An assembly fixture for a quadrupole mass analyzer and its usage method

Abstract

This application relates to the field of quadrupole mass analyzer technology and provides an assembly fixture for a quadrupole mass analyzer, including: a base, a first clamping fixture, a second clamping fixture, a third clamping fixture, a rectangular positioning component, and a cross-shaped equally spaced positioning component. This assembly fixture for the quadrupole mass analyzer can improve the assembly accuracy of the quadrupole mass analyzer, reduce the requirements for assembly personnel, and improve the production efficiency of the quadrupole mass analyzer. The cross-shaped equally spaced positioning component and the rectangular positioning component can define the relative positions between the four poles, and the first, second, and third clamping fixtures can fix the positions of the four poles and the ceramic base, making the assembly process more stable and achieving high-efficiency and high-precision assembly of the quadrupole mass analyzer.

Description

Technical Field

[0001] This invention relates to the field of quadrupole mass analyzer technology, and in particular to an assembly fixture for a quadrupole mass analyzer and its usage method. Background Technology

[0002] The quadrupole mass spectrometer is one of the most mature and widely used small mass spectrometers currently available. It is widely used in gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS) systems. The quadrupole is one of the most commonly used mass analyzers; by using multiple quadrupoles in series, multiplex mass spectrometry (Tendem MS) can be achieved to obtain structural information of the analytes.

[0003] In a quadrupole mass analyzer, the four electrode bars are arranged in pairs, each with an applied radio frequency (RF) alternating voltage. Ions located in this potential field are selected and stabilized, allowing them to reach the detector or enter subsequent analysis space. One of the technical challenges of quadrupole mass analyzers lies in the extremely high assembly precision required for the four bars; triple quadrupole mass analyzers used in liquid chromatography-mass spectrometry (LC-MS) require an assembly precision within 3 micrometers.

[0004] Currently, there are two main types of quadrupole mass analyzers commonly used. One type is the glued quadrupole, which mainly utilizes high-precision assembly fixtures to fix the quadrupole to a retaining ring or retaining barrel using adhesive, thereby achieving stable assembly accuracy requirements. However, the disadvantage of the glued quadrupole is that the adhesive bonding is applied only once, making it difficult to disassemble and reassemble after assembly. The other type is the dual-ceramic base quadrupole, which mainly uses a high-precision ceramic base to achieve a quadrupole mass analyzer with higher assembly accuracy. However, ensuring the assembly accuracy and reliability of the quadrupole requires a high level of skill in assembly and repair from the process engineers.

[0005] In the existing technology, the clamping of the quadrupole mass analyzer assembly fixture is not stable enough, and it is easy to loosen or shift position during movement; therefore, there is a need for an assembly fixture for the quadrupole mass analyzer with high assembly accuracy. Summary of the Invention

[0006] To overcome the problems existing in related technologies, the purpose of this invention is to provide an assembly fixture for a quadrupole mass analyzer. Compared with the one-time assembly and shaping of adhesive quadrupoles, the assembly fixture is used to assemble the ceramic pole base quadrupole, making the quadrupole mass analyzer easier to assemble and disassemble. It also allows the quadrupole to be removed for fine-tuning, gold plating, replacement, etc.

[0007] This application provides an assembly fixture for a quadrupole mass analyzer, including:

[0008] Base, first clamping fixture, second clamping fixture, third clamping fixture, rectangular positioning component, and cross-shaped equally divided positioning component;

[0009] The base includes a base plate, a fixing block, a positioning plate, and a protrusion. The protrusion is fixedly disposed at one end of the base plate, and the positioning plate is disposed at the other end of the base plate. The positioning plate has a through hole. The fixing block is fixedly disposed on the base plate and located between the protrusion and the positioning plate. Limiting plates are fixedly disposed on the front and rear sides of the top of the fixing block, and the fixing block and the front and rear limiting plates form a placement channel for placing the four poles to be assembled.

[0010] The first clamping fixture and the second clamping fixture are respectively disposed on both sides of the fixed block. The first clamping fixture is disposed on the positioning plate, and the second clamping fixture is disposed on the protrusion. The first clamping fixture and the second clamping fixture are used to fix the ceramic seat to be assembled. The third clamping fixture is disposed on one side of the placement channel. The third clamping fixture is used to fix the four pole rods to be assembled.

[0011] The cross-shaped positioning component includes a connecting block and four connecting plates. The four connecting plates are arranged along the axial direction of the connecting block and are fixedly connected to the connecting block. Adjacent connecting plates are arranged perpendicular to each other, and the connecting plates form a cross structure. The cross-shaped positioning component is used to define the relative position between the four pole rods to be assembled.

[0012] The rectangular positioning component has a cuboid structure, with square cross-sections at both ends. The four sides at both ends of the rectangular positioning component are used to define the relative positions between the four pole rods to be assembled.

[0013] The cross-shaped locating component is positioned at one end of the four poles to be assembled, and the rectangular locating component is positioned at the other end of the four poles to be assembled; the cross-shaped locating component and the rectangular locating component together define the relative positions between the four poles to be assembled.

[0014] The relative positions of the four pole rods are defined by using cross-shaped and rectangular positioning elements. The main function of the cross-shaped positioning elements is to determine the relative positions of the four pole rods and ensure the spacing between each pair of pole rods. The main function of the rectangular positioning elements is to determine the distance between the inscribed circles of the four pole rods, preventing the accumulation of assembly errors due to pole rod machining errors. Therefore, the two types of positioning elements must be used together to ensure the positional accuracy of the four pole rods. At the same time, the cross-shaped and rectangular positioning elements also serve as inspection tools to check whether the machining accuracy of the four pole rods and the ceramic parts meets the drawing requirements.

[0015] Preferably, the thickness of the connecting plate in the cross-shaped locating component is the minimum distance between any two of the four poles, and the dimensional tolerance of the cross-shaped locating component is a positive tolerance in the micrometer range; the side length of the square cross section at both ends of the rectangular locating component is the minimum distance between two relative poles, which is the diameter of the inscribed circle of the four poles, and the dimensional tolerance is a positive tolerance in the micrometer range; the four poles are usually made of materials such as SUS 316 or molybdenum, and ceramic is also used as the pole material in special cases; the surface treatment of the four poles usually uses surface treatment processes such as nickel plating or gold plating.

[0016] Preferably, the distance between the positioning plate and the fixing block depends on the specifications of the quadrupole mass analyzer to be assembled, i.e., it is determined based on the distance between the ceramic base and the end of the pole.

[0017] Preferably, the first U-shaped plate, the second U-shaped plate, and the clamping plate are made of polytetrafluoroethylene (PTFE). Using PTFE can prevent damage to the surface of the pole when the first U-shaped plate, the second U-shaped plate, and the clamping plate come into contact with the pole.

[0018] In one embodiment, a first groove is provided on each of the four sides between the two ends of the rectangular positioning member; by providing the first groove on the side, the friction between the pole rod and the side of the rectangular positioning member can be reduced; the rectangular positioning member can stabilize the position of the four pole rods while minimizing the friction between the rectangular positioning member and the pole rod.

[0019] In one embodiment, the diameter of the through hole is larger than the diameter of the circumscribed circle of the rectangular positioning member. Because a positioning plate is provided, the rectangular positioning member can be removed from the through hole when the four pole rods are positioned and assembled, which facilitates the disassembly of the rectangular positioning member.

[0020] In one embodiment, the connecting block is provided with a first threaded hole, which is arranged along the axial direction of the connecting block; by providing a first threaded hole in the connecting block, it is convenient to remove the cross-shaped positioning component after the quadrupole mass analyzer is assembled.

[0021] In one embodiment, the rectangular positioning member is provided with a second threaded hole, which is arranged along the axial direction of the rectangular positioning member; by providing a first threaded hole in the rectangular positioning member, it is convenient to remove the rectangular positioning member after the quadrupole mass analyzer is assembled.

[0022] In one embodiment, the through hole, the first threaded hole, and the second threaded hole are coaxial. By setting the through hole, the first threaded hole, and the second threaded hole coaxially, the four poles can be parallel to each other during positioning, thereby improving the accuracy of the position determination and assembly of the quadrupole mass analyzer.

[0023] In one embodiment, the positioning plate is provided with a first adjusting screw hole, and the first clamping fixture includes a first U-shaped plate, a first adjusting screw, and a first knob. The first U-shaped plate is disposed between the positioning plate and the fixing block. One end of the first adjusting screw is fixedly connected to the first U-shaped plate, and the other end of the first adjusting screw passes through the first adjusting screw hole and is fixedly connected to the first knob. By setting the first U-shaped plate, the first adjusting screw, and the first knob, the position of the first U-shaped plate is adjusted by the first adjusting screw and the first knob, thereby fixing the position of the ceramic seat between the first U-shaped plate and the fixing block, and thus realizing the assembly between the ceramic seat and the pole rod.

[0024] In one embodiment, the protrusion is provided with a second adjusting screw hole. The second clamping fixture includes a second U-shaped plate, a second adjusting screw, and a second knob. The second U-shaped plate is disposed between the protrusion and the fixed block. One end of the second adjusting screw is fixedly connected to the second U-shaped plate, and the other end of the second adjusting screw passes through the second adjusting screw and is fixedly connected to the second knob. By setting the second U-shaped plate, the second adjusting screw, and the second knob, the position of the second U-shaped plate is adjusted by the second adjusting screw and the second knob, thereby fixing the position of the ceramic seat between the second U-shaped plate and the fixed block, and thus realizing the assembly between the ceramic seat and the pole rod.

[0025] In one embodiment, the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel are coaxially arranged. By coaxially arranging the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel, the four pole rods can be better placed on the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel, thereby improving the accuracy of the position determination and assembly of the four pole rods.

[0026] Preferably, the cross-sectional shape of the groove in the first U-shaped plate, the cross-sectional shape of the groove in the second U-shaped plate, and the cross-sectional shape of the placement channel are the same, so that the four pole rods are more accurately positioned and assembled.

[0027] In one embodiment, the front or rear limiting plate is provided with a clamping groove. The third clamping fixture includes a clamping plate, a fixing plate, a third adjusting screw, and a third knob. The fixing plate is fixedly mounted on the limiting plate with the clamping groove. The fixing plate is provided with a third adjusting screw hole. The clamping plate is mounted on the clamping groove. One end of the third adjusting screw is fixedly connected to the clamping plate, and the other end of the third adjusting screw passes through the third adjusting screw hole and is fixedly connected to the third knob. By setting the clamping plate, the fixing plate, the third adjusting screw, and the third knob, the position of the clamping plate is adjusted. The position of the four pole pieces is adjusted from the side by the clamping plate, thereby realizing the fixed position of the four pole mass analyzer in the side direction and improving the assembly accuracy.

[0028] In one embodiment, the ratio of the length of the cross-shaped positioning component to the length of the pole to be assembled is 1:(12-15); the ratio of the length of the rectangular positioning component to the length of the pole to be assembled is 1:(6-8). By setting the length of the cross-shaped positioning component, the cross-shaped positioning component can accurately fix the positional relationship between the four poles while reducing the contact area between the cross-shaped positioning component and the pole, thus reducing friction between the cross-shaped positioning component and the four poles and preventing damage to the poles. By setting the length of the rectangular positioning component, the rectangular positioning component can accurately fix the positional relationship between the four poles while reducing the contact area between the rectangular positioning component and the poles, thus reducing friction between the rectangular positioning component and the four poles and preventing damage to the poles.

[0029] Secondly, the present invention also provides a method for using the assembly fixture of the above-mentioned quadrupole mass analyzer, comprising:

[0030] The four poles to be assembled are passed through two ceramic seats and placed on the placement channel. The ceramic seats are placed between the first clamping fixture and the fixing block and between the second clamping fixture and the fixing block, respectively. One end of the four poles to be assembled is pressed against the positioning plate to align the poles in the length direction.

[0031] Place the cross-shaped positioning piece and the rectangular positioning piece at both ends of the four poles to be assembled, and adjust the relative positions of the four poles.

[0032] Tighten the first and second clamping fixtures to determine the positions of the two ceramic seats. Then tighten the third clamping fixture to fix the side positions of the four pole rods. Fix the top two pole rods to the ceramic seats with screws.

[0033] Loosen the first clamping fixture, the second clamping fixture, and the third clamping fixture; rotate the four poles and the ceramic seat 180 degrees; then tighten the first clamping fixture, the second clamping fixture, and the third clamping fixture; and fix the other two poles to the ceramic seat with screws.

[0034] Remove the rectangular positioning component and the cross-shaped equally spaced positioning component from the four pole rods, and loosen the first clamping fixture, the second clamping fixture, and the third clamping fixture to obtain the four pole rod mass analyzer.

[0035] The rectangular positioning component has screw holes, which can be removed from the four poles using a screwdriver. The cross-shaped equally spaced positioning component also has screw holes, which can be removed from the four poles using a screwdriver.

[0036] In one embodiment, a rectangular positioning member is placed at one end of the four pole rods near the positioning plate, and a cross-shaped equidistant positioning member is placed at one end of the four pole rods away from the positioning plate. When it is necessary to assemble the pre-rods, the pre-rods can be connected to the ends of the four pole rods away from the positioning plate by spacers, and the positions between the pre-rods can be determined by the cross-shaped equidistant positioning member.

[0037] The beneficial effects of this invention are as follows:

[0038] The assembly fixture for the aforementioned quadrupole mass analyzer includes a base, a first clamping fixture, a second clamping fixture, a third clamping fixture, a rectangular positioning component, and a cross-shaped equally spaced positioning component. The rectangular and cross-shaped equally spaced positioning components work together to define the relative positions of the four poles and also function as inspection tools to check whether the machining accuracy of the four poles and the ceramic component meets the drawing requirements. The first, second, and third clamping fixtures work together to fix the positions of the four poles and the ceramic base. The first and second threaded holes on the cross-shaped and rectangular positioning components reduce their weight and facilitate disassembly after assembly. When adjustments are needed to the assembled quadrupole mass analyzer, it can be disassembled and reassembled, overcoming the drawback of glued quadrupoles that are difficult to disassemble and reassemble after initial shaping. The assembly fixture for this quadrupole mass analyzer not only ensures the assembly accuracy and reliability of the quadrupole mass analyzer, but also allows for easy disassembly and cleaning of the assembled quadrupole mass analyzer.

[0039] The placement channel, the groove in the first U-shaped plate, and the groove in the second U-shaped plate form the placement area for the four pole rods. The four pole rods to be assembled are passed through the two ceramic seats and placed on the placement channel. The ceramic seats are placed between the first clamping fixture and the fixing block, and between the second clamping fixture and the fixing block, respectively. One end of each of the four pole rods to be assembled is placed against the positioning plate to align them along their length. The cross-shaped and rectangular positioning pieces are placed at both ends of the four pole rods to be assembled, and the relative positions of the four pole rods are adjusted. The first and second clamping fixtures are tightened to determine the positions of the two ceramic seats. Then, the third clamping fixture is tightened to fix the side positions of the four pole rods. The top is secured with screws. Two poles are fixed to the ceramic base; loosen the first, second, and third clamping fixtures, rotate the four poles and the ceramic base 180 degrees, then tighten the first, second, and third clamping fixtures, and fix the other two poles to the ceramic base with screws; remove the rectangular positioning piece and the cross-shaped dividing positioning piece from the four poles, loosen the first, second, and third clamping fixtures, and obtain the quadrupole mass analyzer; by setting the cross-shaped dividing positioning piece and the rectangular positioning piece, the position between the four poles can be defined, and by setting the first, second, and third clamping fixtures, the assembly accuracy of the quadrupole mass analyzer can be greatly improved.

[0040] The assembly fixture of the quadrupole mass analyzer of this invention can improve the assembly accuracy of the quadrupole mass analyzer, reduce the requirements for assembly personnel, and improve the production efficiency of the quadrupole mass analyzer. The cross-shaped and rectangular positioning parts can define the relative positions between the four poles, and the first, second, and third clamping fixtures can fix the positions of the four poles and the ceramic seat, making the assembly process more stable and achieving high-efficiency and high-precision assembly of the quadrupole mass analyzer.

[0041] Existing ceramic quadrupoles mainly rely on the repair and processing of high-precision ceramic bases, which requires high-level repair and assembly skills from process personnel. The quadrupole quality analyzer assembly fixture designed in this invention reduces the dependence on highly skilled assembly personnel. Ordinary assembly personnel can also ensure the assembly accuracy and reliability of the quadrupole using this fixture.

[0042] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0043] Figure 1 This is a three-dimensional structural diagram of the assembly fixture for the quadrupole mass analyzer in the embodiment;

[0044] Figure 2 This is a side view of the assembly fixture for the quadrupole mass analyzer in the embodiment.

[0045] Figure 3 A top view of the assembly fixture for the quadrupole mass analyzer in the embodiment;

[0046] Figure 4 A schematic diagram of the rectangular positioning component structure of the assembly tooling for the quadrupole mass analyzer in the embodiment;

[0047] Figure 5 A schematic diagram of the cross-shaped positioning component structure of the assembly tooling for the quadrupole mass analyzer in the embodiment.

[0048] Figure 6 A schematic diagram of the pole structure to be assembled in the assembly fixture of the quadrupole mass analyzer in the embodiment.

[0049] Figure 7 A schematic diagram of the ceramic base structure to be assembled in the assembly tooling of the quadrupole mass analyzer in the embodiment.

[0050] Figure 8 A schematic diagram of the assembly fixture for the quadrupole mass analyzer in this embodiment, showing the cross-shaped positioning component and the pole assembly.

[0051] Figure 9 A schematic diagram of the rectangular positioning component and pole assembly of the assembly tooling for the quadrupole mass analyzer in the embodiment.

[0052] Figure 10 A schematic diagram of the assembly fixture for the quadrupole mass analyzer in this embodiment, showing the cross-shaped locating component and the pre-rod assembly.

[0053] Figure 11 A schematic diagram of the quadrupole mass analyzer after assembly in the embodiment.

[0054] Figure label:

[0055] 1. Base; 11. Positioning plate; 12. Placement channel; 13. Protrusion; 2. First clamping fixture; 3. Second clamping fixture; 4. Third clamping fixture; 5. Rectangular positioning component; 51. First groove; 52. Second threaded hole; 6. Cross-shaped equally spaced positioning component; 61. Connecting block; 62. Connecting plate; 63. First threaded hole; 7. Pole rod; 8. Ceramic seat; 9. Pre-rod. Detailed Implementation

[0056] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “described,” and “the” as used in the invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0058] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another.

[0059] Unless otherwise specified, the methods and equipment used in this invention are all conventional reagents, methods and equipment in this technical field.

[0060] To facilitate understanding of the embodiments of the present invention, the assembly fixtures for quadrupole mass analyzers in related technologies will first be described. In related technologies, the assembly skills required of process engineers are often highly developed, there is a high reliance on senior assembly personnel, and assembly efficiency is low. Based on this, this application provides an assembly fixture for a quadrupole mass analyzer.

[0061] As shown in the attached figures, the assembly fixture for a quadrupole mass analyzer provided in Embodiment 1 of the present invention includes:

[0062] 1. Base; 2. First clamping fixture; 3. Second clamping fixture; 4. Third clamping fixture; 5. Rectangular positioning component; and 6. Cross-shaped equally spaced positioning component.

[0063] The base 1 includes a base plate, a fixing block, a positioning plate 11, and a protrusion 13. The protrusion 13 is fixedly disposed at one end of the base plate, and the positioning plate 11 is disposed at the other end of the base plate. The positioning plate 11 has a through hole. The fixing block is fixedly disposed on the base plate and located between the protrusion 13 and the positioning plate 11. Limiting plates are fixedly disposed on the front and rear sides of the top of the fixing block, and the fixing block and the front and rear limiting plates form a placement channel 12. The placement channel 12 is used to place the four pole rods 7 to be assembled.

[0064] The first clamping fixture 2 and the second clamping fixture 3 are respectively disposed on both sides of the fixing block. The first clamping fixture 2 is disposed on the positioning plate 11, and the second clamping fixture 3 is disposed on the protrusion 13. The first clamping fixture 2 and the second clamping fixture 3 are used to fix the ceramic seat 8 to be assembled. The third clamping fixture 4 is disposed on one side of the placement channel 12. The third clamping fixture 4 is used to fix the four pole rods 7 to be assembled.

[0065] The cross-shaped positioning component 6 includes a connecting block 61 and four connecting plates 62. The four connecting plates 62 are arranged along the axial direction of the connecting block 61 and are fixedly connected to the connecting block 61. Adjacent connecting plates 62 are arranged perpendicular to each other, and the connecting plates 62 form a cross structure. The cross-shaped positioning component 6 is used to define the relative position between the four pole rods 7 to be assembled.

[0066] The rectangular positioning component 5 has a cuboid structure, and the cross-sections at both ends of the rectangular positioning component 5 are square. The four sides at both ends of the rectangular positioning component 5 are used to define the relative positions between the four pole rods 7 to be assembled.

[0067] The cross-shaped positioning component 6 is disposed at one end of the four pole rods 7 to be assembled, and the rectangular positioning component 5 is disposed at the other end of the four pole rods 7 to be assembled; the cross-shaped positioning component 6 and the rectangular positioning component 5 together define the relative positions between the four pole rods 7 to be assembled.

[0068] The relative positions of the four pole rods 7 are defined by setting up a cross-shaped locating element 6 and a rectangular locating element 5. The main function of the cross-shaped locating element 6 is to determine the relative positions of the four pole rods 7 and ensure the spacing between each pair of pole rods 7. The main function of the rectangular locating element 5 is to determine the distance between the inscribed circles of the four pole rods 7, preventing the accumulation of assembly errors due to machining errors of the pole rods 7. Therefore, the two locating elements must be used together to ensure the positional accuracy of the four pole rods 7. At the same time, the cross-shaped locating element 6 and the rectangular locating element 5 also serve as inspection tools to check whether the machining accuracy of the four pole rods 7 and the ceramic parts meets the drawing requirements.

[0069] Preferably, the thickness of the connecting plate 62 in the cross-shaped locating component 6 is the minimum distance between each pair of the four pole rods 7, and the dimensional tolerance of the cross-shaped locating component 6 is a positive tolerance in the micrometer range; the side length of the square cross section at both ends of the rectangular locating component 5 is the minimum distance between two relative pole rods 7, which is the diameter of the inscribed circle of the four pole rods 7, and the dimensional tolerance is a positive tolerance in the micrometer range; the four pole rods 7 are usually made of materials such as SUS 316 and molybdenum, and ceramic is also used as the material for pole rods 7 in special cases; the surface treatment of the four pole rods 7 usually uses surface treatment processes such as nickel plating and gold plating.

[0070] Preferably, the distance between the positioning plate 11 and the fixing block depends on the specifications of the quadrupole mass analyzer to be assembled, i.e., it is determined based on the distance between the ceramic seat 8 and the end of the pole 7.

[0071] Preferably, the first U-shaped plate, the second U-shaped plate, and the pressing plate are made of polytetrafluoroethylene (PTFE). Using PTFE can prevent damage to the surface of the pole 7 when the first U-shaped plate, the second U-shaped plate, and the pressing plate come into contact with the pole 7.

[0072] In a preferred embodiment of this application, the rectangular positioning member 5 has a first groove on each of its four sides between its two ends. By providing the first groove 51 on the side, the friction between the pole rod 7 and the side of the rectangular positioning member 5 can be reduced. The rectangular positioning member 5 can stabilize the position of the four pole rods 7 while minimizing the friction between the rectangular positioning member 5 and the pole rods 7.

[0073] In a preferred embodiment of this application, the diameter of the through hole is larger than the diameter of the circumscribed circle of the rectangular positioning member 5. Due to the provision of the positioning plate 11, the rectangular positioning member 5 can be removed from the through hole when the positioning and assembly of the four pole rods 7 are completed, which facilitates the disassembly of the rectangular positioning member 5.

[0074] In a preferred embodiment of this application, the connecting block 61 is provided with a first threaded hole 63, which is arranged along the axial direction of the connecting block 61; by providing a first threaded hole 63 in the connecting block 61, it is convenient to remove the cross-shaped positioning component 6 after the quadrupole mass analyzer is assembled.

[0075] In a preferred embodiment of this application, the rectangular positioning member 5 is provided with a second threaded hole 52, which is arranged along the axial direction of the rectangular positioning member 5; by providing a first threaded hole 63 in the rectangular positioning member 5, it is convenient to remove the rectangular positioning member 5 after the quadrupole mass analyzer is assembled.

[0076] In a preferred embodiment of this application, the through hole, the first threaded hole 63, and the second threaded hole 52 are coaxial. By setting the through hole, the first threaded hole 63, and the second threaded hole 52 coaxially, the four pole rods 7 can be parallel to each other during positioning, thereby improving the accuracy of the position determination and assembly of the quadrupole mass analyzer.

[0077] In a preferred embodiment of this application, the positioning plate 11 is provided with a first adjusting screw hole. The first clamping fixture 2 includes a first U-shaped plate, a first adjusting screw, and a first knob. The first U-shaped plate is disposed between the positioning plate 11 and the fixing block. One end of the first adjusting screw is fixedly connected to the first U-shaped plate, and the other end of the first adjusting screw passes through the first adjusting screw hole and is fixedly connected to the first knob. By setting the first U-shaped plate, the first adjusting screw, and the first knob, the position of the first U-shaped plate is adjusted by the first adjusting screw and the first knob, thereby fixing the position of the ceramic seat 8 between the first U-shaped plate and the fixing block, and thus realizing the assembly between the ceramic seat 8 and the pole rod 7.

[0078] In a preferred embodiment of this application, the protrusion 13 is provided with a second adjusting screw hole. The second clamping fixture 3 includes a second U-shaped plate, a second adjusting screw, and a second knob. The second U-shaped plate is disposed between the protrusion 13 and the fixing block. One end of the second adjusting screw is fixedly connected to the second U-shaped plate, and the other end of the second adjusting screw passes through the second adjusting screw and is fixedly connected to the second knob. By setting the second U-shaped plate, the second adjusting screw, and the second knob, the position of the second U-shaped plate is adjusted by the second adjusting screw and the second knob, thereby fixing the position of the ceramic seat 8 between the second U-shaped plate and the fixing block, and thus realizing the assembly between the ceramic seat 8 and the pole rod 7.

[0079] In a preferred embodiment of this application, the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel 12 are coaxially arranged. By coaxially arranging the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel 12, the four pole rods 7 can be better placed on the grooves of the first U-shaped plate, the second U-shaped plate, and the placement channel 12, thereby improving the accuracy of the position determination and assembly of the four pole rods 7.

[0080] Preferably, the cross-sectional shape of the groove of the first U-shaped plate, the cross-sectional shape of the groove of the second U-shaped plate, and the cross-sectional shape of the placement channel 12 are the same, so that the four pole rods 7 have higher positioning accuracy and assembly precision.

[0081] In a preferred embodiment of this application, the front or rear limiting plate is provided with a clamping groove. The third clamping fixture 4 includes a clamping plate, a fixing plate, a third adjusting screw, and a third knob. The fixing plate is fixedly mounted on the limiting plate with the clamping groove. The fixing plate is provided with a third adjusting screw hole. The clamping plate is mounted on the clamping groove. One end of the third adjusting screw is fixedly connected to the clamping plate, and the other end of the third adjusting screw passes through the third adjusting screw hole and is fixedly connected to the third knob. By setting the clamping plate, the fixing plate, the third adjusting screw, and the third knob, the position of the clamping plate is adjusted. The position of the four pole rods 7 is adjusted from the side by the clamping plate, thereby realizing the fixed position of the four pole mass analyzer in the side direction and improving the assembly accuracy.

[0082] In a preferred embodiment of this application, the ratio of the length of the cross-shaped positioning member 6 to the length of the pole rod 7 to be assembled is 1:(12-15); the ratio of the length of the rectangular positioning member 5 to the length of the pole rod 7 to be assembled is 1:(6-8). By setting the length of the cross-shaped positioning member 6, the cross-shaped positioning member 6 can accurately fix the positional relationship between the four pole rods 7 while reducing the contact area between the cross-shaped positioning member 6 and the pole rods 7, thereby reducing friction between the cross-shaped positioning member 6 and the four pole rods 7 and avoiding damage to the pole rods 7. By setting the length of the rectangular positioning member 5, the rectangular positioning member 5 can accurately fix the positional relationship between the four pole rods 7 while reducing the contact area between the rectangular positioning member 5 and the pole rods 7, thereby reducing friction between the rectangular positioning member 5 and the four pole rods 7 and avoiding damage to the pole rods 7.

[0083] The assembly fixture for the aforementioned quadrupole mass analyzer includes a base 1, a first clamping fixture 2, a second clamping fixture 3, a third clamping fixture 4, a rectangular positioning component 5, and a cross-shaped equally spaced positioning component 6. The rectangular positioning component 5 and the cross-shaped equally spaced positioning component 6 work together to define the relative positions of the four poles 7 and also function as a gauge to check whether the machining accuracy of the four poles 7 and the ceramic component meets the drawing requirements. The first clamping fixture 2, the second clamping fixture 3, and the third clamping fixture 4 work together to fix the positions of the four poles 7 and the ceramic base 8. The first threaded hole 63 and the second threaded hole 52 on the cross-shaped equally spaced positioning component 6 and the rectangular positioning component 5 reduce their weight and facilitate disassembly after assembly. When adjustments to the assembled quadrupole mass analyzer are needed, it can be disassembled and reassembled, overcoming the drawback of glued quadrupoles being fixed in shape only once and difficult to disassemble and reassemble after assembly. The assembly fixture for this quadrupole mass analyzer not only ensures the assembly accuracy and reliability of the quadrupole mass analyzer, but also allows for easy disassembly and cleaning of the assembled quadrupole mass analyzer.

[0084] The assembly fixture of the quadrupole mass analyzer of the present invention can improve the assembly accuracy of the quadrupole mass analyzer, reduce the requirements for assembly personnel, and improve the production efficiency of the quadrupole mass analyzer. The cross-shaped positioning component 6 and the rectangular positioning component 5 can limit the relative position between the four poles 7. The first clamping fixture 2, the second clamping fixture 3, and the third clamping fixture 4 can fix the position of the four poles 7 and the ceramic seat 8, making the assembly process more stable and realizing the high-efficiency and high-precision assembly of the quadrupole mass analyzer.

[0085] Existing ceramic quadrupoles mainly rely on the repair and processing of high-precision ceramic bases 1, which requires high repair and assembly skills from process personnel. The quadrupole quality analyzer assembly fixture designed in this invention reduces the dependence on highly skilled assembly personnel. Ordinary assembly personnel can also ensure the assembly accuracy and reliability of the quadrupole using this fixture.

[0086] Embodiment 2 of the invention provides a method for using the assembly fixture of the above-mentioned quadrupole mass analyzer, including:

[0087] The four pole rods 7 to be assembled are passed through the two ceramic seats 8 and placed on the placement channel 12. The ceramic seats 8 are respectively placed between the first clamping fixture 2 and the fixing block, and between the second clamping fixture 3 and the fixing block. One end of the four pole rods 7 to be assembled is pressed against the positioning plate 11 so that the pole rods 7 are aligned in the length direction.

[0088] Place the cross-shaped positioning piece 6 and the rectangular positioning piece 5 at both ends of the four pole rods 7 to be assembled, and adjust the relative positions of the four pole rods 7.

[0089] Tighten the first clamping fixture 2 and the second clamping fixture 3 to determine the position of the two ceramic seats 8, then tighten the third clamping fixture 4 to fix the side position of the four pole rods 7, and fix the top two pole rods 7 to the ceramic seats 8 with screws.

[0090] Loosen the first clamping fixture 2, the second clamping fixture 3, and the third clamping fixture 4, rotate the four pole rods 7 and the ceramic seat 8 180 degrees, then tighten the first clamping fixture 2, the second clamping fixture 3, and the third clamping fixture 4, and fix the other two pole rods 7 to the ceramic seat 8 with screws.

[0091] Remove the rectangular positioning piece 5 and the cross-shaped equally divided positioning piece 6 from the four pole rods 7, and loosen the first clamping fixture 2, the second clamping fixture 3 and the third clamping fixture 4 to obtain the quadrupole mass analyzer.

[0092] The rectangular positioning component 5 has screw holes, which can be removed from the four pole rods 7 using a screwdriver. The cross-shaped equally spaced positioning component 6 has screw holes, which can be removed from the four pole rods 7 using a screwdriver.

[0093] In one embodiment, a rectangular positioning member 5 is placed at one end of the four pole rods 7 near the positioning plate 11, and a cross-shaped equally spaced positioning member 6 is placed at one end of the four pole rods 7 away from the positioning plate 11. When it is necessary to assemble the pre-rod 9, the pre-rod 9 can be connected to the end of the four pole rods 7 away from the positioning plate 11 by a spacer, and the position between the pre-rod 9 can be determined by the cross-shaped equally spaced positioning member 6.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An assembly fixture for a quadrupole mass analyzer, characterized in that, include: The system includes a base, a first clamping fixture, a second clamping fixture, a third clamping fixture, a rectangular positioning component, and a cross-shaped equally spaced positioning component; the base is used to install the first clamping fixture, the second clamping fixture, and the third clamping fixture. The cross-shaped positioning component includes a connecting block and four connecting plates. The four connecting plates are arranged along the axial direction of the connecting block and are fixedly connected to the connecting block. Adjacent connecting plates are arranged perpendicular to each other, and the connecting plates form a cross structure. The rectangular positioning component has a cuboid structure, with square cross-sections at both ends. The four sides at both ends of the rectangular positioning component are used to define the relative positions between the four pole rods to be assembled. The cross-shaped locating component is positioned at one end of the four pole rods to be assembled, and the rectangular locating component is positioned at the other end of the four pole rods to be assembled; the cross-shaped locating component and the rectangular locating component together define the relative positions between the four pole rods to be assembled; the first clamping fixture, the second clamping fixture, and the third clamping fixture clamp the pole rods to be assembled.

2. The assembly fixture for the quadrupole mass analyzer according to claim 1, characterized in that: The base includes a base plate, a fixing block, a positioning plate, and a protrusion. The protrusion is fixedly disposed at one end of the base plate, and the positioning plate is disposed at the other end of the base plate. The positioning plate has a through hole. The fixing block is fixedly disposed on the base plate and located between the protrusion and the positioning plate. Limiting plates are fixedly disposed on the front and rear sides of the top of the fixing block, and the fixing block and the front and rear limiting plates form a placement channel. The first clamping fixture and the second clamping fixture are respectively disposed on both sides of the fixed block. The first clamping fixture is disposed on the positioning plate, the second clamping fixture is disposed on the protrusion, and the third clamping fixture is disposed on one side of the placement channel.

3. The assembly fixture for the quadrupole mass analyzer according to claim 1, characterized in that: The connecting block is provided with a first threaded hole, which is arranged along the axial direction of the connecting block.

4. The assembly fixture for the quadrupole mass analyzer according to claim 1, characterized in that: The rectangular positioning component is provided with a second threaded hole, which is arranged along the axial direction of the rectangular positioning component.

5. The assembly fixture for the quadrupole mass analyzer according to claim 2, characterized in that: The positioning plate is provided with a first adjusting screw hole. The first clamping fixture includes a first U-shaped plate, a first adjusting screw, and a first knob. The first U-shaped plate is disposed between the positioning plate and the fixing block. One end of the first adjusting screw is fixedly connected to the first U-shaped plate, and the other end of the first adjusting screw passes through the first adjusting screw hole and is fixedly connected to the first knob.

6. The assembly fixture for the quadrupole mass analyzer according to claim 5, characterized in that: The protrusion is provided with a second adjusting screw hole. The second clamping fixture includes a second U-shaped plate, a second adjusting screw, and a second knob. The second U-shaped plate is disposed between the protrusion and the fixed block. One end of the second adjusting screw is fixedly connected to the second U-shaped plate, and the other end of the second adjusting screw passes through the second adjusting screw and is fixedly connected to the second knob.

7. The assembly fixture for the quadrupole mass analyzer according to claim 6, characterized in that: The grooves of the first U-shaped plate, the grooves of the second U-shaped plate, and the placement channel are coaxially arranged.

8. The assembly fixture for the quadrupole mass analyzer according to claim 2, characterized in that: The front or rear limiting plate is provided with a pressing groove. The third pressing fixture includes a pressing plate, a fixing plate, a third adjusting screw, and a third knob. The fixing plate is fixedly mounted on the limiting plate with the pressing groove. The fixing plate is provided with a third adjusting screw hole. The pressing plate is mounted on the pressing groove. One end of the third adjusting screw is fixedly connected to the pressing plate, and the other end of the third adjusting screw passes through the third adjusting screw hole and is fixedly connected to the third knob.

9. The assembly fixture for the quadrupole mass analyzer according to claim 1, characterized in that: The ratio of the length of the cross-shaped positioning component to the length of the pole to be assembled is 1:(12-15); the ratio of the length of the rectangular positioning component to the length of the pole to be assembled is 1:(6-8).

10. A method of using an assembly fixture for a quadrupole mass analyzer according to any one of claims 1-9, characterized in that, include: The four poles to be assembled are passed through two ceramic seats and placed on the placement channel. The ceramic seats are placed between the first clamping fixture and the fixing block and between the second clamping fixture and the fixing block, respectively. One end of the four poles to be assembled is pressed against the positioning plate to align the poles in the length direction. Place the cross-shaped positioning piece and the rectangular positioning piece at both ends of the four poles to be assembled, and adjust the relative positions of the four poles. Tighten the first and second clamping fixtures to determine the positions of the two ceramic seats. Then tighten the third clamping fixture to fix the side positions of the four pole rods. Fix the top two pole rods to the ceramic seats with screws. Loosen the first clamping fixture, the second clamping fixture, and the third clamping fixture; rotate the four poles and the ceramic seat 180 degrees; then tighten the first clamping fixture, the second clamping fixture, and the third clamping fixture; and fix the other two poles to the ceramic seat with screws. Remove the rectangular positioning component and the cross-shaped equally spaced positioning component from the four pole rods, and loosen the first clamping fixture, the second clamping fixture, and the third clamping fixture to obtain the quadrupole mass analyzer.

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