A rivet nut coaxiality testing device

Abstract

The utility model relates to rivet nut detection equipment technical field, proposes a kind of rivet nut coaxality testing device, bearing pedestal is used to install rivet nut, test template can be set in the upper of bearing pedestal along guide column lifting, test needle assembly is set on test template and with bearing hole corresponds, test needle assembly includes test punch, test collar, test punch includes thread hole test section and rivet hole test section and coaxially sets, test collar is sleeved on thread hole test section and can move along the axial movement of thread hole test section, first detection point is set on test collar and is used to detect the matching coaxality of test collar and rivet hole, second detection point is set on thread hole test section and is used to detect the cooperation of thread hole test section and thread hole, third detection point is set on rivet hole test section and is used to detect the cooperation of rivet hole test section and rivet hole. Solve the problem that rivet nut detection coaxality detection is not complete in prior art, which may cause uneven riveting.

Description

Technical Field

[0001] This utility model relates to the technical field of rivet nut testing equipment, specifically to a rivet nut coaxiality testing device. Background Technology

[0002] Rivet nuts are used in conjunction with bolts for fastening. They are mainly used to connect different components, allowing the two components to be tightly connected and increasing the sealing effect.

[0003] Currently, the coaxiality of rivet nuts is tested by inserting a mandrel or pin gauge into the rivet nut hole, with the smaller diameter portion extending into the threaded bottom hole. The coaxiality of the rivet nut's inner hole is judged by observing whether the larger diameter portion can smoothly extend into the rivet hole. This method can only measure the coaxiality between the rivet hole and the threaded bottom hole, but it cannot measure the coaxiality between the rivet hole and the external rod diameter. When tightening with bolts, it is sufficient for the rivet hole and the threaded bottom hole to be coaxial within a certain range. However, after the bolt is installed into the threaded bottom hole, there may be a deviation in the coaxiality between the bolt and the rivet hole. This can lead to uneven deformation when the rivet hole is crushed, affecting the riveting effect. Utility Model Content

[0004] This invention proposes a rivet nut coaxiality testing device, which solves the problem that the lack of complete coaxiality testing for rivet nuts in the prior art may lead to uneven riveting.

[0005] The technical solution of this utility model is as follows:

[0006] A rivet nut coaxiality testing device includes a bearing base, guide columns, a test template, and a test pin assembly. The bearing base has a bearing hole for mounting the rivet nut. Multiple guide columns are disposed on the bearing base. The test template is movable up and down above the bearing base along the guide columns. The test pin assembly is disposed on the test template and corresponds to the bearing hole. The test pin assembly includes a test punch and a test collar. The test punch includes a threaded hole test section and a rivet hole test section, both coaxially arranged. The test collar is sleeved on the threaded hole test section and can move axially along the threaded hole test section. The test collar has a first detection point for detecting the coaxiality of the fit between the test collar and the rivet hole. The threaded hole test section has a second detection point for detecting the fit between the threaded hole test section and the threaded hole. The rivet hole test section has a third detection point for detecting the fit between the rivet hole test section and the rivet hole.

[0007] The second detection point is located between the top of the threaded hole test section and the top of the test collar in the initial position.

[0008] The testing device also includes springs, the number of which is the same as the number of guide posts. The springs are sleeved on the guide posts and are located between the test template and the support base.

[0009] The bearing base includes a lower pad and a bearing template. The guide post is disposed on the lower pad, and the bearing template has a guide hole, which is fitted onto the guide post.

[0010] A method for testing the coaxiality of rivet nuts, the method comprising the following steps:

[0011] Install the rivet nut to be tested into the bearing hole;

[0012] First-order coaxiality detection: The test template descends until the first detection point is triggered and continues until the second detection point is triggered.

[0013] For the second-order coaxiality test, after the first-order coaxiality test is passed, the test template continues to descend until the first, second, and third detection points are triggered simultaneously, at which point the test is considered passed.

[0014] The working principle and beneficial effects of this utility model are as follows:

[0015] This utility model discloses a device for testing the coaxiality of rivet nuts. The rivet nut to be tested is placed into a bearing hole on a bearing base. A test template located on the bearing base is raised and lowered via a guide column. A test pin assembly corresponding to the rivet nut to be tested is set on the test template. The test pin assembly consists of a test punch and a test collar. The test punch is divided into two coaxial sections: a threaded hole test section and a rivet hole detection section. The test collar is fitted onto the threaded hole test section and can move axially. A first detection point is set on the test collar, a second detection point is set on the threaded hole test section, and a third detection point is set on the rivet hole test section. During operation, the test collar first engages with the rivet hole, and the first detection point detects the rivet hole. The coaxiality of the ring and the rivet hole must meet the requirements. Assuming the coaxiality test of the rivet hole meets the requirements, the threaded hole test section is inserted into the threaded hole of the rivet nut. The second detection point checks whether the threaded hole test section and the threaded hole are properly fitted. As the threaded hole test section extends into the threaded hole, the test ring moves along the threaded hole test section and remains inside the rivet hole. Simultaneously, the third detection point on the rivet hole test section can be triggered after the rivet hole test section extends into the rivet hole. If the rivet hole machining does not meet the design requirements, the rivet hole test section cannot smoothly extend into the threaded hole, and the third detection point cannot be triggered, indicating that the rivet nut machining does not meet the requirements. This solution solves the problem of uneven riveting caused by the incomplete coaxiality detection of rivet nuts in the existing technology. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 The diagram shows the positional relationship between the test pin assembly and the rivet nut before the test.

[0018] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 The test device is shown with the test collar positioned above the rivet hole during the test.

[0019] Figure 3 This is a schematic diagram of the structure of the present utility model. Figure 3 The diagram shows the test device with the test collar positioned at the lower end of the rivet hole and the test section of the threaded hole extending into the threaded hole during the test.

[0020] Figure 4 This is a schematic diagram of the structure of the present utility model. Figure 4 The diagram shows the positional relationship of the test probe assembly fully extending into the rivet nut during the test.

[0021] Figure 5 This is a schematic diagram of the structure of the test probe assembly of this utility model;

[0022] In the diagram: 1. Bearing base, 2. Guide column, 3. Test template, 4. Bearing hole, 5. Test punch, 6. Test collar, 7. Threaded hole test section, 8. Rivet hole test section, 9. First test point, 10. Second test point, 11. Third test point, 12. Spring, 13. Lower pad, 14. Bearing template. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] like Figures 1-5As shown, this embodiment proposes a rivet nut coaxiality testing device. The testing device includes a bearing base 1, guide posts 2, a test template 3, and a test pin assembly. The bearing base 1 has bearing holes 4 for installing rivet nuts. Multiple guide posts 2 are disposed on the bearing base 1. The test template 3 is vertically movable above the bearing base 1 along the guide posts 2. The test pin assembly is disposed on the test template 3 and corresponds to the bearing holes 4. The test pin assembly includes a test punch 5 and a test collar 6. In this test, the test punch 5 includes a threaded hole test section 7 and a rivet hole test section 8, which are coaxially arranged. The test collar 6 is sleeved on the threaded hole test section 7 and can move along the axial direction of the threaded hole test section 7. The test collar 6 is provided with a first detection point 9 for detecting the coaxiality of the fit between the test collar 6 and the rivet hole. The threaded hole test section 7 is provided with a second detection point 10 for detecting the fit between the threaded hole test section 7 and the threaded hole. The rivet hole test section 8 is provided with a third detection point 11 for detecting the fit between the rivet hole test section 8 and the rivet hole.

[0025] In this embodiment, a rivet nut coaxiality testing device places the rivet nut to be tested into a bearing hole 4 on a bearing base 1. A test template 3 located on the bearing base 1 is raised and lowered via a guide post 2. A test needle assembly corresponding to the rivet nut to be tested is provided on the test template 3. The test needle assembly consists of a test punch 5 and a test collar 6. The test punch 5 is divided into two coaxial sections: a threaded hole testing section 7 and a rivet hole detection section 8. The test collar 6 is fitted onto the threaded hole testing section 7 and can move axially. A first detection point 9 is provided on the test collar 6, a second detection point 10 is provided on the threaded hole testing section 7, and a third detection point 11 is provided on the rivet hole testing section 8. During operation, the device measures... The test collar 6 first mates with the rivet hole. The first detection point 9 checks whether the coaxiality of the test collar 6 and the rivet hole meets the requirements. Under the premise that the coaxiality test of the rivet hole meets the requirements, the threaded hole test section 7 is inserted into the threaded hole of the rivet nut. The second detection point 10 checks whether the threaded hole test section 7 and the threaded hole are properly mated. As the threaded hole test section 7 extends into the threaded hole, the test collar 6 moves along the threaded hole test section 7 and remains in the rivet hole. At the same time, the third detection point 11 on the rivet hole test section 8 can be triggered after the rivet hole test section 8 extends into the rivet hole. If the rivet hole machining does not meet the design requirements, the rivet hole test section 8 cannot smoothly extend into the threaded hole, and the third detection point 11 cannot be triggered, that is, the rivet nut machining does not meet the requirements.

[0026] In a possible embodiment, miniature proximity switches can be installed within the test punch 5 and the test collar 6 as detection components for each detection point, namely the first detection point 9, the second detection point 10, and the third detection point 11. Connecting the miniature proximity switches to a data analysis unit allows for the acquisition of information on whether they are triggered. Specifically, a channel is provided within the test punch 5, with openings on the sides of the rivet hole test section 8 and the threaded hole test section 7. The detection end of the miniature proximity switch faces the opening of the channel. Similarly, a channel is also provided on the test collar 6, with the miniature proximity switch positioned within the channel and facing its opening. When the test collar 6, the threaded hole test section 7, and the rivet hole test section 8 are inserted into the rivet nut, a response is triggered when the side wall of the rivet nut's inner hole blocks the miniature proximity switch. If the rivet nut's hole is not machined correctly, it cannot be inserted, thus preventing the triggering of any detection point. A groove can be provided on the threaded hole test section 7, allowing the test collar 6 to move axially along the threaded hole test section 7 by using a slider on its inner side that engages with the groove. The lifting of test template 3 can be driven by a lifting drive component, which can be a pneumatic telescopic device with overpressure protection. When the rivet nut is not machined to meet the requirements and the test probe assembly cannot be inserted, protection can be achieved.

[0027] The second detection point 10 is located between the top of the threaded hole test section 7 and the top of the test collar 6 in the initial position.

[0028] Based on the above embodiments, the position of the second detection point 10 in the threaded hole test section 7 is optional. In a possible embodiment, when the test collar 6 is in the initial position of the threaded hole test section 7, the second detection point 10 can be set in the area between the top position of the threaded hole test section 7 and the top of the test collar 6. The initial position is before the test pin assembly contacts the rivet nut, and the test collar 6 is located on the side of the threaded hole test section 7 near the lower end, that is, on the side of the threaded hole test section 7 near the lower end within the movable range of the test collar 6. During the test, the test collar 6 first engages with the rivet hole of the rivet nut. If the rivet hole is machined to a satisfactory standard, the test collar 6 can extend into the rivet hole, triggering the first detection point 9. At this point, the coaxiality between the rivet hole portion of the rivet nut and the test collar 6 is satisfactory. Based on this, the second detection point 10 on the threaded hole test section 7 is not triggered. As the threaded hole test section 7 extends into the threaded hole of the rivet nut, the second detection point 10 will sequentially pass through the rivet hole portion, the inner diameter of the test collar 6, and the threaded hole portion. During this process, the detection accuracy of the second detection point 10 can be selectively set. For example, the second detection point 10 may not trigger when passing through the rivet hole portion, but will only trigger when passing through the test collar 6 and the threaded hole portion. Simultaneously, as the rivet hole test section 8 enters the rivet hole portion, the third detection point 11 is triggered, thus completing the test. During this process, when the first detection point 9 is triggered, the test collar 6 initially enters the rivet hole. As the second detection point 10 is triggered, the test collar 6 has already inspected the rivet hole. Under the premise of ensuring that the rivet hole and the external rod diameter maintain qualified coaxiality, the coaxiality of the threaded hole and the rivet hole is then inspected to achieve accurate measurement and improve the quality control of the rivet nut.

[0029] The testing device also includes springs 12, the number of which is the same as the number of guide posts 2. The springs 12 are sleeved on the guide posts 2 and are located between the test template 3 and the support base 1.

[0030] In this embodiment, a spring 12 is fitted onto the guide post 2 to assist in the lifting and lowering of the test template 3.

[0031] The bearing base 1 includes a lower pad 13 and a bearing template 14. The guide post 2 is disposed on the lower pad 13. The bearing template 14 is provided with a guide hole, and the guide hole of the bearing template 14 is sleeved on the guide post 2.

[0032] In this embodiment, the bearing base 1 is equipped with guide posts 2 on the lower pad 13, and guide holes are opened on the bearing template 14. The bearing template 14 is fitted onto the guide posts 2, and the bearing template 14 is accurately positioned. The test template 3 is also fitted onto the guide posts 2, so that the test template 3 and the bearing template 14 maintain accurate positional correspondence.

[0033] This application also discloses a method for testing the coaxiality of rivet nuts, which includes the following steps:

[0034] Install the rivet nut to be tested, and install the rivet nut to be tested into the bearing hole 4;

[0035] First-order coaxiality detection: Test template 3 descends until the first detection point 9 is triggered and continues until the second detection point 10 is triggered.

[0036] For the second-order coaxiality test, after the first-order coaxiality test is passed, the test template 3 continues to descend until the first detection point 9, the second detection point 10 and the third detection point 11 are triggered simultaneously, which is considered a pass.

[0037] In this embodiment, the proposed testing method, based on the technical concept of this application, measures the coaxiality of the threaded hole and the rivet hole while ensuring that the rivet hole and the external rod diameter maintain qualified coaxiality. This improves the production quality of the rivet nut. The rivet nut is installed and fixed in the bearing hole 4. Then, the test template 3 descends. As the test template 3 descends, the test collar 6 initially engages with the rivet hole of the rivet nut. If the coaxiality of the rivet hole and the external rod diameter is qualified, the test collar 6 can extend into it, triggering the first detection point 9 on the test collar 6. As plate 3 continues to descend, the second detection point 10 on the threaded hole test section 7 passes the test collar 6 and begins to initially insert into the threaded hole. The second detection point 10 is triggered, at which point the test collar 6 has fallen to the bottom of the rivet hole. Due to the small diameter of the threaded hole, the test collar 6 moves upward relative to the threaded hole test section 7. As the test plate 3 continues to descend, when the third detection point 11 is also triggered, that is, the rivet hole test section 8 extends into the rivet hole, then the rivet nut is qualified in terms of coaxiality between the rivet hole and the external rod diameter, and the coaxiality between the rivet hole and the threaded hole is also qualified, thereby improving the production quality of the rivet nut.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A rivet nut coaxiality testing device, characterized by, The testing device includes a support base (1), guide posts (2), a test template (3), and a test needle assembly. The support base (1) has a support hole (4) for installing a rivet nut. Multiple guide posts (2) are disposed on the support base (1). The test template (3) can be raised and lowered above the support base (1) along the guide posts (2). The test needle assembly is disposed on the test template (3) and corresponds to the support hole (4). The test needle assembly includes a test punch (5) and a test collar (6). The test includes a threaded hole test section (7) and a rivet hole test section (8) and are coaxially arranged. The test collar (6) is sleeved on the threaded hole test section (7) and can move along the axial direction of the threaded hole test section (7). The test collar (6) is provided with a first detection point (9) and is used to detect the coaxiality of the fit between the test collar (6) and the rivet hole. The threaded hole test section (7) is provided with a second detection point (10) and is used to detect the fit between the threaded hole test section (7) and the threaded hole. The rivet hole test section (8) is provided with a third detection point (11) and is used to detect the fit between the rivet hole test section (8) and the rivet hole.

2. The rivet nut coaxiality testing device of claim 1, wherein, The second detection point (10) is located between the top of the threaded hole test section (7) and the top of the test collar (6) in the initial position.

3. A rivet nut coaxiality testing device according to claim 2, wherein, The testing device also includes springs (12), the number of which is the same as the number of guide posts (2). The springs (12) are sleeved on the guide posts (2) and are located between the test template (3) and the support base (1).

4. A rivet nut coaxiality testing device according to claim 3, wherein, The bearing base (1) includes a lower pad (13) and a bearing template (14). The guide post (2) is disposed on the lower pad (13). The bearing template (14) is provided with a guide hole, and the guide hole of the bearing template (14) is sleeved on the guide post (2).

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