CN111420858A - A vibration excitation device - Google Patents

Abstract

The invention provides a vibration excitation device, which belongs to the technical field of medical equipment. The vibration excitation device includes: a vibration source, a sensor and a controller, the vibration source is electrically connected to the controller, the vibration source includes a stator and a mover, the mover reciprocates relative to the stator under the action of an alternating magnetic field or an external electric field, and the mover uses It is connected to an external coagulation analyzer to drive the coagulation analyzer to move. The controller controls the amplitude and acceleration of the reciprocating motion of the mover relative to the stator by adjusting the applied alternating magnetic field and frequency or the strength and frequency of the external electric field. to collect the amplitude and acceleration of the mover motion. The present application can control the amplitude and acceleration of the coagulation analyzer to keep constant during the vibration process.

Description

A vibration excitation device

technical field

The present invention relates to the technical field of medical devices, in particular, to a vibration excitation device.

Background technique

The coagulation analyzer is an instrument used clinically to analyze the coagulation and anticoagulation, fibrinolysis and antifibrinolytic functions of the blood of patients. Among them, the coagulation method can be used to measure the coagulation properties or fibrinolytic properties of blood samples. Coagulation method (also known as biological method) coagulation method is to detect the changes of a series of physical quantities (light, electricity, mechanical motion, etc.) of plasma under the action of coagulation activator, and then analyze the obtained data by computer and convert it into final As a result, it can also be called a biophysical method.

Using the coagulation method to detect the coagulation characteristics of blood samples, it is necessary to provide a vibration source to the coagulation analyzer to make it vibrate during the coagulation detection process, and determine its coagulation performance by detecting changes in the physical quantities of the blood samples. However, in the current process of detecting the coagulation characteristics of blood samples by the coagulation method, since it is difficult to control the amplitude and acceleration of the coagulation analyzer to keep constant, the accuracy of the detection results is not high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a vibration excitation device, which can control the amplitude and acceleration of the coagulation analyzer to keep constant during the vibration process.

Embodiments of the present invention are implemented as follows:

An aspect of the embodiments of the present invention provides a vibration excitation device, including: a vibration source, a sensor, and a controller, the vibration source is electrically connected to the controller, the vibration source includes a stator and a mover, and the mover operates in an alternating magnetic field or an external electric field Under the action, the mover reciprocates relative to the stator, and the mover is used to connect the coagulation analyzer to drive the movement of the coagulation analyzer. The controller controls the reciprocating motion of the mover relative to the stator by adjusting the applied alternating magnetic field and frequency or the strength and frequency of the external electric field. Amplitude and acceleration, the sensor is set on the mover to collect the amplitude and acceleration of the mover movement.

Optionally, the stator and the mover are respectively a coil and a permanent magnet inserted in the coil, and an alternating current is applied to the coil to make the coil and the permanent magnet reciprocate.

Optionally, the permanent magnet has 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 in the coil, the first magnet is in a U-shaped structure, and the 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 is used for fixing the sensor and the coagulation analyzer.

Optionally, the vibration excitation device also includes a plurality of elastic members distributed on the periphery of the vibration source, one end of the plurality of elastic members is connected with the connecting plate, and the other end is connected with the stator, so as to provide a positioning buffer for the reciprocating motion between the stator and the mover. .

Optionally, the stator and the mover are respectively piezoelectric ceramics and a casing sleeved on the piezoelectric ceramics, and alternating voltage and frequency are applied to the piezoelectric ceramics to deform the piezoelectric ceramics to reciprocate relative to the casing.

Optionally, the piezoelectric ceramic includes a plurality of piezoelectric ceramic sheets, and the plurality of piezoelectric ceramic sheets are stacked in sequence along the vibration direction of the mover.

Optionally, the vibration excitation device further includes a preloading system, the preloading system includes a preloading block and a preloading piece, the preloading block is fixedly connected with the base of the housing, the preloading piece is arranged on the inner wall of the housing away from the base, and the preloading piece is used for In order to prevent multiple piezoelectric ceramic sheets from spreading out when the current is connected.

Optionally, the vibration excitation device further includes a connecting rod, one end of the connecting rod is connected with the piezoelectric ceramic, and the other end is used for fixing the sensor and the coagulation analyzer.

Optionally, the sensor is a displacement sensor and/or an acceleration sensor.

The beneficial effects of the embodiments of the present invention include:

In the vibration excitation device provided by the embodiment of the present invention, the intensity and frequency of the external electric field or the intensity and frequency of the alternating magnetic field are adjusted by the controller, thereby keeping the amplitude and acceleration of the vibration source constant. Specifically, the vibration excitation device is composed of a vibration source, a sensor and a controller, wherein the vibration source is electrically connected to the controller, the vibration source is composed of a stator and a mover, and the vibration is realized by the mover acting on an alternating magnetic field or an external electric field The lower part reciprocates relative to the stator. On the structural connection, the mover is used to connect an external coagulation analyzer to drive the movement of the coagulation analyzer, and the sensor is arranged on the mover to collect the amplitude and acceleration of the mover's movement. The controller controls the amplitude and acceleration of the reciprocating motion of the mover relative to the stator by adjusting the applied alternating magnetic field and frequency or the strength and frequency of the external electric field, so that the amplitude and acceleration of the coagulation analyzer can be adjusted to keep constant.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a vibration source in a vibration excitation device provided by an embodiment of the present invention;

2 is a schematic structural diagram of a control system in a vibration excitation device provided by an embodiment of the present invention;

3 is one of the schematic structural diagrams of the vibration excitation device provided by the embodiment of the present invention;

FIG. 4 is a second schematic structural diagram of a vibration excitation device provided by an embodiment of the present invention.

Icon: 10-vibration source; 11-stator; 12-mover; 13-connecting plate; 14-elastic part; 15-base plate; 20-controller; 30-sensor, 40-piezoelectric ceramics; 41-housing; 42 - preload block; 43 - preload; 44 - connecting rod.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense for those of ordinary skill in the art. In other words, the specific meanings of the above terms in the present invention can be understood in specific situations.

1 is a schematic structural diagram of a vibration source 10 in a vibration excitation device provided by an embodiment of the present invention. Please refer to FIG. 1. An embodiment of the present invention provides a vibration excitation device, including: a vibration source 10, a sensor 30, and a controller 20. The vibration source 10 is electrically connected to the controller 20, the vibration source 10 includes 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, and the mover 12 is used to connect an external coagulation analyzer to drive coagulation The analyzer moves, the controller 20 controls the amplitude and 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 strength and frequency of the external electric field. Amplitude and acceleration of sub 12 movement.

The controller 20 receives the vibration signal obtained from the vibration source 10 through the sensor 30, and the vibration signal includes amplitude information and acceleration information. Then, the obtained vibration signal information of the vibration source 10 is compared with the preset threshold, and the magnitude of the current provided to the vibration source 10 is further controlled according to the comparison result.

For example, the amplitude of the mover 12 obtained by the displacement sensor 30 is 18 μm (or the acceleration of the mover obtained by the acceleration sensor is 30 m/s ² ), and the preset threshold for displacement in the controller 20 is 20 μm (or the preset threshold for acceleration). is 35m/s ² ), when the controller 20 receives the data sent by the displacement sensor (or the acceleration sensor), it compares the acquired data with the preset threshold, and the comparison result is that the amplitude of the mover 12 is smaller than the preset The threshold value (or the value of the acceleration of the mover 12 is less than the preset threshold value), the controller 20 controls the current input to the vibration source 10 to increase it, because the amplitude of the mover 12 is less than the preset threshold value, that is, the external electric field strength or The strength of the AC magnetic field is weak, and it is necessary to enhance the strength of the external electric field or the strength of the AC magnetic field to make the vibration amplitude (or vibration acceleration) of the vibration source 10 equal to the preset threshold, so that by controlling the magnitude of the current entering the vibration source 10, It is achieved to control the amplitude (or acceleration) of the vibration source 10 to remain constant.

It should be noted that the second derivative of the displacement can obtain the corresponding acceleration. Conversely, the quadratic integral of the acceleration yields the corresponding displacement.

2 is a schematic structural diagram of a control system in a vibration excitation device provided by an embodiment of the present invention, wherein the sensor 30 is connected to the mover in the vibration source 10, and is also electrically connected to the 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 obtains the data sent by the sensor 30 and compares it with the preset threshold. At or below the preset threshold, the controller 20 controls the strength of the external electric field or the alternating magnetic field by controlling the magnitude of the current input to the vibration source 10 , so as to control the amplitude and acceleration of the vibration source 10 to keep constant.

It should be noted that, first, in this embodiment, the vibration source 10 is vibrated under the action of an electric field or an AC magnetic field. By controlling the strength and frequency of the external electric field or the strength and frequency of the AC magnetic field, the amplitude and frequency of the vibration source 10 are controlled. constant acceleration.

Second, in this embodiment, during the vibration process of the vibration source 10 , the amplitude and acceleration information of the vibration source 10 is acquired through 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 this application is used to provide vibration to the blood analyzer, the items of coagulation analysis and inspection are widely used in the diagnosis of hemorrhage, thrombotic diseases and prethrombotic state, observation of curative effect, anticoagulation drug dosage and prognosis analysis, various primary or secondary Diagnosis and curative effect observation of sexual fibrinolysis. Automatic coagulation analysis refers to the analysis of relevant components in hemostasis and thrombus system by automatic coagulation analyzer or other analyzers and applied to the diagnosis, treatment and prognosis judgment of bleeding and thrombotic diseases; Thrombosis item examination becomes simple and accurate, and can produce a number of accurate quantitative results. Therefore, it is necessary to keep the vibration amplitude and vibration force of the vibration source 10 constant.

For example, the vibration source 10 vibrates under the action of an alternating magnetic field. If the stator 11 is a coil and the mover 12 is a magnet, an alternating current is supplied to the coil to cooperate with the magnet to generate an alternating magnetic field. Under the action, the magnet reciprocates relative to the coil. If the preset amplitude required by the blood analyzer is 20 μm, when the sensor 30 acquires the amplitude of the magnet higher than 20 μm, the controller 20 realizes the control of the magnet through the current of the alternating current. The amplitude of the magnet is kept at 20 μm; similarly, if the sensor 30 acquires the amplitude of the magnet less than 20 μm, the controller 20 increases the current by controlling the alternating current to keep the amplitude of the control magnet at 20 μm. The amplitude or acceleration collected by the sensor 30 is compared with a preset threshold, and the intensity and frequency of the magnetic field are controlled according to the comparison result, so that the amplitude and acceleration of the vibration source 10 are controlled to remain constant.

In the vibration excitation device provided by the embodiment of the present invention, the intensity and frequency of the external electric field or the intensity and frequency of the alternating magnetic field are adjusted by the controller, thereby keeping the amplitude and acceleration of the vibration source constant. Specifically, the vibration excitation device is composed of a vibration source 10, a sensor 30 and a controller 20, wherein the vibration source 10 is electrically connected to the controller 20, the vibration source 10 is composed of a stator 11 and a mover 12, and the vibration is realized by the mover 12 reciprocates relative to the stator 11 under the action of an alternating magnetic field or an external electric field. In terms of structural connection, the mover 12 is used to connect an external coagulation analyzer to drive the coagulation analyzer to move, and the sensor 30 is arranged on the mover 12 to collect the amplitude and 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 strength and frequency of the applied alternating magnetic field or the strength and frequency of the external electric field, so that the amplitude and acceleration of the coagulation analyzer are kept constant.

In this embodiment, a solution for controlling the amplitude and acceleration of the vibration source 10 to keep constant by controlling the strength and frequency of the alternating magnetic field is given. Optionally, the stator 11 and the mover 12 are coils and are inserted into the coils The permanent magnet applies alternating current to the coil to reciprocate between the coil and the permanent magnet.

Among them, the above-mentioned solution has two implementations, one is that the stator 11 is a coil, and the mover 12 is a permanent magnet. The second is that the stator 11 is a permanent magnet, and the mover 12 is a coil.

It should be noted that, first, permanent magnets, ie permanent magnets, may be natural products, also known as natural magnets, or artificially manufactured. A material with a wide hysteresis loop, high coercivity, and high remanence that can maintain a constant magnetism once magnetized.

Second, coils generally refer to toroidal windings of wire. The coil in the circuit refers to the inductor. The wires are wound one by one, and the wires are insulated from each other. The insulating tube can be hollow, or it can contain an iron core or a magnetic powder core, which is called inductance for short. Inductance can be divided into fixed inductance and variable inductance, fixed inductance coil referred to as inductance or coil.

Third, when an alternating current is passed through the coil, a changing alternating magnetic field will be generated, which will interact with the permanent magnet to generate vibration.

The above shows that the vibration source 10 vibrates under the action of the alternating magnetic field. In this embodiment, optionally, the permanent magnet is in a U-shaped structure, and the coils include two first coils arranged in parallel, and two of the U-shaped structure. The side walls are respectively inserted into the two first coils.

It should be noted that the permanent magnets of the U-shaped structure can be inserted into the two coils at the same time to increase the strength of the alternating magnetic field. Because the strength of the alternating magnetic field is related to the magnitude of the current, the characteristics of the coil and the magnetic core, the characteristics of the coil include: the number of turns of the coil and the shape of the coil, such as planar coils, solenoids, etc. Magnetic cores are not only magnetic materials, but also materials that are placed inside or near the coil, such as air and ceramics.

When there are two first coils, it is necessary to provide a bottom plate 15 for connecting the two first coils.

A U-shaped permanent magnet and two coils are given above. In this embodiment, optionally, two U-shaped permanent magnets and at least one coil are given. The permanent magnet includes two first coils arranged in parallel. The magnet, the two first magnets are respectively inserted in the coil, the first magnet is in a U-shaped structure, and the adjacent side walls of the two U-shaped structures are respectively located in the coil.

It should be noted that the adjacent side walls of the two U-shaped structures are inserted into the coil, which can improve the strength of the alternating magnetic field under the condition of the same current size.

FIG. 3 is a schematic structural diagram of a vibration excitation device provided by an embodiment of the present invention. Optionally, please refer to FIG. 3 , the vibration excitation device further includes a connecting plate 13, one side of the connecting plate 13 is fixedly connected with the mover 12, and the other side is fixedly connected. For fixed setting of sensor 30 and coagulation analyzer.

It should be noted that, in order to improve the stability of the connection between the sensor 30 and the coagulation analyzer and the mover 12, it is necessary to provide a connecting plate 13, which also provides a connecting space for other connecting components, which will not be repeated here.

Referring to FIG. 3 , in order to prevent the coil and the permanent magnet from being separated, in this embodiment, optionally, the vibration excitation device further includes a plurality of elastic members 14 distributed on the outer periphery of the vibration source 10 , and one end of the plurality of elastic members 14 is connected to the The connecting plate 13 is connected, and the other end is connected with the stator 11 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, it will not control the alternating current of the input coil. When the alternating current is too large, the alternating magnetic field intensity generated by the coil and the permanent magnet is relatively large. Under the action, the amplitude generated by the vibration source 10 will be larger, 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 expansion and contraction amount of the elastic member 14 can prevent the permanent magnet and the coil from being detached.

FIG. 4 is the second structural schematic diagram of the vibration excitation device provided by the embodiment of the present invention. Optionally, referring to FIG. 4 , the reciprocating motion of the mover 12 relative to the stator 11 is realized by controlling the intensity of the alternating current electric field. Specifically, the stator 11 and the mover 12 are respectively a piezoelectric ceramic 40 and a casing 41 sleeved on the piezoelectric ceramic 40 , and an alternating voltage and frequency are applied to the piezoelectric ceramic 40 to deform the piezoelectric ceramic 40 to relatively Reciprocating movement on the housing 41 .

It should be noted that the piezoelectric ceramic 40 is an information functional ceramic material that can convert mechanical energy and electrical energy to each other - piezoelectric effect. The piezoelectric ceramic 40 has not only piezoelectric properties, but also dielectric properties and elasticity. The dielectric property of the piezoelectric ceramic 40 reflects the degree of response of the ceramic material to an external electric field. For example, audio components such as piezoelectric ceramic speakers require the dielectric constant of the ceramic to be large, while high-frequency piezoelectric ceramic components require the dielectric constant of the material. constants are small. The elastic coefficient of piezoelectric ceramics is a parameter that reflects the relationship between the deformation of the ceramics and the applied force. Like other elastomers, piezoelectric ceramic materials obey Hooke's law.

Among them, bound charges will appear at both ends of the polarized piezoelectric ceramic sheet, so a layer of free charges from the outside world is adsorbed on the electrode surface. When an external pressure is applied to the ceramic sheet, discharge occurs at both ends of the ceramic sheet. On the contrary, if it is pulled, the charging phenomenon will occur. The phenomenon in which this mechanical effect is transformed into an electrical effect belongs to the positive piezoelectric effect.

In addition, the piezoelectric ceramic 40 has the property of spontaneous polarization, and the spontaneous polarization can be transformed under the action of an external electric field. Therefore, when an external electric field is applied to the piezoelectric dielectric, the change occurs, and the piezoelectric ceramic 40 is deformed. The reason why the piezoelectric ceramic 40 is deformed is that the same external electric field as the spontaneous polarization is applied, which is equivalent to enhancing the polarization strength. The increase of the polarization strength makes the piezoelectric ceramic sheet elongate in the polarization direction. On the contrary, if a reverse electric field is applied, the ceramic sheet shortens in the polarization direction. This phenomenon, which is converted into a mechanical effect due to an electrical effect, is the inverse piezoelectric effect. In this embodiment, the inverse piezoelectric effect is used.

Further, the piezoelectric ceramic 40 includes a plurality of piezoelectric ceramic sheets, and the plurality of piezoelectric ceramic sheets are stacked in sequence along the vibration direction of the mover 12 .

It should be noted that the piezoelectric ceramic sheet, commonly known as the buzzer sheet, will produce mechanical deformation with the change of voltage and frequency when a voltage is applied to the piezoelectric ceramic. On the other hand, when the piezoelectric ceramic sheet is vibrated, an electric charge is generated. Using this principle, a vibrator can be formed by two piezoelectric ceramic sheets or a piezoelectric ceramic sheet and a metal sheet.

Further, it can be seen from the above that the piezoelectric ceramic 40 is a plurality of piezoelectric ceramic sheets. When the piezoelectric ceramic sheets are deformed under the action of an external electric field, the piezoelectric ceramic sheets are easily dispersed. If the situation occurs, the vibration excitation device in this embodiment also includes a preloading system. The preloading system includes a preloading block 42 and a preloading member 43. The preloading block 42 is fixedly connected to the base of the housing 41, and the preloading member 43 is arranged away from the base. On the inner wall of the housing 41, a preload 43 is used to prevent the plurality of piezoelectric ceramic sheets from being scattered when the current is connected.

For example, in this embodiment, the number of piezoelectric ceramic sheets is 10, and the side of the piezoelectric ceramic sheets close to the base of the housing 41 is fixed by a preload block 42, and the preload block 42 is fixedly connected to the housing 41. When the housing 41 faces away from the preload One side of the block 42 is provided with a pretensioner 43, one end of the pretensioner 43 is fixedly connected to the inner wall of the housing 41, and the other end is disposed at one end of the plurality of piezoelectric ceramic sheets away from the pretensioner block 42, and the pretensioner 43 can be an elastic wire , elastic rods, which will not be repeated here.

Optionally, in order to improve the installation stability of the sensor and the coagulation analyzer, the vibration excitation device further includes a connecting rod 44, one end of the connecting rod 44 is connected to the piezoelectric ceramic 40, and the other end is used to fix the sensor 30 and the coagulation analyzer.

Optionally, the sensor 30 in this embodiment is a displacement sensor and/or an acceleration sensor.

It should be noted that, if the sensor 30 is a displacement sensor, the corresponding acceleration can be obtained by performing quadratic differentiation on the obtained displacement. If the sensor 30 is an acceleration sensor, the corresponding displacement can be obtained by quadratic integration of the obtained acceleration data. If the sensor 30 is a displacement sensor and an acceleration sensor, the corresponding displacement and acceleration can be obtained directly by acquiring the data collected by the displacement sensor and the acceleration sensor.

In the vibration excitation device provided by the embodiment of the present invention, the intensity of the alternating electric field or the intensity of the alternating magnetic field is adjusted by the controller 20, so as to keep the amplitude and acceleration of the vibration source 10 constant.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a vibration excitation device, is characterized in that, comprises: vibration source, sensor and controller, described vibration source is electrically connected with described controller, and described vibration source comprises stator and mover, and described mover is in the intersection. Under the action of a variable magnetic field or an external electric field, the mover reciprocates relative to the stator. The mover is used to connect an external coagulation analyzer to drive the coagulation analyzer to move. The controller adjusts the applied alternating magnetic field and frequency or external electric field strength and The frequency controls the amplitude and acceleration of the reciprocating motion of the mover relative to the stator, and the sensor is arranged on the mover to collect the amplitude and acceleration of the mover's motion. 2. The vibration excitation device according to claim 1, wherein the stator and the mover are respectively a coil and a permanent magnet inserted in the coil, and an alternating current is applied to the coil to reciprocating between the coil and the permanent magnet. 3 . The vibration excitation device according to claim 2 , wherein the permanent magnet is in a U-shaped structure, the coil comprises two first coils arranged in parallel, and the two side walls of the U-shaped structure are respectively 3 . inserted into the two first coils. 4 . The vibration excitation device according to claim 2 , further comprising a connecting plate, one side of the connecting plate is fixedly connected with the mover, and the other side is used for fixedly setting the sensor and the coagulation analyzer. 5 . The vibration excitation device according to claim 4 , further comprising a plurality of elastic members distributed on the outer periphery of the vibration source, one end of the plurality of elastic members is connected to the connecting plate, and the other end is connected to the connecting plate. 6 . The stator is connected to provide a positioning buffer for the reciprocating motion between the stator and the mover. 6 . The vibration excitation device according to claim 1 , wherein the stator and the mover are piezoelectric ceramics and a shell sleeved on the piezoelectric ceramics respectively, and the piezoelectric ceramics are applied to the vibration excitation device according to claim 1 . alternating voltage and frequency to deform the piezoelectric ceramic to reciprocate relative to the housing. 7 . The vibration excitation device according to claim 6 , wherein the piezoelectric ceramic comprises a plurality of piezoelectric ceramic sheets, and the plurality of piezoelectric ceramic sheets are stacked in sequence along the vibration direction of the mover. 8 . 8 . The vibration excitation device according to claim 7 , further comprising a preloading system, the preloading system comprising a preloading block and a preloading piece, and the preloading block is fixedly connected to the base of the housing. 9 . , the preloading member is disposed on the inner wall of the casing away from the base, and the preloading member is used to prevent the plurality of piezoelectric ceramic sheets from being scattered when the current is connected. 9 . The vibration excitation device according to claim 6 , further comprising a connecting rod, one end of the connecting rod is connected to the piezoelectric ceramic, and the other end is used to fix the sensor and the coagulation analyzer. 10 . . 10. The vibration excitation device according to claim 1, wherein the sensor is a displacement sensor and/or an acceleration sensor.

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