Elastic testing head

Abstract

The utility model relates to an elastic testing head which comprises a force sensor and a testing head body, the testing head body is installed at the lower end of the force sensor, the testing head body comprises a connector, a spring, a guide rod and a guide cylinder, the guide cylinder is sleeved on the guide rod, the connector is provided with an installation hole, the guide rod is arranged in the installation hole in a penetrating mode, and the spring is arranged in the installation hole. One end of the spring abuts against the bottom of the mounting hole, the other end of the spring abuts against the guide rod, and the guide cylinder is in threaded connection with the connector. According to the elastic testing head, the force sensor identifies the stress condition of the testing head body, so that stress detection on the key is realized, the position of the spring can be limited through the conical surface at the bottom of the mounting hole and the conical positioning part, and the spring is prevented from being in contact with the inner wall of the mounting hole in a compressed state; the friction force generated by the spring during the second compression is avoided, the detection precision is further improved, and the concentricity of the testing head body is reduced by arranging the smooth part to be matched with the penetrating hole and arranging the limiting groove to be matched with the limiting part.

Description

Technical Field

[0001] The utility model relates to the technical field of key testing, in particular to an elastic test head. Background Art

[0002] In electronic devices such as computers and mobile phones, keys are usually provided for human-computer interaction operations with users. These keys may be physical keys or virtual touch keys, and these keys need to be tested for key performance feel and analyzed for the change of force before leaving the factory to find unqualified products. The existing method for testing the pressure of mobile phone keys is to manually use a pressure sensor to test each key one by one. During the process of pressing all the keys on the keyboard and then releasing them one by one, manual pressure is applied, resulting in low test efficiency. When manually operating the test head to press, the applied pressure is unstable, and there are errors in the test results. Content of the Utility Model

[0003] The main purpose of the utility model is to provide an elastic test head to solve the above technical problems and be able to automatically detect the force condition of the key.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] An elastic test head includes a force sensor and a test head body. The test head body is installed at the lower end of the force sensor. The test head body includes a connecting head, a spring, a guide rod, and a guide cylinder. The guide cylinder is sleeved on the guide rod. An installation hole is provided on the connecting head, and the guide rod passes through the installation hole. One end of the spring abuts against the bottom of the installation hole, and the other end abuts against the guide rod. The guide cylinder is threadedly connected to the connecting head.

[0006] As a preferred technical scheme, the bottom of the installation hole is a conical surface. One end of the spring abuts against the conical surface. A abutting portion is provided on the guide rod, and the abutting portion is arranged on the upper side of the guide rod. The other end of the spring abuts against the abutting portion.

[0007] As a preferred technical scheme, flat surfaces are provided on the upper and lower end faces of the spring.

[0008] As a preferred technical scheme, a conical positioning portion is provided on the guide rod, and the conical positioning portion is arranged above the abutting portion. The conical positioning portion passes through the spring.

[0009] As a preferred technical scheme, a through hole is provided in the guide cylinder, and the guide rod passes through the through hole. A smooth portion is provided on the guide rod, and the smooth portion matches the through hole.

[0010] As a preferred technical solution, the upper end of the guiding cylinder is provided with a first external thread, and the inner part of the mounting hole is provided with an internal thread, and the first external thread is connected to the internal thread.

[0011] As a preferred technical solution, a limiting part is further arranged on the guiding cylinder. The limiting part is arranged at the lower end of the first external thread, and a limiting groove is arranged inside the mounting hole, and the limiting groove is matched with the limiting part.

[0012] As a preferred technical solution, a conical surface structure is arranged on the guiding rod, and the conical surface structure is arranged on the lower side of the guiding rod.

[0013] As a preferred technical solution, a connecting rod is arranged at the upper end of the connecting head, a second external thread is arranged on the connecting rod, a threaded mounting hole is arranged at the lower end of the force sensor, and the force sensor is in threaded connection with the connecting rod through the threaded mounting hole.

[0014] As a preferred technical solution, vertical stripes are arranged on the outer surface of the connecting head.

[0015] The beneficial effects of the present utility model are as follows: For the above elastic test head, it can contact the product through the test head body, and the force sensor can identify the stress condition of the test head body, so as to realize the stress detection of the key. The bottom of the mounting hole is in a conical shape and is provided with a conical positioning part, which can limit the position of the spring, avoid the spring contacting the inner wall of the mounting hole in the compressed state, and avoid the generation of friction force when the spring is compressed for the second time, thereby improving the detection accuracy. And by setting the smooth part to match the through hole and the limiting groove to match the limiting part, the concentricity of the test head body is reduced, thereby improving the accuracy of the test. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the elastic test head related to Embodiment 1 of the present utility model;

[0017] Figure 2 It is a sectional view of the elastic test head related to Embodiment 1 of the present utility model;

[0018] Figure 3 It is an exploded view of the elastic test head related to Embodiment 1 of the present utility model;

[0019] Figure 4 It is a sectional view of the guiding cylinder related to Embodiment 1 of the present utility model;

[0020] Figure 5 It is a schematic structural diagram of the test mechanism related to Embodiment 2 of the present utility model. Detailed Embodiments

[0021] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] [Embodiment 1]

[0023] As Figure 1 shown, an elastic test head includes a force sensor 1 and a test head body 2. The test head body 2 is installed at the lower end of the force sensor 1. During the test, the test head body 2 contacts the product to be tested and continuously applies pressure. The force sensor 2 senses the pressure received by the test head body 2 until the limit value of the product to be tested is reached.

[0024] Please refer to Figure 2 and Figure 3 shown, the test head body 2 includes a connector 21, a spring 22, a guide rod 23 and a guide cylinder 24. The guide cylinder 24 is sleeved on the guide rod 23. The connector 21 is provided with a mounting hole 211 and a connecting rod 215. The mounting hole 211 is arranged at the bottom of the connector 21, and the connecting rod 215 is arranged at the top of the connector 21. The guide rod 23 passes through the mounting hole 211. One end of the spring 22 abuts against the bottom of the mounting hole 211, and the other end abuts against the guide rod 23. The guide cylinder 24 is threadedly connected to the connector 21. After the lower end of the guide rod 23 contacts the product to be tested, the spring 22 compresses, enabling the guide rod 23 to be in soft contact with the product to be tested and avoiding damage to the product to be tested. The upper end of the connector 21 is provided with a connecting rod 215, and the connecting rod 215 is provided with a second external thread 216. The force sensor 1 is provided with a threaded mounting hole 11, and the second external thread 216 is connected to the threaded mounting hole 11, thereby realizing the threaded connection between the force sensor 1 and the connecting rod 215, and fixing the force sensor 1 and the test head body 2.

[0025] Please refer to Figure 2 , Figure 3 and Figure 4Specifically, the bottom of the mounting hole 211 is a conical surface 212. One end of the spring 22 abuts against the conical surface 212. A contact portion 232 is provided on the guide rod 23. The contact portion 232 is arranged on the upper side of the guide rod 23. The other end of the spring 22 abuts against the contact portion 232. A conical positioning portion 231 is provided on the guide rod 23. The conical positioning portion 231 is arranged at the upper end of the contact portion 232. The conical positioning portion 231 passes through the spring 22. The contact portion 232 can support the spring 22. The conical positioning portion 231 and the conical surface 212 can limit the compression direction of the spring 22, preventing the spring 22 from deflecting during compression and rubbing against the inner wall of the mounting hole 211, which may cause errors in the data read by the force sensor 1. Further, upper and lower flat surfaces 221 and 222 are provided on the upper and lower end surfaces of the spring 22. The upper flat surface 221 contacts the conical surface 212, and the lower flat surface 222 contacts the upper end surface of the contact portion 232. By machining the upper and lower flat surfaces 221 and 222 on the spring 22, the contact area between the spring 22 and the conical surface 212 and the contact portion 232 can be increased, thereby increasing the friction force and preventing the spring 22 from rotating during use. After installation, the spring 22 is in a compressed state, and the lower end of the contact portion 232 abuts against the guide cylinder 24.

[0026] The guiding cylinder 24 is provided with a through hole 241, a first external thread 242, a limiting part 243, an operating part 244 and an avoidance cone 245. The through hole 241 runs through the whole guiding cylinder 24, and the guiding rod 23 is inserted into the through hole 241 to extend out and contact the product to be measured. A smooth part 233 is arranged on the guiding rod 23. The smooth part 233 matches the shape of the through hole 241. The surface roughness of the smooth part 233 is small and the fitting clearance is small, which can reduce the concentricity of the test head body 2, thereby improving the test accuracy. The first external thread 242 is arranged at the upper end of the guiding cylinder 24, and an internal thread 213 is arranged inside the mounting hole 211. The first external thread 242 is connected with the internal thread 213, thereby connecting and fixing the guiding cylinder 24 and the connecting head 21. The limiting part 243 is arranged at the lower end of the first external thread 242, and a limiting groove 214 is arranged inside the mounting hole 211. The limiting groove 214 is located at the lower end of the internal thread 213. The limiting groove 214 matches the limiting part 243, thereby further reducing the concentricity of the test head body 2, thereby improving the test accuracy. The operating part 244 is arranged at the lower end of the limiting part 243, and an end face 246 is arranged on the operating part 244. The guiding cylinder 24 can be clamped by a tool, so as to connect the first external thread 242 and the internal thread 213, so that the guiding cylinder 24 and the connecting head 21 are further locked and fixed. The avoidance cone 245 is arranged at the lower end of the operating part 244. A conical surface structure 234 is arranged on the guiding rod 23. The conical surface structure 234 is arranged on the lower side of the guiding rod 23. When installed on the guiding cylinder 24, the conical surface structure 234 extends out of the guiding cylinder 24, so as to facilitate the camera to identify the moving path of the guiding rod 23. The avoidance cone 245 can avoid the position to prevent blocking the camera from identifying the conical surface structure 234. Vertical stripes 217 are arranged on the outer surface of the connecting head 21, so as to facilitate the operator to tighten the test head body 2 to fix the test head body 2 and the force sensor 1. A contact surface 235 is arranged at the lower end of the guiding rod 23. The contact surface 235 contacts the product to be measured.

[0027] [Embodiment 2]

[0028] As Figure 5 shown, a testing mechanism includes a mounting plate 200, the elastic test head 100 described in Embodiment 1 and a bolt 400. A test mounting hole 300 is arranged on the mounting plate 200. A plurality of test mounting holes 300 are arranged according to the key positions to be tested. The force sensor 1 is provided with a threaded fixing hole 12. The threaded fixing hole 12 is arranged at the upper end of the force sensor 1, and the threaded fixing hole 12 is coaxially arranged with the threaded mounting hole 11. The bolt 400 passes through the test mounting hole 300 and is threadedly connected with the threaded fixing hole 12, thereby ensuring the concentricity of the contact surface 235 and the threaded fixing hole 12.

[0029] The above-described embodiments are only preferred examples of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present utility model should be included within the scope of the patent application of the present utility model.

Claims

1. An elastic test head, characterized in that, It includes a force sensor and a test head body. The test head body is installed at the lower end of the force sensor. The test head body includes a connecting head, a spring, a guide rod and a guide cylinder. The guide cylinder is sleeved on the guide rod. An installation hole is provided on the connecting head. The guide rod passes through the installation hole. One end of the spring abuts against the bottom of the installation hole, and the other end abuts against the guide rod. The guide cylinder is threadedly connected to the connecting head.

2. The elastic test head according to claim 1, wherein The bottom of the installation hole is conical. One end of the spring abuts against the conical surface. A abutting portion is provided on the guide rod. The abutting portion is arranged on the upper side of the guide rod. The other end of the spring abuts against the abutting portion.

3. The elastic test head according to claim 2, characterized in that, Flat surfaces are provided on the upper and lower end faces of the spring.

4. The elastic test head according to claim 3, characterized in that, A conical positioning portion is provided on the guide rod. The conical positioning portion is arranged above the abutting portion. The conical positioning portion passes through the spring.

5. The elastic test head according to claim 2, 3 or 4, characterized in that A through hole is provided in the guide cylinder. The guide rod passes through the through hole. A smooth portion is provided on the guide rod. The smooth portion matches the through hole.

6. The elastic test head according to claim 5, characterized in that, A first external thread is provided at the upper end of the guide cylinder. An internal thread is provided inside the installation hole. The first external thread is connected to the internal thread.

7. The elastic test head according to claim 6, characterized in that, A limiting portion is further provided on the guide cylinder. The limiting portion is arranged below the first external thread. A limiting groove is provided inside the installation hole. The limiting groove matches the limiting portion.

8. The elastic test head according to claim 7, characterized in that, A conical surface structure is provided on the guide rod. The conical surface structure is arranged on the lower side of the guide rod.

9. The elastic test head according to claim 8, wherein, A connecting rod is provided at the upper end of the connecting head. A second external thread is provided on the connecting rod. A threaded installation hole is provided at the lower end of the force sensor. The force sensor is threadedly connected to the connecting rod through the threaded installation hole.

10. The elastic test head according to claim 9, wherein, Vertical stripes are provided on the outer surface of the connecting head.

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