JPS5932685B2 - cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder device in which two sets of cylinder mechanisms can be operated in four ways by operating two switching valves, particularly for opening and closing double doors such as those found in railway vehicles. 0 concerning a cylinder device suitable as a cylinder device having two sets of cylinder mechanisms each including a cylinder, a piston slidably inserted into the cylinder, and a piston rod extending from the piston and protruding outside the cylinder.
Two sets of switching valves are incorporated into the pressure fluid control circuit that controls the supply and discharge of pressure fluid to the two sets of cylinder mechanisms, and by operating these two switch valves, the two sets of cylinder mechanisms can be operated in several ways. There is a cylinder device designed to do this.

That is, for example, when opening and closing a double door on a railway vehicle, there are devices that can perform three operations: automatic opening, automatic closing, and manual opening.

However, in this type of conventional cylinder device,
As mentioned above, only two switching valves can be operated in a maximum of three ways, and cannot fully meet the current demands in the field of railway vehicles, which are often used for opening and closing doors.

In other words, in railway cars with double doors that connect cities and suburbs, it is being considered to open only one door at stations where there are few passengers getting on and off in order to improve heating and cooling efficiency.
In addition to the three operations described above, it was completely impossible to open only one door.

An object of the present invention is to provide a cylinder device that eliminates the above-mentioned problems.

The present invention will be described in detail below based on embodiments shown in the drawings.

In FIG. 1, reference numeral 1 denotes a main body, and the main body 1 also serves as the cylinders of the two upper and lower cylinder mechanisms A and H in the figure.

Two pistons 2A and 2B are fitted into the main body 1 so as to be slidable in the left and right directions in the figure, and a piston rod 3A integrated with the two pistons is slidably inserted through the main body 1 to the right in the figure. A piston throat 3B, which is integrated with the piston 2B, slidably penetrates the main body 1 and projects to the left in the figure.

Of the two chambers 4A and 5A in the cylinder mechanism A defined by the two pistons, the chamber 4A facing the back side of the two pistons (the side without the piston pad 3A) has a chamber 4A formed in the main body 1. Two passages 6A and 7A8A are opened, two of which are
The two passages 6A, 7A are opened at the ends of the chamber 4A, and the passage 8A is opened slightly inward from the ends within a distance shorter than the axial length of the two pistons.

The passage 6A is provided with a check valve 9A that only allows pressure fluid to flow into the chamber 4A, and the passage 7A is provided with a throttle valve 1.
0A is provided, and the passage 8A is provided with a check valve 11A that only allows pressure fluid to flow outside the chamber 4A.

These three passages 6A, 7A, 8A communicate with a passage 12A formed in the main body 1, and these four passages 6A, 7A, 8
A and 12A constitute a supply and discharge path for pressure fluid to the chamber 4A.

Moreover, in the other chamber 5A formed in the cylinder mechanism A, there are three passages 13A formed in the main body 1.

14A and 15A are opened, of which passage 13A is connected to chamber 5.
A, the passage 14A is opened at the corner of the end of the chamber 5A, and the passage 15A is opened slightly inward within a distance shorter than the axial length of the two pistons.

The passage 13A is provided with a check valve 16A that only allows pressure fluid to flow into the chamber 5A, the passage 14A is provided with a throttle valve 17A, and the passage 15A is provided with a check valve 16A that allows pressure fluid to flow only into the chamber 5A.
A check valve 18A is provided that allows flow only to outside A.

These three passages 13A, 14A. 15A communicates with a passage 19A formed in the main body 1, and these four passages 13A,
14A, 15A.

19A constitutes a supply/discharge path for pressure fluid to the chamber 5A.

On the other hand, also in the cylinder mechanism B, two chambers 4B and 5B are defined by the piston 2B, and this compartment 4
A pressure fluid supply/discharge path to B and 5B is formed in the main body 1.

The passages, check valves, and throttle valves in this supply/discharge passage section are constructed in the same manner corresponding to the cylinder mechanism A, so components corresponding to those of the cylinder mechanism A will be designated by the reference numerals. Duplicate explanation will be omitted by using "B" instead of "A" in the middle.

Each valve 9B is provided in the passage 12B of the cylinder mechanism B.

An automatic on-off valve 20 is provided upstream of 10B and 11B.

The on-off valve 20 has a valve chamber 22 formed in the main body 1 and defined by a partition plate 21 with respect to the passage 12B, and a valve chamber 22 that is slidably inserted into the valve chamber 22 and slidably passes through the partition plate 21. A valve body 24 is installed in one chamber 25 of the valve chamber 22 defined by the valve body 24, and the valve body 24 is connected to the valve seat. 23 and the other chamber 27 of the valve chamber 22, the other chamber 27 is communicated with the chamber 5A in the cylinder mechanism A via the communication passage 28. There is.

Therefore, when the pressure inside the chamber 5A is low, the valve body 24 is separated from the valve seat 23, the passage 12B is opened, and the chamber 5A
When the internal pressure increases, the valve body 2 resists the biasing force of the spring 26.
4 is seated on the valve seat 23, and the passage 12B is closed.

One passage 12A of the cylinder mechanism A is connected to a switching valve 30 via a communication passage 29.

The switching valve 30 is a three-point electromagnetic switching valve,
One of the remaining two ports other than the port connected to the communication path 29 is connected to the communication path 31 extending from the pressure fluid source, and the other is open to the low pressure source.

This low pressure source is, for example, an oil return tank when pressure oil is used as the pressure fluid, or the atmosphere when compressed air is used as the pressure fluid.

Such a switching valve 30 communicates the communication passages 29 and 31 in the illustrated state in which the coil 32 is demagnetized, and communicates the communication passage 29 with the low pressure source when the coil 32 is energized. It becomes.

The other passage 19A of the cylinder mechanism A is connected to a switching valve 34 via a communication passage 33.

The switching valve 34, like the switching valve 30, is a three-point, one-two-position electromagnetic switching valve, and the remaining two ports other than the port to which the communication passage 33 is connected are connected to one of the two ports, like the switching valve 30. is connected to the communication path 31 extending from a pressure fluid source,
The other is open to a low pressure source.

Contrary to the switching valve 30, the switching valve 34 communicates the communication passage 33 with the low pressure source when the coil 35 is demagnetized, and connects the communication passage 33 with the low pressure source when the coil 35 is energized. and 31 are connected to each other.

Both cylinder mechanisms A and B are connected by a communication passage 28 via the on-off valve 20, and an on-off valve 20 between the passage 12A of cylinder mechanism A and the passage 12B of cylinder mechanism B.
The communication path 36 is connected to the upstream side by a communication path 36 which is a branch of the communication path 29.

Furthermore, the passage 19A of the cylinder mechanism A and the passage 19B of the cylinder mechanism B are connected by a communication passage 37 that is a branch of the communication passage 33.

The operation of the cylinder device configured as described above will be explained in the following four cases, which are combinations of ON and OFF operations of the two switching valves 30 and 34.

- When both the switching valves 30 and 34 are OFF, this is the state shown in FIG. The on-off valve 20 is opened.

This results in room 4A. 4B is supplied with pressure fluid, while chamber SA.

5B is released to a low pressure source and piston rod 3A.

3B is the direction of extension, 3A is 3A to the right in Figure 1 and 3
B is driven to the left in FIG.

The driving speed of these piston rods 3A and 3B is the throttle valve 10.
It is set to a desired value by adjusting the opening degrees of piston rods A and 10B, and the piston rod 3A.

3B, pistons 2A and 2B are passages 15A.

Immediately after blocking 15B, the speed is decelerated and it comes to a slow stop.

(2) When both the switching valves 30 and 34 are ON, the communication passage 33 is communicated with the communication passage 31 extending from the pressure fluid source, and the communication passage 29 is opened to the low pressure source.

As a result, pressure fluid is supplied to the chambers SA and 5B, while chambers 4A and 4B are released to the low pressure source, and the piston rod 3
A and 3B are driven in their contraction directions, that is, 3A is driven to the left in FIG. 1, and 3B is driven to the right in FIG.

The driving speed of the piston rods 3A and 3B at this time is the throttle valve 17A.

The desired value is set by adjusting the opening degree of the piston rod 17B, and the piston rods 3A and 3B are connected to the pistons 2A and 2.
Immediately after B closes the passages 8A and 8B, the speed is decelerated and it slowly comes to a stop.

Note that the pressure in the chamber 5A acts on the chamber 27 of the on-off valve 20, but while the chamber 5A is expanding due to the contraction direction displacement of the piston rod 3A, the pressure in the chamber 27 does not rise to the pressure of the pressure fluid. The open state is maintained and the displacement of the piston rod 3B in the contraction direction is not hindered.

After the piston rod 3A is displaced to the stroke end in the contraction direction (at this time, the piston rod 3B is also displaced to the stroke end in the contraction direction), the chamber 2
The pressure inside 7 gradually increases to the pressure of the pressure fluid, and eventually the on-off valve 20 closes.

■ When the switching valve 30 is ON and the switching valve 34 is 0FFv17), both communication passages 29, 33 are both released to the low pressure source, and the on-off valve 20 is also open, so each chamber 4A, 4B, and 5 A t 5 B are each released to a low pressure source.

Therefore, the piston rods 3A and 3B can be freely moved by manually operating them.

■ When the switching valve 30 is OFF'F and the switching valve 34 is ON, the communication passages 29 and 33 are both communication passages 31 extending from the pressure fluid source.
At this time, when the switching valve 20 is closed after the above operation (2), pressure fluid is supplied to the chambers 4A, 5A, and 5B, but not to the chamber 4B. Only the piston rod 3A is driven in the extension direction due to the difference in effective pressure receiving areas on both sides of the piston 2A, and the piston rod 3B remains in a stopped state.

FIG. 2 shows another embodiment of the present invention. In the embodiment described above, the chamber 5 on the side where the piston pressure receiving area is small
If pressure fluid is supplied only to A t 5 B to displace the piston rod 3 A t 3 B in the direction of contraction, the sealing properties of the sliding parts of the pistons 2A and 2B will deteriorate and the IJ IJ- of the switching valve 30 will deteriorate. Even if the function is impaired,
Piston rods 3A, 3B (7) In order to always ensure the above displacement, a safety valve (relief valve) 38 is incorporated to ensure the discharge of pressure fluid from the chambers 4A, 4B on the side where the piston pressure receiving area is dog. It is something.

To explain the safety valve 38, its main body 39 has two cylinder portions 39a of different sizes and diameters which are connected to each other in a stepped manner.
t39b, and a valve body 4 is disposed within the small diameter cylinder portion 39b.
A free piston 41 is slidably inserted into the large-diameter cylinder portion 9a, and a free piston 41 is slidably inserted into the main body 39 from the upper side in FIG.
Three chambers 42, 43, 44 are defined.

The valve body 40 has a pair of protrusions extending from both sides of the piston portion 40a, one of which serves as a receiving portion 40b and can freely approach and separate from the free piston 41, and the other protrusion serves as the valve portion 40c and extends from the main body. The valve seat 46 is located in the middle of a passage 45 formed at 39, and can be moved into and out of the valve seat 46.

In addition to the passage 45, the main body 1 is formed with a passage 47 opening into the chamber 42, a passage 48 opening into the chamber 43, and a passage 49 opening into the chamber 44.

In addition, 50 in the figure is the main body 1 in order to ensure the minimum volume of the chamber 42.
It is a protrusion formed on the

The passage 47 of the safety valve 38 is connected to a communication passage 51 which is a branch of the communication passage 29, and the passage 49 is connected to a communication passage 52 which is a branch of the communication passage 33.

Further, one end opening 45a of the passage 45 is formed by a communication passage 53 and a communication passage 54 branched from the communication passage 53, so that the pistons 1 of the cylinder mechanisms A and B have a smaller pressure receiving area.
4B using, for example, passages 7A and 7B.

Furthermore, the other end opening 45b of the passage 45 and the passage 48 are open to a low pressure source.

Next, the operation of the safety valve 38 will be explained. As is clear from the above explanation, this safety valve 3B ensures the discharge of pressure fluid from the chambers 4A) and 4B especially in the mode (2) described in the above embodiment. It is intended for the purpose of

That is, in the case of aspect (2) in the above embodiment, pressure fluid is supplied to the chambers SA and 5B of the cylinder mechanisms A and H, and the chamber 4 is
A, 4B are released to the low pressure source, and at this time, pressure fluid is supplied to the chamber 44 of the safety valve 3B, so the valve body 40 is pressed upward to open the passage 45.

Therefore, the chambers 4A, 4B of the cylinder mechanisms A, B are opened directly to the low pressure source via the passage 45, and the pistons 2A,
The seal of the sliding part of 2B deteriorates and the IJ of the switching valve 30
Even if the IJ-F function fails, both piston rods 3 A t 3 B are reliably driven in the contraction direction.

In the case of mode ■■■ in the above embodiment, the safety valve 38 is closed and the chambers 4A and 4B of the cylinder mechanisms A and B are closed.
is maintained in a sealed state.

FIG. 3 shows a case where the cylinder device of the present invention is applied to open and close a double door.

In the figure, for example, a railway vehicle 55 is provided with a right door 56 and a left door 57, each of which is slidable.
6. Main body 1 of the cylinder device of the present invention above 57
is fixed.

The piston rod 3A of one cylinder mechanism A is connected to the right door 56 via a bracket 58, and the piston rod 3B of the other cylinder mechanism B is connected to the left door 57 via a bracket 59.

The door opening/closing device configured in this way has the above-mentioned switching valve 3.
Depending on each of the four switching modes of 0°34, automatic full opening,
Automatic full closing, manual full opening/closing, and automatic single opening (only the right door 56 is opened) are performed.

That is, the above-mentioned switching mode (2) of the switching valve 30.34 causes automatic full opening, switching mode (2) automatically fully closes, switching mode (2) manual full opening/closing, and switching mode (2) automatically opens one side.

When applied to such a door opening/closing operation, the switching mode ■■■ is always selected after the automatic full closing, that is, the switching mode ■■■.Therefore, when the switching mode The valve 20 is closed in advance, and automatic one-sided opening is reliably performed.

Further, when the safety valve 38 is installed in the cylinder device, as can be understood from the above explanation, the IJI of the switching valve 30
Even when there is a problem with the J-F function, automatic full closing is reliably performed, ensuring the safety of passengers and others.

In addition, the opened door after automatic one-sided opening (right door 56 in this example)
When closing both doors 56, 5, which were opened after automatic full opening,
Similar to closing 7, this is done by automatic full opening.

As described above, the present invention includes the operation of two electromagnetic switching valves,
In other words, by combining 0N-OFF, it is possible to supply and discharge fluid to a chamber partitioned by the pistons of two sets of cylinder mechanisms, or to stop the supply and discharge of fluid to a predetermined chamber by operating an automatic on-off valve, or to By communicating the chambers with a low pressure source, it is possible to cause the two sets of cylinders to perform four different operations, greatly increasing the scope of application of this type of cylinder device.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing one embodiment of the present invention, Fig. 2 is a cross-sectional view showing another embodiment of the present invention, and Fig. 3 is a case in which the device of the present invention is used for opening and closing a double door. FIG. A, B...Cylinder mechanism, 1...Body (cylinder), 2A, 2B...Piston, 3
A t 3 B...Piston Rondo, 4A, 4
B... Chamber (on the side where the piston pressure receiving area is larger), 5
A, 5B... (on the side where the piston pressure receiving area is smaller)
Chamber, 20...Opening/closing valve, 30...First switching valve, 34...Second switching valve, 38...
··safety valve.

Claims (1)

[Claims] 1. Two sets of cylinder mechanisms in which the inside of each cylinder is defined by a piston into two chambers, and piston rods extending from one side of the piston extend outside the cylinders in opposite directions; and the two sets of cylinder mechanisms. a first electromagnetic switching valve that selectively communicates each of the four chambers with a larger piston pressure receiving area with a pressure fluid source and a low pressure source;
a second electromagnetic switching valve that selectively connects each of the four chambers with a smaller piston pressure receiving area to a pressure fluid source and a low pressure source; and one cylinder mechanism of the two cylinder mechanisms. An automatic opening/closing valve that is operated by the pressure of the chamber on the side where the piston pressure receiving area of the other cylinder mechanism is small is connected to the thread path between the chamber on the side where the piston pressure receiving area is smaller and the first switching valve. By combining ON-OFF of the first and second electromagnetic switching valves, both piston rods can be extended or contracted simultaneously, or only one piston rod can be operated by operating an automatic opening/closing valve. A cylinder device characterized in that it can be operated in four ways: extended operation, or manual operation by communicating all of the cylinder chambers to a low pressure source.