Sampling assembly of biochemical analyzer

Abstract

The utility model discloses a sampling assembly of a biochemical analyzer, and relates to the field of biochemical analyzers, the sampling assembly comprises a bottom plate movably mounted at the bottom of a shell, a sampling needle is fixedly mounted at one end of the bottom of the bottom plate, a distance sensor fixedly sleeves the surface of the sampling needle, and a connecting plate is slidably mounted in the center of the bottom plate; a first arc-shaped protection plate and a second arc-shaped protection plate are fixedly mounted on the left side and the right side of the bottom of the connecting plate correspondingly, and a sliding assembly used for driving the connecting plate to slide at the bottom of the bottom plate is fixedly arranged on the side, away from the connecting plate, of the bottom plate. The sliding assembly comprises a first lead screw which is rotationally installed between the two first installation plates and drives the first sliding block to slide in the first sliding groove, and a clamping assembly is fixedly arranged at the bottom of the connecting plate. According to the device, the arc-shaped protection plate I and the arc-shaped protection plate II are combined together, so that the sampling needle is isolated between the arc-shaped protection plate I and the arc-shaped protection plate II, and the sampling needle is prevented from being bent or broken.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of biochemical analyzers, in particular to a sampling assembly of a biochemical analyzer. BACKGROUND

[0002] Biochemical analyzers are one of the important instruments frequently used in clinical examination. Biochemical analyzers measure biochemical indicators such as transaminase, hemoglobinase, and cholesterol by analyzing blood or other body fluids. The sampling needle is an elongated metal needle and is one of the important components of the biochemical analyzer.

[0003] As disclosed in the patent with the authorized announcement number CN219914957U, a biochemical analyzer sampling needle protection device is provided, but the following problems still exist in actual use:

[0004] When the height of the collision object does not reach the height of the connecting arm, the collision object will directly collide with the sampling needle. When the sensor detects that the code disc is not rotating normally, the sampling needle has collided with the collision object. When the control system controls the driving system to stop rotating, the sampling needle may have been bent or broken. UTILITY MODEL CONTENT

[0005] In order to improve the problem that when the height of the collision object does not reach the height of the connecting arm, the collision object will directly collide with the sampling needle, and the sampling needle may have been bent or broken, the present application provides a sampling assembly of a biochemical analyzer.

[0006] The sampling assembly of the biochemical analyzer provided by the present application adopts the following technical solution:

[0007] The sampling assembly of the biochemical analyzer comprises a bottom plate movably installed at the bottom of a shell, a sampling needle fixedly installed at one end of the bottom of the bottom plate, a distance sensor fixedly sleeved on the surface of the sampling needle, a connecting plate slidably installed at the center of the bottom plate, arc-shaped protection plates one and two fixedly installed at the left and right sides of the bottom of the connecting plate, respectively, a sliding assembly for driving the connecting plate to slide at the bottom of the bottom plate fixedly arranged at the side of the bottom plate away from the connecting plate, the sliding assembly comprising a lead screw one rotatably installed between two installation plates one for driving a sliding block one to slide in a sliding groove one, a clamping assembly fixedly arranged at the bottom of the connecting plate, and a rack slidably installed at the bottom of an installation plate two for driving a gear to rotate.

[0008] When the distance between the collision object and the distance sensor is less than 10 cm, the distance sensor detects the distance and transmits a signal to the single-chip microcomputer, the single-chip microcomputer compares the distance with a preset threshold (for example, 10 cm), controls the motor to rotate, and then the sliding assembly drives the connecting plate to slide along the sliding groove I, so that the arc-shaped protective plate I and the arc-shaped protective plate II slide to positions corresponding to the sampling needle, after that, the electric push rod is started, the clamping assembly drives the arc-shaped protective plate I and the arc-shaped protective plate II to slide relative to each other, so that the arc-shaped protective plate I and the arc-shaped protective plate II are combined together, and then the sampling needle is isolated in the arc-shaped protective plate I and the arc-shaped protective plate II, so as to avoid the collision of the sampling needle and the bending of the sampling needle.

[0009] Preferably, the two installation plates I are fixedly installed on the top of the bottom plate and arranged symmetrically left and right, a sliding rod is rotatably installed between the two installation plates I through a rotating shaft I, the sliding rod is symmetrically arranged with the lead screw I, a sliding block II is slidably sleeved on the sliding rod, the sliding block I is threadedly sleeved on the surface of the lead screw I, and the bottom ends of the sliding block I and the sliding block II are movably penetrated through the side wall of the bottom plate and fixedly installed on the top of the connecting plate.

[0010] By adopting the above technical scheme, the sliding rod and the lead screw I are arranged, and the sliding block II is slidably sleeved on the sliding rod. The sliding block I is threadedly sleeved on the lead screw I, and the sliding block II and the sliding block I are symmetrically arranged on the same horizontal line, which can ensure the synchronization of the connecting plate during sliding, avoid deflection or jamming, and improve the stability and accuracy of transmission.

[0011] Preferably, the two sliding grooves I are provided and are formed through the bottom of the bottom plate, the sliding block I and the sliding block II are respectively located in the corresponding sliding groove I and realize horizontal sliding, one side of the installation plate I is fixedly provided with a motor I, and the output end of the motor I penetrates the side wall of the installation plate I and is fixedly arranged on one end of the lead screw I.

[0012] By adopting the above technical scheme, the motor I drives the lead screw I to rotate, and the sliding block I threadedly sleeved on the lead screw I slides in the sliding groove I.

[0013] Preferably, the arc-shaped protective plate I and the arc-shaped protective plate II are fixedly connected with sliding plates on the outside, the bottom of the connecting plate is symmetrically fixedly connected with installation plates III on the left and right sides, the two installation plates III are rotatably connected with a lead screw II through a rotating shaft II, and the two sliding plates are symmetrically threadedly sleeved on the two ends of the surface of the lead screw II.

[0014] By adopting the above technical scheme, the rotation of the lead screw II drives the two sliding plates symmetrically threadedly sleeved on the two ends of the surface of the lead screw II to slide towards each other, and then drives the arc-shaped protective plate I and the arc-shaped protective plate II to slide relative to each other, so that the arc-shaped protective plate I and the arc-shaped protective plate II are combined together, and then the sampling needle is isolated in the arc-shaped protective plate I and the arc-shaped protective plate II, so as to avoid the collision of the sampling needle and the bending of the sampling needle.

[0015] Preferably, the screw rod two is provided with thread groove one and thread groove two with opposite rotation direction at both ends of the two surfaces respectively.

[0016] By adopting the above technical scheme, through the rotation of the screw rod two, the two thread grooves with opposite rotation direction can drive the two sliding plates to slide synchronously.

[0017] Preferably, the mounting plate two is fixedly installed on one side of the bottom of the connecting plate, the rack is provided with a sliding block three at the top, the mounting plate two is provided with a sliding groove two at the bottom, the sliding block three is located in the sliding groove two and realizes horizontal sliding, the mounting plate two is provided with an electric push rod at the top, and the output shaft of the electric push rod is fixedly connected to one end of the rack.

[0018] By adopting the above technical scheme, the cooperation of the sliding block three and the sliding groove two makes the rack more stable during movement, reduces the friction resistance, and thus improves the transmission efficiency.

[0019] Preferably, the outer end of the rotating shaft two 811 is provided with a gear 87 engaged with the rack 88.

[0020] By adopting the above technical scheme, the electric push rod drives the rack to slide, the gear is engaged with the rack to directly convert linear motion into rotary motion, drives the gear to rotate, and simplifies the design and implementation process of the transmission mechanism.

[0021] Preferably, the connecting plate is provided with a U-shaped groove matched with the shape of the sampling needle at the top.

[0022] By adopting the above technical scheme, when the connecting plate slides to the position of the sampling needle, the sampling needle slides into the U-shaped groove, and the center of the U-shaped groove coincides with the center of the sampling needle.

[0023] In summary, the present application has the following at least one beneficial technical effect:

[0024] 1. By setting the distance sensor, when the distance between the collision object and the distance sensor is less than 10 cm, the distance sensor detects the distance and transmits a signal to the single-chip microcomputer, the single-chip microcomputer compares the distance with the preset threshold value (such as 10 cm), controls the motor one to rotate, and then the sliding assembly drives the connecting plate to slide along the sliding groove one, so that the arc-shaped protective plate one and the arc-shaped protective plate two slide to the position corresponding to the sampling needle, then the electric push rod is started, the clamping assembly drives the arc-shaped protective plate one and the arc-shaped protective plate two to slide relative to each other, so that the arc-shaped protective plate one and the arc-shaped protective plate two are combined together, and then the sampling needle is isolated in the arc-shaped protective plate one and the arc-shaped protective plate two, avoiding the sampling needle being bent or broken. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0026] Figure 2 The overall structure of the present application;

[0027] Figure 3 The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0028] Figure 4 The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0029] Figure 5 The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0030] Figure 6 The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0031] Figure 7 The overall structure of the present application and the structure schematic diagram of the biochemical analyzer

[0032] Reference signs: 1, shell; 2, bottom plate; 3, sampling needle; 4, arc-shaped protective plate I; 5, arc-shaped protective plate II; 6, connecting plate;

[0033] 7, sliding assembly; 71, sliding block II; 72, rotating shaft I; 73, sliding rod; 74, lead screw I; 75, mounting plate I; 76, motor I; 77, sliding groove I; 78, sliding block I;

[0034] 8, clamping assembly; 81, mounting plate III; 82, sliding plate; 83, lead screw II; 84, threaded groove I; 85, threaded groove II; 86, mounting plate II; 87, gear; 88, rack; 89, electric push rod; 810, threaded hole II; 811, rotating shaft II; 812, sliding block II; 813, sliding groove II; 814, threaded hole I;

[0035] 9, U-shaped groove; 10, frame body; 11, device mounting plate; 12, driving device; 13, code disc; 14, code gear; 15, mounting frame;

[0036] 16, rotary position sensor; 17, key shaft; 18, pulley; 19, motor II; 20, distance sensor. DETAILED DESCRIPTION

[0037] The following will be described in detail with reference to the accompanying drawings Figures 1-6 The present application will be further described in detail.

[0038] The sampling assembly of the biochemical analyzer is disclosed in the embodiments of the present application.

[0039] Reference will be made to Figure 1 , Figure 2The utility model discloses a sampling assembly of biochemical analyzer, including frame body 10 and bottom plate 2 that activity installs at the bottom of shell 1, and frame body 10 sets up inside biochemical analyzer, and the top fixed mounting of frame body 10 has device mounting plate 11, and the top fixed setting of device mounting plate 11 has driving device 12, and driving device 12 includes code disc 13 that rotates and installs in the top center of device mounting plate 11, and a plurality of code teeth 14 are uniformly arranged along the outer ring of code disc 13, and the tooth spacing between every code tooth 14 is equal, and the number of teeth of code tooth 14 is determined by the angle size of sampling needle 3 rotation, when the angle of sampling needle 3 that needs to rotate becomes big, then the number of teeth of code tooth 14 that needs to be arranged on code disc 13 increases, when the angle of sampling needle 3 that needs to rotate becomes small, then the number of teeth of code tooth 14 that needs to be arranged on code disc 13 reduces, according to different working condition requirement, can design the code disc 13 of different tooth number, and according to the angle of sampling needle 3 rotation, changes the code disc 13 of different tooth number, along the circumferential direction of code disc 13, fixedly set up mounting bracket 15 on device mounting plate 11, fixedly install rotary position sensor 16 on mounting bracket 15, the top center fixed connection of code disc 13 has second pulley 18, the top center fixed connection of second pulley 18 has key shaft 17, and the end of key shaft 17 away from second pulley 18 is activity and is connected in the bottom of bottom plate 2 and is fixedly connected in the lateral wall of the shell of biochemical analyzer, and the distance sensor 20 fixedly covers the surface of sampling needle 3, and arc-shaped guard plate one 4 and arc-shaped guard plate two 5 are symmetrically arranged and are fixedly installed in the bottom of connecting plate 6, and the U-shaped groove 9 that is compatible with the shape of sampling needle 3 is opened in the top of connecting plate 6.

[0040] During operation of the biochemical analyzer, the code disk 13 rotates under the drive of the drive device 12. The rotational position sensor 16 detects each code tooth 14, generating a pulse signal, which is then transmitted to the control system. Therefore, the control system receives the pulse signal at a fixed interval. The control system uses this interval to determine whether the code disk 13 is rotating normally. This control system is conventional in the art, and therefore, the control system can utilize existing control systems. When the biochemical analyzer is operating normally, the code disk 13 rotates continuously. The sensor detects each code tooth 14 on the code disk 13, generating a pulse signal, and transmits this signal to the control system at preset intervals. The control system then transmits the pulse signal to motor 2 19, causing motor 2 19 to operate normally. When the biochemical analyzer is disturbed by the outside world during operation and cannot rotate normally and continuously, when an obstacle collides with the shell 1, the code disk 13 cannot rotate normally and continuously, and the rotation position sensor 16 cannot continuously detect the code teeth 14 on the code disk 13 to form a pulse signal. Within the preset time, the control system does not receive the pulse signal, and the control system can determine that the code teeth 14 are rotating abnormally. At this time, the control system transmits the signal to the motor 2 19 of the drive device 12. The motor 2 19 receives the signal and stops rotating to prevent the biochemical analyzer from continuing to operate and being damaged; at the same time, the control system will transmit the signal of the abnormal rotation of the code teeth 14 to the alarm system (not shown in the figure), and the alarm system will sound an alarm to remind the staff to perform fault detection and maintenance.

[0041] Reference Figure 3 、 Figure 4 , the sliding assembly 7 is fixedly set on the side of the bottom plate 2 away from the connecting plate 6, the sliding assembly 7 includes a screw 74, and the mounting plates 75 are symmetrically fixed on the left and right sides of the top of the bottom plate 2. The inner sides of the two mounting plates 75 are rotatably connected to two rotating shafts 72, and the two rotating shafts 72 set on the same mounting plate 75 are symmetrically set on the same horizontal line. A threaded hole that matches the shape of the screw 74 is opened on the side of the slider 78, and the screw 74 is threadedly connected in the threaded hole. The side of the slider 71 is opened with a threaded hole that matches the shape of the slide rod 73 The slide rod 73 is slidably installed in the slide hole, and both ends of the lead screw 74 and the slide rod 73 are fixedly connected to the corresponding inner end of the rotating shaft 72. The top of the base plate 2 is penetrated by a slide groove 77 that is adapted to the shape of the slider 1 78 and the slider 2 71. The bottoms of the slider 1 78 and the slider 2 71 pass through the slide groove 77 and are fixedly connected to the top of the connecting plate 6. The motor 1 76 is fixedly installed on the outside of one of the mounting plates 1 75. The output end of the motor 1 76 passes through the side wall of the mounting plate 1 75 and is fixedly connected to the center of the outer end of the rotating shaft 1 72.

[0042] When the height of the obstacle is lower than the shell 1 and the bottom plate 2, the code disc 13 continues to rotate, when it rotates to the distance between the distance sensor 20 and the inductive collision object is less than 10 centimeters, the distance sensor 20 detects the distance and transmits a signal to the single-chip microcomputer, the single-chip microcomputer compares the distance with the preset threshold (such as 10 centimeters), controls the output shaft of the motor 76 to rotate, the output shaft of the motor 76 drives the lead screw 74 fixedly connected therewith to rotate, and the sliding block 78 on the surface of the threaded lead screw 74 slides in the sliding groove 77, and under the cooperation of the sliding rod 73 and the sliding groove 77, the connecting plate 6 slides towards the sampling needle 3, the arc-shaped protective plate 4 and the arc-shaped protective plate 5 slide to the position corresponding to the sampling needle 3, and then the control system drives the motor 76 to stop rotating.

[0043] Reference Figures 5-7 The clamping assembly 8 is fixedly arranged at the bottom of the connecting plate 6, the clamping assembly 8 comprises a rack 88, two sliding plates 82 are fixedly arranged at the outer sides of the arc-shaped protective plate 4 and the arc-shaped protective plate 5 respectively, two mounting plates three 81 are symmetrically fixedly arranged at the bottom of the connecting plate 6, threaded grooves one 84 and two 85 are arranged at the two ends of the surface of the lead screw two 83 respectively, the threaded grooves one 84 and two 85 are opposite in rotation direction, threaded holes one 814 and two 810 are arranged at the central parts of the side surfaces of the two sliding plates 82 respectively, the threaded holes one 814 and two 810 are adapted to the shapes of the threaded grooves one 84 and two 85, the lead screw two 83 is threadedly connected in the threaded holes one 814 and two 810, shafts two 811 are fixedly arranged at the central parts of the two ends of the lead screw two 83, the shafts two 811 are rotatably connected to the inner central parts of the two mounting plates three 81 respectively, one of the shafts two 811 is movably arranged through the side wall of the mounting plate three 81 and is fixedly connected with a gear 87, the connecting plate 6 is fixedly arranged at one side of the bottom of the mounting plate two 86, a sliding groove two 813 is arranged at the bottom of the connecting plate 6 and is adapted to the shape of a sliding block three 812, the sliding block three 812 is arranged in the sliding groove two 813 and realizes horizontal sliding, the rack 88 is fixedly arranged at the bottom of the sliding block three 812, the rack 88 is engaged with the gear 87, and an electric push rod 89 is fixedly arranged at the top of the mounting plate two 86, one end of the rack 88 is fixedly connected with the output shaft of the electric push rod 89.

[0044] The arc-shaped protective plate one 4 and the arc-shaped protective plate two 5 slide to the position corresponding to the sampling needle 3, and then the control system drives the motor one 76 to stop rotating, and simultaneously starts the electric push rod 89, the electric push rod 89 pushes the rack 88, the rack 88 drives the gear 87 engaged with the rack 88 to rotate, and then drives the lead screw two 83 fixedly connected with the gear 87 to rotate, drives the two sliding plates 82 symmetrically sleeved on the surface of the lead screw two 83 to slide towards each other, and then drives the arc-shaped protective plate one 4 and the arc-shaped protective plate two 5 to slide relative to each other, so that the arc-shaped protective plate one 4 and the arc-shaped protective plate two 5 are combined together, and then the sampling needle 3 is isolated in the arc-shaped protective plate one 4 and the arc-shaped protective plate two 5, so as to avoid that the sampling needle 3 is bent due to collision.

[0045] The motor one 76, the electric push rod 89, the motor two, the rotary position sensor 16 and the distance sensor 20 are prior art, and the device further comprises a single-chip microcomputer, a microprocessor, a control system, an alarm system and the like, and the rotary position sensor 16 is OPB880T51Z produced by TT Electronics.

[0046] The implementation principle of the sampling assembly of the biochemical analyzer is as follows: when the biochemical analyzer works normally, the code disc 13 continuously rotates, the rotary position sensor 16 can detect each code tooth 14 on the code disc 13 to form a pulse signal, and the signal is transmitted to the control system within a preset time interval, the control system transmits the pulse signal to the motor two 19, and the motor two 19 normally operates; when the height of the obstacle is higher than the bottom plate 2, the obstacle will collide with the shell 1, when the obstacle collides with the shell 1, the code disc 13 cannot continuously rotate normally, the rotary position sensor 16 cannot continuously detect the code tooth 14 on the code disc 13 to form a pulse signal, and within a preset time, the control system cannot receive the pulse signal, so that the control system can judge that the code tooth 14 does not rotate normally, at this time, the control system transmits the signal to the motor two 19 of the driving device 12, the motor two 19 receives the signal and stops rotating, so as to avoid that the biochemical analyzer continues to operate and is damaged; at the same time, the control system transmits the signal that the code tooth 14 does not rotate normally to the alarm system (not shown in the figure), the alarm system issues an alarm to remind the staff to detect and repair the fault;

[0047] When the height of the obstacle is lower than the shell 1 and the bottom plate 2, the code disc 13 continues to rotate, when rotating to the distance between the distance sensor 20 and the inductive collision object and the distance sensor 20 is less than 10 centimeters, the distance sensor 20 detects the distance and transmits the signal to the single-chip microcomputer, the single-chip microcomputer compares the distance with the preset threshold (such as 10 centimeters), controls the output shaft of the motor 76 to rotate, the output shaft of the motor 76 drives the lead screw 74 fixedly connected thereto to rotate, and the sliding block 78 on the surface of the threaded lead screw 74 slides in the sliding groove 77, and under the cooperation of the sliding rod 73 and the sliding groove 77, the connecting plate 6 slides towards the sampling needle 3, so that the arc-shaped protective plate 4 and the arc-shaped protective plate 5 slide to the position corresponding to the sampling needle 3, and then the control system drives the motor 76 to stop rotating, and starts the electric push rod 89, the electric push rod 89 pushes the rack 88, the rack 88 drives the gear 87 engaged with the rack 88 to rotate, and then drives the lead screw 83 fixedly connected with the gear 87 to rotate, drives the two sliding plates 82 symmetrically sleeved on the surface of the lead screw 83 to slide towards each other, and then drives the arc-shaped protective plate 4 and the arc-shaped protective plate 5 to slide relative to each other, so that the arc-shaped protective plate 4 and the arc-shaped protective plate 5 are combined together, and then the sampling needle 3 is isolated in the arc-shaped protective plate 4 and the arc-shaped protective plate 5, so as to avoid the sampling needle 3 from being bent due to collision. When the obstacle collides with the arc-shaped protective plate 4 and the arc-shaped protective plate 5, the code disc 13 cannot normally continue to rotate, and the rotary position sensor 16 cannot continuously detect the code teeth 14 on the code disc 13, forming a pulse signal. Within a preset time, the control system does not receive the pulse signal, and the control system can judge that the code teeth 14 do not rotate normally. At this time, the control system transmits a signal to the motor 19 of the driving device 12, the motor 19 receives the signal and stops rotating, so as to avoid the biochemical analyzer from continuing to operate and being damaged; at the same time, the control system transmits the signal of the abnormal rotation of the code teeth 14 to the alarm system (not shown in the figure), and the alarm system issues an alarm to remind the staff to detect and repair the fault.

[0048] The above is only an optional embodiment of the present disclosure and is not used to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A sampling assembly of a biochemical analyzer, comprising a bottom plate (2) movably mounted at the bottom of a housing (1), and a sampling needle (3) fixedly mounted at one end of the bottom of the bottom plate (2), characterized in that: The sampling needle (3) is provided with a distance sensor (20) fixedly sleeved on the surface, the bottom plate (2) is provided with a connecting plate (6) slidably installed at the center, the left and right sides of the bottom of the connecting plate (6) are respectively provided with arc-shaped protection plates (4) and (5) fixedly installed, the side, away from the connecting plate (6), of the bottom plate (2) is provided with a sliding assembly (7) for driving the connecting plate (6) to slide on the bottom of the bottom plate (2), the sliding assembly (7) comprises a lead screw (74) rotatably installed between two installation plates (75) for driving a sliding block (78) to slide in a sliding groove (77).

2. The sampling assembly of a biochemical analyzer according to claim 1, characterized in that: Both of the installation plates (75) are fixedly installed on the top of the bottom plate (2) and arranged symmetrically left and right, the sliding rod (73) is rotatably installed between the two installation plates (75) through a rotating shaft (72), the sliding rod (73) is arranged symmetrically with the lead screw (74), the sliding block (71) is slidably sleeved on the sliding rod (73), the sliding block (78) is threadedly sleeved on the surface of the lead screw (74), and the bottom ends of the sliding block (78) and the sliding block (71) are movably penetrated through the side wall of the bottom plate (2) and fixedly installed on the top of the connecting plate (6).

3. The sampling assembly of a biochemical analyzer according to claim 2, characterized in that: The sliding groove (77) is provided with two and is provided in the bottom of the bottom plate (2), the sliding block (78) and the sliding block (71) are located in the corresponding sliding groove (77) and realize horizontal sliding, and the outside of one of the installation plates (75) is provided with a motor (76).

4. The sampling assembly of a biochemical analyzer according to claim 1, characterized in that: The outside of the arc-shaped protection plate (4) and the arc-shaped protection plate (5) is fixedly connected with a sliding plate (82), the bottom of the connecting plate (6) is symmetrically fixedly connected with an installation plate (81), the two installation plates (81) are rotatably connected through a rotating shaft (811), and the two sliding plates (82) are symmetrically threadedly sleeved on the surface of the lead screw (83).

5. The sampling assembly of a biochemical analyzer according to claim 4, characterized in that: The surface of the lead screw (83) is provided with a thread groove (84) and a thread groove (85) with opposite rotation directions.

6. The sampling assembly of a biochemical analyzer according to claim 4, characterized in that: The installation plate (86) is fixedly installed on one side of the bottom of the connecting plate (6), the top of the rack (88) is fixedly connected with a sliding block (812), the bottom of the installation plate (86) is provided with a sliding groove (813) matched with the shape of the sliding block (812), the sliding block (812) is located in the sliding groove (813) and realizes horizontal sliding, and the top of the installation plate (86) is provided with an electric push rod (89), and the output shaft of the electric push rod (89) is fixedly connected with one end of the rack (88).

7. The sampling assembly of a biochemical analyzer according to claim 6, characterized in that: The outer end of the rotating shaft (811) is provided with a gear (87) engaged with the rack (88).

8. The sampling assembly of a biochemical analyzer according to claim 1, characterized in that: The top of the connecting plate (6) is provided with a U-shaped groove (9) matched with the shape of the sampling needle (3).

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