Limiting structure of biological safety cabinet

Abstract

The utility model discloses a limiting structure of a biosafety cabinet, which belongs to the technical field of biosafety cabinets and is arranged on the biosafety cabinet, the biosafety cabinet comprises a cabinet body, a front cover and a safety door, the limiting structure comprises a connecting cover, a limiting part and a limiting part, the connecting cover is detachably arranged on the cabinet body, and an ultraviolet lamp is arranged on the inner side wall of the connecting cover; the cabinet body is provided with a sound-light alarm device which is electrically connected with the upper limit switch and the lower limit switch; the trapezoidal block is arranged on the front side surface of the safety door; according to the scheme, when the safety door is opened too high or too low, the upper limiting switch is in an off state, and the sound-light alarm device gives an alarm, so that the situation that external non-filtered air enters due to the fact that the safety door is too high is greatly avoided, and the risks of pollution and biological hazards are reduced; the phenomenon that the safety door is too low to influence the operation of workers is prevented, and the quality and effect of experimental operation can be ensured; and when the safety door is not pulled down to a designated position, the sound-light alarm device can also give an alarm, so that the protection effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of biological safety cabinets, and more particularly to a limiting structure of a biological safety cabinet. Background Art

[0002] A biological safety cabinet is a specially designed laboratory device used to handle materials that may contain infectious or toxic substances. It is typically used when conducting microbiology, cell biology, and other related experiments. It prevents harmful microorganisms or other biological materials from contaminating operators, the environment, and research materials by providing a protective environment.

[0003] The working window of a biosafety cabinet (BSC) is the area where operators conduct experimental work. It is an open area at the front of the cabinet. This window is typically equipped with a transparent barrier or door, also known as a safety door, to protect the interior from external contaminants without obstructing vision. The safety door can be pulled up and down, and friction keeps it stationary at any height.

[0004] However, there are currently no corresponding protective measures for the opening and closing of the safety door. When the safety door is opened too wide, the negative pressure in the safety cabinet is insufficient, which increases the possibility of external non-filtered air entering the working area, increasing the risk of cross-contamination and biological hazards, and the internal ultraviolet lamp will also cause harm to the staff; when the safety door is opened too small, it will affect the staff's experimental operations, which not only increases the difficulty of operation, but also affects the quality and effect of operation, while reducing work efficiency.

[0005] Therefore, it is necessary to provide a limiting structure for a biosafety cabinet to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a limiting structure of a biological safety cabinet to solve the above technical problems.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A limiting structure for a biological safety cabinet is provided on the biological safety cabinet. The biological safety cabinet includes a cabinet body, a front cover, and a safety door. The safety door can move up and down along the cabinet body, and includes:

[0009] A connecting cover is detachably mounted on the cabinet body, and an ultraviolet lamp is mounted on the inner side wall of the connecting cover;

[0010] An upper limit switch and a lower limit switch are respectively arranged on the inner side walls of the front cover and the connecting cover, and an audible and visual alarm device electrically connected to the upper limit switch and the lower limit switch is provided on the cabinet;

[0011] The trapezoidal block is arranged on the front side of the safety door and corresponds to the positions of the upper limit switch and the lower limit switch.

[0012] Furthermore, a safety line is provided at the front end of the cabinet, and a handle is provided at the front end of the safety door.

[0013] Furthermore, a protective component is provided at the front end of the cabinet to block the opened safety door, and the protective component is located below the safety line.

[0014] Furthermore, the protection component includes:

[0015] A fixed plate is provided at the front end of the cabinet, a protective barrier rod is movably passed through the fixed plate, and a pull plate is provided at one end of the protective barrier rod;

[0016] One end of the first elastic member is connected to the pull plate, and the other end is connected to the fixing plate.

[0017] Furthermore, a support rod is provided on the fixed plate, a U-shaped stopper is provided at the end of the support rod, and a limiting plate adapted to the U-shaped stopper is rotatably provided on the pull plate.

[0018] Furthermore, an inner cavity is provided inside the protection barrier rod, a buffer plate is slidably provided on the inner wall of the inner cavity, and an elastic structure connected to the buffer plate is provided in the inner cavity.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this solution, when the staff is performing experimental operations, the lower limit switch is in the disconnected state after pulling the safety door upwards, and the ultraviolet lamp will be turned off at this time, avoiding the current situation where the ultraviolet lamp is forgotten to be turned off before opening the safety door and causing harm to the staff; and when the safety door is opened too high or too low, the upper limit switch is in the disconnected state, and the sound and light alarm device will alarm, which greatly avoids the current situation where the safety door is too high and the negative pressure in the cabinet is insufficient, which increases the inflow of external non-filtered air, reducing the risk of cross contamination and biological hazards; it also prevents the safety door from being too low and affecting the staff's operation, which can ensure the quality and effect of the experimental operation and significantly improve work efficiency.

[0021] 2. In this solution, when the safety door is completely closed, the trapezoidal block will contact the lower limit switch, and the lower limit switch will close. At the same time, the ultraviolet lamp will turn on to disinfect the work surface and other surfaces inside the cabinet to reduce microbial contamination, which can minimize the potential risk to people. When the safety door is not pulled down to the specified position, the lower limit switch is in the disconnected state. At this time, the sound and light alarm device will alarm, avoiding the situation where the safety door is not closed properly due to mistakes, and the protection effect is good.

[0022] 3. In this solution, when the staff conducts experimental operations, the safety door moves to the specified height, and the protective component at this time will block the safety door, that is, the protective component will block the bottom of the safety door. When the staff conducts experimental operations in the cabinet, the protective component can prevent the safety door from suddenly falling due to a fault and causing harm to the staff, which can better protect the staff and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the external structure of the biosafety cabinet of the present utility model;

[0024] Figure 2 This is a partial structural diagram of the inner side of the front cover and the connecting cover of the utility model;

[0025] Figure 3 This is a schematic diagram of the partial structure of the cabinet after the connection cover is removed;

[0026] Figure 4 for Figure 3 A in the middle is an enlarged structural diagram;

[0027] Figure 5 This is a schematic diagram of the structure of the protective component on the cabinet of the utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the safety door of the utility model in the state of being pulled up for operation;

[0029] Figure 7 for Figure 6 The enlarged structural diagram at B in the middle;

[0030] Figure 8 This is a schematic diagram of a partial cross-sectional structure of the protective barrier rod of the present invention.

[0031] Description of the numbers in the figure:

[0032] 1. Cabinet body; 2. Front cover; 3. Safety door; 4. Connecting cover; 5. Ultraviolet lamp; 6. Upper limit switch; 7. Lower limit switch; 8. Trapezoidal block; 9. Safety line; 10. Handle; 11. Protective component; 111. Fixed plate; 112. Protective stopper; 113. Pull plate; 114. First elastic member; 12. Support rod; 13. U-shaped stopper; 14. Limiting plate; 15. Inner cavity; 16. Buffer plate; 17. Elastic structure; 171. Second elastic member; 172. Damper. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-8 A biosafety cabinet limit structure is provided on the biosafety cabinet. The biosafety cabinet includes a cabinet body 1, a front cover 2, and a safety door 3. The safety door 3 can move up and down along the cabinet body 1. The safety door 3 is a transparent door made of glass or acrylic panel. The structure includes: a connecting cover 4, which is detachably mounted on the cabinet body 1. An ultraviolet lamp 5 is provided on the inner side wall of the connecting cover 4; an upper limit switch 6 and a lower limit switch 7, which are respectively mounted on the inner side walls of the front cover 2 and the connecting cover 4. The cabinet body 1 is provided with an audible and visual alarm device electrically connected to the upper limit switch 6 and the lower limit switch 7; and a trapezoidal block 8, which is mounted on the front side of the safety door 3 and corresponds to the position of the upper limit switch 6 and the lower limit switch 7. The trapezoidal block 8 is made of nylon. The upper limit switch 6 and the lower limit switch 7 are both electrically connected to the audible and visual alarm device, and the ultraviolet lamp 5 is electrically connected to the lower limit switch 7. The ultraviolet lamp 5 is primarily used to disinfect the work surface and other surfaces inside the cabinet body 1 to reduce microbial contamination.

[0035] When the staff needs to perform experimental operations, they first pull the safety door 3 upward to move it up, and the safety door 3 will drive the trapezoidal block 8 to move up. At this time, the trapezoidal block 8 will be separated from the lower limit switch 7. At this time, the lower limit switch 7 is in the off state, and the ultraviolet lamp 5 will be turned off, thereby avoiding the current situation where the ultraviolet lamp 5 is forgotten to be turned off before opening the safety door 3 and causing harm to the staff. The protection is strong. When the safety door 3 is gradually moved up to the working height, as shown in the figure, Figure 6 When the safety door 3 is opened too high or too low, the trapezoidal block 8 does not contact the contacts of the upper limit switch 6, and the upper limit switch 6 is in the open state, and the sound and light alarm device will sound an alarm, thereby reminding the staff that the safety door 3 is opened at an incorrect height and needs to be adjusted. This greatly avoids the current situation where the safety door 3 is too high, resulting in insufficient negative pressure in the cabinet 1 and increased entry of external non-filtered air, reducing the risk of cross contamination and biohazards; it also prevents the safety door 3 from being too low and affecting the staff's operation, ensuring the quality and effect of the experimental operation and significantly improving work efficiency.

[0036] After the experimental operation is completed, when the safety door 3 needs to be pulled down to close, the trapezoidal block 8 on the safety door 3 disengages the upper limit switch 6. When the safety door 3 is completely closed, the trapezoidal block 8 contacts the lower limit switch 7, which closes. At this time, the safety door 3 is in the correct position and the sound and light alarm device is not triggered. At the same time, after the lower limit switch 7 is closed, the ultraviolet lamp 5 is turned on, thereby disinfecting the work surface and other surfaces inside the cabinet 1 to reduce microbial contamination, minimize potential risks to people, and maintain a sterile environment inside the cabinet 1, with good use effect. When the safety door 3 is not pulled down to the specified position, the lower limit switch 7 is in the disconnected state, and the sound and light alarm device will alarm, thereby avoiding the situation where the safety door 3 is not closed properly due to human error, and the protective effect is good.

[0037] A safety line 9 is provided at the front end of the cabinet 1, and a handle 10 is provided at the front end of the safety door 3. The safety line 9 on the cabinet 1 allows the operator to observe the operation more easily. When the safety door 3 is opened and moved to the position of the safety line 9, it is at the normal working height, which can reduce the operator's mistakes and more accurately move the safety door 3 to the corresponding operating height. The handle 10 makes it easier for the operator to move the safety door 3.

[0038] In this embodiment, preferably, please refer to Figure 1 、 Figure 3 and Figure 5-8 A protective component 11 is provided at the front end of the cabinet 1 for blocking the opened safety door 3. The protective component 11 is located below the safety line 9. When the staff needs to perform experimental operations, the safety door 3 is moved up and opened to a specified height. At this time, the safety door 3 is located at the corresponding position of the safety line 9. At this time, the protective component 11 will block the safety door 3, that is, the protective component 11 will block the bottom of the safety door 3. When the staff performs experimental operations in the cabinet 1, the protective component 11 can prevent the safety door 3 from suddenly falling due to a malfunction and causing harm to the staff, which can better protect the staff and has strong practicality.

[0039] In this embodiment, preferably, please refer to Figure 1 、 Figure 3 and Figure 5-8 The protective component 11 includes: a fixed plate 111, which is arranged at the front end of the cabinet 1, and a protective barrier rod 112 is movably passed through the fixed plate 111, and a pull plate 113 is provided at one end of the protective barrier rod 112; a first elastic member 114, one end of which is connected to the pull plate 113, and the other end is connected to the fixed plate 111. The first elastic member 114 in this application adopts a spring or other elastic element.

[0040] When the safety door 3 is to be moved, first pull the pull plate 113 to drive the protective barrier rod 112 to move, and stretch the first elastic member 114 to make the protective barrier rod 112 move outward, that is, away from the safety door 3. Then move the safety door 3. When the safety door 3 moves up to the specified height, release the pull plate 113 again. The first elastic member 114 will drive the protective barrier rod 112 to move to the initial position. At this time, the protective barrier rod 112 is partially located below the safety door 3, thereby blocking the safety door 3 and protecting the staff.

[0041] In this embodiment, preferably, please refer to Figure 5-7 , a support rod 12 is provided on the fixed plate 111, and a U-shaped stopper 13 is provided at the end of the support rod 12. A limiting plate 14 adapted to the U-shaped stopper 13 is rotatably provided on the pull plate 113. When the pull plate 113 is pulled, the pull plate 113 moves together with the limiting plate 14. When the limiting plate 14 is pulled to the corresponding position, the limiting plate 14 is rotated so that the limiting plate 14 is placed on the U-shaped stopper 13. Figure 5 state, thereby avoiding the situation that the staff needs to pull the pull plate 113 all the time by hand, which is more convenient to operate, saves time and effort, and can be operated by a single person, which can make the movement of the safety door 3 smoother.

[0042] In this embodiment, preferably, please refer to Figure 5-8 The protective barrier rod 112 has an inner cavity 15 formed inside. A buffer plate 16 is slidingly provided on the inner wall of the inner cavity 15. An elastic structure 17 connected to the buffer plate 16 is provided inside the inner cavity 15. When the staff is operating the experiment, if the safety door 3 suddenly drops due to a malfunction, the safety door 3 will first contact the buffer plate 16. The buffer plate 16 will press the elastic structure 17 under the force. The elastic structure 17 can absorb part of the force, that is, it can play a buffering role for the safety door 3, which can greatly prevent the safety door 3 from being damaged or broken due to excessive downward force, and has good protection.

[0043] The elastic structure 17 includes a second elastic member 171 and a damper 172. The second elastic member 171 is sheathed over the damper 172. The second elastic member 171 can be a spring or other elastic element. When the buffer plate 16 is subjected to force, it compresses the second elastic member 171 and the damper 172, absorbing and dissipating some of the energy. This reduces the vibration, impact, and movement of the buffer plate 16 after the force is applied, thereby improving the stability and safety of the safety door 3.

[0044] It should be understood that the examples and implementation methods described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes in which A and B are satisfied at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A limiting structure of a biological safety cabinet, arranged on the biological safety cabinet, wherein the biological safety cabinet comprises a cabinet body (1), a front cover (2) and a safety door (3), wherein the safety door (3) can move up and down along the cabinet body (1), and is characterized in that: include: A connecting cover (4) is detachably mounted on the cabinet (1), and an ultraviolet lamp (5) is mounted on the inner side wall of the connecting cover (4); An upper limit switch (6) and a lower limit switch (7) are respectively arranged on the inner side walls of the front cover (2) and the connection cover (4); and an audible and visual alarm device electrically connected to the upper limit switch (6) and the lower limit switch (7) is provided on the cabinet (1); A trapezoidal block (8) is provided on the front side of the safety door (3) and corresponds to the positions of the upper limit switch (6) and the lower limit switch (7).

2. The limiting structure of a biological safety cabinet according to claim 1, characterized in that: The front end of the cabinet (1) is provided with a safety line (9), and the front end of the safety door (3) is provided with a handle (10).

3. The limiting structure of a biological safety cabinet according to claim 2, characterized in that: The front end of the cabinet (1) is provided with a protective component (11) for blocking the opened safety door (3); the protective component (11) is located below the safety line (9).

4. The limiting structure of a biological safety cabinet according to claim 3, characterized in that: The protective component (11) comprises: A fixed plate (111) is arranged at the front end of the cabinet (1); a protective blocking rod (112) is movably passed through the fixed plate (111); and a pull plate (113) is provided at one end of the protective blocking rod (112); A first elastic member (114) has one end connected to the pull plate (113) and the other end connected to the fixing plate (111).

5. The limiting structure of a biological safety cabinet according to claim 4, characterized in that: A support rod (12) is provided on the fixed plate (111), a U-shaped stopper (13) is provided at the end of the support rod (12), and a limiting plate (14) adapted to the U-shaped stopper (13) is rotatably provided on the pull plate (113).

6. The limiting structure of a biological safety cabinet according to claim 4, characterized in that: An inner cavity (15) is provided inside the protection bar (112), a buffer plate (16) is slidably provided on the inner wall of the inner cavity (15), and an elastic structure (17) connected to the buffer plate (16) is provided in the inner cavity (15).

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