Axially preloaded seal mechanism and centrifuge

Abstract

The utility model relates to centrifuge technical field especially relates to a kind of sealing mechanism and centrifuge of axial pre-tightening, axial pre-tightening sealing mechanism includes hollow spindle;Outer drum, the first end coaxial line fixed setting of outer drum is located in the first end of hollow spindle, and outer drum has accommodating cavity;Push rod, push rod sliding is set in hollow spindle, and push rod is rotationally connected with hollow spindle, and the both ends of push rod protrude relative to hollow spindle;Inner drum, inner drum is located in accommodating cavity, and the first end of inner drum is coaxial line fixed setting with push rod and the first end of outer drum is close, and the second end of inner drum blocks the opening of accommodating cavity;Filter bag, one end of filter bag is connected with the second end of outer drum, and the other end of filter bag is connected with the first end of inner drum;Pre-tightening structure, pre-tightening structure is transmission connection with push rod.The utility model can guarantee effective sealing between inner drum and outer drum, prevent the appearance seepage, to avoid the waste of centrifugal material.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge technology, and in particular to an axially pre-tightened sealing mechanism and a centrifuge. Background Technology

[0002] Centrifuges are laboratory and industrial devices that use centrifugal force to separate solids from liquids or liquids from liquids. They are widely used in scientific research, medicine, chemical engineering, food processing, and other fields. Their core principle is to generate centrifugal force through high-speed rotation to separate components of different densities in a mixture, offering high efficiency and precision.

[0003] In a centrifuge, the filter bag is positioned between the inner and outer drums, with the end face of the inner drum sealing the end face of the outer drum. However, during long-term operation of the centrifuge, leakage can easily occur at the seal between the inner and outer drums, leading to waste of centrifuged material.

[0004] Therefore, an axially pre-tightened sealing mechanism and a centrifuge are needed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an axially pre-tightened sealing mechanism and centrifuge, which can ensure an effective seal between the inner and outer drums, prevent leakage, and thus avoid waste of centrifugal materials.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An axially pre-tightened sealing mechanism includes:

[0008] Hollow spindle;

[0009] An outer drum, the first end of which is coaxially fixedly disposed at the first end of the hollow main shaft, and the outer drum having a receiving cavity;

[0010] A push rod, which slides through the hollow main shaft and is anti-rotationally connected to the hollow main shaft, with both ends of the push rod extending out relative to the hollow main shaft;

[0011] An inner drum is located in the receiving cavity, and the first end of the inner drum is fixedly arranged coaxially with the first end of the push rod near the outer drum. The second end of the inner drum blocks the opening of the receiving cavity.

[0012] A filter bag, one end of which is connected to the second end of the outer drum, and the other end of which is connected to the first end of the inner drum;

[0013] A pre-tightening structure is provided, which is connected to the push rod in a transmission manner. The pre-tightening structure can drive the push rod so that the second end of the inner drum and the second end of the outer drum are sealed and abutted together.

[0014] In some embodiments, the inner drum includes a fixed plate and an end sealing plate, the fixed plate and the end sealing plate being arranged parallel to each other along the axial direction of the hollow main shaft, the fixed plate being connected to the end sealing plate via a connecting rod, the fixed plate being connected to the first end of the push rod, and the end sealing plate being used to seal the opening of the receiving cavity.

[0015] In some embodiments, a first mounting groove is formed on the circumferential surface of the end sealing plate along the circumferential direction, a first sealing ring is embedded in the first mounting groove, and the first sealing ring protrudes relative to the first mounting groove, and the first sealing ring can abut against the inner wall surface of the outer drum.

[0016] In some embodiments, the end sealing plate has an abutment portion, and the abutment portion has a second mounting groove on the side facing the outer drum. A second sealing ring is embedded in the second mounting groove, and the second sealing ring protrudes relative to the second mounting groove. The second sealing ring can abut against the second end face of the outer drum.

[0017] In some embodiments, the preload structure includes a first drive assembly, a transmission assembly, and an elastic preload assembly. The transmission assembly is disposed at the second end of the push rod. The first drive assembly is drively connected to the transmission assembly so that the transmission assembly drives the push rod to move relative to the hollow main shaft, thereby sealingly abutting the second end of the inner drum with the second end of the outer drum. The elastic preload assembly is disposed on the transmission assembly and has a tendency to cause the push rod to seally abut the second end of the inner drum with the second end of the outer drum.

[0018] In some embodiments, the transmission assembly includes a lead screw and a main nut, one end of the lead screw is coaxially inserted into the push rod, the main nut is coaxially fixedly disposed at the second end of the push rod, and the main nut is threadedly connected to the lead screw, and the first drive assembly is drivenly connected to the lead screw.

[0019] In some embodiments, the transmission assembly further includes a secondary nut, which is screwed to the lead screw, and the main nut and the secondary nut are connected by a connecting pin, with an elastic element provided between the main nut and the secondary nut.

[0020] In some embodiments, the elastic preload assembly includes a hollow shaft, an elastic compression member, and a sensing abutment plate. The hollow shaft is anti-rotationally sleeved on the lead screw, and the lead screw is slidably connected to the hollow shaft. The first drive assembly is drively connected to the hollow shaft. The sensing abutment plate is disposed at the end of the lead screw away from the push rod. The elastic compression member is sleeved on the lead screw, and one end of the elastic compression member abuts against the sensing abutment plate, while the other end of the elastic compression member abuts against the end face of the hollow shaft.

[0021] In some embodiments, a position detection component is further included, the position detection component including a first position detection sensor for detecting the position of the sensing abutment plate.

[0022] A centrifuge, comprising a mounting housing and an axially pre-tightened sealing mechanism as described above, the axially pre-tightened sealing mechanism being disposed within the mounting housing.

[0023] The beneficial effects of this utility model are:

[0024] This utility model provides an axially pre-tightened sealing mechanism. An outer drum is fixedly mounted at the first end of a hollow main shaft. A push rod slides through the hollow main shaft and is anti-rotatingly connected to it. Both ends of the push rod extend relative to the hollow main shaft. The first end of an inner drum is coaxially fixed with the first end of the push rod. A filter bag is installed between the outer and inner drums. The pre-tightening structure is driven by the push rod, causing the second end of the inner drum to seal against the second end of the outer drum. This method effectively ensures a tight seal between the inner and outer drums, preventing leakage and thus avoiding waste of centrifugal material.

[0025] The centrifuge provided by this utility model includes a mounting housing and an axially pre-tightened sealing mechanism as described above, which can ensure an effective seal between the inner drum and the outer drum, prevent leakage, and thus avoid waste of centrifugal materials. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of an axially pre-tightening sealing mechanism according to this utility model;

[0028] Figure 2 yes Figure 1A magnified view of a section at point A in the middle;

[0029] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0030] Figure 4 yes Figure 1 A magnified view of a section at point C;

[0031] Figure 5 yes Figure 1 A magnified view of a section at point D.

[0032] In the picture:

[0033] 1. Hollow spindle; 11. Guide assembly; 111. Guide key; 112. Mounting ring; 2. Outer drum; 3. Push rod; 4. Inner drum; 41. Fixing plate; 42. End sealing plate; 421. Abutment part; 422. First sealing ring; 423. Second sealing ring; 43. Connecting rod; 5. Filter bag; 6. First drive assembly; 61. First driven pulley; 7. Transmission assembly; 71. Main nut; 72. Secondary nut; 73. Elastic element; 74. Lead screw; 8. Elastic preload assembly; 81. Sensing abutment plate; 82. Elastic compression element; 83. First position detection sensor; 84. Second position detection sensor; 85. Hollow shaft; 9. Second drive assembly; 91. Second driven pulley. Detailed Implementation

[0034] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0035] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0036] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0037] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0038] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0039] During centrifuge operation, in order to ensure an effective seal between the inner and outer drums and prevent leakage, thereby avoiding waste of centrifuged materials, such as... Figures 1-5 As shown, this utility model provides an axially pre-tightened sealing mechanism. The axially pre-tightened sealing mechanism includes a hollow main shaft 1, an outer rotating drum 2, a push rod 3, an inner rotating drum 4, a filter bag 5, and a pre-tightening structure.

[0040] The outer drum 2 is coaxially fixed at its first end to the first end of the hollow main shaft 1, and has a receiving cavity. The push rod 3 slides through the hollow main shaft 1 and is anti-rotationally connected to it, with both ends extending outwards from the shaft. The inner drum 4 is located within the receiving cavity, and its first end is coaxially fixed with the push rod 3 near the first end of the outer drum 2. The second end of the inner drum 4 seals the opening of the receiving cavity. One end of the filter bag 5 is connected to the second end of the outer drum 2, and the other end is connected to the first end of the inner drum 4. A pre-tightening structure is connected to the push rod 3, driving it to seal the second end of the inner drum 4 against the second end of the outer drum 2.

[0041] The above method can effectively ensure a proper seal between the inner drum 4 and the outer drum 2, preventing leakage and thus avoiding waste of centrifugal materials.

[0042] In some embodiments, the inner drum 4 includes a fixing plate 41 and an end sealing plate 42. The fixing plate 41 and the end sealing plate 42 are arranged parallel to each other along the axial direction of the hollow main shaft 1. The fixing plate 41 is connected to the end sealing plate 42 via a connecting rod 43. The fixing plate 41 is connected to the first end of the push rod 3. The end sealing plate 42 is used to seal the opening of the receiving cavity. With the above arrangement, during centrifugation, the end sealing plate 42 seals the receiving cavity, forming a closed receiving cavity between the end sealing plate 42 and the outer drum 2, thereby preventing centrifugal material from leaking from the gap between the end sealing plate 42 and the outer drum 2 during centrifugation. The fixing plate 41 is located in the receiving cavity, and the fixing plate 41 cooperates with the second end of the outer drum 2 to effectively fix the filter bag 5.

[0043] In some embodiments, a first mounting groove is formed on the circumferential surface of the end sealing plate 42 along the circumferential direction. A first sealing ring 422 is embedded in the first mounting groove and protrudes relative to the first mounting groove, allowing the first sealing ring 422 to abut against the inner wall surface of the outer drum 2. The first mounting groove facilitates the positioning and installation of the first sealing ring 422. The first sealing ring 422 effectively seals the gap between the inner wall surface of the outer drum 2 and the end sealing plate 42, thereby ensuring sealing performance.

[0044] In some embodiments, the end sealing plate 42 has an abutment portion 421, and a second mounting groove is formed on the side of the abutment portion 421 facing the outer drum 2. A second sealing ring 423 is embedded in the second mounting groove, and the second sealing ring 423 protrudes relative to the second mounting groove, so that the second sealing ring 423 can abut against the second end face of the outer drum 2. By providing the second mounting groove, it is convenient to position and install the second sealing ring 423. By providing the second sealing ring 423, the gap between the second end face of the outer drum 2 and the end sealing plate 42 can be sealed, thereby further ensuring the sealing performance.

[0045] In some embodiments, the pre-tightening structure includes a first drive assembly 6, a transmission assembly 7, and an elastic pre-tightening assembly 8. The transmission assembly 7 is disposed at the second end of the push rod 3, and the first drive assembly 6 is drively connected to the transmission assembly 7 so that the transmission assembly 7 drives the push rod 3 to move relative to the hollow main shaft 1, so that the second end of the inner drum 4 seals against the second end of the outer drum 2. The elastic pre-tightening assembly 8 is disposed on the transmission assembly 7, and the elastic pre-tightening assembly 8 has the tendency to cause the push rod 3 to seal against the second end of the inner drum 4 against the second end of the outer drum 2. By driving the transmission assembly 7 through the first drive assembly 6, the transmission assembly 7 drives the push rod 3 to move, so that the end sealing plate 42 of the inner drum 4 fits against the outer drum 2. At the same time, the elastic pre-tightening assembly 8 is compressed. Under the elastic force of the elastic pre-tightening assembly 8, the end sealing plate 42 of the inner drum 4 tightly abuts against the second end of the outer drum 2, thereby playing a pre-tightening role and ensuring the sealing performance between the outer drum 2 and the inner drum 4.

[0046] In some embodiments, the transmission assembly 7 includes a lead screw 74 and a main nut 71. One end of the lead screw 74 is coaxially inserted into the push rod 3, and the main nut 71 is coaxially fixedly disposed at the second end of the push rod 3, and the main nut 71 is threadedly connected to the lead screw 74. The first drive assembly 6 is drively connected to the lead screw 74. The first drive assembly 6 drives the lead screw 74 to rotate around its own axis, so that the main nut 71 drives the push rod 3 to move along the axial direction of the lead screw 74, thereby causing the end sealing plate 42 to fit against the outer drum 2. The lead screw and nut structure allows for accurate control of the movement distance of the push rod 3.

[0047] In some embodiments, the transmission assembly 7 further includes a secondary nut 72, which is screwed to the lead screw 74. The main nut 71 and the secondary nut 72 are connected by a connecting pin, and an elastic element 73 is provided between the main nut 71 and the secondary nut 72. Specifically, the axis of the connecting pin is parallel to the axis of the push rod 3. The connecting pin connects the main nut 71 and the secondary nut 72, allowing the secondary nut 72 to move axially along the connecting pin. The spring ensures that the threads of both the main nut 71 and the secondary nut 72 are tightly engaged with the threads of the lead screw 74, eliminating thread clearance. Therefore, during transmission, noise generated by thread collisions can be eliminated, and thread damage and failure caused by mutual collisions between threads can be avoided.

[0048] In some embodiments, the elastic preload assembly 8 includes a hollow shaft 85, an elastic compression member 82, and a sensing abutment plate 81. The hollow shaft 85 is anti-rotationally sleeved on the lead screw 74, and the lead screw 74 is slidably connected to the hollow shaft 85. The first drive assembly 6 is drively connected to the hollow shaft 85. The sensing abutment plate 81 is disposed at the end of the lead screw 74 away from the push rod 3. The elastic compression member 82 is sleeved on the lead screw 74, with one end of the elastic compression member 82 abutting against the sensing abutment plate 81 and the other end of the elastic compression member 82 abutting against the end face of the hollow shaft 85. Specifically, the lead screw 74 is connected to the hollow shaft 85 by a key, and the lead screw 74 can slide axially relative to the hollow shaft 85. When the lead screw 74 cooperates with the main nut 71 and the secondary nut 72 to drive the push rod 3 to move until the end sealing plate 42 is in contact with the outer drum 2, the push rod 3 can no longer move. At this time, the lead screw 74 rotates and moves relative to the lead screw, thereby driving the induction contact plate 81 to move towards the compression elastic compression member 82 to the set position. At this time, the elastic compression member 82 is in a compressed and stored state. Under the elastic force of the elastic compression member 82, a force is applied to the lead screw 74 away from the hollow shaft 85, thereby driving the push rod 3 through the main nut 71, so that the end sealing plate 42 of the inner drum 4 connected to the push rod 3 abuts against the second end face of the outer drum 2, thereby achieving a good pre-tightening sealing effect. In this embodiment, the elastic compression member 82 is a butterfly spring. In other embodiments, the elastic compression member 82 can be a compression spring, and no further restrictions are imposed here.

[0049] In some embodiments, the first drive assembly 6 employs belt drive, with the first driving pulley and the first driven pulley 61 connected via a first belt, and the first driven pulley 61 connected to the lead screw 74. The first driving pulley is driven to rotate by a motor, and the first driving pulley drives the first driven pulley 61 to rotate via the first belt. The first driven pulley 61 is fixedly sleeved on the hollow shaft 85. Through this method, the movement of the push rod 3 and the lead screw 74 can be accurately controlled by the cooperation between the lead screw 74 and the main nut 71, thereby achieving pre-tightening sealing. In other embodiments, a motor combined with gear drive or chain drive can also be used as the first drive assembly 6; no further limitations are imposed here.

[0050] In some embodiments, a guide assembly 11 is provided between the push rod 3 and the hollow spindle 1. A guide groove is formed on the hollow spindle 1 along its axial direction. The guide assembly 11 includes a guide key 111 and a mounting ring 112. The guide key 111 is fixedly mounted on the push rod 3 and is located in the guide groove. The mounting ring 112 is sleeved on the push rod 3 and connected to the guide key 111. By cooperating with the guide groove, the push rod 3 can rotate synchronously with the spindle, thereby causing the outer drum 2 and the inner drum 4 to rotate synchronously, achieving centrifugal operation.

[0051] In some embodiments, the axially pre-tightened sealing mechanism further includes a position detection component, which includes a first position detection sensor 83 for detecting the position of the sensing abutment plate 81. When the lead screw 74 moves the sensing abutment plate 81, and the first position detection sensor 83 detects the sensing abutment plate 81, it can be determined that the elastic compression member 82 is compressed into place. Through the above configuration, the pre-tightened position of the elastic compression member 82 can be detected, ensuring the effectiveness of the pre-tightened seal.

[0052] In some embodiments, the position detection assembly further includes a second position detection sensor 84, which is used to detect the position of the mounting ring 112. When the lead screw 74 drives the main nut 71, thereby driving the push rod 3 to move, the end sealing plate 42 is in contact with the outer drum 2. At this time, the mounting ring 112 is directly opposite the second position detection sensor 84. When the second position detection sensor 84 detects the mounting ring 112, it can be determined that the end sealing plate 42 is in contact with the outer drum 2. Through the above arrangement, the position of the end sealing plate 42 can be detected, ensuring the effect of pre-tightening sealing.

[0053] In some embodiments, the axially pre-tightened sealing mechanism further includes a second drive assembly 9, which is connected to the hollow spindle 1 via a transmission connection. The second drive assembly 9 is used to drive the hollow spindle 1 to rotate around its own axis. Specifically, in this embodiment, the second drive assembly 9 adopts a belt drive, with the second driving pulley and the second driven pulley 91 connected via a second belt. The second driven pulley 91 is fixedly connected to the hollow spindle 1. The second driving pulley is driven to rotate by a motor, and the second driving pulley drives the second driven pulley 91 to rotate via the second belt. During the rotation of the second driven pulley 91, the second driven pulley 91 drives the hollow spindle 1 and the push rod 3 to rotate synchronously. Under the action of friction, the transmission nut drives the lead screw 74 to rotate synchronously. At this time, the outer drum 2 and the inner drum 4 rotate synchronously, realizing centrifugal operation.

[0054] The working process of this axial pre-tightening sealing mechanism is as follows:

[0055] After the inner drum 4 is closed, the second position detection sensor 84 detects the mounting ring 112. At this time, the first driven pulley 61 continues to rotate. Since the inner drum 4 is in contact with the outer drum 2, it cannot continue to move axially. At this time, the lead screw 74 drives the sensing abutment plate 81 to move, compressing the elastic compression member 82, until the first position detection sensor 83 detects the sensing abutment plate 81, and the second driven pulley 91 stops rotating. At this time, the compression elastic member 73 is in a compressed state. Through the lead screw 74, the main nut 71 and the auxiliary nut 72, the inner drum 4 always has an axial preload when it is closed and rotating, ensuring that the inner drum 4 will not move and achieving a reliable seal.

[0056] This application also provides a centrifuge, which includes a mounting housing and an axially pre-tightened sealing mechanism as described above. The axially pre-tightened sealing mechanism is disposed in the mounting housing and can ensure an effective seal between the inner drum 4 and the outer drum 2, preventing leakage and thus avoiding waste of centrifuged materials.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An axially pre-tightened sealing mechanism, characterized in that, include: Hollow spindle (1); The outer drum (2) has its first end coaxially fixed at the first end of the hollow main shaft (1) and has a receiving cavity. Push rod (3), the push rod (3) is slidably inserted in the hollow main shaft (1), and the push rod (3) is anti-rotationally connected to the hollow main shaft (1), and the two ends of the push rod (3) extend out relative to the hollow main shaft (1); The inner drum (4) is located in the receiving cavity, and the first end of the inner drum (4) is fixedly arranged coaxially with the first end of the push rod (3) near the outer drum (2), and the second end of the inner drum (4) blocks the opening of the receiving cavity; Filter bag (5), one end of which is connected to the second end of the outer drum (2), and the other end of which is connected to the first end of the inner drum (4); The pre-tightening structure is connected to the push rod (3) in a transmission manner. The pre-tightening structure can drive the push rod (3) so that the second end of the inner drum (4) is sealed and abutted against the second end of the outer drum (2).

2. The axially pre-tightened sealing mechanism according to claim 1, characterized in that, The inner drum (4) includes a fixed plate (41) and an end sealing plate (42). The fixed plate (41) and the end sealing plate (42) are arranged parallel to each other along the axial direction of the hollow main shaft (1). The fixed plate (41) is connected to the end sealing plate (42) through a connecting rod (43). The fixed plate (41) is connected to the first end of the push rod (3). The end sealing plate (42) is used to block the opening of the receiving cavity.

3. The axially pre-tightened sealing mechanism according to claim 2, characterized in that, A first mounting groove is provided on the circumferential surface of the end sealing plate (42) along the circumferential direction. A first sealing ring (422) is embedded in the first mounting groove and protrudes from the first mounting groove. The first sealing ring (422) can abut against the inner wall surface of the outer drum (2).

4. The axially pre-tightened sealing mechanism according to claim 2, characterized in that, The end sealing plate (42) has an abutment portion (421), and the abutment portion (421) has a second mounting groove on the side facing the outer drum (2). The second sealing ring (423) is embedded in the second mounting groove and protrudes from the second mounting groove. The second sealing ring (423) can abut against the second end face of the outer drum (2).

5. The axially pre-tightened sealing mechanism according to claim 1, characterized in that, The pre-tightening structure includes a first drive assembly (6), a transmission assembly (7), and an elastic pre-tightening assembly (8). The transmission assembly (7) is disposed at the second end of the push rod (3). The first drive assembly (6) is connected to the transmission assembly (7) so that the transmission assembly (7) drives the push rod (3) to move relative to the hollow main shaft (1), so that the second end of the inner drum (4) seals against the second end of the outer drum (2). The elastic pre-tightening assembly (8) is disposed on the transmission assembly (7). The elastic pre-tightening assembly (8) has the tendency to cause the push rod (3) to seal against the second end of the inner drum (4) against the second end of the outer drum (2).

6. The axially pre-tightened sealing mechanism according to claim 5, characterized in that, The transmission assembly (7) includes a lead screw (74) and a main nut (71). One end of the lead screw (74) is coaxially inserted into the push rod (3). The main nut (71) is coaxially fixed at the second end of the push rod (3) and is threadedly connected to the lead screw (74). The first drive assembly (6) is connected to the lead screw (74) in a transmission manner.

7. The axially pre-tightened sealing mechanism according to claim 6, characterized in that, The transmission assembly (7) also includes a secondary nut (72), which is screwed to the lead screw (74). The main nut (71) and the secondary nut (72) are connected by a connecting pin. An elastic element (73) is provided between the main nut (71) and the secondary nut (72).

8. The axially pre-tightened sealing mechanism according to claim 6, characterized in that, The elastic preload assembly (8) includes a hollow shaft (85), an elastic compression member (82), and a sensing abutment plate (81). The hollow shaft (85) is anti-rotationally sleeved on the lead screw (74), and the lead screw (74) is slidably connected to the hollow shaft (85). The first drive assembly (6) is drively connected to the hollow shaft (85). The sensing abutment plate (81) is disposed at the end of the lead screw (74) away from the push rod (3). The elastic compression member (82) is sleeved on the lead screw (74), and one end of the elastic compression member (82) abuts against the sensing abutment plate (81), while the other end of the elastic compression member (82) abuts against the end face of the hollow shaft (85).

9. The axially pre-tightened sealing mechanism according to claim 8, characterized in that, It also includes a position detection component, which includes a first position detection sensor (83) for detecting the position of the sensing contact plate (81).

10. A centrifuge, characterized in that, It includes a mounting housing and an axially pre-tightened sealing mechanism as described in any one of claims 1-9, wherein the axially pre-tightened sealing mechanism is disposed in the mounting housing.

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