JP2535457Y2 - Hood automatic opening and closing sash - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a hood (or chamber) with an open / close sash for handling specific chemical substances, organic solvents, radioactive substances, etc., a clean hood having a sash (door) for using the hood with clean air, The present invention relates to a safety hood with a sash used for a genetic recombination operation and the like.

[0002]

2. Description of the Related Art In general, sashes for opening and closing work openings of various hoods installed in laboratories and laboratories of laboratories (schools), hospitals, pharmaceutical companies, factories, etc., are generally guided left and right by pillars on both sides of the work openings. The wire connected to both ends of the sash is hung on a pulley, and a counterweight (weight) substantially equal to half of the total weight of the sash is attached to the other end of the wire, and It could be opened and closed lightly in the direction. At present, the opening and closing handle is provided at the lower end of the sash, and the work opening surface is opened and closed by the human power of the operator.

(1) For this reason, when the line of action of the sash opening / closing power of the worker does not pass through the center of gravity of the sash when opening and closing the sash, the sash tilts, and the frictional force between the guide and both sides of the sash is large. As a result, the opening / closing height of the sash becomes uneven compared to normal operation. There is more power than the human power required to open and close the sash normally. In rare cases, opening and closing the sash becomes difficult. In general, in order to facilitate opening and closing of the sash, the operator uses both hands to operate the opening and closing handle at the lower end of the sash to balance the sash and move the sash up and down.

(2) In the work of handling other substances such as a specific chemical substance, an organic solvent, a radioactive substance, etc., when the sample is moved from another place and put in the hood for experimentation / research, the work opening of the hood is required. The sash provided on the surface is closed,
When the height of the sash is halfway for carrying the substance to be handled into the hood, the worker puts the substance to be handled in the hood, puts it on the workbench (laboratory bench) installed near the hood, The hood sash must be opened with both hands. When the above procedure is taken, if there is a substance that evaporates or evaporates in the sample placed on the work table, the sample is placed in the air of the working environment (laboratory) while it is placed on the work table. There is a possibility that the substance is scattered and diffused to deteriorate the working environment.

(3) When the sash is in the closed state,
If various operations such as reaction, extraction, stirring, etc. on substances for research are urgently changed or stopped, an accident may occur if the sash cannot be opened and closed smoothly. It could be. There is such a problem.

[0006]

Therefore, in order to solve the above-mentioned problems, the present invention employs a sash provided on the work opening surface of the hood. It can be opened and closed smoothly even when it does not pass, and can be automatically opened and closed at any intermediate opening and closing position without using human power of the operator, and in case of emergency, use the handle provided on the sash An object of the present invention is to provide a hood automatic opening / closing sash provided with a sash opening / closing device that can be easily opened / closed by human power of an operator.

[0007]

The present invention has the following components in order to achieve the above object. (1) Open the front of the hood to form a working opening,
Guided on both sides by the left and right pillars, provided with an opening and closing sash that can reciprocate up and down, the other end of the hanging wire attached to the upper edge left and right ends of the opening and closing sash,
While being wound around a drum fixed to a common rotating shaft supported directly above, the drum rotating shaft has substantially the same torque as the torque generated based on the weight of the sash applied to a wire,
An automatic opening / closing sash for a hood, wherein the shaft is connected to an output shaft of an electric motor via a transmission while being applied with a balance torque in the same size and in the opposite direction, so that the hood can be driven forward and reverse.

(2) At least one sensor is provided along a reciprocating movement locus of the sash, the sensor detects the open / close position of the sash, and is operated immediately before each end point of the reciprocating movement of the sash by the sensor. The hood automatic opening / closing sash according to the above (1), wherein the supply of electric power to the drive motor is cut off.

[0009]

[Function] (1) Automatic opening and closing When the "open button" for opening the working opening of the hood is operated to supply power to the drive motor, the motor rotates forward,
The rotation is transmitted to the drum rotation shaft via a speed reducer / power transmission mechanism. Connected to the upper edge both ends of the sash, the wire for suspending the sash, the other end is wound around the drum peripheral surface fixed to the rotating shaft, then its free end is extended,
At its end, a weight (counter weight) of approximately half the weight of the sash is suspended, and thereby, the same as the torque generated on the drum rotating shaft based on the weight of the unit sash,
The balance torque in the opposite direction is applied to the drum rotation shaft.

With such a mechanism, despite the fact that the wire is supported on the drum peripheral surface and the weight of the sash is received,
In the stationary state, the torque applied to the drum rotating shaft is assumed to be almost zero. If the wire suspending the sash is a chain or a timing belt-shaped wrapping conductive member, the drum is accordingly:
Use sprockets or toothed pulleys. The above-described sash vertical drum system and the drum, wire, and weight mechanism for applying a balance torque to the drum rotating shaft have the same effect even if they are mutually independent systems. In short, it is only necessary that the above-mentioned predetermined balance torque can be applied to the drum rotating shaft.

At this time, the diameters of the sash up-and-down drum and the drum for giving the balance torque to the drum rotating shaft can be mutually changed. That is, the weight of the counterbalance weight can be reduced by making the diameter of the drum for giving the balance torque to the drum rotation shaft larger than that of the sash vertical drum. Further, the drum, wire, and weight mechanism for giving a predetermined balance torque can be combined into one set.

The above-mentioned balance torque generating means can be replaced by a mainspring (constant load spring) formed by winding a thin steel strip into a spiral spring shape. This eliminates the need for weight equipment, reduces the inertia capacity of the sash when the sash is opened and closed, and increases the opening and closing acceleration of the sash with the same power, but requires attention to durability performance. May. The driving torque of the electric motor turns the drum rotating shaft via the transmission device, and the sash rises on the member against the inertial force of the sash and the weight via the drum and the wire and the frictional force between the sash guide and the sash guide. Move in the direction. that time,
Since the left and right drums are driven synchronously by one rotating shaft, the sash does not tilt and move up and down. Therefore, both sides of the sash can reciprocate smoothly without engaging with the guide.

Immediately before the sash fully opens the working opening and moves to the top dead center, the moving operation is detected by a limit switch, a photoelectric sensor, a proximity switch, or the like, and the electric circuit of the "open button" is opened to open the electric motor. Is stopped, and the sash is moved to the top dead center position by inertia. At this time, the weight (counter weight) may be set in advance so that the lower limit position of the reciprocation can be adjusted, and the inertial force of the weight may be reduced. Thereby, the contact of the sash with the upper limit stopper is reduced. If you want to arbitrarily adjust the opening of the sash, open the electric circuit by releasing the "open button",
The driving of the sash in the opening direction is stopped, and the movement of the sash is stopped so as to occupy a considerable position of the opening. At this time, it is also possible to install and place an electromagnetic brake if necessary, and to fix the open / close position of the sash.

When the operator wants to close the working opening, he pushes the "close button", rotates the drive motor in the opposite direction through a circuit other than the above-mentioned circuit, and moves the sash to the bottom dead center through a process substantially similar to that described above. Move to the position. In the above operation, if a "reverse button" is provided to operate the reversing device provided in the torque transmission mechanism of the electric motor, then the sash can be closed as described above and above. . However, in that case, it is necessary to switch the automatic stop circuit.

(2) In the case of manual opening and closing When the power supply to the hood opening / closing device is stopped,
When an electrical or mechanical member of the switchgear breaks down, or in preparation for an emergency fluctuation of the experimental process, manually
The opening sash must be able to move up and down. In the present invention, the work opening surface can be relatively easily opened and closed as long as the wire for suspending the sash, the drum around which the wire is wound, the drum rotating shaft bearing, and the counterweight structure are not damaged.

That is, if the reduction ratio of the speed reducer provided in the drive motor is reduced, the resistance force caused by the rotation of the rotor of the drive motor by an external input interlocked with the manual movement of the sash up and down, Not large enough to make it difficult to move the sash manually. Of course, at that time, the weight of the sash itself is canceled by the counterweight (weight), so the main resistance applied to the hand when opening and closing the sash is the inertial force between the sash and the weight and the rotation of the motor rotor. It is generated by power. And the power to turn the rotor of the motor is not very large. The situation described above is the same in both cases of opening and closing the working opening and moving the sash up and down.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The structure of each member constituting the embodiment can be determined by those skilled in the art within the technical level in the industry at the time of filing the present application. Since the present invention can be easily modified, the gist of the present invention should not be limitedly interpreted based only on the specific configuration of the present embodiment without showing a special reason. FIG. 1 is a plan view of an essential part of an embodiment of the present invention, and FIGS.
FIG. 1 is a cross-sectional view taken along arrows A and BB. In FIG. A guide provided to support the left and right sides of the sash in the sliding groove to guide the sash 1 up and down;

3 is connected to the left and right ends of the upper edge of the sash 1,
A pair of wires 4 for suspending the sash 1 are a pair of double drums fixed to a rotating shaft 5, and a perpendicular line contacting a part of the peripheral surface of the drum 4 coincides with the suspension wire 3 of the sash. The weight of the sash 1 is supported by the drum 4 and the rotating shaft 5 via the wire so that the other end of the wire 3 is wound around the peripheral surface of the drum 4. 6 is a bearing for the rotating shaft 5. 7 is a wire wound around the double drum 4 having the same diameter.
The other end of the sash 1 is connected to a weight 9 (counterweight), which is approximately half the weight of the sash 1 after being wound around the pulley 8.

The torque generated by these weights around the rotation axis 5 balances the torque based on the weight of the sash 1 and the torque based on the weight 9. Therefore, the influence of the weight of the sash 1 which becomes a resistance force when the sash 1 reciprocates up and down does not exclude its inertia (in this case, the friction of each part is ignored). That is, as long as the acceleration is not increased, the sash 1 can be opened and closed lightly. For that purpose, it is necessary to reduce sliding friction between the sash 1 and the guide 2 as much as possible.

In this embodiment, the drum 4 is formed to have the same diameter in a double manner. The diameter of the drum 4 on which the wire 7 and the weight 9 are wound and suspended is larger. Is also good. This makes it possible to make the weight 9 lighter than the reference amount. In the present embodiment, the drum 4
Is doubled to distinguish the wrapped wires into the sash 1 and the weight 9 side so that the wires do not become entangled. However, functionally, both wires are combined into a single wire. It is only necessary to wind this around the periphery of the drum 4 a plurality of times (about twice) and place the power transmission action between the drum and the wire at or above a predetermined level.

As another means, a rotary torque mechanism using a constant load spring (for example, Conston) may be provided instead of the torque balance using the weight 9 for the drum 4. In short, the means for canceling the torque around the shaft 5 caused by the weight of the sash 1 is provided on the shaft 5. Therefore, it is not always necessary to provide two torque balance weights 9.

Reference numeral 10 denotes a pulley fixed to the rotating shaft 5, and an endless belt, if necessary, a timing belt between the pulley 10 and a pulley 12 connected to an output shaft of a motor (capacity of about 10 watts). 13 are stretched. Reference numeral 14 denotes a reduction gear (approximately 1:15) attached to the electric motor, and reference numeral 15 denotes a coupling that connects the output shaft of the reduction gear and the pulley 12. For details of the operation method and operation of this embodiment having the above-described structure, refer to the detailed description in the section of [Operation] described above.

[0023]

[Effect of the Invention] The present invention has the structure and operation as described above. (1) Since the sash can be opened and closed mechanically only by operating the button, Therefore, the hood can be used even when the hand is not available. For this reason, compared with the case where the sample is once placed on another table and the sash is operated, diffusion of the harmful substance into the working environment is reduced. (2) The weight of the sash is connected to a counterweight that balances, so that the sash can be moved up and down lightly. In addition, the sash can be smoothly opened and closed using a relatively small capacity motor.

(3) Since both ends of the upper edge of the horizontally long sash are suspended by wires and the pair of wires are moved up and down in synchronization, no support is generated between both sides of the sash and the guide groove. Even a heavy sash can slide up and down very smoothly. (4) Since the reduction ratio of the reduction gear with an electric motor is relatively small, and a counterweight is provided for the weight of the sash, even when the sash is quickly moved up and down by human power in an emergency, it is relatively small. The opening and closing operation can be easily performed by human power without generating large resistance. For example, this type of hood is provided with a sash opening / closing device having a novel configuration, and can provide a special operation and effect that cannot be expected from a conventionally known sash opening / closing device.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an embodiment of an automatic opening / closing sash of the present invention.

FIG. 2 is a front sectional view taken along the line AA in FIG.

FIG. 3 is a side sectional view taken along the line BB in FIG. 1;

[Explanation of symbols]

 1 Sash 2 Sash guide 3 Wire 4 Drum 5 Rotary shaft 6 Bearing 7 Wire 8 Pulley 9 Weight (counter weight) 10 Pulley 11 Motor 12 Pulley 13 Belt 14 Reduction gear 15 Coupling.

Claims (2)

(57) [Scope of request for utility model registration] 1. An opening for opening a front surface of a hood to form a working opening, and an opening / closing sash which is guided on both sides by left and right pillars and which can reciprocate vertically, wherein an upper edge of the opening / closing sash is provided. The other ends of the hanging wires attached to the left and right ends are wound around a drum fixed to a common rotation shaft supported directly above, respectively, and the drum rotation shaft is
While applying a balance torque of substantially the same magnitude as the torque generated based on the weight of the opening and closing sash applied to the wire and rotating in the opposite direction, the shaft is connected to the output shaft of the electric motor via a transmission, and Automatic opening / closing sash for the hood, which can be driven in reverse rotation. 2. A sash drive system comprising at least one sensor along a reciprocating trajectory of the sash, wherein the sensor detects an open / close position of the sash and is operated immediately before each end point of the sash reciprocation process. The hood automatic opening / closing sash according to claim 1, wherein the supply of electric power to the motor is interrupted.