Multi-channel sample target-changing sampling device

Abstract

The utility model relates to the technical field of mass spectrometers, and discloses a multichannel sample target-changing sampling device, which comprises a power mechanism, a transverse supporting seat, a reversing mechanism and a sample loading platform, the transverse supporting seat is connected with the output end of the power mechanism, the power mechanism is used for driving the transverse supporting seat to move along the Y-axis direction, and the sample loading platform is arranged on the reversing mechanism; the reversing mechanism comprises a reversing track and a reversing base plate arranged on the transverse supporting seat in a sliding manner, a reversing wheel is arranged on the outer edge of the reversing base plate, and when the reversing wheel slides along the reversing track, the reversing base plate can move in the X-axis direction relative to the transverse supporting seat, so that the positions of sample points on a sample target plate of the sample loading platform can be moved. The power mechanism is used for driving the sample loading platform to move in the Y-axis direction so as to achieve target entering and exiting, the reversing mechanism is used for driving the sample loading platform to move in the X-axis direction so as to achieve target changing, only a single power source is used for driving, occupied space is small, cost is low, equipment debugging and human factor interference are reduced, and the equipment failure rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mass spectrometers, and more specifically to a multi-channel sample-target-changing sampling device. Background Art

[0002] The position of the flight trajectory of charged particles in the mass spectrometer remains unchanged, so samples located at different positions on the sample target plate need to be sampled by moving the motion platform.

[0003] Existing mass spectrometers often use an XY cross-motion platform as their motion platform. This involves positioning the fixed end of one of the X-axis and Y-axis platforms on the movable end of the other, enabling detection of different sample points within the XY plane. This dual-powered linkage design is costly, requires numerous components, and is complex to install and debug. This approach also results in a low target utilization rate and occupies a large space, resulting in an excessively large mass spectrometer vacuum chamber and low vacuum efficiency.

[0004] In summary, how to reduce the cost and volume of the motion platform is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a multi-channel target-changing sampling device that is driven by a single power source, occupies a small space, has low equipment cost, and reduces equipment debugging and interference from human factors, thereby reducing equipment failure rate.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A multi-channel sample target exchange sampling device includes a power mechanism, a transverse support seat, a reversing mechanism and a sample loading platform, wherein the transverse support seat is connected to the output end of the power mechanism, the power mechanism is used to drive the transverse support seat to move along the Y-axis direction, and the sample loading platform is installed on the reversing mechanism;

[0008] The reversing mechanism includes a reversing track and a reversing substrate slidably arranged on the transverse support seat. A reversing wheel is provided on the outer edge of the reversing substrate. When the reversing wheel slides along the reversing track, the reversing substrate can move relative to the transverse support seat along the X-axis direction so as to move the positions of each sample point on the sample target plate of the sample loading platform. The X-axis direction is not parallel to the Y-axis direction.

[0009] Preferably, a reversing wheel is provided on each of the left and right sides of the reversing substrate, and the two reversing wheels are respectively provided at the front and rear ends of the reversing substrate, and the two reversing wheels are used to drive the reversing substrate to reciprocate along the X-axis direction relative to the transverse support seat.

[0010] Preferably, the outer edge of the reversing substrate is provided with at least two connected limiting grooves, and the lateral support seat is provided with a limiting plunger for cooperating with the limiting grooves. When the limiting plunger is clamped in the limiting groove, a corresponding column of sample points on the sample target plate is arranged opposite the collection position.

[0011] Preferably, one end of the limiting plunger relatively close to the limiting groove is spherical, so as to reduce the friction between the limiting plunger and the limiting groove.

[0012] Preferably, the commutation substrate is provided with at least three insulating support columns, the sliding sleeves inside the insulating support columns are provided with target positioning columns, and the target positioning columns are connected to the insulating support columns by circumferentially arranged fasteners to fix the relative positions of the target positioning columns and the insulating support columns;

[0013] An electrode sheet is provided between the target positioning column and the insulating support column, and the top end of the target positioning column is clamped in the sample target plate.

[0014] Preferably, the target positioning posts are symmetrically arranged about a symmetry plane of the sample target plate along the Y-axis direction, at least two of the target positioning posts are arranged on the left and right sides of the sample target plate, and the top ends of the target positioning posts arranged on both sides of the sample target plate are provided with a truncated cone-shaped mating portion, and the sample target plate is provided with a conical hole for mating with the mating portion.

[0015] Preferably, the power mechanism includes a driving motor, a trapezoidal screw along the Y-axis direction and a screw nut sleeved on the outside of the trapezoidal screw, one end of the trapezoidal screw is connected to the output shaft of the driving motor, and the other end of the trapezoidal screw is installed in the support seat through a bearing and a limit spring, and the screw nut is connected to the lateral support seat.

[0016] Preferably, photoelectric switches are provided at both ends of the trapezoidal lead screw, and when the lead screw nut moves to the end of the trapezoidal lead screw, the photoelectric switch outputs a position signal.

[0017] Preferably, a guide rail slider is provided at the bottom of the transverse support seat, and the guide rail slider is slidably installed on a linear guide rail on the bottom surface of the vacuum chamber, and the linear guide rail is arranged along the Y-axis direction.

[0018] Preferably, the reversing track includes a reversing portion and a connecting portion, the reversing portion is arranged toward the reversing substrate, and the connecting portion is arranged on the inner side surface of the vacuum chamber through a fastener.

[0019] The multi-channel sample target changing sampling device provided by the present invention utilizes a power mechanism to drive the sample loading platform to move back and forth along the Y-axis direction to realize the entry and exit of the sample in the target, and utilizes a reversing mechanism to drive the sample loading platform to move along the X-axis direction to realize the target changing of the sample. Since only a single power source is used for driving, the multi-channel sample target changing sampling device occupies a small space, has a low equipment cost, reduces equipment debugging and interference from human factors, and effectively reduces the equipment failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of a specific embodiment of the multi-channel sample target replacement sampling device provided by the utility model;

[0022] Figure 2 for Figure 1 Schematic top view of

[0023] Figure 3 It is a structural diagram of the power mechanism;

[0024] Figure 4 It is a structural diagram of the lateral support seat and the sample loading platform;

[0025] Figure 5 Schematic diagram of the connection between the sample target plate and the commutation substrate;

[0026] Figure 6 for Figure 5 A partial cross-sectional view of

[0027] Figure 7 Schematic diagram of the structure of the sample target plate;

[0028] Figure 8 It is a structural diagram of the reversing mechanism;

[0029] Figure 9 It is a structural diagram of the commutation track;

[0030] Figure 10 for Figure 9 The main schematic diagram of

[0031] Figure 11 for Figure 10 Schematic cross-sectional view in the AA direction;

[0032] Figure 12It is a schematic diagram of the assembly of the limiting groove and the limiting plunger;

[0033] Figure 13 Schematic diagram of the assembly of the multi-channel sample target changing sampling device in the vacuum chamber.

[0034] Figures 1-13 middle:

[0035] 1-power mechanism; 11-vacuum motor; 12-motor mounting plate; 13-trapezoidal lead screw; 14-screw nut; 15-bearing; 16-support seat; 17-photoelectric switch; 2-lateral support seat; 21-limit plunger; 22-guide rail slider; 23-linear guide rail; 3-reversing mechanism; 31-reversing substrate; 311-limiting groove; 32-reversing wheel; 33-reversing track; 34-micro guide rail slider; 4-sample loading platform; 41-sample target plate; 411-conical hole; 42-target positioning column; 421-adjustment positioning hole; 43-electrode sheet; 44-insulating support column; 5-vacuum chamber. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The core of the utility model is to provide a multi-channel target-changing sampling device, which is driven by a single power source, occupies a small space, has low equipment cost, and reduces equipment debugging and human interference, thereby reducing equipment failure rate.

[0038] The multi-channel sample target exchange sampling device provided by the present invention includes a power mechanism 1, a transverse support seat 2, a reversing mechanism 3 and a sample loading platform 4. The transverse support seat 2 is connected to the output end of the power mechanism 1. The power mechanism 1 is used to drive the transverse support seat 2 to move along the Y-axis direction. The sample loading platform 4 is installed on the reversing mechanism 3;

[0039] The reversing mechanism 3 includes a reversing track 33 and a reversing substrate 31 slidably arranged on the transverse support seat 2. A reversing wheel 32 is provided on the outer edge of the reversing substrate 31. When the reversing wheel 32 slides along the reversing track 33, the reversing substrate 31 can move relative to the transverse support seat 2 along the X-axis direction so as to move the position of each sample point on the sample target plate 41 of the sample loading platform 4. The X-axis direction is not parallel to the Y-axis direction. In order to facilitate the motion control of the sampling device, it is preferably set that the X-axis direction and the Y-axis direction are orthogonal to each other in the bottom surface of the vacuum chamber 5.

[0040] Among them, the power mechanism 1 serves as the power source of the sample target changing sampling device. It can directly drive the horizontal support seat 2 to drive the reversing mechanism 3 and the sample loading platform 4 arranged thereon to move along the Y-axis direction, thereby completing the target entry and exit of the sample target plate 41, and can also drive the reversing substrate 31 and the sample loading platform 4 arranged thereon to move along the X-axis direction through the cooperation of the reversing wheel 32 and the reversing track 33, thereby realizing the sample target changing operation.

[0041] The power mechanism 1 can be set as a linear transmission mechanism such as a driving motor and a trapezoidal screw mechanism, a guide rail slider mechanism, etc.; it should be noted that in order to accurately align the sample point and the collection position on the sample target plate 41 of the sample loading platform 4 to ensure the sampling quality, the power mechanism 1 needs to be able to provide a large radial holding force and self-locking ability.

[0042] like Figure 3 As shown, the power mechanism 1 includes a driving motor, a trapezoidal lead screw 13 along the Y-axis direction, and a lead screw nut 14 sleeved on the outside of the trapezoidal lead screw 13. The driving motor is installed on the motor mounting plate 12. One end of the trapezoidal lead screw 13 is connected to the output shaft of the driving motor. The other end of the trapezoidal lead screw 13 is installed in the support seat 16 through a bearing 15 and a limit spring. The lead screw nut 14 is connected to the horizontal support seat 2.

[0043] In order to reduce the influence of the driving motor on the sampling work of the mass spectrometer, it is preferred to set the driving motor to a vacuum motor 11, which is well compatible with the vacuum environment in the vacuum chamber 5 of the mass spectrometer, has high reliability and long service life.

[0044] In order to accurately control the position of each sample point on the sample target plate 41, the motion control accuracy of the power mechanism 1 usually needs to be less than 5 μm, so as to provide micron-level power for the multi-channel sample target exchange sampling device.

[0045] The transverse support seat 2 is connected to the output end of the power mechanism 1 and is used to drive the reversing mechanism 3 and the sample loading platform 4 to move along the Y-axis direction. In order to limit the moving direction of the transverse support seat 2, it is preferred to set a guide slider 22 at the bottom of the transverse support seat 2. The guide slider 22 is slidably installed on the linear guide rail 23 on the bottom surface of the vacuum chamber 5. The linear guide rail 23 is set along the Y-axis direction. Figure 3 、 Figure 4 shown.

[0046] The reversing substrate 31 of the reversing platform 3 is slidably mounted on the transverse support base 2. The two can be slidably connected via a micro-guide slider 34 and a micro-guide rail arranged along the X-axis direction, so that the reversing substrate 31 can move relative to the transverse support base 2 along the X-axis direction.

[0047] In order to drive the reversing substrate 31 to move relative to the transverse support seat 2, a reversing wheel 32 is provided on the outer edge of the reversing substrate 31. When the sampling device enters the target until the reversing wheel 32 contacts the reversing track 33, since the reversing track 33 has a component along the X-axis direction, when the power mechanism 1 drives the reversing substrate 31 to continue to move along the Y-axis direction, the reversing track 33 pushes the reversing substrate 31 to move relative to the transverse support seat 2 along the X-axis direction, thereby realizing the target changing operation.

[0048] The sample target plate 41 is provided with at least two rows of sample points arranged along the Y-axis direction. The shape and size of the commutation track 33 are determined according to the spacing between the rows of sample points on the sample target plate 41, so that the commutation substrate 31 moves along the X-axis direction each time, and moves the spacing between the two rows of sample points.

[0049] After the sampling device completes sampling of all sample points, the reversing substrate 31 can be reset manually. However, it is preferred that a reversing wheel 32 is provided on each of the left and right sides of the reversing substrate 31, and the two reversing wheels 32 are respectively provided at the front and rear ends of the reversing substrate 31. The two reversing wheels 32 are used to drive the reversing substrate 31 to reciprocate relative to the transverse support seat 2 along the X-axis direction.

[0050] The sample loading platform 4 is provided on the reversing substrate 31 for placing samples to be tested. The specific structure and size of the sample loading platform 4 can be determined according to actual production needs with reference to existing sample loading platforms 4 and will not be described in detail here.

[0051] In this embodiment, the power mechanism 1 is used to drive the sample loading platform 4 to move back and forth along the Y-axis direction to realize the entry and exit of the sample in the target, and the reversing mechanism 3 is used to drive the sample loading platform 4 to move along the X-axis direction to realize the target change of the sample. Since only a single power source is used for driving, the space occupied is small, the equipment cost is low, and the interference of equipment debugging and human factors is reduced, thereby effectively reducing the equipment failure rate.

[0052] On the basis of the above embodiment, in order to ensure the accurate alignment of the sample point after the target is changed, please refer to Figure 12 The outer edge of the reversing substrate 31 is provided with at least two connected limiting grooves 311, and the transverse support seat 2 is provided with a limiting plunger 21 for cooperating with the limiting groove 311. When the limiting plunger 21 is clamped in the limiting groove 311, a corresponding column of sample points on the sample target plate 41 is set opposite the collection position.

[0053] The number of the limiting grooves 311 on the outer edge of the switching substrate 31 must be equal to the maximum number of rows of sample points that the sample target plate 41 can accommodate, and the distance between two adjacent limiting grooves 311 is determined by the spacing between the corresponding two rows of sample points.

[0054] The limiting grooves 311 are mostly set to be V-shaped or U-shaped to ensure accurate alignment of the sample point and the collection device. In order to facilitate the limiting plunger 21 to slide into the adjacent limiting grooves 311, any two adjacent limiting grooves 311 are connected by a smooth curved surface, so that the multiple connected limiting grooves 311 are wavy.

[0055] In this embodiment, the relative position of the reversing base 31 and the transverse support base 2 can be limited by the snap-fitting of the limiting groove 311 and the limiting plunger 21, thereby achieving accurate alignment of the sample point array and the collection position on the sample target plate 41, thereby ensuring sampling accuracy.

[0056] Preferably, the end of the limit plunger 21 relatively close to the limit groove 311 can be set to be spherical, so that there is rolling friction between the limit plunger 21 and the limit groove 311, which can effectively reduce the friction between the limit plunger 21 and the limit groove 311 and avoid the limit plunger 21 from getting stuck when changing targets.

[0057] Based on the above embodiment, the structure of the sample loading platform 4 is defined as follows: the reversing substrate 31 is provided with at least three insulating support columns 44, and the target positioning columns 42 are slidingly sleeved inside the insulating support columns 44. The target positioning columns 42 are connected to the insulating support columns 44 by circumferentially arranged fasteners to fix the relative positions of the target positioning columns 42 and the insulating support columns 44;

[0058] An electrode sheet 43 is provided between the target positioning post 42 and the insulating support post 44 . The top end of the target positioning post 42 is clamped in the sample target plate 41 of the sample loading platform 4 .

[0059] The target positioning column 42 and the insulating support column 44 together constitute a connecting column, which is used to separate the sample target plate 41 and the commutation substrate 31. Since at least three points are required to determine a plane, the number of connecting columns is at least three.

[0060] In order to improve the installation stability of the sample target plate 41 , the target positioning columns 42 are preferably arranged symmetrically about the symmetry plane of the sample target plate 41 along the Y-axis direction, and at least two target positioning columns 42 are arranged on the left and right sides of the sample target plate 41 .

[0061] The target positioning column 42 is slidably mounted in the insulating support column 44 , so that the height of the connecting column is adjustable. Thus, the height of the sample target plate 41 can be adjusted under the premise that the height of the commutation substrate 31 is constant, so as to better meet the sampling requirements.

[0062] In order to fix the position of the target positioning column 42 relative to the insulating support column 44, the outer periphery of the target positioning column 42 is provided with at least one through adjustment positioning hole 421, and fasteners such as fastening bolts and fastening pins are installed in the adjustment positioning hole 421 to abut the target positioning column 42 against the inner periphery of the insulating support column 44, thereby limiting the relative sliding of the two along the height direction.

[0063] The top end of the target positioning column 42 is clamped in the sample target plate 41. The shape of the clamping structure is not limited. It can be set as a circular protrusion and a circular hole, or it can be set as a truncated cone-shaped protrusion and a tapered hole 411.

[0064] Please refer to Figure 6 The top ends of the target positioning posts 42 at both ends of the sample target plate 41 may be provided with truncated cone-shaped mating portions, and the sample target plate 41 is provided with tapered holes 411 for mating with the mating portions, so as to achieve precise mating between the sample target plate 41 and the target positioning posts 42.

[0065] On the basis of the above embodiment, in order to facilitate the movement direction of the lateral support seat 2, a photoelectric switch 17 can be provided at both ends of the trapezoidal screw rod 13. When the screw nut 14 moves to the end of the trapezoidal screw rod 13, the photoelectric switch 17 outputs a position signal, thereby controlling the drive motor to stop or reverse movement.

[0066] The photoelectric switch 17 can be replaced by a proximity switch or other position sensor with similar functions, and its specific type and model are determined according to actual production needs;

[0067] The photoelectric switch 17 on the side relatively close to the driving motor can be directly arranged on the motor mounting plate 12, and the photoelectric switch 17 on the side relatively far from the driving motor can be fixed to the bottom surface of the vacuum chamber 5 through a mounting bracket.

[0068] On the basis of the above embodiment, the structure of the reversing track 33 is defined. The reversing track 33 may include a reversing portion and a connecting portion. The reversing portion is arranged toward the reversing substrate 31, and the reversing portion is provided with a track for the reversing wheel 32 to slide. The track may be as follows: Figure 9 As shown, only one side is provided with a limiting structure such as a limiting plate, but both sides may also be provided with a limiting structure;

[0069] The connecting part is arranged on the inner side of the vacuum chamber 5 through fasteners such as connecting bolts and connecting pins. Compared with fixing the reversing track 33 to the bottom surface of the vacuum chamber 5 through a mounting bracket, fewer accessories are required and less space is occupied, which is conducive to reducing the overall size of the sampling device.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] The above is a detailed introduction to the multi-channel sample-swap target sampling device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, various improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-channel sample target replacement sampling device, characterized in that: It comprises a power mechanism (1), a transverse support seat (2), a reversing mechanism (3) and a sample loading platform (4), wherein the transverse support seat (2) is connected to the output end of the power mechanism (1), the power mechanism (1) is used to drive the transverse support seat (2) to move along the Y-axis direction, and the sample loading platform (4) is installed on the reversing mechanism (3); The reversing mechanism (3) comprises a reversing track (33) and a reversing substrate (31) slidably arranged on the transverse support seat (2); a reversing wheel (32) is provided on the outer edge of the reversing substrate (31); when the reversing wheel (32) slides along the reversing track (33), the reversing substrate (31) can move relative to the transverse support seat (2) along the X-axis direction so as to move the position of each sample point on the sample target plate (41) of the sample loading platform (4); the X-axis direction is not parallel to the Y-axis direction.

2. The multi-channel sample target replacement sampling device according to claim 1, characterized in that: A reversing wheel (32) is provided on each of the left and right sides of the reversing substrate (31), and the two reversing wheels (32) are respectively provided at the front and rear ends of the reversing substrate (31). The two reversing wheels (32) are used to drive the reversing substrate (31) to reciprocate along the X-axis direction relative to the transverse support seat (2).

3. The multi-channel sample target replacement sampling device according to claim 1, characterized in that: The outer edge of the reversing substrate (31) is provided with at least two connected limiting grooves (311), and the transverse support seat (2) is provided with a limiting plunger (21) for cooperating with the limiting groove (311). When the limiting plunger (21) is locked in the limiting groove (311), a corresponding row of sample points on the sample target plate (41) is arranged opposite to the collection position.

4. The multi-channel sample target-changing sampling device according to claim 3, characterized in that: One end of the limiting plunger (21) relatively close to the limiting groove (311) is spherical, so as to reduce the friction between the limiting plunger (21) and the limiting groove (311).

5. The multi-channel sample target replacement sampling device according to any one of claims 1 to 4, characterized in that: The reversing substrate (31) is provided with at least three insulating support columns (44), a target positioning column (42) is provided in a sliding sleeve inside the insulating support column (44), and the target positioning column (42) is connected to the insulating support column (44) via a circumferentially arranged fastener to fix the relative position of the target positioning column (42) and the insulating support column (44); An electrode sheet (43) is provided between the target positioning column (42) and the insulating support column (44), and the top end of the target positioning column (42) is clamped in the sample target plate (41).

6. The multi-channel sample target-changing sampling device according to claim 5, characterized in that: The target positioning columns (42) are symmetrically arranged with respect to a symmetric plane of the sample target plate (41) arranged along the Y-axis direction, at least two target positioning columns (42) are arranged on the left and right sides of the sample target plate (41), and the top ends of the target positioning columns (42) arranged on both sides of the sample target plate (41) are provided with a truncated cone-shaped matching portion, and the sample target plate (41) is provided with a tapered hole (411) for matching with the matching portion.

7. The multi-channel sample target replacement sampling device according to any one of claims 1 to 4, characterized in that: The power mechanism (1) comprises a driving motor, a trapezoidal lead screw (13) along the Y-axis direction, and a lead screw nut (14) sleeved on the outside of the trapezoidal lead screw (13), one end of the trapezoidal lead screw (13) is connected to the output shaft of the driving motor, the other end of the trapezoidal lead screw (13) is installed in a support seat (16) through a bearing (15) and a limit spring, and the lead screw nut (14) is connected to the transverse support seat (2).

8. The multi-channel sample target-changing sampling device according to claim 7, characterized in that: Both ends of the trapezoidal lead screw (13) are provided with a photoelectric switch (17), and when the lead screw nut (14) moves to the end of the trapezoidal lead screw (13), the photoelectric switch (17) outputs a position signal.

9. The multi-channel sample target-changing sampling device according to any one of claims 1 to 4, characterized in that: A guide rail slider (22) is provided at the bottom of the transverse support seat (2), and the guide rail slider (22) is slidably mounted on a linear guide rail (23) on the bottom surface of the vacuum chamber (5), and the linear guide rail (23) is arranged along the Y-axis direction.

10. The multi-channel sample target-changing sampling device according to any one of claims 1 to 4, characterized in that: The reversing track (33) comprises a reversing portion and a connecting portion, the reversing portion is arranged toward the reversing substrate (31), and the connecting portion is arranged on the inner side surface of the vacuum chamber (5) via a fastener.

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