CN112530784B

CN112530784B - Grid electrode and manufacturing method thereof

Info

Publication number: CN112530784B
Application number: CN202011425794.8A
Authority: CN
Inventors: 齐飞; 周忠岳
Original assignee: Shanghai Jiao Tong University
Current assignee: Shanghai Jiao Tong University
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2022-01-28
Anticipated expiration: 2040-12-09
Also published as: CN112530784A

Abstract

The invention relates to a method for manufacturing grid electrodes and grid electrodes. The manufacturing method first winds metal wires on auxiliary tooling to form grids, and then fixes the grids on grid frames. The complexity of attaching the grid to the grid frame improves the unevenness and unevenness of the distance between the grid wires caused by directly wrapping the grid on the grid frame with slits in the prior invention.

Description

Grid electrode and manufacturing method thereof

Technical Field

The invention relates to the technical field of mass spectrometry, in particular to a grid electrode and a manufacturing method thereof.

Background

Mass spectrometry is an important analysis method in the analysis field, and plays an important role in the fields of medicine, energy, chemical industry, life science and the like. Among the numerous analytical methods, mass spectrometry is known as an analytical method having both high specificity and high sensitivity. The time-of-flight mass spectrometer has been widely focused and applied because of its advantages of large detectable molecular weight range, high scanning speed, simple instrument structure, etc. The flight time mass spectrum is developed into an ion flight mode of secondary acceleration and secondary reflection from the initial linear structure. The introduction of the ion reflector greatly improves the resolution of the time-of-flight mass spectrum, wherein the mesh reflector can effectively isolate the penetration of electric fields in different electric field areas by introducing the grid electrodes, which is beneficial to realizing the uniformity of the electric field of the mass spectrum and further improves the high resolution of the mass spectrum.

At present, an important metal grid in the grid electrode is formed by a plurality of metal wires which are arranged in parallel, the distance between the metal wires is not more than 1 mm, the diameter of the metal wires is generally 10-100 micrometers, so that the metal grid is very easy to damage in the process of adhering the metal grid to the central through hole of the electrode plate, and the grid electrode is unqualified due to loose adhesion of the metal grid. For this reason, some solutions are proposed in the prior art, such as CN107768229B, which proposes a method of directly winding a metal wire around a grid frame, but this method may form a warp at the edge of the metal wire and the grid frame, which affects the flatness of the metal grid, and further affects the resolution of mass spectrometry. Therefore, the grid electrode for high-resolution time-of-flight mass spectrometer and the preparation method thereof still need to be improved.

Disclosure of Invention

The invention aims to provide a method for manufacturing a grid electrode, which aims to solve the problems that a metal grid is easy to damage and the flatness of the metal grid is poor in the conventional grid electrode manufacturing process.

The specific scheme is as follows:

a method for manufacturing a grid electrode, wherein the grid electrode is provided with a grid frame, and the grid frame is provided with grid meshes, the method comprises the following steps:

s1, preparing an auxiliary tool, the grid frame and metal wires, winding the metal wires on the auxiliary tool to form a grid, and enabling the area covered by the grid to be fully paved with grid meshes;

s2, fixing the grid mesh on a grid mesh frame, and enabling the grid mesh to cover the grid mesh holes;

and S3, cutting off the metal wires to disconnect the metal wires positioned on the grid frame from the auxiliary tool.

In one embodiment, the auxiliary tool has a plurality of parallel slits, and the wire passes through the slits and is wound around two auxiliary tools arranged opposite to each other to form a grid arranged in parallel.

In one embodiment, the distance between two adjacent slits on the auxiliary tool defines the distance between two adjacent parallel wires in the grid.

In one embodiment, the auxiliary tool comprises a first tool and a second tool, the first tool comprises a first base and a plurality of first rib plates located on the top of the first base, the first rib plates are arranged in parallel, and a first slit with a first width is defined by two adjacent first rib plates; the second tool comprises a second base and a plurality of second ribbed plates positioned on the top of the second base, the second ribbed plates are arranged in parallel, and a second slit with a second width is defined by two adjacent second ribbed plates; the first base and the second base are fixedly assembled with each other, and the first rib plate and the second rib plate are mutually inserted into the corresponding second slit and the first slit, so that the slit is defined.

In one embodiment, the distance between the two auxiliary tools arranged in opposite directions is 1.3 to 1.5 times the length or the outer diameter of the grid frame.

In one embodiment, the method further comprises providing at least one bead and securing the grid to the grid frame by the at least one bead.

In one embodiment, the grid mesh is rectangular, and the grid mesh is fixed on two outer sides of the length direction of the grid mesh by two strip-shaped pressing strips.

In one embodiment, the grid mesh is circular and the grid mesh is secured to the outside of the grid mesh by a circumferential bead.

In one embodiment, there is the step of deburring the grid on the grid frame after cutting the wire.

The invention also provides a grid electrode prepared by the manufacturing method.

Compared with the prior art, the manufacturing method of the grid electrode provided by the invention has the following advantages: the manufacturing method of the grid electrode provided by the invention firstly winds the metal wires on the auxiliary tool to form the grid nets arranged in parallel, and then the grid nets arranged in parallel are fixed on the grid frame.

Drawings

Fig. 1 shows a schematic diagram of a grid electrode fabrication process.

Fig. 2 shows a schematic view of the auxiliary tool.

Fig. 3 shows a schematic view of the auxiliary tool after separation.

Fig. 4 shows a front view of the auxiliary tool.

Fig. 5 shows an enlarged view at a in fig. 4.

Fig. 6 shows a schematic view of a rectangular grid frame.

Fig. 7 shows a schematic view of a rectangular grid electrode.

Fig. 8 shows a schematic view of a circular grid electrode.

Symbolic illustrations of the figures of the specification:

1. auxiliary tools; 10. a slit; 11. a first tool; 12. a second tool; 110. a first base; 111. a first rib plate; 112. a first slit; 120. a second base; 121. a second rib plate; 122. a second slit;

2. a grid frame; 20. grid mesh holes;

3. a metal wire; 30. a metal grid;

4. and (7) pressing strips.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Example 1

The embodiment provides a manufacturing method of a grid electrode, and referring to fig. 1-2, the manufacturing method includes the following steps:

s1, providing two auxiliary tools 1 and a grid frame 2 which are oppositely arranged, wherein a grid mesh hole 20 is formed in the grid frame 2; the distance between the two auxiliary tools 1 is larger than the length (rectangular grid frame) or the outer diameter (circular grid frame) of the grid frame 2, so that the grid frame 2 can be arranged between the two auxiliary tools 1; generally speaking, the distance between the two auxiliary tools 1 is 1.3 to 1.5 times the length (rectangular grid frame) or the outer diameter (circular grid frame) of the grid frame 2, so that the grid frame 2 can be easily placed between the two auxiliary tools 1, the cutting of the metal wire 3 at the back is facilitated, and the loss of the metal wire can be reduced. The two auxiliary tools 1 are provided with a plurality of parallel gaps 10, and the distance between two adjacent gaps 10 defines the distance between two adjacent parallel metal wires in the metal grid mesh.

And S2, fixing one end of the metal wire 3 on an auxiliary tool 1, wherein the metal wire 3 is reliably fixed on the auxiliary tool to prevent the metal wire 3 from loosening when the subsequent steps are carried out. The specific fixing mode can be any means which can realize reliable fixing by adopting binding, bonding, pressing and the like. The metal wire 3 passes through a gap 10 of one auxiliary tool 1 from the fixed end of the metal wire, then horizontally passes through a corresponding gap 10 of the other auxiliary tool 1, and then the metal wire 3 is wound back to the auxiliary tool 1 which just passes through, so that the metal wire 3 passes through the adjacent gap of the just passing gap, and two parallel winding operations are kept to be completed, and the operation is repeated until the area covered by the metal wire can be completely paved in the grid mesh holes 20 in the grid frame 2.

And S3, pressing the metal wire 3 on the grid frame 2 by adopting a fixing piece, and finally fixing the metal wire 3 on the grid frame 2. The fixing part in the embodiment is a pressing strip 4, fixing holes which are arranged corresponding to the reserved holes in the grid frame 2 are formed in the pressing strip 4, the fixing holes are aligned with the reserved holes, and the pressing strip is fixed on the grid frame through screws and nuts. It should be understood that this is only one preferred embodiment and is not intended to be limiting, and that other attachment methods may be used, such as direct bonding of the bead to the grid frame with a low volatility adhesive.

And S4, cutting off the metal wires along the outer edge of the grid frame or the batten, and removing burrs of the grid on the grid frame to complete the manufacture of the grid electrode.

According to the manufacturing method of the grid electrode, the metal wires are wound on the auxiliary tool to form the grid, and then the grid is fixed on the grid frame, so that the complexity of attaching the grid to the electrode plate is reduced, the phenomenon that the distance between the grid wires is uneven and uneven due to the fact that the grid is directly wound on the slotted grid frame in the prior art is improved, and the grid electrode manufactured through the manufacturing method provided by the embodiment has the advantages of being low in cost, simple to manufacture, high in precision, high in flatness and the like.

In the present embodiment, referring to fig. 3 to 5, each auxiliary tool 1 includes a first tool 11 and a second tool 12, in which the first tool 11 includes a first base 110 and a plurality of first ribs 111 located on the top of the first base 110, the plurality of first ribs 111 are arranged in parallel, and two adjacent first ribs 111 define a first slit 112 with a first width.

The second fixture 12 includes a second base 120 and a plurality of second ribs 121 located on the top of the second base 120, the plurality of second ribs 121 are arranged in parallel, and two adjacent second ribs 121 define a second slit 122 having a second width.

The first base 110 and the second base 120 are fixedly assembled with each other, and the first rib 111 and the second rib 121 are inserted into the corresponding second slit 122 and the first slit 112, so as to define the gap 10.

The purpose of this is: on the first hand, the wide seam which is high in precision and easy to process is processed firstly, and then the seam which is wide in the first tool and the second tool is matched, so that the thin seam which is difficult to process by wire cutting can be manufactured, and the processing difficulty and the processing economy of the wire cutting can be reduced. In a second aspect, the wires are positionally fixed by the slits, the closer the width of the slits is to the diameter of the wires, the smaller the amount of play of the wires in the slits, which can make the spacing between the wires of the entire grid more uniform. In a third aspect, the width of the slit can be adjusted by adjusting the assembling position between the first tool and the second tool, so that the auxiliary tool 1 can be applied to wires with different diameters.

Example 2

The embodiment provides a grid electrode manufactured by the manufacturing method provided in embodiment 1, and the grid electrode includes a grid frame 2 having grid holes 20, a metal grid 30 formed by a plurality of metal wires 3 arranged in parallel, and a bead 4 for fixing the metal grid 30 on the grid frame 2, wherein the area covered by the metal wires of the metal grid 30 completely covers the grid holes 20 in the middle of the grid frame 2, and the metal wires 3 outside the grid holes 20 are fixed on the grid frame 2 by the bead 4.

Wherein, the grid frame 2 is generally a plate structure with grid meshes 20, the bead 4 is also generally a flat strip plate structure, and because the outer diameter of the metal wire 3 is generally very small (generally 10-100 microns), the surface of the grid frame 2 for fixing the metal wire 3 is a smooth plane, and the surface of the bead 4 contacting with the metal wire 3 is also a smooth plane, so that the bead 4 can stably fix the metal wire 3 on the grid frame 2. The fixing of the pressing strip can adopt bolts, nuts, clamps or directly use low volatility glue to bond the pressing strip on the grid frame.

Referring to fig. 7 and 8, in which fig. 7 is a rectangular grid frame 2, the pressing bars 4 are bar-shaped structures, and are respectively located at two outer sides of the grid holes 20 in the length direction to press the metal grid 30, so that the metal grid 30 is fixed on the grid frame 2; and the wire 3 is cut along the edge of the grid frame 2.

Fig. 8 shows a circular grid frame 2, and the pressing bars 4 are circular ring structures, which are respectively located at the outer sides of the grid holes 20 to press the metal grid 30, so that the metal grid 30 is fixed on the grid frame 2; and the wire 3 is cut along the outer edge of the bead 4.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. a preparation method of a grid electrode, the grid electrode has a grid frame, and the grid frame is provided with a grid hole, is characterized in that, comprises the following steps:

S1. Prepare auxiliary tooling, the grid frame and metal wire, wind the metal wire on the auxiliary tooling to form a grid, and make the area covered by the grid covered with the grid holes; wherein, The auxiliary tooling is provided with a plurality of slits arranged in parallel, and the metal wire passes through the slits and is wound on two auxiliary toolings arranged opposite to each other to form a grid arranged in parallel; the auxiliary tooling includes a first tooling and a second tooling. Two tooling, the first tooling includes a first base and a plurality of first ribs on the top of the first base, and the plurality of first ribs are arranged in parallel, and two adjacent ones the first rib defines a first slit having a first width; the second tool includes a second base and a plurality of second ribs on top of the second base, a plurality of the The second ribs are arranged in parallel, and two adjacent second ribs define a second slit with a second width; the first base and the second base are fixedly assembled with each other, and the first The ribs and the second ribs are inserted into the corresponding second slits and the first slits, thereby defining the slits;

S2, fixing the grid to the grid frame, and making the grid cover the grid holes;

S3. Cut the wire to disconnect the wire located on the grid frame from the auxiliary tool.

2 . The manufacturing method according to claim 1 , wherein the distance between two adjacent slits on the auxiliary tooling defines the distance between two adjacent parallel metal wires in the grid. 3 .

3 . The manufacturing method according to claim 1 , wherein the distance between the auxiliary toolings arranged opposite to each other is 1.3 to 1.5 times the length or outer diameter of the grid frame. 4 .

4 . The manufacturing method according to claim 1 , wherein the manufacturing method further comprises providing at least one bead, and the grid is fixed on the grid frame by the at least one bead. 5 .

5 . The manufacturing method according to claim 4 , wherein the grid hole is rectangular, and the grid is fixed on both outer sides of the grid hole in the length direction by two-shaped beading bars. 6 .

6 . The manufacturing method according to claim 4 , wherein the grid hole is circular, and the grid is fixed on the outer side of the grid hole by an annular bead. 7 .

7 . The manufacturing method according to claim 1 , wherein after cutting the metal wire, there is also a step of removing burrs on the grid on the grid frame. 8 .

8 . A grid electrode, characterized in that: the grid electrode is made by the manufacturing method according to any one of claims 1 to 7 .