Injection molded part fatigue testing apparatus

Abstract

This utility model relates to a fatigue testing device for injection molded parts, comprising a drive motor, a bearing housing, an eccentric shaft, a universal joint, a slider, a tension / compression sensor, and a damping spring assembly. The eccentric shaft is rotatably mounted on the bearing housing, with one end connected to the output end of the drive motor and the other end used to mount the injection molded part under test. The tension / compression sensor is mounted on the slider, with one end connected to the damping spring assembly and the other end connected to the universal joint, which is used to connect to the injection molded part under test. This testing device enables individual aging fatigue testing of the injection molded part, simplifies the testing process, eliminates the assembly process of the injection molded part with other parts, saves testing costs, and improves testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a fatigue testing device for injection molded parts. Background Technology

[0002] To ensure the lifespan of injection-molded parts in products such as massage chairs, fatigue testing is generally required. Current fatigue testing methods involve assembling the injection-molded part with other components into a finished product, followed by aging fatigue testing. Because multiple parts need to be installed, the assembly and testing process is cumbersome, resulting in excessively high costs for a single aging fatigue test of a vulnerable part and low testing efficiency, thus impacting the overall product development speed and cost. Utility Model Content

[0003] This invention addresses existing technical problems by providing a fatigue testing device for injection molded parts.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A fatigue testing device for injection molded parts includes a drive motor, a bearing housing, an eccentric shaft, a universal joint, a slider, a tension / compression sensor, and a damping spring assembly. The eccentric shaft is rotatably mounted on the bearing housing. One end of the eccentric shaft is connected to the output end of the drive motor, and the other end of the eccentric shaft is used to mount the injection molded part to be tested. The tension / compression sensor is mounted on the slider. One end of the tension / compression sensor is connected to the damping spring assembly, and the other end of the tension / compression sensor is connected to the universal joint. The universal joint is used to connect to the injection molded part to be tested.

[0005] Based on the above technical solution, the present invention can be further improved as follows:

[0006] Preferably, it further includes an adjusting plate and a fixing plate. Two adjusting plates are provided and located on both sides of the fixing plate. The damping spring assembly is mounted on the fixing plate. The fixing plate is U-shaped with the opening facing upward. Connecting plates are installed on both side walls of the fixing plate. The connecting plates are connected to the adjusting plates by adjusting bolts.

[0007] Preferably, the adjusting plate is L-shaped.

[0008] Preferably, it also includes a slide rail, on which the slider and the damping spring assembly are mounted.

[0009] Preferably, the drive motor is a servo motor, and the drive motor is connected to the eccentric shaft via a conveyor belt.

[0010] Preferably, a rotating shaft is installed on one side of the injection molded part being tested, and the universal joint is hinged to the rotating shaft.

[0011] Preferably, the outer wall of the eccentric shaft has a flat cut surface.

[0012] The beneficial effects of this invention are: this testing device enables the individual aging fatigue testing of the injection molded part, simplifies the testing process, eliminates the process of assembling the injection molded part with other parts, saves testing costs, and improves testing efficiency. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0014] Figure 2 This is a three-dimensional schematic diagram of the present invention from another angle;

[0015] Figure 3 This is a schematic diagram of the rotating shaft of this utility model.

[0016] The attached diagram is labeled as follows: 1. Drive motor; 2. Bearing housing; 3. Eccentric shaft; 3.1. Flat section; 4. Injection molded part under test; 5. Universal joint; 6. Slider; 7. Tension / compression sensor; 8. Damping spring assembly; 9. Adjusting plate; 10. Fixing plate; 11. Slide rail; 12. Adjusting bolt; 13. Connecting plate; 14. Rotating shaft; 15. Base plate. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0019] like Figures 1 to 3As shown, this utility model discloses a fatigue testing device for injection molded parts, including a drive motor 1, a bearing housing 2, an eccentric shaft 3, a universal joint 5, a slider 6, a tension / compression sensor 7, and a damping spring assembly 8. The damping spring assembly 8 adopts existing technology. The eccentric shaft 3 is rotatably mounted on the bearing housing 2. One end of the eccentric shaft 3 is connected to the output end of the drive motor 1. Specifically, the drive motor 1 is a servo motor. The drive motor 1 is connected to the eccentric shaft 3 via a conveyor belt. The other end of the eccentric shaft 3 is used to mount the injection molded part 4 to be tested. The tension / compression sensor 7 is mounted on the slider 6. One end of the tension / compression sensor 7 is connected to the damping spring assembly 8, and the other end of the tension / compression sensor 7 is connected to the universal joint 5. The universal joint 5 is used to connect to the injection molded part 4 to be tested.

[0020] Specifically, the injection molded part 4 under test is mounted on the eccentric shaft 3 via bearings. When the drive motor 1 drives the eccentric shaft 3 to rotate, the distance between the injection molded part 4 under test and the damping spring assembly 8 changes due to the eccentric structure of the eccentric shaft 3. The damping spring assembly 8 applies tension or thrust to the injection molded part 4 under test, thereby realizing the aging fatigue test of the injection molded part 4 under test. The structure is simple and the test is convenient. Furthermore, the tension or thrust on the injection molded part 4 under test is displayed by the tension or compression sensor 7, and the speed of the drive motor 1 can be adjusted to ensure the accuracy of the test results and the convenience of use.

[0021] The injection molded part fatigue testing device also includes an adjusting plate 9 and a fixed plate 10. Two adjusting plates 9 are located on either side of the fixed plate 10. The damping spring assembly 8 is mounted on the fixed plate 10. The fixed plate 10 is U-shaped with its opening facing upwards. Connecting plates 13 are installed on both side walls of the fixed plate 10, and the connecting plates 13 are connected to the adjusting plates 9 via adjusting bolts 12. By adjusting the distance between the connecting plates 13 and the adjusting plates 9, the distance between the damping spring assembly 8 and the injection molded part 4 under test is adjusted, thereby adjusting the magnitude of the force applied by the damping spring assembly 8 to meet the testing requirements of the injection molded part 4, improving its applicability and reducing testing costs.

[0022] In this embodiment, the adjusting plate 9 is L-shaped. The adjusting plate 9 is mounted on the base plate 15 by fastening screws or bolts, ensuring the secure installation of the adjusting plate 9. Optionally, the adjusting plate 9 can also be connected to the base plate 15 by a flathead bolt passing through the bottom of the base plate 15.

[0023] The injection molded part fatigue testing device also includes a slide rail 11, which is mounted on a base plate 15. The slider 6 and the damping spring assembly 8 are mounted on the slide rail 11. This ensures that the slider 6, the tension / compression sensor 7, and the damping spring assembly 8 are aligned in a straight line, guaranteeing the accuracy of the test results. When the eccentric shaft 3 rotates, the slider 6 and the tension / compression sensor 7 reciprocate along the slide rail 11, continuously applying tension or thrust to the injection molded part 4 under test during this movement, thus performing fatigue testing on the injection molded part 4. When it is necessary to adjust the force on the injection molded part 4 under test, the damping spring assembly 8 is moved along the slide rail 11 to adjust the distance between the damping spring assembly 8 and the injection molded part 4 under test. This is then locked using the adjusting bolt 12 and the locking nut, improving the convenience of adjustment and simplifying operation.

[0024] In this embodiment, a rotating shaft 14 is mounted on one side of the injection molded part 4 under test, and the universal joint 5 is hinged to the rotating shaft 14. Specifically, one side of the injection molded part 4 under test is provided with two spaced lugs, and a receiving groove is formed between the two lugs. The connecting part of the universal joint 5 is inserted into the receiving groove, and the rotating shaft 14 is inserted into the lugs and the universal joint 5. When the injection molded part 4 under test moves with the rotation of the eccentric shaft 3, the universal joint 5 and the rotating shaft 14 rotate to avoid jamming and ensure the accuracy of the test results.

[0025] Furthermore, a flat surface 3.1 is provided on the outer wall of the eccentric shaft 3. Using the flat surface 3.1 as a reference, it is convenient to adjust the initial state of the eccentric shaft 3.

[0026] The procedure for using this testing device is as follows:

[0027] The injection molded part 4 to be tested is mounted on the eccentric shaft 3. The flat section 3.1 of the eccentric shaft 3 is perpendicular to the base plate 15. The screw-in length of the adjusting bolt 12 is adjusted to adjust the distance between the damping spring assembly 8 and the injection molded part 4 to make the instrument reading of the tension and compression sensor 7 "0".

[0028] Set the drive motor 1 to speed mode and adjust the speed of the drive motor 1 to correspond to the test frequency of the injection molded part 4 under test;

[0029] When the eccentric part of the eccentric shaft 3 is located on the side closer to the universal joint 5, the damping spring assembly 8 applies a pushing force to the tension / compression sensor 7 and the injection molded part 4 under test. When the eccentric part of the eccentric shaft 3 is located on the side farther away from the universal joint 5, the damping spring assembly 8 applies a pulling force to the tension / compression sensor 7 and the injection molded part 4 under test. That is, during the rotation of the eccentric shaft 3, the damping spring assembly 8 continuously applies forces in different directions to the injection molded part 4 under test, thereby realizing the aging fatigue test of the injection molded part 4 under test. The test is convenient and the test cost is reduced.

[0030] The above description is only a preferred embodiment of the present utility model and is 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 should be included within the protection scope of the present utility model.

Claims

1. An injection molded part fatigue testing apparatus, characterized by, The device includes a drive motor (1), a bearing housing (2), an eccentric shaft (3), a universal joint (5), a slider (6), a tension / compression sensor (7), and a damping spring assembly (8). The eccentric shaft (3) is rotatably mounted on the bearing housing (2). One end of the eccentric shaft (3) is connected to the output end of the drive motor (1), and the other end of the eccentric shaft (3) is used to mount the injection molded part (4) to be tested. The tension / compression sensor (7) is mounted on the slider (6). One end of the tension / compression sensor (7) is connected to the damping spring assembly (8), and the other end of the tension / compression sensor (7) is connected to the universal joint (5). The universal joint (5) is used to connect to the injection molded part (4) to be tested.

2. The injection molded fatigue testing device of claim 1, wherein, It also includes an adjusting plate (9) and a fixing plate (10). The adjusting plate (9) has two parts and is located on both sides of the fixing plate (10). The damping spring assembly (8) is installed on the fixing plate (10). The fixing plate (10) is U-shaped with the opening facing upward. Connecting plates (13) are installed on both sides of the fixing plate (10). The connecting plates (13) are connected to the adjusting plate (9) by adjusting bolts (12).

3. The injection molded fatigue testing device of claim 2, wherein, The regulating plate (9) is L-shaped.

4. The injection molded fatigue testing device of claim 3, wherein, It also includes a slide rail (11), on which the slider (6) and the damping spring assembly (8) are mounted.

5. The injection molded fatigue testing device of claim 1, wherein, The drive motor (1) is a servo motor, and the drive motor (1) is connected to the eccentric shaft (3) via a conveyor belt.

6. The injection molded fatigue testing device of claim 1, wherein, A rotating shaft (14) is installed on one side of the injection molded part (4) being tested, and the universal joint (5) is hinged to the rotating shaft (14).

7. The injection molded fatigue testing device of claim 1, wherein, The outer wall of the eccentric shaft (3) is provided with a flat surface (3.1).

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