JPH08295234A - Door closing device - Google Patents

Abstract

PURPOSE: To make it easy to draw out a sandwiched object by energizing a solenoid switching valve for weakening a door closing force, and weakening the door closing force through the weakening of the closing pressure of an air cylinder. CONSTITUTION: A three-port solenoid valve 8 serving as a solenoid switching valve for weakening a door closing force is placed between the air supply port 1b1 of a valve element 1b located on the door closing side of an air pressure cylinder 1 and a four-port solenoid valve 6 serving as a solenoid switching valve communicated with an air pressure source 7. A relief valve 9 is connected to the exhaust side 8a of the three-port solenoid valve 8. Before a train starts, the doors 5a, 5b are closed on command from the conductor, during which the door closing force is weakened by temporary control of the solenoid switching valve for weakening the door closing force, or when a detector detects that some object is sandwiched between the doors, the force to close the doors 5a, 5b is weakened by energizing the detection signal by means of the three-port solenoid valve 8 serving as the solenoid switching valve for weakening the door closing force, and releasing pressure not less than the set pressure of the relief valve 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railcar door closing device for temporarily weakening the door closing force as needed.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing an example of a conventional door closing device for a railway vehicle. In FIG. 7, the door closing device for a railway vehicle includes an air cylinder 1, pulleys 2a and 2b, and a belt 3. And connecting metal fittings 4a, 4b, doors 5a, 5b, a 4-port solenoid valve 6 as an electromagnetic switching valve, and an air pressure source 7,
Open and close the doors 5a, 5b by connecting the metal fittings 4a, 4b attached to them.
It is performed by the belt 3 via b. The belt 3 is stretched around pulleys 2a and 2b and is rotated by the piston rod 1a of the air cylinder 1. The air cylinder 1 is composed of a valve body 1b, a piston 1c, and a buffer valve body 1d, and the valve body 1b and the piston are provided at the beginning of closing the doors 5a and 5b.
1c is engaged, and the piston 1c and the buffer valve 1d are engaged on the verge of closing. In the device configured like this, the door
When 5a and 5b are closed, air is given from the air pressure source 7 to the valve body 1b via the 4-port solenoid valve 6. On the other hand, the air on the right side of the piston passes through the inside of the cylinder, passes through the buffer valve 1d, and is released to the atmosphere through the 4-port solenoid valve 6. This characteristic is shown in FIG. In this case, the door closing force of the doors 5a and 5b is a constant force, usually 50 to 60 kgf. The opening of the doors 5a and 5b is different from the gist of the present invention, and the description thereof will be omitted.

[0003]

The door closing device for a railway vehicle constructed as above has the following problems. As mentioned above, once the door is closed, even if you try to open it by hand, you must open it with a force of 50-60 kgf or more. This means that if a finger, hand, clothes, or belongings are caught between the doors, the person who contacts the conductor or the person who finds the trapped state has the lever of the manual unlocking device installed in the vehicle. It depends on whether you pull it open. However, if the sandwiched state is not scratched by another person, the vehicle will start with the person being dragged, which is extremely dangerous.

The present invention was devised in view of the above-mentioned points, and an object of the present invention is to temporarily weaken the door closing force with the door closed and to easily remove the trapped object. A door closing device for closing is provided.

[0005]

[Means for Solving the Problems] That is, a means for achieving the object is a door closing device for opening and closing a vehicle door using a pneumatic cylinder, and a valve body on the door closing side and a pneumatic pressure in the pneumatic cylinder. The electromagnetic switching valve for weakening the door closing force provided between the electromagnetic switching valve communicating with the power source and the electromagnetic switching valve for communicating with the power source, and the relief valve provided on the exhaust side of the electromagnetic switching valve for weakening the door closing force. By urging the solenoid switching valve for use, the closing pressure of the air cylinder is weakened and the door closing force is weakened. As an application of this, a door closing device for opening and closing a vehicle door using a pneumatic cylinder that temporarily weakens the door closing force by energizing an electromagnetic switching valve for weakening the door closing force. In the pneumatic cylinder, a door closing force weakening electromagnetic switching valve provided between a door closing side valve body and an electromagnetic switching valve communicating with an air pressure source, and exhaust of the door closing force weakening electromagnetic switching valve. A relief valve provided on the side and a controller for controlling the electromagnetic switching valve for weakening the door closing force, which makes it possible to control the extraction time when an object is caught between the doors. Moreover, when an object is caught between the doors, a detector for detecting this state is provided, and the detection signal is transmitted to the electromagnetic switching valve for weakening the door closing force or the controller. Further, a pressure detector may be provided between the valve body on the door closing side of the pneumatic cylinder and the electromagnetic switching valve for weakening the door closing force. Further, the door closing device configured as described above is provided on a railroad vehicle, an automobile, and a platform door.

[0006]

The operation will be described in combination with the embodiment described below. An embodiment of the present invention will be described in detail below with reference to the drawings.

[0007]

1 is a block diagram showing an embodiment of a door closing device for a railway vehicle according to claim 1 of the present invention, in which the same reference numerals as those in FIG. 7 have the same configurations and functions. Is. FIG.
In the above, as an electromagnetic switching valve that communicates with the air supply port 1b1 of the valve body 1b on the door closing side of the pneumatic cylinder 1 and the air pressure source 7,
A 3-port solenoid valve 8 as a solenoid switching valve for weakening the door closing force is provided between the port solenoid valve 6 and a relief valve 9 is connected to an exhaust side 8a of the 3-port solenoid valve 8. It is a thing. In such a device, the doors 5a and 5b are closed by a command from the conductor before the train starts, but at this time, the electromagnetic switching valve for weakening the door closing force is temporarily controlled to weaken the door closing force. For example, a detector (not shown) detects that an object (not shown) is caught between the doors, and the detection signal is used to detect this detection signal as a three-port solenoid valve as a solenoid switching valve for weakening the door closing force. This is because it is biased by 8 to release a pressure above the set pressure of the relief valve 9 to weaken the door closing force of the doors 5a and 5b.

FIG. 2 is a block diagram showing an embodiment of claim 7 of the present invention. In FIG. 2, the valve body 1b of the pneumatic cylinder 1 is shown.
A pressure detector 10 is provided between the door closing side 1b1 and the 3-port solenoid valve 8. This allows, for example, the conductor to be the door.
You can see that it is sandwiched between 5a and 5b. Further, it can be confirmed that the function of weakening the door closing force is operating normally.

Next, the operation will be described with reference to the characteristic diagrams of FIGS. FIG. 3 is a characteristic diagram of a general door closing force and a door opening / closing degree when the vehicle doors 5a and 5b are closed. A constant door closing force f2 is applied up to a position A where the door is completely closed. In this case, there are two cases where the door closing force f2 decreases to f1 at the position A where the door is completely closed. The present invention is an improvement over these two types. FIG. 4 is a characteristic diagram showing an embodiment of the present invention. In the above or at the beginning, a constant door closing force f2 is applied, and at time t1, fingers, hands, clothes or belongings are caught between the doors. If you reduce the pressure.

According to the second aspect of the present invention, after the door closing force is reduced from f2 to f1, the duration of the reduced door closing force f1 is set by, for example, a timer (not shown) as a controller.
That is, since the 3-port solenoid valve 8 is not energized at first, the pressure f2 supplied from the air pressure source 7 remains unchanged as the valve body 1b.
Is supplied to Thereafter, at time t1, if a person is caught or a bag or a person's finger is caught, the 3-port solenoid valve 8 is energized and the door closing force is reduced to f1. afterwards,
When the timer that sets the time until the caught object is taken out acts to deactivate the 3-port solenoid valve 8, the door closing force is restored to the above-mentioned door closing force, and the doors 5a and 5b should be completely closed. Becomes FIG. 5 is a characteristic diagram showing a state in which the door closing force changes while the train is running at a low speed. When the door closing force becomes f1 at time t1, the power of the timer is applied and the train departs at a low speed. In the state, the timer works at time t3, and the maximum door closing force f2 is applied just before the vehicle leaves the platform. Further, when the speed of the vehicle is detected and the speed exceeds a certain speed, the maximum door closing force f2 is applied.

FIG. 6 is a characteristic diagram showing a state in which the door is completely closed before the train departs. When the door closing force becomes f1 at time t1, the power of the timer is applied and before the train departs. Working at time t3, maximum closing force f2 is applied. Claim 3
Indicates that the sensor of the detector provided near the doors 5a and 5b acts, the detection signal is transmitted to the conductor, and it is confirmed that the 3-port solenoid valve 8 is operating reliably. . That is, when the 3-port solenoid valve 8 is energized, the air from the air pressure source 7 is shut off, and the pressure f2 supplied to the air cylinder 1 is connected to the exhaust side 8a of the 3-port solenoid valve 8. The pressure drops to the set pressure value f1 of the relief valve 9 that is present. After that, a time timer (not shown) that allows the sandwiched object to be opened operates, and during this time, the doors 5a and 5b are manually opened to take out the sandwiched object. Then, after a predetermined time has passed, the timer is deactivated, the pressure f1 changes to f2, and the door 5
a and 5b are fully closed.

At this time, since the pressure exerted on the doors 5a and 5b is small, there is a possibility that the doors 5a and 5b can be easily opened to a position where a person can easily enter them. In order to automatically apply f2, for example, a limit switch may be provided at that position so that the total pressure is applied by switching the solenoid valve. According to a fourth aspect of the present invention, the state of pressure applied to the door when an object is caught in the door can be ignored. Claim 5 describes the door closing device of the present invention by taking a railway vehicle as an example, but the present invention is not limited to this, and the same effect can be obtained when it is provided in an automobile and a platform door.

[0013]

As described above, according to the present invention, when a person, a bag, a finger of a person, or the like is caught in the door, the door can be lightly and manually opened, and the caught object can be easily removed. I can do it. Due to this, the door closing device of the present invention,
It is extremely useful in practical use.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a vehicle door closing device of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a degree of opening and closing of a door.

FIG. 4 is a time characteristic diagram when an object is caught in a door.

FIG. 5 is a characteristic diagram when the door is decompressed and the original door closing force is restored before the vehicle departs from the platform.

FIG. 6 is a characteristic diagram when the door decompression is restored to the original door closing force after departure.

FIG. 7 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 Air cylinder 1a Piston rod 1b Valve body 1b1 Air supply port 1c Piston 1d Buffer valve 1d1 Exhaust side 2a Pulley 2b Pulley 3 V belt 4a Connecting metal fitting 4b Connecting metal fitting 5a Door 5b Door 6 4 port Solenoid valve 7 Air pressure source 8 3 port Solenoid valve 8a Exhaust side 9 Relief valve 10 Pressure detector

Claims (5)

[Claims] 1. A door closing device for a railway vehicle for opening and closing a vehicle door using a pneumatic cylinder, wherein the device is provided between a valve body on the door closing side of the pneumatic cylinder and an electromagnetic switching valve communicating with an air pressure source. Door closing force weakening electromagnetic switching valve and a relief valve provided on the exhaust side of the door closing force weakening electromagnetic switching valve. A door closing device characterized in that the cylinder closing pressure is weakened to weaken the door closing force. 2. A door closing device for a railway vehicle that opens and closes a door for a vehicle using a pneumatic cylinder that temporarily weakens the door closing force by energizing an electromagnetic switching valve for weakening the door closing force. In the pneumatic cylinder, a door closing force weakening electromagnetic switching valve provided between a door closing side valve body and an electromagnetic switching valve communicating with an air pressure source, and exhaust of the door closing force weakening electromagnetic switching valve. A door closing device including a relief valve provided on the side and a controller that controls the electromagnetic switching valve for weakening the door closing force, and is capable of controlling the time taken to extract an object when the object is caught between the doors. . 3. A detector for detecting this state when an object is caught between the doors, and the detection signal is transmitted to the electromagnetic switching valve for weakening the door closing force or the controller.
Or the door closing device described in 2. 4. The door closing apparatus according to claim 1, 2 or 3, wherein a pressure detector is provided between the valve body on the door closing side of the pneumatic cylinder and the electromagnetic switching valve for weakening the door closing force. 5. The door closing device according to claim 1, 2, 3 or 4, wherein the device is configured in a railroad vehicle, an automobile or a home door.