Compression assembly device, biological safety cabinet

Abstract

This application relates to the field of mechanical tooling technology and discloses a compression assembly device comprising a compression bolt and a locking sleeve. The compression bolt comprises a screw and a bolt head, the screw passing through a first through-hole of a compression plate and being screwed into a first bolt hole of a base plate. The locking sleeve is sleeved over the screw of the compression bolt and positioned between the compression plate and the base plate. When the bolt is rotated in a first direction, the bolt head of the compression bolt pushes the compression plate toward the base plate; when the bolt is rotated in a second direction, the locking sleeve pushes the compression plate away from the base plate. This application also discloses a biological safety cabinet.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical tooling, for example, to a compression assembly device and a biological safety cabinet. Background Art

[0002] The biological safety cabinet has relatively high requirements for air quality. The filter needs to be pressed tightly between the fan and the vent so that the air flowing through the vent can be fully filtered and purified.

[0003] In the related art, when replacing the filter, it is necessary to remove the fan fixing bolts, and then use tools such as a hoist and a jack to separate the fan from the filter. After the filter is replaced, the fan is reinstalled.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] The space inside the biosafety cabinet is small, making operation difficult and inconvenient for installing mechanical devices such as hoists and jacks. The fan lacks effective fixation after it loses contact with the filter, posing a risk of occupational hazards. Summary of the Invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a compression assembly device and a biosafety cabinet to solve the problem of how to reduce the difficulty of replacing a filter screen of a biosafety cabinet.

[0008] In some embodiments, the clamping assembly device includes a clamping bolt and a locking sleeve, wherein the clamping bolt includes a screw and a bolt head, the screw passes through the first through hole of the clamping plate and is screwed into the first bolt hole of the substrate; the locking sleeve is sleeved on the screw of the clamping bolt and is located between the clamping plate and the substrate; when the bolt rotates in a first direction, the bolt head of the clamping bolt pushes the clamping plate close to the substrate; when the bolt rotates in a second direction, the locking sleeve pushes the clamping plate away from the substrate.

[0009] In some embodiments, the locking sleeve includes a first locking member, a second locking member and a first locking bolt, wherein the first locking member is provided with a first clamping portion at the first end and a second bolt hole at the second end; the second locking member is provided with a second clamping portion at the first end and a second through hole at the second end, and the second clamping portion is clamped with the first clamping portion; the first locking bolt passes through the second through hole and is screwed into the second bolt hole.

[0010] In some embodiments, the screw rod of the compression bolt is configured with an annular groove, and the first locking member and the second locking member are clamped into the annular groove.

[0011] In some embodiments, the locking sleeve includes a sleeve and a second locking bolt, wherein the sleeve is sleeved on the screw rod, the sleeve has a third bolt hole opened in the radial direction, and the second locking bolt is screwed into the third bolt hole to lock the sleeve.

[0012] In some embodiments, the screw rod of the clamping bolt is configured with a limiting groove, and the end of the second locking bolt extends into the limiting groove.

[0013] In some embodiments, the clamping bolt is a partially threaded bolt, one end close to the bolt head is a screw area, and the other end is a threaded area; wherein the locking sleeve is sleeved on the screw area of ​​the clamping screw.

[0014] In some embodiments, the compression assembly device further includes a first plane bearing, which is sleeved on the screw rod of the compression bolt and lined between the locking sleeve and the compression plate.

[0015] In some embodiments, the compression assembly device further includes a second plane bearing, which is sleeved on the screw rod of the compression bolt and is located between the compression plate and the bolt head of the locking bolt.

[0016] In some embodiments, the compression assembly device further includes a nut welded to the base plate to form the first bolt hole.

[0017] In some embodiments, the biosafety cabinet includes a fan, a housing, a filter, a press bolt and a locking sleeve, wherein the fan is provided with a press plate, which has a first through hole; the housing includes a base plate, which has a first bolt hole and is configured with a vent; the filter covers the vent and is lined between the fan and the base plate; the press bolt includes a screw and a bolt head, the screw passes through the first through hole of the press plate and is screwed into the first bolt hole of the base plate; the locking sleeve is sleeved on the screw of the press bolt and is located between the press plate and the base plate; when the bolt rotates in a first direction, the bolt head of the bolt pushes the press plate close to the base plate to compress the filter; when the bolt rotates in a second direction, the locking sleeve pushes the press plate away from the base plate to release the pressure on the filter.

[0018] The compression assembly device and biosafety cabinet provided by the embodiments of the present disclosure can achieve the following technical effects:

[0019] 1. By rotating the clamping bolt in the first direction and the second direction, the first clamping plate can be driven to move in both directions, thereby further achieving the clamping and releasing of the clamped object, making it easier to operate in a narrow space.

[0020] 2. When the clamping object is released, the clamping plate is still fixed by the clamping bolts and will not shift or fall off, which improves the safety of replacing the clamping object;

[0021] 3. After releasing the clamping object, continue to rotate the clamping bolt in the second direction to remove the clamping plate, which is flexible to use.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0024] Figure 1 is a structural schematic diagram of a compression assembly device provided by an embodiment of the present disclosure;

[0025] Figure 2 is a structural schematic diagram of another compression assembly device provided by an embodiment of the present disclosure;

[0026] Figure 3 is a structural schematic diagram of another compression assembly device provided by an embodiment of the present disclosure;

[0027] Figure 4 This is a schematic structural diagram of a compression bolt of a compression assembly device provided by an embodiment of the present disclosure;

[0028] Figure 5 This is a schematic structural diagram of a locking sleeve of a compression assembly device provided by an embodiment of the present disclosure;

[0029] Figure 6 2 is a schematic structural diagram of a locking sleeve of another compression assembly device provided by an embodiment of the present disclosure;

[0030] Figure 7 It is a structural schematic diagram of a biological safety cabinet provided by an embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 100: Clamping bolt; 110: Screw; 120: Bolt head; 130: Threaded area; 140: Screw area; 150: Annular groove; 210: Clamping plate; 220: Clamping object; 230: Base plate; 300: Locking sleeve; 310: First locking member; 320: Second locking member; 330: First locking bolt; 340: Sleeve; 350: Second locking bolt; 410: First plane bearing; 420: Second plane bearing; 500: Nut; 610: Housing; 620: Fan; 630: Filter. DETAILED DESCRIPTION

[0033] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0034] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0036] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0037] Unless otherwise stated, the term "plurality" means two or more.

[0038] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0039] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0041] The filter in a biosafety cabinet is a consumable part and requires regular replacement. Some biosafety cabinets feature a filter slot, allowing the filter to be removed when replacement is needed. While this arrangement simplifies filter replacement, it prevents the filter from fitting tightly against the fan. When the fan is running, some air will not pass through the filter, potentially contaminating or leaking samples within the biosafety cabinet.

[0042] To address this issue, the biosafety cabinet provided in the disclosed embodiment utilizes a fan to press the filter against the vent. Specifically, the vent is provided with a bolt hole, and the fan is provided with a corresponding bolt hole. The fan is fixed to the box plate where the vent is located by rotating the bolts, while simultaneously pressing the filter to improve the airtightness between the box plate where the vent is located, the filter, and the fan. Preferably, the filter is provided with a ring of elastic material. When the fan presses the filter, the elastic material deforms to fill the gap between the fan and the box plate where the vent is located, thereby improving the safety of the biosafety cabinet.

[0043] With this setup, to replace the filter, you need to loosen the hold-down bolts, move the fan away from the vent panel, and position the fan so that the distance between the fan and the vent panel is greater than the thickness of the filter. Then, pull the filter out. After replacing the filter, you need to turn the hold-down bolts to re-press the fan against the vent panel.

[0044] During this process, the fan must be moved back and forth. Due to the limited space within the biosafety cabinet, the fan is heavy and difficult to replace. Using jacks and hoist tools is also difficult due to the limited space. Failure to properly secure the fan during movement could result in injury to the operator.

[0045] In order to make it easy to replace the middle pressed object in the pressed assembly, Figure 1-7 As shown, an embodiment of the present disclosure provides a clamping assembly device, including a clamping bolt 100 and a locking sleeve 300, wherein the clamping bolt 100 includes a screw rod 110 and a bolt head 120, and the screw rod 110 passes through the first through hole of the clamping plate 210 and is screwed into the first bolt hole of the base plate 230; the locking sleeve 300 is sleeved on the screw rod 110 of the clamping bolt and is located between the clamping plate 210 and the base plate 230; when the bolt rotates in a first direction, the bolt head 120 of the clamping bolt pushes the clamping plate 210 close to the base plate 230; when the bolt rotates in a second direction, the locking sleeve 300 pushes the clamping plate 210 away from the base plate 230.

[0046] The application scenario of the compression assembly device provided by the embodiment of the present disclosure includes a compression plate 210 and a base plate 230, and the compressed object 220 is located between the compression plate 210 and the base plate 230. In some cases, the compression plate 210 and the base plate 230 can be interchangeable. For example, the box plate where the ventilation hole of the biosafety cabinet is located is the base plate 230, the fixed plate of the fan 620 is the compression plate 210, the filter screen 630 is the compressed object 220, and the compression bolt 100 presses the fan 620 toward the box plate where the ventilation hole is located. Similarly, it can be considered that the box plate where the ventilation hole is located is the compression plate 210, the fixed plate of the fan 620 is the base plate 230, the filter screen 630 is the compressed object 220, and the compression bolt 100 presses the box plate where the ventilation hole is located toward the fixed plate of the fan 620.

[0047] The clamping plate 210 is provided with a through hole, and the base plate 230 is provided with a first bolt hole. The clamping bolt 100 includes a screw rod 110 and a bolt head. The screw rod 110 of the clamping bolt passes through the through hole and is screwed into the first bolt hole. When the clamping bolt 100 rotates in a first direction and is screwed into the first bolt hole, the bolt head of the clamping bolt 100 presses the clamping plate 210 against the base plate 230, thereby pressing the clamping object 220 between the clamping plate 210 and the base plate 230. When the clamping bolt 100 rotates in a second direction, the clamping bolt 100 is unscrewed from the first bolt hole, releasing the clamping bolt 100 from the clamping plate 210. Due to factors such as the weight of the clamping plate 210 itself and the friction between the clamping plate 210 and the clamping bolt 100, the clamping plate 210 may still be in close contact with the clamping object 220, and the clamping object 220 cannot be smoothly withdrawn.

[0048] The locking sleeve 300 is sleeved over the screw 110 of the compression bolt and positioned between the compression plate 210 and the compression plate 210. In this configuration, the movement of the locking plate is constrained by both the bolt head of the compression bolt 100 and the locking sleeve 300. When the compression bolt 100 rotates in a first direction, the bolt head 120 of the locking sleeve pushes the compression plate 210 toward the base plate 230. When the compression bolt 100 rotates in a second direction, the locking sleeve 300 pushes the compression plate 210 away from the base plate 230. In this manner, rotating the compression bolt 100 in both the first and second directions drives the first compression plate 210 to move in both directions, further achieving compression and release of the object 220. Only the clamping bolt 100 needs to be turned, which makes it easy to operate in a narrow space; when the clamping object 220 is released, the clamping plate 210 is still fixed by the clamping bolt 100 and will not shift or fall off, thereby improving the safety of replacing the clamping object 220; after the clamping object 220 is released, the bolt can be continued to be turned in the second direction to remove the clamping plate 210, which is flexible to use.

[0049] Optionally, the locking sleeve 300 includes a first locking member 310, a second locking member 320 and a first locking bolt 330, wherein the first locking member 310 is provided with a first clamping portion at the first end and a second bolt hole at the second end; the second locking member 320 is provided with a second clamping portion at the first end and a second through hole at the second end, and the second clamping portion is clamped with the first clamping portion; the first locking bolt 330 is screwed into the second bolt hole through the second through hole.

[0050] The first locking member 310 is semicircular, and the second locking member 320 is also semicircular. When joined, the first and second locking members 310 and 320 form a ring, allowing them to be sleeved onto the screw 110 of the compression bolt. A first clamping portion is provided at the first end of the first locking member 310, and a second clamping portion is provided at the first end of the second locking member 320. The first and second clamping portions are engaged with each other, thereby achieving the connection between the first and second locking members 310 and 320. The first and second clamping members are rotatably engaged. That is, after the first and second ends of the first and second locking members 310 and 320 are engaged, the distance between the first and second locking members 310 and 320 can be changed by rotating the second end of the first or second locking member 310, thereby achieving locking and unlocking. A second bolt hole is defined at the second end of the first locking member 310, and a second through-hole is defined at the second end of the second locking member 320. The first locking bolt 330 is threaded into the second bolt hole through the second through-hole. When the first locking bolt 330 is rotated in the tightening direction (generally clockwise), the distance between the second end of the first locking member 310 and the second end of the second locking member 320 decreases until the first and second locking members 310, 320 engage the screw 110 of the compression bolt. This achieves the locking function of the locking sleeve 300. When the second locking bolt 350 is rotated in the loosening direction (generally counterclockwise), the distance between the second end of the first locking member 310 and the second end of the second locking member 320 increases, allowing the locking sleeve 300 to slide along the screw 110 to adjust its position on the screw 110. Continuing to rotate the second locking screw in the direction of loosening the bolt, the second locking bolt 350 is removed, and the first locking member 310 and the second locking member 320 can be separated. With this arrangement, the locking sleeve 300 is easy to disassemble and assemble, the locking force is adjustable, and the contact area between the locking sleeve 300 and the compression bolt 100 is large, so the force is evenly distributed.

[0051] Optionally, the screw rod 110 of the compression bolt is configured with an annular groove 150 , and the first locking member 310 and the second locking member 320 are engaged in the annular groove 150 .

[0052] The first locking member 310 and the second locking member 320 are inserted into the annular groove 150. When the locking sleeve 300 locks the screw 110 of the compression bolt, the annular groove 150 acts as a limiter, preventing the sleeve 300 from sliding along the screw 110 of the compression bolt. With this arrangement, the locking sleeve 300 can better support the compression plate 210.

[0053] Optionally, the locking sleeve 300 includes a sleeve 340 and a second locking bolt 350 , wherein the sleeve 340 is sleeved on the screw 110 , the sleeve 340 is provided with a third bolt hole along the radial direction, and the second locking bolt 350 is screwed into the third bolt hole to lock the sleeve 340 .

[0054] The sleeve 340 of the locking sleeve 300 is sleeved over the screw 110 of the compression bolt. The second locking bolt 350 is screwed into the third bolt hole, with its tip contacting the screw 110 of the compression bolt. The second locking bolt 350 and the inner wall of the sleeve 340 clamp the screw 110 of the compression bolt, thereby achieving the locking function of the locking sleeve 300.

[0055] Optionally, the screw rod 110 of the compression bolt is configured with a limiting groove, and the end of the second locking bolt 350 extends into the limiting groove.

[0056] The second locking bolt 350 is screwed into the third bolt hole along the radial direction of the clamping bolt 100, and the contact area with the clamping bolt 100 is small. The limiting groove can be an annular groove 150, or it can be a pit-shaped groove corresponding to the end of the second locking bolt 350. The limiting groove is an annular groove 150, and there is no need to adjust the relative angle between the sleeve 340 and the screw 110 of the clamping bolt. It is only necessary to adjust the position of the sleeve 340 on the screw 110 of the clamping bolt, and the end of the second locking bolt 350 can be extended into the limiting groove. The limiting groove is a pit-shaped groove, and the sleeve position and sleeve angle of the sleeve 340 on the clamping bolt 100 are limited. Compared with the form of opening the annular groove 150, this form requires less cutting amount for processing, and the structural strength of the clamping bolt 100 itself is less affected.

[0057] Optionally, the clamping bolt 100 is a partially threaded bolt, with one end close to the bolt head being the screw region 140 and the other end being the threaded region 130 ; wherein the locking sleeve 300 is sleeved on the screw region 140 of the clamping screw 110 .

[0058] From the bolt head to the end, the compression bolt 100 comprises the bolt head, the shank region 140, and the threaded region 130. The shank region 140 refers to the area of ​​the compression bolt where no threads are formed. The locking sleeve 300 fits over the shank region 140 to prevent deformation and fracture of the threads. Furthermore, the locking sleeve 300 fits over the shank region 140, providing a larger contact area with the compression bolt and ensuring a better securement of the compression bolt 100.

[0059] Optionally, the compression assembly device further includes a first plane bearing 410 , which is sleeved on the screw 110 of the compression bolt and lined between the locking sleeve 300 and the compression plate 210 .

[0060] When the locking sleeve 300 pushes the pressure plate 210 away from the base plate 230, the pressure plate 210 and base plate 230 do not rotate, while the locking sleeve 300 rotates along with the pressure bolt 100. This results in a high surface friction between the locking sleeve 300 and the pressure plate 210. A plane bearing comprises a planar retainer and rolling elements. The planar retainer is annular and has multiple spaces for the rolling elements along its circumference. The rolling elements are arranged in a one-to-one correspondence within the multiple rolling element spaces. The rolling elements are needle rollers, cylindrical rollers, or balls, extending above and below the planar retainer. Planar bearings convert surface friction between two coaxially rotating components into rolling friction. A first planar bearing 410 is mounted on the screw 110 of the pressure bolt, positioned between the locking sleeve 300 and the pressure plate 210. This reduces friction between the locking sleeve 300 and the pressure plate 210 when the pressure bolt 100 is rotated. The first plane bearing 410 is provided, which not only allows the pressing bolt 100 to be rotated more effortlessly, but also reduces the noise caused by the friction between the pressing plate 210 and the locking sleeve 300, and also extends the service life of the pressing assembly device.

[0061] Optionally, the compression assembly device further includes a second plane bearing 420 , which is sleeved on the screw rod 110 of the compression bolt and is located between the compression plate 210 and the bolt head of the locking bolt.

[0062] When the compression bolt 100 is rotated to press the compression plate 210 against the base plate 230, the compression bolt 100 rotates while the compression plate 210 does not. This creates significant surface friction between the bolt head of the compression bolt 100 and the compression plate 210. The provision of a second planar bearing 420 converts this surface friction into rolling friction, significantly reducing the resistance to rotating the compression bolt 100 and making rotation of the compression bolt 100 more labor-efficient. Furthermore, the provision of the second planar bearing 420 reduces frictional noise between the bolt head of the compression bolt 100 and the compression plate 210, alleviating frictional losses and extending the service life of the compression assembly.

[0063] Optionally, the compression assembly device further includes a nut 500 welded to the base plate 230 to form a first bolt hole.

[0064] The nut 500 is welded to the base plate 230 to form a first bolt hole, and the compression bolt 100 is screwed into the nut 500. This can reduce the difficulty of opening the first bolt hole and reduce the cost of the compression assembly device.

[0065] Optionally, the base plate 230 is provided with an avoidance hole corresponding to the nut 500 , and the avoidance hole is coaxial with and connected to the first bolt hole formed by the nut 500 .

[0066] With such a configuration, the stroke of the screw rod 110 of the clamping bolt in the first bolt hole is not limited by the base plate 230 , and the stroke of the clamping bolt 100 is longer, which is convenient for users.

[0067] Combine Figure 1-7 As shown, the embodiment of the present disclosure provides a biosafety cabinet, including a fan 620, a box body 610, a filter screen 630, a press bolt and a locking sleeve 300, wherein the fan 620 is provided with a pressing plate 210, and the pressing plate 210 is provided with a first through hole; the box body 610 includes a base plate 230, and the base plate 230 is provided with a first bolt hole and a vent; the filter screen 630 covers the vent and is lined between the fan 620 and the base plate 230; the pressing bolt 100 includes a screw 110 and the bolt head, the screw 110 passes through the first through hole of the clamping plate 210 and is screwed into the first bolt hole of the base plate 230; the locking sleeve 300 is sleeved on the screw 110 of the clamping bolt and is located between the clamping plate 210 and the base plate 230; when the bolt rotates in the first direction, the bolt head of the bolt pushes the clamping plate 210 close to the base plate 230 to clamp the filter 630; when the bolt rotates in the second direction, the locking sleeve 300 pushes the clamping plate 210 away from the base plate 230 to release the clamping on the filter 630.

[0068] The housing 610 of the fan 620 is provided with a vent, located on a base plate 230. A compression plate 210 is positioned around the circumference of the air outlet. The filter 630 is surrounded by an elastic material, with a filter assembly in the center. The compression plate 210 of the fan 620 presses the filter 630 against the vent of the housing 610. This arrangement ensures that all air flowing through the vent of the housing 610 is filtered by the filter 630, improving the safety of the biosafety cabinet.

[0069] The compression plate 210 defines a first through-hole, and the base plate 230 defines a first bolt hole. The screw 110 of the compression bolt passes through the first through-hole of the compression plate 210 and is screwed into the first bolt hole of the base plate 230. A locking sleeve 300 is sleeved onto the screw 110 of the compression bolt. Specifically, the bolt head 120 of the compression bolt 100 and the locking sleeve 300 jointly clamp the compression plate 210. When the filter 630 needs to be replaced, the compression bolt 100 is rotated in the second direction, raising the fan 620. The distance between the compression plate 210 of the fan 620 and the base plate 230 of the housing 610 increases until it exceeds the initial thickness of the filter 630. The old filter 630 can be removed parallel to the base plate 230, and the new filter 630 can be rotated back in parallel to the base plate 230. At this time, the clamping bolt 100 is rotated in the first direction, and the bolt head of the clamping bolt 100 pushes the clamping plate 210 toward the base plate 230 , thereby clamping the filter screen 630 between the clamping plate 210 and the base plate 230 .

[0070] When using the biosafety cabinet provided by the embodiment of the present disclosure, the fan 620 can be driven to move in both directions by rotating the clamping bolt 100, and the filter 630 can be easily replaced in the narrow space of the biosafety cabinet; after the compression of the filter 630 is released, the fan 620 is still fixed by the clamping bolt 100 and will not shift or fall, thereby improving the safety of replacing the filter 630; after the compression of the filter 630 is released, the fan 620 can be removed by continuing to rotate the bolt in the second direction, which provides flexible usage.

[0071] The above description and accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended salt claims.

Claims

1. A compression assembly device, characterized in that: include: A clamping bolt, comprising a screw rod and a bolt head, wherein the screw rod passes through the first through hole of the clamping plate and is screwed into the first bolt hole of the base plate, wherein the screw rod of the clamping bolt is configured with an annular groove; a locking sleeve, sleeved on the screw of the clamping bolt and located between the clamping plate and the base plate, wherein the locking sleeve locks the screw of the clamping bolt so as to rotate together with the screw; When the bolt is rotated in a first direction, the bolt head of the clamping bolt pushes the clamping plate closer to the base plate; when the bolt is rotated in a second direction, the locking sleeve pushes the clamping plate away from the base plate; Wherein, the locking sleeve comprises: A first locking member, having a first clamping portion provided at a first end and a second bolt hole provided at a second end; A second locking member, having a second clamping portion provided at a first end and a second through hole formed at a second end, wherein the second clamping portion is clamped with the first clamping portion, and the first locking member and the second locking member are clamped into the annular groove; a first locking bolt passing through the second through hole and screwed into the second bolt hole; A sleeve is sleeved on the screw rod, and the sleeve is provided with a third bolt hole along the radial direction. The second locking bolt is screwed into the third bolt hole to lock the sleeve.

2. The press-fit assembly device according to claim 1, wherein: The screw rod of the clamping bolt is configured with a limiting groove, and the end of the second locking bolt extends into the limiting groove.

3. The press-fit assembly device according to claim 1 or 2, characterized in that: The clamping bolt is a partially threaded bolt, with one end close to the bolt head being a screw area and the other end being a threaded area; Wherein, the locking sleeve is sleeved on the screw area of ​​the clamping bolt.

4. The press-fit assembly device according to claim 1 or 2, characterized in that: Also includes: The first plane bearing is sleeved on the screw rod of the clamping bolt and is lined between the locking sleeve and the clamping plate.

5. The press-fit assembly device according to claim 4, characterized in that: Also includes: The second plane bearing is sleeved on the screw rod of the clamping bolt and is located between the clamping plate and the bolt head of the locking bolt.

6. The press-fit assembly device according to claim 1 or 2, characterized in that: A nut is welded to the base plate to form the first bolt hole.

7. A biological safety cabinet, characterized in that: include: The fan is provided with a compression plate, wherein the compression plate is provided with a first through hole; The box body includes a base plate, wherein the base plate is provided with a first bolt hole and is configured with a vent; A filter screen, covering the vent and lining between the fan and the base plate; A clamping bolt, comprising a screw rod and a bolt head, wherein the screw rod passes through the first through hole of the clamping plate and is screwed into the first bolt hole of the base plate, and the screw rod of the clamping bolt is configured with an annular groove; A locking sleeve, sleeved on the screw of the clamping bolt and located between the clamping plate and the base plate; Wherein, the locking sleeve comprises: A first locking member, having a first clamping portion provided at a first end and a second bolt hole provided at a second end; A second locking member, having a second clamping portion provided at a first end and a second through hole formed at a second end, wherein the second clamping portion is clamped with the first clamping portion, and the first locking member and the second locking member are clamped into the annular groove; a first locking bolt passing through the second through hole and screwed into the second bolt hole; A sleeve is sleeved on the screw rod, and the sleeve is provided with a third bolt hole along the radial direction. a second locking bolt, screwed into the third bolt hole to lock the sleeve; When the bolt rotates in a first direction, the bolt head of the bolt pushes the clamping plate close to the base plate to compress the filter; when the bolt rotates in a second direction, the locking sleeve pushes the clamping plate away from the base plate to release the pressure on the filter.

8. The biosafety cabinet according to claim 7, characterized in that: The screw rod of the clamping bolt is configured with a limiting groove, and the end of the second locking bolt extends into the limiting groove.

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