A test tube capping device

Abstract

The present invention relates to a test tube capping device, which includes a cover body conveying mechanism, comprising a hopper and a conveyor belt arranged below the hopper, the width of the conveyor belt matching the diameter of the cover body; a cover body steering mechanism, including a steering shaft provided with a cover body through portion, the cover body through portion matching the shape of the cover body, the cover body through portion being connected to the conveyor belt, and the steering shaft being rotatable for adjusting the orientation of the cover body; and a cover body pressing mechanism, the cover body pressing mechanism including a pressing block and a driving part connected to the pressing block, the driving part being used to drive the pressing block to reciprocate in a direction close to or away from the test tube, and the pressing block being connected to the steering shaft. The test tube capping device of the present invention can realize the orderly transportation of the cover body, and can control the transportation speed thereof to ensure that the cover body will not accumulate during the transportation process, and has a simple structure, and can improve the accuracy of alignment between various types of test tubes and the cover body.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and specifically relates to a test tube capping device. Background Art

[0002] Currently, the automation of medical tests is achieved through a test line. The sample containers to be tested are vacuum blood collection tubes. When testing, the vacuum blood collection tubes need to be uncapped for the next step of automatic sampling and testing. The tested samples will be stored for a certain period of time for subsequent recheck. To ensure the effectiveness of the samples, the vacuum blood collection tubes need to be capped and stored. Currently, the medical test automation line uses the method of aluminum foil hot melting to encapsulate the vacuum blood collection tubes. There may be problems such as loose encapsulation, and it can only encapsulate plastic vacuum blood collection tubes, not glass ones. Special film removal equipment is required for recheck, and the original uncapping equipment cannot be used, increasing the number of devices and space occupation. In addition, the existing film sealing machine on the medical test automation line uses a rack for lifting, a connecting rod cylinder for rotation, and a sealing head for electrically heating the aluminum film to melt the blood collection tube and the aluminum film by high temperature for welding to achieve encapsulation. The structure is complex, the processing difficulty is large, the cost is high, the sealing head needs to be cleaned regularly, and the mechanical failure rate is high. Summary of the Invention

[0003] The purpose of the present invention is to provide a test tube capping device to solve the technical problems mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution. A test tube capping device includes:

[0005] A cap conveying mechanism, the cap conveying mechanism includes a hopper and a conveyor belt arranged below the hopper. The conveyor belt is used to convey caps, and the width of the conveyor belt matches the diameter of the caps;

[0006] A cap turning mechanism, the cap turning mechanism includes a turning shaft. The turning shaft is provided with a cap through portion, and the shape of the cap through portion matches the shape of the cap. The cap through portion is connected to the conveyor belt, and the turning shaft is rotatable to adjust the orientation of the cap;

[0007] And a cap pressing mechanism, the cap pressing mechanism includes a pressing block and a driving part connected to the pressing block. The driving part is used to drive the pressing block to reciprocate in a direction close to or away from the test tube, and the pressing block is connected to the turning shaft.

[0008] As a preferred solution, the cap conveying mechanism further includes a roller arranged between the hopper and the conveyor belt. The roller is connected to the bottom of the hopper. The roller is provided with a plurality of grooves for transporting caps. The bottom of the hopper is provided with cap holes matching the grooves, and the roller is rotatable.

[0009] As a preferred solution, the cross-sectional diameter of the groove matches the diameter of the cover body, and the depth of the groove ≥ the height of the cover body.

[0010] As a preferred solution, first inclined plates and second inclined plates are respectively arranged on both sides of the conveyor belt along the length direction.

[0011] As a preferred solution, the cover body conveying mechanism further includes a guiding block, and the conveyor belt is connected to the cover body through hole part through the guiding block.

[0012] As a preferred solution, one end of the steering shaft is connected with an azimuth plate. The azimuth plate is semicircular, coaxially arranged with the steering shaft and rotates synchronously. The azimuth plate is used to confirm that the cover body through hole part rotates in place.

[0013] As a preferred solution, a through groove matching the shape of the steering shaft is arranged inside the pressing block. The steering shaft is arranged in the through groove. First through holes and second through holes matching the diameter of the cover body are respectively arranged at the side end and the bottom end of the pressing block.

[0014] As a preferred solution, the cover body pressing mechanism further includes a guiding block connected to the bottom end of the pressing block through a torsion spring. The guiding blocks are arranged in two and are arranged oppositely. The upper end faces of the two guiding blocks are oppositely circular and are coaxial with the second through hole. The circle formed by the upper end faces of the two guiding blocks matches the outer diameter of the test tube.

[0015] As a preferred solution, the lower end faces of the two guiding blocks are oppositely circular and are coaxial with the second through hole. The diameter of the circle formed by the lower end faces is larger than the diameter of the circle formed by the upper end faces.

[0016] As a preferred solution, the test tube capping device further includes a test tube fixing mechanism arranged below the cover body pressing mechanism. The test tube fixing mechanism includes a pneumatic finger and a test tube clamping jaw connected to the pneumatic finger.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1) The test tube capping device provided by the present invention can easily realize the installation of the test tube cover body. The structure is delicate and safe. The installation and opening of the cover body are both simple and convenient;

[0019] 2) By setting the rotating roller shaft and the groove to transfer the cover body, not only can the orderly transfer of the cover body be realized, but also the transfer speed can be controlled to ensure that the cover body will not accumulate during the transfer process. On the other hand, this transfer method will not generate noise, can ensure a quiet working environment at the operation site, and is beneficial to the physical and mental health of the operators;

[0020] 3) The state of the cover body receiving and the cover body pressing down can be switched by rotating the steering shaft, and the opening end of the cover body can be adjusted by rotating the steering shaft clockwise and counterclockwise. There is no need to add a link for adjusting the orientation of the opening end of the cover body in the front-end link, and multiple functions and effects can be achieved with a simple structural design;

[0021] 4) The structure of the alignment block expands the range of test tubes that can be matched and ensures the accuracy of the alignment between various types of test tubes and the cover body. Through the coordinated cooperation of the guide piece structure, the slide table cylinder, and various sensors, the accurate alignment of the test tube and the cover body is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the test tube capping device and the test tube transmission track of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of a test tube capping device of the present invention;

[0024] Figure 3 It is a schematic diagram of a partial structure of a test tube capping device of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the conveyor belt drive assembly;

[0026] Figure 5 It is a schematic diagram of the structure of the cover body steering mechanism and the cover body pressing mechanism;

[0027] Figure 6 It is a schematic diagram of the structure of the steering mechanism;

[0028] Figure 7 It is a schematic diagram of the structure of the steering mechanism from another angle;

[0029] Figure 8 It is a schematic diagram of the structure of the pressing block;

[0030] Figure 9 It is a schematic diagram of the structure of the alignment block.

[0031] The meanings of the various reference numerals in the figure are as follows:

[0032] 1 - First connecting plate, 2 - Second connecting plate, 3 - Third connecting plate, 4 - Fourth connecting plate, 5 - Fifth connecting plate, 6 - Sixth connecting plate, 7 - Hopper, 8 - Conveyor belt, 9 - Conveyor belt drive assembly, 901 - Mounting side plate, 902 - First motor, 903 - Idler pulley, 904 - Conveyor belt support plate, 905 - Driving pulley, 10 - First inclined plate, 11 - Second inclined plate, 12 - Roller, 13 - Groove, 14 - Second motor, 15 - Guide block, 16 - Cover body detection sensor, 17 - Steering shaft, 18 - Cover body through portion, 19 - Third motor, 20 - Cover body orientation detection sensor, 21 - Cover body in place detection sensor, 22 - Azimuth plate, 23 - Steering detection sensor, 24 - Pressing block, 25 - Slide table cylinder, 26 - Adapter block, 27 - Guide piece, 28 - Through groove, 29 - First through hole, 30 - Second through hole, 31 - Alignment block, 32 - Pneumatic finger, 33 - Test tube gripper, 33 - Test tube transfer track, 34 - Test tube capping device. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 thus should not be construed as a limitation to the present invention.

[0035] See Figure 1 、 Figure 2 The present invention discloses a test tube capping device for adding a cover body to a test tube, including a cover body conveying mechanism, a cover body steering mechanism, and a cover body pressing mechanism. The cover body conveying mechanism is used to sequentially and orderly convey the cover body to the cover body steering mechanism. The cover body steering mechanism is used to receive the cover body, judge the orientation of the cover body, and adjust the cover body to the correct capping orientation. The cover body pressing mechanism includes a pressing block 24 and a driving part connected to the pressing block 24. The driving part is used to drive the pressing block 24 to reciprocate in a direction close to or away from the test tube, and then control the cover body steering mechanism to move downward and perform a pressing action. After the cover body is capped on the test tube, an upward movement is performed.

[0036] This test tube capping device includes a fixed frame composed of a first connecting plate 1, a second connecting plate 2, a third connecting plate 3, and a fourth connecting plate 4. Inside the fixed frame, a fifth connecting plate 5 and a sixth connecting plate 6 are respectively connected by the third connecting plate 3 and the fourth connecting plate 4 for auxiliary fixation.

[0037] See Figure 3 , Figure 4, the cap conveying mechanism includes a hopper 7 for storing caps and a conveyor belt 8 disposed below the hopper 7. The two side ends of the hopper 7 are respectively provided with protruding connecting ends, and are respectively connected to the fifth connecting plate 5 and the sixth connecting plate 6 through the connecting ends. The hopper 7 is integrally seated on the third connecting plate 3 and the fourth connecting plate 4. The longitudinal section of the hopper 7 is an irregular V-shaped body, which is convenient for the caps to be concentrated at the bottom of the hopper 7. A cap hole is opened at the bottom of the hopper 7, and the cap falls through the cap hole onto the conveyor belt 8 and is conveyed by the conveyor belt 8 into the next link. The movement of the conveyor belt 8 is controlled by a conveyor belt driving assembly 9. The conveyor belt driving assembly 9 includes mounting side plates 901 fixedly connected through the fifth connecting plate 5 and the sixth connecting plate 6 at both ends. A first motor 902 and an idler pulley 903 are respectively connected to both ends of the mounting side plate 901. A conveyor belt supporting plate 904 is also connected to the side end of the mounting side plate 901. A driving pulley 905 is connected to the shaft end of the first motor 902. A conveyor belt 8 is connected between the driving pulley 905 and the idler pulley 903, and the conveyor belt 8 is controlled to perform a conveying action by the first motor 902. In one embodiment, first inclined plates 10 and second inclined plates 11 are respectively connected to both sides of the conveyor belt 8 in the length direction. The first inclined plates 10 and the second inclined plates 11 are respectively connected to the third connecting plate 3 and the fourth connecting plate 4 on both sides in the length direction, and are respectively connected to the fifth connecting plate 5 and the sixth connecting plate 6 on both sides in the width direction. The first inclined plates 10 and the second inclined plates 11 are relatively substantially V-shaped, which is convenient for the caps to slide onto the lower conveyor belt 8. A certain gap needs to be left between the bottom ends of the first inclined plates 10 and the second inclined plates 11 and the conveyor belt 8 to ensure the smoothness of the conveying of the conveyor belt 8. In another embodiment, the width of the conveyor belt 8 matches the diameter of the cap, ensuring that the posture of the cap on the conveyor belt 8 is: the length direction of the cap is consistent with the length direction of the conveyor belt 8, making the subsequent link of adjusting the orientation of the cap more convenient. In a preferred embodiment, the cap conveying mechanism further includes a roller 12 disposed between the hopper 7 and the conveyor belt 8. The two ends of the roller 12 are respectively connected through the fifth connecting plate 5 and the sixth connecting plate 6. The roller 12 is disposed at the bottom of the hopper 7. A plurality of grooves 13 are provided on the roller 12. The number, shape and grooves 13 of the cap holes provided at the bottom of the hopper 7 match. The cap enters the grooves 13 through the cap holes. The roller 12 is rotatable. By rotating, the openings of the grooves 13 face the direction of the conveyor belt 8, thereby realizing the sequential transfer of the caps. The number of the cap holes and the grooves 13 is preferably set to two each, further realizing the orderly transfer of the caps. One end of the roller 12 is connected to a second motor 14. The second motor 14 is fixed on the sixth connecting plate 6. The roller 12 is driven to rotate by the second motor 14, thereby further controlling the transfer speed of the caps.To ensure the normal transportation of the cover body and the smooth rotation of the roller 12, the cross-sectional diameter of the groove 13 should match the diameter of the cover body, so that the groove 13 is large enough to accommodate the cover body, and the depth of the groove 13 ≥ the height of the cover body, ensuring that the roller 12 will not interfere with the first inclined plate 10 and the second inclined plate 11 during rotation. By setting the rotating roller 12 and the groove 13 for transporting the cover body, not only can the orderly transportation of the cover body be realized, but also the transportation speed can be controlled to ensure that the cover body will not accumulate during transportation. On the other hand, this transportation method will not generate noise, can ensure a quiet working environment at the operation site, and is beneficial to the physical and mental health of the operators.

[0038] Furthermore, the cover body conveying mechanism further includes a guiding block 15 for connecting the conveyor belt 8 and the cover body turning mechanism. The guiding block 15 is fixed on the mounting side plate 901 and the conveyor belt support plate 904. Correspondingly, a notch adapted to the entry end of the guiding block 15 is provided on the fifth connecting plate 5, and the cover body transitions from the conveyor belt 8 to the cover body turning mechanism via the guiding block 15. Moreover, a cover body detection sensor 16 is further connected to the fifth connecting plate 5. The cover body detection sensor 16 is arranged on one side of the guiding block 15 for detecting whether there is a cover body in the guiding block 15, and the second motor 14 is controlled to rotate intermittently according to the detection signal by the corresponding control system, further ensuring the orderly conveyance of the cover body.

[0039] See Figures 5 - 7, the cover body turning mechanism is arranged on the side of the cover body conveying mechanism. The whole cover body turning mechanism is fixed on the first connecting plate 1 through the cover body pressing mechanism. The cover body turning mechanism includes a turning shaft 17. The turning shaft 17 is provided with a cover body through hole 18. The cover body through hole 18 is arranged through the turning shaft 17 at a position approximately in the middle along the width direction of the turning shaft 17. The shape of the cover body through hole 18 matches that of the cover body. The cover body through hole 18 is connected to the conveyor belt 8 through a guide block 15. The cover body conveyed on the conveyor belt 8 enters the cover body through hole 18 via the guide block 15. At this time, the posture of the cover body in the cover body through hole 18 is the same as its posture on the conveyor belt 8, that is, in a horizontal state. The turning shaft 17 can rotate. By rotating, the cover body through hole 18 is adjusted to a vertical state, and at the same time, the cover body inside is adjusted to a vertical state. By rotating the turning shaft 17, the cover body through hole 18 can be switched between a horizontal state and a vertical state, that is, switched between the cover body receiving state and the cover body pressing state. One end of the turning shaft 17 is connected to a third motor 19, and the third motor 19 is used to drive the turning shaft 17 to rotate. It can be understood that the horizontal posture of the cover body in the cover body through hole 18 can be divided into two situations, that is, the open end of the cover body can face the two ends of the cover body through hole 18 respectively. The third motor 19 can be controlled to rotate clockwise or counterclockwise according to the orientation of the open end of the cover body, so as to ensure that when the cover body through hole 18 is in a vertical state, the open end of the cover body faces the lower test tube direction. A cover body orientation detection sensor 20 is connected to the side end of the pressing block 24. The cover body orientation detection sensor 20 is used to detect the orientation of the open end of the cover body. According to the detection signal, the corresponding control system controls the third motor 19 to rotate clockwise or counterclockwise. A cover body in-place detection sensor 21 is also connected to the upper end of the pressing block 24. The cover body in-place detection sensor 21 is used to detect whether the cover body enters in place in the cover body through hole 18. According to the detection signal, the corresponding control system controls the third motor 19 to rotate. In one embodiment, a positioning plate 22 is connected to the end of the turning shaft 17 far from the third motor 19. The positioning plate 22 is in the shape of a semicircular plate, is coaxially arranged with the turning shaft 17 and rotates synchronously. The diameter side of the positioning plate 22 is perpendicular to the axis of the cover body through hole 18. The setting of the positioning plate 22 is convenient for the operator to observe and confirm whether the horizontal state and the vertical state of the cover body through hole 18 are rotated in place. Further, a turning detection sensor 23 for detecting the orientation of the positioning plate 22 is also connected to the pressing block 24. The rotation angle of the turning shaft 17 is determined by the state of the positioning plate 22 blocking the turning detection sensor 23, and then it is judged whether the cover body through hole 18 of the turning shaft 17 is rotated in place, so as to prevent sudden failures such as the third motor 19 being blocked or losing steps.

[0040] See Figure 5 , Figure 8, the cover pressing mechanism, including a pressing block 24 and a driving part connected to the pressing block 24. The pressing block 24 is connected to the steering shaft 17. The driving part is used to drive the pressing block 24 to reciprocate in the direction close to or away from the test tube, thereby driving the cover in the steering shaft 17 to reciprocate in the direction close to or away from the test tube to complete the installation and reset of the cover. The driving part is connected to the first connecting plate 1. The driving part is usually selected as a cylinder to facilitate the control of the pressing force of the cover by adjusting the pressure, which can be adapted to test tubes of different specifications. The cylinder is preferably a slide cylinder 25 with higher guiding accuracy and stronger load capacity to ensure the alignment accuracy between the cover and the test tube. The pressing block 24 is connected to the lower end of the slide of the slide cylinder 25. A guiding piece 27 is also connected through an adapter block 26 at the middle position of the slide. The lower end of the guiding piece 27 is connected to the side of the pressing block 24. The guiding piece 27 plays a guiding role for the upward and downward movement of the pressing block 24, and the pressing block 24 is fixed and driven to move at both ends of the pressing block 24 through the slide and the guiding piece 27, which can further ensure the stability of the pressing block 24 and thus ensure the alignment accuracy between the cover and the test tube. Further, a through groove 28 matching the shape of the steering shaft 17 is provided inside the pressing block 24. The steering shaft 17 is arranged in the through groove 28. One end of the steering shaft 17 connected to the orientation plate 22 extends out of the pressing block 24. The orientation plate 22 is arranged outside the pressing block 24. The side end and the bottom end of the pressing block 24 are respectively provided with a first through hole 29 and a second through hole 30 matching the diameter of the cover. The side end refers to the end facing the guiding block 15. When the through part 18 of the cover is in a horizontal state, the first through hole 29 connects the through part 18 of the cover as the cover entry channel. When the through part 18 of the cover is in a vertical state, the second through hole 30 connects the through part 18 of the cover as the cover pressing channel.

[0041] See Figure 9, in one embodiment, the cover pressing mechanism further includes a guiding block 31 connected to the bottom end of the pressing block 24 through a torsion spring. The guiding blocks 31 are provided in two and are oppositely arranged on both sides of the second through hole 30. The upper end surfaces of the two guiding blocks 15 are oppositely circular in contour and coaxial with the second through hole 30. The circle formed by the upper end surfaces of the two guiding blocks 31 matches the outer diameter of the test tube, that is, the diameter of this circular contour is smaller than the diameter of the second through hole 30. When the cover through hole 18 is in a vertical state, the cover located in the cover through hole 18 will not fall off from the cover through hole 18 by itself due to the blocking of the two guiding blocks 31. When the cover through hole 18 is pressed down, the two guiding blocks 31 can be sleeved on the outer side of the test tube, and then the pressing block 24 covers the cover onto the test tube. When the pressing block 24 moves upward, since the guiding block 31 is connected through a torsion spring, the guiding block 31 will rotate and open due to the elastic force to adapt to the cover and will not push the covered cover out of the test tube. In a preferred embodiment, the lower end surfaces of the two guiding blocks 31 are oppositely circular in contour and coaxial with the second through hole 30, and the diameter of the circle formed by the lower end surfaces is larger than the diameter of the circle formed by the upper end surfaces. Currently, the quality of test tubes used in medical equipment varies, and there may be test tubes with a certain degree of curvature passing the quality inspection and being put into use. When using such test tubes, the alignment with the cover may deviate due to the small curvature of the test tubes themselves. The structure of the guiding block 31, that is, the diameter of the circle formed by the opposite lower end surfaces of the guiding block 31 is larger than the outer diameter of the test tube, can be used to further guide the test tube with curvature by using the internal inclined surface between the upper end surface and the lower end surface of the guiding block 31, so that the guiding block 31 can be smoothly sleeved on the outer side of the test tube, and the test tube and the cover are accurately aligned.

[0042] The test tube capping device provided by the present invention further includes a test tube fixing mechanism arranged below the cover pressing mechanism. The test tube fixing mechanism is used to fix the test tube to be capped to ensure the stability of the test tube during the capping process. The test tube fixing mechanism includes a pneumatic finger 32 and a test tube jaw 33 connected to the pneumatic finger 32. The test tube jaw 33 is arranged at the lower end of the second through hole 30 to ensure relatively accurate alignment between the cover and the test tube.

[0043] The test tube capping device 34 provided by the present invention is usually fixed to the side end of the test tube transmission track 33, and the test tube transmission track 33 is usually part of a medical testing production line. The present invention uses a hopper 7 to hold scattered test tube caps. There are rollers 12 at the bottom of the hopper 7, and grooves 13 matching the test tube caps are provided on the rollers 12. The rollers 12 rotate to let the caps fall into the grooves 13, and continue to rotate to drop the caps onto the moving conveyor belt 8. Through the transmission of the conveyor belt 8 and via the guiding block 15, the caps are sent into the rotating shaft. The uncapped test tubes are transported to the lower part of the test tube capping device through the test tube transmission track 33. The pneumatic fingers 32 are ventilated to drive the test tube grippers 33 to close and clamp the test tubes. The opening end direction of the cap is judged by the cap orientation detection sensor 20. The control system controls the third motor 19 to rotate the rotating shaft clockwise or counterclockwise to make the cap opening face downward. At this time, it just stops above the test tube. The slide cylinder 25 is ventilated to drive the pressing block 24 to press down, and the test tube cap is pressed into the test tube to complete capping. The slide cylinder 25 is ventilated in the reverse direction to drive the pressing block 24 to lift up, and the rotating shaft rotates 90° to return to its position, waiting for a new cap to be sent in. The pneumatic fingers 32 are ventilated in the reverse direction to drive the test tube grippers 33 to open and release the capped test tube, waiting for a new test tube to be sent in.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A test tube capping device, characterized in that Comprising: A cover body conveying mechanism, the cover body conveying mechanism includes a hopper (7) and a conveyor belt (8) arranged below the hopper (7), the conveyor belt (8) is used for conveying the cover body, the width of the conveyor belt (8) matches the diameter of the cover body, and first inclined plates (10) and second inclined plates (11) are respectively arranged on both sides of the conveyor belt (8) along the length direction; A cover body steering mechanism, the cover body steering mechanism includes a steering shaft (17), the steering shaft (17) is provided with a cover body through portion (18), the shape of the cover body through portion (18) matches the shape of the cover body, the cover body through portion (18) is connected to the conveyor belt (8), and the steering shaft (17) is rotatable for adjusting the orientation of the cover body; And a cover body pressing mechanism, the cover body pressing mechanism includes a pressing block (24) and a driving portion connected to the pressing block (24), the driving portion is used for driving the pressing block (24) to reciprocate in a direction close to or away from the test tube, and the pressing block (24) is connected to the steering shaft (17); A through groove (28) matching the shape of the steering shaft (17) is arranged inside the pressing block (24), the steering shaft (17) is arranged in the through groove (28), and a first through hole (29) and a second through hole (30) matching the diameter of the cover body are respectively arranged at the side end and the bottom end of the pressing block (24); The cover body pressing mechanism further includes a guiding block (31) connected to the bottom end of the pressing block (24) through a torsion spring, the guiding blocks (31) are arranged in two and are arranged oppositely, the upper end surfaces of the two guiding blocks (31) are relatively circular in contour and are coaxial with the second through hole (30), the circle formed by the upper end surfaces of the two guiding blocks (31) matches the outer diameter of the test tube, the diameter of the circular contour is smaller than the diameter of the second through hole (30), when the cover body through portion (18) is in a vertical state, the cover body located in the cover body through portion (18) will not fall off from the cover body through portion (18) by itself due to the blocking of the two guiding blocks (31), when the cover body through portion (18) is pressed down, the two guiding blocks (31) are sleeved outside the test tube, and the pressing block (24) covers the cover body onto the test tube; The lower end surfaces of the two guiding blocks (31) are relatively circular in contour and are coaxial with the second through hole (30), and the diameter of the circle formed by the lower end surfaces is larger than the diameter of the circle formed by the upper end surfaces.

2. The test tube capping device according to claim 1, wherein, The cover body conveying mechanism further includes a roller (12) arranged between the hopper (7) and the conveyor belt (8), the roller (12) is connected to the bottom of the hopper (7), the roller (12) is provided with a plurality of grooves (13) for transporting the cover body, the bottom of the hopper (7) is provided with a cover body hole matching the grooves (13), and the roller (12) is rotatable.

3. The test tube capping device according to claim 2, characterized in that, The cross-sectional diameter of the groove (13) matches the diameter of the cover body, and the depth of the groove (13) ≥ the height of the cover body.

4. The test tube capping device according to claim 1, characterized in that, The cover body conveying mechanism further includes a guiding block (15), and the conveyor belt (8) is connected to the cover body through portion (18) through the guiding block (15).

5. The test tube capping device according to claim 1, wherein One end of the steering shaft (17) is connected with an azimuth plate (22). The azimuth plate (22) is semi-circular, coaxially arranged with the steering shaft (17) and rotates synchronously. The azimuth plate (22) is used to confirm that the cover body through portion (18) rotates in place.

6. The test tube capping device according to any one of claims 1-5, characterized in that, It further includes a test tube fixing mechanism arranged below the cover body pressing mechanism. The test tube fixing mechanism includes a pneumatic finger (32) and a test tube jaw (33) connected to the pneumatic finger (32).

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