CN111257168B - Electrorheological property testing device and method - Google Patents
Electrorheological property testing device and method Download PDFInfo
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- CN111257168B CN111257168B CN202010124032.8A CN202010124032A CN111257168B CN 111257168 B CN111257168 B CN 111257168B CN 202010124032 A CN202010124032 A CN 202010124032A CN 111257168 B CN111257168 B CN 111257168B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
- G01N2011/0066—Determining flow properties indirectly by measuring other parameters of the system electrical properties
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Abstract
The invention relates to a device and a method for testing electrorheological property. The current transformation performance testing device comprises a first conductive flat plate, a second conductive flat plate and an energizing part. When the electrorheological property testing device is used for performing electrorheological property testing, the second conductive flat plate rotates. Because the second conductive flat plate is opposite to the first conductive flat plate, and the power adding part is positioned on one side of the second conductive flat plate, which is back to the first conductive flat plate, when the first conductive flat plate and the power adding part are respectively communicated with the positive electrode and the negative electrode of the power supply, an induction electric field is formed between the first conductive flat plate and the second conductive flat plate. Because the power-on part is not contacted with the second conductive flat plate, the current-variable performance testing device enables an electric field to be formed between the rotating second conductive flat plate and the fixed first conductive flat plate in a non-contact power-on mode, and the problems that a contact point is easy to wear, power supply is unstable and a test result is inaccurate caused by a traditional contact power-on method are solved.
Description
Technical Field
The invention relates to the technical field of electrorheological property testing, in particular to an electrorheological property testing device and method.
Background
The rotating shaft is a very widely used mechanical component, and charging a high-speed moving rotating body is a problem in the fields of industrial manufacturing and the like. The rheometer is a test device which is important to be applied in the scientific research field, the core part for realizing the electrorheological property test is composed of a rotatable flat plate (or called upper polar plate) and a relatively fixed flat plate (or called lower polar plate) which are driven by a rotating shaft, the upper polar plate is generally electrified by overlapping the rotating shaft with a metal wire, and an electric field is formed between the upper polar plate and the lower polar plate so as to test the electrorheological property of a sample between the upper polar plate and the lower polar plate. However, in the actual use process, because the speed of the rotating shaft is generally high during the test, the phenomenon of serious abrasion of the contact surface between the metal wire and the rotating shaft occurs, and the problems of unstable power supply, distorted test data and the like are caused.
Disclosure of Invention
Therefore, it is necessary to provide an electrorheological behavior testing device with stable power supply and accurate test data for solving the problems of unstable power supply and distorted test data when the electrorheological behavior of a test sample is tested by a traditional method.
The embodiment of the application provides an electrorheological properties testing arrangement, includes:
a first conductive plate;
a second conductive plate opposite the first conductive plate, the second conductive plate being rotatable; and
the second conductive flat plate is arranged on the first conductive flat plate, a gap is formed between the second conductive flat plate and the charging portion, a dielectric medium is arranged in the gap, and the portion, in contact with the second conductive flat plate, of the dielectric medium is gas or liquid.
When the current performance testing device is used for testing the current performance, the second conductive flat plate rotates. Because the second conductive flat plate is opposite to the first conductive flat plate, and the power adding part is positioned on one side of the second conductive flat plate, which is back to the first conductive flat plate, when the first conductive flat plate and the power adding part are respectively communicated with the positive electrode and the negative electrode of the power supply, an induction electric field is formed between the first conductive flat plate and the second conductive flat plate. Because the power-on part is not in contact with the second conductive flat plate, an electric field is formed between the rotating second conductive flat plate and the fixed first conductive flat plate in a non-contact power-on mode, and the problems that a contact point is easy to wear, power supply is unstable and a test result is inaccurate caused by a traditional contact power-on method are solved. The method is simple and easy to implement, low in cost, simple and convenient in structure, convenient for large-scale popularization and high in practical value. Meanwhile, the method does not need to use liquid mercury and other conductive liquids, does not need to consider the problems of sealing, pollution and the like, and is green and environment-friendly. Furthermore, the part of the dielectric medium, which is in contact with the second conductive flat plate, is gas or liquid, so that the second conductive flat plate is not easy to wear when rotating, and the power supply stability and the accuracy of test data are improved.
In an embodiment, the current transformer performance testing apparatus further includes a first supporting portion, and the first supporting portion supports the first conductive plate.
In an embodiment, the electrorheological property testing device further includes a rotating shaft for driving the second conductive plate to rotate.
In one embodiment, the power applying portion is provided with a through hole, the rotating shaft penetrates through the through hole, and the power applying portion is not in contact with the rotating shaft.
In an embodiment, the electrorheological property testing device further includes a driving portion, one end of the rotating shaft is connected with the driving portion, and the other end of the rotating shaft is connected with the second conductive flat plate.
In an embodiment, the electrorheological property testing device further includes a second supporting portion, the second supporting portion is located on one side of the energizing portion departing from the second conductive flat plate, and the driving portion is disposed on the second supporting portion.
In an embodiment, the electrorheological property testing device further includes a third supporting portion, and the third supporting portion supports the energizing portion.
In one embodiment, one end of the third supporting portion is connected to the second supporting portion, and the other end of the third supporting portion is connected to the energizing portion.
In an embodiment, the length of the third support portion is adjustable along a direction from the end of the third support portion connected to the second support portion to the end of the third support portion connected to the power applying portion.
In one embodiment, the distance between the power applying part and the second conductive flat plate is adjustable.
In an embodiment, the electrorheological property testing device further includes a power supply, wherein a positive electrode of the power supply is connected with the power-up portion, and a negative electrode of the power supply is connected with the first conductive flat plate; or the negative pole of the power supply is connected with the power-up part, and the positive pole of the power supply is connected with the first conductive flat plate.
The present application further provides an electrorheological property testing method based on the electrorheological property testing apparatus in any of the above embodiments, including the following steps:
disposing a test sample between the first conductive plate and the second conductive plate;
a dielectric is arranged between the charging part and the second conductive flat plate, wherein the part of the dielectric, which is in contact with the second conductive flat plate, is gas or liquid;
connecting the positive electrode and the negative electrode of a power supply with the power adding part and the first conductive flat plate respectively;
the second conductive plate is rotated.
Drawings
Fig. 1 is a schematic structural diagram of an electrorheological property testing apparatus according to an embodiment;
fig. 2 is a flowchart of an electrorheological property testing method according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It should be noted that when a portion is referred to as being "secured to" another portion, it can be directly on the other portion or there can be an intervening portion. When a portion is said to be "connected" to another portion, it may be directly connected to the other portion or intervening portions may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides an electrorheological property testing apparatus 100. The electrorheological properties testing apparatus 100 includes: a first conductive plate 110, a second conductive plate 120, a power-up portion 130, and a power source 140.
Specifically, in the present embodiment, the current behavior test apparatus 100 further includes a first support part 150. The first support part 150 supports the first conductive plate 110. The first support part 150 may be a base.
The second conductive plate 120 is opposite to the first conductive plate 110. The second conductive plate 120 is rotatable.
Specifically, the electrorheological property testing device 100 further includes a rotation shaft 160 and a driving part (not shown). The driving part may be a motor. One end of the rotation shaft 160 is connected to the driving part, and the other end is connected to the second conductive plate 120. The driving portion drives the rotating shaft 160, and the rotating shaft 160 drives the second conductive plate 120 to rotate.
The charging portion 130 is located on a side of the second conductive plate 120 facing away from the first conductive plate 110. The charging portion 130 does not contact the second conductive plate 120. The gap between the charging portion 130 and the second conductive plate 120 is used to dispose a dielectric (not shown). Wherein the portion of the dielectric in contact with the second conductive plate 120 is a gas or a liquid.
The dielectric may be one or more of a solid, semi-solid, liquid, or gas. The liquid dielectric is, for example, water and the gaseous dielectric is, for example, air.
The power source 140 may be a battery or the like. The negative electrode of the power source 140 may be connected to the first conductive plate 110 and the positive electrode of the power source 140 may be connected to the charging part 130 through a wire. It is understood that the positive electrode of the power source 140 may be connected to the first conductive plate 110, and the negative electrode of the power source 140 may be connected to the power applying portion 130. In other embodiments, the electrorheological property testing device 100 may not be configured with the power source 140. An additional purchased power supply 140 may be used in conducting the electrorheological performance test.
Specifically, after the first conductive plate 110 and the charging portion 130 are respectively connected to the positive and negative electrodes of the power supply, the charging portion 130 and the second conductive plate 120 form a capacitor, and the second conductive plate 120 and the first conductive plate 110 form a capacitor, so that the surface of the second conductive plate 120 facing the charging portion 130 induces and generates an equivalent charge with a sign opposite to that of the charging portion 130, the surface of the second conductive plate 120 facing the first conductive plate 110 induces and generates an equivalent charge with a sign opposite to that of the first conductive plate 110, and an induced electric field is formed between the first conductive plate 110 and the second conductive plate 120, thereby satisfying the requirement of an electric field required to be provided by an electrorheological performance test.
The following describes a specific method for testing the electrorheological properties of a sample using the electrorheological property testing apparatus 100 described above: placing a test sample between the first conductive plate 110 and the second conductive plate 120; disposing a dielectric between the powered portion 130 and the second conductive plate 120; turning on the power source 140 to electrify the electrifying part 130 and the first conductive plate 110; the second conductive plate 120 is rotated.
When the electrorheological property testing device 100 performs an electrorheological property test, the second conductive plate 120 rotates. Since the second conductive plate 120 is opposite to the first conductive plate 110, and the power-up portion 130 is located on a side of the second conductive plate 120 opposite to the first conductive plate 110, when the first conductive plate 110 and the power-up portion 130 are respectively connected to the positive and negative electrodes of the power supply, an induced electric field is formed between the first conductive plate 110 and the second conductive plate 120. Since the energizing part 130 is not in contact with the second conductive plate 120, the electrorheological property testing apparatus 100 forms an electric field between the rotating second conductive plate 120 and the stationary first conductive plate 110 in a non-contact energizing manner, thereby avoiding the problems of easy abrasion of a contact point, unstable power supply and inaccurate test result caused by the conventional contact energizing method. Further, since the portion of the dielectric medium contacting the second conductive plate 120 is gas or liquid, the second conductive plate 120 is not easily worn when rotating, and thus, the power supply stability and the accuracy of the test data are improved.
In an embodiment, the electrorheological property testing device 100 further includes a second supporting portion 170. The driving part is provided on the second support part 170. The second support part 170 may be a top seat. The second supporting portion 170 is located at a side of the power applying portion 130 departing from the second conductive plate 120, so that the driving portion and the rotating shaft 160 are located at a side of the power applying portion 130 departing from the second conductive plate 120, the rotating shaft 160 and the driving portion are conveniently arranged, and the second conductive plate 120 is conveniently driven to rotate.
Specifically, in the present embodiment, the energizing part 130 is a circular ring. The charging portion 130 is provided with a through hole 101. The rotation shaft 160 passes through the through hole 101. Since the driving part and the rotation shaft 160 are located at a side of the charging part 130 facing away from the second conductive plate 120, the rotation shaft 160 is conveniently disposed by passing the rotation shaft 160 through the through hole 101. The diameter of through-hole 101 is greater than the diameter of pivot 160 to when pivot 160 was located through-hole 101, pivot 160 and add electric portion 130 contactless, thereby can guarantee to add no friction between electric portion 130 and the pivot 160, and then can prevent to add electric portion 130 and pivot 160 wearing and tearing, be favorable to improving power supply stability and test result accuracy.
In an embodiment, the electrorheological property testing apparatus 100 further includes a third supporting portion 180, and the third supporting portion 180 supports the energizing portion 130.
Specifically, in this embodiment, the third supporting portion 180 is a fixing bracket, and the power applying portion 130 can be supported by the fixing bracket, which is simple and convenient.
In an embodiment, one end of the third supporting portion 180 is connected to the second supporting portion 170, and the other end is connected to the power applying portion 130, so that the power applying portion 130 is conveniently supported, and the structure is simple and compact.
In one embodiment, the distance between the powered portion 130 and the second conductive plate 120 is adjustable.
Specifically, the powered portion 130 and the second conductive plate 120 form a first capacitor, and the second conductive plate 120 and the first conductive plate 110 form a second capacitor. The sum of the voltages across the two capacitors is equal to the summed voltage (i.e., the voltage between the powered portion 130 and the first conductive plate 110). The voltage division ratio of the two ends of the two capacitors can be calculated by combining a plate capacitor capacitance calculation formula and the like. The voltage division ratio of the two capacitors is related to the ratio of the dielectric constant of the dielectric filled between the two capacitors and the ratio of the inter-plate distance of the two capacitors. Generally, the test distance between the first conductive plate 110 and the second conductive plate 120 and the test sample are specific, so in practical use, the voltage division ratio of the two capacitors can be adjusted by adjusting the distance between the charging portion 130 and the second conductive plate 120 or changing the dielectric filled between the charging portion 130 and the second conductive plate 120, so as to form a required electric field with a specific magnitude between the first conductive plate 110 and the second conductive plate 120.
Specifically, in the present embodiment, the length of the third supporting portion 180 is adjustable along a direction from the end of the third supporting portion 180 connected to the second supporting portion 170 to the end of the third supporting portion 180 connected to the power applying portion 130. For example, the third supporting portion 180 may be designed as a telescopic structure such as a telescopic bracket, a telescopic rod, etc. Since the end of the third supporting portion 180 connected to the second supporting portion 170 is fixed, the position of the charging portion 130 can be adjusted by adjusting the length of the third supporting portion 180, and the distance between the charging portion 130 and the second conductive plate 120 can be adjusted. The voltage division ratio of the two capacitors can be adjusted by adjusting the distance between the charging part 130 and the second conductive plate 120, thereby facilitating fine adjustment of a small voltage between the first conductive plate 110 and the second conductive plate 120.
In other embodiments, the voltage between the first conductive plate 110 and the second conductive plate 120 can be adjusted by other means, such as by selecting dielectrics with different dielectric constants.
Referring to fig. 2, an embodiment of the present application further provides an electrorheological performance testing method based on the electrorheological performance testing apparatus 100 in any of the above embodiments. The method comprises the following steps:
step S110: a test sample is placed between the first conductive plate 110 and the second conductive plate 120.
Step S130: a dielectric is disposed between the powered portion 130 and the second conductive plate 120, wherein a portion of the dielectric in contact with the second conductive plate 120 is a gas or a liquid.
Step S150: the positive and negative electrodes of the power supply 140 are connected to the energizing part 130 and the first conductive plate 110, respectively.
Step S170: the second conductive plate 120 is rotated.
When the current performance test method is used for the current performance test, the second conductive flat plate 120 rotates. Since the second conductive plate 120 is opposite to the first conductive plate 110, and the power-up portion 130 is located on a side of the second conductive plate 120 opposite to the first conductive plate 110, when the first conductive plate 110 and the power-up portion 130 are respectively connected to the positive and negative electrodes of the power supply, an induced electric field is formed between the first conductive plate 110 and the second conductive plate 120. Since the energizing part 130 is not in contact with the second conductive plate 120, the electrorheological property testing apparatus 100 forms an electric field between the rotating second conductive plate 120 and the stationary first conductive plate 110 in a non-contact energizing manner, thereby avoiding the problems of easy abrasion of a contact point, unstable power supply and inaccurate test result caused by the conventional contact energizing method. The method is simple and easy to implement, low in cost, simple and convenient in structure, convenient for large-scale popularization and high in practical value. Meanwhile, the method does not need to use liquid mercury and other conductive liquids, does not need to consider the problems of sealing, pollution and the like, and is green and environment-friendly. Further, since the portion of the dielectric medium contacting the second conductive plate 120 is gas or liquid, the second conductive plate 120 is not easily worn when rotating, and thus, the power supply stability and the accuracy of the test data are improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electrorheological property testing device, comprising:
a first conductive plate;
a second conductive plate opposite the first conductive plate, the second conductive plate being rotatable;
the charging part is positioned on one side of the second conductive flat plate, which is opposite to the first conductive flat plate, a gap is arranged between the charging part and the second conductive flat plate, and a dielectric medium is arranged in the gap, wherein the part of the dielectric medium, which is in contact with the second conductive flat plate, is gas or liquid; wherein one of the charging portion and the first conductive plate is used for being connected with a positive electrode of a power supply, and the other one of the charging portion and the first conductive plate is used for being connected with a negative electrode of the power supply, so that the charging portion and the second conductive plate form a first capacitor, and the second conductive plate and the first conductive plate form a second capacitor; and
the rotating shaft is connected with the second conductive flat plate and is used for driving the second conductive flat plate to rotate; the power-on part is provided with a through hole, the diameter of the through hole is larger than that of the rotating shaft, and the rotating shaft penetrates through the through hole and is not in contact with the power-on part.
2. The electrorheological performance testing device of claim 1, further comprising a first support portion that supports the first conductive plate.
3. The electrorheological property testing device of claim 1, further comprising a driving portion, wherein one end of the rotating shaft is connected with the driving portion.
4. The electrorheological property testing device of claim 3, further comprising a second supporting portion, the second supporting portion is located on a side of the energizing portion away from the second conductive flat plate, and the driving portion is disposed on the second supporting portion.
5. The electrorheological performance testing device of claim 4, further comprising a third support portion that supports the energizing portion.
6. The electrorheological performance testing device of claim 5, wherein one end of the third support portion is connected to the second support portion, and the other end is connected to the energizing portion.
7. The electrorheological performance testing device of claim 6, wherein the length of the third support portion is adjustable along a direction from the end of the third support portion connected to the second support portion to the end of the third support portion connected to the energizing portion.
8. The electrorheological property testing device of claim 1, wherein a distance between the energizing portion and the second conductive plate is adjustable.
9. The electrorheological performance testing device of claim 1, further comprising a power supply, wherein a positive electrode of the power supply is connected with the power-up part, and a negative electrode of the power supply is connected with the first conductive flat plate; or the negative pole of the power supply is connected with the power-up part, and the positive pole of the power supply is connected with the first conductive flat plate.
10. An electrorheological property testing method based on the electrorheological property testing device of any one of claims 1 to 9, characterized by comprising the following steps:
disposing a test sample between the first conductive plate and the second conductive plate;
a dielectric is arranged between the charging part and the second conductive flat plate, wherein the part of the dielectric, which is in contact with the second conductive flat plate, is gas or liquid;
connecting the positive electrode and the negative electrode of a power supply with the power adding part and the first conductive flat plate respectively;
rotating the second conductive plate.
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| CN202010124032.8A CN111257168B (en) | 2020-02-27 | 2020-02-27 | Electrorheological property testing device and method |
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| CN202010124032.8A CN111257168B (en) | 2020-02-27 | 2020-02-27 | Electrorheological property testing device and method |
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| CN2289292Y (en) * | 1996-11-22 | 1998-08-26 | 赵洪申 | Speed relay |
| JP4549822B2 (en) * | 2004-11-17 | 2010-09-22 | 株式会社ディスコ | Ultrasonic vibration cutting equipment |
| CN100381808C (en) * | 2005-08-18 | 2008-04-16 | 上海交通大学 | Measurement system for rheological property of electrorheological fluids (ERF) |
| CN101791728A (en) * | 2010-01-28 | 2010-08-04 | 哈尔滨工业大学 | Voltage detection method between non-contact poles for electrostatic induction micro electro discharge machining and circuit design thereof |
| CN101898298A (en) * | 2010-07-14 | 2010-12-01 | 天津大学 | Accessory non-contact power supply type rotary ultrasonic machining device |
| KR101251552B1 (en) * | 2011-10-13 | 2013-04-08 | 한국철도기술연구원 | Noncontact power-feeding device using conductivefluid |
| WO2015108152A1 (en) * | 2014-01-20 | 2015-07-23 | 日立オートモティブシステムズ株式会社 | Rotating body noncontact power feeding device and torque sensor |
| CN106464309B (en) * | 2014-06-25 | 2018-10-30 | 宇部兴产株式会社 | dielectric non-contact transmission device and non-contact transmission method |
| CN205231994U (en) * | 2015-12-23 | 2016-05-11 | 江西科技学院 | Rotary part's non -contact power supply unit |
| CN105865977B (en) * | 2016-03-31 | 2018-08-24 | 南京师范大学 | Device and method that are a kind of while measuring rheology parameter and electricity parameter |
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