Mass spectrometer high impedance amplifier fast switching device and method

Abstract

The present application relates to the technical field of mass spectrometer signal processing, in particular to a mass spectrometer high resistance amplifier fast switching device and method, which is used to solve the problem that the existing mass spectrometer is complex in operation, time-consuming and may affect the performance of the amplifier during the amplifier replacement process; the device comprises an analysis tube and a plurality of receiving cups arranged in the analysis tube, and further comprises a switching circuit board and a plurality of high resistance amplifier modules, the plurality of high resistance amplifier modules are electrically connected to the switching circuit board, the signal input end of the switching circuit board is electrically connected with the plurality of analysis tubes, and the signal output end is connected with the data acquisition port of the mass spectrometer; the method comprises: using a U-shaped jumper to access a high resistance amplifier module with different resistance values according to ion flow with different abundances; the present application can quickly replace the resistance value without disassembling the amplifier, avoids damage caused by frequent disassembly of the instrument, and ensures the cleanliness of the electrometer cavity.

Description

Technical Field

[0001] This invention relates to the field of mass spectrometer signal processing technology, specifically to a rapid switching device and method for a high-impedance amplifier in a mass spectrometer. Background Technology

[0002] A mass spectrometer is a high-precision, large-scale analytical instrument widely used in elemental analysis, precise determination of isotope abundance, and other fields. In a mass spectrometer, the high-impedance amplifier is a key component for amplifying weak electrical signals. Different combinations of high-impedance amplifiers correspond to ion current signals of different abundances. That is, an isotope ion current of a certain abundance passes through a corresponding high-impedance amplifier, thereby generating a voltage signal suitable for measurement. Higher abundance ions generally require amplifiers with lower impedance, while lower abundance ions require amplifiers with higher impedance for signal amplification.

[0003] Reference Figure 1 Most mass spectrometers use the following signal acquisition and amplification connection method: the receiving cup 2 is installed inside the analysis tube 1. The receiving cup 2 receives the ion flow signal and is connected to one end of the connection terminal 6 on the terminal flange 3 through a wire. The other end of the connection terminal 6 is connected to the input end of the amplifier body 5 inside the electrometer tube 4. The output end of the amplifier body 5 transmits the amplified signal to the data acquisition card.

[0004] However, when measuring isotope samples with significant abundance differences, the existing high-resistivity amplifier in the mass spectrometer needs to be replaced to meet the requirements of high-precision isotope abundance analysis. Typically, the mass spectrometer is first shut down and completely powered off. Then, all screws on the electrometer cylinder's rear cover are removed, and the power and data cables are disconnected. Next, the entire electrometer cylinder is disassembled. The connection between the amplifier and the receiver flange terminals must be disconnected with extreme care. Then, the corresponding high-resistivity amplifier module is disassembled and replaced, and the process is repeated in reverse until the mass spectrometer is fully started. Finally, the high-resistivity amplifier is observed to ensure it functions correctly and the baseline meets requirements. If any problems are found, the disassembly and inspection must be repeated according to the above procedure. The entire operation is complex and time-consuming, severely impacting the instrument's efficiency and flexibility. Furthermore, frequent disassembly and replacement may adversely affect the cleanliness of the electrometer chamber and the amplifier's performance. Summary of the Invention

[0005] This invention provides a device and method for rapid switching of high-impedance amplifiers in a mass spectrometer, to solve the problems of complex operation, long time consumption, and potential impact on amplifier performance during amplifier replacement in existing mass spectrometers.

[0006] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] A rapid switching device for high-resistivity amplifiers in a mass spectrometer includes an analysis tube and multiple receiving cups disposed within the analysis tube. It also includes a switching circuit board and multiple high-resistivity amplifier modules. The multiple high-resistivity amplifier modules are electrically connected to the switching circuit board. The signal input terminal of the switching circuit board is electrically connected to the multiple analysis tubes, and the signal output terminal is connected to the mass spectrometer data acquisition port. The multiple high-resistivity amplifier modules have different resistance values. By switching the on / off state of the multiple high-resistivity amplifier modules, ion current signals of different abundances can be measured.

[0008] Furthermore, the switching circuit board is provided with an amplifier input interface and an amplifier output interface, and the input and output terminals of the high-impedance amplifier module are electrically connected to the amplifier input interface and the amplifier output interface, respectively.

[0009] Furthermore, the switching circuit board is provided with a signal receiving port and a signal output port. The signal receiving port is electrically connected to the receiving cup, and the signal output port is electrically connected to the mass spectrometer data acquisition port.

[0010] Furthermore, the signal receiving port includes five receiving terminals, and the amplifier input interface includes seven input terminals. The five receiving terminals are respectively connected to five of the seven input terminals via U-shaped jumpers.

[0011] Furthermore, the signal output port includes five transmitting terminals, and the amplifier output interface includes seven output terminals. The five transmitting terminals are respectively connected to five of the seven output terminals via the U-shaped jumper.

[0012] Furthermore, an adjustment bracket is installed on the switching circuit board, and five N-shaped brackets are slidably connected to the adjustment bracket. Each end of the N-shaped bracket is slidably connected to a vertically arranged control rod. One end of each of the ten U-shaped jumpers, which is used to connect the amplifier input interface and the amplifier output interface, is fixedly connected to the ten control rods. The vertical sliding of the control rods can drive the U-shaped jumpers to be plugged into / out of the input terminal and the output terminal.

[0013] Furthermore, a gear is rotatably connected to the N-shaped frame, and a rack that meshes with the gear is fixedly connected to the adjusting frame. When the N-shaped frame slides, the gear rolls on the rack. Two pawls are symmetrically hinged to the upper part of the gear inside the N-shaped frame. A spring connects the two pawls to the N-shaped frame, and a camshaft is rotatably connected between the two pawls. The camshaft can rotate forward or backward, thereby driving one of the pawls away from the teeth of the gear, thus changing the direction of the gear's unidirectional rotation.

[0014] Furthermore, an electric rotating rod is rotatably connected inside the N-shaped frame. The output end of the electric rotating rod is fixedly connected to the camshaft. When the voltage input from the current high-impedance amplifier module to the data acquisition card frequently reaches the upper limit, the electric rotating rod rotates in the first direction, so that the gear can only roll in the direction of the input terminal and the output terminal corresponding to the low-impedance high-impedance amplifier module.

[0015] Furthermore, a pressure plate is fixedly connected to the electric rotating rod, and two indicator lights are installed on the N-shaped frame. Two indicator switches corresponding to the two indicator lights are provided at the lower part of the pressure plate. When the electric rotating rod rotates in the first direction, the indicator light near the high-impedance amplifier module with low resistance value lights up.

[0016] A method for rapid switching of high-impedance amplifiers in a mass spectrometer, using a rapid switching device for high-impedance amplifiers in a mass spectrometer, includes the following steps:

[0017] Connect the signal output terminals of the five receiving cups to the signal receiving terminals of the five signal receiving ports. Connect the input and output ports of the high-impedance amplifier module to the amplifier input interface and amplifier output interface, respectively. Connect the signal output port to the mass spectrometer.

[0018] When switching amplifiers, disconnect the power supply of the mass spectrometer, and use a U-shaped jumper to connect the five receiving terminals of the signal receiving port to five of the seven input terminals of the appropriate amplifier input interface. Connect the output terminal of the amplifier output interface corresponding to the input terminal to the transmitting terminal of the signal output port corresponding to the signal receiving port. After the connection is completed, turn the power supply of the mass spectrometer back on, and you can start using the new amplifier for measurement.

[0019] The beneficial effects of this invention are analyzed as follows:

[0020] A rapid switching device for high-resistivity amplifiers in a mass spectrometer includes an analysis tube and multiple receiving cups disposed within the analysis tube. It also includes a switching circuit board and multiple high-resistivity amplifier modules. The multiple high-resistivity amplifier modules are electrically connected to the switching circuit board. The signal input terminal of the switching circuit board is electrically connected to the multiple analysis tubes, and the signal output terminal is connected to the data acquisition port of the mass spectrometer. The multiple high-resistivity amplifier modules have different resistance values. By switching the on / off state of the multiple high-resistivity amplifier modules, it is possible to measure ion current signals of different abundances.

[0021] The signal output terminals of the five receiving cups are connected to a switching circuit board, which is connected to seven high-impedance amplifier modules with different resistance values. By changing the connection between the five receiving cups and five different resistance values ​​of the seven high-impedance amplifier modules, the device can test ion flow signals with different abundances. The resistance value can be quickly changed without removing the amplifier, avoiding damage caused by frequent disassembly of the instrument, while ensuring the cleanliness of the electrometer chamber. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the existing technology;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the high-impedance amplifier module of the present invention;

[0025] Figure 4 This is a schematic diagram of the switching circuit board of the present invention;

[0026] Figure 5 This is a schematic diagram of the U-shaped jumper of the present invention;

[0027] Figure 6 This is a top view of the switching circuit board of the present invention;

[0028] Figure 7 This is a side view of the switching circuit board of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the adjustment frame of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure at the N-shaped frame of the present invention;

[0031] Figure 10 This is a schematic diagram of the gear structure of the present invention.

[0032] In the diagram: 1. Analyzing tube; 2. Receiving cup; 3. Terminal flange; 4. Electrometer cylinder; 5. Amplifier body; 6. Connecting terminal; 100. High-impedance amplifier module; 110. Signal input interface; 120. Signal output interface; 130. High-insulation circuit board; 140. First resistor; 200. Switching circuit board; 2001. Standard microcurrent source module; 2002. Standard microcurrent source adjustment; 2003. Standard microcurrent source switch; 201. Signal receiving port; 2011. First receiving terminal; 20111. Lower receiving terminal; 2012. Second receiving terminal; 2013. Third receiving terminal; 2014. Fourth receiving terminal; 2015. Fifth receiving terminal; 202, Amplifier input interface; 2021, First input terminal; 20211, Lower input terminal; 2022, Second input terminal; 2023, Third input terminal; 2024, Fourth input terminal; 2025, Fifth input terminal; 2026, Sixth input terminal; 2027, Seventh input terminal; 203, Standard microcurrent source output terminal; 2031, First signal terminal; 20311, Lower signal terminal; 2032, Second signal terminal; 2033, Third signal terminal; 2034, Fourth signal terminal; 2035, Fifth signal terminal; 2036, Sixth signal terminal; 2037, Seventh signal terminal ; 204, Standard signal source output; 2041, First signal output terminal; 20411, Lower signal output terminal; 2042, Second signal output terminal; 2043, Third signal output terminal; 2044, Fourth signal output terminal; 2045, Fifth signal output terminal; 2046, Sixth signal output terminal; 2047, Seventh signal output terminal; 205, Second resistor; 206, Amplifier output interface; 2061, First output terminal; 20611, Lower output terminal; 2062, Second output terminal; 2063, Third output terminal; 2064, Fourth output terminal; 2065, Fifth output terminal; 2066, Third... Sixth output terminal; 2067, Seventh output terminal; 207, Signal output port; 2071, First transmitting terminal; 20711, Lower transmitting terminal; 2072, Second transmitting terminal; 2073, Third transmitting terminal; 2074, Fourth transmitting terminal; 2075, Fifth transmitting terminal; 208, Insulating base; 300, U-shaped jumper; 310, Copper pipe; 320, Connector; 400, Adjusting bracket; 410, Rack; 500, N-shaped bracket; 510, Control lever; 520, Gear; 530, Pawl; 540, Spring; 550, Camshaft; 560, Electric rotating rod; 570, Pressure plate; 580, Indicator switch; 590, Indicator light. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Examples, such as Figures 1-10 As shown, a rapid switching device for high-resistivity amplifiers in a mass spectrometer includes an analysis tube 1 and multiple receiving cups 2 disposed within the analysis tube 1. It also includes a switching circuit board 200 and multiple high-resistivity amplifier modules 100. The multiple high-resistivity amplifier modules 100 are electrically connected to the switching circuit board 200. The signal input terminal of the switching circuit board 200 is electrically connected to the multiple analysis tubes 1, and the signal output terminal is connected to the data acquisition port of the mass spectrometer. The multiple high-resistivity amplifier modules 100 have different resistance values. By switching the on / off state of the multiple high-resistivity amplifier modules 100, ion current signals of different abundances can be measured.

[0035] The working mechanism of the fast switching device for high-impedance amplifiers in mass spectrometers provided in this embodiment is as follows:

[0036] The signal output terminals of the five receiving cups 2 are connected to the switching circuit board 200. The switching circuit board 200 is connected to seven high-impedance amplifier modules 100 with different resistance values. By changing the connection between the five receiving cups 2 and five different resistance values ​​of the seven high-impedance amplifier modules 100, the device can test ion flow signals with different abundances. The resistance value can be quickly changed without removing the amplifier, avoiding damage caused by frequent disassembly of the instrument, while ensuring the cleanliness of the electrometer cavity.

[0037] Among the optional methods in this embodiment, the more preferred one is:

[0038] The switching circuit board 200 is provided with an amplifier input interface 202 and an amplifier output interface 206. The input and output terminals of the high-impedance amplifier module 100 are electrically connected to the amplifier input interface 202 and the amplifier output interface 206, respectively.

[0039] The amplifier input interface 202 includes seven lower input terminals 20211, the amplifier output interface 206 includes seven lower output terminals 20611, and the high-impedance amplifier module 100 includes a high-insulation circuit board 130. The high-insulation circuit board 130 is provided with a signal input interface 110, a signal output interface 120, and a first resistor 140. The signal input interface 110 and the signal output interface 120 are respectively connected to a lower input terminal 20211 and a corresponding lower output terminal 20611, thereby connecting to the switching circuit board 200.

[0040] A standard microcurrent source module 2001 is provided on the switching circuit board 200. The standard microcurrent source module 2001 includes a standard signal source output 204, a second resistor 205, a standard microcurrent source adjustment 2002, and a standard microcurrent source switch 2003. The standard signal source output 204 includes an upper first signal output terminal 2041, a second signal output terminal 2042, a third signal output terminal 2043, a fourth signal output terminal 2044, a fifth signal output terminal 2045, a sixth signal output terminal 2046, and a seventh signal output terminal 2047, as well as seven corresponding lower signal output terminals 20411.

[0041] The switching circuit board 200 is also provided with a standard micro current source output terminal 203, which includes a first signal terminal 2031, a second signal terminal 2032, a third signal terminal 2033, a fourth signal terminal 2034, a fifth signal terminal 2035, a sixth signal terminal 2036 and a seventh signal terminal 2037, as well as seven corresponding lower signal terminals 20311;

[0042] During standard signal calibration, the seven lower signal terminals 20311 and seven lower signal output terminals 20411 on the switching circuit board 200 are connected one-to-one. The first input terminals 2021 to the seventh input terminals 2027 are connected one-to-one with the first signal terminals 2031 to the seventh signal terminals 2037 through U-shaped jumpers 300. Then, the first output terminals 2061 to the seventh output terminals 2067 are connected one-to-one with the first transmitting terminals 2071 to the fifth transmitting terminals 2075 and calibrated in turn.

[0043] Among the optional methods in this embodiment, the more preferred one is:

[0044] The switching circuit board 200 is provided with a signal receiving port 201 and a signal output port 207. The signal receiving port 201 is electrically connected to the receiving cup 2, and the signal output port 207 is electrically connected to the mass spectrometer data acquisition port.

[0045] The signal receiving port 201 includes five lower receiving terminals 20111, the signal output port 207 includes five lower transmitting terminals 20711, the five receiving cups 2 are respectively connected to the five lower receiving terminals 20111 via wires, and the mass spectrometer is connected to the five lower transmitting terminals 20711 via five wires.

[0046] Among the optional methods in this embodiment, the more preferred one is:

[0047] The signal receiving port 201 includes five receiving terminals, and the amplifier input interface 202 includes seven input terminals. The five receiving terminals are respectively connected to five of the seven input terminals through U-shaped jumpers 300.

[0048] Five high-impedance amplifier modules 100 are respectively connected to corresponding lower input terminals 20211 and lower output terminals 20611. The signal receiving port 201 includes a first receiving terminal 2011, a second receiving terminal 2012, a third receiving terminal 2013, a fourth receiving terminal 2014, and a fifth receiving terminal 2015 corresponding to the five lower receiving terminals 20111. The amplifier input interface 202 includes a first input terminal 2021, a second input terminal 2022, a third input terminal 2023, a fourth input terminal 2024, and a fifth output terminal 20611 corresponding to the seven lower input terminals 20211. Input terminals 2024, 2025, 2026, and 2027, and receiving terminals 2011, 2012, 2013, 2014, and 2015 are connected one-to-one with five of the input terminals 2021, 2022, 2023, 2024, 2025, 2026, and 2027 via U-shaped jumpers 300.

[0049] The U-shaped jumper 300 includes a copper tube 310, which is flexible and has connectors 320 at both ends.

[0050] Among the optional methods in this embodiment, the more preferred one is:

[0051] The signal output port 207 includes five transmitting terminals, and the amplifier output interface 206 includes seven output terminals. The five transmitting terminals are respectively connected to five of the seven output terminals through U-shaped jumpers 300.

[0052] The amplifier output interface 206 includes a first output terminal 2061, a second output terminal 2062, a third output terminal 2063, a fourth output terminal 2064, a fifth output terminal 2065, a sixth output terminal 2066, and a seventh output terminal 2067 corresponding to five lower output terminals 20611. The signal output port 207 includes a first transmission terminal 2071, a second transmission terminal 2072, a third transmission terminal 2073, a fourth transmission terminal 2074, and a fifth transmission terminal 2075 corresponding to five lower transmission terminals 20711.

[0053] If the first receiving terminal 2011 is connected to the first input terminal 2021 via a U-shaped jumper 300, then the corresponding first transmitting terminal 2071 must be connected to the first output terminal 2061 via a U-shaped jumper 300.

[0054] In this embodiment, all terminals of the high-impedance amplifier fast switching device for the mass spectrometer are connected to insulating bases 208.

[0055] Among the optional methods in this embodiment, the more preferred one is:

[0056] An adjustment bracket 400 is mounted on the switching circuit board 200. Five N-shaped brackets 500 are slidably connected to the adjustment bracket 400. Both ends of the N-shaped brackets 500 are slidably connected to vertically arranged control rods 510. One end of the ten U-shaped jumpers 300 used to connect the amplifier input interface 202 and the amplifier output interface 206 is fixedly connected to the ten control rods 510 respectively. The vertical sliding of the control rods 510 can drive the U-shaped jumpers 300 to be plugged into / out of the input terminal and the output terminal.

[0057] The adjustment bracket 400 can be mounted on the switching circuit board 200 with screws. Both ends of the N-shaped bracket 500 are slidably connected to control rods 510. The control rods 510 are fixedly connected to one end of the U-shaped jumper 300 that connects to the amplifier input interface 202 and the amplifier output interface 206. The vertical sliding of the control rods 510 controls the insertion and removal of the U-shaped jumper 300. When the N-shaped bracket 500 slides, it can drive the plug-in ends of the U-shaped jumper 300 on both sides to move synchronously, so that the plugged amplifier input interface 202 corresponds to the amplifier output interface 206.

[0058] Among the optional methods in this embodiment, the more preferred one is:

[0059] A gear 520 is rotatably connected to the N-shaped frame 500, and a rack 410 that meshes with the gear 520 is fixedly connected to the adjusting frame 400. When the N-shaped frame 500 slides, the gear 520 rolls on the rack 410. Two pawls 530 are symmetrically hinged inside the N-shaped frame 500 above the gear 520. A spring 540 is connected between the two pawls 530 and the N-shaped frame 500. A camshaft 550 is rotatably connected between the two pawls 530. The camshaft 550 can rotate forward or backward, thereby driving one of the pawls 530 away from the teeth of the gear 520, so that the gear 520 can change the direction of unidirectional rotation.

[0060] The high-impedance amplifier module 100 is linearly connected to the switching circuit board 200 according to its resistance value. During use, if the resistance values ​​are mismatched, such as when the abundance of the sample being tested is high and the resistance of the connected high-impedance amplifier module 100 is large, the voltage signal to be tested will be unstable. At this time, the camshaft 550 rotates, causing one pawl 530 to contact the gear 520 and the other pawl 530 to move away from the gear 520. This allows the gear 520 to roll in only one direction, which in turn allows the adjustment frame 400 to slide in only one direction. During the fabrication of the device, the installation arrangement is such that the unidirectional sliding direction of the N-shaped frame 500 in this state is towards the high-impedance amplifier module 100 with the low resistance value, thereby reducing the number of attempts to switch the high-impedance amplifier module 100 and improving work efficiency.

[0061] Among the optional methods in this embodiment, the more preferred one is:

[0062] An electric rotating rod 560 is rotatably connected inside the N-shaped frame 500. The output end of the electric rotating rod 560 is fixedly connected to the camshaft 550. When the voltage input from the current high-impedance amplifier module 100 to the data acquisition card frequently reaches the upper limit, the electric rotating rod 560 rotates in the first direction, so that the gear 520 can only roll in the direction of the input terminal and output terminal corresponding to the low-impedance high-impedance amplifier module 100.

[0063] During testing, the system detects the voltage value of the high-impedance amplifier module 100. When the voltage value is not appropriate, the electric rotary rod 560 is controlled to rotate in the required direction according to the positive or negative value of the voltage deviation, thereby switching the working state of the two pawls 530, so that the N-shaped frame 500 can only slide towards the high-impedance amplifier module 100 with high or low resistance.

[0064] Among the optional methods in this embodiment, the more preferred one is:

[0065] A pressure plate 570 is fixedly connected to the electric rotating rod 560. Two indicator lights 590 are installed on the N-shaped frame 500. Two indicator switches 580 corresponding to the two indicator lights 590 are provided at the lower part of the pressure plate 570. When the electric rotating rod 560 rotates in the first direction, the indicator light 590 close to the low-resistance high-resistance amplifier module 100 lights up.

[0066] like Figure 10 As shown, when the camshaft 550 rotates to the right, the left pawl 530 is in the working state, and the right pawl 530 disengages from the gear 520. At this time, the gear 520 can only rotate counterclockwise, which means that the N-shaped bracket 500 can only slide to the left. In this state, the pressure plate 570 on the electric lever 560 presses on the indicator switch 580 on the left, so that the indicator light 590 on the left lights up, indicating that the N-shaped bracket 500 can only slide to the left.

[0067] A method for rapid switching of high-impedance amplifiers in a mass spectrometer, using a rapid switching device for high-impedance amplifiers in a mass spectrometer, includes the following steps:

[0068] Connect the signal output terminals of the five receiving cups 2 to the signal receiving terminals of the five signal receiving ports 201, connect the input port and output port of the high impedance amplifier module 100 to the amplifier input interface 202 and the amplifier output interface 206 respectively, and connect the signal output port 207 to the mass spectrometer.

[0069] When switching amplifiers, disconnect the power supply of the mass spectrometer, and use a U-shaped jumper 300 to connect the five receiving terminals of the signal receiving port 201 to five of the seven input terminals of the appropriate amplifier input interface 202. Connect the output terminal of the amplifier output interface 206 corresponding to the input terminal to the transmitting terminal of the signal output port 207 corresponding to the signal receiving port 201. After the connection is completed, turn the power supply of the mass spectrometer back on, and you can start using the new amplifier for measurement.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid switching device for a high-impedance amplifier in a mass spectrometer, comprising an analysis tube (1) and a plurality of receiving cups (2) disposed within the analysis tube (1), characterized in that: It also includes a switching circuit board (200) and multiple high-resistance amplifier modules (100). The multiple high-resistance amplifier modules (100) are electrically connected to the switching circuit board (200). The signal input terminal of the switching circuit board (200) is electrically connected to the multiple analytical tubes (1), and the signal output terminal is connected to the mass spectrometer data acquisition port. The multiple high-resistance amplifier modules (100) have different resistance values. By switching the on state of the multiple high-resistance amplifier modules (100), it is possible to measure ion current signals of different abundances. An adjustment bracket (400) is mounted on the switching circuit board (200). Five N-shaped brackets (500) are slidably connected to the adjustment bracket (400). Gears (520) are rotatably connected to the N-shaped brackets (500). A rack (410) that meshes with the gears (520) is fixedly connected to the adjustment bracket (400). When the N-shaped brackets (500) slide, the gears (520) roll on the racks (410). The N-shaped brackets (500) are located within the racks (410). The upper part of the gear (520) is symmetrically hinged with two pawls (530). A spring (540) is connected between the two pawls (530) and the N-shaped frame (500). A camshaft (550) is rotatably connected between the two pawls (530). The camshaft (550) can rotate forward or backward, thereby driving one of the pawls (530) away from the teeth of the gear (520), so that the gear (520) can change the direction of unidirectional rotation. An electric rotating rod (560) is rotatably connected inside the N-shaped frame (500). The output end of the electric rotating rod (560) is fixedly connected to the camshaft (550). When the voltage input from the high-impedance amplifier module (100) to the data acquisition card frequently reaches the upper limit, the electric rotating rod (560) rotates in the first direction, so that the gear (520) can only roll in the direction of the input terminal and output terminal corresponding to the low-impedance high-impedance amplifier module (100). The switching circuit board (200) is provided with an amplifier input interface (202) and an amplifier output interface (206). The input and output terminals of the high-impedance amplifier module (100) are electrically connected to the amplifier input interface (202) and the amplifier output interface (206) respectively. The switching circuit board (200) is provided with a signal receiving port (201) and a signal output port (207). The signal receiving port (201) is electrically connected to the receiving cup (2), and the signal output port (207) is electrically connected to the mass spectrometer data acquisition port. The signal receiving port (201) includes five receiving terminals, and the amplifier input interface (202) includes seven input terminals. The five receiving terminals are respectively connected to five of the seven input terminals via U-shaped jumpers (300). The signal output port (207) includes five transmitting terminals, and the amplifier output interface (206) includes seven output terminals. The five transmitting terminals are respectively connected to five of the seven output terminals through the U-shaped jumper (300). Both ends of the N-shaped frame (500) are slidably connected to vertically arranged control rods (510). One end of each of the ten U-shaped jumpers (300) used to connect the amplifier input interface (202) and the amplifier output interface (206) is fixedly connected to the ten control rods (510). The vertical sliding of the control rods (510) can drive the U-shaped jumpers (300) to be inserted / removed from the input terminal and the output terminal.

2. The rapid switching device for high-impedance amplifiers in a mass spectrometer according to claim 1, characterized in that: A pressure plate (570) is fixedly connected to the electric rotating rod (560), and two indicator lights (590) are installed on the N-shaped frame (500). Two indicator switches (580) corresponding to the two indicator lights (590) are provided on the lower part of the pressure plate (570). When the electric rotating rod (560) rotates in the first direction, the indicator light (590) near the low-resistance high-resistance amplifier module (100) lights up.

3. A method for rapid switching of high-impedance amplifiers in a mass spectrometer, using the rapid switching device for high-impedance amplifiers in a mass spectrometer as described in claim 2, characterized in that... Includes the following steps: Connect the signal output terminals of the five receiving cups (2) to the signal receiving terminals of the five signal receiving ports (201), connect the input port and output port of the high impedance amplifier module (100) to the amplifier input interface (202) and the amplifier output interface (206) respectively, and connect the signal output port (207) to the mass spectrometer. When switching amplifiers, disconnect the power supply of the mass spectrometer, use a U-shaped jumper (300) to connect the five receiving terminals of the signal receiving port (201) to five of the seven input terminals of the appropriate amplifier input interface (202), and connect the output terminal of the amplifier output interface (206) corresponding to the input terminal to the transmitting terminal of the signal output port (207) corresponding to the signal receiving port (201). After the connection is completed, turn the power supply of the mass spectrometer back on, and you can start using the new amplifier for measurement.

Images