Sample injection pipe inner diameter adjusting system

Abstract

The utility model provides a sample introduction pipe inner diameter adjusting system, which is characterized in that a sample introduction pipe is connected with a vacuum chamber through a first connecting pipe, and the sample introduction pipe inner diameter adjusting system comprises a clamping connecting device, a sample outlet end used for clamping the sample introduction pipe and an input end of the first connecting pipe, the sample injection hole of the sample injection pipe is hermetically communicated with the joint of the first connecting pipe; the flow meter is used for detecting a real-time flow value of a sample input into the vacuum chamber through the sample feeding pipe; the pipe pressing device comprises at least three extrusion cutting dies which are arranged on the circumferential side of the sample injection end of the sample injection pipe and are distributed in the circumferential direction of the sample injection pipe, and a driving assembly used for driving the extrusion cutting dies to move centripetally in the radial direction of the sample injection pipe; and the central control device is used for controlling the feeding stroke of the sample injection pipe extruded by the extrusion cutting die according to the difference value between the real-time flow value and the target flow value. The system for adjusting the inner diameter of the sample injection pipe ensures that the real-time air pressure value of the vacuum chamber is adjusted to the target air pressure and the real-time flow value is accurately adjusted to the target flow value at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of mass spectrometry analysis, in particular to an injection tube inner diameter adjustment system. Background Art

[0002] In order to meet the high vacuum requirements of mass spectrometers, pinch valves, quartz capillaries or metal injection tubes are currently commonly used in small and portable mass spectrometers to control the injection volume and ensure the high vacuum working environment of the mass analyzer. However, pinch valves are not conducive to the miniaturization and portability of instruments, and the hoses need to be frequently replaced, which increases costs. The inner diameter of the quartz capillary is small, but its sealing connection with other pipelines needs to be converted, and its insufficient strength limits its application range. Therefore, small and portable mass spectrometers mostly use metal injection tubes with simple connection structures and high strength.

[0003] However, due to the processing properties of metal materials, the smaller the inner diameter of the metal injection tube, the more difficult it is to manufacture. Therefore, the inner diameter of the injection hole of the metal injection tube is usually larger. The mass analyzer of the mass spectrometer needs to work in a high vacuum environment. When the sample to be tested is introduced into the mass analyzer through the metal injection tube under atmospheric pressure, if the inner diameter of the injection hole is too large, the flow rate of the sample to be tested will increase.

[0004] Large mass spectrometers are often equipped with multi-stage vacuum chambers and high-power vacuum systems to cope with the impact of increased flow rates. However, the vacuum system power of small and portable mass spectrometers is limited. When the aperture of the metal inlet tube is too large, it will affect the vacuum environment and reduce its stability and detection capability. In application scenarios where the vacuum environment needs to be maintained for a long time for monitoring and analysis, it is difficult to meet the use requirements of the mass spectrometer.

[0005] In summary, how to accurately adjust the inner diameter of the injection hole of the metal injection tube to control the flow rate of the sample to be tested passing through its injection hole, so as to meet the vacuum level required for the specific application scenario of the flow matching mass spectrometer and ensure the working stability and detection capability of the mass spectrometer, is a technical problem that needs to be urgently solved in this field. Utility Model Content

[0006] The utility model provides a sampling tube inner diameter adjustment system to solve the technical problem in the prior art of how to accurately adjust the inner diameter size of the sampling hole of a metal sampling tube to match the vacuum environment required by a mass spectrometer.

[0007] In order to solve the above problems, the technical solution adopted by the utility model is:

[0008] The utility model provides a sampling tube inner diameter adjustment system, wherein the sampling tube is connected to a vacuum chamber through a first connecting tube, and the sampling tube inner diameter adjustment system further comprises:

[0009] A clamping connection device, used for clamping the sample outlet end of the sample injection tube and the input end of the first connecting tube, and making the connection between the sample injection tube and the first connecting tube sealed and connected;

[0010] A flow meter, used for detecting a real-time flow value of a sample input into the vacuum chamber through a sample inlet tube;

[0011] The tube pressing device comprises at least three extrusion cutter dies arranged on the peripheral side of the sampling end of the sampling tube and distributed along the circumference of the sampling tube, and a driving assembly for driving the extrusion cutter dies to move radially and centripetally along the sampling tube;

[0012] The central control device controls the feeding stroke of the extrusion die extruding the sample injection tube according to the difference feedback between the real-time flow value and the target flow value.

[0013] Preferably, the clamping connection device includes: a tube clamp joint, including a first clamping cavity and a second clamping cavity, which are arranged at two ends of the tube clamp joint relatively to each other, and a conveying channel, which passes through the first clamping cavity and the second clamping cavity; and a clamping mechanism, which is used to clamp the sample outlet end and the input end of the first connecting tube in the first clamping cavity and the second clamping cavity respectively, and to make the sample injection hole and the first connecting hole of the first connecting tube sealed and connected through the conveying channel.

[0014] Preferably, the first clamping cavity includes a first tapered hole provided at one end of the tube clamp joint, and a first sealing step provided at the bottom end of the first tapered hole close to the second clamping cavity; the second clamping cavity includes a threaded hole provided at the other end of the tube clamp joint, and a second tapered hole provided at the bottom end of the threaded hole close to the first clamping cavity, and a second sealing step provided at the bottom end of the second tapered hole close to the first clamping cavity; the delivery channel passes through the first sealing step and the second sealing step; the sample outlet end and the input end of the first connecting tube are respectively correspondingly abutted against the first sealing step and the second sealing step, and the sample inlet hole, the first connecting hole and the delivery channel are aligned;

[0015] The clamping mechanism includes:

[0016] A compression nut, comprising a connecting portion sleeved on the outside of the input end of the first connecting tube and an opening portion provided at one end of the connecting portion, wherein the inner side wall of the opening portion is screwed to the outer side of one end of the tube clamp joint; a first sleeve ring, sleeved on the outside of the sample outlet end and located between the first tapered hole and the connecting portion, and the outer side of the first sleeve ring facing the first tapered hole is provided with a first tapered surface matching the shape of the first tapered hole; a compression screw, comprising a hollow nut portion and a hollow screw portion, which are coaxially connected and sleeved on the outside of the input end of the first connecting tube, and the outer side wall of the hollow screw portion is screwed to the inner side wall of the threaded hole; and a second sleeve ring, sleeved on the outside of the input end of the first connecting tube and located between the second tapered hole and the hollow screw portion, and the outer side of the second sleeve ring facing the second tapered hole is provided with a second tapered surface matching the shape of the second tapered hole;

[0017] By tightening the compression nut and the compression screw, the first tapered surface and the second tapered surface are respectively pressed against the corresponding inner side walls of the first tapered hole and the second tapered hole, so that the injection hole and the first connecting hole are sealed and connected through the delivery channel.

[0018] Furthermore, the output end of the first connecting tube is connected to the inlet end of the flow meter, and the injection tube inner diameter adjustment system further includes:

[0019] The second connecting tube has an input end connected to the outlet end of the flow meter, and an output end of the second connecting tube connected to the vacuum chamber.

[0020] Preferably, the drive assembly comprises:

[0021] Drive shaft;

[0022] The transmission member is arranged on the driving shaft and is used to drive the driven wheel to rotate in a fixed direction around its axis under the drive of the driving shaft;

[0023] The vortex spiral guide groove is arranged in a centripetal spiral shape on the surface of the driven wheel perpendicular to the axis;

[0024] At least three guide structures are evenly spaced around the distribution axis and the guide structures point perpendicularly to the axis;

[0025] At least three centripetal pressure blocks are movably mounted on corresponding guide structures, and multiple arc-shaped slide grooves matching the vortex spiral guide grooves are arranged at intervals at the bottom of the centripetal pressure blocks. Each centripetal pressure block is evenly distributed on the driven wheel through the arc-shaped slide grooves meshing with the vortex spiral guide grooves.

[0026] The extrusion die is installed on the centripetal pressure block, and the die head of the extrusion die faces the axis;

[0027] When the injection end is coaxial with the axis and located between each extrusion die, the driven wheel is driven to rotate in the positive fixed axis direction, and each centripetal pressing block is driven by the vortex spiral guide groove to move centripetally along the corresponding guide structure perpendicular to the axis, thereby driving each extrusion die to extrude the injection tube in each direction.

[0028] Preferably, the drive assembly comprises:

[0029] At least three linear drive mechanisms are evenly spaced around the distribution axis, and are respectively used to drive at least three extrusion cutter dies to move centripetally along the radial straight lines of the injection tube on the injection end side.

[0030] Preferably, the sample injection tube is made of metal, and three or four extrusion cutter dies are provided, and the extrusion cutter dies are evenly spaced and distributed around the axis of the sample injection tube.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] The inner diameter adjustment system of the sampling tube provided by the utility model clamps the sampling outlet end of the sampling tube in the clamping cavity of the tube clamp joint through a clamping mechanism, and makes the sampling hole of the sampling tube and the conveying channel of the tube clamp joint seal and align; by evacuating the vacuum chamber to simulate the vacuum environment required by the mass analyzer of the mass spectrometer, the real-time air pressure value in the vacuum chamber and the real-time flow value of the sample entering the vacuum chamber through the metal sampling tube, the conveying channel and the sampling flow channel are monitored in real time; on the premise of ensuring that the real-time air pressure value in the vacuum chamber is adjusted to the target air pressure value, the feeding stroke of the extrusion die of the tube pressing device is accurately feedback-controlled according to the difference between the real-time flow value and the target flow value to extrude the sampling tube, so as to accurately adjust the real-time flow value to the target flow value, thereby producing a metal sampling tube with an inner diameter size of the sampling hole that meets the vacuum degree required for matching the specific application scenario of the mass spectrometer, ensuring that the mass analyzer of the mass spectrometer can work under the vacuum environment of the set degree, thereby improving the working stability and detection capability of the mass spectrometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution proposed by the utility model, it is described in detail below in combination with the embodiments and drawings. It should be understood that the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, these drawings can be changed under the concept of the utility model.

[0034] Figure 1 A schematic diagram of the framework structure of an embodiment of the sample injection tube inner diameter adjustment system provided by the utility model;

[0035] Figure 2 for Figure 1 A schematic diagram of the assembly three-dimensional structure of the clamping connection device;

[0036] Figure 3 for Figure 2 A schematic cross-sectional view of the clamping connection device along the HH direction;

[0037] Figure 4 for Figure 1 A schematic diagram of the assembly three-dimensional structure of the first embodiment of the pipe pressing device;

[0038] Figure 5 for Figure 1 A schematic diagram of the assembly three-dimensional structure of the second embodiment of the pipe pressing device;

[0039] Figure 6 for Figure 1 A schematic diagram of the top view of the structure of the tube pressing device in the embodiment of the present invention, which uses four centripetal pressing blocks and four extrusion cutter dies to realize four-way extrusion;

[0040] Figure 7The utility model provides a control logic flow chart of the control method for adjusting the inner diameter of the injection tube.

[0041] Among them, the main marks of the drawings in the figure are as follows:

[0042] 1. Vacuum subsystem; 11. Sealed housing; 111. Vacuum chamber; 112. Vent hole; 12. Vacuum pump; 121. Vacuum channel; 13. Vacuum gauge; 2. Clamping and connecting device; 21. Pipe clamp joint; 211. First clamping cavity; 2111. First tapered hole; 2112. First sealing step; 212. Second clamping cavity; 2121. Threaded hole; 2122. Second tapered hole; 2123. Second sealing step; 213. Output Delivery channel; 22, clamping mechanism; 221, first sleeve; 2211, first conical surface; 222, second sleeve; 2221, second conical surface; 223, clamping nut; 2231, connecting portion; 2232, opening portion; 224, clamping screw; 2241, hollow nut portion; 2242, hollow screw portion; 3, first connecting pipe; 31, first connecting hole; 32, input end; 33, output end; 4, flow meter; 41, inlet end ; 42, outlet end; 43, second connecting pipe; 431, second connecting hole; 5, driving shaft; 51, transmission member; 511, worm; 512, active bevel gear; 6, driven wheel; 61, vortex spiral guide rail; 611, vortex spiral guide groove; 62, turbine; 63, driven bevel gear; 64, wheel inner hole; 7, centripetal pressure block; 71, arc convex rib; 711, arc chute; 72, positioning pin; 73, connecting chute; 74, extrusion die; 741. Cutter head; 742. Locking screw; 8. Support seat; 81. Guide structure; 811. Support guide rail; 82. Clearance hole; 83. Annular cavity; 84. Support base; 841. Lower annular groove; 85. Support top seat; 851. Upper annular groove; 86. Extension seat; 861. Worm mounting cavity; 87. Mounting through hole; 9. Central control device; 10. Sample injection tube; 101. Sample injection hole; 102. Sample injection end; 103. Sample output end.

[0043] Among them, the marks in the figure are as follows:

[0044] A. Central axis; B. Axis centerline; C. Driving shaft rotation direction; D. Driven wheel rotation direction; E. Cutting die movement direction; F. Pipe pressing device; G. Flow detection subsystem. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 1-7 And embodiments, the utility model is further described in detail.

[0046] Please also read Figure 1-5The utility model provides a sampling tube inner diameter adjustment system, wherein the sampling tube 10 is connected to the vacuum chamber 111 through the first connecting tube 3, and the sampling tube inner diameter adjustment system also includes:

[0047] The clamping connection device 2 is used to clamp the sample outlet end 103 of the sample injection tube 10 and the input end 32 of the first connecting tube 3, and to seal and communicate the connection between the sample injection hole 101 of the sample injection tube 10 and the first connecting hole 31 of the first connecting tube 3; the flow meter 4 is connected between the output end 33 of the first connecting tube 3 and the vacuum chamber 111, and is used to detect the real-time flow value of the sample input into the vacuum chamber 111 through the sample injection hole 101 of the sample injection tube 10;

[0048] The tube pressing device F comprises at least three extrusion cutter dies 74 arranged on the circumference of the injection end 102 of the injection tube 10 (the other axial end of the injection tube 10 relative to the injection end 102) and distributed along the circumference of the injection tube 10, and a driving assembly for driving the extrusion cutter dies 74 to move radially and centripetally along the injection tube 10, and is used to drive at least three extrusion cutter dies 74 to move radially and linearly and centripetally along the circumference of the injection end of the injection tube 10 when the sample outlet end 103 of the injection tube 10 is clamped in the clamping cavity and the injection hole 101 is sealed and aligned with the first connecting hole 31 and connected, thereby driving each extrusion cutter dies 74 to squeeze the injection tube 10 in each direction, so as to adjust the inner diameter of the injection hole 101 through extrusion deformation;

[0049] The central control device 9 controls the extrusion die 74 to extrude the feed stroke of the sampling tube 10 according to the difference feedback between the real-time flow value and the target flow value, so as to adjust the real-time flow value to the target flow value, thereby accurately controlling the inner diameter size of the sampling hole 101 of the metal sampling tube 10 to be adapted to the vacuum degree required for the specific application scenario of the flow matching mass spectrometer, thereby ensuring the working stability and detection capability of the mass spectrometer.

[0050] Please also read Figure 1-5 In this embodiment, the injection tube inner diameter adjustment system includes:

[0051] Vacuum subsystem 1, flow detection subsystem G, the above-mentioned pipe pressing device F and the above-mentioned central control device 9.

[0052] Wherein, the vacuum subsystem 1 comprises:

[0053] The vacuum device comprises a sealed housing 11, the internal accommodation space of the sealed housing 11 (i.e., the inner cavity of the sealed housing 11) forms the above-mentioned vacuum chamber 111; a vacuum pump 12, connected to the vacuum chamber 111 inside the sealed housing 11 through a vacuum channel 121, used to evacuate the vacuum chamber 111 to form a certain vacuum degree in the vacuum chamber 111; a vacuum gauge 13, sealedly connected to the vacuum chamber 111 inside the sealed housing 11, used to detect the real-time air pressure value in the vacuum chamber 111;

[0054] The central control device 9 controls the rotation speed of the vacuum pump 12 according to the difference feedback between the real-time air pressure value and the target air pressure value, so as to adjust the real-time air pressure value to the target air pressure value, thereby ensuring that the vacuum degree in the vacuum chamber 111 is stable at a preset degree, thereby ensuring that the vacuum / negative pressure environment in the vacuum chamber 111 meets the use requirements of the mass spectrometer in the monitoring and analysis application scenario for a long time.

[0055] The flow detection subsystem G includes:

[0056] The above-mentioned sample injection tube 10, the above-mentioned clamping connection device 2, the above-mentioned first connecting tube 3 and the above-mentioned flow meter 4.

[0057] See also Figure 1 In this embodiment, the flow meter 4 can be a differential pressure flow meter, a capacitance flow meter or an electromagnetic flow meter.

[0058] See also Figure 1 In this embodiment, the sealed shell 11 is provided with a vent hole 112 , and the vacuum gauge 13 is sealed and connected to the vacuum chamber 111 inside the sealed shell 11 through the vent hole 112 .

[0059] In this embodiment, the vacuum gauge 13 may be a Pirani vacuum gauge, a capacitance film vacuum gauge or an ionization vacuum gauge.

[0060] Please also read Figure 1-3 In this embodiment, the clamping connection device 2 includes:

[0061] The tube clamp connector 21 includes a first clamping cavity 211 and a second clamping cavity 212, which are arranged at two ends of the tube clamp connector 21, and a conveying channel 213, which passes through the first clamping cavity 211 and the second clamping cavity 212; and a clamping mechanism 22, which is used to clamp the sample outlet end 103 of the sample injection tube 10 and the input end 32 of the first connecting tube 3 in the first clamping cavity 211 and the second clamping cavity 212 respectively, and to make the sample injection hole 101 of the sample injection tube 10 and the first connecting hole 31 of the first connecting tube 3 sealed and connected through the conveying channel 213.

[0062] Please also read Figure 1-3In this embodiment, the first clamping cavity 211 includes a first tapered hole 2111 provided at one axial end of the tube clamp joint 21, and a first sealing step 2112 provided at the bottom end of the first tapered hole 2111 close to the second clamping cavity 212; the second clamping cavity 212 includes a threaded hole 2121 provided at the other axial end of the tube clamp joint 21, and a second tapered hole 2122 provided at the bottom end of the threaded hole 2121 close to the first clamping cavity 211, and a second sealing step 2123 provided at the bottom end of the second tapered hole 2122 close to the first clamping cavity 211;

[0063] The delivery channel 213 passes through the first sealing step 2112 and the second sealing step 2123; the sample outlet 103 and the input end 32 of the first connecting tube 3 are respectively in contact with the first sealing step 2112 and the second sealing step 2123, and the injection hole 101, the first connecting hole 31 and the delivery channel 213 are aligned; the clamping mechanism 22 includes:

[0064] A clamping nut 223, the clamping nut 223 comprises a connecting portion 2231 sleeved on the outside of the input end 32 of the first connecting tube 3 and an opening portion 2232 provided at one axial end of the connecting portion 2231, the inner side wall of the opening portion 2232 being threadedly connected to the outside of one axial end of the tube clamp joint 21; a first collar 221 sleeved on the outside of the sample outlet end 103 and located between the first tapered hole 2111 and the connecting portion 2231, and a first tapered surface 2211 matching the shape of the first tapered hole 2111 is provided on the outside of one end of the first collar 221 facing the first tapered hole 2111;

[0065] The clamping screw 224 comprises a hollow nut portion 2241 and a hollow screw portion 2242 which are coaxially connected and sleeved on the outside of the input end 32 of the first connecting tube 3, and the outer wall of the hollow screw portion 2242 is threadedly connected to the inner wall of the threaded hole 2121; and a second collar 222 which is sleeved on the outside of the input end 32 of the first connecting tube 3 and is located between the second tapered hole 2122 and the hollow screw portion 2242, and the outer side of one end of the second collar 222 facing the second tapered hole 2122 is provided with a second tapered surface 2221 matching the shape of the second tapered hole 2122;

[0066] By respectively screwing the inner wall of the opening portion 2232 into the outer thread of one axial end of the tube clamp joint 21 and the outer wall of the hollow screw portion 2242 into the inner wall of the threaded hole 2121 in a corresponding positive direction, the clamping nut 223 and the clamping screw 224 are respectively tightened, and then the first tapered surface 2211 and the second tapered surface 2221 are respectively pressed against the corresponding inner walls of the first tapered hole 2111 and the second tapered hole 2122, so that the injection hole 101 and the first connecting hole 31 are sealed and connected through the delivery channel 213, thereby forming a sample input flow channel composed of the injection hole 101 of the injection tube 10, the delivery channel 213 inside the tube clamp joint 21, and the first connecting hole 31 of the first connecting tube 3 connected end to end.

[0067] By respectively screwing the inner wall of the opening portion 2232 and the outer thread of one axial end of the tube clamp joint 21 and the outer wall of the hollow screw portion 2242 and the inner wall of the threaded hole 2121 in opposite directions, the clamping nut 223 and the clamping screw 224 are respectively loosened, and then the first tapered surface 2211 and the second tapered surface 2221 are respectively separated from the corresponding inner walls of the first tapered hole 2111 and the second tapered hole 2122, so that the sampling tube 10 and the first connecting tube 3 can be respectively disassembled from the clamping connection device 2.

[0068] See also Figure 2 , 3 As a preferred embodiment, the tube clamp joint 21 is cylindrical, the clamping nut 223 is cylindrical in shape, the inner diameter of the opening portion 2232 matches the outer diameter of the tube clamp joint 21, and the inner diameter of the connecting portion 2231 matches the outer diameter of the injection tube 10, the first collar 221 is conical in shape, the inner diameter of which matches the outer diameter of the injection tube 10, the clamping screw 224 is cylindrical in shape, the inner diameter of the hollow nut portion 2241 and the inner diameter of the hollow screw portion 2242 match the outer diameter of the tube clamp joint 21, and the outer diameter of the hollow screw portion 2242 matches the inner diameter of the threaded hole 2121 of the tube clamp joint 21.

[0069] As a more preferred embodiment, the first ring 221 is made of elastic material (such as elastic plastic, rubber, etc.), so that when the tightening nut 223 is tightened to press the first conical surface 2211 against the inner wall of the first conical hole 2111, a temporary seal between the injection hole 101 and the delivery channel 213 is achieved, and the inner diameter surface of the elastic material of the first ring 221 is in contact with the outer side surface of the injection tube 10, thereby preventing the outer surface of the injection tube 10 from being damaged due to hard contact.

[0070] As a more preferred embodiment, the first ring 221 is made of metal material (such as steel, copper, etc.), so that when the clamping screw 224 is tightened to press the second conical surface 2221 against the inner wall of the second conical hole 2122, a permanent seal is achieved between the first connecting hole 31 and the conveying channel 213, thereby improving the air tightness of the clamping connection device 2.

[0071] See also Figure 1 In this embodiment, the output end 33 of the first connecting tube 3 is connected to the inlet end 41 of the flow meter 4, and the injection tube inner diameter adjustment system further includes:

[0072] A second connecting tube 43, the input end of which is connected to the outlet end 42 of the flow meter 4, and the output end of the second connecting tube 43 is connected to the interior of the vacuum chamber 111, thereby forming an output flow channel which is sequentially composed of the interior of the flow meter 4 and the second connecting hole 431 of the second connecting tube 43. The above-mentioned input flow channel (including the injection hole 101, the conveying channel 213 and the first connecting hole 31 in sequence) and the output flow channel (including the flow meter 4 and the second connecting hole 431 in sequence) sequentially constitute the injection flow channel for inputting the sample into the interior of the vacuum chamber 111.

[0073] See also Figure 1 In this embodiment, the central control device 9 adopts an industrial computer, including a central control host, a display screen and a command input device.

[0074] Please also read Figure 1 , 4 6. In the first embodiment of the tube pressing device F of the injection tube inner diameter adjustment system provided by the present utility model, the driving assembly of the tube pressing device F includes:

[0075] The driving shaft 5 uses human power or mechanical power as a power input source to drive the driving shaft 5 to rotate around its central axis A, that is, the driving shaft 5 rotates in a fixed direction around the central axis A of the driving shaft 5 in a positive and negative direction; the transmission member 51 is provided on the driving shaft 5, and is used to drive the driven wheel 6 to rotate around the axis B of the driven wheel 6 in a positive and negative direction under the drive of the driving shaft 5, that is, the axis B of the driven wheel 6 is coaxially aligned with the conveying channel 213 of the above-mentioned pipe clamp joint 21, that is, the axis B of the driven wheel 6 is coaxially aligned with the first clamping cavity 211 and the opening of the pipe clamp joint 21, and the axial end of the first clamping cavity 211 of the pipe clamp joint 21 is arranged toward the driven wheel 6;

[0076] The rotation direction of the driven wheel 6 is a fixed axis rotation direction of forward and reverse rotation around the axis B of the driven shaft; the vortex spiral guide groove 611 is arranged in a centripetal spiral shape on the surface of the driven wheel 6 perpendicular to the axis B, that is, one end of the vortex spiral guide groove 611 is close to the edge of the driven wheel 6, and the other end of the vortex spiral guide groove 611 extends in a centripetal spiral shape to the middle of the driven wheel 6;

[0077] At least three guide structures 81 are evenly spaced around the axis B of the driven wheel 6, and the extension direction of the guide structure 81 is perpendicular to the axis B; at least three centripetal pressure blocks 7 can be movably installed on the corresponding guide structures 81 along the guide structures 81, and a plurality of arc-shaped slide grooves 711 matching the vortex spiral guide groove 611 are arranged at intervals at the bottom of the centripetal pressure blocks 7, and each centripetal pressure block 7 is meshed with a plurality of continuously spaced adjacent segments of the vortex spiral guide groove 611 through a plurality of arc-shaped slide grooves 711, so as to be evenly spaced on the driven wheel 6;

[0078] The extrusion cutter die 74 is mounted on the centripetal pressure block 7, and the cutter head 741 at one end of the extrusion cutter die 74 faces the axis B. When the sample outlet end 103 of the sample injection tube 10 is clamped in the first clamping cavity 211 by the clamping mechanism 22 and the sample injection hole 101 of the sample injection tube 10 is sealed and aligned with the delivery channel 213, the sample injection end 102 of the sample injection tube 10 is coaxially arranged with the axis B of the driven wheel 6 and placed between the extrusion cutter dies 74 (that is, the sample injection end 102 of the sample injection tube 10 passes through the gap between the extrusion cutter dies 74), the mechanical power controlled by the central control device 9 drives the drive shaft 5 to rotate in a positive fixed axis around its axis A. , which can drive the driven wheel 6 to rotate in the positive fixed axis, and at the same time, drive each centripetal pressing block 7 to move centripetally in a straight line perpendicular to the axis B along the corresponding guide structure 81 under the drive of the positive centripetal spiral rotation movement of the vortex spiral guide groove 611, thereby driving each extrusion knife die 74 to squeeze the sampling tube 10 at uniform intervals on the circumference of the sampling tube 10 in each direction with a centripetal feeding stroke matching the positive fixed axis rotation angle of the driven wheel 6, thereby adjusting the inner diameter of the sampling hole 101 of the sampling tube 10 by extrusion deformation.

[0079] On the contrary, the mechanical power controlled by the central control device 9 drives the driving shaft 5 to make reverse fixed-axis rotation around its central axis A, which can drive the driven wheel 6 to rotate in the reverse fixed-axis, thereby driving each centrifugal pressure block 7 to move centrifugally perpendicular to the axis line B along the corresponding guide structure 81 under the drive of the reverse centrifugal spiral rotation movement of the vortex spiral guide groove 611, and then drive each extrusion die 74 to open and close at even intervals around the sampling tube 10 in each direction with a centrifugal stroke matching the reverse fixed-axis rotation angle of the driven wheel 6, thereby loosening the sampling tube 10 whose inner diameter of the sampling hole 101 has been squeezed and adjusted, so that the operator can take out the sampling tube 10 by hand or mechanical clamping.

[0080] Please also read Figure 1 , 4 6. In the first embodiment of the pipe pressing device F provided by the present utility model:

[0081] The center axis A of the driving shaft 5 is perpendicular to the axis B of the driven wheel 6 but does not intersect. The transmission member 51 is a worm 511 coaxially connected to the driving shaft 5 , and the driven wheel 6 is a turbine 62 meshing with the worm 511 .

[0082] Please refer to the figure, as a preferred implementation of Example 1, the transmission member 51 is a left-handed or right-handed worm 511 with multiple helical teeth (not shown in the figure), and the dividing surface of the worm 511 is a cylindrical surface, and the driven wheel 6 is a turbine 62 (gear) with a plurality of teeth (not shown in the figure) that match the helical teeth of the worm 511 and are radially (radially) evenly spaced along the circumference of the rim. The transmission member 51 (worm 511) and the driven member (turbine 62) coaxially mounted on the drive shaft 5 are meshed with each other, thereby forming a worm 511 transmission mechanism of a gear pair with staggered axes (i.e., the axis B of the drive shaft 5 and the driven wheel 6 that are perpendicular to each other).

[0083] Please also read Figure 1 , 5 6. In the second embodiment of the pipe pressing device F provided by the present invention, the driving assembly of the pipe pressing device F is different from that in the first embodiment as follows:

[0084] The center axis A of the driving shaft 5 is perpendicular to and intersects with the axis line B of the driven wheel 6. The transmission member 51 is a driving bevel gear 512 coaxially connected to the driving shaft 5, and the driven wheel 6 is a driven bevel gear 63 meshing with the driving bevel gear 512. The transmission member 51 (driving bevel gear 512) and the driven member (driven bevel gear 63) coaxially mounted on the driving shaft 5 are meshed with each other, thereby forming a gear transmission mechanism of a gear pair with staggered axes (i.e., the axis lines B of the driving shaft 5 and the driven wheel 6 are perpendicular to each other).

[0085] When using the tube pressing device F provided by the utility model to adjust the inner diameter of the metal sampling tube 10, it is only necessary to manufacture or purchase a metal sampling tube 10 with a larger inner diameter and a lower processing cost, and then use the tube pressing device F to quickly and flexibly adjust the inner diameter of the sampling tube 10 by extrusion deformation. Compared with directly machining a metal sampling tube 10 with a smaller inner diameter, the tube pressing device F provided by the utility model reduces the difficulty of processing and manufacturing the metal sampling tube 10 with a smaller inner diameter and simplifies the manufacturing process, thereby reducing the manufacturing cost of the metal sampling tube 10 with an inner diameter that meets the specific vacuum environment requirements of the mass spectrometer.

[0086] Please also read Figure 1 , 4 5. As a common implementation method of embodiments 1 and 2, the driving assembly of the pipe pressing device F also includes:

[0087] A bearing seat (not shown in the figure), the drive shaft 5 is rotatably mounted horizontally on the bearing seat, that is, the central axis A of the drive shaft 5 is set horizontally; a support seat 8, the driven wheel 6 is rotatably mounted inside the support seat 8, and the driven wheel 6 is set horizontally, that is, the plane where the driven wheel 6 is located (the plane where the driven wheel 6 is located when the driven wheel 6 rotates on a fixed axis) is a horizontal plane parallel to the drive shaft 5; the vortex spiral guide groove 611 is arranged in a centripetal spiral shape on the upper surface (that is, the horizontal top surface) of the driven wheel 6 perpendicular to the axis B, so that each centripetal pressure block 7 of the driven wheel 6 and the extrusion die 74 installed thereon are stably mounted in the vortex spiral guide groove 611 on the horizontal top surface of the driven wheel 6; the drive shaft 5 is rotatably mounted horizontally on one side end of the support seat 8, and is connected to the driven wheel 6 through a transmission member 51, and the axis B of the driven wheel 6 is perpendicular to the central axis A of the drive shaft 5 (in Example 1, the central axis A does not intersect with the axis B, as shown in Example 1). Figure 4 As shown; in the second embodiment, the central axis A intersects the axis line B, as shown Figure 5 As shown), that is, the axis B is set vertically; a clearance hole 82 coaxial with the axis B is provided in the middle of the support seat 8, and at least three guide structures 81 are evenly distributed on the top surface of the support seat 8 around the axis B, and each of the three guide structures 81 corresponds to and connects to the clearance hole 82.

[0088] When the injection tube 10 is coaxial with the axis B of the driven wheel 6 , the injection tube 10 vertically passes through the clearance hole 82 in the middle of the support seat 8 and is located between the corresponding cutter heads 741 of each extrusion die 74 for extrusion by each extrusion die 74 .

[0089] See also Figure 4 , 5 As a preferred implementation method common to Examples 1 and 2, the support seat 8 is cylindrical, and the guide structure 81 is a guide groove provided on the top surface of the support seat 8 and radially penetrating the outer edge of the support seat 8 and the clearance hole 82 of the support seat 8. The relative inner side walls of the guide groove (guide structure 81) are respectively provided with a pair of support rails 811 perpendicular to the axis B; the relative outer side walls of the centripetal pressure block 7 are respectively provided with a pair of connecting grooves 73 matching the support rails 811, and the centripetal pressure block 7 is movably mounted on the corresponding guide groove (guide structure 81) through its pair of connecting grooves 73 corresponding to the pair of support rails 811.

[0090] As other implementation methods common to Examples 1 and 2, the pair of supporting guide rails 811 of the guiding structure 81 may also be replaced by a pair of supporting guide grooves (not shown in the figure), and the pair of connecting slide grooves 73 of the corresponding centripetal pressure block 7 may be replaced by a pair of connecting sliders (not shown in the figure) that cooperate with the supporting guide grooves.

[0091] See also Figure 4 , 5As a more preferred implementation method common to embodiments one and two, the support seat 8 is provided with an annular cavity 83 surrounding its circumferential direction, and one side end of the support seat 8 is provided with a mounting hole 87 connected to the annular cavity 83 along the radial direction of the support seat 8, and the drive shaft 5 is rotatably inserted into the mounting hole 87, and the transmission member 51 is provided at one end of the drive shaft 5 extending into the annular cavity 83; the driven wheel 6 is an annular wheel whose appearance matches the annular cavity 83, and the middle part of the driven wheel 6 in the form of an annular wheel is provided with a wheel inner hole 64, and the driven wheel 6 is rotatably installed in the annular cavity 83 and supported on the support seat 8, at this time, the annular cavity 83 surrounds and surrounds the driven wheel 6 between the wheel inner hole 64 and the outer circumferential side, that is, the wheel inner hole 64 is coaxial with the axis B, and at the same time, the driven wheel 6 is connected with the transmission member 51 in the annular cavity 83.

[0092] When the inner diameter of the injection hole 101 of the injection tube 10 is adjusted, the injection tube 10 is vertically and coaxially inserted into the clearance hole 82 of the support seat 8, so that the sample outlet end 103 (bottom end) of the injection tube 10 extends downward into and through the clearance hole 82, until the sample outlet end 103 passes through the opening and extends into the first clamping cavity 211 of the tube clamp joint 21, so as to make way for the injection tube 10 to avoid interference. At the same time, the injection end 102 (top end) of the injection tube 10 passes upward between the corresponding cutter heads 741 of each extrusion die 74, and extends to above the horizontal plane where each extrusion die 74 is located. In addition, the longer metal injection tube 10 can be moved up and down in the clearance hole 82, thereby adjusting the position of each extrusion die 74 in the length direction of the metal injection tube 10, so as to flexibly adjust the size of the inner diameter of the injection hole 101 and the injection flow rate at the specific length position of the metal injection tube 10 according to the actual application scenario, such as Figure 4 , 5 shown.

[0093] See also Figure 4 In the first embodiment, an extension seat 86 protruding horizontally outward is provided on one side of the support seat 8, and a worm 511 mounting cavity communicating with the annular cavity 83 is provided inside the extension seat 86. A mounting through hole 87 is provided on one side of the extension seat 86 and is parallel to the radially connected worm 511 mounting cavity of the support seat 8. The drive shaft 5 is rotatably inserted into the mounting through hole 87. The transmission member 51 (worm 511) is provided at one end of the drive shaft 5 extending into the worm 511 mounting cavity and meshes with the driven wheel 6 in the annular cavity 83.

[0094] See also Figure 4 , 5As a better implementation method common to Examples 1 and 2, the support seat 8 includes a support base 84 and a support top seat 85, both of which are cylindrical. The top of the support base 84 is provided with a lower annular groove 841 surrounding its circumferential direction, and the top edge of the lower annular groove 841 is provided with an upwardly protruding and arc-shaped support slide rail (not shown in the figure), and the bottom end of the support top seat 85 is provided with an upper annular groove 851 surrounding its circumferential direction and matching the lower annular groove 841.

[0095] During assembly, the bottom surface of the driven wheel 6 is first supported on the top surface of the supporting slide rail, and then the supporting base 84 and the supporting top seat 85 are connected up and down by screws to form a cylindrical supporting seat 8. When the supporting base 84 and the supporting top seat 85 are connected up and down, the upper annular groove 851 and the lower annular groove 841 are simultaneously connected up and down to form the above-mentioned annular cavity 83 that wraps the driven wheel 6, so that the bottom surface of the driven wheel 6 can be rotatably installed in the annular cavity 83 by sliding with the supporting slide rail located in the annular cavity 83. Figure 4 , 5 shown.

[0096] As a preferred implementation mode common to the first and second embodiments, the drive shaft 5 is connected to the output shaft of the drive motor (not shown in the figure) as a power input source.

[0097] See also Figure 4 , 5 As a preferred embodiment of the first and second embodiments, the top of the centripetal pressing block 7 is provided with a threaded mounting hole (not shown in the figure) and a positioning pin 72, and the extrusion die 74 is provided with a screw connection hole and a pin connection hole matching the threaded mounting hole and the positioning pin 72. The locking screw 742 passes through the corresponding screw connection hole and threaded mounting hole, and the positioning pin 72 passes through the corresponding pin connection hole, so that the extrusion die 74 is accurately positioned and installed on the top of the centripetal pressing block 7. When the extrusion die 74 is worn or damaged, or when the inner diameter of the metal sample injection tube 10 of a specific model and specification needs to be adjusted by extrusion, the extrusion die 74 can be quickly disassembled and replaced by disassembling the locking screw 742, thereby improving the adjustment efficiency of the inner diameter of the metal sample injection tube 10.

[0098] See also Figure 4 , 5 As a better implementation method common to embodiments one and two, a threaded mounting hole and a pair of pin mounting holes corresponding to the threaded mounting hole are provided at the top of the centripetal pressure block 7, and an extrusion die 74 is provided with a threaded connection hole and a pair of pin shaft connection holes matching the threaded mounting hole and the pin mounting hole. A locking screw 742 passes through the corresponding threaded connection hole and the threaded mounting hole, and a pair of positioning pins 72 pass through the corresponding pin shaft connection hole and the pin mounting hole, respectively, so that the extrusion die 74 is positioned and fastened to the top of the centripetal pressure block 7 with higher precision.

[0099] See also Figure 4 , 5 As a preferred embodiment of the first and second embodiments, the extrusion die 74 is in a long strip shape, the length direction of the extrusion die 74 coincides with the radial direction of the driven wheel 6, the cutter head 741 is an extrusion tip provided at one end of the length direction of the extrusion die 74, and the extrusion tip extends out of the centripetal pressure block 7 along the radial direction of the driven wheel 6 close to the axis B of the driven wheel 6 and points to the axis B. The die movement direction E of the extrusion die 74 is to move toward or away from the axis B along the radial direction of the driven wheel 6 corresponding to the positive centripetal or reverse centrifugal spiral motion of the vortex spiral guide groove 611.

[0100] When the sampling tube 10 is coaxially arranged with the axis line B and the driven wheel 6 is driven to rotate in the positive fixed axis direction, the extrusion tip (cutter head 741) is driven by the positive centripetal spiral motion of the vortex spiral guide groove 611 to move linearly and centripetally perpendicular to the axis line B along the radial direction of the driven wheel 6, and the extrusion tip (cutter head 741) always keeps pointing to the axis line B during the linear centripetal motion, thereby ensuring that each extrusion knife die 74 uniformly and centripetally extrude the metal sampling tube 10 in all directions on the circumference of the metal sampling tube 10, avoiding uneven extrusion caused by eccentric contact between the extrusion tip (cutter head 741) and the outer circumference of the metal sampling tube 10, resulting in the shape and inner diameter of the sampling hole 101 after deformation and adjustment being unable to meet the use requirements.

[0101] Please also read Figure 4-6 As a preferred embodiment common to the first and second embodiments, the centripetal pressure block 7 is provided with three (such as Figure 4 , 5 as shown) or four (as shown Figure 6 As shown in FIG. 1 , three or four centripetal pressing blocks 7 are radially (radially) evenly spaced and installed on the circumference of the vortex spiral guide groove 611, so that the inner diameter adjustment device of the sampling tube 10 can realize three-way or four-way extrusion of the metal sampling tube 10 in three or four directions on the circumference of the metal sampling tube 10 through three or four extrusion die dies 74, respectively. After extrusion, the end surface structure of the metal sampling tube 10 and the inner diameter change of the sampling hole 101 are as shown in FIG. Figure 4 , 5 shown.

[0102] See also Figure 4 , 5 As a preferred implementation scheme common to Examples 1 and 2, the centripetal pressure block 7 is rectangular (rectangular), and the vortex spiral guide rail 61 is protruding in a centripetal spiral shape on the surface of the driven wheel 6 perpendicular to the axis B, and the gaps between adjacent parts of the vortex spiral guide rail 61 form a vortex spiral guide groove 611.

[0103] The bottom of the centripetal pressure block 7 is provided with multiple arc grooves 711 matching the vortex spiral guide groove 611 at intervals, and each centripetal pressure block 7 is evenly distributed on the driven wheel 6 through its arc groove 711 correspondingly meshing with the vortex spiral guide groove 611; specifically, the bottom of the centripetal pressure block 7 is provided with multiple arc convex ribs 61 at intervals, and the bottom of the centripetal pressure block 7 forms multiple arc grooves 711 arranged at intervals in the length direction thereof in the gap between adjacent arc convex ribs 61, and the shape of the arc groove 711 matches the shape of the vortex spiral guide groove 611, through the continuous interval of multiple arc grooves The convex rib 61 meshes with a plurality of continuously spaced adjacent segments of the vortex spiral guide groove 611, and at the same time meshes with a plurality of continuously spaced adjacent segments of the vortex spiral guide rail 61 through a plurality of continuously spaced arc-shaped slide grooves 711, so that each centripetal pressure block 7 is radially (radially) evenly spaced and installed on the circumference of the vortex spiral guide groove 611, and when the driven wheel 6 rotates forward and reversely about a fixed axis, the vortex spiral guide groove 611 performs forward centripetal or reverse centrifugal spiral motion, driving each centripetal pressure block 7 to respectively move along the guide structure 81 (guide through groove) in a straight line centripetal or centrifugal manner perpendicular to the axis B, such as Figure 4 , 5 shown.

[0104] In the third embodiment of the tube pressing device F of the injection tube inner diameter adjustment system provided by the utility model (not shown in the figure), the driving assembly of the tube pressing device F includes:

[0105] At least three linear drive mechanisms are evenly spaced around the distribution axis B, and are respectively used to drive at least three extrusion cutter dies 74 to move centripetally along the radial straight lines of the injection tube 10 around the injection end 102 of the injection tube 10 .

[0106] In the third embodiment, the linear drive mechanism can use a linear drive mechanism such as a gear rack, a synchronous pulley, a screw nut or a driving cylinder to drive the extrusion die 74 to move linearly and centripetally.

[0107] In the common implementation of embodiments 1 to 3, the sample injection tube 10 is a metal sample injection tube 10 made of metal material and suitable for a small and portable mass spectrometer.

[0108] In a preferred implementation of Example 3, three or four linear drive mechanisms are provided, and correspondingly three or four extrusion cutter dies 74 are provided, and each extrusion cutter dies 74 are evenly spaced and distributed around the axis B of the injection tube 10 .

[0109] See also Figure 1 , 7 The utility model also provides a method for adjusting the inner diameter of the injection tube 10, which uses the above-mentioned injection tube inner diameter adjustment system and includes the following steps:

[0110] S1: Clamp the sample outlet end 103 of the sample injection tube 10 and align the sample injection hole 101 of the sample injection tube 10 with the delivery channel in a sealed manner; start the vacuum pump to evacuate the vacuum chamber 111;

[0111] S2: Detecting the real-time air pressure value in the vacuum chamber 111, and controlling the rotation speed of the vacuum pump 12 according to the real-time air pressure value to feedback-adjust the real-time air pressure value to the target air pressure value;

[0112] S3: Detect the real-time flow value of the sample passing through the delivery channel, and control the feeding stroke of the extrusion die 74 to extrude the sample injection tube 10 according to the real-time flow value to feedback adjust the real-time flow value to the target flow value.

[0113] See also Figure 7 In this embodiment, in S1, the sample outlet end 103 of the sample injection tube 10 can be clamped first and the sample injection hole 101 of the sample injection tube 10 can be sealed and aligned with the conveying channel, and then the vacuum pump can be started to evacuate the vacuum chamber 111; the vacuum pump can also be started to evacuate the vacuum chamber 111 first, and then the sample outlet end 103 of the sample injection tube 10 can be clamped and the sample injection hole 101 of the sample injection tube 10 can be sealed and aligned with the conveying channel; or both can be performed at the same time. In actual production, the vacuum pump can also be kept open, and when the vacuum degree set in the vacuum chamber 111 is reached, the sample injection tube 10 can be clamped in rotation to perform variable flow production.

[0114] See also Figure 1 , 5 Specifically, in S2, the sample outlet end 103 of the sample injection tube 10 is clamped in the first clamping cavity 211 of the tube clamp joint 21 by the clamping mechanism 22; in S2, the real-time air pressure value in the vacuum chamber 111 is detected by the vacuum gauge 13, and the real-time air pressure value is received by the central control device 9, and the rotation speed of the vacuum pump 12 is controlled according to the real-time air pressure value; in S3, the real-time flow value of the sample passing through the conveying channel is detected by the flow meter 4, and the real-time flow value is received by the central control device 9, and the feeding stroke of the extrusion die 74 for extruding the sample injection tube 10 is controlled according to the real-time flow value.

[0115] See also Figure 7 In this embodiment, in S2, controlling the speed of the vacuum pump 12 according to the real-time air pressure value to feedback-adjust the real-time air pressure value to the target air pressure value includes:

[0116] Determine the difference between the real-time air pressure value and the target air pressure value. If the real-time air pressure value is greater than the target air pressure value, control the vacuum pump 12 to increase the speed; if the real-time air pressure value is less than the target air pressure value, control the vacuum pump 12 to reduce the speed; repeat the above steps in S2 until it is determined that the real-time air pressure value is adjusted to the target air pressure value.

[0117] See also Figure 7Specifically, in S2, the central control device 9 receives the real-time air pressure value in the vacuum chamber 111 detected by the vacuum gauge 13, and determines the difference between the real-time air pressure value and the preset target air pressure value. If the real-time air pressure value is greater than the target air pressure value, it is determined that the real-time air pressure value is too large. At this time, the vacuum pump 12 is controlled to increase the speed, and the process returns to continue to determine the difference between the real-time air pressure value and the target air pressure value; if the real-time air pressure value is less than the target air pressure value, it is determined that the real-time air pressure value is too small. At this time, the vacuum pump 12 is controlled to reduce the speed, and the process returns to continue to determine the difference between the real-time air pressure value and the target air pressure value; repeat the above steps in S2 until it is determined that the real-time air pressure value is adjusted to the target air pressure value, and proceed to the next step S3.

[0118] See also Figure 7 In this embodiment, in S3, the feeding stroke of the extrusion die 74 for extruding the sample injection tube 10 is controlled according to the real-time flow value to feedback and adjust the real-time flow value to the target flow value, including:

[0119] The difference between the real-time flow value and the target flow value is determined. If the real-time flow value is greater than the target flow value, the extrusion die 74 is controlled to increase the feed stroke of the extruded sample injection tube 10, and the process returns to S2 and repeats the above steps in S3 until the real-time air pressure value is determined to be adjusted to the target air pressure value; if the real-time flow value is less than the target flow value, the sample injection tube 10 is determined to be a waste.

[0120] See also Figure 7 Specifically, in S3, the central control device 9 receives the real-time flow value of the sample passing through the conveying channel detected by the flow meter 4, and determines the difference between the real-time flow value and the target flow value. If the real-time flow value is greater than the target flow value, it is determined that the real-time flow value is too large. At this time, the extrusion die 74 is controlled to increase the feed stroke of the extruded sample tube 10, and the process returns to S2 and repeats the above steps in S3 until the real-time air pressure value is adjusted to the target air pressure value, and the sample tube 10 is marked as a finished product (qualified product) for the operator to classify, unload, store, and transport; if the real-time flow value is less than the target flow value, it is determined that the real-time flow value is too small, and then the sample tube 10 is determined to be a waste (defective product) for the operator to classify, unload, store, and transport.

[0121] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for adjusting the inner diameter of a sample injection tube, wherein the sample injection tube (10) is connected to a vacuum chamber (111) via a first connecting tube (3), characterized in that: The injection tube inner diameter adjustment system also includes: A clamping connection device (2) for clamping a sample outlet end (103) of a sample injection tube (10) and an input end (32) of a first connection tube (3), and sealing a connection between the sample injection tube (10) and the first connection tube (3); A flow meter (4) for detecting a real-time flow value of a sample input into the vacuum chamber (111) through the sample inlet tube (10); The tube pressing device (F) comprises at least three extrusion cutter dies (74) arranged on the peripheral side of the sample injection end (102) of the sample injection tube (10) and distributed along the circumference of the sample injection tube, and a driving assembly for driving the extrusion cutter dies (74) to move radially and centripetally along the sample injection tube (10); The central control device (9) controls the feeding stroke of the extrusion die (74) for extruding the sample injection tube (10) according to the difference between the real-time flow value and the target flow value.

2. The injection tube inner diameter adjustment system according to claim 1, characterized in that: The clamping connection device (2) comprises: A pipe clamp joint (21) comprising a first clamping cavity (211) and a second clamping cavity (212) which are arranged at two ends of the pipe clamp joint (21) opposite to each other, and a conveying channel (213) which passes through the first clamping cavity (211) and the second clamping cavity (212); and a clamping mechanism (22) for clamping the sample outlet end (103) and the input end (32) of the first connecting tube (3) in the first clamping cavity (211) and the second clamping cavity (212) respectively, and for sealingly connecting the sample injection hole (101) of the sample injection tube (10) and the first connecting hole (31) of the first connecting tube (3) through the delivery channel (213).

3. The injection tube inner diameter adjustment system according to claim 2, characterized in that: The first clamping cavity (211) comprises a first tapered hole (2111) provided at one end of the tube clamp joint (21), and a first sealing step (2112) provided at the bottom end of the first tapered hole (2111) close to the second clamping cavity (212); the second clamping cavity (212) comprises a threaded hole (2121) provided at the other end of the tube clamp joint (21), and a second tapered hole (2122) provided at the bottom end of the threaded hole (2121) close to the first clamping cavity (211), and a second tapered hole (2122) provided at the second tapered hole (2121) close to the bottom end of the first clamping cavity (211). The conical hole (2122) is close to a second sealing step (2123) at the bottom end of the first clamping cavity (211); the delivery channel (213) passes through the first sealing step (2112) and the second sealing step (2123); the sample outlet (103) and the input end (32) of the first connecting tube (3) are respectively in contact with the first sealing step (2112) and the second sealing step (2123), and the sample injection hole (101), the first connecting hole (31) and the delivery channel (213) are aligned; The clamping mechanism (22) comprises: A clamping nut (223) comprises a connecting portion (2231) sleeved on the outside of the input end (32) of the first connecting tube (3) and an opening portion (2232) provided at one end of the connecting portion, wherein the inner wall of the opening portion (2232) is screwed to the outside of one end of the pipe clamp joint (21); a first sleeve ring (221) sleeved on the outside of the sample outlet end (103) and located between the first tapered hole (2111) and the connecting portion (2231), wherein the first sleeve ring (221) is provided with a first tapered surface (2211) matching the shape of the first tapered hole (2111) on the outside of the end facing the first tapered hole (2111); a clamping screw ( 224), comprising a hollow nut portion (2241) and a hollow screw portion (2242) which are coaxially connected and sleeved on the outside of the input end (32) of the first connecting tube (3), the outer wall of the hollow screw portion (2242) being screwed on the inner wall of the threaded hole (2121); and a second sleeve ring (222), sleeved on the outside of the input end (32) of the first connecting tube (3) and located between the second tapered hole (2122) and the hollow screw portion (2242), the outer side of the second sleeve ring (222) facing the second tapered hole (2122) being provided with a second tapered surface (2221) matching the shape of the second tapered hole (2122); By tightening the clamping nut (223) and the clamping screw (224), the first conical surface (2211) and the second conical surface (2221) are respectively pressed against the corresponding inner walls of the first conical hole (2111) and the second conical hole (2122), so that the injection hole (101) and the first connecting hole (31) are sealed and connected through the delivery channel (213).

4. The injection tube inner diameter adjustment system according to claim 3, characterized in that: The output end (33) of the first connecting tube (3) is connected to the inlet end (41) of the flow meter (4), and the injection tube inner diameter adjustment system further includes: A second connecting tube (43), wherein the input end of the second connecting tube (43) is connected to the outlet end (42) of the flow meter (4), and the output end of the second connecting tube (43) is connected to the vacuum chamber (111).

5. The system for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 4, characterized in that: The drive assembly comprises: A drive shaft (5); A transmission member (51) is disposed on the driving shaft (5) and is used to drive the driven wheel (5) to rotate in a forward and reverse direction around its axis (B) under the drive of the driving shaft (5); A vortex spiral guide groove (511) is arranged in a centripetal spiral shape on a surface of the driven wheel (5) perpendicular to the axis (B); At least three guide structures (81) are evenly spaced around the distribution axis (B), and the guide structures (81) are perpendicular to the axis (B); At least three centripetal pressure blocks (7) are movably mounted on corresponding guide structures (81), and a plurality of arcuate slide grooves (711) matching the vortex spiral guide groove (511) are arranged at intervals at the bottom of the centripetal pressure blocks (7), and each centripetal pressure block (7) is evenly spaced and distributed on the driven wheel (5) by meshing with the vortex spiral guide groove (511) through the arcuate slide grooves (711); The extrusion die (74) is mounted on the centripetal pressure block (7), and the cutter head (741) of the extrusion die (74) faces the axis (B); When the injection end (102) is coaxial with the axis (B) and is located between the extrusion cutter dies (74), the driven wheel (5) is driven to rotate in a positive fixed axis direction, and then the centripetal pressing blocks (7) are driven by the vortex spiral guide groove (511) to move centripetally along the corresponding guide structure (81) perpendicular to the axis (B), thereby driving the extrusion cutter dies (74) to extrude the injection tube (10) in various directions.

6. The system for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 4, characterized in that: The drive assembly comprises: At least three linear drive mechanisms are evenly spaced around the distribution axis (B) and are respectively used to drive at least three extrusion cutter dies (74) to move centripetally along the radial straight lines of the sample injection tube (10) around the sample injection end (102).

7. The system for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 4, characterized in that: The sample injection tube (10) is made of metal, and three or four extrusion cutter dies (74) are provided, and the extrusion cutter dies (74) are evenly spaced and distributed around the axis (B) of the sample injection tube (10).

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