Butyl rubber plug for disposable vacuum blood sampling tube and mounting method thereof

Abstract

The invention provides a butyl rubber plug for a disposable vacuum blood collection tube and an installation method of the butyl rubber plug, and belongs to the technical field of vacuum blood collection tubes.The butyl rubber plug comprises a plug body used for being plugged into the vacuum blood collection tube.The plug body is internally provided with at least one air suction hole penetrating through the upper end face and the lower end face of the plug body; the end, located in the vacuum blood collection tube, of the plug body is connected with a sliding plug made of butyl rubber in a close fit mode, and the sliding plug can plug the position, close to the tube opening, of the vacuum blood collection tube to achieve sealing. The plug further comprises a plugging piece in socket fit with the plug body, a plug rod in socket fit with the air suction hole is arranged on the bottom end face of the plugging piece, and when the plug rod is inserted to the bottom to plug the air suction hole, the bottom end face of the plugging piece is tightly attached to the top end face of the plug body. The butyl rubber plug can be rapidly installed on the vacuum blood collection tube, and rapid installation is facilitated on the premise that the sealing performance is quite excellent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum blood collection tube, more particularly to a butyl rubber plug for disposable vacuum blood collection tube and a mounting method thereof. BACKGROUND

[0002] The vacuum blood collection tube is a one-time, quantitatively blood-collecting negative pressure vacuum glass tube, which needs to be used with a venous blood collection needle. Figure 1 As shown in the figure, a rubber plug is embedded and mounted at the tube opening of the vacuum blood collection tube. The rubber plug is a butyl rubber plug after 2004. The butyl rubber plug is an elastomer made of butyl rubber, which has excellent air tightness, heat resistance, aging resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption, and low water absorption. The rubber plug is widely used in the medical field, especially in the vacuum blood collection tube. The current rubber plug in the disposable vacuum blood collection tube is a stepped cylindrical plug. The existing butyl rubber plug for vacuum blood collection tube is actually not substantially different from the ordinary rubber plug in structure. It mainly relies on the elastic extrusion force between the butyl rubber plug and the tube wall to seal. When installing, in order to improve the sealing performance as much as possible, the butyl rubber plug must be made as large as possible, so that it can be better sealed after being inserted into the vacuum blood collection tube. However, it is difficult to install the butyl rubber plug into the vacuum blood collection tube, and therefore, the sealing performance of the butyl rubber plug in the current vacuum blood collection tube still needs to be improved, otherwise it is difficult to maintain the negative pressure environment of the vacuum blood collection tube for a long time. SUMMARY

[0003] The present application provides a butyl rubber plug for disposable vacuum blood collection tube and a mounting method thereof to solve the problem that the convenience and sealing performance of the butyl rubber plug cannot be considered simultaneously when the butyl rubber plug is installed in the vacuum blood collection tube in the prior art.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a butyl rubber plug for disposable vacuum blood collection tube, comprising a plug body for being inserted into the vacuum blood collection tube, the inside of the plug body having at least one air suction hole penetrating through the upper and lower end faces, and a sliding plug made of butyl rubber being tightly connected to one end of the plug body in the vacuum blood collection tube, the sliding plug being capable of sealing the tube opening of the vacuum blood collection tube to achieve sealing; further comprising a blocking member in socket joint with the plug body, the bottom end face of the blocking member having a plug rod in socket joint with the air suction hole, and when the plug rod is inserted to the bottom to block the air suction hole, the bottom end face of the blocking member is tightly attached to the top end face of the plug body.

[0005] Preferably, a plurality of said air suction holes are arranged in a ring array in the plug body, each of which penetrates the plug body from top to bottom in parallel to the axis of the plug body; a tapered positioning groove is further arranged on the top end surface of the plug body, and the bottom end of the sealing member has a tapered protrusion, when the protrusion is engaged with the positioning groove, all the plug rods can be inserted into the corresponding air suction holes.

[0006] Preferably, the sliding plug comprises a cylindrical part and a disc part, the disc part is coaxially arranged in the center of the cylindrical part and integrally formed with the cylindrical part, so that the longitudinal section of the sliding plug is in the shape of an I-beam; the side wall of the bottom end of the plug body has a ring-shaped step, when the vacuum blood collection tube is vacuumized through the air suction hole, the sliding plug moves upward, and the upper half of the cylindrical part is embedded into the ring-shaped insertion slot formed by the ring-shaped step and the inner wall of the vacuum blood collection tube.

[0007] Preferably, the bottom end of the plug body has a recess, so that when the sliding plug is embedded and fixed on the bottom end surface of the plug body, only the bottom end surface of the plug body around the ring-shaped step is in contact, and the bottom end of the plug rod is not in contact with the disc part.

[0008] Preferably, the cylindrical surface of the ring-shaped step is provided with an inverted bevel, or the side wall of the ring-shaped insertion slot is a conical surface; When the side wall of the ring-shaped insertion slot is a conical surface, the large end of the conical surface faces downward, the inner wall of the upper half of the cylindrical part is also a conical surface, and the large end of the conical surface faces upward, so that when the sliding plug is embedded and fixed in the ring-shaped insertion slot, a part of the two conical surfaces are coaxial with each other, the top end of the cylindrical part is not in contact with the bottom of the ring-shaped insertion slot, and the end surface of the ring-shaped insertion slot is not in contact with the disc part.

[0009] Preferably, the hardness of the plug rod is stronger than that of the plug body; the top side edge of the plug body extends horizontally in the radial direction of the vacuum blood collection tube, then extends vertically downward to form an outer wrapping ring, so that the tube wall of the vacuum blood collection tube is clamped between the plug body and the outer wrapping ring in the vacuum blood collection tube, and an arc-shaped rounded corner is formed at the inner right angle between the radially horizontally extended part of the plug body and the outer wrapping ring.

[0010] Meanwhile, the application also discloses a mounting method of the butyl rubber plug for the vacuum blood collection tube, which comprises the following steps: S1. vertically placing and fixing the vacuum blood collection tube; S2. coaxially placing the sliding plug in the vacuum blood collection tube; S3. axially pressing the plug body into the tube opening of the vacuum blood collection tube; S4. pressing the top end of the plug body with a vacuum suction tube, sucking out the air in the vacuum blood collection tube through the air suction hole, and vertically moving the sliding plug upward to be embedded and fixed on the bottom end of the plug body. S5. Moving the stopper to the top of the plug body and vertically downward until all the plug rods are completely inserted into the air inlet hole of the plug body.

[0011] Specifically, step S5 is carried out in a vacuum environment, so that after the plug rods are completely inserted into the air inlet hole, the sliding plug is fixed together with the bottom end face of the plug body only through plane contact.

[0012] Specifically, a pair of oppositely arranged clamps with semicircular recesses are used to clamp the vacuum blood collection tube, the pair of clamps are simultaneously threadedly fitted on a threaded rod, the threaded rod is driven by a motor to rotate around its axis, and the two clamps are simultaneously penetrated by a guide rod, the guide rod is parallel to the threaded rod, and a cylindrical gear is fixed on the threaded rod between the two clamps, the cylindrical gear is engaged with a rack arranged parallel to the axis of the plug body. When the motor is driven, the two clamps first gradually approach the vacuum blood collection tube radially, and at the same time, the rack drives the plug body connected to a mechanical claw at the top end to move vertically downward, when the two clamps clamp the vacuum blood collection tube, the two clamps have slid out of the corresponding threaded segments on the threaded rod, and when the threaded rod continues to rotate, the clamps do not move with the threaded rod, but the rack still moves downward, thereby fixing the plug body on the vacuum blood collection tube.

[0013] Further, when a butyl rubber plug for the next vacuum blood collection tube needs to be installed, the clamps are retracted onto the corresponding threaded segments by the tension of the reset tension spring connected to the clamps and the reverse rotation of the threaded rod, so that the next vacuum blood collection tube can be clamped gradually by the positive rotation of the clamps again.

[0014] Compared with the prior art, the butyl rubber plug in the application is provided with an air inlet hole, which can make the inside of the plug body partially hollow, thereby facilitating rapid insertion and installation, and then the air inlet hole is filled by the installation of the plug rod, so that the plug body in the blood collection tube expands, thereby further firmly installing the plug body in the vacuum blood collection tube. On the other hand, when the vacuum blood collection tube is vacuumized in a vacuum environment, the air inlet hole will make the sliding plug move upward and cover the bottom end of the plug body, and the sliding plug will be in extrusion contact with the plug body and the wall of the vacuum blood collection tube, thereby further sealing the vacuum blood collection tube below the plug body. Under the double sealing structure, the sealing performance of the butyl rubber plug is improved. In addition, since the sliding plug is mainly installed by vacuumization, when the sealing member is installed in a vacuum environment, it is also determined whether the vacuum blood collection tube is poorly sealed and whether it meets the vacuum requirement by whether the sliding plug falls.

[0015] Other advantages, objects, and features of the application will be apparent from the following description, and will be understood by those skilled in the art upon reading and understanding the specification. Attached Figure Description

[0016] Figure 1 A schematic diagram of an existing butyl rubber stopper installed on a vacuum blood collection tube; Figure 2 This is a schematic diagram of one structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the plug body in the middle; Figure 4 This is a top view of the plug. Figure 5 This is another structural schematic diagram of the present invention; Figures 6-7 for Figure 2 Enlarged view of the two implementation structures within the elliptical region; Figure 8 This is a top view of the device for installing butyl rubber stoppers for disposable vacuum blood collection tubes according to the present invention; Figure 9 This is a schematic diagram of a rack-driven piston.

[0017] The components to be packaged include: 1. Vacuum blood collection tube; 2. Plug; 3. Sliding plug; 301. Cylindrical part; 302. Disc part; 4. Sealing part; 5. Plug rod; 6. Protrusion; 7. Suction hole; 8. Positioning groove; 9. Outer ring; 10. Rounded corner; 11. Annular slot; 12. Bevel; 13. Stud; 14. Clamp; 15. Cylindrical gear; 16. Rack; 17. Reset spring; and 18. Mechanical claw. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments: like Figures 2-3As shown, one of the embodiments of the present application illustrates a butyl rubber plug for disposable vacuum blood collection tube. In terms of structure, it specifically comprises a plug body 2 for plugging into the vacuum blood collection tube 1 to be packaged. The plug body 2 can be generally cylindrical. The inside of the plug body 2 has at least one air suction hole 7 penetrating through the upper and lower end faces. The air suction hole 7 can be a circular hole. The plug body 2 at one end in the vacuum blood collection tube is tightly connected with a sliding plug 3 made of butyl rubber. The sliding plug 3 can block the vacuum blood collection tube at the tube opening, thereby realizing sealing below the plug body 2. In specific manufacturing, the embodiment also has a blocking piece 4 in engagement with the plug body 2. The bottom end face of the blocking piece 4 has a plug rod 5 in engagement with the air suction hole 7. The plug rod 5 can be arranged in an annular array. When the plug rod 5 is inserted into the air suction hole 7 to the bottom, that is, completely inserted, the air suction hole 7 can be completely blocked. The bottom end face of the blocking piece 4 is tightly attached to the top end face of the plug body 2, so as to block the bottom end of the air suction hole 7 and prevent leakage.

[0019] As one of the specific implementation structures, as Figures 3-4 , the plug body 2 has a plurality of air suction holes 7 arranged in an annular array. Each air suction hole 7 is parallel to the axis of the plug body 2 and vertically penetrates through the upper and lower end faces of the plug body 2. A tapered positioning groove 8 is arranged on the top end face of the plug body 2. The positioning groove 8 is tapered from large at the top to small at the bottom for positioning. The bottom center of the blocking piece 4 has a tapered protrusion 6 correspondingly. The protrusion 6 is also tapered. When the protrusion 6 is engaged with the positioning groove 8, all the plug rods 5 can be inserted into the corresponding air suction holes 7, thereby sealing and filling the air suction holes 7.

[0020] Continuing to refer to Figure 2 , the sliding plug 3 in the embodiment comprises a cylindrical part 301 and a disc part 302. The disc part 302 is coaxially located in the center of the cylindrical part 301 and is preferably integrally formed with the cylindrical part 301, so that the longitudinal section of the sliding plug 3 is in the shape of an I-beam. Meanwhile, the sidewall of the plug body 2 at the bottom end has an annular step. When the vacuum blood collection tube is vacuumized through the air suction hole 7, the sliding plug 3 will move upward due to the suction force, so that the upper half of the cylindrical part 301 is embedded into an annular slot 11 formed by the annular step and the inner wall of the vacuum blood collection tube, thereby realizing engagement and fixation. In order to make the sliding plug 3 play a good sealing role and minimize the sealing contact area for easy processing, as Figure 5 , a recess is specially arranged at the bottom center of the plug body 2. When the sliding plug 3 is embedded and fixed on the bottom end face of the plug body 2, only the bottom end face of the plug body 2 around the annular step is in contact, and the bottom end of the plug rod 5 does not contact the disc part 302. Avoiding that the plug rod 5 lifts the disc part 302 or the area of the plug body 2 end face is too large and the flatness precision is insufficient, which causes the disc part 302 to not cover and seal well.

[0021] For the convenience of the socket joint, as shown in Figure 6 A reverse bevel 12 is arranged on the cylindrical surface of the annular step. Alternatively, the following structure is used: as shown in Figure 7 The side wall of the annular slot 11 is processed into a conical surface. When the side wall of the annular slot 11 is a conical surface, the large end of the conical surface faces downward, the upper half of the inner wall of the cylindrical part 301 is also a conical surface, and the large end of the conical surface faces upward. When the sliding plug 3 is fixedly embedded in the annular slot 11, a part of the two conical surfaces coincide with each other coaxially to form a sealing joint, and the top end of the cylindrical part 301 does not contact the bottom of the annular slot 11, and the end surface of the annular slot 11 does not contact the disc part 302, thereby ensuring that the two conical surfaces are in sufficient contact and sealing, and avoiding the difficulty of the sliding plug 3 being tightly wedged in the annular slot 11 under the action of strong suction, which affects the sealing performance.

[0022] Finally, the hardness of the plug rod 5 in this embodiment is stronger than that of the plug body 2, which is convenient for socket joint and rapid filling and sealing of the air suction hole 7. The sliding plug 3 in the present application can already play a considerable sealing role, and is directly in contact with the liquid medicine. Therefore, the plug rod 5 and even the plug body 2 do not have to use butyl rubber, or do not have to be subjected to film optimization treatment like traditional butyl rubber plugs. As shown in Figure 3 The top side edge part of the plug body 2 extends horizontally in the radial direction of the vacuum blood collection tube, and then extends vertically downward to form an outer wrapping ring 9, so that the tube wall of the vacuum blood collection tube is clamped between the plug body 2 and the outer wrapping ring 9 in the vacuum blood collection tube. An arc-shaped rounded corner 10 is arranged at the inner right angle between the plug body 2 and the outer wrapping ring 9, so as to facilitate the rapid installation of the outer wrapping ring 9 on the vacuum blood collection tube, and facilitate the outward turning of the outer wrapping ring 9 to conveniently pull out the plug body 2 when necessary.

[0023] As another embodiment, a method for installing a butyl rubber plug for a vacuum blood collection tube is also particularly proposed. The method comprises the following steps: first, vertically placing the vacuum blood collection tube to fix it, coaxially placing the sliding plug 3 in the vacuum blood collection tube, axially pressing the plug body 2 into the tube opening of the vacuum blood collection tube, pressing and connecting the vacuum suction tube of the vacuum suction device to the top end of the plug body 2, sucking out the air in the vacuum blood collection tube through the air suction hole 7, vertically moving the sliding plug 3 upward, and then embedding and fixing the sliding plug 3 at the bottom end of the plug body 2. Finally, move the blocking piece 4 to the upper side of the plug body 2, and then vertically move it downward, and then insert all the plug rods 5 into the air suction hole 7 of the plug body 2, seal the air suction hole 7, and perform multiple sealing on the vacuum blood collection tube.

[0024] It is particularly pointed out that, in practice, the process of installing the sealing member 4 is preferably carried out in a vacuum environment, so that after the vacuum is drawn in the vacuum blood collection tube, the plug rod 5 is inserted immediately, so that the sliding plug 3 still maintains the state of being attracted upward and is attached to the bottom end of the plug body 2, that is, after the plug rod 5 is completely inserted into the air inlet hole 7, the sliding plug 3 is directly fixed with the bottom end surface of the plug body 2 through only plane contact, so that it is not only more convenient to fix the sliding plug 3, but also the structure is simpler, and most importantly, it also plays a clever role, that is, it reflects whether the vacuum blood collection tube is in a vacuum state, because once the vacuum blood collection tube is not in a vacuum state, the sliding plug 3 will automatically fall down and be separated from the plug body 2, so as long as it is found in use that the sliding plug 3 in a certain vacuum blood collection tube has fallen down, it means that the vacuum blood collection tube has been non-vacuum, and it may have been contaminated by external air and cannot be used.

[0025] In order to realize the rapid installation of the butyl rubber plug for the disposable vacuum blood collection tube, as shown in Figures 8-9 the embodiment recommends using a pair of oppositely arranged clamps 14 with semicircular recesses to clamp the vacuum blood collection tube, and the pair of clamps 14 are simultaneously threadedly mounted on a threaded rod 13, the threaded rod 13 is driven by a motor and can rotate around its own axis, at the same time, the two clamps 14 are simultaneously penetrated by a guide rod, the guide rod is fixedly installed and parallel to the threaded rod 13, in addition, a cylindrical gear 15 is fixed on the threaded rod 13 between the two clamps 14, the cylindrical gear 15 is engaged with a rack 16 arranged parallel to the axis of the plug body 2, forming a transmission chain of a lead screw pair and a gear and rack 16 pair. When the motor is driven, the two clamps 14 first gradually move radially towards the vacuum blood collection tube, and at the same time, the rack 16 drives the plug body 2 connected at its top end by a mechanical claw 18 to move vertically downward, when the two clamps 14 clamp the vacuum blood collection tube, the two clamps 14 have already slid out of the corresponding threaded segments on the threaded rod 13. When the threaded rod 13 continues to rotate, the clamps 14 do not move with the threaded rod 13 because the clamps 14 have already moved to the smooth rod segment of the threaded rod 13, but the cylindrical gear 15 continues to rotate with the threaded rod 13, the rack 16 still moves downward, thereby driving the plug body 2 to move downward, and finally fixing the plug body 2 on the vacuum blood collection tube. As an optimized supplementary design structure, in the embodiment, when the next butyl rubber plug for the vacuum blood collection tube needs to be installed, the tension of the return tension spring 17 connected to the clamp 14 and the reverse rotation of the threaded rod 13 work together to make the clamp 14 retreat to the corresponding threaded segment, and during the reverse rotation, the clamp 14 is in contact with the end of the threaded segment due to the tension of the return tension spring 17, and is re-screwed onto the threaded rod 13 as the reverse rotation proceeds, so that the next vacuum blood collection tube can be gradually clamped by the positive rotation again, which is very ingenious. Moreover, the installation of the above-mentioned butyl rubber plug in the embodiment is also applicable to the installation of all rubber plugs matched with containers.

[0026] Finally, it is to be explained that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A butyl rubber stopper for disposable vacuum blood collection tubes, comprising a stopper body (2) for insertion into vacuum blood collection tubes, characterized in that: The plug body (2) has at least one air intake hole (7) that runs through its upper and lower ends. The end of the plug body (2) located inside the vacuum blood collection tube is tightly connected to a sliding plug (3) made of butyl rubber. The sliding plug (3) can seal the vacuum blood collection tube by blocking its opening. It also includes a sealing member (4) that is inserted into the plug body (2). The bottom end of the sealing member (4) has a plug rod (5) that is inserted into the air intake hole (7). When the plug rod (5) is inserted to the bottom and blocks the air intake hole (7), the bottom end of the sealing member (4) is tightly attached to the top end of the plug body (2).

2. The butyl rubber stopper for disposable vacuum blood collection tubes as described in claim 1, characterized in that: The plug body (2) has a number of air intake holes (7) arranged in a ring array inside. Each air intake hole (7) passes through the upper and lower ends of the plug body (2) parallel to the axis of the plug body (2). A conical positioning groove (8) is also provided on the top surface of the plug body (2). The bottom center of the sealing member (4) has a conical protrusion (6). When the protrusion (6) fits into the positioning groove (8), all the plug rods (5) can be inserted into the corresponding air intake holes (7).

3. The butyl rubber stopper for disposable vacuum blood collection tubes as described in claim 1, characterized in that: The sliding plug (3) includes a cylindrical part (301) and a disc part (302). The disc part (302) is coaxially located in the center of the cylindrical part (301) and integrally formed with it, so that the longitudinal section of the sliding plug (3) is I-shaped. The plug body (2) has an annular step on the side wall near the bottom. When the vacuum blood collection tube is evacuated through the suction hole (7), the sliding plug (3) moves upward, so that the upper part of the cylindrical part (301) is precisely embedded in the annular slot (11) formed by the annular step and the inner wall of the vacuum blood collection tube.

4. The butyl rubber stopper for disposable vacuum blood collection tubes as described in claim 3, characterized in that: The bottom center of the plug (2) has a recess, so that when the sliding plug (3) is embedded and fixed on the bottom surface of the plug (2), it only contacts the bottom surface of the plug (2) around the annular step, and the bottom end of the plug rod (5) does not contact the disc portion (302).

5. The butyl rubber stopper for disposable vacuum blood collection tubes as described in claim 3, characterized in that: The cylindrical surface of the annular step is provided with a chamfer (12), or the sidewall of the annular slot (11) is a conical surface; When the sidewall of the annular slot (11) is a conical surface, the large end of the conical surface faces downwards. The inner wall of the upper half of the cylindrical part (301) is also a conical surface, and the large end of the conical surface faces upwards. This is so that when the sliding plug (3) is embedded and fixed in the annular slot (11), a portion of the two conical surfaces are coaxially overlapped with each other, and the top of the cylindrical part (301) does not contact the bottom of the annular slot (11), and the end face of the annular slot (11) does not contact the disc part (302).

6. The butyl rubber stopper for disposable vacuum blood collection tubes as described in claim 1, characterized in that: The hardness of the plug rod (5) is greater than that of the plug body (2); the top side portion of the plug body (2) extends horizontally toward the vacuum blood collection tube in the radial direction, and then extends vertically downward to form an outer ring (9), so that the tube wall of the vacuum blood collection tube is sandwiched between the plug body (2) and the outer ring (9) located inside the vacuum blood collection tube, and a rounded corner (10) of a superior arc shape is formed at the inner right angle between the horizontally extending portion of the plug body (2) and the outer ring (9).

7. A method for installing a butyl rubber stopper for a vacuum blood collection tube, characterized in that, Includes the following steps: S1. The vacuum blood collection tube is placed vertically and fixed in place; S2. Place the sliding plug (3) coaxially inside the vacuum blood collection tube; S3. The butyl rubber stopper for the disposable vacuum blood collection tube as described in any one of claims 1-6 is axially pressed into the opening of the vacuum blood collection tube; S4. Use a vacuum suction tube to squeeze the top of the plug (2) and suck out the air in the vacuum blood collection tube through the suction hole (7), while the sliding plug (3) moves vertically upward and is embedded and fixed at the bottom of the plug (2). S5. Move the sealing member (4) directly above the plug body (2) and move it vertically downwards until all the plug rods (5) are fully inserted into the air intake hole (7) of the plug body (2).

8. The method for installing a butyl rubber stopper for a vacuum blood collection tube as described in claim 7, characterized in that, Step S5 is performed in a vacuum environment, so that after the plug rod (5) is fully inserted into the air intake hole (7), the sliding plug (3) can be fixed together with the bottom end face of the plug body (2) by simply contacting the plane.

9. The method for installing a butyl rubber stopper for a vacuum blood collection tube as described in claim 7, characterized in that, The vacuum blood collection tube is clamped by a pair of opposing clamps (14) with semi-circular recesses. The pair of clamps (14) are threadedly mounted on a stud (13). The stud (13) is driven by a motor and can rotate around its own axis. At the same time, the two clamps (14) are simultaneously penetrated by a guide rod, which is parallel to the stud (13). A cylindrical gear (15) is fixed on the stud (13) between the two clamps (14). The cylindrical gear (15) meshes with a rack (16) that is parallel to the axis of the plug body (2). When the motor drives, the two clamps (14) gradually move towards the vacuum blood collection tube radially. At the same time, the rack (16) drives the mechanical claw (18) connected to its top to grip the plug (2) vertically downward. When the two clamps (14) tighten the vacuum blood collection tube, the two clamps (14) have slid out of the corresponding threaded section on the stud (13). When the stud (13) continues to rotate, the clamps (14) no longer move with the rotation of the stud (13), but the rack (16) still moves downward, thereby fixing the plug (2) on the vacuum blood collection tube.

10. The method for installing a butyl rubber stopper for a vacuum blood collection tube as described in claim 9, characterized in that, When the next vacuum blood collection tube butyl rubber plug needs to be installed, the tension of the reset spring (17) connected to the clamp (14) and the reversing action of the stud (13) together cause the clamp (14) to retract to its corresponding threaded section so that the next vacuum blood collection tube can be gradually clamped when the tube is rotated forward again.

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