An apparatus for evaluating characteristics of a swing assembly

Abstract

The application provides a device for evaluating characteristics of a pendulum assembly, comprising a pressure loading frame, a pendulum assembly fixing seat, a detection cap and a pressurizing bolt; the pressure loading frame comprises two fixing parts; the pendulum assembly fixing seat is installed in one fixing part of the pressure loading frame and comprises a positioning holder for placing the pendulum assembly and a magnetic steel placed in a central concave cavity of the positioning holder; the detection cap is placed on the pendulum assembly and is provided with at least two capacitive measuring devices for detecting the positions of the central pendulum and the symmetrical gold regions along the pendulum axis; the pressurizing bolt is installed in the other fixing part of the pressure loading frame and is used for pressing the detection cap; the central axes of the pendulum assembly fixing seat, the detection cap and the pressurizing bolt are collinear. The device can accurately measure the position difference of the two sides of the central pendulum of the pendulum assembly in the swinging process, effectively evaluate the distortion state of the flat bridge of the pendulum assembly, and has simple operation and strong repeatability.

Description

Technical Field

[0001] This invention relates to the field of quartz flexible accelerometer testing, and more specifically to a device for evaluating the characteristics of a pendulum assembly. Background Technology

[0002] The accelerometer's detection mass pendulum, also known as the pendulum assembly, consists of two torque converter moving coils symmetrically connected at the center of the pendulum plate. The center of the pendulum plate is connected to its outer ring via an extremely thin quartz bridge. The pendulum assembly, along with the upper and lower torque converters, forms a force feedback device. When acceleration is applied to the input shaft, an acceleration torque is generated. The servo circuit receives the signal and generates a feedback current. This current is transmitted through the terminal of the lower torque converter and the wire connecting the terminal to the outer ring of the pendulum plate, passing through the gold-plated layer of the pendulum plate to the moving coil of the torque converter. Under the influence of the permanent magnetic field of the torque converter, a restoring torque is generated, causing the detection mass pendulum to return to its original equilibrium position. The meter core is composed of the upper torque converter, the pendulum assembly, and the lower torque converter connected by a band. Each of the upper torque converter, the pendulum assembly, and the lower torque converter has a circular outer circumference of approximately equal diameter. The pendulum assembly is held in the middle by the upper and lower torque converters. Ideally, after the accelerometer movement is assembled, the central axes of the upper and lower torquers should coincide with the central axis of the pendulum assembly, and the pendulum assembly should move along these central axes during operation, with its central axis always coinciding with the central axes of the upper and lower torquers. However, due to the influence of parts machining accuracy and component assembly accuracy, the center of gravity of the pendulum assembly is not on its pendulum axis, causing the quartz bridge to twist during the pendulum assembly's movement along the input axis, affecting the product's output accuracy.

[0003] Currently, the center of gravity of the pendulum assembly can only be controlled through two methods: increasing the precision requirements of parts machining and increasing the precision requirements of assembly. However, unilaterally pursuing higher parts machining precision directly leads to increased costs, and the cumulative error factors in the assembly process are difficult to completely eliminate. In actual production, the pendulum assembly often experiences torsion of the flat bridge during operation after assembly due to the eccentricity of the central pendulum or the misalignment of the plane of the pendulum flat bridge with the ideal pendulum axis, affecting the measurement accuracy of the product. Currently, there is no effective means to detect the torsion of the flat bridge during the movement of the pendulum assembly, making it difficult to efficiently optimize the characteristics of the pendulum assembly. Summary of the Invention

[0004] The purpose of this invention is to provide a device for evaluating the characteristics of a pendulum assembly. This device can detect whether there is flat bridge distortion during the pendulum assembly's swing process, thereby providing a basis for assisting in the repair of the pendulum assembly.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0006] An apparatus for evaluating the characteristics of a pendulum assembly includes a pressure loading frame, a pendulum assembly mounting base, a detection cap, and a pressure bolt. The pressure loading frame includes two fixing parts. The pendulum assembly mounting base is installed in one fixing part of the pressure loading frame and includes a positioning bracket for placing the pendulum assembly and a magnet placed in the central cavity of the positioning bracket. The detection cap is placed on the pendulum assembly and is equipped with at least two capacitance measuring devices for detecting the position of the central pendulum and the symmetrical gold region along the pendulum axis of the pendulum assembly. The pressure bolt is installed in the other fixing part of the pressure loading frame and applies pressure to the detection cap. The central axes of the pendulum assembly mounting base, the detection cap, and the pressure bolt are collinear.

[0007] Furthermore, the detection cap includes a second outer shell and two capacitance measuring devices, which are capacitance sensors; the second outer shell is cylindrical and has two axial mounting holes at a central axis symmetrical position, the mounting holes for mounting capacitance sensors; the detection areas of the two capacitance sensors correspond to two gold areas of equal area that are symmetrical along the pendulum axis of the pendulum assembly.

[0008] Furthermore, a pressure measuring device is also installed on the test cap, and the pressure bolt presses onto the pressure measuring device on the test cap.

[0009] Furthermore, the pressure measuring device comprises a pressure sensor and a pressure bearing; a first groove is provided on one end face of the second housing, and the pressure sensor and pressure bearing are installed in the first groove; a second groove and a third groove are provided on the other end face of the second housing along the central axis, the second groove being away from the end face, having an inner diameter greater than the outer diameter of the moving ring of the pendulum assembly, and a depth greater than the height of the moving ring of the pendulum assembly, the third groove being close to the end face, and having an inner diameter equal to the inner diameter of the outer ring of the pendulum assembly; an opening is reserved at the edge of the third groove of the detection cap for the pendulum assembly lead wire to pass through, the lead wire connecting the outer ring of the pendulum assembly to the power supply.

[0010] Furthermore, the pressure loading frame includes a bottom edge and an upper cantilever parallel to the bottom edge, and the bottom edge and the upper cantilever are provided with openings with collinear central axes; the pressure bolt is installed in the cantilever opening of the pressure loading frame, and the two are engaged by a threaded structure; the swing assembly fixing seat is placed in the bottom edge opening.

[0011] Furthermore, the pressure bolt includes a first housing, a screw plug, a spring, and a pressure column; the first housing is a cylindrical structure with a base plate at one end, and the base plate has a central hole; the pressure column, spring, and screw plug are sequentially installed inside the first housing, one end of the pressure column passes through the central hole of the base plate and extends out of the first housing, and the screw plug presses the other end of the pressure column against the base plate by the spring.

[0012] Furthermore, the screw plug is connected to the first housing via a threaded structure; the pressure column includes a head section and a tail section that are fixedly connected, the outer diameter of the head section is larger than the outer diameter of the tail section, and the tail section has a scale.

[0013] Furthermore, the positioning support includes a small columnar body and a large columnar body that are collinear with their central axes and are fixedly connected; the small columnar body is used to connect with the bottom edge opening of the pressure loading frame; the exposed end face of the large columnar body is provided with a cavity, the magnet is placed in the cavity, the height of the cavity is greater than the moving coil of the swing assembly, and the outer diameter of the magnet is smaller than the inner diameter of the moving coil.

[0014] Furthermore, the large cylindrical cavity includes four sequentially connected cavities—a first cavity, a second cavity, a third cavity, and a fourth cavity—coaxial with the positioning support, starting from the end face. The inner diameter of the first cavity is the same as the outer diameter of the pendulum assembly. The inner diameter of the second cavity is smaller than the inner diameter of the outer ring of the pendulum assembly but larger than the outer diameter of the central pendulum of the pendulum assembly. The inner diameter of the third cavity is larger than the inner diameter of the moving coil of the pendulum assembly. The inner diameter of the fourth cavity is larger than that of the third cavity. The sum of the heights of the third and fourth cavities is greater than the height of the moving coil of the pendulum assembly.

[0015] Furthermore, the depth of the first cavity is less than the thickness of the pendulum; the depth of the second cavity is comparable to the depth of the third groove, the depth of the third groove being between 0.02mm and 0.5mm; the height of the third cavity is between 2mm and 6mm; the inner diameter of the fourth cavity is 2mm to 8mm smaller than the outer diameter of the positioning bracket; the sum of the heights of the first cavity, second cavity, third cavity, and fourth cavity is less than the height of the large columnar body by 1mm to 5mm; the large columnar body is a cylinder made of magnetically conductive material; the magnet is a cylinder made of permanent magnet material.

[0016] The beneficial effects of this invention compared to the prior art are as follows:

[0017] The device for evaluating the characteristics of a pendulum assembly provided by the present invention applies a simulated current to the pendulum assembly, causing the central pendulum of the pendulum assembly to swing due to the interaction force between the central pendulum and the magnet of the positioning seat of the pendulum assembly. The position of the central pendulum and the symmetrical gold area along the pendulum axis of the pendulum assembly can be detected by the detection cap when the central pendulum of the pendulum assembly moves, thereby qualitatively evaluating the degree of torsion of the pendulum assembly flat bridge during the working process.

[0018] This invention controls the pressure between the test cap, the pendulum assembly, and the pendulum assembly positioning seat by using a pressure bolt and a pressure sensor on the test cap to meet the environmental requirements of the accelerometer. This invention can simulate the pressure and moving coil current changes of the pendulum assembly during the actual operation of the accelerometer, and the measurement data is closer to the actual working state.

[0019] The device for evaluating the characteristics of pendulum components provided by this invention is simple to operate and highly repeatable. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] Figure 1 A schematic diagram of the structure of a device for evaluating the characteristics of a pendulum component provided in a specific embodiment of the present invention;

[0022] Figure 2 A top view of an apparatus for evaluating the characteristics of a pendulum component provided in a specific embodiment of the present invention;

[0023] Figure 3 for Figure 1 A schematic diagram of the pressure bolt structure in the diagram;

[0024] Figure 4 for Figure 1 A schematic diagram of the detection cap structure in the image;

[0025] Figure 5 for Figure 1 Top view of the detection cap in the image;

[0026] Figure 6 for Figure 1 A schematic diagram of the positioning seat structure of the pendulum component.

[0027] The above figures include the following reference numerals:

[0028] 1. Pressure loading frame; 2. Pressure bolt; 3. Detection cap; 4. Swing assembly positioning seat; 5. Swing assembly; 2.1. First outer shell; 2.2. Plug; 2.3. Spring; 2.4. Pressure column; 3.1. Second outer shell; 3.2. First capacitive sensor; 3.3. Second capacitive sensor; 3.4. Pressure sensor; 3.5. Pressure bearing; 4.1. Positioning bracket; 4.2. Magnet. Detailed Implementation

[0029] Specific embodiments of the present invention will now be described in detail. In the following description, specific details are set forth for purposes of explanation and not limitation, in order to aid in a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced in other embodiments departing from these specific details.

[0030] It should be noted that, in order to avoid obscuring the invention with unnecessary details, only the device structure and / or processing steps closely related to the solution of the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0031] The accelerometer's pendulum assembly includes a pendulum plate, a first moving coil, and a second moving coil. The pendulum plate includes a central pendulum, an outer ring coaxial with the central pendulum, and a flat bridge connecting the central pendulum and the outer ring. The first and second moving coils are mounted on opposite sides of the central pendulum, and the central axes of the first moving coil, the pendulum plate, and the second moving coil are collinear. The straight line passing through the center of the flat bridge and the center of the outer ring on the plane containing the pendulum plate is the pendulum axis, and the pendulum plate structure is symmetrical about the pendulum axis.

[0032] The present invention provides an apparatus for evaluating the characteristics of a pendulum assembly, comprising a pressure loading frame 1, a pressure bolt 2, a detection cap 3, and a pendulum assembly fixing seat 4; the pressure loading frame 1 includes two fixing parts; the pendulum assembly fixing seat 4 is installed in one fixing part of the pressure loading frame 1, including a positioning bracket for placing the pendulum assembly and a magnet placed at the center of the positioning bracket; the detection cap 3 is placed on the pendulum assembly, and at least two capacitance measuring devices are provided for detecting the position of the central pendulum and the symmetrical gold area along the pendulum axis of the pendulum assembly; the pressure bolt 2 is installed in the other fixing part of the pressure loading frame 1 and applies pressure to the detection cap 3; the central axes of the pendulum assembly fixing seat 4, the pendulum assembly, the detection cap 3, and the pressure bolt 2 are collinear.

[0033] In the aforementioned apparatus for evaluating the characteristics of a pendulum assembly, a pressure loading frame is used to position the pressure bolt and the pendulum assembly positioning seat, and to provide rigid support for the pressure bolt and the pendulum assembly positioning seat; the pressure bolt is used to provide pressure between the detection cap, the pendulum assembly, and the pendulum assembly positioning seat; the detection cap is equipped with a capacitive sensor for detecting the position of the central pendulum of the pendulum assembly and the gold area symmetrically positioned along the pendulum axis; the pendulum assembly positioning seat is used to fix the pendulum assembly and to provide driving force to the energized coil of the pendulum assembly through a magnet installed on the pendulum assembly positioning seat.

[0034] The device for evaluating the characteristics of a pendulum assembly provided by this invention can accurately measure the positional difference between the two sides of the central pendulum of the pendulum assembly during the swing process, thereby efficiently evaluating the torsional state of the flat bridge of the pendulum assembly. In addition, the device is simple to operate and has strong repeatability.

[0035] Furthermore, a pressure measuring device is installed at the center of one side of the test cap, and a pressure bolt is applied to the pressure measuring device on the test cap. The pressure measuring device installed on the test cap is used to measure the pressure between the test cap, the pendulum assembly, and the pendulum assembly positioning seat. By measuring the pressure between the test cap, the pendulum assembly, and the pendulum assembly positioning seat in real time through the pressure measuring device, the pressure exerted on the pendulum assembly during the actual operation of the accelerometer can be accurately simulated.

[0036] When testing the pendulum assembly using the above-mentioned device, the outer ring of the pendulum plate is placed on the positioning support, and the second moving coil of the pendulum assembly is placed outside the magnet, without contacting the magnet. The detection cap is placed on the outer ring of the pendulum assembly, without contacting the first moving coil. A simulated current is applied to the outer ring of the pendulum assembly. When the pendulum assembly is stationary, the central pendulum hangs down. After applying the simulated current to the outer ring of the pendulum assembly, the second moving coil interacts with the magnet, causing the central pendulum to swing. The position of the central pendulum and the symmetrical gold area along the pendulum axis can be detected through the detection cap, thereby qualitatively evaluating the degree of torsion of the pendulum assembly's flat bridge during operation.

[0037] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and a specific embodiment.

[0038] like Figure 1 As shown, this embodiment provides an apparatus for evaluating the characteristics of a pendulum assembly, comprising:

[0039] (1) Pressure loading frame

[0040] like Figure 1 As shown, the pressure loading frame 1 includes a bottom edge and an upper cantilever parallel to the bottom edge. The upper cantilever of the pressure loading frame 1 has a threaded hole for fixing the pressure bolt 2. The bottom edge of the pressure loading frame has a through hole for fixing the swing assembly mounting base 4. The central axes of the threaded hole and the through hole are collinear and perpendicular to the bottom edge of the pressure loading frame.

[0041] (2) Pressure bolt

[0042] like Figure 3 As shown, the pressure bolt 2 has a spring plunger structure, used to provide pressure between the test cap 3, the pendulum assembly positioning seat 4, and the outer ring of the pendulum assembly 5 when testing the performance of the pendulum assembly. The pressure bolt 2 includes a first housing 2.1, a screw plug 2.2, a spring 2.3, and a pressure column 2.4. The first housing 2.1 is a cylindrical structure with a base plate at one end, and the base plate has a central hole. The pressure column 2.4, the spring 2.3, and the screw plug 2.2 are sequentially installed inside the first housing 2.1. One end of the pressure column 2.4 passes through the central hole of the base plate and extends out of the first housing 2.1. The screw plug 2.2 presses the other end of the pressure column 2.4 against the base plate of the first housing 2.1 through the spring 2.3.

[0043] The first outer casing 2.1 has an internal thread on its inner side at the open end (i.e., the end furthest from the base plate), with a thread width between 5 mm and 25 mm. The plug 2.2 is a cylindrical structure with external threads, and it is connected to the open end of the first outer casing 2.1 via a threaded engagement. The inner diameter of the center hole in the base plate is 0.5 mm to 3 mm smaller than the inner diameter of the internal thread structure of the first outer casing 2.1.

[0044] Spring 2.3 is a compression spring with a diameter of 10mm to 30mm, used to provide pressure. The outer diameter of spring 2.3 is slightly smaller than the inner diameter of the first housing 2.1.

[0045] The pressure column 2.4 has a stepped, T-shaped variable-diameter structure. The pressure column 2.4 includes a fixed head section and a tail section. The outer diameter of the head section is larger than that of the tail section. The tail section passes through the central hole of the base plate of the first housing 2.1, and the head section is confined within the cavity of the pressure bolt 2. Preferably, the outer diameter of the head section is slightly smaller than the inner diameter of the first housing 2.1, but larger than the inner diameter of the central hole of the base plate and the outer diameter of the spring 2.3. The outer diameter of the tail section of the pressure column 2.4 is slightly smaller than the inner diameter of the central hole of the base plate and has graduations to identify the length of the pressure column 2.4 exposed outside the first housing 2.1.

[0046] The pressure bolt 2 is provided with external threads and is fitted into the cantilevered threaded hole on the pressure loading frame 1. Preferably, in order to limit the pressure bolt 2 in the cantilevered threaded hole on the pressure loading frame 1, the outer surface of the pressure bolt 2 forms a stepped diameter-changing structure, that is, a stepped structure with a larger outer diameter is provided at the end away from the base plate. The smaller outer diameter portion of the pressure bolt 2 is provided with an external thread structure, and the pressure bolt 2 is installed in the cantilevered threaded hole on the pressure loading frame 1 through the external thread structure.

[0047] Pressure is applied downwards by adjusting the height of the pressure bolt 2 relative to the upper cantilever.

[0048] (3) Testing cap

[0049] like Figure 4 , 5 As shown, the detection cap 3 includes a second outer shell 3.1, a first capacitive sensor 3.2, a second capacitive sensor 3.3, a pressure sensor 3.4, and a pressure bearing 3.5.

[0050] The second outer shell 3.1 is cylindrical, with an outer diameter similar to that of the pendulum assembly 5. The second outer shell 3.1 has three blind grooves (blind grooves are recessed grooves on the end face of a cylinder) arranged along its central axis, including a top circular hole blind groove, a bottom circular hole blind groove, and a bottom outer ring blind groove. The inner diameter of the top circular hole blind groove is larger than the outer diameter of the tail section of the pressure column; the inner diameter of the bottom circular hole blind groove is slightly larger than the outer diameter of the first moving coil of the pendulum assembly 5, and the depth of the bottom circular hole blind groove is greater than the height of the first moving coil of the pendulum assembly 5; the inner diameter of the bottom outer ring blind groove is similar to the inner diameter of the outer ring 5 of the pendulum assembly, and its depth is between 0.02 mm and 0.5 mm.

[0051] Two mounting holes are symmetrically opened in the diameter direction of the first housing 3.1, between 4mm and 15mm from the central axis of the first housing 3.1, to install the first capacitive sensor 3.2 and the second capacitive sensor 3.3, respectively. The mounting hole parameters should be set such that when the central axis of the pendulum assembly 5 is collinear with the central axis of the detection cap 3, and the pendulum axis of the pendulum assembly 5 is perpendicular to the line connecting the centers of the two mounting holes, the detection area of ​​the first and second capacitive sensors includes two gold-plated areas (i.e., gold areas) of equal area, symmetrical along the pendulum axis of the pendulum assembly. The two capacitive sensors are independent capacitive sensors with the same specifications and height. With the help of the above-mentioned capacitive sensors, the position status of the corresponding gold area on the central pendulum of the pendulum assembly 5 can be detected during the adjustment process. In actual operation, the two capacitive sensors are connected to the data acquisition and processing equipment through lead wires. The pressure sensor 3.4 is placed in the blind slot of the top circular hole, and a pressure bearing 3.5 is installed on the pressure measuring platform of the pressure sensor 3.4.

[0052] When the device is working, the detection cap 3 is fastened to the outer ring of the pendulum assembly 5. The bottom edge of the blind groove of the outer ring of the detection cap 3 has a reserved opening for the pendulum assembly 5 lead wire to pass through. The lead wire connects the outer ring of the pendulum assembly 5 to the power supply and applies a simulated current to the pendulum assembly 5 through the lead wire.

[0053] (4) Positioning seat for pendulum components:

[0054] like Figure 6As shown, the pendulum assembly positioning seat 4 includes a positioning bracket 4.1 and a magnet 4.2. The positioning bracket 4.1 includes two small cylindrical bodies and a large cylindrical body with different outer diameters, fixedly connected. The outer diameter of the small cylindrical body is smaller than that of the large cylindrical body, and the central axes of the two cylindrical bodies are collinear. The positioning bracket 4.1 is connected to the pressure loading frame 1 through the through hole of the small cylindrical body. The large cylindrical body is a magnetically conductive cylinder with an outer diameter slightly larger than that of the pendulum assembly 5. Starting from the end away from the small cylindrical body, four cavities—a first cavity, a second cavity, a third cavity, and a fourth cavity—are arranged sequentially and coaxially with the positioning bracket 4.1. The inner diameter of the first cavity is approximately equal to the outer diameter of the pendulum assembly 5, and the depth is between 0.2 mm and 5 mm. The depth of the first cavity is less than the thickness of the pendulum plate, ensuring that the detection cap transmits pressure to the pendulum plate. The inner diameter of the second cavity is slightly smaller than the inner diameter of the outer ring of the pendulum assembly 5 but larger than the outer diameter of the central pendulum of the pendulum assembly 5. The depth of the second cavity is approximately equal to the depth of the blind groove of the bottom outer ring. The height of the third cavity is between 2mm and 6mm, and its inner diameter is slightly larger than the inner diameter of the second moving coil of the pendulum assembly 5. The inner diameter of the fourth cavity is slightly larger than that of the third cavity and 2mm to 8mm smaller than the outer diameter of the positioning bracket 4.1. The sum of the heights of the third and fourth cavities is greater than the height of the second moving coil of the pendulum assembly 5, and the sum of the heights of the first, second, third, and fourth cavities is less than the height of the large cylindrical body by 1mm to 5mm. The magnet 4.2 is a cylinder of permanent magnet material, whose outer diameter is slightly smaller than the inner diameter of the second moving coil of the pendulum assembly 5, its height is greater than the height of the second moving coil of the pendulum assembly 5, and its height is smaller than the sum of the heights of the third and fourth cavities. The magnet 4.2 is connected to the positioning bracket 4.1 by welding or gluing, and after connection, the central axes of the magnet 4.2 and the positioning bracket 4.1 are collinear.

[0055] In a preferred embodiment of the present invention, the range of motion of the pressure column on the pressure bolt is 20mm, and the maximum pressure that the spring can bear is 200N; the capacitive sensor end face on the detection cap has a circular outer diameter of 5mm; the inner diameter of the blind groove of the outer ring at the bottom of the detection cap is 0.6mm smaller than the inner diameter of the outer ring of the pendulum assembly, and the depth is 0.3mm; the outer diameter of the pendulum assembly positioning seat is 1mm larger than the outer diameter of the pendulum assembly; the outer diameter of the magnet on the pendulum assembly positioning seat is 0.6mm smaller than the inner diameter of the second moving coil on the pendulum assembly; the inner diameter of the third cavity of the pendulum assembly positioning seat is 0.6mm larger than the outer diameter of the second moving coil on the pendulum assembly; the depth of the first cavity of the pendulum assembly positioning seat is 0.5mm, the depth of the second cavity is 0.3mm, and the inner diameter of the fourth cavity is 17mm; after the pendulum assembly is placed on the pendulum assembly positioning seat, the distance between the magnet and the bottom surface of the second moving coil on the pendulum assembly is 0.3mm.

[0056] Preferably, the positioning bracket and magnet are made of the same material as the torque device. Specifically, the positioning bracket is made of Invar alloy; the magnet is an assembly with an AlNiCo or Samarium Cobalt magnetic material at the bottom and a nickel-iron alloy (high magnetic permeability material) sheet attached to the top. The outer diameter of the magnetic material and the nickel-iron alloy sheet are the same, and the magnet structure is consistent with that of the torque device.

[0057] The features described and / or illustrated above for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or in combination with or in lieu of features in other embodiments.

[0058] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, components, or combinations thereof.

[0059] Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0061] The parts of this invention not described in detail are techniques known to those skilled in the art.

Claims

1. A device for evaluating the characteristics of a pendulum assembly, characterized in that, Includes pressure loading frame, pendulum component mounting base, detection cap, and pressure bolts; The pressure loading frame includes two fixing parts; The pendulum component fixing seat is installed in a fixing part of the pressure loading frame. The pendulum component fixing seat includes a positioning bracket for placing the pendulum component and a magnet placed in the central cavity of the positioning bracket. The detection cap is placed on the pendulum assembly, and the detection cap is equipped with at least two capacitance measuring devices for detecting the position of the central pendulum and the gold area symmetrically arranged along the pendulum axis of the pendulum assembly. The pressure bolt is installed in another fixing part of the pressure loading frame and applies pressure to the detection cap; The central axes of the pendulum assembly fixing seat, the detection cap, and the pressure bolt are collinear. The detection cap includes a second outer shell and two capacitance measuring devices, which are capacitance sensors. The second outer shell is cylindrical and has two axial mounting holes at a central axis symmetrical position. The mounting holes are used to install the capacitance sensors. The detection areas of the two capacitance sensors correspond to two gold areas of equal area that are symmetrical about the pendulum axis of the pendulum assembly.

2. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 1, characterized in that, The test cap is also equipped with a pressure measuring device, and the pressure bolt presses on the pressure measuring device of the test cap.

3. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 2, characterized in that, The pressure measuring device consists of a pressure sensor and a pressure bearing; a first groove is provided on one end face of the second housing, and the pressure sensor and pressure bearing are installed in the first groove; a second groove and a third groove are provided on the other end face of the second housing along the central axis, the second groove being away from the end face, having an inner diameter greater than the outer diameter of the moving ring of the pendulum assembly, and a depth greater than the height of the moving ring of the pendulum assembly, the third groove being close to the end face, and having an inner diameter equal to the inner diameter of the outer ring of the pendulum assembly; an opening is reserved at the edge of the third groove of the detection cap for the pendulum assembly lead wire to pass through, the lead wire connecting the outer ring of the pendulum assembly to the power supply.

4. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 1, characterized in that, The pressure loading frame includes a bottom edge and an upper cantilever parallel to the bottom edge. The bottom edge and the upper cantilever are provided with openings with collinear central axes. The pressure bolt is installed in the cantilever opening of the pressure loading frame, and the two are engaged by a threaded structure. The swing assembly fixing seat is placed in the bottom edge opening.

5. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 1, characterized in that, The pressure bolt includes a first housing, a screw plug, a spring, and a pressure column; the first housing is a cylindrical structure with a base plate at one end, and the base plate has a central hole; the pressure column, spring, and screw plug are sequentially installed inside the first housing, one end of the pressure column passes through the central hole of the base plate and extends out of the first housing, and the screw plug presses the other end of the pressure column against the base plate by the spring.

6. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 5, characterized in that, The screw plug is connected to the first housing via a threaded structure; the pressure column includes a head section and a tail section that are fixedly connected, the outer diameter of the head section is larger than the outer diameter of the tail section, and the tail section has a scale.

7. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 3, characterized in that, The positioning support includes a small columnar body and a large columnar body that are collinear with their central axes and are fixedly connected; the small columnar body is used to connect with the bottom edge opening of the pressure loading frame; the exposed end face of the large columnar body is provided with a cavity, the magnet is placed in the cavity, the height of the cavity is greater than the moving coil of the swing assembly, and the outer diameter of the magnet is smaller than the inner diameter of the moving coil.

8. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 7, characterized in that, The large cylindrical cavity includes four sequentially connected cavities, a first cavity, a second cavity, a third cavity, and a fourth cavity, coaxial with the positioning support, starting from the end face. The inner diameter of the first cavity is the same as the outer diameter of the pendulum assembly. The inner diameter of the second cavity is smaller than the inner diameter of the outer ring of the pendulum assembly but larger than the outer diameter of the central pendulum of the pendulum assembly. The inner diameter of the third cavity is larger than the inner diameter of the moving coil of the pendulum assembly. The inner diameter of the fourth cavity is larger than that of the third cavity. The sum of the heights of the third and fourth cavities is greater than the height of the moving coil of the pendulum assembly.

9. The apparatus for evaluating the characteristics of a pendulum assembly according to claim 8, characterized in that, The depth of the first cavity is less than the thickness of the swing plate; the depth of the second cavity is the same as the depth of the third groove, between 0.02mm and 0.5mm; the height of the third cavity is between 2mm and 6mm; the inner diameter of the fourth cavity is 2mm to 8mm smaller than the outer diameter of the positioning bracket; the sum of the heights of the first cavity, second cavity, third cavity, and fourth cavity is less than the height of the large columnar body by 1mm to 5mm; the positioning bracket and the magnet are made of the same material as the torque device.

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