Device for assisting in detecting downstream leakage rate of high-efficiency filter of biological safety cabinet

Abstract

The utility model relates to a device for assisting in detecting the downstream leakage rate of an efficient filter of a biological safety cabinet, which comprises a movable lifting platform part, an X-direction movable seat part, a cantilever beam part, a Y-direction movable seat part, a photometer clamping mechanism and a controller, the X direction is the left-right direction, and the Y direction is the front-back direction; the X-direction moving seat part is in sliding connection with the moving lifting platform part in the X direction, the cantilever beam part is in sliding connection with the X-direction moving seat part in the Y direction, and a locking mechanism is arranged between the cantilever beam part and the X-direction moving seat part; the Y-direction moving seat part is slidably connected with the cantilever beam part along the Y direction, and the photometer clamping mechanism is arranged on the Y-direction moving seat part; by adjusting the suspension length of the cantilever beam part and adjusting the positions of the left induction piece, the right induction piece and the rear induction piece, the limiting boundary of automatic scanning is set, and the automatic scanning device is suitable for biological safety cabinets of various sizes and models; the integrality is good, and the anti-disturbance performance is good.

Description

Technical Field

[0001] This utility model belongs to the field of biosafety cabinet testing technology, specifically relating to a device for assisting in the detection of downstream leakage rate of high-efficiency filters in biosafety cabinets. Background Technology

[0002] The method for detecting the leakage rate downstream of the HEPA filter in a biosafety cabinet is generally as follows: a photometer is manually held by hand or held in place by an auxiliary device, with the photometer probe about 20mm away from the top air supply surface of the biosafety cabinet, and a full scan is performed using a meandering straight line.

[0003] Because manual handheld photometer scanning has drawbacks such as uneven scanning speed and large vertical shaking, testing personnel generally prefer to use auxiliary devices to hold the photometer. By manipulating the auxiliary device, the photometer is moved at a constant speed along a meandering straight line. For example, Chinese utility model patent with announcement number CN210221437U discloses an auxiliary testing device for biosafety cabinet filters.

[0004] The aforementioned existing technology also has the following drawbacks:

[0005] (1) Two longitudinal guide rails need to be laid parallel on the biosafety cabinet platform. Parallelism needs to be checked during the laying process, which is a lot of work. After the laying is completed, there is no mutual fixing mechanism between the guide rails and the biosafety cabinet, and the longitudinal guide rails have poor anti-disturbance properties.

[0006] (2) In order to adapt to different models of biosafety cabinets, the longitudinal guide rails and crossbeams are spliced ​​to adjust the size. In this way, the size change is not stepless and the models that can be adapted are limited. Utility Model Content

[0007] The technical problem to be solved by this invention is to overcome the shortcomings of the existing technology and provide a device for assisting in the detection of downstream leakage rate of high-efficiency filters in biosafety cabinets.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0009] A device for assisting in detecting the downstream leakage rate of a biosafety cabinet's high-efficiency filter includes a movable lifting platform, an X-axis movable base, a cantilever beam, a Y-axis movable base, a photometer clamping mechanism, and a controller. The X-axis is the left-right direction, and the Y-axis is the front-back direction.

[0010] The movable lifting platform includes a lifting platform surface and an X-axis movable seat part that is slidably connected to the lifting platform surface along the X-axis. The movement of the X-axis movable seat part along the X-axis is driven by a motor X. A left limit proximity switch and a right limit proximity switch are fixedly installed on the X-axis movable seat part. A left mounting bracket and a right mounting bracket are fixedly installed on the lifting platform surface. A left sensor and a right sensor are respectively installed on the left mounting bracket and the right mounting bracket, and both are adjustable in position along the X-axis. The left sensor is used to sense the left limit proximity switch, and the right sensor is used to sense the right limit proximity switch.

[0011] The cantilever beam section and the X-direction moving seat section are slidably connected along the Y direction, and a locking mechanism is provided between the cantilever beam section and the X-direction moving seat section;

[0012] The Y-axis moving base and the cantilever beam are slidably connected along the Y direction. The movement of the Y-axis moving base along the Y direction is driven by the motor Y. A rear proximity switch and a front proximity switch are fixedly installed on the Y-axis moving base. A front sensing element and a rear mounting bracket are fixedly installed on the cantilever beam. The rear sensing element is set on the rear mounting bracket and its position is adjustable along the Y direction. The front sensing element is used to sense the front proximity switch, and the rear sensing element is used to sense the rear proximity switch.

[0013] The photometer clamping mechanism is located on the Y-axis moving base and is used to clamp the aerosol photometer probe. The left limit proximity switch, the right limit proximity switch, and the front proximity switch are all connected to the controller, and the actions of motors X and Y are controlled by the controller.

[0014] Furthermore, the X-direction movable seat is slidably connected to the lifting platform along the X direction as follows: the lifting platform has parallel guide rails X and racks X; the X-direction movable seat includes a movable seat X, and a slider X is provided on the movable seat X; the guide rails X and the slider X are matched to achieve a linear sliding connection; the motor X is fixedly connected to the movable seat X; the output shaft of the motor X is fixedly connected to a gear X; and the gear X meshes with the rack X for transmission.

[0015] Furthermore, the cantilever beam section and the X-direction moving seat section are slidably connected in the Y direction as follows: the cantilever beam section includes a cantilever beam, and a guide rail YD is fixedly provided at the bottom of the cantilever beam. The guide rail YD matches the slider YD to achieve a linear sliding connection, and the slider YD is fixedly connected to the X-direction moving seat section.

[0016] Furthermore, the locking mechanism includes a guide rail clamp, which is fixedly connected to the X-direction moving seat portion, and the guide rail clamp is used to clamp the guide rail YD.

[0017] Furthermore, the Y-direction moving seat part and the cantilever beam part are slidably connected in the Y direction as follows: a guide rail YU and a rack Y are fixedly provided on the cantilever beam. The guide rail YU and the slider YU are matched to achieve a linear sliding connection. The slider YU is fixedly connected to the Y-direction moving seat part. The motor Y is fixedly connected to the Y-direction moving seat part. The output shaft of the motor Y is fixedly connected to a gear Y. The gear Y meshes with the rack Y for transmission.

[0018] Furthermore, the photometer clamping mechanism includes a fixed plate fixedly connected to the Y-axis movable seat portion, a fixed chuck and a bolt pull block both fixedly connected to the fixed plate, a movable chuck disposed between the fixed chuck and the bolt pull block and slidably connected to the fixed plate, a bolt screwed to the bolt pull block, and a bolt rotatably connected to the movable chuck.

[0019] The beneficial effects that this utility model can achieve are as follows:

[0020] (1) The locking mechanism is used to fix the cantilever beam and the X-direction moving seat to each other, thereby adjusting the cantilever beam length; and by adjusting the position of the left sensor, right sensor and rear sensor, the automatic scanning limit boundary is set, which is compatible with biosafety cabinets of various sizes and models and has strong universality.

[0021] (2) Compared with the existing technology, this technical solution has better overall integrity and better resistance to external disturbances. Attached Figure Description

[0022] Figure 1 This is a perspective view (a) of an embodiment of the present utility model.

[0023] Figure 2 This is a perspective view (II) of an embodiment of the present utility model.

[0024] Figure 3 This is a perspective view (a) of the X-direction movable seat portion in an embodiment of this utility model.

[0025] Figure 4 This is a perspective view (II) of the X-direction movable seat portion in an embodiment of this utility model.

[0026] Figure 5 This is a schematic perspective view of the bottom of the cantilever beam portion in an embodiment of this utility model.

[0027] Figure 6 This is a perspective view of the Y-axis moving seat and the photometer clamping mechanism in an embodiment of this utility model.

[0028] Figure 7 This is a perspective view of the sensing elements XZ, XY, and YH in the embodiments of this utility model.

[0029] Figure 8This is a perspective view of the usage state of an embodiment of this utility model.

[0030] Figure 9 This is a perspective view of the moved state of an embodiment of this utility model.

[0031] In the diagram: 1-Mobile lifting platform, 101-Lifting platform surface, 102-Cast, 103-Rack X, 104-Guide rail X, 105-Left sensor, 1051-Slot, 106-Left mounting bracket, 107-Right sensor, 108-Right mounting bracket; 2-X-direction moving base, 201-Moving base X, 202-Motor X, 203-Slider X, 204-Slider YD, 205-Guide rail clamp, 206-Switch bracket X, 207-Left limit proximity switch, 208-Right limit proximity switch; 3-Cantilever beam, 301-Rear mounting bracket, 3 02-Rear sensor, 303-Cantilever beam, 304-Front sensor, 305-Rack Y, 306-Guide rail YU, 307-Guide rail YD; 4-Y-direction moving seat part, 401-Rear proximity switch, 402-Front proximity switch, 403-Switch frame Y, 404-Motor Y, 405-Moving seat Y, 406-Slider YU; 5-Photometer clamping mechanism, 501-Fixed plate, 5011-Guide groove, 502-Bolt pull block, 503-Bolt, 504-Moving chuck, 505-Fixed chuck, 506-Firming plate; 6-Aerosol photometer probe. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] A device for assisting in detecting the downstream leakage rate of a biosafety cabinet's high-efficiency filter, such as... Figure 1 and Figure 2 As shown, it includes a movable lifting platform part 1, an X-axis movable seat part 2, a cantilever beam part 3, a Y-axis movable seat part 4, a photometer clamping mechanism 5, and a controller. The X-axis is the left-right direction, and the Y-axis is the front-back direction.

[0034] like Figure 2 As shown, the movable lifting platform part 1 includes four casters 102 and a lifting mechanism (an existing scissor lifting mechanism, which will not be described in detail here) supported by the casters 102. The lifting mechanism includes a lifting platform 101, on which a pair of parallel guide rails X104 and a rack X103 are fixedly mounted. A left mounting bracket 106 is fixedly mounted on the left side of the lifting platform 101, and a right mounting bracket 108 is fixedly mounted on the right side. The left sensor 105 and the right sensor 107 are respectively engaged with the left mounting bracket 106 and the right mounting bracket 108, and their positions along the X direction can be adjusted according to actual needs (the left sensor 105, the right sensor 107 are exactly the same as the rear sensor 302 of the cantilever beam part 3, and are all as shown). Figure 7As shown, it is made of rubber and has a slot 1051, which allows it to be snapped onto its corresponding mounting bracket as needed.

[0035] like Figure 3 and Figure 4 As shown, the X-direction movable seat part 2 includes a movable seat X201, on which a slider X203 is provided. The slider X203 matches the guide rail X104 to achieve a linear sliding connection. A motor X202 is fixedly provided on the movable seat X201. The output shaft of the motor X202 is fixedly connected to a gear X. The gear X meshes with the rack X103 for transmission. The movable seat X201 is also provided with a slider YD204, a guide rail clamp 205 and a switch frame X206. A left limit proximity switch 207 and a right limit proximity switch 208 are fixedly provided on the switch frame X206.

[0036] like Figure 1 and Figure 5 As shown, the cantilever beam section 3 includes a cantilever beam 303. A rack Y305 and a guide rail YU306 are fixedly mounted on the top of the cantilever beam 303, and a guide rail YD307 is fixedly mounted on the bottom. The guide rail YD307 is matched with a slider YD204 to achieve a linear sliding connection. The guide rail YD307 is also constrained by a guide rail clamp 205. Manual operation of the guide rail clamp 205 allows the guide rail YD307 to switch between "movable" and "immovable" states. The guide rail clamp is existing technology and will not be described further. A front sensor 304 is fixedly mounted on the front side of the cantilever beam 303, and a rear mounting bracket 301 is fixedly mounted on the rear side. The rear sensor 302 is snapped onto the rear mounting bracket 301, and its position along the Y direction can be adjusted according to actual needs.

[0037] like Figure 1 and Figure 6 As shown, the Y-axis movable seat part 4 includes a movable seat Y405, on which a slider YU406 is provided. The slider YU406 matches the guide rail YU306 to achieve a linear sliding connection. The motor Y404 is fixedly connected to the movable seat Y405. The output shaft of the motor Y404 is fixedly connected to a gear Y, which meshes with the rack Y305 for transmission. The movable seat Y405 is also provided with a switch frame Y403. A rear proximity switch 401 and a front proximity switch 402 are also fixedly provided on the switch frame Y403.

[0038] like Figure 6As shown, the photometer clamping mechanism 5 is used to clamp the aerosol photometer probe 6. Specifically, it includes a fixed plate 501 fixedly connected to the Y-axis moving seat part 4, and a stiffening plate 506 is also provided on the fixed plate 501. The fixed chuck 505 and the bolt pull block 502 are both fixedly connected to the fixed plate 501. The movable chuck 504 is disposed between the fixed chuck 505 and the bolt pull block 502, and is slidably connected to the fixed plate 501 through the T-shaped guide groove 5011. The bolt 503 is screwed to the bolt pull block 502, and the bolt 503 is rotatably connected to the movable chuck 504.

[0039] The left sensor 105 is used to sense the left limit proximity switch 207, the right sensor 107 is used to sense the right limit proximity switch 208, the front sensor 304 is used to sense the front proximity switch 402, and the rear sensor 302 is used to sense the rear proximity switch 401. The left limit proximity switch 207, the right limit proximity switch 208, the rear proximity switch 401, and the front proximity switch 402 are all connected to the controller. The actions of motor X202 and motor Y404 are controlled by the controller.

[0040] Use of this embodiment:

[0041] like Figure 8 As shown, the movable lifting platform 1 is placed close to the open side of the biosafety cabinet. The guide rail clamp 20 is manually operated to release its clamp on the guide rail YD30, making the guide rail YD307 "movable" relative to the slider YD204. Based on the dimensions of the biosafety cabinet's detection space, the cantilever beam 3 is pushed or pulled to ensure its overhang length is appropriate. Then, the guide rail clamp 20 is manually operated again to make the guide rail YD307 "immovable" relative to the slider YD204. The brake switch on the caster 102 is depressed to fix the entire device in position relative to the biosafety cabinet. The positions of the left sensor 105, right sensor 107, and rear sensor 302 are then adjusted. By operating bolt 503, the aerosol photometer probe 6 is clamped onto the photometer clamping mechanism 5; the height of the movable lifting platform 1 is adjusted so that the aerosol photometer probe 6 is about 20mm away from the top air supply surface of the safety cabinet; then, the controller, according to the preset detour scanning program, drives the aerosol photometer probe 6 to perform a full scan in a detour straight line under the joint action of motor X202 and motor Y404.

[0042] When not in use, such as Figure 9 As shown, remove the aerosol photometer probe 6, manually operate the guide rail clamp 20 to release its clamp on the guide rail YD30, making the guide rail YD307 "movable" relative to the slider YD204. Adjust the cantilever beam part 3 to make it symmetrical about the moving lifting platform part 1. Then manually operate the guide rail clamp 20 again to make the guide rail YD307 "immovable" relative to the slider YD204. This makes the width of the entire device as small as possible, which is convenient for pushing, pulling and transportation.

[0043] In the description of this utility model, terms such as "inner", "outer", "upper", "lower", "front", and "rear" that indicate orientation or positional relationship are used only for the convenience of describing this utility model, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] The above description is only one embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A device for assisting in detecting the downstream leakage rate of a biosafety cabinet's high-efficiency filter, characterized in that: It comprises a mobile lifting platform part (1), an X-direction mobile seat part (2), a cantilever beam part (3), a Y-direction mobile seat part (4), a photometer clamping mechanism (5) and a controller, the X-direction is the left-right direction, and the Y-direction is the front-back direction; The mobile lifting platform part (1) comprises a lifting platform (101), the X-direction mobile seat part (2) is slidably connected with the lifting platform (101) along the X-direction, and the movement of the X-direction mobile seat part (2) along the X-direction is driven by a motor X (202); a left limit proximity switch (207) and a right limit proximity switch (208) are fixedly arranged on the X-direction mobile seat part (2), a left mounting rack (106) and a right mounting rack (108) are fixedly arranged on the lifting platform (101), a left sensing part (105) and a right sensing part (107) are arranged on the left mounting rack (106) and the right mounting rack (108) respectively, and the positions of the left sensing part (105) and the right sensing part (107) along the X-direction are adjustable; the left sensing part (105) is used for sensing the left limit proximity switch (207), and the right sensing part (107) is used for sensing the right limit proximity switch (208); The cantilever beam part (3) is slidably connected with the X-direction mobile seat part (2) along the Y-direction, and a locking mechanism is arranged between the cantilever beam part (3) and the X-direction mobile seat part (2); The Y-direction mobile seat part (4) is slidably connected with the cantilever beam part (3) along the Y-direction, the movement of the Y-direction mobile seat part (4) along the Y-direction is driven by a motor Y (404), a rear proximity switch (401) and a front proximity switch (402) are fixedly arranged on the Y-direction mobile seat part (4), a front sensing part (304) and a rear mounting rack (301) are fixedly arranged on the cantilever beam part (3), a rear sensing part (302) is arranged on the rear mounting rack (301) and the position of the rear sensing part (302) along the Y-direction is adjustable; the front sensing part (304) is used for sensing the front proximity switch (402), and the rear sensing part (302) is used for sensing the rear proximity switch (401); The photometer clamping mechanism (5) is arranged on the Y-direction mobile seat part (4), and the photometer clamping mechanism (5) is used for clamping an aerosol photometer probe (6); the left limit proximity switch (207), the right limit proximity switch (208), the rear proximity switch (401) and the front proximity switch (402) are connected with the controller, and the actions of the motor X (202) and the motor Y (404) are controlled by the controller.

2. The device of claim 1, wherein: The X-direction mobile seat part (2) is slidably connected with the lifting platform (101) along the X-direction in the following mode: the lifting platform (101) is provided with parallelly arranged guide rails X (104) and a rack X (103), the X-direction mobile seat part (2) comprises a mobile seat X (201), the mobile seat X (201) is provided with a sliding block X (203), the guide rails X (104) are matched with the sliding block X (203) to realize linear sliding connection; the motor X (202) is fixedly connected with the mobile seat X (201), the output shaft of the motor X (202) is fixedly connected with a gear X, and the gear X is engaged with the rack X (103) for transmission.

3. The device of claim 1, wherein: the device is configured to detect a leak downstream of the HEPA filter of the BSC. The cantilever beam part (3) and the X-direction moving seat part (2) are connected in a sliding mode along the Y direction. The cantilever beam part (3) comprises a cantilever beam (303), the bottom of the cantilever beam (303) is fixedly provided with a guide rail YD (307), the guide rail YD (307) is matched with a sliding block YD (204) to realize linear sliding connection, and the sliding block YD (204) is fixedly connected with the X-direction moving seat part (2).

4. The device for assisting in detecting the downstream leak rate of a biological safety cabinet HEPA filter of claim 3, wherein: The locking mechanism comprises a guide rail clamp (205), the guide rail clamp (205) is fixedly connected with the X-direction moving seat part (2), and the guide rail clamp (205) is used for clamping the guide rail YD (307).

5. The device of claim 3, wherein: the device is configured to detect a leak downstream of the HEPA filter of the BSC. The Y-direction moving seat part (4) and the cantilever beam part (3) are connected in a sliding mode along the Y direction. The cantilever beam (303) is fixedly provided with a guide rail YU (306) and a rack Y (305), the guide rail YU (306) is matched with a sliding block YU (406) to realize linear sliding connection, the sliding block YU (406) is fixedly connected with the Y-direction moving seat part (4), a motor Y (404) is fixedly connected with the Y-direction moving seat part (4), the output shaft of the motor Y (404) is fixedly connected with a gear Y, and the gear Y is in meshing transmission with the rack Y (305).

6. The device of claim 1, wherein: The photometer clamping mechanism (5) comprises a fixed plate (501) fixedly connected with the Y-direction moving seat part (4), a fixed clamp (505) and a bolt pull block (502) fixedly connected with the fixed plate (501), a movable clamp (504) arranged between the fixed clamp (505) and the bolt pull block (502) and in sliding connection with the fixed plate (501), a bolt (503) screwed with the bolt pull block (502), and the bolt (503) in rotary connection with the movable clamp (504).

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