A checking tool for quickly checking the pitch of threaded holes in parts

Abstract

The present invention relates to a gauge for quickly detecting the hole spacing of threaded holes on parts, which is used to detect the hole spacing of several threaded holes to be measured processed on the inner annular end surface of the part, wherein the threaded holes to be measured are located on the same circumference line. The gauge includes a positioning plate, a contact displacement measuring part, a detection screw and a positioning screw. The positioning plate is processed with detection holes corresponding to the positions of the threaded holes to be measured of the standard part. During detection, the positioning screws respectively pass through the detection holes and are fixedly connected to the threaded holes to be measured. The detection screws are fixed on the positioning plate, and the contact displacement measuring part is fixedly suspended above the positioning plate, and the probe of the contact displacement measuring part always keeps in contact with the detection screws. Compared with the prior art, the present invention does not need to use the assistance of three coordinates, and only needs to use a dial indicator or the like for rapid detection. The method is simple and easy to implement, and is suitable for rapid batch detection.

Description

Technical Field

[0001] The invention belongs to the technical field of hole pitch detection and relates to a checking tool for quickly detecting the hole pitch of threaded holes of a part. Background Art

[0002] At present, due to the inaccurate measurement data of threaded hole pitch, the long detection time and low detection efficiency, many products are repeatedly aligned during the assembly process, which seriously affects the assembly efficiency and product quality. Figure 5 The workpiece being tested as shown has 6-M8 threaded holes machined on the inner annular end face, and the hole distance cannot be measured directly. After measuring the data in two directions of each threaded hole of each piece, the actual hole distance is calculated and compared with the standard to determine whether it is qualified. In this way, it takes a long time to inspect several pieces at a time, and the inspection efficiency is very low. Moreover, every time faced with this problem, the inspector can only conduct random inspections and cannot achieve completely accurate inspections. Summary of the invention

[0003] The purpose of the present invention is to provide a checking tool for quickly checking the hole pitch of threaded holes of parts.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A gauge for quickly detecting the hole pitch of threaded holes on a part is used to detect the hole pitch of a plurality of threaded holes to be measured processed on the inner annular end surface of the part, wherein the threaded holes to be measured are located on the same circumference line. The gauge comprises a positioning plate, a contact displacement measuring piece, a detection screw and a positioning screw. The positioning plate is processed with detection holes corresponding to the positions of the threaded holes to be measured of the standard part. During detection, the positioning screws respectively pass through the detection holes and are fixedly connected to the threaded holes to be measured. The detection screws are fixed on the positioning plate, and the detection screws and the positioning screws are both located on the circumference line where the threaded holes to be measured are located. The contact displacement measuring piece is fixedly suspended above the positioning plate, and the probe of the contact displacement measuring piece always keeps in contact with the detection screw.

[0006] Furthermore, there is a matching gap between the inner wall of the detection hole and the positioning screw.

[0007] Furthermore, the positioning plate is tightly fitted with the outer circle of the inner annular end surface of the part.

[0008] Furthermore, a meter frame can be detachably mounted on the side of the part, and the free end of the meter frame extends to the side of the detection screw above the positioning plate, and the contact displacement measuring part is fixedly mounted on the free end of the meter frame.

[0009] Furthermore, the meter stand is a magnetic meter stand, which is fixed on the part by magnetic adsorption.

[0010] Furthermore, the positioning screw is a two-stage variable diameter screw.

[0011] Furthermore, the number of the threaded holes to be tested is six.

[0012] Furthermore, the detection screw is fixed on the positioning plate by screwing.

[0013] Furthermore, the threaded holes to be measured are arranged at equal intervals.

[0014] Furthermore, the contact displacement measuring component is a dial indicator.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) Low cost of inspection tools: Inspection tools are simple in design and easy to make. The processing does not require much cost and is both time-saving and labor-saving.

[0017] (2) Easy to use: The invention does not require the inspector to have a high skill level, and the inspector can complete the inspection independently by mastering general skills.

[0018] (3) Efficiency improvement: The present invention greatly improves the inspection time of similar products.

[0019] (4) Long life of the gauge: This gauge is made of medium carbon steel that has been tempered and ground on all sides to ensure a certain hardness and good surface roughness. It has very little wear and tear during use, thus having an extremely long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a top view schematic diagram of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of CC cross-section;

[0023] Figure 4 It is a schematic diagram of the detection hole of the positioning plate;

[0024] Figure 5 is a schematic diagram of the part to be tested;

[0025] Description of the markings in the figure:

[0026] 1- positioning plate, 2- dial indicator, 3- detection screw, 4- positioning screw, 5- detection hole, 6- measured part, 7- measured threaded hole. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] In the following embodiments, unless otherwise specified, functional components or structures are conventional components or structures in the art for realizing corresponding functions.

[0029] Embodiment 1:

[0030] This embodiment provides a fast detection of threaded hole pitch on a part. Figure 1 As shown, it is used to implement Figure 5 The hole spacing of several threaded holes 7 to be measured processed on the inner annular end face of the measured part 6 shown in the figure is detected. The threaded holes 7 to be measured are located on the same circumference line. The inspection fixture includes a positioning plate 1, a contact displacement measuring piece, a detection screw 3 and a positioning screw 4. The positioning plate 1 is processed with detection holes 5 corresponding to the positions of the threaded holes 7 to be measured of the standard part. During the inspection, the positioning screws 4 pass through the detection and are fixedly connected to the threaded holes 7 to be measured. The detection screw 3 is fixed on the positioning plate 1, and the detection screw 3 and the positioning screw 4 are both located on the circumference line where the threaded holes 7 to be measured are located. The contact displacement measuring piece is fixedly suspended above the positioning plate 1, and the probe of the contact displacement measuring piece always keeps in contact with the detection screw 3.

[0031] See also Figure 4 As shown, there is a matching clearance between the inner wall of the detection hole 5 and the positioning screw 4, which can ensure the smooth passage of the positioning screw 4. At the same time, the matching clearance can also be used to realize the back and forth rotation of the positioning plate 1, thereby realizing indirect measurement of the hole pitch tolerance of the threaded hole 7 to be measured.

[0032] At the same time, preferably, the positioning plate 1 is tightly fitted with the outer circle of the inner annular end surface of the part.

[0033] Please see again Figures 1 to 3 As shown in FIG. 1 , a meter frame can be detachably mounted on the side of the part, and the free end of the meter frame extends to the side of the detection screw 3 above the positioning plate 1, and a contact displacement measuring part is fixedly arranged on the free end of the meter frame. The meter frame is a magnetic meter frame, which is fixed on the part by magnetic adsorption.

[0034] Furthermore, the positioning screw 4 is a variable diameter screw and can adopt a two-section structure, that is, the lower section is matched and fixed with the threaded hole 7 to be tested, and the upper section can ensure that there is a matching gap between the detection hole 5.

[0035] Please see again Figure 1As shown in the figure, there are six threaded holes 7 to be tested. Further, the detection screw 3 can be fixed on the positioning plate 1 by screwing. The threaded holes 7 to be tested are arranged at equal intervals. The contact displacement measuring part is a dial indicator 2.

[0036] When doing specific work, Figure 5 The part to be tested 6 shown in the figure has the positioning screw 4 screwed into the 6-M8 threaded hole of the part to be tested. The end face of the positioning screw 4 is required to be close to the end face of the part to ensure that the precision detection is not inaccurate due to looseness during detection. Then the positioning disk 1 is installed on the outer circle of the part positioned with a size of Φ90h7, and at the same time, the 6 detection holes 5 of the positioning disk 1 are aligned with the 6 positioning screws 4, so that they can smoothly enter the positioning disk 1, and the detection screws 3 are screwed on. Finally, the magnetic base with the dial indicator 2 is sucked on the side of the part to be tested, and the probe of the dial indicator 2 is allowed to contact the detection screws 3. In this way, the positioning disk 1 can be rotated to reflect the fitting clearance between the detection hole 5 of the positioning disk 1 and the positioning screw 4. At the same time, the detection screw 3 is screwed on the positioning disk 1 to ensure that it is integrated with the positioning disk 1. The fitting clearance is reflected on the dial indicator 2 through the detection screw 3, and the shape and position tolerance of the measured threaded hole 7 of the part to be tested 6 is judged by the indicated value.

[0037] For example, the position tolerance of the inspected part is Φ0.2, and the M8 positioning screw 4 is used. The size of the upper part of the positioning screw 4 and the matching part of the positioning plate 1 is Φ11.6h7, and the detection hole 5 on the positioning plate 1 is Φ12H7, then the matching clearance is 0.4mm. Considering the actual tolerance of the threaded hole 7 to be tested, the matching clearance is 0.2mm when the tolerance is the largest, and the matching clearance is 0.4mm when the tolerance is the smallest. Therefore, when the positioning plate 1 rotates forward and backward during the test, the difference in the indication of the dial indicator 2 is within 0.2~0.4mm, which is qualified. After actual use, the effect is very good. At the same time, considering the efficiency, several more sets of positioning screws 4 are made, and the positioning screws 4 are screwed on the parts 6 to be tested with pneumatic wrenches. In this way, it only takes a short time to complete the inspection of each piece, which greatly shortens the inspection time.

[0038] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A test fixture for quickly testing the pitch of threaded holes on a part, used to test the pitch of a plurality of threaded holes to be tested processed on the inner annular end surface of the part, wherein the threaded holes to be tested are located on the same circumference line, and characterized in that: The inspection tool comprises a positioning plate, a contact displacement measuring piece, a detection screw and a positioning screw. The positioning plate is processed with detection holes corresponding to the positions of the threaded holes to be measured of the standard parts. During the inspection, the positioning screws pass through the detection holes respectively and are fixedly connected to the threaded holes to be measured. The detection screws are fixed on the positioning plate, and the detection screws and the positioning screws are both located on the circumference of the threaded holes to be measured. The contact displacement measuring piece is fixedly suspended above the positioning plate, and the probe of the contact displacement measuring piece always keeps in contact with the detection screws. There is a matching gap between the inner wall of the detection hole and the positioning screw; The positioning plate is tightly fitted with the outer circle of the inner annular end surface of the part; A meter frame can be detachably mounted on the side of the part, the free end of which extends to the side of the detection screw above the positioning plate, and the contact displacement measuring part is fixedly arranged on the free end of the meter frame.

2. A fast inspection tool for detecting the pitch of threaded holes on parts according to claim 1, characterized in that: The meter frame is a magnetic meter frame, which is fixed on the parts by magnetic adsorption.

3. A checking fixture for quickly checking the pitch of threaded holes on parts according to claim 1, characterized in that: The positioning screw is a two-stage variable diameter screw.

4. A checking fixture for quickly checking the pitch of threaded holes on parts according to claim 1, characterized in that: There are six threaded holes to be tested.

5. A checking fixture for quickly checking the pitch of threaded holes on parts according to claim 1, characterized in that: The detection screw is fixed on the positioning plate by screwing.

6. A checking fixture for quickly checking the pitch of threaded holes on parts according to claim 1, characterized in that: The threaded holes to be measured are arranged at equal intervals.

7. A checking fixture for quickly checking the pitch of threaded holes on parts according to claim 1, characterized in that: The contact type displacement measuring component is a dial indicator.

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