JP3849954B2 - Movable floor fixing device lock cylinder piston state detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a hydraulic cylinder piston constituting a fixing device attached to a movable floor whose floor surface is movable up and down, such as a pool, a bathtub, or a bleacher seat, is in a locked state (state in which the fixing device is fixed) and an unlocking device. The present invention relates to a state detection device for a movable floor fixing device locking cylinder piston that detects whether it is in a locked state (state in which the fixing device is movable) or a failure state. In particular, the fluid pressure cylinder piston is in a failure state. The present invention relates to a movable floor fixing device locking cylinder piston state detection device that can easily detect this situation.
[0002]
[Prior art]
In recent years, swimming and underwater exercises are gaining popularity regardless of age or gender in order to improve health or improve athletic performance. A desired amount of water is stored in advance in a pool for performing such swimming. However, when the depth of the stored water is adjusted to the height of an adult, for example, it is too deep when a child performs swimming or various underwater exercises, which is not preferable in terms of safety management. On the other hand, adjusting the water depth according to the height of the child is too shallow for an adult and is inconvenient.
[0003]
In order to eliminate such problems, the water depth should be adjusted as appropriate in consideration of the height of the person (group) who performs the above swimming, etc. Will cause trouble.
[0004]
In order to eliminate any of the above-described problems, a technique for providing a movable floor in a pool has been considered. For example, Japanese Patent Publication No. 4-54025 discloses a movable floor as shown below. That is, as shown in FIG. 8, the pneumatic floor 3 is provided in the fixed floor 2 of the pool 1, and the bellows type support 4 is attached to the outlet of the pneumatic path 3 so that the movable floor 5 is supported from below. The movable floor 5 can be raised by supplying air to the bellows type support column 4 through the pneumatic feeding path 3. In addition, it replaces with the said bellows type | formula support | pillar 4, and the technique using fluid pressure cylinder pistons, such as an air cylinder piston, is also known.
[0005]
In a pool having a conventional movable floor as described above, the movable floor 5 is supported from below depending on the area of the movable floor, the height (depth) of the movable floor, or the number of people who use it at the same time. It needs to be fixed. As one of the support devices that perform such support and fixing, a fixing device (lock device) called Scissors is known. As illustrated in FIG. 9, the locking device includes a distal end portion (upper end portion in FIG. 9) of the first arm 11 attached to the fixed floor 2 and a second arm 12 attached to the lower portion of the movable floor 5. The front end (the lower end in FIG. 9) is pivotally supported via a chrysanthemum seat 13. When the Kikuza 13 is engaged, the first and second arms 11 and 12 are held in this state, and the movable floor 5 does not move (locked state). On the contrary, when the engagement of the chrysanthemum seat 13 is released, the first and second arms 11 and 12 are rotatable about the pivotal support portion (chrysanthemum seat 13), and the movable floor 5 is movable. State (unlocked). As shown in FIG. 10, the engagement and release of the engagement of the seat 13 are performed by pushing and pulling the piston rod of the air cylinder piston 7 provided on the seat 13.
[0006]
As shown in FIG. 11, the air cylinder piston 7 is provided with a piston (not shown) that is loosely fitted in the cylinder cylinder 9 in a bottomed hollow cylinder cylinder 9. One end of a rod 10 that is tightly inserted through the bottom of the cylinder tube 9 is fixed to the piston. Further, first and second communication holes (not shown) are formed at both ends of the cylinder tube 9, and pipe lines (not shown) connected to the first and second communication holes, respectively. ) To feed the compressed air into the cylinder tube 9 so that the rod 10 can protrude and retract. Each of the arm portions is connected to the first arm portion 11 and the second arm portion 12 (see FIG. 10) constituting the elevating arm 8 (see FIG. 10) by connecting and connecting the first and second arm portions 11 and 12 (see FIG. 10). By being bent at a desired angle, 11 and 12 can follow an arbitrary position of the movable floor 5.
[0007]
By the way, in order to raise and lower the movable floor 5 as described above, it is necessary to raise and lower after confirming that the lock device is in the unlocked state. However, since the lock device including the air cylinder piston 7 is located in the water, it is difficult to detect the protruding and retracted state of the rod 10 of the air cylinder piston 7 as it is. For this reason, conventionally, proximity switches (not shown) are respectively provided between the position of the piston when the rod 10 is most protruded (unlocked) and the position of the piston when the rod 10 is most retracted (locked). The projection state and the retracted state of the rod 10 are detected by the proximity switch.
[0008]
[Problems to be solved by the invention]
However, the air cylinder piston 7 configured as described above has the following disadvantages. That is, the proximity switch is inevitably deteriorated with use. In particular, since the air cylinder piston 7 and the locking device are located in water, the proximity switch inevitably exists in the water, and a failure occurs due to the entry of moisture into the proximity switch. May be easier. Furthermore, when the proximity switch fails, in order to perform repair or replacement, it is necessary for the operator to submerge in the water.
[0009]
The movable floor fixing device lock cylinder piston state detection device according to the present invention was devised in view of the above-mentioned circumstances, and the object thereof is movable despite a simple and inexpensive configuration. Easily determine whether the fluid pressure cylinder piston constituting the fixing device attached to the floor is in a state corresponding to the locked state of the locking device, a state corresponding to the unlocked state of the locking device, or a failure state An object of the present invention is to provide a state detection device for a cylinder piston for detecting a movable floor fixing device lock.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the movable floor fixing device locking cylinder piston state detecting device, the fluid pressure cylinder piston provided in the fixing device attached to the movable floor which is movable up and down includes the locking state of the fixing device. It is detected whether there is a state corresponding to the state, a state corresponding to the unlocked state of the fixing device, or a failure state.
[0011]
In such a movable floor fixing device lock cylinder piston state detection device according to the first aspect of the present invention, the one end side in the cylinder cylinder constituting the fluid pressure cylinder piston is further one end than the piston position at the time of locking. A first communication hole formed on the side, one end of which is connected to the fluid reservoir, and the other end of the first communication hole connected to the first communication hole. And a first switching valve provided. Also, a second communication hole formed on the other end side in the cylinder cylinder constituting the fluid pressure cylinder and further on the other end side than the position of the piston at the time of unlocking, and one end of the second switching hole is the first switching valve. And a second conduit having the other end connected to the second communication hole. Furthermore, a third communication hole provided on the other end side of the cylinder tube, a third pipe line having one end connected to the fluid storage portion and the other end connected to the third communication hole, A pressure reducing valve provided in an intermediate portion of the third conduit, a check valve provided in the intermediate portion on the other end side from the pressure reducing valve, and a second end in the intermediate portion from the check valve. A second switching valve provided on the side, a first pressure sensor provided between the second switching valve and the third communication hole, for detecting a predetermined first set pressure, Similarly, a second pressure sensor provided between the second switching valve and the third communication hole for detecting a second set pressure lower than the first set pressure is provided.
[0012]
The first switching valve communicates the first conduit with the atmosphere and communicates the second conduit with the fluid reservoir, and communicates the first conduit with the fluid reservoir. The second switching valve can be switched to either the state in which the second pipe communicates with the atmosphere, and the second switching valve is in a state in which the third pipe communicates with the atmosphere, and the third pipe is in fluid storage. The state can be switched to any of the states communicating with the section.
[0013]
When the fixing device is locked, the fluid pressure cylinder piston is fixed when the first and second pressure sensors both detect a value equal to or higher than each set pressure. Assuming that the device has reached the locked state, when the fixing device is shifted to the unlocked state, the first pressure sensor does not detect a value higher than the set pressure, and only the second pressure sensor is set. When the fluid pressure cylinder piston reaches the unlocking state when the second detection state is detected in which a value equal to or higher than the pressure is detected, and the fixing device is changed from the locked state to the unlocked state. When the first and second pressure sensors indicate a third detection state in which neither of the values exceeds the set pressure, the fluid pressure cylinder piston is assumed to be in a failure state.
[0014]
Since the movable floor fixing device locking cylinder piston state detecting device according to the present invention is configured as described above, the fluid pressure cylinder piston constituting the fixing device attached to the movable floor is in the locked state of the fixing device. It is possible to easily detect whether the state is a corresponding state, a state corresponding to the unlocked state of the fixing device, or a failure state. That is, when the fixing device is locked, both the first and second pressure sensors detect values equal to or higher than the respective set pressures (indicating the first detection state), whereby the fluid pressure cylinder piston Can know that the fixing device has reached the locked state. Further, when the fixing device is shifted to the unlocked state, the first pressure sensor does not detect a value higher than the set pressure, and only the second pressure sensor detects a value higher than the set pressure. By doing (indicating the second detection state), it is possible to know that the fluid pressure cylinder piston has reached the fixing device in the unlocked state. Further, when the fixing device is changed from the locked state to the unlocked state, when the first and second pressure sensors do not detect a value equal to or higher than the set pressure (indicating the third detection state). It is possible to detect that the fluid pressure cylinder piston is in a failure state.
[0015]
In addition, the above-described configuration can be easily configured, and as a result, the manufacturing cost does not increase, so that it can be configured simply and inexpensively.
[0016]
In addition, as described in claim 2, in the structure described in claim 1 described above, a fourth communication provided on one end side of the cylinder tube (for example, a position aligned with the first communication hole). A hole, one end connected to the fluid reservoir, and the other end connected to the fourth communication hole, a pressure reducing valve provided in the middle of the fourth line, A check valve provided at the other end side of the pressure reducing valve at the intermediate portion; a third switching valve provided at the other end side of the check valve at the intermediate portion; and the third switching valve. A third pressure sensor provided between the valve and the fourth communication hole for detecting a predetermined third set pressure, and similarly between the third switching valve and the fourth communication hole. A fourth pressure sensor that detects a fourth set pressure that is lower than the third set pressure, and whether the fixing device is in an unlocked state. It is also possible to detect a fault condition of the fluid pressure cylinder piston in the time of transition to the locked state. In this case, the third switching valve can be switched between a state in which the fourth pipe line communicates with the atmosphere and a state in which the fourth pipe line communicates with the fluid storage section. When the fixing device is changed from the unlocked state to the locked state, the third and fourth pressure sensors do not detect a value equal to or higher than the set pressure. It can be known that the pressure cylinder piston is in a failure state.
[0017]
If comprised in this way, in addition to the detection of the locked state of the fixing device, the detection of the unlocked state, and the detection of the failure of the fluid pressure cylinder piston at the transition from the locked state to the unlocked state, It becomes possible to detect a failure of the fluid pressure cylinder piston at the time of transition from the unlocked state to the locked state.
[0018]
Furthermore, as described in claim 3 or claim 4, the first detection state is locked state, the second detection state is unlocked state, the third detection state is failure state, and the fourth detection state is It is also possible to provide a notification means that can be notified as a failure state. By providing such a notification means, the locked state, unlocked state, and failure state can be known at a glance, and the practicality is improved. As the notification means, a display device can be adopted as described in claim 5, or a light emitting element can be adopted as described in claim 6.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
The movable floor fixing device locking cylinder piston state detection device according to this embodiment is an embodiment in which the present invention is applied to a fixing device (locking device) called the scissors, and is shown in FIGS. Thus, the air cylinder piston 14, the first and second pressure reducing valves 15, 16, the first and second electromagnetic valves 17, 18, these members 15, 16, 17, 18 and the air cylinder piston 14 Are appropriately connected as shown in the figure, and first, second, and third pipelines 19, 20, and 21 and first and second pressure sensors 22 and 23 are provided.
[0020]
That is, the position of the piston 30 when the locking device is locked on one end side of the cylinder cylinder 9 constituting the air cylinder piston 14 which is a fluid pressure cylinder piston (the right end side in FIGS. 1, 2, 5, and 6). Further, the first communication hole 24 is provided at one end side, and the piston at the time of unlocking the locking device on the other end side in the cylinder cylinder 9 (left end side in FIGS. 1, 2, 5, and 6). The second communication hole 25 is formed on the other end side further than the position 30, and the third communication hole 26 is formed on the other end portion of the cylinder tube 9 at a position aligned with the second communication hole 25. ing. Furthermore, one end is connected to an air tank 31 (see FIG. 5), which is a fluid reservoir, and the other end is connected to the first communication hole 24, and one end is connected to the first switch. A second pipe line 20 connected to the first electromagnetic valve 17 which is a valve and having the other end connected to the second communication hole 25, one end thereof connected to the air tank 31, and the other end connected to the third solenoid valve. And a third conduit 21 connected to the communication hole 26.
[0021]
The first electromagnetic valve 17 is provided in the middle of the first pipeline 19. Reference numeral 15 denotes a first pressure reducing valve. In addition, in the middle of the third pipe 21, a second pressure reducing valve 16, a check valve 27, and a second electromagnetic valve that is a second switching valve are sequentially arranged from one end side (upstream side). 18, a first pressure sensor 22 for detecting a predetermined first set pressure, provided between the second electromagnetic valve 18 and the third communication hole 26, and a second electromagnetic valve 18 and the third communication hole 26, and a second pressure sensor 23 for detecting a second set pressure lower than the first set pressure is provided.
[0022]
The first solenoid valve 17 communicates the first conduit 19 with the atmosphere and the second conduit 20 with the air tank 31, and communicates the first conduit 19 with the air tank 31. In addition, the second solenoid valve 18 can be switched to either the state in which the second pipe line 20 communicates with the atmosphere, and the second solenoid valve 18 has a state in which the third pipe line 21 communicates with the atmosphere. The pipe 21 can be switched to either a state communicating with the air tank 31.
[0023]
As the first and second electromagnetic valves 17 and 18, those conventionally known as shown in FIGS. 3 and 4 can be adopted. The illustrated solenoid valve has first and second through holes 42 and 43 at both ends in the length direction (left and right direction in FIG. 3) of the bottomed cylindrical portion 41 having the hollow portion 40. A third through hole 44 is formed on the opposite side of each through hole 42, 43, and either the first or second through hole 42, 43 is configured by a piston 45 that can be closed. Yes. The rod 46 connected to the piston 45 is pushed and pulled by a solenoid (not shown). In the case of the illustrated example, the second through hole 43 is closed. Accordingly, the first through hole 42 communicates with the third through hole 44 through the hollow portion 40. If the piston rod 46 is moved to the left from the state shown in FIG. 3, the first through hole 42 is closed and the second through hole 43 is opened, and the second through hole 43 is formed in the hollow portion. It communicates with the third through hole 44 through 40.
[0024]
Further, in the case of this embodiment, the pressure of the compressed air sent out from the air tank 31 is 6.5 kg / cm. ² The set pressure of the first pressure reducing valve 15 is 5 kg / cm. ² The set pressure of the second pressure reducing valve 16 is 2 kg / cm. ² It is said. The first pressure sensor 22 has a predetermined first set pressure (for example, 3 kg / cm ² ) Is detected. On the other hand, the second pressure sensor 23 has a second set pressure lower than the first set pressure (for example, 2 kg / cm 2). ² ) Is detected. Each of these pressure sensors 22, 23 has its set pressure (above 3Kg / cm ² And 2Kg / cm ² ) When a value above is detected, a light emitting element such as an LED (not shown) is lit. In the drawings, reference numerals 28a to 28c denote on-off valves, which are normally used in an open state except that they are closed during maintenance work.
[0025]
Since the movable floor fixing device lock cylinder piston state detection device according to this embodiment is configured as described above, the lock device (Cissers) attached to the lifting mechanism of the movable floor 5 (see FIGS. 8 to 10). A state in which the air cylinder piston 14 which is a fluid pressure cylinder piston constituting the lock device corresponds to the locked state of the lock device, a state corresponding to the unlocked state of the lock device, a failure state of the air cylinder piston 14 itself, It is possible to easily detect any of the states. Below, the effect | action at the time of detecting said each state is demonstrated. First, FIG. 1 shows a state of the piston 30 of the air cylinder piston 14 corresponding to a state where the locking device is locked. In this case, the first electromagnetic valve 17 is switched to a state where the first pipe line 19 communicates with the atmosphere and the second pipe line 20 communicates with the air tank 31. Further, the second solenoid valve 18 is switched to a state where the third pipe line 21 communicates with the air tank 31. As a result, the compressed air in the air tank 31 enters the other end of the cylinder tube 9 via the second pipe 20, moves the piston 30, and pulls the rod 10 connected to the piston 30 into the cylinder tube 9. Make it. The air pushed out from one end side of the cylinder tube 9 by the movement of the piston 30 enters the first pipe line 19 through the first communication hole 24 and is sent out to the atmosphere. Further, on the other end side of the cylinder tube 9, the compressed air having a pressure lower than that of the compressed air fed through the second pipe line 20 based on the presence of the second pressure reducing valve 16 is third. However, finally, the compressed air supplied via the second pipe 20 enters the third pipe 21. As a result, the pressure in the third pipe 21 is higher than the set pressure of the first and second pressure sensors 22 and 23, so that the first and second pressure sensors 22 and 23 All the light emitting elements are lit.
[0026]
Thus, by indicating the first detection state in which the first and second pressure sensors 22 and 23 both detect a value equal to or higher than the set pressure, the operator or the like can detect the air cylinder piston 14. It is possible to know that the locking device has reached the locked state. The first and second pressure sensors 22 and 23 are provided at least at the light emitting element at a position where an operator such as a poolside can easily enter and observe.
[0027]
Next, FIG. 2 shows a state in which the locking device is shifted from the locked state to the unlocked state. In this case, the first electromagnetic valve 17 is switched to a state where the first pipe line 19 communicates with the air tank 31 and the second pipe line 20 communicates with the atmosphere. Further, the second solenoid valve 18 is switched to a state where the third pipe line 21 communicates with the air tank 31. As a result, the compressed air in the air tank 31 enters one end side of the cylinder tube 9 via the first pipe line 19 and moves the piston 30 from the position shown by the chain line in FIG. 2 to the position shown by the solid line. The rod 10 connected to 30 is protruded from the cylinder tube 9. At this time, until the final position of the piston 30, the air is discharged from the other end side of the cylinder tube 9 through the second conduit 20 by the movement of the piston 30. When the piston 30 reaches the final position, the piston 30 is in a state of closing the third communication hole 26, so that the pressure in the third pipe 21 is controlled by the second pressure reducing valve 16. The pressure of the compressed air is reduced. For this reason, the light emitting element of the first pressure sensor 22 is not turned on, and only the light emitting element of the second pressure sensor 23 is turned on. In this way, the first pressure sensor 22 has its set pressure (3 kg / cm ² ) Is not detected, and only the second pressure sensor 23 detects the set pressure (above 2 kg / cm ² By indicating the second detection state, the operator can know that the air cylinder piston 14 has reached the unlocking state.
[0028]
Next, an operation of detecting the state when the air cylinder piston 14 is in a failure state when the lock device is changed from the locked state to the unlocked state will be described. In this case, the air cylinder piston 14 is initially in the state (locked state) shown in FIG. From this state, first, as shown in FIG. 5, the second solenoid valve 18 is switched to a state where the third conduit 21 communicates with the atmosphere, and the first and second pressure sensors 22, 23 are turned on. Turn off. Next, the second electromagnetic valve 18 is switched so that the third pipe line 21 communicates with the air tank 31. At this time, the first electromagnetic valve 17 is switched to a state in which the first pipeline 19 communicates with the air tank 31 and the second pipeline 20 communicates with the atmosphere. When the air cylinder piston 14 is operating normally, as described above, the first pressure sensor 22 is turned off and the second pressure sensor 23 is turned on. That is, in this case, if the pressure sensor 22 is operating normally, the pressure sensors 22 and 23 are turned off once, and then only the second pressure sensor 23 is turned on.
[0029]
However, when the air cylinder piston 14 is out of order, the inside of the third pipe 21 communicates with the atmosphere via the third communication hole 26, the second communication hole 25, and the second pipe 20. It becomes a state. As a result, both pressure sensors 22 and 23 remain off. Accordingly, the operator or the like can know that the air cylinder piston 14 has failed by turning off the light emitting elements once from the lighted state and further continuing the light-off state. In this case, the operator or the like inspects and repairs the air cylinder piston 14.
[0030]
Since the detection device according to the present embodiment is configured and operates as described above, it is in a state corresponding to the lock state of the lock device of the air cylinder piston 14 or in the unlock state of the lock device in spite of a simple structure. It is possible to reliably detect the corresponding state, and further, that the air cylinder piston 14 itself is in a failure state. Therefore, the maintenance work of the movable floor pool can be reliably performed. Further, since the various components described above (for example, the first and second electromagnetic valves 17 and 18) can be conventionally known, they can be configured at low cost.
[0031]
By the way, in the embodiment described above, the case where the failure detection of the air cylinder piston 14 is performed only when the lock device shifts from the locked state to the unlocked state has been described. As described above, the failure detection of the air cylinder piston 14 is detected only when the locking device shifts from the locked state to the unlocked state when the locking device is unlocked to move the movable floor 5 up and down. In addition, if the air cylinder piston 14 is broken, the movable floor system may be seriously damaged. On the other hand, when the lock device is shifted from the unlocked state to the locked state, the air cylinder piston 14 This is because even if it breaks down, it will not cause much damage. It should be noted that the failure detection of the air cylinder piston 14 can be performed not only when the locking device is shifted from the locked state to the unlocked state but also when the locking device is shifted from the unlocked state to the locked state. Easy to do.
[0032]
That is, in addition to the configuration of the above-described embodiment, the following configuration is added. A fourth communication hole 50 (see FIG. 5) is provided at a position aligned with the first communication hole 24. Then, a fourth pipe line 51 having one end connected to the air tank 31 and the other end connected to the fourth communication hole 50 is provided. In the middle part of the fourth pipeline 51 is a third switching valve similar to the pressure reducing valve, check valve, and second electromagnetic valve 18 provided in the third pipeline 21 described above. Third and fourth pressure sensors similar to the three solenoid valves and the first and second pressure sensors 22 and 23, respectively, are provided. In other words, a pipe line similar to the third pipe line 21 provided with the members 16, 27, 18, 22, and 23 in the order shown is connected to the fourth communication hole 50. The set pressure of the pressure reducing valve, the third set pressure of the third pressure sensor, and the fourth set pressure of the fourth pressure sensor are respectively the first pressure of the second pressure reducing valve 16 and the first pressure sensor 22. The set pressure is equal to the second set pressure of the second pressure sensor 23. The third solenoid valve can be switched between a state in which the fourth conduit 51 communicates with the atmosphere and a state in which the fourth conduit 51 communicates with the air tank 31. When the lock device is changed from the unlocked state to the locked state, the third and fourth pressure sensors do not detect a value equal to or higher than the set pressure. It is assumed that the cylinder piston 14 is in a failure state.
[0033]
If comprised in this way, the detection of the locked state of a locking device, the detection of the unlocked state of a locking device, and the detection of the failure of the air cylinder piston 14 at the time of a transition from the locked state of a locking device to an unlocked state In addition, it is possible to detect a failure of the air cylinder piston 14 when the locking device shifts from the unlocked state to the locked state.
[0034]
That is, the initial air cylinder piston 14 is in the state (unlocked state) shown in FIG. From this state, first, the third solenoid valve is switched to a state where the fourth conduit 51 communicates with the atmosphere, and the lighting of the third and fourth pressure sensors is turned off. Next, the third electromagnetic valve 18 is switched so that the fourth pipe line 51 communicates with the air tank 31. At this time, as shown in FIG. 1, the first electromagnetic valve 17 is in a state where the first pipe line 19 communicates with the atmosphere and the second pipe line 20 communicates with the air tank 31. When the air cylinder piston 14 is operating normally, the compressed air enters the other end side of the cylinder tube 9 via the second conduit 20 and moves the piston 30 as described above. The rod 10 connected to the piston 30 is pulled into the cylinder tube 9. The air pushed out from one end side of the cylinder tube 9 by the movement of the piston 30 enters the first pipe line 19 through the first communication hole 24 and is sent out to the atmosphere. On the other hand, the pressure in the fourth pipeline 51 is reduced by a third pressure reducing valve (for example, 2 kg / cm ² ) Since the air is sent in, after the piston 30 reaches the final position, the fourth pipe 51 is filled with the decompressed air. As a result, after the light emitting elements of the third and fourth pressure sensors are turned off once, only the light emitting elements of the fourth pressure sensor are turned on. That is, in this case, if the pressure sensor 22 and 23 are operating normally, the pressure sensors 22 and 23 are both turned off and then only the light emitting element of the fourth pressure sensor is turned on.
[0035]
However, if the air cylinder piston 14 is out of order, the first pipe line 19 communicating with the atmosphere communicates with the fourth pipe line 51 via the first communication hole 24 and the fourth communication hole 50. Therefore, after the third and fourth pressure sensors are turned off once, both remain off. Therefore, the operator or the like can know that the air cylinder piston 14 is out of order by observing that all of the light emitting elements remain off. In this case, the operator or the like inspects and repairs the air cylinder piston 14.
[0036]
Although not shown, the detection signals of the pressure sensors 22 and 23 (including the third and fourth pressure sensors when they are provided) can be displayed on the display. In this case, for example, the detection signal is input to a controller (CPU), and the first detection state is locked, the second detection state is unlocked, and the third detection state is a failure state. (When the fourth pipe line is provided, the fourth detection state is also set to the failure state.) Is displayed on the display. If comprised in this way, it will become possible to recognize a detection state still more easily and reliably, it will become possible to know the said locked state, an unlocked state, and a failure state at a glance, and practicality will improve. Further, in the above-described example, the example in which the present invention is applied to the movable floor type pool fixing device has been described. However, the movable floor fixing device locking cylinder piston state detection device according to the present invention is limited to this example. It is not limited to this, and any structure can be applied as long as the structure uses a fluid pressure cylinder piston, such as a movable floor bath or a movable floor bleacher. The fluid pressure cylinder piston is not limited to the air cylinder piston, but includes a conventionally known cylinder piston such as a hydraulic cylinder piston. Furthermore, a plurality of fluid pressure cylinder pistons such as the air cylinder piston can be provided as illustrated in FIG. However, in the case of the structure shown in FIG. 7, it is detected that one of the plurality of fluid pressure cylinder pistons has failed, and a failure of a specific fluid pressure cylinder piston cannot be detected.
[0037]
【The invention's effect】
Since the movable floor fixing device locking cylinder piston state detection device according to the present invention is configured and operates as described above, the fluid pressure cylinder piston corresponds to the locking device locking state or the unlocking state. In addition, it can be reliably detected that at least one of the fluid pressure cylinders is in a failure state. Therefore, the maintenance work of the fixing device attached to the movable floor can be reliably performed. And since it can be comprised simply, manufacturing cost can be restrained low and it has a big effect practically.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of the present invention in a locked state.
FIG. 2 is a schematic diagram showing an embodiment of the present invention in an unlocked state.
FIG. 3 is a half sectional view schematically showing the structure of the first and second electromagnetic valves.
FIG. 4 is a view of FIG. 3 as viewed from the left.
FIG. 5 is a view similar to FIG. 1, showing a state of the second solenoid valve when switching between the locked state and the unlocked state, with a part omitted.
FIG. 6 is a schematic diagram showing a state when a fluid pressure cylinder piston fails when the embodiment of the present invention is changed from the locked state to the unlocked state.
FIG. 7 is a schematic view showing an example in which a plurality of air cylinder pistons are provided.
FIG. 8 is a schematic vertical side view showing a conventional pneumatic lifting device for a movable pool floor.
FIG. 9 is a schematic longitudinal side view showing a lifting arm attached to the lifting means.
FIG. 10 is a schematic front view of the same.
FIG. 11 is a partially longitudinal side view showing a connecting portion between the lifting arm and the air cylinder.
[Explanation of symbols]
1 pool
2 fixed floor
3 Pneumatic feed path
4 Bellows-type support
5 movable floor
6 Compressor
7 Air cylinder
8 Lifting arm
9 Cylinder cylinder
10 Rod
11 First arm
12 Second arm
13 Kikuza
14 Air cylinder
15 First pressure reducing valve
16 Second pressure reducing valve
17 First solenoid valve
18 Second solenoid valve
19 First pipeline
20 Second pipeline
21 Third pipeline
22 First pressure sensor
23 Second pressure sensor
24 First communication hole
25 Second communication hole
26 Third communication hole
27 Check valve
28a, 28b, 28c On-off valve
30 piston
31 Air tank

Claims (6)

The fluid pressure cylinder piston provided in the fixing device attached to the movable floor which can be moved up and down is either in a state corresponding to the locked state of the fixing device, a state corresponding to the unlocked state of the fixing device, or a failure state. A movable floor fixing device for detecting whether or not the state is a cylinder piston state detection device for locking,
On one end side of the cylinder cylinder constituting the fluid pressure cylinder piston, a first communication hole formed on one end side further than the position of the piston at the time of locking, one end thereof is connected to the fluid reservoir, and the other end is The first pipe connected to the first communication hole, the first switching valve provided in the middle of the first pipe, and the other end in the cylinder that forms the fluid pressure cylinder piston Then, the second communication hole formed on the other end side further than the position of the piston when unlocked, one end thereof was connected to the first switching valve, and the other end was connected to the second communication hole. A second pipe, a third communication hole provided on the other end side of the cylinder tube, a third communication hole having one end connected to the fluid reservoir and the other end connected to the third communication hole , A pressure reducing valve provided in the middle of the third pipe, and the intermediate A check valve provided on the other end side of the pressure reducing valve, a second switching valve provided on the other end side of the check valve at the intermediate portion, the second switching valve, and the A first pressure sensor that is provided between the third communication hole and detects a predetermined first set pressure, and is also provided between the second switching valve and the third communication hole. A second pressure sensor for detecting a second set pressure lower than the first set pressure,
The first switching valve communicates the first conduit to the atmosphere and communicates the second conduit to the fluid reservoir, and communicates the first conduit to the fluid reservoir and the second The second switching valve can be switched to either a state in which the pipe communicates with the atmosphere, and the second switching valve communicates with the atmosphere in the third pipe and the fluid storage section. It can be switched to either the state of communication,
When the first and second pressure sensors both detect a value equal to or higher than the set pressure when locking the fixing device, the fluid pressure cylinder piston indicates the fixing device. Suppose you reach a locked state,
When the fixing device is shifted to the unlocked state, the first pressure sensor does not detect a value equal to or higher than the set pressure, and only the second pressure sensor detects a value equal to or higher than the set pressure. When the fluid pressure cylinder piston has reached the unlocking state,
When the fixing device is changed from the locked state to the unlocked state, when the first and second pressure sensors do not detect a value equal to or higher than the set pressure, the fluid pressure cylinder The piston is assumed to be in a failure state,
A movable floor fixing device lock cylinder piston state detection device. A fourth communication hole provided at the same position as the first communication hole, a fourth pipe line having one end connected to the fluid reservoir and the other end connected to the fourth communication hole; A pressure reducing valve provided at an intermediate portion of the fourth pipe line, a check valve provided at the other end side of the intermediate portion with respect to the pressure reducing valve, and other than the check valve at the intermediate portion. A third switching valve provided on the end side, a third pressure sensor provided between the third switching valve and the fourth communication hole, for detecting a predetermined third set pressure; A fourth pressure sensor for detecting a fourth set pressure lower than the third set pressure, also provided between the third switching valve and the fourth communication hole,
The third switching valve is freely switchable between a state in which the fourth conduit is communicated with the atmosphere and a state in which the fourth conduit is communicated with the fluid reservoir.
When the fixing device is changed from the unlocked state to the locked state, the third and fourth pressure sensors do not detect a value equal to or higher than the set pressure. 2. The state detecting device for a cylinder piston for locking a movable floor fixing device according to claim 1, wherein the piston is in a failure state. 2. The notification means according to claim 1, wherein the first detection state is a locked state, the second detection state is an unlock state, and the third detection state is a failure state. The state detection apparatus of the cylinder piston for a movable floor fixing device lock of description. The first detection state is a locked state, the second detection state is an unlocked state, and each of the third and fourth detection states is a failure state. The state detection apparatus of the cylinder piston for a movable floor fixing apparatus lock of Claim 2. The state detection device for a cylinder piston for locking a movable floor fixing device according to any one of claims 3 to 4, wherein the notification means is a display device. The state detection device for a movable floor fixing device locking cylinder piston according to any one of claims 3 to 4, wherein the notification means is a light emitting element.

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