CN111420858A - Vibration exciting device - Google Patents
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- CN111420858A CN111420858A CN202010336232.XA CN202010336232A CN111420858A CN 111420858 A CN111420858 A CN 111420858A CN 202010336232 A CN202010336232 A CN 202010336232A CN 111420858 A CN111420858 A CN 111420858A
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- 230000001133 acceleration Effects 0.000 claims abstract description 48
- 230000005684 electric field Effects 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims abstract description 26
- 230000015271 coagulation Effects 0.000 claims abstract description 23
- 238000005345 coagulation Methods 0.000 claims abstract description 23
- 230000023555 blood coagulation Effects 0.000 claims abstract description 18
- 230000033001 locomotion Effects 0.000 claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims description 57
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000009087 cell motility Effects 0.000 claims 1
- 230000005685 electric field effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 10
- 239000008280 blood Substances 0.000 description 8
- 210000004369 blood Anatomy 0.000 description 8
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- 208000007536 Thrombosis Diseases 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 3
- 230000020764 fibrinolysis Effects 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000023597 hemostasis Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004393 prognosis Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000003146 anticoagulant agent Substances 0.000 description 1
- 229940127219 anticoagulant drug Drugs 0.000 description 1
- 230000010100 anticoagulation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006247 magnetic powder Chemical group 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/12—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving reciprocating masses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/49—Blood
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- Urology & Nephrology (AREA)
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Abstract
The invention provides a vibration excitation device, and belongs to the technical field of medical instruments. The vibration exciting apparatus includes: the vibration source is electrically connected with the controller and comprises a stator and a rotor, the rotor reciprocates relative to the stator under the action of an alternating magnetic field or an external electric field, the rotor is externally connected with a coagulation analyzer to drive the coagulation analyzer to move, the controller controls the amplitude and the acceleration of the reciprocating motion of the rotor relative to the stator by adjusting the applied alternating magnetic field and frequency or the strength and the frequency of the external electric field, and the sensor is arranged on the rotor and used for collecting the amplitude and the acceleration of the motion of the rotor. The application can control the amplitude and the acceleration of the blood coagulation analyzer in the vibration process to be kept constant.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a vibration excitation device.
Background
The blood coagulation analyzer is an apparatus which is clinically used for analyzing the functions of blood coagulation and anticoagulation, fibrinolysis and anti-fibrinolysis of blood of patients. Among them, the coagulation method can be used for measuring coagulation properties or fibrinolysis properties of blood samples. Coagulation method (also called biological method) the coagulation method is a method in which a series of changes in physical quantities (optical, electrical, mechanical movement, etc.) of plasma by a coagulation activator are detected, and the data obtained are analyzed by a computer and converted into a final result.
The coagulation property of a blood sample is detected by adopting a coagulation method, a vibration source is provided for a coagulation analyzer to generate vibration in the coagulation detection process, and the coagulation property of the blood sample is judged by detecting the physical quantity change of the blood sample. However, in the process of detecting the coagulation property of a blood sample by the coagulation method, it is difficult to control the amplitude and acceleration of the coagulation analyzer to be constant, and therefore, the accuracy of the detection result is not high.
Disclosure of Invention
The invention aims to provide a vibration exciting device which can control the amplitude and the acceleration of a blood coagulation analyzer to be kept constant in the vibration process.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, there is provided a vibration excitation device including: the vibration source is electrically connected with the controller and comprises a stator and a rotor, the rotor reciprocates relative to the stator under the action of an alternating magnetic field or an external electric field, the rotor is externally connected with a coagulation analyzer to drive the coagulation analyzer to move, the controller controls the amplitude and the acceleration of the reciprocating motion of the rotor relative to the stator by adjusting the applied alternating magnetic field and frequency or the strength and the frequency of the external electric field, and the sensor is arranged on the rotor and used for collecting the amplitude and the acceleration of the motion of the rotor.
Alternatively, the stator and the mover are a coil and a permanent magnet inserted in the coil, respectively, and an alternating current is applied to the coil to reciprocate between the coil and the permanent magnet.
Optionally, the permanent magnet is of a U-shaped structure, the coil includes two first coils arranged in parallel, and two side walls of the U-shaped structure are respectively inserted into the two first coils.
Optionally, the permanent magnet includes two first magnets arranged in parallel, the two first magnets are respectively inserted into the coil, the first magnets are U-shaped structures, and adjacent side walls of the two U-shaped structures are respectively located in the coil.
Optionally, the vibration excitation device further includes a connecting plate, one side of the connecting plate is fixedly connected with the mover, and the other side of the connecting plate is used for fixedly arranging the sensor and the blood coagulation analyzer.
Optionally, the vibration excitation device further includes a plurality of elastic members distributed around the periphery of the vibration source, and one ends of the plurality of elastic members are connected to the connecting plate, and the other ends of the plurality of elastic members are connected to the stator, so as to provide positioning buffering for the reciprocating motion between the stator and the mover.
Optionally, the stator and the mover are respectively a piezoelectric ceramic and a housing sleeved on the piezoelectric ceramic, and an alternating voltage and a frequency are applied to the piezoelectric ceramic to deform the piezoelectric ceramic to reciprocate relative to the housing.
Optionally, the piezoelectric ceramic includes a plurality of piezoelectric ceramic pieces, and the plurality of piezoelectric ceramic pieces are sequentially stacked in a vibration direction of the mover.
Optionally, the vibration excitation device further comprises a pre-tightening system, the pre-tightening system comprises a pre-tightening block and a pre-tightening piece, the pre-tightening block is fixedly connected with the base of the shell, the pre-tightening piece deviates from the base and is arranged on the inner wall of the shell, and the pre-tightening piece is used for preventing the piezoelectric ceramic pieces from being scattered when the piezoelectric ceramic pieces are connected with current.
Optionally, the vibration excitation device further comprises a connecting rod, one end of the connecting rod is connected with the piezoelectric ceramic, and the other end of the connecting rod is used for fixedly arranging the sensor and the blood coagulation analyzer.
Optionally, the sensor is a displacement sensor and/or an acceleration sensor.
The embodiment of the invention has the beneficial effects that:
according to the vibration excitation device provided by the embodiment of the invention, the amplitude and the acceleration of the vibration source are kept constant by adjusting the intensity and the frequency of an external electric field or the intensity and the frequency of an alternating magnetic field through the controller. Specifically, the vibration excitation device comprises a vibration source, a sensor and a controller, wherein the vibration source is electrically connected with the controller, the vibration source comprises a stator and a rotor, and the vibration is realized in a mode that the rotor reciprocates relative to the stator under the action of an alternating magnetic field or an external electric field. And the sensor is arranged on the rotor and is used for acquiring the amplitude and the acceleration of the motion of the rotor. The controller controls the amplitude and the acceleration of the reciprocating motion of the mover relative to the stator by adjusting the strength and the frequency of the applied alternating magnetic field or the strength and the frequency of the external electric field, so that the amplitude and the acceleration of the coagulation analyzer are kept constant.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a vibration source in a vibration excitation device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control system in a vibration excitation device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a vibration exciting apparatus according to an embodiment of the present invention;
fig. 4 is a second schematic structural diagram of a vibration excitation device according to an embodiment of the present invention.
Icon: 10-a vibration source; 11-a stator; 12-a mover; 13-a connecting plate; 14-an elastic member; 15-a base plate; 20-a controller; 30-sensor, 40-piezoelectric ceramic; 41-a housing; 42-a pre-tensioning block; 43-preload members; 44-connecting rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and in a manner that will enable those skilled in the art to understand in detail the meaning of the terms in the present invention.
Fig. 1 is a schematic structural diagram of a vibration source 10 in a vibration excitation device according to an embodiment of the present invention, and referring to fig. 1, the embodiment of the present invention provides a vibration excitation device, including: the vibration source 10 is electrically connected with the controller 20, the vibration source 10 comprises a stator 11 and a mover 12, the mover 12 reciprocates relative to the stator 11 under the action of an alternating magnetic field or an external electric field, the mover 12 is externally connected with a coagulation analyzer to drive the coagulation analyzer to move, the controller 20 controls the amplitude and the acceleration of the reciprocating motion of the mover 12 relative to the stator 11 by adjusting the applied alternating magnetic field and frequency or the intensity and the frequency of the external electric field, and the sensor 30 is arranged on the mover 12 and used for collecting the amplitude and the acceleration of the motion of the mover 12.
Wherein the controller 20 receives a vibration signal of the vibration source 10 acquired by the sensor 30, the vibration signal including amplitude information and acceleration information. And comparing the obtained vibration signal information of the vibration source 10 with a preset threshold value, and further controlling the magnitude of the current supplied to the vibration source 10 according to the comparison result.
Illustratively, the displacement sensor 30 acquires an amplitude of the mover 12 of 18 μm (or the acceleration sensor acquires an acceleration of the mover of 30 m/s)2) The preset threshold value for displacement in the controller 20 is 20 μm (or the preset threshold value for acceleration is 35 m/s)2) When the controller 20 receives the data transmitted by the displacement sensor (or the acceleration sensor), the obtained data is compared with the preset threshold, and as a result of the comparison, the amplitude of the mover 12 is smaller than the preset threshold (or the value of the acceleration of the mover 12 is smaller than the preset threshold), the controller 20 controls the inputThe current to the vibration source 10 is increased, and since the amplitude of the mover 12 is smaller than the preset threshold, that is, it indicates that the external electric field strength or the alternating magnetic field strength is weak, the external electric field strength or the alternating magnetic field strength needs to be increased, so that the vibration amplitude (or the vibration acceleration) of the vibration source 10 can be equal to the preset threshold, and the amplitude (or the acceleration) of the vibration source 10 is controlled to be constant by controlling the magnitude of the current entering the vibration source 10.
It should be noted that the second derivative of the displacement can obtain the corresponding acceleration. Conversely, a quadratic integral of the acceleration may result in a corresponding displacement.
Fig. 2 is a schematic structural diagram of a control system in a vibration excitation device according to an embodiment of the present invention, in which a sensor 30 is connected to a mover in a vibration source 10 and is also electrically connected to a controller 20, and the controller 20 is electrically connected to the vibration source 10. The sensor 30 collects the amplitude and acceleration data of the vibration source 10 and sends the amplitude and acceleration data to the controller 20, the controller 20 acquires the data sent by the sensor 30 and compares the data with a preset threshold, and when the data acquired by the sensor 30 is higher or lower than the preset threshold, the controller 20 controls the intensity of the external electric field or the intensity of the alternating magnetic field by controlling the magnitude of the current input to the vibration source 10, thereby controlling the amplitude and acceleration of the vibration source 10 to be constant.
First, in the present embodiment, the vibration source 10 is a vibration generated by an electric field or an ac magnetic field, and the amplitude and the acceleration of the vibration source 10 are controlled to be constant by controlling the intensity and the frequency of the external electric field or the intensity and the frequency of the ac magnetic field.
Secondly, in the present embodiment, during the vibration of the vibration source 10, the amplitude and acceleration information of the vibration source 10 are acquired by the sensor 30. Specifically, the amplitude is used to reflect the magnitude of the vibration amplitude of the vibration source 10, and the acceleration is used to reflect the magnitude of the vibration intensity of the vibration source 10. Because the application is used for providing vibration for the blood analyzer, items of coagulation analysis and examination are widely applied to diagnosis, curative effect observation, anticoagulant drug dosage and prognosis analysis of bleeding, thrombotic diseases and prothrombotic states, and diagnosis and curative effect observation of various primary or secondary fibrinolysis. The automatic blood coagulation analysis refers to analyzing related components in a hemostasis and thrombosis system by an automatic blood coagulation analyzer or other analyzers and applying the analysis to diagnosis, treatment and prognosis judgment of bleeding and thrombotic diseases; the application of the automatic blood coagulation analyzer enables the hemostasis and thrombosis project examination to be simple, convenient and accurate, and a plurality of accurate quantitative results can be made. Therefore, it is necessary to keep the vibration amplitude and the vibration force of the vibration source 10 constant.
Illustratively, the vibration source 10 generates vibration under the action of an alternating magnetic field, if the stator 11 is a coil, the mover 12 is a magnet, an alternating current is supplied to the coil to enable the coil to cooperate with the magnet to generate the alternating magnetic field, under the action of the alternating magnetic field, the magnet reciprocates relative to the coil, if the amplitude required by the blood analyzer is 20 μm, and when the amplitude of the magnet obtained by the sensor 30 is higher than 20 μm, the controller 20 controls the amplitude of the magnet to be 20 μm through the current amount of the alternating current; similarly, if the amplitude of the magnet acquired by the sensor 30 is less than 20 μm, the controller 20 controls the amplitude of the magnet to be kept at 20 μm by controlling the alternating current to increase the current amount, and the controller 20 controls the magnetic field intensity and the frequency according to the comparison result by comparing the amplitude or the acceleration acquired by the sensor 30 with a preset threshold value, thereby controlling the amplitude and the acceleration of the vibration source 10 to be kept constant.
According to the vibration excitation device provided by the embodiment of the invention, the amplitude and the acceleration of the vibration source are kept constant by adjusting the intensity and the frequency of an external electric field or the intensity and the frequency of an alternating magnetic field through the controller. Specifically, the vibration exciting device comprises a vibration source 10, a sensor 30 and a controller 20, wherein the vibration source 10 is electrically connected with the controller 20, the vibration source 10 comprises a stator 11 and a mover 12, and the vibration is realized by the fact that the mover 12 reciprocates relative to the stator 11 under the action of an alternating magnetic field or an external electric field. In structural connection, the mover 12 is externally connected to a blood coagulation analyzer to drive the blood coagulation analyzer to move, and the sensor 30 is disposed on the mover 12 to collect the amplitude and the acceleration of the movement of the mover 12. The controller 20 controls the amplitude and acceleration of the reciprocating motion of the mover 12 relative to the stator 11 by adjusting the intensity and frequency of the applied alternating magnetic field or the intensity and frequency of the external electric field, thereby achieving the adjustment of the amplitude and acceleration of the coagulation analyzer to be kept constant.
In the present embodiment, a scheme is provided for controlling the amplitude and the acceleration of the vibration source 10 to be kept constant by controlling the intensity and the frequency of the alternating magnetic field, and optionally, the stator 11 and the mover 12 are respectively a coil and a permanent magnet inserted into the coil, and an alternating current is applied to the coil to reciprocate the coil and the permanent magnet.
The above-mentioned scheme has two embodiments, one is that the stator 11 is a coil, and the mover 12 is a permanent magnet. Second, the stator 11 is a permanent magnet, and the mover 12 is a coil.
First, a permanent magnet (permanent magnet) may be a natural product, also called a natural magnet, or may be manufactured by a person. The material has wide magnetic hysteresis loop, high coercive force and high remanence, and can keep constant magnetism once magnetized.
Second, a coil is generally referred to as a loop to wire winding. The coil in the circuit is an inductor, the wires are wound one by one and are mutually insulated, and the insulating tube can be hollow and can also comprise an iron core or a magnetic powder core, which is called an inductor for short. The inductor can be divided into a fixed inductor and a variable inductor, and the fixed inductor coil is called an inductor or a coil for short.
Thirdly, when alternating current is passed through the coil, a varying alternating magnetic field is generated, which interacts with the permanent magnet to generate vibration.
Given that the vibration source 10 generates vibration under the action of the alternating magnetic field, in this embodiment, optionally, the permanent magnet is in a U-shaped structure, the coil includes two first coils arranged in parallel, and two side walls of the U-shaped structure are respectively inserted into the two first coils.
It should be noted that the permanent magnet with the U-shaped structure can be inserted into the two coils at the same time, so as to increase the intensity of the alternating magnetic field. Because the alternating magnetic field strength is related to the magnitude of the current, the coil characteristics, and the magnetic core, the coil characteristics include: number of coil turns and coil shape, e.g. planar coil, solenoid, etc. The magnetic core, not only being a magnetic material, also includes a material arbitrarily placed inside or near the coil, such as air, ceramic, and the like.
When there are two first coils, it is necessary to provide a bottom plate 15 for connecting the two first coils.
In the embodiment, optionally, two permanent magnets of a U-shaped structure and at least one coil are provided, the permanent magnet includes two first magnets arranged in parallel, the two first magnets are respectively inserted into the coils, the first magnets are of a U-shaped structure, and adjacent side walls of the two U-shaped structures are respectively located in the coils.
The adjacent side walls of the two U-shaped structures are inserted into the coil, so that the alternating magnetic field intensity can be increased under the condition of the same current magnitude.
Fig. 3 is a schematic structural diagram of the vibration excitation device according to the embodiment of the present invention, and optionally, referring to fig. 3, the vibration excitation device further includes a connecting plate 13, one side of the connecting plate 13 is fixedly connected to the mover 12, and the other side is used for fixedly arranging the sensor 30 and the blood coagulation analyzer.
It should be noted that, in order to improve the stability of the connection between the sensor 30 and the blood coagulation analyzer and the mover 12, it is necessary to provide a connection plate 13 and provide a connection space for other connection components, which is not described in detail herein.
Referring to fig. 3, in order to prevent the coil and the permanent magnet from being separated, in this embodiment, optionally, the vibration exciting device further includes a plurality of elastic members 14 distributed on the periphery of the vibration source 10, and one end of each of the plurality of elastic members 14 is connected to the connecting plate 13, and the other end is connected to the stator 11, so as to provide a positioning buffer for the reciprocating motion between the stator 11 and the mover 12.
It should be noted that, when the controller 20 fails, the alternating current input to the coil is not controlled, and when the alternating current is too large, the alternating magnetic field intensity generated by the coil and the permanent magnet is large, and under the action of the large magnetic field intensity, the amplitude generated by the vibration source 10 is large, so that the permanent magnet may be separated from the coil, or the coil may be separated from the permanent magnet. When the elastic member 14 is provided, the maximum amount of expansion and contraction of the elastic member 14 can prevent the permanent magnet and the coil from being surely separated.
Fig. 4 is a second schematic structural diagram of a vibration exciting apparatus according to an embodiment of the present invention, and optionally, referring to fig. 4, the alternating-current electric field strength is controlled to realize the reciprocating motion of the mover 12 relative to the stator 11. Specifically, the stator 11 and the mover 12 are a piezoelectric ceramic 40 and a case 41 fitted over the piezoelectric ceramic 40, respectively, and an alternating voltage and a frequency are applied to the piezoelectric ceramic 40 to deform the piezoelectric ceramic 40 to reciprocate with respect to the case 41.
The piezoelectric ceramic 40 is an information functional ceramic material capable of converting mechanical energy and electrical energy into each other, i.e., a piezoelectric effect, and the piezoelectric ceramic 40 has dielectric properties, elasticity, and the like in addition to piezoelectricity. The dielectric properties of the piezoelectric ceramic 40 reflect the response of the ceramic material to external electric fields, for example, audio devices such as piezoelectric ceramic speakers require a high dielectric constant of the ceramic, while high frequency piezoelectric ceramic components require a low dielectric constant of the material. The elastic coefficient of piezoelectric ceramics is a parameter reflecting the relationship between the deformation and the acting force of ceramics. Piezoceramic materials, like other elastomers, follow hooke's law.
Wherein, bound charges appear at two ends of the polarized piezoelectric ceramic plate, so a layer of free charges from the outside is adsorbed on the surface of the electrode. When an external pressure is applied to the ceramic plate, the two ends of the ceramic plate can generate a discharge phenomenon. Charging occurs on the contrary when a pulling force is applied. The phenomenon of converting the mechanical effect into the electrical effect belongs to the positive piezoelectric effect.
In addition, the piezoelectric ceramic 40 has a property of spontaneous polarization, which can be transformed by an external electric field. Therefore, when an external electric field is applied to the piezoelectric dielectric, the piezoelectric ceramic 40 is deformed. All the piezoelectric ceramics 40 are deformed because the application of the external electric field equivalent to the spontaneous polarization results in an increase in the polarization strength. The increase in the polarization causes the piezoelectric ceramic sheet to elongate in the polarization direction. Conversely, if a reverse electric field is applied, the ceramic sheet shortens in the direction of polarization. This phenomenon, which is converted into a mechanical effect due to an electrical effect, is an inverse piezoelectric effect. The inverse piezoelectric effect is used in this embodiment.
Further, the piezoelectric ceramics 40 includes a plurality of piezoelectric ceramic pieces, which are sequentially stacked along the vibration direction of the mover 12.
It should be noted that, when a voltage is applied to the piezoelectric ceramic, commonly referred to as a buzzer, will be mechanically deformed along with the change of the voltage and the frequency. On the other hand, when the piezoelectric ceramic plate is vibrated, an electric charge is generated. By using this principle, a vibrator can be constructed by two piezoelectric ceramic sheets or a piezoelectric ceramic sheet and a metal sheet.
Furthermore, as can be seen from the above, the piezoelectric ceramic 40 is a plurality of piezoelectric ceramic pieces, and when the plurality of piezoelectric ceramic pieces deform under the action of the external electric field, the plurality of piezoelectric ceramic pieces are easily dispersed, in order to prevent the above situation, the vibration excitation device in this embodiment further includes a pre-tightening system, the pre-tightening system includes a pre-tightening block 42 and a pre-tightening piece 43, the pre-tightening block 42 is fixedly connected to the base of the housing 41, the pre-tightening piece 43 is disposed on the inner wall of the housing 41 away from the base, and the pre-tightening piece 43 is used to prevent the plurality of piezoelectric ceramic pieces from dispersing when the current is conducted.
Illustratively, in this embodiment, the number of the piezoelectric ceramic sheets is 10, one side of the piezoelectric ceramic sheet close to the base of the housing 41 is fixed by the pre-tightening block 42, the pre-tightening block 42 is fixedly connected with the housing 41, one side of the housing 41 away from the pre-tightening block 42 is provided with the pre-tightening piece 43, one end of the pre-tightening piece 43 is fixedly connected with the inner wall of the housing 41, the other end of the pre-tightening piece is arranged at one end of the piezoelectric ceramic sheets away from the pre-tightening block 42, the pre-tightening piece 43 may be an elastic wire or an elastic rod, and redundant description is.
Optionally, in order to improve the stability of the installation of the sensor and the blood coagulation analyzer, the vibration exciting device further comprises a connecting rod 44, one end of the connecting rod 44 is connected with the piezoelectric ceramic 40, and the other end is used for fixedly arranging the sensor 30 and the blood coagulation analyzer.
Optionally, the sensor 30 in this embodiment is a displacement sensor and/or an acceleration sensor.
In the case where the sensor 30 is a displacement sensor, the corresponding acceleration can be obtained by performing second differentiation on the obtained displacement. If the sensor 30 is an acceleration sensor, the corresponding displacement can be obtained by performing a second integration on the obtained acceleration data. If the sensor 30 is a displacement sensor or an acceleration sensor, the corresponding displacement and acceleration can be obtained by directly obtaining the data collected by the displacement sensor or the acceleration sensor.
According to the vibration excitation device provided by the embodiment of the invention, the controller 20 is used for adjusting the intensity of the alternating electric field or the intensity of the alternating magnetic field, so that the amplitude and the acceleration of the vibration source 10 are kept constant.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A vibration exciting apparatus comprising: vibration source, sensor and controller, the vibration source with the controller electricity is connected, the vibration source includes stator and active cell, the active cell is relative to stator reciprocating motion under alternating magnetic field or external electric field effect, the active cell is used for external blood coagulation analysis appearance in order to drive the motion of blood coagulation analysis appearance, the controller is through adjusting alternating magnetic field and the frequency of applyieing or external electric field intensity and frequency control the active cell for stator reciprocating motion's amplitude and acceleration, the sensor sets up on the active cell, be used for gathering the amplitude and the acceleration of active cell motion.
2. The vibration exciting apparatus according to claim 1, wherein said stator and said mover are respectively a coil and a permanent magnet inserted in said coil, and an alternating current is applied to said coil to reciprocate between said coil and said permanent magnet.
3. The vibration excitation device according to claim 2, wherein the permanent magnet has a U-shaped configuration, the coil includes two first coils arranged in parallel, and two side walls of the U-shaped configuration are respectively inserted into the two first coils.
4. The vibration excitation device according to claim 2, further comprising a connection plate, wherein one side of the connection plate is fixedly connected to the mover, and the other side of the connection plate is used for fixedly arranging the sensor and the blood coagulation analyzer.
5. The vibration excitation device according to claim 4, further comprising a plurality of elastic members distributed around the periphery of the vibration source, one end of the plurality of elastic members being connected to the connection plate and the other end thereof being connected to the stator, so as to provide positioning cushioning of the reciprocating motion between the stator and the mover.
6. A vibration exciting device according to claim 1, wherein said stator and said mover are respectively a piezoelectric ceramic and a housing fitted over said piezoelectric ceramic, and an alternating voltage and frequency are applied to said piezoelectric ceramic to deform said piezoelectric ceramic to reciprocate relative to said housing.
7. The vibration excitation device according to claim 6, wherein said piezoelectric ceramic includes a plurality of piezoelectric ceramic pieces, and a plurality of said piezoelectric ceramic pieces are sequentially stacked in a vibration direction of said mover.
8. The vibration excitation device according to claim 7, further comprising a pre-tightening system, wherein the pre-tightening system comprises a pre-tightening block and a pre-tightening member, the pre-tightening block is fixedly connected with the base of the housing, the pre-tightening member is arranged on the inner wall of the housing away from the base, and the pre-tightening member is used for preventing the plurality of piezoelectric ceramic plates from being scattered when the plurality of piezoelectric ceramic plates are connected with current.
9. The vibration excitation device according to claim 6, further comprising a connection rod having one end connected to the piezoelectric ceramic and the other end for fixedly disposing the sensor and the coagulation analyzer.
10. Vibration exciting device according to claim 1, wherein said sensor is a displacement sensor and/or an acceleration sensor.
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| CN202010336232.XA CN111420858B (en) | 2020-04-24 | Vibration excitation device |
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| CN202010336232.XA CN111420858B (en) | 2020-04-24 | Vibration excitation device |
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