Positioning device for preparing an ion trap needle electrode

Abstract

The present invention discloses a positioning device for preparing an ion trap needle-shaped electrode, comprising: a shielding barrel, a positioning rod and a needle electrode support plate. Wherein, one end of the shielding barrel opens downward and is immersed in a solution, and the other end forms an end face upward. The end face has a first through hole and a second through hole, and a metal rod for preparing the ion trap needle-shaped electrode passes through the first through hole and enters the shielding barrel; the positioning rod passes through the second through hole and enters the shielding barrel, and is fixed in the second through hole by a fastener; the needle electrode support plate is vertically fixed at the lower end of the positioning rod. When the needle electrode support plate is in vertical contact with the lower end of the metal rod, the depth of the metal rod immersed in the solution via the first through hole is limited to the depth of the positioning rod immersed in the solution via the second through hole. The present invention can accurately determine the depth of the metal rod immersed in the solution during the preparation of the ion trap needle-shaped electrode. In addition, it effectively avoids the disturbance to the preparation process caused by the bubbles generated by the reaction between the metal rod and the solution.

Description

Technical Field

[0001] The present invention relates to the technical field of quantum computing, in particular to the technical field of ion trap quantum computers, and particularly to a positioning device for preparing ion trap needle electrodes. Background Art

[0002] An ion trap is a device that uses an electric or magnetic field to capture and confine ions (i.e., charged atoms or molecules) within a certain range, and can be used to implement a quantum computer. There are many types of ion traps. Among them, the electric field in a needle electrode ion trap or a quadrupole ion trap can be applied to ions through a needle electrode. Therefore, as a device that directly acts on ions in an ion trap, an ion trap quantum computer has quite high requirements for the preparation accuracy of the length and tip structure of the needle electrode (abbreviated as needle pole), because only a needle electrode with high preparation accuracy can better meet the working requirements of the ion trap quantum computer. Summary of the Invention

[0003] To solve the above technical problems, the present invention proposes a positioning device for preparing an ion trap needle electrode. By using the positioning device proposed by the present invention, the depth at which a metal rod penetrates into a solution can be accurately determined during the preparation of the ion trap needle electrode. In addition, it effectively avoids the disturbance to the preparation process caused by bubbles generated by the reaction between the metal rod and the solution.

[0004] An embodiment of the present invention provides a positioning device for preparing an ion trap needle electrode, including: a shielding barrel, a positioning rod, and a needle electrode support plate. One end of the shielding barrel opens downward and penetrates into the solution, and the other end of the shielding barrel forms an end face upward. The end face has a first through hole and a second through hole, and a metal rod for preparing the ion trap needle electrode penetrates through the first through hole and enters the shielding barrel; the positioning rod penetrates through the second through hole and enters the shielding barrel, and is fixed in the second through hole by a fastener; the needle electrode support plate is vertically fixed at the lower end of the positioning rod. When the needle electrode support plate is in vertical contact with the lower end of the metal rod, the depth at which the metal rod penetrates into the solution via the first through hole is limited to the depth at which the positioning rod penetrates into the solution via the second through hole.

[0005] Optionally, scale marks for marking the depth at which the positioning rod is inserted into the shielding barrel are provided on the positioning rod along the axial direction.

[0006] Optionally, an annular convex column is provided on the needle electrode support plate. The annular convex column is located directly below the first through hole on the end face, and the annular convex column is used to correct the verticality of the metal rod.

[0007] Optionally, the inner diameter of the annular convex column gradually decreases from top to bottom along the axial direction of the annular convex column.

[0008] Optionally, the needle pole support plate has a blind hole, and a line connecting the center of the blind hole and the center of the first through hole on the end surface is vertically downward.

[0009] Optionally, a needle electrode collecting bucket is provided on the needle electrode support plate, and the position of the needle electrode collecting bucket corresponds to the position of the first through hole. When the positioning device is immersed in the solution, the needle electrode collecting bucket is used to receive part of the metal rod that is broken due to corrosion by the solution and falls into the needle electrode collecting bucket as a needle-shaped electrode for the ion trap.

[0010] Optionally, a drainage through hole is provided on the side and / or bottom of the needle electrode collecting barrel, and when the positioning device is removed from the solution, the drainage through hole is used to discharge the solution remaining in the needle electrode collecting barrel.

[0011] Optionally, the first through hole is located in a central area of the end surface, and the second through hole is located in an edge area of the end surface.

[0012] Optionally, the fastening mechanism includes an annular externally threaded column and a positioning nut arranged on the end face, the annular externally threaded column is arranged around the edge of the second through hole, and the positioning nut is sleeved on the annular externally threaded column. When the positioning nut is tightened on the annular externally threaded column, the positioning rod is clamped by the annular externally threaded column to be fixed in the second through hole.

[0013] Optionally, a plurality of solution through holes are provided on the needle electrode support plate, and when the positioning device moves up and down in the solution, the solution through holes are used to allow the solution to pass through the solution through holes.

[0014] Optionally, the metal rod is connected to the positive electrode of the power supply, the solution is connected to the positive electrode of the power supply, and the solution contains sodium hydroxide.

[0015] The shielding barrel designed in the embodiment of the present invention is inverted for use in the solution, and the metal rod is in the shielding barrel. Therefore, the shielding barrel can shield a portion of the foam generated during the electrochemical reaction, eliminate the interference of the foam on the corrosion process of the rod, make the shape of the prepared needle electrode more uniform, and improve the preparation accuracy of the needle electrode; and, the end of the positioning rod designed in the embodiment of the present invention is equipped with a needle pole support plate, and by adjusting the depth or height of the needle pole support plate in the shielding barrel, the depth or height of the rod in the shielding barrel can be accurately controlled, so that the length of the prepared needle electrode meets the requirements; in addition, by arranging annular bosses, needle pole collecting barrels and other mechanisms on the needle pole support plate, the entire process of preparing the needle pole can be made easier to operate, and the operation accuracy is high, which can greatly reduce the burden of equipment adjustment on the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1The schematic diagram showing the process of preparing the needle-shaped electrode by the electrochemical corrosion method is shown;

[0018] Figure 2 The schematic structural diagram of the positioning device for preparing the ion trap needle-shaped electrode according to the embodiment of the present invention is shown;

[0019] Figure 3 is Figure 2 The longitudinal sectional view of the shown structure;

[0020] Figure 4 The schematic structural diagram of the positioning rod and the needle electrode support plate according to the embodiment of the present invention is shown;

[0021] Figure 5 is Figure 4 The partial enlarged structural diagram of the needle electrode collection barrel and the annular convex column at position A in the shown structure;

[0022] Figure 6 The top view schematic diagram of another needle electrode support plate according to the embodiment of the present invention is shown;

[0023] Figure 7 The schematic structural diagram of a needle-shaped electrode preparation device according to the embodiment of the present invention is shown;

[0024] Figure 8 is Figure 7 The longitudinal sectional view of the shown structure;

[0025] Figure 9 is Figure 8 The schematic diagram of the structure at position B in the shown structure;

[0026] Figure 10 The schematic diagram showing the depth relationship of multiple structures of the needle-shaped electrode preparation device according to the embodiment of the present invention is shown. Detailed implementation manners

[0027] To make the objectives, 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 are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the following detailed description, reference is made to the various specification drawings that form part of the present invention and illustrate specific embodiments of the present invention. In the drawings, like reference numerals generally describe substantially similar components in different figures. The specific embodiments of the present invention are described in sufficient detail below so that those of ordinary skill in the relevant art and technology can implement the technical solutions of the present invention. It should be understood that other embodiments may also be utilized or structural, logical, or electrical changes may be made to the embodiments of the present invention.

[0029] Figure 1 A schematic diagram showing the process of fabricating a needle-shaped electrode using the electrochemical corrosion method is shown. Refer to Figure 1 , first, insert the tungsten metal rod 101 into the sodium hydroxide solution 102. The rod 101 serves as the anode and is connected to the positive electrode of the constant voltage DC power supply 103; use the conductive body graphite 104 as the cathode and connect it to the negative electrode of the constant voltage DC power supply 103. Then, turn on the constant voltage DC power supply 103 to form an electrochemical corrosion circuit. The rod 101 reacts chemically with the sodium hydroxide solution 102, and the rod 101 dissolves. Under the action of the surface tension of the solution, a meniscus 105 is generated at the intersection of the rod 101 and the liquid surface. Under the dual action of gravity and capillary force, the corrosion rate at the intersection 106 of the rod 101 and the liquid surface is the fastest, forming a "necking effect". As an example, the chemical reaction equation for the process of fabricating the needle-shaped electrode is as follows:

[0030] Cathode: 6H2O + 6e - →3H2(g) + 6OH - ;

[0031] Anode: W(s) + 8OH - →WO4 2- + 4H2O + 6e - .

[0032] As the corrosion continues, the rod 101 will break at the neck 107, and both the upper and lower parts of the rod 101 after breaking can form needle-shaped electrodes with needle tips.

[0033] In order to precisely control the rod during the preparation process, an embodiment of the present invention provides a positioning device for preparing an ion trap needle-shaped electrode. The positioning device includes: a shielding barrel, a positioning rod, and a needle electrode support plate. One end of the shielding barrel opens downward and is immersed in the solution. The other end of the shielding barrel forms an end face upward, and the end face has a first through hole and a second through hole. The rod for preparing the needle-shaped electrode passes through the first through hole and enters the shielding barrel; the positioning rod passes through the second through hole and enters the shielding barrel, and is fixed in the second through hole by a fastener (such as, but not limited to, a positioning nut, etc.); the needle electrode support plate is vertically fixed at the lower end of the positioning rod. When the needle electrode support plate is in vertical contact with the lower end of the metal rod, the depth of the metal rod immersed in the solution via the first through hole is limited to the depth of the positioning rod immersed in the solution via the second through hole.

[0034] Through the cooperation among the shielding barrel, the positioning rod, and the needle electrode support plate, the positioning device according to the embodiment of the present invention can precisely control the immersion height of the rod in the shielding barrel. When in use, the opening of the shielding barrel faces downward, that is, it is inverted in the solution. By adjusting the height of the positioning rod on the shielding barrel, the height of the needle electrode support plate at the lower end of the positioning rod can be adjusted. After the rod is vertically arranged in the shielding barrel and contacts the needle electrode support plate, its height is limited, so that the height of the rod immersed in the solution is precisely controlled, and thus a needle-shaped electrode meeting the requirements can be obtained after the reaction ends. The positioning device according to the embodiment of the present invention is ingeniously designed, flexibly adjustable, and convenient to operate, and can meet the high-precision preparation requirements of the ion trap needle-shaped electrode.

[0035] In some embodiments of the present invention, optionally, scale marks for marking the depth of insertion of the positioning rod into the shielding barrel are provided along the axial direction on the positioning rod.

[0036] By providing scale marks on the positioning rod in the embodiment of the present invention, the current insertion depth of the positioning rod can be quickly read, and the position of the positioning rod can be quickly adjusted to make the insertion depth of the positioning rod meet the requirements. The material of the positioning rod can be made of a corrosion-resistant material, which is beneficial to the long-term non-detachment of the scale marks.

[0037] In some embodiments of the present invention, optionally, an annular convex column is provided on the needle electrode support plate. The annular convex column is located directly below the first through hole on the end face, and the annular convex column is used to correct the verticality of the metal rod.

[0038] Specifically, the annular convex column is a hollow annular shell with a certain height, and the annular convex column is located directly below the first through hole. Then, when installing the metal bar, the metal bar passes through the first through hole and extends into the shielding barrel. The metal bar is moved downward. After the lower end of the metal bar reaches the position of the annular convex column, the lower end of the metal bar is placed into the annular convex column. In this way, the axis of the metal bar can be perpendicular to the downward direction, that is, the metal bar points in the vertical direction, achieving the purpose of perpendicularity calibration. When the metal bar is immersed in the solution, the metal bar can be perpendicular to the liquid surface of the solution. In this way, the prepared needle-shaped electrode is more symmetrical, and the preparation accuracy of the needle-shaped electrode can be improved, especially the accuracy of the tip of the needle-shaped electrode can be improved.

[0039] Among them, the perpendicularity refers to the perpendicularity of the metal bar relative to the liquid surface of the solution. The perpendicularity affects the shape of the corrosion fracture of the metal bar. When the metal bar is perpendicular to the liquid surface of the solution, the shape of the corrosion fracture can be uniform and symmetrical.

[0040] In some embodiments of the present invention, optionally, the inner diameter of the annular convex column gradually decreases from top to bottom along the axial direction of the annular convex column, so that metal bars with different diameters can be placed in the central position of the annular convex column, and the process of perpendicularity calibration can be completed, making the positioning device applicable to the perpendicularity calibration of bars with various sizes.

[0041] In some embodiments of the present invention, optionally, the needle electrode support plate has a blind hole, and the connection line between the center of the blind hole and the center of the first through hole on the end face of the shielding barrel is vertically downward.

[0042] Different from the design of the aforementioned annular convex column, the embodiments of the present invention can also use the blind hole to achieve the perpendicularity calibration of the bar. Specifically, the connection line between the center of the blind hole and the center of the first through hole on the end face of the shielding barrel is vertically downward, that is, the central axis of the blind hole coincides with the central axis of the first through hole, or in other words, the blind hole is located directly below the first through hole. The main difference from the annular convex column is that the blind hole is a sunken hole on the needle electrode support plate (instead of an upward protruding annular column). During perpendicularity alignment, the lower end of the bar is aligned with the blind hole and slightly pressed down, and the bar can be made to be vertically downward as a whole, completing the perpendicularity calibration.

[0043] In some embodiments of the present invention, optionally, a needle electrode collection barrel is provided on the needle electrode support plate, and the position of the needle electrode collection barrel corresponds to the position of the first through hole. When the positioning device is immersed in the solution, the needle electrode collection barrel is used to receive the part of the metal bar that is broken due to being corroded by the solution and falls into the needle electrode collection barrel as the needle-shaped electrode for the ion trap.

[0044] As an example, the needle electrode collecting barrel is a barrel-shaped structure and should have a certain height. The needle electrode collecting barrel is set on the needle electrode supporting plate, and can receive the needle-shaped electrodes that fall after the rod is broken due to corrosion by the solution. In this way, after the needle electrode is prepared, by moving the shielding barrel upward, the needle electrode collecting barrel follows the shielding barrel and the needle electrode supporting plate to move up and is quickly removed from the solution, so that the prepared needle electrode can be quickly removed and the prepared needle electrode can be prevented from being in contact with the solution for a long time, which may affect the accuracy of the needle electrode.

[0045] In some embodiments of the present invention, a drainage hole is optionally provided on the side and / or bottom of the needle electrode collection barrel, and when the positioning device is removed from the solution, the drainage hole is used to discharge the solution remaining in the needle electrode collection barrel. A drainage hole is also provided on the side of the needle electrode collection barrel, and the drainage hole is connected to the bottom of the needle electrode collection barrel, so that when the shielding barrel leaves the solution, the solution entering the needle electrode collection barrel can be quickly drained, preventing the needle electrode dropped into the needle electrode collection barrel from continuing to contact with the solution, corroding the needle electrode, and affecting the accuracy and shape of the needle electrode tip.

[0046] In some embodiments of the present invention, optionally, the first through hole is located in the central area of the end face. The metal rod is installed in the first through hole, and the metal rod is located in the central area to make the circumferential environment uniform during the corrosion process, which is conducive to improving the preparation accuracy. In addition, optionally, the second through hole is located in the edge area of the end face. A positioning rod is installed in the second through hole, and the layout of various components is reasonable and easy to operate.

[0047] In some embodiments of the present invention, optionally, the fastening mechanism includes an annular external thread column and a positioning nut disposed on the end surface of the shield barrel, the annular external thread column is disposed around the edge of the second through hole, the positioning nut is sleeved on the annular external thread column, and when the positioning nut tightens the annular external thread column, the positioning rod is held tightly by the annular external thread column to be fixed in the second through hole. As an example, a longitudinal opening may be provided on the outer side of the annular thread column, and when the positioning nut is tightened, the annular thread column can be tightened so that the annular thread column holds the positioning column tightly and fixes the positioning column at the current height.

[0048] For example, before starting preparation, the vertical depth of the metal bar in the shield barrel can be determined, and the positioning nut on the second through hole can be loosened to adjust the positioning rod (the scale can be marked on the positioning rod) so that the distance from the needle pole support plate at the lower end of the positioning rod to the end face of the shield barrel is consistent with the vertical depth, and the positioning nut is tightened. Then, the metal bar can be inserted into the first through hole, and after the lower end of the metal bar reaches the needle pole support plate, the metal bar is fixed in the first through hole. In the above manner, the vertical depth of the bar can be precisely controlled, which is conducive to improving the accuracy of needle pole preparation.

[0049] In some embodiments of the present invention, optionally, a plurality of solution through-holes are formed in the needle electrode support plate. When the positioning device moves up and down in the solution, the solution through-holes are used to allow the solution to pass through. When the needle electrode support plate moves in the solution, the solution facing the needle electrode support plate can pass through the solution through-holes, so that the water pressure borne by the needle electrode support plate can be released through the solution through-holes. In this way, the movement of the needle electrode support plate in the solution will become smoother, reducing the disturbance of the needle electrode support plate to the solution and improving the stability of the reaction process.

[0050] In some embodiments of the present invention, optionally, the metal bar is electrically connected to the positive electrode of the power supply, and the solution is electrically connected to the positive electrode of the power supply. The solution contains sodium hydroxide.

[0051] In some embodiments of the present invention, optionally, a cathode ring can be placed in the solution. The inner diameter of the cathode ring is larger than the outer diameter of the shielding barrel. The cathode ring is connected to the negative electrode of the power supply through a cathode terminal.

[0052] When preparing the needle-shaped electrode, the shielding barrel is placed in the solution surrounded by the cathode ring, and the hydroxide ions will be evenly distributed along the circumferential direction of the shielding barrel. In this way, the corrosion rates around the metal bar located in the shielding barrel will be consistent, and the prepared needle-shaped electrode will be more symmetrical along the circumferential direction.

[0053] The above describes various implementation manners of the positioning device for preparing the ion trap needle-shaped electrode in the embodiments of the present invention through multiple embodiments. The following describes the structure and operation process of the positioning device in the embodiments of the present invention through multiple specific examples.

[0054] As an example, Figure 2 The structural schematic diagram of the positioning device for preparing the ion trap needle-shaped electrode in the embodiment of the present invention is shown. Figure 3 is Figure 2 The longitudinal sectional view of the shown structure. Combining Figure 2 and Figure 3As shown in the figure, the positioning device 200 for preparing the ion trap needle-shaped electrode includes: a shielding barrel 201, a positioning rod 202, and a needle electrode support plate 203. Among them, the shielding barrel 201 is a hollow cylinder. One end 2011 of the shielding barrel 201 opens downward, and the other end of the shielding barrel 201 forms an end face 2012 upward. The end face 2012 has a first through hole 2013 and a second through hole 2014. The metal bar 101 for preparing the ion trap needle-shaped electrode passes through the first through hole 2013 and enters the shielding barrel 201. The positioning rod 202 is a rod-shaped structure. The positioning rod 202 passes through the second through hole 2014 and enters the shielding barrel 201, and can be adjusted and fixed to a specified height by a positioning nut 209. The needle electrode support plate 203 is a plate-shaped structure. The needle electrode support plate 203 is vertically fixed to the lower end of the positioning rod 202, and can move up and down in the shielding barrel 201 driven by the positioning rod 202. When the needle electrode support plate 203 is in vertical contact with the lower end of the metal bar 101, the insertion depth of the metal bar 101 into the shielding barrel 201 is the same as the insertion depth of the positioning rod 202 into the shielding barrel 201. In addition, the area of the needle electrode support plate 203 matches the cross-sectional area of the shielding barrel 201. In Figure 2 the example, the shielding barrel 201 is a cylinder, the needle electrode support plate 203 is a circular plate, and the diameter of the needle electrode support plate 203 is smaller than the diameter of the shielding barrel 201. The needle electrode support plate 203 can move up and down along the axial direction of the shielding barrel 201 to achieve flexible control and adjustment of the immersion depth of the metal bar 101. In addition, the shielding barrel design of the embodiment of the present invention can shield the bubbles generated by the cathode when the metal bar 101 reacts with the solution, so as to avoid the disturbance of the liquid near the metal bar by the bubbles, thereby maximizing the stability of the corrosion process of the metal bar and improving the preparation accuracy of the ion trap needle-shaped electrode.

[0055] In order to clearly describe the structure of the needle-shaped support plate, Figure 4 the schematic structural diagram of the positioning rod and the needle electrode support plate of the embodiment of the present invention is shown. Figure 5 is Figure 4 the enlarged partial structural diagram of the needle electrode collection barrel and the annular convex column at A in the shown structure. Figure 6 The top view schematic diagram of another needle electrode support plate of the embodiment of the present invention is shown. Among them, an annular convex column 204 is provided on the upper surface 2031 of the needle electrode support plate 203. The annular convex column 204 is arranged directly below the first through hole 2013. When correcting the verticality of the metal bar 101, the lower end of the metal bar 101 can be inserted into the annular convex column 204. Optionally, the bottom surface of the annular convex column 204 is also the upper surface of the needle electrode support plate 203.

[0056] See Figure 4 and Figure 5, a needle electrode collection barrel 205 is also provided on the upper surface of the needle electrode support plate 203, and the needle electrode collection barrel 205 is located directly below the first through hole 2013. A drainage through hole 2051 is also provided on the side of the needle electrode collection barrel 205, and the drainage through hole 2051 is connected to the bottom surface of the needle electrode collection barrel 205. In some embodiments, optionally, the needle electrode collection barrel 205 and the annular protrusion 204 are both located on the upper surface of the needle electrode support plate 203, and the diameter of the annular protrusion 204 is smaller than the diameter of the needle electrode collection barrel 205.

[0057] See also Figure 4-6 A solution through hole 208 is provided on the needle support plate 203. The shape of the solution through hole 208 can be as follows: Figure 4 The circular hole shown can also be Figure 6 As shown, the arc-shaped hole 2081. Regarding the distribution position of the solution through hole, optionally, the solution through hole 208 is symmetrically distributed or evenly distributed on the needle electrode support plate 203. When the needle electrode support plate 203 moves up and down in the solution, the solution can flow through the solution through hole 208 quickly, and the pressure from the solution on the needle electrode support plate 203 is reduced and more uniform, which can prevent the needle electrode support plate from deflecting and prevent the needle electrode in the needle electrode collection barrel from sliding due to liquid disturbance.

[0058] Continue to see Figure 3 As shown, on the end face 2012, an annular external thread column 2015 is protruded along the axial direction of the shield barrel 201. The annular external thread column 2015 is a hollow column, and the outer side surface has a thread. The through hole in the annular external thread column 2015 is connected with the second through hole 2014. The positioning rod 202 is inserted into the annular external thread column 2015 and the second through hole 2014. The inner wall of the positioning nut 209 has an internal thread. The positioning nut 209 is sleeved on the annular external thread column 2015. The positioning nut 209 is tightened with the annular external thread column 2015, and the positioning rod 202 inserted in the annular external thread column 2015 can be fixed on the annular external thread column 2015, thereby fixing the positioning rod 202 on the end face. On the contrary, if the positioning rod 202 needs to be adjusted up and down along the second through hole 2014, the positioning nut 209 can be loosened for adjustment. Optionally, the annular external thread column 2015 is provided with a longitudinal opening, and when the positioning nut 209 is tightened, the opening of the annular external thread column 2015 converges, so that the annular external thread column 2015 and the positioning rod 202 are tightly embraced to fix the positioning rod 202. For example, when the depth of the positioning rod 202 extending into the shield barrel 201 meets the requirements, the positioning nut 209 can be tightened to limit the positioning rod 202 on the end surface 2012 of the shield barrel 201.

[0059] refer to Figure 2 and Figure 3, the upper end of the positioning rod 202 is provided with an end cap 2021, and a spring 2022 is sleeved on the positioning rod 202. One end of the spring 2022 is connected to the positioning nut 209, and the other end is connected to the end cap 2021. Due to the presence of the spring 2022, even if the positioning nut 209 is not tightened, the positioning rod 202 will not slide down and fall off. In some embodiments of the present invention, the spring 2022 enables the needle electrode support plate 203 to be located near the edge below the opening of the shielding barrel 201 even when the positioning nut 209 is not tightened, and the component structure in the device is compact, facilitating maintenance. Figure 7 A schematic structural diagram of a needle-shaped electrode preparation device according to an embodiment of the present invention is shown. Figure 8 is Figure 7 A longitudinal sectional view of the structure shown. Combining Figure 7 and Figure 8 As shown, the needle-shaped electrode preparation device not only includes a positioning device 200 but also includes structures such as a reaction barrel 207, a cathode ring 211, and a base 221. Among them, the cathode ring 211 is arranged in the solution in the reaction barrel 207. The inner diameter of the cathode ring 211 is larger than the outer diameter of the shielding barrel 201, and the cathode ring 211 is connected to the negative pole of the power supply through a cathode terminal 210. When preparing the needle-shaped electrode, the shielding barrel 201 is inserted into the solution surrounded by the cathode ring 211, so that the hydroxide ions generated by the ionization of water by the cathode ring 211 will be evenly distributed around the rod 101, and the shape of the prepared needle-shaped electrode is more symmetrical.

[0060] Figure 9 is Figure 8 A schematic diagram of the structure at B in the structure shown. Combining Figure 8 and Figure 9As shown, the metal bar 101 is fixed to the end face 2012 of the shielding barrel 201 through the anode assembly. The anode assembly includes: an anode terminal 2061, an anode connection nut 2062, an anode insulating sleeve 2063, and a bar fastening nut 2064. Among them, the anode insulating sleeve 2063 is a hollow cylindrical structure fixed in the first through hole 2013. The anode insulating sleeve 2063 is made of an insulating material. A groove 2065 is formed on the outer side surface of the anode insulating sleeve 2063 along the circumferential direction of the anode insulating sleeve 2063. The width of the groove 2065 along its axial direction matches the axial thickness of the end face of the shielding barrel 201. In this way, the edge of the first through hole 2013 is clamped in the groove 2065, so that the anode insulating sleeve 2063 is fixed on the end face 2012. The anode terminal 2061 is inserted into the anode insulating sleeve 2063. In some embodiments, optionally, the anode terminal 2061 is a hollow cylindrical structure and is threadedly connected to the anode insulating sleeve 2063. In addition, a longitudinal opening is formed on the side surface of the top 2066 of the anode terminal 2061. This opening enables the bar fastening nut 2064 to tighten the top 2066 of the anode terminal 2061 to shrink the diameter of the top 2066, thereby clamping the metal bar 101. The bar fastening nut 2064 is sleeved on the top 2066. The bar 101 passes through the bar fastening nut 2064 and the anode terminal 2061 in sequence and enters the shielding barrel 201. The metal bar 101 with a determined insertion depth is limited on the end face 2012 of the shielding barrel 201 by tightening the top 2066 of the anode terminal 2061 through the bar fastening nut 2064. The anode connection nut 2062 is located between the bar fastening nut 2064 and the anode insulating sleeve 2063 and is sleeved on the anode terminal 2061. When preparing the ion trap needle-shaped electrode, the anode connection nut 2062 is connected to the positive pole of the power supply and conducts electricity to the metal bar 101 through the anode terminal 2061, so that the metal bar 101 inserted into the solution is electrified and undergoes electrochemical corrosion.

[0061] Figure 10 Schematic diagram showing the depth relationship of multiple structures of the needle-shaped electrode preparation device according to an embodiment of the present invention.

[0062] As an example, referring to Figure 10 , the following describes the operation steps for positioning the vertical depth of the metal bar using the positioning device:

[0063] Step 101: According to the depth H at which the metal bar 101 should be inserted into the solution 220, calculate the depth H' at which the metal bar 101 is inserted into the shielding barrel 201, where H' = H+(H1 - H2), H1 is the height from the end face 2012 of the shielding barrel 201 to the base 221, and H2 is the height from the liquid surface of the solution 220 in the reaction barrel 207 to the base 221.

[0064] Step 102: According to the calculated H’, adjust the insertion depth of the positioning rod 202 into the shielding barrel 201, that is, make the insertion depth of the positioning rod 202 equal to H’.

[0065] Step 103: After the adjustment is in place, tighten the positioning nut 209 to fix the positioning rod 202 on the end face 2012 of the shielding barrel.

[0066] Step 104: Insert the metal rod 101 into the shielding barrel 201 along the first through hole. After the bottom end of the metal rod 101 touches the needle electrode support plate 203, the insertion depth of the metal rod 101 is equal to the insertion depth of the positioning rod 202, that is, the insertion depth of the metal rod 101 is equal to H’ at this time, and the rod positioning process is completed.

[0067] In order to prepare needle-shaped electrodes of different lengths, it is necessary to change the insertion depth of the metal rod into the shielding barrel. The positioning device of the present invention can simply and efficiently determine the insertion depth of the metal rod to solve the problem that it is difficult to determine the insertion depth of the metal rod into the solution in the prior art.

[0068] In some embodiments, optionally, the shielding barrel can be a cylindrical barrel, or other shapes such as a square barrel, or an irregular barrel body such as a cylinder with unequal axial diameters, etc., and the positioning device of the embodiments of the present invention can be realized.

[0069] The positioning device for preparing an ion trap needle-shaped electrode proposed in the embodiments of the present invention can determine the insertion depth of the rod into the shielding barrel by using the limiting and calibration functions of the positioning rod and the needle electrode support plate, and can efficiently determine the insertion depth of the rod into the solution, so that the length of the prepared needle-shaped electrode meets the preset requirements. Moreover, by using the shielding function of the shielding barrel, the interference caused by the bubbles generated by the cathode to the anode can be eliminated, making the shape of the prepared needle-shaped electrode more symmetrical. In addition, the design of the needle electrode collection barrel, the annular convex column, etc. makes the needle-shaped electrode prepared by the positioning device have higher precision and better meet the usage requirements of the ion trap.

[0070] The above embodiments are only for explaining the present invention, rather than limiting the present invention. Those of ordinary skill in the relevant technical fields can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the disclosure of the present invention.

Claims

1. A positioning device for preparing an ion trap needle-shaped electrode, characterized in that, Comprising: A shielding barrel, a positioning rod, and a needle electrode support plate, wherein One end of the shielding barrel opens downward and is immersed in the solution, and the other end of the shielding barrel forms an end face upward. The end face has a first through hole and a second through hole, and a metal rod for preparing an ion trap needle electrode passes through the first through hole and enters the shielding barrel; The positioning rod passes through the second through hole and enters the shielding barrel, and is fixed in the second through hole by a fastener; The needle electrode support plate is vertically fixed at the lower end of the positioning rod. When the needle electrode support plate is in vertical contact with the lower end of the metal rod, the depth of the metal rod immersed in the solution via the first through hole is limited to the depth of the positioning rod immersed in the solution via the second through hole.

2. The positioning device according to claim 1, characterized in that, Scale marks for marking the depth of insertion of the positioning rod into the shielding barrel are provided axially on the positioning rod.

3. The positioning device according to claim 1, characterized in that, An annular convex column is provided on the needle electrode support plate. The annular convex column is located directly below the first through hole on the end face, and the annular convex column is used to correct the verticality of the metal rod.

4. The positioning device according to claim 3, wherein The inner diameter of the annular convex column gradually decreases from top to bottom along the axial direction of the annular convex column.

5. The positioning device according to claim 1, wherein A blind hole is provided on the needle electrode support plate, and the connection line between the center of the blind hole and the center of the first through hole on the end face is vertically downward.

6. The positioning device according to claim 1, wherein A needle electrode collection barrel is provided on the needle electrode support plate. The position of the needle electrode collection barrel corresponds to the position of the first through hole. When the positioning device is immersed in the solution, the needle electrode collection barrel is used to receive a part of the metal rod that breaks due to being corroded by the solution and falls into the needle electrode collection barrel as a needle electrode for the ion trap.

7. The positioning device according to claim 6, characterized in that, Drainage through holes are provided on the side and / or bottom surface of the needle electrode collection barrel. When the positioning device is removed from the solution, the drainage through holes are used to drain the solution remaining in the needle electrode collection barrel.

8. The positioning device according to claim 1, characterized in that, The first through hole is located in the central area of the end face, and the second through hole is located in the edge area of the end face.

9. The positioning device according to claim 1, wherein The fastening mechanism includes an annular external threaded column and a positioning nut provided on the end face of the shielding barrel. The annular external threaded column is arranged around the edge of the second through hole, and the positioning nut is sleeved on the annular external threaded column. When the positioning nut tightens the annular external threaded column, the positioning rod is clamped by the annular external threaded column and fixed in the second through hole.

10. The positioning device according to claim 1, wherein A plurality of solution through holes are provided on the needle electrode support plate. When the positioning device moves up and down in the solution, the solution through holes are used to allow the solution to pass through the solution through holes.

11. The positioning device according to claim 10, characterized in that, The metal rod is electrically connected to the positive electrode of the power supply, the solution is electrically connected to the positive electrode of the power supply, and the solution contains sodium hydroxide.

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