JP4952572B2 - Hydraulic elevator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a hydraulic elevator device enabling back-up of safety even when a fault is detected by maintenance inspection, by adding a closing function at over speeding to a pressure holding valve. <P>SOLUTION: The hydraulic elevator device comprises the pressure holding valve 12 disposed near a hydraulic jack 5, connecting a power unit 10 side and a hydraulic jack side through an opening/closing valve 13 changing opening/closing amount according to a flow rate of hydraulic oil, decreasing lift amount when the flow rate is small and increasing the lift amount when the flow rate is large; an solenoid valve 15 provided in a passage connecting a back pressure chamber of the opening/closing valve and the power unit side, and excited when a lowering instruction is issued; a fixed throttle 18 provided between the back pressure chamber of the opening/closing valve and the power unit side; a connecting rod 23 provided on the opening/closing valve, and pushed up by a flow of the hydraulic oil from the back pressure chamber of the opening/closing chamber; and a pilot blocking means preventing the outflow of the hydraulic oil from the back pressure chamber of the opening/closing valve by interlocking at pushing-up of the connecting rod, and closing the opening/closing valve by the hydraulic oil on the hydraulic jack side from the fixed throttle. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a hydraulic elevator apparatus including a pressure holding valve in the vicinity of a hydraulic jack.

  In a conventional hydraulic elevator apparatus, a pressure holding valve is provided in the vicinity of the hydraulic jack in order to reduce the ups and downs generated in the car when passengers get on and off. Providing a pressure holding valve in the vicinity of the hydraulic jack reduces the ups and downs of passengers when getting on and off the car, and even if oil leaks from the hydraulic piping, the car is held at the stop position without lowering (For example, refer to Patent Document 1).

FIG. 10 is an overall configuration diagram showing a conventional hydraulic elevator apparatus. In FIG. 10, 1 is a passenger car, 2 is a rope, 3 is a sheave, 4 is a plunger, 5 is a hydraulic jack, 6 is a hydraulic pipe, 7 is a control valve, 8 is a pump, 9 is a motor, 10 is a control valve 7 , A power unit incorporating the pump 8 and the motor 9, 11 a stop valve provided near the power unit 10 of the hydraulic pipe 6, 12 a pressure holding valve arranged near the hydraulic jack 5 of the hydraulic pipe 6, and 13 a pressure On-off valve of the holding valve 12, 14 is a push spring of the pressure holding valve 12, 15 is a normally closed electromagnetic valve, 16 is a check valve, 18 is a fixed throttle, 19 is a back pressure chamber of the pressure holding valve 12, and 22 is Manual open / close valve.
When the car 1 is raised, the pressure oil sent from the power unit 10 flows through the hydraulic pipe 6 to the hydraulic jack 5 and pushes up the car 1. When the car 1 is lowered, the pressure oil in the hydraulic jack 5 is pushed back by its own weight and is returned to the power unit 10. At this time, an ascent / descent command is issued from the control panel in response to a call from the passenger. The pressure holding valve 12 is disposed on the hydraulic piping 6 path between the power unit 10 and the hydraulic jack 5 and in the vicinity of the hydraulic jack 5, and when the car 1 is lifted, the on-off valve 13 is pressed by the pressure oil from the power unit 10. A normally closed solenoid valve that opens by overcoming the force of pressing the on-off valve 13 due to the jack spring pressure of the push spring 14 and the back pressure chamber 19 and is excited in synchronization with the lowering command from the control panel when the car 1 is lowered. When 15 is excited, the pressure in the back pressure chamber 19 decreases, and a force for opening the on-off valve 13 is generated.

Conventional hydraulic elevators were also equipped with a fall prevention device, but mainly used to prevent the fall due to rope breakage during normal lifting operation. In the case of hydraulic elevators, the possibility of car drop due to hydraulic system failure and oil leakage from hydraulic pipes and joints is extremely low, so it operates when the rope is called slack rope type emergency stop when it breaks or relaxes. Application of the device is permitted.
However, in recent years, when the free arrangement of the machine room, which is a merit of the hydraulic elevator, has been widely adopted, there are not many cases where the hydraulic piping is placed under rusting and corrosion environments such as outdoors. It has become like this. Even in such cases, safety must be ensured in principle by regular maintenance work. However, if hydraulic pipes or their joints corrode significantly and oil leaks from them, the worst way is that the car can be lowered indefinitely with the door open. There are places where this cannot be completely prevented.

JP 11-322207 A

  In the conventional hydraulic elevator apparatus, the safety against overspeed is required to be installed as an emergency stop with a speed governor, or a separate safety device such as a rupture valve is required, which increases the cost.

  The present invention has been made to solve the above-described problems. By adding a closing function at the time of overspeed to the pressure holding valve, the common valve is used to hold the pressure and lower the elevator. The present invention provides a hydraulic elevator apparatus configured to ensure safety against overspeed and to be able to back up safety even in the event of a failure in maintenance inspection, which is a human task.

  In the hydraulic elevator apparatus according to the present invention, when the car is raised, the hydraulic oil sent from the power unit flows through the hydraulic piping to the hydraulic jack and pushes up the car. When the car is lowered, the hydraulic jack is driven by the weight of the car. The hydraulic fluid inside is pushed back and returned to the power unit. The opening / closing amount of the on / off valve automatically changes depending on the flow rate of the hydraulic oil, and the pressure holding valve has the characteristic that the lift amount of the on / off valve is small when the flow rate is small and the lift amount is large when the flow rate is large, Provided in the passage connecting the back pressure chamber of the holding valve on / off valve and the power unit side, and when a lowering command is issued to the car A normally closed solenoid valve that is excited only, a fixed throttle provided between the back pressure chamber of the on-off valve of the pressure holding valve and the hydraulic piping on the hydraulic jack side, and an on-off valve of the pressure holding valve, The connecting rod that is pushed up when the lowering speed of the car exceeds due to oil leaks such as pipe rupture, and the hydraulic oil flows out from the back pressure chamber of the on-off valve of the pressure holding valve in conjunction with the pushing up of the connecting rod. Pilot closing means for blocking and closing the on-off valve with hydraulic oil on the hydraulic jack side from the fixed throttle is provided.

  According to the present invention, by adding a closing function at the time of overspeed to the pressure holding valve, a common valve is used to ensure safety against pressure holding and overspeed of the elevator, and for human work. Even if there is a defect in a certain maintenance inspection, the product can be backed up by safety, so there is an effect that it is possible to guarantee more safety than before even in the event of a power failure or valve failure.

Embodiment 1 FIG.
1 is an overall configuration diagram showing a hydraulic elevator apparatus according to Embodiment 1 of the present invention, FIG. 2 is a main configuration diagram showing a state of a hydraulic elevator apparatus according to Embodiment 1 of the present invention when a car is stopped, and FIG. FIG. 2 is a view corresponding to FIG. 2 showing the state of the hydraulic elevator apparatus in the first embodiment of the present invention when the car is raised, and FIG. 4 is a view corresponding to FIG. 2 showing the state of the hydraulic elevator apparatus in the first embodiment of the present invention when the car is lowered. FIG. 5 is a view corresponding to FIG. 2 showing a state when the piping of the hydraulic elevator apparatus in the first embodiment of the present invention is damaged (oil leakage), and FIG. 6 explains the operation of the hydraulic elevator apparatus in the first embodiment of the present invention. It is a time chart for doing.

1 and 2, 1 is a passenger car, 2 is a rope, 3 is a sheave, 4 is a plunger, 5 is a hydraulic jack, 6 is a hydraulic pipe, 7 is a control valve, 8 is a pump, 9 is a motor, 10 is The control unit 7 includes a control valve 7, a pump 8, and a motor 9, 11 is a stop valve provided in the vicinity of the power unit 10 of the hydraulic pipe 6, and 12 is a hydraulic pipe 6 path connecting the power unit 10 and the hydraulic jack 5. A pressure holding valve disposed in the vicinity of the hydraulic jack 5, 13 is an on-off valve of the pressure holding valve 12, 14 is a push spring of the on-off valve 13, 15 is a normally closed solenoid valve, 16 is a check valve, and 18 is fixed. A throttle 19 is a back pressure chamber of the pressure holding valve 12. The electromagnetic valve 15 is provided between the back pressure chamber 19 of the on-off valve 13 of the pressure holding valve 12 and the hydraulic pipe 6 between the control valve 7 and the on-off valve 14 of the power unit 10. It is provided between the electromagnetic valve 15 and the back pressure chamber 19. The fixed throttle 18 is provided between the back pressure chamber 19 of the on-off valve 13 of the pressure holding valve 12 and the hydraulic pipe 6 between the hydraulic jack 5 and the on-off valve 13. A manual open / close valve 22 is provided between the check valve 16 and the hydraulic pipe 6 and is provided on the bypass path of the electromagnetic valve 15. The manual on-off valve 22 is normally closed, and is opened when, for example, the electromagnetic valve 15 fails and the car 1 cannot be lowered without opening the valve. This is a time when the car 1 is lowered by opening the manual on-off valve 22 and flowing hydraulic oil on the hydraulic jack 5 side to the power unit 10 side. A connecting rod 23 is inserted into a lid 12a fixed to the upper end of the pressure holding valve 12 so as to be slidable in the thrust direction by a cylindrical sleeve 24. The open / close valve 13 is lifted at the rated speed of the hydraulic elevator. When the speed exceeds the lift amount, the back of the on-off valve 13 and the lower end of the connecting rod 23 are brought into contact and pushed up. In addition, the connecting rod 23 needs to be adjusted in advance at a point where a malfunction does not occur in consideration of a change in the lift amount due to the hydraulic oil viscosity when the oil amount changes. Reference numeral 25 denotes a self-holding pilot closing valve that is interlocked with the connecting rod 23 and is provided between the solenoid valve 15 and the check valve 16. When the speed of the hydraulic elevator is exceeded, the lift amount of the on-off valve 13 increases, and the connecting rod 23 is pushed up. Thereby, the pilot close valve 25 interlocked with the connecting rod 23 is closed soon.
The safety valve having a combination of the on-off valve 13 and the pilot shut-off valve 25 is installed in the vicinity of the hydraulic jack 5. The reason is that if the hydraulic jack part and the safety valve part are separated from each other, This is because there is no means for stopping the lowering of the car 1 when there is oil leakage in the pipe. Therefore, in order to minimize the risk of oil leakage from the piping, a safety valve is provided in the vicinity of the hydraulic jack so that the piping length between the hydraulic jack portion and the safety valve is minimized. FIG. 2 shows a car stop state during normal operation.

  FIG. 3 shows the car ascending state during normal operation. When the car is raised, the solenoid valve 15 is not coil-excited, and the pressure oil in the back pressure chamber 19 of the on-off valve 13 passes through the fixed throttle 18 and escapes to the hydraulic jack 5 side. The on-off valve 13 is pushed up by the hydraulic oil flowing out from the power unit 10 side, and the hydraulic oil flows to the hydraulic jack 5 side. When the car is raised, the on-off valve 13 is set so as not to push up the connecting rod 23. Since the pump pressure from the power unit 10 side is higher than the hydraulic jack pressure, the on-off valve 13 is configured to automatically open. Even if the pilot shut-off valve 25 is closed due to an excessive flow rate, the operation is not affected. In the case of a hydraulic elevator, the hydraulic oil flow rate cannot exceed the number of revolutions of the pump, so this is not a dangerous operation.

  FIG. 4 shows the car descending state during normal operation. When the car descends, the solenoid valve 15 is coil-excited. The hydraulic oil on the hydraulic jack 5 side pushes up the on-off valve 13 and flows from the on-off valve 13 to the power unit 10 side, and also flows from the electromagnetic valve 15 to the power unit 10 side via the check valve 16. The opening / closing valve 13 is set so as not to push up the connecting rod 23 even when the car is lowered.

FIG. 5 a shows a state before the on-off valve 13 is closed when there is crack damage or the like in the piping on the power unit 10 side and oil leaks, for example. Further, FIG. 5b shows a state in which the pilot closing valve 25 is operated and the on-off valve 13 is closed after the state of FIG. 5a. When the car 1 suddenly descends (overspeed) at a speed exceeding the rated speed regardless of the operation control system due to the rupture damage of the piping or due to an accident such as a valve failure, the on-off valve 13 The connecting rod 23 is pushed up to operate the pilot shut-off valve 25, and the hydraulic fluid to the solenoid valve 15 side is stopped. At this time, the on-off valve 13 is lowered as shown in FIG. 5b, and the pilot close valve 25 is kept closed as shown in FIG. 5b, and the car 1 is lowered again. Is preventing. 5a and 5b show the case where the electromagnetic valve 15 is excited. For example, even when the electromagnetic valve 15 is not excited when the car 1 is raised, the opening and closing valve 13 is used as described above. The pilot closing valve 25 is operated.
In rare cases, the engine is operated at an overspeed exceeding the rated speed due to a hydraulic fluid spill or an accident such as a valve failure. At this time, when the pilot shut-off valve 25 closes due to the increase of the on-off valve lift due to the excess of hydraulic oil → the connecting rod 23 is pushed up, the pressure oil in the back pressure chamber 19 of the on-off valve 13 loses its escape location, and the fixed throttle 18 In this state, the pressure oil on the hydraulic jack 5 side that passes through the cylinder only enters. When descending, the hydraulic jack pressure is higher than the pressure on the power unit 10 side, so the on-off valve 13 is immediately closed. When the on-off valve 13 is turned from the increase of the lift amount and starts to close, the force that pushes up the connecting rod 23 does not act, so the self-holding type pilot shut-off valve 25 holds itself so as not to be pushed back by the spring. It is configured to keep the closed state.

Next, the operation of the hydraulic elevator apparatus will be described with reference to FIG.
As shown in FIG. 6, the normally closed solenoid valve 15 is not excited when the car 1 is raised, and the normally closed solenoid valve 15 is excited when the car 1 is lowered. As a result, the flow resistance of the pilot circuit is minimized when ascending, and the pilot circuit is closed when descending, whereby both conditions can be easily satisfied, the response of the on-off valve 13 is increased, and the riding comfort is improved. .
That is, since the on-off valve 13 is automatically opened by the pressure from the pump 8 at the time of starting up, it is necessary to quickly release the pressure of the back pressure chamber 19 of the on-off valve 13 to the jack side. On the other hand, when descending, the solenoid valve 15 is excited. Then, the solenoid valve 15 opens. Thereby, the pressure oil in the back pressure chamber 19 passes through the electromagnetic valve 15 and flows into the control valve 7 side. The on-off valve 13 is opened by the balance between the jack pressure and the back pressure across the on-off valve 13.

  With the configuration of the conventional hydraulic elevator, when the lowering command is generated by the elevator control panel, the coil is in an excited state, so that the car cannot be stopped when the speed is exceeded. Therefore, in the prior art, it was necessary to provide a rupture valve or an emergency stop with a governor. The on-off valve 13 opens and closes correspondingly to the flow rate of the hydraulic oil in both the flow of hydraulic oil when rising (power unit side → hydraulic jack side) and the flow of hydraulic oil when descending (hydraulic jack side → power unit side). It is known to be an area. That is, when the flow rate is large, the on-off valve lift amount is large, and when the flow rate is small, the on-off valve lift amount is small. If this property is used, the flow rate of hydraulic oil can be checked by detecting the lift amount, and the present invention can be realized.

Embodiment 2. FIG.
FIG. 7 is a main part configuration diagram showing a state when the car is stopped in the hydraulic elevator apparatus according to Embodiment 2 of the present invention. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, the pilot close valve 25 that is linked to the connecting rod 23 is provided between the electromagnetic valve 15 and the check valve 16. However, in the second embodiment, the pilot close valve 25 is not an electric valve. A normally closed switch 26 is provided. That is, as shown in FIG. 7, 26 is a normally closed switch connected to the coil excitation signal input 27 of the solenoid valve 15 by the electric wire 28, and is broken (opened) when the connecting rod 23 is pushed up.

  Since the coil is excited and opened only when the car 1 descends in a controlled manner, the solenoid valve 15 is closed if the power supply to the coil of the solenoid valve 15 is interrupted by the normally closed switch 26. Therefore, the coil of the solenoid valve 15 that is energized during the descent in the normal operation increases the lift amount of the on-off valve 13 due to excess hydraulic oil flow, pushes up the connecting rod 23, and breaks (opens) the normally closed switch 26. As a result, the power supply to the coil of the electromagnetic valve 15 is cut off, and the electromagnetic valve 15 is closed. For this reason, the pressure oil in the back pressure chamber 19 loses its escape, and only the pressure oil on the hydraulic jack 5 side passing through the fixed throttle 18 flows in. When the car 1 is lowered, the hydraulic jack pressure is higher than the pressure on the power unit side, so the on-off valve 13 is immediately closed. The electrical normally closed switch 26 is a self-holding type, and once a break occurs, the break state is maintained unless it is manually operated from the outside.

Embodiment 3 FIG.
FIG. 8 is a main part configuration diagram showing a state in which the flow of hydraulic oil is stopped due to occurrence of piping oil leakage or the like of the hydraulic elevator apparatus according to Embodiment 3 of the present invention, and FIG. 9 shows piping oil leakage from the state of FIG. It is the elements on larger scale which show a part of return operation | movement which completes restoration and restarts driving | operation. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the second embodiment, a reset button 30 is added to the pilot closing valve 25 interlocked with the connecting rod 23 so that the self-held pilot closing valve 25 can be manually returned. That is, FIG. 8 shows a state in which the on-off valve 13 pushes up the connecting rod 23 and the pilot shut-off valve 25 is operated to stop the flow of hydraulic oil. At this time, the reset button 30 is also linked to the connecting rod 23. And pushed up. Thereafter, for example, when restoration of piping oil leakage or the like is completed and the operation is restarted, the pilot close valve 25 and the connecting rod 23 are brought into a normal state by manually depressing the reset button 30 as shown in FIG. Can be restored.

1 is an overall configuration diagram showing a hydraulic elevator apparatus according to Embodiment 1 of the present invention. It is a principal part block diagram which shows the mode at the time of the cage | basket | car stop of the hydraulic elevator apparatus in Embodiment 1 of this invention. FIG. 3 is a view corresponding to FIG. 2 and illustrating a state when the car is raised in the hydraulic elevator apparatus according to Embodiment 1 of the present invention. FIG. 3 is a view corresponding to FIG. 2 and illustrating a state when the car is lowered in the hydraulic elevator apparatus according to Embodiment 1 of the present invention. FIG. 3 is a view corresponding to FIG. 2 and showing a state before the on-off valve is closed when the piping of the hydraulic elevator apparatus in the first embodiment of the present invention is damaged (oil leakage). FIG. 3 is a view corresponding to FIG. 2 and showing a state when the on-off valve is closed when the piping of the hydraulic elevator apparatus according to Embodiment 1 of the present invention is damaged (oil leakage). It is a time chart for demonstrating operation | movement of the hydraulic elevator apparatus in Embodiment 1 of this invention. It is a principal part block diagram which shows the mode at the time of the cage | basket | car stop of the hydraulic elevator apparatus in Embodiment 2 of this invention. It is a principal part block diagram which shows the state by which the flow of hydraulic fluid was stopped by the piping oil leak generation | occurrence | production, etc. of the hydraulic elevator apparatus in Embodiment 3 of this invention. It is the elements on larger scale which show a part of reset operation | movement which complete | finishes repairs, such as piping oil leakage, from the state of FIG. 8, and restarts driving | operation. It is a whole block diagram which shows the conventional hydraulic elevator apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car 2 Rope 3 Sheave 4 Plunger 5 Hydraulic jack 6 Hydraulic piping 7 Control valve 8 Pump 9 Motor 10 Power unit 11 Stop valve 12 Pressure holding valve 13 On-off valve 14 Push spring 15 Normally closed solenoid valve 16 Check valve 18 Fixed throttle 19 Back pressure chamber 22 Manual open / close valve 23 Connecting rod 24 Sleeve 25 Pilot close valve 26 Normally closed switch 27 Coil excitation signal input 28 Electric wire 30 Reset button

Claims (4)

When the car rises, the hydraulic oil sent from the power unit flows through the hydraulic piping to the hydraulic jack and pushes up the car, and when the car descends, the hydraulic oil in the hydraulic jack is pushed back by the weight of the car to the power unit. In the hydraulic elevator system for reflux,
The hydraulic unit is disposed on a hydraulic piping path connecting the power unit and the hydraulic jack and in the vicinity of the hydraulic jack, and connects the power unit side and the hydraulic jack side via an on-off valve. The pressure holding valve has the characteristic that the opening / closing amount changes automatically, the lift amount of the opening / closing valve is small when the flow rate is small, and the lift amount increases when the flow rate is large,
A normally closed solenoid valve which is provided in a passage connecting the back pressure chamber of the on-off valve of the pressure holding valve and the power unit side and is excited only when a lowering command is issued to the car;
A fixed throttle provided between the back pressure chamber of the on-off valve of the pressure holding valve and the hydraulic piping on the hydraulic jack side;
A connecting rod which is provided on the on-off valve of the pressure holding valve and is pushed up when the lowering speed of the car exceeds due to oil leakage such as pipe rupture;
A pilot that interlocks when the connecting rod is pushed up to prevent the hydraulic oil from flowing out from the back pressure chamber of the on-off valve of the pressure holding valve and closes the on-off valve by hydraulic oil on the hydraulic jack side from the fixed throttle Closing means;
A hydraulic elevator apparatus comprising:   The pilot closing means is a self-holding pilot closing valve that is provided between the electromagnetic valve and the back pressure chamber of the on-off valve of the pressure holding valve, and closes in conjunction with the connecting rod being pushed up. The hydraulic elevator apparatus according to claim 1.   The hydraulic elevator apparatus according to claim 2, wherein the self-holding type pilot shut-off valve has a reset button for manual return.   2. The hydraulic elevator apparatus according to claim 1, wherein the pilot closing means is a self-holding type switch provided in a coil excitation circuit of the solenoid valve and opened in conjunction with the connecting rod being pushed up.

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