A tungsten filament replacement and installation device

Abstract

The present invention relates to the field of electron microscope scanning technology, and discloses a tungsten filament replacement and installation device, wherein the base comprises a fixed sleeve, a limiting piece is arranged on the inner side wall of the fixed sleeve, and a locking assembly is arranged on the outer side wall; the installation assembly comprises a first mounting platform coaxial with the fixed sleeve and arranged at intervals, the first mounting platform defines a mounting cavity in the fixed sleeve, a second mounting platform is convexly arranged on the first mounting platform, the filament pins of the tungsten filament are inserted on the second mounting platform, the filament holder is located in the mounting cavity and covers the first mounting platform and the second mounting platform, the limiting piece can limit the filament holder, and the locking assembly abuts against the filament holder. Compared with the installation method of tungsten filament in the prior art, the present invention has a compact structure, simple operation, and can be easily mastered by an inexperienced person, which effectively improves the replacement and installation speed of the tungsten filament and realizes the rapid installation of the tungsten filament. At the same time, it can ensure the centering effect of the tungsten filament, extend the service life of the tungsten filament, and reduce the cost of experimental detection.

Description

Technical Field

[0001] The invention relates to the technical field of electron microscope scanning, and in particular to a tungsten filament replacement and installation device. Background Art

[0002] At present, many domestic research institutes have carried out research on shale gas reservoirs. It has become an important way to quickly obtain the micron-level or even nano-level pore development characteristics inside the shale gas reservoir through scanning electron microscopy. From the perspective of imaging, the electron beam generated by the tungsten filament gun can fully meet the existing shale gas reservoir pore exploration requirements, but its biggest problem is its service life, which is generally only a few dozen hours. Therefore, electron microscope operators must regularly replace the tungsten filament. After the tungsten filament is replaced, if it is properly installed, that is, the centering is good, a higher image quality can be obtained and the service life of the filament can be relatively extended. There are two commonly used filaments at present. One is a prefabricated tungsten filament, which is directly loaded in the filament holder and has a good centering, but the price is more expensive; the other is called a bare filament, that is, it has not been pre-centered, does not come with a filament holder, and the price is relatively cheap.

[0003] Since prefabricated tungsten filaments are expensive and have high long-term use costs, manually installing bare filaments is a good choice. However, installing bare filaments requires certain skills, which is difficult for operators. It is very easy for the filament tip to deflect, deform, or even damage, resulting in the filament being scrapped, and it takes a lot of time. At the same time, after the bare filament is installed, the manually prefabricated filament needs to be installed in the electron microscope grid cap for centering. Due to personal skills, the centering effect is often not guaranteed, resulting in low image quality, shortened filament life, and increased experimental detection costs. Summary of the invention

[0004] Based on the above problems, the purpose of the present invention is to provide a tungsten filament replacement and installation device, which is simple to operate, can realize the rapid installation of the tungsten filament, ensure the centering effect of the tungsten filament, extend the service life of the tungsten filament, and reduce the experimental detection cost.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A tungsten filament replacement and installation device, comprising:

[0007] The base comprises a fixed sleeve, wherein a limiter is arranged on the inner side wall of the fixed sleeve, and a locking assembly is arranged on the outer side wall;

[0008] The mounting assembly includes a first mounting platform that is coaxial with the fixed sleeve and spaced apart, the first mounting platform defines a mounting cavity in the fixed sleeve, a second mounting platform is protruded on the first mounting platform, the filament pins of the tungsten filament are inserted on the second mounting platform, the filament holder of the tungsten filament is located in the mounting cavity, and the first mounting platform and the second mounting platform are covered, the limiting member can limit the filament holder, and the locking assembly abuts against the filament holder.

[0009] As a preferred embodiment of the tungsten filament replacement and installation device of the present invention, the second mounting platform is located at the center of the first mounting platform, and a filament pin hole is provided on the second mounting platform, and the filament pin is inserted into the filament pin hole.

[0010] As a preferred embodiment of the tungsten filament replacement and installation device of the present invention, the second installation platform includes a rectangular platform and semi-cylinders arranged at both ends of the rectangular platform, the rectangular platform and the semi-cylinders are integrally formed, and two filament pin holes are arranged at intervals along the length direction of the rectangular platform.

[0011] As a preferred embodiment of the tungsten filament replacement and installation device of the present invention, a limiting groove is provided on the filament holder, the limiting member is slidably matched with the limiting groove, a plurality of locking assemblies are arranged at circumferential intervals on the fixed sleeve, and the plurality of locking assemblies press the filament holder against the first mounting platform.

[0012] As a preferred solution of the tungsten filament replacement and installation device of the present invention, each of the locking assemblies includes an abutment rod and a force-applying portion arranged on the abutment rod, and the abutment rod passes through the fixing sleeve and abuts against the filament holder.

[0013] As a preferred solution of the tungsten filament replacement and installation device of the present invention, a threaded hole is radially arranged on the fixing sleeve, and the abutment rod is threadedly connected to the fixing sleeve through the threaded hole.

[0014] As a preferred solution of the tungsten filament replacement and installation device of the present invention, the depth of the installation cavity is smaller than the height of the filament holder, so that the screw hole of the filament holder is located outside the fixing sleeve.

[0015] As a preferred solution of the tungsten filament replacement and installation device of the present invention, the base further includes a bottom plate, and the fixing sleeve is located at the center of the bottom plate.

[0016] As a preferred solution of the tungsten filament replacement and installation device of the present invention, the base and the installation assembly are both made of wear-resistant materials.

[0017] As a preferred embodiment of the tungsten filament replacement and installation device of the present invention, the wear-resistant material includes brass.

[0018] The beneficial effects of the present invention are:

[0019] The tungsten filament replacement and installation device provided by the present invention, when in use, first insert the filament pins of the tungsten filament on the second mounting platform, the chassis of the tungsten filament fits with the second mounting platform, and the tungsten filament is installed in place. Then, the filament holder of the tungsten filament is placed in the installation cavity, and after the filament holder is placed, the first mounting platform and the second mounting platform are just covered. Since an avoidance hole is provided at the top of the filament holder, the tungsten filament needs to extend out of the filament holder through the avoidance hole. Therefore, during the placement of the filament holder, the limiting member can limit the filament holder to prevent the filament holder from damaging the tungsten filament due to misalignment, thereby ensuring the installation quality and centering effect of the tungsten filament. After the filament holder is in place, the locking assembly on the outer wall of the fixed sleeve is abutted against the filament holder to fix the filament holder. Finally, screw the screw into the screw hole of the filament holder, fix the filament holder and the tungsten filament together to complete the replacement of the tungsten filament. Compared with the replacement and installation method of tungsten filament in the prior art, the replacement and installation device of tungsten filament provided by the present invention has a compact structure and simple operation, and can be easily mastered by an inexperienced person, thereby effectively improving the replacement and installation speed of tungsten filament and realizing the rapid installation of tungsten filament. At the same time, it can ensure the centering effect of tungsten filament, extend the service life of tungsten filament, and reduce the experimental detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 is a schematic structural diagram of a tungsten filament replacement and installation device provided by a specific embodiment of the present invention at a first viewing angle;

[0022] Figure 2 is a schematic structural diagram of a tungsten filament replacement and installation device provided by a specific embodiment of the present invention at a second viewing angle;

[0023] Figure 3 It is a schematic diagram of the tungsten filament installation process of the tungsten filament replacement and installation device provided in a specific embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the tungsten filament ... replacement and installation device provided in a specific embodiment of the present invention after the tungsten filament is installed;

[0025] Figure 5 It is a schematic diagram of a filament holder of a tungsten filament replacement and installation device provided in a specific embodiment of the present invention after installation is completed.

[0026] In the figure:

[0027] 1-base; 2-mounting assembly; 3-filament pin; 4-filament holder; 5-tungsten filament; 6-screw hole;

[0028] 11-fixed sleeve; 12-locking assembly; 13-bottom plate;

[0029] 111-limiting member; 121-abutting rod; 122-force applying part;

[0030] 21-first mounting platform; 22-mounting cavity; 23-second mounting platform;

[0031] 231-filament pin hole;

[0032] 41-limiting groove; 42-avoidance hole. DETAILED DESCRIPTION

[0033] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figures 1 to 5As shown, this embodiment provides a tungsten filament replacement and installation device, which can realize the rapid installation of the tungsten filament 5. The tungsten filament replacement and installation device includes a base 1 and a mounting assembly 2.

[0037] Among them, the base 1 includes a fixed sleeve 11, a limiting member 111 is arranged on the inner wall of the fixed sleeve 11, and a locking assembly 12 is arranged on the outer wall; the mounting assembly 2 includes a first mounting platform 21 which is coaxial with the fixed sleeve 11 and spaced apart, the first mounting platform 21 defines a mounting cavity 22 in the fixed sleeve 11, a second mounting platform 23 is protruded on the first mounting platform 21, the filament pin 3 of the tungsten filament 5 is inserted on the second mounting platform 23, the filament holder 4 of the tungsten filament 5 is located in the mounting cavity 22 and is covered by the first mounting platform 21, the limiting member 111 can limit the filament holder 4, and the locking assembly 12 abuts against the filament holder 4.

[0038] The tungsten filament replacement and installation device provided in this embodiment, when in use, first insert the filament pin 3 of the tungsten filament 5 on the second mounting platform 23, the chassis of the tungsten filament 5 fits with the second mounting platform 23, and the tungsten filament 5 is installed in place. Then, the filament holder 4 of the tungsten filament 5 is placed in the installation cavity 22, and after the filament holder 4 is placed, it just covers the first mounting platform 21 and the second mounting platform 23. Since the top of the filament holder 4 is provided with an avoidance hole 42, the tungsten filament 5 needs to extend out of the filament holder 4 through the avoidance hole 42. Therefore, during the placement of the filament holder 4, the limiting member 111 can limit the filament holder 4 to prevent the filament holder 4 from damaging the tungsten filament 5 due to misalignment, thereby ensuring the installation quality and centering effect of the tungsten filament 5. After the filament holder 4 is in place, the locking assembly 12 on the outer wall of the fixing sleeve 11 is abutted against the filament holder 4 to fix the filament holder 4. Finally, screw the screw into the screw hole 6 of the filament holder 4, fix the filament holder 4 and the tungsten filament 5 together, and the replacement of the tungsten filament 5 is completed. Compared with the replacement and installation method of the tungsten filament 5 in the prior art, the tungsten filament replacement and installation device provided in this embodiment has a compact structure and simple operation, and can be easily mastered by an inexperienced person, which effectively improves the replacement and installation speed of the tungsten filament 5 and realizes the rapid installation of the tungsten filament 5. At the same time, it can ensure the centering effect of the tungsten filament 5, extend the service life of the tungsten filament 5, and reduce the experimental detection cost.

[0039] Optionally, the base 1 and the mounting assembly 2 are both made of wear-resistant materials. Further preferably, the wear-resistant material includes brass. Brass is strong and durable, not easy to deform, and avoids deformation or wear of parts due to long-term use, thereby ensuring the installation accuracy and installation quality of the tungsten filament replacement and installation device.

[0040] The tungsten filament replacement and installation device of the present embodiment is small in size, does not occupy space, can be put into a pocket of clothes, and is easy to carry. In addition, the present embodiment adopts CNC machining technology to process the tungsten filament replacement and installation device, and there is no human involvement in the entire machining process, so the operator's human error is eliminated. At the same time, due to the centralized process of the CNC machine tool, the influence of multiple clamping of the workpiece on the machining accuracy is reduced, so the machining accuracy of each component is high, which can reach 0.01mm, meeting the high-precision requirements of the scanning electron microscope equipment itself.

[0041] like Figure 1 and Figure 2 As shown, optionally, the second mounting platform 23 is located at the center of the first mounting platform 21, and a filament pin hole 231 is provided on the second mounting platform 23, and the filament pin 3 is inserted into the filament pin hole 231. The filament pins 3 include two, and both of the two filament pins 3 pass through the chassis of the tungsten filament 5, the upper ends of the two filament pins 3 are connected to the tungsten filament 5, and the lower ends are inserted into the filament pin hole 231 of the second mounting platform 23, and the chassis is in contact with the table surface of the second mounting platform 23.

[0042] In this embodiment, preferably, the second mounting platform 23 includes a rectangular platform and semi-cylinders arranged at both ends of the rectangular platform, the rectangular platform and the semi-cylinders are integrally formed, and two filament pin holes 231 are arranged at intervals along the length direction of the rectangular platform. The two filament pin holes 231 are located on the line connecting the centers of the two semi-cylinders, and the spacing between the two filament pin holes 231 matches the spacing between the two filament pins 3. The shape design of the second mounting platform 23 can prevent it from interfering with the screws of the filament holder 4, and does not affect the screwing in and out of the screws.

[0043] like Figures 3 to 5 As shown, optionally, a limiting groove 41 is provided on the filament holder 4, and the limiting member 111 is slidably matched with the limiting groove 41, and a plurality of locking assemblies 12 are arranged at intervals in the circumferential direction of the fixed sleeve 11, and the plurality of locking assemblies 12 press the filament holder 4 against the first mounting platform 21. Specifically, the limiting member 111 is a limiting pin arranged along the axial direction of the fixed sleeve 11, and correspondingly, the limiting groove 41 extends along the vertical direction of the filament holder 4. One function of the limiting member 111 is that when the filament holder 4 is installed, the limiting member 111 is slidably matched with the limiting groove 41 to guide the filament holder 4, prevent the filament holder 4 from being misplaced, and ensure that the avoidance hole 42 of the filament holder 4 is facing the tungsten filament 5 to avoid damage to the tungsten filament 5. Another function of the limiting member 111 is that after the filament holder 4 is in place, the limiting member 111 is located in the limiting groove 41, and the filament holder 4 cannot move laterally relative to the fixed sleeve 11, which plays a limiting role.

[0044] In addition, the setting of the limiting member 111 and the limiting groove 41 adopts a foolproof design, which can prevent the tungsten filament 5 from being damaged due to the improper placement of the filament holder 4 and the misalignment of the tungsten filament 5 and the avoidance hole 42 of the filament holder 4 when replacing the tungsten filament 5, thereby reducing the risk of incorrect installation of the tungsten filament 5. This design is easy to operate and can achieve accurate matching and positioning of the filament holder 4 and the tungsten filament 5. Even inexperienced experimenters can easily master it, which greatly saves the replacement and installation time of the tungsten filament 5.

[0045] In this embodiment, preferably, two locking assemblies 12 are provided, and the two locking assemblies 12 and the limit member 111 are centrally symmetrically distributed on the fixed sleeve 11. This distribution method enables the filament holder 4 to have three triangular force points, which can ensure the stability of the filament holder 4 and make the tungsten filament 5 more accurately installed.

[0046] like Figure 1 As shown, optionally, each locking assembly 12 includes an abutting rod 121 and a force-applying portion 122 disposed on the abutting rod 121, and the abutting rod 121 passes through the fixing sleeve 11 and abuts against the filament holder 4. After the filament holder 4 is placed in the mounting cavity 22, the force-applying portion 122 applies force so that the abutting rod 121 presses against the filament holder 4, and the stopper 111 and the two locking assemblies 12 work together to fix the filament holder 4.

[0047] Preferably, a threaded hole is radially provided on the fixed sleeve 11, and the abutment rod 121 is threadedly connected to the fixed sleeve 11 through the threaded hole. When fixing the filament holder 4, the abutment rod 121 is screwed through the force-applying portion 122 so that the abutment rod 121 moves radially relative to the fixed sleeve 11 and presses against the filament holder 4. After the filament holder 4 and the tungsten filament 5 are fixed together, the force-applying portion 122 is screwed in the reverse direction so that the abutment rod 121 is away from the filament holder 4, and the installed filament holder 4 and the tungsten filament 5 can be taken out of the installation cavity 22. The installed filament holder 4 and the tungsten filament 5 can be used directly, and the centering effect is good, which can extend the service life of the tungsten filament 5.

[0048] like Figure 2 As shown, optionally, the depth of the mounting cavity 22 is less than the height of the filament holder 4, so that the fixing screw hole 6 of the filament holder 4 is located outside the fixing sleeve 11. That is, after the filament holder 4 is placed in the mounting cavity 22, when the filament holder 4 and the tungsten filament 5 are fixed, the fixing sleeve 11 will not interfere with the screw hole 6 on the filament holder 4, and the hexagonal tool can be used to screw the screw into the screw hole 6 to fix the filament holder 4 and the tungsten filament 5.

[0049] Optionally, the base 1 further includes a bottom plate 13, and the fixing sleeve 11 is located at the center of the bottom plate 13. In this embodiment, preferably, the thickness of the bottom plate 13 is 7 mm. The base 1 is thick enough to resist external interference and vibration, which greatly increases the stability of the tungsten filament 5 during installation. The entire device is placed on a workbench and will not move due to accidental contact, which is more convenient for experimenters to operate and ensures that the tungsten filament 5 is accurately installed.

[0050] The tungsten filament replacement and installation device provided in this embodiment realizes the rapid and accurate installation of the tungsten filament 5. Compared with the traditional manual installation, the installation time of the tungsten filament 5 can be shortened from the initial average of 30 minutes to less than 5 minutes, and the work efficiency is improved by 6 times. In addition, the service life of the tungsten filament 5 is also improved to varying degrees, from the previous average of 40 hours to the current average of 68.5 hours, and the filament life is increased by nearly 1.72 times, which effectively reduces the experimental detection cost.

[0051] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A tungsten filament replacement and installation device, characterized in that: include: The base (1) comprises a fixed sleeve (11), wherein a limiting member (111) is arranged on the inner side wall of the fixed sleeve (11), and a locking assembly (12) is arranged on the outer side wall; The mounting assembly (2) comprises a first mounting platform (21) coaxial with the fixing sleeve (11) and spaced apart from each other, the first mounting platform (21) defining a mounting cavity (22) in the fixing sleeve (11), the depth of the mounting cavity (22) being less than the height of a filament holder (4) of a tungsten filament (5), so that a screw hole (6) of the filament holder (4) is located outside the fixing sleeve (11), a second mounting platform (23) is protrudingly provided on the first mounting platform (21), the second mounting platform (23) is located at the center of the first mounting platform (21), and a filament pin hole (231) is provided on the second mounting platform (23), and the filament pin (3) of the tungsten filament (5) is inserted into the filament pin hole (231). The filament holder (4) of the tungsten filament (5) is arranged in the filament pin hole (231), the filament holder (4) is located in the installation cavity (22), and the first installation platform (21) and the second installation platform (23) are covered, the limiting member (111) can limit the filament holder (4), the locking assembly (12) abuts against the filament holder (4), a limiting groove (41) is arranged on the filament holder (4), the limiting member (111) and the limiting groove (41) are slidably matched, a plurality of the locking assemblies (12) are arranged at intervals in the circumferential direction of the fixing sleeve (11), and the plurality of the locking assemblies (12) press the filament holder (4) against the first installation platform (21).

2. The tungsten filament replacement and installation device according to claim 1, characterized in that: The second mounting platform (23) comprises a rectangular platform and semi-cylinders arranged at two ends of the rectangular platform, the rectangular platform and the semi-cylinders are integrally formed, and two filament pin holes (231) are arranged at intervals along the length direction of the rectangular platform.

3. The tungsten filament replacement and installation device according to claim 1, characterized in that: Each locking assembly (12) comprises an abutment rod (121) and a force-applying portion (122) arranged on the abutment rod (121); the abutment rod (121) passes through the fixing sleeve (11) and abuts against the filament holder (4).

4. The tungsten filament replacement and installation device according to claim 3, characterized in that: The fixing sleeve (11) is provided with a threaded hole in the radial direction, and the abutment rod (121) is threadedly connected to the fixing sleeve (11) through the threaded hole.

5. The tungsten filament replacement and installation device according to claim 1, characterized in that: The base (1) also includes a bottom plate (13), and the fixing sleeve (11) is located at the center of the bottom plate (13).

6. The tungsten filament replacement and installation device according to any one of claims 1 to 5, characterized in that: The base (1) and the mounting assembly (2) are both made of wear-resistant materials.

7. The tungsten filament replacement and installation device according to claim 6, characterized in that: The wear-resistant material includes brass.

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