A feedback mechanism for a biosafety cabinet

Abstract

The present invention discloses a feedback mechanism for a biological safety cabinet, which acts on the biological safety cabinet and includes a feedback mechanism disposed behind the human-machine interface. The feedback mechanism includes a positioning block, a first stop rod, and a second stop rod. The positioning block is disposed on the glass window, and the first stop rod and the second stop rod are disposed within the human-machine interface. During the process of pulling the glass window, the positioning block is driven to move between the first stop rod and the second stop rod to be locked, thereby feeding back the position. When the user manually moves the glass window within a predetermined stroke and the glass window reaches the working position, the metal block pushes the second stop rod, and the second stop rod contracts to allow the metal block to pass through, generating a tactile feedback. The user can judge that the glass window has reached the working position through the tactile feedback generated by the feedback mechanism. At the same time, the second stop rod pops out under the action of the spring and collides with the metal block to generate an auditory feedback, assisting the user to drive the glass window to move to a precise designated position.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a feedback mechanism for a biological safety cabinet. Background Art

[0002] A biological safety cabinet is a box-type air purification negative pressure safety device that can prevent the aerosol escape of certain dangerous or unknown biological particles during the experimental operation process. The BSC usually includes a cabinet body and a large and heavy glass window, and the user can manually move the glass window within a predetermined stroke. A certain position in the middle of the stroke close to the glass window is called the "working position". When the lower edge of the glass window reaches the working position, the working performance of the BSC is the best.

[0003] However, in the prior art, when the user wants to accurately 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. Once the glass window cannot accurately and easily reach the working position, various parameters will not meet the expected standards, resulting in a decline in working performance and even potential danger. Summary of the Invention

[0004] The main object of the present invention is to provide a feedback mechanism for a biological safety cabinet, aiming to solve the existing technical problems.

[0005] To achieve the above object, the present invention provides a feedback mechanism for a biological safety cabinet, which acts on the biological safety cabinet. The biological safety cabinet includes a glass window, a cover plate, a human-machine interface and a cabinet body. The glass window is arranged in front of the cabinet body. A cover plate is arranged in front of the cabinet body and in front of the glass window. The cover plate is provided with a human-machine interface on one side close to the edge of the cabinet body. The human-machine interface is fixedly connected to the cover plate and includes a feedback mechanism arranged behind the human-machine interface. The feedback mechanism includes a positioning block, a first stop rod and a second stop rod. The positioning block is arranged on the glass window. The first stop rod and the second stop rod are arranged in the human-machine interface. During the process of pulling the glass window, the positioning block is driven to move between the first stop rod and the second stop rod to be locked, so as to feedback the position.

[0006] Further, a spring hole, a round tube hole and a movable hole are arranged inside the human-machine interface. The round tube hole is arranged at the center position of the top surface of the spring hole. One end of the movable hole is connected to the two round tube holes, and the other end is in the same plane as the cover plate.

[0007] Further, the first stop rod includes a blocking block. An induction plate is arranged on the surface of the blocking block in contact with the positioning block. The induction plate plays a role in connecting the circuit. The blocking block is connected to a fixed rod movably inserted into the round tube hole and the spring hole. An integrally formed protruding structure is arranged at the end of the fixed rod away from the blocking block. A spring is sleeved on the fixed rod and is located in the spring hole.

[0008] Furthermore, a magnet is provided on the surface of the blocking block in the second shift lever that contacts the positioning block, and the adsorption force on the metal block provides resistance for the positioning block.

[0009] Furthermore, the feedback mechanism further includes a connecting block located in the moving hole. A screw rod is threadedly connected to the connecting block, and a circular tube located in the circular tube hole is connected to the end of the connecting block. Wherein, a threaded hole adapted to the screw rod is provided inside the connecting block.

[0010] Furthermore, the positioning block is an equilateral trapezoid, and the included angle formed between its two oblique sides and the glass window is 60 degrees.

[0011] Furthermore, the positioning block is made of a metal material.

[0012] The beneficial effects of the present invention are reflected in:

[0013] In the present invention, when the user manually moves the glass window within a predetermined stroke, when the glass window reaches the working position, the positioning block pushes the second shift lever, and the second shift lever contracts to allow the metal block to pass through, generating a tactile feedback. The user can judge that the glass window has reached the working position through the tactile feedback generated by the feedback mechanism. At the same time, the second shift lever pops out under the action of the spring and collides with the positioning block to generate an auditory feedback, assisting the user to drive the glass window to move to the precise designated position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a perspective view of the present invention;

[0015] Figure 2 is a front view of the present invention;

[0016] Figure 3 is a sectional view of the present invention and a partial enlarged view of the feedback mechanism;

[0017] Figure 4 is a front view of the feedback mechanism after omitting part of the glass window, cover plate, and cabinet body of the present invention;

[0018] Figure 5 is a sectional view and a partial enlarged view of the feedback mechanism after omitting part of the glass window, cover plate, and cabinet body of the present invention;

[0019] Figure 6 is a left view of the feedback mechanism after omitting part of the glass window, cover plate, and cabinet body of the present invention;

[0020] Figure 7 is a perspective view of the feedback mechanism after omitting part of the glass window, cover plate, and cabinet body of the present invention;

[0021] Figure 8 is a left view of the human-machine interface in the present invention;

[0022] Figure 9 The front view of the human-machine interface in the present invention;

[0023] Figure 10 The cross-sectional view of the human-machine interface in the present invention;

[0024] Figure 11 The perspective view of the human-machine interface in the present invention;

[0025] Figure 12 The perspective view of the human-machine interface in the present invention;

[0026] Figure 13 The top view of the metal block in the present invention;

[0027] Figure 14 The perspective view of the metal block in the present invention;

[0028] Figure 15 The left view of the second shift lever, spring and round tube in the present invention;

[0029] Figure 16 The perspective view of the second shift lever in the present invention;

[0030] Figure 17 The cross-sectional view of the round tube in the present invention;

[0031] Figure 18 The left view of the connecting block in the present invention;

[0032] Figure 19 The cross-sectional view of the connecting block in the present invention.

[0033] Explanation of reference numerals:

[0034] 1, glass window; 2, cover plate; 21, reserved hole; 3, human-machine interface; 31, indicator light; 32, spring hole; 33, round tube hole; 34, movable hole; 4, cabinet body; 5, feedback mechanism; 51, positioning block; 52, first shift lever; 521, blocking block; 522, induction plate; 523, wire hole; 524, fixing rod; 525, spring; 53, second shift lever; 531, magnet; 54, round tube; 55, connecting block; 551, threaded hole; 56, screw rod. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0036] Please refer to Figures 1-3 , the present invention provides a feedback mechanism for a biological safety cabinet, which acts on the biological safety cabinet. The biological safety cabinet includes a glass window 1, a cover plate 2, a human-machine interface 3 and a cabinet body 4. The glass window 1 is arranged in front of the cabinet body 4. A cover plate 2 is arranged in front of the cabinet body 4 and in front of the glass window 1. A human-machine interface 3 is arranged on one side of the cover plate 2 close to the edge of the cabinet body 4. The human-machine interface 3 is fixedly connected to the cover plate 2 and includes a feedback mechanism 5 arranged behind the human-machine interface 3. The feedback mechanism 5 includes a positioning block 51, a first stop lever 52 and a second stop lever 53. The positioning block 51 is arranged on the glass window 1. The first stop lever 52 and the second stop lever 53 are arranged in the human-machine interface 3. During the process of pulling the glass window 1, the positioning block 51 is driven to move between the first stop lever 52 and the second stop lever 53 to be locked and the position is feedback.

[0037] In the present invention, when the user manually moves the glass window 1 within a predetermined stroke and the glass window 1 reaches the working position, the positioning block 51 pushes the second stop lever 53. The second stop lever 53 contracts to allow the positioning block 51 to pass through, generating a tactile feedback. The user can judge that the glass window 1 has reached the working position through the tactile feedback generated by the feedback mechanism 5. At the same time, the second stop lever 53 pops out under the action of the spring and collides with the positioning block 51 to generate an auditory feedback to assist the user in driving the glass window 1 to move to a precise designated position.

[0038] In one embodiment, please refer to Figures 8-12 , a spring hole 32, a round tube hole 33 and a movable hole 34 are arranged inside the human-machine interface 3. The round tube hole 33 is arranged at the center position of the top surface of the spring hole 32. One end of the movable hole 34 is connected to the two round tube holes 33, and the other end is in the same plane as the cover plate 2.

[0039] Among them, the spring hole 32 is a cuboid. The upper and lower surfaces of the spring hole 32 are equal in area to the bottom surface of the blocking block 521, and the bottom surface of the spring hole 32 is tangent to the bottom surface of the blocking block 521. The spring hole 32 serves as an installation space for the spring. At the same time, when the metal block 51 pushes the blocking block 521 to contract, the spring hole 32 serves as an activity space for the blocking block 521 and restricts the movement direction of the blocking block 521.

[0040] The circular tube hole 33 is provided at the exact center of the top surface of the spring hole 32. The circular tube hole 33 serves to install the circular tube 54, provides a moving space for the circular tube 54, and restricts the moving direction of the circular tube 54.

[0041] In one embodiment, please refer to Figures 3-6 and Figures 13-19 , the first stop lever 52 includes a blocking block 521. An induction plate 522 is provided on the surface of the blocking block 521 that contacts the positioning block 51. The induction plate 522 serves to connect the circuit. The blocking block 521 is connected to a fixing rod 524 movably inserted into the circular tube hole 33 and the spring hole 32. One end of the fixing rod 524 away from the blocking block 521 is provided with an integrally formed protruding structure, and a spring 525 located in the spring hole 32 is sleeved on the fixing rod 524.

[0042] With this setting in this embodiment, the positioning block 51 serves to push the first stop lever 52 and the second stop lever 53 when the user manually moves the glass window 1 within a predetermined stroke. Induction plates 522 are provided at the contact positions between the two inclined surfaces of the positioning block 51 and the first stop lever 52 and the second stop lever 53. A wire hole 523 is provided between the two induction plates 522. The positioning block 51 is fixedly connected to the corresponding position of the glass window 1. When the glass window 1 reaches the working position, the induction plates 522 on the positioning block 51 contact the first stop lever 52 and the second stop lever 53, connecting the circuit and turning on the indicator light. The user can determine that the glass window 1 has reached the working position through the visual feedback generated by the human-machine interface 3 to ensure that the glass window 1 of the biological safety cabinet accurately reaches the working position.

[0043] In one embodiment, please refer to Figure 5 , a magnet 531 is provided on the surface of the blocking block 521 in the second stop lever 53 that contacts the positioning block 51, and the adsorption force on the metal block provides resistance to the positioning block 51. It should be noted that the other structures of the second stop lever 53 are the same as those of the first stop lever 51.

[0044] With this setting in this embodiment, the magnet 531 serves to provide resistance to the metal block 51 by the adsorption force of the magnet 531 on the metal block 51 when the user moves the glass window 1 and is about to move away from the working position due to inertia, preventing the glass window 1 from exceeding the working position. At the same time, it serves to assist the suspension system of the biological safety cabinet to lock the glass window 1 and improve the safety of the biological safety cabinet.

[0045] In one embodiment, please refer to Figure 5 and Figure 7 , the feedback mechanism 5 further includes a connecting block 55 located in the moving hole 34. A screw rod 56 is threadedly connected to the connecting block 55, and a circular tube 54 located in the circular tube hole 33 of the circular tube 54 is connected to the end of the connecting block 55. Among them, a threaded hole 551 adapted to the screw rod 56 is provided inside the connecting block 55.

[0046] In this embodiment, the circular tube 54 provides a moving space for the fixing rod 524 while restricting the moving direction of the fixing rod 524. At the same time, the positions of the fixing rod 524 and the spring 525 in the spring hole 32 are restricted, so that the bottom surface of the blocking block 521 remains tangent to the human-machine interface 3, and at the same time, it plays a role in pulling the fixing rod 524 to drive the blocking block 521 to move.

[0047] The connecting block 55 plays a role in pulling the circular tube 54 to drive the blocking block 521 to move through the fixing rod 524, and the threaded hole 551 plays a role in fixedly connecting the connecting block 55 with the screw rod 56.

[0048] After the screw rod 56 is in threaded engagement with the connecting block 55, it continues to move forward and engages with the threads (not shown) on the front human-machine interface 3, thus playing a role in fixing the connecting block 55.

[0049] In one embodiment, the positioning block 51 is an equilateral trapezoid, and the included angle formed by its two hypotenuse sides and the glass window 1 is 60 degrees.

[0050] In one embodiment, the positioning block 51 is made of a metal material.

[0051] The cover plate 2 is provided with a reserved hole 21; the cross-section of the reserved hole 21 is a right trapezoid, which plays a role in installing the human-machine interface 3.

[0052] The human-machine interface 3 is provided with an indicator light 31. When the glass window 1 reaches the working position, each induction plate 522 connects the circuit, and the indicator light 31 lights up. The user can determine that the glass window 1 has reached the working position through the visual feedback generated by the human-machine interface 3, so as to ensure that the glass window 1 of the biological safety cabinet accurately reaches the working position.

[0053] The first blocking rod 52 further includes a wire hole 523 for installing wires.

[0054] The complete working principle is as follows: In the initial state, the glass window 1 of the biological safety cabinet is in a closed state, and the state of the feedback mechanism 5 at this time is as Figure 5As shown, under the action of the spring 525, the bottom surface of the blocking block 521 is tangent to one side of the human-machine interface 3, the protruding part of the fixing rod 524 is in contact with the bottom surface of the circular tube 54, and the connecting block 55 is fixedly connected to the human-machine interface 3 under the action of the screw rod 56. When the user manually moves the glass window 1 upward, the metal frame 51 is driven to move upward. When the glass window 1 reaches the working position, the positioning block 51 pushes the blocking block 521 on the second blocking rod 53. After the blocking block 521 is stressed, the spring 525 contracts, and the blocking block 521 contracts into the spring hole 32. The fixing rod 524 enters the circular tube 54. The positioning block 51 generates a tactile feedback through the second blocking rod 53. Subsequently, the blocking block 521 on the second blocking rod 53 is unblocked and quickly pops out under the elastic force of the spring 525, colliding with the positioning block 51 to generate an auditory feedback. At the same time, the magnet 531 is driven to quickly contact the positioning block 51, and the magnet 531 exerts a magnetic force on the positioning block 51. When the user moves the glass window 1 and is about to move away from the working position under the action of inertia, the adsorption force of the magnet 531 on the positioning block 51 provides a resistance for the positioning block 51 to prevent the glass window 1 from exceeding the working position. At the same time, the user also receives some tactile feedback from the magnet 531. At the same time, the magnet 531 assists the biosafety cabinet suspension system to lock the glass window 1, improving the safety of the biosafety cabinet. At the same time, the blocking block 521 on the first blocking rod 52 provides a certain resistance for the continuous forward movement of the positioning block 51 to prevent the glass window 1 from exceeding the working position. When the glass window 1 stops, the respective induction plates 522 come into contact, connecting the circuit, and the indicator light 31 lights up. The user can determine that the glass window 1 has reached the working position through the visual feedback generated by the human-machine interface 3 to ensure that the glass window 1 of the biosafety cabinet has accurately reached the working position. When the feedback device 5 is not required, only the screw rod 56 needs to be taken out and completely inserted into the connecting block 55, mating with the thread 551 on the connecting block 55 and not inserting into the thread hole (not shown) on the human-machine interface 3. At this time, after the screw rod 56 completely penetrates the connecting block 55, a part of the screw rod 56 extends out of the connecting block 55. At this time, the screw rod 56 abuts against the thread hole (not shown) inside the human-machine interface 3, causing a part of the connecting block 55 to extend out of the surface of the cover plate 2, so that the connecting block 55 pulls the circular tube 54 to drive the fixing rod 524, causing the spring 525 to contract while the blocking block 521 is completely kept in the spring hole 32, making the feedback mechanism more flexible.

[0055] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, "a plurality of" means more than two. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A feedback mechanism for a biological safety cabinet, which acts on the biological safety cabinet. The biological safety cabinet includes a glass window (1), a cover plate (2), a human-machine interface (3) and a cabinet body (4). The glass window (1) is arranged in front of the cabinet body (4). A cover plate (2) is arranged in front of the cabinet body (4) and in front of the glass window (1). One side of the cover plate (2) close to the edge of the cabinet body (4) is provided with a human-machine interface (3), and the human-machine interface (3) is fixedly connected to the cover plate (2). It is characterized in that: It includes a feedback mechanism (5) which is arranged behind the human-machine interface (3). The feedback mechanism (5) includes a positioning block (51), a first stop lever (52) and a second stop lever (53). The positioning block (51) is arranged on the glass window (1), and the first stop lever (52) and the second stop lever (53) are arranged inside the human-machine interface (3). During the process of pulling the glass window (1), the positioning block (51) is driven to move between the first stop lever (52) and the second stop lever (53) to be locked, so as to feedback the position. Inside the human-machine interface (3), there are a spring hole (32), a round tube hole (33) and a movable hole (34). The round tube hole (33) is arranged at the exact center position on the top surface of the spring hole (32). One end of the movable hole (34) is connected to two round tube holes (33), and the other end is in the same plane as the cover plate (2). The first stop lever (52) and the second stop lever (53) include a blocking block (521). On the surface of the blocking block (521) that contacts the positioning block (51), there is an induction plate which functions to connect the circuit. And the blocking block (521) is connected to a fixing rod (524) that is movably inserted into the round tube hole (33) and the spring hole (32). One end of the fixing rod (524) far away from the blocking block (521) is provided with an integrally formed protruding structure, and a spring (525) located in the spring hole (32) is sleeved on the fixing rod (524). Among them, induction plates are respectively arranged at the contact positions between the two inclined surfaces of the positioning block (51) and the first stop lever (52) and the second stop lever (53). There is a wire hole (523) between the two induction plates. The positioning block (51) is fixedly connected to the corresponding position of the glass window (1). When the glass window (1) reaches the working position, the induction plates on the positioning block (51) contact the first stop lever (52) and the second stop lever (53), so that the circuit is connected and the indicator light is on.

2. The feedback mechanism for a biological safety cabinet according to claim 1, wherein: On the surface of the blocking block (521) in the second stop lever (53) that contacts the positioning block (51), there is a magnet (531) which provides resistance for the positioning block (51) by the adsorption force on the metal block.

3. The feedback mechanism for a biological safety cabinet according to claim 2, characterized in that: The feedback mechanism (5) further includes a connecting block (55) located in the movable hole (34). A screw rod (56) is threadedly connected to the connecting block (55). And the end of the connecting block (55) is connected to a round tube (54) located in the round tube hole (33). Among them, a threaded hole (551) adapted to the screw rod (56) is arranged inside the connecting block (55).

4. The feedback mechanism for a biosafety cabinet according to claim 1, characterized in that: The positioning block (51) is an equilateral trapezoid, and the included angle formed between its two hypotenuses and the glass window (1) is 60 degrees.

5. The feedback mechanism for a biosafety cabinet according to claim 1, wherein: The positioning block (51) is made of metal material.

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