Anti-falling mechanism of fume hood

Abstract

The utility model discloses a fume hood anti -falling mechanism relates to the safety protection field, including the cabinet, the cabinet outer wall rotationally connected has the screwing wheel, the screwing wheel is connected in the rubber wheel through the screw of the penetration cabinet rotation, the rubber wheel outer wall slidingly connected has the protective glass, the protective glass outer wall fixedly connected has the anti -falling mechanism, the anti -falling mechanism is by the rack plate, the brake rack, the mounting plate base constitutes, the mounting plate base inside fixed mounting has the brake rack, the brake rack one end swing joint is in the rack plate, the rack plate one side fixedly connected in the cabinet. The utility model discloses through the frictional resistance of stationary rubber wheel effectively slows down the glass descending speed, and the anti -falling mechanism is in the counterweight failure automatic trigger, and the falling tendency is blocked, and this double -layer protection mechanism synergic effect, ensures that can realize physical brake under any single point failure condition, solves the synchronous belt and breaks, and the technical problem of protective glass falling, and smashes the technical problem of the operating personnel.

Description

Technical Field

[0001] This utility model relates to the field of safety protection, specifically a fume hood anti-fall mechanism. Background Technology

[0002] A laboratory fume hood is a device used for exhaust ventilation in laboratories. Also known as a fume hood, it is one of the most common pieces of equipment in laboratories. Its primary function is exhaust ventilation. In chemical laboratories, various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are generated during experiments. To protect the safety of users and prevent pollutants from spreading into the laboratory, fume hoods are used near the source of pollution.

[0003] When conducting experiments using corrosive liquids or in situations where toxic or harmful gases may be generated during the experiment, it is usually necessary to operate inside a fume hood. The front side of the fume hood is equipped with a protective window that can slide up and down. Existing protective windows are generally connected to counterweights via a timing belt. However, if the timing belt breaks during the experiment, the protective glass will fall and hit the experimental personnel who are operating the experiment, causing a serious safety accident. Summary of the Invention

[0004] Therefore, the purpose of this utility model is to provide a fume hood anti-fall mechanism to solve the technical problem that when the synchronous belt breaks, the protective window will fall and hit the experimental personnel who are operating it, causing a serious safety accident.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fume hood anti-fall mechanism, comprising a cabinet body, a tightening wheel rotatably connected to the outer wall of the cabinet body, the tightening wheel being rotatably connected to a rubber wheel via a screw penetrating the cabinet body, a protective glass being slidably connected to the outer wall of the rubber wheel, and an anti-fall mechanism being fixedly connected to the outer wall of the protective glass, the anti-fall mechanism comprising a rack plate, a brake rack, and a mounting plate base, a brake rack being fixedly installed inside the mounting plate base, one end of the brake rack being movably connected to the rack plate, and one side of the rack plate being fixedly connected to the cabinet body.

[0006] By adopting the above technical solution, a fall protection mechanism is fixedly installed on the left side of the protective glass. The sliding locking plate is connected to a synchronous belt. When the protective glass rises, the counterweight connected to the synchronous belt assists the protective glass in rising. The inner wall of the right side of the protective glass is equipped with a rubber wheel that abuts against the glass. The rubber wheel is fixed on a screw. The screw passes through the cabinet and is rotatably connected to an external tightening wheel. When the protective glass rises to the designated position, the tightening wheel is tightened, so that the screw cannot rotate, and the rubber wheel cannot rotate as well. When the connected synchronous belt and counterweight malfunction, and the protective glass slides down, the stationary rubber wheel generates friction on the protective glass, slowing down the glass's descent speed and giving the experimenters time to react.

[0007] Furthermore, a protective glass is slidably connected inside the cabinet, and an anti-collision base is fixedly connected to the bottom of the protective glass. Two sets of handles are fixedly connected to one side of the anti-collision base, and the two sets of handles serve to lift the protective glass by applying force.

[0008] By adopting the above technical solution, a crash-resistant base is fixedly connected to the bottom of the protective glass. The crash-resistant base is in direct contact with the work platform to prevent the protective glass from falling directly and damaging the platform or the protective glass itself. Two sets of handles are fixedly connected to the crash-resistant base, and the protective glass is lifted up by the handles during the experiment.

[0009] Furthermore, the fall protection mechanism also includes a tension spring, a sliding locking plate, and a mounting plate cover. The tension spring is movably connected to the mounting plate cover, and the mounting plate cover is fixedly connected to the mounting plate base by screws.

[0010] By adopting the above technical solution, when the protective glass begins to fall after the timing belt is disconnected, the sliding lock plate loses the tension of the counterweight, the tension spring begins to rebound, and the brake rack slides down along the inclined groove on the sliding lock plate. The protruding teeth extend from between the mounting plate cover and the mounting plate base and engage with the rack plate, thereby preventing the protective window from falling. At the same time, under the action of the weight of the protective window, the tension spring always maintains the limit on the sliding lock plate, thereby keeping the brake rack in an extended state and enhancing the stability of the protective window during the fall prevention process.

[0011] Furthermore, a control panel is fixedly connected to the cabinet surface, and the control panel is used to control the power supply.

[0012] By adopting the above technical solution, it is necessary to inspect the exterior of the fume hood to check for any damage, ensure the power is on, turn on the lighting equipment inside the hood via the control panel, then start the fan and check the ventilation. Once the preparation is complete, the hood will be ready.

[0013] In summary, the present invention has the following main advantages:

[0014] The anti-collision base prevents the glass from directly impacting the work platform and causing damage, improving the equipment's durability. The handle structure combined with counterweights assists in lifting, significantly reducing the physical burden on operators when lifting the protective glass. A dual safety mechanism—rubber wheel friction braking and a mechanical anti-fall device—provides protection. When the timing belt unexpectedly breaks, causing the protective glass to fall, the stationary rubber wheel immediately generates frictional resistance, effectively slowing the glass's descent. Simultaneously, the anti-fall mechanism automatically triggers the instant the counterweight fails, with the tension spring driving the brake rack down the inclined groove, causing its protruding teeth to quickly extend and tightly engage with the rack plate, forming a rigid lock and completely stopping the fall. This dual protection mechanism works synergistically to ensure physical braking in the event of any single-point failure, greatly eliminating the risk of the protective glass falling and injuring operators. Furthermore, the continuous limiting force provided by the tension spring ensures the stability of the braking state, and the adjustable tightening wheel design allows for adjustable rubber wheel clamping force, further enhancing system reliability and adaptability. The overall structure achieves inherent safety protection while improving operational convenience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance of the present utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the fall protection mechanism of this utility model;

[0018] Figure 4 This is a rear view of the fall arrest mechanism of this utility model;

[0019] Figure 5 This is a schematic diagram of the internal structure of the fall protection mechanism of this utility model.

[0020] In the diagram: 1. Cabinet; 101. Protective glass; 102. Anti-collision base; 103. Handle; 104. Control panel; 2. Anti-fall mechanism; 201. Rack plate; 202. Tension spring; 203. Sliding lock plate; 204. Mounting plate cover; 205. Mounting plate base; 206. Brake rack; 3. Tightening wheel; 4. Rubber wheel. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] The embodiments of this utility model will be described below based on its overall structure.

[0023] A fume hood fall protection mechanism, such as Figure 1-5As shown, the device includes a cabinet 1. A tightening wheel 3 is rotatably connected to the outer wall of the cabinet 1. The tightening wheel 3 is rotatably connected to a rubber wheel 4 via a screw that passes through the cabinet 1. A protective glass 101 is slidably connected to the outer wall of the rubber wheel 4. A fall prevention mechanism 2 is fixedly connected to the outer wall of the protective glass 101. The fall prevention mechanism 2 consists of a rack plate 201, a brake rack 206, and a mounting plate base 205. The brake rack 206 is fixedly installed inside the mounting plate base 205. One end of the brake rack 206 is movably connected to the rack plate 201, and one side of the rack plate 201 is fixedly connected to the cabinet 1.

[0024] The protective glass 101 is fixedly equipped with a fall protection mechanism 2 on the left side. The sliding locking plate 203 is connected to a synchronous belt. When the protective glass 101 rises, the counterweight connected to the synchronous belt assists the protective glass 101 in rising. The inner wall of the right side of the protective glass 101 is provided with a rubber wheel 4 that abuts against the glass. The rubber wheel 4 is fixed on a screw. The screw passes through the cabinet 1 and is rotatably connected to the external tightening wheel 3. When the protective glass 101 rises to the designated position, the tightening wheel 3 is tightened so that the screw cannot rotate, and the rubber wheel 4 cannot rotate either. When the connected synchronous belt and counterweight malfunction and the protective glass 101 slides down, the stationary rubber wheel 4 generates friction on the protective glass 101, slowing down the descent speed of the glass and giving the experimenters room to react.

[0025] Please see Figure 1 and Figure 2 Inside the cabinet 1, a protective glass 101 is slidably connected. A crash base 102 is fixedly connected to the bottom of the protective glass 101. Two sets of handles 103 are fixedly connected to one side of the crash base 102. The two sets of handles 103 serve to lift the protective glass 101 by applying force.

[0026] The protective glass 101 is fixedly connected to the bottom of the anti-collision base 101. The anti-collision base 101 is in direct contact with the work platform to prevent the protective glass 101 from falling directly and damaging the platform or the protective glass 101 itself. Two sets of handles 103 are fixedly connected to the anti-collision base 101. During the experiment, the protective glass 101 is lifted by the handles 103.

[0027] Please see Figure 3 , Figure 4 and Figure 5 The fall protection mechanism 2 also includes a tension spring 202, a sliding locking plate 203, and a mounting plate cover 204. The tension spring 202 is movably connected to the mounting plate cover 204, and the mounting plate cover 204 is fixedly connected to the mounting plate base 205 by screws.

[0028] When the protective glass 101 begins to fall after the timing belt is disconnected, the sliding locking plate 203 loses the tension of the counterweight, the tension spring 202 begins to rebound, and the brake rack 206 slides down the sliding locking plate 203 along the inclined groove. The protruding teeth extend from between the mounting plate cover 204 and the mounting plate base 205 and engage with the rack plate 201, thereby preventing the protective window from falling. At the same time, under the action of the weight of the protective window, the tension spring 202 always maintains the limit on the sliding locking plate 203, thereby keeping the brake rack 206 in an extended state and enhancing the stability of the protective window during the fall prevention process.

[0029] The working principle of this utility model is as follows: When conducting experiments, the experimenter first needs to inspect the exterior of the fume hood to check for any damage and whether the power supply is connected. Then, the lighting equipment inside the hood is turned on through the control panel 104, and the fan is started to check the ventilation. Once the preparation is complete.

[0030] The experiment must be conducted inside the cabinet. A crash base 101 is fixedly connected to the bottom of the protective glass 101. The crash base 101 is in direct contact with the work platform to prevent the protective glass 101 from falling and damaging the platform or the glass itself. Two sets of handles 103 are fixedly connected to the crash base 101. During the experiment, the protective glass 101 is lifted using the handles 103. A fall arrest mechanism 2 is fixedly installed on the left side of the protective glass 101, in which a sliding locking plate 203 is connected to a synchronous belt. When the protective glass 101 rises, it moves in sync with the synchronous belt. The protective glass 101 is raised by a counterweight. The inner right wall of the protective glass 101 is equipped with a rubber wheel 4 that abuts against the glass. The rubber wheel 4 is fixed on a screw. The screw passes through the cabinet 1 and is rotatably connected to the external tightening wheel 3. When the protective glass 101 is raised to the designated position, the tightening wheel 3 is tightened so that the screw cannot rotate and the rubber wheel 4 cannot rotate. When the connected timing belt and counterweight malfunction and the protective glass 101 slides down, the stationary rubber wheel 4 generates friction on the protective glass 101, slowing down the descent speed of the glass and giving the experimenters room to react.

[0031] When the protective glass 101 begins to fall after the timing belt is disconnected, the sliding locking plate 203 loses the tension of the counterweight, the tension spring 202 begins to rebound, and the brake rack 206 slides down along the inclined groove on the sliding locking plate 203. The protruding teeth extend from between the mounting plate cover 204 and the mounting plate base 205 and engage with the rack plate 201, thereby preventing the protective window from falling. At the same time, under the action of the weight of the protective window, the tension spring 202 always maintains the limit on the sliding locking plate 203, thereby keeping the brake rack 206 in an extended state and enhancing the stability of the protective window during the fall prevention process.

[0032] The dual protection of rubber wheel 4 and fall arrestor 2 effectively prevents the protective window from falling and injuring the operator.

[0033] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A fume hood anti-fall mechanism, comprising a cabinet body (1), characterized in that: The outer wall of the cabinet (1) is rotatably connected to a tightening wheel (3). The tightening wheel (3) is rotatably connected to a rubber wheel (4) through a screw that passes through the cabinet (1). The outer wall of the rubber wheel (4) is slidably connected to a protective glass (101). The outer wall of the protective glass (101) is fixedly connected to an anti-fall mechanism (2). The anti-fall mechanism (2) is composed of a rack plate (201), a brake rack (206), and a mounting plate base (205). The mounting plate base (205) is fixedly installed with a brake rack (206). One end of the brake rack (206) is movably connected to the rack plate (201), and one side of the rack plate (201) is fixedly connected to the cabinet (1).

2. The fume hood anti-fall mechanism according to claim 1, characterized in that: The cabinet (1) has a sliding connection to a protective glass (101), and the bottom of the protective glass (101) is fixedly connected to an anti-collision base (102).

3. The fume hood anti-fall mechanism according to claim 1, characterized in that: The fall protection mechanism (2) also includes a tension spring (202), a sliding locking plate (203), and a mounting plate cover (204). The tension spring (202) is movably connected to the mounting plate cover (204) through its outer wall. The mounting plate cover (204) is fixedly connected to the mounting plate base (205) by screws.

4. The fume hood anti-fall mechanism according to claim 2, characterized in that: Two sets of handles (103) are fixedly connected to one side of the anti-collision base (102). The two sets of handles (103) serve to lift the protective glass (101) by applying force.

5. The fume hood anti-fall mechanism according to claim 1, characterized in that: A control panel (104) is fixedly connected to the tabletop of the cabinet (1), and the control panel (104) is used to control the power supply.

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