CN111595231A - Piezoelectric type vibration displacement measuring sensor - Google Patents

Piezoelectric type vibration displacement measuring sensor Download PDF

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Publication number
CN111595231A
CN111595231A CN202010582242.1A CN202010582242A CN111595231A CN 111595231 A CN111595231 A CN 111595231A CN 202010582242 A CN202010582242 A CN 202010582242A CN 111595231 A CN111595231 A CN 111595231A
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CN
China
Prior art keywords
fixedly connected
piezoelectric
sleeve
plate
vibroseis
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CN202010582242.1A
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Chinese (zh)
Inventor
孙军
林国栋
陈帅
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Yangzhou Xiyuan Electronic Technology Co ltd
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Yangzhou Xiyuan Electronic Technology Co ltd
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Priority to CN202010582242.1A priority Critical patent/CN111595231A/en
Publication of CN111595231A publication Critical patent/CN111595231A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The invention relates to the technical field of displacement sensors and discloses a piezoelectric vibration measurement displacement sensor which comprises a two-core connector, wherein the bottom of the two-core connector is fixedly connected with an outer shell, the inside of the outer shell is fixedly connected with a signal conditioning circuit, the top of the signal conditioning circuit is electrically connected with the two-core connector through a connecting wire, the bottom of the signal conditioning circuit is fixedly connected with an inner shell, the inside of the inner shell is fixedly connected with a mass block, the inner side of the mass block is fixedly connected with a sensitive element, the bottom of the inner shell is fixedly connected with a core body, the bottom of the core body is fixedly connected with an insulating plate, the bottom of the outer shell is fixedly connected with a base, and the top of the mass block. This vibrations displacement sensor is measured to piezoelectric type, not only the dismouting is simple and convenient, need not external instrument simultaneously and assists the dismouting, and labour saving and time saving is convenient for maintain this displacement sensor, and easy operation is applicable to various circumstances.

Description

Piezoelectric type vibration displacement measuring sensor
Technical Field
The invention relates to the technical field of displacement sensors, in particular to a piezoelectric type vibration measurement displacement sensor.
Background
The displacement sensor is also called as linear sensor, and is a linear device belonging to metal induction, and its function is to convert various measured physical quantities into electric quantity, and in the course of production, the measurement of displacement is generally divided into two kinds of measurement of physical size and mechanical displacement, and according to the different form of measured variable conversion, the displacement sensor can be divided into two kinds of analog type and digital type, and the analog type can be divided into two kinds of physical type and structural type.
A common displacement sensor is of an analog structure type and mainly comprises a potentiometer type displacement sensor, an inductive type displacement sensor, an synchro, a capacitive type displacement sensor, an eddy current type displacement sensor, a Hall type displacement sensor and the like, for example, CN 105952714B discloses an external displacement sensor for dynamic testing of a hydraulic cylinder, the displacement sensor is vertically limited and slidably mounted in a sleeve through the mutual matching of a sliding sleeve and a guide cylinder in the sleeve on a mounting seat, a firing pin at the upper end of the displacement sensor is pressed on the bottom surface of a pressing block, the pressing block is connected with the bottom surface of the hydraulic cylinder through a screw, a pressing plate and a fixing bolt, a piston of the hydraulic cylinder moves in a small range, and the pressing plate and the pressing block touch the firing pin, so that the displacement sensor outputs a plurality of signals which can be stored, analyzed or used for drawing curves and the like, thereby achieving the purposes, the requirement of small environment to the field usage is lower, the measuring accuracy is high, clamp plate length is adjustable, the placing mode and the position of pneumatic cylinder are nimble, be applicable to the purpose of the test of various model pneumatic cylinder dynamic properties, but it still has the inconvenient shortcoming of dismouting, fix through the bolt, at the in-process of dismouting, not only need the external instrument to assist the dismouting, and waste time and energy, be not convenient for maintain the displacement sensor and change, influence its availability factor, so propose above-mentioned piezoelectric type measurement vibrations displacement sensor in order to solve above-mentioned problem.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the piezoelectric type vibration measurement displacement sensor provided by the invention has the advantages of convenience in disassembly and assembly and the like, and solves the problems that the use efficiency is influenced because the displacement sensor is fixed through a bolt, and in the disassembly and assembly process, the disassembly and assembly are assisted by an external tool, the time and labor are wasted, and the maintenance and the replacement of the displacement sensor are inconvenient.
(II) technical scheme
In order to realize the purpose of convenient disassembly and assembly, the invention provides the following technical scheme: a piezoelectric vibration displacement sensor for measurement comprises a two-core connector, wherein the bottom of the two-core connector is fixedly connected with an outer shell, the inside of the outer shell is fixedly connected with a signal conditioning circuit, the top of the signal conditioning circuit is electrically connected with the two-core connector through a connecting wire, the bottom of the signal conditioning circuit is fixedly connected with an inner shell, the inside of the inner shell is fixedly connected with a mass block, the inner side of the mass block is fixedly connected with a sensitive element, the bottom of the inner shell is fixedly connected with a core body, the bottom of the core body is fixedly connected with an insulating plate, the bottom of the outer shell is fixedly connected with a base, the top of the mass block is fixedly connected with a conducting plate, the bottom of the base is fixedly connected with a bottom plate, the bottom of the bottom plate is fixedly connected with an inserting rod, the outer, the utility model discloses a fixed slot, including the left top of fixed slot and the equal fixedly connected with in bottom on right side, the equal fixedly connected with external screw thread in bottom on left top of inserted bar and right side, the external screw thread meshes with the internal thread mutually, both ends all mesh has the thread bush about installation piece top, the inboard threaded connection of thread bush has the screw rod, the top fixedly connected with butt joint board of screw rod, the bottom fixedly connected with sleeve of fixed slot, the bottom fixedly connected with spring of sleeve inner chamber, the top fixedly connected with connecting plate of spring, the top fixedly connected with slide bar of connecting plate, the bottom fixedly connected with mounting panel of installation piece, equal swing joint all around at mounting panel top has the construction bolt, the butt joint hole has all been seted up at both ends about the bottom plate bottom, the constant head tank has been seted.
Preferably, the fixing groove is elliptical, and the fixing groove is inclined, and the inclination direction is inclined from bottom to top to right side with the vertical line as a reference.
Preferably, the inner side of the threaded sleeve is provided with a thread groove, and the thread groove is matched with the thread on the outer surface of the screw rod.
Preferably, the abutting plate is located inside the abutting hole, and the abutting plate and the abutting hole abut against each other.
Preferably, the outer side of the connecting plate is connected with the inner wall of the sleeve in a sliding mode, and the top of the sliding rod penetrates through the sleeve and extends to the outer portion of the sleeve and is connected with the sleeve in a sliding mode.
Preferably, the locating slot is a semicircular locating slot, and the mounting block is a cylinder with a slot inside.
Preferably, the top of the slide bar is fixedly connected with a roller, and the upper part of the roller is located inside the positioning groove and is in sliding connection with the positioning groove.
Preferably, the outer surface of the screw is fixedly connected with a rotating disc, and the two thread sleeves are respectively positioned at the left end and the right end of the top of the fixing groove.
Preferably, the top of the conducting strip is fixedly connected with the bottom of the signal conditioning circuit, and the bottom of the insulating plate is fixedly connected with the top of the inner side of the base.
(III) advantageous effects
Compared with the prior art, the invention provides a piezoelectric type vibration displacement measuring sensor which has the following beneficial effects:
1. the piezoelectric vibration displacement sensor for measuring realizes the limit of the upper position and the lower position of the inserted link by the meshing of the external thread and the internal thread, simultaneously, the abutting plate is abutted against the abutting hole and exerts abutting force upwards, the spring exerts elastic force upwards and abuts against the inserted link to realize the limit of the left position and the right position of the inserted link, when the piezoelectric vibration displacement sensor needs to be disassembled, the rotating disc is twisted and the screw rod is driven to move downwards until the bottom of the rotating disc is abutted against the top of the thread sleeve, the height of the screw rod is reduced, then the inserted link is inclined towards the right side, so that the external thread is not meshed with the internal thread, the inserted link is moved upwards, the separation between the inserted link and the mounting block can be realized, when the piezoelectric vibration displacement sensor needs to be installed, the inserted link is inserted into the fixed groove in an inclined manner, the bottom of the inserted link is contacted with the roller, then the inserted link is gradually pushed into a vertical, then rotate the rotary disk for the butt board is in the butt downthehole, and realize whole installation, and the device is not only easy and simple to handle, need not external instrument simultaneously and assists the dismouting, and labour saving and time saving is convenient for maintain this displacement sensor, and easy operation is applicable to various circumstances.
2. The piezoelectric type vibration measurement displacement sensor is characterized in that a sensitive element is fixed on a core body through a mass block by an external compression screw and a compression nut, the mass block is connected with the sensitive element by a conducting strip and applies 150Kg of pretightening force to form a sensitive element assembly, the sensitive element assembly and an inner shell are screwed by epoxy glue and are isolated from a base by an insulating plate and are bonded by high-temperature glue, a signal conditioning circuit is fixed on the inner shell and is connected with the sensitive element assembly by an enameled wire, and a two-core connector is connected with the signal conditioning circuit by a connecting wire and is fixed on the base by a laser welding method, so that the displacement sensor is assembled.
Drawings
FIG. 1 is a schematic structural diagram of a piezoelectric vibration displacement sensor according to the present invention;
FIG. 2 is an enlarged view of the point A in FIG. 1 of the piezoelectric type sensor for measuring vibration displacement according to the present invention;
fig. 3 is a top view of the connection between the mounting hole, the fixing groove and the insertion rod of the piezoelectric vibration displacement sensor according to the present invention.
In the figure: the device comprises a two-core connector 1, a connecting wire 2, an outer shell 3, a signal conditioning circuit 4, a mass block 5, an inner shell 6, a sensitive element 7, a core 8, an insulating plate 9, a base 10, a conducting strip 11, a bottom plate 12, an inserted rod 13, a mounting block 14, a fixing groove 15, an internal thread 16, an external thread 17, a thread sleeve 18, a screw rod 19, an abutting plate 20, a sleeve 21, a spring 22, a connecting plate 23, a sliding rod 24, a mounting plate 25, a mounting bolt 26, an abutting hole 27 and a positioning groove 28.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-3, a piezoelectric vibration displacement sensor comprises a two-core connector 1, an outer shell 3 is fixedly connected to the bottom of the two-core connector 1, a signal conditioning circuit 4 is fixedly connected to the inside of the outer shell 3, the top of the signal conditioning circuit 4 is electrically connected to the two-core connector 1 through a connecting wire 2, an inner shell 6 is fixedly connected to the bottom of the signal conditioning circuit 4, a mass block 5 is fixedly connected to the inside of the inner shell 6, a sensing element 7 is fixedly connected to the inner side of the mass block 5, a core 8 is fixedly connected to the bottom of the inner shell 6, an insulating plate 9 is fixedly connected to the bottom of the core 8, a base 10 is fixedly connected to the bottom of the outer shell 3, a conductive plate 11 is fixedly connected to the top of the mass block 5, the top of the conductive plate 11 is fixedly connected to the bottom of the signal conditioning circuit 4, and the bottom of the, the bottom of the base 10 is fixedly connected with a bottom plate 12, the bottom of the bottom plate 12 is fixedly connected with an inserted link 13, the outer surface of the inserted link 13 is movably connected with an installation block 14, the inside of the installation block 14 is provided with a fixed groove 15, the fixed groove 15 is elliptical, the fixed groove 15 is inclined, the inclination direction inclines from bottom to top to right side with the vertical line as the reference, the top of the left side of the fixed groove 15 and the bottom of the right side are both fixedly connected with internal threads 16, the top of the left side of the inserted link 13 and the bottom of the right side are both fixedly connected with external threads 17, the external threads 17 are meshed with the internal threads 16, the left end and the right end of the top of the installation block 14 are both meshed with thread sleeves 18, the inner side of the thread sleeves 18 are connected with screw rods 19, the outer surface of the screw rods 19 is fixedly connected with a rotating disk, the two, the top of the screw rod 19 is fixedly connected with a butt plate 20, the bottom of the fixed groove 15 is fixedly connected with a sleeve 21, the bottom of the inner cavity of the sleeve 21 is fixedly connected with a spring 22, the top of the spring 22 is fixedly connected with a connecting plate 23, the top of the connecting plate 23 is fixedly connected with a slide rod 24, the outer side of the connecting plate 23 is in sliding connection with the inner wall of the sleeve 21, the top of the slide rod 24 penetrates through and extends to the outside of the sleeve 21 and is in sliding connection with the sleeve 21, the bottom of the mounting block 14 is fixedly connected with a mounting plate 25, the periphery of the top of the mounting plate 25 is movably connected with mounting bolts 26, the left end and the right end of the bottom plate 12 are respectively provided with a butt hole 27, the butt plate 20 is positioned inside the butt hole 27, the butt plate 20 is mutually butted with the butt hole 27, the bottom of the inserting rod 13, the upper part of the roller is positioned in the positioning groove 28 and is in sliding connection with the positioning groove 28, the upper and lower positions of the inserted rod 13 are limited by the engagement of the external thread 17 and the internal thread 16, meanwhile, the abutting plate 20 is abutted against the abutting hole 27 and exerts abutting force upwards, the spring 22 exerts elastic force upwards and abuts against the inserted rod 13, the left and right positions of the inserted rod 13 are limited, when the disassembly is required, the rotating disc is twisted, the screw rod 19 is driven to move downwards until the bottom of the rotating disc is abutted against the top of the thread sleeve 18, the height of the screw rod 19 is reduced, then the inserted rod 13 is inclined towards the right side, the external thread 17 is not engaged with the internal thread 16, the inserted rod 13 is moved upwards, the separation between the inserted rod 13 and the mounting block 14 can be realized, when the assembly is required, the inserted rod 13 is inserted into the fixing groove 15 in an inclined shape, and the bottom of the inserted rod 13 is contacted with the, then the inserted link 13 is gradually pushed to be vertical, so that the roller moves to the positioning groove 28, the external thread 17 is meshed with the internal thread 16, then the rotating disc is rotated, the abutting plate 20 is positioned in the abutting hole 27, the whole installation process is realized, the device is not only simple and convenient to assemble and disassemble, but also does not need an external tool to assist in assembling and disassembling, time and labor are saved, the displacement sensor is convenient to maintain, the operation is simple, the device is suitable for various conditions, the sensitive element 7 is fixed on the core body 8 through the mass block 5 by an external compression screw rod and a compression nut, the mass block 5 is connected with the sensitive element 7 by the conducting strip 11, 150Kg of pretightening force is applied to form a sensitive element assembly, the sensitive element assembly and the inner shell 6 are separated from the base 10 by the insulating plate 9 after being screwed by epoxy glue and are bonded by high-temperature glue, the signal conditioning circuit 4 is fixed on the inner shell 6, the two-core connector 1 is connected with the signal conditioning circuit 4 through the connecting wire 2 and is fixed on the base 10 by a laser welding method, so that the displacement sensor is assembled simply, conveniently and quickly, all parts are distributed reasonably, the structure is simple, the cost is low, and the use of a user is easy.
To sum up, the piezoelectric vibration displacement sensor for measuring realizes the limit of the up and down position of the inserted link 13 by the engagement of the external thread 17 and the internal thread 16, meanwhile, the abutting plate 20 abuts against the abutting hole 27 and exerts abutting force upwards, the spring 22 exerts elastic force upwards and abuts against the inserted link 13 to realize the limit of the left and right position of the inserted link 13, when the disassembly is needed, the rotating disc is twisted and the screw rod 19 is driven to move downwards until the bottom of the rotating disc is attached to the top of the thread bush 18, the height of the screw rod 19 is reduced, then the inserted link 13 is inclined towards the right side, so that the external thread 17 is not engaged with the internal thread 16, and the inserted link 13 is moved upwards, thus the separation between the inserted link 13 and the installation block 14 can be realized, when the installation is needed, the inserted link 13 is inserted into the fixed groove 15 in an inclined shape, the bottom of the inserted link 13 is contacted with the roller, then the inserted link 13 is gradually pushed to be in a, make in the gyro wheel removes constant head tank 28, external screw thread 17 meshes with internal thread 16 mutually simultaneously, then rotates the rotary disk for butt joint board 20 is in butt joint hole 27, and realizes whole installation, and the device is not only the dismouting simple and convenient, need not external tool simultaneously and assists the dismouting, and labour saving and time saving is convenient for maintain this displacement sensor, and easy operation is applicable to various circumstances.
Moreover, the sensitive element 7 is fixed on the core body 8 by an external compression screw rod and a compression nut through the mass block 5, the mass block 5 is connected with the sensitive element 7 by a conducting strip 11, and 150Kg of pretightening force is applied to form a sensitive element assembly, the sensitive element assembly is tightly screwed with the inner shell 6 by epoxy glue and is isolated from the base 10 by an insulating plate 9 and is bonded by high-temperature glue, the signal conditioning circuit 4 is fixed on the inner shell 6 and is connected with the sensitive element assembly by an enameled wire, the two-core connector 1 is connected with the signal conditioning circuit 4 by a connecting wire 2 and is fixed on the base 10 by a laser welding method, thereby realizing the assembly of the displacement sensor, the assembly mode of the displacement sensor is simple and rapid, all the components are reasonably distributed, the structure is simple, the cost is low, the use of a user is easy, the problem of fixing through bolts is solved, and in the disassembly and assembly process, an external, and the problems of time and labor waste, inconvenience in maintenance and replacement of the displacement sensor and influence on the use efficiency of the displacement sensor are solved.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a vibrations displacement sensor is measured to piezoelectric type, includes two core connectors (1), its characterized in that: the bottom of the two-core connector (1) is fixedly connected with an outer shell (3), the inner part of the outer shell (3) is fixedly connected with a signal conditioning circuit (4), the top of the signal conditioning circuit (4) is electrically connected with the two-core connector (1) through a connecting wire (2), the bottom of the signal conditioning circuit (4) is fixedly connected with an inner shell (6), the inner part of the inner shell (6) is fixedly connected with a mass block (5), the inner side of the mass block (5) is fixedly connected with a sensitive element (7), the bottom of the inner shell (6) is fixedly connected with a core body (8), the bottom of the core body (8) is fixedly connected with an insulating plate (9), the bottom of the outer shell (3) is fixedly connected with a base (10), the top of the mass block (5) is fixedly connected with a conducting plate (11), and the bottom of the base (10), the bottom of the bottom plate (12) is fixedly connected with an inserted bar (13), the outer surface of the inserted bar (13) is movably connected with an installation block (14), a fixed groove (15) is formed in the installation block (14), the left top of the fixed groove (15) and the bottom of the right side are fixedly connected with an internal thread (16), the left top of the inserted bar (13) and the bottom of the right side are fixedly connected with an external thread (17), the external thread (17) is meshed with the internal thread (16), the left end and the right end of the top of the installation block (14) are respectively meshed with a thread sleeve (18), the inner side of each thread sleeve (18) is connected with a screw rod (19), the top of each screw rod (19) is fixedly connected with a butt plate (20), the bottom of the fixed groove (15) is fixedly connected with a sleeve (21), and the bottom of the inner cavity of each, the top fixedly connected with connecting plate (23) of spring (22), the top fixedly connected with slide bar (24) of connecting plate (23), the bottom fixedly connected with mounting panel (25) of installation piece (14), equal swing joint all around at mounting panel (25) top has construction bolt (26), butt hole (27) have all been seted up at both ends about bottom plate (12) bottom, constant head tank (28) have been seted up to the bottom of inserted bar (13).
2. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the fixing groove (15) is oval, the fixing groove (15) is inclined, and the inclination direction is inclined from bottom to top to right side by taking the vertical line as a reference.
3. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the inner side of the threaded sleeve (18) is provided with a threaded groove, and the threaded groove is matched with threads on the outer surface of the screw rod (19).
4. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the abutting plate (20) is located inside the abutting hole (27), and the abutting plate (20) and the abutting hole (27) are abutted to each other.
5. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the outer side of the connecting plate (23) is connected with the inner wall of the sleeve (21) in a sliding mode, and the top of the sliding rod (24) penetrates through the sleeve (21) and extends to the outside of the sleeve (21) and is connected with the sleeve (21) in a sliding mode.
6. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the positioning groove (28) is a semicircular positioning groove, and the mounting block (14) is cylindrical with a groove in the inner part.
7. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the top of slide bar (24) fixedly connected with gyro wheel, the top of gyro wheel is located the inside of constant head tank (28) and with constant head tank (28) sliding connection.
8. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the outer surface of the screw rod (19) is fixedly connected with a rotating disk, and the two thread sleeves (18) are respectively positioned at the left end and the right end of the top of the fixing groove (15).
9. The piezoelectric vibroseis displacement transducer of claim 1, wherein: the top of the conducting strip (11) is fixedly connected with the bottom of the signal conditioning circuit (4), and the bottom of the insulating plate (9) is fixedly connected with the top of the inner side of the base (10).
CN202010582242.1A 2020-06-23 2020-06-23 Piezoelectric type vibration displacement measuring sensor Pending CN111595231A (en)

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Application Number Priority Date Filing Date Title
CN202010582242.1A CN111595231A (en) 2020-06-23 2020-06-23 Piezoelectric type vibration displacement measuring sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010582242.1A CN111595231A (en) 2020-06-23 2020-06-23 Piezoelectric type vibration displacement measuring sensor

Publications (1)

Publication Number Publication Date
CN111595231A true CN111595231A (en) 2020-08-28

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Application Number Title Priority Date Filing Date
CN202010582242.1A Pending CN111595231A (en) 2020-06-23 2020-06-23 Piezoelectric type vibration displacement measuring sensor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112556809A (en) * 2020-12-18 2021-03-26 宜春万申制药机械有限公司 Dustless medicine quantitative weighing equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112556809A (en) * 2020-12-18 2021-03-26 宜春万申制药机械有限公司 Dustless medicine quantitative weighing equipment

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