Detection tool for detecting symmetry degree of part

Abstract

The utility model discloses a testing fixture for detecting the degree of symmetry of a part, and relates to the technical field of detecting the degree of symmetry of the part, a first counter bore, a second counter bore, a third counter bore and a fourth counter bore are sequentially formed in a base from top to bottom, the diameters of the first counter bore, the second counter bore, the third counter bore and the fourth counter bore are sequentially reduced, and an annular gasket matched with the first counter bore is fixedly arranged at the bottom of the first counter bore; the through groove is matched with the outer contour of the part, and four countersunk head grooves penetrating through the outer wall of the base are evenly formed in the annular gasket in the circumferential direction of the annular gasket; a movable plate is installed in a large groove of the countersunk grooves in a sliding mode, a spring is fixedly arranged between the outer end face of the movable plate and the groove bottom of the large groove of the countersunk grooves, the inner end face of the movable plate extends into the through groove, the top surface of the extending end is provided with an inclined face inclining downwards, and dial indicators are fixedly arranged outside small grooves of the four countersunk grooves. The beneficial effects of the utility model are that the detection time of the symmetry degree of the part is greatly shortened, and the detection efficiency of the symmetry degree of the part is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detecting the symmetry of parts, in particular to a checking tool for detecting the symmetry of parts. Background Art

[0002] The structure of a rotating part is as follows Figure 1~Figure 2 As shown, the part 1 is cylindrical, a center hole 2 is opened in the part 1 along its axial direction, and four planes 3 are evenly opened on the outer cylindrical surface of the part 1.

[0003] After a batch of parts 1 are produced in the workshop, the process requires that the symmetry of part 1 be tested, that is, whether the four planes 3 on part 1 are symmetrical to each other [because of the influence of the manufacturing process, one or more planes 3 on part 1 may be tilted outward instead of vertical, causing part 1 to be asymmetrical. Therefore, the symmetry of part 1 needs to be tested].

[0004] The testing methods in the workshop are:

[0005] S1. A worker takes a part 1 from the basket and places it on the inspection table.

[0006] S2. The worker uses a caliper to measure the horizontal distances between the four planes 3 and the axis of part 1. If any one of the four measured horizontal distances exceeds the design range, it indicates that the symmetry of part 1 does not meet the requirements, and part 1 is judged to be unqualified. If all four horizontal distances do not exceed the design range, it indicates that the symmetry of part 1 meets the requirements, and part 1 is judged to be qualified, thus completing the symmetry test of the first part 1.

[0007] S3. The worker repeats steps S1 to S2 multiple times to continuously detect the symmetry of multiple parts 1.

[0008] However, although the method used in the workshop can detect the symmetry of part 1, it still has the following technical defects:

[0009] I. In step S2, a worker needs to use a caliper to measure the horizontal distances between the four planes 3 on the part 1 and the axis of the part 1 to complete the symmetry inspection of the part 1. In the entire inspection process, four steps are required to measure the horizontal distances between the four planes 3 and the axis of the part 1 respectively, which undoubtedly increases the symmetry inspection time of a single part 1 and thus reduces the symmetry inspection efficiency of the part 1.

[0010] II. There are as many as 119 to 150 parts 1 to be inspected every day. Using this inspection method, it takes a long time to complete the inspection of all parts 1, thereby further reducing the inspection efficiency of the symmetry of the parts 1.

[0011] Therefore, there is an urgent need for a testing tool that can greatly shorten the part symmetry detection time and greatly improve the part symmetry detection efficiency. Utility Model Content

[0012] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a part symmetry detection tool which greatly shortens the part symmetry detection time and greatly improves the part symmetry detection efficiency.

[0013] The purpose of the utility model is achieved through the following technical solutions: a checking tool for detecting the symmetry of a part, comprising a base, wherein a first countersunk hole, a second countersunk hole, a third countersunk hole, and a fourth countersunk hole are sequentially provided in the base from top to bottom with successively smaller diameters; an annular washer is fixed on the bottom of the first countersunk hole and matched therewith; a through groove is provided in the annular washer and communicates with the second countersunk hole, the through groove matches the outer contour of the part; and four countersunk grooves are uniformly provided in the annular washer along its circumference and penetrate the outer wall of the base;

[0014] A movable plate is slidably installed in the large groove of the countersunk groove, a spring is fixed between the outer end surface of the movable plate and the bottom of the large groove of the countersunk groove, the inner end surface of the movable plate extends into the through groove, and a downward inclined surface is provided on the top surface of the extended end, and a dial indicator is fixed on the outside of the small grooves of the four countersunk grooves, and the detection rod of the dial indicator passes through the small groove of the countersunk groove and rests on the outer end surface of the movable plate;

[0015] An expansion sleeve extending into the through groove is fixedly provided at the bottom of the second countersunk hole, wherein a tapered hole arranged along its axial direction is provided in the expansion sleeve, and a plurality of openings communicating with the tapered hole are provided on the cylindrical surface of the expansion sleeve along its circumferential direction;

[0016] The bottom of the third countersunk hole is supported by a conical head, the outer conical surface of the conical head matches the conical hole of the expansion sleeve; the base is also provided with a joint connected to the fourth countersunk hole, and the joint is connected to the working port of the air compressor.

[0017] The first countersunk hole, the second countersunk hole, the third countersunk hole, the fourth countersunk hole, the expansion sleeve and the conical head in the base are coaxially arranged.

[0018] The openings on the expansion sleeve are evenly distributed on the expansion sleeve.

[0019] The annular washer is fixed to the bottom of the first countersunk hole via a plurality of locking screws.

[0020] The large groove of the countersunk groove is a rectangular groove, and the small groove of the countersunk groove is a circular hole.

[0021] The utility model has the following advantages: greatly shortening the part symmetry detection time and greatly improving the part symmetry detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the parts;

[0023] Figure 2 for Figure 1 The main cross-sectional diagram of

[0024] Figure 3 It is a structural diagram of the utility model;

[0025] Figure 4 for Figure 3 A top view of

[0026] Figure 5 for Figure 4 AA cross-sectional view;

[0027] Figure 6 is a structural diagram of the base;

[0028] Figure 7 for Figure 6 The main cross-sectional diagram of

[0029] Figure 8 It is an axonometric view of the ring gasket;

[0030] Figure 9 This is the axonometric drawing of the movable panel;

[0031] Figure 10 This is the axonometric drawing of the expansion sleeve;

[0032] Figure 11 This is the axonometric view of the conical head;

[0033] Figure 12 This is a schematic diagram of putting the center hole of the part on the outside of the expansion sleeve;

[0034] Figure 13 for Figure 12 A top view of

[0035] Figure 14 for Figure 13 BB cross-sectional view;

[0036] In the picture:

[0037] 1-part, 2-center hole, 3-plane;

[0038] 4-base, 5-first countersunk hole, 6-second countersunk hole, 7-third countersunk hole, 8-fourth countersunk hole, 9-annular washer, 10-through slot, 11-countersunk slot, 12-movable plate, 13-spring, 14-inclined surface, 15-micrometer, 16-detection rod, 17-expansion sleeve, 18-opening, 19-conical head, 20-connector. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings. The scope of protection of the present invention is not limited to the following:

[0040] like Figures 3 to 11 As shown, a fixture for inspecting the symmetry of parts comprises a base 4, within which are sequentially formed, from top to bottom, a first countersunk hole 5, a second countersunk hole 6, a third countersunk hole 7, and a fourth countersunk hole 8, each with decreasing diameter. A mating annular washer 9 is fixed to the bottom of the first countersunk hole 5. A through slot 10 is formed in the annular washer 9, communicating with the second countersunk hole 6. The through slot 10 matches the outer contour of the part 1. Four countersunk grooves 11 are uniformly formed along the circumference of the annular washer 9, extending through the outer wall of the base 4. The annular washer 9 is secured to the bottom of the first countersunk hole 5 by a plurality of locking screws. The large slots of the countersunk grooves 11 are rectangular, while the small slots are circular.

[0041] A movable plate 12 is slidably installed in the large groove of the countersunk groove 11, and a spring 13 is fixed between the outer end surface of the movable plate 12 and the bottom of the large groove of the countersunk groove 11. The inner end surface of the movable plate 12 extends into the through groove 10, and a downwardly inclined inclined surface 14 is provided on the top surface of the extended end. A micrometer 15 is fixed to the outside of the small grooves of the four countersunk grooves 11. The detection rod 16 of the micrometer 15 passes through the small groove of the countersunk groove 11 and rests on the outer end surface of the movable plate 12;

[0042] An expansion sleeve 17 extending into the through groove 10 is fixedly provided at the bottom of the second countersunk hole 6. A tapered hole arranged along its axial direction is provided in the expansion sleeve 17. A plurality of openings 18 connected to the tapered hole are provided on the cylindrical surface of the expansion sleeve 17 along its circumferential direction. The openings 18 on the expansion sleeve 17 are evenly distributed on the expansion sleeve 17.

[0043] The bottom of the third countersunk hole 7 supports a conical head 19, the outer conical surface of which mates with the tapered hole of the expansion sleeve 17. The base 4 also includes a connector 20 that connects to the fourth countersunk hole 8 and is connected to the working port of the air compressor. The first countersunk hole 5, second countersunk hole 6, third countersunk hole 7, fourth countersunk hole 8, expansion sleeve 17, and conical head 19 are coaxially arranged within the base 4.

[0044] The working process of this utility model is as follows:

[0045] S1. The worker takes out a Figure 1~Figure 2 Part 1 shown;

[0046] S2. Installation of the part 1 to be tested. The specific steps are as follows:

[0047] S21. The worker orients the four flat surfaces 3 of part 1 toward the inclined surfaces 14 of the four movable plates 12, and then moves part 1 toward the expansion sleeve 17. When the bottom surface of part 1 presses against the inclined surfaces 14 of the four movable plates 12, the four movable plates 12 extend into the large groove of the countersunk groove 11 under pressure, compressing the spring 13. Simultaneously, the movable plates 12 press against the detection rod 16 of the dial indicator 15, and the dial indicator 15 displays the reading.

[0048] As the expansion sleeve 17 continues to move downward, the center hole 2 of the part 1 gradually covers the outside of the expansion sleeve 17. Figures 12 to 14 As shown, after the bottom surface of the part 1 is supported on the bottom of the first countersunk hole 5, the four movable plates 12 are respectively pressed against the four planes 3 of the part 1 under the elastic force of the spring 13;

[0049] S22. The worker resets the readings on the four dial indicators 15 to zero, thereby completing the installation of the part 1 to be inspected.

[0050] S3. The worker turns on the air compressor, which introduces pressurized gas into connector 20. After the pressurized gas enters fourth countersunk hole 8, it pushes conical head 19 upward. The outer conical surface of conical head 19 presses upward against the conical hole of expansion sleeve 17. At this time, the outer wall of expansion sleeve 17 expands outward to secure part 1, thereby aligning part 1. In other words, the centerline of part 1 coincides with the centerline of expansion sleeve 17.

[0051] S4. The worker observes whether there are readings on the four dial indicators 15. If a value is displayed on one of the dial indicators 15, it means that the plane 3 corresponding to the dial indicator 15 is tilted outward rather than vertical, which indicates that the symmetry of the part 1 does not meet the requirements, and the part 1 is determined to be unqualified. If no value is displayed on any of the four dial indicators 15, it means that the four planes 3 on the part 1 are vertical, which indicates that the symmetry of the part 1 meets the requirements, and the part is determined to be qualified, thus completing the symmetry inspection of the first part 1.

[0052] S5. The worker repeats steps S1 to S4 multiple times to continuously detect the symmetry of multiple parts 1.

[0053] Among them, it can be seen from steps S2~S3 that this inspection fixture only needs to gradually put the center hole 2 of the part 1 on the outside of the expansion sleeve 17 to achieve the installation of the part 1; then turn on the air compressor to introduce pressurized gas into the fourth countersunk hole 8, so that the conical head 19 moves upward, and the conical head 19 pushes the expansion sleeve 17 outward, thereby making the center line of the part 1 coincide with the center line of the expansion sleeve 17; finally, only need to observe whether there is a reading on the micrometer 15 to quickly complete the symmetry detection of a part 1.

[0054] As can be seen, compared to on-site inspection methods, this inspection fixture eliminates the need for workers to separately measure the horizontal spacing between the four planes 3 of part 1 and the axis of part 1 in four separate steps to complete the symmetry inspection of a single part 1. This significantly shortens the time required for part symmetry inspection and significantly improves part symmetry inspection efficiency. Furthermore, since the time required to inspect the symmetry of a single part 1 is shortened, it is possible to complete the inspection of hundreds of parts 1 in a workshop in a short period of time, further improving part symmetry inspection efficiency.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A checking fixture for detecting the symmetry of a part, characterized by: It comprises a base (4), wherein a first countersunk hole (5), a second countersunk hole (6), a third countersunk hole (7) and a fourth countersunk hole (8) are sequentially provided in the base (4) from top to bottom, wherein an annular washer (9) matching with the first countersunk hole (5) is fixed on the bottom of the hole, wherein a through groove (10) communicating with the second countersunk hole (6) is provided in the annular washer (9), wherein the through groove (10) matches the outer contour of the component (1), and wherein four countersunk grooves (11) penetrating the outer wall of the base (4) are uniformly provided in the annular washer (9) along its circumference. A movable plate (12) is slidably mounted in the large groove of the countersunk groove (11), a spring (13) is fixed between the outer end surface of the movable plate (12) and the bottom of the large groove of the countersunk groove (11), the inner end surface of the movable plate (12) extends into the through groove (10), and a downwardly inclined inclined surface (14) is provided on the top surface of the extended end, and a micrometer (15) is fixed on the outside of the small grooves of the four countersunk grooves (11), and a detection rod (16) of the micrometer (15) passes through the small groove of the countersunk groove (11) and rests on the outer end surface of the movable plate (12); An expansion sleeve (17) extending into the through groove (10) is fixedly provided at the bottom of the second countersunk hole (6), a tapered hole arranged along its axial direction is provided in the expansion sleeve (17), and a plurality of openings (18) communicating with the tapered hole are provided on the cylindrical surface of the expansion sleeve (17) along its circumferential direction; The bottom of the third countersunk hole (7) is supported by a conical head (19), the outer conical surface of which matches the conical hole of the expansion sleeve (17); the base (4) is also provided with a joint (20) connected to the fourth countersunk hole (8), and the joint (20) is connected to the working port of the air compressor.

2. A part symmetry inspection tool according to claim 1, characterized in that: The first countersunk hole (5), the second countersunk hole (6), the third countersunk hole (7), the fourth countersunk hole (8), the expansion sleeve (17) and the conical head (19) in the base (4) are coaxially arranged.

3. A part symmetry inspection tool according to claim 1, characterized in that: The openings (18) on the expansion sleeve (17) are evenly distributed on the expansion sleeve (17).

4. A part symmetry inspection tool according to claim 1, characterized in that: The annular washer (9) is fixed to the bottom of the first countersunk hole (5) via a plurality of locking screws.

5. The inspection tool for detecting part symmetry according to claim 1, characterized in that: The large groove of the countersunk groove (11) is a rectangular groove, and the small groove of the countersunk groove (11) is a circular hole.

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