Jumping testing fixture for nut

Abstract

The utility model relates to a nut run-out testing fixture, which comprises a positioning core, a deflection instrument and a dial indicator, and is characterized in that the positioning core is used for positioning a to-be-tested nut, the two ends of the positioning core are provided with center holes matched with the deflection instrument, the deflection instrument is used for supporting the positioning core and allowing the positioning core to rotate, and the dial indicator is used for measuring the run-out of the to-be-tested nut. The dial indicator is arranged on one side of the deflection instrument, and a pointer of the dial indicator is used for abutting against the end face of the nut to be measured. The method has the effects of shortening the detection time and reducing the detection error.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of nut detection, and in particular to a nut run-out detection tool. BACKGROUND

[0002] In the nut manufacturing field, end face run-out detection is an important quality control link. In modern manufacturing, precision machinery and high-end equipment have increasingly high quality requirements for parts, especially for nuts, a kind of key fastener, the accuracy and stability of the end face run-out of which directly affect the performance and service life of the entire assembly. Therefore, efficient and accurate run-out detection technology has become an important means to improve product quality and production efficiency.

[0003] The nut end face run-out detection method in the related art mainly includes using a three-coordinate measuring machine to scan. The specific method is to scan the thread crest as a reference first, and then scan the end face to calculate the run-out value. Although this method can provide relatively accurate data, it requires multiple scans of different parts, resulting in a long detection time, which is difficult to meet the real-time detection needs of large-scale production. In addition, in the actual production process, the thread and the crest are often not processed in the same process, which makes the measurement based on the crest have certain errors, affecting the accuracy of the final detection result. CONTENT OF THE UTILITY MODEL

[0004] In order to shorten the detection time and reduce the detection error, the application provides a nut run-out detection tool.

[0005] The nut run-out detection tool provided by the application adopts the following technical solution:

[0006] A nut run-out detection tool, comprising a positioning core, a run-out instrument and a dial gauge, the positioning core is used for positioning a nut to be measured, both ends of the positioning core are provided with a center hole for cooperating with the run-out instrument, the run-out instrument is used for supporting the positioning core and allowing it to rotate, the dial gauge is arranged on one side of the run-out instrument, and a pointer of the dial gauge is used for abutting against an end face of the nut to be measured.

[0007] By adopting the above technical solution, efficient and accurate detection of the nut end face circle run-out is realized. The design of the positioning core enables the nut to be measured to be stably fixed thereon, reducing the shaking in the measurement process and thereby improving the detection accuracy. The combination of the run-out instrument and the dial gauge not only simplifies the detection process, improves the detection speed and is suitable for large-scale detection, but also avoids the error caused by reference conversion in the three-coordinate measuring machine scanning method, and further reduces the detection cost.

[0008] Optionally, the positioning core comprises a threaded shaft, and a tapered thread is arranged on the outer side wall of the threaded shaft.

[0009] By adopting the technical scheme, the nut can be directly screwed on the positioning core with the tapered thread, ensuring the close contact between the nut and the positioning core, the tapered thread design can better simulate the stress condition in actual use, and the detection accuracy and reliability are further improved.

[0010] Optionally, the taper of the tapered thread is 0.3:100.

[0011] By adopting the technical scheme, the cooperation between the positioning core and the nut is more close, effectively reducing the measurement error caused by poor thread contact, thereby further improving the detection accuracy. At the same time, the specific taper design ensures that the nut can be uniformly stressed during the screwing process, avoiding deformation caused by local stress concentration.

[0012] Optionally, the side with wider outer diameter of the tapered thread is provided with an outer edge.

[0013] By adopting the technical scheme, the outer edge can prevent the nut from slipping during the screwing process, ensuring the stability of the measurement process, and on the other hand, it is also convenient for the staff to control, by applying force through the outer edge, the threaded shaft can drive the nut to rotate around its axis, thereby facilitating the detection of the end face circle runout of the nut by the dial gauge.

[0014] Optionally, the side away from the threaded shaft of the outer edge is fixedly provided with an inner hexagonal sleeve for cooperating with the torque wrench.

[0015] By adopting the technical scheme, stable and uniform torque can be applied by the torque wrench during installation, ensuring that different nuts can be fixed on the positioning core with the same torque, thereby reducing the measurement error caused by different cooperation torque of the nut and the positioning core.

[0016] Optionally, one of the tailstock holes is located at the end of the threaded shaft away from the outer edge, the other is located at the end of the outer edge away from the threaded shaft, and is located at the end of the inner hexagonal sleeve close to the outer edge, and the tailstock hole is coaxially arranged with the threaded shaft.

[0017] By adopting the technical scheme, not only the accurate installation and stable rotation of the positioning core on the dial gauge are ensured, but also the measurement error caused by position deviation is effectively reduced, further improving the accuracy of the detection result. At the same time, such design makes the operation of the whole gauge more simple, improving the work efficiency.

[0018] Optionally, the positioning core comprises an inner expanding expansion sleeve, and the tailstock hole is coaxially arranged with the inner expanding expansion sleeve.

[0019] By adopting the above technical scheme, the positioning core of the inner expansion type expansion sleeve type makes the nut more stable during installation, the design adopts the existing structure, reduces the manufacturing cost, and is convenient for maintenance and replacement.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. Convenient and fast detection: by installing the nut on the threaded mandrel with taper and using the torque wrench to apply the fixed torque, the nut is fixed on the mandrel, avoiding radial shaking. This design simplifies the detection process, reduces the influence of human factors, and significantly improves the detection speed and efficiency;

[0022] 2. High detection accuracy: using the tapered threaded mandrel, the deflection instrument and the dial gauge, the runout value of the nut end face can be directly measured without the help of other indirect references, thereby eliminating the positioning error caused by the addendum;

[0023] 3. Meet the actual use requirements: by simulating the stress state of the nut in the actual use process, the detection result is closer to the real working condition, thereby better meeting the actual needs of production and quality control. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the runout gauge of the nut provided by the embodiment 1 of the present application.

[0025] Figure 2 is a structural schematic diagram of the positioning core provided by the embodiment 1 of the present application.

[0026] Figure 3 is a structural schematic diagram of the positioning core provided by the embodiment 1 of the present application.

[0027] Explanation of reference signs: 1-deflection instrument; 2-dial gauge; 3-positioning core; 301-threaded shaft; 302-outer edge; 303-internal hexagonal sleeve; 304-center hole. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the accompanying Figures 1-3 The present application will be further described in detail.

[0029] Embodiment 1

[0030] The embodiment of the present application discloses a runout gauge of a nut.

[0031] As Figure 1As shown, the run-out gauge of the nut comprises a positioning core 3, a runout instrument 1 and a dial gauge 2. Among them, the positioning core 3 is used to position the nut to be measured, and the two ends of the positioning core 3 are provided with a center hole 304 for cooperation with the runout instrument 1, the runout instrument 1 is used to support the positioning core 3 and allow it to rotate, and the dial gauge 2 is arranged on one side of the runout instrument 1, and the pointer of the dial gauge 2 is used to abut against the end face of the nut to be measured. The technical scheme rotates the nut to be measured with the center pin of the runout instrument 1 as the center axis, and in the rotation process of the nut to be measured, the dial gauge 2 measures the run-out value of the end face of the nut, thereby realizing high-precision and high-efficiency detection effect.

[0032] As shown in Figure 2 and Figure 3 Specifically, the positioning core 3 comprises a threaded shaft 301, and the outer side wall of the threaded shaft 301 is provided with a tapered thread. Here, the tapered thread is designed to better adapt to the nut to be measured, to ensure that the nut can be closely fitted during installation, and to reduce measurement errors. For example, the tapered thread can adopt a standard taper of 0.3:100, and the tightness of the threaded pair can be ensured by using the tapered thread. The wider side of the tapered thread is provided with an outer edge 302, which can prevent the nut from slipping during tightening and ensure the stability of the measurement process, and also facilitates the control of the staff. By applying force through the outer edge 302, the threaded shaft 301 can drive the nut to rotate around its own axis, thereby facilitating the detection of the roundness run-out of the nut end face by the dial gauge 2. The inner hexagonal sleeve 303 for cooperation with the torque wrench is fixedly arranged on the side of the outer edge 302 away from the threaded shaft 301, so that a constant torque can be applied by the torque wrench, ensuring that different nuts can be fixed on the positioning core 3 with the same torque, thereby reducing the measurement error caused by the different torque of the nut and the positioning core 3.

[0033] One of the center holes 304 is located at the end of the threaded shaft 301 away from the outer edge 302, the other is located at the end of the outer edge 302 away from the threaded shaft 301, and is located at the end of the inner hexagonal sleeve 303 close to the outer edge 302, and the center hole 304 is coaxially arranged with the threaded shaft 301. Such design ensures the stability and concentricity of the positioning core 3 on the runout instrument 1, making the measurement result more accurate and reliable.

[0034] The implementation principle of the embodiment is:

[0035] By installing the nut on the positioning core 3 with tapered thread and using the torque wrench to apply a constant torque, the nut is completely fixed on the positioning core 3, and then it is installed on the runout instrument 1 for rotation, and the run-out value of the nut end face is read by the dial gauge 2. This method not only simplifies the operation process, but also significantly improves the detection accuracy and efficiency. Compared with the traditional three-coordinate measurement method, this scheme does not need to scan different parts for many times, greatly shortens the detection time, and is suitable for real-time detection demand in large-scale production environment.

[0036] Embodiment 2

[0037] The difference between this embodiment and the above-mentioned embodiments is that the positioning core 3 adopts an inner expanding sleeve instead of a taper thread design. This design is mainly suitable for the detection of thick-wall nuts, because the inner expanding sleeve may cause deformation of thin-wall nuts when positioning the nuts to be measured by expansion, thereby causing measurement errors.

[0038] Specifically, the outer shape of the inner expanding sleeve is usually cylindrical, and a plurality of expansion blocks are arranged in the circumferential direction inside the sleeve. These expansion blocks can move outward under the action of external pressure to form an annular contact surface, effectively fixing the nut. The two ends of the sleeve are provided with a center hole 304 for cooperation with the dial indicator 1, and the center hole 304 is coaxially arranged with the internal expansion blocks, ensuring the stability and concentricity of the positioning core 3 on the dial indicator 1.

[0039] The implementation principle of this embodiment is:

[0040] By inserting the nut into the inner expanding sleeve and applying appropriate external pressure, the expansion blocks inside the sleeve expand outward, thereby tightly fixing the nut. Subsequently, the sleeve is installed on the dial indicator 1 for rotation, and the run-out value of the end face of the nut is read by the dial indicator 2. This method is particularly suitable for the detection of thick-wall nuts, which not only ensures the measurement accuracy, but also avoids damage to the nut. Compared with the traditional method, the present scheme not only has simple operation, but also can effectively reduce the measurement error and improve the production efficiency.

[0041] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A runout gauge for nuts, used to detect the circular runout of the nut end face, characterized in that, include: The positioning core (3), the runout gauge (1), and the dial indicator (2) are provided. The positioning core (3) is used to position the nut to be tested. The two ends of the positioning core (3) are provided with top holes (304) for cooperating with the runout gauge (1). The runout gauge (1) is used to support the positioning core (3) and allow it to rotate. The dial indicator (2) is located on one side of the runout gauge (1). The pointer of the dial indicator (2) is used to abut the end face of the nut to be tested.

2. The nut runout gauge according to claim 1, characterized in that, The positioning core (3) includes a threaded shaft (301), and the outer side wall of the threaded shaft (301) is provided with a tapered thread.

3. The nut runout gauge according to claim 2, characterized in that, The taper of the tapered thread is 0.3:

100.

4. The nut runout gauge according to claim 2, characterized in that, The tapered thread has an outer edge (302) on the side with a wider outer diameter.

5. The nut runout gauge according to claim 4, characterized in that, An internal hexagon socket (303) for cooperating with a torque wrench is fixedly provided on the side of the outer edge (302) away from the threaded shaft (301).

6. The nut runout gauge according to claim 5, characterized in that, One of the top holes (304) is located at the end of the threaded shaft (301) away from the outer edge (302), and the other is located at the end of the outer edge (302) away from the threaded shaft (301) and at the end of the internal hexagonal sleeve (303) close to the outer edge (302). The top holes (304) are coaxially arranged with the threaded shaft (301).

7. The nut runout gauge according to claim 1, characterized in that, The positioning core (3) includes an inner expansion sleeve, and the top hole (304) is coaxially arranged with the inner expansion sleeve.

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