JPS6312997B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to a pneumatic door opening/closing drive device that manually opens the door in normal times and automatically opens the closed door in an emergency. The door is made smaller and its maximum value is also made smaller so that the door can be opened easily. [Prior Art] The door used in the present invention is normally closed, such as the revolving door shown in Figs. It has a function that allows the door to be opened manually even during normal times. As shown in FIG. 6, a drive device 104 that has been commonly used in the past includes a lever 103 fixed to a door opening/closing shaft 102 and a piston rod 10 of a pneumatic door opening/closing cylinder 105.
6 are pin-coupled via a pin 109, and the door opening/closing cylinder 105 is swingable around the fixed pin 108, and is connected to a pressurized air supply pipe 116, an electromagnetic switching valve 118, and a reservoir (not shown). to a pneumatic pressure source (not shown). Pressure air is constantly supplied to the cylinder chamber 115 of the door opening/closing cylinder 105, and the piston compresses the spring 114 in the cylinder to project the piston rod 106. The lever 103 is positioned as shown by the solid line, and the door opening/closing shaft 102 The door is rotated counterclockwise to close the door, and the closing force is maintained by air pressure. The spring chamber communicates with the atmosphere by a hole 117. In the event of an emergency, an emergency electrical signal is transmitted to the electromagnetic switching valve 118,
The valve switches to release the pressurized air in the cylinder chamber 115 to the atmosphere, and the piston rod 106 releases the pressurized air in the cylinder chamber 115 to the atmosphere.
14, the lever 103 rotates to the position indicated by the dotted line in the figure, and the door opening/closing shaft 102 rotates clockwise to open the door. To manually open the door during normal times, the door is manually pushed and the lever 103 is rotated. At this time, the piston is pushed in against the air pressure within the cylinder chamber 115. [Problems to be Solved by the Invention] In order to open the door from the closed position, the lever 103 is rotated through the γ angle (approximately 90 degrees), that is, from the closed position to the open position, as shown in FIG. , F ₀ is the force obtained by subtracting the restoring force of the spring from the cylinder reaction force when pushing the piston rod 106 into the cylinder, C is the distance between the pin 109 and the door opening/closing shaft 102, and the distance between the lever 103 and the piston rod 106 as shown in the figure is F 0 . If _{the angle formed by}
A rotational moment must be applied against C. The resistance moment M ₀ increases and decreases between the rotation angle γ of the lever 103 from the door closing position to the door opening position, and reaches its maximum value when the angle θ ₀ is 90° halfway, and the restoring force of the spring 114 increases as the door opening angle increases. The cylinder reaction force is not constant. Opening moment M ₀ required to open the door with this conventional device
(moment of resistance) is as follows since the angle θ ₀ must be changed from 30° to 120° in order to open the lever 103 by 90°. However, the target holding force for the door when closed is 3 kg/m.

[Means for solving problems]

Therefore, in view of the above problems, the required door holding force is maintained when the door is closed, the maximum value of the door opening force required to open the door is reduced, and the fluctuation of the door opening force is reduced. This is a technical issue. The means to solve this technical problem was to connect a cylinder chamber to an air pressure source to apply air pressure in the direction of closing the door via a piston rod, and also provide a spring to act in the direction of opening the door. In the door opening/closing drive device, the piston rod is connected to the middle part of a second lever whose one end is rotatably supported, and one end of the first lever, which is shorter than the length of the second lever, is fixed to the opening/closing shaft of the door. , the other ends of the first lever and the second lever are connected by a link. [Function] With the above means, under normal conditions, pressurized air from the air pressure source is supplied to the cylinder chamber via the switching valve, and the air pressure in the cylinder chamber operates the piston rod to swing the second lever, This swing causes the first lever to swing via the link, and at the same time, the opening/closing shaft of the door rotates, so that the door is closed and maintained in that state. When manually opening the door, the manual force applied to the door is transmitted to the first lever via the opening/closing shaft, and then transmitted from the second lever to the piston rod via the link to counteract the pressurized air in the cylinder chamber. Therefore, the door is opened manually against the air pressure in the cylinder chamber. When a person passes through the door and the manual force is lost, the pressure air in the cylinder chamber causes the second lever to swing via the piston rod, and the first lever swings via the link, at the same time the opening/closing shaft rotates. and close the door. [Embodiment] An embodiment of the present invention will be described based on FIGS. 3 to 5. 4 is a housing containing a drive mechanism, 2 is a door opening/closing shaft, and 3 is a first door fixed to this opening/closing shaft 2.
It's a lever. The piston rod 6 of the pneumatic door opening/closing cylinder 5 is rotatably connected to the middle part of a second lever 12, which is longer than the first lever 3, by a pin 7, and the second lever 12 is fixed. It is attached to the housing 4 so as to be swingable about a pin 13. The link 11 has one end connected to the tip of the first lever 3 with a pin 9, and the other end connected to the second lever 3.
It is pin-coupled to the tip of the lever 12 with a pin 10. 8 is a housing 4 that allows the door opening/closing cylinder 5 to swing freely.
16 is a pressure air supply pipe, 17 is a through hole with a throttle, 18 is an electromagnetic switching valve,
20 is a connection port connected to an air pressure source 21. Normally, the electromagnetic switching valve 18 is switched to the position shown in FIG. The door is pressed and moved to the left against the spring 14, and the door is closed via the second lever 12, the link 11, and the first lever 3. In the event of a fire emergency, an emergency electric signal is sent to the electromagnetic switching valve 1.
8, this electromagnetic switching valve switches and the pressurized air in the cylinder chamber 15 is discharged to the atmosphere from the electromagnetic switching valve 18, and the piston moves to the right by the spring force, and the second lever 12 and the link 11 , first lever 3
The door is rotated to the open position via the , and the door opens automatically to form an evacuation route. In order to return the door to the closed position again, it is sufficient to switch the electromagnetic switching valve 18 to the position shown in FIG. movement, second lever 12, link 11, first lever 3
Automatically close the door via. When opening the door manually, the electromagnetic switching valve 18 remains in the state shown in FIG. Move the door to the right against the air pressure of 15 to open the door. When the door is opened and a person passes through and then releases the door, the piston rod 6 moves to the left due to the pressure air in the cylinder chamber 15, and the second lever 12, the link 11, and the first lever 3 are moved.
The door closes through. At this time, the moving speed of the piston rod 6 is controlled by an appropriate throttle provided in the exhaust hole 17, so that the door can be closed smoothly. Next, the configuration of the above-described embodiment will be described in more detail. In FIG. 5, the distance from the center of the fixed pin 13 supporting the second lever 12 to the center of the connecting pin 7 of the piston rod 6 is a, and the distance from the center of the link 1
1 to the center of the coupling pin 10 is b, and the second
The angle between the lever 12 and the link 11 is α, the angle between the first lever 3 and the link 11 is θ, the angle between the piston rod 6 and the second lever 12 is β, from the time when the first lever 3 closes the door to when the door opens. The rotation angle of the second lever 12 is γ, the rotation angle of the second lever 12 is Ψ, the reaction force transmitted to the piston rod 6 is F, the vertical component of the second lever 12 on the pin 7 is F ₁ , and the same rotation angle on the pin 10 is F 1 . If the vertical component force is F ₂ , the axial force of the link 11 is F ₃ , and the vertical component force of the first lever on the pin 9 is F ₄ , then F ₁ = Fsinβ F ₂ = a/b・F ₁ = a/b・Fsinβ F ₃ = F ₂ 1/sinα=a/b・Fsinβ/sinα F ₄ = F ₃ sinθ=a/b・F・sinθ・sinβ/sinα Therefore, the reaction force moment around the door opening/closing axis M becomes M=a/b・F・sinθ・sinβ/sinα×C (however, F=F'-P). F': Actual measured force due to air pressure acting on the piston P: Restoration force of the spring 14 Therefore, the actual measured values of each angle from the door closing position to the door opening position, F, and the door opening (reaction force) moment at each position are as shown in the table below. It is. However, the door holding force when closed is 3 kg・m. Here, F is the reaction force when the cylinder diameter is 80 mm and the air pressure is 5 Kg/ ^cm3 , a = 60 mm, b = 95 mm, and C = 63.5.
mm, link 11 = 120mm, spring force when closing door = 122
Kg, spring force when opening the door = 108Kg, β when closing the door = 70°,
θ=45°, α=110°, γ=0, β=110° when the door is open,
Set θ=135°, α=70°, and γ=90°.

〔effect〕

As is clear from the above, according to the present invention, it is possible to reduce the fluctuation of the opening moment during manual opening/closing and to suppress the maximum value thereof, so that the door can be opened easily and smoothly manually. Can be done. In addition, the conventional device (moment M ₀ = F ₀ sinθ ₀ ×
In C), if F ₀ is made small in order to keep the maximum value of the door opening moment M ₀ low, the force to close the open door will also be reduced, so there is a risk that it will not close due to the resistance of each mechanism part or wind pressure. Even when the door is closed, the holding force of the door is small, causing phenomena such as the door wobbling. Furthermore, when C is made smaller, the force for opening a closed door also becomes smaller, and the force for holding the door when the door is closed also becomes smaller. However, in the present invention, since the structure is configured as described above, the door opening moment can be suppressed to a low level while maintaining the minimum door holding force when the door is closed.

[Brief explanation of the drawing]

Fig. 1 is a front view of an example of the door, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a schematic diagram showing an embodiment of the present invention, Fig. 4 is an operational view of the same, and Fig. 5 is a schematic diagram showing an embodiment of the present invention. 6 is a schematic diagram of the conventional device, FIG. 7 is a diagram illustrating the same operation, and FIG. 8 is a comparison diagram of the door opening moment of this embodiment and the conventional device. 1... Door, 2... Door opening/closing shaft, 3... First lever, 4... Housing, 5... Door opening/closing cylinder, 6...
Piston rod, 11... link, 12... second
Lever, 14...spring.

Claims (1)

[Claims] 1. A door opening/closing drive device in which a cylinder chamber for applying air pressure in the direction of closing the door via a piston rod is connected to an air pressure source, and a spring is provided for applying air pressure in the direction of opening the door, one end of which is rotatable. The piston rod is connected to the middle part of a second lever that is pivotally supported by the door, one end of the first lever shorter than the length of the second lever is fixed to the opening/closing shaft of the door, and each of the first lever and the second lever is A door opening/closing drive device characterized in that the other end is connected with a link.