Adjusting device, ion transport device and mass spectrometer
By designing an adjustment device, the assembly height of the quadrupole is adjusted using a base, fixing components, support components, and limiting components. This solves the problem of inaccurate assembly of the quadrupole in the mass spectrometer and achieves stable adjustment and precise assembly of the transmission device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SEPPO BIOTECHNOLOGY CO LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-06-12
AI Technical Summary
In the existing technology, it is difficult to ensure the accuracy of the installation position when assembling a quadrupole in a mass spectrometer, which leads to inconvenience in adjustment.
An adjustment device is designed, including a base, a fixing component, a support component, an adjustment component, and a limiting component. The relative height between the fixing component and the base is changed by adjusting the size of the adapter opening, ensuring accurate assembly of the transmission device.
Stable adjustment of the transmission device was achieved, assembly accuracy was improved, the adjustment process was simplified, and the stability of the transmission device in the mass spectrometer was enhanced.
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Figure CN224355224U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an adjustment and positioning device, and more particularly to an adjustment device, an ion transmission device, and a mass spectrometer. Background Technology
[0002] In related technologies, the quadrupole is a core component of a mass spectrometer. When assembling the quadrupole into the mass spectrometer, it is necessary to ensure that the installation position of the quadrupole is highly accurate. Therefore, an adjustment device is needed to stably adjust the assembly height of the quadrupole. Utility Model Content
[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present invention provides an adjustment device to raise the height of the transmission device in the mass spectrometer, so as to facilitate the accurate assembly and use of the transmission device.
[0004] An adjustment device according to a first aspect of the present invention is applied in a mass spectrometer to adjust the transmission device in the mass spectrometer. The adjustment device includes:
[0005] A base is used to provide support;
[0006] Fixing components are used to fix the transmission device;
[0007] A support assembly having an adjustable-size fitting opening, wherein the fixing assembly abuts against the support assembly through the fitting opening;
[0008] An adjustment component is used to adjust the size of the adapter opening to change the relative height between the fixing component and the base, wherein the height and the opening size are negatively correlated.
[0009] A limiting component is disposed on the base and is used to limit and abut against the fixing component on the side of the fixing component opposite to the base.
[0010] The adjustment device according to the present utility model embodiment has at least the following beneficial effects: the fixed component is stably placed by the adapter opening formed by the bracket assembly abutting against the fixed component, and the bracket assembly is adjusted by controlling the adjustment assembly to change the size of the adapter opening, thereby adjusting the height of the fixed component, i.e. the height of the transmission device.
[0011] According to some embodiments of the present invention, the fixing component includes a first fixing component and a second fixing component spaced apart on the transmission device;
[0012] The bracket assembly includes a first bracket assembly and a second bracket assembly. The first bracket assembly has a first adapter opening, and the first fixing component abuts against the first bracket assembly through the first adapter opening. The second bracket assembly has a second adapter opening, and the second fixing component abuts against the second bracket assembly through the second adapter opening.
[0013] The adjustment component includes a first adjustment component and a second adjustment component. The first adjustment component is used to adjust the size of the first adapter opening, and the second adjustment component is used to adjust the size of the second adapter opening.
[0014] According to some embodiments of the present invention, the first support assembly includes at least two first abutting members, the two first abutting members are spaced apart on the base, and a first adapting opening is formed between the two first abutting members;
[0015] In this embodiment, at least one of the two first abutting parts can slide relative to or away from the other.
[0016] According to some embodiments of the present invention, the first adjustment component includes:
[0017] The first screw is spaced apart on opposite sides of the base, and the first abutting component is also slidably connected to the first screw;
[0018] The first adjusting component is threadedly connected to the first screw and located on the side of the first abutting component away from the base.
[0019] A first elastic member is disposed between the base and the first abutting member and elastically abuts against the base and the first abutting member.
[0020] According to some embodiments of the present invention, the second support assembly includes at least two second abutting members, the two second abutting members being spaced apart on the base, and a second adapting opening being formed between the two second abutting members;
[0021] In this embodiment, at least one of the two second abutting parts can slide relative to or away from the other.
[0022] According to some embodiments of the present invention, the second adjustment component includes:
[0023] The second screw is spaced apart on opposite sides of the base, and the second abutting component is also slidably connected to the second screw;
[0024] The second adjusting component is threadedly connected to the second screw and located on the side of the second abutting component away from the base.
[0025] The second elastic member is disposed between the base and the second abutting member and elastically abuts against the base and the second abutting member.
[0026] According to some embodiments of the present invention, the limiting component includes:
[0027] Supporting components are spaced apart on the base;
[0028] A connecting component is connected between two spaced-apart supporting components and is located at the end of the supporting components away from the base.
[0029] A limiting component is connected to the side of the component facing the base, and the limiting component elastically abuts against the first fixing component and the second fixing component.
[0030] According to some embodiments of the present invention, the adjustment device further includes a positioning component, which is disposed on the base and is adapted to be inserted and engaged with the fixing component.
[0031] A second aspect of the present invention also provides an ion transport device, the ion transport device comprising;
[0032] The transmission device forms at least one ion transmission channel;
[0033] As provided in the first aspect of the present invention, the adjustment device is used to adjust the relative height between the transmission device and the base.
[0034] A third aspect of the present invention also provides a mass spectrometer, the mass spectrometer comprising:
[0035] An ion source is used to generate charged ions;
[0036] As provided in the second aspect embodiment of the present invention, the ion transport device is used to transport the ions;
[0037] A detector for analyzing the ions transported by the ion transport device.
[0038] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0040] Figure 1 This is a three-dimensional structural diagram of the adjusting device and the transmitting device in the embodiments of this utility model;
[0041] Figure 2 This is an exploded view of the adjustment component and support component of the adjustment device in an embodiment of the present invention;
[0042] Figure 3 This is a three-dimensional structural diagram of the adjusting device after removing the limiting component and the transmission device in the embodiment of this utility model;
[0043] Figure 4 This is a three-dimensional structural diagram of the adjusting device after removing the fixing components in an embodiment of this utility model.
[0044] Reference numerals: 100, base; 110, positioning component; 120, fixing component; 121, first fixing component; 122, second fixing component; 130, support assembly; 131, first support assembly; 132, first abutting component; 133, second support assembly; 134, second abutting component; 150, adjusting component; 151, first adjusting component; 152, first screw; 153, first adjusting component; 154, first elastic component; 155, second adjusting component; 156, second screw; 157, second adjusting component; 158, second elastic component; 160, limiting component; 161, raising component; 162, connecting component; 163, limiting component; 200, transmission device. Detailed Implementation
[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0046] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0047] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0048] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0049] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0050] This application provides a mass spectrometer, which includes an ion source, an ion transmission device, and a detector.
[0051] An ion source is used to generate charged ions. Typically, the sample to be analyzed is ionized into charged ions or charged ion clusters through ionization, so that the charged ions or charged ion clusters can be analyzed.
[0052] Ion transport devices are used to transport charged ions or charged ion clusters generated in an ion source to a detector so that the detector can analyze the charged ions or charged ion clusters for detection and analysis.
[0053] In another embodiment of this application, the ion transport device includes a transport device 200 and a regulating device.
[0054] The transmission device 200 has at least one ion transmission channel for allowing ions to pass through in order to transmit ions.
[0055] The adjustment device is used to adjust the height between the transmission device 200 and the base 100, so as to adjust the assembly height of the transmission device 200. Because the assembly position accuracy of the transmission device 200 in the mass spectrometer is required, it is necessary to adjust the transmission device 200 through the adjustment device.
[0056] Please see Figure 1 In another embodiment of this application, the transmission device 200 includes a base 100, a fixing component 120, a support component 130, an adjustment component 150, and a limiting component 160.
[0057] The base 100 is used to provide support for placing the transmission device 200 to be adjusted.
[0058] The fixing component 120 is used to fix the transmission device 200. In a specific embodiment of this application, the fixing component 120 may be an approximately ring-shaped structure, which is used to be sleeved on the outer periphery of the transmission device 200 to fix the transmission device 200.
[0059] The support assembly 130 forms an adjustable-size adaptation opening, through which the fixing assembly 120 abuts against the support assembly 130. The adjustment assembly 150 is used to adjust the size of the adaptation opening to change the relative height between the fixing assembly 120 and the base 100, wherein the height and opening size are negatively correlated. By controlling the adjustment assembly 150 to adjust the support assembly 130 to change the size of the adaptation opening, the height of the transmission device 200 relative to the base 100 is changed. For example, when the adaptation opening increases, the relative height between the transmission device 200 and the base 100 decreases; when the adaptation opening decreases, the relative height between the transmission device 200 and the base 100 increases.
[0060] The limiting component 160 is disposed on the base 100 and is used to limit and abut against the fixing component on the side of the fixing component away from the base 100. By setting the limiting component 160, the adjustment range of the transmission device 200 is limited to between the base 100 and the limiting component 160, thereby improving the stability of the adjustment of the transmission device 200.
[0061] Please see Figure 3 The adjustment device also includes a positioning component 110, which is disposed on the base 100 and is adapted to be inserted into the fixing component 120. Before adjusting the transmission device 200, the transmission device 200 needs to be stably placed on the base 100. After the fixing component 120 fixes and assembles the transmission device 200, the fixing component 110 is inserted into the fixing component 120 to stably place the fixing component 120 on the base 100.
[0062] In one specific embodiment, the fixing component 120 includes a first fixing component 121 and a second fixing component 122 spaced apart on the transmission device 200. Typically, the transmission device 200 is composed of multiple elongated tubular structures. By setting the first fixing component 121 and the second fixing component 122, the stability of fixing the transmission device 200 is improved.
[0063] Please see Figure 2 The bracket assembly 130 includes a first bracket assembly 131 and a second bracket assembly 133. The first bracket assembly 131 has a first fitting opening, and a first fixing member 121 abuts against the first bracket assembly 131 through the first fitting opening. The second bracket assembly 133 has a second fitting opening, and a second fixing member 122 abuts against the second bracket assembly 133 through the second fitting opening.
[0064] The adjustment component 150 includes a first adjustment component 151 and a second adjustment component 155. The first adjustment component 151 is used to adjust the size of the first adapter opening, and the second adjustment component 155 is used to adjust the size of the second adapter opening.
[0065] The first bracket assembly 131 is adjusted by the first adjustment component 151 to adjust the size of the first adapter opening, thereby adjusting the height of the first fixing component 121 relative to the base 100. Correspondingly, the second bracket assembly 133 is adjusted by the second adjustment component 155 to adjust the size of the second adapter opening, thereby adjusting the height of the second fixing component 122 relative to the base 100. Since the first fixing component 121 and the second fixing component 122 are sleeved on the outer periphery of the transmission device 200, the height of both ends of the transmission device 200 can be adjusted by adjusting the height of the first fixing component 121 and the second fixing component 122.
[0066] In a specific embodiment, the first support assembly 131 includes at least two first abutting members 132, which are spaced apart on the base 100, and a first fitting opening is formed between the two first abutting members 132.
[0067] At least one of the two first abutting members 132 can slide relative to or away from the other. The first adjusting component 151 can adjust the sliding of either of the two first abutting members 132 to adjust and change the distance between the two first abutting members 132, thereby changing the size of the first adapting opening. For example, controlling the first adjusting component 151 to adjust one of the first abutting members 132 to slide towards the other first abutting member 132 reduces the distance between the two first abutting members 132, i.e., reduces the first adapting opening, thereby increasing the height between the first fixing member 121 and the base 100; controlling the first adjusting component 151 to adjust one of the first abutting members 132 to slide away from the other first abutting member 132 increases the distance between the two first abutting members 132, i.e., increases the first adapting opening, thereby decreasing the height between the first fixing member 121 and the base 100.
[0068] Alternatively, the first adjusting component 151 can be controlled to adjust the two first abutting parts 132 to move closer to each other, thereby reducing the distance between the two first abutting parts, that is, reducing the first fitting opening, thereby increasing the height between the first fixing part 121 and the base 100; or the first adjusting component 151 can be controlled to adjust the two first abutting parts 150 to move further apart from each other, thereby increasing the distance between the two first abutting parts 132, that is, increasing the first fitting opening, thereby reducing the height between the first fixing part 121 and the base 100.
[0069] In this configuration, the surfaces of the two first abutting members 132 on opposite sides are inclined to each other, and the distance between the ends of the two first abutting members 132 near the base 100 is smaller than the distance between the ends of the two first abutting members 132 away from the base 100. The first fixing member 121 abuts against the inclined surfaces of the two first abutting members 132, thereby making the first fitting opening formed by the two first abutting members 132 negatively correlated with the height of the first fixing member 121 relative to the base 100.
[0070] Specifically, the first adjustment component 151 includes a first screw 152, a first adjustment member 153, and a first elastic member 154.
[0071] The first screw 152 is spaced apart on opposite sides of the base 100. The first abutting member 132 is also slidably connected to the first screw 152. The first adjusting member 153 is threadedly connected to the first screw 152 and is located on the side of the first abutting member 132 away from the base 100. The first elastic member 154 is disposed between the base 100 and the first abutting member 132 and elastically abuts against the base 100 and the first abutting member 132.
[0072] By rotating the first adjusting component 153, the position of the first adjusting component 153 on the first screw 152 is adjusted, thereby pushing the first abutting component 132 to move. When the movement of the first abutting component 132 reduces the first fitting opening, the first abutting component 132 moves toward the base 100, and the first elastic component 154 is in a compressed state. When the movement of the first abutting component 132 increases the first fitting opening, the first adjusting component 153 releases its pushing force, and the first elastic component 154 releases its pressure to push the first adjusting component 153 to move away from the base 100, thereby increasing the first fitting opening and reducing the relative height between the first fixing component 121 and the base 100.
[0073] In the embodiments of this application, the first adjusting component 153 is a nut. It is understood that the first adjusting component 153 can also be other parts that can be rotatably threadedly connected to the first screw 152. The first elastic component 154 is a compression spring and is sleeved on the first screw 152. By adopting this method, the first elastic component 154 can be stably assembled between the base 100 and the first abutment part. It is understood that the first elastic component 154 can also be other elastic structures.
[0074] Correspondingly, the second support assembly 133 includes at least two second abutting members 134, which are spaced apart on the base 100, and a second fitting opening is formed between the two second abutting members 134.
[0075] At least one of the two second abutting members 134 can slide relative to or away from the other. The second adjustment component 155 can adjust any two of the two second abutting members 134 to slide, thereby changing the distance between the two second abutting members 134 and thus changing the size of the second fitting opening. For example, controlling the second adjustment component 155 to adjust one of the second abutting members 134 to slide towards the other second abutting member 134 reduces the distance between the two second abutting members 134, i.e., reduces the second fitting opening, thereby increasing the height between the second fixing member 122 and the base 100; controlling the second adjustment component 155 to adjust one of the second abutting members 134 to slide away from the other second abutting member 134 increases the distance between the two second abutting members 134, i.e., increases the second fitting opening, thereby decreasing the height between the second fixing member 122 and the base 100.
[0076] Alternatively, the second adjusting component 155 can be controlled to adjust the two second abutting parts 134 to move closer together, thereby reducing the distance between the two second abutting parts, i.e., reducing the second fitting opening, thereby increasing the height between the second fixing part 122 and the base 100; or the second adjusting component 155 can be controlled to adjust the two second abutting parts 150 to move further apart, thereby increasing the distance between the two second abutting parts 134, i.e., increasing the second fitting opening, thereby reducing the height between the second fixing part 122 and the base 100.
[0077] In this configuration, the surfaces of the two second abutting members 134 on opposite sides are inclined to each other, and the distance between the ends of the two second abutting members 134 near the base 100 is less than the distance between the ends of the two first abutting members 132 away from the base 100. The second fixing member 122 abuts against the inclined surfaces of the two second abutting members 134, thereby making the second fitting opening formed by the two second abutting members 134 negatively correlated with the height of the second fixing member 122 relative to the base 100.
[0078] Specifically, the second adjustment assembly 155 includes a second screw 156, a second adjustment component 157, and a second elastic component 158.
[0079] The second screw 156 is spaced apart on opposite sides of the base 100. The second abutting member 134 is also slidably connected to the second screw 156. The second adjusting member 157 is threadedly connected to the second screw 156 and is located on the side of the second abutting member 134 away from the base 100. The second elastic member 158 is disposed between the base 100 and the second abutting member 134 and elastically abuts against the base 100 and the second abutting member 134.
[0080] By rotating the second adjusting member 157, the position of the second adjusting member 157 on the second screw 156 is adjusted, thereby pushing the second abutting member 134 to move. When the movement of the second abutting member 134 reduces the second fitting opening, the second abutting member 134 moves toward the base 100, and the second elastic member 158 is in a compressed state. When the movement of the second abutting member 134 increases the second fitting opening, the second adjusting member 157 releases its pushing force, and the second elastic member 158 releases its pressure to push the second adjusting member 157 to move away from the base 100, thereby increasing the second fitting opening and reducing the relative height between the second fixing member 122 and the base 100.
[0081] In the embodiments of this application, the second adjusting component 157 is a nut. It is understood that the second adjusting component 157 can also be other parts that can be rotatably threadedly connected to the second screw 156. The second elastic component 158 is a compression spring and is sleeved on the second screw 156. By adopting this method, the second elastic component 158 can be stably assembled between the base 100 and the second abutment part. It is understood that the second elastic component 158 can also be other elastic structures.
[0082] Please see Figure 4 In some specific embodiments, the limiting component 163 includes a supporting component 161, a connecting component 162, and a limiting component 163.
[0083] Elevating members 161 are spaced apart on the base 100. Connecting members 162 are connected between the spaced-apart elevating members 161 and located at the end of the elevating members 161 away from the base 100. Limiting members 163 are connected to the side of the members facing the base 100 and elastically abut against the first fixing member 121 and the second fixing member 122. By setting the limiting members 163, the adjustment height of the transmission device 200 is limited in the adjustment direction of the transmission device 200, so as to prevent the distance between the transmission device 200 and the base 100 from being too high, which would cause the transmission device 200 to detach from the base 100, thereby increasing the stability of the transmission device 200.
[0084] In the embodiments of this application, the limiting component 163 is specifically a plate-like structure that is approximately inverted V-shaped. The two ends of the limiting component 163 abut against the first fixing component 121 and the second fixing component 122, respectively. The inverted V-shaped structure provides the limiting component 163 with the ability to undergo elastic deformation, thereby improving the safety of the limiting component 163 when it abuts against the first fixing component 121 and the second fixing component 122, and reducing rigid damage such as scratches caused by the contact during the contact.
[0085] In summary, the embodiments of this application adjust the height of the transmission device 200 in the mass spectrometer using an adjustment device, so that the transmission device 200 can be accurately assembled in the mass spectrometer. The size of the fitting opening formed by the support assembly 130 is adjusted by the adjustment component 150, and the fixing component 120 on the transmission device 200 abuts against the fitting opening, thereby adjusting the height of the transmission device 200. The overall structure is simple, and the height of the transmission device 200 relative to the base 100 can be quickly adjusted. The adjustment method is also convenient. The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Furthermore, in the absence of conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other.
Claims
1. An adjustment device, used in a mass spectrometer to adjust the transmission device within the mass spectrometer, characterized in that, The regulating device includes: A base is used to provide support; Fixing components are used to fix the transmission device; A support assembly having an adjustable-size fitting opening, wherein the fixing assembly abuts against the support assembly through the fitting opening; An adjustment component is used to adjust the size of the adapter opening to change the relative height between the fixing component and the base, wherein the height and the opening size are negatively correlated. A limiting component is disposed on the base and is used to limit and abut against the fixing component on the side of the fixing component opposite to the base.
2. The adjusting device according to claim 1, characterized in that, The fixing component includes a first fixing part and a second fixing part that are spaced apart on the transmission device; The bracket assembly includes a first bracket assembly and a second bracket assembly. The first bracket assembly has a first adapter opening, and the first fixing component abuts against the first bracket assembly through the first adapter opening. The second bracket assembly has a second adapter opening, and the second fixing component abuts against the second bracket assembly through the second adapter opening. The adjustment component includes a first adjustment component and a second adjustment component. The first adjustment component is used to adjust the size of the first adapter opening, and the second adjustment component is used to adjust the size of the second adapter opening.
3. The adjusting device according to claim 2, characterized in that, The first support assembly includes at least two first abutting members, which are spaced apart on the base, and a first fitting opening is formed between the two first abutting members; In this embodiment, at least one of the two first abutting parts can slide relative to or away from the other.
4. The adjusting device according to claim 3, characterized in that, The first adjustment component includes: The first screw is spaced apart on opposite sides of the base, and the first abutting component is also slidably connected to the first screw; The first adjusting component is threadedly connected to the first screw and located on the side of the first abutting component away from the base. A first elastic member is disposed between the base and the first abutting member and elastically abuts against the base and the first abutting member.
5. The adjusting device according to claim 2, characterized in that, The second support assembly includes at least two second abutting members, which are spaced apart on the base, and a second adapter opening is formed between the two second abutting members; In this embodiment, at least one of the two second abutting parts can slide relative to or away from the other.
6. The adjusting device according to claim 5, characterized in that, The second adjustment component includes: The second screw is spaced apart on opposite sides of the base, and the second abutting component is also slidably connected to the second screw; The second adjusting component is threadedly connected to the second screw and located on the side of the second abutting component away from the base. The second elastic member is disposed between the base and the second abutting member and elastically abuts against the base and the second abutting member.
7. The adjusting device according to claim 2, characterized in that, The limiting component includes: Supporting components are spaced apart on the base; A connecting component is connected between two spaced-apart supporting components and is located at the end of the supporting components away from the base. A limiting component is connected to the side of the component facing the base, and the limiting component elastically abuts against the first fixing component and the second fixing component.
8. The adjusting device according to claim 1, characterized in that, The adjustment device further includes a positioning component, which is disposed on the base and is adapted to be inserted and engaged with the fixing component.
9. An ion transport device, characterized in that, include: The transmission device forms at least one ion transmission channel; The adjusting device according to any one of claims 1-8, wherein the adjusting device is used to adjust the relative height between the transmission device and the base.
10. A mass spectrometer, characterized in that, include; An ion source is used to generate charged ions; The ion transport device as described in claim 9, wherein the ion transport device is used to transport the ions; A detector for analyzing the ions transported by the ion transport device.