Rotary disc assembly for sample injector and sample injector

Abstract

The utility model discloses a turntable assembly for a sample injector and the sample injector. The turntable assembly comprises a pivotal bearing and a turntable body which are coaxially arranged, wherein the pivotal bearing is arranged in a bearing groove of the sample injector base plate, the turntable body is positioned above the sample injector base plate and is fixedly connected with a bearing outer ring of the pivotal bearing, and then the bearing outer ring of the pivotal bearing is also in transmission connection with a driving motor of the sample injector; moreover, a magnetic rotary encoder is arranged between the turntable body and the rotary bearing, the magnet is fixed on the bottom end face, facing the rotary bearing, of the turntable body, the PCB is fixed at the top end, in the vertical direction, of the inner ring of the bearing, and the magnet and the PCB are both located on the axis of the rotary bearing or the turntable body; therefore, the PCB is fixed at the top end of the bearing inner ring, and the PCB can be positioned at a relatively high position by means of the height of the bearing inner ring in the bearing groove and is not easy to contact with condensed water accumulated in the bearing groove, so that the technical problem that the PCB is short-circuited due to contact with the condensed water is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sample injectors, in particular to a turntable component used for a sample injector and the sample injector. Background Art

[0002] Injectors are commonly used in analytical equipment such as liquid chromatographs.

[0003] In the related scheme, the sampler drives the turntable to rotate through a slewing bearing, wherein the base plate of the sampler is usually provided with a bearing groove, in which a slewing bearing is installed, and then a turntable connected to the slewing bearing is provided above the base plate, and the turntable is used to place multiple samples. In this way, the driving motor located under the base plate can drive the turntable to rotate through the slewing bearing, and the rotation accuracy of the turntable can generally be controlled by a magnetic encoder.

[0004] However, in the above scheme, considering that the working environment of the sampler is low temperature, when the analysis equipment is turned on, condensed water will accumulate in the bearing groove of the sampler, and the PCB board of the magnetic encoder is usually installed at a lower position of the slewing bearing. Therefore, there is a risk of short circuit of the PCB board due to contact with condensed water. Utility Model Content

[0005] In response to at least one aspect of the above-mentioned technical problems, an embodiment of the present application provides a turntable assembly and an injector for an injector. The turntable assembly arranges a PCB board of a magnetic encoder on the top of the inner ring of the slewing bearing. In this way, the PCB board can be located at a relatively high position and will not contact the condensed water in the bearing groove, thereby solving the technical problem of short circuit of the PCB board due to contact with condensed water.

[0006] The present application embodiment provides a turntable assembly for an injector, the turntable assembly comprising:

[0007] A slewing bearing and a turntable body are coaxially arranged in a vertical direction; the turntable body is located above a substrate of the sample injector, the slewing bearing is located in a bearing groove of the substrate, the slewing bearing comprises an inner bearing ring and an outer bearing ring, the bottom end of the inner bearing ring in the vertical direction is used to be fixed to the sample injector, the outer bearing ring is used to be connected to the driving motor of the sample injector, and the turntable body is fixedly installed with the outer bearing ring so that the turntable body is driven to rotate by the driving motor through the outer bearing ring;

[0008] A magnetic rotary encoder located between the turntable body and the slewing bearing; the magnetic rotary encoder comprises a magnet and a PCB board respectively fixedly mounted on the turntable body and the inner ring of the bearing;

[0009] Wherein, the magnet is fixedly mounted on the bottom end surface of the turntable body facing the slewing bearing, and the PCB board is fixedly mounted on the top of the inner ring of the bearing in the vertical direction;

[0010] Furthermore, the magnet and the PCB board are both located on the axis of the slewing bearing or the turntable body.

[0011] In one embodiment, preferably, the magnetic rotary encoder comprises a single magnetic pole encoder; wherein,

[0012] In a plane perpendicular to the vertical direction, the magnet includes an N pole and an S pole arranged opposite to each other;

[0013] The PCB board includes a Hall device, and the Hall device is located in the projection area of ​​the magnet.

[0014] In one embodiment, preferably, the PCB board is circular, and the PCB board is fastened to the top end of the inner ring of the bearing by a pair of first screws arranged opposite to each other; and a first positioning column protrudes from the top end of the inner ring of the bearing, and a positioning notch is provided at the circumferential end of the PCB board to cooperate with the first positioning column.

[0015] In one embodiment, preferably, in the annular area projected by the outer ring of the bearing, an abutment boss protrudes from the bottom end face of the turntable body, the abutment boss abuts against the top end of the outer ring of the bearing, and the abutment boss and the outer ring of the bearing are fastened and installed by a second screw to fix the turntable body to the outer ring of the bearing.

[0016] In one embodiment, preferably, the abutting boss is arranged in an annular shape, so that a concave mounting groove is formed inside the abutting boss, and the magnet is fixed in the mounting groove.

[0017] In one embodiment, preferably, a second positioning column is protruded from the top end of the outer ring of the bearing, and a positioning groove for inserting the second positioning column is provided at the end of the abutting boss.

[0018] In one embodiment, preferably, along the vertical direction, the height of the inner ring of the bearing is higher than the height of the outer ring of the bearing, and the height of the inner ring of the bearing is at least not lower than the height of the upper surface of the substrate.

[0019] In one embodiment, preferably, the injector is provided with a fixing block in a projection area corresponding to the inner ring of the bearing, and the bottom end of the inner ring of the bearing in the vertical direction is fastened to the fixing block by a third screw.

[0020] The present application also provides an injector, the injector comprising:

[0021] A horizontally arranged base plate, wherein the base plate is provided with an inwardly concave bearing groove;

[0022] A slewing bearing is fixedly installed in the bearing groove, the slewing bearing comprises a bearing inner ring and a bearing outer ring, and the bottom end of the bearing inner ring in the vertical direction is fixed to the injector;

[0023] A turntable body is arranged above the base plate, the turntable body and the slewing bearing are coaxially arranged, and the turntable body and the outer ring of the bearing are fixedly installed;

[0024] A driving motor fixed to the base plate, wherein a driving shaft of the driving motor is located below the base plate, and the driving shaft is drivingly connected to an outer ring of a bearing;

[0025] Wherein, a magnetic rotary encoder is provided between the turntable body and the slewing bearing, and the magnetic rotary encoder comprises a magnet and a PCB board which are respectively fixedly mounted on the turntable body and the inner ring of the bearing, the magnet is fixedly mounted on the bottom end surface of the turntable body facing the slewing bearing, and the PCB board is fixedly mounted on the top end of the inner ring of the bearing in the vertical direction; and the magnet and the PCB board are both located on the axis of the slewing bearing or the turntable body.

[0026] In one embodiment, preferably, below the base plate, the outer ring of the bearing is connected to the driving shaft via a belt drive;

[0027] Wherein, the outer surface of the outer ring of the bearing is provided with a first transmission tooth, and the inner surface of the belt is provided with a second transmission tooth for meshing and connecting with the first transmission tooth.

[0028] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0029] The embodiment of the present application provides a turntable assembly and an injector for an injector, the turntable assembly comprising a coaxially arranged slewing bearing and a turntable body; wherein the slewing bearing is arranged in a bearing groove of an injector substrate, the turntable body is located above the injector substrate and is fixedly connected to the bearing outer ring of the slewing bearing, and then the bearing outer ring of the slewing bearing is also transmission-connected to a driving motor of the injector; and a magnetic rotary encoder is provided between the turntable body and the slewing bearing, the magnet of the magnetic rotary encoder is fixed to the bottom end surface of the turntable body facing the slewing bearing, the PCB board of the magnetic rotary encoder is fixed to the top end of the bearing inner ring in the vertical direction, and the magnet and the PCB board are both located on the axis of the slewing bearing or the turntable body; in this way, by fixing the PCB board to the top end of the bearing inner ring, with the help of the height of the bearing inner ring in the bearing groove, the PCB board can be placed in a relatively high position and is not easily contacted with condensed water accumulated in the bearing groove, thereby solving the technical problem of short circuit of the PCB board due to contact with condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the structure in which the slewing bearing described in the embodiment of the present application is installed in the bearing groove.

[0032] Figure 2 for Figure 1 A partial enlarged view of .

[0033] Figure 3 for Figure 1 Schematic diagram of the structure on the back side of the middle substrate.

[0034] Figure 4 The turntable body described in the embodiment of the present application is installed on Figure 1 Schematic diagram of the structure of the slewing bearing.

[0035] Figure 5 for Figure 4 Schematic diagram of the half-section structure.

[0036] Figure 6 for Figure 5 A partial enlarged view of .

[0037] Figure 7 It is a schematic diagram of the structure of the slewing bearing described in the embodiment of the present application.

[0038] Figure 8This is a schematic diagram of the structure in which the PCB board described in the embodiment of the present application is installed on the inner ring of the bearing.

[0039] Fig. 9 for Figure 8 Schematic diagram of the side structure.

[0040] Fig.10 It is a schematic diagram of the structure of the turntable body described in the embodiment of the present application.

[0041] Fig.11 for Fig.10 Schematic diagram of the structure on the back of the turntable body.

[0042] Wherein, the reference numerals are:

[0043] 100-base plate, 200-bearing groove, 300-drive motor, 400-belt, 500-fixed block,

[0044] 10-slewing bearing, 11-bearing inner ring, 12-bearing outer ring,

[0045] 111- first positioning column,

[0046] 121- second positioning column, 122- first transmission tooth,

[0047] 20-turntable body, 21-top end surface, 22-bottom end surface, 23-butting boss, 24-mounting slot, 25-screw through hole,

[0048] 231-positioning slot, 232-weight reduction slot,

[0049] 31-magnet, 32-PCB board,

[0050] 321-Hall device, 322-positioning notch,

[0051] 41-first screw, 42-second screw,

[0052] X-vertical direction. DETAILED DESCRIPTION

[0053] In order to better understand the above technical solution, the example embodiments of the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited to the exemplary embodiments described here.

[0054] Injectors are usually used in analytical equipment such as liquid chromatographs. Injectors generally drive the turntable to rotate through a slewing bearing. Figure 1 The base plate 100 of the sample injector is usually provided with a bearing recess 200, in which a rotary bearing 10 is installed. Figure 4 A turntable body 20 may be disposed above the substrate 100, and the turntable body is connected to a slewing bearing. The turntable body is used to place a plurality of samples. Thus, a driving motor located below the substrate may drive the turntable body to rotate through the slewing bearing. In addition, the rotation accuracy of the turntable body may generally be controlled by a magnetic encoder.

[0055] In the existing sample injector, the PCB board of the magnetic encoder is usually installed at a lower position of the rotary bearing. In this way, considering that the working environment of the sample injector is low temperature, when the liquid chromatograph and other analytical equipment are turned on, condensed water will accumulate in the bearing groove 200 of the base plate. When the accumulated condensed water contacts the PCB board at a lower position, it often causes the PCB board to short-circuit, thereby failing to guarantee the rotation accuracy control of the turntable.

[0056] In view of the above situation, the embodiment of the present application fixes the PCB board of the magnetic encoder on the top of the inner ring of the slewing bearing, so that the PCB board can be placed in a relatively high position by virtue of the height of the inner ring of the bearing in the bearing groove, making it difficult for it to contact the condensed water accumulated in the bearing groove, thereby avoiding the risk of short circuit of the PCB board due to contact with condensed water. In this way, the accurate control of the rotation of the turntable can be guaranteed, and the normal and stable operation of the analysis equipment can be guaranteed.

[0057] Please combine Figure 1 to Figure 4 A turntable assembly for an injector includes a slewing bearing 10 and a turntable body 20 coaxially arranged along a vertical direction (i.e., X direction in each figure), and a magnetic rotary encoder located between the turntable body 20 and the slewing bearing 10.

[0058] The turntable body 20 is located above the substrate 100 of the sample injector, and the slewing bearing 10 is located in the bearing groove 200 of the substrate 100. The slewing bearing 10 includes a bearing inner ring 11 and a bearing outer ring 12. The bottom end of the bearing inner ring 11 in the vertical direction is used to be fixed to the sample injector, and the bearing outer ring 12 is used to be connected to the driving motor 300 of the sample injector. The turntable body 20 is fixedly installed with the bearing outer ring 12, so that the turntable body 20 is driven to rotate by the driving motor 300 through the bearing outer ring 12;

[0059] The magnetic rotary encoder includes a magnet 31 and a PCB board 32 which are respectively fixedly mounted on a turntable body 20 and a bearing inner ring 11; the top end surface 21 of the turntable body 20 facing away from the slewing bearing 10 is used to carry multiple samples; the magnet 31 is fixedly mounted on the bottom end surface 22 of the turntable body 20 facing the slewing bearing 10, and the PCB board 32 is fixedly mounted on the top of the bearing inner ring 11 in the vertical direction; and the magnet 31 and the PCB board 32 are both located on the axis of the slewing bearing 10 or the turntable body 20.

[0060] In general, by utilizing the height of the inner ring of the slewing bearing in the bearing groove, this embodiment fixes the PCB board of the magnetic rotary encoder on the top of the inner ring of the bearing, so that the PCB board can be placed in a relatively high position, making it difficult for it to contact the condensed water accumulated in the bearing groove.

[0061] Among them, the sample injector generally includes a horizontally arranged base plate 100, and the base plate 100 is provided with an inwardly concave bearing groove 200. Then, the rotary bearing of this embodiment is arranged in the bearing groove. The rotary bearing is specifically fixed to the sample injector through the bottom end of the bearing inner ring. The bearing outer ring of the rotary bearing is transmission-connected to the driving motor of the sample injector, and the bearing outer ring is also fixedly connected to the turntable body located above the base plate; it can be understood that in this way, the driving motor can drive the turntable body to rotate through the rotary bearing (specifically the bearing outer ring), and multiple samples can be placed above the turntable body. For example, a sample tray can be placed above the turntable body, and multiple samples are placed on the sample tray.

[0062] It can be understood that when the driving motor drives the outer ring of the bearing and drives the turntable body to rotate, the inner ring of the bearing does not rotate; wherein, the magnetic rotary encoder for controlling the rotation accuracy of the turntable body can be arranged between the turntable body and the inner ring of the bearing.

[0063] Specifically, the magnetic rotary encoder includes a magnet and a PCB board. The magnet is fixedly mounted on the bottom end surface of the turntable body facing the rotary bearing, that is, the magnet rotates with the turntable body; then, the PCB board is fixedly mounted on the top of the inner ring of the bearing in the vertical direction, that is, the PCB board does not rotate like the inner ring of the bearing; it can be understood that the PCB board can detect the changes in the magnetic field when the magnet rotates by using the Hall device installed thereon, thereby detecting the rotation angle of the turntable body.

[0064] It can be understood that through the above-mentioned structural setting, although the bearing groove on the injector substrate will still accumulate condensed water, this embodiment uses the height of the bearing inner ring to install the PCB board on the top of the bearing inner ring, which is higher than the bottom of the bearing groove, thereby solving the technical problem of short circuit caused by contact with condensed water in the bearing groove when the PCB board is in a relatively low position.

[0065] The embodiment of the present application provides a turntable assembly and an injector for an injector, the turntable assembly comprising a coaxially arranged slewing bearing and a turntable body; wherein the slewing bearing is arranged in a bearing groove of an injector substrate, the turntable body is located above the injector substrate and is fixedly connected to the bearing outer ring of the slewing bearing, and then the bearing outer ring of the slewing bearing is also transmission-connected to a driving motor of the injector; and a magnetic rotary encoder is provided between the turntable body and the slewing bearing, the magnet of the magnetic rotary encoder is fixed to the bottom end surface of the turntable body facing the slewing bearing, the PCB board of the magnetic rotary encoder is fixed to the top end of the bearing inner ring in the vertical direction, and the magnet and the PCB board are both located on the axis of the slewing bearing or the turntable body; in this way, by fixing the PCB board to the top end of the bearing inner ring, with the help of the height of the bearing inner ring in the bearing groove, the PCB board can be placed in a relatively high position and is not easily contacted with condensed water accumulated in the bearing groove, thereby solving the technical problem of short circuit of the PCB board due to contact with condensed water.

[0066] In one possible implementation, the magnetic rotary encoder includes a single-pole encoder; wherein, in a plane perpendicular to the vertical direction, the magnet 31 includes an N pole and an S pole that are relatively arranged; the PCB board 32 includes a Hall device 321, and the Hall device 321 is located in the projection area of ​​the magnet 31.

[0067] That is, it can be understood that, considering that the PCB board is fixed to the inner ring of the bearing and has a limited area, at this time, the magnetic rotary encoder can adopt a single-pole encoder, that is, the magnet includes an N pole and an S pole arranged opposite to each other in the radial direction, and then, combined with Figure 8 A plurality of Hall devices 321 may be arranged on the PCB board 32 in the projection area of ​​the magnet 31, so that the rotation angle value of the magnet can be detected by utilizing the Hall effect.

[0068] In a specific embodiment, the PCB board 32 is circular, and is fastened to the top end of the bearing inner ring 11 by a pair of first screws 41 arranged opposite to each other; and a first positioning column 111 protrudes from the top end of the bearing inner ring 11, and a positioning notch 322 is provided at the circumferential end of the PCB board 32 to cooperate with the first positioning column 111.

[0069] That is, combined Figure 7 and Figure 8 On the one hand, in order to cooperate with the installation of the inner ring of the bearing, the PCB board can be specifically set to a circular shape, and then the circular PCB board can be fastened and installed on the top end of the inner ring of the bearing by a pair of first screws arranged radially opposite to each other; on the other hand, in order to locate the circumferential position of the PCB board, a positioning notch can be set at the circumferential end of the PCB board, and accordingly, a first positioning column matching the positioning notch is set at the top end of the inner ring of the bearing.

[0070] In one possible implementation manner, in the annular area projected by the bearing outer ring 12, an abutment boss 23 protrudes from the bottom end face of the turntable body 20, and the abutment boss 23 abuts against the top end of the bearing outer ring 12, and the abutment boss 23 and the bearing outer ring 12 are fastened and installed by a second screw 42, so that the turntable body 20 is fixedly installed on the bearing outer ring 12.

[0071] Please combine Figure 6 and Fig.11 Specifically, regarding the fixed installation of the turntable body and the bearing outer ring, for example, an abutment boss can be set on the bottom end face of the turntable body facing the slewing bearing. It can be understood that the abutment boss should be located in the annular area projected by the bearing outer ring. In this way, the abutment boss 23 and the bearing outer ring 12 can be fastened and installed by setting a screw through hole 25 through a second screw 42.

[0072] In a specific embodiment, the abutting boss 23 is arranged in an annular shape, so that a concave mounting groove 24 is formed inside the abutting boss 23 , and the magnet 31 is fixed in the mounting groove 24 .

[0073] Specifically, see Fig.11 The abutment boss can be arranged in a ring shape. In this way, it can be understood that, on the one hand, a concave installation groove is formed inside the abutment boss, and the bottom surface of the installation groove can be used to install the above-mentioned magnet; on the other hand, a plurality of weight-reducing grooves 232 can be arranged on the abutment boss to reduce the weight of the turntable body.

[0074] In another specific embodiment, a second positioning column 121 protrudes from the top end of the bearing outer ring 12 , and a positioning groove 231 for the second positioning column 121 to be inserted is provided at the end of the abutting boss 23 .

[0075] That is, in order to locate the circumferential position of the turntable body, a positioning groove may be provided at the end of the abutting boss, and correspondingly, a second positioning column cooperating with the positioning groove is provided at the top end of the bearing outer ring.

[0076] In a possible implementation manner, along the vertical direction, the height of the bearing inner ring 11 is higher than the height of the bearing outer ring 12 , and the height of the bearing inner ring 11 is at least not lower than the height of the upper surface of the substrate 100 .

[0077] See also Figure 6 On the one hand, in order to ensure the accuracy of the magnetic rotary encoder, the height of the inner ring of the bearing can be set to be higher than the height of the outer ring of the bearing. In this way, combined with the above-mentioned abutment boss and mounting groove, the distance between the PCB board and the magnet can be ensured to be close, thereby ensuring the measurement accuracy.

[0078] On the other hand, in order to further ensure that the PCB board at the top of the bearing inner ring does not contact the condensed water, the height of the bearing inner ring can be set to be at least not lower than the upper surface of the substrate. It can be understood that this can minimize the contact of the PCB board with the condensed water in the bearing groove.

[0079] In one possible implementation, regarding the fixing of the bearing inner ring 11, the injector is provided with a fixing block 500 in the projection area corresponding to the bearing inner ring 11, and the bottom end of the bearing inner ring 11 along the vertical direction X is fixed by a third screw ( Figure 6 5 (not shown) is fastened and installed with the fixing block 500.

[0080] Based on the above-mentioned turntable assembly, the present application also discloses an injector, which includes a horizontally arranged base plate, a slewing bearing, a turntable body arranged above the base plate, a driving motor fixed to the base plate, and a magnetic rotary encoder arranged between the turntable body and the slewing bearing; wherein the base plate is provided with a concave bearing groove; the slewing bearing is fixedly installed in the bearing groove, the slewing bearing includes a bearing inner ring and a bearing outer ring, and the bottom end of the bearing inner ring along the vertical direction is fixed to the injector; the turntable body and the slewing bearing are coaxially arranged, and the turntable body and the bearing outer ring are fixedly installed; the driving shaft of the driving motor is located below the base plate, and the driving shaft is transmission-connected to the bearing outer ring; the magnetic rotary encoder includes a magnet and a PCB board fixedly installed on the turntable body and the bearing inner ring, respectively, the magnet is fixedly installed on the bottom end surface of the turntable body facing the slewing bearing, and the PCB board is fixedly installed on the top end of the bearing inner ring along the vertical direction; and the magnet and the PCB board are both located on the axis of the slewing bearing or the turntable body.

[0081] In one possible implementation, below the base plate, the outer ring of the bearing is connected to the drive shaft via a belt drive; wherein the outer surface of the outer ring of the bearing is provided with a first transmission tooth, and the inner surface of the belt is provided with a second transmission tooth for meshing with the first transmission tooth.

[0082] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0083] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0084] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0085] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0086] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize that some variations, modifications, changes, additions and sub-combinations thereof should be included within the scope of protection of the present utility model.

Claims

1. A turntable assembly for a sample injector, characterized in that: The turntable assembly comprises: A slewing bearing (10) and a turntable body (20) are coaxially arranged along a vertical direction (X); the turntable body (20) is located above a substrate (100) of an injector, the slewing bearing (10) is located in a bearing groove (200) of the substrate (100), the slewing bearing (10) comprises a bearing inner ring (11) and a bearing outer ring (12), the bottom end of the bearing inner ring (11) along the vertical direction (X) is used to be fixed to the injector, the bearing outer ring (12) is used to be connected to the driving motor (300) of the injector, and the turntable body (20) and the bearing outer ring (12) are fixedly installed so that the turntable body (20) is driven to rotate by the driving motor (300) through the bearing outer ring (12); A magnetic rotary encoder located between the turntable body (20) and the slewing bearing (10); the magnetic rotary encoder comprises a magnet (31) and a PCB board (32) respectively fixedly mounted on the turntable body (20) and the bearing inner ring (11); The magnet (31) is fixedly mounted on the bottom end surface (22) of the turntable body (20) facing the slewing bearing (10), and the PCB board (32) is fixedly mounted on the top end of the bearing inner ring (11) along the vertical direction (X); Furthermore, the magnet (31) and the PCB board (32) are both located on the axis of the slewing bearing (10) or the turntable body (20).

2. The turntable assembly according to claim 1, characterized in that: The magnetic rotary encoder comprises a single magnetic pole encoder; wherein, In a plane perpendicular to the vertical direction, the magnet (31) includes an N pole and an S pole arranged opposite to each other; The PCB board (32) comprises a Hall device (321), and the Hall device (321) is located within the projection area of ​​the magnet (31).

3. The turntable assembly according to claim 1, characterized in that: The PCB board (32) is circular and is fastened to the top end of the bearing inner ring (11) by a pair of first screws (41) arranged opposite to each other; a first positioning column (111) protrudes from the top end of the bearing inner ring (11), and a positioning notch (322) is provided at the circumferential end of the PCB board (32) to be mounted in cooperation with the first positioning column (111).

4. The turntable assembly according to claim 1, characterized in that: In the annular area projected by the bearing outer ring (12), the bottom end face (22) of the turntable body (20) protrudes with an abutment boss (23), and the abutment boss (23) abuts against the top end of the bearing outer ring (12), and the abutment boss (23) and the bearing outer ring (12) are fastened and installed by a second screw (42) so that the turntable body (20) is fixedly installed on the bearing outer ring (12).

5. The turntable assembly according to claim 4, characterized in that: The abutting boss (23) is arranged in an annular shape, so that a concave mounting groove (24) is formed inside the abutting boss (23), and the magnet (31) is fixed in the mounting groove (24).

6. The turntable assembly according to claim 5, characterized in that: A second positioning column (121) protrudes from the top end of the bearing outer ring (12), and a positioning groove (231) for inserting the second positioning column (121) is provided at the end of the abutting boss (23).

7. The turntable assembly according to claim 1, characterized in that: In the vertical direction, the height of the bearing inner ring (11) is higher than the height of the bearing outer ring (12), and the height of the bearing inner ring (11) is at least not lower than the height of the upper surface of the substrate (100).

8. The turntable assembly according to claim 1, characterized in that: The injector is provided with a fixing block (500) in a projection area corresponding to the bearing inner ring (11), and the bottom end of the bearing inner ring (11) along the vertical direction (X) is fixedly mounted to the fixing block (500) by a third screw.

9. A sample injector, characterized in that: The sample injector comprises: A horizontally arranged substrate (100), wherein the substrate (100) is provided with an inwardly concave bearing groove (200); A slewing bearing (10) is fixedly installed in the bearing groove (200), wherein the slewing bearing (10) comprises a bearing inner ring (11) and a bearing outer ring (12), and the bottom end of the bearing inner ring (11) along the vertical direction (X) is fixed to the sample injector; A turntable body (20) is arranged above the base plate (100), the turntable body (20) and the slewing bearing (10) are coaxially arranged, and the turntable body (20) and the bearing outer ring (12) are fixedly installed; A driving motor (300) fixed to the base plate (100), wherein a driving shaft of the driving motor (300) is located below the base plate (100), and the driving shaft is drivingly connected to the outer ring of the bearing (12); A magnetic rotary encoder is provided between the turntable body (20) and the slewing bearing (10), and the magnetic rotary encoder comprises a magnet (31) and a PCB board (32) respectively fixedly mounted on the turntable body (20) and the bearing inner ring (11), wherein the magnet (31) is fixedly mounted on the bottom end surface (22) of the turntable body (20) facing the slewing bearing (10), and the PCB board (32) is fixedly mounted on the top end of the bearing inner ring (11) along the vertical direction (X); and the magnet (31) and the PCB board (32) are both located on the axis of the slewing bearing (10) or the turntable body (20).

10. The sample injector according to claim 9, characterized in that: Below the base plate (100), the outer ring of the bearing (12) and the driving shaft are connected via a belt (400); The outer surface of the bearing outer ring (12) is provided with a first transmission tooth (122), and the inner surface of the belt (400) is provided with a second transmission tooth for engaging with the first transmission tooth (122).

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