An electrical pushrod test fixture and test system

Abstract

The utility model relates to an electric push rod test tool and test system, including base plate and test station subassembly, test station subassembly includes slide rail, sliding block, pole fixed seat, motor fixed seat, first vibration sensor and second vibration sensor, through setting at least two groups of symmetrical test station subassembly, realized multistation parallel test, improved test efficiency significantly, adaptation scale production demand. And through the combination design of sliding block, slide rail and jackscrew, the position of pole fixed seat can be flexibly and continuously adjusted according to the length of electric push rod, the change operation is simple and fast, frequent dismounting positioning parts is avoided, the repeated positioning error is effectively reduced, and the accuracy of vibration test is guaranteed. At the same time, the vibration sensor is arranged at the push rod and motor position of electric push rod respectively, and the vibration performance data of electric push rod can be comprehensively and accurately obtained.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to an electric actuator testing fixture and testing system. Background Technology

[0002] With the rapid development of smart homes, medical rehabilitation, and the automotive industry, electric linear actuators, as core components for achieving linear drive, are finding increasingly widespread applications. They have been deeply integrated into various consumer and industrial products, including home lifting devices (such as height-adjustable desks and cabinets), medical care beds (such as the position adjustment mechanism of multi-functional rehabilitation beds), and car seats (such as seat back angle adjustment and seat height adjustment). In these applications, the noise and vibration levels of the electric linear actuator directly determine the user experience and the stability of the equipment. For example, low-noise operation of home lifting devices is crucial for ensuring a comfortable home environment; low vibration characteristics of medical care beds are related to the patient's rehabilitation experience and safety; and noise control in car seats is a significant factor affecting the comfort of drivers and passengers. Therefore, noise and vibration indicators have become core quality control indicators that must be strictly controlled during the production of electric linear actuators. Precise and efficient testing is a necessary step in the mass production of electric linear actuators.

[0003] To effectively detect the noise and vibration parameters of electric linear actuators, the industry commonly uses specialized testing fixtures for fixing and testing. However, current mainstream electric linear actuator testing fixtures still have many technical shortcomings in actual production applications, making it difficult to meet the needs of large-scale, high-efficiency production testing. The main problems are reflected in the following two aspects: On the one hand, existing testing fixtures mostly adopt a single-station design structure, meaning that one fixture can only fix and test one electric linear actuator at a time. In the context of large-scale production scenarios where the output of electric linear actuators is constantly increasing, the testing efficiency of single-station fixtures can no longer match the overall production rhythm of the production line. This makes the testing process a bottleneck restricting the increase in production line capacity, which not only increases production time costs but also reduces overall production efficiency, making it difficult to meet the needs of enterprises for mass production.

[0004] On the other hand, due to the different requirements for parameters such as the length and shape of electric actuators in different application scenarios, it is necessary to frequently change electric actuator motors of different specifications for testing during the production process. However, the positioning components such as stops and clamps of existing test fixtures are mostly fixed structures or require complex disassembly and reassembly operations for replacement. This not only makes the changeover operation cumbersome and time-consuming, affecting testing efficiency, but also easily leads to positioning benchmark deviation after multiple disassembly and reassembly, resulting in increased repeatability errors. This, in turn, affects the accuracy of noise and vibration test data, making it difficult to guarantee the reliability of test results and adversely affecting the quality control of electric actuators.

[0005] In summary, the current electric linear actuator testing fixtures suffer from problems such as low production line cycle time due to their single-station operation, complex changeover processes, and large repeatability errors. These issues have become key factors restricting the large-scale production and quality improvement of electric linear actuators, necessitating the development of a new type of electric linear actuator testing fixture that can solve these problems. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low production line cycle time, complex changeover and large repeated positioning error caused by the single station of the electric push rod testing fixture in the prior art.

[0007] To address the aforementioned technical problems, this utility model provides an electric actuator testing fixture, installed inside a test chamber, for conducting sound and vibration tests on the electric actuator, including: substrate; The test station assembly comprises at least two symmetrically arranged units. Each test station assembly includes a slide rail, a slider, a rod holder, a motor holder, a first vibration sensor, and a second vibration sensor. The slide rail is parallel to the top of the substrate, and multiple sliders are slidably mounted on the slide rail. A rod holder is mounted on the top of each slider, and at least one rod holder is equipped with the first vibration sensor. Each slider has a side plate extending vertically to one side of its corresponding slide rail, and the side plate has at least one threaded through hole corresponding to the position of the slide rail, with a set screw screwed into the threaded through hole. The motor holder is located on the top of the substrate and near one end of the slide rail, and the second vibration sensor is mounted on the motor holder.

[0008] In one embodiment of this utility model, a telescopic platform is included. The telescopic platform includes a base plate, a primary telescopic plate, and a secondary telescopic plate. The primary telescopic plate is slidably connected to and parallel to the base plate. The primary telescopic plate is connected to a first linear drive mechanism for driving its sliding. The secondary telescopic plate is slidably connected to the top of the primary telescopic plate and parallel to it. The secondary telescopic plate is connected to a second linear drive mechanism for driving its sliding. The base plate is mounted parallel to the top of the secondary telescopic plate.

[0009] In one embodiment of this utility model, two sets of position sensors are arranged at intervals in the sliding direction of the first-stage telescopic plate on the base plate, and a sensing sheet corresponding to the position of the position sensor is connected to the first-stage telescopic plate.

[0010] In one embodiment of this utility model, two bearing plates are symmetrically arranged on both sides of the primary telescopic plate, and a drag chain is arranged on each of the two bearing plates, with one end of the drag chain connected to the secondary telescopic plate.

[0011] In one embodiment of this utility model, a test microphone is also included. At least two test microphones are provided, and the two test microphones are respectively located on the top of the inner side of the test box and correspond to the positions of each test station component.

[0012] In one embodiment of the present invention, the rod fixing seat is provided with a U-shaped groove extending along the length direction of the slide rail, and the bottom of the U-shaped groove is provided with a first mounting groove for installing the first vibration sensor.

[0013] In one embodiment of the present invention, a contoured support block is further included. The contoured support block matches the shape of the U-shaped groove and is fitted into the U-shaped groove. The contoured support block has a through hole corresponding to the position of the first vibration sensor.

[0014] In one embodiment of the present invention, the motor mounting base is provided with an arc groove, and the bottom of the arc groove is provided with a second mounting groove for mounting the second vibration sensor.

[0015] In one embodiment of the present invention, the substrate is provided with a plurality of stops located at both ends of each slide rail.

[0016] A testing system comprising an electric actuator testing fixture as described in any of the preceding claims.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: Multi-station parallel testing with high efficiency: By setting up at least two sets of symmetrical test station components, multiple electric actuators can be fixed and tested simultaneously, which significantly improves testing efficiency and meets the needs of large-scale production.

[0018] Quick changeover and precise positioning: The rod fixing seat can be easily adjusted to accommodate electric actuators of different lengths through the cooperation of the slider and the slide rail, and is locked by the set screw on the side plate. The operation is simple and quick, avoiding frequent disassembly and assembly, effectively reducing repeated positioning errors and ensuring test accuracy.

[0019] Comprehensive testing and reliable data: By setting up a first vibration sensor (located on the rod mounting base to detect push rod vibration) and a second vibration sensor (located on the motor mounting base to detect motor vibration), and combining this with a test microphone to collect sound, comprehensive and accurate noise and vibration performance data of the electric push rod can be obtained. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1This is an isometric view of the electric actuator testing fixture of a preferred embodiment of this utility model; Figure 2 This is a schematic diagram of the test station assembly of the electric actuator test fixture according to a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the rod fixing seat of the electric actuator testing fixture according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the motor mounting base of the electric actuator testing fixture according to a preferred embodiment of this utility model; Figure 5 This is a schematic diagram of the telescopic platform of the electric actuator testing fixture according to a preferred embodiment of this utility model.

[0021] Explanation of reference numerals in the accompanying drawings: 1. Base plate; 2. Test station assembly; 21. Slide rail; 22. Slider; 23. Rod fixing seat; 24. Motor fixing seat; 25. First vibration sensor; 26. Second vibration sensor; 27. Side plate; 271. Threaded through hole; 28. Contouring support block; 3. Telescopic platform; 31. Base plate; 32. First telescopic plate; 33. Second telescopic plate; 34. First linear drive mechanism; 35. Second linear drive mechanism; 36. Position sensor; 37. Sensing plate; 4. Cable drag chain. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0023] Example 1, refer to Figures 1-5 As shown, this utility model discloses a test fixture for electric actuators, which is installed inside a test box and used to perform sound and vibration tests on electric actuators. The fixture includes... substrate1; Test station assembly 2, at least two sets of test station assemblies are symmetrically arranged. Each test station assembly 2 includes a slide rail 21, a slider 22, a rod fixing seat 23, a motor fixing seat 24, a first vibration sensor 25, and a second vibration sensor 26. The slide rail 21 is arranged parallel to the top of the substrate 1. Multiple sliders 22 are slidably arranged on the slide rail 21. A rod fixing seat 23 is installed on the top of each slider 22. At least one rod fixing seat 23 is equipped with a first vibration sensor 25. Each slider 22 has a side plate 27 that extends vertically to the side of the slide rail 21 on one side. The side plate 27 has at least one threaded through hole 271 corresponding to the position of the slide rail 21. A set screw is screwed into the threaded through hole 271. The motor fixing seat 24 is arranged on the top of the substrate 1 and close to one end of the slide rail 21. The second vibration sensor 26 is arranged on the motor fixing seat 24.

[0024] This invention discloses an electric actuator testing fixture and system. By setting at least two sets of symmetrical testing station components 2, it achieves multi-station parallel testing, significantly improving testing efficiency and adapting to the needs of large-scale production. Furthermore, the combined design of the slider 22, slide rail 21, and set screw allows the position of the rod fixing seat 23 to be flexibly and continuously adjusted according to the length of the electric actuator, simplifying and quickly changing the model, avoiding frequent disassembly of positioning components, effectively reducing repetitive positioning errors, and ensuring the accuracy of vibration testing. Simultaneously, vibration sensors are arranged at the actuator's push rod (output end) and motor (drive end) positions, constructing a three-dimensional diagnostic system that can comprehensively and accurately acquire vibration performance data of the electric actuator. This invention has a reasonable structure, is easy to operate, and effectively solves the problems of low testing efficiency, complex model changes, and difficulty in guaranteeing positioning accuracy in existing technologies.

[0025] Specifically, test station assembly 2 is the core functional unit of the entire electric linear actuator testing fixture. It is directly responsible for clamping and positioning the electric linear actuator and integrating sensors to collect key vibration data. Its design directly determines the efficiency, accuracy, and applicability of the test. At least two sets of test station assemblies 2 are symmetrically arranged in this fixture. This layout allows for the simultaneous installation, fixing, and testing of two or more electric linear actuators, enabling parallel testing and significantly improving testing efficiency, perfectly matching the production line cycle time of large-scale production.

[0026] The combination of the slide rail 21 and multiple sliders 22 in the test station assembly 2 achieves the function of "flexible length adaptation," as different models of electric actuators have different extension lengths of the actuator section. By allowing the rod fixing seat 23 supporting the actuator to slide on the slide rail 21, the distance between the rod fixing seats 23 can be steplessly adjusted, thus providing a precise and stable support point for electric actuators of different lengths. Furthermore, once the rod fixing seat 23 has slid to the appropriate position, simply tightening the set screw with a tool will securely lock the slider using the friction between the end of the set screw and the side of the slide rail 21. When changing models, simply loosening the set screw allows for movement, making the operation extremely simple and quick. Unlike fixtures that require complete disassembly, this locking method does not change the reference position of the slider 22 and the rod fixing seat 23 in space, effectively avoiding repetitive positioning errors caused by repeated disassembly and assembly. This ensures that the vibration sensor can detect at almost the same position each time, guaranteeing the accuracy and reliability of the test data. Meanwhile, vibration sensors are installed on the rod fixing seat 23 and the motor fixing seat 24 respectively in the test station component 2, which can comprehensively and accurately obtain the noise and vibration performance data of the electric actuator.

[0027] Reference Figure 5As shown, the system further includes a telescopic platform 3, which comprises a base plate 31, a primary telescopic plate 32, and a secondary telescopic plate 33. The primary telescopic plate 32 is slidably connected to and parallel to the base plate 31. The primary telescopic plate 32 is connected to a first linear drive mechanism 34 for driving its sliding. The secondary telescopic plate 33 is slidably connected to the top of the primary telescopic plate 32 and parallel to it. The secondary telescopic plate 33 is connected to a second linear drive mechanism 35 for driving its sliding. The base plate 1 is mounted parallel to the top of the secondary telescopic plate 33. Specifically, the telescopic platform 3 can smoothly and accurately move a bulky fixture with multiple electric actuators under test into and out of the test chamber, facilitating operation. When the fixture needs to be moved out, the secondary telescopic plate 33 moves first, extending outward a certain distance relative to the primary telescopic plate 32. Then, the primary telescopic plate 32, together with the secondary telescopic plate 33, extends outward relative to the base plate 31. This "two-stage progression" method allows for a longer total travel distance within a limited total height and floor space, enabling the tooling to be delivered a sufficient distance outside the test chamber, leaving ample space for operation.

[0028] Furthermore, two sets of position sensors 36 are arranged at intervals along the sliding direction of the primary telescopic plate on the base plate 31, and a sensing plate 37 corresponding to the position of the position sensors 36 is connected to the primary telescopic plate 32. Specifically, the two sets of sensors correspond to the two extreme points of the telescopic table 3: "fully retracted" (test position) and "fully extended" (loading / unloading position). When the sensing plate 37 moves to the sensor position with the primary telescopic plate 32, the sensor sends a signal, and the control system cuts off the power to the drive mechanism or stops it to prevent mechanical overshoot and protect the equipment safety.

[0029] Furthermore, two support plates are symmetrically arranged on both sides of the primary telescopic plate 32. A drag chain 4 is mounted on each support plate, with one end fixed to the base plate 31 or the root of the support plate, and the other end connected to the secondary telescopic plate 33. Specifically, all cables (such as signal lines of the first and second vibration sensors, and power supply lines that may be present on the motor mounting base) and air pipes connected to the secondary telescopic plate 33 (ultimately leading to the base plate and tooling) are systematically placed in the links of the drag chain 4. When the secondary telescopic plates 33 move relative to each other, the drag chain 4 performs synchronous, approximately semi-circular bending and stretching within its travel range. This movement ensures that the bending radius of the cables remains within a safe range, effectively preventing internal core wire breakage, outer sheath wear, or loosening of joints due to arbitrary bending or pulling, greatly improving the reliability and service life of the equipment.

[0030] Furthermore, the system includes at least two test microphones, each positioned on the top of the test chamber's inner side and corresponding to the location of each test station component 2. When the electric linear actuator operates at a test station, the generated sound propagates in all directions, and the test microphones on top of the test chamber can capture these sound signals in a timely manner. Because the test microphones correspond to the test station components 2, individual sound tests can be performed on the electric linear actuator at each test station, obtaining more accurate and detailed sound data. This sound data can be processed and analyzed using professional analysis software to assess whether the noise level of the electric linear actuator during operation meets standard requirements, providing crucial information for the quality inspection of the electric linear actuator.

[0031] Reference Figure 3 and Figure 4 As shown, the rod fixing seat 23 further includes a U-shaped groove extending along the length of the slide rail, and a first mounting slot for mounting the first vibration sensor 25 is provided at the bottom of the U-shaped groove. The design of the U-shaped groove is adapted to the shape of the push rod portion of the electric actuator, which can better fix the push rod and prevent it from rotating or displacing during testing. The first mounting slot provides a precise mounting position for the first vibration sensor 25, ensuring that the sensor can accurately collect the vibration signal of the push rod.

[0032] Furthermore, it also includes a contoured support block 28, which matches the shape of the U-shaped groove and fits into it. The contoured support block 28 has through holes corresponding to the position of the first vibration sensor 25. The contoured support block 28 acts like a custom-made "pad," allowing it to be replaced according to the shape of different electric actuators, thus improving the adaptability and stability of the fixation.

[0033] Furthermore, the motor mounting base 24 is provided with an arc-shaped groove, and a second mounting slot for mounting the second vibration sensor 26 is formed at the bottom of the arc-shaped groove. The design of the arc-shaped groove conforms to the shape of the electric actuator motor, which can effectively fix the motor and reduce the shaking of the motor during operation. The second mounting slot provides an accurate installation position for the second vibration sensor 26, ensuring that the sensor can accurately collect the vibration signal of the motor. This special design for the motor and sensor allows the motor mounting base 24 to provide good conditions for vibration testing while fixing the motor, ensuring the reliability and accuracy of the test data.

[0034] Furthermore, the substrate 1 is provided with multiple stops located at both ends of each slide rail 21. Specifically, when the slider 22 slides on the slide rail 21, once it reaches the end of the slide rail 21, the stop will act as a barrier, limiting the further movement of the slider 22. The stop effectively avoids problems such as tooling damage or test failure caused by excessive sliding of the slider 22, improving the stability and reliability of the test tooling. At the same time, the position of the stop 22 can be adjusted according to actual test requirements to accommodate the movement range of the slider when testing electric actuators of different lengths.

[0035] In embodiment two, this utility model also discloses a testing system, including the electric actuator testing fixture as in embodiment one.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A testing fixture for an electric actuator, installed inside a test chamber, for performing sound and vibration tests on the electric actuator, characterized in that: include, substrate; The test station assembly comprises at least two symmetrically arranged units. Each test station assembly includes a slide rail, a slider, a rod holder, a motor holder, a first vibration sensor, and a second vibration sensor. The slide rail is parallel to the top of the substrate, and multiple sliders are slidably mounted on the slide rail. A rod holder is mounted on the top of each slider, and at least one rod holder is equipped with the first vibration sensor. Each slider has a side plate extending vertically to one side of its corresponding slide rail, and the side plate has at least one threaded through hole corresponding to the position of the slide rail, with a set screw screwed into the threaded through hole. The motor holder is located on the top of the substrate and near one end of the slide rail, and the second vibration sensor is mounted on the motor holder.

2. The electric actuator testing fixture according to claim 1, characterized in that: The system includes a telescopic platform, which comprises a base plate, a primary telescopic plate, and a secondary telescopic plate. The primary telescopic plate is slidably connected to and parallel to the base plate. The primary telescopic plate is connected to a first linear drive mechanism for driving its sliding. The secondary telescopic plate is slidably connected to the top of the primary telescopic plate and parallel to it. The secondary telescopic plate is connected to a second linear drive mechanism for driving its sliding. The base plate is mounted parallel to the top of the secondary telescopic plate.

3. The electric actuator testing fixture according to claim 2, characterized in that: The base plate is provided with two sets of position sensors arranged at intervals in the sliding direction of the first-stage telescopic plate, and the first-stage telescopic plate is connected to a sensing plate corresponding to the position of the position sensors.

4. The electric actuator testing fixture according to claim 2, characterized in that: Two support plates are symmetrically arranged on both sides of the first-stage telescopic plate, and a drag chain is provided on each of the two support plates. One end of the drag chain is connected to the second-stage telescopic plate.

5. The electric actuator testing fixture according to claim 1, characterized in that: It also includes test microphones, of which at least two are provided. The two test microphones are respectively located on the top of the inside of the test box and correspond to the positions of each test station component.

6. The electric actuator testing fixture according to claim 1, characterized in that: The rod fixing seat has a U-shaped groove extending along the length of the slide rail, and the bottom of the U-shaped groove has a first mounting groove for installing the first vibration sensor.

7. The electric actuator testing fixture according to claim 6, characterized in that: It also includes a contoured support block, which matches the shape of the U-shaped groove and is fitted into the U-shaped groove, and the contoured support block has a through hole corresponding to the position of the first vibration sensor.

8. The electric actuator testing fixture according to claim 1, characterized in that: The motor mounting base is provided with an arc groove, and a second mounting groove for installing the second vibration sensor is provided at the bottom of the arc groove.

9. The electric actuator testing fixture according to claim 1, characterized in that: The base plate is provided with a plurality of stops located at both ends of each slide rail.

10. A testing system, characterized in that: Includes the electric actuator test fixture as described in any one of claims 1-9.

Images