CN214749445U - Effective volume elastic modulus detection device of hydraulic oil - Google Patents
Effective volume elastic modulus detection device of hydraulic oil Download PDFInfo
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- CN214749445U CN214749445U CN202120521492.4U CN202120521492U CN214749445U CN 214749445 U CN214749445 U CN 214749445U CN 202120521492 U CN202120521492 U CN 202120521492U CN 214749445 U CN214749445 U CN 214749445U
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- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 239000003921 oil Substances 0.000 claims abstract description 72
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000011218 segmentation Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The application provides a hydraulic oil effective volume elastic modulus detection device which comprises an oil inlet unit, a servo loading device, a test cavity unit and an oil outlet unit, wherein the servo loading device comprises a displacement sensor, a loading rod, a servo motor and a support, and the top and bottom ends of side plates of the support are connected through a support top plate and a support bottom plate; the servo motor is arranged at the top end of the bracket; the loading rod penetrates through the top end of the support and is connected with the servo motor, and the other end of the loading rod is connected with the test cavity unit; the displacement sensors are respectively arranged on the bracket and the loading rod; the test cavity unit is arranged at the bottom of the loading rod; the oil inlet unit and the oil outlet unit are respectively communicated with the test cavity unit. Through the utility model discloses well servo loading device loads in succession, when low pressure district or higher pressure segmentation measurement, adopts high-precision grating chi displacement sensor to measure, can be in time continuous accurate dynamic incessant measurement, has improved measuring resolution ratio and reliability, the device simple structure, the operation of being convenient for.
Description
Technical Field
The application relates to the technical field of hydraulic oil elastic modulus detection, in particular to a hydraulic oil effective volume elastic modulus detection device.
Background
At present, a hydraulic system is widely applied to various mechanical equipment, the effective volume elastic modulus of hydraulic oil used as a working medium represents the rigidity of the system, and the hydraulic system is one of important parameters influencing the dynamic performance of the system. Due to its compressibility, oil is often considered a spring in a hydraulic system. The elastic modulus of the oil is a dynamic quantity, has a plurality of influence factors and complicated change, and is a soft parameter which is difficult to determine. How to accurately obtain the elastic modulus parameters is always a hotspot of basic research in the hydraulic field, and has important significance on the design and analysis of hydraulic systems, particularly systems with high requirements on dynamic response and stability.
The elastic modulus of hydraulic oil is taken as an important physical parameter related research of a hydraulic control system, and is long-paid attention by scholars at home and abroad, a great deal of work is carried out, and important progress is achieved. In the prior art, researchers have tried to measure the bulk modulus of elasticity of oil liquid and change the pressure to obtain the change characteristic of the modulus of elasticity.
For example: CN206057097U discloses a hydraulic oil effective volume elastic modulus measuring machine, which is a measuring machine capable of measuring the strain of unit volume of hydraulic oil under a pressurized state through a grating arranged at the left end of a mounting column, thereby calculating the elastic modulus of the hydraulic oil. In addition, CNCN206845590U discloses a device for detecting the bulk modulus of hydraulic oil, which can record the pressure change value and the rotation angle of the forcing screw by rotating the forcing screw, and can quickly calculate the bulk modulus of hydraulic oil by combining the diameter of the pressurizing piston. However, both the two elastic modulus measuring machines are mechanical structures, which cannot meet the requirement of high-precision measurement and cannot continuously and accurately measure the dynamic state in time.
SUMMERY OF THE UTILITY MODEL
The purpose of this application lies in: when the effective volume elastic modulus of hydraulic oil is detected, the conventional hydraulic oil effective volume elastic modulus detection device has the advantages of single measurement mode, dynamic uninterrupted measurement which cannot be timely, continuously and accurately performed, limited application range, incapability of being simultaneously suitable for low-pressure area detection and higher pressure subdivision measurement, poor measurement continuity and reliability, and capability of improving the resolution and reliability of the simultaneous measurement.
The technical scheme of this application provides an effective bulk modulus detection device of hydraulic oil, and the device includes: an oil inlet unit, a servo loading device, a test cavity unit and an oil outlet unit,
the oil inlet unit comprises an electromagnetic directional valve and an oil inlet electromagnetic ball valve which are sequentially connected through an oil inlet pipeline, and the oil inlet unit is communicated with the upper side wall of the closed test cavity unit through the oil inlet pipeline;
the servo loading device comprises a displacement sensor, a loading rod, a servo motor and a bracket,
the support comprises two identical vertical opposite and parallel side plates, a support top plate and a support bottom plate, wherein two ends of the support top plate are respectively connected with the top ends of the two side plates, and two ends of the support bottom plate are respectively connected with the bottom ends of the two side plates;
the servo motor is arranged at the top end of the bracket; the loading rod penetrates through the top end of the support and is connected with the servo motor at the top end, and the other end of the loading rod is connected with the test cavity unit;
the displacement sensors are respectively arranged on the bracket and the loading rod;
the test cavity unit is a closed cavity and is arranged at the bottom of the loading rod;
the oil outlet unit comprises an oil outlet electromagnetic ball valve which is connected with an oil outlet pipeline of the testing cavity unit, and the oil outlet electromagnetic ball valve is arranged along the oil outlet direction.
Further, the loading rod comprises an elastic coupling and a lead screw;
the elastic coupling is of a cylinder structure, is positioned at the upper part of the loading rod, and the upper part of the elastic coupling penetrates through the top plate of the bracket support to be connected with the bottom of the servo motor;
the lead screw is a threaded screw rod and is vertically arranged at the upper end of the support.
Furthermore, the test cavity unit is arranged between two side plates at the inner bottom end of the support 11, the top end of the test cavity unit is connected with the bottom end of the loading rod, and the bottom end of the test cavity unit is in contact with the upper surface of the bottom plate of the support 11.
Further, the displacement sensors are paired and arranged oppositely in the moving direction of the lead screw.
Further, the displacement sensor is a grating ruler displacement sensor, and the minimum displacement scale is 0.001 mm.
Further, the load lever further includes: a guide rail, a bearing, a slide block and a nut,
the sliding blocks are arranged on the inner walls of the side plates of the support in pairs and are movably connected with guide rails arranged on the inner walls of the side plates, the sliding blocks are fixedly connected with the flat plate respectively towards the side wall in the axial direction, nuts arranged on the lead screws are fixedly connected with the flat plate, and the nuts are movably connected with the thread sections of the lead screws.
Further, the guide rail is vertically arranged downwards along the inner side of the side plate.
Furthermore, the threaded section from the loading rod bottom plate to the flat plate is connected through a plurality of support rods.
Further, the elastic modulus detection device further comprises: a pressure sensor and a temperature sensor, wherein,
the pressure sensor and the temperature sensor are arranged in the testing cavity unit and are respectively connected with the display ends of the pressure sensor and the temperature sensor arranged on the outer side wall of the bracket through cables.
The beneficial effect of this application is:
(1) the device is applicable to the low pressure district and detects, and the effective volume modulus of elasticity of fluid is comparatively sensitive in the low pressure district, and is comparatively obvious along with the change of pressure, and this device is based on servo motor loading, and is all higher than hydraulic loading system to loading rod displacement, speed control's continuity and reliability, therefore this device can be better applied to the measurement of modulus of elasticity under the low pressure.
(2) Higher pressure subdivision
Based on the loading of the servo motor, the displacement control resolution and precision of the loading rod are greatly improved, and the oil pressure in the test cavity is determined by the displacement of the loading rod. Therefore, the displacement subdivision of the loading rod is proportional to the pressure subdivision of the oil in the test cavity.
(3) The measuring mode is various, dynamic uninterrupted measurement which can be timely, continuous and accurate is achieved, the application range is wide, the device can be simultaneously suitable for low-pressure area detection and higher pressure subdivision measurement, the measuring continuity and the measuring reliability are improved, and the reliability is further improved when the measuring resolution is improved.
(4) By adopting the displacement sensor and the grating ruler displacement sensor, the precision can reach 0.001mm, and the detection precision of the effective volume elastic modulus of the hydraulic oil is improved.
(5) The whole device is simple in integral structure and convenient to operate.
Drawings
The advantages of the above and/or additional aspects of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic overall structure diagram of an effective bulk modulus detection device for hydraulic oil;
the device comprises an electromagnetic directional valve 1, an electromagnetic directional valve 2, a displacement sensor 3, an elastic coupling 4, a lead screw 5, a servo motor 6, a test cavity 7, a pressure sensor 8, a temperature sensor 9 and an electromagnetic ball valve. 10. Guide rail, 11, support, 13, bearing, 14, slider, 15, nut.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, the present embodiment provides a hydraulic oil effective bulk modulus detection apparatus, which includes: the oil inlet unit comprises an electromagnetic directional valve 1 and an oil inlet electromagnetic ball valve 91 which are sequentially connected through an oil inlet pipeline, the oil inlet pipeline is a high-pressure oil pipe, and an oil outlet port of the high-pressure oil pipe of the oil inlet unit is sealed and communicated with the upper side wall of the closed test cavity unit through the high-pressure oil inlet pipeline. And simultaneously starting a power switch, respectively starting the electromagnetic directional valve 1, the oil inlet electromagnetic ball valve 91 and the oil outlet electromagnetic ball valve 92, wherein the oil inlet electromagnetic ball valve 91 and the oil outlet electromagnetic ball valve 92 are controlled by the same power switch, and are simultaneously opened or closed, so that oil in the high-pressure oil pipe of the oil port unit flows into the testing cavity 6 in the testing cavity unit towards the direction of the closed testing cavity unit, when the flowing oil is full of the volume space of the testing cavity 6, the oil inlet electromagnetic ball valve 91 and the oil inlet electromagnetic ball valve 92 in the oil outlet unit can be simultaneously closed, and the oil outlet electromagnetic ball valve 92 is arranged in the oil outlet direction along the pipeline of the high-pressure oil pipe and is used for sealing the oil filled in the testing cavity 6.
In this embodiment, the servo loading device includes a displacement sensor 2, a loading rod, a servo motor 5, and a bracket 11, where the bracket 11 includes two identical, vertically opposite and parallel side plates, a bracket top plate and a bracket bottom plate, two ends of the bracket top plate are respectively connected with top ends of the two side plates, and two ends of the bracket bottom plate are respectively connected with bottom ends of the two side plates; the supporting frame structure of the servo loading device is formed, and the supporting frame structure can be made of metal steel or wood.
In this embodiment, as shown in fig. 1, the servo motor 5 is disposed at a middle position above the top end of the bracket 11, and the top end of the bracket 11 supports the servo motor 5; the loading rod penetrates through the top end of the support 11 and is connected with the servo motor 5 at the top end, the other end of the loading rod is connected with the test cavity unit through a piston loading pressing plate penetrating through the vertical inner wall of the test cavity 6, and the piston loading pressing plate at the top of the test cavity 6 is sealed and movably connected with the inner wall of the test cavity 6 in the vertical direction. The test chamber 6 may be a vertical cylinder or a vertical square column, where a circular end surface with an area S is used as a piston loading platen.
In this embodiment, the loading rod includes an elastic coupling 3 and a screw rod 4, the elastic coupling 3 is a cylindrical structure, the diameter of the elastic coupling 3 is slightly larger than that of the cylindrical screw rod 4, the elastic coupling 3 is located at the upper portion of the loading rod, the upper rotating shaft of the elastic coupling has a slightly smaller diameter, the upper rotating shaft of the elastic coupling 3 penetrates through the top plate of the upper bracket of the bracket 11, and the leakage position of the upper rotating shaft is coupled with the rotating shaft at the bottom of the servo motor 5. The lead screw 4 is a threaded screw rod and is vertically arranged at the upper end in the support 11.
As shown in fig. 1, the load lever further includes: guide rail 10, bearing 13, slider 14, nut 15, slider 14 sets up in pairs in the curb plate inner wall of support 11 and with the vertical direction swing joint from top to bottom of the guide rail 10 that curb plate inner wall set up, two sliders 14 respectively towards the lateral wall and a dull and stereotyped fixed connection of axial direction, the nut 15 that sets up on the lead screw 4 with dull and stereotyped fixed connection, and nut 15 with lead screw 4 screw thread section swing joint, nut 15 be used for with the dull and stereotyped structure fixed connection that two sliders 14 bottoms are connected, the dull and stereotyped structure that two sliders 14 bottoms are connected can reciprocate at lead screw 4 screw thread section.
In this embodiment, the guide rail 10 is provided with at least one rail vertically and downwardly along the inner side of each side plate, and the number of the rails of the guide rail 10 is set according to the magnitude of the pressure, the size of the inner side wall of the bracket 11 and the stability in the loading process.
In this embodiment, a fixing bracket for fixing the bearing is disposed on the inner wall of the top of the bracket 11, the bearing 13 is cylindrical and vertically disposed in the fixing bearing bracket on the top of the bracket 11, and the side wall of the bearing 13 is fixed to the fixing bearing bracket. The upper part of the bearing 13 is connected with the lower part of the elastic coupling 3 through a rotating shaft, and the lower part of the bearing is fixedly connected with the top end shaft of the lead screw 4.
In this embodiment, a plurality of vertical support rods are arranged between the thread section from the loading rod bottom plate to the flat plate, and the loading rod bottom plate and the flat plate are connected through the plurality of support rods.
In this embodiment, the displacement sensors are respectively disposed on the upper surfaces of the support 11 and the flat plate of the loading rod; the displacement sensors are arranged in pairs and oppositely along the up-down moving direction of the screw rod 4, the upper ends of the displacement sensors are arranged on the top inner wall of the support 11, and the lower ends of the displacement sensors are arranged at the corresponding positions of the upper flat plate in the vertical direction.
In this embodiment, the displacement sensor is a grating scale displacement sensor, and the minimum displacement scale is 0.001 mm.
In this embodiment, the test chamber unit is a closed test chamber 6, and is disposed at the bottom of the loading rod between the two side plates at the bottom end in the bracket 11, the top end of the test chamber unit is connected with the bottom end of the loading rod, and the bottom end of the test chamber unit is in contact with the upper surface of the bottom plate of the bracket 11.
In this embodiment, the elastic modulus detection apparatus further includes: pressure sensor 7 and temperature sensor 8, pressure sensor 7 with temperature sensor 8 all is current control's electronic sensor, pressure sensor 7 with temperature sensor 8 measuring end sets up in the test chamber unit, is connected with the display end that sets up pressure sensor 7 and temperature sensor 8 in support 11 lateral wall respectively through the cable, shows pressure and the temperature of surveying constantly surveying respectively.
When the oil liquid effective volume elastic modulus is sensitive in a low-pressure area and changes obviously along with the pressure, the oil liquid effective volume elastic modulus is sensitive in the low-pressure area when the displacement value is measured by the pressure sensor 7 and the temperature sensor 8 when the displacement value is measured by the grating ruler displacement sensor when the loading rod moves downwards for a certain displacement under the drive of the servo motor 5 and vertically moves downwards along the guide rail 10 by adopting the matching loading of the bearing 13, the sliding block 14 and the screw rod 4, the nut 15 is fixed on the flat plate, and the sliding block 14 is driven by the servo motor 5 to move downwards.
When higher pressure segmentation is measured, adopt and start elastic coupling 3 and nut 15 cooperation lead screw 4 segmentation loading, the displacement change is little this moment, based on the servo motor loading, makes loading rod displacement control resolution and precision obtain great promotion, and the oil hydraulic pressure in the test chamber is decided by the displacement of loading rod. Therefore, the displacement subdivision of the loading rod is proportional to the pressure subdivision of the oil in the test cavity.
Example 2
The embodiment also provides a method for detecting the effective bulk modulus of the hydraulic oil, and the basic principle of the method is that the pressure of a certain volume of oil in a closed container is changed according to the definition of the bulk modulus of the hydraulic oil to obtain the corresponding volume change, so that the bulk modulus of the hydraulic oil in the state is calculated. That is, for an oil having a volume "V", the volume change ". DELTA.V" at a pressure increase ". DELTA.P" is expressed as:
when elastic modulus is detected, firstly, the electromagnetic directional valve 1 of the oil inlet is operated to be conducted, hydraulic oil in the guide system enters the test cavity 6 through the electromagnetic ball valve 9 and flows out through the electromagnetic ball valve 9 of the oil outlet, and cyclic replacement of test oil is carried out. After oil is changed sufficiently, the electromagnetic directional valve 1 and the electromagnetic ball valve 9 are operated to be closed, and the test cavity 6 is kept in a sealed state. Then a compression test of the oil can be carried out, which allows to perform two measurements:
the embodiment provides a two-point measurement method for the effective bulk modulus of hydraulic oil, which specifically comprises the following steps:
And S is the contact area of the loading rod and oil in the test cavity 6 during compression, and the effective volume modulus value of the oil is calculated.
In the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The shapes of the various elements in the drawings are illustrative and do not preclude the existence of certain differences from the actual shapes, and the drawings are used for the purpose of illustrating the principles of the present application and are not intended to limit the present application.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the subject application without departing from the scope and spirit of the present application.
Claims (9)
1. A hydraulic oil effective volume elastic modulus detection device, the device includes: an oil inlet unit, a servo loading device, a test cavity unit and an oil outlet unit,
the oil inlet unit comprises an electromagnetic directional valve (1) and an oil inlet electromagnetic ball valve (91) which are sequentially connected through an oil inlet pipeline, and the oil inlet unit is communicated with the upper side wall of the closed test cavity unit through the oil inlet pipeline;
the servo loading device comprises a displacement sensor (2), a loading rod, a servo motor (5) and a bracket (11);
the support (11) comprises two identical vertical opposite and parallel side plates, a support top plate and a support bottom plate, wherein two ends of the support top plate are respectively connected with the top ends of the two side plates, and two ends of the support bottom plate are respectively connected with the bottom ends of the two side plates;
the servo motor (5) is arranged at the top end of the bracket (11); the loading rod penetrates through the top end of the support (11) and is connected with the servo motor (5) at the top end, and the other end of the loading rod is connected with the test cavity unit;
the displacement sensors are respectively arranged on the bracket (11) and the loading rod;
the test cavity unit is a closed cavity and is arranged at the bottom of the loading rod;
the oil outlet unit comprises an oil outlet electromagnetic ball valve (92) which is connected with an oil outlet pipeline of the testing cavity unit, and the oil outlet electromagnetic ball valve (92) is arranged along the oil outlet direction.
2. The hydraulic oil effective volume elastic modulus detection device as claimed in claim 1, wherein the loading rod comprises an elastic coupling (3) and a lead screw (4), the elastic coupling (3) is of a cylinder structure, the elastic coupling (3) is positioned at the upper part of the loading rod, and the upper part of the elastic coupling penetrates through a bracket (11) and a bracket top plate is connected with the bottom of the servo motor (5);
the lead screw (4) is a threaded screw rod and is vertically arranged at the upper end of the support (11).
3. The device for detecting the effective bulk modulus of elasticity of hydraulic oil according to claim 1, wherein the test chamber unit is disposed between two side plates at the bottom end of the bracket (11), the top end of the test chamber unit is connected to the bottom end of the loading rod, and the bottom end of the test chamber unit is in contact with the upper surface of the bottom plate of the bracket (11).
4. The hydraulic oil effective bulk modulus detection device according to claim 1, wherein the displacement sensors are provided in pairs and are opposed to each other in the moving direction of the lead screw (4).
5. The device for detecting the effective bulk modulus of elasticity of hydraulic oil according to claim 4, wherein the displacement sensor is a grating ruler displacement sensor, and the minimum displacement scale is (0) · (001) mm.
6. The device for detecting the effective bulk modulus of elasticity of hydraulic oil according to claim 1, wherein the loading rod further comprises a guide rail (10), a bearing (13), a slider (14) and a nut (15),
the sliding blocks (14) are arranged on the inner walls of the side plates of the support (11) in pairs and are movably connected with guide rails (10) arranged on the inner walls of the side plates, the sliding blocks (14) are fixedly connected with the flat plate towards the side wall of the axial direction respectively, nuts (15) arranged on the lead screws (4) are fixedly connected with the flat plate, and the nuts (15) are movably connected with thread sections of the lead screws (4).
7. The hydraulic oil effective volume elastic modulus detection device according to claim 6, characterized in that the guide rail (10) is vertically arranged downwards along the inner side of the side plate.
8. The apparatus of claim 1, wherein the threaded section from the bottom plate of the load bar to the flat plate is connected by a plurality of support bars.
9. The hydraulic oil effective volume elastic modulus detection device of claim 1, wherein the elastic modulus detection device further comprises: a pressure sensor (7) and a temperature sensor (8),
the pressure sensor (7) and the temperature sensor (8) are arranged in the testing cavity unit and are respectively connected with the display ends of the pressure sensor (7) and the temperature sensor (8) arranged on the outer side wall of the bracket (11) through cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120521492.4U CN214749445U (en) | 2021-03-12 | 2021-03-12 | Effective volume elastic modulus detection device of hydraulic oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120521492.4U CN214749445U (en) | 2021-03-12 | 2021-03-12 | Effective volume elastic modulus detection device of hydraulic oil |
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| CN214749445U true CN214749445U (en) | 2021-11-16 |
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| CN202120521492.4U Expired - Fee Related CN214749445U (en) | 2021-03-12 | 2021-03-12 | Effective volume elastic modulus detection device of hydraulic oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659550A (en) * | 2022-02-17 | 2022-06-24 | 贵州安吉华元科技发展有限公司 | Device for detecting electromagnetic force and displacement |
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2021
- 2021-03-12 CN CN202120521492.4U patent/CN214749445U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659550A (en) * | 2022-02-17 | 2022-06-24 | 贵州安吉华元科技发展有限公司 | Device for detecting electromagnetic force and displacement |
| CN114659550B (en) * | 2022-02-17 | 2024-01-26 | 贵州安吉华元科技发展有限公司 | Device for detecting electromagnetic force and displacement |
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