JP2014074313A - Air type shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air type shutter device that can efficiently and securely opens and closes a sheet by two air cylinders without using any electric motor and can be manufactured with simple and inexpensive constitution.SOLUTION: There is provided an opening/closing device 7 provided, by a sheet drum 5, with a rotating belt 31 and a reversing belt 32 fitted to piston rods 34 of an air type rotating cylinder 11a and a reversing cylinder 11b and a rotating pulley 8a and a reversing pulley 8b wound with and delivering rotating belt 31 and reversing belt 32, the opening/closing device being configured to wind and deliver a sheet 2 by placing the rotating cylinder 11a and reversing cylinder 11b alternately in expanding/contracting operation and thereby rotating and reversing the sheet drum 5.

Description

  The present invention relates to an air-type shutter device that can be installed at an entrance / exit of a building such as a factory or a warehouse.

In general, a sheet shutter (shutter device) installed at a doorway or partition part of a building such as a factory or a warehouse is a sheet shutter on which a sheet (shutter) is wound so that the sheet can be wound and fed out by a forward and reverse rotation by an electric motor. A method of moving up and down along the guide rails on both sides is widely known. A shutter device equipped with such an electric motor type opening / closing device is likely to cause a short circuit or a spark due to discharge when the shutter is operated. For example, a chemical factory or underground passage with various explosive gas generation, various construction sites, etc. Then, it cannot be used as it is.
On the other hand, as a shutter device that can be used in a place with the generation of explosive gas, the seat drum 5 is driven forward and reverse by an air-driven air motor to raise and lower the shutter without using an electric motor, An air-type opening / closing device that opens and closes an entrance / exit is already known (see, for example, Patent Document 1).
In addition, as an air-driven shutter device, a shutter that moves up and down along the guide rails on both sides via a wire rope by vertically extending and retracting a piston of an air cylinder installed along the guide rail. The device is already known (see, for example, Patent Document 2).

JP 58-69974 A Japanese Utility Model Publication No. 62-36177

The air-type switchgear disclosed in Patent Document 1 can be used as an explosion-proof shutter device because it does not use electricity, but it uses a high-priced air motor and controls forward and reverse rotation of the air motor. In addition, since control parts such as an air clutch device and a number of switching valves are required, the circuit device is complicated and expensive.
On the other hand, the air-type opening / closing device disclosed in Patent Document 2 uses a single air cylinder and a balance weight that operates and urges the shutter in the downward direction on the head of the piston, and two wires that support the left and right sides of the shutter. An inexpensive shutter that does not require an electric motor is being constructed by means such as providing a plurality of moving pulleys that pull and operate the rope in the vertical direction.

  However, since this air type opening and closing device raises the shutter by pulling two wire ropes wound around a plurality of pulleys, a large and expensive air cylinder is required, and the plurality of pulleys are used for tensioning. The long wire rope that is easily bent is accompanied by problems such as a delay in operation at the time of opening and closing and a decrease in operation followability such as a stop operation.

  A shutter device including an air-type opening / closing device using a single large air cylinder, a wire rope, and a balance weight is used to reversely open (up) in the middle of closing (lowering) the shutter. In particular, there is a problem that the inertia of the balance weight at the time of bending and operation of the wire rope hinders the smoothness of the reversing and opening operation and makes it difficult to increase the speed of raising and lowering the shutter.

  In order to solve the above-mentioned problems, the present invention is firstly provided with a seat case 4 that pivotally supports a sheet drum 5 that winds and feeds the sheet 2 so as to be rotatable forward and backward, and on the side of the seat case 4. In the seat shutter 1 having a shutter guide portion (12) for reciprocally guiding the seat 2 and opening and closing the seat 2 using air as a power source, along the shutter guide portion 12, an air-type forward rotation cylinder 11a. And a reversing cylinder 11b are provided so that each piston rod 34 can extend and retract with respect to the seat drum 5, and a forward belt 31 and a reverse belt 32 attached to each piston rod 34 are wound around the side of the seat drum 5. The forward rotation pulley 8a and the reverse rotation pulley 8b are provided so as to be freely wound and fed, and the forward rotation belt 31 wound around the forward rotation pulley 8a is connected to the forward rotation cylinder. By pulling and feeding the piston rod 34 by contraction 1a, the sheet drum 5 is rotated forward and the sheet 2 is wound and opened, while the reverse rotation belt 32 is wound around the reverse rotation pulley 8b, while the reverse rotation pulley 8b is The wound reverse rotation belt 32 is pulled out by contraction of the piston rod 34 of the reverse rotation cylinder 11b, whereby the seat drum 5 is rotated in the reverse direction and the seat 2 is extended and closed, while the forward rotation pulley 8a is moved forward. 31 is wound up to rotate the sheet drum 5 forward and backward so that the sheet 2 is taken up and fed out.

  Second, the forward rotation cylinder 11a and the reverse rotation cylinder 11b are provided along the left and right support columns 3 having shutter guide portions 12 installed on the left and right sides of the seat drum 5, and A forward rotation pulley 8a and a reverse rotation pulley 8b are provided to wind up and wind the forward rotation belt 31 on the rotation cylinder 11a side and the reverse rotation belt 32 on the reverse rotation cylinder 11b side, and the forward rotation cylinder 11a and the reverse rotation cylinder 11b. By alternately supplying air to the sheet drum 5, the sheet drum 5 is rotated forward and backward so that the sheet 2 is taken up and fed out.

  Third, a forward rotation guide pulley 37a in which a forward rotation belt 31 and a reverse rotation belt 32 wound around the forward rotation pulley 8a and the reverse rotation pulley 8b are axially supported in the vicinity of the forward rotation pulley 8a and the reverse rotation pulley 8b. And a reverse guide pulley 37b, respectively, are guided in the axial direction of the piston rods 34 of the forward rotation cylinder 11a and the reverse rotation cylinder 11b, respectively.

  Fourth, the forward rotation cylinder 11a, the forward rotation belt 31, the reverse rotation cylinder 11b, and the reverse rotation belt 32 are covered with a cover 41, and the above-mentioned cover is attached to the head of each piston rod 34 of the forward rotation cylinder 11a and the reverse rotation cylinder 11b. A guide member 49 that is slidably moved along the guide 41 is provided.

  Fifth, when the seat 2 is in the middle of closing and receives an external force R and stops abnormally, the seat 2 is supplied with air to the forward rotation cylinder 11a based on the change in air pressure in the forward rotation cylinder 11a. Is characterized by reversing and opening.

  Sixth, an air tank 56 that stores an amount of air that can open and close the seat 2 a plurality of times is connected to the forward rotation cylinder 11 a and the reverse rotation cylinder 11 b, and the air tank 56 is connected to the seat drum 5. It is characterized by being installed along the axial direction.

According to the air shutter device of the present invention configured as described above, according to the invention of claim 1, the forward rotation belt wound around the forward rotation pulley is pulled by the contraction of the piston rod of the forward rotation cylinder. By feeding, the reverse rotation belt can be wound around the reverse rotation pulley while the sheet drum is rotated forward to wind and open the sheet. On the other hand, the reverse rotation belt wound around the reverse rotation pulley is pulled out by the contraction of the piston rod of the reverse rotation cylinder, thereby reversing the seat drum and feeding and closing the seat, while rotating the forward rotation belt to the forward rotation pulley. As a result, the direction of each piston of the forward rotation cylinder and the reverse rotation cylinder can be set so as to be aligned with the direction of the seat drum along the shutter guide portion, and the same telescopic operation stroke can be provided. Thus, the forward and reverse rotation of the sheet drum can be performed, and the sheet winding and unwinding can be performed using the forward rotation cylinder and the reverse rotation cylinder having substantially the same specifications.
Therefore, the followability of the operation at the time of opening and closing the seat can be improved by the two air cylinders without using the electric motor, so that the opening and closing operation of the seat can be performed efficiently and reliably. In addition, the air-type shutter device can be manufactured with a simple and inexpensive structure.

  According to the second aspect of the present invention, the air-type opening / closing device can be configured compactly in the space around the support column. Further, since the forward rotation pulley and the reverse rotation pulley are provided separately on the left and right sides of the seat drum, maintenance work such as belt length adjustment and inspection / repair can be easily performed.

  According to the invention of claim 3, the forward rotation cylinder and the reverse rotation cylinder are not affected by changes in the winding position of the forward rotation belt and the reverse rotation belt with respect to the installation position of the seat drum and the forward rotation pulley and the reverse rotation pulley. The operation at the time of contraction of each piston can be made smooth.

  According to the fourth aspect of the present invention, the guide member slides against the wall surface in the load direction against the lateral load applied to the head of the piston rod that is expanded and contracted due to the belt swing of the forward rotation belt and the reverse rotation belt, etc. Since the lateral movement is restricted, the expansion and contraction operations of the forward rotation cylinder and the reverse rotation cylinder can be made smooth, and the piston stroke can be lengthened and the expansion and contraction speed can be easily increased.

  According to the invention of claim 5, when the seat at the time of closing is subjected to an external force due to contact with a passing body such as a car, the seat is reversed and opened from the closing stop position. Moreover, it is possible to prevent occurrence of troubles associated with contact. Further, the reverse opening operation is performed by utilizing the change in the air pressure between the normal closing operation and the abnormal closing operation of the forward rotation cylinder, so that the reverse opening control can be made simple and inexpensive.

  According to the sixth aspect of the present invention, even when air supply is not performed from the air supply unit side, the opening and closing operation of the seat can be performed an appropriate number of times. By installing the air tank along the axial direction of the seat drum, it is possible to install the air tank without increasing the size of the shutter device by utilizing the space around the seat drum, and also to change the air tank and adjust the storage pressure. It is possible to facilitate maintenance work such as.

FIG. 3 is a front view illustrating a sheet shutter to which the present invention is applied, with a part thereof broken. FIG. 2 is a left side sectional view showing a configuration of a main part of FIG. 1. FIG. 3 is a front view illustrating a configuration of a forward rotation pulley, a forward rotation pulley, and a normal rotation belt with a part thereof broken. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a front view which shows the structure of the attaching part of a normal rotation belt and the cylinder for normal rotation. It is an air control circuit diagram of a switchgear.

  An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a sheet shutter mainly shown as an example of a shutter device installed at the entrance of a building, and supports a sheet (shutter) 2 as a member for the shutter and its left and right, and guides up and down movement in the vertical direction. It is comprised by the support | pillar 3 (side frame) which is a square hollow C-shaped cross section comprised as a guide member to perform, the cylindrical sheet | seat case (seat frame) 4 etc. which accommodate the sheet | seat 2 so that winding and unwinding are possible. The column 3 is attached and fixed along a pillar or wall formed at the entrance of the building, and the seat case 4 is installed sideways along the beam or wall of the building.

  The seat case 4 of the illustrated seat shutter 1 is detachably attached via attachment members in a state where both sides thereof are placed on the left and right columns 3. In the seat case 4, a seat drum (storage and feeding device) 5 that rotates forward and backward so that the sheet 2 can be wound and unwound is supported and supported. As a result, the seat 2 is supported by the shutter guide portions formed on the left and right support columns 3 so that both sides can be moved up and down, and as the seat drum 5 rotates forward and backward, the seat 2 is moved up and down (opening and closing operation). Open and close.

  Next, the configuration of each part of the sheet shutter 1 will be described with reference to FIGS. The seat case 4 forms a hollow case chamber by detachably attaching end plates 6 a and 6 b to both sides of a cylindrical case body 6 having a square cross section in a side view, and is formed in a lower rear portion of the case body 6. The opening 6c that is connected to the upper ends of the left and right support columns 3 and allows the seat 2 to move up and down is formed. The seat drum 5 rotatably supports left and right drum shafts 5a projecting outward from both sides to end plates 6a and 6b via a metal 6d. On the shaft end side of the left and right drum shafts 5a, a forward rotation pulley 8a and a reverse rotation pulley 8b, which are constituent members of an opening / closing device 7 according to the present invention described later, are provided, respectively, and the seat drum 5 is rotated forward and backward. I try to drive it.

  As a result, the seat drum 5 that is horizontally supported in the seat case 4 is driven forward and backward by the opening / closing device 7 to move the seat 2 downward (forward movement) and wind up (reverse movement). Open and close. In addition, the opening / closing operation of the seat 2 is performed by controlling the forward / reverse rotation of the opening / closing device 7 based on a manual operation command of the operation switch 9a installed on the control panel 9 and a detection command of the detection unit (elevation start sensor) 9b for detecting a passing body Thus, the operation is smoothly performed in the same manner as a conventional seat shutter including an electric motor that is controlled to rotate forward and backward.

In other words, the opening / closing device 7 of the seat shutter 1 performs forward / reverse rotation driving without using an electric motor, and expansion / contraction operation of a forward rotation cylinder (open cylinder) 11a and a reverse rotation cylinder (closed cylinder) 11b operated by compressed air. The operation control is performed by a pneumatic valve, a pneumatic control device, or the like disposed on the control panel 9. Air for operating pneumatic devices such as the opening / closing device 7, the control panel 9, and the switch valve is supplied from an air supply unit 10 including an arbitrary unit such as a compressor installed outside the seat shutter 1. Thus, the sheet shutter 1 can be an explosion-proof shutter device. In this case, when the detection unit 9b is used as an electrical start sensor means such as infrared rays or ultrasonic waves, the detection unit 9b uses an explosion-proof type. It is desirable to arrange the power supply device outside the explosion-proof area.

  Next, the internal structure of the seat 2 and the seat case 4 will be described with reference to FIGS. First, the illustrated sheet 2 is a rectangular curtain body made of synthetic resin having translucency, flexibility, wear resistance, and the like, and its upper end (base side) is along the circumferential surface of the sheet drum 5 along the axial direction. Mounted. The sheet 2 is provided with a plurality of frame-like guide projections 2a having a known structure along both side edges of the curtain body with a predetermined interval, and a shutter configured on the inward facing surface side of each column 3. A guide projection 2a is accommodated in the guide portion 12 so as to be slidable up and down. As a result, the seat 2 is held in a tension state in the lateral direction while being engaged and guided on both sides of the seat, and performs a smooth raising and lowering operation.

  Further, a straight grounding portion 2b is provided at the lower end of the seat 2 so as to be grounded while maintaining airtightness on the ground or the floor surface (hereinafter referred to as the floor surface) in the closed state where the seat 2 is lowered. The grounding portion 2b also serves as a weight portion with a weight incorporated therein, and the seat 2 is extended downward by the weight. When the seat shutter 1 is of an explosion-proof type, the use of the explosion-proof and non-combustible sheet 2 can prevent static charge associated with winding and unwinding during opening and closing operations.

  As shown in FIG. 6, the shutter guide portion 12 has a groove 13 formed along the column direction on the inward surface side of the column 3 having a hollow C-shaped section, and an outer rail having a U-shaped section in the groove 13. 14 is configured. The outer rail 14 is attached and fixed by fitting grooves formed along the column direction on both outer sides of the open end to the groove 13 of the column 3. And the inner rail 16 is detachably fitted and attached in a rail groove 14b formed between the front and rear side walls 14a, 14a of the U-shaped cross section. The outer rail 14 and the inner rail 16 are formed of a synthetic resin material having wear resistance and a certain degree of flexibility.

  As shown in FIG. 6, the inner rail 16 is accommodated by engaging the guide protrusions 2a of the seat 2 so as to be slidable up and down on the left and right sides of the intermediate wall 19 provided in the rail member in the horizontal direction in the horizontal section. The inward engagement guide 21 and the inner locking portion 22 (main body portion) for elastically attaching to the outer rail 14 in the seat tension direction are integrally formed. The engagement guide 21 is formed by a guide wall 23 having a pair of hook-shaped tips projecting inward from both front and rear sides of the intermediate wall 19. The guide walls 23, 23 have a sheet groove 23 a communicating with the guide groove for accommodating the guide protrusion 2 a inside between the hook portions at the tip.

As a result, the engagement guide 21 of the inner rail 16 accommodates the guide protrusion 2a via the seat groove 23a, supports the seat 2 in the tension direction, restricts the shaking in the front-rear direction, and guides its up-and-down movement. Further, in a state where the guide protrusion 2a of the seat 2 is accommodated in the guide groove of the engagement guide 21, it is slid up and down while preventing it from coming out inward.
In other words, even when the seat 2 receives wind pressure when it is raised and lowered and the guide projection 2a opens the seat groove 23a and tries to escape from the guide groove, the guide projection 2a is restricted from being pulled out by the hook shape of the front and rear guide walls 23. Smooth up and down guidance.

The inner locking portion 22 forms a hollow portion by the intermediate wall 19 and side walls 24 and 24 projecting in parallel outward from both sides thereof. Further, the side walls 24, 24 are provided with hook portions 24a bent inward at the outer ends thereof, so that pin grooves 24b into which the mounting pins 26 are slidable up and down are formed in the rail direction.
With this structure, the inner locking portion 22 has a hollow portion, an outward mounting pin 26 having a flange-shaped head portion 26a at the inner end, and a coil-shaped spring 28 sheathed outside the mounting pin 26. A spacer 26b, which is inserted between the spring 28 and the mounting pin 26 and restricts the compression limit of the spring 28, and a band plate-shaped spring seat 29 for receiving the outer end of the spring 28 are accommodated. Further, the mounting pin 26 has such a length that the end portion of the pin protrudes from the pin groove 24b and the mounting hole 14d in a state where the head portion is pressed against the intermediate wall 19 by the elasticity of the spring 28.

Thus, the mounting pin 26 is protruded by inserting a portion protruding from the pin groove 24b into a mounting hole 14d formed in the bottom wall 14c of the outer rail 14, and the protruding portion has a band plate shape in the vertical direction. The receiving seat 26c is attached, and a stopper 26d made of a stopper pin or the like is detachably provided at the end of the pin, and the attachment pin 26 is supported and assembled while being pulled inwardly.
As described above, the mounting pins 26 with the springs 28 are inserted into the mounting holes 14d formed in the rail direction through the outer rail 14 with a predetermined mounting interval, and the inner locking portions 22 are also connected to the mounting holes. Supported in 14d.

  As a result, the inner rail 16 is mounted in the outer rail 14 by the mounting pin 26, and the inner rail 16 is pressed against the bottom wall 14c of the outer rail 14 evenly over the entire length by the outward elasticity of each spring 28. As a result, the engagement guide 21 can elastically support the sheet 2 in the outward sheet tension direction via the guide protrusion 2a. It is desirable that the mounting pin 26 has a length that makes its head portion contact the intermediate wall 19 of the inner rail 16.

  As shown in FIG. 6, the seat guide configured as described above is configured such that when the seat 2 receives a strong force in the front-rear direction perpendicular to the seat surface due to strong wind or the like, the inner rail 16 moves the seat 2 and the guide protrusion 2 a. It receives a tensile force in the inward direction. At this time, since the inner rail 16 slides inward in the outer rail 14 against the spring 28, the tensile force caused by wind can be buffered.

  Next, the opening / closing device 7 that rotates the seat drum 5 forward and backward will be described with reference to FIGS. The opening / closing device 7 includes a forward rotation cylinder 11a and a reverse rotation cylinder 11b that are allocated to the left and right support columns 3, a forward rotation pulley 8a and a reverse rotation pulley 8b that are provided on the drum shaft 5a of the seat drum 5. From forward and reverse connecting members 31, 32, etc., which are wound around the pulley 8 a for rotation and the pulley 8 b for reverse rotation so as to be rewound out and connected to the corresponding forward rotation cylinder 11 a and reverse rotation cylinder 11 b. Become. The connecting members 31 and 32 of the embodiment are flat belts made of a reinforced fiber fabric having wear resistance. The connecting members 31 and 32 made of a flat belt are advantageous in that the take-up performance is excellent and the pulley take-up diameter can be suppressed. Further, the connecting members 31 and 32 can be made of ropes such as plastics, steel, or wire rope, if necessary.

  In the embodiment, the opening / closing device 7 can use the forward rotation cylinder 11a and the reverse rotation cylinder 11b with the same specifications as the general-purpose single-action air cylinder. As a result, the cylinder parts and the apparatus cost are reduced, and the highly reliable opening / closing operation of the seat 2 is performed. The forward rotation cylinder 11a and the reverse rotation cylinder 11b are detachably attached to the side surfaces of the lower columns of the columns with the piston rods 34 facing upward in a state of being distributed to the left and right columns 3. Each piston rod 34 has the same expansion / contraction operation stroke defined by the upper and lower ends of each cylinder portion 33.

  When air is supplied to the upper portion of the cylinder portion 33 by the air control circuit shown in FIG. 8, the piston rod 34 is contracted to the stroke end (lower limit position). The piston rod 34 can be extended to the stroke end (upper limit position) by the belt pulling force when the supply of air is stopped. Each cylinder part 33 is provided with an intake / exhaust hole with a filter or silencer that freely sucks and exhausts outside air at the lower part of the cylinder chamber. In addition, the piston rods 34 are driven by a pulling force of the forward rotation belt 31 and the reverse rotation belt 32 to discharge the air in the upper part of the cylinder chamber by a predetermined amount and perform a follow-up operation while taking in air from the intake and exhaust holes.

In addition, the forward and reverse connecting members (hereinafter simply referred to as belts) 31 and 32 are adjustable in length on the rod heads of the piston rods 34 that are housed in the cylinders 33 and extend and contract in the vertical direction. A mounting portion 36 for mounting is provided.
Further, between the forward rotation pulley 8a, the reverse rotation pulley 8b, and the upper ends of the left and right support columns 3, a forward rotation guide pulley 37a and a reverse rotation guide pulley 37b are rotatably supported on the end plates 6a and 6b. ing.

  In the closed state shown by the solid line in FIG. 1 in which the seat 2 is lowered and the grounding portion 2b is in contact with the floor surface by the above configuration, the forward belt 31 is attached to the forward pulley 8a as shown in FIG. The belt is wound so as to form the maximum winding diameter in the counterclockwise direction, and the middle of the belt is passed from the upper side of the forward rotation guide pulley 37a to the support column 3 at the rear lower side, and the lower end of the belt is attached to the piston rod 34 at the upper limit of extension. 36. As a result, the piston rod 34 of the forward rotation cylinder 11a pulls the forward rotation belt 31 forward when the air is contracted and forwardly rotates the forward rotation pulley 8a, and simultaneously rotates the seat drum 5 forward to wind up the seat 2. Let

  On the other hand, in the closed state, the reverse rotation belt 32 is wound around the reverse rotation pulley 8b so that the upper end side is opposite to the normal rotation belt 31 and forms the minimum winding diameter, as shown in FIG. The lower end of the belt is connected to the head of the piston rod 34 at the lower limit position of the reversing cylinder 11b through the attachment portion 36 through the support 3 below the rear portion from the upper side of 37b. As a result, when the forward rotation cylinder 11a is contracted and the seat drum 5 is forwardly rotated and the sheet 2 is wound up, the forward rotating pulley 34 simultaneously rotates the reverse belt 32 while forming the maximum winding diameter. The piston rod 34 of the cylinder 11b is extended to the extension upper limit position.

  The piston rod 34 of the reversing cylinder 11b is closed by pulling the reversing belt 32 and reversing the reversing pulley 8b at the time of contraction supplied with air, and simultaneously reversing the seat drum 5 to feed and lower the seat 2. Put it in a state. At this time, the forward rotation pulley 8a that reverses simultaneously rotates the piston rod 34 of the forward rotation cylinder 11a to the upper limit position by the operation of winding the forward rotation belt 31 so as to form the maximum winding diameter. Return to the ascending standby state. Further, as described above, each open / close device 7 disposed along the left and right support columns 3 is covered with a cover 41 having a U-shaped side view in cross section, and the cover 41 is detachable from the outer wall of the support column 3. By attaching, it is easy to perform maintenance work such as belt length adjustment and belt replacement.

  The seat shutter 1 including the opening / closing device 7 includes an air control circuit which will be described later with reference to FIG. 8, and when the seat 2 is closed, the detection unit 9 b or the operation switch 9 a raises the command via the control valve of the control panel 9, The compressed air is supplied from the air supply unit 10 to the forward rotation cylinder 11a, and the reverse rotation cylinder 11b is controlled to be in a free state. As a result, as described above, the seat drum 5 that pulls out the forward rotation belt 31 based on the downward movement (contraction movement) of the piston rod 34 of the forward rotation cylinder 11a and rotates forward via the forward rotation pulley 8a causes the seat 2 to move forward. The coil is raised to the uppermost position indicated by the dotted line H in FIG. At this time, the reverse rotation belt 32 is wound around the reverse rotation pulley 8b rotating via the seat drum 5 so as to maximize the winding diameter, and the piston rod 34 of the reverse rotation cylinder 11b in the free state is moved to the forward rotation cylinder 11a. The piston rod 34 is moved upward (extended) in the opposite direction.

  As a result, when the piston rod 34 of the forward rotation cylinder 11a is in the lower limit position, the opening / closing device 7 causes the seat drum 5 to fully wind the seat 2 and fully opens at the highest position H shown in FIG. Stop. At the same time, the piston rod 34 of the reverse rotation cylinder 11b, which is in the free state, is driven in the extending direction without hindering the forward rotation of the seat drum 5 when the seat 2 is raised, and the reverse rotation belt 32 is driven by the driven resistance at this time. The tension state is maintained without bending. Accordingly, since the reverse rotation pulley 8b winds the reverse rotation belt 32 by forming a predetermined amount of winding diameter without loosening, when the reverse rotation cylinder 11b moves down (contracts) to the next position, the reverse rotation of the reverse rotation pulley 8b is reversed. The seat 2 can be smoothly closed without delaying the operation.

  On the other hand, when the seat 2 is fully opened (lowering standby state), the control panel 9 supplies air to the reverse rotation cylinder 11b by the lowering command and controls the forward rotation cylinder 11a to be in a free state. As a result, the reverse rotation cylinder 11b moves the piston rod 34 downward and pulls the reverse rotation belt 32 to feed it out, reverses the seat drum 5 via the reverse rotation pulley 8b and forcibly feeds the seat 2 down. At this time, the forward rotation pulley 8a that rotates backward via the seat drum 5 maximizes the winding diameter of the forward belt 31 while moving the piston rod 34 of the forward rotation cylinder 11a against the driven resistance and following the direction of extension. Wind up as you do.

Further, the forward rotation belt 31 wound when the seat 2 descends is wound tightly on the forward rotation pulley 8a by the driven resistance of the piston rod 34, so that the forward rotation cylinder 11a moves downward. When doing so, the opening operation of the seat 2 is made smooth without delaying the forward rotation of the forward rotation pulley 8a.
Then, when the piston rod 34 reaches the lower limit position and stops, the reverse rotation cylinder 11b stops the lowering of the seat 2 so that the grounding portion 2b is grounded to the floor as shown by a solid line in FIG. .

  Further, as shown in the illustrated example, the sheet 2 wound around the sheet drum 5 descends with a descending acceleration when descending when the weight of the grounding portion 2b is large and the descending resistance is small. The forward rotation cylinder 11a has a lowering speed that is unnecessarily increased. The driven resistance of the forward rotation cylinder 11a can easily adjust the descending speed of the seat 2 by making the exhaust air pressure in the cylinder chamber adjustable.

  In this way, the forward rotation belt 31 and the reverse rotation belt 32 are stretched in different winding directions with respect to the forward rotation pulley 8a and the reverse rotation pulley 8b included in the seat drum 5 so that the single acting type air cylinder is used for the forward rotation. By installing the cylinder 11a and the reversing cylinder 11b so as to be aligned along the column 3, the opening / closing device 7 can be manufactured with a simple and inexpensive configuration. In addition, since the operation followability when the seat 2 is opened and closed can be improved, the operation can be smoothly performed without causing an operation delay of each part.

  Further, the opening / closing device 7 installed so as to be paired with the left and right support columns 3 on both sides of the seat drum 5 is convenient without using a large installation space while using the space around the support columns of each support column 3. It can be easily installed and configured. Further, the opening / closing device 7 configured in a compact manner along the outer surface of the support column 3 covers the outside of the cylinder portion and the belt portion with a cover 41 that is detachably attached to the support column 3. Maintenance work such as pressure setting, belt length adjustment and inspection / repair can be easily performed.

  In the sheet shutter 1 shown in this embodiment, the opening / closing stroke of the sheet 2 is about 2600 mm, and the drum diameter of the sheet drum 5 is about 216 mm. The diameter of the belt winding portion of the forward rotation pulley 8a and the reverse rotation pulley 8b is about 72 mm, and the stroke of each piston rod 34 of the normal rotation cylinder 11a and the reverse rotation cylinder 11b is about 870 mm. As a result, a seat shutter provided with a conventional electric motor is provided to the opening / closing stroke of the seat 2 through the winding means for the forward rotation belt 31 and the reverse rotation belt 32 based on the opposite operations of the piston rods 34 facing each other. The seat 2 can be lifted (opened / closed) at the same opening / closing speed.

  Next, the principal part structure of the switchgear 7 is demonstrated. As shown in FIGS. 3 to 5, the forward rotation pulley 8 a and the reverse rotation pulley 8 b include a winding portion 43 that forms a pulley valley portion having a belt width and a diameter for winding the belt, and both sides of the winding portion 43. And a guide portion 44 that protrudes in a disc shape and guides the left and right sides of the belt. Further, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b are disposed at symmetrical positions facing the upper side of the shafts of the opposed piston rods 34 at the lower rear portions of the forward rotation pulley 8a and the reverse rotation pulley 8b, respectively. Yes.

  As a result, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b support the middle portions of the forward rotation belt 31 and the reverse rotation belt 32 so as to roll freely and guide them to the axial center extension positions of the piston rods 34. Therefore, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b are not affected by changes in the winding diameter of the forward rotation belt 31 and the reverse rotation belt 32 during the opening / closing operation, and the forward rotation cylinder 11a and the reverse rotation cylinder 11b The operation at the time of contraction of each piston 34 can be made smooth. Further, the installation location of the seat drum 5, the forward rotation pulley 8a, and the reverse rotation pulley 8b can be freely selected.

  As shown in FIGS. 6 and 7, the attachment portion 36 includes an attachment base 47 and an attachment member 48 that are detachably attached to the head of the piston rod 34 by fastening nuts 46. The mounting member 48 is formed with a belt insertion hole 48a in the horizontal direction. Thus, the forward rotation belt 31 and the reverse rotation belt 32 are wound around the forward rotation pulley 8a and the reverse rotation pulley 8b, respectively, in the closed state of the seat 2, and the other ends thereof are belt insertion holes 48a of the mounting member 48. And the winding length is adjusted by adjusting the winding length of the mounting pin 47a of the mounting base 47, and the folded end portion is again inserted into the belt insertion hole 48a for positioning. Next, by attaching a fixing member (not shown) for fixing the belt to the attaching member 48, the attaching positions of the belts 31 and 32 are fixed.

  Further, a guide member 49 is provided at the head of each piston rod 34 to guide the vertical operation of the piston rod 34 using the mounting structure of the mounting portion 36. The guide member 49 is a plastic plate having a square shape in plan view, and a central portion thereof is inserted into the piston rod 34 and fastened by a nut 46 together with a mounting base 47 and attached. As a result, the guide member 49 fixed to the piston rod 34 is slidably provided on the outer surface of the support column 3 and the inner surface of the cover 41 so that the movement of the piston rod 34 in the vertical direction over the entire stroke can be smoothly performed. To do.

  That is, when the piston rod 34 is switched to rotate the seat drum 5 forward / reversely, a lateral load in the front / rear and left / right directions is applied to the head that expands / contracts due to the belt swing of the forward rotation belt 31 and the reverse rotation belt 32. With respect to this lateral load, the guide member 49 is in sliding contact with the wall surface in the load direction to restrict the lateral movement of the piston rod 34 and the expansion and contraction operation becomes smooth. Therefore, the forward rotation cylinder 11a and the reverse rotation cylinder 11b can be operated smoothly and smoothly, and the piston expansion / contraction speed can be easily increased.

  Next, an air control circuit having a control panel 9 and the like provided in the opening / closing device 7 will be described with reference to FIG. This air control circuit supplies the control panel 9 from the air supply unit 10 via the air tank 56. Further, the control panel 9 connects the forward rotation and reverse rotation valve units to the forward rotation cylinder 11a and the reverse rotation cylinder 11b so as to open and close. The control panel 9 is connected to an operation switch 9a for manually operating the opening / closing operation of the seat 2 and an explosion-proof detection unit 9b for automatically detecting the passing body and automatically issuing the opening / closing operation command.

  Even if the air supply from the air supply unit 10 is stopped by the setting of the predetermined tank capacity and the pressure accumulation valve, the air tank 56 is similar to the conventional air supplied from the air supply unit 10, The opening / closing operation of the seat 2 can be performed several times (in the embodiment, three times). In addition, as shown in FIGS. 1 and 2, the air tank 56 is provided close to the axial direction of the seat drum 5 so as to be substantially parallel to each other, thereby utilizing a space around the drum in which the seat drum 5 is installed.

  That is, the seat shutter 1 in the illustrated example is provided with a mounting frame 57 that divides a front lower corner space formed between the seat drum 4 and the seat drum 5 in the front and rear, and an air tank on the front surface of the mounting frame 57. 56 is detachably mounted via left and right mounting brackets. The lower portion of the air tank 56 is covered with a tank cover 58 that is detachably attached to the seat case 4 between the left and right support columns 3.

  Thereby, it is a simple structure, suppressing the enlargement of the sheet shutter 1 provided with the air tank 56. FIG. Further, maintenance work such as replacement of the air tank 56 having different air storage amount and adjustment of the storage pressure is performed by opening the tank cover 58 from the front side of the seat shutter 1. As shown by a dotted line in FIG. 2, the air tank 56 can be provided in an arbitrary space in the seat case 4 with a predetermined size, and when provided outside the seat case 4, the seat case It is desirable to provide along the upper part of 4.

  In the air control circuit according to the embodiment, the operating air pressure for contracting the piston rod 34 of the forward rotation cylinder 11a is set higher than the operating air pressure for contracting the piston rod 34 of the reverse rotation cylinder 11b. As a result, the forward rotation cylinder 11a to which high pressure air is supplied pulls the forward rotation belt 31 while contracting with a strong force, smoothly lifts the seat 2 in the closed state against its own weight, and enters the open state. The maintained state of the sheet 2 is stably maintained by the continuous supply of air.

  Further, the reverse rotation cylinder 11b pulls the reverse rotation belt 32 while being contracted by the supply of low-pressure air, and smoothly feeds and lowers the initial feeding of the sheet 2 in the fully opened state against the rotational initial resistance of the seat drum 5. The sheet 2 descending at this time reverses the sheet drum 5 while the contracting power of the reversing cylinder 11b is applied to the sheet weight. The forward rotation belt 31 moves the forward rotation cylinder 11a in the extending direction while being wound around the forward rotation pulley 8a.

  That is, the descending seat 2 is subjected to a descending (closing motion) operation in a state where a sudden lowering due to the weight of the seat is restricted by the addition of an extension drag (driven resistance) on the forward rotation cylinder 11a side, and is closed. To. Further, by continuing the air supply to the reverse rotation cylinder 11b even after the seat 2 is closed, the seat 2 is kept in a closed state, and easy generation of wrinkles and bending of the seat 2 is suppressed. The air control circuit can freely adjust and set the operating air pressure of the forward rotation cylinder 11a and the reverse rotation cylinder 11b from the control panel 9 side. Accordingly, the opening and closing speeds of the seat 2 can be easily adjusted in accordance with various sites and uses of the seat shutter 1.

  Further, the air control circuit supplies air to the forward rotation cylinder 11a based on the change in the air pressure in the forward rotation cylinder 11a when the seat 2 is in the closed state and receives an external force R to stop. A reverse opening control circuit 9c for reversely opening the sheet 2 is provided. As a result, the seat 2 that is in the process of being lowered at the time of closing is subjected to an external force (closing load) R that interferes with closing (lowering) due to contact with an object such as a vehicle (passing body) from below or from the side. When the seat 2 is lowered and stopped in the half-open state h in the middle of closing in FIG. 1, for example, the seat 2 is reversely opened toward the fully-open state H. Can be prevented.

  That is, when the lowering of the seat 2 is prevented by the external force R, the seat drum 5 that continues to reverse through the reverse rotation pulley 8b by the contraction of the reverse rotation cylinder 11b while the reversal is started is in the seat case 4. In order to feed out the sheet 2, the winding is loosened. The reverse rotation cylinder 11b continues to contract and extends the piston rod 34 of the forward rotation cylinder 11a via the forward rotation pulley 8a and the forward rotation belt 31. For this reason, the air pressure in the forward rotation cylinder 11a changes and becomes lower than the air pressure during normal closing. Next, the reverse opening control circuit 9c detects the change in the air pressure in the forward rotation cylinder 11a, cuts off the air supply to the reverse rotation cylinder 11b side and supplies the air to the forward rotation cylinder 11a side.

  As a result, the forward rotation cylinder 11a stops the extension of the piston rod 34 and immediately contracts to cause the seat drum 5 to rotate forward. Then, the sheet 2 in which the winding is loosened in the winding portion in the sheet case 4 starts to move up (reverse opening) while the normally rotating sheet drum 5 tightens the winding looseness. Then, it is separated from the contact object and becomes fully open H and stops. Next, after the factor of the external force R such as the passing body is removed, the seat 2 is smoothly extended again by the normal contraction operation of the reverse rotation cylinder 11b, and the normal closing operation is smoothly performed.

  Further, as described above, the reverse opening control performed when the seat 2 with the external force R is abnormally closed (down) utilizes the change in air pressure when the forward rotation cylinder 11a is normally closed and when the external force R is abnormally closed. Therefore, it can be reliably controlled by a simple and inexpensive structure in which a valve for switching pressure detection is provided in the air circuit. Further, since the reverse rotation cylinder 11b and the forward rotation cylinder 11a are connected to the seat drum 5 via the reverse rotation pulley 8b and the reverse rotation belt 32 and the normal rotation pulley 8a and the normal rotation belt 31, a sudden load caused by the external force R is generated. It has shock-absorbing properties against fluctuations and shocks during reverse opening, and does not cause unreasonable rotations of the seat drum 5 and the opening / closing operation of the seat 2.

  That is, the reverse rotation belt 32 and the normal rotation belt 31 have flexibility and buffering properties during winding and unwinding against load fluctuations caused by the generation of the external force R during the lowering operation of the seat 2 and impact at the time of reverse opening. Relax. Therefore, damage to the seat 2 and deformation of the piston rod 34 can be prevented, and protection of the air control device and the like can be achieved. The air-operated seat shutter 1 including the opening / closing device 7 configured as described above is configured to supply air alternately to the forward rotation cylinder 11a and the reverse rotation cylinder 11b to rotate the seat drum 5 forward and backward. Compared to the air shutter device, the lowering of the seat 2 at the time of initial closing can be quickly performed by the reverse rotation cylinder 11b without causing a delay in closing. Further, the opening and closing speed of the seat 2 can be freely set by adjusting the air supply into each cylinder portion 33, and can be adapted to a pneumatic shutter device for various purposes.

  In the closed state of the seat 2 shown in FIG. 1, the seat shutter 1 including the opening / closing device 7 configured as described above is detected by opening detection when the detecting unit 9b detects a passing body or by opening operation of the operation switch 9a. The air supply unit 10 supplies air to the forward rotation cylinder 11a through the air tank 56 and the control panel 9. As a result, the piston rod 34 of the forward rotation cylinder 11a is contracted by a high air pressure, and the forward rotation pulley 8a and the seat drum 5 are rotated forward while pulling out the forward rotation belt 31 to resist the weight of the seat 2. Take up the winding.

  At this time, the reverse rotation belt 32 wound by the forward rotation reverse rotation pulley 34 extends the piston rod 34 of the reverse rotation cylinder 11b while discharging the air in the upper part of the cylinder against the driven resistance. Further, the reverse rotation pulley 8b can be wound up while winding the reverse rotation belt 32 in a tension state by the driven resistance. Then, the forward rotation cylinder 11a is in the lowered standby posture while keeping the seat 2 in the fully open state at the lower limit position of the extended piston rod 34.

  Next, air is supplied from the air supply unit 10 to the reverse rotation cylinder 11b through the air tank 56 and the control panel 9 when the detection unit 9b detects the absence due to the passage of the passing body or by the closing operation of the operation switch 9a. . As a result, the piston rod 34 of the reversing cylinder 11b is contracted by the low air pressure, and the reversing pulley 8b and the seat drum 5 are reversed while the reversing belt 32 is pulled and fed, and the seat 2 is fed and lowered.

  The forward rotation belt 31 wound around the forward rotation pulley 8a when the seat 2 is lowered is tensioned to the forward rotation pulley 8a by the driven resistance of the piston rod 34 that moves against the lowering force accompanied by the weight of the seat 2. The sheet 2 is wound up without loosening, and the opening operation of the seat 2 performed next is made quick. The reversing cylinder 11b is placed in the ascending standby posture while keeping the seat 2 fully closed at the lower limit position of the contracted piston rod 34.

  As described above, the opening / closing device 7 alternately supplies air to the forward rotation cylinder 11a and the reverse rotation cylinder 11b to expand and contract, and reverses the normal rotation cylinder 11a and the reverse rotation cylinder 11b on the opposite air non-supply side. The seat drum 5 is rotated forward and backward via the forward rotation belt 31 and the forward rotation pulley 8a and the reverse rotation belt 32 and the reverse rotation pulley 8b, and the seat 2 is opened and closed by the simultaneous driven operation of extending and contracting in the direction. Can do. Therefore, the air-driven opening / closing device 7 can improve the operation followability at the time of opening / closing by using two air cylinders, and can provide a shutter device having a simple and inexpensive structure.

  Further, the seat shutter 1 having the reverse opening control circuit 9c is used for normal rotation in a state where the seat 2 is stopped on the spot when the seat 2 in the middle of closing receives an external force R due to contact with a passing body such as a car. Based on the change in the air pressure of the cylinder 11a, air is supplied to the forward rotation cylinder 11a to automatically reverse and open the seat 2 toward the fully open state H. Accordingly, it is possible to prevent the occurrence of troubles associated with the damage and contact of the seat 2 and the passing body, and the subsequent opening / closing operation of the seat 2 can be continued smoothly. Further, it is possible to increase the speed of the opening / closing device 7 that rotates the seat drum 5 forward and backward using the forward rotation cylinder 11a and the reverse rotation cylinder 11b.

  The air-operated seat shutter 1 configured as described above is installed in an explosion-proof area because it does not generate electric sparks and can reliably perform operation control using an air cylinder. In addition, layout changes and relocations can be easily performed. Furthermore, since the seat shutter 1 can be easily installed by simply piping the air supply from the air supply unit 10 outside the explosion-proof area, for example, a power supply facility for operating the electric motor and electrical work Can be omitted.

The opening / closing device 7 of the seat shutter 1 according to the embodiment is configured such that the forward rotation cylinder 11a and the reverse rotation cylinder 11b are provided separately on the left and right support columns 3 installed on the left and right sides of the seat drum 5. The present invention can also be configured as follows without limitation.
That is, the cylinders 11a and 11b are arranged side by side on one side of the seat drum 5 without separating the forward rotation cylinder 11a and the reverse rotation cylinder 11b to the left and right, and the forward rotation pulley 8a and the reverse rotation pulley 8a are arranged on one side of the seat drum 5. The pulleys 8b may be provided collectively, and the two corresponding to each other may be connected by the normal rotation belt 31 and the reverse rotation belt 32.

  In this case, forward / reverse rotation of the seat drum 5 installed vertically in one of the front ends along a single shutter guide portion 12 installed sideways without providing the left and right support columns 3 in the upper part of the front entrance. Thus, the opening / closing device 7 of the lateral opening / closing type shutter that can open and close the seat 2 in the left-right direction can be simply configured. The shutter device provided with the opening / closing device 7 of the lateral opening / closing type shutter is the same as that used in a conventional lateral opening / closing type shutter device in place of the film-like sheet 2 in the illustrated example. A type or bellows type shutter member can be used. In this case, it is desirable that the storage and feeding device 5 be a structure that can store and feed out the shutter member suitably instead of the cylindrical sheet drum 5.

  The forward rotation cylinder 11a and the reverse rotation cylinder 11b are configured to perform shutter operation control using a single-acting cylinder in the embodiment, but a double-acting cylinder may be used. In this case, the air supply control is performed as desired, and the piston rod 34 can be freely expanded and contracted, so that the operation control such as the shutter opening / closing speed and timing can be made more free.

1 Sheet shutter (shutter device)
2 Sheet (Shutter)
3 Prop 4 Seat case (equipment frame)
5 Seat drum (storage and feeding device)
8a Forward pulley 8b Reverse pulley 10 Air supply part 11a Forward cylinder 11a
11b Cylinder for reverse rotation 12 Shutter guide portion 31 Forward rotation belt 32 Reverse rotation belt 34 Piston rod 37a Guide pulley for forward rotation 37b Guide pulley for reverse rotation 41 Cover 49 Guide member 56 Air tank

  The present invention relates to an air-type shutter device that can be installed at an entrance / exit of a building such as a factory or a warehouse.

In general, a sheet shutter (shutter device) installed at a doorway or partition part of a building such as a factory or a warehouse is a sheet shutter on which a sheet (shutter) is wound so that the sheet can be wound and fed out by a forward and reverse rotation by an electric motor. A method of moving up and down along the guide rails on both sides is widely known. A shutter device equipped with such an electric motor type opening / closing device is likely to cause a short circuit or a spark due to discharge when the shutter is operated. For example, a chemical factory or underground passage with various explosive gas generation, various construction sites, etc. Then, it cannot be used as it is.
On the other hand, as a shutter device that can be used in a place with the generation of explosive gas, the seat drum 5 is driven forward and reverse by an air-driven air motor to raise and lower the shutter without using an electric motor, An air-type opening / closing device that opens and closes an entrance / exit is already known (see, for example, Patent Document 1).
In addition, as an air-driven shutter device, a shutter that moves up and down along the guide rails on both sides via a wire rope by vertically extending and retracting a piston of an air cylinder installed along the guide rail. The device is already known (see, for example, Patent Document 2).

JP 58-69974 A Japanese Utility Model Publication No. 62-36177

The air-type switchgear disclosed in Patent Document 1 can be used as an explosion-proof shutter device because it does not use electricity, but it uses a high-priced air motor and controls forward and reverse rotation of the air motor. In addition, since control parts such as an air clutch device and a number of switching valves are required, the circuit device is complicated and expensive.
On the other hand, the air-type opening / closing device disclosed in Patent Document 2 uses a single air cylinder and a balance weight that operates and urges the shutter in the downward direction on the head of the piston, and two wires that support the left and right sides of the shutter. An inexpensive shutter that does not require an electric motor is being constructed by means such as providing a plurality of moving pulleys that pull and operate the rope in the vertical direction.

  However, since this air type opening and closing device raises the shutter by pulling two wire ropes wound around a plurality of pulleys, a large and expensive air cylinder is required, and the plurality of pulleys are used for tensioning. The long wire rope that is easily bent is accompanied by problems such as a delay in operation at the time of opening and closing and a decrease in operation followability such as a stop operation.

  A shutter device including an air-type opening / closing device using a single large air cylinder, a wire rope, and a balance weight is used to reversely open (up) in the middle of closing (lowering) the shutter. In particular, there is a problem that the inertia of the balance weight at the time of bending and operation of the wire rope hinders the smoothness of the reversing and opening operation and makes it difficult to increase the speed of raising and lowering the shutter.

In order to solve the above-mentioned problems, the present invention is firstly provided with a seat case 4 that pivotally supports a sheet drum 5 that winds and feeds the sheet 2 so as to be rotatable forward and backward, and on the side of the seat case 4 In the seat shutter 1 that includes a shutter guide portion 12 that reciprocates and guides the seat 2 and that opens and closes the seat 2 using air as a power source, the air guide rotates in a reverse direction along the shutter guide portion 12. the use cylinder 11b, with the respective piston rod (34) extendable operating freely provided to the sheet drum 5, a sheet drum 5, the connecting member for reversing the connecting member 31 for normal rotation attached to each piston rod 34 32 and is cooperative with the sheet Todoramu 5 by stretching operation of the piston rod 34 is normally and reversely rotated, characterized in that to perform the winding feeding the sheet 2 It is.

Secondly , a forward rotation pulley 8a and a reverse rotation pulley 8b, which are wound around the side of the seat drum 5 so that the forward rotation belt 31 and the reverse rotation belt 32, which are connecting members attached to the piston rods 34, can be unwound and unwound. The forward rotation belt 31 wound around the forward rotation pulley 8a is pulled out by the contraction of the piston rod 34 of the forward rotation cylinder 11a, so that the seat drum 5 is rotated forward to wind up and open the seat 2. While the reverse rotation belt 32 is wound around the reverse rotation pulley 8b, the reverse rotation belt 32 wound around the reverse rotation pulley 8b is pulled and pulled out by the contraction of the piston rod 34 of the reverse rotation cylinder 11b. , The forward rotation belt 31 is wound around the forward rotation pulley 8a while the seat 2 is fed out and closed, and the seat drum 5 is rotated forward and backward. It is characterized in that to perform the second winding unwinding.

Third , the forward rotation cylinder 11a and the reverse rotation cylinder 11b are provided along the left and right support columns 3 having the shutter guide portions 12 installed on the left and right of the seat drum 5, and A forward rotation pulley 8a and a reverse rotation pulley 8b are provided to wind up and rotate the forward rotation belt 31 on the rotation cylinder 11a side and the reverse rotation belt 32 on the reverse rotation cylinder 11b side, and the forward rotation cylinder 11a and the reverse rotation cylinder 11b are provided. By alternately supplying air to the sheet drum 5, the sheet drum 5 is rotated forward and backward so that the sheet 2 is taken up and fed out.

Fourth, regular rotation pulley 8a and the reverse rotation pulley 8b and the and the second turn forward belt 31 to be attached and reverse belt 32, forward rotation guide pulley 37a which is rotatably supported in the vicinity of the normal rotation pulley 8a and the reverse rotation pulley 8b And a reverse guide pulley 37b, respectively, are guided in the axial direction of the piston rods 34 of the forward rotation cylinder 11a and the reverse rotation cylinder 11b, respectively.

Fifth , the forward rotation cylinder 11a, the forward rotation belt 31, the reverse rotation cylinder 11b, and the reverse rotation belt 32 are covered with a cover 41, and the above-mentioned cover is attached to the head of each piston rod 34 of the forward rotation cylinder 11a and the reverse rotation cylinder 11b. A guide member 49 that is slidably moved along the guide 41 is provided.

Sixth , when the seat 2 is in the middle of closing and receives an external force R and stops abnormally, the seat 2 is supplied with air to the forward rotation cylinder 11a based on the change in air pressure in the forward rotation cylinder 11a. Is characterized by reversing and opening.

Seventh , an air tank 56 that stores an amount of air that can open and close the seat 2 a plurality of times is connected to the forward rotation cylinder 11 a and the reverse rotation cylinder 11 b, and the air tank 56 is connected to the seat drum 5. It is characterized by being installed along the axial direction.

More pneumatic shutter device of the present invention configured in this way, according to the first aspect of the invention, by the piston rod of the forward rotation cylinder, sheet drum is rotated forward by the winding opening motion of the sheet, the piston rod of the opposite diverting cylinder Accordingly, by reversing the sheet drum can be feed closing the sheet.

According to the second aspect of the present invention, the forward rotation belt wound around the forward rotation pulley is pulled out by the contraction of the piston rod of the forward rotation cylinder, so that the seat drum is rotated forward and the sheet is wound and opened. The reverse rotation belt can be wound around the reverse rotation pulley. On the other hand, the reverse rotation belt wound around the reverse rotation pulley is pulled out by the contraction of the piston rod of the reverse rotation cylinder, thereby reversing the seat drum and feeding and closing the seat, while rotating the forward rotation belt to the forward rotation pulley. As a result, the direction of each piston of the forward rotation cylinder and the reverse rotation cylinder can be set so as to be aligned with the direction of the seat drum along the shutter guide portion, and the same telescopic operation stroke can be provided. Thus, the forward and reverse rotation of the sheet drum can be performed, and the sheet winding and unwinding can be performed using the forward rotation cylinder and the reverse rotation cylinder having substantially the same specifications.
Therefore, the followability of the operation at the time of opening and closing the seat can be improved by the two air cylinders without using the electric motor, so that the opening and closing operation of the seat can be performed efficiently and reliably. In addition, the air-type shutter device can be manufactured with a simple and inexpensive structure.

According to invention of Claim 3 , an air-type opening / closing apparatus can be comprised compactly in the space around a support | pillar. Further, since the forward rotation pulley and the reverse rotation pulley are provided separately on the left and right sides of the seat drum, maintenance work such as belt length adjustment and inspection / repair can be easily performed.

According to the fourth aspect of the present invention, the forward rotation cylinder and the reverse rotation cylinder are not affected by changes in the winding position of the forward rotation belt and the reverse rotation belt with respect to the installation position of the seat drum and the forward rotation pulley and the reverse rotation pulley. The operation at the time of contraction of each piston can be made smooth.

According to the fifth aspect of the present invention, the guide member slides on the wall surface in the load direction against the lateral load applied to the head of the piston rod that is expanded and contracted due to the belt swing of the forward rotation belt and the reverse rotation belt, and the piston rod Since the lateral movement is restricted, the expansion and contraction operations of the forward rotation cylinder and the reverse rotation cylinder can be made smooth, and the piston stroke can be lengthened and the expansion and contraction speed can be easily increased.

According to the invention of claim 6 , when the seat at the time of closing is subjected to external force due to contact with a passing body such as a car, the seat is reversely opened from the closing stop position. Moreover, it is possible to prevent occurrence of troubles associated with contact. Further, the reverse opening operation is performed by utilizing the change in the air pressure between the normal closing operation and the abnormal closing operation of the forward rotation cylinder, so that the reverse opening control can be made simple and inexpensive.

According to the invention of claim 7 , even when air supply is not performed from the air supply unit side, the opening and closing operation of the seat can be performed an appropriate number of times. By installing the air tank along the axial direction of the seat drum, it is possible to install the air tank without increasing the size of the shutter device by utilizing the space around the seat drum, and also to change the air tank and adjust the storage pressure. It is possible to facilitate maintenance work such as.

FIG. 3 is a front view illustrating a sheet shutter to which the present invention is applied, with a part thereof broken. FIG. 2 is a left side sectional view showing a configuration of a main part of FIG. 1. FIG. 3 is a front view illustrating a configuration of a forward rotation pulley, a forward rotation pulley, and a normal rotation belt with a part thereof broken. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a front view which shows the structure of the attaching part of a normal rotation belt and the cylinder for normal rotation. It is an air control circuit diagram of a switchgear.

  An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a sheet shutter mainly shown as an example of a shutter device installed at the entrance of a building, and supports a sheet (shutter) 2 as a member for the shutter and its left and right, and guides up and down movement in the vertical direction. It is comprised by the support | pillar 3 (side frame) which is a square hollow C-shaped cross section comprised as a guide member to perform, the cylindrical sheet | seat case (seat frame) 4 etc. which accommodate the sheet | seat 2 so that winding and unwinding are possible. The column 3 is attached and fixed along a pillar or wall formed at the entrance of the building, and the seat case 4 is installed sideways along the beam or wall of the building.

  The seat case 4 of the illustrated seat shutter 1 is detachably attached via attachment members in a state where both sides thereof are placed on the left and right columns 3. In the seat case 4, a seat drum (storage and feeding device) 5 that rotates forward and backward so that the sheet 2 can be wound and unwound is supported and supported. As a result, the seat 2 is supported by the shutter guide portions formed on the left and right support columns 3 so that both sides can be moved up and down, and as the seat drum 5 rotates forward and backward, the seat 2 is moved up and down (opening and closing operation). Open and close.

  Next, the configuration of each part of the sheet shutter 1 will be described with reference to FIGS. The seat case 4 forms a hollow case chamber by detachably attaching end plates 6 a and 6 b to both sides of a cylindrical case body 6 having a square cross section in a side view, and is formed in a lower rear portion of the case body 6. The opening 6c that is connected to the upper ends of the left and right support columns 3 and allows the seat 2 to move up and down is formed. The seat drum 5 rotatably supports left and right drum shafts 5a projecting outward from both sides to end plates 6a and 6b via a metal 6d. On the shaft end side of the left and right drum shafts 5a, a forward rotation pulley 8a and a reverse rotation pulley 8b, which are constituent members of an opening / closing device 7 according to the present invention described later, are provided, respectively, and the seat drum 5 is rotated forward and backward. I try to drive it.

  As a result, the seat drum 5 that is horizontally supported in the seat case 4 is driven forward and backward by the opening / closing device 7 to move the seat 2 downward (forward movement) and wind up (reverse movement). Open and close. In addition, the opening / closing operation of the seat 2 is performed by controlling the forward / reverse rotation of the opening / closing device 7 based on a manual operation command of the operation switch 9a installed on the control panel 9 and a detection command of the detection unit (elevation start sensor) 9b for detecting a passing body. Thus, the operation is smoothly performed in the same manner as a conventional seat shutter including an electric motor that is controlled to rotate forward and backward.

In other words, the opening / closing device 7 of the seat shutter 1 performs forward / reverse rotation driving without using an electric motor, and expansion / contraction operation of a forward rotation cylinder (open cylinder) 11a and a reverse rotation cylinder (closed cylinder) 11b operated by compressed air. The operation control is performed by a pneumatic valve, a pneumatic control device, or the like disposed on the control panel 9. Air for operating pneumatic devices such as the opening / closing device 7, the control panel 9, and the switch valve is supplied from an air supply unit 10 including an arbitrary unit such as a compressor installed outside the seat shutter 1. Thus, the sheet shutter 1 can be an explosion-proof shutter device. In this case, when the detection unit 9b is used as an electrical start sensor means such as infrared rays or ultrasonic waves, the detection unit 9b uses an explosion-proof type. It is desirable to arrange the power supply device outside the explosion-proof area.

  Next, the internal structure of the seat 2 and the seat case 4 will be described with reference to FIGS. First, the illustrated sheet 2 is a rectangular curtain body made of synthetic resin having translucency, flexibility, wear resistance, and the like, and its upper end (base side) is along the circumferential surface of the sheet drum 5 along the axial direction. Mounted. The sheet 2 is provided with a plurality of frame-like guide projections 2a having a known structure along both side edges of the curtain body with a predetermined interval, and a shutter configured on the inward facing surface side of each column 3. A guide projection 2a is accommodated in the guide portion 12 so as to be slidable up and down. As a result, the seat 2 is held in a tension state in the lateral direction while being engaged and guided on both sides of the seat, and performs a smooth raising and lowering operation.

  Further, a straight grounding portion 2b is provided at the lower end of the seat 2 so as to be grounded while maintaining airtightness on the ground or the floor surface (hereinafter referred to as the floor surface) in the closed state where the seat 2 is lowered. The grounding portion 2b also serves as a weight portion with a weight incorporated therein, and the seat 2 is extended downward by the weight. When the seat shutter 1 is of an explosion-proof type, the use of the explosion-proof and non-combustible sheet 2 can prevent static charge associated with winding and unwinding during opening and closing operations.

  As shown in FIG. 6, the shutter guide portion 12 has a groove 13 formed along the column direction on the inward surface side of the column 3 having a hollow C-shaped section, and an outer rail having a U-shaped section in the groove 13. 14 is configured. The outer rail 14 is attached and fixed by fitting grooves formed along the column direction on both outer sides of the open end to the groove 13 of the column 3. And the inner rail 16 is detachably fitted and attached in a rail groove 14b formed between the front and rear side walls 14a, 14a of the U-shaped cross section. The outer rail 14 and the inner rail 16 are formed of a synthetic resin material having wear resistance and a certain degree of flexibility.

  As shown in FIG. 6, the inner rail 16 is accommodated by engaging the guide protrusions 2a of the seat 2 so as to be slidable up and down on the left and right sides of the intermediate wall 19 provided in the rail member in the horizontal direction in the horizontal section. The inward engagement guide 21 and the inner locking portion 22 (main body portion) for elastically attaching to the outer rail 14 in the seat tension direction are integrally formed. The engagement guide 21 is formed by a guide wall 23 having a pair of hook-shaped tips projecting inward from both front and rear sides of the intermediate wall 19. The guide walls 23, 23 have a sheet groove 23 a communicating with the guide groove for accommodating the guide protrusion 2 a inside between the hook portions at the tip.

As a result, the engagement guide 21 of the inner rail 16 accommodates the guide protrusion 2a via the seat groove 23a, supports the seat 2 in the tension direction, restricts the shaking in the front-rear direction, and guides its up-and-down movement. Further, in a state where the guide protrusion 2a of the seat 2 is accommodated in the guide groove of the engagement guide 21, it is slid up and down while preventing it from coming out inward.
In other words, even when the seat 2 receives wind pressure when it is raised and lowered and the guide projection 2a opens the seat groove 23a and tries to escape from the guide groove, the guide projection 2a is restricted from being pulled out by the hook shape of the front and rear guide walls 23. Smooth up and down guidance.

The inner locking portion 22 forms a hollow portion by the intermediate wall 19 and side walls 24 and 24 projecting in parallel outward from both sides thereof. Further, the side walls 24, 24 are provided with hook portions 24a bent inward at the outer ends thereof, so that pin grooves 24b into which the mounting pins 26 are slidable up and down are formed in the rail direction.
With this structure, the inner locking portion 22 has a hollow portion, an outward mounting pin 26 having a flange-shaped head portion 26a at the inner end, and a coil-shaped spring 28 sheathed outside the mounting pin 26. A spacer 26b, which is inserted between the spring 28 and the mounting pin 26 and restricts the compression limit of the spring 28, and a band plate-shaped spring seat 29 for receiving the outer end of the spring 28 are accommodated. Further, the mounting pin 26 has such a length that the end portion of the pin protrudes from the pin groove 24b and the mounting hole 14d in a state where the head portion is pressed against the intermediate wall 19 by the elasticity of the spring 28.

Thus, the mounting pin 26 is protruded by inserting a portion protruding from the pin groove 24b into a mounting hole 14d formed in the bottom wall 14c of the outer rail 14, and the protruding portion has a band plate shape in the vertical direction. The receiving seat 26c is attached, and a stopper 26d made of a stopper pin or the like is detachably provided at the end of the pin, and the attachment pin 26 is supported and assembled while being pulled inwardly.
As described above, the mounting pins 26 with the springs 28 are inserted into the mounting holes 14d formed in the rail direction through the outer rail 14 with a predetermined mounting interval, and the inner locking portions 22 are also connected to the mounting holes. Supported in 14d.

  As a result, the inner rail 16 is mounted in the outer rail 14 by the mounting pin 26, and the inner rail 16 is pressed against the bottom wall 14c of the outer rail 14 evenly over the entire length by the outward elasticity of each spring 28. As a result, the engagement guide 21 can elastically support the sheet 2 in the outward sheet tension direction via the guide protrusion 2a. It is desirable that the mounting pin 26 has a length that makes its head portion contact the intermediate wall 19 of the inner rail 16.

  As shown in FIG. 6, the seat guide configured as described above is configured such that when the seat 2 receives a strong force in the front-rear direction perpendicular to the seat surface due to strong wind or the like, the inner rail 16 moves the seat 2 and the guide protrusion 2 a. It receives a tensile force in the inward direction. At this time, since the inner rail 16 slides inward in the outer rail 14 against the spring 28, the tensile force caused by wind can be buffered.

  Next, the opening / closing device 7 that rotates the seat drum 5 forward and backward will be described with reference to FIGS. The opening / closing device 7 includes a forward rotation cylinder 11a and a reverse rotation cylinder 11b that are allocated to the left and right support columns 3, a forward rotation pulley 8a and a reverse rotation pulley 8b that are provided on the drum shaft 5a of the seat drum 5. From forward and reverse connecting members 31, 32, etc., which are wound around the pulley 8 a for rotation and the pulley 8 b for reverse rotation so as to be rewound out and connected to the corresponding forward rotation cylinder 11 a and reverse rotation cylinder 11 b. Become. The connecting members 31 and 32 of the embodiment are flat belts made of a reinforced fiber fabric having wear resistance. The connecting members 31 and 32 made of a flat belt are advantageous in that the take-up performance is excellent and the pulley take-up diameter can be suppressed. Further, the connecting members 31 and 32 can be made of ropes such as plastics, steel, or wire rope, if necessary.

  In the embodiment, the opening / closing device 7 can use the forward rotation cylinder 11a and the reverse rotation cylinder 11b with the same specifications as the general-purpose single-action air cylinder. As a result, the cylinder parts and the apparatus cost are reduced, and the highly reliable opening / closing operation of the seat 2 is performed. The forward rotation cylinder 11a and the reverse rotation cylinder 11b are detachably attached to the side surfaces of the lower columns of the columns with the piston rods 34 facing upward in a state of being distributed to the left and right columns 3. Each piston rod 34 has the same expansion / contraction operation stroke defined by the upper and lower ends of each cylinder portion 33.

  When air is supplied to the upper portion of the cylinder portion 33 by the air control circuit shown in FIG. 8, the piston rod 34 is contracted to the stroke end (lower limit position). The piston rod 34 can be extended to the stroke end (upper limit position) by the belt pulling force when the supply of air is stopped. Each cylinder part 33 is provided with an intake / exhaust hole with a filter or silencer that freely sucks and exhausts outside air at the lower part of the cylinder chamber. In addition, the piston rods 34 are driven by a pulling force of the forward rotation belt 31 and the reverse rotation belt 32 to discharge the air in the upper part of the cylinder chamber by a predetermined amount and perform a follow-up operation while taking in air from the intake and exhaust holes.

In addition, the forward and reverse connecting members (hereinafter simply referred to as belts) 31 and 32 are adjustable in length on the rod heads of the piston rods 34 that are housed in the cylinders 33 and extend and contract in the vertical direction. A mounting portion 36 for mounting is provided.
Further, between the forward rotation pulley 8a, the reverse rotation pulley 8b, and the upper ends of the left and right support columns 3, a forward rotation guide pulley 37a and a reverse rotation guide pulley 37b are rotatably supported on the end plates 6a and 6b. ing.

  In the closed state shown by the solid line in FIG. 1 in which the seat 2 is lowered and the grounding portion 2b is in contact with the floor surface by the above configuration, the forward belt 31 is attached to the forward pulley 8a as shown in FIG. The belt is wound so as to form the maximum winding diameter in the counterclockwise direction, and the middle of the belt is passed from the upper side of the forward rotation guide pulley 37a to the support column 3 at the rear lower side, and the lower end of the belt is attached to the piston rod 34 at the upper limit of extension. 36. As a result, the piston rod 34 of the forward rotation cylinder 11a pulls the forward rotation belt 31 forward when the air is contracted and forwardly rotates the forward rotation pulley 8a, and simultaneously rotates the seat drum 5 forward to wind up the seat 2. Let

  On the other hand, in the closed state, the reverse rotation belt 32 is wound around the reverse rotation pulley 8b so that the upper end side is opposite to the normal rotation belt 31 and forms the minimum winding diameter, as shown in FIG. The lower end of the belt is connected to the head of the piston rod 34 at the lower limit position of the reversing cylinder 11b through the attachment portion 36 through the support 3 below the rear portion from the upper side of 37b. As a result, when the forward rotation cylinder 11a is contracted and the seat drum 5 is forwardly rotated and the sheet 2 is wound up, the forward rotating pulley 34 simultaneously rotates the reverse belt 32 while forming the maximum winding diameter. The piston rod 34 of the cylinder 11b is extended to the extension upper limit position.

  The piston rod 34 of the reversing cylinder 11b is closed by pulling the reversing belt 32 and reversing the reversing pulley 8b at the time of contraction supplied with air, and simultaneously reversing the seat drum 5 to feed and lower the seat 2. Put it in a state. At this time, the forward rotation pulley 8a that reverses simultaneously rotates the piston rod 34 of the forward rotation cylinder 11a to the upper limit position by the operation of winding the forward rotation belt 31 so as to form the maximum winding diameter. Return to the ascending standby state. Further, as described above, each open / close device 7 disposed along the left and right support columns 3 is covered with a cover 41 having a U-shaped side view in cross section, and the cover 41 is detachable from the outer wall of the support column 3. By attaching, it is easy to perform maintenance work such as belt length adjustment and belt replacement.

  The seat shutter 1 including the opening / closing device 7 includes an air control circuit which will be described later with reference to FIG. 8, and when the seat 2 is closed, the detection unit 9 b or the operation switch 9 a raises the command via the control valve of the control panel 9, The compressed air is supplied from the air supply unit 10 to the forward rotation cylinder 11a, and the reverse rotation cylinder 11b is controlled to be in a free state. As a result, as described above, the seat drum 5 that pulls out the forward rotation belt 31 based on the downward movement (contraction movement) of the piston rod 34 of the forward rotation cylinder 11a and rotates forward via the forward rotation pulley 8a causes the seat 2 to move forward. The coil is raised to the uppermost position indicated by the dotted line H in FIG. At this time, the reverse rotation belt 32 is wound around the reverse rotation pulley 8b rotating via the seat drum 5 so as to maximize the winding diameter, and the piston rod 34 of the reverse rotation cylinder 11b in the free state is moved to the forward rotation cylinder 11a. The piston rod 34 is moved upward (extended) in the opposite direction.

  As a result, when the piston rod 34 of the forward rotation cylinder 11a is in the lower limit position, the opening / closing device 7 causes the seat drum 5 to fully wind the seat 2 and fully opens at the highest position H shown in FIG. Stop. At the same time, the piston rod 34 of the reverse rotation cylinder 11b, which is in the free state, is driven in the extending direction without hindering the forward rotation of the seat drum 5 when the seat 2 is raised, and the reverse rotation belt 32 is driven by the driven resistance at this time. The tension state is maintained without bending. Accordingly, since the reverse rotation pulley 8b winds the reverse rotation belt 32 by forming a predetermined amount of winding diameter without loosening, when the reverse rotation cylinder 11b moves down (contracts) to the next position, the reverse rotation of the reverse rotation pulley 8b is reversed. The seat 2 can be smoothly closed without delaying the operation.

  On the other hand, when the seat 2 is fully opened (lowering standby state), the control panel 9 supplies air to the reverse rotation cylinder 11b by the lowering command and controls the forward rotation cylinder 11a to be in a free state. As a result, the reverse rotation cylinder 11b moves the piston rod 34 downward and pulls the reverse rotation belt 32 to feed it out, reverses the seat drum 5 via the reverse rotation pulley 8b and forcibly feeds the seat 2 down. At this time, the forward rotation pulley 8a that rotates backward via the seat drum 5 maximizes the winding diameter of the forward belt 31 while moving the piston rod 34 of the forward rotation cylinder 11a against the driven resistance and following the direction of extension. Wind up as you do.

Further, the forward rotation belt 31 wound when the seat 2 descends is wound tightly on the forward rotation pulley 8a by the driven resistance of the piston rod 34, so that the forward rotation cylinder 11a moves downward. When doing so, the opening operation of the seat 2 is made smooth without delaying the forward rotation of the forward rotation pulley 8a.
Then, when the piston rod 34 reaches the lower limit position and stops, the reverse rotation cylinder 11b stops the lowering of the seat 2 so that the grounding portion 2b is grounded to the floor as shown by a solid line in FIG. .

  Further, as shown in the illustrated example, the sheet 2 wound around the sheet drum 5 descends with a descending acceleration when descending when the weight of the grounding portion 2b is large and the descending resistance is small. The forward rotation cylinder 11a has a lowering speed that is unnecessarily increased. The driven resistance of the forward rotation cylinder 11a can easily adjust the descending speed of the seat 2 by making the exhaust air pressure in the cylinder chamber adjustable.

  In this way, the forward rotation belt 31 and the reverse rotation belt 32 are stretched in different winding directions with respect to the forward rotation pulley 8a and the reverse rotation pulley 8b included in the seat drum 5 so that the single acting type air cylinder is used for the forward rotation. By installing the cylinder 11a and the reversing cylinder 11b so as to be aligned along the column 3, the opening / closing device 7 can be manufactured with a simple and inexpensive configuration. In addition, since the operation followability when the seat 2 is opened and closed can be improved, the operation can be smoothly performed without causing an operation delay of each part.

  Further, the opening / closing device 7 installed so as to be paired with the left and right support columns 3 on both sides of the seat drum 5 is convenient without using a large installation space while using the space around the support columns of each support column 3. It can be easily installed and configured. Further, the opening / closing device 7 configured in a compact manner along the outer surface of the support column 3 covers the outside of the cylinder portion and the belt portion with a cover 41 that is detachably attached to the support column 3. Maintenance work such as pressure setting, belt length adjustment and inspection / repair can be easily performed.

  In the sheet shutter 1 shown in this embodiment, the opening / closing stroke of the sheet 2 is about 2600 mm, and the drum diameter of the sheet drum 5 is about 216 mm. The diameter of the belt winding portion of the forward rotation pulley 8a and the reverse rotation pulley 8b is about 72 mm, and the stroke of each piston rod 34 of the normal rotation cylinder 11a and the reverse rotation cylinder 11b is about 870 mm. As a result, a seat shutter provided with a conventional electric motor is provided to the opening / closing stroke of the seat 2 through the winding means for the forward rotation belt 31 and the reverse rotation belt 32 based on the opposite operations of the piston rods 34 facing each other. The seat 2 can be lifted (opened / closed) at the same opening / closing speed.

  Next, the principal part structure of the switchgear 7 is demonstrated. As shown in FIGS. 3 to 5, the forward rotation pulley 8 a and the reverse rotation pulley 8 b include a winding portion 43 that forms a pulley valley portion having a belt width and a diameter for winding the belt, and both sides of the winding portion 43. And a guide portion 44 that protrudes in a disc shape and guides the left and right sides of the belt. Further, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b are disposed at symmetrical positions facing the upper side of the shafts of the opposed piston rods 34 at the lower rear portions of the forward rotation pulley 8a and the reverse rotation pulley 8b, respectively. Yes.

  As a result, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b support the middle portions of the forward rotation belt 31 and the reverse rotation belt 32 so as to roll freely and guide them to the axial center extension positions of the piston rods 34. Therefore, the forward rotation guide pulley 37a and the reverse rotation guide pulley 37b are not affected by changes in the winding diameter of the forward rotation belt 31 and the reverse rotation belt 32 during the opening / closing operation, and the forward rotation cylinder 11a and the reverse rotation cylinder 11b The operation at the time of contraction of each piston 34 can be made smooth. Further, the installation location of the seat drum 5, the forward rotation pulley 8a, and the reverse rotation pulley 8b can be freely selected.

  As shown in FIGS. 6 and 7, the attachment portion 36 includes an attachment base 47 and an attachment member 48 that are detachably attached to the head of the piston rod 34 by fastening nuts 46. The mounting member 48 is formed with a belt insertion hole 48a in the horizontal direction. Thus, the forward rotation belt 31 and the reverse rotation belt 32 are wound around the forward rotation pulley 8a and the reverse rotation pulley 8b, respectively, in the closed state of the seat 2, and the other ends thereof are belt insertion holes 48a of the mounting member 48. And the winding length is adjusted by adjusting the winding length of the mounting pin 47a of the mounting base 47, and the folded end portion is again inserted into the belt insertion hole 48a for positioning. Next, by attaching a fixing member (not shown) for fixing the belt to the attaching member 48, the attaching positions of the belts 31 and 32 are fixed.

  Further, a guide member 49 is provided at the head of each piston rod 34 to guide the vertical operation of the piston rod 34 using the mounting structure of the mounting portion 36. The guide member 49 is a plastic plate having a square shape in plan view, and a central portion thereof is inserted into the piston rod 34 and fastened by a nut 46 together with a mounting base 47 and attached. As a result, the guide member 49 fixed to the piston rod 34 is slidably provided on the outer surface of the support column 3 and the inner surface of the cover 41 so that the movement of the piston rod 34 in the vertical direction over the entire stroke can be smoothly performed. To do.

  That is, when the piston rod 34 is switched to rotate the seat drum 5 forward / reversely, a lateral load in the front / rear and left / right directions is applied to the head that expands / contracts due to the belt swing of the forward rotation belt 31 and the reverse rotation belt 32. With respect to this lateral load, the guide member 49 is in sliding contact with the wall surface in the load direction to restrict the lateral movement of the piston rod 34 and the expansion and contraction operation becomes smooth. Therefore, the forward rotation cylinder 11a and the reverse rotation cylinder 11b can be operated smoothly and smoothly, and the piston expansion / contraction speed can be easily increased.

  Next, an air control circuit having a control panel 9 and the like provided in the opening / closing device 7 will be described with reference to FIG. This air control circuit supplies the control panel 9 from the air supply unit 10 via the air tank 56. Further, the control panel 9 connects the forward rotation and reverse rotation valve units to the forward rotation cylinder 11a and the reverse rotation cylinder 11b so as to open and close. The control panel 9 is connected to an operation switch 9a for manually operating the opening / closing operation of the seat 2 and an explosion-proof detection unit 9b for automatically detecting the passing body and automatically issuing the opening / closing operation command.

  Even if the air supply from the air supply unit 10 is stopped by the setting of the predetermined tank capacity and the pressure accumulation valve, the air tank 56 is similar to the conventional air supplied from the air supply unit 10, The opening / closing operation of the seat 2 can be performed several times (in the embodiment, three times). In addition, as shown in FIGS. 1 and 2, the air tank 56 is provided close to the axial direction of the seat drum 5 so as to be substantially parallel to each other, thereby utilizing a space around the drum in which the seat drum 5 is installed.

  That is, the seat shutter 1 in the illustrated example is provided with a mounting frame 57 that divides a front lower corner space formed between the seat drum 4 and the seat drum 5 in the front and rear, and an air tank on the front surface of the mounting frame 57. 56 is detachably mounted via left and right mounting brackets. The lower portion of the air tank 56 is covered with a tank cover 58 that is detachably attached to the seat case 4 between the left and right support columns 3.

  Thereby, it is a simple structure, suppressing the enlargement of the sheet shutter 1 provided with the air tank 56. FIG. Further, maintenance work such as replacement of the air tank 56 having different air storage amount and adjustment of the storage pressure is performed by opening the tank cover 58 from the front side of the seat shutter 1. As shown by a dotted line in FIG. 2, the air tank 56 can be provided in an arbitrary space in the seat case 4 with a predetermined size, and when provided outside the seat case 4, the seat case It is desirable to provide along the upper part of 4.

  In the air control circuit according to the embodiment, the operating air pressure for contracting the piston rod 34 of the forward rotation cylinder 11a is set higher than the operating air pressure for contracting the piston rod 34 of the reverse rotation cylinder 11b. As a result, the forward rotation cylinder 11a to which high pressure air is supplied pulls the forward rotation belt 31 while contracting with a strong force, smoothly lifts the seat 2 in the closed state against its own weight, and enters the open state. The maintained state of the sheet 2 is stably maintained by the continuous supply of air.

  Further, the reverse rotation cylinder 11b pulls the reverse rotation belt 32 while being contracted by the supply of low-pressure air, and smoothly feeds and lowers the initial feeding of the sheet 2 in the fully opened state against the rotational initial resistance of the seat drum 5. The sheet 2 descending at this time reverses the sheet drum 5 while the contracting power of the reversing cylinder 11b is applied to the sheet weight. The forward rotation belt 31 moves the forward rotation cylinder 11a in the extending direction while being wound around the forward rotation pulley 8a.

  That is, the descending seat 2 is subjected to a descending (closing motion) operation in a state where a sudden lowering due to the weight of the seat is restricted by the addition of an extension drag (driven resistance) on the forward rotation cylinder 11a side, and is closed. To. Further, by continuing the air supply to the reverse rotation cylinder 11b even after the seat 2 is closed, the seat 2 is kept in a closed state, and easy generation of wrinkles and bending of the seat 2 is suppressed. The air control circuit can freely adjust and set the operating air pressure of the forward rotation cylinder 11a and the reverse rotation cylinder 11b from the control panel 9 side. Accordingly, the opening and closing speeds of the seat 2 can be easily adjusted in accordance with various sites and uses of the seat shutter 1.

  Further, the air control circuit supplies air to the forward rotation cylinder 11a based on the change in the air pressure in the forward rotation cylinder 11a when the seat 2 is in the closed state and receives an external force R to stop. A reverse opening control circuit 9c for reversely opening the sheet 2 is provided. As a result, the seat 2 that is in the process of being lowered at the time of closing is subjected to an external force (closing load) R that interferes with closing (lowering) due to contact with an object such as a vehicle (passing body) from below or from the side. When the seat 2 is lowered and stopped in the half-open state h in the middle of closing in FIG. 1, for example, the seat 2 is reversely opened toward the fully-open state H. Can be prevented.

  That is, when the lowering of the seat 2 is prevented by the external force R, the seat drum 5 that continues to reverse through the reverse rotation pulley 8b by the contraction of the reverse rotation cylinder 11b while the reversal is started is in the seat case 4. In order to feed out the sheet 2, the winding is loosened. The reverse rotation cylinder 11b continues to contract and extends the piston rod 34 of the forward rotation cylinder 11a via the forward rotation pulley 8a and the forward rotation belt 31. For this reason, the air pressure in the forward rotation cylinder 11a changes and becomes lower than the air pressure during normal closing. Next, the reverse opening control circuit 9c detects the change in the air pressure in the forward rotation cylinder 11a, cuts off the air supply to the reverse rotation cylinder 11b side and supplies the air to the forward rotation cylinder 11a side.

  As a result, the forward rotation cylinder 11a stops the extension of the piston rod 34 and immediately contracts to cause the seat drum 5 to rotate forward. Then, the sheet 2 in which the winding is loosened in the winding portion in the sheet case 4 starts to move up (reverse opening) while the normally rotating sheet drum 5 tightens the winding looseness. Then, it is separated from the contact object and becomes fully open H and stops. Next, after the factor of the external force R such as the passing body is removed, the seat 2 is smoothly extended again by the normal contraction operation of the reverse rotation cylinder 11b, and the normal closing operation is smoothly performed.

  Further, as described above, the reverse opening control performed when the seat 2 with the external force R is abnormally closed (down) utilizes the change in air pressure when the forward rotation cylinder 11a is normally closed and when the external force R is abnormally closed. Therefore, it can be reliably controlled by a simple and inexpensive structure in which a valve for switching pressure detection is provided in the air circuit. Further, since the reverse rotation cylinder 11b and the forward rotation cylinder 11a are connected to the seat drum 5 via the reverse rotation pulley 8b and the reverse rotation belt 32 and the normal rotation pulley 8a and the normal rotation belt 31, a sudden load caused by the external force R is generated. It has shock-absorbing properties against fluctuations and shocks during reverse opening, and does not cause unreasonable rotations of the seat drum 5 and the opening / closing operation of the seat 2.

  That is, the reverse rotation belt 32 and the normal rotation belt 31 have flexibility and buffering properties during winding and unwinding against load fluctuations caused by the generation of the external force R during the lowering operation of the seat 2 and impact at the time of reverse opening. Relax. Therefore, damage to the seat 2 and deformation of the piston rod 34 can be prevented, and protection of the air control device and the like can be achieved. The air-operated seat shutter 1 including the opening / closing device 7 configured as described above is configured to supply air alternately to the forward rotation cylinder 11a and the reverse rotation cylinder 11b to rotate the seat drum 5 forward and backward. Compared to the air shutter device, the lowering of the seat 2 at the time of initial closing can be quickly performed by the reverse rotation cylinder 11b without causing a delay in closing. Further, the opening and closing speed of the seat 2 can be freely set by adjusting the air supply into each cylinder portion 33, and can be adapted to a pneumatic shutter device for various purposes.

  In the closed state of the seat 2 shown in FIG. 1, the seat shutter 1 including the opening / closing device 7 configured as described above is detected by opening detection when the detecting unit 9b detects a passing body or by opening operation of the operation switch 9a. The air supply unit 10 supplies air to the forward rotation cylinder 11a through the air tank 56 and the control panel 9. As a result, the piston rod 34 of the forward rotation cylinder 11a is contracted by a high air pressure, and the forward rotation pulley 8a and the seat drum 5 are rotated forward while pulling out the forward rotation belt 31 to resist the weight of the seat 2. Take up the winding.

  At this time, the reverse rotation belt 32 wound by the forward rotation reverse rotation pulley 34 extends the piston rod 34 of the reverse rotation cylinder 11b while discharging the air in the upper part of the cylinder against the driven resistance. Further, the reverse rotation pulley 8b can be wound up while winding the reverse rotation belt 32 in a tension state by the driven resistance. Then, the forward rotation cylinder 11a is in the lowered standby posture while keeping the seat 2 in the fully open state at the lower limit position of the extended piston rod 34.

  Next, air is supplied from the air supply unit 10 to the reverse rotation cylinder 11b through the air tank 56 and the control panel 9 when the detection unit 9b detects the absence due to the passage of the passing body or by the closing operation of the operation switch 9a. . As a result, the piston rod 34 of the reversing cylinder 11b is contracted by the low air pressure, and the reversing pulley 8b and the seat drum 5 are reversed while the reversing belt 32 is pulled and fed, and the seat 2 is fed and lowered.

  The forward rotation belt 31 wound around the forward rotation pulley 8a when the seat 2 is lowered is tensioned to the forward rotation pulley 8a by the driven resistance of the piston rod 34 that moves against the lowering force accompanied by the weight of the seat 2. The sheet 2 is wound up without loosening, and the opening operation of the seat 2 performed next is made quick. The reversing cylinder 11b is placed in the ascending standby posture while keeping the seat 2 fully closed at the lower limit position of the contracted piston rod 34.

  As described above, the opening / closing device 7 alternately supplies air to the forward rotation cylinder 11a and the reverse rotation cylinder 11b to expand and contract, and reverses the normal rotation cylinder 11a and the reverse rotation cylinder 11b on the opposite air non-supply side. The seat drum 5 is rotated forward and backward via the forward rotation belt 31 and the forward rotation pulley 8a and the reverse rotation belt 32 and the reverse rotation pulley 8b, and the seat 2 is opened and closed by the simultaneous driven operation of extending and contracting in the direction. Can do. Therefore, the air-driven opening / closing device 7 can improve the operation followability at the time of opening / closing by using two air cylinders, and can provide a shutter device having a simple and inexpensive structure.

  Further, the seat shutter 1 having the reverse opening control circuit 9c is used for normal rotation in a state where the seat 2 is stopped on the spot when the seat 2 in the middle of closing receives an external force R due to contact with a passing body such as a car. Based on the change in the air pressure of the cylinder 11a, air is supplied to the forward rotation cylinder 11a to automatically reverse and open the seat 2 toward the fully open state H. Accordingly, it is possible to prevent the occurrence of troubles associated with the damage and contact of the seat 2 and the passing body, and the subsequent opening / closing operation of the seat 2 can be continued smoothly. Further, it is possible to increase the speed of the opening / closing device 7 that rotates the seat drum 5 forward and backward using the forward rotation cylinder 11a and the reverse rotation cylinder 11b.

  The air-operated seat shutter 1 configured as described above is installed in an explosion-proof area because it does not generate electric sparks and can reliably perform operation control using an air cylinder. In addition, layout changes and relocations can be easily performed. Furthermore, since the seat shutter 1 can be easily installed by simply piping the air supply from the air supply unit 10 outside the explosion-proof area, for example, a power supply facility for operating the electric motor and electrical work Can be omitted.

The opening / closing device 7 of the seat shutter 1 according to the embodiment is configured such that the forward rotation cylinder 11a and the reverse rotation cylinder 11b are provided separately on the left and right support columns 3 installed on the left and right sides of the seat drum 5. The present invention can also be configured as follows without limitation.
That is, the cylinders 11a and 11b are arranged side by side on one side of the seat drum 5 without separating the forward rotation cylinder 11a and the reverse rotation cylinder 11b to the left and right, and the forward rotation pulley 8a and the reverse rotation pulley 8a are arranged on one side of the seat drum 5. The pulleys 8b may be provided collectively, and the two corresponding to each other may be connected by the normal rotation belt 31 and the reverse rotation belt 32.

  In this case, forward / reverse rotation of the seat drum 5 installed vertically in one of the front ends along a single shutter guide portion 12 installed sideways without providing the left and right support columns 3 in the upper part of the front entrance. Thus, the opening / closing device 7 of the lateral opening / closing type shutter that can open and close the seat 2 in the left-right direction can be simply configured. The shutter device provided with the opening / closing device 7 of the lateral opening / closing type shutter is the same as that used in a conventional lateral opening / closing type shutter device in place of the film-like sheet 2 in the illustrated example. A type or bellows type shutter member can be used. In this case, it is desirable that the storage and feeding device 5 be a structure that can store and feed out the shutter member suitably instead of the cylindrical sheet drum 5.

  The forward rotation cylinder 11a and the reverse rotation cylinder 11b are configured to perform shutter operation control using a single-acting cylinder in the embodiment, but a double-acting cylinder may be used. In this case, the air supply control is performed as desired, and the piston rod 34 can be freely expanded and contracted, so that the operation control such as the shutter opening / closing speed and timing can be made more free.

1 Sheet shutter (shutter device)
2 Sheet (Shutter)
3 Prop 4 Seat case (equipment frame)
5 Seat drum (storage and feeding device)
8a Forward pulley 8b Reverse pulley 10 Air supply part 11a Forward cylinder 11a
11b Cylinder for reverse rotation 12 Shutter guide part 31 Connecting member (Forward rotation belt)
32 connecting members ( reverse belt)
34 Piston rod 37a Guide pulley for forward rotation 37b Guide pulley for reverse rotation 41 Cover 49 Guide member 56 Air tank

Claims (6)

  A sheet case (4) that pivotally supports a sheet drum (5) for winding and unwinding the sheet (2) so as to be rotatable forward and backward, and a sheet (2) that is installed on the side of the sheet case (4) to reciprocate. In a seat shutter (1) having a shutter guide portion (12) for guiding and opening and closing the seat (2) using air as a power source, an air-type forward rotation cylinder along the shutter guide portion (12) (11a) and a reversing cylinder (11b) are provided so that each piston rod (34) can be expanded and contracted with respect to the seat drum (5), and at the side of the seat drum (5), each piston rod (34). A forward rotation pulley (8a) and a reverse rotation pulley (8b) for winding and winding the forward rotation belt (31) and the reverse rotation belt (32) attached to the belt are provided, and wound on the forward rotation pulley (8a). The forward rotation belt (31) is pulled out by contraction of the piston rod (34) of the forward rotation cylinder (11a), so that the seat drum (5) is rotated forward to wind up and open the seat (2). While the reverse rotation belt (32) is wound around the reverse rotation pulley (8b), the reverse rotation belt (32) wound around the reverse rotation pulley (8b) is connected to the piston rod (34) of the reverse rotation cylinder (11b). By pulling and feeding by contraction, the forward rotation belt (31) is wound around the forward rotation pulley (8a) while the seat drum (5) is reversely rotated and the sheet (2) is extended and closed, and the seat drum (5 ) Is rotated forward and backward to wind and unwind the sheet (2).   The forward rotation cylinder (11a) and the reverse rotation cylinder (11b) are provided along the left and right support columns (3) having shutter guide portions (12) installed on the left and right sides of the seat drum (5). The forward rotation pulley (8a) for winding the forward rotation belt (31) on the forward rotation cylinder (11a) side and the reverse rotation belt (32) on the reverse rotation cylinder (11b) side to the right and left of (5) so as to be able to wind and unwind freely. And a reverse rotation pulley (8b), and by alternately supplying air to the forward rotation cylinder (11a) and the reverse rotation cylinder (11b), the sheet drum (5) is rotated forward and backward to rotate the sheet (2). The air-type shutter device according to claim 1, wherein the winding and feeding are performed.   The forward rotation belt (31) and the reverse rotation belt (32) wound around the forward rotation pulley (8a) and the reverse rotation pulley (8b) are placed in the vicinity of the forward rotation pulley (8a) and the reverse rotation pulley (8b). The normal rotation guide pulley (37a) and the reverse rotation guide pulley (37b) supported by the shaft are guided in the axial direction of the piston rods (34) of the normal rotation cylinder (11a) and the reverse rotation cylinder (11b), respectively. The pneumatic shutter device according to claim 1 or 2.   The forward rotation cylinder (11a), the forward rotation belt (31), the reverse rotation cylinder (11b) and the reverse rotation belt (32) are covered with a cover (41), and each of the forward rotation cylinder (11a) and the reverse rotation cylinder (11b) is covered. The pneumatic shutter device according to claim 1, 2 or 3, wherein a guide member (49) that is slidably moved along the cover (41) is provided on a head of the piston rod (34).   Air is supplied to the forward rotation cylinder (11a) based on the change in air pressure in the forward rotation cylinder (11a) when the seat (2) is in the middle of closing and receives an external force (R) to stop. Then, the air shutter device according to claim 1, 2, 3, or 4 for reversing and opening the sheet (2).   An air tank (56) for storing an air amount capable of opening and closing the seat (2) a plurality of times is connected to the forward rotation cylinder (11a) and the reverse rotation cylinder (11b). 56) is installed along the axial direction of the seat drum (5). The pneumatic shutter device according to claim 1 or 2, 3 or 4 or 5.

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