An assembly device and an assembly method for a quadrupole mass analyzer

Abstract

The present invention discloses an assembly device for a quadrupole mass analyzer, which belongs to the field of mass spectrometry technology. A connecting plate receives a fixed barrel of a quadrupole mass analyzer, and two mounting ends receive two ends of a pole of the quadrupole mass analyzer respectively. Each mounting end is provided with a mounting groove, and the end of the pole is located in the mounting groove. A tensioning member is mounted on the mounting end and cooperates with the pole to tighten each pole. A differential head is rotatably mounted on the mounting end and extends into the mounting groove. The end of the differential head contacts the pole to move the pole in the mounting groove to adjust the relative position between the four poles. The present application only requires common parts such as a differential head to adjust the position of the pole, and does not require high-precision parts that are difficult to process. Since the differential head rotates to contact the pole to adjust the position of the pole, the assembly device can assemble quadrupoles of different sizes, and has strong versatility. The present invention also relates to an assembly method for a quadrupole mass analyzer implemented by the above-mentioned assembly device for a quadrupole mass analyzer.

Description

Technical Field

[0001] The present invention relates to mass spectrometry technology, and in particular to an assembly device and an assembly method for a quadrupole mass analyzer. Background Art

[0002] A mass spectrometer is a chemical instrument for identifying substances based on their relative molecular masses. Mass spectrometers belong to the category of high-end scientific instruments, along with electron microscopes, nuclear magnetic resonance, etc. Domestic mid-range commercial instruments of liquid chromatography-mass spectrometry triple quadrupole mass spectrometers have only emerged in the past two years. The research and development difficulty of liquid chromatography-mass spectrometry triple quadrupole mass spectrometers lies in the core component, the quadrupole mass analyzer. The liquid chromatography-mass spectrometry quadrupole mass analyzer requires extremely high assembly precision, generally within 2 μm.

[0003] Currently, the commonly used quadrupole mass analyzers include two forms. One is the double ceramic pole seat quadrupole. This type of quadrupole mainly obtains a quadrupole mass analyzer with good assembly precision by grinding the ceramic pole seat. The other is the glued quadrupole, which mainly uses a high-precision assembly tooling to fix the pole through gluing on a fixed barrel (or other forms of fixed outer rings, etc.), so as to meet the requirements of stable assembly precision. The latter does not rely on the grinding and assembly skills of technicians and is more convenient for mass production. Therefore, the current assembly research mainly focuses on the latter.

[0004] The existing glued quadrupole assembly devices require difficult-to-machine high-precision parts such as high-precision right angles and cylindrical surfaces, resulting in high costs and difficult processing of the quadrupole assembly devices; and the existing quadrupole assembly devices can only assemble quadrupole mass analyzers with fixed sizes, with poor versatility. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide an assembly device with low processing precision requirements and capable of assembling quadrupoles of different sizes.

[0006] In order to overcome the deficiencies of the prior art, another purpose of the present invention is to provide an assembly method with low processing precision requirements and capable of assembling quadrupoles of different sizes.

[0007] One of the purposes of the present invention is achieved by adopting the following technical solutions:

[0008] An assembly device for a quadrupole mass analyzer, which is used to assemble a quadrupole mass analyzer, includes a base, a plurality of micrometers, and a plurality of tensioning members. The base includes a connecting plate and mounting ends located at both ends of the connecting plate. The connecting plate receives the fixing barrel of the quadrupole mass analyzer, and the two mounting ends respectively receive both ends of the pole of the quadrupole mass analyzer. Each mounting end is provided with a mounting groove, and the end of the pole is located in the mounting groove. The tensioning member is installed on the mounting end and cooperates with the pole to tension each pole. The micrometer is rotatably installed on the mounting end and extends into the mounting groove, and the end of the micrometer abuts against the pole to move the pole in the mounting groove to adjust the relative positions between the four poles.

[0009] Further, the tensioning member is a flexible belt or a spring.

[0010] Further, when the tensioning member is a flexible belt, the assembly device for the quadrupole mass analyzer further includes a mounting member, the mounting member is fixed to the mounting end, and both ends of the tensioning member are respectively sleeved on the mounting member and the pole.

[0011] Further, when the tensioning member is a spring, both ends of the spring are respectively connected to the mounting end and the pole, and the spring provides tension for the pole.

[0012] Further, the assembly device for the quadrupole mass analyzer further includes a fastener, the number of fasteners is the same as the number of micrometers, and the fastener is installed on the mounting end and abuts against the micrometer to lock the micrometer with the mounting end.

[0013] Further, the mounting groove is provided with a contact surface, the contact surface abuts against the side walls of the two poles, and the flatness and coplanarity of the contact surfaces of the two mounting ends are both within 1 μm.

[0014] Further, the mounting groove is provided with an abutting surface, the abutting surface is perpendicular to the contact surface and is located on one side of the contact surface, the abutting surface abuts against the side wall of one pole, and the abutting surface and the contact surface position one pole.

[0015] Further, the number of micrometers at each mounting end is 5, the positions of the two poles are respectively adjusted by the two micrometers, and the side wall of the other pole abuts against the contact surface and the position is adjusted by one micrometer.

[0016] The second object of the present invention is achieved by adopting the following technical solution:

[0017] A method for assembling a quadrupole mass analyzer implemented by using the assembly device for the quadrupole mass analyzer according to any one of the above, includes the following steps:

[0018] Rough assembly: install the quadrupole mass analyzer on the assembly device of the quadrupole mass analyzer, so that the fixed barrel is located on the connecting plate of the base, and the two ends of the pole are respectively located in the mounting grooves of the mounting end. Use a common length measuring device to assemble the quadrupole mass analyzer to a comprehensive accuracy of less than 10μm;

[0019] Calculate the size: By using the field circle radius r0 and the pole radius r, solve the theoretical values of the adjacent pole and opposite pole external dimensions;

[0020] One-end assembly accuracy adjustment: adjust the position of one end of each pole in the installation slot through the differential head, so that the error between the actual value and the theoretical value of the adjacent pole's external measurement size is less than the threshold value, and the error between the actual value and the theoretical value of the opposite pole's external measurement size is less than the threshold value;

[0021] Adjustment of the assembly accuracy at the other end: adjust the position of the other end of each pole in the mounting slot through the differential head so that the error between the actual value and the theoretical value of the outer dimension of the adjacent pole is less than the threshold value, and the error between the actual value and the theoretical value of the outer dimension of the opposite pole is less than the threshold value.

[0022] Furthermore, it also includes a fixing step, which specifically includes: adjusting the connecting column according to the adjusted position of the pole, and fixing the connecting column and the fixing barrel by fixing glue.

[0023] Compared with the prior art, the assembly device of the quadrupole mass analyzer of the present invention includes a base, a plurality of differential heads and a plurality of tensioning members, the base includes a connecting plate and mounting ends located at both ends of the connecting plate, the connecting plate receives a fixed barrel of the quadrupole mass analyzer, the two mounting ends respectively receive two ends of a pole of the quadrupole mass analyzer, each mounting end is provided with a mounting groove, the pole end is located in the mounting groove, the tensioning member is installed on the mounting end and cooperates with the pole so that each pole is tightened, the differential head is rotatably installed on the mounting end and extends into the mounting groove, the end of the differential head contacts the pole so that the pole moves in the mounting groove to adjust the relative position between the four poles, through the above design, only common parts such as the differential head are needed to adjust the position of the pole, and no high-precision parts that are difficult to process are required, in addition, because the differential head rotates to contact the pole to adjust the position of the pole, the assembly device can assemble quadrupoles of different sizes, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional diagram of a quadrupole mass analyzer;

[0025] Figure 2 for Figure 1 Front view of the quadrupole mass analyzer;

[0026] Figure 3 A three-dimensional diagram of an assembly device for a quadrupole mass analyzer of the present application;

[0027] Figure 4For Figure 3 Stereogram of the base of the assembly device for the quadrupole mass analyzer;

[0028] Figure 5 For Figure 4 Enlarged view of the mounting base at location A;

[0029] Figure 6 Stereogram of the quadrupole mass analyzer being assembled by the assembly device of the quadrupole mass analyzer of the present application;

[0030] Figure 7 Schematic diagram of the dimensional process of adjusting one end face during the assembly process of the quadrupole mass analyzer in one embodiment;

[0031] Figure 8 For Figure 7 Schematic diagram of the adjustment process when the assembly device of the quadrupole mass analyzer assembles the quadrupole mass analyzer;

[0032] Figure 9 Schematic diagram of the dimensional process of adjusting one end face during the assembly process of the quadrupole mass analyzer in another embodiment.

[0033] In the figure: 10. Quadrupole mass analyzer; 11. Fixed barrel; 12. Pole; 121. First rod body; 122. Second rod body; 123. Third rod body; 124. Fourth rod body; 13. Connecting column; 14. Fixing glue; 20. Assembly device of the quadrupole mass analyzer; 21. Base; 210. Connecting plate; 2101. Receiving table; 211. Installation end; 2110. Installation groove; 2111. Contact surface; 2112. Abutting surface; 2113. Rotating hole; 2115. Installation hole; 2116. Fixing hole; 22. Micrometer head; 221. First micrometer head; 222. Second micrometer head; 223. Third micrometer head; 224. Fourth micrometer head; 225. Fifth micrometer head; 23. Fastener; 24. Tensioning member; 25. Mounting member. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] Figures 1 to 2 For the quadrupole mass analyzer 10 to be assembled in this application, the quadrupole mass analyzer 10 includes a fixing barrel 11, poles 12, connecting columns 13 and fixing glue 14. The number of poles 12 is four, namely a first rod body 121, a second rod body 122, a third rod body 123 and a fourth rod body 124. The four poles 12 are received in the fixing barrel 11, the connecting columns 13 are installed on the fixing barrel 11 and cooperate with the poles 12, and the fixing glue 14 fixes the connecting columns 13 to the fixing barrel 11.

[0038] Please continue to refer to Figures 3 to 6 , for the assembling device 20 of the quadrupole mass analyzer of this application. The assembling device 20 of the quadrupole mass analyzer includes a base 21, a micrometer head 22, a fastener 23, a tensioning member 24 and a mounting member 25.

[0039] The base 21 includes a connecting plate 210 and two mounting ends 211. The two mounting ends 211 extend from both ends of the connecting plate 210 and are perpendicular to the connecting plate 210.

[0040] The connecting plate 210 is provided with a receiving platform 2101, and the receiving platform 2101 is used to receive the fixing barrel 11.

[0041] Each mounting end 211 is provided with a mounting groove 2110, a rotation hole 2113, a mounting hole 2115, and a fixing hole 2116. The mounting groove 2110 is generally rectangular and is located at the upper end of the mounting end 211. The mounting groove 2110 includes a contact surface 2111 and an abutting surface 2112. The contact surface 2111 is located at the bottom of the mounting groove 2110, and the abutting surface 2112 is located on the side of the contact surface 2111 and is perpendicular to the contact surface 2111. The abutting surface 2112 protrudes from the mounting groove 2110, making one corner of the mounting groove 2110 a convex structure. The flatness and coplanarity of the contact surfaces 2111 of the two mounting ends 211 are both within 1 μm. The rotation holes 2113 are provided on three side walls of the mounting groove 2110. The rotation holes 2113 are used for mounting the differential heads 22. The differential heads 22 are rotatably mounted in the rotation holes 2113 and extend into the mounting groove 2110. The number of mounting holes 2115 corresponds to that of the rotation holes 2113, and the mounting holes 2115 are used for mounting the fasteners 23. The number of fixing holes 2116 is four, which are respectively provided at the four corners of the mounting groove 2110. The fixing holes 2116 are used for mounting four mounting members 25.

[0042] The differential head 22 is rotatably mounted in the rotation hole 2113 and extends into the mounting groove 2110. The end of the differential head 22 abuts against the pole 12. By adjusting the length of the differential head 22 extending into the mounting groove 2110, the position of the pole 12 is adjusted. Five differential heads 22 are mounted on each mounting end 211. The five differential heads 22 are respectively: two differential heads 22 are mounted on one side of the mounting groove 2110, two differential heads 22 are mounted on the top of the mounting groove 2110, and one differential head 22 is mounted on the other side of the mounting groove 2110. The differential head 22 is a commonly used differential head on the market. After being assembled to the base 21, the theoretical position of its contact surface with the nearest pole 12 should have an axial adjustable amount of ±2 mm by itself.

[0043] The fastener 23 is mounted in the mounting hole 2115 and abuts against the differential head 22, locking the differential head 22 to the mounting end 211. Specifically, the fastener 23 is a set screw.

[0044] The tensioning member 24 is one of a flexible belt or a spring. The tensioning member 24 makes the pole 12 and the mounting end 211 be in a floating connection. When the tensioning member 24 is a flexible belt, one end of each tensioning member 24 is sleeved on the mounting member 25, and the mounting member 25 is fixed to the mounting end 211. The other end of each tensioning member 24 is sleeved on the end of the pole 12. When the tensioning member 24 is a spring, one end of the spring is fixed to the mounting end 211, and the other end cooperates with the end of the pole 12 to apply a pulling force towards the edge of the mounting groove 2110 to the end of the pole 12. The tension value of the tensioning member 24 should satisfy being greater than the sum of the gravity of each pole 12 and the measuring force of subsequent measuring instruments (such as length gauges, inductive micrometers, optical length comparators, etc.) times. The tension of the tensioning member 24 should be as small as possible under the condition of meeting the above conditions.

[0045] The mounting member 25 is mounted in the mounting hole 2115. The mounting member 25 is used to mount the tension member 24. Specifically, the mounting member 25 is a strap screw.

[0046] Please continue to refer to Figure 7 and Figure 8 When using the assembling device 20 of the quadrupole mass analyzer, it is necessary to know the main design dimensions of the quadrupole mass analyzer 10 to be assembled, that is, the field circle radius r0 of the quadrupole mass analyzer 10 and the radius r of the pole. Then, the required assembling measurement dimensions are deduced through geometric relations. As Figure 7 shown, the centers of the first rod body 121, the second rod body 122, the fourth rod body 124, and the third rod body 123 are A, B, C, and D respectively. By the field circle radius r0 and the pole radius r, the theoretical values of the outer dimensions of adjacent rods and the outer dimensions of opposite rods are solved.

[0047]

[0048] L23 = 2r0 + 4r (2)

[0049] Taking the pole with a diameter of 9.4 mm commonly used in the quadrupole mass analyzer 10 of the liquid chromatography - mass spectrometry triple quadrupole mass spectrometer as an example for detailed description. For a pole with a diameter of 9.4 mm, the pole radius is 4.7 mm. Generally, the field circle radius is taken as 4.16 mm. In this way

[0050] r / r0 = 4.7 / 4.16 ≈ 1.1298 (3)

[0051] It meets the recommended range of 1.128 - 1.13 for the pole radius and the field circle radius.

[0052] At this time, the theoretical value of the outer dimension of adjacent rods

[0053]

[0054] The theoretical value of the outer dimension of opposite rods

[0055] L23 = 2r0 + 4r = 2×4.16 + 4×4.7 = 27.12 mm (5)

[0056] In the early stage, using common laboratory length measuring devices such as vernier calipers and micrometers, on this device, the quadrupole mass analyzer 10 to be assembled is assembled to within a comprehensive accuracy of 10 μm. This lays a good foundation for further high - precision assembly. The requirements for process personnel for this assembly accuracy are relatively low, and the assembly process will not be elaborated here.

[0057] Next, fine - tuning of the assembly accuracy is carried out to achieve a comprehensive accuracy within 2 μm for the quadrupole mass analyzer. The components involved in the process are shown in Figure 8as shown

[0058] First, adjust one end of this device. Adjust the horizontal position of the second rod body 122 by adjusting the first micrometer head 221 so that it satisfies the actual outer dimension L12' of the first rod body 121

[0059] |L12'-L12|≤0.3μm (6)

[0060] In the above process, it can be achieved by high-precision measuring instruments such as a length gauge, an inductive micrometer or an optical length comparator, etc.

[0061] Then, in a similar manner, adjust the vertical position of the fourth rod body 124 by adjusting the fourth micrometer head 224 so that it satisfies the actual outer dimension L13' of the first rod body 121

[0062] |L13'-L13|≤0.3μm (7)

[0063] At this time, although L12' and L13' are already close to their theoretical values, ∠BAC is not necessarily close to a right angle. Therefore, it is necessary to further measure the outer dimensions of the second rod body 122 and the fourth rod body 124, that is, the rod dimension L23'.

[0064] Furthermore, by adjusting the micrometer head 22 alone, make

[0065] |L23'-L23|≤0.3μm (8)

[0066] It should be noted that only the fifth micrometer head 225 is adjusted alone here, without considering the influence of the adjustment process on L13'. Because it is considered that the overall accuracy within 10μm has been achieved in the previous stage, so the deviation angle between ∠BAC and the right angle

[0067] θ=|∠BAC'-π / 4|≤10μm / L12≈0.00046 (9)

[0068] During the process of adjusting the fifth micrometer head 225 alone, the maximum change range of L13'

[0069] L13(1 - cosθ)=21.9280mm×(1 - cos0.00046)≈0.002μm (10)

[0070] Therefore, it can be considered that L13' remains unchanged.

[0071] After completing the above steps, it can be considered that the first rod body 121, the second rod body 122, and the fourth rod body 124 are all assembled, and they are distributed close enough to an isosceles right triangle.

[0072] Then, following similar steps, adjust the third micrometer head 223 so that the outer dimensions of the second rod body 122 and the third rod body 123

[0073] |L24'-L24|≤0.3μm (11)

[0074] Adjust the second micrometer head 222 so that the outer dimensions of the fourth rod body 124 and the third rod body 123

[0075] |L34'-L34|≤0.3μm (12)

[0076] After completing the above steps, the assembly dimensions at one end of the quadrupole mass analyzer 10 have been adjusted to be qualified. Adjust the other end of the quadrupole mass analyzer 10 following similar steps to meet the high-precision assembly requirements of the quadrupole mass analyzer 10.

[0077] Please continue to refer to Figure 9 , different from the key dimensions shown in the conventional symmetric quadrupole mass analyzer 10 in Figure 7 , for non-standard quadrupoles with different pole diameters, such as Figure 9 shown, this device can still be used for high-precision assembly. The dashed circle represents the pole with an increased diameter dimension, and its center is C1. The difference in the assembly method is that the theoretical value of ∠BAC1 is not a right angle at this time. However, the position calculation and adjustment can still be performed based on the side length and angle relationship of ΔBAC1. In Figure 9 , taking A as the coordinate origin, a coordinate system is established in the x and y directions shown in the figure. Let the theoretical coordinates of C1 be (x C1 , y C1 ). At this time

[0078] L13 = AC1 + r1 + r (13)

[0079] L34 = C1D + r1 + r (14)

[0080] L23 = BC1 + r1 + r (15)

[0081] Based on the measured values L13' and L34', calculate the actual coordinates of C1' as (x C1 ', y C1 ')

[0082] According to the measured outer dimensions L13' and L23' of the adjacent rod and the opposite rod along the center line of the circle, we can obtain

[0083] AC1' = L13' - r1 - r (15)

[0084] BC1' = L23' - r1 - r (16)

[0085] ∠BAC1' = arccos[(AB'2 +AC1' 2 -BC1' 2 ) / 2AB'*AC1'] (17)

[0086] Then it can be known that

[0087] x C1 ' = -AC1' * cos∠BAC1' (18)

[0088] y C1 ' = AC1' * sin∠BAC1' (19)

[0089] By comparing the theoretical value and the measured value of the C1 coordinates, the required adjustment amount is obtained. By adjusting the two differential heads 22 of the pole where C1 is located, C1 is adjusted to the designed coordinate value. The remaining process will not be elaborated.

[0090] It can be expected that by appropriately adjusting the size of the differential head and combining with high-precision measurement means, both the conventional and special-shaped quadrupole mass analyzers can finally converge to the designed assembly position and obtain the final high-precision assembly index. At present, the assembly device 20 of the quadrupole mass analyzer of the present application has been used for the assembly of the quadrupole mass analyzer 10 of the enterprise, and products with a comprehensive accuracy better than 2 μm have been realized. Moreover, if continuous exploration is carried out on the adjustment link, it is expected that an extremely high assembly accuracy within even 1 μm can be obtained.

[0091] This application also relates to an assembly method of a quadrupole mass analyzer implemented by using the above-mentioned assembly device 20 of the quadrupole mass analyzer, including the following steps:

[0092] Rough assembly: Install the quadrupole mass analyzer 10 on the assembly device 20 of the quadrupole mass analyzer, so that the fixed barrel 11 is located on the connecting plate 210 of the base 21, and both ends of the pole 12 are respectively located in the installation grooves 2110 of the installation ends 211. Using a common length measuring device, the quadrupole mass analyzer 10 is assembled to within a comprehensive accuracy of 10 μm;

[0093] Calculate the dimensions: Solve the theoretical values of the outer dimensions of adjacent poles and the outer dimensions of opposite poles through the field circle radius r0 and the pole radius r;

[0094] Adjustment of the assembly accuracy at one end: Adjust the position of one end of the pole 12 in the installation groove 2110 through the differential head 22, so that the error between the actual value and the theoretical value of the outer dimension of the adjacent pole is less than the threshold, and the error between the actual value and the theoretical value of the outer dimension of the opposite pole is less than the threshold;

[0095] Adjustment of the assembly accuracy at the other end: Adjust the position of the other end of the pole 12 in the installation groove 2110 through the differential head 22, so that the error between the actual value and the theoretical value of the outer dimension of the adjacent pole is less than the threshold, and the error between the actual value and the theoretical value of the outer dimension of the opposite pole is less than the threshold.

[0096] Further, the assembly method of the quadrupole mass analyzer further includes a fixing step, and specifically, the fixing step is: adjusting the connecting column 13 according to the adjusted position of the pole 12, and fixing the connecting column 13 and the fixing barrel 11 with the fixing glue 14.

[0097] The assembly device 20 of the quadrupole mass analyzer does not require high-precision parts such as right angles and cylindrical surfaces that are difficult to machine. The only part with high-precision requirements is the contact surface 2111 of the base 21, which is convenient for tooling processing. Other required parts are only conventional commodities such as the differential head 22, screws, and belts. The implementation difficulty of this assembly device is greatly reduced compared with the prior art. This assembly device and method are expected to greatly reduce the assembly threshold of the quadrupole mass analyzer 10. In terms of detection, it is detected according to the detection method of the quadrupole mass analyzer 10 in the conventional standard, without additional high-precision detection requirements. In addition, the assembly device 20 of this quadrupole mass analyzer has adjustable links and can be used to assemble special quadrupole configurations with asymmetric four poles, having excellent adaptability.

[0098] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made. These are all equivalent modifications and evolutions of the above embodiments based on the essential technology of the present invention, and all belong to the protection scope of the present invention.

Claims

1. An assembly device for a quadrupole mass analyzer, which is used to assemble a quadrupole mass analyzer, and is characterized in that: The assembly device of the quadrupole mass analyzer includes a base, a plurality of differential heads and a plurality of tensioning members. The base includes a connecting plate and mounting ends located at both ends of the connecting plate. The connecting plate receives the fixed barrel of the quadrupole mass analyzer. The two mounting ends receive the two ends of the pole of the quadrupole mass analyzer respectively. Each mounting end is provided with a mounting groove. The pole end is located in the mounting groove. The tensioning member is installed at the mounting end and cooperates with the pole so that each pole is tightened. The tensioning member is a flexible belt or a spring. The differential head is rotatably installed at the mounting end and extends into the mounting groove. The end of the differential head abuts against the pole so that the pole moves in the mounting groove to adjust the relative position between the four poles. The assembly device of the quadrupole mass analyzer also includes fasteners. The number of the fasteners is the same as the number of the differential heads. The fasteners are installed at the mounting end and abut against the differential head so that the differential head is locked with the mounting end.

2. The assembling device of the quadrupole mass analyzer according to claim 1, characterized in that: When the tensioning member is a flexible belt, the assembly device of the quadrupole mass analyzer further comprises a mounting member, the mounting member is fixed to the mounting end, and two ends of the tensioning member are respectively sleeved on the mounting member and the pole.

3. The assembling device of the quadrupole mass analyzer according to claim 1, wherein: When the tensioning member is a spring, two ends of the spring are respectively connected to the mounting end and the pole, and the spring provides tension for the pole.

4. The assembly device of the quadrupole mass analyzer according to claim 1, characterized in that: The mounting groove is provided with a contact surface, and the contact surface abuts against the side wall of the two poles. The flatness and coplanarity of the contact surfaces of the two mounting ends are both within 1 μm.

5. The assembling device of the quadrupole mass analyzer according to claim 4, characterized in that: The mounting groove is provided with a supporting surface, the supporting surface is perpendicular to the contact surface and is located on one side of the contact surface, the supporting surface abuts against a side wall of a pole, and the supporting surface and the contact surface position a pole.

6. The assembling device of the quadrupole mass analyzer according to claim 5, characterized in that: The number of the differential heads at each mounting end is 5, the positions of the two poles are adjusted by the two differential heads respectively, and the side wall of the other pole contacts the contact surface and is adjusted by one differential head.

7. A method for assembling a quadrupole mass analyzer implemented by an assembly device of the quadrupole mass analyzer according to any one of claims 1-6, characterized in that, The following steps are involved: Rough assembly: install the quadrupole mass analyzer on the assembly device of the quadrupole mass analyzer, so that the fixed barrel is located on the connecting plate of the base, and the two ends of the pole are respectively located in the mounting grooves of the mounting end. Use a common length measuring device to assemble the quadrupole mass analyzer to a comprehensive accuracy of less than 10μm; Calculate the size: By using the field circle radius r0 and the pole radius r, solve the theoretical values of the adjacent pole and opposite pole external dimensions; One-end assembly accuracy adjustment: adjust the position of one end of each pole in the installation slot through the differential head, so that the error between the actual value and the theoretical value of the adjacent pole's external measurement size is less than the threshold value, and the error between the actual value and the theoretical value of the opposite pole's external measurement size is less than the threshold value; Adjustment of the assembly accuracy at the other end: adjust the position of the other end of each pole in the mounting slot through the differential head so that the error between the actual value and the theoretical value of the outer dimension of the adjacent pole is less than the threshold value, and the error between the actual value and the theoretical value of the outer dimension of the opposite pole is less than the threshold value.

8. The method for assembling a quadrupole mass analyzer according to claim 7, wherein: The method further comprises a fixing step, which specifically comprises: adjusting the connecting column according to the adjusted position of the pole, and fixing the connecting column to the fixing barrel by means of fixing glue.

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