Sample injection pipe inner diameter adjusting device

Abstract

The utility model provides a device for adjusting the inner diameter of a sampling tube. The device comprises a driving shaft, the transmission part is arranged on the driving shaft and used for driving the driven wheel to rotate around the axis of the driven wheel in a fixed-axis mode under driving of the driving shaft. The vortex-shaped spiral guide groove is formed in the surface, perpendicular to the axis, of the driven wheel in a centripetal spiral shape; the at least three centripetal pressing blocks can be movably mounted in the vortex-shaped spiral guide groove at intervals along the vortex-shaped spiral guide groove; the extrusion cutting die is mounted on the centripetal pressing block, and a cutting head of the extrusion cutting die faces the axis; when the sample injection pipe is coaxial with the axial lead, the driven wheel is driven to rotate in a fixed-axis mode to drive the centripetal pressing blocks to do spiral centripetal precession along the vortex-shaped spiral guide grooves relative to the axial lead, and therefore the extrusion cutting dies are driven to extrude the sample injection pipe in all directions so as to deform and adjust the inner diameter of a sample injection hole of the sample injection pipe. After the large-inner-diameter metal sample injection pipe with lower manufacturing or purchasing processing cost is manufactured or purchased, the inner diameter of the sample injection pipe is quickly extruded and deformed by the inner diameter adjusting device to adjust the inner diameter of the sample injection pipe, so that the manufacturing cost of the metal sample injection pipe with the inner diameter meeting the specific vacuum requirement of a mass spectrum analyzer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mass spectrometry analysis, in particular to a device for adjusting the inner diameter of a sample injection tube. Background Art

[0002] In order to meet the high vacuum requirements of mass spectrometers, currently small and portable mass spectrometers generally use pinch valves, quartz capillaries or metal injection tubes to control the injection volume to ensure the high vacuum working environment of mass analysis instruments. The use of pinch valves will increase the complexity of the instrument structure, which is not conducive to the miniaturization and portability of the instrument, and the pinch valve hose needs to be frequently replaced, which increases maintenance costs. The quartz capillary has a smaller inner diameter, but its sealing connection with other pipelines needs to be converted, and the insufficient strength of the quartz capillary also limits its application range.

[0003] Therefore, small and portable mass spectrometers mostly use metal injection tubes with simple connection structures and high strength. 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 injection tube under atmospheric pressure, if the inner diameter of the metal injection tube is too large, its flow rate will increase, which will affect the vacuum environment and thus affect the stability and detection capability of the instrument. Large mass spectrometers are usually equipped with multi-stage vacuum chambers and high-power vacuum systems, while the vacuum system power of small and portable mass spectrometers is limited. It is difficult to meet the instrument use requirements in application scenarios where the aperture of the metal injection tube is too large and the vacuum environment needs to be maintained continuously for monitoring and analysis. Therefore, in order to ensure the stability and detection capability of the instrument, it is necessary to control the inner diameter of the injection hole of the metal injection tube to control its flow rate to match the vacuum level required for the application scenario of the mass spectrometer. 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, and the smaller the inner diameter of the metal injection tube, the higher its cost.

[0004] In summary, how to manufacture a metal sample injection tube with an inner diameter that meets the specific vacuum environment requirements of a mass spectrometer at a low cost is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0005] The utility model provides a sampling tube inner diameter adjustment device to solve the technical problem in the prior art that the manufacturing cost of a metal sampling tube with an inner diameter meeting the specific vacuum environment requirements of a mass spectrometer is high.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is:

[0007] The utility model provides a device for adjusting the inner diameter of a sample injection tube, comprising:

[0008] Drive shaft; a transmission member, arranged on the drive shaft, used to drive the driven wheel to rotate in a fixed direction around its axis under the drive shaft;

[0009] The vortex spiral guide groove is arranged in a centripetal spiral shape on the surface of the driven wheel perpendicular to the axis;

[0010] At least three guide structures are evenly spaced around the distribution axis and the guide structures point perpendicularly to the axis;

[0011] 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.

[0012] The extrusion die is installed on the centripetal pressure block, and the die head of the extrusion die faces the axis;

[0013] When the sampling tube is coaxial with the axis and located between each extrusion cutter 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 cutter die to extrude the sampling tube in each direction to deform and adjust the inner diameter of the sampling hole of the sampling tube.

[0014] Preferably, the transmission member is a driving bevel gear coaxially connected to the driving shaft, and the driven wheel is a driven bevel gear meshing with the driving bevel gear.

[0015] Preferably, the transmission member is a worm coaxially connected to the driving shaft, and the driven wheel is a turbine meshing with the worm.

[0016] Furthermore, the device for adjusting the inner diameter of the injection tube further comprises:

[0017] A support seat, a driven wheel is rotatably mounted inside the support seat, a driving shaft is rotatably mounted horizontally on one side end of the support seat and is connected to the driven wheel through a transmission member, and the axis is perpendicular to the central axis of the driving shaft;

[0018] A clearance hole coaxial with the axis is provided in the middle of the support seat, and at least three guide structures are evenly distributed around the axis at intervals on the top surface of the support seat and connected to the clearance hole;

[0019] When the sample injection tube is coaxial with the axis center line, the sample injection tube is passed through the clearance hole and is located between each extrusion cutter die to be extruded by each extrusion cutter die.

[0020] Preferably, the support seat is cylindrical, the guide structure is a guide groove provided on the top surface of the support seat and passing through the outer edge of the support seat and the clearance hole in the radial direction of the support seat, and the opposite inner side walls of the guide groove are respectively provided with a pair of support guide rails perpendicular to the axis;

[0021] The opposite outer side walls of the centripetal pressure block are respectively provided with a pair of connecting slide grooves matching the supporting guide rails. The centripetal pressure block is movably mounted on the corresponding guide through grooves in cooperation with the supporting guide rails through the connecting slide grooves.

[0022] Preferably, the support seat is provided with an annular cavity surrounding the support seat in a circumferential direction, one side end of the support seat is provided with a mounting hole connected to the annular cavity in a radial direction of the support seat, the drive shaft is rotatably inserted into the mounting hole, and the transmission member is provided at one end of the drive shaft extending into the annular cavity;

[0023] The driven wheel is an annular wheel whose appearance matches the annular cavity. The driven wheel is rotatably installed inside the annular cavity and supported on a support seat, and is also connected with the transmission member.

[0024] Furthermore, the sampling tube inner diameter adjustment device also includes:

[0025] The scale plate is arranged on the driving shaft, and the circumference of the scale plate is provided with scale lines and matching readings evenly spaced along the circumference of the scale plate, which are used to display the extrusion feed amount of the sample injection tube matching the rotation angle of the driving shaft relative to its initial position.

[0026] Preferably, the extrusion die is positioned and installed on the top of the centripetal pressing block by means of a clamping screw and a positioning pin.

[0027] Preferably, the extrusion die is in the shape of an elongated strip, the length direction of the extrusion die coincides with the radial direction of the driven wheel, the cutter head is an extrusion tip provided at one end of the length direction of the extrusion die, and the extrusion tip extends out of the centripetal pressure block close to the axis of the driven wheel along the radial direction of the driven wheel and points to the axis;

[0028] When the injection tube is coaxially arranged with the axis and the driven wheel is driven to rotate in a positive fixed direction, the extrusion tip moves linearly and centripetally perpendicular to the axis along the radial direction of the driven wheel driven by the vortex spiral guide groove, and the extrusion tip always keeps pointing to the axis during the linear centripetal movement.

[0029] Preferably, the sample inlet tube is made of metal, and three or four centripetal pressure blocks are provided.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] When the sampling tube inner diameter adjustment device provided by the utility model is used, it is only necessary to first manufacture or purchase a metal sampling tube with a larger inner diameter with a lower processing cost, and the inner diameter adjustment device then quickly and conveniently adjusts the inner diameter of the sampling tube by extrusion deformation. Compared with the metal sampling tube with a smaller inner diameter formed by direct machining, the sampling tube inner diameter adjustment device reduces the processing and manufacturing difficulty of the metal sampling tube with a smaller inner diameter, simplifies the manufacturing process, and reduces the manufacturing cost of the metal sampling tube with an inner diameter that meets the specific vacuum environment requirements of the mass spectrometer; at the same time, the sampling tube inner diameter adjustment device has a simple structure and low cost, and a dial is arranged on the driving shaft. When the dial rotates, by observing the corresponding scale line pointed to by the pointer tip and the matching reading, the extrusion feed amount of the sampling tube matching the rotation angle of the driving shaft relative to its initial rotation position can be displayed, thereby accurately controlling the extrusion deformation degree of the metal sampling tube, and then accurately adjusting the inner diameter of the metal sampling tube, so that the sampling flow through the metal sampling tube meets the vacuum environment requirements required by the specific application scenario of the mass spectrometer, and the continuous working stability and detection capability of the mass spectrometer are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A partial cross-sectional structural stereogram of the first embodiment of the device for adjusting the inner diameter of the sample injection tube provided by the utility model;

[0034] Figure 2 for Figure 1 A top view of the assembly structure of the sample injection tube inner diameter adjustment device without the support seat;

[0035] Figure 3 A partial cross-sectional structural stereogram of the second embodiment of the device for adjusting the inner diameter of the sample injection tube provided by the utility model;

[0036] Figure 4 for Figure 3 A stereoscopic diagram of the assembly structure of the sample injection tube inner diameter adjustment device after the support base is hidden;

[0037] Figure 5 for Figure 3 A bottom view of the assembly structure of the driven wheel, the driving member and the transmission member of the sampling tube inner diameter adjustment device;

[0038] Figure 6 A schematic diagram of a top view of the structure of the sample injection tube inner diameter adjustment device provided by the utility model using four centripetal pressing blocks and four extrusion cutter dies to achieve four-way extrusion;

[0039] Figure 7 It is a schematic diagram of the initial end surface structure of a metal sampling tube before being extruded and adjusted by the sampling tube inner diameter adjustment device provided by the utility model;

[0040] Figure 8 The utility model is a schematic diagram of the deformed end surface structure of a metal sampling tube after the sampling tube inner diameter adjustment device provided by the utility model is subjected to three-way and four-way extrusion adjustment.

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

[0042] 1. Driving shaft; 2. Transmission member; 21. Worm; 22. Active bevel gear; 3. Driven wheel; 31. Vortex spiral guide rail; 311. Vortex spiral guide groove; 32. Turbine; 33. Driven bevel gear; 34. Wheel inner hole; 4. Centripetal pressure block; 41. Arc convex rib; 411. Arc slide groove; 42. Positioning pin; 43. Connecting slide groove; 5. Extrusion die; 51. Cutter head; 6. Scale plate; 61. Scale line; 62. Reading; 7. Support seat; 71. Guide structure; 711. Support guide rail; 72. Make way hole; 73. Annular cavity; 74. Support base; 741. Lower annular groove; 75. Support top seat; 751. Upper annular groove; 76. Extension seat; 761. Worm mounting cavity; 77. Mounting through hole; 8. Compression screw; 9. Injection tube; 91. Injection hole.

[0043] Among them, the markings 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. 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 1-8 And embodiments, the utility model is further described in detail.

[0046] Please also read Figure 1-6 The utility model provides a device for adjusting the inner diameter of a sample injection tube, comprising:

[0047] The driving shaft 1 uses human power or mechanical power as a power input source to drive the driving shaft 1 to rotate around its central axis A, that is, the driving shaft 1 rotates in a fixed-axis direction around the central axis A of the driving shaft 1 in a positive and negative fixed-axis rotation direction; the transmission member 2 is arranged on the driving shaft 1, and is used to drive the driven wheel 3 to rotate around the axis B of the driven wheel 3 in a positive and negative fixed-axis rotation direction under the drive shaft 1, that is, the driven wheel 3 rotates in a positive and negative fixed-axis rotation direction around the axis B of the driven shaft in a positive and negative fixed-axis rotation direction; the vortex spiral guide groove 311 is arranged in a centripetal spiral shape on the surface of the driven wheel 3 perpendicular to the axis B, that is, one end of the vortex spiral guide groove 311 is close to the edge of the driven wheel 3, and the other end of the vortex spiral guide groove 311 extends in a centripetal spiral shape to the middle of the driven wheel 3;

[0048] At least three guide structures 71 are evenly spaced around the axis B of the driven wheel 3, and the extension direction of the guide structure 71 is perpendicular to the axis B; at least three centripetal pressure blocks 4 can be movably installed on the corresponding guide structures 71 along the guide structures 71, and a plurality of arc grooves 411 matching the vortex spiral guide groove 311 are arranged at intervals at the bottom of the centripetal pressure block 4, and each centripetal pressure block 4 is respectively engaged with a plurality of continuously spaced adjacent segments of the vortex spiral guide groove 311 through a plurality of arc grooves 411, so as to be evenly spaced on the driven wheel 3; an extrusion die 5 is installed on the centripetal pressure block 4, and the cutter head 51 at one end of the extrusion die 5 faces the axis B.

[0049] When the sampling tube 9 is coaxially arranged with the axis line B of the driven wheel 3 and located between each extrusion cutter die 5 by means of hand-held or mechanical clamping by an operator, the driving shaft 1 is driven by human or mechanical power to make a positive fixed-axis rotation around its axis line A, thereby driving the driven wheel 3 to rotate in a positive fixed-axis direction. At the same time, each centripetal pressing block 4 is driven by the positive centripetal spiral rotation movement of the vortex spiral guide groove 311 to move centripetally in a straight line perpendicular to the axis line B along the corresponding guide structure 71, thereby driving each extrusion cutter die 5 to squeeze the sampling tube 9 at uniform intervals on the circumference of the sampling tube 9 in each direction with a centripetal stroke matching the positive fixed-axis rotation angle of the driven wheel 3, thereby adjusting the inner diameter of the sampling hole 91 of the sampling tube 9 by extrusion deformation.

[0050] On the contrary, by driving the driving shaft 1 to make reverse fixed-axis rotation around its central axis A through human or mechanical power, the driven wheel 3 can be driven to rotate in the reverse fixed-axis, thereby driving each centrifugal pressing block 4 to move centrifugally along the corresponding guide structure 71 perpendicular to the axis line B under the drive of the reverse centrifugal spiral rotation movement of the vortex spiral guide groove 311, and then driving each extrusion die 5 to open and close at even intervals around the sampling tube 9 in each direction with a centrifugal stroke matching the reverse fixed-axis rotation angle of the driven wheel 3, thereby loosening the sampling tube 9 whose inner diameter of the sampling hole 91 has been squeezed and adjusted, so that the operator can hold or clamp the sampling tube 9 by a clamping device to take out the sampling tube 9.

[0051] In addition, after each extrusion die 5 moves centripetally relative to the axial line B in various directions and contacts the outer peripheral side of the metal sampling tube 9, it also plays a self-centering clamping function for the metal sampling tube 9. While extruding the metal sampling tube 9, the metal sampling tube 9 is clamped and positioned during the adjustment process to prevent the metal sampling tube 9 from falling.

[0052] See also Figure 1 , 2 In the first embodiment of the device for adjusting the inner diameter of the injection tube provided by the utility model:

[0053] The central axis A of the driving shaft 1 is perpendicular to the axis B of the driven wheel 3 but does not intersect. The transmission member 2 is a worm 21 coaxially connected to the driving shaft 1 , and the driven wheel 3 is a turbine 32 meshing with the worm 21 .

[0054] See also Figure 1 As a preferred implementation scheme of Example 1, the transmission member 2 is a left-handed or right-handed worm 21 with multiple helical teeth (not shown in the figure), and the dividing surface of the worm 21 is a cylindrical surface. The driven wheel 3 is a turbine 32 (gear) with a plurality of teeth (not shown in the figure) arranged radially (radially) along the circumference of the rim and matching the helical teeth of the worm 21. The transmission member 2 (worm 21) and the driven member (turbine 32) coaxially mounted on the drive shaft 1 are meshed with each other, thereby forming a worm transmission mechanism of a gear pair with staggered axes (i.e., the axis B of the drive shaft 1 and the driven wheel 3 that are perpendicular to each other).

[0055] See also Figure 1 As a more preferred implementation of Example 1, the worm 21 adopts an Archimedean worm 21, and the worm 21 adopts a smaller helix angle, that is, the reverse stroke of the worm 21 is self-locking, so that the transmission member 2 (worm 21) can only drive the driven wheel 3 (turbine 32) to rotate with a positive stroke, and the driven wheel 3 (turbine 32) cannot in turn drive the transmission member 2 (worm 21) to rotate with a reverse stroke, thereby achieving the self-locking function of the driven wheel 3 (turbine 32), avoiding the adjustment process due to the driven wheel 3 (turbine 32) rotating under the influence of external force, causing each extrusion cutter dies 5 to centrifugally move in each direction relative to the axis B of the driven wheel 3, causing the metal sampling tube 9 to loosen and fall from between each extrusion cutter dies 5.

[0056] Please also read Figure 3-5 In the second embodiment of the device for adjusting the inner diameter of the injection tube provided by the utility model:

[0057] The center axis A of the driving shaft 1 is perpendicular to and intersects with the axis B of the driven wheel 3. The transmission member 2 is a driving bevel gear 22 coaxially connected to the driving shaft 1, and the driven wheel 3 is a driven bevel gear 33 meshing with the driving bevel gear 22. The transmission member 2 (driving bevel gear 22) and the driven member (driven bevel gear 33) coaxially mounted on the driving shaft 1 are meshed with each other, thereby forming a gear transmission mechanism of a gear pair with staggered axes (i.e., the axis B of the driving shaft 1 and the driven wheel 3 are perpendicular to each other).

[0058] To adjust the inner diameter of the metal injection tube 9 using the injection tube inner diameter adjustment device provided by the utility model, it is only necessary to first manufacture or purchase a metal injection tube 9 with a larger inner diameter and a lower processing cost, and then operate the injection tube inner diameter adjustment device in the above steps to quickly, conveniently and flexibly adjust the inner diameter of the injection tube 9 by extrusion deformation. Compared with the metal injection tube 9 with a smaller inner diameter formed by direct machining, the injection tube inner diameter adjustment device provided by the utility model reduces the difficulty of processing and manufacturing the metal injection tube 9 with a smaller inner diameter, simplifies the manufacturing process, and thus reduces the manufacturing cost of the metal injection tube 9 with an inner diameter that meets the specific vacuum environment requirements of the mass spectrometer. At the same time, the injection tube inner diameter adjustment device has the advantage of a simple structure, and also reduces the manufacturing cost of the metal injection tube 9 with a smaller inner diameter.

[0059] Please also read Figure 1-4 As a common implementation method of embodiments 1 and 2, the device for adjusting the inner diameter of the injection tube further includes:

[0060] A bearing seat (not shown in the figure), the driving shaft 1 is rotatably mounted horizontally on the bearing seat, that is, the central axis A of the driving shaft 1 is set horizontally; a support seat 7, the driven wheel 3 is rotatably mounted inside the support seat 7, and the driven wheel 3 is set horizontally, that is, the plane where the driven wheel 3 is located (the plane where the driven wheel 3 is located when the driven wheel 3 rotates on a fixed axis) is a horizontal plane parallel to the driving shaft 1; the vortex spiral guide groove 311 is arranged in a centripetal spiral shape on the upper surface (that is, the horizontal top surface) of the driven wheel 3 perpendicular to the axis B, so that each centripetal pressure block 4 of the driven wheel 3 and the extrusion die 5 installed thereon are stably mounted in the vortex spiral guide groove 311 on the horizontal top surface of the driven wheel 3; the driving shaft 1 is rotatably mounted horizontally on one side end of the support seat 7, and is connected to the driven wheel 3 through the transmission member 2, and the axis B of the driven wheel 3 is perpendicular to the central axis A of the driving shaft 1 (in the first embodiment, the central axis A does not intersect with the axis B, as shown in the embodiment 1). Figure 1 , 2 As shown; in the second embodiment, the central axis A intersects the axis line B, as shown Figure 3-5 As shown), that is, the axis B is set vertically; a clearance hole 72 coaxial with the axis B is provided in the middle of the support seat 7, and at least three guide structures 71 are evenly distributed on the top surface of the support seat 7 around the axis B, and each of the three guide structures 71 corresponds to and connects to the clearance hole 72.

[0061] When the injection tube 9 is coaxial with the axis B of the driven wheel 3 , the injection tube 9 vertically penetrates the clearance hole 72 in the middle of the support seat 7 and is located between the corresponding cutter heads of each extrusion die 5 for extrusion by each extrusion die 5 .

[0062] Please also read Figure 1-4 As a preferred implementation method common to Examples 1 and 2, the support seat 7 is cylindrical, and the guide structure 71 is a guide groove provided on the top surface of the support seat 7 and radially penetrating the outer edge of the support seat 7 and the clearance hole 72 of the support seat 7. The relative inner side walls of the guide groove (guide structure 71) are respectively provided with a pair of support rails 711 perpendicular to the axis B; the relative outer side walls of the centripetal pressure block 4 are respectively provided with a pair of connecting grooves 43 matching the support rails 711, and the centripetal pressure block 4 is movably mounted on the corresponding guide groove (guide structure 71) through its pair of connecting grooves 43 corresponding to the pair of support rails 711.

[0063] As other implementation methods common to Examples 1 and 2, the pair of supporting guide rails 711 of the guiding structure 71 may also be replaced by a pair of supporting guide grooves (not shown in the figure), and the pair of connecting slide grooves 43 of the corresponding centripetal pressure block 4 may be replaced by a pair of connecting sliders (not shown in the figure) that cooperate with the supporting guide grooves.

[0064] Please also read Figure 1 , 3 4. As a more preferred implementation method common to embodiments 1 and 2, an annular cavity 73 surrounding the circumference of the support seat 7 is provided inside the support seat 7, and a mounting hole 77 connecting the annular cavity 73 along the radial direction of the support seat 7 is provided on one side end of the support seat 7, and the driving shaft 1 is rotatably inserted into the mounting hole 77, and the transmission member 2 is arranged at one end of the driving shaft 1 extending into the annular cavity 73; the driven wheel 3 is an annular wheel whose appearance matches the annular cavity 73, and a wheel inner hole 34 is provided in the middle of the annular wheel driven wheel 3, and the driven wheel 3 is rotatably installed inside the annular cavity 73 and supported on the support seat 7, at which time the annular cavity 73 surrounds the wheel inner hole 34 and the outer circumference of the driven wheel 3, that is, the wheel inner hole 34 is coaxial with the axis B, and at the same time, the driven wheel 3 is connected with the transmission member 2 in the annular cavity 73.

[0065] When adjusting the inner diameter of the injection hole 91 of the longer injection tube 9, the injection tube 9 is vertically and coaxially inserted into the clearance hole 72 of the support seat 7, so that the bottom end of the injection tube 9 extends downward into the clearance hole 72 to make way for the injection tube 9 to avoid interference, and the top end of the injection tube 9 passes upward between the corresponding cutter heads of each extrusion die 5 and extends above the horizontal plane where each extrusion die 5 is located. At the same time, the longer metal injection tube 9 can be moved up and down in the clearance hole 72, thereby adjusting the position of each extrusion die 5 in the length direction of the metal injection tube 9, so as to flexibly adjust the inner diameter size of the injection hole 91 and the injection flow rate at the specific length position of the metal injection tube 9 according to the actual application scenario, such as Figure 1 , 3 , as shown in Figure 4.

[0066] See also Figure 1 In the first embodiment, an extension seat 76 protruding horizontally outward is provided on one side of the support seat 7, and a worm mounting cavity 761 communicating with the annular cavity 73 is provided inside the extension seat 76. A mounting through hole 77 is provided on one side of the extension seat 76 and is parallel to the radially connected worm mounting cavity 761 of the support seat 7. The drive shaft 1 is rotatably inserted into the mounting through hole 77. The transmission member 2 (worm 21) is provided at one end of the drive shaft 1 extending into the worm mounting cavity 761 and meshes with the driven wheel 3 in the annular cavity 73.

[0067] See also Figure 3 , 4 As a better implementation method common to embodiments one and two, the support seat 7 includes a support base 74 and a support top seat 75, both of which are cylindrical. The top of the support base 74 is provided with a lower annular groove 741 surrounding its circumferential direction, and the top edge of the lower annular groove 741 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 75 is provided with an upper annular groove 751 surrounding its circumferential direction and matching the lower annular groove 741.

[0068] During assembly, the bottom surface of the driven wheel 3 is first supported on the top surface of the supporting slide rail, and then the supporting base 74 and the supporting top seat 75 are connected up and down by screws to form a cylindrical supporting seat 7. When the supporting base 74 and the supporting top seat 75 are connected up and down, the upper annular groove 751 and the lower annular groove 741 are simultaneously connected up and down to form the above-mentioned annular cavity 73 that wraps the driven wheel 3, so that the bottom surface of the driven wheel 3 can be rotatably installed in the annular cavity 73 by sliding with the supporting slide rail located in the annular cavity 73. Figure 3 shown.

[0069] As other implementation methods common to Examples 1 and 2 (not shown in the figures), the driven wheel 3 can also be rotatably installed inside the support seat 7 by cooperating with a bearing (not shown in the figures) provided at the bottom of the clearance hole 72 of the support seat 7.

[0070] As a preferred implementation scheme common to Examples 1 and 2, the drive shaft 1 uses a manually operated handle (not shown in the figure), a knob (not shown in the figure) or a wheel (not shown in the figure) as a power input source, or is connected to the output shaft of a drive motor (not shown in the figure) as a power input source.

[0071] See also Figure 1 , 2 As a preferred implementation method common to the first and second embodiments, the device for adjusting the inner diameter of the injection tube further includes:

[0072] The dial 6 is coaxially arranged on the driving shaft 1 and rotates synchronously with the driving shaft 1. The circumferential side of the dial 6 is provided with scale lines 61 and matching readings 62 evenly spaced along the circumference of the dial 6, which are used to display the extrusion feed amount of the sampling tube 9 matching the rotation angle of the driving shaft 1 relative to its initial position.

[0073] See also Figure 1 , 2 As a better implementation method common to Examples 1 and 2, the dial 6 is installed on the drive shaft 1 near the bearing seat, and the bearing seat is provided with a pointer (not shown in the figure) extending to the top of the vertically arranged dial 6 and pointing to the scale line 61 on the circumferential side of the dial 6. The tip of the pointer is always located above the rotation path of the scale line 61 when the dial 6 rotates with the drive shaft 1.

[0074] The device for adjusting the inner diameter of the sampling tube provided by the utility model is also provided with a dial 6 on the driving shaft 1. When the dial 6 rotates with the driving shaft 1, the corresponding scale line 61 (with the initial rotation position of the driving shaft 1 as the starting scale) and the matching reading 62 on the circumferential side of the dial 6 pointed to by the pointer tip can be observed, and the extrusion feed amount of the sampling tube 9 matching the rotation angle of the driving shaft 1 relative to its initial position can be displayed in real time, thereby accurately controlling the extrusion deformation degree of the metal sampling tube 9, and then accurately adjusting the inner diameter of the metal sampling tube 9, so that the sampling flow rate through the metal sampling tube 9 meets the vacuum environment requirements required by the specific application scenario of the mass spectrometer, thereby ensuring the continuous working stability and detection capability of the mass spectrometer.

[0075] Please also read Figure 1-4As a preferred embodiment of the first and second embodiments, the top of the centripetal pressing block 4 is provided with a threaded mounting hole (not shown in the figure) and a positioning pin 42, and the extrusion die 5 is provided with a screw connection hole and a pin connection hole matching the threaded mounting hole and the positioning pin 42. The pressing screw 8 passes through the corresponding screw connection hole and threaded mounting hole, and the positioning pin 42 passes through the corresponding pin connection hole, so that the extrusion die 5 is accurately positioned and installed on the top of the centripetal pressing block 4. When the extrusion die 5 is worn or damaged, or when the inner diameter of the metal sample injection tube 9 of a specific model and specification needs to be adjusted by extrusion, the extrusion die 5 can be quickly disassembled and replaced by disassembling the pressing screw 8, thereby improving the efficiency of adjusting the inner diameter of the metal sample injection tube 9.

[0076] Please also read Figure 1-4 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 on the top of the centripetal pressure block 4, and the extrusion die 5 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 clamping screw 8 passes through the corresponding threaded connection hole and the threaded mounting hole, and a pair of positioning pins 42 pass through the corresponding pin shaft connection hole and the pin mounting hole, respectively, so that the extrusion die 5 is positioned and fastened to the top of the centripetal pressure block 4 with higher precision.

[0077] Please also read Figure 1-4 As a preferred embodiment of the first and second embodiments, the extrusion die 5 is in the shape of a long strip, the length direction of the extrusion die 5 coincides with the radial direction of the driven wheel 3, the cutter head 51 is an extrusion tip provided at one end of the length direction of the extrusion die 5, and the extrusion tip extends out of the centripetal pressure block 4 along the radial direction of the driven wheel 3 close to the axis B of the driven wheel 3 and points to the axis B. The die movement direction E of the extrusion die 5 is to move toward or away from the axis B along the radial direction of the driven wheel 3 corresponding to the positive centripetal or reverse centrifugal spiral movement of the vortex spiral guide groove 311.

[0078] When the sampling tube 9 is coaxially arranged with the axis B and the driven wheel 3 is driven to rotate in the positive fixed axis, the extrusion tip (cutter head 51) is driven by the positive centripetal spiral motion of the vortex spiral guide groove to move linearly and centripetally perpendicular to the axis B along the radial direction of the driven wheel 3, and the extrusion tip (cutter head 51) always keeps pointing to the axis B during the linear centripetal motion, thereby ensuring that each extrusion cutter die 5 uniformly and centripetally extrude the metal sampling tube 9 in all directions on the circumference of the metal sampling tube 9, avoiding uneven extrusion caused by eccentric contact between the extrusion tip (cutter head 51) and the outer circumference of the metal sampling tube 9, resulting in the shape and inner diameter of the sampling hole 91 after deformation and adjustment being unable to meet the use requirements.

[0079] See also Figure 1-4 6, as a preferred embodiment common to the first and second embodiments, the centripetal pressure block 4 is provided with three (such as Figure 2 as shown) or four (as shown Figure 6 As shown in FIG. 1 , three or four centripetal pressing blocks 4 are radially (radially) evenly spaced and installed on the circumference of the vortex spiral guide groove 311, so that the inner diameter adjustment device of the sampling tube can realize three-way or four-way extrusion of the metal sampling tube 9 in three or four directions on the circumference of the metal sampling tube 9 through three or four extrusion die dies 5, respectively. The end surface structure of the metal sampling tube 9 and the inner diameter change of the sampling hole 91 before and after the extrusion are shown in FIG. Figure 7 , 8 shown.

[0080] Please also read Figure 1-4 As a preferred implementation scheme common to Examples 1 and 2, the centripetal pressure block 4 is rectangular (rectangular), and the vortex spiral guide rail 31 is protruding in a centripetal spiral shape on the surface of the driven wheel 3 perpendicular to the axis B, and the gaps between adjacent parts of the vortex spiral guide rail 31 form a vortex spiral guide groove 311.

[0081] The bottom of the centripetal pressure block 4 is provided with multiple arc grooves 411 matching the vortex spiral guide groove 311 at intervals, and each centripetal pressure block 4 is evenly distributed on the driven wheel 3 through its arc groove 411 correspondingly meshing with the vortex spiral guide groove 311; specifically, the bottom of the centripetal pressure block 4 is provided with multiple arc convex ribs 41 at intervals, and the bottom of the centripetal pressure block 4 forms multiple arc grooves 411 arranged at intervals in the length direction thereof in the gap between adjacent arc convex ribs 41, and the shape of the arc groove 411 matches the shape of the vortex spiral guide groove 311, through the continuous intervals of multiple arc grooves The convex rib 41 meshes with a plurality of continuously spaced adjacent segments of the vortex spiral guide groove 311, and at the same time meshes with a plurality of continuously spaced adjacent segments of the vortex spiral guide rail 31 through a plurality of continuously spaced arc-shaped slide grooves 411, so that each centripetal pressure block 4 is radially (radially) evenly spaced and installed on the circumference of the vortex spiral guide groove 311, and when the driven wheel 3 rotates forward and reversely, the vortex spiral guide groove 311 performs forward centripetal or reverse centrifugal spiral motion, driving each centripetal pressure block 4 to respectively move along the guide structure 71 (guide through groove) perpendicular to the axis B in a straight line centripetal or centrifugal motion, such as Figure 1 , 3 , as shown in Figure 4.

[0082] As a preferred implementation mode common to the first and second embodiments, the sample injection tube 9 is a metal sample injection tube 9 made of metal material and suitable for a small and portable mass spectrometer.

[0083] 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 device for adjusting the inner diameter of a sample injection tube, characterized in that: include: A drive shaft (1); A transmission member (2) is arranged on the driving shaft (1) and is used to drive the driven wheel (3) to rotate in a forward and reverse direction around its axis (B) under the drive of the driving shaft (1); A vortex spiral guide groove (311) is arranged in a centripetal spiral shape on a surface of the driven wheel (3) perpendicular to the axis (B); At least three guide structures (71) are evenly spaced around the distribution axis (B), and the guide structures (71) are perpendicular to the axis (B); At least three centripetal pressure blocks (4) are movably mounted on corresponding guide structures (71), and a plurality of arc-shaped slide grooves (411) matching the vortex spiral guide groove (311) are arranged at intervals at the bottom of the centripetal pressure blocks (4), and each centripetal pressure block (4) is evenly spaced and distributed on the driven wheel (3) by meshing with the vortex spiral guide groove (311) through the arc-shaped slide grooves (411); An extrusion die (5) is mounted on the centripetal pressure block (4), and a cutter head (51) of the extrusion die (5) faces the axis (B); When the sample injection tube (9) is coaxial with the axis (B) and is located between the extrusion cutter dies (5), the driven wheel (3) is driven to rotate in a positive fixed axis direction, and then the centripetal pressing blocks (4) are driven by the vortex spiral guide groove (311) to move centripetally along the corresponding guide structure (71) perpendicular to the axis (B), thereby driving the extrusion cutter dies (5) to squeeze the sample injection tube (9) in various directions to deform and adjust the inner diameter of the sample injection hole (91) of the sample injection tube (9).

2. The device for adjusting the inner diameter of the sample injection tube according to claim 1, characterized in that: The transmission member (2) is a driving bevel gear (22) coaxially connected to the driving shaft (1), and the driven wheel (3) is a driven bevel gear (33) meshing with the driving bevel gear (22).

3. The device for adjusting the inner diameter of the sample injection tube according to claim 1, characterized in that: The transmission member (2) is a worm (21) coaxially connected to the drive shaft (1), and the driven wheel (3) is a turbine (32) meshing with the worm (21).

4. The device for adjusting the inner diameter of the sample injection tube according to claim 1, characterized in that: Also includes: A support seat (7), the driven wheel (3) is rotatably mounted inside the support seat (7), the drive shaft (1) is rotatably mounted horizontally on one side end of the support seat (7), and is connected to the driven wheel (3) through a transmission member (2), and the axis (B) is perpendicular to the center axis (A) of the drive shaft (1); The support seat (7) is provided with a clearance hole (72) coaxial with the axis (B) in the middle, and at least three guide structures (71) are evenly spaced and distributed around the axis (B) on the top surface of the support seat (7) and connected to the clearance hole (72); When the sample injection tube (9) is coaxial with the axis (B), the sample injection tube (9) is inserted into the clearance hole (72) and is located between each extrusion die (5) so as to be extruded by each extrusion die (5).

5. The device for adjusting the inner diameter of the sample injection tube according to claim 4, characterized in that: The support seat (7) is cylindrical, the guide structure (71) is a guide groove provided on the top surface of the support seat (7) and passing through the outer edge of the support seat (7) and the clearance hole (72) in the radial direction of the support seat (7), and the opposite inner side walls of the guide groove are respectively provided with a pair of support guide rails (711) perpendicular to the axis (B); The relative outer side walls of the centripetal pressure block (4) are respectively provided with a pair of connecting grooves (43) matching the supporting guide rail (711), and the centripetal pressure block (4) is movably mounted on the corresponding guide groove by cooperating with the supporting guide rail (711) through the connecting grooves (43).

6. The device for adjusting the inner diameter of the sample injection tube according to claim 5, characterized in that: The support seat (7) is provided with an annular cavity (73) surrounding the support seat (7) in a circumferential direction. A mounting through hole (77) is provided at one side end of the support seat (7) and is connected to the annular cavity (73) in a radial direction of the support seat (7). The drive shaft (1) is rotatably inserted into the mounting through hole (77). The transmission member (2) is provided at one end of the drive shaft (1) extending into the annular cavity (73). The driven wheel (3) is an annular wheel whose shape matches the annular cavity (73). The driven wheel (3) is rotatably installed inside the annular cavity (73) and supported by the support seat (7), and is also connected to the transmission member (2).

7. The device for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 6, characterized in that: Also includes: A scale plate (6) is arranged on the driving shaft (1), and scale lines (61) and matching readings (62) are arranged on the circumference of the scale plate (6) at evenly spaced intervals along the circumference of the scale plate (6) for displaying the extrusion feed amount of the sample injection tube (9) matching the rotation angle of the driving shaft (1) relative to its initial position.

8. The device for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 6, characterized in that: The extrusion die (5) is positioned and installed on the top of the centripetal pressure block (4) by means of a clamping screw (8) and a positioning pin (42).

9. The device for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 6, characterized in that: The extrusion die (5) is in the shape of an elongated strip, the length direction of the extrusion die (5) coincides with the radial direction of the driven wheel (3), the cutter head (51) is an extrusion tip disposed at one end of the length direction of the extrusion die (5), and the extrusion tip extends out of the centripetal pressure block (4) along the radial direction of the driven wheel (3) close to the axis (B) of the driven wheel (3) and points to the axis (B); When the sample injection tube (9) is coaxially arranged with the axis centerline (B) and drives the driven wheel (3) to rotate in a positive fixed axis direction, the extrusion tip moves linearly and centripetally perpendicular to the axis centerline (B) along the radial direction of the driven wheel (3) driven by the vortex spiral guide groove (311), and the extrusion tip always keeps pointing to the axis centerline (B) during the linear centripetal movement.

10. The device for adjusting the inner diameter of a sample injection tube according to any one of claims 1 to 6, characterized in that: The sample injection tube (9) is made of metal, and three or four centripetal pressing blocks (4) are provided.

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