JPH0610032B2 - Gate opener - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate opening / closing device that opens and closes a gate with a cylinder, and in particular, even if an operating valve or the like for supplying pressure fluid to the cylinder fails, The present invention relates to a highly safe gate opening / closing device capable of closing a gate.

[Conventional technology]

Figure 2 shows asphalt synthetic silo 1 (hereinafter referred to as silo 1
Call. ) Is shown. The main body of the silo 1 has a cylindrical shape, and the bottom portion thereof has a truncated cone shape. Then, the first gates 3a, 3a and the second gates 3, 3 are vertically arranged side by side at the lower end thereof. As shown enlarged in FIG. 3 and FIG. 4, the second gates 3, 3 are arranged so that they can be opened and closed by the discharge port 2 of the hopper of the composite material below the first gates 3a, 3a. Is provided and the first gate 3
It is possible to discharge the mixed material input from a and 3a to the dump truck 4 and the like below the silo 1 while appropriately weighing.

The second gates 3 and 3 (hereinafter, referred to as gates 3 and 3) are swingable around axes 5 and 5, respectively, and the gates 3 and 3 are further connected to the arms 6 and 6 and the link. It is designed to be interlocked by the plate 7. An air cylinder 8 of a gate opening / closing device is rotatably attached to the side of the gate 3 at a bottom portion, and a tip of a rod 9 thereof is connected to one gate 3.

Although not shown, the bottom-side port and the head-side port of the air cylinder 8 are connected to an air pressure source via operating valves, respectively. Then, by appropriately operating these operation valves, air pressure is applied to the bottom side port as shown in FIG. 3, and air is allowed to escape from the head side port, the rod 9 extends and the gate 3, 3 is open.
Further, as shown in FIG. 4, when air pressure is applied to both ports, the piston stops at the intermediate position and the gates 3, 3 are in a half-opened state, so that the precision of measuring the discharged mixture can be improved. Although not shown, if air is released from the bottom port and air pressure is applied to the head port, the rod 9 retracts and the gates 3 are closed.

[Problems to be Solved by the Invention]

According to the conventional gate opening / closing device, there is a problem that the gate 3 cannot be closed when pneumatic equipment such as an operation valve for operating the air cylinder 8 fails, and in the silo 1 as described above, There was also an accident in which the dump truck 4 was buried because all the mixture in 1 was discharged.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a highly safe gate opening / closing device that can surely close the gate when a device fails.

[Means for Solving the Problems]

A gate opening / closing device of the present invention includes a cylinder that opens and closes a gate by fluid pressure, an opening operation valve that supplies fluid to an opening port of the cylinder to drive the gate in an opening direction, and a fluid that supplies to a closing port of the cylinder. In a gate opening / closing device having a closing operation valve for driving the gate in the closing direction, an emergency closing valve that is operated in an emergency or the like to supply a fluid to the closing port of the cylinder, and the emergency closing valve are operated. A shutoff valve for shutting off the closing operation valve from the closing port of the cylinder by a shutoff valve, and a flow for discharging the fluid at the opening port of the cylinder while shutting off the opening operation valve from the opening port of the cylinder by operating the emergency shutoff valve. And a path switching valve.

[Work]

A cylinder is driven by the open operation valve or the close operation valve to open / close the gate.

When a failure occurs in the cylinder operation system such as the open operation valve or the close operation valve, the emergency stop valve is operated. As a result, the shutoff valve operates to disconnect the closing operation valve from the cylinder, and fluid is supplied from the emergency closing valve to the closed port side of the cylinder. In addition, the operation of the emergency shutoff valve causes the flow path switching valve to operate to disconnect the open operation valve from the cylinder, so that the fluid can be discharged from the open port of the cylinder. That is,
The cylinder is separated from the system of the open / close operation valve, and is forcedly driven in the direction to close the gate by the pressure of the fluid supplied from the emergency shutoff valve.

〔Example〕

 An embodiment of the present invention will be described with reference to FIG.

This air cylinder 10 is the same as that described in the section [Prior Art], and the gate is opened by the pushing motion of the rod 9 extending and the gate is closed by the pulling motion of the rod 9 retracting. is there. That is, in this embodiment, the port on the head 11 side from which the rod 9 of the air cylinder 10 projects is the closed port 12, and the port on the bottom 13 side is the open port 14.

Pressure source 1 supplied with air from a compressor (not shown)
An opening operation valve 18 is connected to 5 via an air regulator 16 and a check valve 17. The opening operation valve 18 is a two-position solenoid valve, and in the illustrated neutral position, the conduit on the side of the check valve 17 is blocked, and when switched, the conduit communicates. The open operation valve 18 is connected to the open port 14 of the air cylinder 10 via a master valve 19 as a flow path switching valve. The master valve 19 is a two-position valve that can be switched by air pressure. In the illustrated neutral position, the opening operation valve 18 and the opening port 14 communicate with each other.
When switched, it blocks the pipeline on the side of the open operation valve 18 and opens the open port 14 to the atmosphere.

Next, a closing operation valve 22 is connected to the pressure source 15 via an air regulator 20 and a check valve 21. The closing operation valve 22 is a two-position solenoid valve, and in the illustrated neutral position, the pipe line on the side of the check valve 21 communicates with the pipe line on the opposite side. The pipeline is blocked.

Reference numeral 23 in the drawing denotes a shuttle valve as a shutoff valve for shutting off the closing operation valve 22 from the air cylinder 10. The shuttle valve 23 is a directional control valve that connects and communicates only one of the two conduits with the closed port 12 of the air cylinder 10 by moving the built-in poppet. One line of the shuttle valve 23 is connected to the closing operation valve 22, and the other line is connected to a manual switching valve 24 which is an emergency closing valve.

The manual switching valve 24 is a two-position valve connected to the pressure source 15, and the pipe line on the pressure source 15 side is blocked at the neutral position in the figure, but the open / close operation valve 1
The pressure source 15 can be connected to the shuttle valve 23 by a manual switching operation when pneumatic equipment such as 8, 22 fails. In addition, a pipe line from the manual switching valve 24 to the shuttle valve 23 is branched on the way and connected to the master valve 19.

Next, the operation in the above configuration will be described.

(1) When the gate is fully closed Both the open operation valve 18 and the close operation valve 22 are turned off,
As shown in the figure, the flow path is at the neutral position. That is, the open operation valve 18 is closed and the close operation valve 22 is open. Therefore, the air cylinder 10 is closed through the closing operation valve 22 and the shuttle valve 23.
Air is supplied to the closed port 12 and the air in the open port 14 is diffused to the atmosphere via the master valve 19 and the opening operation valve 18. Therefore, the air cylinder 10 is driven in the closing direction in which the rod 9 is housed, and the gate is closed.

(2) When the gate is fully opened Both the open operation valve 18 and the close operation valve 22 are turned on to switch the flow paths. That is, the open operation valve 18 is opened and the close operation valve 2 is opened.
2 opens the flow path to the atmosphere. Therefore, air is supplied to the open port 14 of the air cylinder 10 via the opening operation valve 18 and the master valve 19, and the air in the closing port 12 is diffused to the atmosphere via the shuttle valve 23 and the closing operation valve 22.
Therefore, the air cylinder 10 is driven in the opening direction in which the rod 9 extends, and the gate is opened.

(3) When the gate is half open When the closing operation valve 22 is turned off to set the flow path to the neutral position shown in FIG. 1 and the opening operation valve 18 is turned on to switch the flow path,
Both the open operation valve 18 and the close operation valve 22 are opened, and air is supplied to both the open / close ports 14 and 12 of the air cylinder 10. Therefore, the air cylinder 10 is stopped at the neutral position, and the gate is half opened.

(4) Switching in an emergency When the open / close operation valves 18, 22 and the like fail and the closed state of the gate cannot be maintained, or the gate needs to be closed immediately, the manual switching valve 24 To switch. The air from the pressure source 15 enters the shuttle valve 23 via the manual switching valve 24, moves the poppet of the shuttle valve 23, and disconnects the close operation valve 22 and the air cylinder 10. Then, the air is directly supplied from the shuttle valve 23 to the closed port 12 of the air cylinder 10.

Further, the air from the pressure source 15 is given to the master valve 19 via the manual switching valve 24. The flow path of the master valve 19 is switched by this air pressure. Therefore, the connection between the open operation valve 18 and the air cylinder 10 is cut off, and the open port 14 of the air cylinder 10 is opened to the atmosphere via the master valve 19.

As a result, the cylinder 10 is operated in the closing direction, and the gate is securely closed.

Although the one embodiment described above is based on pneumatic pressure, it can be configured to be substantially the same by hydraulic pressure. Also,
The gate opening / closing device of the present invention can be used as a highly safe opening / closing device having an emergency closing function other than the gate of a silo.

〔The invention's effect〕

According to the gate opening / closing device of the present invention, the opening / closing operation valve for operating the cylinder is shut off from the cylinder, and the cylinder is closed by the emergency stop valve of another system. Therefore, according to the present invention, there is an effect that the gate can be immediately closed even when the normally used operating system fails.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a front view of a silo having a gate, FIG. 3 is a view showing a fully opened state of the gate, and FIG. 4 is a half opened state of the gate. It is a figure. 3 ... Gate, 10 ... Air cylinder, 12 ... Closed port, 14 ... Open port, 18 ... Open operation valve, 19 ... Master valve as flow path switching valve, 22 ... Closed operation valve, 23 ...... Shuttle valve as shutoff valve, 24 ...... Manual switching valve as emergency shutoff valve.

Claims (1)

[Claims] 1. A cylinder that opens and closes a gate by fluid pressure, an opening operation valve that supplies fluid to an open port of the cylinder to drive the gate in an opening direction, and a gate that supplies fluid to a closed port of the cylinder. In a gate opening / closing device having a closing operation valve that drives the valve in a closing direction, an emergency closing valve that is operated in an emergency or the like to supply fluid to a closing port of the cylinder, and the closing valve by operating the emergency closing valve. A shutoff valve that shuts off the operating valve from the closed port of the cylinder, and a flow path switching valve that shuts off the open operating valve from the open port of the cylinder by operating the emergency shutoff valve, and discharges fluid from the open port of the cylinder. And a gate opening and closing device.