An acceleration sensor detection device

Abstract

The application relates to the field of sensor detection, in particular to an acceleration sensor detection device which comprises a support and a vibrator, the vibrator is installed on the support, the upper end surface of the vibrator is a vibration surface, the vibrator drives the vibration surface to vibrate, a detection table is arranged on the vibration surface, the detection tables are distributed in an upper and lower interval and are parallel to each other, at least one mounting seat is arranged on the detection table, an acceleration sensor is fixed on the detection table through the mounting seat, a cover body is further arranged on the vibrator, and at least one set of positioning components is arranged in the cover body. When the acceleration sensor is detected by using the vibrator, the multiple positioning ends of the positioning components are in contact with the circumferential side wall of the acceleration sensor and are fixed, so that the transverse displacement of the acceleration sensor is limited, the acceleration sensor can only move along the vibration direction, and the detection precision and accuracy of the acceleration sensor are improved.

Description

Technical Field

[0001] This application relates to the technical field of sensor detection, and in particular to an acceleration sensor detection device. Background Technology

[0002] An accelerometer is a sensor that can measure the acceleration of an object. It obtains acceleration by measuring the inertial force of the mass and Newton's second law. This type of sensor plays a key role in motion and has a wide range of applications, especially in industry, medicine, and social applications.

[0003] Accelerometer detection methods mainly include three types: basic measurement method, resonance measurement method, and impact measurement method. The basic measurement method involves using a vibration table to provide different acceleration values, recording the sensor's output signal, and performing measurements to determine the sensor's basic characteristics and errors.

[0004] In related technologies, a vibration table generally consists of three parts: a support, a vibrator, and a testing platform. The vibrator is mounted on the support, and the testing platform is mounted on the vibration surface of the vibrator. Mounting holes are provided on the testing platform, through which an accelerometer is fixed. The vibrator drives the testing platform and the accelerometer fixed on it to vibrate at low frequency, and the testing personnel complete the test by observing the signal output by the sensor.

[0005] The problem with the related technology is that traditional vibration tables may have a "low-frequency crawling" problem when they are working. That is, the vibration table will generate a small amount of lateral vibration (vibration perpendicular to the excitation axis) when it is working. Lateral vibration will introduce cross-axis error, resulting in inaccurate detection data from the acceleration sensor. Utility Model Content

[0006] To improve the accuracy of acceleration sensor detection results, this application provides an acceleration sensor detection device.

[0007] The acceleration sensor detection device provided in this application adopts the following technical solution:

[0008] An accelerometer detection device includes a bracket and a vibrator. The vibrator is mounted on the bracket, and its upper surface is a vibration surface. The vibrator drives the vibration surface to vibrate. A detection platform is provided on the vibration surface. The detection platform and the vibration surface are distributed vertically and horizontally at intervals and parallel to each other. At least one mounting seat is provided on the detection platform. The accelerometer is fixed to the detection platform by the mounting seat. A cover is also provided on the vibrator. At least one set of positioning components is provided inside the cover so that the accelerometer moves only along the vibration direction.

[0009] Optionally, the vibrator is vertically arranged, and a first connecting member is installed in the middle of the vibration surface. The lower end of the testing platform is connected to the first connecting member. The central axes of the testing platform, the first connecting member, and the vibrator coincide, and the vibrator can drive the testing platform to vibrate at a low frequency along the axial direction.

[0010] Optionally, a lifting assembly is installed on one side of the bracket. The lifting assembly has a drive end that can move in a direction parallel to the central axis of the vibrator. The drive end is provided with a second connector, which is connected to the cover. The opening end of the cover faces the vibrator and its central axis coincides with the central axis of the vibrator.

[0011] Optionally, the lifting assembly includes a screw and a guide rod that are configured to cooperate, a first driver connected to the screw, and a moving part. The moving part has holes that cooperate with the screw and the guide rod respectively, so that the driver can drive the moving part to move up and down. The driving end of the lifting assembly is located on the moving part.

[0012] Optionally, the housing has an opening facing the vibrator, and the positioning assembly is installed inside the housing at the end away from the vibrator. The positioning assembly has multiple positioning ends, each of which extends in a direction parallel to the vibration direction and is evenly distributed circumferentially to cooperate with the peripheral sidewall of the accelerometer fixed on the mounting base.

[0013] Optionally, the positioning component further includes a second driver, and each positioning end is connected to the second driver. The second driver can drive each positioning end to synchronously move closer to or away from the acceleration sensor.

[0014] Optionally, the cover includes a main body and a movable part, with a pick-and-place space formed between the main body and the detection stage for picking up and placing the accelerometer sensor. The movable part is detachably mounted on the main body to enable the pick-and-place space to be opened or closed, and the positioning component is disposed inside the main body.

[0015] Optionally, the testing platform is provided with multiple mounting seats, each mounting seat having a mounting hole, each mounting hole being adapted to a different type of accelerometer, and the number of positioning components is the same as the number of mounting seats and corresponds one-to-one.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. By setting up the positioning component, when using a vibrator to test the accelerometer, the multiple positioning ends of the positioning component are reserved with the peripheral wall of the accelerometer to limit the lateral displacement amplitude of the accelerometer, so that the accelerometer can only move along the vibration direction, thereby improving the detection accuracy and precision of the accelerometer. The enclosure can also isolate the accelerometer from the outside world during the testing process, appropriately reducing the impact of the external environment on the testing work. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a partial cross-sectional structure in front view of an embodiment of this application.

[0019] Figure 2 This is a side view structural diagram of an embodiment of this application.

[0020] Figure 3 This is a top view of an embodiment of the present application.

[0021] Reference numerals: 1. Bracket; 2. Vibrator; 3. Testing table; 4. Mounting base; 5. Cover; 51. Main body; 52. Movable part; 6. Positioning assembly; 61. Positioning end; 62. Second driver; 7. First connector; 8. Lifting assembly; 81. Screw; 82. Guide rod; 83. First driver; 9. Second connector. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0023] This application discloses an acceleration sensor detection device. (Refer to...) Figure 1 An accelerometer sensor testing device includes a support 1, a vibrator 2, and a testing platform 3. The support 1 is fixed to a base surface and has a roughly U-shaped cross-section with its open end facing upwards. The vibrator 2 is mounted on the support 1 through its open end. Fixing holes are formed on both sides of the support 1, and fasteners are installed in the fixing holes to connect the support 1 and the vibrator 2. The vibrator 2 is preferably installed in a suspended manner. The testing platform 3 is mounted on the vibrator 2, which drives the testing platform 3 to vibrate at a low frequency. A mounting base 4 is provided on the testing platform 3, and mounting holes for mounting the accelerometer sensor are formed on the mounting base 4. The testing personnel fix the accelerometer sensor on the mounting base 4. When the vibrator 2 is working, the accelerometer sensor vibrates at a low frequency with the testing platform 3 to detect the data from the accelerometer sensor.

[0024] When installing the accelerometer, it is mounted in the mounting hole and secured by screwing in high-strength hexagonal bolts. The bolts must be of a specification that matches the mounting hole, and the thread length must ensure that they are fully screwed into the hole without damaging the sensor's interior. The specific mounting structure of the accelerometer is existing technology and will not be described in detail here. Preferably, an ultra-thin spring washer can be installed between the high-strength hexagonal bolt and the accelerometer to prevent loosening and to avoid the bolt directly damaging the sensor housing.

[0025] Reference Figure 1 and Figure 3 The vibrator 2 can be a cylindrical structure with its central axis extending vertically. A vibrating surface is provided on the upper surface of the vibrator 2. When the vibrator 2 is working, it can drive the vibrating surface to vibrate at a low frequency. A first connecting member 7 is provided on the vibrating surface. The lower end of the aforementioned testing platform 3 is connected to the first connecting member 7, so that the plane of the testing platform 3 is parallel to the vibrating surface and is distributed vertically at intervals. The vibration force is transmitted from the vibrating surface to the testing platform 3 through the first connecting member 7. It should be noted that the central axes of the vibrator 2, the first connecting member 7, and the testing platform 3 should coincide.

[0026] To improve testing accuracy, testing stage 3 should be designed as an independent high-precision reference stage, and the material can be a high-rigidity alloy, with flatness error controlled within ≤0.01mm.

[0027] Reference Figure 1 and Figure 2 A lifting assembly 8 is installed on one side of the bracket 1. The lifting assembly 8 includes a screw 81, a guide rod 82, a first driver 83, and a moving part. The screw 81 and the guide rod 82 are configured to cooperate and are both parallel to the axis of the vibrator 2. The first driver 83 is connected to the screw 81 to drive the screw 81 to rotate. The moving part is sleeved on the screw 81 and the guide rod 82. According to the screw-nut transmission, the first driver 83 drives the screw 81 to rotate, which in turn drives the moving part to move up and down along the screw 81 and the guide rod 82. The guide rod 82 plays a guiding and limiting role.

[0028] A second connector 9 is provided on the moving part, and the second connector 9 is connected to a cover 5. The cover 5 has an opening facing the vibrator 2, so that the test table 3 can be covered from above the vibrator 2, isolating the acceleration sensor to be tested on the test table 3 from the external environment and reducing the impact of the external environment on the test work.

[0029] Furthermore, a positioning component 6 is provided inside the housing 5. The positioning component 6 is installed at the end of the housing 5 away from the vibrator 2 (i.e., the inner top of the housing 5) and corresponds to the mounting base 4 on the detection table 3. The positioning component 6 has a second driver 62 and multiple positioning ends 61 connected to the second driver 62. In the horizontal direction, the multiple positioning ends 61 of the positioning component 6 are evenly distributed on the periphery of the mounting base 4. Each positioning end 61 is set as a vertically extending rod-like structure. The second driver 62 can drive the multiple positioning ends 61 to synchronously move closer to or away from the central axis of the mounting base 4. When the acceleration sensor is fixed on the mounting base 4, the second driver 62 can adjust the distance between the multiple positioning ends 61 and the outer wall of the acceleration sensor. The specific settings of the first driver 83 and the second driver 62 adopt known technology and are not limited here.

[0030] With the above structure, before the accelerometer is installed on the mounting base 4 and ready for testing, the lifting assembly 8 can move the cover 5 downwards, bringing the positioning assembly 6 closer to the mounting base 4. At this time, the multiple positioning ends 61 of the positioning assembly 6 partially overlap in the vertical plane. Then, the second driver 62 drives the multiple positioning ends 61 closer to the accelerometer, so that the gap between each positioning end 61 and the peripheral wall of the accelerometer is ≤0.05mm. The positioning assembly 6 can limit the lateral displacement of the accelerometer, avoid the lateral vibration of the sensor from generating additional acceleration signals, and improve the detection accuracy of the accelerometer.

[0031] To improve the applicability and practicality of the accelerometer detection device, multiple evenly distributed mounting bases 4 can be set on the detection platform 3. The size of the mounting holes on each mounting base 4 is adapted to the different models of accelerometers to be tested, enabling the detection device to test multiple accelerometers simultaneously and improving detection efficiency. Correspondingly, multiple sets of positioning components 6 should also be provided, with each set of positioning components 6 corresponding one-to-one with each mounting base 4, so as to locate the multiple accelerometers to be tested.

[0032] In some preferred embodiments of this application, the cover 5 is divided into a main body 51 and a movable part 52. The main body 51 is connected to the second connecting member 9, and the positioning component 6 is disposed inside the main body 51, forming a pick-and-place space between the main body 51 and the testing table 3. Testing personnel can use this pick-and-place space to assemble and disassemble the accelerometer. The movable part 52 is detachably mounted on the main body 51 to control the opening and closing of the pick-and-place space. The detachable connection between the movable part 52 and the main body 51 uses known technology and is not limited here.

[0033] Before installing the accelerometer sensor, the movable part 52 is separated from the main body 51, opening the loading and unloading space to facilitate the installation of the accelerometer sensor by the testing personnel. After installation, the movable part 52 is connected to the main body 51 to close the loading and unloading space. The lifting assembly 8 then moves the main body 51 and the movable part 52 downward as a whole, so that the positioning assembly 6 can cooperate with the accelerometer sensor. After that, the vibrator 2 is started to perform the testing work. After the testing is completed, the lifting assembly 8 moves the main body 51 and the movable part 52 upward as a whole, separating the movable part 52 from the main body 51. The testing personnel then remove and take out the accelerometer sensor and prepare for subsequent testing work.

[0034] By configuring the cover 5 as consisting of a detachably connected main body 51 and a movable part 52, the displacement stroke of the cover 5 when picking up and placing the acceleration sensor can be reduced, which can limit the height of the screw 81 and the guide rod 82, thereby reducing the cost of the control device.

[0035] This application embodiment discloses an accelerometer detection device. By setting the positioning component 6, when the accelerometer is detected by the vibrator 2, a working gap is reserved between the multiple positioning ends 61 of the positioning component 6 and the peripheral sidewall of the accelerometer, which limits the lateral displacement amplitude of the accelerometer, so that the accelerometer can only move along the vibration direction, thereby improving the detection accuracy and precision of the accelerometer. The cover 5 can also isolate the accelerometer from the outside world during the detection process, thereby appropriately reducing the influence of the external environment on the detection work.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An accelerometer detection device, comprising a bracket (1) and a vibrator (2), wherein the vibrator (2) is mounted on the bracket (1), the upper end surface of the vibrator (2) is a vibration surface, and the vibrator (2) drives the vibration surface to vibrate, characterized in that: A detection platform (3) is provided on the vibration surface. The detection platform (3) is distributed vertically and horizontally with the vibration surface. At least one mounting base (4) is provided on the detection platform (3). The acceleration sensor is fixed on the detection platform (3) through the mounting base (4). A cover (5) is also provided on the vibrator (2). At least one set of positioning components (6) is provided inside the cover (5) so that the acceleration sensor moves only along the vibration direction. The cover (5) has an opening facing the vibrator (2), and the positioning component (6) is installed inside the cover (5) at one end away from the vibrator (2). The positioning component (6) has a plurality of positioning ends (61), each of which extends in a direction parallel to the vibration direction and is evenly distributed in the circumferential direction to cooperate with the circumferential sidewall of the acceleration sensor fixed on the mounting base (4). A working gap is reserved between the positioning end and the peripheral wall of the accelerometer, with a single-sided gap of ≤0.05mm, to limit the lateral displacement amplitude of the accelerometer.

2. The acceleration sensor detection device according to claim 1, characterized in that: The vibrator (2) is set vertically, and a first connector (7) is installed in the middle of the vibration surface. The lower end of the test platform (3) is connected to the first connector (7). The central axis of the test platform (3), the first connector (7) and the vibrator (2) coincides. The vibrator (2) can drive the test platform (3) to vibrate at a low frequency along the axial direction.

3. The acceleration sensor detection device according to claim 1, characterized in that: A lifting assembly (8) is installed on one side of the bracket (1). The lifting assembly (8) has a drive end that can move in a direction parallel to the central axis of the vibrator (2). The drive end is provided with a second connector (9). The second connector (9) is connected to the cover (5). The opening end of the cover (5) faces the vibrator (2) and the central axis coincides with the central axis of the vibrator (2).

4. The acceleration sensor detection device according to claim 3, characterized in that: The lifting assembly (8) includes a screw (81) and a guide rod (82) that are configured to cooperate, a first driver (83) connected to the screw (81), and a moving part. The moving part has holes that cooperate with the screw (81) and the guide rod (82) respectively, so that the first driver (83) can drive the moving part to move up and down. The driving end of the lifting assembly (8) is set on the moving part.

5. The acceleration sensor detection device according to claim 1, characterized in that: The positioning component (6) also includes a second driver (62), and each of the positioning ends (61) is connected to the second driver (62). The second driver (62) can drive each positioning end (61) to move synchronously closer to or further away from the acceleration sensor.

6. The acceleration sensor detection device according to claim 1, characterized in that: The cover (5) includes a main body (51) and a movable part (52). The main body (51) and the detection table (3) form a pick-and-place space for picking up and placing the acceleration sensor. The movable part (52) is detachably installed on the main body (51) so that the pick-and-place space can be opened or closed. The positioning component (6) is disposed inside the main body (51).

7. The acceleration sensor detection device according to claim 1, characterized in that: The detection platform (3) is provided with multiple mounting seats (4), each mounting seat (4) having a mounting hole, each mounting hole being adapted to a different type of acceleration sensor. The number of positioning components (6) is the same as the number of mounting seats (4) and corresponds one-to-one.

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