A lead screw type diameter measuring device

Abstract

The utility model discloses a kind of screw rod class diameter measuring equipment, including base;Mounting body, fixedly arranged on base;First clamping component and second clamping component, oppositely set on mounting body, wherein first clamping component can be moved relative to second clamping component, the measuring space of accommodating to-be-measured screw rod is formed between first clamping component and second clamping component;Measuring needle group, including three measuring needles, wherein two measuring needles are set on one side of measuring space, one measuring needle is set on opposite side of measuring space, for cooperating with the thread groove of to-be-measured screw rod;Driving mechanism, connected with first clamping component, for driving its movement to adjust the size of measuring space;Digital display, mounted on mounting body;Advantages are to realize the stable positioning and quick clamping of three needles, simplify measurement operation process, directly read diameter value, effectively improve the efficiency and accuracy of screw rod diameter measurement.

Description

Technical Field

[0001] This utility model relates to a measuring device, and more particularly to a lead screw type pitch diameter measuring device. Background Technology

[0002] In modern precision machinery manufacturing, threads and lead screws, as crucial transmission and connection components, directly impact the operational accuracy, transmission efficiency, and service life of mechanical equipment due to their machining precision. The thread pitch diameter, as one of the key parameters of a thread, is a core indicator for evaluating thread quality, determining the fit and interchangeability of the threaded pair. Therefore, accurate and efficient measurement of the thread pitch diameter is of great significance for ensuring product quality and improving production efficiency. As the manufacturing industry moves towards precision and automation, the requirements for the accuracy and efficiency of thread pitch diameter measurement are becoming increasingly stringent.

[0003] Currently, the most commonly used method for measuring the pitch diameter of threads in industrial production is the three-needle measurement method. This method involves placing three precision measuring needles of the same diameter in the grooves of the thread being measured. Two needles are placed in adjacent grooves on the same side, and the third is placed in the corresponding intermediate groove on the opposite side. Then, using measuring tools such as an outside micrometer, lever micrometer, or universal length measuring instrument, the maximum distance between the outer contours of the measuring needles is measured. Finally, the thread pitch diameter is calculated using the appropriate formula. This measurement method is widely used in the field of thread inspection due to its high accuracy and clear principle; it is an indirect measurement method.

[0004] However, the traditional three-needle measurement method has significant shortcomings in practical applications. During the measurement process, the operator must manually and accurately place the three measuring needles at the designated positions on the thread grooves, while simultaneously supporting the workpiece and measuring needles with one hand and operating the micrometer with the other. This method suffers from poor stability, with the measuring needles easily slipping or shifting position, leading to increased measurement errors. This problem is particularly pronounced when measuring small-diameter threads or conducting batch inspections. Furthermore, the actual pitch diameter value must be calculated after each measurement, increasing workload and reducing inspection efficiency, making it difficult to meet the demands of rapid and accurate inspection in modern production. Therefore, there is an urgent need for a thread pitch diameter measuring device that simplifies the operation process and improves measurement stability and efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a lead screw pitch diameter measuring device that can achieve stable positioning and quick clamping of three needles, simplify the measurement operation process, directly read the pitch diameter value, and effectively improve the efficiency and accuracy of lead screw pitch diameter measurement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lead screw pitch diameter measuring device, comprising:

[0007] Base;

[0008] The mounting body is fixedly mounted on the base;

[0009] A first clamping component and a second clamping component are disposed opposite to each other on the mounting body, wherein the first clamping component is movable relative to the second clamping component, and a measuring space for accommodating the lead screw to be measured is formed between the first clamping component and the second clamping component;

[0010] The measuring probe assembly includes three measuring probes, two of which are located on one side of the measuring space and one measuring probe is located on the opposite side of the measuring space, for engaging with the thread grooves of the lead screw to be measured.

[0011] A drive mechanism, connected to the first clamping component, is used to drive its movement to adjust the size of the measuring space;

[0012] A digital display is mounted on the mounting body. The measuring head of the digital display cooperates with the first clamping component to display the mean diameter measurement value when the lead screw to be measured is supported and positioned by the measuring needle group.

[0013] Preferably, a mounting block is fixedly provided on one side of the mounting body, the digital display is fixed on the mounting block, the mounting block is provided with a through groove, and the measuring head of the digital display passes through the through groove to cooperate with the first clamping component.

[0014] Preferably, the driving mechanism includes a handle, a compression spring, and a rotating part. The rotating part is rotatably connected to the mounting body, the handle is connected to the rotating part, the first clamping member is fixed on the rotating part, and the compression spring is disposed between the rotating part and the mounting block and is used to drive the first clamping member to move closer to the second clamping member.

[0015] Preferably, the rotating part is provided with a spring mounting post, the mounting block is provided with a spring receiving hole, the compression spring is sleeved on the spring mounting post, one end of which abuts against the rotating part, and the other end extends into the spring receiving hole and abuts against the bottom of the hole.

[0016] Preferably, an adjusting block is fixed on the mounting body, and the adjusting block is provided with a plurality of horizontally spaced mounting holes. The adjusting block is fixedly connected to the mounting body by a locking bolt passing through one of the mounting holes, so as to adjust the position of the second clamping component.

[0017] Preferably, the mounting body has a plate-like structure, the upper part of the mounting body is provided with an opening groove for the lead screw to be tested to pass through, and the lower part of the mounting body is fixed to the base by a vertical rod.

[0018] Preferably, the base has multiple support feet at its bottom, and the support feet are tapered.

[0019] Preferably, the handle has a rod-shaped structure, with one end fixedly connected to the rotating part and the other end provided with anti-slip patterns.

[0020] Compared with existing technologies, the advantages of this utility model are as follows: This lead screw pitch diameter measuring device combines the core principle of the traditional three-needle measurement method with modern digital display technology, realizing rapid and accurate measurement of the thread pitch diameter. The device forms a stable support frame through the base and mounting body. The first and second clamping components are arranged opposite each other to form an adjustable measuring space. This design allows the device to adapt to the measurement needs of lead screws of different specifications. The measuring needle group adopts a classic three-needle configuration, namely an asymmetrical distribution of two needles on one side and one needle on the other side, ensuring that the measuring needles can accurately contact the thread grooves and form a stable three-point support. In actual measurement operation, the operator controls the movement of the first clamping component through the drive mechanism to quickly adjust the size of the measuring space to open it for the lead screw to be measured. When the lead screw is in place, the drive mechanism is released, and the first clamping component automatically clamps under the action of the elastic element, so that the three measuring needles are accurately embedded in the thread grooves. This automatic positioning and clamping design completely solves the problem of needing to manually fix the measuring needles and the easy slippage in traditional three-needle measurement. The entire operation can be completed with one hand, greatly simplifying the measurement process.

[0021] The digital display's measuring head precisely engages with the first clamping component, enabling real-time sensing of the clamping component's positional changes. Once the lead screw under test is stably supported by the measuring needle assembly, the digital display directly displays the thread's pitch diameter value without any subsequent calculations. This direct-reading design not only eliminates the calculation step in traditional methods, avoiding human error, but also significantly improves measurement efficiency. In batch inspection scenarios, operators can perform measurements quickly and continuously, requiring only three simple steps each time: placing the workpiece, reading the value, and removing the workpiece. This significantly reduces inspection time and labor costs. Direct-reading measurement reduces the skill requirements for operators, and stable, reliable measurement results reduce quality issues caused by measurement errors, thus improving product pass rates. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is the front view of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the second clamping component in this utility model;

[0026] Figure 4 This is a three-dimensional structural diagram of the mounting block in this utility model;

[0027] In the diagram, 1. Base; 2. Mounting body; 3. First clamping component; 4. Second clamping component; 5. Measuring space; 6. Measuring needle; 7. Drive mechanism; 8. Digital display; 9. Measuring head; 10. Mounting block; 11. Through slot; 12. Handle; 13. Compression spring; 14. Rotating part; 15. Spring mounting post; 16. Spring receiving hole; 17. Adjusting block; 18. Mounting hole; 19. Locking bolt; 20. Opening slot; 21. Upright pole; 22. Support foot. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Example 1: As Figures 1-4 As shown, a lead screw type pitch diameter measuring device includes:

[0030] Base 1;

[0031] Mounting body 2 is fixedly mounted on base 1;

[0032] The first clamping component 3 and the second clamping component 4 are disposed opposite to each other on the mounting body 2, wherein the first clamping component 3 is movable relative to the second clamping component 4, and a measuring space 5 for accommodating the lead screw to be measured is formed between the first clamping component 3 and the second clamping component 4.

[0033] The measuring needle assembly includes three measuring needles 6, two of which are located on one side of the measuring space 5 and one measuring needle 6 is located on the opposite side of the measuring space 5, for engaging with the thread groove of the lead screw to be measured.

[0034] The drive mechanism 7 is connected to the first clamping component 3 and is used to drive its movement to adjust the size of the measuring space 5.

[0035] The digital display 8 is mounted on the mounting body 2. The measuring head 9 of the digital display 8 cooperates with the first clamping component 3 to display the mean diameter measurement value when the lead screw to be measured is supported and positioned by the measuring needle 6 group.

[0036] Example 2: Figures 1-4 As shown, unlike Embodiment 1, a mounting block 10 is fixedly provided on one side of the mounting body 2, and a digital display 8 is fixed on the mounting block 10. A through groove 11 is provided on the mounting block 10, and the measuring head 9 of the digital display 8 passes through the through groove 11 and cooperates with the first clamping component 3.

[0037] Mounting block 10 serves as a dedicated mounting platform for digital display meter 8, providing a stable support foundation and ensuring the overall rigidity and stability of the measurement system. The through slot 11 not only provides a precise guide channel for the measuring head 9 of the digital display meter 8 to pass through, but also protects the measuring head 9 from lateral forces or accidental collisions during use. After passing through the through slot 11, the measuring head 9 directly engages with the first clamping component 3. This compact layout shortens the measurement chain, reduces intermediate transmission links, and improves measurement accuracy and response speed.

[0038] The fixed connection between the mounting block 10 and the mounting body 2 ensures the positional accuracy of the entire measurement system and avoids measurement errors caused by loose installation or vibration. At the same time, this modular design facilitates the installation, debugging and maintenance of the digital display 8. When it is necessary to calibrate or replace the digital display 8, it can be operated independently without affecting other components, which improves the maintainability and service life of the equipment.

[0039] In this embodiment, the drive mechanism 7 includes a handle 12, a compression spring 13, and a rotating part 14. The rotating part 14 is rotatably connected to the mounting body 2. The handle 12 is connected to the rotating part 14. The first clamping member 3 is fixed on the rotating part 14. The compression spring 13 is disposed between the rotating part 14 and the mounting block 10 and is used to drive the first clamping member 3 to approach the second clamping member 4.

[0040] The rotating part 14, as the core component of the entire drive system, is mounted on the mounting body 2 by means of rotational connection. This connection means that the rotating part 14 can rotate around a fixed axis, converting the operating force of the handle 12 into the movement of the first clamping component 3. Furthermore, the connection between the handle 12 and the rotating part 14 provides the operator with a good lever arm effect, so that a small operating force can generate sufficient clamping force, thereby reducing the operator's labor intensity.

[0041] The design of the first clamping component 3 fixed to the rotating part 14 makes them a single moving unit. When the rotating part 14 rotates under the drive of the handle 12, the first clamping component 3 is displaced accordingly, realizing the opening and closing adjustment of the measuring space 5. The clamping spring 13 is located between the rotating part 14 and the mounting block 10. The elastic force of the spring always acts on the rotating part 14, creating a tendency for the first clamping component 3 to move closer to the second clamping component 4. This continuous elastic clamping force ensures that the lead screw to be measured can be stably clamped during the measurement process, and the three measuring needles 6 can be reliably held in the thread grooves. When the operating handle 12 causes the rotating part 14 to rotate outward against the spring force, the measuring space 5 opens to facilitate the placement of the workpiece. After releasing the handle 12, the restoring force of the clamping spring 13 automatically drives the first clamping component 3 to reset and clamp the workpiece, realizing the automatic clamping function.

[0042] The design of this drive mechanism 7 also features good adaptability and safety. The presence of the clamping spring 13 provides a degree of flexibility in the clamping force, allowing it to adapt to slight differences in workpiece size and avoiding damage to the workpiece or measuring needle 6 that might be caused by rigid clamping. The spring force is carefully designed to ensure sufficient clamping stability without generating excessive pressure that could affect measurement accuracy. The entire drive mechanism 7 is compact and reliable in operation. The opening and closing of the measuring space 5 and the clamping and releasing of the workpiece can be completed through simple operation of the handle 12, greatly improving the convenience and efficiency of the measurement operation.

[0043] In this embodiment, a spring mounting post 15 is provided on the rotating part 14, and a spring receiving hole 16 is provided on the mounting block 10. The compression spring 13 is sleeved on the spring mounting post 15, with one end abutting against the rotating part 14 and the other end extending into the spring receiving hole 16 and abutting against the bottom of the hole.

[0044] The spring mounting post 15 provides reliable positioning and guiding function for the compression spring 13, preventing the spring from shifting or becoming unstable during compression and extension, and ensuring that the spring force always acts in the predetermined direction. The spring receiving hole 16 not only provides a stable support point for the other end of the spring, but also protects the spring and prevents the spring end from being disturbed by external factors during operation.

[0045] The fitting method of the compression spring 13 onto the spring mounting post 15 ensures a coaxial fit between the spring and the mounting post, guaranteeing the straightness and stability of the spring during compression and effectively preventing lateral bending deformation. The installation method, where one end of the spring abuts against the rotating part 14 and the other end extends into the spring receiving hole 16 and abuts against the bottom of the hole, forms a clear force transmission path. The elastic force of the spring can act directly and efficiently on the rotating part 14, pushing the first clamping component 3 closer to the second clamping component 4. This structural design is compact and reasonable, making full use of limited installation space while ensuring the reliability and durability of the drive mechanism 7, and facilitating the installation, replacement, and maintenance of the spring.

[0046] In this embodiment, an adjustment block 17 is fixed on the mounting body 2. The adjustment block 17 is provided with a plurality of horizontally spaced mounting holes 18. The adjustment block 17 is fixedly connected to the mounting body 2 by a locking bolt 19 passing through one of the mounting holes 18, so as to adjust the position of the second clamping component 4.

[0047] Multiple horizontally spaced mounting holes 18 provide discrete position adjustment options. Each mounting hole 18 represents a fixed mounting position. By selecting different mounting holes 18, the position of the second clamping component 4 in the horizontal direction can be adjusted, thereby changing the basic distance between the two clamping components and enabling the device to adapt to the measurement needs of lead screws with different diameter specifications.

[0048] The method of fixing the locking bolt 19 to the mounting body 2 by passing it through the selected mounting hole 18 is simple and reliable. The operator only needs to loosen the locking bolt 19, move the adjusting block 17 to the appropriate position so that the locking bolt 19 is aligned with the corresponding mounting hole 18, and then tighten the bolt to complete the position adjustment. This adjustment method does not require complicated tools or professional skills, and on-site operators can quickly complete the adjustment according to the specifications of the lead screw to be measured. The spacing of the mounting holes 18 is reasonably designed to cover the range of commonly used lead screw specifications while ensuring sufficient locking strength and stability at each position. The fixed connection between the adjusting block 17 and the mounting body 2 ensures the positional accuracy and stability of the second clamping component 4 during the measurement process, preventing displacement due to the measuring force and ensuring the accuracy and repeatability of the measurement results.

[0049] Example 3: Figures 1-4 As shown, unlike Embodiment 2, the mounting body 2 has a plate-like structure. The upper part of the mounting body 2 is provided with an opening groove 20 for the lead screw to be tested to pass through, and the lower part of the mounting body 2 is fixed to the base 1 by a vertical rod 21.

[0050] The plate-shaped mounting body 2 has good rigidity and machinability, making it easy to arrange the mounting positions of various functional components on it. At the same time, the planar characteristics of the plate-shaped structure provide a precise mounting reference surface for key components such as clamping components and drive mechanism 7, ensuring the relative positional accuracy between the components.

[0051] The upper opening slot 20 provides a convenient placement channel for the lead screw to be tested. The operator can directly insert or remove the lead screw from above without complicated insertion operations. This open design is particularly suitable for rapid testing of long lead screws or on continuous production lines. The lower part of the mounting body 2 is connected to the base 1 by the upright 21 to form a stable support structure. The upright 21 raises the mounting body 2 to an appropriate working height, providing good operating space and field of vision for the measurement operation. At the same time, the vertical support of the upright 21 ensures the verticality and stability of the entire measurement system. The base 1 provides reliable foundation support, ensuring that the equipment will not shake or tilt during the measurement process. This layered structural design makes the equipment both stable and reliable, as well as easy to operate and maintain.

[0052] In this embodiment, the bottom of the base 1 is provided with a plurality of support feet 22, and the support feet 22 are tapered.

[0053] The distribution of multiple support feet 22 forms a stable support surface, effectively distributing the weight of the equipment, avoiding stress concentration, and ensuring good stability of the equipment under various working conditions. The tapered support feet 22 have tapered tips that form near-point contact with the worktable surface, reducing the contact area and making the equipment support more stable. They are less affected by the flatness of the worktable surface and can maintain the equipment's level even on slightly uneven worktable surfaces.

[0054] In this embodiment, the handle 12 has a rod-shaped structure, one end of which is fixedly connected to the rotating part 14, and the other end is provided with anti-slip patterns.

[0055] The lever-shaped handle 12 provides the operator with a good grip and lever arm length, allowing the operator to easily control the movement of the rotating part 14 with less force, achieving labor-saving operation. The fixed connection between the handle 12 and the rotating part 14 ensures that the operating force can be directly and reliably transmitted to the drive mechanism 7, avoiding operation failure caused by loose connection or slippage.

[0056] The anti-slip pattern on the other end of the handle 12 has an important practical function. In actual measurement operations, the operator's hands may sweat or become oily due to prolonged work. The anti-slip pattern can increase the friction between the hand and the handle 12, preventing the hand from slipping during operation and ensuring the safety and accuracy of the operation. The anti-slip pattern design not only improves the stability of the grip but also improves the operating feel and reduces operator fatigue. Especially in batch testing situations that require frequent operation, this humanized design can significantly improve work efficiency and operating comfort.

[0057] Before measurement, the device needs to be calibrated. Based on the specifications of the lead screw to be measured, select appropriate sets of six measuring needles and install them on the first clamping component 3 and the second clamping component 4, ensuring that two measuring needles 6 are on one side of the measuring space 5 and one measuring needle 6 is on the opposite side. If the diameter range of the lead screw to be measured is large, the base position of the second clamping component 4 can be adjusted by loosening the locking bolt 19, adjusting the position of the adjusting block 17, and re-fixing it with a suitable mounting hole 18, thereby matching the initial size of the measuring space 5 with the lead screw to be measured. Zero the digital display 8 using a standard calibration rod. Place the calibration rod into the measuring space 5 and adjust the digital display 8 to display the standard value, completing the calibration preparation.

[0058] When the formal measurement begins, the operator grips handle 12 and applies force outward to overcome the elastic force of compression spring 13, causing rotating part 14 to rotate outward. This causes the first clamping component 3, fixed to rotating part 14, to move away from the second clamping component 4, thus opening the measurement space 5. At this time, the distance between the three measuring needles 6 increases, creating sufficient space for the lead screw to be measured. The lead screw is then vertically inserted into the opening slot 20 on the upper part of the mounting body 2, aligning the lead screw axis with the measurement space 5, ensuring that the threaded portion of the lead screw is within the effective range of the three measuring needles 6.

[0059] Slowly release handle 12; the restoring force of compression spring 13 pushes rotating part 14 to rotate in the opposite direction. Under the spring force, first clamping part 3 gradually approaches second clamping part 4. As the measuring space 5 shrinks, the three measuring needles 6 gradually approach and contact the thread surface of the lead screw to be measured. Two measuring needles 6 on one side embed into two adjacent thread grooves, while a single measuring needle 6 on the other side embeds into the corresponding thread groove on the opposite side, forming a stable three-point support positioning. Compression spring 13 continues to provide appropriate clamping force, ensuring reliable contact between the measuring needles 6 and the thread grooves, while preventing excessive pressure that could deform the workpiece.

[0060] Once the measuring needle 6 is fully in place and stably supports the lead screw to be measured, the measuring head 9 of the digital display 8 senses the positional change of the first clamping component 3 through the through slot 11 on the mounting block 10. Because the measuring head 9 directly engages with the first clamping component 3, it can accurately detect the positional differences of the clamping component caused by the different lead screw pitch diameters. The sensor inside the digital display 8 converts this mechanical displacement signal into an electrical signal, which is then processed by the built-in calculation program and directly displayed on the screen as the pitch diameter value of the lead screw to be measured. The operator can directly read the measurement result without any manual calculation.

[0061] After reading and recording the measured values, operate handle 12 again to open the first clamping component 3, expanding the measuring space 5. The three measuring needles 6 disengage from the thread groove, allowing the measured lead screw to be removed from the opening slot 20. For batch testing, the above operation process can be repeated continuously, with each measurement taking only a few seconds. The entire measurement process is simple to operate, provides intuitive readings, and is highly efficient, making it particularly suitable for rapid testing needs in production environments. The tapered support feet 22 of the equipment ensure stability during the measurement process, while the anti-slip patterned handle 12 provides a good operating feel. The coordinated work of all components enables accurate and efficient measurement of the thread pitch diameter.

[0062] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A lead screw type pitch diameter measuring device, characterized in that, include: Base; The mounting body is fixedly mounted on the base; A first clamping component and a second clamping component are disposed opposite to each other on the mounting body, wherein the first clamping component is movable relative to the second clamping component, and a measuring space for accommodating the lead screw to be measured is formed between the first clamping component and the second clamping component; The measuring probe assembly includes three measuring probes, two of which are located on one side of the measuring space and one measuring probe is located on the opposite side of the measuring space, for engaging with the thread grooves of the lead screw to be measured. A drive mechanism, connected to the first clamping component, is used to drive its movement to adjust the size of the measuring space; A digital display is mounted on the mounting body. The measuring head of the digital display cooperates with the first clamping component to display the mean diameter measurement value when the lead screw to be measured is supported and positioned by the measuring needle group.

2. The lead screw type pitch diameter measuring device according to claim 1, characterized in that: A mounting block is fixedly provided on one side of the mounting body, and the digital display is fixed on the mounting block. A through groove is provided on the mounting block, and the measuring head of the digital display passes through the through groove to cooperate with the first clamping component.

3. The lead screw type pitch diameter measuring device according to claim 2, characterized in that: The driving mechanism includes a handle, a pressure spring, and a rotating part. The rotating part is rotatably connected to the mounting body. The handle is connected to the rotating part. The first clamping component is fixed on the rotating part. The pressure spring is disposed between the rotating part and the mounting block and is used to drive the first clamping component to move closer to the second clamping component.

4. The lead screw type pitch diameter measuring device according to claim 3, characterized in that: The rotating part is provided with a spring mounting post, and the mounting block is provided with a spring receiving hole. The compression spring is sleeved on the spring mounting post, with one end abutting against the rotating part and the other end extending into the spring receiving hole and abutting against the bottom of the hole.

5. The lead screw type pitch diameter measuring device according to claim 1, characterized in that: An adjusting block is fixed on the mounting body. The adjusting block has multiple horizontally spaced mounting holes. The adjusting block is fixedly connected to the mounting body by a locking bolt passing through one of the mounting holes, so as to adjust the position of the second clamping component.

6. The lead screw pitch diameter measuring device according to claim 1, characterized in that: The mounting body has a plate-like structure. The upper part of the mounting body is provided with an opening groove for the lead screw to be tested to pass through. The lower part of the mounting body is fixed to the base by a vertical rod.

7. The lead screw type pitch diameter measuring device according to claim 1, characterized in that: The base has multiple support feet at its bottom, and the support feet are tapered.

8. A lead screw pitch diameter measuring device according to claim 3, characterized in that: The handle has a rod-shaped structure, with one end fixedly connected to the rotating part and the other end provided with anti-slip patterns.

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