Stepped inner hole testing fixture
By designing the step inner hole test test tool and using the threaded connection between the nut and the moving rod, the precise measurement of the inner hole with small holes at both ends and large holes at the inner holes is achieved, solving the problem of detection difficulties in the prior art, making the operation simple and high accuracy.
Patent Information
- Application Number
- CN202422345401.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The prior art is difficult to effectively detect inner holes with small or large internal holes at both ends.
A step inner hole test test tool is designed, through the threaded connection between the nut and the moving rod, the right measuring arm and the left measuring arm are driven to open or close simultaneously, and the inner hole diameter measurement is achieved by combining the scale mark.
The inner hole measurement operation is simplified, and the detection accuracy and convenience of inner holes with small holes at both ends and large holes at the inner holes are improved.
Smart Images
Figure CN223138557U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hole measuring tools, in particular to a stepped inner hole testing fixture. Background Art
[0002] At present, the known inner hole measuring tools include vernier calipers, internal dial gauges, pneumatic gauges, coordinate measuring machines, etc. However, for inner holes with small hole openings at both ends and large hole openings inside, it is relatively difficult to detect, and even impossible to detect. Content of the Utility Model
[0003] (1) Technical Problem to be Solved
[0004] Aiming at the deficiencies of the prior art, the utility model provides a stepped inner hole testing fixture, which solves the problem that it is inconvenient to detect inner holes with small hole openings at both ends and large hole openings inside in the prior art.
[0005] (2) Technical Solution
[0006] To achieve the above purposes, the utility model is realized through the following technical solutions: A stepped inner hole testing fixture includes a fixture body. A moving rod is movably and penetratingly connected to the fixture body. The lower end of the fixture body is respectively rotatably connected to a right measuring arm and a left measuring arm. The lower end of the moving rod is movably connected to the upper ends of the right measuring arm and the left measuring arm. A scale mark is arranged on the fixture body, and a scale portion matching the scale mark is arranged on the moving rod. A nut is movably embedded in the fixture body, and the upper part of the moving rod is threadedly connected to the nut. When the nut is rotated to drive the moving rod to move upward, the right measuring arm and the left measuring arm are synchronously retracted; when the moving rod is driven to move downward, the right measuring arm and the left measuring arm are synchronously opened.
[0007] Preferably, a nut groove is arranged on the fixture body, the nut is movably arranged in the nut groove, the lower part of the fixture body is rotatably connected to the right measuring arm and the left measuring arm through a limit pin hole and a hinge pin, and a measuring arm groove is arranged at the lower part of the fixture body.
[0008] Preferably, the nut includes an outer shell body and a threaded body. The threaded body is installed in the inner cavity of the outer shell body by spring extrusion, and threads are arranged on the inner surface of the threaded body.
[0009] Preferably, a sliding groove is arranged at the upper part of the right measuring arm, a pin hole is arranged in the middle of the right measuring arm, a measuring ball head is fixedly arranged at the lower part of the right measuring arm, the left measuring arm is arranged symmetrically to the right measuring arm in a mirror image manner, and the hinge pin passes through the pin holes on the right measuring arm and the left measuring arm for cooperation.
[0010] Preferably, a central hole is arranged through the middle of the inspection body, the moving rod is movably arranged in the central hole, a threaded portion is arranged on the upper portion of the moving rod, the threaded portion is in threaded connection with the nut, and the lower end of the moving rod is movably connected to the sliding grooves on the right measuring arm and the left measuring arm through a cylindrical pin.
[0011] (III) Advantageous Effects
[0012] The utility model has the following advantageous effects:
[0013] For this stepped inner hole testing jig, through the arranged nut and moving rod, the threaded fit between the nut and the moving rod can be utilized to rotate the nut to make the moving rod move downward, thereby driving the lower ends of the right measuring arm and the left measuring arm to open synchronously and then contact with the hole wall of the stepped inner hole; through the arranged scale marks and marking portions, the distance that the moving rod moves downward can be converted to know the distance that the two measuring arms open at this time, and then the aperture of the stepped inner hole can be known. By setting the pre-calculated value as the scale marks, personnel can directly read the scale on the scale marks during use to know the aperture size of the stepped inner hole at this time. The overall operation is simple, the structural design is simple, and it is beneficial to promote the use. Description of the Drawings
[0014] Figure 1 is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 is a schematic diagram of the inspection body structure of the utility model;
[0016] Figure 3 is a schematic diagram of the partial cross-section structure of the nut of the utility model;
[0017] Figure 4 is a schematic diagram of the right measuring arm structure of the utility model;
[0018] Figure 5 is a schematic diagram of the moving rod structure of the utility model.
[0019] In the figure: 1. Inspection body; 11. Nut groove; 12. Scale marks; 13. Limit pin hole; 14. Central hole; 15. Measuring arm groove; 2. Nut; 21. Threaded body; 22. Spring; 23. Outer housing; 24. Thread; 3. Right measuring arm; 31. Sliding groove; 32. Pin hole; 33. Measuring ball head; 4. Left measuring arm; 5. Hinge pin; 6. Cylindrical pin; 7. Moving rod; 71. Threaded portion; 72. Scale portion. Detailed Embodiments
[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] Please refer to Figure 1 , the present invention provides a technical solution: a stepped inner hole test fixture, including a fixture body 1, a moving rod 7 is movably and penetratingly connected to the fixture body 1, the lower end of the fixture body 1 is respectively rotatably connected to a right measuring arm 3 and a left measuring arm 4, the lower end of the moving rod 7 is movably connected to the upper ends of the right measuring arm 3 and the left measuring arm 4, a scale mark 12 is provided on the fixture body 1, and a scale portion 72 matching the scale mark 12 is provided on the moving rod 7. A nut 2 is movably embedded in the fixture body 1, and the upper part of the moving rod is threadedly connected to the nut 2 by a thread 24. When the nut 2 is rotated to drive the moving rod 7 to move upward, the right measuring arm 3 and the left measuring arm 4 are synchronously closed; when driving the moving rod 7 to move downward, the right measuring arm 3 and the left measuring arm 4 are synchronously opened.
[0022] In the present invention, by providing the nut 2 and the moving rod 7, the threaded 24 cooperation between the nut 2 and the moving rod 7 can be utilized, so that when the nut 2 is rotated, the moving rod 7 moves downward, thereby driving the lower ends of the right measuring arm 3 and the left measuring arm 4 to open synchronously, and then contacting the inner wall of the stepped inner hole; by providing the scale mark 12 and the marking portion, the distance that the moving rod 7 moves downward can be converted to know the distance that the two measuring arms open at this time, and then the aperture of the stepped inner hole at this time can be known. By setting the pre-calculated value as the scale mark 12, personnel can directly read the scale on the scale mark 12 during use to know the aperture size of the stepped inner hole at this time. The overall operation is simple, the structural design is simple, and it is conducive to popularization and use.
[0023] Referring to Figure 2 As shown, in this embodiment, a nut groove 11 is provided on the fixture body 1, the nut 2 is movably arranged in the nut groove 11, the lower part of the fixture body 1 is rotatably connected to the right measuring arm 3 and the left measuring arm 4 through a limit pin hole 13 and a hinge pin 5, and a measuring arm groove 15 is arranged at the lower part of the fixture body 1. By providing the nut groove 11, after the lower ends of the two measuring arms extend into the stepped inner hole, it is convenient for personnel to rotate the nut 2 located in the groove, and the moving rod 7 moves downward to drive the measuring arms to open, thereby realizing the measurement of the inner hole aperture.
[0024] Referring to Figure 3As shown, in this embodiment, the nut 2 includes a housing 23 and a threaded body 21. The threaded body 21 is press-fitted into the inner cavity of the housing 23 by a spring 22, and a thread 24 is arranged on the inner surface of the threaded body 21. By using the threaded body 21 press-fitted by the spring 22, when a person rotates the housing 23 to drive the moving rod 7 to continuously push the right measuring arm 3 and the left measuring arm 4 to open until they contact the wall of the inner hole, and then rotates the housing 23 again, slipping will occur between the housing 23 and the threaded body 21, and no torque is applied to the threaded body 21 by the housing 23. At this time, the aperture size of the inner hole can be read according to the scale mark 12. In this way of press-fitting by the spring 22, it can effectively prevent excessive rotation of the housing 23 from affecting the service life of the thread 24 connection between the threaded body 21 and the moving rod 7.
[0025] Refer to Figure 1 And 3 As shown, in this embodiment, a sliding groove 31 is provided in the upper part of the right measuring arm 3, a pin hole 32 is provided in the middle of the right measuring arm 3, a measuring ball head 33 is fixedly provided at the lower part of the right measuring arm 3, and the left measuring arm 4 is arranged symmetrically with the right measuring arm 3 in a mirror image, and the hinge pin 5 passes through the pin holes 32 on the right measuring arm 3 and the left measuring arm 4 for cooperation. By providing the sliding groove 31, it is convenient for the moving rod 7 to push the measuring arms to expand and contract; by arranging the measuring ball head 33 at the lower end of the measuring arm, it is easier to measure the maximum hole position and reduce the measurement error.
[0026] In this embodiment, a central hole 14 is arranged through the middle of the inspection body 1, the moving rod 7 is movably arranged in the central hole 14, a threaded portion 71 is provided at the upper part of the moving rod 7, and the threaded portion 71 is threadedly connected with the nut 2, and the lower end of the moving rod 7 is movably connected with the sliding grooves 31 on the right measuring arm 3 and the left measuring arm 4 through a cylindrical pin 6.
[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation. An element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.
[0028] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A stepped inner hole test fixture, comprising a fixture body, characterized in that: The inspection body is movably and integrally connected with a movable rod. The lower ends of the inspection body are respectively rotatably connected with a right measuring arm and a left measuring arm. The lower end of the movable rod is movably connected with the upper ends of the right measuring arm and the left measuring arm. A scale mark is arranged on the inspection body, and a scale portion matching the scale mark is arranged on the movable rod. A nut is movably embedded in the inspection body, and the upper part of the movable rod is threadedly connected with the nut. When the nut is rotated to drive the movable rod to move upward, the right measuring arm and the left measuring arm are synchronously closed; when the movable rod is driven to move downward, the right measuring arm and the left measuring arm are synchronously opened.
2. The step inner hole test fixture according to claim 1, characterized in that: A nut groove is arranged on the inspection body, and the nut is movably arranged in the nut groove. The lower part of the inspection body is rotatably connected with the right measuring arm and the left measuring arm through a limit pin hole and a hinge pin, and a measuring arm groove is arranged at the lower part of the inspection body.
3. The step inner hole test fixture according to claim 1 or 2, characterized in that: The nut includes a housing body and a threaded body. The threaded body is installed in the inner cavity of the housing body by spring extrusion, and threads are arranged on the inner surface of the threaded body.
4. A stepped inner hole test fixture according to claim 2, characterized in that: A sliding groove is arranged at the upper part of the right measuring arm, a pin hole is arranged in the middle of the right measuring arm, and a measuring ball head is fixedly arranged at the lower part of the right measuring arm. The left measuring arm is arranged symmetrically with the right measuring arm in a mirror image, and the hinge pin passes through the pin holes on the right measuring arm and the left measuring arm for cooperation.
5. The step inner hole test fixture according to claim 4, characterized in that: A central hole is arranged through the middle of the inspection body, and the movable rod is movably arranged in the central hole. A threaded portion is arranged at the upper part of the movable rod, and the threaded portion is threadedly connected with the nut. The lower end of the movable rod is movably connected with the sliding grooves on the right measuring arm and the left measuring arm through a cylindrical pin.