Mass analyzer and quadrupole mass spectrometer

Abstract

The invention relates to a mass analyzer and a quadrupole mass spectrometer, and belongs to the technical field of mass analyzers, the mass analyzer comprises a supporting unit, a connecting unit, a measuring unit, a clamping unit, an adjusting unit and a driving unit; the supporting unit comprises a base, a plurality of supporting seats which are arranged on the base, and a plurality of lifting assemblies which are arranged on the supporting seats in a sliding manner; the connecting unit is rotationally arranged on the lifting assembly; the measuring unit is arranged on the connecting unit; the clamping unit is arranged on the connecting unit and abuts against the measuring unit. The adjusting unit is arranged on the supporting seat and the output end is connected with the lifting assembly; the driving unit is arranged on the supporting seat and is in driving connection with the adjusting unit. According to the invention, the electrode stem can be quickly disassembled and assembled and can be adjusted in the horizontal and vertical directions.

Description

Technical Field

[0001] The present invention relates to the technical field of mass analyzers, and particularly to a mass analyzer and a quadrupole mass spectrometer. Background Art

[0002] As an important tool in the field of material analysis, the performance of the core component, the mass analyzer, of a quadrupole mass spectrometer directly affects the detection accuracy and stability. In existing quadrupole mass spectrometers, the installation and adjustment of electrode rods generally have the following technical bottlenecks: The electrode rods mostly adopt a fixed connection structure. During the installation process, the concentricity needs to be repeatedly adjusted. The operation is cumbersome and it is difficult to ensure the symmetry of multiple electrode rods, which easily leads to uneven electric field distribution and affects the mass analysis accuracy.

[0003] Chinese Patent Publication No. CN217108989U discloses a fixing device for a mass analyzer of a mass spectrometer, including: a support member, the top of the support member has a support cavity, the support cavity is adapted to the bottom of the seat body of the mass analyzer, and the cavity wall of the support cavity is used to support the seat body; a chassis, the chassis is provided with an adjustment hole for cooperating with the support member, a part of the support member is located in the adjustment hole, and the support member is connected to the adjustment hole in a vertically adjustable manner; a locking member, the locking member is used to lock the seat body in the support cavity. In the present invention, if it is necessary to increase the height of the mass analyzer, then the support member is moved upward. After moving to a suitable position, the support member is connected to the adjustment hole. If it is necessary to decrease the height of the mass analyzer, then first disconnect the connection between the support member and the adjustment hole, then move the support member downward. After moving to a suitable position, the support member is connected to the adjustment hole again. After the position of the mass analyzer is appropriate, the seat body is locked in the support cavity through the locking member.

[0004] However, the above technical solution only supports the position adjustment in a single horizontal or vertical direction, and in the prior art, multiple sets of independent drive systems are required to achieve compound displacement, resulting in a complex structure and low adjustment efficiency. In addition, the disassembly and maintenance of the electrode rods require the overall disassembly of the support structure, and the replacement takes a long time. Especially when replacing vulnerable components such as a collision reaction cell, the maintenance cost increases significantly. Summary of the Invention

[0005] The object of the present invention is to address the problems in the background art and propose a mass analyzer that can quickly disassemble and assemble electrode rods and can perform horizontal and vertical direction adjustments.

[0006] The technical solution of the present invention: A mass analyzer includes a support unit, including a base, a plurality of support seats all arranged on the base, and a plurality of lifting components all slidably arranged on the support seats; a connection unit, rotatably arranged on the lifting component; A measuring unit, arranged on the connecting unit, generates a quadrupole electric field by applying a combination of a DC voltage and a radio frequency AC voltage, and is used to screen ions of a specific mass according to the mass-to-charge ratio while filtering other ions; A clamping unit, arranged on the connecting unit and abutted against the measuring unit; An adjusting unit, arranged on the support base and with its output end connected to the lifting assembly; and, A driving unit, arranged on the support base and drivingly connected to the adjusting unit.

[0007] Preferably, the connecting unit includes a fixed seat having four fixing grooves and rotatably arranged on the lifting assembly, four connecting blocks detachably connected to the fixed seat, and a clamping block arranged on the connecting block and slidably arranged on the fixed seat and clamped; the fixed seat cooperates with the connecting block to be clamped with the measuring unit; an anti-disengagement unit for clamping with the connecting block is arranged on the fixed seat.

[0008] Preferably, the measuring unit includes four electrode rods respectively arranged at the fixing grooves and a collision reaction cell arranged on the electrode rods; the connecting block is slidably connected and clamped with the electrode rods.

[0009] Preferably, the anti-disengagement unit includes a clamping disc rotatably arranged on the fixed seat, a connecting sleeve threadedly connected to the fixed seat and clamped and slidably connected to the clamping disc, and a first elastic member arranged on the fixed seat and abutted against the clamping disc; the clamping disc is located at the clamping block and is clamped with the clamping block and abutted against the electrode rod.

[0010] Preferably, a bolt hole is arranged on the connecting block, and the clamping unit includes a pressing column embedded and slidably arranged in the bolt hole, a second elastic member arranged in the bolt hole and abutted against the pressing column, and a counter-bolt threadedly connected to the connecting block and abutted against the pressing column; the lower end of the pressing column is in an arc structure and abuts against the outer surface of the electrode rod.

[0011] Preferably, the adjusting unit includes a guide rail arranged on the support base, a lead screw group rotatably arranged on the support base, two sliding blocks slidably arranged on the guide rail, and a plurality of connecting rods with both ends respectively rotatably connected to the sliding blocks and the lifting assembly; the lead screw group includes a first lead screw and a second lead screw; when one of the sliding blocks is threadedly connected to the first lead screw, it has a clearance fit with the second lead screw, and the other sliding block is threadedly connected to the second lead screw and has a clearance fit with the first lead screw.

[0012] Preferably, the driving unit includes a handle slidably disposed on the second threaded rod, a relative rotation gear set disposed on the handle and having an output end connected to the first threaded rod, a same-direction rotation gear set disposed on the handle and having an output end connected to the first threaded rod and distributed in a staggered manner with respect to the relative rotation gear set, and an elastic member disposed on the outer peripheral side of the handle and connected to the relative rotation gear set; a protective shell is disposed outside the relative rotation gear set and the same-direction rotation gear set; the elastic member abuts against the protective shell.

[0013] Preferably, the relative rotation gear set includes a first driving gear disposed on the handle, and a first driven gear disposed on the first threaded rod and meshed with the first driving gear; The same-direction rotation gear set includes a second driving gear disposed on the handle, a reversing gear rotatably disposed on the mounting shell and meshed with the second driving gear, and a second driven gear disposed on the first threaded rod and meshed with the reversing gear; there is a gap between the first driven gear and the second driven gear, and the thickness of the gap is less than or equal to the thickness of the first driven gear.

[0014] Preferably, the lifting assembly includes a lifting seat rotatably connected to the connecting rod, and a rotating seat disposed on the lifting seat and rotatably connected to the fixed seat; positioning magnets magnetically connected are disposed on both the rotating seat and the fixed seat.

[0015] A quadrupole mass spectrometer includes the above-mentioned mass analyzer, and further includes an ion source disposed at the inlet end of the mass analyzer for generating charged ions to be analyzed; a detector disposed at the outlet end of the mass analyzer for detecting ions passing through the mass analyzer and converting them into electrical signals; a vacuum system connected to the mass analyzer for providing a low-pressure environment for the movement of ions; and a power control system electrically connected to the ion source, the mass analyzer and the detector for providing the working voltages required for each part and controlling the working process of the entire mass spectrometer.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: In the present invention, the connecting unit is installed on the lifting assembly, and the measuring unit is installed on the connecting unit, so that the measuring unit can be clamped on the connecting unit. Through the structure of the connecting block, the measuring unit can be quickly installed and quickly disassembled and replaced; After the electrode rod is installed, the driving unit drives the adjusting unit to move, and the adjusting unit drives the lifting assembly to move, so that the lifting assembly can drive the connecting unit to move horizontally or vertically, thereby enabling the position of the connecting unit to be adjusted, and then the position of the lifting assembly can be adjusted, and the concentricity of the connecting unit can be adjusted, thus facilitating the detection. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0018] Figure 1 Structural schematic diagram of the embodiment in the present invention; Figure 2 Exploded structural view of the embodiment in the present invention; Figure 3 For Figure 2 Partial enlarged structural schematic diagram of part A in Figure 4 For Figure 2 Partial enlarged structural schematic diagram of part B in Figure 5 Partial structural schematic diagram of the embodiment in the present invention; Figure 6 Partial exploded structural view of the embodiment in the present invention.

[0019] Reference numerals: 1, support unit; 101, base; 102, support seat; 103, lifting assembly; 1031, lifting seat; 1032, rotating seat; 2, connecting unit; 201, fixed seat; 202, connecting block; 203, clamping block; 2011, fixed groove; 3, measuring unit; 301, electrode rod; 302, collision reaction cell; 4, anti-disengagement unit; 401, clamping disc; 402, connecting sleeve; 403, first elastic member; 5, clamping unit; 501, abutting bolt; 502, pressing column; 503, second elastic member; 6, adjusting unit; 601, guide rail; 602, lead screw group; 603, sliding block; 604, connecting rod; 6021, first threaded rod; 6022, second threaded rod; 7, driving unit; 701, handle; 702, elastic member; 703, relative rotation gear set; 704, same-direction rotation gear set. Detailed Embodiments

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the drawings of the specification.

[0021] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0022] Secondly, as used herein, an "embodiment" or "embodiments" refer to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive of other embodiments individually or selectively.

[0023] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views showing the device structure are enlarged locally in a non-generalized scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0024] Embodiment 1: As Figures 1-6 shown, a mass analyzer proposed by the present invention includes a support unit 1, a connection unit 2, a measurement unit 3, a clamping unit 5, an adjustment unit 6, and a driving unit 7; The support unit 1 includes a base 101, a plurality of support seats 102 all provided on the base 101, and a plurality of lifting assemblies 103 all slidably provided on the support seats 102; the connection unit 2 is rotatably provided on the lifting assembly 103; the measurement unit 3 is provided on the connection unit 2 and generates a quadrupole electric field by applying a combination of a DC voltage and a radio frequency AC voltage, and is used to screen ions of a specific mass according to the mass-to-charge ratio and filter other ions; the clamping unit 5 is provided on the connection unit 2 and abuts against the measurement unit 3; the adjustment unit 6 is provided on the support seat 102 and its output end is connected to the lifting assembly 103; the driving unit 7 is provided on the support seat 102 and is drivingly connected to the adjustment unit 6. The lifting assembly 103 includes a lifting seat 1031 rotatably connected to a connecting rod 604, and a rotating seat 1032 provided on the lifting seat 1031 and rotatably connected to a fixed seat 201; positioning magnets magnetically connected are provided on both the rotating seat 1032 and the fixed seat 201; the rotating seat 1032 can be connected to the fixed seat 201, and by a plurality of positioning magnets evenly distributed on the outer side of the fixed seat 201, when rotated by a certain angle, the two magnets can be magnetically connected, thereby relatively fixing the fixed seat 201 to prevent the fixed seat 201 from rotating during use.

[0025] The measuring unit 3 includes electrode rods 301 which are four in number and are respectively arranged at the fixed slots 2011, and a collision reaction cell 302 arranged on the electrode rods 301; the connecting block 202 is slidably connected and clamped with the electrode rods 301; the electrode rods 301 are respectively connected to the positive electrode and the negative electrode, so as to be able to perform mass analysis on substances, and the detection accuracy is increased through the collision reaction cell 302.

[0026] In this embodiment, the connecting unit 2 is installed on the lifting assembly 103, and the measuring unit 3 is installed on the connecting unit 2, so that the measuring unit 3 can be clamped on the connecting unit 2. Through the structure of the connecting block 202, the measuring unit 3 can be quickly installed and quickly disassembled and replaced. After the electrode rods 301 are installed, the driving unit 7 drives the adjusting unit 6 to move, and the adjusting unit 6 drives the lifting assembly 103 to move, so that the lifting assembly 103 can drive the connecting unit 2 to move horizontally or vertically, so as to be able to adjust the position of the connecting unit 2, so as to be able to adjust the position of the lifting assembly 103, and the concentricity of the connecting unit 2 can be adjusted, so as to facilitate detection.

[0027] Embodiment 2: As Figures 1-6 shown, a mass analyzer proposed by the present invention. Compared with Embodiment 1, in this embodiment, the connecting unit 2 includes a fixed seat 201 which has four fixed slots 2011 and is rotatably arranged on the lifting assembly 103, four connecting blocks 202 which are detachably connected to the fixed seat 201, and a clamping block 203 which is arranged on the connecting block 202 and is slidably arranged on the fixed seat 201 and is clamped; the fixed seat 201 cooperates with the connecting block 202 to clamp the measuring unit 3; an anti-disengagement unit 4 is arranged on the fixed seat 201 for clamping the connecting block 202. The anti-disengagement unit 4 includes a clamping disc 401 rotatably arranged on the fixed seat 201, a connecting sleeve 402 which is threadedly connected to the fixed seat 201 and is clamped and slidably connected to the clamping disc 401, and an elastic member 403 arranged on the fixed seat 201 and abutted against the clamping disc 401; the clamping disc 401 is located at the clamping block 203 and is clamped with the clamping block 203 and abutted against the electrode rod 301.

[0028] In this embodiment, when installing the electrode rod 301, rotate the clamping disc 401 to separate the clamping disc 401 from the clamping block 203, avoiding blocking the clamping block 203, so that the connecting block 202 can be removed from the fixed seat 201, exposing the fixing groove 2011. Thus, it is convenient to directly place the electrode rod 301 on the fixed seat 201. Then align the clamping block 203 with the fixed seat 201 and insert it into the fixed seat 201, so that the connecting block 202 is located at the fixing groove 2011 and presses on the electrode rod 301. Release the clamping disc 401, and the first elastic member 403 pushes the clamping disc 401 to rotate, so that the clamping disc 401 seals the clamping block 203 and the connecting block 202, preventing the clamping block 203 from falling off the fixed seat 201. The connecting sleeve 402 is used to relatively fix the clamping disc 401 to prevent the clamping disc 401 from falling off the fixed seat 201 when rotating. A hollow convex tube for installing the clamping disc 401 and the connecting sleeve 402 is provided at the middle position of the fixed seat 201.

[0029] Embodiment Three: As Figures 1-6 shown, a mass analyzer proposed by the present invention. Compared with Embodiment One or Embodiment Two, in this embodiment, a bolt hole is provided on the connecting block 202. The clamping unit 5 includes a pressing column 502 embedded and slidably arranged in the bolt hole, a second elastic member 503 arranged in the bolt hole and abutted against the pressing column 502, and a counter-bolt 501 threadedly connected to the connecting block 202 and abutted against the pressing column 502. The lower end of the pressing column 502 is in an arc structure and abuts against the outer surface of the electrode rod 301.

[0030] In this embodiment, the pressing column 502 is inserted into the bolt hole, and the sliding block 603 is sleeved on the pressing column 502. At this time, under the elastic force of the second elastic member 503, the pressing column 502 does not protrude from the connecting block 202, so as to prevent jamming when installing the connecting block 202. After the connecting block 202 is installed on the fixed seat 201 and the electrode rod 301 is installed, screw in the counter-bolt 501. The counter-bolt 501 pushes the pressing column 502 to move downward, so that the pressing column 502 presses on the electrode rod 301 to fix the electrode rod 301. At the same time, the reaction force generated by the counter-bolt 501 cooperating with the electrode rod 301 makes the connecting block 202 abut against the fixed seat 201, ensuring the reliability of the connection between the connecting block 202 and the connecting block 202 and preventing loosening, so as to fix the electrode rod 301.

[0031] When the counter-bolt 501 is loosened, the second elastic member 503 pushes the pressing column 502 to separate from the electrode rod 301, so as to avoid the pressing column 502 getting stuck on the electrode rod 301 during disassembly, thus facilitating the disassembly and assembly operations.

[0032] Embodiment Four: AsFigures 1-6 As shown in Figures 1-6 , a mass analyzer proposed by the present invention, compared with Embodiment 1 or Embodiment 2 or Embodiment 3, in this embodiment, the adjusting unit 6 includes a guide rail 601 arranged on the support base 102, a lead screw group 602 rotatably arranged on the support base 102, two sliding blocks 603 slidably arranged on the guide rail 601, and a plurality of connecting rods 604 with both ends respectively rotatably connected to the sliding blocks 603 and the lifting assembly 103; the lead screw group 602 includes a first lead screw 6021 and a second lead screw 6022; when one of the sliding blocks 603 is threadedly connected to the first lead screw 6021, it has a clearance fit with the second lead screw 6022, and the other sliding block 603 is threadedly connected to the second lead screw 6022 and has a clearance fit with the first lead screw 6021.

[0033] Furthermore, the driving unit 7 includes a handle 701 slidably arranged on the second lead screw 6022, a relative rotation gear set 703 arranged on the handle 701 with its output end connected to the first lead screw 6021, a co-rotation gear set 704 arranged on the handle 701 with its output end connected to the first lead screw 6021 and misaligned with the relative rotation gear set 703, and an elastic member 702 arranged on the outer peripheral side of the handle 701 and connected to the relative rotation gear set 703; a protective shell is arranged outside the relative rotation gear set 703 and the co-rotation gear set 704; the elastic member 702 abuts against the protective shell, and the driving unit 7 is used to drive the lifting assembly 103 to translate or move up and down through the adjusting unit 6.

[0034] The relative rotation gear set 703 includes a first driving gear arranged on the handle 701, and a first driven gear arranged on the first lead screw 6021 and meshed with the first driving gear; The co-rotation gear set 704 includes a second driving gear arranged on the handle 701, a reversing gear rotatably arranged on the mounting shell and meshed with the second driving gear, and a second driven gear arranged on the first lead screw 6021 and meshed with the reversing gear. There is a gap between the first driven gear and the second driven gear, and the thickness of the gap is less than or equal to the thickness of the first driven gear. By making the gap smaller than the thickness of the first driven gear, when switching the motion mode, the second driving gear can be directly and synchronously engaged with the reversing gear when the first driving gear is separated from the first driven gear, thus avoiding the problem of meshing misalignment.

[0035] In this embodiment, the elastic member 702 is used to push the first driving gear to move, so that the first driving gear drives the handle 701 to move, and the handle 701 drives the second driving gear to move. As a result, under normal circumstances, the co-rotating gear set 704 is in a working state, while the counter-rotating gear set 703 is in a disengaged state. At this time, rotating the handle 701 will drive the second threaded rod 6022 to rotate, and at the same time drive the reversing gear to rotate through the second driving gear, thereby driving the second driven gear and the first threaded rod 6021 to rotate, so that the rotation directions of the first threaded rod 6021 and the second threaded rod 6022 are the same, and they rotate clockwise or counterclockwise at the same time. At this time, the two sliding blocks 603 slide synchronously, so as to drive the lifting assembly 103 to translate left and right without adjusting the height of the lifting assembly 103, thereby being able to adjust the horizontal position of the lifting assembly 103, and then being able to adjust the position of the connecting unit 2, and further adjusting the position of the measuring unit 3, which can conveniently adjust the position in the horizontal direction.

[0036] When the handle 701 is pulled outwards, the handle 701 drives the first driving gear and the second driving gear to move, so that the first driving gear approaches the first driven gear and the second driving gear gradually separates from the reversing gear. As a result, when the second driving gear separates from the reversing gear, the first driving gear can mesh with the second driving gear to ensure the smoothness of meshing. At this time, the counter-rotating gear set 703 is in a working state and the co-rotating gear set 704 is in a failure state. If the handle 701 is rotated, the handle 701 will drive the first driving gear to rotate, and the first driving gear drives the first driven gear to rotate. At this time, the first driving gear and the first driven gear will rotate in opposite directions (one clockwise and one counterclockwise), so as to drive the first threaded rod 6021 and the second threaded rod 6022 to rotate, thereby being able to drive the counter-rotating gear set 703 to approach or move away, drive the co-rotating gear set 704 to move, and thus be able to adjust the height position of the lifting assembly 103, and can adjust the height of the connecting unit 2 according to the installation requirements.

[0037] Embodiment Five: A quadrupole mass spectrometer, comprising the mass analyzer in Embodiment Four, further comprising an ion source, disposed at the inlet end of the mass analyzer, for generating charged ions to be analyzed; A detector, disposed at the outlet end of the mass analyzer, for detecting ions passing through the mass analyzer and converting them into electrical signals; A vacuum system, connected to the mass analyzer, for providing a low-pressure environment for the movement of ions; and A power control system, electrically connected to the ion source, the mass analyzer and the detector, for providing the working voltages required for each part and controlling the working process of the entire mass spectrometer.

[0038] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A mass analyzer, characterized in that: include, A support unit (1) comprising a base (101), a plurality of support seats (102) all arranged on the base (101), and a plurality of lifting assemblies (103) all slidably arranged on the support seats (102); A connecting unit (2) rotatably disposed on the lifting assembly (103); A measuring unit (3) is arranged on the connecting unit (2), and generates a quadrupole electric field by applying a combination of a direct current voltage and a radio frequency alternating current voltage, so as to screen ions of a specific mass according to a mass-to-charge ratio and filter out other ions; A clamping unit (5) arranged on the connecting unit (2) and abutting against the measuring unit (3); an adjusting unit (6), arranged on the supporting base (102) and having an output end connected to the lifting assembly (103); and A driving unit (7) is arranged on the support seat (102) and is drivingly connected to the adjusting unit (6).

2. A mass analyzer according to claim 1, characterized in that: The connection unit (2) comprises a fixing seat (201) having four fixing grooves (2011) and rotatably arranged on the lifting assembly (103), four connecting blocks (202) provided and detachably connected to the fixing seat (201), and a clamping block (203) provided on the connecting block (202) and slidably arranged on the fixing seat (201) and clamped; the fixing seat (201) cooperates with the connecting block (202) to be clamped with the measuring unit (3); and an anti-drop unit (4) is provided on the fixing seat (201) and is clamped with the connecting block (202).

3. A mass analyzer according to claim 2, characterized in that: The measuring unit (3) comprises four electrode rods (301) respectively arranged at the fixing grooves (2011), and a collision reaction pool (302) arranged on the electrode rods (301); the connecting block (202) is slidably connected and snap-fitted to the electrode rods (301).

4. A mass analyzer according to claim 3, characterized in that: The anti-drop unit (4) comprises a clamping disc (401) rotatably arranged on the fixing seat (201), a connecting sleeve (402) threadedly connected to the fixing seat (201) and clamped and slidably connected to the clamping disc (401), and an elastic member (403) arranged on the fixing seat (201) and abutting against the clamping disc (401); the clamping disc (401) is located at the clamping block (203) and clamped with the clamping block (203) and abutting against the electrode rod (301).

5. A mass analyzer according to claim 4, characterized in that: The connection block (202) is provided with a bolt hole, and the clamping unit (5) comprises a clamping column (502) embedded in and slidably arranged in the bolt hole, a second elastic member (503) arranged in the bolt hole and abutting against the clamping column (502), and an abutting bolt (501) threadedly connected to the connection block (202) and abutting against the clamping column (502); the lower end of the clamping column (502) is in an arc-shaped structure and abuts against the outer surface of the electrode rod (301).

6. A mass analyzer according to claim 5, characterized in that: The adjusting unit (6) comprises a guide rail (601) arranged on the support seat (102), a screw rod group (602) rotatably arranged on the support seat (102), two sliding blocks (603) slidably arranged on the guide rail (601), and a plurality of connecting rods (604) with two ends respectively rotatably connected to the sliding blocks (603) and the lifting assembly (103); the screw rod group (602) comprises a first threaded rod (6021) and a second threaded rod (6022); when one of the sliding blocks (603) is threadedly connected to the first threaded rod (6021), it is clearance-matched with the second threaded rod (6022), and the other sliding block (603) is threadedly connected to the second threaded rod (6022) and is clearance-matched with the first threaded rod (6021).

7. A mass analyzer according to claim 6, characterized in that: The driving unit (7) comprises a handle (701) slidably arranged on the second threaded rod (6022), a relatively rotating gear set (703) arranged on the handle (701) and having an output end connected to the first threaded rod (6021), a co-rotating gear set (704) arranged on the handle (701) and having an output end connected to the first threaded rod (6021) and staggered with the relatively rotating gear set (703), and an elastic member (702) arranged on the outer peripheral side of the handle (701) and connected to the relatively rotating gear set (703); protective shells are arranged on the outer sides of the relatively rotating gear set (703) and the co-rotating gear set (704), and the elastic member (702) abuts against the protective shell.

8. A mass analyzer according to claim 7, characterized in that: The relatively rotating gear set (703) comprises a first driving gear arranged on the handle (701), and a first driven gear arranged on the first threaded rod (6021) and meshingly connected with the first driving gear; The co-rotating gear set (704) comprises a second driving gear arranged on the handle (701), a reversing gear rotatably arranged on the mounting shell and meshingly connected with the second driving gear, and a second driven gear arranged on the first threaded rod (6021) and meshingly connected with the reversing gear; a gap exists between the first driven gear and the second driven gear, and the thickness of the gap is less than or equal to the thickness of the first driven gear.

9. A mass analyzer according to claim 8, characterized in that: The lifting assembly (103) comprises a lifting seat (1031) rotatably connected to the connecting rod (604) and a rotating seat (1032) disposed on the lifting seat (1031) and rotatably connected to the fixed seat (201); magnetically connected positioning magnets are disposed on both the rotating seat (1032) and the fixed seat (201).

10. A quadrupole mass spectrometer, characterized in that: A mass analyzer comprising any one of claims 1 to 9, further comprising an ion source, arranged at an inlet end of the mass analyzer, for generating charged ions to be analyzed; A detector, arranged at the outlet end of the mass analyzer, for detecting ions passing through the mass analyzer and converting them into electrical signals; A vacuum system, connected to the mass analyzer, for providing a low-pressure environment for the movement of ions; as well as The power supply control system is electrically connected to the ion source, the mass analyzer and the detector, and is used to provide the operating voltage required by each part and control the working process of the entire mass spectrometer.

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