JPH0228662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door opening/closing device that opens and closes a door using fluid pressure.

The applicant previously filed Japanese Patent Application No. 56-84980 (Japanese Unexamined Patent Publication No.
57-201484), in order to prevent shock operation when opening and closing the door, a door opening/closing device has a piston movably inserted inside the door that is connected to the door to open and close the door. A double-acting cylinder that forms two pressure chambers is provided between the double-acting cylinder and a pressure fluid source, and after releasing the pressure supplied to one pressure chamber of the double-acting cylinder, the pressure is supplied to the other pressure chamber. and a regulating valve that slowly supplies pressurized fluid to the double-acting cylinder via the switching valve until a predetermined pressure is reached. A similar device is disclosed in Japanese Unexamined Patent Publication No. 12480/1983.

However, the above-mentioned valve has a problem that the structure of the regulating valve is complicated and the manufacturing efficiency is low.

The present invention has been made in view of the above problems, and aims to provide a door opening/closing device equipped with a regulating valve that can improve production efficiency. , a main body having an inlet connected to the pressure fluid source side and an outlet connected to the double-acting cylinder side, a hole provided in the main body communicating with the inlet and the outlet, and a main body movably inserted into the hole, A movable body having an outlet side pressure receiving area larger than an inlet side pressure receiving area, a spring that urges the movable body toward the outlet side with a predetermined preload, and communication between the inlet side and the outlet side of the movable body. a valve device that can close the passage and open it by a movable body that moves against the preload of the spring; and a small valve device that bypasses the valve device and connects the inlet side and the outlet side. It has a passageway.

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

In FIG. 1, 1 is a pressure fluid source, and 2 is a manual operation knob, which is located at a position that communicates the regulating valve 6 side and the pressure fluid source 1, which will be described later, and from the pressure fluid source 1 to the regulating valve 6 side. It can be switched to a position where it is shut off and communicated with the atmosphere. Reference numeral 3 denotes a double-acting cylinder, and its piston 4 is connected to a door (not shown) of a passenger car, for example, and the pressure chambers 3A and 3B partitioned by the piston 4 are connected to a first solenoid valve 5A and a second solenoid valve, respectively. 2 solenoid valve 5B. 1st
When the electromagnetic valve 5A is energized, it is in a position that communicates the outlet 12 and the pressure chamber 3A, and when it is demagnetized, it communicates the pressure chamber 3A with the atmosphere and blocks communication between the pressure chamber 3A and the outlet 12. position. Moreover, when the second solenoid valve 5B is excited,
The pressure chamber 3B is communicated with the atmosphere, and the pressure chamber 3
The position is such that communication between the pressure chamber 3B and the outlet 12 is cut off, and when demagnetized, the position is such that the pressure chamber 3B and the outlet 12 are communicated with each other.

Reference numeral 6 denotes a regulating valve, the main body 7 of which has a hole 8, and a small diameter end 9a at one end where the hole 8 opens.
A plug member 9 having a narrow diameter end 9a is screwed onto the hole 8 side, and an inlet 1 communicating with the hole 8 is attached to the plug member 9.
0 is formed. A plug member 11 having a small diameter end 11a is screwed onto the other end where the hole 8 opens, with the small diameter end 11a facing the hole 8, and the plug member 11 is in communication with the hole 8. An outlet 12 is formed. Furthermore, a small diameter portion 8a is formed approximately at the center of the hole 8.

13 is a movable body, and one end 13a is formed to have a large diameter, so that the area of the pressure receiving surface on the one end 13a side (effective pressure receiving area) S ₁ and the area of the pressure receiving surface on the other end ( A difference is provided between the effective pressure receiving area) S ₂ (<S ₁ ), and one end 13a side is connected to the outlet 12
It is housed in the hole 8 so as to be able to slide in the axial direction toward the side. The movable body 13 is formed with a passage 14 that penetrates in the axial direction, and a groove 13b that is continuous with the passage and crosses the pressure receiving surface on the one end 13a side.

The movable body 13 receives elasticity from the preloaded spring 15 toward the outlet 12 and is pressed against the small diameter end 11a of the plug member 11 in an abutting manner, and is partitioned into the hole 8 by the plug member 11 and one pressure-receiving surface. A chamber A is formed which communicates with the passage 14 through the groove 13b, and at this time, the other pressure receiving surface, which is the pressure receiving area _S2 , is located in substantially the same vertical plane as the end surface of the small diameter portion 8a on the inlet 10 side. Spring 1
5 is one end portion 13a of the movable body 13 and the small diameter portion 8a.
It is interposed between.

Reference numeral 16 denotes a cap-shaped valve device, which is housed on the inlet 10 side of the hole 8 and is connected to the inlet 10 of the small diameter portion 8a.
In cooperation with the 0-side end surface, a valve is configured to open and close the passage 14 with respect to the inlet 10. The valve device 16 has groove-like small passages 16a and 16b on the inner and outer surfaces of the bottom, respectively, and a throttle hole 16 that passes through the bottom.
c is formed, and the small diameter portion 8a is formed by the spring 17.
It is urged toward the side and is seated on the end surface of the small diameter portion 8a on the inlet 10 side. The spring 17 is interposed on the outer periphery of the narrow end 9a of the plug member 9.

Next, the operation of this door opening/closing device will be explained.

The figure shows a door open state in which both the first solenoid valve 5A and the second solenoid valve 5B are excited, the pressure chamber 3B is exposed to the atmosphere, and the pressure chamber 3A is filled with pressure fluid.

(1) Device stoppage stage For example, when parking a bus, first switch the manually operated cock 2 and exhaust the compressed air from the downstream side of the downstream 2 into the cock 2. After that, when the power circuit is turned off, the first solenoid valve 5A,
Both of the second solenoid valves 5B are demagnetized, and the compressed air in the pressure chamber 3A is released to the atmosphere via the first solenoid valve 5A. In addition, the adjustment valve 6 side of the second solenoid valve 5B is already cut off from the pressure fluid source 1 and communicated with the atmosphere by the manual operation knob 2, so it is connected to the pressure chamber 3B via the second solenoid valve 5B. No compressed air flows in. Therefore, both pressure chambers 3A and 3B of the double cylinder 3 become unpressurized, and the door remains open.

(2) Device restart stage In order to resume operation, when the manual operation cock 2 is switched and compressed air is supplied downstream of the cock 2, the compressed air sent from the pressure fluid source 1 to the inlet 10 flows through the throttle hole 16c. With the exception of a portion that flows into the passage 14 through the flow rate restriction and flows into the chamber A from the groove 13b, the flow flows from the outlet 12 through the second electromagnetic valve 5B into the pressure chamber 3B of the double-acting cylinder 3, causing the piston 4 to flow into the pressure chamber 3B. Drive to the right in the figure. (At this stage, the first solenoid valve 5A and the second solenoid valve 5B are each demagnetized, and the first solenoid valve 5A is
The second electromagnetic valve 5B is at a position where the outlet 12 and the pressure chamber 3B are communicated with each other, and the second electromagnetic valve 5B is at a position where the outlet 12 and the pressure chamber 3B are communicated with each other. ) In this way, compressed air flows into the pressure chamber 3B little by little due to the throttling action of the throttle hole 16c, so the internal pressure of the pressure chamber 3B gradually increases, the piston 4 moves slowly, and the door opens. It begins to close.

At the same time as the door begins to close, the internal pressure of room A also begins to gradually increase. When the internal pressure reaches a predetermined pressure, the pressing force due to the predetermined pressure acting on the pressure receiving surface having the pressure receiving area _S1 of the movable body 13 is increased by the pressing force due to the pressure acting on the pressure receiving surface having the pressure receiving area _S2 and the spring 1.
5, the movable body 13 moves to the right in the figure, and the valve device 16
At this time, the valve device 16 is moved away from the end face of the small diameter portion 8a against the elasticity of the spring 17, and the valve device 16 is opened. When the valve device 16 is opened, a large amount of compressed air bypasses the valve device 16 from the inlet 10 through the small passage 16b and begins to flow into the passage 14 via the small passage 16a, so that the internal pressure of the pressure chamber 3B rapidly increases. Then, the piston 4 moves rapidly and the door quickly finishes its closing operation.

(3) Door opening operation First, the second solenoid valve 5B is energized. By this operation, the pressure chamber 3B of the double-acting cylinder 3 is opened to the atmosphere. Next, the first solenoid valve 5A is energized. As a result, compressed air is supplied to the pressure chamber 3A, the door begins to open, and compressed air is supplied until the door is completely opened.

(4) Door closing operation Of the first solenoid valve 5A and second solenoid valve 5B that are energized, first, the first solenoid valve 5A is demagnetized to connect the pressure chamber 3A to the atmosphere. Thereafter, when the second electromagnetic valve 5B is demagnetized, compressed air is supplied to the pressure chamber 3B and the door begins to close, and compressed air is supplied until the door is completely closed.

(5) Manual operation If you try to open the door manually due to an accident, etc., switch the manual operation knob 2 regardless of the excitation/deenergization of the first solenoid valve 5A and the second solenoid valve 5B.
The compressed air on the downstream side of the tank 2 is discharged.
Then, the compressed air in either pressure chamber 3A or 3B is discharged, and the door can be opened easily by manual operation.Furthermore, when switching the Kotoku 2, the shock target operation is prevented.

As described above, according to the present invention, the main body has a simple structure in which a hole is provided that has an inlet and an outlet and communicates the two, and a movable body having a pressure receiving area difference is installed in this hole.
A valve device that opens and closes a passage connecting both ends of the movable body with respect to the inlet is coaxially housed by applying a pushing force toward the outlet of the movable body using a preloaded spring, thereby bypassing the valve device. Since it is only necessary to provide a small passage, the above-mentioned patent application filed in 1983 proposes that the movable body and the valve device are housed in separate holes, and the two holes communicate with each other at the front and back of the movable body.
Compared to the 84980, there are fewer parts,
Since the number of assembly and machining steps is reduced, production efficiency can be improved, and the device can also be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a flow diagram showing a main part of an embodiment of the door opening/closing device according to the present invention in cross section. 1...Pressure fluid source, 2...Manual operation pot, 3...
Double acting cylinder, 3A, 3B...pressure chamber, 5A...first
Solenoid valve, 5B...Second solenoid valve, 6...Adjustment valve, 7...Main body, 8...Hole, 10...Inlet, 12...Outlet, 13...Movable body, 13b...Groove, 14...Passage, 15, 17...Spring, 16...Valve device, 16a, 16b...Small passage, 1
6c...Aperture hole.

Claims (1)

[Claims] 1. A double-acting cylinder provided between the double-acting cylinder and a pressure fluid source, in which a piston connected to the door is movably inserted to open and close the door to form two pressure chambers; A switching valve that releases the pressure supplied to one pressure chamber of the cylinder and then supplies pressure to the other pressure chamber, and controls the supply of pressure fluid to the double-acting cylinder via the switching valve to a predetermined pressure. In the door opening/closing device, the regulating valve has a main body forming an inlet connected to a pressure fluid source side and an outlet connected to a double-acting cylinder side; and a hole provided in the main body in communication with the outlet, a movable body that is movably inserted into the hole and has a pressure receiving area on the outlet side larger than the pressure receiving area on the inlet side, and a predetermined preload on the movable body. a spring biased toward the outlet side by the movable body; a passage connecting the inlet side and the outlet side of the movable body; and the passage can be closed and opened by the movable body moving against the preload of the spring. A door opening/closing device comprising a valve device and a small passage that bypasses the valve device and connects an inlet side and an outlet side.