CN220027046U - Operation box with weighing function and biosafety cabinet - Google Patents

Abstract

The utility model relates to an operation box with a weighing function and a biological safety cabinet, and belongs to the technical field of biological experimental equipment. Including box and air supply filter, but the front shroud of opening and closing has been seted up to the box, and the bottom of box is table surface, is provided with the air intake grid on the table surface, and the air intake grid is located the front shroud below, and air supply filter is located box top box still is provided with the spacing inslot, is provided with weighing machine in the spacing inslot, and weighing machine from the top down has set gradually weighing platform, weighing sensor and shock attenuation platform. Through setting up weighing machine in the box and construct weighing to the sample, be located the inside weighing machine of spacing groove and construct and can effectively avoid taking box space, do not influence the circulation of gas in the biosafety cabinet, the management of weighing machine construct of being convenient for.

Description

Operation box with weighing function and biosafety cabinet

Technical Field

The utility model belongs to the technical field of biological experimental equipment, and particularly relates to an operation box with a weighing function and a biological safety cabinet.

Background

The biological safety cabinet is a box-type air purification negative pressure safety device capable of preventing aerosol from escaping from some dangerous or unknown biological particles in the experimental operation treatment process. The protective screen is widely applied to scientific research, teaching, clinical examination and production in fields of microbiology, biomedicine, genetic engineering, biological products and the like, and is the most basic safety protection equipment in the primary protective screen in laboratory biosafety. The biosafety cabinet serves as a primary barrier to provide a safe operating environment for a biohazardous sample. Weighing the potentially biohazardous materials such as infectious samples in a safety cabinet is also a dangerous operation.

In the prior art, the biosafety cabinet consists of a box body and a working platform, and in order to weigh an experimental sample in the experimental process, a balance is arranged on the working platform to weigh the living beings in the traditional method.

However, in the method, the balance is directly placed in the biosafety cabinet, so that the box space is occupied, the ventilation of the biosafety cabinet is affected, the daily disinfection is not facilitated, and the balance is troublesome to manage.

Disclosure of Invention

Aiming at the problems, the utility model provides the operation box with the weighing function and the biosafety cabinet which are convenient to clean and do not occupy the box body space.

In a first aspect, an operation box with weighing function, including box and air supply filter, but the front shroud of switching has been seted up to the box, and the bottom of box is table surface, is provided with the air intake grid on the table surface, and the air intake grid is located the front shroud below, and air supply filter is located box top box still is provided with the spacing inslot, is provided with weighing machine in the spacing inslot, weighing machine from the top down has set gradually weighing table, weighing sensor and shock attenuation platform.

In the above optional technical solution, the device further comprises a signal acquisition module, a control module and a display module, wherein the control module is respectively connected with the signal acquisition module and the display module, and the signal acquisition module is connected with the weighing sensor; the signal acquisition module, the control module and the display module are all located in the shell, and the shell is located inside the box.

In the above-mentioned optional technical scheme, the spacing groove is located on the table surface, and the notch of spacing groove is parallel with the platform of weighing, and the platform of weighing is parallel with table surface's upper surface.

In the above-mentioned optional technical scheme, the spacing groove is located the box lateral wall, and weighing machine constructs and spacing groove sliding connection in the horizontal direction.

In the above-mentioned alternative technical scheme, a limit mechanism for preventing the weighing mechanism from sliding off is arranged between the weighing mechanism and the limit groove;

the limiting mechanism comprises a first limiting block and a second limiting block, the first limiting block is fixedly connected with the weighing mechanism, the second limiting block is fixedly connected with the inner wall of the limiting groove, and when the weighing mechanism slides out of the limiting groove, the second limiting block is clamped with the first limiting block.

In the above-mentioned alternative technical scheme, two stop gear symmetry sets up in weighing machine constructs both sides.

In the above-mentioned alternative technical scheme, fixedly connected with handle on weighing mechanism's the lateral wall, the handle is used for pushing back or pulling out weighing mechanism from the spacing inslot.

In the above alternative solution, the opening angle of the front cover plate is 0-125 degrees.

In a second aspect, a biosafety cabinet includes a cabinet body, the cabinet body is internally provided with the operation box with weighing function according to the first aspect, and a closed circulation air channel is formed between the cabinet body and the cabinet body.

In the above-mentioned optional technical scheme, the cabinet body top is provided with the filter of airing exhaust, and the air in the circulation wind channel is discharged to the filter of airing exhaust, and the air in the circulation wind channel is sent into the box inside to the air supply filter.

It can be understood by those skilled in the art that the utility model comprises a box body and an air supply filter, wherein the box body is provided with a front cover plate which can be opened and closed, the bottom of the box body is a workbench surface, an air inlet grille is arranged on the workbench surface, the air inlet grille is positioned below the front cover plate, the air supply filter is positioned at the top of the box body, the box body is further provided with a limit groove, a weighing mechanism is arranged in the limit groove, and the weighing mechanism is sequentially provided with a weighing table, a weighing sensor and a damping table from top to bottom. Through setting up weighing machine in the box and construct weighing to the sample, be located the inside weighing machine of spacing groove and construct and can effectively avoid taking box space, do not influence the circulation of gas in the biosafety cabinet, the management of weighing machine construct of being convenient for.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a schematic diagram of the structure of the operation box with weighing function and the biosafety cabinet provided by the utility model;

FIG. 2 is a schematic view of a weighing mechanism provided by the utility model at the bottom of an operation box;

FIG. 3 is a schematic view of a weighing mechanism provided by the utility model on a side wall of an operation box;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is a top view of a spacing mechanism in the weighing mechanism provided by the present utility model;

fig. 6 is a schematic block diagram of the present utility model.

Reference numerals illustrate: 100-a cabinet body; 110-a circulating air duct; 200-an exhaust filter; 300-air supply filter; 400-an air inlet grid; 500-a weighing mechanism; 510-a weighing station; 520-a load cell; 530-a shock absorbing table; 540-handle; 550-limit groove; 560-a limiting mechanism; 561-first stopper; 562-a second limiting block; 600-box body; 610—a countertop; 620—front cover plate; 700-housing.

Specific embodiments of the present utility model have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "inner", "outer", "upper", "bottom", "front", "rear", etc., if any, are based on those shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As described in the background art, the biosafety cabinet is used as a biological laboratory and a barrier, and plays a vital role in biosafety protection, in the prior art, the biosafety cabinet is composed of a box body and a working platform, and in order to weigh in the experiment, a balance is arranged on the working platform to weigh the living beings in the traditional method.

However, in the method, the balance is directly placed in the biosafety cabinet, so that the box space is occupied, the ventilation of the biosafety cabinet is affected, the daily disinfection is not facilitated, and the balance is troublesome to manage. Therefore, the weighing mechanism and the biosafety cabinet which are convenient to clean and do not occupy the space of the box body are provided.

As shown in FIG. 1, FIG. 1 is a schematic structural diagram of an operation box with weighing function and a biosafety cabinet provided by the utility model; the air supply filter comprises a box body 600 and an air supply filter 300, wherein a front cover plate 620 capable of being opened and closed is arranged on the box body 600, a workbench surface 610 is arranged at the bottom of the box body 600, an air inlet grille 400 is arranged on the workbench surface 610, the air inlet grille 400 is arranged below the front cover plate 620, and the air supply filter 300 is arranged at the top of the box body 600.

The box 600 is also provided with a limit groove 550, a weighing mechanism 500 is arranged in the limit groove 550, and the weighing mechanism 500 is sequentially provided with a weighing table 510, a weighing sensor 520 and a damping table 530 from top to bottom.

Through setting up weighing machine construct 500 in box 600 and weighing the sample, be located the inside weighing machine construct 500 of spacing groove 550 and can effectively avoid taking box 600 space, do not influence the circulation of the interior gas of biosafety cabinet, the management of weighing machine construct 500 of being convenient for.

The load cell 520 may be of a photoelectric type, a hydraulic type, a capacitive type, or an electromagnetic type.

When the hydraulic weighing sensor is acted by the gravity P of the measured object, the pressure of hydraulic oil is increased, and the degree of the increase is in direct proportion to the P. And measuring the pressure increase value to determine the mass of the measured object. The hydraulic sensor has simple and firm structure and large measuring range, but the accuracy is generally not more than 1/100.

The electromagnetic force type weighing sensor works by utilizing the principle that the load on the bearing table is balanced with electromagnetic force. When the load-bearing table is provided with a measured object, one end of the lever is inclined upwards; the photoelectric element detects the inclination signal, and the inclination signal flows into the coil after being amplified to generate electromagnetic force, so that the lever is restored to a balanced state. The current generating electromagnetic balance force is digitally converted, and the measured object quantity can be determined.

The electromagnetic force sensor has high accuracy which can reach 1/2000-1/60000, but the weighing range is only between tens of milligrams to 10 kilograms.

Because the sample in this embodiment is lighter, the electromagnetic force sensor and the hydraulic sensor with higher precision can be preferentially adopted, and the determination can be also performed according to the actual operation requirement, and other sensors are not described here.

Illustratively, the vibration-damping platform 530 in the weighing mechanism 500 can control vibration of the weighing sensor 520, so that experiment stress is uniform; the adverse effect generated by calculation errors of the center position of the machine equipment is reduced; the center of the system position is lowered, and the experimental stability is improved; the experimental precision reduction caused by other external forces is reduced; error caused by co-vibration in the experimental process is prevented; acting as a local absorber preventing noise from passing to the ground.

In the above technical solution, errors are effectively avoided by the high-precision weighing sensor 520 and the shock absorbing platform 530, and the weighing accuracy is improved.

In the above technical solution, the size of the limiting groove 550 is adapted to the size of the weighing mechanism 500, and in the actual design process, the size of the limiting groove 550 should be slightly larger than the overall size of the weighing mechanism 500, so as to save installation space.

When the weighing mechanism 500 is placed in the limit groove 550, the gap between the limit mechanism 560 and the limit groove 550 is reduced as much as possible, so that the animal sample hair is prevented from falling into the gap, and the cleaning is not facilitated.

In the above alternative solution, as shown in fig. 6, fig. 6 is a schematic block diagram of the present utility model. The weighing sensor comprises a signal acquisition module, a control module and a display module, wherein the control module is respectively connected with the signal acquisition module and the display module, and the signal acquisition module is connected with the weighing sensor; the signal acquisition module, the control module and the display module are all located in the shell 700, and the shell 700 is located inside the box 600.

The weighing sensor 520 converts the received weight information into an electric signal and transmits the electric signal to the signal acquisition module, the signal acquisition module transmits the electric signal to the control module, the electric signal is transmitted to the display screen of the display module through the control module, and the display screen displays the quality of the received experimental sample.

In the above technical solution, the device further includes a temperature sensor, where the temperature sensor is connected to the control module, and the temperature sensor is used to detect the temperature of the box 600.

In the above technical solution, the humidity sensor is further included, and the humidity sensor is connected with the control module and is used for detecting the humidity of the box 600.

The temperature of the box 600 is generally controlled to be 10-30 ℃ and the humidity is controlled to be less than 75% according to the operation environment requirements of experimental samples. When the temperature or humidity does not meet the experimental requirements, the temperature and humidity of the box 600 can be controlled by a physical mode.

In this embodiment, four control keys are further disposed on the display screen, and the four control keys are respectively peeled, accumulated, stored and cleared, and are all connected with the control module, and the control module is used for controlling the output of weight data to be conventional in the prior art, so that the utility model is not repeated.

In the above alternative solution, as shown in fig. 2, fig. 2 is a schematic structural diagram of the weighing mechanism provided by the present utility model at the bottom of the operation box, where the limit groove 550 is located on the table top 610, the notch of the limit groove 550 is parallel to the weighing table 510, and the weighing table 510 is parallel to the upper surface of the table top 610.

The limit groove 550 arranged on the workbench 610 is used for embedding the weighing mechanism 500 into the workbench 610, so that the occupation of the weighing mechanism 500 in the box 600 is effectively reduced, and the ventilation of air is facilitated.

Meanwhile, the embedded weighing mechanism 500 can effectively reduce the management of the weighing mechanism 500, the problem of access of the weighing mechanism is not needed to be considered, and the labor cost is reduced. And the embedded weighing mechanism 500 can also effectively avoid the pollution of harmful substances in the box body 600, thereby being beneficial to the disinfection of the box body 600.

For convenience of subsequent maintenance and cleaning, the weighing platform 510 and the weighing sensor 520 are detachably connected, specifically, bolts are arranged between the weighing platform 510 and the weighing sensor 520.

It should be noted that when the limit slot 550 is located on the countertop 610, the limit slot 550 may be located at the middle or edge of any countertop 610.

To avoid false triggering of the weighing mechanism 500 during operation, it is preferable to place the limit slot 550 close to the edge, and the position may be adjusted according to actual requirements.

In the above technical scheme, the weighing table 510 and the working table 610 are made of sterile plates, so that various germs can be effectively prevented from spreading, various pollution sources are avoided, and a healthier, sanitary and safer environment is provided for experiments.

In the above technical solution, a waste bin is also installed inside the case 600 for temporarily disposing the harmful waste generated during the operation.

In the above technical solution, a tool box is further installed inside the box 600, for storing tools that need to be used in the operation process.

In the above alternative solution, as shown in fig. 3, fig. 3 is a schematic structural diagram of the weighing mechanism provided by the present utility model on the side wall of the operation box. The limit groove 550 is located on the side wall of the box 600, and the weighing mechanism 500 is slidably connected with the limit groove 550 in the horizontal direction.

In this embodiment, when the sample is to be weighed, the weighing mechanism 500 is pulled out of the limit slot 550; when the weighing is completed, the weighing mechanism 500 is pushed back to the limit groove 550. The structure differs from the limit groove 550 mounted on the countertop 610 in that the side-mounted limit groove 550 opens toward the front cover 620.

To reduce the effect of the weighing mechanism 500 on the airflow within the housing 600, the weighing mechanism 500 may be located on a side wall proximate to the countertop 610.

In the above-mentioned alternative solution, since the weighing mechanism 500 slides out of the limit groove 550 during the process of pulling out the weighing mechanism 500, a limit mechanism 560 for preventing the weighing mechanism 500 from sliding down is provided between the weighing mechanism 500 and the limit groove 550; the weighing mechanism 500 is restrained from sliding within the restraint slot 550 by the restraint mechanism 560.

As shown in fig. 4, fig. 4 is an enlarged view of a position-limiting mechanism 560 in the present embodiment, which is an enlarged view of a position-limiting mechanism a in fig. 3; the limiting mechanism 560 comprises a first limiting block 561 and a second limiting block 562, the first limiting block 561 is fixedly connected with the weighing mechanism 500, the second limiting block 562 is fixedly connected with the inner wall of the limiting groove 550, and when the weighing mechanism 500 slides out of the limiting groove 550, the second limiting block 562 clamps the first limiting block 561.

Through the cooperation between first stopper 561 and the second stopper 562, can effectively avoid weighing machine 500 landing, weighing machine 500 has carried out effectual protection.

The first stopper 561 and the second stopper 562 are both rectangular. When the weighing mechanism 500 is pulled out of the limit slot 550, the weighing platform 510 of the weighing mechanism 500 should be located entirely outside of the limit slot 550.

In the above alternative solution, as shown in fig. 5, fig. 5 is a top view of a limiting mechanism in a weighing mechanism provided by the present utility model, and two limiting mechanisms 560 are symmetrically disposed on two sides of the weighing mechanism 500.

The limiting mechanisms 560 on two sides simultaneously limit the weighing mechanism 500, so that the weighing mechanism 500 is more stable. The first limit machine block 561 may be separately connected to the weighing table 510, the weighing sensor 520, and the shock absorbing table 530, or may be sequentially connected to two of the three components.

In the above alternative solution, a handle 540 is fixedly connected to a side wall of the weighing mechanism 500, and the handle 540 is used to push back or pull out the weighing mechanism 500 from the limit slot 550.

The shape of the handle 540 is round or square, and the handle 540 is made of rubber.

In the above alternative, the front cover 620 may be opened at an angle of 0-125 degrees.

In this embodiment, in order to facilitate the operation of the staff, the side of the case 600 close to the staff is provided with an inclined plane, the inclined plane angle is 60 degrees, and when the front cover 620 is opened, people can control the opening angle of the front cover 620 according to the line of sight angle.

The utility model also provides a biosafety cabinet, which comprises a cabinet body 100, wherein an operation box with a weighing function is arranged in the cabinet body 100, and a closed circulating air channel 110 is formed between the cabinet body 600 and the cabinet body 100.

The circulation duct 110 may be a specially-separated pipe, or may be an enclosed space isolated from the case 600 and the cabinet 100, and the gas circulation in the biosafety cabinet is mainly achieved through the circulation duct 110.

In the above-mentioned alternative solution, the top of the cabinet 100 is provided with the exhaust filter 200, the exhaust filter 200 exhausts the air in the circulation duct 110, and the air supply filter 300 sends the air in the circulation duct 110 into the interior of the cabinet 600.

In the present embodiment, the fan in the blower filter 300 blows air into the inside of the cabinet 600 from the downstream side of the circulation duct 110, and the air in the cabinet 600 is discharged into the upstream side of the circulation duct 110 by the grill on the table 610, thus being circulated.

The exhaust filter 200 is positioned at the downstream of the circulation duct 110, and filters the harmful gas in the circulation duct 110 to be exhausted to the outside.

During use of the safety cabinet, the exhaust filter 200 or the air supply 300 filter is opened according to the working requirements.

Since the air in the cabinet 600 forms a sink flow, i.e., a vertical flow layer, by the air supply filter 300, and maintains a velocity of not less than 0.3 m/s. Thereby ensuring that the external air entering at the front cover 620 directly enters the air inlet grille 400 under the action of the vertical flow layer, and ensuring the cleanliness of the interior of the case 600.

Illustratively, the air supply filter 300 and the air exhaust filter 200 are HEPA filters, which are commonly called High Efficiency Particulate Air Filter, which are frames made of special fireproof materials, wherein the frames are partitioned into grids by corrugated aluminum sheets, and emulsified glass fiber submicron particles are filled in the frames.

The HEPA filter is mainly used for filtering out organisms such as bacteria and viruses in the air, so that the organisms such as the bacteria and the viruses can be prevented and controlled, and the infection transmission of related diseases is caused. HEPA filtration systems are also used in medical applications to combine with high energy UV modules to kill viruses and living bacteria in the filter media. HEPA filters rated HEPA unit effective rate of 99.995% are used to control diseases transmitted by bacteria, viruses or other harmful particulate matter in the air. The safety of operators can be effectively protected, and the filtered air is directly discharged into the air without causing pollution.

The air inlet of the air supply filter 300 is provided with a prefilter cover or prefilter, so that the air enters the HEPA filter after prefilter purification, and the service life of the HEPA filter can be prolonged.

In the above technical scheme, the top of the box 600 is further provided with an illuminating lamp and an ultraviolet lamp, the illuminating lamp is used for ensuring that the box 600 has certain brightness, the ultraviolet lamp is used for disinfecting the box 600, and the ultraviolet lamp can disinfect in the operation process or after the operation is finished.

Illustratively, the lamps and UV lamps are all in groups 3-5.

Illustratively, because the ultraviolet lamp may generate certain harmful radiation to the human body when the ultraviolet lamp is utilized for sterilization, the front cover plate 620 adopts a radiation-proof glass plate, and the radiation of the ultraviolet lamp can be effectively avoided while the operator can observe through the radiation-proof glass plate, so that the health of the operator is protected.

It should be noted that in order to prevent the disturbance of the air flow, the apparatus must not be installed in the passage of the person and the biosafety cabinet must not be slid so close to the door or window of the laboratory that the front window is facing, or is moving away from the person, where the articles flow and possibly disrupt the air flow.

The steps of sample treatment by the biosafety cabinet in the technical scheme are as follows:

1. and (5) switching on the power supply of the biosafety cabinet.

2. Putting on clean experiment work clothes, cleaning hands, and comprehensively wiping the work platform with 70% alcohol or other disinfectants.

3. The front cover 620 is opened and the test article is placed in the case 600 as required.

4. Closing the glass door, opening the power switch, and if necessary, opening the ultraviolet lamp to disinfect the surface of the experimental object.

5. After the disinfection is finished, the safe cabinet is set to be in a working state, and the glass door is opened, so that the air supply filter 300 and the air exhaust filter 200 normally operate to form vertical laminar flow.

6. The device can be used after the self-cleaning process is finished and the operation is stable, and when weighing is needed, the experimental object is placed on the weighing mechanism 500 for weighing.

7. After the work is completed, the waste is taken out, and the working platform in the cabinet is wiped by 70% alcohol. The airflow is maintained for a period of time to expel the work area contaminants.

8. Closing the front cover 620, closing the fluorescent lamp, and opening the ultraviolet lamp for disinfection in the cabinet.

9. And after the disinfection is finished, the power supply is turned off.

In the biosafety cabinet according to the embodiment, when the biosafety cabinet is used, the box 600 forms a vertical flow layer under the action of the air supply filter 300, and the weighing mechanism 500 located in the limit groove 550 in the box 600 does not affect the vertical flow layer. Therefore, the sample can be effectively protected from being polluted, and the air in the box body 600 can not escape out, so that the body of an operator is endangered.

While the present utility model has been described with reference to the preferred embodiments shown in the drawings, it will be readily understood by those skilled in the art that the scope of the utility model is not limited to those specific embodiments, and the above examples are only for illustrating the technical solution of the utility model, not for limiting it; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The operation box with the weighing function is characterized by comprising a box body and an air supply filter, wherein the box body is provided with a front cover plate capable of being opened and closed, the bottom of the box body is a workbench surface, an air inlet grille is arranged on the workbench surface and is positioned below the front cover plate, and the air supply filter is positioned at the top of the box body;

the box still is provided with the spacing inslot, be provided with weighing machine in the spacing inslot, weighing machine constructs from the top down and has set gradually weighing table, weighing sensor and shock attenuation platform.

2. The operation box with the weighing function according to claim 1, further comprising a signal acquisition module, a control module and a display module, wherein the control module is respectively connected with the signal acquisition module and the display module, and the signal acquisition module is connected with the weighing sensor;

the portable electronic device further comprises a shell, wherein the signal acquisition module, the control module and the display module are all located in the shell, and the shell is located in the box.

3. The operation box with weighing function according to claim 2, wherein the limit groove is located on the table top, a notch of the limit groove is parallel to the weighing table, and the weighing table is parallel to an upper surface of the table top.

4. The operation box with weighing function according to claim 1, wherein the limit groove is located on the side wall of the box body, and the weighing mechanism is slidably connected with the limit groove in a horizontal direction.

5. The operation box with the weighing function according to claim 4, wherein a limiting mechanism for preventing the weighing mechanism from sliding down is arranged between the weighing mechanism and the limiting groove;

the limiting mechanism comprises a first limiting block and a second limiting block, the first limiting block is fixedly connected with the weighing mechanism, the second limiting block is fixedly connected with the inner wall of the limiting groove, and when the weighing mechanism slides out of the limiting groove, the second limiting block clamps the first limiting block.

6. The operation box with weighing function according to claim 5, wherein two of the limit mechanisms are symmetrically arranged on both sides of the weighing mechanism.

7. The operation box with weighing function according to claim 6, wherein a handle is fixedly connected to a side wall of the weighing mechanism, and the handle is used for pushing back or pulling out the weighing mechanism from the limit groove.

8. The operating box with weighing function according to any one of claims 1-7, characterized in that the opening angle of the front cover plate is 0-125 degrees.

9. A biosafety cabinet comprising a cabinet body, wherein an operation box with a weighing function as claimed in any one of claims 1-8 is arranged in the cabinet body, and a closed circulating air channel is formed between the box body and the cabinet body.

10. The biosafety cabinet according to claim 9, wherein an exhaust filter is provided at a top of the cabinet body, and the exhaust filter exhausts air in the circulating air duct.