved.

Description

Technical Field

[0001] This utility model relates to the field of thread inspection tooling, and in particular to a mechanical device for measuring the outer diameter of large-diameter threads. Background Technology

[0002] In industrial production, measuring the outer diameter of gland threads is a crucial step in ensuring product dimensional compliance. Current technology typically limits the outer measuring jaw length of vernier calipers to 83mm or less, making it difficult to stably clamp large-diameter threads, resulting in significant measurement errors and cumbersome operation. While rulers or tape measures can measure larger dimensions, they lack horizontal fixing devices, making them prone to slippage or tilting errors, and requiring manual calculation of the difference between the two ends, leading to low efficiency. Furthermore, existing tools are ill-suited for measuring threads with different pitches or ultra-large diameters, especially in batch inspections where balancing accuracy and efficiency is challenging.

[0003] Specifically, the mechanical structure design of existing tools does not consider the fixing requirements of large-diameter threads, resulting in an inability to stably conform to the surface of the object being measured during measurement. This leads to low measurement accuracy, complex operation, and low efficiency, making it difficult to meet the needs of rapid batch testing on production lines.

[0004] Therefore, there is an urgent need for a mechanical measuring device that combines stable fixation, automatic adaptation, and rapid reading to solve the technical bottleneck in measuring the outer diameter of large-size threads. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical large-diameter thread outer diameter measuring device that breaks through the limitation of the length of the outer measuring jaws of vernier calipers, adapts to the measurement of large-diameter threads, and has the functions of stable fixation, automatic adaptation and fast reading.

[0006] To solve the above-mentioned technical problems, this utility model provides a mechanical large-diameter thread outer diameter measuring device, including a base plate and two positioning slide rods and two measuring slide rods mounted on the base plate. The two positioning slide rods can move relative to each other along the base plate so that they approach each other and radially clamp the boss of the workpiece to be measured. The two measuring slide rods can move relative to each other along the base plate so that they approach each other and respectively adhere to both sides of the thread of the workpiece to be measured. The base plate is provided with scale marks, and the lower end of the measuring slide rod is aligned with the scale marks.

[0007] Preferably, the base plate has a horizontally extending groove on its upper surface, the positioning slide rod is parallel to the upper surface of the base plate and extends longitudinally, and a fixed slider is installed at the head end of the positioning slide rod. The fixed slider is installed in the groove and can move laterally along the groove.

[0008] Preferably, a movable slider is movably mounted at the end of the positioning slide rod. The movable slider can move longitudinally along the positioning slide rod so that the movable slider and the fixed slider move closer to each other to axially clamp the boss of the workpiece to be measured.

[0009] Preferably, the movable slider is provided with a locking mechanism in a fixed position.

[0010] Preferably, the opposite sides of the two positioning sliders are upwardly sloping surfaces, and the fixed slider and the movable slider are triangular sliders.

[0011] Preferably, the measuring slide rod extends vertically above the base plate, and the lower end of the measuring slide rod is installed in the slide groove and can move laterally along the slide groove.

[0012] Preferably, the scale mark is set on the first edge of the base plate, the measuring slide is connected to an extension rod, the extension rod is close to the base plate and extends longitudinally, the end of the extension rod is connected to the lower part of the measuring slide, the first end of the extension rod is close to and points towards the scale mark, and the plane formed by the measuring slide and the extension rod on one side is parallel to the plane formed by the measuring slide and the extension rod on the other side.

[0013] Preferably, a double-force bar linkage system is provided between the two measuring slide bars.

[0014] Preferably, the opposing sides of the two measuring slide rods are parallel planes.

[0015] Preferably, the scale markings are asymmetrical segmented markings.

[0016] This utility model provides a mechanical large-diameter thread outer diameter measuring device, including a base plate and two positioning slide rods and two measuring slide rods mounted on the base plate. The two positioning slide rods can move relative to each other along the base plate so that they approach each other and radially clamp the boss of the workpiece to be measured. The two measuring slide rods can move relative to each other along the base plate so that they approach each other and respectively adhere to both sides of the thread of the workpiece to be measured. The base plate is provided with scale marks, and the lower end of the measuring slide rod is aligned with the scale marks.

[0017] During operation, the workpiece to be measured is placed on the base plate. Two positioning slide rods are brought closer together, radially clamping the protrusion of the workpiece to fix it in place. Then, two measuring slide rods are brought closer together, respectively fitting against both sides of the thread on the workpiece. Simultaneously, the scale aligned with the lower end of the measuring slide rod is read, ultimately obtaining the thread outer diameter. This design overcomes the limitations of the vernier caliper's outer measuring jaw length, adapting to the measurement of large-diameter threads, including threads exceeding 83mm in diameter. It offers a wide range of measurable thread diameters, making it particularly suitable for batch inspection on production lines. The positioning slide rods and scale markings reduce human error, improving measurement accuracy and stability. Operation requires only three steps: fixing, pulling, and reading. The short measurement time improves efficiency and simplifies the operation process, combining stable fixing, automatic adaptation, and rapid reading. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a specific embodiment of the mechanical large-diameter thread outer diameter measuring device provided by this utility model.

[0019] The components include: base plate 1, positioning slide bar 2, measuring slide bar 3, scale markings 4, slide groove 5, fixed slider 6, movable slider 7, extension rod 8, and workpiece to be measured 9. Detailed Implementation

[0020] The core of this utility model is to provide a mechanical large-diameter thread outer diameter measuring device that breaks through the limitation of the length of the outer measuring jaws of vernier calipers, adapts to the measurement of large-diameter threads, and has the functions of stable fixation, automatic adaptation and fast reading.

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a specific embodiment of the mechanical large-diameter thread outer diameter measuring device provided by this utility model.

[0023] This utility model provides a mechanical large-diameter thread outer diameter measuring device, including a base plate 1, two positioning slide rods 2, and two measuring slide rods 3. The base plate 1 is horizontally arranged, and the two positioning slide rods 2 and the two measuring slide rods 3 are also mounted opposite each other on the base plate 1. Further, the two positioning slide rods 2 can move relative to each other along the base plate 1, so that they approach each other and radially clamp the boss of the workpiece 9 to be measured. The two measuring slide rods 3 can move relative to each other along the base plate 1, so that they approach each other and respectively adhere to both sides of the thread of the workpiece 9 to be measured. The base plate 1 is provided with graduation marks 4, and the lower end of the measuring slide rod 3 is aligned with the graduation marks 4. The workpiece 9 to be measured is a gland, which is cylindrical in shape and has a protruding boss in the middle. The boss can be hexagonal for easy clamping and tightening with a wrench. External threads are provided on the outer walls at both ends, and the outer diameter of this external thread is to be measured.

[0024] During operation, the workpiece 9 to be measured is placed on the base plate 1. The two positioning slide rods 2 are controlled to move closer together, thereby radially clamping the boss of the workpiece 9 to fix the workpiece. Then, the two measuring slide rods 3 are controlled to move closer together, thereby respectively pressing against both sides of the thread of the workpiece 9. At the same time, the scale aligned with the lower end of the measuring slide rod 3 is read to finally obtain the outer diameter of the thread. It breaks through the limitation of the length of the external measuring jaw of the vernier caliper, adapts to the outer diameter measurement of large-diameter threads, and is suitable for threads with diameters exceeding 83mm. It has a wide range of measurable thread diameters, and is especially suitable for batch inspection on the production line. The positioning slide rods 3 and scale marks 4 reduce human error and improve measurement accuracy and stability. The operation only requires three steps: fixing, pulling, and reading. The single measurement time is short, improving efficiency and simplifying the operation process. It has the advantages of stable fixing, automatic adaptation, and fast reading.

[0025] To facilitate the smooth sliding of the slide bar, a horizontally extending groove 5 is provided on the top of the base plate 1. The horizontal direction is defined as parallel to the top of the base plate 1. The groove 5 extends horizontally, and its direction of extension is the transverse direction. The direction perpendicular to the transverse direction is the longitudinal direction. The scale mark 4 extends horizontally as a whole and is located at one end of the longitudinal direction on the base plate 1. Further, the scale mark 4 is defined as being located at the beginning of the base plate 1; that is, the end of each component closest to the scale mark 4 is the beginning, and the end furthest from the scale mark 4 is the end. During the testing process, the horizontal radial direction of the workpiece 9 to be tested is the transverse direction, and the axial direction of the workpiece 9 to be tested is the longitudinal direction.

[0026] The positioning slide rod 2 extends longitudinally parallel to the base plate 1, and a fixed slider 6 is installed at the first end of the positioning slide rod 2. The fixed slider 6 is installed in the slide groove 5 and can move laterally along the slide groove 5. At the same time, a movable slider 7 is movably installed at the end of the positioning slide rod 2. The movable slider 7 can move longitudinally along the positioning slide rod 2 so that the movable slider 7 and the fixed slider 6 move closer to each other and axially clamp the boss of the workpiece 9 to be measured.

[0027] To adapt to the shape of the workpiece, the opposite sides of the two positioning slide rods 2 are upwardly sloping surfaces, and the fixed slider 6 and the movable slider 7 are triangular sliders. Specifically, the positioning slide rod 2 is a triangular prism, and the movable slider 7 has a triangular through hole in the middle. The positioning slide rod 2 passes through the triangular through hole to guide the longitudinal movement of the movable slider 7. The shape of each component can also be adjusted as needed, all within the protection scope of this utility model.

[0028] Furthermore, the movable slider 7 is provided with a locking mechanism in a fixed position. The locking mechanism can fix the relative position of the movable slider 7 and the positioning slider 2. After the movable slider 7 and the fixed slider 6 axially clamp the boss of the workpiece 9 to be measured, the relative position of the movable slider 7 and the positioning slider 2 is fixed by the locking mechanism.

[0029] In the mechanical large-diameter thread outer diameter measuring device provided in this specific embodiment of the utility model, the measuring slide rod 3 extends vertically perpendicular to the base plate 1, and the lower end of the measuring slide rod 3 is installed in the slide groove 5 and can move laterally along the slide groove 5. Preferably, in order to avoid interference between the positioning slide rod 2 and the measuring slide rod 3, two parallel guide rail grooves can be provided in the slide groove 5, and the positioning slide rod 2 and the measuring slide rod 3 can be installed respectively. The positioning slide rod 2 is installed in the guide rail groove at the end, and the measuring slide rod 3 is installed in the guide rail groove at the beginning. Further, in order to keep the measuring slide rod 3 in a vertical state during movement, auxiliary rods extending laterally can be provided on both sides of the lower end of the measuring slide rod 3. The auxiliary rods are also embedded in the guide rail grooves, so that the measuring slide rod 3 remains upright during movement.

[0030] The scale mark 4 is located on the first edge of the base plate 1. An extension rod 8 is connected to the measuring slide rod 3. The extension rod 8 is close to the base plate 1 and extends longitudinally. The end of the extension rod 8 connects to the lower part of the measuring slide rod 3, and the first end of the extension rod 8 points towards the scale mark 4. The plane formed by one side of the measuring slide rod 3 and the extension rod 8 is parallel to the plane formed by the other side of the measuring slide rod 3 and the extension rod 8. Preferably, a double-force-bar linkage system is provided between the two measuring slide rods 3, which automatically conforms to the threaded surface when pulled, enabling direct reading of the difference value in conjunction with the scale dial, reducing human intervention. The opposite sides of the two measuring slide rods 3 are mutually parallel planes.

[0031] Based on the mechanical large-diameter thread outer diameter measuring device provided in the above specific embodiments, the scale line 4 is an asymmetrical segmented scale line, such as a key segment cut in the middle of 1-100mm, which is suitable for measuring threads of different sizes.

[0032] During operation, the workpiece 9 to be tested is placed on the base plate 1. The two positioning slide rods 2 are controlled to move closer to each other, thereby radially clamping the boss of the workpiece 9. Then, the two movable sliders 7 move towards the head end, axially clamping the boss of the workpiece 9 to fix the workpiece. Then, the two measuring slide rods 3 are controlled to move closer to each other, thereby respectively pressing against both sides of the thread of the workpiece 9, driving the two extension rods 8 to move synchronously. The head end of the extension rod 8 points to the scale line on the scale line 4. The outer diameter of the thread is finally obtained by direct reading of the difference.

[0033] The mechanical large-diameter thread outer diameter measuring device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A mechanical device for measuring the outer diameter of large-diameter threads, characterized in that, The device includes a base plate (1) and two positioning slide rods (2) and two measuring slide rods (3) mounted on the base plate (1). The two positioning slide rods (2) can move relative to each other on the base plate (1) so that the two positioning slide rods (2) approach each other and radially clamp the boss of the workpiece (9) to be measured. The two measuring slide rods (3) can move relative to each other on the base plate (1) so that the two measuring slide rods (3) approach each other and respectively adhere to the two sides of the thread of the workpiece (9) to be measured. The base plate (1) is provided with a scale mark (4), and the lower end of the measuring slide rod (3) is aligned with the scale mark (4).

2. The mechanical large-diameter thread outer diameter measuring device according to claim 1, characterized in that, The base plate (1) is provided with a horizontally extending slide groove (5). The positioning slide rod (2) is parallel to the base plate (1) and extends longitudinally. The first end of the positioning slide rod (2) is equipped with a fixed slider (6). The fixed slider (6) is installed in the slide groove (5) and can move laterally along the slide groove (5).

3. The mechanical large-diameter thread outer diameter measuring device according to claim 2, characterized in that, The end of the positioning slide bar (2) is movably mounted with a movable slider (7). The movable slider (7) can move longitudinally along the positioning slide bar (2) so that the movable slider (7) and the fixed slider (6) move close to each other and axially clamp the boss of the workpiece (9) to be measured.

4. The mechanical large-diameter thread outer diameter measuring device according to claim 3, characterized in that, The movable slider (7) is provided with a locking mechanism in a fixed position.

5. The mechanical large-diameter thread outer diameter measuring device according to claim 4, characterized in that, The two positioning sliders (2) have opposite sides that are upwardly sloping surfaces, and the fixed slider (6) and the movable slider (7) are triangular sliders.

6. The mechanical large-diameter thread outer diameter measuring device according to claim 2, characterized in that, The measuring slide rod (3) extends vertically above the base plate (1), and the lower end of the measuring slide rod (3) is installed in the slide groove (5) and can move laterally along the slide groove (5).

7. The mechanical large-diameter thread outer diameter measuring device according to claim 6, characterized in that, The scale mark (4) is set on the first edge of the base plate (1). The measuring slide (3) is connected to an extension rod (8). The extension rod (8) is close to the base plate (1) and extends longitudinally. The end of the extension rod (8) is connected to the lower part of the measuring slide (3). The first end of the extension rod (8) is close to and points towards the scale mark (4). The plane formed by the measuring slide (3) and the extension rod (8) on one side is parallel to the plane formed by the measuring slide (3) and the extension rod (8) on the other side.

8. The mechanical large-diameter thread outer diameter measuring device according to claim 7, characterized in that, A double-force linkage system is provided between the two measuring slide rods (3).

9. The mechanical large-diameter thread outer diameter measuring device according to claim 8, characterized in that, The opposing sides of the two measuring slides (3) are parallel planes.

10. The mechanical large-diameter thread outer diameter measuring device according to any one of claims 1 to 9, characterized in that, The scale markings (4) are asymmetrical segmented markings.

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