Universal external thread pitch diameter detection device

Abstract

The invention provides a universal external thread pitch diameter detection device which comprises an upper connecting seat and a lower connecting seat, a connecting plate is installed on the upper connecting seat, a via hole is formed in the connecting plate, a connecting ring is arranged at the position, corresponding to a hollow hole, of the connecting plate, and a matching hole in sliding fit with a micrometer measuring screw is formed in the inner side of the connecting ring; a limiting plate is arranged between the upper connecting base and the lower connecting base, an upper side groove is formed in the side, facing the lower connecting base, of the upper connecting base, an upper side steel bar penetrating through the upper side groove is arranged on the upper connecting base, a lower side groove is formed in the side, facing the upper connecting base, of the lower connecting base, and an upper side steel bar penetrating through the lower side groove is arranged on the lower connecting base. And functional holes corresponding to the matching holes are formed in the upper connecting seat and the lower connecting seat. The device is convenient to operate, high in measuring efficiency, high in universality, suitable for detecting small-batch and various parts with thread characteristics, capable of measuring any structural parts with the same thread pitch, and capable of measuring parts with different thread pitches by replacing the upper connecting base and the lower connecting base.

Description

Technical Field

[0001] This invention belongs to the field of industrial manufacturing, and in particular relates to a universal device for detecting the pitch diameter of external threads. Background Technology

[0002] In industrial manufacturing, threaded parts are frequently machined. After machining, thread ring gauges are typically used to inspect the threads for quality. Even with the same pitch, different thread pitch diameters require different thread ring gauges. Furthermore, there are special requirements for threaded threads with plating, and plating thicknesses vary. All these factors combined lead to the need to purchase a large number of thread ring gauges for pitch inspection. In related technologies, purchasing such a large number of thread ring gauges during new product development significantly increases R&D costs. Therefore, a three-pin diameter measurement method is generally used. This method requires holding the part, a micrometer, and three steel pins simultaneously. During measurement, two pins must be held in one thread thread and the third pin in the other, before the micrometer is used for measurement. This process is complex, inefficient, and inaccurate for inexperienced personnel. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the deficiencies in the prior art and proposes a universal device for detecting the pitch diameter of external threads.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0005] A universal device for detecting the pitch diameter of external threads includes an upper connecting seat and a lower connecting seat installed at the lower end of the micrometer frame. A connecting plate is mounted on the upper connecting seat, and the connecting plate has a through hole. A connecting ring is provided on the connecting plate at a position corresponding to the hollow hole. The inner side of the connecting ring has a mating hole for sliding engagement with the micrometer measuring screw. A limiting plate is provided between the upper and lower connecting seats. The upper connecting seat has an upper groove on the side facing the lower connecting seat, and an upper steel bar passing through the upper groove. The lower connecting seat has a lower groove on the side facing the upper connecting seat, and an upper steel bar passing through the lower groove. Both the upper and lower connecting seats have functional holes corresponding to the mating holes.

[0006] Furthermore, the through hole and the mating hole are arranged coaxially.

[0007] Furthermore, the lower connecting seat has two connecting ears on the side away from the upper connecting seat, and the two connecting ears are provided with corresponding connecting holes, forming a frame fitting space between the two connecting ears.

[0008] Furthermore, the upper connecting seat is provided with an upper steel bar, which is perpendicular to the axis of the mating hole.

[0009] Furthermore, the lower connecting seat is provided with two lower steel bars, which are arranged in parallel and are perpendicular to the axis of the mating hole.

[0010] Furthermore, the connecting plate is L-shaped, with the connecting ring fixed at one end and the other end connected to the upper connecting seat.

[0011] Furthermore, the connecting plate is fixed to the upper connecting seat by screws.

[0012] Furthermore, the limiting plate is installed on the side of the upper connecting seat away from the connecting plate by screws, and its surface facing the upper connecting seat is simultaneously in contact with the side wall of the upper connecting seat and the side wall of the lower connecting seat.

[0013] Furthermore, the inner diameter of the functional hole is the same as that of the mating hole.

[0014] Furthermore, the inner diameter of the through hole is greater than or equal to the inner diameter of the mating hole.

[0015] Compared with existing technologies, the present invention has the following advantages:

[0016] This invention is easy to operate, has high measurement efficiency, and is highly versatile. It is suitable for inspecting small batches of various types of threaded parts. It can measure any structural parts with the same thread pitch. By changing the upper and lower connecting seats, it can also measure parts with different thread pitches. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure created by this invention;

[0019] Figure 2 This provides another perspective for illustrating the invention.

[0020] Figure 3 A schematic diagram of one side of the limiting plate for this invention;

[0021] Figure 4 A schematic diagram of the upper connecting seat portion in the present invention;

[0022] Figure 5 This is a schematic diagram showing the invention installed on a micrometer;

[0023] Figure 6 This is a schematic diagram illustrating the installation and application of this invention. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] A general-purpose device for detecting the pitch diameter of external threads, such as Figures 1 to 6 As shown, the device includes an upper connecting seat 1 and a lower connecting seat 2 installed at the lower end of the micrometer frame 18. A connecting plate 3 is mounted on the upper connecting seat, and a through hole 4 is provided on the connecting plate. A connecting ring 5 is provided on the connecting plate at the position corresponding to the through hole. A mating hole 6 is provided on the inner side of the connecting ring for sliding engagement with the micrometer measuring screw 18. A limiting plate 7 is provided between the upper and lower connecting seats. The upper connecting seat has an upper groove 8 on the side facing the lower connecting seat, and an upper steel rod 9 penetrating the upper groove. The lower connecting seat has a lower groove 10 on the side facing the upper connecting seat, and an upper steel rod 11 penetrating the lower groove. Both the upper and lower connecting seats have functional holes 12 corresponding to the mating holes.

[0029] Typically, the through hole and the mating hole are arranged coaxially. The upper connecting seat has an upper steel bar perpendicular to the axis of the mating hole. The lower connecting seat has two lower steel bars 16, arranged parallel to each other and both perpendicular to the axis of the mating hole. The functional hole has the same inner diameter as the mating hole. The inner diameter of the through hole is greater than or equal to the inner diameter of the mating hole. Using this testing device in conjunction with a micrometer can optimize the stress state of the micrometer measuring screw and improve measurement stability and repeatability.

[0030] In an optional embodiment, the lower connecting seat has two connecting lugs 13 on the side away from the upper connecting seat, and corresponding connecting holes 14 are provided on the two connecting lugs, forming a frame fitting space 15 between the two connecting lugs. The lower end of the micrometer frame can be inserted into the frame fitting space, and the lower connecting seat is fixed to the lower end of the micrometer frame by screws passing through the connecting holes. Therefore, the present invention can also replace the lower connecting seat for use, and by changing the diameter and hole spacing (integer multiples of the pitch) of the mounting holes for the steel rod on the upper and lower connecting seats, the thread pitch diameter measurement of different pitches can be achieved.

[0031] The connecting plate is L-shaped, with the connecting ring fixed at one end and the other end connected to the upper connecting seat. As an example of a specific assembly method, the connecting plate is preferably fixed to the upper connecting seat with screws: the corresponding end of the connecting plate has pre-set threaded holes or smooth holes matching the screw specifications, and the upper connecting seat has corresponding positioning holes. During assembly, the connecting plate and the mounting surface of the upper connecting seat are first precisely fitted using positioning pins or guide structures to ensure hole alignment. Then, high-strength internal hexagonal screws, Phillips head countersunk screws, or other suitable fasteners are selected and tightened sequentially according to the preset torque. To further improve connection reliability, flat washers, spring washers, or anti-loosening nuts can be added to the contact surface between the screws and the connecting plate to effectively resist the risk of loosening caused by vibration, impact, and other working conditions. If the application scenario involves a corrosive environment, stainless steel screws can be used, or the connection parts can be treated with rust prevention (such as galvanizing or coating with anti-rust paint) to extend the service life of the overall structure.

[0032] During measurement, the connecting ring moves and rotates axially with the micrometer screw of the micrometer. The connecting ring drives the connecting plate to move axially with the micrometer screw of the micrometer. The connecting plate drives the upper connecting seat to move axially with the micrometer screw of the micrometer (the connecting ring and the connecting plate are an integral structure and move synchronously). As the upper connecting seat moves down the micrometer screw of the micrometer, the steel bars on the two connecting seats gradually approach each other, so that each steel bar fits against the part to be measured without bending, thereby measuring the thread pitch diameter of the part between the upper and lower connecting seats.

[0033] The limiting plate is installed on the side of the upper connecting seat away from the connecting plate by screws, and its surface facing the upper connecting seat is in contact with both the side wall of the upper connecting seat and the side wall of the lower connecting seat. Typically, two limiting plates are symmetrically arranged on both sides of the functional hole. Detachable assembly with the upper connecting seat is achieved through preset mounting holes, facilitating the replacement, maintenance, and repair of the limiting plate and connecting plate. During measurement, the limiting plate is in contact with the lower connecting seat, restricting the upper connecting seat from rotating only with the micrometer screw's axial up-and-down movement.

[0034] This invention uses an upper connecting seat to fix the position of a steel rod and the micrometer screw of a micrometer, and a lower connecting seat to fix two steel rods at the lower end of the micrometer frame. In use, the micrometer opening is enlarged, the threaded part of part 19 is placed on the steel rod at the lower connecting seat, the micrometer opening is reduced, and the thread is squeezed between the upper and lower steel rods, so that the steel rod is in close contact with the thread teeth and the measuring anvil of the micrometer. The micrometer reading is the measured thread pitch diameter.

[0035] This invention is easy to operate, has high measurement efficiency, and is highly versatile. It is suitable for inspecting small batches of various types of threaded parts. It can measure any structural parts with the same thread pitch. By changing the upper and lower connecting seats, it can also measure parts with different thread pitches.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal device for detecting the pitch diameter of external threads, characterized in that: The device includes an upper connecting seat and a lower connecting seat installed at the lower end of the micrometer frame. The upper connecting seat has a connecting plate with a through hole and a connecting ring at the corresponding position of the hollow hole. The inner side of the connecting ring has a mating hole for sliding engagement with the micrometer measuring screw. A limiting plate is provided between the upper and lower connecting seats. The upper connecting seat has an upper groove on the side facing the lower connecting seat and an upper steel bar passing through the upper groove. The lower connecting seat has a lower groove on the side facing the upper connecting seat and an upper steel bar passing through the lower groove. Both the upper and lower connecting seats have functional holes corresponding to the mating holes.

2. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The through hole and the mating hole are arranged coaxially.

3. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The lower connecting seat is provided with two connecting ears on the side away from the upper connecting seat. The two connecting ears are provided with corresponding connecting holes, and a frame fitting space is formed between the two connecting ears.

4. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The upper connecting seat is provided with an upper steel bar, which is perpendicular to the axis of the mating hole.

5. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The lower connecting seat is provided with two lower steel bars, which are arranged in parallel and are perpendicular to the axis of the mating hole.

6. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The connecting plate is L-shaped, with the connecting ring fixed at one end and the other end connected to the upper connecting seat.

7. The universal external thread pitch diameter detection device according to claim 6, characterized in that: The connecting plate is fixed to the upper connecting seat by screws.

8. The universal external thread pitch diameter detection device according to claim 1, characterized in that: The limiting plate is installed on the side of the upper connecting seat away from the connecting plate by screws, and its surface facing the upper connecting seat is in contact with the side wall of the upper connecting seat and the side wall of the lower connecting seat.

9. A universal external thread pitch diameter detection device according to claim 1, characterized in that: The inner diameter of the functional hole is the same as that of the mating hole.

10. A universal external thread pitch diameter detection device according to claim 1, characterized in that: The inner diameter of the through hole is greater than or equal to the inner diameter of the mating hole.

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