阅读说明：本技术 一种用于生物安全柜流入气流流速的检测装置及检测方法 (Detection device and detection method for flow velocity of inflow air of biological safety cabinet ) 是由 张�杰 李旖 汪洋 廖根清 梅启新 于 2020-07-22 设计创作，主要内容包括：本发明公开了一种用于生物安全柜流入气流流速的检测装置及检测方法,该检测装置包括支撑杆,支撑杆的一端竖直固定有第一夹板,支撑杆上穿设有第二夹板,第二夹板在支撑杆上滑动设置,第二夹板的一侧固定设有紧固装置,第一夹板与第二夹板之间设有气流检测装置,气流检测装置穿设在支撑杆上,所述气流检测装置包括连接板,连接板上方呈倒U型,连接板悬挂在支撑杆上,连接板上设有透明盒,透明盒内分布有水平气泡,支撑板下端固定有夹具,夹具下端口夹设有风速仪探棒。本发明装置结构简单,便于安装使用,该检测方法检测方便,节省检测时间,大大降低对检测人员的危害,且检测结果准确。(The invention discloses a detection device and a detection method for the flow velocity of inflow air flow of a biological safety cabinet, the detection device comprises a support rod, a first clamp plate is vertically fixed at one end of the support rod, a second clamp plate penetrates through the support rod, the second clamp plate is arranged on the support rod in a sliding mode, a fastening device is fixedly arranged on one side of the second clamp plate, an air flow detection device is arranged between the first clamp plate and the second clamp plate, the air flow detection device penetrates through the support rod, the air flow detection device comprises a connecting plate, the upper portion of the connecting plate is in an inverted U shape, the connecting plate is hung on the support rod, a transparent box is arranged on the connecting plate, horizontal air bubbles are distributed in the transparent box, a clamp is fixed at the lower end of the support plate. The device has simple structure, convenient installation and use, convenient detection, detection time saving, great reduction of harm to detection personnel and accurate detection result.)

1. The utility model provides a detection device for biosafety cabinet inflow air current velocity of flow, its characterized in that, it includes bracing piece (1), the one end of bracing piece (1) is vertical to be fixed with first splint (2), wears to be equipped with second splint (3) on bracing piece (1), and second splint (3) slide on bracing piece (1) and set up, and one side that first splint (2) were kept away from in second splint (3) is fixed and is equipped with fastener (4), be equipped with air current detection device (5) between first splint (2) and second splint (3), air current detection device (5) are worn to establish on bracing piece (1), are equipped with the scale of even continuous distribution on bracing piece (1), bracing piece (1) includes a plurality of sections extension bar (11), all wears to be equipped with stretch cord (12) in a plurality of extension bar (11), and the one end of stretch cord (12) is fixed on first splint (2), the other end of stretch cord (12) is fixed on the extension bar of right-hand member in a plurality of extension bars (11), air current detection device (5) are the type of falling U including connecting plate (6), connecting plate (6) top, and connecting plate (6) hang on bracing piece (1), are equipped with transparent box (7) on connecting plate (6), and horizontal bubble (8) have been distributed in transparent box (7), and connecting plate (6) lower extreme is fixed with anchor clamps (9), and the port presss from both sides and is equipped with anemoscope probe rod (10) under anchor clamps (9).

2. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: all be equipped with rubber buffer pad (20) on first splint (2) and second splint (3) the face in opposite directions, be equipped with the buffer pad on the splint inner wall of anchor clamps (9).

3. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: an elastic rope gasket (13) is arranged between the elastic rope (12) and the left side face of the first clamping plate (2), and one end of the elastic rope (12) penetrates through the elastic rope gasket (13) and is tied into an elastic rope knot (14).

4. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: the length inequality of each extension bar (11), 3 are no less than in the quantity of extension bar (11), all offer recess (15) that are used for holding the stretch cord at the right-hand member of every extension bar (11).

5. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: the transparent box (7) is fixed at the upper end of the connecting plate (6).

6. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 2, wherein: the connecting plate (6) is provided with a through hole, a transparent plate (18) is fixed in the through hole, the transparent plate (18) is located at the lower part of the transparent box (7), a center line (19) is carved on the transparent plate (18), and the center line (19) upwards extends to the upper end face of the connecting plate (6).

7. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: articulated between connecting plate (6) and anchor clamps (9) have two risers (21), articulated between two risers (21), riser (21) of upper end articulate on connecting plate (6), and riser (21) of lower extreme articulate on anchor clamps (9).

8. The apparatus for detecting the flow rate of an influent stream to a biosafety cabinet as claimed in claim 1, wherein: fastener (4) are the toper structure, including sleeve pipe (22) and adapter sleeve (16), on bracing piece (1) was worn to establish in sleeve pipe (22), fixed connection between sleeve pipe (22) and second splint (3), is equipped with helicitic texture on sleeve pipe (22), has seted up fastening groove (24) in the one end of keeping away from second splint (3) in sleeve pipe (22), and adapter sleeve (16) inner wall is equipped with the internal thread with sleeve pipe (22) matched with.

9. The method for detecting the flow rate of the airflow flowing into the biosafety cabinet as claimed in any one of claims 1 to 8 is characterized by comprising the following steps:

s1, fixing a detection device; splicing a support rod (1) and a plurality of extension rods according to the actual required length of a biological safety cabinet (23), hanging the redundant extension rods (11) at the right end of the support rod (1) through elastic ropes (12), placing the elastic ropes (12) in grooves (15) which are formed at the right end of each extension rod (11) and used for accommodating the elastic ropes, tightly attaching a first clamping plate (2) to the outer wall of one side of the biological safety cabinet (23), tightly attaching a second clamping plate (3) to the outer wall of the other side of the biological safety cabinet, keeping the support rod (1) in the horizontal direction, and screwing a fastening device (4);

s2, adjusting the detection device; clamping a probe rod of an anemoscope in a lower port of a clamp (9), hinging the upper end of the clamp on a vertical plate (21) at the lower end, sequentially hinging the vertical plate (21) at the upper end on a connecting plate (6), hanging the connecting plate (6) on a supporting rod (1), observing that the clamp (9) is moved left and right to ensure that corresponding scales on an intermediate line (19) and the supporting rod are superposed, observing whether a horizontal bubble (8) in a transparent box (7) is on the intermediate line (19) or not, unscrewing a fastening device (4) on a second clamping plate (3) if the horizontal bubble (8) is not on the intermediate line (19), finely adjusting the second clamping plate (3) and a first clamping plate (2) to ensure that the intermediate line (19) completely covers the horizontal bubble (8), and ensuring that the horizontal bubble (8) is on the intermediate line (19) when the clamp (9) is positioned at any point on the supporting rod (1), the leveling of the horizontal air bubble (8) is completed;

s3, detecting and collecting the airflow velocity of the first exhaust detection point; pulling an anemoscope probe, and determining the length required by a first row of measuring points by using the scales of the anemoscope probe or a supporting rod (1), wherein the first row of measuring points are arranged on a front window operation opening at the front end of the biological safety cabinet, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the first row of measuring points to the height distance of the whole operation opening is 4: 1; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the detection is stopped at a position close to the left side of the front window operation opening but not less than 100mm, the first row of detection points is completed, and corresponding data is recorded through the reading of the anemometer probe;

s4, detecting the airflow velocity of the second row of detection points; pulling the anemoscope probe, and determining the length required by a second row of detection points by using the scales of the anemoscope probe or the supporting rod (1), wherein the second row of detection points are arranged on a front window operation opening at the front end of the biological safety cabinet, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the second row of detection points to the height distance of the whole operation opening is 4: 3; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the position is close to the left side of the front window operation opening but not less than 100mm, detection is stopped, a second row of detection points are completed, and corresponding data are recorded through reading of an anemometer probe;

s5, retracting the checkout gear; after the detection is finished, loosening the fastening device (4) on the second clamping plate (3), taking down the clamp (9) and loosening the anemometer probe; unscrewing the fastening device (4), taking down the supporting rod (1), restoring the supporting rod (1) and the plurality of extension rods (11) into an original multi-section structure, folding the supporting rod (1) for standby, and sterilizing the biological safety cabinet (23).

Technical Field

The invention belongs to the field of medical biological protection equipment, and particularly relates to a detection device and a detection method for the flow velocity of inflow air flow of a biological safety cabinet.

Background

Biological Safety Cabinets (BSC), also known as negative pressure filtration fume hoods, are used primarily to prevent operator and environment exposure to bioaerosols generated during the experiment. The air flow speed and the like of the equipment need to be detected in the using process, when the air flow flows into the biological safety cabinet, the horizontal coordinate is positioned by a steel tape at the front window operation opening of the biological safety cabinet through a detector, the vertical coordinate is positioned by scales carried by a hand-held anemometer probe, the approximate position of each detection point is positioned in the air, and then the hand-held anemometer is used for detecting. When one point is detected, the last action positioning is manually repeated when the next point is detected, and then the detection is carried out. This poses several serious problems: 1) because the detection personnel need to hold the anemoscope for a long time to detect at the front window operation opening, the detection consumes long time, the contact chance between the detection personnel and the hazards in the biological safety cabinet is greatly increased, and the risk of causing harm to the detection personnel is increased; 2) the horizontal coordinate is positioned by a steel tape every time, the vertical coordinate is positioned by the scale of the hand-held anemograph probe, the consumed time is extremely long, the positioning accuracy is extremely low, and the reproducibility is completely avoided; 3) the work efficiency is low: the handheld anemoscope probe of measurement personnel, holding the anemoscope host computer with one hand, can't carry out the record and the detection of data simultaneously, this leads to carrying out the detection that the biosafety cabinet flowed in the wind speed in industry, must two people go on simultaneously, alone detects, alone record data.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a detection device and a detection method for the flow velocity of inflow air of a biosafety cabinet, which can improve the working efficiency and the detection accuracy and greatly reduce the harm to detection personnel.

In order to achieve the purpose, the invention adopts the following technical scheme:

a detection device for the flow rate of inflow air flow of a biological safety cabinet comprises a supporting rod, wherein a first clamping plate is vertically fixed at one end of the supporting rod, a second clamping plate penetrates through the supporting rod and is arranged on the supporting rod in a sliding manner, a fastening device is fixedly arranged on one side, away from the first clamping plate, of the second clamping plate, an air flow detection device is arranged between the first clamping plate and the second clamping plate and penetrates through the supporting rod, scales which are uniformly and continuously distributed are arranged on the supporting rod, the supporting rod comprises a plurality of extension rods, elastic ropes penetrate through the extension rods, one ends of the elastic ropes are fixed on the first clamping plate, the other ends of the elastic ropes are fixed on the extension rod at the rightmost end of the extension rods, the air flow detection device comprises a connecting plate, the upper portion of the connecting plate is inverted U-shaped, the connecting plate is hung on the supporting rod, and a transparent box, horizontal bubbles are distributed in the transparent box, a clamp is fixed at the lower end of the connecting plate, and an anemoscope probe is clamped at the lower port of the clamp.

All be equipped with the rubber buffer on first splint and the second splint face in opposite directions, can effectively protect biological safety cabinet to increase frictional force, increase the fastness that detection device is fixed and measured stability, be equipped with the buffer on the splint inner wall of anchor clamps and with better protection anemoscope probe.

An elastic rope gasket is arranged between the elastic rope and the left side face of the first clamping plate, one end of the elastic rope penetrates through the elastic rope gasket and is tied into an elastic rope knot, and the connection firmness of the elastic rope is improved.

The length inequality of each extension rod makes whole bracing piece be the multistage formula structure of inhomogeneous length to adapt to the measurement demand of different specification biosafety cabinets, 3 are no less than to the quantity of extension rod, all offer the recess 15 that is used for holding the stretch cord at the right-hand member of every extension rod, thereby make the stretch cord between the adjacent extension rod of back of bending, make things convenient for placing of unnecessary bracing piece, during the recess was arranged in to unnecessary part, whole bracing piece formed the type of falling L structure, practices thrift the space.

The transparent box is fixed at the upper end of the connecting plate.

The connecting plate is provided with a through hole, a transparent plate is fixed in the through hole and located at the lower part of the transparent box, a central line is carved on the transparent plate, and the central line upwards extends to the upper end face of the connecting plate.

Two vertical plates are hinged between the connecting plate and the clamp, the two vertical plates are hinged, the vertical plate at the upper end is hinged on the connecting plate, and the vertical plate at the lower end is hinged on the clamp.

The fastening device is of a conical structure and comprises a sleeve and a fastening sleeve, the sleeve is arranged on the supporting rod in a penetrating mode, the sleeve and the second clamping plate are fixedly connected or integrally arranged, a threaded structure is arranged on the sleeve, one end, far away from the second clamping plate, of the sleeve is provided with a fastening groove, and the inner wall of the fastening sleeve is provided with an internal thread matched with the sleeve.

A detection method of a detection device for the flow velocity of an inflow air flow of a biosafety cabinet specifically comprises the following steps:

s1, fixing a detection device; splicing the support rod and a plurality of extension rods according to the actual required length of the biological safety cabinet, hanging the redundant extension rods at the right end of the support rod through elastic ropes, placing the elastic ropes in grooves which are formed at the right end of each extension rod and used for accommodating the elastic ropes, tightly attaching a first clamping plate to the outer wall of one side of the biological safety cabinet, tightly attaching a second clamping plate to the outer wall of the other side of the biological safety cabinet, keeping the support rod in the horizontal direction, and screwing a fastening device;

s2, adjusting the detection device; clamping a probe of an anemoscope in a lower port of a clamp, hinging the upper end of the clamp on a vertical plate at the lower end, sequentially hinging the vertical plate at the upper end on a connecting plate, hanging the connecting plate on a supporting rod, observing that the clamp is moved left and right to enable corresponding scales on an intermediate line and the supporting rod to coincide, observing whether a horizontal bubble in a transparent box is on the intermediate line, loosening a fastening device on a second clamping plate if the horizontal bubble is not on the intermediate line, finely adjusting the second clamping plate and a first clamping plate to enable the intermediate line to completely cover the horizontal bubble, and finishing leveling of the horizontal bubble when the clamp is positioned at any point on the supporting rod;

s3, detecting and collecting the airflow velocity of the first exhaust detection point; pulling an anemoscope probe, and determining the length required by arranging a first row of measuring points on the measuring points of the biological safety cabinet by using the scales (or the scales on the supporting rod) on the anemoscope probe, wherein the first row of measuring points is arranged on a front window operation opening at the first front end, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the first row of measuring points to the height distance of the whole operation opening is 4: 1; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the detection is stopped at a position close to the left side of the front window operation opening but not less than 100mm, the first row of detection points is completed, and corresponding data is recorded through the reading of the anemometer probe;

s4, detecting the airflow velocity of the second row of detection points; pulling the anemoscope probe, and determining the length required by a second row of detection points by using the scales (or the scales on the supporting rod) on the anemoscope probe, wherein the second row of detection points are arranged on a front window operation opening at the front end of the biological safety cabinet, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the second row of detection points to the height distance of the whole operation opening is 4: 3; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the position is close to the left side of the front window operation opening but not less than 100mm, detection is stopped, a second row of detection points are completed, and corresponding data are recorded through reading of an anemometer probe;

s5, retracting the checkout gear; after the detection is finished, loosening the fastening device on the second clamping plate, taking down the clamp and loosening the anemoscope probe; unscrewing the fastening device, taking down the supporting rod, restoring the supporting rod and the plurality of extension rods into the original multi-section structure, folding the supporting rod for standby, and sterilizing the biological safety cabinet.

Compared with the prior art, the invention has the beneficial effects that:

1) the first clamping plate is matched with the second clamping plate, so that the inspection device can be installed on the biological safety cabinet, the installation is convenient, and the use is simple;

2) transparent box and bubble and bracing piece set up for the inspection device location is accurate, only needs once to fix a position and can accomplish one row of detection, can practice thrift check-out time, and the measured data is accurate: the method has the advantages that detection data are not different due to different methods of different detection engineers, the probe of the anemoscope is perpendicular to the front window operation opening only by first positioning, and the probe does not need to be adjusted again; the front, back, left, right, up and down displacement of the probe of the anemograph caused by the shake of hands of the detector does not exist;

3) the reproducibility is high: by using the detection device, each point is not roughly positioned in the front window operation opening any more, only the only positioning position of each point can be determined according to the operation method, and the obtained inspection result is accurate;

4) reducing the risk of biohazard: by using the device, the opportunity of direct contact between detection personnel and the biological safety cabinet is reduced, and the risk of biohazard is correspondingly reduced.

Drawings

Fig. 1 is a schematic structural diagram of the biological safety cabinet for measurement.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic structural view of the airflow detecting device.

Fig. 4 is a schematic view of the connection structure of the support rod.

Fig. 5 is a schematic view of the second clamping plate and the fastening device.

Fig. 6 is a schematic structural view of the support rod and the elastic cord.

Fig. 7 is a schematic structural view of the left side surface of the clamping plate.

Fig. 8 is a schematic structural view of the support bar.

Fig. 9 is a side view of a part of the structure on the web.

Wherein, 1-a support rod; 2-a first splint; 3-a second splint; 4-a fastening device; 5-an air flow detection device; 6-connecting plates; 7-a transparent box; 8-horizontal bubble; 9-a clamp; 10-anemometer probe; 11-extension bar; 12-elastic cord; 13-elastic cord gasket; 14-elastic rope knot; 15-a groove; 16-a fastening sleeve; 18-a transparent plate; 19-midline; 20-rubber cushion pad; 21-a riser; 22-a sleeve; 23-a biosafety cabinet; 24-fastening groove.

Detailed Description

As shown in fig. 1-9, the detecting device for detecting the flow rate of the inflow air of the biosafety cabinet in the embodiment comprises a supporting rod 1, a first clamping plate 2 is vertically fixed at one end of the supporting rod 1, a second clamping plate 3 penetrates through the supporting rod 1, the second clamping plate 3 is slidably arranged on the supporting rod 1, a fastening device 4 is fixedly arranged at one side of the second clamping plate 3 away from the first clamping plate 2, an air flow detecting device 5 is arranged between the first clamping plate 2 and the second clamping plate 3, the air flow detecting device 5 is arranged on the supporting rod 1 in a penetrating manner, scales which are uniformly and continuously distributed are arranged on the supporting rod 1, the supporting rod 1 comprises a plurality of extension rods 11, elastic ropes 12 are arranged in the extension rods 11 in a penetrating manner, one end of each elastic rope 12 is fixed on the first clamping plate 2, the other end of each elastic rope 12 is fixed on the rightmost extension rod of the extension rods 11, the air flow detecting, the upper part of the connecting plate 6 is in an inverted U shape, the connecting plate 6 is hung on the supporting rod 1, the connecting plate 6 is provided with a transparent box 7, horizontal bubbles 8 are distributed in the transparent box 7, a clamp 9 is fixed at the lower end of the connecting plate, and an anemoscope probe 10 is clamped at the lower port of the clamp 9.

Preferably, the first clamping plate 2 and the second clamping plate 3 are provided with rubber cushions 20 on their facing surfaces, and the inner wall of the clamping plate of the clamp 9 is provided with a cushion.

More preferably, in the present embodiment, an elastic cord pad 13 is disposed between the elastic cord 12 and the left side surface of the first clamping plate 2, one end of the elastic cord 12 passes through the elastic cord pad 13 and is tied to an elastic cord knot 14, so that the elastic cord 12 is fixed to the right side of the first clamping plate 2, and the operator adjusts the elastic cord knot 14 to increase the stability of the support bar 1.

As further preferred, the length of each extension bar 11 of this embodiment is unequal, the number of the extension bars 11 is not less than 3, a groove 15 for accommodating the elastic rope is formed at the right end of each extension bar 11, the redundant extension bars 11 can be hung at the right end of the support rod 1 through the elastic rope 12, and the elastic rope 12 is hooked in the groove 15, so that the storage is convenient, the space is saved, the elastic rope 12 can be prevented from shaking at the right end of the extension bar 11, the measurement stability is improved, the elastic rope 12 is prevented from being worn, and the service life of the elastic rope 12 is prolonged; when in use, the extension bar 11 is rotated to drive the groove 15 to rotate to the lower part, thereby facilitating the use of operators. In the embodiment, the supporting rod 1 and the extension rod 11 are made of aluminum alloy materials, and other parts are made of high-strength plastics, so that the device has enough strength and deformation resistance, the whole weight is light, and the special backpack can be filled after being folded, so that the carrying is convenient.

Preferably, the transparent box 7 of the present embodiment is fixed to the upper end of the connecting plate 6.

Preferably, the connecting plate 6 is provided with a through hole, a transparent plate 18 is fixed in the through hole, the transparent plate 18 is positioned at the lower part of the transparent box 7, an intermediate line 19 is carved on the transparent plate 18, and the intermediate line 19 extends upwards to the upper end face of the connecting plate 6. When the airflow detection device 5 is moved, the moving distance of the airflow detection device 5 can be determined according to the scale on the central line 19 and the support rod 1, the error of the measurement result is reduced, and the accuracy of the experiment result is ensured.

As further preferred, it has two risers 21 to articulate between this embodiment connecting plate 6 and the anchor clamps 9, articulates between two risers 21, and the riser 21 of upper end articulates on connecting plate 6, and the riser 21 of lower extreme articulates on anchor clamps 9, when anchor clamps 9 cliied the anemoscope probe, all can make the anemoscope probe be in vertical state, and hug closely biohazard safety cabinet 23 front window operation mouth, satisfy the biohazard safety cabinet 23 on various inclined planes.

As a further preferred, the fastening device 4 in this embodiment is a tapered structure, and includes a sleeve 22 and a fastening sleeve 16, the sleeve 22 is inserted into the supporting rod 1, the sleeve 22 is fixedly connected to the second clamping plate 3, the sleeve 22 is provided with a threaded structure, one end of the sleeve 22 away from the second clamping plate 3 is provided with fastening grooves 24 (at least three, in this embodiment, four fastening grooves symmetrically arranged around the supporting rod), and an inner wall of the fastening sleeve 16 is provided with an internal thread matching with the sleeve 22.

The detection method of the device for detecting the flow velocity of the inflow air of the biological safety cabinet comprises the following steps:

s1, fixing a detection device; splicing a support rod 1 and a plurality of extension rods according to the actual required length of a biological safety cabinet 23, hanging the redundant extension rods 11 at the right end of the support rod 1 through elastic ropes 12, placing the elastic ropes 12 in grooves 15 which are formed at the right end of the extension rods 11 and used for accommodating the elastic ropes, tightly attaching a first clamping plate 2 to the outer wall of one side of the biological safety cabinet 23, tightly attaching a second clamping plate 3 to the outer wall of the other side of the biological safety cabinet, keeping the support rod 1 in the horizontal direction, and screwing a fastening device 4;

s2, adjusting the detection device; clamping a probe rod of an anemoscope in a lower port of a clamp 9, hinging the upper end of the clamp on a vertical plate 21 at the lower end, sequentially hinging the vertical plate 21 at the upper end on a connecting plate 6, hanging the connecting plate 6 on a supporting rod 1, observing that the clamp 9 is moved left and right to enable a central line 19 to be superposed with corresponding scales on the supporting rod, observing whether a horizontal bubble 8 in a transparent box 7 is on the central line 19, if the horizontal bubble 8 is not on the central line 19, unscrewing a fastening device 4 on a second clamping plate 3, finely adjusting the second clamping plate 3 and a first clamping plate 2 to enable the central line 19 to completely cover the horizontal bubble 8, and when the clamp 9 is positioned at any point on the supporting rod 1, enabling the horizontal bubble 8 to be on the central line 19, and finishing the leveling of the horizontal bubble 8;

s3, detecting and collecting the airflow velocity of the first exhaust detection point; pulling an anemoscope probe, and determining the length required by a first row of measuring points by using scales (or scales on a support rod) on the anemoscope probe, wherein the first row of measuring points are arranged on a front window operation opening at the front end of the biological safety cabinet, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the first row of measuring points to the height distance of the whole operation opening is 4: 1; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the detection is stopped at a position close to the left side of the front window operation opening but not less than 100mm, the first row of detection points is completed, and corresponding data is recorded through the reading of the anemometer probe;

s4, detecting the airflow velocity of the second row of detection points; pulling the anemoscope probe, and determining the length required by a second row of detection points by using the scales (or the scales on the supporting rod) on the anemoscope probe, wherein the second row of detection points are arranged on a front window operation opening at the front end of the biological safety cabinet, and the ratio of the distance from the upper end of the front window operation opening at the front end of the biological safety cabinet to the second row of detection points to the height distance of the whole operation opening is 4: 3; the first detection point is close to the right side of the front window operation opening but not less than 100mm, each measurement point is spaced by about 100mm, detection is carried out from the first detection point until the position is close to the left side of the front window operation opening but not less than 100mm, detection is stopped, a second row of detection points are completed, and corresponding data are recorded through reading of an anemometer probe;

s5, retracting the checkout gear; after the detection is finished, loosening the fastening device 4 on the second clamping plate 3, taking down the clamp 9 and loosening the anemometer probe; unscrewing the fastening device 4, taking down the support rod 1, restoring the support rod 1 and the extension rods 11 into the original multi-section structure, folding the support rod 1 for standby, and sterilizing the biological safety cabinet 23. (TSI-9535 thermal anemometer is used in this example).

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made in the above embodiments by one of ordinary skill in the art within the scope of the present invention.