A multi-parameter adjustable electro-mechanical converter dynamic and static characteristic test experiment table

Abstract

The present application relates to a kind of multi-parameter adjustable electro-mechanical converter dynamic and static characteristic test experimental table, including adjustable electro-mechanical converter, pre-tightening force adjusting device and tension-compression sensor sequentially arranged from left to right, the adjustable electro-mechanical converter is composed of adjustable coil assembly and air gap adjusting device, the pre-tightening force adjusting device is equipped with limit shell in the middle, adjustable stiffness composite spring is arranged in the limit shell, first push rod is arranged in the left end of pre-tightening force adjusting device, second push rod is arranged in the right end, the left and right ends of first push rod are respectively butt-jointed with the right end of adjustable electro-mechanical converter and the left end of limit shell, the left and right ends of second push rod are respectively butt-jointed with the right end of limit shell and the left end of tension-compression sensor.The present application integrates two kinds of dynamic and static test mode, realizes flexible adjustment of multiple test, multi-parameter acquisition, improves the comprehensive function of equipment, test efficiency, precision and operation convenience.

Description

Technical Field

[0001] This invention relates to the field of electromagnet performance testing technology, and in particular to a test bench for the dynamic and static characteristics of a multi-parameter adjustable electro-mechanical converter. Background Technology

[0002] With the continuous development of digital hydraulic technology, there is an urgent need in the field of intelligent hydraulics for high-frequency response performance of small-sized, high-speed switching valves. As the core component of high-speed switching valves, the electromagnet is the key driving element for the valve core to generate high-frequency switching, and its rapid response determines the performance of the high-speed switching valve. However, for electromagnets with high response, short stroke, and high precision, there is still a lack of simple and effective testing methods for static and dynamic performance, which to some extent limits the development process of electromagnets. Electromagnet performance testing equipment is crucial for optimizing the structural design of electromagnets, improving control strategies, and verifying and perfecting simulation models.

[0003] Existing electromechanical converter test benches provide some testing solutions, but they still have certain shortcomings and limitations, mainly in the following aspects: (1) Regarding the dynamic and static testing of electro-mechanical converters. The paper "Experimental Study and Simulation Analysis on Electromagnetic Characteristics and Dynamic Response of a New Miniature Digital Valve" published in Materials Science and Engineering in 2018 adopted a test method that isolates the influence of springs. The spring is replaced with a guide rod connected to the valve core, and the electromagnetic force of the valve is transmitted from the valve core to the force sensor of the test platform. The test platform can provide different drive signals to measure the characteristics of the electromagnetic force of the miniature valve under different working air gaps and different currents. However, its experimental setup has a relatively simple test mode, mainly completing the static characteristic test of the electro-mechanical converter.

[0004] (2) Regarding the acquisition of characteristic signals in experiments. The paper "Optical Measurement of Opening Characteristics of High-Speed ​​Solenoid Valves," published in the Journal of Zhejiang University, Vol. 54, No. 1, 2020, describes the testing principle using a laser displacement sensor. This system includes two main functional modules: valve core laser ranging and solenoid valve measurement and control. The valve core laser ranging module consists of a solenoid valve, a PMMA block, a valve block and mounting base, a laser displacement sensor and mounting base, all mounted on an optical flat plate. It can synchronously measure the valve core displacement, excitation circuit voltage and current, and control signals during the opening and closing process of the solenoid valve. However, its function is relatively simple, mainly completing the measurement of valve core displacement.

[0005] (3) Regarding research on multi-parameter adjustment. Chinese Patent Application No. 201510054131.2 discloses a proportional electromagnet dynamic and static performance testing device, which mainly includes a base plate, a static performance testing mechanism mounted on the base plate, a dynamic performance testing mechanism mounted on the base plate, and a first actuator bracket and a second actuator bracket mounted on the base plate. The proportional electromagnet under test is mounted on the first actuator bracket and the second actuator bracket. The static performance testing mechanism is used to test the static performance of the proportional electromagnet under test, and the dynamic performance testing mechanism is used to test the dynamic performance of the proportional electromagnet under test. It has the advantage of being able to test both the static and dynamic performance of the proportional electromagnet by combining an industrial control computer, a multi-functional data acquisition card, etc. However, the test parameters that can be adjusted are relatively limited, and it mainly completes the dynamic and static performance test under the condition of a fixed number of coil turns. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a multi-parameter adjustable electromechanical converter dynamic and static characteristic testing platform that is flexible in use, simple in operation, and highly efficient in testing.

[0007] This invention is implemented using the following scheme: a multi-parameter adjustable electro-mechanical converter dynamic and static characteristic testing platform, comprising an adjustable electro-mechanical converter, a preload adjustment device, and a tension / compression sensor arranged sequentially from left to right. The adjustable electro-mechanical converter consists of an adjustable coil assembly and an air gap adjustment device. The preload adjustment device has a limiting sleeve in the middle, and an adjustable stiffness composite spring is provided inside the limiting sleeve. A first push rod passes through the left end of the preload adjustment device, and a second push rod passes through the right end. The left and right ends of the first push rod are respectively connected to the right end of the adjustable electro-mechanical converter and the left end of the limiting sleeve. The left and right ends of the second push rod are respectively connected to the right end of the limiting sleeve and the left end of the tension / compression sensor.

[0008] Furthermore, it also includes a guide rail located at the bottom, on which the adjustable coil assembly, preload adjustment device and tension / compression sensor are respectively mounted on translation slides a, b, and c, which are slidably connected to the guide rail.

[0009] Furthermore, the limiting sleeve includes a fixed end and a movable end, wherein the fixed end of the limiting sleeve has a protrusion on the outer side of one end and a thread on the other end; the movable end of the limiting sleeve has a first groove that can engage with the first protrusion after rotation.

[0010] Furthermore, the adjustable coil assembly includes a housing and a coil frame located inside the housing. The left end of the housing has a first arc-shaped groove arranged at an angle, and the right end of the housing has a positioning base for pressing the coil frame. The left end of the coil frame has a second arc-shaped groove corresponding to the first arc-shaped groove. The coil frame is wound with multiple layers of coils with different numbers of turns. An insulating layer is provided between two adjacent layers of coils. The left end face of the housing is hinged with a first spring pressure plate and a second spring pressure plate that pass through the first arc-shaped groove and the second arc-shaped groove and contact the left end of the coil.

[0011] Furthermore, the air gap adjustment device includes a moving iron core, a stationary iron core, a push rod, a first L-shaped bracket, and a second L-shaped bracket. The moving iron core is placed inside the coil frame and abuts against the left end of the housing. The adjustable coil assembly is installed on the first L-shaped bracket. The right end of the stationary iron core is fixedly connected to the second L-shaped bracket, and the left end extends into the coil frame and is close to the moving iron core. The push rod passes through the middle of the stationary iron core, and the left and right ends of the push rod abut against the moving iron core and the first push rod, respectively.

[0012] Furthermore, the preload adjustment device includes a U-shaped bracket, with linear bearings connected to both sides of the U-shaped bracket. The first push rod passes through the linear bearing on the left side and its right end is connected to a T-shaped nut. The small end of the T-shaped nut is threaded to the left end of the limiting sleeve. The second push rod passes through the linear bearing on the right side.

[0013] Furthermore, the adjustable stiffness composite spring includes a large spring, a medium spring, and a small spring arranged sequentially from the outside to the inside. The right end of the large spring is sleeved on top of the right end of the large spring. The right end of the medium spring is sleeved inside the right end of the large spring. The right end of the medium spring is sleeved on top of the right end of the medium spring. The right part of the small spring is located inside the right end of the medium spring. The left end of the medium spring is sleeved on top of the left end of the medium spring. The left end of the medium spring is sleeved on top of the left end of the small spring. The left end of the small spring is sleeved on top of the left end of the small spring. The right end of the large spring has a second protrusion inside. The left end of the medium spring has a groove on the outside that can engage with the second protrusion after rotation. The right end of the medium spring has a third protrusion inside. The left end of the small spring has a third groove on the outside that can engage with the third protrusion after rotation.

[0014] Furthermore, it also includes an eddy current sensor and a current sensor. The eddy current sensor includes a fixed end and a movable end, with the movable end connected to the first push rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) Regarding the test mode of electro-mechanical converter, a limiting shell device was designed to realize the switching between two test modes of static test and dynamic test of the experimental platform, which improved the overall performance of the experimental platform and the efficiency of the test, and provided a more integrated test device for verifying and improving the simulation model. (2) Regarding the development of electro-mechanical converters, the influence of different parameters on electro-mechanical converters was studied. Adjustable coil assembly, air gap adjustment device, adjustable stiffness composite spring assembly and preload adjustment device were designed. This allows the study to explore the influence of coil, air gap, spring stiffness and preload on the performance of electro-mechanical converters, providing necessary hardware support for the development of electro-mechanical converters.

[0016] (3) Regarding the parameter adjustment accuracy, a translation slide and a T-nut are set up to work with a tension and compression sensor. A micrometer is used to carry an air gap adjustment device to ensure that the adjustment accuracy of the small air gap range is within 0.001mm. The T-nut is used to work with a tension and compression sensor to make the preload visible and read directly, which improves its accuracy and meets the requirements of high precision in small scale.

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0018] Figure 1 This is a front view of the overall assembly of the test bench according to an embodiment of the present invention; Figure 2 This is an assembly view of the limiting shell according to an embodiment of the present invention; Figure 3 This is a sectional view of the limiting shell according to an embodiment of the present invention; Figure 4 This is an exploded view of the adjustable coil assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the housing of the adjustable coil assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the coil frame of the adjustable coil assembly according to an embodiment of the present invention; Figure 7 This is an exploded view of the air gap adjustment device according to an embodiment of the present invention; Figure 8 This is an exploded view of the preload adjustment device according to an embodiment of the present invention; Figure 9 This is an exploded view of an adjustable stiffness composite spring according to an embodiment of the present invention; Figure 10 This is an assembly view of the right end sleeve of the large spring and the left end sleeve of the middle spring of the adjustable stiffness composite spring according to an embodiment of the present invention. Figure 11 This is a cross-sectional view of the assembly of the right end sleeve of the large spring and the left end sleeve of the middle spring of the adjustable stiffness composite spring according to an embodiment of the present invention. Figure 12 This is a view of the left end sleeve of the adjustable stiffness composite spring according to an embodiment of the present invention. Figure 13This is an assembly view of the right end sleeve of the middle spring and the left end sleeve of the small spring in an embodiment of the adjustable stiffness composite spring of the present invention. Figure 14 This is a cross-sectional view of the assembly of the right end sleeve of the middle spring and the left end sleeve of the small spring in an embodiment of the adjustable stiffness composite spring of the present invention. Figure 15 This is a view of the left end of the small spring sleeve of the adjustable stiffness composite spring according to an embodiment of the present invention; Explanation of the labels in the diagram: 100, guide rail; 200, translation slide a; 300, adjustable coil assembly; 400, first push rod; 500, air gap adjustment device; 600, preload adjustment device; 700, limiting sleeve; 800, adjustable stiffness composite spring; 900, second push rod; 1000, tension / compression sensor; 1100, translation slide c; 1200, current sensor; 1300, eddy current sensor fixed end; 1400, eddy current sensor moving end; 1500, translation slide b; 1600, energized wire; 301, positioning base; 302, coil; 303, insulation layer; 30 4. Coil frame; 305. Housing; 306. First spring pressure plate; 307. Second spring pressure plate; 501. First L-shaped bracket; 502. Second L-shaped bracket; 503. Moving iron core; 504. Stationary iron core; 505. Top rod; 506. Fixed platform; 601. Linear bearing; 602. T-nut; 603. U-shaped bracket; 701. Fixed end of limiting housing; 702. Moving end of limiting housing; 801. Small spring; 802. Middle spring; 803. Left end sleeve of small spring; 804. Right end sleeve of middle spring; 805. Large spring; 806. Left end sleeve of middle spring; 807. Right end sleeve of large spring. Detailed Implementation

[0019] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] like Figures 1-15As shown, a test bench for testing the dynamic and static characteristics of a multi-parameter adjustable electro-mechanical converter is characterized by comprising, from left to right, an adjustable electro-mechanical converter, a preload adjustment device 600, and a tension / compression sensor 1000. The adjustable electro-mechanical converter consists of an adjustable coil assembly 300 and an air gap adjustment device 500. The adjustable coil assembly and the air gap adjustment device are on the same axis and cooperate to generate electromagnetic force. The preload adjustment device 600 has a limiting sleeve 700 in the middle, and the limiting sleeve 700 has an adjustable stiffness composite spring 800 inside. A first push rod 400 passes through the left end of the preload adjustment device 600, and a second push rod 900 passes through the right end. The left and right ends of the first push rod 400 are respectively connected to the right end of the adjustable electro-mechanical converter and the left end of the limiting sleeve 700. The left and right ends of the second push rod 900 are respectively connected to the right end of the limiting sleeve 700 and the left end of the tension / compression sensor 1000. The experimental platform generates electromagnetic force through an adjustable electromechanical converter to drive an adjustable composite spring assembly, causing the adjustable composite spring assembly to compress and provide a restoring force. The data acquisition sensor assembly (comprising an eddy current sensor, a tension / compression sensor, a current sensor, a data acquisition card, and a PC) performs dynamic and static characteristic tests on the electromechanical sensor by collecting displacement, electromagnetic force, and coil current.

[0022] This invention achieves coil turn adjustment through an adjustable coil assembly; it implements high-precision air gap adjustment through an air gap adjustment structure; it utilizes a limiting shell structure to switch between static and dynamic testing modes on the experimental platform; it employs an adjustable stiffness composite spring to adjust spring stiffness; and it employs a preload adjustment mechanism to adjust preload. This invention integrates both static and dynamic testing modes, enabling multiple testing modes, adjustable parameters, and high flexibility, thereby improving the overall functionality, testing efficiency, accuracy, and ease of operation of the equipment.

[0023] In this embodiment, a guide rail is also included at the bottom. The adjustable coil assembly 300, the preload adjustment device 600 and the tension / compression sensor 1000 are respectively mounted on the translation slides a200, b1500 and c1100 that are slidably connected to the guide rail.

[0024] In this embodiment, the limiting sleeve includes a fixed end 701 and a movable end 702. The fixed end 701 has a protrusion 701b on one side and a thread 701a on the other. The movable end 702 has a first groove 702a that engages with the protrusion 701b after rotation. When the movable end 702 and the fixed end 701 rotate and lock together, an adjustable composite spring presses, engaging the first push rod 100 and the second push rod 900, allowing for static testing. When the movable end 702 and the fixed end 701 rotate and separate, the first push rod 100 and the second push rod 900 disconnect, allowing for dynamic testing.

[0025] In this embodiment, the adjustable coil assembly includes a housing 305 and a coil frame 304 located inside the housing 305. The left end of the housing 305 has a first arc-shaped groove 305a arranged at an angle, and the right end of the housing 305 has an opening for a positioning base 301 that presses against the coil frame 304. The left end of the coil frame 304 has a second arc-shaped groove 304a corresponding to the first arc-shaped groove 305a. Multiple layers of coils 302 with different numbers of turns are wound on the coil frame 304. An insulating layer 303 is provided between adjacent layers of coils. The insulating layer 303 and the coils 302 form a test coil. Each layer of enameled wire is isolated using a high-temperature resistant insulating layer. A coil passing through the first arc-shaped groove and the second arc-shaped groove 304a is hinged to the left end face of the housing. The first spring plate 306 and the second spring plate 307, which are in contact with the left end of the coil after the two arc-shaped grooves, are hinged at the center of the first arc-shaped groove. By swinging the first spring plate 306 and the second spring plate 307, they can make contact with the left end of the coil of different layers. The coil is wound with enameled wire, and the surface of the leftmost turn of each coil is scraped or polished so that the copper wire inside the leftmost turn of the coil makes contact with the spring plate and conducts electricity. The first spring plate 306 and the second spring plate 307 can swing around the hinge point. By swinging, the first spring plate 306 and the second spring plate 307 can make contact with the left end of the coil of different layers, thereby realizing the adjustment of the number of turns.

[0026] The adjustment method for the number of turns of the adjustable coil assembly is as follows: (1) Rotate the first spring pressure plate to the target position and fix it; (2) Rotate the second spring pressure plate to the other target position of the coil and fix it; When the first and second spring pressure plates are placed on the outermost and innermost layers of the coil, respectively, the maximum number of turns within the adjustment range can be obtained; when the first and second spring pressure plates are placed on the innermost and second innermost layers of the coil, respectively, the minimum number of turns within the adjustment range can be obtained; when the first and second spring pressure plates are placed in any position other than those mentioned above, any number of turns within the range between the maximum and minimum number of turns can be obtained.

[0027] In this embodiment, the air gap adjustment device includes a moving iron core 503, a stationary iron core 504, a push rod 505, a first L-shaped bracket 501, and a second L-shaped bracket 502. The moving iron core 503 is placed inside the coil frame 304 and abuts against the left end of the housing 305. The adjustable coil assembly is mounted on the first L-shaped bracket 501. The right end of the stationary iron core 504 is fixedly connected to the second L-shaped bracket 502, and the left end extends into the coil frame 304 and is close to the moving iron core 503. The second L-shaped bracket 502 is placed on a fixed platform 506. The push rod 505 passes through the middle of the stationary iron core 504, and its left and right ends abut against the moving iron core 503 and the first push rod 400, respectively. When the adjustable coil assembly is energized, it generates a magnetic field that causes an electromagnetic force to attract the moving iron core 503 and the stationary iron core 504, and the moving iron core 503 pushes the push rod 505 to move.

[0028] In this embodiment, the preload adjustment device includes a U-shaped bracket 603, with linear bearings 601 connected to both sides of the U-shaped bracket 603. The first push rod 400 passes through the left linear bearing 601 and its right end is connected to a T-nut 602. The small end of the T-nut 602 is threaded to the left end of the limiting housing 700. The second push rod passes through the right linear bearing 601. One end of the first push rod 500 is a smooth rod that passes through the linear bearing 601 and engages with the push rod 505. The other end is threaded and connected to the T-nut 602. The small end of the T-nut 602 is threaded to connect with the fixed end 709 of the limiting housing. The T-nut 602 adjusts the compression of the adjustable stiffness composite spring, thereby adjusting the preload.

[0029] In this embodiment, the adjustable stiffness composite spring includes a large spring 805, a middle spring 802, and a small spring 801 arranged sequentially from the outside in. The right end of the large spring is sleeved on a large spring right end sleeve 807. Inside the large spring right end sleeve 807, a middle spring right end sleeve 804 is provided. The right end of the middle spring 802 is sleeved on the middle spring right end sleeve 804. The right part of the small spring 801 is located inside the middle spring right end sleeve 804. The left end of the middle spring 802 is sleeved on a middle spring left end sleeve 806. Inside the middle spring left end sleeve 806, a small spring left end sleeve 803 is provided. 3. The outer sleeve is located on the left side of the small spring 801; the inner side of the right end sleeve 807 of the large spring is provided with a second protrusion 807a; the outer side of the left end sleeve 806 of the middle spring is provided with a groove 806a that can engage with the second protrusion 807a after rotation; the inner side of the right end sleeve 804 of the middle spring is provided with a third protrusion 804a; the outer side of the left end sleeve 803 of the small spring is provided with a third groove 804a that can engage with the third protrusion 804a after rotation; the end face of the left end sleeve 806 of the middle spring is provided with two adjustment holes 806b; the end face of the front end sleeve 804 of the middle spring is provided with two adjustment holes 804b.

[0030] The stiffness of the small spring 801 is K1, the stiffness of the medium spring 802 is K2, and the stiffness of the large spring 805 is K3. The large spring 805 with stiffness K3 has a medium spring 802 with stiffness K2 inside it. The right end of the large spring is provided with a right end sleeve 807 between the two, and the left end of the medium spring is provided with a left end sleeve 806 between the two. The medium spring 802 with stiffness K2 has a small spring 801 with stiffness K1 inside it. The right end of the medium spring is provided with a right end sleeve 804 between the two, and the left end of the small spring is provided with a left end sleeve 80 between the two.

[0031] The adjustment method for the stiffness value K of the adjustable stiffness spring assembly is as follows: (1) Rotate the front outer limit shell and the rear outer limit shell of the spring to disconnect them; (2) The left end sleeve of the rotating small spring is jammed or disconnected from the right end sleeve of the middle spring; (3) During rotation, the left end sleeve of the spring is jammed or disconnected from the right end sleeve of the large spring; When the rear sleeve of the small spring is locked to the front sleeve of the middle spring, and the rear sleeve of the middle spring is locked to the front sleeve of the large spring, the stiffness can be obtained. Spring assembly; when the rear sleeve of the small spring is locked to the front sleeve of the middle spring, and the rear sleeve of the middle spring is disconnected from the front sleeve of the large spring, the stiffness can be obtained. Spring assembly; when the rear sleeve of the small spring is disconnected from the front sleeve of the middle spring, and the rear sleeve of the middle spring is jammed with the front sleeve of the large spring, the stiffness can be obtained. Spring assembly; when the rear sleeve of the small spring is disconnected from the front sleeve of the middle spring, and the rear sleeve of the middle spring is disconnected from the front sleeve of the large spring, the stiffness can be obtained. Spring assembly.

[0032] In this embodiment, an eddy current sensor and a current sensor 1200 are also included. The eddy current sensor includes a fixed end 1300 and a movable end 1400. The movable end 1400 is connected to the first push rod 400, and the fixed end 1300 is placed on the U-shaped bracket 603. The pressure sensor 1000 is mounted on the double L-shaped bracket and is threadedly connected to the right end of the second push rod 900. The current sensor 1200 is placed behind the adjustable coil assembly and is connected to the first spring pressure plate 306 and the second spring pressure plate 307 through the measuring wire 1600.

[0033] This invention addresses the testing modes of electro-mechanical converters by designing a limiting housing device that enables switching between static and dynamic testing modes on the experimental platform. This improves the overall performance of the platform and increases testing efficiency. It also provides a more integrated testing device for verifying and refining simulation models.

[0034] This invention addresses the development of electro-mechanical converters by studying the influence of different parameters on the converter. It designs an adjustable coil assembly, an air gap adjustment device, an adjustable stiffness composite spring assembly, and a preload adjustment device. This allows for the investigation of the effects of coil, air gap, spring stiffness, and preload on the performance of the electro-mechanical converter, providing necessary hardware support for its development.

[0035] This invention addresses parameter adjustment accuracy by incorporating a micrometer translation slide and a knurled stepped nut in conjunction with a tension / compression sensor. The micrometer, equipped with an air gap adjustment device, ensures adjustment accuracy within 0.001mm in the smallest air gap range. The knurled stepped nut, combined with the tension / compression sensor, makes the preload force visible and allows for direct reading, thus improving accuracy. This meets the requirements for high precision at small scales.

[0036] In conjunction with the above specific embodiments, the specific implementation steps of the multi-parameter adjustable electro-mechanical converter dynamic and static characteristic testing platform involved in this invention will be further described in detail: Step S1: Move the translation slide a200 to press the adjustable coil assembly against the stationary iron core 504, and adjust the initial air gap to zero; Step S2: Move the translation slide a200, accurately read the scale, set the required air gap, and fix the translation slide a200; Step S3: Move the translation slide b1500 to press the adjustable composite spring assembly against the top rod; When conducting static test experiments on electromechanical converters with different coil turns and different air gaps, the following adjustment steps are required: Step Q1: Rotate the moving end 800 of the limiting sleeve to lock it into the fixed end 700 of the limiting sleeve, thus pressing the adjustable stiffness composite spring assembly. Step Q2: Rotate the T-nut 602 to move the clamped adjustable stiffness composite spring assembly forward; Step Q3: Move the translation slide c1100 so that the cross pin 900 on the tension / compression sensor 1000 abuts against the long screw 500; Step Q4: Adjust the moving end 1400 of the eddy current sensor to within the measurable displacement range, and measure the valve core displacement. Step Q5: Rotate the first spring pressure plate 306 to any position and fix it, rotate the second spring pressure plate 307 to another position of the coil and fix it, and adjust the appropriate number of coil turns; Step Q6: Drive the adjustable electromechanical converter to collect displacement, force and coil current signals for static characteristic analysis; When conducting dynamic testing experiments on electromechanical converters with different coil turns, air gaps, spring stiffnesses, and preloads, the following adjustment steps are required: Step Q1: Rotate the moving end 800 of the limiting sleeve to disconnect it from the fixed end 700 of the limiting sleeve, and release the adjustable stiffness composite spring. Step Q2: Move the translation slide c1100 so that the second push rod 900 on the tension / compression sensor 1000 abuts against the adjustable stiffness composite spring; Step Q3: Adjust the moving end 1400 of the eddy current sensor to within the measurable displacement range, and measure the valve core displacement. Step Q4: Adjust the adjustable stiffness composite spring and select the composite spring stiffness; Step Q5: Rotate the T-nut 602 to adjust the compression of the adjustable stiffness composite spring, and determine the preload magnitude from the signal collected by the tension / compression sensor 1000; Step Q6: Rotate the first spring pressure plate 306 to any position and fix it, rotate the second spring pressure plate 307 to another position of the coil and fix it, and adjust the appropriate number of coil turns; Step Q7: Drive the adjustable electromechanical converter to collect displacement, force and coil current signals for static characteristic analysis.

[0037] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0038] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0039] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0040] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A test bench for testing the dynamic and static characteristics of a multi-parameter adjustable electro-mechanical converter, characterized in that: The system includes, from left to right, an adjustable electro-mechanical converter, a preload adjustment device, and a tension / compression sensor. The adjustable electro-mechanical converter consists of an adjustable coil assembly and an air gap adjustment device. The preload adjustment device has a limiting sleeve in the middle, and an adjustable stiffness composite spring is installed inside the limiting sleeve. A first push rod passes through the left end of the preload adjustment device, and a second push rod passes through the right end. The left and right ends of the first push rod are respectively connected to the right end of the adjustable electro-mechanical converter and the left end of the limiting sleeve. The left and right ends of the second push rod are respectively connected to the right end of the adjustable electro-mechanical converter and the left end of the limiting sleeve. The device aligns with the right end of the limiting housing and the left end of the tension / compression sensor. The limiting housing includes a fixed end and a movable end. The fixed end has a protrusion on one outer side and a threaded end on the other. The movable end has a first groove that engages with the first protrusion after rotation. When the movable end and the fixed end rotate and lock together, an adjustable composite spring presses, engaging the first push rod and the second push rod, allowing for static testing. When the movable end and the fixed end rotate and separate... The first push rod is disconnected from the second push rod, allowing for dynamic testing. The adjustable coil assembly includes a housing and a coil frame inside the housing. The left end of the housing has a first arc-shaped groove arranged at an angle, and the right end of the housing has a positioning base for pressing the coil frame. The left end of the coil frame has a second arc-shaped groove corresponding to the first arc-shaped groove. The coil frame is wound with multiple layers of coils with different numbers of turns, and an insulating layer is provided between adjacent layers of coils. The left end face of the housing is hinged with a first spring plate and a second spring plate that pass through the first and second arc-shaped grooves and contact the left end of the coil. The first and second spring plates are hinged at the center of the first arc-shaped groove. By swinging the first and second spring plates, contact with the left end of coils of different layers can be achieved. The preload adjustment device includes a U-shaped bracket with linear bearings connected to both sides. The first push rod passes through the linear bearing on the left and its right end is connected to a T-shaped nut. The small end of the T-shaped nut is threaded to the left end of the limiting housing. The second push rod passes through the linear bearing on the right.

2. The multi-parameter adjustable electro-mechanical converter dynamic and static characteristic testing platform according to claim 1, characterized in that: It also includes a guide rail located at the bottom, and the adjustable coil assembly, preload adjustment device and tension / compression sensor are respectively mounted on translation slides a, b and c that are slidably connected to the guide rail.

3. The multi-parameter adjustable electro-mechanical converter dynamic and static characteristic test bench according to claim 1, characterized in that: The air gap adjustment device includes a moving iron core, a stationary iron core, a push rod, a first L-shaped bracket, and a second L-shaped bracket. The moving iron core is placed inside the coil frame and abuts against the left end of the housing. The adjustable coil assembly is installed on the first L-shaped bracket. The right end of the stationary iron core is fixedly connected to the second L-shaped bracket, and the left end extends into the coil frame and is close to the moving iron core. The push rod passes through the middle of the stationary iron core, and the left and right ends of the push rod abut against the moving iron core and the first push rod, respectively.

4. The multi-parameter adjustable electro-mechanical converter dynamic and static characteristic test bench according to claim 1, characterized in that: The adjustable stiffness composite spring includes a large spring, a medium spring, and a small spring arranged sequentially from the outside to the inside. The right end of the large spring is sleeved on top of the right end of the large spring. Inside the right end sleeve of the large spring is the right end sleeve of the medium spring. The right end sleeve of the medium spring is sleeved on top of the right end sleeve of the medium spring. The right part of the small spring is located inside the right end sleeve of the medium spring. The left end sleeve of the medium spring is sleeved on top of the left end sleeve of the medium spring. Inside the left end sleeve of the medium spring is the left end sleeve of the small spring. The left end sleeve of the small spring is sleeved on the outside of the left end of the small spring. Inside the right end sleeve of the large spring is a second protrusion. The outside of the left end sleeve of the medium spring is a groove that can engage with the second protrusion after rotation. Inside the right end sleeve of the medium spring is a third protrusion. The outside of the left end sleeve of the small spring is a third groove that can engage with the third protrusion after rotation.

5. The multi-parameter adjustable electro-mechanical converter dynamic and static characteristic test bench according to claim 1, characterized in that: It also includes an eddy current sensor and a current sensor. The eddy current sensor includes a fixed end and a movable end, with the movable end connected to the first push rod.

Images