A sample adding needle mechanism

Abstract

The invention provides a sample adding needle mechanism, including a first mounting plate and a transmission component, a sliding component, a sampling component, and an air extraction component mounted on the first mounting plate, wherein the sampling component is mounted on the transmission component, the sliding component is slidably connected to the transmission component, and the air extraction component is connected to the sampling component through a pipeline; the sliding component includes a primary guide rail and a secondary guide rail, the primary guide rail is slidably connected with a primary slider corresponding to it, the secondary guide rail is fixed to the primary slider, the secondary guide rail is slidably connected with a secondary slider corresponding to it, a first elastic member is hinged between the same side of the sampling component and the primary slider, and a bottom detection optical coupler is installed on the primary block. The sample adding needle mechanism described in the invention can complete bottom detection, avoid unnecessary losses caused by the sample adding needle hitting the bottom of the vessel, and can detect whether the substitute head is in place.

Description

Technical Field

[0001] The invention belongs to the field of medical devices, and in particular relates to a sample adding needle mechanism. Background Art

[0002] With the development of medicine, automatic sample loading has gradually replaced manual sample loading. At present, many automatic sample loading devices have appeared in the domestic and foreign markets. Most of the existing automatic sample loading devices alarm and recover after collision. They are post-alarms and cannot be prevented in advance, which affects work efficiency and greatly wastes time costs. Therefore, there is an urgent need for a sample loading needle mechanism with a bottom detection function that can avoid collision. Invention content

[0003] In view of this, the present invention aims to overcome the defects in the above-mentioned prior art and proposes a sample adding needle mechanism.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A sample adding needle mechanism comprises a first mounting plate and a transmission component, a sliding component, a sampling component and an air extraction component mounted on the first mounting plate, wherein the sampling component is mounted on the transmission component, the sliding component is used to drive the transmission component to move, and the air extraction component is connected to the sampling component through a pipeline;

[0006] The sliding assembly includes a primary guide rail and a secondary guide rail, the primary guide rail is fixed on the first mounting plate, a primary slider corresponding to the primary guide rail is slidably connected to the primary guide rail, the secondary guide rail is fixed on the primary slider, a secondary slider corresponding to the primary guide rail is slidably connected to the secondary guide rail, the secondary slider is fixedly connected to the sampling assembly, a first elastic member is hinged between the same side of the sampling assembly and the primary slider, the primary slider is fixedly connected to the conveyor belt of the conveying assembly, a bottoming detection optical coupler is installed on the primary stopper, and a U-shaped baffle corresponding to the bottoming detection optical coupler is fixed on the sampling assembly.

[0007] Furthermore, the transmission component includes a driving shaft, a driven shaft, and a driving motor. The output shaft of the driving motor is fixedly connected to the driving shaft. The driving motor is fixed to the upper part of the first mounting plate. The driven shaft is fixed to the lower part of the first mounting plate through a fixing block. The conveyor belt is arranged between the driving shaft and the driven shaft. A first mounting block is fixed to the primary slider. The first mounting block is fixedly connected to the sampling component. The first mounting block extends toward one end close to the transmission component to form a strip mounting block. The strip mounting block extends into the interior of the conveyor belt. A clamping plate is threadedly connected to the strip mounting plate. The belt surface of the conveyor belt is arranged between the clamping plate and the strip mounting plate. The conveyor belt is fixedly connected to the first mounting block by tightening bolts. The driving motor is connected to an embedded circuit control device. The embedded circuit control device is a limited technology and will not be described here.

[0008] Furthermore, the sampling assembly includes a sampling tube and a substitute head. The upper part of the sampling tube is fixed to the secondary slider through a second mounting block. The secondary slider is provided with a slide groove corresponding to the secondary guide rail. The top end of the sampling tube is connected to the vacuum assembly through a pipeline, and the bottom end is connected to the substitute head.

[0009] Furthermore, the sampling tube is located at the bottom of the mounting block and is sequentially sleeved with a second elastic member and a sleeve, the top of the second elastic member is fixedly connected to the second mounting block, and the bottom is fixedly connected to the sleeve, the sleeve is slidably connected to the sampling tube, the bottom of the sleeve extends downward to form an arc-shaped top plate, the arc-shaped top plate is arranged on the upper part of the substitute head, a Z-shaped baffle is fixed on one side of the sleeve close to the first mounting plate, an installation detection optical coupler corresponding to the Z-shaped baffle is fixed on the first mounting plate, and the driving motor is connected to an embedded circuit control device of the sample adding needle mechanism.

[0010] Furthermore, a detection module for detecting liquid level is also installed on the second mounting block, the bottom end of the sampling tube is connected to a metal joint through an insulating tube, the metal joint is connected to the substitute head at one end away from the sampling tube, the detection module is connected to the metal joint through a single wire, and a metal connecting line for detecting capacitance is also connected between the detection module and the metal joint. Furthermore, a first reset optical coupler corresponding to the first mounting block is fixed to the upper part of the first mounting plate, and a strip baffle corresponding to the first reset optical coupler is fixed to one side of the strip mounting block close to the first mounting plate, and the first reset optical coupler is electrically connected to the embedded circuit control device.

[0011] Furthermore, a safety optocoupler corresponding to the first mounting block is fixed to the lower portion of the first mounting plate, the safety optocoupler is arranged in coordination with the strip baffle, and the safety optocoupler is electrically connected to the embedded circuit control device.

[0012] Furthermore, one end of the U-shaped baffle is fixed to the side of the top second mounting block close to the conveying component through a fixing plate, and the other end is bent around the conveyor belt to cooperate with the bottoming detection optocoupler, and the bottoming detection optocoupler is electrically connected to the embedded circuit control device.

[0013] Furthermore, a side panel is also installed on the first mounting plate, and the air extraction component is installed on the side panel. The air extraction component includes a stepping motor, a three-stage slide rail, and a syringe. The output shaft of the stepping motor is fixedly connected to a screw, and the end of the screw away from the stepping motor is rotatably connected to the second mounting plate through a nut seat, and the second mounting plate extends downward on a side close to the side panel to form a fixed plate, and a three-stage slider is fixed on a side of the fixed plate close to the side panel, and the three-stage guide rail is fixed to the side panel and arranged parallel to the screw, and the three-stage slider is slidably connected to the three-stage guide rail through its reserved slide groove, and the syringe is fixed to the bottom of the side panel through a third mounting block, and the top of the air extraction rod of the syringe is fixedly connected to the second mounting plate through a connecting rod, and the air extraction joint of the syringe is connected to the sampling tube through a pipeline, and the stepping motor is electrically connected to the embedded circuit control device.

[0014] Furthermore, a second reset optocoupler is installed on the third mounting block, a Z-shaped baffle is fixed to the side of the fixed plate away from the three-stage slider, the Z-shaped baffle is arranged in coordination with the second reset optocoupler, and the second reset optocoupler is electrically connected to the embedded circuit control device.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The sliding assembly uses a primary guide rail and a secondary guide rail to transport the sampling assembly. The bottoming detection optical coupler detects the displacement between the primary slider and the sliding assembly to determine whether the sampling assembly has bottomed out, which makes the determination safer and more accurate.

[0017] (2) A stepper motor is used to drive the syringe to pump air, and the amount of liquid aspirated can be accurately controlled by controlling the number of steps of the stepper motor;

[0018] (3) The safety optical coupler can detect the position of the sampling component in time when the sampling component is not equipped with a substitute head and the bottoming detection is not effective, so that the transmission component can stop running in time to avoid the transmission component from slipping due to the failure of the bottoming detection to stop running;

[0019] (4) Installation inspection The optocoupler can accurately determine whether the substitute head is installed on the metal connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of a sample adding needle mechanism according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a transmission component and a sampling component according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a sampling assembly according to an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a sampling assembly according to an embodiment of the present invention;

[0025] Figure 5 The present invention is intended to create an exhaust assembly as described in an embodiment.

[0026] Description of reference numerals:

[0027] 1-transmission assembly; 11-driving motor; 12-driving shaft; 13-driven shaft; 14-conveyor belt; 15-fixed block; 2-sliding assembly; 21-primary guide rail; 22-first mounting block; 221-strip baffle; 222-clamping plate; 223-strip mounting block; 23-secondary guide rail; 231-secondary slider; 24-U-shaped baffle; 241-fixed sheet; 25-bottoming detection optical coupler; 26-slideway; 27-first reset optical coupler; 28-safety optical coupler; 3-sampling assembly; 31-sampling tube; 311-second mounting block; 32-second elastic member; 312-metal joint; 313-insulating tube; 33-sleeve; 331-arc top plate; 34-substitute head; 35-Z-shaped baffle; 36-installation inspection optical coupler; 37-first elastic member; 38-detection module; 371-hinge shaft; 4-vacuum assembly; 41-stepping motor; 411-screw rod; 412-nut seat; 413-second mounting plate; 414-fixed plate; 42-three-stage slide rail; 421-three-stage slider; 44-second reset optical coupler; 45-syringe; 451-connecting rod; 452-vacuum rod; 453-vacuum joint; 454-third mounting block; 5-first mounting plate; 51-side panel. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] like Figure 1 , Figure 2 As shown, a sample adding needle mechanism comprises a first mounting plate 5 and a conveying assembly 1, a sliding assembly 2, a sampling assembly 3, and an air extraction assembly 4 mounted on the first mounting plate 5, wherein the sampling assembly 3 is mounted on the conveying assembly 1, the sliding assembly 2 is used to drive the conveying assembly 1 to move, and the air extraction assembly 4 is connected to the sampling assembly 3 through a pipeline;

[0033] The sliding assembly 2 includes a primary guide rail 21 and a secondary guide rail 23. The primary guide rail 21 is fixed on the first mounting plate 5. A primary slider corresponding to the primary guide rail 21 is slidably connected. The secondary guide rail 23 is fixed on the primary slider. A secondary slider 231 corresponding to the primary guide rail 23 is slidably connected. The secondary slider 231 is fixedly connected to the sampling assembly 3. A first elastic member 37 is hinged between the same side of the sampling assembly 3 and the primary slider through a hinge. The primary slider is fixedly connected to the conveyor belt 14 of the conveying assembly 1. A bottom detection optical coupler 25 is installed on the primary stopper. A U-shaped baffle 24 corresponding to the bottom detection optical coupler 25 is fixed on the sampling assembly 3. In the initial state, the U-shaped baffle 24 is located on the upper part of the bottoming detection optical coupler 25. When sampling is performed, the transmission component 1 drives the primary slider to slide downward, and the primary slider passes through and the elastic member pulls the sampling component 3 to slide downward. At this time, the U-shaped baffle 24 and the bottoming detection optical coupler 25 are relatively stationary. When the substitute head 34 touches the bottom, the secondary slider 231 is no longer moving due to the fixed connection with the sampling component 3. The conveyor belt 14 drives the primary slider to continue to move downward, and the primary elastic member is stretched, and a relative displacement is generated between the primary slider and the secondary slider 231, thereby driving the U-shaped baffle 24 to block the bottoming detection optical coupler 25. The optical coupler transmits a signal to the embedded circuit control device, and the embedded circuit control device controls the drive motor 11 to stop running, thereby stopping the movement of the primary slider.

[0034] like Figure 1 , Figure 2 As shown, the transmission component 1 includes a driving shaft 12, a driven shaft 13, and a driving motor 11. The output shaft of the driving motor 11 is fixedly connected to the driving shaft 12 through a coupling. The driving motor 11 is fixed to the upper part of the first mounting plate 5, and the driven shaft 13 is fixed to the lower part of the first mounting plate 5 through a fixing block 15. The conveyor belt 14 is arranged between the driving shaft 12 and the driven shaft 13. A first mounting block 22 is fixed on the primary slider, and the first mounting block 22 is fixedly connected to the sampling component 3. The first mounting block 22 extends toward one end close to the transmission component 1 to form a strip mounting block 223, and the strip mounting block 223 extends into the interior of the conveyor belt 14. A clamping plate 222 is threadedly connected to the strip mounting plate. The belt surface of the conveyor belt 14 is arranged between the clamping plate 222 and the strip mounting plate, and is fixedly connected to the first mounting block 22 by tightening bolts. The driving motor 11 is connected to the embedded circuit control device of the sample adding needle mechanism.

[0035] The embedded circuit control device is mainly used for receiving signals from various optocouplers and detection modules, and controlling drive motors and servo motors. The embedded circuit control device can use self-developed equipment or existing PLC to achieve the above functions.

[0036] like Figure 3 , Figure 4 As shown, the sampling assembly 3 includes a sampling tube 31 and a substitute head 34. The upper part of the sampling tube 31 is fixed to the secondary slider 231 through a second mounting block 311. The secondary slider 231 is provided with a slide groove 26 corresponding to the secondary guide rail 23. The top of the sampling tube 31 is connected to the air extraction assembly 4 through a pipeline, and the bottom is connected to the substitute head 34. The substitute head 34 is used to absorb the liquid placed in the container and store the liquid at the same time. After each absorption, the next substitute head 34 is replaced to absorb the liquid again.

[0037] like Figure 3 , Figure 4 As shown, the sampling tube 31 is located at the bottom of the mounting block and is sequentially sleeved with a second elastic member 32 and a sleeve 33. The top of the second elastic member 32 is fixedly connected to the second mounting block 311, and the bottom is fixedly connected to the sleeve 33. The sleeve 33 is slidably connected to the sampling tube 31. The bottom of the sleeve 33 extends downward to form an arc-shaped top plate 331. The arc-shaped top plate 331 is arranged on the upper part of the substitute head 34. A Z-shaped baffle 35 is fixed on one side of the sleeve 33 close to the first mounting plate 5. An installation detection optocoupler corresponding to the Z-shaped baffle 35 is fixed on the first mounting plate 5. The installation detection optocoupler is electrically connected to the embedded circuit control device. The installation detection optical coupler is used to detect whether the substitute head 34 is sleeved on the sampling tube 31. When replacing the substitute head 34, the sampling tube 31 moves downward under the drive of the transmission component 1, and the bottom end extends into the through opening at the top of the substitute head 34. Since the outer diameter of the substitute head 34 is greater than or equal to the outer diameter of the arc-shaped top plate 331, the substitute head 34 pushes the arc-shaped top plate 331 upward, thereby driving the sleeve 33 to move upward, and the Z-shaped baffle 35 moves upward accordingly, and the second elastic member 32 is compressed. When the sampling component 3 is reset, the Z-shaped baffle 35 blocks the installation detection optical coupler, and the installation detection optical coupler transmits the signal to the embedded circuit control device, thereby knowing that the substitute head 34 has been installed on the sampling tube 31.

[0038] like Figure 3 , Figure 4As shown, a detection module 38 for detecting the liquid level is also installed on the second mounting block 311. The bottom end of the sampling tube 31 is connected to a metal joint 312 through an insulating tube 313. The metal joint 312 is connected to the substitute head 34 at one end away from the sampling tube 31. The detection module 38 is connected to the metal joint 312 through a single wire. A metal connecting wire for detecting the capacitance is also connected between the detection module 38 and the metal joint 312. The detection module 38 transmits charge to the metal joint 312 through the wire. When the metal joint 312 extends into the liquid surface, the metal head, the substitute head 34, and the liquid form a conductive loop. The detection module 38 detects the change in the charge in the metal joint 312 through the metal connecting wire, thereby judging that the substitute head 34 has contacted the liquid surface. If the liquid in the test tube is layered, different samples need to be sucked, and the depth of the substitute head 34 entering the embassy is also determined by detection. The detection module 38 is electrically connected to the embedded circuit control device, and adopts but is not limited to the Wanchen WTLLS-485B detection module 38.

[0039] like Figure 3 , Figure 4 As shown, a first reset optical coupler 27 corresponding to the first mounting block 22 is fixed on the upper part of the first mounting plate 5, and a strip baffle 221 corresponding to the first reset optical coupler 27 is fixed on the side of the strip mounting block 223 close to the first mounting plate 5, and the first reset optical coupler 27 is electrically connected to the embedded circuit control device. The first reset optical coupler 27 is used to ensure that the sampling component 3 returns to the initial position after completing a sampling, and the conveyor belt 14 drives the sampling component 3 to move upward. When the strip baffle 221 blocks the first reset optical coupler 27, the first reset optical coupler 27 sends a signal to the embedded circuit control device, and the embedded circuit control device controls the drive motor 11 to stop working, thereby stopping the sampling component 3 from moving.

[0040] like Figure 2 As shown, a safety optical coupler 28 corresponding to the first mounting block 22 is fixed to the lower part of the first mounting plate 5, and the safety optical coupler 28 is arranged in cooperation with the strip baffle 221, and the safety optical coupler 28 is electrically connected to the embedded circuit control device. When there is no substitute head 34 on the sampling tube 31, the conveyor belt 14 drives the sampling component 3 to move downward, and the bottom detection cannot work. At this time, when the strip baffle 221 moves downward to block the safety optical coupler 28, the safety optical coupler 28 sends a signal to the embedded circuit control device, and the embedded circuit control device controls the drive motor 11 to stop working, thereby stopping the sampling component 3 from moving.

[0041] like Figure 2As shown, one end of the U-shaped baffle 24 is fixed to the side of the top second mounting block 311 close to the conveying component 1 through a fixing plate 241, and the other end is bent around the conveyor belt 14 to cooperate with the bottom detection optocoupler 25, and the bottom detection optocoupler 25 is electrically connected to the embedded circuit control device.

[0042] like Figure 5 As shown, a side plate 51 is also installed on the first mounting plate 5, and the air extraction component 4 is installed on the side plate 51. The air extraction component 4 includes a stepping motor 41, a three-stage slide rail 42, and a syringe 45. The output shaft of the stepping motor 41 is fixedly connected with a screw 411. The end of the screw 411 away from the stepping motor 41 is rotatably connected to a second mounting plate 413 through a nut seat 412. The second mounting plate extends downwardly from a side close to the side plate 51 to form a fixed plate 414. The fixed plate 414 is fixed to a side close to the side plate 51. There is a three-stage slider 421, the three-stage guide rail is fixed on the side plate 51, and is arranged parallel to the screw 411. The three-stage slider 421 is slidably connected to the three-stage guide rail. The syringe 45 is fixed to the bottom of the side plate 51 through the third mounting block 454. The top of the suction rod 452 of the syringe 45 is fixedly connected to the second mounting plate 413 through the connecting rod 451. The suction connector 453 of the syringe 45 is connected to the sampling tube 31 through a pipeline. The stepper motor 41 is electrically connected to the embedded circuit control device. The stepper motor 41 drives the second mounting plate to move upward along the three-stage guide rail by rotating the screw 411, thereby driving the suction rod 452 of the syringe 45 to move to complete the suction, so that suction is generated inside the substitute head 34 through the pipeline, and then the liquid is sucked. The embedded circuit control device controls the amount of liquid sucked by controlling the number of steps of the stepper motor 41.

[0043] like Figure 5 As shown, a second reset optical coupler 44 is also installed on the third mounting block 454, and a Z-shaped baffle 35 is fixed on the side of the fixed plate 414 away from the three-stage slider 421. The Z-shaped baffle 35 is arranged in cooperation with the second reset optical coupler 44, and the second reset optical coupler 44 is electrically connected to the embedded circuit control device. The second reset optical coupler 44 is used to confirm whether the suction rod 452 of the syringe 45 has reached the initial position. When the suction component 4 completes a suction, the three-stage slider 421 moves downward under the drive of the stepper motor 41, thereby driving the suction rod 452 of the syringe 45 and the Z-shaped baffle 35 to move downward. When the Z-shaped baffle 35 blocks the second reset optical coupler 44, the second reset optical coupler 44 sends a signal to the embedded circuit control device, and the embedded circuit control device controls the stepper motor 41 to stop working, thereby stopping the suction rod 452 of the syringe 45 from moving.

[0044] When sampling, the transmission component 1 drives the sampling component 3 to move downward, and the transmission component 1 drives the primary slider to slide downward. The primary slider passes through and the elastic member pulls the sampling component 3 to slide downward. At this time, the U-shaped baffle 24 and the bottoming detection optical coupler 25 are relatively stationary. When the substitute head 34 touches the bottom, the secondary slider 231 is fixedly connected to the sampling component 3 and no longer moves. The conveyor belt 14 drives the primary slider to continue to move downward, and the primary elastic member is stretched. A relative displacement is generated between the primary slider and the secondary slider 231, thereby driving the U-shaped baffle 24 to block the bottoming detection optical coupler 25. The optical coupler transmits a signal to the embedded circuit control device. The embedded circuit The control device controls the driving motor 11 to stop running so that the first-stage slider stops moving. At the same time, the embedded circuit control device controls the stepper motor 41 according to the pre-set number of steps to drive the air extraction rod 452 to move upward by a set distance to extract air. After the liquid is sucked into the substitute head 34, the substitute head 34 is removed, and the sampling component 3 moves downward so that the new substitute head 34 is sleeved on the metal joint 312. At this time, the sleeve is pushed up and drives the Z-shaped baffle 35 to move upward to cover the installation inspection optical coupler 36, so as to know that the new substitute head 34 is sleeved. The transmission component 1 drives the sampling component 3 to move upward, and the strip baffle 221 stops moving when it blocks the first reset optical coupler 27 to complete the reset. At this time, the embedded circuit control device controls the stepper motor 41 to rotate in the opposite direction to drive the Z-shaped baffle 35 to move downward. When the Z-shaped baffle 35 blocks the second reset optical coupler 44, the air extraction rod 452 living thereon completes the reset, and the stepper motor 41 notifies the work.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sample adding needle mechanism, characterized in that: The invention comprises a first mounting plate (5), a conveying assembly (1), a sliding assembly (2), a sampling assembly (3), and an air extraction assembly (4) mounted on the first mounting plate (5), wherein the sampling assembly (3) is mounted on the conveying assembly (1), the sliding assembly (2) is used to drive the conveying assembly (1) to move, and the air extraction assembly (4) is connected to the sampling assembly (3) through a pipeline; The sliding assembly (2) comprises a primary guide rail (21) and a secondary guide rail (23); the primary guide rail (21) is fixed on the first mounting plate (5); a primary slider corresponding to the primary guide rail (21) is slidably connected to the primary guide rail (21); the secondary guide rail (23) is fixed on the primary slider; a secondary slider corresponding to the primary guide rail (23) is slidably connected to the secondary guide rail (23); the secondary slider (231) is fixedly connected to the sampling assembly (3); a first elastic member (37) is hinged between the same side of the sampling assembly (3) and the primary slider; the primary slider is fixedly connected to the conveyor belt (14) of the conveying assembly (1); a bottom detection optical coupler (25) is installed on the primary slider; and a U-shaped baffle (24) corresponding to the bottom detection optical coupler (25) is fixed on the sampling assembly (3); The sampling assembly (3) comprises a sampling tube (31) and a substitute head (34); the upper portion of the sampling tube (31) is fixed to the secondary slider (231) via a second mounting block (311); the secondary slider (231) is provided with a slide groove (26) corresponding to the secondary guide rail (23); the top end of the sampling tube (31) is connected to the air extraction assembly (4) via a pipeline, and the bottom end is connected to the substitute head (34); The sampling tube (31) is located at the bottom of the mounting block and is sequentially sleeved with a second elastic member (32) and a sleeve (33); the top of the second elastic member (32) is fixedly connected to the second mounting block (311), and the bottom is fixedly connected to the sleeve (33); the sleeve (33) is slidably connected to the sampling tube (31); the bottom of the sleeve (33) extends downward to form an arc-shaped top sheet (331); the arc-shaped top sheet (331) is arranged on the upper part of the substitute head (34); a Z-shaped baffle (35) is fixed on one side of the sleeve (33) close to the first mounting plate (5); an installation detection optical coupler corresponding to the Z-shaped baffle (35) is fixed on the first mounting plate (5); the installation detection optical coupler is electrically connected to the embedded circuit control device; A detection module (38) for detecting the liquid level is also installed on the second mounting block (311); the bottom end of the sampling tube (31) is connected to a metal joint (312) via an insulating tube (313); the end of the metal joint (312) away from the sampling tube (31) is connected to the substitute head (34); the detection module (38) is connected to the metal joint (312) via a single-phase wire; a metal connecting wire for detecting capacitance is also connected between the detection module (38) and the metal joint (312).

2. A sample adding needle mechanism according to claim 1, characterized in that: The transmission assembly (1) comprises a driving shaft (12), a driven shaft (13), and a driving motor (11); the output shaft of the driving motor (11) is fixedly connected to the driving shaft (12) via a coupling; the driving motor (11) is fixed to the upper part of the first mounting plate (5); the driven shaft (13) is fixed to the lower part of the first mounting plate (5) via a fixing block (15); the conveyor belt (14) is arranged between the driving shaft (12) and the driven shaft (13); a first mounting block (22) is fixed on the primary slider; the first mounting block (22) The first mounting block (22) is fixedly connected to the sampling component (3), and the first mounting block (22) extends toward one end close to the conveying component (1) to form a strip mounting block (223). The strip mounting block (223) extends into the interior of the conveyor belt (14). A clamping plate (222) is threadedly connected to the strip mounting block (223). The belt surface of the conveyor belt (14) is arranged between the clamping plate (222) and the strip mounting plate, and is fixedly connected to the first mounting block (22) by tightening bolts. The driving motor (11) is connected to an embedded circuit control device of a sample adding needle mechanism.

3. A sample adding needle mechanism according to claim 2, characterized in that: A first reset optical coupler (27) corresponding to the first mounting block (22) is fixed on the upper part of the first mounting plate (5); a strip-shaped baffle (221) corresponding to the first reset optical coupler (27) is fixed on one side of the strip-shaped mounting block (223) close to the first mounting plate (5); and the first reset optical coupler (27) is electrically connected to the embedded circuit control device.

4. A sample adding needle mechanism according to claim 3, characterized in that: A safety optocoupler (28) corresponding to the first mounting block (22) is fixed to the lower part of the first mounting plate (5); the safety optocoupler (28) is arranged in coordination with the strip baffle (221); and the safety optocoupler (28) is electrically connected to an embedded circuit control device.

5. The sample adding needle mechanism according to claim 1, characterized in that: One end of the U-shaped baffle (24) is fixed to a side of the second mounting block (311) at the top end close to the transmission component (1) through a fixing plate (241), and the other end is bent around the conveyor belt (14) to cooperate with the bottom detection optical coupler (25), and the bottom detection optical coupler (25) is electrically connected to the embedded circuit control device.

6. A sample adding needle mechanism according to claim 1, characterized in that: A side plate (51) is also mounted on the first mounting plate (5), and the air extraction assembly (4) is mounted on the side plate (51). The air extraction assembly (4) comprises a stepping motor (41), a three-stage slide rail (42), and a syringe (45). The output shaft of the stepping motor (41) is fixedly connected with a screw rod (411), and one end of the screw rod (411) away from the stepping motor (41) is rotatably connected with a second mounting plate (413) through a nut seat (412). The second mounting plate (413) extends downwardly from a side close to the side plate (51) to form a fixed plate (414), and a three-stage slide rail (42) is fixed to a side of the fixed plate (414) close to the side plate (51). The third mounting block (421) is fixed on the side plate (51) and is arranged parallel to the screw rod (411). The third sliding block (421) is slidably connected to the third sliding rail (42) through its reserved sliding groove (26). The syringe (45) is fixed to the bottom of the side plate (51) through a third mounting block (454). The top of the suction rod (452) of the syringe (45) is fixedly connected to the second mounting plate (413) through a connecting rod (451). The suction connector (453) of the syringe (45) is connected to the sampling tube (31) through a pipeline. The stepping motor (41) is electrically connected to the embedded circuit control device.

7. A sample adding needle mechanism according to claim 6, characterized in that: A second reset optical coupler (44) is also mounted on the third mounting block (454); a Z-shaped baffle (35) is fixed to a side of the fixed plate (414) away from the third-level slider (421); the Z-shaped baffle (35) is arranged in coordination with the second reset optical coupler (44); and the second reset optical coupler (44) is electrically connected to the embedded circuit control device.

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