CN218842114U

CN218842114U - Pressing component and equipment for kit

Info

Publication number: CN218842114U
Application number: CN202222538929.2U
Authority: CN
Inventors: 胡军荣; 金立峰; 陈思
Original assignee: Hangzhou Zhunxin Biotechnology Co ltd
Current assignee: Hangzhou Zhunxin Biotechnology Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-04-11
Anticipated expiration: 2032-09-20

Abstract

The utility model discloses a pressing component for a kit, which comprises a mounting seat, a driving mechanism and a pressing plate, wherein the driving mechanism is arranged on the mounting seat, the pressing plate is driven by the driving mechanism to press the kit, a cam mechanism is arranged between the driving mechanism and the pressing plate, the cam mechanism comprises an eccentric cam and a transmission part, the eccentric cam is arranged on the driving mechanism, and the eccentric cam is driven to do eccentric rotation motion around a set axis; the transmission part is arranged between the pressing plate and the eccentric cam, the transmission part drives the pressing plate to do reciprocating linear motion along the vertical direction under the driving of the eccentric cam, and the pressing plate presses the reagent box downwards in the descending process. A hold-down apparatus having the hold-down assembly mounted thereto is also disclosed. Use the utility model discloses can ensure that the reciprocating motion stroke of the clamp plate that receives its drive remains unchanged, also realize the purpose of accurate control clamp plate reciprocating motion stroke, avoid the clamp plate to push down not in place or excessively push down the kit.

Description

Pressing component and equipment for kit

Technical Field

The utility model belongs to biological detection instrument field especially relates to a kit is with pushing down subassembly and equipment.

Background

The PCR amplification technology is widely applied to the detection of biological samples (such as saliva, blood, urine and the like) and has important application in the aspect of infectious disease detection. In order to avoid the contamination of the reagent, the related art designs a reagent cartridge having two parts that can slide relative to each other. The reagent is sealed in the reagent tube before detection and is placed in one part of the reagent kit, and the sealing structure on the reagent tube is punctured by a puncturing structure arranged in the other part of the reagent kit when detection is carried out, so that cross contamination of nucleic acid amplification products can be prevented. Therefore, a pressing mechanism is required to press the reagent cartridge, and a linear driving mechanism is generally used in the related art to drive the pressing plate to perform reciprocating linear motion so as to press the reagent cartridge. During actual operation, the requirement on the accuracy of the pressing operation of the reagent kit is very high, namely, the reciprocating travel of the pressing plate needs to be accurately controlled, and the pressing mechanism in the related art is difficult to meet the requirement. If the stroke is smaller than the designed stroke, the pressing of the reagent box is not in place; if the stroke is larger than the design stroke, the reagent cartridge is excessively pressed. Whether the reagent tube is pressed down insufficiently or excessively, the subsequent reagent pumping operation in the reagent tube may not be smooth.

In addition, the following problems also exist in the related art: whether the reagent kit is pressed in place cannot be seen visually, and whether the state of the reagent kit meets the requirement of performing the subsequent detection step cannot be determined after the pressing operation is completed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem in the above-mentioned correlation technique to a certain extent at least, for this reason, the utility model discloses a following technical scheme: a pressing component for a reagent box comprises a mounting seat, a driving mechanism and a pressing plate, wherein the driving mechanism is arranged on the mounting seat, the pressing plate is driven by the driving mechanism to press down the reagent box, a cam mechanism is arranged between the driving mechanism and the pressing plate and comprises an eccentric cam and a transmission part, the eccentric cam is arranged on the driving mechanism, and the eccentric cam is driven to do eccentric rotation motion around a set axis; the transmission part is arranged between the pressing plate and the eccentric cam, the transmission part drives the pressing plate to do reciprocating linear motion along the vertical direction under the driving of the eccentric cam, and the pressing plate presses the reagent kit downwards in the descending process.

The utility model discloses following beneficial effect has:

1. the driving mechanism drives an eccentric cam in the cam mechanism to do eccentric rotation motion around a set axis, the eccentric cam drives a pressing plate to do reciprocating linear motion through a transmission piece, and the pressing plate presses the reagent kit in the descending process;

2. because the eccentric cam rotates around the set axis under the driving of the driving mechanism, the rotating track of the eccentric cam is stable, the reciprocating moving stroke of the pressing plate driven by the eccentric cam is kept unchanged, the purpose of accurately controlling the reciprocating moving stroke of the pressing plate is realized, and the pressing plate is prevented from pressing the reagent box incompletely or excessively.

Preferably, the transmission part is a rectangular frame, the eccentric cam is in abutting contact with the upper section and the lower section of the rectangular frame in the eccentric rotation process, and the rectangular frame is fixedly connected with the pressing plate. The pressing plate can be driven to do reciprocating linear motion by the cooperation of the eccentric cam and the rectangular frame, and then the pressing operation of the kit is realized.

Preferably, the eccentric cam comprises an eccentric block and a rolling section rotatably arranged on the eccentric block, the rolling section extends into the rectangular frame, and the rolling section is in rolling abutting contact with the upper section and the lower section of the rectangular frame in the eccentric rotation motion process. Through setting up rolling section and rectangle frame to roll and support the pressure contact, can make the frictional action between the two very little, the wearing and tearing that cause just can be ignored, just so can not exert an influence to the reciprocating motion stroke of clamp plate, further promote the precision of clamp plate reciprocating motion stroke.

Preferably, an installation shaft is arranged on the eccentric block, the rolling section is a bearing, and an inner ring of the bearing is installed in interference fit with the installation shaft.

Preferably, the transmission part comprises a connecting shaft, and the connecting shaft is provided with a bearing; the eccentric cam comprises a first cam, the first cam is provided with a groove, a second cam is arranged in the groove, an actuating groove is formed between the first cam and the second cam, the bearing extends into the actuating groove, and the outer ring of the bearing is in rolling fit with the inner wall of the actuating groove. The inner wall of the actuating groove is matched with the connecting shaft and the bearing to drive the pressing plate to realize reciprocating linear motion; meanwhile, the bearing and the inner wall of the actuating groove are in rolling fit, and the friction force between the bearing and the inner wall of the actuating groove is very small, so that the reciprocating movement stroke of the pressing plate cannot be influenced.

Preferably, the transmission part further comprises a push plate, a push plate is arranged at one end of the connecting shaft, the push plate is arranged on the pressing plate, an elastic part used for adjusting the distance between the push plate and the pressing plate is arranged between the push plate and the pressing plate, and the elastic part enables the push plate and the pressing plate to have a relatively far-away trend to apply force to the push plate and the pressing plate.

Preferably, the transmission part further comprises a push plate, the connecting shaft is arranged on the push plate, the push plate and the press plate are arranged at an interval from top to bottom, and the push plate and the press plate are fixedly connected through a bolt.

Preferably, a guide post for limiting the moving direction of the pressure plate is arranged between the pressure plate and the mounting seat. The moving direction of the pressing plate is guided by the guide columns, the pressing plate is prevented from shaking along the moving direction, the acting force direction of the pressing plate on the reagent box is kept unchanged, and the deviation of a relative sealing structure of a puncture structure in the reagent box is avoided.

Preferably, the pressing plate is arranged below the mounting seat, and the mounting seat is provided with a through hole for the transmission part to pass through.

Preferably, a stroke detection assembly is arranged on the mounting plate and comprises two groups of photoelectric couplers which are arranged at intervals up and down along the vertical direction, and each group of photoelectric couplers comprises a light emitting source and a light receiver; the light barrier is arranged on the transmission piece and performs reciprocating linear motion along with the transmission piece, and the two ends of the stroke of the reciprocating linear motion of the light barrier are respectively provided with a first position and a second position; when the light barrier is located at the first position, the light barrier extends into a position between the light emitting source and the light receiving device which are located above; when the light barrier is located at the second position, the light barrier extends into a position between the light emitting source and the light receiving device which are located below. The reciprocating travel of the pressing plate is detected by the travel detection assembly, if the travel of the pressing plate does not reach the set travel, namely, when the reagent kit is not pressed down in place, the light barrier which synchronously acts with the pressing plate cannot move to the position below between the light emitting source and the light receiving device, and therefore the condition can be detected through the photoelectric coupler. That is, the stroke detection component can judge whether the stroke of the pressure plate is in place.

The utility model discloses following technical scheme has still been adopted: a pressing device for a kit comprises a base, wherein a station for placing the kit is arranged on the base, and the base is also provided with a pressing component for the kit, which is provided with any one of the technical schemes; the mounting seat can be arranged on the base in a sliding mode, the mounting seat comprises a pressing position and an avoiding position, when the mounting seat slides to the pressing position, the pressing plate is located right above the station, and when the mounting seat slides to the avoiding position, the pressing assembly is mutually staggered along the projection of the vertical direction and the station. Because this equipment of pushing down has adopted foretell push down the subassembly, can control the reciprocating motion stroke of clamp plate accurately, and then ensure that the clamp plate pushes down the kit in place and can not excessively push down.

Additional aspects and advantages of the 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.

Drawings

FIG. 1 is a schematic view of a push-down assembly for a reagent cartridge according to one embodiment;

FIG. 2 is an exploded view of the hold-down assembly in accordance with one embodiment;

FIG. 3 is a schematic view showing a structure of a cam mechanism according to an embodiment;

FIG. 4 is a schematic view of another perspective of the hold-down assembly according to one embodiment;

FIG. 5 is a schematic structural view of a cam mechanism according to a second embodiment;

FIG. 6 is a schematic view showing the connection between the cam mechanism and the pressure plate in the third embodiment;

FIG. 7 is an exploded view of the cam mechanism and the pressure plate in the third embodiment;

fig. 8 is a schematic structural view of a push-down apparatus for a cartridge according to a fourth embodiment.

Wherein: 1. the device comprises a mounting base, 10 penetrating holes, 11 guide posts, 2 driving mechanisms, 3 cam mechanisms, 30 eccentric cams, 300 eccentric blocks, 301 rolling sections, 302 first cams, 303 second cams, 304 actuating grooves, 31 rectangular frames, 32 connecting shafts, 320 bearings, 33 push plates, 4 press plates, 40 bolts, 5 stroke detection assemblies, 50 photoelectric couplers, 6 light baffles, 7 bases and 70 stations.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.

Embodiments of the present invention are described below with reference to the drawings.

The first embodiment is as follows: the present embodiment provides a reagent cartridge push-down assembly, as shown in fig. 1 to 3, which includes a mounting base 1, a driving mechanism 2 and a pressing plate 4, wherein the driving mechanism 2 is disposed on the mounting base 1, and the pressing plate 4 is driven by the driving mechanism 2 to push down the reagent cartridge. In the embodiment, the cam mechanism 3 is arranged between the driving mechanism 2 and the pressing plate 4, and the rotating motion of the output end of the driving mechanism 2 is converted into the reciprocating linear motion of the pressing plate 4 through the cam mechanism 3. Specifically, the cam mechanism 3 comprises an eccentric cam 30 and a transmission piece, the eccentric cam 30 is arranged on the driving mechanism 2, and the eccentric cam 30 is driven to do eccentric rotation motion around a set axis; the transmission piece is arranged between the pressing plate 4 and the eccentric cam 30, the transmission piece drives the pressing plate 4 to do reciprocating linear motion along the vertical direction under the driving of the eccentric cam 30, and the pressing plate 4 presses the reagent kit downwards in the descending process. This push down the subassembly and drive clamp plate 4 through cam mechanism 3 and carry out reciprocal linear motion, because eccentric cam 30 is rotatory around the axis of setting under the drive of actuating mechanism 2, its rotation track is stable, can ensure to receive the reciprocating motion stroke of clamp plate 4 that its drove to keep unchangeable, also realizes the purpose of accurate control clamp plate 4 reciprocating motion stroke promptly, avoids clamp plate 4 to push down the kit not in place or excessively push down.

Specifically, in this embodiment, the driving mechanism 2 is a driving motor, the eccentric cam is an eccentric block 300, the transmission member is a rectangular frame 31, the output shaft of the driving mechanism 2 is in splined connection with the eccentric block 300, the eccentric block 300 extends into the rectangular frame 31, the rectangular frame 31 is fixedly connected with the pressing plate 4, and the eccentric block 300 is in abutting contact with the upper section and the lower section of the rectangular frame 31 in the eccentric rotation process. Therefore, the eccentric block 300 is matched with the rectangular frame 31 to drive the pressing plate 4 to do reciprocating linear motion, and the pressing operation of the reagent kit is further realized. It is understood that a guide post 11 for limiting the moving direction of the pressure plate 4 is provided between the pressure plate 4 and the mount 1. Specifically, the lower extreme and the clamp plate fixed connection of guide post 11 are provided with the guiding hole that supplies guide post 11 to pass on the mount pad 1 to in order to guarantee to have good guide effect, still be provided with linear bearing on the mount pad 1, guide post 11 and linear bearing slide to set up. The guide column 11 is arranged to guide the moving direction of the pressing plate 4, so that the pressing plate 4 is prevented from shaking along the moving direction, the acting force direction of the pressing plate 4 on the reagent box is kept unchanged, and the deviation of a puncture structure in the reagent box relative to a sealing structure is avoided.

In addition, before the pressing operation starts, the pressing plate 4 in the pressing assembly needs to be positioned right above the reagent cartridge, and the reagent cartridge needs to be avoided when being placed, so that the reagent cartridge is placed, and therefore, the driving mechanism 2 and the cam mechanism 3 are both arranged on the mounting seat 1 in the embodiment. Slide through mount pad 1 when subassembly avoids down in needs and dodge so that the kit is placed, place the back in place at the kit, rethread mount pad 1 slides and makes clamp plate 4 be located the kit directly over. In the present embodiment, the pressing plate 4 is disposed below the mounting base 1, and the mounting base 1 is provided with a through hole 10 for the transmission member to pass through. Because the pressing plate 4 is arranged below the mounting seat 1, the reciprocating movement of the pressing plate 4 is not blocked by the mounting seat 1, and the mounting seat 1 only needs to be provided with the through hole 10 matched with the volume of the transmission part, so that the overall size of the mounting seat 1 is reduced.

In addition, in order to accurately judge whether the reagent kit is pressed down in place, a stroke detection assembly is further arranged on the mounting plate in the embodiment. As shown in fig. 4, the stroke detecting assembly 5 includes two sets of photo-couplers 50 spaced vertically up and down, each set of photo-couplers 50 including a light emitting source and a light receiving device; the transmission piece is provided with a light barrier 6 which carries out reciprocating linear motion along with the transmission piece, and the two ends of the stroke of the reciprocating linear motion of the light barrier 6 are respectively provided with a first position and a second position; when the light barrier 6 is located at the first position, the light barrier 6 extends into the space between the light emitting source and the light receiving device; when the light barrier 6 is located at the second position, the light barrier 6 extends into a space between the light emitting source and the light receiving device located below. The reciprocating travel of the pressing plate 4 is detected by the travel detection assembly 5, and if the travel of the pressing plate 4 does not reach the set travel, that is, if the reagent kit is not pressed down in place, the light barrier 6 which synchronously acts with the pressing plate 4 cannot move to a position between the light emitting source and the light receiving device which are positioned below, so that the above condition can be detected through the photoelectric coupler 50. That is, the stroke detecting assembly 5 can judge whether the stroke of the platen 4 is in place.

Example two: this embodiment also provides a reagent cartridge hold-down member, and differs from the above-described embodiments in that the eccentric cam in this embodiment is different. Specifically, as shown in fig. 5, the eccentric cam in this embodiment includes an eccentric block 300 and a rolling section 301 rotatably disposed on the eccentric block 300, that is, the rolling section 301 performs an eccentric rotation motion along with the eccentric block 300, and the rolling section 301 extends into the rectangular frame 31, and the rolling section 301 is in rolling contact with the upper section and the lower section of the rectangular frame 31 during the eccentric rotation motion.

Based on the above difference, the rolling section 301 and the rectangular frame 31 are set to be in rolling abutting contact, so that the friction between the rolling section and the rectangular frame is very small, the abrasion caused by the rolling section and the rectangular frame is negligible, the reciprocating movement stroke of the pressing plate 4 is not affected, and the precision of the reciprocating movement stroke of the pressing plate 4 is further improved.

Further, the eccentric block 300 in this embodiment is provided with a mounting shaft, the rolling section 301 is a bearing, an inner ring of the bearing is installed in interference fit with the mounting shaft, and an outer ring of the bearing is in rolling abutting contact with the upper section and the lower section of the rectangular frame 31.

Example three: this embodiment also provides a push-down assembly for a reagent cartridge, and is different from the above-described embodiments in that the cam mechanism in this embodiment is different from that in the above-described embodiments. Specifically, as shown in fig. 6 and 7, the transmission member in the cam mechanism includes a connecting shaft 32, the connecting shaft 32 being provided with a bearing 320; the eccentric cam 30 in the cam mechanism 3 includes a first cam 302, the first cam 302 is provided with a groove, a second cam 303 is provided in the groove, and an actuating groove 304 is formed between the first cam 302 and the second cam 303. Wherein the bearing 320 extends into the actuation slot 304 and the outer race of the bearing 320 is in rolling engagement with the inner wall of the actuation slot 304.

Based on the above differences, the pressing component in this embodiment drives the pressing plate 4 to perform a reciprocating linear motion by the inner wall of the actuating groove 304 matching with the connecting shaft 32 and the bearing 320; meanwhile, the bearing 320 and the inner wall of the actuating groove 304 are in rolling fit, and the friction force between the bearing 320 and the inner wall is very small, so that the reciprocating stroke of the pressure plate 4 is not influenced.

Further, in this embodiment, the pressing plate 4 is also disposed below the mounting base 1, so the transmission member in this embodiment further includes a pushing plate 33, the connecting shaft 32 is disposed on the pushing plate 33, the pushing plate 33 and the pressing plate 4 are disposed at an interval from top to bottom, and the pushing plate 33 and the pressing plate 4 are fixedly connected by a bolt 40. The cam mechanism drives the push plate 33, and the push plate 33 drives the press plate 4 to reciprocate.

Example four: the present embodiment provides a reagent cartridge pressing device, as shown in fig. 8, the pressing device includes a base 7, a station 70 for placing a reagent cartridge is disposed on the base 7, and the reagent cartridge pressing assembly provided in the above embodiments is further disposed on the base 7. Wherein, mount pad 1 is set up on base 7 slidably, and the subassembly that also pushes down can slide relatively base 7 as a whole. The mount 1 includes a depressed position and a retracted position, and a state in which the mount 1 is located at the retracted position is shown in fig. 8. When mount pad 1 was located dodge the position, the subassembly that pushes down staggers each other with station 70 along the projection of vertical direction, also is in this dodge position, is convenient for place station 70 with the kit, pushes down the subassembly and can not produce the hindrance to placing the operation of kit. When the mounting base 1 is in the pressing position, the pressing plate is located right above the station 70, that is, in the pressing position, the pressing assembly is adapted to perform a pressing operation on the reagent cartridge located at the station 70.

Because this equipment of pushing down has adopted foretell subassembly of pushing down, can control the reciprocating motion stroke of clamp plate 4 accurately, and then ensure that clamp plate 4 pushes down the kit in place and can not excessively push down.

Example five: the present embodiment provides a pressing device for reagent kit, which is different from the third embodiment in that the push plate 33 and the press plate 4 are connected in a different manner, specifically, the push plate 33 and the press plate 4 are movably connected in the present embodiment, and an elastic member (e.g., a spring) for adjusting the distance between the push plate 33 and the press plate 4 is disposed between the push plate 33 and the press plate 4, and the elastic member applies force to the push plate 33 and the press plate 4 with a tendency that the push plate 33 and the press plate 4 are relatively far away from each other. When the cam mechanism drives the push plate 33, the push plate 33 can apply a force to the press plate 4 via the elastic member to drive the press plate 4 to reciprocate.

In the present invention, unless otherwise explicitly specified or limited in relation to the embodiments, the terms "mounted," "connected," and "fixed" appearing in the embodiments are to be understood broadly, for example, the connection may be a fixed connection, a detachable connection, or an integral body, and may be understood as a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific implementation.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A pressing component for a kit comprises a mounting seat (1), a driving mechanism (2) and a pressing plate (4), wherein the driving mechanism (2) is arranged on the mounting seat (1), and the pressing plate (4) is driven by the driving mechanism (2) to press down the kit, and is characterized in that a cam mechanism (3) is arranged between the driving mechanism (2) and the pressing plate (4), the cam mechanism (3) comprises an eccentric cam (30) and a transmission piece, the eccentric cam (30) is arranged on the driving mechanism (2), and the eccentric cam (30) is driven to do eccentric rotation motion around a set axis;

one end of the transmission piece is arranged on the pressing plate (4), the other end of the transmission piece is arranged on the eccentric cam (30), the transmission piece is driven by the eccentric cam (30) to drive the pressing plate (4) to do reciprocating linear motion along the vertical direction, and the pressing plate (4) presses down the reagent kit in the descending process.

2. The downward pressing component for reagent kit according to claim 1, wherein the transmission member is a rectangular frame (31), the eccentric cam (30) is in pressing contact with the upper section and the lower section of the rectangular frame (31) in the process of eccentric rotation, and the rectangular frame (31) is fixedly connected with the pressing plate (4).

3. The push-down assembly for reagent cartridges as claimed in claim 2, wherein the eccentric cam (30) comprises an eccentric block (300) and a rolling section (301) rotatably disposed on the eccentric block (300), the rolling section (301) protrudes into the rectangular frame (31), and the rolling section (301) is in rolling press-contact with the upper and lower sections of the rectangular frame (31) during the eccentric rotational movement.

4. The reagent kit of claim 3, wherein the eccentric block (300) is provided with a mounting shaft, the rolling section (301) is a bearing, and an inner ring of the bearing is arranged in an interference fit with the mounting shaft.

5. The push-down assembly for a reagent cartridge according to claim 1, wherein the transmission member comprises a connecting shaft (32), one end of the connecting shaft (32) is disposed on the pressure plate (4), and the other end of the connecting shaft (32) is provided with a bearing (320);

the eccentric cam (30) comprises a first cam (302), the first cam (302) is provided with a groove, a second cam (303) is arranged in the groove, an actuating groove (304) is formed between the first cam (302) and the second cam (303), the bearing (320) extends into the actuating groove (304), and the outer ring of the bearing (320) is in rolling fit with the inner wall of the actuating groove (304).

6. The push-down assembly for reagent cartridges according to claim 5, wherein the transmission member further comprises a push plate (33), one end of the connecting shaft (32) is provided with the push plate (33), the push plate (33) is disposed on the pressure plate (4), and an elastic member for adjusting the distance between the push plate (33) and the pressure plate (4) is disposed between the push plate (33) and the pressure plate (4), the elastic member applies force to the push plate (33) and the pressure plate (4) so that the push plate (33) and the pressure plate (4) have a tendency to move away from each other.

7. The reagent kit push-down assembly according to claim 5, wherein the transmission member further comprises a push plate (33), the connection shaft (32) is disposed on the push plate (33), the push plate (33) and the pressure plate (4) are spaced up and down, and the push plate (33) and the pressure plate (4) are fixedly connected through a bolt (40).

8. The hold-down assembly for reagent cartridges according to any one of claims 1 to 7, wherein a guide post (11) for limiting the moving direction of the hold-down plate (4) is provided between the hold-down plate (4) and the mounting base (1).

9. The hold-down assembly for reagent cartridges according to any of claims 1 to 7, wherein the pressure plate (4) is arranged below the mounting base (1), the mounting base (1) being provided with a through-hole (10) for the transmission member to pass through.

10. The downward pressing component for the reagent kit according to any one of claims 1 to 7, wherein a stroke detection component (5) is arranged on the mounting seat (1), the stroke detection component (5) comprises two groups of optoelectronic couplers (50) which are arranged at intervals up and down along a vertical direction, and each group of optoelectronic couplers (50) comprises a light emitting source and a light receiving device;

the light barrier (6) is arranged on the transmission piece and performs reciprocating linear motion along with the transmission piece, and the light barrier (6) is respectively provided with a first position and a second position at two ends of a stroke of the reciprocating linear motion;

when the light barrier (6) is located at the first position, the light barrier (6) extends into a position between the light emitting source and the light receiver which are located above;

when the light barrier (6) is located at the second position, the light barrier (6) extends into a position between the light emitting source and the light receiving device which are located below.

11. A reagent cartridge hold-down apparatus comprising a base (7), a station (70) for placing the reagent cartridge being provided on the base (7), characterized in that the base (7) is further provided with a reagent cartridge hold-down assembly according to any one of claims 1 to 10;

the mounting seat (1) is slidably arranged on the base (7), the mounting seat (1) comprises a pressing position and an avoiding position, when the mounting seat (1) slides to the pressing position, the pressing plate (4) is located right above the station (70), and when the mounting seat (1) slides to the avoiding position, the projection of the pressing component in the vertical direction and the station (70) are mutually staggered.