1. An electrochemical detection device based on vibration mode, characterized in that: comprises a chute fixing seat (1), a sliding block (3), a piezoelectric actuator (4), a capacitance fixer (5), a distance adjusting ring (7), a capacitance displacement sensor (8), an excitation piezoelectric ceramic ring (9), an upper fixing ring (10), a positioning screw (11), a flexible hinge (12), a lower fixing ring (13) and a nano electrode probe (18), wherein the sliding block (3) is vertically arranged on the chute fixing seat (1) in a sliding way, the chute fixing seat (1) is provided with a fastening bolt (2) which can fasten the sliding block (3), the piezoelectric actuator (4) is vertically fixed on the sliding block (3), the upper end of the capacitance fixer (5) is screwed and fixed at the bottom of the piezoelectric actuator (4), the lower end of the capacitance fixer (5) is of a hollow structure and is provided with an internal thread, the upper end of the distance adjusting ring (7) is provided with an external thread which is screwed and matched with the lower end of the capacitance fixer (5), the capacitance displacement sensor (8) is rod-shaped, the upper end of the capacitance displacement sensor passes through the distance adjusting ring (7) and is vertically inserted into the capacitance fixer (5), the capacitance fixer (5) is provided with a locking screw (6) which can lock and position the capacitance displacement sensor (8), the excitation piezoelectric ceramic ring (9) is fixedly bonded at the bottom of the distance adjusting ring (7), the flexible hinge (12) is fixedly clamped between the upper fixing ring (10) and the lower fixing ring (13), the edge of the flexible hinge (12) is fixed with the conducting strip (14) and is connected with the external lead (15), the upper fixing ring (10) is fixedly bonded at the bottom of the excitation piezoelectric ceramic ring (9), the upper end of the positioning screw (11) is clamped at a through hole arranged at the center of the flexible hinge (12), the lower end of the positioning screw (11) is provided with a nut joint (16) which is tightly fixed with the flexible hinge (12), the nano electrode probe (18) is detachably fixed at the bottom of the nut joint (16).

2. A vibration mode based electrochemical detection device according to claim 1, wherein: the root of the nano electrode probe (18) is fixedly bonded with a protective sleeve (17), and the nut joint (16) is correspondingly provided with at least one group of clamping screws along the radial direction to clamp and fix the protective sleeve (17).

3. A vibration mode based electrochemical detection device according to claim 1, wherein: the piezoelectric actuator (4) is hollow packaging columnar piezoelectric ceramics.

4. A vibration mode based electrochemical detection device according to claim 1, wherein: the flexible hinge (12) is a cross flexible hinge or an annular inner single-arm flexible hinge.

Background

The electrochemical of the nano material effectively promotes the progress of electrochemical energy, however, the 'intrinsic' electrochemical property of the nano crystal is researched on the nano scale, the architecture relation of the electrocatalyst is revealed, and a great exploration space is still left for providing theoretical support for the interface construction of an energy device. The novel electrochemical systems exhibit some new features on the nanoscale: firstly, the nano-scale of materials and devices and the structure enable the space-time scale of various characteristics of the interface to be overlapped; secondly, in the nanometer field (the characteristic space size such as electrode spacing, pore diameter and the like are in the nanometer scale, such as less than 100nm), the unobvious functions and processes of some traditional macro electrochemical systems become prominent, and therefore the double electric layers of the interface and the charge transfer and transportation are influenced.

At present, most of electrodes adopted by electrochemical detection devices are super-microelectrodes, the diameters of the electrodes are in a micron level, information obtained by testing the electrodes is average information of a plurality of particle materials in a macro-micro scale, and in order to perform a nano-scale performance test, probes with the diameters in a nano level are required to be used, so that the electrochemical performance test requirement is met. When the conventional ultramicroelectrode is used, the influence of scratching, scratching and the like on the surface of a sample caused by a probe when the probe approaches the surface of the sample is usually considered, and when the nanometer electrode is used, the influence of excessive approach of the probe to the surface of the sample to damage a needle point is avoided when the probe approaches the surface of the sample, so that the problem of how to enable the nanometer electrode probe to approach the surface of the sample safely needs to be solved urgently.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an electrochemical detection device based on a vibration mode, which can enable a nano-electrode probe to approach the surface of a sample more accurately and safely, and the distance between a capacitive displacement sensor and a positioning screw for mounting the nano-electrode probe is convenient to adjust, so that the optimal use performance is ensured.

In order to achieve the purpose, the invention adopts the following technical scheme: an electrochemical detection device based on a vibration mode comprises a chute fixing seat, a sliding block, a piezoelectric actuator, a capacitor fixing device, a distance adjusting ring, a capacitive displacement sensor, an excitation piezoelectric ceramic ring, an upper fixing ring, a positioning screw, a flexible hinge, a lower fixing ring and a nano electrode probe, wherein the sliding block is vertically and slidably mounted on the chute fixing seat, the chute fixing seat is provided with a fastening bolt capable of fastening and fixing the sliding block, the piezoelectric actuator is vertically fixed on the sliding block, the upper end of the capacitor fixing device is fixedly connected to the bottom of the piezoelectric actuator in a threaded manner, the lower end of the capacitor fixing device is of a hollow structure and is provided with an internal thread, the upper end of the distance adjusting ring is provided with an external thread which is in threaded connection and matched with the lower end of the capacitor fixing device, the capacitive displacement sensor is rod-shaped, the upper end of the capacitive displacement sensor penetrates through the distance adjusting ring to be vertically inserted into the capacitor fixing device, the capacitor fixing device is provided with a locking screw capable of locking and positioning the capacitive displacement sensor, the excitation piezoelectric ceramic ring is fixedly bonded at the bottom of the distance adjusting ring, the flexible hinge clamp is fixedly arranged between the upper fixing ring and the lower fixing ring, the edge of the flexible hinge is fixedly provided with the conducting strip and is connected with an external lead, the upper fixing ring is fixedly bonded at the bottom of the excitation piezoelectric ceramic ring, the upper end of the positioning screw is clamped at a perforated hole formed in the center of the flexible hinge, the lower end of the positioning screw is provided with a nut joint and a flexible hinge fastening position, and the nano electrode probe is detachably fixed at the bottom of the nut joint.

Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable and stable integral structure, the installation mode of the sliding block and the sliding chute fixing seat is convenient to disassemble, the replacement of the nano electrode probe is facilitated, the fastening bolt is used for fastening and positioning the sliding block and simultaneously is convenient for primarily adjusting the height position of the nano electrode probe, the arrangement of the piezoelectric actuator and the excitation piezoelectric ceramic ring enables the nano electrode probe to approach the surface of a sample, the nano electrode probe is more accurate and safe, the stress direction is positioned on a vertical axis to reduce the torque of the piezoelectric actuator and the nano electrode probe during working, the distance between the capacitance displacement sensor and the positioning screw can be adjusted through the locking screw and the distance adjusting ring on the capacitance fixer, thereby achieving the best service performance, and the signal acquired by the nano electrode probe is led out through the conducting strip on the flexible hinge and the external conducting wire, and is convenient to be connected with an electrochemical analysis instrument.

Drawings

FIG. 1 is an isometric view of an assembled structure of a vibration mode based electrochemical test device of the present invention;

FIG. 2 is a front view of the vibration mode-based electrochemical detection device of the present invention;

fig. 3 is a sectional view a-a of fig. 2.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying 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 invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in fig. 1 to 3, an electrochemical detection device based on a vibration mode comprises a chute fixing seat 1, a slider 3, a piezoelectric actuator 4, a capacitor fixer 5, a distance adjusting ring 7, a capacitance type displacement sensor 8, an excitation piezoelectric ceramic ring 9, an upper fixing ring 10, a positioning screw 11, a flexible hinge 12, a lower fixing ring 13 and a nano electrode probe 18, wherein the slider 3 is vertically and slidably mounted on the chute fixing seat 1, the chute fixing seat 1 is provided with a fastening bolt 2 capable of fastening and positioning the slider 3, the piezoelectric actuator 4 is vertically fixed on the slider 3, the upper end of the capacitor fixer 5 is screwed and fixed at the bottom of the piezoelectric actuator 4, the lower end of the capacitor fixer 5 is of a hollow structure and is provided with an internal thread, the upper end of the distance adjusting ring 7 is provided with an external thread which is screwed and matched with the lower end of the capacitor fixer 5, the capacitor type displacement sensor 8 is of a rod shape, and the upper end of the capacitor type displacement sensor passes through the distance adjusting ring 7 and is vertically inserted and mounted inside the capacitor fixer 5, the capacitance fixer 5 is provided with a locking screw 6 and can lock and position the capacitance type displacement sensor 8, an excitation piezoelectric ceramic ring 9 is bonded and fixed at the bottom of a distance adjusting ring 7, a flexible hinge 12 is clamped and fixed between an upper fixing ring 10 and a lower fixing ring 13, a conducting strip 14 is fixed at the edge of the flexible hinge 12 and is connected with an external lead 15, the upper fixing ring 10 is bonded and fixed at the bottom of the excitation piezoelectric ceramic ring 9, the upper end of a positioning screw 11 is clamped at a perforation position formed in the center of the flexible hinge 12, a nut joint 16 is mounted at the lower end of the positioning screw 11 and is tightly fixed with the flexible hinge 12, and a nano electrode probe 18 is detachably fixed at the bottom of the nut joint 16.

Further, as shown in fig. 1, a protective sleeve 17 is fixedly bonded to the root of the nanoelectrode probe 18, and at least one set of clamping screws are correspondingly arranged along the radial direction of the nut connector 16 to clamp and fix the protective sleeve 17.

Further, as shown in fig. 1, the piezoelectric actuator 4 is a hollow package cylindrical piezoelectric ceramic.

Further, as shown in connection with FIG. 1, flexible hinge 12 is a criss-cross flexible hinge or a circular inner single-armed flexible hinge.

The method can enable the nano electrode probe 18 to approach the surface of a tested sample more accurately and safely in a vibration mode, thereby avoiding damage to the nano electrode probe 18, simultaneously being convenient to integrally disassemble, simple and feasible in structure, and being capable of matching with a three-dimensional piezoelectric displacement table and an electrolytic cell to realize electrochemical detection in various testing ranges. When in use, the chute fixing seat 1 is fixed on a Z axis of a workbench or a Z axis of a machine tool, the slide block 3 is moved in the vertical direction to carry out coarse adjustment on the height of the nano electrode probe 18, then the fastening bolt 2 is screwed down to fasten and position the slide block 3, the piezoelectric actuator 4 is connected with an external voltage controller to realize fine displacement in the vertical direction, so that the nano electrode probe 18 further approaches the surface of a sample to be measured, the capacitance displacement sensor 8 is preliminarily locked and positioned by the locking screw 6 on the capacitance fixer 5, the distance between the positioning screw 11 which is arranged below the capacitance displacement sensor and used for fixing the nano electrode probe 18 and the end face of the capacitance displacement sensor 8 can be further adjusted by rotating the distance adjusting ring 7, thereby the optimal use performance is achieved, the excitation piezoelectric ceramic ring 9 is connected with an external signal generator to realize that the nano electrode probe 18 approaches the surface of the sample to be measured more accurately and safely in a vibration mode, the flexible hinge 12 clamped and fixed between the upper fixing ring 10 and the lower fixing ring 13 is used for bearing and fixing the positioning screw 11 of the nano-electrode probe 18, and the flexible hinge 12 can enable the nano-electrode probe 18 to vibrate better when the excitation piezoelectric ceramic ring 9 works.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.