CN218445538U - Positioning device - Google Patents

Abstract

The utility model discloses a positioning device, which comprises a driving component, a centrifugal component and a detection component, wherein the driving component comprises a rotary driving piece; the centrifugal assembly comprises a disc joint and a disc, the disc joint is arranged on an output shaft of the rotary driving piece, and the disc is in splicing fit with the disc joint so that the rotary driving piece drives the disc to rotate through the disc joint; the disc is provided with a detection hole for detecting the detection assembly so as to identify the position information of the disc. The rotary driving piece drives the disc to rotate through the disc joint, when the detection hole rotates from the upper part of the detection assembly, the detection signal of the detection assembly changes, the control module identifies the signal change of the detection assembly and obtains the initial position information of the disc according to the information provided by the rotary driving piece, and the disc is more convenient to rotate to the specified position to determine the initial position information of the disc when the disc is placed.

Description

Positioning device

Technical Field

The utility model relates to a sample analysis technical field especially relates to a positioner.

Background

At present, centrifugal disks on the market are generally placed in two ways, wherein one way is that an automatic in-and-out bin mechanism is arranged, the disks need to be placed at specific positions in the circumferential direction, and the disks have relative position requirements with a centrifugal motor after being placed; the automatic warehouse entry and exit mechanism is not provided, the disk is placed in the opening cover, the disk also needs to be placed according to a specific position, the operation is inconvenient, and the user experience is poor.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a positioner aims at solving the inconvenient technical problem of placing of current centrifugal tray.

In order to achieve the above object, the present invention provides a positioning device, comprising:

a drive assembly including a rotary drive;

the centrifugal assembly comprises a disc joint and a disc, the disc joint is arranged on an output shaft of the rotary driving piece, and the disc is in inserted fit with the disc joint so that the rotary driving piece drives the disc to rotate through the disc joint;

the disc is provided with a detection hole for detection of the detection assembly;

and the control module is respectively electrically connected with the rotary driving piece and the detection assembly and is used for acquiring the position information of the disc through the detection assembly and the rotary driving piece.

In an embodiment, a central shaft and first positioning teeth are disposed at an end of the disk joint away from the rotary driving member, the disk is provided with a positioning hole through which the central shaft passes and a plurality of second positioning teeth disposed at intervals along a circumferential direction of the positioning hole on a side of the disk facing the rotary driving member, a positioning tooth socket is formed between any two adjacent second positioning teeth, and the first positioning teeth are in insertion fit with the positioning tooth sockets, so that the first positioning teeth circumferentially position the positioning tooth sockets.

In an embodiment, a side of the first positioning tooth, which is far away from the rotary driving member, is provided with a first guide surface, and the second positioning tooth is provided with a second guide surface for guiding the first positioning tooth to be inserted into the positioning tooth slot.

In an embodiment, the first positioning tooth includes a first guiding portion and a first positioning portion connected to each other, the first positioning portion is connected to the disk joint, and the first guiding portion is tapered from the rotary driving member toward the disk joint, so that the first guiding surface is formed at an end of the first guiding portion away from the first positioning portion.

In an embodiment, the second positioning tooth includes a second guiding portion and a second positioning portion that are connected to each other, any two adjacent second positioning portions form the positioning tooth socket, the second positioning portion is connected to the disk, and the second guiding portion is arranged in a tapered manner from the second positioning portion to the disk joint, so that one end of the second guiding portion, which is far away from the second positioning portion, forms the second guiding surface.

In one embodiment, a side of the disk facing the rotary driving member is provided with a first groove for accommodating a plurality of the second positioning teeth, and the first groove is divided into a plurality of the positioning tooth grooves by the plurality of the second positioning teeth.

In an embodiment, the positioning apparatus further includes a carrying assembly, the carrying assembly includes a carrying driving member and a supporting member for supporting the disk, the supporting member is located between the disk and the detecting assembly, and the supporting member is provided with a light hole corresponding to the detecting assembly, so that the detecting assembly detects the detecting hole through the light hole; the detection hole is arranged close to the outer edge of the disc.

In an embodiment, the supporting member is a tray, a second groove for accommodating the disk is formed in one side of the tray away from the rotary driving member, and an avoiding hole for the disk joint to pass through is formed in a bottom wall of the second groove.

In one embodiment, a sample adding slot and a sample sucking slot are arranged at one side of the disk far away from the rotary driving member at intervals, and the disk is further provided with a channel for communicating the bottom of the sample adding slot with the bottom of the sample sucking slot.

In an embodiment, the driving assembly further includes a mounting frame, the rotary driving member is mounted on the mounting frame, the detecting assembly includes a fixing frame and a detecting member, which are connected to each other, the fixing frame is mounted on the mounting frame, and the detecting member is used for detecting the detecting hole.

The above technical scheme, in the above technical scheme, when centrifugal disc is placed to needs, the user need not place the disc rotation to specific position, but can directly connect grafting cooperation with the disc, wherein disc and disc joint grafting cooperation can set up the location tooth for one side that the disc connects towards the disc, the constant head tank has been seted up towards one side of disc to the disc joint, location tooth and constant head tank grafting cooperation, also can be the constant head tank is seted up towards one side that the disc connects towards the disc, disc joint has been seted up towards one side of disc and has been cooperated the location tooth with constant head tank grafting, the disc is direct to connect grafting cooperation with the disc, the rotary driving piece drives the disc rotation through the disc joint, it passes above the detection module to rotate when the inspection hole, the detection signal of detection module changes, thereby the control module discerns the signal change of detection module and obtains the initial position information of disc according to the information that the rotary driving piece provided again, compare in prior art through rotating the initial position information that the assigned position of disc confirmed to the disc when placing the disc, directly peg graft on the disc joint, through the detection module, it is more convenient to rotate and initial position information that the control module obtained the disc.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained by the structures shown in the drawings without creative efforts.

Fig. 1 is an exploded view of a positioning device according to an embodiment of the present invention;

FIG. 2 is a schematic view of a supporting member according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a disc joint according to an embodiment of the present invention;

FIG. 4 is a schematic view of the disk joint of FIG. 3 from another perspective;

FIG. 5 is a schematic view of a disc according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a part of the structure of a disk according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of the structure of a positioning device according to an embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of a positioning device according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a part of the structure of a positioning device according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of a part of the structure of a positioning device according to an embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of a part of the structure of a positioning device according to an embodiment of the present invention.

The reference numbers illustrate:

the purpose of the present invention, its functional features and advantages will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper and lower 8230; etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in fig. 1), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" can include at least one of that feature either explicitly or implicitly.

Moreover, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are combined and contradicted with each other or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and the present invention is not within the protection scope of the present invention.

The utility model provides a positioning device 1, as shown in fig. 1, the positioning device 1 comprises a driving component 11, a centrifugal component 12 and a detection component 13, wherein the driving component 11 comprises a rotary driving piece 111; the centrifugal assembly 12 comprises a disk joint 121 and a disk 122, the disk joint 121 is mounted on the output shaft of the rotary driving member 111, and the disk 122 is in plug fit with the disk joint 121, so that the rotary driving member 111 drives the disk 122 to rotate through the disk joint 121; the disk 122 is provided with a detection hole 14 for detecting by the detection component 13, so as to identify the position information of the disk 122.

When the disc 122 needs to be placed, the user does not need to rotate the disc 122 to a specific position for placing, but can directly insert and match the disc 122 with the disc joint 121, where the disc 122 and the disc joint 121 are inserted and matched, a positioning tooth is formed on one side of the disc 122 facing the disc joint 121, a positioning groove is formed on one side of the disc joint 121 facing the disc 122, the positioning tooth is inserted and matched with the positioning groove, or a positioning groove is formed on one side of the disc 122 facing the disc joint 121, a positioning tooth is formed on one side of the disc joint 121 facing the disc 122, the disc 122 is directly inserted and matched with the disc joint 121, the rotary driving member 111 drives the disc 122 to rotate through the disc joint 121, when the detection hole 14 rotates from above the detection member 13, the detection signal of the detection member 13 changes, the control module recognizes the signal change of the disc 13 and obtains the initial position information of the disc 122 according to the information provided by the rotary driving member 111, and compared with the prior art, the initial position information of the disc 122 is more convenient to obtain by inserting the disc 122 into the disc joint 122 and the initial position information of the rotary driving member 121. It should be noted that the rotary driving element 111 may be a servo motor, and an encoder of the servo motor is electrically connected to the control module. The control module is used for acquiring information transmitted by the encoder so as to obtain the rotation angle of the servo motor; the rotary driving part 111 can also be a direct current motor, the rotary driving part 111 further comprises an encoder electrically connected with the direct current motor, and the encoder is electrically connected with the control module; in addition, positioning code teeth can be designed on the disk 122, and the rotation angle of the disk 122 can be accurately positioned by additionally arranging a positioning optical coupler electrically connected with the control module. It should be noted that the detection hole 14 is disposed on the disk 122, that is, the initial position of the disk 122 is designed on the disk 122, and the disk 122 is directly positioned, so as to obtain the position information of the disk 122, and no intermediate component is used for transmission, so that the positioning accuracy is higher.

As shown in fig. 3 and 4, a central shaft 19 and first positioning teeth 15 are disposed at one end of the disk joint 121 away from the rotary driving member 111, the disk 122 is provided with a positioning hole 27 for the central shaft 19 to pass through and a plurality of second positioning teeth 16 disposed at intervals along the circumferential direction of the positioning hole 27 on one side of the disk 122 facing the rotary driving member 111, a positioning tooth slot 20 is formed between any two adjacent second positioning teeth 16, and the first positioning teeth 15 are in insertion fit with the positioning tooth slots 20, so that the first positioning teeth 15 are circumferentially positioned with respect to the positioning tooth slots 20. Through setting up center pin 19 for after location tooth's socket 20 on the disk 122 and first location tooth 15 are pegged graft and are cooperated, center pin 19 passes locating hole 27, and center pin 19 carries out radial positioning to disk 122, thereby carries out circumference location to disk 122 through the grafting cooperation of first location tooth 15 and location tooth's socket 20 and transmits the moment of torsion, compares in prior art and passes through plane friction transmission moment of torsion, and the grafting cooperation of first location tooth 15 and location tooth's socket 20 is fixed a position and can not take place the phenomenon of skidding. The positioning tooth slot 20 circumferentially positions the first positioning tooth 15, and the slot wall of the positioning tooth slot 20 may be completely abutted against the tooth wall of the first positioning tooth 15 to transmit torque; it is also possible that the slot wall of the positioning tooth slot 20 is in abutment with the tooth wall portion of the first positioning tooth 15 for torque transmission.

As shown in fig. 4, the side of the first positioning tooth 15 away from the rotary driving member 111 is provided with a first guiding surface 154, and the second positioning tooth 16 is provided with a second guiding surface 164 for guiding the first positioning tooth 15 to be inserted into the positioning slot 20. By arranging the first guide surface 154 on the first positioning tooth 15 and the second guide surface 164 on the second positioning tooth 16, after the user passes the central shaft 19 through the positioning hole 27, the user can release the disk 122, the disk 122 slides downwards along the axial direction of the central shaft 19 under the guiding action of the central shaft 19 until the first guide surface 154 abuts against the second guide surface 164, and the first positioning tooth 15 slides into the positioning tooth slot 20 smoothly under the guiding action of the first guide surface 154 and the second guide surface 164, so that the insertion and matching of the first positioning tooth 15 and the positioning tooth slot 20 is completed, and the user does not need to align and insert the positioning tooth slot 20 with the first positioning tooth 15, i.e. an operator can take the disk 122 in a manner similar to that an optical disk drive is put in, so as to conveniently position the disk 122, even if the positioning tooth slot 20 of the disk 122 deviates from the position of the first positioning tooth 15, the disk 122 can slide into the positioning tooth slot 20 smoothly under the gravity action of the disk 122, and the user experiences the user. It should be noted that the second positioning teeth 16 are uniformly spaced along the circumferential direction of the positioning hole 27.

According to the utility model discloses an embodiment, the quantity of first location tooth 15 is a plurality of, and a plurality of first location teeth 15 set up along the even interval of circumference of center pin 19 to be close to the outward flange setting of dish joint 121, through setting up a plurality of first location teeth 15, thereby improve the joint strength of dish joint 121 and disc 122, improve the reliability that disc 122 and dish joint 121 are connected.

As shown in fig. 9 to 11, the first positioning tooth 15 includes a first guide portion 152 and a first positioning portion 151 connected to each other, the first positioning portion 151 is connected to the disk joint 121, and the first guide portion 152 is tapered from the rotary driving member 111 toward the disk joint 121, so that a first guide surface 154 is formed at one end of the first guide portion 152 away from the first positioning portion 151. The first guiding portion 152 is tapered such that the top surface of the first guiding portion 152 forms two first guiding surfaces 154, so that the first positioning teeth 15 can enter the positioning teeth slots 20 under the guidance of the first guiding surfaces 154 and the second guiding surfaces 164 no matter which first guiding surfaces 154 abut the second guiding surfaces 164.

As shown in fig. 5 and 6, the second positioning tooth 16 includes a second guiding portion 162 and a second positioning portion 161 connected to each other, any two adjacent second positioning portions 161 form a positioning tooth slot 20, the second positioning portion 161 is connected to the disk 122, the second guiding portion 162 is tapered from the second positioning portion 161 toward the disk joint 121, so that one end of the second guiding portion 162 away from the second positioning portion 161 forms a second guiding surface 164. The second positioning portion 161 is tapered, so that two second guiding surfaces 164 are formed on the bottom surface of the second positioning portion 161, thereby enhancing the guiding effect of the second guiding surfaces 164 on the first guiding surfaces 154, and further facilitating the guiding of the first positioning teeth 15 into the positioning tooth slots 20.

According to the utility model discloses an embodiment, the handing-over department of two first spigot surfaces 154 of first location tooth 15 is provided with first fillet 155, and the handing-over department of two second spigot surfaces 164 of second location tooth 16 is provided with second fillet 165, through setting up first fillet 155 and second fillet 165, is convenient for guide first spigot surface 154 and second spigot surface 164 butt still further to make first location tooth 15 slide into in the location tooth's socket 20 under the guide effect of first spigot surface 154 and second spigot surface 164.

According to the utility model discloses another embodiment, first location portion 151 is first locating surface 153 towards the both sides wall of second location portion 161, second location portion 161 is second locating surface 163 towards the both sides wall of location tooth's socket 20, when first location tooth 15 and the cooperation of pegging graft of location tooth's socket 20, first locating surface 153 and the second locating surface 163 butt that encloses into this location tooth's socket 20, thereby realize the circumference location to disk 122, again because first locating surface 153 and second locating surface 163 are vertical setting, consequently first locating surface 153 and second locating surface 163 can transmit the moment of torsion, thereby rotary driving spare 111 can drive disk 122 through disk joint 121 and rotate.

As shown in fig. 5 and 6, a side of the disk 122 facing the rotary driving member 111 is provided with a first groove 17 accommodating a plurality of second positioning teeth 16, and the plurality of second positioning teeth 16 divide the first groove 17 into a plurality of positioning teeth slots 20. By arranging the first groove 17, the groove wall of the first groove 17 also has a certain limiting effect on the first positioning teeth 15, so that the positioning reliability of the positioning tooth grooves 20 and the first positioning teeth 15 is improved; in addition, the first groove 17 for accommodating the second positioning tooth 16 is arranged so that the second positioning tooth 16 does not protrude outwards relative to the bottom surface of the disk 122, thereby preventing the hand of the user from being scratched when contacting the tip part of the second positioning tooth 16 when the user takes the disk 122.

As shown in fig. 2, fig. 7 and fig. 8, the positioning apparatus 1 further includes a carrying assembly, the carrying assembly includes a carrying driving member and a supporting member 21 for supporting the disk 122, the supporting member 21 is located between the disk 122 and the detecting assembly 13, the supporting member 21 is provided with a light hole 26 corresponding to the detecting assembly 13, so that the detecting assembly 13 detects the detecting hole 14 through the light hole 26; the detection hole 14 is disposed near the outer edge of the disk 122. Wherein, the transport driving piece can be arm or lift driving piece, and the lift driving piece can be elevator motor or cylinder etc.. Before the test is started, the operator operates the conveying driving member to convey the supporting member 21 to the position where the disk 122 is placed by the operator, so that the operator can place the disk 122 on the supporting member 21, and then the operator conveys the disk 122 to the position above the disk joint 121 through the conveying driving member, so that the central shaft 19 and the positioning hole 27 are coaxially arranged, and then the conveying driving member drives the supporting member 21 to move downwards, so that the central shaft 19 passes through the positioning hole 27, and the first positioning tooth 15 is inserted into the positioning tooth slot 20 under the guiding action of the first guiding surface 154 and the second guiding surface 164. It should be noted that the supporting member 21 may be two forks like a forklift.

According to the present invention, the outer edge of the notch of the first groove 17 is provided with the third guiding surface 171, the top end of the central shaft 19 is provided with the fourth guiding surface 191 for abutting against the third guiding surface 171 and guiding the central shaft 19 to pass through the positioning hole 27, the transportation driving member driving support 21 descends by setting the third guiding surface 171 and the fourth guiding surface 191, so as to drive the disc 122 to descend, and the positioning hole 27 of the disc 122 is smoothly passed through by the central shaft 19 under the guiding of the third guiding surface 171 and the fourth guiding surface 191. The top end of the central shaft 19 is tapered such that the side wall of the central shaft 19 near the top end forms a third guide surface 171.

The supporting member 21 is a tray, a second groove 18 for accommodating the disk 122 is formed on a side of the tray away from the rotary driving member 111, and an avoiding hole 22 for the disk joint 121 to pass through is formed in a bottom wall of the second groove 18. The second groove 18 is formed in the tray to center the disc 122 located in the second groove 18, so that the central shaft 19 passes through the avoiding hole 22 and the positioning hole 27 in sequence.

According to the utility model discloses an embodiment, the outward flange of the notch of second recess 18 is provided with fifth guiding surface 181, and fifth guiding surface 181 is used for guiding disk 122 to get into in second recess 18, and the operating personnel of being convenient for puts into second recess 18 with disk 122.

As shown in FIGS. 1 and 7, the side of the disk 122 away from the rotary drive member 111 is provided with a sample addition slot 23 and a sample suction slot 24 at intervals, and the disk 122 is further provided with a channel 25 communicating the bottom of the sample addition slot 23 and the bottom of the sample suction slot 24. Through setting up the passageway 25 that communicates application of sample groove 23 and inhale appearance groove 24 for application of sample groove 23, inhale appearance groove 24 and passageway 25 have constituted the linker jointly, and application of sample groove 23 is close to disc 122 edge setting and is convenient for the application of sample, inhales appearance groove 24 and is close to locating hole 27 setting and is convenient for inhale the appearance.

According to the utility model discloses an embodiment, the quantity of application of sample groove 23 is a plurality of, inhales the quantity of appearance groove 24 and passageway 25 and application of sample groove 23 one-to-one setting to make and inhale the appearance from a plurality of interior of inhaling appearance groove 24 simultaneously. It should be noted that, because the sample adding slot 23 and the sample sucking slot 24 are disposed on the disk 122, the positions of the sample adding slot 23 and the sample sucking slot 24 relative to the disk 122 are fixed, after the control module obtains the information of the encoder of the rotary driving member 111 and the signal conversion of the detecting module 13, the initial position information of the disk 122 can be obtained, and further the position information of the sample adding slot 23 and the sample sucking slot 24 can be grasped, so that the circumferential positions of the sample adding slot 23 and the sample sucking slot 24 can be accurately positioned, and further the disk 122 can be driven to rotate to a required position by the rotary driving member 111 for sample adding or sample sucking, after the disk 122 sample is used up, the driving member is carried to drive the tray to ascend, the disk 122 is lifted to the position where the disk 122 is placed, and an operator takes out the old disk 122, and then places a new disk 122 into the second groove 18, and starts a new round of testing. It should be noted that the second positioning teeth 16, the positioning tooth grooves 20, the sampling grooves, the sample suction grooves 24, and the channels 25 are disposed in a one-to-one correspondence relationship.

As shown in fig. 1, the driving assembly 11 further includes a mounting frame 112, the rotary driving member 111 is mounted on the mounting frame 112, the detecting assembly 13 includes a fixing frame 132 and a detecting member 131 which are connected to each other, the fixing frame 132 is mounted on the mounting frame 112, and the detecting member 131 is used for detecting the detecting hole 14. The detection piece 131 can be a photoelectric sensor, photoelectric sensor is located the tray below, light trap 26 corresponds photoelectric sensor setting, make photoelectric sensor's detection light beam can be from light trap 26 outgoing to disc 122, thereby be used for detecting the inspection hole 14 and pass through from light trap 26 top, if inspection hole 14 passes through from light trap 26 top, can cause the photoelectric sensor signal to change, the control module group passes through photoelectric sensor's signal change and the information of encoder transmission, obtain the positional information of disc 122, and then the accurate positional information who grasps sample suction groove 24 and application of sample groove 23. It should be noted that, the detection hole 14 is disposed near the outer edge of the disk 122, and compared with the detection hole 14 disposed near the positioning hole 27 of the disk 122, the positioning accuracy of the disk 122 is higher, and the position of the disk 122 can be grasped more accurately.

The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation of the content of the specification and the attached drawings is utilized, or the direct/indirect application is included in other related technical fields in the protection scope of the present invention.

Claims (10)

1. A positioning device, comprising:

a drive assembly including a rotary drive;

the centrifugal assembly comprises a disc joint and a disc, the disc joint is arranged on an output shaft of the rotary driving piece, the disc is in plug-in fit with the disc joint, and the rotary driving piece is used for driving the disc to rotate through the disc joint;

the disc is provided with a detection hole for detection of the detection assembly;

and the control module is respectively electrically connected with the rotary driving piece and the detection assembly and is used for acquiring the position information of the disc through the detection assembly and the rotary driving piece.

2. The positioning device according to claim 1, wherein a central shaft and first positioning teeth are disposed at an end of the disk joint away from the rotary driving member, the disk is provided with a positioning hole for the central shaft to pass through, and a plurality of second positioning teeth disposed at intervals along a circumferential direction of the positioning hole on a side of the disk facing the rotary driving member, a positioning tooth socket is formed between any two adjacent second positioning teeth, and the first positioning teeth are engaged with the positioning tooth sockets so that the first positioning teeth circumferentially position the positioning tooth sockets.

3. The positioning device as set forth in claim 2, wherein a side of said first positioning tooth remote from said rotary driving member is provided with a first guide surface, and said second positioning tooth is provided with a second guide surface for guiding said first positioning tooth to be inserted into said positioning spline.

4. The positioning device of claim 3, wherein the first positioning tooth includes a first guide portion and a first positioning portion connected to each other, the first positioning portion is connected to the disk joint, and the first guide portion is tapered from the rotary driving member toward the disk joint such that an end of the first guide portion away from the first positioning portion forms the first guide surface.

5. The positioning device according to claim 3, wherein the second positioning tooth includes a second guiding portion and a second positioning portion connected to each other, any two adjacent second positioning portions form the positioning tooth slot, the second positioning portion is connected to the disk, and the second guiding portion tapers from the second positioning portion toward the disk joint, so that one end of the second guiding portion away from the second positioning portion forms the second guiding surface.

6. A positioning device as claimed in claim 2, wherein a side of the disc facing the rotary drive member is provided with a first recess for receiving a plurality of said second positioning teeth, the plurality of said second positioning teeth dividing the first recess into a plurality of said positioning splines.

7. The positioning device according to any one of claims 1 to 6, further comprising a carrying assembly, wherein the carrying assembly comprises a carrying driving member and a supporting member for supporting the disk, the supporting member is located between the disk and the detecting assembly, and the supporting member is provided with a light hole corresponding to the detecting assembly, so that the detecting assembly can detect the detecting hole through the light hole; the detection hole is arranged close to the outer edge of the disc.

8. The positioning apparatus as set forth in claim 7, wherein the supporting member is a tray, a second groove for accommodating the disk is formed on a side of the tray away from the rotary driving member, and an avoiding hole for the disk joint to pass through is formed on a bottom wall of the second groove.

9. The positioning device according to any one of claims 1 to 6, wherein a sample application slot and a sample suction slot are spaced apart from one side of the disk away from the rotary driving member, and the disk is further provided with a channel communicating the bottom of the sample application slot and the bottom of the sample suction slot.

10. The positioning apparatus as set forth in any one of claims 1 to 6, wherein the driving assembly further comprises a mounting bracket, the rotary driving member is mounted on the mounting bracket, the detecting assembly comprises a fixing bracket and a detecting member connected with each other, the fixing bracket is mounted on the mounting bracket, and the detecting member is used for detecting the detecting hole.

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