JPS5942468Y2 - Buffer device for door closing machine - Google Patents

Description

[Detailed Description of the Invention] A door closing machine mainly used for vehicles is designed to reduce the speed at the end of each stroke of door closing and door opening to prevent danger.

However, in recent years, when the door is full of passengers, the movement of the door is restricted during the door closing process, and in some cases, staff members have to forcibly hold the door with their hands to stop the door from moving. It often happens that normal speed control cannot be performed at the end of the door closing stroke.

No matter where the door is located, it is possible to control the speed at the end of the stroke and perform a buffering operation, and at the end of the door closing stroke, a normal door closing force is generated to ensure that the door is fully occupied. This design prevents the door from opening while the vehicle is in motion due to the movement of passengers.

This will be explained in detail below with reference to the drawings.

FIG. 1 is a diagram showing an example of an air circuit of a conventional door closing machine, and shows the door in an open state.

1 is a door closing machine, 1a is a cylinder for closing the door, 1b is a small cylinder for opening the door, and a large piston 2 slides inside these cylinders.
and the small piston 3 are connected by a rack 4.

A sector gear 5 that meshes with the rack 4 is rotatably supported at a point A, and the upper end of an opening/closing arm 6 connected to the sector gear 5 is connected to a door 7 via a roller.

82g' is a bypass circuit installed in the middle of the stroke of both large and small cylinders, s, d, 10.1d are reverse valves, 11° 11
12 and 12' are adjustment throttles, 13 is a solenoid valve, 141a is piping to both the large and small cylinders, and 15 is an air reservoir.

In the illustrated door open state, the solenoid valve 13 is energized, and pressurized air from the air reservoir 15 enters both the large cylinder 1a and the small cylinder 1b through the pipes 14 and 1a, respectively, so that the piston 2° 3 is pushed toward the small cylinder 1b side, and the door 7 is in the left door open position.

In this state, when the solenoid valve 13 is demagnetized to close the door, the pipe 14 is connected to the atmosphere and the pressurized air inside the cylinder 1a is transferred to the bypass circuit 8. It is exhausted to the atmosphere via the check valve 9 and the solenoid valve 13.

On the other hand, since the small cylinder 1b is a housing containing pressurized air, when the air pressure inside the large cylinder 1a, which is exhausted to the atmosphere, falls below a certain pressure, the pistons 2 and 3 move to the left.
As the door 7 moves to the right, the door closing process begins.

When the piston 2.3 moves to the left and the piston 2 passes through the inlet point B of the bypass circuit 8, the pressurized air in the large cylinder 1a is not exhausted from the bypass circuit 8, but instead flows through the adjustment throttle valve 1.
1 and then from the solenoid valve 13, so the adjustment orifice 11
The displacement is limited by the 0 action, and the air pressure inside the large cylinder 1a rises rapidly due to the compression by the piston 2, and the speed at which the door moves is also controlled to limit the leftward movement of the piston 2. buffering operation is performed.

Even when the door is open, the operations of the bypass circuit d and the adjustment diaphragm 11' are almost the same as those when the door is open, so a description thereof will be omitted.

Regulating throttle 1 connected in series to check valve 10.10'
2.1 is the large cylinder 1a and small cylinder 1, respectively.
This is to adjust the amount of pressurized air that is injected into the hole, and the speed at which the door moves before it enters the buffering operation.

In the conventional circuit described above, if a passenger gets stuck in the door during the door closing process and the attendant forcibly stops the closing operation of the door 7 by hand to prevent danger, Even when the door closing operation is stopped, the pressurized air in the large cylinder 1a continues to be exhausted from the solenoid valve 13, so when the door 7 is released from its mid-stop, the air pressure in the large cylinder 1a becomes atmospheric pressure 1. Sometimes I go down there and there's one.

In such a case, even if the pistons 2 and 3 move to the left, the air pressure in the large cylinder 1a will hardly increase, so the door 7 tends to crash into the doorstop without slowing down after stopping halfway. It is dangerous.

FIG. 2 is a diagram showing an embodiment of the air circuit of the door closing machine according to the present invention, showing the door in the open state similarly to FIG. 1, and the same parts are given the same reference numerals.

A door-closing cylinder 1a having a cylinder diameter Da and a small door-opening cylinder 1b having a cylinder diameter Db are connected through an air pipe 16 and a pressure reducing valve 17 at the pistons 2 and 30, respectively.

A rubber valve 18 is supported by a spring 19 and installed at the end position of the large cylinder 1a corresponding to the opening C of the air pipe 16 of the piston 2.

In order to demagnetize the solenoid valve 13 and move the door from the illustrated door-open state where the solenoid valve 13 is energized, when the air pressure in the air reservoir is P, the set pressure P of the pressure reducing valve 17 is )'<P It is necessary to set the value to X (Db/Da)2, but according to experiments with door closing machines used in ordinary trains, it has been found that the appropriate value is PX (Db/Da)2/3. ing.

If the pressure reducing valve 17 set in this way is installed between the large cylinder 1a and the small cylinder 1b via the air pipe 16, even if the door 7 is stopped midway by an attendant during the door closing process, the inside of the small cylinder 1b will be removed. Since the pressurized air is supplied through the air pipe 16 and the pressure reducing valve 17, the air pressure inside the large cylinder 1a does not fall below the set pressure of the pressure reducing valve 17.

For this reason, even when the door is released from its mid-stop, the piston 2 moves to the left and the air pressure inside the large cylinder 1a immediately increases to the pressure 1 necessary to limit the speed of the door. Door 7 does not collide with the doorstop and is safe.

However, if the pressurized air in the small cylinder 1b is supplied into the large cylinder 1a through the air pipe 16 and the pressure reducing valve 17 even when the door 7 is in the closed position, the air pressure in the large cylinder 1a will be atmospheric pressure. Instead, the pressure is maintained at the set pressure of the pressure reducing valve 17, and the door closing force (π/
4) In Db2P, the door closing force is reduced by (π/4)Da', so the risk of the door 7 being opened due to the movement of passengers increases when the passenger is full, and, The pressure air supplied from the small cylinder 1b to the large cylinder 1a is passed through the adjustment throttle 11. Since the pressurized air is exhausted to the atmosphere through the solenoid valve 13, the pressure air is always exhausted to the atmosphere when the door is closed. The amount becomes too large.

In the present invention, a rubber valve 18 supported by a spring 19 is installed at the terminal position of the large cylinder 1a. Close the opening C of the air pipe 16 of the small cylinder 1.
Since the supply of pressurized air from b to the large cylinder 1a is stopped, the pressure inside the large cylinder 1a becomes atmospheric pressure.

Therefore, the door closing force is not weakened when the door is in the closed position, and the door 7 is securely closed and safe while driving.
It is economical because no pressurized air is exhausted into the atmosphere.

As explained in detail above, the shock absorber of the door closing machine of the present invention is capable of operating the door closing cylinder 1 at any position other than the final end position of the door closing stroke.
The pressure reducing valve 17 is set so that the pressure inside a does not fall below an appropriate pressure, and the circuit of the pressure reducing valve 17 is blocked by the rubber valve 19 in the door closing position, so that the door γ is
Even if the door 7 is forcibly stopped midway, the speed buffering action of the door 7 is not lost, and the door closing force is not weakened in the door closing position, and the consumption of pressurized air is reduced compared to the conventional method. It is characterized by the fact that it does not increase the number of passengers, and is extremely effective in preventing danger to passengers.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of an air circuit of a conventional door closing machine, and FIG. 2 is a diagram showing an example of an air circuit of a door closing machine according to the present invention. 1...Door closing machine, 1a...Large cylinder, 1b...Small cylinder, 2, 3...Piston, 4...Rack・5°°°°°° sector gear, 6...opening/closing arm, 7...door, 8,
g...Bypass circuit, s, d, 1o, 1d
...Check valve, 11, 11', 12.1i...
... Adjustment number J, 13 ... Solenoid valve, 14, 14
'...Piping, 15...Air reservoir, 16.
...Air pipe, 17...Reducing valve, 18...
...Rubber valve, 19...Spring.

Claims (1)

[Scope of utility model registration request] By changing the areas of the door closing and door opening cylinders, the opening and closing operations can be performed simply by controlling the pressure sent to the door closing cylinder, and a buffer mechanism is installed by installing a bypass circuit at the end of the opening and closing stroke. In the door-closing machine, a pressure reducing valve is installed between the door-closing cylinder and the door-opening cylinder so that the air pressure in the door-closing cylinder does not fall below a certain level, and the piston is installed at the end of the door-opening cylinder. 1. A shock absorbing device for a door closing machine, characterized in that when the pressure reducing valve is in an end position, the air circuit of the pressure reducing valve is blocked to eliminate the function of the pressure reducing valve.