Collection tube loading mechanism

Abstract

The present invention discloses a collection tube loading mechanism, comprising: a carrier; a turning platform having a positioning groove formed therein, capable of positioning and placing a collection tube; an elastic unit mounted on the carrier and located between the carrier and the turning platform, with a side perforation for the elastic unit to pass through and enter the positioning groove; a rocker; and an actuating handle. The carrier, the turning platform, the actuating handle, and the rocker are sequentially connected to form a double rocker mechanism. A locking rod is mounted on the actuating handle. As the locking rod gradually approaches a first stop, the turning platform drives the collection tube to gradually rotate from an inclined state, first passing through an upright state, and then returning to an upright state. The elastic unit deforms, first storing deformation energy, and then releasing some of the deformation energy. When the collection tube is in the upright state, the elastic unit cooperates with the groove wall of the positioning groove to position and compress the collection tube. The loading mechanism is very easy to operate, and the collection tube is stably fixed in the positioning groove and its relative position remains unchanged, so that the collection tube can accurately maintain an upright state.

Description

Technical Field

[0001] The present invention relates to the technical field of collection tube sampling, in particular to a collection tube loading mechanism. Background Art

[0002] Collection tubes are widely used in biochemical and clinical medical tests. Currently, testing institutions use a large number of collection tubes with stoppers at the mouth to collect samples first, then load the collection tube into the loading mechanism and keep it in an upright state, and then use the needle of the syringe to pierce the stopper of the collection tube and extract the sample in the tube. It may also be necessary to evenly mix the sample in the collection tube.

[0003] At present, the collection tube loading mechanism is often cumbersome to operate in order to facilitate the collection tube to be placed in the positioning slot at a suitable angle or with sufficient space, to be able to stably fix the collection tube and keep the collection tube in an upright state. Taking the utility model patent with authorization announcement number "CN217140483U" and patent name "A test tube loading device" as an example, after the test tube is loaded into the positioning slot 41 of the loading block 4, the limit block 3 is gently pushed upward, and the loading block 4 is pushed to the bottom of the limit plate 3 by flipping or sliding along the guide rail 7. The limit plate 3 is released, and the spring 32 under the limit plate 3 will pull the limit plate 3 back to its original position, and the tube cap of the test tube 6 will be stuck in the limit hole 31, so that the needle of the syringe can pass through the limit hole 31 vertically, go down to pierce the test tube cap and enter the vacuum test tube 6 to quickly extract the blood sample in the test tube 6. As can be seen from the above, the existing collection tube loading mechanism requires multiple operating steps to achieve all the above functions, and multiple components need to be manipulated to cooperate with each other. In addition, the positioning slots for fixing the collection tubes are not stable enough, and the limiting plates are also difficult to accurately keep the collection tubes in an upright state. The overall operation is not simple enough. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a collection tube loading mechanism that is easy to operate and can stably fix the collection tube and accurately maintain the collection tube in an upright state.

[0005] The collection tube loading mechanism according to an embodiment of the present invention comprises: a carrier; a flipping table, which is rotatably connected to the carrier via a first hinge axis, the flipping table being provided with a positioning groove, the positioning groove being capable of positioning and placing the collection tube, the groove wall of the positioning groove being provided with a side through-hole; an elastic unit, which is mounted on the carrier and located between the carrier and the flipping table, the side through-hole being provided for the elastic unit to pass through and enter the positioning groove; a rocker, which is rotatably connected to the carrier via a second hinge axis; an actuating handle, which is rotatably connected to the rocker via a third hinge axis, the actuating handle being rotatably connected to the flipping table via a fourth hinge axis, the carrier, the flipping table, the actuating handle and the rocker being connected in sequence A double rocker mechanism is formed, a locking rod is installed on the actuating handle, and a first stop portion is provided on the flipping platform that can stop the locking rod accordingly. The actuating handle can be manipulated to rotate so that the flipping platform drives the collection tube to rotate and causes the locking rod to approach or move away from the first stop portion; wherein, in the process of the locking rod gradually approaching the first stop portion, the flipping platform drives the collection tube to gradually rotate from an inclined state and first passes through an upright state and then reverses to an upright state, the elastic unit deforms and first stores deformation energy and then releases part of the deformation energy. When the collection tube is in the upright state, the elastic unit cooperates with the groove wall of the positioning groove to position and press the collection tube.

[0006] At least the following beneficial effects are achieved: the loading mechanism is very easy to operate. After the collection tube is positioned in the inclined positioning slot, it is only necessary to manipulate and rotate the actuating handle so that the locking rod gradually approaches the first stop portion, and the turning platform can drive the collection tube to rotate. Once the locking rod is stopped by the first stop portion, the elastic unit has a tendency to continue to release deformation energy, forcing the actuating handle to continue rotating in the original direction. However, since the locking rod is restrained by the first stop portion, the actuating handle cannot continue to rotate, and the various components maintain a relatively balanced and static state. Therefore, it is reasonable to set the opening of the positioning slot to be exactly upright at this time. At the same time, the elastic unit passes through the side through-hole and cooperates with the groove wall of the positioning slot to position and press the collection tube, stably fixing the collection tube in the positioning slot and keeping the relative position unchanged. Therefore, the collection tube can accurately maintain an upright state, unless it is manipulated by external force and the actuating handle is manipulated to rotate in the opposite direction, the locking rod gradually moves away from the first stop portion, and the collection tube is rotated to an inclined state for removal from the positioning slot.

[0007] According to some embodiments of the present invention, the flip table is provided with a second stop portion that can stop the locking rod. The locking rod can be manipulated back and forth between the first stop portion and the second stop portion. When the locking rod is stopped by the second stop portion, the angle at which the collection tube deviates from the upright state is the largest.

[0008] According to some embodiments of the present invention, the double rocker mechanism has one and only one extreme position. When the double rocker mechanism is in the extreme position, the fourth hinge axis is between the second hinge axis and the third hinge axis and the axes of the three are in the same plane. The deformation energy stored in the elastic unit is the largest, and the locking rod is located between the first stop portion and the second stop portion, and is closer to the first stop portion relative to the second stop portion.

[0009] According to some embodiments of the present invention, the elastic unit is a compression spring or a rubber strip.

[0010] According to some embodiments of the present invention, the elastic unit includes elastic pressure blocks and elastic preload members that are spaced apart. The side perforations allow the elastic pressure blocks to pass through and enter the positioning grooves. The elastic pressure blocks can cooperate with the groove walls of the positioning grooves to position and compress the collection tube. As the locking rod gradually approaches the first stop portion, the elastic preload member deforms and first stores deformation energy and then releases part of the deformation energy.

[0011] According to some embodiments of the present invention, the elastic preload is a compression spring, a spring guide groove is provided on the flip platform, one end of the elastic preload is accommodated in the spring guide groove and abuts against the bottom of the spring guide groove, and the other end of the elastic preload is fixedly connected to the carrier.

[0012] According to some embodiments of the present invention, the other end of the elastic preload is fastened to the carrier by a cylindrical head screw, a spiral groove is provided on the outer peripheral surface of the head of the cylindrical head screw, and the elastic preload is formed by spirally winding a metal wire, and the other end of the elastic preload is spirally engaged with the spiral groove.

[0013] According to some embodiments of the present invention, the elastic preload member includes an elastic deformation section and a connecting section connected in sequence along the axial direction. When the elastic preload member is in a natural state, the distance between two adjacent circles on the elastic deformation section is greater than the distance between two adjacent circles on the connecting section, and the connecting section is spirally matched with the spiral groove.

[0014] According to some embodiments of the present invention, the elastic pressing block is a rubber strip.

[0015] According to some embodiments of the present invention, two groups of the rocker arms and the actuating handles are provided, the two groups of the rocker arms are distributed on both sides of the flip table, the two groups of the actuating handles are distributed on both sides of the flip table, and the two groups of the actuating handles are connected by the locking rod.

[0016] According to some embodiments of the present invention, the first stopping portion is a receiving groove, and when stopping the locking rod, the first stopping portion can receive the locking rod.

[0017] According to some embodiments of the present invention, the turning platform is provided with a first manipulation avoidance hole at the bottom of the groove of the first stop portion.

[0018] According to some embodiments of the present invention, the turning platform is provided with a second manipulation avoidance hole near the second stop portion.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0021] Figure 1 Schematic diagram of the cooperation between the embodiment of the present invention and the syringe;

[0022] Figure 2 A side view of the embodiment of the present invention when the second stop portion stops the locking rod;

[0023] Figure 3 This is a structural diagram of the first embodiment of the present invention when the second stop portion stops the locking rod.

[0024] Figure 4 This is a structural diagram of the second embodiment of the present invention when the second stopping portion stops the locking rod;

[0025] Figure 5 This is a structural diagram of an embodiment of the present invention when the double rocker mechanism is in an extreme position;

[0026] Figure 6 A side view of an embodiment of the present invention when the first stop portion stops the locking rod;

[0027] Figure 7 This is a structural diagram of the second embodiment of the present invention when the first stopping portion stops the locking rod;

[0028] Figure 8 2. It is a schematic structural diagram of a carrier in a second embodiment of the present invention;

[0029] Figure 9 Schematic diagram of the cooperation between the elastic preload member and the cylindrical head screw in the second embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the structure of a cylindrical head screw in the second embodiment of the present invention;

[0031] Figure 11 Schematic diagram of the structure of the turning table in the second embodiment of the present invention.

[0032] Figure numbers: collection tube 1, carrier 2, turning table 3, positioning groove 31, side through hole 32, first stop part 33, second stop part 34, spring guide groove 35, first operating avoidance hole 36, second operating avoidance hole 37, actuating handle 4, rocker 5, elastic unit 6, elastic pressure block 61, elastic preloaded member 62, elastic deformation section 621, connecting section 622, locking rod 7, cylindrical head screw 8, head 81, screw 82, spiral groove 83, syringe 9, needle 91, tube plug 10, first hinge axis 11, second hinge axis 12, third hinge axis 13, fourth hinge axis 14. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as upright, tilted, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, if there is a description of first, second, third, and fourth, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figures 1 to 11 The present invention discloses a collection tube loading mechanism for loading a collection tube 1, comprising a carrier 2, a turning platform 3, an actuating handle 4 and a rocker 5.

[0038] Reference Figure 2 、 Figure 3 、 Figure 4 and Figure 7 The flipping platform 3 is rotatably connected to the carrier 2 through the first hinge shaft 11. The flipping platform 3 is provided with a positioning groove 31. The positioning groove 31 can be used to position the collection tube 1. The opening position of the collection tube 1 can be used to install a tube plug 10. The tube plug 10 can seal the sample in the collection tube 1.

[0039] Reference Figure 3 and Figure 4 An elastic unit 6 is installed on the carrier 2, and the elastic unit 6 is located between the carrier 2 and the flip table 3. The groove wall of the positioning groove 31 is provided with a side through-hole 32, and the side through-hole 32 is used for the elastic unit 6 to pass through and enter the positioning groove 31.

[0040] Reference Figure 2 、 Figure 5 and Figure 6 The rocker 5 is rotatably connected to the carrier 2 through the second hinge shaft 12, the actuating handle 4 is rotatably connected to the rocker 5 through the third hinge shaft 13, and the actuating handle 4 is rotatably connected to the flip table 3 through the fourth hinge shaft 14. Combined with the above-mentioned flip table 3 being rotatably connected to the carrier 2 through the first hinge shaft 11, the carrier 2, the flip table 3, the actuating handle 4 and the rocker 5 are connected in sequence to form a double rocker mechanism.

[0041] It should be noted that the carrier 2 is the frame in the double rocker mechanism, the flip platform 3 and the rocker 5 are the two rockers in the double rocker mechanism, and the actuating handle 4 is the connecting rod in the double rocker mechanism, wherein the actuating handle 4 is the driven active component.

[0042] In order to reasonably set the range of motion of the actuating handle 4, refer to Figure 6 and Figure 7 A locking rod 7 is mounted on the actuating handle 4, and a first stopper 33 is provided on the turning platform 3, which is capable of correspondingly stopping the locking rod 7. The actuating handle 4 can be manipulated and rotated to cause the turning platform 3 to rotate the collection tube 1 and move the locking rod 7 toward or away from the first stopper 33. It should be noted that while the locking rod 7 serves as the stopped portion of the actuating handle 4, it can also serve as the operating force application portion of the actuating handle 4.

[0043] Reference Figure 2 、 Figure 5 and Figure 6 In the process of the locking rod 7 gradually approaching the first stop portion 33, the turning table 3 drives the collection tube 1 to gradually rotate from the inclined state and first passes the upright state and then returns to the upright state. The elastic unit 6 deforms and first stores deformation energy and then releases part of the deformation energy. When the collection tube 1 is in the upright state, the elastic unit 6 cooperates with the groove wall of the positioning groove 31 to position and press the collection tube 1.

[0044] In order to facilitate the collection tube 1 to be placed into the positioning groove 31 at a suitable angle and with sufficient space, before loading, the opening of the positioning groove 31 on the turning table 3 is tilted. After the collection tube 1 is positioned and placed in the tilted positioning groove 31, it is only necessary to operate and rotate the actuating handle 4 so that the locking rod 7 gradually approaches the first stop portion 33, and the turning table 3 can drive the collection tube 1 to rotate. Once the locking rod 7 is stopped by the first stop portion 33, the elastic unit 6 has a tendency to continue to release deformation energy, forcing the actuating handle 4 to have a tendency to continue to rotate in the original direction. However, since the locking rod 7 is restrained by the first stop portion 33, the actuating handle 4 cannot continue to rotate, and the various components maintain a relatively balanced and static state. Therefore, it is reasonable to set the opening of the positioning groove 31 to be upright at this time. At the same time, the elastic unit 6 passes through the side through-hole 32 and cooperates with the groove wall of the positioning groove 31 to position and press the collection tube 1, stably fixing the collection tube 1 in the positioning groove 31 and keeping the relative position unchanged, so that the collection tube 1 can accurately maintain an upright state. Unless operated by external force, the actuating handle 4 is manipulated to rotate in the opposite direction, and the locking rod 7 gradually moves away from the first stop portion 33, rotating the collection tube 1 to a tilted state so as to be removed from the positioning groove 31.

[0045] The loading mechanism is very easy to operate. After loading the collection tube 1, refer to Figure 1 , the syringe 9 can move downward, causing the needle 91 to pierce the tube stopper 10 of the collection tube 1 and extract the sample in the collection tube 1. In addition, after the collection tube 1 is loaded, the sample in the collection tube 1 can be evenly mixed by connecting the carrier 2 to the mixing mechanism.

[0046] In some embodiments of the present invention, reference Figure 2 、 Figure 3 and Figure 4 The turning table 3 is provided with a second stop portion 34 that can correspond to the stopping locking rod 7. The locking rod 7 can be manipulated to move back and forth between the first stop portion 33 and the second stop portion 34. When the locking rod 7 is stopped by the second stop portion 34, the angle at which the collection tube 1 deviates from the upright state is the largest, while the turning table 3 is still under the pressure of the elastic unit 6, and the various components maintain a relatively balanced and static state.

[0047] Therefore, when the second stop portion 34 stops the locking rod 7, the position of the flip table 3 at this time can be designed as the loading position and unloading position of the positioning groove 31, and the collection tube 1 can be placed in the positioning groove 31 or taken out of the positioning groove 31.

[0048] Reference Figure 5The double rocker mechanism has one and only one extreme position. When the double rocker mechanism is in the extreme position, the fourth hinge axis 14 is between the second hinge axis 12 and the third hinge axis 13 and the axes of the three are located in the same plane. The deformation energy stored in the elastic unit 6 is maximum, and the locking rod 7 is located between the first stop portion 33 and the second stop portion 34, and is closer to the first stop portion 33 than the second stop portion 34.

[0049] It should be noted that the above-mentioned extreme positions are specifically for the double rocker mechanism, which is different from Figure 2 and Figure 6 The actuating handle 4 is shown in two extreme positions.

[0050] Reference Figure 3 In the first embodiment, the elastic unit 6 is specifically a rubber strip, which has reversible deformation and is elastic. Figure 5 and Figure 6 As shown, the elastic unit 6 can cooperate with the groove wall of the positioning groove 31 to firmly press the collection tube 1, and at the same time can deform when the carrier 2 is flipped and squeezed, and realize the changing process of first storing deformation energy and then releasing part of the deformation energy.

[0051] Reference Figure 4 、 Figure 7 、 Figure 8 and Figure 11 In the second embodiment, the elastic unit 6 includes an elastic pressure block 61 and an elastic preload member 62. The elastic pressure block 61 and the elastic preload member 62 are spaced apart. The side through-hole 32 allows the elastic pressure block 61 to pass through and enter the positioning groove 31. The elastic pressure block 61 can cooperate with the groove wall of the positioning groove 31 to position and press the collection tube 1. In the process of the locking rod 7 gradually approaching the first stop portion 33, the elastic preload member 62 is deformed and first stores deformation energy and then releases part of the deformation energy.

[0052] In other embodiments, the elastic unit 6 may also be a compression spring or other elastic structures.

[0053] In some embodiments, reference Figure 4 The elastic preload member 62 is a compression spring. During the rotation of the flip table 3 relative to the carrier 2, the angle between the two changes, and the compression spring can also bend slightly along the axial direction in accordance with the change of the angle. Figure 8 and Figure 11The flip table 3 is provided with a spring guide groove 35. One end of the elastic preload member 62 is received in the spring guide groove 35 and abuts against the bottom of the spring guide groove 35. The spring guide groove 35 constrains the elastic preload member 62 and prevents one end of the elastic preload member 62 from being released from the spring guide groove 35. The other end of the elastic preload member 62 is fixedly connected to the carrier 2. When assembling the loading mechanism, the other end of the elastic preload member 62 can be first fixed to the carrier 2. Then, the spring guide groove 35 of the flip table 3 is inserted over one end of the elastic preload member 62. Finally, the flip table 3 and the carrier 2 are assembled.

[0054] In other embodiments, the elastic preload member 62 may also be a torsion spring, which is mounted outside the first hinge shaft 11. One end of the torsion spring abuts the carrier 2, and the other end abuts the flip table 3, thereby applying an elastic preload force to the carrier 2 and the flip table 3. Furthermore, the elastic preload member 62 may also have other elastic structures.

[0055] Further references Figure 9 and Figure 10 In some embodiments, the other end of the elastic preload 62 is fastened to the carrier 2 by a cylindrical head screw 8. The cylindrical head screw 8 includes a head 81 and a screw 82. The screw 82 is used to fasten the carrier 2 through a thread. The end surface of the head 81 can be recessed to provide a slot, a cross slot or a hexagonal slot. Different from the traditional screw, the outer peripheral surface of the head 81 of the cylindrical head screw 8 is provided with a spiral groove 83. The elastic preload 62 is formed by spirally winding a metal wire. The other end of the elastic preload 62 is spirally matched with the spiral groove 83, thereby achieving the function of fixing the other end of the elastic preload 62 to the carrier 2, solving the problem that the end position of the traditional compression spring is difficult to fix.

[0056] In some embodiments, reference Figure 9 and Figure 10 Unlike traditional compression springs, the elastic preload member 62 includes an elastic deformation segment 621 and a connecting segment 622 connected in sequence along the axial direction. When the elastic preload member 62 is in a natural state, the distance between two adjacent circles on the elastic deformation segment 621 is greater than the distance between two adjacent circles on the connecting segment 622. The connecting segment 622 is spirally matched with the spiral groove 83. Even if the elastic deformation segment 621 frequently expands and contracts, the connecting segment 622 will not separate from the spiral groove 83. The connection is stable and the design is very clever.

[0057] Reference Figure 7 and Figure 8 The elastic pressing block 61 can be made of a rubber strip, which has reversible deformation and is elastic, so that the elastic pressing block 61 can cooperate with the groove wall of the positioning groove 31 to firmly press the collection tube 1, preventing the collection tube 1 from deviating or escaping from the positioning groove 31, even if the collection tube 1 is rotated to Figure 5Even in the extreme position shown, the elastic pressing block 61 will not crush the collecting tube 1.

[0058] Reference Figure 4 and Figure 7 The rocker 5 and the actuating handle 4 can be provided in two groups. The two groups of rockers 5 are distributed on both sides of the flip platform 3, and the two groups of actuating handles 4 are distributed on both sides of the flip platform 3, correspondingly forming two groups of double rocker mechanisms. The two groups of actuating handles 4 are connected by a locking rod 7 to enhance the flipping stability of the flip platform 3.

[0059] Due to the locking rod 7 being in a good middle position, the locking rod 7 is designed as the operating force application part of the actuating handle 4, which is very conducive to operation.

[0060] Reference Figure 7 The first stop portion 33 can specifically be a receiving groove. When the locking rod 7 is stopped, the first stop portion 33 can receive the locking rod 7. By visually enhancing the effect, it suggests to the user that the locking rod 7 has not reached or has reached the stop position, and it has the aesthetic effect of hidden storage.

[0061] In some embodiments of the present invention, reference Figure 7 The turning platform 3 is provided with a first operation avoidance hole 36 at the bottom of the groove of the first stopper 33. The first operation avoidance hole 36 faces the middle position of the locking rod 7, which can just avoid the user's hand holding the locking rod 7 and will not be pinched. Figure 4 and Figure 11 The turning table 3 can have a second operation avoidance hole 37 near the second stop portion 34. The second operation avoidance hole 37 is toward the middle position of the locking rod 7, which can just avoid the user's hand holding the locking rod 7 without pinching the hand.

[0062] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Collection tube loading mechanism, characterized in that: include: carrier; A turning platform is rotatably connected to the carrier via a first hinge shaft, the turning platform is provided with a positioning groove, the positioning groove can be used to position the collection tube, and the groove wall of the positioning groove is provided with a side through hole; An elastic unit is mounted on the carrier and located between the carrier and the flip platform, and the side through-hole allows the elastic unit to pass through and enter the positioning groove; A rocker, rotatably connected to the carrier via a second hinge shaft; An actuating handle is rotatably connected to the rocker via a third hinge shaft, and the actuating handle is rotatably connected to the flip table via a fourth hinge shaft. The carrier, the flip table, the actuating handle, and the rocker are sequentially connected to form a double rocker mechanism. A locking rod is mounted on the actuating handle, and a first stopper is provided on the flip table that can correspondingly stop the locking rod. The actuating handle can be manipulated to rotate so that the flip table drives the collection tube to rotate and the locking rod moves closer to or away from the first stopper. In which, two groups of rockers and actuating handles are provided, the two groups of rockers are distributed on both sides of the flip platform, and the two groups of actuating handles are distributed on both sides of the flip platform. The two groups of actuating handles are connected by the locking rod. In the process of the locking rod gradually approaching the first stop portion, the flip platform drives the collection tube to gradually rotate from the inclined state and first pass through the upright state and then return to the upright state. The elastic unit is deformed and first stores deformation energy and then releases part of the deformation energy. When the collection tube is in the upright state, the elastic unit cooperates with the groove wall of the positioning groove to position and press the collection tube.

2. The collection tube loading mechanism according to claim 1, characterized in that: The flip table is provided with a second stop portion that can stop the locking rod. The locking rod can be manipulated back and forth between the first stop portion and the second stop portion. When the locking rod is stopped by the second stop portion, the angle at which the collection tube deviates from the upright state is the largest.

3. The collection tube loading mechanism according to claim 2, characterized in that: The double rocker mechanism has one and only one extreme position. When the double rocker mechanism is in the extreme position, the fourth hinge axis is between the second hinge axis and the third hinge axis and the axes of the three are in the same plane. The deformation energy stored in the elastic unit is maximum, and the locking rod is located between the first stop portion and the second stop portion, and is closer to the first stop portion relative to the second stop portion.

4. The collection tube loading mechanism according to claim 1 or 3, characterized in that: The elastic unit is a compression spring or a rubber strip.

5. The collection tube loading mechanism according to claim 1 or 3, characterized in that: The elastic unit includes elastic pressure blocks and elastic pre-tightening members distributed at intervals. The side through-holes allow the elastic pressure blocks to pass through and enter the positioning grooves. The elastic pressure blocks can cooperate with the groove walls of the positioning grooves to position and press the collection tube. In the process of the locking rod gradually approaching the first stop portion, the elastic pre-tightening member deforms and first stores deformation energy and then releases part of the deformation energy.

6. The collection tube loading mechanism according to claim 5, characterized in that: The elastic preload member is a compression spring, a spring guide groove is provided on the flip platform, one end of the elastic preload member is accommodated in the spring guide groove and abuts against the bottom of the spring guide groove, and the other end of the elastic preload member is fixedly connected to the carrier.

7. The collection tube loading mechanism according to claim 6, characterized in that: The other end of the elastic preload is fastened to the carrier by a cylindrical head screw, the outer peripheral surface of the head of the cylindrical head screw is provided with a spiral groove, the elastic preload is formed by spirally winding a metal wire, and the other end of the elastic preload is spirally engaged with the spiral groove.

8. The collection tube loading mechanism according to claim 7, characterized in that: The elastic preload member includes an elastic deformation section and a connecting section connected in sequence along the axial direction. When the elastic preload member is in a natural state, the distance between two adjacent circles on the elastic deformation section is greater than the distance between two adjacent circles on the connecting section, and the connecting section is spirally matched with the spiral groove.

9. The collection tube loading mechanism according to claim 5, characterized in that: The elastic pressing block is a rubber strip.

10. The collection tube loading mechanism according to claim 1, characterized in that: The first stop portion is a receiving groove, and when stopping the locking rod, the first stop portion can receive the locking rod.

11. The collection tube loading mechanism according to claim 10, characterized in that: The turning platform is provided with a first operating avoidance hole at the bottom of the groove of the first stop portion.

12. The collection tube loading mechanism according to claim 2, characterized in that: The turning platform is provided with a second operation avoidance hole at a position close to the second stop portion.

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