Internal thread workpiece pitch diameter measuring device

Abstract

The utility model relates to a pitch diameter measuring device for an internal thread workpiece. The pitch diameter measuring device comprises a dial indicator, a dial indicator measuring head, a locking device, an extension rod shell, an extension rod, a main shell, a sliding measuring head, a mounting seat, an adapter seat, a detachable measuring head, a connecting rod, a spring and an L-shaped lever. The device is simple and reasonable in structure, changes the traditional measurement concept, measures the pitch diameter of a large-size internal thread workpiece by using a comparative measurement method, can adjust any range, is simple, convenient and rapid to operate, and achieves high-precision measurement.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, specifically providing an internal thread diameter measuring device, which is particularly useful for convenient, fast and high-precision measurement of the mean diameter of large-sized internal thread workpieces with internal threads ranging from 300mm to 500mm. Background Technology

[0002] Existing thread scanners can be used for inspection, but they can only calibrate the pitch diameter of internal threads from 0 to 150 mm, and cannot measure the pitch diameter of large-sized internal threads. If a horizontal length measuring instrument is used, it can only measure up to 300 mm, and issues such as workpiece weight and inspection methods make the process inconvenient, inefficient, difficult to operate, and risky of damaging the machine. Using a coordinate measuring machine (CMM) requires a matching dedicated probe and measurement program, which is expensive and inefficient. To overcome these shortcomings, a measuring device is designed to inspect large-sized internal thread workpieces, achieving convenient, fast, and high-precision measurement of the pitch diameter of (300-500) mm internal thread workpieces. This measuring device is low in manufacturing cost, simple to operate, and achieves the required measurement accuracy. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a simple, rationally designed, and easy-to-use measuring device for large-size internal thread workpieces. It employs a comparative measurement method, using a length measuring machine to adjust the distance between the measuring heads on both sides of the device to the nominal value of the mean diameter of the threaded workpiece being measured. The measuring device is then placed within the internal threaded workpiece for data analysis and comparison. This design is simple in structure, easy to install, and convenient to store.

[0004] The technical solution of this utility model is:

[0005] A device for measuring the pitch diameter of an internal threaded workpiece is provided, comprising a dial indicator 1, a dial indicator probe 2, a locking device 4, an extension rod housing 3, an extension rod 5, a main housing 6, a sliding probe 7, a mounting base 8, an adapter base 9, a detachable probe 10, a connecting rod 11, a spring 12, and an L-shaped lever 13.

[0006] The lower end of the extension rod housing 3 is fixedly connected to the upper end of the main housing 6, and the vertical inner cavity of the extension rod housing 3 communicates with the horizontal inner cavity of the main housing 6; the extension rod is slidably disposed in the vertical inner cavity, the sliding probe 7 is horizontally slidably disposed in the horizontal inner cavity, and the front end of the sliding probe 7 protrudes from the front end of the main housing; the spring is disposed in the horizontal inner cavity to provide elastic restoring force for the sliding probe 7; the L-shaped lever 13 is rotatably disposed in the horizontal inner cavity; the rear end of the sliding probe 7 is hinged to one end of the L-shaped lever, and the other end of the L-shaped lever is hinged to the lower end of the connecting rod 11; the upper part of the connecting rod 11 extends into the vertical inner cavity, and the lower part of the connecting rod 11 extends into the horizontal inner cavity; the upper end of the connecting rod 11 is detachably connected to the lower end of the extension rod 5; the dial indicator 1 is installed at the upper end of the extension rod housing, and the probe of the dial indicator is detachably connected to the upper end of the extension rod 5;

[0007] The rear end of the main housing 6 is provided with a mounting base. One end of the adapter is adapted and fixedly connected to the mounting base, and the other end of the adapter can be connected and fixed or disassembled and separated from the detachable probe 10.

[0008] When the sliding probe 7 is pushed inward and slides, it will cause the L-shaped lever to swing, which will cause the connecting rod to move in tandem and drive the extension rod to move vertically, thus causing the dial indicator probe to move. The dial indicator outputs the displacement amount, which can be used to characterize the displacement amount of the sliding probe 7. The measurement value can be obtained by combining the distance between the sliding probe 7 and the detachable probe 10.

[0009] Furthermore, the lower end of the extension rod housing 3 is threadedly connected to the upper end of the main housing 6.

[0010] Furthermore, the rear end of the main housing 6 is integrally formed with the mounting base.

[0011] Furthermore, the mounting base and the adapter base are connected by a thread.

[0012] Furthermore, the detachable probe is a component comprising multiple detachable probes of different lengths, adaptable to thread inspection of different diameters.

[0013] Furthermore, the spring is a helical spring and is sleeved on the sliding probe.

[0014] Furthermore, the connecting rod and the extension rod are threaded together, and the total length of the connecting rod and the extension rod can be adjusted by rotating the extension rod.

[0015] Furthermore, the dial indicator is a digital dial indicator.

[0016] Adjust the distance between the probes on both sides of the measuring device to the nominal value of the pitch diameter of the internal thread workpiece being measured using a length measuring machine. Adjust the reading of the dial indicator to "zero". Then place the measuring device on the pitch diameter of the internal thread being measured and use the dial indicator to obtain a measurement value. This actual measurement value can characterize or, through calibration, the pitch diameter value of the internal thread workpiece can be obtained.

[0017] The advantages of this utility model are: the structure is simple and reasonable, it changes the traditional measurement concept, and uses a comparative measurement method to measure the mean diameter of large-sized internal thread workpieces. It can be adjusted to any range, and the operation is simple, convenient, fast and high-precision. Attached Figure Description

[0018] Figure 1 An exploded view of the structure of this utility model;

[0019] Figure 2 This is a partial sectional view of the present invention;

[0020] The components include: 1. Dial indicator; 2. Dial indicator probe; 4. Locking device; 3. Extension rod housing; 5. Extension rod; 6. Main housing; 7. Sliding probe; 8. Mounting base; 9. Adapter base; 10. Detachable probe; 11. Connecting rod; 12. Spring; 13. L-shaped lever; 14. Threaded connection structure. Detailed Implementation

[0021] The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described, and these examples should not be construed as limited to those set forth herein. Rather, these examples are described so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0022] A device for measuring the pitch diameter of an internal threaded workpiece is provided, comprising a dial indicator 1, a dial indicator probe 2, a locking device 4, an extension rod housing 3, an extension rod 5, a main housing 6, a sliding probe 7, a mounting base 8, an adapter base 9, a detachable probe 10, a connecting rod 11, a spring 12, and an L-shaped lever 13.

[0023] The lower end of the extension rod housing 3 is fixedly connected to the upper end of the main housing 6, and the vertical inner cavity of the extension rod housing 3 communicates with the horizontal inner cavity of the main housing 6; the extension rod is slidably disposed in the vertical inner cavity, the sliding probe 7 is horizontally slidably disposed in the horizontal inner cavity, and the front end of the sliding probe 7 protrudes from the front end of the main housing; the spring is disposed in the horizontal inner cavity to provide elastic restoring force for the sliding probe 7; the L-shaped lever 13 is rotatably disposed in the horizontal inner cavity; the rear end of the sliding probe 7 is hinged to one end of the L-shaped lever, and the other end of the L-shaped lever is hinged to the lower end of the connecting rod 11; the upper part of the connecting rod 11 extends into the vertical inner cavity, and the lower part of the connecting rod 11 extends into the horizontal inner cavity; the upper end of the connecting rod 11 is detachably connected to the lower end of the extension rod 5; the dial indicator 1 is installed at the upper end of the extension rod housing, and the probe of the dial indicator is detachably connected to the upper end of the extension rod 5;

[0024] The rear end of the main housing 6 is provided with a mounting base. One end of the adapter is adapted and fixedly connected to the mounting base, and the other end of the adapter can be connected and fixed or disassembled and separated from the detachable probe 10.

[0025] When the sliding probe 7 is pushed inward and slides, it will cause the L-shaped lever to swing, which will cause the connecting rod to move in tandem and drive the extension rod to move vertically, thus causing the dial indicator probe to move. The dial indicator outputs the displacement amount, which can be used to characterize the displacement amount of the sliding probe 7. The measurement value can be obtained by combining the distance between the sliding probe 7 and the detachable probe 10.

[0026] The lower end of the extension rod housing 3 is threadedly connected to the upper end of the main housing 6.

[0027] The rear end of the main housing 6 is integrally formed with the mounting base.

[0028] The mounting base and the adapter base are connected by a thread.

[0029] The detachable probe is a component comprising multiple detachable probes of different lengths, adaptable to thread inspection of different diameters.

[0030] The spring is a helical spring and is sleeved on the sliding probe.

[0031] The connecting rod and the extension rod are threaded together, and the total length of the connecting rod and the extension rod can be adjusted by rotating the extension rod.

[0032] The dial indicator is a digital dial indicator.

[0033] Descriptions of various advantageous arrangements have been shown for illustrative and descriptive purposes, but such descriptions are not intended to be exclusive or limited to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. Furthermore, different advantageous examples may describe different advantages compared to other advantageous examples. One or more examples have been selected and described in order to best illustrate the principles and practical application of the examples, and to enable those skilled in the art to understand that this disclosure contains various examples with various modifications suitable for the particular intended use.

Claims

1. A device for measuring the pitch diameter of an internally threaded workpiece, characterized in that: It includes a dial indicator (1), a dial indicator probe (2), a locking device (4), an extension rod housing (3), an extension rod (5), a main housing (6), a sliding probe (7), a mounting base (8), an adapter base (9), a detachable probe (10), a connecting rod (11), a spring (12), and an L-shaped lever (13); The lower end of the extension rod housing (3) is fixedly connected to the upper end of the main housing (6), and the vertical inner cavity of the extension rod housing (3) is connected to the horizontal inner cavity of the main housing (6); the extension rod is slidably disposed in the vertical inner cavity, the sliding probe (7) is horizontally slidably disposed in the horizontal inner cavity, and the front end of the sliding probe (7) protrudes from the front end of the main housing; the spring is disposed in the horizontal inner cavity to provide elastic restoring force for the sliding probe (7); the L-shaped lever (13) is rotatably disposed in the horizontal inner cavity. In the horizontal inner cavity, the rear end of the sliding probe (7) is hinged to one end of the L-shaped lever, and the other end of the L-shaped lever is hinged to the lower end of the connecting rod (11). The upper part of the connecting rod (11) extends into the vertical inner cavity, and the lower part of the connecting rod (11) extends into the horizontal inner cavity. The upper end of the connecting rod (11) is detachably connected to the lower end of the extension rod (5). The dial indicator (1) is installed on the upper end of the extension rod housing, and the probe of the dial indicator is detachably connected to the upper end of the extension rod (5). The rear end of the main housing (6) is provided with a mounting base. One end of the adapter is adapted and fixedly connected to the mounting base, and the other end of the adapter can be connected and fixed or disassembled and separated from the detachable probe (10). When the sliding probe (7) is pushed inward and slides, it will cause the L-shaped lever to swing, which will cause the connecting rod to move in tandem and drive the extension rod to move vertically, causing the dial indicator probe to move. The dial indicator outputs the displacement amount, which can be used to characterize the displacement amount of the sliding probe (7). The measurement value can be obtained by combining the distance between the sliding probe (7) and the detachable probe (10).

2. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The lower end of the extension rod housing (3) is threaded to the upper end of the main housing (6).

3. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The rear end of the main housing (6) is integrally formed with the mounting base.

4. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The mounting base and the adapter base are connected by a thread.

5. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The detachable probe is a component comprising multiple detachable probes of different lengths.

6. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The spring is a helical spring and is sleeved on the sliding probe.

7. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The connecting rod and the extension rod are threaded together, and the total length of the connecting rod and the extension rod can be adjusted by rotating the extension rod.

8. The device for measuring the pitch diameter of an internally threaded workpiece as described in claim 1, characterized in that: The dial indicator is a digital dial indicator.

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