Safety cabinet for preventing glass from falling and control logic method thereof

Abstract

The application discloses a safety cabinet for preventing glass from falling and a control logic method thereof. The safety cabinet comprises a safety cabinet body, a glass door and a lifting mechanism thereof, and a control panel. The glass door is driven to lift by the lifting mechanism. The front side of the safety cabinet body is provided with a front cover, and the glass door is arranged on the inner side of the front cover. Meanwhile, an anti-falling structure is arranged on the inner side wall of the front cover, which comprises a fixing support, a tongue lock bottom support and a tongue lock. The fixing support is fixed on the inner side wall of the front cover, the tongue lock bottom support is fixed on the bottom of the fixing support, and the tongue lock is fixed between the tongue lock bottom support and the fixing support, and the lock tongue of the tongue lock extends to the glass door. A glass baffle is fixedly assembled on the upper edge of the glass door, the center of the glass baffle is provided with a square hole corresponding to the lock tongue, and the lock tongue of the tongue lock can be inserted into the square hole. The application has the advantages of simple structure, low cost, small occupied space, safety and reliability, and can effectively prevent the sudden falling of the glass door, avoid the injury of the staff and the damage of the instrument.

Description

Technical Field

[0001] This invention relates to the field of biosafety cabinet technology, specifically to a biosafety cabinet that prevents the glass from falling out and its control logic method. Background Technology

[0002] Biosafety cabinets are essential equipment in modern laboratories, especially in situations where protective measures are required for operators, such as in medical, pharmaceutical, and research settings where bacterial culture is conducted. Biosafety cabinets provide dual protection for both samples and personnel. Currently, most biosafety cabinets use a door motor to control the raising and lowering of the glass door. If the control system malfunctions suddenly, or if the steel cable controlling the door breaks, the door may suddenly slam down. If personnel are operating under the door or if laboratory equipment is placed beneath it, the sudden descent could cause injury or damage to the equipment, posing a significant risk.

[0003] Currently, some biosafety cabinets also have light sensors installed on the glass sliding rails. These sensors detect the presence of objects below the glass door. When a person's arm or experimental equipment is below the glass door, the light sensor is triggered, and the safety cabinet's control system cuts off power to the door motor to prevent accidental injury. However, the following problems still exist: 1. The cost of light sensors is relatively high; 2. Light sensors can produce false alarms; 3. The detection range of light sensors is limited. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a safety cabinet that prevents glass from falling out.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a safety cabinet that prevents the glass door from falling off, comprising a safety cabinet body, a workbench, a glass door and its lifting mechanism, and a control panel. The glass door is driven to rise and fall by the lifting mechanism. A working cavity is provided at the lower interior of the safety cabinet body, and a front cover is provided on the front side of the safety cabinet body. An operating opening is provided at the lower part of the front cover corresponding to the working cavity. The glass door is located inside the front cover and can slide up and down. An anti-fall structure is provided on the inner side wall of the front cover. The anti-fall structure includes a fixed bracket, a tongue lock base support, and a tongue lock. The fixed bracket is vertically fixed to the inner side wall of the front cover. The tongue lock base support is fixedly installed at the bottom of the fixed bracket. The tongue lock is fixedly located between the tongue lock base support and the fixed bracket, and its locking tongue extends towards the glass door.

[0006] Corresponding to the fixed position of the latch lock, a glass baffle is fixedly installed at the top of the glass door. The center of the glass baffle is provided with a square hole corresponding to the latch, and the latch lock can be inserted into the square hole.

[0007] Furthermore, a position sensing device is provided on the inner side wall of the front cover, which is connected to a control panel installed on the outer side wall of the front cover via a wiring connection. The control panel is connected to a latch lock via a wiring connection to control the extension and retraction of the latch. A limit switch corresponding to the position sensing device is provided at the top of the glass door.

[0008] Furthermore, the lifting mechanism includes a traction steel wire rope, a power component, a guide wheel, and a mounting component. The mounting component is fixedly installed on the inside of the glass door, and the guide wheel is fixedly installed on the top of the main body of the safety cabinet. One end of the traction steel wire rope is fixed to the mounting component, and the other end is connected to the power component after passing around the guide wheel. The power component drives and controls the lifting of the glass door.

[0009] Furthermore, a position adjustment plate is fixedly provided on the inner side wall of the front cover, and the position adjustment plate is provided with several connection holes; the fixed bracket is fixed to the position adjustment plate by bolts, and can be adjusted up and down to fix the position.

[0010] Preferably, the fixing bracket is L-shaped and has reinforcing ribs.

[0011] Preferably, the tongue lock base is U-shaped and is fixedly installed at the bottom of the fixed bracket by bolts.

[0012] Preferably, the glass baffle is made of a metal material.

[0013] The technical solution described in this invention also discloses a control logic method for preventing glass doors from falling, applied to the aforementioned safety cabinet for preventing glass from falling. When the control panel receives an opening command, the glass door automatically rises under the action of the lifting mechanism. After rising to the position of the opening limit switch, the electromagnetic lock tongue in the latch automatically springs open and extends into the square hole of the glass baffle on the glass door to lock the glass door. After the operation is completed, when the closing button is pressed, the control panel receives a closing signal, the electromagnetic lock tongue in the latch automatically retracts and resets, and the glass door automatically descends.

[0014] Compared with the prior art, the present invention has the following advantages: the present invention has a simple overall structure, low cost, small space occupation, and is safe and reliable. It can effectively prevent the glass door from falling suddenly, avoiding injury to staff and damage to equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the safety cabinet of the present invention;

[0016] Figure 2 This is an internal view of the anti-fall structure installed in this invention;

[0017] Figure 3 for Figure 2 Enlarged view of section A;

[0018] Figure 4 This is an inner structural view of the front cover in this invention;

[0019] Figure 5 This is a diagram showing the relationship between the anti-fall structure and the glass door in this invention;

[0020] In the diagram: 1. Safety cabinet body, 2. Front cover, 3. Glass door, 4. Control panel, 5. Traction steel wire rope, 6. Guide wheel, 21. Position adjustment plate, 22. Fixed bracket, 23. Tongue lock base, 24. Tongue lock, 31. Glass baffle. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments, the specific implementation of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of the present invention. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] In this embodiment, terms such as "upper," "lower," "inner," "middle," "outer," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe the structural relationships of the components in this embodiment of the invention, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this embodiment according to the specific circumstances.

[0023] Furthermore, the terms "set up," "install," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0024] Unless otherwise stated, the term "multiple" means two or more.

[0025] like Figures 1 to 5As shown, a safety cabinet designed to prevent glass doors from falling off includes a cabinet body 1, a workbench, a glass door 3 and its lifting mechanism, and a control panel 4. The cabinet body 1 has a support frame at its lower part, with casters at the four corners of the frame for movement and positioning. The cabinet body 1 has a working chamber at its lower interior, with a workbench at its bottom. A front cover 2 is fixedly installed on the front of the cabinet body 1, with an operating opening below the front cover 2 corresponding to the working chamber for easy experimental operation. A liftable glass door 3 is located at the corresponding operating opening, mounted on the inside of the front cover 2 via guide rails on both sides and driven by the corresponding lifting mechanism. The control panel 4 is fixedly installed on the front of the front cover 2 to control the operation of the entire safety cabinet.

[0026] A rectangular position adjustment plate 21 is fixedly installed on the inner wall of the front cover 2. The position adjustment plate 21 has several insertion connection holes and an anti-fall structure, which includes a fixed bracket 22, a tongue lock base 23, and a tongue lock 24. The fixed bracket 22 is L-shaped and has reinforcing ribs fixed on its left and right sides to increase its stability. The vertical plate of the fixed bracket 22 is adjustablely fixed to the position adjustment plate 21 with bolts, and its horizontal plate has bolt holes. The tongue lock base 23 is U-shaped and is fixedly installed at the bottom of the fixed bracket 22 with bolts. The tongue lock 24 is fixedly housed in the space enclosed by the tongue lock base 23 and the fixed bracket 22, achieving relative fixation. According to actual production needs, the position of the fixed bracket 22 on the position adjustment plate 21 can be adjusted in real time by adjusting the movable bolts to achieve the height adjustment of the tongue lock 24.

[0027] Corresponding to the fixed position of the tongue lock 24, a glass baffle 31 is fixedly installed on the upper edge of the glass door 3. The glass baffle 31 is made of metal material and has a certain degree of sturdiness. A square hole is provided in the center of the glass baffle 31, and the lock tongue of the above-mentioned tongue lock 24 can be fitted into the corresponding square hole to complete the blocking and prevent the glass door 3 from falling.

[0028] In a further optimized technical solution, a position sensing device, such as a travel sensor, is fixedly installed on the inner wall of the front cover 2. It is connected to the control panel 4 via a line, and the control panel 4 is connected to the tongue lock 24 via a line to control the extension and retraction of its tongue. A travel switch corresponding to the position sensing device is provided on the upper edge of the glass door 3.

[0029] Furthermore, the aforementioned lifting mechanism includes a traction steel wire rope 5, a power component, guide wheels 6, and a mounting bracket. The mounting bracket is fixedly installed on the inner side of the glass door 3. Two guide wheels 6 are provided, respectively fixedly installed on the front and rear edges of the top of the safety cabinet body 1. One end of the traction steel wire rope 5 is fixed to the mounting bracket on the inner side of the glass door 3, and the other end changes direction around the two guide wheels 6 and is connected to the power component, which drives and controls the lifting and lowering of the glass door 3. Two sets of lifting mechanisms are symmetrically arranged, located on the left and right sides of the glass door 3, respectively, and operate synchronously to prevent deviation during the lifting and lowering process of the glass door 3.

[0030] This invention also claims protection for a control logic method for preventing glass doors from falling, applicable to the aforementioned safety cabinet designed to prevent glass doors from falling. During safe operation, when the control panel 4 receives an opening command (open button on the touchscreen), the glass door 3 automatically rises under the action of the lifting mechanism. When it reaches the designated height, the limit switch on the glass door 3 aligns with the position sensing device on the inner wall of the front cover 2, transmitting a signal to the control panel 4. Subsequently, the electromagnetic latch in the latch lock 24 automatically pops out and extends into the square hole of the glass baffle 31 on the glass door 3, locking the glass door 3 and preventing it from falling. After the operator completes the operation and presses the close button on the touchscreen, when the control panel 4 receives the close signal, the electromagnetic latch in the latch lock 24 automatically retracts and resets, and the glass door 3 automatically descends under the action of the lifting mechanism, completing the closing action.

[0031] The relevant technical solutions not mentioned or described in detail in the above embodiments can be implemented by adopting or drawing on relevant technical features in the existing technology.

[0032] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A safety cabinet for preventing glass doors from falling off, comprising a cabinet body, a workbench, a glass door and its lifting mechanism, and a control panel, wherein the glass door is lifted and lowered by the lifting mechanism, characterized in that: The safety cabinet body has a working chamber at its lower interior and a front cover on its front side. An operating opening is located below the front cover corresponding to the working chamber. The glass door is located inside the front cover and can slide up and down. The inner wall of the front cover has an anti-fall structure, which includes a fixed bracket, a tongue lock base support, and a tongue lock. The fixed bracket is vertically fixed to the inner wall of the front cover. The tongue lock base support is fixedly installed at the bottom of the fixed bracket. The tongue lock is fixedly located between the tongue lock base support and the fixed bracket, and its locking tongue extends towards the glass door. Corresponding to the fixed position of the latch lock, a glass baffle is fixedly installed at the top of the glass door. The center of the glass baffle is provided with a square hole corresponding to the latch lock, and the latch lock can be inserted into the square hole. The inner wall of the front cover is also equipped with a position sensing device, which is connected to a control panel installed on the outer wall of the front cover via a wire. The control panel is connected to a latch lock via a wire to control the extension and retraction of the latch. The top of the glass door is equipped with a limit switch corresponding to the position sensing device. A position adjustment plate is fixedly provided on the inner side wall of the front cover, and the position adjustment plate has several connection holes; the fixing bracket is fixed to the position adjustment plate by bolts, and can be adjusted up and down to fix the position.

2. The safety cabinet for preventing glass from falling as described in claim 1, characterized in that: The lifting mechanism includes a traction steel wire rope, a power component, a guide wheel, and a mounting component. The mounting component is fixedly installed on the inside of the glass door, and the guide wheel is fixedly installed on the top of the main body of the safety cabinet. One end of the traction steel wire rope is fixed to the mounting component, and the other end is connected to the power component after passing around the guide wheel. The power component drives and controls the lifting of the glass door.

3. The safety cabinet for preventing glass from falling as described in claim 1, characterized in that: The fixed bracket is L-shaped and has reinforcing ribs.

4. The safety cabinet for preventing glass from falling as described in claim 1, characterized in that: The tongue lock base is U-shaped and is fixedly installed at the bottom of the fixed bracket by bolts.

5. A safety cabinet for preventing glass from falling as described in claim 1, characterized in that: The glass baffle is made of metal.

6. A control logic method for preventing glass doors from falling off, applied to a safety cabinet for preventing glass from falling off as described in any one of claims 1 to 5, characterized in that: When the control panel receives the door opening command, the glass door automatically rises under the action of the lifting mechanism. After rising to the door opening limit switch position, the electromagnetic lock tongue in the latch automatically pops open and extends into the square hole of the glass baffle on the glass door to lock the glass door. After the operation is completed, when the door closing button is pressed, the electromagnetic lock tongue in the latch automatically retracts and resets when the control panel receives the door closing signal, and the glass door automatically descends.

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