Feedback mechanism for biological safety cabinet

Abstract

The invention relates to the field of medical equipment, in particular to a feedback mechanism for a biosafety cabinet, which comprises a glass window, a panel, a human-computer interface, a cabinet body and a feedback mechanism, the glass window is arranged in front of the cabinet body, a panel is arranged in front of the cabinet body and in front of at least one part of the glass window, a human-computer interface is arranged on one side, close to the edge of the cabinet body, of the panel, and a feedback mechanism is arranged behind the human-computer interface; the problem of confirming the position of the glass window of the biological safety cabinet is solved through tactile, auditory and visual feedback generated by matching of the execution block and the electromagnet. The second electromagnet attracts the first movable arm to send out an auditory signal, the first electromagnet attracts the metal frame to provide force feedback, and falling of the glass window caused by failure of the suspension system is prevented. In addition, linkage of the first electromagnet and the first movable arm triggers a human-computer interface indicating lamp, and visual confirmation is provided. The comprehensive feedback mechanisms enhance the accuracy and safety of the operation.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically to a feedback mechanism for a biosafety cabinet. Background Technology

[0002] A biosafety cabinet (BSC) is a box-type air-purified negative pressure safety device that prevents the aerosol release of hazardous or unknown biological particles during experimental procedures. It is widely used in research, teaching, clinical testing, and production in fields such as microbiology, biomedicine, genetic engineering, and biopharmaceuticals, and is the most basic safety protection equipment in the primary protection barrier of laboratory biosafety.

[0003] A Base Controller (BSC) typically consists of a cabinet and a large, heavy glass window (typically 1.8 meters long and 1.2 meters wide) located in front of the cabinet's testing area. The glass window can be manually moved within a predetermined travel range. A position near the midpoint of this travel range is called the "working position." The BSC performs best when the lower edge of the glass window reaches the working position.

[0004] However, in the existing technology, when the user wants to move the glass window to the working position, the glass window is always moved out of the working position due to its large weight and volume. According to the biosafety cabinet industry standard, the airflow velocity and other standards generated by the fan in the BSC are determined based on the working position. Therefore, if the glass window cannot be accurately and easily moved to the working position, various parameters will not meet the expected standards, resulting in a decrease in working performance and even the possibility of danger. Summary of the Invention

[0005] Therefore, this invention addresses the aforementioned problems by providing tactile, auditory, and visual feedback through the interaction of an actuator and an electromagnet, thus resolving the issue of confirming the position of the glass window in a biosafety cabinet. Electromagnet two attracts boom one, emitting an audible signal, while electromagnet one attracts the metal frame, providing force feedback to prevent the glass window from falling due to suspension system failure. Furthermore, the linkage between electromagnet one and boom one triggers indicator lights on the human-machine interface, providing visual confirmation. These integrated feedback mechanisms enhance the accuracy and safety of operation. This invention achieves the above objectives through the following technical solutions.

[0006] A feedback mechanism for a biosafety cabinet includes: a glass window, a panel, a human-machine interface, a cabinet body, and a feedback mechanism;

[0007] The glass window is slidably located at the front of the cabinet. A panel is located in front of the glass window. A human-machine interface is located on the side of the panel near the edge of the cabinet. A feedback mechanism is located behind the human-machine interface.

[0008] The panel is provided with pre-drilled holes, arc-shaped tracks, and positioning holes; the pre-drilled holes are irregular trapezoids, and there are two arc-shaped tracks on each side of the pre-drilled holes, which are symmetrically arranged on both sides of the pre-drilled holes. The positioning holes are located on the panel on both sides of the pre-drilled holes. Preferably, the positioning holes should be located slightly above the center point of the pre-drilled holes; the human-machine interface is provided with indicator lights.

[0009] The feedback mechanism includes: a metal frame, beads, a rod, a baffle, electromagnet one, and electromagnet two; the metal frame is a right-angled trapezoid, fixedly connected to the corresponding position of the glass window, with a rounded corner at the top of the metal frame that does not contact the glass window, and the longest right-angled face contacting the glass window, the angle formed between the oblique face and the glass window being less than a degree, preferably, the angle formed between the oblique face of the metal frame and the glass window being a degree; the metal frame is evenly provided with multiple spherical holes, the spherical holes being incomplete spheres; there are multiple beads, each movable in one of the spherical holes, with the bead protruding less than a degree after being installed in the spherical hole. Half the volume; the round rod is located in the positioning hole inside the panel; the baffle includes: boom one, boom two, and mating hole; boom one and boom two are an integral structure, and a mating hole is provided at their connection, the mating hole is movably fitted on the round rod; the included angle formed between boom one and boom two can satisfy that when electromagnet two attracts boom one, the magnetic field of electromagnet one on boom two comes into contact with the metal frame; electromagnet one is fixedly connected to boom two, and it can attract the metal frame; each end of electromagnet two is provided with two arc-shaped slide rails corresponding to the arc-shaped track, and electromagnet two is movably set on the arc-shaped track through the arc-shaped slide rails, and it can attract boom one.

[0010] Beneficial effects of this invention:

[0011] 1. When the glass window needs to be moved, the ball pushes the first movable arm. When the glass window reaches the working position, the first movable arm is close to the magnetic field range of the second electromagnet. The second electromagnet attracts the first movable arm, generating auditory feedback. The user can judge that the glass window has reached the working position through the auditory feedback generated by the feedback mechanism, so as to realize the position feedback of the glass window of the biosafety cabinet.

[0012] 2. In this invention, the first arm is attracted by the second electromagnet, which moves the first arm upward and drives the second arm upward, so that the metal frame is close to the magnetic field range of the first electromagnet on the second arm. The first electromagnet attracts the lower slope of the metal frame, generating both auditory and force feedback. The user can judge that the glass window has reached the working position by the auditory and force feedback generated by the feedback mechanism.

[0013] 3. The electromagnet in this invention is connected to the metal frame through a magnetic field, which can prevent the glass window from falling and causing injury to the user after the suspension system of the biosafety cabinet fails, as well as affecting the experimental process.

[0014] 4. This invention uses an electromagnet to attract the lower slope of the metal frame, causing the boom to move the electromagnet upwards and contact the human-machine interface, illuminating the indicator light on the human-machine interface and generating visual feedback. The user can judge whether the glass window has reached the working position through the visual feedback generated by the linkage between the feedback mechanism and the human-machine interface, thus ensuring that the glass window of the biosafety cabinet is accurately positioned for operation. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention.

[0016] Figure 2 This is a front view of the present invention.

[0017] Figure 3 This is a cross-sectional view and a partially enlarged view of the feedback mechanism of the present invention.

[0018] Figure 4 The front view of the feedback mechanism after omitting some glass windows, panels, and cabinets is shown in the present invention.

[0019] Figure 5 This is a cross-sectional view of the feedback mechanism after omitting parts of the glass window, panel, and cabinet in this invention.

[0020] Figure 6 This is a perspective view of the feedback mechanism after omitting some of the glass windows, panels, and cabinets in this invention.

[0021] Figure 7 This is a cross-sectional view of the biosafety cabinet in a closed state, with some glass windows, panels, and cabinet body omitted.

[0022] Figure 8 This is a cross-sectional view of the present invention when the feedback mechanism does not generate feedback after the glass window reaches the working position, omitting some glass windows, panels, and cabinets.

[0023] Figure 9 This is a left view of electromagnet II in this invention.

[0024] Figure 10 This is a perspective view of electromagnet II in this invention.

[0025] Figure 11 This is a perspective view of the baffle in this invention.

[0026] Figure 12 This is the left view of the metal frame in this invention.

[0027] Figure 13 This is a front view of the metal frame in this invention.

[0028] Figure 14 This is a perspective view of the metal frame in this invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Glass window; 2. Panel; 21. Pre-drilled hole; 22. Curved track; 23. Positioning hole; 3. Human-machine interface; 31. Indicator light; 4. Cabinet; 5. Feedback mechanism; 51. Metal frame; 511. Spherical hole; 52. Ball; 53. Round rod; 54. Baffle; 541. Boom 1; 542. Boom 2; 543. Mating hole; 55. Electromagnet 1; 56. Electromagnet 2; 561. Curved slide rail. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figure 1 , 2 As shown in Figures 1 and 3, a feedback mechanism for a biosafety cabinet includes: a glass window 1, a panel 2, a human-machine interface 3, a cabinet body 4, and a feedback mechanism 5.

[0033] The glass window 1 is located at the front of the cabinet 4. The user can manually move the glass window 1 up and down within a predetermined stroke. When the glass window 1 is at the bottom of the testing area of ​​the cabinet 4, the biosafety cabinet is in a closed state. A panel 2 is provided at the front of the cabinet 4 and at least part of the front of the glass window 1. A human-machine interface 3 is provided on one side of the panel 2 near the edge of the cabinet 4. A feedback mechanism 5 is provided behind the human-machine interface 3.

[0034] like Figure 3 , 5 As shown in Figures 6 and 7, the panel 2 is provided with pre-made holes 21, arc-shaped tracks 22, and positioning holes 23;

[0035] The pre-drilled hole 21 is an irregular trapezoid, which serves to install the human-machine interface 3 and house the feedback mechanism 5, while also providing space for the feedback mechanism 5 to move. There are two arc-shaped tracks 22 on each side of the pre-drilled hole 21, which are symmetrically arranged on both sides of the pre-drilled hole 21 and are respectively arranged to correspond to the movement path of the electromagnet 56. They are also coaxially arranged with the positioning hole 23. The positioning hole 23 is located on the panel 2 on both sides of the pre-drilled hole 21 and serves to fix the round rod 53. Preferably, the positioning hole 23 should be located slightly above the center point of the pre-drilled hole 21.

[0036] The human-machine interface 3 is equipped with an indicator light 31. When electromagnet 1 55 drives electromagnet 2 56 to fit with the human-machine interface 3, the indicator light 31 is powered on and illuminates. The indicator light 31 serves to generate visual feedback, enabling the user to determine that the glass window 1 has reached the working position through the visual feedback generated by the linkage between the feedback mechanism 5 and the human-machine interface 3, so as to ensure that the glass window 1 of the biosafety cabinet is accurately in the working position.

[0037] like Figure 8-14 As shown, the feedback mechanism 5 includes: a metal frame 51, a ball 52, a rod 53, a baffle 54, an electromagnet 1 55, and an electromagnet 2 56.

[0038] The metal frame 51 is a right trapezoid and is fixedly connected to the corresponding position of the glass window 1. The corner of the metal frame 51 that is located at the top and does not contact the glass window 1 is rounded. The right-angled face with the longest side is in contact with the glass window 1. The angle formed between the oblique face and the glass window 1 is less than 90 degrees. Preferably, the angle formed between the oblique face of the metal frame 51 and the glass window 1 is 60 degrees. The metal frame 51 is also evenly provided with a plurality of spherical holes 511. The spherical holes 511 are incomplete spheres, which serve to allow the part of the bead 52 to protrude after installation.

[0039] There are multiple beads 52, which are evenly and dynamically disposed in the spherical hole 511. After the beads 52 are installed in the spherical hole 511, less than half of the volume of the beads 52 is exposed. The beads 52 play the role of pushing the boom 541 while reducing the friction between the glass window 1 and the cabinet 4.

[0040] The round rod 53 is located in the positioning hole 23 inside the panel 2, and serves to fix the baffle 54.

[0041] The baffle 54 includes: boom one 541, boom two 542, and mating hole 543;

[0042] The first boom 541 and the second boom 542 are an integral structure, and a mating hole 543 is provided at their connection. The included angle formed between the first boom 541 and the second boom 542 can satisfy the requirement that when the second electromagnet 56 attracts the first boom 541, the magnetic field of the first electromagnet 55 on the second boom 542 comes into contact with the metal frame 51.

[0043] Under the pushing action of the ball 52, when the glass window 1 reaches the working position, the boom 541 approaches the magnetic field range of the electromagnet 56. The boom 541 is attracted by the electromagnet 56, generating auditory feedback. The user can judge that the glass window 1 has reached the working position through the auditory feedback generated by the feedback mechanism 5, so as to realize the position feedback of the glass window 1 of the biosafety cabinet.

[0044] As the boom 2 542 moves with the boom 1 541, when the electromagnet 2 56 attracts the boom 1 541, the boom 2 542 drives the electromagnet 1 55 to approach the metal frame 51. At this time, the metal frame 51 is close to the magnetic field range of the electromagnet 1 55 on the boom 2 542. The electromagnet 1 55 attracts the lower slope of the metal frame 51, generating both auditory and force feedback. The user can judge whether the glass window 1 has reached the working position through the auditory and force feedback generated by the feedback mechanism 5. At the same time, the electromagnet 1 55 is connected to the metal frame 51 through the magnetic field, which can prevent the glass window 1 from falling and causing injury to the user and affecting the experimental process if the biosafety cabinet suspension system fails. Meanwhile, the boom 2 542 drives the boom 1 541 to move upward, causing the electromagnet 2 56 to move upward and fit with the human-machine interface 3. The indicator light 31 lights up, generating visual feedback. The user can judge whether the glass window 1 has reached the working position through the visual feedback generated by the linkage between the feedback mechanism 5 and the human-machine interface 3, so as to ensure that the glass window 1 of the biosafety cabinet is accurately in the working position.

[0045] The mating hole 543 is sleeved on the round rod 53, which serves to movably connect the baffle 54 and the round rod 53.

[0046] The electromagnet 55 is fixedly connected to the boom 542. When the electromagnet 56 attracts the boom 541, the boom 541 moves upward, causing the boom 542 to move upward as well. This brings the metal frame 51 close to the magnetic field range of the electromagnet 55 on the boom 542. The electromagnet 55 then attracts the lower slope of the metal frame 51, generating both audible and force feedback. The user can determine that the glass window 1 has reached the working position through the audible and force feedback generated by the feedback mechanism 5. Simultaneously, the electromagnet 55... The magnetic field is connected to the metal frame 51 to prevent the glass window 1 from falling and injuring the user or affecting the experimental process if the suspension system of the biosafety cabinet fails. At the same time, the electromagnet 55 drives the boom 542 to move the boom 541 upward, which in turn moves the electromagnet 56 upward, so that it is in contact with the human-machine interface 3. The indicator light 31 lights up, generating visual feedback. The user can judge whether the glass window has reached the working position through the visual feedback generated by the linkage between the feedback mechanism 5 and the human-machine interface 3, so as to ensure that the glass window of the biosafety cabinet is accurately in the working position.

[0047] The electromagnet 2 56 has two arc-shaped slide rails 561 at each end, which correspond to the arc-shaped track 22. The electromagnet 2 56 is movably fixed in the pre-made hole 21 in the panel 2 through the cooperation of the arc-shaped slide rails 561 and the arc-shaped track 22.

[0048] The second electromagnet 56 is located above the first boom 541. When the ball 52 pushes the first boom 541 close to the magnetic field range of the second electromagnet 56, the second electromagnet 56 attracts the first boom 541, generating auditory feedback. The user can judge that the glass window 1 has reached the working position through the auditory feedback generated by the feedback mechanism 5, so as to realize the position feedback of the glass window 1 of the biosafety cabinet. At the same time, the second electromagnet 56 moves the first boom 541 upward and moves the second boom 542 upward and closer to the first electromagnet 55.

[0049] Working principle of this invention:

[0050] In the initial stage, the glass window 1 of the biosafety cabinet is completely closed, and the status of the feedback mechanism 5 is as follows: Figure 7 As shown, under the influence of gravity, one corner of electromagnet 55 is tangent to the bottom surface of the pre-drilled hole 21, and the first movable arm 541 extends a portion beyond the pre-drilled hole 21. Under the influence of gravity, the bottom surface of the arc-shaped slide rail 561 of electromagnet 56 contacts the bottom surface of the arc-shaped track 22. When the user powers on the biosafety cabinet, electromagnets 55 and 56 are also energized. The user manually moves the glass window 1 upward, causing the metal frame 51 and the ball 52 to move upward. Subsequently, the ball 52 contacts the first movable arm 541, and the glass window 1 continues to move upward. The ball 52 pushes the first movable arm 541, causing the second movable arm 542 to move upward. After the glass window 1 continues to move upward and reaches the working position, the state of the feedback mechanism 5 is as follows. Figure 8 As shown, when boom 541 enters the magnetic field range of electromagnet 56, electromagnet 56 attracts boom 541, and feedback mechanism 5 generates auditory feedback. The user can then determine that the glass window 1 has reached the working position based on this auditory feedback. The user stops moving the glass window 1 upwards. Simultaneously, boom 541 drives boom 542 upwards, causing the magnetic field of electromagnet 55 to come into contact with the metal frame 51. Electromagnet 55 attracts the metal frame 51, generating both auditory and force feedback. The user can then determine that the glass window 1 has reached the working position based on both the auditory and force feedback generated by feedback mechanism 5. Upon reaching the working position, electromagnet 55 connects to the metal frame 51 via a magnetic field, preventing the glass window 1 from falling and injuring the user or affecting the experimental process if the biosafety cabinet's suspension system fails. Simultaneously, as electromagnet 55 moves boom 542 upward, boom 541 pushes electromagnet 55 upward to align with the human-machine interface 3, illuminating indicator 31 and generating visual feedback. The user can judge whether the glass window 1 has reached the working position through the visual feedback generated by the linkage between the feedback mechanism 5 and the human-machine interface 3, ensuring that the biosafety cabinet's glass window 1 accurately reaches the working position.

Claims

1. A feedback mechanism for a biosafety cabinet, comprising: Glass window (1), panel (2), human-machine interface (3), cabinet (4), feedback mechanism (5); The glass window (1) is slidably disposed in front of the cabinet (4), a panel (2) is provided in front of the glass window (1), a human-machine interface (3) is provided on the side of the panel (2) near the edge of the cabinet (4), and a feedback mechanism (5) is provided behind the human-machine interface (3). The panel (2) is provided with a pre-made hole (21), an arc-shaped track (22), and a positioning hole (23); the arc-shaped track (22) is symmetrically arranged on both sides inside the pre-made hole (21); the positioning hole (23) is provided on both sides of the pre-made hole (21); The feedback mechanism (5) includes: a metal frame (51), a ball (52), a rod (53), a baffle (54), an electromagnet one (55), and an electromagnet two (56); the metal frame (51) is fixedly connected to the side wall of the glass window (1), and a plurality of spherical holes (511) are evenly provided on the metal frame (51); there are a plurality of balls (52), which are movably disposed in the spherical holes (511); the rod (53) is disposed in the positioning hole (23); the baffle (54) includes: a first movable arm (541), a second movable arm (542), and a mating hole (543); Arm 1 (541) and Arm 2 (542) are an integral structure, and a mating hole (543) is provided at their connection. The mating hole (543) is movably sleeved on the round rod (53). Electromagnet 1 (55) is fixedly connected to one end of Arm 2 (542), and it can attract the metal frame (51). Arc-shaped slide rails (561) are provided at both ends of Electromagnet 2 (56), and Electromagnet 2 (56) is movably mounted on the arc-shaped track (22) through the arc-shaped slide rails (561). Electromagnet 2 (56) is located above Arm 1 (541), and it can attract Arm 1 (541).

2. The feedback mechanism for a biosafety cabinet according to claim 1, characterized in that: The metal frame (51) is a right trapezoid and is fixedly connected to the corresponding position of the glass window (1). The corner of the metal frame (51) that is located above and does not contact the glass window (1) is rounded. The right-angled surface with the longest side is in contact with the glass window (1). The angle formed between the oblique surface and the glass window (1) is less than 90 degrees.

3. The feedback mechanism for a biosafety cabinet according to claim 2, characterized in that: The angle between the beveled surface of the metal frame (51) and the glass window (1) is 60 degrees.

4. The feedback mechanism for a biosafety cabinet according to claim 3, characterized in that: The spherical hole (511) is an incomplete sphere, and after the bead (52) is installed in the spherical hole (511), less than half of the volume of the bead (52) is exposed.

5. A feedback mechanism for a biosafety cabinet according to claim 4, characterized in that: The angle formed between the first movable arm (541) and the second movable arm (542) is such that when the second electromagnet (56) attracts the first movable arm (541), the magnetic field of the first electromagnet (55) on the second movable arm (542) comes into contact with the metal frame (51).

6. A feedback mechanism for a biosafety cabinet according to claim 5, characterized in that: The human-machine interface (3) is equipped with indicator lights (31).

7. A feedback mechanism for a biosafety cabinet according to claim 6, characterized in that: The positioning hole (23) should be located slightly above the center point of the pre-made hole (21).

8. A feedback mechanism for a biosafety cabinet according to claim 7, characterized in that: The pre-made hole (21) is an irregular trapezoid.

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